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drivers: qcom: rpmh: add RPMH helper functions
Sending RPMH requests and waiting for response from the controller through a callback is common functionality across all platform drivers. To simplify drivers, add a library functions to create RPMH client and send resource state requests. rpmh_write() is a synchronous blocking call that can be used to send active state requests. Signed-off-by: Lina Iyer <ilina@codeaurora.org> Signed-off-by: Raju P.L.S.S.S.N <rplsssn@codeaurora.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
parent
fc087fe5a4
commit
c1038456b0
5 changed files with 179 additions and 3 deletions
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@ -9,7 +9,9 @@ obj-$(CONFIG_QCOM_PM) += spm.o
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obj-$(CONFIG_QCOM_QMI_HELPERS) += qmi_helpers.o
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qmi_helpers-y += qmi_encdec.o qmi_interface.o
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obj-$(CONFIG_QCOM_RMTFS_MEM) += rmtfs_mem.o
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obj-$(CONFIG_QCOM_RPMH) += rpmh-rsc.o
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obj-$(CONFIG_QCOM_RPMH) += qcom_rpmh.o
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qcom_rpmh-y += rpmh-rsc.o
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qcom_rpmh-y += rpmh.o
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obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o
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obj-$(CONFIG_QCOM_SMEM) += smem.o
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obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
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@ -41,6 +41,32 @@ struct tcs_group {
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const struct tcs_request *req[MAX_TCS_PER_TYPE];
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};
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/**
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* struct rpmh_request: the message to be sent to rpmh-rsc
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*
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* @msg: the request
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* @cmd: the payload that will be part of the @msg
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* @completion: triggered when request is done
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* @dev: the device making the request
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* @err: err return from the controller
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*/
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struct rpmh_request {
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struct tcs_request msg;
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struct tcs_cmd cmd[MAX_RPMH_PAYLOAD];
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struct completion *completion;
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const struct device *dev;
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int err;
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};
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/**
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* struct rpmh_ctrlr: our representation of the controller
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*
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* @drv: the controller instance
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*/
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struct rpmh_ctrlr {
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struct rsc_drv *drv;
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};
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/**
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* struct rsc_drv: the Direct Resource Voter (DRV) of the
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* Resource State Coordinator controller (RSC)
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@ -52,6 +78,7 @@ struct tcs_group {
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* @tcs: TCS groups
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* @tcs_in_use: s/w state of the TCS
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* @lock: synchronize state of the controller
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* @client: handle to the DRV's client.
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*/
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struct rsc_drv {
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const char *name;
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@ -61,9 +88,11 @@ struct rsc_drv {
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struct tcs_group tcs[TCS_TYPE_NR];
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DECLARE_BITMAP(tcs_in_use, MAX_TCS_NR);
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spinlock_t lock;
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struct rpmh_ctrlr client;
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};
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int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg);
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void rpmh_tx_done(const struct tcs_request *msg, int r);
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#endif /* __RPM_INTERNAL_H__ */
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@ -138,7 +138,7 @@ static const struct tcs_request *get_req_from_tcs(struct rsc_drv *drv,
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static irqreturn_t tcs_tx_done(int irq, void *p)
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{
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struct rsc_drv *drv = p;
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int i, j, err;
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int i, j, err = 0;
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unsigned long irq_status;
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const struct tcs_request *req;
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struct tcs_cmd *cmd;
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@ -175,6 +175,8 @@ static irqreturn_t tcs_tx_done(int irq, void *p)
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spin_lock(&drv->lock);
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clear_bit(i, drv->tcs_in_use);
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spin_unlock(&drv->lock);
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if (req)
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rpmh_tx_done(req, err);
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}
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return IRQ_HANDLED;
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@ -467,6 +469,8 @@ static int rpmh_rsc_probe(struct platform_device *pdev)
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/* Enable the active TCS to send requests immediately */
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write_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, drv->tcs[ACTIVE_TCS].mask);
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dev_set_drvdata(&pdev->dev, drv);
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return devm_of_platform_populate(&pdev->dev);
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}
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116
drivers/soc/qcom/rpmh.c
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116
drivers/soc/qcom/rpmh.c
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@ -0,0 +1,116 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
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*/
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#include <linux/atomic.h>
