linux/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
   4 * DWC Ether MAC version 4.xx  has been used for  developing this code.
   5 *
   6 * This contains the functions to handle the dma.
   7 *
   8 * Copyright (C) 2015  STMicroelectronics Ltd
   9 *
  10 * Author: Alexandre Torgue <alexandre.torgue@st.com>
  11 */
  12
  13#include <linux/io.h>
  14#include "dwmac4.h"
  15#include "dwmac4_dma.h"
  16
  17static void dwmac4_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
  18{
  19        u32 value = readl(ioaddr + DMA_SYS_BUS_MODE);
  20        int i;
  21
  22        pr_info("dwmac4: Master AXI performs %s burst length\n",
  23                (value & DMA_SYS_BUS_FB) ? "fixed" : "any");
  24
  25        if (axi->axi_lpi_en)
  26                value |= DMA_AXI_EN_LPI;
  27        if (axi->axi_xit_frm)
  28                value |= DMA_AXI_LPI_XIT_FRM;
  29
  30        value &= ~DMA_AXI_WR_OSR_LMT;
  31        value |= (axi->axi_wr_osr_lmt & DMA_AXI_OSR_MAX) <<
  32                 DMA_AXI_WR_OSR_LMT_SHIFT;
  33
  34        value &= ~DMA_AXI_RD_OSR_LMT;
  35        value |= (axi->axi_rd_osr_lmt & DMA_AXI_OSR_MAX) <<
  36                 DMA_AXI_RD_OSR_LMT_SHIFT;
  37
  38        /* Depending on the UNDEF bit the Master AXI will perform any burst
  39         * length according to the BLEN programmed (by default all BLEN are
  40         * set).
  41         */
  42        for (i = 0; i < AXI_BLEN; i++) {
  43                switch (axi->axi_blen[i]) {
  44                case 256:
  45                        value |= DMA_AXI_BLEN256;
  46                        break;
  47                case 128:
  48                        value |= DMA_AXI_BLEN128;
  49                        break;
  50                case 64:
  51                        value |= DMA_AXI_BLEN64;
  52                        break;
  53                case 32:
  54                        value |= DMA_AXI_BLEN32;
  55                        break;
  56                case 16:
  57                        value |= DMA_AXI_BLEN16;
  58                        break;
  59                case 8:
  60                        value |= DMA_AXI_BLEN8;
  61                        break;
  62                case 4:
  63                        value |= DMA_AXI_BLEN4;
  64                        break;
  65                }
  66        }
  67
  68        writel(value, ioaddr + DMA_SYS_BUS_MODE);
  69}
  70
  71static void dwmac4_dma_init_rx_chan(void __iomem *ioaddr,
  72                                    struct stmmac_dma_cfg *dma_cfg,
  73                                    dma_addr_t dma_rx_phy, u32 chan)
  74{
  75        u32 value;
  76        u32 rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl;
  77
  78        value = readl(ioaddr + DMA_CHAN_RX_CONTROL(chan));
  79        value = value | (rxpbl << DMA_BUS_MODE_RPBL_SHIFT);
  80        writel(value, ioaddr + DMA_CHAN_RX_CONTROL(chan));
  81
  82        if (IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) && likely(dma_cfg->eame))
  83                writel(upper_32_bits(dma_rx_phy),
  84                       ioaddr + DMA_CHAN_RX_BASE_ADDR_HI(chan));
  85
  86        writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_CHAN_RX_BASE_ADDR(chan));
  87}
  88
  89static void dwmac4_dma_init_tx_chan(void __iomem *ioaddr,
  90                                    struct stmmac_dma_cfg *dma_cfg,
  91                                    dma_addr_t dma_tx_phy, u32 chan)
