target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c

   1 /*
   2  * Moschip MCS8140 Ethernet MAC driver
   3  *
   4  * Copyright (C) 2003, Moschip Semiconductors
   5  * Copyright (C) 2012, Florian Fainelli <florian@openwrt.org>
   6  *
   7  * Licensed under GPLv2
   8  */
   9 #include <linux/module.h>
  10 #include <linux/slab.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/delay.h>
  16 #include <linux/ethtool.h>
  17 #include <linux/mii.h>
  18 #include <linux/io.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/of.h>
  22 #include <linux/irq.h>
  23 #include <linux/err.h>
  24 #include <linux/phy.h>
  25 #include <linux/clk.h>
  26 #include <linux/dma-mapping.h>
  27
  28 #include <asm/unaligned.h>
  29 #include <asm/sizes.h>
  30
  31 /* Hardware registers */
  32 #define MAC_BASE_ADDR           ((priv->mac_base))
  33
  34 #define CTRL_REG                (MAC_BASE_ADDR)
  35 #define MII_BUSY                0x00000001
  36 #define MII_WRITE               0x00000002
  37 #define MAC_ADDR_HIGH_REG       (MAC_BASE_ADDR + 0x04)
  38 #define MAC_ADDR_LOW_REG        (MAC_BASE_ADDR + 0x08)
  39 #define MII_ADDR_REG            (MAC_BASE_ADDR + 0x14)
  40 #define MII_DATA_REG            (MAC_BASE_ADDR + 0x18)
  41 /* Link interrupt registers */
  42 #define LINK_INT_CSR            (MAC_BASE_ADDR + 0xD0)
  43 #define LINK_INT_POLL_TIME      (MAC_BASE_ADDR + 0xD4)
  44
  45 #define DMA_CHAN_WIDTH          32
  46 #define DMA_RX_CHAN             0
  47 #define DMA_TX_CHAN             2
  48
  49 /* Receive DMA registers */
  50 #define RX_DMA_BASE             ((priv->dma_base) + \
  51                                 (DMA_CHAN_WIDTH * DMA_RX_CHAN))
  52 #define RX_BUFFER_ADDR          (RX_DMA_BASE + 0x00)
  53 #define RX_MAX_BYTES            (RX_DMA_BASE + 0x04)
  54 #define RX_ACT_BYTES            (RX_DMA_BASE + 0x08)
  55 #define RX_START_DMA            (RX_DMA_BASE + 0x0C)
  56 #define RX_DMA_ENH              (RX_DMA_BASE + 0x14)
  57
  58 /* Transmit DMA registers */
  59 #define TX_DMA_BASE             ((priv->dma_base) + \
  60                                 (DMA_CHAN_WIDTH * DMA_TX_CHAN))
  61 #define TX_BUFFER_ADDR          (TX_DMA_BASE + 0x00)
  62 #define TX_PKT_BYTES            (TX_DMA_BASE + 0x04)
  63 #define TX_BYTES_SENT           (TX_DMA_BASE + 0x08)
  64 #define TX_START_DMA            (TX_DMA_BASE + 0x0C)
  65 #define TX_DMA_STATUS           (TX_DMA_BASE + 0x10)
  66 #define TX_DMA_ENH              (TX_DMA_BASE + 0x14)
  67
  68 #define RX_ALLOC_SIZE           SZ_2K
  69 #define MAX_ETH_FRAME_SIZE      1536
  70 #define RX_SKB_TAILROOM         128
  71 #define RX_SKB_HEADROOM         (RX_ALLOC_SIZE  - \
  72                                 (MAX_ETH_FRAME_SIZE + RX_SKB_TAILROOM) + 0)
  73
  74                         /* WDT     Late COL    Lenght     COL      Type */
  75 #define ERROR_FILTER_MASK ((1<<14) | (1<<15) | (1<<16) | (1<<17) | (0<<18) | \
  76                         /* MII    Dribbling    CRC    Len/type   Control */\
  77                         (1<<19) | (1<<20) | (1<<21) | (0<<24) | (1<<25) | \
  78                         /* Unsup   Missed */\
  79                         (1<<26) | (0<<31))
  80 #define  TX_RING_SIZE  30
  81 #define  RX_RING_SIZE  30
  82
  83 static inline u32 nuport_mac_readl(void __iomem *reg)
  84 {
  85         return __raw_readl(reg);
  86 }
  87
  88 static inline u8 nuport_mac_readb(void __iomem *reg)
  89 {
  90         return __raw_readb(reg);
  91 }
  92
  93 static inline void nuport_mac_writel(u32 value, void __iomem *reg)
  94 {
  95         __raw_writel(value, reg);
  96 }
  97
  98 static inline void nuport_mac_writeb(u8 value, void __iomem *reg)
  99 {
 100         __raw_writel(value, reg);
 101 }
 102
 103 /* MAC private data */
 104 struct nuport_mac_priv {
 105         spinlock_t lock;
 106
 107         void __iomem    *mac_base;
 108         void __iomem    *dma_base;
 109
 110         int             rx_irq;
 111         int             tx_irq;
 112         int             link_irq;
 113         struct clk      *emac_clk;
 114         struct clk      *ephy_clk;
 115
 116         /* Transmit buffers */
 117         struct sk_buff *tx_skb[TX_RING_SIZE];
 118         unsigned int valid_txskb[TX_RING_SIZE];
 119         unsigned int cur_tx;
 120         unsigned int dma_tx;
 121         unsigned int tx_full;
 122
 123         /* Receive buffers */
 124         struct sk_buff *rx_skb[RX_RING_SIZE];
 125         unsigned int irq_rxskb[RX_RING_SIZE];
 126         int pkt_len[RX_RING_SIZE];
 127         unsigned int cur_rx;
 128         unsigned int dma_rx;
 129         unsigned int rx_full;
 130
 131         unsigned int first_pkt;
 132
 133         /* Private data */
 134         struct napi_struct napi;
 135         struct net_device       *dev;
 136         struct platform_device  *pdev;
 137         struct mii_bus          *mii_bus;
 138         struct phy_device       *phydev;
