[PATCH v1 07/10] ARM: mps2: add low-level debug support

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,
	afaerber@suse.de, mcoquelin.stm32@gmail.com
Cc: Mark.Rutland@arm.com, Pawel.Moll@arm.com,
	ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
	jslaby@suse.cz, robh+dt@kernel.org, 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 v1 07/10] ARM: mps2: add low-level debug support
Date: Wed,  2 Dec 2015 09:33:07 +0000	[thread overview]
Message-ID: <1449048790-25859-8-git-send-email-vladimir.murzin@arm.com> (raw)
In-Reply-To: <1449048790-25859-1-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 259c0ca..cfbf09a 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -479,6 +479,13 @@ 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_QCOM_UARTDM
 		bool "Kernel low-level debugging messages via QCOM UARTDM"
 		depends on ARCH_QCOM
@@ -1350,6 +1357,7 @@ config DEBUG_LL_INCLUDE
 	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 "debug/mps2.S" if DEBUG_MPS2_UART
 	default "mach/debug-macro.S"
 
 # Compatibility options for PL01x
@@ -1403,6 +1411,7 @@ config DEBUG_UART_PHYS
 	default 0x20068000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3
 	default 0x20201000 if DEBUG_BCM2835
 	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 ARCH_LPC32XX
@@ -1476,7 +1485,8 @@ config DEBUG_UART_PHYS
 		DEBUG_RMOBILE_SCIFA4 || DEBUG_S3C24XX_UART || \
 		DEBUG_UART_BCM63XX || 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

