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1/*
2 * drivers/watchdog/orion_wdt.c
3 *
4 * Watchdog driver for Orion/Kirkwood processors
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
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/types.h>
16#include <linux/kernel.h>
17#include <linux/fs.h>
18#include <linux/miscdevice.h>
19#include <linux/platform_device.h>
20#include <linux/watchdog.h>
21#include <linux/init.h>
22#include <linux/uaccess.h>
23#include <linux/io.h>
24#include <linux/spinlock.h>
25#include <mach/bridge-regs.h>
26#include <plat/orion_wdt.h>
27
28/*
29 * Watchdog timer block registers.
30 */
31#define TIMER_CTRL (TIMER_VIRT_BASE + 0x0000)
32#define WDT_EN 0x0010
33#define WDT_VAL (TIMER_VIRT_BASE + 0x0024)
34
35#define WDT_MAX_CYCLE_COUNT 0xffffffff
36#define WDT_IN_USE 0
37#define WDT_OK_TO_CLOSE 1
38
39static int nowayout = WATCHDOG_NOWAYOUT;
40static int heartbeat = -1; /* module parameter (seconds) */
41static unsigned int wdt_max_duration; /* (seconds) */
42static unsigned int wdt_tclk;
43static unsigned long wdt_status;
44static spinlock_t wdt_lock;
45
46static void orion_wdt_ping(void)
47{
48 spin_lock(&wdt_lock);
49
50 /* Reload watchdog duration */
51 writel(wdt_tclk * heartbeat, WDT_VAL);
52
53 spin_unlock(&wdt_lock);
54}
55
56static void orion_wdt_enable(void)
57{
58 u32 reg;
59
60 spin_lock(&wdt_lock);
61
62 /* Set watchdog duration */
63 writel(wdt_tclk * heartbeat, WDT_VAL);
64
65 /* Clear watchdog timer interrupt */
66 reg = readl(BRIDGE_CAUSE);
67 reg &= ~WDT_INT_REQ;
68 writel(reg, BRIDGE_CAUSE);
69
70 /* Enable watchdog timer */
71 reg = readl(TIMER_CTRL);
72 reg |= WDT_EN;
73 writel(reg, TIMER_CTRL);
74
75 /* Enable reset on watchdog */
76 reg = readl(RSTOUTn_MASK);
77 reg |= WDT_RESET_OUT_EN;
78 writel(reg, RSTOUTn_MASK);
79
80 spin_unlock(&wdt_lock);
81}
82
83static void orion_wdt_disable(void)
84{
85 u32 reg;
86
87 spin_lock(&wdt_lock);
88
89 /* Disable reset on watchdog */
90 reg = readl(RSTOUTn_MASK);
91 reg &= ~WDT_RESET_OUT_EN;
92 writel(reg, RSTOUTn_MASK);
93
94 /* Disable watchdog timer */
95 reg = readl(TIMER_CTRL);
96 reg &= ~WDT_EN;
97 writel(reg, TIMER_CTRL);
98
99 spin_unlock(&wdt_lock);
100}
101
102static int orion_wdt_get_timeleft(int *time_left)
103{
104 spin_lock(&wdt_lock);
105 *time_left = readl(WDT_VAL) / wdt_tclk;
106 spin_unlock(&wdt_lock);
107 return 0;
108}
109
110static int orion_wdt_open(struct inode *inode, struct file *file)
111{
112 if (test_and_set_bit(WDT_IN_USE, &wdt_status))
113 return -EBUSY;
114 clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
115 orion_wdt_enable();
116 return nonseekable_open(inode, file);
117}
118
119static ssize_t orion_wdt_write(struct file *file, const char *data,
120 size_t len, loff_t *ppos)
121{
122 if (len) {
123 if (!nowayout) {
124 size_t i;
125
126 clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
127 for (i = 0; i != len; i++) {
128 char c;
129
130 if (get_user(c, data + i))
131 return -EFAULT;
132 if (c == 'V')
133 set_bit(WDT_OK_TO_CLOSE, &wdt_status);
134 }
135 }
136 orion_wdt_ping();
137 }
138 return len;
139}
140
141static int orion_wdt_settimeout(int new_time)
142{
143 if ((new_time <= 0) || (new_time > wdt_max_duration))
144 return -EINVAL;
145
146 /* Set new watchdog time to be used when
147 * orion_wdt_enable() or orion_wdt_ping() is called. */
148 heartbeat = new_time;
149 return 0;
150}
151
152static const struct watchdog_info ident = {
153 .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
