qcom_q6v5.c 7.3 KB

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