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dmaengine: hdmac: Add memset capabilities 

Just like for the XDMAC, the SoCs that embed the HDMAC don't have any kind
of GPU, and need to accelerate a few framebuffer-related operations through
their DMA controller.

However, unlike the XDMAC, the HDMAC doesn't have the memset capability
built-in. That can be easily emulated though, by doing a transfer with a
fixed address on the variable that holds the value we want to set.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Maxime Ripard 2015-08-24 11:21:15 +02:00 committed by Vinod Koul
parent 8a4ce226b9
commit 4d112426c3
2 changed files with 124 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

121
drivers/dma/at_hdmac.c
View File

@ -390,6 +390,7 @@ static void
atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
{
struct dma_async_tx_descriptor *txd = &desc->txd;
struct at_dma *atdma = to_at_dma(atchan->chan_common.device);
dev_vdbg(chan2dev(&atchan->chan_common),
"descriptor %u complete\n", txd->cookie);
@ -398,6 +399,13 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
if (!atc_chan_is_cyclic(atchan))
dma_cookie_complete(txd);
/* If the transfer was a memset, free our temporary buffer */
if (desc->memset) {
dma_pool_free(atdma->memset_pool, desc->memset_vaddr,
desc->memset_paddr);
desc->memset = false;
}
/* move children to free_list */
list_splice_init(&desc->tx_list, &atchan->free_list);
/* move myself to free_list */
@ -820,6 +828,93 @@ err_desc_get:
return NULL;
}
/**
* atc_prep_dma_memset - prepare a memcpy operation
* @chan: the channel to prepare operation on
* @dest: operation virtual destination address
* @value: value to set memory buffer to
* @len: operation length
* @flags: tx descriptor status flags
*/
static struct dma_async_tx_descriptor *
atc_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
size_t len, unsigned long flags)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma *atdma = to_at_dma(chan->device);
struct at_desc *desc = NULL;
size_t xfer_count;
u32 ctrla;
u32 ctrlb;
dev_vdbg(chan2dev(chan), "%s: d0x%x v0x%x l0x%zx f0x%lx\n", __func__,
dest, value, len, flags);
if (unlikely(!len)) {
dev_dbg(chan2dev(chan), "%s: length is zero!\n", __func__);
return NULL;
}
if (!is_dma_fill_aligned(chan->device, dest, 0, len)) {
dev_dbg(chan2dev(chan), "%s: buffer is not aligned\n",
__func__);
return NULL;
}
xfer_count = len >> 2;
if (xfer_count > ATC_BTSIZE_MAX) {
dev_err(chan2dev(chan), "%s: buffer is too big\n",
__func__);
return NULL;
}
ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN
| ATC_SRC_ADDR_MODE_FIXED
| ATC_DST_ADDR_MODE_INCR
| ATC_FC_MEM2MEM;
ctrla = ATC_SRC_WIDTH(2) |
ATC_DST_WIDTH(2);
desc = atc_desc_get(atchan);
if (!desc) {
dev_err(chan2dev(chan), "%s: can't get a descriptor\n",
__func__);
return NULL;
}
desc->memset_vaddr = dma_pool_alloc(atdma->memset_pool, GFP_ATOMIC,
&desc->memset_paddr);
if (!desc->memset_vaddr) {
dev_err(chan2dev(chan), "%s: couldn't allocate buffer\n",
__func__);
goto err_put_desc;
}
*desc->memset_vaddr = value;
desc->memset = true;
desc->lli.saddr = desc->memset_paddr;
desc->lli.daddr = dest;
desc->lli.ctrla = ctrla | xfer_count;
desc->lli.ctrlb = ctrlb;
desc->txd.cookie = -EBUSY;
desc->len = len;
desc->total_len = len;
/* set end-of-link on the descriptor */
