1 /* 2 * Driver for Xilinx TEMAC Ethernet device 3 * 4 * Copyright (c) 2008 Nissin Systems Co., Ltd., Yoshio Kashiwagi 5 * Copyright (c) 2005-2008 DLA Systems, David H. Lynch Jr. <dhlii@dlasys.net> 6 * Copyright (c) 2008-2009 Secret Lab Technologies Ltd. 7 * 8 * This is a driver for the Xilinx ll_temac ipcore which is often used 9 * in the Virtex and Spartan series of chips. 10 * 11 * Notes: 12 * - The ll_temac hardware uses indirect access for many of the TEMAC 13 * registers, include the MDIO bus. However, indirect access to MDIO 14 * registers take considerably more clock cycles than to TEMAC registers. 15 * MDIO accesses are long, so threads doing them should probably sleep 16 * rather than busywait. However, since only one indirect access can be 17 * in progress at any given time, that means that *all* indirect accesses 18 * could end up sleeping (to wait for an MDIO access to complete). 19 * Fortunately none of the indirect accesses are on the 'hot' path for tx 20 * or rx, so this should be okay. 21 * 22 * TODO: 23 * - Factor out locallink DMA code into separate driver 24 * - Fix multicast assignment. 25 * - Fix support for hardware checksumming. 26 * - Testing. Lots and lots of testing. 27 * 28 */ 29 30 #include <linux/delay.h> 31 #include <linux/etherdevice.h> 32 #include <linux/mii.h> 33 #include <linux/module.h> 34 #include <linux/mutex.h> 35 #include <linux/netdevice.h> 36 #include <linux/of.h> 37 #include <linux/of_device.h> 38 #include <linux/of_irq.h> 39 #include <linux/of_mdio.h> 40 #include <linux/of_platform.h> 41 #include <linux/of_address.h> 42 #include <linux/skbuff.h> 43 #include <linux/spinlock.h> 44 #include <linux/tcp.h> /* needed for sizeof(tcphdr) */ 45 #include <linux/udp.h> /* needed for sizeof(udphdr) */ 46 #include <linux/phy.h> 47 #include <linux/in.h> 48 #include <linux/io.h> 49 #include <linux/ip.h> 50 #include <linux/slab.h> 51 #include <linux/interrupt.h> 52 #include <linux/dma-mapping.h> 53 54 #include "ll_temac.h" 55 56 #define TX_BD_NUM 64 57 #define RX_BD_NUM 128 58 59 /* --------------------------------------------------------------------- 60 * Low level register access functions 61 */ 62 63 u32 temac_ior(struct temac_local *lp, int offset) 64 { 65 return in_be32((u32 *)(lp->regs + offset)); 66 } 67 68 void temac_iow(struct temac_local *lp, int offset, u32 value) 69 { 70 out_be32((u32 *) (lp->regs + offset), value); 71 } 72 73 int temac_indirect_busywait(struct temac_local *lp) 74 { 75 unsigned long end = jiffies + 2; 76 77 while (!(temac_ior(lp, XTE_RDY0_OFFSET) & XTE_RDY0_HARD_ACS_RDY_MASK)) { 78 if (time_before_eq(end, jiffies)) { 79 WARN_ON(1); 80 return -ETIMEDOUT; 81 } 82 msleep(1); 83 } 84 return 0; 85 } 86 87 /** 88 * temac_indirect_in32 89 * 90 * lp->indirect_mutex must be held when calling this function 91 */ 92 u32 temac_indirect_in32(struct temac_local *lp, int reg) 93 { 94 u32 val; 95 96 if (temac_indirect_busywait(lp)) 97 return -ETIMEDOUT; 98 temac_iow(lp, XTE_CTL0_OFFSET, reg); 99 if (temac_indirect_busywait(lp)) 100 return -ETIMEDOUT; 101 val = temac_ior(lp, XTE_LSW0_OFFSET); 102 103 return val; 104 } 105 106 /** 107 * temac_indirect_out32 108 * 109 * lp->indirect_mutex must be held when calling this function 110 */ 111 void temac_indirect_out32(struct temac_local *lp, int reg, u32 value) 112 { 113 if (temac_indirect_busywait(lp)) 114 return; 115 temac_iow(lp, XTE_LSW0_OFFSET, value); 116 temac_iow(lp, XTE_CTL0_OFFSET, CNTLREG_WRITE_ENABLE_MASK | reg); 117 temac_indirect_busywait(lp); 118 } 119 120 /** 121 * temac_dma_in32 - Memory mapped DMA read, this function expects a 122 * register input that is based on DCR word addresses which 123 * are then converted to memory mapped byte addresses 124 */ 125 static u32 temac_dma_in32(struct temac_local *lp, int reg) 126 { 127 return in_be32((u32 *)(lp->sdma_regs + (reg << 2))); 128 } 129 130 /** 131 * temac_dma_out32 - Memory mapped DMA read, this function expects a 132 * register input that is based on DCR word addresses which 133 * are then converted to memory mapped byte addresses 134 */ 135 static void temac_dma_out32(struct temac_local *lp, int reg, u32 value) 136 { 137 out_be32((u32 *)(lp->sdma_regs + (reg << 2)), value); 138 } 139 140 /* DMA register access functions can be DCR based or memory mapped. 