LXR linux/drivers/net/ethernet/qualcomm/emac/emac-mac.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
   3 */
   4
   5/* EMAC DMA HW engine uses three rings:
   6 * Tx:
   7 *   TPD: Transmit Packet Descriptor ring.
   8 * Rx:
   9 *   RFD: Receive Free Descriptor ring.
  10 *     Ring of descriptors with empty buffers to be filled by Rx HW.
  11 *   RRD: Receive Return Descriptor ring.
  12 *     Ring of descriptors with buffers filled with received data.
  13 */
  14
  15#ifndef _EMAC_HW_H_
  16#define _EMAC_HW_H_
  17
  18/* EMAC_CSR register offsets */
  19#define EMAC_EMAC_WRAPPER_CSR1                                0x000000
  20#define EMAC_EMAC_WRAPPER_CSR2                                0x000004
  21#define EMAC_EMAC_WRAPPER_TX_TS_LO                            0x000104
  22#define EMAC_EMAC_WRAPPER_TX_TS_HI                            0x000108
  23#define EMAC_EMAC_WRAPPER_TX_TS_INX                           0x00010c
  24
  25/* DMA Order Settings */
  26enum emac_dma_order {
  27        emac_dma_ord_in = 1,
  28        emac_dma_ord_enh = 2,
  29        emac_dma_ord_out = 4
  30};
  31
  32enum emac_dma_req_block {
  33        emac_dma_req_128 = 0,
  34        emac_dma_req_256 = 1,
  35        emac_dma_req_512 = 2,
  36        emac_dma_req_1024 = 3,
  37        emac_dma_req_2048 = 4,
  38        emac_dma_req_4096 = 5
  39};
  40
  41/* Returns the value of bits idx...idx+n_bits */
  42#define BITS_GET(val, lo, hi) ((le32_to_cpu(val) & GENMASK((hi), (lo))) >> lo)
  43#define BITS_SET(val, lo, hi, new_val) \
  44        val = cpu_to_le32((le32_to_cpu(val) & (~GENMASK((hi), (lo)))) | \
  45                (((new_val) << (lo)) & GENMASK((hi), (lo))))
  46
  47/* RRD (Receive Return Descriptor) */
  48struct emac_rrd {
  49        u32     word[6];
  50
  51/* number of RFD */
  52#define RRD_NOR(rrd)                    BITS_GET((rrd)->word[0], 16, 19)
  53/* start consumer index of rfd-ring */
  54#define RRD_SI(rrd)                     BITS_GET((rrd)->word[0], 20, 31)
  55/* vlan-tag (CVID, CFI and PRI) */
  56#define RRD_CVALN_TAG(rrd)              BITS_GET((rrd)->word[2], 0, 15)
  57/* length of the packet */
  58#define RRD_PKT_SIZE(rrd)               BITS_GET((rrd)->word[3], 0, 13)
  59/* L4(TCP/UDP) checksum failed */
  60#define RRD_L4F(rrd)                    BITS_GET((rrd)->word[3], 14, 14)
  61/* vlan tagged */
  62#define RRD_CVTAG(rrd)                  BITS_GET((rrd)->word[3], 16, 16)
  63/* When set, indicates that the descriptor is updated by the IP core.
  64 * When cleared, indicates that the descriptor is invalid.
  65 */
  66#define RRD_UPDT(rrd)                   BITS_GET((rrd)->word[3], 31, 31)
  67#define RRD_UPDT_SET(rrd, val)          BITS_SET((rrd)->word[3], 31, 31, val)
  68/* timestamp low */
  69#define RRD_TS_LOW(rrd)                 BITS_GET((rrd)->word[4], 0, 29)
  70/* timestamp high */
  71#define RRD_TS_HI(rrd)                  le32_to_cpu((rrd)->word[5])
  72};
  73
  74/* TPD (Transmit Packet Descriptor) */
  75struct emac_tpd {
  76        u32                             word[4];
  77
  78/* Number of bytes of the transmit packet. (include 4-byte CRC) */
  79#define TPD_BUF_LEN_SET(tpd, val)       BITS_SET((tpd)->word[0], 0, 15, val)
  80/* Custom Checksum Offload: When set, ask IP core to offload custom checksum */
  81#define TPD_CSX_SET(tpd, val)           BITS_SET((tpd)->word[1], 8, 8, val)
  82/* TCP Large Send Offload: When set, ask IP core to do offload TCP Large Send */
  83#define TPD_LSO(tpd)                    BITS_GET((tpd)->word[1], 12, 12)
  84#define TPD_LSO_SET(tpd, val)           BITS_SET((tpd)->word[1], 12, 12, val)
  85/*  Large Send Offload Version: When set, indicates this is an LSOv2
  86 * (for both IPv4 and IPv6). When cleared, indicates this is an LSOv1
  87 * (only for IPv4).
