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[linux-3.10.git] / drivers / spi / spi-s3c24xx-fiq.S
1 /* linux/drivers/spi/spi_s3c24xx_fiq.S
2  *
3  * Copyright 2009 Simtec Electronics
4  *      Ben Dooks <ben@simtec.co.uk>
5  *
6  * S3C24XX SPI - FIQ pseudo-DMA transfer code
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11 */
12
13 #include <linux/linkage.h>
14 #include <asm/assembler.h>
15
16 #include <mach/map.h>
17 #include <mach/regs-irq.h>
18 #include <plat/regs-spi.h>
19
20 #include "spi-s3c24xx-fiq.h"
21
22         .text
23
24         @ entry to these routines is as follows, with the register names
25         @ defined in fiq.h so that they can be shared with the C files which
26         @ setup the calling registers.
27         @
28         @ fiq_rirq      The base of the IRQ registers to find S3C2410_SRCPND
29         @ fiq_rtmp      Temporary register to hold tx/rx data
30         @ fiq_rspi      The base of the SPI register block
31         @ fiq_rtx       The tx buffer pointer
32         @ fiq_rrx       The rx buffer pointer
33         @ fiq_rcount    The number of bytes to move
34
35         @ each entry starts with a word entry of how long it is
36         @ and an offset to the irq acknowledgment word
37
38 ENTRY(s3c24xx_spi_fiq_rx)
39 s3c24xx_spi_fix_rx:
40         .word   fiq_rx_end - fiq_rx_start
41         .word   fiq_rx_irq_ack - fiq_rx_start
42 fiq_rx_start:
43         ldr     fiq_rtmp, fiq_rx_irq_ack
44         str     fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
45
46         ldrb    fiq_rtmp, [ fiq_rspi, #  S3C2410_SPRDAT ]
47         strb    fiq_rtmp, [ fiq_rrx ], #1
48
49         mov     fiq_rtmp, #0xff
50         strb    fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
51
52         subs    fiq_rcount, fiq_rcount, #1
53         subnes  pc, lr, #4              @@ return, still have work to do
54
55         @@ set IRQ controller so that next op will trigger IRQ
56         mov     fiq_rtmp, #0
57         str     fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD  - S3C24XX_VA_IRQ ]
58         subs    pc, lr, #4
59
60 fiq_rx_irq_ack:
61         .word   0
62 fiq_rx_end:
63
64 ENTRY(s3c24xx_spi_fiq_txrx)
65 s3c24xx_spi_fiq_txrx:
66         .word   fiq_txrx_end - fiq_txrx_start
67         .word   fiq_txrx_irq_ack - fiq_txrx_start
68 fiq_txrx_start:
69
70         ldrb    fiq_rtmp, [ fiq_rspi, #  S3C2410_SPRDAT ]
71         strb    fiq_rtmp, [ fiq_rrx ], #1
72
73         ldr     fiq_rtmp, fiq_txrx_irq_ack
74         str     fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
75
76         ldrb    fiq_rtmp, [ fiq_rtx ], #1
77         strb    fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
78
79         subs    fiq_rcount, fiq_rcount, #1
80         subnes  pc, lr, #4              @@ return, still have work to do
81
82         mov     fiq_rtmp, #0
83         str     fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD  - S3C24XX_VA_IRQ ]
84         subs    pc, lr, #4
85
86 fiq_txrx_irq_ack:
87         .word   0
88
89 fiq_txrx_end:
90
91 ENTRY(s3c24xx_spi_fiq_tx)
92 s3c24xx_spi_fix_tx:
93         .word   fiq_tx_end - fiq_tx_start
94         .word   fiq_tx_irq_ack - fiq_tx_start
95 fiq_tx_start:
96         ldrb    fiq_rtmp, [ fiq_rspi, #  S3C2410_SPRDAT ]
97
98         ldr     fiq_rtmp, fiq_tx_irq_ack
99         str     fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
100
101         ldrb    fiq_rtmp, [ fiq_rtx ], #1
102         strb    fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
103
104         subs    fiq_rcount, fiq_rcount, #1
105         subnes  pc, lr, #4              @@ return, still have work to do
106
107         mov     fiq_rtmp, #0
108         str     fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD  - S3C24XX_VA_IRQ ]
109         subs    pc, lr, #4
110
111 fiq_tx_irq_ack:
112         .word   0
113
114 fiq_tx_end:
115
116         .end