/***************************************************************************
* Copyright (C) 2013 by Paul Fertser, fercerpav@gmail.com *
* *
* Copyright (C) 2012 by Creative Product Design, marc @ cpdesign.com.au *
* Based on at91rm9200.c (c) Anders Larsen *
* and RPi GPIO examples by Gert van Loo & Dom *
* *
* 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 . *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include
#include
#include "bitbang.h"
#include
uint32_t bcm2835_peri_base = 0x20000000;
#define BCM2835_GPIO_BASE (bcm2835_peri_base + 0x200000) /* GPIO controller */
#define BCM2835_PADS_GPIO_0_27 (bcm2835_peri_base + 0x100000)
#define BCM2835_PADS_GPIO_0_27_OFFSET (0x2c / 4)
/* GPIO setup macros */
#define MODE_GPIO(g) (*(pio_base+((g)/10))>>(((g)%10)*3) & 7)
#define INP_GPIO(g) do { *(pio_base+((g)/10)) &= ~(7<<(((g)%10)*3)); } while (0)
#define SET_MODE_GPIO(g, m) do { /* clear the mode bits first, then set as necessary */ \
INP_GPIO(g); \
*(pio_base+((g)/10)) |= ((m)<<(((g)%10)*3)); } while (0)
#define OUT_GPIO(g) SET_MODE_GPIO(g, 1)
#define GPIO_SET (*(pio_base+7)) /* sets bits which are 1, ignores bits which are 0 */
#define GPIO_CLR (*(pio_base+10)) /* clears bits which are 1, ignores bits which are 0 */
#define GPIO_LEV (*(pio_base+13)) /* current level of the pin */
static int dev_mem_fd;
static volatile uint32_t *pio_base;
static bb_value_t bcm2835gpio_read(void);
static int bcm2835gpio_write(int tck, int tms, int tdi);
static int bcm2835_swdio_read(void);
static void bcm2835_swdio_drive(bool is_output);
static int bcm2835gpio_swd_write(int swclk, int swdio);
static int bcm2835gpio_init(void);
static int bcm2835gpio_quit(void);
static struct bitbang_interface bcm2835gpio_bitbang = {
.read = bcm2835gpio_read,
.write = bcm2835gpio_write,
.swdio_read = bcm2835_swdio_read,
.swdio_drive = bcm2835_swdio_drive,
.swd_write = bcm2835gpio_swd_write,
.blink = NULL
};
/* GPIO numbers for each signal. Negative values are invalid */
static int tck_gpio = -1;
static int tck_gpio_mode;
static int tms_gpio = -1;
static int tms_gpio_mode;
static int tdi_gpio = -1;
static int tdi_gpio_mode;
static int tdo_gpio = -1;
static int tdo_gpio_mode;
static int trst_gpio = -1;
static int trst_gpio_mode;
static int srst_gpio = -1;
static int srst_gpio_mode;
static int swclk_gpio = -1;
static int swclk_gpio_mode;
static int swdio_gpio = -1;
static int swdio_gpio_mode;
static int swdio_dir_gpio = -1;
static int swdio_dir_gpio_mode;
/* Transition delay coefficients */
static int speed_coeff = 113714;
static int speed_offset = 28;
static unsigned int jtag_delay;
static int is_gpio_valid(int gpio)
{
return gpio >= 0 && gpio <= 31;
}
static bb_value_t bcm2835gpio_read(void)
{
return (GPIO_LEV & 1<