 139         int                     old_link;
 140         int                     old_duplex;
 141         u32                     msg_level;
 142         unsigned int            buffer_shifting_len;
 143 };
 144
 145 static inline int nuport_mac_mii_busy_wait(struct nuport_mac_priv *priv)
 146 {
 147         unsigned long curr;
 148         unsigned long finish = jiffies + 3 * HZ;
 149
 150         do {
 151                 curr = jiffies;
 152                 if (!(nuport_mac_readl(MII_ADDR_REG) & MII_BUSY))
 153                         return 0;
 154                 cpu_relax();
 155         } while (!time_after_eq(curr, finish));
 156
 157         return -EBUSY;
 158 }
 159
 160 /* Read from PHY registers */
 161 static int nuport_mac_mii_read(struct mii_bus *bus,
 162                                 int mii_id, int regnum)
 163 {
 164         struct net_device *dev = bus->priv;
 165         struct nuport_mac_priv *priv = netdev_priv(dev);
 166         int ret;
 167         u32 val = 0;
 168
 169         ret = nuport_mac_mii_busy_wait(priv);
 170         if (ret)
 171                 return ret;
 172
 173         val |= (mii_id << 11) | (regnum << 6) | MII_BUSY;
 174         nuport_mac_writel(val, MII_ADDR_REG);
 175         ret = nuport_mac_mii_busy_wait(priv);
 176         if (ret)
 177                 return ret;
 178
 179         return nuport_mac_readl(MII_DATA_REG);
 180 }
 181
 182 static int nuport_mac_mii_write(struct mii_bus *bus, int mii_id,
 183                                 int regnum, u16 value)
 184 {
 185         struct net_device *dev = bus->priv;
 186         struct nuport_mac_priv *priv = netdev_priv(dev);
 187         int ret;
 188         u32 val = 0;
 189
 190         ret = nuport_mac_mii_busy_wait(priv);
 191         if (ret)
 192                 return ret;
 193
 194         val |= (mii_id << 11) | (regnum << 6) | MII_BUSY | MII_WRITE;
 195         nuport_mac_writel(value, MII_DATA_REG);
 196         nuport_mac_writel(val, MII_ADDR_REG);
 197
 198         return nuport_mac_mii_busy_wait(priv);
 199 }
 200
 201 static int nuport_mac_mii_reset(struct mii_bus *bus)
 202 {
 203         return 0;
 204 }
 205
 206 static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv,
 207                                         struct sk_buff *skb)
 208 {
 209         dma_addr_t p;
 210         u32 reg;
 211         unsigned int timeout = 2048;
 212
 213         while (timeout--) {
 214                 reg = nuport_mac_readl(TX_START_DMA);
 215                 if (!(reg & 0x01)) {
 216                         netdev_dbg(priv->dev, "dma ready\n");
 217                         break;
 218                 }
 219                 cpu_relax();
 220         }
 221
 222         if (!timeout)
 223                 return -EBUSY;
 224
 225         p = dma_map_single(&priv->pdev->dev, skb->data,
 226                         skb->len, DMA_TO_DEVICE);
 227
 228         /* enable enhanced mode */
 229         nuport_mac_writel(0x01, TX_DMA_ENH);
 230         nuport_mac_writel(p, TX_BUFFER_ADDR);
 231         nuport_mac_writel((skb->len) - 1, TX_PKT_BYTES);
 232         wmb();
 233         nuport_mac_writel(0x0D, TX_START_DMA);
 234
 235         return 0;
 236 }
 237
 238 static void nuport_mac_reset_tx_dma(struct nuport_mac_priv *priv)
 239 {
 240         u32 reg;
 241
 242         reg = nuport_mac_readl(TX_START_DMA);
 243         reg |= (1 << 24);
 244         nuport_mac_writel(reg, TX_START_DMA);
 245 }
 246
 247 static int nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,
 248                                         struct sk_buff *skb)
 249 {
 250         dma_addr_t p;
 251         u32 reg;
 252         unsigned int timeout = 2048;
 253
 254         while (timeout--) {
 255                 reg = nuport_mac_readl(RX_START_DMA);
 256                 if (!(reg & 0x01)) {
 257                         netdev_dbg(priv->dev, "dma ready\n");
 258                         break;
 259                 }
 260                 cpu_relax();
 261         }
 262
 263         if (!timeout)
 264                 return -EBUSY;
 265
 266         p = dma_map_single(&priv->pdev->dev, skb->data,
 267                                 RX_ALLOC_SIZE, DMA_FROM_DEVICE);
 268
 269         nuport_mac_writel(p, RX_BUFFER_ADDR);
 270         wmb();
 271         nuport_mac_writel(0x01, RX_START_DMA);
 272
 273         return 0;
 274 }
 275
 276 static void nuport_mac_reset_rx_dma(struct nuport_mac_priv *priv)
 277 {
 278         u32 reg;
 279
 280         reg = nuport_mac_readl(RX_START_DMA);
 281         reg |= (1 << 1);
 282         nuport_mac_writel(reg, RX_START_DMA);
 283 }
 284
 285 /* I suppose this might do something, but I am not sure actually */
 286 static void nuport_mac_disable_rx_dma(struct nuport_mac_priv *priv)
 287 {
 288         u32 reg;
 289
 290         reg = nuport_mac_readl(RX_DMA_ENH);
 291         reg &= ~(1 << 1);
 292         nuport_mac_writel(reg, RX_DMA_ENH);
