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Linux/arch/sparc/kernel/auxio_32.c

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  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 }
137 

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