Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / 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 <asm/uaccess.h>
27 #include <asm/io.h>
28 #include <asm/page.h>
29 #include <asm/sections.h>
30 #include <asm/irq.h>
31 #include <asm/setup.h>
32 #include <asm/clock.h>
33 #include <asm/mmu_context.h>
34
35 /*
36  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
37  * This value will be used at the very early stage of serial setup.
38  * The bigger value means no problem.
39  */
40 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
41         [0] = {
42                 .type                   = CPU_SH_NONE,
43                 .loops_per_jiffy        = 10000000,
44         },
45 };
46 EXPORT_SYMBOL(cpu_data);
47
48 /*
49  * The machine vector. First entry in .machvec.init, or clobbered by
50  * sh_mv= on the command line, prior to .machvec.init teardown.
51  */
52 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
53
54 #ifdef CONFIG_VT
55 struct screen_info screen_info;
56 #endif
57
58 extern int root_mountflags;
59
60 #define RAMDISK_IMAGE_START_MASK        0x07FF
61 #define RAMDISK_PROMPT_FLAG             0x8000
62 #define RAMDISK_LOAD_FLAG               0x4000
63
64 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
65
66 static struct resource code_resource = {
67         .name = "Kernel code",
68         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
69 };
70
71 static struct resource data_resource = {
72         .name = "Kernel data",
73         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
74 };
75
76 unsigned long memory_start;
77 EXPORT_SYMBOL(memory_start);
78 unsigned long memory_end = 0;
79 EXPORT_SYMBOL(memory_end);
80
81 static int __init early_parse_mem(char *p)
82 {
83         unsigned long size;
84
85         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
86         size = memparse(p, &p);
87         memory_end = memory_start + size;
88
89         return 0;
90 }
91 early_param("mem", early_parse_mem);
92
93 /*
94  * Register fully available low RAM pages with the bootmem allocator.
95  */
96 static void __init register_bootmem_low_pages(void)
97 {
98         unsigned long curr_pfn, last_pfn, pages;
99
100         /*
101          * We are rounding up the start address of usable memory:
102          */
103         curr_pfn = PFN_UP(__MEMORY_START);
104
105         /*
106          * ... and at the end of the usable range downwards:
107          */
108         last_pfn = PFN_DOWN(__pa(memory_end));
109
110         if (last_pfn > max_low_pfn)
111                 last_pfn = max_low_pfn;
112
113         pages = last_pfn - curr_pfn;
114         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
115 }
116
117 #ifdef CONFIG_KEXEC
118 static void __init reserve_crashkernel(void)
119 {
120         unsigned long long free_mem;
121         unsigned long long crash_size, crash_base;
122         int ret;
123
124         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
125
126         ret = parse_crashkernel(boot_command_line, free_mem,
127                         &crash_size, &crash_base);
128         if (ret == 0 && crash_size) {
129                 if (crash_base > 0) {
130                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
131                                         "for crashkernel (System RAM: %ldMB)\n",
132                                         (unsigned long)(crash_size >> 20),
133                                         (unsigned long)(crash_base >> 20),
134                                         (unsigned long)(free_mem >> 20));
135                         crashk_res.start = crash_base;
136                         crashk_res.end   = crash_base + crash_size - 1;
137                         reserve_bootmem(crash_base, crash_size);
138                 } else
139                         printk(KERN_INFO "crashkernel reservation failed - "
140                                         "you have to specify a base address\n");
141         }
142 }
143 #else
144 static inline void __init reserve_crashkernel(void)
145 {}
146 #endif
147
148 void __init setup_bootmem_allocator(unsigned long free_pfn)
149 {
150         unsigned long bootmap_size;
151
152         /*
153          * Find a proper area for the bootmem bitmap. After this
154          * bootstrap step all allocations (until the page allocator
155          * is intact) must be done via bootmem_alloc().
156          */
157         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
158                                          min_low_pfn, max_low_pfn);
159
160         add_active_range(0, min_low_pfn, max_low_pfn);
161         register_bootmem_low_pages();
162
163         node_set_online(0);
164
165         /*
166          * Reserve the kernel text and
167          * Reserve the bootmem bitmap. We do this in two steps (first step
168          * was init_bootmem()), because this catches the (definitely buggy)
169          * case of us accidentally initializing the bootmem allocator with
170          * an invalid RAM area.
171          */
172         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
173                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
174
175         /*
176          * reserve physical page 0 - it's a special BIOS page on many boxes,
177          * enabling clean reboots, SMP operation, laptop functions.