 293 }
 294
 295 static void nuport_mac_enable_rx_dma(struct nuport_mac_priv *priv)
 296 {
 297         u32 reg;
 298
 299         reg = nuport_mac_readl(RX_DMA_ENH);
 300         reg |= (1 << 1);
 301         nuport_mac_writel(reg, RX_DMA_ENH);
 302 }
 303
 304 /* Add packets to the transmit queue */
 305 static int nuport_mac_start_xmit(struct sk_buff *skb, struct net_device *dev)
 306 {
 307         unsigned long flags;
 308         struct nuport_mac_priv *priv = netdev_priv(dev);
 309         int ret;
 310
 311         if (netif_queue_stopped(dev)) {
 312                 netdev_warn(dev, "netif queue was stopped, restarting\n");
 313                 netif_start_queue(dev);
 314         }
 315
 316         spin_lock_irqsave(&priv->lock, flags);
 317         if (priv->first_pkt) {
 318                 ret = nuport_mac_start_tx_dma(priv, skb);
 319                 if (ret) {
 320                         netif_stop_queue(dev);
 321                         spin_unlock_irqrestore(&priv->lock, flags);
 322                         netdev_err(dev, "transmit path busy\n");
 323                         return NETDEV_TX_BUSY;
 324                 }
 325                 priv->first_pkt = 0;
 326         }
 327
 328         priv->tx_skb[priv->cur_tx] = skb;
 329         dev->stats.tx_bytes += skb->len;
 330         dev->stats.tx_packets++;
 331         priv->valid_txskb[priv->cur_tx] = 1;
 332         priv->cur_tx++;
 333         dev->trans_start = jiffies;
 334
 335         if (priv->cur_tx >= TX_RING_SIZE)
 336                 priv->cur_tx = 0;
 337
 338         spin_unlock_irqrestore(&priv->lock, flags);
 339
 340         if (priv->valid_txskb[priv->cur_tx]) {
 341                 priv->tx_full = 1;
 342                 netdev_err(dev, "stopping queue\n");
 343                 netif_stop_queue(dev);
 344         }
 345
 346         return NETDEV_TX_OK;
 347 }
 348
 349 static void nuport_mac_adjust_link(struct net_device *dev)
 350 {
 351         struct nuport_mac_priv *priv = netdev_priv(dev);
 352         struct phy_device *phydev = priv->phydev;
 353         unsigned int status_changed = 0;
 354         u32 reg;
 355
 356         BUG_ON(!phydev);
 357
 358         if (priv->old_link != phydev->link) {
 359                 status_changed = 1;
 360                 priv->old_link = phydev->link;
 361         }
 362
 363         if (phydev->link & (priv->old_duplex != phydev->duplex)) {
 364                 reg = nuport_mac_readl(CTRL_REG);
 365                 if (phydev->duplex == DUPLEX_FULL)
 366                         reg |= (1 << 20);
 367                 else
 368                         reg &= ~(1 << 20);
 369                 nuport_mac_writel(reg, CTRL_REG);
 370
 371                 status_changed = 1;
 372                 priv->old_duplex = phydev->duplex;
 373         }
 374
 375         if (!status_changed)
 376                 return;
 377
 378         pr_info("%s: link %s", dev->name, phydev->link ?
 379                 "UP" : "DOWN");
 380         if (phydev->link) {
 381                 pr_cont(" - %d/%s", phydev->speed,
 382                 phydev->duplex == DUPLEX_FULL ? "full" : "half");
 383         }
 384         pr_cont("\n");
 385 }
 386
 387 static irqreturn_t nuport_mac_link_interrupt(int irq, void *dev_id)
 388 {
 389         struct net_device *dev = dev_id;
 390         struct nuport_mac_priv *priv = netdev_priv(dev);
 391         u32 reg;
 392         u8 phy_addr;
 393
 394         reg = nuport_mac_readl(LINK_INT_CSR);
 395         phy_addr = (reg >> 1) & 0x0f;
 396
 397         if (phy_addr != priv->phydev->addr) {
 398                 netdev_err(dev, "spurious PHY irq (phy: %d)\n", phy_addr);
 399                 return IRQ_NONE;
 400         }
 401
 402         priv->phydev->link = (reg & (1 << 16));
 403         nuport_mac_adjust_link(dev);
 404
 405         return IRQ_HANDLED;
 406 }
 407
 408 static irqreturn_t nuport_mac_tx_interrupt(int irq, void *dev_id)
 409 {
 410         struct net_device *dev = (struct net_device *)dev_id;
 411         struct nuport_mac_priv *priv = netdev_priv(dev);
 412         struct sk_buff *skb;
 413         unsigned long flags;
 414         int ret;
 415         u32 reg;
 416
 417         spin_lock_irqsave(&priv->lock, flags);
 418         /* clear status word available if ready */
 419         reg = nuport_mac_readl(TX_START_DMA);
 420         if (reg & (1 << 18)) {
 421                 nuport_mac_writel(reg, TX_START_DMA);
 422                 reg = nuport_mac_readl(TX_DMA_STATUS);
 423
 424                 if (reg & 1)
 425                         dev->stats.tx_errors++;
 426         } else
 427                 netdev_dbg(dev, "no status word: %08x\n", reg);
 428
 429         skb = priv->tx_skb[priv->dma_tx];
 430         priv->tx_skb[priv->dma_tx] = NULL;
 431         priv->valid_txskb[priv->dma_tx] = 0;
 432         dev_kfree_skb_irq(skb);
 433
 434         priv->dma_tx++;
