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linux/drivers/dma/imx-dma.c
Uwe Kleine-König 14c49dd0c3 dmaengine: imx-dma: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new() which already returns void. Eventually after all drivers
are converted, .remove_new() is renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230919133207.1400430-19-u.kleine-koenig@pengutronix.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2023-09-28 13:10:49 +05:30

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// SPDX-License-Identifier: GPL-2.0+
//
// drivers/dma/imx-dma.c
//
// This file contains a driver for the Freescale i.MX DMA engine
// found on i.MX1/21/27
//
// Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
// Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <asm/irq.h>
#include <linux/dma/imx-dma.h>
#include "dmaengine.h"
#define IMXDMA_MAX_CHAN_DESCRIPTORS 16
#define IMX_DMA_CHANNELS 16
#define IMX_DMA_2D_SLOTS 2
#define IMX_DMA_2D_SLOT_A 0
#define IMX_DMA_2D_SLOT_B 1
#define IMX_DMA_LENGTH_LOOP ((unsigned int)-1)
#define IMX_DMA_MEMSIZE_32 (0 << 4)
#define IMX_DMA_MEMSIZE_8 (1 << 4)
#define IMX_DMA_MEMSIZE_16 (2 << 4)
#define IMX_DMA_TYPE_LINEAR (0 << 10)
#define IMX_DMA_TYPE_2D (1 << 10)
#define IMX_DMA_TYPE_FIFO (2 << 10)
#define IMX_DMA_ERR_BURST (1 << 0)
#define IMX_DMA_ERR_REQUEST (1 << 1)
#define IMX_DMA_ERR_TRANSFER (1 << 2)
#define IMX_DMA_ERR_BUFFER (1 << 3)
#define IMX_DMA_ERR_TIMEOUT (1 << 4)
#define DMA_DCR 0x00 /* Control Register */
#define DMA_DISR 0x04 /* Interrupt status Register */
#define DMA_DIMR 0x08 /* Interrupt mask Register */
#define DMA_DBTOSR 0x0c /* Burst timeout status Register */
#define DMA_DRTOSR 0x10 /* Request timeout Register */
#define DMA_DSESR 0x14 /* Transfer Error Status Register */
#define DMA_DBOSR 0x18 /* Buffer overflow status Register */
#define DMA_DBTOCR 0x1c /* Burst timeout control Register */
#define DMA_WSRA 0x40 /* W-Size Register A */
#define DMA_XSRA 0x44 /* X-Size Register A */
#define DMA_YSRA 0x48 /* Y-Size Register A */
#define DMA_WSRB 0x4c /* W-Size Register B */
#define DMA_XSRB 0x50 /* X-Size Register B */
#define DMA_YSRB 0x54 /* Y-Size Register B */
#define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */
#define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */
#define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */
#define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */
#define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */
#define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */
#define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */
#define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */
#define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */
#define DCR_DRST (1<<1)
#define DCR_DEN (1<<0)
#define DBTOCR_EN (1<<15)
#define DBTOCR_CNT(x) ((x) & 0x7fff)
#define CNTR_CNT(x) ((x) & 0xffffff)
#define CCR_ACRPT (1<<14)
#define CCR_DMOD_LINEAR (0x0 << 12)
#define CCR_DMOD_2D (0x1 << 12)
#define CCR_DMOD_FIFO (0x2 << 12)
#define CCR_DMOD_EOBFIFO (0x3 << 12)
#define CCR_SMOD_LINEAR (0x0 << 10)
#define CCR_SMOD_2D (0x1 << 10)
#define CCR_SMOD_FIFO (0x2 << 10)
#define CCR_SMOD_EOBFIFO (0x3 << 10)
#define CCR_MDIR_DEC (1<<9)
#define CCR_MSEL_B (1<<8)
#define CCR_DSIZ_32 (0x0 << 6)
#define CCR_DSIZ_8 (0x1 << 6)
#define CCR_DSIZ_16 (0x2 << 6)
#define CCR_SSIZ_32 (0x0 << 4)
#define CCR_SSIZ_8 (0x1 << 4)
#define CCR_SSIZ_16 (0x2 << 4)
#define CCR_REN (1<<3)
#define CCR_RPT (1<<2)
#define CCR_FRC (1<<1)
#define CCR_CEN (1<<0)
#define RTOR_EN (1<<15)
#define RTOR_CLK (1<<14)
#define RTOR_PSC (1<<13)
enum imxdma_prep_type {
IMXDMA_DESC_MEMCPY,
IMXDMA_DESC_INTERLEAVED,
IMXDMA_DESC_SLAVE_SG,
IMXDMA_DESC_CYCLIC,
};
struct imx_dma_2d_config {
u16 xsr;
u16 ysr;
u16 wsr;
int count;
};
struct imxdma_desc {
struct list_head node;
struct dma_async_tx_descriptor desc;
enum dma_status status;
dma_addr_t src;
dma_addr_t dest;
size_t len;
enum dma_transfer_direction direction;
enum imxdma_prep_type type;
/* For memcpy and interleaved */
unsigned int config_port;
unsigned int config_mem;
/* For interleaved transfers */
unsigned int x;
unsigned int y;
unsigned int w;
/* For slave sg and cyclic */
struct scatterlist *sg;
unsigned int sgcount;
};
struct imxdma_channel {
int hw_chaining;
struct timer_list watchdog;
struct imxdma_engine *imxdma;
unsigned int channel;
struct tasklet_struct dma_tasklet;
struct list_head ld_free;
struct list_head ld_queue;
struct list_head ld_active;
int descs_allocated;
enum dma_slave_buswidth word_size;
dma_addr_t per_address;
u32 watermark_level;
struct dma_chan chan;
struct dma_async_tx_descriptor desc;
enum dma_status status;
int dma_request;
struct scatterlist *sg_list;
u32 ccr_from_device;
u32 ccr_to_device;
bool enabled_2d;
int slot_2d;
unsigned int irq;
struct dma_slave_config config;
};
enum imx_dma_type {
IMX1_DMA,
IMX21_DMA,
IMX27_DMA,
};
struct imxdma_engine {
struct device *dev;
struct dma_device dma_device;
void __iomem *base;
struct clk *dma_ahb;
struct clk *dma_ipg;
spinlock_t lock;
struct imx_dma_2d_config slots_2d[IMX_DMA_2D_SLOTS];
struct imxdma_channel channel[IMX_DMA_CHANNELS];
enum imx_dma_type devtype;
unsigned int irq;
unsigned int irq_err;
};
struct imxdma_filter_data {
struct imxdma_engine *imxdma;
int request;
};
static const struct of_device_id imx_dma_of_dev_id[] = {
{
.compatible = "fsl,imx1-dma", .data = (const void *)IMX1_DMA,
}, {
.compatible = "fsl,imx21-dma", .data = (const void *)IMX21_DMA,
}, {
.compatible = "fsl,imx27-dma", .data = (const void *)IMX27_DMA,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id);
static inline int is_imx1_dma(struct imxdma_engine *imxdma)
{
return imxdma->devtype == IMX1_DMA;
}
static inline int is_imx27_dma(struct imxdma_engine *imxdma)
{
return imxdma->devtype == IMX27_DMA;
}
static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
{
return container_of(chan, struct imxdma_channel, chan);
}
static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac)
{
struct imxdma_desc *desc;
if (!list_empty(&imxdmac->ld_active)) {
desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc,
node);
if (desc->type == IMXDMA_DESC_CYCLIC)
return true;
}
return false;
}
static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val,
unsigned offset)
{
__raw_writel(val, imxdma->base + offset);
}
static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset)
{
return __raw_readl(imxdma->base + offset);
}
static int imxdma_hw_chain(struct imxdma_channel *imxdmac)
{
struct imxdma_engine *imxdma = imxdmac->imxdma;
if (is_imx27_dma(imxdma))
return imxdmac->hw_chaining;
else
return 0;
}
/*
* imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
*/
static inline void imxdma_sg_next(struct imxdma_desc *d)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct scatterlist *sg = d->sg;
size_t now;
now = min_t(size_t, d->len, sg_dma_len(sg));
if (d->len != IMX_DMA_LENGTH_LOOP)
d->len -= now;
if (d->direction == DMA_DEV_TO_MEM)
imx_dmav1_writel(imxdma, sg->dma_address,
DMA_DAR(imxdmac->channel));
else
imx_dmav1_writel(imxdma, sg->dma_address,
DMA_SAR(imxdmac->channel));
imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel));
dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, "
"size 0x%08x\n", __func__, imxdmac->channel,
imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)),
imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)),
imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel)));
}
static void imxdma_enable_hw(struct imxdma_desc *d)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
int channel = imxdmac->channel;
unsigned long flags;
dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
local_irq_save(flags);
imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) &
~(1 << channel), DMA_DIMR);
imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) |
CCR_CEN | CCR_ACRPT, DMA_CCR(channel));
