From 802ef223101fec83d92e045f89000b228904a580 Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Fri, 29 Mar 2024 10:34:41 -0400 Subject: dmaengine: imx-sdma: Support allocate memory from internal SRAM (iram) 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 Signed-off-by: Nicolin Chen Signed-off-by: Joy Zou Reviewed-by: Daniel Baluta Signed-off-by: Frank Li Link: https://lore.kernel.org/r/20240329-sdma_upstream-v4-1-daeb3067dea7@nxp.com Signed-off-by: Vinod Koul --- drivers/dma/imx-sdma.c | 46 ++++++++++++++++++++++++++++++++++++---------- 1 file changed, 36 insertions(+), 10 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 9b42f5e96b1e..4f1a9d1b152d 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -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 @@ out: 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 @@ out: 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; -- cgit v1.2.3