| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) ST-Ericsson SA 2010 |
| * |
| * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/random.h> |
| #include <linux/slab.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/sys_soc.h> |
| |
| #include <asm/cputype.h> |
| #include <asm/tlbflush.h> |
| #include <asm/cacheflush.h> |
| #include <asm/mach/map.h> |
| |
| /** |
| * struct dbx500_asic_id - fields of the ASIC ID |
| * @process: the manufacturing process, 0x40 is 40 nm 0x00 is "standard" |
| * @partnumber: hithereto 0x8500 for DB8500 |
| * @revision: version code in the series |
| */ |
| struct dbx500_asic_id { |
| u16 partnumber; |
| u8 revision; |
| u8 process; |
| }; |
| |
| static struct dbx500_asic_id dbx500_id; |
| |
| static unsigned int __init ux500_read_asicid(phys_addr_t addr) |
| { |
| void __iomem *virt = ioremap(addr, 4); |
| unsigned int asicid; |
| |
| if (!virt) |
| return 0; |
| |
| asicid = readl(virt); |
| iounmap(virt); |
| |
| return asicid; |
| } |
| |
| static void ux500_print_soc_info(unsigned int asicid) |
| { |
| unsigned int rev = dbx500_id.revision; |
| |
| pr_info("DB%4x ", dbx500_id.partnumber); |
| |
| if (rev == 0x01) |
| pr_cont("Early Drop"); |
| else if (rev >= 0xA0) |
| pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf); |
| else |
| pr_cont("Unknown"); |
| |
| pr_cont(" [%#010x]\n", asicid); |
| } |
| |
| static unsigned int partnumber(unsigned int asicid) |
| { |
| return (asicid >> 8) & 0xffff; |
| } |
| |
| /* |
| * SOC MIDR ASICID ADDRESS ASICID VALUE |
| * DB8500ed 0x410fc090 0x9001FFF4 0x00850001 |
| * DB8500v1 0x411fc091 0x9001FFF4 0x008500A0 |
| * DB8500v1.1 0x411fc091 0x9001FFF4 0x008500A1 |
| * DB8500v2 0x412fc091 0x9001DBF4 0x008500B0 |
| * DB8520v2.2 0x412fc091 0x9001DBF4 0x008500B2 |
| * DB5500v1 0x412fc091 0x9001FFF4 0x005500A0 |
| * DB9540 0x413fc090 0xFFFFDBF4 0x009540xx |
| */ |
| |
| static void __init ux500_setup_id(void) |
| { |
| unsigned int cpuid = read_cpuid_id(); |
| unsigned int asicid = 0; |
| phys_addr_t addr = 0; |
| |
| switch (cpuid) { |
| case 0x410fc090: /* DB8500ed */ |
| case 0x411fc091: /* DB8500v1 */ |
| addr = 0x9001FFF4; |
| break; |
| |
| case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */ |
| asicid = ux500_read_asicid(0x9001DBF4); |
| if (partnumber(asicid) == 0x8500 || |
| partnumber(asicid) == 0x8520) |
| /* DB8500v2 */ |
| break; |
| |
| /* DB5500v1 */ |
| addr = 0x9001FFF4; |
| break; |
| |
| case 0x413fc090: /* DB9540 */ |
| addr = 0xFFFFDBF4; |
| break; |
| } |
| |
| if (addr) |
| asicid = ux500_read_asicid(addr); |
| |
| if (!asicid) { |
| pr_err("Unable to identify SoC\n"); |
| BUG(); |
| } |
| |
| dbx500_id.process = asicid >> 24; |
| dbx500_id.partnumber = partnumber(asicid); |
| dbx500_id.revision = asicid & 0xff; |
| |
| ux500_print_soc_info(asicid); |
| } |
| |
| static const char * __init ux500_get_machine(void) |
| { |
| return kasprintf(GFP_KERNEL, "DB%4x", dbx500_id.partnumber); |
| } |
| |
| static const char * __init ux500_get_family(void) |
| { |
| return kasprintf(GFP_KERNEL, "ux500"); |
| } |
| |
| static const char * __init ux500_get_revision(void) |
| { |
| unsigned int rev = dbx500_id.revision; |
| |
| if (rev == 0x01) |
| return kasprintf(GFP_KERNEL, "%s", "ED"); |
| else if (rev >= 0xA0) |
| return kasprintf(GFP_KERNEL, "%d.%d", |
| (rev >> 4) - 0xA + 1, rev & 0xf); |
| |
| return kasprintf(GFP_KERNEL, "%s", "Unknown"); |
| } |
| |
| static ssize_t ux500_get_process(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| if (dbx500_id.process == 0x00) |
| return sprintf(buf, "Standard\n"); |
| |
| return sprintf(buf, "%02xnm\n", dbx500_id.process); |
| } |
| |
| static const char *db8500_read_soc_id(struct device_node *backupram) |
| { |
| void __iomem *base; |
| void __iomem *uid; |
| const char *retstr; |
| |
| base = of_iomap(backupram, 0); |
| if (!base) |
| return NULL; |
| uid = base + 0x1fc0; |
| |
| /* Throw these device-specific numbers into the entropy pool */ |
| add_device_randomness(uid, 0x14); |
| retstr = kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x", |
| readl((u32 *)uid+0), |
| readl((u32 *)uid+1), readl((u32 *)uid+2), |
| readl((u32 *)uid+3), readl((u32 *)uid+4)); |
| iounmap(base); |
| return retstr; |
| } |
| |
| static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr, |
| struct device_node *backupram) |
| { |
| soc_dev_attr->soc_id = db8500_read_soc_id(backupram); |
| soc_dev_attr->machine = ux500_get_machine(); |
| soc_dev_attr->family = ux500_get_family(); |
| soc_dev_attr->revision = ux500_get_revision(); |
| } |
| |
| static const struct device_attribute ux500_soc_attr = |
| __ATTR(process, S_IRUGO, ux500_get_process, NULL); |
| |
| static int __init ux500_soc_device_init(void) |
| { |
| struct device *parent; |
| struct soc_device *soc_dev; |
| struct soc_device_attribute *soc_dev_attr; |
| struct device_node *backupram; |
| |
| backupram = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram"); |
| if (!backupram) |
| return 0; |
| |
| ux500_setup_id(); |
| |
| soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); |
| if (!soc_dev_attr) |
| return -ENOMEM; |
| |
| soc_info_populate(soc_dev_attr, backupram); |
| |
| soc_dev = soc_device_register(soc_dev_attr); |
| if (IS_ERR(soc_dev)) { |
| kfree(soc_dev_attr); |
| return PTR_ERR(soc_dev); |
| } |
| |
| parent = soc_device_to_device(soc_dev); |
| device_create_file(parent, &ux500_soc_attr); |
| |
| return 0; |
| } |
| subsys_initcall(ux500_soc_device_init); |