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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | // 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); |