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/pci.h>
  30
  31 #include <asm/machdep.h>
  32 #include <asm/firmware.h>
  33 #include <asm/xics.h>
  34 #include <asm/rtas.h>
  35 #include <asm/opal.h>
  36 #include <asm/kexec.h>
  37
  38 #include "powernv.h"
  39
  40 static void __init pnv_setup_arch(void)
  41 {
  42         /* Initialize SMP */
  43         pnv_smp_init();
  44
  45         /* Setup PCI */
  46         pnv_pci_init();
  47
  48         /* Setup RTC and NVRAM callbacks */
  49         if (firmware_has_feature(FW_FEATURE_OPAL))
  50                 opal_nvram_init();
  51
  52         /* Enable NAP mode */
  53         powersave_nap = 1;
  54
  55         /* XXX PMCS */
  56 }
  57
  58 static void __init pnv_init_early(void)
  59 {
  60         /*
  61          * Initialize the LPC bus now so that legacy serial
  62          * ports can be found on it
  63          */
  64         opal_lpc_init();
  65
  66 #ifdef CONFIG_HVC_OPAL
  67         if (firmware_has_feature(FW_FEATURE_OPAL))
  68                 hvc_opal_init_early();
  69         else
  70 #endif
  71                 add_preferred_console("hvc", 0, NULL);
  72 }
  73
  74 static void __init pnv_init_IRQ(void)
  75 {
  76         xics_init();
  77
  78         WARN_ON(!ppc_md.get_irq);
  79 }
  80
  81 static void pnv_show_cpuinfo(struct seq_file *m)
  82 {
  83         struct device_node *root;
  84         const char *model = "";
  85
  86         root = of_find_node_by_path("/");
  87         if (root)
  88                 model = of_get_property(root, "model", NULL);
  89         seq_printf(m, "machine\t\t: PowerNV %s\n", model);
  90         if (firmware_has_feature(FW_FEATURE_OPALv3))
  91                 seq_printf(m, "firmware\t: OPAL v3\n");
  92         else if (firmware_has_feature(FW_FEATURE_OPALv2))
  93                 seq_printf(m, "firmware\t: OPAL v2\n");
  94         else if (firmware_has_feature(FW_FEATURE_OPAL))
  95                 seq_printf(m, "firmware\t: OPAL v1\n");
  96         else
  97                 seq_printf(m, "firmware\t: BML\n");
  98         of_node_put(root);
  99 }
 100
 101 static void  __noreturn pnv_restart(char *cmd)
 102 {
 103         long rc = OPAL_BUSY;
 104
 105         opal_notifier_disable();
 106
 107         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 108                 rc = opal_cec_reboot();
 109                 if (rc == OPAL_BUSY_EVENT)
 110                         opal_poll_events(NULL);
 111                 else
 112                         mdelay(10);
 113         }
 114         for (;;)
 115                 opal_poll_events(NULL);
 116 }
 117
 118 static void __noreturn pnv_power_off(void)
 119 {
 120         long rc = OPAL_BUSY;
 121
 122         opal_notifier_disable();
 123
 124         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 125                 rc = opal_cec_power_down(0);
 126                 if (rc == OPAL_BUSY_EVENT)
 127                         opal_poll_events(NULL);
 128                 else
 129                         mdelay(10);
 130         }
 131         for (;;)
 132                 opal_poll_events(NULL);
 133 }
 134
 135 static void __noreturn pnv_halt(void)
 136 {
 137         pnv_power_off();
 138 }
 139
 140 static void pnv_progress(char *s, unsigned short hex)
 141 {
 142 }
 143
 144 static int pnv_dma_set_mask(struct device *dev, u64 dma_mask)
 145 {
 146         if (dev_is_pci(dev))
 147                 return pnv_pci_dma_set_mask(to_pci_dev(dev), dma_mask);
 148         return __dma_set_mask(dev, dma_mask);
 149 }
 150
 151 static void pnv_shutdown(void)
 152 {
 153         /* Let the PCI code clear up IODA tables */
 154         pnv_pci_shutdown();
 155
 156         /*
 157          * Stop OPAL activity: Unregister all OPAL interrupts so they
 158          * don't fire up while we kexec and make sure all potentially
 159          * DMA'ing ops are complete (such as dump retrieval).
