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/slab.h>
  19#include <linux/user.h>
  20#include <linux/tty.h>
  21#include <linux/ioport.h>
  22#include <linux/delay.h>
  23#include <linux/init.h>
  24#include <linux/bootmem.h>
  25#include <linux/seq_file.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 <asm/proc/proc.h>
  34#include <asm/busctl-regs.h>
  35#include <asm/fpu.h>
  36#include <asm/sections.h>
  37
  38struct mn10300_cpuinfo boot_cpu_data;
  39
  40/* For PCI or other memory-mapped resources */
  41unsigned long pci_mem_start = 0x18000000;
  42
  43char redboot_command_line[COMMAND_LINE_SIZE] =
  44        "console=ttyS0,115200 root=/dev/mtdblock3 rw";
  45
  46char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
  47
  48static struct resource code_resource = {
  49        .start  = 0x100000,
  50        .end    = 0,
  51        .name   = "Kernel code",
  52};
  53
  54static struct resource data_resource = {
  55        .start  = 0,
  56        .end    = 0,
  57        .name   = "Kernel data",
  58};
  59
  60static unsigned long __initdata phys_memory_base;
  61static unsigned long __initdata phys_memory_end;
  62static unsigned long __initdata memory_end;
  63unsigned long memory_size;
  64
  65struct thread_info *__current_ti = &init_thread_union.thread_info;
  66struct task_struct *__current = &init_task;
  67
  68#define mn10300_known_cpus 3
  69static const char *const mn10300_cputypes[] = {
  70        "am33v1",
  71        "am33v2",
  72        "am34v1",
  73        "unknown"
  74};
  75
  76/*
  77 *
  78 */
  79static 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 */
 120void __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        parse_mem_cmdline(cmdline_p);
 128
 129        init_mm.start_code = (unsigned long)&_text;
 130        init_mm.end_code = (unsigned long) &_etext;
 131        init_mm.end_data = (unsigned long) &_edata;
 132        init_mm.brk = (unsigned long) &_end;
 133
 134        code_resource.start = virt_to_bus(&_text);
 135        code_resource.end = virt_to_bus(&_etext)-1;
 136        data_resource.start = virt_to_bus(&_etext);
 137        data_resource.end = virt_to_bus(&_edata)-1;
 138
 139#define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
 140#define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
 141#define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 142
 143        start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
 144        kstart_pfn = PFN_UP(__pa(&_text));
 145        free_pfn = PFN_UP(__pa(&_end));
 146        end_pfn = PFN_DOWN(__pa(memory_end));
 147
 148        bootmap_size = init_bootmem_node(&contig_page_data,
 149                                         free_pfn,
 150                                         start_pfn,
 151                                         end_pfn);
 152
 153        if (kstart_pfn > start_pfn)
 154                free_bootmem(PFN_PHYS(start_pfn),
 155                             PFN_PHYS(kstart_pfn - start_pfn));
 156
 157        free_bootmem(PFN_PHYS(free_pfn),
 158                     PFN_PHYS(end_pfn - free_pfn));
 159
 160        /* If interrupt vector table is in main ram, then we need to
 161           reserve the page it is occupying. */
 162        if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
 163            CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
 164                reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, 1,
 165                                BOOTMEM_DEFAULT);
 166
 167        reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
 168                        BOOTMEM_DEFAULT);
 169
 170#ifdef CONFIG_VT
 171#if defined(CONFIG_VGA_CONSOLE)
 172        conswitchp = &vga_con;
 173#elif defined(CONFIG_DUMMY_CONSOLE)
 174        conswitchp = &dummy_con;
 175#endif
 176#endif
 177
 178        paging_init();
 179}
 180
 181/*
 182 * perform CPU initialisation
 183 */
 184void __init cpu_init(void)
 185{
 186        unsigned long cpurev = CPUREV, type;
 187        unsigned long base, size;
 188
 189        type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 190        if (type > mn10300_known_cpus)
 191                type = mn10300_known_cpus;
 192
 193        printk(KERN_INFO "Matsushita %s, rev %ld\n",
 194               mn10300_cputypes[type],
 195               (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
 196
 197        /* determine the memory size and base from the memory controller regs */
 198        memory_size = 0;
 199
 200        base = SDBASE(0);
 201        if (base & SDBASE_CE) {
 202                size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
 203                size = ~size + 1;
 204                base &= SDBASE_CBA;
 205
 206                printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
 207                memory_size += size;
 208                phys_memory_base = base;
 209        }
 210
 211        base = SDBASE(1);
 212        if (base & SDBASE_CE) {
 213                size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
 214                size = ~size + 1;
 215                base &= SDBASE_CBA;
 216
 217                printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
 218                memory_size += size;
 219                if (phys_memory_base == 0)
 220                        phys_memory_base = base;
 221        }
 222
 223        phys_memory_end = phys_memory_base + memory_size;
 224
 225#ifdef CONFIG_FPU
 226        fpu_init_state();
 227#endif
 228}
 229
 230/*
 231 * Get CPU information for use by the procfs.
 232 */
 233static int show_cpuinfo(struct seq_file *m, void *v)
 234{
 235        unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
 236
 237        type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 238        if (type > mn10300_known_cpus)
 239                type = mn10300_known_cpus;
 240
 241        icachesz =
 242                ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
 243                ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
 244                1024;
 245
 246        dcachesz =
 247                ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
 248                ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
 249                1024;
 250
 251        seq_printf(m,
 252                   "processor  : 0\n"
 253                   "vendor_id  : Matsushita\n"
 254                   "cpu core   : %s\n"
 255                   "cpu rev    : %lu\n"
 256                   "model name : " PROCESSOR_MODEL_NAME         "\n"
 257                   "icache size: %lu\n"
 258                   "dcache size: %lu\n",
 259                   mn10300_cputypes[type],
 260                   (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
 261                   icachesz,
 262                   dcachesz
 263                   );
 264
 265        seq_printf(m,
 266                   "ioclk speed: %lu.%02luMHz\n"
 267                   "bogomips   : %lu.%02lu\n\n",
 268                   MN10300_IOCLK / 1000000,
 269                   (MN10300_IOCLK / 10000) % 100,
 270                   loops_per_jiffy / (500000 / HZ),
 271                   (loops_per_jiffy / (5000 / HZ)) % 100
 272                   );
 273
 274        return 0;
 275}
 276
 277static void *c_start(struct seq_file *m, loff_t *pos)
 278{
 279        return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 280}
 281
 282static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 283{
 284        ++*pos;
 285        return c_start(m, pos);
 286}
 287
 288static void c_stop(struct seq_file *m, void *v)
 289{
 290}
 291
 292struct seq_operations cpuinfo_op = {
 293        .start  = c_start,
 294        .next   = c_next,
 295        .stop   = c_stop,
 296        .show   = show_cpuinfo,
 297};
 298