From: Vladimir Murzin <vladimir.murzin@arm.com>
To: arnd@arndb.de, linux@arm.linux.org.uk,
gregkh@linuxfoundation.org, daniel.lezcano@linaro.org,
tglx@linutronix.de, u.kleine-koenig@pengutronix.de
Cc: mark.rutland@arm.com, pawel.moll@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
jslaby@suse.cz, robh+dt@kernel.org, andy.shevchenko@gmail.com,
devicetree@vger.kernel.org, linux-serial@vger.kernel.org,
linux-api@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v3 07/10] ARM: mps2: add low-level debug support
Date: Tue, 16 Feb 2016 10:08:12 +0000 [thread overview]
Message-ID: <1455617295-23736-8-git-send-email-vladimir.murzin@arm.com> (raw)
In-Reply-To: <1455617295-23736-1-git-send-email-vladimir.murzin@arm.com>
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@arm.com>
---
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@arm.com>
+ *
+ * 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
next prev parent reply other threads:[~2016-02-16 10:11 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-16 10:08 [PATCH v3 00/10] Support for Cortex-M Prototyping System Vladimir Murzin
2016-02-16 10:08 ` [PATCH v3 01/10] dt-bindings: document the MPS2 timer bindings Vladimir Murzin
2016-02-16 10:08 ` [PATCH v3 02/10] clockevents/drivers: add MPS2 Timer driver Vladimir Murzin
2016-02-16 10:08 ` [PATCH v3 03/10] dt-bindings: document the MPS2 UART bindings Vladimir Murzin
2016-02-16 10:08 ` [PATCH v3 04/10] serial: mps2-uart: add MPS2 UART driver Vladimir Murzin
2016-02-16 10:48 ` Andy Shevchenko
2016-02-16 14:25 ` Vladimir Murzin
2016-02-16 11:02 ` One Thousand Gnomes
2016-02-16 15:09 ` Vladimir Murzin
2016-02-16 10:08 ` [PATCH v3 05/10] serial: mps2-uart: add support for early console Vladimir Murzin
2016-02-16 10:36 ` Andy Shevchenko
2016-02-16 13:09 ` Vladimir Murzin
2016-02-16 13:13 ` Andy Shevchenko
2016-02-16 13:38 ` Vladimir Murzin
2016-02-16 14:00 ` Andy Shevchenko
2016-02-16 16:12 ` One Thousand Gnomes
2016-02-19 9:45 ` Vladimir Murzin
2016-02-19 9:57 ` Andy Shevchenko
2016-02-19 15:46 ` Peter Hurley
2016-02-19 16:27 ` Vladimir Murzin
2016-02-16 10:08 ` [PATCH v3 06/10] ARM: mps2: introduce MPS2 platform Vladimir Murzin
2016-02-16 10:56 ` Arnd Bergmann
2016-02-16 14:35 ` Vladimir Murzin
2016-02-16 14:39 ` Arnd Bergmann
2016-02-16 10:08 ` Vladimir Murzin [this message]
2016-02-16 10:08 ` [PATCH v3 08/10] ARM: configs: add MPS2 defconfig Vladimir Murzin
2016-02-16 10:58 ` Arnd Bergmann
2016-02-16 14:51 ` Vladimir Murzin
2016-02-16 15:08 ` Arnd Bergmann
2016-02-16 15:14 ` Vladimir Murzin
2016-02-16 10:08 ` [PATCH v3 09/10] ARM: dts: introduce MPS2 AN385/AN386 Vladimir Murzin
2016-02-16 11:01 ` Arnd Bergmann
2016-02-16 16:10 ` Vladimir Murzin
2016-02-17 16:48 ` Vladimir Murzin
2016-02-17 16:58 ` Arnd Bergmann
2016-02-18 10:11 ` Vladimir Murzin
2016-02-18 10:45 ` Arnd Bergmann
2016-02-18 11:13 ` Vladimir Murzin
2016-02-18 12:16 ` Arnd Bergmann
2016-02-18 12:47 ` Vladimir Murzin
2016-02-16 15:17 ` Linus Walleij
2016-02-16 15:37 ` Vladimir Murzin
2016-02-16 10:08 ` [PATCH v3 10/10] ARM: dts: introduce MPS2 AN399/AN400 Vladimir Murzin
2016-02-16 11:05 ` [PATCH v3 00/10] Support for Cortex-M Prototyping System Arnd Bergmann
2016-02-16 16:14 ` Vladimir Murzin
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