arch/arm/kernel/arch.c

   1 /*
   2  * linux/arch/arm/kernel/arch.c
   3  *
   4  * Architecture specifics
   5  */
   6 #include <linux/tty.h>
   7 #include <linux/init.h>
   8
   9 #include <asm/elf.h>
  10 #include <asm/setup.h>
  11 #include <asm/system.h>
  12
  13 #include "arch.h"
  14
  15 extern unsigned int system_rev;
  16 extern unsigned int system_serial_low;
  17 extern unsigned int system_serial_high;
  18
  19 unsigned int vram_size;
  20 #ifdef CONFIG_ARCH_ACORN
  21 unsigned int memc_ctrl_reg;
  22 unsigned int number_mfm_drives;
  23 #endif
  24
  25 /*
  26  * Architecture specific fixups.  This is where any
  27  * parameters in the params struct are fixed up, or
  28  * any additional architecture specific information
  29  * is pulled from the params struct.
  30  */
  31 static void __init
  32 fixup_acorn(struct machine_desc *desc, struct param_struct *params,
  33             char **cmdline, struct meminfo *mi)
  34 {
  35 #ifdef CONFIG_ARCH_ACORN
  36         int i;
  37
  38         if (machine_is_riscpc()) {
  39                 /*
  40                  * RiscPC can't handle half-word loads and stores
  41                  */
  42                 elf_hwcap &= ~HWCAP_HALF;
  43
  44                 switch (params->u1.s.pages_in_vram) {
  45                 case 512:
  46                         vram_size += PAGE_SIZE * 256;
  47                 case 256:
  48                         vram_size += PAGE_SIZE * 256;
  49                 default:
  50                         break;
  51                 }
  52
  53                 if (vram_size) {
  54                         desc->video_start = 0x02000000;
  55                         desc->video_end   = 0x02000000 + vram_size;
  56                 }
  57
  58                 for (i = 0; i < 4; i++) {
  59                         mi->bank[i].start = PHYS_OFFSET + (i << 26);
  60                         mi->bank[i].size  =
  61                                 params->u1.s.pages_in_bank[i] *
  62                                 params->u1.s.page_size;
  63                 }
  64                 mi->nr_banks = 4;
  65         }
  66         memc_ctrl_reg     = params->u1.s.memc_control_reg;
  67         number_mfm_drives = (params->u1.s.adfsdrives >> 3) & 3;
  68 #endif
  69 }
  70
  71 static void __init
  72 fixup_ebsa285(struct machine_desc *desc, struct param_struct *params,
  73               char **cmdline, struct meminfo *mi)
  74 {
  75         ORIG_X           = params->u1.s.video_x;
  76         ORIG_Y           = params->u1.s.video_y;
  77         ORIG_VIDEO_COLS  = params->u1.s.video_num_cols;
  78         ORIG_VIDEO_LINES = params->u1.s.video_num_rows;
  79 }
  80
  81 /*
  82  * Older NeTTroms either do not provide a parameters
  83  * page, or they don't supply correct information in
  84  * the parameter page.
  85  */
  86 static void __init
  87 fixup_netwinder(struct machine_desc *desc, struct param_struct *params,
  88                 char **cmdline, struct meminfo *mi)
  89 {
  90         if (params->u1.s.nr_pages != 0x2000 &&
  91             params->u1.s.nr_pages != 0x4000) {
  92                 printk(KERN_WARNING "Warning: bad NeTTrom parameters "
  93                        "detected, using defaults\n");
  94
  95                 params->u1.s.nr_pages = 0x2000; /* 32MB */
  96                 params->u1.s.ramdisk_size = 0;
  97                 params->u1.s.flags = FLAG_READONLY;
  98                 params->u1.s.initrd_start = 0;
  99                 params->u1.s.initrd_size = 0;
 100                 params->u1.s.rd_start = 0;
 101         }
 102 }
 103
 104 /*
 105  * CATS uses soft-reboot by default, since
 106  * hard reboots fail on early boards.
