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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>
33 lines
737 B
C
33 lines
737 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 "../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_PXS2_UART_CLK 88888888
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unsigned int uniphier_pxs2_debug_uart_init(void)
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{
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u32 tmp;
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sg_set_iectrl(0);
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sg_set_pinsel(217, 8, 8, 4); /* TXD0 -> TXD0 */
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sg_set_pinsel(115, 8, 8, 4); /* TXD1 -> TXD1 */
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sg_set_pinsel(113, 8, 8, 4); /* TXD2 -> TXD2 */
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sg_set_pinsel(219, 8, 8, 4); /* TXD3 -> TXD3 */
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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_PXS2_UART_CLK, 16 * CONFIG_BAUDRATE);
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}
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