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irqchip: renesas-intc-irqpin: Add minimal runtime PM support
This is just enough to let pm_clk_*() enable the functional clock, and manage it for suspend/resume, if present. Before, it was assumed enabled by the bootloader or reset state. To prevent the clock from being disabled while the module is needed for wake-up, implement irq_chip.irq_set_wake(), which increments/decrements the clock's enable_count when needed. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lkml.kernel.org/r/1410527720-18061-3-git-send-email-geert+renesas@glider.be Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
parent
36845f1b54
commit
705bc96c2c
1 changed files with 34 additions and 4 deletions
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@ -17,6 +17,7 @@
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/clk.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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@ -30,6 +31,7 @@
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_data/irq-renesas-intc-irqpin.h>
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#include <linux/pm_runtime.h>
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#define INTC_IRQPIN_MAX 8 /* maximum 8 interrupts per driver instance */
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@ -75,6 +77,7 @@ struct intc_irqpin_priv {
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struct platform_device *pdev;
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struct irq_chip irq_chip;
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struct irq_domain *irq_domain;
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struct clk *clk;
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bool shared_irqs;
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u8 shared_irq_mask;
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};
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@ -270,6 +273,21 @@ static int intc_irqpin_irq_set_type(struct irq_data *d, unsigned int type)
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value ^ INTC_IRQ_SENSE_VALID);
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}
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static int intc_irqpin_irq_set_wake(struct irq_data *d, unsigned int on)
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{
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struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
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if (!p->clk)
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return 0;
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if (on)
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clk_enable(p->clk);
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else
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clk_disable(p->clk);
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return 0;
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}
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static irqreturn_t intc_irqpin_irq_handler(int irq, void *dev_id)
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{
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struct intc_irqpin_irq *i = dev_id;
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@ -346,8 +364,7 @@ static int intc_irqpin_probe(struct platform_device *pdev)
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p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL);
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if (!p) {
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dev_err(dev, "failed to allocate driver data\n");
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ret = -ENOMEM;
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goto err0;
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return -ENOMEM;
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}
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/* deal with driver instance configuration */
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@ -365,6 +382,15 @@ static int intc_irqpin_probe(struct platform_device *pdev)
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p->pdev = pdev;
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platform_set_drvdata(pdev, p);
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p->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(p->clk)) {
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dev_warn(dev, "unable to get clock\n");
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p->clk = NULL;
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}
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pm_runtime_enable(dev);
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pm_runtime_get_sync(dev);
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/* get hold of manadatory IOMEM */
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for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
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io[k] = platform_get_resource(pdev, IORESOURCE_MEM, k);
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@ -456,7 +482,8 @@ static int intc_irqpin_probe(struct platform_device *pdev)
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irq_chip->irq_mask = disable_fn;
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irq_chip->irq_unmask = enable_fn;
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irq_chip->irq_set_type = intc_irqpin_irq_set_type;
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irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
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irq_chip->irq_set_wake = intc_irqpin_irq_set_wake;
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irq_chip->flags = IRQCHIP_MASK_ON_SUSPEND;
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p->irq_domain = irq_domain_add_simple(dev->of_node,
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p->number_of_irqs,
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@ -508,6 +535,8 @@ static int intc_irqpin_probe(struct platform_device *pdev)
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err1:
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irq_domain_remove(p->irq_domain);
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err0:
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pm_runtime_put(dev);
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pm_runtime_disable(dev);
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return ret;
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}
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@ -516,7 +545,8 @@ static int intc_irqpin_remove(struct platform_device *pdev)
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struct intc_irqpin_priv *p = platform_get_drvdata(pdev);
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irq_domain_remove(p->irq_domain);
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pm_runtime_put(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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