1 /* 2 * Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device. 3 * 4 * This is a new flat driver which is based on the original emac_lite 5 * driver from John Williams <john.williams@xilinx.com>. 6 * 7 * 2007 - 2013 (c) Xilinx, Inc. 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/uaccess.h> 17 #include <linux/netdevice.h> 18 #include <linux/etherdevice.h> 19 #include <linux/skbuff.h> 20 #include <linux/io.h> 21 #include <linux/slab.h> 22 #include <linux/of_address.h> 23 #include <linux/of_device.h> 24 #include <linux/of_platform.h> 25 #include <linux/of_mdio.h> 26 #include <linux/of_net.h> 27 #include <linux/phy.h> 28 #include <linux/interrupt.h> 29 30 #define DRIVER_NAME "xilinx_emaclite" 31 32 /* Register offsets for the EmacLite Core */ 33 #define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */ 34 #define XEL_MDIOADDR_OFFSET 0x07E4 /* MDIO Address Register */ 35 #define XEL_MDIOWR_OFFSET 0x07E8 /* MDIO Write Data Register */ 36 #define XEL_MDIORD_OFFSET 0x07EC /* MDIO Read Data Register */ 37 #define XEL_MDIOCTRL_OFFSET 0x07F0 /* MDIO Control Register */ 38 #define XEL_GIER_OFFSET 0x07F8 /* GIE Register */ 39 #define XEL_TSR_OFFSET 0x07FC /* Tx status */ 40 #define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */ 41 42 #define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */ 43 #define XEL_RPLR_OFFSET 0x100C /* Rx packet length */ 44 #define XEL_RSR_OFFSET 0x17FC /* Rx status */ 45 46 #define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */ 47 48 /* MDIO Address Register Bit Masks */ 49 #define XEL_MDIOADDR_REGADR_MASK 0x0000001F /* Register Address */ 50 #define XEL_MDIOADDR_PHYADR_MASK 0x000003E0 /* PHY Address */ 51 #define XEL_MDIOADDR_PHYADR_SHIFT 5 52 #define XEL_MDIOADDR_OP_MASK 0x00000400 /* RD/WR Operation */ 53 54 /* MDIO Write Data Register Bit Masks */ 55 #define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */ 56 57 /* MDIO Read Data Register Bit Masks */ 58 #define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */ 59 60 /* MDIO Control Register Bit Masks */ 61 #define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001 /* MDIO Status Mask */ 62 #define XEL_MDIOCTRL_MDIOEN_MASK 0x00000008 /* MDIO Enable */ 63 64 /* Global Interrupt Enable Register (GIER) Bit Masks */ 65 #define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */ 66 67 /* Transmit Status Register (TSR) Bit Masks */ 68 #define XEL_TSR_XMIT_BUSY_MASK 0x00000001 /* Tx complete */ 69 #define XEL_TSR_PROGRAM_MASK 0x00000002 /* Program the MAC address */ 70 #define XEL_TSR_XMIT_IE_MASK 0x00000008 /* Tx interrupt enable bit */ 71 #define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000 /* Buffer is active, SW bit 72 * only. This is not documented 73 * in the HW spec */ 74 75 /* Define for programming the MAC address into the EmacLite */ 76 #define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK) 77 78 /* Receive Status Register (RSR) */ 79 #define XEL_RSR_RECV_DONE_MASK 0x00000001 /* Rx complete */ 80 #define XEL_RSR_RECV_IE_MASK 0x00000008 /* Rx interrupt enable bit */ 81 82 /* Transmit Packet Length Register (TPLR) */ 83 #define XEL_TPLR_LENGTH_MASK 0x0000FFFF /* Tx packet length */ 84 85 /* Receive Packet Length Register (RPLR) */ 86 #define XEL_RPLR_LENGTH_MASK 0x0000FFFF /* Rx packet length */ 87 88 #define XEL_HEADER_OFFSET 12 /* Offset to length field */ 89 #define XEL_HEADER_SHIFT 16 /* Shift value for length */ 90 91 /* General Ethernet Definitions */ 92 #define XEL_ARP_PACKET_SIZE 28 /* Max ARP packet size */ 93 #define XEL_HEADER_IP_LENGTH_OFFSET 16 /* IP Length Offset */ 94 95 96 97 #define TX_TIMEOUT (60*HZ) /* Tx timeout is 60 seconds. */ 98 #define ALIGNMENT 4 99 100 /* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */ 101 #define BUFFER_ALIGN(adr) ((ALIGNMENT - ((u32) adr)) % ALIGNMENT) 102 103 /** 104 * struct net_local - Our private per device data 105 * @ndev: instance of the network device 106 * @tx_ping_pong: indicates whether Tx Pong buffer is configured in HW 107 * @rx_ping_pong: indicates whether Rx Pong buffer is configured in HW 108 * @next_tx_buf_to_use: next Tx buffer to write to 109 * @next_rx_buf_to_use: next Rx buffer to read from 110 * @base_addr: base address of the Emaclite device 111 * @reset_lock: lock used for synchronization 112 * @deferred_skb: holds an skb (for transmission at a later time) when the 113 * Tx buffer is not free 114 * @phy_dev: pointer to the PHY device 115 * @phy_node: pointer to the PHY device node 116 * @mii_bus: pointer to the MII bus 117 * @last_link: last link status 118 * @has_mdio: indicates whether MDIO is included in the HW 119 */ 120 struct net_local { 121 122 struct net_device *ndev; 123 124 bool tx_ping_pong; 125 bool rx_ping_pong; 126 u32 next_tx_buf_to_use; 127 u32 next_rx_buf_to_use; 128 void __iomem *base_addr; 129 130 spinlock_t reset_lock; 131 struct sk_buff *deferred_skb; 132 133 struct phy_device *phy_dev; 134 struct device_node *phy_node; 135 136 struct mii_bus *mii_bus; 137 138 int last_link; 139 bool has_mdio; 140 }; 141 142 143 /*************************/ 144 /* EmacLite driver calls */ 145 /*************************/ 146 147 /** 148 * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device 149 * @drvdata: Pointer to the Emaclite device private data 150 * 151 * This function enables the Tx and Rx interrupts for the Emaclite device along 152 * with the Global Interrupt Enable. 