diff options
Diffstat (limited to 'drivers/spi/spi-pxa2xx.c')
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 73 |
1 files changed, 67 insertions, 6 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index c3d78073d1ad..7f8f939835fd 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -30,6 +30,7 @@ #include <linux/gpio.h> #include <linux/slab.h> #include <linux/clk.h> +#include <linux/pm_runtime.h> #include <asm/io.h> #include <asm/irq.h> @@ -417,10 +418,20 @@ static irqreturn_t ssp_int(int irq, void *dev_id) { struct driver_data *drv_data = dev_id; void __iomem *reg = drv_data->ioaddr; - u32 sccr1_reg = read_SSCR1(reg); + u32 sccr1_reg; u32 mask = drv_data->mask_sr; u32 status; + /* + * The IRQ might be shared with other peripherals so we must first + * check that are we RPM suspended or not. If we are we assume that + * the IRQ was not for us (we shouldn't be RPM suspended when the + * interrupt is enabled). + */ + if (pm_runtime_suspended(&drv_data->pdev->dev)) + return IRQ_NONE; + + sccr1_reg = read_SSCR1(reg); status = read_SSSR(reg); /* Ignore possible writes if we don't need to write */ @@ -678,6 +689,27 @@ static int pxa2xx_spi_transfer_one_message(struct spi_master *master, return 0; } +static int pxa2xx_spi_prepare_transfer(struct spi_master *master) +{ + struct driver_data *drv_data = spi_master_get_devdata(master); + + pm_runtime_get_sync(&drv_data->pdev->dev); + return 0; +} + +static int pxa2xx_spi_unprepare_transfer(struct spi_master *master) +{ + struct driver_data *drv_data = spi_master_get_devdata(master); + + /* Disable the SSP now */ + write_SSCR0(read_SSCR0(drv_data->ioaddr) & ~SSCR0_SSE, + drv_data->ioaddr); + + pm_runtime_mark_last_busy(&drv_data->pdev->dev); + pm_runtime_put_autosuspend(&drv_data->pdev->dev); + return 0; +} + static int setup_cs(struct spi_device *spi, struct chip_data *chip, struct pxa2xx_spi_chip *chip_info) { @@ -915,6 +947,8 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) master->cleanup = cleanup; master->setup = setup; master->transfer_one_message = pxa2xx_spi_transfer_one_message; + master->prepare_transfer_hardware = pxa2xx_spi_prepare_transfer; + master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer; drv_data->ssp_type = ssp->type; drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1], DMA_ALIGNMENT); @@ -980,6 +1014,11 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) goto out_error_clock_enabled; } + pm_runtime_set_autosuspend_delay(&pdev->dev, 50); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + return status; out_error_clock_enabled: @@ -1002,6 +1041,8 @@ static int pxa2xx_spi_remove(struct platform_device *pdev) return 0; ssp = drv_data->ssp; + pm_runtime_get_sync(&pdev->dev); + /* Disable the SSP at the peripheral and SOC level */ write_SSCR0(0, drv_data->ioaddr); clk_disable_unprepare(ssp->clk); @@ -1010,6 +1051,9 @@ static int pxa2xx_spi_remove(struct platform_device *pdev) if (drv_data->master_info->enable_dma) pxa2xx_spi_dma_release(drv_data); + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + /* Release IRQ */ free_irq(ssp->irq, drv_data); @@ -1069,20 +1113,37 @@ static int pxa2xx_spi_resume(struct device *dev) return 0; } +#endif + +#ifdef CONFIG_PM_RUNTIME +static int pxa2xx_spi_runtime_suspend(struct device *dev) +{ + struct driver_data *drv_data = dev_get_drvdata(dev); + + clk_disable_unprepare(drv_data->ssp->clk); + return 0; +} + +static int pxa2xx_spi_runtime_resume(struct device *dev) +{ + struct driver_data *drv_data = dev_get_drvdata(dev); + + clk_prepare_enable(drv_data->ssp->clk); + return 0; +} +#endif static const struct dev_pm_ops pxa2xx_spi_pm_ops = { - .suspend = pxa2xx_spi_suspend, - .resume = pxa2xx_spi_resume, + SET_SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend, pxa2xx_spi_resume) + SET_RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend, + pxa2xx_spi_runtime_resume, NULL) }; -#endif static struct platform_driver driver = { .driver = { .name = "pxa2xx-spi", .owner = THIS_MODULE, -#ifdef CONFIG_PM .pm = &pxa2xx_spi_pm_ops, -#endif }, .probe = pxa2xx_spi_probe, .remove = pxa2xx_spi_remove, |