 435         if (priv->dma_tx >= TX_RING_SIZE)
 436                 priv->dma_tx = 0;
 437
 438         if (!priv->valid_txskb[priv->dma_tx])
 439                 priv->first_pkt = 1;
 440         else {
 441                 ret = nuport_mac_start_tx_dma(priv, priv->tx_skb[priv->dma_tx]);
 442                 if (ret)
 443                         netdev_err(dev, "failed to restart TX dma\n");
 444         }
 445
 446         if (priv->tx_full) {
 447                 netdev_dbg(dev, "restarting transmit queue\n");
 448                 netif_wake_queue(dev);
 449                 priv->tx_full = 0;
 450         }
 451
 452         spin_unlock_irqrestore(&priv->lock, flags);
 453
 454         return IRQ_HANDLED;
 455 }
 456
 457 static unsigned int nuport_mac_has_work(struct nuport_mac_priv *priv)
 458 {
 459         unsigned int i;
 460
 461         for (i = 0; i < RX_RING_SIZE; i++)
 462                 if (priv->rx_skb[i])
 463                         return 1;
 464
 465         return 0;
 466 }
 467
 468 static irqreturn_t nuport_mac_rx_interrupt(int irq, void *dev_id)
 469 {
 470         struct net_device *dev = (struct net_device *)dev_id;
 471         struct nuport_mac_priv *priv = netdev_priv(dev);
 472         unsigned long flags;
 473         int ret;
 474
 475         spin_lock_irqsave(&priv->lock, flags);
 476         if (!priv->rx_full) {
 477                 priv->pkt_len[priv->dma_rx] = nuport_mac_readl(RX_ACT_BYTES) - 4;
 478                 priv->irq_rxskb[priv->dma_rx] = 0;
 479                 priv->dma_rx++;
 480
 481                 if (priv->dma_rx >= RX_RING_SIZE)
 482                         priv->dma_rx = 0;
 483         } else
 484                 priv->rx_full = 0;
 485
 486         if (priv->irq_rxskb[priv->dma_rx] == 1) {
 487                 ret = nuport_mac_start_rx_dma(priv, priv->rx_skb[priv->dma_rx]);
 488                 if (ret)
 489                         netdev_err(dev, "failed to start rx dma\n");
 490         } else {
 491                 priv->rx_full = 1;
 492                 netdev_dbg(dev, "RX ring full\n");
 493         }
 494
 495         if (likely(nuport_mac_has_work(priv))) {
 496                 /* find a way to disable DMA rx irq */
 497                 nuport_mac_disable_rx_dma(priv);
 498                 napi_schedule(&priv->napi);
 499         }
 500         spin_unlock_irqrestore(&priv->lock, flags);
 501
 502         return IRQ_HANDLED;
 503 }
 504
 505 /* Process received packets in tasklet */
 506 static int nuport_mac_rx(struct net_device *dev, int limit)
 507 {
 508         struct nuport_mac_priv *priv = netdev_priv(dev);
 509         struct sk_buff *skb;
 510         int len, status;
 511         int count = 0;
 512
 513         while (count < limit && !priv->irq_rxskb[priv->cur_rx]) {
 514                 skb = priv->rx_skb[priv->cur_rx];
 515                 len = priv->pkt_len[priv->cur_rx];
 516
 517                 /* Remove 2 bytes added by RX buffer shifting */
 518                 len = len - priv->buffer_shifting_len;
 519                 skb->data = skb->data + priv->buffer_shifting_len;
 520
 521                 /* Get packet status */
 522                 status = get_unaligned((u32 *) (skb->data + len));
 523                 skb->dev = dev;
 524
 525                 /* packet filter failed */
 526                 if (!(status & (1 << 30))) {
 527                         dev_kfree_skb_irq(skb);
 528                         goto exit;
 529                 }
 530
 531                 /* missed frame */
 532                 if (status & (1 << 31)) {
 533                         dev->stats.rx_missed_errors++;
 534                         dev_kfree_skb_irq(skb);
 535                         goto exit;
 536                 }
 537
 538                 /* Not ethernet type */
 539                 if ((!(status & (1 << 18))) || (status & ERROR_FILTER_MASK))
 540                         dev->stats.rx_errors++;
 541
 542                 if (len > MAX_ETH_FRAME_SIZE) {
 543                         dev_kfree_skb_irq(skb);
 544                         goto exit;
 545                 } else
 546                         skb_put(skb, len);
 547
 548                 skb->protocol = eth_type_trans(skb, dev);
 549                 dev->stats.rx_packets++;
 550
 551                 if (status & (1 << 29))
 552                         skb->pkt_type = PACKET_OTHERHOST;
 553                 if (status & (1 << 27))
 554                         skb->pkt_type = PACKET_MULTICAST;
 555                 if (status & (1 << 28))
 556                         skb->pkt_type = PACKET_BROADCAST;
 557
 558                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 559
 560                 /* Pass the received packet to network layer */
 561                 status = netif_receive_skb(skb);
 562                 if (status != NET_RX_DROP)
 563                         dev->stats.rx_bytes += len - 4; /* Without CRC */
