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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx

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* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (21 commits)
  dmaengine: add slave-dma maintainer
  dma: ipu_idmac: do not lose valid received data in the irq handler
  dmaengine: imx-sdma: fix up param for the last BD in sdma_prep_slave_sg()
  dmaengine: imx-sdma: correct sdmac->status in sdma_handle_channel_loop()
  dmaengine: imx-sdma: return sdmac->status in sdma_tx_status()
  dmaengine: imx-sdma: set sdmac->status to DMA_ERROR in err_out of sdma_prep_slave_sg()
  dmaengine: imx-sdma: remove IMX_DMA_SG_LOOP handling in sdma_prep_slave_sg()
  dmaengine i.MX dma: initialize dma capabilities outside channel loop
  dmaengine i.MX DMA: do not initialize chan_id field
  dmaengine i.MX dma: check sg entries for valid addresses and lengths
  dmaengine i.MX dma: set maximum segment size for our device
  dmaengine i.MX SDMA: reserve channel 0 by not registering it
  dmaengine i.MX SDMA: initialize dma capabilities outside channel loop
  dmaengine i.MX SDMA: do not initialize chan_id field
  dmaengine i.MX sdma: check sg entries for valid addresses and lengths
  dmaengine i.MX sdma: set maximum segment size for our device
  DMA: PL08x: fix channel pausing to timeout rather than lockup
  DMA: PL08x: fix infinite wait when terminating transfers
  dmaengine: imx-sdma: fix inconsistent naming in sdma_assign_cookie()
  dmaengine: imx-sdma: propagate error in sdma_probe() instead of returning 0
  ...
This commit is contained in:
Linus Torvalds 2011-02-15 12:07:35 -08:00
parent f60c153d50 4abed0af1e
commit b45bbf0772
5 changed files with 103 additions and 115 deletions
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1
MAINTAINERS
View file

@ -2126,6 +2126,7 @@ S: Supported
F: fs/dlm/
DMA GENERIC OFFLOAD ENGINE SUBSYSTEM
M: Vinod Koul <vinod.koul@intel.com>
M: Dan Williams <dan.j.williams@intel.com>
S: Supported
F: drivers/dma/

53
drivers/dma/amba-pl08x.c
View file

@ -79,6 +79,7 @@
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/dmapool.h>
#include <linux/dmaengine.h>
#include <linux/amba/bus.h>
@ -235,16 +236,19 @@ static void pl08x_start_txd(struct pl08x_dma_chan *plchan,
}
/*
* Overall DMAC remains enabled always.
* Pause the channel by setting the HALT bit.
*
* Disabling individual channels could lose data.
* For M->P transfers, pause the DMAC first and then stop the peripheral -
* the FIFO can only drain if the peripheral is still requesting data.
* (note: this can still timeout if the DMAC FIFO never drains of data.)
*
* Disable the peripheral DMA after disabling the DMAC in order to allow
* the DMAC FIFO to drain, and hence allow the channel to show inactive
* For P->M transfers, disable the peripheral first to stop it filling
* the DMAC FIFO, and then pause the DMAC.
*/
static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
{
u32 val;
int timeout;
/* Set the HALT bit and wait for the FIFO to drain */
val = readl(ch->base + PL080_CH_CONFIG);
@ -252,8 +256,13 @@ static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
writel(val, ch->base + PL080_CH_CONFIG);
/* Wait for channel inactive */
while (pl08x_phy_channel_busy(ch))
cpu_relax();
for (timeout = 1000; timeout; timeout--) {
if (!pl08x_phy_channel_busy(ch))
break;
udelay(1);
}
if (pl08x_phy_channel_busy(ch))
pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id);
}
static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)
@ -267,19 +276,24 @@ static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)
}
/* Stops the channel */
static void pl08x_stop_phy_chan(struct pl08x_phy_chan *ch)
/*
* pl08x_terminate_phy_chan() stops the channel, clears the FIFO and
* clears any pending interrupt status. This should not be used for
* an on-going transfer, but as a method of shutting down a channel
* (eg, when it's no longer used) or terminating a transfer.
*/
static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x,
struct pl08x_phy_chan *ch)
{
u32 val;
u32 val = readl(ch->base + PL080_CH_CONFIG);
pl08x_pause_phy_chan(ch);
val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK |
PL080_CONFIG_TC_IRQ_MASK);
/* Disable channel */
val = readl(ch->base + PL080_CH_CONFIG);
val &= ~PL080_CONFIG_ENABLE;
val &= ~PL080_CONFIG_ERR_IRQ_MASK;
val &= ~PL080_CONFIG_TC_IRQ_MASK;
writel(val, ch->base + PL080_CH_CONFIG);
writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR);
writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR);
}
static inline u32 get_bytes_in_cctl(u32 cctl)
@ -404,13 +418,12 @@ static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
{
unsigned long flags;
spin_lock_irqsave(&ch->lock, flags);
/* Stop the channel and clear its interrupts */
pl08x_stop_phy_chan(ch);
writel((1 << ch->id), pl08x->base + PL080_ERR_CLEAR);
writel((1 << ch->id), pl08x->base + PL080_TC_CLEAR);
pl08x_terminate_phy_chan(pl08x, ch);
/* Mark it as free */
spin_lock_irqsave(&ch->lock, flags);
ch->serving = NULL;
spin_unlock_irqrestore(&ch->lock, flags);
}
@ -1449,7 +1462,7 @@ static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
plchan->state = PL08X_CHAN_IDLE;
if (plchan->phychan) {
pl08x_stop_phy_chan(plchan->phychan);
pl08x_terminate_phy_chan(pl08x, plchan->phychan);
/*
* Mark physical channel as free and free any slave

