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[linux-2.6-omap-h63xx.git] / arch / sh / kernel / setup.c
1 /*
2  * arch/sh/kernel/setup.c
3  *
4  * This file handles the architecture-dependent parts of initialization
5  *
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 <linux/crash_dump.h>
29 #include <asm/uaccess.h>
30 #include <asm/io.h>
31 #include <asm/page.h>
32 #include <asm/elf.h>
33 #include <asm/sections.h>
34 #include <asm/irq.h>
35 #include <asm/setup.h>
36 #include <asm/clock.h>
37 #include <asm/mmu_context.h>
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  */
44 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
45         [0] = {
46                 .type                   = CPU_SH_NONE,
47                 .loops_per_jiffy        = 10000000,
48         },
49 };
50 EXPORT_SYMBOL(cpu_data);
51
52 /*
53  * The machine vector. First entry in .machvec.init, or clobbered by
54  * sh_mv= on the command line, prior to .machvec.init teardown.
55  */
56 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
57 EXPORT_SYMBOL(sh_mv);
58
59 #ifdef CONFIG_VT
60 struct screen_info screen_info;
61 #endif
62
63 extern int root_mountflags;
64
65 #define RAMDISK_IMAGE_START_MASK        0x07FF
66 #define RAMDISK_PROMPT_FLAG             0x8000
67 #define RAMDISK_LOAD_FLAG               0x4000
68
69 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
70
71 static struct resource code_resource = {
72         .name = "Kernel code",
73         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
74 };
75
76 static struct resource data_resource = {
77         .name = "Kernel data",
78         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
79 };
80
81 static struct resource bss_resource = {
82         .name   = "Kernel bss",
83         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
84 };
85
86 unsigned long memory_start;
87 EXPORT_SYMBOL(memory_start);
88 unsigned long memory_end = 0;
89 EXPORT_SYMBOL(memory_end);
90
91 static struct resource mem_resources[MAX_NUMNODES];
92
93 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
94
95 static int __init early_parse_mem(char *p)
96 {
97         unsigned long size;
98
99         memory_start = (unsigned long)__va(__MEMORY_START);
100         size = memparse(p, &p);
101
102         if (size > __MEMORY_SIZE) {
103                 static char msg[] __initdata = KERN_ERR
104                         "Using mem= to increase the size of kernel memory "
105                         "is not allowed.\n"
106                         "  Recompile the kernel with the correct value for "
107                         "CONFIG_MEMORY_SIZE.\n";
108                 printk(msg);
109                 return 0;
110         }
111
112         memory_end = memory_start + size;
113
114         return 0;
115 }
116 early_param("mem", early_parse_mem);
117
118 /*
119  * Register fully available low RAM pages with the bootmem allocator.
120  */
121 static void __init register_bootmem_low_pages(void)
122 {
123         unsigned long curr_pfn, last_pfn, pages;
124
125         /*
126          * We are rounding up the start address of usable memory:
127          */
128         curr_pfn = PFN_UP(__MEMORY_START);
129
130         /*
131          * ... and at the end of the usable range downwards:
132          */
133         last_pfn = PFN_DOWN(__pa(memory_end));
134
135         if (last_pfn > max_low_pfn)
136                 last_pfn = max_low_pfn;
137
138         pages = last_pfn - curr_pfn;
139         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
140 }
141
142 #ifdef CONFIG_KEXEC
143 static void __init reserve_crashkernel(void)
144 {
145         unsigned long long free_mem;
146         unsigned long long crash_size, crash_base;
147         int ret;
148
149         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
150
151         ret = parse_crashkernel(boot_command_line, free_mem,
152                         &crash_size, &crash_base);
153         if (ret == 0 && crash_size) {
154                 if (crash_base <= 0) {
155                         printk(KERN_INFO "crashkernel reservation failed - "
156                                         "you have to specify a base address\n");
157                         return;
158                 }
159
160                 if (reserve_bootmem(crash_base, crash_size,
161                                         BOOTMEM_EXCLUSIVE) < 0) {
162                         printk(KERN_INFO "crashkernel reservation failed - "
163                                         "memory is in use\n");
164                         return;
165                 }
166
167                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
168                                 "for crashkernel (System RAM: %ldMB)\n",
169                                 (unsigned long)(crash_size >> 20),
170                                 (unsigned long)(crash_base >> 20),
171                                 (unsigned long)(free_mem >> 20));
172                 crashk_res.start = crash_base;
173                 crashk_res.end   = crash_base + crash_size - 1;
174                 insert_resource(&iomem_resource, &crashk_res);
175         }
176 }
177 #else
178 static inline void __init reserve_crashkernel(void)
179 {}
180 #endif
181
182 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
183                                                 unsigned long end_pfn)
184 {
185         struct resource *res = &mem_resources[nid];
186
187         WARN_ON(res->name); /* max one active range per node for now */
188
189         res->name = "System RAM";
190         res->start = start_pfn << PAGE_SHIFT;
191         res->end = (end_pfn << PAGE_SHIFT) - 1;
192         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
193         if (request_resource(&iomem_resource, res)) {
194                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
195                        start_pfn, end_pfn);
196                 return;
197         }
198
199         /*
200          *  We don't know which RAM region contains kernel data,
201          *  so we try it repeatedly and let the resource manager
202          *  test it.
