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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2012 Virgil-Adrian Teaca
*
* 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; version 2 of the License.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Driver for serial programmers compatible with SI-Prog or AJAWe.
*
* See http://www.lancos.com/siprogsch.html for SI-Prog schematics and instructions.
* See http://www.ajawe.pl/ajawe0208.htm for AJAWe serial programmer documentation.
*
* Pin layout for SI-Prog-like hardware:
*
* MOSI <-------< DTR
* MISO >-------> CTS
* SCK <---+---< RTS
* +---> DSR
* CS# <-------< TXD
*
* and for the AJAWe serial programmer:
*
* MOSI <-------< DTR
* MISO >-------> CTS
* SCK <-------< RTS
* CS# <-------< TXD
*
* DCE >-------> DSR
*/
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include "flash.h"
#include "programmer.h"
enum pony_type {
TYPE_SI_PROG,
TYPE_SERBANG,
TYPE_AJAWE
};
/* Pins for master->slave direction */
static int pony_negate_cs = 1;
static int pony_negate_sck = 0;
static int pony_negate_mosi = 0;
/* Pins for slave->master direction */
static int pony_negate_miso = 0;
static void pony_bitbang_set_cs(int val)
{
if (pony_negate_cs)
val ^= 1;
sp_set_pin(PIN_TXD, val);
}
static void pony_bitbang_set_sck(int val)
{
if (pony_negate_sck)
val ^= 1;
sp_set_pin(PIN_RTS, val);
}
static void pony_bitbang_set_mosi(int val)
{
if (pony_negate_mosi)
val ^= 1;
sp_set_pin(PIN_DTR, val);
}
static int pony_bitbang_get_miso(void)
{
int tmp = sp_get_pin(PIN_CTS);
if (pony_negate_miso)
tmp ^= 1;
return tmp;
}
static const struct bitbang_spi_master bitbang_spi_master_pony = {
.type = BITBANG_SPI_MASTER_PONY,
.set_cs = pony_bitbang_set_cs,
.set_sck = pony_bitbang_set_sck,
.set_mosi = pony_bitbang_set_mosi,
.get_miso = pony_bitbang_get_miso,
.half_period = 0,
};
static int pony_spi_shutdown(void *data)
{
/* Shut down serial port communication */
int ret = serialport_shutdown(NULL);
if (ret)
msg_pdbg("Pony SPI shutdown failed.\n");
else
msg_pdbg("Pony SPI shutdown completed.\n");
return ret;
}
int pony_spi_init(void)
{
int i, data_out;
char *arg = NULL;
enum pony_type type = TYPE_SI_PROG;
char *name;
int have_device = 0;
int have_prog = 0;
/* The parameter is in format "dev=/dev/device,type=serbang" */
arg = extract_programmer_param("dev");
if (arg && strlen(arg)) {
sp_fd = sp_openserport(arg, 9600);
if (sp_fd == SER_INV_FD) {
free(arg);
return 1;
}
if (register_shutdown(pony_spi_shutdown, NULL) != 0) {
free(arg);
serialport_shutdown(NULL);
return 1;
}
have_device++;
}
free(arg);
if (!have_device) {
msg_perr("Error: No valid device specified.\n"
"Use flashrom -p pony_spi:dev=/dev/device[,type=name]\n");
return 1;
}
arg = extract_programmer_param("type");
if (arg && !strcasecmp(arg, "serbang")) {
type = TYPE_SERBANG;
} else if (arg && !strcasecmp(arg, "si_prog")) {
type = TYPE_SI_PROG;
} else if (arg && !strcasecmp( arg, "ajawe")) {
type = TYPE_AJAWE;
} else if (arg && !strlen(arg)) {
msg_perr("Error: Missing argument for programmer type.\n");
free(arg);
return 1;
} else if (arg){
msg_perr("Error: Invalid programmer type specified.\n");
free(arg);
return 1;
}
free(arg);
/*
* Configure the serial port pins, depending on the used programmer.
*/
switch (type) {
case TYPE_AJAWE:
pony_negate_cs = 1;
pony_negate_sck = 1;
pony_negate_mosi = 1;
pony_negate_miso = 1;
name = "AJAWe";
break;
case TYPE_SERBANG:
pony_negate_cs = 0;
pony_negate_sck = 0;
pony_negate_mosi = 0;
pony_negate_miso = 1;
name = "serbang";
break;
default:
case TYPE_SI_PROG:
pony_negate_cs = 1;
pony_negate_sck = 0;
pony_negate_mosi = 0;
pony_negate_miso = 0;
name = "SI-Prog";
break;
}
msg_pdbg("Using %s programmer pinout.\n", name);
/*
* Detect if there is a compatible hardware programmer connected.
*/
pony_bitbang_set_cs(1);
pony_bitbang_set_sck(1);
pony_bitbang_set_mosi(1);
switch (type) {
case TYPE_AJAWE:
have_prog = 1;
break;
case TYPE_SI_PROG:
case TYPE_SERBANG:
default:
have_prog = 1;
/* We toggle RTS/SCK a few times and see if DSR changes too. */
for (i = 1; i <= 10; i++) {
data_out = i & 1;
sp_set_pin(PIN_RTS, data_out);
programmer_delay(1000);
/* If DSR does not change, we are not connected to what we think */
if (data_out != sp_get_pin(PIN_DSR)) {
have_prog = 0;
break;
}
}
break;
}
if (!have_prog) {
msg_perr("No programmer compatible with %s detected.\n", name);
return 1;
}
if (register_spi_bitbang_master(&bitbang_spi_master_pony)) {
return 1;
}
return 0;
}
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