From da7c545b06195185e9df9a88ef6437c61d64a225 Mon Sep 17 00:00:00 2001 From: Virgil-Adrian Teaca Date: Mon, 30 Apr 2012 23:11:06 +0000 Subject: Add serial port bitbanging code This adds the pony_spi driver which supports the SI_Prog adapter, which is commonly used for SPI chips with PonyProg 2000, and a custom adapter called "SERBANG" which differs in the logic of two pins. Corresponding to flashrom svn r1525. Signed-off-by: Virgil-Adrian Teaca Acked-by: Michael Karcher --- pony_spi.c | 160 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 160 insertions(+) create mode 100644 pony_spi.c (limited to 'pony_spi.c') diff --git a/pony_spi.c b/pony_spi.c new file mode 100644 index 0000000..b5dfc2f --- /dev/null +++ b/pony_spi.c @@ -0,0 +1,160 @@ +/* + * 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 the SI-Prog like hardware by Lancos.com. + * See http://www.lancos.com/siprogsch.html for schematics and instructions. + */ + +#include +#include + +#include "flash.h" +#include "programmer.h" + +/* We have: + + MOSI -----> DTR + MISO -----> CTS + SCK --+--> RTS + +--> DSR + CS# -----> TXD + +*/ + +enum pony_type { + TYPE_SI_PROG, + TYPE_SERBANG, +}; + +/* The hardware programmer used. */ +static enum pony_type pony_type = TYPE_SI_PROG; + +static void pony_bitbang_set_cs(int val) +{ + if (pony_type == TYPE_SI_PROG) + { + /* CS# is negated by the SI-Prog programmer. */ + val ^= 1; + } + sp_set_pin(PIN_TXD, val); +} + +static void pony_bitbang_set_sck(int val) +{ + sp_set_pin(PIN_RTS, val); +} + +static void pony_bitbang_set_mosi(int val) +{ + sp_set_pin(PIN_DTR, val); +} + +static int pony_bitbang_get_miso(void) +{ + int tmp; + + tmp = sp_get_pin(PIN_CTS); + + if (pony_type == TYPE_SERBANG) + { + /* MISO is negated by the SERBANG programmer. */ + 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, +}; + +int pony_spi_init(void) +{ + char *arg = NULL; + int i, data_in, data_out, have_device = 0; + int have_prog = 1; + + /* The parameter is on format "dev=/dev/device,type=serbang" */ + arg = extract_programmer_param("dev"); + + if (arg && strlen(arg)) { + sp_fd = sp_openserport( arg, 9600 ); + have_device++; + } + free(arg); + + if (!have_device) { + msg_perr("Error: No valid device specified.\n" + "Use flashrom -p pony_spi:dev=/dev/device\n"); + + return 1; + } + /* Register the shutdown callback. */ + if (register_shutdown(serialport_shutdown, NULL)) { + return 1; + } + arg = extract_programmer_param("type"); + + if (arg) { + if (!strcasecmp( arg, "serbang")) { + pony_type = TYPE_SERBANG; + } else if (!strcasecmp( arg, "si_prog") ) { + pony_type = TYPE_SI_PROG; + } else { + msg_perr("Error: Invalid programmer type specified.\n"); + free(arg); + return 1; + } + } + free(arg); + + msg_pdbg("Using the %s programmer.\n", ((pony_type == TYPE_SI_PROG ) ? "SI-Prog" : "SERBANG")); + /* + * Detect if there is a SI-Prog compatible programmer connected. + */ + pony_bitbang_set_cs(1); + pony_bitbang_set_mosi(1); + + /* We toggle SCK while we keep MOSI and CS# on. */ + for (i = 1; i <= 10; ++i) { + data_out = i & 1; + sp_set_pin(PIN_RTS, data_out); + programmer_delay( 1000 ); + data_in = sp_get_pin(PIN_DSR); + + if (data_out != data_in) { + have_prog = 0; + break; + } + } + + if (!have_prog) { + msg_perr( "No SI-Prog compatible hardware detected.\n" ); + return 1; + } + + if (bitbang_spi_init(&bitbang_spi_master_pony)) { + return 1; + } + return 0; +} -- cgit v1.1