target/linux/ramips/patches-3.10/0505-watchdog-add-MT7621-support.patch

   1 From eb50d97682d78af68388d24956a74de4ab751cf7 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Mon, 2 Dec 2013 16:18:36 +0100
   4 Subject: [PATCH 505/507] 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-3.10.21/drivers/watchdog/Kconfig
  15 ===================================================================
  16 --- linux-3.10.21.orig/drivers/watchdog/Kconfig 2013-12-09 19:56:09.360682007 +0100
  17 +++ linux-3.10.21/drivers/watchdog/Kconfig      2013-12-09 19:59:20.636686594 +0100
  18 @@ -1116,7 +1116,14 @@
  19  config RALINK_WDT
  20         tristate "Ralink SoC watchdog"
  21         select WATCHDOG_CORE
  22 -       depends on RALINK
  23 +       depends on RALINK && !SOC_MT7621
  24 +       help
  25 +         Hardware driver for the Ralink SoC Watchdog Timer.
  26 +
  27 +config MT7621_WDT
  28 +       tristate "Mediatek SoC watchdog"
  29 +       select WATCHDOG_CORE
  30 +       depends on RALINK && SOC_MT7621
  31         help
  32           Hardware driver for the Ralink SoC Watchdog Timer.
  33
  34 Index: linux-3.10.21/drivers/watchdog/Makefile
  35 ===================================================================
  36 --- linux-3.10.21.orig/drivers/watchdog/Makefile        2013-12-09 19:56:09.360682007 +0100
  37 +++ linux-3.10.21/drivers/watchdog/Makefile     2013-12-09 19:56:09.752682016 +0100
  38 @@ -136,6 +136,7 @@
  39  octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
  40  obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
  41  obj-$(CONFIG_RALINK_WDT) += rt2880_wdt.o
  42 +obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
  43
  44  # PARISC Architecture
  45
  46 Index: linux-3.10.21/drivers/watchdog/mt7621_wdt.c
  47 ===================================================================
  48 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  49 +++ linux-3.10.21/drivers/watchdog/mt7621_wdt.c 2013-12-09 19:56:09.752682016 +0100
  50 @@ -0,0 +1,185 @@
  51 +/*
  52 + * Ralink RT288x/RT3xxx/MT76xx built-in hardware watchdog timer
  53 + *
  54 + * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
  55 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  56 + *
  57 + * This driver was based on: drivers/watchdog/softdog.c
  58 + *
  59 + * This program is free software; you can redistribute it and/or modify it
  60 + * under the terms of the GNU General Public License version 2 as published
  61 + * by the Free Software Foundation.
  62 + */
  63 +
  64 +#include <linux/clk.h>
  65 +#include <linux/reset.h>
  66 +#include <linux/module.h>
  67 +#include <linux/kernel.h>
  68 +#include <linux/watchdog.h>
  69 +#include <linux/miscdevice.h>
  70 +#include <linux/moduleparam.h>
  71 +#include <linux/platform_device.h>
  72 +
  73 +#include <asm/mach-ralink/ralink_regs.h>
  74 +
  75 +#define SYSC_RSTSTAT                   0x38
  76 +#define WDT_RST_CAUSE                  BIT(1)
  77 +
  78 +#define RALINK_WDT_TIMEOUT             30
  79 +
  80 +#define TIMER_REG_TMRSTAT              0x00
  81 +#define TIMER_REG_TMR1LOAD             0x24
  82 +#define TIMER_REG_TMR1CTL              0x20
  83 +
  84 +#define TMR1CTL_ENABLE                 BIT(7)
  85 +#define TMR1CTL_RESTART                        BIT(9)
  86 +
  87 +static void __iomem *mt762x_wdt_base;
  88 +
  89 +static bool nowayout = WATCHDOG_NOWAYOUT;
  90 +module_param(nowayout, bool, 0);
  91 +MODULE_PARM_DESC(nowayout,
  92 +               "Watchdog cannot be stopped once started (default="
  93 +               __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
  94 +
  95 +static inline void rt_wdt_w32(unsigned reg, u32 val)
  96 +{
  97 +       iowrite32(val, mt762x_wdt_base + reg);
  98 +}
  99 +
 100 +static inline u32 rt_wdt_r32(unsigned reg)
 101 +{
 102 +       return ioread32(mt762x_wdt_base + reg);
 103 +}
 104 +
 105 +static int mt762x_wdt_ping(struct watchdog_device *w)
 106 +{
 107 +       rt_wdt_w32(TIMER_REG_TMRSTAT, TMR1CTL_RESTART);
