mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 13:13:57 +08:00
e9c8d7a03e
Add a flag to allow platforms to specify, whether a DMAC instance supports the MEMCPY operation. To avoid regressions, preserve the current default. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
1536 lines
39 KiB
C
1536 lines
39 KiB
C
/*
|
|
* Renesas SuperH DMA Engine support
|
|
*
|
|
* base is drivers/dma/flsdma.c
|
|
*
|
|
* Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
|
|
* Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
|
|
* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
|
|
*
|
|
* This is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* - DMA of SuperH does not have Hardware DMA chain mode.
|
|
* - MAX DMA size is 16MB.
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/sh_dma.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/rculist.h>
|
|
#include "shdma.h"
|
|
|
|
/* DMA descriptor control */
|
|
enum sh_dmae_desc_status {
|
|
DESC_IDLE,
|
|
DESC_PREPARED,
|
|
DESC_SUBMITTED,
|
|
DESC_COMPLETED, /* completed, have to call callback */
|
|
DESC_WAITING, /* callback called, waiting for ack / re-submit */
|
|
};
|
|
|
|
#define NR_DESCS_PER_CHANNEL 32
|
|
/* Default MEMCPY transfer size = 2^2 = 4 bytes */
|
|
#define LOG2_DEFAULT_XFER_SIZE 2
|
|
|
|
/*
|
|
* Used for write-side mutual exclusion for the global device list,
|
|
* read-side synchronization by way of RCU, and per-controller data.
|
|
*/
|
|
static DEFINE_SPINLOCK(sh_dmae_lock);
|
|
static LIST_HEAD(sh_dmae_devices);
|
|
|
|
/* A bitmask with bits enough for enum sh_dmae_slave_chan_id */
|
|
static unsigned long sh_dmae_slave_used[BITS_TO_LONGS(SH_DMA_SLAVE_NUMBER)];
|
|
|
|
static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all);
|
|
static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan);
|
|
|
|
static void chclr_write(struct sh_dmae_chan *sh_dc, u32 data)
|
|
{
|
|
struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
|
|
|
|
__raw_writel(data, shdev->chan_reg +
|
|
shdev->pdata->channel[sh_dc->id].chclr_offset);
|
|
}
|
|
|
|
static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
|
|
{
|
|
__raw_writel(data, sh_dc->base + reg / sizeof(u32));
|
|
}
|
|
|
|
static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
|
|
{
|
|
return __raw_readl(sh_dc->base + reg / sizeof(u32));
|
|
}
|
|
|
|
static u16 dmaor_read(struct sh_dmae_device *shdev)
|
|
{
|
|
u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
|
|
|
|
if (shdev->pdata->dmaor_is_32bit)
|
|
return __raw_readl(addr);
|
|
else
|
|
return __raw_readw(addr);
|
|
}
|
|
|
|
static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
|
|
{
|
|
u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
|
|
|
|
if (shdev->pdata->dmaor_is_32bit)
|
|
__raw_writel(data, addr);
|
|
else
|
|
__raw_writew(data, addr);
|
|
}
|
|
|
|
static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
|
|
{
|
|
struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
|
|
|
|
__raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32));
|
|
}
|
|
|
|
static u32 chcr_read(struct sh_dmae_chan *sh_dc)
|
|
{
|
|
struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
|
|
|
|
return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32));
|
|
}
|
|
|
|
/*
|
|
* Reset DMA controller
|
|
*
|
|
* SH7780 has two DMAOR register
|
|
*/
|
|
static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
|
|
{
|
|
unsigned short dmaor;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&sh_dmae_lock, flags);
|
|
|
|
dmaor = dmaor_read(shdev);
|
|
dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
|
|
|
|
spin_unlock_irqrestore(&sh_dmae_lock, flags);
|
|
}
|
|
|
|
static int sh_dmae_rst(struct sh_dmae_device *shdev)
|
|
{
|
|
unsigned short dmaor;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&sh_dmae_lock, flags);
|
|
|
|
dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME);
|
|
|
|
if (shdev->pdata->chclr_present) {
|
|
int i;
|
|
for (i = 0; i < shdev->pdata->channel_num; i++) {
|
|
struct sh_dmae_chan *sh_chan = shdev->chan[i];
|
|
if (sh_chan)
|
|
chclr_write(sh_chan, 0);
|
|
}
|
|
}
|
|
|
|
dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init);
|
|
|
|
dmaor = dmaor_read(shdev);
|
|
|
|
spin_unlock_irqrestore(&sh_dmae_lock, flags);
|
|
|
|
if (dmaor & (DMAOR_AE | DMAOR_NMIF)) {
|
|
dev_warn(shdev->common.dev, "Can't initialize DMAOR.\n");
|
|
return -EIO;
|
|
}
|
|
if (shdev->pdata->dmaor_init & ~dmaor)
|
|
dev_warn(shdev->common.dev,
|
|
"DMAOR=0x%x hasn't latched the initial value 0x%x.\n",
|
|
dmaor, shdev->pdata->dmaor_init);
|
|
return 0;
|
|
}
|
|
|
|
static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
|
|
{
|
|
u32 chcr = chcr_read(sh_chan);
|
|
|
|
if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
|
|
return true; /* working */
|
|
|
|
return false; /* waiting */
|
|
}
|
|
|
|
static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
|
|
{
|
|
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
|
|
struct sh_dmae_pdata *pdata = shdev->pdata;
|
|
int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
|
|
((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
|
|
|
|
if (cnt >= pdata->ts_shift_num)
|
|
cnt = 0;
|
|
|
|
return pdata->ts_shift[cnt];
|
|
}
|
|
|
|
static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
|
|
{
|
|
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
|
|
struct sh_dmae_pdata *pdata = shdev->pdata;
|
|
int i;
|
|
|
|
for (i = 0; i < pdata->ts_shift_num; i++)
|
|
if (pdata->ts_shift[i] == l2size)
|
|
break;
|
|
|
|
if (i == pdata->ts_shift_num)
|
|
i = 0;
|
|
|
|
return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
|
|
((i << pdata->ts_high_shift) & pdata->ts_high_mask);
|
|
}
|
|
|
|
static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
|
|
{
|
|
sh_dmae_writel(sh_chan, hw->sar, SAR);
|
|
sh_dmae_writel(sh_chan, hw->dar, DAR);
|
|
sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR);
|
|
}
|
|
|
|
static void dmae_start(struct sh_dmae_chan *sh_chan)
|
|
{
|
|
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
|
|
u32 chcr = chcr_read(sh_chan);
|
|
|
|
if (shdev->pdata->needs_tend_set)
|
|
sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND);
|
|
|
|
chcr |= CHCR_DE | shdev->chcr_ie_bit;
|
|
chcr_write(sh_chan, chcr & ~CHCR_TE);
|
|
}
|
|
|
|
static void dmae_halt(struct sh_dmae_chan *sh_chan)
|
|
{
|
|
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
|
|
u32 chcr = chcr_read(sh_chan);
|
|
|
|
chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
|
|
chcr_write(sh_chan, chcr);
|
|
}
|
|
|
|
static void dmae_init(struct sh_dmae_chan *sh_chan)
|
|
{
|
|
/*
|
|
* Default configuration for dual address memory-memory transfer.
