| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* arch/arm/mach-imx/include/mach/debug-macro.S |
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| 3 | * |
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| 4 | * Debugging macro include header |
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| 5 | * |
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| 6 | * Copyright (C) 1994-1999 Russell King |
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| 7 | * Moved from linux/arch/arm/kernel/debug.S by Ben Dooks |
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| 8 | */ |
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| 9 | |
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| 10 | #include <asm/assembler.h> |
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| 11 | #include "imx-uart.h" |
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| 12 | |
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| 13 | /* |
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| 14 | * FIXME: This is a copy of IMX_IO_P2V in hardware.h, and needs to |
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| 15 | * stay sync with that. It's hard to maintain, and should be fixed |
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| 16 | * globally for multi-platform build to use a fixed virtual address |
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| 17 | * for low-level debug uart port across platforms. |
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| 18 | */ |
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| 19 | #define IMX_IO_P2V(x) ( \ |
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| 20 | (((x) & 0x80000000) >> 7) | \ |
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| 21 | (0xf4000000 + \ |
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| 22 | (((x) & 0x50000000) >> 6) + \ |
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| 23 | (((x) & 0x0b000000) >> 4) + \ |
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| 24 | (((x) & 0x000fffff)))) |
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| 25 | |
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| 26 | #define UART_VADDR IMX_IO_P2V(UART_PADDR) |
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| 27 | |
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| 28 | .macro addruart, rp, rv, tmp |
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| 29 | ldr \rp, =UART_PADDR @ physical |
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| 30 | ldr \rv, =UART_VADDR @ virtual |
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| 31 | .endm |
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| 32 | |
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| 33 | .macro senduart,rd,rx |
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| 34 | ARM_BE8(rev \rd, \rd) |
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| 35 | str \rd, [\rx, #0x40] @ TXDATA |
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| 36 | .endm |
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| 37 | |
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| 38 | .macro waituartcts,rd,rx |
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| 39 | .endm |
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| 40 | |
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| 41 | .macro waituarttxrdy,rd,rx |
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| 42 | .endm |
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| 43 | |
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| 44 | .macro busyuart,rd,rx |
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| 45 | 1002: ldr \rd, [\rx, #0x98] @ SR2 |
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| 46 | ARM_BE8(rev \rd, \rd) |
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| 47 | tst \rd, #1 << 3 @ TXDC |
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| 48 | beq 1002b @ wait until transmit done |
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| 49 | .endm |
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| 50 | |
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