diff options
Diffstat (limited to 'firmware/microblaze/usrp2p/spif.c')
-rw-r--r-- | firmware/microblaze/usrp2p/spif.c | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/firmware/microblaze/usrp2p/spif.c b/firmware/microblaze/usrp2p/spif.c deleted file mode 100644 index 1c1a348f4..000000000 --- a/firmware/microblaze/usrp2p/spif.c +++ /dev/null @@ -1,68 +0,0 @@ -/* - * Copyright 2007,2008,2009 Free Software Foundation, Inc. - * Copyright 2009 Ettus Research LLC - * - * 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 3 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 <http://www.gnu.org/licenses/>. - */ - -/* - * Code for the Flash SPI bus - */ - -#include "spi.h" -#include "memory_map.h" - -void -spif_init(void) -{ - /* - * f_sclk = f_wb / ((div + 1) * 2) - */ - spif_regs->div = 1; // 0 = Div by 2 (31.25 MHz); 1 = Div-by-4 (15.625 MHz) - - // run dummy transaction to work around invalid initial clock state - spif_transact(SPI_TXONLY, 0, 0, 8, SPIF_PUSH_FALL | SPIF_LATCH_RISE); -} - -inline void -spif_wait(void) -{ - while (spif_regs->ctrl & SPI_CTRL_GO_BSY) - ; -} - -uint32_t -spif_transact(bool readback_, int slave, uint32_t data, int length, uint32_t flags) -{ - flags &= (SPI_CTRL_TXNEG | SPI_CTRL_RXNEG); - int ctrl = SPI_CTRL_ASS | (SPI_CTRL_CHAR_LEN_MASK & length) | flags; - - spif_wait(); - - // Data we will send - spif_regs->txrx0 = data; - - // Run it -- write once and rewrite with GO set - spif_regs->ctrl = ctrl; - // Tell it which SPI slave device to access - spif_regs->ss = slave & 0xff; - spif_regs->ctrl = ctrl | SPI_CTRL_GO_BSY; - - if(readback_) { - spif_wait(); - return spif_regs->txrx0; - } - else - return 0; -} |