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@petalogix.com>. 6 * 7 * 2007-2009 (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/init.h> 18#include <linux/netdevice.h> 19#include <linux/etherdevice.h> 20#include <linux/skbuff.h> 21#include <linux/io.h> 22#include <linux/slab.h> 23#include <linux/of_address.h> 24#include <linux/of_device.h> 25#include <linux/of_platform.h> 26#include <linux/of_mdio.h> 27#include <linux/phy.h> 28 29#define DRIVER_NAME "xilinx_emaclite" 30 31/* Register offsets for the EmacLite Core */ 32#define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */ 33#define XEL_MDIOADDR_OFFSET 0x07E4 /* MDIO Address Register */ 34#define XEL_MDIOWR_OFFSET 0x07E8 /* MDIO Write Data Register */ 35#define XEL_MDIORD_OFFSET 0x07EC /* MDIO Read Data Register */ 36#define XEL_MDIOCTRL_OFFSET 0x07F0 /* MDIO Control Register */ 37#define XEL_GIER_OFFSET 0x07F8 /* GIE Register */ 38#define XEL_TSR_OFFSET 0x07FC /* Tx status */ 39#define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */ 40 41#define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */ 42#define XEL_RPLR_OFFSET 0x100C /* Rx packet length */ 43#define XEL_RSR_OFFSET 0x17FC /* Rx status */ 44 45#define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */ 46 47/* MDIO Address Register Bit Masks */ 48#define XEL_MDIOADDR_REGADR_MASK 0x0000001F /* Register Address */ 49#define XEL_MDIOADDR_PHYADR_MASK 0x000003E0 /* PHY Address */ 50#define XEL_MDIOADDR_PHYADR_SHIFT 5 51#define XEL_MDIOADDR_OP_MASK 0x00000400 /* RD/WR Operation */ 52 53/* MDIO Write Data Register Bit Masks */ 54#define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */ 55 56/* MDIO Read Data Register Bit Masks */ 57#define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */ 58 59/* MDIO Control Register Bit Masks */ 60#define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001 /* MDIO Status Mask */ 61#define XEL_MDIOCTRL_MDIOEN_MASK 0x00000008 /* MDIO Enable */ 62 63/* Global Interrupt Enable Register (GIER) Bit Masks */ 64#define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */ 65 66/* Transmit Status Register (TSR) Bit Masks */ 67#define XEL_TSR_XMIT_BUSY_MASK 0x00000001 /* Tx complete */ 68#define XEL_TSR_PROGRAM_MASK 0x00000002 /* Program the MAC address */ 69#define XEL_TSR_XMIT_IE_MASK 0x00000008 /* Tx interrupt enable bit */ 70#define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000 /* Buffer is active, SW bit 71 * only. This is not documented 72 * in the HW spec */ 73 74/* Define for programming the MAC address into the EmacLite */ 75#define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK) 76 77/* Receive Status Register (RSR) */ 78#define XEL_RSR_RECV_DONE_MASK 0x00000001 /* Rx complete */ 79#define XEL_RSR_RECV_IE_MASK 0x00000008 /* Rx interrupt enable bit */ 80 81/* Transmit Packet Length Register (TPLR) */ 82#define XEL_TPLR_LENGTH_MASK 0x0000FFFF /* Tx packet length */ 83 84/* Receive Packet Length Register (RPLR) */ 85#define XEL_RPLR_LENGTH_MASK 0x0000FFFF /* Rx packet length */ 86 87#define XEL_HEADER_OFFSET 12 /* Offset to length field */ 88#define XEL_HEADER_SHIFT 16 /* Shift value for length */ 89 90/* General Ethernet Definitions */ 91#define XEL_ARP_PACKET_SIZE 28 /* Max ARP packet size */ 92#define XEL_HEADER_IP_LENGTH_OFFSET 16 /* IP Length Offset */ 93 94 95 96#define TX_TIMEOUT (60*HZ) /* Tx timeout is 60 seconds. */ 97#define ALIGNMENT 4 98 99/* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */ 100#define BUFFER_ALIGN(adr) ((ALIGNMENT - ((u32) adr)) % ALIGNMENT) 101 102/** 103 * struct net_local - Our private per device data 104 * @ndev: instance of the network device 105 * @tx_ping_pong: indicates whether Tx Pong buffer is configured in HW 106 * @rx_ping_pong: indicates whether Rx Pong buffer is configured in HW 107 * @next_tx_buf_to_use: next Tx buffer to write to 108 * @next_rx_buf_to_use: next Rx buffer to read from 109 * @base_addr: base address of the Emaclite device 110 * @reset_lock: lock used for synchronization 111 * @deferred_skb: holds an skb (for transmission at a later time) when the 112 * Tx buffer is not free 113 * @phy_dev: pointer to the PHY device 114 * @phy_node: pointer to the PHY device node 115 * @mii_bus: pointer to the MII bus 116 * @mdio_irqs: IRQs table for MDIO bus 117 * @last_link: last link status 118 * @has_mdio: indicates whether MDIO is included in the HW 119 */ 120struct 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 int mdio_irqs[PHY_MAX_ADDR]; 138 139 int last_link; 140 bool has_mdio; 141}; 142 143 144/*************************/ 145/* EmacLite driver calls */ 146/*************************/ 147 148/** 149 * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device 150 * @drvdata: Pointer to the Emaclite device private data 151 * 152 * This function enables the Tx and Rx interrupts for the Emaclite device along 153 * with the Global Interrupt Enable. 