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openocd/src/jtag/drivers/at91rm9200.c
Tim Newsome 64f1f7b1c1 Add read buffer to bitbang, improving performance. 
Previously for every bit scanned OpenOCD would write the bit, wait for
that bit to be scanned, and then read the result. This involves at least
2 context switches. Most of the time the next bit scanned does not
depend on the last bit we read, so with a buffer we now write a bunch of
bits to be scanned all at once, and then we wait for them all to be
scanned and have a result.

This reduces the time for one testcase where OpenOCD connects to a
simulator from 12.30s to 5.35s!

Running all our tests went from 13m13s to 3m55s.

Change-Id: Ie9fcea043ac1d7877a521125334ed47d4b3e1615
Signed-off-by: Tim Newsome <tim@sifive.com>
Reviewed-on: http://openocd.zylin.com/4312
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
2018-01-25 16:44:06 +00:00

271 lines
7.7 KiB
C
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/***************************************************************************
* Copyright (C) 2006 by Anders Larsen *
* al@alarsen.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, see <http://www.gnu.org/licenses/>. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <jtag/interface.h>
#include "bitbang.h"
#include <sys/mman.h>
/* AT91RM9200 */
#define AT91C_BASE_SYS (0xfffff000)
/* GPIO assignment */
#define PIOA (0 << 7)
#define PIOB (1 << 7)
#define PIOC (2 << 7)
#define PIOD (3 << 7)
#define PIO_PER (0) /* PIO enable */
#define PIO_OER (4) /* output enable */
#define PIO_ODR (5) /* output disable */
#define PIO_SODR (12) /* set output data */
#define PIO_CODR (13) /* clear output data */
#define PIO_PDSR (15) /* pin data status */
#define PIO_PPUER (25) /* pull-up enable */
#define NC (0) /* not connected */
#define P0 (1 << 0)
#define P1 (1 << 1)
#define P2 (1 << 2)
#define P3 (1 << 3)
#define P4 (1 << 4)
#define P5 (1 << 5)
#define P6 (1 << 6)
#define P7 (1 << 7)
#define P8 (1 << 8)
#define P9 (1 << 9)
#define P10 (1 << 10)
#define P11 (1 << 11)
#define P12 (1 << 12)
#define P13 (1 << 13)
#define P14 (1 << 14)
#define P15 (1 << 15)
#define P16 (1 << 16)
#define P17 (1 << 17)
#define P18 (1 << 18)
#define P19 (1 << 19)
#define P20 (1 << 20)
#define P21 (1 << 21)
#define P22 (1 << 22)
#define P23 (1 << 23)
#define P24 (1 << 24)
#define P25 (1 << 25)
#define P26 (1 << 26)
#define P27 (1 << 27)
#define P28 (1 << 28)
#define P29 (1 << 29)
#define P30 (1 << 30)
#define P31 (1 << 31)
struct device_t {
const char *name;
int TDO_PIO; /* PIO holding TDO */
uint32_t TDO_MASK; /* TDO bitmask */
int TRST_PIO; /* PIO holding TRST */
uint32_t TRST_MASK; /* TRST bitmask */
int TMS_PIO; /* PIO holding TMS */
uint32_t TMS_MASK; /* TMS bitmask */
int TCK_PIO; /* PIO holding TCK */
uint32_t TCK_MASK; /* TCK bitmask */
int TDI_PIO; /* PIO holding TDI */
uint32_t TDI_MASK; /* TDI bitmask */
int SRST_PIO; /* PIO holding SRST */
uint32_t SRST_MASK; /* SRST bitmask */
};
static const struct device_t devices[] = {
{ "rea_ecr", PIOD, P27, PIOA, NC, PIOD, P23, PIOD, P24, PIOD, P26, PIOC, P5 },
{ .name = NULL },
};
/* configuration */
static char *at91rm9200_device;
/* interface variables
*/
static const struct device_t *device;
static int dev_mem_fd;
static void *sys_controller;
static uint32_t *pio_base;
/* low level command set
*/
static bb_value_t at91rm9200_read(void);
static int at91rm9200_write(int tck, int tms, int tdi);
static int at91rm9200_reset(int trst, int srst);
static int at91rm9200_init(void);
static int at91rm9200_quit(void);
static struct bitbang_interface at91rm9200_bitbang = {
.read = at91rm9200_read,
.write = at91rm9200_write,
.reset = at91rm9200_reset,
.blink = 0
};
static bb_value_t at91rm9200_read(void)
{
return (pio_base[device->TDO_PIO + PIO_PDSR] & device->TDO_MASK) ? BB_HIGH : BB_LOW;
}
