projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Copyright 2001 MontaVista Software Inc. | |
| 3 | * Author: jsun@mvista.com or jsun@junsun.net | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify it | |
| 6 | * under the terms of the GNU General Public License as published by the | |
| 7 | * Free Software Foundation; either version 2 of the License, or (at your | |
| 8 | * option) any later version. | |
| 9 | */ | |
| 10 | #include <linux/config.h> | |
| 11 | #include <linux/init.h> | |
| 12 | #include <linux/mm.h> | |
| 13 | #include <linux/sched.h> | |
| 14 | #include <linux/bootmem.h> | |
| 15 | ||
| 16 | #include <asm/addrspace.h> | |
| 17 | #include <asm/bootinfo.h> | |
| 18 | #include <asm/ddb5xxx/ddb5xxx.h> | |
| 19 | #include <asm/debug.h> | |
| 20 | ||
| 21 | const char *get_system_type(void) | |
| 22 | { | |
| 23 | switch (mips_machtype) { | |
| 1da177e4 LT |
24 | case MACH_NEC_DDB5477: return "NEC DDB Vrc-5477"; |
| 25 | case MACH_NEC_ROCKHOPPER: return "NEC Rockhopper"; | |
| 26 | case MACH_NEC_ROCKHOPPERII: return "NEC RockhopperII"; | |
| 27 | default: return "Unknown NEC board"; | |
| 28 | } | |
| 29 | } | |
| 30 | ||
| 31 | #if defined(CONFIG_DDB5477) | |
| 32 | void ddb5477_runtime_detection(void); | |
| 33 | #endif | |
| 34 | ||
| 35 | /* [jsun@junsun.net] PMON passes arguments in C main() style */ | |
| 36 | void __init prom_init(void) | |
| 37 | { | |
| 38 | int argc = fw_arg0; | |
| 39 | char **arg = (char**) fw_arg1; | |
| 40 | int i; | |
| 41 | ||
| 42 | /* if user passes kernel args, ignore the default one */ | |
| 43 | if (argc > 1) | |
| 44 | arcs_cmdline[0] = '\0'; | |
| 45 | ||
| 46 | /* arg[0] is "g", the rest is boot parameters */ | |
| 47 | for (i = 1; i < argc; i++) { | |
| 48 | if (strlen(arcs_cmdline) + strlen(arg[i] + 1) | |
| 49 | >= sizeof(arcs_cmdline)) | |
| 50 | break; | |
| 51 | strcat(arcs_cmdline, arg[i]); | |
| 52 | strcat(arcs_cmdline, " "); | |
| 53 | } | |
| 54 | ||
| 55 | mips_machgroup = MACH_GROUP_NEC_DDB; | |
| 56 | ||
| 470b1603 | 57 | #if defined(CONFIG_DDB5477) |
| 1da177e4 LT |
58 | ddb5477_runtime_detection(); |
| 59 | add_memory_region(0, board_ram_size, BOOT_MEM_RAM); | |
| 60 | #endif | |
| 61 | } | |
| 62 | ||
| 63 | unsigned long __init prom_free_prom_memory(void) | |
| 64 | { | |
| 65 | return 0; | |
| 66 | } | |
| 67 | ||
| 68 | #if defined(CONFIG_DDB5477) | |
| 69 | ||
| 70 | #define DEFAULT_LCS1_BASE 0x19000000 | |
| 71 | #define TESTVAL1 'K' | |
| 72 | #define TESTVAL2 'S' | |
| 73 | ||
| 74 | int board_ram_size; | |
| 75 | void ddb5477_runtime_detection(void) | |
| 76 | { | |
| 77 | volatile char *test_offset; | |
| 78 | char saved_test_byte; | |
| 79 | ||
| 80 | /* Determine if this is a DDB5477 board, or a BSB-VR0300 | |
| 81 | base board. We can tell by checking for the location of | |
| 82 | the NVRAM. It lives at the beginning of LCS1 on the DDB5477, | |
| 83 | and the beginning of LCS1 on the BSB-VR0300 is flash memory. | |
| 84 | The first 2K of the NVRAM are reserved, so don't we'll poke | |
| 85 | around just after that. | |
| 86 | */ | |
| 87 | ||
| 88 | /* We can only use the PCI bus to distinquish between | |
| 89 | the Rockhopper and RockhopperII backplanes and this must | |
| 90 | wait until ddb5477_board_init() in setup.c after the 5477 | |
| 91 | is initialized. So, until then handle | |
| 92 | both Rockhopper and RockhopperII backplanes as Rockhopper 1 | |
| 93 | */ | |
| 94 | ||
| 95 | test_offset = (char *)KSEG1ADDR(DEFAULT_LCS1_BASE + 0x800); | |
| 96 | saved_test_byte = *test_offset; | |
| 97 | ||
| 98 | *test_offset = TESTVAL1; | |
| 99 | if (*test_offset != TESTVAL1) { | |
| 100 | /* We couldn't set our test value, so it must not be NVRAM, | |
| 101 | so it's a BSB_VR0300 */ | |
| 102 | mips_machtype = MACH_NEC_ROCKHOPPER; | |
| 103 | } else { | |
| 104 | /* We may have gotten lucky, and the TESTVAL1 was already | |
| 105 | stored at the test location, so we must check a second | |
| 106 | test value */ | |
| 107 | *test_offset = TESTVAL2; | |
| 108 | if (*test_offset != TESTVAL2) { | |
| 109 | /* OK, we couldn't set this value either, so it must | |
| 110 | definately be a BSB_VR0300 */ | |
| 111 | mips_machtype = MACH_NEC_ROCKHOPPER; | |
| 112 | } else { | |
| 113 | /* We could change the value twice, so it must be | |
| 114 | NVRAM, so it's a DDB_VRC5477 */ | |
| 115 | mips_machtype = MACH_NEC_DDB5477; | |
| 116 | } | |
| 117 | } | |
| 118 | /* Restore the original byte */ | |
| 119 | *test_offset = saved_test_byte; | |
| 120 | ||
| 121 | /* before we know a better way, we will trust PMON for getting | |
| 122 | * RAM size | |
| 123 | */ | |
| 124 | board_ram_size = 1 << (36 - (ddb_in32(DDB_SDRAM0) & 0xf)); | |
| 125 | ||
| 126 | db_run(printk("DDB run-time detection : %s, %d MB RAM\n", | |
| 127 | mips_machtype == MACH_NEC_DDB5477 ? | |
| 128 | "DDB5477" : "Rockhopper", | |
| 129 | board_ram_size >> 20)); | |
| 130 | ||
| 131 | /* we can't handle ram size > 128 MB */ | |
| 132 | db_assert(board_ram_size <= (128 << 20)); | |
| 133 | } | |
| 134 | #endif |