26
drivers/dma/imx-dma.c
View file

@ -49,6 +49,7 @@ struct imxdma_channel {
struct imxdma_engine {
struct device *dev;
struct device_dma_parameters dma_parms;
struct dma_device dma_device;
struct imxdma_channel channel[MAX_DMA_CHANNELS];
};
@ -242,6 +243,21 @@ static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
else
dmamode = DMA_MODE_WRITE;
switch (imxdmac->word_size) {
case DMA_SLAVE_BUSWIDTH_4_BYTES:
if (sgl->length & 3 || sgl->dma_address & 3)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
if (sgl->length & 1 || sgl->dma_address & 1)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_1_BYTE:
break;
default:
return NULL;
}
ret = imx_dma_setup_sg(imxdmac->imxdma_channel, sgl, sg_len,
dma_length, imxdmac->per_address, dmamode);
if (ret)
@ -329,6 +345,9 @@ static int __init imxdma_probe(struct platform_device *pdev)
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);
/* Initialize channel parameters */
for (i = 0; i < MAX_DMA_CHANNELS; i++) {
struct imxdma_channel *imxdmac = &imxdma->channel[i];
@ -346,11 +365,7 @@ static int __init imxdma_probe(struct platform_device *pdev)
imxdmac->imxdma = imxdma;
spin_lock_init(&imxdmac->lock);
dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
imxdmac->chan.device = &imxdma->dma_device;
imxdmac->chan.chan_id = i;
imxdmac->channel = i;
/* Add the channel to the DMAC list */
@ -370,6 +385,9 @@ static int __init imxdma_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, imxdma);
imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
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");