  88 */
  89#define TPD_LSOV_SET(tpd, val)          BITS_SET((tpd)->word[1], 13, 13, val)
  90/* IPv4 packet: When set, indicates this is an  IPv4 packet, this bit is only
  91 * for LSOV2 format.
  92 */
  93#define TPD_IPV4_SET(tpd, val)          BITS_SET((tpd)->word[1], 16, 16, val)
  94/* 0: Ethernet   frame (DA+SA+TYPE+DATA+CRC)
  95 * 1: IEEE 802.3 frame (DA+SA+LEN+DSAP+SSAP+CTL+ORG+TYPE+DATA+CRC)
  96 */
  97#define TPD_TYP_SET(tpd, val)           BITS_SET((tpd)->word[1], 17, 17, val)
  98/* Low-32bit Buffer Address */
  99#define TPD_BUFFER_ADDR_L_SET(tpd, val) ((tpd)->word[2] = cpu_to_le32(val))
 100/* CVLAN Tag to be inserted if INS_VLAN_TAG is set, CVLAN TPID based on global
 101 * register configuration.
 102 */
 103#define TPD_CVLAN_TAG_SET(tpd, val)     BITS_SET((tpd)->word[3], 0, 15, val)
 104/*  Insert CVlan Tag: When set, ask MAC to insert CVLAN TAG to outgoing packet
 105 */
 106#define TPD_INSTC_SET(tpd, val)         BITS_SET((tpd)->word[3], 17, 17, val)
 107/* High-14bit Buffer Address, So, the 64b-bit address is
 108 * {DESC_CTRL_11_TX_DATA_HIADDR[17:0],(register) BUFFER_ADDR_H, BUFFER_ADDR_L}
 109 * Extend TPD_BUFFER_ADDR_H to [31, 18], because we never enable timestamping.
 110 */
 111#define TPD_BUFFER_ADDR_H_SET(tpd, val) BITS_SET((tpd)->word[3], 18, 31, val)
 112/* Format D. Word offset from the 1st byte of this packet to start to calculate
 113 * the custom checksum.
 114 */
 115#define TPD_PAYLOAD_OFFSET_SET(tpd, val) BITS_SET((tpd)->word[1], 0, 7, val)
 116/*  Format D. Word offset from the 1st byte of this packet to fill the custom
 117 * checksum to
 118 */
 119#define TPD_CXSUM_OFFSET_SET(tpd, val)  BITS_SET((tpd)->word[1], 18, 25, val)
 120
 121/* Format C. TCP Header offset from the 1st byte of this packet. (byte unit) */
 122#define TPD_TCPHDR_OFFSET_SET(tpd, val) BITS_SET((tpd)->word[1], 0, 7, val)
 123/* Format C. MSS (Maximum Segment Size) got from the protocol layer. (byte unit)
 124 */
 125#define TPD_MSS_SET(tpd, val)           BITS_SET((tpd)->word[1], 18, 30, val)
 126/* packet length in ext tpd */
 127#define TPD_PKT_LEN_SET(tpd, val)       ((tpd)->word[2] = cpu_to_le32(val))
 128};
 129
 130/* emac_ring_header represents a single, contiguous block of DMA space
 131 * mapped for the three descriptor rings (tpd, rfd, rrd)
 132 */
 133struct emac_ring_header {
 134        void                    *v_addr;        /* virtual address */
 135        dma_addr_t              dma_addr;       /* dma address */
 136        size_t                  size;           /* length in bytes */
 137        size_t                  used;
 138};
 139
 140/* emac_buffer is wrapper around a pointer to a socket buffer
 141 * so a DMA handle can be stored along with the skb
 142 */
 143struct emac_buffer {
 144        struct sk_buff          *skb;           /* socket buffer */
 145        u16                     length;         /* rx buffer length */
 146        dma_addr_t              dma_addr;       /* dma address */
 147};
 148
 149/* receive free descriptor (rfd) ring */
 150struct emac_rfd_ring {
 151        struct emac_buffer      *rfbuff;
 152        u32                     *v_addr;        /* virtual address */
 153        dma_addr_t              dma_addr;       /* dma address */
 154        size_t                  size;           /* length in bytes */
 155        unsigned int            count;          /* number of desc in the ring */
 156        unsigned int            produce_idx;
 157        unsigned int            process_idx;
 158        unsigned int            consume_idx;    /* unused */
