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 /**
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 */
qcom_q6v5_prepare(struct qcom_q6v5 * q6v5)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 }
36 EXPORT_SYMBOL_GPL(qcom_q6v5_prepare);
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 */
qcom_q6v5_unprepare(struct qcom_q6v5 * q6v5)44 int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5)
45 {
46 disable_irq(q6v5->handover_irq);
47
48 return !q6v5->handover_issued;
49 }
50 EXPORT_SYMBOL_GPL(qcom_q6v5_unprepare);
51
q6v5_wdog_interrupt(int irq,void * data)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
q6v5_fatal_interrupt(int irq,void * data)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
87 q6v5->running = false;
88 rproc_report_crash(q6v5->rproc, RPROC_FATAL_ERROR);
89
90 return IRQ_HANDLED;
91 }
92
q6v5_ready_interrupt(int irq,void * data)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 */
qcom_q6v5_wait_for_start(struct qcom_q6v5 * q6v5,int timeout)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 }
121 EXPORT_SYMBOL_GPL(qcom_q6v5_wait_for_start);
122
q6v5_handover_interrupt(int irq,void * data)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
q6v5_stop_interrupt(int irq,void * data)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 */
qcom_q6v5_request_stop(struct qcom_q6v5 * q6v5)150 int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5)
151 {
152 int ret;
153
154 q6v5->running = false;
155
156 qcom_smem_state_update_bits(q6v5->state,
157 BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
158
159 ret = wait_for_completion_timeout(&q6v5->stop_done, 5 * HZ);
160
161 qcom_smem_state_update_bits(q6v5->state, BIT(q6v5->stop_bit), 0);
162
163 return ret == 0 ? -ETIMEDOUT : 0;
164 }
165 EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop);
166
167 /**
168 * qcom_q6v5_init() - initializer of the q6v5 common struct
169 * @q6v5: handle to be initialized
170 * @pdev: platform_device reference for acquiring resources
171 * @rproc: associated remoteproc instance
172 * @crash_reason: SMEM id for crash reason string, or 0 if none
173 * @handover: function to be called when proxy resources should be released
174 *
175 * Return: 0 on success, negative errno on failure
176 */
qcom_q6v5_init(struct qcom_q6v5 * q6v5,struct platform_device * pdev,struct rproc * rproc,int crash_reason,void (* handover)(struct qcom_q6v5 * q6v5))177 int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
178 struct rproc *rproc, int crash_reason,
179 void (*handover)(struct qcom_q6v5 *q6v5))
180 {
181 int ret;
182
183 q6v5->rproc = rproc;
184 q6v5->dev = &pdev->dev;
185 q6v5->crash_reason = crash_reason;
186 q6v5->handover = handover;
187
188 init_completion(&q6v5->start_done);
189 init_completion(&q6v5->stop_done);
190
191 q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog");
192 if (q6v5->wdog_irq < 0)
193 return q6v5->wdog_irq;
194
195 ret = devm_request_threaded_irq(&pdev->dev, q6v5->wdog_irq,
196 NULL, q6v5_wdog_interrupt,
197 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
198 "q6v5 wdog", q6v5);
199 if (ret) {
200 dev_err(&pdev->dev, "failed to acquire wdog IRQ\n");
201 return ret;
202 }
203
204 q6v5->fatal_irq = platform_get_irq_byname(pdev, "fatal");
205 if (q6v5->fatal_irq < 0)
206 return q6v5->fatal_irq;
207
208 ret = devm_request_threaded_irq(&pdev->dev, q6v5->fatal_irq,
209 NULL, q6v5_fatal_interrupt,
210 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
211 "q6v5 fatal", q6v5);
212 if (ret) {
213 dev_err(&pdev->dev, "failed to acquire fatal IRQ\n");
214 return ret;
215 }
216
217 q6v5->ready_irq = platform_get_irq_byname(pdev, "ready");
218 if (q6v5->ready_irq < 0)
219 return q6v5->ready_irq;
220
221 ret = devm_request_threaded_irq(&pdev->dev, q6v5->ready_irq,
222 NULL, q6v5_ready_interrupt,
223 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
224 "q6v5 ready", q6v5);
225 if (ret) {
226 dev_err(&pdev->dev, "failed to acquire ready IRQ\n");
227 return ret;
228 }
229
230 q6v5->handover_irq = platform_get_irq_byname(pdev, "handover");
231 if (q6v5->handover_irq < 0)
232 return q6v5->handover_irq;
233
234 ret = devm_request_threaded_irq(&pdev->dev, q6v5->handover_irq,
235 NULL, q6v5_handover_interrupt,
236 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
237 "q6v5 handover", q6v5);
238 if (ret) {
239 dev_err(&pdev->dev, "failed to acquire handover IRQ\n");
240 return ret;
241 }
242 disable_irq(q6v5->handover_irq);
243
244 q6v5->stop_irq = platform_get_irq_byname(pdev, "stop-ack");
245 if (q6v5->stop_irq < 0)
246 return q6v5->stop_irq;
247
248 ret = devm_request_threaded_irq(&pdev->dev, q6v5->stop_irq,
249 NULL, q6v5_stop_interrupt,
250 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
251 "q6v5 stop", q6v5);
252 if (ret) {
253 dev_err(&pdev->dev, "failed to acquire stop-ack IRQ\n");
254 return ret;
255 }
256
257 q6v5->state = qcom_smem_state_get(&pdev->dev, "stop", &q6v5->stop_bit);
258 if (IS_ERR(q6v5->state)) {
259 dev_err(&pdev->dev, "failed to acquire stop state\n");
260 return PTR_ERR(q6v5->state);
261 }
262
263 return 0;
264 }
265 EXPORT_SYMBOL_GPL(qcom_q6v5_init);
266
267 MODULE_LICENSE("GPL v2");
268 MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Q6V5");
269