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[104.188.17.28]) by smtp.gmail.com with ESMTPSA id 134sm13590085pgb.78.2018.11.12.00.02.07 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Nov 2018 00:02:08 -0800 (PST) From: Bjorn Andersson To: Andy Gross , David Brown Cc: Rob Herring , Mark Rutland , linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] soc: qcom: Add AOSS QMP communication driver Date: Mon, 12 Nov 2018 00:05:56 -0800 Message-Id: <20181112080557.22698-3-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20181112080557.22698-1-bjorn.andersson@linaro.org> References: <20181112080557.22698-1-bjorn.andersson@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The AOSS QMP driver is used to communicate with the AOSS for certain side-channel requests, that are not enabled through the RPMh interface. The communication is a very simple synchronous mechanism of messages being written in message RAM and a doorbell in the AOSS is rung. As the AOSS has processed the message length is cleared and an interrupt is fired by the AOSS as acknowledgment. Signed-off-by: Bjorn Andersson --- drivers/soc/qcom/Kconfig | 7 + drivers/soc/qcom/Makefile | 1 + drivers/soc/qcom/aoss-qmp.c | 313 ++++++++++++++++++++++++++++++ include/linux/soc/qcom/aoss-qmp.h | 12 ++ 4 files changed, 333 insertions(+) create mode 100644 drivers/soc/qcom/aoss-qmp.c create mode 100644 include/linux/soc/qcom/aoss-qmp.h -- 2.18.0 diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig index a51458022d21..ba08fc00d7f5 100644 --- a/drivers/soc/qcom/Kconfig +++ b/drivers/soc/qcom/Kconfig @@ -3,6 +3,13 @@ # menu "Qualcomm SoC drivers" +config QCOM_AOSS_QMP + tristate "Qualcomm AOSS Messaging Driver" + help + This driver provides the means for communicating with the + micro-controller in the AOSS, using QMP, to control certain resource + that are not exposed through RPMh. + config QCOM_COMMAND_DB bool "Qualcomm Command DB" depends on ARCH_QCOM || COMPILE_TEST diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile index 67cb85d0373c..d0d7fdc94d9a 100644 --- a/drivers/soc/qcom/Makefile +++ b/drivers/soc/qcom/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 CFLAGS_rpmh-rsc.o := -I$(src) +obj-$(CONFIG_QCOM_AOSS_QMP) += aoss-qmp.o obj-$(CONFIG_QCOM_GENI_SE) += qcom-geni-se.o obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o diff --git a/drivers/soc/qcom/aoss-qmp.c b/drivers/soc/qcom/aoss-qmp.c new file mode 100644 index 000000000000..acc5677a06ed --- /dev/null +++ b/drivers/soc/qcom/aoss-qmp.c @@ -0,0 +1,313 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018, Linaro Ltd + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#define QMP_DESC_MAGIC 0x0 +#define QMP_DESC_VERSION 0x4 +#define QMP_DESC_FEATURES 0x8 + +#define QMP_DESC_UCORE_LINK_STATE 0xc +#define QMP_DESC_UCORE_LINK_STATE_ACK 0x10 +#define QMP_DESC_UCORE_CH_STATE 0x14 +#define QMP_DESC_UCORE_CH_STATE_ACK 0x18 +#define QMP_DESC_UCORE_MBOX_SIZE 0x1c +#define QMP_DESC_UCORE_MBOX_OFFSET 0x20 + +#define QMP_DESC_MCORE_LINK_STATE 0x24 +#define QMP_DESC_MCORE_LINK_STATE_ACK 0x28 +#define QMP_DESC_MCORE_CH_STATE 0x2c +#define QMP_DESC_MCORE_CH_STATE_ACK 0x30 +#define QMP_DESC_MCORE_MBOX_SIZE 0x34 +#define QMP_DESC_MCORE_MBOX_OFFSET 0x38 + +#define QMP_STATE_UP 0x0000ffff +#define QMP_STATE_DOWN 0xffff0000 + +#define QMP_MAGIC 0x4d41494c +#define QMP_VERSION 1 + +/** + * struct qmp - driver state for QMP implementation + * @msgram: iomem referencing the message RAM used for communication + * @dev: reference to QMP device + * @mbox_client: mailbox client used to ring the doorbell on transmit + * @mbox_chan: mailbox channel used to ring the doorbell on transmit + * @offset: offset within @msgram where messages should be written + * @size: maximum size of the messages to be transmitted + * @event: wait_queue for synchronization with the IRQ + * @tx_lock: provides syncrhonization between multiple callers of qmp_send() + */ +struct qmp { + void __iomem *msgram; + struct device *dev; + + struct mbox_client mbox_client; + struct mbox_chan *mbox_chan; + + size_t offset; + size_t size; + + wait_queue_head_t event; + + struct mutex tx_lock; +}; + +static void qmp_kick(struct qmp *qmp) +{ + mbox_send_message(qmp->mbox_chan, NULL); + mbox_client_txdone(qmp->mbox_chan, 0); +} + +static bool qmp_magic_valid(struct qmp *qmp) +{ + return readl(qmp->msgram + QMP_DESC_MAGIC) == QMP_MAGIC; +} + +static bool qmp_link_acked(struct qmp *qmp) +{ + return readl(qmp->msgram + QMP_DESC_MCORE_LINK_STATE_ACK) == QMP_STATE_UP; +} + +static bool qmp_mcore_channel_acked(struct qmp *qmp) +{ + return readl(qmp->msgram + QMP_DESC_MCORE_CH_STATE_ACK) == QMP_STATE_UP; +} + +static bool qmp_ucore_channel_up(struct qmp *qmp) +{ + return readl(qmp->msgram + QMP_DESC_UCORE_CH_STATE) == QMP_STATE_UP; +} + +static int qmp_open(struct qmp *qmp) +{ + int ret; + u32 val; + + ret = wait_event_timeout(qmp->event, qmp_magic_valid(qmp), HZ); + if (!ret) { + dev_err(qmp->dev, "QMP magic doesn't match\n"); + return -ETIMEDOUT; + } + + val = readl(qmp->msgram + QMP_DESC_VERSION); + if (val != QMP_VERSION) { + dev_err(qmp->dev, "unsupported QMP version %d\n", val); + return -EINVAL; + } + + qmp->offset = readl(qmp->msgram + QMP_DESC_MCORE_MBOX_OFFSET); + qmp->size = readl(qmp->msgram + QMP_DESC_MCORE_MBOX_SIZE); + if (!qmp->size) { + dev_err(qmp->dev, "invalid mailbox size 0x%zx\n", qmp->size); + return -EINVAL; + } + + /* Ack remote core's link state */ + val = readl(qmp->msgram + QMP_DESC_UCORE_LINK_STATE); + writel(val, qmp->msgram + QMP_DESC_UCORE_LINK_STATE_ACK); + + /* Set local core's link state to up */ + writel(QMP_STATE_UP, qmp->msgram + QMP_DESC_MCORE_LINK_STATE); + + qmp_kick(qmp); + + ret = wait_event_timeout(qmp->event, qmp_link_acked(qmp), HZ); + if (!ret) { + dev_err(qmp->dev, "ucore didn't ack link\n"); + goto timeout_close_link; + } + + writel(QMP_STATE_UP, qmp->msgram + QMP_DESC_MCORE_CH_STATE); + + ret = wait_event_timeout(qmp->event, qmp_ucore_channel_up(qmp), HZ); + if (!ret) { + dev_err(qmp->dev, "ucore didn't open channel\n"); + goto timeout_close_channel; + } + + /* Ack remote core's channel state */ + val = readl(qmp->msgram + QMP_DESC_UCORE_CH_STATE); + writel(val, qmp->msgram + QMP_DESC_UCORE_CH_STATE_ACK); + + qmp_kick(qmp); + + ret = wait_event_timeout(qmp->event, qmp_mcore_channel_acked(qmp), HZ); + if (!ret) { + dev_err(qmp->dev, "ucore didn't ack channel\n"); + goto timeout_close_channel; + } + + return 0; + +timeout_close_channel: + writel(QMP_STATE_DOWN, qmp->msgram + QMP_DESC_MCORE_CH_STATE); + +timeout_close_link: + writel(QMP_STATE_DOWN, qmp->msgram + QMP_DESC_MCORE_LINK_STATE); + qmp_kick(qmp); + + return -ETIMEDOUT; +} + +static void qmp_close(struct qmp *qmp) +{ + writel(QMP_STATE_DOWN, qmp->msgram + QMP_DESC_MCORE_CH_STATE); + writel(QMP_STATE_DOWN, qmp->msgram + QMP_DESC_MCORE_LINK_STATE); + qmp_kick(qmp); +} + +static irqreturn_t qmp_intr(int irq, void *data) +{ + struct qmp *qmp = data; + + wake_up_interruptible_all(&qmp->event); + + return