153 */ 154 static void xemaclite_enable_interrupts(struct net_local *drvdata) 155 { 156 u32 reg_data; 157 158 /* Enable the Tx interrupts for the first Buffer */ 159 reg_data = __raw_readl(drvdata->base_addr + XEL_TSR_OFFSET); 160 __raw_writel(reg_data | XEL_TSR_XMIT_IE_MASK, 161 drvdata->base_addr + XEL_TSR_OFFSET); 162 163 /* Enable the Rx interrupts for the first buffer */ 164 __raw_writel(XEL_RSR_RECV_IE_MASK, drvdata->base_addr + XEL_RSR_OFFSET); 165 166 /* Enable the Global Interrupt Enable */ 167 __raw_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET); 168 } 169 170 /** 171 * xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device 172 * @drvdata: Pointer to the Emaclite device private data 173 * 174 * This function disables the Tx and Rx interrupts for the Emaclite device, 175 * along with the Global Interrupt Enable. 176 */ 177 static void xemaclite_disable_interrupts(struct net_local *drvdata) 178 { 179 u32 reg_data; 180 181 /* Disable the Global Interrupt Enable */ 182 __raw_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET); 183 184 /* Disable the Tx interrupts for the first buffer */ 185 reg_data = __raw_readl(drvdata->base_addr + XEL_TSR_OFFSET); 186 __raw_writel(reg_data & (~XEL_TSR_XMIT_IE_MASK), 187 drvdata->base_addr + XEL_TSR_OFFSET); 188 189 /* Disable the Rx interrupts for the first buffer */ 190 reg_data = __raw_readl(drvdata->base_addr + XEL_RSR_OFFSET); 191 __raw_writel(reg_data & (~XEL_RSR_RECV_IE_MASK), 192 drvdata->base_addr + XEL_RSR_OFFSET); 193 } 194 195 /** 196 * xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address 197 * @src_ptr: Void pointer to the 16-bit aligned source address 198 * @dest_ptr: Pointer to the 32-bit aligned destination address 199 * @length: Number bytes to write from source to destination 200 * 201 * This function writes data from a 16-bit aligned buffer to a 32-bit aligned 202 * address in the EmacLite device. 203 */ 204 static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr, 205 unsigned length) 206 { 207 u32 align_buffer; 208 u32 *to_u32_ptr; 209 u16 *from_u16_ptr, *to_u16_ptr; 210 211 to_u32_ptr = dest_ptr; 212 from_u16_ptr = src_ptr; 213 align_buffer = 0; 214 215 for (; length > 3; length -= 4) { 216 to_u16_ptr = (u16 *)&align_buffer; 217 *to_u16_ptr++ = *from_u16_ptr++; 218 *to_u16_ptr++ = *from_u16_ptr++; 219 220 /* This barrier resolves occasional issues seen around 221 * cases where the data is not properly flushed out 222 * from the processor store buffers to the destination 223 * memory locations. 224 */ 225 wmb(); 226 227 /* Output a word */ 228 *to_u32_ptr++ = align_buffer; 229 } 230 if (length) { 231 u8 *from_u8_ptr, *to_u8_ptr; 232 233 /* Set up to output the remaining data */ 234 align_buffer = 0; 235 to_u8_ptr = (u8 *) &align_buffer; 236 from_u8_ptr = (u8 *) from_u16_ptr; 237 238 /* Output the remaining data */ 239 for (; length > 0; length--) 240 *to_u8_ptr++ = *from_u8_ptr++; 241 242 /* This barrier resolves occasional issues seen around 243 * cases where the data is not properly flushed out 244 * from the processor store buffers to the destination 245 * memory locations. 246 */ 247 wmb(); 248 *to_u32_ptr = align_buffer; 249 } 250 } 251 252 /** 253 * xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer 254 * @src_ptr: Pointer to the 32-bit aligned source address 255 * @dest_ptr: Pointer to the 16-bit aligned destination address 256 * @length: Number bytes to read from source to destination 257 * 258 * This function reads data from a 32-bit aligned address in the EmacLite device 259 * to a 16-bit aligned buffer. 260 */ 261 static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr, 262 unsigned length) 263 { 264 u16 *to_u16_ptr, *from_u16_ptr; 265 u32 *from_u32_ptr; 266 u32 align_buffer; 267 268 from_u32_ptr = src_ptr; 269 to_u16_ptr = (u16 *) dest_ptr; 270 271 for (; length > 3; length -= 4) { 272 /* Copy each word into the temporary buffer */ 273 align_buffer = *from_u32_ptr++; 274 from_u16_ptr = (u16 *)&align_buffer; 275 276 /* Read data from source */ 277 *to_u16_ptr++ = *from_u16_ptr++; 278 *to_u16_ptr++ = *from_u16_ptr++; 279 } 280 281 if (length) { 282 u8 *to_u8_ptr, *from_u8_ptr; 283 284 /* Set up to read the remaining data */ 285 to_u8_ptr = (u8 *) to_u16_ptr; 286 align_buffer = *from_u32_ptr++; 287 from_u8_ptr = (u8 *) &align_buffer; 288 289 /* Read the remaining data */ 290 for (; length > 0; length--) 291 *to_u8_ptr = *from_u8_ptr; 292 } 293 } 294 295 /** 296 * xemaclite_send_data - Send an Ethernet frame 297 * @drvdata: Pointer to the Emaclite device private data 298 * @data: Pointer to the data to be sent 299 * @byte_count: Total frame size, including header 300 * 301 * This function checks if the Tx buffer of the Emaclite device is free to send 302 * data. If so, it fills the Tx buffer with data for transmission. Otherwise, it 303 * returns an error. 