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