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