dmaengine: imx-sdma: support allocate memory from iram
Allocate memory from SoC internal SRAM so that we can turn off voltage of external DDR to save power if 'iram' property in dts. Signed-off-by: Robin Gong <yibin.gong@nxp.com>5.4-rM2-2.2.x-imx-squashed
Nicolin Chen
Dong Aisheng
parent
2d1e5b8f23
commit
ff3799c817
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@ -24,6 +24,7 @@
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#include <linux/semaphore.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/genalloc.h>
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#include <linux/dma-mapping.h>
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#include <linux/firmware.h>
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#include <linux/slab.h>
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@ -451,6 +452,7 @@ struct sdma_engine {
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struct sdma_buffer_descriptor *bd0;
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/* clock ratio for AHB:SDMA core. 1:1 is 1, 2:1 is 0*/
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bool clk_ratio;
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struct gen_pool *iram_pool;
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};
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static int sdma_config_write(struct dma_chan *chan,
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@ -736,10 +738,13 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
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int ret;
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unsigned long flags;
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buf_virt = dma_alloc_coherent(sdma->dev, size, &buf_phys, GFP_KERNEL);
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if (!buf_virt) {
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if (sdma->iram_pool)
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buf_virt = gen_pool_dma_alloc(sdma->iram_pool, size, &buf_phys);
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else
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buf_virt = dma_alloc_coherent(sdma->dev, size, &buf_phys,
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GFP_KERNEL);
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if (!buf_virt)
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return -ENOMEM;
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}
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spin_lock_irqsave(&sdma->channel_0_lock, flags);
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@ -755,7 +760,10 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
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spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
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dma_free_coherent(sdma->dev, size, buf_virt, buf_phys);
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if (sdma->iram_pool)
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gen_pool_free(sdma->iram_pool, (unsigned long)buf_virt, size);
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else
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dma_free_coherent(sdma->dev, size, buf_virt, buf_phys);
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return ret;
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}
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@ -1250,8 +1258,12 @@ static int sdma_request_channel0(struct sdma_engine *sdma)
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{
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int ret = -EBUSY;
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sdma->bd0 = dma_alloc_coherent(sdma->dev, PAGE_SIZE, &sdma->bd0_phys,
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GFP_NOWAIT);
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if (sdma->iram_pool)
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sdma->bd0 = gen_pool_dma_alloc(sdma->iram_pool, PAGE_SIZE,
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&sdma->bd0_phys);
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else
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sdma->bd0 = dma_alloc_coherent(sdma->dev, PAGE_SIZE,
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&sdma->bd0_phys, GFP_NOWAIT);
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if (!sdma->bd0) {
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ret = -ENOMEM;
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goto out;
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@ -1271,10 +1283,15 @@ out:
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static int sdma_alloc_bd(struct sdma_desc *desc)
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{
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u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
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struct sdma_engine *sdma = desc->sdmac->sdma;
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int ret = 0;
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desc->bd = dma_alloc_coherent(desc->sdmac->sdma->dev, bd_size,
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&desc->bd_phys, GFP_NOWAIT);
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if (sdma->iram_pool)
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desc->bd = gen_pool_dma_alloc(sdma->iram_pool, PAGE_SIZE,
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&desc->bd_phys);
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else
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desc->bd = dma_alloc_coherent(sdma->dev, bd_size,
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&desc->bd_phys, GFP_NOWAIT);
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if (!desc->bd) {
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ret = -ENOMEM;
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goto out;
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@ -1286,9 +1303,14 @@ out:
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static void sdma_free_bd(struct sdma_desc *desc)
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{
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u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
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struct sdma_engine *sdma = desc->sdmac->sdma;
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dma_free_coherent(desc->sdmac->sdma->dev, bd_size, desc->bd,
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desc->bd_phys);
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if (sdma->iram_pool)
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gen_pool_free(sdma->iram_pool, (unsigned long)desc->bd,
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PAGE_SIZE);
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else
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dma_free_coherent(desc->sdmac->sdma->dev, bd_size, desc->bd,
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desc->bd_phys);
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}
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static void sdma_desc_free(struct virt_dma_desc *vd)
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@ -1904,7 +1926,7 @@ static int sdma_get_firmware(struct sdma_engine *sdma,
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static int sdma_init(struct sdma_engine *sdma)
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{
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int i, ret;
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int i, ret, ccbsize;
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dma_addr_t ccb_phys;
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ret = clk_enable(sdma->clk_ipg);
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@ -1921,11 +1943,15 @@ static int sdma_init(struct sdma_engine *sdma)
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/* Be sure SDMA has not started yet */
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writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
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sdma->channel_control = dma_alloc_coherent(sdma->dev,
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MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) +
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sizeof(struct sdma_context_data),
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&ccb_phys, GFP_KERNEL);
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ccbsize = MAX_DMA_CHANNELS * sizeof(struct sdma_channel_control)
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+ sizeof(struct sdma_context_data);
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if (sdma->iram_pool)
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sdma->channel_control = gen_pool_dma_alloc(sdma->iram_pool,
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ccbsize, &ccb_phys);
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else
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sdma->channel_control = dma_alloc_coherent(sdma->dev, ccbsize,
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&ccb_phys, GFP_KERNEL);
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if (!sdma->channel_control) {
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ret = -ENOMEM;
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goto err_dma_alloc;
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@ -2179,6 +2205,10 @@ static int sdma_probe(struct platform_device *pdev)
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sdma->spba_end_addr = spba_res.end;
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}
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of_node_put(spba_bus);
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sdma->iram_pool = of_gen_pool_get(np, "iram", 0);
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if (sdma->iram_pool)
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dev_info(&pdev->dev, "alloc bd from iram. \n");
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}
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/*
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