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linux/drivers/usb/gadget/udc/net2272.c
Alan Stern de497f6346 USB: UDC: net22{80,72}: remove mistaken test of req->zero 
The net2280 UDC driver (and also net2272, probably via copy-and-paste)
incorrectly checks the req->zero flag during OUT transfers, after
copying data from the UDC's FIFO into memory.  This makes no sense at
all; the "zero" flag indicates that an extra zero-length packet should
be appended to an IN transfer if the length is an even multiple of the
maxpacket size.  It has nothing to do with OUT transfers.

In practice this doesn't cause any problems because gadget drivers
never set req->zero for OUT transfers anyway.  Still, it is an error
and unnecessary code, so this patch removes the check.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2019-05-03 09:13:47 +03:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for PLX NET2272 USB device controller
*
* Copyright (C) 2005-2006 PLX Technology, Inc.
* Copyright (C) 2006-2011 Analog Devices, Inc.
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/prefetch.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/usb.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include "net2272.h"
#define DRIVER_DESC "PLX NET2272 USB Peripheral Controller"
static const char driver_name[] = "net2272";
static const char driver_vers[] = "2006 October 17/mainline";
static const char driver_desc[] = DRIVER_DESC;
static const char ep0name[] = "ep0";
static const char * const ep_name[] = {
ep0name,
"ep-a", "ep-b", "ep-c",
};
#ifdef CONFIG_USB_NET2272_DMA
/*
* use_dma: the NET2272 can use an external DMA controller.
* Note that since there is no generic DMA api, some functions,
* notably request_dma, start_dma, and cancel_dma will need to be
* modified for your platform's particular dma controller.
*
* If use_dma is disabled, pio will be used instead.
*/
static bool use_dma = 0;
module_param(use_dma, bool, 0644);
/*
* dma_ep: selects the endpoint for use with dma (1=ep-a, 2=ep-b)
* The NET2272 can only use dma for a single endpoint at a time.
* At some point this could be modified to allow either endpoint
* to take control of dma as it becomes available.
*
* Note that DMA should not be used on OUT endpoints unless it can
* be guaranteed that no short packets will arrive on an IN endpoint
* while the DMA operation is pending. Otherwise the OUT DMA will
* terminate prematurely (See NET2272 Errata 630-0213-0101)
*/
static ushort dma_ep = 1;
module_param(dma_ep, ushort, 0644);
/*
* dma_mode: net2272 dma mode setting (see LOCCTL1 definiton):
* mode 0 == Slow DREQ mode
* mode 1 == Fast DREQ mode
* mode 2 == Burst mode
*/
static ushort dma_mode = 2;
module_param(dma_mode, ushort, 0644);
#else
#define use_dma 0
#define dma_ep 1
#define dma_mode 2
#endif
/*
* fifo_mode: net2272 buffer configuration:
* mode 0 == ep-{a,b,c} 512db each
* mode 1 == ep-a 1k, ep-{b,c} 512db
* mode 2 == ep-a 1k, ep-b 1k, ep-c 512db
* mode 3 == ep-a 1k, ep-b disabled, ep-c 512db
*/
static ushort fifo_mode = 0;
module_param(fifo_mode, ushort, 0644);
/*
* enable_suspend: When enabled, the driver will respond to
* USB suspend requests by powering down the NET2272. Otherwise,
* USB suspend requests will be ignored. This is acceptible for
* self-powered devices. For bus powered devices set this to 1.
*/
static ushort enable_suspend = 0;
module_param(enable_suspend, ushort, 0644);
static void assert_out_naking(struct net2272_ep *ep, const char *where)
{
u8 tmp;
#ifndef DEBUG
return;
#endif
tmp = net2272_ep_read(ep, EP_STAT0);
if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
dev_dbg(ep->dev->dev, "%s %s %02x !NAK\n",
ep->ep.name, where, tmp);
net2272_ep_write(ep, EP_RSPSET, 1 << ALT_NAK_OUT_PACKETS);
}
}
#define ASSERT_OUT_NAKING(ep) assert_out_naking(ep, __func__)
static void stop_out_naking(struct net2272_ep *ep)
{
u8 tmp = net2272_ep_read(ep, EP_STAT0);
if ((tmp & (1 << NAK_OUT_PACKETS)) != 0)
net2272_ep_write(ep, EP_RSPCLR, 1 << ALT_NAK_OUT_PACKETS);
}
#define PIPEDIR(bAddress) (usb_pipein(bAddress) ? "in" : "out")
static char *type_string(u8 bmAttributes)
{
switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_BULK: return "bulk";
case USB_ENDPOINT_XFER_ISOC: return "iso";
case USB_ENDPOINT_XFER_INT: return "intr";
default: return "control";
}
}
static char *buf_state_string(unsigned state)
{
switch (state) {
case BUFF_FREE: return "free";
case BUFF_VALID: return "valid";
case BUFF_LCL: return "local";
case BUFF_USB: return "usb";
default: return "unknown";
}
}
static char *dma_mode_string(void)
{
if (!use_dma)
return "PIO";
switch (dma_mode) {
case 0: return "SLOW DREQ";
case 1: return "FAST DREQ";
case 2: return "BURST";
default: return "invalid";
}
}
static void net2272_dequeue_all(struct net2272_ep *);
static int net2272_kick_dma(struct net2272_ep *, struct net2272_request *);
static int net2272_fifo_status(struct usb_ep *);
static const struct usb_ep_ops net2272_ep_ops;
/*---------------------------------------------------------------------------*/
static int
net2272_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
{
struct net2272 *dev;
struct net2272_ep *ep;
u32 max;
u8 tmp;
unsigned long flags;
ep = container_of(_ep, struct net2272_ep, ep);
if (!_ep || !desc || ep->desc || _ep->name == ep0name
|| desc->bDescriptorType != USB_DT_ENDPOINT)
return -EINVAL;
dev = ep->dev;
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
max = usb_endpoint_maxp(desc);
spin_lock_irqsave(&dev->lock, flags);
_ep->maxpacket = max;
ep->desc = desc;
/* net2272_ep_reset() has already been called */
ep->stopped = 0;
ep->wedged = 0;
/* set speed-dependent max packet */
net2272_ep_write(ep, EP_MAXPKT0, max & 0xff);
net2272_ep_write(ep, EP_MAXPKT1, (max & 0xff00) >> 8);
/* set type, direction, address; reset fifo counters */
net2272_ep_write(ep, EP_STAT1, 1 << BUFFER_FLUSH);
tmp = usb_endpoint_type(desc);
if (usb_endpoint_xfer_bulk(desc)) {
/* catch some particularly blatant driver bugs */
if ((dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
(dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
spin_unlock_irqrestore(&dev->lock, flags);
return -ERANGE;
}
}
ep->is_iso = usb_endpoint_xfer_isoc(desc) ? 1 : 0;
tmp <<= ENDPOINT_TYPE;
tmp |= ((desc->bEndpointAddress & 0x0f) << ENDPOINT_NUMBER);
tmp |= usb_endpoint_dir_in(desc) << ENDPOINT_DIRECTION;
tmp |= (1 << ENDPOINT_ENABLE);
/* for OUT transfers, block the rx fifo until a read is posted */
ep->is_in = usb_endpoint_dir_in(desc);
if (!ep->is_in)
net2272_ep_write(ep, EP_RSPSET, 1 << ALT_NAK_OUT_PACKETS);
net2272_ep_write(ep, EP_CFG, tmp);
/* enable irqs */
tmp = (1 << ep->num) | net2272_read(dev, IRQENB0);
net2272_write(dev, IRQENB0, tmp);
tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
| (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE)
| net2272_ep_read(ep, EP_IRQENB);
net2272_ep_write(ep, EP_IRQENB, tmp);
tmp = desc->bEndpointAddress;
dev_dbg(dev->dev, "enabled %s (ep%d%s-%s) max %04x cfg %02x\n",
_ep->name, tmp & 0x0f, PIPEDIR(tmp),
type_string(desc->bmAttributes), max,
net2272_ep_read(ep, EP_CFG));
spin_unlock_irqrestore(&dev->lock, flags);
return 0;
}
static void net2272_ep_reset(struct net2272_ep *ep)
{
u8 tmp;
ep->desc = NULL;
INIT_LIST_HEAD(&ep->queue);
usb_ep_set_maxpacket_limit(&ep->ep, ~0);
ep->ep.ops = &net2272_ep_ops;
/* disable irqs, endpoint */
net2272_ep_write(ep, EP_IRQENB, 0);
/* init to our chosen defaults, notably so that we NAK OUT
* packets until the driver queues a read.
