sh: Add support for SH7763 CPU subtype.
[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/elf.h>
30 #include <asm/sections.h>
31 #include <asm/irq.h>
32 #include <asm/setup.h>
33 #include <asm/clock.h>
34 #include <asm/mmu_context.h>
35
36 /*
37  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
38  * This value will be used at the very early stage of serial setup.
39  * The bigger value means no problem.
40  */
41 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
42         [0] = {
43                 .type                   = CPU_SH_NONE,
44                 .loops_per_jiffy        = 10000000,
45         },
46 };
47 EXPORT_SYMBOL(cpu_data);
48
49 /*
50  * The machine vector. First entry in .machvec.init, or clobbered by
51  * sh_mv= on the command line, prior to .machvec.init teardown.
52  */
53 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
54
55 #ifdef CONFIG_VT
56 struct screen_info screen_info;
57 #endif
58
59 extern int root_mountflags;
60
61 #define RAMDISK_IMAGE_START_MASK        0x07FF
62 #define RAMDISK_PROMPT_FLAG             0x8000
63 #define RAMDISK_LOAD_FLAG               0x4000
64
65 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
66
67 static struct resource code_resource = {
68         .name = "Kernel code",
69         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
70 };
71
72 static struct resource data_resource = {
73         .name = "Kernel data",
74         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
75 };
76
77 unsigned long memory_start;
78 EXPORT_SYMBOL(memory_start);
79 unsigned long memory_end = 0;
80 EXPORT_SYMBOL(memory_end);
81
82 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
83
84 static int __init early_parse_mem(char *p)
85 {
86         unsigned long size;
87
88         memory_start = (unsigned long)__va(__MEMORY_START);
89         size = memparse(p, &p);
90
91         if (size > __MEMORY_SIZE) {
92                 static char msg[] __initdata = KERN_ERR
93                         "Using mem= to increase the size of kernel memory "
94                         "is not allowed.\n"
95                         "  Recompile the kernel with the correct value for "
96                         "CONFIG_MEMORY_SIZE.\n";
97                 printk(msg);
98                 return 0;
99         }
100
101         memory_end = memory_start + size;
102
103         return 0;
104 }
105 early_param("mem", early_parse_mem);
106
107 /*
108  * Register fully available low RAM pages with the bootmem allocator.
109  */
110 static void __init register_bootmem_low_pages(void)
111 {
112         unsigned long curr_pfn, last_pfn, pages;
113
114         /*
115          * We are rounding up the start address of usable memory:
116          */
117         curr_pfn = PFN_UP(__MEMORY_START);
118
119         /*
120          * ... and at the end of the usable range downwards:
121          */
122         last_pfn = PFN_DOWN(__pa(memory_end));
123
124         if (last_pfn > max_low_pfn)
125                 last_pfn = max_low_pfn;
126
127         pages = last_pfn - curr_pfn;
128         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
129 }
130
131 #ifdef CONFIG_KEXEC
132 static void __init reserve_crashkernel(void)
133 {
134         unsigned long long free_mem;
135         unsigned long long crash_size, crash_base;
136         int ret;
137
138         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
139
140         ret = parse_crashkernel(boot_command_line, free_mem,
141                         &crash_size, &crash_base);
142         if (ret == 0 && crash_size) {
143                 if (crash_base > 0) {
144                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
145                                         "for crashkernel (System RAM: %ldMB)\n",
146                                         (unsigned long)(crash_size >> 20),
147                                         (unsigned long)(crash_base >> 20),
148                                         (unsigned long)(free_mem >> 20));
149                         crashk_res.start = crash_base;
150                         crashk_res.end   = crash_base + crash_size - 1;
151                         reserve_bootmem(crash_base, crash_size);
152                 } else
153                         printk(KERN_INFO "crashkernel reservation failed - "
154                                         "you have to specify a base address\n");
155         }
156 }
157 #else
158 static inline void __init reserve_crashkernel(void)
159 {}
160 #endif
161
162 void __init setup_bootmem_allocator(unsigned long free_pfn)
163 {
164         unsigned long bootmap_size;
165
166         /*
167          * Find a proper area for the bootmem bitmap. After this
168          * bootstrap step all allocations (until the page allocator
169          * is intact) must be done via bootmem_alloc().