154 */ 155static void xemaclite_enable_interrupts(struct net_local *drvdata) 156{ 157 u32 reg_data; 158 159 /* Enable the Tx interrupts for the first Buffer */ 160 reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET); 161 out_be32(drvdata->base_addr + XEL_TSR_OFFSET, 162 reg_data | XEL_TSR_XMIT_IE_MASK); 163 164 /* Enable the Tx interrupts for the second Buffer if 165 * configured in HW */ 166 if (drvdata->tx_ping_pong != 0) { 167 reg_data = in_be32(drvdata->base_addr + 168 XEL_BUFFER_OFFSET + XEL_TSR_OFFSET); 169 out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + 170 XEL_TSR_OFFSET, 171 reg_data | XEL_TSR_XMIT_IE_MASK); 172 } 173 174 /* Enable the Rx interrupts for the first buffer */ 175 out_be32(drvdata->base_addr + XEL_RSR_OFFSET, 176 XEL_RSR_RECV_IE_MASK); 177 178 /* Enable the Rx interrupts for the second Buffer if 179 * configured in HW */ 180 if (drvdata->rx_ping_pong != 0) { 181 out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + 182 XEL_RSR_OFFSET, 183 XEL_RSR_RECV_IE_MASK); 184 } 185 186 /* Enable the Global Interrupt Enable */ 187 out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK); 188} 189 190/** 191 * xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device 192 * @drvdata: Pointer to the Emaclite device private data 193 * 194 * This function disables the Tx and Rx interrupts for the Emaclite device, 195 * along with the Global Interrupt Enable. 196 */ 197static void xemaclite_disable_interrupts(struct net_local *drvdata) 198{ 199 u32 reg_data; 200 201 /* Disable the Global Interrupt Enable */ 202 out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK); 203 204 /* Disable the Tx interrupts for the first buffer */ 205 reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET); 206 out_be32(drvdata->base_addr + XEL_TSR_OFFSET, 207 reg_data & (~XEL_TSR_XMIT_IE_MASK)); 208 209 /* Disable the Tx interrupts for the second Buffer 210 * if configured in HW */ 211 if (drvdata->tx_ping_pong != 0) { 212 reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + 213 XEL_TSR_OFFSET); 214 out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + 215 XEL_TSR_OFFSET, 216 reg_data & (~XEL_TSR_XMIT_IE_MASK)); 217 } 218 219 /* Disable the Rx interrupts for the first buffer */ 220 reg_data = in_be32(drvdata->base_addr + XEL_RSR_OFFSET); 221 out_be32(drvdata->base_addr + XEL_RSR_OFFSET, 222 reg_data & (~XEL_RSR_RECV_IE_MASK)); 223 224 /* Disable the Rx interrupts for the second buffer 225 * if configured in HW */ 226 if (drvdata->rx_ping_pong != 0) { 227 228 reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + 229 XEL_RSR_OFFSET); 230 out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + 231 XEL_RSR_OFFSET, 232 reg_data & (~XEL_RSR_RECV_IE_MASK)); 233 } 234} 235 236/** 237 * xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address 238 * @src_ptr: Void pointer to the 16-bit aligned source address 239 * @dest_ptr: Pointer to the 32-bit aligned destination address 240 * @length: Number bytes to write from source to destination 241 * 242 * This function writes data from a 16-bit aligned buffer to a 32-bit aligned 243 * address in the EmacLite device. 244 */ 245static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr, 246 unsigned length) 247{ 248 u32 align_buffer; 249 u32 *to_u32_ptr; 250 u16 *from_u16_ptr, *to_u16_ptr; 251 252 to_u32_ptr = dest_ptr; 253 from_u16_ptr = (u16 *) src_ptr; 254 align_buffer = 0; 255 256 for (; length > 3; length -= 4) { 257 to_u16_ptr = (u16 *) ((void *) &align_buffer); 258 *to_u16_ptr++ = *from_u16_ptr++; 259 *to_u16_ptr++ = *from_u16_ptr++; 260 261 /* Output a word */ 262 *to_u32_ptr++ = align_buffer; 263 } 264 if (length) { 265 u8 *from_u8_ptr, *to_u8_ptr; 266 267 /* Set up to output the remaining data */ 268 align_buffer = 0; 269 to_u8_ptr = (u8 *) &align_buffer; 270 from_u8_ptr = (u8 *) from_u16_ptr; 271 272 /* Output the remaining data */ 273 for (; length > 0; length--) 274 *to_u8_ptr++ = *from_u8_ptr++; 275 276 *to_u32_ptr = align_buffer; 277 } 278} 279 280/** 281 * xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer 282 * @src_ptr: Pointer to the 32-bit aligned source address 283 * @dest_ptr: Pointer to the 16-bit aligned destination address 284 * @length: Number bytes to read from source to destination 285 * 286 * This function reads data from a 32-bit aligned address in the EmacLite device 287 * to a 16-bit aligned buffer. 288 */ 289static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr, 290 unsigned length) 291{ 292 u16 *to_u16_ptr, *from_u16_ptr; 293 u32 *from_u32_ptr; 294 u32 align_buffer; 295 296 from_u32_ptr = src_ptr; 297 to_u16_ptr = (u16 *) dest_ptr; 298 299 for (; length > 3; length -= 4) { 300 /* Copy each word into the temporary buffer */ 301 align_buffer = *from_u32_ptr++; 302 from_u16_ptr = (u16 *)&align_buffer; 303 304 /* Read data from source */ 305 *to_u16_ptr++ = *from_u16_ptr++; 306 *to_u16_ptr++ = *from_u16_ptr++; 307 } 308 309 if (length) { 310 u8 *to_u8_ptr, *from_u8_ptr; 311 312 /* Set up to read the remaining data */ 313 to_u8_ptr = (u8 *) to_u16_ptr; 314 align_buffer = *from_u32_ptr++; 315 from_u8_ptr = (u8 *) &align_buffer; 316 317 /* Read the remaining data */ 318 for (; length > 0; length--) 319 *to_u8_ptr = *from_u8_ptr; 320 } 321} 322 323/** 324 * xemaclite_send_data - Send an Ethernet frame 325 * @drvdata: Pointer to the Emaclite device private data 326 * @data: Pointer to the data to be sent 327 * @byte_count: Total frame size, including header 328 * 329 * This function checks if the Tx buffer of the Emaclite device is free to send 330 * data. If so, it fills the Tx buffer with data for transmission. Otherwise, it 331 * returns an error. 