*/
tmp = (1 << NAK_OUT_PACKETS_MODE) | (1 << ALT_NAK_OUT_PACKETS);
net2272_ep_write(ep, EP_RSPSET, tmp);
tmp = (1 << INTERRUPT_MODE) | (1 << HIDE_STATUS_PHASE);
if (ep->num != 0)
tmp |= (1 << ENDPOINT_TOGGLE) | (1 << ENDPOINT_HALT);
net2272_ep_write(ep, EP_RSPCLR, tmp);
/* scrub most status bits, and flush any fifo state */
net2272_ep_write(ep, EP_STAT0,
(1 << DATA_IN_TOKEN_INTERRUPT)
| (1 << DATA_OUT_TOKEN_INTERRUPT)
| (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
| (1 << DATA_PACKET_RECEIVED_INTERRUPT)
| (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT));
net2272_ep_write(ep, EP_STAT1,
(1 << TIMEOUT)
| (1 << USB_OUT_ACK_SENT)
| (1 << USB_OUT_NAK_SENT)
| (1 << USB_IN_ACK_RCVD)
| (1 << USB_IN_NAK_SENT)
| (1 << USB_STALL_SENT)
| (1 << LOCAL_OUT_ZLP)
| (1 << BUFFER_FLUSH));
/* fifo size is handled seperately */
}
static int net2272_disable(struct usb_ep *_ep)
{
struct net2272_ep *ep;
unsigned long flags;
ep = container_of(_ep, struct net2272_ep, ep);
if (!_ep || !ep->desc || _ep->name == ep0name)
return -EINVAL;
spin_lock_irqsave(&ep->dev->lock, flags);
net2272_dequeue_all(ep);
net2272_ep_reset(ep);
dev_vdbg(ep->dev->dev, "disabled %s\n", _ep->name);
spin_unlock_irqrestore(&ep->dev->lock, flags);
return 0;
}
/*---------------------------------------------------------------------------*/
static struct usb_request *
net2272_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
{
struct net2272_request *req;
if (!_ep)
return NULL;
req = kzalloc(sizeof(*req), gfp_flags);
if (!req)
return NULL;
INIT_LIST_HEAD(&req->queue);
return &req->req;
}
static void
net2272_free_request(struct usb_ep *_ep, struct usb_request *_req)
{
struct net2272_request *req;
if (!_ep || !_req)
return;
req = container_of(_req, struct net2272_request, req);
WARN_ON(!list_empty(&req->queue));
kfree(req);
}
static void
net2272_done(struct net2272_ep *ep, struct net2272_request *req, int status)
{
struct net2272 *dev;
unsigned stopped = ep->stopped;
if (ep->num == 0) {
if (ep->dev->protocol_stall) {
ep->stopped = 1;
set_halt(ep);
}
allow_status(ep);
}
list_del_init(&req->queue);
if (req->req.status == -EINPROGRESS)
req->req.status = status;
else
status = req->req.status;
dev = ep->dev;
if (use_dma && ep->dma)
usb_gadget_unmap_request(&dev->gadget, &req->req,
ep->is_in);
if (status && status != -ESHUTDOWN)
dev_vdbg(dev->dev, "complete %s req %p stat %d len %u/%u buf %p\n",
ep->ep.name, &req->req, status,
req->req.actual, req->req.length, req->req.buf);
/* don't modify queue heads during completion callback */
ep->stopped = 1;
spin_unlock(&dev->lock);
usb_gadget_giveback_request(&ep->ep, &req->req);
spin_lock(&dev->lock);
ep->stopped = stopped;
}
static int
net2272_write_packet(struct net2272_ep *ep, u8 *buf,
struct net2272_request *req, unsigned max)
{
u16 __iomem *ep_data = net2272_reg_addr(ep->dev, EP_DATA);
u16 *bufp;
unsigned length, count;
u8 tmp;
length = min(req->req.length - req->req.actual, max);
req->req.actual += length;
dev_vdbg(ep->dev->dev, "write packet %s req %p max %u len %u avail %u\n",
ep->ep.name, req, max, length,
(net2272_ep_read(ep, EP_AVAIL1) << 8) | net2272_ep_read(ep, EP_AVAIL0));
count = length;
bufp = (u16 *)buf;
while (likely(count >= 2)) {
/* no byte-swap required; chip endian set during init */
writew(*bufp++, ep_data);
count -= 2;
}
buf = (u8 *)bufp;
/* write final byte by placing the NET2272 into 8-bit mode */
if (unlikely(count)) {
tmp = net2272_read(ep->dev, LOCCTL);
net2272_write(ep->dev, LOCCTL, tmp & ~(1 << DATA_WIDTH));
writeb(*buf, ep_data);
net2272_write(ep->dev, LOCCTL, tmp);
}
return length;
}
/* returns: 0: still running, 1: completed, negative: errno */
static int
net2272_write_fifo(struct net2272_ep *ep, struct net2272_request *req)
{
u8 *buf;
unsigned count, max;
int status;
dev_vdbg(ep->dev->dev, "write_fifo %s actual %d len %d\n",
ep->ep.name, req->req.actual, req->req.length);
/*
* Keep loading the endpoint until the final packet is loaded,
* or the endpoint buffer is full.
*/
top:
/*
* Clear interrupt status
* - Packet Transmitted interrupt will become set again when the
* host successfully takes another packet
*/
net2272_ep_write(ep, EP_STAT0, (1 << DATA_PACKET_TRANSMITTED_INTERRUPT));
while (!(net2272_ep_read(ep, EP_STAT0) & (1 << BUFFER_FULL))) {
buf = req->req.buf + req->req.actual;
prefetch(buf);
/* force pagesel */
net2272_ep_read(ep, EP_STAT0);
max = (net2272_ep_read(ep, EP_AVAIL1) << 8) |
(net2272_ep_read(ep, EP_AVAIL0));
if (max < ep->ep.maxpacket)
max = (net2272_ep_read(ep, EP_AVAIL1) << 8)
| (net2272_ep_read(ep, EP_AVAIL0));
count = net2272_write_packet(ep, buf, req, max);
/* see if we are done */
if (req->req.length == req->req.actual) {
/* validate short or zlp packet */
if (count < ep->ep.maxpacket)
set_fifo_bytecount(ep, 0);
net2272_done(ep, req, 0);
if (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next,
struct net2272_request,
queue);
status = net2272_kick_dma(ep, req);
if (status < 0)
if ((net2272_ep_read(ep, EP_STAT0)
& (1 << BUFFER_EMPTY)))
goto top;
}
return 1;
}
net2272_ep_write(ep, EP_STAT0, (1 << DATA_PACKET_TRANSMITTED_INTERRUPT));
}
return 0;
}
static void
net2272_out_flush(struct net2272_ep *ep)
{
ASSERT_OUT_NAKING(ep);
net2272_ep_write(ep, EP_STAT0, (1 << DATA_OUT_TOKEN_INTERRUPT)
| (1 << DATA_PACKET_RECEIVED_INTERRUPT));
net2272_ep_write(ep, EP_STAT1, 1 << BUFFER_FLUSH);
}
static int
net2272_read_packet(struct net2272_ep *ep, u8 *buf,
struct net2272_request *req, unsigned avail)
{
u16 __iomem *ep_data = net2272_reg_addr(ep->dev, EP_DATA);
unsigned is_short;
u16 *bufp;
req->req.actual += avail;
dev_vdbg(ep->dev->dev, "read packet %s req %p len %u avail %u\n",
ep->ep.name, req, avail,
(net2272_ep_read(ep, EP_AVAIL1) << 8) | net2272_ep_read(ep, EP_AVAIL0));
is_short = (avail < ep->ep.maxpacket);
if (unlikely(avail == 0)) {
/* remove any zlp from the buffer */
(void)readw(ep_data);
return is_short;
}
/* Ensure we get the final byte */
if (unlikely(avail % 2))
avail++;
bufp = (u16 *)buf;
do {
*bufp++ = readw(ep_data);
avail -= 2;
} while (avail);
/*
* To avoid false endpoint available race condition must read
* ep stat0 twice in the case of a short transfer
*/
if (net2272_ep_read(ep, EP_STAT0) & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT))
net2272_ep_read(ep, EP_STAT0);
return is_short;
}
static int
net2272_read_fifo(struct net2272_ep *ep, struct net2272_request *req)
{
u8 *buf;
unsigned is_short;
int count;
int tmp;
int cleanup = 0;
int status = -1;
dev_vdbg(ep->dev->dev, "read_fifo %s actual %d len %d\n",
ep->ep.name, req->req.actual, req->req.length);
top:
do {
buf = req->req.buf + req->req.actual;
prefetchw(buf);
count = (net2272_ep_read(ep, EP_AVAIL1) << 8)
| net2272_ep_read(ep, EP_AVAIL0);
net2272_ep_write(ep, EP_STAT0,
(1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) |
(1 << DATA_PACKET_RECEIVED_INTERRUPT));
tmp = req->req.length - req->req.actual;
if (count > tmp) {
if ((tmp % ep->ep.maxpacket) != 0) {
dev_err(ep->dev->dev,
"%s out fifo %d bytes, expected %d\n",
ep->ep.name, count, tmp);
cleanup = 1;
}
count = (tmp > 0) ? tmp : 0;
}
is_short = net2272_read_packet(ep, buf, req, count);
/* completion */
if (unlikely(cleanup || is_short ||
req->req.actual == req->req.length)) {
if (cleanup) {
net2272_out_flush(ep);
net2272_done(ep, req, -EOVERFLOW);
} else
net2272_done(ep, req, 0);
/* re-initialize endpoint transfer registers
* otherwise they may result in erroneous pre-validation
* for subsequent control reads
*/
if (unlikely(ep->num == 0)) {
net2272_ep_write(ep, EP_TRANSFER2, 0);
net2272_ep_write(ep, EP_TRANSFER1, 0);
net2272_ep_write(ep, EP_TRANSFER0, 0);
}
if (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next,
struct net2272_request, queue);
status = net2272_kick_dma(ep, req);
if ((status < 0) &&
!(net2272_ep_read(ep, EP_STAT0) & (1 << BUFFER_EMPTY)))
goto top;
}
return 1;
}
} while (!(net2272_ep_read(ep, EP_STAT0) & (1 << BUFFER_EMPTY)));
return 0;
}
static void
net2272_pio_advance(struct net2272_ep *ep)
{
struct net2272_request *req;
if (unlikely(list_empty(&ep->queue)))
return;
req = list_entry(ep->queue.next, struct net2272_request, queue);
(ep->is_in ? net2272_write_fifo : net2272_read_fifo)(ep, req);
}
/* returns 0 on success, else negative errno */
static int
net2272_request_dma(struct net2272 *dev, unsigned ep, u32 buf,
unsigned len, unsigned dir)
{
dev_vdbg(dev->dev, "request_dma ep %d buf %08x len %d dir %d\n",
ep, buf, len, dir);
/* The NET2272 only supports a single dma channel */
if (dev->dma_busy)
return -EBUSY;
/*
* EP_TRANSFER (used to determine the number of bytes received
* in an OUT transfer) is 24 bits wide; don't ask for more than that.
