3 files changed, 126 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/Makefile b/arch/arm/mach-s3c24xx/Makefile
index 3ad297bd6b4a..b69eee24940b 100644
--- a/arch/arm/mach-s3c24xx/Makefile
+++ b/arch/arm/mach-s3c24xx/Makefile
@@ -9,6 +9,8 @@
 
 obj-y				+= common.o
 obj-y				+= irq-s3c24xx.o
+obj-$(CONFIG_SPI_S3C24XX_FIQ)	+= irq-s3c24xx-fiq.o
+obj-$(CONFIG_SPI_S3C24XX_FIQ)	+= irq-s3c24xx-fiq-exports.o
 
 obj-$(CONFIG_CPU_S3C2410)	+= s3c2410.o
 obj-$(CONFIG_S3C2410_PLL)	+= pll-s3c2410.o
diff --git a/arch/arm/mach-s3c24xx/irq-s3c24xx-fiq-exports.c b/arch/arm/mach-s3c24xx/irq-s3c24xx-fiq-exports.c
new file mode 100644
index 000000000000..84cf86376ded
--- /dev/null
+++ b/arch/arm/mach-s3c24xx/irq-s3c24xx-fiq-exports.c
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/stddef.h>
+#include <linux/export.h>
+#include <linux/spi/s3c24xx-fiq.h>
+
+EXPORT_SYMBOL(s3c24xx_spi_fiq_rx);
+EXPORT_SYMBOL(s3c24xx_spi_fiq_txrx);
+EXPORT_SYMBOL(s3c24xx_spi_fiq_tx);
diff --git a/arch/arm/mach-s3c24xx/irq-s3c24xx-fiq.S b/arch/arm/mach-s3c24xx/irq-s3c24xx-fiq.S
new file mode 100644
index 000000000000..2a84535a14fd
--- /dev/null
+++ b/arch/arm/mach-s3c24xx/irq-s3c24xx-fiq.S
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* linux/drivers/spi/spi_s3c24xx_fiq.S
+ *
+ * Copyright 2009 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C24XX SPI - FIQ pseudo-DMA transfer code
+*/
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+#include <mach/map.h>
+#include <mach/regs-irq.h>
+
+#include <linux/spi/s3c24xx-fiq.h>
+
+#define S3C2410_SPTDAT           (0x10)
+#define S3C2410_SPRDAT           (0x14)
+
+	.text
+
+	@ entry to these routines is as follows, with the register names
+	@ defined in fiq.h so that they can be shared with the C files which
+	@ setup the calling registers.
+	@
+	@ fiq_rirq	The base of the IRQ registers to find S3C2410_SRCPND
+	@ fiq_rtmp	Temporary register to hold tx/rx data
+	@ fiq_rspi	The base of the SPI register block
+	@ fiq_rtx	The tx buffer pointer
+	@ fiq_rrx	The rx buffer pointer
+	@ fiq_rcount	The number of bytes to move
+
+	@ each entry starts with a word entry of how long it is
+	@ and an offset to the irq acknowledgment word
+
+ENTRY(s3c24xx_spi_fiq_rx)
+s3c24xx_spi_fix_rx:
+	.word	fiq_rx_end - fiq_rx_start
+	.word	fiq_rx_irq_ack - fiq_rx_start
+fiq_rx_start:
+	ldr	fiq_rtmp, fiq_rx_irq_ack
+	str	fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
+
+	ldrb	fiq_rtmp, [ fiq_rspi, #  S3C2410_SPRDAT ]
+	strb	fiq_rtmp, [ fiq_rrx ], #1
+
+	mov	fiq_rtmp, #0xff
+	strb	fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
+
+	subs	fiq_rcount, fiq_rcount, #1
+	subnes	pc, lr, #4		@@ return, still have work to do
+
+	@@ set IRQ controller so that next op will trigger IRQ
+	mov	fiq_rtmp, #0
+	str	fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD  - S3C24XX_VA_IRQ ]
+	subs	pc, lr, #4
+
+fiq_rx_irq_ack:
+	.word	0
+fiq_rx_end:
+
+ENTRY(s3c24xx_spi_fiq_txrx)
+s3c24xx_spi_fiq_txrx:
+	.word	fiq_txrx_end - fiq_txrx_start
+	.word	fiq_txrx_irq_ack - fiq_txrx_start
+fiq_txrx_start:
+
+	ldrb	fiq_rtmp, [ fiq_rspi, #  S3C2410_SPRDAT ]
+	strb	fiq_rtmp, [ fiq_rrx ], #1
+
+	ldr	fiq_rtmp, fiq_txrx_irq_ack
+	str	fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
+
+	ldrb	fiq_rtmp, [ fiq_rtx ], #1
+	strb	fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
+
+	subs	fiq_rcount, fiq_rcount, #1
+	subnes	pc, lr, #4		@@ return, still have work to do
+
+	mov	fiq_rtmp, #0
+	str	fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD  - S3C24XX_VA_IRQ ]
+	subs	pc, lr, #4
+
+fiq_txrx_irq_ack:
+	.word	0
+
+fiq_txrx_end:
+
+ENTRY(s3c24xx_spi_fiq_tx)
+s3c24xx_spi_fix_tx:
+	.word	fiq_tx_end - fiq_tx_start
+	.word	fiq_tx_irq_ack - fiq_tx_start
+fiq_tx_start:
+	ldrb	fiq_rtmp, [ fiq_rspi, #  S3C2410_SPRDAT ]
+
+	ldr	fiq_rtmp, fiq_tx_irq_ack
+	str	fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
+
+	ldrb	fiq_rtmp, [ fiq_rtx ], #1
+	strb	fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
+
+	subs	fiq_rcount, fiq_rcount, #1
+	subnes	pc, lr, #4		@@ return, still have work to do
+
+	mov	fiq_rtmp, #0
+	str	fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD  - S3C24XX_VA_IRQ ]
+	subs	pc, lr, #4
+
+fiq_tx_irq_ack:
+	.word	0
+
+fiq_tx_end:
+
+	.end