1 /* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved. 2 * 3 * This program is free software; you can redistribute it and/or modify 4 * it under the terms of the GNU General Public License version 2 and 5 * only version 2 as published by the Free Software Foundation. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 */ 12 13 /* EMAC DMA HW engine uses three rings: 14 * Tx: 15 * TPD: Transmit Packet Descriptor ring. 16 * Rx: 17 * RFD: Receive Free Descriptor ring. 18 * Ring of descriptors with empty buffers to be filled by Rx HW. 19 * RRD: Receive Return Descriptor ring. 20 * Ring of descriptors with buffers filled with received data. 21 */ 22 23 #ifndef _EMAC_HW_H_ 24 #define _EMAC_HW_H_ 25 26 /* EMAC_CSR register offsets */ 27 #define EMAC_EMAC_WRAPPER_CSR1 0x000000 28 #define EMAC_EMAC_WRAPPER_CSR2 0x000004 29 #define EMAC_EMAC_WRAPPER_TX_TS_LO 0x000104 30 #define EMAC_EMAC_WRAPPER_TX_TS_HI 0x000108 31 #define EMAC_EMAC_WRAPPER_TX_TS_INX 0x00010c 32 33 /* DMA Order Settings */ 34 enum emac_dma_order { 35 emac_dma_ord_in = 1, 36 emac_dma_ord_enh = 2, 37 emac_dma_ord_out = 4 38 }; 39 40 enum emac_dma_req_block { 41 emac_dma_req_128 = 0, 42 emac_dma_req_256 = 1, 43 emac_dma_req_512 = 2, 44 emac_dma_req_1024 = 3, 45 emac_dma_req_2048 = 4, 46 emac_dma_req_4096 = 5 47 }; 48 49 /* Returns the value of bits idx...idx+n_bits */ 50 #define BITS_GET(val, lo, hi) ((le32_to_cpu(val) & GENMASK((hi), (lo))) >> lo) 51 #define BITS_SET(val, lo, hi, new_val) \ 52 val = cpu_to_le32((le32_to_cpu(val) & (~GENMASK((hi), (lo)))) | \ 53 (((new_val) << (lo)) & GENMASK((hi), (lo)))) 54 55 /* RRD (Receive Return Descriptor) */ 56 struct emac_rrd { 57 u32 word[6]; 58 59 /* number of RFD */ 60 #define RRD_NOR(rrd) BITS_GET((rrd)->word[0], 16, 19) 61 /* start consumer index of rfd-ring */ 62 #define RRD_SI(rrd) BITS_GET((rrd)->word[0], 20, 31) 63 /* vlan-tag (CVID, CFI and PRI) */ 64 #define RRD_CVALN_TAG(rrd) BITS_GET((rrd)->word[2], 0, 15) 65 /* length of the packet */ 66 #define RRD_PKT_SIZE(rrd) BITS_GET((rrd)->word[3], 0, 13) 67 /* L4(TCP/UDP) checksum failed */ 68 #define RRD_L4F(rrd) BITS_GET((rrd)->word[3], 14, 14) 69 /* vlan tagged */ 70 #define RRD_CVTAG(rrd) BITS_GET((rrd)->word[3], 16, 16) 71 /* When set, indicates that the descriptor is updated by the IP core. 72 * When cleared, indicates that the descriptor is invalid. 73 */ 74 #define RRD_UPDT(rrd) BITS_GET((rrd)->word[3], 31, 31) 75 #define RRD_UPDT_SET(rrd, val) BITS_SET((rrd)->word[3], 31, 31, val) 76 /* timestamp low */ 77 #define RRD_TS_LOW(rrd) BITS_GET((rrd)->word[4], 0, 29) 78 /* timestamp high */ 79 #define RRD_TS_HI(rrd) le32_to_cpu((rrd)->word[5]) 80 }; 81 82 /* TPD (Transmit Packet Descriptor) */ 83 struct emac_tpd { 84 u32 word[4]; 85 86 /* Number of bytes of the transmit packet. (include 4-byte CRC) */ 87 #define TPD_BUF_LEN_SET(tpd, val) BITS_SET((tpd)->word[0], 0, 15, val) 88 /* Custom Checksum Offload: When set, ask IP core to offload custom checksum */ 89 #define TPD_CSX_SET(tpd, val) BITS_SET((tpd)->word[1], 8, 8, val) 90 /* TCP Large Send Offload: When set, ask IP core to do offload TCP Large Send */ 91 #define TPD_LSO(tpd) BITS_GET((tpd)->word[1], 12, 12) 92 #define TPD_LSO_SET(tpd, val) BITS_SET((tpd)->word[1], 12, 12, val) 93 /* Large Send Offload Version: When set, indicates this is an LSOv2 94 * (for both IPv4 and IPv6). When cleared, indicates this is an LSOv1 95 * (only for IPv4). 