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3b415c8f BA |
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> | |
ded79d06 | 12 | #include <linux/module.h> |
3b415c8f BA |
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 | /** | |
19 | * qcom_q6v5_prepare() - reinitialize the qcom_q6v5 context before start | |
20 | * @q6v5: reference to qcom_q6v5 context to be reinitialized | |
21 | * | |
22 | * Return: 0 on success, negative errno on failure | |
23 | */ | |
24 | int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5) | |
25 | { | |
26 | reinit_completion(&q6v5->start_done); | |
27 | reinit_completion(&q6v5->stop_done); | |
28 | ||
29 | q6v5->running = true; | |
30 | q6v5->handover_issued = false; | |
31 | ||
32 | enable_irq(q6v5->handover_irq); | |
33 | ||
34 | return 0; | |
35 | } | |
ded79d06 | 36 | EXPORT_SYMBOL_GPL(qcom_q6v5_prepare); |
3b415c8f BA |
37 | |
38 | /** | |
39 | * qcom_q6v5_unprepare() - unprepare the qcom_q6v5 context after stop | |
40 | * @q6v5: reference to qcom_q6v5 context to be unprepared | |
41 | * | |
42 | * Return: 0 on success, 1 if handover hasn't yet been called | |
43 | */ | |
44 | int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5) | |
45 | { | |
46 | disable_irq(q6v5->handover_irq); | |
47 | ||
48 | return !q6v5->handover_issued; | |
49 | } | |
ded79d06 | 50 | EXPORT_SYMBOL_GPL(qcom_q6v5_unprepare); |
3b415c8f BA |
51 | |
52 | static irqreturn_t q6v5_wdog_interrupt(int irq, void *data) | |
53 | { | |
54 | struct qcom_q6v5 *q6v5 = data; | |
55 | size_t len; | |
56 | char *msg; | |
57 | ||
58 | /* Sometimes the stop triggers a watchdog rather than a stop-ack */ | |
59 | if (!q6v5->running) { | |
60 | complete(&q6v5->stop_done); | |
61 | return IRQ_HANDLED; | |
62 | } | |
63 | ||
64 | msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len); | |
65 | if (!IS_ERR(msg) && len > 0 && msg[0]) | |
66 | dev_err(q6v5->dev, "watchdog received: %s\n", msg); | |
67 | else | |
68 | dev_err(q6v5->dev, "watchdog without message\n"); | |
69 | ||
70 | rproc_report_crash(q6v5->rproc, RPROC_WATCHDOG); | |
71 | ||
72 | return IRQ_HANDLED; | |
73 | } | |
74 | ||
75 | static irqreturn_t q6v5_fatal_interrupt(int irq, void *data) | |
76 | { | |
77 | struct qcom_q6v5 *q6v5 = data; | |
78 | size_t len; | |
79 | char *msg; | |
80 | ||
81 | msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len); | |
82 | if (!IS_ERR(msg) && len > 0 && msg[0]) | |
83 | dev_err(q6v5->dev, "fatal error received: %s\n", msg); | |
84 | else | |
85 | dev_err(q6v5->dev, "fatal error without message\n"); | |
86 | ||
d3ae96c0 | 87 | q6v5->running = false; |
3b415c8f BA |
88 | rproc_report_crash(q6v5->rproc, RPROC_FATAL_ERROR); |
89 | ||
90 | return IRQ_HANDLED; | |
91 | } | |
92 | ||
93 | static irqreturn_t q6v5_ready_interrupt(int irq, void *data) | |
94 | { | |
95 | struct qcom_q6v5 *q6v5 = data; | |
96 | ||
97 | complete(&q6v5->start_done); | |
98 | ||
99 | return IRQ_HANDLED; | |
100 | } | |
101 | ||
102 | /** | |
103 | * qcom_q6v5_wait_for_start() - wait for remote processor start signal | |
104 | * @q6v5: reference to qcom_q6v5 context | |
105 | * @timeout: timeout to wait for the event, in jiffies | |
106 | * | |
107 | * qcom_q6v5_unprepare() should not be called when this function fails. | |
108 | * | |
