1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * RDC R6040 Fast Ethernet MAC support 4 * 5 * Copyright (C) 2004 Sten Wang <sten.wang@rdc.com.tw> 6 * Copyright (C) 2007 7 * Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us> 8 * Copyright (C) 2007-2012 Florian Fainelli <f.fainelli@gmail.com> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/moduleparam.h> 14 #include <linux/string.h> 15 #include <linux/timer.h> 16 #include <linux/errno.h> 17 #include <linux/ioport.h> 18 #include <linux/interrupt.h> 19 #include <linux/pci.h> 20 #include <linux/netdevice.h> 21 #include <linux/etherdevice.h> 22 #include <linux/skbuff.h> 23 #include <linux/delay.h> 24 #include <linux/mii.h> 25 #include <linux/ethtool.h> 26 #include <linux/crc32.h> 27 #include <linux/spinlock.h> 28 #include <linux/bitops.h> 29 #include <linux/io.h> 30 #include <linux/irq.h> 31 #include <linux/uaccess.h> 32 #include <linux/phy.h> 33 34 #include <asm/processor.h> 35 36 #define DRV_NAME "r6040" 37 #define DRV_VERSION "0.29" 38 #define DRV_RELDATE "04Jul2016" 39 40 /* Time in jiffies before concluding the transmitter is hung. */ 41 #define TX_TIMEOUT (6000 * HZ / 1000) 42 43 /* RDC MAC I/O Size */ 44 #define R6040_IO_SIZE 256 45 46 /* MAX RDC MAC */ 47 #define MAX_MAC 2 48 49 /* MAC registers */ 50 #define MCR0 0x00 /* Control register 0 */ 51 #define MCR0_RCVEN 0x0002 /* Receive enable */ 52 #define MCR0_PROMISC 0x0020 /* Promiscuous mode */ 53 #define MCR0_HASH_EN 0x0100 /* Enable multicast hash table function */ 54 #define MCR0_XMTEN 0x1000 /* Transmission enable */ 55 #define MCR0_FD 0x8000 /* Full/Half duplex */ 56 #define MCR1 0x04 /* Control register 1 */ 57 #define MAC_RST 0x0001 /* Reset the MAC */ 58 #define MBCR 0x08 /* Bus control */ 59 #define MT_ICR 0x0C /* TX interrupt control */ 60 #define MR_ICR 0x10 /* RX interrupt control */ 61 #define MTPR 0x14 /* TX poll command register */ 62 #define TM2TX 0x0001 /* Trigger MAC to transmit */ 63 #define MR_BSR 0x18 /* RX buffer size */ 64 #define MR_DCR 0x1A /* RX descriptor control */ 65 #define MLSR 0x1C /* Last status */ 66 #define TX_FIFO_UNDR 0x0200 /* TX FIFO under-run */ 67 #define TX_EXCEEDC 0x2000 /* Transmit exceed collision */ 68 #define TX_LATEC 0x4000 /* Transmit late collision */ 69 #define MMDIO 0x20 /* MDIO control register */ 70 #define MDIO_WRITE 0x4000 /* MDIO write */ 71 #define MDIO_READ 0x2000 /* MDIO read */ 72 #define MMRD 0x24 /* MDIO read data register */ 73 #define MMWD 0x28 /* MDIO write data register */ 74 #define MTD_SA0 0x2C /* TX descriptor start address 0 */ 75 #define MTD_SA1 0x30 /* TX descriptor start address 1 */ 76 #define MRD_SA0 0x34 /* RX descriptor start address 0 */ 77 #define MRD_SA1 0x38 /* RX descriptor start address 1 */ 78 #define MISR 0x3C /* Status register */ 79 #define MIER 0x40 /* INT enable register */ 80 #define MSK_INT 0x0000 /* Mask off interrupts */ 81 #define RX_FINISH 0x0001 /* RX finished */ 82 #define RX_NO_DESC 0x0002 /* No RX descriptor available */ 83 #define RX_FIFO_FULL 0x0004 /* RX FIFO full */ 84 #define RX_EARLY 0x0008 /* RX early */ 85 #define TX_FINISH 0x0010 /* TX finished */ 86 #define TX_EARLY 0x0080 /* TX early */ 87 #define EVENT_OVRFL 0x0100 /* Event counter overflow */ 88 #define LINK_CHANGED 0x0200 /* PHY link changed */ 89 #define ME_CISR 0x44 /* Event counter INT status */ 90 #define ME_CIER 0x48 /* Event counter INT enable */ 91 #define MR_CNT 0x50 /* Successfully received packet counter */ 92 #define ME_CNT0 0x52 /* Event counter 0 */ 93 #define ME_CNT1 0x54 /* Event counter 1 */ 94 #define ME_CNT2 0x56 /* Event counter 2 */ 95 #define ME_CNT3 0x58 /* Event counter 3 */ 96 #define MT_CNT 0x5A /* Successfully transmit packet counter */ 97 #define ME_CNT4 0x5C /* Event counter 4 */ 98 #define MP_CNT 0x5E /* Pause frame counter register */ 99 #define MAR0 0x60 /* Hash table 0 */ 100 #define MAR1 0x62 /* Hash table 1 */ 101 #define MAR2 0x64 /* Hash table 2 */ 102 #define MAR3 0x66 /* Hash table 3 */ 103 #define MID_0L 0x68 /* Multicast address MID0 Low */ 104 #define MID_0M 0x6A /* Multicast address MID0 Medium */ 105 #define MID_0H 0x6C /* Multicast address MID0 High */ 106 #define MID_1L 0x70 /* MID1 Low */ 107 #define MID_1M 0x72 /* MID1 Medium */ 108 #define MID_1H 0x74 /* MID1 High */ 109 #define MID_2L 0x78 /* MID2 Low */ 110 #define MID_2M 0x7A /* MID2 Medium */ 111 #define MID_2H 0x7C /* MID2 High */ 112 #define MID_3L 0x80 /* MID3 Low */ 113 #define MID_3M 0x82 /* MID3 