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imx-dma.c
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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 <[email protected]>
// Copyright 2012 Javier Martin, Vista Silicon <[email protected]>
#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_device.h>
#include <linux/of_dma.h>
#include <asm/irq.h>
#include <linux/platform_data/dma-imx.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;
memset(&desc->desc, 0, sizeof(struct dma_async_tx_descriptor));
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);
}
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);
}
}