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Merge branch 'topic/xdmac' into for-linus

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This commit is contained in:
Vinod Koul 2015-06-25 09:21:49 +05:30
commit 4fb9c15b4f
4 changed files with 391 additions and 52 deletions
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106
drivers/dma/at_hdmac.c
View File

@ -247,6 +247,10 @@ static void atc_dostart(struct at_dma_chan *atchan, struct at_desc *first)
channel_writel(atchan, CTRLA, 0);
channel_writel(atchan, CTRLB, 0);
channel_writel(atchan, DSCR, first->txd.phys);
channel_writel(atchan, SPIP, ATC_SPIP_HOLE(first->src_hole) |
ATC_SPIP_BOUNDARY(first->boundary));
channel_writel(atchan, DPIP, ATC_DPIP_HOLE(first->dst_hole) |
ATC_DPIP_BOUNDARY(first->boundary));
dma_writel(atdma, CHER, atchan->mask);
vdbg_dump_regs(atchan);
@ -634,6 +638,104 @@ static dma_cookie_t atc_tx_submit(struct dma_async_tx_descriptor *tx)
return cookie;
}
/**
* atc_prep_dma_interleaved - prepare memory to memory interleaved operation
* @chan: the channel to prepare operation on
* @xt: Interleaved transfer template
* @flags: tx descriptor status flags
*/
static struct dma_async_tx_descriptor *
atc_prep_dma_interleaved(struct dma_chan *chan,
struct dma_interleaved_template *xt,
unsigned long flags)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct data_chunk *first = xt->sgl;
struct at_desc *desc = NULL;
size_t xfer_count;
unsigned int dwidth;
u32 ctrla;
u32 ctrlb;
size_t len = 0;
int i;
dev_info(chan2dev(chan),
"%s: src=0x%08x, dest=0x%08x, numf=%d, frame_size=%d, flags=0x%lx\n",
__func__, xt->src_start, xt->dst_start, xt->numf,
xt->frame_size, flags);
if (unlikely(!xt || xt->numf != 1 || !xt->frame_size))
return NULL;
/*
* The controller can only "skip" X bytes every Y bytes, so we
* need to make sure we are given a template that fit that
* description, ie a template with chunks that always have the
* same size, with the same ICGs.
*/
for (i = 0; i < xt->frame_size; i++) {
struct data_chunk *chunk = xt->sgl + i;
if ((chunk->size != xt->sgl->size) ||
(dmaengine_get_dst_icg(xt, chunk) != dmaengine_get_dst_icg(xt, first)) ||
(dmaengine_get_src_icg(xt, chunk) != dmaengine_get_src_icg(xt, first))) {
dev_err(chan2dev(chan),
"%s: the controller can transfer only identical chunks\n",
__func__);
return NULL;
}
len += chunk->size;
}
dwidth = atc_get_xfer_width(xt->src_start,
xt->dst_start, len);
xfer_count = len >> dwidth;
if (xfer_count > ATC_BTSIZE_MAX) {
dev_err(chan2dev(chan), "%s: buffer is too big\n", __func__);
return NULL;
}
ctrla = ATC_SRC_WIDTH(dwidth) |
ATC_DST_WIDTH(dwidth);
ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN
| ATC_SRC_ADDR_MODE_INCR
| ATC_DST_ADDR_MODE_INCR
| ATC_SRC_PIP
| ATC_DST_PIP
| ATC_FC_MEM2MEM;
/* create the transfer */
desc = atc_desc_get(atchan);
if (!desc) {
dev_err(chan2dev(chan),
"%s: couldn't allocate our descriptor\n", __func__);
return NULL;
}
desc->lli.saddr = xt->src_start;
desc->lli.daddr = xt->dst_start;
desc->lli.ctrla = ctrla | xfer_count;
desc->lli.ctrlb = ctrlb;
desc->boundary = first->size >> dwidth;
desc->dst_hole = (dmaengine_get_dst_icg(xt, first) >> dwidth) + 1;
desc->src_hole = (dmaengine_get_src_icg(xt, first) >> dwidth) + 1;
desc->txd.cookie = -EBUSY;
desc->total_len = desc->len = len;
desc->tx_width = dwidth;
/* set end-of-link to the last link descriptor of list*/
set_desc_eol(desc);