154 WDIOF_KEEPALIVEPING,
155 .identity = "Orion Watchdog",
156};
157
158static long orion_wdt_ioctl(struct file *file, unsigned int cmd,
159 unsigned long arg)
160{
161 int ret = -ENOTTY;
162 int time;
163
164 switch (cmd) {
165 case WDIOC_GETSUPPORT:
166 ret = copy_to_user((struct watchdog_info *)arg, &ident,
167 sizeof(ident)) ? -EFAULT : 0;
168 break;
169
170 case WDIOC_GETSTATUS:
171 case WDIOC_GETBOOTSTATUS:
172 ret = put_user(0, (int *)arg);
173 break;
174
175 case WDIOC_KEEPALIVE:
176 orion_wdt_ping();
177 ret = 0;
178 break;
179
180 case WDIOC_SETTIMEOUT:
181 ret = get_user(time, (int *)arg);
182 if (ret)
183 break;
184
185 if (orion_wdt_settimeout(time)) {
186 ret = -EINVAL;
187 break;
188 }
189 orion_wdt_ping();
190 /* Fall through */
191
192 case WDIOC_GETTIMEOUT:
193 ret = put_user(heartbeat, (int *)arg);
194 break;
195
196 case WDIOC_GETTIMELEFT:
197 if (orion_wdt_get_timeleft(&time)) {
198 ret = -EINVAL;
199 break;
200 }
201 ret = put_user(time, (int *)arg);
202 break;
203 }
204 return ret;
205}
206
207static int orion_wdt_release(struct inode *inode, struct file *file)
208{
209 if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
210 orion_wdt_disable();
211 else
212 printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
213 "timer will not stop\n");
214 clear_bit(WDT_IN_USE, &wdt_status);
215 clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
216
217 return 0;
218}
219
220
221static const struct file_operations orion_wdt_fops = {
222 .owner = THIS_MODULE,
223 .llseek = no_llseek,
224 .write = orion_wdt_write,
225 .unlocked_ioctl = orion_wdt_ioctl,
226 .open = orion_wdt_open,
227 .release = orion_wdt_release,
228};
229
230static struct miscdevice orion_wdt_miscdev = {
231 .minor = WATCHDOG_MINOR,
232 .name = "watchdog",
233 .fops = &orion_wdt_fops,
234};
235
236static int __devinit orion_wdt_probe(struct platform_device *pdev)
237{
238 struct orion_wdt_platform_data *pdata = pdev->dev.platform_data;
239 int ret;
240
241 if (pdata) {
242 wdt_tclk = pdata->tclk;
243 } else {
244 printk(KERN_ERR "Orion Watchdog misses platform data\n");
245 return -ENODEV;
246 }
247
248 if (orion_wdt_miscdev.parent)
249 return -EBUSY;
250 orion_wdt_miscdev.parent = &pdev->dev;
251
252 wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk;
253 if (orion_wdt_settimeout(heartbeat))
254 heartbeat = wdt_max_duration;
255
256 ret = misc_register(&orion_wdt_miscdev);
257 if (ret)
258 return ret;
259
260 printk(KERN_INFO "Orion Watchdog Timer: Initial timeout %d sec%s\n",
261 heartbeat, nowayout ? ", nowayout" : "");
262 return 0;
263}
264
265static int __devexit orion_wdt_remove(struct platform_device *pdev)
266{
267 int ret;
268
269 if (test_bit(WDT_IN_USE, &wdt_status)) {
270 orion_wdt_disable();
271 clear_bit(WDT_IN_USE, &wdt_status);
272 }
273
274 ret = misc_deregister(&orion_wdt_miscdev);
275 if (!ret)
276 orion_wdt_miscdev.parent = NULL;
277
278 return ret;
279}
280
281static void orion_wdt_shutdown(struct platform_device *pdev)
282{
283 if (test_bit(WDT_IN_USE, &wdt_status))
284 orion_wdt_disable();
285}
286
287static struct platform_driver orion_wdt_driver = {
288 .probe = orion_wdt_probe,
289 .remove = __devexit_p(orion_wdt_remove),
290 .shutdown = orion_wdt_shutdown,
291 .driver = {
292 .owner = THIS_MODULE,
293 .name = "orion_wdt",
294 },
295};
296
297static int __init orion_wdt_init(void)
298{
299 spin_lock_init(&wdt_lock);
300 return platform_driver_register(&orion_wdt_driver);
