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 - 2007 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/nodemask.h>
19 #include <linux/cpu.h>
20 #include <linux/pfn.h>
23 #include <linux/kexec.h>
24 #include <linux/module.h>
25 #include <linux/smp.h>
26 #include <linux/err.h>
27 #include <linux/debugfs.h>
28 #include <linux/crash_dump.h>
29 #include <linux/mmzone.h>
30 #include <linux/clk.h>
31 #include <linux/delay.h>
32 #include <linux/platform_device.h>
33 #include <linux/lmb.h>
34 #include <asm/uaccess.h>
38 #include <asm/sections.h>
40 #include <asm/setup.h>
41 #include <asm/clock.h>
43 #include <asm/mmu_context.h>
46 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
47 * This value will be used at the very early stage of serial setup.
48 * The bigger value means no problem.
50 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
53 .family = CPU_FAMILY_UNKNOWN,
54 .loops_per_jiffy = 10000000,
57 EXPORT_SYMBOL(cpu_data);
60 * The machine vector. First entry in .machvec.init, or clobbered by
61 * sh_mv= on the command line, prior to .machvec.init teardown.
63 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
67 struct screen_info screen_info;
70 extern int root_mountflags;
72 #define RAMDISK_IMAGE_START_MASK 0x07FF
73 #define RAMDISK_PROMPT_FLAG 0x8000
74 #define RAMDISK_LOAD_FLAG 0x4000
76 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
78 static struct resource code_resource = {
79 .name = "Kernel code",
80 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
83 static struct resource data_resource = {
84 .name = "Kernel data",
85 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
88 static struct resource bss_resource = {
90 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
93 unsigned long memory_start;
94 EXPORT_SYMBOL(memory_start);
95 unsigned long memory_end = 0;
96 EXPORT_SYMBOL(memory_end);
98 static struct resource mem_resources[MAX_NUMNODES];
100 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
102 static int __init early_parse_mem(char *p)
106 memory_start = (unsigned long)__va(__MEMORY_START);
107 size = memparse(p, &p);
109 if (size > __MEMORY_SIZE) {
111 "Using mem= to increase the size of kernel memory "
113 " Recompile the kernel with the correct value for "
114 "CONFIG_MEMORY_SIZE.\n");
118 memory_end = memory_start + size;
122 early_param("mem", early_parse_mem);
125 * Register fully available low RAM pages with the bootmem allocator.
127 static void __init register_bootmem_low_pages(void)
129 unsigned long curr_pfn, last_pfn, pages;
132 * We are rounding up the start address of usable memory:
134 curr_pfn = PFN_UP(__MEMORY_START);
137 * ... and at the end of the usable range downwards:
139 last_pfn = PFN_DOWN(__pa(memory_end));
141 if (last_pfn > max_low_pfn)
142 last_pfn = max_low_pfn;
144 pages = last_pfn - curr_pfn;
145 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
149 static void __init reserve_crashkernel(void)
151 unsigned long long free_mem;
152 unsigned long long crash_size, crash_base;
156 free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
158 ret = parse_crashkernel(boot_command_line, free_mem,
159 &crash_size, &crash_base);
160 if (ret == 0 && crash_size) {
161 if (crash_base <= 0) {
162 vp = alloc_bootmem_nopanic(crash_size);
164 printk(KERN_INFO "crashkernel allocation "
168 crash_base = __pa(vp);
169 } else if (reserve_bootmem(crash_base, crash_size,
170 BOOTMEM_EXCLUSIVE) < 0) {
171 printk(KERN_INFO "crashkernel reservation failed - "
172 "memory is in use\n");
176 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
177 "for crashkernel (System RAM: %ldMB)\n",
178 (unsigned long)(crash_size >> 20),
179 (unsigned long)(crash_base >> 20),
180 (unsigned long)(free_mem >> 20));
181 crashk_res.start = crash_base;
182 crashk_res.end = crash_base + crash_size - 1;
183 insert_resource(&iomem_resource, &crashk_res);
187 static inline void __init reserve_crashkernel(void)
191 static void __init check_for_initrd(void)
193 #ifdef CONFIG_BLK_DEV_INITRD
194 unsigned long start, end;
197 * Check for the rare cases where boot loaders adhere to the boot
200 if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
203 start = INITRD_START + __MEMORY_START;
204 end = start + INITRD_SIZE;
206 if (unlikely(end <= start))
208 if (unlikely(start & ~PAGE_MASK)) {
209 pr_err("initrd must be page aligned\n");
213 if (unlikely(start < PAGE_OFFSET)) {
214 pr_err("initrd start < PAGE_OFFSET\n");
218 if (unlikely(end > lmb_end_of_DRAM())) {
219 pr_err("initrd extends beyond end of memory "
220 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
221 end, (unsigned long)lmb_end_of_DRAM());
226 * If we got this far inspite of the boot loader's best efforts
227 * to the contrary, assume we actually have a valid initrd and
228 * fix up the root dev.
