Logo Search packages:      
Sourcecode: linux version File versions  Download package

setup.c

/* MN10300 Arch-specific initialisation
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <asm/processor.h>
#include <linux/console.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/setup.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/proc/proc.h>
#include <asm/busctl-regs.h>
#include <asm/fpu.h>
#include <asm/sections.h>

struct mn10300_cpuinfo boot_cpu_data;

/* For PCI or other memory-mapped resources */
unsigned long pci_mem_start = 0x18000000;

char redboot_command_line[COMMAND_LINE_SIZE] =
      "console=ttyS0,115200 root=/dev/mtdblock3 rw";

char __initdata redboot_platform_name[COMMAND_LINE_SIZE];

static struct resource code_resource = {
      .start      = 0x100000,
      .end  = 0,
      .name = "Kernel code",
};

static struct resource data_resource = {
      .start      = 0,
      .end  = 0,
      .name = "Kernel data",
};

static unsigned long __initdata phys_memory_base;
static unsigned long __initdata phys_memory_end;
static unsigned long __initdata memory_end;
unsigned long memory_size;

struct thread_info *__current_ti = &init_thread_union.thread_info;
struct task_struct *__current = &init_task;

#define mn10300_known_cpus 3
static const char *const mn10300_cputypes[] = {
      "am33v1",
      "am33v2",
      "am34v1",
      "unknown"
};

/*
 *
 */
static void __init parse_mem_cmdline(char **cmdline_p)
{
      char *from, *to, c;

      /* save unparsed command line copy for /proc/cmdline */
      strcpy(boot_command_line, redboot_command_line);

      /* see if there's an explicit memory size option */
      from = redboot_command_line;
      to = redboot_command_line;
      c = ' ';

      for (;;) {
            if (c == ' ' && !memcmp(from, "mem=", 4)) {
                  if (to != redboot_command_line)
                        to--;
                  memory_size = memparse(from + 4, &from);
            }

            c = *(from++);
            if (!c)
                  break;

            *(to++) = c;
      }

      *to = '\0';
      *cmdline_p = redboot_command_line;

      if (memory_size == 0)
            panic("Memory size not known\n");

      memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
            memory_size;
      if (memory_end > phys_memory_end)
            memory_end = phys_memory_end;
}

/*
 * architecture specific setup
 */
void __init setup_arch(char **cmdline_p)
{
      unsigned long bootmap_size;
      unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;

      cpu_init();
      unit_setup();
      parse_mem_cmdline(cmdline_p);

      init_mm.start_code = (unsigned long)&_text;
      init_mm.end_code = (unsigned long) &_etext;
      init_mm.end_data = (unsigned long) &_edata;
      init_mm.brk = (unsigned long) &_end;

      code_resource.start = virt_to_bus(&_text);
      code_resource.end = virt_to_bus(&_etext)-1;
      data_resource.start = virt_to_bus(&_etext);
      data_resource.end = virt_to_bus(&_edata)-1;

#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
#define PFN_PHYS(x)     ((x) << PAGE_SHIFT)

      start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
      kstart_pfn = PFN_UP(__pa(&_text));
      free_pfn = PFN_UP(__pa(&_end));
      end_pfn = PFN_DOWN(__pa(memory_end));

      bootmap_size = init_bootmem_node(&contig_page_data,
                               free_pfn,
                               start_pfn,
                               end_pfn);

      if (kstart_pfn > start_pfn)
            free_bootmem(PFN_PHYS(start_pfn),
                       PFN_PHYS(kstart_pfn - start_pfn));

      free_bootmem(PFN_PHYS(free_pfn),
                 PFN_PHYS(end_pfn - free_pfn));

      /* If interrupt vector table is in main ram, then we need to
         reserve the page it is occupying. */
      if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
          CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
            reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
                        BOOTMEM_DEFAULT);

      reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
                  BOOTMEM_DEFAULT);

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
      conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
      conswitchp = &dummy_con;
#endif
#endif

      paging_init();
}

/*
 * perform CPU initialisation
 */
void __init cpu_init(void)
{
      unsigned long cpurev = CPUREV, type;
      unsigned long base, size;

      type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
      if (type > mn10300_known_cpus)
            type = mn10300_known_cpus;

      printk(KERN_INFO "Matsushita %s, rev %ld\n",
             mn10300_cputypes[type],
             (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);

      /* determine the memory size and base from the memory controller regs */
      memory_size = 0;

      base = SDBASE(0);
      if (base & SDBASE_CE) {
            size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
            size = ~size + 1;
            base &= SDBASE_CBA;

            printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
            memory_size += size;
            phys_memory_base = base;
      }

      base = SDBASE(1);
      if (base & SDBASE_CE) {
            size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
            size = ~size + 1;
            base &= SDBASE_CBA;

            printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
            memory_size += size;
            if (phys_memory_base == 0)
                  phys_memory_base = base;
      }

      phys_memory_end = phys_memory_base + memory_size;

#ifdef CONFIG_FPU
      fpu_init_state();
#endif
}

/*
 * Get CPU information for use by the procfs.
 */
static int show_cpuinfo(struct seq_file *m, void *v)
{
      unsigned long cpurev = CPUREV, type, icachesz, dcachesz;

      type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
      if (type > mn10300_known_cpus)
            type = mn10300_known_cpus;

      icachesz =
            ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
            ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
            1024;

      dcachesz =
            ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
            ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
            1024;

      seq_printf(m,
               "processor  : 0\n"
               "vendor_id  : Matsushita\n"
               "cpu core   : %s\n"
               "cpu rev    : %lu\n"
               "model name : " PROCESSOR_MODEL_NAME         "\n"
               "icache size: %lu\n"
               "dcache size: %lu\n",
               mn10300_cputypes[type],
               (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
               icachesz,
               dcachesz
               );

      seq_printf(m,
               "ioclk speed: %lu.%02luMHz\n"
               "bogomips   : %lu.%02lu\n\n",
               MN10300_IOCLK / 1000000,
               (MN10300_IOCLK / 10000) % 100,
               loops_per_jiffy / (500000 / HZ),
               (loops_per_jiffy / (5000 / HZ)) % 100
               );

      return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
      return *pos < NR_CPUS ? cpu_data + *pos : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
      ++*pos;
      return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
      .start      = c_start,
      .next = c_next,
      .stop = c_stop,
      .show = show_cpuinfo,
};

Generated by  Doxygen 1.6.0   Back to index