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| author | Masahiro Yamada <yamada.m@jp.panasonic.com> | 2015-01-06 14:28:16 +0900 |
|---|---|---|
| committer | Masahiro Yamada <yamada.m@jp.panasonic.com> | 2015-01-08 23:01:56 +0900 |
| commit | b4ad44baab713af371b1113dd63dd222ba73ba13 (patch) | |
| tree | c75beddbc007f8a1e6dc1bc1855fe37cea7afa55 /arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S | |
| parent | 2661dfd0046285e9007c1de126255bee11c0b8cd (diff) | |
| download | talos-obmc-uboot-b4ad44baab713af371b1113dd63dd222ba73ba13.tar.gz talos-obmc-uboot-b4ad44baab713af371b1113dd63dd222ba73ba13.zip | |
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 <yamada.m@jp.panasonic.com>
Diffstat (limited to 'arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S')
| -rw-r--r-- | arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S | 29 |
1 files changed, 29 insertions, 0 deletions
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 0000000000..c0778a0abb --- /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 <yamada.m@jp.panasonic.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <linux/linkage.h> +#include <asm/arch/sg-regs.h> + +#define UART_CLK 36864000 +#include <asm/arch/debug-uart.S> + +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) |
