1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Qualcomm Peripheral Image Loader for Q6V5
4  *
5  * Copyright (C) 2016-2018 Linaro Ltd.
6  * Copyright (C) 2014 Sony Mobile Communications AB
7  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
8  */
9 #include <linux/kernel.h>
10 #include <linux/platform_device.h>
11 #include <linux/interconnect.h>
12 #include <linux/interrupt.h>
13 #include <linux/module.h>
14 #include <linux/soc/qcom/qcom_aoss.h>
15 #include <linux/soc/qcom/smem.h>
16 #include <linux/soc/qcom/smem_state.h>
17 #include <linux/remoteproc.h>
18 #include "qcom_common.h"
19 #include "qcom_q6v5.h"
20 
21 #define Q6V5_LOAD_STATE_MSG_LEN	64
22 #define Q6V5_PANIC_DELAY_MS	200
23 
24 static int q6v5_load_state_toggle(struct qcom_q6v5 *q6v5, bool enable)
25 {
26 	char buf[Q6V5_LOAD_STATE_MSG_LEN];
27 	int ret;
28 
29 	if (!q6v5->qmp)
30 		return 0;
31 
32 	ret = snprintf(buf, sizeof(buf),
33 		       "{class: image, res: load_state, name: %s, val: %s}",
34 		       q6v5->load_state, enable ? "on" : "off");
35 
36 	WARN_ON(ret >= Q6V5_LOAD_STATE_MSG_LEN);
37 
38 	ret = qmp_send(q6v5->qmp, buf, sizeof(buf));
39 	if (ret)
40 		dev_err(q6v5->dev, "failed to toggle load state\n");
41 
42 	return ret;
43 }
44 
45 /**
46  * qcom_q6v5_prepare() - reinitialize the qcom_q6v5 context before start
47  * @q6v5:	reference to qcom_q6v5 context to be reinitialized
48  *
49  * Return: 0 on success, negative errno on failure
50  */
51 int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5)
52 {
53 	int ret;
54 
55 	ret = icc_set_bw(q6v5->path, 0, UINT_MAX);
56 	if (ret < 0) {
57 		dev_err(q6v5->dev, "failed to set bandwidth request\n");
58 		return ret;
59 	}
60 
61 	ret = q6v5_load_state_toggle(q6v5, true);
62 	if (ret) {
63 		icc_set_bw(q6v5->path, 0, 0);
64 		return ret;
65 	}
66 
67 	reinit_completion(&q6v5->start_done);
68 	reinit_completion(&q6v5->stop_done);
69 
70 	q6v5->running = true;
71 	q6v5->handover_issued = false;
72 
73 	enable_irq(q6v5->handover_irq);
74 
75 	return 0;
76 }
77 EXPORT_SYMBOL_GPL(qcom_q6v5_prepare);
78 
79 /**
80  * qcom_q6v5_unprepare() - unprepare the qcom_q6v5 context after stop
81  * @q6v5:	reference to qcom_q6v5 context to be unprepared
82  *
83  * Return: 0 on success, 1 if handover hasn't yet been called
84  */
85 int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5)
86 {
87 	disable_irq(q6v5->handover_irq);
88 	q6v5_load_state_toggle(q6v5, false);
89 
90 	/* Disable interconnect vote, in case handover never happened */
91 	icc_set_bw(q6v5->path, 0, 0);
92 
93 	return !q6v5->handover_issued;
94 }
95 EXPORT_SYMBOL_GPL(qcom_q6v5_unprepare);
96 
97 static irqreturn_t q6v5_wdog_interrupt(int irq, void *data)
98 {
99 	struct qcom_q6v5 *q6v5 = data;
100 	size_t len;
101 	char *msg;
102 
103 	/* Sometimes the stop triggers a watchdog rather than a stop-ack */
104 	if (!q6v5->running) {
105 		complete(&q6v5->stop_done);
106 		return IRQ_HANDLED;
107 	}
108 
109 	msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
110 	if (!IS_ERR(msg) && len > 0 && msg[0])
111 		dev_err(q6v5->dev, "watchdog received: %s\n", msg);
112 	else
113 		dev_err(q6v5->dev, "watchdog without message\n");
114 
115 	q6v5->running = false;
116 	rproc_report_crash(q6v5->rproc, RPROC_WATCHDOG);
117 
118 	return IRQ_HANDLED;
119 }
120 
121 static irqreturn_t q6v5_fatal_interrupt(int irq, void *data)
122 {
123 	struct qcom_q6v5 *q6v5 = data;
124 	size_t len;
125 	char *msg;
126 
127 	if (!q6v5->running)
128 		return IRQ_HANDLED;
129 
130 	msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
131 	if (!IS_ERR(msg) && len > 0 && msg[0])
132 		dev_err(q6v5->dev, "fatal error received: %s\n", msg);
133 	else
134 		dev_err(q6v5->dev, "fatal error without message\n");
135 
136 	q6v5->running = false;
137 	rproc_report_crash(q6v5->rproc, RPROC_FATAL_ERROR);
138 
139 	return IRQ_HANDLED;
140 }
141 
142 static irqreturn_t q6v5_ready_interrupt(int irq, void *data)
143 {
144 	struct qcom_q6v5 *q6v5 = data;
145 
146 	complete(&q6v5->start_done);
147 
148 	return IRQ_HANDLED;
149 }
150 
151 /**
152  * qcom_q6v5_wait_for_start() - wait for remote processor start signal
153  * @q6v5:	reference to qcom_q6v5 context
154  * @timeout:	timeout to wait for the event, in jiffies
155  *
156  * qcom_q6v5_unprepare() should not be called when this function fails.
