add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/drivers/watchdog/qcom-wdt.c
..
..
@@ -1,17 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 and
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- * only version 2 as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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3
  */
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+#include <linux/bits.h>
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5
 #include <linux/clk.h>
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6
 #include <linux/delay.h>
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+#include <linux/interrupt.h>
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8
 #include <linux/io.h>
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9
 #include <linux/kernel.h>
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10
 #include <linux/module.h>
..
..
@@ -27,6 +20,8 @@
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20
 	WDT_BARK_TIME,
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21
 	WDT_BITE_TIME,
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22
 };
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+
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+#define QCOM_WDT_ENABLE		BIT(0)
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25
 
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 static const u32 reg_offset_data_apcs_tmr[] = {
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27
 	[WDT_RST] = 0x38,
..
..
@@ -44,9 +39,13 @@
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 	[WDT_BITE_TIME] = 0x14,
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40
 };
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41
 
42
+struct qcom_wdt_match_data {
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+	const u32 *offset;
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+	bool pretimeout;
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+};
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+
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47
 struct qcom_wdt {
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48
 	struct watchdog_device	wdd;
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-	struct clk		*clk;
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49
 	unsigned long		rate;
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50
 	void __iomem		*base;
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51
 	const u32		*layout;
..
..
@@ -63,15 +62,25 @@
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 	return container_of(wdd, struct qcom_wdt, wdd);
64
63
 }
65
64
 
65
+static irqreturn_t qcom_wdt_isr(int irq, void *arg)
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+{
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+	struct watchdog_device *wdd = arg;
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+
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+	watchdog_notify_pretimeout(wdd);
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+
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+	return IRQ_HANDLED;
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+}
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+
66
74
 static int qcom_wdt_start(struct watchdog_device *wdd)
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75
 {
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 	struct qcom_wdt *wdt = to_qcom_wdt(wdd);
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+	unsigned int bark = wdd->timeout - wdd->pretimeout;
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78
 
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 	writel(0, wdt_addr(wdt, WDT_EN));
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80
 	writel(1, wdt_addr(wdt, WDT_RST));
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-	writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BARK_TIME));
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+	writel(bark * wdt->rate, wdt_addr(wdt, WDT_BARK_TIME));
73
82
 	writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BITE_TIME));
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-	writel(1, wdt_addr(wdt, WDT_EN));
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+	writel(QCOM_WDT_ENABLE, wdt_addr(wdt, WDT_EN));
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84
 	return 0;
76
85
 }
77
86
 
..
..
@@ -98,6 +107,13 @@
98
107
 	return qcom_wdt_start(wdd);
99
108
 }
100
109
 
110
+static int qcom_wdt_set_pretimeout(struct watchdog_device *wdd,
111
+				   unsigned int timeout)
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+{
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+	wdd->pretimeout = timeout;
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+	return qcom_wdt_start(wdd);
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+}
116
+
101
117
 static int qcom_wdt_restart(struct watchdog_device *wdd, unsigned long action,
102
118
 			    void *data)
103
119
 {
..
..
@@ -114,7 +130,7 @@
114
130
 	writel(1, wdt_addr(wdt, WDT_RST));
115
131
 	writel(timeout, wdt_addr(wdt, WDT_BARK_TIME));
116
132
 	writel(timeout, wdt_addr(wdt, WDT_BITE_TIME));
117
-	writel(1, wdt_addr(wdt, WDT_EN));
133
+	writel(QCOM_WDT_ENABLE, wdt_addr(wdt, WDT_EN));
118
134
 
119
135
 	/*
120
136
 	 * Actually make sure the above sequence hits hardware before sleeping.
..
..
@@ -130,6 +146,7 @@
130
146
 	.stop		= qcom_wdt_stop,
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147
 	.ping		= qcom_wdt_ping,
132
148
 	.set_timeout	= qcom_wdt_set_timeout,
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+	.set_pretimeout	= qcom_wdt_set_pretimeout,
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 	.restart        = qcom_wdt_restart,
134
151
 	.owner		= THIS_MODULE,
135
152
 };
..
..
@@ -142,22 +159,48 @@
142
159
 	.identity	= KBUILD_MODNAME,
143
160
 };
144
161
 
