| /* |
| * linux/drivers/acorn/scsi/acornscsi-io.S: Acorn SCSI card IO |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/linkage.h> |
| |
| #include <asm/assembler.h> |
| #include <asm/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}) |
| |