332 * 333 * Return: 0 upon success or -1 if the buffer(s) are full. 334 * 335 * Note: The maximum Tx packet size can not be more than Ethernet header 336 * (14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS. 337 */ 338static int xemaclite_send_data(struct net_local *drvdata, u8 *data, 339 unsigned int byte_count) 340{ 341 u32 reg_data; 342 void __iomem *addr; 343 344 /* Determine the expected Tx buffer address */ 345 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use; 346 347 /* If the length is too large, truncate it */ 348 if (byte_count > ETH_FRAME_LEN) 349 byte_count = ETH_FRAME_LEN; 350 351 /* Check if the expected buffer is available */ 352 reg_data = in_be32(addr + XEL_TSR_OFFSET); 353 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK | 354 XEL_TSR_XMIT_ACTIVE_MASK)) == 0) { 355 356 /* Switch to next buffer if configured */ 357 if (drvdata->tx_ping_pong != 0) 358 drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET; 359 } else if (drvdata->tx_ping_pong != 0) { 360 /* If the expected buffer is full, try the other buffer, 361 * if it is configured in HW */ 362 363 addr = (void __iomem __force *)((u32 __force)addr ^ 364 XEL_BUFFER_OFFSET); 365 reg_data = in_be32(addr + XEL_TSR_OFFSET); 366 367 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK | 368 XEL_TSR_XMIT_ACTIVE_MASK)) != 0) 369 return -1; /* Buffers were full, return failure */ 370 } else 371 return -1; /* Buffer was full, return failure */ 372 373 /* Write the frame to the buffer */ 374 xemaclite_aligned_write(data, (u32 __force *) addr, byte_count); 375 376 out_be32(addr + XEL_TPLR_OFFSET, (byte_count & XEL_TPLR_LENGTH_MASK)); 377 378 /* Update the Tx Status Register to indicate that there is a 379 * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which 380 * is used by the interrupt handler to check whether a frame 381 * has been transmitted */ 382 reg_data = in_be32(addr + XEL_TSR_OFFSET); 383 reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK); 384 out_be32(addr + XEL_TSR_OFFSET, reg_data); 385 386 return 0; 387} 388 389/** 390 * xemaclite_recv_data - Receive a frame 391 * @drvdata: Pointer to the Emaclite device private data 392 * @data: Address where the data is to be received 393 * 394 * This function is intended to be called from the interrupt context or 395 * with a wrapper which waits for the receive frame to be available. 396 * 397 * Return: Total number of bytes received 398 */ 399static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data) 400{ 401 void __iomem *addr; 402 u16 length, proto_type; 403 u32 reg_data; 404 405 /* Determine the expected buffer address */ 406 addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use); 407 408 /* Verify which buffer has valid data */ 409 reg_data = in_be32(addr + XEL_RSR_OFFSET); 410 411 if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) { 412 if (drvdata->rx_ping_pong != 0) 413 drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET; 414 } else { 415 /* The instance is out of sync, try other buffer if other 416 * buffer is configured, return 0 otherwise. If the instance is 417 * out of sync, do not update the 'next_rx_buf_to_use' since it 418 * will correct on subsequent calls */ 419 if (drvdata->rx_ping_pong != 0) 420 addr = (void __iomem __force *)((u32 __force)addr ^ 421 XEL_BUFFER_OFFSET); 422 else 423 return 0; /* No data was available */ 424 425 /* Verify that buffer has valid data */ 426 reg_data = in_be32(addr + XEL_RSR_OFFSET); 427 if ((reg_data & XEL_RSR_RECV_DONE_MASK) != 428 XEL_RSR_RECV_DONE_MASK) 429 return 0; /* No data was available */ 430 } 431 432 /* Get the protocol type of the ethernet frame that arrived */ 433 proto_type = ((in_be32(addr + XEL_HEADER_OFFSET + 434 XEL_RXBUFF_OFFSET) >> XEL_HEADER_SHIFT) & 435 XEL_RPLR_LENGTH_MASK); 436 437 /* Check if received ethernet frame is a raw ethernet frame 438 * or an IP packet or an ARP packet */ 439 if (proto_type > (ETH_FRAME_LEN + ETH_FCS_LEN)) { 440 441 if (proto_type == ETH_P_IP) { 442 length = ((in_be32(addr + 443 XEL_HEADER_IP_LENGTH_OFFSET + 444 XEL_RXBUFF_OFFSET) >> 445 XEL_HEADER_SHIFT) & 446 XEL_RPLR_LENGTH_MASK); 447 length += ETH_HLEN + ETH_FCS_LEN; 448 449 } else if (proto_type == ETH_P_ARP) 450 length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN; 451 else 452 /* Field contains type other than IP or ARP, use max 453 * frame size and let user parse it */ 454 length = ETH_FRAME_LEN + ETH_FCS_LEN; 455 } else 456 /* Use the length in the frame, plus the header and trailer */ 457 length = proto_type + ETH_HLEN + ETH_FCS_LEN; 458 459 /* Read from the EmacLite device */ 460 xemaclite_aligned_read((u32 __force *) (addr + XEL_RXBUFF_OFFSET), 461 data, length); 462 463 /* Acknowledge the frame */ 464 reg_data = in_be32(addr + XEL_RSR_OFFSET); 465 reg_data &= ~XEL_RSR_RECV_DONE_MASK; 466 out_be32(addr + XEL_RSR_OFFSET, reg_data); 467 468 return length; 469} 470 471/** 472 * xemaclite_update_address - Update the MAC address in the device 473 * @drvdata: Pointer to the Emaclite device private data 474 * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value) 475 * 476 * Tx must be idle and Rx should be idle for deterministic results. 