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 /* For PCI or other memory-mapped resources */
39 unsigned long pci_mem_start = 0x18000000;
40
41 char redboot_command_line[COMMAND_LINE_SIZE] =
42 "console=ttyS0,115200 root=/dev/mtdblock3 rw";
43
44 char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
45
46 static struct resource code_resource = {
47 .start = 0x100000,
48 .end = 0,
49 .name = "Kernel code",
50 };
51
52 static struct resource data_resource = {
53 .start = 0,
54 .end = 0,
55 .name = "Kernel data",
56 };
57
58 static unsigned long __initdata phys_memory_base;
59 static unsigned long __initdata phys_memory_end;
60 static unsigned long __initdata memory_end;
61 unsigned long memory_size;
62
63 struct thread_info *__current_ti = &init_thread_union.thread_info;
64 struct task_struct *__current = &init_task;
65
66 #define mn10300_known_cpus 5
67 static const char *const mn10300_cputypes[] = {
68 "am33-1",
69 "am33-2",
70 "am34-1",
71 "am33-3",
72 "am34-2",
73 "unknown"
74 };
75
76 /*
77 *
78 */
parse_mem_cmdline(char ** cmdline_p)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 */
setup_arch(char ** cmdline_p)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 smp_init_cpus();
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 start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
141 kstart_pfn = PFN_UP(__pa(&_text));
142 free_pfn = PFN_UP(__pa(&_end));
143 end_pfn = PFN_DOWN(__pa(memory_end));
144
145 bootmap_size = init_bootmem_node(&contig_page_data,
146 free_pfn,
147 start_pfn,
148 end_pfn);
149
150 if (kstart_pfn > start_pfn)
151 free_bootmem(PFN_PHYS(start_pfn),
152 PFN_PHYS(kstart_pfn - start_pfn));
153
154 free_bootmem(PFN_PHYS(free_pfn),
155 PFN_PHYS(end_pfn - free_pfn));
156
157 /* If interrupt vector table is in main ram, then we need to
158 reserve the page it is occupying. */
159 if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
160 CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
161 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
162 BOOTMEM_DEFAULT);
163
164 reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
165 BOOTMEM_DEFAULT);
166
167 #ifdef CONFIG_VT
168 #if defined(CONFIG_VGA_CONSOLE)
169 conswitchp = &vga_con;
170 #elif defined(CONFIG_DUMMY_CONSOLE)
171 conswitchp = &dummy_con;
172 #endif
173 #endif
174
175 paging_init();
176 }
177
178 /*
179 * perform CPU initialisation
180 */
cpu_init(void)181 void __init cpu_init(void)
182 {
183 unsigned long cpurev = CPUREV, type;
184
185 type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
186 if (type > mn10300_known_cpus)
187 type = mn10300_known_cpus;
188
189 printk(KERN_INFO "Panasonic %s, rev %ld\n",
190 mn10300_cputypes[type],
191 (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
192
193 get_mem_info(&phys_memory_base, &memory_size);
194 phys_memory_end = phys_memory_base + memory_size;
195
196 fpu_init_state();
197 }
198
199 static struct cpu cpu_devices[NR_CPUS];
200
topology_init(void)201 static int __init topology_init(void)
202 {
203 int i;
204
205 for_each_present_cpu(i)
206 register_cpu(&cpu_devices[i], i);
207
208 return 0;
209 }
210
211 subsys_initcall(topology_init);
212
213 /*
214 * Get CPU information for use by the procfs.
215 */
show_cpuinfo(struct seq_file * m,void * v)216 static int show_cpuinfo(struct seq_file *m, void *v)
217 {
218 #ifdef CONFIG_SMP
219 struct mn10300_cpuinfo *c = v;
220 unsigned long cpu_id = c - cpu_data;
221 unsigned long cpurev = c->type, type, icachesz, dcachesz;
222 #else /* CONFIG_SMP */
223 unsigned long cpu_id = 0;
224 unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
225 #endif /* CONFIG_SMP */
226
227 #ifdef CONFIG_SMP
228 if (!cpu_online(cpu_id))
229 return 0;
230 #endif
231
232 type = (cpurev & CPUREV_TYPE) >> CPUREV_TYPE_S;
233 if (type > mn10300_known_cpus)
234 type = mn10300_known_cpus;
235
236 icachesz =
237 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S) *
238 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
239 1024;
240
241 dcachesz =
242 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S) *
243 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
244 1024;
245
246 seq_printf(m,
247 "processor : %ld\n"
248 "vendor_id : " PROCESSOR_VENDOR_NAME "\n"
249 "cpu core : %s\n"
250 "cpu rev : %lu\n"
251 "model name : " PROCESSOR_MODEL_NAME "\n"
252 "icache size: %lu\n"
253 "dcache size: %lu\n",
254 cpu_id,
255 mn10300_cputypes[type],
256 (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
257 icachesz,
258 dcachesz
259 );
260
261 seq_printf(m,
262 "ioclk speed: %lu.%02luMHz\n"
263 "bogomips : %lu.%02lu\n\n",
264 MN10300_IOCLK / 1000000,
265 (MN10300_IOCLK / 10000) % 100,
266 #ifdef CONFIG_SMP
267 c->loops_per_jiffy / (500000 / HZ),
268 (c->loops_per_jiffy / (5000 / HZ)) % 100
269 #else /* CONFIG_SMP */
270 loops_per_jiffy / (500000 / HZ),
271 (loops_per_jiffy / (5000 / HZ)) % 100
272 #endif /* CONFIG_SMP */
273 );
274
275 return 0;
276 }
277
c_start(struct seq_file * m,loff_t * pos)278 static void *c_start(struct seq_file *m, loff_t *pos)
279 {
280 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
281 }
282
c_next(struct seq_file * m,void * v,loff_t * pos)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
c_stop(struct seq_file * m,void * v)289 static void c_stop(struct seq_file *m, void *v)
290 {
291 }
292
293 const struct seq_operations cpuinfo_op = {
294 .start = c_start,
295 .next = c_next,
296 .stop = c_stop,
297 .show = show_cpuinfo,
298 };
299