18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * p1275.c: Sun IEEE 1275 PROM low level interface routines 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 68c2ecf20Sopenharmony_ci */ 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ci#include <linux/kernel.h> 98c2ecf20Sopenharmony_ci#include <linux/sched.h> 108c2ecf20Sopenharmony_ci#include <linux/smp.h> 118c2ecf20Sopenharmony_ci#include <linux/string.h> 128c2ecf20Sopenharmony_ci#include <linux/spinlock.h> 138c2ecf20Sopenharmony_ci#include <linux/irqflags.h> 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ci#include <asm/openprom.h> 168c2ecf20Sopenharmony_ci#include <asm/oplib.h> 178c2ecf20Sopenharmony_ci#include <asm/spitfire.h> 188c2ecf20Sopenharmony_ci#include <asm/pstate.h> 198c2ecf20Sopenharmony_ci#include <asm/ldc.h> 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_cistruct { 228c2ecf20Sopenharmony_ci long prom_callback; /* 0x00 */ 238c2ecf20Sopenharmony_ci void (*prom_cif_handler)(long *); /* 0x08 */ 248c2ecf20Sopenharmony_ci} p1275buf; 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ciextern void prom_world(int); 278c2ecf20Sopenharmony_ci 288c2ecf20Sopenharmony_ciextern void prom_cif_direct(unsigned long *args); 298c2ecf20Sopenharmony_ciextern void prom_cif_callback(void); 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_ci/* 328c2ecf20Sopenharmony_ci * This provides SMP safety on the p1275buf. 338c2ecf20Sopenharmony_ci */ 348c2ecf20Sopenharmony_ciDEFINE_RAW_SPINLOCK(prom_entry_lock); 358c2ecf20Sopenharmony_ci 368c2ecf20Sopenharmony_civoid p1275_cmd_direct(unsigned long *args) 378c2ecf20Sopenharmony_ci{ 388c2ecf20Sopenharmony_ci unsigned long flags; 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_ci local_save_flags(flags); 418c2ecf20Sopenharmony_ci local_irq_restore((unsigned long)PIL_NMI); 428c2ecf20Sopenharmony_ci raw_spin_lock(&prom_entry_lock); 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ci prom_world(1); 458c2ecf20Sopenharmony_ci prom_cif_direct(args); 468c2ecf20Sopenharmony_ci prom_world(0); 478c2ecf20Sopenharmony_ci 488c2ecf20Sopenharmony_ci raw_spin_unlock(&prom_entry_lock); 498c2ecf20Sopenharmony_ci local_irq_restore(flags); 508c2ecf20Sopenharmony_ci} 518c2ecf20Sopenharmony_ci 528c2ecf20Sopenharmony_civoid prom_cif_init(void *cif_handler, void *cif_stack) 538c2ecf20Sopenharmony_ci{ 548c2ecf20Sopenharmony_ci p1275buf.prom_cif_handler = (void (*)(long *))cif_handler; 558c2ecf20Sopenharmony_ci} 56