  92{
  93        u32 value;
  94        u32 txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;
  95
  96        value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
  97        value = value | (txpbl << DMA_BUS_MODE_PBL_SHIFT);
  98
  99        /* Enable OSP to get best performance */
 100        value |= DMA_CONTROL_OSP;
 101
 102        writel(value, ioaddr + DMA_CHAN_TX_CONTROL(chan));
 103
 104        if (IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) && likely(dma_cfg->eame))
 105                writel(upper_32_bits(dma_tx_phy),
 106                       ioaddr + DMA_CHAN_TX_BASE_ADDR_HI(chan));
 107
 108        writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_CHAN_TX_BASE_ADDR(chan));
 109}
 110
 111static void dwmac4_dma_init_channel(void __iomem *ioaddr,
 112                                    struct stmmac_dma_cfg *dma_cfg, u32 chan)
 113{
 114        u32 value;
 115
 116        /* common channel control register config */
 117        value = readl(ioaddr + DMA_CHAN_CONTROL(chan));
 118        if (dma_cfg->pblx8)
 119                value = value | DMA_BUS_MODE_PBL;
 120        writel(value, ioaddr + DMA_CHAN_CONTROL(chan));
 121
 122        /* Mask interrupts by writing to CSR7 */
 123        writel(DMA_CHAN_INTR_DEFAULT_MASK,
 124               ioaddr + DMA_CHAN_INTR_ENA(chan));
 125}
 126
 127static void dwmac4_dma_init(void __iomem *ioaddr,
 128                            struct stmmac_dma_cfg *dma_cfg, int atds)
 129{
 130        u32 value = readl(ioaddr + DMA_SYS_BUS_MODE);
 131
 132        /* Set the Fixed burst mode */
 133        if (dma_cfg->fixed_burst)
 134                value |= DMA_SYS_BUS_FB;
 135
 136        /* Mixed Burst has no effect when fb is set */
 137        if (dma_cfg->mixed_burst)
 138                value |= DMA_SYS_BUS_MB;
 139
 140        if (dma_cfg->aal)
 141                value |= DMA_SYS_BUS_AAL;
 142
 143        if (dma_cfg->eame)
 144                value |= DMA_SYS_BUS_EAME;
 145
 146        writel(value, ioaddr + DMA_SYS_BUS_MODE);
 147}
 148
 149static void _dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 channel,
 150                                  u32 *reg_space)
 151{
 152        reg_space[DMA_CHAN_CONTROL(channel) / 4] =
 153                readl(ioaddr + DMA_CHAN_CONTROL(channel));
 154        reg_space[DMA_CHAN_TX_CONTROL(channel) / 4] =
 155                readl(ioaddr + DMA_CHAN_TX_CONTROL(channel));
 156        reg_space[DMA_CHAN_RX_CONTROL(channel) / 4] =
 157                readl(ioaddr + DMA_CHAN_RX_CONTROL(channel));
 158        reg_space[DMA_CHAN_TX_BASE_ADDR(channel) / 4] =
 159                readl(ioaddr + DMA_CHAN_TX_BASE_ADDR(channel));
 160        reg_space[DMA_CHAN_RX_BASE_ADDR(channel) / 4] =
 161                readl(ioaddr + DMA_CHAN_RX_BASE_ADDR(channel));
 162        reg_space[DMA_CHAN_TX_END_ADDR(channel) / 4] =
 163                readl(ioaddr + DMA_CHAN_TX_END_ADDR(channel));
 164        reg_space[DMA_CHAN_RX_END_ADDR(channel) / 4] =
 165                readl(ioaddr + DMA_CHAN_RX_END_ADDR(channel));
 166        reg_space[DMA_CHAN_TX_RING_LEN(channel) / 4] =
 167                readl(ioaddr + DMA_CHAN_TX_RING_LEN(channel));
 168        reg_space[DMA_CHAN_RX_RING_LEN(channel) / 4] =
 169                readl(ioaddr + DMA_CHAN_RX_RING_LEN(channel));
 170        reg_space[DMA_CHAN_INTR_ENA(channel) / 4] =
 171                readl(ioaddr + DMA_CHAN_INTR_ENA(channel));
