1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Parts of this file are based on Ralink's 2.6.21 BSP 5 * 6 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> 7 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org> 8 * Copyright (C) 2013 John Crispin <john@phrozen.org> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/slab.h> 14 #include <linux/sys_soc.h> 15 16 #include <asm/mipsregs.h> 17 #include <asm/mach-ralink/ralink_regs.h> 18 #include <asm/mach-ralink/rt3883.h> 19 20 #include "common.h" 21 22 static struct ralink_soc_info *soc_info_ptr; 23 24 static unsigned int __init rt3883_get_soc_name0(void) 25 { 26 return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID0_3); 27 } 28 29 static unsigned int __init rt3883_get_soc_name1(void) 30 { 31 return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID4_7); 32 } 33 34 static bool __init rt3883_soc_valid(void) 35 { 36 if (rt3883_get_soc_name0() == RT3883_CHIP_NAME0 && 37 rt3883_get_soc_name1() == RT3883_CHIP_NAME1) 38 return true; 39 else 40 return false; 41 } 42 43 static const char __init *rt3883_get_soc_name(void) 44 { 45 if (rt3883_soc_valid()) 46 return "RT3883"; 47 else 48 return "invalid"; 49 } 50 51 static unsigned int __init rt3883_get_soc_id(void) 52 { 53 return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_REVID); 54 } 55 56 static unsigned int __init rt3883_get_soc_ver(void) 57 { 58 return (rt3883_get_soc_id() >> RT3883_REVID_VER_ID_SHIFT) & RT3883_REVID_VER_ID_MASK; 59 } 60 61 static unsigned int __init rt3883_get_soc_rev(void) 62 { 63 return (rt3883_get_soc_id() & RT3883_REVID_ECO_ID_MASK); 64 } 65 66 static int __init rt3883_soc_dev_init(void) 67 { 68 struct soc_device *soc_dev; 69 struct soc_device_attribute *soc_dev_attr; 70 71 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 72 if (!soc_dev_attr) 73 return -ENOMEM; 74 75 soc_dev_attr->family = "Ralink"; 76 soc_dev_attr->soc_id = rt3883_get_soc_name(); 77 78 soc_dev_attr->data = soc_info_ptr; 79 80 soc_dev = soc_device_register(soc_dev_attr); 81 if (IS_ERR(soc_dev)) { 82 kfree(soc_dev_attr); 83 return PTR_ERR(soc_dev); 84 } 85 86 return 0; 87 } 88 device_initcall(rt3883_soc_dev_init); 89 90 void __init prom_soc_init(struct ralink_soc_info *soc_info) 91 { 92 if (rt3883_soc_valid()) 93 soc_info->compatible = "ralink,rt3883-soc"; 94 else 95 panic("rt3883: unknown SoC, n0:%08x n1:%08x", 96 rt3883_get_soc_name0(), rt3883_get_soc_name1()); 97 98 snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN, 99 "Ralink %s ver:%u eco:%u", 100 rt3883_get_soc_name(), 101 rt3883_get_soc_ver(), 102 rt3883_get_soc_rev()); 103 104 soc_info->mem_base = RT3883_SDRAM_BASE; 105 soc_info->mem_size_min = RT3883_MEM_SIZE_MIN; 106 soc_info->mem_size_max = RT3883_MEM_SIZE_MAX; 107 108 ralink_soc = RT3883_SOC; 109 soc_info_ptr = soc_info; 110 } 111