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-rw-r--r--arch/sh64/kernel/setup.c379
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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/screen_info.h>
40#include <linux/ioport.h>
41#include <linux/delay.h>
42#include <linux/init.h>
43#include <linux/seq_file.h>
44#include <linux/blkdev.h>
45#include <linux/bootmem.h>
46#include <linux/console.h>
47#include <linux/root_dev.h>
48#include <linux/cpu.h>
49#include <linux/initrd.h>
50#include <linux/pfn.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
62struct screen_info screen_info;
63
64#ifdef CONFIG_BLK_DEV_RAM
65extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
66extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
67extern int rd_image_start; /* starting block # of image */
68#endif
69
70extern int root_mountflags;
71extern char *get_system_type(void);
72extern void platform_setup(void);
73extern void platform_monitor(void);
74extern void platform_reserve(void);
75extern int sh64_cache_init(void);
76extern int sh64_tlb_init(void);
77
78#define RAMDISK_IMAGE_START_MASK 0x07FF
79#define RAMDISK_PROMPT_FLAG 0x8000
80#define RAMDISK_LOAD_FLAG 0x4000
81
82static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
83unsigned long long memory_start = CONFIG_MEMORY_START;
84unsigned long long memory_end = CONFIG_MEMORY_START + (CONFIG_MEMORY_SIZE_IN_MB * 1024 * 1024);
85
86struct sh_cpuinfo boot_cpu_data;
87
88static inline void parse_mem_cmdline (char ** cmdline_p)
89{
90 char c = ' ', *to = command_line, *from = COMMAND_LINE;
91 int len = 0;
92
93 /* Save unparsed command line copy for /proc/cmdline */
94 memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
95 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
96
97 for (;;) {
98 /*
99 * "mem=XXX[kKmM]" defines a size of memory.
100 */
101 if (c == ' ' && !memcmp(from, "mem=", 4)) {
102 if (to != command_line)
103 to--;
104 {
105 unsigned long mem_size;
106
107 mem_size = memparse(from+4, &from);
108 memory_end = memory_start + mem_size;
109 }
110 }
111 c = *(from++);
112 if (!c)
113 break;
114 if (COMMAND_LINE_SIZE <= ++len)
115 break;
116 *(to++) = c;
117 }
118 *to = '\0';
119
120 *cmdline_p = command_line;
121}
122
123static void __init sh64_cpu_type_detect(void)
124{
125 extern unsigned long long peek_real_address_q(unsigned long long addr);
126 unsigned long long cir;
127 /* Do peeks in real mode to avoid having to set up a mapping for the
128 WPC registers. On SH5-101 cut2, such a mapping would be exposed to
129 an address translation erratum which would make it hard to set up
130 correctly. */
131 cir = peek_real_address_q(0x0d000008);
132
133 if ((cir & 0xffff) == 0x5103) {
134 boot_cpu_data.type = CPU_SH5_103;
135 } else if (((cir >> 32) & 0xffff) == 0x51e2) {
136 /* CPU.VCR aliased at CIR address on SH5-101 */
137 boot_cpu_data.type = CPU_SH5_101;
138 } else {
139 boot_cpu_data.type = CPU_SH_NONE;
140 }
141}
142
143void __init setup_arch(char **cmdline_p)
144{
145 unsigned long bootmap_size, i;
146 unsigned long first_pfn, start_pfn, last_pfn, pages;
147
148#ifdef CONFIG_EARLY_PRINTK
149 extern void enable_early_printk(void);
150
151 /*
152 * Setup Early SCIF console
153 */
154 enable_early_printk();
155#endif
156
157 /*
158 * Setup TLB mappings
159 */
160 sh64_tlb_init();
161
162 /*
163 * Caches are already initialized by the time we get here, so we just
164 * fill in cpu_data info for the caches.
165 */
166 sh64_cache_init();
167
168 platform_setup();
169 platform_monitor();
170
171 sh64_cpu_type_detect();
172
173 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
174
175#ifdef CONFIG_BLK_DEV_RAM
176 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
177 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
178 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
179#endif
180
181 if (!MOUNT_ROOT_RDONLY)
182 root_mountflags &= ~MS_RDONLY;
183 init_mm.start_code = (unsigned long) _text;
184 init_mm.end_code = (unsigned long) _etext;
185 init_mm.end_data = (unsigned long) _edata;
186 init_mm.brk = (unsigned long) _end;
187
188 code_resource.start = __pa(_text);
189 code_resource.end = __pa(_etext)-1;
190 data_resource.start = __pa(_etext);
191 data_resource.end = __pa(_edata)-1;
192
193 parse_mem_cmdline(cmdline_p);
194
195 /*
196 * Find the lowest and highest page frame numbers we have available
197 */
198 first_pfn = PFN_DOWN(memory_start);
199 last_pfn = PFN_DOWN(memory_end);
200 pages = last_pfn - first_pfn;
201
202 /*
203 * Partially used pages are not usable - thus
204 * we are rounding upwards:
205 */
206 start_pfn = PFN_UP(__pa(_end));
207
208 /*
209 * Find a proper area for the bootmem bitmap. After this
210 * bootstrap step all allocations (until the page allocator
211 * is intact) must be done via bootmem_alloc().
212 */
213 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
214 first_pfn,
215 last_pfn);
216 /*
217 * Round it up.
218 */
219 bootmap_size = PFN_PHYS(PFN_UP(bootmap_size));
220
221 /*
222 * Register fully available RAM pages with the bootmem allocator.
