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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * arch/sh64/kernel/setup.c | |
7 | * | |
8 | * sh64 Arch Support | |
9 | * | |
10 | * This file handles the architecture-dependent parts of initialization | |
11 | * | |
12 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
13 | * Copyright (C) 2003, 2004 Paul Mundt | |
14 | * | |
15 | * benedict.gaster@superh.com: 2nd May 2002 | |
16 | * Modified to use the empty_zero_page to pass command line arguments. | |
17 | * | |
18 | * benedict.gaster@superh.com: 3rd May 2002 | |
19 | * Added support for ramdisk, removing statically linked romfs at the same time. | |
20 | * | |
21 | * lethal@linux-sh.org: 15th May 2003 | |
22 | * Added generic procfs cpuinfo reporting. Make boards just export their name. | |
23 | * | |
24 | * lethal@linux-sh.org: 25th May 2003 | |
25 | * Added generic get_cpu_subtype() for subtype reporting from cpu_data->type. | |
26 | * | |
27 | */ | |
28 | #include <linux/errno.h> | |
29 | #include <linux/rwsem.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/stddef.h> | |
34 | #include <linux/unistd.h> | |
35 | #include <linux/ptrace.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/user.h> | |
38 | #include <linux/a.out.h> | |
39 | #include <linux/tty.h> | |
40 | #include <linux/ioport.h> | |
41 | #include <linux/delay.h> | |
42 | #include <linux/config.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/seq_file.h> | |
45 | #include <linux/blkdev.h> | |
46 | #include <linux/bootmem.h> | |
47 | #include <linux/console.h> | |
48 | #include <linux/root_dev.h> | |
49 | #include <linux/cpu.h> | |
50 | #include <linux/initrd.h> | |
51 | #include <asm/processor.h> | |
52 | #include <asm/page.h> | |
53 | #include <asm/pgtable.h> | |
54 | #include <asm/platform.h> | |
55 | #include <asm/uaccess.h> | |
56 | #include <asm/system.h> | |
57 | #include <asm/io.h> | |
58 | #include <asm/sections.h> | |
59 | #include <asm/setup.h> | |
60 | #include <asm/smp.h> | |
61 | ||
62 | #ifdef CONFIG_VT | |
63 | #include <linux/console.h> | |
64 | #endif | |
65 | ||
66 | struct screen_info screen_info; | |
67 | ||
68 | #ifdef CONFIG_BLK_DEV_RAM | |
69 | extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */ | |
70 | extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */ | |
71 | extern int rd_image_start; /* starting block # of image */ | |
72 | #endif | |
73 | ||
74 | extern int root_mountflags; | |
75 | extern char *get_system_type(void); | |
76 | extern void platform_setup(void); | |
77 | extern void platform_monitor(void); | |
78 | extern void platform_reserve(void); | |
79 | extern int sh64_cache_init(void); | |
80 | extern int sh64_tlb_init(void); | |
81 | ||
82 | #define RAMDISK_IMAGE_START_MASK 0x07FF | |
83 | #define RAMDISK_PROMPT_FLAG 0x8000 | |
84 | #define RAMDISK_LOAD_FLAG 0x4000 | |
85 | ||
86 | static char command_line[COMMAND_LINE_SIZE] = { 0, }; | |
87 | unsigned long long memory_start = CONFIG_MEMORY_START; | |
88 | unsigned long long memory_end = CONFIG_MEMORY_START + (CONFIG_MEMORY_SIZE_IN_MB * 1024 * 1024); | |
89 | ||
90 | struct sh_cpuinfo boot_cpu_data; | |
91 | ||
92 | static inline void parse_mem_cmdline (char ** cmdline_p) | |
