soc: imx: Add SCU SoC info driver support (15f5276a) · Commits · 戴 / test

drivers/soc/imx/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -7,4 +7,13 @@ config IMX_GPCV2_PM_DOMAINS
		select PM_GENERIC_DOMAINS
		default y if SOC_IMX7D

		config IMX_SCU_SOC
		bool "i.MX System Controller Unit SoC info support"
		depends on IMX_SCU
		select SOC_BUS
		help
		If you say yes here you get support for the NXP i.MX System
		Controller Unit SoC info module, it will provide the SoC info
		like SoC family, ID and revision etc.

		endmenu

drivers/soc/imx/Makefile

+1 −0

Original line number	Diff line number	Diff line
		obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
		obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
		obj-$(CONFIG_ARCH_MXC) += soc-imx8.o
		obj-$(CONFIG_IMX_SCU_SOC) += soc-imx-scu.o

drivers/soc/imx/soc-imx-scu.c

0 → 100644

+144 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright 2019 NXP.
		*/

		#include <dt-bindings/firmware/imx/rsrc.h>
		#include <linux/firmware/imx/sci.h>
		#include <linux/slab.h>
		#include <linux/sys_soc.h>
		#include <linux/platform_device.h>
		#include <linux/of.h>

		#define IMX_SCU_SOC_DRIVER_NAME "imx-scu-soc"

		static struct imx_sc_ipc *soc_ipc_handle;

		struct imx_sc_msg_misc_get_soc_id {
		struct imx_sc_rpc_msg hdr;
		union {
		struct {
		u32 control;
		u16 resource;
		} __packed req;
		struct {
		u32 id;
		} resp;
		} data;
		} __packed;

		static int imx_scu_soc_id(void)
		{
		struct imx_sc_msg_misc_get_soc_id msg;
		struct imx_sc_rpc_msg *hdr = &msg.hdr;
		int ret;

		hdr->ver = IMX_SC_RPC_VERSION;
		hdr->svc = IMX_SC_RPC_SVC_MISC;
		hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
		hdr->size = 3;

		msg.data.req.control = IMX_SC_C_ID;
		msg.data.req.resource = IMX_SC_R_SYSTEM;

		ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
		if (ret) {
		pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
		return ret;
		}

		return msg.data.resp.id;
		}

		static int imx_scu_soc_probe(struct platform_device *pdev)
		{
		struct soc_device_attribute *soc_dev_attr;
		struct soc_device *soc_dev;
		int id, ret;
		u32 val;

		ret = imx_scu_get_handle(&soc_ipc_handle);
		if (ret)
		return ret;

		soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
		GFP_KERNEL);
		if (!soc_dev_attr)
		return -ENOMEM;

		soc_dev_attr->family = "Freescale i.MX";

		ret = of_property_read_string(of_root,
		"model",
		&soc_dev_attr->machine);
		if (ret)
		return ret;

		id = imx_scu_soc_id();
		if (id < 0)
		return -EINVAL;

		/* format soc_id value passed from SCU firmware */
		val = id & 0x1f;
		soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x", val);
		if (!soc_dev_attr->soc_id)
		return -ENOMEM;

		/* format revision value passed from SCU firmware */
		val = (id >> 5) & 0xf;
		val = (((val >> 2) + 1) << 4) \| (val & 0x3);
		soc_dev_attr->revision = kasprintf(GFP_KERNEL,
		"%d.%d",
		(val >> 4) & 0xf,
		val & 0xf);
		if (!soc_dev_attr->revision) {
		ret = -ENOMEM;
		goto free_soc_id;
		}

		soc_dev = soc_device_register(soc_dev_attr);
		if (IS_ERR(soc_dev)) {
		ret = PTR_ERR(soc_dev);
		goto free_revision;
		}

		return 0;

		free_revision:
		kfree(soc_dev_attr->revision);
		free_soc_id:
		kfree(soc_dev_attr->soc_id);
		return ret;
		}

		static struct platform_driver imx_scu_soc_driver = {
		.driver = {
		.name = IMX_SCU_SOC_DRIVER_NAME,
		},
		.probe = imx_scu_soc_probe,
		};

		static int __init imx_scu_soc_init(void)
		{
		struct platform_device *pdev;
		struct device_node *np;
		int ret;

		np = of_find_compatible_node(NULL, NULL, "fsl,imx-scu");
		if (!np)
		return -ENODEV;

		of_node_put(np);

		ret = platform_driver_register(&imx_scu_soc_driver);
		if (ret)
		return ret;

		pdev = platform_device_register_simple(IMX_SCU_SOC_DRIVER_NAME,
		-1, NULL, 0);
		if (IS_ERR(pdev))
		platform_driver_unregister(&imx_scu_soc_driver);

		return PTR_ERR_OR_ZERO(pdev);
		}
		device_initcall(imx_scu_soc_init);

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