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https://github.com/brain-hackers/u-boot-brain
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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>
30 lines
575 B
ArmAsm
30 lines
575 B
ArmAsm
/*
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* On-chip UART initializaion for low-level debugging
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*
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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/linkage.h>
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#include <asm/arch/sg-regs.h>
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#define UART_CLK 80000000
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#include <asm/arch/debug-uart.S>
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ENTRY(setup_lowlevel_debug)
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init_debug_uart r0, r1, r2
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/* UART Port 0 */
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set_pinsel 70, 3, r0, r1
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set_pinsel 71, 3, r0, r1
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ldr r0, =SG_IECTRL
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ldr r1, [r0]
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orr r1, r1, #1
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str r1, [r0]
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mov pc, lr
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ENDPROC(setup_lowlevel_debug)
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