178          */
179         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
180
181         sparse_memory_present_with_active_regions(0);
182
183 #ifdef CONFIG_BLK_DEV_INITRD
184         ROOT_DEV = Root_RAM0;
185
186         if (LOADER_TYPE && INITRD_START) {
187                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
188                         reserve_bootmem(INITRD_START + __MEMORY_START,
189                                         INITRD_SIZE);
190                         initrd_start = INITRD_START + PAGE_OFFSET +
191                                         __MEMORY_START;
192                         initrd_end = initrd_start + INITRD_SIZE;
193                 } else {
194                         printk("initrd extends beyond end of memory "
195                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
196                                     INITRD_START + INITRD_SIZE,
197                                     max_low_pfn << PAGE_SHIFT);
198                         initrd_start = 0;
199                 }
200         }
201 #endif
202
203         reserve_crashkernel();
204 }
205
206 #ifndef CONFIG_NEED_MULTIPLE_NODES
207 static void __init setup_memory(void)
208 {
209         unsigned long start_pfn;
210
211         /*
212          * Partially used pages are not usable - thus
213          * we are rounding upwards:
214          */
215         start_pfn = PFN_UP(__pa(_end));
216         setup_bootmem_allocator(start_pfn);
217 }
218 #else
219 extern void __init setup_memory(void);
220 #endif
221
222 void __init setup_arch(char **cmdline_p)
223 {
224         enable_mmu();
225
226         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
227
228 #ifdef CONFIG_BLK_DEV_RAM
229         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
230         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
231         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
232 #endif
233
234         if (!MOUNT_ROOT_RDONLY)
235                 root_mountflags &= ~MS_RDONLY;
236         init_mm.start_code = (unsigned long) _text;
237         init_mm.end_code = (unsigned long) _etext;
238         init_mm.end_data = (unsigned long) _edata;
239         init_mm.brk = (unsigned long) _end;
240
241         code_resource.start = virt_to_phys(_text);
242         code_resource.end = virt_to_phys(_etext)-1;
243         data_resource.start = virt_to_phys(_etext);
244         data_resource.end = virt_to_phys(_edata)-1;
245
246         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
247         if (!memory_end)
248                 memory_end = memory_start + __MEMORY_SIZE;
249
250 #ifdef CONFIG_CMDLINE_BOOL
251         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
252 #else
253         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
254 #endif
255
256         /* Save unparsed command line copy for /proc/cmdline */
257         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
258         *cmdline_p = command_line;
259
260         parse_early_param();
261
262         sh_mv_setup();
263
264         /*
265          * Find the highest page frame number we have available
266          */
267         max_pfn = PFN_DOWN(__pa(memory_end));
268
269         /*
270          * Determine low and high memory ranges:
271          */
272         max_low_pfn = max_pfn;
273         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
274
275         nodes_clear(node_online_map);
276
277         /* Setup bootmem with available RAM */
278         setup_memory();
279         sparse_init();
280
281 #ifdef CONFIG_DUMMY_CONSOLE
282         conswitchp = &dummy_con;
283 #endif
284
285         /* Perform the machine specific initialisation */
286         if (likely(sh_mv.mv_setup))
287                 sh_mv.mv_setup(cmdline_p);
288
289         paging_init();
290
291 #ifdef CONFIG_SMP
292         plat_smp_setup();
293 #endif
294 }
295
296 static const char *cpu_name[] = {
297         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
298         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
299         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
300         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
301         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
302         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
303         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
304         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
305         [CPU_SH7760]    = "SH7760",
306         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
307         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
308         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
309         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
310         [CPU_SHX3]      = "SH-X3",      [CPU_SH_NONE]   = "Unknown"
311 };
312
313 const char *get_cpu_subtype(struct sh_cpuinfo *c)
314 {
315         return cpu_name[c->type];
316 }
317
318 #ifdef CONFIG_PROC_FS
319 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
320 static const char *cpu_flags[] = {
321         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
322         "ptea", "llsc", "l2", "op32", NULL
323 };
324
325 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
326 {
327         unsigned long i;
328
329         seq_printf(m, "cpu flags\t:");
330
331         if (!c->flags) {
332                 seq_printf(m, " %s\n", cpu_flags[0]);
333                 return;
334         }
335
336         for (i = 0; cpu_flags[i]; i++)
337                 if ((c->flags & (1 << i)))
338                         seq_printf(m, " %s", cpu_flags[i+1]);
339
340         seq_printf(m, "\n");
341 }
342
343 static void show_cacheinfo(struct seq_file *m, const char *type,
344                            struct cache_info info)
345 {
346         unsigned int cache_size;
347
348         cache_size = info.ways * info.sets * info.linesz;
349
350         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
351                    type, cache_size >> 10, info.ways);
352 }
353
354 /*
355  *      Get CPU information for use by the procfs.
356  */
357 static int show_cpuinfo(struct seq_file *m, void *v)
358 {
359         struct sh_cpuinfo *c = v;
360         unsigned int cpu = c - cpu_data;
361
362         if (!cpu_online(cpu))
363                 return 0;
364
365         if (cpu == 0)
366                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
367
368         seq_printf(m, "processor\t: %d\n", cpu);
369         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
370         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
371
372         show_cpuflags(m, c);
373
374         seq_printf(m, "cache type\t: ");
375
376         /*
377          * Check for what type of cache we have, we support both the
378          * unified cache on the SH-2 and SH-3, as well as the harvard
379          * style cache on the SH-4.
380          */
381         if (c->icache.flags & SH_CACHE_COMBINED) {
382                 seq_printf(m, "unified\n");
383                 show_cacheinfo(m, "cache", c->icache);
384         } else {
385                 seq_printf(m, "split (harvard)\n");
386                 show_cacheinfo(m, "icache", c->icache);
387                 show_cacheinfo(m, "dcache", c->dcache);
388         }
389
390         /* Optional secondary cache */
391         if (c->flags & CPU_HAS_L2_CACHE)
392                 show_cacheinfo(m, "scache", c->scache);
393
394         seq_printf(m, "bogomips\t: %lu.%02lu\n",
395                      c->loops_per_jiffy/(500000/HZ),
396                      (c->loops_per_jiffy/(5000/HZ)) % 100);
397
398         return 0;
399 }
400
401 static void *c_start(struct seq_file *m, loff_t *pos)
402 {
403         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
404 }
405 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
406 {
407         ++*pos;
408         return c_start(m, pos);
409 }
410 static void c_stop(struct seq_file *m, void *v)
411 {
412 }
413 struct seq_operations cpuinfo_op = {
414         .start  = c_start,
415         .next   = c_next,
416         .stop   = c_stop,
417         .show   = show_cpuinfo,
418 };
419 #endif /* CONFIG_PROC_FS */