203          */
204         request_resource(res, &code_resource);
205         request_resource(res, &data_resource);
206         request_resource(res, &bss_resource);
207
208         add_active_range(nid, start_pfn, end_pfn);
209 }
210
211 void __init setup_bootmem_allocator(unsigned long free_pfn)
212 {
213         unsigned long bootmap_size;
214
215         /*
216          * Find a proper area for the bootmem bitmap. After this
217          * bootstrap step all allocations (until the page allocator
218          * is intact) must be done via bootmem_alloc().
219          */
220         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
221                                          min_low_pfn, max_low_pfn);
222
223         __add_active_range(0, min_low_pfn, max_low_pfn);
224         register_bootmem_low_pages();
225
226         node_set_online(0);
227
228         /*
229          * Reserve the kernel text and
230          * Reserve the bootmem bitmap. We do this in two steps (first step
231          * was init_bootmem()), because this catches the (definitely buggy)
232          * case of us accidentally initializing the bootmem allocator with
233          * an invalid RAM area.
234          */
235         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
236                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START,
237                 BOOTMEM_DEFAULT);
238
239         /*
240          * reserve physical page 0 - it's a special BIOS page on many boxes,
241          * enabling clean reboots, SMP operation, laptop functions.
242          */
243         reserve_bootmem(__MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
244
245         sparse_memory_present_with_active_regions(0);
246
247 #ifdef CONFIG_BLK_DEV_INITRD
248         ROOT_DEV = Root_RAM0;
249
250         if (LOADER_TYPE && INITRD_START) {
251                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
252                         reserve_bootmem(INITRD_START + __MEMORY_START,
253                                         INITRD_SIZE, BOOTMEM_DEFAULT);
254                         initrd_start = INITRD_START + PAGE_OFFSET +
255                                         __MEMORY_START;
256                         initrd_end = initrd_start + INITRD_SIZE;
257                 } else {
258                         printk("initrd extends beyond end of memory "
259                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
260                                     INITRD_START + INITRD_SIZE,
261                                     max_low_pfn << PAGE_SHIFT);
262                         initrd_start = 0;
263                 }
264         }
265 #endif
266
267         reserve_crashkernel();
268 }
269
270 #ifndef CONFIG_NEED_MULTIPLE_NODES
271 static void __init setup_memory(void)
272 {
273         unsigned long start_pfn;
274
275         /*
276          * Partially used pages are not usable - thus
277          * we are rounding upwards:
278          */
279         start_pfn = PFN_UP(__pa(_end));
280         setup_bootmem_allocator(start_pfn);
281 }
282 #else
283 extern void __init setup_memory(void);
284 #endif
285
286 /*
287  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
288  * is_kdump_kernel() to determine if we are booting after a panic. Hence
289  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
290  */
291 #ifdef CONFIG_CRASH_DUMP
292 /* elfcorehdr= specifies the location of elf core header
293  * stored by the crashed kernel.
294  */
295 static int __init parse_elfcorehdr(char *arg)
296 {
297         if (!arg)
298                 return -EINVAL;
299         elfcorehdr_addr = memparse(arg, &arg);
300         return 0;
301 }
302 early_param("elfcorehdr", parse_elfcorehdr);
303 #endif
304
305 void __init setup_arch(char **cmdline_p)
306 {
307         enable_mmu();
308
309         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
310
311         printk(KERN_NOTICE "Boot params:\n"
312                            "... MOUNT_ROOT_RDONLY - %08lx\n"
313                            "... RAMDISK_FLAGS     - %08lx\n"
314                            "... ORIG_ROOT_DEV     - %08lx\n"
315                            "... LOADER_TYPE       - %08lx\n"
316                            "... INITRD_START      - %08lx\n"
317                            "... INITRD_SIZE       - %08lx\n",
318                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
319                            ORIG_ROOT_DEV, LOADER_TYPE,
320                            INITRD_START, INITRD_SIZE);
321
322 #ifdef CONFIG_BLK_DEV_RAM
323         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
324         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
325         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
326 #endif
327
328         if (!MOUNT_ROOT_RDONLY)
329                 root_mountflags &= ~MS_RDONLY;
330         init_mm.start_code = (unsigned long) _text;
331         init_mm.end_code = (unsigned long) _etext;
332         init_mm.end_data = (unsigned long) _edata;
333         init_mm.brk = (unsigned long) _end;
334
335         code_resource.start = virt_to_phys(_text);
336         code_resource.end = virt_to_phys(_etext)-1;
337         data_resource.start = virt_to_phys(_etext);
338         data_resource.end = virt_to_phys(_edata)-1;
339         bss_resource.start = virt_to_phys(__bss_start);
340         bss_resource.end = virt_to_phys(_ebss)-1;
341
342         memory_start = (unsigned long)__va(__MEMORY_START);
343         if (!memory_end)
344                 memory_end = memory_start + __MEMORY_SIZE;
345
346 #ifdef CONFIG_CMDLINE_BOOL
347         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
348 #else
349         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
350 #endif
351
352         /* Save unparsed command line copy for /proc/cmdline */
353         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
354         *cmdline_p = command_line;
355
356         parse_early_param();
357
358         sh_mv_setup();
359
360         /*