304 * 305 * Return: 0 upon success or -1 if the buffer(s) are full. 306 * 307 * Note: The maximum Tx packet size can not be more than Ethernet header 308 * (14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS. 309 */ 310 static int xemaclite_send_data(struct net_local *drvdata, u8 *data, 311 unsigned int byte_count) 312 { 313 u32 reg_data; 314 void __iomem *addr; 315 316 /* Determine the expected Tx buffer address */ 317 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use; 318 319 /* If the length is too large, truncate it */ 320 if (byte_count > ETH_FRAME_LEN) 321 byte_count = ETH_FRAME_LEN; 322 323 /* Check if the expected buffer is available */ 324 reg_data = __raw_readl(addr + XEL_TSR_OFFSET); 325 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK | 326 XEL_TSR_XMIT_ACTIVE_MASK)) == 0) { 327 328 /* Switch to next buffer if configured */ 329 if (drvdata->tx_ping_pong != 0) 330 drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET; 331 } else if (drvdata->tx_ping_pong != 0) { 332 /* If the expected buffer is full, try the other buffer, 333 * if it is configured in HW */ 334 335 addr = (void __iomem __force *)((u32 __force)addr ^ 336 XEL_BUFFER_OFFSET); 337 reg_data = __raw_readl(addr + XEL_TSR_OFFSET); 338 339 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK | 340 XEL_TSR_XMIT_ACTIVE_MASK)) != 0) 341 return -1; /* Buffers were full, return failure */ 342 } else 343 return -1; /* Buffer was full, return failure */ 344 345 /* Write the frame to the buffer */ 346 xemaclite_aligned_write(data, (u32 __force *) addr, byte_count); 347 348 __raw_writel((byte_count & XEL_TPLR_LENGTH_MASK), 349 addr + XEL_TPLR_OFFSET); 350 351 /* Update the Tx Status Register to indicate that there is a 352 * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which 353 * is used by the interrupt handler to check whether a frame 354 * has been transmitted */ 355 reg_data = __raw_readl(addr + XEL_TSR_OFFSET); 356 reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK); 357 __raw_writel(reg_data, addr + XEL_TSR_OFFSET); 358 359 return 0; 360 } 361 362 /** 363 * xemaclite_recv_data - Receive a frame 364 * @drvdata: Pointer to the Emaclite device private data 365 * @data: Address where the data is to be received 366 * 367 * This function is intended to be called from the interrupt context or 368 * with a wrapper which waits for the receive frame to be available. 369 * 370 * Return: Total number of bytes received 371 */ 372 static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data) 373 { 374 void __iomem *addr; 375 u16 length, proto_type; 376 u32 reg_data; 377 378 /* Determine the expected buffer address */ 379 addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use); 380 381 /* Verify which buffer has valid data */ 382 reg_data = __raw_readl(addr + XEL_RSR_OFFSET); 383 384 if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) { 385 if (drvdata->rx_ping_pong != 0) 386 drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET; 387 } else { 388 /* The instance is out of sync, try other buffer if other 389 * buffer is configured, return 0 otherwise. If the instance is 390 * out of sync, do not update the 'next_rx_buf_to_use' since it 391 * will correct on subsequent calls */ 392 if (drvdata->rx_ping_pong != 0) 393 addr = (void __iomem __force *)((u32 __force)addr ^ 394 XEL_BUFFER_OFFSET); 395 else 396 return 0; /* No data was available */ 397 398 /* Verify that buffer has valid data */ 399 reg_data = __raw_readl(addr + XEL_RSR_OFFSET); 400 if ((reg_data & XEL_RSR_RECV_DONE_MASK) != 401 XEL_RSR_RECV_DONE_MASK) 402 return 0; /* No data was available */ 403 } 404 405 /* Get the protocol type of the ethernet frame that arrived */ 406 proto_type = ((ntohl(__raw_readl(addr + XEL_HEADER_OFFSET + 407 XEL_RXBUFF_OFFSET)) >> XEL_HEADER_SHIFT) & 408 XEL_RPLR_LENGTH_MASK); 409 410 /* Check if received ethernet frame is a raw ethernet frame 411 * or an IP packet or an ARP packet */ 412 if (proto_type > (ETH_FRAME_LEN + ETH_FCS_LEN)) { 413 414 if (proto_type == ETH_P_IP) { 415 length = ((ntohl(__raw_readl(addr + 416 XEL_HEADER_IP_LENGTH_OFFSET + 417 XEL_RXBUFF_OFFSET)) >> 418 XEL_HEADER_SHIFT) & 419 XEL_RPLR_LENGTH_MASK); 420 length += ETH_HLEN + ETH_FCS_LEN; 421 422 } else if (proto_type == ETH_P_ARP) 423 length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN; 424 else 425 /* Field contains type other than IP or ARP, use max 426 * frame size and let user parse it */ 427 length = ETH_FRAME_LEN + ETH_FCS_LEN; 428 } else 429 /* Use the length in the frame, plus the header and trailer */ 430 length = proto_type + ETH_HLEN + ETH_FCS_LEN; 431 432 /* Read from the EmacLite device */ 433 xemaclite_aligned_read((u32 __force *) (addr + XEL_RXBUFF_OFFSET), 434 data, length); 435 436 /* Acknowledge the frame */ 437 reg_data = __raw_readl(addr + XEL_RSR_OFFSET); 438 reg_data &= ~XEL_RSR_RECV_DONE_MASK; 439 __raw_writel(reg_data, addr + XEL_RSR_OFFSET); 440 441 return length; 442 } 443 444 /** 445 * xemaclite_update_address - Update the MAC address in the device 446 * @drvdata: Pointer to the Emaclite device private data 447 * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value) 448 * 449 * Tx must be idle and Rx should be idle for deterministic results. 