d6b817aa568fae84d1c63c0181c2407d7164ee30
[linux-2.6.git] / arch / sh / kernel / setup.c
1 /*
2  *  linux/arch/sh/kernel/setup.c
3  *
4  *  Copyright (C) 1999  Niibe Yutaka
5  *  Copyright (C) 2002, 2003  Paul Mundt
6  */
7
8 /*
9  * This file handles the architecture-dependent parts of initialization
10  */
11
12 #include <linux/screen_info.h>
13 #include <linux/ioport.h>
14 #include <linux/init.h>
15 #include <linux/initrd.h>
16 #include <linux/bootmem.h>
17 #include <linux/console.h>
18 #include <linux/seq_file.h>
19 #include <linux/root_dev.h>
20 #include <linux/utsname.h>
21 #include <linux/cpu.h>
22 #include <linux/pfn.h>
23 #include <linux/fs.h>
24 #include <asm/uaccess.h>
25 #include <asm/io.h>
26 #include <asm/sections.h>
27 #include <asm/irq.h>
28 #include <asm/setup.h>
29 #include <asm/clock.h>
30
31 #ifdef CONFIG_SH_KGDB
32 #include <asm/kgdb.h>
33 static int kgdb_parse_options(char *options);
34 #endif
35 extern void * __rd_start, * __rd_end;
36 /*
37  * Machine setup..
38  */
39
40 /*
41  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
42  * This value will be used at the very early stage of serial setup.
43  * The bigger value means no problem.
44  */
45 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
46 #ifdef CONFIG_VT
47 struct screen_info screen_info;
48 #endif
49
50 #if defined(CONFIG_SH_UNKNOWN)
51 struct sh_machine_vector sh_mv;
52 #endif
53
54 extern int root_mountflags;
55
56 #define MV_NAME_SIZE 32
57
58 static struct sh_machine_vector* __init get_mv_byname(const char* name);
59
60 /*
61  * This is set up by the setup-routine at boot-time
62  */
63 #define PARAM   ((unsigned char *)empty_zero_page)
64
65 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
66 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
67 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
68 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
69 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
70 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
71 /* ... */
72 #define COMMAND_LINE ((char *) (PARAM+0x100))
73
74 #define RAMDISK_IMAGE_START_MASK        0x07FF
75 #define RAMDISK_PROMPT_FLAG             0x8000
76 #define RAMDISK_LOAD_FLAG               0x4000
77
78 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
79
80 static struct resource code_resource = { .name = "Kernel code", };
81 static struct resource data_resource = { .name = "Kernel data", };
82
83 unsigned long memory_start, memory_end;
84
85 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
86                                   struct sh_machine_vector** mvp,
87                                   unsigned long *mv_io_base)
88 {
89         char c = ' ', *to = command_line, *from = COMMAND_LINE;
90         int len = 0;
91
92         /* Save unparsed command line copy for /proc/cmdline */
93         memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
94         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
95
96         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
97         memory_end = memory_start + __MEMORY_SIZE;
98
99         for (;;) {
100                 /*
101                  * "mem=XXX[kKmM]" defines a size of memory.
102                  */
103                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
104                         if (to != command_line)
105                                 to--;
106                         {
107                                 unsigned long mem_size;
108
109                                 mem_size = memparse(from+4, &from);
110                                 memory_end = memory_start + mem_size;
111                         }
112                 }
113
114                 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
115                         char* mv_end;
116                         char* mv_comma;
117                         int mv_len;
118                         if (to != command_line)
119                                 to--;
120                         from += 6;
121                         mv_end = strchr(from, ' ');
122                         if (mv_end == NULL)
123                                 mv_end = from + strlen(from);
124
125                         mv_comma = strchr(from, ',');
126                         if ((mv_comma != NULL) && (mv_comma < mv_end)) {
127                                 int ints[3];
128                                 get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
129                                 *mv_io_base = ints[1];
130                                 mv_len = mv_comma - from;
131                         } else {
132                                 mv_len = mv_end - from;
133                         }
134                         if (mv_len > (MV_NAME_SIZE-1))
135                                 mv_len = MV_NAME_SIZE-1;
136                         memcpy(mv_name, from, mv_len);
137                         mv_name[mv_len] = '\0';
138                         from = mv_end;
139
140                         *mvp = get_mv_byname(mv_name);
141                 }
142
143                 c = *(from++);
144                 if (!c)
145                         break;
146                 if (COMMAND_LINE_SIZE <= ++len)
147                         break;
148                 *(to++) = c;
149         }
150         *to = '\0';
151         *cmdline_p = command_line;
152 }
153
154 static int __init sh_mv_setup(char **cmdline_p)
155 {
156 #ifdef CONFIG_SH_UNKNOWN
157         extern struct sh_machine_vector mv_unknown;
158 #endif
159         struct sh_machine_vector *mv = NULL;
160         char mv_name[MV_NAME_SIZE] = "";
161         unsigned long mv_io_base = 0;
162
163         parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base);
164
165 #ifdef CONFIG_SH_UNKNOWN
166         if (mv == NULL) {
167                 mv = &mv_unknown;
168                 if (*mv_name != '\0') {
169                         printk("Warning: Unsupported machine %s, using unknown\n",
170                                mv_name);
171                 }
172         }
173         sh_mv = *mv;
174 #endif
175
176         /*
177          * Manually walk the vec, fill in anything that the board hasn't yet
178          * by hand, wrapping to the generic implementation.
