Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[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/a.out.h>
21 #include <linux/tty.h>
22 #include <linux/ioport.h>
23 #include <linux/delay.h>
24 #include <linux/init.h>
25 #include <linux/bootmem.h>
26 #include <linux/seq_file.h>
27 #include <asm/processor.h>
28 #include <linux/console.h>
29 #include <asm/uaccess.h>
30 #include <asm/system.h>
31 #include <asm/setup.h>
32 #include <asm/io.h>
33 #include <asm/smp.h>
34 #include <asm/proc/proc.h>
35 #include <asm/busctl-regs.h>
36 #include <asm/fpu.h>
37 #include <asm/sections.h>
38
39 struct mn10300_cpuinfo boot_cpu_data;
40
41 /* For PCI or other memory-mapped resources */
42 unsigned long pci_mem_start = 0x18000000;
43
44 char redboot_command_line[COMMAND_LINE_SIZE] =
45         "console=ttyS0,115200 root=/dev/mtdblock3 rw";
46
47 char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
48
49 static struct resource code_resource = {
50         .start  = 0x100000,
51         .end    = 0,
52         .name   = "Kernel code",
53 };
54
55 static struct resource data_resource = {
56         .start  = 0,
57         .end    = 0,
58         .name   = "Kernel data",
59 };
60
61 static unsigned long __initdata phys_memory_base;
62 static unsigned long __initdata phys_memory_end;
63 static unsigned long __initdata memory_end;
64 unsigned long memory_size;
65
66 struct thread_info *__current_ti = &init_thread_union.thread_info;
67 struct task_struct *__current = &init_task;
68
69 #define mn10300_known_cpus 3
70 static const char *const mn10300_cputypes[] = {
71         "am33v1",
72         "am33v2",
73         "am34v1",
74         "unknown"
75 };
76
77 /*
78  *
79  */
80 static void __init parse_mem_cmdline(char **cmdline_p)
81 {
82         char *from, *to, c;
83
84         /* save unparsed command line copy for /proc/cmdline */
85         strcpy(boot_command_line, redboot_command_line);
86
87         /* see if there's an explicit memory size option */
88         from = redboot_command_line;
89         to = redboot_command_line;
90         c = ' ';
91
92         for (;;) {
93                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
94                         if (to != redboot_command_line)
95                                 to--;
96                         memory_size = memparse(from + 4, &from);
97                 }
98
99                 c = *(from++);
100                 if (!c)
101                         break;
102
103                 *(to++) = c;
104         }
105
106         *to = '\0';
107         *cmdline_p = redboot_command_line;
108
109         if (memory_size == 0)
110                 panic("Memory size not known\n");
111
112         memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
113                 memory_size;
114         if (memory_end > phys_memory_end)
115                 memory_end = phys_memory_end;
116 }
117
118 /*
119  * architecture specific setup
120  */
121 void __init setup_arch(char **cmdline_p)
122 {
123         unsigned long bootmap_size;
124         unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
125
126         cpu_init();
127         unit_setup();
128         parse_mem_cmdline(cmdline_p);
129
130         init_mm.start_code = (unsigned long)&_text;
131         init_mm.end_code = (unsigned long) &_etext;
132         init_mm.end_data = (unsigned long) &_edata;
133         init_mm.brk = (unsigned long) &_end;
134
135         code_resource.start = virt_to_bus(&_text);
136         code_resource.end = virt_to_bus(&_etext)-1;
137         data_resource.start = virt_to_bus(&_etext);
138         data_resource.end = virt_to_bus(&_edata)-1;
139
140 #define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
141 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
142 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
143
144         start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
145         kstart_pfn = PFN_UP(__pa(&_text));
146         free_pfn = PFN_UP(__pa(&_end));
147         end_pfn = PFN_DOWN(__pa(memory_end));
148
149         bootmap_size = init_bootmem_node(&contig_page_data,
150                                          free_pfn,
151                                          start_pfn,
152                                          end_pfn);
153
154         if (kstart_pfn > start_pfn)
155                 free_bootmem(PFN_PHYS(start_pfn),
156                              PFN_PHYS(kstart_pfn - start_pfn));
157
158         free_bootmem(PFN_PHYS(free_pfn),
159                      PFN_PHYS(end_pfn - free_pfn));
160
161         /* If interrupt vector table is in main ram, then we need to