set_desc_eol(desc);
desc->txd.flags = flags;
return &desc->txd;
err_put_desc:
atc_desc_put(atchan, desc);
return NULL;
}
/**
* atc_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
@ -1713,6 +1808,8 @@ static int __init at_dma_probe(struct platform_device *pdev)
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_MEMSET, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_PRIVATE, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_SLAVE, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_SG, at91sam9g45_config.cap_mask);
@ -1776,7 +1873,16 @@ static int __init at_dma_probe(struct platform_device *pdev)
if (!atdma->dma_desc_pool) {
dev_err(&pdev->dev, "No memory for descriptors dma pool\n");
err = -ENOMEM;
goto err_pool_create;
goto err_desc_pool_create;
}
/* create a pool of consistent memory blocks for memset blocks */
atdma->memset_pool = dma_pool_create("at_hdmac_memset_pool",
&pdev->dev, sizeof(int), 4, 0);
if (!atdma->memset_pool) {
dev_err(&pdev->dev, "No memory for memset dma pool\n");
err = -ENOMEM;
goto err_memset_pool_create;
}
/* clear any pending interrupt */
@ -1822,6 +1928,11 @@ static int __init at_dma_probe(struct platform_device *pdev)
if (dma_has_cap(DMA_MEMCPY, atdma->dma_common.cap_mask))
atdma->dma_common.device_prep_dma_memcpy = atc_prep_dma_memcpy;
if (dma_has_cap(DMA_MEMSET, atdma->dma_common.cap_mask)) {
atdma->dma_common.device_prep_dma_memset = atc_prep_dma_memset;
atdma->dma_common.fill_align = DMAENGINE_ALIGN_4_BYTES;
}
if (dma_has_cap(DMA_SLAVE, atdma->dma_common.cap_mask)) {
atdma->dma_common.device_prep_slave_sg = atc_prep_slave_sg;
/* controller can do slave DMA: can trigger cyclic transfers */
@ -1842,8 +1953,9 @@ static int __init at_dma_probe(struct platform_device *pdev)
dma_writel(atdma, EN, AT_DMA_ENABLE);
dev_info(&pdev->dev, "Atmel AHB DMA Controller ( %s%s%s), %d channels\n",
dev_info(&pdev->dev, "Atmel AHB DMA Controller ( %s%s%s%s), %d channels\n",
dma_has_cap(DMA_MEMCPY, atdma->dma_common.cap_mask) ? "cpy " : "",
dma_has_cap(DMA_MEMSET, atdma->dma_common.cap_mask) ? "set " : "",
dma_has_cap(DMA_SLAVE, atdma->dma_common.cap_mask) ? "slave " : "",
dma_has_cap(DMA_SG, atdma->dma_common.cap_mask) ? "sg-cpy " : "",
plat_dat->nr_channels);
@ -1868,8 +1980,10 @@ static int __init at_dma_probe(struct platform_device *pdev)
err_of_dma_controller_register:
dma_async_device_unregister(&atdma->dma_common);
dma_pool_destroy(atdma->memset_pool);
err_memset_pool_create:
dma_pool_destroy(atdma->dma_desc_pool);
err_pool_create:
err_desc_pool_create:
free_irq(platform_get_irq(pdev, 0), atdma);
err_irq:
clk_disable_unprepare(atdma->clk);
@ -1894,6 +2008,7 @@ static int at_dma_remove(struct platform_device *pdev)
at_dma_off(atdma);
dma_async_device_unregister(&atdma->dma_common);
dma_pool_destroy(atdma->memset_pool);
dma_pool_destroy(atdma->dma_desc_pool);
free_irq(platform_get_irq(pdev, 0), atdma);

6
drivers/dma/at_hdmac_regs.h
View File

@ -201,6 +201,11 @@ struct at_desc {
size_t boundary;
size_t dst_hole;
size_t src_hole;
/* Memset temporary buffer */
bool memset;
dma_addr_t memset_paddr;
int *memset_vaddr;
};
static inline struct at_desc *
@ -331,6 +336,7 @@ struct at_dma {
u8 all_chan_mask;
struct dma_pool *dma_desc_pool;
struct dma_pool *memset_pool;
/* AT THE END channels table */
struct at_dma_chan chan[0];
};