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linux/drivers/usb/dwc2/gadget.c
Greg Kroah-Hartman 45dd7af410 usb: changes for v4.19 
Not a big pull request with only 37 non-merge commits, most of which
 are touching dwc2 (74% of the changes).
 
 The most important changes are dwc2's support for uframe scheduling
 and its endian-agnostic readl/writel wrappers.
 
 From dwc3 side we have a special new glue layer for Synopsys HAPS
 which will help Synopsys running FPGA validation using our upstream
 driver. We also have the beginnings of dual-role support for Intel
 Merrifield platform.
 
 Apart from these, just a series of non-critical changes.
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Merge tag 'usb-for-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next

Felipe writes:

usb: changes for v4.19

Not a big pull request with only 37 non-merge commits, most of which
are touching dwc2 (74% of the changes).

The most important changes are dwc2's support for uframe scheduling
and its endian-agnostic readl/writel wrappers.

From dwc3 side we have a special new glue layer for Synopsys HAPS
which will help Synopsys running FPGA validation using our upstream
driver. We also have the beginnings of dual-role support for Intel
Merrifield platform.

Apart from these, just a series of non-critical changes.
2018-07-30 10:21:14 +02:00

5124 lines
132 KiB
C
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C USB2.0 High-speed / OtG driver
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of_platform.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/phy.h>
#include "core.h"
#include "hw.h"
/* conversion functions */
static inline struct dwc2_hsotg_req *our_req(struct usb_request *req)
{
return container_of(req, struct dwc2_hsotg_req, req);
}
static inline struct dwc2_hsotg_ep *our_ep(struct usb_ep *ep)
{
return container_of(ep, struct dwc2_hsotg_ep, ep);
}
static inline struct dwc2_hsotg *to_hsotg(struct usb_gadget *gadget)
{
return container_of(gadget, struct dwc2_hsotg, gadget);
}
static inline void dwc2_set_bit(struct dwc2_hsotg *hsotg, u32 offset, u32 val)
{
dwc2_writel(hsotg, dwc2_readl(hsotg, offset) | val, offset);
}
static inline void dwc2_clear_bit(struct dwc2_hsotg *hsotg, u32 offset, u32 val)
{
dwc2_writel(hsotg, dwc2_readl(hsotg, offset) & ~val, offset);
}
static inline struct dwc2_hsotg_ep *index_to_ep(struct dwc2_hsotg *hsotg,
u32 ep_index, u32 dir_in)
{
if (dir_in)
return hsotg->eps_in[ep_index];
else
return hsotg->eps_out[ep_index];
}
/* forward declaration of functions */
static void dwc2_hsotg_dump(struct dwc2_hsotg *hsotg);
/**
* using_dma - return the DMA status of the driver.
* @hsotg: The driver state.
*
* Return true if we're using DMA.
*
* Currently, we have the DMA support code worked into everywhere
* that needs it, but the AMBA DMA implementation in the hardware can
* only DMA from 32bit aligned addresses. This means that gadgets such
* as the CDC Ethernet cannot work as they often pass packets which are
* not 32bit aligned.
*
* Unfortunately the choice to use DMA or not is global to the controller
* and seems to be only settable when the controller is being put through
* a core reset. This means we either need to fix the gadgets to take
* account of DMA alignment, or add bounce buffers (yuerk).
*
* g_using_dma is set depending on dts flag.
*/
static inline bool using_dma(struct dwc2_hsotg *hsotg)
{
return hsotg->params.g_dma;
}
/*
* using_desc_dma - return the descriptor DMA status of the driver.
* @hsotg: The driver state.
*
* Return true if we're using descriptor DMA.
*/
static inline bool using_desc_dma(struct dwc2_hsotg *hsotg)
{
return hsotg->params.g_dma_desc;
}
/**
* dwc2_gadget_incr_frame_num - Increments the targeted frame number.
* @hs_ep: The endpoint
*
* This function will also check if the frame number overruns DSTS_SOFFN_LIMIT.
* If an overrun occurs it will wrap the value and set the frame_overrun flag.
*/
static inline void dwc2_gadget_incr_frame_num(struct dwc2_hsotg_ep *hs_ep)
{
hs_ep->target_frame += hs_ep->interval;
if (hs_ep->target_frame > DSTS_SOFFN_LIMIT) {
hs_ep->frame_overrun = true;
hs_ep->target_frame &= DSTS_SOFFN_LIMIT;
} else {
hs_ep->frame_overrun = false;
}
}
/**
* dwc2_hsotg_en_gsint - enable one or more of the general interrupt
* @hsotg: The device state
* @ints: A bitmask of the interrupts to enable
*/
static void dwc2_hsotg_en_gsint(struct dwc2_hsotg *hsotg, u32 ints)
{
u32 gsintmsk = dwc2_readl(hsotg, GINTMSK);
u32 new_gsintmsk;
new_gsintmsk = gsintmsk | ints;
if (new_gsintmsk != gsintmsk) {
dev_dbg(hsotg->dev, "gsintmsk now 0x%08x\n", new_gsintmsk);
dwc2_writel(hsotg, new_gsintmsk, GINTMSK);
}
}
/**
* dwc2_hsotg_disable_gsint - disable one or more of the general interrupt
* @hsotg: The device state
* @ints: A bitmask of the interrupts to enable
*/
static void dwc2_hsotg_disable_gsint(struct dwc2_hsotg *hsotg, u32 ints)
{
u32 gsintmsk = dwc2_readl(hsotg, GINTMSK);
u32 new_gsintmsk;
new_gsintmsk = gsintmsk & ~ints;
if (new_gsintmsk != gsintmsk)
dwc2_writel(hsotg, new_gsintmsk, GINTMSK);
}
/**
* dwc2_hsotg_ctrl_epint - enable/disable an endpoint irq
* @hsotg: The device state
* @ep: The endpoint index
* @dir_in: True if direction is in.
* @en: The enable value, true to enable
*
* Set or clear the mask for an individual endpoint's interrupt
* request.
*/
static void dwc2_hsotg_ctrl_epint(struct dwc2_hsotg *hsotg,
unsigned int ep, unsigned int dir_in,
unsigned int en)
{
unsigned long flags;
u32 bit = 1 << ep;
u32 daint;
if (!dir_in)
bit <<= 16;
local_irq_save(flags);
daint = dwc2_readl(hsotg, DAINTMSK);
if (en)
daint |= bit;
else
daint &= ~bit;
dwc2_writel(hsotg, daint, DAINTMSK);
local_irq_restore(flags);
}
/**
* dwc2_hsotg_tx_fifo_count - return count of TX FIFOs in device mode
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_hsotg_tx_fifo_count(struct dwc2_hsotg *hsotg)
{
if (hsotg->hw_params.en_multiple_tx_fifo)
/* In dedicated FIFO mode we need count of IN EPs */
return hsotg->hw_params.num_dev_in_eps;
else
/* In shared FIFO mode we need count of Periodic IN EPs */
return hsotg->hw_params.num_dev_perio_in_ep;
}
/**
* dwc2_hsotg_tx_fifo_total_depth - return total FIFO depth available for
* device mode TX FIFOs
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_hsotg_tx_fifo_total_depth(struct dwc2_hsotg *hsotg)
{
int addr;
int tx_addr_max;
u32 np_tx_fifo_size;
np_tx_fifo_size = min_t(u32, hsotg->hw_params.dev_nperio_tx_fifo_size,
hsotg->params.g_np_tx_fifo_size);
/* Get Endpoint Info Control block size in DWORDs. */
tx_addr_max = hsotg->hw_params.total_fifo_size;
addr = hsotg->params.g_rx_fifo_size + np_tx_fifo_size;
if (tx_addr_max <= addr)
return 0;
return tx_addr_max - addr;
}
/**
* dwc2_hsotg_tx_fifo_average_depth - returns average depth of device mode
* TX FIFOs
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_hsotg_tx_fifo_average_depth(struct dwc2_hsotg *hsotg)
{
int tx_fifo_count;
int tx_fifo_depth;
tx_fifo_depth = dwc2_hsotg_tx_fifo_total_depth(hsotg);
tx_fifo_count = dwc2_hsotg_tx_fifo_count(hsotg);
if (!tx_fifo_count)
return tx_fifo_depth;
else
return tx_fifo_depth / tx_fifo_count;
}
/**
* dwc2_hsotg_init_fifo - initialise non-periodic FIFOs
* @hsotg: The device instance.
*/
static void dwc2_hsotg_init_fifo(struct dwc2_hsotg *hsotg)
{
unsigned int ep;
unsigned int addr;
int timeout;
u32 val;
u32 *txfsz = hsotg->params.g_tx_fifo_size;
/* Reset fifo map if not correctly cleared during previous session */
WARN_ON(hsotg->fifo_map);
hsotg->fifo_map = 0;
/* set RX/NPTX FIFO sizes */
dwc2_writel(hsotg, hsotg->params.g_rx_fifo_size, GRXFSIZ);
dwc2_writel(hsotg, (hsotg->params.g_rx_fifo_size <<
FIFOSIZE_STARTADDR_SHIFT) |
(hsotg->params.g_np_tx_fifo_size << FIFOSIZE_DEPTH_SHIFT),
GNPTXFSIZ);
/*
* arange all the rest of the TX FIFOs, as some versions of this
* block have overlapping default addresses. This also ensures
* that if the settings have been changed, then they are set to
* known values.
*/
/* start at the end of the GNPTXFSIZ, rounded up */
addr = hsotg->params.g_rx_fifo_size + hsotg->params.g_np_tx_fifo_size;
/*
* Configure fifos sizes from provided configuration and assign
* them to endpoints dynamically according to maxpacket size value of
* given endpoint.
*/
for (ep = 1; ep < MAX_EPS_CHANNELS; ep++) {
if (!txfsz[ep])
continue;
val = addr;
val |= txfsz[ep] << FIFOSIZE_DEPTH_SHIFT;
WARN_ONCE(addr + txfsz[ep] > hsotg->fifo_mem,
"insufficient fifo memory");
addr += txfsz[ep];
dwc2_writel(hsotg, val, DPTXFSIZN(ep));
val = dwc2_readl(hsotg, DPTXFSIZN(ep));
}
dwc2_writel(hsotg, hsotg->hw_params.total_fifo_size |
addr << GDFIFOCFG_EPINFOBASE_SHIFT,
GDFIFOCFG);
/*
* according to p428 of the design guide, we need to ensure that
* all fifos are flushed before continuing
*/
dwc2_writel(hsotg, GRSTCTL_TXFNUM(0x10) | GRSTCTL_TXFFLSH |
GRSTCTL_RXFFLSH, GRSTCTL);
/* wait until the fifos are both flushed */
timeout = 100;
while (1) {
val = dwc2_readl(hsotg, GRSTCTL);
if ((val & (GRSTCTL_TXFFLSH | GRSTCTL_RXFFLSH)) == 0)
break;
if (--timeout == 0) {
dev_err(hsotg->dev,
"%s: timeout flushing fifos (GRSTCTL=%08x)\n",
__func__, val);
break;
}
udelay(1);
}
dev_dbg(hsotg->dev, "FIFOs reset, timeout at %d\n", timeout);
}
/**
* dwc2_hsotg_ep_alloc_request - allocate USB rerequest structure
* @ep: USB endpoint to allocate request for.
* @flags: Allocation flags
*
* Allocate a new USB request structure appropriate for the specified endpoint
*/
static struct usb_request *dwc2_hsotg_ep_alloc_request(struct usb_ep *ep,
gfp_t flags)
{
struct dwc2_hsotg_req *req;
req = kzalloc(sizeof(*req), flags);
if (!req)
return NULL;
INIT_LIST_HEAD(&req->queue);
return &req->req;
}
/**
* is_ep_periodic - return true if the endpoint is in periodic mode.
* @hs_ep: The endpoint to query.
*
* Returns true if the endpoint is in periodic mode, meaning it is being
* used for an Interrupt or ISO transfer.
*/
static inline int is_ep_periodic(struct dwc2_hsotg_ep *hs_ep)
{
return hs_ep->periodic;
}
/**
* dwc2_hsotg_unmap_dma - unmap the DMA memory being used for the request
* @hsotg: The device state.
* @hs_ep: The endpoint for the request
* @hs_req: The request being processed.
*
* This is the reverse of dwc2_hsotg_map_dma(), called for the completion
* of a request to ensure the buffer is ready for access by the caller.
*/
static void dwc2_hsotg_unmap_dma(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req)
{
struct usb_request *req = &hs_req->req;
usb_gadget_unmap_request(&hsotg->gadget, req, hs_ep->dir_in);
}
/*
* dwc2_gadget_alloc_ctrl_desc_chains - allocate DMA descriptor chains
* for Control endpoint
* @hsotg: The device state.
*
* This function will allocate 4 descriptor chains for EP 0: 2 for
* Setup stage, per one for IN and OUT data/status transactions.
*/
static int dwc2_gadget_alloc_ctrl_desc_chains(struct dwc2_hsotg *hsotg)
{
hsotg->setup_desc[0] =
dmam_alloc_coherent(hsotg->dev,
sizeof(struct dwc2_dma_desc),
&hsotg->setup_desc_dma[0],
GFP_KERNEL);
if (!hsotg->setup_desc[0])
goto fail;
hsotg->setup_desc[1] =
dmam_alloc_coherent(hsotg->dev,
sizeof(struct dwc2_dma_desc),
&hsotg->setup_desc_dma[1],
GFP_KERNEL);
if (!hsotg->setup_desc[1])
goto fail;
hsotg->ctrl_in_desc =
dmam_alloc_coherent(hsotg->dev,
sizeof(struct dwc2_dma_desc),
&hsotg->ctrl_in_desc_dma,
GFP_KERNEL);
if (!hsotg->ctrl_in_desc)
goto fail;
hsotg->ctrl_out_desc =
dmam_alloc_coherent(hsotg->dev,
sizeof(struct dwc2_dma_desc),
&hsotg->ctrl_out_desc_dma,
GFP_KERNEL);
if (!hsotg->ctrl_out_desc)
goto fail;
return 0;
fail:
return -ENOMEM;
}
/**
* dwc2_hsotg_write_fifo - write packet Data to the TxFIFO
* @hsotg: The controller state.
* @hs_ep: The endpoint we're going to write for.
* @hs_req: The request to write data for.
*
* This is called when the TxFIFO has some space in it to hold a new
* transmission and we have something to give it. The actual setup of
* the data size is done elsewhere, so all we have to do is to actually
* write the data.
*
* The return value is zero if there is more space (or nothing was done)
* otherwise -ENOSPC is returned if the FIFO space was used up.
*
* This routine is only needed for PIO
*/
static int dwc2_hsotg_write_fifo(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req)
{
bool periodic = is_ep_periodic(hs_ep);
u32 gnptxsts = dwc2_readl(hsotg, GNPTXSTS);
int buf_pos = hs_req->req.actual;
int to_write = hs_ep->size_loaded;
void *data;
int can_write;
int pkt_round;
int max_transfer;
to_write -= (buf_pos - hs_ep->last_load);
/* if there's nothing to write, get out early */
if (to_write == 0)
return 0;
if (periodic && !hsotg->dedicated_fifos) {
u32 epsize = dwc2_readl(hsotg, DIEPTSIZ(hs_ep->index));
int size_left;
int size_done;
/*
* work out how much data was loaded so we can calculate
* how much data is left in the fifo.
*/
size_left = DXEPTSIZ_XFERSIZE_GET(epsize);
/*
* if shared fifo, we cannot write anything until the
* previous data has been completely sent.
*/
if (hs_ep->fifo_load != 0) {
dwc2_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP);
return -ENOSPC;
}
dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n",
__func__, size_left,
hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size);
/* how much of the data has moved */
size_done = hs_ep->size_loaded - size_left;
/* how much data is left in the fifo */
can_write = hs_ep->fifo_load - size_done;
dev_dbg(hsotg->dev, "%s: => can_write1=%d\n",
__func__, can_write);
can_write = hs_ep->fifo_size - can_write;
dev_dbg(hsotg->dev, "%s: => can_write2=%d\n",
__func__, can_write);
if (can_write <= 0) {
dwc2_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP);
return -ENOSPC;
}
} else if (hsotg->dedicated_fifos && hs_ep->index != 0) {
can_write = dwc2_readl(hsotg,
DTXFSTS(hs_ep->fifo_index));
can_write &= 0xffff;
can_write *= 4;
} else {
if (GNPTXSTS_NP_TXQ_SPC_AVAIL_GET(gnptxsts) == 0) {
dev_dbg(hsotg->dev,
"%s: no queue slots available (0x%08x)\n",
__func__, gnptxsts);
dwc2_hsotg_en_gsint(hsotg, GINTSTS_NPTXFEMP);
return -ENOSPC;
}
can_write = GNPTXSTS_NP_TXF_SPC_AVAIL_GET(gnptxsts);
can_write *= 4; /* fifo size is in 32bit quantities. */
}
max_transfer = hs_ep->ep.maxpacket * hs_ep->mc;
dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, max_transfer %d\n",
__func__, gnptxsts, can_write, to_write, max_transfer);
/*
* limit to 512 bytes of data, it seems at least on the non-periodic
* FIFO, requests of >512 cause the endpoint to get stuck with a
* fragment of the end of the transfer in it.
*/
if (can_write > 512 && !periodic)
can_write = 512;
/*
* limit the write to one max-packet size worth of data, but allow
* the transfer to return that it did not run out of fifo space
* doing it.
*/
if (to_write > max_transfer) {
to_write = max_transfer;
/* it's needed only when we do not use dedicated fifos */
if (!hsotg->dedicated_fifos)
dwc2_hsotg_en_gsint(hsotg,
periodic ? GINTSTS_PTXFEMP :
GINTSTS_NPTXFEMP);
}
/* see if we can write data */
if (to_write > can_write) {
to_write = can_write;
pkt_round = to_write % max_transfer;
/*
* Round the write down to an
* exact number of packets.
*
* Note, we do not currently check to see if we can ever
* write a full packet or not to the FIFO.
*/
if (pkt_round)
to_write -= pkt_round;
/*
* enable correct FIFO interrupt to alert us when there
* is more room left.
*/
/* it's needed only when we do not use dedicated fifos */
if (!hsotg->dedicated_fifos)
dwc2_hsotg_en_gsint(hsotg,
periodic ? GINTSTS_PTXFEMP :
GINTSTS_NPTXFEMP);
}
dev_dbg(hsotg->dev, "write %d/%d, can_write %d, done %d\n",
to_write, hs_req->req.length, can_write, buf_pos);
if (to_write <= 0)
return -ENOSPC;
hs_req->req.actual = buf_pos + to_write;
hs_ep->total_data += to_write;
if (periodic)
hs_ep->fifo_load += to_write;
to_write = DIV_ROUND_UP(to_write, 4);
data = hs_req->req.buf + buf_pos;
dwc2_writel_rep(hsotg, EPFIFO(hs_ep->index), data, to_write);
return (to_write >= can_write) ? -ENOSPC : 0;
}
/**
* get_ep_limit - get the maximum data legnth for this endpoint
* @hs_ep: The endpoint
*
* Return the maximum data that can be queued in one go on a given endpoint
* so that transfers that are too long can be split.
*/
static unsigned int get_ep_limit(struct dwc2_hsotg_ep *hs_ep)
{
int index = hs_ep->index;
unsigned int maxsize;
unsigned int maxpkt;
if (index != 0) {
maxsize = DXEPTSIZ_XFERSIZE_LIMIT + 1;
maxpkt = DXEPTSIZ_PKTCNT_LIMIT + 1;
} else {
maxsize = 64 + 64;
if (hs_ep->dir_in)
maxpkt = DIEPTSIZ0_PKTCNT_LIMIT + 1;
else
maxpkt = 2;
}
/* we made the constant loading easier above by using +1 */
maxpkt--;
maxsize--;
/*
* constrain by packet count if maxpkts*pktsize is greater
* than the length register size.
*/
if ((maxpkt * hs_ep->ep.maxpacket) < maxsize)
maxsize = maxpkt * hs_ep->ep.maxpacket;
return maxsize;
}
/**
* dwc2_hsotg_read_frameno - read current frame number
* @hsotg: The device instance
*
* Return the current frame number
*/
static u32 dwc2_hsotg_read_frameno(struct dwc2_hsotg *hsotg)
{
u32 dsts;
dsts = dwc2_readl(hsotg, DSTS);
dsts &= DSTS_SOFFN_MASK;
dsts >>= DSTS_SOFFN_SHIFT;
return dsts;
}
/**
* dwc2_gadget_get_chain_limit - get the maximum data payload value of the
* DMA descriptor chain prepared for specific endpoint
* @hs_ep: The endpoint
*
* Return the maximum data that can be queued in one go on a given endpoint
* depending on its descriptor chain capacity so that transfers that
* are too long can be split.
*/
static unsigned int dwc2_gadget_get_chain_limit(struct dwc2_hsotg_ep *hs_ep)
{
int is_isoc = hs_ep->isochronous;
unsigned int maxsize;
if (is_isoc)
maxsize = hs_ep->dir_in ? DEV_DMA_ISOC_TX_NBYTES_LIMIT :
DEV_DMA_ISOC_RX_NBYTES_LIMIT;
else
maxsize = DEV_DMA_NBYTES_LIMIT;
/* Above size of one descriptor was chosen, multiple it */
maxsize *= MAX_DMA_DESC_NUM_GENERIC;
return maxsize;
}
/*
* dwc2_gadget_get_desc_params - get DMA descriptor parameters.
