docbook: fix fatal rapidio yet again (and more to come)
[linux/fpc-iii.git] / arch / sh / kernel / setup.c
blob284f66f1ebbeb812be6623c7111d820ccaa4ad01
1 /*
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
8 */
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>
21 #include <linux/fs.h>
22 #include <linux/mm.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 <asm/uaccess.h>
29 #include <asm/io.h>
30 #include <asm/page.h>
31 #include <asm/elf.h>
32 #include <asm/sections.h>
33 #include <asm/irq.h>
34 #include <asm/setup.h>
35 #include <asm/clock.h>
36 #include <asm/mmu_context.h>
39 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
40 * This value will be used at the very early stage of serial setup.
41 * The bigger value means no problem.
43 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
44 [0] = {
45 .type = CPU_SH_NONE,
46 .loops_per_jiffy = 10000000,
49 EXPORT_SYMBOL(cpu_data);
52 * The machine vector. First entry in .machvec.init, or clobbered by
53 * sh_mv= on the command line, prior to .machvec.init teardown.
55 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
57 #ifdef CONFIG_VT
58 struct screen_info screen_info;
59 #endif
61 extern int root_mountflags;
63 #define RAMDISK_IMAGE_START_MASK 0x07FF
64 #define RAMDISK_PROMPT_FLAG 0x8000
65 #define RAMDISK_LOAD_FLAG 0x4000
67 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
69 static struct resource code_resource = {
70 .name = "Kernel code",
71 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
74 static struct resource data_resource = {
75 .name = "Kernel data",
76 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
79 unsigned long memory_start;
80 EXPORT_SYMBOL(memory_start);
81 unsigned long memory_end = 0;
82 EXPORT_SYMBOL(memory_end);
84 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
86 static int __init early_parse_mem(char *p)
88 unsigned long size;
90 memory_start = (unsigned long)__va(__MEMORY_START);
91 size = memparse(p, &p);
93 if (size > __MEMORY_SIZE) {
94 static char msg[] __initdata = KERN_ERR
95 "Using mem= to increase the size of kernel memory "
96 "is not allowed.\n"
97 " Recompile the kernel with the correct value for "
98 "CONFIG_MEMORY_SIZE.\n";
99 printk(msg);
100 return 0;
103 memory_end = memory_start + size;
105 return 0;
107 early_param("mem", early_parse_mem);
110 * Register fully available low RAM pages with the bootmem allocator.
112 static void __init register_bootmem_low_pages(void)
114 unsigned long curr_pfn, last_pfn, pages;
117 * We are rounding up the start address of usable memory:
119 curr_pfn = PFN_UP(__MEMORY_START);
122 * ... and at the end of the usable range downwards:
124 last_pfn = PFN_DOWN(__pa(memory_end));
126 if (last_pfn > max_low_pfn)
127 last_pfn = max_low_pfn;
129 pages = last_pfn - curr_pfn;
130 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
133 #ifdef CONFIG_KEXEC
134 static void __init reserve_crashkernel(void)
136 unsigned long long free_mem;
137 unsigned long long crash_size, crash_base;
138 int ret;
140 free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
142 ret = parse_crashkernel(boot_command_line, free_mem,
143 &crash_size, &crash_base);
144 if (ret == 0 && crash_size) {
145 if (crash_base <= 0) {
146 printk(KERN_INFO "crashkernel reservation failed - "
147 "you have to specify a base address\n");
148 return;
151 if (reserve_bootmem(crash_base, crash_size,
152 BOOTMEM_EXCLUSIVE) < 0) {
153 printk(KERN_INFO "crashkernel reservation failed - "
154 "memory is in use\n");
155 return;
158 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
159 "for crashkernel (System RAM: %ldMB)\n",
160 (unsigned long)(crash_size >> 20),
161 (unsigned long)(crash_base >> 20),
162 (unsigned long)(free_mem >> 20));
163 crashk_res.start = crash_base;
164 crashk_res.end = crash_base + crash_size - 1;
167 #else
168 static inline void __init reserve_crashkernel(void)
170 #endif
172 void __init setup_bootmem_allocator(unsigned long free_pfn)
174 unsigned long bootmap_size;
177 * Find a proper area for the bootmem bitmap. After this
178 * bootstrap step all allocations (until the page allocator
179 * is intact) must be done via bootmem_alloc().
