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
  17 /* Probe and map in the Auxiliary I/O register */
  18
  19 /* auxio_register is not static because it is referenced
  20  * in entry.S::floppy_tdone
  21  */
  22 void __iomem *auxio_register = NULL;
  23 static DEFINE_SPINLOCK(auxio_lock);
  24
  25 void __init auxio_probe(void)
  26 {
  27         phandle node, auxio_nd;
  28         struct linux_prom_registers auxregs[1];
  29         struct resource r;
  30
  31         switch (sparc_cpu_model) {
  32         case sparc_leon:
  33         case sun4d:
  34         case sun4:
  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 and sun4c. */
  68         if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
  69            sparc_cpu_model == sun4c)
  70                 auxio_register += (3 - ((unsigned long)auxio_register & 3));
  71
  72         set_auxio(AUXIO_LED, 0);
  73 }
  74
  75 unsigned char get_auxio(void)
  76 {
  77         if(auxio_register)
  78                 return sbus_readb(auxio_register);
  79         return 0;
  80 }
  81 EXPORT_SYMBOL(get_auxio);
  82
  83 void set_auxio(unsigned char bits_on, unsigned char bits_off)
  84 {
  85         unsigned char regval;
  86         unsigned long flags;
  87         spin_lock_irqsave(&auxio_lock, flags);
  88         switch(sparc_cpu_model) {
  89         case sun4c:
  90                 regval = sbus_readb(auxio_register);
  91                 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
  92                         auxio_register);
  93                 break;
  94         case sun4m:
  95                 if(!auxio_register)
  96                         break;     /* VME chassis sun4m, no auxio. */
  97                 regval = sbus_readb(auxio_register);
  98                 sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
  99                         auxio_register);
 100                 break;
 101         case sun4d:
 102                 break;
 103         default:
 104                 panic("Can't set AUXIO register on this machine.");
 105         }
 106         spin_unlock_irqrestore(&auxio_lock, flags);
 107 }
 108 EXPORT_SYMBOL(set_auxio);
 109
 110 /* sun4m power control register (AUXIO2) */
 111
 112 volatile unsigned char * auxio_power_register = NULL;
 113
 114 void __init auxio_power_probe(void)
 115 {
 116         struct linux_prom_registers regs;
 117         phandle node;
 118         struct resource r;
 119
 120         /* Attempt to find the sun4m power control node. */
 121         node = prom_getchild(prom_root_node);
 122         node = prom_searchsiblings(node, "obio");
 123         node = prom_getchild(node);
 124         node = prom_searchsiblings(node, "power");
 125         if (node == 0 || (s32)node == -1)
 126                 return;
 127
 128         /* Map the power control register. */
 129         if (prom_getproperty(node, "reg", (char *)&regs, sizeof(regs)) <= 0)
 130                 return;
 131         prom_apply_obio_ranges(&regs, 1);
 132         memset(&r, 0, sizeof(r));
 133         r.flags = regs.which_io & 0xF;
 134         r.start = regs.phys_addr;
 135         r.end = regs.phys_addr + regs.reg_size - 1;
 136         auxio_power_register = (unsigned char *) of_ioremap(&r, 0,
 137             regs.reg_size, "auxpower");
 138
 139         /* Display a quick message on the console. */
 140         if (auxio_power_register)
 141                 printk(KERN_INFO "Power off control detected.\n");
 142 }