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   1 /* $Id: setup.c,v 1.30 2003/10/13 07:21:19 lethal Exp $
   2  *
   3  *  linux/arch/sh/kernel/setup.c
   4  *
   5  *  Copyright (C) 1999  Niibe Yutaka
   6  *  Copyright (C) 2002, 2003  Paul Mundt
   7  */
   8
   9 /*
  10  * This file handles the architecture-dependent parts of initialization
  11  */
  12
  13 #include <linux/tty.h>
  14 #include <linux/ioport.h>
  15 #include <linux/init.h>
  16 #include <linux/initrd.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/console.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/root_dev.h>
  21 #include <linux/utsname.h>
  22 #include <linux/cpu.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/io.h>
  25 #include <asm/io_generic.h>
  26 #include <asm/sections.h>
  27 #include <asm/irq.h>
  28 #include <asm/setup.h>
  29
  30 #ifdef CONFIG_SH_KGDB
  31 #include <asm/kgdb.h>
  32 static int kgdb_parse_options(char *options);
  33 #endif
  34 extern void * __rd_start, * __rd_end;
  35 /*
  36  * Machine setup..
  37  */
  38
  39 /*
  40  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  41  * This value will be used at the very early stage of serial setup.
  42  * The bigger value means no problem.
  43  */
  44 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 0, 10000000, };
  45 struct screen_info screen_info;
  46
  47 #if defined(CONFIG_SH_UNKNOWN)
  48 struct sh_machine_vector sh_mv;
  49 #endif
  50
  51 /* We need this to satisfy some external references. */
  52 struct screen_info screen_info = {
  53         0, 25,                  /* orig-x, orig-y */
  54         0,                      /* unused */
  55         0,                      /* orig-video-page */
  56         0,                      /* orig-video-mode */
  57         80,                     /* orig-video-cols */
  58         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  59         25,                     /* orig-video-lines */
  60         0,                      /* orig-video-isVGA */
  61         16                      /* orig-video-points */
  62 };
  63
  64 extern void platform_setup(void);
  65 extern char *get_system_type(void);
  66 extern int root_mountflags;
  67
  68 #define MV_NAME_SIZE 32
  69
  70 static struct sh_machine_vector* __init get_mv_byname(const char* name);
  71
  72 /*
  73  * This is set up by the setup-routine at boot-time
  74  */
  75 #define PARAM   ((unsigned char *)empty_zero_page)
  76
  77 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  78 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  79 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  80 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  81 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  82 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  83 /* ... */
  84 #define COMMAND_LINE ((char *) (PARAM+0x100))
  85
  86 #define RAMDISK_IMAGE_START_MASK        0x07FF
  87 #define RAMDISK_PROMPT_FLAG             0x8000
  88 #define RAMDISK_LOAD_FLAG               0x4000
  89
  90 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  91
  92 struct resource standard_io_resources[] = {
  93         { "dma1", 0x00, 0x1f },
  94         { "pic1", 0x20, 0x3f },
  95         { "timer", 0x40, 0x5f },
  96         { "keyboard", 0x60, 0x6f },
  97         { "dma page reg", 0x80, 0x8f },
  98         { "pic2", 0xa0, 0xbf },
  99         { "dma2", 0xc0, 0xdf },
 100         { "fpu", 0xf0, 0xff }
 101 };
 102
 103 #define STANDARD_IO_RESOURCES (sizeof(standard_io_resources)/sizeof(struct resource))
 104
 105 /* System RAM - interrupted by the 640kB-1M hole */
 106 #define code_resource (ram_resources[3])
 107 #define data_resource (ram_resources[4])
 108 static struct resource ram_resources[] = {
 109         { "System RAM", 0x000000, 0x09ffff, IORESOURCE_BUSY },
 110         { "System RAM", 0x100000, 0x100000, IORESOURCE_BUSY },
 111         { "Video RAM area", 0x0a0000, 0x0bffff },
 112         { "Kernel code", 0x100000, 0 },
 113         { "Kernel data", 0, 0 }
 114 };
 115
 116 unsigned long memory_start, memory_end;
 117
 118 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
 119                                   struct sh_machine_vector** mvp,
 120                                   unsigned long *mv_io_base,
 121                                   int *mv_mmio_enable)
 122 {
 123         char c = ' ', *to = command_line, *from = COMMAND_LINE;
 124         int len = 0;
 125
 126         /* Save unparsed command line copy for /proc/cmdline */
 127         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 128         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 129
 130         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 131         memory_end = memory_start + __MEMORY_SIZE;
 132
 133         for (;;) {
 134                 /*
 135                  * "mem=XXX[kKmM]" defines a size of memory.
