136 lines
3.1 KiB
ArmAsm
136 lines
3.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* linux/drivers/acorn/scsi/acornscsi-io.S: Acorn SCSI card IO
|
|
*/
|
|
#include <linux/linkage.h>
|
|
|
|
#include <asm/assembler.h>
|
|
#include <mach/hardware.h>
|
|
|
|
#if defined(__APCS_32__)
|
|
#define LOADREGS(t,r,l...) ldm##t r, l
|
|
#elif defined(__APCS_26__)
|
|
#define LOADREGS(t,r,l...) ldm##t r, l##^
|
|
#endif
|
|
|
|
@ Purpose: transfer a block of data from the acorn scsi card to memory
|
|
@ Proto : void acornscsi_in(unsigned int addr_start, char *buffer, int length)
|
|
@ Returns: nothing
|
|
|
|
.align
|
|
ENTRY(__acornscsi_in)
|
|
stmfd sp!, {r4 - r7, lr}
|
|
bic r0, r0, #3
|
|
mov lr, #0xff
|
|
orr lr, lr, #0xff00
|
|
acornscsi_in16lp:
|
|
subs r2, r2, #16
|
|
bmi acornscsi_in8
|
|
ldmia r0!, {r3, r4, r5, r6}
|
|
and r3, r3, lr
|
|
orr r3, r3, r4, lsl #16
|
|
and r4, r5, lr
|
|
orr r4, r4, r6, lsl #16
|
|
ldmia r0!, {r5, r6, r7, ip}
|
|
and r5, r5, lr
|
|
orr r5, r5, r6, lsl #16
|
|
and r6, r7, lr
|
|
orr r6, r6, ip, lsl #16
|
|
stmia r1!, {r3 - r6}
|
|
bne acornscsi_in16lp
|
|
LOADREGS(fd, sp!, {r4 - r7, pc})
|
|
|
|
acornscsi_in8: adds r2, r2, #8
|
|
bmi acornscsi_in4
|
|
ldmia r0!, {r3, r4, r5, r6}
|
|
and r3, r3, lr
|
|
orr r3, r3, r4, lsl #16
|
|
and r4, r5, lr
|
|
orr r4, r4, r6, lsl #16
|
|
stmia r1!, {r3 - r4}
|
|
LOADREGS(eqfd, sp!, {r4 - r7, pc})
|
|
sub r2, r2, #8
|
|
|
|
acornscsi_in4: adds r2, r2, #4
|
|
bmi acornscsi_in2
|
|
ldmia r0!, {r3, r4}
|
|
and r3, r3, lr
|
|
orr r3, r3, r4, lsl #16
|
|
str r3, [r1], #4
|
|
LOADREGS(eqfd, sp!, {r4 - r7, pc})
|
|
sub r2, r2, #4
|
|
|
|
acornscsi_in2: adds r2, r2, #2
|
|
ldr r3, [r0], #4
|
|
and r3, r3, lr
|
|
strb r3, [r1], #1
|
|
mov r3, r3, lsr #8
|
|
strplb r3, [r1], #1
|
|
LOADREGS(fd, sp!, {r4 - r7, pc})
|
|
|
|
@ Purpose: transfer a block of data from memory to the acorn scsi card
|
|
@ Proto : void acornscsi_in(unsigned int addr_start, char *buffer, int length)
|
|
@ Returns: nothing
|
|
|
|
ENTRY(__acornscsi_out)
|
|
stmfd sp!, {r4 - r6, lr}
|
|
bic r0, r0, #3
|
|
acornscsi_out16lp:
|
|
subs r2, r2, #16
|
|
bmi acornscsi_out8
|
|
ldmia r1!, {r4, r6, ip, lr}
|
|
mov r3, r4, lsl #16
|
|
orr r3, r3, r3, lsr #16
|
|
mov r4, r4, lsr #16
|
|
orr r4, r4, r4, lsl #16
|
|
mov r5, r6, lsl #16
|
|
orr r5, r5, r5, lsr #16
|
|
mov r6, r6, lsr #16
|
|
orr r6, r6, r6, lsl #16
|
|
stmia r0!, {r3, r4, r5, r6}
|
|
mov r3, ip, lsl #16
|
|
orr r3, r3, r3, lsr #16
|
|
mov r4, ip, lsr #16
|
|
orr r4, r4, r4, lsl #16
|
|
mov ip, lr, lsl #16
|
|
orr ip, ip, ip, lsr #16
|
|
mov lr, lr, lsr #16
|
|
orr lr, lr, lr, lsl #16
|
|
stmia r0!, {r3, r4, ip, lr}
|
|
bne acornscsi_out16lp
|
|
LOADREGS(fd, sp!, {r4 - r6, pc})
|
|
|
|
acornscsi_out8: adds r2, r2, #8
|
|
bmi acornscsi_out4
|
|
ldmia r1!, {r4, r6}
|
|
mov r3, r4, lsl #16
|
|
orr r3, r3, r3, lsr #16
|
|
mov r4, r4, lsr #16
|
|
orr r4, r4, r4, lsl #16
|
|
mov r5, r6, lsl #16
|
|
orr r5, r5, r5, lsr #16
|
|
mov r6, r6, lsr #16
|
|
orr r6, r6, r6, lsl #16
|
|
stmia r0!, {r3, r4, r5, r6}
|
|
LOADREGS(eqfd, sp!, {r4 - r6, pc})
|
|
|
|
sub r2, r2, #8
|
|
acornscsi_out4: adds r2, r2, #4
|
|
bmi acornscsi_out2
|
|
ldr r4, [r1], #4
|
|
mov r3, r4, lsl #16
|
|
orr r3, r3, r3, lsr #16
|
|
mov r4, r4, lsr #16
|
|
orr r4, r4, r4, lsl #16
|
|
stmia r0!, {r3, r4}
|
|
LOADREGS(eqfd, sp!, {r4 - r6, pc})
|
|
|
|
sub r2, r2, #4
|
|
acornscsi_out2: adds r2, r2, #2
|
|
ldr r3, [r1], #2
|
|
strb r3, [r0], #1
|
|
mov r3, r3, lsr #8
|
|
strplb r3, [r0], #1
|
|
LOADREGS(fd, sp!, {r4 - r6, pc})
|
|
|