[mirror_ubuntu-eoan-kernel.git] / drivers / soc / versatile / soc-realview.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2014 Linaro Ltd.
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 */
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/platform_device.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/of.h>

/* System ID in syscon */
#define REALVIEW_SYS_ID_OFFSET 0x00

static const struct of_device_id realview_soc_of_match[] = {
	{ .compatible = "arm,realview-eb-soc",	},
	{ .compatible = "arm,realview-pb1176-soc", },
	{ .compatible = "arm,realview-pb11mp-soc", },
	{ .compatible = "arm,realview-pba8-soc", },
	{ .compatible = "arm,realview-pbx-soc", },
	{ }
};

static u32 realview_coreid;

static const char *realview_arch_str(u32 id)
{
	switch ((id >> 8) & 0xf) {
	case 0x04:
		return "AHB";
	case 0x05:
		return "Multi-layer AXI";
	default:
		return "Unknown";
	}
}

static ssize_t realview_get_manf(struct device *dev,
			      struct device_attribute *attr,
			      char *buf)
{
	return sprintf(buf, "%02x\n", realview_coreid >> 24);
}

static struct device_attribute realview_manf_attr =
	__ATTR(manufacturer,  S_IRUGO, realview_get_manf,  NULL);

static ssize_t realview_get_board(struct device *dev,
			      struct device_attribute *attr,
			      char *buf)
{
	return sprintf(buf, "HBI-%03x\n", ((realview_coreid >> 16) & 0xfff));
}

static struct device_attribute realview_board_attr =
	__ATTR(board,  S_IRUGO, realview_get_board,  NULL);

static ssize_t realview_get_arch(struct device *dev,
			      struct device_attribute *attr,
			      char *buf)
{
	return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
}

static struct device_attribute realview_arch_attr =
	__ATTR(fpga,  S_IRUGO, realview_get_arch,  NULL);

static ssize_t realview_get_build(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
}

static struct device_attribute realview_build_attr =
	__ATTR(build,  S_IRUGO, realview_get_build,  NULL);

static int realview_soc_probe(struct platform_device *pdev)
{
	struct regmap *syscon_regmap;
	struct soc_device *soc_dev;
	struct soc_device_attribute *soc_dev_attr;
	struct device_node *np = pdev->dev.of_node;
	int ret;

	syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap");
	if (IS_ERR(syscon_regmap))
		return PTR_ERR(syscon_regmap);

	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
	if (!soc_dev_attr)
		return -ENOMEM;

	ret = of_property_read_string(np, "compatible",
				      &soc_dev_attr->soc_id);
	if (ret)
		return -EINVAL;

	soc_dev_attr->machine = "RealView";
	soc_dev_attr->family = "Versatile";
	soc_dev = soc_device_register(soc_dev_attr);
	if (IS_ERR(soc_dev)) {
		kfree(soc_dev_attr);
		return -ENODEV;
	}
	ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
			  &realview_coreid);
	if (ret)
		return -ENODEV;

	device_create_file(soc_device_to_device(soc_dev), &realview_manf_attr);
	device_create_file(soc_device_to_device(soc_dev), &realview_board_attr);
	device_create_file(soc_device_to_device(soc_dev), &realview_arch_attr);
	device_create_file(soc_device_to_device(soc_dev), &realview_build_attr);

	dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n",
		 realview_coreid,
		 ((realview_coreid >> 16) & 0xfff));
	/* FIXME: add attributes for SoC to sysfs */
	return 0;
}

