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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2014 Linaro Ltd.4 *5 * Author: Linus Walleij <linus.walleij@linaro.org>6 */7#include <linux/init.h>8#include <linux/io.h>9#include <linux/slab.h>10#include <linux/sys_soc.h>11#include <linux/platform_device.h>12#include <linux/mfd/syscon.h>13#include <linux/regmap.h>14#include <linux/of.h>15 16#define INTEGRATOR_HDR_ID_OFFSET 0x0017 18static u32 integrator_coreid;19 20static const struct of_device_id integrator_cm_match[] = {21 { .compatible = "arm,core-module-integrator", },22 { }23};24 25static const char *integrator_arch_str(u32 id)26{27 switch ((id >> 16) & 0xff) {28 case 0x00:29 return "ASB little-endian";30 case 0x01:31 return "AHB little-endian";32 case 0x03:33 return "AHB-Lite system bus, bi-endian";34 case 0x04:35 return "AHB";36 case 0x08:37 return "AHB system bus, ASB processor bus";38 default:39 return "Unknown";40 }41}42 43static const char *integrator_fpga_str(u32 id)44{45 switch ((id >> 12) & 0xf) {46 case 0x01:47 return "XC4062";48 case 0x02:49 return "XC4085";50 case 0x03:51 return "XVC600";52 case 0x04:53 return "EPM7256AE (Altera PLD)";54 default:55 return "Unknown";56 }57}58 59static ssize_t60manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)61{62 return sprintf(buf, "%02x\n", integrator_coreid >> 24);63}64 65static DEVICE_ATTR_RO(manufacturer);66 67static ssize_t68arch_show(struct device *dev, struct device_attribute *attr, char *buf)69{70 return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));71}72 73static DEVICE_ATTR_RO(arch);74 75static ssize_t76fpga_show(struct device *dev, struct device_attribute *attr, char *buf)77{78 return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));79}80 81static DEVICE_ATTR_RO(fpga);82 83static ssize_t84build_show(struct device *dev, struct device_attribute *attr, char *buf)85{86 return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);87}88 89static DEVICE_ATTR_RO(build);90 91static struct attribute *integrator_attrs[] = {92 &dev_attr_manufacturer.attr,93 &dev_attr_arch.attr,94 &dev_attr_fpga.attr,95 &dev_attr_build.attr,96 NULL97};98 99ATTRIBUTE_GROUPS(integrator);100 101static int __init integrator_soc_init(void)102{103 struct regmap *syscon_regmap;104 struct soc_device *soc_dev;105 struct soc_device_attribute *soc_dev_attr;106 struct device_node *np;107 struct device *dev;108 u32 val;109 int ret;110 111 np = of_find_matching_node(NULL, integrator_cm_match);112 if (!np)113 return -ENODEV;114 115 syscon_regmap = syscon_node_to_regmap(np);116 of_node_put(np);117 if (IS_ERR(syscon_regmap))118 return PTR_ERR(syscon_regmap);119 120 ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,121 &val);122 if (ret)123 return -ENODEV;124 integrator_coreid = val;125 126 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);127 if (!soc_dev_attr)128 return -ENOMEM;129 130 soc_dev_attr->soc_id = "Integrator";131 soc_dev_attr->machine = "Integrator";132 soc_dev_attr->family = "Versatile";133 soc_dev_attr->custom_attr_group = integrator_groups[0];134 soc_dev = soc_device_register(soc_dev_attr);135 if (IS_ERR(soc_dev)) {136 kfree(soc_dev_attr);137 return -ENODEV;138 }139 dev = soc_device_to_device(soc_dev);140 141 dev_info(dev, "Detected ARM core module:\n");142 dev_info(dev, " Manufacturer: %02x\n", (val >> 24));143 dev_info(dev, " Architecture: %s\n", integrator_arch_str(val));144 dev_info(dev, " FPGA: %s\n", integrator_fpga_str(val));145 dev_info(dev, " Build: %02x\n", (val >> 4) & 0xFF);146 dev_info(dev, " Rev: %c\n", ('A' + (val & 0x03)));147 148 return 0;149}150device_initcall(integrator_soc_init);151