[mirror_ubuntu-jammy-kernel.git] / arch / arm / mach-s3c / irq-s3c24xx-fiq.S

/* 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 "map.h"
#include "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
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
bec0806c BD	2	/* linux/drivers/spi/spi_s3c24xx_fiq.S
	3	*
	4	* Copyright 2009 Simtec Electronics
	5	* Ben Dooks <ben@simtec.co.uk>
	6	*
	7	* S3C24XX SPI - FIQ pseudo-DMA transfer code
bec0806c BD	8	*/
	9
	10	#include <linux/linkage.h>
	11	#include <asm/assembler.h>
	12
c6ff132d AB	13	#include "map.h"
c6ff132d AB	14	#include "regs-irq.h"
bec0806c	15
f131a444	16	#include <linux/spi/s3c24xx-fiq.h>
bec0806c	17
0144e3fc AB	18	#define S3C2410_SPTDAT (0x10)
	19	#define S3C2410_SPRDAT (0x14)
	20
bec0806c BD	21	.text
	22
	23	@ entry to these routines is as follows, with the register names
	24	@ defined in fiq.h so that they can be shared with the C files which
	25	@ setup the calling registers.
	26	@
	27	@ fiq_rirq The base of the IRQ registers to find S3C2410_SRCPND
	28	@ fiq_rtmp Temporary register to hold tx/rx data
	29	@ fiq_rspi The base of the SPI register block
	30	@ fiq_rtx The tx buffer pointer
	31	@ fiq_rrx The rx buffer pointer
	32	@ fiq_rcount The number of bytes to move
	33
	34	@ each entry starts with a word entry of how long it is
	35	@ and an offset to the irq acknowledgment word
	36
	37	ENTRY(s3c24xx_spi_fiq_rx)
	38	s3c24xx_spi_fix_rx:
	39	.word fiq_rx_end - fiq_rx_start
	40	.word fiq_rx_irq_ack - fiq_rx_start
	41	fiq_rx_start:
	42	ldr fiq_rtmp, fiq_rx_irq_ack
	43	str fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
	44
	45	ldrb fiq_rtmp, [ fiq_rspi, # S3C2410_SPRDAT ]
	46	strb fiq_rtmp, [ fiq_rrx ], #1
	47
	48	mov fiq_rtmp, #0xff
	49	strb fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
	50
	51	subs fiq_rcount, fiq_rcount, #1
	52	subnes pc, lr, #4 @@ return, still have work to do
	53
	54	@@ set IRQ controller so that next op will trigger IRQ
	55	mov fiq_rtmp, #0
	56	str fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD - S3C24XX_VA_IRQ ]
	57	subs pc, lr, #4
	58
	59	fiq_rx_irq_ack:
	60	.word 0
	61	fiq_rx_end:
	62
	63	ENTRY(s3c24xx_spi_fiq_txrx)
	64	s3c24xx_spi_fiq_txrx:
	65	.word fiq_txrx_end - fiq_txrx_start
	66	.word fiq_txrx_irq_ack - fiq_txrx_start
	67	fiq_txrx_start:
	68
	69	ldrb fiq_rtmp, [ fiq_rspi, # S3C2410_SPRDAT ]
	70	strb fiq_rtmp, [ fiq_rrx ], #1
	71
	72	ldr fiq_rtmp, fiq_txrx_irq_ack
	73	str fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
	74
	75	ldrb fiq_rtmp, [ fiq_rtx ], #1
	76	strb fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
	77
	78	subs fiq_rcount, fiq_rcount, #1
	79	subnes pc, lr, #4 @@ return, still have work to do
	80
	81	mov fiq_rtmp, #0
	82	str fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD - S3C24XX_VA_IRQ ]
	83	subs pc, lr, #4
	84
85	fiq_txrx_irq_ack:
86	.word 0
87
88	fiq_txrx_end:
89
90	ENTRY(s3c24xx_spi_fiq_tx)
91	s3c24xx_spi_fix_tx:
92	.word fiq_tx_end - fiq_tx_start
93	.word fiq_tx_irq_ack - fiq_tx_start
94	fiq_tx_start:
95	ldrb fiq_rtmp, [ fiq_rspi, # S3C2410_SPRDAT ]
96
97	ldr fiq_rtmp, fiq_tx_irq_ack
98	str fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
99
100	ldrb fiq_rtmp, [ fiq_rtx ], #1
101	strb fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
102
103	subs fiq_rcount, fiq_rcount, #1
104	subnes pc, lr, #4 @@ return, still have work to do
105
106	mov fiq_rtmp, #0
107	str fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD - S3C24XX_VA_IRQ ]
108	subs pc, lr, #4
109
110	fiq_tx_irq_ack:
111	.word 0
112
113	fiq_tx_end:
114
115	.end