// 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);
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);
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");
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