1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * meth.c -- O2 Builtin 10/100 Ethernet driver 4 * 5 * Copyright (C) 2001-2003 Ilya Volynets 6 */ 7 #include <linux/delay.h> 8 #include <linux/dma-mapping.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 #include <linux/slab.h> 13 #include <linux/errno.h> 14 #include <linux/types.h> 15 #include <linux/interrupt.h> 16 17 #include <linux/in.h> 18 #include <linux/in6.h> 19 #include <linux/device.h> /* struct device, et al */ 20 #include <linux/netdevice.h> /* struct device, and other headers */ 21 #include <linux/etherdevice.h> /* eth_type_trans */ 22 #include <linux/ip.h> /* struct iphdr */ 23 #include <linux/tcp.h> /* struct tcphdr */ 24 #include <linux/skbuff.h> 25 #include <linux/mii.h> /* MII definitions */ 26 #include <linux/crc32.h> 27 28 #include <asm/ip32/mace.h> 29 #include <asm/ip32/ip32_ints.h> 30 31 #include <asm/io.h> 32 33 #include "meth.h" 34 35 #ifndef MFE_DEBUG 36 #define MFE_DEBUG 0 37 #endif 38 39 #if MFE_DEBUG>=1 40 #define DPRINTK(str,args...) printk(KERN_DEBUG "meth: %s: " str, __func__ , ## args) 41 #define MFE_RX_DEBUG 2 42 #else 43 #define DPRINTK(str,args...) 44 #define MFE_RX_DEBUG 0 45 #endif 46 47 48 static const char *meth_str="SGI O2 Fast Ethernet"; 49 50 /* The maximum time waited (in jiffies) before assuming a Tx failed. (400ms) */ 51 #define TX_TIMEOUT (400*HZ/1000) 52 53 static int timeout = TX_TIMEOUT; 54 module_param(timeout, int, 0); 55 56 /* 57 * Maximum number of multicast addresses to filter (vs. Rx-all-multicast). 58 * MACE Ethernet uses a 64 element hash table based on the Ethernet CRC. 59 */ 60 #define METH_MCF_LIMIT 32 61 62 /* 63 * This structure is private to each device. It is used to pass 64 * packets in and out, so there is place for a packet 65 */ 66 struct meth_private { 67 struct platform_device *pdev; 68 69 /* in-memory copy of MAC Control register */ 70 u64 mac_ctrl; 71 72 /* in-memory copy of DMA Control register */ 73 unsigned long dma_ctrl; 74 /* address of PHY, used by mdio_* functions, initialized in mdio_probe */ 75 unsigned long phy_addr; 76 tx_packet *tx_ring; 77 dma_addr_t tx_ring_dma; 78 struct sk_buff *tx_skbs[TX_RING_ENTRIES]; 79 dma_addr_t tx_skb_dmas[TX_RING_ENTRIES]; 80 unsigned long tx_read, tx_write, tx_count; 81 82 rx_packet *rx_ring[RX_RING_ENTRIES]; 83 dma_addr_t rx_ring_dmas[RX_RING_ENTRIES]; 84 struct sk_buff *rx_skbs[RX_RING_ENTRIES]; 85 unsigned long rx_write; 86 87 /* Multicast filter. */ 88 u64 mcast_filter; 89 90 spinlock_t meth_lock; 91 }; 92 93 static void meth_tx_timeout(struct net_device *dev); 94 static irqreturn_t meth_interrupt(int irq, void *dev_id); 95 96 /* global, initialized in ip32-setup.c */ 97 char o2meth_eaddr[8]={0,0,0,0,0,0,0,0}; 98 99 static inline void load_eaddr(struct net_device *dev) 100 { 101 int i; 102 u64 macaddr; 103 104 DPRINTK("Loading MAC Address: %pM\n", dev->dev_addr); 105 macaddr = 0; 106 for (i = 0; i < 6; i++) 107 macaddr |= (u64)dev->dev_addr[i] << ((5 - i) * 8); 108 109 mace->eth.mac_addr = macaddr; 110 } 111 112 /* 113 * Waits for BUSY status of mdio bus to clear 114 */ 115 #define WAIT_FOR_PHY(___rval) \ 116 while ((___rval = mace->eth.phy_data) & MDIO_BUSY) { \ 117 udelay(25); \ 118 } 119 /*read phy register, return value read */ 120 static unsigned long mdio_read(struct meth_private *priv, unsigned long phyreg) 121 { 122 unsigned long rval; 123 WAIT_FOR_PHY(rval); 124 mace->eth.phy_regs = (priv->phy_addr << 5) | (phyreg & 0x1f); 125 udelay(25); 126 mace->eth.phy_trans_go = 1; 127 udelay(25); 128 WAIT_FOR_PHY(rval); 129 return rval & MDIO_DATA_MASK; 130 } 131 132 static int mdio_probe(struct meth_private *priv) 133 { 134 int i; 135 unsigned long p2, p3, flags; 136 /* check if phy is detected already */ 137 if(priv->phy_addr>=0&&priv->phy_addr<32) 138 return 0; 139 spin_lock_irqsave(&priv->meth_lock, flags); 140 for (i=0;i<32;++i){ 141 priv->phy_addr=i; 142 p2=mdio_read(priv,2); 143 p3=mdio_read(priv,3); 144 #if MFE_DEBUG>=2 145 switch ((p2<<12)|(p3>>4)){ 146 case PHY_QS6612X: 147 DPRINTK("PHY is QS6612X\n"); 148 break; 149 case PHY_ICS1889: 150 DPRINTK("PHY is ICS1889\n"); 151 break; 152 case PHY_ICS1890: 153 DPRINTK("PHY is ICS1890\n"); 154 break; 155 case PHY_DP83840: 156 DPRINTK("PHY is DP83840\n"); 157 break; 158 } 159 #endif 160 if(p2!