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![Sibi Sankar](/assets/img/avatar_default.png)
The power domains exposed by the AOSS QMP driver control the load state resources linked to modem, adsp, cdsp remoteprocs. These are used to notify the Always on Subsystem (AOSS) that a particular co-processor is up/down. AOSS uses this information to wait for the co-processors to suspend before starting its sleep sequence. These co-processors enter low-power modes independent to that of the application processor and the load state resources linked to them are expected to remain unaltered across system suspend/resume cycles. To achieve this behavior lets stop using the power-domains exposed by the AOSS QMP node and replace them with generic qmp_send interface instead. Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> [bjorn: Fixed up build error in q6v5_wcss_remove()] Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/1631800770-371-5-git-send-email-sibis@codeaurora.org
349 lines
8.9 KiB
C
349 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Qualcomm Peripheral Image Loader for Q6V5
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*
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* Copyright (C) 2016-2018 Linaro Ltd.
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* Copyright (C) 2014 Sony Mobile Communications AB
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* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/soc/qcom/smem.h>
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#include <linux/soc/qcom/smem_state.h>
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#include <linux/remoteproc.h>
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#include "qcom_common.h"
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#include "qcom_q6v5.h"
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#define Q6V5_LOAD_STATE_MSG_LEN 64
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#define Q6V5_PANIC_DELAY_MS 200
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static int q6v5_load_state_toggle(struct qcom_q6v5 *q6v5, bool enable)
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{
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char buf[Q6V5_LOAD_STATE_MSG_LEN];
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int ret;
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if (!q6v5->qmp)
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return 0;
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ret = snprintf(buf, sizeof(buf),
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"{class: image, res: load_state, name: %s, val: %s}",
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q6v5->load_state, enable ? "on" : "off");
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WARN_ON(ret >= Q6V5_LOAD_STATE_MSG_LEN);
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ret = qmp_send(q6v5->qmp, buf, sizeof(buf));
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if (ret)
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dev_err(q6v5->dev, "failed to toggle load state\n");
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return ret;
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}
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/**
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* qcom_q6v5_prepare() - reinitialize the qcom_q6v5 context before start
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* @q6v5: reference to qcom_q6v5 context to be reinitialized
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*
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* Return: 0 on success, negative errno on failure
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*/
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int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5)
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{
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int ret;
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ret = q6v5_load_state_toggle(q6v5, true);
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if (ret)
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return ret;
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reinit_completion(&q6v5->start_done);
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reinit_completion(&q6v5->stop_done);
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q6v5->running = true;
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q6v5->handover_issued = false;
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enable_irq(q6v5->handover_irq);
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return 0;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_prepare);
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/**
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* qcom_q6v5_unprepare() - unprepare the qcom_q6v5 context after stop
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* @q6v5: reference to qcom_q6v5 context to be unprepared
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*
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* Return: 0 on success, 1 if handover hasn't yet been called
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*/
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int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5)
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{
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disable_irq(q6v5->handover_irq);
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q6v5_load_state_toggle(q6v5, false);
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return !q6v5->handover_issued;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_unprepare);
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static irqreturn_t q6v5_wdog_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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size_t len;
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char *msg;
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/* Sometimes the stop triggers a watchdog rather than a stop-ack */
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if (!q6v5->running) {
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complete(&q6v5->stop_done);
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return IRQ_HANDLED;
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}
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msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
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if (!IS_ERR(msg) && len > 0 && msg[0])
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dev_err(q6v5->dev, "watchdog received: %s\n", msg);
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else
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dev_err(q6v5->dev, "watchdog without message\n");
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rproc_report_crash(q6v5->rproc, RPROC_WATCHDOG);
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return IRQ_HANDLED;
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}
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static irqreturn_t q6v5_fatal_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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size_t len;
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char *msg;
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msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
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if (!IS_ERR(msg) && len > 0 && msg[0])
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dev_err(q6v5->dev, "fatal error received: %s\n", msg);
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else
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dev_err(q6v5->dev, "fatal error without message\n");
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q6v5->running = false;
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rproc_report_crash(q6v5->rproc, RPROC_FATAL_ERROR);
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return IRQ_HANDLED;
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}
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static irqreturn_t q6v5_ready_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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complete(&q6v5->start_done);
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return IRQ_HANDLED;
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}
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/**
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* qcom_q6v5_wait_for_start() - wait for remote processor start signal
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* @q6v5: reference to qcom_q6v5 context
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* @timeout: timeout to wait for the event, in jiffies
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*
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* qcom_q6v5_unprepare() should not be called when this function fails.