* @hs_ep: The endpoint
* @mask: RX/TX bytes mask to be defined
*
* Returns maximum data payload for one descriptor after analyzing endpoint
* characteristics.
* DMA descriptor transfer bytes limit depends on EP type:
* Control out - MPS,
* Isochronous - descriptor rx/tx bytes bitfield limit,
* Control In/Bulk/Interrupt - multiple of mps. This will allow to not
* have concatenations from various descriptors within one packet.
*
* Selects corresponding mask for RX/TX bytes as well.
*/
static u32 dwc2_gadget_get_desc_params(struct dwc2_hsotg_ep *hs_ep, u32 *mask)
{
u32 mps = hs_ep->ep.maxpacket;
int dir_in = hs_ep->dir_in;
u32 desc_size = 0;
if (!hs_ep->index && !dir_in) {
desc_size = mps;
*mask = DEV_DMA_NBYTES_MASK;
} else if (hs_ep->isochronous) {
if (dir_in) {
desc_size = DEV_DMA_ISOC_TX_NBYTES_LIMIT;
*mask = DEV_DMA_ISOC_TX_NBYTES_MASK;
} else {
desc_size = DEV_DMA_ISOC_RX_NBYTES_LIMIT;
*mask = DEV_DMA_ISOC_RX_NBYTES_MASK;
}
} else {
desc_size = DEV_DMA_NBYTES_LIMIT;
*mask = DEV_DMA_NBYTES_MASK;
/* Round down desc_size to be mps multiple */
desc_size -= desc_size % mps;
}
return desc_size;
}
/*
* dwc2_gadget_config_nonisoc_xfer_ddma - prepare non ISOC DMA desc chain.
* @hs_ep: The endpoint
* @dma_buff: DMA address to use
* @len: Length of the transfer
*
* This function will iterate over descriptor chain and fill its entries
* with corresponding information based on transfer data.
*/
static void dwc2_gadget_config_nonisoc_xfer_ddma(struct dwc2_hsotg_ep *hs_ep,
dma_addr_t dma_buff,
unsigned int len)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
int dir_in = hs_ep->dir_in;
struct dwc2_dma_desc *desc = hs_ep->desc_list;
u32 mps = hs_ep->ep.maxpacket;
u32 maxsize = 0;
u32 offset = 0;
u32 mask = 0;
int i;
maxsize = dwc2_gadget_get_desc_params(hs_ep, &mask);
hs_ep->desc_count = (len / maxsize) +
((len % maxsize) ? 1 : 0);
if (len == 0)
hs_ep->desc_count = 1;
for (i = 0; i < hs_ep->desc_count; ++i) {
desc->status = 0;
desc->status |= (DEV_DMA_BUFF_STS_HBUSY
<< DEV_DMA_BUFF_STS_SHIFT);
if (len > maxsize) {
if (!hs_ep->index && !dir_in)
desc->status |= (DEV_DMA_L | DEV_DMA_IOC);
desc->status |= (maxsize <<
DEV_DMA_NBYTES_SHIFT & mask);
desc->buf = dma_buff + offset;
len -= maxsize;
offset += maxsize;
} else {
desc->status |= (DEV_DMA_L | DEV_DMA_IOC);
if (dir_in)
desc->status |= (len % mps) ? DEV_DMA_SHORT :
((hs_ep->send_zlp) ? DEV_DMA_SHORT : 0);
if (len > maxsize)
dev_err(hsotg->dev, "wrong len %d\n", len);
desc->status |=
len << DEV_DMA_NBYTES_SHIFT & mask;
desc->buf = dma_buff + offset;
}
desc->status &= ~DEV_DMA_BUFF_STS_MASK;
desc->status |= (DEV_DMA_BUFF_STS_HREADY
<< DEV_DMA_BUFF_STS_SHIFT);
desc++;
}
}
/*
* dwc2_gadget_fill_isoc_desc - fills next isochronous descriptor in chain.
* @hs_ep: The isochronous endpoint.
* @dma_buff: usb requests dma buffer.
* @len: usb request transfer length.
*
* Fills next free descriptor with the data of the arrived usb request,
* frame info, sets Last and IOC bits increments next_desc. If filled
* descriptor is not the first one, removes L bit from the previous descriptor
* status.
*/
static int dwc2_gadget_fill_isoc_desc(struct dwc2_hsotg_ep *hs_ep,
dma_addr_t dma_buff, unsigned int len)
{
struct dwc2_dma_desc *desc;
struct dwc2_hsotg *hsotg = hs_ep->parent;
u32 index;
u32 maxsize = 0;
u32 mask = 0;
u8 pid = 0;
maxsize = dwc2_gadget_get_desc_params(hs_ep, &mask);
index = hs_ep->next_desc;
desc = &hs_ep->desc_list[index];
/* Check if descriptor chain full */
if ((desc->status >> DEV_DMA_BUFF_STS_SHIFT) ==
DEV_DMA_BUFF_STS_HREADY) {
dev_dbg(hsotg->dev, "%s: desc chain full\n", __func__);
return 1;
}
/* Clear L bit of previous desc if more than one entries in the chain */
if (hs_ep->next_desc)
hs_ep->desc_list[index - 1].status &= ~DEV_DMA_L;
dev_dbg(hsotg->dev, "%s: Filling ep %d, dir %s isoc desc # %d\n",
__func__, hs_ep->index, hs_ep->dir_in ? "in" : "out", index);
desc->status = 0;
desc->status |= (DEV_DMA_BUFF_STS_HBUSY << DEV_DMA_BUFF_STS_SHIFT);
desc->buf = dma_buff;
desc->status |= (DEV_DMA_L | DEV_DMA_IOC |
((len << DEV_DMA_NBYTES_SHIFT) & mask));
if (hs_ep->dir_in) {
if (len)
pid = DIV_ROUND_UP(len, hs_ep->ep.maxpacket);
else
pid = 1;
desc->status |= ((pid << DEV_DMA_ISOC_PID_SHIFT) &
DEV_DMA_ISOC_PID_MASK) |
((len % hs_ep->ep.maxpacket) ?
DEV_DMA_SHORT : 0) |
((hs_ep->target_frame <<
DEV_DMA_ISOC_FRNUM_SHIFT) &
DEV_DMA_ISOC_FRNUM_MASK);
}
desc->status &= ~DEV_DMA_BUFF_STS_MASK;
desc->status |= (DEV_DMA_BUFF_STS_HREADY << DEV_DMA_BUFF_STS_SHIFT);
/* Increment frame number by interval for IN */
if (hs_ep->dir_in)
dwc2_gadget_incr_frame_num(hs_ep);
/* Update index of last configured entry in the chain */
hs_ep->next_desc++;
if (hs_ep->next_desc >= MAX_DMA_DESC_NUM_GENERIC)
hs_ep->next_desc = 0;
return 0;
}
/*
* dwc2_gadget_start_isoc_ddma - start isochronous transfer in DDMA
* @hs_ep: The isochronous endpoint.
*
* Prepare descriptor chain for isochronous endpoints. Afterwards
* write DMA address to HW and enable the endpoint.
*/
static void dwc2_gadget_start_isoc_ddma(struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
struct dwc2_hsotg_req *hs_req, *treq;
int index = hs_ep->index;
int ret;
int i;
u32 dma_reg;
u32 depctl;
u32 ctrl;
struct dwc2_dma_desc *desc;
if (list_empty(&hs_ep->queue)) {
hs_ep->target_frame = TARGET_FRAME_INITIAL;
dev_dbg(hsotg->dev, "%s: No requests in queue\n", __func__);
return;
}
/* Initialize descriptor chain by Host Busy status */
for (i = 0; i < MAX_DMA_DESC_NUM_GENERIC; i++) {
desc = &hs_ep->desc_list[i];
desc->status = 0;
desc->status |= (DEV_DMA_BUFF_STS_HBUSY
<< DEV_DMA_BUFF_STS_SHIFT);
}
hs_ep->next_desc = 0;
list_for_each_entry_safe(hs_req, treq, &hs_ep->queue, queue) {
ret = dwc2_gadget_fill_isoc_desc(hs_ep, hs_req->req.dma,
hs_req->req.length);
if (ret)
break;
}
hs_ep->compl_desc = 0;
depctl = hs_ep->dir_in ? DIEPCTL(index) : DOEPCTL(index);
dma_reg = hs_ep->dir_in ? DIEPDMA(index) : DOEPDMA(index);
/* write descriptor chain address to control register */
dwc2_writel(hsotg, hs_ep->desc_list_dma, dma_reg);
ctrl = dwc2_readl(hsotg, depctl);
ctrl |= DXEPCTL_EPENA | DXEPCTL_CNAK;
dwc2_writel(hsotg, ctrl, depctl);
}
/**
* dwc2_hsotg_start_req - start a USB request from an endpoint's queue
* @hsotg: The controller state.
* @hs_ep: The endpoint to process a request for
* @hs_req: The request to start.
* @continuing: True if we are doing more for the current request.
*
* Start the given request running by setting the endpoint registers
* appropriately, and writing any data to the FIFOs.
*/
static void dwc2_hsotg_start_req(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req,
bool continuing)
{
struct usb_request *ureq = &hs_req->req;
int index = hs_ep->index;
int dir_in = hs_ep->dir_in;
u32 epctrl_reg;
u32 epsize_reg;
u32 epsize;
u32 ctrl;
unsigned int length;
unsigned int packets;
unsigned int maxreq;
unsigned int dma_reg;
if (index != 0) {
if (hs_ep->req && !continuing) {
dev_err(hsotg->dev, "%s: active request\n", __func__);
WARN_ON(1);
return;
} else if (hs_ep->req != hs_req && continuing) {
dev_err(hsotg->dev,
"%s: continue different req\n", __func__);
WARN_ON(1);
return;
}
}
dma_reg = dir_in ? DIEPDMA(index) : DOEPDMA(index);
epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
epsize_reg = dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index);
dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x, ep %d, dir %s\n",
__func__, dwc2_readl(hsotg, epctrl_reg), index,
hs_ep->dir_in ? "in" : "out");
/* If endpoint is stalled, we will restart request later */
ctrl = dwc2_readl(hsotg, epctrl_reg);
if (index && ctrl & DXEPCTL_STALL) {
dev_warn(hsotg->dev, "%s: ep%d is stalled\n", __func__, index);
return;
}
length = ureq->length - ureq->actual;
dev_dbg(hsotg->dev, "ureq->length:%d ureq->actual:%d\n",
ureq->length, ureq->actual);
if (!using_desc_dma(hsotg))
maxreq = get_ep_limit(hs_ep);
else
maxreq = dwc2_gadget_get_chain_limit(hs_ep);
if (length > maxreq) {
int round = maxreq % hs_ep->ep.maxpacket;
dev_dbg(hsotg->dev, "%s: length %d, max-req %d, r %d\n",
__func__, length, maxreq, round);
/* round down to multiple of packets */
if (round)
maxreq -= round;
length = maxreq;
}
if (length)
packets = DIV_ROUND_UP(length, hs_ep->ep.maxpacket);
else
packets = 1; /* send one packet if length is zero. */
if (hs_ep->isochronous && length > (hs_ep->mc * hs_ep->ep.maxpacket)) {
dev_err(hsotg->dev, "req length > maxpacket*mc\n");
return;
}
if (dir_in && index != 0)
if (hs_ep->isochronous)
epsize = DXEPTSIZ_MC(packets);
else
epsize = DXEPTSIZ_MC(1);
else
epsize = 0;
/*
* zero length packet should be programmed on its own and should not
* be counted in DIEPTSIZ.PktCnt with other packets.
*/
if (dir_in && ureq->zero && !continuing) {
/* Test if zlp is actually required. */
if ((ureq->length >= hs_ep->ep.maxpacket) &&
!(ureq->length % hs_ep->ep.maxpacket))
hs_ep->send_zlp = 1;
}
epsize |= DXEPTSIZ_PKTCNT(packets);
epsize |= DXEPTSIZ_XFERSIZE(length);
dev_dbg(hsotg->dev, "%s: %d@%d/%d, 0x%08x => 0x%08x\n",
__func__, packets, length, ureq->length, epsize, epsize_reg);
/* store the request as the current one we're doing */
hs_ep->req = hs_req;
if (using_desc_dma(hsotg)) {
u32 offset = 0;
u32 mps = hs_ep->ep.maxpacket;
/* Adjust length: EP0 - MPS, other OUT EPs - multiple of MPS */
if (!dir_in) {
if (!index)
length = mps;
else if (length % mps)
length += (mps - (length % mps));
}
/*
* If more data to send, adjust DMA for EP0 out data stage.
* ureq->dma stays unchanged, hence increment it by already
* passed passed data count before starting new transaction.
*/
if (!index && hsotg->ep0_state == DWC2_EP0_DATA_OUT &&
continuing)
offset = ureq->actual;
/* Fill DDMA chain entries */
dwc2_gadget_config_nonisoc_xfer_ddma(hs_ep, ureq->dma + offset,
length);
/* write descriptor chain address to control register */
dwc2_writel(hsotg, hs_ep->desc_list_dma, dma_reg);
dev_dbg(hsotg->dev, "%s: %08x pad => 0x%08x\n",
__func__, (u32)hs_ep->desc_list_dma, dma_reg);
} else {
/* write size / packets */
dwc2_writel(hsotg, epsize, epsize_reg);
if (using_dma(hsotg) && !continuing && (length != 0)) {
/*
* write DMA address to control register, buffer
* already synced by dwc2_hsotg_ep_queue().
*/
dwc2_writel(hsotg, ureq->dma, dma_reg);
dev_dbg(hsotg->dev, "%s: %pad => 0x%08x\n",
__func__, &ureq->dma, dma_reg);
}
}
if (hs_ep->isochronous && hs_ep->interval == 1) {
hs_ep->target_frame = dwc2_hsotg_read_frameno(hsotg);
dwc2_gadget_incr_frame_num(hs_ep);
if (hs_ep->target_frame & 0x1)
ctrl |= DXEPCTL_SETODDFR;
else
ctrl |= DXEPCTL_SETEVENFR;
}
ctrl |= DXEPCTL_EPENA; /* ensure ep enabled */
dev_dbg(hsotg->dev, "ep0 state:%d\n", hsotg->ep0_state);
/* For Setup request do not clear NAK */
if (!(index == 0 && hsotg->ep0_state == DWC2_EP0_SETUP))
ctrl |= DXEPCTL_CNAK; /* clear NAK set by core */
dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl);
dwc2_writel(hsotg, ctrl, epctrl_reg);
/*
* set these, it seems that DMA support increments past the end
* of the packet buffer so we need to calculate the length from
* this information.
*/
hs_ep->size_loaded = length;
hs_ep->last_load = ureq->actual;
if (dir_in && !using_dma(hsotg)) {
/* set these anyway, we may need them for non-periodic in */
hs_ep->fifo_load = 0;
dwc2_hsotg_write_fifo(hsotg, hs_ep, hs_req);
}
/*
* Note, trying to clear the NAK here causes problems with transmit
* on the S3C6400 ending up with the TXFIFO becoming full.
*/
/* check ep is enabled */
if (!(dwc2_readl(hsotg, epctrl_reg) & DXEPCTL_EPENA))
dev_dbg(hsotg->dev,
"ep%d: failed to become enabled (DXEPCTL=0x%08x)?\n",
index, dwc2_readl(hsotg, epctrl_reg));
dev_dbg(hsotg->dev, "%s: DXEPCTL=0x%08x\n",
__func__, dwc2_readl(hsotg, epctrl_reg));
/* enable ep interrupts */
dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 1);
}
/**
* dwc2_hsotg_map_dma - map the DMA memory being used for the request
* @hsotg: The device state.
* @hs_ep: The endpoint the request is on.
* @req: The request being processed.
*
* We've been asked to queue a request, so ensure that the memory buffer
* is correctly setup for DMA. If we've been passed an extant DMA address
* then ensure the buffer has been synced to memory. If our buffer has no
* DMA memory, then we map the memory and mark our request to allow us to
* cleanup on completion.
*/
static int dwc2_hsotg_map_dma(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct usb_request *req)
{
int ret;
ret = usb_gadget_map_request(&hsotg->gadget, req, hs_ep->dir_in);
if (ret)
goto dma_error;
return 0;
dma_error:
dev_err(hsotg->dev, "%s: failed to map buffer %p, %d bytes\n",
__func__, req->buf, req->length);
return -EIO;
}
static int dwc2_hsotg_handle_unaligned_buf_start(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req)
{
void *req_buf = hs_req->req.buf;
/* If dma is not being used or buffer is aligned */
if (!using_dma(hsotg) || !((long)req_buf & 3))
return 0;
WARN_ON(hs_req->saved_req_buf);
dev_dbg(hsotg->dev, "%s: %s: buf=%p length=%d\n", __func__,
hs_ep->ep.name, req_buf, hs_req->req.length);
hs_req->req.buf = kmalloc(hs_req->req.length, GFP_ATOMIC);
if (!hs_req->req.buf) {
hs_req->req.buf = req_buf;
dev_err(hsotg->dev,
"%s: unable to allocate memory for bounce buffer\n",
__func__);
return -ENOMEM;
}
/* Save actual buffer */
hs_req->saved_req_buf = req_buf;
if (hs_ep->dir_in)
memcpy(hs_req->req.buf, req_buf, hs_req->req.length);
return 0;
}
static void
dwc2_hsotg_handle_unaligned_buf_complete(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req)
{
/* If dma is not being used or buffer was aligned */
if (!using_dma(hsotg) || !hs_req->saved_req_buf)
return;
dev_dbg(hsotg->dev, "%s: %s: status=%d actual-length=%d\n", __func__,
hs_ep->ep.name, hs_req->req.status, hs_req->req.actual);
/* Copy data from bounce buffer on successful out transfer */
if (!hs_ep->dir_in && !hs_req->req.status)
memcpy(hs_req->saved_req_buf, hs_req->req.buf,
hs_req->req.actual);
/* Free bounce buffer */
kfree(hs_req->req.buf);
hs_req->req.buf = hs_req->saved_req_buf;
hs_req->saved_req_buf = NULL;
}
/**
* dwc2_gadget_target_frame_elapsed - Checks target frame
* @hs_ep: The driver endpoint to check
*
* Returns 1 if targeted frame elapsed. If returned 1 then we need to drop
* corresponding transfer.
*/
static bool dwc2_gadget_target_frame_elapsed(struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
u32 target_frame = hs_ep->target_frame;
u32 current_frame = hsotg->frame_number;
bool frame_overrun = hs_ep->frame_overrun;
if (!frame_overrun && current_frame >= target_frame)
return true;
if (frame_overrun && current_frame >= target_frame &&
((current_frame - target_frame) < DSTS_SOFFN_LIMIT / 2))
return true;
return false;
}
/*
* dwc2_gadget_set_ep0_desc_chain - Set EP's desc chain pointers
* @hsotg: The driver state
* @hs_ep: the ep descriptor chain is for
*
* Called to update EP0 structure's pointers depend on stage of
* control transfer.
*/
static int dwc2_gadget_set_ep0_desc_chain(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep)
{
switch (hsotg->ep0_state) {
case DWC2_EP0_SETUP:
case DWC2_EP0_STATUS_OUT:
hs_ep->desc_list = hsotg->setup_desc[0];
hs_ep->desc_list_dma = hsotg->setup_desc_dma[0];
break;
case DWC2_EP0_DATA_IN:
case DWC2_EP0_STATUS_IN:
hs_ep->desc_list = hsotg->ctrl_in_desc;
hs_ep->desc_list_dma = hsotg->ctrl_in_desc_dma;
break;
case DWC2_EP0_DATA_OUT:
hs_ep->desc_list = hsotg->ctrl_out_desc;
hs_ep->desc_list_dma = hsotg->ctrl_out_desc_dma;
break;
default:
dev_err(hsotg->dev, "invalid EP 0 state in queue %d\n",
hsotg->ep0_state);
return -EINVAL;
}
return 0;
}
static int dwc2_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req,
gfp_t gfp_flags)
{
struct dwc2_hsotg_req *hs_req = our_req(req);
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hs = hs_ep->parent;
bool first;
int ret;
u32 maxsize = 0;
u32 mask = 0;
dev_dbg(hs->dev, "%s: req %p: %d@%p, noi=%d, zero=%d, snok=%d\n",
ep->name, req, req->length, req->buf, req->no_interrupt,
req->zero, req->short_not_ok);
/* Prevent new request submission when controller is suspended */
if (hs->lx_state != DWC2_L0) {
dev_dbg(hs->dev, "%s: submit request only in active state\n",
__func__);
return -EAGAIN;
}
/* initialise status of the request */
INIT_LIST_HEAD(&hs_req->queue);
req->actual = 0;
req->status = -EINPROGRESS;
/* In DDMA mode for ISOC's don't queue request if length greater
* than descriptor limits.
