1 /* 2 * Xilinx xps_ll_temac ethernet driver for u-boot 3 * 4 * FIFO sub-controller 5 * 6 * Copyright (C) 2011 - 2012 Stephan Linz <linz@li-pro.net> 7 * Copyright (C) 2008 - 2011 Michal Simek <monstr@monstr.eu> 8 * Copyright (C) 2008 - 2011 PetaLogix 9 * 10 * Based on Yoshio Kashiwagi kashiwagi@co-nss.co.jp driver 11 * Copyright (C) 2008 Nissin Systems Co.,Ltd. 12 * March 2008 created 13 * 14 * CREDITS: tsec driver 15 * 16 * This program is free software; you can redistribute it and/or modify it 17 * under the terms of the GNU General Public License as published by the 18 * Free Software Foundation; either version 2 of the License, or (at your 19 * option) any later version. 20 * 21 * [0]: http://www.xilinx.com/support/documentation 22 * 23 * [F]: [0]/ip_documentation/xps_ll_fifo.pdf 24 * [S]: [0]/ip_documentation/xps_ll_temac.pdf 25 * [A]: [0]/application_notes/xapp1041.pdf 26 */ 27 28 #include <config.h> 29 #include <common.h> 30 #include <net.h> 31 32 #include <asm/types.h> 33 #include <asm/io.h> 34 35 #include "xilinx_ll_temac.h" 36 #include "xilinx_ll_temac_fifo.h" 37 38 int ll_temac_reset_fifo(struct eth_device *dev) 39 { 40 struct ll_temac *ll_temac = dev->priv; 41 struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; 42 43 out_be32(&fifo_ctrl->tdfr, LL_FIFO_TDFR_KEY); 44 out_be32(&fifo_ctrl->rdfr, LL_FIFO_RDFR_KEY); 45 out_be32(&fifo_ctrl->isr, ~0UL); 46 out_be32(&fifo_ctrl->ier, 0); 47 48 return 0; 49 } 50 51 int ll_temac_recv_fifo(struct eth_device *dev) 52 { 53 int i, length = 0; 54 u32 *buf = (u32 *)NetRxPackets[0]; 55 struct ll_temac *ll_temac = dev->priv; 56 struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; 57 58 if (in_be32(&fifo_ctrl->isr) & LL_FIFO_ISR_RC) { 59 60 /* reset isr */ 61 out_be32(&fifo_ctrl->isr, ~0UL); 62 63 /* 64 * MAYBE here: 65 * while (fifo_ctrl->isr); 66 */ 67 68 /* 69 * The length is written (into RLR) by the XPS LL FIFO 70 * when the packet is received across the RX LocalLink 71 * interface and the receive data FIFO had enough 72 * locations that all of the packet data has been saved. 73 * The RLR should only be read when a receive packet is 74 * available for processing (the receive occupancy is 75 * not zero). Once the RLR is read, the receive packet 76 * data should be read from the receive data FIFO before 77 * the RLR is read again. 78 * 79 * [F] page 17, Receive Length Register (RLR) 80 */ 81 if (in_be32(&fifo_ctrl->rdfo) & LL_FIFO_RDFO_MASK) { 82 length = in_be32(&fifo_ctrl->rlf) & LL_FIFO_RLF_MASK; 83 } else { 84 printf("%s: Got error, no receive occupancy\n", 85 __func__); 86 return -1; 87 } 88 89 if (length > PKTSIZE_ALIGN) { 90 printf("%s: Got error, receive package too big (%i)\n", 91 __func__, length); 92 ll_temac_reset_fifo(dev); 93 return -1; 94 } 95 96 for (i = 0; i < length; i += 4) 97 *buf++ = in_be32(&fifo_ctrl->rdfd); 98 99 NetReceive(NetRxPackets[0], length); 100 } 101 102 return 0; 103 } 104 105 int ll_temac_send_fifo(struct eth_device *dev, void *packet, int length) 106 { 107 int i; 108 u32 *buf = (u32 *)packet; 109 struct ll_temac *ll_temac = dev->priv; 110 struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; 111 112 if (length < LL_FIFO_TLF_MIN) { 113 printf("%s: Got error, transmit package too small (%i)\n", 114 __func__, length); 115 return -1; 116 } 117 118 if (length > LL_FIFO_TLF_MAX) { 119 printf("%s: Got error, transmit package too big (%i)\n", 120 __func__, length); 121 return -1; 122 } 123 124 for (i = 0; i < length; i += 4) 125 out_be32(&fifo_ctrl->tdfd, *buf++); 126 127 /* 128 * Once the packet length is written to the TLR it is 129 * automatically moved to the transmit data FIFO with 130 * the packet data freeing up the TLR for another value. 131 * The packet length must be written to the TLR after 132 * the packet data is written to the transmit data FIFO. 133 * It is not valid to write data for multiple packets 134 * to the transmit data FIFO before writing the packet 135 * length values. 136 * 137 * [F] page 17, Transmit Length Register (TLR) 138 */ 139 out_be32(&fifo_ctrl->tlf, length); 140 141 return 0; 142 } 143