450 * It is recommended that this function should be called after the 451 * initialization and before transmission of any packets from the device. 452 * The MAC address can be programmed using any of the two transmit 453 * buffers (if configured). 454 */ 455 static void xemaclite_update_address(struct net_local *drvdata, 456 u8 *address_ptr) 457 { 458 void __iomem *addr; 459 u32 reg_data; 460 461 /* Determine the expected Tx buffer address */ 462 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use; 463 464 xemaclite_aligned_write(address_ptr, (u32 __force *) addr, ETH_ALEN); 465 466 __raw_writel(ETH_ALEN, addr + XEL_TPLR_OFFSET); 467 468 /* Update the MAC address in the EmacLite */ 469 reg_data = __raw_readl(addr + XEL_TSR_OFFSET); 470 __raw_writel(reg_data | XEL_TSR_PROG_MAC_ADDR, addr + XEL_TSR_OFFSET); 471 472 /* Wait for EmacLite to finish with the MAC address update */ 473 while ((__raw_readl(addr + XEL_TSR_OFFSET) & 474 XEL_TSR_PROG_MAC_ADDR) != 0) 475 ; 476 } 477 478 /** 479 * xemaclite_set_mac_address - Set the MAC address for this device 480 * @dev: Pointer to the network device instance 481 * @addr: Void pointer to the sockaddr structure 482 * 483 * This function copies the HW address from the sockaddr strucutre to the 484 * net_device structure and updates the address in HW. 485 * 486 * Return: Error if the net device is busy or 0 if the addr is set 487 * successfully 488 */ 489 static int xemaclite_set_mac_address(struct net_device *dev, void *address) 490 { 491 struct net_local *lp = netdev_priv(dev); 492 struct sockaddr *addr = address; 493 494 if (netif_running(dev)) 495 return -EBUSY; 496 497 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); 498 xemaclite_update_address(lp, dev->dev_addr); 499 return 0; 500 } 501 502 /** 503 * xemaclite_tx_timeout - Callback for Tx Timeout 504 * @dev: Pointer to the network device 505 * 506 * This function is called when Tx time out occurs for Emaclite device. 507 */ 508 static void xemaclite_tx_timeout(struct net_device *dev) 509 { 510 struct net_local *lp = netdev_priv(dev); 511 unsigned long flags; 512 513 dev_err(&lp->ndev->dev, "Exceeded transmit timeout of %lu ms\n", 514 TX_TIMEOUT * 1000UL / HZ); 515 516 dev->stats.tx_errors++; 517 518 /* Reset the device */ 519 spin_lock_irqsave(&lp->reset_lock, flags); 520 521 /* Shouldn't really be necessary, but shouldn't hurt */ 522 netif_stop_queue(dev); 523 524 xemaclite_disable_interrupts(lp); 525 xemaclite_enable_interrupts(lp); 526 527 if (lp->deferred_skb) { 528 dev_kfree_skb(lp->deferred_skb); 529 lp->deferred_skb = NULL; 530 dev->stats.tx_errors++; 531 } 532 533 /* To exclude tx timeout */ 534 netif_trans_update(dev); /* prevent tx timeout */ 535 536 /* We're all ready to go. Start the queue */ 537 netif_wake_queue(dev); 538 spin_unlock_irqrestore(&lp->reset_lock, flags); 539 } 540 541 /**********************/ 542 /* Interrupt Handlers */ 543 /**********************/ 544 545 /** 546 * xemaclite_tx_handler - Interrupt handler for frames sent 547 * @dev: Pointer to the network device 548 * 549 * This function updates the number of packets transmitted and handles the 550 * deferred skb, if there is one. 551 */ 552 static void xemaclite_tx_handler(struct net_device *dev) 553 { 554 struct net_local *lp = netdev_priv(dev); 555 556 dev->stats.tx_packets++; 557 if (lp->deferred_skb) { 558 if (xemaclite_send_data(lp, 559 (u8 *) lp->deferred_skb->data, 560 lp->deferred_skb->len) != 0) 561 return; 562 else { 563 dev->stats.tx_bytes += lp->deferred_skb->len; 564 dev_kfree_skb_irq(lp->deferred_skb); 565 lp->deferred_skb = NULL; 566 netif_trans_update(dev); /* prevent tx timeout */ 567 netif_wake_queue(dev); 568 } 569 } 570 } 571 572 /** 573 * xemaclite_rx_handler- Interrupt handler for frames received 574 * @dev: Pointer to the network device 575 * 576 * This function allocates memory for a socket buffer, fills it with data 577 * received and hands it over to the TCP/IP stack. 