141 * The PowerPC 440 is DCR based, the PowerPC 405 and MicroBlaze are both 142 * memory mapped. 143 */ 144 #ifdef CONFIG_PPC_DCR 145 146 /** 147 * temac_dma_dcr_in32 - DCR based DMA read 148 */ 149 static u32 temac_dma_dcr_in(struct temac_local *lp, int reg) 150 { 151 return dcr_read(lp->sdma_dcrs, reg); 152 } 153 154 /** 155 * temac_dma_dcr_out32 - DCR based DMA write 156 */ 157 static void temac_dma_dcr_out(struct temac_local *lp, int reg, u32 value) 158 { 159 dcr_write(lp->sdma_dcrs, reg, value); 160 } 161 162 /** 163 * temac_dcr_setup - If the DMA is DCR based, then setup the address and 164 * I/O functions 165 */ 166 static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op, 167 struct device_node *np) 168 { 169 unsigned int dcrs; 170 171 /* setup the dcr address mapping if it's in the device tree */ 172 173 dcrs = dcr_resource_start(np, 0); 174 if (dcrs != 0) { 175 lp->sdma_dcrs = dcr_map(np, dcrs, dcr_resource_len(np, 0)); 176 lp->dma_in = temac_dma_dcr_in; 177 lp->dma_out = temac_dma_dcr_out; 178 dev_dbg(&op->dev, "DCR base: %x\n", dcrs); 179 return 0; 180 } 181 /* no DCR in the device tree, indicate a failure */ 182 return -1; 183 } 184 185 #else 186 187 /* 188 * temac_dcr_setup - This is a stub for when DCR is not supported, 189 * such as with MicroBlaze 190 */ 191 static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op, 192 struct device_node *np) 193 { 194 return -1; 195 } 196 197 #endif 198 199 /** 200 * temac_dma_bd_release - Release buffer descriptor rings 201 */ 202 static void temac_dma_bd_release(struct net_device *ndev) 203 { 204 struct temac_local *lp = netdev_priv(ndev); 205 int i; 206 207 /* Reset Local Link (DMA) */ 208 lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST); 209 210 for (i = 0; i < RX_BD_NUM; i++) { 211 if (!lp->rx_skb[i]) 212 break; 213 else { 214 dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys, 215 XTE_MAX_JUMBO_FRAME_SIZE, DMA_FROM_DEVICE); 216 dev_kfree_skb(lp->rx_skb[i]); 217 } 218 } 219 if (lp->rx_bd_v) 220 dma_free_coherent(ndev->dev.parent, 221 sizeof(*lp->rx_bd_v) * RX_BD_NUM, 222 lp->rx_bd_v, lp->rx_bd_p); 223 if (lp->tx_bd_v) 224 dma_free_coherent(ndev->dev.parent, 225 sizeof(*lp->tx_bd_v) * TX_BD_NUM, 226 lp->tx_bd_v, lp->tx_bd_p); 227 kfree(lp->rx_skb); 228 } 229 230 /** 231 * temac_dma_bd_init - Setup buffer descriptor rings 232 */ 233 static int temac_dma_bd_init(struct net_device *ndev) 234 { 235 struct temac_local *lp = netdev_priv(ndev); 236 struct sk_buff *skb; 237 int i; 238 239 lp->rx_skb = kcalloc(RX_BD_NUM, sizeof(*lp->rx_skb), GFP_KERNEL); 240 if (!lp->rx_skb) 241 goto out; 242 243 /* allocate the tx and rx ring buffer descriptors. */ 244 /* returns a virtual address and a physical address. */ 245 lp->tx_bd_v = dma_zalloc_coherent(ndev->dev.parent, 246 sizeof(*lp->tx_bd_v) * TX_BD_NUM, 247 &lp->tx_bd_p, GFP_KERNEL); 248 if (!lp->tx_bd_v) 249 goto out; 250 251 lp->rx_bd_v = dma_zalloc_coherent(ndev->dev.parent, 252 sizeof(*lp->rx_bd_v) * RX_BD_NUM, 253 &lp->rx_bd_p, GFP_KERNEL); 254 if (!lp->rx_bd_v) 255 goto out; 256 257 for (i = 0; i < TX_BD_NUM; i++) { 258 lp->tx_bd_v[i].next = lp->tx_bd_p + 259 sizeof(*lp->tx_bd_v) * ((i + 1) % TX_BD_NUM); 260 } 261 262 for (i = 0; i < RX_BD_NUM; i++) { 263 lp->rx_bd_v[i].next = lp->rx_bd_p + 264 sizeof(*lp->rx_bd_v) * ((i + 1) % RX_BD_NUM); 265 266 skb = netdev_alloc_skb_ip_align(ndev, 267 XTE_MAX_JUMBO_FRAME_SIZE); 268 if (!skb) 269 goto out; 270 271 lp->rx_skb[i] = skb; 272 /* returns physical address of skb->data */ 273 lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent, 274 skb->data, 275 XTE_MAX_JUMBO_FRAME_SIZE, 276 DMA_FROM_DEVICE); 277 lp->rx_bd_v[i].len = XTE_MAX_JUMBO_FRAME_SIZE; 278 lp->rx_bd_v[i].app0 = STS_CTRL_APP0_IRQONEND; 279 } 280 281 lp->dma_out(lp, TX_CHNL_CTRL, 0x10220400 | 282 CHNL_CTRL_IRQ_EN | 283 CHNL_CTRL_IRQ_DLY_EN | 284 CHNL_CTRL_IRQ_COAL_EN); 285 /* 0x10220483 */ 286 /* 0x00100483 */ 287 lp->dma_out(lp, RX_CHNL_CTRL, 0xff070000 | 288 CHNL_CTRL_IRQ_EN | 289 CHNL_CTRL_IRQ_DLY_EN | 290 CHNL_CTRL_IRQ_COAL_EN | 291 CHNL_CTRL_IRQ_IOE); 292 /* 0xff010283 */ 293 294 