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Message-Id: <1406040752-25229-2-git-send-email-lee.jones@linaro.org>
Date: Tue, 22 Jul 2014 15:52:28 +0100
From: Lee Jones <lee.jones@...aro.org>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: lee.jones@...aro.org, kernel@...inux.com, dbaryshkov@...il.com,
Christophe Kerello <christophe.kerello@...com>
Subject: [PATCH 1/5] power: reset: Add restart functionality for STiH41x platforms
This driver adds the restart functionality for STiH415 and STiH416
platforms from STMicroelectronics. This driver registers an
arm_pm_restart function to reset the platform.
Signed-off-by: Christophe Kerello <christophe.kerello@...com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
drivers/power/reset/Kconfig | 6 ++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/st-poweroff.c | 151 ++++++++++++++++++++++++++++++++++++++
3 files changed, 158 insertions(+)
create mode 100644 drivers/power/reset/st-poweroff.c
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 003e4d4..445b330 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -58,6 +58,12 @@ config POWER_RESET_SUN6I
help
Reboot support for the Allwinner A31 SoCs.
+config POWER_RESET_ST
+ bool "ST restart power-off driver"
+ depends on POWER_RESET && ARCH_STI
+ help
+ Power off and reset support for STMicroelectronics boards.
+
config POWER_RESET_VEXPRESS
bool "ARM Versatile Express power-off and reset driver"
depends on ARM || ARM64
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index dde2e8b..aaae990 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
obj-$(CONFIG_POWER_RESET_SUN6I) += sun6i-reboot.o
+obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o
obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o
obj-$(CONFIG_POWER_RESET_XGENE) += xgene-reboot.o
obj-$(CONFIG_POWER_RESET_KEYSTONE) += keystone-reset.o
diff --git a/drivers/power/reset/st-poweroff.c b/drivers/power/reset/st-poweroff.c
new file mode 100644
index 0000000..a0acf25
--- /dev/null
+++ b/drivers/power/reset/st-poweroff.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2014 STMicroelectronics
+ *
+ * Power off Restart driver, used in STMicroelectronics devices.
+ *
+ * Author: Christophe Kerello <christophe.kerello@...com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#include <asm/system_misc.h>
+
+struct reset_syscfg {
+ struct regmap *regmap;
+ /* syscfg used for reset */
+ unsigned int offset_rst;
+ unsigned int mask_rst;
+ /* syscfg used for unmask the reset */
+ unsigned int offset_rst_msk;
+ unsigned int mask_rst_msk;
+};
+
+/* STiH415 */
+#define STIH415_SYSCFG_11 0x2c
+#define STIH415_SYSCFG_15 0x3c
+
+static struct reset_syscfg stih415_reset = {
+ .offset_rst = STIH415_SYSCFG_11,
+ .mask_rst = BIT(0),
+ .offset_rst_msk = STIH415_SYSCFG_15,
+ .mask_rst_msk = BIT(0)
+};
+
+/* STiH416 */
+#define STIH416_SYSCFG_500 0x7d0
+#define STIH416_SYSCFG_504 0x7e0
+
+static struct reset_syscfg stih416_reset = {
+ .offset_rst = STIH416_SYSCFG_500,
+ .mask_rst = BIT(0),
+ .offset_rst_msk = STIH416_SYSCFG_504,
+ .mask_rst_msk = BIT(0)
+};
+
+/* STiH407 */
+#define STIH407_SYSCFG_4000 0x0
+#define STIH407_SYSCFG_4008 0x20
+
+static struct reset_syscfg stih407_reset = {
+ .offset_rst = STIH407_SYSCFG_4000,
+ .mask_rst = BIT(0),
+ .offset_rst_msk = STIH407_SYSCFG_4008,
+ .mask_rst_msk = BIT(0)
+};
+
+/* STiD127 */
+#define STID127_SYSCFG_700 0x0
+#define STID127_SYSCFG_773 0x124
+
+static struct reset_syscfg stid127_reset = {
+ .offset_rst = STID127_SYSCFG_773,
+ .mask_rst = BIT(0),
+ .offset_rst_msk = STID127_SYSCFG_700,
+ .mask_rst_msk = BIT(8)
+};
+
+static struct reset_syscfg *st_restart_syscfg;
+
+static void st_restart(enum reboot_mode reboot_mode, const char *cmd)
+{
+ /* reset syscfg updated */
+ regmap_update_bits(st_restart_syscfg->regmap,
+ st_restart_syscfg->offset_rst,
+ st_restart_syscfg->mask_rst,
+ 0);
+
+ /* unmask the reset */
+ regmap_update_bits(st_restart_syscfg->regmap,
+ st_restart_syscfg->offset_rst_msk,
+ st_restart_syscfg->mask_rst_msk,
+ 0);
+}
+
+static struct of_device_id st_reset_of_match[] = {
+ {
+ .compatible = "st,stih415-restart",
+ .data = (void *)&stih415_reset,
+ }, {
+ .compatible = "st,stih416-restart",
+ .data = (void *)&stih416_reset,
+ }, {
+ .compatible = "st,stih407-restart",
+ .data = (void *)&stih407_reset,
+ }, {
+ .compatible = "st,stid127-restart",
+ .data = (void *)&stid127_reset,
+ },
+ {}
+};
+
+static int st_reset_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *match;
+ struct device *dev = &pdev->dev;
+
+ match = of_match_device(st_reset_of_match, dev);
+ if (!match)
+ return -ENODEV;
+
+ st_restart_syscfg = (struct reset_syscfg *)match->data;
+
+ st_restart_syscfg->regmap =
+ syscon_regmap_lookup_by_phandle(np, "st,syscfg");
+ if (IS_ERR(st_restart_syscfg->regmap)) {
+ dev_err(dev, "No syscfg phandle specified\n");
+ return PTR_ERR(st_restart_syscfg->regmap);
+ }
+
+ arm_pm_restart = st_restart;
+
+ return 0;
+}
+
+static struct platform_driver st_reset_driver = {
+ .probe = st_reset_probe,
+ .driver = {
+ .name = "st_reset",
+ .of_match_table = st_reset_of_match,
+ },
+};
+
+static int __init st_reset_init(void)
+{
+ return platform_driver_register(&st_reset_driver);
+}
+
+device_initcall(st_reset_init);
+
+MODULE_AUTHOR("Christophe Kerello <christophe.kerello@...com>");
+MODULE_DESCRIPTION("STMicroelectronics Power off Restart driver");
+MODULE_LICENSE("GPL v2");
--
1.8.3.2
--
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