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openocd/src/jtag/interfaces.c
Paul Fertser 962b3eb40c Add BCM2835 (as found in Raspberry Pi) interface driver 
This adds support for JTAG programming by bitbanging GPIOs exposed on
the RaspberryPi's expansion header.

Tested by connecting directly to an STM32VLDiscovery board, without any
additional circuity. I observed maximum about 4MHz on the TCK pin with an
old analogue 'scope and about 100kHz when setting the speed to 100kHz.
Busyloop waiting is needed because even with a single 0ns nanosleep call
(with FIFO priority) it lowers the TCK speed to ~30kHz which is way too low
to be useful.

The speed testing with adapter_khz 2000 gave the following results:
sudo chrt -f 1 nice -n -19 ./src/openocd \
     -f interface/raspberrypi-native.cfg \
     -c "set WORKAREASIZE 0x2000" \
     -f target/stm32f1x.cfg -c "adapter_khz 2000"

wrote 131072 bytes from file random.bin in 3.973677s (32.212 KiB/s)
dumped 131072 bytes in 1.445699s (88.538 KiB/s)

This is 3.7 times faster for writing and 14.3 times faster for reading
compared to the generic sysfsgpio driver; probably the writing speed is
limited by the target itself here and reading speed might be considerably
higher too with appropriate connection and a capable target.

BCM2835 name is choosen over BCM2708 because the published peripherals
datasheet uses the particular model name and not family name.

Change-Id: Ib78168be27f53c2a3c88c3dd8154d1190c318c78
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/758
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
2013-06-10 09:39:48 +00:00

