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