301}
302
303static void __exit orion_wdt_exit(void)
304{
305 platform_driver_unregister(&orion_wdt_driver);
306}
307
308module_init(orion_wdt_init);
309module_exit(orion_wdt_exit);
310
311MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>");
312MODULE_DESCRIPTION("Orion Processor Watchdog");
313
314module_param(heartbeat, int, 0);
315MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds");
316
317module_param(nowayout, int, 0);
318MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
319 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
320
321MODULE_LICENSE("GPL");
322MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
1/*
2 * drivers/watchdog/orion_wdt.c
3 *
4 * Watchdog driver for Orion/Kirkwood processors
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
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/module.h>
16#include <linux/moduleparam.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/platform_device.h>
20#include <linux/watchdog.h>
21#include <linux/interrupt.h>
22#include <linux/io.h>
23#include <linux/clk.h>
24#include <linux/err.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27
28/* RSTOUT mask register physical address for Orion5x, Kirkwood and Dove */
29#define ORION_RSTOUT_MASK_OFFSET 0x20108
30
31/* Internal registers can be configured at any 1 MiB aligned address */
32#define INTERNAL_REGS_MASK ~(SZ_1M - 1)
33
34/*
35 * Watchdog timer block registers.
36 */
37#define TIMER_CTRL 0x0000
38#define TIMER1_FIXED_ENABLE_BIT BIT(12)
39#define WDT_AXP_FIXED_ENABLE_BIT BIT(10)
40#define TIMER1_ENABLE_BIT BIT(2)
41
42#define TIMER_A370_STATUS 0x0004
43#define WDT_A370_EXPIRED BIT(31)
44#define TIMER1_STATUS_BIT BIT(8)
45
46#define TIMER1_VAL_OFF 0x001c
47
48#define WDT_MAX_CYCLE_COUNT 0xffffffff
49
50#define WDT_A370_RATIO_MASK(v) ((v) << 16)
51#define WDT_A370_RATIO_SHIFT 5
52#define WDT_A370_RATIO (1 << WDT_A370_RATIO_SHIFT)
53
54static bool nowayout = WATCHDOG_NOWAYOUT;
55static int heartbeat; /* module parameter (seconds) */
56
57struct orion_watchdog;
58
59struct orion_watchdog_data {
60 int wdt_counter_offset;
61 int wdt_enable_bit;
62 int rstout_enable_bit;
63 int rstout_mask_bit;
64 int (*clock_init)(struct platform_device *,
65 struct orion_watchdog *);
66 int (*enabled)(struct orion_watchdog *);
67 int (*start)(struct watchdog_device *);
68 int (*stop)(struct watchdog_device *);
69};
70
71struct orion_watchdog {
72 struct watchdog_device wdt;
73 void __iomem *reg;
74 void __iomem *rstout;
75 void __iomem *rstout_mask;
76 unsigned long clk_rate;
77 struct clk *clk;
78 const struct orion_watchdog_data *data;
79};
80
81static int orion_wdt_clock_init(struct platform_device *pdev,
82 struct orion_watchdog *dev)
83{
84 int ret;
85
86 dev->clk = clk_get(&pdev->dev, NULL);
87 if (IS_ERR(dev->clk))
88 return PTR_ERR(dev->clk);
89 ret = clk_prepare_enable(dev->clk);
90 if (ret) {
91 clk_put(dev->clk);
92 return ret;
93 }
94
95 dev->clk_rate = clk_get_rate(dev->clk);
96 return 0;
97}
98
99static int armada370_wdt_clock_init(struct platform_device *pdev,
100 struct orion_watchdog *dev)
101{
102 int ret;
103
104 dev->clk = clk_get(&pdev->dev, NULL);
105 if (IS_ERR(dev->clk))
106 return PTR_ERR(dev->clk);
107 ret = clk_prepare_enable(dev->clk);
108 if (ret) {
109 clk_put(dev->clk);
110 return ret;
111 }
112
113 /* Setup watchdog input clock */
114 atomic_io_modify(dev->reg + TIMER_CTRL,
115 WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT),