 172        reg_space[DMA_CHAN_RX_WATCHDOG(channel) / 4] =
 173                readl(ioaddr + DMA_CHAN_RX_WATCHDOG(channel));
 174        reg_space[DMA_CHAN_SLOT_CTRL_STATUS(channel) / 4] =
 175                readl(ioaddr + DMA_CHAN_SLOT_CTRL_STATUS(channel));
 176        reg_space[DMA_CHAN_CUR_TX_DESC(channel) / 4] =
 177                readl(ioaddr + DMA_CHAN_CUR_TX_DESC(channel));
 178        reg_space[DMA_CHAN_CUR_RX_DESC(channel) / 4] =
 179                readl(ioaddr + DMA_CHAN_CUR_RX_DESC(channel));
 180        reg_space[DMA_CHAN_CUR_TX_BUF_ADDR(channel) / 4] =
 181                readl(ioaddr + DMA_CHAN_CUR_TX_BUF_ADDR(channel));
 182        reg_space[DMA_CHAN_CUR_RX_BUF_ADDR(channel) / 4] =
 183                readl(ioaddr + DMA_CHAN_CUR_RX_BUF_ADDR(channel));
 184        reg_space[DMA_CHAN_STATUS(channel) / 4] =
 185                readl(ioaddr + DMA_CHAN_STATUS(channel));
 186}
 187
 188static void dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 *reg_space)
 189{
 190        int i;
 191
 192        for (i = 0; i < DMA_CHANNEL_NB_MAX; i++)
 193                _dwmac4_dump_dma_regs(ioaddr, i, reg_space);
 194}
 195
 196static void dwmac4_rx_watchdog(void __iomem *ioaddr, u32 riwt, u32 number_chan)
 197{
 198        u32 chan;
 199
 200        for (chan = 0; chan < number_chan; chan++)
 201                writel(riwt, ioaddr + DMA_CHAN_RX_WATCHDOG(chan));
 202}
 203
 204static void dwmac4_dma_rx_chan_op_mode(void __iomem *ioaddr, int mode,
 205                                       u32 channel, int fifosz, u8 qmode)
 206{
 207        unsigned int rqs = fifosz / 256 - 1;
 208        u32 mtl_rx_op, mtl_rx_int;
 209
 210        mtl_rx_op = readl(ioaddr + MTL_CHAN_RX_OP_MODE(channel));
 211
 212        if (mode == SF_DMA_MODE) {
 213                pr_debug("GMAC: enable RX store and forward mode\n");
 214                mtl_rx_op |= MTL_OP_MODE_RSF;
 215        } else {
 216                pr_debug("GMAC: disable RX SF mode (threshold %d)\n", mode);
 217                mtl_rx_op &= ~MTL_OP_MODE_RSF;
 218                mtl_rx_op &= MTL_OP_MODE_RTC_MASK;
 219                if (mode <= 32)
 220                        mtl_rx_op |= MTL_OP_MODE_RTC_32;
 221                else if (mode <= 64)
 222                        mtl_rx_op |= MTL_OP_MODE_RTC_64;
 223                else if (mode <= 96)
 224                        mtl_rx_op |= MTL_OP_MODE_RTC_96;
 225                else
 226                        mtl_rx_op |= MTL_OP_MODE_RTC_128;
 227        }
 228
 229        mtl_rx_op &= ~MTL_OP_MODE_RQS_MASK;
 230        mtl_rx_op |= rqs << MTL_OP_MODE_RQS_SHIFT;
 231
 232        /* Enable flow control only if each channel gets 4 KiB or more FIFO and
 233         * only if channel is not an AVB channel.
 234         */
 235        if ((fifosz >= 4096) && (qmode != MTL_QUEUE_AVB)) {
 236                unsigned int rfd, rfa;
 237
 238                mtl_rx_op |= MTL_OP_MODE_EHFC;
 239
 240                /* Set Threshold for Activating Flow Control to min 2 frames,
 241                 * i.e. 1500 * 2 = 3000 bytes.
 242                 *
 243                 * Set Threshold for Deactivating Flow Control to min 1 frame,
 244                 * i.e. 1500 bytes.
 245                 */
 246                switch (fifosz) {
 247                case 4096:
 248                        /* This violates the above formula because of FIFO size
 249                         * limit therefore overflow may occur in spite of this.
