1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/scsi/arm/acornscsi-io.S b/drivers/scsi/arm/acornscsi-io.S
new file mode 100644
index 000000000..fdd7237bb
--- /dev/null
+++ b/drivers/scsi/arm/acornscsi-io.S
@@ -0,0 +1,135 @@
+/* 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})
+