arch/sparc/kernel/auxio_32.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 <linux/of.h>
  10 #include <linux/of_device.h>
  11 #include <asm/oplib.h>
  12 #include <asm/io.h>
  13 #include <asm/auxio.h>
  14 #include <asm/string.h>         /* memset(), Linux has no bzero() */
  15
  16 /* Probe and map in the Auxiliary I/O register */
  17
  18 /* auxio_register is not static because it is referenced
  19  * in entry.S::floppy_tdone
  20  */
  21 void __iomem *auxio_register = NULL;
  22 static DEFINE_SPINLOCK(auxio_lock);
  23
  24 void __init auxio_probe(void)
  25 {
  26         phandle node, auxio_nd;
  27         struct linux_prom_registers auxregs[1];
  28         struct resource r;
  29
  30         switch (sparc_cpu_model) {
  31         case sparc_leon:
  32         case sun4d:
  33         case sun4:
  34                 return;
  35         default:
  36                 break;
  37         }
  38         node = prom_getchild(prom_root_node);
  39         auxio_nd = prom_searchsiblings(node, "auxiliary-io");
  40         if(!auxio_nd) {
  41                 node = prom_searchsiblings(node, "obio");
  42                 node = prom_getchild(node);
  43                 auxio_nd = prom_searchsiblings(node, "auxio");
  44                 if(!auxio_nd) {
  45 #ifdef CONFIG_PCI
  46                         /* There may be auxio on Ebus */
  47                         return;
  48 #else
  49                         if(prom_searchsiblings(node, "leds")) {
  50                                 /* VME chassis sun4m machine, no auxio exists. */
  51                                 return;
  52                         }
  53                         prom_printf("Cannot find auxio node, cannot continue...\n");
  54                         prom_halt();
  55 #endif
  56                 }
  57         }
  58         if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
  59                 return;
  60         prom_apply_obio_ranges(auxregs, 0x1);
  61         /* Map the register both read and write */
  62         r.flags = auxregs[0].which_io & 0xF;
  63         r.start = auxregs[0].phys_addr;
  64         r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
  65         auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
  66         /* Fix the address on sun4m and sun4c. */
  67         if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
  68            sparc_cpu_model == sun4c)
  69                 auxio_register += (3 - ((unsigned long)auxio_register & 3));
  70
  71         set_auxio(AUXIO_LED, 0);
  72 }
  73
  74 unsigned char get_auxio(void)
  75 {
  76         if(auxio_register)
  77                 return sbus_readb(auxio_register);
  78         return 0;
  79 }
  80 EXPORT_SYMBOL(get_auxio);
  81
  82 void set_auxio(unsigned char bits_on, unsigned char bits_off)
  83 {
  84         unsigned char regval;
  85         unsigned long flags;
  86         spin_lock_irqsave(&auxio_lock, flags);
  87         switch(sparc_cpu_model) {
  88         case sun4c:
  89                 regval = sbus_readb(auxio_register);
  90                 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
  91                         auxio_register);
  92                 break;
  93         case sun4m:
  94                 if(!auxio_register)
  95                         break;     /* VME chassis sun4m, no auxio. */
  96                 regval = sbus_readb(auxio_register);
  97                 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
  98                         auxio_register);
  99                 break;
 100         case sun4d:
 101                 break;
 102         default:
 103                 panic("Can't set AUXIO register on this machine.");
 104         }
 105         spin_unlock_irqrestore(&auxio_lock, flags);
 106 }
 107 EXPORT_SYMBOL(set_auxio);
 108
 109 /* sun4m power control register (AUXIO2) */
 110
 111 volatile unsigned char * auxio_power_register = NULL;
 112
 113 void __init auxio_power_probe(void)
 114 {
 115         struct linux_prom_registers regs;
 116         phandle node;
 117         struct resource r;
 118
 119         /* Attempt to find the sun4m power control node. */
 120         node = prom_getchild(prom_root_node);
 121         node = prom_searchsiblings(node, "obio");
 122         node = prom_getchild(node);
 123         node = prom_searchsiblings(node, "power");
 124         if (node == 0 || (s32)node == -1)
 125                 return;
 126
 127         /* Map the power control register. */
 128         if (prom_getproperty(node, "reg", (char *)&regs, sizeof(regs)) <= 0)
 129                 return;
 130         prom_apply_obio_ranges(&regs, 1);
 131         memset(&r, 0, sizeof(r));
 132         r.flags = regs.which_io & 0xF;
 133         r.start = regs.phys_addr;
 134         r.end = regs.phys_addr + regs.reg_size - 1;
 135         auxio_power_register = (unsigned char *) of_ioremap(&r, 0,
 136             regs.reg_size, "auxpower");
 137
 138         /* Display a quick message on the console. */
 139         if (auxio_power_register)
 140                 printk(KERN_INFO "Power off control detected.\n");
 141 }