|
|
* 0x400 represents auto-request.
|
|
*/
|
|
u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
|
|
LOG2_DEFAULT_XFER_SIZE);
|
|
sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
|
|
chcr_write(sh_chan, chcr);
|
|
}
|
|
|
|
static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
|
|
{
|
|
/* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */
|
|
if (dmae_is_busy(sh_chan))
|
|
return -EBUSY;
|
|
|
|
sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
|
|
chcr_write(sh_chan, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
|
|
{
|
|
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
|
|
struct sh_dmae_pdata *pdata = shdev->pdata;
|
|
const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id];
|
|
u16 __iomem *addr = shdev->dmars;
|
|
unsigned int shift = chan_pdata->dmars_bit;
|
|
|
|
if (dmae_is_busy(sh_chan))
|
|
return -EBUSY;
|
|
|
|
if (pdata->no_dmars)
|
|
return 0;
|
|
|
|
/* in the case of a missing DMARS resource use first memory window */
|
|
if (!addr)
|
|
addr = (u16 __iomem *)shdev->chan_reg;
|
|
addr += chan_pdata->dmars / sizeof(u16);
|
|
|
|
__raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
|
|
addr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx)
|
|
{
|
|
struct sh_desc *desc = tx_to_sh_desc(tx), *chunk, *last = desc, *c;
|
|
struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan);
|
|
struct sh_dmae_slave *param = tx->chan->private;
|
|
dma_async_tx_callback callback = tx->callback;
|
|
dma_cookie_t cookie;
|
|
bool power_up;
|
|
|
|
spin_lock_irq(&sh_chan->desc_lock);
|
|
|
|
if (list_empty(&sh_chan->ld_queue))
|
|
power_up = true;
|
|
else
|
|
power_up = false;
|
|
|
|
cookie = sh_chan->common.cookie;
|
|
cookie++;
|
|
if (cookie < 0)
|
|
cookie = 1;
|
|
|
|
sh_chan->common.cookie = cookie;
|
|
tx->cookie = cookie;
|
|
|
|
/* Mark all chunks of this descriptor as submitted, move to the queue */
|
|
list_for_each_entry_safe(chunk, c, desc->node.prev, node) {
|
|
/*
|
|
* All chunks are on the global ld_free, so, we have to find
|
|
* the end of the chain ourselves
|
|
*/
|
|
if (chunk != desc && (chunk->mark == DESC_IDLE ||
|
|
chunk->async_tx.cookie > 0 ||
|
|
chunk->async_tx.cookie == -EBUSY ||
|
|
&chunk->node == &sh_chan->ld_free))
|
|
break;
|
|
chunk->mark = DESC_SUBMITTED;
|
|
/* Callback goes to the last chunk */
|
|
chunk->async_tx.callback = NULL;
|
|
chunk->cookie = cookie;
|
|
list_move_tail(&chunk->node, &sh_chan->ld_queue);
|
|
last = chunk;
|
|
}
|
|
|
|
last->async_tx.callback = callback;
|
|
last->async_tx.callback_param = tx->callback_param;
|
|
|
|
dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n",
|
|
tx->cookie, &last->async_tx, sh_chan->id,
|
|
desc->hw.sar, desc->hw.tcr, desc->hw.dar);
|
|
|
|
if (power_up) {
|
|
sh_chan->pm_state = DMAE_PM_BUSY;
|
|
|
|
pm_runtime_get(sh_chan->dev);
|
|
|
|
spin_unlock_irq(&sh_chan->desc_lock);
|
|
|
|
pm_runtime_barrier(sh_chan->dev);
|
|
|
|
spin_lock_irq(&sh_chan->desc_lock);
|
|
|
|
/* Have we been reset, while waiting? */
|
|
if (sh_chan->pm_state != DMAE_PM_ESTABLISHED) {
|
|
dev_dbg(sh_chan->dev, "Bring up channel %d\n",
|
|
sh_chan->id);
|
|
if (param) {
|
|
const struct sh_dmae_slave_config *cfg =
|
|
param->config;
|
|
|
|
dmae_set_dmars(sh_chan, cfg->mid_rid);
|
|
dmae_set_chcr(sh_chan, cfg->chcr);
|
|
} else {
|
|
dmae_init(sh_chan);
|
|
}
|
|
|
|
if (sh_chan->pm_state == DMAE_PM_PENDING)
|
|
sh_chan_xfer_ld_queue(sh_chan);
|
|
sh_chan->pm_state = DMAE_PM_ESTABLISHED;
|
|
}
|
|
} else {
|
|
sh_chan->pm_state = DMAE_PM_PENDING;
|
|
}
|
|
|
|
spin_unlock_irq(&sh_chan->desc_lock);
|
|
|
|
return cookie;
|
|
}
|
|
|
|
/* Called with desc_lock held */
|
|
static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan)
|
|
{
|
|
struct sh_desc *desc;
|
|
|
|
list_for_each_entry(desc, &sh_chan->ld_free, node)
|
|
if (desc->mark != DESC_PREPARED) {
|
|
BUG_ON(desc->mark != DESC_IDLE);
|
|
list_del(&desc->node);
|
|
return desc;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static const struct sh_dmae_slave_config *sh_dmae_find_slave(
|
|
struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param)
|
|
{
|
|
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
|
|
struct sh_dmae_pdata *pdata = shdev->pdata;
|
|
int i;
|
|
|
|
if (param->slave_id >= SH_DMA_SLAVE_NUMBER)
|
|
return NULL;
|
|
|
|
for (i = 0; i < pdata->slave_num; i++)
|
|
if (pdata->slave[i].slave_id == param->slave_id)
|
|
return pdata->slave + i;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
|
|
struct sh_desc *desc;
|
|
struct sh_dmae_slave *param = chan->private;
|
|
int ret;
|
|
|
|
/*
|
|
* This relies on the guarantee from dmaengine that alloc_chan_resources
|
|
* never runs concurrently with itself or free_chan_resources.
