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Linux/arch/mn10300/kernel/setup.c

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  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 static char __initdata cmd_line[COMMAND_LINE_SIZE];
 42 char redboot_command_line[COMMAND_LINE_SIZE] =
 43         "console=ttyS0,115200 root=/dev/mtdblock3 rw";
 44 
 45 char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
 46 
 47 static struct resource code_resource = {
 48         .start  = 0x100000,
 49         .end    = 0,
 50         .name   = "Kernel code",
 51 };
 52 
 53 static struct resource data_resource = {
 54         .start  = 0,
 55         .end    = 0,
 56         .name   = "Kernel data",
 57 };
 58 
 59 static unsigned long __initdata phys_memory_base;
 60 static unsigned long __initdata phys_memory_end;
 61 static unsigned long __initdata memory_end;
 62 unsigned long memory_size;
 63 
 64 struct thread_info *__current_ti = &init_thread_union.thread_info;
 65 struct task_struct *__current = &init_task;
 66 
 67 #define mn10300_known_cpus 5
 68 static const char *const mn10300_cputypes[] = {
 69         "am33-1",
 70         "am33-2",
 71         "am34-1",
 72         "am33-3",
 73         "am34-2",
 74         "unknown"
 75 };
 76 
 77 /*
 78  * Pick out the memory size.  We look for mem=size,
 79  * where size is "size[KkMm]"
 80  */
 81 static int __init early_mem(char *p)
 82 {
 83         memory_size = memparse(p, &p);
 84 
 85         if (memory_size == 0)
 86                 panic("Memory size not known\n");
 87 
 88         return 0;
 89 }
 90 early_param("mem", early_mem);
 91 
 92 /*
 93  * architecture specific setup
 94  */
 95 void __init setup_arch(char **cmdline_p)
 96 {
 97         unsigned long bootmap_size;
 98         unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
 99 
100         cpu_init();
101         unit_setup();
102         smp_init_cpus();
103 
104         /* save unparsed command line copy for /proc/cmdline */
105         strlcpy(boot_command_line, redboot_command_line, COMMAND_LINE_SIZE);
106 
107         /* populate cmd_line too for later use, preserving boot_command_line */
108         strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
109         *cmdline_p = cmd_line;
110 
111         parse_early_param();
112 
113         memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
114                 memory_size;
115         if (memory_end > phys_memory_end)
116                 memory_end = phys_memory_end;
117 
118         init_mm.start_code = (unsigned long)&_text;
119         init_mm.end_code = (unsigned long) &_etext;
120         init_mm.end_data = (unsigned long) &_edata;
121         init_mm.brk = (unsigned long) &_end;
122 
123         code_resource.start = virt_to_bus(&_text);
124         code_resource.end = virt_to_bus(&_etext)-1;
125         data_resource.start = virt_to_bus(&_etext);
126         data_resource.end = virt_to_bus(&_edata)-1;
127 
128         start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
129         kstart_pfn = PFN_UP(__pa(&_text));
130         free_pfn = PFN_UP(__pa(&_end));
131         end_pfn = PFN_DOWN(__pa(memory_end));
132 
133         bootmap_size = init_bootmem_node(&contig_page_data,
134                                          free_pfn,
135                                          start_pfn,
136                                          end_pfn);
137 
138         if (kstart_pfn > start_pfn)
139                 free_bootmem(PFN_PHYS(start_pfn),
140                              PFN_PHYS(kstart_pfn - start_pfn));
141 
142         free_bootmem(PFN_PHYS(free_pfn),
143                      PFN_PHYS(end_pfn - free_pfn));
144 
145         /* If interrupt vector table is in main ram, then we need to
146            reserve the page it is occupying. */
147         if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
148             CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
149                 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
150                                 BOOTMEM_DEFAULT);
151 
152         reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
