blob: aef86af62a46e9cdba739e090f11b4540519b6b8 [file] [log] [blame]
From d1366b19af1d50879f0d34c3633f012e209b3938 Mon Sep 17 00:00:00 2001
From: Hien Dang <hien.dang.eb@renesas.com>
Date: Mon, 5 Feb 2018 04:15:02 +0900
Subject: [PATCH 1127/1795] gpio: gpio-rcar: Support S2RAM
This patch adds an implementation that saves and restores the state of
GPIO configuration on suspend and resume.
Signed-off-by: Hien Dang <hien.dang.eb@renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[Modify structure of the bank info to simplify a saving registers]
[Remove DEV_PM_OPS macro]
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Tested-by: Nguyen Viet Dung <dung.nguyen.aj@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit 51750fb167a054684a18c20e0e78f7f65b12c985)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Conflicts:
drivers/gpio/gpio-rcar.c
---
drivers/gpio/gpio-rcar.c | 60 ++++++++++++++++++++++++++++++++++++++--
1 file changed, 58 insertions(+), 2 deletions(-)
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 4a0dc495efcd..21d55d361e8a 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -30,6 +30,16 @@
#include <linux/spinlock.h>
#include <linux/slab.h>
+struct gpio_rcar_bank_info {
+ u32 iointsel;
+ u32 inoutsel;
+ u32 outdt;
+ u32 posneg;
+ u32 edglevel;
+ u32 bothedge;
+ u32 intmsk;
+};
+
struct gpio_rcar_priv {
void __iomem *base;
spinlock_t lock;
@@ -39,6 +49,7 @@ struct gpio_rcar_priv {
unsigned int irq_parent;
atomic_t wakeup_path;
bool has_both_edge_trigger;
+ struct gpio_rcar_bank_info bank_info;
};
#define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */
@@ -512,17 +523,62 @@ static int gpio_rcar_remove(struct platform_device *pdev)
return 0;
}
-static int __maybe_unused gpio_rcar_suspend(struct device *dev)
+#ifdef CONFIG_PM_SLEEP
+static int gpio_rcar_suspend(struct device *dev)
{
struct gpio_rcar_priv *p = dev_get_drvdata(dev);
+ p->bank_info.iointsel = gpio_rcar_read(p, IOINTSEL);
+ p->bank_info.inoutsel = gpio_rcar_read(p, INOUTSEL);
+ p->bank_info.outdt = gpio_rcar_read(p, OUTDT);
+ p->bank_info.intmsk = gpio_rcar_read(p, INTMSK);
+ p->bank_info.posneg = gpio_rcar_read(p, POSNEG);
+ p->bank_info.edglevel = gpio_rcar_read(p, EDGLEVEL);
+ if (p->has_both_edge_trigger)
+ p->bank_info.bothedge = gpio_rcar_read(p, BOTHEDGE);
+
if (atomic_read(&p->wakeup_path))
device_set_wakeup_path(dev);
return 0;
}
-static SIMPLE_DEV_PM_OPS(gpio_rcar_pm_ops, gpio_rcar_suspend, NULL);
+static int gpio_rcar_resume(struct device *dev)
+{
+ struct gpio_rcar_priv *p = dev_get_drvdata(dev);
+ unsigned int offset;
+ u32 mask;
+
+ for (offset = 0; offset < p->gpio_chip.ngpio; offset++) {
+ mask = BIT(offset);
+ /* I/O pin */
+ if (!(p->bank_info.iointsel & mask)) {
+ if (p->bank_info.inoutsel & mask)
+ gpio_rcar_direction_output(
+ &p->gpio_chip, offset,
+ !!(p->bank_info.outdt & mask));
+ else
+ gpio_rcar_direction_input(&p->gpio_chip,
+ offset);
+ } else {
+ /* Interrupt pin */
+ gpio_rcar_config_interrupt_input_mode(
+ p,
+ offset,
+ !(p->bank_info.posneg & mask),
+ !(p->bank_info.edglevel & mask),
+ !!(p->bank_info.bothedge & mask));
+
+ if (p->bank_info.intmsk & mask)
+ gpio_rcar_write(p, MSKCLR, mask);
+ }
+ }
+
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP*/
+
+static SIMPLE_DEV_PM_OPS(gpio_rcar_pm_ops, gpio_rcar_suspend, gpio_rcar_resume);
static struct platform_driver gpio_rcar_device_driver = {
.probe = gpio_rcar_probe,
--
2.19.0