/*
 * arch/sh/kernel/setup.c
 *
 * This file handles the architecture-dependent parts of initialization
 *
 *  Copyright (C) 1999  Niibe Yutaka
 *  Copyright (C) 2002 - 2007 Paul Mundt
 */
#include <linux/screen_info.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/bootmem.h>
#include <linux/console.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/utsname.h>
#include <linux/nodemask.h>
#include <linux/cpu.h>
#include <linux/pfn.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/kexec.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/sections.h>
#include <asm/irq.h>
#include <asm/setup.h>
#include <asm/clock.h>
#include <asm/mmu_context.h>

/*
 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
 * This value will be used at the very early stage of serial setup.
 * The bigger value means no problem.
 */
struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
        [0] = {
                .type                   = CPU_SH_NONE,
                .loops_per_jiffy        = 10000000,
        },
};
EXPORT_SYMBOL(cpu_data);

/*
 * The machine vector. First entry in .machvec.init, or clobbered by
 * sh_mv= on the command line, prior to .machvec.init teardown.
 */
struct sh_machine_vector sh_mv = { .mv_name = "generic", };

#ifdef CONFIG_VT
struct screen_info screen_info;
#endif

extern int root_mountflags;

#define RAMDISK_IMAGE_START_MASK        0x07FF
#define RAMDISK_PROMPT_FLAG             0x8000
#define RAMDISK_LOAD_FLAG               0x4000

static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };

static struct resource code_resource = {
        .name = "Kernel code",
        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};

static struct resource data_resource = {
        .name = "Kernel data",
        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};

unsigned long memory_start;
EXPORT_SYMBOL(memory_start);
unsigned long memory_end = 0;
EXPORT_SYMBOL(memory_end);

static int __init early_parse_mem(char *p)
{
        unsigned long size;

        memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
        size = memparse(p, &p);
        memory_end = memory_start + size;

        return 0;
}
early_param("mem", early_parse_mem);

/*
 * Register fully available low RAM pages with the bootmem allocator.
 */
static void __init register_bootmem_low_pages(void)
{
        unsigned long curr_pfn, last_pfn, pages;

        /*
         * We are rounding up the start address of usable memory:
         */
        curr_pfn = PFN_UP(__MEMORY_START);

        /*
         * ... and at the end of the usable range downwards:
         */
        last_pfn = PFN_DOWN(__pa(memory_end));

        if (last_pfn > max_low_pfn)
                last_pfn = max_low_pfn;

        pages = last_pfn - curr_pfn;
        free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
}

#ifdef CONFIG_KEXEC
static void __init reserve_crashkernel(void)
{
        unsigned long long free_mem;
        unsigned long long crash_size, crash_base;
        int ret;

        free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;

        ret = parse_crashkernel(boot_command_line, free_mem,
                        &crash_size, &crash_base);
        if (ret == 0 && crash_size) {
                if (crash_base > 0) {
                        printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
                                        "for crashkernel (System RAM: %ldMB)\n",
                                        (unsigned long)(crash_size >> 20),
                                        (unsigned long)(crash_base >> 20),
                                        (unsigned long)(free_mem >> 20));
                        crashk_res.start = crash_base;
                        crashk_res.end   = crash_base + crash_size - 1;
                        reserve_bootmem(crash_base, crash_size);
                } else
                        printk(KERN_INFO "crashkernel reservation failed - "
                                        "you have to specify a base address\n");
        }
}
#else
static inline void __init reserve_crashkernel(void)
{}
#endif

void __init setup_bootmem_allocator(unsigned long free_pfn)
{
        unsigned long bootmap_size;

        /*
         * Find a proper area for the bootmem bitmap. After this
         * bootstrap step all allocations (until the page allocator
         * is intact) must be done via bootmem_alloc().
         */
        bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
                                         min_low_pfn, max_low_pfn);

        add_active_range(0, min_low_pfn, max_low_pfn);
        register_bootmem_low_pages();

        node_set_online(0);

        /*
         * Reserve the kernel text and
         * Reserve the bootmem bitmap. We do this in two steps (first step
         * was init_bootmem()), because this catches the (definitely buggy)
         * case of us accidentally initializing the bootmem allocator with
         * an invalid RAM area.
         */
        reserve_bootmem(__MEMORY_START+PAGE_SIZE,
                (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);

        /*
         * reserve physical page 0 - it's a special BIOS page on many boxes,
         * enabling clean reboots, SMP operation, laptop functions.
         */
        reserve_bootmem(__MEMORY_START, PAGE_SIZE);

        sparse_memory_present_with_active_regions(0);

