Merge branch 'x86/nmi' into x86/devel
[linux-2.6] / arch / mn10300 / kernel / setup.c
1 /* MN10300 Arch-specific initialisation
2  *
3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public Licence
8  * as published by the Free Software Foundation; either version
9  * 2 of the Licence, or (at your option) any later version.
10  */
11 #include <linux/errno.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <linux/stddef.h>
16 #include <linux/unistd.h>
17 #include <linux/ptrace.h>
18 #include <linux/slab.h>
19 #include <linux/user.h>
20 #include <linux/tty.h>
21 #include <linux/ioport.h>
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/bootmem.h>
25 #include <linux/seq_file.h>
26 #include <asm/processor.h>
27 #include <linux/console.h>
28 #include <asm/uaccess.h>
29 #include <asm/system.h>
30 #include <asm/setup.h>
31 #include <asm/io.h>
32 #include <asm/smp.h>
33 #include <asm/proc/proc.h>
34 #include <asm/busctl-regs.h>
35 #include <asm/fpu.h>
36 #include <asm/sections.h>
37
38 struct mn10300_cpuinfo boot_cpu_data;
39
40 /* For PCI or other memory-mapped resources */
41 unsigned long pci_mem_start = 0x18000000;
42
43 char redboot_command_line[COMMAND_LINE_SIZE] =
44         "console=ttyS0,115200 root=/dev/mtdblock3 rw";
45
46 char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
47
48 static struct resource code_resource = {
49         .start  = 0x100000,
50         .end    = 0,
51         .name   = "Kernel code",
52 };
53
54 static struct resource data_resource = {
55         .start  = 0,
56         .end    = 0,
57         .name   = "Kernel data",
58 };
59
60 static unsigned long __initdata phys_memory_base;
61 static unsigned long __initdata phys_memory_end;
62 static unsigned long __initdata memory_end;
63 unsigned long memory_size;
64
65 struct thread_info *__current_ti = &init_thread_union.thread_info;
66 struct task_struct *__current = &init_task;
67
68 #define mn10300_known_cpus 3
69 static const char *const mn10300_cputypes[] = {
70         "am33v1",
71         "am33v2",
72         "am34v1",
73         "unknown"
74 };
75
76 /*
77  *
78  */
79 static void __init parse_mem_cmdline(char **cmdline_p)
80 {
81         char *from, *to, c;
82
83         /* save unparsed command line copy for /proc/cmdline */
84         strcpy(boot_command_line, redboot_command_line);
85
86         /* see if there's an explicit memory size option */
87         from = redboot_command_line;
88         to = redboot_command_line;
89         c = ' ';
90
91         for (;;) {
92                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
93                         if (to != redboot_command_line)
94                                 to--;
95                         memory_size = memparse(from + 4, &from);
96                 }
97
98                 c = *(from++);
99                 if (!c)
100                         break;
101
102                 *(to++) = c;
103         }
104
105         *to = '\0';
106         *cmdline_p = redboot_command_line;
107
108         if (memory_size == 0)
109                 panic("Memory size not known\n");
110
111         memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
112                 memory_size;
113         if (memory_end > phys_memory_end)
114                 memory_end = phys_memory_end;
115 }
116
117 /*
118  * architecture specific setup
119  */
120 void __init setup_arch(char **cmdline_p)
121 {
122         unsigned long bootmap_size;
123         unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
124
125         cpu_init();
126         unit_setup();
127         parse_mem_cmdline(cmdline_p);
128
129         init_mm.start_code = (unsigned long)&_text;
130         init_mm.end_code = (unsigned long) &_etext;
131         init_mm.end_data = (unsigned long) &_edata;
132         init_mm.brk = (unsigned long) &_end;
133
134         code_resource.start = virt_to_bus(&_text);
135         code_resource.end = virt_to_bus(&_etext)-1;
136         data_resource.start = virt_to_bus(&_etext);
137         data_resource.end = virt_to_bus(&_edata)-1;
138
139 #define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
140 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
141 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
142
143         start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
144         kstart_pfn = PFN_UP(__pa(&_text));
145         free_pfn = PFN_UP(__pa(&_end));
146         end_pfn = PFN_DOWN(__pa(memory_end));
147
148         bootmap_size = init_bootmem_node(&contig_page_data,
149                                          free_pfn,
150                                          start_pfn,
151                                          end_pfn);
152
153         if (kstart_pfn > start_pfn)
154                 free_bootmem(PFN_PHYS(start_pfn),