93 | { | |
94 | char c = ' ', *to = command_line, *from = COMMAND_LINE; | |
95 | int len = 0; | |
96 | ||
97 | /* Save unparsed command line copy for /proc/cmdline */ | |
98 | memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); | |
99 | saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; | |
100 | ||
101 | for (;;) { | |
102 | /* | |
103 | * "mem=XXX[kKmM]" defines a size of memory. | |
104 | */ | |
105 | if (c == ' ' && !memcmp(from, "mem=", 4)) { | |
106 | if (to != command_line) | |
107 | to--; | |
108 | { | |
109 | unsigned long mem_size; | |
110 | ||
111 | mem_size = memparse(from+4, &from); | |
112 | memory_end = memory_start + mem_size; | |
113 | } | |
114 | } | |
115 | c = *(from++); | |
116 | if (!c) | |
117 | break; | |
118 | if (COMMAND_LINE_SIZE <= ++len) | |
119 | break; | |
120 | *(to++) = c; | |
121 | } | |
122 | *to = '\0'; | |
123 | ||
124 | *cmdline_p = command_line; | |
125 | } | |
126 | ||
127 | static void __init sh64_cpu_type_detect(void) | |
128 | { | |
129 | extern unsigned long long peek_real_address_q(unsigned long long addr); | |
130 | unsigned long long cir; | |
131 | /* Do peeks in real mode to avoid having to set up a mapping for the | |
132 | WPC registers. On SH5-101 cut2, such a mapping would be exposed to | |
133 | an address translation erratum which would make it hard to set up | |
134 | correctly. */ | |
135 | cir = peek_real_address_q(0x0d000008); | |
136 | ||
137 | if ((cir & 0xffff) == 0x5103) { | |
138 | boot_cpu_data.type = CPU_SH5_103; | |
139 | } else if (((cir >> 32) & 0xffff) == 0x51e2) { | |
140 | /* CPU.VCR aliased at CIR address on SH5-101 */ | |
141 | boot_cpu_data.type = CPU_SH5_101; | |
142 | } else { | |
143 | boot_cpu_data.type = CPU_SH_NONE; | |
144 | } | |
145 | } | |
146 | ||
147 | void __init setup_arch(char **cmdline_p) | |
148 | { | |
149 | unsigned long bootmap_size, i; | |
150 | unsigned long first_pfn, start_pfn, last_pfn, pages; | |
151 | ||
152 | #ifdef CONFIG_EARLY_PRINTK | |
153 | extern void enable_early_printk(void); | |
154 | ||
155 | /* | |
156 | * Setup Early SCIF console | |
157 | */ | |
158 | enable_early_printk(); | |
159 | #endif | |
160 | ||
161 | /* | |
162 | * Setup TLB mappings | |
163 | */ | |
164 | sh64_tlb_init(); | |
165 | ||
166 | /* | |
167 | * Caches are already initialized by the time we get here, so we just | |
168 | * fill in cpu_data info for the caches. | |
169 | */ | |
170 | sh64_cache_init(); | |
171 | ||
172 | platform_setup(); | |
173 | platform_monitor(); | |
174 | ||
175 | sh64_cpu_type_detect(); | |
176 | ||
177 | ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); | |
178 | ||
179 | #ifdef CONFIG_BLK_DEV_RAM | |
180 | rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; | |
181 | rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); | |
182 | rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); | |
183 | #endif | |
184 | ||
185 | if (!MOUNT_ROOT_RDONLY) | |
186 | root_mountflags &= ~MS_RDONLY; | |
187 | init_mm.start_code = (unsigned long) _text; | |
188 | init_mm.end_code = (unsigned long) _etext; | |
189 | init_mm.end_data = (unsigned long) _edata; | |
190 | init_mm.brk = (unsigned long) _end; | |
191 | ||
192 | code_resource.start = __pa(_text); | |