181 bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
182 min_low_pfn, max_low_pfn);
184 add_active_range(0, min_low_pfn, max_low_pfn);
185 register_bootmem_low_pages();
187 node_set_online(0);
190 * Reserve the kernel text and
191 * Reserve the bootmem bitmap. We do this in two steps (first step
192 * was init_bootmem()), because this catches the (definitely buggy)
193 * case of us accidentally initializing the bootmem allocator with
194 * an invalid RAM area.
196 reserve_bootmem(__MEMORY_START+PAGE_SIZE,
197 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START,
198 BOOTMEM_DEFAULT);
201 * reserve physical page 0 - it's a special BIOS page on many boxes,
202 * enabling clean reboots, SMP operation, laptop functions.
204 reserve_bootmem(__MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
206 sparse_memory_present_with_active_regions(0);
208 #ifdef CONFIG_BLK_DEV_INITRD
209 ROOT_DEV = Root_RAM0;
211 if (LOADER_TYPE && INITRD_START) {
212 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
213 reserve_bootmem(INITRD_START + __MEMORY_START,
214 INITRD_SIZE, BOOTMEM_DEFAULT);
215 initrd_start = INITRD_START + PAGE_OFFSET +
216 __MEMORY_START;
217 initrd_end = initrd_start + INITRD_SIZE;
218 } else {
219 printk("initrd extends beyond end of memory "
220 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
221 INITRD_START + INITRD_SIZE,
222 max_low_pfn << PAGE_SHIFT);
223 initrd_start = 0;
226 #endif
228 reserve_crashkernel();
231 #ifndef CONFIG_NEED_MULTIPLE_NODES
232 static void __init setup_memory(void)
234 unsigned long start_pfn;
237 * Partially used pages are not usable - thus
238 * we are rounding upwards:
240 start_pfn = PFN_UP(__pa(_end));
241 setup_bootmem_allocator(start_pfn);
243 #else
244 extern void __init setup_memory(void);
245 #endif
247 void __init setup_arch(char **cmdline_p)
249 enable_mmu();
251 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
253 #ifdef CONFIG_BLK_DEV_RAM
254 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
255 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
256 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
257 #endif
259 if (!MOUNT_ROOT_RDONLY)
260 root_mountflags &= ~MS_RDONLY;
261 init_mm.start_code = (unsigned long) _text;
262 init_mm.end_code = (unsigned long) _etext;
263 init_mm.end_data = (unsigned long) _edata;
264 init_mm.brk = (unsigned long) _end;
266 code_resource.start = virt_to_phys(_text);
267 code_resource.end = virt_to_phys(_etext)-1;
268 data_resource.start = virt_to_phys(_etext);
269 data_resource.end = virt_to_phys(_edata)-1;
271 memory_start = (unsigned long)__va(__MEMORY_START);
272 if (!memory_end)
273 memory_end = memory_start + __MEMORY_SIZE;
275 #ifdef CONFIG_CMDLINE_BOOL
276 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
277 #else
278 strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
279 #endif
281 /* Save unparsed command line copy for /proc/cmdline */
282 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
283 *cmdline_p = command_line;
285 parse_early_param();
287 sh_mv_setup();
290 * Find the highest page frame number we have available
292 max_pfn = PFN_DOWN(__pa(memory_end));
295 * Determine low and high memory ranges:
297 max_low_pfn = max_pfn;
298 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
300 nodes_clear(node_online_map);
302 /* Setup bootmem with available RAM */
303 setup_memory();
304 sparse_init();
306 #ifdef CONFIG_DUMMY_CONSOLE
307 conswitchp = &dummy_con;
308 #endif
310 /* Perform the machine specific initialisation */
311 if (likely(sh_mv.mv_setup))
312 sh_mv.mv_setup(cmdline_p);
314 paging_init();
316 #ifdef CONFIG_SMP
317 plat_smp_setup();
318 #endif
321 static const char *cpu_name[] = {
322 [CPU_SH7203] = "SH7203", [CPU_SH7263] = "SH7263",
