Quelle  qcom_q6v5.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Qualcomm Peripheral Image Loader for Q6V5
 *
 * Copyright (C) 2016-2018 Linaro Ltd.
 * Copyright (C) 2014 Sony Mobile Communications AB
 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
 */
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/interconnect.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/soc/qcom/qcom_aoss.h>
#include <linux/soc/qcom/smem.h>
#include <linux/soc/qcom/smem_state.h>
#include <linux/remoteproc.h>
#include "qcom_common.h"
#include "qcom_q6v5.h"

#define Q6V5_LOAD_STATE_MSG_LEN 64
#define Q6V5_PANIC_DELAY_MS 200

static int q6v5_load_state_toggle(struct qcom_q6v5 *q6v5, bool enable)
{
 int ret;

 if (!q6v5->qmp)
  return 0;

 ret = qmp_send(q6v5->qmp, "{class: image, res: load_state, name: %s, val: %s}",
         q6v5->load_state, enable ? "on" : "off");
 if (ret)
  dev_err(q6v5->dev, "failed to toggle load state\n");

 return ret;
}

/**
 * qcom_q6v5_prepare() - reinitialize the qcom_q6v5 context before start
 * @q6v5: reference to qcom_q6v5 context to be reinitialized
 *
 * Return: 0 on success, negative errno on failure
 */
int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5)
{
 int ret;

 ret = icc_set_bw(q6v5->path, 0, UINT_MAX);
 if (ret < 0) {
  dev_err(q6v5->dev, "failed to set bandwidth request\n");
  return ret;
 }

 ret = q6v5_load_state_toggle(q6v5, true);
 if (ret) {
  icc_set_bw(q6v5->path, 0, 0);
  return ret;
 }

 reinit_completion(&q6v5->start_done);
 reinit_completion(&q6v5->stop_done);

 q6v5->running = true;
 q6v5->handover_issued = false;

 enable_irq(q6v5->handover_irq);

 return 0;
}
EXPORT_SYMBOL_GPL(qcom_q6v5_prepare);

/**
 * qcom_q6v5_unprepare() - unprepare the qcom_q6v5 context after stop
 * @q6v5: reference to qcom_q6v5 context to be unprepared
 *
 * Return: 0 on success, 1 if handover hasn't yet been called
 */
int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5)
{
 disable_irq(q6v5->handover_irq);
 q6v5_load_state_toggle(q6v5, false);

 /* Disable interconnect vote, in case handover never happened */
 icc_set_bw(q6v5->path, 0, 0);

 return !q6v5->handover_issued;
}
EXPORT_SYMBOL_GPL(qcom_q6v5_unprepare);

static irqreturn_t q6v5_wdog_interrupt(int irq, void *data)
{
 struct qcom_q6v5 *q6v5 = data;
 size_t len;
 char *msg;

 /* Sometimes the stop triggers a watchdog rather than a stop-ack */
 if (!q6v5->running) {
  complete(&q6v5->stop_done);
  return IRQ_HANDLED;
 }

 msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
 if (!IS_ERR(msg) && len > 0 && msg[0])
  dev_err(q6v5->dev, "watchdog received: %s\n", msg);
 else
  dev_err(q6v5->dev, "watchdog without message\n");

 q6v5->running = false;
 rproc_report_crash(q6v5->rproc, RPROC_WATCHDOG);

 return IRQ_HANDLED;
}

static irqreturn_t q6v5_fatal_interrupt(int irq, void *data)
{
 struct qcom_q6v5 *q6v5 = data;
 size_t len;
 char *msg;

 if (!q6v5->running)
  return IRQ_HANDLED;

 msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
 if (!IS_ERR(msg) && len > 0 && msg[0])
  dev_err(q6v5->dev, "fatal error received: %s\n", msg);
 else
  dev_err(q6v5->dev, "fatal error without message\n");

 q6v5->running = false;
 rproc_report_crash(q6v5->rproc, RPROC_FATAL_ERROR);

 return IRQ_HANDLED;
}

static irqreturn_t q6v5_ready_interrupt(int irq, void *data)
{
 struct qcom_q6v5 *q6v5 = data;