179          */
180 #define mv_set(elem) do { \
181         if (!sh_mv.mv_##elem) \
182                 sh_mv.mv_##elem = generic_##elem; \
183 } while (0)
184
185         mv_set(inb);    mv_set(inw);    mv_set(inl);
186         mv_set(outb);   mv_set(outw);   mv_set(outl);
187
188         mv_set(inb_p);  mv_set(inw_p);  mv_set(inl_p);
189         mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
190
191         mv_set(insb);   mv_set(insw);   mv_set(insl);
192         mv_set(outsb);  mv_set(outsw);  mv_set(outsl);
193
194         mv_set(readb);  mv_set(readw);  mv_set(readl);
195         mv_set(writeb); mv_set(writew); mv_set(writel);
196
197         mv_set(ioport_map);
198         mv_set(ioport_unmap);
199         mv_set(irq_demux);
200
201 #ifdef CONFIG_SH_UNKNOWN
202         __set_io_port_base(mv_io_base);
203 #endif
204
205         if (!sh_mv.mv_nr_irqs)
206                 sh_mv.mv_nr_irqs = NR_IRQS;
207
208         return 0;
209 }
210
211 void __init setup_arch(char **cmdline_p)
212 {
213         unsigned long bootmap_size;
214         unsigned long start_pfn, max_pfn, max_low_pfn;
215
216 #ifdef CONFIG_CMDLINE_BOOL
217         strcpy(COMMAND_LINE, CONFIG_CMDLINE);
218 #endif
219
220         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
221
222 #ifdef CONFIG_BLK_DEV_RAM
223         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
224         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
225         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
226 #endif
227
228         if (!MOUNT_ROOT_RDONLY)
229                 root_mountflags &= ~MS_RDONLY;
230         init_mm.start_code = (unsigned long) _text;
231         init_mm.end_code = (unsigned long) _etext;
232         init_mm.end_data = (unsigned long) _edata;
233         init_mm.brk = (unsigned long) _end;
234
235         code_resource.start = (unsigned long)virt_to_phys(_text);
236         code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
237         data_resource.start = (unsigned long)virt_to_phys(_etext);
238         data_resource.end = (unsigned long)virt_to_phys(_edata)-1;
239
240         sh_mv_setup(cmdline_p);
241
242
243         /*
244          * Find the highest page frame number we have available
245          */
246         max_pfn = PFN_DOWN(__pa(memory_end));
247
248         /*
249          * Determine low and high memory ranges:
250          */
251         max_low_pfn = max_pfn;
252
253         /*
254          * Partially used pages are not usable - thus
255          * we are rounding upwards:
256          */
257         start_pfn = PFN_UP(__pa(_end));
258
259         /*
260          * Find a proper area for the bootmem bitmap. After this
261          * bootstrap step all allocations (until the page allocator
262          * is intact) must be done via bootmem_alloc().
263          */
264         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
265                                          __MEMORY_START>>PAGE_SHIFT,
266                                          max_low_pfn);
267         /*
268          * Register fully available low RAM pages with the bootmem allocator.
269          */
270         {
271                 unsigned long curr_pfn, last_pfn, pages;
272
273                 /*
274                  * We are rounding up the start address of usable memory:
275                  */
276                 curr_pfn = PFN_UP(__MEMORY_START);
277                 /*
278                  * ... and at the end of the usable range downwards:
279                  */
280                 last_pfn = PFN_DOWN(__pa(memory_end));
281
282                 if (last_pfn > max_low_pfn)
283                         last_pfn = max_low_pfn;
284
285                 pages = last_pfn - curr_pfn;
286                 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
287                                   PFN_PHYS(pages));
288         }
289
290
291         /*
292          * Reserve the kernel text and
293          * Reserve the bootmem bitmap. We do this in two steps (first step
294          * was init_bootmem()), because this catches the (definitely buggy)
295          * case of us accidentally initializing the bootmem allocator with
296          * an invalid RAM area.