IRQ_HANDLED; +} + +static bool qmp_message_empty(struct qmp *qmp) +{ + return readl(qmp->msgram + qmp->offset) == 0; +} + +/** + * qmp_send() - send a message to the AOSS + * @qmp: qmp context + * @data: message to be sent + * @len: length of the message + * + * Transmit @data to AOSS and wait for the AOSS to acknowledge the message. + * @len must be a multiple of 4 and not longer than the mailbox size. Access is + * synchronized by this implementation. + * + * Return: 0 on success, negative errno on failure + */ +int qmp_send(struct qmp *qmp, const void *data, size_t len) +{ + int ret; + + if (WARN_ON(len + sizeof(u32) > qmp->size)) { + dev_err(qmp->dev, "message too long\n"); + return -EINVAL; + } + + if (WARN_ON(len % sizeof(u32))) { + dev_err(qmp->dev, "message not 32-bit aligned\n"); + return -EINVAL; + } + + mutex_lock(&qmp->tx_lock); + + if (!qmp_message_empty(qmp)) { + dev_err(qmp->dev, "mailbox left busy\n"); + ret = -EINVAL; + goto out_unlock; + } + + /* The message RAM only implements 32-bit accesses */ + __iowrite32_copy(qmp->msgram + qmp->offset + sizeof(u32), + data, len / sizeof(u32)); + writel(len, qmp->msgram + qmp->offset); + qmp_kick(qmp); + + ret = wait_event_interruptible_timeout(qmp->event, + qmp_message_empty(qmp), HZ); + if (!ret) { + dev_err(qmp->dev, "ucore did not ack channel\n"); + ret = -ETIMEDOUT; + + writel(0, qmp->msgram + qmp->offset); + } else { + ret = 0; + } + +out_unlock: + mutex_unlock(&qmp->tx_lock); + + return ret; +} +EXPORT_SYMBOL(qmp_send); + +static int qmp_probe(struct platform_device *pdev) +{ + struct resource *res; + struct qmp *qmp; + int irq; + int ret; + + qmp = devm_kzalloc(&pdev->dev, sizeof(*qmp), GFP_KERNEL); + if (!qmp) + return -ENOMEM; + + qmp->dev = &pdev->dev; + init_waitqueue_head(&qmp->event); + mutex_init(&qmp->tx_lock); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + qmp->msgram = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(qmp->msgram)) + return PTR_ERR(qmp->msgram); + + qmp->mbox_client.dev = &pdev->dev; + qmp->mbox_client.knows_txdone = true; + qmp->mbox_chan = mbox_request_channel(&qmp->mbox_client, 0); + if (IS_ERR(qmp->mbox_chan)) { + dev_err(&pdev->dev, "failed to acquire ipc mailbox\n"); + return PTR_ERR(qmp->mbox_chan); + } + + irq = platform_get_irq(pdev, 0); + ret = devm_request_irq(&pdev->dev, irq, qmp_intr, IRQF_ONESHOT, + "aoss-qmp", qmp); + if (ret < 0) { + dev_err(&pdev->dev, "failed to request interrupt\n"); + return ret; + } + + ret = qmp_open(qmp); + if (ret < 0) + return ret; + + platform_set_drvdata(pdev, qmp); + + return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); +} + +static int qmp_remove(struct platform_device *pdev) +{ + struct qmp *qmp = platform_get_drvdata(pdev); + + of_platform_depopulate(&pdev->dev); + + qmp_close(qmp); + + return 0; +} + +static const struct of_device_id qmp_dt_match[] = { + { .compatible = "qcom,sdm845-aoss-qmp", }, + {} +}; +MODULE_DEVICE_TABLE(of, qmp_dt_match); + +static struct platform_driver qmp_driver = { + .driver = { + .name = "aoss_qmp", + .of_match_table = qmp_dt_match, + }, + .probe = qmp_probe, + .remove = qmp_remove, +}; +module_platform_driver(qmp_driver); + +MODULE_DESCRIPTION("Qualcomm AOSS QMP driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/soc/qcom/aoss-qmp.h b/include/linux/soc/qcom/aoss-qmp.h new file mode 100644 index 000000000000..32ccaa091a9f --- /dev/null +++ b/include/linux/soc/qcom/aoss-qmp.