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-rw-r--r--arch/sh/kernel/setup.c649
1 files changed, 649 insertions, 0 deletions
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
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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>
32static int kgdb_parse_options(char *options);
33#endif
34extern 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 */
44struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 0, 10000000, };
45struct screen_info screen_info;
46
47#if defined(CONFIG_SH_UNKNOWN)
48struct sh_machine_vector sh_mv;
49#endif
50
51/* We need this to satisfy some external references. */
52struct 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
64extern void platform_setup(void);
65extern char *get_system_type(void);
66extern int root_mountflags;
67
68#define MV_NAME_SIZE 32
69
70static 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
90static char command_line[COMMAND_LINE_SIZE] = { 0, };
91
92struct 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])
108static 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
116unsigned long memory_start, memory_end;
117
118static 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
187static 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
247void __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
396struct 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
418static struct cpu cpu[NR_CPUS];
419
420static 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
431subsys_initcall(topology_init);
432
433static 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
453const char *get_cpu_subtype(void)
454{
455 return cpu_name[boot_cpu_data.type];
456}
457
458#ifdef CONFIG_PROC_FS
459static const char *cpu_flags[] = {
460 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
461};
462
463static 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
481static 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 */
493static 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
541static void *c_start(struct seq_file *m, loff_t *pos)
542{
543 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
544}
545static void *c_next(struct seq_file *m, void *v, loff_t *pos)
546{
547 ++*pos;
548 return c_start(m, pos);
549}
550static void c_stop(struct seq_file *m, void *v)
551{
552}
553struct 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 */
568struct kgdb_sermap kgdb_sci_sermap =
569{ "ttySC", 5, kgdb_sci_setup, NULL };
570
571struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
572struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;
573
574void 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
586static 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
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