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/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/system.h>
  30 #include <asm/setup.h>
  31 #include <asm/io.h>
  32 #include <asm/smp.h>
  33 #include <proc/proc.h>
  34 #include <asm/fpu.h>
  35 #include <asm/sections.h>
  36
  37 struct mn10300_cpuinfo boot_cpu_data;
  38
  39 /* For PCI or other memory-mapped resources */
  40 unsigned long pci_mem_start = 0x18000000;
  41
  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  *
  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         smp_init_cpus();
 129         parse_mem_cmdline(cmdline_p);
 130
 131         init_mm.start_code = (unsigned long)&_text;
 132         init_mm.end_code = (unsigned long) &_etext;
 133         init_mm.end_data = (unsigned long) &_edata;
 134         init_mm.brk = (unsigned long) &_end;
 135
 136         code_resource.start = virt_to_bus(&_text);
 137         code_resource.end = virt_to_bus(&_etext)-1;
 138         data_resource.start = virt_to_bus(&_etext);
 139         data_resource.end = virt_to_bus(&_edata)-1;
 140
 141         start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
 142         kstart_pfn = PFN_UP(__pa(&_text));
 143         free_pfn = PFN_UP(__pa(&_end));
 144         end_pfn = PFN_DOWN(__pa(memory_end));
 145
 146         bootmap_size = init_bootmem_node(&contig_page_data,
 147                                          free_pfn,
 148                                          start_pfn,
 149                                          end_pfn);
 150
 151         if (kstart_pfn > start_pfn)
 152                 free_bootmem(PFN_PHYS(start_pfn),
 153                              PFN_PHYS(kstart_pfn - start_pfn));
 154
 155         free_bootmem(PFN_PHYS(free_pfn),
 156                      PFN_PHYS(end_pfn - free_pfn));
 157
 158         /* If interrupt vector table is in main ram, then we need to
 159            reserve the page it is occupying. */
 160         if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
 161             CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
 162                 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
 163                                 BOOTMEM_DEFAULT);
 164
 165         reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
 166                         BOOTMEM_DEFAULT);
 167
 168 #ifdef CONFIG_VT
 169 #if defined(CONFIG_VGA_CONSOLE)
 170         conswitchp = &vga_con;
 171 #elif defined(CONFIG_DUMMY_CONSOLE)
 172         conswitchp = &dummy_con;
 173 #endif
 174 #endif
 175
 176         paging_init();
 177 }
 178
 179 /*
 180  * perform CPU initialisation
 181  */
 182 void __init cpu_init(void)
 183 {
 184         unsigned long cpurev = CPUREV, type;
 185
 186         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 187         if (type > mn10300_known_cpus)
 188                 type = mn10300_known_cpus;
 189
 190         printk(KERN_INFO "Panasonic %s, rev %ld\n",
 191                mn10300_cputypes[type],
 192                (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
 193
 194         get_mem_info(&phys_memory_base, &memory_size);
 195         phys_memory_end = phys_memory_base + memory_size;
 196
 197         fpu_init_state();
 198 }
 199
 200 static struct cpu cpu_devices[NR_CPUS];
 201
 202 static int __init topology_init(void)
 203 {
 204         int i;
 205
 206         for_each_present_cpu(i)
 207                 register_cpu(&cpu_devices[i], i);
 208
 209         return 0;
 210 }
 211
 212 subsys_initcall(topology_init);
 213
 214 /*
 215  * Get CPU information for use by the procfs.
 216  */
 217 static int show_cpuinfo(struct seq_file *m, void *v)
 218 {
 219 #ifdef CONFIG_SMP
 220         struct mn10300_cpuinfo *c = v;
 221         unsigned long cpu_id = c - cpu_data;
 222         unsigned long cpurev = c->type, type, icachesz, dcachesz;
 223 #else  /* CONFIG_SMP */
 224         unsigned long cpu_id = 0;
 225         unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
 226 #endif /* CONFIG_SMP */
 227
 228 #ifdef CONFIG_SMP
 229         if (!cpu_online(cpu_id))
 230                 return 0;
 231 #endif
 232
 233         type = (cpurev & CPUREV_TYPE) >> CPUREV_TYPE_S;
 234         if (type > mn10300_known_cpus)
 235                 type = mn10300_known_cpus;
 236
 237         icachesz =
 238                 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
 239                 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
 240                 1024;
 241
 242         dcachesz =
 243                 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
 244                 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
 245                 1024;
 246
 247         seq_printf(m,
 248                    "processor  : %ld\n"
 249                    "vendor_id  : " PROCESSOR_VENDOR_NAME "\n"
 250                    "cpu core   : %s\n"
 251                    "cpu rev    : %lu\n"
 252                    "model name : " PROCESSOR_MODEL_NAME         "\n"
 253                    "icache size: %lu\n"
 254                    "dcache size: %lu\n",
 255                    cpu_id,
 256                    mn10300_cputypes[type],
 257                    (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
 258                    icachesz,
 259                    dcachesz
 260                    );
 261
 262         seq_printf(m,
 263                    "ioclk speed: %lu.%02luMHz\n"
 264                    "bogomips   : %lu.%02lu\n\n",
 265                    MN10300_IOCLK / 1000000,
 266                    (MN10300_IOCLK / 10000) % 100,
 267 #ifdef CONFIG_SMP
 268                    c->loops_per_jiffy / (500000 / HZ),
 269                    (c->loops_per_jiffy / (5000 / HZ)) % 100
 270 #else  /* CONFIG_SMP */
 271                    loops_per_jiffy / (500000 / HZ),
 272                    (loops_per_jiffy / (5000 / HZ)) % 100
 273 #endif /* CONFIG_SMP */
 274                    );
 275
 276         return 0;
 277 }
 278
 279 static void *c_start(struct seq_file *m, loff_t *pos)
 280 {
 281         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 282 }
 283
 284 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 285 {
 286         ++*pos;
 287         return c_start(m, pos);
 288 }
 289
 290 static void c_stop(struct seq_file *m, void *v)
 291 {
 292 }
 293
 294 const struct seq_operations cpuinfo_op = {
 295         .start  = c_start,
 296         .next   = c_next,
 297         .stop   = c_stop,
 298         .show   = show_cpuinfo,
 299 };