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authorGeert Uytterhoeven <geert+renesas@glider.be>2014-09-12 17:15:18 +0400
committerJason Cooper <jason@lakedaemon.net>2014-09-14 10:47:40 +0400
commit705bc96c2c15313c0677607f6e81800f4d2b4534 (patch)
treee87fd69085507172290b8d0f41a7582c8cce9252 /drivers/irqchip
parent36845f1b54edc3237626d48270bbf3bc26d45f4f (diff)
downloadlinux-705bc96c2c15313c0677607f6e81800f4d2b4534.tar.xz
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>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-renesas-intc-irqpin.c38
1 files changed, 34 insertions, 4 deletions
diff --git a/drivers/irqchip/irq-renesas-intc-irqpin.c b/drivers/irqchip/irq-renesas-intc-irqpin.c
index a6b205b72c9b..542e850f4946 100644
--- a/drivers/irqchip/irq-renesas-intc-irqpin.c
+++ b/drivers/irqchip/irq-renesas-intc-irqpin.c
@@ -17,6 +17,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/clk.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/platform_device.h>
@@ -30,6 +31,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_data/irq-renesas-intc-irqpin.h>
+#include <linux/pm_runtime.h>
#define INTC_IRQPIN_MAX 8 /* maximum 8 interrupts per driver instance */
@@ -75,6 +77,7 @@ struct intc_irqpin_priv {
struct platform_device *pdev;
struct irq_chip irq_chip;
struct irq_domain *irq_domain;
+ struct clk *clk;
bool shared_irqs;
u8 shared_irq_mask;
};
@@ -270,6 +273,21 @@ static int intc_irqpin_irq_set_type(struct irq_data *d, unsigned int type)
value ^ INTC_IRQ_SENSE_VALID);
}
+static int intc_irqpin_irq_set_wake(struct irq_data *d, unsigned int on)
+{
+ struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
+
+ if (!p->clk)
+ return 0;
+
+ if (on)
+ clk_enable(p->clk);
+ else
+ clk_disable(p->clk);
+
+ return 0;
+}
+
static irqreturn_t intc_irqpin_irq_handler(int irq, void *dev_id)
{
struct intc_irqpin_irq *i = dev_id;
@@ -346,8 +364,7 @@ static int intc_irqpin_probe(struct platform_device *pdev)
p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL);
if (!p) {
dev_err(dev, "failed to allocate driver data\n");
- ret = -ENOMEM;
- goto err0;
+ return -ENOMEM;
}
/* deal with driver instance configuration */
@@ -365,6 +382,15 @@ static int intc_irqpin_probe(struct platform_device *pdev)
p->pdev = pdev;
platform_set_drvdata(pdev, p);
+ p->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(p->clk)) {
+ dev_warn(dev, "unable to get clock\n");
+ p->clk = NULL;
+ }
+
+ pm_runtime_enable(dev);
+ pm_runtime_get_sync(dev);
+
/* get hold of manadatory IOMEM */
for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
io[k] = platform_get_resource(pdev, IORESOURCE_MEM, k);
@@ -456,7 +482,8 @@ static int intc_irqpin_probe(struct platform_device *pdev)
irq_chip->irq_mask = disable_fn;
irq_chip->irq_unmask = enable_fn;
irq_chip->irq_set_type = intc_irqpin_irq_set_type;
- irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
+ irq_chip->irq_set_wake = intc_irqpin_irq_set_wake;
+ irq_chip->flags = IRQCHIP_MASK_ON_SUSPEND;
p->irq_domain = irq_domain_add_simple(dev->of_node,
p->number_of_irqs,
@@ -508,6 +535,8 @@ static int intc_irqpin_probe(struct platform_device *pdev)
err1:
irq_domain_remove(p->irq_domain);
err0:
+ pm_runtime_put(dev);
+ pm_runtime_disable(dev);
return ret;
}
@@ -516,7 +545,8 @@ static int intc_irqpin_remove(struct platform_device *pdev)
struct intc_irqpin_priv *p = platform_get_drvdata(pdev);
irq_domain_remove(p->irq_domain);
-
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
return 0;
}