drivers/net/ethernet/ni/nixge.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2016-2017, National Instruments Corp.
   3  *
   4  * Author: Moritz Fischer <mdf@kernel.org>
   5  */
   6
   7 #include <linux/etherdevice.h>
   8 #include <linux/module.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/of.h>
  11 #include <linux/of_mdio.h>
  12 #include <linux/of_net.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/phy.h>
  16 #include <linux/mii.h>
  17 #include <linux/nvmem-consumer.h>
  18 #include <linux/ethtool.h>
  19 #include <linux/iopoll.h>
  20
  21 #define TX_BD_NUM               64
  22 #define RX_BD_NUM               128
  23
  24 /* Axi DMA Register definitions */
  25 #define XAXIDMA_TX_CR_OFFSET    0x00 /* Channel control */
  26 #define XAXIDMA_TX_SR_OFFSET    0x04 /* Status */
  27 #define XAXIDMA_TX_CDESC_OFFSET 0x08 /* Current descriptor pointer */
  28 #define XAXIDMA_TX_TDESC_OFFSET 0x10 /* Tail descriptor pointer */
  29
  30 #define XAXIDMA_RX_CR_OFFSET    0x30 /* Channel control */
  31 #define XAXIDMA_RX_SR_OFFSET    0x34 /* Status */
  32 #define XAXIDMA_RX_CDESC_OFFSET 0x38 /* Current descriptor pointer */
  33 #define XAXIDMA_RX_TDESC_OFFSET 0x40 /* Tail descriptor pointer */
  34
  35 #define XAXIDMA_CR_RUNSTOP_MASK 0x1 /* Start/stop DMA channel */
  36 #define XAXIDMA_CR_RESET_MASK   0x4 /* Reset DMA engine */
  37
  38 #define XAXIDMA_BD_CTRL_LENGTH_MASK     0x007FFFFF /* Requested len */
  39 #define XAXIDMA_BD_CTRL_TXSOF_MASK      0x08000000 /* First tx packet */
  40 #define XAXIDMA_BD_CTRL_TXEOF_MASK      0x04000000 /* Last tx packet */
  41 #define XAXIDMA_BD_CTRL_ALL_MASK        0x0C000000 /* All control bits */
  42
  43 #define XAXIDMA_DELAY_MASK              0xFF000000 /* Delay timeout counter */
  44 #define XAXIDMA_COALESCE_MASK           0x00FF0000 /* Coalesce counter */
  45
  46 #define XAXIDMA_DELAY_SHIFT             24
  47 #define XAXIDMA_COALESCE_SHIFT          16
  48
  49 #define XAXIDMA_IRQ_IOC_MASK            0x00001000 /* Completion intr */
  50 #define XAXIDMA_IRQ_DELAY_MASK          0x00002000 /* Delay interrupt */
  51 #define XAXIDMA_IRQ_ERROR_MASK          0x00004000 /* Error interrupt */
  52 #define XAXIDMA_IRQ_ALL_MASK            0x00007000 /* All interrupts */
  53
  54 /* Default TX/RX Threshold and waitbound values for SGDMA mode */
  55 #define XAXIDMA_DFT_TX_THRESHOLD        24
  56 #define XAXIDMA_DFT_TX_WAITBOUND        254
  57 #define XAXIDMA_DFT_RX_THRESHOLD        24
  58 #define XAXIDMA_DFT_RX_WAITBOUND        254
  59
  60 #define XAXIDMA_BD_STS_ACTUAL_LEN_MASK  0x007FFFFF /* Actual len */
  61 #define XAXIDMA_BD_STS_COMPLETE_MASK    0x80000000 /* Completed */
  62 #define XAXIDMA_BD_STS_DEC_ERR_MASK     0x40000000 /* Decode error */
  63 #define XAXIDMA_BD_STS_SLV_ERR_MASK     0x20000000 /* Slave error */
  64 #define XAXIDMA_BD_STS_INT_ERR_MASK     0x10000000 /* Internal err */
  65 #define XAXIDMA_BD_STS_ALL_ERR_MASK     0x70000000 /* All errors */
  66 #define XAXIDMA_BD_STS_RXSOF_MASK       0x08000000 /* First rx pkt */
  67 #define XAXIDMA_BD_STS_RXEOF_MASK       0x04000000 /* Last rx pkt */
  68 #define XAXIDMA_BD_STS_ALL_MASK         0xFC000000 /* All status bits */
  69
  70 #define NIXGE_REG_CTRL_OFFSET   0x4000
  71 #define NIXGE_REG_INFO          0x00
  72 #define NIXGE_REG_MAC_CTL       0x04
  73 #define NIXGE_REG_PHY_CTL       0x08
  74 #define NIXGE_REG_LED_CTL       0x0c
  75 #define NIXGE_REG_MDIO_DATA     0x10
  76 #define NIXGE_REG_MDIO_ADDR     0x14
  77 #define NIXGE_REG_MDIO_OP       0x18
  78 #define NIXGE_REG_MDIO_CTRL     0x1c
  79
  80 #define NIXGE_ID_LED_CTL_EN     BIT(0)
  81 #define NIXGE_ID_LED_CTL_VAL    BIT(1)
  82
  83 #define NIXGE_MDIO_CLAUSE45     BIT(12)
  84 #define NIXGE_MDIO_CLAUSE22     0
  85 #define NIXGE_MDIO_OP(n)     (((n) & 0x3) << 10)
  86 #define NIXGE_MDIO_OP_ADDRESS   0
  87 #define NIXGE_MDIO_C45_WRITE    BIT(0)
  88 #define NIXGE_MDIO_C45_READ     (BIT(1) | BIT(0))
  89 #define NIXGE_MDIO_C22_WRITE    BIT(0)
  90 #define NIXGE_MDIO_C22_READ     BIT(1)
  91 #define NIXGE_MDIO_ADDR(n)   (((n) & 0x1f) << 5)
  92 #define NIXGE_MDIO_MMD(n)    (((n) & 0x1f) << 0)
  93
  94 #define NIXGE_REG_MAC_LSB       0x1000
  95 #define NIXGE_REG_MAC_MSB       0x1004
  96
  97 /* Packet size info */
  98 #define NIXGE_HDR_SIZE          14 /* Size of Ethernet header */
  99 #define NIXGE_TRL_SIZE          4 /* Size of Ethernet trailer (FCS) */
 100 #define NIXGE_MTU               1500 /* Max MTU of an Ethernet frame */
 101 #define NIXGE_JUMBO_MTU         9000 /* Max MTU of a jumbo Eth. frame */
 102
 103 #define NIXGE_MAX_FRAME_SIZE     (NIXGE_MTU + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE)
 104 #define NIXGE_MAX_JUMBO_FRAME_SIZE \
 105         (NIXGE_JUMBO_MTU + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE)
 106
 107 enum nixge_version {
 108         NIXGE_V2,
 109         NIXGE_V3,
 110         NIXGE_VERSION_COUNT
 111 };
 112
 113 struct nixge_hw_dma_bd {
 114         u32 next_lo;
 115         u32 next_hi;
 116         u32 phys_lo;
 117         u32 phys_hi;
 118         u32 reserved3;
 119         u32 reserved4;
 120         u32 cntrl;
 121         u32 status;
 122         u32 app0;
 123         u32 app1;
 124         u32 app2;
 125         u32 app3;
 126         u32 app4;
 127         u32 sw_id_offset_lo;
 128         u32 sw_id_offset_hi;
 129         u32 reserved6;
 130 };
 131
 132 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 133 #define nixge_hw_dma_bd_set_addr(bd, field, addr) \
 134         do { \
 135                 (bd)->field##_lo = lower_32_bits((addr)); \
 136                 (bd)->field##_hi = upper_32_bits((addr)); \
 137         } while (0)
 138 #else
 139 #define nixge_hw_dma_bd_set_addr(bd, field, addr) \
 140         ((bd)->field##_lo = lower_32_bits((addr)))
 141 #endif
 142
 143 #define nixge_hw_dma_bd_set_phys(bd, addr) \
 144         nixge_hw_dma_bd_set_addr((bd), phys, (addr))
 145
 146 #define nixge_hw_dma_bd_set_next(bd, addr) \
 147         nixge_hw_dma_bd_set_addr((bd), next, (addr))
 148
 149 #define nixge_hw_dma_bd_set_offset(bd, addr) \
 150         nixge_hw_dma_bd_set_addr((bd), sw_id_offset, (addr))
 151
 152 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 153 #define nixge_hw_dma_bd_get_addr(bd, field) \
 154         (dma_addr_t)((((u64)(bd)->field##_hi) << 32) | ((bd)->field##_lo))
 155 #else
 156 #define nixge_hw_dma_bd_get_addr(bd, field) \
 157         (dma_addr_t)((bd)->field##_lo)
 158 #endif
 159
 160 struct nixge_tx_skb {
 161         struct sk_buff *skb;
 162         dma_addr_t mapping;
 163         size_t size;
 164         bool mapped_as_page;
 165 };
 166
 167 struct nixge_priv {
 168         struct net_device *ndev;
 169         struct napi_struct napi;
 170         struct device *dev;
 171
 172         /* Connection to PHY device */
 173         struct device_node *phy_node;
 174         phy_interface_t         phy_mode;
 175
 176         int link;
 177         unsigned int speed;
 178         unsigned int duplex;
 179
 180         /* MDIO bus data */
 181         struct mii_bus *mii_bus;        /* MII bus reference */