 250                         */
 251                        rfd = 0x03; /* Full-2.5K */
 252                        rfa = 0x01; /* Full-1.5K */
 253                        break;
 254
 255                default:
 256                        rfd = 0x07; /* Full-4.5K */
 257                        rfa = 0x04; /* Full-3K */
 258                        break;
 259                }
 260
 261                mtl_rx_op &= ~MTL_OP_MODE_RFD_MASK;
 262                mtl_rx_op |= rfd << MTL_OP_MODE_RFD_SHIFT;
 263
 264                mtl_rx_op &= ~MTL_OP_MODE_RFA_MASK;
 265                mtl_rx_op |= rfa << MTL_OP_MODE_RFA_SHIFT;
 266        }
 267
 268        writel(mtl_rx_op, ioaddr + MTL_CHAN_RX_OP_MODE(channel));
 269
 270        /* Enable MTL RX overflow */
 271        mtl_rx_int = readl(ioaddr + MTL_CHAN_INT_CTRL(channel));
 272        writel(mtl_rx_int | MTL_RX_OVERFLOW_INT_EN,
 273               ioaddr + MTL_CHAN_INT_CTRL(channel));
 274}
 275
 276static void dwmac4_dma_tx_chan_op_mode(void __iomem *ioaddr, int mode,
 277                                       u32 channel, int fifosz, u8 qmode)
 278{
 279        u32 mtl_tx_op = readl(ioaddr + MTL_CHAN_TX_OP_MODE(channel));
 280        unsigned int tqs = fifosz / 256 - 1;
 281
 282        if (mode == SF_DMA_MODE) {
 283                pr_debug("GMAC: enable TX store and forward mode\n");
 284                /* Transmit COE type 2 cannot be done in cut-through mode. */
 285                mtl_tx_op |= MTL_OP_MODE_TSF;
 286        } else {
 287                pr_debug("GMAC: disabling TX SF (threshold %d)\n", mode);
 288                mtl_tx_op &= ~MTL_OP_MODE_TSF;
 289                mtl_tx_op &= MTL_OP_MODE_TTC_MASK;
 290                /* Set the transmit threshold */
 291                if (mode <= 32)
 292                        mtl_tx_op |= MTL_OP_MODE_TTC_32;
 293                else if (mode <= 64)
 294                        mtl_tx_op |= MTL_OP_MODE_TTC_64;
 295                else if (mode <= 96)
 296                        mtl_tx_op |= MTL_OP_MODE_TTC_96;
 297                else if (mode <= 128)
 298                        mtl_tx_op |= MTL_OP_MODE_TTC_128;
 299                else if (mode <= 192)
 300                        mtl_tx_op |= MTL_OP_MODE_TTC_192;
 301                else if (mode <= 256)
 302                        mtl_tx_op |= MTL_OP_MODE_TTC_256;
 303                else if (mode <= 384)
 304                        mtl_tx_op |= MTL_OP_MODE_TTC_384;
 305                else
 306                        mtl_tx_op |= MTL_OP_MODE_TTC_512;
 307        }
 308        /* For an IP with DWC_EQOS_NUM_TXQ == 1, the fields TXQEN and TQS are RO
 309         * with reset values: TXQEN on, TQS == DWC_EQOS_TXFIFO_SIZE.
 310         * For an IP with DWC_EQOS_NUM_TXQ > 1, the fields TXQEN and TQS are R/W
 311         * with reset values: TXQEN off, TQS 256 bytes.
 312         *
 313         * TXQEN must be written for multi-channel operation and TQS must
 314         * reflect the available fifo size per queue (total fifo size / number
 315         * of enabled queues).