477 * It is recommended that this function should be called after the 478 * initialization and before transmission of any packets from the device. 479 * The MAC address can be programmed using any of the two transmit 480 * buffers (if configured). 481 */ 482static void xemaclite_update_address(struct net_local *drvdata, 483 u8 *address_ptr) 484{ 485 void __iomem *addr; 486 u32 reg_data; 487 488 /* Determine the expected Tx buffer address */ 489 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use; 490 491 xemaclite_aligned_write(address_ptr, (u32 __force *) addr, ETH_ALEN); 492 493 out_be32(addr + XEL_TPLR_OFFSET, ETH_ALEN); 494 495 /* Update the MAC address in the EmacLite */ 496 reg_data = in_be32(addr + XEL_TSR_OFFSET); 497 out_be32(addr + XEL_TSR_OFFSET, reg_data | XEL_TSR_PROG_MAC_ADDR); 498 499 /* Wait for EmacLite to finish with the MAC address update */ 500 while ((in_be32(addr + XEL_TSR_OFFSET) & 501 XEL_TSR_PROG_MAC_ADDR) != 0) 502 ; 503} 504 505/** 506 * xemaclite_set_mac_address - Set the MAC address for this device 507 * @dev: Pointer to the network device instance 508 * @addr: Void pointer to the sockaddr structure 509 * 510 * This function copies the HW address from the sockaddr strucutre to the 511 * net_device structure and updates the address in HW. 512 * 513 * Return: Error if the net device is busy or 0 if the addr is set 514 * successfully 515 */ 516static int xemaclite_set_mac_address(struct net_device *dev, void *address) 517{ 518 struct net_local *lp = (struct net_local *) netdev_priv(dev); 519 struct sockaddr *addr = address; 520 521 if (netif_running(dev)) 522 return -EBUSY; 523 524 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); 525 xemaclite_update_address(lp, dev->dev_addr); 526 return 0; 527} 528 529/** 530 * xemaclite_tx_timeout - Callback for Tx Timeout 531 * @dev: Pointer to the network device 532 * 533 * This function is called when Tx time out occurs for Emaclite device. 534 */ 535static void xemaclite_tx_timeout(struct net_device *dev) 536{ 537 struct net_local *lp = (struct net_local *) netdev_priv(dev); 538 unsigned long flags; 539 540 dev_err(&lp->ndev->dev, "Exceeded transmit timeout of %lu ms\n", 541 TX_TIMEOUT * 1000UL / HZ); 542 543 dev->stats.tx_errors++; 544 545 /* Reset the device */ 546 spin_lock_irqsave(&lp->reset_lock, flags); 547 548 /* Shouldn't really be necessary, but shouldn't hurt */ 549 netif_stop_queue(dev); 550 551 xemaclite_disable_interrupts(lp); 552 xemaclite_enable_interrupts(lp); 553 554 if (lp->deferred_skb) { 555 dev_kfree_skb(lp->deferred_skb); 556 lp->deferred_skb = NULL; 557 dev->stats.tx_errors++; 558 } 559 560 /* To exclude tx timeout */ 561 dev->trans_start = jiffies; /* prevent tx timeout */ 562 563 /* We're all ready to go. Start the queue */ 564 netif_wake_queue(dev); 565 spin_unlock_irqrestore(&lp->reset_lock, flags); 566} 567 568/**********************/ 569/* Interrupt Handlers */ 570/**********************/ 571 572/** 573 * xemaclite_tx_handler - Interrupt handler for frames sent 574 * @dev: Pointer to the network device 575 * 576 * This function updates the number of packets transmitted and handles the 577 * deferred skb, if there is one. 578 */ 579static void xemaclite_tx_handler(struct net_device *dev) 580{ 581 struct net_local *lp = (struct net_local *) netdev_priv(dev); 582 583 dev->stats.tx_packets++; 584 if (lp->deferred_skb) { 585 if (xemaclite_send_data(lp, 586 (u8 *) lp->deferred_skb->data, 587 lp->deferred_skb->len) != 0) 588 return; 589 else { 590 dev->stats.tx_bytes += lp->deferred_skb->len; 591 dev_kfree_skb_irq(lp->deferred_skb); 592 lp->deferred_skb = NULL; 593 dev->trans_start = jiffies; /* prevent tx timeout */ 594 netif_wake_queue(dev); 595 } 596 } 597} 598 599/** 600 * xemaclite_rx_handler- Interrupt handler for frames received 601 * @dev: Pointer to the network device 602 * 603 * This function allocates memory for a socket buffer, fills it with data 604 * received and hands it over to the TCP/IP stack. 605 */ 606static void xemaclite_rx_handler(struct net_device *dev) 607{ 608 struct net_local *lp = (struct net_local *) netdev_priv(dev); 609 struct sk_buff *skb; 610 unsigned int align; 611 u32 len; 612 613 len = ETH_FRAME_LEN + ETH_FCS_LEN; 614 skb = dev_alloc_skb(len + ALIGNMENT); 615 if (!skb) { 616 /* Couldn't get memory. */ 617 dev->stats.rx_dropped++; 618 dev_err(&lp->ndev->dev, "Could not allocate receive buffer\n"); 619 return; 620 } 621 622 /* 623 * A new skb should have the data halfword aligned, but this code is 624 * here just in case that isn't true. Calculate how many 625 * bytes we should reserve to get the data to start on a word 626 * boundary */ 627 align = BUFFER_ALIGN(skb->data); 628 if (align) 629 skb_reserve(skb, align); 630 631 skb_reserve(skb, 2); 632 633 len = xemaclite_recv_data(lp, (u8 *) skb->data); 634 635 if (!len) { 636 dev->stats.rx_errors++; 637 dev_kfree_skb_irq(skb); 638 return; 639 } 640 641 skb_put(skb, len); /* Tell the skb how much data we got */ 642 643 skb->protocol = eth_type_trans(skb, dev); 644 skb->ip_summed = CHECKSUM_NONE; 645 646 dev->stats.rx_packets++; 647 dev->stats.rx_bytes += len; 648 649 netif_rx(skb); /* Send the packet upstream */ 650} 651 652/** 653 * xemaclite_interrupt - Interrupt handler for this driver 654 * @irq: Irq of the Emaclite device 655 * @dev_id: Void pointer to the network device instance used as callback 656 * reference 657 * 658 * This function handles the Tx and Rx interrupts of the EmacLite device. 