lp->dma_out(lp, RX_CURDESC_PTR, lp->rx_bd_p); 295 lp->dma_out(lp, RX_TAILDESC_PTR, 296 lp->rx_bd_p + (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1))); 297 lp->dma_out(lp, TX_CURDESC_PTR, lp->tx_bd_p); 298 299 /* Init descriptor indexes */ 300 lp->tx_bd_ci = 0; 301 lp->tx_bd_next = 0; 302 lp->tx_bd_tail = 0; 303 lp->rx_bd_ci = 0; 304 305 return 0; 306 307 out: 308 temac_dma_bd_release(ndev); 309 return -ENOMEM; 310 } 311 312 /* --------------------------------------------------------------------- 313 * net_device_ops 314 */ 315 316 static void temac_do_set_mac_address(struct net_device *ndev) 317 { 318 struct temac_local *lp = netdev_priv(ndev); 319 320 /* set up unicast MAC address filter set its mac address */ 321 mutex_lock(&lp->indirect_mutex); 322 temac_indirect_out32(lp, XTE_UAW0_OFFSET, 323 (ndev->dev_addr[0]) | 324 (ndev->dev_addr[1] << 8) | 325 (ndev->dev_addr[2] << 16) | 326 (ndev->dev_addr[3] << 24)); 327 /* There are reserved bits in EUAW1 328 * so don't affect them Set MAC bits [47:32] in EUAW1 */ 329 temac_indirect_out32(lp, XTE_UAW1_OFFSET, 330 (ndev->dev_addr[4] & 0x000000ff) | 331 (ndev->dev_addr[5] << 8)); 332 mutex_unlock(&lp->indirect_mutex); 333 } 334 335 static int temac_init_mac_address(struct net_device *ndev, void *address) 336 { 337 memcpy(ndev->dev_addr, address, ETH_ALEN); 338 if (!is_valid_ether_addr(ndev->dev_addr)) 339 eth_hw_addr_random(ndev); 340 temac_do_set_mac_address(ndev); 341 return 0; 342 } 343 344 static int temac_set_mac_address(struct net_device *ndev, void *p) 345 { 346 struct sockaddr *addr = p; 347 348 if (!is_valid_ether_addr(addr->sa_data)) 349 return -EADDRNOTAVAIL; 350 memcpy(ndev->dev_addr, addr->sa_data, ETH_ALEN); 351 temac_do_set_mac_address(ndev); 352 return 0; 353 } 354 355 static void temac_set_multicast_list(struct net_device *ndev) 356 { 357 struct temac_local *lp = netdev_priv(ndev); 358 u32 multi_addr_msw, multi_addr_lsw, val; 359 int i; 360 361 mutex_lock(&lp->indirect_mutex); 362 if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) || 363 netdev_mc_count(ndev) > MULTICAST_CAM_TABLE_NUM) { 364 /* 365 * We must make the kernel realise we had to move 366 * into promisc mode or we start all out war on 367 * the cable. If it was a promisc request the 368 * flag is already set. If not we assert it. 369 */ 370 ndev->flags |= IFF_PROMISC; 371 temac_indirect_out32(lp, XTE_AFM_OFFSET, XTE_AFM_EPPRM_MASK); 372 dev_info(&ndev->dev, "Promiscuous mode enabled.\n"); 373 } else if (!netdev_mc_empty(ndev)) { 374 struct netdev_hw_addr *ha; 375 376 i = 0; 377 netdev_for_each_mc_addr(ha, ndev) { 378 if (i >= MULTICAST_CAM_TABLE_NUM) 379 break; 380 multi_addr_msw = ((ha->addr[3] << 24) | 381 (ha->addr[2] << 16) | 382 (ha->addr[1] << 8) | 383 (ha->addr[0])); 384 temac_indirect_out32(lp, XTE_MAW0_OFFSET, 385 multi_addr_msw); 386 multi_addr_lsw = ((ha->addr[5] << 8) | 387 (ha->addr[4]) | (i << 16)); 388 temac_indirect_out32(lp, XTE_MAW1_OFFSET, 389 multi_addr_lsw); 390 i++; 391 } 392 } else { 393 val = temac_indirect_in32(lp, XTE_AFM_OFFSET); 394 temac_indirect_out32(lp, XTE_AFM_OFFSET, 395 val & ~XTE_AFM_EPPRM_MASK); 396 temac_indirect_out32(lp, XTE_MAW0_OFFSET, 0); 397 temac_indirect_out32(lp, XTE_MAW1_OFFSET, 0); 398 dev_info(&ndev->dev, "Promiscuous mode disabled.\n"); 399 } 400 mutex_unlock(&lp->indirect_mutex); 401 } 402 403 struct temac_option { 404 int flg; 405 u32 opt; 406 u32 reg; 407 u32 m_or; 408 u32 m_and; 409 } temac_options[] = { 410 /* Turn on jumbo packet support for both Rx and Tx */ 411 { 412 .opt = XTE_OPTION_JUMBO, 413 .reg = XTE_TXC_OFFSET, 414 .m_or = XTE_TXC_TXJMBO_MASK, 415 }, 416 { 417 .opt = XTE_OPTION_JUMBO, 418 .reg = XTE_RXC1_OFFSET, 419 .m_or =XTE_RXC1_RXJMBO_MASK, 420 }, 421 /* Turn on VLAN packet support for both Rx and Tx */ 422 { 423 .opt = XTE_OPTION_VLAN, 424 .reg = XTE_TXC_OFFSET, 425 .m_or =XTE_TXC_TXVLAN_MASK, 426 }, 427 { 428 .opt = XTE_OPTION_VLAN, 429 .reg = XTE_RXC1_OFFSET, 430 .m_or =XTE_RXC1_RXVLAN_MASK, 431 }, 432 /* Turn on FCS stripping on receive packets */ 433 { 434 .opt = XTE_OPTION_FCS_STRIP, 435 .reg = XTE_RXC1_OFFSET, 436 .m_or =XTE_RXC1_RXFCS_MASK, 437 }, 438 /* Turn on FCS insertion on transmit packets */ 439 { 440 .opt = XTE_OPTION_FCS_INSERT, 441 .reg = XTE_TXC_OFFSET, 442 .m_or =XTE_TXC_TXFCS_MASK, 443 }, 444 /* Turn on length/type field checking on receive packets */ 445 { 446 .opt = XTE_OPTION_LENTYPE_ERR, 447 .reg = XTE_RXC1_OFFSET, 448 .m_or =XTE_RXC1_RXLT_MASK, 449 }, 450 /* Turn on flow control */ 451 { 452 .opt = XTE_OPTION_FLOW_CONTROL, 453 .reg = XTE_FCC_OFFSET, 454 .m_or =XTE_FCC_RXFLO_MASK, 455 }, 456 /* Turn on flow control */ 457 { 458 .opt = XTE_OPTION_FLOW_CONTROL, 459 .reg = XTE_FCC_OFFSET, 460 .m_or =XTE_FCC_TXFLO_MASK, 461 }, 462 /* Turn on promiscuous frame filtering (all frames are received ) */ 463 { 464 .opt = XTE_OPTION_PROMISC, 465 .reg = XTE_AFM_OFFSET, 466 .m_or =XTE_AFM_EPPRM_MASK, 467 }, 468 /* Enable transmitter if not already enabled */ 469 { 470 .opt = XTE_OPTION_TXEN, 471 .reg = XTE_TXC_OFFSET, 472 .m_or =XTE_TXC_TXEN_MASK, 473 }, 474 /* Enable receiver? */ 475 { 476 .opt = XTE_OPTION_RXEN, 477 .reg = XTE_RXC1_OFFSET, 478 .m_or =XTE_RXC1_RXEN_MASK, 479 }, 480 {} 481 }; 482 483 /** 484 * temac_setoptions 485 */ 486 static u32 temac_setoptions(struct net_device *ndev, u32 options) 487 { 488 struct temac_local *lp = netdev_priv(ndev); 489 struct temac_option *tp = &temac_options[0]; 490 int reg; 491 492 mutex_lock(&lp->indirect_mutex); 493 while (tp->opt) { 494 reg = temac_indirect_in32(lp, tp->reg) & ~tp->m_or; 495 if (options & tp->opt) 496 reg |= tp->m_or; 497 temac_indirect_out32(lp, tp->reg, reg); 498 tp++; 499 } 500 lp->options |= options; 501 mutex_unlock(&lp->indirect_mutex); 502 503 return 0; 504 } 505 506 /* Initialize temac */ 507 static void temac_device_reset(struct net_device *ndev) 508 { 509 struct temac_local *lp = netdev_priv(ndev); 510 u32 timeout; 511 u32 val; 512 513 /* Perform a software reset */ 514 515 /* 0x300 host enable bit ? */ 516 /* reset PHY through control register ?:1 */ 517 518 dev_dbg(&ndev->dev, "%s()\n", __func__); 519 520 mutex_lock(&lp->indirect_mutex); 521 /* Reset the receiver and wait for it to finish reset */ 522 temac_indirect_out32(lp, XTE_RXC1_OFFSET, XTE_RXC1_RXRST_MASK); 523 timeout = 1000; 524 while (temac_indirect_in32(lp, XTE_RXC1_OFFSET) & XTE_RXC1_RXRST_MASK) { 525 udelay(1); 526 if (--timeout == 0) { 527 dev_err(&ndev->dev, 528 "temac_device_reset RX reset timeout!!\n"); 529 break; 530 } 531 } 532 533 /* Reset the transmitter and wait for it to finish reset */ 534 temac_indirect_out32(lp, XTE_TXC_OFFSET, XTE_TXC_TXRST_MASK); 535 timeout = 1000; 536 while (temac_indirect_in32(lp, XTE_TXC_OFFSET) & XTE_TXC_TXRST_MASK) { 537 udelay(1); 538 if (--timeout == 0) { 539 dev_err(&ndev->dev, 540 "temac_device_reset TX reset timeout!!\n"); 541 break; 542 } 543 } 544 545 /* Disable the receiver */ 546 val = temac_indirect_in32(lp, XTE_RXC1_OFFSET); 547 temac_indirect_out32(lp, XTE_RXC1_OFFSET, val & ~XTE_RXC1_RXEN_MASK); 548 549 /* Reset Local Link (DMA) */ 550 lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST); 551 timeout = 1000; 552 while (lp->dma_in(lp, DMA_CONTROL_REG) & DMA_CONTROL_RST) { 553 udelay(1); 554 if (--timeout == 0) { 555 dev_err(&ndev->dev, 556 "temac_device_reset DMA reset timeout!!\n"); 557 break; 558 } 559 } 560 lp->dma_out(lp, DMA_CONTROL_REG, DMA_TAIL_ENABLE); 561 562 if (temac_dma_bd_init(ndev)) { 563 dev_err(&ndev->dev, 564 "temac_device_reset descriptor allocation failed\n"); 565 } 566 567 temac_indirect_out32(lp, XTE_RXC0_OFFSET, 0); 568 temac_indirect_out32(lp, XTE_RXC1_OFFSET, 0); 569 temac_indirect_out32(lp, XTE_TXC_OFFSET, 0); 570 temac_indirect_out32(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK); 571 572 mutex_unlock(&lp->indirect_mutex); 573 574 /* Sync default options with HW 575 * but leave receiver and transmitter disabled. */ 576 temac_setoptions(ndev, 577 lp->options & ~(XTE_OPTION_TXEN | XTE_OPTION_RXEN)); 578 579 temac_do_set_mac_address(ndev); 580 581 /* Set address filter table */ 582 temac_set_multicast_list(ndev); 583 if (temac_setoptions(ndev, lp->options)) 584 dev_err(&ndev->dev, "Error setting TEMAC options\n"); 585 586 /* Init Driver variable */ 587 ndev->trans_start = jiffies; /* prevent tx timeout */ 588 } 589 590 void temac_adjust_link(struct net_device *ndev) 591 { 592 struct temac_local *lp = netdev_priv(ndev); 593 struct phy_device *phy = lp->phy_dev; 594 u32 mii_speed; 595 int link_state; 596 597 /* hash together the state values to decide if something has changed */ 598 link_state = phy->speed | (phy->duplex << 1) | phy->link; 599 600 mutex_lock(&lp->indirect_mutex); 601 if (lp->last_link != link_state) { 602 mii_speed = temac_indirect_in32(lp, XTE_EMCFG_OFFSET); 603 mii_speed &= ~XTE_EMCFG_LINKSPD_MASK; 604 605 switch (phy->speed) { 606 case SPEED_1000: mii_speed |= XTE_EMCFG_LINKSPD_1000; break; 607 case SPEED_100: mii_speed |= XTE_EMCFG_LINKSPD_100; break; 608 case SPEED_10: mii_speed |= XTE_EMCFG_LINKSPD_10; break; 609 } 610 611 /* Write new speed setting out to TEMAC */ 612 temac_indirect_out32(lp, XTE_EMCFG_OFFSET, mii_speed); 613 lp->last_link = link_state; 614 phy_print_status(phy); 615 } 616 mutex_unlock(&lp->indirect_mutex); 617 } 618 619 static void temac_start_xmit_done(struct net_device *ndev) 620 { 621 struct temac_local *lp = netdev_priv(ndev); 622 struct cdmac_bd *cur_p; 623 unsigned int stat = 0; 624 625 cur_p = &lp->tx_bd_v[lp->tx_bd_ci]; 626 stat = cur_p->app0; 627 628 while (stat & STS_CTRL_APP0_CMPLT) { 629 dma_unmap_single(ndev->dev.parent, cur_p->phys, cur_p->len, 630 DMA_TO_DEVICE); 631 if (cur_p->app4) 632 dev_kfree_skb_irq((struct sk_buff *)cur_p->app4); 633 cur_p->app0 = 0; 634 cur_p->app1 = 0; 635 cur_p->app2 = 0; 636 cur_p->app3 = 0; 637 cur_p->app4 = 0; 638 639 ndev->stats.tx_packets++; 640 ndev->stats.tx_bytes += cur_p->len; 641 642 lp->tx_bd_ci++; 643 if (lp->tx_bd_ci >= TX_BD_NUM) 644 lp->tx_bd_ci = 0; 645 646 cur_p = &lp->tx_bd_v[lp->tx_bd_ci]; 647 stat = cur_p->app0; 648 } 649 650 netif_wake_queue(ndev); 651 } 652 653 static inline int temac_check_tx_bd_space(struct temac_local *lp, int num_frag) 654 { 655 struct cdmac_bd *cur_p; 656 int tail; 657 658 tail = lp->tx_bd_tail; 659 cur_p = &lp->tx_bd_v[tail]; 660 661 do { 662 if (cur_p->app0) 663 return NETDEV_TX_BUSY; 664 665 tail++; 666 if (tail >= TX_BD_NUM) 667 tail = 0; 668 669 cur_p = &lp->tx_bd_v[tail]; 670 num_frag--; 671 } while (num_frag >= 0); 672 673 return 0; 674 } 675 676 static int temac_start_xmit(struct sk_buff *skb, struct net_device *ndev) 677 { 678 struct temac_local *lp = netdev_priv(ndev); 679 struct cdmac_bd *cur_p; 680 dma_addr_t start_p, tail_p; 681 int ii; 682 unsigned long num_frag; 683 skb_frag_t *frag; 684 685 num_frag = skb_shinfo(skb)->nr_frags; 686 frag = &skb_shinfo(skb)->frags[0]; 687 start_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail; 688 cur_p = &lp->tx_bd_v[lp->tx_bd_tail]; 689 690 if (temac_check_tx_bd_space(lp, num_frag)) { 691 if (!netif_queue_stopped(ndev)) { 692 netif_stop_queue(ndev); 693 return NETDEV_TX_BUSY; 694 } 695 return NETDEV_TX_BUSY; 696 } 697 698 cur_p->app0 = 0; 699 if (skb->ip_summed == CHECKSUM_PARTIAL) { 700 unsigned int csum_start_off = skb_checksum_start_offset(skb); 701 unsigned int csum_index_off = csum_start_off + skb->csum_offset; 702 703 cur_p->app0 |= 1; /* TX Checksum Enabled */ 704 cur_p->app1 = (csum_start_off << 16) | csum_index_off; 705 cur_p->app2 = 0; /* initial checksum seed */ 706 } 707 708 cur_p->app0 |= STS_CTRL_APP0_SOP; 709 cur_p->len = skb_headlen(skb); 710 cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, skb->len, 711 DMA_TO_DEVICE); 712 cur_p->app4 = (unsigned long)skb; 713 714 for (ii = 0; ii < num_frag; ii++) { 715 lp->tx_bd_tail++; 716 if (lp->tx_bd_tail >= TX_BD_NUM) 717 lp->tx_bd_tail = 0; 718 719 cur_p = &lp->tx_bd_v[lp->tx_bd_tail]; 720 cur_p->phys = dma_map_single(ndev->dev.parent, 721 skb_frag_address(frag), 722 skb_frag_size(frag), DMA_TO_DEVICE); 723 cur_p->len = skb_frag_size(frag); 724 cur_p->app0 = 0; 725 frag++; 726 } 727 cur_p->app0 |= STS_CTRL_APP0_EOP; 728 729 tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail; 730 lp->tx_bd_tail++; 731 if (lp->tx_bd_tail >= TX_BD_NUM) 732 lp->tx_bd_tail = 0; 733 734 skb_tx_timestamp(skb); 735 736 /* Kick off the transfer */ 737 lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */ 738 739 return NETDEV_TX_OK; 740 } 741 742 743 static void ll_temac_recv(struct net_device *ndev) 744 { 745 struct temac_local *lp = netdev_priv(ndev); 746 struct sk_buff *skb, *new_skb; 747 unsigned int bdstat; 748 struct cdmac_bd *cur_p; 749 dma_addr_t tail_p; 750 int length; 751 unsigned long flags; 752 753 spin_lock_irqsave(&lp->rx_lock, flags); 754 755 tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci; 756 cur_p = &lp->rx_bd_v[lp->rx_bd_ci]; 757 758 bdstat = cur_p->app0; 759 while ((bdstat & STS_CTRL_APP0_CMPLT)) { 760 761 skb = lp->rx_skb[lp->rx_bd_ci]; 762 length = cur_p->app4 & 0x3FFF; 763 764 dma_unmap_single(ndev->dev.parent, cur_p->phys, length, 765 DMA_FROM_DEVICE); 766 767 skb_put(skb, length); 768 skb->protocol = eth_type_trans(skb, ndev); 769 skb_checksum_none_assert(skb); 770 771 /* if we're doing rx csum offload, set it up */ 772 if (((lp->temac_features & TEMAC_FEATURE_RX_CSUM) != 0) && 773 (skb->protocol == htons(ETH_P_IP)) && 774 (skb->len > 64)) { 775 776 skb->csum = cur_p->app3 & 0xFFFF; 777 skb->ip_summed = CHECKSUM_COMPLETE; 778 } 779 780 if (!skb_defer_rx_timestamp(skb)) 781 netif_rx(skb); 782 783 ndev->stats.rx_packets++; 784 ndev->stats.rx_bytes += length; 785 786 new_skb = netdev_alloc_skb_ip_align(ndev, 787 XTE_MAX_JUMBO_FRAME_SIZE); 788 if (!new_skb) { 789 spin_unlock_irqrestore(&lp->rx_lock, flags); 790 return; 791 } 792 793 cur_p->app0 = STS_CTRL_APP0_IRQONEND; 794 cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data, 795 XTE_MAX_JUMBO_FRAME_SIZE, 796 DMA_FROM_DEVICE); 797 cur_p->len = XTE_MAX_JUMBO_FRAME_SIZE; 798 lp->rx_skb[lp->rx_bd_ci] = new_skb; 799 800 lp->rx_bd_ci++; 801 if (lp->rx_bd_ci >= RX_BD_NUM) 802 lp->rx_bd_ci = 0; 803 804 cur_p = &lp->rx_bd_v[lp->rx_bd_ci]; 805 bdstat = cur_p->app0; 806 } 807 lp->dma_out(lp, RX_TAILDESC_PTR, tail_p); 808 809 spin_unlock_irqrestore(&lp->rx_lock, flags); 810 } 811 812 static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev) 813 { 814 struct net_device *ndev = _ndev; 815 struct temac_local *lp = netdev_priv(ndev); 816 unsigned int status; 817 818 status = lp->dma_in(lp, TX_IRQ_REG); 819 lp->dma_out(lp, TX_IRQ_REG, status); 820 821 if (status & (IRQ_COAL | IRQ_DLY)) 822 temac_start_xmit_done(lp->ndev); 823 if (status & 0x080) 824 dev_err(&ndev->dev, "DMA error 0x%x\n", status); 825 826 return IRQ_HANDLED; 827 } 828 829 static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev) 830 { 831 struct net_device *ndev = _ndev; 832 struct temac_local *lp = netdev_priv(ndev); 833 unsigned int status; 834 835 /* Read and clear the status registers */ 836 status = lp->dma_in(lp, RX_IRQ_REG); 837 lp->dma_out(lp, RX_IRQ_REG, status); 838 839 if (status & (IRQ_COAL | IRQ_DLY)) 840 ll_temac_recv(lp->ndev); 841 842 return IRQ_HANDLED; 843 } 844 845 static int temac_open(struct net_device *ndev) 846 { 847 struct temac_local *lp = netdev_priv(ndev); 848 int rc; 849 850 dev_dbg(&ndev->dev, "temac_open()\n"); 851 852 if (lp->phy_node) { 853 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node, 854 temac_adjust_link, 0, 0); 855 if (!lp->phy_dev) { 856 dev_err(lp->dev, "of_phy_connect() failed\n"); 857 return -ENODEV; 858 } 859 860 phy_start(lp->phy_dev); 861 } 862 863 temac_device_reset(ndev); 864 865 rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev); 866 if (rc) 867 goto err_tx_irq; 868 rc = request_irq(lp->rx_irq, ll_temac_rx_irq, 0, ndev->name, ndev); 869 if (rc) 870 goto err_rx_irq; 871 872 return 0; 873 874 err_rx_irq: 875 free_irq(lp->tx_irq, ndev); 876 err_tx_irq: 877 if (lp->phy_dev) 878 phy_disconnect(lp->phy_dev); 879 lp->phy_dev = NULL; 880 dev_err(lp->dev, "request_irq() failed\n"); 881 return rc; 882 } 883 884 static int temac_stop(struct net_device *ndev) 885 { 886 struct temac_local *lp = netdev_priv(ndev); 887 888 dev_dbg(&ndev->dev, "temac_close()\n"); 889 890 free_irq(lp->tx_irq, ndev); 891 free_irq(lp->rx_irq, ndev); 892 893 if (lp->phy_dev) 894 phy_disconnect(lp->phy_dev); 895 lp->phy_dev = NULL; 896 897 temac_dma_bd_release(ndev); 898 899 return 0; 900 } 901 902 #ifdef CONFIG_NET_POLL_CONTROLLER 903 static void 904 temac_poll_controller(struct net_device *ndev) 905 { 906 struct temac_local *lp = netdev_priv(ndev); 907 908 disable_irq(lp->tx_irq); 909 disable_irq(lp->rx_irq); 910 911 ll_temac_rx_irq(lp->tx_irq, ndev); 912 ll_temac_tx_irq(lp->rx_irq, ndev); 913 914 enable_irq(lp->tx_irq); 