 136                  */
 137                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 138                         if (to != command_line)
 139                                 to--;
 140                         {
 141                                 unsigned long mem_size;
 142
 143                                 mem_size = memparse(from+4, &from);
 144                                 memory_end = memory_start + mem_size;
 145                         }
 146                 }
 147                 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
 148                         char* mv_end;
 149                         char* mv_comma;
 150                         int mv_len;
 151                         if (to != command_line)
 152                                 to--;
 153                         from += 6;
 154                         mv_end = strchr(from, ' ');
 155                         if (mv_end == NULL)
 156                                 mv_end = from + strlen(from);
 157
 158                         mv_comma = strchr(from, ',');
 159                         if ((mv_comma != NULL) && (mv_comma < mv_end)) {
 160                                 int ints[3];
 161                                 get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
 162                                 *mv_io_base = ints[1];
 163                                 *mv_mmio_enable = ints[2];
 164                                 mv_len = mv_comma - from;
 165                         } else {
 166                                 mv_len = mv_end - from;
 167                         }
 168                         if (mv_len > (MV_NAME_SIZE-1))
 169                                 mv_len = MV_NAME_SIZE-1;
 170                         memcpy(mv_name, from, mv_len);
 171                         mv_name[mv_len] = '\0';
 172                         from = mv_end;
 173
 174                         *mvp = get_mv_byname(mv_name);
 175                 }
 176                 c = *(from++);
 177                 if (!c)
 178                         break;
 179                 if (COMMAND_LINE_SIZE <= ++len)
 180                         break;
 181                 *(to++) = c;
 182         }
 183         *to = '\0';
 184         *cmdline_p = command_line;
 185 }
 186
 187 static int __init sh_mv_setup(char **cmdline_p)
 188 {
 189 #if defined(CONFIG_SH_UNKNOWN)
 190         extern struct sh_machine_vector mv_unknown;
 191 #endif
 192         struct sh_machine_vector *mv = NULL;
 193         char mv_name[MV_NAME_SIZE] = "";
 194         unsigned long mv_io_base = 0;
 195         int mv_mmio_enable = 0;
 196
 197         parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable);
 198
 199 #ifdef CONFIG_SH_GENERIC
 200         if (mv == NULL) {
 201                 mv = &mv_unknown;
 202                 if (*mv_name != '\0') {
 203                         printk("Warning: Unsupported machine %s, using unknown\n",
 204                                mv_name);
 205                 }
 206         }
 207         sh_mv = *mv;
 208 #endif
 209 #ifdef CONFIG_SH_UNKNOWN
 210         sh_mv = mv_unknown;
 211 #endif
 212
 213         /*
 214          * Manually walk the vec, fill in anything that the board hasn't yet
 215          * by hand, wrapping to the generic implementation.
 216          */
 217 #define mv_set(elem) do { \
 218         if (!sh_mv.mv_##elem) \
 219                 sh_mv.mv_##elem = generic_##elem; \
 220 } while (0)
 221
 222         mv_set(inb);    mv_set(inw);    mv_set(inl);
 223         mv_set(outb);   mv_set(outw);   mv_set(outl);
 224
 225         mv_set(inb_p);  mv_set(inw_p);  mv_set(inl_p);
 226         mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
 227
 228         mv_set(insb);   mv_set(insw);   mv_set(insl);
 229         mv_set(outsb);  mv_set(outsw);  mv_set(outsl);
 230
 231         mv_set(readb);  mv_set(readw);  mv_set(readl);
 232         mv_set(writeb); mv_set(writew); mv_set(writel);
 233
 234         mv_set(ioremap);
 235         mv_set(iounmap);
 236
 237         mv_set(isa_port2addr);
 238         mv_set(irq_demux);
 239
 240 #ifdef CONFIG_SH_UNKNOWN
 241         __set_io_port_base(mv_io_base);
 242 #endif
 243
 244         return 0;
 245 }
 246
 247 void __init setup_arch(char **cmdline_p)
 248 {
 249         unsigned long bootmap_size;
 250         unsigned long start_pfn, max_pfn, max_low_pfn;
 251
