redonkable/alistair23-linux
redonkable/alistair23-linux
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Merge branch 'topic/omap' into for-linus

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This commit is contained in:
Vinod Koul 2016-12-14 09:06:30 +05:30
parent 3f809e844c 08c824e87e
commit db82df3e81
3 changed files with 161 additions and 37 deletions
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3
drivers/dma/edma.c
View file

@ -2450,6 +2450,9 @@ static int edma_pm_resume(struct device *dev)
int i;
s8 (*queue_priority_mapping)[2];
/* re initialize dummy slot to dummy param set */
edma_write_slot(ecc, ecc->dummy_slot, &dummy_paramset);
queue_priority_mapping = ecc->info->queue_priority_mapping;
/* Event queue priority mapping */

187
drivers/dma/omap-dma.c
View file

@ -166,6 +166,9 @@ enum {
CSDP_DST_BURST_16 = 1 << 14,
CSDP_DST_BURST_32 = 2 << 14,
CSDP_DST_BURST_64 = 3 << 14,
CSDP_WRITE_NON_POSTED = 0 << 16,
CSDP_WRITE_POSTED = 1 << 16,
CSDP_WRITE_LAST_NON_POSTED = 2 << 16,
CICR_TOUT_IE = BIT(0), /* OMAP1 only */
CICR_DROP_IE = BIT(1),
@ -422,7 +425,30 @@ static void omap_dma_start(struct omap_chan *c, struct omap_desc *d)
c->running = true;
}
static void omap_dma_stop(struct omap_chan *c)
static void omap_dma_drain_chan(struct omap_chan *c)
{
int i;
u32 val;
/* Wait for sDMA FIFO to drain */
for (i = 0; ; i++) {
val = omap_dma_chan_read(c, CCR);
if (!(val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE)))
break;
if (i > 100)
break;
udelay(5);
}
if (val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE))
dev_err(c->vc.chan.device->dev,
"DMA drain did not complete on lch %d\n",
c->dma_ch);
}
static int omap_dma_stop(struct omap_chan *c)
{
struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
uint32_t val;
@ -435,7 +461,6 @@ static void omap_dma_stop(struct omap_chan *c)
val = omap_dma_chan_read(c, CCR);
if (od->plat->errata & DMA_ERRATA_i541 && val & CCR_TRIGGER_SRC) {
uint32_t sysconfig;
unsigned i;
sysconfig = omap_dma_glbl_read(od, OCP_SYSCONFIG);
val = sysconfig & ~DMA_SYSCONFIG_MIDLEMODE_MASK;
@ -446,27 +471,19 @@ static void omap_dma_stop(struct omap_chan *c)
val &= ~CCR_ENABLE;
omap_dma_chan_write(c, CCR, val);
/* Wait for sDMA FIFO to drain */
for (i = 0; ; i++) {
val = omap_dma_chan_read(c, CCR);
if (!(val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE)))
break;
if (i > 100)
break;
udelay(5);
}
if (val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE))
dev_err(c->vc.chan.device->dev,
"DMA drain did not complete on lch %d\n",
c->dma_ch);
if (!(c->ccr & CCR_BUFFERING_DISABLE))
omap_dma_drain_chan(c);
omap_dma_glbl_write(od, OCP_SYSCONFIG, sysconfig);
} else {
if (!(val & CCR_ENABLE))
return -EINVAL;
val &= ~CCR_ENABLE;
omap_dma_chan_write(c, CCR, val);
if (!(c->ccr & CCR_BUFFERING_DISABLE))
omap_dma_drain_chan(c);
}
mb();
@ -481,8 +498,8 @@ static void omap_dma_stop(struct omap_chan *c)
omap_dma_chan_write(c, CLNK_CTRL, val);
}
c->running = false;
return 0;
}
static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d)
@ -836,6 +853,8 @@ static enum dma_status omap_dma_tx_status(struct dma_chan *chan,
} else {
txstate->residue = 0;
}
if (ret == DMA_IN_PROGRESS && c->paused)
ret = DMA_PAUSED;
spin_unlock_irqrestore(&c->vc.lock, flags);
return ret;
@ -865,15 +884,18 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
unsigned i, es, en, frame_bytes;
bool ll_failed = false;
u32 burst;
u32 port_window, port_window_bytes;
if (dir == DMA_DEV_TO_MEM) {
