Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 1 | /* |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 2 | * drivers/watchdog/orion_wdt.c |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 3 | * |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 4 | * Watchdog driver for Orion/Kirkwood processors |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 5 | * |
| 6 | * Author: Sylver Bruneau <sylver.bruneau@googlemail.com> |
| 7 | * |
| 8 | * This file is licensed under the terms of the GNU General Public |
| 9 | * License version 2. This program is licensed "as is" without any |
| 10 | * warranty of any kind, whether express or implied. |
| 11 | */ |
| 12 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | #include <linux/moduleparam.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/kernel.h> |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 19 | #include <linux/miscdevice.h> |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 20 | #include <linux/platform_device.h> |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 21 | #include <linux/watchdog.h> |
| 22 | #include <linux/init.h> |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 23 | #include <linux/io.h> |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 24 | #include <linux/spinlock.h> |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 25 | #include <linux/clk.h> |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 26 | #include <linux/err.h> |
Andrew Lunn | 1e7bad0 | 2012-06-10 15:20:06 +0200 | [diff] [blame] | 27 | #include <linux/of.h> |
Nicolas Pitre | fdd8b07 | 2009-04-22 20:08:17 +0100 | [diff] [blame] | 28 | #include <mach/bridge-regs.h> |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 29 | |
| 30 | /* |
| 31 | * Watchdog timer block registers. |
| 32 | */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 33 | #define TIMER_CTRL 0x0000 |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 34 | #define WDT_EN 0x0010 |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 35 | #define WDT_VAL 0x0024 |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 36 | |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 37 | #define WDT_MAX_CYCLE_COUNT 0xffffffff |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 38 | #define WDT_IN_USE 0 |
| 39 | #define WDT_OK_TO_CLOSE 1 |
| 40 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 41 | static bool nowayout = WATCHDOG_NOWAYOUT; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 42 | static int heartbeat = -1; /* module parameter (seconds) */ |
| 43 | static unsigned int wdt_max_duration; /* (seconds) */ |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 44 | static struct clk *clk; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 45 | static unsigned int wdt_tclk; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 46 | static void __iomem *wdt_reg; |
Axel Lin | 1334f32 | 2011-11-29 13:54:01 +0800 | [diff] [blame] | 47 | static DEFINE_SPINLOCK(wdt_lock); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 48 | |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 49 | static int orion_wdt_ping(struct watchdog_device *wdt_dev) |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 50 | { |
| 51 | spin_lock(&wdt_lock); |
| 52 | |
| 53 | /* Reload watchdog duration */ |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 54 | writel(wdt_tclk * wdt_dev->timeout, wdt_reg + WDT_VAL); |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 55 | |
| 56 | spin_unlock(&wdt_lock); |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 57 | return 0; |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 58 | } |
| 59 | |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 60 | static int orion_wdt_start(struct watchdog_device *wdt_dev) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 61 | { |
| 62 | u32 reg; |
| 63 | |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 64 | spin_lock(&wdt_lock); |
| 65 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 66 | /* Set watchdog duration */ |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 67 | writel(wdt_tclk * wdt_dev->timeout, wdt_reg + WDT_VAL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 68 | |
| 69 | /* Clear watchdog timer interrupt */ |
| 70 | reg = readl(BRIDGE_CAUSE); |
| 71 | reg &= ~WDT_INT_REQ; |
| 72 | writel(reg, BRIDGE_CAUSE); |
| 73 | |
| 74 | /* Enable watchdog timer */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 75 | reg = readl(wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 76 | reg |= WDT_EN; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 77 | writel(reg, wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 78 | |
| 79 | /* Enable reset on watchdog */ |
Thomas Reitmayr | 6462c61 | 2009-06-01 13:38:33 +0200 | [diff] [blame] | 80 | reg = readl(RSTOUTn_MASK); |
| 81 | reg |= WDT_RESET_OUT_EN; |
| 82 | writel(reg, RSTOUTn_MASK); |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 83 | |
| 84 | spin_unlock(&wdt_lock); |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 85 | return 0; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 86 | } |
| 87 | |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 88 | static int orion_wdt_stop(struct watchdog_device *wdt_dev) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 89 | { |
| 90 | u32 reg; |
| 91 | |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 92 | spin_lock(&wdt_lock); |
| 93 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 94 | /* Disable reset on watchdog */ |
Thomas Reitmayr | 6462c61 | 2009-06-01 13:38:33 +0200 | [diff] [blame] | 95 | reg = readl(RSTOUTn_MASK); |
| 96 | reg &= ~WDT_RESET_OUT_EN; |
| 97 | writel(reg, RSTOUTn_MASK); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 98 | |
| 99 | /* Disable watchdog timer */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 100 | reg = readl(wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 101 | reg &= ~WDT_EN; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 102 | writel(reg, wdt_reg + TIMER_CTRL); |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 103 | |
| 104 | spin_unlock(&wdt_lock); |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 105 | return 0; |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 106 | } |
| 107 | |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 108 | static unsigned int orion_wdt_get_timeleft(struct watchdog_device *wdt_dev) |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 109 | { |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 110 | unsigned int time_left; |
| 111 | |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 112 | spin_lock(&wdt_lock); |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 113 | time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk; |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 114 | spin_unlock(&wdt_lock); |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 115 | |
| 116 | return time_left; |
| 117 | } |
| 118 | |
| 119 | static int orion_wdt_set_timeout(struct watchdog_device *wdt_dev, |
