Provide functions to enable/disable NAND IRQs, get
NAND event status and clear NAND events.
The NAND events of interest are TERMCOUNT and FIFOEVENT.
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
drivers/memory/omap-gpmc.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/omap-gpmc.h | 4 ++++
2 files changed, 54 insertions(+)
diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index e70a8df..713d7af 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -1078,8 +1078,58 @@ static bool gpmc_nand_writebuffer_empty(void)
return false;
}
+static int gpmc_nand_irq_enable(enum gpmc_nand_irq irq)
+{
+ u32 reg;
+
+ if (irq > GPMC_NAND_IRQ_TERMCOUNT)
+ return -EINVAL;
+
+ reg = gpmc_read_reg(GPMC_IRQENABLE);
+ reg |= BIT(irq);
+ gpmc_write_reg(GPMC_IRQENABLE, reg);
+
+ return 0;
+}
+
+static int gpmc_nand_irq_disable(enum gpmc_nand_irq irq)
+{
+ u32 reg;
+
+ if (irq > GPMC_NAND_IRQ_TERMCOUNT)
+ return -EINVAL;
+
+ reg = gpmc_read_reg(GPMC_IRQENABLE);
+ reg &= ~BIT(irq);
+ gpmc_write_reg(GPMC_IRQENABLE, reg);
+
+ return 0;
+}
+
+static void gpmc_nand_irq_clear(enum gpmc_nand_irq irq)
+{
+ if (irq > GPMC_NAND_IRQ_TERMCOUNT)
+ return;
+
+ /* setting bit to 1 clears the bit in IRQSTATUS */
+ gpmc_write_reg(GPMC_IRQSTATUS, BIT(irq));
+}
+
+static u32 gpmc_nand_irq_status(void)
+{
+ u32 reg = gpmc_read_reg(GPMC_IRQSTATUS);
+
+ /* Mask out non-NAND bits */
+ reg &= GPMC_IRQENABLE_FIFOEVENT | GPMC_IRQENABLE_TERMCOUNT;
+ return reg;
+}
+
static struct gpmc_nand_ops nand_ops = {
.nand_writebuffer_empty = gpmc_nand_writebuffer_empty,
+ .nand_irq_enable = gpmc_nand_irq_enable,
+ .nand_irq_disable = gpmc_nand_irq_disable,
+ .nand_irq_clear = gpmc_nand_irq_clear,
+ .nand_irq_status = gpmc_nand_irq_status,
};
/**
diff --git a/include/linux/omap-gpmc.h b/include/linux/omap-gpmc.h
index 44e322f..063a84f 100644
--- a/include/linux/omap-gpmc.h
+++ b/include/linux/omap-gpmc.h
@@ -11,6 +11,10 @@
#define GPMC_CONFIG_WP 0x00000005
+/* GPMC IRQENABLE/IRQSTATUS BIT defs */
+#define GPMC_IRQENABLE_FIFOEVENT BIT(0)
+#define GPMC_IRQENABLE_TERMCOUNT BIT(1)
+
enum gpmc_nand_irq {
GPMC_NAND_IRQ_FIFOEVENT = 0,
GPMC_NAND_IRQ_TERMCOUNT,
--
2.1.4
--
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