cfe.c

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/*
 * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/bootmem.h>
#include <linux/pm.h>
#include <linux/smp.h>

#include <asm/bootinfo.h>
#include <asm/reboot.h>
#include <asm/sibyte/board.h>
#include <asm/smp-ops.h>

#include <asm/fw/cfe/cfe_api.h>
#include <asm/fw/cfe/cfe_error.h>

/* Max ram addressable in 32-bit segments */
#ifdef CONFIG_64BIT
#define MAX_RAM_SIZE (~0ULL)
#else
#ifdef CONFIG_HIGHMEM
#ifdef CONFIG_64BIT_PHYS_ADDR
#define MAX_RAM_SIZE (~0ULL)
#else
#define MAX_RAM_SIZE (0xffffffffULL)
#endif
#else
#define MAX_RAM_SIZE (0x1fffffffULL)
#endif
#endif

#define SIBYTE_MAX_MEM_REGIONS 8
phys_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
phys_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
unsigned int board_mem_region_count;

int cfe_cons_handle;

#ifdef CONFIG_BLK_DEV_INITRD
extern unsigned long initrd_start, initrd_end;
#endif

static void __noreturn cfe_linux_exit(void *arg)
{
    int warm = *(int *)arg;

    if (smp_processor_id()) {
        static int reboot_smp;

        /* Don't repeat the process from another CPU */
        if (!reboot_smp) {
            /* Get CPU 0 to do the cfe_exit */
            reboot_smp = 1;
            smp_call_function(cfe_linux_exit, arg, 0);
        }
    } else {
        printk("Passing control back to CFE...\n");
        cfe_exit(warm, 0);
        printk("cfe_exit returned??\n");
    }
    while (1);
}

static void __noreturn cfe_linux_restart(char *command)
{
    static const int zero;

    cfe_linux_exit((void *)&zero);
}

static void __noreturn cfe_linux_halt(void)
{
    static const int one = 1;

    cfe_linux_exit((void *)&one);
}

static __init void prom_meminit(void)
{
    u64 addr, size, type; /* regardless of 64BIT_PHYS_ADDR */
    int mem_flags = 0;
    unsigned int idx;
    int rd_flag;
#ifdef CONFIG_BLK_DEV_INITRD
    unsigned long initrd_pstart;
    unsigned long initrd_pend;

    initrd_pstart = CPHYSADDR(initrd_start);
    initrd_pend = CPHYSADDR(initrd_end);
    if (initrd_start &&
        ((initrd_pstart > MAX_RAM_SIZE)
         || (initrd_pend > MAX_RAM_SIZE))) {
        panic("initrd out of addressable memory");
    }

#endif /* INITRD */

    for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
         idx++) {
        rd_flag = 0;
        if (type == CFE_MI_AVAILABLE) {
            /*
             * See if this block contains (any portion of) the
             * ramdisk
             */
#ifdef CONFIG_BLK_DEV_INITRD
            if (initrd_start) {
                if ((initrd_pstart > addr) &&
                    (initrd_pstart < (addr + size))) {
                    add_memory_region(addr,
                                      initrd_pstart - addr,
                                      BOOT_MEM_RAM);
                    rd_flag = 1;
                }
                if ((initrd_pend > addr) &&
                    (initrd_pend < (addr + size))) {
                    add_memory_region(initrd_pend,
                        (addr + size) - initrd_pend,
                         BOOT_MEM_RAM);
                    rd_flag = 1;
                }
            }
#endif
            if (!rd_flag) {
                if (addr > MAX_RAM_SIZE)
                    continue;
                if (addr+size > MAX_RAM_SIZE)
                    size = MAX_RAM_SIZE - (addr+size) + 1;
                /*
                 * memcpy/__copy_user prefetch, which
                 * will cause a bus error for
                 * KSEG/KUSEG addrs not backed by RAM.
                 * Hence, reserve some padding for the
                 * prefetch distance.
                 */
                if (size > 512)
                    size -= 512;
                add_memory_region(addr, size, BOOT_MEM_RAM);
            }
            board_mem_region_addrs[board_mem_region_count] = addr;
            board_mem_region_sizes[board_mem_region_count] = size;
            board_mem_region_count++;
            if (board_mem_region_count ==
                SIBYTE_MAX_MEM_REGIONS) {
                /*
                 * Too many regions.  Need to configure more
                 */
                while(1);
            }
        }
    }
#ifdef CONFIG_BLK_DEV_INITRD
    if (initrd_start) {
        add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
                  BOOT_MEM_RESERVED);
    }
#endif
}

