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-rw-r--r--drivers/power/reset/Kconfig7
-rw-r--r--drivers/power/reset/Makefile1
-rw-r--r--drivers/power/reset/ocelot-reset.c30
-rw-r--r--drivers/power/reset/qnap-poweroff.c8
-rw-r--r--drivers/power/reset/regulator-poweroff.c82
-rw-r--r--drivers/power/reset/syscon-poweroff.c8
6 files changed, 121 insertions, 15 deletions
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index d55b3727e00e..b22c4fdb2561 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -177,6 +177,13 @@ config POWER_RESET_QNAP
Say Y if you have a QNAP NAS.
+config POWER_RESET_REGULATOR
+ bool "Regulator subsystem power-off driver"
+ depends on OF && REGULATOR
+ help
+ This driver supports turning off your board by disabling a
+ power regulator defined in the devicetree.
+
config POWER_RESET_RESTART
bool "Restart power-off driver"
help
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index c51eceba9ea3..9dc49d3a57ff 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
+obj-$(CONFIG_POWER_RESET_REGULATOR) += regulator-poweroff.o
obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o
obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o
diff --git a/drivers/power/reset/ocelot-reset.c b/drivers/power/reset/ocelot-reset.c
index f74e1dbb4ba3..8caa90cb58fc 100644
--- a/drivers/power/reset/ocelot-reset.c
+++ b/drivers/power/reset/ocelot-reset.c
@@ -29,6 +29,8 @@ struct ocelot_reset_context {
struct notifier_block restart_handler;
};
+#define BIT_OFF_INVALID 32
+
#define SOFT_CHIP_RST BIT(0)
#define ICPU_CFG_CPU_SYSTEM_CTRL_GENERAL_CTRL 0x24
@@ -50,9 +52,11 @@ static int ocelot_restart_handle(struct notifier_block *this,
ctx->props->vcore_protect, 0);
/* Make the SI back to boot mode */
- regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_GENERAL_CTRL,
- IF_SI_OWNER_MASK << if_si_owner_bit,
- IF_SI_OWNER_SIBM << if_si_owner_bit);
+ if (if_si_owner_bit != BIT_OFF_INVALID)
+ regmap_update_bits(ctx->cpu_ctrl,
+ ICPU_CFG_CPU_SYSTEM_CTRL_GENERAL_CTRL,
+ IF_SI_OWNER_MASK << if_si_owner_bit,
+ IF_SI_OWNER_SIBM << if_si_owner_bit);
pr_emerg("Resetting SoC\n");
@@ -96,6 +100,20 @@ static int ocelot_reset_probe(struct platform_device *pdev)
return err;
}
+static const struct reset_props reset_props_jaguar2 = {
+ .syscon = "mscc,ocelot-cpu-syscon",
+ .protect_reg = 0x20,
+ .vcore_protect = BIT(2),
+ .if_si_owner_bit = 6,
+};
+
+static const struct reset_props reset_props_luton = {
+ .syscon = "mscc,ocelot-cpu-syscon",
+ .protect_reg = 0x20,
+ .vcore_protect = BIT(2),
+ .if_si_owner_bit = BIT_OFF_INVALID, /* n/a */
+};
+
static const struct reset_props reset_props_ocelot = {
.syscon = "mscc,ocelot-cpu-syscon",
.protect_reg = 0x20,
@@ -112,6 +130,12 @@ static const struct reset_props reset_props_sparx5 = {
static const struct of_device_id ocelot_reset_of_match[] = {
{
+ .compatible = "mscc,jaguar2-chip-reset",
+ .data = &reset_props_jaguar2
+ }, {
+ .compatible = "mscc,luton-chip-reset",
+ .data = &reset_props_luton
+ }, {
.compatible = "mscc,ocelot-chip-reset",
.data = &reset_props_ocelot
}, {
diff --git a/drivers/power/reset/qnap-poweroff.c b/drivers/power/reset/qnap-poweroff.c
index 52b7dc61d870..0ddf7f25f7b8 100644
--- a/drivers/power/reset/qnap-poweroff.c
+++ b/drivers/power/reset/qnap-poweroff.c
@@ -14,7 +14,6 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/serial_reg.h>
-#include <linux/kallsyms.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/clk.h>
@@ -75,7 +74,6 @@ static int qnap_power_off_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct resource *res;
struct clk *clk;
- char symname[KSYM_NAME_LEN];
const struct of_device_id *match =
of_match_node(qnap_power_off_of_match_table, np);
@@ -104,10 +102,8 @@ static int qnap_power_off_probe(struct platform_device *pdev)
/* Check that nothing else has already setup a handler */
if (pm_power_off) {
- lookup_symbol_name((ulong)pm_power_off, symname);
- dev_err(&pdev->dev,
- "pm_power_off already claimed %p %s",
- pm_power_off, symname);
+ dev_err(&pdev->dev, "pm_power_off already claimed for %ps",
+ pm_power_off);
return -EBUSY;
}
pm_power_off = qnap_power_off;
diff --git a/drivers/power/reset/regulator-poweroff.c b/drivers/power/reset/regulator-poweroff.c
new file mode 100644
index 000000000000..f697088e0ad1
--- /dev/null
+++ b/drivers/power/reset/regulator-poweroff.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Force-disables a regulator to power down a device
+ *
+ * Michael Klein <michael@fossekall.de>
+ *
+ * Copyright (C) 2020 Michael Klein
+ *
+ * Based on the gpio-poweroff driver.