223 */
224 free_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn), PFN_PHYS(pages));
225
226 /*
227 * Reserve all kernel sections + bootmem bitmap + a guard page.
228 */
229 reserve_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn),
230 (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE) - PFN_PHYS(first_pfn));
231
232 /*
233 * Reserve platform dependent sections
234 */
235 platform_reserve();
236
237#ifdef CONFIG_BLK_DEV_INITRD
238 if (LOADER_TYPE && INITRD_START) {
239 if (INITRD_START + INITRD_SIZE <= (PFN_PHYS(last_pfn))) {
240 reserve_bootmem_node(NODE_DATA(0), INITRD_START + __MEMORY_START, INITRD_SIZE);
241
242 initrd_start = (long) INITRD_START + PAGE_OFFSET + __MEMORY_START;
243 initrd_end = initrd_start + INITRD_SIZE;
244 } else {
245 printk("initrd extends beyond end of memory "
246 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
247 (long) INITRD_START + INITRD_SIZE,
248 PFN_PHYS(last_pfn));
249 initrd_start = 0;
250 }
251 }
252#endif
253
254 /*
255 * Claim all RAM, ROM, and I/O resources.
256 */
257
258 /* Kernel RAM */
259 request_resource(&iomem_resource, &code_resource);
260 request_resource(&iomem_resource, &data_resource);
261
262 /* Other KRAM space */
263 for (i = 0; i < STANDARD_KRAM_RESOURCES - 2; i++)
264 request_resource(&iomem_resource,
265 &platform_parms.kram_res_p[i]);
266
267 /* XRAM space */
268 for (i = 0; i < STANDARD_XRAM_RESOURCES; i++)
269 request_resource(&iomem_resource,
270 &platform_parms.xram_res_p[i]);
271
272 /* ROM space */
273 for (i = 0; i < STANDARD_ROM_RESOURCES; i++)
274 request_resource(&iomem_resource,
275 &platform_parms.rom_res_p[i]);
276
277 /* I/O space */
278 for (i = 0; i < STANDARD_IO_RESOURCES; i++)
279 request_resource(&ioport_resource,
280 &platform_parms.io_res_p[i]);
281
282
283#ifdef CONFIG_VT
284#if defined(CONFIG_VGA_CONSOLE)
285 conswitchp = &vga_con;
286#elif defined(CONFIG_DUMMY_CONSOLE)
287 conswitchp = &dummy_con;
288#endif
289#endif
290
291 printk("Hardware FPU: %s\n", fpu_in_use ? "enabled" : "disabled");
292
293 paging_init();
294}
295
296void __xchg_called_with_bad_pointer(void)
297{
298 printk(KERN_EMERG "xchg() called with bad pointer !\n");
299}
300
301static struct cpu cpu[1];
302
303static int __init topology_init(void)
304{
305 return register_cpu(cpu, 0);
306}
307
308subsys_initcall(topology_init);
309
310/*
311 * Get CPU information
312 */
313static const char *cpu_name[] = {
314 [CPU_SH5_101] = "SH5-101",
315 [CPU_SH5_103] = "SH5-103",
316 [CPU_SH_NONE] = "Unknown",
317};
318
319const char *get_cpu_subtype(void)
320{
321 return cpu_name[boot_cpu_data.type];
322}
323
324#ifdef CONFIG_PROC_FS
325static int show_cpuinfo(struct seq_file *m,void *v)
326{
327 unsigned int cpu = smp_processor_id();
328
329 if (!cpu)
330 seq_printf(m, "machine\t\t: %s\n", get_system_type());
331
332 seq_printf(m, "processor\t: %d\n", cpu);
333 seq_printf(m, "cpu family\t: SH-5\n");
334 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());
335
336 seq_printf(m, "icache size\t: %dK-bytes\n",
337 (boot_cpu_data.icache.ways *
338 boot_cpu_data.icache.sets *
339 boot_cpu_data.icache.linesz) >> 10);
340 seq_printf(m, "dcache size\t: %dK-bytes\n",
341 (boot_cpu_data.dcache.ways *
342 boot_cpu_data.dcache.sets *
343 boot_cpu_data.dcache.linesz) >> 10);
344 seq_printf(m, "itlb entries\t: %d\n", boot_cpu_data.itlb.entries);
345 seq_printf(m, "dtlb entries\t: %d\n", boot_cpu_data.dtlb.entries);
346
347#define PRINT_CLOCK(name, value) \
348 seq_printf(m, name " clock\t: %d.%02dMHz\n", \
349 ((value) / 1000000), ((value) % 1000000)/10000)
350
351 PRINT_CLOCK("cpu", boot_cpu_data.cpu_clock);
352 PRINT_CLOCK("bus", boot_cpu_data.bus_clock);
353 PRINT_CLOCK("module", boot_cpu_data.module_clock);
354
355 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
356 (loops_per_jiffy*HZ+2500)/500000,
357 ((loops_per_jiffy*HZ+2500)/5000) % 100);
358
359 return 0;
360}
361
362static void *c_start(struct seq_file *m, loff_t *pos)
363{
364 return (void*)(*pos == 0);
365}
366static void *c_next(struct seq_file *m, void *v, loff_t *pos)
367{
368 return NULL;
369}
370static void c_stop(struct seq_file *m, void *v)
371{
372}
373struct seq_operations cpuinfo_op = {
374 .start = c_start,
375 .next = c_next,
376 .stop = c_stop,
377 .show = show_cpuinfo,
378};
379#endif /* CONFIG_PROC_FS */
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