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-rw-r--r--arch/sh64/kernel/setup.c385
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diff --git a/arch/sh64/kernel/setup.c b/arch/sh64/kernel/setup.c
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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
66struct screen_info screen_info;
67
68#ifdef CONFIG_BLK_DEV_RAM
69extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
70extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
71extern int rd_image_start; /* starting block # of image */
72#endif
73
74extern int root_mountflags;
75extern char *get_system_type(void);
76extern void platform_setup(void);
77extern void platform_monitor(void);
78extern void platform_reserve(void);
79extern int sh64_cache_init(void);
80extern 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
86static char command_line[COMMAND_LINE_SIZE] = { 0, };
87unsigned long long memory_start = CONFIG_MEMORY_START;
88unsigned long long memory_end = CONFIG_MEMORY_START + (CONFIG_MEMORY_SIZE_IN_MB * 1024 * 1024);
89
90struct sh_cpuinfo boot_cpu_data;
91
92static 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
127static 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
147void __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
302void __xchg_called_with_bad_pointer(void)
303{
304 printk(KERN_EMERG "xchg() called with bad pointer !\n");
305}
306
307static struct cpu cpu[1];
308
309static int __init topology_init(void)
310{
311 return register_cpu(cpu, 0, NULL);
312}
313
314subsys_initcall(topology_init);
315
316/*
317 * Get CPU information
318 */
319static const char *cpu_name[] = {
320 [CPU_SH5_101] = "SH5-101",
321 [CPU_SH5_103] = "SH5-103",
322 [CPU_SH_NONE] = "Unknown",
323};
324
325const char *get_cpu_subtype(void)
326{
327 return cpu_name[boot_cpu_data.type];
328}
329
330#ifdef CONFIG_PROC_FS
331static 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
368static void *c_start(struct seq_file *m, loff_t *pos)
369{
370 return (void*)(*pos == 0);
371}
372static void *c_next(struct seq_file *m, void *v, loff_t *pos)
373{
374 return NULL;
375}
376static void c_stop(struct seq_file *m, void *v)
377{
378}
379struct 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 */
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