Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * p1275.c: Sun IEEE 1275 PROM low level interface routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/irqflags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/openprom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/oplib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/spitfire.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/pstate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/ldc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	long prom_callback;			/* 0x00 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	void (*prom_cif_handler)(long *);	/* 0x08 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) } p1275buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) extern void prom_world(int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) extern void prom_cif_direct(unsigned long *args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) extern void prom_cif_callback(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  * This provides SMP safety on the p1275buf.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) DEFINE_RAW_SPINLOCK(prom_entry_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) void p1275_cmd_direct(unsigned long *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	local_save_flags(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	local_irq_restore((unsigned long)PIL_NMI);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	raw_spin_lock(&prom_entry_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	prom_world(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	prom_cif_direct(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	prom_world(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	raw_spin_unlock(&prom_entry_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) void prom_cif_init(void *cif_handler, void *cif_stack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }