mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
117 lines
2.9 KiB
ArmAsm
117 lines
2.9 KiB
ArmAsm
![]() |
/* linux/drivers/spi/spi_s3c24xx_fiq.S
|
||
|
*
|
||
|
* Copyright 2009 Simtec Electronics
|
||
|
* Ben Dooks <ben@simtec.co.uk>
|
||
|
*
|
||
|
* S3C24XX SPI - FIQ pseudo-DMA transfer code
|
||
|
*
|
||
|
* 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 <mach/map.h>
|
||
|
#include <mach/regs-irq.h>
|
||
|
#include <plat/regs-spi.h>
|
||
|
|
||
|
#include "spi_s3c24xx_fiq.h"
|
||
|
|
||
|
.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
|