659 */ 660static irqreturn_t xemaclite_interrupt(int irq, void *dev_id) 661{ 662 bool tx_complete = 0; 663 struct net_device *dev = dev_id; 664 struct net_local *lp = (struct net_local *) netdev_priv(dev); 665 void __iomem *base_addr = lp->base_addr; 666 u32 tx_status; 667 668 /* Check if there is Rx Data available */ 669 if ((in_be32(base_addr + XEL_RSR_OFFSET) & XEL_RSR_RECV_DONE_MASK) || 670 (in_be32(base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET) 671 & XEL_RSR_RECV_DONE_MASK)) 672 673 xemaclite_rx_handler(dev); 674 675 /* Check if the Transmission for the first buffer is completed */ 676 tx_status = in_be32(base_addr + XEL_TSR_OFFSET); 677 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) && 678 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) { 679 680 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK; 681 out_be32(base_addr + XEL_TSR_OFFSET, tx_status); 682 683 tx_complete = 1; 684 } 685 686 /* Check if the Transmission for the second buffer is completed */ 687 tx_status = in_be32(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET); 688 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) && 689 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) { 690 691 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK; 692 out_be32(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, 693 tx_status); 694 695 tx_complete = 1; 696 } 697 698 /* If there was a Tx interrupt, call the Tx Handler */ 699 if (tx_complete != 0) 700 xemaclite_tx_handler(dev); 701 702 return IRQ_HANDLED; 703} 704 705/**********************/ 706/* MDIO Bus functions */ 707/**********************/ 708 709/** 710 * xemaclite_mdio_wait - Wait for the MDIO to be ready to use 711 * @lp: Pointer to the Emaclite device private data 712 * 713 * This function waits till the device is ready to accept a new MDIO 714 * request. 715 * 716 * Return: 0 for success or ETIMEDOUT for a timeout 717 */ 718 719static int xemaclite_mdio_wait(struct net_local *lp) 720{ 721 long end = jiffies + 2; 722 723 /* wait for the MDIO interface to not be busy or timeout 724 after some time. 725 */ 726 while (in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET) & 727 XEL_MDIOCTRL_MDIOSTS_MASK) { 728 if (end - jiffies <= 0) { 729 WARN_ON(1); 730 return -ETIMEDOUT; 731 } 732 msleep(1); 733 } 734 return 0; 735} 736 737/** 738 * xemaclite_mdio_read - Read from a given MII management register 739 * @bus: the mii_bus struct 740 * @phy_id: the phy address 741 * @reg: register number to read from 742 * 743 * This function waits till the device is ready to accept a new MDIO 744 * request and then writes the phy address to the MDIO Address register 745 * and reads data from MDIO Read Data register, when its available. 746 * 747 * Return: Value read from the MII management register 748 */ 749static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg) 750{ 751 struct net_local *lp = bus->priv; 752 u32 ctrl_reg; 753 u32 rc; 754 755 if (xemaclite_mdio_wait(lp)) 756 return -ETIMEDOUT; 757 758 /* Write the PHY address, register number and set the OP bit in the 759 * MDIO Address register. Set the Status bit in the MDIO Control 760 * register to start a MDIO read transaction. 761 */ 762 ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET); 763 out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET, 764 XEL_MDIOADDR_OP_MASK | 765 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg)); 766 out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET, 767 ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK); 768 769 if (xemaclite_mdio_wait(lp)) 770 return -ETIMEDOUT; 771 772 rc = in_be32(lp->base_addr + XEL_MDIORD_OFFSET); 773 774 dev_dbg(&lp->ndev->dev, 775 "xemaclite_mdio_read(phy_id=%i, reg=%x) == %x\n", 776 phy_id, reg, rc); 777 778 return rc; 779} 780 781/** 782 * xemaclite_mdio_write - Write to a given MII management register 783 * @bus: the mii_bus struct 784 * @phy_id: the phy address 785 * @reg: register number to write to 786 * @val: value to write to the register number specified by reg 787 * 788 * This fucntion waits till the device is ready to accept a new MDIO 789 * request and then writes the val to the MDIO Write Data register. 790 */ 791static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg, 792 u16 val) 793{ 794 struct net_local *lp = bus->priv; 795 u32 ctrl_reg; 796 797 dev_dbg(&lp->ndev->dev, 798 "xemaclite_mdio_write(phy_id=%i, reg=%x, val=%x)\n", 799 phy_id, reg, val); 800 801 if (xemaclite_mdio_wait(lp)) 802 return -ETIMEDOUT; 803 804 /* Write the PHY address, register number and clear the OP bit in the 805 * MDIO Address register and then write the value into the MDIO Write 806 * Data register. Finally, set the Status bit in the MDIO Control 807 * register to start a MDIO write transaction. 