 564                 else
 565                         dev->stats.rx_dropped++;
 566
 567                 dev->last_rx = jiffies;
 568
 569 exit:
 570                 skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
 571                 skb_reserve(skb, RX_SKB_HEADROOM);
 572                 priv->rx_skb[priv->cur_rx] = skb;
 573                 priv->irq_rxskb[priv->cur_rx] = 1;
 574                 priv->cur_rx++;
 575
 576                 if (priv->cur_rx >= RX_RING_SIZE)
 577                         priv->cur_rx = 0;
 578                 count++;
 579         }
 580
 581         return count;
 582 }
 583
 584 static int nuport_mac_poll(struct napi_struct *napi, int budget)
 585 {
 586         struct nuport_mac_priv *priv =
 587                 container_of(napi, struct nuport_mac_priv, napi);
 588         struct net_device *dev = priv->dev;
 589         int work_done;
 590
 591         work_done = nuport_mac_rx(dev, budget);
 592
 593         if (work_done < budget) {
 594                 napi_complete(napi);
 595                 nuport_mac_enable_rx_dma(priv);
 596         }
 597
 598         return work_done;
 599 }
 600
 601 static void nuport_mac_init_tx_ring(struct nuport_mac_priv *priv)
 602 {
 603         int i;
 604
 605         priv->cur_tx = priv->dma_tx = priv->tx_full = 0;
 606         for (i = 0; i < TX_RING_SIZE; i++) {
 607                 priv->tx_skb[i] = NULL;
 608                 priv->valid_txskb[i] = 0;
 609         }
 610         priv->first_pkt = 1;
 611 }
 612
 613 static int nuport_mac_init_rx_ring(struct net_device *dev)
 614 {
 615         struct nuport_mac_priv *priv = netdev_priv(dev);
 616         struct sk_buff *skb;
 617         int i;
 618
 619         priv->cur_rx = priv->dma_rx = priv->rx_full = 0;
 620
 621         for (i = 0; i < RX_RING_SIZE; i++) {
 622                 skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
 623                 if (!skb)
 624                         return -ENOMEM;
 625                 skb_reserve(skb, RX_SKB_HEADROOM);
 626                 priv->rx_skb[i] = skb;
 627                 priv->irq_rxskb[i] = 1;
 628         }
 629
 630         return 0;
 631 }
 632
 633 static void nuport_mac_free_rx_ring(struct nuport_mac_priv *priv)
 634 {
 635         int i;
 636
 637         for (i = 0; i < RX_RING_SIZE; i++) {
 638                 if (!priv->rx_skb[i])
 639                         continue;
 640
 641                 dev_kfree_skb(priv->rx_skb[i]);
 642                 priv->rx_skb[i] = NULL;
 643         }
 644 }
 645
 646 static void nuport_mac_read_mac_address(struct net_device *dev)
 647 {
 648         struct nuport_mac_priv *priv = netdev_priv(dev);
 649         int i;
 650
 651         for (i = 0; i < 4; i++)
 652                 dev->dev_addr[i] = nuport_mac_readb(MAC_ADDR_LOW_REG + i);
 653         dev->dev_addr[4] = nuport_mac_readb(MAC_ADDR_HIGH_REG);
 654         dev->dev_addr[5] = nuport_mac_readb(MAC_ADDR_HIGH_REG + 1);
 655
 656         if (!is_valid_ether_addr(dev->dev_addr)) {
 657                 dev_info(&priv->pdev->dev, "using random address\n");
 658                 random_ether_addr(dev->dev_addr);
 659         }
 660 }
 661
 662 static int nuport_mac_change_mac_address(struct net_device *dev, void *mac_addr)
 663 {
 664         struct sockaddr *addr = mac_addr;
 665         struct nuport_mac_priv *priv = netdev_priv(dev);
 666         unsigned long *temp = (unsigned long *)dev->dev_addr;
 667         u32 high, low;
 668
 669         if (netif_running(dev))
 670                 return -EBUSY;
 671
 672         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 673
 674         spin_lock_irq(&priv->lock);
 675
 676         nuport_mac_writel(*temp, MAC_ADDR_LOW_REG);
 677         temp = (unsigned long *)(dev->dev_addr + 4);
 678         nuport_mac_writel(*temp, MAC_ADDR_HIGH_REG);
 679
 680         low = nuport_mac_readl(MAC_ADDR_LOW_REG);
 681         high = nuport_mac_readl(MAC_ADDR_HIGH_REG);
 682
 683         spin_unlock_irq(&priv->lock);
 684
 685         return 0;
 686 }
 687
 688 static int nuport_mac_open(struct net_device *dev)
 689 {
 690         int ret;
 691         struct nuport_mac_priv *priv = netdev_priv(dev);
 692         unsigned long flags;
 693
 694         ret = clk_enable(priv->emac_clk);
 695         if (ret) {
 696                 netdev_err(dev, "failed to enable EMAC clock\n");
 697                 return ret;
 698         }
 699
 700         /* Set MAC into full duplex mode by default */
 701         nuport_mac_writel(0x1010052C, CTRL_REG);
 702
 703         /* set mac address in hardware in case it was not already */
 704         nuport_mac_change_mac_address(dev, dev->dev_addr);
 705
 706         ret = request_irq(priv->link_irq, &nuport_mac_link_interrupt,
 707                                 0, dev->name, dev);
 708         if (ret) {
 709                 netdev_err(dev, "unable to request link interrupt\n");
