[mirror_ubuntu-jammy-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
manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%02x\n", realview_coreid >> 24);
}

static DEVICE_ATTR_RO(manufacturer);

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

static DEVICE_ATTR_RO(board);

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

static DEVICE_ATTR_RO(fpga);

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

static DEVICE_ATTR_RO(build);

static struct attribute *realview_attrs[] = {
	&dev_attr_manufacturer.attr,
	&dev_attr_board.attr,
	&dev_attr_fpga.attr,
	&dev_attr_build.attr,
	NULL
};

ATTRIBUTE_GROUPS(realview);

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_attr->custom_attr_group = realview_groups[0];
	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;

	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
5feebc65 SH	42	static ssize_t
5feebc65 SH	43	manufacturer_show(struct device dev, struct device_attribute attr, char *buf)
a2974c9c LW	44	{
	45	return sprintf(buf, "%02x\n", realview_coreid >> 24);
	46	}
	47
5feebc65	48	static DEVICE_ATTR_RO(manufacturer);
a2974c9c	49
5feebc65 SH	50	static ssize_t
5feebc65 SH	51	board_show(struct device dev, struct device_attribute attr, char *buf)
a2974c9c	52	{
fccc2b36	53	return sprintf(buf, "HBI-%03x\n", ((realview_coreid >> 16) & 0xfff));
a2974c9c LW	54	}
a2974c9c LW	55
5feebc65	56	static DEVICE_ATTR_RO(board);
a2974c9c	57
5feebc65 SH	58	static ssize_t
5feebc65 SH	59	fpga_show(struct device dev, struct device_attribute attr, char *buf)
a2974c9c LW	60	{
	61	return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
	62	}
	63
5feebc65	64	static DEVICE_ATTR_RO(fpga);
a2974c9c	65
5feebc65 SH	66	static ssize_t
5feebc65 SH	67	build_show(struct device dev, struct device_attribute attr, char *buf)
a2974c9c LW	68	{
	69	return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
	70	}
	71
5feebc65	72	static DEVICE_ATTR_RO(build);
a2974c9c	73
99d50b9b SH	74	static struct attribute *realview_attrs[] = {
	75	&dev_attr_manufacturer.attr,
	76	&dev_attr_board.attr,
	77	&dev_attr_fpga.attr,
	78	&dev_attr_build.attr,
	79	NULL
	80	};
	81
	82	ATTRIBUTE_GROUPS(realview);
	83
a2974c9c LW	84	static int realview_soc_probe(struct platform_device *pdev)
a2974c9c LW	85	{
db86ab06	86	struct regmap *syscon_regmap;
a2974c9c LW	87	struct soc_device *soc_dev;
	88	struct soc_device_attribute *soc_dev_attr;
	89	struct device_node *np = pdev->dev.of_node;
	90	int ret;
	91
	92	syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap");
	93	if (IS_ERR(syscon_regmap))
	94	return PTR_ERR(syscon_regmap);
	95
	96	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
	97	if (!soc_dev_attr)
	98	return -ENOMEM;
	99
	100	ret = of_property_read_string(np, "compatible",
	101	&soc_dev_attr->soc_id);
	102	if (ret)
	103	return -EINVAL;
	104
	105	soc_dev_attr->machine = "RealView";
	106	soc_dev_attr->family = "Versatile";
99d50b9b	107	soc_dev_attr->custom_attr_group = realview_groups[0];
a2974c9c LW	108	soc_dev = soc_device_register(soc_dev_attr);
	109	if (IS_ERR(soc_dev)) {
	110	kfree(soc_dev_attr);
	111	return -ENODEV;
	112	}
	113	ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
	114	&realview_coreid);
	115	if (ret)
	116	return -ENODEV;
	117
fccc2b36 LW	118	dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n",
	119	realview_coreid,
	120	((realview_coreid >> 16) & 0xfff));
a2974c9c LW	121	/* FIXME: add attributes for SoC to sysfs */
	122	return 0;
	123	}
	124
	125	static struct platform_driver realview_soc_driver = {
	126	.probe = realview_soc_probe,
	127	.driver = {
	128	.name = "realview-soc",
	129	.of_match_table = realview_soc_of_match,
	130	},
	131	};
0159ae95	132	builtin_platform_driver(realview_soc_driver);