915 enable_irq(lp->rx_irq); 916 } 917 #endif 918 919 static int temac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd) 920 { 921 struct temac_local *lp = netdev_priv(ndev); 922 923 if (!netif_running(ndev)) 924 return -EINVAL; 925 926 if (!lp->phy_dev) 927 return -EINVAL; 928 929 return phy_mii_ioctl(lp->phy_dev, rq, cmd); 930 } 931 932 static const struct net_device_ops temac_netdev_ops = { 933 .ndo_open = temac_open, 934 .ndo_stop = temac_stop, 935 .ndo_start_xmit = temac_start_xmit, 936 .ndo_set_mac_address = temac_set_mac_address, 937 .ndo_validate_addr = eth_validate_addr, 938 .ndo_do_ioctl = temac_ioctl, 939 #ifdef CONFIG_NET_POLL_CONTROLLER 940 .ndo_poll_controller = temac_poll_controller, 941 #endif 942 }; 943 944 /* --------------------------------------------------------------------- 945 * SYSFS device attributes 946 */ 947 static ssize_t temac_show_llink_regs(struct device *dev, 948 struct device_attribute *attr, char *buf) 949 { 950 struct net_device *ndev = dev_get_drvdata(dev); 951 struct temac_local *lp = netdev_priv(ndev); 952 int i, len = 0; 953 954 for (i = 0; i < 0x11; i++) 955 len += sprintf(buf + len, "%.8x%s", lp->dma_in(lp, i), 956 (i % 8) == 7 ? "\n" : " "); 957 len += sprintf(buf + len, "\n"); 958 959 return len; 960 } 961 962 static DEVICE_ATTR(llink_regs, 0440, temac_show_llink_regs, NULL); 963 964 static struct attribute *temac_device_attrs[] = { 965 &dev_attr_llink_regs.attr, 966 NULL, 967 }; 968 969 static const struct attribute_group temac_attr_group = { 970 .attrs = temac_device_attrs, 971 }; 972 973 /* ethtool support */ 974 static int temac_get_settings(struct net_device *ndev, struct ethtool_cmd *cmd) 975 { 976 struct temac_local *lp = netdev_priv(ndev); 977 return phy_ethtool_gset(lp->phy_dev, cmd); 978 } 979 980 static int temac_set_settings(struct net_device *ndev, struct ethtool_cmd *cmd) 981 { 982 struct temac_local *lp = netdev_priv(ndev); 983 return phy_ethtool_sset(lp->phy_dev, cmd); 984 } 985 986 static int temac_nway_reset(struct net_device *ndev) 987 { 988 struct temac_local *lp = netdev_priv(ndev); 989 return phy_start_aneg(lp->phy_dev); 990 } 991 992 static const struct ethtool_ops temac_ethtool_ops = { 993 .get_settings = temac_get_settings, 994 .set_settings = temac_set_settings, 995 .nway_reset = temac_nway_reset, 996 .get_link = ethtool_op_get_link, 997 .get_ts_info = ethtool_op_get_ts_info, 998 }; 999 1000 static int temac_of_probe(struct platform_device *op) 1001 { 1002 struct device_node *np; 1003 struct temac_local *lp; 1004 struct net_device *ndev; 1005 const void *addr; 1006 __be32 *p; 1007 int size, rc = 0; 1008 1009 /* Init network device structure */ 1010 ndev = alloc_etherdev(sizeof(*lp)); 1011 if (!ndev) 1012 return -ENOMEM; 1013 1014 platform_set_drvdata(op, ndev); 1015 SET_NETDEV_DEV(ndev, &op->dev); 1016 ndev->flags &= ~IFF_MULTICAST; /* clear multicast */ 1017 ndev->features = NETIF_F_SG; 1018 ndev->netdev_ops = &temac_netdev_ops; 1019 ndev->ethtool_ops = &temac_ethtool_ops; 1020 #if 0 1021 ndev->features |= NETIF_F_IP_CSUM; /* Can checksum TCP/UDP over IPv4. */ 1022 ndev->features |= NETIF_F_HW_CSUM; /* Can checksum all the packets. */ 1023 ndev->features |= NETIF_F_IPV6_CSUM; /* Can checksum IPV6 TCP/UDP */ 1024 ndev->features |= NETIF_F_HIGHDMA; /* Can DMA to high memory. */ 1025 ndev->features |= NETIF_F_HW_VLAN_CTAG_TX; /* Transmit VLAN hw accel */ 1026 ndev->features |= NETIF_F_HW_VLAN_CTAG_RX; /* Receive VLAN hw acceleration */ 1027 ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; /* Receive VLAN filtering */ 1028 ndev->features |= NETIF_F_VLAN_CHALLENGED; /* cannot handle VLAN pkts */ 1029 ndev->features |= NETIF_F_GSO; /* Enable software GSO. */ 1030 ndev->features |= NETIF_F_MULTI_QUEUE; /* Has multiple TX/RX queues */ 1031 ndev->features |= NETIF_F_LRO; /* large receive offload */ 1032 #endif 1033 1034 /* setup temac private info structure */ 1035 lp = netdev_priv(ndev); 1036 lp->ndev = ndev; 1037 lp->dev = &op->dev; 1038 lp->options = XTE_OPTION_DEFAULTS; 1039 spin_lock_init(&lp->rx_lock); 1040 mutex_init(&lp->indirect_mutex); 1041 1042 /* map device registers */ 1043 lp->regs = of_iomap(op->dev.of_node, 0); 1044 if (!lp->regs) { 1045 dev_err(&op->dev, "could not map temac regs.