808 */ 809 ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET); 810 out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET, 811 ~XEL_MDIOADDR_OP_MASK & 812 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg)); 813 out_be32(lp->base_addr + XEL_MDIOWR_OFFSET, val); 814 out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET, 815 ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK); 816 817 return 0; 818} 819 820/** 821 * xemaclite_mdio_reset - Reset the mdio bus. 822 * @bus: Pointer to the MII bus 823 * 824 * This function is required(?) as per Documentation/networking/phy.txt. 825 * There is no reset in this device; this function always returns 0. 826 */ 827static int xemaclite_mdio_reset(struct mii_bus *bus) 828{ 829 return 0; 830} 831 832/** 833 * xemaclite_mdio_setup - Register mii_bus for the Emaclite device 834 * @lp: Pointer to the Emaclite device private data 835 * @ofdev: Pointer to OF device structure 836 * 837 * This function enables MDIO bus in the Emaclite device and registers a 838 * mii_bus. 839 * 840 * Return: 0 upon success or a negative error upon failure 841 */ 842static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev) 843{ 844 struct mii_bus *bus; 845 int rc; 846 struct resource res; 847 struct device_node *np = of_get_parent(lp->phy_node); 848 849 /* Don't register the MDIO bus if the phy_node or its parent node 850 * can't be found. 851 */ 852 if (!np) 853 return -ENODEV; 854 855 /* Enable the MDIO bus by asserting the enable bit in MDIO Control 856 * register. 857 */ 858 out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET, 859 XEL_MDIOCTRL_MDIOEN_MASK); 860 861 bus = mdiobus_alloc(); 862 if (!bus) 863 return -ENOMEM; 864 865 of_address_to_resource(np, 0, &res); 866 snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx", 867 (unsigned long long)res.start); 868 bus->priv = lp; 869 bus->name = "Xilinx Emaclite MDIO"; 870 bus->read = xemaclite_mdio_read; 871 bus->write = xemaclite_mdio_write; 872 bus->reset = xemaclite_mdio_reset; 873 bus->parent = dev; 874 bus->irq = lp->mdio_irqs; /* preallocated IRQ table */ 875 876 lp->mii_bus = bus; 877 878 rc = of_mdiobus_register(bus, np); 879 if (rc) 880 goto err_register; 881 882 return 0; 883 884err_register: 885 mdiobus_free(bus); 886 return rc; 887} 888 889/** 890 * xemaclite_adjust_link - Link state callback for the Emaclite device 891 * @ndev: pointer to net_device struct 892 * 893 * There's nothing in the Emaclite device to be configured when the link 894 * state changes. We just print the status. 895 */ 896void xemaclite_adjust_link(struct net_device *ndev) 897{ 898 struct net_local *lp = netdev_priv(ndev); 899 struct phy_device *phy = lp->phy_dev; 900 int link_state; 901 902 /* hash together the state values to decide if something has changed */ 903 link_state = phy->speed | (phy->duplex << 1) | phy->link; 904 905 if (lp->last_link != link_state) { 906 lp->last_link = link_state; 907 phy_print_status(phy); 908 } 909} 910 911/** 912 * xemaclite_open - Open the network device 913 * @dev: Pointer to the network device 914 * 915 * This function sets the MAC address, requests an IRQ and enables interrupts 916 * for the Emaclite device and starts the Tx queue. 917 * It also connects to the phy device, if MDIO is included in Emaclite device. 918 */ 919static int xemaclite_open(struct net_device *dev) 920{ 921 struct net_local *lp = (struct net_local *) netdev_priv(dev); 922 int retval; 923 924 /* Just to be safe, stop the device first */ 925 xemaclite_disable_interrupts(lp); 926 927 if (lp->phy_node) { 928 u32 bmcr; 929 930 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node, 931 xemaclite_adjust_link, 0, 932 PHY_INTERFACE_MODE_MII); 933 if (!lp->phy_dev) { 934 dev_err(&lp->ndev->dev, "of_phy_connect() failed\n"); 935 return -ENODEV; 936 } 937 938 /* EmacLite doesn't support giga-bit speeds */ 939 lp->phy_dev->supported &= (PHY_BASIC_FEATURES); 940 lp->phy_dev->advertising = lp->phy_dev->supported; 941 942 /* Don't advertise 1000BASE-T Full/Half duplex speeds */ 943 phy_write(lp->phy_dev, MII_CTRL1000, 0); 944 945 /* Advertise only 10 and 100mbps full/half duplex speeds */ 946 phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL); 947 948 /* Restart auto negotiation */ 949 bmcr = phy_read(lp->phy_dev, MII_BMCR); 950 bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART); 951 phy_write(lp->phy_dev, MII_BMCR, bmcr); 952 953 phy_start(lp->phy_dev); 954 } 955 956 /* Set the MAC address each time opened */ 957 xemaclite_update_address(lp, dev->dev_addr); 958 959 /* Grab the IRQ */ 960 retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev); 961 if (retval) { 962 dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n", 963 dev->irq); 964 if (lp->phy_dev) 965 phy_disconnect(lp->phy_dev); 966 lp->phy_dev = NULL; 967 968 return retval; 969 } 970 971 /* Enable Interrupts */ 972 xemaclite_enable_interrupts(lp); 973 974 /* We're ready to go */ 975 netif_start_queue(dev); 976 977 return 0; 978} 979 980/** 981 * xemaclite_close - Close the network device 982 * @dev: Pointer to the network device 983 * 984 * This function stops the Tx queue, disables interrupts and frees the IRQ for 985 * the Emaclite device. 986 * It also disconnects the phy device associated with the Emaclite device. 