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Subject[PATCH 2/4] spi: sprd: Add the SPI irq function for the SPI DMA mode
Date
From: Lanqing Liu <lanqing.liu@spreadtrum.com>

The SPI irq event will use to complete the SPI work in the SPI DMA mode,
so this patch is a preparation for the following DMA mode support.

Signed-off-by: Lanqing Liu <lanqing.liu@spreadtrum.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
drivers/spi/spi-sprd.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)

diff --git a/drivers/spi/spi-sprd.c b/drivers/spi/spi-sprd.c
index fa324ce..bfba30b 100644
--- a/drivers/spi/spi-sprd.c
+++ b/drivers/spi/spi-sprd.c
@@ -133,6 +133,7 @@ struct sprd_spi {
void __iomem *base;
struct device *dev;
struct clk *clk;
+ int irq;
u32 src_clk;
u32 hw_mode;
u32 trans_len;
@@ -141,6 +142,7 @@ struct sprd_spi {
u32 hw_speed_hz;
u32 len;
int status;
+ struct completion xfer_completion;
const void *tx_buf;
void *rx_buf;
int (*read_bufs)(struct sprd_spi *ss, u32 len);
@@ -575,6 +577,45 @@ static int sprd_spi_transfer_one(struct spi_controller *sctlr,
return ret;
}

+static irqreturn_t sprd_spi_handle_irq(int irq, void *data)
+{
+ struct sprd_spi *ss = (struct sprd_spi *)data;
+ u32 val = readl_relaxed(ss->base + SPRD_SPI_INT_MASK_STS);
+
+ if (val & SPRD_SPI_MASK_TX_END) {
+ writel_relaxed(SPRD_SPI_TX_END_CLR, ss->base + SPRD_SPI_INT_CLR);
+ if (!(ss->trans_mode & SPRD_SPI_RX_MODE))
+ complete(&ss->xfer_completion);
+ return IRQ_HANDLED;
+ }
+
+ if (val & SPRD_SPI_MASK_RX_END) {
+ writel_relaxed(SPRD_SPI_RX_END_CLR, ss->base + SPRD_SPI_INT_CLR);
+ complete(&ss->xfer_completion);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int sprd_spi_irq_init(struct platform_device *pdev, struct sprd_spi *ss)
+{
+ int ret;
+
+ ss->irq = platform_get_irq(pdev, 0);
+ if (ss->irq < 0) {
+ dev_err(&pdev->dev, "failed to get irq resource\n");
+ return ss->irq;
+ }
+
+ ret = devm_request_irq(&pdev->dev, ss->irq, sprd_spi_handle_irq,
+ 0, pdev->name, ss);
+ if (ret)
+ dev_err(&pdev->dev, "failed to request spi irq %d, ret = %d\n",
+ ss->irq, ret);
+
+ return ret;
+}
+
static int sprd_spi_clk_init(struct platform_device *pdev, struct sprd_spi *ss)
{
struct clk *clk_spi, *clk_parent;
@@ -635,11 +676,16 @@ static int sprd_spi_probe(struct platform_device *pdev)
sctlr->max_speed_hz = min_t(u32, ss->src_clk >> 1,
SPRD_SPI_MAX_SPEED_HZ);

+ init_completion(&ss->xfer_completion);
platform_set_drvdata(pdev, sctlr);
ret = sprd_spi_clk_init(pdev, ss);
if (ret)
goto free_controller;

+ ret = sprd_spi_irq_init(pdev, ss);
+ if (ret)
+ goto free_controller;
+
ret = clk_prepare_enable(ss->clk);
if (ret)
goto free_controller;
--
1.7.9.5
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