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https://github.com/brain-hackers/u-boot-brain
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d5cf32977f
For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
32 lines
629 B
C
32 lines
629 B
C
/*
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* Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <config.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include "../bcu/bcu-regs.h"
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#include "../sc-regs.h"
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#include "../sg-regs.h"
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#include "debug-uart.h"
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#define UNIPHIER_SLD3_UART_CLK 36864000
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unsigned int uniphier_sld3_debug_uart_init(void)
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{
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u32 tmp;
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sg_set_pinsel(64, 1, 4, 4); /* TXD0 -> TXD0 */
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writel(0x24440000, BCSCR5);
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tmp = readl(SC_CLKCTRL);
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tmp |= SC_CLKCTRL_CEN_PERI;
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writel(tmp, SC_CLKCTRL);
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return DIV_ROUND_CLOSEST(UNIPHIER_SLD3_UART_CLK, 16 * CONFIG_BAUDRATE);
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}
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