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dmaengine: imx-sdma: Support allocate memory from internal SRAM (iram)

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Allocate memory from SoC internal SRAM to reduce DDR access and keep DDR in
lower power state (such as self-referesh) longer.

Check iram_pool before sdma_init() so that ccb/context could be allocated
from iram because DDR maybe in self-referesh in lower power audio case
while sdma still running.

Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Nicolin Chen <b42378@freescale.com>
Signed-off-by: Joy Zou <joy.zou@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240329-sdma_upstream-v4-1-daeb3067dea7@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Nicolin Chen 2024-03-29 10:34:41 -04:00 committed by Vinod Koul
parent 7eccb5a5b2
commit 802ef22310
1 changed files with 36 additions and 10 deletions
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46
drivers/dma/imx-sdma.c
View File

@ -24,6 +24,7 @@
#include <linux/semaphore.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/genalloc.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
#include <linux/slab.h>
@ -531,6 +532,7 @@ struct sdma_engine {
/* clock ratio for AHB:SDMA core. 1:1 is 1, 2:1 is 0*/
bool clk_ratio;
bool fw_loaded;
struct gen_pool *iram_pool;
};
static int sdma_config_write(struct dma_chan *chan,
@ -1358,8 +1360,14 @@ static int sdma_request_channel0(struct sdma_engine *sdma)
{
int ret = -EBUSY;
sdma->bd0 = dma_alloc_coherent(sdma->dev, PAGE_SIZE, &sdma->bd0_phys,
GFP_NOWAIT);
if (sdma->iram_pool)
sdma->bd0 = gen_pool_dma_alloc(sdma->iram_pool,
sizeof(struct sdma_buffer_descriptor),
&sdma->bd0_phys);
else
sdma->bd0 = dma_alloc_coherent(sdma->dev,
sizeof(struct sdma_buffer_descriptor),
&sdma->bd0_phys, GFP_NOWAIT);
if (!sdma->bd0) {
ret = -ENOMEM;
goto out;
@ -1379,10 +1387,14 @@ static int sdma_request_channel0(struct sdma_engine *sdma)
static int sdma_alloc_bd(struct sdma_desc *desc)
{
u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
struct sdma_engine *sdma = desc->sdmac->sdma;
int ret = 0;
desc->bd = dma_alloc_coherent(desc->sdmac->sdma->dev, bd_size,
&desc->bd_phys, GFP_NOWAIT);
if (sdma->iram_pool)
desc->bd = gen_pool_dma_alloc(sdma->iram_pool, bd_size, &desc->bd_phys);
else
desc->bd = dma_alloc_coherent(sdma->dev, bd_size, &desc->bd_phys, GFP_NOWAIT);
if (!desc->bd) {
ret = -ENOMEM;
goto out;
@ -1394,9 +1406,12 @@ static int sdma_alloc_bd(struct sdma_desc *desc)
static void sdma_free_bd(struct sdma_desc *desc)
{
u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
struct sdma_engine *sdma = desc->sdmac->sdma;
dma_free_coherent(desc->sdmac->sdma->dev, bd_size, desc->bd,
desc->bd_phys);
if (sdma->iram_pool)
gen_pool_free(sdma->iram_pool, (unsigned long)desc->bd, bd_size);
else
dma_free_coherent(desc->sdmac->sdma->dev, bd_size, desc->bd, desc->bd_phys);
}
static void sdma_desc_free(struct virt_dma_desc *vd)
@ -2068,6 +2083,7 @@ static int sdma_init(struct sdma_engine *sdma)
{
int i, ret;
dma_addr_t ccb_phys;
int ccbsize;
ret = clk_enable(sdma->clk_ipg);
if (ret)
@ -2083,10 +2099,14 @@ static int sdma_init(struct sdma_engine *sdma)
/* Be sure SDMA has not started yet */
writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
sdma->channel_control = dma_alloc_coherent(sdma->dev,
MAX_DMA_CHANNELS * sizeof(struct sdma_channel_control) +
sizeof(struct sdma_context_data),
&ccb_phys, GFP_KERNEL);
ccbsize = MAX_DMA_CHANNELS * (sizeof(struct sdma_channel_control)
+ sizeof(struct sdma_context_data));
if (sdma->iram_pool)
sdma->channel_control = gen_pool_dma_alloc(sdma->iram_pool, ccbsize, &ccb_phys);
else
sdma->channel_control = dma_alloc_coherent(sdma->dev, ccbsize, &ccb_phys,
GFP_KERNEL);
if (!sdma->channel_control) {
ret = -ENOMEM;
@ -2272,6 +2292,12 @@ static int sdma_probe(struct platform_device *pdev)
vchan_init(&sdmac->vc, &sdma->dma_device);
}
if (np) {
sdma->iram_pool = of_gen_pool_get(np, "iram", 0);
if (sdma->iram_pool)
dev_info(&pdev->dev, "alloc bd from iram.\n");
}
ret = sdma_init(sdma);
if (ret)
goto err_init;