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path: root/drivers/gpio/gpio-mxc.c
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Diffstat (limited to 'drivers/gpio/gpio-mxc.c')
-rw-r--r--drivers/gpio/gpio-mxc.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 2f2829966d4c..995cf0b9e0b1 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -45,6 +45,15 @@ struct mxc_gpio_hwdata {
unsigned fall_edge;
};
+struct mxc_gpio_reg_saved {
+ u32 icr1;
+ u32 icr2;
+ u32 imr;
+ u32 gdir;
+ u32 edge_sel;
+ u32 dr;
+};
+
struct mxc_gpio_port {
struct list_head node;
void __iomem *base;
@@ -55,6 +64,8 @@ struct mxc_gpio_port {
struct gpio_chip gc;
struct device *dev;
u32 both_edges;
+ struct mxc_gpio_reg_saved gpio_saved_reg;
+ bool power_off;
};
static struct mxc_gpio_hwdata imx1_imx21_gpio_hwdata = {
@@ -143,6 +154,7 @@ static const struct of_device_id mxc_gpio_dt_ids[] = {
{ .compatible = "fsl,imx21-gpio", .data = &mxc_gpio_devtype[IMX21_GPIO], },
{ .compatible = "fsl,imx31-gpio", .data = &mxc_gpio_devtype[IMX31_GPIO], },
{ .compatible = "fsl,imx35-gpio", .data = &mxc_gpio_devtype[IMX35_GPIO], },
+ { .compatible = "fsl,imx7d-gpio", .data = &mxc_gpio_devtype[IMX35_GPIO], },
{ /* sentinel */ }
};
@@ -434,6 +446,9 @@ static int mxc_gpio_probe(struct platform_device *pdev)
return err;
}
+ if (of_device_is_compatible(np, "fsl,imx7d-gpio"))
+ port->power_off = true;
+
/* disable the interrupt and clear the status */
writel(0, port->base + GPIO_IMR);
writel(~0, port->base + GPIO_ISR);
@@ -497,6 +512,8 @@ static int mxc_gpio_probe(struct platform_device *pdev)
list_add_tail(&port->node, &mxc_gpio_ports);
+ platform_set_drvdata(pdev, port);
+
return 0;
out_irqdomain_remove:
@@ -507,11 +524,67 @@ out_bgio:
return err;
}
+static void mxc_gpio_save_regs(struct mxc_gpio_port *port)
+{
+ if (!port->power_off)
+ return;
+
+ port->gpio_saved_reg.icr1 = readl(port->base + GPIO_ICR1);
+ port->gpio_saved_reg.icr2 = readl(port->base + GPIO_ICR2);
+ port->gpio_saved_reg.imr = readl(port->base + GPIO_IMR);
+ port->gpio_saved_reg.gdir = readl(port->base + GPIO_GDIR);
+ port->gpio_saved_reg.edge_sel = readl(port->base + GPIO_EDGE_SEL);
+ port->gpio_saved_reg.dr = readl(port->base + GPIO_DR);
+}
+
+static void mxc_gpio_restore_regs(struct mxc_gpio_port *port)
+{
+ if (!port->power_off)
+ return;
+
+ writel(port->gpio_saved_reg.icr1, port->base + GPIO_ICR1);
+ writel(port->gpio_saved_reg.icr2, port->base + GPIO_ICR2);
+ writel(port->gpio_saved_reg.imr, port->base + GPIO_IMR);
+ writel(port->gpio_saved_reg.gdir, port->base + GPIO_GDIR);
+ writel(port->gpio_saved_reg.edge_sel, port->base + GPIO_EDGE_SEL);
+ writel(port->gpio_saved_reg.dr, port->base + GPIO_DR);
+}
+
+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);
+
+ mxc_gpio_save_regs(port);
+ clk_disable_unprepare(port->clk);
+
+ 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);
+ int ret;
+
+ ret = clk_prepare_enable(port->clk);
+ if (ret)
+ return ret;
+ mxc_gpio_restore_regs(port);
+
+ 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 struct platform_driver mxc_gpio_driver = {
.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,
.id_table = mxc_gpio_devtype,