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#include <linux/bug.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <soc/qcom/rpmh.h>
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#include "rpmh-internal.h"
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#define RPMH_TIMEOUT_MS msecs_to_jiffies(10000)
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#define DEFINE_RPMH_MSG_ONSTACK(dev, s, q, name) \
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struct rpmh_request name = { \
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.msg = { \
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.state = s, \
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.cmds = name.cmd, \
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.num_cmds = 0, \
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.wait_for_compl = true, \
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}, \
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.cmd = { { 0 } }, \
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.completion = q, \
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.dev = dev, \
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}
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#define ctrlr_to_drv(ctrlr) container_of(ctrlr, struct rsc_drv, client)
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static struct rpmh_ctrlr *get_rpmh_ctrlr(const struct device *dev)
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{
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struct rsc_drv *drv = dev_get_drvdata(dev->parent);
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return &drv->client;
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}
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void rpmh_tx_done(const struct tcs_request *msg, int r)
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{
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struct rpmh_request *rpm_msg = container_of(msg, struct rpmh_request,
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msg);
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struct completion *compl = rpm_msg->completion;
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rpm_msg->err = r;
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if (r)
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dev_err(rpm_msg->dev, "RPMH TX fail in msg addr=%#x, err=%d\n",
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rpm_msg->msg.cmds[0].addr, r);
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/* Signal the blocking thread we are done */
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if (compl)
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complete(compl);
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}
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/**
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* __rpmh_write: send the RPMH request
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*
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* @dev: The device making the request
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* @state: Active/Sleep request type
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* @rpm_msg: The data that needs to be sent (cmds).
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*/
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static int __rpmh_write(const struct device *dev, enum rpmh_state state,
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struct rpmh_request *rpm_msg)
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{
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struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);
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rpm_msg->msg.state = state;
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if (state != RPMH_ACTIVE_ONLY_STATE)
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return -EINVAL;
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WARN_ON(irqs_disabled());
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return rpmh_rsc_send_data(ctrlr_to_drv(ctrlr), &rpm_msg->msg);
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}
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/**
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* rpmh_write: Write a set of RPMH commands and block until response
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*
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* @rc: The RPMH handle got from rpmh_get_client
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* @state: Active/sleep set
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* @cmd: The payload data
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* @n: The number of elements in @cmd
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*
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* May sleep. Do not call from atomic contexts.
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*/
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int rpmh_write(const struct device *dev, enum rpmh_state state,
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const struct tcs_cmd *cmd, u32 n)
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{
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DECLARE_COMPLETION_ONSTACK(compl);
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DEFINE_RPMH_MSG_ONSTACK(dev, state, &compl, rpm_msg);
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int ret;
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if (!cmd || !n || n > MAX_RPMH_PAYLOAD)
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return -EINVAL;
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memcpy(rpm_msg.cmd, cmd, n * sizeof(*cmd));
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rpm_msg.msg.num_cmds = n;
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ret = __rpmh_write(dev, state, &rpm_msg);
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if (ret)
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return ret;
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ret = wait_for_completion_timeout(&compl, RPMH_TIMEOUT_MS);
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WARN_ON(!ret);
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return (ret > 0) ? 0 : -ETIMEDOUT;
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}
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EXPORT_SYMBOL(rpmh_write);
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25
include/soc/qcom/rpmh.h
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25
include/soc/qcom/rpmh.h
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@ -0,0 +1,25 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
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*/
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#ifndef __SOC_QCOM_RPMH_H__
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#define __SOC_QCOM_RPMH_H__
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#include <soc/qcom/tcs.h>
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#include <linux/platform_device.h>
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#if IS_ENABLED(CONFIG_QCOM_RPMH)
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int rpmh_write(const struct device *dev, enum rpmh_state state,
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const struct tcs_cmd *cmd, u32 n);
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#else
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static inline int rpmh_write(const struct device *dev, enum rpmh_state state,
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const struct tcs_cmd *cmd, u32 n)
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{ return -ENODEV; }
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#endif /* CONFIG_QCOM_RPMH */
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#endif /* __SOC_QCOM_RPMH_H__ */
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