88
drivers/dma/imx-sdma.c
View file

@ -230,7 +230,7 @@ struct sdma_engine;
* struct sdma_channel - housekeeping for a SDMA channel
*
* @sdma pointer to the SDMA engine for this channel
* @channel the channel number, matches dmaengine chan_id
* @channel the channel number, matches dmaengine chan_id + 1
* @direction transfer type. Needed for setting SDMA script
* @peripheral_type Peripheral type. Needed for setting SDMA script
* @event_id0 aka dma request line
@ -301,6 +301,7 @@ struct sdma_firmware_header {
struct sdma_engine {
struct device *dev;
struct device_dma_parameters dma_parms;
struct sdma_channel channel[MAX_DMA_CHANNELS];
struct sdma_channel_control *channel_control;
void __iomem *regs;
@ -449,7 +450,7 @@ static void sdma_handle_channel_loop(struct sdma_channel *sdmac)
if (bd->mode.status & BD_RROR)
sdmac->status = DMA_ERROR;
else
sdmac->status = DMA_SUCCESS;
sdmac->status = DMA_IN_PROGRESS;
bd->mode.status |= BD_DONE;
sdmac->buf_tail++;
@ -770,15 +771,15 @@ static void sdma_enable_channel(struct sdma_engine *sdma, int channel)
__raw_writel(1 << channel, sdma->regs + SDMA_H_START);
}
static dma_cookie_t sdma_assign_cookie(struct sdma_channel *sdma)
static dma_cookie_t sdma_assign_cookie(struct sdma_channel *sdmac)
{
dma_cookie_t cookie = sdma->chan.cookie;
dma_cookie_t cookie = sdmac->chan.cookie;
if (++cookie < 0)
cookie = 1;
sdma->chan.cookie = cookie;
sdma->desc.cookie = cookie;
sdmac->chan.cookie = cookie;
sdmac->desc.cookie = cookie;
return cookie;
}
@ -798,7 +799,7 @@ static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx)
cookie = sdma_assign_cookie(sdmac);
sdma_enable_channel(sdma, tx->chan->chan_id);
sdma_enable_channel(sdma, sdmac->channel);
spin_unlock_irq(&sdmac->lock);
@ -811,10 +812,6 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan)
struct imx_dma_data *data = chan->private;
int prio, ret;
/* No need to execute this for internal channel 0 */
if (chan->chan_id == 0)
return 0;
if (!data)
return -EINVAL;
@ -879,7 +876,7 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct sdma_engine *sdma = sdmac->sdma;
int ret, i, count;
int channel = chan->chan_id;
int channel = sdmac->channel;
struct scatterlist *sg;
if (sdmac->status == DMA_IN_PROGRESS)
@ -924,22 +921,33 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
ret = -EINVAL;
goto err_out;
}
if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES)
switch (sdmac->word_size) {
case DMA_SLAVE_BUSWIDTH_4_BYTES:
bd->mode.command = 0;
else
bd->mode.command = sdmac->word_size;
if (count & 3 || sg->dma_address & 3)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
bd->mode.command = 2;
if (count & 1 || sg->dma_address & 1)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_1_BYTE:
bd->mode.command = 1;
break;
default:
return NULL;
}
param = BD_DONE | BD_EXTD | BD_CONT;
if (sdmac->flags & IMX_DMA_SG_LOOP) {
if (i + 1 == sg_len) {
param |= BD_INTR;
if (i + 1 == sg_len)
param |= BD_WRAP;
param |= BD_LAST;
param &= ~BD_CONT;
}
if (i + 1 == sg_len)
param |= BD_INTR;
dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n",
i, count, sg->dma_address,
param & BD_WRAP ? "wrap" : "",
@ -953,6 +961,7 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
return &sdmac->desc;
err_out:
sdmac->status = DMA_ERROR;
return NULL;
}
@ -963,7 +972,7 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct sdma_engine *sdma = sdmac->sdma;
int num_periods = buf_len / period_len;
int channel = chan->chan_id;
int channel = sdmac->channel;
int ret, i = 0, buf = 0;
dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel);
@ -1066,14 +1075,12 @@ static enum dma_status sdma_tx_status(struct dma_chan *chan,
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
dma_cookie_t last_used;
enum dma_status ret;
last_used = chan->cookie;
ret = dma_async_is_complete(cookie, sdmac->last_completed, last_used);
dma_set_tx_state(txstate, sdmac->last_completed, last_used, 0);
return ret;
return sdmac->status;
}
static void sdma_issue_pending(struct dma_chan *chan)
@ -1135,7 +1142,7 @@ static int __init sdma_get_firmware(struct sdma_engine *sdma,
/* download the RAM image for SDMA */
sdma_load_script(sdma, ram_code,
header->ram_code_size,
sdma->script_addrs->ram_code_start_addr);
addr->ram_code_start_addr);
clk_disable(sdma->clk);
sdma_add_scripts(sdma, addr);
@ -1237,7 +1244,6 @@ static int __init sdma_probe(struct platform_device *pdev)
struct resource *iores;
struct sdma_platform_data *pdata = pdev->dev.platform_data;
int i;
dma_cap_mask_t mask;
struct sdma_engine *sdma;
sdma = kzalloc(sizeof(*sdma), GFP_KERNEL);
@ -1280,6 +1286,9 @@ static int __init sdma_probe(struct platform_device *pdev)
sdma->version = pdata->sdma_version;
dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);
INIT_LIST_HEAD(&sdma->dma_device.channels);
/* Initialize channel parameters */
for (i = 0; i < MAX_DMA_CHANNELS; i++) {
@ -1288,15 +1297,17 @@ static int __init sdma_probe(struct platform_device *pdev)
sdmac->sdma = sdma;
spin_lock_init(&sdmac->lock);
dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);
sdmac->chan.device = &sdma->dma_device;
sdmac->chan.chan_id = i;
sdmac->channel = i;
/* Add the channel to the DMAC list */
list_add_tail(&sdmac->chan.device_node, &sdma->dma_device.channels);
/*
* Add the channel to the DMAC list. Do not add channel 0 though
* because we need it internally in the SDMA driver. This also means
* that channel 0 in dmaengine counting matches sdma channel 1.
*/
if (i)
list_add_tail(&sdmac->chan.device_node,
&sdma->dma_device.channels);
}
ret = sdma_init(sdma);
@ -1317,6 +1328,8 @@ static int __init sdma_probe(struct platform_device *pdev)
sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic;
sdma->dma_device.device_control = sdma_control;
sdma->dma_device.device_issue_pending = sdma_issue_pending;
sdma->dma_device.dev->dma_parms = &sdma->dma_parms;
dma_set_max_seg_size(sdma->dma_device.dev, 65535);
ret = dma_async_device_register(&sdma->dma_device);
if (ret) {
@ -1324,13 +1337,6 @@ static int __init sdma_probe(struct platform_device *pdev)
goto err_init;
}
/* request channel 0. This is an internal control channel
* to the SDMA engine and not available to clients.
*/
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
dma_request_channel(mask, NULL, NULL);
dev_info(sdma->dev, "initialized\n");
return 0;
@ -1348,7 +1354,7 @@ err_clk:
err_request_region:
err_irq:
kfree(sdma);
return 0;
return ret;
}
static int __exit sdma_remove(struct platform_device *pdev)