if (!is_imx1_dma(imxdma) &&
d->sg && imxdma_hw_chain(imxdmac)) {
d->sg = sg_next(d->sg);
if (d->sg) {
u32 tmp;
imxdma_sg_next(d);
tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel));
imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT,
DMA_CCR(channel));
}
}
local_irq_restore(flags);
}
static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
{
struct imxdma_engine *imxdma = imxdmac->imxdma;
int channel = imxdmac->channel;
unsigned long flags;
dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
if (imxdma_hw_chain(imxdmac))
del_timer(&imxdmac->watchdog);
local_irq_save(flags);
imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) |
(1 << channel), DMA_DIMR);
imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) &
~CCR_CEN, DMA_CCR(channel));
imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
local_irq_restore(flags);
}
static void imxdma_watchdog(struct timer_list *t)
{
struct imxdma_channel *imxdmac = from_timer(imxdmac, t, watchdog);
struct imxdma_engine *imxdma = imxdmac->imxdma;
int channel = imxdmac->channel;
imx_dmav1_writel(imxdma, 0, DMA_CCR(channel));
/* Tasklet watchdog error handler */
tasklet_schedule(&imxdmac->dma_tasklet);
dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n",
imxdmac->channel);
}
static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
{
struct imxdma_engine *imxdma = dev_id;
unsigned int err_mask;
int i, disr;
int errcode;
disr = imx_dmav1_readl(imxdma, DMA_DISR);
err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) |
imx_dmav1_readl(imxdma, DMA_DRTOSR) |
imx_dmav1_readl(imxdma, DMA_DSESR) |
imx_dmav1_readl(imxdma, DMA_DBOSR);
if (!err_mask)
return IRQ_HANDLED;
imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR);
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
if (!(err_mask & (1 << i)))
continue;
errcode = 0;
if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) {
imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR);
errcode |= IMX_DMA_ERR_BURST;
}
if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) {
imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR);
errcode |= IMX_DMA_ERR_REQUEST;
}
if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) {
imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR);
errcode |= IMX_DMA_ERR_TRANSFER;
}
if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) {
imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR);
errcode |= IMX_DMA_ERR_BUFFER;
}
/* Tasklet error handler */
tasklet_schedule(&imxdma->channel[i].dma_tasklet);
dev_warn(imxdma->dev,
"DMA timeout on channel %d -%s%s%s%s\n", i,
errcode & IMX_DMA_ERR_BURST ? " burst" : "",
errcode & IMX_DMA_ERR_REQUEST ? " request" : "",
errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
errcode & IMX_DMA_ERR_BUFFER ? " buffer" : "");
}
return IRQ_HANDLED;
}
static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
{
struct imxdma_engine *imxdma = imxdmac->imxdma;
int chno = imxdmac->channel;
struct imxdma_desc *desc;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
if (list_empty(&imxdmac->ld_active)) {
spin_unlock_irqrestore(&imxdma->lock, flags);
goto out;
}
desc = list_first_entry(&imxdmac->ld_active,
struct imxdma_desc,
node);
spin_unlock_irqrestore(&imxdma->lock, flags);
if (desc->sg) {
u32 tmp;
desc->sg = sg_next(desc->sg);
if (desc->sg) {
imxdma_sg_next(desc);
tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno));
if (imxdma_hw_chain(imxdmac)) {
/* FIXME: The timeout should probably be
* configurable
*/
mod_timer(&imxdmac->watchdog,
jiffies + msecs_to_jiffies(500));
tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
} else {
imx_dmav1_writel(imxdma, tmp & ~CCR_CEN,
DMA_CCR(chno));
tmp |= CCR_CEN;
}
imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
if (imxdma_chan_is_doing_cyclic(imxdmac))
/* Tasklet progression */
tasklet_schedule(&imxdmac->dma_tasklet);
return;
}
if (imxdma_hw_chain(imxdmac)) {
del_timer(&imxdmac->watchdog);
return;
