From: Anton Vorontsov <anton.voront...@linaro.org>
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.
Cc: Anton Vorontsov <anton.voront...@linaro.org>
Cc: Russell King <li...@arm.linux.org.uk>
Cc: Nicolas Pitre <nicolas.pi...@linaro.org>
Cc: Arnd Bergmann <a...@arndb.de>
Cc: Jason Wessel <jason.wes...@windriver.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: linux-arm-ker...@lists.infradead.org
Cc: kernel-t...@android.com
Signed-off-by: Anton Vorontsov <anton.voront...@linaro.org>
Signed-off-by: John Stultz <john.stu...@linaro.org>
---
arch/arm/Kconfig | 1 +
arch/arm/mach-versatile/Makefile | 1 +
arch/arm/mach-versatile/kgdb_fiq.c | 55 ++++++++++++++++++++++++++++++++++++++
3 files changed, 57 insertions(+)
create mode 100644 arch/arm/mach-versatile/kgdb_fiq.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 66a9076..9909af3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -364,6 +364,7 @@ config ARCH_VERSATILE
select PLAT_VERSATILE_CLCD
select PLAT_VERSATILE_CLOCK
select VERSATILE_FPGA_IRQ
+ select ARCH_MIGHT_HAVE_KGDB_FIQ
help
This enables support for ARM Ltd Versatile board.
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/kgdb_fiq.c
b/arch/arm/mach-versatile/kgdb_fiq.c
new file mode 100644
index 0000000..dd92e40
--- /dev/null
+++ b/arch/arm/mach-versatile/kgdb_fiq.c
@@ -0,0 +1,55 @@
+/*
+ * KGDB FIQ board support
+ *
+ * Copyright 2012 Linaro Ltd.
+ * Anton Vorontsov <anton.voront...@linaro.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/init.h>
+#include <linux/io.h>
+#include <linux/kgdb.h>
+#include <mach/hardware.h>
+#include <mach/platform.h>
+#include <asm/hardware/vic.h>
+
+static void *kgdb_irq_base;
+
+static int kgdb_irq;
+module_param_named(uart_num, kgdb_irq, int, 0600);
+MODULE_PARM_DESC(uart_num, "UART<number> port to use for KGDB FIQ");
+
+static void kgdb_fiq_select(bool on)
+{
+ void __iomem *sel = kgdb_irq_base + VIC_INT_SELECT;
+ u32 msk = 1 << kgdb_irq;
+ u32 val;
+
+ pr_debug("rerouting VIC vector %d to %s\n", kgdb_irq,
+ on ? "FIQ" : "IRQ");
+
+ val = readl(sel);
+ val &= ~msk;
+ if (on)
+ val |= msk;
+ writel(val, sel);
+}
+
+static bool kgdb_is_fiq_rised(void)
+{
+ return readl(kgdb_irq_base + VIC_FIQ_STATUS) & (1 << kgdb_irq);
+}
+
+static int __init kgdb_fiq_init(void)
+{
+ kgdb_irq_base = __io_address(VERSATILE_VIC_BASE);
+ kgdb_irq += INT_UARTINT0;
+ WARN_ON(kgdb_irq > INT_UARTINT2);
+
+ return kgdb_register_fiq(kgdb_fiq_select, kgdb_is_fiq_rised);
+}
+console_initcall(kgdb_fiq_init);
--
1.8.1.2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
