From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lina Iyer Subject: [PATCH v8 04/10] drivers: qcom: rpmh: add RPMH helper functions Date: Wed, 9 May 2018 11:01:53 -0600 Message-ID: <20180509170159.29682-5-ilina@codeaurora.org> References: <20180509170159.29682-1-ilina@codeaurora.org> Return-path: In-Reply-To: <20180509170159.29682-1-ilina@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org 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, sboyd@kernel.org, evgreen@chromium.org, dianders@chromium.org, mka@chromium.org, rplsssn@codeaurora.org, Lina Iyer List-Id: linux-arm-msm@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 --- Changes in v7: - Optimization and locking fixes Changes in v6: - replace rpmh_client with device - inline wait_for_tx_done() Changes in v4: - use const struct tcs_cmd in API - remove wait count from this patch - changed -EFAULT to -EINVAL --- drivers/soc/qcom/Makefile | 4 +- drivers/soc/qcom/rpmh-internal.h | 6 ++ drivers/soc/qcom/rpmh-rsc.c | 8 ++ drivers/soc/qcom/rpmh.c | 176 +++++++++++++++++++++++++++++++ include/soc/qcom/rpmh.h | 25 +++++ 5 files changed, 218 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 cb6300f6a8e9..bb395c3202ca 100644 --- a/drivers/soc/qcom/Makefile +++ b/drivers/soc/qcom/Makefile @@ -7,7 +7,9 @@ obj-$(CONFIG_QCOM_PM) += spm.o obj-$(CONFIG_QCOM_QMI_HELPERS) += qmi_helpers.o qmi_helpers-y += qmi_encdec.o qmi_interface.o obj-$(CONFIG_QCOM_RMTFS_MEM) += rmtfs_mem.o -obj-$(CONFIG_QCOM_RPMH) += rpmh-rsc.o +obj-$(CONFIG_QCOM_RPMH) += qcom_rpmh.o +qcom_rpmh-y += rpmh-rsc.o +qcom_rpmh-y += rpmh.o obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o obj-$(CONFIG_QCOM_SMEM) += smem.o obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h index cc29176f1303..d9a21726e568 100644 --- a/drivers/soc/qcom/rpmh-internal.h +++ b/drivers/soc/qcom/rpmh-internal.h @@ -14,6 +14,7 @@ #define MAX_CMDS_PER_TCS 16 #define MAX_TCS_PER_TYPE 3 #define MAX_TCS_NR (MAX_TCS_PER_TYPE * TCS_TYPE_NR) +#define RPMH_MAX_CTRLR 2 struct rsc_drv; @@ -52,6 +53,7 @@ struct tcs_group { * @tcs: TCS groups * @tcs_in_use: s/w state of the TCS * @lock: synchronize state of the controller + * @list: element in list of drv */ struct rsc_drv { const char *name; @@ -61,9 +63,13 @@ struct rsc_drv { struct tcs_group tcs[TCS_TYPE_NR]; DECLARE_BITMAP(tcs_in_use, MAX_TCS_NR); spinlock_t lock; + struct list_head list; }; +extern struct list_head rsc_drv_list; int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg); +void rpmh_tx_done(const 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 0a8cec9d1651..c0edf3850147 100644 --- a/drivers/soc/qcom/rpmh-rsc.c +++ b/drivers/soc/qcom/rpmh-rsc.c @@ -61,6 +61,8 @@ #define CMD_STATUS_ISSUED BIT(8) #define CMD_STATUS_COMPL BIT(16) +LIST_HEAD(rsc_drv_list); + static u32 read_tcs_reg(struct rsc_drv *drv, int reg, int tcs_id, int cmd_id) { return readl_relaxed(drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id + @@ -176,6 +178,8 @@ static irqreturn_t tcs_tx_done(int irq, void *p) spin_lock(&drv->lock); clear_bit(i, drv->tcs_in_use); spin_unlock(&drv->lock); + if (req) + rpmh_tx_done(req, err); } return IRQ_HANDLED; @@ -469,6 +473,10 @@ static int rpmh_rsc_probe(struct platform_device *pdev) /* Enable the active TCS to send requests immediately */ write_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, drv->tcs[ACTIVE_TCS].mask); + INIT_LIST_HEAD(&drv->list); + list_add(&drv->list, &rsc_drv_list); + dev_set_drvdata(&pdev->dev, drv); + return devm_of_platform_populate(&pdev->dev); } diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c new file mode 100644 index 000000000000..74bb82339b01 --- /dev/null +++ b/drivers/soc/qcom/rpmh.c @@ -0,0 +1,176 @@ +// 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_TIMEOUT_MS msecs_to_jiffies(10000) + +#define DEFINE_RPMH_MSG_ONSTACK(dev, s, q, name) \ + struct rpmh_request name = { \ + .msg = { \ + .state = s, \ + .cmds = name.cmd, \ + .num_cmds = 0, \ + .wait_for_compl = true, \ + }, \ + .cmd = { { 0 } }, \ + .completion = q, \ + .dev = dev, \ + } + +/** + * struct 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 + * @dev: the device making the request + * @err: err return from the controller + */ +struct rpmh_request { + struct tcs_request msg; + struct tcs_cmd cmd[MAX_RPMH_PAYLOAD]; + struct completion *completion; + const struct device *dev; + int err; +}; + +/** + * struct rpmh_ctrlr: our representation of the controller + * + * @drv: the controller instance + */ +struct rpmh_ctrlr { + struct rsc_drv *drv; +}; + +static struct rpmh_ctrlr rpmh_rsc[RPMH_MAX_CTRLR]; +static DEFINE_SPINLOCK(rpmh_rsc_lock); + +static struct rpmh_ctrlr *get_rpmh_ctrlr(const struct device *dev) +{ + int i; + struct rsc_drv *p, *drv = dev_get_drvdata(dev->parent); + struct rpmh_ctrlr *ctrlr = ERR_PTR(-EINVAL); + unsigned long flags; + + if (!drv) + return ctrlr; + + for (i = 0; i < RPMH_MAX_CTRLR; i++) { + if (rpmh_rsc[i].drv == drv) { + ctrlr = &rpmh_rsc[i]; + return ctrlr; + } + } + + spin_lock_irqsave(&rpmh_rsc_lock, flags); + list_for_each_entry(p, &rsc_drv_list, list) { + if (drv == p) { + for (i = 0; i < RPMH_MAX_CTRLR; i++) { + if (!rpmh_rsc[i].drv) + break; + } + if (i == RPMH_MAX_CTRLR) { + ctrlr = ERR_PTR(-ENOMEM); + break; + } + rpmh_rsc[i].drv = drv; + ctrlr = &rpmh_rsc[i]; + break; + } + } + spin_unlock_irqrestore(&rpmh_rsc_lock, flags); + + return ctrlr; +} + +void rpmh_tx_done(const struct tcs_request *msg, int r) +{ + struct rpmh_request *rpm_msg = container_of(msg, struct rpmh_request, + msg); + struct completion *compl = rpm_msg->completion; + + rpm_msg->err = r; + + if (r) + dev_err(rpm_msg->dev, "RPMH TX fail in msg addr=%#x, err=%d\n", + rpm_msg->msg.cmds[0].addr, r); + + /* Signal the blocking thread we are done */ + if (compl) + complete(compl); +} +EXPORT_SYMBOL(rpmh_tx_done); + +/** + * __rpmh_write: send the RPMH request + * + * @dev: The device making the request + * @state: Active/Sleep request type + * @rpm_msg: The data that needs to be sent (cmds). + */ +static int __rpmh_write(const struct device *dev, enum rpmh_state state, + struct rpmh_request *rpm_msg) +{ + struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev); + + if (IS_ERR(ctrlr)) + return PTR_ERR(ctrlr); + + rpm_msg->msg.state = state; + + if (state != RPMH_ACTIVE_ONLY_STATE) + return -EINVAL; + + WARN_ON(irqs_disabled()); + + return rpmh_rsc_send_data(ctrlr->drv, &rpm_msg->msg); +} + +/** + * rpmh_write: Write a set of RPMH commands and block until response + * + * @rc: The RPMH handle got from rpmh_get_client + * @state: Active/sleep set + * @cmd: The payload data + * @n: The number of elements in @cmd + * + * May sleep. Do not call from atomic contexts. + */ +int rpmh_write(const struct device *dev, enum rpmh_state state, + const struct tcs_cmd *cmd, u32 n) +{ + DECLARE_COMPLETION_ONSTACK(compl); + DEFINE_RPMH_MSG_ONSTACK(dev, state, &compl, rpm_msg); + int ret; + + if (!cmd || !n || n > MAX_RPMH_PAYLOAD) + return -EINVAL; + + memcpy(rpm_msg.cmd, cmd, n * sizeof(*cmd)); + rpm_msg.msg.num_cmds = n; + + ret = __rpmh_write(dev, state, &rpm_msg); + if (ret) + return ret; + + ret = wait_for_completion_timeout(&compl, RPMH_TIMEOUT_MS); + return (ret > 0) ? 0 : -ETIMEDOUT; +} +EXPORT_SYMBOL(rpmh_write); diff --git a/include/soc/qcom/rpmh.h b/include/soc/qcom/rpmh.h new file mode 100644 index 000000000000..c1d0f902bd71 --- /dev/null +++ b/include/soc/qcom/rpmh.h @@ -0,0 +1,25 @@ +/* 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 + + +#if IS_ENABLED(CONFIG_QCOM_RPMH) +int rpmh_write(const struct device *dev, enum rpmh_state state, + const struct tcs_cmd *cmd, u32 n); + +#else + +static inline int rpmh_write(const struct device *dev, enum rpmh_state state, + const struct tcs_cmd *cmd, u32 n) +{ return -ENODEV; } + +#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