| /* |
| * Copyright (C) 2014 Linaro Ltd. |
| * |
| * Author: Linus Walleij <linus.walleij@linaro.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2, as |
| * published by the Free Software Foundation. |
| * |
| */ |
| #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) |
| { |
| static 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); |