arch/mips/ath25/board.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2003 Atheros Communications, Inc.,  All Rights Reserved.
   7  * Copyright (C) 2006 FON Technology, SL.
   8  * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
   9  * Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <asm/irq_cpu.h>
  15 #include <asm/reboot.h>
  16 #include <asm/bootinfo.h>
  17 #include <asm/time.h>
  18
  19 #include <ath25_platform.h>
  20 #include "devices.h"
  21 #include "ar5312.h"
  22 #include "ar2315.h"
  23
  24 void (*ath25_irq_dispatch)(void);
  25
  26 static inline bool check_radio_magic(const void __iomem *addr)
  27 {
  28         addr += 0x7a; /* offset for flash magic */
  29         return (__raw_readb(addr) == 0x5a) && (__raw_readb(addr + 1) == 0xa5);
  30 }
  31
  32 static inline bool check_notempty(const void __iomem *addr)
  33 {
  34         return __raw_readl(addr) != 0xffffffff;
  35 }
  36
  37 static inline bool check_board_data(const void __iomem *addr, bool broken)
  38 {
  39         /* config magic found */
  40         if (__raw_readl(addr) == ATH25_BD_MAGIC)
  41                 return true;
  42
  43         if (!broken)
  44                 return false;
  45
  46         /* broken board data detected, use radio data to find the
  47          * offset, user will fix this */
  48
  49         if (check_radio_magic(addr + 0x1000))
  50                 return true;
  51         if (check_radio_magic(addr + 0xf8))
  52                 return true;
  53
  54         return false;
  55 }
  56
  57 static const void __iomem * __init find_board_config(const void __iomem *limit,
  58                                                      const bool broken)
  59 {
  60         const void __iomem *addr;
  61         const void __iomem *begin = limit - 0x1000;
  62         const void __iomem *end = limit - 0x30000;
  63
  64         for (addr = begin; addr >= end; addr -= 0x1000)
  65                 if (check_board_data(addr, broken))
  66                         return addr;
  67
  68         return NULL;
  69 }
  70
  71 static const void __iomem * __init find_radio_config(const void __iomem *limit,
  72                                                      const void __iomem *bcfg)
  73 {
  74         const void __iomem *rcfg, *begin, *end;
  75
  76         /*
  77          * Now find the start of Radio Configuration data, using heuristics:
  78          * Search forward from Board Configuration data by 0x1000 bytes
  79          * at a time until we find non-0xffffffff.
  80          */
  81         begin = bcfg + 0x1000;
  82         end = limit;
  83         for (rcfg = begin; rcfg < end; rcfg += 0x1000)
  84                 if (check_notempty(rcfg) && check_radio_magic(rcfg))
  85                         return rcfg;
  86
  87         /* AR2316 relocates radio config to new location */
  88         begin = bcfg + 0xf8;
  89         end = limit - 0x1000 + 0xf8;
  90         for (rcfg = begin; rcfg < end; rcfg += 0x1000)
  91                 if (check_notempty(rcfg) && check_radio_magic(rcfg))
  92                         return rcfg;
  93
  94         return NULL;
  95 }
  96
  97 /*
  98  * NB: Search region size could be larger than the actual flash size,
  99  * but this shouldn't be a problem here, because the flash
 100  * will simply be mapped multiple times.
