diff options
Diffstat (limited to 'drivers/spi/spi-s3c64xx.c')
| -rw-r--r-- | drivers/spi/spi-s3c64xx.c | 57 |
1 files changed, 55 insertions, 2 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 019a7163572..d56066bcbb9 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -20,6 +20,7 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/workqueue.h> +#include <linux/interrupt.h> #include <linux/delay.h> #include <linux/clk.h> #include <linux/dma-mapping.h> @@ -153,6 +154,7 @@ struct s3c64xx_spi_dma_data { * @tx_dmach: Controller's DMA channel for Tx. * @sfr_start: BUS address of SPI controller regs. * @regs: Pointer to ioremap'ed controller registers. + * @irq: interrupt * @xfer_completion: To indicate completion of xfer task. * @cur_mode: Stores the active configuration of the controller. * @cur_bpw: Stores the active bits per word settings. @@ -930,6 +932,33 @@ setup_exit: return err; } +static irqreturn_t s3c64xx_spi_irq(int irq, void *data) +{ + struct s3c64xx_spi_driver_data *sdd = data; + struct spi_master *spi = sdd->master; + unsigned int val; + + val = readl(sdd->regs + S3C64XX_SPI_PENDING_CLR); + + val &= S3C64XX_SPI_PND_RX_OVERRUN_CLR | + S3C64XX_SPI_PND_RX_UNDERRUN_CLR | + S3C64XX_SPI_PND_TX_OVERRUN_CLR | + S3C64XX_SPI_PND_TX_UNDERRUN_CLR; + + writel(val, sdd->regs + S3C64XX_SPI_PENDING_CLR); + + if (val & S3C64XX_SPI_PND_RX_OVERRUN_CLR) + dev_err(&spi->dev, "RX overrun\n"); + if (val & S3C64XX_SPI_PND_RX_UNDERRUN_CLR) + dev_err(&spi->dev, "RX underrun\n"); + if (val & S3C64XX_SPI_PND_TX_OVERRUN_CLR) + dev_err(&spi->dev, "TX overrun\n"); + if (val & S3C64XX_SPI_PND_TX_UNDERRUN_CLR) + dev_err(&spi->dev, "TX underrun\n"); + + return IRQ_HANDLED; +} + static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel) { struct s3c64xx_spi_info *sci = sdd->cntrlr_info; @@ -970,7 +999,8 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev) struct s3c64xx_spi_driver_data *sdd; struct s3c64xx_spi_info *sci; struct spi_master *master; - int ret; + int ret, irq; + char clk_name[16]; if (pdev->id < 0) { dev_err(&pdev->dev, @@ -1010,6 +1040,12 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev) return -ENXIO; } + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq); + return irq; + } + master = spi_alloc_master(&pdev->dev, sizeof(struct s3c64xx_spi_driver_data)); if (master == NULL) { @@ -1104,10 +1140,21 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev) INIT_WORK(&sdd->work, s3c64xx_spi_work); INIT_LIST_HEAD(&sdd->queue); + ret = request_irq(irq, s3c64xx_spi_irq, 0, "spi-s3c64xx", sdd); + if (ret != 0) { + dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n", + irq, ret); + goto err8; + } + + writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN | + S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN, + sdd->regs + S3C64XX_SPI_INT_EN); + if (spi_register_master(master)) { dev_err(&pdev->dev, "cannot register SPI master\n"); ret = -EBUSY; - goto err8; + goto err9; } dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d " @@ -1119,6 +1166,8 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev) return 0; +err9: + free_irq(irq, sdd); err8: destroy_workqueue(sdd->workqueue); err7: @@ -1157,6 +1206,10 @@ static int s3c64xx_spi_remove(struct platform_device *pdev) spi_unregister_master(master); + writel(0, sdd->regs + S3C64XX_SPI_INT_EN); + + free_irq(platform_get_irq(pdev, 0), sdd); + destroy_workqueue(sdd->workqueue); clk_disable(sdd->src_clk); |