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2018, Linaro Ltd + */ +#ifndef __AOP_QMP_H__ +#define __AOP_QMP_H__ + +struct qmp; + +int qmp_send(struct qmp *qmp, const void *data, size_t len); + +#endif From patchwork Mon Nov 12 08:05:57 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Andersson X-Patchwork-Id: 150796 Delivered-To: patch@linaro.org Received: by 2002:a2e:299d:0:0:0:0:0 with SMTP id p29-v6csp2858959ljp; Mon, 12 Nov 2018 00:02:13 -0800 (PST) X-Google-Smtp-Source: AJdET5fF45uuPAQJZGOmZBSWO0vjjAwOA5kNH988b9c/5ZXPACUc/GtjY3Z98GIYMu9qIGW312Z3 X-Received: by 2002:a63:990a:: with SMTP id d10mr16638048pge.279.1542009733428; Mon, 12 Nov 2018 00:02:13 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1542009733; cv=none; d=google.com; s=arc-20160816; b=SUhn8gI+vZXKllhXI4NtAxPKRHqydwnbak2Aev4afNltKukgdELvo3eDGjkTLvB1B9 LJzAWuHZ+cEn0Ki29OpDUY7qhC5CIl70iT3F9zn0fLeN1Bjgjmaa7e707W4HTtEfgxqE /iKYMyhTT3R2GK+xbE5bN0nGy5Ljsqzy5mmc0RgyMK8MQgyOwnTzTDXWU7aVK8y2C9jV nYYRsdZptSujfVxMW1F4u/inCil1T8+cFJ+ibIHUuSShiASBIBkkvbp7w4/vt/1SmDHA /cnAAzk+sUN8AGY2JUWyAAzvlosgUzeQ3qUmTMzsFuIShe00IrQQPVTIZPSduFrT05IK GsCw== ARC-Message-Signature: i=1; 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[104.188.17.28]) by smtp.gmail.com with ESMTPSA id 134sm13590085pgb.78.2018.11.12.00.02.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Nov 2018 00:02:09 -0800 (PST) From: Bjorn Andersson To: Andy Gross , David Brown Cc: Rob Herring , Mark Rutland , linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] soc: qcom: Add AOSS QMP genpd provider Date: Mon, 12 Nov 2018 00:05:57 -0800 Message-Id: <20181112080557.22698-4-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20181112080557.22698-1-bjorn.andersson@linaro.org> References: <20181112080557.22698-1-bjorn.andersson@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The AOSS QMP genpd provider implements control over power-related resources related to low-power state associated with the remoteprocs in the system as well as control over a set of clocks related to debug hardware in the SoC. Signed-off-by: Bjorn Andersson --- drivers/soc/qcom/Kconfig | 8 ++ drivers/soc/qcom/Makefile | 1 + drivers/soc/qcom/aoss-qmp-pd.c | 135 +++++++++++++++++++++++++++++++++ 3 files changed, 144 insertions(+) create mode 100644 drivers/soc/qcom/aoss-qmp-pd.c -- 2.18.0 diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig index ba08fc00d7f5..e1eda3d59748 100644 --- a/drivers/soc/qcom/Kconfig +++ b/drivers/soc/qcom/Kconfig @@ -10,6 +10,14 @@ config QCOM_AOSS_QMP micro-controller in the AOSS, using QMP, to control certain resource that are not exposed through RPMh. +config QCOM_AOSS_QMP_PD + tristate "Qualcomm AOSS Messaging Power Domain driver" + depends on QCOM_AOSS_QMP + help + This driver provides the means of controlling the AOSSs handling of + low-power state for resources related to the remoteproc subsystems as + well as controlling the debug clocks. + config QCOM_COMMAND_DB bool "Qualcomm Command DB" depends on ARCH_QCOM || COMPILE_TEST diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile index d0d7fdc94d9a..ebfa414a5b77 100644 --- a/drivers/soc/qcom/Makefile +++ b/drivers/soc/qcom/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 CFLAGS_rpmh-rsc.o := -I$(src) obj-$(CONFIG_QCOM_AOSS_QMP) += aoss-qmp.o +obj-$(CONFIG_QCOM_AOSS_QMP_PD) += aoss-qmp-pd.o obj-$(CONFIG_QCOM_GENI_SE) += qcom-geni-se.o obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o diff --git a/drivers/soc/qcom/aoss-qmp-pd.c b/drivers/soc/qcom/aoss-qmp-pd.c new file mode 100644 index 000000000000..467d0db4abfa --- /dev/null +++ b/drivers/soc/qcom/aoss-qmp-pd.