 252 #ifdef CONFIG_EARLY_PRINTK
 253         extern void enable_early_printk(void);
 254
 255         enable_early_printk();
 256 #endif
 257 #ifdef CONFIG_CMDLINE_BOOL
 258         strcpy(COMMAND_LINE, CONFIG_CMDLINE);
 259 #endif
 260
 261         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 262
 263 #ifdef CONFIG_BLK_DEV_RAM
 264         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 265         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 266         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 267 #endif
 268
 269         if (!MOUNT_ROOT_RDONLY)
 270                 root_mountflags &= ~MS_RDONLY;
 271         init_mm.start_code = (unsigned long) _text;
 272         init_mm.end_code = (unsigned long) _etext;
 273         init_mm.end_data = (unsigned long) _edata;
 274         init_mm.brk = (unsigned long) _end;
 275
 276         code_resource.start = virt_to_bus(_text);
 277         code_resource.end = virt_to_bus(_etext)-1;
 278         data_resource.start = virt_to_bus(_etext);
 279         data_resource.end = virt_to_bus(_edata)-1;
 280
 281         sh_mv_setup(cmdline_p);
 282
 283 #define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
 284 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
 285 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 286
 287 #ifdef CONFIG_DISCONTIGMEM
 288         NODE_DATA(0)->bdata = &discontig_node_bdata[0];
 289         NODE_DATA(1)->bdata = &discontig_node_bdata[1];
 290
 291         bootmap_size = init_bootmem_node(NODE_DATA(1),
 292                                          PFN_UP(__MEMORY_START_2ND),
 293                                          PFN_UP(__MEMORY_START_2ND),
 294                                          PFN_DOWN(__MEMORY_START_2ND+__MEMORY_SIZE_2ND));
 295         free_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, __MEMORY_SIZE_2ND);
 296         reserve_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, bootmap_size);
 297 #endif
 298
 299         /*
 300          * Find the highest page frame number we have available
 301          */
 302         max_pfn = PFN_DOWN(__pa(memory_end));
 303
 304         /*
 305          * Determine low and high memory ranges:
 306          */
 307         max_low_pfn = max_pfn;
 308
 309         /*
 310          * Partially used pages are not usable - thus
 311          * we are rounding upwards:
 312          */
 313         start_pfn = PFN_UP(__pa(_end));
 314
 315         /*
 316          * Find a proper area for the bootmem bitmap. After this
 317          * bootstrap step all allocations (until the page allocator
 318          * is intact) must be done via bootmem_alloc().
 319          */
 320         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 321                                          __MEMORY_START>>PAGE_SHIFT,
 322                                          max_low_pfn);
 323         /*
 324          * Register fully available low RAM pages with the bootmem allocator.
 325          */
 326         {
 327                 unsigned long curr_pfn, last_pfn, pages;
 328
 329                 /*
 330                  * We are rounding up the start address of usable memory:
 331                  */
 332                 curr_pfn = PFN_UP(__MEMORY_START);
 333                 /*
 334                  * ... and at the end of the usable range downwards:
 335                  */
 336                 last_pfn = PFN_DOWN(__pa(memory_end));
 337
 338                 if (last_pfn > max_low_pfn)
 339                         last_pfn = max_low_pfn;
 340
 341                 pages = last_pfn - curr_pfn;
 342                 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
 343                                   PFN_PHYS(pages));
 344         }
 345
 346         /*
 347          * Reserve the kernel text and
 348          * Reserve the bootmem bitmap. We do this in two steps (first step
 349          * was init_bootmem()), because this catches the (definitely buggy)
 350          * case of us accidentally initializing the bootmem allocator with
 351          * an invalid RAM area.
 352          */
 353         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
 354                 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 355
 356         /*
 357          * reserve physical page 0 - it's a special BIOS page on many boxes,
 358          * enabling clean reboots, SMP operation, laptop functions.