323 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619",
324 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706",
325 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708",
326 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710",
327 [CPU_SH7712] = "SH7712", [CPU_SH7720] = "SH7720",
328 [CPU_SH7721] = "SH7721", [CPU_SH7729] = "SH7729",
329 [CPU_SH7750] = "SH7750", [CPU_SH7750S] = "SH7750S",
330 [CPU_SH7750R] = "SH7750R", [CPU_SH7751] = "SH7751",
331 [CPU_SH7751R] = "SH7751R", [CPU_SH7760] = "SH7760",
332 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501",
333 [CPU_SH7763] = "SH7763", [CPU_SH7770] = "SH7770",
334 [CPU_SH7780] = "SH7780", [CPU_SH7781] = "SH7781",
335 [CPU_SH7343] = "SH7343", [CPU_SH7785] = "SH7785",
336 [CPU_SH7722] = "SH7722", [CPU_SHX3] = "SH-X3",
337 [CPU_SH5_101] = "SH5-101", [CPU_SH5_103] = "SH5-103",
338 [CPU_MXG] = "MX-G", [CPU_SH7723] = "SH7723",
339 [CPU_SH7366] = "SH7366", [CPU_SH_NONE] = "Unknown"
342 const char *get_cpu_subtype(struct sh_cpuinfo *c)
344 return cpu_name[c->type];
347 #ifdef CONFIG_PROC_FS
348 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
349 static const char *cpu_flags[] = {
350 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
351 "ptea", "llsc", "l2", "op32", NULL
354 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
356 unsigned long i;
358 seq_printf(m, "cpu flags\t:");
360 if (!c->flags) {
361 seq_printf(m, " %s\n", cpu_flags[0]);
362 return;
365 for (i = 0; cpu_flags[i]; i++)
366 if ((c->flags & (1 << i)))
367 seq_printf(m, " %s", cpu_flags[i+1]);
369 seq_printf(m, "\n");
372 static void show_cacheinfo(struct seq_file *m, const char *type,
373 struct cache_info info)
375 unsigned int cache_size;
377 cache_size = info.ways * info.sets * info.linesz;
379 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
380 type, cache_size >> 10, info.ways);
384 * Get CPU information for use by the procfs.
386 static int show_cpuinfo(struct seq_file *m, void *v)
388 struct sh_cpuinfo *c = v;
389 unsigned int cpu = c - cpu_data;
391 if (!cpu_online(cpu))
392 return 0;
394 if (cpu == 0)
395 seq_printf(m, "machine\t\t: %s\n", get_system_type());
397 seq_printf(m, "processor\t: %d\n", cpu);
398 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
399 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
401 show_cpuflags(m, c);
403 seq_printf(m, "cache type\t: ");
406 * Check for what type of cache we have, we support both the
407 * unified cache on the SH-2 and SH-3, as well as the harvard
408 * style cache on the SH-4.
410 if (c->icache.flags & SH_CACHE_COMBINED) {
411 seq_printf(m, "unified\n");
412 show_cacheinfo(m, "cache", c->icache);
413 } else {
414 seq_printf(m, "split (harvard)\n");
415 show_cacheinfo(m, "icache", c->icache);
416 show_cacheinfo(m, "dcache", c->dcache);
419 /* Optional secondary cache */
420 if (c->flags & CPU_HAS_L2_CACHE)
421 show_cacheinfo(m, "scache", c->scache);
423 seq_printf(m, "bogomips\t: %lu.%02lu\n",
424 c->loops_per_jiffy/(500000/HZ),
425 (c->loops_per_jiffy/(5000/HZ)) % 100);
427 return 0;
430 static void *c_start(struct seq_file *m, loff_t *pos)
432 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
434 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
436 ++*pos;
437 return c_start(m, pos);
439 static void c_stop(struct seq_file *m, void *v)
442 const struct seq_operations cpuinfo_op = {
443 .start = c_start,
444 .next = c_next,
445 .stop = c_stop,
446 .show = show_cpuinfo,
448 #endif /* CONFIG_PROC_FS */
450 struct dentry *sh_debugfs_root;
452 static int __init sh_debugfs_init(void)
454 sh_debugfs_root = debugfs_create_dir("sh", NULL);
455 if (IS_ERR(sh_debugfs_root))
456 return PTR_ERR(sh_debugfs_root);
458 return 0;
460 arch_initcall(sh_debugfs_init);