arch/sparc64/kernel/power.c

   1 /* power.c: Power management driver.
   2  *
   3  * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/sched.h>
  10 #include <linux/signal.h>
  11 #include <linux/delay.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/pm.h>
  14 #include <linux/syscalls.h>
  15 #include <linux/reboot.h>
  16
  17 #include <asm/system.h>
  18 #include <asm/auxio.h>
  19 #include <asm/prom.h>
  20 #include <asm/of_device.h>
  21 #include <asm/io.h>
  22 #include <asm/sstate.h>
  23 <<<<<<< HEAD:arch/sparc64/kernel/power.c
  24 =======
  25 #include <asm/reboot.h>
  26 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/sparc64/kernel/power.c
  27
  28 #include <linux/unistd.h>
  29
  30 /*
  31  * sysctl - toggle power-off restriction for serial console
  32  * systems in machine_power_off()
  33  */
  34 int scons_pwroff = 1;
  35
  36 static void __iomem *power_reg;
  37
  38 static irqreturn_t power_handler(int irq, void *dev_id)
  39 {
  40         orderly_poweroff(true);
  41
  42         /* FIXME: Check registers for status... */
  43         return IRQ_HANDLED;
  44 }
  45
  46 <<<<<<< HEAD:arch/sparc64/kernel/power.c
  47 extern void machine_halt(void);
  48 extern void machine_alt_power_off(void);
  49 =======
  50 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/sparc64/kernel/power.c
  51 static void (*poweroff_method)(void) = machine_alt_power_off;
  52
  53 void machine_power_off(void)
  54 {
  55         sstate_poweroff();
  56         if (strcmp(of_console_device->type, "serial") || scons_pwroff) {
  57                 if (power_reg) {
  58                         /* Both register bits seem to have the
  59                          * same effect, so until I figure out
  60                          * what the difference is...
  61                          */
  62                         writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg);
  63                 } else {
  64                         if (poweroff_method != NULL) {
  65                                 poweroff_method();
  66                                 /* not reached */
  67                         }
  68                 }
  69         }
  70         machine_halt();
  71 }
  72
  73 void (*pm_power_off)(void) = machine_power_off;
  74 EXPORT_SYMBOL(pm_power_off);
  75
  76 static int __init has_button_interrupt(unsigned int irq, struct device_node *dp)
  77 {
  78         if (irq == 0xffffffff)
  79                 return 0;
  80         if (!of_find_property(dp, "button", NULL))
  81                 return 0;
  82
  83         return 1;
  84 }
  85
  86 static int __devinit power_probe(struct of_device *op, const struct of_device_id *match)
  87 {
  88         struct resource *res = &op->resource[0];
  89         unsigned int irq= op->irqs[0];
  90
  91         power_reg = of_ioremap(res, 0, 0x4, "power");
  92
  93         printk(KERN_INFO "%s: Control reg at %lx\n",
  94                op->node->name, res->start);
  95
  96         poweroff_method = machine_halt;  /* able to use the standard halt */
  97
  98         if (has_button_interrupt(irq, op->node)) {
  99                 if (request_irq(irq,
 100                                 power_handler, 0, "power", NULL) < 0)
 101                         printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
 102         }
 103
 104         return 0;
 105 }
 106
 107 static struct of_device_id power_match[] = {
 108         {
 109                 .name = "power",
 110         },
 111         {},
 112 };
 113
 114 static struct of_platform_driver power_driver = {
 115         .match_table    = power_match,
 116         .probe          = power_probe,
 117         .driver         = {
 118                 .name   = "power",
 119         },
 120 };
 121
 122 void __init power_init(void)
 123 {
 124         of_register_driver(&power_driver, &of_platform_bus_type);
 125         return;
 126 }