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 14 #include <asm/mipsregs.h> 15 #include <asm/mach-ralink/ralink_regs.h> 16 #include <asm/mach-ralink/rt3883.h> 17 18 #include "common.h" 19 20 void __init ralink_clk_init(void) 21 { 22 unsigned long cpu_rate, sys_rate; 23 u32 syscfg0; 24 u32 clksel; 25 u32 ddr2; 26 27 syscfg0 = rt_sysc_r32(RT3883_SYSC_REG_SYSCFG0); 28 clksel = ((syscfg0 >> RT3883_SYSCFG0_CPUCLK_SHIFT) & 29 RT3883_SYSCFG0_CPUCLK_MASK); 30 ddr2 = syscfg0 & RT3883_SYSCFG0_DRAM_TYPE_DDR2; 31 32 switch (clksel) { 33 case RT3883_SYSCFG0_CPUCLK_250: 34 cpu_rate = 250000000; 35 sys_rate = (ddr2) ? 125000000 : 83000000; 36 break; 37 case RT3883_SYSCFG0_CPUCLK_384: 38 cpu_rate = 384000000; 39 sys_rate = (ddr2) ? 128000000 : 96000000; 40 break; 41 case RT3883_SYSCFG0_CPUCLK_480: 42 cpu_rate = 480000000; 43 sys_rate = (ddr2) ? 160000000 : 120000000; 44 break; 45 case RT3883_SYSCFG0_CPUCLK_500: 46 cpu_rate = 500000000; 47 sys_rate = (ddr2) ? 166000000 : 125000000; 48 break; 49 } 50 51 ralink_clk_add("cpu", cpu_rate); 52 ralink_clk_add("10000100.timer", sys_rate); 53 ralink_clk_add("10000120.watchdog", sys_rate); 54 ralink_clk_add("10000500.uart", 40000000); 55 ralink_clk_add("10000900.i2c", 40000000); 56 ralink_clk_add("10000a00.i2s", 40000000); 57 ralink_clk_add("10000b00.spi", sys_rate); 58 ralink_clk_add("10000b40.spi", sys_rate); 59 ralink_clk_add("10000c00.uartlite", 40000000); 60 ralink_clk_add("10100000.ethernet", sys_rate); 61 ralink_clk_add("10180000.wmac", 40000000); 62 } 63 64 void __init ralink_of_remap(void) 65 { 66 rt_sysc_membase = plat_of_remap_node("ralink,rt3883-sysc"); 67 rt_memc_membase = plat_of_remap_node("ralink,rt3883-memc"); 68 69 if (!rt_sysc_membase || !rt_memc_membase) 70 panic("Failed to remap core resources"); 71 } 72 73 static unsigned int __init rt3883_get_soc_name0(void) 74 { 75 return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID0_3); 76 } 77 78 static unsigned int __init rt3883_get_soc_name1(void) 79 { 80 return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID4_7); 81 } 82 83 static bool __init rt3883_soc_valid(void) 84 { 85 if (rt3883_get_soc_name0() == RT3883_CHIP_NAME0 && 86 rt3883_get_soc_name1() == RT3883_CHIP_NAME1) 87 return true; 88 else 89 return false; 90 } 91 92 static const char __init *rt3883_get_soc_name(void) 93 { 94 if (rt3883_soc_valid()) 95 return "RT3883"; 96 else 97 return "invalid"; 98 } 99 100 static unsigned int __init rt3883_get_soc_id(void) 101 { 102 return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_REVID); 103 } 104 105 static unsigned int __init rt3883_get_soc_ver(void) 106 { 107 return (rt3883_get_soc_id() >> RT3883_REVID_VER_ID_SHIFT) & RT3883_REVID_VER_ID_MASK; 108 } 109 110 static unsigned int __init rt3883_get_soc_rev(void) 111 { 112 return (rt3883_get_soc_id() & RT3883_REVID_ECO_ID_MASK); 113 } 114 115 void __init prom_soc_init(struct ralink_soc_info *soc_info) 116 { 117 if (rt3883_soc_valid()) 118 soc_info->compatible = "ralink,rt3883-soc"; 119 else 120 panic("rt3883: unknown SoC, n0:%08x n1:%08x", 121 rt3883_get_soc_name0(), rt3883_get_soc_name1()); 122 123 snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN, 124 "Ralink %s ver:%u eco:%u", 125 rt3883_get_soc_name(), 126 rt3883_get_soc_ver(), 127 rt3883_get_soc_rev()); 128 129 soc_info->mem_base = RT3883_SDRAM_BASE; 130 soc_info->mem_size_min = RT3883_MEM_SIZE_MIN; 131 soc_info->mem_size_max = RT3883_MEM_SIZE_MAX; 132 133 ralink_soc = RT3883_SOC; 134 } 135