\n"); 1046 rc = -ENOMEM; 1047 goto nodev; 1048 } 1049 1050 /* Setup checksum offload, but default to off if not specified */ 1051 lp->temac_features = 0; 1052 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,txcsum", NULL); 1053 if (p && be32_to_cpu(*p)) { 1054 lp->temac_features |= TEMAC_FEATURE_TX_CSUM; 1055 /* Can checksum TCP/UDP over IPv4. */ 1056 ndev->features |= NETIF_F_IP_CSUM; 1057 } 1058 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,rxcsum", NULL); 1059 if (p && be32_to_cpu(*p)) 1060 lp->temac_features |= TEMAC_FEATURE_RX_CSUM; 1061 1062 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */ 1063 np = of_parse_phandle(op->dev.of_node, "llink-connected", 0); 1064 if (!np) { 1065 dev_err(&op->dev, "could not find DMA node\n"); 1066 rc = -ENODEV; 1067 goto err_iounmap; 1068 } 1069 1070 /* Setup the DMA register accesses, could be DCR or memory mapped */ 1071 if (temac_dcr_setup(lp, op, np)) { 1072 1073 /* no DCR in the device tree, try non-DCR */ 1074 lp->sdma_regs = of_iomap(np, 0); 1075 if (lp->sdma_regs) { 1076 lp->dma_in = temac_dma_in32; 1077 lp->dma_out = temac_dma_out32; 1078 dev_dbg(&op->dev, "MEM base: %p\n", lp->sdma_regs); 1079 } else { 1080 dev_err(&op->dev, "unable to map DMA registers\n"); 1081 of_node_put(np); 1082 goto err_iounmap; 1083 } 1084 } 1085 1086 lp->rx_irq = irq_of_parse_and_map(np, 0); 1087 lp->tx_irq = irq_of_parse_and_map(np, 1); 1088 1089 of_node_put(np); /* Finished with the DMA node; drop the reference */ 1090 1091 if (!lp->rx_irq || !lp->tx_irq) { 1092 dev_err(&op->dev, "could not determine irqs\n"); 1093 rc = -ENOMEM; 1094 goto err_iounmap_2; 1095 } 1096 1097 1098 /* Retrieve the MAC address */ 1099 addr = of_get_property(op->dev.of_node, "local-mac-address", &size); 1100 if ((!addr) || (size != 6)) { 1101 dev_err(&op->dev, "could not find MAC address\n"); 1102 rc = -ENODEV; 1103 goto err_iounmap_2; 1104 } 1105 temac_init_mac_address(ndev, (void *)addr); 1106 1107 rc = temac_mdio_setup(lp, op->dev.of_node); 1108 if (rc) 1109 dev_warn(&op->dev, "error registering MDIO bus\n"); 1110 1111 lp->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0); 1112 if (lp->phy_node) 1113 dev_dbg(lp->dev, "using PHY node %s (%p)\n", np->full_name, np); 1114 1115 /* Add the device attributes */ 1116 rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group); 1117 if (rc) { 1118 dev_err(lp->dev, "Error creating sysfs files\n"); 1119 goto err_iounmap_2; 1120 } 1121 1122 rc = register_netdev(lp->ndev); 1123 if (rc) { 1124 dev_err(lp->dev, "register_netdev() error (%i)\n", rc); 1125 goto err_register_ndev; 1126 } 1127 1128 return 0; 1129 1130 err_register_ndev: 1131 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group); 1132 err_iounmap_2: 1133 if (lp->sdma_regs) 1134 iounmap(lp->sdma_regs); 1135 err_iounmap: 1136 iounmap(lp->regs); 1137 nodev: 1138 free_netdev(ndev); 1139 ndev = NULL; 1140 return rc; 1141 } 1142 1143 static int temac_of_remove(struct platform_device *op) 1144 { 1145 struct net_device *ndev = platform_get_drvdata(op); 1146 struct temac_local *lp = netdev_priv(ndev); 1147 1148 temac_mdio_teardown(lp); 1149 unregister_netdev(ndev); 1150 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group); 1151 of_node_put(lp->phy_node); 1152 lp->phy_node = NULL; 1153 iounmap(lp->regs); 1154 if (lp->sdma_regs) 1155 iounmap(lp->sdma_regs); 1156 free_netdev(ndev); 1157 return 0; 1158 } 1159 1160 static struct of_device_id temac_of_match[] = { 1161 { .compatible = "xlnx,xps-ll-temac-1.01.b", }, 1162 { .compatible = "xlnx,xps-ll-temac-2.00.a", }, 1163 { .compatible = "xlnx,xps-ll-temac-2.02.a", }, 1164 { .compatible = "xlnx,xps-ll-temac-2.03.a", }, 1165 {}, 1166 }; 1167 MODULE_DEVICE_TABLE(of, temac_of_match); 1168 1169 static struct platform_driver temac_of_driver = { 1170 .probe = temac_of_probe, 1171 .remove = temac_of_remove, 1172 .driver = { 1173 .name = "xilinx_temac", 1174 .of_match_table = temac_of_match, 1175 }, 1176 }; 1177 1178 module_platform_driver(temac_of_driver); 1179 1180 MODULE_DESCRIPTION("Xilinx LL_TEMAC Ethernet driver"); 1181 MODULE_AUTHOR("Yoshio Kashiwagi"); 1182 MODULE_LICENSE("GPL"); 1183