*/
if (using_desc_dma(hs) && hs_ep->isochronous) {
maxsize = dwc2_gadget_get_desc_params(hs_ep, &mask);
if (hs_ep->dir_in && req->length > maxsize) {
dev_err(hs->dev, "wrong length %d (maxsize=%d)\n",
req->length, maxsize);
return -EINVAL;
}
if (!hs_ep->dir_in && req->length > hs_ep->ep.maxpacket) {
dev_err(hs->dev, "ISOC OUT: wrong length %d (mps=%d)\n",
req->length, hs_ep->ep.maxpacket);
return -EINVAL;
}
}
ret = dwc2_hsotg_handle_unaligned_buf_start(hs, hs_ep, hs_req);
if (ret)
return ret;
/* if we're using DMA, sync the buffers as necessary */
if (using_dma(hs)) {
ret = dwc2_hsotg_map_dma(hs, hs_ep, req);
if (ret)
return ret;
}
/* If using descriptor DMA configure EP0 descriptor chain pointers */
if (using_desc_dma(hs) && !hs_ep->index) {
ret = dwc2_gadget_set_ep0_desc_chain(hs, hs_ep);
if (ret)
return ret;
}
first = list_empty(&hs_ep->queue);
list_add_tail(&hs_req->queue, &hs_ep->queue);
/*
* Handle DDMA isochronous transfers separately - just add new entry
* to the descriptor chain.
* Transfer will be started once SW gets either one of NAK or
* OutTknEpDis interrupts.
*/
if (using_desc_dma(hs) && hs_ep->isochronous) {
if (hs_ep->target_frame != TARGET_FRAME_INITIAL) {
dwc2_gadget_fill_isoc_desc(hs_ep, hs_req->req.dma,
hs_req->req.length);
}
return 0;
}
if (first) {
if (!hs_ep->isochronous) {
dwc2_hsotg_start_req(hs, hs_ep, hs_req, false);
return 0;
}
/* Update current frame number value. */
hs->frame_number = dwc2_hsotg_read_frameno(hs);
while (dwc2_gadget_target_frame_elapsed(hs_ep)) {
dwc2_gadget_incr_frame_num(hs_ep);
/* Update current frame number value once more as it
* changes here.
*/
hs->frame_number = dwc2_hsotg_read_frameno(hs);
}
if (hs_ep->target_frame != TARGET_FRAME_INITIAL)
dwc2_hsotg_start_req(hs, hs_ep, hs_req, false);
}
return 0;
}
static int dwc2_hsotg_ep_queue_lock(struct usb_ep *ep, struct usb_request *req,
gfp_t gfp_flags)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hs = hs_ep->parent;
unsigned long flags = 0;
int ret = 0;
spin_lock_irqsave(&hs->lock, flags);
ret = dwc2_hsotg_ep_queue(ep, req, gfp_flags);
spin_unlock_irqrestore(&hs->lock, flags);
return ret;
}
static void dwc2_hsotg_ep_free_request(struct usb_ep *ep,
struct usb_request *req)
{
struct dwc2_hsotg_req *hs_req = our_req(req);
kfree(hs_req);
}
/**
* dwc2_hsotg_complete_oursetup - setup completion callback
* @ep: The endpoint the request was on.
* @req: The request completed.
*
* Called on completion of any requests the driver itself
* submitted that need cleaning up.
*/
static void dwc2_hsotg_complete_oursetup(struct usb_ep *ep,
struct usb_request *req)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hsotg = hs_ep->parent;
dev_dbg(hsotg->dev, "%s: ep %p, req %p\n", __func__, ep, req);
dwc2_hsotg_ep_free_request(ep, req);
}
/**
* ep_from_windex - convert control wIndex value to endpoint
* @hsotg: The driver state.
* @windex: The control request wIndex field (in host order).
*
* Convert the given wIndex into a pointer to an driver endpoint
* structure, or return NULL if it is not a valid endpoint.
*/
static struct dwc2_hsotg_ep *ep_from_windex(struct dwc2_hsotg *hsotg,
u32 windex)
{
struct dwc2_hsotg_ep *ep;
int dir = (windex & USB_DIR_IN) ? 1 : 0;
int idx = windex & 0x7F;
if (windex >= 0x100)
return NULL;
if (idx > hsotg->num_of_eps)
return NULL;
ep = index_to_ep(hsotg, idx, dir);
if (idx && ep->dir_in != dir)
return NULL;
return ep;
}
/**
* dwc2_hsotg_set_test_mode - Enable usb Test Modes
* @hsotg: The driver state.
* @testmode: requested usb test mode
* Enable usb Test Mode requested by the Host.
*/
int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, int testmode)
{
int dctl = dwc2_readl(hsotg, DCTL);
dctl &= ~DCTL_TSTCTL_MASK;
switch (testmode) {
case TEST_J:
case TEST_K:
case TEST_SE0_NAK:
case TEST_PACKET:
case TEST_FORCE_EN:
dctl |= testmode << DCTL_TSTCTL_SHIFT;
break;
default:
return -EINVAL;
}
dwc2_writel(hsotg, dctl, DCTL);
return 0;
}
/**
* dwc2_hsotg_send_reply - send reply to control request
* @hsotg: The device state
* @ep: Endpoint 0
* @buff: Buffer for request
* @length: Length of reply.
*
* Create a request and queue it on the given endpoint. This is useful as
* an internal method of sending replies to certain control requests, etc.
*/
static int dwc2_hsotg_send_reply(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *ep,
void *buff,
int length)
{
struct usb_request *req;
int ret;
dev_dbg(hsotg->dev, "%s: buff %p, len %d\n", __func__, buff, length);
req = dwc2_hsotg_ep_alloc_request(&ep->ep, GFP_ATOMIC);
hsotg->ep0_reply = req;
if (!req) {
dev_warn(hsotg->dev, "%s: cannot alloc req\n", __func__);
return -ENOMEM;
}
req->buf = hsotg->ep0_buff;
req->length = length;
/*
* zero flag is for sending zlp in DATA IN stage. It has no impact on
* STATUS stage.
*/
req->zero = 0;
req->complete = dwc2_hsotg_complete_oursetup;
if (length)
memcpy(req->buf, buff, length);
ret = dwc2_hsotg_ep_queue(&ep->ep, req, GFP_ATOMIC);
if (ret) {
dev_warn(hsotg->dev, "%s: cannot queue req\n", __func__);
return ret;
}
return 0;
}
/**
* dwc2_hsotg_process_req_status - process request GET_STATUS
* @hsotg: The device state
* @ctrl: USB control request
*/
static int dwc2_hsotg_process_req_status(struct dwc2_hsotg *hsotg,
struct usb_ctrlrequest *ctrl)
{
struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
struct dwc2_hsotg_ep *ep;
__le16 reply;
int ret;
dev_dbg(hsotg->dev, "%s: USB_REQ_GET_STATUS\n", __func__);
if (!ep0->dir_in) {
dev_warn(hsotg->dev, "%s: direction out?\n", __func__);
return -EINVAL;
}
switch (ctrl->bRequestType & USB_RECIP_MASK) {
case USB_RECIP_DEVICE:
/*
* bit 0 => self powered
* bit 1 => remote wakeup
*/
reply = cpu_to_le16(0);
break;
case USB_RECIP_INTERFACE:
/* currently, the data result should be zero */
reply = cpu_to_le16(0);
break;
case USB_RECIP_ENDPOINT:
ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex));
if (!ep)
return -ENOENT;
reply = cpu_to_le16(ep->halted ? 1 : 0);
break;
default:
return 0;
}
if (le16_to_cpu(ctrl->wLength) != 2)
return -EINVAL;
ret = dwc2_hsotg_send_reply(hsotg, ep0, &reply, 2);
if (ret) {
dev_err(hsotg->dev, "%s: failed to send reply\n", __func__);
return ret;
}
return 1;
}
static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now);
/**
* get_ep_head - return the first request on the endpoint
* @hs_ep: The controller endpoint to get
*
* Get the first request on the endpoint.
*/
static struct dwc2_hsotg_req *get_ep_head(struct dwc2_hsotg_ep *hs_ep)
{
return list_first_entry_or_null(&hs_ep->queue, struct dwc2_hsotg_req,
queue);
}
/**
* dwc2_gadget_start_next_request - Starts next request from ep queue
* @hs_ep: Endpoint structure
*
* If queue is empty and EP is ISOC-OUT - unmasks OUTTKNEPDIS which is masked
* in its handler. Hence we need to unmask it here to be able to do
* resynchronization.
*/
static void dwc2_gadget_start_next_request(struct dwc2_hsotg_ep *hs_ep)
{
u32 mask;
struct dwc2_hsotg *hsotg = hs_ep->parent;
int dir_in = hs_ep->dir_in;
struct dwc2_hsotg_req *hs_req;
u32 epmsk_reg = dir_in ? DIEPMSK : DOEPMSK;
if (!list_empty(&hs_ep->queue)) {
hs_req = get_ep_head(hs_ep);
dwc2_hsotg_start_req(hsotg, hs_ep, hs_req, false);
return;
}
if (!hs_ep->isochronous)
return;
if (dir_in) {
dev_dbg(hsotg->dev, "%s: No more ISOC-IN requests\n",
__func__);
} else {
dev_dbg(hsotg->dev, "%s: No more ISOC-OUT requests\n",
__func__);
mask = dwc2_readl(hsotg, epmsk_reg);
mask |= DOEPMSK_OUTTKNEPDISMSK;
dwc2_writel(hsotg, mask, epmsk_reg);
}
}
/**
* dwc2_hsotg_process_req_feature - process request {SET,CLEAR}_FEATURE
* @hsotg: The device state
* @ctrl: USB control request
*/
static int dwc2_hsotg_process_req_feature(struct dwc2_hsotg *hsotg,
struct usb_ctrlrequest *ctrl)
{
struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
struct dwc2_hsotg_req *hs_req;
bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
struct dwc2_hsotg_ep *ep;
int ret;
bool halted;
u32 recip;
u32 wValue;
u32 wIndex;
dev_dbg(hsotg->dev, "%s: %s_FEATURE\n",
__func__, set ? "SET" : "CLEAR");
wValue = le16_to_cpu(ctrl->wValue);
wIndex = le16_to_cpu(ctrl->wIndex);
recip = ctrl->bRequestType & USB_RECIP_MASK;
switch (recip) {
case USB_RECIP_DEVICE:
switch (wValue) {
case USB_DEVICE_REMOTE_WAKEUP:
hsotg->remote_wakeup_allowed = 1;
break;
case USB_DEVICE_TEST_MODE:
if ((wIndex & 0xff) != 0)
return -EINVAL;
if (!set)
return -EINVAL;
hsotg->test_mode = wIndex >> 8;
ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
if (ret) {
dev_err(hsotg->dev,
"%s: failed to send reply\n", __func__);
return ret;
}
break;
default:
return -ENOENT;
}
break;
case USB_RECIP_ENDPOINT:
ep = ep_from_windex(hsotg, wIndex);
if (!ep) {
dev_dbg(hsotg->dev, "%s: no endpoint for 0x%04x\n",
__func__, wIndex);
return -ENOENT;
}
switch (wValue) {
case USB_ENDPOINT_HALT:
halted = ep->halted;
dwc2_hsotg_ep_sethalt(&ep->ep, set, true);
ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
if (ret) {
dev_err(hsotg->dev,
"%s: failed to send reply\n", __func__);
return ret;
}
/*
* we have to complete all requests for ep if it was
* halted, and the halt was cleared by CLEAR_FEATURE
*/
if (!set && halted) {
/*
* If we have request in progress,
* then complete it
*/
if (ep->req) {
hs_req = ep->req;
ep->req = NULL;
list_del_init(&hs_req->queue);
if (hs_req->req.complete) {
spin_unlock(&hsotg->lock);
usb_gadget_giveback_request(
&ep->ep, &hs_req->req);
spin_lock(&hsotg->lock);
}
}
/* If we have pending request, then start it */
if (!ep->req)
dwc2_gadget_start_next_request(ep);
}
break;
default:
return -ENOENT;
}
break;
default:
return -ENOENT;
}
return 1;
}
static void dwc2_hsotg_enqueue_setup(struct dwc2_hsotg *hsotg);
/**
* dwc2_hsotg_stall_ep0 - stall ep0
* @hsotg: The device state
*
* Set stall for ep0 as response for setup request.
*/
static void dwc2_hsotg_stall_ep0(struct dwc2_hsotg *hsotg)
{
struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
u32 reg;
u32 ctrl;
dev_dbg(hsotg->dev, "ep0 stall (dir=%d)\n", ep0->dir_in);
reg = (ep0->dir_in) ? DIEPCTL0 : DOEPCTL0;
/*
* DxEPCTL_Stall will be cleared by EP once it has
* taken effect, so no need to clear later.
*/
ctrl = dwc2_readl(hsotg, reg);
ctrl |= DXEPCTL_STALL;
ctrl |= DXEPCTL_CNAK;
dwc2_writel(hsotg, ctrl, reg);
dev_dbg(hsotg->dev,
"written DXEPCTL=0x%08x to %08x (DXEPCTL=0x%08x)\n",
ctrl, reg, dwc2_readl(hsotg, reg));
/*
* complete won't be called, so we enqueue
* setup request here
*/
dwc2_hsotg_enqueue_setup(hsotg);
}
/**
* dwc2_hsotg_process_control - process a control request
* @hsotg: The device state
* @ctrl: The control request received
*
* The controller has received the SETUP phase of a control request, and
* needs to work out what to do next (and whether to pass it on to the
* gadget driver).
*/
static void dwc2_hsotg_process_control(struct dwc2_hsotg *hsotg,
struct usb_ctrlrequest *ctrl)
{
struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
int ret = 0;
u32 dcfg;
dev_dbg(hsotg->dev,
"ctrl Type=%02x, Req=%02x, V=%04x, I=%04x, L=%04x\n",
ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
ctrl->wIndex, ctrl->wLength);
if (ctrl->wLength == 0) {
ep0->dir_in = 1;
hsotg->ep0_state = DWC2_EP0_STATUS_IN;
} else if (ctrl->bRequestType & USB_DIR_IN) {
ep0->dir_in = 1;
hsotg->ep0_state = DWC2_EP0_DATA_IN;
} else {
ep0->dir_in = 0;
hsotg->ep0_state = DWC2_EP0_DATA_OUT;
}
if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
switch (ctrl->bRequest) {
case USB_REQ_SET_ADDRESS:
hsotg->connected = 1;
dcfg = dwc2_readl(hsotg, DCFG);
dcfg &= ~DCFG_DEVADDR_MASK;
dcfg |= (le16_to_cpu(ctrl->wValue) <<
DCFG_DEVADDR_SHIFT) & DCFG_DEVADDR_MASK;
dwc2_writel(hsotg, dcfg, DCFG);
dev_info(hsotg->dev, "new address %d\n", ctrl->wValue);
ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
return;
case USB_REQ_GET_STATUS:
ret = dwc2_hsotg_process_req_status(hsotg, ctrl);
break;
case USB_REQ_CLEAR_FEATURE:
case USB_REQ_SET_FEATURE:
ret = dwc2_hsotg_process_req_feature(hsotg, ctrl);
break;
}
}
/* as a fallback, try delivering it to the driver to deal with */
if (ret == 0 && hsotg->driver) {
spin_unlock(&hsotg->lock);
ret = hsotg->driver->setup(&hsotg->gadget, ctrl);
spin_lock(&hsotg->lock);
if (ret < 0)
dev_dbg(hsotg->dev, "driver->setup() ret %d\n", ret);
}
/*
* the request is either unhandlable, or is not formatted correctly
* so respond with a STALL for the status stage to indicate failure.
*/
if (ret < 0)
dwc2_hsotg_stall_ep0(hsotg);
}
/**
* dwc2_hsotg_complete_setup - completion of a setup transfer
* @ep: The endpoint the request was on.
* @req: The request completed.
*
* Called on completion of any requests the driver itself submitted for
* EP0 setup packets
*/
static void dwc2_hsotg_complete_setup(struct usb_ep *ep,
struct usb_request *req)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hsotg = hs_ep->parent;
if (req->status < 0) {
dev_dbg(hsotg->dev, "%s: failed %d\n", __func__, req->status);
return;
}
spin_lock(&hsotg->lock);
if (req->actual == 0)
dwc2_hsotg_enqueue_setup(hsotg);
else
dwc2_hsotg_process_control(hsotg, req->buf);
spin_unlock(&hsotg->lock);
}
/**
* dwc2_hsotg_enqueue_setup - start a request for EP0 packets
* @hsotg: The device state.
*
* Enqueue a request on EP0 if necessary to received any SETUP packets
* received from the host.
*/
static void dwc2_hsotg_enqueue_setup(struct dwc2_hsotg *hsotg)
{
struct usb_request *req = hsotg->ctrl_req;
struct dwc2_hsotg_req *hs_req = our_req(req);
int ret;
dev_dbg(hsotg->dev, "%s: queueing setup request\n", __func__);
req->zero = 0;
req->length = 8;
req->buf = hsotg->ctrl_buff;
req->complete = dwc2_hsotg_complete_setup;
if (!list_empty(&hs_req->queue)) {
dev_dbg(hsotg->dev, "%s already queued???\n", __func__);
return;
}
hsotg->eps_out[0]->dir_in = 0;
hsotg->eps_out[0]->send_zlp = 0;
hsotg->ep0_state = DWC2_EP0_SETUP;
ret = dwc2_hsotg_ep_queue(&hsotg->eps_out[0]->ep, req, GFP_ATOMIC);
if (ret < 0) {
dev_err(hsotg->dev, "%s: failed queue (%d)\n", __func__, ret);
/*
* Don't think there's much we can do other than watch the
* driver fail.
*/
}
}
static void dwc2_hsotg_program_zlp(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep)
{
u32 ctrl;
u8 index = hs_ep->index;
u32 epctl_reg = hs_ep->dir_in ? DIEPCTL(index) : DOEPCTL(index);
u32 epsiz_reg = hs_ep->dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index);
if (hs_ep->dir_in)
dev_dbg(hsotg->dev, "Sending zero-length packet on ep%d\n",
index);
else
dev_dbg(hsotg->dev, "Receiving zero-length packet on ep%d\n",
index);
if (using_desc_dma(hsotg)) {
/* Not specific buffer needed for ep0 ZLP */
dma_addr_t dma = hs_ep->desc_list_dma;
if (!index)
dwc2_gadget_set_ep0_desc_chain(hsotg, hs_ep);
dwc2_gadget_config_nonisoc_xfer_ddma(hs_ep, dma, 0);
} else {
dwc2_writel(hsotg, DXEPTSIZ_MC(1) | DXEPTSIZ_PKTCNT(1) |
DXEPTSIZ_XFERSIZE(0),
epsiz_reg);
}
ctrl = dwc2_readl(hsotg, epctl_reg);
ctrl |= DXEPCTL_CNAK; /* clear NAK set by core */
ctrl |= DXEPCTL_EPENA; /* ensure ep enabled */
ctrl |= DXEPCTL_USBACTEP;
dwc2_writel(hsotg, ctrl, epctl_reg);
}
/**
* dwc2_hsotg_complete_request - complete a request given to us
* @hsotg: The device state.
* @hs_ep: The endpoint the request was on.
* @hs_req: The request to complete.
* @result: The result code (0 => Ok, otherwise errno)
*
* The given request has finished, so call the necessary completion
* if it has one and then look to see if we can start a new request
* on the endpoint.
*
* Note, expects the ep to already be locked as appropriate.
*/
static void dwc2_hsotg_complete_request(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req,
int result)
{
if (!hs_req) {
dev_dbg(hsotg->dev, "%s: nothing to complete?\n", __func__);
return;
}
dev_dbg(hsotg->dev, "complete: ep %p %s, req %p, %d => %p\n",
hs_ep, hs_ep->ep.name, hs_req, result, hs_req->req.complete);
/*
* only replace the status if we've not already set an error
* from a previous transaction
*/
if (hs_req->req.status == -EINPROGRESS)
hs_req->req.status = result;
if (using_dma(hsotg))
dwc2_hsotg_unmap_dma(hsotg, hs_ep, hs_req);
dwc2_hsotg_handle_unaligned_buf_complete(hsotg, hs_ep, hs_req);
hs_ep->req = NULL;
list_del_init(&hs_req->queue);
/*
* call the complete request with the locks off, just in case the
* request tries to queue more work for this endpoint.
*/
if (hs_req->req.complete) {
spin_unlock(&hsotg->lock);
usb_gadget_giveback_request(&hs_ep->ep, &hs_req->req);
spin_lock(&hsotg->lock);
}
/* In DDMA don't need to proceed to starting of next ISOC request */
if (using_desc_dma(hsotg) && hs_ep->isochronous)
return;
/*
* Look to see if there is anything else to do. Note, the completion
* of the previous request may have caused a new request to be started
* so be careful when doing this.
*/
if (!hs_ep->req && result >= 0)
dwc2_gadget_start_next_request(hs_ep);
}
/*
* dwc2_gadget_complete_isoc_request_ddma - complete an isoc request in DDMA
* @hs_ep: The endpoint the request was on.
*
* Get first request from the ep queue, determine descriptor on which complete
* happened. SW discovers which descriptor currently in use by HW, adjusts
* dma_address and calculates index of completed descriptor based on the value
* of DEPDMA register. Update actual length of request, giveback to gadget.
