From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968021AbeCBQnq (ORCPT ); Fri, 2 Mar 2018 11:43:46 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:40964 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966619AbeCBQnh (ORCPT ); Fri, 2 Mar 2018 11:43:37 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 979F8607E5 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=ilina@codeaurora.org From: Lina Iyer To: andy.gross@linaro.org, david.brown@linaro.org, linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org Cc: rnayak@codeaurora.org, bjorn.andersson@linaro.org, linux-kernel@vger.kernel.org, Lina Iyer Subject: [PATCH v3 04/10] drivers: qcom: rpmh: add RPMH helper functions Date: Fri, 2 Mar 2018 09:43:11 -0700 Message-Id: <20180302164317.10554-5-ilina@codeaurora.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180302164317.10554-1-ilina@codeaurora.org> References: <20180302164317.10554-1-ilina@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- drivers/soc/qcom/Makefile | 4 +- drivers/soc/qcom/rpmh-internal.h | 2 + drivers/soc/qcom/rpmh-rsc.c | 7 ++ drivers/soc/qcom/rpmh.c | 257 +++++++++++++++++++++++++++++++++++++++ include/soc/qcom/rpmh.h | 34 ++++++ 5 files changed, 303 insertions(+), 1 deletion(-) create mode 100644 drivers/soc/qcom/rpmh.c create mode 100644 include/soc/qcom/rpmh.h diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile index bb013d56b5a1..5c9c6c442ea9 100644 --- a/drivers/soc/qcom/Makefile +++ b/drivers/soc/qcom/Makefile @@ -13,4 +13,6 @@ obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o obj-$(CONFIG_QCOM_SMP2P) += smp2p.o obj-$(CONFIG_QCOM_SMSM) += smsm.o obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o -obj-$(CONFIG_QCOM_RPMH) += rpmh-rsc.o +obj-$(CONFIG_QCOM_RPMH) += qcom_rpmh.o +qcom_rpmh-y += rpmh-rsc.o +qcom_rpmh-y += rpmh.o diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h index 12faec77c4f3..1442a64ac4c5 100644 --- a/drivers/soc/qcom/rpmh-internal.h +++ b/drivers/soc/qcom/rpmh-internal.h @@ -84,4 +84,6 @@ struct rsc_drv { int rpmh_rsc_send_data(struct rsc_drv *drv, struct tcs_request *msg); +void rpmh_tx_done(struct tcs_request *msg, int r); + #endif /* __RPM_INTERNAL_H__ */ diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c index 4322e23a2ba6..b5b39b86f904 100644 --- a/drivers/soc/qcom/rpmh-rsc.c +++ b/drivers/soc/qcom/rpmh-rsc.c @@ -263,6 +263,8 @@ static void tcs_notify_tx_done(unsigned long data) struct rsc_drv *drv = (struct rsc_drv *)data; struct tcs_response *resp; unsigned long flags; + struct tcs_request *msg; + int err; for (;;) { spin_lock_irqsave(&drv->drv_lock, flags); @@ -275,7 +277,10 @@ static void tcs_notify_tx_done(unsigned long data) list_del(&resp->list); spin_unlock_irqrestore(&drv->drv_lock, flags); trace_rpmh_notify_tx_done(drv, resp); + msg = resp->msg; + err = resp->err; free_response(resp); + rpmh_tx_done(msg, err); } } @@ -575,6 +580,8 @@ static int rpmh_rsc_probe(struct platform_device *pdev) write_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, 0, drv->tcs[ACTIVE_TCS].tcs_mask); + dev_set_drvdata(&pdev->dev, drv); + return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); } diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c new file mode 100644 index 000000000000..d95ea3fa8b67 --- /dev/null +++ b/drivers/soc/qcom/rpmh.