 359          */
 360         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
 361
 362 #ifdef CONFIG_BLK_DEV_INITRD
 363         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 364         if (&__rd_start != &__rd_end) {
 365                 LOADER_TYPE = 1;
 366                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START;
 367                 INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start;
 368         }
 369
 370         if (LOADER_TYPE && INITRD_START) {
 371                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 372                         reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE);
 373                         initrd_start =
 374                                 INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0;
 375                         initrd_end = initrd_start + INITRD_SIZE;
 376                 } else {
 377                         printk("initrd extends beyond end of memory "
 378                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 379                                     INITRD_START + INITRD_SIZE,
 380                                     max_low_pfn << PAGE_SHIFT);
 381                         initrd_start = 0;
 382                 }
 383         }
 384 #endif
 385
 386 #ifdef CONFIG_DUMMY_CONSOLE
 387         conswitchp = &dummy_con;
 388 #endif
 389
 390         /* Perform the machine specific initialisation */
 391         platform_setup();
 392
 393         paging_init();
 394 }
 395
 396 struct sh_machine_vector* __init get_mv_byname(const char* name)
 397 {
 398         extern int strcasecmp(const char *, const char *);
 399         extern long __machvec_start, __machvec_end;
 400         struct sh_machine_vector *all_vecs =
 401                 (struct sh_machine_vector *)&__machvec_start;
 402
 403         int i, n = ((unsigned long)&__machvec_end
 404                     - (unsigned long)&__machvec_start)/
 405                 sizeof(struct sh_machine_vector);
 406
 407         for (i = 0; i < n; ++i) {
 408                 struct sh_machine_vector *mv = &all_vecs[i];
 409                 if (mv == NULL)
 410                         continue;
 411                 if (strcasecmp(name, get_system_type()) == 0) {
 412                         return mv;
 413                 }
 414         }
 415         return NULL;
 416 }
 417
 418 static struct cpu cpu[NR_CPUS];
 419
 420 static int __init topology_init(void)
 421 {
 422         int cpu_id;
 423
 424         for (cpu_id = 0; cpu_id < NR_CPUS; cpu_id++)
 425                 if (cpu_possible(cpu_id))
 426                         register_cpu(&cpu[cpu_id], cpu_id, NULL);
 427
 428         return 0;
 429 }
 430
 431 subsys_initcall(topology_init);
 432
 433 static const char *cpu_name[] = {
 434         [CPU_SH7604]    = "SH7604",
 435         [CPU_SH7705]    = "SH7705",
 436         [CPU_SH7708]    = "SH7708",
 437         [CPU_SH7729]    = "SH7729",
 438         [CPU_SH7300]    = "SH7300",
 439         [CPU_SH7750]    = "SH7750",
 440         [CPU_SH7750S]   = "SH7750S",
 441         [CPU_SH7750R]   = "SH7750R",
 442         [CPU_SH7751]    = "SH7751",
 443         [CPU_SH7751R]   = "SH7751R",
 444         [CPU_SH7760]    = "SH7760",
 445         [CPU_SH73180]   = "SH73180",
 446         [CPU_ST40RA]    = "ST40RA",
 447         [CPU_ST40GX1]   = "ST40GX1",
 448         [CPU_SH4_202]   = "SH4-202",
 449         [CPU_SH4_501]   = "SH4-501",
 450         [CPU_SH_NONE]   = "Unknown"
 451 };
 452
 453 const char *get_cpu_subtype(void)
 454 {
 455         return cpu_name[boot_cpu_data.type];
 456 }
 457
 458 #ifdef CONFIG_PROC_FS
 459 static const char *cpu_flags[] = {
 460         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 461 };
 462
 463 static void show_cpuflags(struct seq_file *m)
 464 {
 465         unsigned long i;
 466
 467         seq_printf(m, "cpu flags\t:");
 468
 469         if (!cpu_data->flags) {
 470                 seq_printf(m, " %s\n", cpu_flags[0]);
 471                 return;
 472         }
 473
 474         for (i = 0; i < cpu_data->flags; i++)
 475                 if ((cpu_data->flags & (1 << i)))
 476                         seq_printf(m, " %s", cpu_flags[i+1]);
 477
 478         seq_printf(m, "\n");
 479 }
 480
 481 static void show_cacheinfo(struct seq_file *m, const char *type, struct cache_info info)
 482 {
 483         unsigned int cache_size;
 484
 485         cache_size = info.ways * info.sets * info.linesz;
 486
 487         seq_printf(m, "%s size\t: %dKiB\n", type, cache_size >> 10);
 488 }
 489
 490 /*
 491  *      Get CPU information for use by the procfs.
 492  */
 493 static int show_cpuinfo(struct seq_file *m, void *v)
 494 {
 495         unsigned int cpu = smp_processor_id();
 496
 497         if (!cpu && cpu_online(cpu))
 498                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 499
 500         seq_printf(m, "processor\t: %d\n", cpu);
 501         seq_printf(m, "cpu family\t: %s\n", system_utsname.machine);
 502         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());
 503
 504         show_cpuflags(m);
 505
 506         seq_printf(m, "cache type\t: ");
 507
 508         /*
 509          * Check for what type of cache we have, we support both the
 510          * unified cache on the SH-2 and SH-3, as well as the harvard
 511          * style cache on the SH-4.