162
+static const struct watchdog_info qcom_wdt_pt_info = {
163
+	.options	= WDIOF_KEEPALIVEPING
164
+			| WDIOF_MAGICCLOSE
165
+			| WDIOF_SETTIMEOUT
166
+			| WDIOF_PRETIMEOUT
167
+			| WDIOF_CARDRESET,
168
+	.identity	= KBUILD_MODNAME,
169
+};
170
+
171
+static void qcom_clk_disable_unprepare(void *data)
172
+{
173
+	clk_disable_unprepare(data);
174
+}
175
+
176
+static const struct qcom_wdt_match_data match_data_apcs_tmr = {
177
+	.offset = reg_offset_data_apcs_tmr,
178
+	.pretimeout = false,
179
+};
180
+
181
+static const struct qcom_wdt_match_data match_data_kpss = {
182
+	.offset = reg_offset_data_kpss,
183
+	.pretimeout = true,
184
+};
185
+
145
186
 static int qcom_wdt_probe(struct platform_device *pdev)
146
187
 {
188
+	struct device *dev = &pdev->dev;
147
189
 	struct qcom_wdt *wdt;
148
190
 	struct resource *res;
149
-	struct device_node *np = pdev->dev.of_node;
150
-	const u32 *regs;
191
+	struct device_node *np = dev->of_node;
192
+	const struct qcom_wdt_match_data *data;
151
193
 	u32 percpu_offset;
152
-	int ret;
194
+	int irq, ret;
195
+	struct clk *clk;
153
196
 
154
-	regs = of_device_get_match_data(&pdev->dev);
155
-	if (!regs) {
156
-		dev_err(&pdev->dev, "Unsupported QCOM WDT module\n");
197
+	data = of_device_get_match_data(dev);
198
+	if (!data) {
199
+		dev_err(dev, "Unsupported QCOM WDT module\n");
157
200
 		return -ENODEV;
158
201
 	}
159
202
 
160
-	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
203
+	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
161
204
 	if (!wdt)
162
205
 		return -ENOMEM;
163
206
 
..
..
@@ -172,21 +215,24 @@
172
215
 	res->start += percpu_offset;
173
216
 	res->end += percpu_offset;
174
217
 
175
-	wdt->base = devm_ioremap_resource(&pdev->dev, res);
218
+	wdt->base = devm_ioremap_resource(dev, res);
176
219
 	if (IS_ERR(wdt->base))
177
220
 		return PTR_ERR(wdt->base);
178
221
 
179
-	wdt->clk = devm_clk_get(&pdev->dev, NULL);
180
-	if (IS_ERR(wdt->clk)) {
181
-		dev_err(&pdev->dev, "failed to get input clock\n");
182
-		return PTR_ERR(wdt->clk);
222
+	clk = devm_clk_get(dev, NULL);
223
+	if (IS_ERR(clk)) {
224
+		dev_err(dev, "failed to get input clock\n");
225
+		return PTR_ERR(clk);
183
226
 	}
184
227
 
185
-	ret = clk_prepare_enable(wdt->clk);
228
+	ret = clk_prepare_enable(clk);
186
229
 	if (ret) {
187
-		dev_err(&pdev->dev, "failed to setup clock\n");
230
+		dev_err(dev, "failed to setup clock\n");
188
231
 		return ret;
189
232
 	}
233
+	ret = devm_add_action_or_reset(dev, qcom_clk_disable_unprepare, clk);
234
+	if (ret)
235
+		return ret;
190
236
 
191
237
 	/*
192
238
 	 * We use the clock rate to calculate the max timeout, so ensure it's
..
..
@@ -196,20 +242,35 @@
196
242
 	 * that it would bite before a second elapses it's usefulness is
197
243
 	 * limited.  Bail if this is the case.
198
244
 	 */
199
-	wdt->rate = clk_get_rate(wdt->clk);
245
+	wdt->rate = clk_get_rate(clk);
200
246
 	if (wdt->rate == 0 ||
201
247
 	    wdt->rate > 0x10000000U) {
202
-		dev_err(&pdev->dev, "invalid clock rate\n");
203
-		ret = -EINVAL;
204
-		goto err_clk_unprepare;
248
+		dev_err(dev, "invalid clock rate\n");
249
+		return -EINVAL;
205
250
 	}
206
251
 
