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112 lines
2.7 KiB
112 lines
2.7 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* linux/drivers/spi/spi_s3c24xx_fiq.S |
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* |
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* Copyright 2009 Simtec Electronics |
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* Ben Dooks <ben@simtec.co.uk> |
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* |
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* S3C24XX SPI - FIQ pseudo-DMA transfer code |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/assembler.h> |
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#include "map.h" |
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#include "regs-irq.h" |
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#include <linux/spi/s3c24xx-fiq.h> |
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#define S3C2410_SPTDAT (0x10) |
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#define S3C2410_SPRDAT (0x14) |
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.text |
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@ entry to these routines is as follows, with the register names |
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@ defined in fiq.h so that they can be shared with the C files which |
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@ setup the calling registers. |
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@ |
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@ fiq_rirq The base of the IRQ registers to find S3C2410_SRCPND |
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@ fiq_rtmp Temporary register to hold tx/rx data |
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@ fiq_rspi The base of the SPI register block |
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@ fiq_rtx The tx buffer pointer |
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@ fiq_rrx The rx buffer pointer |
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@ fiq_rcount The number of bytes to move |
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@ each entry starts with a word entry of how long it is |
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@ and an offset to the irq acknowledgment word |
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ENTRY(s3c24xx_spi_fiq_rx) |
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.word fiq_rx_end - fiq_rx_start |
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.word fiq_rx_irq_ack - fiq_rx_start |
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fiq_rx_start: |
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ldr fiq_rtmp, fiq_rx_irq_ack |
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str fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ] |
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ldrb fiq_rtmp, [ fiq_rspi, # S3C2410_SPRDAT ] |
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strb fiq_rtmp, [ fiq_rrx ], #1 |
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mov fiq_rtmp, #0xff |
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strb fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ] |
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subs fiq_rcount, fiq_rcount, #1 |
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subsne pc, lr, #4 @@ return, still have work to do |
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@@ set IRQ controller so that next op will trigger IRQ |
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mov fiq_rtmp, #0 |
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str fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD - S3C24XX_VA_IRQ ] |
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subs pc, lr, #4 |
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fiq_rx_irq_ack: |
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.word 0 |
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fiq_rx_end: |
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ENTRY(s3c24xx_spi_fiq_txrx) |
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.word fiq_txrx_end - fiq_txrx_start |
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.word fiq_txrx_irq_ack - fiq_txrx_start |
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fiq_txrx_start: |
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ldrb fiq_rtmp, [ fiq_rspi, # S3C2410_SPRDAT ] |
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strb fiq_rtmp, [ fiq_rrx ], #1 |
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ldr fiq_rtmp, fiq_txrx_irq_ack |
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str fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ] |
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ldrb fiq_rtmp, [ fiq_rtx ], #1 |
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strb fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ] |
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subs fiq_rcount, fiq_rcount, #1 |
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subsne pc, lr, #4 @@ return, still have work to do |
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mov fiq_rtmp, #0 |
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str fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD - S3C24XX_VA_IRQ ] |
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subs pc, lr, #4 |
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fiq_txrx_irq_ack: |
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.word 0 |
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fiq_txrx_end: |
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ENTRY(s3c24xx_spi_fiq_tx) |
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.word fiq_tx_end - fiq_tx_start |
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.word fiq_tx_irq_ack - fiq_tx_start |
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fiq_tx_start: |
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ldrb fiq_rtmp, [ fiq_rspi, # S3C2410_SPRDAT ] |
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ldr fiq_rtmp, fiq_tx_irq_ack |
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str fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ] |
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ldrb fiq_rtmp, [ fiq_rtx ], #1 |
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strb fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ] |
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subs fiq_rcount, fiq_rcount, #1 |
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subsne pc, lr, #4 @@ return, still have work to do |
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mov fiq_rtmp, #0 |
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str fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD - S3C24XX_VA_IRQ ] |
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subs pc, lr, #4 |
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fiq_tx_irq_ack: |
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.word 0 |
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fiq_tx_end: |
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.end
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