 159};
 160
 161/* Receive Return Desciptor (RRD) ring */
 162struct emac_rrd_ring {
 163        u32                     *v_addr;        /* virtual address */
 164        dma_addr_t              dma_addr;       /* physical address */
 165        size_t                  size;           /* length in bytes */
 166        unsigned int            count;          /* number of desc in the ring */
 167        unsigned int            produce_idx;    /* unused */
 168        unsigned int            consume_idx;
 169};
 170
 171/* Rx queue */
 172struct emac_rx_queue {
 173        struct net_device       *netdev;        /* netdev ring belongs to */
 174        struct emac_rrd_ring    rrd;
 175        struct emac_rfd_ring    rfd;
 176        struct napi_struct      napi;
 177        struct emac_irq         *irq;
 178
 179        u32                     intr;
 180        u32                     produce_mask;
 181        u32                     process_mask;
 182        u32                     consume_mask;
 183
 184        u16                     produce_reg;
 185        u16                     process_reg;
 186        u16                     consume_reg;
 187
 188        u8                      produce_shift;
 189        u8                      process_shft;
 190        u8                      consume_shift;
 191};
 192
 193/* Transimit Packet Descriptor (tpd) ring */
 194struct emac_tpd_ring {
 195        struct emac_buffer      *tpbuff;
 196        u32                     *v_addr;        /* virtual address */
 197        dma_addr_t              dma_addr;       /* dma address */
 198
 199        size_t                  size;           /* length in bytes */
 200        unsigned int            count;          /* number of desc in the ring */
 201        unsigned int            produce_idx;
 202        unsigned int            consume_idx;
 203        unsigned int            last_produce_idx;
 204};
 205
 206/* Tx queue */
 207struct emac_tx_queue {
 208        struct emac_tpd_ring    tpd;
 209
 210        u32                     produce_mask;
 211        u32                     consume_mask;
 212
 213        u16                     max_packets;    /* max packets per interrupt */
 214        u16                     produce_reg;
 215        u16                     consume_reg;
 216
 217        u8                      produce_shift;
 218        u8                      consume_shift;
 219};
 220
 221struct emac_adapter;
 222
 223int  emac_mac_up(struct emac_adapter *adpt);
 224void emac_mac_down(struct emac_adapter *adpt);
 225void emac_mac_reset(struct emac_adapter *adpt);
 226void emac_mac_stop(struct emac_adapter *adpt);
 227void emac_mac_mode_config(struct emac_adapter *adpt);
 228void emac_mac_rx_process(struct emac_adapter *adpt, struct emac_rx_queue *rx_q,
 229                         int *num_pkts, int max_pkts);
 230netdev_tx_t emac_mac_tx_buf_send(struct emac_adapter *adpt,
 231                                 struct emac_tx_queue *tx_q,
 232                                 struct sk_buff *skb);
 233void emac_mac_tx_process(struct emac_adapter *adpt, struct emac_tx_queue *tx_q);
 234void emac_mac_rx_tx_ring_init_all(struct platform_device *pdev,
 235                                  struct emac_adapter *adpt);
 236int  emac_mac_rx_tx_rings_alloc_all(struct emac_adapter *adpt);
 237void emac_mac_rx_tx_rings_free_all(struct emac_adapter *adpt);
 238void emac_mac_multicast_addr_clear(struct emac_adapter *adpt);
 239void emac_mac_multicast_addr_set(struct emac_adapter *adpt, u8 *addr);
 240
 241#endif /*_EMAC_HW_H_*/
 242