*/
static void dwc2_gadget_complete_isoc_request_ddma(struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
struct dwc2_hsotg_req *hs_req;
struct usb_request *ureq;
u32 desc_sts;
u32 mask;
desc_sts = hs_ep->desc_list[hs_ep->compl_desc].status;
/* Process only descriptors with buffer status set to DMA done */
while ((desc_sts & DEV_DMA_BUFF_STS_MASK) >>
DEV_DMA_BUFF_STS_SHIFT == DEV_DMA_BUFF_STS_DMADONE) {
hs_req = get_ep_head(hs_ep);
if (!hs_req) {
dev_warn(hsotg->dev, "%s: ISOC EP queue empty\n", __func__);
return;
}
ureq = &hs_req->req;
/* Check completion status */
if ((desc_sts & DEV_DMA_STS_MASK) >> DEV_DMA_STS_SHIFT ==
DEV_DMA_STS_SUCC) {
mask = hs_ep->dir_in ? DEV_DMA_ISOC_TX_NBYTES_MASK :
DEV_DMA_ISOC_RX_NBYTES_MASK;
ureq->actual = ureq->length - ((desc_sts & mask) >>
DEV_DMA_ISOC_NBYTES_SHIFT);
/* Adjust actual len for ISOC Out if len is
* not align of 4
*/
if (!hs_ep->dir_in && ureq->length & 0x3)
ureq->actual += 4 - (ureq->length & 0x3);
}
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
hs_ep->compl_desc++;
if (hs_ep->compl_desc > (MAX_DMA_DESC_NUM_GENERIC - 1))
hs_ep->compl_desc = 0;
desc_sts = hs_ep->desc_list[hs_ep->compl_desc].status;
}
}
/*
* dwc2_gadget_handle_isoc_bna - handle BNA interrupt for ISOC.
* @hs_ep: The isochronous endpoint.
*
* If EP ISOC OUT then need to flush RX FIFO to remove source of BNA
* interrupt. Reset target frame and next_desc to allow to start
* ISOC's on NAK interrupt for IN direction or on OUTTKNEPDIS
* interrupt for OUT direction.
*/
static void dwc2_gadget_handle_isoc_bna(struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
if (!hs_ep->dir_in)
dwc2_flush_rx_fifo(hsotg);
dwc2_hsotg_complete_request(hsotg, hs_ep, get_ep_head(hs_ep), 0);
hs_ep->target_frame = TARGET_FRAME_INITIAL;
hs_ep->next_desc = 0;
hs_ep->compl_desc = 0;
}
/**
* dwc2_hsotg_rx_data - receive data from the FIFO for an endpoint
* @hsotg: The device state.
* @ep_idx: The endpoint index for the data
* @size: The size of data in the fifo, in bytes
*
* The FIFO status shows there is data to read from the FIFO for a given
* endpoint, so sort out whether we need to read the data into a request
* that has been made for that endpoint.
*/
static void dwc2_hsotg_rx_data(struct dwc2_hsotg *hsotg, int ep_idx, int size)
{
struct dwc2_hsotg_ep *hs_ep = hsotg->eps_out[ep_idx];
struct dwc2_hsotg_req *hs_req = hs_ep->req;
int to_read;
int max_req;
int read_ptr;
if (!hs_req) {
u32 epctl = dwc2_readl(hsotg, DOEPCTL(ep_idx));
int ptr;
dev_dbg(hsotg->dev,
"%s: FIFO %d bytes on ep%d but no req (DXEPCTl=0x%08x)\n",
__func__, size, ep_idx, epctl);
/* dump the data from the FIFO, we've nothing we can do */
for (ptr = 0; ptr < size; ptr += 4)
(void)dwc2_readl(hsotg, EPFIFO(ep_idx));
return;
}
to_read = size;
read_ptr = hs_req->req.actual;
max_req = hs_req->req.length - read_ptr;
dev_dbg(hsotg->dev, "%s: read %d/%d, done %d/%d\n",
__func__, to_read, max_req, read_ptr, hs_req->req.length);
if (to_read > max_req) {
/*
* more data appeared than we where willing
* to deal with in this request.
*/
/* currently we don't deal this */
WARN_ON_ONCE(1);
}
hs_ep->total_data += to_read;
hs_req->req.actual += to_read;
to_read = DIV_ROUND_UP(to_read, 4);
/*
* note, we might over-write the buffer end by 3 bytes depending on
* alignment of the data.
*/
dwc2_readl_rep(hsotg, EPFIFO(ep_idx),
hs_req->req.buf + read_ptr, to_read);
}
/**
* dwc2_hsotg_ep0_zlp - send/receive zero-length packet on control endpoint
* @hsotg: The device instance
* @dir_in: If IN zlp
*
* Generate a zero-length IN packet request for terminating a SETUP
* transaction.
*
* Note, since we don't write any data to the TxFIFO, then it is
* currently believed that we do not need to wait for any space in
* the TxFIFO.
*/
static void dwc2_hsotg_ep0_zlp(struct dwc2_hsotg *hsotg, bool dir_in)
{
/* eps_out[0] is used in both directions */
hsotg->eps_out[0]->dir_in = dir_in;
hsotg->ep0_state = dir_in ? DWC2_EP0_STATUS_IN : DWC2_EP0_STATUS_OUT;
dwc2_hsotg_program_zlp(hsotg, hsotg->eps_out[0]);
}
static void dwc2_hsotg_change_ep_iso_parity(struct dwc2_hsotg *hsotg,
u32 epctl_reg)
{
u32 ctrl;
ctrl = dwc2_readl(hsotg, epctl_reg);
if (ctrl & DXEPCTL_EOFRNUM)
ctrl |= DXEPCTL_SETEVENFR;
else
ctrl |= DXEPCTL_SETODDFR;
dwc2_writel(hsotg, ctrl, epctl_reg);
}
/*
* dwc2_gadget_get_xfersize_ddma - get transferred bytes amount from desc
* @hs_ep - The endpoint on which transfer went
*
* Iterate over endpoints descriptor chain and get info on bytes remained
* in DMA descriptors after transfer has completed. Used for non isoc EPs.
*/
static unsigned int dwc2_gadget_get_xfersize_ddma(struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
unsigned int bytes_rem = 0;
struct dwc2_dma_desc *desc = hs_ep->desc_list;
int i;
u32 status;
if (!desc)
return -EINVAL;
for (i = 0; i < hs_ep->desc_count; ++i) {
status = desc->status;
bytes_rem += status & DEV_DMA_NBYTES_MASK;
if (status & DEV_DMA_STS_MASK)
dev_err(hsotg->dev, "descriptor %d closed with %x\n",
i, status & DEV_DMA_STS_MASK);
}
return bytes_rem;
}
/**
* dwc2_hsotg_handle_outdone - handle receiving OutDone/SetupDone from RXFIFO
* @hsotg: The device instance
* @epnum: The endpoint received from
*
* The RXFIFO has delivered an OutDone event, which means that the data
* transfer for an OUT endpoint has been completed, either by a short
* packet or by the finish of a transfer.
*/
static void dwc2_hsotg_handle_outdone(struct dwc2_hsotg *hsotg, int epnum)
{
u32 epsize = dwc2_readl(hsotg, DOEPTSIZ(epnum));
struct dwc2_hsotg_ep *hs_ep = hsotg->eps_out[epnum];
struct dwc2_hsotg_req *hs_req = hs_ep->req;
struct usb_request *req = &hs_req->req;
unsigned int size_left = DXEPTSIZ_XFERSIZE_GET(epsize);
int result = 0;
if (!hs_req) {
dev_dbg(hsotg->dev, "%s: no request active\n", __func__);
return;
}
if (epnum == 0 && hsotg->ep0_state == DWC2_EP0_STATUS_OUT) {
dev_dbg(hsotg->dev, "zlp packet received\n");
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
dwc2_hsotg_enqueue_setup(hsotg);
return;
}
if (using_desc_dma(hsotg))
size_left = dwc2_gadget_get_xfersize_ddma(hs_ep);
if (using_dma(hsotg)) {
unsigned int size_done;
/*
* Calculate the size of the transfer by checking how much
* is left in the endpoint size register and then working it
* out from the amount we loaded for the transfer.
*
* We need to do this as DMA pointers are always 32bit aligned
* so may overshoot/undershoot the transfer.
*/
size_done = hs_ep->size_loaded - size_left;
size_done += hs_ep->last_load;
req->actual = size_done;
}
/* if there is more request to do, schedule new transfer */
if (req->actual < req->length && size_left == 0) {
dwc2_hsotg_start_req(hsotg, hs_ep, hs_req, true);
return;
}
if (req->actual < req->length && req->short_not_ok) {
dev_dbg(hsotg->dev, "%s: got %d/%d (short not ok) => error\n",
__func__, req->actual, req->length);
/*
* todo - what should we return here? there's no one else
* even bothering to check the status.
*/
}
/* DDMA IN status phase will start from StsPhseRcvd interrupt */
if (!using_desc_dma(hsotg) && epnum == 0 &&
hsotg->ep0_state == DWC2_EP0_DATA_OUT) {
/* Move to STATUS IN */
dwc2_hsotg_ep0_zlp(hsotg, true);
return;
}
/*
* Slave mode OUT transfers do not go through XferComplete so
* adjust the ISOC parity here.
*/
if (!using_dma(hsotg)) {
if (hs_ep->isochronous && hs_ep->interval == 1)
dwc2_hsotg_change_ep_iso_parity(hsotg, DOEPCTL(epnum));
else if (hs_ep->isochronous && hs_ep->interval > 1)
dwc2_gadget_incr_frame_num(hs_ep);
}
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, result);
}
/**
* dwc2_hsotg_handle_rx - RX FIFO has data
* @hsotg: The device instance
*
* The IRQ handler has detected that the RX FIFO has some data in it
* that requires processing, so find out what is in there and do the
* appropriate read.
*
* The RXFIFO is a true FIFO, the packets coming out are still in packet
* chunks, so if you have x packets received on an endpoint you'll get x
* FIFO events delivered, each with a packet's worth of data in it.
*
* When using DMA, we should not be processing events from the RXFIFO
* as the actual data should be sent to the memory directly and we turn
* on the completion interrupts to get notifications of transfer completion.
*/
static void dwc2_hsotg_handle_rx(struct dwc2_hsotg *hsotg)
{
u32 grxstsr = dwc2_readl(hsotg, GRXSTSP);
u32 epnum, status, size;
WARN_ON(using_dma(hsotg));
epnum = grxstsr & GRXSTS_EPNUM_MASK;
status = grxstsr & GRXSTS_PKTSTS_MASK;
size = grxstsr & GRXSTS_BYTECNT_MASK;
size >>= GRXSTS_BYTECNT_SHIFT;
dev_dbg(hsotg->dev, "%s: GRXSTSP=0x%08x (%d@%d)\n",
__func__, grxstsr, size, epnum);
switch ((status & GRXSTS_PKTSTS_MASK) >> GRXSTS_PKTSTS_SHIFT) {
case GRXSTS_PKTSTS_GLOBALOUTNAK:
dev_dbg(hsotg->dev, "GLOBALOUTNAK\n");
break;
case GRXSTS_PKTSTS_OUTDONE:
dev_dbg(hsotg->dev, "OutDone (Frame=0x%08x)\n",
dwc2_hsotg_read_frameno(hsotg));
if (!using_dma(hsotg))
dwc2_hsotg_handle_outdone(hsotg, epnum);
break;
case GRXSTS_PKTSTS_SETUPDONE:
dev_dbg(hsotg->dev,
"SetupDone (Frame=0x%08x, DOPEPCTL=0x%08x)\n",
dwc2_hsotg_read_frameno(hsotg),
dwc2_readl(hsotg, DOEPCTL(0)));
/*
* Call dwc2_hsotg_handle_outdone here if it was not called from
* GRXSTS_PKTSTS_OUTDONE. That is, if the core didn't
* generate GRXSTS_PKTSTS_OUTDONE for setup packet.
*/
if (hsotg->ep0_state == DWC2_EP0_SETUP)
dwc2_hsotg_handle_outdone(hsotg, epnum);
break;
case GRXSTS_PKTSTS_OUTRX:
dwc2_hsotg_rx_data(hsotg, epnum, size);
break;
case GRXSTS_PKTSTS_SETUPRX:
dev_dbg(hsotg->dev,
"SetupRX (Frame=0x%08x, DOPEPCTL=0x%08x)\n",
dwc2_hsotg_read_frameno(hsotg),
dwc2_readl(hsotg, DOEPCTL(0)));
WARN_ON(hsotg->ep0_state != DWC2_EP0_SETUP);
dwc2_hsotg_rx_data(hsotg, epnum, size);
break;
default:
dev_warn(hsotg->dev, "%s: unknown status %08x\n",
__func__, grxstsr);
dwc2_hsotg_dump(hsotg);
break;
}
}
/**
* dwc2_hsotg_ep0_mps - turn max packet size into register setting
* @mps: The maximum packet size in bytes.
*/
static u32 dwc2_hsotg_ep0_mps(unsigned int mps)
{
switch (mps) {
case 64:
return D0EPCTL_MPS_64;
case 32:
return D0EPCTL_MPS_32;
case 16:
return D0EPCTL_MPS_16;
case 8:
return D0EPCTL_MPS_8;
}
/* bad max packet size, warn and return invalid result */
WARN_ON(1);
return (u32)-1;
}
/**
* dwc2_hsotg_set_ep_maxpacket - set endpoint's max-packet field
* @hsotg: The driver state.
* @ep: The index number of the endpoint
* @mps: The maximum packet size in bytes
* @mc: The multicount value
* @dir_in: True if direction is in.
*
* Configure the maximum packet size for the given endpoint, updating
* the hardware control registers to reflect this.
*/
static void dwc2_hsotg_set_ep_maxpacket(struct dwc2_hsotg *hsotg,
unsigned int ep, unsigned int mps,
unsigned int mc, unsigned int dir_in)
{
struct dwc2_hsotg_ep *hs_ep;
u32 reg;
hs_ep = index_to_ep(hsotg, ep, dir_in);
if (!hs_ep)
return;
if (ep == 0) {
u32 mps_bytes = mps;
/* EP0 is a special case */
mps = dwc2_hsotg_ep0_mps(mps_bytes);
if (mps > 3)
goto bad_mps;
hs_ep->ep.maxpacket = mps_bytes;
hs_ep->mc = 1;
} else {
if (mps > 1024)
goto bad_mps;
hs_ep->mc = mc;
if (mc > 3)
goto bad_mps;
hs_ep->ep.maxpacket = mps;
}
if (dir_in) {
reg = dwc2_readl(hsotg, DIEPCTL(ep));
reg &= ~DXEPCTL_MPS_MASK;
reg |= mps;
dwc2_writel(hsotg, reg, DIEPCTL(ep));
} else {
reg = dwc2_readl(hsotg, DOEPCTL(ep));
reg &= ~DXEPCTL_MPS_MASK;
reg |= mps;
dwc2_writel(hsotg, reg, DOEPCTL(ep));
}
return;
bad_mps:
dev_err(hsotg->dev, "ep%d: bad mps of %d\n", ep, mps);
}
/**
* dwc2_hsotg_txfifo_flush - flush Tx FIFO
* @hsotg: The driver state
* @idx: The index for the endpoint (0..15)
*/
static void dwc2_hsotg_txfifo_flush(struct dwc2_hsotg *hsotg, unsigned int idx)
{
dwc2_writel(hsotg, GRSTCTL_TXFNUM(idx) | GRSTCTL_TXFFLSH,
GRSTCTL);
/* wait until the fifo is flushed */
if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_TXFFLSH, 100))
dev_warn(hsotg->dev, "%s: timeout flushing fifo GRSTCTL_TXFFLSH\n",
__func__);
}
/**
* dwc2_hsotg_trytx - check to see if anything needs transmitting
* @hsotg: The driver state
* @hs_ep: The driver endpoint to check.
*
* Check to see if there is a request that has data to send, and if so
* make an attempt to write data into the FIFO.
*/
static int dwc2_hsotg_trytx(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg_req *hs_req = hs_ep->req;
if (!hs_ep->dir_in || !hs_req) {
/**
* if request is not enqueued, we disable interrupts
* for endpoints, excepting ep0
*/
if (hs_ep->index != 0)
dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index,
hs_ep->dir_in, 0);
return 0;
}
if (hs_req->req.actual < hs_req->req.length) {
dev_dbg(hsotg->dev, "trying to write more for ep%d\n",
hs_ep->index);
return dwc2_hsotg_write_fifo(hsotg, hs_ep, hs_req);
}
return 0;
}
/**
* dwc2_hsotg_complete_in - complete IN transfer
* @hsotg: The device state.
* @hs_ep: The endpoint that has just completed.
*
* An IN transfer has been completed, update the transfer's state and then
* call the relevant completion routines.
*/
static void dwc2_hsotg_complete_in(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg_req *hs_req = hs_ep->req;
u32 epsize = dwc2_readl(hsotg, DIEPTSIZ(hs_ep->index));
int size_left, size_done;
if (!hs_req) {
dev_dbg(hsotg->dev, "XferCompl but no req\n");
return;
}
/* Finish ZLP handling for IN EP0 transactions */
if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_STATUS_IN) {
dev_dbg(hsotg->dev, "zlp packet sent\n");
/*
* While send zlp for DWC2_EP0_STATUS_IN EP direction was
* changed to IN. Change back to complete OUT transfer request
*/
hs_ep->dir_in = 0;
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
if (hsotg->test_mode) {
int ret;
ret = dwc2_hsotg_set_test_mode(hsotg, hsotg->test_mode);
if (ret < 0) {
dev_dbg(hsotg->dev, "Invalid Test #%d\n",
hsotg->test_mode);
dwc2_hsotg_stall_ep0(hsotg);
return;
}
}
dwc2_hsotg_enqueue_setup(hsotg);
return;
}
/*
* Calculate the size of the transfer by checking how much is left
* in the endpoint size register and then working it out from
* the amount we loaded for the transfer.
*
* We do this even for DMA, as the transfer may have incremented
* past the end of the buffer (DMA transfers are always 32bit
* aligned).
*/
if (using_desc_dma(hsotg)) {
size_left = dwc2_gadget_get_xfersize_ddma(hs_ep);
if (size_left < 0)
dev_err(hsotg->dev, "error parsing DDMA results %d\n",
size_left);
} else {
size_left = DXEPTSIZ_XFERSIZE_GET(epsize);
}
size_done = hs_ep->size_loaded - size_left;
size_done += hs_ep->last_load;
if (hs_req->req.actual != size_done)
dev_dbg(hsotg->dev, "%s: adjusting size done %d => %d\n",
__func__, hs_req->req.actual, size_done);
hs_req->req.actual = size_done;
dev_dbg(hsotg->dev, "req->length:%d req->actual:%d req->zero:%d\n",
hs_req->req.length, hs_req->req.actual, hs_req->req.zero);
if (!size_left && hs_req->req.actual < hs_req->req.length) {
dev_dbg(hsotg->dev, "%s trying more for req...\n", __func__);
dwc2_hsotg_start_req(hsotg, hs_ep, hs_req, true);
return;
}
/* Zlp for all endpoints, for ep0 only in DATA IN stage */
if (hs_ep->send_zlp) {
dwc2_hsotg_program_zlp(hsotg, hs_ep);
hs_ep->send_zlp = 0;
/* transfer will be completed on next complete interrupt */
return;
}
if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_DATA_IN) {
/* Move to STATUS OUT */
dwc2_hsotg_ep0_zlp(hsotg, false);
return;
}
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
}
/**
* dwc2_gadget_read_ep_interrupts - reads interrupts for given ep
* @hsotg: The device state.
* @idx: Index of ep.
* @dir_in: Endpoint direction 1-in 0-out.
*
* Reads for endpoint with given index and direction, by masking
* epint_reg with coresponding mask.
*/
static u32 dwc2_gadget_read_ep_interrupts(struct dwc2_hsotg *hsotg,
unsigned int idx, int dir_in)
{
u32 epmsk_reg = dir_in ? DIEPMSK : DOEPMSK;
u32 epint_reg = dir_in ? DIEPINT(idx) : DOEPINT(idx);
u32 ints;
u32 mask;
u32 diepempmsk;
mask = dwc2_readl(hsotg, epmsk_reg);
diepempmsk = dwc2_readl(hsotg, DIEPEMPMSK);
mask |= ((diepempmsk >> idx) & 0x1) ? DIEPMSK_TXFIFOEMPTY : 0;
mask |= DXEPINT_SETUP_RCVD;
ints = dwc2_readl(hsotg, epint_reg);
ints &= mask;
return ints;
}
/**
* dwc2_gadget_handle_ep_disabled - handle DXEPINT_EPDISBLD
* @hs_ep: The endpoint on which interrupt is asserted.
*
* This interrupt indicates that the endpoint has been disabled per the
* application's request.
*
* For IN endpoints flushes txfifo, in case of BULK clears DCTL_CGNPINNAK,
* in case of ISOC completes current request.
*
* For ISOC-OUT endpoints completes expired requests. If there is remaining
* request starts it.
