forked from luck/tmp_suning_uos_patched
mtd: OneNAND: S5PC110: Implement DMA interrupt method
Implement DMA interrupt method. previous time it polls the DMA status. It can reduce the CPU power but decrease the performance a little. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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@ -22,6 +22,7 @@
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#include <linux/mtd/onenand.h>
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#include <linux/mtd/partitions.h>
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <asm/mach/flash.h>
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#include <plat/regs-onenand.h>
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@ -81,6 +82,17 @@ enum soc_type {
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#define S5PC110_DMA_TRANS_CMD 0x418
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#define S5PC110_DMA_TRANS_STATUS 0x41C
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#define S5PC110_DMA_TRANS_DIR 0x420
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#define S5PC110_INTC_DMA_CLR 0x1004
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#define S5PC110_INTC_ONENAND_CLR 0x1008
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#define S5PC110_INTC_DMA_MASK 0x1024
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#define S5PC110_INTC_ONENAND_MASK 0x1028
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#define S5PC110_INTC_DMA_PEND 0x1044
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#define S5PC110_INTC_ONENAND_PEND 0x1048
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#define S5PC110_INTC_DMA_STATUS 0x1064
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#define S5PC110_INTC_ONENAND_STATUS 0x1068
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#define S5PC110_INTC_DMA_TD (1 << 24)
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#define S5PC110_INTC_DMA_TE (1 << 16)
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#define S5PC110_DMA_CFG_SINGLE (0x0 << 16)
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#define S5PC110_DMA_CFG_4BURST (0x2 << 16)
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@ -134,6 +146,7 @@ struct s3c_onenand {
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void __iomem *dma_addr;
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struct resource *dma_res;
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unsigned long phys_base;
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struct completion complete;
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#ifdef CONFIG_MTD_PARTITIONS
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struct mtd_partition *parts;
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#endif
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@ -531,7 +544,9 @@ static int onenand_write_bufferram(struct mtd_info *mtd, int area,
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return 0;
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}
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static int s5pc110_dma_ops(void *dst, void *src, size_t count, int direction)
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static int (*s5pc110_dma_ops)(void *dst, void *src, size_t count, int direction);
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static int s5pc110_dma_poll(void *dst, void *src, size_t count, int direction)
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{
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void __iomem *base = onenand->dma_addr;
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int status;
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@ -575,6 +590,60 @@ static int s5pc110_dma_ops(void *dst, void *src, size_t count, int direction)
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return 0;
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}
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static irqreturn_t s5pc110_onenand_irq(int irq, void *data)
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{
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void __iomem *base = onenand->dma_addr;
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int status, cmd = 0;
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status = readl(base + S5PC110_INTC_DMA_STATUS);
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if (likely(status & S5PC110_INTC_DMA_TD))
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cmd = S5PC110_DMA_TRANS_CMD_TDC;
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if (unlikely(status & S5PC110_INTC_DMA_TE))
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cmd = S5PC110_DMA_TRANS_CMD_TEC;
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writel(cmd, base + S5PC110_DMA_TRANS_CMD);
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writel(status, base + S5PC110_INTC_DMA_CLR);
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if (!onenand->complete.done)
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complete(&onenand->complete);
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return IRQ_HANDLED;
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}
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static int s5pc110_dma_irq(void *dst, void *src, size_t count, int direction)
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{
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void __iomem *base = onenand->dma_addr;
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int status;
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status = readl(base + S5PC110_INTC_DMA_MASK);
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if (status) {
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status &= ~(S5PC110_INTC_DMA_TD | S5PC110_INTC_DMA_TE);
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writel(status, base + S5PC110_INTC_DMA_MASK);
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}
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writel(src, base + S5PC110_DMA_SRC_ADDR);
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writel(dst, base + S5PC110_DMA_DST_ADDR);
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if (direction == S5PC110_DMA_DIR_READ) {
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writel(S5PC110_DMA_SRC_CFG_READ, base + S5PC110_DMA_SRC_CFG);
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writel(S5PC110_DMA_DST_CFG_READ, base + S5PC110_DMA_DST_CFG);
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} else {
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writel(S5PC110_DMA_SRC_CFG_WRITE, base + S5PC110_DMA_SRC_CFG);
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writel(S5PC110_DMA_DST_CFG_WRITE, base + S5PC110_DMA_DST_CFG);
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}
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writel(count, base + S5PC110_DMA_TRANS_SIZE);
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writel(direction, base + S5PC110_DMA_TRANS_DIR);
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writel(S5PC110_DMA_TRANS_CMD_TR, base + S5PC110_DMA_TRANS_CMD);
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wait_for_completion_timeout(&onenand->complete, msecs_to_jiffies(20));
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return 0;
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}
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static int s5pc110_read_bufferram(struct mtd_info *mtd, int area,
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unsigned char *buffer, int offset, size_t count)
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{
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@ -919,6 +988,20 @@ static int s3c_onenand_probe(struct platform_device *pdev)
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}
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onenand->phys_base = onenand->base_res->start;
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s5pc110_dma_ops = s5pc110_dma_poll;
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/* Interrupt support */
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r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (r) {
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init_completion(&onenand->complete);
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s5pc110_dma_ops = s5pc110_dma_irq;
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err = request_irq(r->start, s5pc110_onenand_irq,
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IRQF_SHARED, "onenand", &onenand);
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if (err) {
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dev_err(&pdev->dev, "failed to get irq\n");
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goto scan_failed;
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}
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}
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}
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if (onenand_scan(mtd, 1)) {
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