297          */
298         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
299                 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
300
301         /*
302          * reserve physical page 0 - it's a special BIOS page on many boxes,
303          * enabling clean reboots, SMP operation, laptop functions.
304          */
305         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
306
307 #ifdef CONFIG_BLK_DEV_INITRD
308         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
309         if (&__rd_start != &__rd_end) {
310                 LOADER_TYPE = 1;
311                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
312                                         __MEMORY_START;
313                 INITRD_SIZE = (unsigned long)&__rd_end -
314                               (unsigned long)&__rd_start;
315         }
316
317         if (LOADER_TYPE && INITRD_START) {
318                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
319                         reserve_bootmem_node(NODE_DATA(0), INITRD_START +
320                                                 __MEMORY_START, INITRD_SIZE);
321                         initrd_start = INITRD_START + PAGE_OFFSET +
322                                         __MEMORY_START;
323                         initrd_end = initrd_start + INITRD_SIZE;
324                 } else {
325                         printk("initrd extends beyond end of memory "
326                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
327                                     INITRD_START + INITRD_SIZE,
328                                     max_low_pfn << PAGE_SHIFT);
329                         initrd_start = 0;
330                 }
331         }
332 #endif
333
334 #ifdef CONFIG_DUMMY_CONSOLE
335         conswitchp = &dummy_con;
336 #endif
337
338         /* Perform the machine specific initialisation */
339         if (likely(sh_mv.mv_setup))
340                 sh_mv.mv_setup(cmdline_p);
341
342         paging_init();
343 }
344
345 struct sh_machine_vector* __init get_mv_byname(const char* name)
346 {
347         extern long __machvec_start, __machvec_end;
348         struct sh_machine_vector *all_vecs =
349                 (struct sh_machine_vector *)&__machvec_start;
350
351         int i, n = ((unsigned long)&__machvec_end
352                     - (unsigned long)&__machvec_start)/
353                 sizeof(struct sh_machine_vector);
354
355         for (i = 0; i < n; ++i) {
356                 struct sh_machine_vector *mv = &all_vecs[i];
357                 if (mv == NULL)
358                         continue;
359                 if (strcasecmp(name, get_system_type()) == 0) {
360                         return mv;
361                 }
362         }
363         return NULL;
364 }
365
366 static struct cpu cpu[NR_CPUS];
367
368 static int __init topology_init(void)
369 {
370         int cpu_id;
371
372         for_each_possible_cpu(cpu_id)
373                 register_cpu(&cpu[cpu_id], cpu_id);
374
375         return 0;
376 }
377
378 subsys_initcall(topology_init);
379
380 static const char *cpu_name[] = {
381         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
382         [CPU_SH7604]    = "SH7604",     [CPU_SH7300]    = "SH7300",
383         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
384         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
385         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
386         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
387         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
388         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
389         [CPU_SH7760]    = "SH7760",     [CPU_SH73180]   = "SH73180",
390         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
391         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
392         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
393         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
394         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
395         [CPU_SH_NONE]   = "Unknown"
396 };
397
398 const char *get_cpu_subtype(void)
399 {
400         return cpu_name[boot_cpu_data.type];
401 }
402
403 #ifdef CONFIG_PROC_FS
404 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
405 static const char *cpu_flags[] = {
406         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
407         "ptea", "llsc", "l2", NULL
408 };
409
410 static void show_cpuflags(struct seq_file *m)
411 {
412         unsigned long i;
413
414         seq_printf(m, "cpu flags\t:");
415
416         if (!cpu_data->flags) {
417                 seq_printf(m, " %s\n", cpu_flags[0]);
418                 return;
419         }
420
421         for (i = 0; cpu_flags[i]; i++)
422                 if ((cpu_data->flags & (1 << i)))
423                         seq_printf(m, " %s", cpu_flags[i+1]);
424
425         seq_printf(m, "\n");
426 }
427
428 static void show_cacheinfo(struct seq_file *m, const char *type,
429                            struct cache_info info)
430 {
431         unsigned int cache_size;
432
433         cache_size = info.ways * info.sets * info.linesz;
434
435         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
436                    type, cache_size >> 10, info.ways);
437 }
438
439 /*
440  *      Get CPU information for use by the procfs.
