linux/arch/powerpc/platforms/powernv/setup.c
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   1/*
   2 * PowerNV setup code.
   3 *
   4 * Copyright 2011 IBM Corp.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#undef DEBUG
  13
  14#include <linux/cpu.h>
  15#include <linux/errno.h>
  16#include <linux/sched.h>
  17#include <linux/kernel.h>
  18#include <linux/tty.h>
  19#include <linux/reboot.h>
  20#include <linux/init.h>
  21#include <linux/console.h>
  22#include <linux/delay.h>
  23#include <linux/irq.h>
  24#include <linux/seq_file.h>
  25#include <linux/of.h>
  26#include <linux/interrupt.h>
  27#include <linux/bug.h>
  28
  29#include <asm/machdep.h>
  30#include <asm/firmware.h>
  31#include <asm/xics.h>
  32#include <asm/rtas.h>
  33#include <asm/opal.h>
  34#include <asm/xics.h>
  35
  36#include "powernv.h"
  37
  38static void __init pnv_setup_arch(void)
  39{
  40        /* Initialize SMP */
  41        pnv_smp_init();
  42
  43        /* Setup PCI */
  44        pnv_pci_init();
  45
  46        /* Setup RTC and NVRAM callbacks */
  47        if (firmware_has_feature(FW_FEATURE_OPAL))
  48                opal_nvram_init();
  49
  50        /* Enable NAP mode */
  51        powersave_nap = 1;
  52
  53        /* XXX PMCS */
  54}
  55
  56static void __init pnv_init_early(void)
  57{
  58#ifdef CONFIG_HVC_OPAL
  59        if (firmware_has_feature(FW_FEATURE_OPAL))
  60                hvc_opal_init_early();
  61        else
  62#endif
  63                add_preferred_console("hvc", 0, NULL);
  64}
  65
  66static void __init pnv_init_IRQ(void)
  67{
  68        xics_init();
  69
  70        WARN_ON(!ppc_md.get_irq);
  71}
  72
  73static void pnv_show_cpuinfo(struct seq_file *m)
  74{
  75        struct device_node *root;
  76        const char *model = "";
  77
  78        root = of_find_node_by_path("/");
  79        if (root)
  80                model = of_get_property(root, "model", NULL);
  81        seq_printf(m, "machine\t\t: PowerNV %s\n", model);
  82        if (firmware_has_feature(FW_FEATURE_OPALv2))
  83                seq_printf(m, "firmware\t: OPAL v2\n");
  84        else if (firmware_has_feature(FW_FEATURE_OPAL))
  85                seq_printf(m, "firmware\t: OPAL v1\n");
  86        else
  87                seq_printf(m, "firmware\t: BML\n");
  88        of_node_put(root);
  89}
  90
  91static void  __noreturn pnv_restart(char *cmd)
  92{
  93        long rc = OPAL_BUSY;
  94
  95        while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
  96                rc = opal_cec_reboot();
  97                if (rc == OPAL_BUSY_EVENT)
  98                        opal_poll_events(NULL);
  99                else
 100                        mdelay(10);
 101        }
 102        for (;;)
 103                opal_poll_events(NULL);
 104}
 105
 106static void __noreturn pnv_power_off(void)
 107{
 108        long rc = OPAL_BUSY;
 109
 110        while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 111                rc = opal_cec_power_down(0);
 112                if (rc == OPAL_BUSY_EVENT)
 113                        opal_poll_events(NULL);
 114                else
 115                        mdelay(10);
 116        }
 117        for (;;)
 118                opal_poll_events(NULL);
 119}
 120
 121static void __noreturn pnv_halt(void)
 122{
 123        pnv_power_off();
 124}
 125
 126static void pnv_progress(char *s, unsigned short hex)
 127{
 128}
 129
 130#ifdef CONFIG_KEXEC
 131static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 132{
 133        xics_kexec_teardown_cpu(secondary);
 134}
 135#endif /* CONFIG_KEXEC */
 136
 137static void __init pnv_setup_machdep_opal(void)
 138{
 139        ppc_md.get_boot_time = opal_get_boot_time;
 140        ppc_md.get_rtc_time = opal_get_rtc_time;
 141        ppc_md.set_rtc_time = opal_set_rtc_time;
 142        ppc_md.restart = pnv_restart;
 143        ppc_md.power_off = pnv_power_off;
 144        ppc_md.halt = pnv_halt;
 145        ppc_md.machine_check_exception = opal_machine_check;
 146}
 147
 148#ifdef CONFIG_PPC_POWERNV_RTAS
 149static void __init pnv_setup_machdep_rtas(void)
 150{
 151        if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
 152                ppc_md.get_boot_time = rtas_get_boot_time;
 153                ppc_md.get_rtc_time = rtas_get_rtc_time;
 154                ppc_md.set_rtc_time = rtas_set_rtc_time;
 155        }
 156        ppc_md.restart = rtas_restart;
 157        ppc_md.power_off = rtas_power_off;
 158        ppc_md.halt = rtas_halt;
 159}
 160#endif /* CONFIG_PPC_POWERNV_RTAS */
 161
 162static int __init pnv_probe(void)
 163{
 164        unsigned long root = of_get_flat_dt_root();
 165
 166        if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
 167                return 0;
 168
 169        hpte_init_native();
 170
 171        if (firmware_has_feature(FW_FEATURE_OPAL))
 172                pnv_setup_machdep_opal();
 173#ifdef CONFIG_PPC_POWERNV_RTAS
 174        else if (rtas.base)
 175                pnv_setup_machdep_rtas();
 176#endif /* CONFIG_PPC_POWERNV_RTAS */
 177
 178        pr_debug("PowerNV detected !\n");
 179
 180        return 1;
 181}
 182
 183define_machine(powernv) {
 184        .name                   = "PowerNV",
 185        .probe                  = pnv_probe,
 186        .init_early             = pnv_init_early,
 187        .setup_arch             = pnv_setup_arch,
 188        .init_IRQ               = pnv_init_IRQ,
 189        .show_cpuinfo           = pnv_show_cpuinfo,
 190        .progress               = pnv_progress,
 191        .power_save             = power7_idle,
 192        .calibrate_decr         = generic_calibrate_decr,
 193#ifdef CONFIG_KEXEC
 194        .kexec_cpu_down         = pnv_kexec_cpu_down,
 195#endif
 196};
 197