linux-kernel - [PATCH] arm: ks8695: Migrate debug

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Message-Id: <1405506667-4649-1-git-send-email-daniel.thompson@linaro.org>
Date:	Wed, 16 Jul 2014 11:31:07 +0100
From:	Daniel Thompson <daniel.thompson@...aro.org>
To:	Russell King <linux@....linux.org.uk>
Cc:	Daniel Thompson <daniel.thompson@...aro.org>,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	linaro-kernel@...ts.linaro.org, Greg Ungerer <gerg@...inux.org>,
	Arnd Bergmann <arnd.bergmann@...aro.org>
Subject: [PATCH] arm: ks8695: Migrate debug_ll macros to shared directory

As part of the migration a couple of uart definitions have been copied
from of the platform specific header files.

Note that, in order to keep oldconfig working nicely we must defer the
removal of arch/arm/mach-ks8695/include/mach/debug-macro.S until
DEBUG_LL_UART_NONE has been removed.

Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
Cc: Russell King <linux@....linux.org.uk>
Cc: Greg Ungerer <gerg@...inux.org>
Cc: Arnd Bergmann <arnd.bergmann@...aro.org>
---

Notes:
    This is a contribution towards the removal of DEBUG_LL_UART_NONE, see
    http://thread.gmane.org/gmane.linux.kernel/1712068/focus=1746065 for
    details.

 arch/arm/Kconfig.debug          |  8 ++++++++
 arch/arm/include/debug/ks8695.S | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 arch/arm/include/debug/ks8695.S

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 8f90595..6f9664a 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -340,6 +340,13 @@ choice
 		  Say Y here if you want the debug print routines to direct
 		  their output to UART1 serial port on KEYSTONE2 devices.
 
+	config DEBUG_KS8695_UART
+		bool "KS8695 Debug UART"
+		depends on ARCH_KS8695
+		help
+		  Say Y here if you want kernel low-level debugging support
+		  on KS8695.
+
 	config DEBUG_MMP_UART2
 		bool "Kernel low-level debugging message via MMP UART2"
 		depends on ARCH_MMP
@@ -1006,6 +1013,7 @@ config DEBUG_LL_INCLUDE
 				 DEBUG_IMX6Q_UART || \
 				 DEBUG_IMX6SL_UART || \
 				 DEBUG_IMX6SX_UART
+	default "debug/ks8695.S" if DEBUG_KS8695_UART
 	default "debug/msm.S" if DEBUG_MSM_UART || DEBUG_QCOM_UARTDM
 	default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
 	default "debug/s3c24xx.S" if DEBUG_S3C24XX_UART
diff --git a/arch/arm/include/debug/ks8695.S b/arch/arm/include/debug/ks8695.S
new file mode 100644
index 0000000..961da1f
--- /dev/null
+++ b/arch/arm/include/debug/ks8695.S
@@ -0,0 +1,40 @@
+/*
+ * arch/arm/include/debug/ks8695.S
+ *
+ * Copyright (C) 2006 Ben Dooks <ben@...tec.co.uk>
+ * Copyright (C) 2006 Simtec Electronics
+ *
+ * KS8695 - Debug macros
+ *
+ * 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 KS8695_UART_PA	0x03ffe000
+#define KS8695_UART_VA	0xf00fe000
+#define KS8695_URTH	(0x04)
+#define KS8695_URLS	(0x14)
+#define URLS_URTE	(1 << 6)
+#define URLS_URTHRE	(1 << 5)
+
+	.macro	addruart, rp, rv, tmp
+		ldr	\rp, =KS8695_UART_PA		@ physical base address
+		ldr	\rv, =KS8695_UART_VA		@ virtual base address
+	.endm
+
+	.macro	senduart, rd, rx
+		str	\rd, [\rx, #KS8695_URTH]	@ Write to Transmit Holding Register
+	.endm
+
+	.macro	busyuart, rd, rx
+1001:		ldr	\rd, [\rx, #KS8695_URLS]	@ Read Line Status Register
+		tst	\rd, #URLS_URTE			@ Holding & Shift registers empty?
+		beq	1001b
+	.endm
+
+	.macro	waituart, rd, rx
+1001:		ldr	\rd, [\rx, #KS8695_URLS]	@ Read Line Status Register
+		tst	\rd, #URLS_URTHRE		@ Holding Register empty?
+		beq	1001b
+	.endm
-- 
1.9.3

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