2 * Copyright (C) 2014 Linaro Ltd.
4 * Author: Linus Walleij <linus.walleij@linaro.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2, as
8 * published by the Free Software Foundation.
11 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/sys_soc.h>
15 #include <linux/platform_device.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/regmap.h>
20 /* System ID in syscon */
21 #define REALVIEW_SYS_ID_OFFSET 0x00
23 static const struct of_device_id realview_soc_of_match[] = {
24 { .compatible = "arm,realview-eb-soc", },
25 { .compatible = "arm,realview-pb1176-soc", },
26 { .compatible = "arm,realview-pb11mp-soc", },
27 { .compatible = "arm,realview-pba8-soc", },
28 { .compatible = "arm,realview-pbx-soc", },
31 static u32 realview_coreid;
33 static const char *realview_board_str(u32 id)
35 switch ((id >> 16) & 0xfff) {
43 static const char *realview_arch_str(u32 id)
45 switch ((id >> 8) & 0xf) {
47 return "Multi-layer AXI";
53 static ssize_t realview_get_manf(struct device *dev,
54 struct device_attribute *attr,
57 return sprintf(buf, "%02x\n", realview_coreid >> 24);
60 static struct device_attribute realview_manf_attr =
61 __ATTR(manufacturer, S_IRUGO, realview_get_manf, NULL);
63 static ssize_t realview_get_board(struct device *dev,
64 struct device_attribute *attr,
67 return sprintf(buf, "%s\n", realview_board_str(realview_coreid));
70 static struct device_attribute realview_board_attr =
71 __ATTR(board, S_IRUGO, realview_get_board, NULL);
73 static ssize_t realview_get_arch(struct device *dev,
74 struct device_attribute *attr,
77 return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
80 static struct device_attribute realview_arch_attr =
81 __ATTR(fpga, S_IRUGO, realview_get_arch, NULL);
83 static ssize_t realview_get_build(struct device *dev,
84 struct device_attribute *attr,
87 return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
90 static struct device_attribute realview_build_attr =
91 __ATTR(build, S_IRUGO, realview_get_build, NULL);
93 static int realview_soc_probe(struct platform_device *pdev)
95 static struct regmap *syscon_regmap;
96 struct soc_device *soc_dev;
97 struct soc_device_attribute *soc_dev_attr;
98 struct device_node *np = pdev->dev.of_node;
101 syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap");
102 if (IS_ERR(syscon_regmap))
103 return PTR_ERR(syscon_regmap);
105 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
109 ret = of_property_read_string(np, "compatible",
110 &soc_dev_attr->soc_id);
114 soc_dev_attr->machine = "RealView";
115 soc_dev_attr->family = "Versatile";
116 soc_dev = soc_device_register(soc_dev_attr);
117 if (IS_ERR(soc_dev)) {
121 ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
126 device_create_file(soc_device_to_device(soc_dev), &realview_manf_attr);
127 device_create_file(soc_device_to_device(soc_dev), &realview_board_attr);
128 device_create_file(soc_device_to_device(soc_dev), &realview_arch_attr);
129 device_create_file(soc_device_to_device(soc_dev), &realview_build_attr);
131 dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x\n",
133 /* FIXME: add attributes for SoC to sysfs */
137 static struct platform_driver realview_soc_driver = {
138 .probe = realview_soc_probe,
140 .name = "realview-soc",
141 .of_match_table = realview_soc_of_match,
144 module_platform_driver(realview_soc_driver);