diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mfd/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/mfd/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mfd/rohm-bd9576.c | 189 | ||||
| -rw-r--r-- | drivers/watchdog/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
| -rw-r--r-- | drivers/watchdog/bd9576_wdt.c | 291 |
6 files changed, 506 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 7605bed6914e..6e31210915c7 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -2001,6 +2001,17 @@ config MFD_ROHM_BD71828 also a single-cell linear charger, a Coulomb counter, a real-time clock (RTC), GPIOs and a 32.768 kHz clock gate. +config MFD_ROHM_BD957XMUF + tristate "ROHM BD9576MUF and BD9573MUF Power Management ICs" + depends on I2C=y + depends on OF + select REGMAP_I2C + select MFD_CORE + help + Select this option to get support for the ROHM BD9576MUF and + BD9573MUF Power Management ICs. BD9576 and BD9573 are primarily + designed to be used to power R-Car series processors. + config MFD_STM32_LPTIMER tristate "Support for STM32 Low-Power Timer" depends on (ARCH_STM32 && OF) || COMPILE_TEST diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 20b7aeb71d38..279b80822147 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -262,6 +262,7 @@ obj-$(CONFIG_RAVE_SP_CORE) += rave-sp.o obj-$(CONFIG_MFD_ROHM_BD70528) += rohm-bd70528.o obj-$(CONFIG_MFD_ROHM_BD71828) += rohm-bd71828.o obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o +obj-$(CONFIG_MFD_ROHM_BD957XMUF) += rohm-bd9576.o obj-$(CONFIG_MFD_STMFX) += stmfx.o obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o obj-$(CONFIG_MFD_ACER_A500_EC) += acer-ec-a500.o diff --git a/drivers/mfd/rohm-bd9576.c b/drivers/mfd/rohm-bd9576.c new file mode 100644 index 000000000000..6661a27d69a8 --- /dev/null +++ b/drivers/mfd/rohm-bd9576.c @@ -0,0 +1,189 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2021 ROHM Semiconductors + * + * ROHM BD9576MUF and BD9573MUF PMIC driver + */ + +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/irq.h> +#include <linux/mfd/core.h> +#include <linux/mfd/rohm-bd957x.h> +#include <linux/mfd/rohm-generic.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/regmap.h> +#include <linux/types.h> + +enum { + BD957X_REGULATOR_CELL, + BD957X_WDT_CELL, +}; + +/* + * Due to the BD9576MUF nasty IRQ behaiour we don't always populate IRQs. + * These will be added to regulator resources only if IRQ information for the + * PMIC is populated in device-tree. + */ +static const struct resource bd9576_regulator_irqs[] = { + DEFINE_RES_IRQ_NAMED(BD9576_INT_THERM, "bd9576-temp"), + DEFINE_RES_IRQ_NAMED(BD9576_INT_OVD, "bd9576-ovd"), + DEFINE_RES_IRQ_NAMED(BD9576_INT_UVD, "bd9576-uvd"), +}; + +static struct mfd_cell bd9573_mfd_cells[] = { + [BD957X_REGULATOR_CELL] = { .name = "bd9573-regulator", }, + [BD957X_WDT_CELL] = { .name = "bd9576-wdt", }, +}; + +static struct mfd_cell bd9576_mfd_cells[] = { + [BD957X_REGULATOR_CELL] = { .name = "bd9576-regulator", }, + [BD957X_WDT_CELL] = { .name = "bd9576-wdt", }, +}; + +static const struct regmap_range