*/
static void dwc2_gadget_handle_ep_disabled(struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
struct dwc2_hsotg_req *hs_req;
unsigned char idx = hs_ep->index;
int dir_in = hs_ep->dir_in;
u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx);
int dctl = dwc2_readl(hsotg, DCTL);
dev_dbg(hsotg->dev, "%s: EPDisbld\n", __func__);
if (dir_in) {
int epctl = dwc2_readl(hsotg, epctl_reg);
dwc2_hsotg_txfifo_flush(hsotg, hs_ep->fifo_index);
if (hs_ep->isochronous) {
dwc2_hsotg_complete_in(hsotg, hs_ep);
return;
}
if ((epctl & DXEPCTL_STALL) && (epctl & DXEPCTL_EPTYPE_BULK)) {
int dctl = dwc2_readl(hsotg, DCTL);
dctl |= DCTL_CGNPINNAK;
dwc2_writel(hsotg, dctl, DCTL);
}
return;
}
if (dctl & DCTL_GOUTNAKSTS) {
dctl |= DCTL_CGOUTNAK;
dwc2_writel(hsotg, dctl, DCTL);
}
if (!hs_ep->isochronous)
return;
if (list_empty(&hs_ep->queue)) {
dev_dbg(hsotg->dev, "%s: complete_ep 0x%p, ep->queue empty!\n",
__func__, hs_ep);
return;
}
do {
hs_req = get_ep_head(hs_ep);
if (hs_req)
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req,
-ENODATA);
dwc2_gadget_incr_frame_num(hs_ep);
/* Update current frame number value. */
hsotg->frame_number = dwc2_hsotg_read_frameno(hsotg);
} while (dwc2_gadget_target_frame_elapsed(hs_ep));
dwc2_gadget_start_next_request(hs_ep);
}
/**
* dwc2_gadget_handle_out_token_ep_disabled - handle DXEPINT_OUTTKNEPDIS
* @ep: The endpoint on which interrupt is asserted.
*
* This is starting point for ISOC-OUT transfer, synchronization done with
* first out token received from host while corresponding EP is disabled.
*
* Device does not know initial frame in which out token will come. For this
* HW generates OUTTKNEPDIS - out token is received while EP is disabled. Upon
* getting this interrupt SW starts calculation for next transfer frame.
*/
static void dwc2_gadget_handle_out_token_ep_disabled(struct dwc2_hsotg_ep *ep)
{
struct dwc2_hsotg *hsotg = ep->parent;
int dir_in = ep->dir_in;
u32 doepmsk;
if (dir_in || !ep->isochronous)
return;
if (using_desc_dma(hsotg)) {
if (ep->target_frame == TARGET_FRAME_INITIAL) {
/* Start first ISO Out */
ep->target_frame = hsotg->frame_number;
dwc2_gadget_start_isoc_ddma(ep);
}
return;
}
if (ep->interval > 1 &&
ep->target_frame == TARGET_FRAME_INITIAL) {
u32 ctrl;
ep->target_frame = hsotg->frame_number;
dwc2_gadget_incr_frame_num(ep);
ctrl = dwc2_readl(hsotg, DOEPCTL(ep->index));
if (ep->target_frame & 0x1)
ctrl |= DXEPCTL_SETODDFR;
else
ctrl |= DXEPCTL_SETEVENFR;
dwc2_writel(hsotg, ctrl, DOEPCTL(ep->index));
}
dwc2_gadget_start_next_request(ep);
doepmsk = dwc2_readl(hsotg, DOEPMSK);
doepmsk &= ~DOEPMSK_OUTTKNEPDISMSK;
dwc2_writel(hsotg, doepmsk, DOEPMSK);
}
/**
* dwc2_gadget_handle_nak - handle NAK interrupt
* @hs_ep: The endpoint on which interrupt is asserted.
*
* This is starting point for ISOC-IN transfer, synchronization done with
* first IN token received from host while corresponding EP is disabled.
*
* Device does not know when first one token will arrive from host. On first
* token arrival HW generates 2 interrupts: 'in token received while FIFO empty'
* and 'NAK'. NAK interrupt for ISOC-IN means that token has arrived and ZLP was
* sent in response to that as there was no data in FIFO. SW is basing on this
* interrupt to obtain frame in which token has come and then based on the
* interval calculates next frame for transfer.
*/
static void dwc2_gadget_handle_nak(struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
int dir_in = hs_ep->dir_in;
if (!dir_in || !hs_ep->isochronous)
return;
if (hs_ep->target_frame == TARGET_FRAME_INITIAL) {
if (using_desc_dma(hsotg)) {
hs_ep->target_frame = hsotg->frame_number;
dwc2_gadget_incr_frame_num(hs_ep);
dwc2_gadget_start_isoc_ddma(hs_ep);
return;
}
hs_ep->target_frame = hsotg->frame_number;
if (hs_ep->interval > 1) {
u32 ctrl = dwc2_readl(hsotg,
DIEPCTL(hs_ep->index));
if (hs_ep->target_frame & 0x1)
ctrl |= DXEPCTL_SETODDFR;
else
ctrl |= DXEPCTL_SETEVENFR;
dwc2_writel(hsotg, ctrl, DIEPCTL(hs_ep->index));
}
dwc2_hsotg_complete_request(hsotg, hs_ep,
get_ep_head(hs_ep), 0);
}
if (!using_desc_dma(hsotg))
dwc2_gadget_incr_frame_num(hs_ep);
}
/**
* dwc2_hsotg_epint - handle an in/out endpoint interrupt
* @hsotg: The driver state
* @idx: The index for the endpoint (0..15)
* @dir_in: Set if this is an IN endpoint
*
* Process and clear any interrupt pending for an individual endpoint
*/
static void dwc2_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx,
int dir_in)
{
struct dwc2_hsotg_ep *hs_ep = index_to_ep(hsotg, idx, dir_in);
u32 epint_reg = dir_in ? DIEPINT(idx) : DOEPINT(idx);
u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx);
u32 epsiz_reg = dir_in ? DIEPTSIZ(idx) : DOEPTSIZ(idx);
u32 ints;
u32 ctrl;
ints = dwc2_gadget_read_ep_interrupts(hsotg, idx, dir_in);
ctrl = dwc2_readl(hsotg, epctl_reg);
/* Clear endpoint interrupts */
dwc2_writel(hsotg, ints, epint_reg);
if (!hs_ep) {
dev_err(hsotg->dev, "%s:Interrupt for unconfigured ep%d(%s)\n",
__func__, idx, dir_in ? "in" : "out");
return;
}
dev_dbg(hsotg->dev, "%s: ep%d(%s) DxEPINT=0x%08x\n",
__func__, idx, dir_in ? "in" : "out", ints);
/* Don't process XferCompl interrupt if it is a setup packet */
if (idx == 0 && (ints & (DXEPINT_SETUP | DXEPINT_SETUP_RCVD)))
ints &= ~DXEPINT_XFERCOMPL;
/*
* Don't process XferCompl interrupt in DDMA if EP0 is still in SETUP
* stage and xfercomplete was generated without SETUP phase done
* interrupt. SW should parse received setup packet only after host's
* exit from setup phase of control transfer.
*/
if (using_desc_dma(hsotg) && idx == 0 && !hs_ep->dir_in &&
hsotg->ep0_state == DWC2_EP0_SETUP && !(ints & DXEPINT_SETUP))
ints &= ~DXEPINT_XFERCOMPL;
if (ints & DXEPINT_XFERCOMPL) {
dev_dbg(hsotg->dev,
"%s: XferCompl: DxEPCTL=0x%08x, DXEPTSIZ=%08x\n",
__func__, dwc2_readl(hsotg, epctl_reg),
dwc2_readl(hsotg, epsiz_reg));
/* In DDMA handle isochronous requests separately */
if (using_desc_dma(hsotg) && hs_ep->isochronous) {
/* XferCompl set along with BNA */
if (!(ints & DXEPINT_BNAINTR))
dwc2_gadget_complete_isoc_request_ddma(hs_ep);
} else if (dir_in) {
/*
* We get OutDone from the FIFO, so we only
* need to look at completing IN requests here
* if operating slave mode
*/
if (hs_ep->isochronous && hs_ep->interval > 1)
dwc2_gadget_incr_frame_num(hs_ep);
dwc2_hsotg_complete_in(hsotg, hs_ep);
if (ints & DXEPINT_NAKINTRPT)
ints &= ~DXEPINT_NAKINTRPT;
if (idx == 0 && !hs_ep->req)
dwc2_hsotg_enqueue_setup(hsotg);
} else if (using_dma(hsotg)) {
/*
* We're using DMA, we need to fire an OutDone here
* as we ignore the RXFIFO.
*/
if (hs_ep->isochronous && hs_ep->interval > 1)
dwc2_gadget_incr_frame_num(hs_ep);
dwc2_hsotg_handle_outdone(hsotg, idx);
}
}
if (ints & DXEPINT_EPDISBLD)
dwc2_gadget_handle_ep_disabled(hs_ep);
if (ints & DXEPINT_OUTTKNEPDIS)
dwc2_gadget_handle_out_token_ep_disabled(hs_ep);
if (ints & DXEPINT_NAKINTRPT)
dwc2_gadget_handle_nak(hs_ep);
if (ints & DXEPINT_AHBERR)
dev_dbg(hsotg->dev, "%s: AHBErr\n", __func__);
if (ints & DXEPINT_SETUP) { /* Setup or Timeout */
dev_dbg(hsotg->dev, "%s: Setup/Timeout\n", __func__);
if (using_dma(hsotg) && idx == 0) {
/*
* this is the notification we've received a
* setup packet. In non-DMA mode we'd get this
* from the RXFIFO, instead we need to process
* the setup here.
*/
if (dir_in)
WARN_ON_ONCE(1);
else
dwc2_hsotg_handle_outdone(hsotg, 0);
}
}
if (ints & DXEPINT_STSPHSERCVD) {
dev_dbg(hsotg->dev, "%s: StsPhseRcvd\n", __func__);
/* Safety check EP0 state when STSPHSERCVD asserted */
if (hsotg->ep0_state == DWC2_EP0_DATA_OUT) {
/* Move to STATUS IN for DDMA */
if (using_desc_dma(hsotg))
dwc2_hsotg_ep0_zlp(hsotg, true);
}
}
if (ints & DXEPINT_BACK2BACKSETUP)
dev_dbg(hsotg->dev, "%s: B2BSetup/INEPNakEff\n", __func__);
if (ints & DXEPINT_BNAINTR) {
dev_dbg(hsotg->dev, "%s: BNA interrupt\n", __func__);
if (hs_ep->isochronous)
dwc2_gadget_handle_isoc_bna(hs_ep);
}
if (dir_in && !hs_ep->isochronous) {
/* not sure if this is important, but we'll clear it anyway */
if (ints & DXEPINT_INTKNTXFEMP) {
dev_dbg(hsotg->dev, "%s: ep%d: INTknTXFEmpMsk\n",
__func__, idx);
}
/* this probably means something bad is happening */
if (ints & DXEPINT_INTKNEPMIS) {
dev_warn(hsotg->dev, "%s: ep%d: INTknEP\n",
__func__, idx);
}
/* FIFO has space or is empty (see GAHBCFG) */
if (hsotg->dedicated_fifos &&
ints & DXEPINT_TXFEMP) {
dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n",
__func__, idx);
if (!using_dma(hsotg))
dwc2_hsotg_trytx(hsotg, hs_ep);
}
}
}
/**
* dwc2_hsotg_irq_enumdone - Handle EnumDone interrupt (enumeration done)
* @hsotg: The device state.
*
* Handle updating the device settings after the enumeration phase has
* been completed.
*/
static void dwc2_hsotg_irq_enumdone(struct dwc2_hsotg *hsotg)
{
u32 dsts = dwc2_readl(hsotg, DSTS);
int ep0_mps = 0, ep_mps = 8;
/*
* This should signal the finish of the enumeration phase
* of the USB handshaking, so we should now know what rate
* we connected at.
*/
dev_dbg(hsotg->dev, "EnumDone (DSTS=0x%08x)\n", dsts);
/*
* note, since we're limited by the size of transfer on EP0, and
* it seems IN transfers must be a even number of packets we do
* not advertise a 64byte MPS on EP0.
*/
/* catch both EnumSpd_FS and EnumSpd_FS48 */
switch ((dsts & DSTS_ENUMSPD_MASK) >> DSTS_ENUMSPD_SHIFT) {
case DSTS_ENUMSPD_FS:
case DSTS_ENUMSPD_FS48:
hsotg->gadget.speed = USB_SPEED_FULL;
ep0_mps = EP0_MPS_LIMIT;
ep_mps = 1023;
break;
case DSTS_ENUMSPD_HS:
hsotg->gadget.speed = USB_SPEED_HIGH;
ep0_mps = EP0_MPS_LIMIT;
ep_mps = 1024;
break;
case DSTS_ENUMSPD_LS:
hsotg->gadget.speed = USB_SPEED_LOW;
ep0_mps = 8;
ep_mps = 8;
/*
* note, we don't actually support LS in this driver at the
* moment, and the documentation seems to imply that it isn't
* supported by the PHYs on some of the devices.
*/
break;
}
dev_info(hsotg->dev, "new device is %s\n",
usb_speed_string(hsotg->gadget.speed));
/*
* we should now know the maximum packet size for an
* endpoint, so set the endpoints to a default value.
*/
if (ep0_mps) {
int i;
/* Initialize ep0 for both in and out directions */
dwc2_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps, 0, 1);
dwc2_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps, 0, 0);
for (i = 1; i < hsotg->num_of_eps; i++) {
if (hsotg->eps_in[i])
dwc2_hsotg_set_ep_maxpacket(hsotg, i, ep_mps,
0, 1);
if (hsotg->eps_out[i])
dwc2_hsotg_set_ep_maxpacket(hsotg, i, ep_mps,
0, 0);
}
}
/* ensure after enumeration our EP0 is active */
dwc2_hsotg_enqueue_setup(hsotg);
dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
dwc2_readl(hsotg, DIEPCTL0),
dwc2_readl(hsotg, DOEPCTL0));
}
/**
* kill_all_requests - remove all requests from the endpoint's queue
* @hsotg: The device state.
* @ep: The endpoint the requests may be on.
* @result: The result code to use.
*
* Go through the requests on the given endpoint and mark them
* completed with the given result code.
*/
static void kill_all_requests(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *ep,
int result)
{
struct dwc2_hsotg_req *req, *treq;
unsigned int size;
ep->req = NULL;
list_for_each_entry_safe(req, treq, &ep->queue, queue)
dwc2_hsotg_complete_request(hsotg, ep, req,
result);
if (!hsotg->dedicated_fifos)
return;
size = (dwc2_readl(hsotg, DTXFSTS(ep->fifo_index)) & 0xffff) * 4;
if (size < ep->fifo_size)
dwc2_hsotg_txfifo_flush(hsotg, ep->fifo_index);
}
/**
* dwc2_hsotg_disconnect - disconnect service
* @hsotg: The device state.
*
* The device has been disconnected. Remove all current
* transactions and signal the gadget driver that this
* has happened.
*/
void dwc2_hsotg_disconnect(struct dwc2_hsotg *hsotg)
{
unsigned int ep;
if (!hsotg->connected)
return;
hsotg->connected = 0;
hsotg->test_mode = 0;
for (ep = 0; ep < hsotg->num_of_eps; ep++) {
if (hsotg->eps_in[ep])
kill_all_requests(hsotg, hsotg->eps_in[ep],
-ESHUTDOWN);
if (hsotg->eps_out[ep])
kill_all_requests(hsotg, hsotg->eps_out[ep],
-ESHUTDOWN);
}
call_gadget(hsotg, disconnect);
hsotg->lx_state = DWC2_L3;
usb_gadget_set_state(&hsotg->gadget, USB_STATE_NOTATTACHED);
}
/**
* dwc2_hsotg_irq_fifoempty - TX FIFO empty interrupt handler
* @hsotg: The device state:
* @periodic: True if this is a periodic FIFO interrupt
*/
static void dwc2_hsotg_irq_fifoempty(struct dwc2_hsotg *hsotg, bool periodic)
{
struct dwc2_hsotg_ep *ep;
int epno, ret;
/* look through for any more data to transmit */
for (epno = 0; epno < hsotg->num_of_eps; epno++) {
ep = index_to_ep(hsotg, epno, 1);
if (!ep)
continue;
if (!ep->dir_in)
continue;
if ((periodic && !ep->periodic) ||
(!periodic && ep->periodic))
continue;
ret = dwc2_hsotg_trytx(hsotg, ep);
if (ret < 0)
break;
}
}
/* IRQ flags which will trigger a retry around the IRQ loop */
#define IRQ_RETRY_MASK (GINTSTS_NPTXFEMP | \
GINTSTS_PTXFEMP | \
GINTSTS_RXFLVL)
/**
* dwc2_hsotg_core_init - issue softreset to the core
* @hsotg: The device state
* @is_usb_reset: Usb resetting flag
*
* Issue a soft reset to the core, and await the core finishing it.
*/
void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg,
bool is_usb_reset)
{
u32 intmsk;
u32 val;
u32 usbcfg;
u32 dcfg = 0;
/* Kill any ep0 requests as controller will be reinitialized */
kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET);
if (!is_usb_reset)
if (dwc2_core_reset(hsotg, true))
return;
/*
* we must now enable ep0 ready for host detection and then
* set configuration.
*/
/* keep other bits untouched (so e.g. forced modes are not lost) */
usbcfg = dwc2_readl(hsotg, GUSBCFG);
usbcfg &= ~(GUSBCFG_TOUTCAL_MASK | GUSBCFG_PHYIF16 | GUSBCFG_SRPCAP |
GUSBCFG_HNPCAP | GUSBCFG_USBTRDTIM_MASK);
if (hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS &&
(hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
hsotg->params.speed == DWC2_SPEED_PARAM_LOW)) {
/* FS/LS Dedicated Transceiver Interface */
usbcfg |= GUSBCFG_PHYSEL;
} else {
/* set the PLL on, remove the HNP/SRP and set the PHY */
val = (hsotg->phyif == GUSBCFG_PHYIF8) ? 9 : 5;
usbcfg |= hsotg->phyif | GUSBCFG_TOUTCAL(7) |
(val << GUSBCFG_USBTRDTIM_SHIFT);
}
dwc2_writel(hsotg, usbcfg, GUSBCFG);
dwc2_hsotg_init_fifo(hsotg);
if (!is_usb_reset)
dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON);
dcfg |= DCFG_EPMISCNT(1);
switch (hsotg->params.speed) {
case DWC2_SPEED_PARAM_LOW:
dcfg |= DCFG_DEVSPD_LS;
break;
case DWC2_SPEED_PARAM_FULL:
if (hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS)
dcfg |= DCFG_DEVSPD_FS48;
else
dcfg |= DCFG_DEVSPD_FS;
break;
default:
dcfg |= DCFG_DEVSPD_HS;
}
if (hsotg->params.ipg_isoc_en)
dcfg |= DCFG_IPG_ISOC_SUPPORDED;
dwc2_writel(hsotg, dcfg, DCFG);
/* Clear any pending OTG interrupts */
dwc2_writel(hsotg, 0xffffffff, GOTGINT);
/* Clear any pending interrupts */
dwc2_writel(hsotg, 0xffffffff, GINTSTS);
intmsk = GINTSTS_ERLYSUSP | GINTSTS_SESSREQINT |
GINTSTS_GOUTNAKEFF | GINTSTS_GINNAKEFF |
GINTSTS_USBRST | GINTSTS_RESETDET |
GINTSTS_ENUMDONE | GINTSTS_OTGINT |
GINTSTS_USBSUSP | GINTSTS_WKUPINT |
GINTSTS_LPMTRANRCVD;
if (!using_desc_dma(hsotg))
intmsk |= GINTSTS_INCOMPL_SOIN | GINTSTS_INCOMPL_SOOUT;
if (!hsotg->params.external_id_pin_ctl)
intmsk |= GINTSTS_CONIDSTSCHNG;
dwc2_writel(hsotg, intmsk, GINTMSK);
if (using_dma(hsotg)) {
dwc2_writel(hsotg, GAHBCFG_GLBL_INTR_EN | GAHBCFG_DMA_EN |
hsotg->params.ahbcfg,
GAHBCFG);
/* Set DDMA mode support in the core if needed */
if (using_desc_dma(hsotg))
dwc2_set_bit(hsotg, DCFG, DCFG_DESCDMA_EN);
} else {
dwc2_writel(hsotg, ((hsotg->dedicated_fifos) ?
(GAHBCFG_NP_TXF_EMP_LVL |
GAHBCFG_P_TXF_EMP_LVL) : 0) |
GAHBCFG_GLBL_INTR_EN, GAHBCFG);
}
/*
* If INTknTXFEmpMsk is enabled, it's important to disable ep interrupts
* when we have no data to transfer. Otherwise we get being flooded by
* interrupts.
*/
dwc2_writel(hsotg, ((hsotg->dedicated_fifos && !using_dma(hsotg)) ?
DIEPMSK_TXFIFOEMPTY | DIEPMSK_INTKNTXFEMPMSK : 0) |
DIEPMSK_EPDISBLDMSK | DIEPMSK_XFERCOMPLMSK |
DIEPMSK_TIMEOUTMSK | DIEPMSK_AHBERRMSK,
DIEPMSK);
/*
* don't need XferCompl, we get that from RXFIFO in slave mode. In
* DMA mode we may need this and StsPhseRcvd.