 107  */
 108 static void __init
 109 fixup_cats(struct machine_desc *desc, struct param_struct *params,
 110            char **cmdline, struct meminfo *mi)
 111 {
 112         ORIG_VIDEO_LINES  = 25;
 113         ORIG_VIDEO_POINTS = 16;
 114         ORIG_Y = 24;
 115 }
 116
 117 static void __init
 118 fixup_coebsa285(struct machine_desc *desc, struct param_struct *params,
 119                 char **cmdline, struct meminfo *mi)
 120 {
 121 #if 0
 122         extern unsigned long boot_memory_end;
 123         extern char boot_command_line[];
 124
 125         mi->nr_banks      = 1;
 126         mi->bank[0].start = PHYS_OFFSET;
 127         mi->bank[0].size  = boot_memory_end;
 128
 129         *cmdline = boot_command_line;
 130 #endif
 131 }
 132
 133 static void __init
 134 fixup_sa1100(struct machine_desc *desc, struct param_struct *params,
 135              char **cmdline, struct meminfo *mi)
 136 {
 137 #ifdef CONFIG_ARCH_SA1100
 138         int i;
 139         extern struct mem_desc {
 140                 unsigned long phys_start;
 141                 unsigned long length;
 142         } mem_desc[];
 143         extern unsigned int mem_desc_size;
 144
 145         for( i = 0; i < mem_desc_size; i++ ) {
 146                 if( i >= NR_BANKS ) {
 147                         printk( __FUNCTION__
 148                                 ": mem_desc too large for meminfo structure\n");
 149                         break;
 150                 }
 151                 mi->bank[i].start = mem_desc[i].phys_start;
 152                 mi->bank[i].size = mem_desc[i].length;
 153         }
 154         mi->nr_banks = i;
 155
 156 #if defined(CONFIG_SA1100_BRUTUS)
 157         ROOT_DEV = MKDEV(RAMDISK_MAJOR,0);
 158         setup_ramdisk( 1, 0, 0, 8192 );
 159         setup_initrd( __phys_to_virt(0xd8000000), 0x00400000 );
 160 #elif defined(CONFIG_SA1100_EMPEG)
 161         ROOT_DEV = MKDEV( 3, 1 );  /* /dev/hda1 */
 162         setup_ramdisk( 1, 0, 0, 4096 );
 163         setup_initrd( 0xd0000000+((1024-320)*1024), (320*1024) );
 164 #elif defined(CONFIG_SA1100_TIFON)
 165         ROOT_DEV = MKDEV(UNNAMED_MAJOR, 0);
 166         setup_ramdisk(1, 0, 0, 4096);
 167         setup_initrd( 0xd0000000 + 0x1100004, 0x140000 );
 168 #elif defined(CONFIG_SA1100_VICTOR)
 169         ROOT_DEV = MKDEV( 60, 2 );
 170
 171         /* Get command line parameters passed from the loader (if any) */
 172         if( *((char*)0xc0000000) )
 173                 strcpy( default_command_line, ((char *)0xc0000000) );
 174
 175         /* power off if any problem */
 176         strcat( default_command_line, " panic=1" );
 177 #elif defined(CONFIG_SA1100_LART)
 178         ROOT_DEV = MKDEV(RAMDISK_MAJOR,0);
 179         setup_ramdisk(1, 0, 0, 8192);
 180         setup_initrd(0xc0400000, 0x00400000);
 181 #endif
 182 #endif
 183 }
 184
 185 #define NO_PARAMS       0
 186 #define NO_VIDEO        0, 0
 187
 188 /*
 189  * This is the list of all architectures supported by
 190  * this kernel.  This should be integrated with the list
 191  * in head-armv.S.