207
-	wdt->wdd.info = &qcom_wdt_info;
252
+	/* check if there is pretimeout support */
253
+	irq = platform_get_irq_optional(pdev, 0);
254
+	if (data->pretimeout && irq > 0) {
255
+		ret = devm_request_irq(dev, irq, qcom_wdt_isr, 0,
256
+				       "wdt_bark", &wdt->wdd);
257
+		if (ret)
258
+			return ret;
259
+
260
+		wdt->wdd.info = &qcom_wdt_pt_info;
261
+		wdt->wdd.pretimeout = 1;
262
+	} else {
263
+		if (irq == -EPROBE_DEFER)
264
+			return -EPROBE_DEFER;
265
+
266
+		wdt->wdd.info = &qcom_wdt_info;
267
+	}
268
+
208
269
 	wdt->wdd.ops = &qcom_wdt_ops;
209
270
 	wdt->wdd.min_timeout = 1;
210
271
 	wdt->wdd.max_timeout = 0x10000000U / wdt->rate;
211
-	wdt->wdd.parent = &pdev->dev;
212
-	wdt->layout = regs;
272
+	wdt->wdd.parent = dev;
273
+	wdt->layout = data->offset;
213
274
 
214
275
 	if (readl(wdt_addr(wdt, WDT_STS)) & 1)
215
276
 		wdt->wdd.bootstatus = WDIOF_CARDRESET;
..
..
@@ -220,45 +281,52 @@
220
281
 	 * the max instead.
221
282
 	 */
222
283
 	wdt->wdd.timeout = min(wdt->wdd.max_timeout, 30U);
223
-	watchdog_init_timeout(&wdt->wdd, 0, &pdev->dev);
284
+	watchdog_init_timeout(&wdt->wdd, 0, dev);
224
285
 
225
-	ret = watchdog_register_device(&wdt->wdd);
226
-	if (ret) {
227
-		dev_err(&pdev->dev, "failed to register watchdog\n");
228
-		goto err_clk_unprepare;
229
-	}
286
+	ret = devm_watchdog_register_device(dev, &wdt->wdd);
287
+	if (ret)
288
+		return ret;
230
289
 
231
290
 	platform_set_drvdata(pdev, wdt);
232
291
 	return 0;
233
-
234
-err_clk_unprepare:
235
-	clk_disable_unprepare(wdt->clk);
236
-	return ret;
237
292
 }
238
293
 
239
-static int qcom_wdt_remove(struct platform_device *pdev)
294
+static int __maybe_unused qcom_wdt_suspend(struct device *dev)
240
295
 {
241
-	struct qcom_wdt *wdt = platform_get_drvdata(pdev);
296
+	struct qcom_wdt *wdt = dev_get_drvdata(dev);
242
297
 
243
-	watchdog_unregister_device(&wdt->wdd);
244
-	clk_disable_unprepare(wdt->clk);
298
+	if (watchdog_active(&wdt->wdd))
299
+		qcom_wdt_stop(&wdt->wdd);
300
+
245
301
 	return 0;
246
302
 }
247
303
 
304
+static int __maybe_unused qcom_wdt_resume(struct device *dev)
305
+{
306
+	struct qcom_wdt *wdt = dev_get_drvdata(dev);
307
+
308
+	if (watchdog_active(&wdt->wdd))
309
+		qcom_wdt_start(&wdt->wdd);
310
+
311
+	return 0;
312
+}
313
+
314
+static SIMPLE_DEV_PM_OPS(qcom_wdt_pm_ops, qcom_wdt_suspend, qcom_wdt_resume);
315
+
248
316
 static const struct of_device_id qcom_wdt_of_table[] = {
249
-	{ .compatible = "qcom,kpss-timer", .data = reg_offset_data_apcs_tmr },
250
-	{ .compatible = "qcom,scss-timer", .data = reg_offset_data_apcs_tmr },
251
-	{ .compatible = "qcom,kpss-wdt", .data = reg_offset_data_kpss },
317
+	{ .compatible = "qcom,kpss-timer", .data = &match_data_apcs_tmr },
318
+	{ .compatible = "qcom,scss-timer", .data = &match_data_apcs_tmr },
319
+	{ .compatible = "qcom,kpss-wdt", .data = &match_data_kpss },
252
320
 	{ },
253
321
 };
254
322
 MODULE_DEVICE_TABLE(of, qcom_wdt_of_table);
255
323
 
256
324
 static struct platform_driver qcom_watchdog_driver = {
257
325
 	.probe	= qcom_wdt_probe,
258
-	.remove	= qcom_wdt_remove,
259
326
 	.driver	= {
260
327
 		.name		= KBUILD_MODNAME,
261
328
 		.of_match_table	= qcom_wdt_of_table,
329
+		.pm		= &qcom_wdt_pm_ops,
262
330
 	},
263
331
 };
264
332
 module_platform_driver(qcom_watchdog_driver);