[PATCH 4/4] arm: mediatek: Add earlyprintk support for MT6589

From: Matthias Brugger
Date: Wed Apr 09 2014 - 15:46:29 EST

Signed-off-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
---
arch/arm/Kconfig.debug | 49 +++++++++++++++++++++++++++++++++++--
arch/arm/include/debug/mediatek.S | 38 ++++++++++++++++++++++++++++
2 files changed, 85 insertions(+), 2 deletions(-)
create mode 100644 arch/arm/include/debug/mediatek.S

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 4a2fc0b..dc51495 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -797,6 +797,38 @@ choice
Say Y here if you want kernel low-level debugging support
on Ux500 based platforms.

+ config DEBUG_MTK6589_UART0
+ depends on ARCH_MEDIATEK
+ bool "Mediatek mt6589 UART0"
+ select DEBUG_UART_MEDIATEK
+ help
+ Say Y here if you want kernel low-level debugging support
+ on Mediatek mt6589 based platforms.
+
+ config DEBUG_MTK6589_UART1
+ depends on ARCH_MEDIATEK
+ bool "Mediatek mt6589 UART1"
+ select DEBUG_UART_MEDIATEK
+ help
+ Say Y here if you want kernel low-level debugging support
+ on Mediatek mt6589 based platforms.
+
+ config DEBUG_MTK6589_UART2
+ depends on ARCH_MEDIATEK
+ bool "Mediatek mt6589 UART2"
+ select DEBUG_UART_MEDIATEK
+ help
+ Say Y here if you want kernel low-level debugging support
+ on Mediatek mt6589 based platforms.
+
+ config DEBUG_MTK6589_UART3
+ depends on ARCH_MEDIATEK
+ bool "Mediatek mt6589 UART3"
+ select DEBUG_UART_MEDIATEK
+ help
+ Say Y here if you want kernel low-level debugging support
+ on Mediatek mt6589 based platforms.
+
config DEBUG_VEXPRESS_UART0_DETECT
bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
depends on ARCH_VEXPRESS && CPU_CP15_MMU
@@ -954,6 +986,10 @@ config DEBUG_MSM_UART
bool
depends on ARCH_MSM || ARCH_QCOM

+config DEBUG_UART_MEDIATEK
+ bool
+ depends on ARCH_MEDIATEK
+
config DEBUG_LL_INCLUDE
string
default "debug/8250.S" if DEBUG_LL_UART_8250 || DEBUG_UART_8250
@@ -971,6 +1007,7 @@ config DEBUG_LL_INCLUDE
DEBUG_IMX53_UART ||\
DEBUG_IMX6Q_UART || \
DEBUG_IMX6SL_UART
+ default "debug/mediatek.S" if DEBUG_UART_MEDIATEK
default "debug/msm.S" if DEBUG_MSM_UART
default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
@@ -1043,6 +1080,10 @@ config DEBUG_UART_PHYS
default 0xd0012000 if DEBUG_MVEBU_UART
default 0xd4017000 if DEBUG_MMP_UART2
default 0xd4018000 if DEBUG_MMP_UART3
+ default 0x11006000 if DEBUG_MTK6589_UART0
+ default 0x11007000 if DEBUG_MTK6589_UART1
+ default 0x11008000 if DEBUG_MTK6589_UART2
+ default 0x11009000 if DEBUG_MTK6589_UART3
default 0xe0000000 if ARCH_SPEAR13XX
default 0xf0000be0 if ARCH_EBSA110
default 0xf1012000 if DEBUG_MVEBU_UART_ALTERNATE
@@ -1058,7 +1099,7 @@ config DEBUG_UART_PHYS
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
+ DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_UART_MEDIATEK

config DEBUG_UART_VIRT
hex "Virtual base address of debug UART"
@@ -1087,6 +1128,10 @@ config DEBUG_UART_VIRT
default 0xfe012000 if ARCH_ORION5X
default 0xfe017000 if DEBUG_MMP_UART2
default 0xfe018000 if DEBUG_MMP_UART3
+ default 0xF1006000 if DEBUG_MTK6589_UART0
+ default 0xF1007000 if DEBUG_MTK6589_UART1
+ default 0xF1008000 if DEBUG_MTK6589_UART2
+ default 0xF1009000 if DEBUG_MTK6589_UART3
default 0xfe100000 if DEBUG_IMX23_UART || DEBUG_IMX28_UART
default 0xfe230000 if DEBUG_PICOXCELL_UART
default 0xfe300000 if DEBUG_BCM_KONA_UART
@@ -1116,7 +1161,7 @@ config DEBUG_UART_VIRT
default 0xff003000 if DEBUG_U300_UART
default DEBUG_UART_PHYS if !MMU
depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
- DEBUG_UART_8250 || DEBUG_UART_PL01X
+ DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_UART_MEDIATEK

config DEBUG_UART_8250_SHIFT
int "Register offset shift for the 8250 debug UART"
diff --git a/arch/arm/include/debug/mediatek.S b/arch/arm/include/debug/mediatek.S
new file mode 100644
index 0000000..98e8414
--- /dev/null
+++ b/arch/arm/include/debug/mediatek.S
@@ -0,0 +1,38 @@
+/*
+ * Low-level debug macro for Mediatek SoCs
+ *
+ * Copyright (c) 2014 MundoReader S.L.
+ * Author: Matthias Brugger <matthias.bgg@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/serial_reg.h>
+
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =CONFIG_DEBUG_UART_PHYS
+ ldr \rv, =CONFIG_DEBUG_UART_VIRT
+ .endm
+
+ .macro senduart,rd,rx
+ strb \rd, [\rx, #0x0]
+ .endm
+
+ .macro waituart,rd,rx
+1001: ldr \rd, [\rx, #0x14]
+ tst \rd, #0x40
+ beq 1001b
+ .endm
+
+ .macro busyuart,rd,rx
+1002: ldr \rd, [\rx, #0x14]
+ tst \rd, #0x40
+ beq 1002b
+ .endm
--
1.7.9.5

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