578 */ 579 static void xemaclite_rx_handler(struct net_device *dev) 580 { 581 struct net_local *lp = netdev_priv(dev); 582 struct sk_buff *skb; 583 unsigned int align; 584 u32 len; 585 586 len = ETH_FRAME_LEN + ETH_FCS_LEN; 587 skb = netdev_alloc_skb(dev, len + ALIGNMENT); 588 if (!skb) { 589 /* Couldn't get memory. */ 590 dev->stats.rx_dropped++; 591 dev_err(&lp->ndev->dev, "Could not allocate receive buffer\n"); 592 return; 593 } 594 595 /* 596 * A new skb should have the data halfword aligned, but this code is 597 * here just in case that isn't true. Calculate how many 598 * bytes we should reserve to get the data to start on a word 599 * boundary */ 600 align = BUFFER_ALIGN(skb->data); 601 if (align) 602 skb_reserve(skb, align); 603 604 skb_reserve(skb, 2); 605 606 len = xemaclite_recv_data(lp, (u8 *) skb->data); 607 608 if (!len) { 609 dev->stats.rx_errors++; 610 dev_kfree_skb_irq(skb); 611 return; 612 } 613 614 skb_put(skb, len); /* Tell the skb how much data we got */ 615 616 skb->protocol = eth_type_trans(skb, dev); 617 skb_checksum_none_assert(skb); 618 619 dev->stats.rx_packets++; 620 dev->stats.rx_bytes += len; 621 622 if (!skb_defer_rx_timestamp(skb)) 623 netif_rx(skb); /* Send the packet upstream */ 624 } 625 626 /** 627 * xemaclite_interrupt - Interrupt handler for this driver 628 * @irq: Irq of the Emaclite device 629 * @dev_id: Void pointer to the network device instance used as callback 630 * reference 631 * 632 * This function handles the Tx and Rx interrupts of the EmacLite device. 633 */ 634 static irqreturn_t xemaclite_interrupt(int irq, void *dev_id) 635 { 636 bool tx_complete = false; 637 struct net_device *dev = dev_id; 638 struct net_local *lp = netdev_priv(dev); 639 void __iomem *base_addr = lp->base_addr; 640 u32 tx_status; 641 642 /* Check if there is Rx Data available */ 643 if ((__raw_readl(base_addr + XEL_RSR_OFFSET) & 644 XEL_RSR_RECV_DONE_MASK) || 645 (__raw_readl(base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET) 646 & XEL_RSR_RECV_DONE_MASK)) 647 648 xemaclite_rx_handler(dev); 649 650 /* Check if the Transmission for the first buffer is completed */ 651 tx_status = __raw_readl(base_addr + XEL_TSR_OFFSET); 652 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) && 653 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) { 654 655 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK; 656 __raw_writel(tx_status, base_addr + XEL_TSR_OFFSET); 657 658 tx_complete = true; 659 } 660 661 /* Check if the Transmission for the second buffer is completed */ 662 tx_status = __raw_readl(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET); 663 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) && 664 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) { 665 666 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK; 667 __raw_writel(tx_status, base_addr + XEL_BUFFER_OFFSET + 668 XEL_TSR_OFFSET); 669 670 tx_complete = true; 671 } 672 673 /* If there was a Tx interrupt, call the Tx Handler */ 674 if (tx_complete != 0) 675 xemaclite_tx_handler(dev); 676 677 return IRQ_HANDLED; 678 } 679 680 /**********************/ 681 /* MDIO Bus functions */ 682 /**********************/ 683 684 /** 685 * xemaclite_mdio_wait - Wait for the MDIO to be ready to use 686 * @lp: Pointer to the Emaclite device private data 687 * 688 * This function waits till the device is ready to accept a new MDIO 689 * request. 690 * 691 * Return: 0 for success or ETIMEDOUT for a timeout 692 */ 693 694 static int xemaclite_mdio_wait(struct net_local *lp) 695 { 696 unsigned long end = jiffies + 2; 697 698 /* wait for the MDIO interface to not be busy or timeout 699 after some time. 700 */ 701 while (__raw_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET) & 702 XEL_MDIOCTRL_MDIOSTS_MASK) { 703 if (time_before_eq(end, jiffies)) { 704 WARN_ON(1); 705 return -ETIMEDOUT; 706 } 707 msleep(1); 708 } 709 return 0; 710 } 711 712 /** 713 * xemaclite_mdio_read - Read from a given MII management register 714 * @bus: the mii_bus struct 715 * @phy_id: the phy address 716 * @reg: register number to read from 717 * 718 * This function waits till the device is ready to accept a new MDIO 719 * request and then writes the phy address to the MDIO Address register 720 * and reads data from MDIO Read Data register, when its available. 721 * 722 * Return: Value read from the MII management register 723 */ 724 static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg) 725 { 726 struct net_local *lp = bus->priv; 727 u32 ctrl_reg; 728 u32 rc; 729 730 if (xemaclite_mdio_wait(lp)) 731 return -ETIMEDOUT; 732 733 /* Write the PHY address, register number and set the OP bit in the 734 * MDIO Address register. Set the Status bit in the MDIO Control 735 * register to start a MDIO read transaction. 736 */ 737 ctrl_reg = __raw_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET); 738 __raw_writel(XEL_MDIOADDR_OP_MASK | 739 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg), 740 lp->base_addr + XEL_MDIOADDR_OFFSET); 741 __raw_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK, 742 lp->base_addr + XEL_MDIOCTRL_OFFSET); 743 744 if (xemaclite_mdio_wait(lp)) 745 return -ETIMEDOUT; 746 747 rc = __raw_readl(lp->base_addr + XEL_MDIORD_OFFSET); 748 749 dev_dbg(&lp->ndev->dev, 750 "xemaclite_mdio_read(phy_id=%i, reg=%x) == %x\n", 751 phy_id, reg, rc); 752 753 return rc; 754 } 755 756 /** 757 * xemaclite_mdio_write - Write to a given MII management register 758 * @bus: the mii_bus struct 759 * @phy_id: the phy address 760 * @reg: register number to write to 761 * @val: value to write to the register number specified by reg 762 * 763 * This function waits till the device is ready to accept a new MDIO 764 * request and then writes the val to the MDIO Write Data register. 