mirror of https://gitee.com/openkylin/linux.git
133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2014 Linaro Ltd.
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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/* System ID in syscon */
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#define REALVIEW_SYS_ID_OFFSET 0x00
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static const struct of_device_id realview_soc_of_match[] = {
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{ .compatible = "arm,realview-eb-soc", },
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{ .compatible = "arm,realview-pb1176-soc", },
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{ .compatible = "arm,realview-pb11mp-soc", },
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{ .compatible = "arm,realview-pba8-soc", },
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{ .compatible = "arm,realview-pbx-soc", },
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{ }
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};
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static u32 realview_coreid;
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static const char *realview_arch_str(u32 id)
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{
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switch ((id >> 8) & 0xf) {
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case 0x04:
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return "AHB";
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case 0x05:
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return "Multi-layer AXI";
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default:
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return "Unknown";
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}
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}
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static ssize_t
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manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%02x\n", realview_coreid >> 24);
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}
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static DEVICE_ATTR_RO(manufacturer);
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static ssize_t
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board_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "HBI-%03x\n", ((realview_coreid >> 16) & 0xfff));
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}
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static DEVICE_ATTR_RO(board);
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static ssize_t
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fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
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}
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static DEVICE_ATTR_RO(fpga);
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static ssize_t
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build_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
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}
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static DEVICE_ATTR_RO(build);
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static struct attribute *realview_attrs[] = {
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&dev_attr_manufacturer.attr,
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&dev_attr_board.attr,
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&dev_attr_fpga.attr,
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&dev_attr_build.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(realview);
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static int realview_soc_probe(struct platform_device *pdev)
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{
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struct regmap *syscon_regmap;
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struct soc_device *soc_dev;
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struct soc_device_attribute *soc_dev_attr;
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struct device_node *np = pdev->dev.of_node;
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int ret;
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syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap");
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if (IS_ERR(syscon_regmap))
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return PTR_ERR(syscon_regmap);
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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ret = of_property_read_string(np, "compatible",
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&soc_dev_attr->soc_id);
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if (ret)
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return -EINVAL;
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soc_dev_attr->machine = "RealView";
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soc_dev_attr->family = "Versatile";
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soc_dev_attr->custom_attr_group = realview_groups[0];
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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kfree(soc_dev_attr);
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return -ENODEV;
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}
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ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
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&realview_coreid);
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if (ret)
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return -ENODEV;
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dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n",
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realview_coreid,
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((realview_coreid >> 16) & 0xfff));
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/* FIXME: add attributes for SoC to sysfs */
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return 0;
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}
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static struct platform_driver realview_soc_driver = {
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.probe = realview_soc_probe,
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.driver = {
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.name = "realview-soc",
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.of_match_table = realview_soc_of_match,
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},
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};
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builtin_platform_driver(realview_soc_driver);
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