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) 2008-2011 Gabor Juhos <juhosg@openwrt.org> 7 * Copyright (C) 2008 Imre Kaloz <kaloz@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/rt288x.h> 19 20 #include "common.h" 21 22 static struct ralink_soc_info *soc_info_ptr; 23 24 void __init ralink_of_remap(void) 25 { 26 rt_sysc_membase = plat_of_remap_node("ralink,rt2880-sysc"); 27 rt_memc_membase = plat_of_remap_node("ralink,rt2880-memc"); 28 29 if (!rt_sysc_membase || !rt_memc_membase) 30 panic("Failed to remap core resources"); 31 } 32 33 static unsigned int __init rt2880_get_soc_name0(void) 34 { 35 return __raw_readl(RT2880_SYSC_BASE + SYSC_REG_CHIP_NAME0); 36 } 37 38 static unsigned int __init rt2880_get_soc_name1(void) 39 { 40 return __raw_readl(RT2880_SYSC_BASE + SYSC_REG_CHIP_NAME1); 41 } 42 43 static bool __init rt2880_soc_valid(void) 44 { 45 if (rt2880_get_soc_name0() == RT2880_CHIP_NAME0 && 46 rt2880_get_soc_name1() == RT2880_CHIP_NAME1) 47 return true; 48 else 49 return false; 50 } 51 52 static const char __init *rt2880_get_soc_name(void) 53 { 54 if (rt2880_soc_valid()) 55 return "RT2880"; 56 else 57 return "invalid"; 58 } 59 60 static unsigned int __init rt2880_get_soc_id(void) 61 { 62 return __raw_readl(RT2880_SYSC_BASE + SYSC_REG_CHIP_ID); 63 } 64 65 static unsigned int __init rt2880_get_soc_ver(void) 66 { 67 return (rt2880_get_soc_id() >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK; 68 } 69 70 static unsigned int __init rt2880_get_soc_rev(void) 71 { 72 return (rt2880_get_soc_id() & CHIP_ID_REV_MASK); 73 } 74 75 static int __init rt2880_soc_dev_init(void) 76 { 77 struct soc_device *soc_dev; 78 struct soc_device_attribute *soc_dev_attr; 79 80 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 81 if (!soc_dev_attr) 82 return -ENOMEM; 83 84 soc_dev_attr->family = "Ralink"; 85 soc_dev_attr->soc_id = rt2880_get_soc_name(); 86 87 soc_dev_attr->data = soc_info_ptr; 88 89 soc_dev = soc_device_register(soc_dev_attr); 90 if (IS_ERR(soc_dev)) { 91 kfree(soc_dev_attr); 92 return PTR_ERR(soc_dev); 93 } 94 95 return 0; 96 } 97 device_initcall(rt2880_soc_dev_init); 98 99 void __init prom_soc_init(struct ralink_soc_info *soc_info) 100 { 101 if (rt2880_soc_valid()) 102 soc_info->compatible = "ralink,r2880-soc"; 103 else 104 panic("rt288x: unknown SoC, n0:%08x n1:%08x", 105 rt2880_get_soc_name0(), rt2880_get_soc_name1()); 106 107 snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN, 108 "Ralink %s id:%u rev:%u", 109 rt2880_get_soc_name(), 110 rt2880_get_soc_ver(), 111 rt2880_get_soc_rev()); 112 113 soc_info->mem_base = RT2880_SDRAM_BASE; 114 soc_info->mem_size_min = RT2880_MEM_SIZE_MIN; 115 soc_info->mem_size_max = RT2880_MEM_SIZE_MAX; 116 117 ralink_soc = RT2880_SOC; 118 soc_info_ptr = soc_info; 119 } 120