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/interrupt.h>
12 #include <linux/module.h>
13 #include <linux/soc/qcom/smem.h>
14 #include <linux/soc/qcom/smem_state.h>
15 #include <linux/remoteproc.h>
16 #include "qcom_q6v5.h"
17
18 #define Q6V5_PANIC_DELAY_MS 200
19
20 /**
21 * qcom_q6v5_prepare() - reinitialize the qcom_q6v5 context before start
22 * @q6v5: reference to qcom_q6v5 context to be reinitialized
23 *
24 * Return: 0 on success, negative errno on failure
25 */
qcom_q6v5_prepare(struct qcom_q6v5 * q6v5)26 int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5)
27 {
28 reinit_completion(&q6v5->start_done);
29 reinit_completion(&q6v5->stop_done);
30
31 q6v5->running = true;
32 q6v5->handover_issued = false;
33
34 enable_irq(q6v5->handover_irq);
35
36 return 0;
37 }
38 EXPORT_SYMBOL_GPL(qcom_q6v5_prepare);
39
40 /**
41 * qcom_q6v5_unprepare() - unprepare the qcom_q6v5 context after stop
42 * @q6v5: reference to qcom_q6v5 context to be unprepared
43 *
44 * Return: 0 on success, 1 if handover hasn't yet been called
45 */
qcom_q6v5_unprepare(struct qcom_q6v5 * q6v5)46 int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5)
47 {
48 disable_irq(q6v5->handover_irq);
49
50 return !q6v5->handover_issued;
51 }
52 EXPORT_SYMBOL_GPL(qcom_q6v5_unprepare);
53
q6v5_wdog_interrupt(int irq,void * data)54 static irqreturn_t q6v5_wdog_interrupt(int irq, void *data)
55 {
56 struct qcom_q6v5 *q6v5 = data;
57 size_t len;
58 char *msg;
59
60 /* Sometimes the stop triggers a watchdog rather than a stop-ack */
61 if (!q6v5->running) {
62 complete(&q6v5->stop_done);
63 return IRQ_HANDLED;
64 }
65
66 msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
67 if (!IS_ERR(msg) && len > 0 && msg[0])
68 dev_err(q6v5->dev, "watchdog received: %s\n", msg);
69 else
70 dev_err(q6v5->dev, "watchdog without message\n");
71
72 rproc_report_crash(q6v5->rproc, RPROC_WATCHDOG);
73
74 return IRQ_HANDLED;
75 }
76
q6v5_fatal_interrupt(int irq,void * data)77 static irqreturn_t q6v5_fatal_interrupt(int irq, void *data)
78 {
79 struct qcom_q6v5 *q6v5 = data;
80 size_t len;
81 char *msg;
82
83 msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
84 if (!IS_ERR(msg) && len > 0 && msg[0])
85 dev_err(q6v5->dev, "fatal error received: %s\n", msg);
86 else
87 dev_err(q6v5->dev, "fatal error without message\n");
88
89 q6v5->running = false;
90 rproc_report_crash(q6v5->rproc, RPROC_FATAL_ERROR);
91
92 return IRQ_HANDLED;
93 }
94
q6v5_ready_interrupt(int irq,void * data)95 static irqreturn_t q6v5_ready_interrupt(int irq, void *data)
96 {
97 struct qcom_q6v5 *q6v5 = data;
98
99 complete(&q6v5->start_done);
100
101 return IRQ_HANDLED;
102 }
103
104 /**
105 * qcom_q6v5_wait_for_start() - wait for remote processor start signal
106 * @q6v5: reference to qcom_q6v5 context
107 * @timeout: timeout to wait for the event, in jiffies
108 *
109 * qcom_q6v5_unprepare() should not be called when this function fails.
110 *
111 * Return: 0 on success, -ETIMEDOUT on timeout
112 */
qcom_q6v5_wait_for_start(struct qcom_q6v5 * q6v5,int timeout)113 int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout)
114 {
115 int ret;
116
117 ret = wait_for_completion_timeout(&q6v5->start_done, timeout);
118 if (!ret)
119 disable_irq(q6v5->handover_irq);
120
121 return !ret ? -ETIMEDOUT : 0;
122 }
123 EXPORT_SYMBOL_GPL(qcom_q6v5_wait_for_start);
124
q6v5_handover_interrupt(int irq,void * data)125 static irqreturn_t q6v5_handover_interrupt(int irq, void *data)
126 {
127 struct qcom_q6v5 *q6v5 = data;
128
129 if (q6v5->handover)
130 q6v5->handover(q6v5);
131
132 q6v5->handover_issued = true;
133
134 return IRQ_HANDLED;
135 }
136
q6v5_stop_interrupt(int irq,void * data)137 static irqreturn_t q6v5_stop_interrupt(int irq, void *data)
138 {
139 struct qcom_q6v5 *q6v5 = data;
140
141 complete(&q6v5->stop_done);
142
143 return IRQ_HANDLED;
144 }
145
146 /**
147 * qcom_q6v5_request_stop() - request the remote processor to stop
148 * @q6v5: reference to qcom_q6v5 context
149 *
150 * Return: 0 on success, negative errno on failure
151 */
qcom_q6v5_request_stop(struct qcom_q6v5 * q6v5)152 int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5)
153 {
154 int ret;
155
156 q6v5->running = false;
157
158 qcom_smem_state_update_bits(q6v5->state,
159 BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
160
161 ret = wait_for_completion_timeout(&q6v5->stop_done, 5 * HZ);
162
163 qcom_smem_state_update_bits(q6v5->state, BIT(q6v5->stop_bit), 0);
164
165 return ret == 0 ? -ETIMEDOUT : 0;
166 }
167 EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop);
168
169 /**
170 * qcom_q6v5_panic() - panic handler to invoke a stop on the remote
171 * @q6v5: reference to qcom_q6v5 context
172 *
173 * Set the stop bit and sleep in order to allow the remote processor to flush
174 * its caches etc for post mortem debugging.