193 | code_resource.end = __pa(_etext)-1; | |
194 | data_resource.start = __pa(_etext); | |
195 | data_resource.end = __pa(_edata)-1; | |
196 | ||
197 | parse_mem_cmdline(cmdline_p); | |
198 | ||
199 | /* | |
200 | * Find the lowest and highest page frame numbers we have available | |
201 | */ | |
202 | first_pfn = PFN_DOWN(memory_start); | |
203 | last_pfn = PFN_DOWN(memory_end); | |
204 | pages = last_pfn - first_pfn; | |
205 | ||
206 | /* | |
207 | * Partially used pages are not usable - thus | |
208 | * we are rounding upwards: | |
209 | */ | |
210 | start_pfn = PFN_UP(__pa(_end)); | |
211 | ||
212 | /* | |
213 | * Find a proper area for the bootmem bitmap. After this | |
214 | * bootstrap step all allocations (until the page allocator | |
215 | * is intact) must be done via bootmem_alloc(). | |
216 | */ | |
217 | bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn, | |
218 | first_pfn, | |
219 | last_pfn); | |
220 | /* | |
221 | * Round it up. | |
222 | */ | |
223 | bootmap_size = PFN_PHYS(PFN_UP(bootmap_size)); | |
224 | ||
225 | /* | |
226 | * Register fully available RAM pages with the bootmem allocator. | |
227 | */ | |
228 | free_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn), PFN_PHYS(pages)); | |
229 | ||
230 | /* | |
231 | * Reserve all kernel sections + bootmem bitmap + a guard page. | |
232 | */ | |
233 | reserve_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn), | |
234 | (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE) - PFN_PHYS(first_pfn)); | |
235 | ||
236 | /* | |
237 | * Reserve platform dependent sections | |
238 | */ | |
239 | platform_reserve(); | |
240 | ||
241 | #ifdef CONFIG_BLK_DEV_INITRD | |
242 | if (LOADER_TYPE && INITRD_START) { | |
243 | if (INITRD_START + INITRD_SIZE <= (PFN_PHYS(last_pfn))) { | |
244 | reserve_bootmem_node(NODE_DATA(0), INITRD_START + __MEMORY_START, INITRD_SIZE); | |
245 | ||
246 | initrd_start = | |
247 | (long) INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0; | |
248 | ||
249 | initrd_end = initrd_start + INITRD_SIZE; | |
250 | } else { | |
251 | printk("initrd extends beyond end of memory " | |
252 | "(0x%08lx > 0x%08lx)\ndisabling initrd\n", | |
253 | (long) INITRD_START + INITRD_SIZE, | |
254 | PFN_PHYS(last_pfn)); | |
255 | initrd_start = 0; | |
256 | } | |
257 | } | |
258 | #endif | |
259 | ||
260 | /* | |
261 | * Claim all RAM, ROM, and I/O resources. | |
262 | */ | |
263 | ||
264 | /* Kernel RAM */ | |
265 | request_resource(&iomem_resource, &code_resource); | |
266 | request_resource(&iomem_resource, &data_resource); | |
267 | ||
268 | /* Other KRAM space */ | |
269 | for (i = 0; i < STANDARD_KRAM_RESOURCES - 2; i++) | |
270 | request_resource(&iomem_resource, | |
271 | &platform_parms.kram_res_p[i]); | |
272 | ||
273 | /* XRAM space */ | |
274 | for (i = 0; i < STANDARD_XRAM_RESOURCES; i++) | |
275 | request_resource(&iomem_resource, | |
276 | &platform_parms.xram_res_p[i]); | |
277 | ||
278 | /* ROM space */ | |
279 | for (i = 0; i < STANDARD_ROM_RESOURCES; i++) | |
280 | request_resource(&iomem_resource, | |
281 | &platform_parms.rom_res_p[i]); | |
282 | ||
283 | /* I/O space */ | |
284 | for (i = 0; i < STANDARD_IO_RESOURCES; i++) | |