Medium */ 114 #define MID_3H 0x84 /* MID3 High */ 115 #define PHY_CC 0x88 /* PHY status change configuration register */ 116 #define SCEN 0x8000 /* PHY status change enable */ 117 #define PHYAD_SHIFT 8 /* PHY address shift */ 118 #define TMRDIV_SHIFT 0 /* Timer divider shift */ 119 #define PHY_ST 0x8A /* PHY status register */ 120 #define MAC_SM 0xAC /* MAC status machine */ 121 #define MAC_SM_RST 0x0002 /* MAC status machine reset */ 122 #define MD_CSC 0xb6 /* MDC speed control register */ 123 #define MD_CSC_DEFAULT 0x0030 124 #define MAC_ID 0xBE /* Identifier register */ 125 126 #define TX_DCNT 0x80 /* TX descriptor count */ 127 #define RX_DCNT 0x80 /* RX descriptor count */ 128 #define MAX_BUF_SIZE 0x600 129 #define RX_DESC_SIZE (RX_DCNT * sizeof(struct r6040_descriptor)) 130 #define TX_DESC_SIZE (TX_DCNT * sizeof(struct r6040_descriptor)) 131 #define MBCR_DEFAULT 0x012A /* MAC Bus Control Register */ 132 #define MCAST_MAX 3 /* Max number multicast addresses to filter */ 133 134 #define MAC_DEF_TIMEOUT 2048 /* Default MAC read/write operation timeout */ 135 136 /* Descriptor status */ 137 #define DSC_OWNER_MAC 0x8000 /* MAC is the owner of this descriptor */ 138 #define DSC_RX_OK 0x4000 /* RX was successful */ 139 #define DSC_RX_ERR 0x0800 /* RX PHY error */ 140 #define DSC_RX_ERR_DRI 0x0400 /* RX dribble packet */ 141 #define DSC_RX_ERR_BUF 0x0200 /* RX length exceeds buffer size */ 142 #define DSC_RX_ERR_LONG 0x0100 /* RX length > maximum packet length */ 143 #define DSC_RX_ERR_RUNT 0x0080 /* RX packet length < 64 byte */ 144 #define DSC_RX_ERR_CRC 0x0040 /* RX CRC error */ 145 #define DSC_RX_BCAST 0x0020 /* RX broadcast (no error) */ 146 #define DSC_RX_MCAST 0x0010 /* RX multicast (no error) */ 147 #define DSC_RX_MCH_HIT 0x0008 /* RX multicast hit in hash table (no error) */ 148 #define DSC_RX_MIDH_HIT 0x0004 /* RX MID table hit (no error) */ 149 #define DSC_RX_IDX_MID_MASK 3 /* RX mask for the index of matched MIDx */ 150 151 MODULE_AUTHOR("Sten Wang <sten.wang@rdc.com.tw>," 152 "Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>," 153 "Florian Fainelli <f.fainelli@gmail.com>"); 154 MODULE_LICENSE("GPL"); 155 MODULE_DESCRIPTION("RDC R6040 NAPI PCI FastEthernet driver"); 156 MODULE_VERSION(DRV_VERSION " " DRV_RELDATE); 157 158 /* RX and TX interrupts that we handle */ 159 #define RX_INTS (RX_FIFO_FULL | RX_NO_DESC | RX_FINISH) 160 #define TX_INTS (TX_FINISH) 161 #define INT_MASK (RX_INTS | TX_INTS) 162 163 struct r6040_descriptor { 164 u16 status, len; /* 0-3 */ 165 __le32 buf; /* 4-7 */ 166 __le32 ndesc; /* 8-B */ 167 u32 rev1; /* C-F */ 168 char *vbufp; /* 10-13 */ 169 struct r6040_descriptor *vndescp; /* 14-17 */ 170 struct sk_buff *skb_ptr; /* 18-1B */ 171 u32 rev2; /* 1C-1F */ 172 } __aligned(32); 173 174 struct r6040_private { 175 spinlock_t lock; /* driver lock */ 176 struct pci_dev *pdev; 177 struct r6040_descriptor *rx_insert_ptr; 178 struct r6040_descriptor *rx_remove_ptr; 179 struct r6040_descriptor *tx_insert_ptr; 180 struct r6040_descriptor *tx_remove_ptr; 181 struct r6040_descriptor *rx_ring; 182 struct r6040_descriptor *tx_ring; 183 dma_addr_t rx_ring_dma; 184 dma_addr_t tx_ring_dma; 185 u16 tx_free_desc; 186 u16 mcr0; 187 struct net_device *dev; 188 struct mii_bus *mii_bus; 189 struct napi_struct napi; 190 void __iomem *base; 191 int old_link; 192 int old_duplex; 193 }; 194 195 static char version[] = DRV_NAME 196 ": RDC R6040 NAPI net driver," 197 "version "DRV_VERSION " (" DRV_RELDATE ")"; 198 199 /* Read a word data from PHY Chip */ 200 static int r6040_phy_read(void __iomem *ioaddr, int phy_addr, int reg) 201 { 202 int limit = MAC_DEF_TIMEOUT; 203 u16 cmd; 204 205 iowrite16(MDIO_READ | reg | (phy_addr << 8), ioaddr + MMDIO); 206 /* Wait for the read bit to be cleared */ 207 while (limit--) { 208 cmd = ioread16(ioaddr + MMDIO); 209 if (!(cmd & MDIO_READ)) 210 break; 211 udelay(1); 212 } 213 214 if (limit < 0) 215 return -ETIMEDOUT; 216 217 return ioread16(ioaddr + MMRD); 218 } 219 220 /* Write a word data from PHY Chip */ 221 static int r6040_phy_write(void __iomem *ioaddr, 222 int phy_addr, int reg, u16 val) 223 { 224 int limit = MAC_DEF_TIMEOUT; 225 u16 cmd; 226 227 iowrite16(val, ioaddr + MMWD); 228 /* Write the command to the MDIO bus */ 229 iowrite16(MDIO_WRITE | reg | (phy_addr << 8), ioaddr + MMDIO); 230 /* Wait for the write bit to be cleared */ 231 while (limit--) { 232 cmd = ioread16(ioaddr + MMDIO); 233 if (!