| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * arch/arm/include/debug/8250.S |
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| 4 | * |
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| 5 | * Copyright (C) 1994-2013 Russell King |
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| 6 | */ |
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| 7 | #include <linux/serial_reg.h> |
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| 8 | |
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| 9 | .macro addruart, rp, rv, tmp |
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| 10 | ldr \rp, =CONFIG_DEBUG_UART_PHYS |
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| 11 | ldr \rv, =CONFIG_DEBUG_UART_VIRT |
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| 12 | .endm |
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| 13 | |
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| 14 | #ifdef CONFIG_DEBUG_UART_8250_WORD |
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| 15 | .macro store, rd, rx:vararg |
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| 16 | ARM_BE8(rev \rd, \rd) |
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| 17 | str \rd, \rx |
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| 18 | ARM_BE8(rev \rd, \rd) |
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| 19 | .endm |
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| 20 | |
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| 21 | .macro load, rd, rx:vararg |
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| 22 | ldr \rd, \rx |
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| 23 | ARM_BE8(rev \rd, \rd) |
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| 24 | .endm |
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| 25 | #else |
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| 26 | .macro store, rd, rx:vararg |
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| 27 | strb \rd, \rx |
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| 28 | .endm |
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| 29 | |
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| 30 | .macro load, rd, rx:vararg |
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| 31 | ldrb \rd, \rx |
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| 32 | .endm |
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| 33 | #endif |
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| 34 | |
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| 35 | #define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT |
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| 36 | |
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| 37 | .macro senduart,rd,rx |
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| 38 | store \rd, [\rx, #UART_TX << UART_SHIFT] |
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| 39 | .endm |
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| 40 | |
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| 41 | .macro busyuart,rd,rx |
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| 42 | 1002: load \rd, [\rx, #UART_LSR << UART_SHIFT] |
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| 43 | and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE |
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| 44 | teq \rd, #UART_LSR_TEMT | UART_LSR_THRE |
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| 45 | bne 1002b |
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| 46 | .endm |
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| 47 | |
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| 48 | .macro waituarttxrdy,rd,rx |
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| 49 | .endm |
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| 50 | |
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| 51 | .macro waituartcts,rd,rx |
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| 52 | 1001: load \rd, [\rx, #UART_MSR << UART_SHIFT] |
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| 53 | tst \rd, #UART_MSR_CTS |
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| 54 | beq 1001b |
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| 55 | .endm |
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| 56 | |
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