Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * Setup the right wbflush routine for the different DECstations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Created with information from:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *	DECstation 3100 Desktop Workstation Functional Specification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *	DECstation 5000/200 KN02 System Module Functional Specification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *	mipsel-linux-objdump --disassemble vmunix | grep "wbflush" :-)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * License.  See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * Copyright (C) 1998 Harald Koerfgen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * Copyright (C) 2002 Maciej W. Rozycki
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/bootinfo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/wbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/barrier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static void wbflush_kn01(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static void wbflush_kn210(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static void wbflush_mips(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) void (*__wbflush) (void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) void __init wbflush_setup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	switch (mips_machtype) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	case MACH_DS23100:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	case MACH_DS5000_200:	/* DS5000 3max */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		__wbflush = wbflush_kn01;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	case MACH_DS5100:	/* DS5100 MIPSMATE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		__wbflush = wbflush_kn210;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	case MACH_DS5000_1XX:	/* DS5000/100 3min */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	case MACH_DS5000_XX:	/* Personal DS5000/2x */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	case MACH_DS5000_2X0:	/* DS5000/240 3max+ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	case MACH_DS5900:	/* DS5900 bigmax */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		__wbflush = wbflush_mips;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)  * For the DS3100 and DS5000/200 the R2020/R3220 writeback buffer functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)  * as part of Coprocessor 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static void wbflush_kn01(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)     asm(".set\tpush\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	".set\tnoreorder\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	"1:\tbc0f\t1b\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	"nop\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	".set\tpop");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)  * For the DS5100 the writeback buffer seems to be a part of Coprocessor 3.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)  * But CP3 has to enabled first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static void wbflush_kn210(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)     asm(".set\tpush\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	".set\tnoreorder\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	"mfc0\t$2,$12\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	"lui\t$3,0x8000\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	"or\t$3,$2,$3\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	"mtc0\t$3,$12\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	"nop\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	"1:\tbc3f\t1b\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	"nop\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	"mtc0\t$2,$12\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	"nop\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	".set\tpop"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	: : : "$2", "$3");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)  * I/O ASIC systems use a standard writeback buffer that gets flushed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)  * upon an uncached read.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static void wbflush_mips(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 	__fast_iob();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) EXPORT_SYMBOL(__wbflush);