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-rw-r--r--drivers/scsi/arm/acornscsi-io.S135
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})
+