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "rpmh-internal.h" + +#define RPMH_MAX_MBOXES 2 +#define RPMH_TIMEOUT (10 * HZ) + +#define DEFINE_RPMH_MSG_ONSTACK(rc, s, q, c, name) \ + struct rpmh_request name = { \ + .msg = { \ + .state = s, \ + .payload = name.cmd, \ + .num_payload = 0, \ + .is_complete = true, \ + }, \ + .cmd = { { 0 } }, \ + .completion = q, \ + .wait_count = c, \ + .rc = rc, \ + } + +/** + * rpmh_request: the message to be sent to rpmh-rsc + * + * @msg: the request + * @cmd: the payload that will be part of the @msg + * @completion: triggered when request is done + * @wait_count: count of waiters for this completion + * @err: err return from the controller + */ +struct rpmh_request { + struct tcs_request msg; + struct tcs_cmd cmd[MAX_RPMH_PAYLOAD]; + struct completion *completion; + atomic_t *wait_count; + struct rpmh_client *rc; + int err; +}; + +/** + * rpmh_ctrlr: our representation of the controller + * + * @drv: the controller instance + */ +struct rpmh_ctrlr { + struct rsc_drv *drv; +}; + +/** + * rpmh_client: the client object + * + * @dev: the platform device that is the owner + * @ctrlr: the controller associated with this client. + */ +struct rpmh_client { + struct device *dev; + struct rpmh_ctrlr *ctrlr; +}; + +static struct rpmh_ctrlr rpmh_rsc[RPMH_MAX_MBOXES]; +static DEFINE_MUTEX(rpmh_ctrlr_mutex); + +void rpmh_tx_done(struct tcs_request *msg, int r) +{ + struct rpmh_request *rpm_msg = container_of(msg, + struct rpmh_request, msg); + atomic_t *wc = rpm_msg->wait_count; + struct completion *compl = rpm_msg->completion; + + rpm_msg->err = r; + + if (r) + dev_err(rpm_msg->rc->dev, + "RPMH TX fail in msg addr 0x%x, err=%d\n", + rpm_msg->msg.payload[0].addr, r); + + /* Signal the blocking thread we are done */ + if (wc && atomic_dec_and_test(wc) && compl) + complete(compl); +} +EXPORT_SYMBOL(rpmh_tx_done); + +/** + * wait_for_tx_done: Wait until the response is received. + * + * @rc: The RPMH client + * @compl: The completion object + * @addr: An addr that we sent in that request + * @data: The data for the address in that request + * + */ +static int wait_for_tx_done(struct rpmh_client *rc, + struct completion *compl, u32 addr, u32 data) +{ + int ret; + + ret = wait_for_completion_timeout(compl, RPMH_TIMEOUT); + if (ret) + dev_dbg(rc->dev, + "RPMH response received addr=0x%x data=0x%x\n", + addr, data); + else + dev_err(rc->dev, + "RPMH response timeout addr=0x%x data=0x%x\n", + addr, data); + + return (ret > 0) ? 0 : -ETIMEDOUT; +} + +/** + * __rpmh_write: send the RPMH request + * + * @rc: The RPMH client + * @state: Active/Sleep request type + * @rpm_msg: The data that needs to be sent (payload). + */ +static int __rpmh_write(struct rpmh_client *rc, enum rpmh_state state, + struct rpmh_request *rpm_msg) +{ + int ret = -EFAULT; + + rpm_msg->msg.state = state; + + if (state == RPMH_ACTIVE_ONLY_STATE) { + WARN_ON(irqs_disabled()); + ret = rpmh_rsc_send_data(rc->ctrlr->drv, &rpm_msg->msg); + if (!ret) + dev_dbg(rc->dev, + "RPMH request sent addr=0x%x, data=0x%x\n", + rpm_msg->msg.payload[0].addr, + rpm_msg->msg.payload[0].data); + else + dev_warn(rc->dev, + "Error in RPMH request addr=0x%x, data=0x%x\n", + rpm_msg->msg.payload[0].addr, + rpm_msg->msg.payload[0].data); + } + + return