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author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-29 01:59:13 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-29 01:59:13 +0300 |
commit | 71a5cc28e88b0db69c3f83d4061ad4cc684af09f (patch) | |
tree | 3cc40d902e7cba992c27c946f69ef65fc7d2a807 /drivers/watchdog/bd9576_wdt.c | |
parent | be18cd1fcae2ed7db58d92d20733dfa8aa0a5173 (diff) | |
parent | f9386c91574fe6da9f4fca9a47734816b0db0019 (diff) | |
download | linux-71a5cc28e88b0db69c3f83d4061ad4cc684af09f.tar.xz |
Merge tag 'mfd-next-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
Pull MFD updates from Lee Jones:
"Core Framework:
- Add support for Software Nodes to MFD Core
- Remove support for Device Properties from MFD Core
- Use standard APIs in MFD Core
New Drivers:
- Add support for ROHM BD9576MUF and BD9573MUF PMICs
- Add support for Netronix Embedded Controller, PWM and RTC
- Add support for Actions Semi ATC260x PMICs and OnKey
New Device Support:
- Add support for DG1 PCIe Graphics Card to Intel PMT
- Add support for ROHM BD71815 PMIC to ROHM BD71828
- Add support for Tolino Shine 2 HD to Netronix Embedded Controller
- Add support for AX10 BMC Secure Updates to Intel M10 BMC
Removed Device Support:
- Remove Arizona Extcon support from MFD
- Remove ST-E AB8500 Power Supply code from MFD
- Remove AB3100 altogether
New Functionality:
- Add support for SMBus and I2C modes to Dialog DA9063
- Switch to using Software Nodes in Intel (various)
New/converted Device Tree bindings:
- rohm bd71815-pmic, rohm bd9576-pmic, netronix ntxec, actions
atc260x, ricoh rn5t618, qcom pm8xxx
- Fix-ups:
- Fix error handling/path; intel_pmt
- Simplify code; rohm-bd718x7, ab8500-core, intel-m10-bmc
- Trivial clean-ups (reordering, spelling); rohm-generic, rn5t618,
max8997
- Use correct data-type; db8500-prcmu
- Remove superfluous code; lp87565, intel_quark_i2c_gpi, lpc_sch, twl
- Use generic APIs/defines; lm3533-core, intel_quark_i2c_gpio
- Regmap related fix-ups; intel-m10-bmc, sec-core
- Reorder resource freeing during remove; intel_quark_i2c_gpio
- Make table indexing more robust; intel_quark_i2c_gpio
- Fix reference imbalances; arizona-irq
- Staticify and (un)constify things; arizona-spi, stmpe, ene-kb3930,
intel-lpss-acpi, intel-lpss-pci, atc260x-i2c, intel_quark_i2c_gpio
Bug Fixes:
- Fix incorrect (register) values; intel-m10-bmc
- Kconfig related fixes; ABX500_CORE
- Do not clear the Auto Reload Register; stm32-timers"
* tag 'mfd-next-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (84 commits)
mfd: intel-m10-bmc: Add support for MAX10 BMC Secure Updates
Revert "mfd: max8997: Add of_compatible to Extcon and Charger mfd_cell"
mfd: twl: Remove unused inline function twl4030charger_usb_en()
dt-bindings: mfd: Convert pm8xxx bindings to yaml
dt-bindings: mfd: Add compatible for pmk8350 rtc
i2c: designware: Get rid of legacy platform data
mfd: intel_quark_i2c_gpio: Convert I²C to use software nodes
mfd: lpc_sch: Partially revert "Add support for Intel Quark X1000"
mfd: arizona: Fix rumtime PM imbalance on error
mfd: max8997: Replace 8998 with 8997
mfd: core: Use acpi_find_child_device() for child devices lookup
mfd: intel_quark_i2c_gpio: Don't play dirty trick with const
mfd: intel_quark_i2c_gpio: Enable MSI interrupt
mfd: intel_quark_i2c_gpio: Reuse BAR definitions for MFD cell indexing
mfd: ntxec: Support for EC in Tolino Shine 2 HD
mfd: stm32-timers: Avoid clearing auto reload register
mfd: intel_quark_i2c_gpio: Replace I²C speeds with descriptive definitions
mfd: intel_quark_i2c_gpio: Remove unused struct device member
mfd: intel_quark_i2c_gpio: Unregister resources in reversed order
mfd: Kconfig: ABX500_CORE should depend on ARCH_U8500
...
Diffstat (limited to 'drivers/watchdog/bd9576_wdt.c')
-rw-r--r-- | drivers/watchdog/bd9576_wdt.c | 291 |
1 files changed, 291 insertions, 0 deletions
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"); |