^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* linux/drivers/spi/spi_s3c24xx_fiq.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright 2009 Simtec Electronics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Ben Dooks <ben@simtec.co.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * S3C24XX SPI - FIQ pseudo-DMA transfer code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/assembler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "map.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "regs-irq.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/spi/s3c24xx-fiq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define S3C2410_SPTDAT (0x10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define S3C2410_SPRDAT (0x14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) .text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) @ entry to these routines is as follows, with the register names
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) @ defined in fiq.h so that they can be shared with the C files which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) @ setup the calling registers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) @
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) @ fiq_rirq The base of the IRQ registers to find S3C2410_SRCPND
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) @ fiq_rtmp Temporary register to hold tx/rx data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) @ fiq_rspi The base of the SPI register block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) @ fiq_rtx The tx buffer pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) @ fiq_rrx The rx buffer pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) @ fiq_rcount The number of bytes to move
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) @ each entry starts with a word entry of how long it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) @ and an offset to the irq acknowledgment word
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) ENTRY(s3c24xx_spi_fiq_rx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) .word fiq_rx_end - fiq_rx_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) .word fiq_rx_irq_ack - fiq_rx_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) fiq_rx_start:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) ldr fiq_rtmp, fiq_rx_irq_ack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) str fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) ldrb fiq_rtmp, [ fiq_rspi, # S3C2410_SPRDAT ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) strb fiq_rtmp, [ fiq_rrx ], #1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) mov fiq_rtmp, #0xff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) strb fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) subs fiq_rcount, fiq_rcount, #1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) subsne pc, lr, #4 @@ return, still have work to do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) @@ set IRQ controller so that next op will trigger IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) mov fiq_rtmp, #0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) str fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD - S3C24XX_VA_IRQ ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) subs pc, lr, #4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) fiq_rx_irq_ack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) .word 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) fiq_rx_end:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ENTRY(s3c24xx_spi_fiq_txrx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .word fiq_txrx_end - fiq_txrx_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .word fiq_txrx_irq_ack - fiq_txrx_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) fiq_txrx_start:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) ldrb fiq_rtmp, [ fiq_rspi, # S3C2410_SPRDAT ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) strb fiq_rtmp, [ fiq_rrx ], #1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ldr fiq_rtmp, fiq_txrx_irq_ack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) str fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) ldrb fiq_rtmp, [ fiq_rtx ], #1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) strb fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) subs fiq_rcount, fiq_rcount, #1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) subsne pc, lr, #4 @@ return, still have work to do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) mov fiq_rtmp, #0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) str fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD - S3C24XX_VA_IRQ ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) subs pc, lr, #4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) fiq_txrx_irq_ack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) .word 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) fiq_txrx_end:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) ENTRY(s3c24xx_spi_fiq_tx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .word fiq_tx_end - fiq_tx_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) .word fiq_tx_irq_ack - fiq_tx_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) fiq_tx_start:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) ldrb fiq_rtmp, [ fiq_rspi, # S3C2410_SPRDAT ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) ldr fiq_rtmp, fiq_tx_irq_ack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) str fiq_rtmp, [ fiq_rirq, # S3C2410_SRCPND - S3C24XX_VA_IRQ ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ldrb fiq_rtmp, [ fiq_rtx ], #1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) strb fiq_rtmp, [ fiq_rspi, # S3C2410_SPTDAT ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) subs fiq_rcount, fiq_rcount, #1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) subsne pc, lr, #4 @@ return, still have work to do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) mov fiq_rtmp, #0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) str fiq_rtmp, [ fiq_rirq, # S3C2410_INTMOD - S3C24XX_VA_IRQ ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) subs pc, lr, #4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) fiq_tx_irq_ack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .word 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) fiq_tx_end:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) .end
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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