109 | * Return: 0 on success, -ETIMEDOUT on timeout | |
110 | */ | |
111 | int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout) | |
112 | { | |
113 | int ret; | |
114 | ||
115 | ret = wait_for_completion_timeout(&q6v5->start_done, timeout); | |
116 | if (!ret) | |
117 | disable_irq(q6v5->handover_irq); | |
118 | ||
119 | return !ret ? -ETIMEDOUT : 0; | |
120 | } | |
ded79d06 | 121 | EXPORT_SYMBOL_GPL(qcom_q6v5_wait_for_start); |
3b415c8f BA |
122 | |
123 | static irqreturn_t q6v5_handover_interrupt(int irq, void *data) | |
124 | { | |
125 | struct qcom_q6v5 *q6v5 = data; | |
126 | ||
127 | if (q6v5->handover) | |
128 | q6v5->handover(q6v5); | |
129 | ||
130 | q6v5->handover_issued = true; | |
131 | ||
132 | return IRQ_HANDLED; | |
133 | } | |
134 | ||
135 | static irqreturn_t q6v5_stop_interrupt(int irq, void *data) | |
136 | { | |
137 | struct qcom_q6v5 *q6v5 = data; | |
138 | ||
139 | complete(&q6v5->stop_done); | |
140 | ||
141 | return IRQ_HANDLED; | |
142 | } | |
143 | ||
144 | /** | |
145 | * qcom_q6v5_request_stop() - request the remote processor to stop | |
146 | * @q6v5: reference to qcom_q6v5 context | |
147 | * | |
148 | * Return: 0 on success, negative errno on failure | |
149 | */ | |
150 | int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5) | |
151 | { | |
152 | int ret; | |
153 | ||
3b415c8f BA |
154 | qcom_smem_state_update_bits(q6v5->state, |
155 | BIT(q6v5->stop_bit), BIT(q6v5->stop_bit)); | |
156 | ||
157 | ret = wait_for_completion_timeout(&q6v5->stop_done, 5 * HZ); | |
158 | ||
159 | qcom_smem_state_update_bits(q6v5->state, BIT(q6v5->stop_bit), 0); | |
160 | ||
161 | return ret == 0 ? -ETIMEDOUT : 0; | |
162 | } | |
ded79d06 | 163 | EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop); |
3b415c8f BA |
164 | |
165 | /** | |
166 | * qcom_q6v5_init() - initializer of the q6v5 common struct | |
167 | * @q6v5: handle to be initialized | |
168 | * @pdev: platform_device reference for acquiring resources | |
169 | * @rproc: associated remoteproc instance | |
170 | * @crash_reason: SMEM id for crash reason string, or 0 if none | |
171 | * @handover: function to be called when proxy resources should be released | |
172 | * | |
173 | * Return: 0 on success, negative errno on failure | |
174 | */ | |
175 | int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev, | |
176 | struct rproc *rproc, int crash_reason, | |
177 | void (*handover)(struct qcom_q6v5 *q6v5)) | |
178 | { | |
179 | int ret; | |
180 | ||
181 | q6v5->rproc = rproc; | |
182 | q6v5->dev = &pdev->dev; | |
183 | q6v5->crash_reason = crash_reason; | |
184 | q6v5->handover = handover; | |
185 | ||
186 | init_completion(&q6v5->start_done); | |
187 | init_completion(&q6v5->stop_done); | |
188 | ||
189 | q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog"); | |
1e2517d1 BN |
190 | if (q6v5->wdog_irq < 0) { |
191 | if (q6v5->wdog_irq != -EPROBE_DEFER) | |
192 | dev_err(&pdev->dev, | |
193 | "failed to retrieve wdog IRQ: %d\n", | |
194 | q6v5->wdog_irq); | |
195 | return q6v5->wdog_irq; | |
196 | } | |
197 | ||
3b415c8f BA |
198 | ret = devm_request_threaded_irq(&pdev->dev, q6v5->wdog_irq, |
199 | NULL, q6v5_wdog_interrupt, | |
200 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
201 | "q6v5 wdog", q6v5); | |
202 | if (ret) { | |