 710                 goto out_emac_clk;
 711         }
 712
 713         phy_start(priv->phydev);
 714
 715         /* Enable link interrupt monitoring */
 716         spin_lock_irqsave(&priv->lock, flags);
 717         nuport_mac_writel(0x1041 | (priv->phydev->addr << 1), LINK_INT_CSR);
 718         nuport_mac_writel(0xFFFFF, LINK_INT_POLL_TIME);
 719         spin_unlock_irqrestore(&priv->lock, flags);
 720
 721         ret = request_irq(priv->tx_irq, &nuport_mac_tx_interrupt,
 722                                 0, dev->name, dev);
 723         if (ret) {
 724                 netdev_err(dev, "unable to request rx interrupt\n");
 725                 goto out_link_irq;
 726         }
 727
 728         napi_enable(&priv->napi);
 729
 730         ret = request_irq(priv->rx_irq, &nuport_mac_rx_interrupt,
 731                                 0, dev->name, dev);
 732         if (ret) {
 733                 netdev_err(dev, "unable to request tx interrupt\n");
 734                 goto out_tx_irq;
 735         }
 736
 737         netif_start_queue(dev);
 738
 739         nuport_mac_init_tx_ring(priv);
 740
 741         ret = nuport_mac_init_rx_ring(dev);
 742         if (ret) {
 743                 netdev_err(dev, "rx ring init failed\n");
 744                 goto out_rx_skb;
 745         }
 746
 747         nuport_mac_reset_tx_dma(priv);
 748         nuport_mac_reset_rx_dma(priv);
 749
 750         /* Start RX DMA */
 751         return nuport_mac_start_rx_dma(priv, priv->rx_skb[0]);
 752
 753 out_rx_skb:
 754         nuport_mac_free_rx_ring(priv);
 755         free_irq(priv->rx_irq, dev);
 756 out_tx_irq:
 757         free_irq(priv->tx_irq, dev);
 758 out_link_irq:
 759         free_irq(priv->link_irq, dev);
 760 out_emac_clk:
 761         clk_disable(priv->emac_clk);
 762         return ret;
 763 }
 764
 765 static int nuport_mac_close(struct net_device *dev)
 766 {
 767         struct nuport_mac_priv *priv = netdev_priv(dev);
 768
 769         spin_lock_irq(&priv->lock);
 770         napi_disable(&priv->napi);
 771         netif_stop_queue(dev);
 772
 773         free_irq(priv->link_irq, dev);
 774         nuport_mac_writel(0x00, LINK_INT_CSR);
 775         nuport_mac_writel(0x00, LINK_INT_POLL_TIME);
 776         phy_stop(priv->phydev);
 777
 778         free_irq(priv->tx_irq, dev);
 779         free_irq(priv->rx_irq, dev);
 780         spin_unlock_irq(&priv->lock);
 781
 782         nuport_mac_free_rx_ring(priv);
 783
 784         clk_disable(priv->emac_clk);
 785
 786         return 0;
 787 }
 788
 789 static void nuport_mac_tx_timeout(struct net_device *dev)
 790 {
 791         struct nuport_mac_priv *priv = netdev_priv(dev);
 792         unsigned int i;
 793
 794         netdev_warn(dev, "transmit timeout, attempting recovery\n");
 795
 796         netdev_info(dev, "TX DMA regs\n");
 797         for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
 798                 netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(TX_DMA_BASE + i));
 799         netdev_info(dev, "RX DMA regs\n");
 800         for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
 801                 netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(RX_DMA_BASE + i));
 802
 803         nuport_mac_init_tx_ring(priv);
 804         nuport_mac_reset_tx_dma(priv);
 805
 806         netif_wake_queue(dev);
 807 }
 808
 809 static int nuport_mac_mii_probe(struct net_device *dev)
 810 {
 811         struct nuport_mac_priv *priv = netdev_priv(dev);
 812         struct phy_device *phydev = NULL;
 813         int ret;
 814
 815         ret = clk_enable(priv->ephy_clk);
 816         if (ret) {
 817                 netdev_err(dev, "unable to enable ePHY clk\n");
 818                 return ret;
 819         }
 820
 821         phydev = phy_find_first(priv->mii_bus);
 822         if (!phydev) {
 823                 netdev_err(dev, "no PHYs found\n");
 824                 ret = -ENODEV;
 825                 goto out;
 826         }
 827
 828         phydev = phy_connect(dev, dev_name(&phydev->dev),
 829                         nuport_mac_adjust_link, 0,
 830                         PHY_INTERFACE_MODE_MII);
 831         if (IS_ERR(phydev)) {
 832                 netdev_err(dev, "could not attach PHY\n");
 833                 ret = PTR_ERR(phydev);
 834                 goto out;
 835         }
 836
 837         phydev->supported &= PHY_BASIC_FEATURES;
 838         phydev->advertising = phydev->supported;
 839         priv->phydev = phydev;
 840         priv->old_link = 0;
 841         priv->old_duplex = -1;
 842
 843         dev_info(&priv->pdev->dev, "attached PHY driver [%s] "
 844                 "(mii_bus:phy_addr=%d)\n",
 845                 phydev->drv->name, phydev->addr);
 846
 847         return 0;
 848
 849 out:
 850         /* disable the Ethernet PHY clock for the moment */
 851         clk_disable(priv->ephy_clk);
 852
 853         return ret;
 854 }
 855
