diff options
Diffstat (limited to 'qemu/roms/ipxe/src/drivers/nvs/spi.c')
-rw-r--r-- | qemu/roms/ipxe/src/drivers/nvs/spi.c | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/qemu/roms/ipxe/src/drivers/nvs/spi.c b/qemu/roms/ipxe/src/drivers/nvs/spi.c deleted file mode 100644 index dcfe1af91..000000000 --- a/qemu/roms/ipxe/src/drivers/nvs/spi.c +++ /dev/null @@ -1,145 +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 <errno.h> -#include <unistd.h> -#include <ipxe/spi.h> - -/** @file - * - * SPI devices - * - */ - -/** - * Munge SPI device address into command - * - * @v command SPI command - * @v address Address - * @v munge_address Device requires address munging - * @ret command Actual SPI command to use - * - * Some devices with 9-bit addresses (e.g. AT25040A EEPROM) use bit 3 - * of the command byte as address bit A8, rather than having a - * two-byte address. This function takes care of generating the - * appropriate command. - */ -static inline unsigned int spi_command ( unsigned int command, - unsigned int address, - int munge_address ) { - return ( command | ( ( ( address >> 8 ) & munge_address ) << 3 ) ); -} - -/** - * Wait for SPI device to complete operation - * - * @v device SPI device - * @ret rc Return status code - */ -static int spi_wait ( struct spi_device *device ) { - struct spi_bus *bus = device->bus; - uint8_t status; - int i; - int rc; - - for ( i = 0 ; i < 50 ; i++ ) { - udelay ( 20 ); - if ( ( rc = bus->rw ( bus, device, SPI_RDSR, -1, NULL, - &status, sizeof ( status ) ) ) != 0 ) - return rc; - if ( ! ( status & SPI_STATUS_NRDY ) ) - return 0; - } - DBG ( "SPI %p timed out\n", device ); - return -ETIMEDOUT; -} - -/** - * Read data from SPI 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 spi_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; - unsigned int command = spi_command ( SPI_READ, address, - device->munge_address ); - int rc; - - DBG ( "SPI %p reading %zd bytes from %#04x\n", device, len, address ); - if ( ( rc = bus->rw ( bus, device, command, address, - NULL, data, len ) ) != 0 ) { - DBG ( "SPI %p failed to read data from device\n", device ); - return rc; - } - - return 0; -} - -/** - * Write data to SPI 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 spi_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; - unsigned int command = spi_command ( SPI_WRITE, address, - device->munge_address ); - int rc; - - DBG ( "SPI %p writing %zd bytes to %#04x\n", device, len, address ); - - if ( ( rc = bus->rw ( bus, device, SPI_WREN, -1, - NULL, NULL, 0 ) ) != 0 ) { - DBG ( "SPI %p failed to write-enable device\n", device ); - return rc; - } - - if ( ( rc = bus->rw ( bus, device, command, address, - data, NULL, len ) ) != 0 ) { - DBG ( "SPI %p failed to write data to device\n", device ); - return rc; - } - - if ( ( rc = spi_wait ( device ) ) != 0 ) { - DBG ( "SPI %p failed to complete write operation\n", device ); - return rc; - } - - return 0; -} - |