PageRenderTime 70ms CodeModel.GetById 9ms app.highlight 54ms RepoModel.GetById 2ms app.codeStats 0ms

/arch/sh/kernel/setup.c

https://bitbucket.org/evzijst/gittest
C | 649 lines | 454 code | 109 blank | 86 comment | 74 complexity | 7f529bfcd88d72840681346896e61e56 MD5 | raw file
  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