修改内核路径

hc

2024-05-14 bedbef8ad3e75a304af6361af235302bcc61d06b

 kernel/drivers/watchdog/sama5d4_wdt.c
..
..
@@ -1,9 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  * Driver for Atmel SAMA5D4 Watchdog Timer
3
4
  *
4
- * Copyright (C) 2015 Atmel Corporation
5
- *
6
- * Licensed under GPLv2.
5
+ * Copyright (C) 2015-2019 Microchip Technology Inc. and its subsidiaries
7
6
  */
8
7
 
9
8
 #include <linux/delay.h>
..
..
@@ -12,6 +11,7 @@
12
11
 #include <linux/kernel.h>
13
12
 #include <linux/module.h>
14
13
 #include <linux/of.h>
14
+#include <linux/of_device.h>
15
15
 #include <linux/of_irq.h>
16
16
 #include <linux/platform_device.h>
17
17
 #include <linux/reboot.h>
..
..
@@ -30,7 +30,10 @@
30
30
 	struct watchdog_device	wdd;
31
31
 	void __iomem		*reg_base;
32
32
 	u32			mr;
33
+	u32			ir;
33
34
 	unsigned long		last_ping;
35
+	bool			need_irq;
36
+	bool			sam9x60_support;
34
37
 };
35
38
 
36
39
 static int wdt_timeout;
..
..
@@ -79,7 +82,12 @@
79
82
 {
80
83
 	struct sama5d4_wdt *wdt = watchdog_get_drvdata(wdd);
81
84
 
82
-	wdt->mr &= ~AT91_WDT_WDDIS;
85
+	if (wdt->sam9x60_support) {
86
+		writel_relaxed(wdt->ir, wdt->reg_base + AT91_SAM9X60_IER);
87
+		wdt->mr &= ~AT91_SAM9X60_WDDIS;
88
+	} else {
89
+		wdt->mr &= ~AT91_WDT_WDDIS;
90
+	}
83
91
 	wdt_write(wdt, AT91_WDT_MR, wdt->mr);
84
92
 
85
93
 	return 0;
..
..
@@ -89,7 +97,12 @@
89
97
 {
90
98
 	struct sama5d4_wdt *wdt = watchdog_get_drvdata(wdd);
91
99
 
92
-	wdt->mr |= AT91_WDT_WDDIS;
100
+	if (wdt->sam9x60_support) {
101
+		writel_relaxed(wdt->ir, wdt->reg_base + AT91_SAM9X60_IDR);
102
+		wdt->mr |= AT91_SAM9X60_WDDIS;
103
+	} else {
104
+		wdt->mr |= AT91_WDT_WDDIS;
105
+	}
93
106
 	wdt_write(wdt, AT91_WDT_MR, wdt->mr);
94
107
 
95
108
 	return 0;
..
..
@@ -109,6 +122,14 @@
109
122
 {
110
123
 	struct sama5d4_wdt *wdt = watchdog_get_drvdata(wdd);
111
124
 	u32 value = WDT_SEC2TICKS(timeout);
125
+
126
+	if (wdt->sam9x60_support) {
127
+		wdt_write(wdt, AT91_SAM9X60_WLR,
128
+			  AT91_SAM9X60_SET_COUNTER(value));
129
+
130
+		wdd->timeout = timeout;
131
+		return 0;
132
+	}
112
133
 
113
134
 	wdt->mr &= ~AT91_WDT_WDV;
114
135
 	wdt->mr |= AT91_WDT_SET_WDV(value);
..
..
@@ -144,8 +165,14 @@
144
165
 static irqreturn_t sama5d4_wdt_irq_handler(int irq, void *dev_id)
145
166
 {
146
167
 	struct sama5d4_wdt *wdt = platform_get_drvdata(dev_id);
168
+	u32 reg;
147
169
 
148
-	if (wdt_read(wdt, AT91_WDT_SR)) {
170
+	if (wdt->sam9x60_support)
171
+		reg = wdt_read(wdt, AT91_SAM9X60_ISR);
172
+	else
173
+		reg = wdt_read(wdt, AT91_WDT_SR);
174
+
175
+	if (reg) {
149
176
 		pr_crit("Atmel Watchdog Software Reset\n");
150
177
 		emergency_restart();
151
178
 		pr_crit("Reboot didn't succeed\n");
..
..
@@ -158,13 +185,14 @@
158
185
 {
159
186
 	const char *tmp;
160
187
 
161
-	wdt->mr = AT91_WDT_WDDIS;
188
+	if (wdt->sam9x60_support)
189
+		wdt->mr = AT91_SAM9X60_WDDIS;
190
+	else
191
+		wdt->mr = AT91_WDT_WDDIS;
162
192
 
163
193
 	if (!of_property_read_string(np, "atmel,watchdog-type", &tmp) &&
164
194
 	    !strcmp(tmp, "software"))
165
-		wdt->mr |= AT91_WDT_WDFIEN;
166
-	else
167
-		wdt->mr |= AT91_WDT_WDRSTEN;
195
+		wdt->need_irq = true;
168
196
 
