494e492dd8
This implements output of debug messages on efm32 SoCs. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
45 lines
1 KiB
ArmAsm
45 lines
1 KiB
ArmAsm
/*
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* Copyright (C) 2013 Pengutronix
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* Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
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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 UARTn_CMD 0x000c
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#define UARTn_CMD_TXEN 0x0004
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#define UARTn_STATUS 0x0010
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#define UARTn_STATUS_TXC 0x0020
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#define UARTn_STATUS_TXBL 0x0040
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#define UARTn_TXDATA 0x0034
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.macro addruart, rx, tmp
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ldr \rx, =(CONFIG_DEBUG_UART_PHYS)
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/*
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* enable TX. The driver might disable it to save energy. We
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* don't care about disabling at the end as during debug power
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* consumption isn't that important.
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*/
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ldr \tmp, =(UARTn_CMD_TXEN)
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str \tmp, [\rx, #UARTn_CMD]
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.endm
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.macro senduart,rd,rx
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strb \rd, [\rx, #UARTn_TXDATA]
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.endm
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.macro waituart,rd,rx
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1001: ldr \rd, [\rx, #UARTn_STATUS]
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tst \rd, #UARTn_STATUS_TXBL
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beq 1001b
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.endm
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.macro busyuart,rd,rx
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1001: ldr \rd, [\rx, UARTn_STATUS]
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tst \rd, #UARTn_STATUS_TXC
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bne 1001b
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.endm
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