desc->txd.flags = flags; /* client is in control of this ack */
return &desc->txd;
}
/**
* atc_prep_dma_memcpy - prepare a memcpy operation
* @chan: the channel to prepare operation on
@ -1609,6 +1711,7 @@ static int __init at_dma_probe(struct platform_device *pdev)
/* setup platform data for each SoC */
dma_cap_set(DMA_MEMCPY, at91sam9rl_config.cap_mask);
dma_cap_set(DMA_SG, at91sam9rl_config.cap_mask);
dma_cap_set(DMA_INTERLEAVE, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_MEMCPY, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_SLAVE, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_SG, at91sam9g45_config.cap_mask);
@ -1713,6 +1816,9 @@ static int __init at_dma_probe(struct platform_device *pdev)
atdma->dma_common.dev = &pdev->dev;
/* set prep routines based on capability */
if (dma_has_cap(DMA_INTERLEAVE, atdma->dma_common.cap_mask))
atdma->dma_common.device_prep_interleaved_dma = atc_prep_dma_interleaved;
if (dma_has_cap(DMA_MEMCPY, atdma->dma_common.cap_mask))
atdma->dma_common.device_prep_dma_memcpy = atc_prep_dma_memcpy;

5
drivers/dma/at_hdmac_regs.h
View File

@ -196,6 +196,11 @@ struct at_desc {
size_t len;
u32 tx_width;
size_t total_len;
/* Interleaved data */
size_t boundary;
size_t dst_hole;
size_t src_hole;
};
static inline struct at_desc *

305
drivers/dma/at_xdmac.c
View File

@ -236,6 +236,10 @@ struct at_xdmac_lld {
dma_addr_t mbr_sa; /* Source Address Member */
dma_addr_t mbr_da; /* Destination Address Member */
u32 mbr_cfg; /* Configuration Register */
u32 mbr_bc; /* Block Control Register */
u32 mbr_ds; /* Data Stride Register */
u32 mbr_sus; /* Source Microblock Stride Register */
u32 mbr_dus; /* Destination Microblock Stride Register */
};
@ -359,6 +363,8 @@ static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan,
if (at_xdmac_chan_is_cyclic(atchan)) {
reg = AT_XDMAC_CNDC_NDVIEW_NDV1;
at_xdmac_chan_write(atchan, AT_XDMAC_CC, first->lld.mbr_cfg);
} else if (first->lld.mbr_ubc & AT_XDMAC_MBR_UBC_NDV3) {
reg = AT_XDMAC_CNDC_NDVIEW_NDV3;
} else {
/*
* No need to write AT_XDMAC_CC reg, it will be done when the
@ -465,6 +471,33 @@ static struct at_xdmac_desc *at_xdmac_get_desc(struct at_xdmac_chan *atchan)
return desc;
}
static void at_xdmac_queue_desc(struct dma_chan *chan,
struct at_xdmac_desc *prev,
struct at_xdmac_desc *desc)
{
if (!prev || !desc)
return;
prev->lld.mbr_nda = desc->tx_dma_desc.phys;
prev->lld.mbr_ubc |= AT_XDMAC_MBR_UBC_NDE;
dev_dbg(chan2dev(chan), "%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
__func__, prev, &prev->lld.mbr_nda);
}
static inline void at_xdmac_increment_block_count(struct dma_chan *chan,
struct at_xdmac_desc *desc)
{
if (!desc)
return;
desc->lld.mbr_bc++;
dev_dbg(chan2dev(chan),
"%s: incrementing the block count of the desc 0x%p\n",
__func__, desc);
}
static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec,
struct of_dma *of_dma)
{
@ -621,19 +654,14 @@ at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 /* next descriptor view */
| AT_XDMAC_MBR_UBC_NDEN /* next descriptor dst parameter update */
| AT_XDMAC_MBR_UBC_NSEN /* next descriptor src parameter update */
| (i == sg_len - 1 ? 0 : AT_XDMAC_MBR_UBC_NDE) /* descriptor fetch */
| (len >> fixed_dwidth); /* microblock length */
dev_dbg(chan2dev(chan),
"%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n",
__func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc);
/* Chain lld. */
