--- /dev/null
+// 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/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;
+}
+
+/**
+ * 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;
+}
+
+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");
+
+ 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;
+}
+
+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;
+}
+
+/**
+ * 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");
+ 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");
+ 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");
+ 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");
+ 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");
+ 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;
+}
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