|
|
*/
|
|
if (param) {
|
|
const struct sh_dmae_slave_config *cfg;
|
|
|
|
cfg = sh_dmae_find_slave(sh_chan, param);
|
|
if (!cfg) {
|
|
ret = -EINVAL;
|
|
goto efindslave;
|
|
}
|
|
|
|
if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) {
|
|
ret = -EBUSY;
|
|
goto etestused;
|
|
}
|
|
|
|
param->config = cfg;
|
|
}
|
|
|
|
while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) {
|
|
desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL);
|
|
if (!desc)
|
|
break;
|
|
dma_async_tx_descriptor_init(&desc->async_tx,
|
|
&sh_chan->common);
|
|
desc->async_tx.tx_submit = sh_dmae_tx_submit;
|
|
desc->mark = DESC_IDLE;
|
|
|
|
list_add(&desc->node, &sh_chan->ld_free);
|
|
sh_chan->descs_allocated++;
|
|
}
|
|
|
|
if (!sh_chan->descs_allocated) {
|
|
ret = -ENOMEM;
|
|
goto edescalloc;
|
|
}
|
|
|
|
return sh_chan->descs_allocated;
|
|
|
|
edescalloc:
|
|
if (param)
|
|
clear_bit(param->slave_id, sh_dmae_slave_used);
|
|
etestused:
|
|
efindslave:
|
|
chan->private = NULL;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* sh_dma_free_chan_resources - Free all resources of the channel.
|
|
*/
|
|
static void sh_dmae_free_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
|
|
struct sh_desc *desc, *_desc;
|
|
LIST_HEAD(list);
|
|
|
|
/* Protect against ISR */
|
|
spin_lock_irq(&sh_chan->desc_lock);
|
|
dmae_halt(sh_chan);
|
|
spin_unlock_irq(&sh_chan->desc_lock);
|
|
|
|
/* Now no new interrupts will occur */
|
|
|
|
/* Prepared and not submitted descriptors can still be on the queue */
|
|
if (!list_empty(&sh_chan->ld_queue))
|
|
sh_dmae_chan_ld_cleanup(sh_chan, true);
|
|
|
|
if (chan->private) {
|
|
/* The caller is holding dma_list_mutex */
|
|
struct sh_dmae_slave *param = chan->private;
|
|
clear_bit(param->slave_id, sh_dmae_slave_used);
|
|
chan->private = NULL;
|
|
}
|
|
|
|
spin_lock_irq(&sh_chan->desc_lock);
|
|
|
|
list_splice_init(&sh_chan->ld_free, &list);
|
|
sh_chan->descs_allocated = 0;
|
|
|
|
spin_unlock_irq(&sh_chan->desc_lock);
|
|
|
|
list_for_each_entry_safe(desc, _desc, &list, node)
|
|
kfree(desc);
|
|
}
|
|
|
|
/**
|
|
* sh_dmae_add_desc - get, set up and return one transfer descriptor
|
|
* @sh_chan: DMA channel
|
|
* @flags: DMA transfer flags
|
|
* @dest: destination DMA address, incremented when direction equals
|
|
* DMA_DEV_TO_MEM
|
|
* @src: source DMA address, incremented when direction equals
|
|
* DMA_MEM_TO_DEV
|
|
* @len: DMA transfer length
|
|
* @first: if NULL, set to the current descriptor and cookie set to -EBUSY
|
|
* @direction: needed for slave DMA to decide which address to keep constant,
|
|
* equals DMA_MEM_TO_MEM for MEMCPY
|
|
* Returns 0 or an error
|
|
* Locks: called with desc_lock held
|
|
*/
|
|
static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan,
|
|
unsigned long flags, dma_addr_t *dest, dma_addr_t *src, size_t *len,
|
|
struct sh_desc **first, enum dma_transfer_direction direction)
|
|
{
|
|
struct sh_desc *new;
|
|
size_t copy_size;
|
|
|
|
if (!*len)
|
|
return NULL;
|
|
|
|
/* Allocate the link descriptor from the free list */
|
|
new = sh_dmae_get_desc(sh_chan);
|
|
if (!new) {
|
|
dev_err(sh_chan->dev, "No free link descriptor available\n");
|
|
return NULL;
|
|
}
|
|
|
|
copy_size = min(*len, (size_t)SH_DMA_TCR_MAX + 1);
|
|
|
|
new->hw.sar = *src;
|
|
new->hw.dar = *dest;
|
|
new->hw.tcr = copy_size;
|
|
|
|
if (!*first) {
|
|
/* First desc */
|
|
new->async_tx.cookie = -EBUSY;
|
|
*first = new;
|
|
} else {
|
|
/* Other desc - invisible to the user */
|
|
new->async_tx.cookie = -EINVAL;
|
|
}
|
|
|
|
dev_dbg(sh_chan->dev,
|
|
"chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n",
|
|
copy_size, *len, *src, *dest, &new->async_tx,
|
|
new->async_tx.cookie, sh_chan->xmit_shift);
|
|
|
|
new->mark = DESC_PREPARED;
|
|
new->async_tx.flags = flags;
|
|
new->direction = direction;
|
|
|
|
*len -= copy_size;
|
|
if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV)
|
|
*src += copy_size;
|
|
if (direction == DMA_MEM_TO_MEM || direction == DMA_DEV_TO_MEM)
|
|
*dest += copy_size;
|
|
|
|
return new;
|
|
}
|
|
|
|
/*
|
|
* sh_dmae_prep_sg - prepare transfer descriptors from an SG list
|
|
*
|
|
* Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also
|
|
* converted to scatter-gather to guarantee consistent locking and a correct
|
|
* list manipulation. For slave DMA direction carries the usual meaning, and,
|
|
* logically, the SG list is RAM and the addr variable contains slave address,
|
|
* e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM
|
|
* and the SG list contains only one element and points at the source buffer.