203 | dev_err(&pdev->dev, "failed to acquire wdog IRQ\n"); | |
204 | return ret; | |
205 | } | |
206 | ||
207 | q6v5->fatal_irq = platform_get_irq_byname(pdev, "fatal"); | |
1e2517d1 BN |
208 | if (q6v5->fatal_irq < 0) { |
209 | if (q6v5->fatal_irq != -EPROBE_DEFER) | |
210 | dev_err(&pdev->dev, | |
211 | "failed to retrieve fatal IRQ: %d\n", | |
212 | q6v5->fatal_irq); | |
213 | return q6v5->fatal_irq; | |
214 | } | |
d5269c45 | 215 | |
3b415c8f BA |
216 | ret = devm_request_threaded_irq(&pdev->dev, q6v5->fatal_irq, |
217 | NULL, q6v5_fatal_interrupt, | |
218 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
219 | "q6v5 fatal", q6v5); | |
220 | if (ret) { | |
221 | dev_err(&pdev->dev, "failed to acquire fatal IRQ\n"); | |
222 | return ret; | |
223 | } | |
224 | ||
225 | q6v5->ready_irq = platform_get_irq_byname(pdev, "ready"); | |
1e2517d1 BN |
226 | if (q6v5->ready_irq < 0) { |
227 | if (q6v5->ready_irq != -EPROBE_DEFER) | |
228 | dev_err(&pdev->dev, | |
229 | "failed to retrieve ready IRQ: %d\n", | |
230 | q6v5->ready_irq); | |
231 | return q6v5->ready_irq; | |
232 | } | |
d5269c45 | 233 | |
3b415c8f BA |
234 | ret = devm_request_threaded_irq(&pdev->dev, q6v5->ready_irq, |
235 | NULL, q6v5_ready_interrupt, | |
236 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
237 | "q6v5 ready", q6v5); | |
238 | if (ret) { | |
239 | dev_err(&pdev->dev, "failed to acquire ready IRQ\n"); | |
240 | return ret; | |
241 | } | |
242 | ||
243 | q6v5->handover_irq = platform_get_irq_byname(pdev, "handover"); | |
1e2517d1 BN |
244 | if (q6v5->handover_irq < 0) { |
245 | if (q6v5->handover_irq != -EPROBE_DEFER) | |
246 | dev_err(&pdev->dev, | |
247 | "failed to retrieve handover IRQ: %d\n", | |
248 | q6v5->handover_irq); | |
249 | return q6v5->handover_irq; | |
250 | } | |
d5269c45 | 251 | |
3b415c8f BA |
252 | ret = devm_request_threaded_irq(&pdev->dev, q6v5->handover_irq, |
253 | NULL, q6v5_handover_interrupt, | |
254 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
255 | "q6v5 handover", q6v5); | |
256 | if (ret) { | |
257 | dev_err(&pdev->dev, "failed to acquire handover IRQ\n"); | |
258 | return ret; | |
259 | } | |
260 | disable_irq(q6v5->handover_irq); | |
261 | ||
262 | q6v5->stop_irq = platform_get_irq_byname(pdev, "stop-ack"); | |
1e2517d1 BN |
263 | if (q6v5->stop_irq < 0) { |
264 | if (q6v5->stop_irq != -EPROBE_DEFER) | |
265 | dev_err(&pdev->dev, | |
266 | "failed to retrieve stop-ack IRQ: %d\n", | |
267 | q6v5->stop_irq); | |
268 | return q6v5->stop_irq; | |
269 | } | |
d5269c45 | 270 | |
3b415c8f BA |
271 | ret = devm_request_threaded_irq(&pdev->dev, q6v5->stop_irq, |
272 | NULL, q6v5_stop_interrupt, | |
273 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
274 | "q6v5 stop", q6v5); | |
275 | if (ret) { | |
276 | dev_err(&pdev->dev, "failed to acquire stop-ack IRQ\n"); | |
277 | return ret; | |
278 | } | |
279 | ||
280 | q6v5->state = qcom_smem_state_get(&pdev->dev, "stop", &q6v5->stop_bit); | |
281 | if (IS_ERR(q6v5->state)) { | |
282 | dev_err(&pdev->dev, "failed to acquire stop state\n"); | |
283 | return PTR_ERR(q6v5->state); | |
284 | } | |
285 | ||
286 | return 0; | |
287 | } | |
ded79d06 AB |
288 | EXPORT_SYMBOL_GPL(qcom_q6v5_init); |
289 | ||
290 | MODULE_LICENSE("GPL v2"); | |
291 | MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Q6V5"); |