static int at91rm9200_write(int tck, int tms, int tdi)
{
if (tck)
pio_base[device->TCK_PIO + PIO_SODR] = device->TCK_MASK;
else
pio_base[device->TCK_PIO + PIO_CODR] = device->TCK_MASK;
if (tms)
pio_base[device->TMS_PIO + PIO_SODR] = device->TMS_MASK;
else
pio_base[device->TMS_PIO + PIO_CODR] = device->TMS_MASK;
if (tdi)
pio_base[device->TDI_PIO + PIO_SODR] = device->TDI_MASK;
else
pio_base[device->TDI_PIO + PIO_CODR] = device->TDI_MASK;
return ERROR_OK;
}
/* (1) assert or (0) deassert reset lines */
static int at91rm9200_reset(int trst, int srst)
{
if (trst == 0)
pio_base[device->TRST_PIO + PIO_SODR] = device->TRST_MASK;
else if (trst == 1)
pio_base[device->TRST_PIO + PIO_CODR] = device->TRST_MASK;
if (srst == 0)
pio_base[device->SRST_PIO + PIO_SODR] = device->SRST_MASK;
else if (srst == 1)
pio_base[device->SRST_PIO + PIO_CODR] = device->SRST_MASK;
return ERROR_OK;
}
COMMAND_HANDLER(at91rm9200_handle_device_command)
{
if (CMD_ARGC == 0)
return ERROR_COMMAND_SYNTAX_ERROR;
/* only if the device name wasn't overwritten by cmdline */
if (at91rm9200_device == 0) {
at91rm9200_device = malloc(strlen(CMD_ARGV[0]) + sizeof(char));
strcpy(at91rm9200_device, CMD_ARGV[0]);
}
return ERROR_OK;
}
static const struct command_registration at91rm9200_command_handlers[] = {
{
.name = "at91rm9200_device",
.handler = &at91rm9200_handle_device_command,
.mode = COMMAND_CONFIG,
.help = "query armjtagew info",
},
COMMAND_REGISTRATION_DONE
};
struct jtag_interface at91rm9200_interface = {
.name = "at91rm9200",
.execute_queue = bitbang_execute_queue,
.commands = at91rm9200_command_handlers,
.init = at91rm9200_init,
.quit = at91rm9200_quit,
};
static int at91rm9200_init(void)
{
const struct device_t *cur_device;
cur_device = devices;
if (at91rm9200_device == NULL || at91rm9200_device[0] == 0) {
at91rm9200_device = "rea_ecr";
LOG_WARNING("No at91rm9200 device specified, using default 'rea_ecr'");
}
while (cur_device->name) {
if (strcmp(cur_device->name, at91rm9200_device) == 0) {
device = cur_device;
break;
}
cur_device++;
}
if (!device) {
LOG_ERROR("No matching device found for %s", at91rm9200_device);
return ERROR_JTAG_INIT_FAILED;
}
bitbang_interface = &at91rm9200_bitbang;
dev_mem_fd = open("/dev/mem", O_RDWR | O_SYNC);
if (dev_mem_fd < 0) {
perror("open");
return ERROR_JTAG_INIT_FAILED;
}
sys_controller = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
MAP_SHARED, dev_mem_fd, AT91C_BASE_SYS);
if (sys_controller == MAP_FAILED) {
perror("mmap");
close(dev_mem_fd);
return ERROR_JTAG_INIT_FAILED;
}
pio_base = (uint32_t *)sys_controller + 0x100;
/*
* Configure TDO as an input, and TDI, TCK, TMS, TRST, SRST
* as outputs. Drive TDI and TCK low, and TMS/TRST/SRST high.
*/
pio_base[device->TDI_PIO + PIO_CODR] = device->TDI_MASK;
pio_base[device->TDI_PIO + PIO_OER] = device->TDI_MASK;
pio_base[device->TDI_PIO + PIO_PER] = device->TDI_MASK;
pio_base[device->TCK_PIO + PIO_CODR] = device->TCK_MASK;
pio_base[device->TCK_PIO + PIO_OER] = device->TCK_MASK;
pio_base[device->TCK_PIO + PIO_PER] = device->TCK_MASK;
pio_base[device->TMS_PIO + PIO_SODR] = device->TMS_MASK;
pio_base[device->TMS_PIO + PIO_OER] = device->TMS_MASK;
pio_base[device->TMS_PIO + PIO_PER] = device->TMS_MASK;
pio_base[device->TRST_PIO + PIO_SODR] = device->TRST_MASK;
pio_base[device->TRST_PIO + PIO_OER] = device->TRST_MASK;
pio_base[device->TRST_PIO + PIO_PER] = device->TRST_MASK;
pio_base[device->SRST_PIO + PIO_SODR] = device->SRST_MASK;
pio_base[device->SRST_PIO + PIO_OER] = device->SRST_MASK;
pio_base[device->SRST_PIO + PIO_PER] = device->SRST_MASK;
pio_base[device->TDO_PIO + PIO_ODR] = device->TDO_MASK;
pio_base[device->TDO_PIO + PIO_PPUER] = device->TDO_MASK;
pio_base[device->TDO_PIO + PIO_PER] = device->TDO_MASK;
return ERROR_OK;
}
static int at91rm9200_quit(void)
{
return ERROR_OK;
}
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