 182
 183         /* IO registers, dma functions and IRQs */
 184         void __iomem *ctrl_regs;
 185         void __iomem *dma_regs;
 186
 187         struct tasklet_struct dma_err_tasklet;
 188
 189         int tx_irq;
 190         int rx_irq;
 191
 192         /* Buffer descriptors */
 193         struct nixge_hw_dma_bd *tx_bd_v;
 194         struct nixge_tx_skb *tx_skb;
 195         dma_addr_t tx_bd_p;
 196
 197         struct nixge_hw_dma_bd *rx_bd_v;
 198         dma_addr_t rx_bd_p;
 199         u32 tx_bd_ci;
 200         u32 tx_bd_tail;
 201         u32 rx_bd_ci;
 202
 203         u32 coalesce_count_rx;
 204         u32 coalesce_count_tx;
 205 };
 206
 207 static void nixge_dma_write_reg(struct nixge_priv *priv, off_t offset, u32 val)
 208 {
 209         writel(val, priv->dma_regs + offset);
 210 }
 211
 212 static void nixge_dma_write_desc_reg(struct nixge_priv *priv, off_t offset,
 213                                      dma_addr_t addr)
 214 {
 215         writel(lower_32_bits(addr), priv->dma_regs + offset);
 216 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 217         writel(upper_32_bits(addr), priv->dma_regs + offset + 4);
 218 #endif
 219 }
 220
 221 static u32 nixge_dma_read_reg(const struct nixge_priv *priv, off_t offset)
 222 {
 223         return readl(priv->dma_regs + offset);
 224 }
 225
 226 static void nixge_ctrl_write_reg(struct nixge_priv *priv, off_t offset, u32 val)
 227 {
 228         writel(val, priv->ctrl_regs + offset);
 229 }
 230
 231 static u32 nixge_ctrl_read_reg(struct nixge_priv *priv, off_t offset)
 232 {
 233         return readl(priv->ctrl_regs + offset);
 234 }
 235
 236 #define nixge_ctrl_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \
 237         readl_poll_timeout((priv)->ctrl_regs + (addr), (val), (cond), \
 238                            (sleep_us), (timeout_us))
 239
 240 #define nixge_dma_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \
 241         readl_poll_timeout((priv)->dma_regs + (addr), (val), (cond), \
 242                            (sleep_us), (timeout_us))
 243
 244 static void nixge_hw_dma_bd_release(struct net_device *ndev)
 245 {
 246         struct nixge_priv *priv = netdev_priv(ndev);
 247         dma_addr_t phys_addr;
 248         struct sk_buff *skb;
 249         int i;
 250
 251         if (priv->rx_bd_v) {
 252                 for (i = 0; i < RX_BD_NUM; i++) {
 253                         phys_addr = nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[i],
 254                                                              phys);
 255
 256                         dma_unmap_single(ndev->dev.parent, phys_addr,
 257                                          NIXGE_MAX_JUMBO_FRAME_SIZE,
 258                                          DMA_FROM_DEVICE);
 259
 260                         skb = (struct sk_buff *)(uintptr_t)
 261                                 nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[i],
 262                                                          sw_id_offset);
 263                         dev_kfree_skb(skb);
 264                 }
 265
 266                 dma_free_coherent(ndev->dev.parent,
 267                                   sizeof(*priv->rx_bd_v) * RX_BD_NUM,
 268                                   priv->rx_bd_v,
 269                                   priv->rx_bd_p);
 270         }
 271
 272         if (priv->tx_skb)
 273                 devm_kfree(ndev->dev.parent, priv->tx_skb);
 274
 275         if (priv->tx_bd_v)
 276                 dma_free_coherent(ndev->dev.parent,
 277                                   sizeof(*priv->tx_bd_v) * TX_BD_NUM,
 278                                   priv->tx_bd_v,
 279                                   priv->tx_bd_p);
 280 }
 281
 282 static int nixge_hw_dma_bd_init(struct net_device *ndev)
 283 {
 284         struct nixge_priv *priv = netdev_priv(ndev);
 285         struct sk_buff *skb;
 286         dma_addr_t phys;
 287         u32 cr;
 288         int i;
 289
 290         /* Reset the indexes which are used for accessing the BDs */
 291         priv->tx_bd_ci = 0;
 292         priv->tx_bd_tail = 0;
 293         priv->rx_bd_ci = 0;
 294
 295         /* Allocate the Tx and Rx buffer descriptors. */
 296         priv->tx_bd_v = dma_alloc_coherent(ndev->dev.parent,
 297                                            sizeof(*priv->tx_bd_v) * TX_BD_NUM,
 298                                            &priv->tx_bd_p, GFP_KERNEL);
 299         if (!priv->tx_bd_v)
 300                 goto out;
 301
 302         priv->tx_skb = devm_kcalloc(ndev->dev.parent,
 303                                     TX_BD_NUM, sizeof(*priv->tx_skb),
 304                                     GFP_KERNEL);
 305         if (!priv->tx_skb)
 306                 goto out;
 307
 308         priv->rx_bd_v = dma_alloc_coherent(ndev->dev.parent,
 309                                            sizeof(*priv->rx_bd_v) * RX_BD_NUM,
 310                                            &priv->rx_bd_p, GFP_KERNEL);
 311         if (!priv->rx_bd_v)
 312                 goto out;
 313
 314         for (i = 0; i < TX_BD_NUM; i++) {
 315                 nixge_hw_dma_bd_set_next(&priv->tx_bd_v[i],
 316                                          priv->tx_bd_p +
 317                                          sizeof(*priv->tx_bd_v) *
 318                                          ((i + 1) % TX_BD_NUM));
 319         }
 320
 321         for (i = 0; i < RX_BD_NUM; i++) {
 322                 nixge_hw_dma_bd_set_next(&priv->rx_bd_v[i],
 323                                          priv->rx_bd_p
 324                                          + sizeof(*priv->rx_bd_v) *
 325                                          ((i + 1) % RX_BD_NUM));
 326
 327                 skb = __netdev_alloc_skb_ip_align(ndev,
 328                                                   NIXGE_MAX_JUMBO_FRAME_SIZE,
 329                                                   GFP_KERNEL);
 330                 if (!skb)
 331                         goto out;
 332
 333                 nixge_hw_dma_bd_set_offset(&priv->rx_bd_v[i], (uintptr_t)skb);
 334                 phys = dma_map_single(ndev->dev.parent, skb->data,
 335                                       NIXGE_MAX_JUMBO_FRAME_SIZE,
 336                                       DMA_FROM_DEVICE);
 337
 338                 nixge_hw_dma_bd_set_phys(&priv->rx_bd_v[i], phys);
 339
 340                 priv->rx_bd_v[i].cntrl = NIXGE_MAX_JUMBO_FRAME_SIZE;
 341         }
 342
 343         /* Start updating the Rx channel control register */
 344         cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
 345         /* Update the interrupt coalesce count */
 346         cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
 347               ((priv->coalesce_count_rx) << XAXIDMA_COALESCE_SHIFT));
 348         /* Update the delay timer count */
 349         cr = ((cr & ~XAXIDMA_DELAY_MASK) |
 350               (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
 351         /* Enable coalesce, delay timer and error interrupts */
 352         cr |= XAXIDMA_IRQ_ALL_MASK;
 353         /* Write to the Rx channel control register */