987 */ 988static int xemaclite_close(struct net_device *dev) 989{ 990 struct net_local *lp = (struct net_local *) netdev_priv(dev); 991 992 netif_stop_queue(dev); 993 xemaclite_disable_interrupts(lp); 994 free_irq(dev->irq, dev); 995 996 if (lp->phy_dev) 997 phy_disconnect(lp->phy_dev); 998 lp->phy_dev = NULL; 999 1000 return 0; 1001} 1002 1003/** 1004 * xemaclite_get_stats - Get the stats for the net_device 1005 * @dev: Pointer to the network device 1006 * 1007 * This function returns the address of the 'net_device_stats' structure for the 1008 * given network device. This structure holds usage statistics for the network 1009 * device. 1010 * 1011 * Return: Pointer to the net_device_stats structure. 1012 */ 1013static struct net_device_stats *xemaclite_get_stats(struct net_device *dev) 1014{ 1015 return &dev->stats; 1016} 1017 1018/** 1019 * xemaclite_send - Transmit a frame 1020 * @orig_skb: Pointer to the socket buffer to be transmitted 1021 * @dev: Pointer to the network device 1022 * 1023 * This function checks if the Tx buffer of the Emaclite device is free to send 1024 * data. If so, it fills the Tx buffer with data from socket buffer data, 1025 * updates the stats and frees the socket buffer. The Tx completion is signaled 1026 * by an interrupt. If the Tx buffer isn't free, then the socket buffer is 1027 * deferred and the Tx queue is stopped so that the deferred socket buffer can 1028 * be transmitted when the Emaclite device is free to transmit data. 1029 * 1030 * Return: 0, always. 1031 */ 1032static int xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev) 1033{ 1034 struct net_local *lp = (struct net_local *) netdev_priv(dev); 1035 struct sk_buff *new_skb; 1036 unsigned int len; 1037 unsigned long flags; 1038 1039 len = orig_skb->len; 1040 1041 new_skb = orig_skb; 1042 1043 spin_lock_irqsave(&lp->reset_lock, flags); 1044 if (xemaclite_send_data(lp, (u8 *) new_skb->data, len) != 0) { 1045 /* If the Emaclite Tx buffer is busy, stop the Tx queue and 1046 * defer the skb for transmission at a later point when the 1047 * current transmission is complete */ 1048 netif_stop_queue(dev); 1049 lp->deferred_skb = new_skb; 1050 spin_unlock_irqrestore(&lp->reset_lock, flags); 1051 return 0; 1052 } 1053 spin_unlock_irqrestore(&lp->reset_lock, flags); 1054 1055 dev->stats.tx_bytes += len; 1056 dev_kfree_skb(new_skb); 1057 1058 return 0; 1059} 1060 1061/** 1062 * xemaclite_remove_ndev - Free the network device 1063 * @ndev: Pointer to the network device to be freed 1064 * 1065 * This function un maps the IO region of the Emaclite device and frees the net 1066 * device. 1067 */ 1068static void xemaclite_remove_ndev(struct net_device *ndev) 1069{ 1070 if (ndev) { 1071 struct net_local *lp = (struct net_local *) netdev_priv(ndev); 1072 1073 if (lp->base_addr) 1074 iounmap((void __iomem __force *) (lp->base_addr)); 1075 free_netdev(ndev); 1076 } 1077} 1078 1079/** 1080 * get_bool - Get a parameter from the OF device 1081 * @ofdev: Pointer to OF device structure 1082 * @s: Property to be retrieved 1083 * 1084 * This function looks for a property in the device node and returns the value 1085 * of the property if its found or 0 if the property is not found. 1086 * 1087 * Return: Value of the parameter if the parameter is found, or 0 otherwise 1088 */ 1089static bool get_bool(struct platform_device *ofdev, const char *s) 1090{ 1091 u32 *p = (u32 *)of_get_property(ofdev->dev.of_node, s, NULL); 1092 1093 if (p) { 1094 return (bool)*p; 1095 } else { 1096 dev_warn(&ofdev->dev, "Parameter %s not found," 1097 "defaulting to false\n", s); 1098 return 0; 1099 } 1100} 1101 1102static struct net_device_ops xemaclite_netdev_ops; 1103 1104/** 1105 * xemaclite_of_probe - Probe method for the Emaclite device. 1106 * @ofdev: Pointer to OF device structure 1107 * @match: Pointer to the structure used for matching a device 1108 * 1109 * This function probes for the Emaclite device in the device tree. 1110 * It initializes the driver data structure and the hardware, sets the MAC 1111 * address and registers the network device. 1112 * It also registers a mii_bus for the Emaclite device, if MDIO is included 1113 * in the device. 1114 * 1115 * Return: 0, if the driver is bound to the Emaclite device, or 1116 * a negative error if there is failure. 1117 */ 1118static int __devinit xemaclite_of_probe(struct platform_device *ofdev, 1119 const struct of_device_id *match) 1120{ 1121 struct resource r_irq; /* Interrupt resources */ 1122 struct resource r_mem; /* IO mem resources */ 1123 struct net_device *ndev = NULL; 1124 struct net_local *lp = NULL; 1125 struct device *dev = &ofdev->dev; 1126 const void *mac_address; 1127 1128 int rc = 0; 1129 1130 dev_info(dev, "Device Tree Probing\n"); 1131 1132 /* Get iospace for the device */ 1133 rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem); 1134 if (rc) { 1135 dev_err(dev, "invalid address\n"); 1136 return rc; 1137 } 1138 1139 /* Get IRQ for the device */ 1140 rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq); 1141 if (rc == NO_IRQ) { 1142 dev_err(dev, "no IRQ found\n"); 1143 return rc; 1144 } 1145 1146 /* Create an ethernet device instance */ 1147 ndev = alloc_etherdev(sizeof(struct net_local)); 1148 if (!ndev) { 1149 dev_err(dev, "Could not allocate network device\n"); 1150 return -ENOMEM; 1151 } 1152 1153 dev_set_drvdata(dev, ndev); 1154 SET_NETDEV_DEV(ndev, &ofdev->dev); 1155 1156 ndev->irq = r_irq.start; 1157 ndev->mem_start = r_mem.start; 1158 ndev->mem_end = r_mem.end; 1159 