116 WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT));
117
118 dev->clk_rate = clk_get_rate(dev->clk) / WDT_A370_RATIO;
119 return 0;
120}
121
122static int armada375_wdt_clock_init(struct platform_device *pdev,
123 struct orion_watchdog *dev)
124{
125 int ret;
126
127 dev->clk = of_clk_get_by_name(pdev->dev.of_node, "fixed");
128 if (!IS_ERR(dev->clk)) {
129 ret = clk_prepare_enable(dev->clk);
130 if (ret) {
131 clk_put(dev->clk);
132 return ret;
133 }
134
135 atomic_io_modify(dev->reg + TIMER_CTRL,
136 WDT_AXP_FIXED_ENABLE_BIT,
137 WDT_AXP_FIXED_ENABLE_BIT);
138 dev->clk_rate = clk_get_rate(dev->clk);
139
140 return 0;
141 }
142
143 /* Mandatory fallback for proper devicetree backward compatibility */
144 dev->clk = clk_get(&pdev->dev, NULL);
145 if (IS_ERR(dev->clk))
146 return PTR_ERR(dev->clk);
147
148 ret = clk_prepare_enable(dev->clk);
149 if (ret) {
150 clk_put(dev->clk);
151 return ret;
152 }
153
154 atomic_io_modify(dev->reg + TIMER_CTRL,
155 WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT),
156 WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT));
157 dev->clk_rate = clk_get_rate(dev->clk) / WDT_A370_RATIO;
158
159 return 0;
160}
161
162static int armadaxp_wdt_clock_init(struct platform_device *pdev,
163 struct orion_watchdog *dev)
164{
165 int ret;
166 u32 val;
167
168 dev->clk = of_clk_get_by_name(pdev->dev.of_node, "fixed");
169 if (IS_ERR(dev->clk))
170 return PTR_ERR(dev->clk);
171 ret = clk_prepare_enable(dev->clk);
172 if (ret) {
173 clk_put(dev->clk);
174 return ret;
175 }
176
177 /* Fix the wdt and timer1 clock frequency to 25MHz */
178 val = WDT_AXP_FIXED_ENABLE_BIT | TIMER1_FIXED_ENABLE_BIT;
179 atomic_io_modify(dev->reg + TIMER_CTRL, val, val);
180
181 dev->clk_rate = clk_get_rate(dev->clk);
182 return 0;
183}
184
185static int orion_wdt_ping(struct watchdog_device *wdt_dev)
186{
187 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
188 /* Reload watchdog duration */
189 writel(dev->clk_rate * wdt_dev->timeout,
190 dev->reg + dev->data->wdt_counter_offset);
191 if (dev->wdt.info->options & WDIOF_PRETIMEOUT)
192 writel(dev->clk_rate * (wdt_dev->timeout - wdt_dev->pretimeout),
193 dev->reg + TIMER1_VAL_OFF);
194
195 return 0;
196}
197
198static int armada375_start(struct watchdog_device *wdt_dev)
199{
200 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
201 u32 reg;
202
203 /* Set watchdog duration */
204 writel(dev->clk_rate * wdt_dev->timeout,
205 dev->reg + dev->data->wdt_counter_offset);
206 if (dev->wdt.info->options & WDIOF_PRETIMEOUT)
207 writel(dev->clk_rate * (wdt_dev->timeout - wdt_dev->pretimeout),
208 dev->reg + TIMER1_VAL_OFF);
209
210 /* Clear the watchdog expiration bit */
211 atomic_io_modify(dev->reg + TIMER_A370_STATUS, WDT_A370_EXPIRED, 0);
212
213 /* Enable watchdog timer */
214 reg = dev->data->wdt_enable_bit;
215 if (dev->wdt.info->options & WDIOF_PRETIMEOUT)
216 reg |= TIMER1_ENABLE_BIT;
217 atomic_io_modify(dev->reg + TIMER_CTRL, reg, reg);
218
219 /* Enable reset on watchdog */
220 reg = readl(dev->rstout);
221 reg |= dev->data->rstout_enable_bit;
222 writel(reg, dev->rstout);
223
224 atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit, 0);
225 return 0;
226}
227
228static int armada370_start(struct watchdog_device *wdt_dev)
229{
230 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
231 u32 reg;
232
233 /* Set watchdog duration */
234 writel(dev->clk_rate * wdt_dev->timeout,
235 dev->reg + dev->data->wdt_counter_offset);
236