if (prev) {
prev->lld.mbr_nda = desc->tx_dma_desc.phys;
dev_dbg(chan2dev(chan),
"%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
__func__, prev, &prev->lld.mbr_nda);
}
if (prev)
at_xdmac_queue_desc(chan, prev, desc);
prev = desc;
if (!first)
@ -708,7 +736,6 @@ at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1
| AT_XDMAC_MBR_UBC_NDEN
| AT_XDMAC_MBR_UBC_NSEN
| AT_XDMAC_MBR_UBC_NDE
| period_len >> at_xdmac_get_dwidth(desc->lld.mbr_cfg);
dev_dbg(chan2dev(chan),
@ -716,12 +743,8 @@ at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
__func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc);
/* Chain lld. */
if (prev) {
prev->lld.mbr_nda = desc->tx_dma_desc.phys;
dev_dbg(chan2dev(chan),
"%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
__func__, prev, &prev->lld.mbr_nda);
}
if (prev)
at_xdmac_queue_desc(chan, prev, desc);
prev = desc;
if (!first)
@ -743,6 +766,215 @@ at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
return &first->tx_dma_desc;
}
static inline u32 at_xdmac_align_width(struct dma_chan *chan, dma_addr_t addr)
{
u32 width;
/*
* Check address alignment to select the greater data width we
* can use.
*
* Some XDMAC implementations don't provide dword transfer, in
* this case selecting dword has the same behavior as
* selecting word transfers.
*/
if (!(addr & 7)) {
width = AT_XDMAC_CC_DWIDTH_DWORD;
dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__);
} else if (!(addr & 3)) {
width = AT_XDMAC_CC_DWIDTH_WORD;
dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__);
} else if (!(addr & 1)) {
width = AT_XDMAC_CC_DWIDTH_HALFWORD;
dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__);
} else {
width = AT_XDMAC_CC_DWIDTH_BYTE;
dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__);
}
return width;
}
static struct at_xdmac_desc *
at_xdmac_interleaved_queue_desc(struct dma_chan *chan,
struct at_xdmac_chan *atchan,
struct at_xdmac_desc *prev,
dma_addr_t src, dma_addr_t dst,
struct dma_interleaved_template *xt,
struct data_chunk *chunk)
{
struct at_xdmac_desc *desc;
u32 dwidth;
unsigned long flags;
size_t ublen;
/*
* WARNING: The channel configuration is set here since there is no
* dmaengine_slave_config call in this case. Moreover we don't know the
* direction, it involves we can't dynamically set the source and dest
* interface so we have to use the same one. Only interface 0 allows EBI
* access. Hopefully we can access DDR through both ports (at least on
* SAMA5D4x), so we can use the same interface for source and dest,
* that solves the fact we don't know the direction.
*/
u32 chan_cc = AT_XDMAC_CC_DIF(0)
| AT_XDMAC_CC_SIF(0)
| AT_XDMAC_CC_MBSIZE_SIXTEEN
| AT_XDMAC_CC_TYPE_MEM_TRAN;
dwidth = at_xdmac_align_width(chan, src | dst | chunk->size);
if (chunk->size >= (AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)) {
dev_dbg(chan2dev(chan),
"%s: chunk too big (%d, max size %lu)...\n",
__func__, chunk->size,
AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth);
return NULL;
}
if (prev)
dev_dbg(chan2dev(chan),
"Adding items at the end of desc 0x%p\n", prev);
if (xt->src_inc) {
if (xt->src_sgl)
chan_cc |= AT_XDMAC_CC_SAM_UBS_DS_AM;
else
chan_cc |= AT_XDMAC_CC_SAM_INCREMENTED_AM;
}
if (xt->dst_inc) {
if (xt->dst_sgl)
chan_cc |= AT_XDMAC_CC_DAM_UBS_DS_AM;
else
chan_cc |= AT_XDMAC_CC_DAM_INCREMENTED_AM;
}
spin_lock_irqsave(&atchan->lock, flags);