}
}
out:
imx_dmav1_writel(imxdma, 0, DMA_CCR(chno));
/* Tasklet irq */
tasklet_schedule(&imxdmac->dma_tasklet);
}
static irqreturn_t dma_irq_handler(int irq, void *dev_id)
{
struct imxdma_engine *imxdma = dev_id;
int i, disr;
if (!is_imx1_dma(imxdma))
imxdma_err_handler(irq, dev_id);
disr = imx_dmav1_readl(imxdma, DMA_DISR);
dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr);
imx_dmav1_writel(imxdma, disr, DMA_DISR);
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
if (disr & (1 << i))
dma_irq_handle_channel(&imxdma->channel[i]);
}
return IRQ_HANDLED;
}
static int imxdma_xfer_desc(struct imxdma_desc *d)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
int slot = -1;
int i;
/* Configure and enable */
switch (d->type) {
case IMXDMA_DESC_INTERLEAVED:
/* Try to get a free 2D slot */
for (i = 0; i < IMX_DMA_2D_SLOTS; i++) {
if ((imxdma->slots_2d[i].count > 0) &&
((imxdma->slots_2d[i].xsr != d->x) ||
(imxdma->slots_2d[i].ysr != d->y) ||
(imxdma->slots_2d[i].wsr != d->w)))
continue;
slot = i;
break;
}
if (slot < 0)
return -EBUSY;
imxdma->slots_2d[slot].xsr = d->x;
imxdma->slots_2d[slot].ysr = d->y;
imxdma->slots_2d[slot].wsr = d->w;
imxdma->slots_2d[slot].count++;
imxdmac->slot_2d = slot;
imxdmac->enabled_2d = true;
if (slot == IMX_DMA_2D_SLOT_A) {
d->config_mem &= ~CCR_MSEL_B;
d->config_port &= ~CCR_MSEL_B;
imx_dmav1_writel(imxdma, d->x, DMA_XSRA);
imx_dmav1_writel(imxdma, d->y, DMA_YSRA);
imx_dmav1_writel(imxdma, d->w, DMA_WSRA);
} else {
d->config_mem |= CCR_MSEL_B;
d->config_port |= CCR_MSEL_B;
imx_dmav1_writel(imxdma, d->x, DMA_XSRB);
imx_dmav1_writel(imxdma, d->y, DMA_YSRB);
imx_dmav1_writel(imxdma, d->w, DMA_WSRB);
}
/*
* We fall-through here intentionally, since a 2D transfer is
* similar to MEMCPY just adding the 2D slot configuration.
*/
fallthrough;
case IMXDMA_DESC_MEMCPY:
imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel));
imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel));
imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2),
DMA_CCR(imxdmac->channel));
imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel));
dev_dbg(imxdma->dev,
"%s channel: %d dest=0x%08llx src=0x%08llx dma_length=%zu\n",
__func__, imxdmac->channel,
(unsigned long long)d->dest,
(unsigned long long)d->src, d->len);
break;
/* Cyclic transfer is the same as slave_sg with special sg configuration. */
case IMXDMA_DESC_CYCLIC:
case IMXDMA_DESC_SLAVE_SG:
if (d->direction == DMA_DEV_TO_MEM) {
imx_dmav1_writel(imxdma, imxdmac->per_address,
DMA_SAR(imxdmac->channel));
imx_dmav1_writel(imxdma, imxdmac->ccr_from_device,
DMA_CCR(imxdmac->channel));
dev_dbg(imxdma->dev,
"%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (dev2mem)\n",
__func__, imxdmac->channel,
d->sg, d->sgcount, d->len,
(unsigned long long)imxdmac->per_address);
} else if (d->direction == DMA_MEM_TO_DEV) {
imx_dmav1_writel(imxdma, imxdmac->per_address,
DMA_DAR(imxdmac->channel));
imx_dmav1_writel(imxdma, imxdmac->ccr_to_device,
DMA_CCR(imxdmac->channel));
dev_dbg(imxdma->dev,
"%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (mem2dev)\n",
__func__, imxdmac->channel,
d->sg, d->sgcount, d->len,
(unsigned long long)imxdmac->per_address);
} else {
dev_err(imxdma->dev, "%s channel: %d bad dma mode\n",
__func__, imxdmac->channel);
return -EINVAL;
}
imxdma_sg_next(d);
break;
default:
return -EINVAL;
}
imxdma_enable_hw(d);
return 0;
}
static void imxdma_tasklet(struct tasklet_struct *t)
{
struct imxdma_channel *imxdmac = from_tasklet(imxdmac, t, dma_tasklet);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc, *next_desc;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
if (list_empty(&imxdmac->ld_active)) {
/* Someone might have called terminate all */
spin_unlock_irqrestore(&imxdma->lock, flags);
return;
}
desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
/* If we are dealing with a cyclic descriptor, keep it on ld_active
* and dont mark the descriptor as complete.