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/***************************************************************************
* Copyright (C) 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2007,2008 Øyvind Harboe *
* oyvind.harboe@zylin.com *
* *
* Copyright (C) 2009 SoftPLC Corporation *
* http://softplc.com *
* dick@softplc.com *
* *
* Copyright (C) 2009 Zachary T Welch *
* zw@superlucidity.net *
* *
* 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. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "interfaces.h"
/** @file
* This file includes declarations for all built-in jtag interfaces,
* which are then listed in the jtag_interfaces array.
*
* Dynamic loading can be implemented be searching for shared libraries
* that contain a jtag_interface structure that can added to this list.
*/
#if BUILD_ZY1000 == 1
extern struct jtag_interface zy1000_interface;
#elif defined(BUILD_MINIDRIVER_DUMMY)
extern struct jtag_interface minidummy_interface;
#else /* standard drivers */
#if BUILD_PARPORT == 1
extern struct jtag_interface parport_interface;
#endif
#if BUILD_DUMMY == 1
extern struct jtag_interface dummy_interface;
#endif
#if BUILD_FT2232_FTD2XX == 1
extern struct jtag_interface ft2232_interface;
#endif
#if BUILD_FT2232_LIBFTDI == 1
extern struct jtag_interface ft2232_interface;
#endif
#if BUILD_FTDI == 1
extern struct jtag_interface ftdi_interface;
#endif
#if BUILD_USB_BLASTER_LIBFTDI == 1 || BUILD_USB_BLASTER_FTD2XX == 1
extern struct jtag_interface usb_blaster_interface;
#endif
#if BUILD_AMTJTAGACCEL == 1
extern struct jtag_interface amt_jtagaccel_interface;
#endif
#if BUILD_EP93XX == 1
extern struct jtag_interface ep93xx_interface;
#endif
#if BUILD_AT91RM9200 == 1
extern struct jtag_interface at91rm9200_interface;
#endif
#if BUILD_GW16012 == 1
extern struct jtag_interface gw16012_interface;
#endif
#if BUILD_PRESTO_LIBFTDI == 1 || BUILD_PRESTO_FTD2XX == 1
extern struct jtag_interface presto_interface;
#endif
#if BUILD_USBPROG == 1
extern struct jtag_interface usbprog_interface;
#endif
#if BUILD_OPENJTAG == 1
extern struct jtag_interface openjtag_interface;
#endif
#if BUILD_JLINK == 1
extern struct jtag_interface jlink_interface;
#endif
#if BUILD_VSLLINK == 1
extern struct jtag_interface vsllink_interface;
#endif
#if BUILD_RLINK == 1
extern struct jtag_interface rlink_interface;
#endif
#if BUILD_ULINK == 1
extern struct jtag_interface ulink_interface;
#endif
#if BUILD_ARMJTAGEW == 1
extern struct jtag_interface armjtagew_interface;
#endif
#if BUILD_BUSPIRATE == 1
extern struct jtag_interface buspirate_interface;
#endif
#if BUILD_REMOTE_BITBANG == 1
extern struct jtag_interface remote_bitbang_interface;
#endif
#if BUILD_HLADAPTER == 1
extern struct jtag_interface hl_interface;
#endif
#if BUILD_OSBDM == 1
extern struct jtag_interface osbdm_interface;
#endif
#if BUILD_OPENDOUS == 1
extern struct jtag_interface opendous_interface;
#endif
#if BUILD_SYSFSGPIO == 1
extern struct jtag_interface sysfsgpio_interface;
#endif
#if BUILD_AICE == 1
extern struct jtag_interface aice_interface;
#endif
#if BUILD_BCM2835GPIO == 1
extern struct jtag_interface bcm2835gpio_interface;
#endif
#endif /* standard drivers */
/**
* The list of built-in JTAG interfaces, containing entries for those
* drivers that were enabled by the @c configure script.
*
* The list should be defined to contain either one minidriver interface
* or some number of standard driver interfaces, never both.
*/
struct jtag_interface *jtag_interfaces[] = {
#if BUILD_ZY1000 == 1
&zy1000_interface,
#elif defined(BUILD_MINIDRIVER_DUMMY)
&minidummy_interface,
#else /* standard drivers */
#if BUILD_PARPORT == 1
&parport_interface,
#endif
#if BUILD_DUMMY == 1
&dummy_interface,
#endif
#if BUILD_FT2232_FTD2XX == 1
&ft2232_interface,
#endif
#if BUILD_FT2232_LIBFTDI == 1
&ft2232_interface,
#endif
#if BUILD_FTDI == 1
&ftdi_interface,
#endif
#if BUILD_USB_BLASTER_LIBFTDI == 1 || BUILD_USB_BLASTER_FTD2XX == 1
&usb_blaster_interface,
#endif
#if BUILD_AMTJTAGACCEL == 1
&amt_jtagaccel_interface,
#endif
#if BUILD_EP93XX == 1
&ep93xx_interface,
#endif
#if BUILD_AT91RM9200 == 1
&at91rm9200_interface,
#endif
#if BUILD_GW16012 == 1
&gw16012_interface,
#endif
#if BUILD_PRESTO_LIBFTDI == 1 || BUILD_PRESTO_FTD2XX == 1
&presto_interface,
#endif
#if BUILD_USBPROG == 1
&usbprog_interface,
#endif
#if BUILD_OPENJTAG == 1
&openjtag_interface,
#endif
#if BUILD_JLINK == 1
&jlink_interface,
#endif
#if BUILD_VSLLINK == 1
&vsllink_interface,
#endif
#if BUILD_RLINK == 1
&rlink_interface,
#endif
#if BUILD_ULINK == 1
&ulink_interface,
#endif
#if BUILD_ARMJTAGEW == 1
&armjtagew_interface,
#endif
#if BUILD_BUSPIRATE == 1
&buspirate_interface,
#endif
#if BUILD_REMOTE_BITBANG == 1
&remote_bitbang_interface,
#endif
#if BUILD_HLADAPTER == 1
&hl_interface,
#endif
#if BUILD_OSBDM == 1
&osbdm_interface,
#endif
#if BUILD_OPENDOUS == 1
&opendous_interface,
#endif
#if BUILD_SYSFSGPIO == 1
&sysfsgpio_interface,
#endif
#if BUILD_AICE == 1
&aice_interface,
#endif
#if BUILD_BCM2835GPIO == 1
&bcm2835gpio_interface,
#endif
#endif /* standard drivers */
NULL,
};
void jtag_interface_modules_load(const char *path)
{
/* @todo: implement dynamic module loading for JTAG interface drivers */
}
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