153                         BOOTMEM_DEFAULT);
154 
155 #ifdef CONFIG_VT
156 #if defined(CONFIG_VGA_CONSOLE)
157         conswitchp = &vga_con;
158 #elif defined(CONFIG_DUMMY_CONSOLE)
159         conswitchp = &dummy_con;
160 #endif
161 #endif
162 
163         paging_init();
164 }
165 
166 /*
167  * perform CPU initialisation
168  */
169 void __init cpu_init(void)
170 {
171         unsigned long cpurev = CPUREV, type;
172 
173         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
174         if (type > mn10300_known_cpus)
175                 type = mn10300_known_cpus;
176 
177         printk(KERN_INFO "Panasonic %s, rev %ld\n",
178                mn10300_cputypes[type],
179                (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
180 
181         get_mem_info(&phys_memory_base, &memory_size);
182         phys_memory_end = phys_memory_base + memory_size;
183 
184         fpu_init_state();
185 }
186 
187 static struct cpu cpu_devices[NR_CPUS];
188 
189 static int __init topology_init(void)
190 {
191         int i;
192 
193         for_each_present_cpu(i)
194                 register_cpu(&cpu_devices[i], i);
195 
196         return 0;
197 }
198 
199 subsys_initcall(topology_init);
200 
201 /*
202  * Get CPU information for use by the procfs.
203  */
204 static int show_cpuinfo(struct seq_file *m, void *v)
205 {
206 #ifdef CONFIG_SMP
207         struct mn10300_cpuinfo *c = v;
208         unsigned long cpu_id = c - cpu_data;
209         unsigned long cpurev = c->type, type, icachesz, dcachesz;
210 #else  /* CONFIG_SMP */
211         unsigned long cpu_id = 0;
212         unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
213 #endif /* CONFIG_SMP */
214 
215 #ifdef CONFIG_SMP
216         if (!cpu_online(cpu_id))
217                 return 0;
218 #endif
219 
220         type = (cpurev & CPUREV_TYPE) >> CPUREV_TYPE_S;
221         if (type > mn10300_known_cpus)
222                 type = mn10300_known_cpus;
223 
224         icachesz =
225                 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
226                 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
227                 1024;
228 
229         dcachesz =
230                 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
231                 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
232                 1024;
233 
234         seq_printf(m,
235                    "processor  : %ld\n"
236                    "vendor_id  : " PROCESSOR_VENDOR_NAME "\n"
237                    "cpu core   : %s\n"
238                    "cpu rev    : %lu\n"
239                    "model name : " PROCESSOR_MODEL_NAME         "\n"
240                    "icache size: %lu\n"
241                    "dcache size: %lu\n",
242                    cpu_id,
243                    mn10300_cputypes[type],
244                    (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
245                    icachesz,
246                    dcachesz
247                    );
248 
249         seq_printf(m,
250                    "ioclk speed: %lu.%02luMHz\n"
251                    "bogomips   : %lu.%02lu\n\n",
252                    MN10300_IOCLK / 1000000,
253                    (MN10300_IOCLK / 10000) % 100,
254 #ifdef CONFIG_SMP
255                    c->loops_per_jiffy / (500000 / HZ),
256                    (c->loops_per_jiffy / (5000 / HZ)) % 100
257 #else  /* CONFIG_SMP */
258                    loops_per_jiffy / (500000 / HZ),
259                    (loops_per_jiffy / (5000 / HZ)) % 100
260 #endif /* CONFIG_SMP */
261                    );
262 
263         return 0;
264 }
265 
266 static void *c_start(struct seq_file *m, loff_t *pos)
267 {
268         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
269 }
270 
271 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
272 {
273         ++*pos;
274         return c_start(m, pos);
275 }
276 
277 static void c_stop(struct seq_file *m, void *v)
278 {
279 }
280 
281 const struct seq_operations cpuinfo_op = {
282         .start  = c_start,
283         .next   = c_next,
284         .stop   = c_stop,
285         .show   = show_cpuinfo,
286 };
287 

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