 101  */
 102 int __init ath25_find_config(phys_addr_t base, unsigned long size)
 103 {
 104         const void __iomem *flash_base, *flash_limit;
 105         struct ath25_boarddata *config;
 106         unsigned int rcfg_size;
 107         int broken_boarddata = 0;
 108         const void __iomem *bcfg, *rcfg;
 109         u8 *board_data;
 110         u8 *radio_data;
 111         u8 *mac_addr;
 112         u32 offset;
 113
 114         flash_base = ioremap_nocache(base, size);
 115         flash_limit = flash_base + size;
 116
 117         ath25_board.config = NULL;
 118         ath25_board.radio = NULL;
 119
 120         /* Copy the board and radio data to RAM, because accessing the mapped
 121          * memory of the flash directly after booting is not safe */
 122
 123         /* Try to find valid board and radio data */
 124         bcfg = find_board_config(flash_limit, false);
 125
 126         /* If that fails, try to at least find valid radio data */
 127         if (!bcfg) {
 128                 bcfg = find_board_config(flash_limit, true);
 129                 broken_boarddata = 1;
 130         }
 131
 132         if (!bcfg) {
 133                 pr_warn("WARNING: No board configuration data found!\n");
 134                 goto error;
 135         }
 136
 137         board_data = kzalloc(BOARD_CONFIG_BUFSZ, GFP_KERNEL);
 138         ath25_board.config = (struct ath25_boarddata *)board_data;
 139         memcpy_fromio(board_data, bcfg, 0x100);
 140         if (broken_boarddata) {
 141                 pr_warn("WARNING: broken board data detected\n");
 142                 config = ath25_board.config;
 143                 if (is_zero_ether_addr(config->enet0_mac)) {
 144                         pr_info("Fixing up empty mac addresses\n");
 145                         config->reset_config_gpio = 0xffff;
 146                         config->sys_led_gpio = 0xffff;
 147                         random_ether_addr(config->wlan0_mac);
 148                         config->wlan0_mac[0] &= ~0x06;
 149                         random_ether_addr(config->enet0_mac);
 150                         random_ether_addr(config->enet1_mac);
 151                 }
 152         }
 153
 154         /* Radio config starts 0x100 bytes after board config, regardless
 155          * of what the physical layout on the flash chip looks like */
 156
 157         rcfg = find_radio_config(flash_limit, bcfg);
 158         if (!rcfg) {
 159                 pr_warn("WARNING: Could not find Radio Configuration data\n");
 160                 goto error;
 161         }
 162
 163         radio_data = board_data + 0x100 + ((rcfg - bcfg) & 0xfff);
 164         ath25_board.radio = radio_data;
 165         offset = radio_data - board_data;
 166         pr_info("Radio config found at offset 0x%x (0x%x)\n", rcfg - bcfg,
 167                 offset);
 168         rcfg_size = BOARD_CONFIG_BUFSZ - offset;
 169         memcpy_fromio(radio_data, rcfg, rcfg_size);
 170
 171         mac_addr = &radio_data[0x1d * 2];
 172         if (is_broadcast_ether_addr(mac_addr)) {
 173                 pr_info("Radio MAC is blank; using board-data\n");
 174                 ether_addr_copy(mac_addr, ath25_board.config->wlan0_mac);
 175         }
 176
 177         iounmap(flash_base);
 178
 179         return 0;
 180
 181 error:
 182         iounmap(flash_base);
 183         return -ENODEV;
 184 }
 185
 186 static void ath25_halt(void)
 187 {
 188         local_irq_disable();
 189         unreachable();
 190 }
 191
 192 void __init plat_mem_setup(void)
 193 {
 194         _machine_halt = ath25_halt;
 195         pm_power_off = ath25_halt;
 196
 197         if (is_ar5312())
 198                 ar5312_plat_mem_setup();
 199         else
 200                 ar2315_plat_mem_setup();
 201
 202         /* Disable data watchpoints */
 203         write_c0_watchlo0(0);
 204 }
 205
 206 asmlinkage void plat_irq_dispatch(void)
 207 {
 208         ath25_irq_dispatch();
 209 }
 210
 211 void __init plat_time_init(void)
 212 {
 213         if (is_ar5312())
 214                 ar5312_plat_time_init();
 215         else
 216                 ar2315_plat_time_init();
 217 }
 218
 219 unsigned int get_c0_compare_int(void)
 220 {
 221         return CP0_LEGACY_COMPARE_IRQ;
 222 }
 223
 224 void __init arch_init_irq(void)
 225 {
 226         clear_c0_status(ST0_IM);
 227         mips_cpu_irq_init();
 228
 229         /* Initialize interrupt controllers */
 230         if (is_ar5312())
 231                 ar5312_arch_init_irq();
 232         else
 233                 ar2315_arch_init_irq();
 234 }