169
197
 	if (of_property_read_bool(np, "atmel,idle-halt"))
170
198
 		wdt->mr |= AT91_WDT_WDIDLEHLT;
..
..
@@ -177,35 +205,59 @@
177
205
 
178
206
 static int sama5d4_wdt_init(struct sama5d4_wdt *wdt)
179
207
 {
180
-	u32 reg;
208
+	u32 reg, val;
209
+
210
+	val = WDT_SEC2TICKS(WDT_DEFAULT_TIMEOUT);
181
211
 	/*
182
212
 	 * When booting and resuming, the bootloader may have changed the
183
213
 	 * watchdog configuration.
184
214
 	 * If the watchdog is already running, we can safely update it.
185
215
 	 * Else, we have to disable it properly.
186
216
 	 */
187
-	if (wdt_enabled) {
188
-		wdt_write_nosleep(wdt, AT91_WDT_MR, wdt->mr);
189
-	} else {
217
+	if (!wdt_enabled) {
190
218
 		reg = wdt_read(wdt, AT91_WDT_MR);
191
-		if (!(reg & AT91_WDT_WDDIS))
219
+		if (wdt->sam9x60_support && (!(reg & AT91_SAM9X60_WDDIS)))
220
+			wdt_write_nosleep(wdt, AT91_WDT_MR,
221
+					  reg | AT91_SAM9X60_WDDIS);
222
+		else if (!wdt->sam9x60_support &&
223
+			 (!(reg & AT91_WDT_WDDIS)))
192
224
 			wdt_write_nosleep(wdt, AT91_WDT_MR,
193
225
 					  reg | AT91_WDT_WDDIS);
194
226
 	}
227
+
228
+	if (wdt->sam9x60_support) {
229
+		if (wdt->need_irq)
230
+			wdt->ir = AT91_SAM9X60_PERINT;
231
+		else
232
+			wdt->mr |= AT91_SAM9X60_PERIODRST;
233
+
234
+		wdt_write(wdt, AT91_SAM9X60_IER, wdt->ir);
235
+		wdt_write(wdt, AT91_SAM9X60_WLR, AT91_SAM9X60_SET_COUNTER(val));
236
+	} else {
237
+		wdt->mr |= AT91_WDT_SET_WDD(WDT_SEC2TICKS(MAX_WDT_TIMEOUT));
238
+		wdt->mr |= AT91_WDT_SET_WDV(val);
239
+
240
+		if (wdt->need_irq)
241
+			wdt->mr |= AT91_WDT_WDFIEN;
242
+		else
243
+			wdt->mr |= AT91_WDT_WDRSTEN;
244
+	}
245
+
246
+	wdt_write_nosleep(wdt, AT91_WDT_MR, wdt->mr);
247
+
195
248
 	return 0;
196
249
 }
197
250
 
198
251
 static int sama5d4_wdt_probe(struct platform_device *pdev)
199
252
 {
253
+	struct device *dev = &pdev->dev;
200
254
 	struct watchdog_device *wdd;
201
255
 	struct sama5d4_wdt *wdt;
202
-	struct resource *res;
203
256
 	void __iomem *regs;
204
257
 	u32 irq = 0;
205
-	u32 timeout;
206
258
 	int ret;
207
259
 
208
-	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
260
+	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
209
261
 	if (!wdt)
210
262
 		return -ENOMEM;
211
263
 
..
..
@@ -216,41 +268,40 @@
216
268
 	wdd->min_timeout = MIN_WDT_TIMEOUT;
217
269
 	wdd->max_timeout = MAX_WDT_TIMEOUT;
218
270
 	wdt->last_ping = jiffies;
271
+	wdt->sam9x60_support = of_device_is_compatible(dev->of_node,
272
+						       "microchip,sam9x60-wdt");
219
273
 
220
274
 	watchdog_set_drvdata(wdd, wdt);
221
275
 
222
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
223
-	regs = devm_ioremap_resource(&pdev->dev, res);
276
+	regs = devm_platform_ioremap_resource(pdev, 0);
224
277
 	if (IS_ERR(regs))
225
278
 		return PTR_ERR(regs);
226
279
 
227
280
 	wdt->reg_base = regs;
228
281
 
229
-	irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
230
-	if (!irq)
231
-		dev_warn(&pdev->dev, "failed to get IRQ from DT\n");
232
-
233
-	ret = of_sama5d4_wdt_init(pdev->dev.of_node, wdt);
282
+	ret = of_sama5d4_wdt_init(dev->of_node, wdt);
234
283
 	if (ret)
235
284
 		return ret;
236
285
 
