d8a00916b3
Add the UART definitions needed to support earlyprintk for MesonX SoCs on UARTAO. Signed-off-by: Carlo Caione <carlo@caione.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
35 lines
878 B
ArmAsm
35 lines
878 B
ArmAsm
/*
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* Copyright (C) 2014 Carlo Caione
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* Carlo Caione <carlo@caione.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define MESON_AO_UART_WFIFO 0x0
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#define MESON_AO_UART_STATUS 0xc
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#define MESON_AO_UART_TX_FIFO_EMPTY (1 << 22)
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#define MESON_AO_UART_TX_FIFO_FULL (1 << 21)
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.macro addruart, rp, rv, tmp
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ldr \rp, =(CONFIG_DEBUG_UART_PHYS) @ physical
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ldr \rv, =(CONFIG_DEBUG_UART_VIRT) @ virtual
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.endm
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.macro senduart,rd,rx
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str \rd, [\rx, #MESON_AO_UART_WFIFO]
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.endm
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.macro busyuart,rd,rx
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1002: ldr \rd, [\rx, #MESON_AO_UART_STATUS]
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tst \rd, #MESON_AO_UART_TX_FIFO_EMPTY
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beq 1002b
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.endm
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.macro waituart,rd,rx
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1001: ldr \rd, [\rx, #MESON_AO_UART_STATUS]
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tst \rd, #MESON_AO_UART_TX_FIFO_FULL
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bne 1001b
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.endm
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