2 * arch/sh/kernel/setup.c
4 * This file handles the architecture-dependent parts of initialization
6 * Copyright (C) 1999 Niibe Yutaka
7 * Copyright (C) 2002 - 2006 Paul Mundt
9 #include <linux/screen_info.h>
10 #include <linux/ioport.h>
11 #include <linux/init.h>
12 #include <linux/initrd.h>
13 #include <linux/bootmem.h>
14 #include <linux/console.h>
15 #include <linux/seq_file.h>
16 #include <linux/root_dev.h>
17 #include <linux/utsname.h>
18 #include <linux/cpu.h>
19 #include <linux/pfn.h>
21 #include <asm/uaccess.h>
23 #include <asm/sections.h>
25 #include <asm/setup.h>
26 #include <asm/clock.h>
30 static int kgdb_parse_options(char *options);
32 extern void * __rd_start, * __rd_end;
38 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
39 * This value will be used at the very early stage of serial setup.
40 * The bigger value means no problem.
42 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
44 struct screen_info screen_info;
47 #if defined(CONFIG_SH_UNKNOWN)
48 struct sh_machine_vector sh_mv;
51 extern int root_mountflags;
53 #define MV_NAME_SIZE 32
55 static struct sh_machine_vector* __init get_mv_byname(const char* name);
58 * This is set up by the setup-routine at boot-time
60 #define PARAM ((unsigned char *)empty_zero_page)
62 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
63 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
64 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
65 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
66 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
67 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
69 #define COMMAND_LINE ((char *) (PARAM+0x100))
71 #define RAMDISK_IMAGE_START_MASK 0x07FF
72 #define RAMDISK_PROMPT_FLAG 0x8000
73 #define RAMDISK_LOAD_FLAG 0x4000
75 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
77 static struct resource code_resource = { .name = "Kernel code", };
78 static struct resource data_resource = { .name = "Kernel data", };
80 unsigned long memory_start, memory_end;
82 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
83 struct sh_machine_vector** mvp,
84 unsigned long *mv_io_base)
86 char c = ' ', *to = command_line, *from = COMMAND_LINE;
89 /* Save unparsed command line copy for /proc/cmdline */
90 memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
91 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
93 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
94 memory_end = memory_start + __MEMORY_SIZE;
98 * "mem=XXX[kKmM]" defines a size of memory.
100 if (c == ' ' && !memcmp(from, "mem=", 4)) {
101 if (to != command_line)
104 unsigned long mem_size;
106 mem_size = memparse(from+4, &from);
107 memory_end = memory_start + mem_size;
111 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
115 if (to != command_line)
118 mv_end = strchr(from, ' ');
120 mv_end = from + strlen(from);
122 mv_comma = strchr(from, ',');
123 if ((mv_comma != NULL) && (mv_comma < mv_end)) {
125 get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
126 *mv_io_base = ints[1];
127 mv_len = mv_comma - from;
129 mv_len = mv_end - from;
131 if (mv_len > (MV_NAME_SIZE-1))
132 mv_len = MV_NAME_SIZE-1;
133 memcpy(mv_name, from, mv_len);
134 mv_name[mv_len] = '\0';
137 *mvp = get_mv_byname(mv_name);
143 if (COMMAND_LINE_SIZE <= ++len)
148 *cmdline_p = command_line;
151 static int __init sh_mv_setup(char **cmdline_p)
153 #ifdef CONFIG_SH_UNKNOWN
154 extern struct sh_machine_vector mv_unknown;
156 struct sh_machine_vector *mv = NULL;
157 char mv_name[MV_NAME_SIZE] = "";
158 unsigned long mv_io_base = 0;
160 parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base);
162 #ifdef CONFIG_SH_UNKNOWN
165 if (*mv_name != '\0') {
166 printk("Warning: Unsupported machine %s, using unknown\n",
174 * Manually walk the vec, fill in anything that the board hasn't yet
175 * by hand, wrapping to the generic implementation.