 160          */
 161         opal_shutdown();
 162 }
 163
 164 #ifdef CONFIG_KEXEC
 165 static void pnv_kexec_wait_secondaries_down(void)
 166 {
 167         int my_cpu, i, notified = -1;
 168
 169         my_cpu = get_cpu();
 170
 171         for_each_online_cpu(i) {
 172                 uint8_t status;
 173                 int64_t rc;
 174
 175                 if (i == my_cpu)
 176                         continue;
 177
 178                 for (;;) {
 179                         rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
 180                                                    &status);
 181                         if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
 182                                 break;
 183                         barrier();
 184                         if (i != notified) {
 185                                 printk(KERN_INFO "kexec: waiting for cpu %d "
 186                                        "(physical %d) to enter OPAL\n",
 187                                        i, paca[i].hw_cpu_id);
 188                                 notified = i;
 189                         }
 190                 }
 191         }
 192 }
 193
 194 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 195 {
 196         xics_kexec_teardown_cpu(secondary);
 197
 198         /* On OPAL v3, we return all CPUs to firmware */
 199
 200         if (!firmware_has_feature(FW_FEATURE_OPALv3))
 201                 return;
 202
 203         if (secondary) {
 204                 /* Return secondary CPUs to firmware on OPAL v3 */
 205                 mb();
 206                 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
 207                 mb();
 208
 209                 /* Return the CPU to OPAL */
 210                 opal_return_cpu();
 211         } else if (crash_shutdown) {
 212                 /*
 213                  * On crash, we don't wait for secondaries to go
 214                  * down as they might be unreachable or hung, so
 215                  * instead we just wait a bit and move on.
 216                  */
 217                 mdelay(1);
 218         } else {
 219                 /* Primary waits for the secondaries to have reached OPAL */
 220                 pnv_kexec_wait_secondaries_down();
 221         }
 222 }
 223 #endif /* CONFIG_KEXEC */
 224
 225 static void __init pnv_setup_machdep_opal(void)
 226 {
 227         ppc_md.get_boot_time = opal_get_boot_time;
 228         ppc_md.get_rtc_time = opal_get_rtc_time;
 229         ppc_md.set_rtc_time = opal_set_rtc_time;
 230         ppc_md.restart = pnv_restart;
 231         ppc_md.power_off = pnv_power_off;
 232         ppc_md.halt = pnv_halt;
 233         ppc_md.machine_check_exception = opal_machine_check;
 234         ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
 235 }
 236
 237 #ifdef CONFIG_PPC_POWERNV_RTAS
 238 static void __init pnv_setup_machdep_rtas(void)
 239 {
 240         if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
 241                 ppc_md.get_boot_time = rtas_get_boot_time;
 242                 ppc_md.get_rtc_time = rtas_get_rtc_time;
 243                 ppc_md.set_rtc_time = rtas_set_rtc_time;
 244         }
 245         ppc_md.restart = rtas_restart;
 246         ppc_md.power_off = rtas_power_off;
 247         ppc_md.halt = rtas_halt;
 248 }
 249 #endif /* CONFIG_PPC_POWERNV_RTAS */
 250
 251 static int __init pnv_probe(void)
 252 {
 253         unsigned long root = of_get_flat_dt_root();
 254
 255         if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
 256                 return 0;
 257
 258         hpte_init_native();
 259
 260         if (firmware_has_feature(FW_FEATURE_OPAL))
 261                 pnv_setup_machdep_opal();
 262 #ifdef CONFIG_PPC_POWERNV_RTAS
 263         else if (rtas.base)
 264                 pnv_setup_machdep_rtas();
 265 #endif /* CONFIG_PPC_POWERNV_RTAS */
 266
 267         pr_debug("PowerNV detected !\n");
 268
 269         return 1;
 270 }
 271
 272 define_machine(powernv) {
 273         .name                   = "PowerNV",
 274         .probe                  = pnv_probe,
 275         .init_early             = pnv_init_early,
 276         .setup_arch             = pnv_setup_arch,
 277         .init_IRQ               = pnv_init_IRQ,
 278         .show_cpuinfo           = pnv_show_cpuinfo,
 279         .progress               = pnv_progress,
 280         .machine_shutdown       = pnv_shutdown,
 281         .power_save             = power7_idle,
 282         .calibrate_decr         = generic_calibrate_decr,
 283         .dma_set_mask           = pnv_dma_set_mask,
 284 #ifdef CONFIG_KEXEC
 285         .kexec_cpu_down         = pnv_kexec_cpu_down,
 286 #endif
 287 };