drivers/soc/versatile/soc-realview.c

Source file repositories/reference/linux-study-clean/drivers/soc/versatile/soc-realview.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/versatile/soc-realview.c
Extension
.c
Size
3438 bytes
Lines
145
Domain
Driver Families
Bucket
drivers/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2014 Linaro Ltd.
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 */
#include <linux/device.h>
#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 void realview_soc_socdev_release(void *data)
{
	struct soc_device *soc_dev = data;

	soc_device_unregister(soc_dev);
}

Annotation

Implementation Notes