arch/mips/ath79/setup.c

   1 /*
   2  *  Atheros AR71XX/AR724X/AR913X specific setup
   3  *
   4  *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
   5  *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
   6  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   7  *
   8  *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License version 2 as published
  12  *  by the Free Software Foundation.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/err.h>
  19 #include <linux/clk.h>
  20
  21 #include <asm/bootinfo.h>
  22 #include <asm/time.h>           /* for mips_hpt_frequency */
  23 #include <asm/reboot.h>         /* for _machine_{restart,halt} */
  24 #include <asm/mips_machine.h>
  25
  26 #include <asm/mach-ath79/ath79.h>
  27 #include <asm/mach-ath79/ar71xx_regs.h>
  28 #include "common.h"
  29 #include "dev-common.h"
  30 #include "machtypes.h"
  31
  32 #define ATH79_SYS_TYPE_LEN      64
  33
  34 #define AR71XX_BASE_FREQ        40000000
  35 #define AR724X_BASE_FREQ        5000000
  36 #define AR913X_BASE_FREQ        5000000
  37
  38 static char ath79_sys_type[ATH79_SYS_TYPE_LEN];
  39
  40 static void ath79_restart(char *command)
  41 {
  42         ath79_device_reset_set(AR71XX_RESET_FULL_CHIP);
  43         for (;;)
  44                 if (cpu_wait)
  45                         cpu_wait();
  46 }
  47
  48 static void ath79_halt(void)
  49 {
  50         while (1)
  51                 cpu_wait();
  52 }
  53
  54 static void __init ath79_detect_mem_size(void)
  55 {
  56         unsigned long size;
  57
  58         for (size = ATH79_MEM_SIZE_MIN; size < ATH79_MEM_SIZE_MAX;
  59              size <<= 1) {
  60                 if (!memcmp(ath79_detect_mem_size,
  61                             ath79_detect_mem_size + size, 1024))
  62                         break;
  63         }
  64
  65         add_memory_region(0, size, BOOT_MEM_RAM);
  66 }
  67
  68 static void __init ath79_detect_sys_type(void)
  69 {
  70         char *chip = "????";
  71         u32 id;
  72         u32 major;
  73         u32 minor;
  74         u32 rev = 0;
  75
  76         id = ath79_reset_rr(AR71XX_RESET_REG_REV_ID);
  77         major = id & REV_ID_MAJOR_MASK;
  78
  79         switch (major) {
  80         case REV_ID_MAJOR_AR71XX:
  81                 minor = id & AR71XX_REV_ID_MINOR_MASK;
  82                 rev = id >> AR71XX_REV_ID_REVISION_SHIFT;
  83                 rev &= AR71XX_REV_ID_REVISION_MASK;
  84                 switch (minor) {
  85                 case AR71XX_REV_ID_MINOR_AR7130:
  86                         ath79_soc = ATH79_SOC_AR7130;
  87                         chip = "7130";
  88                         break;
  89
  90                 case AR71XX_REV_ID_MINOR_AR7141:
  91                         ath79_soc = ATH79_SOC_AR7141;
  92                         chip = "7141";
  93                         break;
  94
  95                 case AR71XX_REV_ID_MINOR_AR7161:
  96                         ath79_soc = ATH79_SOC_AR7161;
  97                         chip = "7161";
  98                         break;
  99                 }
 100                 break;
 101
 102         case REV_ID_MAJOR_AR7240:
 103                 ath79_soc = ATH79_SOC_AR7240;
 104                 chip = "7240";
 105                 rev = id & AR724X_REV_ID_REVISION_MASK;
 106                 break;
 107
 108         case REV_ID_MAJOR_AR7241:
 109                 ath79_soc = ATH79_SOC_AR7241;
 110                 chip = "7241";
 111                 rev = id & AR724X_REV_ID_REVISION_MASK;
 112                 break;
 113
 114         case REV_ID_MAJOR_AR7242:
 115                 ath79_soc = ATH79_SOC_AR7242;
 116                 chip = "7242";
 117                 rev = id & AR724X_REV_ID_REVISION_MASK;
 118                 break;
 119
 120         case REV_ID_MAJOR_AR913X:
