Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 1 | /* |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 2 | * omap_wdt.c |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 3 | * |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 4 | * Watchdog driver for the TI OMAP 16xx & 24xx/34xx 32KHz (non-secure) watchdog |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 5 | * |
| 6 | * Author: MontaVista Software, Inc. |
| 7 | * <gdavis@mvista.com> or <source@mvista.com> |
| 8 | * |
| 9 | * 2003 (c) MontaVista Software, Inc. This file is licensed under the |
| 10 | * terms of the GNU General Public License version 2. This program is |
| 11 | * licensed "as is" without any warranty of any kind, whether express |
| 12 | * or implied. |
| 13 | * |
| 14 | * History: |
| 15 | * |
| 16 | * 20030527: George G. Davis <gdavis@mvista.com> |
| 17 | * Initially based on linux-2.4.19-rmk7-pxa1/drivers/char/sa1100_wdt.c |
| 18 | * (c) Copyright 2000 Oleg Drokin <green@crimea.edu> |
Alan Cox | 29fa058 | 2008-10-27 15:17:56 +0000 | [diff] [blame] | 19 | * Based on SoftDog driver by Alan Cox <alan@lxorguk.ukuu.org.uk> |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 20 | * |
| 21 | * Copyright (c) 2004 Texas Instruments. |
| 22 | * 1. Modified to support OMAP1610 32-KHz watchdog timer |
| 23 | * 2. Ported to 2.6 kernel |
| 24 | * |
| 25 | * Copyright (c) 2005 David Brownell |
| 26 | * Use the driver model and standard identifiers; handle bigger timeouts. |
| 27 | */ |
| 28 | |
| 29 | #include <linux/module.h> |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 30 | #include <linux/types.h> |
| 31 | #include <linux/kernel.h> |
| 32 | #include <linux/fs.h> |
| 33 | #include <linux/mm.h> |
| 34 | #include <linux/miscdevice.h> |
| 35 | #include <linux/watchdog.h> |
| 36 | #include <linux/reboot.h> |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 37 | #include <linux/init.h> |
| 38 | #include <linux/err.h> |
| 39 | #include <linux/platform_device.h> |
| 40 | #include <linux/moduleparam.h> |
| 41 | #include <linux/clk.h> |
Jiri Slaby | 1977f03 | 2007-10-18 23:40:25 -0700 | [diff] [blame] | 42 | #include <linux/bitops.h> |
Wim Van Sebroeck | 089ab07 | 2008-07-15 11:46:11 +0000 | [diff] [blame] | 43 | #include <linux/io.h> |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 44 | #include <linux/uaccess.h> |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 45 | #include <mach/hardware.h> |
Tony Lindgren | ce491cf | 2009-10-20 09:40:47 -0700 | [diff] [blame^] | 46 | #include <plat/prcm.h> |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 47 | |
| 48 | #include "omap_wdt.h" |
| 49 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 50 | static struct platform_device *omap_wdt_dev; |
| 51 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 52 | static unsigned timer_margin; |
| 53 | module_param(timer_margin, uint, 0); |
| 54 | MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)"); |
| 55 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 56 | static unsigned int wdt_trgr_pattern = 0x1234; |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 57 | static spinlock_t wdt_lock; |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 58 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 59 | struct omap_wdt_dev { |
| 60 | void __iomem *base; /* physical */ |
| 61 | struct device *dev; |
| 62 | int omap_wdt_users; |
Russell King | 39a80c7 | 2009-01-19 20:44:33 +0000 | [diff] [blame] | 63 | struct clk *ick; |
| 64 | struct clk *fck; |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 65 | struct resource *mem; |
| 66 | struct miscdevice omap_wdt_miscdev; |
| 67 | }; |
| 68 | |
| 69 | static void omap_wdt_ping(struct omap_wdt_dev *wdev) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 70 | { |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 71 | void __iomem *base = wdev->base; |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 72 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 73 | /* wait for posted write to complete */ |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 74 | while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 75 | cpu_relax(); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 76 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 77 | wdt_trgr_pattern = ~wdt_trgr_pattern; |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 78 | __raw_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR)); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 79 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 80 | /* wait for posted write to complete */ |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 81 | while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 82 | cpu_relax(); |
| 83 | /* reloaded WCRR from WLDR */ |
| 84 | } |
| 85 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 86 | static void omap_wdt_enable(struct omap_wdt_dev *wdev) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 87 | { |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 88 | void __iomem *base = wdev->base; |
