diff options
Diffstat (limited to 'qemu/roms/ipxe/src/drivers/nvs/threewire.c')
-rw-r--r-- | qemu/roms/ipxe/src/drivers/nvs/threewire.c | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/qemu/roms/ipxe/src/drivers/nvs/threewire.c b/qemu/roms/ipxe/src/drivers/nvs/threewire.c deleted file mode 100644 index 547f35382..000000000 --- a/qemu/roms/ipxe/src/drivers/nvs/threewire.c +++ /dev/null @@ -1,136 +0,0 @@ -/* - * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>. - * - * 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 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. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -#include <stddef.h> -#include <string.h> -#include <assert.h> -#include <unistd.h> -#include <ipxe/threewire.h> - -/** @file - * - * Three-wire serial devices - * - */ - -/** - * Read data from three-wire device - * - * @v nvs NVS device - * @v address Address from which to read - * @v data Data buffer - * @v len Length of data buffer - * @ret rc Return status code - */ -int threewire_read ( struct nvs_device *nvs, unsigned int address, - void *data, size_t len ) { - struct spi_device *device = nvs_to_spi ( nvs ); - struct spi_bus *bus = device->bus; - int rc; - - assert ( bus->mode == SPI_MODE_THREEWIRE ); - - DBGC ( device, "3wire %p reading %zd bytes at %04x\n", - device, len, address ); - - if ( ( rc = bus->rw ( bus, device, THREEWIRE_READ, address, - NULL, data, len ) ) != 0 ) { - DBGC ( device, "3wire %p could not read: %s\n", - device, strerror ( rc ) ); - return rc; - } - - return 0; -} - -/** - * Write data to three-wire device - * - * @v nvs NVS device - * @v address Address from which to read - * @v data Data buffer - * @v len Length of data buffer - * @ret rc Return status code - */ -int threewire_write ( struct nvs_device *nvs, unsigned int address, - const void *data, size_t len ) { - struct spi_device *device = nvs_to_spi ( nvs ); - struct spi_bus *bus = device->bus; - int rc; - - assert ( bus->mode == SPI_MODE_THREEWIRE ); - - DBGC ( device, "3wire %p writing %zd bytes at %04x\n", - device, len, address ); - - /* Enable device for writing */ - if ( ( rc = bus->rw ( bus, device, THREEWIRE_EWEN, - THREEWIRE_EWEN_ADDRESS, NULL, NULL, 0 ) ) != 0 ){ - DBGC ( device, "3wire %p could not enable writing: %s\n", - device, strerror ( rc ) ); - return rc; - } - - /* Write data */ - if ( ( rc = bus->rw ( bus, device, THREEWIRE_WRITE, address, - data, NULL, len ) ) != 0 ) { - DBGC ( device, "3wire %p could not write: %s\n", - device, strerror ( rc ) ); - return rc; - } - - /* Our model of an SPI bus doesn't provide a mechanism for - * "assert CS, wait for MISO to become high, so just wait for - * long enough to ensure that the write has completed. - */ - mdelay ( THREEWIRE_WRITE_MDELAY ); - - return 0; -} - -/** - * Autodetect device address length - * - * @v device SPI device - * @ret rc Return status code - */ -int threewire_detect_address_len ( struct spi_device *device ) { - struct nvs_device *nvs = &device->nvs; - int rc; - - DBGC ( device, "3wire %p autodetecting address length\n", device ); - - device->address_len = SPI_AUTODETECT_ADDRESS_LEN; - if ( ( rc = threewire_read ( nvs, 0, NULL, - ( 1 << nvs->word_len_log2 ) ) ) != 0 ) { - DBGC ( device, "3wire %p could not autodetect address " - "length: %s\n", device, strerror ( rc ) ); - return rc; - } - - DBGC ( device, "3wire %p autodetected address length %d\n", - device, device->address_len ); - return 0; -} |