diff options
| author | Baruch Siach <baruch@tkos.co.il> | 2015-01-14 10:40:31 +0200 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2015-01-27 15:11:51 -0800 |
| commit | e23814da826283ee540f2c0837bba1937cd8f6b5 (patch) | |
| tree | 63191ca025fe9368622d4f643eb025f0f50b538a /arch | |
| parent | df8d742e9299ef6c0fdc3edf6f028f211f683a7b (diff) | |
| download | op-kernel-dev-e23814da826283ee540f2c0837bba1937cd8f6b5.zip op-kernel-dev-e23814da826283ee540f2c0837bba1937cd8f6b5.tar.gz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig.debug | 13 | ||||
| -rw-r--r-- | arch/arm/include/debug/digicolor.S | 35 |
2 files changed, 46 insertions, 2 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 453ae2f..b6a073d 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -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" diff --git a/arch/arm/include/debug/digicolor.S b/arch/arm/include/debug/digicolor.S new file mode 100644 index 0000000..c951715 --- /dev/null +++ b/arch/arm/include/debug/digicolor.S @@ -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 |
