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Viewing changes to roms/u-boot/drivers/net/xilinx_ll_temac_fifo.c

  • Committer: Phil Dennis-Jordan
  • Date: 2017-07-21 08:03:43 UTC
  • mfrom: (1.1.1)
  • Revision ID: phil@philjordan.eu-20170721080343-2yr2vdj7713czahv
New upstream release 2.9.0.

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roms/u-boot/drivers/net/xilinx_ll_temac_fifo.c
 
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/*
 
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 * Xilinx xps_ll_temac ethernet driver for u-boot
 
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 *
 
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 * FIFO sub-controller
 
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 *
 
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 * Copyright (C) 2011 - 2012 Stephan Linz <linz@li-pro.net>
 
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 * Copyright (C) 2008 - 2011 Michal Simek <monstr@monstr.eu>
 
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 * Copyright (C) 2008 - 2011 PetaLogix
 
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 *
 
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 * Based on Yoshio Kashiwagi kashiwagi@co-nss.co.jp driver
 
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 * Copyright (C) 2008 Nissin Systems Co.,Ltd.
 
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 * March 2008 created
 
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 *
 
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 * CREDITS: tsec driver
 
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 *
 
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 * SPDX-License-Identifier:     GPL-2.0+
 
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 *
 
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 * [0]: http://www.xilinx.com/support/documentation
 
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 *
 
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 * [F]: [0]/ip_documentation/xps_ll_fifo.pdf
 
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 * [S]: [0]/ip_documentation/xps_ll_temac.pdf
 
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 * [A]: [0]/application_notes/xapp1041.pdf
 
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 */
 
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#include <config.h>
 
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#include <common.h>
 
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#include <net.h>
 
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#include <asm/types.h>
 
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#include <asm/io.h>
 
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#include "xilinx_ll_temac.h"
 
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#include "xilinx_ll_temac_fifo.h"
 
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int ll_temac_reset_fifo(struct eth_device *dev)
 
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{
 
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        struct ll_temac *ll_temac = dev->priv;
 
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        struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr;
 
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        out_be32(&fifo_ctrl->tdfr, LL_FIFO_TDFR_KEY);
 
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        out_be32(&fifo_ctrl->rdfr, LL_FIFO_RDFR_KEY);
 
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        out_be32(&fifo_ctrl->isr, ~0UL);
 
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        out_be32(&fifo_ctrl->ier, 0);
 
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        return 0;
 
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}
 
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int ll_temac_recv_fifo(struct eth_device *dev)
 
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{
 
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        int i, length = 0;
 
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        u32 *buf = (u32 *)NetRxPackets[0];
 
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        struct ll_temac *ll_temac = dev->priv;
 
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        struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr;
 
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        if (in_be32(&fifo_ctrl->isr) & LL_FIFO_ISR_RC) {
 
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                /* reset isr */
 
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                out_be32(&fifo_ctrl->isr, ~0UL);
 
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                /*
 
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                 * MAYBE here:
 
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                 *   while (fifo_ctrl->isr);
 
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                 */
 
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                /*
 
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                 * The length is written (into RLR) by the XPS LL FIFO
 
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                 * when the packet is received across the RX LocalLink
 
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                 * interface and the receive data FIFO had enough
 
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                 * locations that all of the packet data has been saved.
 
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                 * The RLR should only be read when a receive packet is
 
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                 * available for processing (the receive occupancy is
 
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                 * not zero). Once the RLR is read, the receive packet
 
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                 * data should be read from the receive data FIFO before
 
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                 * the RLR is read again.
 
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                 *
 
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                 * [F] page 17, Receive Length Register (RLR)
 
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                 */
 
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                if (in_be32(&fifo_ctrl->rdfo) & LL_FIFO_RDFO_MASK) {
 
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                        length = in_be32(&fifo_ctrl->rlf) & LL_FIFO_RLF_MASK;
 
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                } else {
 
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                        printf("%s: Got error, no receive occupancy\n",
 
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                                        __func__);
 
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                        return -1;
 
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                }
 
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                if (length > PKTSIZE_ALIGN) {
 
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                        printf("%s: Got error, receive package too big (%i)\n",
 
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                                        __func__, length);
 
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                        ll_temac_reset_fifo(dev);
 
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                        return -1;
 
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                }
 
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                for (i = 0; i < length; i += 4)
 
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                        *buf++ = in_be32(&fifo_ctrl->rdfd);
 
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                NetReceive(NetRxPackets[0], length);
 
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        }
 
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        return 0;
 
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}
 
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int ll_temac_send_fifo(struct eth_device *dev, void *packet, int length)
 
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{
 
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        int i;
 
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        u32 *buf = (u32 *)packet;
 
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        struct ll_temac *ll_temac = dev->priv;
 
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        struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr;
 
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        if (length < LL_FIFO_TLF_MIN) {
 
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                printf("%s: Got error, transmit package too small (%i)\n",
 
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                                __func__, length);
 
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                return -1;
 
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        }
 
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        if (length > LL_FIFO_TLF_MAX) {
 
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                printf("%s: Got error, transmit package too big (%i)\n",
 
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                                __func__, length);
 
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                return -1;
 
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        }
 
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        for (i = 0; i < length; i += 4)
 
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                out_be32(&fifo_ctrl->tdfd, *buf++);
 
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        /*
 
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         * Once the packet length is written to the TLR it is
 
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         * automatically moved to the transmit data FIFO with
 
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         * the packet data freeing up the TLR for another value.
 
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         * The packet length must be written to the TLR after
 
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         * the packet data is written to the transmit data FIFO.
 
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         * It is not valid to write data for multiple packets
 
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         * to the transmit data FIFO before writing the packet
 
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         * length values.
 
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         *
 
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         * [F] page 17, Transmit Length Register (TLR)
 
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         */
 
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        out_be32(&fifo_ctrl->tlf, length);
 
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        return 0;
 
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}