|
|
*/
|
|
static struct dma_async_tx_descriptor *sh_dmae_prep_sg(struct sh_dmae_chan *sh_chan,
|
|
struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr,
|
|
enum dma_transfer_direction direction, unsigned long flags)
|
|
{
|
|
struct scatterlist *sg;
|
|
struct sh_desc *first = NULL, *new = NULL /* compiler... */;
|
|
LIST_HEAD(tx_list);
|
|
int chunks = 0;
|
|
unsigned long irq_flags;
|
|
int i;
|
|
|
|
if (!sg_len)
|
|
return NULL;
|
|
|
|
for_each_sg(sgl, sg, sg_len, i)
|
|
chunks += (sg_dma_len(sg) + SH_DMA_TCR_MAX) /
|
|
(SH_DMA_TCR_MAX + 1);
|
|
|
|
/* Have to lock the whole loop to protect against concurrent release */
|
|
spin_lock_irqsave(&sh_chan->desc_lock, irq_flags);
|
|
|
|
/*
|
|
* Chaining:
|
|
* first descriptor is what user is dealing with in all API calls, its
|
|
* cookie is at first set to -EBUSY, at tx-submit to a positive
|
|
* number
|
|
* if more than one chunk is needed further chunks have cookie = -EINVAL
|
|
* the last chunk, if not equal to the first, has cookie = -ENOSPC
|
|
* all chunks are linked onto the tx_list head with their .node heads
|
|
* only during this function, then they are immediately spliced
|
|
* back onto the free list in form of a chain
|
|
*/
|
|
for_each_sg(sgl, sg, sg_len, i) {
|
|
dma_addr_t sg_addr = sg_dma_address(sg);
|
|
size_t len = sg_dma_len(sg);
|
|
|
|
if (!len)
|
|
goto err_get_desc;
|
|
|
|
do {
|
|
dev_dbg(sh_chan->dev, "Add SG #%d@%p[%d], dma %llx\n",
|
|
i, sg, len, (unsigned long long)sg_addr);
|
|
|
|
if (direction == DMA_DEV_TO_MEM)
|
|
new = sh_dmae_add_desc(sh_chan, flags,
|
|
&sg_addr, addr, &len, &first,
|
|
direction);
|
|
else
|
|
new = sh_dmae_add_desc(sh_chan, flags,
|
|
addr, &sg_addr, &len, &first,
|
|
direction);
|
|
if (!new)
|
|
goto err_get_desc;
|
|
|
|
new->chunks = chunks--;
|
|
list_add_tail(&new->node, &tx_list);
|
|
} while (len);
|
|
}
|
|
|
|
if (new != first)
|
|
new->async_tx.cookie = -ENOSPC;
|
|
|
|
/* Put them back on the free list, so, they don't get lost */
|
|
list_splice_tail(&tx_list, &sh_chan->ld_free);
|
|
|
|
spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags);
|
|
|
|
return &first->async_tx;
|
|
|
|
err_get_desc:
|
|
list_for_each_entry(new, &tx_list, node)
|
|
new->mark = DESC_IDLE;
|
|
list_splice(&tx_list, &sh_chan->ld_free);
|
|
|
|
spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
|
|
struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
|
|
size_t len, unsigned long flags)
|
|
{
|
|
struct sh_dmae_chan *sh_chan;
|
|
struct scatterlist sg;
|
|
|
|
if (!chan || !len)
|
|
return NULL;
|
|
|
|
sh_chan = to_sh_chan(chan);
|
|
|
|
sg_init_table(&sg, 1);
|
|
sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len,
|
|
offset_in_page(dma_src));
|
|
sg_dma_address(&sg) = dma_src;
|
|
sg_dma_len(&sg) = len;
|
|
|
|
return sh_dmae_prep_sg(sh_chan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM,
|
|
flags);
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
|
|
struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
|
|
enum dma_transfer_direction direction, unsigned long flags)
|
|
{
|
|
struct sh_dmae_slave *param;
|
|
struct sh_dmae_chan *sh_chan;
|
|
dma_addr_t slave_addr;
|
|
|
|
if (!chan)
|
|
return NULL;
|
|
|
|
sh_chan = to_sh_chan(chan);
|
|
param = chan->private;
|
|
|
|
/* Someone calling slave DMA on a public channel? */
|
|
if (!param || !sg_len) {
|
|
dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n",
|
|
__func__, param, sg_len, param ? param->slave_id : -1);
|
|
return NULL;
|
|
}
|
|
|
|
slave_addr = param->config->addr;
|
|
|
|
/*
|
|
* if (param != NULL), this is a successfully requested slave channel,
|
|
* therefore param->config != NULL too.
|
|
*/
|
|
return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &slave_addr,
|
|
direction, flags);
|
|
}
|
|
|
|
static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
|
|
unsigned long flags;
|
|
|
|
/* Only supports DMA_TERMINATE_ALL */
|
|
if (cmd != DMA_TERMINATE_ALL)
|
|
return -ENXIO;
|
|
|
|
if (!chan)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&sh_chan->desc_lock, flags);
|
|
dmae_halt(sh_chan);
|
|
|
|
if (!list_empty(&sh_chan->ld_queue)) {
|
|
/* Record partial transfer */
|
|
struct sh_desc *desc = list_entry(sh_chan->ld_queue.next,
|
|
struct sh_desc, node);
|
|
desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
|
|
sh_chan->xmit_shift;
|
|
}
|
|
spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
|
|
|
|
sh_dmae_chan_ld_cleanup(sh_chan, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
|
|
{
|
|
struct sh_desc *desc, *_desc;
|
|
/* Is the "exposed" head of a chain acked? */
|
|
bool head_acked = false;
|
|
dma_cookie_t cookie = 0;
|
|
dma_async_tx_callback callback = NULL;
|
|
void *param = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&sh_chan->desc_lock, flags);
|
|
list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) {
|
|
struct dma_async_tx_descriptor *tx = &desc->async_tx;
|
|
|
|
BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie);
|
|
BUG_ON(desc->mark != DESC_SUBMITTED &&
|
|
desc->mark != DESC_COMPLETED &&
|
|
desc->mark != DESC_WAITING);
|
|
|
|
/*
|
|
* queue is ordered, and we use this loop to (1) clean up all
|
|
* completed descriptors, and to (2) update descriptor flags of
|
|
* any chunks in a (partially) completed chain
|
|
*/
|
|
if (!all && desc->mark == DESC_SUBMITTED &&
|
|
desc->cookie != cookie)
|
|
break;
|
|
|
|
if (tx->cookie > 0)
|
|
cookie = tx->cookie;
|
|
|
|
if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
|
|
if (sh_chan->completed_cookie != desc->cookie - 1)
|
|
dev_dbg(sh_chan->dev,
|
|
"Completing cookie %d, expected %d\n",
|
|
desc->cookie,
|
|
sh_chan->completed_cookie + 1);