1160 lp = netdev_priv(ndev); 1161 lp->ndev = ndev; 1162 1163 if (!request_mem_region(ndev->mem_start, 1164 ndev->mem_end - ndev->mem_start + 1, 1165 DRIVER_NAME)) { 1166 dev_err(dev, "Couldn't lock memory region at %p\n", 1167 (void *)ndev->mem_start); 1168 rc = -EBUSY; 1169 goto error2; 1170 } 1171 1172 /* Get the virtual base address for the device */ 1173 lp->base_addr = ioremap(r_mem.start, resource_size(&r_mem)); 1174 if (NULL == lp->base_addr) { 1175 dev_err(dev, "EmacLite: Could not allocate iomem\n"); 1176 rc = -EIO; 1177 goto error1; 1178 } 1179 1180 spin_lock_init(&lp->reset_lock); 1181 lp->next_tx_buf_to_use = 0x0; 1182 lp->next_rx_buf_to_use = 0x0; 1183 lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong"); 1184 lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong"); 1185 mac_address = of_get_mac_address(ofdev->dev.of_node); 1186 1187 if (mac_address) 1188 /* Set the MAC address. */ 1189 memcpy(ndev->dev_addr, mac_address, 6); 1190 else 1191 dev_warn(dev, "No MAC address found\n"); 1192 1193 /* Clear the Tx CSR's in case this is a restart */ 1194 out_be32(lp->base_addr + XEL_TSR_OFFSET, 0); 1195 out_be32(lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, 0); 1196 1197 /* Set the MAC address in the EmacLite device */ 1198 xemaclite_update_address(lp, ndev->dev_addr); 1199 1200 lp->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0); 1201 rc = xemaclite_mdio_setup(lp, &ofdev->dev); 1202 if (rc) 1203 dev_warn(&ofdev->dev, "error registering MDIO bus\n"); 1204 1205 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); 1206 1207 ndev->netdev_ops = &xemaclite_netdev_ops; 1208 ndev->flags &= ~IFF_MULTICAST; 1209 ndev->watchdog_timeo = TX_TIMEOUT; 1210 1211 /* Finally, register the device */ 1212 rc = register_netdev(ndev); 1213 if (rc) { 1214 dev_err(dev, 1215 "Cannot register network device, aborting\n"); 1216 goto error1; 1217 } 1218 1219 dev_info(dev, 1220 "Xilinx EmacLite at 0x%08X mapped to 0x%08X, irq=%d\n", 1221 (unsigned int __force)ndev->mem_start, 1222 (unsigned int __force)lp->base_addr, ndev->irq); 1223 return 0; 1224 1225error1: 1226 release_mem_region(ndev->mem_start, resource_size(&r_mem)); 1227 1228error2: 1229 xemaclite_remove_ndev(ndev); 1230 return rc; 1231} 1232 1233/** 1234 * xemaclite_of_remove - Unbind the driver from the Emaclite device. 1235 * @of_dev: Pointer to OF device structure 1236 * 1237 * This function is called if a device is physically removed from the system or 1238 * if the driver module is being unloaded. It frees any resources allocated to 1239 * the device. 1240 * 1241 * Return: 0, always. 1242 */ 1243static int __devexit xemaclite_of_remove(struct platform_device *of_dev) 1244{ 1245 struct device *dev = &of_dev->dev; 1246 struct net_device *ndev = dev_get_drvdata(dev); 1247 1248 struct net_local *lp = (struct net_local *) netdev_priv(ndev); 1249 1250 /* Un-register the mii_bus, if configured */ 1251 if (lp->has_mdio) { 1252 mdiobus_unregister(lp->mii_bus); 1253 kfree(lp->mii_bus->irq); 1254 mdiobus_free(lp->mii_bus); 1255 lp->mii_bus = NULL; 1256 } 1257 1258 unregister_netdev(ndev); 1259 1260 if (lp->phy_node) 1261 of_node_put(lp->phy_node); 1262 lp->phy_node = NULL; 1263 1264 release_mem_region(ndev->mem_start, ndev->mem_end-ndev->mem_start + 1); 1265 1266 xemaclite_remove_ndev(ndev); 1267 dev_set_drvdata(dev, NULL); 1268 1269 return 0; 1270} 1271 1272static struct net_device_ops xemaclite_netdev_ops = { 1273 .ndo_open = xemaclite_open, 1274 .ndo_stop = xemaclite_close, 1275 .ndo_start_xmit = xemaclite_send, 1276 .ndo_set_mac_address = xemaclite_set_mac_address, 1277 .ndo_tx_timeout = xemaclite_tx_timeout, 1278 .ndo_get_stats = xemaclite_get_stats, 1279}; 1280 1281/* Match table for OF platform binding */ 1282static struct of_device_id xemaclite_of_match[] __devinitdata = { 1283 { .compatible = "xlnx,opb-ethernetlite-1.01.a", }, 1284 { .compatible = "xlnx,opb-ethernetlite-1.01.b", }, 1285 { .compatible = "xlnx,xps-ethernetlite-1.00.a", }, 1286 { .compatible = "xlnx,xps-ethernetlite-2.00.a", }, 1287 { .compatible = "xlnx,xps-ethernetlite-2.01.a", }, 1288 { .compatible = "xlnx,xps-ethernetlite-3.00.a", }, 1289 { /* end of list */ }, 1290}; 1291MODULE_DEVICE_TABLE(of, xemaclite_of_match); 1292 1293static struct of_platform_driver xemaclite_of_driver = { 1294 .driver = { 1295 .name = DRIVER_NAME, 1296 .owner = THIS_MODULE, 1297 .of_match_table = xemaclite_of_match, 1298 }, 1299 .probe = xemaclite_of_probe, 1300 .remove = __devexit_p(xemaclite_of_remove), 1301}; 1302 1303/** 1304 * xgpiopss_init - Initial driver registration call 1305 * 1306 * Return: 0 upon success, or a negative error upon failure. 1307 */ 1308static int __init xemaclite_init(void) 1309{ 1310 /* No kernel boot options used, we just need to register the driver */ 1311 return of_register_platform_driver(&xemaclite_of_driver); 1312} 1313 1314/** 1315 * xemaclite_cleanup - Driver un-registration call 1316 */ 1317static void __exit xemaclite_cleanup(void) 1318{ 1319 of_unregister_platform_driver(&xemaclite_of_driver); 1320} 1321 1322module_init(xemaclite_init); 1323module_exit(xemaclite_cleanup); 1324 1325MODULE_AUTHOR("Xilinx, Inc."); 1326MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver"); 1327MODULE_LICENSE("GPL"); 1328