(cmd & MDIO_WRITE)) 234 break; 235 udelay(1); 236 } 237 238 return (limit < 0) ? -ETIMEDOUT : 0; 239 } 240 241 static int r6040_mdiobus_read(struct mii_bus *bus, int phy_addr, int reg) 242 { 243 struct net_device *dev = bus->priv; 244 struct r6040_private *lp = netdev_priv(dev); 245 void __iomem *ioaddr = lp->base; 246 247 return r6040_phy_read(ioaddr, phy_addr, reg); 248 } 249 250 static int r6040_mdiobus_write(struct mii_bus *bus, int phy_addr, 251 int reg, u16 value) 252 { 253 struct net_device *dev = bus->priv; 254 struct r6040_private *lp = netdev_priv(dev); 255 void __iomem *ioaddr = lp->base; 256 257 return r6040_phy_write(ioaddr, phy_addr, reg, value); 258 } 259 260 static void r6040_free_txbufs(struct net_device *dev) 261 { 262 struct r6040_private *lp = netdev_priv(dev); 263 int i; 264 265 for (i = 0; i < TX_DCNT; i++) { 266 if (lp->tx_insert_ptr->skb_ptr) { 267 dma_unmap_single(&lp->pdev->dev, 268 le32_to_cpu(lp->tx_insert_ptr->buf), 269 MAX_BUF_SIZE, DMA_TO_DEVICE); 270 dev_kfree_skb(lp->tx_insert_ptr->skb_ptr); 271 lp->tx_insert_ptr->skb_ptr = NULL; 272 } 273 lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp; 274 } 275 } 276 277 static void r6040_free_rxbufs(struct net_device *dev) 278 { 279 struct r6040_private *lp = netdev_priv(dev); 280 int i; 281 282 for (i = 0; i < RX_DCNT; i++) { 283 if (lp->rx_insert_ptr->skb_ptr) { 284 dma_unmap_single(&lp->pdev->dev, 285 le32_to_cpu(lp->rx_insert_ptr->buf), 286 MAX_BUF_SIZE, DMA_FROM_DEVICE); 287 dev_kfree_skb(lp->rx_insert_ptr->skb_ptr); 288 lp->rx_insert_ptr->skb_ptr = NULL; 289 } 290 lp->rx_insert_ptr = lp->rx_insert_ptr->vndescp; 291 } 292 } 293 294 static void r6040_init_ring_desc(struct r6040_descriptor *desc_ring, 295 dma_addr_t desc_dma, int size) 296 { 297 struct r6040_descriptor *desc = desc_ring; 298 dma_addr_t mapping = desc_dma; 299 300 while (size-- > 0) { 301 mapping += sizeof(*desc); 302 desc->ndesc = cpu_to_le32(mapping); 303 desc->vndescp = desc + 1; 304 desc++; 305 } 306 desc--; 307 desc->ndesc = cpu_to_le32(desc_dma); 308 desc->vndescp = desc_ring; 309 } 310 311 static void r6040_init_txbufs(struct net_device *dev) 312 { 313 struct r6040_private *lp = netdev_priv(dev); 314 315 lp->tx_free_desc = TX_DCNT; 316 317 lp->tx_remove_ptr = lp->tx_insert_ptr = lp->tx_ring; 318 r6040_init_ring_desc(lp->tx_ring, lp->tx_ring_dma, TX_DCNT); 319 } 320 321 static int r6040_alloc_rxbufs(struct net_device *dev) 322 { 323 struct r6040_private *lp = netdev_priv(dev); 324 struct r6040_descriptor *desc; 325 struct sk_buff *skb; 326 int rc; 327 328 lp->rx_remove_ptr = lp->rx_insert_ptr = lp->rx_ring; 329 r6040_init_ring_desc(lp->rx_ring, lp->rx_ring_dma, RX_DCNT); 330 331 /* Allocate skbs for the rx descriptors */ 332 desc = lp->rx_ring; 333 do { 334 skb = netdev_alloc_skb(dev, MAX_BUF_SIZE); 335 if (!skb) { 336 rc = -ENOMEM; 337 goto err_exit; 338 } 339 desc->skb_ptr = skb; 340 desc->buf = cpu_to_le32(dma_map_single(&lp->pdev->dev, 341 desc->skb_ptr->data, 342 MAX_BUF_SIZE, 343 DMA_FROM_DEVICE)); 344 desc->status = DSC_OWNER_MAC; 345 desc = desc->vndescp; 346 } while (desc != lp->rx_ring); 347 348 return 0; 349 350 err_exit: 351 /* Deallocate all previously allocated skbs */ 352 r6040_free_rxbufs(dev); 353 return rc; 354 } 355 356 static void r6040_reset_mac(struct r6040_private *lp) 357 { 358 void __iomem *ioaddr = lp->base; 359 int limit = MAC_DEF_TIMEOUT; 360 u16 cmd, md_csc; 361 362 md_csc = ioread16(ioaddr + MD_CSC); 363 iowrite16(MAC_RST, ioaddr + MCR1); 364 while (limit--) { 365 cmd = ioread16(ioaddr + MCR1); 366 if (cmd & MAC_RST) 367 break; 368 } 369 370 /* Reset internal state machine */ 371 iowrite16(MAC_SM_RST, ioaddr + MAC_SM); 372 iowrite16(0, ioaddr + MAC_SM); 373 mdelay(5); 374 375 /* Restore MDIO clock frequency */ 376 if (md_csc != MD_CSC_DEFAULT) 377 iowrite16(md_csc, ioaddr + MD_CSC); 378 } 379 380 static void r6040_init_mac_regs(struct net_device *dev) 381 { 382 struct r6040_private *lp = netdev_priv(dev); 383 void __iomem *ioaddr = lp->base; 384 385 /* Mask Off Interrupt */ 386 iowrite16(MSK_INT, ioaddr + MIER); 387 388 /* Reset RDC MAC */ 389 r6040_reset_mac(lp); 390 391 /* MAC Bus Control Register */ 392 iowrite16(MBCR_DEFAULT, ioaddr + MBCR); 393 394 /* Buffer Size Register */ 395 iowrite16(MAX_BUF_SIZE, ioaddr + MR_BSR); 396 397 /* Write TX ring start address */ 398 iowrite16(lp->tx_ring_dma, ioaddr + MTD_SA0); 399 iowrite16(lp->tx_ring_dma >> 16, ioaddr + MTD_SA1); 400 401 /* Write RX ring start address */ 402 iowrite16(lp->rx_ring_dma, ioaddr + MRD_SA0); 403 iowrite16(lp->rx_ring_dma >> 16, ioaddr + MRD_SA1); 404 405 /* Set interrupt waiting time and packet numbers */ 406 iowrite16(0, ioaddr + MT_ICR); 407 iowrite16(0, ioaddr + MR_ICR); 408 409 /* Enable interrupts */ 410 iowrite16(INT_MASK, ioaddr + MIER); 411 412 /* Enable TX and RX */ 413 iowrite16(lp->mcr0 | MCR0_RCVEN, ioaddr); 414 415 /* Let TX poll the descriptors 416 * we may got called by r6040_tx_timeout which has left 417 * some unsent tx buffers */ 418 iowrite16(TM2TX, ioaddr + MTPR); 419 } 420 421 static void r6040_tx_timeout(struct net_device *dev, unsigned int txqueue) 422 { 423 struct r6040_private *priv = netdev_priv(dev); 424 void __iomem *ioaddr = priv->base; 425 426 netdev_warn(dev, "transmit timed out, int enable %4.4x " 427 "status %4.4x\n", 428 ioread16(ioaddr + MIER), 429 ioread16(ioaddr + MISR)); 430 431 dev->stats.tx_errors++; 432 433 /* Reset MAC and re-init all registers */ 434 r6040_init_mac_regs(dev); 435 } 436 437 static struct net_device_stats *r6040_get_stats(struct net_device *dev) 438 { 439 struct r6040_private *priv = netdev_priv(dev); 440 void __iomem *ioaddr = priv->base; 441 unsigned long flags; 442 443 spin_lock_irqsave(&priv->lock, flags); 444 dev->stats.rx_crc_errors += ioread8(ioaddr + ME_CNT1); 445 dev->stats.multicast += ioread8(ioaddr + ME_CNT0); 446 spin_unlock_irqrestore(&priv->lock, flags); 447 448 return &dev->stats; 449 } 450 451 /* Stop RDC MAC and Free the allocated resource */ 452 static void r6040_down(struct net_device *dev) 453 { 454 struct r6040_private *lp = netdev_priv(dev); 455 void __iomem *ioaddr = lp->base; 456 const u16 *adrp; 457 458 /* Stop MAC */ 459 iowrite16(MSK_INT, ioaddr + MIER); /* Mask Off Interrupt */ 460 461 /* Reset RDC MAC */ 462 r6040_reset_mac(lp); 463 464 /* Restore MAC Address to MIDx */ 465 adrp = (const u16 *) dev->dev_addr; 466 iowrite16(adrp[0], ioaddr + MID_0L); 467 iowrite16(adrp[1], ioaddr + MID_0M); 468 iowrite16(adrp[2], ioaddr + MID_0H); 469 } 470 471 static int r6040_close(struct net_device *dev) 472 { 473 struct r6040_private *lp = netdev_priv(dev); 474 struct pci_dev *pdev = lp->pdev; 475 476 phy_stop(dev->phydev); 477 napi_disable(&lp->napi); 478 netif_stop_queue(dev); 479 480 spin_lock_irq(&lp->lock); 481 r6040_down(dev); 482 483 /* Free RX buffer */ 484 r6040_free_rxbufs(dev); 485 486 /* Free TX buffer */ 487 r6040_free_txbufs(dev); 488 489 spin_unlock_irq(&lp->lock); 490 491 free_irq(dev->irq, dev); 492 493 /* Free Descriptor memory */ 494 if (lp->rx_ring) { 495 dma_free_coherent(&pdev->dev, RX_DESC_SIZE, lp->rx_ring, 496 lp->rx_ring_dma); 497 lp->rx_ring = NULL; 498 } 499 500 if (lp->tx_ring) { 501 dma_free_coherent(&pdev->dev, TX_DESC_SIZE, lp->tx_ring, 502 lp->tx_ring_dma); 503 lp->tx_ring = NULL; 504 } 505 506 return 0; 507 } 508 509 static int r6040_rx(struct net_device *dev, int limit) 510 { 511 struct r6040_private *priv = netdev_priv(dev); 512 struct r6040_descriptor *descptr = priv->rx_remove_ptr; 513 struct sk_buff *skb_ptr, *new_skb; 514 int count = 0; 515 u16 err; 516 517 /* Limit not reached and the descriptor belongs to the CPU */ 518 while (count < limit && !(descptr->status & DSC_OWNER_MAC)) { 519 /* Read the descriptor status */ 520 err = descptr->status; 521 /* Global error status set */ 522 if (err & DSC_RX_ERR) { 523 /* RX dribble */ 524 if (err & DSC_RX_ERR_DRI) 525 dev->stats.rx_frame_errors++; 526 /* Buffer length exceeded */ 527 if (err & DSC_RX_ERR_BUF) 528 dev->stats.rx_length_errors++; 529 /* Packet too long */ 530 if (err & DSC_RX_ERR_LONG) 531 dev->stats.rx_length_errors++; 532 /* Packet < 64 bytes */ 533 if (err & DSC_RX_ERR_RUNT) 534 dev->stats.rx_length_errors++; 535 /* CRC error */ 536 if (err & DSC_RX_ERR_CRC) { 537 spin_lock(&priv->lock); 538 dev->stats.rx_crc_errors++; 539 spin_unlock(&priv->lock); 540 } 541 goto next_descr; 542 } 543 544 /* Packet successfully received */ 545 new_skb = netdev_alloc_skb(dev, MAX_BUF_SIZE); 546 if (!new_skb) { 547 dev->stats.rx_dropped++; 548 goto next_descr; 549 } 550 skb_ptr = descptr->skb_ptr; 551 skb_ptr->dev = priv->dev; 552 553 /* Do not count the CRC */ 554 skb_put(skb_ptr, descptr->len - ETH_FCS_LEN); 555 dma_unmap_single(&priv->pdev->dev, le32_to_cpu(descptr->buf), 556 MAX_BUF_SIZE, DMA_FROM_DEVICE); 557 skb_ptr->protocol = eth_type_trans(skb_ptr, priv->dev); 558 559 /* Send to upper layer */ 560 netif_receive_skb(skb_ptr); 561 dev->stats.rx_packets++; 562 dev->stats.rx_bytes += descptr->len - ETH_FCS_LEN; 563 564 /* put new skb into descriptor */ 565 descptr->skb_ptr = new_skb; 566 descptr->buf = cpu_to_le32(dma_map_single(&priv->pdev->dev, 567 descptr->skb_ptr->data, 568 MAX_BUF_SIZE, 569 DMA_FROM_DEVICE)); 570 571 next_descr: 572 /* put the descriptor back to the MAC */ 573 descptr->status = DSC_OWNER_MAC; 574 descptr = descptr->vndescp; 575 count++; 576 } 577 priv->rx_remove_ptr = descptr; 578 579 return count; 580 } 581 582 static void r6040_tx(struct net_device *dev) 583 { 584 struct r6040_private *priv = netdev_priv(dev); 585 struct r6040_descriptor *descptr; 586 void __iomem *ioaddr = priv->base; 587 struct sk_buff *skb_ptr; 588 u16 err; 589 590 spin_lock(&priv->lock); 591 descptr = priv->tx_remove_ptr; 592 while (priv->tx_free_desc < TX_DCNT) { 593 /* Check for errors */ 594 err = ioread16(ioaddr + MLSR); 595 596 if (err & TX_FIFO_UNDR) 597 dev->stats.tx_fifo_errors++; 598 if (err & (TX_EXCEEDC | TX_LATEC)) 599 dev->stats.tx_carrier_errors++; 600 601 if (descptr->status & DSC_OWNER_MAC) 602 break; /* Not complete */ 603 skb_ptr = descptr->skb_ptr; 604 605 /* Statistic Counter */ 606 dev->stats.tx_packets++; 607 dev->stats.tx_bytes += skb_ptr->len; 608 609 dma_unmap_single(&priv->pdev->dev, le32_to_cpu(descptr->buf), 610 skb_ptr->len, DMA_TO_DEVICE); 611 /* Free buffer */ 612 dev_kfree_skb(skb_ptr); 613 descptr->skb_ptr = NULL; 614 /* To next descriptor */ 615 descptr = descptr->vndescp; 616 priv->tx_free_desc++; 617 } 618 priv->tx_remove_ptr = descptr; 619 620 if (priv->tx_free_desc) 621 netif_wake_queue(dev); 622 spin_unlock(&priv->lock); 623 } 624 625 static int r6040_poll(struct napi_struct *napi, int budget) 626 { 627 struct r6040_private *priv = 628 container_of(napi, struct r6040_private, napi); 629 struct net_device *dev = priv->dev; 630 void __iomem *ioaddr = priv->base; 631 int work_done; 632 633 r6040_tx(dev); 634 635 work_done = r6040_rx(dev, budget); 636 637 if (work_done < budget) { 638 napi_complete_done(napi, work_done); 639 /* Enable RX/TX interrupt */ 640 iowrite16(ioread16(ioaddr + MIER) | RX_INTS | TX_INTS, 641 ioaddr + MIER); 642 } 643 return work_done; 644 } 645 646 /* The RDC interrupt handler. */ 647 static irqreturn_t r6040_interrupt(int irq, void *dev_id) 648 { 649 struct net_device *dev = dev_id; 650 struct r6040_private *lp = netdev_priv(dev); 651 void __iomem *ioaddr = lp->base; 652 u16 misr, status; 653 654 /* Save MIER */ 655 misr = ioread16(ioaddr + MIER); 656 /* Mask off RDC MAC interrupt */ 657 iowrite16(MSK_INT, ioaddr + MIER); 658 /* Read MISR status and clear */ 659 status = ioread16(ioaddr + MISR); 660 661 if (status == 0x0000 || status == 0xffff) { 662 /* Restore RDC MAC interrupt */ 663 iowrite16(misr, ioaddr + MIER); 664 return IRQ_NONE; 665 } 666 667 /* RX interrupt request */ 668 if (status & (RX_INTS | TX_INTS)) { 669 if (status & RX_NO_DESC) { 670 /* RX descriptor unavailable */ 671 dev->stats.rx_dropped++; 672 dev->stats.rx_missed_errors++; 673 } 674 if (status & RX_FIFO_FULL) 675 dev->stats.rx_fifo_errors++; 676 677 if (likely(napi_schedule_prep(&lp->napi))) { 678 /* Mask off RX interrupt */ 679 misr &= ~(RX_INTS | TX_INTS); 680 __napi_schedule_irqoff(&lp->napi); 681 } 682 } 683 684 /* Restore RDC MAC interrupt */ 685 iowrite16(misr, ioaddr + MIER); 686 687 return IRQ_HANDLED; 688 } 689 690 #ifdef CONFIG_NET_POLL_CONTROLLER 691 static void r6040_poll_controller(struct net_device *dev) 692 { 693 disable_irq(dev->irq); 694 r6040_interrupt(dev->irq, dev); 695 enable_irq(dev->irq); 696 } 697 #endif 698 699 /* Init RDC MAC */ 700 static int r6040_up(struct net_device *dev) 701 { 702 struct r6040_private *lp = netdev_priv(dev); 703 void __iomem *ioaddr = lp->base; 704 int ret; 705 706 /* Initialise and alloc RX/TX buffers */ 707 r6040_init_txbufs(dev); 708 ret = r6040_alloc_rxbufs(dev); 709 if (ret) 710 return ret; 711 712 /* improve performance (by RDC guys) */ 713 r6040_phy_write(ioaddr, 30, 17, 714 (r6040_phy_read(ioaddr, 30, 17) | 0x4000)); 715 r6040_phy_write(ioaddr, 30, 17, 716 ~((~r6040_phy_read(ioaddr, 30, 17)) | 0x2000)); 717 r6040_phy_write(ioaddr, 0, 19, 0x0000); 718 r6040_phy_write(ioaddr, 0, 30, 0x01F0); 719 720 /* Initialize all MAC registers */ 721 r6040_init_mac_regs(dev); 722 723 phy_start(dev->phydev); 724 725 return 0; 726 } 727 728 729 /* Read/set MAC address routines */ 730 static void r6040_mac_address(struct net_device *dev) 731 { 732 struct r6040_private *lp = netdev_priv(dev); 733 void __iomem *ioaddr = lp->base; 734 const u16 *adrp; 735 736 /* Reset MAC */ 737 r6040_reset_mac(lp); 738 739 /* Restore MAC Address */ 740 adrp = (const u16 *) dev->dev_addr; 741 iowrite16(adrp[0], ioaddr + MID_0L); 742 iowrite16(adrp[1], ioaddr + MID_0M); 743 iowrite16(adrp[2], ioaddr + MID_0H); 744 } 745 746 static int r6040_open(struct net_device *dev) 747 { 748 struct r6040_private *lp = netdev_priv(dev); 749 int ret; 750 751 /* Request IRQ and Register interrupt handler */ 752 ret = request_irq(dev->irq, r6040_interrupt, 753 IRQF_SHARED, dev->name, dev); 754 if (ret) 755 goto out; 756 757 /* Set MAC address */ 758 r6040_mac_address(dev); 759 760 /* Allocate Descriptor memory */ 761 lp->rx_ring = 762 dma_alloc_coherent(&lp->pdev->dev, RX_DESC_SIZE, 763 &lp->rx_ring_dma, GFP_KERNEL); 764 if (!lp->rx_ring) { 765 ret = -ENOMEM; 766 goto err_free_irq; 767 } 768 769 lp->tx_ring = 770 dma_alloc_coherent(&lp->pdev->dev, TX_DESC_SIZE, 771 &lp->tx_ring_dma, GFP_KERNEL); 772 if (!lp->tx_ring) { 773 ret = -ENOMEM; 774 goto err_free_rx_ring; 775 } 776 777 ret = r6040_up(dev); 778 if (ret) 779 goto err_free_tx_ring; 780 781 napi_enable(&lp->napi); 782 netif_start_queue(dev); 783 784 return 0; 785 786 err_free_tx_ring: 787 dma_free_coherent(&lp->pdev->dev, TX_DESC_SIZE, lp->tx_ring, 788 lp->tx_ring_dma); 789 err_free_rx_ring: 790 dma_free_coherent(&lp->pdev->dev, RX_DESC_SIZE, lp->rx_ring, 791 lp->rx_ring_dma); 792 err_free_irq: 793 free_irq(dev->irq, dev); 794 out: 795 return ret; 796 } 797 798 static netdev_tx_t r6040_start_xmit(struct sk_buff *skb, 799 struct net_device *dev) 800 { 801 struct r6040_private *lp = netdev_priv(dev); 802 struct r6040_descriptor *descptr; 803 void __iomem *ioaddr = lp->base; 804 unsigned long flags; 805 806 if (skb_put_padto(skb, ETH_ZLEN) < 0) 807 return NETDEV_TX_OK; 808 809 /* Critical Section */ 810 spin_lock_irqsave(&lp->lock, flags); 811 812 /* TX resource check */ 813 if (!lp->tx_free_desc) { 814 spin_unlock_irqrestore(&lp->lock, flags); 815 netif_stop_queue(dev); 816 netdev_err(dev, ": no tx descriptor\n"); 817 return NETDEV_TX_BUSY; 818 } 819 820 /* Set TX descriptor & Transmit it */ 821 lp->tx_free_desc--; 822 descptr = lp->tx_insert_ptr; 823 descptr->len = skb->len; 824 descptr->skb_ptr = skb; 825 descptr->buf = cpu_to_le32(dma_map_single(&lp->pdev->dev, skb->data, 826 skb->len, DMA_TO_DEVICE)); 827 descptr->status = DSC_OWNER_MAC; 828 829 skb_tx_timestamp(skb); 830 831 /* Trigger the MAC to check the TX descriptor */ 832 if (!netdev_xmit_more() || netif_queue_stopped(dev)) 833 iowrite16(TM2TX, ioaddr + MTPR); 834 lp->tx_insert_ptr = descptr->vndescp; 835 836 /* If no tx resource, stop */ 837 if (!lp->tx_free_desc) 838 netif_stop_queue(dev); 839 840 spin_unlock_irqrestore(&lp->lock, flags); 841 842 return NETDEV_TX_OK; 843 } 844 845 static void r6040_multicast_list(struct net_device *dev) 846 { 847 struct r6040_private *lp = netdev_priv(dev); 848 void __iomem *ioaddr = lp->base; 849 unsigned long flags; 850 struct netdev_hw_addr *ha; 851 int i; 852 const u16 *adrp; 853 u16 hash_table[4] = { 0 }; 854 855 spin_lock_irqsave(&lp->lock, flags); 856 857 /* Keep our MAC Address */ 858 adrp = (const u16 *)dev->dev_addr; 859 iowrite16(adrp[0], ioaddr + MID_0L); 860 iowrite16(adrp[1], ioaddr + MID_0M); 861 iowrite16(adrp[2], ioaddr + MID_0H); 862 863 /* Clear AMCP & PROM bits */ 864 lp->mcr0 = ioread16(ioaddr + MCR0) & ~(MCR0_PROMISC | MCR0_HASH_EN); 865 866 /* Promiscuous mode */ 867 if (dev->flags & IFF_PROMISC) 868 lp->mcr0 |= MCR0_PROMISC; 869 870 /* Enable multicast hash table function to 871 * receive all multicast packets. */ 872 else if (dev->flags & IFF_ALLMULTI) { 873 lp->mcr0 |= MCR0_HASH_EN; 874 875 for (i = 0; i < MCAST_MAX ; i++) { 876 iowrite16(0, ioaddr + MID_1L + 8 * i); 877 iowrite16(0, ioaddr + MID_1M + 8 * i); 878 iowrite16(0, ioaddr + MID_1H + 8 * i); 879 } 880 881 for (i = 0; i < 4; i++) 882 hash_table[i] = 0xffff; 883 } 884 /* Use internal multicast address registers if the number of 885 * multicast addresses is not greater than MCAST_MAX. */ 886 else if (netdev_mc_count(dev) <= MCAST_MAX) { 887 i = 0; 888 netdev_for_each_mc_addr(ha, dev) { 889 u16 *adrp = (u16 *) ha->addr; 890 iowrite16(adrp[0], ioaddr + MID_1L + 8 * i); 891 iowrite16(adrp[1], ioaddr + MID_1M + 8 * i); 892 iowrite16(adrp[2], ioaddr + MID_1H + 8 * i); 893 i++; 894 } 895 while (i < MCAST_MAX) { 896 iowrite16(0, ioaddr + MID_1L + 8 * i); 897 iowrite16(0, ioaddr + MID_1M + 8 * i); 898 