setup.c

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/*
 *  Maple (970 eval board) setup code
 *
 *  (c) Copyright 2004 Benjamin Herrenschmidt ([email protected]),
 *                     IBM Corp. 
 *
 *  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.
 *
 */

#undef DEBUG

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/export.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/string.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/initrd.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/serial.h>
#include <linux/smp.h>
#include <linux/bitops.h>
#include <linux/of_device.h>
#include <linux/memblock.h>

#include <asm/processor.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/iommu.h>
#include <asm/machdep.h>
#include <asm/dma.h>
#include <asm/cputable.h>
#include <asm/time.h>
#include <asm/mpic.h>
#include <asm/rtas.h>
#include <asm/udbg.h>
#include <asm/nvram.h>

#include "maple.h"

#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

static unsigned long maple_find_nvram_base(void)
{
    struct device_node *rtcs;
    unsigned long result = 0;

    /* find NVRAM device */
    rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
    if (rtcs) {
        struct resource r;
        if (of_address_to_resource(rtcs, 0, &r)) {
            printk(KERN_EMERG "Maple: Unable to translate NVRAM"
                   " address\n");
            goto bail;
        }
        if (!(r.flags & IORESOURCE_IO)) {
            printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
            goto bail;
        }
        result = r.start;
    } else
        printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
 bail:
    of_node_put(rtcs);
    return result;
}

static void maple_restart(char *cmd)
{
    unsigned int maple_nvram_base;
    const unsigned int *maple_nvram_offset, *maple_nvram_command;
    struct device_node *sp;

    maple_nvram_base = maple_find_nvram_base();
    if (maple_nvram_base == 0)
        goto fail;

    /* find service processor device */
    sp = of_find_node_by_name(NULL, "service-processor");
    if (!sp) {
        printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
        goto fail;
    }
    maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
    maple_nvram_command = of_get_property(sp, "restart-value", NULL);
    of_node_put(sp);

    /* send command */
    outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
    for (;;) ;
 fail:
    printk(KERN_EMERG "Maple: Manual Restart Required\n");
}

static void maple_power_off(void)
{
    unsigned int maple_nvram_base;
    const unsigned int *maple_nvram_offset, *maple_nvram_command;
    struct device_node *sp;

    maple_nvram_base = maple_find_nvram_base();
    if (maple_nvram_base == 0)
        goto fail;

    /* find service processor device */
    sp = of_find_node_by_name(NULL, "service-processor");
    if (!sp) {
        printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
        goto fail;
    }
    maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
    maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
    of_node_put(sp);

    /* send command */
    outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
    for (;;) ;
 fail:
    printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
}

static void maple_halt(void)
{
    maple_power_off();
}

#ifdef CONFIG_SMP
struct smp_ops_t maple_smp_ops = {
    .probe      = smp_mpic_probe,
    .message_pass   = smp_mpic_message_pass,
    .kick_cpu   = smp_generic_kick_cpu,
    .setup_cpu  = smp_mpic_setup_cpu,
    .give_timebase  = smp_generic_give_timebase,
    .take_timebase  = smp_generic_take_timebase,
};
#endif /* CONFIG_SMP */

static void __init maple_use_rtas_reboot_and_halt_if_present(void)
{
    if (rtas_service_present("system-reboot") &&
        rtas_service_present("power-off")) {
        ppc_md.restart = rtas_restart;
        ppc_md.power_off = rtas_power_off;
        ppc_md.halt = rtas_halt;
    }
}

void __init maple_setup_arch(void)
{
    /* init to some ~sane value until calibrate_delay() runs */
    loops_per_jiffy = 50000000;

    /* Setup SMP callback */
#ifdef CONFIG_SMP
    smp_ops = &maple_smp_ops;
#endif
    /* Lookup PCI hosts */
        maple_pci_init();

#ifdef CONFIG_DUMMY_CONSOLE
    conswitchp = &dummy_con;
#endif
    maple_use_rtas_reboot_and_halt_if_present();

    printk(KERN_DEBUG "Using native/NAP idle loop\n");

    mmio_nvram_init();
}

/* 
 * Early initialization.
 */
static void __init maple_init_early(void)
{
    DBG(" -> maple_init_early\n");

    iommu_init_early_dart();

    DBG(" <- maple_init_early\n");
}

/*
 * This is almost identical to pSeries and CHRP. We need to make that
 * code generic at one point, with appropriate bits in the device-tree to
 * identify the presence of an HT APIC
 */
static void __init maple_init_IRQ(void)
{
    struct device_node *root, *np, *mpic_node = NULL;
    const unsigned int *opprop;
    unsigned long openpic_addr = 0;
    int naddr, n, i, opplen, has_isus = 0;
    struct mpic *mpic;
    unsigned int flags = 0;

