target/linux/ramips/patches-4.4/0049-watchdog-add-MT7621-support.patch

   1 From 77fe64de72317c0e090d82056e7a6a073f2972b4 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sun, 16 Mar 2014 05:24:42 +0000
   4 Subject: [PATCH 49/53] watchdog: add MT7621 support
   5
   6 Signed-off-by: John Crispin <blogic@openwrt.org>
   7 ---
   8  drivers/watchdog/Kconfig      |    7 ++
   9  drivers/watchdog/Makefile     |    1 +
  10  drivers/watchdog/mt7621_wdt.c |  185 +++++++++++++++++++++++++++++++++++++++++
  11  3 files changed, 193 insertions(+)
  12  create mode 100644 drivers/watchdog/mt7621_wdt.c
  13
  14 --- a/drivers/watchdog/Kconfig
  15 +++ b/drivers/watchdog/Kconfig
  16 @@ -1354,6 +1354,13 @@ config RALINK_WDT
  17         help
  18           Hardware driver for the Ralink SoC Watchdog Timer.
  19
  20 +config MT7621_WDT
  21 +       tristate "Mediatek SoC watchdog"
  22 +       select WATCHDOG_CORE
  23 +       depends on SOC_MT7620 || SOC_MT7621
  24 +       help
  25 +         Hardware driver for the Ralink SoC Watchdog Timer.
  26 +
  27  # PARISC Architecture
  28
  29  # POWERPC Architecture
  30 --- a/drivers/watchdog/Makefile
  31 +++ b/drivers/watchdog/Makefile
  32 @@ -69,6 +69,7 @@ obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_w
  33  obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o
  34  obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o
  35  obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o
  36 +obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
  37
  38  # AVR32 Architecture
  39  obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
  40 --- /dev/null
  41 +++ b/drivers/watchdog/mt7621_wdt.c
  42 @@ -0,0 +1,185 @@
  43 +/*
  44 + * Ralink RT288x/RT3xxx/MT76xx built-in hardware watchdog timer
  45 + *
  46 + * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
  47 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  48 + *
  49 + * This driver was based on: drivers/watchdog/softdog.c
  50 + *
  51 + * This program is free software; you can redistribute it and/or modify it
  52 + * under the terms of the GNU General Public License version 2 as published
  53 + * by the Free Software Foundation.
  54 + */
  55 +
  56 +#include <linux/clk.h>
  57 +#include <linux/reset.h>
  58 +#include <linux/module.h>
  59 +#include <linux/kernel.h>
  60 +#include <linux/watchdog.h>
  61 +#include <linux/miscdevice.h>
  62 +#include <linux/moduleparam.h>
  63 +#include <linux/platform_device.h>
  64 +
  65 +#include <asm/mach-ralink/ralink_regs.h>
  66 +
  67 +#define SYSC_RSTSTAT                   0x38
  68 +#define WDT_RST_CAUSE                  BIT(1)
  69 +
  70 +#define RALINK_WDT_TIMEOUT             30
  71 +
  72 +#define TIMER_REG_TMRSTAT              0x00
  73 +#define TIMER_REG_TMR1LOAD             0x24
  74 +#define TIMER_REG_TMR1CTL              0x20
  75 +
  76 +#define TMR1CTL_ENABLE                 BIT(7)
  77 +#define TMR1CTL_RESTART                        BIT(9)
  78 +
  79 +static void __iomem *mt762x_wdt_base;
  80 +
  81 +static bool nowayout = WATCHDOG_NOWAYOUT;
  82 +module_param(nowayout, bool, 0);
  83 +MODULE_PARM_DESC(nowayout,
  84 +               "Watchdog cannot be stopped once started (default="
  85 +               __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
  86 +
  87 +static inline void rt_wdt_w32(unsigned reg, u32 val)
  88 +{
  89 +       iowrite32(val, mt762x_wdt_base + reg);
  90 +}
  91 +
  92 +static inline u32 rt_wdt_r32(unsigned reg)
  93 +{
  94 +       return ioread32(mt762x_wdt_base + reg);
  95 +}
  96 +
  97 +static int mt762x_wdt_ping(struct watchdog_device *w)
  98 +{
  99 +       rt_wdt_w32(TIMER_REG_TMRSTAT, TMR1CTL_RESTART);
 100 +
 101 +       return 0;
 102 +}
 103 +
 104 +static int mt762x_wdt_set_timeout(struct watchdog_device *w, unsigned int t)
 105 +{