 316         */
 317        mtl_tx_op &= ~MTL_OP_MODE_TXQEN_MASK;
 318        if (qmode != MTL_QUEUE_AVB)
 319                mtl_tx_op |= MTL_OP_MODE_TXQEN;
 320        else
 321                mtl_tx_op |= MTL_OP_MODE_TXQEN_AV;
 322        mtl_tx_op &= ~MTL_OP_MODE_TQS_MASK;
 323        mtl_tx_op |= tqs << MTL_OP_MODE_TQS_SHIFT;
 324
 325        writel(mtl_tx_op, ioaddr +  MTL_CHAN_TX_OP_MODE(channel));
 326}
 327
 328static void dwmac4_get_hw_feature(void __iomem *ioaddr,
 329                                  struct dma_features *dma_cap)
 330{
 331        u32 hw_cap = readl(ioaddr + GMAC_HW_FEATURE0);
 332
 333        /*  MAC HW feature0 */
 334        dma_cap->mbps_10_100 = (hw_cap & GMAC_HW_FEAT_MIISEL);
 335        dma_cap->mbps_1000 = (hw_cap & GMAC_HW_FEAT_GMIISEL) >> 1;
 336        dma_cap->half_duplex = (hw_cap & GMAC_HW_FEAT_HDSEL) >> 2;
 337        dma_cap->vlhash = (hw_cap & GMAC_HW_FEAT_VLHASH) >> 4;
 338        dma_cap->multi_addr = (hw_cap & GMAC_HW_FEAT_ADDMAC) >> 18;
 339        dma_cap->pcs = (hw_cap & GMAC_HW_FEAT_PCSSEL) >> 3;
 340        dma_cap->sma_mdio = (hw_cap & GMAC_HW_FEAT_SMASEL) >> 5;
 341        dma_cap->pmt_remote_wake_up = (hw_cap & GMAC_HW_FEAT_RWKSEL) >> 6;
 342        dma_cap->pmt_magic_frame = (hw_cap & GMAC_HW_FEAT_MGKSEL) >> 7;
 343        /* MMC */
 344        dma_cap->rmon = (hw_cap & GMAC_HW_FEAT_MMCSEL) >> 8;
 345        /* IEEE 1588-2008 */
 346        dma_cap->atime_stamp = (hw_cap & GMAC_HW_FEAT_TSSEL) >> 12;
 347        /* 802.3az - Energy-Efficient Ethernet (EEE) */
 348        dma_cap->eee = (hw_cap & GMAC_HW_FEAT_EEESEL) >> 13;
 349        /* TX and RX csum */
 350        dma_cap->tx_coe = (hw_cap & GMAC_HW_FEAT_TXCOSEL) >> 14;
 351        dma_cap->rx_coe =  (hw_cap & GMAC_HW_FEAT_RXCOESEL) >> 16;
 352        dma_cap->vlins = (hw_cap & GMAC_HW_FEAT_SAVLANINS) >> 27;
 353        dma_cap->arpoffsel = (hw_cap & GMAC_HW_FEAT_ARPOFFSEL) >> 9;
 354
 355        /* MAC HW feature1 */
 356        hw_cap = readl(ioaddr + GMAC_HW_FEATURE1);
 357        dma_cap->l3l4fnum = (hw_cap & GMAC_HW_FEAT_L3L4FNUM) >> 27;
 358        dma_cap->hash_tb_sz = (hw_cap & GMAC_HW_HASH_TB_SZ) >> 24;
 359        dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
 360        dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
 361        dma_cap->sphen = (hw_cap & GMAC_HW_FEAT_SPHEN) >> 17;
 362
 363        dma_cap->addr64 = (hw_cap & GMAC_HW_ADDR64) >> 14;
 364        switch (dma_cap->addr64) {
 365        case 0:
 366                dma_cap->addr64 = 32;
 367                break;
 368        case 1:
 369                dma_cap->addr64 = 40;
 370                break;
 371        case 2:
 372                dma_cap->addr64 = 48;
 373                break;
 374        default:
 375                dma_cap->addr64 = 32;
 376                break;
 377        }
 378
 379        /* RX and TX FIFO sizes are encoded as log2(n / 128). Undo that by
 380         * shifting and store the sizes in bytes.