    /* Locate MPIC in the device-tree. Note that there is a bug
     * in Maple device-tree where the type of the controller is
     * open-pic and not interrupt-controller
     */

    for_each_node_by_type(np, "interrupt-controller")
        if (of_device_is_compatible(np, "open-pic")) {
            mpic_node = np;
            break;
        }
    if (mpic_node == NULL)
        for_each_node_by_type(np, "open-pic") {
            mpic_node = np;
            break;
        }
    if (mpic_node == NULL) {
        printk(KERN_ERR
               "Failed to locate the MPIC interrupt controller\n");
        return;
    }

    /* Find address list in /platform-open-pic */
    root = of_find_node_by_path("/");
    naddr = of_n_addr_cells(root);
    opprop = of_get_property(root, "platform-open-pic", &opplen);
    if (opprop != 0) {
        openpic_addr = of_read_number(opprop, naddr);
        has_isus = (opplen > naddr);
        printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
               openpic_addr, has_isus);
    }

    BUG_ON(openpic_addr == 0);

    /* Check for a big endian MPIC */
    if (of_get_property(np, "big-endian", NULL) != NULL)
        flags |= MPIC_BIG_ENDIAN;

    /* XXX Maple specific bits */
    flags |= MPIC_U3_HT_IRQS;
    /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
    flags |= MPIC_BIG_ENDIAN;

    /* Setup the openpic driver. More device-tree junks, we hard code no
     * ISUs for now. I'll have to revisit some stuffs with the folks doing
     * the firmware for those
     */
    mpic = mpic_alloc(mpic_node, openpic_addr, flags,
              /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
    BUG_ON(mpic == NULL);

    /* Add ISUs */
    opplen /= sizeof(u32);
    for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
        unsigned long isuaddr = of_read_number(opprop + i, naddr);
        mpic_assign_isu(mpic, n, isuaddr);
    }

    /* All ISUs are setup, complete initialization */
    mpic_init(mpic);
    ppc_md.get_irq = mpic_get_irq;
    of_node_put(mpic_node);
    of_node_put(root);
}

static void __init maple_progress(char *s, unsigned short hex)
{
    printk("*** %04x : %s\n", hex, s ? s : "");
}


/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */
static int __init maple_probe(void)
{
    unsigned long root = of_get_flat_dt_root();

    if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
        !of_flat_dt_is_compatible(root, "Momentum,Apache"))
        return 0;
    /*
     * On U3, the DART (iommu) must be allocated now since it
     * has an impact on htab_initialize (due to the large page it
     * occupies having to be broken up so the DART itself is not
     * part of the cacheable linar mapping
     */
    alloc_dart_table();

    hpte_init_native();

    return 1;
}

define_machine(maple) {
    .name           = "Maple",
    .probe          = maple_probe,
    .setup_arch     = maple_setup_arch,
    .init_early     = maple_init_early,
    .init_IRQ       = maple_init_IRQ,
    .pci_irq_fixup      = maple_pci_irq_fixup,
    .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
    .restart        = maple_restart,
    .power_off      = maple_power_off,
    .halt           = maple_halt,
        .get_boot_time      = maple_get_boot_time,
        .set_rtc_time       = maple_set_rtc_time,
        .get_rtc_time       = maple_get_rtc_time,
        .calibrate_decr     = generic_calibrate_decr,
    .progress       = maple_progress,
    .power_save     = power4_idle,
};

#ifdef CONFIG_EDAC
/*
 * Register a platform device for CPC925 memory controller on
 * all boards with U3H (CPC925) bridge.
 */
static int __init maple_cpc925_edac_setup(void)
{
    struct platform_device *pdev;
    struct device_node *np = NULL;
    struct resource r;
    int ret;
    volatile void __iomem *mem;
    u32 rev;

    np = of_find_node_by_type(NULL, "memory-controller");
    if (!np) {
        printk(KERN_ERR "%s: Unable to find memory-controller node\n",
            __func__);
        return -ENODEV;
    }

    ret = of_address_to_resource(np, 0, &r);
    of_node_put(np);

    if (ret < 0) {
        printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
            __func__);
        return -ENODEV;
    }

    mem = ioremap(r.start, resource_size(&r));
    if (!mem) {
        printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
                __func__);
        return -ENOMEM;
    }

    rev = __raw_readl(mem);
    iounmap(mem);

    if (rev < 0x34 || rev > 0x3f) { /* U3H */
        printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
            __func__, rev);
        return 0;
    }

    pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
    if (IS_ERR(pdev))
        return PTR_ERR(pdev);

    printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);

    return 0;
}
machine_device_initcall(maple, maple_cpc925_edac_setup);
#endif