Manage NAND interrupts here using the GPMC IRQ ops.
This causes performance in prefetch-irq mode to be increased
from
[ 38.252811] mtd_speedtest: eraseblock write speed is 5576 KiB/s
[ 39.265259] mtd_speedtest: eraseblock read speed is 8192 KiB/s
to
[ 35.666446] mtd_speedtest: eraseblock write speed is 6537 KiB/s
[ 36.444842] mtd_speedtest: eraseblock read speed is 10680 KiB/s
Test results on dra7-evm using mtd_speedtest.ko
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
drivers/mtd/nand/omap2.c | 65 +++++++++++++++++++++++-------------------------
1 file changed, 31 insertions(+), 34 deletions(-)
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 0eb0b8c..267bcdd 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -162,8 +162,7 @@ struct omap_nand_info {
enum omap_ecc ecc_opt;
struct completion comp;
struct dma_chan *dma;
- int gpmc_irq_fifo;
- int gpmc_irq_count;
+ int gpmc_irq;
enum {
OMAP_NAND_IO_READ = 0, /* read */
OMAP_NAND_IO_WRITE, /* write */
@@ -579,12 +578,17 @@ static irqreturn_t omap_nand_irq(int this_irq, void *dev)
{
struct omap_nand_info *info = (struct omap_nand_info *) dev;
u32 bytes;
+ u32 irqstatus;
+
+ irqstatus = info->ops->nand_irq_status();
+ if (!irqstatus)
+ return IRQ_NONE;
bytes = readl(info->reg.gpmc_prefetch_status);
bytes = PREFETCH_STATUS_FIFO_CNT(bytes);
bytes = bytes & 0xFFFC; /* io in multiple of 4 bytes */
if (info->iomode == OMAP_NAND_IO_WRITE) { /* checks for write io */
- if (this_irq == info->gpmc_irq_count)
+ if (irqstatus & GPMC_IRQENABLE_TERMCOUNT)
goto done;
if (info->buf_len && (info->buf_len < bytes))
@@ -601,17 +605,25 @@ static irqreturn_t omap_nand_irq(int this_irq, void *dev)
(u32 *)info->buf, bytes >> 2);
info->buf = info->buf + bytes;
- if (this_irq == info->gpmc_irq_count)
+ if (irqstatus & GPMC_IRQENABLE_TERMCOUNT)
goto done;
}
+ /* Clear FIFOEVENT STATUS */
+ info->ops->nand_irq_clear(GPMC_NAND_IRQ_FIFOEVENT);
+
return IRQ_HANDLED;
done:
complete(&info->comp);
- disable_irq_nosync(info->gpmc_irq_fifo);
- disable_irq_nosync(info->gpmc_irq_count);
+ /* Clear FIFOEVENT and TERMCOUNT STATUS */
+ info->ops->nand_irq_clear(GPMC_NAND_IRQ_FIFOEVENT);
+ info->ops->nand_irq_clear(GPMC_NAND_IRQ_TERMCOUNT);
+
+ /* Disable Interrupt generation */
+ info->ops->nand_irq_disable(GPMC_NAND_IRQ_FIFOEVENT);
+ info->ops->nand_irq_disable(GPMC_NAND_IRQ_TERMCOUNT);
return IRQ_HANDLED;
}
@@ -646,8 +658,9 @@ static void omap_read_buf_irq_pref(struct mtd_info *mtd, u_char *buf, int len)
info->buf_len = len;
- enable_irq(info->gpmc_irq_count);
- enable_irq(info->gpmc_irq_fifo);
+ /* Enable Interrupt generation */
+ info->ops->nand_irq_enable(GPMC_NAND_IRQ_TERMCOUNT);
+ info->ops->nand_irq_enable(GPMC_NAND_IRQ_FIFOEVENT);
/* waiting for read to complete */
wait_for_completion(&info->comp);
@@ -696,8 +709,9 @@ static void omap_write_buf_irq_pref(struct mtd_info *mtd,
info->buf_len = len;
- enable_irq(info->gpmc_irq_count);
- enable_irq(info->gpmc_irq_fifo);
+ /* Enable Interrupt generation */
+ info->ops->nand_irq_enable(GPMC_NAND_IRQ_TERMCOUNT);
+ info->ops->nand_irq_enable(GPMC_NAND_IRQ_FIFOEVENT);
/* waiting for write to complete */
wait_for_completion(&info->comp);
@@ -1776,35 +1790,18 @@ static int omap_nand_probe(struct platform_device *pdev)
break;
case NAND_OMAP_PREFETCH_IRQ:
- info->gpmc_irq_fifo = platform_get_irq(pdev, 0);
- if (info->gpmc_irq_fifo <= 0) {
- dev_err(&pdev->dev, "error getting fifo irq\n");
- err = -ENODEV;
- goto return_error;
- }
- err = devm_request_irq(&pdev->dev, info->gpmc_irq_fifo,
- omap_nand_irq, IRQF_SHARED,
- "gpmc-nand-fifo", info);
- if (err) {
- dev_err(&pdev->dev, "requesting irq(%d) error:%d",
- info->gpmc_irq_fifo, err);
- info->gpmc_irq_fifo = 0;
- goto return_error;
- }
-
- info->gpmc_irq_count = platform_get_irq(pdev, 1);
- if (info->gpmc_irq_count <= 0) {
- dev_err(&pdev->dev, "error getting count irq\n");
+ info->gpmc_irq = platform_get_irq(pdev, 0);
+ if (info->gpmc_irq <= 0) {
+ dev_err(&pdev->dev, "error getting GPMC irq\n");
err = -ENODEV;
goto return_error;
}
- err = devm_request_irq(&pdev->dev, info->gpmc_irq_count,
- omap_nand_irq, IRQF_SHARED,
- "gpmc-nand-count", info);
+ err = devm_request_irq(&pdev->dev, info->gpmc_irq,
+ omap_nand_irq, IRQF_SHARED,
+ DRIVER_NAME, info);
if (err) {
dev_err(&pdev->dev, "requesting irq(%d) error:%d",
- info->gpmc_irq_count, err);
- info->gpmc_irq_count = 0;
+ info->gpmc_irq, err);
goto return_error;
}
--
2.1.4
--
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