diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/amba/bus.c | 57 | ||||
| -rw-r--r-- | drivers/spi/spi-pl022.c | 80 |
2 files changed, 102 insertions, 35 deletions
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c index d74926e0939..84bdaace56c 100644 --- a/drivers/amba/bus.c +++ b/drivers/amba/bus.c @@ -365,6 +365,40 @@ static int amba_pm_restore_noirq(struct device *dev) #endif /* !CONFIG_HIBERNATE_CALLBACKS */ +#ifdef CONFIG_PM_RUNTIME +/* + * Hooks to provide runtime PM of the pclk (bus clock). It is safe to + * enable/disable the bus clock at runtime PM suspend/resume as this + * does not result in loss of context. However, disabling vcore power + * would do, so we leave that to the driver. + */ +static int amba_pm_runtime_suspend(struct device *dev) +{ + struct amba_device *pcdev = to_amba_device(dev); + int ret = pm_generic_runtime_suspend(dev); + + if (ret == 0 && dev->driver) + clk_disable(pcdev->pclk); + + return ret; +} + +static int amba_pm_runtime_resume(struct device *dev) +{ + struct amba_device *pcdev = to_amba_device(dev); + int ret; + + if (dev->driver) { + ret = clk_enable(pcdev->pclk); + /* Failure is probably fatal to the system, but... */ + if (ret) + return ret; + } + + return pm_generic_runtime_resume(dev); +} +#endif + #ifdef CONFIG_PM static const struct dev_pm_ops amba_pm = { @@ -383,8 +417,8 @@ static const struct dev_pm_ops amba_pm = { .poweroff_noirq = amba_pm_poweroff_noirq, .restore_noirq = amba_pm_restore_noirq, SET_RUNTIME_PM_OPS( - pm_generic_runtime_suspend, - pm_generic_runtime_resume, + amba_pm_runtime_suspend, + amba_pm_runtime_resume, pm_generic_runtime_idle ) }; @@ -494,10 +528,18 @@ static int amba_probe(struct device *dev) if (ret) break; + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + ret = pcdrv->probe(pcdev, id); if (ret == 0) break; + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); + pm_runtime_put_noidle(dev); + amba_put_disable_pclk(pcdev); amba_put_disable_vcore(pcdev); } while (0); @@ -509,7 +551,16 @@ static int amba_remove(struct device *dev) { struct amba_device *pcdev = to_amba_device(dev); struct amba_driver *drv = to_amba_driver(dev->driver); - int ret = drv->remove(pcdev); + int ret; + + pm_runtime_get_sync(dev); + ret = drv->remove(pcdev); + pm_runtime_put_noidle(dev); + + /* Undo the runtime PM settings in amba_probe() */ + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); + pm_runtime_put_noidle(dev); amba_put_disable_pclk(pcdev); amba_put_disable_vcore(pcdev); diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c index 730b4a37b82..078338f5948 100644 --- a/drivers/spi/spi-pl022.c +++ b/drivers/spi/spi-pl022.c @@ -515,9 +515,6 @@ static void giveback(struct pl022 *pl022) if (msg->complete) msg->complete(msg->context); /* This message is completed, so let's turn off the clocks & power */ - clk_disable(pl022->clk); - amba_pclk_disable(pl022->adev); - amba_vcore_disable(pl022->adev); pm_runtime_put(&pl022->adev->dev); } @@ -1545,9 +1542,6 @@ static void pump_messages(struct work_struct *work) * (poll/interrupt/DMA) */ pm_runtime_get_sync(&pl022->adev->dev); - amba_vcore_enable(pl022->adev); - amba_pclk_enable(pl022->adev); - clk_enable(pl022->clk); restore_state(pl022); flush(pl022); @@ -2186,8 +2180,6 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) } printk(KERN_INFO "pl022: mapped registers from 0x%08x to %p\n", adev->res.start, pl022->virtbase); - pm_runtime_enable(dev); - pm_runtime_resume(dev); pl022->clk = clk_get(&adev->dev, NULL); if (IS_ERR(pl022->clk)) { @@ -2195,7 +2187,6 