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/user.h>
19 #include <linux/tty.h>
20 #include <linux/ioport.h>
21 #include <linux/delay.h>
22 #include <linux/init.h>
23 #include <linux/bootmem.h>
24 #include <linux/seq_file.h>
25 #include <linux/cpu.h>
26 #include <asm/processor.h>
27 #include <linux/console.h>
28 #include <asm/uaccess.h>
29 #include <asm/setup.h>
30 #include <asm/io.h>
31 #include <asm/smp.h>
32 #include <proc/proc.h>
33 #include <asm/fpu.h>
34 #include <asm/sections.h>
35
36 struct mn10300_cpuinfo boot_cpu_data;
37
38 static char __initdata cmd_line[COMMAND_LINE_SIZE];
39 char redboot_command_line[COMMAND_LINE_SIZE] =
40 "console=ttyS0,115200 root=/dev/mtdblock3 rw";
41
42 char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
43
44 static struct resource code_resource = {
45 .start = 0x100000,
46 .end = 0,
47 .name = "Kernel code",
48 };
49
50 static struct resource data_resource = {
51 .start = 0,
52 .end = 0,
53 .name = "Kernel data",
54 };
55
56 static unsigned long __initdata phys_memory_base;
57 static unsigned long __initdata phys_memory_end;
58 static unsigned long __initdata memory_end;
59 unsigned long memory_size;
60
61 struct thread_info *__current_ti = &init_thread_union.thread_info;
62 struct task_struct *__current = &init_task;
63
64 #define mn10300_known_cpus 5
65 static const char *const mn10300_cputypes[] = {
66 "am33-1",
67 "am33-2",
68 "am34-1",
69 "am33-3",
70 "am34-2",
71 "unknown"
72 };
73
74 /*
75 * Pick out the memory size. We look for mem=size,
76 * where size is "size[KkMm]"
77 */
78 static int __init early_mem(char *p)
79 {
80 memory_size = memparse(p, &p);
81
82 if (memory_size == 0)
83 panic("Memory size not known\n");
84
85 return 0;
86 }
87 early_param("mem", early_mem);
88
89 /*
90 * architecture specific setup
91 */
92 void __init setup_arch(char **cmdline_p)
93 {
94 unsigned long bootmap_size;
95 unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
96
97 cpu_init();
98 unit_setup();
99 smp_init_cpus();
100
101 /* save unparsed command line copy for /proc/cmdline */
102 strlcpy(boot_command_line, redboot_command_line, COMMAND_LINE_SIZE);
103
104 /* populate cmd_line too for later use, preserving boot_command_line */
105 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
106 *cmdline_p = cmd_line;
107
108 parse_early_param();
109
110 memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
111 memory_size;
112 if (memory_end > phys_memory_end)
113 memory_end = phys_memory_end;
114
115 init_mm.start_code = (unsigned long)&_text;
116 init_mm.end_code = (unsigned long) &_etext;
117 init_mm.end_data = (unsigned long) &_edata;
118 init_mm.brk = (unsigned long) &_end;
119
120 code_resource.start = virt_to_bus(&_text);
121 code_resource.end = virt_to_bus(&_etext)-1;
122 data_resource.start = virt_to_bus(&_etext);
123 data_resource.end = virt_to_bus(&_edata)-1;
124
125 start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
126 kstart_pfn = PFN_UP(__pa(&_text));
127 free_pfn = PFN_UP(__pa(&_end));
128 end_pfn = PFN_DOWN(__pa(memory_end));
129
130 bootmap_size = init_bootmem_node(&contig_page_data,
131 free_pfn,
132 start_pfn,
133 end_pfn);
134
135 if (kstart_pfn > start_pfn)
136 free_bootmem(PFN_PHYS(start_pfn),
137 PFN_PHYS(kstart_pfn - start_pfn));
138
139 free_bootmem(PFN_PHYS(free_pfn),
140 PFN_PHYS(end_pfn - free_pfn));
141
142 /* If interrupt vector table is in main ram, then we need to
143 reserve the page it is occupying. */
144 if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