237 /* Clear the watchdog expiration bit */
238 atomic_io_modify(dev->reg + TIMER_A370_STATUS, WDT_A370_EXPIRED, 0);
239
240 /* Enable watchdog timer */
241 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit,
242 dev->data->wdt_enable_bit);
243
244 /* Enable reset on watchdog */
245 reg = readl(dev->rstout);
246 reg |= dev->data->rstout_enable_bit;
247 writel(reg, dev->rstout);
248 return 0;
249}
250
251static int orion_start(struct watchdog_device *wdt_dev)
252{
253 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
254
255 /* Set watchdog duration */
256 writel(dev->clk_rate * wdt_dev->timeout,
257 dev->reg + dev->data->wdt_counter_offset);
258
259 /* Enable watchdog timer */
260 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit,
261 dev->data->wdt_enable_bit);
262
263 /* Enable reset on watchdog */
264 atomic_io_modify(dev->rstout, dev->data->rstout_enable_bit,
265 dev->data->rstout_enable_bit);
266
267 return 0;
268}
269
270static int orion_wdt_start(struct watchdog_device *wdt_dev)
271{
272 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
273
274 /* There are some per-SoC quirks to handle */
275 return dev->data->start(wdt_dev);
276}
277
278static int orion_stop(struct watchdog_device *wdt_dev)
279{
280 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
281
282 /* Disable reset on watchdog */
283 atomic_io_modify(dev->rstout, dev->data->rstout_enable_bit, 0);
284
285 /* Disable watchdog timer */
286 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
287
288 return 0;
289}
290
291static int armada375_stop(struct watchdog_device *wdt_dev)
292{
293 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
294 u32 reg, mask;
295
296 /* Disable reset on watchdog */
297 atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit,
298 dev->data->rstout_mask_bit);
299 reg = readl(dev->rstout);
300 reg &= ~dev->data->rstout_enable_bit;
301 writel(reg, dev->rstout);
302
303 /* Disable watchdog timer */
304 mask = dev->data->wdt_enable_bit;
305 if (wdt_dev->info->options & WDIOF_PRETIMEOUT)
306 mask |= TIMER1_ENABLE_BIT;
307 atomic_io_modify(dev->reg + TIMER_CTRL, mask, 0);
308
309 return 0;
310}
311
312static int armada370_stop(struct watchdog_device *wdt_dev)
313{
314 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
315 u32 reg;
316
317 /* Disable reset on watchdog */
318 reg = readl(dev->rstout);
319 reg &= ~dev->data->rstout_enable_bit;
320 writel(reg, dev->rstout);
321
322 /* Disable watchdog timer */
323 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
324
325 return 0;
326}
327
328static int orion_wdt_stop(struct watchdog_device *wdt_dev)
329{
330 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
331
332 return dev->data->stop(wdt_dev);
333}
334
335static int orion_enabled(struct orion_watchdog *dev)
336{
337 bool enabled, running;
338
339 enabled = readl(dev->rstout) & dev->data->rstout_enable_bit;
340 running = readl(dev->reg + TIMER_CTRL) & dev->data->wdt_enable_bit;
341
342 return enabled && running;
343}
344
345static int armada375_enabled(struct orion_watchdog *dev)
346{
347 bool masked, enabled, running;
348
349 masked = readl(dev->rstout_mask) & dev->data->rstout_mask_bit;
350 enabled = readl(dev->rstout) & dev->data->rstout_enable_bit;
351 running = readl(dev->reg + TIMER_CTRL) & dev->data->wdt_enable_bit;
352
353 return !masked && enabled && running;
354}
355
356static int orion_wdt_enabled(struct watchdog_device *wdt_dev)
357{
358 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
