From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yoshihiro Kaneko Subject: [PATCH/RFT v2] gpio: gpio-rcar: Support S2RAM Date: Sun, 24 Dec 2017 22:37:23 +0900 Message-ID: <1514122643-28838-1-git-send-email-ykaneko0929@gmail.com> Return-path: Received: from mail-pl0-f67.google.com ([209.85.160.67]:41541 "EHLO mail-pl0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751680AbdLXNiJ (ORCPT ); Sun, 24 Dec 2017 08:38:09 -0500 Sender: linux-gpio-owner@vger.kernel.org List-Id: linux-gpio@vger.kernel.org To: linux-gpio@vger.kernel.org Cc: Linus Walleij , Simon Horman , Magnus Damm , Geert Uytterhoeven , linux-renesas-soc@vger.kernel.org From: Hien Dang This patch adds an implementation that saves and restores the state of GPIO configuration on suspend and resume. Signed-off-by: Hien Dang Signed-off-by: Takeshi Kihara [Modify structure of the bank info to simplify a saving registers] Signed-off-by: Yoshihiro Kaneko --- This patch is based on the for-next branch of linux-gpio tree. v2 [Yoshihiro Kaneko] * Modify structure of the bank info as suggested by Geert Uytterhoeven drivers/gpio/gpio-rcar.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c index e76de57..7c7360b 100644 --- a/drivers/gpio/gpio-rcar.c +++ b/drivers/gpio/gpio-rcar.c @@ -31,6 +31,16 @@ #include #include +struct gpio_rcar_bank_info { + u32 iointsel; + u32 inoutsel; + u32 outdt; + u32 active_high_rising_edge; + u32 level_trigger; + u32 both; + u32 intmsk; +}; + struct gpio_rcar_priv { void __iomem *base; spinlock_t lock; @@ -41,6 +51,7 @@ struct gpio_rcar_priv { unsigned int irq_parent; bool has_both_edge_trigger; bool needs_clk; + struct gpio_rcar_bank_info bank_info; }; #define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */ @@ -415,6 +426,63 @@ static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p, unsigned int *npins) return 0; } +#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.active_high_rising_edge = gpio_rcar_read(p, POSNEG); + p->bank_info.level_trigger = gpio_rcar_read(p, EDGLEVEL); + p->bank_info.both = gpio_rcar_read(p, BOTHEDGE); + + return 0; +} + +static int gpio_rcar_resume(struct device *dev) +{ + struct gpio_rcar_priv *p = dev_get_drvdata(dev); + 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); + /* Interrupt pin */ + } else { + gpio_rcar_config_interrupt_input_mode( + p, + offset, + !(p->bank_info.active_high_rising_edge & mask), + !!(p->bank_info.level_trigger & mask), + !!(p->bank_info.both & mask)); + + if (p->bank_info.intmsk & mask) + gpio_rcar_write(p, MSKCLR, mask); + } + } + + return 0; +} + +static SIMPLE_DEV_PM_OPS(gpio_rcar_pm_ops, + gpio_rcar_suspend, gpio_rcar_resume); +#define DEV_PM_OPS (&gpio_rcar_pm_ops) +#else +#define DEV_PM_OPS NULL +#endif /* CONFIG_PM_SLEEP*/ + static int gpio_rcar_probe(struct platform_device *pdev) { struct gpio_rcar_priv *p; @@ -536,6 +604,7 @@ static int gpio_rcar_remove(struct platform_device *pdev) .remove = gpio_rcar_remove, .driver = { .name = "gpio_rcar", + .pm = DEV_PM_OPS, .of_match_table = of_match_ptr(gpio_rcar_of_table), } }; -- 1.9.1