[PATCH v2 2/8] ARM: digicolor: add low level debug support

Baruch Siach
2015-01-08T19:39:58Z

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
---
arch/arm/Kconfig.debug | 12 ++++++++++--
arch/arm/include/debug/digicolor.S | 35 +++++++++++++++++++++++++++++++++++
2 files changed, 45 insertions(+), 2 deletions(-)
create mode 100644 arch/arm/include/debug/digicolor.S

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 5ddd4906f7a7..7ccab0629dd2 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -241,6 +241,13 @@ choice
Say Y here if you want the debug print routines to direct
their output to the serial port in the DC21285 (Footbridge).

+ config DEBUG_DIGICOLOR_UA0
+ bool "Kernel low-level debugging messages via Digicolor UA0"
+ depends on ARCH_DIGICOLOR
+ help
+ Say Y here if you want the debug print routines to direct
+ their output to the UA0 serial port in the CX92755.
+
config DEBUG_FOOTBRIDGE_COM1
bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
depends on FOOTBRIDGE
@@ -1204,6 +1211,7 @@ config DEBUG_LL_INCLUDE
default "debug/vt8500.S" if DEBUG_VT8500_UART0
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 "mach/debug-macro.S"

# Compatibility options for PL01x
@@ -1320,7 +1328,7 @@ config DEBUG_UART_PHYS
DEBUG_RCAR_GEN2_SCIF0 || DEBUG_RCAR_GEN2_SCIF2 || \
DEBUG_RMOBILE_SCIFA0 || DEBUG_RMOBILE_SCIFA1 || \
DEBUG_RMOBILE_SCIFA4 || DEBUG_S3C24XX_UART || \
- DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART
+ DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART || DEBUG_DIGICOLOR_UA0

config DEBUG_UART_VIRT
hex "Virtual base address of debug UART"
@@ -1398,7 +1406,7 @@ config DEBUG_UART_VIRT
depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_MESON_UARTAO || \
DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART || \
- DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART
+ DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART || DEBUG_DIGICOLOR_UA0

config DEBUG_UART_8250_SHIFT
int "Register offset shift for the 8250 debug UART"
diff --git a/arch/arm/include/debug/digicolor.S b/arch/arm/include/debug/digicolor.S
new file mode 100644
index 000000000000..c9517150766a
--- /dev/null
+++ b/arch/arm/include/debug/digicolor.S
@@ -0,0 +1,35 @@
+/*
+ * Debugging macro include header for Conexant Digicolor USART
+ *
+ * Copyright (C) 2014 Paradox Innovation Ltd.
+ *
+ * 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 UA0_STATUS 0x0742
+#define UA0_EMI_REC 0x0744
+
+#define UA0_STATUS_TX_READY 0x40
+
+#ifdef CONFIG_DEBUG_UART_PHYS
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =CONFIG_DEBUG_UART_PHYS
+ ldr \rv, =CONFIG_DEBUG_UART_VIRT
+ .endm
+#endif
+
+ .macro senduart,rd,rx
+ strb \rd, [\rx, #UA0_EMI_REC]
+ .endm
+
+ .macro waituart,rd,rx
+ .endm
+
+ .macro busyuart,rd,rx
+1001: ldrb \rd, [\rx, #UA0_STATUS]
+ tst \rd, #UA0_STATUS_TX_READY
+ beq 1001b
+ .endm
--
2.1.4