 complete(&q6v5->start_done);

 return IRQ_HANDLED;
}

/**
 * qcom_q6v5_wait_for_start() - wait for remote processor start signal
 * @q6v5: reference to qcom_q6v5 context
 * @timeout: timeout to wait for the event, in jiffies
 *
 * qcom_q6v5_unprepare() should not be called when this function fails.
 *
 * Return: 0 on success, -ETIMEDOUT on timeout
 */
int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout)
{
 int ret;

 ret = wait_for_completion_timeout(&q6v5->start_done, timeout);
 return !ret ? -ETIMEDOUT : 0;
}
EXPORT_SYMBOL_GPL(qcom_q6v5_wait_for_start);

static irqreturn_t q6v5_handover_interrupt(int irq, void *data)
{
 struct qcom_q6v5 *q6v5 = data;

 if (q6v5->handover_issued) {
  dev_err(q6v5->dev, "Handover signaled, but it already happened\n");
  return IRQ_HANDLED;
 }

 if (q6v5->handover)
  q6v5->handover(q6v5);

 icc_set_bw(q6v5->path, 0, 0);

 q6v5->handover_issued = true;

 return IRQ_HANDLED;
}

static irqreturn_t q6v5_stop_interrupt(int irq, void *data)
{
 struct qcom_q6v5 *q6v5 = data;

 complete(&q6v5->stop_done);

 return IRQ_HANDLED;
}

/**
 * qcom_q6v5_request_stop() - request the remote processor to stop
 * @q6v5: reference to qcom_q6v5 context
 * @sysmon: reference to the remote's sysmon instance, or NULL
 *
 * Return: 0 on success, negative errno on failure
 */
int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5, struct qcom_sysmon *sysmon)
{
 int ret;

 q6v5->running = false;

 /* Don't perform SMP2P dance if remote isn't running */
 if (q6v5->rproc->state != RPROC_RUNNING || qcom_sysmon_shutdown_acked(sysmon))
  return 0;

 qcom_smem_state_update_bits(q6v5->state,
        BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));

 ret = wait_for_completion_timeout(&q6v5->stop_done, 5 * HZ);

 qcom_smem_state_update_bits(q6v5->state, BIT(q6v5->stop_bit), 0);

 return ret == 0 ? -ETIMEDOUT : 0;
}
EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop);

/**
 * qcom_q6v5_panic() - panic handler to invoke a stop on the remote
 * @q6v5: reference to qcom_q6v5 context
 *
 * Set the stop bit and sleep in order to allow the remote processor to flush
 * its caches etc for post mortem debugging.
 *
 * Return: 200ms
 */
unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5)
{
 qcom_smem_state_update_bits(q6v5->state,
        BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));

 return Q6V5_PANIC_DELAY_MS;
}
EXPORT_SYMBOL_GPL(qcom_q6v5_panic);

/**
 * qcom_q6v5_init() - initializer of the q6v5 common struct
 * @q6v5: handle to be initialized
 * @pdev: platform_device reference for acquiring resources
 * @rproc: associated remoteproc instance
 * @crash_reason: SMEM id for crash reason string, or 0 if none
 * @load_state: load state resource string
 * @handover: function to be called when proxy resources should be released
 *
 * Return: 0 on success, negative errno on failure
 */
int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
     struct rproc *rproc, int crash_reason, const char *load_state,
     void (*handover)(struct qcom_q6v5 *q6v5))
{
 int ret;

 q6v5->rproc = rproc;
 q6v5->dev = &pdev->dev;
 q6v5->crash_reason = crash_reason;
 q6v5->handover = handover;

 init_completion(&q6v5->start_done);
 init_completion(&q6v5->stop_done);

 q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog");
 if (q6v5->wdog_irq < 0)
  return q6v5->wdog_irq;

 ret = devm_request_threaded_irq(&pdev->dev, q6v5->wdog_irq,
     NULL, q6v5_wdog_interrupt,
     IRQF_TRIGGER_RISING | IRQF_ONESHOT,
     "q6v5 wdog", q6v5);
 if (ret) {
  dev_err(&pdev->dev, "failed to acquire wdog IRQ\n");
  return ret;
 }