359
360 return dev->data->enabled(dev);
361}
362
363static unsigned int orion_wdt_get_timeleft(struct watchdog_device *wdt_dev)
364{
365 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
366 return readl(dev->reg + dev->data->wdt_counter_offset) / dev->clk_rate;
367}
368
369static struct watchdog_info orion_wdt_info = {
370 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
371 .identity = "Orion Watchdog",
372};
373
374static const struct watchdog_ops orion_wdt_ops = {
375 .owner = THIS_MODULE,
376 .start = orion_wdt_start,
377 .stop = orion_wdt_stop,
378 .ping = orion_wdt_ping,
379 .get_timeleft = orion_wdt_get_timeleft,
380};
381
382static irqreturn_t orion_wdt_irq(int irq, void *devid)
383{
384 panic("Watchdog Timeout");
385 return IRQ_HANDLED;
386}
387
388static irqreturn_t orion_wdt_pre_irq(int irq, void *devid)
389{
390 struct orion_watchdog *dev = devid;
391
392 atomic_io_modify(dev->reg + TIMER_A370_STATUS,
393 TIMER1_STATUS_BIT, 0);
394 watchdog_notify_pretimeout(&dev->wdt);
395 return IRQ_HANDLED;
396}
397
398/*
399 * The original devicetree binding for this driver specified only
400 * one memory resource, so in order to keep DT backwards compatibility
401 * we try to fallback to a hardcoded register address, if the resource
402 * is missing from the devicetree.
403 */
404static void __iomem *orion_wdt_ioremap_rstout(struct platform_device *pdev,
405 phys_addr_t internal_regs)
406{
407 struct resource *res;
408 phys_addr_t rstout;
409
410 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
411 if (res)
412 return devm_ioremap(&pdev->dev, res->start,
413 resource_size(res));
414
415 rstout = internal_regs + ORION_RSTOUT_MASK_OFFSET;
416
417 WARN(1, FW_BUG "falling back to hardcoded RSTOUT reg %pa\n", &rstout);
418 return devm_ioremap(&pdev->dev, rstout, 0x4);
419}
420
421static const struct orion_watchdog_data orion_data = {
422 .rstout_enable_bit = BIT(1),
423 .wdt_enable_bit = BIT(4),
424 .wdt_counter_offset = 0x24,
425 .clock_init = orion_wdt_clock_init,
426 .enabled = orion_enabled,
427 .start = orion_start,
428 .stop = orion_stop,
429};
430
431static const struct orion_watchdog_data armada370_data = {
432 .rstout_enable_bit = BIT(8),
433 .wdt_enable_bit = BIT(8),
434 .wdt_counter_offset = 0x34,
435 .clock_init = armada370_wdt_clock_init,
436 .enabled = orion_enabled,
437 .start = armada370_start,
438 .stop = armada370_stop,
439};
440
441static const struct orion_watchdog_data armadaxp_data = {
442 .rstout_enable_bit = BIT(8),
443 .wdt_enable_bit = BIT(8),
444 .wdt_counter_offset = 0x34,
445 .clock_init = armadaxp_wdt_clock_init,
446 .enabled = orion_enabled,
447 .start = armada370_start,
448 .stop = armada370_stop,
449};
450
451static const struct orion_watchdog_data armada375_data = {
452 .rstout_enable_bit = BIT(8),
453 .rstout_mask_bit = BIT(10),
454 .wdt_enable_bit = BIT(8),
455 .wdt_counter_offset = 0x34,
456 .clock_init = armada375_wdt_clock_init,
457 .enabled = armada375_enabled,
458 .start = armada375_start,
459 .stop = armada375_stop,
460};
461
462static const struct orion_watchdog_data armada380_data = {
463 .rstout_enable_bit = BIT(8),
464 .rstout_mask_bit = BIT(10),
465 .wdt_enable_bit = BIT(8),
466 .wdt_counter_offset = 0x34,
467 .clock_init = armadaxp_wdt_clock_init,
468 .enabled = armada375_enabled,
469 .start = armada375_start,
470 .stop = armada375_stop,
471};
472
473static const struct of_device_id orion_wdt_of_match_table[] = {
474 {
475 .compatible = "marvell,orion-wdt",