*/
if ((dir == 1) && (len > 0x1000000))
return -EINVAL;
dev->dma_busy = 1;
/* initialize platform's dma */
#ifdef CONFIG_USB_PCI
/* NET2272 addr, buffer addr, length, etc. */
switch (dev->dev_id) {
case PCI_DEVICE_ID_RDK1:
/* Setup PLX 9054 DMA mode */
writel((1 << LOCAL_BUS_WIDTH) |
(1 << TA_READY_INPUT_ENABLE) |
(0 << LOCAL_BURST_ENABLE) |
(1 << DONE_INTERRUPT_ENABLE) |
(1 << LOCAL_ADDRESSING_MODE) |
(1 << DEMAND_MODE) |
(1 << DMA_EOT_ENABLE) |
(1 << FAST_SLOW_TERMINATE_MODE_SELECT) |
(1 << DMA_CHANNEL_INTERRUPT_SELECT),
dev->rdk1.plx9054_base_addr + DMAMODE0);
writel(0x100000, dev->rdk1.plx9054_base_addr + DMALADR0);
writel(buf, dev->rdk1.plx9054_base_addr + DMAPADR0);
writel(len, dev->rdk1.plx9054_base_addr + DMASIZ0);
writel((dir << DIRECTION_OF_TRANSFER) |
(1 << INTERRUPT_AFTER_TERMINAL_COUNT),
dev->rdk1.plx9054_base_addr + DMADPR0);
writel((1 << LOCAL_DMA_CHANNEL_0_INTERRUPT_ENABLE) |
readl(dev->rdk1.plx9054_base_addr + INTCSR),
dev->rdk1.plx9054_base_addr + INTCSR);
break;
}
#endif
net2272_write(dev, DMAREQ,
(0 << DMA_BUFFER_VALID) |
(1 << DMA_REQUEST_ENABLE) |
(1 << DMA_CONTROL_DACK) |
(dev->dma_eot_polarity << EOT_POLARITY) |
(dev->dma_dack_polarity << DACK_POLARITY) |
(dev->dma_dreq_polarity << DREQ_POLARITY) |
((ep >> 1) << DMA_ENDPOINT_SELECT));
(void) net2272_read(dev, SCRATCH);
return 0;
}
static void
net2272_start_dma(struct net2272 *dev)
{
/* start platform's dma controller */
#ifdef CONFIG_USB_PCI
switch (dev->dev_id) {
case PCI_DEVICE_ID_RDK1:
writeb((1 << CHANNEL_ENABLE) | (1 << CHANNEL_START),
dev->rdk1.plx9054_base_addr + DMACSR0);
break;
}
#endif
}
/* returns 0 on success, else negative errno */
static int
net2272_kick_dma(struct net2272_ep *ep, struct net2272_request *req)
{
unsigned size;
u8 tmp;
if (!use_dma || (ep->num < 1) || (ep->num > 2) || !ep->dma)
return -EINVAL;
/* don't use dma for odd-length transfers
* otherwise, we'd need to deal with the last byte with pio
*/
if (req->req.length & 1)
return -EINVAL;
dev_vdbg(ep->dev->dev, "kick_dma %s req %p dma %08llx\n",
ep->ep.name, req, (unsigned long long) req->req.dma);
net2272_ep_write(ep, EP_RSPSET, 1 << ALT_NAK_OUT_PACKETS);
/* The NET2272 can only use DMA on one endpoint at a time */
if (ep->dev->dma_busy)
return -EBUSY;
/* Make sure we only DMA an even number of bytes (we'll use
* pio to complete the transfer)
*/
size = req->req.length;
size &= ~1;
/* device-to-host transfer */
if (ep->is_in) {
/* initialize platform's dma controller */
if (net2272_request_dma(ep->dev, ep->num, req->req.dma, size, 0))
/* unable to obtain DMA channel; return error and use pio mode */
return -EBUSY;
req->req.actual += size;
/* host-to-device transfer */
} else {
tmp = net2272_ep_read(ep, EP_STAT0);
/* initialize platform's dma controller */
if (net2272_request_dma(ep->dev, ep->num, req->req.dma, size, 1))
/* unable to obtain DMA channel; return error and use pio mode */
return -EBUSY;
if (!(tmp & (1 << BUFFER_EMPTY)))
ep->not_empty = 1;
else
ep->not_empty = 0;
/* allow the endpoint's buffer to fill */
net2272_ep_write(ep, EP_RSPCLR, 1 << ALT_NAK_OUT_PACKETS);
/* this transfer completed and data's already in the fifo
* return error so pio gets used.
*/
if (tmp & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
/* deassert dreq */
net2272_write(ep->dev, DMAREQ,
(0 << DMA_BUFFER_VALID) |
(0 << DMA_REQUEST_ENABLE) |
(1 << DMA_CONTROL_DACK) |
(ep->dev->dma_eot_polarity << EOT_POLARITY) |
(ep->dev->dma_dack_polarity << DACK_POLARITY) |
(ep->dev->dma_dreq_polarity << DREQ_POLARITY) |
((ep->num >> 1) << DMA_ENDPOINT_SELECT));
return -EBUSY;
}
}
/* Don't use per-packet interrupts: use dma interrupts only */
net2272_ep_write(ep, EP_IRQENB, 0);
net2272_start_dma(ep->dev);
return 0;
}
static void net2272_cancel_dma(struct net2272 *dev)
{
#ifdef CONFIG_USB_PCI
switch (dev->dev_id) {
case PCI_DEVICE_ID_RDK1:
writeb(0, dev->rdk1.plx9054_base_addr + DMACSR0);
writeb(1 << CHANNEL_ABORT, dev->rdk1.plx9054_base_addr + DMACSR0);
while (!(readb(dev->rdk1.plx9054_base_addr + DMACSR0) &
(1 << CHANNEL_DONE)))
continue; /* wait for dma to stabalize */
/* dma abort generates an interrupt */
writeb(1 << CHANNEL_CLEAR_INTERRUPT,
dev->rdk1.plx9054_base_addr + DMACSR0);
break;
}
#endif
dev->dma_busy = 0;
}
/*---------------------------------------------------------------------------*/
static int
net2272_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
{
struct net2272_request *req;
struct net2272_ep *ep;
struct net2272 *dev;
unsigned long flags;
int status = -1;
u8 s;
req = container_of(_req, struct net2272_request, req);
if (!_req || !_req->complete || !_req->buf
|| !list_empty(&req->queue))
return -EINVAL;
ep = container_of(_ep, struct net2272_ep, ep);
if (!_ep || (!ep->desc && ep->num != 0))
return -EINVAL;
dev = ep->dev;
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
/* set up dma mapping in case the caller didn't */
if (use_dma && ep->dma) {
status = usb_gadget_map_request(&dev->gadget, _req,
ep->is_in);
if (status)
return status;
}
dev_vdbg(dev->dev, "%s queue req %p, len %d buf %p dma %08llx %s\n",
_ep->name, _req, _req->length, _req->buf,
(unsigned long long) _req->dma, _req->zero ? "zero" : "!zero");
spin_lock_irqsave(&dev->lock, flags);
_req->status = -EINPROGRESS;
_req->actual = 0;
/* kickstart this i/o queue? */
if (list_empty(&ep->queue) && !ep->stopped) {
/* maybe there's no control data, just status ack */
if (ep->num == 0 && _req->length == 0) {
net2272_done(ep, req, 0);
dev_vdbg(dev->dev, "%s status ack\n", ep->ep.name);
goto done;
}
/* Return zlp, don't let it block subsequent packets */
s = net2272_ep_read(ep, EP_STAT0);
if (s & (1 << BUFFER_EMPTY)) {
/* Buffer is empty check for a blocking zlp, handle it */
if ((s & (1 << NAK_OUT_PACKETS)) &&
net2272_ep_read(ep, EP_STAT1) & (1 << LOCAL_OUT_ZLP)) {
dev_dbg(dev->dev, "WARNING: returning ZLP short packet termination!\n");
/*
* Request is going to terminate with a short packet ...
* hope the client is ready for it!
*/
status = net2272_read_fifo(ep, req);
/* clear short packet naking */
net2272_ep_write(ep, EP_STAT0, (1 << NAK_OUT_PACKETS));
goto done;
}
}
/* try dma first */
status = net2272_kick_dma(ep, req);
if (status < 0) {
/* dma failed (most likely in use by another endpoint)
* fallback to pio
*/
status = 0;
if (ep->is_in)
status = net2272_write_fifo(ep, req);
else {
s = net2272_ep_read(ep, EP_STAT0);
if ((s & (1 << BUFFER_EMPTY)) == 0)
status = net2272_read_fifo(ep, req);
}
if (unlikely(status != 0)) {
if (status > 0)
status = 0;
req = NULL;
}
}
}
if (likely(req))
list_add_tail(&req->queue, &ep->queue);
if (likely(!list_empty(&ep->queue)))
net2272_ep_write(ep, EP_RSPCLR, 1 << ALT_NAK_OUT_PACKETS);
done:
spin_unlock_irqrestore(&dev->lock, flags);
return 0;
}
/* dequeue ALL requests */
static void
net2272_dequeue_all(struct net2272_ep *ep)
{
struct net2272_request *req;
/* called with spinlock held */
ep->stopped = 1;
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next,
struct net2272_request,
queue);
net2272_done(ep, req, -ESHUTDOWN);
}
}
/* dequeue JUST ONE request */
static int
net2272_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
struct net2272_ep *ep;
struct net2272_request *req;
unsigned long flags;
int stopped;
ep = container_of(_ep, struct net2272_ep, ep);
if (!_ep || (!ep->desc && ep->num != 0) || !_req)
return -EINVAL;
spin_lock_irqsave(&ep->dev->lock, flags);
stopped = ep->stopped;
ep->stopped = 1;
/* make sure it's still queued on this endpoint */
list_for_each_entry(req, &ep->queue, queue) {
if (&req->req == _req)
break;
}
if (&req->req != _req) {
ep->stopped = stopped;
spin_unlock_irqrestore(&ep->dev->lock, flags);
return -EINVAL;
}
/* queue head may be partially complete */
if (ep->queue.next == &req->queue) {
dev_dbg(ep->dev->dev, "unlink (%s) pio\n", _ep->name);
net2272_done(ep, req, -ECONNRESET);
}
req = NULL;
ep->stopped = stopped;
spin_unlock_irqrestore(&ep->dev->lock, flags);
return 0;
}
/*---------------------------------------------------------------------------*/
static int
net2272_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
{
struct net2272_ep *ep;
unsigned long flags;
int ret = 0;
ep = container_of(_ep, struct net2272_ep, ep);
if (!_ep || (!ep->desc && ep->num != 0))
return -EINVAL;
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
if (ep->desc /* not ep0 */ && usb_endpoint_xfer_isoc(ep->desc))
return -EINVAL;
spin_lock_irqsave(&ep->dev->lock, flags);
if (!list_empty(&ep->queue))
ret = -EAGAIN;
else if (ep->is_in && value && net2272_fifo_status(_ep) != 0)
ret = -EAGAIN;
else {
dev_vdbg(ep->dev->dev, "%s %s %s\n", _ep->name,