162            reserve the page it is occupying. */
163         if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
164             CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
165                 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, 1,
166                                 BOOTMEM_DEFAULT);
167
168         reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
169                         BOOTMEM_DEFAULT);
170
171 #ifdef CONFIG_VT
172 #if defined(CONFIG_VGA_CONSOLE)
173         conswitchp = &vga_con;
174 #elif defined(CONFIG_DUMMY_CONSOLE)
175         conswitchp = &dummy_con;
176 #endif
177 #endif
178
179         paging_init();
180 }
181
182 /*
183  * perform CPU initialisation
184  */
185 void __init cpu_init(void)
186 {
187         unsigned long cpurev = CPUREV, type;
188         unsigned long base, size;
189
190         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
191         if (type > mn10300_known_cpus)
192                 type = mn10300_known_cpus;
193
194         printk(KERN_INFO "Matsushita %s, rev %ld\n",
195                mn10300_cputypes[type],
196                (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
197
198         /* determine the memory size and base from the memory controller regs */
199         memory_size = 0;
200
201         base = SDBASE(0);
202         if (base & SDBASE_CE) {
203                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
204                 size = ~size + 1;
205                 base &= SDBASE_CBA;
206
207                 printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
208                 memory_size += size;
209                 phys_memory_base = base;
210         }
211
212         base = SDBASE(1);
213         if (base & SDBASE_CE) {
214                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
215                 size = ~size + 1;
216                 base &= SDBASE_CBA;
217
218                 printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
219                 memory_size += size;
220                 if (phys_memory_base == 0)
221                         phys_memory_base = base;
222         }
223
224         phys_memory_end = phys_memory_base + memory_size;
225
226 #ifdef CONFIG_FPU
227         fpu_init_state();
228 #endif
229 }
230
231 /*
232  * Get CPU information for use by the procfs.
233  */
234 static int show_cpuinfo(struct seq_file *m, void *v)
235 {
236         unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
237
238         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
239         if (type > mn10300_known_cpus)
240                 type = mn10300_known_cpus;
241
242         icachesz =
243                 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
244                 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
245                 1024;
246
247         dcachesz =
248                 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
249                 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
250                 1024;
251
252         seq_printf(m,
253                    "processor  : 0\n"
254                    "vendor_id  : Matsushita\n"
255                    "cpu core   : %s\n"
256                    "cpu rev    : %lu\n"
257                    "model name : " PROCESSOR_MODEL_NAME         "\n"
258                    "icache size: %lu\n"
259                    "dcache size: %lu\n",
260                    mn10300_cputypes[type],
261                    (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
262                    icachesz,
263                    dcachesz
264                    );
265
266         seq_printf(m,
267                    "ioclk speed: %lu.%02luMHz\n"
268                    "bogomips   : %lu.%02lu\n\n",
269                    MN10300_IOCLK / 1000000,
270                    (MN10300_IOCLK / 10000) % 100,
271                    loops_per_jiffy / (500000 / HZ),
272                    (loops_per_jiffy / (5000 / HZ)) % 100
273                    );
274
275         return 0;
276 }
277
278 static void *c_start(struct seq_file *m, loff_t *pos)
279 {
280         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
281 }
282
283 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
284 {
285         ++*pos;
286         return c_start(m, pos);
287 }
288
289 static void c_stop(struct seq_file *m, void *v)
290 {
291 }
292
293 struct seq_operations cpuinfo_op = {
294         .start  = c_start,
295         .next   = c_next,
296         .stop   = c_stop,
297         .show   = show_cpuinfo,
298 };