desc = at_xdmac_get_desc(atchan);
spin_unlock_irqrestore(&atchan->lock, flags);
if (!desc) {
dev_err(chan2dev(chan), "can't get descriptor\n");
return NULL;
}
chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
ublen = chunk->size >> dwidth;
desc->lld.mbr_sa = src;
desc->lld.mbr_da = dst;
desc->lld.mbr_sus = dmaengine_get_src_icg(xt, chunk);
desc->lld.mbr_dus = dmaengine_get_dst_icg(xt, chunk);
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV3
| AT_XDMAC_MBR_UBC_NDEN
| AT_XDMAC_MBR_UBC_NSEN
| ublen;
desc->lld.mbr_cfg = chan_cc;
dev_dbg(chan2dev(chan),
"%s: lld: mbr_sa=0x%08x, mbr_da=0x%08x, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
__func__, desc->lld.mbr_sa, desc->lld.mbr_da,
desc->lld.mbr_ubc, desc->lld.mbr_cfg);
/* Chain lld. */
if (prev)
at_xdmac_queue_desc(chan, prev, desc);
return desc;
}
static struct dma_async_tx_descriptor *
at_xdmac_prep_interleaved(struct dma_chan *chan,
struct dma_interleaved_template *xt,
unsigned long flags)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *prev = NULL, *first = NULL;
struct data_chunk *chunk, *prev_chunk = NULL;
dma_addr_t dst_addr, src_addr;
size_t dst_skip, src_skip, len = 0;
size_t prev_dst_icg = 0, prev_src_icg = 0;
int i;
if (!xt || (xt->numf != 1) || (xt->dir != DMA_MEM_TO_MEM))
return NULL;
dev_dbg(chan2dev(chan), "%s: src=0x%08x, dest=0x%08x, numf=%d, frame_size=%d, flags=0x%lx\n",
__func__, xt->src_start, xt->dst_start, xt->numf,
xt->frame_size, flags);
src_addr = xt->src_start;
dst_addr = xt->dst_start;
for (i = 0; i < xt->frame_size; i++) {
struct at_xdmac_desc *desc;
size_t src_icg, dst_icg;
chunk = xt->sgl + i;
dst_icg = dmaengine_get_dst_icg(xt, chunk);
src_icg = dmaengine_get_src_icg(xt, chunk);
src_skip = chunk->size + src_icg;
dst_skip = chunk->size + dst_icg;
dev_dbg(chan2dev(chan),
"%s: chunk size=%d, src icg=%d, dst icg=%d\n",
__func__, chunk->size, src_icg, dst_icg);
/*
* Handle the case where we just have the same
* transfer to setup, we can just increase the
* block number and reuse the same descriptor.
*/
if (prev_chunk && prev &&
(prev_chunk->size == chunk->size) &&
(prev_src_icg == src_icg) &&
(prev_dst_icg == dst_icg)) {
dev_dbg(chan2dev(chan),
"%s: same configuration that the previous chunk, merging the descriptors...\n",
__func__);
at_xdmac_increment_block_count(chan, prev);
continue;
}
desc = at_xdmac_interleaved_queue_desc(chan, atchan,
prev,
src_addr, dst_addr,
xt, chunk);
if (!desc) {
list_splice_init(&first->descs_list,
&atchan->free_descs_list);
return NULL;
}
if (!first)
first = desc;
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
__func__, desc, first);
list_add_tail(&desc->desc_node, &first->descs_list);
if (xt->src_sgl)
src_addr += src_skip;
if (xt->dst_sgl)
dst_addr += dst_skip;
len += chunk->size;
prev_chunk = chunk;
prev_dst_icg = dst_icg;
prev_src_icg = src_icg;
prev = desc;
}
first->tx_dma_desc.cookie = -EBUSY;
first->tx_dma_desc.flags = flags;
first->xfer_size = len;
return &first->tx_dma_desc;
}
static struct dma_async_tx_descriptor *
at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
@ -773,24 +1005,7 @@ at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
if (unlikely(!len))
return NULL;
/*
* Check address alignment to select the greater data width we can use.
* Some XDMAC implementations don't provide dword transfer, in this
* case selecting dword has the same behavior as selecting word transfers.