 354         nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
 355
 356         /* Start updating the Tx channel control register */
 357         cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
 358         /* Update the interrupt coalesce count */
 359         cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
 360               ((priv->coalesce_count_tx) << XAXIDMA_COALESCE_SHIFT));
 361         /* Update the delay timer count */
 362         cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
 363               (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
 364         /* Enable coalesce, delay timer and error interrupts */
 365         cr |= XAXIDMA_IRQ_ALL_MASK;
 366         /* Write to the Tx channel control register */
 367         nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, cr);
 368
 369         /* Populate the tail pointer and bring the Rx Axi DMA engine out of
 370          * halted state. This will make the Rx side ready for reception.
 371          */
 372         nixge_dma_write_desc_reg(priv, XAXIDMA_RX_CDESC_OFFSET, priv->rx_bd_p);
 373         cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
 374         nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET,
 375                             cr | XAXIDMA_CR_RUNSTOP_MASK);
 376         nixge_dma_write_desc_reg(priv, XAXIDMA_RX_TDESC_OFFSET, priv->rx_bd_p +
 377                             (sizeof(*priv->rx_bd_v) * (RX_BD_NUM - 1)));
 378
 379         /* Write to the RS (Run-stop) bit in the Tx channel control register.
 380          * Tx channel is now ready to run. But only after we write to the
 381          * tail pointer register that the Tx channel will start transmitting.
 382          */
 383         nixge_dma_write_desc_reg(priv, XAXIDMA_TX_CDESC_OFFSET, priv->tx_bd_p);
 384         cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
 385         nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET,
 386                             cr | XAXIDMA_CR_RUNSTOP_MASK);
 387
 388         return 0;
 389 out:
 390         nixge_hw_dma_bd_release(ndev);
 391         return -ENOMEM;
 392 }
 393
 394 static void __nixge_device_reset(struct nixge_priv *priv, off_t offset)
 395 {
 396         u32 status;
 397         int err;
 398
 399         /* Reset Axi DMA. This would reset NIXGE Ethernet core as well.
 400          * The reset process of Axi DMA takes a while to complete as all
 401          * pending commands/transfers will be flushed or completed during
 402          * this reset process.
 403          */
 404         nixge_dma_write_reg(priv, offset, XAXIDMA_CR_RESET_MASK);
 405         err = nixge_dma_poll_timeout(priv, offset, status,
 406                                      !(status & XAXIDMA_CR_RESET_MASK), 10,
 407                                      1000);
 408         if (err)
 409                 netdev_err(priv->ndev, "%s: DMA reset timeout!\n", __func__);
 410 }
 411
 412 static void nixge_device_reset(struct net_device *ndev)
 413 {
 414         struct nixge_priv *priv = netdev_priv(ndev);
 415
 416         __nixge_device_reset(priv, XAXIDMA_TX_CR_OFFSET);
 417         __nixge_device_reset(priv, XAXIDMA_RX_CR_OFFSET);
 418
 419         if (nixge_hw_dma_bd_init(ndev))
 420                 netdev_err(ndev, "%s: descriptor allocation failed\n",
 421                            __func__);
 422
 423         netif_trans_update(ndev);
 424 }
 425
 426 static void nixge_handle_link_change(struct net_device *ndev)
 427 {
 428         struct nixge_priv *priv = netdev_priv(ndev);
 429         struct phy_device *phydev = ndev->phydev;
 430
 431         if (phydev->link != priv->link || phydev->speed != priv->speed ||
 432             phydev->duplex != priv->duplex) {
 433                 priv->link = phydev->link;
 434                 priv->speed = phydev->speed;
 435                 priv->duplex = phydev->duplex;
 436                 phy_print_status(phydev);
 437         }
 438 }
 439
 440 static void nixge_tx_skb_unmap(struct nixge_priv *priv,
 441                                struct nixge_tx_skb *tx_skb)
 442 {
 443         if (tx_skb->mapping) {
 444                 if (tx_skb->mapped_as_page)
 445                         dma_unmap_page(priv->ndev->dev.parent, tx_skb->mapping,
 446                                        tx_skb->size, DMA_TO_DEVICE);
 447                 else
 448                         dma_unmap_single(priv->ndev->dev.parent,
 449                                          tx_skb->mapping,
 450                                          tx_skb->size, DMA_TO_DEVICE);
 451                 tx_skb->mapping = 0;
 452         }
 453
 454         if (tx_skb->skb) {
 455                 dev_kfree_skb_any(tx_skb->skb);
 456                 tx_skb->skb = NULL;
 457         }
 458 }
 459
 460 static void nixge_start_xmit_done(struct net_device *ndev)
 461 {
 462         struct nixge_priv *priv = netdev_priv(ndev);
 463         struct nixge_hw_dma_bd *cur_p;
 464         struct nixge_tx_skb *tx_skb;
 465         unsigned int status = 0;
 466         u32 packets = 0;
 467         u32 size = 0;
 468
 469         cur_p = &priv->tx_bd_v[priv->tx_bd_ci];
 470         tx_skb = &priv->tx_skb[priv->tx_bd_ci];
 471
 472         status = cur_p->status;
 473
 474         while (status & XAXIDMA_BD_STS_COMPLETE_MASK) {
 475                 nixge_tx_skb_unmap(priv, tx_skb);
 476                 cur_p->status = 0;
 477
 478                 size += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
 479                 packets++;
 480
 481                 ++priv->tx_bd_ci;
 482                 priv->tx_bd_ci %= TX_BD_NUM;
 483                 cur_p = &priv->tx_bd_v[priv->tx_bd_ci];
 484                 tx_skb = &priv->tx_skb[priv->tx_bd_ci];
 485                 status = cur_p->status;
 486         }
 487
 488         ndev->stats.tx_packets += packets;
 489         ndev->stats.tx_bytes += size;
 490
 491         if (packets)
 492                 netif_wake_queue(ndev);
 493 }
 494
 495 static int nixge_check_tx_bd_space(struct nixge_priv *priv,
 496                                    int num_frag)
 497 {
 498         struct nixge_hw_dma_bd *cur_p;
 499
 500         cur_p = &priv->tx_bd_v[(priv->tx_bd_tail + num_frag) % TX_BD_NUM];
 501         if (cur_p->status & XAXIDMA_BD_STS_ALL_MASK)
 502                 return NETDEV_TX_BUSY;
 503         return 0;
 504 }
 505
 506 static netdev_tx_t nixge_start_xmit(struct sk_buff *skb,
 507                                     struct net_device *ndev)
 508 {
 509         struct nixge_priv *priv = netdev_priv(ndev);
 510         struct nixge_hw_dma_bd *cur_p;
 511         struct nixge_tx_skb *tx_skb;
 512         dma_addr_t tail_p, cur_phys;
 513         skb_frag_t *frag;
 514         u32 num_frag;
 515         u32 ii;
 516
 517         num_frag = skb_shinfo(skb)->nr_frags;
 518         cur_p = &priv->tx_bd_v[priv->tx_bd_tail];
 519         tx_skb = &priv->tx_skb[priv->tx_bd_tail];
 520
 521         if (nixge_check_tx_bd_space(priv, num_frag)) {
 522                 if (!netif_queue_stopped(ndev))
 523                         netif_stop_queue(ndev);
