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 #include <linux/cpuidle.h>
  30 #include <linux/pci.h>
  31
  32 #include <asm/machdep.h>
  33 #include <asm/firmware.h>
  34 #include <asm/xics.h>
  35 #include <asm/rtas.h>
  36 #include <asm/opal.h>
  37 #include <asm/kexec.h>
  38
  39 #include "powernv.h"
  40
  41 static void __init pnv_setup_arch(void)
  42 {
  43         /* Initialize SMP */
  44         pnv_smp_init();
  45
  46         /* Setup PCI */
  47         pnv_pci_init();
  48
  49         /* Setup RTC and NVRAM callbacks */
  50         if (firmware_has_feature(FW_FEATURE_OPAL))
  51                 opal_nvram_init();
  52
  53         /* Enable NAP mode */
  54         powersave_nap = 1;
  55
  56         /* XXX PMCS */
  57 }
  58
  59 static void __init pnv_init_early(void)
  60 {
  61         /*
  62          * Initialize the LPC bus now so that legacy serial
  63          * ports can be found on it
  64          */
  65         opal_lpc_init();
  66
  67 #ifdef CONFIG_HVC_OPAL
  68         if (firmware_has_feature(FW_FEATURE_OPAL))
  69                 hvc_opal_init_early();
  70         else
  71 #endif
  72                 add_preferred_console("hvc", 0, NULL);
  73 }
  74
  75 static void __init pnv_init_IRQ(void)
  76 {
  77         xics_init();
  78
  79         WARN_ON(!ppc_md.get_irq);
  80 }
  81
  82 static void pnv_show_cpuinfo(struct seq_file *m)
  83 {
  84         struct device_node *root;
  85         const char *model = "";
  86
  87         root = of_find_node_by_path("/");
  88         if (root)
  89                 model = of_get_property(root, "model", NULL);
  90         seq_printf(m, "machine\t\t: PowerNV %s\n", model);
  91         if (firmware_has_feature(FW_FEATURE_OPALv3))
  92                 seq_printf(m, "firmware\t: OPAL v3\n");
  93         else if (firmware_has_feature(FW_FEATURE_OPALv2))
  94                 seq_printf(m, "firmware\t: OPAL v2\n");
  95         else if (firmware_has_feature(FW_FEATURE_OPAL))
  96                 seq_printf(m, "firmware\t: OPAL v1\n");
  97         else
  98                 seq_printf(m, "firmware\t: BML\n");
  99         of_node_put(root);
 100 }
 101
 102 static void  __noreturn pnv_restart(char *cmd)
 103 {
 104         long rc = OPAL_BUSY;
 105
 106         opal_notifier_disable();
 107
 108         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 109                 rc = opal_cec_reboot();
 110                 if (rc == OPAL_BUSY_EVENT)
 111                         opal_poll_events(NULL);
 112                 else
 113                         mdelay(10);
 114         }
 115         for (;;)
 116                 opal_poll_events(NULL);
 117 }
 118
 119 static void __noreturn pnv_power_off(void)
 120 {
 121         long rc = OPAL_BUSY;
 122
 123         opal_notifier_disable();
 124
 125         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 126                 rc = opal_cec_power_down(0);
 127                 if (rc == OPAL_BUSY_EVENT)
 128                         opal_poll_events(NULL);
 129                 else
 130                         mdelay(10);
 131         }
 132         for (;;)
 133                 opal_poll_events(NULL);
 134 }
 135
 136 static void __noreturn pnv_halt(void)
 137 {
 138         pnv_power_off();
 139 }
 140
 141 static void pnv_progress(char *s, unsigned short hex)
 142 {
 143 }
 144
 145 static int pnv_dma_set_mask(struct device *dev, u64 dma_mask)
 146 {
 147         if (dev_is_pci(dev))
 148                 return pnv_pci_dma_set_mask(to_pci_dev(dev), dma_mask);
 149         return __dma_set_mask(dev, dma_mask);
 150 }
 151
 152 static void pnv_shutdown(void)
 153 {
 154         /* Let the PCI code clear up IODA tables */
 155         pnv_pci_shutdown();
 156
 157         /*
 158          * Stop OPAL activity: Unregister all OPAL interrupts so they
 159          * don't fire up while we kexec and make sure all potentially
 160          * DMA'ing ops are complete (such as dump retrieval).