static struct platform_driver realview_soc_driver = {
	.probe = realview_soc_probe,
	.driver = {
		.name = "realview-soc",
		.of_match_table = realview_soc_of_match,
	},
};
builtin_platform_driver(realview_soc_driver);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
a2974c9c LW	2	/*
	3	* Copyright (C) 2014 Linaro Ltd.
	4	*
	5	* Author: Linus Walleij <linus.walleij@linaro.org>
a2974c9c LW	6	*/
	7	#include <linux/init.h>
	8	#include <linux/io.h>
	9	#include <linux/slab.h>
	10	#include <linux/sys_soc.h>
	11	#include <linux/platform_device.h>
	12	#include <linux/mfd/syscon.h>
	13	#include <linux/regmap.h>
	14	#include <linux/of.h>
	15
	16	/* System ID in syscon */
	17	#define REALVIEW_SYS_ID_OFFSET 0x00
	18
	19	static const struct of_device_id realview_soc_of_match[] = {
	20	{ .compatible = "arm,realview-eb-soc", },
	21	{ .compatible = "arm,realview-pb1176-soc", },
	22	{ .compatible = "arm,realview-pb11mp-soc", },
	23	{ .compatible = "arm,realview-pba8-soc", },
	24	{ .compatible = "arm,realview-pbx-soc", },
157a1b17	25	{ }
a2974c9c LW	26	};
	27
	28	static u32 realview_coreid;
	29
a2974c9c LW	30	static const char *realview_arch_str(u32 id)
	31	{
	32	switch ((id >> 8) & 0xf) {
5d87f7a3 LW	33	case 0x04:
5d87f7a3 LW	34	return "AHB";
a2974c9c LW	35	case 0x05:
	36	return "Multi-layer AXI";
	37	default:
	38	return "Unknown";
	39	}
	40	}
	41
	42	static ssize_t realview_get_manf(struct device *dev,
	43	struct device_attribute *attr,
	44	char *buf)
	45	{
	46	return sprintf(buf, "%02x\n", realview_coreid >> 24);
	47	}
	48
	49	static struct device_attribute realview_manf_attr =
	50	__ATTR(manufacturer, S_IRUGO, realview_get_manf, NULL);
	51
	52	static ssize_t realview_get_board(struct device *dev,
	53	struct device_attribute *attr,
	54	char *buf)
	55	{
fccc2b36	56	return sprintf(buf, "HBI-%03x\n", ((realview_coreid >> 16) & 0xfff));
a2974c9c LW	57	}
	58
	59	static struct device_attribute realview_board_attr =
	60	__ATTR(board, S_IRUGO, realview_get_board, NULL);
	61
	62	static ssize_t realview_get_arch(struct device *dev,
	63	struct device_attribute *attr,
	64	char *buf)
	65	{
	66	return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
	67	}
	68
	69	static struct device_attribute realview_arch_attr =
	70	__ATTR(fpga, S_IRUGO, realview_get_arch, NULL);
	71
	72	static ssize_t realview_get_build(struct device *dev,
	73	struct device_attribute *attr,
	74	char *buf)
	75	{
	76	return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
	77	}
	78
	79	static struct device_attribute realview_build_attr =
	80	__ATTR(build, S_IRUGO, realview_get_build, NULL);
	81
	82	static int realview_soc_probe(struct platform_device *pdev)
	83	{
db86ab06	84	struct regmap *syscon_regmap;
a2974c9c LW	85	struct soc_device *soc_dev;
	86	struct soc_device_attribute *soc_dev_attr;
	87	struct device_node *np = pdev->dev.of_node;
	88	int ret;
	89
	90	syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap");
	91	if (IS_ERR(syscon_regmap))
	92	return PTR_ERR(syscon_regmap);
	93
	94	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
	95	if (!soc_dev_attr)
	96	return -ENOMEM;
	97
	98	ret = of_property_read_string(np, "compatible",
	99	&soc_dev_attr->soc_id);
	100	if (ret)
	101	return -EINVAL;
	102
	103	soc_dev_attr->machine = "RealView";
	104	soc_dev_attr->family = "Versatile";
	105	soc_dev = soc_device_register(soc_dev_attr);
	106	if (IS_ERR(soc_dev)) {
	107	kfree(soc_dev_attr);
	108	return -ENODEV;
	109	}
	110	ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
	111	&realview_coreid);
	112	if (ret)
	113	return -ENODEV;
	114
	115	device_create_file(soc_device_to_device(soc_dev), &realview_manf_attr);
	116	device_create_file(soc_device_to_device(soc_dev), &realview_board_attr);
	117	device_create_file(soc_device_to_device(soc_dev), &realview_arch_attr);
	118	device_create_file(soc_device_to_device(soc_dev), &realview_build_attr);
	119
fccc2b36 LW	120	dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n",
	121	realview_coreid,
	122	((realview_coreid >> 16) & 0xfff));
a2974c9c LW	123	/* FIXME: add attributes for SoC to sysfs */
	124	return 0;
	125	}
	126
	127	static struct platform_driver realview_soc_driver = {
	128	.probe = realview_soc_probe,
	129	.driver = {
	130	.name = "realview-soc",
	131	.of_match_table = realview_soc_of_match,
	132	},
	133	};
0159ae95	134	builtin_platform_driver(realview_soc_driver);