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Commit Message

Krzysztof Kozlowski July 21, 2016, 9:10 a.m. UTC

On Thu, Jul 21, 2016 at 7:15 AM, Ryan <[e-mail]> wrote:
> Hey,
>
> Can i dump the gpio states just before exynos is put to sleep?
>
> What would be the best place to do that? are there any example drivers which
> can do this?

I assume that /sys/kernel/debug/gpio is not sufficient... I got some
old debug code (for 3.10 :) ) for dumping the registers. Feel free to
use it under GPLv2 (derivative work from Linux kernel) - attached. If
you need specific values you would have to decode the data into
something readable.

Best regards,
Krzysztof

Patch

From bfd789387cc67eb34752be4c40e4e494e499bec6 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <[e-mail]>
Date: Thu, 13 Feb 2014 15:03:47 +0100
Subject: [PATCH] pinctrl: exynos: Dump GPIO on suspend and resume

---
 drivers/pinctrl/pinctrl-exynos.c |   27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-exynos.c b/drivers/pinctrl/pinctrl-exynos.c
index 4c84e61f9c44..6931bd024913 100644
--- a/drivers/pinctrl/pinctrl-exynos.c
+++ b/drivers/pinctrl/pinctrl-exynos.c
@@ -613,12 +613,37 @@  static void exynos_pinctrl_suspend_bank(
 	pr_debug("%s: save fltcon1 %#010x\n", bank->name, save->eint_fltcon1);
 }
 
+static void exynos_pinctrl_dump(struct samsung_pinctrl_drv_data *drvdata)
+{
+	struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
+	struct samsung_pin_bank *bank = ctrl->pin_banks;
+	void __iomem *regs = drvdata->virt_base;
+	int i;
+
+	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
+		pr_info("GPIO: %4s %08x: %#010x %#010x %#010x\n",
+			bank->name,
+			bank->pctl_offset,
+			readl(regs + bank->pctl_offset),
+			readl(regs + bank->pctl_offset + 0x04),
+			readl(regs + bank->pctl_offset + 0x08));
+		pr_info("GPIO: %4s %08x: %#010x %#010x %#010x\n",
+			bank->name,
+			bank->pctl_offset,
+			readl(regs + bank->pctl_offset + 0x0c),
+			readl(regs + bank->pctl_offset + 0x10),
+			readl(regs + bank->pctl_offset + 0x14));
+	}
+}
+
 static void exynos_pinctrl_suspend(struct samsung_pinctrl_drv_data *drvdata)
 {
 	struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
 	struct samsung_pin_bank *bank = ctrl->pin_banks;
 	int i;
 
+	exynos_pinctrl_dump(drvdata);
+
 	for (i = 0; i < ctrl->nr_banks; ++i, ++bank)
 		if (bank->eint_type == EINT_TYPE_GPIO)
 			exynos_pinctrl_suspend_bank(drvdata, bank);
@@ -658,6 +683,8 @@  static void exynos_pinctrl_resume(struct samsung_pinctrl_drv_data *drvdata)
 	for (i = 0; i < ctrl->nr_banks; ++i, ++bank)
 		if (bank->eint_type == EINT_TYPE_GPIO)
 			exynos_pinctrl_resume_bank(drvdata, bank);
+
+	exynos_pinctrl_dump(drvdata);
 }
 
 /* pin banks of exynos3250 pin-controller 0 */
-- 
1.7.9.5