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
  36struct mn10300_cpuinfo boot_cpu_data;
  37
  38static char __initdata cmd_line[COMMAND_LINE_SIZE];
  39char redboot_command_line[COMMAND_LINE_SIZE] =
  40        "console=ttyS0,115200 root=/dev/mtdblock3 rw";
  41
  42char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
  43
  44static struct resource code_resource = {
  45        .start  = 0x100000,
  46        .end    = 0,
  47        .name   = "Kernel code",
  48};
  49
  50static struct resource data_resource = {
  51        .start  = 0,
  52        .end    = 0,
  53        .name   = "Kernel data",
  54};
  55
  56static unsigned long __initdata phys_memory_base;
  57static unsigned long __initdata phys_memory_end;
  58static unsigned long __initdata memory_end;
  59unsigned long memory_size;
  60
  61struct thread_info *__current_ti = &init_thread_union.thread_info;
  62struct task_struct *__current = &init_task;
  63
  64#define mn10300_known_cpus 5
  65static 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 */
  78static 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}
  87early_param("mem", early_mem);
  88
  89/*
  90 * architecture specific setup
  91 */
  92void __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 */
 166void __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
 184static struct cpu cpu_devices[NR_CPUS];
 185
 186static 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
 196subsys_initcall(topology_init);
 197
 198/*
 199 * Get CPU information for use by the procfs.
 200 */
 201static 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
 263static void *c_start(struct seq_file *m, loff_t *pos)
 264{
 265        return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 266}
 267
 268static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 269{
 270        ++*pos;
 271        return c_start(m, pos);
 272}
 273
 274static void c_stop(struct seq_file *m, void *v)
 275{
 276}
 277
 278const struct seq_operations cpuinfo_op = {
 279        .start  = c_start,
 280        .next   = c_next,
 281        .stop   = c_stop,
 282        .show   = show_cpuinfo,
 283};
 284