*/
dwc2_writel(hsotg, (using_dma(hsotg) ? (DIEPMSK_XFERCOMPLMSK |
DOEPMSK_STSPHSERCVDMSK) : 0) |
DOEPMSK_EPDISBLDMSK | DOEPMSK_AHBERRMSK |
DOEPMSK_SETUPMSK,
DOEPMSK);
/* Enable BNA interrupt for DDMA */
if (using_desc_dma(hsotg)) {
dwc2_set_bit(hsotg, DOEPMSK, DOEPMSK_BNAMSK);
dwc2_set_bit(hsotg, DIEPMSK, DIEPMSK_BNAININTRMSK);
}
dwc2_writel(hsotg, 0, DAINTMSK);
dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
dwc2_readl(hsotg, DIEPCTL0),
dwc2_readl(hsotg, DOEPCTL0));
/* enable in and out endpoint interrupts */
dwc2_hsotg_en_gsint(hsotg, GINTSTS_OEPINT | GINTSTS_IEPINT);
/*
* Enable the RXFIFO when in slave mode, as this is how we collect
* the data. In DMA mode, we get events from the FIFO but also
* things we cannot process, so do not use it.
*/
if (!using_dma(hsotg))
dwc2_hsotg_en_gsint(hsotg, GINTSTS_RXFLVL);
/* Enable interrupts for EP0 in and out */
dwc2_hsotg_ctrl_epint(hsotg, 0, 0, 1);
dwc2_hsotg_ctrl_epint(hsotg, 0, 1, 1);
if (!is_usb_reset) {
dwc2_set_bit(hsotg, DCTL, DCTL_PWRONPRGDONE);
udelay(10); /* see openiboot */
dwc2_clear_bit(hsotg, DCTL, DCTL_PWRONPRGDONE);
}
dev_dbg(hsotg->dev, "DCTL=0x%08x\n", dwc2_readl(hsotg, DCTL));
/*
* DxEPCTL_USBActEp says RO in manual, but seems to be set by
* writing to the EPCTL register..
*/
/* set to read 1 8byte packet */
dwc2_writel(hsotg, DXEPTSIZ_MC(1) | DXEPTSIZ_PKTCNT(1) |
DXEPTSIZ_XFERSIZE(8), DOEPTSIZ0);
dwc2_writel(hsotg, dwc2_hsotg_ep0_mps(hsotg->eps_out[0]->ep.maxpacket) |
DXEPCTL_CNAK | DXEPCTL_EPENA |
DXEPCTL_USBACTEP,
DOEPCTL0);
/* enable, but don't activate EP0in */
dwc2_writel(hsotg, dwc2_hsotg_ep0_mps(hsotg->eps_out[0]->ep.maxpacket) |
DXEPCTL_USBACTEP, DIEPCTL0);
/* clear global NAKs */
val = DCTL_CGOUTNAK | DCTL_CGNPINNAK;
if (!is_usb_reset)
val |= DCTL_SFTDISCON;
dwc2_set_bit(hsotg, DCTL, val);
/* configure the core to support LPM */
dwc2_gadget_init_lpm(hsotg);
/* must be at-least 3ms to allow bus to see disconnect */
mdelay(3);
hsotg->lx_state = DWC2_L0;
dwc2_hsotg_enqueue_setup(hsotg);
dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
dwc2_readl(hsotg, DIEPCTL0),
dwc2_readl(hsotg, DOEPCTL0));
}
static void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg)
{
/* set the soft-disconnect bit */
dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON);
}
void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg)
{
/* remove the soft-disconnect and let's go */
dwc2_clear_bit(hsotg, DCTL, DCTL_SFTDISCON);
}
/**
* dwc2_gadget_handle_incomplete_isoc_in - handle incomplete ISO IN Interrupt.
* @hsotg: The device state:
*
* This interrupt indicates one of the following conditions occurred while
* transmitting an ISOC transaction.
* - Corrupted IN Token for ISOC EP.
* - Packet not complete in FIFO.
*
* The following actions will be taken:
* - Determine the EP
* - Disable EP; when 'Endpoint Disabled' interrupt is received Flush FIFO
*/
static void dwc2_gadget_handle_incomplete_isoc_in(struct dwc2_hsotg *hsotg)
{
struct dwc2_hsotg_ep *hs_ep;
u32 epctrl;
u32 daintmsk;
u32 idx;
dev_dbg(hsotg->dev, "Incomplete isoc in interrupt received:\n");
daintmsk = dwc2_readl(hsotg, DAINTMSK);
for (idx = 1; idx < hsotg->num_of_eps; idx++) {
hs_ep = hsotg->eps_in[idx];
/* Proceed only unmasked ISOC EPs */
if ((BIT(idx) & ~daintmsk) || !hs_ep->isochronous)
continue;
epctrl = dwc2_readl(hsotg, DIEPCTL(idx));
if ((epctrl & DXEPCTL_EPENA) &&
dwc2_gadget_target_frame_elapsed(hs_ep)) {
epctrl |= DXEPCTL_SNAK;
epctrl |= DXEPCTL_EPDIS;
dwc2_writel(hsotg, epctrl, DIEPCTL(idx));
}
}
/* Clear interrupt */
dwc2_writel(hsotg, GINTSTS_INCOMPL_SOIN, GINTSTS);
}
/**
* dwc2_gadget_handle_incomplete_isoc_out - handle incomplete ISO OUT Interrupt
* @hsotg: The device state:
*
* This interrupt indicates one of the following conditions occurred while
* transmitting an ISOC transaction.
* - Corrupted OUT Token for ISOC EP.
* - Packet not complete in FIFO.
*
* The following actions will be taken:
* - Determine the EP
* - Set DCTL_SGOUTNAK and unmask GOUTNAKEFF if target frame elapsed.
*/
static void dwc2_gadget_handle_incomplete_isoc_out(struct dwc2_hsotg *hsotg)
{
u32 gintsts;
u32 gintmsk;
u32 daintmsk;
u32 epctrl;
struct dwc2_hsotg_ep *hs_ep;
int idx;
dev_dbg(hsotg->dev, "%s: GINTSTS_INCOMPL_SOOUT\n", __func__);
daintmsk = dwc2_readl(hsotg, DAINTMSK);
daintmsk >>= DAINT_OUTEP_SHIFT;
for (idx = 1; idx < hsotg->num_of_eps; idx++) {
hs_ep = hsotg->eps_out[idx];
/* Proceed only unmasked ISOC EPs */
if ((BIT(idx) & ~daintmsk) || !hs_ep->isochronous)
continue;
epctrl = dwc2_readl(hsotg, DOEPCTL(idx));
if ((epctrl & DXEPCTL_EPENA) &&
dwc2_gadget_target_frame_elapsed(hs_ep)) {
/* Unmask GOUTNAKEFF interrupt */
gintmsk = dwc2_readl(hsotg, GINTMSK);
gintmsk |= GINTSTS_GOUTNAKEFF;
dwc2_writel(hsotg, gintmsk, GINTMSK);
gintsts = dwc2_readl(hsotg, GINTSTS);
if (!(gintsts & GINTSTS_GOUTNAKEFF)) {
dwc2_set_bit(hsotg, DCTL, DCTL_SGOUTNAK);
break;
}
}
}
/* Clear interrupt */
dwc2_writel(hsotg, GINTSTS_INCOMPL_SOOUT, GINTSTS);
}
/**
* dwc2_hsotg_irq - handle device interrupt
* @irq: The IRQ number triggered
* @pw: The pw value when registered the handler.
*/
static irqreturn_t dwc2_hsotg_irq(int irq, void *pw)
{
struct dwc2_hsotg *hsotg = pw;
int retry_count = 8;
u32 gintsts;
u32 gintmsk;
if (!dwc2_is_device_mode(hsotg))
return IRQ_NONE;
spin_lock(&hsotg->lock);
irq_retry:
gintsts = dwc2_readl(hsotg, GINTSTS);
gintmsk = dwc2_readl(hsotg, GINTMSK);
dev_dbg(hsotg->dev, "%s: %08x %08x (%08x) retry %d\n",
__func__, gintsts, gintsts & gintmsk, gintmsk, retry_count);
gintsts &= gintmsk;
if (gintsts & GINTSTS_RESETDET) {
dev_dbg(hsotg->dev, "%s: USBRstDet\n", __func__);
dwc2_writel(hsotg, GINTSTS_RESETDET, GINTSTS);
/* This event must be used only if controller is suspended */
if (hsotg->lx_state == DWC2_L2) {
dwc2_exit_partial_power_down(hsotg, true);
hsotg->lx_state = DWC2_L0;
}
}
if (gintsts & (GINTSTS_USBRST | GINTSTS_RESETDET)) {
u32 usb_status = dwc2_readl(hsotg, GOTGCTL);
u32 connected = hsotg->connected;
dev_dbg(hsotg->dev, "%s: USBRst\n", __func__);
dev_dbg(hsotg->dev, "GNPTXSTS=%08x\n",
dwc2_readl(hsotg, GNPTXSTS));
dwc2_writel(hsotg, GINTSTS_USBRST, GINTSTS);
/* Report disconnection if it is not already done. */
dwc2_hsotg_disconnect(hsotg);
/* Reset device address to zero */
dwc2_clear_bit(hsotg, DCFG, DCFG_DEVADDR_MASK);
if (usb_status & GOTGCTL_BSESVLD && connected)
dwc2_hsotg_core_init_disconnected(hsotg, true);
}
if (gintsts & GINTSTS_ENUMDONE) {
dwc2_writel(hsotg, GINTSTS_ENUMDONE, GINTSTS);
dwc2_hsotg_irq_enumdone(hsotg);
}
if (gintsts & (GINTSTS_OEPINT | GINTSTS_IEPINT)) {
u32 daint = dwc2_readl(hsotg, DAINT);
u32 daintmsk = dwc2_readl(hsotg, DAINTMSK);
u32 daint_out, daint_in;
int ep;
daint &= daintmsk;
daint_out = daint >> DAINT_OUTEP_SHIFT;
daint_in = daint & ~(daint_out << DAINT_OUTEP_SHIFT);
dev_dbg(hsotg->dev, "%s: daint=%08x\n", __func__, daint);
for (ep = 0; ep < hsotg->num_of_eps && daint_out;
ep++, daint_out >>= 1) {
if (daint_out & 1)
dwc2_hsotg_epint(hsotg, ep, 0);
}
for (ep = 0; ep < hsotg->num_of_eps && daint_in;
ep++, daint_in >>= 1) {
if (daint_in & 1)
dwc2_hsotg_epint(hsotg, ep, 1);
}
}
/* check both FIFOs */
if (gintsts & GINTSTS_NPTXFEMP) {
dev_dbg(hsotg->dev, "NPTxFEmp\n");
/*
* Disable the interrupt to stop it happening again
* unless one of these endpoint routines decides that
* it needs re-enabling
*/
dwc2_hsotg_disable_gsint(hsotg, GINTSTS_NPTXFEMP);
dwc2_hsotg_irq_fifoempty(hsotg, false);
}
if (gintsts & GINTSTS_PTXFEMP) {
dev_dbg(hsotg->dev, "PTxFEmp\n");
/* See note in GINTSTS_NPTxFEmp */
dwc2_hsotg_disable_gsint(hsotg, GINTSTS_PTXFEMP);
dwc2_hsotg_irq_fifoempty(hsotg, true);
}
if (gintsts & GINTSTS_RXFLVL) {
/*
* note, since GINTSTS_RxFLvl doubles as FIFO-not-empty,
* we need to retry dwc2_hsotg_handle_rx if this is still
* set.
*/
dwc2_hsotg_handle_rx(hsotg);
}
if (gintsts & GINTSTS_ERLYSUSP) {
dev_dbg(hsotg->dev, "GINTSTS_ErlySusp\n");
dwc2_writel(hsotg, GINTSTS_ERLYSUSP, GINTSTS);
}
/*
* these next two seem to crop-up occasionally causing the core
* to shutdown the USB transfer, so try clearing them and logging
* the occurrence.
*/
if (gintsts & GINTSTS_GOUTNAKEFF) {
u8 idx;
u32 epctrl;
u32 gintmsk;
u32 daintmsk;
struct dwc2_hsotg_ep *hs_ep;
daintmsk = dwc2_readl(hsotg, DAINTMSK);
daintmsk >>= DAINT_OUTEP_SHIFT;
/* Mask this interrupt */
gintmsk = dwc2_readl(hsotg, GINTMSK);
gintmsk &= ~GINTSTS_GOUTNAKEFF;
dwc2_writel(hsotg, gintmsk, GINTMSK);
dev_dbg(hsotg->dev, "GOUTNakEff triggered\n");
for (idx = 1; idx < hsotg->num_of_eps; idx++) {
hs_ep = hsotg->eps_out[idx];
/* Proceed only unmasked ISOC EPs */
if ((BIT(idx) & ~daintmsk) || !hs_ep->isochronous)
continue;
epctrl = dwc2_readl(hsotg, DOEPCTL(idx));
if (epctrl & DXEPCTL_EPENA) {
epctrl |= DXEPCTL_SNAK;
epctrl |= DXEPCTL_EPDIS;
dwc2_writel(hsotg, epctrl, DOEPCTL(idx));
}
}
/* This interrupt bit is cleared in DXEPINT_EPDISBLD handler */
}
if (gintsts & GINTSTS_GINNAKEFF) {
dev_info(hsotg->dev, "GINNakEff triggered\n");
dwc2_set_bit(hsotg, DCTL, DCTL_CGNPINNAK);
dwc2_hsotg_dump(hsotg);
}
if (gintsts & GINTSTS_INCOMPL_SOIN)
dwc2_gadget_handle_incomplete_isoc_in(hsotg);
if (gintsts & GINTSTS_INCOMPL_SOOUT)
dwc2_gadget_handle_incomplete_isoc_out(hsotg);
/*
* if we've had fifo events, we should try and go around the
* loop again to see if there's any point in returning yet.
*/
if (gintsts & IRQ_RETRY_MASK && --retry_count > 0)
goto irq_retry;
spin_unlock(&hsotg->lock);
return IRQ_HANDLED;
}
static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep)
{
u32 epctrl_reg;
u32 epint_reg;
epctrl_reg = hs_ep->dir_in ? DIEPCTL(hs_ep->index) :
DOEPCTL(hs_ep->index);
epint_reg = hs_ep->dir_in ? DIEPINT(hs_ep->index) :
DOEPINT(hs_ep->index);
dev_dbg(hsotg->dev, "%s: stopping transfer on %s\n", __func__,
hs_ep->name);
if (hs_ep->dir_in) {
if (hsotg->dedicated_fifos || hs_ep->periodic) {
dwc2_set_bit(hsotg, epctrl_reg, DXEPCTL_SNAK);
/* Wait for Nak effect */
if (dwc2_hsotg_wait_bit_set(hsotg, epint_reg,
DXEPINT_INEPNAKEFF, 100))
dev_warn(hsotg->dev,
"%s: timeout DIEPINT.NAKEFF\n",
__func__);
} else {
dwc2_set_bit(hsotg, DCTL, DCTL_SGNPINNAK);
/* Wait for Nak effect */
if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS,
GINTSTS_GINNAKEFF, 100))
dev_warn(hsotg->dev,
"%s: timeout GINTSTS.GINNAKEFF\n",
__func__);
}
} else {
if (!(dwc2_readl(hsotg, GINTSTS) & GINTSTS_GOUTNAKEFF))
dwc2_set_bit(hsotg, DCTL, DCTL_SGOUTNAK);
/* Wait for global nak to take effect */
if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS,
GINTSTS_GOUTNAKEFF, 100))
dev_warn(hsotg->dev, "%s: timeout GINTSTS.GOUTNAKEFF\n",
__func__);
}
/* Disable ep */
dwc2_set_bit(hsotg, epctrl_reg, DXEPCTL_EPDIS | DXEPCTL_SNAK);
/* Wait for ep to be disabled */
if (dwc2_hsotg_wait_bit_set(hsotg, epint_reg, DXEPINT_EPDISBLD, 100))
dev_warn(hsotg->dev,
"%s: timeout DOEPCTL.EPDisable\n", __func__);
/* Clear EPDISBLD interrupt */
dwc2_set_bit(hsotg, epint_reg, DXEPINT_EPDISBLD);
if (hs_ep->dir_in) {
unsigned short fifo_index;
if (hsotg->dedicated_fifos || hs_ep->periodic)
fifo_index = hs_ep->fifo_index;
else
fifo_index = 0;
/* Flush TX FIFO */
dwc2_flush_tx_fifo(hsotg, fifo_index);
/* Clear Global In NP NAK in Shared FIFO for non periodic ep */
if (!hsotg->dedicated_fifos && !hs_ep->periodic)
dwc2_set_bit(hsotg, DCTL, DCTL_CGNPINNAK);
} else {
/* Remove global NAKs */
dwc2_set_bit(hsotg, DCTL, DCTL_CGOUTNAK);
}
}
/**
* dwc2_hsotg_ep_enable - enable the given endpoint
* @ep: The USB endpint to configure
* @desc: The USB endpoint descriptor to configure with.
*
* This is called from the USB gadget code's usb_ep_enable().
*/
static int dwc2_hsotg_ep_enable(struct usb_ep *ep,
const struct usb_endpoint_descriptor *desc)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hsotg = hs_ep->parent;
unsigned long flags;
unsigned int index = hs_ep->index;
u32 epctrl_reg;
u32 epctrl;
u32 mps;
u32 mc;
u32 mask;
unsigned int dir_in;
unsigned int i, val, size;
int ret = 0;
unsigned char ep_type;
dev_dbg(hsotg->dev,
"%s: ep %s: a 0x%02x, attr 0x%02x, mps 0x%04x, intr %d\n",
__func__, ep->name, desc->bEndpointAddress, desc->bmAttributes,
desc->wMaxPacketSize, desc->bInterval);
/* not to be called for EP0 */
if (index == 0) {
dev_err(hsotg->dev, "%s: called for EP 0\n", __func__);
return -EINVAL;
}
dir_in = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? 1 : 0;
if (dir_in != hs_ep->dir_in) {
dev_err(hsotg->dev, "%s: direction mismatch!\n", __func__);
return -EINVAL;
}
ep_type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
mps = usb_endpoint_maxp(desc);
mc = usb_endpoint_maxp_mult(desc);
/* ISOC IN in DDMA supported bInterval up to 10 */
if (using_desc_dma(hsotg) && ep_type == USB_ENDPOINT_XFER_ISOC &&
dir_in && desc->bInterval > 10) {
dev_err(hsotg->dev,
"%s: ISOC IN, DDMA: bInterval>10 not supported!\n", __func__);
return -EINVAL;
}
/* High bandwidth ISOC OUT in DDMA not supported */
if (using_desc_dma(hsotg) && ep_type == USB_ENDPOINT_XFER_ISOC &&
!dir_in && mc > 1) {
dev_err(hsotg->dev,
"%s: ISOC OUT, DDMA: HB not supported!\n", __func__);
return -EINVAL;
}
/* note, we handle this here instead of dwc2_hsotg_set_ep_maxpacket */
epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
epctrl = dwc2_readl(hsotg, epctrl_reg);
dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x from 0x%08x\n",
__func__, epctrl, epctrl_reg);
/* Allocate DMA descriptor chain for non-ctrl endpoints */
if (using_desc_dma(hsotg) && !hs_ep->desc_list) {
hs_ep->desc_list = dmam_alloc_coherent(hsotg->dev,
MAX_DMA_DESC_NUM_GENERIC *
sizeof(struct dwc2_dma_desc),
&hs_ep->desc_list_dma, GFP_ATOMIC);
if (!hs_ep->desc_list) {
ret = -ENOMEM;
goto error2;
}
}
spin_lock_irqsave(&hsotg->lock, flags);
epctrl &= ~(DXEPCTL_EPTYPE_MASK | DXEPCTL_MPS_MASK);
epctrl |= DXEPCTL_MPS(mps);
/*
* mark the endpoint as active, otherwise the core may ignore
* transactions entirely for this endpoint
*/
epctrl |= DXEPCTL_USBACTEP;
/* update the endpoint state */
dwc2_hsotg_set_ep_maxpacket(hsotg, hs_ep->index, mps, mc, dir_in);
/* default, set to non-periodic */
hs_ep->isochronous = 0;
hs_ep->periodic = 0;
hs_ep->halted = 0;
hs_ep->interval = desc->bInterval;
switch (ep_type) {
case USB_ENDPOINT_XFER_ISOC:
epctrl |= DXEPCTL_EPTYPE_ISO;
epctrl |= DXEPCTL_SETEVENFR;
hs_ep->isochronous = 1;
hs_ep->interval = 1 << (desc->bInterval - 1);
hs_ep->target_frame = TARGET_FRAME_INITIAL;
hs_ep->next_desc = 0;
hs_ep->compl_desc = 0;
if (dir_in) {
hs_ep->periodic = 1;
mask = dwc2_readl(hsotg, DIEPMSK);
mask |= DIEPMSK_NAKMSK;
dwc2_writel(hsotg, mask, DIEPMSK);
} else {
mask = dwc2_readl(hsotg, DOEPMSK);
mask |= DOEPMSK_OUTTKNEPDISMSK;
dwc2_writel(hsotg, mask, DOEPMSK);
}
break;
case USB_ENDPOINT_XFER_BULK:
epctrl |= DXEPCTL_EPTYPE_BULK;
break;
case USB_ENDPOINT_XFER_INT:
if (dir_in)
hs_ep->periodic = 1;
if (hsotg->gadget.speed == USB_SPEED_HIGH)
hs_ep->interval = 1 << (desc->bInterval - 1);
epctrl |= DXEPCTL_EPTYPE_INTERRUPT;
break;
case USB_ENDPOINT_XFER_CONTROL:
epctrl |= DXEPCTL_EPTYPE_CONTROL;
break;
}
/*
* if the hardware has dedicated fifos, we must give each IN EP
* a unique tx-fifo even if it is non-periodic.