230 ROOT_DEV = Root_RAM0;
233 * Address sanitization
235 initrd_start = (unsigned long)__va(__pa(start));
236 initrd_end = initrd_start + INITRD_SIZE;
238 reserve_bootmem(__pa(initrd_start), INITRD_SIZE, BOOTMEM_DEFAULT);
243 pr_info("initrd disabled\n");
244 initrd_start = initrd_end = 0;
248 void __cpuinit calibrate_delay(void)
250 struct clk *clk = clk_get(NULL, "cpu_clk");
253 panic("Need a sane CPU clock definition!");
255 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
257 printk(KERN_INFO "Calibrating delay loop (skipped)... "
258 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
259 loops_per_jiffy/(500000/HZ),
260 (loops_per_jiffy/(5000/HZ)) % 100,
264 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
265 unsigned long end_pfn)
267 struct resource *res = &mem_resources[nid];
269 WARN_ON(res->name); /* max one active range per node for now */
271 res->name = "System RAM";
272 res->start = start_pfn << PAGE_SHIFT;
273 res->end = (end_pfn << PAGE_SHIFT) - 1;
274 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
275 if (request_resource(&iomem_resource, res)) {
276 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
282 * We don't know which RAM region contains kernel data,
283 * so we try it repeatedly and let the resource manager
286 request_resource(res, &code_resource);
287 request_resource(res, &data_resource);
288 request_resource(res, &bss_resource);
290 add_active_range(nid, start_pfn, end_pfn);
293 void __init setup_bootmem_allocator(unsigned long free_pfn)
295 unsigned long bootmap_size;
296 unsigned long bootmap_pages, bootmem_paddr;
297 u64 total_pages = (lmb_end_of_DRAM() - __MEMORY_START) >> PAGE_SHIFT;
300 bootmap_pages = bootmem_bootmap_pages(total_pages);
302 bootmem_paddr = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
305 * Find a proper area for the bootmem bitmap. After this
306 * bootstrap step all allocations (until the page allocator
307 * is intact) must be done via bootmem_alloc().
309 bootmap_size = init_bootmem_node(NODE_DATA(0),
310 bootmem_paddr >> PAGE_SHIFT,
311 min_low_pfn, max_low_pfn);
313 /* Add active regions with valid PFNs. */
314 for (i = 0; i < lmb.memory.cnt; i++) {
315 unsigned long start_pfn, end_pfn;
316 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
317 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
318 __add_active_range(0, start_pfn, end_pfn);
322 * Add all physical memory to the bootmem map and mark each
325 register_bootmem_low_pages();
327 /* Reserve the sections we're already using. */
328 for (i = 0; i < lmb.reserved.cnt; i++)
329 reserve_bootmem(lmb.reserved.region[i].base,
330 lmb_size_bytes(&lmb.reserved, i),
335 sparse_memory_present_with_active_regions(0);
339 reserve_crashkernel();
342 #ifndef CONFIG_NEED_MULTIPLE_NODES
343 static void __init setup_memory(void)
345 unsigned long start_pfn;
346 u64 base = min_low_pfn << PAGE_SHIFT;
347 u64 size = (max_low_pfn << PAGE_SHIFT) - base;
350 * Partially used pages are not usable - thus
351 * we are rounding upwards:
353 start_pfn = PFN_UP(__pa(_end));
358 * Reserve the kernel text and
359 * Reserve the bootmem bitmap. We do this in two steps (first step
360 * was init_bootmem()), because this catches the (definitely buggy)
361 * case of us accidentally initializing the bootmem allocator with
362 * an invalid RAM area.