 106 +       w->timeout = t;
 107 +       rt_wdt_w32(TIMER_REG_TMR1LOAD, t * 1000);
 108 +       mt762x_wdt_ping(w);
 109 +
 110 +       return 0;
 111 +}
 112 +
 113 +static int mt762x_wdt_start(struct watchdog_device *w)
 114 +{
 115 +       u32 t;
 116 +
 117 +       rt_wdt_w32(TIMER_REG_TMR1CTL, 1000 << 16);
 118 +       mt762x_wdt_set_timeout(w, w->timeout);
 119 +
 120 +       t = rt_wdt_r32(TIMER_REG_TMR1CTL);
 121 +       t |= TMR1CTL_ENABLE;
 122 +       rt_wdt_w32(TIMER_REG_TMR1CTL, t);
 123 +
 124 +       return 0;
 125 +}
 126 +
 127 +static int mt762x_wdt_stop(struct watchdog_device *w)
 128 +{
 129 +       u32 t;
 130 +
 131 +       mt762x_wdt_ping(w);
 132 +
 133 +       t = rt_wdt_r32(TIMER_REG_TMR1CTL);
 134 +       t &= ~TMR1CTL_ENABLE;
 135 +       rt_wdt_w32(TIMER_REG_TMR1CTL, t);
 136 +
 137 +       return 0;
 138 +}
 139 +
 140 +static int mt762x_wdt_bootcause(void)
 141 +{
 142 +       if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
 143 +               return WDIOF_CARDRESET;
 144 +
 145 +       return 0;
 146 +}
 147 +
 148 +static struct watchdog_info mt762x_wdt_info = {
 149 +       .identity = "Mediatek Watchdog",
 150 +       .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 151 +};
 152 +
 153 +static struct watchdog_ops mt762x_wdt_ops = {
 154 +       .owner = THIS_MODULE,
 155 +       .start = mt762x_wdt_start,
 156 +       .stop = mt762x_wdt_stop,
 157 +       .ping = mt762x_wdt_ping,
 158 +       .set_timeout = mt762x_wdt_set_timeout,
 159 +};
 160 +
 161 +static struct watchdog_device mt762x_wdt_dev = {
 162 +       .info = &mt762x_wdt_info,
 163 +       .ops = &mt762x_wdt_ops,
 164 +       .min_timeout = 1,
 165 +};
 166 +
 167 +static int mt762x_wdt_probe(struct platform_device *pdev)
 168 +{
 169 +       struct resource *res;
 170 +       int ret;
 171 +
 172 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 173 +       mt762x_wdt_base = devm_ioremap_resource(&pdev->dev, res);
 174 +       if (IS_ERR(mt762x_wdt_base))
 175 +               return PTR_ERR(mt762x_wdt_base);
 176 +
 177 +       device_reset(&pdev->dev);
 178 +
 179 +       mt762x_wdt_dev.dev = &pdev->dev;
 180 +       mt762x_wdt_dev.bootstatus = mt762x_wdt_bootcause();
 181 +       mt762x_wdt_dev.max_timeout = (0xfffful / 1000);
 182 +       mt762x_wdt_dev.timeout = mt762x_wdt_dev.max_timeout;
 183 +
 184 +       watchdog_set_nowayout(&mt762x_wdt_dev, nowayout);
 185 +
 186 +       ret = watchdog_register_device(&mt762x_wdt_dev);
 187 +       if (!ret)
 188 +               dev_info(&pdev->dev, "Initialized\n");
 189 +
 190 +       return 0;
 191 +}
 192 +
 193 +static int mt762x_wdt_remove(struct platform_device *pdev)
 194 +{
 195 +       watchdog_unregister_device(&mt762x_wdt_dev);
 196 +
 197 +       return 0;
 198 +}
 199 +
 200 +static void mt762x_wdt_shutdown(struct platform_device *pdev)
 201 +{
 202 +       mt762x_wdt_stop(&mt762x_wdt_dev);
 203 +}
 204 +
 205 +static const struct of_device_id mt762x_wdt_match[] = {
 206 +       { .compatible = "mtk,mt7621-wdt" },
 207 +       {},
 208 +};
 209 +MODULE_DEVICE_TABLE(of, mt762x_wdt_match);
 210 +
 211 +static struct platform_driver mt762x_wdt_driver = {
 212 +       .probe          = mt762x_wdt_probe,
 213 +       .remove         = mt762x_wdt_remove,
 214 +       .shutdown       = mt762x_wdt_shutdown,
 215 +       .driver         = {
 216 +               .name           = KBUILD_MODNAME,
 217 +               .owner          = THIS_MODULE,
 218 +               .of_match_table = mt762x_wdt_match,
 219 +       },
 220 +};
 221 +
 222 +module_platform_driver(mt762x_wdt_driver);
 223 +
 224 +MODULE_DESCRIPTION("MediaTek MT762x hardware watchdog driver");
 225 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org");
 226 +MODULE_LICENSE("GPL v2");
 227 +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);