target/linux/ramips/patches-3.10/0211-watchdog-add-MT7621-support.patch

   1 From 158f2deb6349046ee4406578a5d3146ce9870cb3 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 211/215] 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 Index: linux-3.10.32/drivers/watchdog/Kconfig
  15 ===================================================================
  16 --- linux-3.10.32.orig/drivers/watchdog/Kconfig 2014-03-18 11:00:30.629639835 +0000
  17 +++ linux-3.10.32/drivers/watchdog/Kconfig      2014-03-18 11:02:35.141634769 +0000
  18 @@ -1120,6 +1120,13 @@
  19         help
  20           Hardware driver for the Ralink SoC Watchdog Timer.
  21
  22 +config MT7621_WDT
  23 +       tristate "Mediatek SoC watchdog"
  24 +       select WATCHDOG_CORE
  25 +       depends on SOC_MT7621
  26 +       help
  27 +         Hardware driver for the Ralink SoC Watchdog Timer.
  28 +
  29  # PARISC Architecture
  30
  31  # POWERPC Architecture
  32 Index: linux-3.10.32/drivers/watchdog/Makefile
  33 ===================================================================
  34 --- linux-3.10.32.orig/drivers/watchdog/Makefile        2014-03-18 11:00:30.629639835 +0000
  35 +++ linux-3.10.32/drivers/watchdog/Makefile     2014-03-18 11:00:31.317639807 +0000
  36 @@ -136,6 +136,7 @@
  37  octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
  38  obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
  39  obj-$(CONFIG_RALINK_WDT) += rt2880_wdt.o
  40 +obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
  41
  42  # PARISC Architecture
  43
  44 Index: linux-3.10.32/drivers/watchdog/mt7621_wdt.c
  45 ===================================================================
  46 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  47 +++ linux-3.10.32/drivers/watchdog/mt7621_wdt.c 2014-03-18 11:00:31.317639807 +0000
  48 @@ -0,0 +1,185 @@
  49 +/*
  50 + * Ralink RT288x/RT3xxx/MT76xx built-in hardware watchdog timer
  51 + *
  52 + * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
  53 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  54 + *
  55 + * This driver was based on: drivers/watchdog/softdog.c
  56 + *
  57 + * This program is free software; you can redistribute it and/or modify it
  58 + * under the terms of the GNU General Public License version 2 as published
  59 + * by the Free Software Foundation.
  60 + */
  61 +
  62 +#include <linux/clk.h>
  63 +#include <linux/reset.h>
  64 +#include <linux/module.h>
  65 +#include <linux/kernel.h>
  66 +#include <linux/watchdog.h>
  67 +#include <linux/miscdevice.h>
  68 +#include <linux/moduleparam.h>
  69 +#include <linux/platform_device.h>
  70 +
  71 +#include <asm/mach-ralink/ralink_regs.h>
  72 +
  73 +#define SYSC_RSTSTAT                   0x38
  74 +#define WDT_RST_CAUSE                  BIT(1)
  75 +
  76 +#define RALINK_WDT_TIMEOUT             30
  77 +
  78 +#define TIMER_REG_TMRSTAT              0x00
  79 +#define TIMER_REG_TMR1LOAD             0x24
  80 +#define TIMER_REG_TMR1CTL              0x20
  81 +
  82 +#define TMR1CTL_ENABLE                 BIT(7)
  83 +#define TMR1CTL_RESTART                        BIT(9)
  84 +
  85 +static void __iomem *mt762x_wdt_base;
  86 +
  87 +static bool nowayout = WATCHDOG_NOWAYOUT;
  88 +module_param(nowayout, bool, 0);
  89 +MODULE_PARM_DESC(nowayout,
  90 +               "Watchdog cannot be stopped once started (default="
  91 +               __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
  92 +
  93 +static inline void rt_wdt_w32(unsigned reg, u32 val)
  94 +{
  95 +       iowrite32(val, mt762x_wdt_base + reg);
  96 +}
  97 +
  98 +static inline u32 rt_wdt_r32(unsigned reg)
  99 +{
 100 +       return ioread32(mt762x_wdt_base + reg);
 101 +}
 102 +
 103 +static int mt762x_wdt_ping(struct watchdog_device *w)
 104 +{
 105 +       rt_wdt_w32(TIMER_REG_TMRSTAT, TMR1CTL_RESTART);
 106 +
 107 +       return 0;
 108 +}
 109 +