170          */
171         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
172                                          min_low_pfn, max_low_pfn);
173
174         add_active_range(0, min_low_pfn, max_low_pfn);
175         register_bootmem_low_pages();
176
177         node_set_online(0);
178
179         /*
180          * Reserve the kernel text and
181          * Reserve the bootmem bitmap. We do this in two steps (first step
182          * was init_bootmem()), because this catches the (definitely buggy)
183          * case of us accidentally initializing the bootmem allocator with
184          * an invalid RAM area.
185          */
186         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
187                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
188
189         /*
190          * reserve physical page 0 - it's a special BIOS page on many boxes,
191          * enabling clean reboots, SMP operation, laptop functions.
192          */
193         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
194
195         sparse_memory_present_with_active_regions(0);
196
197 #ifdef CONFIG_BLK_DEV_INITRD
198         ROOT_DEV = Root_RAM0;
199
200         if (LOADER_TYPE && INITRD_START) {
201                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
202                         reserve_bootmem(INITRD_START + __MEMORY_START,
203                                         INITRD_SIZE);
204                         initrd_start = INITRD_START + PAGE_OFFSET +
205                                         __MEMORY_START;
206                         initrd_end = initrd_start + INITRD_SIZE;
207                 } else {
208                         printk("initrd extends beyond end of memory "
209                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
210                                     INITRD_START + INITRD_SIZE,
211                                     max_low_pfn << PAGE_SHIFT);
212                         initrd_start = 0;
213                 }
214         }
215 #endif
216
217         reserve_crashkernel();
218 }
219
220 #ifndef CONFIG_NEED_MULTIPLE_NODES
221 static void __init setup_memory(void)
222 {
223         unsigned long start_pfn;
224
225         /*
226          * Partially used pages are not usable - thus
227          * we are rounding upwards:
228          */
229         start_pfn = PFN_UP(__pa(_end));
230         setup_bootmem_allocator(start_pfn);
231 }
232 #else
233 extern void __init setup_memory(void);
234 #endif
235
236 void __init setup_arch(char **cmdline_p)
237 {
238         enable_mmu();
239
240         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
241
242 #ifdef CONFIG_BLK_DEV_RAM
243         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
244         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
245         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
246 #endif
247
248         if (!MOUNT_ROOT_RDONLY)
249                 root_mountflags &= ~MS_RDONLY;
250         init_mm.start_code = (unsigned long) _text;
251         init_mm.end_code = (unsigned long) _etext;
252         init_mm.end_data = (unsigned long) _edata;
253         init_mm.brk = (unsigned long) _end;
254
255         code_resource.start = virt_to_phys(_text);
256         code_resource.end = virt_to_phys(_etext)-1;
257         data_resource.start = virt_to_phys(_etext);
258         data_resource.end = virt_to_phys(_edata)-1;
259
260         memory_start = (unsigned long)__va(__MEMORY_START);
261         if (!memory_end)
262                 memory_end = memory_start + __MEMORY_SIZE;
263
264 #ifdef CONFIG_CMDLINE_BOOL
265         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
266 #else
267         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
268 #endif
269
270         /* Save unparsed command line copy for /proc/cmdline */
271         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
272         *cmdline_p = command_line;
273
274         parse_early_param();
275
276         sh_mv_setup();
277
278         /*
279          * Find the highest page frame number we have available
280          */
281         max_pfn = PFN_DOWN(__pa(memory_end));
282
283         /*
284          * Determine low and high memory ranges:
285          */
286         max_low_pfn = max_pfn;
287         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
288
289         nodes_clear(node_online_map);
290
291         /* Setup bootmem with available RAM */
292         setup_memory();
293         sparse_init();
294
295 #ifdef CONFIG_DUMMY_CONSOLE
296         conswitchp = &dummy_con;
297 #endif
298
299         /* Perform the machine specific initialisation */