value ? "set" : "clear",
wedged ? "wedge" : "halt");
/* set/clear */
if (value) {
if (ep->num == 0)
ep->dev->protocol_stall = 1;
else
set_halt(ep);
if (wedged)
ep->wedged = 1;
} else {
clear_halt(ep);
ep->wedged = 0;
}
}
spin_unlock_irqrestore(&ep->dev->lock, flags);
return ret;
}
static int
net2272_set_halt(struct usb_ep *_ep, int value)
{
return net2272_set_halt_and_wedge(_ep, value, 0);
}
static int
net2272_set_wedge(struct usb_ep *_ep)
{
if (!_ep || _ep->name == ep0name)
return -EINVAL;
return net2272_set_halt_and_wedge(_ep, 1, 1);
}
static int
net2272_fifo_status(struct usb_ep *_ep)
{
struct net2272_ep *ep;
u16 avail;
ep = container_of(_ep, struct net2272_ep, ep);
if (!_ep || (!ep->desc && ep->num != 0))
return -ENODEV;
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
avail = net2272_ep_read(ep, EP_AVAIL1) << 8;
avail |= net2272_ep_read(ep, EP_AVAIL0);
if (avail > ep->fifo_size)
return -EOVERFLOW;
if (ep->is_in)
avail = ep->fifo_size - avail;
return avail;
}
static void
net2272_fifo_flush(struct usb_ep *_ep)
{
struct net2272_ep *ep;
ep = container_of(_ep, struct net2272_ep, ep);
if (!_ep || (!ep->desc && ep->num != 0))
return;
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
return;
net2272_ep_write(ep, EP_STAT1, 1 << BUFFER_FLUSH);
}
static const struct usb_ep_ops net2272_ep_ops = {
.enable = net2272_enable,
.disable = net2272_disable,
.alloc_request = net2272_alloc_request,
.free_request = net2272_free_request,
.queue = net2272_queue,
.dequeue = net2272_dequeue,
.set_halt = net2272_set_halt,
.set_wedge = net2272_set_wedge,
.fifo_status = net2272_fifo_status,
.fifo_flush = net2272_fifo_flush,
};
/*---------------------------------------------------------------------------*/
static int
net2272_get_frame(struct usb_gadget *_gadget)
{
struct net2272 *dev;
unsigned long flags;
u16 ret;
if (!_gadget)
return -ENODEV;
dev = container_of(_gadget, struct net2272, gadget);
spin_lock_irqsave(&dev->lock, flags);
ret = net2272_read(dev, FRAME1) << 8;
ret |= net2272_read(dev, FRAME0);
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static int
net2272_wakeup(struct usb_gadget *_gadget)
{
struct net2272 *dev;
u8 tmp;
unsigned long flags;
if (!_gadget)
return 0;
dev = container_of(_gadget, struct net2272, gadget);
spin_lock_irqsave(&dev->lock, flags);
tmp = net2272_read(dev, USBCTL0);
if (tmp & (1 << IO_WAKEUP_ENABLE))
net2272_write(dev, USBCTL1, (1 << GENERATE_RESUME));
spin_unlock_irqrestore(&dev->lock, flags);
return 0;
}
static int
net2272_set_selfpowered(struct usb_gadget *_gadget, int value)
{
if (!_gadget)
return -ENODEV;
_gadget->is_selfpowered = (value != 0);
return 0;
}
static int
net2272_pullup(struct usb_gadget *_gadget, int is_on)
{
struct net2272 *dev;
u8 tmp;
unsigned long flags;
if (!_gadget)
return -ENODEV;
dev = container_of(_gadget, struct net2272, gadget);
spin_lock_irqsave(&dev->lock, flags);
tmp = net2272_read(dev, USBCTL0);
dev->softconnect = (is_on != 0);
if (is_on)
tmp |= (1 << USB_DETECT_ENABLE);
else
tmp &= ~(1 << USB_DETECT_ENABLE);
net2272_write(dev, USBCTL0, tmp);
spin_unlock_irqrestore(&dev->lock, flags);
return 0;
}
static int net2272_start(struct usb_gadget *_gadget,
struct usb_gadget_driver *driver);
static int net2272_stop(struct usb_gadget *_gadget);
static const struct usb_gadget_ops net2272_ops = {
.get_frame = net2272_get_frame,
.wakeup = net2272_wakeup,
.set_selfpowered = net2272_set_selfpowered,
.pullup = net2272_pullup,
.udc_start = net2272_start,
.udc_stop = net2272_stop,
};
/*---------------------------------------------------------------------------*/
static ssize_t
registers_show(struct device *_dev, struct device_attribute *attr, char *buf)
{
struct net2272 *dev;
char *next;
unsigned size, t;
unsigned long flags;
u8 t1, t2;
int i;
const char *s;
dev = dev_get_drvdata(_dev);
next = buf;
size = PAGE_SIZE;
spin_lock_irqsave(&dev->lock, flags);
if (dev->driver)
s = dev->driver->driver.name;
else
s = "(none)";
/* Main Control Registers */
t = scnprintf(next, size, "%s version %s,"
"chiprev %02x, locctl %02x\n"
"irqenb0 %02x irqenb1 %02x "
"irqstat0 %02x irqstat1 %02x\n",
driver_name, driver_vers, dev->chiprev,
net2272_read(dev, LOCCTL),
net2272_read(dev, IRQENB0),
net2272_read(dev, IRQENB1),
net2272_read(dev, IRQSTAT0),
net2272_read(dev, IRQSTAT1));
size -= t;
next += t;
/* DMA */
t1 = net2272_read(dev, DMAREQ);
t = scnprintf(next, size, "\ndmareq %02x: %s %s%s%s%s\n",
t1, ep_name[(t1 & 0x01) + 1],
t1 & (1 << DMA_CONTROL_DACK) ? "dack " : "",
t1 & (1 << DMA_REQUEST_ENABLE) ? "reqenb " : "",
t1 & (1 << DMA_REQUEST) ? "req " : "",
t1 & (1 << DMA_BUFFER_VALID) ? "valid " : "");
size -= t;
next += t;
/* USB Control Registers */
t1 = net2272_read(dev, USBCTL1);
if (t1 & (1 << VBUS_PIN)) {
if (t1 & (1 << USB_HIGH_SPEED))
s = "high speed";
else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
s = "powered";
else
s = "full speed";
} else
s = "not attached";
t = scnprintf(next, size,
"usbctl0 %02x usbctl1 %02x addr 0x%02x (%s)\n",
net2272_read(dev, USBCTL0), t1,
net2272_read(dev, OURADDR), s);
size -= t;
next += t;
/* Endpoint Registers */
for (i = 0; i < 4; ++i) {
struct net2272_ep *ep;
ep = &dev->ep[i];
if (i && !ep->desc)
continue;
t1 = net2272_ep_read(ep, EP_CFG);
t2 = net2272_ep_read(ep, EP_RSPSET);
t = scnprintf(next, size,
"\n%s\tcfg %02x rsp (%02x) %s%s%s%s%s%s%s%s"
"irqenb %02x\n",
ep->ep.name, t1, t2,
(t2 & (1 << ALT_NAK_OUT_PACKETS)) ? "NAK " : "",
(t2 & (1 << HIDE_STATUS_PHASE)) ? "hide " : "",
(t2 & (1 << AUTOVALIDATE)) ? "auto " : "",
(t2 & (1 << INTERRUPT_MODE)) ? "interrupt " : "",
(t2 & (1 << CONTROL_STATUS_PHASE_HANDSHAKE)) ? "status " : "",
(t2 & (1 << NAK_OUT_PACKETS_MODE)) ? "NAKmode " : "",
(t2 & (1 << ENDPOINT_TOGGLE)) ? "DATA1 " : "DATA0 ",
(t2 & (1 << ENDPOINT_HALT)) ? "HALT " : "",
net2272_ep_read(ep, EP_IRQENB));
size -= t;
next += t;
t = scnprintf(next, size,
"\tstat0 %02x stat1 %02x avail %04x "
"(ep%d%s-%s)%s\n",
net2272_ep_read(ep, EP_STAT0),
net2272_ep_read(ep, EP_STAT1),
(net2272_ep_read(ep, EP_AVAIL1) << 8) | net2272_ep_read(ep, EP_AVAIL0),
t1 & 0x0f,
ep->is_in ? "in" : "out",
type_string(t1 >> 5),
ep->stopped ? "*" : "");
size -= t;
next += t;
t = scnprintf(next, size,
"\tep_transfer %06x\n",
((net2272_ep_read(ep, EP_TRANSFER2) & 0xff) << 16) |
((net2272_ep_read(ep, EP_TRANSFER1) & 0xff) << 8) |
((net2272_ep_read(ep, EP_TRANSFER0) & 0xff)));
size -= t;
next += t;
t1 = net2272_ep_read(ep, EP_BUFF_STATES) & 0x03;
t2 = (net2272_ep_read(ep, EP_BUFF_STATES) >> 2) & 0x03;
t = scnprintf(next, size,
"\tbuf-a %s buf-b %s\n",
buf_state_string(t1),
buf_state_string(t2));
size -= t;
next += t;
}
spin_unlock_irqrestore(&dev->lock, flags);
return PAGE_SIZE - size;
}
static DEVICE_ATTR_RO(registers);
/*---------------------------------------------------------------------------*/
static void
net2272_set_fifo_mode(struct net2272 *dev, int mode)
{
u8 tmp;
tmp = net2272_read(dev, LOCCTL) & 0x3f;
tmp |= (mode << 6);
net2272_write(dev, LOCCTL, tmp);
INIT_LIST_HEAD(&dev->gadget.ep_list);
/* always ep-a, ep-c ... maybe not ep-b */
list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
switch (mode) {
case 0:
list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
dev->ep[1].fifo_size = dev->ep[2].fifo_size = 512;
break;
case 1:
list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
dev->ep[1].fifo_size = 1024;
dev->ep[2].fifo_size = 512;
break;
case 2:
list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
break;
case 3:
dev->ep[1].fifo_size = 1024;
break;
}
/* ep-c is always 2 512 byte buffers */
list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
dev->ep[3].fifo_size = 512;
}
/*---------------------------------------------------------------------------*/
static void
net2272_usb_reset(struct net2272 *dev)
{
dev->gadget.speed = USB_SPEED_UNKNOWN;
net2272_cancel_dma(dev);
net2272_write(dev, IRQENB0, 0);
net2272_write(dev, IRQENB1, 0);
/* clear irq state */
net2272_write(dev, IRQSTAT0, 0xff);
net2272_write(dev, IRQSTAT1, ~(1 << SUSPEND_REQUEST_INTERRUPT));
net2272_write(dev, DMAREQ,
(0 << DMA_BUFFER_VALID) |
(0 << DMA_REQUEST_ENABLE) |
(1 << DMA_CONTROL_DACK) |
(dev->dma_eot_polarity << EOT_POLARITY) |
(dev->dma_dack_polarity << DACK_POLARITY) |
(dev->dma_dreq_polarity << DREQ_POLARITY) |
((dma_ep >> 1) << DMA_ENDPOINT_SELECT));
net2272_cancel_dma(dev);
net2272_set_fifo_mode(dev, (fifo_mode <= 3) ? fifo_mode : 0);
/* Set the NET2272 ep fifo data width to 16-bit mode and for correct byte swapping
* note that the higher level gadget drivers are expected to convert data to little endian.
