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/kexec.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         /*
  59          * Initialize the LPC bus now so that legacy serial
  60          * ports can be found on it
  61          */
  62         opal_lpc_init();
  63
  64 #ifdef CONFIG_HVC_OPAL
  65         if (firmware_has_feature(FW_FEATURE_OPAL))
  66                 hvc_opal_init_early();
  67         else
  68 #endif
  69                 add_preferred_console("hvc", 0, NULL);
  70 }
  71
  72 static void __init pnv_init_IRQ(void)
  73 {
  74         xics_init();
  75
  76         WARN_ON(!ppc_md.get_irq);
  77 }
  78
  79 static void pnv_show_cpuinfo(struct seq_file *m)
  80 {
  81         struct device_node *root;
  82         const char *model = "";
  83
  84         root = of_find_node_by_path("/");
  85         if (root)
  86                 model = of_get_property(root, "model", NULL);
  87         seq_printf(m, "machine\t\t: PowerNV %s\n", model);
  88         if (firmware_has_feature(FW_FEATURE_OPALv3))
  89                 seq_printf(m, "firmware\t: OPAL v3\n");
  90         else if (firmware_has_feature(FW_FEATURE_OPALv2))
  91                 seq_printf(m, "firmware\t: OPAL v2\n");
  92         else if (firmware_has_feature(FW_FEATURE_OPAL))
  93                 seq_printf(m, "firmware\t: OPAL v1\n");
  94         else
  95                 seq_printf(m, "firmware\t: BML\n");
  96         of_node_put(root);
  97 }
  98
  99 static void  __noreturn pnv_restart(char *cmd)
 100 {
 101         long rc = OPAL_BUSY;
 102
 103         opal_notifier_disable();
 104
 105         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 106                 rc = opal_cec_reboot();
 107                 if (rc == OPAL_BUSY_EVENT)
 108                         opal_poll_events(NULL);
 109                 else
 110                         mdelay(10);
 111         }
 112         for (;;)
 113                 opal_poll_events(NULL);
 114 }
 115
 116 static void __noreturn pnv_power_off(void)
 117 {
 118         long rc = OPAL_BUSY;
 119
 120         opal_notifier_disable();
 121
 122         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 123                 rc = opal_cec_power_down(0);
 124                 if (rc == OPAL_BUSY_EVENT)
 125                         opal_poll_events(NULL);
 126                 else
 127                         mdelay(10);
 128         }
 129         for (;;)
 130                 opal_poll_events(NULL);
 131 }
 132
 133 static void __noreturn pnv_halt(void)
 134 {
 135         pnv_power_off();
 136 }
 137
 138 static void pnv_progress(char *s, unsigned short hex)
 139 {
 140 }
 141
 142 static void pnv_shutdown(void)
 143 {
 144         /* Let the PCI code clear up IODA tables */
 145         pnv_pci_shutdown();
 146
 147         /* And unregister all OPAL interrupts so they don't fire
 148          * up while we kexec
 149          */
 150         opal_shutdown();
 151 }
 152
 153 #ifdef CONFIG_KEXEC
 154 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 155 {
 156         xics_kexec_teardown_cpu(secondary);
 157
 158         /* Return secondary CPUs to firmware on OPAL v3 */
 159         if (firmware_has_feature(FW_FEATURE_OPALv3) && secondary) {
 160                 mb();
 161                 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
 162                 mb();
 163
 164                 /* Return the CPU to OPAL */
 165                 opal_return_cpu();
 166         }
 167 }
 168 #endif /* CONFIG_KEXEC */
 169
 170 static void __init pnv_setup_machdep_opal(void)
 171 {
 172         ppc_md.get_boot_time = opal_get_boot_time;
 173         ppc_md.get_rtc_time = opal_get_rtc_time;
 174         ppc_md.set_rtc_time = opal_set_rtc_time;
 175         ppc_md.restart = pnv_restart;
 176         ppc_md.power_off = pnv_power_off;
 177         ppc_md.halt = pnv_halt;
 178         ppc_md.machine_check_exception = opal_machine_check;
 179 }
 180
 181 #ifdef CONFIG_PPC_POWERNV_RTAS
 182 static void __init pnv_setup_machdep_rtas(void)
 183 {
 184         if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
 185                 ppc_md.get_boot_time = rtas_get_boot_time;
 186                 ppc_md.get_rtc_time = rtas_get_rtc_time;
 187                 ppc_md.set_rtc_time = rtas_set_rtc_time;
 188         }
 189         ppc_md.restart = rtas_restart;
 190         ppc_md.power_off = rtas_power_off;
 191         ppc_md.halt = rtas_halt;
 192 }
 193 #endif /* CONFIG_PPC_POWERNV_RTAS */
 194
 195 static int __init pnv_probe(void)
 196 {
 197         unsigned long root = of_get_flat_dt_root();
 198
 199         if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
 200                 return 0;
 201
 202         hpte_init_native();
 203
 204         if (firmware_has_feature(FW_FEATURE_OPAL))
 205                 pnv_setup_machdep_opal();
 206 #ifdef CONFIG_PPC_POWERNV_RTAS
 207         else if (rtas.base)
 208                 pnv_setup_machdep_rtas();
 209 #endif /* CONFIG_PPC_POWERNV_RTAS */
 210
 211         pr_debug("PowerNV detected !\n");
 212
 213         return 1;
 214 }
 215
 216 define_machine(powernv) {
 217         .name                   = "PowerNV",
 218         .probe                  = pnv_probe,
 219         .init_early             = pnv_init_early,
 220         .setup_arch             = pnv_setup_arch,
 221         .init_IRQ               = pnv_init_IRQ,
 222         .show_cpuinfo           = pnv_show_cpuinfo,
 223         .progress               = pnv_progress,
 224         .machine_shutdown       = pnv_shutdown,
 225         .power_save             = power7_idle,
 226         .calibrate_decr         = generic_calibrate_decr,
 227 #ifdef CONFIG_KEXEC
 228         .kexec_cpu_down         = pnv_kexec_cpu_down,
 229 #endif
 230 };