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) dev_err(&adev->dev, "could not retrieve SSP/SPI bus clock\n"); goto err_no_clk; } - /* Disable SSP */ writew((readw(SSP_CR1(pl022->virtbase)) & (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); @@ -2235,12 +2226,9 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) goto err_spi_register; } dev_dbg(dev, "probe succeeded\n"); - /* - * Disable the silicon block pclk and any voltage domain and just - * power it up and clock it when it's needed - */ - amba_pclk_disable(adev); - amba_vcore_disable(adev); + + /* let runtime pm put suspend */ + pm_runtime_put(dev); return 0; err_spi_register: @@ -2249,7 +2237,6 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) destroy_queue(pl022); pl022_dma_remove(pl022); free_irq(adev->irq[0], pl022); - pm_runtime_disable(&adev->dev); err_no_irq: clk_put(pl022->clk); err_no_clk: @@ -2271,6 +2258,12 @@ pl022_remove(struct amba_device *adev) if (!pl022) return 0; + /* + * undo pm_runtime_put() in probe. I assume that we're not + * accessing the primecell here. + */ + pm_runtime_get_noresume(&adev->dev); + /* Remove the queue */ if (destroy_queue(pl022) != 0) dev_err(&adev->dev, "queue remove failed\n"); @@ -2288,10 +2281,10 @@ pl022_remove(struct amba_device *adev) return 0; } -#ifdef CONFIG_PM -static int pl022_suspend(struct amba_device *adev, pm_message_t state) +#ifdef CONFIG_SUSPEND +static int pl011_suspend(struct device *dev) { - struct pl022 *pl022 = amba_get_drvdata(adev); + struct pl022 *pl022 = dev_get_drvdata(dev); int status = 0; status = stop_queue(pl022); @@ -2300,34 +2293,58 @@ static int pl022_suspend(struct amba_device *adev, pm_message_t state) return status; } - amba_vcore_enable(adev); - amba_pclk_enable(adev); + amba_vcore_enable(pl022->adev); + amba_pclk_enable(pl022->adev); load_ssp_default_config(pl022); - amba_pclk_disable(adev); - amba_vcore_disable(adev); + amba_pclk_disable(pl022->adev); + amba_vcore_disable(pl022->adev); dev_dbg(&adev->dev, "suspended\n"); return 0; } -static int pl022_resume(struct amba_device *adev) +static int pl022_resume(struct device *dev) { - struct pl022 *pl022 = amba_get_drvdata(adev); + struct pl022 *pl022 = dev_get_drvdata(dev); int status = 0; /* Start the queue running */ status = start_queue(pl022); if (status) - dev_err(&adev->dev, "problem starting queue (%d)\n", status); + dev_err(dev, "problem starting queue (%d)\n", status); else - dev_dbg(&adev->dev, "resumed\n"); + dev_dbg(dev, "resumed\n"); return status; } -#else -#define pl022_suspend NULL -#define pl022_resume NULL #endif /* CONFIG_PM */ +#ifdef CONFIG_PM_RUNTIME +static int pl022_runtime_suspend(struct device *dev) +{ + struct pl022 *pl022 = dev_get_drvdata(dev); + + clk_disable(pl022->clk); + amba_vcore_disable(pl022->adev); + + return 0; +} + +static int pl022_runtime_resume(struct device *dev) +{ + struct pl022 *pl022 = dev_get_drvdata(dev); + + amba_vcore_enable(pl022->adev); + clk_enable(pl022->clk); + + return 0; +} +#endif + +static const struct dev_pm_ops pl022_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pl022_suspend, pl022_resume) + SET_RUNTIME_PM_OPS(pl022_runtime_suspend, pl022_runtime_resume, NULL) +}; + static struct vendor_data vendor_arm = { .fifodepth = 8, .max_bpw = 16, @@ -2407,12 +2424,11 @@ static struct amba_id pl022_ids[] = { static struct amba_driver pl022_driver = { .drv = { .name = "ssp-pl022", + .pm = &pl022_dev_pm_ops, }, .id_table = pl022_ids, .probe = pl022_probe, .remove = __devexit_p(pl022_remove), - .suspend = pl022_suspend, - .resume = pl022_resume, }; |