 108 +
 109 +       return 0;
 110 +}
 111 +
 112 +static int mt762x_wdt_set_timeout(struct watchdog_device *w, unsigned int t)
 113 +{
 114 +       w->timeout = t;
 115 +       rt_wdt_w32(TIMER_REG_TMR1LOAD, t * 1000);
 116 +       mt762x_wdt_ping(w);
 117 +
 118 +       return 0;
 119 +}
 120 +
 121 +static int mt762x_wdt_start(struct watchdog_device *w)
 122 +{
 123 +       u32 t;
 124 +
 125 +       rt_wdt_w32(TIMER_REG_TMR1CTL, 1000 << 16);
 126 +       mt762x_wdt_set_timeout(w, w->timeout);
 127 +
 128 +       t = rt_wdt_r32(TIMER_REG_TMR1CTL);
 129 +       t |= TMR1CTL_ENABLE;
 130 +       rt_wdt_w32(TIMER_REG_TMR1CTL, t);
 131 +
 132 +       return 0;
 133 +}
 134 +
 135 +static int mt762x_wdt_stop(struct watchdog_device *w)
 136 +{
 137 +       u32 t;
 138 +
 139 +       mt762x_wdt_ping(w);
 140 +
 141 +       t = rt_wdt_r32(TIMER_REG_TMR1CTL);
 142 +       t &= ~TMR1CTL_ENABLE;
 143 +       rt_wdt_w32(TIMER_REG_TMR1CTL, t);
 144 +
 145 +       return 0;
 146 +}
 147 +
 148 +static int mt762x_wdt_bootcause(void)
 149 +{
 150 +       if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
 151 +               return WDIOF_CARDRESET;
 152 +
 153 +       return 0;
 154 +}
 155 +
 156 +static struct watchdog_info mt762x_wdt_info = {
 157 +       .identity = "Mediatek Watchdog",
 158 +       .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 159 +};
 160 +
 161 +static struct watchdog_ops mt762x_wdt_ops = {
 162 +       .owner = THIS_MODULE,
 163 +       .start = mt762x_wdt_start,
 164 +       .stop = mt762x_wdt_stop,
 165 +       .ping = mt762x_wdt_ping,
 166 +       .set_timeout = mt762x_wdt_set_timeout,
 167 +};
 168 +
 169 +static struct watchdog_device mt762x_wdt_dev = {
 170 +       .info = &mt762x_wdt_info,
 171 +       .ops = &mt762x_wdt_ops,
 172 +       .min_timeout = 1,
 173 +};
 174 +
 175 +static int mt762x_wdt_probe(struct platform_device *pdev)
 176 +{
 177 +       struct resource *res;
 178 +       int ret;
 179 +
 180 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 181 +       mt762x_wdt_base = devm_request_and_ioremap(&pdev->dev, res);
 182 +       if (IS_ERR(mt762x_wdt_base))
 183 +               return PTR_ERR(mt762x_wdt_base);
 184 +
 185 +       device_reset(&pdev->dev);
 186 +
 187 +       mt762x_wdt_dev.dev = &pdev->dev;
 188 +       mt762x_wdt_dev.bootstatus = mt762x_wdt_bootcause();
 189 +       mt762x_wdt_dev.max_timeout = (0xfffful / 1000);
 190 +       mt762x_wdt_dev.timeout = mt762x_wdt_dev.max_timeout;
 191 +
 192 +       watchdog_set_nowayout(&mt762x_wdt_dev, nowayout);
 193 +
 194 +       ret = watchdog_register_device(&mt762x_wdt_dev);
 195 +       if (!ret)
 196 +               dev_info(&pdev->dev, "Initialized\n");
 197 +
 198 +       return 0;
 199 +}
 200 +
 201 +static int mt762x_wdt_remove(struct platform_device *pdev)
 202 +{
 203 +       watchdog_unregister_device(&mt762x_wdt_dev);
 204 +
 205 +       return 0;
 206 +}
 207 +
 208 +static void mt762x_wdt_shutdown(struct platform_device *pdev)
 209 +{
 210 +       mt762x_wdt_stop(&mt762x_wdt_dev);
 211 +}
 212 +
 213 +static const struct of_device_id mt762x_wdt_match[] = {
 214 +       { .compatible = "mtk,mt7621-wdt" },
 215 +       {},
 216 +};
 217 +MODULE_DEVICE_TABLE(of, mt762x_wdt_match);
 218 +
 219 +static struct platform_driver mt762x_wdt_driver = {
 220 +       .probe          = mt762x_wdt_probe,
 221 +       .remove         = mt762x_wdt_remove,
 222 +       .shutdown       = mt762x_wdt_shutdown,
 223 +       .driver         = {
 224 +               .name           = KBUILD_MODNAME,
 225 +               .owner          = THIS_MODULE,
 226 +               .of_match_table = mt762x_wdt_match,
 227 +       },
 228 +};
 229 +
 230 +module_platform_driver(mt762x_wdt_driver);
 231 +
 232 +MODULE_DESCRIPTION("MediaTek MT762x hardware watchdog driver");
 233 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org");
 234 +MODULE_LICENSE("GPL v2");
 235 +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);