| 89 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 90 | /* Sequence to enable the watchdog */ |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 91 | __raw_writel(0xBBBB, base + OMAP_WATCHDOG_SPR); |
| 92 | while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x10) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 93 | cpu_relax(); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 94 | |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 95 | __raw_writel(0x4444, base + OMAP_WATCHDOG_SPR); |
| 96 | while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x10) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 97 | cpu_relax(); |
| 98 | } |
| 99 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 100 | static void omap_wdt_disable(struct omap_wdt_dev *wdev) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 101 | { |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 102 | void __iomem *base = wdev->base; |
| 103 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 104 | /* sequence required to disable watchdog */ |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 105 | __raw_writel(0xAAAA, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */ |
| 106 | while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 107 | cpu_relax(); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 108 | |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 109 | __raw_writel(0x5555, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */ |
| 110 | while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 111 | cpu_relax(); |
| 112 | } |
| 113 | |
| 114 | static void omap_wdt_adjust_timeout(unsigned new_timeout) |
| 115 | { |
| 116 | if (new_timeout < TIMER_MARGIN_MIN) |
| 117 | new_timeout = TIMER_MARGIN_DEFAULT; |
| 118 | if (new_timeout > TIMER_MARGIN_MAX) |
| 119 | new_timeout = TIMER_MARGIN_MAX; |
| 120 | timer_margin = new_timeout; |
| 121 | } |
| 122 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 123 | static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 124 | { |
| 125 | u32 pre_margin = GET_WLDR_VAL(timer_margin); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 126 | void __iomem *base = wdev->base; |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 127 | |
| 128 | /* just count up at 32 KHz */ |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 129 | while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 130 | cpu_relax(); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 131 | |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 132 | __raw_writel(pre_margin, base + OMAP_WATCHDOG_LDR); |
| 133 | while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 134 | cpu_relax(); |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Allow only one task to hold it open |
| 139 | */ |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 140 | static int omap_wdt_open(struct inode *inode, struct file *file) |
| 141 | { |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 142 | struct omap_wdt_dev *wdev = platform_get_drvdata(omap_wdt_dev); |
| 143 | void __iomem *base = wdev->base; |
| 144 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 145 | if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users))) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 146 | return -EBUSY; |
| 147 | |
Russell King | 4c5e194 | 2009-01-23 12:48:37 +0000 | [diff] [blame] | 148 | clk_enable(wdev->ick); /* Enable the interface clock */ |
Russell King | 39a80c7 | 2009-01-19 20:44:33 +0000 | [diff] [blame] | 149 | clk_enable(wdev->fck); /* Enable the functional clock */ |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 150 | |
| 151 | /* initialize prescaler */ |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 152 | while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 153 | cpu_relax(); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 154 | |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 155 | __raw_writel((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL); |
| 156 | while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 157 | cpu_relax(); |
| 158 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 159 | file->private_data = (void *) wdev; |
| 160 | |
| 161 | omap_wdt_set_timeout(wdev); |
Ulrik Bech Hald | 789cd47 | 2009-06-12 16:18:32 -0500 | [diff] [blame] | 162 | omap_wdt_ping(wdev); /* trigger loading of new timeout value */ |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 163 | omap_wdt_enable(wdev); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 164 | |
Wim Van Sebroeck | ec9505a | 2007-07-20 20:41:37 +0000 | [diff] [blame] | 165 | return nonseekable_open(inode, file); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | static int omap_wdt_release(struct inode *inode, struct file *file) |
| 169 | { |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 170 | struct omap_wdt_dev *wdev = file->private_data; |
