cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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irq-s3c24xx-fiq.S (2786B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      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
      8*/
      9
     10#include <linux/linkage.h>
     11#include <asm/assembler.h>
     12
     13#include "map.h"
     14#include "regs-irq.h"
     15
     16#include <linux/spi/s3c24xx-fiq.h>
     17
     18#define S3C2410_SPTDAT           (0x10)
     19#define S3C2410_SPRDAT           (0x14)
     20
     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
     37ENTRY(s3c24xx_spi_fiq_rx)
     38	.word	fiq_rx_end - fiq_rx_start
     39	.word	fiq_rx_irq_ack - fiq_rx_start
     40fiq_rx_start:
     41	ldr	fiq_rtmp, fiq_rx_irq_ack
     42	str	fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
     43
     44	ldrb	fiq_rtmp, [ fiq_rspi, #  S3C2410_SPRDAT ]
     45	strb	fiq_rtmp, [ fiq_rrx ], #1
     46
     47	mov	fiq_rtmp, #0xff
     48	strb	fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
     49
     50	subs	fiq_rcount, fiq_rcount, #1
     51	subsne	pc, lr, #4		@@ return, still have work to do
     52
     53	@@ set IRQ controller so that next op will trigger IRQ
     54	mov	fiq_rtmp, #0
     55	str	fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD  - S3C24XX_VA_IRQ ]
     56	subs	pc, lr, #4
     57
     58fiq_rx_irq_ack:
     59	.word	0
     60fiq_rx_end:
     61
     62ENTRY(s3c24xx_spi_fiq_txrx)
     63	.word	fiq_txrx_end - fiq_txrx_start
     64	.word	fiq_txrx_irq_ack - fiq_txrx_start
     65fiq_txrx_start:
     66
     67	ldrb	fiq_rtmp, [ fiq_rspi, #  S3C2410_SPRDAT ]
     68	strb	fiq_rtmp, [ fiq_rrx ], #1
     69
     70	ldr	fiq_rtmp, fiq_txrx_irq_ack
     71	str	fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
     72
     73	ldrb	fiq_rtmp, [ fiq_rtx ], #1
     74	strb	fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
     75
     76	subs	fiq_rcount, fiq_rcount, #1
     77	subsne	pc, lr, #4		@@ return, still have work to do
     78
     79	mov	fiq_rtmp, #0
     80	str	fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD  - S3C24XX_VA_IRQ ]
     81	subs	pc, lr, #4
     82
     83fiq_txrx_irq_ack:
     84	.word	0
     85
     86fiq_txrx_end:
     87
     88ENTRY(s3c24xx_spi_fiq_tx)
     89	.word	fiq_tx_end - fiq_tx_start
     90	.word	fiq_tx_irq_ack - fiq_tx_start
     91fiq_tx_start:
     92	ldrb	fiq_rtmp, [ fiq_rspi, #  S3C2410_SPRDAT ]
     93
     94	ldr	fiq_rtmp, fiq_tx_irq_ack
     95	str	fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
     96
     97	ldrb	fiq_rtmp, [ fiq_rtx ], #1
     98	strb	fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
     99
    100	subs	fiq_rcount, fiq_rcount, #1
    101	subsne	pc, lr, #4		@@ return, still have work to do
    102
    103	mov	fiq_rtmp, #0
    104	str	fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD  - S3C24XX_VA_IRQ ]
    105	subs	pc, lr, #4
    106
    107fiq_tx_irq_ack:
    108	.word	0
    109
    110fiq_tx_end:
    111
    112	.end