157  *
158  * Return: 0 on success, -ETIMEDOUT on timeout
159  */
160 int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout)
161 {
162 	int ret;
163 
164 	ret = wait_for_completion_timeout(&q6v5->start_done, timeout);
165 	if (!ret)
166 		disable_irq(q6v5->handover_irq);
167 
168 	return !ret ? -ETIMEDOUT : 0;
169 }
170 EXPORT_SYMBOL_GPL(qcom_q6v5_wait_for_start);
171 
172 static irqreturn_t q6v5_handover_interrupt(int irq, void *data)
173 {
174 	struct qcom_q6v5 *q6v5 = data;
175 
176 	if (q6v5->handover)
177 		q6v5->handover(q6v5);
178 
179 	icc_set_bw(q6v5->path, 0, 0);
180 
181 	q6v5->handover_issued = true;
182 
183 	return IRQ_HANDLED;
184 }
185 
186 static irqreturn_t q6v5_stop_interrupt(int irq, void *data)
187 {
188 	struct qcom_q6v5 *q6v5 = data;
189 
190 	complete(&q6v5->stop_done);
191 
192 	return IRQ_HANDLED;
193 }
194 
195 /**
196  * qcom_q6v5_request_stop() - request the remote processor to stop
197  * @q6v5:	reference to qcom_q6v5 context
198  * @sysmon:	reference to the remote's sysmon instance, or NULL
199  *
200  * Return: 0 on success, negative errno on failure
201  */
202 int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5, struct qcom_sysmon *sysmon)
203 {
204 	int ret;
205 
206 	q6v5->running = false;
207 
208 	/* Don't perform SMP2P dance if sysmon already shut down the remote */
209 	if (qcom_sysmon_shutdown_acked(sysmon))
210 		return 0;
211 
212 	qcom_smem_state_update_bits(q6v5->state,
213 				    BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
214 
215 	ret = wait_for_completion_timeout(&q6v5->stop_done, 5 * HZ);
216 
217 	qcom_smem_state_update_bits(q6v5->state, BIT(q6v5->stop_bit), 0);
218 
219 	return ret == 0 ? -ETIMEDOUT : 0;
220 }
221 EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop);
222 
223 /**
224  * qcom_q6v5_panic() - panic handler to invoke a stop on the remote
225  * @q6v5:	reference to qcom_q6v5 context
226  *
227  * Set the stop bit and sleep in order to allow the remote processor to flush
228  * its caches etc for post mortem debugging.