*/
if (dir_in && hsotg->dedicated_fifos) {
u32 fifo_index = 0;
u32 fifo_size = UINT_MAX;
size = hs_ep->ep.maxpacket * hs_ep->mc;
for (i = 1; i < hsotg->num_of_eps; ++i) {
if (hsotg->fifo_map & (1 << i))
continue;
val = dwc2_readl(hsotg, DPTXFSIZN(i));
val = (val >> FIFOSIZE_DEPTH_SHIFT) * 4;
if (val < size)
continue;
/* Search for smallest acceptable fifo */
if (val < fifo_size) {
fifo_size = val;
fifo_index = i;
}
}
if (!fifo_index) {
dev_err(hsotg->dev,
"%s: No suitable fifo found\n", __func__);
ret = -ENOMEM;
goto error1;
}
hsotg->fifo_map |= 1 << fifo_index;
epctrl |= DXEPCTL_TXFNUM(fifo_index);
hs_ep->fifo_index = fifo_index;
hs_ep->fifo_size = fifo_size;
}
/* for non control endpoints, set PID to D0 */
if (index && !hs_ep->isochronous)
epctrl |= DXEPCTL_SETD0PID;
/* WA for Full speed ISOC IN in DDMA mode.
* By Clear NAK status of EP, core will send ZLP
* to IN token and assert NAK interrupt relying
* on TxFIFO status only
*/
if (hsotg->gadget.speed == USB_SPEED_FULL &&
hs_ep->isochronous && dir_in) {
/* The WA applies only to core versions from 2.72a
* to 4.00a (including both). Also for FS_IOT_1.00a
* and HS_IOT_1.00a.
*/
u32 gsnpsid = dwc2_readl(hsotg, GSNPSID);
if ((gsnpsid >= DWC2_CORE_REV_2_72a &&
gsnpsid <= DWC2_CORE_REV_4_00a) ||
gsnpsid == DWC2_FS_IOT_REV_1_00a ||
gsnpsid == DWC2_HS_IOT_REV_1_00a)
epctrl |= DXEPCTL_CNAK;
}
dev_dbg(hsotg->dev, "%s: write DxEPCTL=0x%08x\n",
__func__, epctrl);
dwc2_writel(hsotg, epctrl, epctrl_reg);
dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x\n",
__func__, dwc2_readl(hsotg, epctrl_reg));
/* enable the endpoint interrupt */
dwc2_hsotg_ctrl_epint(hsotg, index, dir_in, 1);
error1:
spin_unlock_irqrestore(&hsotg->lock, flags);
error2:
if (ret && using_desc_dma(hsotg) && hs_ep->desc_list) {
dmam_free_coherent(hsotg->dev, MAX_DMA_DESC_NUM_GENERIC *
sizeof(struct dwc2_dma_desc),
hs_ep->desc_list, hs_ep->desc_list_dma);
hs_ep->desc_list = NULL;
}
return ret;
}
/**
* dwc2_hsotg_ep_disable - disable given endpoint
* @ep: The endpoint to disable.
*/
static int dwc2_hsotg_ep_disable(struct usb_ep *ep)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hsotg = hs_ep->parent;
int dir_in = hs_ep->dir_in;
int index = hs_ep->index;
unsigned long flags;
u32 epctrl_reg;
u32 ctrl;
dev_dbg(hsotg->dev, "%s(ep %p)\n", __func__, ep);
if (ep == &hsotg->eps_out[0]->ep) {
dev_err(hsotg->dev, "%s: called for ep0\n", __func__);
return -EINVAL;
}
if (hsotg->op_state != OTG_STATE_B_PERIPHERAL) {
dev_err(hsotg->dev, "%s: called in host mode?\n", __func__);
return -EINVAL;
}
epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
spin_lock_irqsave(&hsotg->lock, flags);
ctrl = dwc2_readl(hsotg, epctrl_reg);
if (ctrl & DXEPCTL_EPENA)
dwc2_hsotg_ep_stop_xfr(hsotg, hs_ep);
ctrl &= ~DXEPCTL_EPENA;
ctrl &= ~DXEPCTL_USBACTEP;
ctrl |= DXEPCTL_SNAK;
dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl);
dwc2_writel(hsotg, ctrl, epctrl_reg);
/* disable endpoint interrupts */
dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 0);
/* terminate all requests with shutdown */
kill_all_requests(hsotg, hs_ep, -ESHUTDOWN);
hsotg->fifo_map &= ~(1 << hs_ep->fifo_index);
hs_ep->fifo_index = 0;
hs_ep->fifo_size = 0;
spin_unlock_irqrestore(&hsotg->lock, flags);
return 0;
}
/**
* on_list - check request is on the given endpoint
* @ep: The endpoint to check.
* @test: The request to test if it is on the endpoint.
*/
static bool on_list(struct dwc2_hsotg_ep *ep, struct dwc2_hsotg_req *test)
{
struct dwc2_hsotg_req *req, *treq;
list_for_each_entry_safe(req, treq, &ep->queue, queue) {
if (req == test)
return true;
}
return false;
}
/**
* dwc2_hsotg_ep_dequeue - dequeue given endpoint
* @ep: The endpoint to dequeue.
* @req: The request to be removed from a queue.
*/
static int dwc2_hsotg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
{
struct dwc2_hsotg_req *hs_req = our_req(req);
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hs = hs_ep->parent;
unsigned long flags;
dev_dbg(hs->dev, "ep_dequeue(%p,%p)\n", ep, req);
spin_lock_irqsave(&hs->lock, flags);
if (!on_list(hs_ep, hs_req)) {
spin_unlock_irqrestore(&hs->lock, flags);
return -EINVAL;
}
/* Dequeue already started request */
if (req == &hs_ep->req->req)
dwc2_hsotg_ep_stop_xfr(hs, hs_ep);
dwc2_hsotg_complete_request(hs, hs_ep, hs_req, -ECONNRESET);
spin_unlock_irqrestore(&hs->lock, flags);
return 0;
}
/**
* dwc2_hsotg_ep_sethalt - set halt on a given endpoint
* @ep: The endpoint to set halt.
* @value: Set or unset the halt.
* @now: If true, stall the endpoint now. Otherwise return -EAGAIN if
* the endpoint is busy processing requests.
*
* We need to stall the endpoint immediately if request comes from set_feature
* protocol command handler.
*/
static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hs = hs_ep->parent;
int index = hs_ep->index;
u32 epreg;
u32 epctl;
u32 xfertype;
dev_info(hs->dev, "%s(ep %p %s, %d)\n", __func__, ep, ep->name, value);
if (index == 0) {
if (value)
dwc2_hsotg_stall_ep0(hs);
else
dev_warn(hs->dev,
"%s: can't clear halt on ep0\n", __func__);
return 0;
}
if (hs_ep->isochronous) {
dev_err(hs->dev, "%s is Isochronous Endpoint\n", ep->name);
return -EINVAL;
}
if (!now && value && !list_empty(&hs_ep->queue)) {
dev_dbg(hs->dev, "%s request is pending, cannot halt\n",
ep->name);
return -EAGAIN;
}
if (hs_ep->dir_in) {
epreg = DIEPCTL(index);
epctl = dwc2_readl(hs, epreg);
if (value) {
epctl |= DXEPCTL_STALL | DXEPCTL_SNAK;
if (epctl & DXEPCTL_EPENA)
epctl |= DXEPCTL_EPDIS;
} else {
epctl &= ~DXEPCTL_STALL;
xfertype = epctl & DXEPCTL_EPTYPE_MASK;
if (xfertype == DXEPCTL_EPTYPE_BULK ||
xfertype == DXEPCTL_EPTYPE_INTERRUPT)
epctl |= DXEPCTL_SETD0PID;
}
dwc2_writel(hs, epctl, epreg);
} else {
epreg = DOEPCTL(index);
epctl = dwc2_readl(hs, epreg);
if (value) {
epctl |= DXEPCTL_STALL;
} else {
epctl &= ~DXEPCTL_STALL;
xfertype = epctl & DXEPCTL_EPTYPE_MASK;
if (xfertype == DXEPCTL_EPTYPE_BULK ||
xfertype == DXEPCTL_EPTYPE_INTERRUPT)
epctl |= DXEPCTL_SETD0PID;
}
dwc2_writel(hs, epctl, epreg);
}
hs_ep->halted = value;
return 0;
}
/**
* dwc2_hsotg_ep_sethalt_lock - set halt on a given endpoint with lock held
* @ep: The endpoint to set halt.
* @value: Set or unset the halt.
*/
static int dwc2_hsotg_ep_sethalt_lock(struct usb_ep *ep, int value)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hs = hs_ep->parent;
unsigned long flags = 0;
int ret = 0;
spin_lock_irqsave(&hs->lock, flags);
ret = dwc2_hsotg_ep_sethalt(ep, value, false);
spin_unlock_irqrestore(&hs->lock, flags);
return ret;
}
static const struct usb_ep_ops dwc2_hsotg_ep_ops = {
.enable = dwc2_hsotg_ep_enable,
.disable = dwc2_hsotg_ep_disable,
.alloc_request = dwc2_hsotg_ep_alloc_request,
.free_request = dwc2_hsotg_ep_free_request,
.queue = dwc2_hsotg_ep_queue_lock,
.dequeue = dwc2_hsotg_ep_dequeue,
.set_halt = dwc2_hsotg_ep_sethalt_lock,
/* note, don't believe we have any call for the fifo routines */
};
/**
* dwc2_hsotg_init - initialize the usb core
* @hsotg: The driver state
*/
static void dwc2_hsotg_init(struct dwc2_hsotg *hsotg)
{
u32 trdtim;
u32 usbcfg;
/* unmask subset of endpoint interrupts */
dwc2_writel(hsotg, DIEPMSK_TIMEOUTMSK | DIEPMSK_AHBERRMSK |
DIEPMSK_EPDISBLDMSK | DIEPMSK_XFERCOMPLMSK,
DIEPMSK);
dwc2_writel(hsotg, DOEPMSK_SETUPMSK | DOEPMSK_AHBERRMSK |
DOEPMSK_EPDISBLDMSK | DOEPMSK_XFERCOMPLMSK,
DOEPMSK);
dwc2_writel(hsotg, 0, DAINTMSK);
/* Be in disconnected state until gadget is registered */
dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON);
/* setup fifos */
dev_dbg(hsotg->dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n",
dwc2_readl(hsotg, GRXFSIZ),
dwc2_readl(hsotg, GNPTXFSIZ));
dwc2_hsotg_init_fifo(hsotg);
/* keep other bits untouched (so e.g. forced modes are not lost) */
usbcfg = dwc2_readl(hsotg, GUSBCFG);
usbcfg &= ~(GUSBCFG_TOUTCAL_MASK | GUSBCFG_PHYIF16 | GUSBCFG_SRPCAP |
GUSBCFG_HNPCAP | GUSBCFG_USBTRDTIM_MASK);
/* set the PLL on, remove the HNP/SRP and set the PHY */
trdtim = (hsotg->phyif == GUSBCFG_PHYIF8) ? 9 : 5;
usbcfg |= hsotg->phyif | GUSBCFG_TOUTCAL(7) |
(trdtim << GUSBCFG_USBTRDTIM_SHIFT);
dwc2_writel(hsotg, usbcfg, GUSBCFG);
if (using_dma(hsotg))
dwc2_set_bit(hsotg, GAHBCFG, GAHBCFG_DMA_EN);
}
/**
* dwc2_hsotg_udc_start - prepare the udc for work
* @gadget: The usb gadget state
* @driver: The usb gadget driver
*
* Perform initialization to prepare udc device and driver
* to work.
*/
static int dwc2_hsotg_udc_start(struct usb_gadget *gadget,
struct usb_gadget_driver *driver)
{
struct dwc2_hsotg *hsotg = to_hsotg(gadget);
unsigned long flags;
int ret;
if (!hsotg) {
pr_err("%s: called with no device\n", __func__);
return -ENODEV;
}
if (!driver) {
dev_err(hsotg->dev, "%s: no driver\n", __func__);
return -EINVAL;
}
if (driver->max_speed < USB_SPEED_FULL)
dev_err(hsotg->dev, "%s: bad speed\n", __func__);
if (!driver->setup) {
dev_err(hsotg->dev, "%s: missing entry points\n", __func__);
return -EINVAL;
}
WARN_ON(hsotg->driver);
driver->driver.bus = NULL;
hsotg->driver = driver;
hsotg->gadget.dev.of_node = hsotg->dev->of_node;
hsotg->gadget.speed = USB_SPEED_UNKNOWN;
if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) {
ret = dwc2_lowlevel_hw_enable(hsotg);
if (ret)
goto err;
}
if (!IS_ERR_OR_NULL(hsotg->uphy))
otg_set_peripheral(hsotg->uphy->otg, &hsotg->gadget);
spin_lock_irqsave(&hsotg->lock, flags);
if (dwc2_hw_is_device(hsotg)) {
dwc2_hsotg_init(hsotg);
dwc2_hsotg_core_init_disconnected(hsotg, false);
}
hsotg->enabled = 0;
spin_unlock_irqrestore(&hsotg->lock, flags);
dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name);
return 0;
err:
hsotg->driver = NULL;
return ret;
}
/**
* dwc2_hsotg_udc_stop - stop the udc
* @gadget: The usb gadget state
*
* Stop udc hw block and stay tunned for future transmissions
*/
static int dwc2_hsotg_udc_stop(struct usb_gadget *gadget)
{
struct dwc2_hsotg *hsotg = to_hsotg(gadget);
unsigned long flags = 0;
int ep;
if (!hsotg)
return -ENODEV;
/* all endpoints should be shutdown */
for (ep = 1; ep < hsotg->num_of_eps; ep++) {
if (hsotg->eps_in[ep])
dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
if (hsotg->eps_out[ep])
dwc2_hsotg_ep_disable(&hsotg->eps_out[ep]->ep);
}
spin_lock_irqsave(&hsotg->lock, flags);
hsotg->driver = NULL;
hsotg->gadget.speed = USB_SPEED_UNKNOWN;
hsotg->enabled = 0;
spin_unlock_irqrestore(&hsotg->lock, flags);
if (!IS_ERR_OR_NULL(hsotg->uphy))
otg_set_peripheral(hsotg->uphy->otg, NULL);
if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
dwc2_lowlevel_hw_disable(hsotg);
return 0;
}
/**
* dwc2_hsotg_gadget_getframe - read the frame number
* @gadget: The usb gadget state
*
* Read the {micro} frame number
*/
static int dwc2_hsotg_gadget_getframe(struct usb_gadget *gadget)
{
return dwc2_hsotg_read_frameno(to_hsotg(gadget));
}
/**
* dwc2_hsotg_pullup - connect/disconnect the USB PHY
* @gadget: The usb gadget state
* @is_on: Current state of the USB PHY
*
* Connect/Disconnect the USB PHY pullup
*/
static int dwc2_hsotg_pullup(struct usb_gadget *gadget, int is_on)
{
struct dwc2_hsotg *hsotg = to_hsotg(gadget);
unsigned long flags = 0;
dev_dbg(hsotg->dev, "%s: is_on: %d op_state: %d\n", __func__, is_on,
hsotg->op_state);
/* Don't modify pullup state while in host mode */
if (hsotg->op_state != OTG_STATE_B_PERIPHERAL) {
hsotg->enabled = is_on;
return 0;
}
spin_lock_irqsave(&hsotg->lock, flags);
if (is_on) {
hsotg->enabled = 1;
dwc2_hsotg_core_init_disconnected(hsotg, false);
/* Enable ACG feature in device mode,if supported */
dwc2_enable_acg(hsotg);
dwc2_hsotg_core_connect(hsotg);
} else {
dwc2_hsotg_core_disconnect(hsotg);
dwc2_hsotg_disconnect(hsotg);
hsotg->enabled = 0;
}
hsotg->gadget.speed = USB_SPEED_UNKNOWN;
spin_unlock_irqrestore(&hsotg->lock, flags);
return 0;
}
static int dwc2_hsotg_vbus_session(struct usb_gadget *gadget, int is_active)
{
struct dwc2_hsotg *hsotg = to_hsotg(gadget);
unsigned long flags;
dev_dbg(hsotg->dev, "%s: is_active: %d\n", __func__, is_active);
spin_lock_irqsave(&hsotg->lock, flags);
/*
* If controller is hibernated, it must exit from power_down
* before being initialized / de-initialized
*/
if (hsotg->lx_state == DWC2_L2)
dwc2_exit_partial_power_down(hsotg, false);
if (is_active) {
hsotg->op_state = OTG_STATE_B_PERIPHERAL;
dwc2_hsotg_core_init_disconnected(hsotg, false);
if (hsotg->enabled) {
/* Enable ACG feature in device mode,if supported */
dwc2_enable_acg(hsotg);
dwc2_hsotg_core_connect(hsotg);
}
} else {
dwc2_hsotg_core_disconnect(hsotg);
dwc2_hsotg_disconnect(hsotg);
}
spin_unlock_irqrestore(&hsotg->lock, flags);
return 0;
}
/**
* dwc2_hsotg_vbus_draw - report bMaxPower field
* @gadget: The usb gadget state
* @mA: Amount of current
*
* Report how much power the device may consume to the phy.
*/
static int dwc2_hsotg_vbus_draw(struct usb_gadget *gadget, unsigned int mA)
{
struct dwc2_hsotg *hsotg = to_hsotg(gadget);
if (IS_ERR_OR_NULL(hsotg->uphy))
return -ENOTSUPP;
return usb_phy_set_power(hsotg->uphy, mA);
}
static const struct usb_gadget_ops dwc2_hsotg_gadget_ops = {
.get_frame = dwc2_hsotg_gadget_getframe,
.udc_start = dwc2_hsotg_udc_start,
.udc_stop = dwc2_hsotg_udc_stop,
.pullup = dwc2_hsotg_pullup,
.vbus_session = dwc2_hsotg_vbus_session,
.vbus_draw = dwc2_hsotg_vbus_draw,
};
/**
* dwc2_hsotg_initep - initialise a single endpoint
* @hsotg: The device state.
* @hs_ep: The endpoint to be initialised.
* @epnum: The endpoint number
* @dir_in: True if direction is in.
*
* Initialise the given endpoint (as part of the probe and device state
* creation) to give to the gadget driver. Setup the endpoint name, any
* direction information and other state that may be required.
*/
static void dwc2_hsotg_initep(struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
int epnum,
bool dir_in)
{
char *dir;
if (epnum == 0)
dir = "";
else if (dir_in)
dir = "in";
else
dir = "out";
hs_ep->dir_in = dir_in;
hs_ep->index = epnum;
snprintf(hs_ep->name, sizeof(hs_ep->name), "ep%d%s", epnum, dir);
INIT_LIST_HEAD(&hs_ep->queue);
INIT_LIST_HEAD(&hs_ep->ep.ep_list);
/* add to the list of endpoints known by the gadget driver */
if (epnum)
list_add_tail(&hs_ep->ep.ep_list, &hsotg->gadget.ep_list);
hs_ep->parent = hsotg;
hs_ep->ep.name = hs_ep->name;
if (hsotg->params.speed == DWC2_SPEED_PARAM_LOW)
usb_ep_set_maxpacket_limit(&hs_ep->ep, 8);
else
usb_ep_set_maxpacket_limit(&hs_ep->ep,
epnum ? 1024 : EP0_MPS_LIMIT);
hs_ep->ep.ops = &dwc2_hsotg_ep_ops;
if (epnum == 0) {
hs_ep->ep.caps.type_control = true;
} else {
if (hsotg->params.speed != DWC2_SPEED_PARAM_LOW) {
hs_ep->ep.caps.type_iso = true;
hs_ep->ep.caps.type_bulk = true;
}
hs_ep->ep.caps.type_int = true;
}
if (dir_in)
hs_ep->ep.caps.dir_in = true;
else
hs_ep->ep.caps.dir_out = true;
/*
* if we're using dma, we need to set the next-endpoint pointer
* to be something valid.