|
|
sh_chan->completed_cookie = desc->cookie;
|
|
}
|
|
|
|
/* Call callback on the last chunk */
|
|
if (desc->mark == DESC_COMPLETED && tx->callback) {
|
|
desc->mark = DESC_WAITING;
|
|
callback = tx->callback;
|
|
param = tx->callback_param;
|
|
dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n",
|
|
tx->cookie, tx, sh_chan->id);
|
|
BUG_ON(desc->chunks != 1);
|
|
break;
|
|
}
|
|
|
|
if (tx->cookie > 0 || tx->cookie == -EBUSY) {
|
|
if (desc->mark == DESC_COMPLETED) {
|
|
BUG_ON(tx->cookie < 0);
|
|
desc->mark = DESC_WAITING;
|
|
}
|
|
head_acked = async_tx_test_ack(tx);
|
|
} else {
|
|
switch (desc->mark) {
|
|
case DESC_COMPLETED:
|
|
desc->mark = DESC_WAITING;
|
|
/* Fall through */
|
|
case DESC_WAITING:
|
|
if (head_acked)
|
|
async_tx_ack(&desc->async_tx);
|
|
}
|
|
}
|
|
|
|
dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n",
|
|
tx, tx->cookie);
|
|
|
|
if (((desc->mark == DESC_COMPLETED ||
|
|
desc->mark == DESC_WAITING) &&
|
|
async_tx_test_ack(&desc->async_tx)) || all) {
|
|
/* Remove from ld_queue list */
|
|
desc->mark = DESC_IDLE;
|
|
|
|
list_move(&desc->node, &sh_chan->ld_free);
|
|
|
|
if (list_empty(&sh_chan->ld_queue)) {
|
|
dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id);
|
|
pm_runtime_put(sh_chan->dev);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (all && !callback)
|
|
/*
|
|
* Terminating and the loop completed normally: forgive
|
|
* uncompleted cookies
|
|
*/
|
|
sh_chan->completed_cookie = sh_chan->common.cookie;
|
|
|
|
spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
|
|
|
|
if (callback)
|
|
callback(param);
|
|
|
|
return callback;
|
|
}
|
|
|
|
/*
|
|
* sh_chan_ld_cleanup - Clean up link descriptors
|
|
*
|
|
* This function cleans up the ld_queue of DMA channel.
|
|
*/
|
|
static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
|
|
{
|
|
while (__ld_cleanup(sh_chan, all))
|
|
;
|
|
}
|
|
|
|
/* Called under spin_lock_irq(&sh_chan->desc_lock) */
|
|
static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
|
|
{
|
|
struct sh_desc *desc;
|
|
|
|
/* DMA work check */
|
|
if (dmae_is_busy(sh_chan))
|
|
return;
|
|
|
|
/* Find the first not transferred descriptor */
|
|
list_for_each_entry(desc, &sh_chan->ld_queue, node)
|
|
if (desc->mark == DESC_SUBMITTED) {
|
|
dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n",
|
|
desc->async_tx.cookie, sh_chan->id,
|
|
desc->hw.tcr, desc->hw.sar, desc->hw.dar);
|
|
/* Get the ld start address from ld_queue */
|
|
dmae_set_reg(sh_chan, &desc->hw);
|
|
dmae_start(sh_chan);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
|
|
|
|
spin_lock_irq(&sh_chan->desc_lock);
|
|
if (sh_chan->pm_state == DMAE_PM_ESTABLISHED)
|
|
sh_chan_xfer_ld_queue(sh_chan);
|
|
else
|
|
sh_chan->pm_state = DMAE_PM_PENDING;
|
|
spin_unlock_irq(&sh_chan->desc_lock);
|
|
}
|
|
|
|
static enum dma_status sh_dmae_tx_status(struct dma_chan *chan,
|
|
dma_cookie_t cookie,
|
|
struct dma_tx_state *txstate)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
|
|
dma_cookie_t last_used;
|
|
dma_cookie_t last_complete;
|
|
enum dma_status status;
|
|
unsigned long flags;
|
|
|
|
sh_dmae_chan_ld_cleanup(sh_chan, false);
|
|
|
|
/* First read completed cookie to avoid a skew */
|
|
last_complete = sh_chan->completed_cookie;
|
|
rmb();
|
|
last_used = chan->cookie;
|
|
BUG_ON(last_complete < 0);
|
|
dma_set_tx_state(txstate, last_complete, last_used, 0);
|
|
|
|
spin_lock_irqsave(&sh_chan->desc_lock, flags);
|
|
|
|
status = dma_async_is_complete(cookie, last_complete, last_used);
|
|
|
|
/*
|
|
* If we don't find cookie on the queue, it has been aborted and we have
|
|
* to report error
|
|
*/
|
|
if (status != DMA_SUCCESS) {
|
|
struct sh_desc *desc;
|
|
status = DMA_ERROR;
|
|
list_for_each_entry(desc, &sh_chan->ld_queue, node)
|
|
if (desc->cookie == cookie) {
|
|
status = DMA_IN_PROGRESS;
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
|
|
|
|
return status;
|
|
}
|
|
|
|
static irqreturn_t sh_dmae_interrupt(int irq, void *data)
|
|
{
|
|
irqreturn_t ret = IRQ_NONE;
|
|
struct sh_dmae_chan *sh_chan = data;
|
|
u32 chcr;
|
|
|
|
spin_lock(&sh_chan->desc_lock);
|
|
|
|
chcr = chcr_read(sh_chan);
|
|
|
|
if (chcr & CHCR_TE) {
|
|
/* DMA stop */
|
|
dmae_halt(sh_chan);
|
|
|
|
ret = IRQ_HANDLED;
|
|
tasklet_schedule(&sh_chan->tasklet);
|
|
}
|
|
|
|
spin_unlock(&sh_chan->desc_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Called from error IRQ or NMI */
|
|
static bool sh_dmae_reset(struct sh_dmae_device *shdev)
|
|
{
|
|
unsigned int handled = 0;
|
|
int i;
|
|
|
|
/* halt the dma controller */
|
|
sh_dmae_ctl_stop(shdev);
|
|
|
|
/* We cannot detect, which channel caused the error, have to reset all */
|
|
for (i = 0; i < SH_DMAC_MAX_CHANNELS; i++) {
|
|
struct sh_dmae_chan *sh_chan = shdev->chan[i];
|
|
struct sh_desc *desc;
|
|
LIST_HEAD(dl);
|
|
|
|
if (!sh_chan)
|
|
continue;
|
|
|
|
spin_lock(&sh_chan->desc_lock);
|
|
|
|
/* Stop the channel */
|
|
dmae_halt(sh_chan);
|
|
|
|
list_splice_init(&sh_chan->ld_queue, &dl);
|
|
|
|
if (!list_empty(&dl)) {
|
|
dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id);
|
|
pm_runtime_put(sh_chan->dev);
|
|
}
|
|
sh_chan->pm_state = DMAE_PM_ESTABLISHED;
|
|
|
|
spin_unlock(&sh_chan->desc_lock);
|
|
|
|
/* Complete all */
|
|
list_for_each_entry(desc, &dl, node) {
|
|
struct dma_async_tx_descriptor *tx = &desc->async_tx;
|
|
desc->mark = DESC_IDLE;
|
|
if (tx->callback)
|
|
tx->callback(tx->callback_param);
|
|
}
|
|
|
|
spin_lock(&sh_chan->desc_lock);
|
|
list_splice(&dl, &sh_chan->ld_free);
|
|
spin_unlock(&sh_chan->desc_lock);
|
|
|
|
handled++;
|
|
}
|
|
|
|
sh_dmae_rst(shdev);
|
|
|
|
return !!handled;
|
|
}
|
|
|
|