* Enable byte swap for your local bus/cpu if needed by setting BYTE_SWAP in LOCCTL here
*/
net2272_write(dev, LOCCTL, net2272_read(dev, LOCCTL) | (1 << DATA_WIDTH));
net2272_write(dev, LOCCTL1, (dma_mode << DMA_MODE));
}
static void
net2272_usb_reinit(struct net2272 *dev)
{
int i;
/* basic endpoint init */
for (i = 0; i < 4; ++i) {
struct net2272_ep *ep = &dev->ep[i];
ep->ep.name = ep_name[i];
ep->dev = dev;
ep->num = i;
ep->not_empty = 0;
if (use_dma && ep->num == dma_ep)
ep->dma = 1;
if (i > 0 && i <= 3)
ep->fifo_size = 512;
else
ep->fifo_size = 64;
net2272_ep_reset(ep);
if (i == 0) {
ep->ep.caps.type_control = true;
} else {
ep->ep.caps.type_iso = true;
ep->ep.caps.type_bulk = true;
ep->ep.caps.type_int = true;
}
ep->ep.caps.dir_in = true;
ep->ep.caps.dir_out = true;
}
usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
dev->gadget.ep0 = &dev->ep[0].ep;
dev->ep[0].stopped = 0;
INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
}
static void
net2272_ep0_start(struct net2272 *dev)
{
struct net2272_ep *ep0 = &dev->ep[0];
net2272_ep_write(ep0, EP_RSPSET,
(1 << NAK_OUT_PACKETS_MODE) |
(1 << ALT_NAK_OUT_PACKETS));
net2272_ep_write(ep0, EP_RSPCLR,
(1 << HIDE_STATUS_PHASE) |
(1 << CONTROL_STATUS_PHASE_HANDSHAKE));
net2272_write(dev, USBCTL0,
(dev->softconnect << USB_DETECT_ENABLE) |
(1 << USB_ROOT_PORT_WAKEUP_ENABLE) |
(1 << IO_WAKEUP_ENABLE));
net2272_write(dev, IRQENB0,
(1 << SETUP_PACKET_INTERRUPT_ENABLE) |
(1 << ENDPOINT_0_INTERRUPT_ENABLE) |
(1 << DMA_DONE_INTERRUPT_ENABLE));
net2272_write(dev, IRQENB1,
(1 << VBUS_INTERRUPT_ENABLE) |
(1 << ROOT_PORT_RESET_INTERRUPT_ENABLE) |
(1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE));
}
/* when a driver is successfully registered, it will receive
* control requests including set_configuration(), which enables
* non-control requests. then usb traffic follows until a
* disconnect is reported. then a host may connect again, or
* the driver might get unbound.
*/
static int net2272_start(struct usb_gadget *_gadget,
struct usb_gadget_driver *driver)
{
struct net2272 *dev;
unsigned i;
if (!driver || !driver->setup ||
driver->max_speed != USB_SPEED_HIGH)
return -EINVAL;
dev = container_of(_gadget, struct net2272, gadget);
for (i = 0; i < 4; ++i)
dev->ep[i].irqs = 0;
/* hook up the driver ... */
dev->softconnect = 1;
driver->driver.bus = NULL;
dev->driver = driver;
/* ... then enable host detection and ep0; and we're ready
* for set_configuration as well as eventual disconnect.
*/
net2272_ep0_start(dev);
return 0;
}
static void
stop_activity(struct net2272 *dev, struct usb_gadget_driver *driver)
{
int i;
/* don't disconnect if it's not connected */
if (dev->gadget.speed == USB_SPEED_UNKNOWN)
driver = NULL;
/* stop hardware; prevent new request submissions;
* and kill any outstanding requests.
*/
net2272_usb_reset(dev);
for (i = 0; i < 4; ++i)
net2272_dequeue_all(&dev->ep[i]);
/* report disconnect; the driver is already quiesced */
if (driver) {
spin_unlock(&dev->lock);
driver->disconnect(&dev->gadget);
spin_lock(&dev->lock);
}
net2272_usb_reinit(dev);
}
static int net2272_stop(struct usb_gadget *_gadget)
{
struct net2272 *dev;
unsigned long flags;
dev = container_of(_gadget, struct net2272, gadget);
spin_lock_irqsave(&dev->lock, flags);
stop_activity(dev, NULL);
spin_unlock_irqrestore(&dev->lock, flags);
dev->driver = NULL;
return 0;
}
/*---------------------------------------------------------------------------*/
/* handle ep-a/ep-b dma completions */
static void
net2272_handle_dma(struct net2272_ep *ep)
{
struct net2272_request *req;
unsigned len;
int status;
if (!list_empty(&ep->queue))
req = list_entry(ep->queue.next,
struct net2272_request, queue);
else
req = NULL;
dev_vdbg(ep->dev->dev, "handle_dma %s req %p\n", ep->ep.name, req);
/* Ensure DREQ is de-asserted */
net2272_write(ep->dev, DMAREQ,
(0 << DMA_BUFFER_VALID)
| (0 << DMA_REQUEST_ENABLE)
| (1 << DMA_CONTROL_DACK)
| (ep->dev->dma_eot_polarity << EOT_POLARITY)
| (ep->dev->dma_dack_polarity << DACK_POLARITY)
| (ep->dev->dma_dreq_polarity << DREQ_POLARITY)
| (ep->dma << DMA_ENDPOINT_SELECT));
ep->dev->dma_busy = 0;
net2272_ep_write(ep, EP_IRQENB,
(1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
| (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE)
| net2272_ep_read(ep, EP_IRQENB));
/* device-to-host transfer completed */
if (ep->is_in) {
/* validate a short packet or zlp if necessary */
if ((req->req.length % ep->ep.maxpacket != 0) ||
req->req.zero)
set_fifo_bytecount(ep, 0);
net2272_done(ep, req, 0);
if (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next,
struct net2272_request, queue);
status = net2272_kick_dma(ep, req);
if (status < 0)
net2272_pio_advance(ep);
}
/* host-to-device transfer completed */
} else {
/* terminated with a short packet? */
if (net2272_read(ep->dev, IRQSTAT0) &
(1 << DMA_DONE_INTERRUPT)) {
/* abort system dma */
net2272_cancel_dma(ep->dev);
}
/* EP_TRANSFER will contain the number of bytes
* actually received.
* NOTE: There is no overflow detection on EP_TRANSFER:
* We can't deal with transfers larger than 2^24 bytes!
*/
len = (net2272_ep_read(ep, EP_TRANSFER2) << 16)
| (net2272_ep_read(ep, EP_TRANSFER1) << 8)
| (net2272_ep_read(ep, EP_TRANSFER0));
if (ep->not_empty)
len += 4;
req->req.actual += len;
/* get any remaining data */
net2272_pio_advance(ep);
}
}
/*---------------------------------------------------------------------------*/
static void
net2272_handle_ep(struct net2272_ep *ep)
{
struct net2272_request *req;
u8 stat0, stat1;
if (!list_empty(&ep->queue))
req = list_entry(ep->queue.next,
struct net2272_request, queue);
else
req = NULL;
/* ack all, and handle what we care about */
stat0 = net2272_ep_read(ep, EP_STAT0);
stat1 = net2272_ep_read(ep, EP_STAT1);
ep->irqs++;
dev_vdbg(ep->dev->dev, "%s ack ep_stat0 %02x, ep_stat1 %02x, req %p\n",
ep->ep.name, stat0, stat1, req ? &req->req : NULL);
net2272_ep_write(ep, EP_STAT0, stat0 &
~((1 << NAK_OUT_PACKETS)
| (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)));
net2272_ep_write(ep, EP_STAT1, stat1);
/* data packet(s) received (in the fifo, OUT)
* direction must be validated, otherwise control read status phase
* could be interpreted as a valid packet
*/
if (!ep->is_in && (stat0 & (1 << DATA_PACKET_RECEIVED_INTERRUPT)))
net2272_pio_advance(ep);
/* data packet(s) transmitted (IN) */
else if (stat0 & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT))
net2272_pio_advance(ep);
}
static struct net2272_ep *
net2272_get_ep_by_addr(struct net2272 *dev, u16 wIndex)
{
struct net2272_ep *ep;
if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
return &dev->ep[0];
list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
u8 bEndpointAddress;
if (!ep->desc)
continue;
bEndpointAddress = ep->desc->bEndpointAddress;
if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
continue;
if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
return ep;
}
return NULL;
}
/*
* USB Test Packet:
* JKJKJKJK * 9
* JJKKJJKK * 8
* JJJJKKKK * 8
* JJJJJJJKKKKKKK * 8
* JJJJJJJK * 8
* {JKKKKKKK * 10}, JK
*/
static const u8 net2272_test_packet[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFD, 0x7E
};
static void
net2272_set_test_mode(struct net2272 *dev, int mode)
{
int i;
/* Disable all net2272 interrupts:
* Nothing but a power cycle should stop the test.