 381         */
 382        dma_cap->tx_fifo_size = 128 << ((hw_cap & GMAC_HW_TXFIFOSIZE) >> 6);
 383        dma_cap->rx_fifo_size = 128 << ((hw_cap & GMAC_HW_RXFIFOSIZE) >> 0);
 384        /* MAC HW feature2 */
 385        hw_cap = readl(ioaddr + GMAC_HW_FEATURE2);
 386        /* TX and RX number of channels */
 387        dma_cap->number_rx_channel =
 388                ((hw_cap & GMAC_HW_FEAT_RXCHCNT) >> 12) + 1;
 389        dma_cap->number_tx_channel =
 390                ((hw_cap & GMAC_HW_FEAT_TXCHCNT) >> 18) + 1;
 391        /* TX and RX number of queues */
 392        dma_cap->number_rx_queues =
 393                ((hw_cap & GMAC_HW_FEAT_RXQCNT) >> 0) + 1;
 394        dma_cap->number_tx_queues =
 395                ((hw_cap & GMAC_HW_FEAT_TXQCNT) >> 6) + 1;
 396        /* PPS output */
 397        dma_cap->pps_out_num = (hw_cap & GMAC_HW_FEAT_PPSOUTNUM) >> 24;
 398
 399        /* IEEE 1588-2002 */
 400        dma_cap->time_stamp = 0;
 401
 402        /* MAC HW feature3 */
 403        hw_cap = readl(ioaddr + GMAC_HW_FEATURE3);
 404
 405        /* 5.10 Features */
 406        dma_cap->asp = (hw_cap & GMAC_HW_FEAT_ASP) >> 28;
 407        dma_cap->tbssel = (hw_cap & GMAC_HW_FEAT_TBSSEL) >> 27;
 408        dma_cap->fpesel = (hw_cap & GMAC_HW_FEAT_FPESEL) >> 26;
 409        dma_cap->estwid = (hw_cap & GMAC_HW_FEAT_ESTWID) >> 20;
 410        dma_cap->estdep = (hw_cap & GMAC_HW_FEAT_ESTDEP) >> 17;
 411        dma_cap->estsel = (hw_cap & GMAC_HW_FEAT_ESTSEL) >> 16;
 412        dma_cap->frpes = (hw_cap & GMAC_HW_FEAT_FRPES) >> 13;
 413        dma_cap->frpbs = (hw_cap & GMAC_HW_FEAT_FRPBS) >> 11;
 414        dma_cap->frpsel = (hw_cap & GMAC_HW_FEAT_FRPSEL) >> 10;
 415        dma_cap->dvlan = (hw_cap & GMAC_HW_FEAT_DVLAN) >> 5;
 416}
 417
 418/* Enable/disable TSO feature and set MSS */
 419static void dwmac4_enable_tso(void __iomem *ioaddr, bool en, u32 chan)
 420{
 421        u32 value;
 422
 423        if (en) {
 424                /* enable TSO */
 425                value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
 426                writel(value | DMA_CONTROL_TSE,
 427                       ioaddr + DMA_CHAN_TX_CONTROL(chan));
 428        } else {
 429                /* enable TSO */
 430                value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
 431                writel(value & ~DMA_CONTROL_TSE,
 432                       ioaddr + DMA_CHAN_TX_CONTROL(chan));
 433        }
 434}
 435
 436static void dwmac4_qmode(void __iomem *ioaddr, u32 channel, u8 qmode)
 437{
 438        u32 mtl_tx_op = readl(ioaddr + MTL_CHAN_TX_OP_MODE(channel));
 439
 440        mtl_tx_op &= ~MTL_OP_MODE_TXQEN_MASK;
 441        if (qmode != MTL_QUEUE_AVB)
 442                mtl_tx_op |= MTL_OP_MODE_TXQEN;
 443        else
 444                mtl_tx_op |= MTL_OP_MODE_TXQEN_AV;
 445
 446        writel(mtl_tx_op, ioaddr +  MTL_CHAN_TX_OP_MODE(channel));
 447}
 448
 449static void dwmac4_set_bfsize(void __iomem *ioaddr, int bfsize, u32 chan)
 450{
 451        u32 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(chan));
 452
 453        value &= ~DMA_RBSZ_MASK;
 454        value |= (bfsize << DMA_RBSZ_SHIFT) & DMA_RBSZ_MASK;
 455
 456        writel(value, ioaddr + DMA_CHAN_RX_CONTROL(chan));
 457}
 458
 459static void dwmac4_enable_sph(void __iomem *ioaddr, bool en, u32 chan)
 460{
 461        u32 value = readl(ioaddr + GMAC_EXT_CONFIG);
 462
 463        value &= ~GMAC_CONFIG_HDSMS;
 464        value |= GMAC_CONFIG_HDSMS_256; /* Segment max 256 bytes */
 465        writel(value, ioaddr + GMAC_EXT_CONFIG);