364 lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
365 (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
366 (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
369 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
371 if (CONFIG_ZERO_PAGE_OFFSET != 0)
372 lmb_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
377 setup_bootmem_allocator(start_pfn);
380 extern void __init setup_memory(void);
384 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
385 * is_kdump_kernel() to determine if we are booting after a panic. Hence
386 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
388 #ifdef CONFIG_CRASH_DUMP
389 /* elfcorehdr= specifies the location of elf core header
390 * stored by the crashed kernel.
392 static int __init parse_elfcorehdr(char *arg)
396 elfcorehdr_addr = memparse(arg, &arg);
399 early_param("elfcorehdr", parse_elfcorehdr);
402 void __init __attribute__ ((weak)) plat_early_device_setup(void)
406 void __init setup_arch(char **cmdline_p)
410 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
412 printk(KERN_NOTICE "Boot params:\n"
413 "... MOUNT_ROOT_RDONLY - %08lx\n"
414 "... RAMDISK_FLAGS - %08lx\n"
415 "... ORIG_ROOT_DEV - %08lx\n"
416 "... LOADER_TYPE - %08lx\n"
417 "... INITRD_START - %08lx\n"
418 "... INITRD_SIZE - %08lx\n",
419 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
420 ORIG_ROOT_DEV, LOADER_TYPE,
421 INITRD_START, INITRD_SIZE);
423 #ifdef CONFIG_BLK_DEV_RAM
424 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
425 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
426 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
429 if (!MOUNT_ROOT_RDONLY)
430 root_mountflags &= ~MS_RDONLY;
431 init_mm.start_code = (unsigned long) _text;
432 init_mm.end_code = (unsigned long) _etext;
433 init_mm.end_data = (unsigned long) _edata;
434 init_mm.brk = (unsigned long) _end;
436 code_resource.start = virt_to_phys(_text);
437 code_resource.end = virt_to_phys(_etext)-1;
438 data_resource.start = virt_to_phys(_etext);
439 data_resource.end = virt_to_phys(_edata)-1;
440 bss_resource.start = virt_to_phys(__bss_start);
441 bss_resource.end = virt_to_phys(_ebss)-1;
443 memory_start = (unsigned long)__va(__MEMORY_START);
445 memory_end = memory_start + __MEMORY_SIZE;
447 #ifdef CONFIG_CMDLINE_OVERWRITE
448 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
450 strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
451 #ifdef CONFIG_CMDLINE_EXTEND
452 strlcat(command_line, " ", sizeof(command_line));
453 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
457 /* Save unparsed command line copy for /proc/cmdline */
458 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
459 *cmdline_p = command_line;
465 plat_early_device_setup();
467 /* Let earlyprintk output early console messages */
468 early_platform_driver_probe("earlyprintk", 1, 1);
473 * Find the highest page frame number we have available
475 max_pfn = PFN_DOWN(__pa(memory_end));
478 * Determine low and high memory ranges:
480 max_low_pfn = max_pfn;
481 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
483 nodes_clear(node_online_map);
490 #ifdef CONFIG_DUMMY_CONSOLE
491 conswitchp = &dummy_con;
495 ioremap_fixed_init();
497 /* Perform the machine specific initialisation */
498 if (likely(sh_mv.mv_setup))
499 sh_mv.mv_setup(cmdline_p);
504 /* processor boot mode configuration */
505 int generic_mode_pins(void)
507 pr_warning("generic_mode_pins(): missing mode pin configuration\n");
511 int test_mode_pin(int pin)
513 return sh_mv.mv_mode_pins() & pin;
516 static const char *cpu_name[] = {
517 [CPU_SH7201] = "SH7201",
518 [CPU_SH7203] = "SH7203", [CPU_SH7263] = "SH7263",
519 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619",
520 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706",