*/
net2272_write(dev, IRQENB0, 0x00);
net2272_write(dev, IRQENB1, 0x00);
/* Force tranceiver to high-speed */
net2272_write(dev, XCVRDIAG, 1 << FORCE_HIGH_SPEED);
net2272_write(dev, PAGESEL, 0);
net2272_write(dev, EP_STAT0, 1 << DATA_PACKET_TRANSMITTED_INTERRUPT);
net2272_write(dev, EP_RSPCLR,
(1 << CONTROL_STATUS_PHASE_HANDSHAKE)
| (1 << HIDE_STATUS_PHASE));
net2272_write(dev, EP_CFG, 1 << ENDPOINT_DIRECTION);
net2272_write(dev, EP_STAT1, 1 << BUFFER_FLUSH);
/* wait for status phase to complete */
while (!(net2272_read(dev, EP_STAT0) &
(1 << DATA_PACKET_TRANSMITTED_INTERRUPT)))
;
/* Enable test mode */
net2272_write(dev, USBTEST, mode);
/* load test packet */
if (mode == TEST_PACKET) {
/* switch to 8 bit mode */
net2272_write(dev, LOCCTL, net2272_read(dev, LOCCTL) &
~(1 << DATA_WIDTH));
for (i = 0; i < sizeof(net2272_test_packet); ++i)
net2272_write(dev, EP_DATA, net2272_test_packet[i]);
/* Validate test packet */
net2272_write(dev, EP_TRANSFER0, 0);
}
}
static void
net2272_handle_stat0_irqs(struct net2272 *dev, u8 stat)
{
struct net2272_ep *ep;
u8 num, scratch;
/* starting a control request? */
if (unlikely(stat & (1 << SETUP_PACKET_INTERRUPT))) {
union {
u8 raw[8];
struct usb_ctrlrequest r;
} u;
int tmp = 0;
struct net2272_request *req;
if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
if (net2272_read(dev, USBCTL1) & (1 << USB_HIGH_SPEED))
dev->gadget.speed = USB_SPEED_HIGH;
else
dev->gadget.speed = USB_SPEED_FULL;
dev_dbg(dev->dev, "%s\n",
usb_speed_string(dev->gadget.speed));
}
ep = &dev->ep[0];
ep->irqs++;
/* make sure any leftover interrupt state is cleared */
stat &= ~(1 << ENDPOINT_0_INTERRUPT);
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next,
struct net2272_request, queue);
net2272_done(ep, req,
(req->req.actual == req->req.length) ? 0 : -EPROTO);
}
ep->stopped = 0;
dev->protocol_stall = 0;
net2272_ep_write(ep, EP_STAT0,
(1 << DATA_IN_TOKEN_INTERRUPT)
| (1 << DATA_OUT_TOKEN_INTERRUPT)
| (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
| (1 << DATA_PACKET_RECEIVED_INTERRUPT)
| (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT));
net2272_ep_write(ep, EP_STAT1,
(1 << TIMEOUT)
| (1 << USB_OUT_ACK_SENT)
| (1 << USB_OUT_NAK_SENT)
| (1 << USB_IN_ACK_RCVD)
| (1 << USB_IN_NAK_SENT)
| (1 << USB_STALL_SENT)
| (1 << LOCAL_OUT_ZLP));
/*
* Ensure Control Read pre-validation setting is beyond maximum size
* - Control Writes can leave non-zero values in EP_TRANSFER. If
* an EP0 transfer following the Control Write is a Control Read,
* the NET2272 sees the non-zero EP_TRANSFER as an unexpected
* pre-validation count.
* - Setting EP_TRANSFER beyond the maximum EP0 transfer size ensures
* the pre-validation count cannot cause an unexpected validatation
*/
net2272_write(dev, PAGESEL, 0);
net2272_write(dev, EP_TRANSFER2, 0xff);
net2272_write(dev, EP_TRANSFER1, 0xff);
net2272_write(dev, EP_TRANSFER0, 0xff);
u.raw[0] = net2272_read(dev, SETUP0);
u.raw[1] = net2272_read(dev, SETUP1);
u.raw[2] = net2272_read(dev, SETUP2);
u.raw[3] = net2272_read(dev, SETUP3);
u.raw[4] = net2272_read(dev, SETUP4);
u.raw[5] = net2272_read(dev, SETUP5);
u.raw[6] = net2272_read(dev, SETUP6);
u.raw[7] = net2272_read(dev, SETUP7);
/*
* If you have a big endian cpu make sure le16_to_cpus
* performs the proper byte swapping here...
*/
le16_to_cpus(&u.r.wValue);
le16_to_cpus(&u.r.wIndex);
le16_to_cpus(&u.r.wLength);
/* ack the irq */
net2272_write(dev, IRQSTAT0, 1 << SETUP_PACKET_INTERRUPT);
stat ^= (1 << SETUP_PACKET_INTERRUPT);
/* watch control traffic at the token level, and force
* synchronization before letting the status phase happen.
*/
ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
if (ep->is_in) {
scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE)
| (1 << DATA_OUT_TOKEN_INTERRUPT_ENABLE)
| (1 << DATA_IN_TOKEN_INTERRUPT_ENABLE);
stop_out_naking(ep);
} else
scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
| (1 << DATA_OUT_TOKEN_INTERRUPT_ENABLE)
| (1 << DATA_IN_TOKEN_INTERRUPT_ENABLE);
net2272_ep_write(ep, EP_IRQENB, scratch);
if ((u.r.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
goto delegate;
switch (u.r.bRequest) {
case USB_REQ_GET_STATUS: {
struct net2272_ep *e;
u16 status = 0;
switch (u.r.bRequestType & USB_RECIP_MASK) {
case USB_RECIP_ENDPOINT:
e = net2272_get_ep_by_addr(dev, u.r.wIndex);
if (!e || u.r.wLength > 2)
goto do_stall;
if (net2272_ep_read(e, EP_RSPSET) & (1 << ENDPOINT_HALT))
status = cpu_to_le16(1);
else
status = cpu_to_le16(0);
/* don't bother with a request object! */
net2272_ep_write(&dev->ep[0], EP_IRQENB, 0);
writew(status, net2272_reg_addr(dev, EP_DATA));
set_fifo_bytecount(&dev->ep[0], 0);
allow_status(ep);
dev_vdbg(dev->dev, "%s stat %02x\n",
ep->ep.name, status);
goto next_endpoints;
case USB_RECIP_DEVICE:
if (u.r.wLength > 2)
goto do_stall;
if (dev->gadget.is_selfpowered)
status = (1 << USB_DEVICE_SELF_POWERED);
/* don't bother with a request object! */
net2272_ep_write(&dev->ep[0], EP_IRQENB, 0);
writew(status, net2272_reg_addr(dev, EP_DATA));
set_fifo_bytecount(&dev->ep[0], 0);
allow_status(ep);
dev_vdbg(dev->dev, "device stat %02x\n", status);
goto next_endpoints;
case USB_RECIP_INTERFACE:
if (u.r.wLength > 2)
goto do_stall;
/* don't bother with a request object! */
net2272_ep_write(&dev->ep[0], EP_IRQENB, 0);
writew(status, net2272_reg_addr(dev, EP_DATA));
set_fifo_bytecount(&dev->ep[0], 0);
allow_status(ep);
dev_vdbg(dev->dev, "interface status %02x\n", status);
goto next_endpoints;
}
break;
}
case USB_REQ_CLEAR_FEATURE: {
struct net2272_ep *e;
if (u.r.bRequestType != USB_RECIP_ENDPOINT)
goto delegate;
if (u.r.wValue != USB_ENDPOINT_HALT ||
u.r.wLength != 0)
goto do_stall;
e = net2272_get_ep_by_addr(dev, u.r.wIndex);
if (!e)
goto do_stall;
if (e->wedged) {
dev_vdbg(dev->dev, "%s wedged, halt not cleared\n",
ep->ep.name);
} else {
dev_vdbg(dev->dev, "%s clear halt\n", ep->ep.name);
clear_halt(e);
}
allow_status(ep);
goto next_endpoints;
}
case USB_REQ_SET_FEATURE: {
struct net2272_ep *e;
if (u.r.bRequestType == USB_RECIP_DEVICE) {
if (u.r.wIndex != NORMAL_OPERATION)
net2272_set_test_mode(dev, (u.r.wIndex >> 8));
allow_status(ep);
dev_vdbg(dev->dev, "test mode: %d\n", u.r.wIndex);
goto next_endpoints;
} else if (u.r.bRequestType != USB_RECIP_ENDPOINT)
goto delegate;
if (u.r.wValue != USB_ENDPOINT_HALT ||
u.r.wLength != 0)
goto do_stall;
e = net2272_get_ep_by_addr(dev, u.r.wIndex);
if (!e)
goto do_stall;
set_halt(e);
allow_status(ep);
dev_vdbg(dev->dev, "%s set halt\n", ep->ep.name);
goto next_endpoints;
}
case USB_REQ_SET_ADDRESS: {
net2272_write(dev, OURADDR, u.r.wValue & 0xff);
allow_status(ep);
break;
}
default:
delegate:
dev_vdbg(dev->dev, "setup %02x.%02x v%04x i%04x "
"ep_cfg %08x\n",
u.r.bRequestType, u.r.bRequest,
u.r.wValue, u.r.wIndex,
net2272_ep_read(ep, EP_CFG));
spin_unlock(&dev->lock);
tmp = dev->driver->setup(&dev->gadget, &u.r);
spin_lock(&dev->lock);
}
/* stall ep0 on error */
if (tmp < 0) {
do_stall:
dev_vdbg(dev->dev, "req %02x.%02x protocol STALL; stat %d\n",
u.r.bRequestType, u.r.bRequest, tmp);
dev->protocol_stall = 1;
}
/* endpoint dma irq? */
} else if (stat & (1 << DMA_DONE_INTERRUPT)) {
net2272_cancel_dma(dev);
net2272_write(dev, IRQSTAT0, 1 << DMA_DONE_INTERRUPT);
stat &= ~(1 << DMA_DONE_INTERRUPT);
num = (net2272_read(dev, DMAREQ) & (1 << DMA_ENDPOINT_SELECT))
? 2 : 1;
ep = &dev->ep[num];
net2272_handle_dma(ep);
}
next_endpoints:
/* endpoint data irq? */
scratch = stat & 0x0f;
stat &= ~0x0f;
for (num = 0; scratch; num++) {
u8 t;
/* does this endpoint's FIFO and queue need tending? */
t = 1 << num;
if ((scratch & t) == 0)
continue;
scratch ^= t;
ep = &dev->ep[num];
net2272_handle_ep(ep);
}
/* some interrupts we can just ignore */
stat &= ~(1 << SOF_INTERRUPT);
if (stat)
dev_dbg(dev->dev, "unhandled irqstat0 %02x\n", stat);
}
static void
net2272_handle_stat1_irqs(struct net2272 *dev, u8 stat)
{
u8 tmp, mask;
/* after disconnect there's nothing else to do! */
tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
mask = (1 << USB_HIGH_SPEED) | (1 << USB_FULL_SPEED);
if (stat & tmp) {
bool reset = false;
bool disconnect = false;
/*
* Ignore disconnects and resets if the speed hasn't been set.
* VBUS can bounce and there's always an initial reset.