155                              PFN_PHYS(kstart_pfn - start_pfn));
156
157         free_bootmem(PFN_PHYS(free_pfn),
158                      PFN_PHYS(end_pfn - free_pfn));
159
160         /* If interrupt vector table is in main ram, then we need to
161            reserve the page it is occupying. */
162         if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
163             CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
164                 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, 1,
165                                 BOOTMEM_DEFAULT);
166
167         reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
168                         BOOTMEM_DEFAULT);
169
170 #ifdef CONFIG_VT
171 #if defined(CONFIG_VGA_CONSOLE)
172         conswitchp = &vga_con;
173 #elif defined(CONFIG_DUMMY_CONSOLE)
174         conswitchp = &dummy_con;
175 #endif
176 #endif
177
178         paging_init();
179 }
180
181 /*
182  * perform CPU initialisation
183  */
184 void __init cpu_init(void)
185 {
186         unsigned long cpurev = CPUREV, type;
187         unsigned long base, size;
188
189         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
190         if (type > mn10300_known_cpus)
191                 type = mn10300_known_cpus;
192
193         printk(KERN_INFO "Matsushita %s, rev %ld\n",
194                mn10300_cputypes[type],
195                (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
196
197         /* determine the memory size and base from the memory controller regs */
198         memory_size = 0;
199
200         base = SDBASE(0);
201         if (base & SDBASE_CE) {
202                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
203                 size = ~size + 1;
204                 base &= SDBASE_CBA;
205
206                 printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
207                 memory_size += size;
208                 phys_memory_base = base;
209         }
210
211         base = SDBASE(1);
212         if (base & SDBASE_CE) {
213                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
214                 size = ~size + 1;
215                 base &= SDBASE_CBA;
216
217                 printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
218                 memory_size += size;
219                 if (phys_memory_base == 0)
220                         phys_memory_base = base;
221         }
222
223         phys_memory_end = phys_memory_base + memory_size;
224
225 #ifdef CONFIG_FPU
226         fpu_init_state();
227 #endif
228 }
229
230 /*
231  * Get CPU information for use by the procfs.
232  */
233 static int show_cpuinfo(struct seq_file *m, void *v)
234 {
235         unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
236
237         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
238         if (type > mn10300_known_cpus)
239                 type = mn10300_known_cpus;
240
241         icachesz =
242                 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
243                 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
244                 1024;
245
246         dcachesz =
247                 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
248                 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
249                 1024;
250
251         seq_printf(m,
252                    "processor  : 0\n"
253                    "vendor_id  : Matsushita\n"
254                    "cpu core   : %s\n"
255                    "cpu rev    : %lu\n"
256                    "model name : " PROCESSOR_MODEL_NAME         "\n"
257                    "icache size: %lu\n"
258                    "dcache size: %lu\n",
259                    mn10300_cputypes[type],
260                    (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
261                    icachesz,
262                    dcachesz
263                    );
264
265         seq_printf(m,
266                    "ioclk speed: %lu.%02luMHz\n"
267                    "bogomips   : %lu.%02lu\n\n",
268                    MN10300_IOCLK / 1000000,
269                    (MN10300_IOCLK / 10000) % 100,
270                    loops_per_jiffy / (500000 / HZ),
271                    (loops_per_jiffy / (5000 / HZ)) % 100
272                    );
273
274         return 0;
275 }
276
277 static void *c_start(struct seq_file *m, loff_t *pos)
278 {
279         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
280 }
281
282 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
283 {
284         ++*pos;
285         return c_start(m, pos);
286 }
287
288 static void c_stop(struct seq_file *m, void *v)
289 {
290 }
291
292 struct seq_operations cpuinfo_op = {
293         .start  = c_start,
294         .next   = c_next,
295         .stop   = c_stop,
296         .show   = show_cpuinfo,
297 };