static irqreturn_t sh_dmae_err(int irq, void *data)
|
|
{
|
|
struct sh_dmae_device *shdev = data;
|
|
|
|
if (!(dmaor_read(shdev) & DMAOR_AE))
|
|
return IRQ_NONE;
|
|
|
|
sh_dmae_reset(data);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void dmae_do_tasklet(unsigned long data)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
|
|
struct sh_desc *desc;
|
|
u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
|
|
u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
|
|
|
|
spin_lock_irq(&sh_chan->desc_lock);
|
|
list_for_each_entry(desc, &sh_chan->ld_queue, node) {
|
|
if (desc->mark == DESC_SUBMITTED &&
|
|
((desc->direction == DMA_DEV_TO_MEM &&
|
|
(desc->hw.dar + desc->hw.tcr) == dar_buf) ||
|
|
(desc->hw.sar + desc->hw.tcr) == sar_buf)) {
|
|
dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n",
|
|
desc->async_tx.cookie, &desc->async_tx,
|
|
desc->hw.dar);
|
|
desc->mark = DESC_COMPLETED;
|
|
break;
|
|
}
|
|
}
|
|
/* Next desc */
|
|
sh_chan_xfer_ld_queue(sh_chan);
|
|
spin_unlock_irq(&sh_chan->desc_lock);
|
|
|
|
sh_dmae_chan_ld_cleanup(sh_chan, false);
|
|
}
|
|
|
|
static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
|
|
{
|
|
/* Fast path out if NMIF is not asserted for this controller */
|
|
if ((dmaor_read(shdev) & DMAOR_NMIF) == 0)
|
|
return false;
|
|
|
|
return sh_dmae_reset(shdev);
|
|
}
|
|
|
|
static int sh_dmae_nmi_handler(struct notifier_block *self,
|
|
unsigned long cmd, void *data)
|
|
{
|
|
struct sh_dmae_device *shdev;
|
|
int ret = NOTIFY_DONE;
|
|
bool triggered;
|
|
|
|
/*
|
|
* Only concern ourselves with NMI events.
|
|
*
|
|
* Normally we would check the die chain value, but as this needs
|
|
* to be architecture independent, check for NMI context instead.
|
|
*/
|
|
if (!in_nmi())
|
|
return NOTIFY_DONE;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) {
|
|
/*
|
|
* Only stop if one of the controllers has NMIF asserted,
|
|
* we do not want to interfere with regular address error
|
|
* handling or NMI events that don't concern the DMACs.
|
|
*/
|
|
triggered = sh_dmae_nmi_notify(shdev);
|
|
if (triggered == true)
|
|
ret = NOTIFY_OK;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
|
|
.notifier_call = sh_dmae_nmi_handler,
|
|
|
|
/* Run before NMI debug handler and KGDB */
|
|
.priority = 1,
|
|
};
|
|
|
|
static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
|
|
int irq, unsigned long flags)
|
|
{
|
|
int err;
|
|
const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
|
|
struct platform_device *pdev = to_platform_device(shdev->common.dev);
|
|
struct sh_dmae_chan *new_sh_chan;
|
|
|
|
/* alloc channel */
|
|
new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
|
|
if (!new_sh_chan) {
|
|
dev_err(shdev->common.dev,
|
|
"No free memory for allocating dma channels!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
new_sh_chan->pm_state = DMAE_PM_ESTABLISHED;
|
|
|
|
/* reference struct dma_device */
|
|
new_sh_chan->common.device = &shdev->common;
|
|
|
|
new_sh_chan->dev = shdev->common.dev;
|
|
new_sh_chan->id = id;
|
|
new_sh_chan->irq = irq;
|
|
new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
|
|
|
|
/* Init DMA tasklet */
|
|
tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet,
|
|
(unsigned long)new_sh_chan);
|
|
|
|
spin_lock_init(&new_sh_chan->desc_lock);
|
|
|
|
/* Init descripter manage list */
|
|
INIT_LIST_HEAD(&new_sh_chan->ld_queue);
|
|
INIT_LIST_HEAD(&new_sh_chan->ld_free);
|
|
|
|
/* Add the channel to DMA device channel list */
|
|
list_add_tail(&new_sh_chan->common.device_node,
|
|
&shdev->common.channels);
|
|
shdev->common.chancnt++;
|
|
|
|
if (pdev->id >= 0)
|
|
snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
|
|
"sh-dmae%d.%d", pdev->id, new_sh_chan->id);
|
|
else
|
|
snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
|
|
"sh-dma%d", new_sh_chan->id);
|
|
|
|
/* set up channel irq */
|
|
err = request_irq(irq, &sh_dmae_interrupt, flags,
|
|
new_sh_chan->dev_id, new_sh_chan);
|
|
if (err) {
|
|
dev_err(shdev->common.dev, "DMA channel %d request_irq error "
|
|
"with return %d\n", id, err);
|
|
goto err_no_irq;
|
|
}
|
|
|
|
shdev->chan[id] = new_sh_chan;
|
|
return 0;
|
|
|
|
err_no_irq:
|
|
/* remove from dmaengine device node */
|
|
list_del(&new_sh_chan->common.device_node);
|
|
kfree(new_sh_chan);
|
|
return err;
|
|
}
|
|
|
|
static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
|
|
{
|
|
int i;
|
|
|
|
for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) {
|
|
if (shdev->chan[i]) {
|
|
struct sh_dmae_chan *sh_chan = shdev->chan[i];
|
|
|
|
free_irq(sh_chan->irq, sh_chan);
|
|
|
|
list_del(&sh_chan->common.device_node);
|
|
kfree(sh_chan);
|
|
shdev->chan[i] = NULL;
|
|
}
|
|
}
|
|
shdev->common.chancnt = 0;
|
|
}
|
|
|
|
static int __init sh_dmae_probe(struct platform_device *pdev)
|
|
{
|
|
struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
|
|
unsigned long irqflags = IRQF_DISABLED,
|
|
chan_flag[SH_DMAC_MAX_CHANNELS] = {};
|
|
int errirq, chan_irq[SH_DMAC_MAX_CHANNELS];
|
|
int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0;
|
|
struct sh_dmae_device *shdev;
|
|
struct resource *chan, *dmars, *errirq_res, *chanirq_res;
|
|
|
|
/* get platform data */
|
|
if (!pdata || !pdata->channel_num)
|
|
return -ENODEV;
|
|
|
|
chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
/* DMARS area is optional */
|
|
dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
/*
|
|
* IRQ resources:
|
|
* 1. there always must be at least one IRQ IO-resource. On SH4 it is
|
|
* the error IRQ, in which case it is the only IRQ in this resource:
|
|
* start == end. If it is the only IRQ resource, all channels also
|
|
* use the same IRQ.