dev_addr = c->cfg.src_addr;
dev_width = c->cfg.src_addr_width;
burst = c->cfg.src_maxburst;
port_window = c->cfg.src_port_window_size;
} else if (dir == DMA_MEM_TO_DEV) {
dev_addr = c->cfg.dst_addr;
dev_width = c->cfg.dst_addr_width;
burst = c->cfg.dst_maxburst;
port_window = c->cfg.dst_port_window_size;
} else {
dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
return NULL;
@ -894,6 +916,12 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
return NULL;
}
/* When the port_window is used, one frame must cover the window */
if (port_window) {
burst = port_window;
port_window_bytes = port_window * es_bytes[es];
}
/* Now allocate and setup the descriptor. */
d = kzalloc(sizeof(*d) + sglen * sizeof(d->sg[0]), GFP_ATOMIC);
if (!d)
@ -905,11 +933,45 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
d->ccr = c->ccr | CCR_SYNC_FRAME;
if (dir == DMA_DEV_TO_MEM) {
d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT;
d->csdp = CSDP_DST_BURST_64 | CSDP_DST_PACKED;
d->ccr |= CCR_DST_AMODE_POSTINC;
if (port_window) {
d->ccr |= CCR_SRC_AMODE_DBLIDX;
d->ei = 1;
/*
* One frame covers the port_window and by configure
* the source frame index to be -1 * (port_window - 1)
* we instruct the sDMA that after a frame is processed
* it should move back to the start of the window.
*/
d->fi = -(port_window_bytes - 1);
if (port_window_bytes >= 64)
d->csdp = CSDP_SRC_BURST_64 | CSDP_SRC_PACKED;
else if (port_window_bytes >= 32)
d->csdp = CSDP_SRC_BURST_32 | CSDP_SRC_PACKED;
else if (port_window_bytes >= 16)
d->csdp = CSDP_SRC_BURST_16 | CSDP_SRC_PACKED;
} else {
d->ccr |= CCR_SRC_AMODE_CONSTANT;
}
} else {
d->ccr |= CCR_DST_AMODE_CONSTANT | CCR_SRC_AMODE_POSTINC;
d->csdp = CSDP_SRC_BURST_64 | CSDP_SRC_PACKED;
d->ccr |= CCR_SRC_AMODE_POSTINC;
if (port_window) {
d->ccr |= CCR_DST_AMODE_DBLIDX;
if (port_window_bytes >= 64)
d->csdp = CSDP_DST_BURST_64 | CSDP_DST_PACKED;
else if (port_window_bytes >= 32)
d->csdp = CSDP_DST_BURST_32 | CSDP_DST_PACKED;
else if (port_window_bytes >= 16)
d->csdp = CSDP_DST_BURST_16 | CSDP_DST_PACKED;
} else {
d->ccr |= CCR_DST_AMODE_CONSTANT;
}
}
d->cicr = CICR_DROP_IE | CICR_BLOCK_IE;
@ -927,6 +989,9 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
d->ccr |= CCR_TRIGGER_SRC;
d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
if (port_window)
d->csdp |= CSDP_WRITE_LAST_NON_POSTED;
}
if (od->plat->errata & DMA_ERRATA_PARALLEL_CHANNELS)
d->clnk_ctrl = c->dma_ch;
@ -952,6 +1017,16 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
osg->addr = sg_dma_address(sgent);
osg->en = en;
osg->fn = sg_dma_len(sgent) / frame_bytes;
if (port_window && dir == DMA_MEM_TO_DEV) {
osg->ei = 1;
/*
* One frame covers the port_window and by configure
* the source frame index to be -1 * (port_window - 1)
* we instruct the sDMA that after a frame is processed
* it should move back to the start of the window.
*/
osg->fi = -(port_window_bytes - 1);
}
if (d->using_ll) {
osg->t2_desc = dma_pool_alloc(od->desc_pool, GFP_ATOMIC,
@ -1247,10 +1322,8 @@ static int omap_dma_terminate_all(struct dma_chan *chan)
omap_dma_stop(c);
}
if (c->cyclic) {
c->cyclic = false;
c->paused = false;
}
c->cyclic = false;
c->paused = false;
vchan_get_all_descriptors(&c->vc, &head);
spin_unlock_irqrestore(&c->vc.lock, flags);
@ -1269,28 +1342,66 @@ static void omap_dma_synchronize(struct dma_chan *chan)
static int omap_dma_pause(struct dma_chan *chan)
{
struct omap_chan *c = to_omap_dma_chan(chan);
struct omap_dmadev *od = to_omap_dma_dev(chan->device);
