[PATCH v3 5/7] power: reset: Add poweroff driver for ATC260x PMICs

Cristian Ciocaltea
2020-12-06T01:28:50Z

This driver provides poweroff and reboot support for a system through
the ATC2603C and ATC2609A chip variants of the Actions Semi ATC260x
family of PMICs.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
---
Changes in v3:
- Removed the unnecessary driver compatibles

drivers/power/reset/Kconfig | 8 +-
drivers/power/reset/Makefile | 1 +
drivers/power/reset/atc260x-poweroff.c | 263 +++++++++++++++++++++++++
3 files changed, 271 insertions(+), 1 deletion(-)
create mode 100644 drivers/power/reset/atc260x-poweroff.c

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index d55b3727e00e..87cc1a4f43b8 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -39,6 +39,13 @@ config POWER_RESET_AT91_SAMA5D2_SHDWC
This driver supports the alternate shutdown controller for some Atmel
SAMA5 SoCs. It is present for example on SAMA5D2 SoC.

+config POWER_RESET_ATC260X
+ tristate "Actions Semi ATC260x PMIC power-off driver"
+ depends on MFD_ATC260X
+ help
+ This driver provides power-off and restart support for a system
+ through Actions Semi ATC260x series PMICs.
+
config POWER_RESET_AXXIA
bool "LSI Axxia reset driver"
depends on ARCH_AXXIA
@@ -285,4 +292,3 @@ config NVMEM_REBOOT_MODE
action according to the mode.

