u-boot/arch/arm/mach-uniphier/include/mach/debug-uart.S

/*
 * Copyright (C) 2014-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <linux/serial_reg.h>

#if !defined(CONFIG_DEBUG_SEMIHOSTING)
#include CONFIG_DEBUG_LL_INCLUDE
#endif

#define BAUDRATE		115200
#define DIV_ROUND(x, d)		(((x) + ((d) / 2)) / (d))
#define DIVISOR			DIV_ROUND(UART_CLK, 16 * BAUDRATE)

	.macro		init_debug_uart, ra, rb, rc
	addruart	\ra, \rb, \rc
	mov		\rb, #UART_LCR_WLEN8 << 8
	str		\rb, [\ra, #0x10]
	ldr		\rb, =DIVISOR
	str		\rb, [\ra, #0x24]
	.endm
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> 2015-01-06 05:28:16 +00:00			`/*`
ARM: UniPhier: use 32 bit register access for debug UART setting For the same reason as commit d0c47b3ef7c5 (serial: UniPhier: use 32 bit register access), use "str" instead of "strb" for the LCR register setting. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> 2015-05-29 08:30:02 +00:00			`* Copyright (C) 2014-2015 Masahiro Yamada <yamada.masahiro@socionext.com>`
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> 2015-01-06 05:28:16 +00:00			`*`
			`* SPDX-License-Identifier: GPL-2.0+`
			`*/`

			`#include <linux/serial_reg.h>`

			`#if !defined(CONFIG_DEBUG_SEMIHOSTING)`
			`#include CONFIG_DEBUG_LL_INCLUDE`
			`#endif`

			`#define BAUDRATE 115200`
			`#define DIV_ROUND(x, d) (((x) + ((d) / 2)) / (d))`
			`#define DIVISOR DIV_ROUND(UART_CLK, 16 * BAUDRATE)`

			`.macro init_debug_uart, ra, rb, rc`
			`addruart \ra, \rb, \rc`
ARM: UniPhier: use 32 bit register access for debug UART setting For the same reason as commit d0c47b3ef7c5 (serial: UniPhier: use 32 bit register access), use "str" instead of "strb" for the LCR register setting. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> 2015-05-29 08:30:02 +00:00			`mov \rb, #UART_LCR_WLEN8 << 8`
			`str \rb, [\ra, #0x10]`
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> 2015-01-06 05:28:16 +00:00			`ldr \rb, =DIVISOR`
			`str \rb, [\ra, #0x24]`
			`.endm`