kernel/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/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 };