setup.c

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/*
 * Copyright (C) 2007-2009 Michal Simek <[email protected]>
 * Copyright (C) 2007-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/init.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/cpu.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/debugfs.h>

#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/page.h>
#include <linux/io.h>
#include <linux/bug.h>
#include <linux/param.h>
#include <linux/pci.h>
#include <linux/cache.h>
#include <linux/of_platform.h>
#include <linux/dma-mapping.h>
#include <asm/cacheflush.h>
#include <asm/entry.h>
#include <asm/cpuinfo.h>

#include <asm/prom.h>
#include <asm/pgtable.h>

DEFINE_PER_CPU(unsigned int, KSP);  /* Saved kernel stack pointer */
DEFINE_PER_CPU(unsigned int, KM);   /* Kernel/user mode */
DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */

unsigned int boot_cpuid;
/*
 * Placed cmd_line to .data section because can be initialized from
 * ASM code. Default position is BSS section which is cleared
 * in machine_early_init().
 */
char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));

void __init setup_arch(char **cmdline_p)
{
    *cmdline_p = cmd_line;

    console_verbose();

    unflatten_device_tree();

    setup_cpuinfo();

    microblaze_cache_init();

    setup_memory();

#ifdef CONFIG_EARLY_PRINTK
    /* remap early console to virtual address */
    remap_early_printk();
#endif

    xilinx_pci_init();

#if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
    pr_notice("Self modified code enable\n");
#endif

#ifdef CONFIG_VT
#if defined(CONFIG_XILINX_CONSOLE)
    conswitchp = &xil_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
    conswitchp = &dummy_con;
#endif
#endif
}

#ifdef CONFIG_MTD_UCLINUX
/* Handle both romfs and cramfs types, without generating unnecessary
 code (ie no point checking for CRAMFS if it's not even enabled) */
inline unsigned get_romfs_len(unsigned *addr)
{
#ifdef CONFIG_ROMFS_FS
    if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
        return be32_to_cpu(addr[2]);
#endif

#ifdef CONFIG_CRAMFS
    if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
        return le32_to_cpu(addr[1]);
#endif
    return 0;
}
#endif  /* CONFIG_MTD_UCLINUX_EBSS */

unsigned long kernel_tlb;

void __init machine_early_init(const char *cmdline, unsigned int ram,
        unsigned int fdt, unsigned int msr, unsigned int tlb0,
        unsigned int tlb1)
{
    unsigned long *src, *dst;
    unsigned int offset = 0;

    /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
     * end of kernel. There are two position which we want to check.
     * The first is __init_end and the second __bss_start.
     */
#ifdef CONFIG_MTD_UCLINUX
    int romfs_size;
    unsigned int romfs_base;
    char *old_klimit = klimit;

    romfs_base = (ram ? ram : (unsigned int)&__init_end);
    romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
    if (!romfs_size) {
        romfs_base = (unsigned int)&__bss_start;
        romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
    }

    /* Move ROMFS out of BSS before clearing it */
    if (romfs_size > 0) {
        memmove(&__bss_stop, (int *)romfs_base, romfs_size);
        klimit += romfs_size;
    }
#endif

/* clearing bss section */
    memset(__bss_start, 0, __bss_stop-__bss_start);
    memset(_ssbss, 0, _esbss-_ssbss);

    lockdep_init();

/* initialize device tree for usage in early_printk */
    early_init_devtree((void *)_fdt_start);

#ifdef CONFIG_EARLY_PRINTK
    setup_early_printk(NULL);
#endif

    /* setup kernel_tlb after BSS cleaning
     * Maybe worth to move to asm code */
    kernel_tlb = tlb0 + tlb1;
    /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
                            tlb1, kernel_tlb); */

    printk("Ramdisk addr 0x%08x, ", ram);
    if (fdt)
        printk("FDT at 0x%08x\n", fdt);
    else
        printk("Compiled-in FDT at 0x%08x\n",
                    (unsigned int)_fdt_start);

#ifdef CONFIG_MTD_UCLINUX
    printk("Found romfs @ 0x%08x (0x%08x)\n",
            romfs_base, romfs_size);
    printk("#### klimit %p ####\n", old_klimit);
    BUG_ON(romfs_size < 0); /* What else can we do? */

    printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
            romfs_size, romfs_base, (unsigned)&__bss_stop);

    printk("New klimit: 0x%08x\n", (unsigned)klimit);
#endif

#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
    if (msr)
        printk("!!!Your kernel has setup MSR instruction but "
                "CPU don't have it %x\n", msr);
#else
    if (!msr)
        printk("!!!Your kernel not setup MSR instruction but "
                "CPU have it %x\n", msr);
#endif

    /* Do not copy reset vectors. offset = 0x2 means skip the first
     * two instructions. dst is pointer to MB vectors which are placed
     * in block ram. If you want to copy reset vector setup offset to 0x0 */
#if !CONFIG_MANUAL_RESET_VECTOR
    offset = 0x2;
#endif
    dst = (unsigned long *) (offset * sizeof(u32));
    for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
        *dst = *src;

    /* Initialize global data */
    per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
    per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
}

#ifdef CONFIG_DEBUG_FS
struct dentry *of_debugfs_root;

static int microblaze_debugfs_init(void)
{
    of_debugfs_root = debugfs_create_dir("microblaze", NULL);

    return of_debugfs_root == NULL;
}
arch_initcall(microblaze_debugfs_init);

# ifdef CONFIG_MMU
static int __init debugfs_tlb(void)
{
    struct dentry *d;

    if (!of_debugfs_root)
        return -ENODEV;

    d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
    if (!d)
        return -ENOMEM;
}
device_initcall(debugfs_tlb);
# endif
#endif

static int dflt_bus_notify(struct notifier_block *nb,
                unsigned long action, void *data)
{
    struct device *dev = data;

    /* We are only intereted in device addition */
    if (action != BUS_NOTIFY_ADD_DEVICE)
        return 0;

    set_dma_ops(dev, &dma_direct_ops);

    return NOTIFY_DONE;
}

static struct notifier_block dflt_plat_bus_notifier = {
    .notifier_call = dflt_bus_notify,
    .priority = INT_MAX,
};

static int __init setup_bus_notifier(void)
{
    bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);

    return 0;
}

arch_initcall(setup_bus_notifier);