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path: root/drivers/mtd/onenand/samsung.c
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Diffstat (limited to 'drivers/mtd/onenand/samsung.c')
-rw-r--r--drivers/mtd/onenand/samsung.c133
1 files changed, 115 insertions, 18 deletions
diff --git a/drivers/mtd/onenand/samsung.c b/drivers/mtd/onenand/samsung.c
index a460f1b..0de7a05 100644
--- a/drivers/mtd/onenand/samsung.c
+++ b/drivers/mtd/onenand/samsung.c
@@ -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>
@@ -58,7 +59,7 @@ enum soc_type {
#define MAP_11 (0x3)
#define S3C64XX_CMD_MAP_SHIFT 24
-#define S5PC1XX_CMD_MAP_SHIFT 26
+#define S5PC100_CMD_MAP_SHIFT 26
#define S3C6400_FBA_SHIFT 10
#define S3C6400_FPA_SHIFT 4
@@ -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
@@ -191,7 +204,7 @@ static unsigned int s3c64xx_cmd_map(unsigned type, unsigned val)
static unsigned int s5pc1xx_cmd_map(unsigned type, unsigned val)
{
- return (type << S5PC1XX_CMD_MAP_SHIFT) | val;
+ return (type << S5PC100_CMD_MAP_SHIFT) | val;
}
static unsigned int s3c6400_mem_addr(int fba, int fpa, int fsa)
@@ -531,10 +544,13 @@ 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;
+ unsigned long timeout;
writel(src, base + S5PC110_DMA_SRC_ADDR);
writel(dst, base + S5PC110_DMA_DST_ADDR);
@@ -552,6 +568,13 @@ static int s5pc110_dma_ops(void *dst, void *src, size_t count, int direction)
writel(S5PC110_DMA_TRANS_CMD_TR, base + S5PC110_DMA_TRANS_CMD);
+ /*
+ * There's no exact timeout values at Spec.
+ * In real case it takes under 1 msec.
+ * So 20 msecs are enough.
+ */
+ timeout = jiffies + msecs_to_jiffies(20);
+
do {
status = readl(base + S5PC110_DMA_TRANS_STATUS);
if (status & S5PC110_DMA_TRANS_STATUS_TE) {
@@ -559,13 +582,68 @@ static int s5pc110_dma_ops(void *dst, void *src, size_t count, int direction)
base + S5PC110_DMA_TRANS_CMD);
return -EIO;
}
- } while (!(status & S5PC110_DMA_TRANS_STATUS_TD));
+ } while (!(status & S5PC110_DMA_TRANS_STATUS_TD) &&
+ time_before(jiffies, timeout));
writel(S5PC110_DMA_TRANS_CMD_TDC, base + S5PC110_DMA_TRANS_CMD);
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)
{
@@ -573,7 +651,8 @@ static int s5pc110_read_bufferram(struct mtd_info *mtd, int area,
void __iomem *p;
void *buf = (void *) buffer;
dma_addr_t dma_src, dma_dst;
- int err;
+ int err, page_dma = 0;
+ struct device *dev = &onenand->pdev->dev;
p = this->base + area;
if (ONENAND_CURRENT_BUFFERRAM(this)) {
@@ -597,21 +676,27 @@ static int s5pc110_read_bufferram(struct mtd_info *mtd, int area,
page = vmalloc_to_page(buf);
if (!page)
goto normal;
- buf = page_address(page) + ((size_t) buf & ~PAGE_MASK);
- }
- /* DMA routine */
- dma_src = onenand->phys_base + (p - this->base);
- dma_dst = dma_map_single(&onenand->pdev->dev,
- buf, count, DMA_FROM_DEVICE);
- if (dma_mapping_error(&onenand->pdev->dev, dma_dst)) {
- dev_err(&onenand->pdev->dev,
- "Couldn't map a %d byte buffer for DMA\n", count);
+ page_dma = 1;
+ /* DMA routine */
+ dma_src = onenand->phys_base + (p - this->base);
+ dma_dst = dma_map_page(dev, page, 0, count, DMA_FROM_DEVICE);
+ } else {
+ /* DMA routine */
+ dma_src = onenand->phys_base + (p - this->base);
+ dma_dst = dma_map_single(dev, buf, count, DMA_FROM_DEVICE);
+ }
+ if (dma_mapping_error(dev, dma_dst)) {
+ dev_err(dev, "Couldn't map a %d byte buffer for DMA\n", count);
goto normal;
}
err = s5pc110_dma_ops((void *) dma_dst, (void *) dma_src,
count, S5PC110_DMA_DIR_READ);
- dma_unmap_single(&onenand->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
+
+ if (page_dma)
+ dma_unmap_page(dev, dma_dst, count, DMA_FROM_DEVICE);
+ else
+ dma_unmap_single(dev, dma_dst, count, DMA_FROM_DEVICE);
if (!err)
return 0;
@@ -759,7 +844,6 @@ static void s3c_onenand_setup(struct mtd_info *mtd)
onenand->cmd_map = s5pc1xx_cmd_map;
} else if (onenand->type == TYPE_S5PC110) {
/* Use generic onenand functions */
- onenand->cmd_map = s5pc1xx_cmd_map;
this->read_bufferram = s5pc110_read_bufferram;
this->chip_probe = s5pc110_chip_probe;
return;
@@ -904,6 +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)) {
@@ -1000,7 +1098,7 @@ static int s3c_pm_ops_suspend(struct device *dev)
struct onenand_chip *this = mtd->priv;
this->wait(mtd, FL_PM_SUSPENDED);
- return mtd->suspend(mtd);
+ return 0;
}
static int s3c_pm_ops_resume(struct device *dev)
@@ -1009,7 +1107,6 @@ static int s3c_pm_ops_resume(struct device *dev)
struct mtd_info *mtd = platform_get_drvdata(pdev);
struct onenand_chip *this = mtd->priv;
- mtd->resume(mtd);
this->unlock_all(mtd);
return 0;
}
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