setup.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/module.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/string.h>

#include <asm/bootinfo.h>
#include <asm/mipsregs.h>
#include <asm/io.h>
#include <asm/sibyte/sb1250.h>
#include <asm/sibyte/sb1250_regs.h>
#include <asm/sibyte/sb1250_scd.h>

unsigned int sb1_pass;
unsigned int soc_pass;
unsigned int soc_type;
EXPORT_SYMBOL(soc_type);
unsigned int periph_rev;
unsigned int zbbus_mhz;
EXPORT_SYMBOL(zbbus_mhz);

static char *soc_str;
static char *pass_str;
static unsigned int war_pass;   /* XXXKW don't overload PASS defines? */

static int __init setup_bcm1250(void)
{
    int ret = 0;

    switch (soc_pass) {
    case K_SYS_REVISION_BCM1250_PASS1:
        periph_rev = 1;
        pass_str = "Pass 1";
        break;
    case K_SYS_REVISION_BCM1250_A10:
        periph_rev = 2;
        pass_str = "A8/A10";
        /* XXXKW different war_pass? */
        war_pass = K_SYS_REVISION_BCM1250_PASS2;
        break;
    case K_SYS_REVISION_BCM1250_PASS2_2:
        periph_rev = 2;
        pass_str = "B1";
        break;
    case K_SYS_REVISION_BCM1250_B2:
        periph_rev = 2;
        pass_str = "B2";
        war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
        break;
    case K_SYS_REVISION_BCM1250_PASS3:
        periph_rev = 3;
        pass_str = "C0";
        break;
    case K_SYS_REVISION_BCM1250_C1:
        periph_rev = 3;
        pass_str = "C1";
        break;
    default:
        if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
            periph_rev = 2;
            pass_str = "A0-A6";
            war_pass = K_SYS_REVISION_BCM1250_PASS2;
        } else {
            printk("Unknown BCM1250 rev %x\n", soc_pass);
            ret = 1;
        }
        break;
    }

    return ret;
}

int sb1250_m3_workaround_needed(void)
{
    switch (soc_type) {
    case K_SYS_SOC_TYPE_BCM1250:
    case K_SYS_SOC_TYPE_BCM1250_ALT:
    case K_SYS_SOC_TYPE_BCM1250_ALT2:
    case K_SYS_SOC_TYPE_BCM1125:
    case K_SYS_SOC_TYPE_BCM1125H:
        return soc_pass < K_SYS_REVISION_BCM1250_C0;

    default:
        return 0;
    }
}

static int __init setup_bcm112x(void)
{
    int ret = 0;

    switch (soc_pass) {
    case 0:
        /* Early build didn't have revid set */
        periph_rev = 3;
        pass_str = "A1";
        war_pass = K_SYS_REVISION_BCM112x_A1;
        break;
    case K_SYS_REVISION_BCM112x_A1:
        periph_rev = 3;
        pass_str = "A1";
        break;
    case K_SYS_REVISION_BCM112x_A2:
        periph_rev = 3;
        pass_str = "A2";
        break;
    case K_SYS_REVISION_BCM112x_A3:
        periph_rev = 3;
        pass_str = "A3";
        break;
    case K_SYS_REVISION_BCM112x_A4:
        periph_rev = 3;
        pass_str = "A4";
        break;
    case K_SYS_REVISION_BCM112x_B0:
        periph_rev = 3;
        pass_str = "B0";
        break;
    default:
        printk("Unknown %s rev %x\n", soc_str, soc_pass);
        ret = 1;
    }

    return ret;
}

/* Setup code likely to be common to all SiByte platforms */

static int __init sys_rev_decode(void)
{
    int ret = 0;

    war_pass = soc_pass;
    switch (soc_type) {
    case K_SYS_SOC_TYPE_BCM1250:
    case K_SYS_SOC_TYPE_BCM1250_ALT:
    case K_SYS_SOC_TYPE_BCM1250_ALT2:
        soc_str = "BCM1250";
        ret = setup_bcm1250();
        break;
    case K_SYS_SOC_TYPE_BCM1120:
        soc_str = "BCM1120";
        ret = setup_bcm112x();
        break;
    case K_SYS_SOC_TYPE_BCM1125:
        soc_str = "BCM1125";
        ret = setup_bcm112x();
        break;
    case K_SYS_SOC_TYPE_BCM1125H:
        soc_str = "BCM1125H";
        ret = setup_bcm112x();
        break;
    default:
        printk("Unknown SOC type %x\n", soc_type);
        ret = 1;
        break;
    }

    return ret;
}

void __init sb1250_setup(void)
{
    uint64_t sys_rev;
    int plldiv;
    int bad_config = 0;

    sb1_pass = read_c0_prid() & 0xff;
    sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
    soc_type = SYS_SOC_TYPE(sys_rev);
    soc_pass = G_SYS_REVISION(sys_rev);

    if (sys_rev_decode()) {
        printk("Restart after failure to identify SiByte chip\n");
        machine_restart(NULL);
    }

    plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
    zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);

    printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
            soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
    printk("Board type: %s\n", get_system_type());

    switch (war_pass) {
    case K_SYS_REVISION_BCM1250_PASS1:
#ifndef CONFIG_SB1_PASS_1_WORKAROUNDS
        printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
                    "and the kernel doesn't have the proper "
                    "workarounds compiled in. @@@@\n");
        bad_config = 1;
#endif
        break;
    case K_SYS_REVISION_BCM1250_PASS2:
        /* Pass 2 - easiest as default for now - so many numbers */
#if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
    !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
        printk("@@@@ This is a BCM1250 A3-A10 board, and the "
                    "kernel doesn't have the proper workarounds "
                    "compiled in. @@@@\n");
        bad_config = 1;
#endif
#ifdef CONFIG_CPU_HAS_PREFETCH
        printk("@@@@ Prefetches may be enabled in this kernel, "
                    "but are buggy on this board.  @@@@\n");
        bad_config = 1;
#endif
        break;
    case K_SYS_REVISION_BCM1250_PASS2_2:
#ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
        printk("@@@@ This is a BCM1250 B1/B2. board, and the "
                    "kernel doesn't have the proper workarounds "
                    "compiled in. @@@@\n");
        bad_config = 1;
#endif
#if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \
    !defined(CONFIG_CPU_HAS_PREFETCH)
        printk("@@@@ This is a BCM1250 B1/B2, but the kernel is "
                    "conservatively configured for an 'A' stepping. "
                    "@@@@\n");
#endif
        break;
    default:
        break;
    }
    if (bad_config) {
        printk("Invalid configuration for this chip.\n");
        machine_restart(NULL);
    }
}