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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: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Baruch Siach 2015-01-14 10:40:31 +02:00 committed by Olof Johansson
parent df8d742e92
commit e23814da82
2 changed files with 46 additions and 2 deletions
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13
arch/arm/Kconfig.debug
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@ -247,6 +247,13 @@ choice
Say Y here if you want the debug print routines to direct Say Y here if you want the debug print routines to direct
their output to the serial port in the DC21285 (Footbridge). 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 config DEBUG_FOOTBRIDGE_COM1
bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1" bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
depends on FOOTBRIDGE depends on FOOTBRIDGE
@ -1255,6 +1262,7 @@ config DEBUG_LL_INCLUDE
default "debug/vt8500.S" if DEBUG_VT8500_UART0 default "debug/vt8500.S" if DEBUG_VT8500_UART0
default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
default "debug/bcm63xx.S" if DEBUG_UART_BCM63XX default "debug/bcm63xx.S" if DEBUG_UART_BCM63XX
default "debug/digicolor.S" if DEBUG_DIGICOLOR_UA0
default "mach/debug-macro.S" default "mach/debug-macro.S"
# Compatibility options for PL01x # Compatibility options for PL01x
@ -1377,7 +1385,7 @@ config DEBUG_UART_PHYS
DEBUG_RMOBILE_SCIFA0 || DEBUG_RMOBILE_SCIFA1 || \ DEBUG_RMOBILE_SCIFA0 || DEBUG_RMOBILE_SCIFA1 || \
DEBUG_RMOBILE_SCIFA4 || DEBUG_S3C24XX_UART || \ DEBUG_RMOBILE_SCIFA4 || DEBUG_S3C24XX_UART || \
DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART || \ DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART || \
DEBUG_SIRFSOC_UART DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0
config DEBUG_UART_VIRT config DEBUG_UART_VIRT
hex "Virtual base address of debug UART" 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 || \ depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_MESON_UARTAO || \ DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_MESON_UARTAO || \
DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART || \ 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 config DEBUG_UART_8250_SHIFT
int "Register offset shift for the 8250 debug UART" int "Register offset shift for the 8250 debug UART"

35
arch/arm/include/debug/digicolor.S Normal file
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@ -0,0 +1,35 @@
/*
* 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