50
drivers/dma/ipu/ipu_idmac.c
View file

@ -1145,29 +1145,6 @@ static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
idmac_write_icreg(ipu, reg & ~chan_mask, IDMAC_CHA_EN);
/*
* Problem (observed with channel DMAIC_7): after enabling the channel
* and initialising buffers, there comes an interrupt with current still
* pointing at buffer 0, whereas it should use buffer 0 first and only
* generate an interrupt when it is done, then current should already
* point to buffer 1. This spurious interrupt also comes on channel
* DMASDC_0. With DMAIC_7 normally, is we just leave the ISR after the
* first interrupt, there comes the second with current correctly
* pointing to buffer 1 this time. But sometimes this second interrupt
* doesn't come and the channel hangs. Clearing BUFx_RDY when disabling
* the channel seems to prevent the channel from hanging, but it doesn't
* prevent the spurious interrupt. This might also be unsafe. Think
* about the IDMAC controller trying to switch to a buffer, when we
* clear the ready bit, and re-enable it a moment later.
*/
reg = idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY);
idmac_write_ipureg(ipu, 0, IPU_CHA_BUF0_RDY);
idmac_write_ipureg(ipu, reg & ~(1UL << channel), IPU_CHA_BUF0_RDY);
reg = idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY);
idmac_write_ipureg(ipu, 0, IPU_CHA_BUF1_RDY);
idmac_write_ipureg(ipu, reg & ~(1UL << channel), IPU_CHA_BUF1_RDY);
spin_unlock_irqrestore(&ipu->lock, flags);
return 0;
@ -1246,33 +1223,6 @@ static irqreturn_t idmac_interrupt(int irq, void *dev_id)
/* Other interrupts do not interfere with this channel */
spin_lock(&ichan->lock);
if (unlikely(chan_id != IDMAC_SDC_0 && chan_id != IDMAC_SDC_1 &&
((curbuf >> chan_id) & 1) == ichan->active_buffer &&
!list_is_last(ichan->queue.next, &ichan->queue))) {
int i = 100;
/* This doesn't help. See comment in ipu_disable_channel() */
while (--i) {
curbuf = idmac_read_ipureg(&ipu_data, IPU_CHA_CUR_BUF);
if (((curbuf >> chan_id) & 1) != ichan->active_buffer)
break;
cpu_relax();
}
if (!i) {
spin_unlock(&ichan->lock);
dev_dbg(dev,
"IRQ on active buffer on channel %x, active "
"%d, ready %x, %x, current %x!\n", chan_id,
ichan->active_buffer, ready0, ready1, curbuf);
return IRQ_NONE;
} else
dev_dbg(dev,
"Buffer deactivated on channel %x, active "
"%d, ready %x, %x, current %x, rest %d!\n", chan_id,
ichan->active_buffer, ready0, ready1, curbuf, i);
}
if (unlikely((ichan->active_buffer && (ready1 >> chan_id) & 1) ||
(!ichan->active_buffer && (ready0 >> chan_id) & 1)
)) {