mirror of
https://github.com/Ysurac/openmptcprouter.git
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160 lines
4.9 KiB
Diff
160 lines
4.9 KiB
Diff
From 559614ab0ae2c85596218226f095be36c12cf0fa Mon Sep 17 00:00:00 2001
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From: Josef Friedl <josef.friedl@speed.at>
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Date: Wed, 3 Jul 2019 12:24:52 +0200
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Subject: [PATCH] power: reset: add driver for mt6323 poweroff
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add poweroff driver for mt6323 and make Makefile and Kconfig-Entries
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Suggested-by: Frank Wunderlich <frank-w@public-files.de>
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Signed-off-by: Josef Friedl <josef.friedl@speed.at>
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Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
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Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
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---
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changes since v6: none
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changes since v5: split out mfd/mt6397/core.h
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changes since v4: none
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changes since v3: none
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changes since v2: none (=v2 part 5)
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---
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drivers/power/reset/Kconfig | 10 +++
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drivers/power/reset/Makefile | 1 +
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drivers/power/reset/mt6323-poweroff.c | 97 +++++++++++++++++++++++++++
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3 files changed, 108 insertions(+)
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create mode 100644 drivers/power/reset/mt6323-poweroff.c
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diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
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index a564237278ff..c721939767eb 100644
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--- a/drivers/power/reset/Kconfig
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+++ b/drivers/power/reset/Kconfig
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@@ -140,6 +140,16 @@ config POWER_RESET_LTC2952
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This driver supports an external powerdown trigger and board power
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down via the LTC2952. Bindings are made in the device tree.
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+config POWER_RESET_MT6323
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+ bool "MediaTek MT6323 power-off driver"
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+ depends on MFD_MT6397
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+ help
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+ The power-off driver is responsible for externally shutdown down
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+ the power of a remote MediaTek SoC MT6323 is connected to through
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+ controlling a tiny circuit BBPU inside MT6323 RTC.
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+
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+ Say Y if you have a board where MT6323 could be found.
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+
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config POWER_RESET_QNAP
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bool "QNAP power-off driver"
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depends on OF_GPIO && PLAT_ORION
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diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
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index 85da3198e4e0..da37f8b851dc 100644
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--- a/drivers/power/reset/Makefile
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+++ b/drivers/power/reset/Makefile
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@@ -11,6 +11,7 @@ obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
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obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
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obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
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obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
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+obj-$(CONFIG_POWER_RESET_MT6323) += mt6323-poweroff.o
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obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o
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obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
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obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
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diff --git a/drivers/power/reset/mt6323-poweroff.c b/drivers/power/reset/mt6323-poweroff.c
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new file mode 100644
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index 000000000000..1caf43d9e46d
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--- /dev/null
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+++ b/drivers/power/reset/mt6323-poweroff.c
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@@ -0,0 +1,97 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * Power off through MediaTek PMIC
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+ *
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+ * Copyright (C) 2018 MediaTek Inc.
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+ *
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+ * Author: Sean Wang <sean.wang@mediatek.com>
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+ *
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+ */
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+
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+#include <linux/err.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/platform_device.h>
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+#include <linux/mfd/mt6397/core.h>
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+#include <linux/mfd/mt6397/rtc.h>
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+
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+struct mt6323_pwrc {
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+ struct device *dev;
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+ struct regmap *regmap;
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+ u32 base;
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+};
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+
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+static struct mt6323_pwrc *mt_pwrc;
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+
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+static void mt6323_do_pwroff(void)
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+{
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+ struct mt6323_pwrc *pwrc = mt_pwrc;
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+ unsigned int val;
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+ int ret;
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+
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+ regmap_write(pwrc->regmap, pwrc->base + RTC_BBPU, RTC_BBPU_KEY);
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+ regmap_write(pwrc->regmap, pwrc->base + RTC_WRTGR, 1);
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+
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+ ret = regmap_read_poll_timeout(pwrc->regmap,
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+ pwrc->base + RTC_BBPU, val,
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+ !(val & RTC_BBPU_CBUSY),
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+ MTK_RTC_POLL_DELAY_US,
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+ MTK_RTC_POLL_TIMEOUT);
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+ if (ret)
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+ dev_err(pwrc->dev, "failed to write BBPU: %d\n", ret);
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+
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+ /* Wait some time until system down, otherwise, notice with a warn */
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+ mdelay(1000);
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+
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+ WARN_ONCE(1, "Unable to power off system\n");
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+}
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+
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+static int mt6323_pwrc_probe(struct platform_device *pdev)
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+{
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+ struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
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+ struct mt6323_pwrc *pwrc;
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+ struct resource *res;
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+
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+ pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
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+ if (!pwrc)
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+ return -ENOMEM;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ pwrc->base = res->start;
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+ pwrc->regmap = mt6397_chip->regmap;
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+ pwrc->dev = &pdev->dev;
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+ mt_pwrc = pwrc;
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+
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+ pm_power_off = &mt6323_do_pwroff;
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+
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+ return 0;
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+}
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+
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+static int mt6323_pwrc_remove(struct platform_device *pdev)
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+{
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+ if (pm_power_off == &mt6323_do_pwroff)
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+ pm_power_off = NULL;
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+
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+ return 0;
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+}
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+
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+static const struct of_device_id mt6323_pwrc_dt_match[] = {
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+ { .compatible = "mediatek,mt6323-pwrc" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, mt6323_pwrc_dt_match);
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+
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+static struct platform_driver mt6323_pwrc_driver = {
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+ .probe = mt6323_pwrc_probe,
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+ .remove = mt6323_pwrc_remove,
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+ .driver = {
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+ .name = "mt6323-pwrc",
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+ .of_match_table = mt6323_pwrc_dt_match,
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+ },
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+};
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+
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+module_platform_driver(mt6323_pwrc_driver);
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+
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+MODULE_DESCRIPTION("Poweroff driver for MT6323 PMIC");
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+MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
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+MODULE_LICENSE("GPL v2");
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