229  *
230  * Return: 200ms
231  */
232 unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5)
233 {
234 	qcom_smem_state_update_bits(q6v5->state,
235 				    BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
236 
237 	return Q6V5_PANIC_DELAY_MS;
238 }
239 EXPORT_SYMBOL_GPL(qcom_q6v5_panic);
240 
241 /**
242  * qcom_q6v5_init() - initializer of the q6v5 common struct
243  * @q6v5:	handle to be initialized
244  * @pdev:	platform_device reference for acquiring resources
245  * @rproc:	associated remoteproc instance
246  * @crash_reason: SMEM id for crash reason string, or 0 if none
247  * @load_state: load state resource string
248  * @handover:	function to be called when proxy resources should be released
249  *
250  * Return: 0 on success, negative errno on failure
251  */
252 int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
253 		   struct rproc *rproc, int crash_reason, const char *load_state,
254 		   void (*handover)(struct qcom_q6v5 *q6v5))
255 {
256 	int ret;
257 
258 	q6v5->rproc = rproc;
259 	q6v5->dev = &pdev->dev;
260 	q6v5->crash_reason = crash_reason;
261 	q6v5->handover = handover;
262 
263 	init_completion(&q6v5->start_done);
264 	init_completion(&q6v5->stop_done);
265 
266 	q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog");
267 	if (q6v5->wdog_irq < 0)
268 		return q6v5->wdog_irq;
269 
270 	ret = devm_request_threaded_irq(&pdev->dev, q6v5->wdog_irq,
271 					NULL, q6v5_wdog_interrupt,
272 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
273 					"q6v5 wdog", q6v5);
274 	if (ret) {
275 		dev_err(&pdev->dev, "failed to acquire wdog IRQ\n");
276 		return ret;
277 	}
278 
279 	q6v5->fatal_irq = platform_get_irq_byname(pdev, "fatal");
280 	if (q6v5->fatal_irq < 0)
281 		return q6v5->fatal_irq;
282 
283 	ret = devm_request_threaded_irq(&pdev->dev, q6v5->fatal_irq,
284 					NULL, q6v5_fatal_interrupt,
285 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
286 					"q6v5 fatal", q6v5);
287 	if (ret) {
288 		dev_err(&pdev->dev, "failed to acquire fatal IRQ\n");
289 		return ret;
290 	}
291 
292 	q6v5->ready_irq = platform_get_irq_byname(pdev, "ready");
293 	if (q6v5->ready_irq < 0)
294 		return q6v5->ready_irq;
295 
296 	ret = devm_request_threaded_irq(&pdev->dev, q6v5->ready_irq,
297 					NULL, q6v5_ready_interrupt,
298 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
299 					"q6v5 ready", q6v5);
300 	if (ret) {
301 		dev_err(&pdev->dev, "failed to acquire ready IRQ\n");
302 		return ret;
303 	}
304 
305 	q6v5->handover_irq = platform_get_irq_byname(pdev, "handover");
306 	if (q6v5->handover_irq < 0)
307 		return q6v5->handover_irq;
308 
309 	ret = devm_request_threaded_irq(&pdev->dev, q6v5->handover_irq,
310 					NULL, q6v5_handover_interrupt,
311 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
312 					"q6v5 handover", q6v5);
313 	if (ret) {
314 		dev_err(&pdev->dev, "failed to acquire handover IRQ\n");
315 		return ret;
316 	}
317 	disable_irq(q6v5->handover_irq);
318 
319 	q6v5->stop_irq = platform_get_irq_byname(pdev, "stop-ack");
320 	if (q6v5->stop_irq < 0)
321 		return q6v5->stop_irq;
322 
323 	ret = devm_request_threaded_irq(&pdev->dev, q6v5->stop_irq,
324 					NULL, q6v5_stop_interrupt,
325 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
326 					"q6v5 stop", q6v5);
327 	if (ret) {
328 		dev_err(&pdev->dev, "failed to acquire stop-ack IRQ\n");
329 		return ret;
330 	}
331 
332 	q6v5->state = devm_qcom_smem_state_get(&pdev->dev, "stop", &q6v5->stop_bit);
333 	if (IS_ERR(q6v5->state)) {
334 		dev_err(&pdev->dev, "failed to acquire stop state\n");
335 		return PTR_ERR(q6v5->state);
336 	}
337 
338 	q6v5->load_state = devm_kstrdup_const(&pdev->dev, load_state, GFP_KERNEL);
339 	q6v5->qmp = qmp_get(&pdev->dev);
340 	if (IS_ERR(q6v5->qmp)) {
341 		if (PTR_ERR(q6v5->qmp) != -ENODEV)
342 			return dev_err_probe(&pdev->dev, PTR_ERR(q6v5->qmp),
343 					     "failed to acquire load state\n");
344 		q6v5->qmp = NULL;
345 	} else if (!q6v5->load_state) {
346 		if (!load_state)
347 			dev_err(&pdev->dev, "load state resource string empty\n");
348 
349 		qmp_put(q6v5->qmp);
350 		return load_state ? -ENOMEM : -EINVAL;
351 	}
352 
353 	q6v5->path = devm_of_icc_get(&pdev->dev, NULL);
354 	if (IS_ERR(q6v5->path))
355 		return dev_err_probe(&pdev->dev, PTR_ERR(q6v5->path),
356 				     "failed to acquire interconnect path\n");
357 
358 	return 0;
359 }
360 EXPORT_SYMBOL_GPL(qcom_q6v5_init);
361 
362 /**
363  * qcom_q6v5_deinit() - deinitialize the q6v5 common struct
364  * @q6v5:	reference to qcom_q6v5 context to be deinitialized
365  */
366 void qcom_q6v5_deinit(struct qcom_q6v5 *q6v5)
367 {
368 	qmp_put(q6v5->qmp);
369 }
370 EXPORT_SYMBOL_GPL(qcom_q6v5_deinit);
371 
372 MODULE_LICENSE("GPL v2");
373 MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Q6V5");
374