*/
if (!((src_addr | dst_addr) & 7)) {
dwidth = AT_XDMAC_CC_DWIDTH_DWORD;
dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__);
} else if (!((src_addr | dst_addr) & 3)) {
dwidth = AT_XDMAC_CC_DWIDTH_WORD;
dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__);
} else if (!((src_addr | dst_addr) & 1)) {
dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD;
dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__);
} else {
dwidth = AT_XDMAC_CC_DWIDTH_BYTE;
dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__);
}
dwidth = at_xdmac_align_width(chan, src_addr | dst_addr);
/* Prepare descriptors. */
while (remaining_size) {
@ -820,19 +1035,8 @@ at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
dev_dbg(chan2dev(chan), "%s: xfer_size=%zu\n", __func__, xfer_size);
/* Check remaining length and change data width if needed. */
if (!((src_addr | dst_addr | xfer_size) & 7)) {
dwidth = AT_XDMAC_CC_DWIDTH_DWORD;
dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__);
} else if (!((src_addr | dst_addr | xfer_size) & 3)) {
dwidth = AT_XDMAC_CC_DWIDTH_WORD;
dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__);
} else if (!((src_addr | dst_addr | xfer_size) & 1)) {
dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD;
dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__);
} else if ((src_addr | dst_addr | xfer_size) & 1) {
dwidth = AT_XDMAC_CC_DWIDTH_BYTE;
dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__);
}
dwidth = at_xdmac_align_width(chan,
src_addr | dst_addr | xfer_size);
chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
ublen = xfer_size >> dwidth;
@ -843,7 +1047,6 @@ at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2
| AT_XDMAC_MBR_UBC_NDEN
| AT_XDMAC_MBR_UBC_NSEN
| (remaining_size ? AT_XDMAC_MBR_UBC_NDE : 0)
| ublen;
desc->lld.mbr_cfg = chan_cc;
@ -852,12 +1055,8 @@ at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
__func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc, desc->lld.mbr_cfg);
/* Chain lld. */
if (prev) {
prev->lld.mbr_nda = desc->tx_dma_desc.phys;
dev_dbg(chan2dev(chan),
"%s: chain lld: prev=0x%p, mbr_nda=0x%08x\n",
__func__, prev, prev->lld.mbr_nda);
}
if (prev)
at_xdmac_queue_desc(chan, prev, desc);
prev = desc;
if (!first)
@ -1398,6 +1597,7 @@ static int at_xdmac_probe(struct platform_device *pdev)
}
dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask);
dma_cap_set(DMA_INTERLEAVE, atxdmac->dma.cap_mask);
dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask);
dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask);
/*
@ -1411,6 +1611,7 @@ static int at_xdmac_probe(struct platform_device *pdev)
atxdmac->dma.device_tx_status = at_xdmac_tx_status;
atxdmac->dma.device_issue_pending = at_xdmac_issue_pending;
atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic;
atxdmac->dma.device_prep_interleaved_dma = at_xdmac_prep_interleaved;
atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy;
atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg;
atxdmac->dma.device_config = at_xdmac_device_config;

27
include/linux/dmaengine.h
View File

@ -923,6 +923,33 @@ static inline int dma_maxpq(struct dma_device *dma, enum dma_ctrl_flags flags)
BUG();
}
static inline size_t dmaengine_get_icg(bool inc, bool sgl, size_t icg,
size_t dir_icg)
{
if (inc) {
if (dir_icg)
return dir_icg;
else if (sgl)
return icg;
}
return 0;
}
static inline size_t dmaengine_get_dst_icg(struct dma_interleaved_template *xt,
struct data_chunk *chunk)
{
return dmaengine_get_icg(xt->dst_inc, xt->dst_sgl,
chunk->icg, chunk->dst_icg);
}
static inline size_t dmaengine_get_src_icg(struct dma_interleaved_template *xt,
struct data_chunk *chunk)
{
return dmaengine_get_icg(xt->src_inc, xt->src_sgl,
chunk->icg, chunk->src_icg);
}
/* --- public DMA engine API --- */
#ifdef CONFIG_DMA_ENGINE