 524                 return NETDEV_TX_OK;
 525         }
 526
 527         cur_phys = dma_map_single(ndev->dev.parent, skb->data,
 528                                   skb_headlen(skb), DMA_TO_DEVICE);
 529         if (dma_mapping_error(ndev->dev.parent, cur_phys))
 530                 goto drop;
 531         nixge_hw_dma_bd_set_phys(cur_p, cur_phys);
 532
 533         cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
 534
 535         tx_skb->skb = NULL;
 536         tx_skb->mapping = cur_phys;
 537         tx_skb->size = skb_headlen(skb);
 538         tx_skb->mapped_as_page = false;
 539
 540         for (ii = 0; ii < num_frag; ii++) {
 541                 ++priv->tx_bd_tail;
 542                 priv->tx_bd_tail %= TX_BD_NUM;
 543                 cur_p = &priv->tx_bd_v[priv->tx_bd_tail];
 544                 tx_skb = &priv->tx_skb[priv->tx_bd_tail];
 545                 frag = &skb_shinfo(skb)->frags[ii];
 546
 547                 cur_phys = skb_frag_dma_map(ndev->dev.parent, frag, 0,
 548                                             skb_frag_size(frag),
 549                                             DMA_TO_DEVICE);
 550                 if (dma_mapping_error(ndev->dev.parent, cur_phys))
 551                         goto frag_err;
 552                 nixge_hw_dma_bd_set_phys(cur_p, cur_phys);
 553
 554                 cur_p->cntrl = skb_frag_size(frag);
 555
 556                 tx_skb->skb = NULL;
 557                 tx_skb->mapping = cur_phys;
 558                 tx_skb->size = skb_frag_size(frag);
 559                 tx_skb->mapped_as_page = true;
 560         }
 561
 562         /* last buffer of the frame */
 563         tx_skb->skb = skb;
 564
 565         cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK;
 566
 567         tail_p = priv->tx_bd_p + sizeof(*priv->tx_bd_v) * priv->tx_bd_tail;
 568         /* Start the transfer */
 569         nixge_dma_write_desc_reg(priv, XAXIDMA_TX_TDESC_OFFSET, tail_p);
 570         ++priv->tx_bd_tail;
 571         priv->tx_bd_tail %= TX_BD_NUM;
 572
 573         return NETDEV_TX_OK;
 574 frag_err:
 575         for (; ii > 0; ii--) {
 576                 if (priv->tx_bd_tail)
 577                         priv->tx_bd_tail--;
 578                 else
 579                         priv->tx_bd_tail = TX_BD_NUM - 1;
 580
 581                 tx_skb = &priv->tx_skb[priv->tx_bd_tail];
 582                 nixge_tx_skb_unmap(priv, tx_skb);
 583
 584                 cur_p = &priv->tx_bd_v[priv->tx_bd_tail];
 585                 cur_p->status = 0;
 586         }
 587         dma_unmap_single(priv->ndev->dev.parent,
 588                          tx_skb->mapping,
 589                          tx_skb->size, DMA_TO_DEVICE);
 590 drop:
 591         ndev->stats.tx_dropped++;
 592         return NETDEV_TX_OK;
 593 }
 594
 595 static int nixge_recv(struct net_device *ndev, int budget)
 596 {
 597         struct nixge_priv *priv = netdev_priv(ndev);
 598         struct sk_buff *skb, *new_skb;
 599         struct nixge_hw_dma_bd *cur_p;
 600         dma_addr_t tail_p = 0, cur_phys = 0;
 601         u32 packets = 0;
 602         u32 length = 0;
 603         u32 size = 0;
 604
 605         cur_p = &priv->rx_bd_v[priv->rx_bd_ci];
 606
 607         while ((cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK &&
 608                 budget > packets)) {
 609                 tail_p = priv->rx_bd_p + sizeof(*priv->rx_bd_v) *
 610                          priv->rx_bd_ci;
 611
 612                 skb = (struct sk_buff *)(uintptr_t)
 613                         nixge_hw_dma_bd_get_addr(cur_p, sw_id_offset);
 614
 615                 length = cur_p->status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
 616                 if (length > NIXGE_MAX_JUMBO_FRAME_SIZE)
 617                         length = NIXGE_MAX_JUMBO_FRAME_SIZE;
 618
 619                 dma_unmap_single(ndev->dev.parent,
 620                                  nixge_hw_dma_bd_get_addr(cur_p, phys),
 621                                  NIXGE_MAX_JUMBO_FRAME_SIZE,
 622                                  DMA_FROM_DEVICE);
 623
 624                 skb_put(skb, length);
 625
 626                 skb->protocol = eth_type_trans(skb, ndev);
 627                 skb_checksum_none_assert(skb);
 628
 629                 /* For now mark them as CHECKSUM_NONE since
 630                  * we don't have offload capabilities
 631                  */
 632                 skb->ip_summed = CHECKSUM_NONE;
 633
 634                 napi_gro_receive(&priv->napi, skb);
 635
 636                 size += length;
 637                 packets++;
 638
 639                 new_skb = netdev_alloc_skb_ip_align(ndev,
 640                                                     NIXGE_MAX_JUMBO_FRAME_SIZE);
 641                 if (!new_skb)
 642                         return packets;
 643
 644                 cur_phys = dma_map_single(ndev->dev.parent, new_skb->data,
 645                                           NIXGE_MAX_JUMBO_FRAME_SIZE,
 646                                           DMA_FROM_DEVICE);
 647                 if (dma_mapping_error(ndev->dev.parent, cur_phys)) {
 648                         /* FIXME: bail out and clean up */
 649                         netdev_err(ndev, "Failed to map ...\n");
 650                 }
 651                 nixge_hw_dma_bd_set_phys(cur_p, cur_phys);
 652                 cur_p->cntrl = NIXGE_MAX_JUMBO_FRAME_SIZE;
 653                 cur_p->status = 0;
 654                 nixge_hw_dma_bd_set_offset(cur_p, (uintptr_t)new_skb);
 655
 656                 ++priv->rx_bd_ci;
 657                 priv->rx_bd_ci %= RX_BD_NUM;
 658                 cur_p = &priv->rx_bd_v[priv->rx_bd_ci];
 659         }
 660
 661         ndev->stats.rx_packets += packets;
 662         ndev->stats.rx_bytes += size;
 663
 664         if (tail_p)
 665                 nixge_dma_write_desc_reg(priv, XAXIDMA_RX_TDESC_OFFSET, tail_p);
 666
 667         return packets;
 668 }
 669
 670 static int nixge_poll(struct napi_struct *napi, int budget)
 671 {
 672         struct nixge_priv *priv = container_of(napi, struct nixge_priv, napi);
 673         int work_done;
 674         u32 status, cr;
 675
 676         work_done = 0;
 677
 678         work_done = nixge_recv(priv->ndev, budget);
 679         if (work_done < budget) {
 680                 napi_complete_done(napi, work_done);
 681                 status = nixge_dma_read_reg(priv, XAXIDMA_RX_SR_OFFSET);
 682
 683                 if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
 684                         /* If there's more, reschedule, but clear */
 685                         nixge_dma_write_reg(priv, XAXIDMA_RX_SR_OFFSET, status);
 686                         napi_schedule(napi);
 687                 } else {
 688                         /* if not, turn on RX IRQs again ... */
 689                         cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
 690                         cr |= (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
 691                         nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
 692                 }
 693         }
 694
 695         return work_done;