 856 static void nuport_mac_ethtool_drvinfo(struct net_device *dev,
 857                                         struct ethtool_drvinfo *info)
 858 {
 859         strncpy(info->driver, "nuport-mac", sizeof(info->driver));
 860         strncpy(info->version, "0.1", sizeof(info->version));
 861         strncpy(info->fw_version, "N/A", sizeof(info->fw_version));
 862         strncpy(info->bus_info, "internal", sizeof(info->bus_info));
 863         info->n_stats = 0;
 864         info->testinfo_len = 0;
 865         info->regdump_len = 0;
 866         info->eedump_len = 0;
 867 }
 868
 869 static int nuport_mac_ethtool_get_settings(struct net_device *dev,
 870                                         struct ethtool_cmd *cmd)
 871 {
 872         struct nuport_mac_priv *priv = netdev_priv(dev);
 873
 874         if (priv->phydev)
 875                 return phy_ethtool_gset(priv->phydev, cmd);
 876
 877         return -EINVAL;
 878 }
 879
 880 static int nuport_mac_ethtool_set_settings(struct net_device *dev,
 881                                         struct ethtool_cmd *cmd)
 882 {
 883         struct nuport_mac_priv *priv = netdev_priv(dev);
 884
 885         if (priv->phydev)
 886                 return phy_ethtool_sset(priv->phydev, cmd);
 887
 888         return -EINVAL;
 889 }
 890
 891 static void nuport_mac_set_msglevel(struct net_device *dev, u32 msg_level)
 892 {
 893         struct nuport_mac_priv *priv = netdev_priv(dev);
 894
 895         priv->msg_level = msg_level;
 896 }
 897
 898 static u32 nuport_mac_get_msglevel(struct net_device *dev)
 899 {
 900         struct nuport_mac_priv *priv = netdev_priv(dev);
 901
 902         return priv->msg_level;
 903 }
 904
 905 static const struct ethtool_ops nuport_mac_ethtool_ops = {
 906         .get_drvinfo            = nuport_mac_ethtool_drvinfo,
 907         .get_link               = ethtool_op_get_link,
 908         .get_settings           = nuport_mac_ethtool_get_settings,
 909         .set_settings           = nuport_mac_ethtool_set_settings,
 910         .set_msglevel           = nuport_mac_set_msglevel,
 911         .get_msglevel           = nuport_mac_get_msglevel,
 912 };
 913
 914 static const struct net_device_ops nuport_mac_ops = {
 915         .ndo_open               = nuport_mac_open,
 916         .ndo_stop               = nuport_mac_close,
 917         .ndo_start_xmit         = nuport_mac_start_xmit,
 918         .ndo_change_mtu         = eth_change_mtu,
 919         .ndo_validate_addr      = eth_validate_addr,
 920         .ndo_set_mac_address    = nuport_mac_change_mac_address,
 921         .ndo_tx_timeout         = nuport_mac_tx_timeout,
 922 };
 923
 924 static int __init nuport_mac_probe(struct platform_device *pdev)
 925 {
 926         struct net_device *dev;
 927         struct nuport_mac_priv *priv = NULL;
 928         struct resource *regs, *dma;
 929         int ret = 0;
 930         int rx_irq, tx_irq, link_irq;
 931         int i;
 932         const unsigned int *intspec;
 933
 934         dev = alloc_etherdev(sizeof(struct nuport_mac_priv));
 935         if (!dev) {
 936                 dev_err(&pdev->dev, "no memory for net_device\n");
 937                 return -ENOMEM;
 938         }
 939
 940         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 941         dma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 942         if (!regs || !dma) {
 943                 dev_err(&pdev->dev, "failed to get regs resources\n");
 944                 ret = -ENODEV;
 945                 goto out;
 946         }
 947
 948         rx_irq = platform_get_irq(pdev, 0);
 949         tx_irq = platform_get_irq(pdev, 1);
 950         link_irq = platform_get_irq(pdev, 2);
 951         if (rx_irq < 0 || tx_irq < 0 || link_irq < 0) {
 952                 ret = -ENODEV;
 953                 goto out;
 954         }
 955
 956         platform_set_drvdata(pdev, dev);
 957         SET_NETDEV_DEV(dev, &pdev->dev);
 958         priv = netdev_priv(dev);
 959         priv->pdev = pdev;
 960         priv->dev = dev;
 961         spin_lock_init(&priv->lock);
 962
 963         intspec = of_get_property(pdev->dev.of_node,
 964                                 "nuport-mac,buffer-shifting", NULL);
 965         if (!intspec)
 966                 priv->buffer_shifting_len = 0;
 967         else
 968                 priv->buffer_shifting_len = 2;
 969
 970         priv->mac_base = devm_ioremap(&pdev->dev,
 971                                 regs->start, resource_size(regs));
 972         if (!priv->mac_base) {
 973                 dev_err(&pdev->dev, "failed to remap regs\n");
 974                 ret = -ENOMEM;
 975                 goto out_platform;
 976         }
 977
 978         priv->dma_base = devm_ioremap(&pdev->dev,
 979                                 dma->start, resource_size(dma));
 980         if (!priv->dma_base) {
 981                 dev_err(&pdev->dev, "failed to remap dma-regs\n");
