Add low-level debug support for MPS2, so that earlyprintk can be enabled for debugging early boot issues. Signed-off-by: Vladimir Murzin <vladimir.murzin@xxxxxxx> --- arch/arm/Kconfig.debug | 12 +++++++++++- arch/arm/include/debug/mps2.S | 27 +++++++++++++++++++++++++++ 2 files changed, 38 insertions(+), 1 deletion(-) create mode 100644 arch/arm/include/debug/mps2.S diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index c6b6175..fcd2e15 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -485,6 +485,13 @@ choice Say Y here if you want kernel low-level debugging support on MMP UART3. + config DEBUG_MPS2_UART + bool "Kernel low-level debugging message via MPS2 UART0" + depends on ARCH_MPS2 + help + Say Y here if you want kernel low-level debugging support + on MPS2 based platforms. + config DEBUG_MVEBU_UART0 bool "Kernel low-level debugging messages via MVEBU UART0 (old bootloaders)" depends on ARCH_MVEBU @@ -1415,6 +1422,7 @@ config DEBUG_LL_INCLUDE default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1 default "debug/bcm63xx.S" if DEBUG_BCM63XX_UART default "debug/digicolor.S" if DEBUG_DIGICOLOR_UA0 + default "debug/mps2.S" if DEBUG_MPS2_UART default "mach/debug-macro.S" # Compatibility options for PL01x @@ -1463,6 +1471,7 @@ config DEBUG_UART_PHYS default 0x20201000 if DEBUG_BCM2835 default 0x3f201000 if DEBUG_BCM2836 default 0x3e000000 if DEBUG_BCM_KONA_UART + default 0x40004000 if DEBUG_MPS2_UART default 0x4000e400 if DEBUG_LL_UART_EFM32 default 0x40081000 if DEBUG_LPC18XX_UART0 default 0x40090000 if DEBUG_LPC32XX @@ -1539,7 +1548,8 @@ config DEBUG_UART_PHYS DEBUG_S3C64XX_UART || \ DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \ DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \ - DEBUG_AT91_UART + DEBUG_AT91_UART || \ + DEBUG_MPS2_UART config DEBUG_UART_VIRT hex "Virtual base address of debug UART" diff --git a/arch/arm/include/debug/mps2.S b/arch/arm/include/debug/mps2.S new file mode 100644 index 0000000..0ced0ce --- /dev/null +++ b/arch/arm/include/debug/mps2.S @@ -0,0 +1,27 @@ +/* + * Copyright (C) 2015 ARM Limited + * + * Author: Vladimir Murzin <vladimir.murzin@xxxxxxx> + * + * 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. + * + */ + + .macro addruart, rp, tmp1, tmp2 + ldr \rp, =CONFIG_DEBUG_UART_PHYS + .endm + + .macro senduart, rd, rx + strb \rd, [\rx] @ Data Register + .endm + + .macro busyuart, rd, rx +1001: ldrb \rd, [\rx, #0x4] @ State Register + tst \rd, #1 @ busy + bne 1001b @ wait until transmit done + .endm + + .macro waituart,rd,rx + .endm -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