300         if (likely(sh_mv.mv_setup))
301                 sh_mv.mv_setup(cmdline_p);
302
303         paging_init();
304
305 #ifdef CONFIG_SMP
306         plat_smp_setup();
307 #endif
308 }
309
310 static const char *cpu_name[] = {
311         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
312         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
313         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
314         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
315         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
316         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
317         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
318         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
319         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
320         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
321         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
322         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
323         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
324         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
325         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
326         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
327         [CPU_SH_NONE]   = "Unknown"
328 };
329
330 const char *get_cpu_subtype(struct sh_cpuinfo *c)
331 {
332         return cpu_name[c->type];
333 }
334
335 #ifdef CONFIG_PROC_FS
336 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
337 static const char *cpu_flags[] = {
338         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
339         "ptea", "llsc", "l2", "op32", NULL
340 };
341
342 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
343 {
344         unsigned long i;
345
346         seq_printf(m, "cpu flags\t:");
347
348         if (!c->flags) {
349                 seq_printf(m, " %s\n", cpu_flags[0]);
350                 return;
351         }
352
353         for (i = 0; cpu_flags[i]; i++)
354                 if ((c->flags & (1 << i)))
355                         seq_printf(m, " %s", cpu_flags[i+1]);
356
357         seq_printf(m, "\n");
358 }
359
360 static void show_cacheinfo(struct seq_file *m, const char *type,
361                            struct cache_info info)
362 {
363         unsigned int cache_size;
364
365         cache_size = info.ways * info.sets * info.linesz;
366
367         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
368                    type, cache_size >> 10, info.ways);
369 }
370
371 /*
372  *      Get CPU information for use by the procfs.
373  */
374 static int show_cpuinfo(struct seq_file *m, void *v)
375 {
376         struct sh_cpuinfo *c = v;
377         unsigned int cpu = c - cpu_data;
378
379         if (!cpu_online(cpu))
380                 return 0;
381
382         if (cpu == 0)
383                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
384
385         seq_printf(m, "processor\t: %d\n", cpu);
386         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
387         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
388
389         show_cpuflags(m, c);
390
391         seq_printf(m, "cache type\t: ");
392
393         /*
394          * Check for what type of cache we have, we support both the
395          * unified cache on the SH-2 and SH-3, as well as the harvard
396          * style cache on the SH-4.
397          */
398         if (c->icache.flags & SH_CACHE_COMBINED) {
399                 seq_printf(m, "unified\n");
400                 show_cacheinfo(m, "cache", c->icache);
401         } else {
402                 seq_printf(m, "split (harvard)\n");
403                 show_cacheinfo(m, "icache", c->icache);
404                 show_cacheinfo(m, "dcache", c->dcache);
405         }
406
407         /* Optional secondary cache */
408         if (c->flags & CPU_HAS_L2_CACHE)
409                 show_cacheinfo(m, "scache", c->scache);
410
411         seq_printf(m, "bogomips\t: %lu.%02lu\n",
412                      c->loops_per_jiffy/(500000/HZ),
413                      (c->loops_per_jiffy/(5000/HZ)) % 100);
414
415         return 0;
416 }
417
418 static void *c_start(struct seq_file *m, loff_t *pos)
419 {
420         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
421 }
422 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
423 {
424         ++*pos;
425         return c_start(m, pos);
426 }
427 static void c_stop(struct seq_file *m, void *v)
428 {
429 }
430 struct seq_operations cpuinfo_op = {
431         .start  = c_start,
432         .next   = c_next,
433         .stop   = c_stop,
434         .show   = show_cpuinfo,
435 };
436 #endif /* CONFIG_PROC_FS */