 982                 ret = -ENOMEM;
 983                 goto out_platform;
 984         }
 985
 986         priv->emac_clk = clk_get(&pdev->dev, "emac");
 987         if (IS_ERR_OR_NULL(priv->emac_clk)) {
 988                 dev_err(&pdev->dev, "failed to get emac clk\n");
 989                 ret = PTR_ERR(priv->emac_clk);
 990                 goto out_platform;
 991         }
 992
 993         priv->ephy_clk = clk_get(&pdev->dev, "ephy");
 994         if (IS_ERR_OR_NULL(priv->ephy_clk)) {
 995                 dev_err(&pdev->dev, "failed to get ephy clk\n");
 996                 ret = PTR_ERR(priv->ephy_clk);
 997                 goto out_platform;
 998         }
 999
1000         priv->link_irq = link_irq;
1001         priv->rx_irq = rx_irq;
1002         priv->tx_irq = tx_irq;
1003         priv->msg_level = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK;
1004         dev->netdev_ops = &nuport_mac_ops;
1005         dev->ethtool_ops = &nuport_mac_ethtool_ops;
1006         dev->watchdog_timeo = HZ;
1007         dev->flags = IFF_BROADCAST;     /* Supports Broadcast */
1008         dev->tx_queue_len = TX_RING_SIZE / 2;
1009
1010         netif_napi_add(dev, &priv->napi, nuport_mac_poll, 64);
1011
1012         priv->mii_bus = mdiobus_alloc();
1013         if (!priv->mii_bus) {
1014                 dev_err(&pdev->dev, "mii bus allocation failed\n");
1015                 goto out;
1016         }
1017
1018         priv->mii_bus->priv = dev;
1019         priv->mii_bus->read = nuport_mac_mii_read;
1020         priv->mii_bus->write = nuport_mac_mii_write;
1021         priv->mii_bus->reset = nuport_mac_mii_reset;
1022         priv->mii_bus->name = "nuport-mac-mii";
1023         priv->mii_bus->phy_mask = (1 << 0);
1024         snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
1025         priv->mii_bus->irq = kzalloc(PHY_MAX_ADDR * sizeof(int), GFP_KERNEL);
1026         if (!priv->mii_bus->irq) {
1027                 dev_err(&pdev->dev, "failed to allocate mii_bus irqs\n");
1028                 ret = -ENOMEM;
1029                 goto out_mdio;
1030         }
1031
1032         /* We support PHY interrupts routed back to the MAC */
1033         for (i = 0; i < PHY_MAX_ADDR; i++)
1034                 priv->mii_bus->irq[i] = PHY_IGNORE_INTERRUPT;
1035
1036         ret = mdiobus_register(priv->mii_bus);
1037         if (ret) {
1038                 dev_err(&pdev->dev, "failed to register mii_bus\n");
1039                 goto out_mdio_irq;
1040         }
1041
1042         ret = nuport_mac_mii_probe(dev);
1043         if (ret) {
1044                 dev_err(&pdev->dev, "failed to probe MII bus\n");
1045                 goto out_mdio_unregister;
1046         }
1047
1048         ret = register_netdev(dev);
1049         if (ret) {
1050                 dev_err(&pdev->dev, "failed to register net_device\n");
1051                 goto out_mdio_probe;
1052         }
1053
1054         /* read existing mac address */
1055         nuport_mac_read_mac_address(dev);
1056
1057         dev_info(&pdev->dev, "registered (MAC: %pM)\n", dev->dev_addr);
1058
1059         return ret;
1060
1061 out_mdio_probe:
1062         phy_disconnect(priv->phydev);
1063 out_mdio_unregister:
1064         mdiobus_unregister(priv->mii_bus);
1065 out_mdio_irq:
1066         kfree(priv->mii_bus->irq);
1067 out_mdio:
1068         mdiobus_free(priv->mii_bus);
1069 out_platform:
1070         platform_set_drvdata(pdev, NULL);
1071 out:
1072         clk_put(priv->ephy_clk);
1073         clk_put(priv->emac_clk);
1074         free_netdev(dev);
1075         platform_set_drvdata(pdev, NULL);
1076         return ret;
1077 }
1078
1079 static int nuport_mac_remove(struct platform_device *pdev)
1080 {
1081         struct net_device *dev = platform_get_drvdata(pdev);
1082         struct nuport_mac_priv *priv = netdev_priv(dev);
1083
1084         unregister_netdev(dev);
1085         phy_disconnect(priv->phydev);
1086         mdiobus_unregister(priv->mii_bus);
1087         kfree(priv->mii_bus->irq);
1088         mdiobus_free(priv->mii_bus);
1089         clk_put(priv->ephy_clk);
1090         clk_put(priv->emac_clk);
1091         free_netdev(dev);
1092
1093         platform_set_drvdata(pdev, NULL);
1094
1095         return 0;
1096 }
1097
1098 static struct of_device_id nuport_eth_ids[] __initdata = {
1099         {.compatible = "moschip,nuport-mac",},
1100         { /* sentinel */ },
1101 };
1102
1103 static struct platform_driver nuport_eth_driver = {
1104         .driver = {
1105                 .name = "nuport-mac",
1106                 .owner = THIS_MODULE,
1107                 .of_match_table = nuport_eth_ids,
1108         },
1109         .probe  = nuport_mac_probe,
1110         .remove = __devexit_p(nuport_mac_remove),
1111 };
1112
1113 module_platform_driver(nuport_eth_driver);
1114
1115 MODULE_AUTHOR("Moschip Semiconductors Ltd.");
1116 MODULE_DESCRIPTION("Moschip MCS8140 Ethernet MAC driver");
1117 MODULE_LICENSE("GPL");