145 CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
146 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
147 BOOTMEM_DEFAULT);
148
149 reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
150 BOOTMEM_DEFAULT);
151
152 #ifdef CONFIG_VT
153 #if defined(CONFIG_VGA_CONSOLE)
154 conswitchp = &vga_con;
155 #elif defined(CONFIG_DUMMY_CONSOLE)
156 conswitchp = &dummy_con;
157 #endif
158 #endif
159
160 paging_init();
161 }
162
163 /*
164 * perform CPU initialisation
165 */
166 void __init cpu_init(void)
167 {
168 unsigned long cpurev = CPUREV, type;
169
170 type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
171 if (type > mn10300_known_cpus)
172 type = mn10300_known_cpus;
173
174 printk(KERN_INFO "Panasonic %s, rev %ld\n",
175 mn10300_cputypes[type],
176 (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
177
178 get_mem_info(&phys_memory_base, &memory_size);
179 phys_memory_end = phys_memory_base + memory_size;
180
181 fpu_init_state();
182 }
183
184 static struct cpu cpu_devices[NR_CPUS];
185
186 static int __init topology_init(void)
187 {
188 int i;
189
190 for_each_present_cpu(i)
191 register_cpu(&cpu_devices[i], i);
192
193 return 0;
194 }
195
196 subsys_initcall(topology_init);
197
198 /*
199 * Get CPU information for use by the procfs.
200 */
201 static int show_cpuinfo(struct seq_file *m, void *v)
202 {
203 #ifdef CONFIG_SMP
204 struct mn10300_cpuinfo *c = v;
205 unsigned long cpu_id = c - cpu_data;
206 unsigned long cpurev = c->type, type, icachesz, dcachesz;
207 #else /* CONFIG_SMP */
208 unsigned long cpu_id = 0;
209 unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
210 #endif /* CONFIG_SMP */
211
212 #ifdef CONFIG_SMP
213 if (!cpu_online(cpu_id))
214 return 0;
215 #endif
216
217 type = (cpurev & CPUREV_TYPE) >> CPUREV_TYPE_S;
218 if (type > mn10300_known_cpus)
219 type = mn10300_known_cpus;
220
221 icachesz =
222 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S) *
223 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
224 1024;
225
226 dcachesz =
227 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S) *
228 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
229 1024;
230
231 seq_printf(m,
232 "processor : %ld\n"
233 "vendor_id : " PROCESSOR_VENDOR_NAME "\n"
234 "cpu core : %s\n"
235 "cpu rev : %lu\n"
236 "model name : " PROCESSOR_MODEL_NAME "\n"
237 "icache size: %lu\n"
238 "dcache size: %lu\n",
239 cpu_id,
240 mn10300_cputypes[type],
241 (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
242 icachesz,
243 dcachesz
244 );
245
246 seq_printf(m,
247 "ioclk speed: %lu.%02luMHz\n"
248 "bogomips : %lu.%02lu\n\n",
249 MN10300_IOCLK / 1000000,
250 (MN10300_IOCLK / 10000) % 100,
251 #ifdef CONFIG_SMP
252 c->loops_per_jiffy / (500000 / HZ),
253 (c->loops_per_jiffy / (5000 / HZ)) % 100
254 #else /* CONFIG_SMP */
255 loops_per_jiffy / (500000 / HZ),
256 (loops_per_jiffy / (5000 / HZ)) % 100
257 #endif /* CONFIG_SMP */
258 );
259
260 return 0;
261 }
262
263 static void *c_start(struct seq_file *m, loff_t *pos)
264 {
265 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
266 }
267
268 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
269 {
270 ++*pos;
271 return c_start(m, pos);
272 }
273
274 static void c_stop(struct seq_file *m, void *v)
275 {
276 }
277
278 const struct seq_operations cpuinfo_op = {
279 .start = c_start,
280 .next = c_next,
281 .stop = c_stop,
282 .show = show_cpuinfo,
283 };
284
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