 696 }
 697
 698 static irqreturn_t nixge_tx_irq(int irq, void *_ndev)
 699 {
 700         struct nixge_priv *priv = netdev_priv(_ndev);
 701         struct net_device *ndev = _ndev;
 702         unsigned int status;
 703         dma_addr_t phys;
 704         u32 cr;
 705
 706         status = nixge_dma_read_reg(priv, XAXIDMA_TX_SR_OFFSET);
 707         if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
 708                 nixge_dma_write_reg(priv, XAXIDMA_TX_SR_OFFSET, status);
 709                 nixge_start_xmit_done(priv->ndev);
 710                 goto out;
 711         }
 712         if (!(status & XAXIDMA_IRQ_ALL_MASK)) {
 713                 netdev_err(ndev, "No interrupts asserted in Tx path\n");
 714                 return IRQ_NONE;
 715         }
 716         if (status & XAXIDMA_IRQ_ERROR_MASK) {
 717                 phys = nixge_hw_dma_bd_get_addr(&priv->tx_bd_v[priv->tx_bd_ci],
 718                                                 phys);
 719
 720                 netdev_err(ndev, "DMA Tx error 0x%x\n", status);
 721                 netdev_err(ndev, "Current BD is at: 0x%llx\n", (u64)phys);
 722
 723                 cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
 724                 /* Disable coalesce, delay timer and error interrupts */
 725                 cr &= (~XAXIDMA_IRQ_ALL_MASK);
 726                 /* Write to the Tx channel control register */
 727                 nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, cr);
 728
 729                 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
 730                 /* Disable coalesce, delay timer and error interrupts */
 731                 cr &= (~XAXIDMA_IRQ_ALL_MASK);
 732                 /* Write to the Rx channel control register */
 733                 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
 734
 735                 tasklet_schedule(&priv->dma_err_tasklet);
 736                 nixge_dma_write_reg(priv, XAXIDMA_TX_SR_OFFSET, status);
 737         }
 738 out:
 739         return IRQ_HANDLED;
 740 }
 741
 742 static irqreturn_t nixge_rx_irq(int irq, void *_ndev)
 743 {
 744         struct nixge_priv *priv = netdev_priv(_ndev);
 745         struct net_device *ndev = _ndev;
 746         unsigned int status;
 747         dma_addr_t phys;
 748         u32 cr;
 749
 750         status = nixge_dma_read_reg(priv, XAXIDMA_RX_SR_OFFSET);
 751         if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
 752                 /* Turn of IRQs because NAPI */
 753                 nixge_dma_write_reg(priv, XAXIDMA_RX_SR_OFFSET, status);
 754                 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
 755                 cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
 756                 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
 757
 758                 napi_schedule(&priv->napi);
 759                 goto out;
 760         }
 761         if (!(status & XAXIDMA_IRQ_ALL_MASK)) {
 762                 netdev_err(ndev, "No interrupts asserted in Rx path\n");
 763                 return IRQ_NONE;
 764         }
 765         if (status & XAXIDMA_IRQ_ERROR_MASK) {
 766                 phys = nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[priv->rx_bd_ci],
 767                                                 phys);
 768                 netdev_err(ndev, "DMA Rx error 0x%x\n", status);
 769                 netdev_err(ndev, "Current BD is at: 0x%llx\n", (u64)phys);
 770
 771                 cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
 772                 /* Disable coalesce, delay timer and error interrupts */
 773                 cr &= (~XAXIDMA_IRQ_ALL_MASK);
 774                 /* Finally write to the Tx channel control register */
 775                 nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, cr);
 776
 777                 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
 778                 /* Disable coalesce, delay timer and error interrupts */
 779                 cr &= (~XAXIDMA_IRQ_ALL_MASK);
 780                 /* write to the Rx channel control register */
 781                 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr);
 782
 783                 tasklet_schedule(&priv->dma_err_tasklet);
 784                 nixge_dma_write_reg(priv, XAXIDMA_RX_SR_OFFSET, status);
 785         }
 786 out:
 787         return IRQ_HANDLED;
 788 }
 789
 790 static void nixge_dma_err_handler(struct tasklet_struct *t)
 791 {
 792         struct nixge_priv *lp = from_tasklet(lp, t, dma_err_tasklet);
 793         struct nixge_hw_dma_bd *cur_p;
 794         struct nixge_tx_skb *tx_skb;
 795         u32 cr, i;
 796
 797         __nixge_device_reset(lp, XAXIDMA_TX_CR_OFFSET);
 798         __nixge_device_reset(lp, XAXIDMA_RX_CR_OFFSET);
 799
 800         for (i = 0; i < TX_BD_NUM; i++) {
 801                 cur_p = &lp->tx_bd_v[i];
 802                 tx_skb = &lp->tx_skb[i];
 803                 nixge_tx_skb_unmap(lp, tx_skb);
 804
 805                 nixge_hw_dma_bd_set_phys(cur_p, 0);
 806                 cur_p->cntrl = 0;
 807                 cur_p->status = 0;
 808                 nixge_hw_dma_bd_set_offset(cur_p, 0);
 809         }
 810
 811         for (i = 0; i < RX_BD_NUM; i++) {
 812                 cur_p = &lp->rx_bd_v[i];
 813                 cur_p->status = 0;
 814         }
 815
 816         lp->tx_bd_ci = 0;
 817         lp->tx_bd_tail = 0;
 818         lp->rx_bd_ci = 0;
 819
 820         /* Start updating the Rx channel control register */
 821         cr = nixge_dma_read_reg(lp, XAXIDMA_RX_CR_OFFSET);
 822         /* Update the interrupt coalesce count */
 823         cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
 824               (XAXIDMA_DFT_RX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
 825         /* Update the delay timer count */
 826         cr = ((cr & ~XAXIDMA_DELAY_MASK) |
 827               (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
 828         /* Enable coalesce, delay timer and error interrupts */
 829         cr |= XAXIDMA_IRQ_ALL_MASK;
 830         /* Finally write to the Rx channel control register */
 831         nixge_dma_write_reg(lp, XAXIDMA_RX_CR_OFFSET, cr);
 832
 833         /* Start updating the Tx channel control register */
 834         cr = nixge_dma_read_reg(lp, XAXIDMA_TX_CR_OFFSET);
 835         /* Update the interrupt coalesce count */
 836         cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
 837               (XAXIDMA_DFT_TX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
 838         /* Update the delay timer count */
 839         cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
 840               (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
 841         /* Enable coalesce, delay timer and error interrupts */
 842         cr |= XAXIDMA_IRQ_ALL_MASK;
 843         /* Finally write to the Tx channel control register */
 844         nixge_dma_write_reg(lp, XAXIDMA_TX_CR_OFFSET, cr);
 845
 846         /* Populate the tail pointer and bring the Rx Axi DMA engine out of
 847          * halted state. This will make the Rx side ready for reception.