96 */ 97 #define TPD_LSOV_SET(tpd, val) BITS_SET((tpd)->word[1], 13, 13, val) 98 /* IPv4 packet: When set, indicates this is an IPv4 packet, this bit is only 99 * for LSOV2 format. 100 */ 101 #define TPD_IPV4_SET(tpd, val) BITS_SET((tpd)->word[1], 16, 16, val) 102 /* 0: Ethernet frame (DA+SA+TYPE+DATA+CRC) 103 * 1: IEEE 802.3 frame (DA+SA+LEN+DSAP+SSAP+CTL+ORG+TYPE+DATA+CRC) 104 */ 105 #define TPD_TYP_SET(tpd, val) BITS_SET((tpd)->word[1], 17, 17, val) 106 /* Low-32bit Buffer Address */ 107 #define TPD_BUFFER_ADDR_L_SET(tpd, val) ((tpd)->word[2] = cpu_to_le32(val)) 108 /* CVLAN Tag to be inserted if INS_VLAN_TAG is set, CVLAN TPID based on global 109 * register configuration. 110 */ 111 #define TPD_CVLAN_TAG_SET(tpd, val) BITS_SET((tpd)->word[3], 0, 15, val) 112 /* Insert CVlan Tag: When set, ask MAC to insert CVLAN TAG to outgoing packet 113 */ 114 #define TPD_INSTC_SET(tpd, val) BITS_SET((tpd)->word[3], 17, 17, val) 115 /* High-14bit Buffer Address, So, the 64b-bit address is 116 * {DESC_CTRL_11_TX_DATA_HIADDR[17:0],(register) BUFFER_ADDR_H, BUFFER_ADDR_L} 117 * Extend TPD_BUFFER_ADDR_H to [31, 18], because we never enable timestamping. 118 */ 119 #define TPD_BUFFER_ADDR_H_SET(tpd, val) BITS_SET((tpd)->word[3], 18, 31, val) 120 /* Format D. Word offset from the 1st byte of this packet to start to calculate 121 * the custom checksum. 122 */ 123 #define TPD_PAYLOAD_OFFSET_SET(tpd, val) BITS_SET((tpd)->word[1], 0, 7, val) 124 /* Format D. Word offset from the 1st byte of this packet to fill the custom 125 * checksum to 126 */ 127 #define TPD_CXSUM_OFFSET_SET(tpd, val) BITS_SET((tpd)->word[1], 18, 25, val) 128 129 /* Format C. TCP Header offset from the 1st byte of this packet. (byte unit) */ 130 #define TPD_TCPHDR_OFFSET_SET(tpd, val) BITS_SET((tpd)->word[1], 0, 7, val) 131 /* Format C. MSS (Maximum Segment Size) got from the protocol layer. (byte unit) 132 */ 133 #define TPD_MSS_SET(tpd, val) BITS_SET((tpd)->word[1], 18, 30, val) 134 /* packet length in ext tpd */ 135 #define TPD_PKT_LEN_SET(tpd, val) ((tpd)->word[2] = cpu_to_le32(val)) 136 }; 137 138 /* emac_ring_header represents a single, contiguous block of DMA space 139 * mapped for the three descriptor rings (tpd, rfd, rrd) 140 */ 141 struct emac_ring_header { 142 void *v_addr; /* virtual address */ 143 dma_addr_t dma_addr; /* dma address */ 144 size_t size; /* length in bytes */ 145 size_t used; 146 }; 147 148 /* emac_buffer is wrapper around a pointer to a socket buffer 149 * so a DMA handle can be stored along with the skb 150 */ 151 struct emac_buffer { 152 struct sk_buff *skb; /* socket buffer */ 153 u16 length; /* rx buffer length */ 154 dma_addr_t dma_addr; /* dma address */ 155 }; 156 157 /* receive free descriptor (rfd) ring */ 158 struct emac_rfd_ring { 159 struct emac_buffer *rfbuff; 160 u32 *v_addr; /* virtual address */ 161 dma_addr_t dma_addr; /* dma address */ 162 size_t size; /* length in bytes */ 163 unsigned int count; /* number of desc in the ring */ 164 unsigned int produce_idx; 165 unsigned int process_idx; 166 unsigned int consume_idx; /* unused */ 167 }; 168 169 /* Receive Return Desciptor (RRD) ring */ 170 struct emac_rrd_ring { 171 u32 *v_addr; /* virtual address */ 172 dma_addr_t dma_addr; /* physical address */ 173 size_t size; /* length in bytes */ 174 unsigned int count; /* number of desc in the ring */ 175 unsigned int produce_idx; /* unused */ 176 unsigned int consume_idx; 177 }; 178 179 /* Rx queue */ 180 struct emac_rx_queue { 181 struct net_device *netdev; /* netdev ring belongs to */ 182 struct emac_rrd_ring rrd; 183 struct emac_rfd_ring rfd; 184 struct napi_struct napi; 185 struct emac_irq *irq; 186 187 u32 intr; 188 u32 produce_mask; 189 u32 process_mask; 190 u32 consume_mask; 191 192 u16 produce_reg; 193 u16 process_reg; 194 u16 consume_reg; 195 196 u8 produce_shift; 197 u8 process_shft; 198 u8 consume_shift; 199 }; 200 201 /* Transimit Packet Descriptor (tpd) ring */ 202 struct emac_tpd_ring { 203 struct emac_buffer *tpbuff; 204 u32 *v_addr; /* virtual address */ 205 dma_addr_t dma_addr; /* dma address */ 206 207 size_t size; /* length in bytes */ 208 unsigned int count; /* number of desc in the ring */ 209 unsigned int produce_idx; 210 unsigned int consume_idx; 211 unsigned int last_produce_idx; 212 }; 213 214 /* Tx queue */ 215 struct emac_tx_queue { 216 struct emac_tpd_ring tpd; 217 218 u32 produce_mask; 219 u32 consume_mask; 220 221 u16 max_packets; /* max packets per interrupt */ 222 u16 produce_reg; 223 u16 consume_reg; 224 225 u8 produce_shift; 226 u8 consume_shift; 227 }; 228 229 struct emac_adapter; 230 231 int emac_mac_up(struct emac_adapter *adpt); 232 void emac_mac_down(struct emac_adapter *adpt); 233 void emac_mac_reset(struct emac_adapter *adpt); 234 void emac_mac_stop(struct emac_adapter *adpt); 235 void emac_mac_mode_config(struct emac_adapter *adpt); 236 void emac_mac_rx_process(struct emac_adapter *adpt, struct emac_rx_queue *rx_q, 237 int *num_pkts, int max_pkts); 238 int emac_mac_tx_buf_send(struct emac_adapter *adpt, struct emac_tx_queue *tx_q, 239 struct sk_buff *skb); 240 void emac_mac_tx_process(struct emac_adapter *adpt, struct emac_tx_queue *tx_q); 241 void emac_mac_rx_tx_ring_init_all(struct platform_device *pdev, 242 struct emac_adapter *adpt); 243 int emac_mac_rx_tx_rings_alloc_all(struct emac_adapter *adpt); 244 void emac_mac_rx_tx_rings_free_all(struct emac_adapter *adpt); 245 void emac_mac_multicast_addr_clear(struct emac_adapter *adpt); 246 void emac_mac_multicast_addr_set(struct emac_adapter *adpt, u8 *addr); 247 248 #endif /*_EMAC_HW_H_*/ 249