|
|
* 2. DMA channel IRQ resources can be specified one per resource or in
|
|
* ranges (start != end)
|
|
* 3. iff all events (channels and, optionally, error) on this
|
|
* controller use the same IRQ, only one IRQ resource can be
|
|
* specified, otherwise there must be one IRQ per channel, even if
|
|
* some of them are equal
|
|
* 4. if all IRQs on this controller are equal or if some specific IRQs
|
|
* specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
|
|
* requested with the IRQF_SHARED flag
|
|
*/
|
|
errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (!chan || !errirq_res)
|
|
return -ENODEV;
|
|
|
|
if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) {
|
|
dev_err(&pdev->dev, "DMAC register region already claimed\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) {
|
|
dev_err(&pdev->dev, "DMAC DMARS region already claimed\n");
|
|
err = -EBUSY;
|
|
goto ermrdmars;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
|
|
if (!shdev) {
|
|
dev_err(&pdev->dev, "Not enough memory\n");
|
|
goto ealloc;
|
|
}
|
|
|
|
shdev->chan_reg = ioremap(chan->start, resource_size(chan));
|
|
if (!shdev->chan_reg)
|
|
goto emapchan;
|
|
if (dmars) {
|
|
shdev->dmars = ioremap(dmars->start, resource_size(dmars));
|
|
if (!shdev->dmars)
|
|
goto emapdmars;
|
|
}
|
|
|
|
/* platform data */
|
|
shdev->pdata = pdata;
|
|
|
|
if (pdata->chcr_offset)
|
|
shdev->chcr_offset = pdata->chcr_offset;
|
|
else
|
|
shdev->chcr_offset = CHCR;
|
|
|
|
if (pdata->chcr_ie_bit)
|
|
shdev->chcr_ie_bit = pdata->chcr_ie_bit;
|
|
else
|
|
shdev->chcr_ie_bit = CHCR_IE;
|
|
|
|
platform_set_drvdata(pdev, shdev);
|
|
|
|
shdev->common.dev = &pdev->dev;
|
|
|
|
pm_runtime_enable(&pdev->dev);
|
|
pm_runtime_get_sync(&pdev->dev);
|
|
|
|
spin_lock_irq(&sh_dmae_lock);
|
|
list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
|
|
spin_unlock_irq(&sh_dmae_lock);
|
|
|
|
/* reset dma controller - only needed as a test */
|
|
err = sh_dmae_rst(shdev);
|
|
if (err)
|
|
goto rst_err;
|
|
|
|
INIT_LIST_HEAD(&shdev->common.channels);
|
|
|
|
if (!pdata->slave_only)
|
|
dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
|
|
if (pdata->slave && pdata->slave_num)
|
|
dma_cap_set(DMA_SLAVE, shdev->common.cap_mask);
|
|
|
|
shdev->common.device_alloc_chan_resources
|
|
= sh_dmae_alloc_chan_resources;
|
|
shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
|
|
shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
|
|
shdev->common.device_tx_status = sh_dmae_tx_status;
|
|
shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
|
|
|
|
/* Compulsory for DMA_SLAVE fields */
|
|
shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg;
|
|
shdev->common.device_control = sh_dmae_control;
|
|
|
|
/* Default transfer size of 32 bytes requires 32-byte alignment */
|
|
shdev->common.copy_align = LOG2_DEFAULT_XFER_SIZE;
|
|
|
|
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
|
|
chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
|
|
|
|
if (!chanirq_res)
|
|
chanirq_res = errirq_res;
|
|
else
|
|
irqres++;
|
|
|
|
if (chanirq_res == errirq_res ||
|
|
(errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
|
|
irqflags = IRQF_SHARED;
|
|
|
|
errirq = errirq_res->start;
|
|
|
|
err = request_irq(errirq, sh_dmae_err, irqflags,
|
|
"DMAC Address Error", shdev);
|
|
if (err) {
|
|
dev_err(&pdev->dev,
|
|
"DMA failed requesting irq #%d, error %d\n",
|
|
errirq, err);
|
|
goto eirq_err;
|
|
}
|
|
|
|
#else
|
|
chanirq_res = errirq_res;
|
|
#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */
|
|
|
|
if (chanirq_res->start == chanirq_res->end &&
|
|
!platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
|
|
/* Special case - all multiplexed */
|
|
for (; irq_cnt < pdata->channel_num; irq_cnt++) {
|
|
if (irq_cnt < SH_DMAC_MAX_CHANNELS) {
|
|
chan_irq[irq_cnt] = chanirq_res->start;
|
|
chan_flag[irq_cnt] = IRQF_SHARED;
|
|
} else {
|
|
irq_cap = 1;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
do {
|
|
for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
|
|
if (irq_cnt >= SH_DMAC_MAX_CHANNELS) {
|
|
irq_cap = 1;
|
|
break;
|
|
}
|
|
|
|
if ((errirq_res->flags & IORESOURCE_BITS) ==
|
|
IORESOURCE_IRQ_SHAREABLE)
|
|
chan_flag[irq_cnt] = IRQF_SHARED;
|
|
else
|
|
chan_flag[irq_cnt] = IRQF_DISABLED;
|
|
dev_dbg(&pdev->dev,
|
|
"Found IRQ %d for channel %d\n",
|
|
i, irq_cnt);
|
|
chan_irq[irq_cnt++] = i;
|
|
}
|
|
|
|
if (irq_cnt >= SH_DMAC_MAX_CHANNELS)
|
|
break;
|
|
|
|
chanirq_res = platform_get_resource(pdev,
|
|
IORESOURCE_IRQ, ++irqres);
|
|
} while (irq_cnt < pdata->channel_num && chanirq_res);