175 *
176 * Return: 200ms
177 */
qcom_q6v5_panic(struct qcom_q6v5 * q6v5)178 unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5)
179 {
180 qcom_smem_state_update_bits(q6v5->state,
181 BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
182
183 return Q6V5_PANIC_DELAY_MS;
184 }
185 EXPORT_SYMBOL_GPL(qcom_q6v5_panic);
186
187 /**
188 * qcom_q6v5_init() - initializer of the q6v5 common struct
189 * @q6v5: handle to be initialized
190 * @pdev: platform_device reference for acquiring resources
191 * @rproc: associated remoteproc instance
192 * @crash_reason: SMEM id for crash reason string, or 0 if none
193 * @handover: function to be called when proxy resources should be released
194 *
195 * Return: 0 on success, negative errno on failure
196 */
qcom_q6v5_init(struct qcom_q6v5 * q6v5,struct platform_device * pdev,struct rproc * rproc,int crash_reason,void (* handover)(struct qcom_q6v5 * q6v5))197 int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
198 struct rproc *rproc, int crash_reason,
199 void (*handover)(struct qcom_q6v5 *q6v5))
200 {
201 int ret;
202
203 q6v5->rproc = rproc;
204 q6v5->dev = &pdev->dev;
205 q6v5->crash_reason = crash_reason;
206 q6v5->handover = handover;
207
208 init_completion(&q6v5->start_done);
209 init_completion(&q6v5->stop_done);
210
211 q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog");
212 if (q6v5->wdog_irq < 0)
213 return q6v5->wdog_irq;
214
215 ret = devm_request_threaded_irq(&pdev->dev, q6v5->wdog_irq,
216 NULL, q6v5_wdog_interrupt,
217 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
218 "q6v5 wdog", q6v5);
219 if (ret) {
220 dev_err(&pdev->dev, "failed to acquire wdog IRQ\n");
221 return ret;
222 }
223
224 q6v5->fatal_irq = platform_get_irq_byname(pdev, "fatal");
225 if (q6v5->fatal_irq < 0)
226 return q6v5->fatal_irq;
227
228 ret = devm_request_threaded_irq(&pdev->dev, q6v5->fatal_irq,
229 NULL, q6v5_fatal_interrupt,
230 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
231 "q6v5 fatal", q6v5);
232 if (ret) {
233 dev_err(&pdev->dev, "failed to acquire fatal IRQ\n");
234 return ret;
235 }
236
237 q6v5->ready_irq = platform_get_irq_byname(pdev, "ready");
238 if (q6v5->ready_irq < 0)
239 return q6v5->ready_irq;
240
241 ret = devm_request_threaded_irq(&pdev->dev, q6v5->ready_irq,
242 NULL, q6v5_ready_interrupt,
243 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
244 "q6v5 ready", q6v5);
245 if (ret) {
246 dev_err(&pdev->dev, "failed to acquire ready IRQ\n");
247 return ret;
248 }
249
250 q6v5->handover_irq = platform_get_irq_byname(pdev, "handover");
251 if (q6v5->handover_irq < 0)
252 return q6v5->handover_irq;
253
254 ret = devm_request_threaded_irq(&pdev->dev, q6v5->handover_irq,
255 NULL, q6v5_handover_interrupt,
256 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
257 "q6v5 handover", q6v5);
258 if (ret) {
259 dev_err(&pdev->dev, "failed to acquire handover IRQ\n");
260 return ret;
261 }
262 disable_irq(q6v5->handover_irq);
263
264 q6v5->stop_irq = platform_get_irq_byname(pdev, "stop-ack");
265 if (q6v5->stop_irq < 0)
266 return q6v5->stop_irq;
267
268 ret = devm_request_threaded_irq(&pdev->dev, q6v5->stop_irq,
269 NULL, q6v5_stop_interrupt,
270 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
271 "q6v5 stop", q6v5);
272 if (ret) {
273 dev_err(&pdev->dev, "failed to acquire stop-ack IRQ\n");
274 return ret;
275 }
276
277 q6v5->state = qcom_smem_state_get(&pdev->dev, "stop", &q6v5->stop_bit);
278 if (IS_ERR(q6v5->state)) {
279 dev_err(&pdev->dev, "failed to acquire stop state\n");
280 return PTR_ERR(q6v5->state);
281 }
282
283 return 0;
284 }
285 EXPORT_SYMBOL_GPL(qcom_q6v5_init);
286
287 MODULE_LICENSE("GPL v2");
288 MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Q6V5");
289
