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Commit e23814da authored by Baruch Siach's avatar Baruch Siach Committed by Olof Johansson
Browse files

ARM: digicolor: add low level debug support 



Use the USART peripheral as UART for low level debug. Only the UA0 port is
currently supported.

Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarBaruch Siach <baruch@tkos.co.il>
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parent df8d742e

arch/arm/Kconfig.debug

+11 −2
Original line number Diff line number Diff line
@@ -247,6 +247,13 @@ choice 
		  Say Y here if you want the debug print routines to direct

		  their output to the serial port in the DC21285 (Footbridge).



	config DEBUG_DIGICOLOR_UA0

		bool "Kernel low-level debugging messages via Digicolor UA0"

		depends on ARCH_DIGICOLOR

		help

		  Say Y here if you want the debug print routines to direct

		  their output to the UA0 serial port in the CX92755.



	config DEBUG_FOOTBRIDGE_COM1

		bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"

		depends on FOOTBRIDGE
@@ -1255,6 +1262,7 @@ config DEBUG_LL_INCLUDE 
	default "debug/vt8500.S" if DEBUG_VT8500_UART0

	default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1

	default "debug/bcm63xx.S" if DEBUG_UART_BCM63XX

	default "debug/digicolor.S" if DEBUG_DIGICOLOR_UA0

	default "mach/debug-macro.S"



# Compatibility options for PL01x
@@ -1377,7 +1385,7 @@ config DEBUG_UART_PHYS 
		DEBUG_RMOBILE_SCIFA0 || DEBUG_RMOBILE_SCIFA1 || \

		DEBUG_RMOBILE_SCIFA4 || DEBUG_S3C24XX_UART || \

		DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART || \

		DEBUG_SIRFSOC_UART

		DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0



config DEBUG_UART_VIRT

	hex "Virtual base address of debug UART"
@@ -1460,7 +1468,8 @@ config DEBUG_UART_VIRT 
	depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \

		DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_MESON_UARTAO || \

		DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART || \

		DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART || DEBUG_SIRFSOC_UART

		DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART || \

		DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0



config DEBUG_UART_8250_SHIFT

	int "Register offset shift for the 8250 debug UART"

arch/arm/include/debug/digicolor.S

0 → 100644
+35 −0
Original line number Diff line number Diff line 
/*

 * Debugging macro include header for Conexant Digicolor USART

 *

 * Copyright (C) 2014 Paradox Innovation Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

*/



#define UA0_STATUS	0x0742

#define UA0_EMI_REC	0x0744



#define UA0_STATUS_TX_READY	0x40



#ifdef CONFIG_DEBUG_UART_PHYS

		.macro	addruart, rp, rv, tmp

		ldr	\rp, =CONFIG_DEBUG_UART_PHYS

		ldr	\rv, =CONFIG_DEBUG_UART_VIRT

		.endm

#endif



		.macro	senduart,rd,rx

		strb	\rd, [\rx, #UA0_EMI_REC]

		.endm



		.macro	waituart,rd,rx

		.endm



	.macro	busyuart,rd,rx

1001:		ldrb	\rd, [\rx, #UA0_STATUS]

		tst	\rd, #UA0_STATUS_TX_READY

		beq	1001b

		.endm