This patch enables suspend and resume mode for the power management, and
it is based on Josef Ahmad's previous work.
Reviewed-by: Hock Leong Kweh <hock.leong.k...@intel.com>
Reviewed-by: Shevchenko, Andriy <andriy.shevche...@intel.com>
Signed-off-by: Weike Chen <alvin.c...@intel.com>
---
drivers/gpio/gpio-dwapb.c | 102 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 102 insertions(+)
diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 6db7501..a103def 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -54,6 +54,7 @@ struct dwapb_gpio_port {
struct bgpio_chip bgc;
bool is_registered;
struct dwapb_gpio *gpio;
+ unsigned int idx;
};
struct dwapb_gpio {
@@ -376,6 +377,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
port = &gpio->ports[offs];
port->gpio = gpio;
+ port->idx = pp->idx;
dat = gpio->regs + GPIO_EXT_PORTA + (pp->idx * GPIO_EXT_PORT_SIZE);
set = gpio->regs + GPIO_SWPORTA_DR + (pp->idx * GPIO_SWPORT_DR_SIZE);
@@ -594,10 +596,110 @@ static const struct of_device_id dwapb_of_match[] = {
};
MODULE_DEVICE_TABLE(of, dwapb_of_match);
+#ifdef CONFIG_PM_SLEEP
+/* Store GPIO context across system-wide suspend/resume transitions */
+static struct dwapb_context {
+ u32 data[DWAPB_MAX_PORTS];
+ u32 dir[DWAPB_MAX_PORTS];
+ u32 ext[DWAPB_MAX_PORTS];
+ u32 int_en;
+ u32 int_mask;
+ u32 int_type;
+ u32 int_pol;
+ u32 int_deb;
+} dwapb_context;
+
+static int dwapb_gpio_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
+ struct bgpio_chip *bgc = &gpio->ports[0].bgc;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&bgc->lock, flags);
+ for (i = 0; i < gpio->nr_ports; i++) {
+ unsigned int offset;
+ unsigned int idx = gpio->ports[i].idx;
+
+ offset = GPIO_SWPORTA_DDR + (idx * GPIO_SWPORT_DDR_SIZE);
+ dwapb_context.dir[i] = dwapb_read(gpio, offset);
+
+ offset = GPIO_SWPORTA_DR + (idx * GPIO_SWPORT_DR_SIZE);
+ dwapb_context.data[i] = dwapb_read(gpio, offset);
+
+ offset = GPIO_EXT_PORTA + (idx * GPIO_EXT_PORT_SIZE);
+ dwapb_context.ext[i] = dwapb_read(gpio, offset);
+
+ if (idx == 0) {
+ dwapb_context.int_mask = dwapb_read(gpio, GPIO_INTMASK);
+ dwapb_context.int_en = dwapb_read(gpio, GPIO_INTEN);
+ dwapb_context.int_pol =
+ dwapb_read(gpio, GPIO_INT_POLARITY);
+ dwapb_context.int_type =
+ dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
+ dwapb_context.int_deb =
+ dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
+
+ /* Mask out interrupts */
+ dwapb_write(gpio, GPIO_INTMASK, 0xffffffff);
+ }
+ }
+ spin_unlock_irqrestore(&bgc->lock, flags);
+
+ return 0;
+}
+
+static int dwapb_gpio_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
+ struct bgpio_chip *bgc = &gpio->ports[0].bgc;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&bgc->lock, flags);
+ for (i = 0; i < gpio->nr_ports; i++) {
+ unsigned int offset;
+ unsigned int idx = gpio->ports[i].idx;
+
+ offset = GPIO_SWPORTA_DR + (idx * GPIO_SWPORT_DR_SIZE);
+ dwapb_write(gpio, offset, dwapb_context.data[i]);
+
+ offset = GPIO_SWPORTA_DDR + (idx * GPIO_SWPORT_DDR_SIZE);
+ dwapb_write(gpio, offset, dwapb_context.dir[i]);
+
+ offset = GPIO_EXT_PORTA + (idx * GPIO_EXT_PORT_SIZE);
+ dwapb_write(gpio, offset, dwapb_context.ext[i]);
+
+ if (idx == 0) {
+ dwapb_write(gpio, GPIO_INTTYPE_LEVEL,
+ dwapb_context.int_type);
+ dwapb_write(gpio, GPIO_INT_POLARITY,
+ dwapb_context.int_pol);
+ dwapb_write(gpio, GPIO_PORTA_DEBOUNCE,
+ dwapb_context.int_deb);
+ dwapb_write(gpio, GPIO_INTEN, dwapb_context.int_en);
+ dwapb_write(gpio, GPIO_INTMASK, dwapb_context.int_mask);
+
+ /* Clear out spurious interrupts */
+ dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff);
+ }
+ }
+ spin_unlock_irqrestore(&bgc->lock, flags);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend,
+ dwapb_gpio_resume);
+
static struct platform_driver dwapb_gpio_driver = {
.driver = {
.name = "gpio-dwapb",
.owner = THIS_MODULE,
+ .pm = &dwapb_gpio_pm_ops,
.of_match_table = of_match_ptr(dwapb_of_match),
},
.probe = dwapb_gpio_probe,
--
1.7.9.5
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