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- // 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/interrupt.h>
- #include <linux/module.h>
- #include <linux/soc/qcom/smem.h>
- #include <linux/soc/qcom/smem_state.h>
- #include <linux/remoteproc.h>
- #include "qcom_q6v5.h"
- /**
- * 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)
- {
- 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);
- 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");
- 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;
- 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);
- if (!ret)
- disable_irq(q6v5->handover_irq);
- 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)
- q6v5->handover(q6v5);
- 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
- *
- * Return: 0 on success, negative errno on failure
- */
- int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5)
- {
- int ret;
- q6v5->running = false;
- 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_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
- * @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,
- 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 = 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);
- }
- return 0;
- }
- EXPORT_SYMBOL_GPL(qcom_q6v5_init);
- MODULE_LICENSE("GPL v2");
- MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Q6V5");
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