 121                 minor = id & AR913X_REV_ID_MINOR_MASK;
 122                 rev = id >> AR913X_REV_ID_REVISION_SHIFT;
 123                 rev &= AR913X_REV_ID_REVISION_MASK;
 124                 switch (minor) {
 125                 case AR913X_REV_ID_MINOR_AR9130:
 126                         ath79_soc = ATH79_SOC_AR9130;
 127                         chip = "9130";
 128                         break;
 129
 130                 case AR913X_REV_ID_MINOR_AR9132:
 131                         ath79_soc = ATH79_SOC_AR9132;
 132                         chip = "9132";
 133                         break;
 134                 }
 135                 break;
 136
 137         case REV_ID_MAJOR_AR9330:
 138                 ath79_soc = ATH79_SOC_AR9330;
 139                 chip = "9330";
 140                 rev = id & AR933X_REV_ID_REVISION_MASK;
 141                 break;
 142
 143         case REV_ID_MAJOR_AR9331:
 144                 ath79_soc = ATH79_SOC_AR9331;
 145                 chip = "9331";
 146                 rev = id & AR933X_REV_ID_REVISION_MASK;
 147                 break;
 148
 149         case REV_ID_MAJOR_AR9341:
 150                 ath79_soc = ATH79_SOC_AR9341;
 151                 chip = "9341";
 152                 rev = id & AR934X_REV_ID_REVISION_MASK;
 153                 break;
 154
 155         case REV_ID_MAJOR_AR9342:
 156                 ath79_soc = ATH79_SOC_AR9342;
 157                 chip = "9342";
 158                 rev = id & AR934X_REV_ID_REVISION_MASK;
 159                 break;
 160
 161         case REV_ID_MAJOR_AR9344:
 162                 ath79_soc = ATH79_SOC_AR9344;
 163                 chip = "9344";
 164                 rev = id & AR934X_REV_ID_REVISION_MASK;
 165                 break;
 166
 167         default:
 168                 panic("ath79: unknown SoC, id:0x%08x", id);
 169         }
 170
 171         ath79_soc_rev = rev;
 172
 173         sprintf(ath79_sys_type, "Atheros AR%s rev %u", chip, rev);
 174         pr_info("SoC: %s\n", ath79_sys_type);
 175 }
 176
 177 const char *get_system_type(void)
 178 {
 179         return ath79_sys_type;
 180 }
 181
 182 unsigned int __cpuinit get_c0_compare_int(void)
 183 {
 184         return CP0_LEGACY_COMPARE_IRQ;
 185 }
 186
 187 void __init plat_mem_setup(void)
 188 {
 189         set_io_port_base(KSEG1);
 190
 191         ath79_reset_base = ioremap_nocache(AR71XX_RESET_BASE,
 192                                            AR71XX_RESET_SIZE);
 193         ath79_pll_base = ioremap_nocache(AR71XX_PLL_BASE,
 194                                          AR71XX_PLL_SIZE);
 195         ath79_ddr_base = ioremap_nocache(AR71XX_DDR_CTRL_BASE,
 196                                          AR71XX_DDR_CTRL_SIZE);
 197
 198         ath79_detect_sys_type();
 199         ath79_detect_mem_size();
 200         ath79_clocks_init();
 201
 202         _machine_restart = ath79_restart;
 203         _machine_halt = ath79_halt;
 204         pm_power_off = ath79_halt;
 205 }
 206
 207 void __init plat_time_init(void)
 208 {
 209         struct clk *clk;
 210
 211         clk = clk_get(NULL, "cpu");
 212         if (IS_ERR(clk))
 213                 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
 214
 215         mips_hpt_frequency = clk_get_rate(clk) / 2;
 216 }
 217
 218 static int __init ath79_setup(void)
 219 {
 220         ath79_gpio_init();
 221         ath79_register_uart();
 222         ath79_register_wdt();
 223
 224         mips_machine_setup();
 225
 226         return 0;
 227 }
 228
 229 arch_initcall(ath79_setup);
 230
 231 static void __init ath79_generic_init(void)
 232 {
 233         /* Nothing to do */
 234 }
 235
 236 MIPS_MACHINE(ATH79_MACH_GENERIC,
 237              "Generic",
 238              "Generic AR71XX/AR724X/AR913X based board",
 239              ath79_generic_init);