765 */ 766 static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg, 767 u16 val) 768 { 769 struct net_local *lp = bus->priv; 770 u32 ctrl_reg; 771 772 dev_dbg(&lp->ndev->dev, 773 "xemaclite_mdio_write(phy_id=%i, reg=%x, val=%x)\n", 774 phy_id, reg, val); 775 776 if (xemaclite_mdio_wait(lp)) 777 return -ETIMEDOUT; 778 779 /* Write the PHY address, register number and clear the OP bit in the 780 * MDIO Address register and then write the value into the MDIO Write 781 * Data register. Finally, set the Status bit in the MDIO Control 782 * register to start a MDIO write transaction. 783 */ 784 ctrl_reg = __raw_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET); 785 __raw_writel(~XEL_MDIOADDR_OP_MASK & 786 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg), 787 lp->base_addr + XEL_MDIOADDR_OFFSET); 788 __raw_writel(val, lp->base_addr + XEL_MDIOWR_OFFSET); 789 __raw_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK, 790 lp->base_addr + XEL_MDIOCTRL_OFFSET); 791 792 return 0; 793 } 794 795 /** 796 * xemaclite_mdio_setup - Register mii_bus for the Emaclite device 797 * @lp: Pointer to the Emaclite device private data 798 * @ofdev: Pointer to OF device structure 799 * 800 * This function enables MDIO bus in the Emaclite device and registers a 801 * mii_bus. 802 * 803 * Return: 0 upon success or a negative error upon failure 804 */ 805 static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev) 806 { 807 struct mii_bus *bus; 808 int rc; 809 struct resource res; 810 struct device_node *np = of_get_parent(lp->phy_node); 811 struct device_node *npp; 812 813 /* Don't register the MDIO bus if the phy_node or its parent node 814 * can't be found. 815 */ 816 if (!np) { 817 dev_err(dev, "Failed to register mdio bus.\n"); 818 return -ENODEV; 819 } 820 npp = of_get_parent(np); 821 822 of_address_to_resource(npp, 0, &res); 823 if (lp->ndev->mem_start != res.start) { 824 struct phy_device *phydev; 825 phydev = of_phy_find_device(lp->phy_node); 826 if (!phydev) 827 dev_info(dev, 828 "MDIO of the phy is not registered yet\n"); 829 else 830 put_device(&phydev->mdio.dev); 831 return 0; 832 } 833 834 /* Enable the MDIO bus by asserting the enable bit in MDIO Control 835 * register. 836 */ 837 __raw_writel(XEL_MDIOCTRL_MDIOEN_MASK, 838 lp->base_addr + XEL_MDIOCTRL_OFFSET); 839 840 bus = mdiobus_alloc(); 841 if (!bus) { 842 dev_err(dev, "Failed to allocate mdiobus\n"); 843 return -ENOMEM; 844 } 845 846 snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx", 847 (unsigned long long)res.start); 848 bus->priv = lp; 849 bus->name = "Xilinx Emaclite MDIO"; 850 bus->read = xemaclite_mdio_read; 851 bus->write = xemaclite_mdio_write; 852 bus->parent = dev; 853 854 lp->mii_bus = bus; 855 856 rc = of_mdiobus_register(bus, np); 857 if (rc) { 858 dev_err(dev, "Failed to register mdio bus.\n"); 859 goto err_register; 860 } 861 862 return 0; 863 864 err_register: 865 mdiobus_free(bus); 866 return rc; 867 } 868 869 /** 870 * xemaclite_adjust_link - Link state callback for the Emaclite device 871 * @ndev: pointer to net_device struct 872 * 873 * There's nothing in the Emaclite device to be configured when the link 874 * state changes. We just print the status. 875 */ 876 static void xemaclite_adjust_link(struct net_device *ndev) 877 { 878 struct net_local *lp = netdev_priv(ndev); 879 struct phy_device *phy = lp->phy_dev; 880 int link_state; 881 882 /* hash together the state values to decide if something has changed */ 883 link_state = phy->speed | (phy->duplex << 1) | phy->link; 884 885 if (lp->last_link != link_state) { 886 lp->last_link = link_state; 887 phy_print_status(phy); 888 } 889 } 890 891 /** 892 * xemaclite_open - Open the network device 893 * @dev: Pointer to the network device 894 * 895 * This function sets the MAC address, requests an IRQ and enables interrupts 896 * for the Emaclite device and starts the Tx queue. 897 * It also connects to the phy device, if MDIO is included in Emaclite device. 898 */ 899 static int xemaclite_open(struct net_device *dev) 900 { 901 struct net_local *lp = netdev_priv(dev); 902 int retval; 903 904 /* Just to be safe, stop the device first */ 905 xemaclite_disable_interrupts(lp); 906 907 if (lp->phy_node) { 908 u32 bmcr; 909 910 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node, 911 xemaclite_adjust_link, 0, 912 PHY_INTERFACE_MODE_MII); 913 if (!lp->phy_dev) { 914 dev_err(&lp->ndev->dev, "of_phy_connect() failed\n"); 915 return -ENODEV; 916 } 917 918 /* EmacLite doesn't support giga-bit speeds */ 919 lp->phy_dev->supported &= (PHY_BASIC_FEATURES); 920 lp->phy_dev->advertising = lp->phy_dev->supported; 921 922 /* Don't advertise 1000BASE-T Full/Half duplex speeds */ 923 phy_write(lp->phy_dev, MII_CTRL1000, 0); 924 925 /* Advertise only 10 and 100mbps full/half duplex speeds */ 926 phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL | 927 ADVERTISE_CSMA); 928 929 /* Restart