 466
 467        value = readl(ioaddr + DMA_CHAN_CONTROL(chan));
 468        if (en)
 469                value |= DMA_CONTROL_SPH;
 470        else
 471                value &= ~DMA_CONTROL_SPH;
 472        writel(value, ioaddr + DMA_CHAN_CONTROL(chan));
 473}
 474
 475static int dwmac4_enable_tbs(void __iomem *ioaddr, bool en, u32 chan)
 476{
 477        u32 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
 478
 479        if (en)
 480                value |= DMA_CONTROL_EDSE;
 481        else
 482                value &= ~DMA_CONTROL_EDSE;
 483
 484        writel(value, ioaddr + DMA_CHAN_TX_CONTROL(chan));
 485
 486        value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan)) & DMA_CONTROL_EDSE;
 487        if (en && !value)
 488                return -EIO;
 489
 490        writel(DMA_TBS_DEF_FTOS, ioaddr + DMA_TBS_CTRL);
 491        return 0;
 492}
 493
 494const struct stmmac_dma_ops dwmac4_dma_ops = {
 495        .reset = dwmac4_dma_reset,
 496        .init = dwmac4_dma_init,
 497        .init_chan = dwmac4_dma_init_channel,
 498        .init_rx_chan = dwmac4_dma_init_rx_chan,
 499        .init_tx_chan = dwmac4_dma_init_tx_chan,
 500        .axi = dwmac4_dma_axi,
 501        .dump_regs = dwmac4_dump_dma_regs,
 502        .dma_rx_mode = dwmac4_dma_rx_chan_op_mode,
 503        .dma_tx_mode = dwmac4_dma_tx_chan_op_mode,
 504        .enable_dma_irq = dwmac4_enable_dma_irq,
 505        .disable_dma_irq = dwmac4_disable_dma_irq,
 506        .start_tx = dwmac4_dma_start_tx,
 507        .stop_tx = dwmac4_dma_stop_tx,
 508        .start_rx = dwmac4_dma_start_rx,
 509        .stop_rx = dwmac4_dma_stop_rx,
 510        .dma_interrupt = dwmac4_dma_interrupt,
 511        .get_hw_feature = dwmac4_get_hw_feature,
 512        .rx_watchdog = dwmac4_rx_watchdog,
 513        .set_rx_ring_len = dwmac4_set_rx_ring_len,
 514        .set_tx_ring_len = dwmac4_set_tx_ring_len,
 515        .set_rx_tail_ptr = dwmac4_set_rx_tail_ptr,
 516        .set_tx_tail_ptr = dwmac4_set_tx_tail_ptr,
 517        .enable_tso = dwmac4_enable_tso,
 518        .qmode = dwmac4_qmode,
 519        .set_bfsize = dwmac4_set_bfsize,
 520        .enable_sph = dwmac4_enable_sph,
 521};
 522
 523const struct stmmac_dma_ops dwmac410_dma_ops = {
 524        .reset = dwmac4_dma_reset,
 525        .init = dwmac4_dma_init,
 526        .init_chan = dwmac4_dma_init_channel,
 527        .init_rx_chan = dwmac4_dma_init_rx_chan,
 528        .init_tx_chan = dwmac4_dma_init_tx_chan,
 529        .axi = dwmac4_dma_axi,
 530        .dump_regs = dwmac4_dump_dma_regs,
 531        .dma_rx_mode = dwmac4_dma_rx_chan_op_mode,
 532        .dma_tx_mode = dwmac4_dma_tx_chan_op_mode,
 533        .enable_dma_irq = dwmac410_enable_dma_irq,
 534        .disable_dma_irq = dwmac4_disable_dma_irq,
 535        .start_tx = dwmac4_dma_start_tx,
 536        .stop_tx = dwmac4_dma_stop_tx,
 537        .start_rx = dwmac4_dma_start_rx,
 538        .stop_rx = dwmac4_dma_stop_rx,
 539        .dma_interrupt = dwmac4_dma_interrupt,
 540        .get_hw_feature = dwmac4_get_hw_feature,
 541        .rx_watchdog = dwmac4_rx_watchdog,
 542        .set_rx_ring_len = dwmac4_set_rx_ring_len,
 543        .set_tx_ring_len = dwmac4_set_tx_ring_len,
 544        .set_rx_tail_ptr = dwmac4_set_rx_tail_ptr,
 545        .set_tx_tail_ptr = dwmac4_set_tx_tail_ptr,
 546        .enable_tso = dwmac4_enable_tso,
 547        .qmode = dwmac4_qmode,
 548        .set_bfsize = dwmac4_set_bfsize,
 549        .enable_sph = dwmac4_enable_sph,
 550        .enable_tbs = dwmac4_enable_tbs,
 551};
 552