Blame view
drivers/watchdog/da9052_wdt.c
4.59 KB
2e62c4988 watchdog: add SPD... |
1 |
// SPDX-License-Identifier: GPL-2.0+ |
664a0d786 Watchdog: DA9052/... |
2 3 4 5 6 7 8 |
/* * System monitoring driver for DA9052 PMICs. * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: Anthony Olech <Anthony.Olech@diasemi.com> * |
664a0d786 Watchdog: DA9052/... |
9 10 11 12 13 14 15 16 17 18 19 |
*/ #include <linux/module.h> #include <linux/delay.h> #include <linux/uaccess.h> #include <linux/platform_device.h> #include <linux/time.h> #include <linux/watchdog.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/jiffies.h> |
664a0d786 Watchdog: DA9052/... |
20 21 22 23 24 25 26 27 28 29 |
#include <linux/mfd/da9052/reg.h> #include <linux/mfd/da9052/da9052.h> #define DA9052_DEF_TIMEOUT 4 #define DA9052_TWDMIN 256 struct da9052_wdt_data { struct watchdog_device wdt; struct da9052 *da9052; |
664a0d786 Watchdog: DA9052/... |
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 |
unsigned long jpast; }; static const struct { u8 reg_val; int time; /* Seconds */ } da9052_wdt_maps[] = { { 1, 2 }, { 2, 4 }, { 3, 8 }, { 4, 16 }, { 5, 32 }, { 5, 33 }, /* Actual time 32.768s so included both 32s and 33s */ { 6, 65 }, { 6, 66 }, /* Actual time 65.536s so include both, 65s and 66s */ { 7, 131 }, }; |
664a0d786 Watchdog: DA9052/... |
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 |
static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev, unsigned int timeout) { struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev); struct da9052 *da9052 = driver_data->da9052; int ret, i; /* * Disable the Watchdog timer before setting * new time out. */ ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG, DA9052_CONTROLD_TWDSCALE, 0); if (ret < 0) { dev_err(da9052->dev, "Failed to disable watchdog bit, %d ", ret); return ret; } if (timeout) { /* * To change the timeout, da9052 needs to * be disabled for at least 150 us. */ udelay(150); /* Set the desired timeout */ for (i = 0; i < ARRAY_SIZE(da9052_wdt_maps); i++) if (da9052_wdt_maps[i].time == timeout) break; if (i == ARRAY_SIZE(da9052_wdt_maps)) ret = -EINVAL; else ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG, DA9052_CONTROLD_TWDSCALE, da9052_wdt_maps[i].reg_val); if (ret < 0) { dev_err(da9052->dev, "Failed to update timescale bit, %d ", ret); return ret; } wdt_dev->timeout = timeout; driver_data->jpast = jiffies; } return 0; } |
664a0d786 Watchdog: DA9052/... |
97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 |
static int da9052_wdt_start(struct watchdog_device *wdt_dev) { return da9052_wdt_set_timeout(wdt_dev, wdt_dev->timeout); } static int da9052_wdt_stop(struct watchdog_device *wdt_dev) { return da9052_wdt_set_timeout(wdt_dev, 0); } static int da9052_wdt_ping(struct watchdog_device *wdt_dev) { struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev); struct da9052 *da9052 = driver_data->da9052; unsigned long msec, jnow = jiffies; int ret; /* * We have a minimum time for watchdog window called TWDMIN. A write * to the watchdog before this elapsed time should cause an error. */ msec = (jnow - driver_data->jpast) * 1000/HZ; if (msec < DA9052_TWDMIN) mdelay(msec); /* Reset the watchdog timer */ ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG, DA9052_CONTROLD_WATCHDOG, 1 << 7); if (ret < 0) |
189c049a0 watchdog: da9052_... |
126 |
return ret; |
664a0d786 Watchdog: DA9052/... |
127 128 129 130 131 |
/* * FIXME: Reset the watchdog core, in general PMIC * is supposed to do this */ |
189c049a0 watchdog: da9052_... |
132 133 |
return da9052_reg_update(da9052, DA9052_CONTROL_D_REG, DA9052_CONTROLD_WATCHDOG, 0 << 7); |
664a0d786 Watchdog: DA9052/... |
134 |
} |
6c368932f watchdog: constif... |
135 |
static const struct watchdog_info da9052_wdt_info = { |
664a0d786 Watchdog: DA9052/... |
136 137 138 139 140 141 142 143 144 145 |
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "DA9052 Watchdog", }; static const struct watchdog_ops da9052_wdt_ops = { .owner = THIS_MODULE, .start = da9052_wdt_start, .stop = da9052_wdt_stop, .ping = da9052_wdt_ping, .set_timeout = da9052_wdt_set_timeout, |
664a0d786 Watchdog: DA9052/... |
146 |
}; |
2d991a164 watchdog: remove ... |
147 |
static int da9052_wdt_probe(struct platform_device *pdev) |
664a0d786 Watchdog: DA9052/... |
148 |
{ |
f7e29623e watchdog: da9052_... |
149 150 |
struct device *dev = &pdev->dev; struct da9052 *da9052 = dev_get_drvdata(dev->parent); |
664a0d786 Watchdog: DA9052/... |
151 152 153 |
struct da9052_wdt_data *driver_data; struct watchdog_device *da9052_wdt; int ret; |
f7e29623e watchdog: da9052_... |
154 |
driver_data = devm_kzalloc(dev, sizeof(*driver_data), GFP_KERNEL); |
189c049a0 watchdog: da9052_... |
155 156 |
if (!driver_data) return -ENOMEM; |
664a0d786 Watchdog: DA9052/... |
157 158 159 160 161 162 163 |
driver_data->da9052 = da9052; da9052_wdt = &driver_data->wdt; da9052_wdt->timeout = DA9052_DEF_TIMEOUT; da9052_wdt->info = &da9052_wdt_info; da9052_wdt->ops = &da9052_wdt_ops; |
f7e29623e watchdog: da9052_... |
164 |
da9052_wdt->parent = dev; |
664a0d786 Watchdog: DA9052/... |
165 |
watchdog_set_drvdata(da9052_wdt, driver_data); |
664a0d786 Watchdog: DA9052/... |
166 167 168 |
ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG, DA9052_CONTROLD_TWDSCALE, 0); if (ret < 0) { |
f7e29623e watchdog: da9052_... |
169 170 |
dev_err(dev, "Failed to disable watchdog bits, %d ", ret); |
189c049a0 watchdog: da9052_... |
171 |
return ret; |
664a0d786 Watchdog: DA9052/... |
172 |
} |
60415f701 watchdog: da9052_... |
173 |
return devm_watchdog_register_device(dev, &driver_data->wdt); |
664a0d786 Watchdog: DA9052/... |
174 |
} |
664a0d786 Watchdog: DA9052/... |
175 176 |
static struct platform_driver da9052_wdt_driver = { .probe = da9052_wdt_probe, |
664a0d786 Watchdog: DA9052/... |
177 178 179 180 181 182 183 184 185 186 187 |
.driver = { .name = "da9052-watchdog", }, }; module_platform_driver(da9052_wdt_driver); MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>"); MODULE_DESCRIPTION("DA9052 SM Device Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:da9052-watchdog"); |