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 * SPDX-License-Identifier: GPL-2.0+ 17 * 18 * [0]: http://www.xilinx.com/support/documentation 19 * 20 * [F]: [0]/ip_documentation/xps_ll_fifo.pdf 21 * [S]: [0]/ip_documentation/xps_ll_temac.pdf 22 * [A]: [0]/application_notes/xapp1041.pdf 23 */ 24 25 #include <config.h> 26 #include <common.h> 27 #include <net.h> 28 29 #include <asm/types.h> 30 #include <asm/io.h> 31 32 #include "xilinx_ll_temac.h" 33 #include "xilinx_ll_temac_fifo.h" 34 35 int ll_temac_reset_fifo(struct eth_device *dev) 36 { 37 struct ll_temac *ll_temac = dev->priv; 38 struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; 39 40 out_be32(&fifo_ctrl->tdfr, LL_FIFO_TDFR_KEY); 41 out_be32(&fifo_ctrl->rdfr, LL_FIFO_RDFR_KEY); 42 out_be32(&fifo_ctrl->isr, ~0UL); 43 out_be32(&fifo_ctrl->ier, 0); 44 45 return 0; 46 } 47 48 int ll_temac_recv_fifo(struct eth_device *dev) 49 { 50 int i, length = 0; 51 u32 *buf = (u32 *)net_rx_packets[0]; 52 struct ll_temac *ll_temac = dev->priv; 53 struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; 54 55 if (in_be32(&fifo_ctrl->isr) & LL_FIFO_ISR_RC) { 56 57 /* reset isr */ 58 out_be32(&fifo_ctrl->isr, ~0UL); 59 60 /* 61 * MAYBE here: 62 * while (fifo_ctrl->isr); 63 */ 64 65 /* 66 * The length is written (into RLR) by the XPS LL FIFO 67 * when the packet is received across the RX LocalLink 68 * interface and the receive data FIFO had enough 69 * locations that all of the packet data has been saved. 70 * The RLR should only be read when a receive packet is 71 * available for processing (the receive occupancy is 72 * not zero). Once the RLR is read, the receive packet 73 * data should be read from the receive data FIFO before 74 * the RLR is read again. 75 * 76 * [F] page 17, Receive Length Register (RLR) 77 */ 78 if (in_be32(&fifo_ctrl->rdfo) & LL_FIFO_RDFO_MASK) { 79 length = in_be32(&fifo_ctrl->rlf) & LL_FIFO_RLF_MASK; 80 } else { 81 printf("%s: Got error, no receive occupancy\n", 82 __func__); 83 return -1; 84 } 85 86 if (length > PKTSIZE_ALIGN) { 87 printf("%s: Got error, receive package too big (%i)\n", 88 __func__, length); 89 ll_temac_reset_fifo(dev); 90 return -1; 91 } 92 93 for (i = 0; i < length; i += 4) 94 *buf++ = in_be32(&fifo_ctrl->rdfd); 95 96 net_process_received_packet(net_rx_packets[0], length); 97 } 98 99 return 0; 100 } 101 102 int ll_temac_send_fifo(struct eth_device *dev, void *packet, int length) 103 { 104 int i; 105 u32 *buf = (u32 *)packet; 106 struct ll_temac *ll_temac = dev->priv; 107 struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; 108 109 if (length < LL_FIFO_TLF_MIN) { 110 printf("%s: Got error, transmit package too small (%i)\n", 111 __func__, length); 112 return -1; 113 } 114 115 if (length > LL_FIFO_TLF_MAX) { 116 printf("%s: Got error, transmit package too big (%i)\n", 117 __func__, length); 118 return -1; 119 } 120 121 for (i = 0; i < length; i += 4) 122 out_be32(&fifo_ctrl->tdfd, *buf++); 123 124 /* 125 * Once the packet length is written to the TLR it is 126 * automatically moved to the transmit data FIFO with 127 * the packet data freeing up the TLR for another value. 128 * The packet length must be written to the TLR after 129 * the packet data is written to the transmit data FIFO. 130 * It is not valid to write data for multiple packets 131 * to the transmit data FIFO before writing the packet 132 * length values. 133 * 134 * [F] page 17, Transmit Length Register (TLR) 135 */ 136 out_be32(&fifo_ctrl->tlf, length); 137 138 return 0; 139 } 140