arch/mips/ath79/setup.c

   1 /*
   2  *  Atheros AR71XX/AR724X/AR913X specific setup
   3  *
   4  *  Copyright (C) 2008-2011 Gabor Juhos <[email protected]>
   5  *  Copyright (C) 2008 Imre Kaloz <[email protected]>
   6  *
   7  *  Parts of this file are based on Atheros' 2.6.15 BSP
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/err.h>
  18 #include <linux/clk.h>
  19
  20 #include <asm/bootinfo.h>
  21 #include <asm/time.h>           /* for mips_hpt_frequency */
  22 #include <asm/reboot.h>         /* for _machine_{restart,halt} */
  23 #include <asm/mips_machine.h>
  24
  25 #include <asm/mach-ath79/ath79.h>
  26 #include <asm/mach-ath79/ar71xx_regs.h>
  27 #include "common.h"
  28 #include "dev-common.h"
  29 #include "machtypes.h"
  30
  31 #define ATH79_SYS_TYPE_LEN      64
  32
  33 #define AR71XX_BASE_FREQ        40000000
  34 #define AR724X_BASE_FREQ        5000000
  35 #define AR913X_BASE_FREQ        5000000
  36
  37 static char ath79_sys_type[ATH79_SYS_TYPE_LEN];
  38
  39 static void ath79_restart(char *command)
  40 {
  41         ath79_device_reset_set(AR71XX_RESET_FULL_CHIP);
  42         for (;;)
  43                 if (cpu_wait)
  44                         cpu_wait();
  45 }
  46
  47 static void ath79_halt(void)
  48 {
  49         while (1)
  50                 cpu_wait();
  51 }
  52
  53 static void __init ath79_detect_mem_size(void)
  54 {
  55         unsigned long size;
  56
  57         for (size = ATH79_MEM_SIZE_MIN; size < ATH79_MEM_SIZE_MAX;
  58              size <<= 1) {
  59                 if (!memcmp(ath79_detect_mem_size,
  60                             ath79_detect_mem_size + size, 1024))
  61                         break;
  62         }
  63
  64         add_memory_region(0, size, BOOT_MEM_RAM);
  65 }
  66
  67 static void __init ath79_detect_sys_type(void)
  68 {
  69         char *chip = "????";
  70         u32 id;
  71         u32 major;
  72         u32 minor;
  73         u32 rev = 0;
  74
  75         id = ath79_reset_rr(AR71XX_RESET_REG_REV_ID);
  76         major = id & REV_ID_MAJOR_MASK;
  77
  78         switch (major) {
  79         case REV_ID_MAJOR_AR71XX:
  80                 minor = id & AR71XX_REV_ID_MINOR_MASK;
  81                 rev = id >> AR71XX_REV_ID_REVISION_SHIFT;
  82                 rev &= AR71XX_REV_ID_REVISION_MASK;
  83                 switch (minor) {
  84                 case AR71XX_REV_ID_MINOR_AR7130:
  85                         ath79_soc = ATH79_SOC_AR7130;
  86                         chip = "7130";
  87                         break;
  88
  89                 case AR71XX_REV_ID_MINOR_AR7141:
  90                         ath79_soc = ATH79_SOC_AR7141;
  91                         chip = "7141";
  92                         break;
  93
  94                 case AR71XX_REV_ID_MINOR_AR7161:
  95                         ath79_soc = ATH79_SOC_AR7161;
  96                         chip = "7161";
  97                         break;
  98                 }
  99                 break;
 100
 101         case REV_ID_MAJOR_AR7240:
 102                 ath79_soc = ATH79_SOC_AR7240;
 103                 chip = "7240";
 104                 rev = (id & AR724X_REV_ID_REVISION_MASK);
 105                 break;
 106
 107         case REV_ID_MAJOR_AR7241:
 108                 ath79_soc = ATH79_SOC_AR7241;
 109                 chip = "7241";
 110                 rev = (id & AR724X_REV_ID_REVISION_MASK);
 111                 break;
 112
 113         case REV_ID_MAJOR_AR7242:
 114                 ath79_soc = ATH79_SOC_AR7242;
 115                 chip = "7242";
 116                 rev = (id & AR724X_REV_ID_REVISION_MASK);
 117                 break;
 118
 119         case REV_ID_MAJOR_AR913X:
 120                 minor = id & AR913X_REV_ID_MINOR_MASK;
 121                 rev = id >> AR913X_REV_ID_REVISION_SHIFT;
 122                 rev &= AR913X_REV_ID_REVISION_MASK;
 123                 switch (minor) {
 124                 case AR913X_REV_ID_MINOR_AR9130:
 125                         ath79_soc = ATH79_SOC_AR9130;
 126                         chip = "9130";
 127                         break;
 128
 129                 case AR913X_REV_ID_MINOR_AR9132:
 130                         ath79_soc = ATH79_SOC_AR9132;
 131                         chip = "9132";
 132                         break;
 133                 }
 134                 break;
 135
 136         default:
 137                 panic("ath79: unknown SoC, id:0x%08x\n", id);
 138         }
 139
 140         sprintf(ath79_sys_type, "Atheros AR%s rev %u", chip, rev);
 141         pr_info("SoC: %s\n", ath79_sys_type);
 142 }
 143
 144 const char *get_system_type(void)
 145 {
 146         return ath79_sys_type;
 147 }
 148
 149 unsigned int __cpuinit get_c0_compare_int(void)
 150 {
 151         return CP0_LEGACY_COMPARE_IRQ;
 152 }
 153
 154 void __init plat_mem_setup(void)
 155 {
 156         set_io_port_base(KSEG1);
 157
 158         ath79_reset_base = ioremap_nocache(AR71XX_RESET_BASE,
 159                                            AR71XX_RESET_SIZE);
 160         ath79_pll_base = ioremap_nocache(AR71XX_PLL_BASE,
 161                                          AR71XX_PLL_SIZE);
 162         ath79_ddr_base = ioremap_nocache(AR71XX_DDR_CTRL_BASE,
 163                                          AR71XX_DDR_CTRL_SIZE);
 164
 165         ath79_detect_sys_type();
 166         ath79_detect_mem_size();
 167         ath79_clocks_init();
 168
 169         _machine_restart = ath79_restart;
 170         _machine_halt = ath79_halt;
 171         pm_power_off = ath79_halt;
 172 }
 173
 174 void __init plat_time_init(void)
 175 {
 176         struct clk *clk;
 177
 178         clk = clk_get(NULL, "cpu");
 179         if (IS_ERR(clk))
 180                 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
 181
 182         mips_hpt_frequency = clk_get_rate(clk) / 2;
 183 }
 184
 185 static int __init ath79_setup(void)
 186 {
 187         ath79_gpio_init();
 188         ath79_register_uart();
 189         ath79_register_wdt();
 190
 191         mips_machine_setup();
 192
 193         return 0;
 194 }
 195
 196 arch_initcall(ath79_setup);
 197
 198 static void __init ath79_generic_init(void)
 199 {
 200         /* Nothing to do */
 201 }
 202
 203 MIPS_MACHINE(ATH79_MACH_GENERIC,
 204              "Generic",
 205              "Generic AR71XX/AR724X/AR913X based board",
 206              ath79_generic_init);