From d5cf32977f0068c046687e3ff944c5e637b4bfa0 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Fri, 18 Mar 2016 16:41:52 +0900 Subject: ARM: uniphier: support Debug UART 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 --- arch/arm/mach-uniphier/debug-uart/debug-uart-sld8.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 arch/arm/mach-uniphier/debug-uart/debug-uart-sld8.c (limited to 'arch/arm/mach-uniphier/debug-uart/debug-uart-sld8.c') diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart-sld8.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-sld8.c new file mode 100644 index 0000000..68d390c --- /dev/null +++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-sld8.c @@ -0,0 +1,21 @@ +/* + * Copyright (C) 2016 Masahiro Yamada + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include + +#include "../sg-regs.h" +#include "debug-uart.h" + +#define UNIPHIER_SLD8_UART_CLK 80000000 + +unsigned int uniphier_sld8_debug_uart_init(void) +{ + sg_set_iectrl(0); + sg_set_pinsel(70, 3, 8, 4); /* HSDOUT6 -> TXD0 */ + + return DIV_ROUND_CLOSEST(UNIPHIER_SLD8_UART_CLK, 16 * CONFIG_BAUDRATE); +} -- cgit v1.1