177 #define mv_set(elem) do { \
178 if (!sh_mv.mv_##elem) \
179 sh_mv.mv_##elem = generic_##elem; \
182 mv_set(inb); mv_set(inw); mv_set(inl);
183 mv_set(outb); mv_set(outw); mv_set(outl);
185 mv_set(inb_p); mv_set(inw_p); mv_set(inl_p);
186 mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
188 mv_set(insb); mv_set(insw); mv_set(insl);
189 mv_set(outsb); mv_set(outsw); mv_set(outsl);
191 mv_set(readb); mv_set(readw); mv_set(readl);
192 mv_set(writeb); mv_set(writew); mv_set(writel);
195 mv_set(ioport_unmap);
198 #ifdef CONFIG_SH_UNKNOWN
199 __set_io_port_base(mv_io_base);
202 if (!sh_mv.mv_nr_irqs)
203 sh_mv.mv_nr_irqs = NR_IRQS;
208 void __init setup_arch(char **cmdline_p)
210 unsigned long bootmap_size;
211 unsigned long start_pfn, max_pfn, max_low_pfn;
213 #ifdef CONFIG_CMDLINE_BOOL
214 strcpy(COMMAND_LINE, CONFIG_CMDLINE);
217 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
219 #ifdef CONFIG_BLK_DEV_RAM
220 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
221 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
222 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
225 if (!MOUNT_ROOT_RDONLY)
226 root_mountflags &= ~MS_RDONLY;
227 init_mm.start_code = (unsigned long) _text;
228 init_mm.end_code = (unsigned long) _etext;
229 init_mm.end_data = (unsigned long) _edata;
230 init_mm.brk = (unsigned long) _end;
232 code_resource.start = (unsigned long)virt_to_phys(_text);
233 code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
234 data_resource.start = (unsigned long)virt_to_phys(_etext);
235 data_resource.end = (unsigned long)virt_to_phys(_edata)-1;
237 sh_mv_setup(cmdline_p);
241 * Find the highest page frame number we have available
243 max_pfn = PFN_DOWN(__pa(memory_end));
246 * Determine low and high memory ranges:
248 max_low_pfn = max_pfn;
251 * Partially used pages are not usable - thus
252 * we are rounding upwards:
254 start_pfn = PFN_UP(__pa(_end));
257 * Find a proper area for the bootmem bitmap. After this
258 * bootstrap step all allocations (until the page allocator
259 * is intact) must be done via bootmem_alloc().
261 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
262 __MEMORY_START>>PAGE_SHIFT,
265 * Register fully available low RAM pages with the bootmem allocator.
268 unsigned long curr_pfn, last_pfn, pages;
271 * We are rounding up the start address of usable memory:
273 curr_pfn = PFN_UP(__MEMORY_START);
275 * ... and at the end of the usable range downwards:
277 last_pfn = PFN_DOWN(__pa(memory_end));
279 if (last_pfn > max_low_pfn)
280 last_pfn = max_low_pfn;
282 pages = last_pfn - curr_pfn;
283 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
289 * Reserve the kernel text and
290 * Reserve the bootmem bitmap. We do this in two steps (first step
291 * was init_bootmem()), because this catches the (definitely buggy)
292 * case of us accidentally initializing the bootmem allocator with
293 * an invalid RAM area.
295 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
296 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
299 * reserve physical page 0 - it's a special BIOS page on many boxes,
300 * enabling clean reboots, SMP operation, laptop functions.
302 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
304 #ifdef CONFIG_BLK_DEV_INITRD
305 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
306 if (&__rd_start != &__rd_end) {
308 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
310 INITRD_SIZE = (unsigned long)&__rd_end -
311 (unsigned long)&__rd_start;
314 if (LOADER_TYPE && INITRD_START) {
315 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
316 reserve_bootmem_node(NODE_DATA(0), INITRD_START +
317 __MEMORY_START, INITRD_SIZE);
318 initrd_start = INITRD_START + PAGE_OFFSET +
320 initrd_end = initrd_start + INITRD_SIZE;
322 printk("initrd extends beyond end of memory "
323 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
324 INITRD_START + INITRD_SIZE,
325 max_low_pfn << PAGE_SHIFT);
331 #ifdef CONFIG_DUMMY_CONSOLE
332 conswitchp = &dummy_con;
335 /* Perform the machine specific initialisation */
336 if (likely(sh_mv.mv_setup))
337 sh_mv.mv_setup(cmdline_p);
342 struct sh_machine_vector* __init get_mv_byname(const char* name)
344 extern long __machvec_start, __machvec_end;
345 struct sh_machine_vector *all_vecs =
346 (struct sh_machine_vector *)&__machvec_start;
348 int i, n = ((unsigned long)&__machvec_end
349 - (unsigned long)&__machvec_start)/
350 sizeof(struct sh_machine_vector);
352 for (i = 0; i < n; ++i) {
353 struct sh_machine_vector *mv = &all_vecs[i];
356 if (strcasecmp(name, get_system_type()) == 0) {
363 static struct cpu cpu[NR_CPUS];
365 static int __init topology_init(void)
369 for_each_possible_cpu(cpu_id)
370 register_cpu(&cpu[cpu_id], cpu_id);
375 subsys_initcall(topology_init);
377 static const char *cpu_name[] = {
378 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619",
379 [CPU_SH7604] = "SH7604", [CPU_SH7300] = "SH7300",
380 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706",
381 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708",
382 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710",
383 [CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750",
384 [CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R",
385 [CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R",
386 [CPU_SH7760] = "SH7760", [CPU_SH73180] = "SH73180",
387 [CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1",
388 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501",
389 [CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780",
390 [CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343",
391 [CPU_SH7785] = "SH7785", [CPU_SH7722] = "SH7722",
392 [CPU_SH_NONE] = "Unknown"
395 const char *get_cpu_subtype(struct sh_cpuinfo *c)
397 return cpu_name[c->type];
400 #ifdef CONFIG_PROC_FS
401 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
402 static const char *cpu_flags[] = {
403 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
404 "ptea", "llsc", "l2", NULL
407 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
411 seq_printf(m, "cpu flags\t:");
414 seq_printf(m, " %s\n", cpu_flags[0]);
418 for (i = 0; cpu_flags[i]; i++)
419 if ((c->flags & (1 << i)))
420 seq_printf(m, " %s", cpu_flags[i+1]);
425 static void show_cacheinfo(struct seq_file *m, const char *type,
426 struct cache_info info)
428 unsigned int cache_size;
430 cache_size = info.ways * info.sets * info.linesz;
432 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
433 type, cache_size >> 10, info.ways);
437 * Get CPU information for use by the procfs.