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*
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* Return: 0 on success, -ETIMEDOUT on timeout
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*/
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int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout)
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{
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int ret;
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ret = wait_for_completion_timeout(&q6v5->start_done, timeout);
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if (!ret)
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disable_irq(q6v5->handover_irq);
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return !ret ? -ETIMEDOUT : 0;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_wait_for_start);
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static irqreturn_t q6v5_handover_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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if (q6v5->handover)
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q6v5->handover(q6v5);
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q6v5->handover_issued = true;
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return IRQ_HANDLED;
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}
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static irqreturn_t q6v5_stop_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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complete(&q6v5->stop_done);
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return IRQ_HANDLED;
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}
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/**
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* qcom_q6v5_request_stop() - request the remote processor to stop
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* @q6v5: reference to qcom_q6v5 context
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* @sysmon: reference to the remote's sysmon instance, or NULL
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*
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* Return: 0 on success, negative errno on failure
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*/
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int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5, struct qcom_sysmon *sysmon)
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{
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int ret;
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q6v5->running = false;
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/* Don't perform SMP2P dance if sysmon already shut down the remote */
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if (qcom_sysmon_shutdown_acked(sysmon))
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return 0;
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qcom_smem_state_update_bits(q6v5->state,
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BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
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ret = wait_for_completion_timeout(&q6v5->stop_done, 5 * HZ);
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qcom_smem_state_update_bits(q6v5->state, BIT(q6v5->stop_bit), 0);
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return ret == 0 ? -ETIMEDOUT : 0;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop);
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/**
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* qcom_q6v5_panic() - panic handler to invoke a stop on the remote
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* @q6v5: reference to qcom_q6v5 context
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*
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* Set the stop bit and sleep in order to allow the remote processor to flush
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* its caches etc for post mortem debugging.
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*
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* Return: 200ms
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*/
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unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5)
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{
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qcom_smem_state_update_bits(q6v5->state,
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BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
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return Q6V5_PANIC_DELAY_MS;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_panic);
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/**
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* qcom_q6v5_init() - initializer of the q6v5 common struct
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* @q6v5: handle to be initialized
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* @pdev: platform_device reference for acquiring resources
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* @rproc: associated remoteproc instance
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* @crash_reason: SMEM id for crash reason string, or 0 if none
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* @load_state: load state resource string
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* @handover: function to be called when proxy resources should be released
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*
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* Return: 0 on success, negative errno on failure
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*/
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int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
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struct rproc *rproc, int crash_reason, const char *load_state,
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void (*handover)(struct qcom_q6v5 *q6v5))
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{
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int ret;
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q6v5->rproc = rproc;
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q6v5->dev = &pdev->dev;
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q6v5->crash_reason = crash_reason;
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q6v5->handover = handover;
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init_completion(&q6v5->start_done);
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init_completion(&q6v5->stop_done);
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q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog");
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if (q6v5->wdog_irq < 0)
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return q6v5->wdog_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->wdog_irq,
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NULL, q6v5_wdog_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 wdog", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire wdog IRQ\n");
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return ret;
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}
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q6v5->fatal_irq = platform_get_irq_byname(pdev, "fatal");
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if (q6v5->fatal_irq < 0)
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return q6v5->fatal_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->fatal_irq,
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NULL, q6v5_fatal_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 fatal", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire fatal IRQ\n");
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return ret;
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}
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q6v5->ready_irq = platform_get_irq_byname(pdev, "ready");
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if (q6v5->ready_irq < 0)
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return q6v5->ready_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->ready_irq,
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NULL, q6v5_ready_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 ready", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire ready IRQ\n");
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return ret;
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}
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q6v5->handover_irq = platform_get_irq_byname(pdev, "handover");
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if (q6v5->handover_irq < 0)
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return q6v5->handover_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->handover_irq,
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NULL, q6v5_handover_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 handover", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire handover IRQ\n");
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return ret;
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}
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disable_irq(q6v5->handover_irq);
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q6v5->stop_irq = platform_get_irq_byname(pdev, "stop-ack");
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if (q6v5->stop_irq < 0)
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return q6v5->stop_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->stop_irq,
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NULL, q6v5_stop_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 stop", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire stop-ack IRQ\n");
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return ret;
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}
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q6v5->state = devm_qcom_smem_state_get(&pdev->dev, "stop", &q6v5->stop_bit);
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if (IS_ERR(q6v5->state)) {
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dev_err(&pdev->dev, "failed to acquire stop state\n");
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return PTR_ERR(q6v5->state);
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}
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q6v5->load_state = devm_kstrdup_const(&pdev->dev, load_state, GFP_KERNEL);
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q6v5->qmp = qmp_get(&pdev->dev);
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if (IS_ERR(q6v5->qmp)) {
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if (PTR_ERR(q6v5->qmp) != -ENODEV)
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return dev_err_probe(&pdev->dev, PTR_ERR(q6v5->qmp),
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"failed to acquire load state\n");
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q6v5->qmp = NULL;
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} else if (!q6v5->load_state) {
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if (!load_state)
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dev_err(&pdev->dev, "load state resource string empty\n");
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qmp_put(q6v5->qmp);
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return load_state ? -ENOMEM : -EINVAL;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_init);
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/**
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* qcom_q6v5_deinit() - deinitialize the q6v5 common struct
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* @q6v5: reference to qcom_q6v5 context to be deinitialized
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*/
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void qcom_q6v5_deinit(struct qcom_q6v5 *q6v5)
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{
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qmp_put(q6v5->qmp);
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_deinit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Q6V5");
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