iowrite16(0, ioaddr + MID_1H + 8 * i); 899 i++; 900 } 901 } 902 /* Otherwise, Enable multicast hash table function. */ 903 else { 904 u32 crc; 905 906 lp->mcr0 |= MCR0_HASH_EN; 907 908 for (i = 0; i < MCAST_MAX ; i++) { 909 iowrite16(0, ioaddr + MID_1L + 8 * i); 910 iowrite16(0, ioaddr + MID_1M + 8 * i); 911 iowrite16(0, ioaddr + MID_1H + 8 * i); 912 } 913 914 /* Build multicast hash table */ 915 netdev_for_each_mc_addr(ha, dev) { 916 u8 *addrs = ha->addr; 917 918 crc = ether_crc(ETH_ALEN, addrs); 919 crc >>= 26; 920 hash_table[crc >> 4] |= 1 << (crc & 0xf); 921 } 922 } 923 924 iowrite16(lp->mcr0, ioaddr + MCR0); 925 926 /* Fill the MAC hash tables with their values */ 927 if (lp->mcr0 & MCR0_HASH_EN) { 928 iowrite16(hash_table[0], ioaddr + MAR0); 929 iowrite16(hash_table[1], ioaddr + MAR1); 930 iowrite16(hash_table[2], ioaddr + MAR2); 931 iowrite16(hash_table[3], ioaddr + MAR3); 932 } 933 934 spin_unlock_irqrestore(&lp->lock, flags); 935 } 936 937 static void netdev_get_drvinfo(struct net_device *dev, 938 struct ethtool_drvinfo *info) 939 { 940 struct r6040_private *rp = netdev_priv(dev); 941 942 strscpy(info->driver, DRV_NAME, sizeof(info->driver)); 943 strscpy(info->version, DRV_VERSION, sizeof(info->version)); 944 strscpy(info->bus_info, pci_name(rp->pdev), sizeof(info->bus_info)); 945 } 946 947 static const struct ethtool_ops netdev_ethtool_ops = { 948 .get_drvinfo = netdev_get_drvinfo, 949 .get_link = ethtool_op_get_link, 950 .get_ts_info = ethtool_op_get_ts_info, 951 .get_link_ksettings = phy_ethtool_get_link_ksettings, 952 .set_link_ksettings = phy_ethtool_set_link_ksettings, 953 .nway_reset = phy_ethtool_nway_reset, 954 }; 955 956 static const struct net_device_ops r6040_netdev_ops = { 957 .ndo_open = r6040_open, 958 .ndo_stop = r6040_close, 959 .ndo_start_xmit = r6040_start_xmit, 960 .ndo_get_stats = r6040_get_stats, 961 .ndo_set_rx_mode = r6040_multicast_list, 962 .ndo_validate_addr = eth_validate_addr, 963 .ndo_set_mac_address = eth_mac_addr, 964 .ndo_eth_ioctl = phy_do_ioctl, 965 .ndo_tx_timeout = r6040_tx_timeout, 966 #ifdef CONFIG_NET_POLL_CONTROLLER 967 .ndo_poll_controller = r6040_poll_controller, 968 #endif 969 }; 970 971 static void r6040_adjust_link(struct net_device *dev) 972 { 973 struct r6040_private *lp = netdev_priv(dev); 974 struct phy_device *phydev = dev->phydev; 975 int status_changed = 0; 976 void __iomem *ioaddr = lp->base; 977 978 BUG_ON(!phydev); 979 980 if (lp->old_link != phydev->link) { 981 status_changed = 1; 982 lp->old_link = phydev->link; 983 } 984 985 /* reflect duplex change */ 986 if (phydev->link && (lp->old_duplex != phydev->duplex)) { 987 lp->mcr0 |= (phydev->duplex == DUPLEX_FULL ? MCR0_FD : 0); 988 iowrite16(lp->mcr0, ioaddr); 989 990 status_changed = 1; 991 lp->old_duplex = phydev->duplex; 992 } 993 994 if (status_changed) 995 phy_print_status(phydev); 996 } 997 998 static int r6040_mii_probe(struct net_device *dev) 999 { 1000 struct r6040_private *lp = netdev_priv(dev); 1001 struct phy_device *phydev = NULL; 1002 1003 phydev = phy_find_first(lp->mii_bus); 1004 if (!phydev) { 1005 dev_err(&lp->pdev->dev, "no PHY found\n"); 1006 return -ENODEV; 1007 } 1008 1009 phydev = phy_connect(dev, phydev_name(phydev), &r6040_adjust_link, 1010 PHY_INTERFACE_MODE_MII); 1011 1012 if (IS_ERR(phydev)) { 1013 dev_err(&lp->pdev->dev, "could not attach to PHY\n"); 1014 return PTR_ERR(phydev); 1015 } 1016 1017 phy_set_max_speed(phydev, SPEED_100); 1018 1019 lp->old_link = 0; 1020 lp->old_duplex = -1; 1021 1022 phy_attached_info(phydev); 1023 1024 return 0; 1025 } 1026 1027 static int r6040_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) 1028 { 1029 struct net_device *dev; 1030 struct r6040_private *lp; 1031 void __iomem *ioaddr; 1032 int err, io_size = R6040_IO_SIZE; 1033 static int card_idx = -1; 1034 u16 addr[ETH_ALEN / 2]; 1035 int bar = 0; 1036 1037 pr_info("%s\n", version); 1038 1039 err = pci_enable_device(pdev); 1040 if (err) 1041 goto err_out; 1042 1043 /* this should always be supported */ 1044 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 1045 if (err) { 1046 dev_err(&pdev->dev, "32-bit PCI DMA addresses not supported by the card\n"); 1047 goto err_out_disable_dev; 1048 } 1049 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 1050 if (err) { 1051 dev_err(&pdev->dev, "32-bit PCI DMA addresses not supported by the card\n"); 1052 goto err_out_disable_dev; 1053 } 1054 1055 /* IO Size check */ 1056 if (pci_resource_len(pdev, bar) < io_size) { 