*/
if (using_dma(hsotg)) {
u32 next = DXEPCTL_NEXTEP((epnum + 1) % 15);
if (dir_in)
dwc2_writel(hsotg, next, DIEPCTL(epnum));
else
dwc2_writel(hsotg, next, DOEPCTL(epnum));
}
}
/**
* dwc2_hsotg_hw_cfg - read HW configuration registers
* @hsotg: Programming view of the DWC_otg controller
*
* Read the USB core HW configuration registers
*/
static int dwc2_hsotg_hw_cfg(struct dwc2_hsotg *hsotg)
{
u32 cfg;
u32 ep_type;
u32 i;
/* check hardware configuration */
hsotg->num_of_eps = hsotg->hw_params.num_dev_ep;
/* Add ep0 */
hsotg->num_of_eps++;
hsotg->eps_in[0] = devm_kzalloc(hsotg->dev,
sizeof(struct dwc2_hsotg_ep),
GFP_KERNEL);
if (!hsotg->eps_in[0])
return -ENOMEM;
/* Same dwc2_hsotg_ep is used in both directions for ep0 */
hsotg->eps_out[0] = hsotg->eps_in[0];
cfg = hsotg->hw_params.dev_ep_dirs;
for (i = 1, cfg >>= 2; i < hsotg->num_of_eps; i++, cfg >>= 2) {
ep_type = cfg & 3;
/* Direction in or both */
if (!(ep_type & 2)) {
hsotg->eps_in[i] = devm_kzalloc(hsotg->dev,
sizeof(struct dwc2_hsotg_ep), GFP_KERNEL);
if (!hsotg->eps_in[i])
return -ENOMEM;
}
/* Direction out or both */
if (!(ep_type & 1)) {
hsotg->eps_out[i] = devm_kzalloc(hsotg->dev,
sizeof(struct dwc2_hsotg_ep), GFP_KERNEL);
if (!hsotg->eps_out[i])
return -ENOMEM;
}
}
hsotg->fifo_mem = hsotg->hw_params.total_fifo_size;
hsotg->dedicated_fifos = hsotg->hw_params.en_multiple_tx_fifo;
dev_info(hsotg->dev, "EPs: %d, %s fifos, %d entries in SPRAM\n",
hsotg->num_of_eps,
hsotg->dedicated_fifos ? "dedicated" : "shared",
hsotg->fifo_mem);
return 0;
}
/**
* dwc2_hsotg_dump - dump state of the udc
* @hsotg: Programming view of the DWC_otg controller
*
*/
static void dwc2_hsotg_dump(struct dwc2_hsotg *hsotg)
{
#ifdef DEBUG
struct device *dev = hsotg->dev;
u32 val;
int idx;
dev_info(dev, "DCFG=0x%08x, DCTL=0x%08x, DIEPMSK=%08x\n",
dwc2_readl(hsotg, DCFG), dwc2_readl(hsotg, DCTL),
dwc2_readl(hsotg, DIEPMSK));
dev_info(dev, "GAHBCFG=0x%08x, GHWCFG1=0x%08x\n",
dwc2_readl(hsotg, GAHBCFG), dwc2_readl(hsotg, GHWCFG1));
dev_info(dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n",
dwc2_readl(hsotg, GRXFSIZ), dwc2_readl(hsotg, GNPTXFSIZ));
/* show periodic fifo settings */
for (idx = 1; idx < hsotg->num_of_eps; idx++) {
val = dwc2_readl(hsotg, DPTXFSIZN(idx));
dev_info(dev, "DPTx[%d] FSize=%d, StAddr=0x%08x\n", idx,
val >> FIFOSIZE_DEPTH_SHIFT,
val & FIFOSIZE_STARTADDR_MASK);
}
for (idx = 0; idx < hsotg->num_of_eps; idx++) {
dev_info(dev,
"ep%d-in: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", idx,
dwc2_readl(hsotg, DIEPCTL(idx)),
dwc2_readl(hsotg, DIEPTSIZ(idx)),
dwc2_readl(hsotg, DIEPDMA(idx)));
val = dwc2_readl(hsotg, DOEPCTL(idx));
dev_info(dev,
"ep%d-out: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n",
idx, dwc2_readl(hsotg, DOEPCTL(idx)),
dwc2_readl(hsotg, DOEPTSIZ(idx)),
dwc2_readl(hsotg, DOEPDMA(idx)));
}
dev_info(dev, "DVBUSDIS=0x%08x, DVBUSPULSE=%08x\n",
dwc2_readl(hsotg, DVBUSDIS), dwc2_readl(hsotg, DVBUSPULSE));
#endif
}
/**
* dwc2_gadget_init - init function for gadget
* @hsotg: Programming view of the DWC_otg controller
*
*/
int dwc2_gadget_init(struct dwc2_hsotg *hsotg)
{
struct device *dev = hsotg->dev;
int epnum;
int ret;
/* Dump fifo information */
dev_dbg(dev, "NonPeriodic TXFIFO size: %d\n",
hsotg->params.g_np_tx_fifo_size);
dev_dbg(dev, "RXFIFO size: %d\n", hsotg->params.g_rx_fifo_size);
hsotg->gadget.max_speed = USB_SPEED_HIGH;
hsotg->gadget.ops = &dwc2_hsotg_gadget_ops;
hsotg->gadget.name = dev_name(dev);
hsotg->remote_wakeup_allowed = 0;
if (hsotg->params.lpm)
hsotg->gadget.lpm_capable = true;
if (hsotg->dr_mode == USB_DR_MODE_OTG)
hsotg->gadget.is_otg = 1;
else if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
hsotg->op_state = OTG_STATE_B_PERIPHERAL;
ret = dwc2_hsotg_hw_cfg(hsotg);
if (ret) {
dev_err(hsotg->dev, "Hardware configuration failed: %d\n", ret);
return ret;
}
hsotg->ctrl_buff = devm_kzalloc(hsotg->dev,
DWC2_CTRL_BUFF_SIZE, GFP_KERNEL);
if (!hsotg->ctrl_buff)
return -ENOMEM;
hsotg->ep0_buff = devm_kzalloc(hsotg->dev,
DWC2_CTRL_BUFF_SIZE, GFP_KERNEL);
if (!hsotg->ep0_buff)
return -ENOMEM;
if (using_desc_dma(hsotg)) {
ret = dwc2_gadget_alloc_ctrl_desc_chains(hsotg);
if (ret < 0)
return ret;
}
ret = devm_request_irq(hsotg->dev, hsotg->irq, dwc2_hsotg_irq,
IRQF_SHARED, dev_name(hsotg->dev), hsotg);
if (ret < 0) {
dev_err(dev, "cannot claim IRQ for gadget\n");
return ret;
}
/* hsotg->num_of_eps holds number of EPs other than ep0 */
if (hsotg->num_of_eps == 0) {
dev_err(dev, "wrong number of EPs (zero)\n");
return -EINVAL;
}
/* setup endpoint information */
INIT_LIST_HEAD(&hsotg->gadget.ep_list);
hsotg->gadget.ep0 = &hsotg->eps_out[0]->ep;
/* allocate EP0 request */
hsotg->ctrl_req = dwc2_hsotg_ep_alloc_request(&hsotg->eps_out[0]->ep,
GFP_KERNEL);
if (!hsotg->ctrl_req) {
dev_err(dev, "failed to allocate ctrl req\n");
return -ENOMEM;
}
/* initialise the endpoints now the core has been initialised */
for (epnum = 0; epnum < hsotg->num_of_eps; epnum++) {
if (hsotg->eps_in[epnum])
dwc2_hsotg_initep(hsotg, hsotg->eps_in[epnum],
epnum, 1);
if (hsotg->eps_out[epnum])
dwc2_hsotg_initep(hsotg, hsotg->eps_out[epnum],
epnum, 0);
}
ret = usb_add_gadget_udc(dev, &hsotg->gadget);
if (ret) {
dwc2_hsotg_ep_free_request(&hsotg->eps_out[0]->ep,
hsotg->ctrl_req);
return ret;
}
dwc2_hsotg_dump(hsotg);
return 0;
}
/**
* dwc2_hsotg_remove - remove function for hsotg driver
* @hsotg: Programming view of the DWC_otg controller
*
*/
int dwc2_hsotg_remove(struct dwc2_hsotg *hsotg)
{
usb_del_gadget_udc(&hsotg->gadget);
dwc2_hsotg_ep_free_request(&hsotg->eps_out[0]->ep, hsotg->ctrl_req);
return 0;
}
int dwc2_hsotg_suspend(struct dwc2_hsotg *hsotg)
{
unsigned long flags;
if (hsotg->lx_state != DWC2_L0)
return 0;
if (hsotg->driver) {
int ep;
dev_info(hsotg->dev, "suspending usb gadget %s\n",
hsotg->driver->driver.name);
spin_lock_irqsave(&hsotg->lock, flags);
if (hsotg->enabled)
dwc2_hsotg_core_disconnect(hsotg);
dwc2_hsotg_disconnect(hsotg);
hsotg->gadget.speed = USB_SPEED_UNKNOWN;
spin_unlock_irqrestore(&hsotg->lock, flags);
for (ep = 0; ep < hsotg->num_of_eps; ep++) {
if (hsotg->eps_in[ep])
dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
if (hsotg->eps_out[ep])
dwc2_hsotg_ep_disable(&hsotg->eps_out[ep]->ep);
}
}
return 0;
}
int dwc2_hsotg_resume(struct dwc2_hsotg *hsotg)
{
unsigned long flags;
if (hsotg->lx_state == DWC2_L2)
return 0;
if (hsotg->driver) {
dev_info(hsotg->dev, "resuming usb gadget %s\n",
hsotg->driver->driver.name);
spin_lock_irqsave(&hsotg->lock, flags);
dwc2_hsotg_core_init_disconnected(hsotg, false);
if (hsotg->enabled) {
/* Enable ACG feature in device mode,if supported */
dwc2_enable_acg(hsotg);
dwc2_hsotg_core_connect(hsotg);
}
spin_unlock_irqrestore(&hsotg->lock, flags);
}
return 0;
}
/**
* dwc2_backup_device_registers() - Backup controller device registers.
* When suspending usb bus, registers needs to be backuped
* if controller power is disabled once suspended.
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_backup_device_registers(struct dwc2_hsotg *hsotg)
{
struct dwc2_dregs_backup *dr;
int i;
dev_dbg(hsotg->dev, "%s\n", __func__);
/* Backup dev regs */
dr = &hsotg->dr_backup;
dr->dcfg = dwc2_readl(hsotg, DCFG);
dr->dctl = dwc2_readl(hsotg, DCTL);
dr->daintmsk = dwc2_readl(hsotg, DAINTMSK);
dr->diepmsk = dwc2_readl(hsotg, DIEPMSK);
dr->doepmsk = dwc2_readl(hsotg, DOEPMSK);
for (i = 0; i < hsotg->num_of_eps; i++) {
/* Backup IN EPs */
dr->diepctl[i] = dwc2_readl(hsotg, DIEPCTL(i));
/* Ensure DATA PID is correctly configured */
if (dr->diepctl[i] & DXEPCTL_DPID)
dr->diepctl[i] |= DXEPCTL_SETD1PID;
else
dr->diepctl[i] |= DXEPCTL_SETD0PID;
dr->dieptsiz[i] = dwc2_readl(hsotg, DIEPTSIZ(i));
dr->diepdma[i] = dwc2_readl(hsotg, DIEPDMA(i));
/* Backup OUT EPs */
dr->doepctl[i] = dwc2_readl(hsotg, DOEPCTL(i));
/* Ensure DATA PID is correctly configured */
if (dr->doepctl[i] & DXEPCTL_DPID)
dr->doepctl[i] |= DXEPCTL_SETD1PID;
else
dr->doepctl[i] |= DXEPCTL_SETD0PID;
dr->doeptsiz[i] = dwc2_readl(hsotg, DOEPTSIZ(i));
dr->doepdma[i] = dwc2_readl(hsotg, DOEPDMA(i));
dr->dtxfsiz[i] = dwc2_readl(hsotg, DPTXFSIZN(i));
}
dr->valid = true;
return 0;
}
/**
* dwc2_restore_device_registers() - Restore controller device registers.
* When resuming usb bus, device registers needs to be restored
* if controller power were disabled.
*
* @hsotg: Programming view of the DWC_otg controller
* @remote_wakeup: Indicates whether resume is initiated by Device or Host.
*
* Return: 0 if successful, negative error code otherwise
*/
int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg, int remote_wakeup)
{
struct dwc2_dregs_backup *dr;
int i;
dev_dbg(hsotg->dev, "%s\n", __func__);
/* Restore dev regs */
dr = &hsotg->dr_backup;
if (!dr->valid) {
dev_err(hsotg->dev, "%s: no device registers to restore\n",
__func__);
return -EINVAL;
}
dr->valid = false;
if (!remote_wakeup)
dwc2_writel(hsotg, dr->dctl, DCTL);
dwc2_writel(hsotg, dr->daintmsk, DAINTMSK);
dwc2_writel(hsotg, dr->diepmsk, DIEPMSK);
dwc2_writel(hsotg, dr->doepmsk, DOEPMSK);
for (i = 0; i < hsotg->num_of_eps; i++) {
/* Restore IN EPs */
dwc2_writel(hsotg, dr->dieptsiz[i], DIEPTSIZ(i));
dwc2_writel(hsotg, dr->diepdma[i], DIEPDMA(i));
dwc2_writel(hsotg, dr->doeptsiz[i], DOEPTSIZ(i));
/** WA for enabled EPx's IN in DDMA mode. On entering to
* hibernation wrong value read and saved from DIEPDMAx,
* as result BNA interrupt asserted on hibernation exit
* by restoring from saved area.
*/
if (hsotg->params.g_dma_desc &&
(dr->diepctl[i] & DXEPCTL_EPENA))
dr->diepdma[i] = hsotg->eps_in[i]->desc_list_dma;
dwc2_writel(hsotg, dr->dtxfsiz[i], DPTXFSIZN(i));
dwc2_writel(hsotg, dr->diepctl[i], DIEPCTL(i));
/* Restore OUT EPs */
dwc2_writel(hsotg, dr->doeptsiz[i], DOEPTSIZ(i));
/* WA for enabled EPx's OUT in DDMA mode. On entering to
* hibernation wrong value read and saved from DOEPDMAx,
* as result BNA interrupt asserted on hibernation exit
* by restoring from saved area.
*/
if (hsotg->params.g_dma_desc &&
(dr->doepctl[i] & DXEPCTL_EPENA))
dr->doepdma[i] = hsotg->eps_out[i]->desc_list_dma;
dwc2_writel(hsotg, dr->doepdma[i], DOEPDMA(i));
dwc2_writel(hsotg, dr->doepctl[i], DOEPCTL(i));
}
return 0;
}
/**
* dwc2_gadget_init_lpm - Configure the core to support LPM in device mode
*
* @hsotg: Programming view of DWC_otg controller
*
*/
void dwc2_gadget_init_lpm(struct dwc2_hsotg *hsotg)
{
u32 val;
if (!hsotg->params.lpm)
return;
val = GLPMCFG_LPMCAP | GLPMCFG_APPL1RES;
val |= hsotg->params.hird_threshold_en ? GLPMCFG_HIRD_THRES_EN : 0;
val |= hsotg->params.lpm_clock_gating ? GLPMCFG_ENBLSLPM : 0;
val |= hsotg->params.hird_threshold << GLPMCFG_HIRD_THRES_SHIFT;
val |= hsotg->params.besl ? GLPMCFG_ENBESL : 0;
dwc2_writel(hsotg, val, GLPMCFG);
dev_dbg(hsotg->dev, "GLPMCFG=0x%08x\n", dwc2_readl(hsotg, GLPMCFG));
}
/**
* dwc2_gadget_enter_hibernation() - Put controller in Hibernation.
*
* @hsotg: Programming view of the DWC_otg controller
*
* Return non-zero if failed to enter to hibernation.
*/
int dwc2_gadget_enter_hibernation(struct dwc2_hsotg *hsotg)
{
u32 gpwrdn;
int ret = 0;
/* Change to L2(suspend) state */
hsotg->lx_state = DWC2_L2;
dev_dbg(hsotg->dev, "Start of hibernation completed\n");
ret = dwc2_backup_global_registers(hsotg);
if (ret) {
dev_err(hsotg->dev, "%s: failed to backup global registers\n",
__func__);
return ret;
}
ret = dwc2_backup_device_registers(hsotg);
if (ret) {
dev_err(hsotg->dev, "%s: failed to backup device registers\n",
__func__);
return ret;
}
gpwrdn = GPWRDN_PWRDNRSTN;
gpwrdn |= GPWRDN_PMUACTV;
dwc2_writel(hsotg, gpwrdn, GPWRDN);
udelay(10);
/* Set flag to indicate that we are in hibernation */
hsotg->hibernated = 1;
/* Enable interrupts from wake up logic */
gpwrdn = dwc2_readl(hsotg, GPWRDN);
gpwrdn |= GPWRDN_PMUINTSEL;
dwc2_writel(hsotg, gpwrdn, GPWRDN);
udelay(10);
/* Unmask device mode interrupts in GPWRDN */
gpwrdn = dwc2_readl(hsotg, GPWRDN);
gpwrdn |= GPWRDN_RST_DET_MSK;
gpwrdn |= GPWRDN_LNSTSCHG_MSK;
gpwrdn |= GPWRDN_STS_CHGINT_MSK;
dwc2_writel(hsotg, gpwrdn, GPWRDN);
udelay(10);
/* Enable Power Down Clamp */
gpwrdn = dwc2_readl(hsotg, GPWRDN);
gpwrdn |= GPWRDN_PWRDNCLMP;
dwc2_writel(hsotg, gpwrdn, GPWRDN);
udelay(10);
/* Switch off VDD */
gpwrdn = dwc2_readl(hsotg, GPWRDN);
gpwrdn |= GPWRDN_PWRDNSWTCH;
dwc2_writel(hsotg, gpwrdn, GPWRDN);
udelay(10);
/* Save gpwrdn register for further usage if stschng interrupt */
hsotg->gr_backup.gpwrdn = dwc2_readl(hsotg, GPWRDN);
dev_dbg(hsotg->dev, "Hibernation completed\n");
return ret;
}
/**
* dwc2_gadget_exit_hibernation()
* This function is for exiting from Device mode hibernation by host initiated
* resume/reset and device initiated remote-wakeup.
*
* @hsotg: Programming view of the DWC_otg controller
* @rem_wakeup: indicates whether resume is initiated by Device or Host.
* @reset: indicates whether resume is initiated by Reset.
*
* Return non-zero if failed to exit from hibernation.
*/
int dwc2_gadget_exit_hibernation(struct dwc2_hsotg *hsotg,
int rem_wakeup, int reset)
{
u32 pcgcctl;
u32 gpwrdn;
u32 dctl;
int ret = 0;
struct dwc2_gregs_backup *gr;
struct dwc2_dregs_backup *dr;
gr = &hsotg->gr_backup;
dr = &hsotg->dr_backup;
if (!hsotg->hibernated) {
dev_dbg(hsotg->dev, "Already exited from Hibernation\n");
return 1;
}
dev_dbg(hsotg->dev,
"%s: called with rem_wakeup = %d reset = %d\n",
__func__, rem_wakeup, reset);
dwc2_hib_restore_common(hsotg, rem_wakeup, 0);
if (!reset) {
/* Clear all pending interupts */
dwc2_writel(hsotg, 0xffffffff, GINTSTS);
}
/* De-assert Restore */
gpwrdn = dwc2_readl(hsotg, GPWRDN);
gpwrdn &= ~GPWRDN_RESTORE;
dwc2_writel(hsotg, gpwrdn, GPWRDN);
udelay(10);
if (!rem_wakeup) {
pcgcctl = dwc2_readl(hsotg, PCGCTL);
pcgcctl &= ~PCGCTL_RSTPDWNMODULE;
dwc2_writel(hsotg, pcgcctl, PCGCTL);
}
/* Restore GUSBCFG, DCFG and DCTL */
dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG);
dwc2_writel(hsotg, dr->dcfg, DCFG);
dwc2_writel(hsotg, dr->dctl, DCTL);
/* De-assert Wakeup Logic */
gpwrdn = dwc2_readl(hsotg, GPWRDN);
gpwrdn &= ~GPWRDN_PMUACTV;
dwc2_writel(hsotg, gpwrdn, GPWRDN);
if (rem_wakeup) {
udelay(10);
/* Start Remote Wakeup Signaling */
dwc2_writel(hsotg, dr->dctl | DCTL_RMTWKUPSIG, DCTL);
} else {
udelay(50);
/* Set Device programming done bit */
dctl = dwc2_readl(hsotg, DCTL);
dctl |= DCTL_PWRONPRGDONE;
dwc2_writel(hsotg, dctl, DCTL);
}
/* Wait for interrupts which must be cleared */
mdelay(2);
/* Clear all pending interupts */
dwc2_writel(hsotg, 0xffffffff, GINTSTS);
/* Restore global registers */
ret = dwc2_restore_global_registers(hsotg);
if (ret) {
dev_err(hsotg->dev, "%s: failed to restore registers\n",
__func__);
return ret;
}
/* Restore device registers */
ret = dwc2_restore_device_registers(hsotg, rem_wakeup);
if (ret) {
dev_err(hsotg->dev, "%s: failed to restore device registers\n",
__func__);
return ret;
}
if (rem_wakeup) {
mdelay(10);
dctl = dwc2_readl(hsotg, DCTL);
dctl &= ~DCTL_RMTWKUPSIG;
dwc2_writel(hsotg, dctl, DCTL);
}
hsotg->hibernated = 0;
hsotg->lx_state = DWC2_L0;
dev_dbg(hsotg->dev, "Hibernation recovery completes here\n");
return ret;
}
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