441  */
442 static int show_cpuinfo(struct seq_file *m, void *v)
443 {
444         unsigned int cpu = smp_processor_id();
445
446         if (!cpu && cpu_online(cpu))
447                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
448
449         seq_printf(m, "processor\t: %d\n", cpu);
450         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
451         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());
452
453         show_cpuflags(m);
454
455         seq_printf(m, "cache type\t: ");
456
457         /*
458          * Check for what type of cache we have, we support both the
459          * unified cache on the SH-2 and SH-3, as well as the harvard
460          * style cache on the SH-4.
461          */
462         if (boot_cpu_data.icache.flags & SH_CACHE_COMBINED) {
463                 seq_printf(m, "unified\n");
464                 show_cacheinfo(m, "cache", boot_cpu_data.icache);
465         } else {
466                 seq_printf(m, "split (harvard)\n");
467                 show_cacheinfo(m, "icache", boot_cpu_data.icache);
468                 show_cacheinfo(m, "dcache", boot_cpu_data.dcache);
469         }
470
471         /* Optional secondary cache */
472         if (boot_cpu_data.flags & CPU_HAS_L2_CACHE)
473                 show_cacheinfo(m, "scache", boot_cpu_data.scache);
474
475         seq_printf(m, "bogomips\t: %lu.%02lu\n",
476                      boot_cpu_data.loops_per_jiffy/(500000/HZ),
477                      (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100);
478
479         return show_clocks(m);
480 }
481
482 static void *c_start(struct seq_file *m, loff_t *pos)
483 {
484         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
485 }
486 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
487 {
488         ++*pos;
489         return c_start(m, pos);
490 }
491 static void c_stop(struct seq_file *m, void *v)
492 {
493 }
494 struct seq_operations cpuinfo_op = {
495         .start  = c_start,
496         .next   = c_next,
497         .stop   = c_stop,
498         .show   = show_cpuinfo,
499 };
500 #endif /* CONFIG_PROC_FS */
501
502 #ifdef CONFIG_SH_KGDB
503 /*
504  * Parse command-line kgdb options.  By default KGDB is enabled,
505  * entered on error (or other action) using default serial info.
506  * The command-line option can include a serial port specification
507  * and an action to override default or configured behavior.
508  */
509 struct kgdb_sermap kgdb_sci_sermap =
510 { "ttySC", 5, kgdb_sci_setup, NULL };
511
512 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
513 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;
514
515 void kgdb_register_sermap(struct kgdb_sermap *map)
516 {
517         struct kgdb_sermap *last;
518
519         for (last = kgdb_serlist; last->next; last = last->next)
520                 ;
521         last->next = map;
522         if (!map->namelen) {
523                 map->namelen = strlen(map->name);
524         }
525 }
526
527 static int __init kgdb_parse_options(char *options)
528 {
529         char c;
530         int baud;
531
532         /* Check for port spec (or use default) */
533
534         /* Determine port type and instance */
535         if (!memcmp(options, "tty", 3)) {
536                 struct kgdb_sermap *map = kgdb_serlist;
537
538                 while (map && memcmp(options, map->name, map->namelen))
539                         map = map->next;
540
541                 if (!map) {
542                         KGDB_PRINTK("unknown port spec in %s\n", options);
543                         return -1;
544                 }
545
546                 kgdb_porttype = map;
547                 kgdb_serial_setup = map->setup_fn;
548                 kgdb_portnum = options[map->namelen] - '0';
549                 options += map->namelen + 1;
550
551                 options = (*options == ',') ? options+1 : options;
552
553                 /* Read optional parameters (baud/parity/bits) */
554                 baud = simple_strtoul(options, &options, 10);
555                 if (baud != 0) {
556                         kgdb_baud = baud;
557
558                         c = toupper(*options);
559                         if (c == 'E' || c == 'O' || c == 'N') {
560                                 kgdb_parity = c;
561                                 options++;
562                         }
563
564                         c = *options;
565                         if (c == '7' || c == '8') {
566                                 kgdb_bits = c;
567                                 options++;
568                         }
569                         options = (*options == ',') ? options+1 : options;
570                 }
571         }
572
573         /* Check for action specification */
574         if (!memcmp(options, "halt", 4)) {
575                 kgdb_halt = 1;
576                 options += 4;
577         } else if (!memcmp(options, "disabled", 8)) {
578                 kgdb_enabled = 0;
579                 options += 8;
580         }
581
582         if (*options) {
583                 KGDB_PRINTK("ignored unknown options: %s\n", options);
584                 return 0;
585         }
586         return 1;
587 }
588 __setup("kgdb=", kgdb_parse_options);
589 #endif /* CONFIG_SH_KGDB */