mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-20 03:33:20 +09:00
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The low-level debugging functions are useful to debug the early boot stage where the full UART driver is not available. UniPhier SoCs need to initialize the UART port 0 to use this feature. The initialization routine is called at the very entry of the lowlevel_init(). Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
25 lines
554 B
ArmAsm
25 lines
554 B
ArmAsm
/*
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* Copyright (C) 2014 Panasonic Corporation
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* Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <linux/serial_reg.h>
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#if !defined(CONFIG_DEBUG_SEMIHOSTING)
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#include CONFIG_DEBUG_LL_INCLUDE
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#endif
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#define BAUDRATE 115200
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#define DIV_ROUND(x, d) (((x) + ((d) / 2)) / (d))
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#define DIVISOR DIV_ROUND(UART_CLK, 16 * BAUDRATE)
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.macro init_debug_uart, ra, rb, rc
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addruart \ra, \rb, \rc
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mov \rb, #UART_LCR_WLEN8
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strb \rb, [\ra, #0x11]
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ldr \rb, =DIVISOR
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str \rb, [\ra, #0x24]
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.endm
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