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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) ST-Ericsson SA 20104 *5 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson6 */7 8#include <linux/kernel.h>9#include <linux/init.h>10#include <linux/io.h>11#include <linux/module.h>12#include <linux/random.h>13#include <linux/slab.h>14#include <linux/of.h>15#include <linux/of_address.h>16#include <linux/sys_soc.h>17 18#include <asm/cputype.h>19#include <asm/tlbflush.h>20#include <asm/cacheflush.h>21#include <asm/mach/map.h>22 23/**24 * struct dbx500_asic_id - fields of the ASIC ID25 * @process: the manufacturing process, 0x40 is 40 nm 0x00 is "standard"26 * @partnumber: hithereto 0x8500 for DB850027 * @revision: version code in the series28 */29struct dbx500_asic_id {30 u16 partnumber;31 u8 revision;32 u8 process;33};34 35static struct dbx500_asic_id dbx500_id;36 37static unsigned int __init ux500_read_asicid(phys_addr_t addr)38{39 void __iomem *virt = ioremap(addr, 4);40 unsigned int asicid;41 42 if (!virt)43 return 0;44 45 asicid = readl(virt);46 iounmap(virt);47 48 return asicid;49}50 51static void ux500_print_soc_info(unsigned int asicid)52{53 unsigned int rev = dbx500_id.revision;54 55 pr_info("DB%4x ", dbx500_id.partnumber);56 57 if (rev == 0x01)58 pr_cont("Early Drop");59 else if (rev >= 0xA0)60 pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);61 else62 pr_cont("Unknown");63 64 pr_cont(" [%#010x]\n", asicid);65}66 67static unsigned int partnumber(unsigned int asicid)68{69 return (asicid >> 8) & 0xffff;70}71 72/*73 * SOC MIDR ASICID ADDRESS ASICID VALUE74 * DB8500ed 0x410fc090 0x9001FFF4 0x0085000175 * DB8500v1 0x411fc091 0x9001FFF4 0x008500A076 * DB8500v1.1 0x411fc091 0x9001FFF4 0x008500A177 * DB8500v2 0x412fc091 0x9001DBF4 0x008500B078 * DB8520v2.2 0x412fc091 0x9001DBF4 0x008500B279 * DB5500v1 0x412fc091 0x9001FFF4 0x005500A080 * DB9540 0x413fc090 0xFFFFDBF4 0x009540xx81 */82 83static void __init ux500_setup_id(void)84{85 unsigned int cpuid = read_cpuid_id();86 unsigned int asicid = 0;87 phys_addr_t addr = 0;88 89 switch (cpuid) {90 case 0x410fc090: /* DB8500ed */91 case 0x411fc091: /* DB8500v1 */92 addr = 0x9001FFF4;93 break;94 95 case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */96 asicid = ux500_read_asicid(0x9001DBF4);97 if (partnumber(asicid) == 0x8500 ||98 partnumber(asicid) == 0x8520)99 /* DB8500v2 */100 break;101 102 /* DB5500v1 */103 addr = 0x9001FFF4;104 break;105 106 case 0x413fc090: /* DB9540 */107 addr = 0xFFFFDBF4;108 break;109 }110 111 if (addr)112 asicid = ux500_read_asicid(addr);113 114 if (!asicid) {115 pr_err("Unable to identify SoC\n");116 BUG();117 }118 119 dbx500_id.process = asicid >> 24;120 dbx500_id.partnumber = partnumber(asicid);121 dbx500_id.revision = asicid & 0xff;122 123 ux500_print_soc_info(asicid);124}125 126static const char * __init ux500_get_machine(void)127{128 return kasprintf(GFP_KERNEL, "DB%4x", dbx500_id.partnumber);129}130 131static const char * __init ux500_get_family(void)132{133 return kasprintf(GFP_KERNEL, "ux500");134}135 136static const char * __init ux500_get_revision(void)137{138 unsigned int rev = dbx500_id.revision;139 140 if (rev == 0x01)141 return kasprintf(GFP_KERNEL, "%s", "ED");142 else if (rev >= 0xA0)143 return kasprintf(GFP_KERNEL, "%d.%d",144 (rev >> 4) - 0xA + 1, rev & 0xf);145 146 return kasprintf(GFP_KERNEL, "%s", "Unknown");147}148 149static ssize_t150process_show(struct device *dev, struct device_attribute *attr, char *buf)151{152 if (dbx500_id.process == 0x00)153 return sprintf(buf, "Standard\n");154 155 return sprintf(buf, "%02xnm\n", dbx500_id.process);156}157 158static DEVICE_ATTR_RO(process);159 160static struct attribute *ux500_soc_attrs[] = {161 &dev_attr_process.attr,162 NULL163};164 165ATTRIBUTE_GROUPS(ux500_soc);166 167static const char *db8500_read_soc_id(struct device_node *backupram)168{169 void __iomem *base;170 const char *retstr;171 u32 uid[5];172 173 base = of_iomap(backupram, 0);174 if (!base)175 return NULL;176 memcpy_fromio(uid, base + 0x1fc0, sizeof(uid));177 178 /* Throw these device-specific numbers into the entropy pool */179 add_device_randomness(uid, sizeof(uid));180 retstr = kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",181 uid[0], uid[1], uid[2], uid[3], uid[4]);182 iounmap(base);183 return retstr;184}185 186static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,187 struct device_node *backupram)188{189 soc_dev_attr->soc_id = db8500_read_soc_id(backupram);190 soc_dev_attr->machine = ux500_get_machine();191 soc_dev_attr->family = ux500_get_family();192 soc_dev_attr->revision = ux500_get_revision();193 soc_dev_attr->custom_attr_group = ux500_soc_groups[0];194}195 196static int __init ux500_soc_device_init(void)197{198 struct soc_device *soc_dev;199 struct soc_device_attribute *soc_dev_attr;200 struct device_node *backupram;201 202 backupram = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram");203 if (!backupram)204 return 0;205 206 ux500_setup_id();207 208 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);209 if (!soc_dev_attr) {210 of_node_put(backupram);211 return -ENOMEM;212 }213 214 soc_info_populate(soc_dev_attr, backupram);215 of_node_put(backupram);216 217 soc_dev = soc_device_register(soc_dev_attr);218 if (IS_ERR(soc_dev)) {219 kfree(soc_dev_attr);220 return PTR_ERR(soc_dev);221 }222 223 return 0;224}225subsys_initcall(ux500_soc_device_init);226