 192  */
 193 static struct machine_desc machine_desc[] __attribute__ ((__section__ (".arch.info"))) = {
 194         {
 195                 MACH_TYPE_EBSA110,
 196                 "EBSA110",      /* RMK                  */
 197                 0x00000400,
 198                 NO_VIDEO,
 199                 1, 0, 1, 1, 1,
 200                 NULL
 201         }, {
 202                 MACH_TYPE_RISCPC,
 203                 "Acorn-RiscPC", /* RMK                  */
 204                 0x10000100,
 205                 NO_VIDEO,
 206                 1, 1, 0, 0, 0,
 207                 fixup_acorn
 208         }, {
 209                 2,
 210                 "unknown",
 211                 NO_PARAMS,
 212                 NO_VIDEO,
 213                 0, 0, 0, 0, 0,
 214                 NULL
 215         }, {
 216                 MACH_TYPE_NEXUSPCI,
 217                 "FTV/PCI",      /* Philip Blundell      */
 218                 NO_PARAMS,
 219                 NO_VIDEO,
 220                 0, 0, 0, 0, 0,
 221                 NULL
 222         }, {
 223                 MACH_TYPE_EBSA285,
 224                 "EBSA285",              /* RMK                  */
 225                 0x00000100,
 226                 0x000a0000, 0x000bffff,
 227                 0, 0, 0, 0, 0,
 228                 fixup_ebsa285
 229         }, {
 230                 MACH_TYPE_NETWINDER,
 231                 "Rebel-NetWinder",      /* RMK                  */
 232                 0x00000100,
 233                 0x000a0000, 0x000bffff,
 234                 1, 0, 1, 0, 0,
 235                 fixup_netwinder
 236         }, {
 237                 MACH_TYPE_CATS,
 238                 "Chalice-CATS", /* Philip Blundell      */
 239                 NO_PARAMS,
 240                 0x000a0000, 0x000bffff,
 241                 0, 0, 0, 0, 1,
 242                 fixup_cats
 243         }, {
 244                 MACH_TYPE_TBOX,
 245                 "unknown-TBOX", /* Philip Blundell      */
 246                 NO_PARAMS,
 247                 NO_VIDEO,
 248                 0, 0, 0, 0, 0,
 249                 NULL
 250         }, {
 251                 MACH_TYPE_CO285,
 252                 "co-EBSA285",   /* Mark van Doesburg    */
 253                 NO_PARAMS,
 254                 NO_VIDEO,
 255                 0, 0, 0, 0, 0,
 256                 fixup_coebsa285
 257         }, {
 258                 MACH_TYPE_CLPS7110,
 259                 "CL-PS7110",    /* Werner Almesberger   */
 260                 NO_PARAMS,
 261                 NO_VIDEO,
 262                 0, 0, 0, 0, 0,
 263                 NULL
 264         }, {
 265                 MACH_TYPE_ARCHIMEDES,
 266                 "Acorn-Archimedes",/* RMK/DAG           */
 267                 0x0207c000,
 268                 NO_VIDEO,
 269                 0, 0, 0, 0, 0,
 270                 fixup_acorn
 271         }, {
 272                 MACH_TYPE_A5K,
 273                 "Acorn-A5000",  /* RMK/PB               */
 274                 0x0207c000,
 275                 NO_VIDEO,
 276                 0, 0, 0, 0, 0,
 277                 fixup_acorn
 278         }, {
 279                 MACH_TYPE_ETOILE,
 280                 "Etoile",               /* Alex de Vries        */
 281                 NO_PARAMS,
 282                 NO_VIDEO,
 283                 0, 0, 0, 0, 0,
 284                 NULL
 285         }, {
 286                 MACH_TYPE_LACIE_NAS,
 287                 "LaCie_NAS",    /* Benjamin Herrenschmidt */
 288                 NO_PARAMS,
 289                 NO_VIDEO,
 290                 0, 0, 0, 0, 0,
 291                 NULL
 292         }, {
 293                 MACH_TYPE_CLPS7500,
 294                 "CL-PS7500",    /* Philip Blundell      */
 295                 NO_PARAMS,
 296                 NO_VIDEO,
 297                 0, 0, 0, 0, 0,
 298                 NULL
 299         }, {
 300                 MACH_TYPE_SHARK,
 301                 "Shark",                /* Alexander Schulz     */
 302                 NO_PARAMS,
 303                 0x06000000, 0x06000000+0x001fffff,
 304                 0, 0, 0, 0, 0,
 305                 NULL
 306         }, {
 307                 MACH_TYPE_SA1100,
 308                 "SA1100-based", /* Nicolas Pitre        */
 309                 NO_PARAMS,
 310                 NO_VIDEO,
 311                 0, 0, 0, 0, 0,
 312                 fixup_sa1100
 313         }, {
 314                 MACH_TYPE_PERSONAL_SERVER,
 315                 "Compaq Personal Server",
 316                 NO_PARAMS,
 317                 NO_VIDEO,
 318                 0, 0, 0, 0, 0,
 319                 NULL
 320         }
 321 };