diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2013-10-08 16:44:17 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-10-29 11:06:04 +0000 |
| commit | 494e492dd88d36cd201eae99873492450d1e9b4f (patch) | |
| tree | 1137d16a179ef29ac5c001e97c2ce1b5f48fec4b | |
| parent | 3159f372354e8e1f5dee714663d705dd2c7e0759 (diff) | |
ARM: 7850/1: DEBUG_LL on efm32 SoCs
This implements output of debug messages on efm32 SoCs.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/Kconfig.debug | 17 | ||||
| -rw-r--r-- | arch/arm/include/debug/efm32.S | 45 |
2 files changed, 62 insertions, 0 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 9762c84b419..2b320682435 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -834,6 +834,20 @@ choice options; the platform specific options are deprecated and will be soon removed. + config DEBUG_LL_UART_EFM32 + bool "Kernel low-level debugging via efm32 UART" + depends on ARCH_EFM32 + help + Say Y here if you want the debug print routines to direct + their output to an UART or USART port on efm32 based + machines. Use the following addresses for DEBUG_UART_PHYS: + + 0x4000c000 | USART0 + 0x4000c400 | USART1 + 0x4000c800 | USART2 + 0x4000e000 | UART0 + 0x4000e400 | UART1 + config DEBUG_LL_UART_PL01X bool "Kernel low-level debugging via ARM Ltd PL01x Primecell UART" help @@ -885,6 +899,7 @@ config DEBUG_LL_INCLUDE default "debug/8250.S" if DEBUG_LL_UART_8250 || DEBUG_UART_8250 default "debug/pl01x.S" if DEBUG_LL_UART_PL01X || DEBUG_UART_PL01X default "debug/exynos.S" if DEBUG_EXYNOS_UART + default "debug/efm32.S" if DEBUG_LL_UART_EFM32 default "debug/icedcc.S" if DEBUG_ICEDCC default "debug/imx.S" if DEBUG_IMX1_UART || \ DEBUG_IMX25_UART || \ @@ -951,6 +966,7 @@ config DEBUG_UART_PHYS default 0x20064000 if DEBUG_RK29_UART1 || DEBUG_RK3X_UART2 default 0x20068000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3 default 0x20201000 if DEBUG_BCM2835 + default 0x4000e400 if DEBUG_LL_UART_EFM32 default 0x40090000 if ARCH_LPC32XX default 0x40100000 if DEBUG_PXA_UART1 default 0x42000000 if ARCH_GEMINI @@ -981,6 +997,7 @@ config DEBUG_UART_PHYS default 0xfff36000 if DEBUG_HIGHBANK_UART default 0xfffff700 if ARCH_IOP33X depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \ + DEBUG_LL_UART_EFM32 || \ DEBUG_UART_8250 || DEBUG_UART_PL01X config DEBUG_UART_VIRT diff --git a/arch/arm/include/debug/efm32.S b/arch/arm/include/debug/efm32.S new file mode 100644 index 00000000000..2265a199280 --- /dev/null +++ b/arch/arm/include/debug/efm32.S @@ -0,0 +1,45 @@ +/* + * Copyright (C) 2013 Pengutronix + * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> + * + * 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 UARTn_CMD 0x000c +#define UARTn_CMD_TXEN 0x0004 + +#define UARTn_STATUS 0x0010 +#define UARTn_STATUS_TXC 0x0020 +#define UARTn_STATUS_TXBL 0x0040 + +#define UARTn_TXDATA 0x0034 + + .macro addruart, rx, tmp + ldr \rx, =(CONFIG_DEBUG_UART_PHYS) + + /* + * enable TX. The driver might disable it to save energy. We + * don't care about disabling at the end as during debug power + * consumption isn't that important. + */ + ldr \tmp, =(UARTn_CMD_TXEN) + str \tmp, [\rx, #UARTn_CMD] + .endm + + .macro senduart,rd,rx + strb \rd, [\rx, #UARTn_TXDATA] + .endm + + .macro waituart,rd,rx +1001: ldr \rd, [\rx, #UARTn_STATUS] + tst \rd, #UARTn_STATUS_TXBL + beq 1001b + .endm + + .macro busyuart,rd,rx +1001: ldr \rd, [\rx, UARTn_STATUS] + tst \rd, #UARTn_STATUS_TXC + bne 1001b + .endm |