linux-kernel - [PATCH 6/6] ARM: versatile: Make able to use UART ports for KGDB FIQ debugger

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Message-Id: <1341529960-18370-6-git-send-email-anton.vorontsov@linaro.org>
Date:	Thu,  5 Jul 2012 16:12:40 -0700
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	Russell King <linux@....linux.org.uk>,
	Jason Wessel <jason.wessel@...driver.com>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	Colin Cross <ccross@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	kernel-team@...roid.com, kgdb-bugreport@...ts.sourceforge.net
Subject: [PATCH 6/6] ARM: versatile: Make able to use UART ports for KGDB FIQ debugger

If enabled, kernel will able to enter KGDB upon serial line activity on
UART ports.

Note that even with this patch and CONFIG_KGDB_FIQ is enabled, you still
need to pass kgdb_fiq.enable=1 kernel command line option, otherwise UART
will behave in a normal way.

By default UART0 is used, but this can be changed via kgdb_fiq.uart_num
kernel command line option.

Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>
---
 arch/arm/mach-versatile/Makefile            |    1 +
 arch/arm/mach-versatile/include/mach/irqs.h |    1 +
 arch/arm/mach-versatile/kgdb_fiq.c          |   40 +++++++++++++++++++++++++++
 3 files changed, 42 insertions(+)
 create mode 100644 arch/arm/mach-versatile/kgdb_fiq.c

diff --git a/arch/arm/mach-versatile/Makefile b/arch/arm/mach-versatile/Makefile
index 81fa3fe..bfd761f 100644
--- a/arch/arm/mach-versatile/Makefile
+++ b/arch/arm/mach-versatile/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_ARCH_VERSATILE_PB)		+= versatile_pb.o
 obj-$(CONFIG_MACH_VERSATILE_AB)		+= versatile_ab.o
 obj-$(CONFIG_MACH_VERSATILE_DT)		+= versatile_dt.o
 obj-$(CONFIG_PCI)			+= pci.o
+obj-$(CONFIG_KGDB_FIQ)			+= kgdb_fiq.o
diff --git a/arch/arm/mach-versatile/include/mach/irqs.h b/arch/arm/mach-versatile/include/mach/irqs.h
index bf44c61..fcd2a95 100644
--- a/arch/arm/mach-versatile/include/mach/irqs.h
+++ b/arch/arm/mach-versatile/include/mach/irqs.h
@@ -26,6 +26,7 @@
  *  held within platform.h
  */
 #define IRQ_VIC_START		0
+#define FIQ_START		IRQ_VIC_START
 #define IRQ_WDOGINT		(IRQ_VIC_START + INT_WDOGINT)
 #define IRQ_SOFTINT		(IRQ_VIC_START + INT_SOFTINT)
 #define IRQ_COMMRx		(IRQ_VIC_START + INT_COMMRx)
diff --git a/arch/arm/mach-versatile/kgdb_fiq.c b/arch/arm/mach-versatile/kgdb_fiq.c
new file mode 100644
index 0000000..c82e8ce
--- /dev/null
+++ b/arch/arm/mach-versatile/kgdb_fiq.c
@@ -0,0 +1,40 @@
+/*
+ * KGDB FIQ entry board/IC support
+ *
+ * Copyright 2012 Linaro Ltd.
+ *		  Anton Vorontsov <anton.vorontsov@...aro.org>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kgdb.h>
+#include <mach/hardware.h>
+#include <mach/platform.h>
+#include <asm/kgdb.h>
+#include <asm/hardware/vic.h>
+
+static int kgdb_fiq;
+module_param_named(uart_num, kgdb_fiq, int, 0600);
+MODULE_PARM_DESC(uart_num, "UART<number> port to use for KGDB FIQ");
+
+static bool is_kgdb_nmi(void)
+{
+	return vic_is_fiq_rised(kgdb_fiq);
+}
+
+void kgdb_arch_enable_nmi(bool on)
+{
+	vic_fiq_select(kgdb_fiq, on);
+}
+
+static int kgdb_fiq_init(void)
+{
+	kgdb_fiq += INT_UARTINT0;
+	kgdb_register_nmi(is_kgdb_nmi);
+	return 0;
+}
+console_initcall(kgdb_fiq_init);
-- 
1.7.10.4

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