unsigned long flags;
int ret = -EINVAL;
bool can_pause = false;
/* Pause/Resume only allowed with cyclic mode */
if (!c->cyclic)
return -EINVAL;
spin_lock_irqsave(&od->irq_lock, flags);
if (!c->paused) {
omap_dma_stop(c);
c->paused = true;
if (!c->desc)
goto out;
if (c->cyclic)
can_pause = true;
/*
* We do not allow DMA_MEM_TO_DEV transfers to be paused.
* From the AM572x TRM, 16.1.4.18 Disabling a Channel During Transfer:
* "When a channel is disabled during a transfer, the channel undergoes
* an abort, unless it is hardware-source-synchronized …".
* A source-synchronised channel is one where the fetching of data is
* under control of the device. In other words, a device-to-memory
* transfer. So, a destination-synchronised channel (which would be a
* memory-to-device transfer) undergoes an abort if the the CCR_ENABLE
* bit is cleared.
* From 16.1.4.20.4.6.2 Abort: "If an abort trigger occurs, the channel
* aborts immediately after completion of current read/write
* transactions and then the FIFO is cleaned up." The term "cleaned up"
* is not defined. TI recommends to check that RD_ACTIVE and WR_ACTIVE
* are both clear _before_ disabling the channel, otherwise data loss
* will occur.
* The problem is that if the channel is active, then device activity
* can result in DMA activity starting between reading those as both
* clear and the write to DMA_CCR to clear the enable bit hitting the
* hardware. If the DMA hardware can't drain the data in its FIFO to the
* destination, then data loss "might" occur (say if we write to an UART
* and the UART is not accepting any further data).
*/
else if (c->desc->dir == DMA_DEV_TO_MEM)
can_pause = true;
if (can_pause && !c->paused) {
ret = omap_dma_stop(c);
if (!ret)
c->paused = true;
}
out:
spin_unlock_irqrestore(&od->irq_lock, flags);
return 0;
return ret;
}
static int omap_dma_resume(struct dma_chan *chan)
{
struct omap_chan *c = to_omap_dma_chan(chan);
struct omap_dmadev *od = to_omap_dma_dev(chan->device);
unsigned long flags;
int ret = -EINVAL;
/* Pause/Resume only allowed with cyclic mode */
if (!c->cyclic)
return -EINVAL;
spin_lock_irqsave(&od->irq_lock, flags);
if (c->paused) {
if (c->paused && c->desc) {
mb();
/* Restore channel link register */
@ -1298,9 +1409,11 @@ static int omap_dma_resume(struct dma_chan *chan)
omap_dma_start(c, c->desc);
c->paused = false;
ret = 0;
}
spin_unlock_irqrestore(&od->irq_lock, flags);
return 0;
return ret;
}
static int omap_dma_chan_init(struct omap_dmadev *od)

8
include/linux/dmaengine.h
View file

@ -336,6 +336,12 @@ enum dma_slave_buswidth {
* may or may not be applicable on memory sources.
* @dst_maxburst: same as src_maxburst but for destination target
* mutatis mutandis.
* @src_port_window_size: The length of the register area in words the data need
* to be accessed on the device side. It is only used for devices which is using
* an area instead of a single register to receive the data. Typically the DMA
* loops in this area in order to transfer the data.
* @dst_port_window_size: same as src_port_window_size but for the destination
* port.
* @device_fc: Flow Controller Settings. Only valid for slave channels. Fill
* with 'true' if peripheral should be flow controller. Direction will be
* selected at Runtime.
@ -363,6 +369,8 @@ struct dma_slave_config {
enum dma_slave_buswidth dst_addr_width;
u32 src_maxburst;
u32 dst_maxburst;
u32 src_port_window_size;
u32 dst_port_window_size;
bool device_fc;
unsigned int slave_id;
};