 q6v5->fatal_irq = platform_get_irq_byname(pdev, "fatal");
 if (q6v5->fatal_irq < 0)
  return q6v5->fatal_irq;

 ret = devm_request_threaded_irq(&pdev->dev, q6v5->fatal_irq,
     NULL, q6v5_fatal_interrupt,
     IRQF_TRIGGER_RISING | IRQF_ONESHOT,
     "q6v5 fatal", q6v5);
 if (ret) {
  dev_err(&pdev->dev, "failed to acquire fatal IRQ\n");
  return ret;
 }

 q6v5->ready_irq = platform_get_irq_byname(pdev, "ready");
 if (q6v5->ready_irq < 0)
  return q6v5->ready_irq;

 ret = devm_request_threaded_irq(&pdev->dev, q6v5->ready_irq,
     NULL, q6v5_ready_interrupt,
     IRQF_TRIGGER_RISING | IRQF_ONESHOT,
     "q6v5 ready", q6v5);
 if (ret) {
  dev_err(&pdev->dev, "failed to acquire ready IRQ\n");
  return ret;
 }

 q6v5->handover_irq = platform_get_irq_byname(pdev, "handover");
 if (q6v5->handover_irq < 0)
  return q6v5->handover_irq;

 ret = devm_request_threaded_irq(&pdev->dev, q6v5->handover_irq,
     NULL, q6v5_handover_interrupt,
     IRQF_TRIGGER_RISING | IRQF_ONESHOT,
     "q6v5 handover", q6v5);
 if (ret) {
  dev_err(&pdev->dev, "failed to acquire handover IRQ\n");
  return ret;
 }
 disable_irq(q6v5->handover_irq);

 q6v5->stop_irq = platform_get_irq_byname(pdev, "stop-ack");
 if (q6v5->stop_irq < 0)
  return q6v5->stop_irq;

 ret = devm_request_threaded_irq(&pdev->dev, q6v5->stop_irq,
     NULL, q6v5_stop_interrupt,
     IRQF_TRIGGER_RISING | IRQF_ONESHOT,
     "q6v5 stop", q6v5);
 if (ret) {
  dev_err(&pdev->dev, "failed to acquire stop-ack IRQ\n");
  return ret;
 }

 q6v5->state = devm_qcom_smem_state_get(&pdev->dev, "stop", &q6v5->stop_bit);
 if (IS_ERR(q6v5->state)) {
  dev_err(&pdev->dev, "failed to acquire stop state\n");
  return PTR_ERR(q6v5->state);
 }

 q6v5->load_state = devm_kstrdup_const(&pdev->dev, load_state, GFP_KERNEL);
 q6v5->qmp = qmp_get(&pdev->dev);
 if (IS_ERR(q6v5->qmp)) {
  if (PTR_ERR(q6v5->qmp) != -ENODEV)
   return dev_err_probe(&pdev->dev, PTR_ERR(q6v5->qmp),
          "failed to acquire load state\n");
  q6v5->qmp = NULL;
 } else if (!q6v5->load_state) {
  if (!load_state)
   dev_err(&pdev->dev, "load state resource string empty\n");

  qmp_put(q6v5->qmp);
  return load_state ? -ENOMEM : -EINVAL;
 }

 q6v5->path = devm_of_icc_get(&pdev->dev, NULL);
 if (IS_ERR(q6v5->path))
  return dev_err_probe(&pdev->dev, PTR_ERR(q6v5->path),
         "failed to acquire interconnect path\n");

 return 0;
}
EXPORT_SYMBOL_GPL(qcom_q6v5_init);

/**
 * qcom_q6v5_deinit() - deinitialize the q6v5 common struct
 * @q6v5: reference to qcom_q6v5 context to be deinitialized
 */
void qcom_q6v5_deinit(struct qcom_q6v5 *q6v5)
{
 qmp_put(q6v5->qmp);
}
EXPORT_SYMBOL_GPL(qcom_q6v5_deinit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Q6V5");