285 | request_resource(&ioport_resource, | |
286 | &platform_parms.io_res_p[i]); | |
287 | ||
288 | ||
289 | #ifdef CONFIG_VT | |
290 | #if defined(CONFIG_VGA_CONSOLE) | |
291 | conswitchp = &vga_con; | |
292 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
293 | conswitchp = &dummy_con; | |
294 | #endif | |
295 | #endif | |
296 | ||
297 | printk("Hardware FPU: %s\n", fpu_in_use ? "enabled" : "disabled"); | |
298 | ||
299 | paging_init(); | |
300 | } | |
301 | ||
302 | void __xchg_called_with_bad_pointer(void) | |
303 | { | |
304 | printk(KERN_EMERG "xchg() called with bad pointer !\n"); | |
305 | } | |
306 | ||
307 | static struct cpu cpu[1]; | |
308 | ||
309 | static int __init topology_init(void) | |
310 | { | |
311 | return register_cpu(cpu, 0, NULL); | |
312 | } | |
313 | ||
314 | subsys_initcall(topology_init); | |
315 | ||
316 | /* | |
317 | * Get CPU information | |
318 | */ | |
319 | static const char *cpu_name[] = { | |
320 | [CPU_SH5_101] = "SH5-101", | |
321 | [CPU_SH5_103] = "SH5-103", | |
322 | [CPU_SH_NONE] = "Unknown", | |
323 | }; | |
324 | ||
325 | const char *get_cpu_subtype(void) | |
326 | { | |
327 | return cpu_name[boot_cpu_data.type]; | |
328 | } | |
329 | ||
330 | #ifdef CONFIG_PROC_FS | |
331 | static int show_cpuinfo(struct seq_file *m,void *v) | |
332 | { | |
333 | unsigned int cpu = smp_processor_id(); | |
334 | ||
335 | if (!cpu) | |
336 | seq_printf(m, "machine\t\t: %s\n", get_system_type()); | |
337 | ||
338 | seq_printf(m, "processor\t: %d\n", cpu); | |
339 | seq_printf(m, "cpu family\t: SH-5\n"); | |
340 | seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype()); | |
341 | ||
342 | seq_printf(m, "icache size\t: %dK-bytes\n", | |
343 | (boot_cpu_data.icache.ways * | |
344 | boot_cpu_data.icache.sets * | |
345 | boot_cpu_data.icache.linesz) >> 10); | |
346 | seq_printf(m, "dcache size\t: %dK-bytes\n", | |
347 | (boot_cpu_data.dcache.ways * | |
348 | boot_cpu_data.dcache.sets * | |
349 | boot_cpu_data.dcache.linesz) >> 10); | |
350 | seq_printf(m, "itlb entries\t: %d\n", boot_cpu_data.itlb.entries); | |
351 | seq_printf(m, "dtlb entries\t: %d\n", boot_cpu_data.dtlb.entries); | |
352 | ||
353 | #define PRINT_CLOCK(name, value) \ | |
354 | seq_printf(m, name " clock\t: %d.%02dMHz\n", \ | |
355 | ((value) / 1000000), ((value) % 1000000)/10000) | |
356 | ||
357 | PRINT_CLOCK("cpu", boot_cpu_data.cpu_clock); | |
358 | PRINT_CLOCK("bus", boot_cpu_data.bus_clock); | |
359 | PRINT_CLOCK("module", boot_cpu_data.module_clock); | |
360 | ||
361 | seq_printf(m, "bogomips\t: %lu.%02lu\n\n", | |
362 | (loops_per_jiffy*HZ+2500)/500000, | |
363 | ((loops_per_jiffy*HZ+2500)/5000) % 100); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static void *c_start(struct seq_file *m, loff_t *pos) | |
369 | { | |
370 | return (void*)(*pos == 0); | |
371 | } | |
372 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
373 | { | |
374 | return NULL; | |
375 | } | |
376 | static void c_stop(struct seq_file *m, void *v) | |
377 | { | |
378 | } | |
379 | struct seq_operations cpuinfo_op = { | |
380 | .start = c_start, | |
381 | .next = c_next, | |
382 | .stop = c_stop, | |
383 | .show = show_cpuinfo, | |
384 | }; | |
385 | #endif /* CONFIG_PROC_FS */ |