* Only in non-cyclic cases it would be marked as complete
*/
if (imxdma_chan_is_doing_cyclic(imxdmac))
goto out;
else
dma_cookie_complete(&desc->desc);
/* Free 2D slot if it was an interleaved transfer */
if (imxdmac->enabled_2d) {
imxdma->slots_2d[imxdmac->slot_2d].count--;
imxdmac->enabled_2d = false;
}
list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free);
if (!list_empty(&imxdmac->ld_queue)) {
next_desc = list_first_entry(&imxdmac->ld_queue,
struct imxdma_desc, node);
list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active);
if (imxdma_xfer_desc(next_desc) < 0)
dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n",
__func__, imxdmac->channel);
}
out:
spin_unlock_irqrestore(&imxdma->lock, flags);
dmaengine_desc_get_callback_invoke(&desc->desc, NULL);
}
static int imxdma_terminate_all(struct dma_chan *chan)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
unsigned long flags;
imxdma_disable_hw(imxdmac);
spin_lock_irqsave(&imxdma->lock, flags);
list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
spin_unlock_irqrestore(&imxdma->lock, flags);
return 0;
}
static int imxdma_config_write(struct dma_chan *chan,
struct dma_slave_config *dmaengine_cfg,
enum dma_transfer_direction direction)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
unsigned int mode = 0;
if (direction == DMA_DEV_TO_MEM) {
imxdmac->per_address = dmaengine_cfg->src_addr;
imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
imxdmac->word_size = dmaengine_cfg->src_addr_width;
} else {
imxdmac->per_address = dmaengine_cfg->dst_addr;
imxdmac->watermark_level = dmaengine_cfg->dst_maxburst;
imxdmac->word_size = dmaengine_cfg->dst_addr_width;
}
switch (imxdmac->word_size) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
mode = IMX_DMA_MEMSIZE_8;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
mode = IMX_DMA_MEMSIZE_16;
break;
default:
case DMA_SLAVE_BUSWIDTH_4_BYTES:
mode = IMX_DMA_MEMSIZE_32;
break;
}
imxdmac->hw_chaining = 0;
imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) |
((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) |
CCR_REN;
imxdmac->ccr_to_device =
(IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) |
((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN;
imx_dmav1_writel(imxdma, imxdmac->dma_request,
DMA_RSSR(imxdmac->channel));
/* Set burst length */
imx_dmav1_writel(imxdma, imxdmac->watermark_level *
imxdmac->word_size, DMA_BLR(imxdmac->channel));
return 0;
}
static int imxdma_config(struct dma_chan *chan,
struct dma_slave_config *dmaengine_cfg)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
memcpy(&imxdmac->config, dmaengine_cfg, sizeof(*dmaengine_cfg));
return 0;
}
static enum dma_status imxdma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(chan, cookie, txstate);
}
static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
dma_cookie_t cookie;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue);
cookie = dma_cookie_assign(tx);
spin_unlock_irqrestore(&imxdma->lock, flags);
return cookie;
}
static int imxdma_alloc_chan_resources(struct dma_chan *chan)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imx_dma_data *data = chan->private;
if (data != NULL)
imxdmac->dma_request = data->dma_request;
while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) {
struct imxdma_desc *desc;
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
break;
dma_async_tx_descriptor_init(&desc->desc, chan);
desc->desc.tx_submit = imxdma_tx_submit;
/* txd.flags will be overwritten in prep funcs */
desc->desc.flags = DMA_CTRL_ACK;
desc->status = DMA_COMPLETE;
list_add_tail(&desc->node, &imxdmac->ld_free);
