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metag: Add JTAG Debug Adapter (DA) support 

Add basic JTAG Debug Adapter (DA) support so that drivers which
communicate with the DA can detect whether one is actually present
(otherwise the target will halt indefinitely).

This allows the metag_da TTY driver and imgdafs filesystem driver to be
built, updates defconfigs, and sets up the metag_da console early if
it's configured in.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
This commit is contained in:
James Hogan 2012-09-21 17:38:15 +01:00
parent 690998b629
commit ae85ac71b7
9 changed files with 105 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
MAINTAINERS
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@ -5042,6 +5042,8 @@ F: Documentation/devicetree/bindings/metag/
F: drivers/clocksource/metag_generic.c
F: drivers/irqchip/irq-metag.c
F: drivers/irqchip/irq-metag-ext.c
F: drivers/tty/metag_da.c
F: fs/imgdafs/
MICROBLAZE ARCHITECTURE
M: Michal Simek <monstr@monstr.eu>

12
arch/metag/Kconfig
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@ -214,6 +214,18 @@ config METAG_PERFCOUNTER_IRQS
When disabled, Performance Counters information will be collected
based on Timer Interrupt.
config METAG_DA
bool "DA support"
help
Say Y if you plan to use a DA debug adapter with Linux. The presence
of the DA will be detected automatically at boot, so it is safe to say
Y to this option even when booting without a DA.
This enables support for services provided by DA JTAG debug adapters,
such as:
- communication over DA channels (such as the console driver).
- use of the DA filesystem.
menu "Boot options"
config METAG_BUILTIN_DTB

3
arch/metag/configs/meta1_defconfig
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@ -14,6 +14,7 @@ CONFIG_PARTITION_ADVANCED=y
# CONFIG_IOSCHED_CFQ is not set
CONFIG_FLATMEM_MANUAL=y
CONFIG_META12_FPGA=y
CONFIG_METAG_DA=y
CONFIG_HZ_100=y
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
@ -27,6 +28,8 @@ CONFIG_BLK_DEV_RAM_SIZE=16384
# CONFIG_SERIO is not set
# CONFIG_VT is not set
# CONFIG_LEGACY_PTYS is not set
CONFIG_DA_TTY=y
CONFIG_DA_CONSOLE=y
# CONFIG_DEVKMEM is not set
# CONFIG_HW_RANDOM is not set
# CONFIG_HWMON is not set

3
arch/metag/configs/meta2_defconfig
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@ -16,6 +16,7 @@ CONFIG_PARTITION_ADVANCED=y
CONFIG_METAG_L2C=y
CONFIG_FLATMEM_MANUAL=y
CONFIG_METAG_HALT_ON_PANIC=y
CONFIG_METAG_DA=y
CONFIG_HZ_100=y
CONFIG_DEVTMPFS=y
# CONFIG_STANDALONE is not set
@ -28,6 +29,8 @@ CONFIG_BLK_DEV_RAM_SIZE=16384
# CONFIG_SERIO is not set
# CONFIG_VT is not set
# CONFIG_LEGACY_PTYS is not set
CONFIG_DA_TTY=y
CONFIG_DA_CONSOLE=y
# CONFIG_DEVKMEM is not set
# CONFIG_HW_RANDOM is not set
# CONFIG_HWMON is not set

3
arch/metag/configs/meta2_smp_defconfig
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@ -17,6 +17,7 @@ CONFIG_METAG_L2C=y
CONFIG_FLATMEM_MANUAL=y
CONFIG_METAG_HALT_ON_PANIC=y
CONFIG_SMP=y
CONFIG_METAG_DA=y
CONFIG_HZ_100=y
CONFIG_DEVTMPFS=y
# CONFIG_STANDALONE is not set
@ -29,6 +30,8 @@ CONFIG_BLK_DEV_RAM_SIZE=16384
# CONFIG_SERIO is not set
# CONFIG_VT is not set
# CONFIG_LEGACY_PTYS is not set
CONFIG_DA_TTY=y
CONFIG_DA_CONSOLE=y
# CONFIG_DEVKMEM is not set
# CONFIG_HW_RANDOM is not set
# CONFIG_HWMON is not set

43
arch/metag/include/asm/da.h Normal file
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@ -0,0 +1,43 @@
/*
* Meta DA JTAG debugger control.
*
* Copyright 2012 Imagination Technologies Ltd.
*/
#ifndef _METAG_DA_H_
#define _METAG_DA_H_
#ifdef CONFIG_METAG_DA
#include <linux/init.h>
#include <linux/types.h>
extern bool _metag_da_present;
/**
* metag_da_enabled() - Find whether a DA is currently enabled.
*
* Returns: true if a DA was detected, false if not.
*/
static inline bool metag_da_enabled(void)
{
return _metag_da_present;
}
/**
* metag_da_probe() - Try and detect a connected DA.
*
* This is used at start up to detect whether a DA is active.
*
* Returns: 0 on detection, -err otherwise.
*/
int __init metag_da_probe(void);
#else /* !CONFIG_METAG_DA */
#define metag_da_enabled() false
#define metag_da_probe() do {} while (0)
#endif
#endif /* _METAG_DA_H_ */

1
arch/metag/kernel/Makefile
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@ -28,6 +28,7 @@ obj-y += user_gateway.o
obj-$(CONFIG_PERF_EVENTS) += perf/
obj-$(CONFIG_METAG_COREMEM) += coremem.o
obj-$(CONFIG_METAG_DA) += da.o
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
obj-$(CONFIG_FUNCTION_TRACER) += ftrace_stub.o
obj-$(CONFIG_MODULES) += metag_ksyms.o

23
arch/metag/kernel/da.c Normal file
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@ -0,0 +1,23 @@
/*
* Meta DA JTAG debugger control.
*
* Copyright 2012 Imagination Technologies Ltd.
*/
#include <linux/io.h>
#include <linux/kernel.h>
#include <asm/da.h>
#include <asm/metag_mem.h>
bool _metag_da_present;
int __init metag_da_probe(void)
{
_metag_da_present = (metag_in32(T0VECINT_BHALT) == 1);
if (_metag_da_present)
pr_info("DA present\n");
else
pr_info("DA not present\n");
return 0;
}

15
arch/metag/kernel/setup.c
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@ -37,6 +37,7 @@
#include <asm/hwthread.h>
#include <asm/mmzone.h>
#include <asm/l2cache.h>
#include <asm/da.h>
#include <asm/prom.h>
#include <asm/mach/arch.h>
#include <asm/core_reg.h>
@ -60,6 +61,11 @@ extern char _heap_start[];
extern u32 __dtb_start[];
#endif
#ifdef CONFIG_DA_CONSOLE
/* Our early channel based console driver */
extern struct console dash_console;
#endif
struct machine_desc *machine_desc __initdata;
/*
@ -180,6 +186,15 @@ void __init setup_arch(char **cmdline_p)
metag_cache_probe();
metag_da_probe();
#ifdef CONFIG_DA_CONSOLE
if (metag_da_enabled()) {
/* An early channel based console driver */
register_console(&dash_console);
add_preferred_console("ttyDA", 1, NULL);
}
#endif
/* try interpreting the argument as a device tree */
machine_desc = setup_machine_fdt(original_cmd_line);
/* if it doesn't look like a device tree it must be a command line */