 512          */
 513         if (test_bit(SH_CACHE_COMBINED, &(boot_cpu_data.icache.flags))) {
 514                 seq_printf(m, "unified\n");
 515                 show_cacheinfo(m, "cache", boot_cpu_data.icache);
 516         } else {
 517                 seq_printf(m, "split (harvard)\n");
 518                 show_cacheinfo(m, "icache", boot_cpu_data.icache);
 519                 show_cacheinfo(m, "dcache", boot_cpu_data.dcache);
 520         }
 521
 522         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 523                      boot_cpu_data.loops_per_jiffy/(500000/HZ),
 524                      (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100);
 525
 526 #define PRINT_CLOCK(name, value) \
 527         seq_printf(m, name " clock\t: %d.%02dMHz\n", \
 528                      ((value) / 1000000), ((value) % 1000000)/10000)
 529
 530         PRINT_CLOCK("cpu", boot_cpu_data.cpu_clock);
 531         PRINT_CLOCK("bus", boot_cpu_data.bus_clock);
 532 #ifdef CONFIG_CPU_SUBTYPE_ST40STB1
 533         PRINT_CLOCK("memory", boot_cpu_data.memory_clock);
 534 #endif
 535         PRINT_CLOCK("module", boot_cpu_data.module_clock);
 536
 537         return 0;
 538 }
 539
 540
 541 static void *c_start(struct seq_file *m, loff_t *pos)
 542 {
 543         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 544 }
 545 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 546 {
 547         ++*pos;
 548         return c_start(m, pos);
 549 }
 550 static void c_stop(struct seq_file *m, void *v)
 551 {
 552 }
 553 struct seq_operations cpuinfo_op = {
 554         .start  = c_start,
 555         .next   = c_next,
 556         .stop   = c_stop,
 557         .show   = show_cpuinfo,
 558 };
 559 #endif /* CONFIG_PROC_FS */
 560
 561 #ifdef CONFIG_SH_KGDB
 562 /*
 563  * Parse command-line kgdb options.  By default KGDB is enabled,
 564  * entered on error (or other action) using default serial info.
 565  * The command-line option can include a serial port specification
 566  * and an action to override default or configured behavior.
 567  */
 568 struct kgdb_sermap kgdb_sci_sermap =
 569 { "ttySC", 5, kgdb_sci_setup, NULL };
 570
 571 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
 572 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;
 573
 574 void kgdb_register_sermap(struct kgdb_sermap *map)
 575 {
 576         struct kgdb_sermap *last;
 577
 578         for (last = kgdb_serlist; last->next; last = last->next)
 579                 ;
 580         last->next = map;
 581         if (!map->namelen) {
 582                 map->namelen = strlen(map->name);
 583         }
 584 }
 585
 586 static int __init kgdb_parse_options(char *options)
 587 {
 588         char c;
 589         int baud;
 590
 591         /* Check for port spec (or use default) */
 592
 593         /* Determine port type and instance */
 594         if (!memcmp(options, "tty", 3)) {
 595                 struct kgdb_sermap *map = kgdb_serlist;
 596
 597                 while (map && memcmp(options, map->name, map->namelen))
 598                         map = map->next;
 599
 600                 if (!map) {
 601                         KGDB_PRINTK("unknown port spec in %s\n", options);
 602                         return -1;
 603                 }
 604
 605                 kgdb_porttype = map;
 606                 kgdb_serial_setup = map->setup_fn;
 607                 kgdb_portnum = options[map->namelen] - '0';
 608                 options += map->namelen + 1;
 609
 610                 options = (*options == ',') ? options+1 : options;
 611
 612                 /* Read optional parameters (baud/parity/bits) */
 613                 baud = simple_strtoul(options, &options, 10);
 614                 if (baud != 0) {
 615                         kgdb_baud = baud;
 616
 617                         c = toupper(*options);
 618                         if (c == 'E' || c == 'O' || c == 'N') {
 619                                 kgdb_parity = c;
 620                                 options++;
 621                         }
 622
 623                         c = *options;
 624                         if (c == '7' || c == '8') {
 625                                 kgdb_bits = c;
 626                                 options++;
 627                         }
 628                         options = (*options == ',') ? options+1 : options;
 629                 }
 630         }
 631
 632         /* Check for action specification */
 633         if (!memcmp(options, "halt", 4)) {
 634                 kgdb_halt = 1;
 635                 options += 4;
 636         } else if (!memcmp(options, "disabled", 8)) {
 637                 kgdb_enabled = 0;
 638                 options += 8;
 639         }
 640
 641         if (*options) {
 642                 KGDB_PRINTK("ignored unknown options: %s\n", options);
 643                 return 0;
 644         }
 645         return 1;
 646 }
 647 __setup("kgdb=", kgdb_parse_options);
 648 #endif /* CONFIG_SH_KGDB */
 649