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authorShenwei Wang <shenwei.wang@nxp.com>2022-10-27 08:08:59 -0500
committerLinus Walleij <linus.walleij@linaro.org>2022-11-08 11:26:00 +0100
commitf60c9eac54af28d7b5651fe49944bfd5098550e6 (patch)
treedf50067dd98c830f467b6c764ff4f53631a09fda
parent7c3ccedaf7a7b0260e8ac128f14d6564da8393fd (diff)
downloadlinux-f60c9eac54af28d7b5651fe49944bfd5098550e6.tar.bz2
gpio: mxc: enable pad wakeup on i.MX8x platforms
On i.MX8QM/QXP/DXL SoCs, even a GPIO is selected as the wakeup source, the GPIO block will be powered off when system enters into suspend state. This can greatly reduce the power consumption of suspend state because the whole partition can be shutdown. This is called PAD wakeup feature on i.MX8x platform. This patch adds the noirq suspend/resume hooks and uses the pad wakeup feature as the default wakeup method for GPIO modules on i.MX8QM/QXP/DXL platforms. Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Link: https://lore.kernel.org/r/20221027130859.1444412-6-shenwei.wang@nxp.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r--drivers/gpio/gpio-mxc.c92
1 files changed, 91 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index c871602fc5ba..d5626c572d24 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -24,6 +24,12 @@
#include <linux/of_device.h>
#include <linux/bug.h>
+#define IMX_SCU_WAKEUP_OFF 0
+#define IMX_SCU_WAKEUP_LOW_LVL 4
+#define IMX_SCU_WAKEUP_FALL_EDGE 5
+#define IMX_SCU_WAKEUP_RISE_EDGE 6
+#define IMX_SCU_WAKEUP_HIGH_LVL 7
+
/* device type dependent stuff */
struct mxc_gpio_hwdata {
unsigned dr_reg;
@@ -61,6 +67,9 @@ struct mxc_gpio_port {
u32 both_edges;
struct mxc_gpio_reg_saved gpio_saved_reg;
bool power_off;
+ u32 wakeup_pads;
+ bool is_pad_wakeup;
+ u32 pad_type[32];
const struct mxc_gpio_hwdata *hwdata;
};
@@ -130,6 +139,9 @@ static const struct of_device_id mxc_gpio_dt_ids[] = {
{ .compatible = "fsl,imx31-gpio", .data = &imx31_gpio_hwdata },
{ .compatible = "fsl,imx35-gpio", .data = &imx35_gpio_hwdata },
{ .compatible = "fsl,imx7d-gpio", .data = &imx35_gpio_hwdata },
+ { .compatible = "fsl,imx8dxl-gpio", .data = &imx35_gpio_hwdata },
+ { .compatible = "fsl,imx8qm-gpio", .data = &imx35_gpio_hwdata },
+ { .compatible = "fsl,imx8qxp-gpio", .data = &imx35_gpio_hwdata },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxc_gpio_dt_ids);
@@ -203,6 +215,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
}
writel(1 << gpio_idx, port->base + GPIO_ISR);
+ port->pad_type[gpio_idx] = type;
return 0;
}
@@ -254,6 +267,9 @@ static void mx3_gpio_irq_handler(struct irq_desc *desc)
struct mxc_gpio_port *port = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
+ if (port->is_pad_wakeup)
+ return;
+
chained_irq_enter(chip, desc);
irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR);
@@ -306,11 +322,13 @@ static int gpio_set_wake_irq(struct irq_data *d, u32 enable)
ret = enable_irq_wake(port->irq_high);
else
ret = enable_irq_wake(port->irq);
+ port->wakeup_pads |= (1 << gpio_idx);
} else {
if (port->irq_high && (gpio_idx >= 16))
ret = disable_irq_wake(port->irq_high);
else
ret = disable_irq_wake(port->irq);
+ port->wakeup_pads &= ~(1 << gpio_idx);
}
return ret;
@@ -365,7 +383,6 @@ static int mxc_gpio_probe(struct platform_device *pdev)
return -ENOMEM;
port->dev = &pdev->dev;
-
port->hwdata = device_get_match_data(&pdev->dev);
port->base = devm_platform_ioremap_resource(pdev, 0);
@@ -498,6 +515,78 @@ static void mxc_gpio_restore_regs(struct mxc_gpio_port *port)
writel(port->gpio_saved_reg.dr, port->base + GPIO_DR);
}
+static bool mxc_gpio_generic_config(struct mxc_gpio_port *port,
+ unsigned int offset, unsigned long conf)
+{
+ struct device_node *np = port->dev->of_node;
+
+ if (of_device_is_compatible(np, "fsl,imx8dxl-gpio") ||
+ of_device_is_compatible(np, "fsl,imx8qxp-gpio") ||
+ of_device_is_compatible(np, "fsl,imx8qm-gpio"))
+ return (gpiochip_generic_config(&port->gc, offset, conf) == 0);
+
+ return false;
+}
+
+static bool mxc_gpio_set_pad_wakeup(struct mxc_gpio_port *port, bool enable)
+{
+ unsigned long config;
+ bool ret = false;
+ int i, type;
+
+ static const u32 pad_type_map[] = {
+ IMX_SCU_WAKEUP_OFF, /* 0 */
+ IMX_SCU_WAKEUP_RISE_EDGE, /* IRQ_TYPE_EDGE_RISING */
+ IMX_SCU_WAKEUP_FALL_EDGE, /* IRQ_TYPE_EDGE_FALLING */
+ IMX_SCU_WAKEUP_FALL_EDGE, /* IRQ_TYPE_EDGE_BOTH */
+ IMX_SCU_WAKEUP_HIGH_LVL, /* IRQ_TYPE_LEVEL_HIGH */
+ IMX_SCU_WAKEUP_OFF, /* 5 */
+ IMX_SCU_WAKEUP_OFF, /* 6 */
+ IMX_SCU_WAKEUP_OFF, /* 7 */
+ IMX_SCU_WAKEUP_LOW_LVL, /* IRQ_TYPE_LEVEL_LOW */
+ };
+
+ for (i = 0; i < 32; i++) {
+ if ((port->wakeup_pads & (1 << i))) {
+ type = port->pad_type[i];
+ if (enable)
+ config = pad_type_map[type];
+ else
+ config = IMX_SCU_WAKEUP_OFF;
+ ret |= mxc_gpio_generic_config(port, i, config);
+ }
+ }
+
+ return ret;
+}
+
+static int __maybe_unused mxc_gpio_noirq_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct mxc_gpio_port *port = platform_get_drvdata(pdev);
+
+ if (port->wakeup_pads > 0)
+ port->is_pad_wakeup = mxc_gpio_set_pad_wakeup(port, true);
+
+ return 0;
+}
+
+static int __maybe_unused mxc_gpio_noirq_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct mxc_gpio_port *port = platform_get_drvdata(pdev);
+
+ if (port->wakeup_pads > 0)
+ mxc_gpio_set_pad_wakeup(port, false);
+ port->is_pad_wakeup = false;
+
+ return 0;
+}
+
+static const struct dev_pm_ops mxc_gpio_dev_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mxc_gpio_noirq_suspend, mxc_gpio_noirq_resume)
+};
+
static int mxc_gpio_syscore_suspend(void)
{
struct mxc_gpio_port *port;
@@ -537,6 +626,7 @@ static struct platform_driver mxc_gpio_driver = {
.name = "gpio-mxc",
.of_match_table = mxc_gpio_dt_ids,
.suppress_bind_attrs = true,
+ .pm = &mxc_gpio_dev_pm_ops,
},
.probe = mxc_gpio_probe,
};