 110 +static int mt762x_wdt_set_timeout(struct watchdog_device *w, unsigned int t)
 111 +{
 112 +       w->timeout = t;
 113 +       rt_wdt_w32(TIMER_REG_TMR1LOAD, t * 1000);
 114 +       mt762x_wdt_ping(w);
 115 +
 116 +       return 0;
 117 +}
 118 +
 119 +static int mt762x_wdt_start(struct watchdog_device *w)
 120 +{
 121 +       u32 t;
 122 +
 123 +       rt_wdt_w32(TIMER_REG_TMR1CTL, 1000 << 16);
 124 +       mt762x_wdt_set_timeout(w, w->timeout);
 125 +
 126 +       t = rt_wdt_r32(TIMER_REG_TMR1CTL);
 127 +       t |= TMR1CTL_ENABLE;
 128 +       rt_wdt_w32(TIMER_REG_TMR1CTL, t);
 129 +
 130 +       return 0;
 131 +}
 132 +
 133 +static int mt762x_wdt_stop(struct watchdog_device *w)
 134 +{
 135 +       u32 t;
 136 +
 137 +       mt762x_wdt_ping(w);
 138 +
 139 +       t = rt_wdt_r32(TIMER_REG_TMR1CTL);
 140 +       t &= ~TMR1CTL_ENABLE;
 141 +       rt_wdt_w32(TIMER_REG_TMR1CTL, t);
 142 +
 143 +       return 0;
 144 +}
 145 +
 146 +static int mt762x_wdt_bootcause(void)
 147 +{
 148 +       if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
 149 +               return WDIOF_CARDRESET;
 150 +
 151 +       return 0;
 152 +}
 153 +
 154 +static struct watchdog_info mt762x_wdt_info = {
 155 +       .identity = "Mediatek Watchdog",
 156 +       .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 157 +};
 158 +
 159 +static struct watchdog_ops mt762x_wdt_ops = {
 160 +       .owner = THIS_MODULE,
 161 +       .start = mt762x_wdt_start,
 162 +       .stop = mt762x_wdt_stop,
 163 +       .ping = mt762x_wdt_ping,
 164 +       .set_timeout = mt762x_wdt_set_timeout,
 165 +};
 166 +
 167 +static struct watchdog_device mt762x_wdt_dev = {
 168 +       .info = &mt762x_wdt_info,
 169 +       .ops = &mt762x_wdt_ops,
 170 +       .min_timeout = 1,
 171 +};
 172 +
 173 +static int mt762x_wdt_probe(struct platform_device *pdev)
 174 +{
 175 +       struct resource *res;
 176 +       int ret;
 177 +
 178 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 179 +       mt762x_wdt_base = devm_request_and_ioremap(&pdev->dev, res);
 180 +       if (IS_ERR(mt762x_wdt_base))
 181 +               return PTR_ERR(mt762x_wdt_base);
 182 +
 183 +       device_reset(&pdev->dev);
 184 +
 185 +       mt762x_wdt_dev.dev = &pdev->dev;
 186 +       mt762x_wdt_dev.bootstatus = mt762x_wdt_bootcause();
 187 +       mt762x_wdt_dev.max_timeout = (0xfffful / 1000);
 188 +       mt762x_wdt_dev.timeout = mt762x_wdt_dev.max_timeout;
 189 +
 190 +       watchdog_set_nowayout(&mt762x_wdt_dev, nowayout);
 191 +
 192 +       ret = watchdog_register_device(&mt762x_wdt_dev);
 193 +       if (!ret)
 194 +               dev_info(&pdev->dev, "Initialized\n");
 195 +
 196 +       return 0;
 197 +}
 198 +
 199 +static int mt762x_wdt_remove(struct platform_device *pdev)
 200 +{
 201 +       watchdog_unregister_device(&mt762x_wdt_dev);
 202 +
 203 +       return 0;
 204 +}
 205 +
 206 +static void mt762x_wdt_shutdown(struct platform_device *pdev)
 207 +{
 208 +       mt762x_wdt_stop(&mt762x_wdt_dev);
 209 +}
 210 +
 211 +static const struct of_device_id mt762x_wdt_match[] = {
 212 +       { .compatible = "mtk,mt7621-wdt" },
 213 +       {},
 214 +};
 215 +MODULE_DEVICE_TABLE(of, mt762x_wdt_match);
 216 +
 217 +static struct platform_driver mt762x_wdt_driver = {
 218 +       .probe          = mt762x_wdt_probe,
 219 +       .remove         = mt762x_wdt_remove,
 220 +       .shutdown       = mt762x_wdt_shutdown,
 221 +       .driver         = {
 222 +               .name           = KBUILD_MODNAME,
 223 +               .owner          = THIS_MODULE,
 224 +               .of_match_table = mt762x_wdt_match,
 225 +       },
 226 +};
 227 +
 228 +module_platform_driver(mt762x_wdt_driver);
 229 +
 230 +MODULE_DESCRIPTION("MediaTek MT762x hardware watchdog driver");
 231 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org");
 232 +MODULE_LICENSE("GPL v2");
 233 +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);