 161          */
 162         opal_shutdown();
 163 }
 164
 165 #ifdef CONFIG_KEXEC
 166 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 167 {
 168         xics_kexec_teardown_cpu(secondary);
 169
 170         /* Return secondary CPUs to firmware on OPAL v3 */
 171         if (firmware_has_feature(FW_FEATURE_OPALv3) && secondary) {
 172                 mb();
 173                 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
 174                 mb();
 175
 176                 /* Return the CPU to OPAL */
 177                 opal_return_cpu();
 178         }
 179 }
 180 #endif /* CONFIG_KEXEC */
 181
 182 static void __init pnv_setup_machdep_opal(void)
 183 {
 184         ppc_md.get_boot_time = opal_get_boot_time;
 185         ppc_md.get_rtc_time = opal_get_rtc_time;
 186         ppc_md.set_rtc_time = opal_set_rtc_time;
 187         ppc_md.restart = pnv_restart;
 188         ppc_md.power_off = pnv_power_off;
 189         ppc_md.halt = pnv_halt;
 190         ppc_md.machine_check_exception = opal_machine_check;
 191 }
 192
 193 #ifdef CONFIG_PPC_POWERNV_RTAS
 194 static void __init pnv_setup_machdep_rtas(void)
 195 {
 196         if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
 197                 ppc_md.get_boot_time = rtas_get_boot_time;
 198                 ppc_md.get_rtc_time = rtas_get_rtc_time;
 199                 ppc_md.set_rtc_time = rtas_set_rtc_time;
 200         }
 201         ppc_md.restart = rtas_restart;
 202         ppc_md.power_off = rtas_power_off;
 203         ppc_md.halt = rtas_halt;
 204 }
 205 #endif /* CONFIG_PPC_POWERNV_RTAS */
 206
 207 static int __init pnv_probe(void)
 208 {
 209         unsigned long root = of_get_flat_dt_root();
 210
 211         if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
 212                 return 0;
 213
 214         hpte_init_native();
 215
 216         if (firmware_has_feature(FW_FEATURE_OPAL))
 217                 pnv_setup_machdep_opal();
 218 #ifdef CONFIG_PPC_POWERNV_RTAS
 219         else if (rtas.base)
 220                 pnv_setup_machdep_rtas();
 221 #endif /* CONFIG_PPC_POWERNV_RTAS */
 222
 223         pr_debug("PowerNV detected !\n");
 224
 225         return 1;
 226 }
 227
 228 void powernv_idle(void)
 229 {
 230         /* Hook to cpuidle framework if available, else
 231          * call on default platform idle code
 232          */
 233         if (cpuidle_idle_call()) {
 234                 power7_idle();
 235         }
 236 }
 237
 238 define_machine(powernv) {
 239         .name                   = "PowerNV",
 240         .probe                  = pnv_probe,
 241         .init_early             = pnv_init_early,
 242         .setup_arch             = pnv_setup_arch,
 243         .init_IRQ               = pnv_init_IRQ,
 244         .show_cpuinfo           = pnv_show_cpuinfo,
 245         .progress               = pnv_progress,
 246         .machine_shutdown       = pnv_shutdown,
 247         .power_save             = powernv_idle,
 248         .calibrate_decr         = generic_calibrate_decr,
 249         .dma_set_mask           = pnv_dma_set_mask,
 250 #ifdef CONFIG_KEXEC
 251         .kexec_cpu_down         = pnv_kexec_cpu_down,
 252 #endif
 253 };