setup.c

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/*
 * PowerNV setup code.
 *
 * Copyright 2011 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/cpu.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/of.h>
#include <linux/interrupt.h>
#include <linux/bug.h>

#include <asm/machdep.h>
#include <asm/firmware.h>
#include <asm/xics.h>
#include <asm/rtas.h>
#include <asm/opal.h>

#include "powernv.h"

static void __init pnv_setup_arch(void)
{
    /* Initialize SMP */
    pnv_smp_init();

    /* Setup PCI */
    pnv_pci_init();

    /* Setup RTC and NVRAM callbacks */
    if (firmware_has_feature(FW_FEATURE_OPAL))
        opal_nvram_init();

    /* Enable NAP mode */
    powersave_nap = 1;

    /* XXX PMCS */
}

static void __init pnv_init_early(void)
{
#ifdef CONFIG_HVC_OPAL
    if (firmware_has_feature(FW_FEATURE_OPAL))
        hvc_opal_init_early();
    else
#endif
        add_preferred_console("hvc", 0, NULL);
}

static void __init pnv_init_IRQ(void)
{
    xics_init();

    WARN_ON(!ppc_md.get_irq);
}

static void pnv_show_cpuinfo(struct seq_file *m)
{
    struct device_node *root;
    const char *model = "";

    root = of_find_node_by_path("/");
    if (root)
        model = of_get_property(root, "model", NULL);
    seq_printf(m, "machine\t\t: PowerNV %s\n", model);
    if (firmware_has_feature(FW_FEATURE_OPALv2))
        seq_printf(m, "firmware\t: OPAL v2\n");
    else if (firmware_has_feature(FW_FEATURE_OPAL))
        seq_printf(m, "firmware\t: OPAL v1\n");
    else
        seq_printf(m, "firmware\t: BML\n");
    of_node_put(root);
}

static void  __noreturn pnv_restart(char *cmd)
{
    long rc = OPAL_BUSY;

    while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
        rc = opal_cec_reboot();
        if (rc == OPAL_BUSY_EVENT)
            opal_poll_events(NULL);
        else
            mdelay(10);
    }
    for (;;)
        opal_poll_events(NULL);
}

static void __noreturn pnv_power_off(void)
{
    long rc = OPAL_BUSY;

    while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
        rc = opal_cec_power_down(0);
        if (rc == OPAL_BUSY_EVENT)
            opal_poll_events(NULL);
        else
            mdelay(10);
    }
    for (;;)
        opal_poll_events(NULL);
}

static void __noreturn pnv_halt(void)
{
    pnv_power_off();
}

static void pnv_progress(char *s, unsigned short hex)
{
}

#ifdef CONFIG_KEXEC
static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
{
    xics_kexec_teardown_cpu(secondary);
}
#endif /* CONFIG_KEXEC */

static void __init pnv_setup_machdep_opal(void)
{
    ppc_md.get_boot_time = opal_get_boot_time;
    ppc_md.get_rtc_time = opal_get_rtc_time;
    ppc_md.set_rtc_time = opal_set_rtc_time;
    ppc_md.restart = pnv_restart;
    ppc_md.power_off = pnv_power_off;
    ppc_md.halt = pnv_halt;
    ppc_md.machine_check_exception = opal_machine_check;
}

#ifdef CONFIG_PPC_POWERNV_RTAS
static void __init pnv_setup_machdep_rtas(void)
{
    if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
        ppc_md.get_boot_time = rtas_get_boot_time;
        ppc_md.get_rtc_time = rtas_get_rtc_time;
        ppc_md.set_rtc_time = rtas_set_rtc_time;
    }
    ppc_md.restart = rtas_restart;
    ppc_md.power_off = rtas_power_off;
    ppc_md.halt = rtas_halt;
}
#endif /* CONFIG_PPC_POWERNV_RTAS */

static int __init pnv_probe(void)
{
    unsigned long root = of_get_flat_dt_root();

    if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
        return 0;

    hpte_init_native();

    if (firmware_has_feature(FW_FEATURE_OPAL))
        pnv_setup_machdep_opal();
#ifdef CONFIG_PPC_POWERNV_RTAS
    else if (rtas.base)
        pnv_setup_machdep_rtas();
#endif /* CONFIG_PPC_POWERNV_RTAS */

    pr_debug("PowerNV detected !\n");

    return 1;
}

define_machine(powernv) {
    .name           = "PowerNV",
    .probe          = pnv_probe,
    .init_early     = pnv_init_early,
    .setup_arch     = pnv_setup_arch,
    .init_IRQ       = pnv_init_IRQ,
    .show_cpuinfo       = pnv_show_cpuinfo,
    .progress       = pnv_progress,
    .power_save             = power7_idle,
    .calibrate_decr     = generic_calibrate_decr,
#ifdef CONFIG_KEXEC
    .kexec_cpu_down     = pnv_kexec_cpu_down,
#endif
};