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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>
This commit is contained in:
Kyungmin Park 2010-09-28 19:27:15 +09:00 committed by David Woodhouse
parent dcf08227e9
commit e23abf4b77
1 changed files with 84 additions and 1 deletions
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85
drivers/mtd/onenand/samsung.c
View File

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