auto negotiation */ 930 bmcr = phy_read(lp->phy_dev, MII_BMCR); 931 bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART); 932 phy_write(lp->phy_dev, MII_BMCR, bmcr); 933 934 phy_start(lp->phy_dev); 935 } 936 937 /* Set the MAC address each time opened */ 938 xemaclite_update_address(lp, dev->dev_addr); 939 940 /* Grab the IRQ */ 941 retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev); 942 if (retval) { 943 dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n", 944 dev->irq); 945 if (lp->phy_dev) 946 phy_disconnect(lp->phy_dev); 947 lp->phy_dev = NULL; 948 949 return retval; 950 } 951 952 /* Enable Interrupts */ 953 xemaclite_enable_interrupts(lp); 954 955 /* We're ready to go */ 956 netif_start_queue(dev); 957 958 return 0; 959 } 960 961 /** 962 * xemaclite_close - Close the network device 963 * @dev: Pointer to the network device 964 * 965 * This function stops the Tx queue, disables interrupts and frees the IRQ for 966 * the Emaclite device. 967 * It also disconnects the phy device associated with the Emaclite device. 968 */ 969 static int xemaclite_close(struct net_device *dev) 970 { 971 struct net_local *lp = netdev_priv(dev); 972 973 netif_stop_queue(dev); 974 xemaclite_disable_interrupts(lp); 975 free_irq(dev->irq, dev); 976 977 if (lp->phy_dev) 978 phy_disconnect(lp->phy_dev); 979 lp->phy_dev = NULL; 980 981 return 0; 982 } 983 984 /** 985 * xemaclite_send - Transmit a frame 986 * @orig_skb: Pointer to the socket buffer to be transmitted 987 * @dev: Pointer to the network device 988 * 989 * This function checks if the Tx buffer of the Emaclite device is free to send 990 * data. If so, it fills the Tx buffer with data from socket buffer data, 991 * updates the stats and frees the socket buffer. The Tx completion is signaled 992 * by an interrupt. If the Tx buffer isn't free, then the socket buffer is 993 * deferred and the Tx queue is stopped so that the deferred socket buffer can 994 * be transmitted when the Emaclite device is free to transmit data. 995 * 996 * Return: 0, always. 997 */ 998 static int xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev) 999 { 1000 struct net_local *lp = netdev_priv(dev); 1001 struct sk_buff *new_skb; 1002 unsigned int len; 1003 unsigned long flags; 1004 1005 len = orig_skb->len; 1006 1007 new_skb = orig_skb; 1008 1009 spin_lock_irqsave(&lp->reset_lock, flags); 1010 if (xemaclite_send_data(lp, (u8 *) new_skb->data, len) != 0) { 1011 /* If the Emaclite Tx buffer is busy, stop the Tx queue and 1012 * defer the skb for transmission during the ISR, after the 1013 * current transmission is complete */ 1014 netif_stop_queue(dev); 1015 lp->deferred_skb = new_skb; 1016 /* Take the time stamp now, since we can't do this in an ISR. */ 1017 skb_tx_timestamp(new_skb); 1018 spin_unlock_irqrestore(&lp->reset_lock, flags); 1019 return 0; 1020 } 1021 spin_unlock_irqrestore(&lp->reset_lock, flags); 1022 1023 skb_tx_timestamp(new_skb); 1024 1025 dev->stats.tx_bytes += len; 1026 dev_consume_skb_any(new_skb); 1027 1028 return 0; 1029 } 1030 1031 /** 1032 * xemaclite_remove_ndev - Free the network device 1033 * @ndev: Pointer to the network device to be freed 1034 * 1035 * This function un maps the IO region of the Emaclite device and frees the net 1036 * device. 1037 */ 1038 static void xemaclite_remove_ndev(struct net_device *ndev) 1039 { 1040 if (ndev) { 1041 free_netdev(ndev); 1042 } 1043 } 1044 1045 /** 1046 * get_bool - Get a parameter from the OF device 1047 * @ofdev: Pointer to OF device structure 1048 * @s: Property to be retrieved 1049 * 1050 * This function looks for a property in the device node and returns the value 1051 * of the property if its found or 0 if the property is not found. 1052 * 1053 * Return: Value of the parameter if the parameter is found, or 0 otherwise 1054 */ 1055 static bool get_bool(struct platform_device *ofdev, const char *s) 1056 { 1057 u32 *p = (u32 *)of_get_property(ofdev->dev.of_node, s, NULL); 1058 1059 if (p) { 1060 return (bool)*p; 1061 } else { 1062 dev_warn(&ofdev->dev, "Parameter %s not found," 1063 "defaulting to false\n", s); 1064 return false; 1065 } 1066 } 1067 1068 static struct net_device_ops xemaclite_netdev_ops; 1069 1070 /** 1071 * xemaclite_of_probe - Probe method for the Emaclite device. 1072 * @ofdev: Pointer to OF device structure 1073 * @match: Pointer to the structure used for matching a device 1074 * 1075 * This function probes for the Emaclite device in the device tree. 1076 * It initializes the driver data structure and the hardware, sets the MAC 1077 * address and registers the network device. 1078 * It also registers a mii_bus for the Emaclite device, if MDIO is included 1079 * in the device. 1080 * 1081 * Return: 0, if the driver is bound to the Emaclite device, or 1082 * a negative error if there is failure. 