| 171 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 172 | /* |
| 173 | * Shut off the timer unless NOWAYOUT is defined. |
| 174 | */ |
| 175 | #ifndef CONFIG_WATCHDOG_NOWAYOUT |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 176 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 177 | omap_wdt_disable(wdev); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 178 | |
Russell King | 4c5e194 | 2009-01-23 12:48:37 +0000 | [diff] [blame] | 179 | clk_disable(wdev->ick); |
Russell King | 39a80c7 | 2009-01-19 20:44:33 +0000 | [diff] [blame] | 180 | clk_disable(wdev->fck); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 181 | #else |
| 182 | printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n"); |
| 183 | #endif |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 184 | wdev->omap_wdt_users = 0; |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 185 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 186 | return 0; |
| 187 | } |
| 188 | |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 189 | static ssize_t omap_wdt_write(struct file *file, const char __user *data, |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 190 | size_t len, loff_t *ppos) |
| 191 | { |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 192 | struct omap_wdt_dev *wdev = file->private_data; |
| 193 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 194 | /* Refresh LOAD_TIME. */ |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 195 | if (len) { |
| 196 | spin_lock(&wdt_lock); |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 197 | omap_wdt_ping(wdev); |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 198 | spin_unlock(&wdt_lock); |
| 199 | } |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 200 | return len; |
| 201 | } |
| 202 | |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 203 | static long omap_wdt_ioctl(struct file *file, unsigned int cmd, |
| 204 | unsigned long arg) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 205 | { |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 206 | struct omap_wdt_dev *wdev; |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 207 | int new_margin; |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 208 | static const struct watchdog_info ident = { |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 209 | .identity = "OMAP Watchdog", |
| 210 | .options = WDIOF_SETTIMEOUT, |
| 211 | .firmware_version = 0, |
| 212 | }; |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 213 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 214 | wdev = file->private_data; |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 215 | |
| 216 | switch (cmd) { |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 217 | case WDIOC_GETSUPPORT: |
| 218 | return copy_to_user((struct watchdog_info __user *)arg, &ident, |
| 219 | sizeof(ident)); |
| 220 | case WDIOC_GETSTATUS: |
| 221 | return put_user(0, (int __user *)arg); |
| 222 | case WDIOC_GETBOOTSTATUS: |
| 223 | if (cpu_is_omap16xx()) |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 224 | return put_user(__raw_readw(ARM_SYSST), |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 225 | (int __user *)arg); |
| 226 | if (cpu_is_omap24xx()) |
| 227 | return put_user(omap_prcm_get_reset_sources(), |
| 228 | (int __user *)arg); |
| 229 | case WDIOC_KEEPALIVE: |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 230 | spin_lock(&wdt_lock); |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 231 | omap_wdt_ping(wdev); |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 232 | spin_unlock(&wdt_lock); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 233 | return 0; |
| 234 | case WDIOC_SETTIMEOUT: |
| 235 | if (get_user(new_margin, (int __user *)arg)) |
| 236 | return -EFAULT; |
| 237 | omap_wdt_adjust_timeout(new_margin); |
| 238 | |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 239 | spin_lock(&wdt_lock); |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 240 | omap_wdt_disable(wdev); |
| 241 | omap_wdt_set_timeout(wdev); |
| 242 | omap_wdt_enable(wdev); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 243 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 244 | omap_wdt_ping(wdev); |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 245 | spin_unlock(&wdt_lock); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 246 | /* Fall */ |
| 247 | case WDIOC_GETTIMEOUT: |
| 248 | return put_user(timer_margin, (int __user *)arg); |
Wim Van Sebroeck | 0c06090 | 2008-07-18 11:41:17 +0000 | [diff] [blame] | 249 | default: |
| 250 | return -ENOTTY; |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 251 | } |
| 252 | } |
| 253 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 254 | static const struct file_operations omap_wdt_fops = { |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 255 | .owner = THIS_MODULE, |
| 256 | .write = omap_wdt_write, |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 257 | .unlocked_ioctl = omap_wdt_ioctl, |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 258 | .open = omap_wdt_open, |