*/
net2272_write(dev, IRQSTAT1, tmp);
if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
if ((stat & (1 << VBUS_INTERRUPT)) &&
(net2272_read(dev, USBCTL1) &
(1 << VBUS_PIN)) == 0) {
disconnect = true;
dev_dbg(dev->dev, "disconnect %s\n",
dev->driver->driver.name);
} else if ((stat & (1 << ROOT_PORT_RESET_INTERRUPT)) &&
(net2272_read(dev, USBCTL1) & mask)
== 0) {
reset = true;
dev_dbg(dev->dev, "reset %s\n",
dev->driver->driver.name);
}
if (disconnect || reset) {
stop_activity(dev, dev->driver);
net2272_ep0_start(dev);
spin_unlock(&dev->lock);
if (reset)
usb_gadget_udc_reset
(&dev->gadget, dev->driver);
else
(dev->driver->disconnect)
(&dev->gadget);
spin_lock(&dev->lock);
return;
}
}
stat &= ~tmp;
if (!stat)
return;
}
tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
if (stat & tmp) {
net2272_write(dev, IRQSTAT1, tmp);
if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) {
if (dev->driver->suspend)
dev->driver->suspend(&dev->gadget);
if (!enable_suspend) {
stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
dev_dbg(dev->dev, "Suspend disabled, ignoring\n");
}
} else {
if (dev->driver->resume)
dev->driver->resume(&dev->gadget);
}
stat &= ~tmp;
}
/* clear any other status/irqs */
if (stat)
net2272_write(dev, IRQSTAT1, stat);
/* some status we can just ignore */
stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
| (1 << SUSPEND_REQUEST_INTERRUPT)
| (1 << RESUME_INTERRUPT));
if (!stat)
return;
else
dev_dbg(dev->dev, "unhandled irqstat1 %02x\n", stat);
}
static irqreturn_t net2272_irq(int irq, void *_dev)
{
struct net2272 *dev = _dev;
#if defined(PLX_PCI_RDK) || defined(PLX_PCI_RDK2)
u32 intcsr;
#endif
#if defined(PLX_PCI_RDK)
u8 dmareq;
#endif
spin_lock(&dev->lock);
#if defined(PLX_PCI_RDK)
intcsr = readl(dev->rdk1.plx9054_base_addr + INTCSR);
if ((intcsr & LOCAL_INTERRUPT_TEST) == LOCAL_INTERRUPT_TEST) {
writel(intcsr & ~(1 << PCI_INTERRUPT_ENABLE),
dev->rdk1.plx9054_base_addr + INTCSR);
net2272_handle_stat1_irqs(dev, net2272_read(dev, IRQSTAT1));
net2272_handle_stat0_irqs(dev, net2272_read(dev, IRQSTAT0));
intcsr = readl(dev->rdk1.plx9054_base_addr + INTCSR);
writel(intcsr | (1 << PCI_INTERRUPT_ENABLE),
dev->rdk1.plx9054_base_addr + INTCSR);
}
if ((intcsr & DMA_CHANNEL_0_TEST) == DMA_CHANNEL_0_TEST) {
writeb((1 << CHANNEL_CLEAR_INTERRUPT | (0 << CHANNEL_ENABLE)),
dev->rdk1.plx9054_base_addr + DMACSR0);
dmareq = net2272_read(dev, DMAREQ);
if (dmareq & 0x01)
net2272_handle_dma(&dev->ep[2]);
else
net2272_handle_dma(&dev->ep[1]);
}
#endif
#if defined(PLX_PCI_RDK2)
/* see if PCI int for us by checking irqstat */
intcsr = readl(dev->rdk2.fpga_base_addr + RDK2_IRQSTAT);
if (!(intcsr & (1 << NET2272_PCI_IRQ))) {
spin_unlock(&dev->lock);
return IRQ_NONE;
}
/* check dma interrupts */
#endif
/* Platform/devcice interrupt handler */
#if !defined(PLX_PCI_RDK)
net2272_handle_stat1_irqs(dev, net2272_read(dev, IRQSTAT1));
net2272_handle_stat0_irqs(dev, net2272_read(dev, IRQSTAT0));
#endif
spin_unlock(&dev->lock);
return IRQ_HANDLED;
}
static int net2272_present(struct net2272 *dev)
{
/*
* Quick test to see if CPU can communicate properly with the NET2272.
* Verifies connection using writes and reads to write/read and
* read-only registers.
*
* This routine is strongly recommended especially during early bring-up
* of new hardware, however for designs that do not apply Power On System
* Tests (POST) it may discarded (or perhaps minimized).
*/
unsigned int ii;
u8 val, refval;
/* Verify NET2272 write/read SCRATCH register can write and read */
refval = net2272_read(dev, SCRATCH);
for (ii = 0; ii < 0x100; ii += 7) {
net2272_write(dev, SCRATCH, ii);
val = net2272_read(dev, SCRATCH);
if (val != ii) {
dev_dbg(dev->dev,
"%s: write/read SCRATCH register test failed: "
"wrote:0x%2.2x, read:0x%2.2x\n",
__func__, ii, val);
return -EINVAL;
}
}
/* To be nice, we write the original SCRATCH value back: */
net2272_write(dev, SCRATCH, refval);
/* Verify NET2272 CHIPREV register is read-only: */
refval = net2272_read(dev, CHIPREV_2272);
for (ii = 0; ii < 0x100; ii += 7) {
net2272_write(dev, CHIPREV_2272, ii);
val = net2272_read(dev, CHIPREV_2272);
if (val != refval) {
dev_dbg(dev->dev,
"%s: write/read CHIPREV register test failed: "
"wrote 0x%2.2x, read:0x%2.2x expected:0x%2.2x\n",
__func__, ii, val, refval);
return -EINVAL;
}
}
/*
* Verify NET2272's "NET2270 legacy revision" register
* - NET2272 has two revision registers. The NET2270 legacy revision
* register should read the same value, regardless of the NET2272
* silicon revision. The legacy register applies to NET2270
* firmware being applied to the NET2272.
*/
val = net2272_read(dev, CHIPREV_LEGACY);
if (val != NET2270_LEGACY_REV) {
/*
* Unexpected legacy revision value
* - Perhaps the chip is a NET2270?
*/
dev_dbg(dev->dev,
"%s: WARNING: UNEXPECTED NET2272 LEGACY REGISTER VALUE:\n"
" - CHIPREV_LEGACY: expected 0x%2.2x, got:0x%2.2x. (Not NET2272?)\n",
__func__, NET2270_LEGACY_REV, val);
return -EINVAL;
}
/*
* Verify NET2272 silicon revision
* - This revision register is appropriate for the silicon version
* of the NET2272
*/
val = net2272_read(dev, CHIPREV_2272);
switch (val) {
case CHIPREV_NET2272_R1:
/*
* NET2272 Rev 1 has DMA related errata:
* - Newer silicon (Rev 1A or better) required
*/
dev_dbg(dev->dev,
"%s: Rev 1 detected: newer silicon recommended for DMA support\n",
__func__);
break;
case CHIPREV_NET2272_R1A:
break;
default:
/* NET2272 silicon version *may* not work with this firmware */
dev_dbg(dev->dev,
"%s: unexpected silicon revision register value: "
" CHIPREV_2272: 0x%2.2x\n",
__func__, val);
/*
* Return Success, even though the chip rev is not an expected value
* - Older, pre-built firmware can attempt to operate on newer silicon
* - Often, new silicon is perfectly compatible
*/
}
/* Success: NET2272 checks out OK */
return 0;
}
static void
net2272_gadget_release(struct device *_dev)
{
struct net2272 *dev = dev_get_drvdata(_dev);
kfree(dev);
}
/*---------------------------------------------------------------------------*/
static void
net2272_remove(struct net2272 *dev)
{
usb_del_gadget_udc(&dev->gadget);
free_irq(dev->irq, dev);
iounmap(dev->base_addr);
device_remove_file(dev->dev, &dev_attr_registers);
dev_info(dev->dev, "unbind\n");
}
static struct net2272 *net2272_probe_init(struct device *dev, unsigned int irq)
{
struct net2272 *ret;
if (!irq) {
dev_dbg(dev, "No IRQ!\n");
return ERR_PTR(-ENODEV);
}
/* alloc, and start init */
ret = kzalloc(sizeof(*ret), GFP_KERNEL);
if (!ret)
return ERR_PTR(-ENOMEM);
spin_lock_init(&ret->lock);
ret->irq = irq;
ret->dev = dev;
ret->gadget.ops = &net2272_ops;
ret->gadget.max_speed = USB_SPEED_HIGH;
/* the "gadget" abstracts/virtualizes the controller */
ret->gadget.name = driver_name;
return ret;
}
static int
net2272_probe_fin(struct net2272 *dev, unsigned int irqflags)
{
int ret;
/* See if there... */
if (net2272_present(dev)) {
dev_warn(dev->dev, "2272 not found!\n");
ret = -ENODEV;
goto err;
}
net2272_usb_reset(dev);
net2272_usb_reinit(dev);
ret = request_irq(dev->irq, net2272_irq, irqflags, driver_name, dev);
if (ret) {
dev_err(dev->dev, "request interrupt %i failed\n", dev->irq);
goto err;
}
dev->chiprev = net2272_read(dev, CHIPREV_2272);
/* done */
dev_info(dev->dev, "%s\n", driver_desc);
dev_info(dev->dev, "irq %i, mem %p, chip rev %04x, dma %s\n",
dev->irq, dev->base_addr, dev->chiprev,
dma_mode_string());
dev_info(dev->dev, "version: %s\n", driver_vers);
ret = device_create_file(dev->dev, &dev_attr_registers);
if (ret)
goto err_irq;
ret = usb_add_gadget_udc_release(dev->dev, &dev->gadget,
net2272_gadget_release);
if (ret)
goto err_add_udc;
return 0;
err_add_udc:
device_remove_file(dev->dev, &dev_attr_registers);
err_irq:
free_irq(dev->irq, dev);
err:
return ret;
}
#ifdef CONFIG_USB_PCI
/*
* wrap this driver around the specified device, but
* don't respond over USB until a gadget driver binds to us
*/
static int
net2272_rdk1_probe(struct pci_dev *pdev, struct net2272 *dev)
{
unsigned long resource, len, tmp;
void __iomem *mem_mapped_addr[4];
int ret, i;
/*
* BAR 0 holds PLX 9054 config registers
* BAR 1 is i/o memory; unused here
* BAR 2 holds EPLD config registers
* BAR 3 holds NET2272 registers
*/
/* Find and map all address spaces */
for (i = 0; i < 4; ++i) {
if (i == 1)
continue; /* BAR1 unused */
resource = pci_resource_start(pdev, i);
len = pci_resource_len(pdev, i);
