arch/sparc/kernel/auxio.c

   1 /* auxio.c: Probing for the Sparc AUXIO register at boot time.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   4  */
   5
   6 #include <linux/stddef.h>
   7 #include <linux/init.h>
   8 #include <linux/spinlock.h>
   9 #include <asm/oplib.h>
  10 #include <asm/io.h>
  11 #include <asm/auxio.h>
  12 #include <asm/string.h>         /* memset(), Linux has no bzero() */
  13
  14 /* Probe and map in the Auxiliary I/O register */
  15
  16 /* auxio_register is not static because it is referenced
  17  * in entry.S::floppy_tdone
  18  */
  19 void __iomem *auxio_register = NULL;
  20 static DEFINE_SPINLOCK(auxio_lock);
  21
  22 void __init auxio_probe(void)
  23 {
  24         int node, auxio_nd;
  25         struct linux_prom_registers auxregs[1];
  26         struct resource r;
  27
  28         switch (sparc_cpu_model) {
  29         case sun4d:
  30         case sun4:
  31                 return;
  32         default:
  33                 break;
  34         }
  35         node = prom_getchild(prom_root_node);
  36         auxio_nd = prom_searchsiblings(node, "auxiliary-io");
  37         if(!auxio_nd) {
  38                 node = prom_searchsiblings(node, "obio");
  39                 node = prom_getchild(node);
  40                 auxio_nd = prom_searchsiblings(node, "auxio");
  41                 if(!auxio_nd) {
  42 #ifdef CONFIG_PCI
  43                         /* There may be auxio on Ebus */
  44                         return;
  45 #else
  46                         if(prom_searchsiblings(node, "leds")) {
  47                                 /* VME chassis sun4m machine, no auxio exists. */
  48                                 return;
  49                         }
  50                         prom_printf("Cannot find auxio node, cannot continue...\n");
  51                         prom_halt();
  52 #endif
  53                 }
  54         }
  55         if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
  56                 return;
  57         prom_apply_obio_ranges(auxregs, 0x1);
  58         /* Map the register both read and write */
  59         r.flags = auxregs[0].which_io & 0xF;
  60         r.start = auxregs[0].phys_addr;
  61         r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
  62         auxio_register = sbus_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
  63         /* Fix the address on sun4m and sun4c. */
  64         if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
  65            sparc_cpu_model == sun4c)
  66                 auxio_register += (3 - ((unsigned long)auxio_register & 3));
  67
  68         set_auxio(AUXIO_LED, 0);
  69 }
  70
  71 unsigned char get_auxio(void)
  72 {
  73         if(auxio_register)
  74                 return sbus_readb(auxio_register);
  75         return 0;
  76 }
  77
  78 void set_auxio(unsigned char bits_on, unsigned char bits_off)
  79 {
  80         unsigned char regval;
  81         unsigned long flags;
  82         spin_lock_irqsave(&auxio_lock, flags);
  83         switch(sparc_cpu_model) {
  84         case sun4c:
  85                 regval = sbus_readb(auxio_register);
  86                 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
  87                         auxio_register);
  88                 break;
  89         case sun4m:
  90                 if(!auxio_register)
  91                         break;     /* VME chassis sun4m, no auxio. */
  92                 regval = sbus_readb(auxio_register);
  93                 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
  94                         auxio_register);
  95                 break;
  96         case sun4d:
  97                 break;
  98         default:
  99                 panic("Can't set AUXIO register on this machine.");
 100         };
 101         spin_unlock_irqrestore(&auxio_lock, flags);
 102 }
 103
 104
 105 /* sun4m power control register (AUXIO2) */
 106
 107 volatile unsigned char * auxio_power_register = NULL;
 108
 109 void __init auxio_power_probe(void)
 110 {
 111         struct linux_prom_registers regs;
 112         int node;
 113         struct resource r;
 114
 115         /* Attempt to find the sun4m power control node. */
 116         node = prom_getchild(prom_root_node);
 117         node = prom_searchsiblings(node, "obio");
 118         node = prom_getchild(node);
 119         node = prom_searchsiblings(node, "power");
 120         if (node == 0 || node == -1)
 121                 return;
 122
 123         /* Map the power control register. */
 124         if (prom_getproperty(node, "reg", (char *)&regs, sizeof(regs)) <= 0)
 125                 return;
 126         prom_apply_obio_ranges(&regs, 1);
 127         memset(&r, 0, sizeof(r));
 128         r.flags = regs.which_io & 0xF;
 129         r.start = regs.phys_addr;
 130         r.end = regs.phys_addr + regs.reg_size - 1;
 131         auxio_power_register = (unsigned char *) sbus_ioremap(&r, 0,
 132             regs.reg_size, "auxpower");
 133
 134         /* Display a quick message on the console. */
 135         if (auxio_power_register)
 136                 printk(KERN_INFO "Power off control detected.\n");
 137 }