diff options
| 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 | |
| parent | 2661dfd0046285e9007c1de126255bee11c0b8cd (diff) | |
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')
| -rw-r--r-- | arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S | 29 |
2 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile b/arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile index 8794629b2a..0752906121 100644 --- a/arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile +++ b/arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_DISPLAY_BOARDINFO) += board_info.o obj-$(if $(CONFIG_OF_CONTROL),,y) += platdevice.o obj-y += boot-mode.o +obj-$(CONFIG_DEBUG_LL) += lowlevel_debug.o obj-$(CONFIG_SOC_INIT) += bcu_init.o sbc_init.o sg_init.o pll_init.o \ clkrst_init.o obj-$(CONFIG_BOARD_POSTCLK_INIT) += pinctrl.o 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) |