| 259 | .release = omap_wdt_release, |
| 260 | }; |
| 261 | |
Uwe Kleine-König | 0e3912c | 2009-03-28 00:26:56 +0100 | [diff] [blame] | 262 | static int __devinit omap_wdt_probe(struct platform_device *pdev) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 263 | { |
| 264 | struct resource *res, *mem; |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 265 | struct omap_wdt_dev *wdev; |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 266 | int ret; |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 267 | |
| 268 | /* reserve static register mappings */ |
| 269 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 270 | if (!res) { |
| 271 | ret = -ENOENT; |
| 272 | goto err_get_resource; |
| 273 | } |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 274 | |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 275 | if (omap_wdt_dev) { |
| 276 | ret = -EBUSY; |
| 277 | goto err_busy; |
| 278 | } |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 279 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 280 | mem = request_mem_region(res->start, res->end - res->start + 1, |
| 281 | pdev->name); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 282 | if (!mem) { |
| 283 | ret = -EBUSY; |
| 284 | goto err_busy; |
| 285 | } |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 286 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 287 | wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL); |
| 288 | if (!wdev) { |
| 289 | ret = -ENOMEM; |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 290 | goto err_kzalloc; |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 291 | } |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 292 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 293 | wdev->omap_wdt_users = 0; |
| 294 | wdev->mem = mem; |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 295 | |
Russell King | 4c5e194 | 2009-01-23 12:48:37 +0000 | [diff] [blame] | 296 | wdev->ick = clk_get(&pdev->dev, "ick"); |
| 297 | if (IS_ERR(wdev->ick)) { |
| 298 | ret = PTR_ERR(wdev->ick); |
| 299 | wdev->ick = NULL; |
| 300 | goto err_clk; |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 301 | } |
Russell King | 39a80c7 | 2009-01-19 20:44:33 +0000 | [diff] [blame] | 302 | wdev->fck = clk_get(&pdev->dev, "fck"); |
| 303 | if (IS_ERR(wdev->fck)) { |
| 304 | ret = PTR_ERR(wdev->fck); |
| 305 | wdev->fck = NULL; |
| 306 | goto err_clk; |
| 307 | } |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 308 | |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 309 | wdev->base = ioremap(res->start, res->end - res->start + 1); |
| 310 | if (!wdev->base) { |
| 311 | ret = -ENOMEM; |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 312 | goto err_ioremap; |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 313 | } |
| 314 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 315 | platform_set_drvdata(pdev, wdev); |
| 316 | |
Ulrik Bech Hald | 789cd47 | 2009-06-12 16:18:32 -0500 | [diff] [blame] | 317 | clk_enable(wdev->ick); |
| 318 | clk_enable(wdev->fck); |
| 319 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 320 | omap_wdt_disable(wdev); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 321 | omap_wdt_adjust_timeout(timer_margin); |
| 322 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 323 | wdev->omap_wdt_miscdev.parent = &pdev->dev; |
| 324 | wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR; |
| 325 | wdev->omap_wdt_miscdev.name = "watchdog"; |
| 326 | wdev->omap_wdt_miscdev.fops = &omap_wdt_fops; |
| 327 | |
| 328 | ret = misc_register(&(wdev->omap_wdt_miscdev)); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 329 | if (ret) |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 330 | goto err_misc; |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 331 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 332 | pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n", |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 333 | __raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF, |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 334 | timer_margin); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 335 | |
| 336 | /* autogate OCP interface clock */ |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 337 | __raw_writel(0x01, wdev->base + OMAP_WATCHDOG_SYS_CONFIG); |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 338 | |
Ulrik Bech Hald | 789cd47 | 2009-06-12 16:18:32 -0500 | [diff] [blame] | 339 | clk_disable(wdev->ick); |
| 340 | clk_disable(wdev->fck); |
| 341 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 342 | omap_wdt_dev = pdev; |
| 343 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 344 | return 0; |
| 345 | |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 346 | err_misc: |
| 347 | platform_set_drvdata(pdev, NULL); |
| 348 | iounmap(wdev->base); |
| 349 | |
| 350 | err_ioremap: |
| 351 | wdev->base = NULL; |
| 352 | |
