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
  35 #include "powernv.h"
  36
  37 static void __init pnv_setup_arch(void)
  38 {
  39         /* Initialize SMP */
  40         pnv_smp_init();
  41
  42         /* Setup PCI */
  43         pnv_pci_init();
  44
  45         /* Setup RTC and NVRAM callbacks */
  46         if (firmware_has_feature(FW_FEATURE_OPAL))
  47                 opal_nvram_init();
  48
  49         /* Enable NAP mode */
  50         powersave_nap = 1;
  51
  52         /* XXX PMCS */
  53 }
  54
  55 static void __init pnv_init_early(void)
  56 {
  57 #ifdef CONFIG_HVC_OPAL
  58         if (firmware_has_feature(FW_FEATURE_OPAL))
  59                 hvc_opal_init_early();
  60         else
  61 #endif
  62                 add_preferred_console("hvc", 0, NULL);
  63 }
  64
  65 static void __init pnv_init_IRQ(void)
  66 {
  67         xics_init();
  68
  69         WARN_ON(!ppc_md.get_irq);
  70 }
  71
  72 static void pnv_show_cpuinfo(struct seq_file *m)
  73 {
  74         struct device_node *root;
  75         const char *model = "";
  76
  77         root = of_find_node_by_path("/");
  78         if (root)
  79                 model = of_get_property(root, "model", NULL);
  80         seq_printf(m, "machine\t\t: PowerNV %s\n", model);
  81         if (firmware_has_feature(FW_FEATURE_OPALv3))
  82                 seq_printf(m, "firmware\t: OPAL v3\n");
  83         else if (firmware_has_feature(FW_FEATURE_OPALv2))
  84                 seq_printf(m, "firmware\t: OPAL v2\n");
  85         else if (firmware_has_feature(FW_FEATURE_OPAL))
  86                 seq_printf(m, "firmware\t: OPAL v1\n");
  87         else
  88                 seq_printf(m, "firmware\t: BML\n");
  89         of_node_put(root);
  90 }
  91
  92 static void  __noreturn pnv_restart(char *cmd)
  93 {
  94         long rc = OPAL_BUSY;
  95
  96         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
  97                 rc = opal_cec_reboot();
  98                 if (rc == OPAL_BUSY_EVENT)
  99                         opal_poll_events(NULL);
 100                 else
 101                         mdelay(10);
 102         }
 103         for (;;)
 104                 opal_poll_events(NULL);
 105 }
 106
 107 static void __noreturn pnv_power_off(void)
 108 {
 109         long rc = OPAL_BUSY;
 110
 111         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 112                 rc = opal_cec_power_down(0);
 113                 if (rc == OPAL_BUSY_EVENT)
 114                         opal_poll_events(NULL);
 115                 else
 116                         mdelay(10);
 117         }
 118         for (;;)
 119                 opal_poll_events(NULL);
 120 }
 121
 122 static void __noreturn pnv_halt(void)
 123 {
 124         pnv_power_off();
 125 }
 126
 127 static void pnv_progress(char *s, unsigned short hex)
 128 {
 129 }
 130
 131 static void pnv_shutdown(void)
 132 {
 133         /* Let the PCI code clear up IODA tables */
 134         pnv_pci_shutdown();
 135
 136         /* And unregister all OPAL interrupts so they don't fire
 137          * up while we kexec
 138          */
 139         opal_shutdown();
 140 }
 141
 142 #ifdef CONFIG_KEXEC
 143 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 144 {
 145         xics_kexec_teardown_cpu(secondary);
 146 }
 147 #endif /* CONFIG_KEXEC */
 148
 149 static void __init pnv_setup_machdep_opal(void)
 150 {
 151         ppc_md.get_boot_time = opal_get_boot_time;
 152         ppc_md.get_rtc_time = opal_get_rtc_time;
 153         ppc_md.set_rtc_time = opal_set_rtc_time;
 154         ppc_md.restart = pnv_restart;
 155         ppc_md.power_off = pnv_power_off;
 156         ppc_md.halt = pnv_halt;
 157         ppc_md.machine_check_exception = opal_machine_check;
 158 }
 159
 160 #ifdef CONFIG_PPC_POWERNV_RTAS
 161 static void __init pnv_setup_machdep_rtas(void)
 162 {
 163         if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
 164                 ppc_md.get_boot_time = rtas_get_boot_time;
 165                 ppc_md.get_rtc_time = rtas_get_rtc_time;
 166                 ppc_md.set_rtc_time = rtas_set_rtc_time;
 167         }
 168         ppc_md.restart = rtas_restart;
 169         ppc_md.power_off = rtas_power_off;
 170         ppc_md.halt = rtas_halt;
 171 }
 172 #endif /* CONFIG_PPC_POWERNV_RTAS */
 173
 174 static int __init pnv_probe(void)
 175 {
 176         unsigned long root = of_get_flat_dt_root();
 177
 178         if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
 179                 return 0;
 180
 181         hpte_init_native();
 182
 183         if (firmware_has_feature(FW_FEATURE_OPAL))
 184                 pnv_setup_machdep_opal();
 185 #ifdef CONFIG_PPC_POWERNV_RTAS
 186         else if (rtas.base)
 187                 pnv_setup_machdep_rtas();
 188 #endif /* CONFIG_PPC_POWERNV_RTAS */
 189
 190         pr_debug("PowerNV detected !\n");
 191
 192         return 1;
 193 }
 194
 195 define_machine(powernv) {
 196         .name                   = "PowerNV",
 197         .probe                  = pnv_probe,
 198         .init_early             = pnv_init_early,
 199         .setup_arch             = pnv_setup_arch,
 200         .init_IRQ               = pnv_init_IRQ,
 201         .show_cpuinfo           = pnv_show_cpuinfo,
 202         .progress               = pnv_progress,
 203         .machine_shutdown       = pnv_shutdown,
 204         .power_save             = power7_idle,
 205         .calibrate_decr         = generic_calibrate_decr,
 206 #ifdef CONFIG_KEXEC
 207         .kexec_cpu_down         = pnv_kexec_cpu_down,
 208 #endif
 209 };