From b4ad44baab713af371b1113dd63dd222ba73ba13 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Tue, 6 Jan 2015 14:28:16 +0900 Subject: ARM: UniPhier: add UART initialization routine for low-level debug 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 --- .../cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S (limited to 'arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S') diff --git a/arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S b/arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S new file mode 100644 index 0000000..c0778a0 --- /dev/null +++ b/arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S @@ -0,0 +1,29 @@ +/* + * On-chip UART initializaion for low-level debugging + * + * Copyright (C) 2014 Panasonic Corporation + * Author: Masahiro Yamada + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include + +#define UART_CLK 36864000 +#include + +ENTRY(setup_lowlevel_debug) + init_debug_uart r0, r1, r2 + + /* UART Port 0 */ + set_pinsel 85, 1, r0, r1 + set_pinsel 88, 1, r0, r1 + + ldr r0, =SG_IECTRL + ldr r1, [r0] + orr r1, r1, #1 + str r1, [r0] + + mov pc, lr +ENDPROC(setup_lowlevel_debug) -- cgit v1.1