arch/powerpc/platforms/powernv/setup.c

   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
  38 static 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
  56 static 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
  66 static void __init pnv_init_IRQ(void)
  67 {
  68         xics_init();
  69
  70         WARN_ON(!ppc_md.get_irq);
  71 }
  72
  73 static 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
  91 static 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
 106 static 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
 121 static void __noreturn pnv_halt(void)
 122 {
 123         pnv_power_off();
 124 }
 125
 126 static void pnv_progress(char *s, unsigned short hex)
 127 {
 128 }
 129
 130 #ifdef CONFIG_KEXEC
 131 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 132 {
 133         xics_kexec_teardown_cpu(secondary);
 134 }
 135 #endif /* CONFIG_KEXEC */
 136
 137 static 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
 149 static 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
 162 static 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
 183 define_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 };