361          * Find the highest page frame number we have available
362          */
363         max_pfn = PFN_DOWN(__pa(memory_end));
364
365         /*
366          * Determine low and high memory ranges:
367          */
368         max_low_pfn = max_pfn;
369         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
370
371         nodes_clear(node_online_map);
372
373         /* Setup bootmem with available RAM */
374         setup_memory();
375         sparse_init();
376
377 #ifdef CONFIG_DUMMY_CONSOLE
378         conswitchp = &dummy_con;
379 #endif
380
381         /* Perform the machine specific initialisation */
382         if (likely(sh_mv.mv_setup))
383                 sh_mv.mv_setup(cmdline_p);
384
385         paging_init();
386
387 #ifdef CONFIG_SMP
388         plat_smp_setup();
389 #endif
390 }
391
392 static const char *cpu_name[] = {
393         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
394         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
395         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
396         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
397         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
398         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
399         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
400         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
401         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
402         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
403         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
404         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
405         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
406         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
407         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
408         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
409         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
410         [CPU_SH7366]    = "SH7366",     [CPU_SH_NONE]   = "Unknown"
411 };
412
413 const char *get_cpu_subtype(struct sh_cpuinfo *c)
414 {
415         return cpu_name[c->type];
416 }
417 EXPORT_SYMBOL(get_cpu_subtype);
418
419 #ifdef CONFIG_PROC_FS
420 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
421 static const char *cpu_flags[] = {
422         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
423         "ptea", "llsc", "l2", "op32", NULL
424 };
425
426 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
427 {
428         unsigned long i;
429
430         seq_printf(m, "cpu flags\t:");
431
432         if (!c->flags) {
433                 seq_printf(m, " %s\n", cpu_flags[0]);
434                 return;
435         }
436
437         for (i = 0; cpu_flags[i]; i++)
438                 if ((c->flags & (1 << i)))
439                         seq_printf(m, " %s", cpu_flags[i+1]);
440
441         seq_printf(m, "\n");
442 }
443
444 static void show_cacheinfo(struct seq_file *m, const char *type,
445                            struct cache_info info)
446 {
447         unsigned int cache_size;
448
449         cache_size = info.ways * info.sets * info.linesz;
450
451         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
452                    type, cache_size >> 10, info.ways);
453 }
454
455 /*
456  *      Get CPU information for use by the procfs.
457  */
458 static int show_cpuinfo(struct seq_file *m, void *v)
459 {
460         struct sh_cpuinfo *c = v;
461         unsigned int cpu = c - cpu_data;
462
463         if (!cpu_online(cpu))
464                 return 0;
465
466         if (cpu == 0)
467                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
468
469         seq_printf(m, "processor\t: %d\n", cpu);
470         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
471         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
472         if (c->cut_major == -1)
473                 seq_printf(m, "cut\t\t: unknown\n");
474         else if (c->cut_minor == -1)
475                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
476         else
477                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
478
479         show_cpuflags(m, c);
480
481         seq_printf(m, "cache type\t: ");
482
483         /*
484          * Check for what type of cache we have, we support both the
485          * unified cache on the SH-2 and SH-3, as well as the harvard
486          * style cache on the SH-4.
487          */
488         if (c->icache.flags & SH_CACHE_COMBINED) {
489                 seq_printf(m, "unified\n");
490                 show_cacheinfo(m, "cache", c->icache);
491         } else {
492                 seq_printf(m, "split (harvard)\n");
493                 show_cacheinfo(m, "icache", c->icache);
494                 show_cacheinfo(m, "dcache", c->dcache);
495         }
496
497         /* Optional secondary cache */
498         if (c->flags & CPU_HAS_L2_CACHE)
499                 show_cacheinfo(m, "scache", c->scache);
500
501         seq_printf(m, "bogomips\t: %lu.%02lu\n",
502                      c->loops_per_jiffy/(500000/HZ),
503                      (c->loops_per_jiffy/(5000/HZ)) % 100);
504
505         return 0;
506 }
507
508 static void *c_start(struct seq_file *m, loff_t *pos)
509 {
510         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
511 }
512 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
513 {
514         ++*pos;
515         return c_start(m, pos);
516 }
517 static void c_stop(struct seq_file *m, void *v)
518 {
519 }
520 const struct seq_operations cpuinfo_op = {
521         .start  = c_start,
522         .next   = c_next,
523         .stop   = c_stop,
524         .show   = show_cpuinfo,
525 };
526 #endif /* CONFIG_PROC_FS */
527
528 struct dentry *sh_debugfs_root;
529
530 static int __init sh_debugfs_init(void)
531 {
532         sh_debugfs_root = debugfs_create_dir("sh", NULL);
533         if (IS_ERR(sh_debugfs_root))
534                 return PTR_ERR(sh_debugfs_root);
535
536         return 0;
537 }
538 arch_initcall(sh_debugfs_init);