476 .data = &orion_data,
477 },
478 {
479 .compatible = "marvell,armada-370-wdt",
480 .data = &armada370_data,
481 },
482 {
483 .compatible = "marvell,armada-xp-wdt",
484 .data = &armadaxp_data,
485 },
486 {
487 .compatible = "marvell,armada-375-wdt",
488 .data = &armada375_data,
489 },
490 {
491 .compatible = "marvell,armada-380-wdt",
492 .data = &armada380_data,
493 },
494 {},
495};
496MODULE_DEVICE_TABLE(of, orion_wdt_of_match_table);
497
498static int orion_wdt_get_regs(struct platform_device *pdev,
499 struct orion_watchdog *dev)
500{
501 struct device_node *node = pdev->dev.of_node;
502 struct resource *res;
503
504 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
505 if (!res)
506 return -ENODEV;
507 dev->reg = devm_ioremap(&pdev->dev, res->start,
508 resource_size(res));
509 if (!dev->reg)
510 return -ENOMEM;
511
512 /* Each supported compatible has some RSTOUT register quirk */
513 if (of_device_is_compatible(node, "marvell,orion-wdt")) {
514
515 dev->rstout = orion_wdt_ioremap_rstout(pdev, res->start &
516 INTERNAL_REGS_MASK);
517 if (!dev->rstout)
518 return -ENODEV;
519
520 } else if (of_device_is_compatible(node, "marvell,armada-370-wdt") ||
521 of_device_is_compatible(node, "marvell,armada-xp-wdt")) {
522
523 /* Dedicated RSTOUT register, can be requested. */
524 dev->rstout = devm_platform_ioremap_resource(pdev, 1);
525 if (IS_ERR(dev->rstout))
526 return PTR_ERR(dev->rstout);
527
528 } else if (of_device_is_compatible(node, "marvell,armada-375-wdt") ||
529 of_device_is_compatible(node, "marvell,armada-380-wdt")) {
530
531 /* Dedicated RSTOUT register, can be requested. */
532 dev->rstout = devm_platform_ioremap_resource(pdev, 1);
533 if (IS_ERR(dev->rstout))
534 return PTR_ERR(dev->rstout);
535
536 res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
537 if (!res)
538 return -ENODEV;
539 dev->rstout_mask = devm_ioremap(&pdev->dev, res->start,
540 resource_size(res));
541 if (!dev->rstout_mask)
542 return -ENOMEM;
543
544 } else {
545 return -ENODEV;
546 }
547
548 return 0;
549}
550
551static int orion_wdt_probe(struct platform_device *pdev)
552{
553 struct orion_watchdog *dev;
554 const struct of_device_id *match;
555 unsigned int wdt_max_duration; /* (seconds) */
556 int ret, irq;
557
558 dev = devm_kzalloc(&pdev->dev, sizeof(struct orion_watchdog),
559 GFP_KERNEL);
560 if (!dev)
561 return -ENOMEM;
562
563 match = of_match_device(orion_wdt_of_match_table, &pdev->dev);
564 if (!match)
565 /* Default legacy match */
566 match = &orion_wdt_of_match_table[0];
567
568 dev->wdt.info = &orion_wdt_info;
569 dev->wdt.ops = &orion_wdt_ops;
570 dev->wdt.min_timeout = 1;
571 dev->data = match->data;
572
573 ret = orion_wdt_get_regs(pdev, dev);
574 if (ret)
575 return ret;
576
577 ret = dev->data->clock_init(pdev, dev);
578 if (ret) {
579 dev_err(&pdev->dev, "cannot initialize clock\n");
580 return ret;
581 }
582
583 wdt_max_duration = WDT_MAX_CYCLE_COUNT / dev->clk_rate;
584
585 dev->wdt.timeout = wdt_max_duration;
586 dev->wdt.max_timeout = wdt_max_duration;
587 dev->wdt.parent = &pdev->dev;
588 watchdog_init_timeout(&dev->wdt, heartbeat, &pdev->dev);
589
590 platform_set_drvdata(pdev, &dev->wdt);
591 watchdog_set_drvdata(&dev->wdt, dev);
592
593 /*
594 * Let's make sure the watchdog is fully stopped, unless it's
595 * explicitly enabled. This may be the case if the module was
596 * removed and re-inserted, or if the bootloader explicitly
597 * set a running watchdog before booting the kernel.