 848          */
 849         nixge_dma_write_desc_reg(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
 850         cr = nixge_dma_read_reg(lp, XAXIDMA_RX_CR_OFFSET);
 851         nixge_dma_write_reg(lp, XAXIDMA_RX_CR_OFFSET,
 852                             cr | XAXIDMA_CR_RUNSTOP_MASK);
 853         nixge_dma_write_desc_reg(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
 854                             (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
 855
 856         /* Write to the RS (Run-stop) bit in the Tx channel control register.
 857          * Tx channel is now ready to run. But only after we write to the
 858          * tail pointer register that the Tx channel will start transmitting
 859          */
 860         nixge_dma_write_desc_reg(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
 861         cr = nixge_dma_read_reg(lp, XAXIDMA_TX_CR_OFFSET);
 862         nixge_dma_write_reg(lp, XAXIDMA_TX_CR_OFFSET,
 863                             cr | XAXIDMA_CR_RUNSTOP_MASK);
 864 }
 865
 866 static int nixge_open(struct net_device *ndev)
 867 {
 868         struct nixge_priv *priv = netdev_priv(ndev);
 869         struct phy_device *phy;
 870         int ret;
 871
 872         nixge_device_reset(ndev);
 873
 874         phy = of_phy_connect(ndev, priv->phy_node,
 875                              &nixge_handle_link_change, 0, priv->phy_mode);
 876         if (!phy)
 877                 return -ENODEV;
 878
 879         phy_start(phy);
 880
 881         /* Enable tasklets for Axi DMA error handling */
 882         tasklet_setup(&priv->dma_err_tasklet, nixge_dma_err_handler);
 883
 884         napi_enable(&priv->napi);
 885
 886         /* Enable interrupts for Axi DMA Tx */
 887         ret = request_irq(priv->tx_irq, nixge_tx_irq, 0, ndev->name, ndev);
 888         if (ret)
 889                 goto err_tx_irq;
 890         /* Enable interrupts for Axi DMA Rx */
 891         ret = request_irq(priv->rx_irq, nixge_rx_irq, 0, ndev->name, ndev);
 892         if (ret)
 893                 goto err_rx_irq;
 894
 895         netif_start_queue(ndev);
 896
 897         return 0;
 898
 899 err_rx_irq:
 900         free_irq(priv->tx_irq, ndev);
 901 err_tx_irq:
 902         napi_disable(&priv->napi);
 903         phy_stop(phy);
 904         phy_disconnect(phy);
 905         tasklet_kill(&priv->dma_err_tasklet);
 906         netdev_err(ndev, "request_irq() failed\n");
 907         return ret;
 908 }
 909
 910 static int nixge_stop(struct net_device *ndev)
 911 {
 912         struct nixge_priv *priv = netdev_priv(ndev);
 913         u32 cr;
 914
 915         netif_stop_queue(ndev);
 916         napi_disable(&priv->napi);
 917
 918         if (ndev->phydev) {
 919                 phy_stop(ndev->phydev);
 920                 phy_disconnect(ndev->phydev);
 921         }
 922
 923         cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
 924         nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET,
 925                             cr & (~XAXIDMA_CR_RUNSTOP_MASK));
 926         cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
 927         nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET,
 928                             cr & (~XAXIDMA_CR_RUNSTOP_MASK));
 929
 930         tasklet_kill(&priv->dma_err_tasklet);
 931
 932         free_irq(priv->tx_irq, ndev);
 933         free_irq(priv->rx_irq, ndev);
 934
 935         nixge_hw_dma_bd_release(ndev);
 936
 937         return 0;
 938 }
 939
 940 static int nixge_change_mtu(struct net_device *ndev, int new_mtu)
 941 {
 942         if (netif_running(ndev))
 943                 return -EBUSY;
 944
 945         if ((new_mtu + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE) >
 946              NIXGE_MAX_JUMBO_FRAME_SIZE)
 947                 return -EINVAL;
 948
 949         ndev->mtu = new_mtu;
 950
 951         return 0;
 952 }
 953
 954 static s32 __nixge_hw_set_mac_address(struct net_device *ndev)
 955 {
 956         struct nixge_priv *priv = netdev_priv(ndev);
 957
 958         nixge_ctrl_write_reg(priv, NIXGE_REG_MAC_LSB,
 959                              (ndev->dev_addr[2]) << 24 |
 960                              (ndev->dev_addr[3] << 16) |
 961                              (ndev->dev_addr[4] << 8) |
 962                              (ndev->dev_addr[5] << 0));
 963
 964         nixge_ctrl_write_reg(priv, NIXGE_REG_MAC_MSB,
 965                              (ndev->dev_addr[1] | (ndev->dev_addr[0] << 8)));
 966
 967         return 0;
 968 }
 969
 970 static int nixge_net_set_mac_address(struct net_device *ndev, void *p)
 971 {
 972         int err;
 973
 974         err = eth_mac_addr(ndev, p);
 975         if (!err)
 976                 __nixge_hw_set_mac_address(ndev);
 977
 978         return err;
 979 }
 980
 981 static const struct net_device_ops nixge_netdev_ops = {
 982         .ndo_open = nixge_open,
 983         .ndo_stop = nixge_stop,
 984         .ndo_start_xmit = nixge_start_xmit,
 985         .ndo_change_mtu = nixge_change_mtu,
 986         .ndo_set_mac_address = nixge_net_set_mac_address,
 987         .ndo_validate_addr = eth_validate_addr,
 988 };
 989
 990 static void nixge_ethtools_get_drvinfo(struct net_device *ndev,
 991                                        struct ethtool_drvinfo *ed)
 992 {
 993         strscpy(ed->driver, "nixge", sizeof(ed->driver));
 994         strscpy(ed->bus_info, "platform", sizeof(ed->bus_info));
 995 }
 996
 997 static int
 998 nixge_ethtools_get_coalesce(struct net_device *ndev,
 999                             struct ethtool_coalesce *ecoalesce,
1000                             struct kernel_ethtool_coalesce *kernel_coal,
1001                             struct netlink_ext_ack *extack)
1002 {
1003         struct nixge_priv *priv = netdev_priv(ndev);
1004         u32 regval = 0;
1005
1006         regval = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
1007         ecoalesce->rx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
1008                                              >> XAXIDMA_COALESCE_SHIFT;
1009         regval = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
1010         ecoalesce->tx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
1011                                              >> XAXIDMA_COALESCE_SHIFT;
1012         return 0;
1013 }
1014
1015 static int
1016 nixge_ethtools_set_coalesce(struct net_device *ndev,
1017                             struct ethtool_coalesce *ecoalesce,
1018                             struct kernel_ethtool_coalesce *kernel_coal,
1019                             struct netlink_ext_ack *extack)
1020 {
1021         struct nixge_priv *priv = netdev_priv(ndev);
1022
1023         if (netif_running(ndev)) {
1024                 netdev_err(ndev,
1025                            "Please stop netif before applying configuration\n");
1026                 return -EBUSY;
1027         }
1028
1029         if (ecoalesce->rx_max_coalesced_frames)
1030                 priv->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames;
1031         if (ecoalesce->tx_max_coalesced_frames)
1032                 priv->coalesce_count_tx = ecoalesce->tx_max_coalesced_frames;
1033
1034         return 0;
1035 }
1036
1037 static int nixge_ethtools_set_phys_id(struct net_device *ndev,