imxdmac->descs_allocated++;
}
if (!imxdmac->descs_allocated)
return -ENOMEM;
return imxdmac->descs_allocated;
}
static void imxdma_free_chan_resources(struct dma_chan *chan)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc, *_desc;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
imxdma_disable_hw(imxdmac);
list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
spin_unlock_irqrestore(&imxdma->lock, flags);
list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) {
kfree(desc);
imxdmac->descs_allocated--;
}
INIT_LIST_HEAD(&imxdmac->ld_free);
kfree(imxdmac->sg_list);
imxdmac->sg_list = NULL;
}
static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct scatterlist *sg;
int i, dma_length = 0;
struct imxdma_desc *desc;
if (list_empty(&imxdmac->ld_free) ||
imxdma_chan_is_doing_cyclic(imxdmac))
return NULL;
desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
for_each_sg(sgl, sg, sg_len, i) {
dma_length += sg_dma_len(sg);
}
imxdma_config_write(chan, &imxdmac->config, direction);
switch (imxdmac->word_size) {
case DMA_SLAVE_BUSWIDTH_4_BYTES:
if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_1_BYTE:
break;
default:
return NULL;
}
desc->type = IMXDMA_DESC_SLAVE_SG;
desc->sg = sgl;
desc->sgcount = sg_len;
desc->len = dma_length;
desc->direction = direction;
if (direction == DMA_DEV_TO_MEM) {
desc->src = imxdmac->per_address;
} else {
desc->dest = imxdmac->per_address;
}
desc->desc.callback = NULL;
desc->desc.callback_param = NULL;
return &desc->desc;
}
static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc;
int i;
unsigned int periods = buf_len / period_len;
dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n",
__func__, imxdmac->channel, buf_len, period_len);
if (list_empty(&imxdmac->ld_free) ||
imxdma_chan_is_doing_cyclic(imxdmac))
return NULL;
desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
kfree(imxdmac->sg_list);
imxdmac->sg_list = kcalloc(periods + 1,
sizeof(struct scatterlist), GFP_ATOMIC);
if (!imxdmac->sg_list)
return NULL;
sg_init_table(imxdmac->sg_list, periods);
for (i = 0; i < periods; i++) {
sg_assign_page(&imxdmac->sg_list[i], NULL);
imxdmac->sg_list[i].offset = 0;
imxdmac->sg_list[i].dma_address = dma_addr;
sg_dma_len(&imxdmac->sg_list[i]) = period_len;
dma_addr += period_len;
}
/* close the loop */
sg_chain(imxdmac->sg_list, periods + 1, imxdmac->sg_list);
desc->type = IMXDMA_DESC_CYCLIC;
desc->sg = imxdmac->sg_list;
desc->sgcount = periods;
desc->len = IMX_DMA_LENGTH_LOOP;
desc->direction = direction;
if (direction == DMA_DEV_TO_MEM) {
desc->src = imxdmac->per_address;
} else {
desc->dest = imxdmac->per_address;
}
desc->desc.callback = NULL;
desc->desc.callback_param = NULL;
imxdma_config_write(chan, &imxdmac->config, direction);
return &desc->desc;
}
static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest,
dma_addr_t src, size_t len, unsigned long flags)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc;
dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n",
__func__, imxdmac->channel, (unsigned long long)src,
(unsigned long long)dest, len);
if (list_empty(&imxdmac->ld_free) ||
imxdma_chan_is_doing_cyclic(imxdmac))
return NULL;
desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
desc->type = IMXDMA_DESC_MEMCPY;
desc->src = src;
desc->dest = dest;
desc->len = len;
desc->direction = DMA_MEM_TO_MEM;
desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
desc->desc.callback = NULL;
desc->desc.callback_param = NULL;
return &desc->desc;
}
static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved(
struct dma_chan *chan, struct dma_interleaved_template *xt,
