101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/*
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* ofw.c - Open Firmware client interface for 32-bit systems.
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* This code is intended to be portable to any 32-bit Open Firmware
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* implementation with a standard client interface that can be
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* called when Linux is running.
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*
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* Copyright (C) 2007 Mitch Bradley <wmb@firmworks.com>
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* Copyright (C) 2007 Andres Salomon <dilinger@debian.org>
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*/
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#include <stdarg.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <asm/ofw.h>
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int (*call_firmware)(int *);
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static DEFINE_SPINLOCK(prom_lock);
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#define MAXARGS 20
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/*
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* The return value from ofw() in all cases is 0 if the attempt to call the
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* function succeeded, <0 otherwise. That return value is from the
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* gateway function only. Any results from the called function are returned
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* via output argument pointers.
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*
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* Here are call templates for all the standard OFW client services:
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*
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* ofw("test", 1, 1, namestr, &missing);
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* ofw("peer", 1, 1, phandle, &sibling_phandle);
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* ofw("child", 1, 1, phandle, &child_phandle);
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* ofw("parent", 1, 1, phandle, &parent_phandle);
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* ofw("instance_to_package", 1, 1, ihandle, &phandle);
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* ofw("getproplen", 2, 1, phandle, namestr, &proplen);
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* ofw("getprop", 4, 1, phandle, namestr, bufaddr, buflen, &size);
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* ofw("nextprop", 3, 1, phandle, previousstr, bufaddr, &flag);
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* ofw("setprop", 4, 1, phandle, namestr, bufaddr, len, &size);
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* ofw("canon", 3, 1, devspecstr, bufaddr, buflen, &length);
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* ofw("finddevice", 1, 1, devspecstr, &phandle);
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* ofw("instance-to-path", 3, 1, ihandle, bufaddr, buflen, &length);
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* ofw("package-to-path", 3, 1, phandle, bufaddr, buflen, &length);
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* ofw("call_method", numin, numout, in0, in1, ..., &out0, &out1, ...);
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* ofw("open", 1, 1, devspecstr, &ihandle);
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* ofw("close", 1, 0, ihandle);
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* ofw("read", 3, 1, ihandle, addr, len, &actual);
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* ofw("write", 3, 1, ihandle, addr, len, &actual);
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* ofw("seek", 3, 1, ihandle, pos_hi, pos_lo, &status);
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* ofw("claim", 3, 1, virtaddr, size, align, &baseaddr);
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* ofw("release", 2, 0, virtaddr, size);
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* ofw("boot", 1, 0, bootspecstr);
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* ofw("enter", 0, 0);
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* ofw("exit", 0, 0);
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* ofw("chain", 5, 0, virtaddr, size, entryaddr, argsaddr, len);
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* ofw("interpret", numin+1, numout+1, cmdstr, in0, ..., &catchres, &out0, ...);
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* ofw("set-callback", 1, 1, newfuncaddr, &oldfuncaddr);
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* ofw("set-symbol-lookup", 2, 0, symtovaladdr, valtosymaddr);
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* ofw("milliseconds", 0, 1, &ms);
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*/
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int ofw(char *name, int numargs, int numres, ...)
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{
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va_list ap;
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int argarray[MAXARGS+3];
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int argnum = 3;
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int retval;
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int *intp;
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unsigned long flags;
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if (!call_firmware)
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return -1;
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if ((numargs + numres) > MAXARGS)
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return -1; /* spit out an error? */
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argarray[0] = (int) name;
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argarray[1] = numargs;
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argarray[2] = numres;
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va_start(ap, numres);
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while (numargs) {
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argarray[argnum++] = va_arg(ap, int);
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numargs--;
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}
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spin_lock_irqsave(&prom_lock, flags);
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retval = call_firmware(argarray);
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spin_unlock_irqrestore(&prom_lock, flags);
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if (retval == 0) {
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while (numres) {
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intp = va_arg(ap, int *);
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*intp = argarray[argnum++];
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numres--;
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}
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}
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va_end(ap);
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return retval;
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}
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EXPORT_SYMBOL(ofw);
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