1038                                       enum ethtool_phys_id_state state)
1039 {
1040         struct nixge_priv *priv = netdev_priv(ndev);
1041         u32 ctrl;
1042
1043         ctrl = nixge_ctrl_read_reg(priv, NIXGE_REG_LED_CTL);
1044         switch (state) {
1045         case ETHTOOL_ID_ACTIVE:
1046                 ctrl |= NIXGE_ID_LED_CTL_EN;
1047                 /* Enable identification LED override*/
1048                 nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl);
1049                 return 2;
1050
1051         case ETHTOOL_ID_ON:
1052                 ctrl |= NIXGE_ID_LED_CTL_VAL;
1053                 nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl);
1054                 break;
1055
1056         case ETHTOOL_ID_OFF:
1057                 ctrl &= ~NIXGE_ID_LED_CTL_VAL;
1058                 nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl);
1059                 break;
1060
1061         case ETHTOOL_ID_INACTIVE:
1062                 /* Restore LED settings */
1063                 ctrl &= ~NIXGE_ID_LED_CTL_EN;
1064                 nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl);
1065                 break;
1066         }
1067
1068         return 0;
1069 }
1070
1071 static const struct ethtool_ops nixge_ethtool_ops = {
1072         .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES,
1073         .get_drvinfo    = nixge_ethtools_get_drvinfo,
1074         .get_coalesce   = nixge_ethtools_get_coalesce,
1075         .set_coalesce   = nixge_ethtools_set_coalesce,
1076         .set_phys_id    = nixge_ethtools_set_phys_id,
1077         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
1078         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
1079         .get_link               = ethtool_op_get_link,
1080 };
1081
1082 static int nixge_mdio_read_c22(struct mii_bus *bus, int phy_id, int reg)
1083 {
1084         struct nixge_priv *priv = bus->priv;
1085         u32 status, tmp;
1086         int err;
1087         u16 device;
1088
1089         device = reg & 0x1f;
1090
1091         tmp = NIXGE_MDIO_CLAUSE22 | NIXGE_MDIO_OP(NIXGE_MDIO_C22_READ) |
1092               NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
1093
1094         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
1095         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
1096
1097         err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
1098                                       !status, 10, 1000);
1099         if (err) {
1100                 dev_err(priv->dev, "timeout setting read command");
1101                 return err;
1102         }
1103
1104         status = nixge_ctrl_read_reg(priv, NIXGE_REG_MDIO_DATA);
1105
1106         return status;
1107 }
1108
1109 static int nixge_mdio_read_c45(struct mii_bus *bus, int phy_id, int device,
1110                                int reg)
1111 {
1112         struct nixge_priv *priv = bus->priv;
1113         u32 status, tmp;
1114         int err;
1115
1116         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff);
1117
1118         tmp = NIXGE_MDIO_CLAUSE45 |
1119               NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS) |
1120               NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
1121
1122         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
1123         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
1124
1125         err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
1126                                       !status, 10, 1000);
1127         if (err) {
1128                 dev_err(priv->dev, "timeout setting address");
1129                 return err;
1130         }
1131
1132         tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_C45_READ) |
1133               NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
1134
1135         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
1136         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
1137
1138         err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
1139                                       !status, 10, 1000);
1140         if (err) {
1141                 dev_err(priv->dev, "timeout setting read command");
1142                 return err;
1143         }
1144
1145         status = nixge_ctrl_read_reg(priv, NIXGE_REG_MDIO_DATA);
1146
1147         return status;
1148 }
1149
1150 static int nixge_mdio_write_c22(struct mii_bus *bus, int phy_id, int reg,
1151                                 u16 val)
1152 {
1153         struct nixge_priv *priv = bus->priv;
1154         u32 status, tmp;
1155         u16 device;
1156         int err;
1157
1158         device = reg & 0x1f;
1159
1160         tmp = NIXGE_MDIO_CLAUSE22 | NIXGE_MDIO_OP(NIXGE_MDIO_C22_WRITE) |
1161               NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
1162
1163         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_DATA, val);
1164         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
1165         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
1166
1167         err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
1168                                       !status, 10, 1000);
1169         if (err)
1170                 dev_err(priv->dev, "timeout setting write command");
1171
1172         return err;
1173 }
1174
1175 static int nixge_mdio_write_c45(struct mii_bus *bus, int phy_id,
1176                                 int device, int reg, u16 val)
1177 {
1178         struct nixge_priv *priv = bus->priv;
1179         u32 status, tmp;
1180         int err;
1181
1182         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff);
1183
1184         tmp = NIXGE_MDIO_CLAUSE45 |
1185               NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS) |
1186               NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
1187
1188         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
1189         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
1190
1191         err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
1192                                       !status, 10, 1000);
1193         if (err) {
1194                 dev_err(priv->dev, "timeout setting address");
1195                 return err;
1196         }
1197
1198         tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_C45_WRITE) |
1199               NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
1200
1201         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_DATA, val);
1202         nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
1203
1204         err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
1205                                       !status, 10, 1000);
1206         if (err)
1207                 dev_err(priv->dev, "timeout setting write command");
1208
1209         return err;
1210 }
1211
1212 static int nixge_mdio_setup(struct nixge_priv *priv, struct device_node *np)
1213 {
1214         struct mii_bus *bus;
1215
1216         bus = devm_mdiobus_alloc(priv->dev);
1217         if (!bus)
1218                 return -ENOMEM;
1219
1220         snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(priv->dev));
1221         bus->priv = priv;
1222         bus->name = "nixge_mii_bus";
1223         bus->read = nixge_mdio_read_c22;
1224         bus->write = nixge_mdio_write_c22;
