diff options
Diffstat (limited to 'drivers/net/xilinx_ll_temac_fifo.c')
| -rw-r--r-- | drivers/net/xilinx_ll_temac_fifo.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/net/xilinx_ll_temac_fifo.c b/drivers/net/xilinx_ll_temac_fifo.c new file mode 100644 index 000000000..3ff0f347e --- /dev/null +++ b/drivers/net/xilinx_ll_temac_fifo.c @@ -0,0 +1,143 @@ +/* + * Xilinx xps_ll_temac ethernet driver for u-boot + * + * FIFO sub-controller + * + * Copyright (C) 2011 - 2012 Stephan Linz <linz@li-pro.net> + * Copyright (C) 2008 - 2011 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008 - 2011 PetaLogix + * + * Based on Yoshio Kashiwagi kashiwagi@co-nss.co.jp driver + * Copyright (C) 2008 Nissin Systems Co.,Ltd. + * March 2008 created + * + * CREDITS: tsec driver + * + * 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 (at your + * option) any later version. + * + * [0]: http://www.xilinx.com/support/documentation + * + * [F]: [0]/ip_documentation/xps_ll_fifo.pdf + * [S]: [0]/ip_documentation/xps_ll_temac.pdf + * [A]: [0]/application_notes/xapp1041.pdf + */ + +#include <config.h> +#include <common.h> +#include <net.h> + +#include <asm/types.h> +#include <asm/io.h> + +#include "xilinx_ll_temac.h" +#include "xilinx_ll_temac_fifo.h" + +int ll_temac_reset_fifo(struct eth_device *dev) +{ + struct ll_temac *ll_temac = dev->priv; + struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; + + out_be32(&fifo_ctrl->tdfr, LL_FIFO_TDFR_KEY); + out_be32(&fifo_ctrl->rdfr, LL_FIFO_RDFR_KEY); + out_be32(&fifo_ctrl->isr, ~0UL); + out_be32(&fifo_ctrl->ier, 0); + + return 0; +} + +int ll_temac_recv_fifo(struct eth_device *dev) +{ + int i, length = 0; + u32 *buf = (u32 *)NetRxPackets[0]; + struct ll_temac *ll_temac = dev->priv; + struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; + + if (in_be32(&fifo_ctrl->isr) & LL_FIFO_ISR_RC) { + + /* reset isr */ + out_be32(&fifo_ctrl->isr, ~0UL); + + /* + * MAYBE here: + * while (fifo_ctrl->isr); + */ + + /* + * The length is written (into RLR) by the XPS LL FIFO + * when the packet is received across the RX LocalLink + * interface and the receive data FIFO had enough + * locations that all of the packet data has been saved. + * The RLR should only be read when a receive packet is + * available for processing (the receive occupancy is + * not zero). Once the RLR is read, the receive packet + * data should be read from the receive data FIFO before + * the RLR is read again. + * + * [F] page 17, Receive Length Register (RLR) + */ + if (in_be32(&fifo_ctrl->rdfo) & LL_FIFO_RDFO_MASK) { + length = in_be32(&fifo_ctrl->rlf) & LL_FIFO_RLF_MASK; + } else { + printf("%s: Got error, no receive occupancy\n", + __func__); + return -1; + } + + if (length > PKTSIZE_ALIGN) { + printf("%s: Got error, receive package too big (%i)\n", + __func__, length); + ll_temac_reset_fifo(dev); + return -1; + } + + for (i = 0; i < length; i += 4) + *buf++ = in_be32(&fifo_ctrl->rdfd); + + NetReceive(NetRxPackets[0], length); + } + + return 0; +} + +int ll_temac_send_fifo(struct eth_device *dev, volatile void *packet, + int length) +{ + int i; + u32 *buf = (u32 *)packet; + struct ll_temac *ll_temac = dev->priv; + struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; + + if (length < LL_FIFO_TLF_MIN) { + printf("%s: Got error, transmit package too small (%i)\n", + __func__, length); + return -1; + } + + if (length > LL_FIFO_TLF_MAX) { + printf("%s: Got error, transmit package too big (%i)\n", + __func__, length); + return -1; + } + + for (i = 0; i < length; i += 4) + out_be32(&fifo_ctrl->tdfd, *buf++); + + /* + * Once the packet length is written to the TLR it is + * automatically moved to the transmit data FIFO with + * the packet data freeing up the TLR for another value. + * The packet length must be written to the TLR after + * the packet data is written to the transmit data FIFO. + * It is not valid to write data for multiple packets + * to the transmit data FIFO before writing the packet + * length values. + * + * [F] page 17, Transmit Length Register (TLR) + */ + out_be32(&fifo_ctrl->tlf, length); + + return 0; +} |