+ */
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+
+#define TIMEOUT_MS 3000
+
+/*
+ * Hold configuration here, cannot be more than one instance of the driver
+ * since pm_power_off itself is global.
+ */
+static struct regulator *cpu_regulator;
+
+static void regulator_poweroff_do_poweroff(void)
+{
+ if (cpu_regulator && regulator_is_enabled(cpu_regulator))
+ regulator_force_disable(cpu_regulator);
+
+ /* give it some time */
+ mdelay(TIMEOUT_MS);
+
+ WARN_ON(1);
+}
+
+static int regulator_poweroff_probe(struct platform_device *pdev)
+{
+ /* If a pm_power_off function has already been added, leave it alone */
+ if (pm_power_off != NULL) {
+ dev_err(&pdev->dev,
+ "%s: pm_power_off function already registered\n",
+ __func__);
+ return -EBUSY;
+ }
+
+ cpu_regulator = devm_regulator_get(&pdev->dev, "cpu");
+ if (IS_ERR(cpu_regulator))
+ return PTR_ERR(cpu_regulator);
+
+ pm_power_off = &regulator_poweroff_do_poweroff;
+ return 0;
+}
+
+static int regulator_poweroff_remove(__maybe_unused struct platform_device *pdev)
+{
+ if (pm_power_off == &regulator_poweroff_do_poweroff)
+ pm_power_off = NULL;
+
+ return 0;
+}
+
+static const struct of_device_id of_regulator_poweroff_match[] = {
+ { .compatible = "regulator-poweroff", },
+ {},
+};
+
+static struct platform_driver regulator_poweroff_driver = {
+ .probe = regulator_poweroff_probe,
+ .remove = regulator_poweroff_remove,
+ .driver = {
+ .name = "poweroff-regulator",
+ .of_match_table = of_regulator_poweroff_match,
+ },
+};
+
+module_platform_driver(regulator_poweroff_driver);
+
+MODULE_AUTHOR("Michael Klein <michael@fossekall.de>");
+MODULE_DESCRIPTION("Regulator poweroff driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:poweroff-regulator");
diff --git a/drivers/power/reset/syscon-poweroff.c b/drivers/power/reset/syscon-poweroff.c
index 4d6923b102b6..ed58bdf41e27 100644
--- a/drivers/power/reset/syscon-poweroff.c
+++ b/drivers/power/reset/syscon-poweroff.c
@@ -6,7 +6,6 @@
* Author: Moritz Fischer <moritz.fischer@ettus.com>
*/
-#include <linux/kallsyms.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/notifier.h>
@@ -34,7 +33,6 @@ static void syscon_poweroff(void)
static int syscon_poweroff_probe(struct platform_device *pdev)
{
- char symname[KSYM_NAME_LEN];
int mask_err, value_err;
map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "regmap");
@@ -65,10 +63,8 @@ static int syscon_poweroff_probe(struct platform_device *pdev)
}
if (pm_power_off) {
- lookup_symbol_name((ulong)pm_power_off, symname);
- dev_err(&pdev->dev,
- "pm_power_off already claimed %p %s",
- pm_power_off, symname);
+ dev_err(&pdev->dev, "pm_power_off already claimed for %ps",
+ pm_power_off);
return -EBUSY;
}
generated by cgit (git 2.34.1) at 2025-04-18 18:11:21 +0000