ret; +} + +/** + * rpmh_write: Write a set of RPMH commands and block until response + * + * @rc: The RPMh handle got from rpmh_get_dev_channel + * @state: Active/sleep set + * @cmd: The payload data + * @n: The number of elements in payload + * + * May sleep. Do not call from atomic contexts. + */ +int rpmh_write(struct rpmh_client *rc, enum rpmh_state state, + struct tcs_cmd *cmd, int n) +{ + DECLARE_COMPLETION_ONSTACK(compl); + atomic_t wait_count = ATOMIC_INIT(1); + DEFINE_RPMH_MSG_ONSTACK(rc, state, &compl, &wait_count, rpm_msg); + int ret; + + if (IS_ERR_OR_NULL(rc) || !cmd || n <= 0 || n > MAX_RPMH_PAYLOAD) + return -EINVAL; + + might_sleep(); + + memcpy(rpm_msg.cmd, cmd, n * sizeof(*cmd)); + rpm_msg.msg.num_payload = n; + + ret = __rpmh_write(rc, state, &rpm_msg); + if (ret) + return ret; + + return wait_for_tx_done(rc, &compl, cmd[0].addr, cmd[0].data); +} +EXPORT_SYMBOL(rpmh_write); + +static struct rpmh_ctrlr *get_rpmh_ctrlr(struct platform_device *pdev) +{ + int i; + struct rsc_drv *drv = dev_get_drvdata(pdev->dev.parent); + struct rpmh_ctrlr *ctrlr = ERR_PTR(-EFAULT); + + if (!drv) + return ctrlr; + + mutex_lock(&rpmh_ctrlr_mutex); + for (i = 0; i < RPMH_MAX_MBOXES; i++) { + if (rpmh_rsc[i].drv == drv) { + ctrlr = &rpmh_rsc[i]; + goto unlock; + } + } + + for (i = 0; i < RPMH_MAX_MBOXES; i++) { + if (rpmh_rsc[i].drv == NULL) { + ctrlr = &rpmh_rsc[i]; + ctrlr->drv = drv; + break; + } + } + WARN_ON(i == RPMH_MAX_MBOXES); +unlock: + mutex_unlock(&rpmh_ctrlr_mutex); + return ctrlr; +} + +/** + * rpmh_get_client: Get the RPMh handle + * + * @pdev: the platform device which needs to communicate with RPM + * accelerators + * May sleep. + */ +struct rpmh_client *rpmh_get_client(struct platform_device *pdev) +{ + struct rpmh_client *rc; + + rc = kzalloc(sizeof(*rc), GFP_KERNEL); + if (!rc) + return ERR_PTR(-ENOMEM); + + rc->dev = &pdev->dev; + rc->ctrlr = get_rpmh_ctrlr(pdev); + if (IS_ERR(rc->ctrlr)) { + kfree(rc); + return ERR_PTR(-EFAULT); + } + + return rc; +} +EXPORT_SYMBOL(rpmh_get_client); + +/** + * rpmh_release: Release the RPMH client + * + * @rc: The RPMh handle to be freed. + */ +void rpmh_release(struct rpmh_client *rc) +{ + kfree(rc); +} +EXPORT_SYMBOL(rpmh_release); diff --git a/include/soc/qcom/rpmh.h b/include/soc/qcom/rpmh.h new file mode 100644 index 000000000000..53cc145990c2 --- /dev/null +++ b/include/soc/qcom/rpmh.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. + */ + +#ifndef __SOC_QCOM_RPMH_H__ +#define __SOC_QCOM_RPMH_H__ + +#include +#include + +struct rpmh_client; + +#if IS_ENABLED(CONFIG_QCOM_RPMH) +int rpmh_write(struct rpmh_client *rc, enum rpmh_state state, + struct tcs_cmd *cmd, int n); + +struct rpmh_client *rpmh_get_client(struct platform_device *pdev); + +void rpmh_release(struct rpmh_client *rc); + +#else + +static inline int rpmh_write(struct rpmh_client *rc, enum rpmh_state state, + struct tcs_cmd *cmd, int n) +{ return -ENODEV; } + +static inline struct rpmh_client *rpmh_get_client(struct platform_device *pdev) +{ return ERR_PTR(-ENODEV); } + +static inline void rpmh_release(struct rpmh_client *rc) { } +#endif /* CONFIG_QCOM_RPMH */ + +#endif /* __SOC_QCOM_RPMH_H__ */ -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project