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