237
-	if ((wdt->mr & AT91_WDT_WDFIEN) && irq) {
238
-		ret = devm_request_irq(&pdev->dev, irq, sama5d4_wdt_irq_handler,
286
+	if (wdt->need_irq) {
287
+		irq = irq_of_parse_and_map(dev->of_node, 0);
288
+		if (!irq) {
289
+			dev_warn(dev, "failed to get IRQ from DT\n");
290
+			wdt->need_irq = false;
291
+		}
292
+	}
293
+
294
+	if (wdt->need_irq) {
295
+		ret = devm_request_irq(dev, irq, sama5d4_wdt_irq_handler,
239
296
 				       IRQF_SHARED | IRQF_IRQPOLL |
240
297
 				       IRQF_NO_SUSPEND, pdev->name, pdev);
241
298
 		if (ret) {
242
-			dev_err(&pdev->dev,
243
-				"cannot register interrupt handler\n");
299
+			dev_err(dev, "cannot register interrupt handler\n");
244
300
 			return ret;
245
301
 		}
246
302
 	}
247
303
 
248
-	watchdog_init_timeout(wdd, wdt_timeout, &pdev->dev);
249
-
250
-	timeout = WDT_SEC2TICKS(wdd->timeout);
251
-
252
-	wdt->mr |= AT91_WDT_SET_WDD(WDT_SEC2TICKS(MAX_WDT_TIMEOUT));
253
-	wdt->mr |= AT91_WDT_SET_WDV(timeout);
304
+	watchdog_init_timeout(wdd, wdt_timeout, dev);
254
305
 
255
306
 	ret = sama5d4_wdt_init(wdt);
256
307
 	if (ret)
..
..
@@ -258,39 +309,42 @@
258
309
 
259
310
 	watchdog_set_nowayout(wdd, nowayout);
260
311
 
261
-	ret = watchdog_register_device(wdd);
262
-	if (ret) {
263
-		dev_err(&pdev->dev, "failed to register watchdog device\n");
312
+	watchdog_stop_on_unregister(wdd);
313
+	ret = devm_watchdog_register_device(dev, wdd);
314
+	if (ret)
264
315
 		return ret;
265
-	}
266
316
 
267
317
 	platform_set_drvdata(pdev, wdt);
268
318
 
269
-	dev_info(&pdev->dev, "initialized (timeout = %d sec, nowayout = %d)\n",
319
+	dev_info(dev, "initialized (timeout = %d sec, nowayout = %d)\n",
270
320
 		 wdd->timeout, nowayout);
271
321
 
272
322
 	return 0;
273
323
 }
274
324
 
275
-static int sama5d4_wdt_remove(struct platform_device *pdev)
276
-{
277
-	struct sama5d4_wdt *wdt = platform_get_drvdata(pdev);
278
-
279
-	sama5d4_wdt_stop(&wdt->wdd);
280
-
281
-	watchdog_unregister_device(&wdt->wdd);
282
-
283
-	return 0;
284
-}
285
-
286
325
 static const struct of_device_id sama5d4_wdt_of_match[] = {
287
-	{ .compatible = "atmel,sama5d4-wdt", },
326
+	{
327
+		.compatible = "atmel,sama5d4-wdt",
328
+	},
329
+	{
330
+		.compatible = "microchip,sam9x60-wdt",
331
+	},
288
332
 	{ }
289
333
 };
290
334
 MODULE_DEVICE_TABLE(of, sama5d4_wdt_of_match);
291
335
 
292
336
 #ifdef CONFIG_PM_SLEEP
293
-static int sama5d4_wdt_resume(struct device *dev)
337
+static int sama5d4_wdt_suspend_late(struct device *dev)
338
+{
339
+	struct sama5d4_wdt *wdt = dev_get_drvdata(dev);
340
+
341
+	if (watchdog_active(&wdt->wdd))
342
+		sama5d4_wdt_stop(&wdt->wdd);
343
+
344
+	return 0;
345
+}
346
+
347
+static int sama5d4_wdt_resume_early(struct device *dev)
294
348
 {
295
349
 	struct sama5d4_wdt *wdt = dev_get_drvdata(dev);
296
350
 
..
..
@@ -301,16 +355,20 @@
301
355
 	 */
302
356
 	sama5d4_wdt_init(wdt);
303
357
 
358
+	if (watchdog_active(&wdt->wdd))
359
+		sama5d4_wdt_start(&wdt->wdd);
360
+
304
361
 	return 0;
305
362
 }
306
363
 #endif
307
364
 
308
-static SIMPLE_DEV_PM_OPS(sama5d4_wdt_pm_ops, NULL,
309
-			 sama5d4_wdt_resume);
365
+static const struct dev_pm_ops sama5d4_wdt_pm_ops = {
366
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(sama5d4_wdt_suspend_late,
367
+			sama5d4_wdt_resume_early)
368
+};
310
369
 
311
370
 static struct platform_driver sama5d4_wdt_driver = {
312
371
 	.probe		= sama5d4_wdt_probe,
313
-	.remove		= sama5d4_wdt_remove,
314
372
 	.driver		= {
315
373
 		.name	= "sama5d4_wdt",
316
374
 		.pm	= &sama5d4_wdt_pm_ops,