598 */
599 if (!orion_wdt_enabled(&dev->wdt))
600 orion_wdt_stop(&dev->wdt);
601 else
602 set_bit(WDOG_HW_RUNNING, &dev->wdt.status);
603
604 /* Request the IRQ only after the watchdog is disabled */
605 irq = platform_get_irq_optional(pdev, 0);
606 if (irq > 0) {
607 /*
608 * Not all supported platforms specify an interrupt for the
609 * watchdog, so let's make it optional.
610 */
611 ret = devm_request_irq(&pdev->dev, irq, orion_wdt_irq, 0,
612 pdev->name, dev);
613 if (ret < 0) {
614 dev_err(&pdev->dev, "failed to request IRQ\n");
615 goto disable_clk;
616 }
617 }
618
619 /* Optional 2nd interrupt for pretimeout */
620 irq = platform_get_irq_optional(pdev, 1);
621 if (irq > 0) {
622 orion_wdt_info.options |= WDIOF_PRETIMEOUT;
623 ret = devm_request_irq(&pdev->dev, irq, orion_wdt_pre_irq,
624 0, pdev->name, dev);
625 if (ret < 0) {
626 dev_err(&pdev->dev, "failed to request IRQ\n");
627 goto disable_clk;
628 }
629 }
630
631
632 watchdog_set_nowayout(&dev->wdt, nowayout);
633 ret = watchdog_register_device(&dev->wdt);
634 if (ret)
635 goto disable_clk;
636
637 pr_info("Initial timeout %d sec%s\n",
638 dev->wdt.timeout, nowayout ? ", nowayout" : "");
639 return 0;
640
641disable_clk:
642 clk_disable_unprepare(dev->clk);
643 clk_put(dev->clk);
644 return ret;
645}
646
647static int orion_wdt_remove(struct platform_device *pdev)
648{
649 struct watchdog_device *wdt_dev = platform_get_drvdata(pdev);
650 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
651
652 watchdog_unregister_device(wdt_dev);
653 clk_disable_unprepare(dev->clk);
654 clk_put(dev->clk);
655 return 0;
656}
657
658static void orion_wdt_shutdown(struct platform_device *pdev)
659{
660 struct watchdog_device *wdt_dev = platform_get_drvdata(pdev);
661 orion_wdt_stop(wdt_dev);
662}
663
664static struct platform_driver orion_wdt_driver = {
665 .probe = orion_wdt_probe,
666 .remove = orion_wdt_remove,
667 .shutdown = orion_wdt_shutdown,
668 .driver = {
669 .name = "orion_wdt",
670 .of_match_table = orion_wdt_of_match_table,
671 },
672};
673
674module_platform_driver(orion_wdt_driver);
675
676MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>");
677MODULE_DESCRIPTION("Orion Processor Watchdog");
678
679module_param(heartbeat, int, 0);
680MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds");
681
682module_param(nowayout, bool, 0);
683MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
684 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
685
686MODULE_LICENSE("GPL v2");
687MODULE_ALIAS("platform:orion_wdt");