volatile_ranges[] = { + regmap_reg_range(BD957X_REG_SMRB_ASSERT, BD957X_REG_SMRB_ASSERT), + regmap_reg_range(BD957X_REG_PMIC_INTERNAL_STAT, + BD957X_REG_PMIC_INTERNAL_STAT), + regmap_reg_range(BD957X_REG_INT_THERM_STAT, BD957X_REG_INT_THERM_STAT), + regmap_reg_range(BD957X_REG_INT_OVP_STAT, BD957X_REG_INT_SYS_STAT), + regmap_reg_range(BD957X_REG_INT_MAIN_STAT, BD957X_REG_INT_MAIN_STAT), +}; + +static const struct regmap_access_table volatile_regs = { + .yes_ranges = &volatile_ranges[0], + .n_yes_ranges = ARRAY_SIZE(volatile_ranges), +}; + +static struct regmap_config bd957x_regmap = { + .reg_bits = 8, + .val_bits = 8, + .volatile_table = &volatile_regs, + .max_register = BD957X_MAX_REGISTER, + .cache_type = REGCACHE_RBTREE, +}; + +static struct regmap_irq bd9576_irqs[] = { + REGMAP_IRQ_REG(BD9576_INT_THERM, 0, BD957X_MASK_INT_MAIN_THERM), + REGMAP_IRQ_REG(BD9576_INT_OVP, 0, BD957X_MASK_INT_MAIN_OVP), + REGMAP_IRQ_REG(BD9576_INT_SCP, 0, BD957X_MASK_INT_MAIN_SCP), + REGMAP_IRQ_REG(BD9576_INT_OCP, 0, BD957X_MASK_INT_MAIN_OCP), + REGMAP_IRQ_REG(BD9576_INT_OVD, 0, BD957X_MASK_INT_MAIN_OVD), + REGMAP_IRQ_REG(BD9576_INT_UVD, 0, BD957X_MASK_INT_MAIN_UVD), + REGMAP_IRQ_REG(BD9576_INT_UVP, 0, BD957X_MASK_INT_MAIN_UVP), + REGMAP_IRQ_REG(BD9576_INT_SYS, 0, BD957X_MASK_INT_MAIN_SYS), +}; + +static struct regmap_irq_chip bd9576_irq_chip = { + .name = "bd9576_irq", + .irqs = &bd9576_irqs[0], + .num_irqs = ARRAY_SIZE(bd9576_irqs), + .status_base = BD957X_REG_INT_MAIN_STAT, + .mask_base = BD957X_REG_INT_MAIN_MASK, + .ack_base = BD957X_REG_INT_MAIN_STAT, + .init_ack_masked = true, + .num_regs = 1, + .irq_reg_stride = 1, +}; + +static int bd957x_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + int ret; + struct regmap *regmap; + struct mfd_cell *cells; + int num_cells; + unsigned long chip_type; + struct irq_domain *domain; + bool usable_irqs; + + chip_type = (unsigned long)of_device_get_match_data(&i2c->dev); + + switch (chip_type) { + case ROHM_CHIP_TYPE_BD9576: + cells = bd9576_mfd_cells; + num_cells = ARRAY_SIZE(bd9576_mfd_cells); + usable_irqs = !!i2c->irq; + break; + case ROHM_CHIP_TYPE_BD9573: + cells = bd9573_mfd_cells; + num_cells = ARRAY_SIZE(bd9573_mfd_cells); + /* + * BD9573 only supports fatal IRQs which we can not handle + * because SoC is going to lose the power. + */ + usable_irqs = false; + break; + default: + dev_err(&i2c->dev, "Unknown device type"); + return -EINVAL; + } + + regmap = devm_regmap_init_i2c(i2c, &bd957x_regmap); + if (IS_ERR(regmap)) { + dev_err(&i2c->dev, "Failed to initialize Regmap\n"); + return PTR_ERR(regmap); + } + + /* + * BD9576 behaves badly. It kepts IRQ line asserted for the whole + * duration of detected HW condition (like over temperature). So we + * don't require IRQ to be populated. + * If IRQ information is not given, then we mask all IRQs and do not + * provide IRQ resources to regulator driver - which then just omits + * the notifiers. + */ + if (usable_irqs) { + struct regmap_irq_chip_data *irq_data; + struct mfd_cell *regulators; + + regulators = &bd9576_mfd_cells[BD957X_REGULATOR_CELL]; + regulators->resources = bd9576_regulator_irqs; + regulators->num_resources = ARRAY_SIZE(bd9576_regulator_irqs); + + ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq, + IRQF_ONESHOT, 0, + &bd9576_irq_chip, &irq_data); + if (ret) { + dev_err(&i2c->dev, "Failed to add IRQ chip\n"); + return ret; + } + domain = regmap_irq_get_domain(irq_data); + } else { + ret = regmap_update_bits(regmap, BD957X_REG_INT_MAIN_MASK, + BD957X_MASK_INT_ALL, + BD957X_MASK_INT_ALL); + if (ret) + return ret; + domain = NULL; + } + + ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, cells, + num_cells, NULL, 0, domain); + if (ret) + dev_err(&i2c->dev, "Failed to create subdevices\n"); + + return ret; +} + +static const struct of_device_id bd957x_of_match[] = { + { .compatible = "rohm,bd9576", .data = (void *)ROHM_CHIP_TYPE_BD9576, }, + { .compatible = "rohm,bd9573", .data = (void *)ROHM_CHIP_TYPE_BD9573, }, + { }, +}; +MODULE_DEVICE_TABLE(of, bd957x_of_match); + +static struct i2c_driver bd957x_drv = { + .driver = { + .name = "rohm-bd957x", + .of_match_table = bd957x_of_match, + }, + .probe = &bd957x_i2c_probe, +}; +module_i2c_driver(bd957x_drv); + +MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); +MODULE_DESCRIPTION("ROHM BD9576MUF and BD9573MUF Power Management IC driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 1fe0042a48d2..355100dad60a 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -172,6 +172,19 @@ config BD70528_WATCHDOG Alternatively say M to compile the driver as a module, which will be called bd70528_wdt. +config BD957XMUF_WATCHDOG + tristate "ROHM BD9576MUF and BD9573MUF PMIC Watchdog" + depends on MFD_ROHM_BD957XMUF + select WATCHDOG_CORE + help + Support for the watchdog in the ROHM BD9576 and BD9573 PMICs. + These PMIC ICs contain watchdog block which can be configured + to toggle reset line if SoC fails to ping watchdog via GPIO. + + Say Y here to include support for the ROHM BD9576 or BD9573 + watchdog. Alternatively say M to compile the driver as a module, + which will be called bd9576_wdt. + config DA9052_WATCHDOG tristate "Dialog DA9052 Watchdog" depends on PMIC_DA9052 || COMPILE_TEST diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index f3a6540e725e..a7eade8b4d45 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -204,6 +204,7 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o # Architecture Independent obj-$(CONFIG_BD70528_WATCHDOG) += bd70528_wdt.o +obj-$(CONFIG_BD957XMUF_WATCHDOG) += bd9576_wdt.o obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o obj-$(CONFIG_DA9062_WATCHDOG) += da9062_wdt.o diff --git a/drivers/watchdog/bd9576_wdt.c b/drivers/watchdog/bd9576_wdt.c new file mode 100644 index 000000000000..0b6999f3b6e8 --- /dev/null +++ b/drivers/watchdog/bd9576_wdt.c @@ -0,0 +1,291 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2020 ROHM Semiconductors + * + * ROHM BD9576MUF and BD9573MUF Watchdog driver + */ + +#include <linux/err.h> +#include <linux/gpio/consumer.h> +#include <linux/mfd/rohm-bd957x.