#ifdef CONFIG_BLK_DEV_INITRD
        ROOT_DEV = Root_RAM0;

        if (LOADER_TYPE && INITRD_START) {
                if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
                        reserve_bootmem(INITRD_START + __MEMORY_START,
                                        INITRD_SIZE);
                        initrd_start = INITRD_START + PAGE_OFFSET +
                                        __MEMORY_START;
                        initrd_end = initrd_start + INITRD_SIZE;
                } else {
                        printk("initrd extends beyond end of memory "
                            "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
                                    INITRD_START + INITRD_SIZE,
                                    max_low_pfn << PAGE_SHIFT);
                        initrd_start = 0;
                }
        }
#endif

        reserve_crashkernel();
}

#ifndef CONFIG_NEED_MULTIPLE_NODES
static void __init setup_memory(void)
{
        unsigned long start_pfn;

        /*
         * Partially used pages are not usable - thus
         * we are rounding upwards:
         */
        start_pfn = PFN_UP(__pa(_end));
        setup_bootmem_allocator(start_pfn);
}
#else
extern void __init setup_memory(void);
#endif

void __init setup_arch(char **cmdline_p)
{
        enable_mmu();

        ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);

#ifdef CONFIG_BLK_DEV_RAM
        rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
        rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
        rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif

        if (!MOUNT_ROOT_RDONLY)
                root_mountflags &= ~MS_RDONLY;
        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_phys(_text);
        code_resource.end = virt_to_phys(_etext)-1;
        data_resource.start = virt_to_phys(_etext);
        data_resource.end = virt_to_phys(_edata)-1;

        memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
        if (!memory_end)
                memory_end = memory_start + __MEMORY_SIZE;

#ifdef CONFIG_CMDLINE_BOOL
        strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
#else
        strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
#endif

        /* Save unparsed command line copy for /proc/cmdline */
        memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
        *cmdline_p = command_line;

        parse_early_param();

        sh_mv_setup();

        /*
         * Find the highest page frame number we have available
         */
        max_pfn = PFN_DOWN(__pa(memory_end));

        /*
         * Determine low and high memory ranges:
         */
        max_low_pfn = max_pfn;
        min_low_pfn = __MEMORY_START >> PAGE_SHIFT;

        nodes_clear(node_online_map);

        /* Setup bootmem with available RAM */
        setup_memory();
        sparse_init();

#ifdef CONFIG_DUMMY_CONSOLE
        conswitchp = &dummy_con;
#endif

        /* Perform the machine specific initialisation */
        if (likely(sh_mv.mv_setup))
                sh_mv.mv_setup(cmdline_p);

        paging_init();

#ifdef CONFIG_SMP
        plat_smp_setup();
#endif
}

static const char *cpu_name[] = {
        [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
        [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
        [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
        [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
        [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
        [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
        [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
        [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
        [CPU_SH7760]    = "SH7760",
        [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
        [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
        [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
        [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
        [CPU_SHX3]      = "SH-X3",      [CPU_SH_NONE]   = "Unknown"
};

const char *get_cpu_subtype(struct sh_cpuinfo *c)
{
        return cpu_name[c->type];
}

#ifdef CONFIG_PROC_FS
/* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
static const char *cpu_flags[] = {
        "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
        "ptea", "llsc", "l2", "op32", NULL
};

static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
{
        unsigned long i;

        seq_printf(m, "cpu flags\t:");

        if (!c->flags) {
                seq_printf(m, " %s\n", cpu_flags[0]);
                return;
        }

        for (i = 0; cpu_flags[i]; i++)
                if ((c->flags & (1 << i)))
                        seq_printf(m, " %s", cpu_flags[i+1]);

        seq_printf(m, "\n");
}

static void show_cacheinfo(struct seq_file *m, const char *type,
                           struct cache_info info)
{
        unsigned int cache_size;

        cache_size = info.ways * info.sets * info.linesz;

        seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
                   type, cache_size >> 10, info.ways);
}

/*
 *      Get CPU information for use by the procfs.
 */
static int show_cpuinfo(struct seq_file *m, void *v)
{
        struct sh_cpuinfo *c = v;
        unsigned int cpu = c - cpu_data;

        if (!cpu_online(cpu))
                return 0;

        if (cpu == 0)
                seq_printf(m, "machine\t\t: %s\n", get_system_type());

        seq_printf(m, "processor\t: %d\n", cpu);
        seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
        seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));

        show_cpuflags(m, c);

        seq_printf(m, "cache type\t: ");

        /*
         * Check for what type of cache we have, we support both the
         * unified cache on the SH-2 and SH-3, as well as the harvard
         * style cache on the SH-4.
         */
        if (c->icache.flags & SH_CACHE_COMBINED) {
                seq_printf(m, "unified\n");
                show_cacheinfo(m, "cache", c->icache);
        } else {
                seq_printf(m, "split (harvard)\n");
                show_cacheinfo(m, "icache", c->icache);
                show_cacheinfo(m, "dcache", c->dcache);
        }

        /* Optional secondary cache */
        if (c->flags & CPU_HAS_L2_CACHE)
                show_cacheinfo(m, "scache", c->scache);

        seq_printf(m, "bogomips\t: %lu.%02lu\n",
                     c->loops_per_jiffy/(500000/HZ),
                     (c->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,
};
#endif /* CONFIG_PROC_FS */