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018, Linaro Ltd + */ +#include +#include +#include +#include +#include +#include + +#include + +struct qmp_pd { + struct qmp *qmp; + + struct generic_pm_domain pd; + + const char *name; +}; + +#define to_qmp_pd_resource(res) container_of(res, struct qmp_pd, pd) + +struct qmp_pd_resource { + const char *name; + int (*on)(struct generic_pm_domain *domain); + int (*off)(struct generic_pm_domain *domain); +}; + +static int qmp_pd_clock_toggle(struct qmp_pd *res, bool enable) +{ + char buf[96]; + size_t n; + + n = snprintf(buf, sizeof(buf), "{class: clock, res: %s, val: %d}", + res->name, !!enable); + return qmp_send(res->qmp, buf, n); +} + +static int qmp_pd_clock_on(struct generic_pm_domain *domain) +{ + return qmp_pd_clock_toggle(to_qmp_pd_resource(domain), true); +} + +static int qmp_pd_clock_off(struct generic_pm_domain *domain) +{ + return qmp_pd_clock_toggle(to_qmp_pd_resource(domain), false); +} + +static int qmp_pd_image_toggle(struct qmp_pd *res, bool enable) +{ + char buf[96]; + size_t n; + + n = snprintf(buf, sizeof(buf), + "{class: image, res: load_state, name: %s, val: %s}", + res->name, enable ? "on" : "off"); + return qmp_send(res->qmp, buf, sizeof(buf)); +} + +static int qmp_pd_image_on(struct generic_pm_domain *domain) +{ + return qmp_pd_image_toggle(to_qmp_pd_resource(domain), true); +} + +static int qmp_pd_image_off(struct generic_pm_domain *domain) +{ + return qmp_pd_image_toggle(to_qmp_pd_resource(domain), false); +} + +static const struct qmp_pd_resource sdm845_resources[] = { + [AOSS_QMP_QDSS_CLK] = { "qdss", qmp_pd_clock_on, qmp_pd_clock_off }, + [AOSS_QMP_LS_CDSP] = { "cdsp", qmp_pd_image_on, qmp_pd_image_off }, + [AOSS_QMP_LS_LPASS] = { "adsp", qmp_pd_image_on, qmp_pd_image_off }, + [AOSS_QMP_LS_MODEM] = { "modem", qmp_pd_image_on, qmp_pd_image_off }, + [AOSS_QMP_LS_SLPI] = { "slpi", qmp_pd_image_on, qmp_pd_image_off }, + [AOSS_QMP_LS_SPSS] = { "spss", qmp_pd_image_on, qmp_pd_image_off }, + [AOSS_QMP_LS_VENUS] = { "venus", qmp_pd_image_on, qmp_pd_image_off }, +}; + +static int qmp_pd_probe(struct platform_device *pdev) +{ + struct genpd_onecell_data *data; + struct qmp_pd *res; + struct qmp *qmp; + size_t num = ARRAY_SIZE(sdm845_resources); + int i; + + qmp = dev_get_drvdata(pdev->dev.parent); + if (!qmp) + return -EINVAL; + + res = devm_kcalloc(&pdev->dev, num, sizeof(*res), GFP_KERNEL); + if (!res) + return -ENOMEM; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->domains = devm_kcalloc(&pdev->dev, num, sizeof(*data->domains), + GFP_KERNEL); + + for (i = 0; i < num; i++) { + pm_genpd_init(&res[i].pd, NULL, true); + res[i].qmp = qmp; + res[i].name = sdm845_resources[i].name; + + res[i].pd.name = sdm845_resources[i].name; + res[i].pd.power_on = sdm845_resources[i].on; + res[i].pd.power_off = sdm845_resources[i].off; + + data->domains[data->num_domains++] = &res[i].pd; + } + + return of_genpd_add_provider_onecell(pdev->dev.of_node, data); +} + +static const struct of_device_id qmp_pd_dt_match[] = { + { .compatible = "qcom,sdm845-aoss-qmp-pd", }, + {} +}; +MODULE_DEVICE_TABLE(of, qmp_pd_dt_match); + +static struct platform_driver qmp_pd_driver = { + .driver = { + .name = "aoss_qmp_pd", + .of_match_table = qmp_pd_dt_match, + }, + .probe = qmp_pd_probe, +}; +module_platform_driver(qmp_pd_driver); + +MODULE_DESCRIPTION("Qualcomm AOSS QMP load-state driver"); +MODULE_LICENSE("GPL v2");