| 120 | unsigned int timeout) |
| 121 | { |
| 122 | wdt_dev->timeout = timeout; |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 123 | return 0; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 124 | } |
| 125 | |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 126 | static const struct watchdog_info orion_wdt_info = { |
| 127 | .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, |
| 128 | .identity = "Orion Watchdog", |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 129 | }; |
| 130 | |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 131 | static const struct watchdog_ops orion_wdt_ops = { |
| 132 | .owner = THIS_MODULE, |
| 133 | .start = orion_wdt_start, |
| 134 | .stop = orion_wdt_stop, |
| 135 | .ping = orion_wdt_ping, |
| 136 | .set_timeout = orion_wdt_set_timeout, |
| 137 | .get_timeleft = orion_wdt_get_timeleft, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 138 | }; |
| 139 | |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 140 | static struct watchdog_device orion_wdt = { |
| 141 | .info = &orion_wdt_info, |
| 142 | .ops = &orion_wdt_ops, |
Fabio Porcedda | c1fd5f6 | 2013-02-14 09:14:25 +0100 | [diff] [blame] | 143 | .min_timeout = 1, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 144 | }; |
| 145 | |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 146 | static int orion_wdt_probe(struct platform_device *pdev) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 147 | { |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 148 | struct resource *res; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 149 | int ret; |
| 150 | |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 151 | clk = devm_clk_get(&pdev->dev, NULL); |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 152 | if (IS_ERR(clk)) { |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 153 | dev_err(&pdev->dev, "Orion Watchdog missing clock\n"); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 154 | return -ENODEV; |
| 155 | } |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 156 | clk_prepare_enable(clk); |
| 157 | wdt_tclk = clk_get_rate(clk); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 158 | |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 159 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Jason Gunthorpe | 8c4c419 | 2012-12-07 15:44:46 -0700 | [diff] [blame] | 160 | if (!res) |
| 161 | return -ENODEV; |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 162 | wdt_reg = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
| 163 | if (!wdt_reg) |
| 164 | return -ENOMEM; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 165 | |
| 166 | wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk; |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 167 | |
Fabio Porcedda | c1fd5f6 | 2013-02-14 09:14:25 +0100 | [diff] [blame] | 168 | orion_wdt.timeout = wdt_max_duration; |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 169 | orion_wdt.max_timeout = wdt_max_duration; |
Fabio Porcedda | c1fd5f6 | 2013-02-14 09:14:25 +0100 | [diff] [blame] | 170 | watchdog_init_timeout(&orion_wdt, heartbeat, &pdev->dev); |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 171 | |
| 172 | watchdog_set_nowayout(&orion_wdt, nowayout); |
| 173 | ret = watchdog_register_device(&orion_wdt); |
| 174 | if (ret) { |
| 175 | clk_disable_unprepare(clk); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 176 | return ret; |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 177 | } |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 178 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 179 | pr_info("Initial timeout %d sec%s\n", |
Fabio Porcedda | c1fd5f6 | 2013-02-14 09:14:25 +0100 | [diff] [blame] | 180 | orion_wdt.timeout, nowayout ? ", nowayout" : ""); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 181 | return 0; |
| 182 | } |
| 183 | |
Bill Pemberton | 4b12b89 | 2012-11-19 13:26:24 -0500 | [diff] [blame] | 184 | static int orion_wdt_remove(struct platform_device *pdev) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 185 | { |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 186 | watchdog_unregister_device(&orion_wdt); |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 187 | clk_disable_unprepare(clk); |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 188 | return 0; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 189 | } |
| 190 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 191 | static void orion_wdt_shutdown(struct platform_device *pdev) |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 192 | { |
Axel Lin | 0dd6e48 | 2012-03-26 11:14:29 +0800 | [diff] [blame] | 193 | orion_wdt_stop(&orion_wdt); |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 194 | } |
| 195 | |
Bill Pemberton | 1d13136 | 2012-11-19 13:24:05 -0500 | [diff] [blame] | 196 | static const struct of_device_id orion_wdt_of_match_table[] = { |
Andrew Lunn | 1e7bad0 | 2012-06-10 15:20:06 +0200 | [diff] [blame] | 197 | { .compatible = "marvell,orion-wdt", }, |
| 198 | {}, |
| 199 | }; |
| 200 | MODULE_DEVICE_TABLE(of, orion_wdt_of_match_table); |
| 201 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 202 | static struct platform_driver orion_wdt_driver = { |
| 203 | .probe = orion_wdt_probe, |
Bill Pemberton | 8226871 | 2012-11-19 13:21:12 -0500 | [diff] [blame] | 204 | .remove = orion_wdt_remove, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 205 | .shutdown = orion_wdt_shutdown, |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 206 | .driver = { |
| 207 | .owner = THIS_MODULE, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 208 | .name = "orion_wdt", |
Andrew Lunn | 1e7bad0 | 2012-06-10 15:20:06 +0200 | [diff] [blame] | 209 | .of_match_table = of_match_ptr(orion_wdt_of_match_table), |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 210 | }, |
| 211 | }; |
| 212 | |
Axel Lin | b8ec611 | 2011-11-29 13:56:27 +0800 | [diff] [blame] | 213 | module_platform_driver(orion_wdt_driver); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 214 | |
| 215 | MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>"); |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 216 | MODULE_DESCRIPTION("Orion Processor Watchdog"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 217 | |
| 218 | module_param(heartbeat, int, 0); |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 219 | MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 220 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 221 | module_param(nowayout, bool, 0); |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 222 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
| 223 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 224 | |
| 225 | MODULE_LICENSE("GPL"); |
Lubomir Rintel | f3ea733 | 2013-01-04 15:06:28 +0100 | [diff] [blame] | 226 | MODULE_ALIAS("platform:orion_wdt"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 227 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |