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/of_fdt.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/bug.h>
  29
  30 #include <asm/machdep.h>
  31 #include <asm/firmware.h>
  32 #include <asm/xics.h>
  33 #include <asm/rtas.h>
  34 #include <asm/opal.h>
  35 #include <asm/kexec.h>
  36
  37 #include "powernv.h"
  38
  39 static void __init pnv_setup_arch(void)
  40 {
  41         /* Initialize SMP */
  42         pnv_smp_init();
  43
  44         /* Setup PCI */
  45         pnv_pci_init();
  46
  47         /* Setup RTC and NVRAM callbacks */
  48         if (firmware_has_feature(FW_FEATURE_OPAL))
  49                 opal_nvram_init();
  50
  51         /* Enable NAP mode */
  52         powersave_nap = 1;
  53
  54         /* XXX PMCS */
  55 }
  56
  57 static void __init pnv_init_early(void)
  58 {
  59         /*
  60          * Initialize the LPC bus now so that legacy serial
  61          * ports can be found on it
  62          */
  63         opal_lpc_init();
  64
  65 #ifdef CONFIG_HVC_OPAL
  66         if (firmware_has_feature(FW_FEATURE_OPAL))
  67                 hvc_opal_init_early();
  68         else
  69 #endif
  70                 add_preferred_console("hvc", 0, NULL);
  71 }
  72
  73 static void __init pnv_init_IRQ(void)
  74 {
  75         xics_init();
  76
  77         WARN_ON(!ppc_md.get_irq);
  78 }
  79
  80 static void pnv_show_cpuinfo(struct seq_file *m)
  81 {
  82         struct device_node *root;
  83         const char *model = "";
  84
  85         root = of_find_node_by_path("/");
  86         if (root)
  87                 model = of_get_property(root, "model", NULL);
  88         seq_printf(m, "machine\t\t: PowerNV %s\n", model);
  89         if (firmware_has_feature(FW_FEATURE_OPALv3))
  90                 seq_printf(m, "firmware\t: OPAL v3\n");
  91         else if (firmware_has_feature(FW_FEATURE_OPALv2))
  92                 seq_printf(m, "firmware\t: OPAL v2\n");
  93         else if (firmware_has_feature(FW_FEATURE_OPAL))
  94                 seq_printf(m, "firmware\t: OPAL v1\n");
  95         else
  96                 seq_printf(m, "firmware\t: BML\n");
  97         of_node_put(root);
  98 }
  99
 100 static void  __noreturn pnv_restart(char *cmd)
 101 {
 102         long rc = OPAL_BUSY;
 103
 104         opal_notifier_disable();
 105
 106         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 107                 rc = opal_cec_reboot();
 108                 if (rc == OPAL_BUSY_EVENT)
 109                         opal_poll_events(NULL);
 110                 else
 111                         mdelay(10);
 112         }
 113         for (;;)
 114                 opal_poll_events(NULL);
 115 }
 116
 117 static void __noreturn pnv_power_off(void)
 118 {
 119         long rc = OPAL_BUSY;
 120
 121         opal_notifier_disable();
 122
 123         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 124                 rc = opal_cec_power_down(0);
 125                 if (rc == OPAL_BUSY_EVENT)
 126                         opal_poll_events(NULL);
 127                 else
 128                         mdelay(10);
 129         }
 130         for (;;)
 131                 opal_poll_events(NULL);
 132 }
 133
 134 static void __noreturn pnv_halt(void)
 135 {
 136         pnv_power_off();
 137 }
 138
 139 static void pnv_progress(char *s, unsigned short hex)
 140 {
 141 }
 142
 143 static void pnv_shutdown(void)
 144 {
 145         /* Let the PCI code clear up IODA tables */
 146         pnv_pci_shutdown();
 147
 148         /* And unregister all OPAL interrupts so they don't fire
 149          * up while we kexec
 150          */
 151         opal_shutdown();
 152 }
 153
 154 #ifdef CONFIG_KEXEC
 155 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 156 {
 157         xics_kexec_teardown_cpu(secondary);
 158
 159         /* Return secondary CPUs to firmware on OPAL v3 */
 160         if (firmware_has_feature(FW_FEATURE_OPALv3) && secondary) {
 161                 mb();
 162                 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
 163                 mb();
 164
 165                 /* Return the CPU to OPAL */
 166                 opal_return_cpu();
 167         }
 168 }
 169 #endif /* CONFIG_KEXEC */
 170
 171 static void __init pnv_setup_machdep_opal(void)
 172 {
 173         ppc_md.get_boot_time = opal_get_boot_time;
 174         ppc_md.get_rtc_time = opal_get_rtc_time;
 175         ppc_md.set_rtc_time = opal_set_rtc_time;
 176         ppc_md.restart = pnv_restart;
 177         ppc_md.power_off = pnv_power_off;
 178         ppc_md.halt = pnv_halt;
 179         ppc_md.machine_check_exception = opal_machine_check;
 180 }
 181
 182 #ifdef CONFIG_PPC_POWERNV_RTAS
 183 static void __init pnv_setup_machdep_rtas(void)
 184 {
 185         if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
 186                 ppc_md.get_boot_time = rtas_get_boot_time;
 187                 ppc_md.get_rtc_time = rtas_get_rtc_time;
 188                 ppc_md.set_rtc_time = rtas_set_rtc_time;
 189         }
 190         ppc_md.restart = rtas_restart;
 191         ppc_md.power_off = rtas_power_off;
 192         ppc_md.halt = rtas_halt;
 193 }
 194 #endif /* CONFIG_PPC_POWERNV_RTAS */
 195
 196 static int __init pnv_probe(void)
 197 {
 198         unsigned long root = of_get_flat_dt_root();
 199
 200         if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
 201                 return 0;
 202
 203         hpte_init_native();
 204
 205         if (firmware_has_feature(FW_FEATURE_OPAL))
 206                 pnv_setup_machdep_opal();
 207 #ifdef CONFIG_PPC_POWERNV_RTAS
 208         else if (rtas.base)
 209                 pnv_setup_machdep_rtas();
 210 #endif /* CONFIG_PPC_POWERNV_RTAS */
 211
 212         pr_debug("PowerNV detected !\n");
 213
 214         return 1;
 215 }
 216
 217 define_machine(powernv) {
 218         .name                   = "PowerNV",
 219         .probe                  = pnv_probe,
 220         .init_early             = pnv_init_early,
 221         .setup_arch             = pnv_setup_arch,
 222         .init_IRQ               = pnv_init_IRQ,
 223         .show_cpuinfo           = pnv_show_cpuinfo,
 224         .progress               = pnv_progress,
 225         .machine_shutdown       = pnv_shutdown,
 226         .power_save             = power7_idle,
 227         .calibrate_decr         = generic_calibrate_decr,
 228 #ifdef CONFIG_KEXEC
 229         .kexec_cpu_down         = pnv_kexec_cpu_down,
 230 #endif
 231 };