if (!request_mem_region(resource, len, driver_name)) {
dev_dbg(dev->dev, "controller already in use\n");
ret = -EBUSY;
goto err;
}
mem_mapped_addr[i] = ioremap_nocache(resource, len);
if (mem_mapped_addr[i] == NULL) {
release_mem_region(resource, len);
dev_dbg(dev->dev, "can't map memory\n");
ret = -EFAULT;
goto err;
}
}
dev->rdk1.plx9054_base_addr = mem_mapped_addr[0];
dev->rdk1.epld_base_addr = mem_mapped_addr[2];
dev->base_addr = mem_mapped_addr[3];
/* Set PLX 9054 bus width (16 bits) */
tmp = readl(dev->rdk1.plx9054_base_addr + LBRD1);
writel((tmp & ~(3 << MEMORY_SPACE_LOCAL_BUS_WIDTH)) | W16_BIT,
dev->rdk1.plx9054_base_addr + LBRD1);
/* Enable PLX 9054 Interrupts */
writel(readl(dev->rdk1.plx9054_base_addr + INTCSR) |
(1 << PCI_INTERRUPT_ENABLE) |
(1 << LOCAL_INTERRUPT_INPUT_ENABLE),
dev->rdk1.plx9054_base_addr + INTCSR);
writeb((1 << CHANNEL_CLEAR_INTERRUPT | (0 << CHANNEL_ENABLE)),
dev->rdk1.plx9054_base_addr + DMACSR0);
/* reset */
writeb((1 << EPLD_DMA_ENABLE) |
(1 << DMA_CTL_DACK) |
(1 << DMA_TIMEOUT_ENABLE) |
(1 << USER) |
(0 << MPX_MODE) |
(1 << BUSWIDTH) |
(1 << NET2272_RESET),
dev->base_addr + EPLD_IO_CONTROL_REGISTER);
mb();
writeb(readb(dev->base_addr + EPLD_IO_CONTROL_REGISTER) &
~(1 << NET2272_RESET),
dev->base_addr + EPLD_IO_CONTROL_REGISTER);
udelay(200);
return 0;
err:
while (--i >= 0) {
iounmap(mem_mapped_addr[i]);
release_mem_region(pci_resource_start(pdev, i),
pci_resource_len(pdev, i));
}
return ret;
}
static int
net2272_rdk2_probe(struct pci_dev *pdev, struct net2272 *dev)
{
unsigned long resource, len;
void __iomem *mem_mapped_addr[2];
int ret, i;
/*
* BAR 0 holds FGPA config registers
* BAR 1 holds NET2272 registers
*/
/* Find and map all address spaces, bar2-3 unused in rdk 2 */
for (i = 0; i < 2; ++i) {
resource = pci_resource_start(pdev, i);
len = pci_resource_len(pdev, i);
if (!request_mem_region(resource, len, driver_name)) {
dev_dbg(dev->dev, "controller already in use\n");
ret = -EBUSY;
goto err;
}
mem_mapped_addr[i] = ioremap_nocache(resource, len);
if (mem_mapped_addr[i] == NULL) {
release_mem_region(resource, len);
dev_dbg(dev->dev, "can't map memory\n");
ret = -EFAULT;
goto err;
}
}
dev->rdk2.fpga_base_addr = mem_mapped_addr[0];
dev->base_addr = mem_mapped_addr[1];
mb();
/* Set 2272 bus width (16 bits) and reset */
writel((1 << CHIP_RESET), dev->rdk2.fpga_base_addr + RDK2_LOCCTLRDK);
udelay(200);
writel((1 << BUS_WIDTH), dev->rdk2.fpga_base_addr + RDK2_LOCCTLRDK);
/* Print fpga version number */
dev_info(dev->dev, "RDK2 FPGA version %08x\n",
readl(dev->rdk2.fpga_base_addr + RDK2_FPGAREV));
/* Enable FPGA Interrupts */
writel((1 << NET2272_PCI_IRQ), dev->rdk2.fpga_base_addr + RDK2_IRQENB);
return 0;
err:
while (--i >= 0) {
iounmap(mem_mapped_addr[i]);
release_mem_region(pci_resource_start(pdev, i),
pci_resource_len(pdev, i));
}
return ret;
}
static int
net2272_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct net2272 *dev;
int ret;
dev = net2272_probe_init(&pdev->dev, pdev->irq);
if (IS_ERR(dev))
return PTR_ERR(dev);
dev->dev_id = pdev->device;
if (pci_enable_device(pdev) < 0) {
ret = -ENODEV;
goto err_free;
}
pci_set_master(pdev);
switch (pdev->device) {
case PCI_DEVICE_ID_RDK1: ret = net2272_rdk1_probe(pdev, dev); break;
case PCI_DEVICE_ID_RDK2: ret = net2272_rdk2_probe(pdev, dev); break;
default: BUG();
}
if (ret)
goto err_pci;
ret = net2272_probe_fin(dev, 0);
if (ret)
goto err_pci;
pci_set_drvdata(pdev, dev);
return 0;
err_pci:
pci_disable_device(pdev);
err_free:
kfree(dev);
return ret;
}
static void
net2272_rdk1_remove(struct pci_dev *pdev, struct net2272 *dev)
{
int i;
/* disable PLX 9054 interrupts */
writel(readl(dev->rdk1.plx9054_base_addr + INTCSR) &
~(1 << PCI_INTERRUPT_ENABLE),
dev->rdk1.plx9054_base_addr + INTCSR);
/* clean up resources allocated during probe() */
iounmap(dev->rdk1.plx9054_base_addr);
iounmap(dev->rdk1.epld_base_addr);
for (i = 0; i < 4; ++i) {
if (i == 1)
continue; /* BAR1 unused */
release_mem_region(pci_resource_start(pdev, i),
pci_resource_len(pdev, i));
}
}
static void
net2272_rdk2_remove(struct pci_dev *pdev, struct net2272 *dev)
{
int i;
/* disable fpga interrupts
writel(readl(dev->rdk1.plx9054_base_addr + INTCSR) &
~(1 << PCI_INTERRUPT_ENABLE),
dev->rdk1.plx9054_base_addr + INTCSR);
*/
/* clean up resources allocated during probe() */
iounmap(dev->rdk2.fpga_base_addr);
for (i = 0; i < 2; ++i)
release_mem_region(pci_resource_start(pdev, i),
pci_resource_len(pdev, i));
}
static void
net2272_pci_remove(struct pci_dev *pdev)
{
struct net2272 *dev = pci_get_drvdata(pdev);
net2272_remove(dev);
switch (pdev->device) {
case PCI_DEVICE_ID_RDK1: net2272_rdk1_remove(pdev, dev); break;
case PCI_DEVICE_ID_RDK2: net2272_rdk2_remove(pdev, dev); break;
default: BUG();
}
pci_disable_device(pdev);
kfree(dev);
}
/* Table of matching PCI IDs */
static struct pci_device_id pci_ids[] = {
{ /* RDK 1 card */
.class = ((PCI_CLASS_BRIDGE_OTHER << 8) | 0xfe),
.class_mask = 0,
.vendor = PCI_VENDOR_ID_PLX,
.device = PCI_DEVICE_ID_RDK1,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{ /* RDK 2 card */
.class = ((PCI_CLASS_BRIDGE_OTHER << 8) | 0xfe),
.class_mask = 0,
.vendor = PCI_VENDOR_ID_PLX,
.device = PCI_DEVICE_ID_RDK2,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{ }
};
MODULE_DEVICE_TABLE(pci, pci_ids);
static struct pci_driver net2272_pci_driver = {
.name = driver_name,
.id_table = pci_ids,
.probe = net2272_pci_probe,
.remove = net2272_pci_remove,
};
static int net2272_pci_register(void)
{
return pci_register_driver(&net2272_pci_driver);
}
static void net2272_pci_unregister(void)
{
pci_unregister_driver(&net2272_pci_driver);
}
#else
static inline int net2272_pci_register(void) { return 0; }
static inline void net2272_pci_unregister(void) { }
#endif
/*---------------------------------------------------------------------------*/
static int
net2272_plat_probe(struct platform_device *pdev)
{
struct net2272 *dev;
int ret;
unsigned int irqflags;
resource_size_t base, len;
struct resource *iomem, *iomem_bus, *irq_res;
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
iomem_bus = platform_get_resource(pdev, IORESOURCE_BUS, 0);
if (!irq_res || !iomem) {
dev_err(&pdev->dev, "must provide irq/base addr");
return -EINVAL;
}
dev = net2272_probe_init(&pdev->dev, irq_res->start);
if (IS_ERR(dev))
return PTR_ERR(dev);
irqflags = 0;
if (irq_res->flags & IORESOURCE_IRQ_HIGHEDGE)
irqflags |= IRQF_TRIGGER_RISING;
if (irq_res->flags & IORESOURCE_IRQ_LOWEDGE)
irqflags |= IRQF_TRIGGER_FALLING;
if (irq_res->flags & IORESOURCE_IRQ_HIGHLEVEL)
irqflags |= IRQF_TRIGGER_HIGH;
if (irq_res->flags & IORESOURCE_IRQ_LOWLEVEL)
irqflags |= IRQF_TRIGGER_LOW;
base = iomem->start;
len = resource_size(iomem);
if (iomem_bus)
dev->base_shift = iomem_bus->start;
if (!request_mem_region(base, len, driver_name)) {
dev_dbg(dev->dev, "get request memory region!\n");
ret = -EBUSY;
goto err;
}
dev->base_addr = ioremap_nocache(base, len);
if (!dev->base_addr) {
dev_dbg(dev->dev, "can't map memory\n");
ret = -EFAULT;
goto err_req;
}
ret = net2272_probe_fin(dev, IRQF_TRIGGER_LOW);
if (ret)
goto err_io;
platform_set_drvdata(pdev, dev);
dev_info(&pdev->dev, "running in 16-bit, %sbyte swap local bus mode\n",
(net2272_read(dev, LOCCTL) & (1 << BYTE_SWAP)) ? "" : "no ");
return 0;
err_io:
iounmap(dev->base_addr);
err_req:
release_mem_region(base, len);
err:
return ret;
}
static int
net2272_plat_remove(struct platform_device *pdev)
{
struct net2272 *dev = platform_get_drvdata(pdev);
net2272_remove(dev);
release_mem_region(pdev->resource[0].start,
resource_size(&pdev->resource[0]));
kfree(dev);
return 0;
}
static struct platform_driver net2272_plat_driver = {
.probe = net2272_plat_probe,
.remove = net2272_plat_remove,
.driver = {
.name = driver_name,
},
/* FIXME .suspend, .resume */
};
MODULE_ALIAS("platform:net2272");
static int __init net2272_init(void)
{
int ret;
ret = net2272_pci_register();
if (ret)
return ret;
ret = platform_driver_register(&net2272_plat_driver);
if (ret)
goto err_pci;
return ret;
err_pci:
net2272_pci_unregister();
return ret;
}
module_init(net2272_init);
static void __exit net2272_cleanup(void)
{
net2272_pci_unregister();
platform_driver_unregister(&net2272_plat_driver);
}
module_exit(net2272_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("PLX Technology, Inc.");
MODULE_LICENSE("GPL");
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