1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * p1275.c: Sun IEEE 1275 PROM low level interface routines 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #include <linux/kernel.h> 9*4882a593Smuzhiyun #include <linux/sched.h> 10*4882a593Smuzhiyun #include <linux/smp.h> 11*4882a593Smuzhiyun #include <linux/string.h> 12*4882a593Smuzhiyun #include <linux/spinlock.h> 13*4882a593Smuzhiyun #include <linux/irqflags.h> 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun #include <asm/openprom.h> 16*4882a593Smuzhiyun #include <asm/oplib.h> 17*4882a593Smuzhiyun #include <asm/spitfire.h> 18*4882a593Smuzhiyun #include <asm/pstate.h> 19*4882a593Smuzhiyun #include <asm/ldc.h> 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun struct { 22*4882a593Smuzhiyun long prom_callback; /* 0x00 */ 23*4882a593Smuzhiyun void (*prom_cif_handler)(long *); /* 0x08 */ 24*4882a593Smuzhiyun } p1275buf; 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun extern void prom_world(int); 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun extern void prom_cif_direct(unsigned long *args); 29*4882a593Smuzhiyun extern void prom_cif_callback(void); 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun /* 32*4882a593Smuzhiyun * This provides SMP safety on the p1275buf. 33*4882a593Smuzhiyun */ 34*4882a593Smuzhiyun DEFINE_RAW_SPINLOCK(prom_entry_lock); 35*4882a593Smuzhiyun p1275_cmd_direct(unsigned long * args)36*4882a593Smuzhiyunvoid p1275_cmd_direct(unsigned long *args) 37*4882a593Smuzhiyun { 38*4882a593Smuzhiyun unsigned long flags; 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun local_save_flags(flags); 41*4882a593Smuzhiyun local_irq_restore((unsigned long)PIL_NMI); 42*4882a593Smuzhiyun raw_spin_lock(&prom_entry_lock); 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun prom_world(1); 45*4882a593Smuzhiyun prom_cif_direct(args); 46*4882a593Smuzhiyun prom_world(0); 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun raw_spin_unlock(&prom_entry_lock); 49*4882a593Smuzhiyun local_irq_restore(flags); 50*4882a593Smuzhiyun } 51*4882a593Smuzhiyun prom_cif_init(void * cif_handler,void * cif_stack)52*4882a593Smuzhiyunvoid prom_cif_init(void *cif_handler, void *cif_stack) 53*4882a593Smuzhiyun { 54*4882a593Smuzhiyun p1275buf.prom_cif_handler = (void (*)(long *))cif_handler; 55*4882a593Smuzhiyun } 56