/* auxio.c: Probing for the Sparc AUXIO register at boot time. * * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) */ #include <linux/stddef.h> #include <linux/init.h> #include <linux/config.h> #include <linux/spinlock.h> #include <asm/oplib.h> #include <asm/io.h> #include <asm/auxio.h> #include <asm/string.h> /* memset(), Linux has no bzero() */ /* Probe and map in the Auxiliary I/O register */ /* auxio_register is not static because it is referenced * in entry.S::floppy_tdone */ void __iomem *auxio_register = NULL; static DEFINE_SPINLOCK(auxio_lock); void __init auxio_probe(void) { int node, auxio_nd; struct linux_prom_registers auxregs[1]; struct resource r; switch (sparc_cpu_model) { case sun4d: case sun4: return; default: break; } node = prom_getchild(prom_root_node); auxio_nd = prom_searchsiblings(node, "auxiliary-io"); if(!auxio_nd) { node = prom_searchsiblings(node, "obio"); node = prom_getchild(node); auxio_nd = prom_searchsiblings(node, "auxio"); if(!auxio_nd) { #ifdef CONFIG_PCI /* There may be auxio on Ebus */ return; #else if(prom_searchsiblings(node, "leds")) { /* VME chassis sun4m machine, no auxio exists. */ return; } prom_printf("Cannot find auxio node, cannot continue...\n"); prom_halt(); #endif } } if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0) return; prom_apply_obio_ranges(auxregs, 0x1); /* Map the register both read and write */ r.flags = auxregs[0].which_io & 0xF; r.start = auxregs[0].phys_addr; r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1; auxio_register = sbus_ioremap(&r, 0, auxregs[0].reg_size, "auxio"); /* Fix the address on sun4m and sun4c. */ if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 || sparc_cpu_model == sun4c) auxio_register += (3 - ((unsigned long)auxio_register & 3)); set_auxio(AUXIO_LED, 0); } unsigned char get_auxio(void) { if(auxio_register) return sbus_readb(auxio_register); return 0; } void set_auxio(unsigned char bits_on, unsigned char bits_off) { unsigned char regval; unsigned long flags; spin_lock_irqsave(&auxio_lock, flags); switch(sparc_cpu_model) { case sun4c: regval = sbus_readb(auxio_register); sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN, auxio_register); break; case sun4m: if(!auxio_register) break; /* VME chassic sun4m, no auxio. */ regval = sbus_readb(auxio_register); sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M, auxio_register); break; case sun4d: break; default: panic("Can't set AUXIO register on this machine."); }; spin_unlock_irqrestore(&auxio_lock, flags); } /* sun4m power control register (AUXIO2) */ volatile unsigned char * auxio_power_register = NULL; void __init auxio_power_probe(void) { struct linux_prom_registers regs; int node; struct resource r; /* Attempt to find the sun4m power control node. */ node = prom_getchild(prom_root_node); node = prom_searchsiblings(node, "obio"); node = prom_getchild(node); node = prom_searchsiblings(node, "power"); if (node == 0 || node == -1) return; /* Map the power control register. */ if (prom_getproperty(node, "reg", (char *)®s, sizeof(regs)) <= 0) return; prom_apply_obio_ranges(®s, 1); memset(&r, 0, sizeof(r)); r.flags = regs.which_io & 0xF; r.start = regs.phys_addr; r.end = regs.phys_addr + regs.reg_size - 1; auxio_power_register = (unsigned char *) sbus_ioremap(&r, 0, regs.reg_size, "auxpower"); /* Display a quick message on the console. */ if (auxio_power_register) printk(KERN_INFO "Power off control detected.\n"); }