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Signed-off-by: Peng Fan --- Documentation/devicetree/bindings/arm/arm,scmi.txt | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt b/Documentation/devicetree/bindings/arm/arm,scmi.txt index f493d69e6194..03cff8b55a93 100644 --- a/Documentation/devicetree/bindings/arm/arm,scmi.txt +++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt @@ -14,7 +14,7 @@ Required properties: The scmi node with the following properties shall be under the /firmware/ node. -- compatible : shall be "arm,scmi" +- compatible : shall be "arm,scmi" or "arm,scmi-smc" - mboxes: List of phandle and mailbox channel specifiers. It should contain exactly one or two mailboxes, one for transmitting messages("tx") and another optional for receiving the notifications("rx") if @@ -25,6 +25,8 @@ The scmi node with the following properties shall be under the /firmware/ node. protocol identifier for a given sub-node. - #size-cells : should be '0' as 'reg' property doesn't have any size associated with it. +- arm,smc-id : SMC id required when using smc transports +- arm,hvc-id : HVC id required when using hvc transports Optional properties: From patchwork Thu Feb 6 13:01:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peng Fan X-Patchwork-Id: 11368401 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 46D47109A for ; Thu, 6 Feb 2020 13:07:24 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1ED38217BA for ; 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X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData: qaU7TAe9Gx5TEMtLK9094Q2/s96QdsOVFWuGcX90bhIMjoEsCZ9n8s7/K5kltqe4SsE1Ohwjqii7BKpM9NdDt1VpFjDgVPbjr+cAzO+kasrs1hno9s1pBFv5IrU7cgNOu6nA99WNJ/KzX/dtxuNoDQ== X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 66beea81-a4ee-46ac-6394-08d7ab056ffb X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Feb 2020 13:06:54.1784 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 6c43rapjI4fbPLSB+ywngKForM1p5Q0vIOMf7S6VfsfW/gFzNOcNlKpacf6ZECEghVCkdLzdOMUJN3ptJ8B5eA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB4770 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200206_050656_289506_E02EF469 X-CRM114-Status: GOOD ( 16.96 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [40.107.20.79 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 MSGID_FROM_MTA_HEADER Message-Id was added by a relay X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Peng Fan , f.fainelli@gmail.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, linux-imx@nxp.com, andre.przywara@arm.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Peng Fan Add SCMI smc/hvc transports support. Each protocol could have its own smc/hvc id, or share the same id. There is no Rx, only Tx because of smc/hvc not support Rx. Signed-off-by: Peng Fan --- drivers/firmware/arm_scmi/Makefile | 2 +- drivers/firmware/arm_scmi/common.h | 1 + drivers/firmware/arm_scmi/driver.c | 1 + drivers/firmware/arm_scmi/smc.c | 177 +++++++++++++++++++++++++++++++++++++ 4 files changed, 180 insertions(+), 1 deletion(-) create mode 100644 drivers/firmware/arm_scmi/smc.c diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile index 6694d0d908d6..6b1b0d6c6d0e 100644 --- a/drivers/firmware/arm_scmi/Makefile +++ b/drivers/firmware/arm_scmi/Makefile @@ -2,6 +2,6 @@ obj-y = scmi-bus.o scmi-driver.o scmi-protocols.o scmi-transport.o scmi-bus-y = bus.o scmi-driver-y = driver.o -scmi-transport-y = mailbox.o shmem.o +scmi-transport-y = mailbox.o shmem.o smc.o scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h index 5df262a564a4..f9ff5cdb68be 100644 --- a/drivers/firmware/arm_scmi/common.h +++ b/drivers/firmware/arm_scmi/common.h @@ -207,6 +207,7 @@ struct scmi_desc { }; extern const struct scmi_desc scmi_mailbox_desc; +extern const struct scmi_desc scmi_smc_desc; void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr); void scmi_free_channel(struct scmi_chan_info *cinfo, struct idr *idr, int id); diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index dbec767222e9..c759dd094374 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -827,6 +827,7 @@ ATTRIBUTE_GROUPS(versions); /* Each compatible listed below must have descriptor associated with it */ static const struct of_device_id scmi_of_match[] = { { .compatible = "arm,scmi", .data = &scmi_mailbox_desc }, + { .compatible = "arm,scmi-smc", .data = &scmi_smc_desc }, { /* Sentinel */ }, }; diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c new file mode 100644 index 000000000000..4af0bbc4c827 --- /dev/null +++ b/drivers/firmware/arm_scmi/smc.c @@ -0,0 +1,177 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * System Control and Management Interface (SCMI) Message SMC/HVC + * Transport driver + * + * Copyright 2020 NXP + */ + +#include +#include +#include +#include +#include +#include + +#include "common.h" + +/** + * struct scmi_smc - Structure representing a SCMI smc transport + * + * @cinfo: SCMI channel info + * @shmem: Transmit/Receive shared memory area + * @func_id: smc/hvc call function id + * @smc: Indicate it is smc channel or hvc channel + */ + +struct scmi_smc { + struct scmi_chan_info *cinfo; + struct scmi_shared_mem __iomem *shmem; + u32 func_id; + bool smc; +}; + +#define client_to_scmi_smc(c) container_of(c, struct scmi_smc, cl) + +static bool smc_chan_available(struct device *dev, int idx) +{ + return true; +} + +static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, + bool tx) +{ + struct device *cdev = cinfo->dev; + struct scmi_smc *scmi_info; + struct device_node *shmem; + resource_size_t size; + struct resource res; + u32 func_id; + int ret; + + if (!tx) + return -ENODEV; + + scmi_info = devm_kzalloc(dev, sizeof(*scmi_info), GFP_KERNEL); + if (!scmi_info) + return -ENOMEM; + + shmem = of_parse_phandle(cdev->of_node, "shmem", 0); + if (!shmem) + shmem = of_parse_phandle(dev->of_node, "shmem", 0); + ret = of_address_to_resource(shmem, 0, &res); + of_node_put(shmem); + if (ret) { + dev_err(cdev, "failed to get SCMI Tx shared memory\n"); + return ret; + } + + size = resource_size(&res); + scmi_info->shmem = devm_ioremap(dev, res.start, size); + if (!scmi_info->shmem) { + dev_err(dev, "failed to ioremap SCMI Tx shared memory\n"); + return -EADDRNOTAVAIL; + } + + ret = of_property_read_u32(cdev->of_node, "arm,smc-id", &func_id); + if (ret) + ret = of_property_read_u32(dev->of_node, "arm,smc-id", + &func_id); + if (!ret) { + scmi_info->smc = true; + } else { + ret = of_property_read_u32(cdev->of_node, "arm,hvc-id", + &func_id); + if (ret) + ret = of_property_read_u32(dev->of_node, + "arm,hvc-id", + &func_id); + + if (ret) { + dev_err(dev, "failed to get SCMI arm,smc/hvc_id\n"); + return ret; + } + scmi_info->smc = false; + } + + scmi_info->func_id = func_id; + scmi_info->cinfo = cinfo; + cinfo->transport_info = scmi_info; + + iowrite32(BIT(0), &scmi_info->shmem->channel_status); + + return 0; +} + +static int smc_chan_free(int id, void *p, void *data) +{ + struct scmi_chan_info *cinfo = p; + struct scmi_smc *scmi_info = cinfo->transport_info; + + cinfo->transport_info = NULL; + scmi_info->cinfo = NULL; + + scmi_free_channel(cinfo, data, id); + + return 0; +} + +static int smc_send_message(struct scmi_chan_info *cinfo, + struct scmi_xfer *xfer) +{ + struct scmi_smc *scmi_info = cinfo->transport_info; + struct arm_smccc_res res; + int ret; + + shmem_tx_prepare(scmi_info->shmem, xfer); + + if (scmi_info->smc) + arm_smccc_smc(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res); + else + arm_smccc_hvc(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res); + + ret = res.a0; + if (ret > 0) + ret = 0; + + scmi_rx_callback(scmi_info->cinfo, shmem_read_header(scmi_info->shmem)); + + return ret; +} + +static void smc_mark_txdone(struct scmi_chan_info *cinfo, int ret) +{ +} + +static void smc_fetch_response(struct scmi_chan_info *cinfo, + struct scmi_xfer *xfer) +{ + struct scmi_smc *scmi_info = cinfo->transport_info; + + shmem_fetch_response(scmi_info->shmem, xfer); +} + +static bool +smc_poll_done(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer) +{ + struct scmi_smc *scmi_info = cinfo->transport_info; + + return shmem_poll_done(scmi_info->shmem, xfer); +} + +static struct scmi_transport_ops scmi_smc_ops = { + .chan_available = smc_chan_available, + .chan_setup = smc_chan_setup, + .chan_free = smc_chan_free, + .send_message = smc_send_message, + .mark_txdone = smc_mark_txdone, + .fetch_response = smc_fetch_response, + .poll_done = smc_poll_done, +}; + +const struct scmi_desc scmi_smc_desc = { + .ops = &scmi_smc_ops, + .max_rx_timeout_ms = 30, + .max_msg = 1, + .max_msg_size = 128, +};