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/config.h>
   9 #include <linux/spinlock.h>
  10 #include <asm/oplib.h>
  11 #include <asm/io.h>
  12 #include <asm/auxio.h>
  13 #include <asm/string.h>         /* memset(), Linux has no bzero() */
  14
  15 /* Probe and map in the Auxiliary I/O register */
  16
  17 /* auxio_register is not static because it is referenced
  18  * in entry.S::floppy_tdone
  19  */
  20 void __iomem *auxio_register = NULL;
  21 static DEFINE_SPINLOCK(auxio_lock);
  22
  23 void __init auxio_probe(void)
  24 {
  25         int node, auxio_nd;
  26         struct linux_prom_registers auxregs[1];
  27         struct resource r;
  28
  29         switch (sparc_cpu_model) {
  30         case sun4d:
  31         case sun4:
  32                 return;
  33         default:
  34                 break;
  35         }
  36         node = prom_getchild(prom_root_node);
  37         auxio_nd = prom_searchsiblings(node, "auxiliary-io");
  38         if(!auxio_nd) {
  39                 node = prom_searchsiblings(node, "obio");
  40                 node = prom_getchild(node);
  41                 auxio_nd = prom_searchsiblings(node, "auxio");
  42                 if(!auxio_nd) {
  43 #ifdef CONFIG_PCI
  44                         /* There may be auxio on Ebus */
  45                         return;
  46 #else
  47                         if(prom_searchsiblings(node, "leds")) {
  48                                 /* VME chassis sun4m machine, no auxio exists. */
  49                                 return;
  50                         }
  51                         prom_printf("Cannot find auxio node, cannot continue...\n");
  52                         prom_halt();
  53 #endif
  54                 }
  55         }
  56         if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
  57                 return;
  58         prom_apply_obio_ranges(auxregs, 0x1);
  59         /* Map the register both read and write */
  60         r.flags = auxregs[0].which_io & 0xF;
  61         r.start = auxregs[0].phys_addr;
  62         r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
  63         auxio_register = sbus_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
  64         /* Fix the address on sun4m and sun4c. */
  65         if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
  66            sparc_cpu_model == sun4c)
  67                 auxio_register += (3 - ((unsigned long)auxio_register & 3));
  68
  69         set_auxio(AUXIO_LED, 0);
  70 }
  71
  72 unsigned char get_auxio(void)
  73 {
  74         if(auxio_register)
  75                 return sbus_readb(auxio_register);
  76         return 0;
  77 }
  78
  79 void set_auxio(unsigned char bits_on, unsigned char bits_off)
  80 {
  81         unsigned char regval;
  82         unsigned long flags;
  83         spin_lock_irqsave(&auxio_lock, flags);
  84         switch(sparc_cpu_model) {
  85         case sun4c:
  86                 regval = sbus_readb(auxio_register);
  87                 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
  88                         auxio_register);
  89                 break;
  90         case sun4m:
  91                 if(!auxio_register)
  92                         break;     /* VME chassic sun4m, no auxio. */
  93                 regval = sbus_readb(auxio_register);
  94                 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
  95                         auxio_register);
  96                 break;
  97         case sun4d:
  98                 break;
  99         default:
 100                 panic("Can't set AUXIO register on this machine.");
 101         };
 102         spin_unlock_irqrestore(&auxio_lock, flags);
 103 }
 104
 105
 106 /* sun4m power control register (AUXIO2) */
 107
 108 volatile unsigned char * auxio_power_register = NULL;
 109
 110 void __init auxio_power_probe(void)
 111 {
 112         struct linux_prom_registers regs;
 113         int node;
 114         struct resource r;
 115
 116         /* Attempt to find the sun4m power control node. */
 117         node = prom_getchild(prom_root_node);
 118         node = prom_searchsiblings(node, "obio");
 119         node = prom_getchild(node);
 120         node = prom_searchsiblings(node, "power");
 121         if (node == 0 || node == -1)
 122                 return;
 123
 124         /* Map the power control register. */
 125         if (prom_getproperty(node, "reg", (char *)&regs, sizeof(regs)) <= 0)
 126                 return;
 127         prom_apply_obio_ranges(&regs, 1);
 128         memset(&r, 0, sizeof(r));
 129         r.flags = regs.which_io & 0xF;
 130         r.start = regs.phys_addr;
 131         r.end = regs.phys_addr + regs.reg_size - 1;
 132         auxio_power_register = (unsigned char *) sbus_ioremap(&r, 0,
 133             regs.reg_size, "auxpower");
 134
 135         /* Display a quick message on the console. */
 136         if (auxio_power_register)
 137                 printk(KERN_INFO "Power off control detected.\n");
 138 }