1225         bus->read_c45 = nixge_mdio_read_c45;
1226         bus->write_c45 = nixge_mdio_write_c45;
1227         bus->parent = priv->dev;
1228
1229         priv->mii_bus = bus;
1230
1231         return of_mdiobus_register(bus, np);
1232 }
1233
1234 static void *nixge_get_nvmem_address(struct device *dev)
1235 {
1236         struct nvmem_cell *cell;
1237         size_t cell_size;
1238         char *mac;
1239
1240         cell = nvmem_cell_get(dev, "address");
1241         if (IS_ERR(cell))
1242                 return cell;
1243
1244         mac = nvmem_cell_read(cell, &cell_size);
1245         nvmem_cell_put(cell);
1246
1247         return mac;
1248 }
1249
1250 /* Match table for of_platform binding */
1251 static const struct of_device_id nixge_dt_ids[] = {
1252         { .compatible = "ni,xge-enet-2.00", .data = (void *)NIXGE_V2 },
1253         { .compatible = "ni,xge-enet-3.00", .data = (void *)NIXGE_V3 },
1254         {},
1255 };
1256 MODULE_DEVICE_TABLE(of, nixge_dt_ids);
1257
1258 static int nixge_of_get_resources(struct platform_device *pdev)
1259 {
1260         const struct of_device_id *of_id;
1261         enum nixge_version version;
1262         struct net_device *ndev;
1263         struct nixge_priv *priv;
1264
1265         ndev = platform_get_drvdata(pdev);
1266         priv = netdev_priv(ndev);
1267         of_id = of_match_node(nixge_dt_ids, pdev->dev.of_node);
1268         if (!of_id)
1269                 return -ENODEV;
1270
1271         version = (enum nixge_version)of_id->data;
1272         if (version <= NIXGE_V2)
1273                 priv->dma_regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
1274         else
1275                 priv->dma_regs = devm_platform_ioremap_resource_byname(pdev, "dma");
1276         if (IS_ERR(priv->dma_regs)) {
1277                 netdev_err(ndev, "failed to map dma regs\n");
1278                 return PTR_ERR(priv->dma_regs);
1279         }
1280         if (version <= NIXGE_V2)
1281                 priv->ctrl_regs = priv->dma_regs + NIXGE_REG_CTRL_OFFSET;
1282         else
1283                 priv->ctrl_regs = devm_platform_ioremap_resource_byname(pdev, "ctrl");
1284         if (IS_ERR(priv->ctrl_regs)) {
1285                 netdev_err(ndev, "failed to map ctrl regs\n");
1286                 return PTR_ERR(priv->ctrl_regs);
1287         }
1288         return 0;
1289 }
1290
1291 static int nixge_probe(struct platform_device *pdev)
1292 {
1293         struct device_node *mn, *phy_node;
1294         struct nixge_priv *priv;
1295         struct net_device *ndev;
1296         const u8 *mac_addr;
1297         int err;
1298
1299         ndev = alloc_etherdev(sizeof(*priv));
1300         if (!ndev)
1301                 return -ENOMEM;
1302
1303         platform_set_drvdata(pdev, ndev);
1304         SET_NETDEV_DEV(ndev, &pdev->dev);
1305
1306         ndev->features = NETIF_F_SG;
1307         ndev->netdev_ops = &nixge_netdev_ops;
1308         ndev->ethtool_ops = &nixge_ethtool_ops;
1309
1310         /* MTU range: 64 - 9000 */
1311         ndev->min_mtu = 64;
1312         ndev->max_mtu = NIXGE_JUMBO_MTU;
1313
1314         mac_addr = nixge_get_nvmem_address(&pdev->dev);
1315         if (!IS_ERR(mac_addr) && is_valid_ether_addr(mac_addr)) {
1316                 eth_hw_addr_set(ndev, mac_addr);
1317                 kfree(mac_addr);
1318         } else {
1319                 eth_hw_addr_random(ndev);
1320         }
1321
1322         priv = netdev_priv(ndev);
1323         priv->ndev = ndev;
1324         priv->dev = &pdev->dev;
1325
1326         netif_napi_add(ndev, &priv->napi, nixge_poll);
1327         err = nixge_of_get_resources(pdev);
1328         if (err)
1329                 goto free_netdev;
1330         __nixge_hw_set_mac_address(ndev);
1331
1332         priv->tx_irq = platform_get_irq_byname(pdev, "tx");
1333         if (priv->tx_irq < 0) {
1334                 netdev_err(ndev, "could not find 'tx' irq");
1335                 err = priv->tx_irq;
1336                 goto free_netdev;
1337         }
1338
1339         priv->rx_irq = platform_get_irq_byname(pdev, "rx");
1340         if (priv->rx_irq < 0) {
1341                 netdev_err(ndev, "could not find 'rx' irq");
1342                 err = priv->rx_irq;
1343                 goto free_netdev;
1344         }
1345
1346         priv->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD;
1347         priv->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD;
1348
1349         mn = of_get_child_by_name(pdev->dev.of_node, "mdio");
1350         if (mn) {
1351                 err = nixge_mdio_setup(priv, mn);
1352                 of_node_put(mn);
1353                 if (err) {
1354                         netdev_err(ndev, "error registering mdio bus");
1355                         goto free_netdev;
1356                 }
1357         }
1358
1359         err = of_get_phy_mode(pdev->dev.of_node, &priv->phy_mode);
1360         if (err) {
1361                 netdev_err(ndev, "not find \"phy-mode\" property\n");
1362                 goto unregister_mdio;
1363         }
1364
1365         phy_node = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
1366         if (!phy_node && of_phy_is_fixed_link(pdev->dev.of_node)) {
1367                 err = of_phy_register_fixed_link(pdev->dev.of_node);
1368                 if (err < 0) {
1369                         netdev_err(ndev, "broken fixed-link specification\n");
1370                         goto unregister_mdio;
1371                 }
1372                 phy_node = of_node_get(pdev->dev.of_node);
1373         }
1374         priv->phy_node = phy_node;
1375
1376         err = register_netdev(priv->ndev);
1377         if (err) {
1378                 netdev_err(ndev, "register_netdev() error (%i)\n", err);
1379                 goto free_phy;
1380         }
1381
1382         return 0;
1383
1384 free_phy:
1385         if (of_phy_is_fixed_link(pdev->dev.of_node))
1386                 of_phy_deregister_fixed_link(pdev->dev.of_node);
1387         of_node_put(phy_node);
1388
1389 unregister_mdio:
1390         if (priv->mii_bus)
1391                 mdiobus_unregister(priv->mii_bus);
1392
1393 free_netdev:
1394         free_netdev(ndev);
1395
1396         return err;
1397 }
1398
1399 static void nixge_remove(struct platform_device *pdev)
1400 {
1401         struct net_device *ndev = platform_get_drvdata(pdev);
1402         struct nixge_priv *priv = netdev_priv(ndev);
1403
1404         unregister_netdev(ndev);
1405
1406         if (of_phy_is_fixed_link(pdev->dev.of_node))
1407                 of_phy_deregister_fixed_link(pdev->dev.of_node);
1408         of_node_put(priv->phy_node);
1409
1410         if (priv->mii_bus)
1411                 mdiobus_unregister(priv->mii_bus);
1412
1413         free_netdev(ndev);
1414 }
1415
1416 static struct platform_driver nixge_driver = {
1417         .probe          = nixge_probe,
1418         .remove_new     = nixge_remove,
1419         .driver         = {
1420                 .name           = "nixge",
1421                 .of_match_table = nixge_dt_ids,
1422         },
1423 };
1424 module_platform_driver(nixge_driver);
1425
1426 MODULE_LICENSE("GPL v2");
1427 MODULE_DESCRIPTION("National Instruments XGE Management MAC");
1428 MODULE_AUTHOR("Moritz Fischer <mdf@kernel.org>");