| 353 | err_clk: |
Russell King | 39a80c7 | 2009-01-19 20:44:33 +0000 | [diff] [blame] | 354 | if (wdev->ick) |
| 355 | clk_put(wdev->ick); |
| 356 | if (wdev->fck) |
| 357 | clk_put(wdev->fck); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 358 | kfree(wdev); |
| 359 | |
| 360 | err_kzalloc: |
| 361 | release_mem_region(res->start, res->end - res->start + 1); |
| 362 | |
| 363 | err_busy: |
| 364 | err_get_resource: |
| 365 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 366 | return ret; |
| 367 | } |
| 368 | |
| 369 | static void omap_wdt_shutdown(struct platform_device *pdev) |
| 370 | { |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 371 | struct omap_wdt_dev *wdev = platform_get_drvdata(pdev); |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 372 | |
| 373 | if (wdev->omap_wdt_users) |
| 374 | omap_wdt_disable(wdev); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 375 | } |
| 376 | |
Uwe Kleine-König | 0e3912c | 2009-03-28 00:26:56 +0100 | [diff] [blame] | 377 | static int __devexit omap_wdt_remove(struct platform_device *pdev) |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 378 | { |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 379 | struct omap_wdt_dev *wdev = platform_get_drvdata(pdev); |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 380 | struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 381 | |
| 382 | if (!res) |
| 383 | return -ENOENT; |
| 384 | |
| 385 | misc_deregister(&(wdev->omap_wdt_miscdev)); |
| 386 | release_mem_region(res->start, res->end - res->start + 1); |
| 387 | platform_set_drvdata(pdev, NULL); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 388 | |
Russell King | 4c5e194 | 2009-01-23 12:48:37 +0000 | [diff] [blame] | 389 | clk_put(wdev->ick); |
Russell King | 39a80c7 | 2009-01-19 20:44:33 +0000 | [diff] [blame] | 390 | clk_put(wdev->fck); |
Felipe Balbi | 9f69e3b | 2008-09-20 04:14:02 +0300 | [diff] [blame] | 391 | iounmap(wdev->base); |
| 392 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 393 | kfree(wdev); |
| 394 | omap_wdt_dev = NULL; |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 395 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | #ifdef CONFIG_PM |
| 400 | |
| 401 | /* REVISIT ... not clear this is the best way to handle system suspend; and |
| 402 | * it's very inappropriate for selective device suspend (e.g. suspending this |
| 403 | * through sysfs rather than by stopping the watchdog daemon). Also, this |
| 404 | * may not play well enough with NOWAYOUT... |
| 405 | */ |
| 406 | |
| 407 | static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state) |
| 408 | { |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 409 | struct omap_wdt_dev *wdev = platform_get_drvdata(pdev); |
| 410 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 411 | if (wdev->omap_wdt_users) |
| 412 | omap_wdt_disable(wdev); |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 413 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 414 | return 0; |
| 415 | } |
| 416 | |
| 417 | static int omap_wdt_resume(struct platform_device *pdev) |
| 418 | { |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 419 | struct omap_wdt_dev *wdev = platform_get_drvdata(pdev); |
| 420 | |
Felipe Balbi | 2817142 | 2008-09-20 04:14:01 +0300 | [diff] [blame] | 421 | if (wdev->omap_wdt_users) { |
| 422 | omap_wdt_enable(wdev); |
| 423 | omap_wdt_ping(wdev); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 424 | } |
Felipe Balbi | b311218 | 2008-09-20 04:14:03 +0300 | [diff] [blame] | 425 | |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | #else |
| 430 | #define omap_wdt_suspend NULL |
| 431 | #define omap_wdt_resume NULL |
| 432 | #endif |
| 433 | |
| 434 | static struct platform_driver omap_wdt_driver = { |
| 435 | .probe = omap_wdt_probe, |
Uwe Kleine-König | 0e3912c | 2009-03-28 00:26:56 +0100 | [diff] [blame] | 436 | .remove = __devexit_p(omap_wdt_remove), |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 437 | .shutdown = omap_wdt_shutdown, |
| 438 | .suspend = omap_wdt_suspend, |
| 439 | .resume = omap_wdt_resume, |
| 440 | .driver = { |
| 441 | .owner = THIS_MODULE, |
| 442 | .name = "omap_wdt", |
| 443 | }, |
| 444 | }; |
| 445 | |
| 446 | static int __init omap_wdt_init(void) |
| 447 | { |
Alan Cox | 12b9df7 | 2008-05-19 14:07:32 +0100 | [diff] [blame] | 448 | spin_lock_init(&wdt_lock); |
Komal Shah | 7768a13 | 2006-09-29 01:59:18 -0700 | [diff] [blame] | 449 | return platform_driver_register(&omap_wdt_driver); |
| 450 | } |
| 451 | |
| 452 | static void __exit omap_wdt_exit(void) |
| 453 | { |
| 454 | platform_driver_unregister(&omap_wdt_driver); |
| 455 | } |
| 456 | |
| 457 | module_init(omap_wdt_init); |
| 458 | module_exit(omap_wdt_exit); |
| 459 | |
| 460 | MODULE_AUTHOR("George G. Davis"); |
| 461 | MODULE_LICENSE("GPL"); |
| 462 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
Kay Sievers | f37d193 | 2008-04-10 21:29:23 -0700 | [diff] [blame] | 463 | MODULE_ALIAS("platform:omap_wdt"); |