#ifdef CONFIG_BLK_DEV_INITRD
static int __init initrd_setup(char *str)
{
    char rdarg[64];
    int idx;
    char *tmp, *endptr;
    unsigned long initrd_size;

    /* Make a copy of the initrd argument so we can smash it up here */
    for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
        if (!str[idx] || (str[idx] == ' ')) break;
        rdarg[idx] = str[idx];
    }

    rdarg[idx] = 0;
    str = rdarg;

    /*
     *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
     *  e.g. initrd=3abfd@80010000.  This is set up by the loader.
     */
    for (tmp = str; *tmp != '@'; tmp++) {
        if (!*tmp) {
            goto fail;
        }
    }
    *tmp = 0;
    tmp++;
    if (!*tmp) {
        goto fail;
    }
    initrd_size = simple_strtoul(str, &endptr, 16);
    if (*endptr) {
        *(tmp-1) = '@';
        goto fail;
    }
    *(tmp-1) = '@';
    initrd_start = simple_strtoul(tmp, &endptr, 16);
    if (*endptr) {
        goto fail;
    }
    initrd_end = initrd_start + initrd_size;
    printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
    return 1;
 fail:
    printk("Bad initrd argument.  Disabling initrd\n");
    initrd_start = 0;
    initrd_end = 0;
    return 1;
}

#endif

extern struct plat_smp_ops sb_smp_ops;
extern struct plat_smp_ops bcm1480_smp_ops;

/*
 * prom_init is called just after the cpu type is determined, from setup_arch()
 */
void __init prom_init(void)
{
    uint64_t cfe_ept, cfe_handle;
    unsigned int cfe_eptseal;
    int argc = fw_arg0;
    char **envp = (char **) fw_arg2;
    int *prom_vec = (int *) fw_arg3;

    _machine_restart   = cfe_linux_restart;
    _machine_halt      = cfe_linux_halt;
    pm_power_off = cfe_linux_halt;

    /*
     * Check if a loader was used; if NOT, the 4 arguments are
     * what CFE gives us (handle, 0, EPT and EPTSEAL)
     */
    if (argc < 0) {
        cfe_handle = (uint64_t)(long)argc;
        cfe_ept = (long)envp;
        cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
    } else {
        if ((int32_t)(long)prom_vec < 0) {
            /*
             * Old loader; all it gives us is the handle,
             * so use the "known" entrypoint and assume
             * the seal.
             */
            cfe_handle = (uint64_t)(long)prom_vec;
            cfe_ept = (uint64_t)((int32_t)0x9fc00500);
            cfe_eptseal = CFE_EPTSEAL;
        } else {
            /*
             * Newer loaders bundle the handle/ept/eptseal
             * Note: prom_vec is in the loader's useg
             * which is still alive in the TLB.
             */
            cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
            cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
            cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
        }
    }
    if (cfe_eptseal != CFE_EPTSEAL) {
        /* too early for panic to do any good */
        printk("CFE's entrypoint seal doesn't match. Spinning.");
        while (1) ;
    }
    cfe_init(cfe_handle, cfe_ept);
    /*
     * Get the handle for (at least) prom_putchar, possibly for
     * boot console
     */
    cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
    if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
        if (argc >= 0) {
            /* The loader should have set the command line */
            /* too early for panic to do any good */
            printk("LINUX_CMDLINE not defined in cfe.");
            while (1) ;
        }
    }

#ifdef CONFIG_BLK_DEV_INITRD
    {
        char *ptr;
        /* Need to find out early whether we've got an initrd.  So scan
           the list looking now */
        for (ptr = arcs_cmdline; *ptr; ptr++) {
            while (*ptr == ' ') {
                ptr++;
            }
            if (!strncmp(ptr, "initrd=", 7)) {
                initrd_setup(ptr+7);
                break;
            } else {
                while (*ptr && (*ptr != ' ')) {
                    ptr++;
                }
            }
        }
    }
#endif /* CONFIG_BLK_DEV_INITRD */

    /* Not sure this is needed, but it's the safe way. */
    arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;

    prom_meminit();

#if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
    register_smp_ops(&sb_smp_ops);
#endif
#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
    register_smp_ops(&bcm1480_smp_ops);
#endif
}

void __init prom_free_prom_memory(void)
{
    /* Not sure what I'm supposed to do here.  Nothing, I think */
}

void prom_putchar(char c)
{
    int ret;

    while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
        ;
}