439 static int show_cpuinfo(struct seq_file *m, void *v)
441 struct sh_cpuinfo *c = v;
442 unsigned int cpu = c - cpu_data;
444 if (!cpu_online(cpu))
448 seq_printf(m, "machine\t\t: %s\n", get_system_type());
450 seq_printf(m, "processor\t: %d\n", cpu);
451 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
452 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
456 seq_printf(m, "cache type\t: ");
459 * Check for what type of cache we have, we support both the
460 * unified cache on the SH-2 and SH-3, as well as the harvard
461 * style cache on the SH-4.
463 if (c->icache.flags & SH_CACHE_COMBINED) {
464 seq_printf(m, "unified\n");
465 show_cacheinfo(m, "cache", c->icache);
467 seq_printf(m, "split (harvard)\n");
468 show_cacheinfo(m, "icache", c->icache);
469 show_cacheinfo(m, "dcache", c->dcache);
472 /* Optional secondary cache */
473 if (c->flags & CPU_HAS_L2_CACHE)
474 show_cacheinfo(m, "scache", c->scache);
476 seq_printf(m, "bogomips\t: %lu.%02lu\n",
477 c->loops_per_jiffy/(500000/HZ),
478 (c->loops_per_jiffy/(5000/HZ)) % 100);
480 return show_clocks(m);
483 static void *c_start(struct seq_file *m, loff_t *pos)
485 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
487 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
490 return c_start(m, pos);
492 static void c_stop(struct seq_file *m, void *v)
495 struct seq_operations cpuinfo_op = {
499 .show = show_cpuinfo,
501 #endif /* CONFIG_PROC_FS */
503 #ifdef CONFIG_SH_KGDB
505 * Parse command-line kgdb options. By default KGDB is enabled,
506 * entered on error (or other action) using default serial info.
507 * The command-line option can include a serial port specification
508 * and an action to override default or configured behavior.
510 struct kgdb_sermap kgdb_sci_sermap =
511 { "ttySC", 5, kgdb_sci_setup, NULL };
513 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
514 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;
516 void kgdb_register_sermap(struct kgdb_sermap *map)
518 struct kgdb_sermap *last;
520 for (last = kgdb_serlist; last->next; last = last->next)
524 map->namelen = strlen(map->name);
528 static int __init kgdb_parse_options(char *options)
533 /* Check for port spec (or use default) */
535 /* Determine port type and instance */
536 if (!memcmp(options, "tty", 3)) {
537 struct kgdb_sermap *map = kgdb_serlist;
539 while (map && memcmp(options, map->name, map->namelen))
543 KGDB_PRINTK("unknown port spec in %s\n", options);
548 kgdb_serial_setup = map->setup_fn;
549 kgdb_portnum = options[map->namelen] - '0';
550 options += map->namelen + 1;
552 options = (*options == ',') ? options+1 : options;
554 /* Read optional parameters (baud/parity/bits) */
555 baud = simple_strtoul(options, &options, 10);
559 c = toupper(*options);
560 if (c == 'E' || c == 'O' || c == 'N') {
566 if (c == '7' || c == '8') {
570 options = (*options == ',') ? options+1 : options;
574 /* Check for action specification */
575 if (!memcmp(options, "halt", 4)) {
578 } else if (!memcmp(options, "disabled", 8)) {
584 KGDB_PRINTK("ignored unknown options: %s\n", options);
589 __setup("kgdb=", kgdb_parse_options);
590 #endif /* CONFIG_SH_KGDB */