endif
-
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index c51eceba9ea3..829df1157540 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o
obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o
obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o
obj-$(CONFIG_POWER_RESET_AT91_SAMA5D2_SHDWC) += at91-sama5d2_shdwc.o
+obj-$(CONFIG_POWER_RESET_ATC260X) += atc260x-poweroff.o
obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
obj-$(CONFIG_POWER_RESET_BRCMKONA) += brcm-kona-reset.o
obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
diff --git a/drivers/power/reset/atc260x-poweroff.c b/drivers/power/reset/atc260x-poweroff.c
new file mode 100644
index 000000000000..81b050f99302
--- /dev/null
+++ b/drivers/power/reset/atc260x-poweroff.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Poweroff & reset driver for Actions Semi ATC260x PMICs
+ *
+ * Copyright (c) 2020 Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/mfd/atc260x/core.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+struct atc260x_pwrc {
+ struct device *dev;
+ struct regmap *regmap;
+ struct notifier_block restart_nb;
+ int (*do_poweroff)(const struct atc260x_pwrc *pwrc, bool restart);
+};
+
+/* Global variable needed only for pm_power_off */
+static struct atc260x_pwrc *atc260x_pwrc_data;
+
+static int atc2603c_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
+{
+ int ret, deep_sleep = 0;
+ uint reg_mask, reg_val;
+
+ /* S4-Deep Sleep Mode is NOT available for WALL/USB power */
+ if (!restart && !power_supply_is_system_supplied()) {
+ deep_sleep = 1;
+ dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
+ }
+
+ /* Update wakeup sources */
+ reg_val = ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
+ (restart ? ATC2603C_PMU_SYS_CTL0_RESET_WK_EN
+ : ATC2603C_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
+
+ ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
+ ATC2603C_PMU_SYS_CTL0_WK_ALL, reg_val);
+ if (ret)
+ dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
+
+ /* Update power mode */
+ reg_mask = ATC2603C_PMU_SYS_CTL3_EN_S2 | ATC2603C_PMU_SYS_CTL3_EN_S3;
+
+ ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3, reg_mask,
+ deep_sleep ? 0 : ATC2603C_PMU_SYS_CTL3_EN_S3);
+ if (ret) {
+ dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
+ return ret;
+ }
+
+ /* Trigger poweroff / restart sequence */
+ reg_mask = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN
+ : ATC2603C_PMU_SYS_CTL1_EN_S1;
+ reg_val = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN : 0;
+
+ ret = regmap_update_bits(pwrc->regmap,
+ restart ? ATC2603C_PMU_SYS_CTL0 : ATC2603C_PMU_SYS_CTL1,
+ reg_mask, reg_val);
+ if (ret) {
+ dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
+ restart ? 0 : 1, ret);
+ return ret;
+ }
+
+ /* Wait for trigger completion */
+ mdelay(200);
+
+ return 0;
+}
+
+static int atc2609a_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
+{
+ int ret, deep_sleep = 0;
+ uint reg_mask, reg_val;
+
+ /* S4-Deep Sleep Mode is NOT available for WALL/USB power */
+ if (!restart && !power_supply_is_system_supplied()) {
+ deep_sleep = 1;
+ dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
+ }
+
+ /* Update wakeup sources */
+ reg_val = ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
+ (restart ? ATC2609A_PMU_SYS_CTL0_RESET_WK_EN
+ : ATC2609A_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
+
+ ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
+ ATC2609A_PMU_SYS_CTL0_WK_ALL, reg_val);
+ if (ret)
+ dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
+
+ /* Update power mode */
+ reg_mask = ATC2609A_PMU_SYS_CTL3_EN_S2 | ATC2609A_PMU_SYS_CTL3_EN_S3;
+
+ ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL3, reg_mask,
+ deep_sleep ? 0 : ATC2609A_PMU_SYS_CTL3_EN_S3);
+ if (ret) {
+ dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
+ return ret;
+ }
+
+ /* Trigger poweroff / restart sequence */
+ reg_mask = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN
+ : ATC2609A_PMU_SYS_CTL1_EN_S1;
+ reg_val = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN : 0;
+
+ ret = regmap_update_bits(pwrc->regmap,
+ restart ? ATC2609A_PMU_SYS_CTL0 : ATC2609A_PMU_SYS_CTL1,
+ reg_mask, reg_val);
+ if (ret) {
+ dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
+ restart ? 0 : 1, ret);
+ return ret;
+ }
+
+ /* Wait for trigger completion */
+ mdelay(200);
+
+ return 0;
+}
+
+static int atc2603c_init(const struct atc260x_pwrc *pwrc)
+{
+ int ret;
+
+ /*
+ * Delay transition from S2/S3 to S1 in order to avoid
+ * DDR init failure in Bootloader.
+ */
+ ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3,
+ ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN,
+ ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN);
+ if (ret)
+ dev_warn(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
+
+ /* Set wakeup sources */
+ ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
+ ATC2603C_PMU_SYS_CTL0_WK_ALL,
+ ATC2603C_PMU_SYS_CTL0_HDSW_WK_EN |
+ ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
+ if (ret)
+ dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
+
+ return ret;
+}
+
+static int atc2609a_init(const struct atc260x_pwrc *pwrc)
+{
+ int ret;
+
+ /* Set wakeup sources */
+ ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
+ ATC2609A_PMU_SYS_CTL0_WK_ALL,
+ ATC2609A_PMU_SYS_CTL0_HDSW_WK_EN |
+ ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
+ if (ret)
+ dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
+
+ return ret;
+}
+
+static void atc260x_pwrc_pm_handler(void)
+{
+ atc260x_pwrc_data->do_poweroff(atc260x_pwrc_data, false);
+
+ WARN_ONCE(1, "Unable to power off system\n");
+}
+
+static int atc260x_pwrc_restart_handler(struct notifier_block *nb,
+ unsigned long mode, void *cmd)
+{
+ struct atc260x_pwrc *pwrc = container_of(nb, struct atc260x_pwrc,
+ restart_nb);
+ pwrc->do_poweroff(pwrc, true);
+
+ return NOTIFY_DONE;
+}
+
+static int atc260x_pwrc_probe(struct platform_device *pdev)
+{
+ struct atc260x *atc260x = dev_get_drvdata(pdev->dev.parent);
+ struct atc260x_pwrc *priv;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = &pdev->dev;
+ priv->regmap = atc260x->regmap;
+ priv->restart_nb.notifier_call = atc260x_pwrc_restart_handler;
+ priv->restart_nb.priority = 192;
+
+ switch (atc260x->ic_type) {
+ case ATC2603C:
+ priv->do_poweroff = atc2603c_do_poweroff;
+ ret = atc2603c_init(priv);
+ break;
+ case ATC2609A:
+ priv->do_poweroff = atc2609a_do_poweroff;
+ ret = atc2609a_init(priv);
+ break;
+ default:
+ dev_err(priv->dev,
+ "Poweroff not supported for ATC260x PMIC type: %u\n",
+ atc260x->ic_type);
+ return -EINVAL;
+ }
+
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, priv);
+
+ if (!pm_power_off) {
+ atc260x_pwrc_data = priv;
+ pm_power_off = atc260x_pwrc_pm_handler;
+ } else {
+ dev_warn(priv->dev, "Poweroff callback already assigned\n");
+ }
+
+ ret = register_restart_handler(&priv->restart_nb);
+ if (ret)
+ dev_err(priv->dev, "failed to register restart handler: %d\n",
+ ret);
+
+ return ret;
+}
+
+static int atc260x_pwrc_remove(struct platform_device *pdev)
+{
+ struct atc260x_pwrc *priv = platform_get_drvdata(pdev);
+
+ if (atc260x_pwrc_data == priv) {
+ pm_power_off = NULL;
+ atc260x_pwrc_data = NULL;
+ }
+
+ unregister_restart_handler(&priv->restart_nb);
+
+ return 0;
+}
+
+static struct platform_driver atc260x_pwrc_driver = {
+ .probe = atc260x_pwrc_probe,
+ .remove = atc260x_pwrc_remove,
+ .driver = {
+ .name = "atc260x-pwrc",
+ },
+};
+
+module_platform_driver(atc260x_pwrc_driver);
+
+MODULE_DESCRIPTION("Poweroff & reset driver for ATC260x PMICs");
+MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>");
+MODULE_LICENSE("GPL");
--
2.29.2