drivers/remoteproc/qcom_q6v5.c

   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  */
  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  */
  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
  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
  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
  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  */
 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
 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
 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  */
 152 int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5)
 153 {
 154         int ret;
 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_panic() - panic handler to invoke a stop on the remote
 169  * @q6v5:       reference to qcom_q6v5 context
 170  *
 171  * Set the stop bit and sleep in order to allow the remote processor to flush
 172  * its caches etc for post mortem debugging.
 173  *
 174  * Return: 200ms
 175  */
 176 unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5)
 177 {
 178         qcom_smem_state_update_bits(q6v5->state,
 179                                     BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
 180
 181         return Q6V5_PANIC_DELAY_MS;
 182 }
 183 EXPORT_SYMBOL_GPL(qcom_q6v5_panic);
 184
 185 /**
 186  * qcom_q6v5_init() - initializer of the q6v5 common struct
 187  * @q6v5:       handle to be initialized
 188  * @pdev:       platform_device reference for acquiring resources
 189  * @rproc:      associated remoteproc instance
 190  * @crash_reason: SMEM id for crash reason string, or 0 if none
 191  * @handover:   function to be called when proxy resources should be released
 192  *
 193  * Return: 0 on success, negative errno on failure
 194  */
 195 int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
 196                    struct rproc *rproc, int crash_reason,
 197                    void (*handover)(struct qcom_q6v5 *q6v5))
 198 {
 199         int ret;
 200
 201         q6v5->rproc = rproc;
 202         q6v5->dev = &pdev->dev;
 203         q6v5->crash_reason = crash_reason;
 204         q6v5->handover = handover;
 205
 206         init_completion(&q6v5->start_done);
 207         init_completion(&q6v5->stop_done);
 208
 209         q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog");
 210         if (q6v5->wdog_irq < 0)
 211                 return q6v5->wdog_irq;
 212
 213         ret = devm_request_threaded_irq(&pdev->dev, q6v5->wdog_irq,
 214                                         NULL, q6v5_wdog_interrupt,
 215                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 216                                         "q6v5 wdog", q6v5);
 217         if (ret) {
 218                 dev_err(&pdev->dev, "failed to acquire wdog IRQ\n");
 219                 return ret;
 220         }
 221
 222         q6v5->fatal_irq = platform_get_irq_byname(pdev, "fatal");
 223         if (q6v5->fatal_irq < 0)
 224                 return q6v5->fatal_irq;
 225
 226         ret = devm_request_threaded_irq(&pdev->dev, q6v5->fatal_irq,
 227                                         NULL, q6v5_fatal_interrupt,
 228                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 229                                         "q6v5 fatal", q6v5);
 230         if (ret) {
 231                 dev_err(&pdev->dev, "failed to acquire fatal IRQ\n");
 232                 return ret;
 233         }
 234
 235         q6v5->ready_irq = platform_get_irq_byname(pdev, "ready");
 236         if (q6v5->ready_irq < 0)
 237                 return q6v5->ready_irq;
 238
 239         ret = devm_request_threaded_irq(&pdev->dev, q6v5->ready_irq,
 240                                         NULL, q6v5_ready_interrupt,
 241                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 242                                         "q6v5 ready", q6v5);
 243         if (ret) {
 244                 dev_err(&pdev->dev, "failed to acquire ready IRQ\n");
 245                 return ret;
 246         }
 247
 248         q6v5->handover_irq = platform_get_irq_byname(pdev, "handover");
 249         if (q6v5->handover_irq < 0)
 250                 return q6v5->handover_irq;
 251
 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");
 263         if (q6v5->stop_irq < 0)
 264                 return q6v5->stop_irq;
 265
 266         ret = devm_request_threaded_irq(&pdev->dev, q6v5->stop_irq,
 267                                         NULL, q6v5_stop_interrupt,
 268                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 269                                         "q6v5 stop", q6v5);
 270         if (ret) {
 271                 dev_err(&pdev->dev, "failed to acquire stop-ack IRQ\n");
 272                 return ret;
 273         }
 274
 275         q6v5->state = qcom_smem_state_get(&pdev->dev, "stop", &q6v5->stop_bit);
 276         if (IS_ERR(q6v5->state)) {
 277                 dev_err(&pdev->dev, "failed to acquire stop state\n");
 278                 return PTR_ERR(q6v5->state);
 279         }
 280
 281         return 0;
 282 }
 283 EXPORT_SYMBOL_GPL(qcom_q6v5_init);
 284
 285 MODULE_LICENSE("GPL v2");
 286 MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Q6V5");