unsigned long flags)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc;
dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n"
" src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__,
imxdmac->channel, (unsigned long long)xt->src_start,
(unsigned long long) xt->dst_start,
xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false",
xt->numf, xt->frame_size);
if (list_empty(&imxdmac->ld_free) ||
imxdma_chan_is_doing_cyclic(imxdmac))
return NULL;
if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM)
return NULL;
desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
desc->type = IMXDMA_DESC_INTERLEAVED;
desc->src = xt->src_start;
desc->dest = xt->dst_start;
desc->x = xt->sgl[0].size;
desc->y = xt->numf;
desc->w = xt->sgl[0].icg + desc->x;
desc->len = desc->x * desc->y;
desc->direction = DMA_MEM_TO_MEM;
desc->config_port = IMX_DMA_MEMSIZE_32;
desc->config_mem = IMX_DMA_MEMSIZE_32;
if (xt->src_sgl)
desc->config_mem |= IMX_DMA_TYPE_2D;
if (xt->dst_sgl)
desc->config_port |= IMX_DMA_TYPE_2D;
desc->desc.callback = NULL;
desc->desc.callback_param = NULL;
return &desc->desc;
}
static void imxdma_issue_pending(struct dma_chan *chan)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
if (list_empty(&imxdmac->ld_active) &&
!list_empty(&imxdmac->ld_queue)) {
desc = list_first_entry(&imxdmac->ld_queue,
struct imxdma_desc, node);
if (imxdma_xfer_desc(desc) < 0) {
dev_warn(imxdma->dev,
"%s: channel: %d couldn't issue DMA xfer\n",
__func__, imxdmac->channel);
} else {
list_move_tail(imxdmac->ld_queue.next,
&imxdmac->ld_active);
}
}
spin_unlock_irqrestore(&imxdma->lock, flags);
}
static bool imxdma_filter_fn(struct dma_chan *chan, void *param)
{
struct imxdma_filter_data *fdata = param;
struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan);
if (chan->device->dev != fdata->imxdma->dev)
return false;
imxdma_chan->dma_request = fdata->request;
chan->private = NULL;
return true;
}
static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
int count = dma_spec->args_count;
struct imxdma_engine *imxdma = ofdma->of_dma_data;
struct imxdma_filter_data fdata = {
.imxdma = imxdma,
};
if (count != 1)
return NULL;
fdata.request = dma_spec->args[0];
return dma_request_channel(imxdma->dma_device.cap_mask,
imxdma_filter_fn, &fdata);
}
static int __init imxdma_probe(struct platform_device *pdev)
{
struct imxdma_engine *imxdma;
int ret, i;
int irq, irq_err;
imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL);
if (!imxdma)
return -ENOMEM;
imxdma->dev = &pdev->dev;
imxdma->devtype = (uintptr_t)of_device_get_match_data(&pdev->dev);
imxdma->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(imxdma->base))
return PTR_ERR(imxdma->base);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(imxdma->dma_ipg))
return PTR_ERR(imxdma->dma_ipg);
imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(imxdma->dma_ahb))
return PTR_ERR(imxdma->dma_ahb);
ret = clk_prepare_enable(imxdma->dma_ipg);
if (ret)
return ret;
ret = clk_prepare_enable(imxdma->dma_ahb);
if (ret)
goto disable_dma_ipg_clk;
/* reset DMA module */
imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR);
if (is_imx1_dma(imxdma)) {
ret = devm_request_irq(&pdev->dev, irq,
dma_irq_handler, 0, "DMA", imxdma);
if (ret) {
dev_warn(imxdma->dev, "Can't register IRQ for DMA\n");
goto disable_dma_ahb_clk;
}
imxdma->irq = irq;
irq_err = platform_get_irq(pdev, 1);
if (irq_err < 0) {
ret = irq_err;
goto disable_dma_ahb_clk;
}
ret = devm_request_irq(&pdev->dev, irq_err,
imxdma_err_handler, 0, "DMA", imxdma);
if (ret) {
dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n");
goto disable_dma_ahb_clk;
}
imxdma->irq_err = irq_err;
}
/* enable DMA module */
imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR);
/* clear all interrupts */
imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
/* disable interrupts */
imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
INIT_LIST_HEAD(&imxdma->dma_device.channels);
dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask);
/* Initialize 2D global parameters */
for (i = 0; i < IMX_DMA_2D_SLOTS; i++)
imxdma->slots_2d[i].count = 0;
spin_lock_init(&imxdma->lock);
/* Initialize channel parameters */
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
struct imxdma_channel *imxdmac = &imxdma->channel[i];
if (!is_imx1_dma(imxdma)) {
ret = devm_request_irq(&pdev->dev, irq + i,
dma_irq_handler, 0, "DMA", imxdma);
if (ret) {
dev_warn(imxdma->dev, "Can't register IRQ %d "
"for DMA channel %d\n",
irq + i, i);
goto disable_dma_ahb_clk;
}
imxdmac->irq = irq + i;
timer_setup(&imxdmac->watchdog, imxdma_watchdog, 0);
}
imxdmac->imxdma = imxdma;
INIT_LIST_HEAD(&imxdmac->ld_queue);
INIT_LIST_HEAD(&imxdmac->ld_free);
INIT_LIST_HEAD(&imxdmac->ld_active);
tasklet_setup(&imxdmac->dma_tasklet, imxdma_tasklet);
imxdmac->chan.device = &imxdma->dma_device;
dma_cookie_init(&imxdmac->chan);
imxdmac->channel = i;
/* Add the channel to the DMAC list */
list_add_tail(&imxdmac->chan.device_node,
&imxdma->dma_device.channels);
}
imxdma->dma_device.dev = &pdev->dev;
imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
imxdma->dma_device.device_tx_status = imxdma_tx_status;
imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved;
imxdma->dma_device.device_config = imxdma_config;
imxdma->dma_device.device_terminate_all = imxdma_terminate_all;
imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
platform_set_drvdata(pdev, imxdma);
imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES;
dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
ret = dma_async_device_register(&imxdma->dma_device);
if (ret) {
dev_err(&pdev->dev, "unable to register\n");
goto disable_dma_ahb_clk;
}
if (pdev->dev.of_node) {
ret = of_dma_controller_register(pdev->dev.of_node,
imxdma_xlate, imxdma);
if (ret) {
dev_err(&pdev->dev, "unable to register of_dma_controller\n");
goto err_of_dma_controller;
}
}
return 0;
err_of_dma_controller:
dma_async_device_unregister(&imxdma->dma_device);
disable_dma_ahb_clk:
clk_disable_unprepare(imxdma->dma_ahb);
disable_dma_ipg_clk:
clk_disable_unprepare(imxdma->dma_ipg);
return ret;
}
static void imxdma_free_irq(struct platform_device *pdev, struct imxdma_engine *imxdma)
{
int i;
if (is_imx1_dma(imxdma)) {
disable_irq(imxdma->irq);
disable_irq(imxdma->irq_err);
}
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
struct imxdma_channel *imxdmac = &imxdma->channel[i];
if (!is_imx1_dma(imxdma))
disable_irq(imxdmac->irq);
tasklet_kill(&imxdmac->dma_tasklet);
}
}
static void imxdma_remove(struct platform_device *pdev)
{
struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
imxdma_free_irq(pdev, imxdma);
dma_async_device_unregister(&imxdma->dma_device);
if (pdev->dev.of_node)
of_dma_controller_free(pdev->dev.of_node);
clk_disable_unprepare(imxdma->dma_ipg);
clk_disable_unprepare(imxdma->dma_ahb);
}
static struct platform_driver imxdma_driver = {
.driver = {
.name = "imx-dma",
.of_match_table = imx_dma_of_dev_id,
},
.remove_new = imxdma_remove,
};
static int __init imxdma_module_init(void)
{
return platform_driver_probe(&imxdma_driver, imxdma_probe);
}
subsys_initcall(imxdma_module_init);
MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
MODULE_DESCRIPTION("i.MX dma driver");
MODULE_LICENSE("GPL");
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