1057 dev_err(&pdev->dev, "Insufficient PCI resources, aborting\n"); 1058 err = -EIO; 1059 goto err_out_disable_dev; 1060 } 1061 1062 pci_set_master(pdev); 1063 1064 dev = alloc_etherdev(sizeof(struct r6040_private)); 1065 if (!dev) { 1066 err = -ENOMEM; 1067 goto err_out_disable_dev; 1068 } 1069 SET_NETDEV_DEV(dev, &pdev->dev); 1070 lp = netdev_priv(dev); 1071 1072 err = pci_request_regions(pdev, DRV_NAME); 1073 1074 if (err) { 1075 dev_err(&pdev->dev, "Failed to request PCI regions\n"); 1076 goto err_out_free_dev; 1077 } 1078 1079 ioaddr = pci_iomap(pdev, bar, io_size); 1080 if (!ioaddr) { 1081 dev_err(&pdev->dev, "ioremap failed for device\n"); 1082 err = -EIO; 1083 goto err_out_free_res; 1084 } 1085 1086 /* If PHY status change register is still set to zero it means the 1087 * bootloader didn't initialize it, so we set it to: 1088 * - enable phy status change 1089 * - enable all phy addresses 1090 * - set to lowest timer divider */ 1091 if (ioread16(ioaddr + PHY_CC) == 0) 1092 iowrite16(SCEN | PHY_MAX_ADDR << PHYAD_SHIFT | 1093 7 << TMRDIV_SHIFT, ioaddr + PHY_CC); 1094 1095 /* Init system & device */ 1096 lp->base = ioaddr; 1097 dev->irq = pdev->irq; 1098 1099 spin_lock_init(&lp->lock); 1100 pci_set_drvdata(pdev, dev); 1101 1102 /* Set MAC address */ 1103 card_idx++; 1104 1105 addr[0] = ioread16(ioaddr + MID_0L); 1106 addr[1] = ioread16(ioaddr + MID_0M); 1107 addr[2] = ioread16(ioaddr + MID_0H); 1108 eth_hw_addr_set(dev, (u8 *)addr); 1109 1110 /* Some bootloader/BIOSes do not initialize 1111 * MAC address, warn about that */ 1112 if (!(addr[0] || addr[1] || addr[2])) { 1113 netdev_warn(dev, "MAC address not initialized, " 1114 "generating random\n"); 1115 eth_hw_addr_random(dev); 1116 } 1117 1118 /* Link new device into r6040_root_dev */ 1119 lp->pdev = pdev; 1120 lp->dev = dev; 1121 1122 /* Init RDC private data */ 1123 lp->mcr0 = MCR0_XMTEN | MCR0_RCVEN; 1124 1125 /* The RDC-specific entries in the device structure. */ 1126 dev->netdev_ops = &r6040_netdev_ops; 1127 dev->ethtool_ops = &netdev_ethtool_ops; 1128 dev->watchdog_timeo = TX_TIMEOUT; 1129 1130 netif_napi_add(dev, &lp->napi, r6040_poll); 1131 1132 lp->mii_bus = mdiobus_alloc(); 1133 if (!lp->mii_bus) { 1134 dev_err(&pdev->dev, "mdiobus_alloc() failed\n"); 1135 err = -ENOMEM; 1136 goto err_out_unmap; 1137 } 1138 1139 lp->mii_bus->priv = dev; 1140 lp->mii_bus->read = r6040_mdiobus_read; 1141 lp->mii_bus->write = r6040_mdiobus_write; 1142 lp->mii_bus->name = "r6040_eth_mii"; 1143 snprintf(lp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x", 1144 dev_name(&pdev->dev), card_idx); 1145 1146 err = mdiobus_register(lp->mii_bus); 1147 if (err) { 1148 dev_err(&pdev->dev, "failed to register MII bus\n"); 1149 goto err_out_mdio; 1150 } 1151 1152 err = r6040_mii_probe(dev); 1153 if (err) { 1154 dev_err(&pdev->dev, "failed to probe MII bus\n"); 1155 goto err_out_mdio_unregister; 1156 } 1157 1158 /* Register net device. After this dev->name assign */ 1159 err = register_netdev(dev); 1160 if (err) { 1161 dev_err(&pdev->dev, "Failed to register net device\n"); 1162 goto err_out_phy_disconnect; 1163 } 1164 return 0; 1165 1166 err_out_phy_disconnect: 1167 phy_disconnect(dev->phydev); 1168 err_out_mdio_unregister: 1169 mdiobus_unregister(lp->mii_bus); 1170 err_out_mdio: 1171 mdiobus_free(lp->mii_bus); 1172 err_out_unmap: 1173 netif_napi_del(&lp->napi); 1174 pci_iounmap(pdev, ioaddr); 1175 err_out_free_res: 1176 pci_release_regions(pdev); 1177 err_out_free_dev: 1178 free_netdev(dev); 1179 err_out_disable_dev: 1180 pci_disable_device(pdev); 1181 err_out: 1182 return err; 1183 } 1184 1185 static void r6040_remove_one(struct pci_dev *pdev) 1186 { 1187 struct net_device *dev = pci_get_drvdata(pdev); 1188 struct r6040_private *lp = netdev_priv(dev); 1189 1190 unregister_netdev(dev); 1191 phy_disconnect(dev->phydev); 1192 mdiobus_unregister(lp->mii_bus); 1193 mdiobus_free(lp->mii_bus); 1194 netif_napi_del(&lp->napi); 1195 pci_iounmap(pdev, lp->base); 1196 pci_release_regions(pdev); 1197 free_netdev(dev); 1198 pci_disable_device(pdev); 1199 } 1200 1201 1202 static const struct pci_device_id r6040_pci_tbl[] = { 1203 { PCI_DEVICE(PCI_VENDOR_ID_RDC, 0x6040) }, 1204 { 0 } 1205 }; 1206 MODULE_DEVICE_TABLE(pci, r6040_pci_tbl); 1207 1208 static struct pci_driver r6040_driver = { 1209 .name = DRV_NAME, 1210 .id_table = r6040_pci_tbl, 1211 .probe = r6040_init_one, 1212 .remove = r6040_remove_one, 1213 }; 1214 1215 module_pci_driver(r6040_driver); 1216