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Diffstat (limited to '')
| -rw-r--r-- | drivers/remoteproc/qcom_q6v5.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/drivers/remoteproc/qcom_q6v5.c b/drivers/remoteproc/qcom_q6v5.c new file mode 100644 index 000000000..fd6fd3626 --- /dev/null +++ b/drivers/remoteproc/qcom_q6v5.c @@ -0,0 +1,288 @@ +// 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" + +#define Q6V5_PANIC_DELAY_MS 200 + +/** + * 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_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 + * @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"); |