setup.c

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/* MN10300 Arch-specific initialisation
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * 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/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 <linux/cpu.h>
#include <asm/processor.h>
#include <linux/console.h>
#include <asm/uaccess.h>
#include <asm/setup.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <proc/proc.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 5
static const char *const mn10300_cputypes[] = {
    "am33-1",
    "am33-2",
    "am34-1",
    "am33-3",
    "am34-2",
    "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();
    smp_init_cpus();
    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;

    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;

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

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

    get_mem_info(&phys_memory_base, &memory_size);
    phys_memory_end = phys_memory_base + memory_size;

    fpu_init_state();
}

static struct cpu cpu_devices[NR_CPUS];

static int __init topology_init(void)
{
    int i;

    for_each_present_cpu(i)
        register_cpu(&cpu_devices[i], i);

    return 0;
}

subsys_initcall(topology_init);

/*
 * Get CPU information for use by the procfs.
 */
static int show_cpuinfo(struct seq_file *m, void *v)
{
#ifdef CONFIG_SMP
    struct mn10300_cpuinfo *c = v;
    unsigned long cpu_id = c - cpu_data;
    unsigned long cpurev = c->type, type, icachesz, dcachesz;
#else  /* CONFIG_SMP */
    unsigned long cpu_id = 0;
    unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
#endif /* CONFIG_SMP */

#ifdef CONFIG_SMP
    if (!cpu_online(cpu_id))
        return 0;
#endif

    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  : %ld\n"
           "vendor_id  : " PROCESSOR_VENDOR_NAME "\n"
           "cpu core   : %s\n"
           "cpu rev    : %lu\n"
           "model name : " PROCESSOR_MODEL_NAME     "\n"
           "icache size: %lu\n"
           "dcache size: %lu\n",
           cpu_id,
           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,
#ifdef CONFIG_SMP
           c->loops_per_jiffy / (500000 / HZ),
           (c->loops_per_jiffy / (5000 / HZ)) % 100
#else  /* CONFIG_SMP */
           loops_per_jiffy / (500000 / HZ),
           (loops_per_jiffy / (5000 / HZ)) % 100
#endif /* CONFIG_SMP */
           );

    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)
{
}

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