|
|
}
|
|
|
|
/* Create DMA Channel */
|
|
for (i = 0; i < irq_cnt; i++) {
|
|
err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
|
|
if (err)
|
|
goto chan_probe_err;
|
|
}
|
|
|
|
if (irq_cap)
|
|
dev_notice(&pdev->dev, "Attempting to register %d DMA "
|
|
"channels when a maximum of %d are supported.\n",
|
|
pdata->channel_num, SH_DMAC_MAX_CHANNELS);
|
|
|
|
pm_runtime_put(&pdev->dev);
|
|
|
|
dma_async_device_register(&shdev->common);
|
|
|
|
return err;
|
|
|
|
chan_probe_err:
|
|
sh_dmae_chan_remove(shdev);
|
|
|
|
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
|
|
free_irq(errirq, shdev);
|
|
eirq_err:
|
|
#endif
|
|
rst_err:
|
|
spin_lock_irq(&sh_dmae_lock);
|
|
list_del_rcu(&shdev->node);
|
|
spin_unlock_irq(&sh_dmae_lock);
|
|
|
|
pm_runtime_put(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
if (dmars)
|
|
iounmap(shdev->dmars);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
emapdmars:
|
|
iounmap(shdev->chan_reg);
|
|
synchronize_rcu();
|
|
emapchan:
|
|
kfree(shdev);
|
|
ealloc:
|
|
if (dmars)
|
|
release_mem_region(dmars->start, resource_size(dmars));
|
|
ermrdmars:
|
|
release_mem_region(chan->start, resource_size(chan));
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __exit sh_dmae_remove(struct platform_device *pdev)
|
|
{
|
|
struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
|
|
struct resource *res;
|
|
int errirq = platform_get_irq(pdev, 0);
|
|
|
|
dma_async_device_unregister(&shdev->common);
|
|
|
|
if (errirq > 0)
|
|
free_irq(errirq, shdev);
|
|
|
|
spin_lock_irq(&sh_dmae_lock);
|
|
list_del_rcu(&shdev->node);
|
|
spin_unlock_irq(&sh_dmae_lock);
|
|
|
|
/* channel data remove */
|
|
sh_dmae_chan_remove(shdev);
|
|
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
if (shdev->dmars)
|
|
iounmap(shdev->dmars);
|
|
iounmap(shdev->chan_reg);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
synchronize_rcu();
|
|
kfree(shdev);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (res)
|
|
release_mem_region(res->start, resource_size(res));
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
if (res)
|
|
release_mem_region(res->start, resource_size(res));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sh_dmae_shutdown(struct platform_device *pdev)
|
|
{
|
|
struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
|
|
sh_dmae_ctl_stop(shdev);
|
|
}
|
|
|
|
static int sh_dmae_runtime_suspend(struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int sh_dmae_runtime_resume(struct device *dev)
|
|
{
|
|
struct sh_dmae_device *shdev = dev_get_drvdata(dev);
|
|
|
|
return sh_dmae_rst(shdev);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int sh_dmae_suspend(struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int sh_dmae_resume(struct device *dev)
|
|
{
|
|
struct sh_dmae_device *shdev = dev_get_drvdata(dev);
|
|
int i, ret;
|
|
|
|
ret = sh_dmae_rst(shdev);
|
|
if (ret < 0)
|
|
dev_err(dev, "Failed to reset!\n");
|
|
|
|
for (i = 0; i < shdev->pdata->channel_num; i++) {
|
|
struct sh_dmae_chan *sh_chan = shdev->chan[i];
|
|
struct sh_dmae_slave *param = sh_chan->common.private;
|
|
|
|
if (!sh_chan->descs_allocated)
|
|
continue;
|
|
|
|
if (param) {
|
|
const struct sh_dmae_slave_config *cfg = param->config;
|
|
dmae_set_dmars(sh_chan, cfg->mid_rid);
|
|
dmae_set_chcr(sh_chan, cfg->chcr);
|
|
} else {
|
|
dmae_init(sh_chan);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define sh_dmae_suspend NULL
|
|
#define sh_dmae_resume NULL
|
|
#endif
|
|
|
|
const struct dev_pm_ops sh_dmae_pm = {
|
|
.suspend = sh_dmae_suspend,
|
|
.resume = sh_dmae_resume,
|
|
.runtime_suspend = sh_dmae_runtime_suspend,
|
|
.runtime_resume = sh_dmae_runtime_resume,
|
|
};
|
|
|
|
static struct platform_driver sh_dmae_driver = {
|
|
.remove = __exit_p(sh_dmae_remove),
|
|
.shutdown = sh_dmae_shutdown,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "sh-dma-engine",
|
|
.pm = &sh_dmae_pm,
|
|
},
|
|
};
|
|
|
|
static int __init sh_dmae_init(void)
|
|
{
|
|
/* Wire up NMI handling */
|
|
int err = register_die_notifier(&sh_dmae_nmi_notifier);
|
|
if (err)
|
|
return err;
|
|
|
|
return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
|
|
}
|
|
module_init(sh_dmae_init);
|
|
|
|
static void __exit sh_dmae_exit(void)
|
|
{
|
|
platform_driver_unregister(&sh_dmae_driver);
|
|
|
|
unregister_die_notifier(&sh_dmae_nmi_notifier);
|
|
}
|
|
module_exit(sh_dmae_exit);
|
|
|
|
MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
|
|
MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:sh-dma-engine");
|