1083 */ 1084 static int xemaclite_of_probe(struct platform_device *ofdev) 1085 { 1086 struct resource *res; 1087 struct net_device *ndev = NULL; 1088 struct net_local *lp = NULL; 1089 struct device *dev = &ofdev->dev; 1090 const void *mac_address; 1091 1092 int rc = 0; 1093 1094 dev_info(dev, "Device Tree Probing\n"); 1095 1096 /* Create an ethernet device instance */ 1097 ndev = alloc_etherdev(sizeof(struct net_local)); 1098 if (!ndev) 1099 return -ENOMEM; 1100 1101 dev_set_drvdata(dev, ndev); 1102 SET_NETDEV_DEV(ndev, &ofdev->dev); 1103 1104 lp = netdev_priv(ndev); 1105 lp->ndev = ndev; 1106 1107 /* Get IRQ for the device */ 1108 res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0); 1109 if (!res) { 1110 dev_err(dev, "no IRQ found\n"); 1111 rc = -ENXIO; 1112 goto error; 1113 } 1114 1115 ndev->irq = res->start; 1116 1117 res = platform_get_resource(ofdev, IORESOURCE_MEM, 0); 1118 lp->base_addr = devm_ioremap_resource(&ofdev->dev, res); 1119 if (IS_ERR(lp->base_addr)) { 1120 rc = PTR_ERR(lp->base_addr); 1121 goto error; 1122 } 1123 1124 ndev->mem_start = res->start; 1125 ndev->mem_end = res->end; 1126 1127 spin_lock_init(&lp->reset_lock); 1128 lp->next_tx_buf_to_use = 0x0; 1129 lp->next_rx_buf_to_use = 0x0; 1130 lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong"); 1131 lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong"); 1132 mac_address = of_get_mac_address(ofdev->dev.of_node); 1133 1134 if (mac_address) 1135 /* Set the MAC address. */ 1136 memcpy(ndev->dev_addr, mac_address, ETH_ALEN); 1137 else 1138 dev_warn(dev, "No MAC address found\n"); 1139 1140 /* Clear the Tx CSR's in case this is a restart */ 1141 __raw_writel(0, lp->base_addr + XEL_TSR_OFFSET); 1142 __raw_writel(0, lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET); 1143 1144 /* Set the MAC address in the EmacLite device */ 1145 xemaclite_update_address(lp, ndev->dev_addr); 1146 1147 lp->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0); 1148 rc = xemaclite_mdio_setup(lp, &ofdev->dev); 1149 if (rc) 1150 dev_warn(&ofdev->dev, "error registering MDIO bus\n"); 1151 1152 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); 1153 1154 ndev->netdev_ops = &xemaclite_netdev_ops; 1155 ndev->flags &= ~IFF_MULTICAST; 1156 ndev->watchdog_timeo = TX_TIMEOUT; 1157 1158 /* Finally, register the device */ 1159 rc = register_netdev(ndev); 1160 if (rc) { 1161 dev_err(dev, 1162 "Cannot register network device, aborting\n"); 1163 goto error; 1164 } 1165 1166 dev_info(dev, 1167 "Xilinx EmacLite at 0x%08X mapped to 0x%08X, irq=%d\n", 1168 (unsigned int __force)ndev->mem_start, 1169 (unsigned int __force)lp->base_addr, ndev->irq); 1170 return 0; 1171 1172 error: 1173 xemaclite_remove_ndev(ndev); 1174 return rc; 1175 } 1176 1177 /** 1178 * xemaclite_of_remove - Unbind the driver from the Emaclite device. 1179 * @of_dev: Pointer to OF device structure 1180 * 1181 * This function is called if a device is physically removed from the system or 1182 * if the driver module is being unloaded. It frees any resources allocated to 1183 * the device. 1184 * 1185 * Return: 0, always. 1186 */ 1187 static int xemaclite_of_remove(struct platform_device *of_dev) 1188 { 1189 struct net_device *ndev = platform_get_drvdata(of_dev); 1190 1191 struct net_local *lp = netdev_priv(ndev); 1192 1193 /* Un-register the mii_bus, if configured */ 1194 if (lp->has_mdio) { 1195 mdiobus_unregister(lp->mii_bus); 1196 mdiobus_free(lp->mii_bus); 1197 lp->mii_bus = NULL; 1198 } 1199 1200 unregister_netdev(ndev); 1201 1202 of_node_put(lp->phy_node); 1203 lp->phy_node = NULL; 1204 1205 xemaclite_remove_ndev(ndev); 1206 1207 return 0; 1208 } 1209 1210 #ifdef CONFIG_NET_POLL_CONTROLLER 1211 static void 1212 xemaclite_poll_controller(struct net_device *ndev) 1213 { 1214 disable_irq(ndev->irq); 1215 xemaclite_interrupt(ndev->irq, ndev); 1216 enable_irq(ndev->irq); 1217 } 1218 #endif 1219 1220 static struct net_device_ops xemaclite_netdev_ops = { 1221 .ndo_open = xemaclite_open, 1222 .ndo_stop = xemaclite_close, 1223 .ndo_start_xmit = xemaclite_send, 1224 .ndo_set_mac_address = xemaclite_set_mac_address, 1225 .ndo_tx_timeout = xemaclite_tx_timeout, 1226 #ifdef CONFIG_NET_POLL_CONTROLLER 1227 .ndo_poll_controller = xemaclite_poll_controller, 1228 #endif 1229 }; 1230 1231 /* Match table for OF platform binding */ 1232 static const struct of_device_id xemaclite_of_match[] = { 1233 { .compatible = "xlnx,opb-ethernetlite-1.01.a", }, 1234 { .compatible = "xlnx,opb-ethernetlite-1.01.b", }, 1235 { .compatible = "xlnx,xps-ethernetlite-1.00.a", }, 1236 { .compatible = "xlnx,xps-ethernetlite-2.00.a", }, 1237 { .compatible = "xlnx,xps-ethernetlite-2.01.a", }, 1238 { .compatible = "xlnx,xps-ethernetlite-3.00.a", }, 1239 { /* end of list */ }, 1240 }; 1241 MODULE_DEVICE_TABLE(of, xemaclite_of_match); 1242 1243 static struct platform_driver xemaclite_of_driver = { 1244 .driver = { 1245 .name = DRIVER_NAME, 1246 .of_match_table = xemaclite_of_match, 1247 }, 1248 .probe = xemaclite_of_probe, 1249 .remove = xemaclite_of_remove, 1250 }; 1251 1252 module_platform_driver(xemaclite_of_driver); 1253 1254 MODULE_AUTHOR("Xilinx, Inc."); 1255 MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver"); 1256 MODULE_LICENSE("GPL"); 1257