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/watchdog.h> + +static bool nowayout; +module_param(nowayout, bool, 0); +MODULE_PARM_DESC(nowayout, + "Watchdog cannot be stopped once started (default=\"false\")"); + +#define HW_MARGIN_MIN 2 +#define HW_MARGIN_MAX 4416 +#define BD957X_WDT_DEFAULT_MARGIN 4416 +#define WATCHDOG_TIMEOUT 30 + +struct bd9576_wdt_priv { + struct gpio_desc *gpiod_ping; + struct gpio_desc *gpiod_en; + struct device *dev; + struct regmap *regmap; + bool always_running; + struct watchdog_device wdd; +}; + +static void bd9576_wdt_disable(struct bd9576_wdt_priv *priv) +{ + gpiod_set_value_cansleep(priv->gpiod_en, 0); +} + +static int bd9576_wdt_ping(struct watchdog_device *wdd) +{ + struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd); + + /* Pulse */ + gpiod_set_value_cansleep(priv->gpiod_ping, 1); + gpiod_set_value_cansleep(priv->gpiod_ping, 0); + + return 0; +} + +static int bd9576_wdt_start(struct watchdog_device *wdd) +{ + struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd); + + gpiod_set_value_cansleep(priv->gpiod_en, 1); + + return bd9576_wdt_ping(wdd); +} + +static int bd9576_wdt_stop(struct watchdog_device *wdd) +{ + struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd); + + if (!priv->always_running) + bd9576_wdt_disable(priv); + else + set_bit(WDOG_HW_RUNNING, &wdd->status); + + return 0; +} + +static const struct watchdog_info bd957x_wdt_ident = { + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | + WDIOF_SETTIMEOUT, + .identity = "BD957x Watchdog", +}; + +static const struct watchdog_ops bd957x_wdt_ops = { + .owner = THIS_MODULE, + .start = bd9576_wdt_start, + .stop = bd9576_wdt_stop, + .ping = bd9576_wdt_ping, +}; + +/* Unit is hundreds of uS */ +#define FASTNG_MIN 23 + +static int find_closest_fast(int target, int *sel, int *val) +{ + int i; + int window = FASTNG_MIN; + + for (i = 0; i < 8 && window < target; i++) + window <<= 1; + + *val = window; + *sel = i; + + if (i == 8) + return -EINVAL; + + return 0; + +} + +static int find_closest_slow_by_fast(int fast_val, int target, int *slowsel) +{ + int sel; + static const int multipliers[] = {2, 3, 7, 15}; + + for (sel = 0; sel < ARRAY_SIZE(multipliers) && + multipliers[sel] * fast_val < target; sel++) + ; + + if (sel == ARRAY_SIZE(multipliers)) + return -EINVAL; + + *slowsel = sel; + + return 0; +} + +static int find_closest_slow(int target, int *slow_sel, int *fast_sel) +{ + static const int multipliers[] = {2, 3, 7, 15}; + int i, j; + int val = 0; + int window = FASTNG_MIN; + + for (i = 0; i < 8; i++) { + for (j = 0; j < ARRAY_SIZE(multipliers); j++) { + int slow; + + slow = window * multipliers[j]; + if (slow >= target && (!val || slow < val)) { + val = slow; + *fast_sel = i; + *slow_sel = j; + } + } + window <<= 1; + } + if (!val) + return -EINVAL; + + return 0; +} + +#define BD957X_WDG_TYPE_WINDOW BIT(5) +#define BD957X_WDG_TYPE_SLOW 0 +#define BD957X_WDG_TYPE_MASK BIT(5) +#define BD957X_WDG_NG_RATIO_MASK 0x18 +#define BD957X_WDG_FASTNG_MASK 0x7 + +static int bd957x_set_wdt_mode(struct bd9576_wdt_priv *priv, int hw_margin, + int hw_margin_min) +{ + int ret, fastng, slowng, type, reg, mask; + struct device *dev = priv->dev; + + /* convert to 100uS */ + hw_margin *= 10; + hw_margin_min *= 10; + if (hw_margin_min) { + int min; + + type = BD957X_WDG_TYPE_WINDOW; + dev_dbg(dev, "Setting type WINDOW 0x%x\n", type); + ret = find_closest_fast(hw_margin_min, &fastng, &min); + if (ret) { + dev_err(dev, "bad WDT window for fast timeout\n"); + return ret; + } + + ret = find_closest_slow_by_fast(min, hw_margin, &slowng); + if (ret) { + dev_err(dev, "bad WDT window\n"); + return ret; + } + + } else { + type = BD957X_WDG_TYPE_SLOW; + dev_dbg(dev, "Setting type SLOW 0x%x\n", type); + ret = find_closest_slow(hw_margin, &slowng, &fastng); + if (ret) { + dev_err(dev, "bad WDT window\n"); + return ret; + } + } + + slowng <<= ffs(BD957X_WDG_NG_RATIO_MASK) - 1; + reg = type | slowng | fastng; + mask = BD957X_WDG_TYPE_MASK | BD957X_WDG_NG_RATIO_MASK | + BD957X_WDG_FASTNG_MASK; + ret = regmap_update_bits(priv->regmap, BD957X_REG_WDT_CONF, + mask, reg); + + return ret; +} + +static int bd9576_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->parent->of_node; + struct bd9576_wdt_priv *priv; + u32 hw_margin[2]; + u32 hw_margin_max = BD957X_WDT_DEFAULT_MARGIN, hw_margin_min = 0; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + + priv->dev = dev; + priv->regmap = dev_get_regmap(dev->parent, NULL); + if (!priv->regmap) { + dev_err(dev, "No regmap found\n"); + return -ENODEV; + } + + priv->gpiod_en = devm_gpiod_get_from_of_node(dev, dev->parent->of_node, + "rohm,watchdog-enable-gpios", + 0, GPIOD_OUT_LOW, + "watchdog-enable"); + if (IS_ERR(priv->gpiod_en)) + return dev_err_probe(dev, PTR_ERR(priv->gpiod_en), + "getting watchdog-enable GPIO failed\n"); + + priv->gpiod_ping = devm_gpiod_get_from_of_node(dev, dev->parent->of_node, + "rohm,watchdog-ping-gpios", + 0, GPIOD_OUT_LOW, + "watchdog-ping"); + if (IS_ERR(priv->gpiod_ping)) + return dev_err_probe(dev, PTR_ERR(priv->gpiod_ping), + "getting watchdog-ping GPIO failed\n"); + + ret = of_property_read_variable_u32_array(np, "rohm,hw-timeout-ms", + &hw_margin[0], 1, 2); + if (ret < 0 && ret != -EINVAL) + return ret; + + if (ret == 1) + hw_margin_max = hw_margin[0]; + + if (ret == 2) { + hw_margin_max = hw_margin[1]; + hw_margin_min = hw_margin[0]; + } + + ret = bd957x_set_wdt_mode(priv, hw_margin_max, hw_margin_min); + if (ret) + return ret; + + priv->always_running = of_property_read_bool(np, "always-running"); + + watchdog_set_drvdata(&priv->wdd, priv); + + priv->wdd.info = &bd957x_wdt_ident; + priv->wdd.ops = &bd957x_wdt_ops; + priv->wdd.min_hw_heartbeat_ms = hw_margin_min; + priv->wdd.max_hw_heartbeat_ms = hw_margin_max; + priv->wdd.parent = dev; + priv->wdd.timeout = WATCHDOG_TIMEOUT; + + watchdog_init_timeout(&priv->wdd, 0, dev); + watchdog_set_nowayout(&priv->wdd, nowayout); + + watchdog_stop_on_reboot(&priv->wdd); + + if (priv->always_running) + bd9576_wdt_start(&priv->wdd); + + return devm_watchdog_register_device(dev, &priv->wdd); +} + +static struct platform_driver bd9576_wdt_driver = { + .driver = { + .name = "bd9576-wdt", + }, + .probe = bd9576_wdt_probe, +}; + +module_platform_driver(bd9576_wdt_driver); + +MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); +MODULE_DESCRIPTION("ROHM BD9576/BD9573 Watchdog driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:bd9576-wdt"); |