521 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708",
522 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710",
523 [CPU_SH7712] = "SH7712", [CPU_SH7720] = "SH7720",
524 [CPU_SH7721] = "SH7721", [CPU_SH7729] = "SH7729",
525 [CPU_SH7750] = "SH7750", [CPU_SH7750S] = "SH7750S",
526 [CPU_SH7750R] = "SH7750R", [CPU_SH7751] = "SH7751",
527 [CPU_SH7751R] = "SH7751R", [CPU_SH7760] = "SH7760",
528 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501",
529 [CPU_SH7763] = "SH7763", [CPU_SH7770] = "SH7770",
530 [CPU_SH7780] = "SH7780", [CPU_SH7781] = "SH7781",
531 [CPU_SH7343] = "SH7343", [CPU_SH7785] = "SH7785",
532 [CPU_SH7786] = "SH7786", [CPU_SH7757] = "SH7757",
533 [CPU_SH7722] = "SH7722", [CPU_SHX3] = "SH-X3",
534 [CPU_SH5_101] = "SH5-101", [CPU_SH5_103] = "SH5-103",
535 [CPU_MXG] = "MX-G", [CPU_SH7723] = "SH7723",
536 [CPU_SH7366] = "SH7366", [CPU_SH7724] = "SH7724",
537 [CPU_SH_NONE] = "Unknown"
540 const char *get_cpu_subtype(struct sh_cpuinfo *c)
542 return cpu_name[c->type];
544 EXPORT_SYMBOL(get_cpu_subtype);
546 #ifdef CONFIG_PROC_FS
547 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
548 static const char *cpu_flags[] = {
549 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
550 "ptea", "llsc", "l2", "op32", "pteaex", NULL
553 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
557 seq_printf(m, "cpu flags\t:");
560 seq_printf(m, " %s\n", cpu_flags[0]);
564 for (i = 0; cpu_flags[i]; i++)
565 if ((c->flags & (1 << i)))
566 seq_printf(m, " %s", cpu_flags[i+1]);
571 static void show_cacheinfo(struct seq_file *m, const char *type,
572 struct cache_info info)
574 unsigned int cache_size;
576 cache_size = info.ways * info.sets * info.linesz;
578 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
579 type, cache_size >> 10, info.ways);
583 * Get CPU information for use by the procfs.
585 static int show_cpuinfo(struct seq_file *m, void *v)
587 struct sh_cpuinfo *c = v;
588 unsigned int cpu = c - cpu_data;
590 if (!cpu_online(cpu))
594 seq_printf(m, "machine\t\t: %s\n", get_system_type());
598 seq_printf(m, "processor\t: %d\n", cpu);
599 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
600 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
601 if (c->cut_major == -1)
602 seq_printf(m, "cut\t\t: unknown\n");
603 else if (c->cut_minor == -1)
604 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
606 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
610 seq_printf(m, "cache type\t: ");
613 * Check for what type of cache we have, we support both the
614 * unified cache on the SH-2 and SH-3, as well as the harvard
615 * style cache on the SH-4.
617 if (c->icache.flags & SH_CACHE_COMBINED) {
618 seq_printf(m, "unified\n");
619 show_cacheinfo(m, "cache", c->icache);
621 seq_printf(m, "split (harvard)\n");
622 show_cacheinfo(m, "icache", c->icache);
623 show_cacheinfo(m, "dcache", c->dcache);
626 /* Optional secondary cache */
627 if (c->flags & CPU_HAS_L2_CACHE)
628 show_cacheinfo(m, "scache", c->scache);
630 seq_printf(m, "bogomips\t: %lu.%02lu\n",
631 c->loops_per_jiffy/(500000/HZ),
632 (c->loops_per_jiffy/(5000/HZ)) % 100);
637 static void *c_start(struct seq_file *m, loff_t *pos)
639 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
641 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
644 return c_start(m, pos);
646 static void c_stop(struct seq_file *m, void *v)
649 const struct seq_operations cpuinfo_op = {
653 .show = show_cpuinfo,
655 #endif /* CONFIG_PROC_FS */
657 struct dentry *sh_debugfs_root;
659 static int __init sh_debugfs_init(void)
661 sh_debugfs_root = debugfs_create_dir("sh", NULL);
662 if (!sh_debugfs_root)
664 if (IS_ERR(sh_debugfs_root))
665 return PTR_ERR(sh_debugfs_root);
669 arch_initcall(sh_debugfs_init);