=0xffff&&p2!=0x0000){ 161 DPRINTK("PHY code: %x\n",(p2<<12)|(p3>>4)); 162 break; 163 } 164 } 165 spin_unlock_irqrestore(&priv->meth_lock, flags); 166 if(priv->phy_addr<32) { 167 return 0; 168 } 169 DPRINTK("Oopsie! PHY is not known!\n"); 170 priv->phy_addr=-1; 171 return -ENODEV; 172 } 173 174 static void meth_check_link(struct net_device *dev) 175 { 176 struct meth_private *priv = netdev_priv(dev); 177 unsigned long mii_advertising = mdio_read(priv, 4); 178 unsigned long mii_partner = mdio_read(priv, 5); 179 unsigned long negotiated = mii_advertising & mii_partner; 180 unsigned long duplex, speed; 181 182 if (mii_partner == 0xffff) 183 return; 184 185 speed = (negotiated & 0x0380) ? METH_100MBIT : 0; 186 duplex = ((negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040) ? 187 METH_PHY_FDX : 0; 188 189 if ((priv->mac_ctrl & METH_PHY_FDX) ^ duplex) { 190 DPRINTK("Setting %s-duplex\n", duplex ? "full" : "half"); 191 if (duplex) 192 priv->mac_ctrl |= METH_PHY_FDX; 193 else 194 priv->mac_ctrl &= ~METH_PHY_FDX; 195 mace->eth.mac_ctrl = priv->mac_ctrl; 196 } 197 198 if ((priv->mac_ctrl & METH_100MBIT) ^ speed) { 199 DPRINTK("Setting %dMbs mode\n", speed ? 100 : 10); 200 if (duplex) 201 priv->mac_ctrl |= METH_100MBIT; 202 else 203 priv->mac_ctrl &= ~METH_100MBIT; 204 mace->eth.mac_ctrl = priv->mac_ctrl; 205 } 206 } 207 208 209 static int meth_init_tx_ring(struct meth_private *priv) 210 { 211 /* Init TX ring */ 212 priv->tx_ring = dma_alloc_coherent(&priv->pdev->dev, 213 TX_RING_BUFFER_SIZE, &priv->tx_ring_dma, GFP_ATOMIC); 214 if (!priv->tx_ring) 215 return -ENOMEM; 216 217 priv->tx_count = priv->tx_read = priv->tx_write = 0; 218 mace->eth.tx_ring_base = priv->tx_ring_dma; 219 /* Now init skb save area */ 220 memset(priv->tx_skbs, 0, sizeof(priv->tx_skbs)); 221 memset(priv->tx_skb_dmas, 0, sizeof(priv->tx_skb_dmas)); 222 return 0; 223 } 224 225 static int meth_init_rx_ring(struct meth_private *priv) 226 { 227 int i; 228 229 for (i = 0; i < RX_RING_ENTRIES; i++) { 230 priv->rx_skbs[i] = alloc_skb(METH_RX_BUFF_SIZE, 0); 231 /* 8byte status vector + 3quad padding + 2byte padding, 232 * to put data on 64bit aligned boundary */ 233 skb_reserve(priv->rx_skbs[i],METH_RX_HEAD); 234 priv->rx_ring[i]=(rx_packet*)(priv->rx_skbs[i]->head); 235 /* I'll need to re-sync it after each RX */ 236 priv->rx_ring_dmas[i] = 237 dma_map_single(&priv->pdev->dev, priv->rx_ring[i], 238 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE); 239 mace->eth.rx_fifo = priv->rx_ring_dmas[i]; 240 } 241 priv->rx_write = 0; 242 return 0; 243 } 244 static void meth_free_tx_ring(struct meth_private *priv) 245 { 246 int i; 247 248 /* Remove any pending skb */ 249 for (i = 0; i < TX_RING_ENTRIES; i++) { 250 dev_kfree_skb(priv->tx_skbs[i]); 251 priv->tx_skbs[i] = NULL; 252 } 253 dma_free_coherent(&priv->pdev->dev, TX_RING_BUFFER_SIZE, priv->tx_ring, 254 priv->tx_ring_dma); 255 } 256 257 /* Presumes RX DMA engine is stopped, and RX fifo ring is reset */ 258 static void meth_free_rx_ring(struct meth_private *priv) 259 { 260 int i; 261 262 for (i = 0; i < RX_RING_ENTRIES; i++) { 263 dma_unmap_single(&priv->pdev->dev, priv->rx_ring_dmas[i], 264 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE); 265 priv->rx_ring[i] = 0; 266 priv->rx_ring_dmas[i] = 0; 267 kfree_skb(priv->rx_skbs[i]); 268 } 269 } 270 271 int meth_reset(struct net_device *dev) 272 { 273 struct meth_private *priv = netdev_priv(dev); 274 275 /* Reset card */ 276 mace->eth.mac_ctrl = SGI_MAC_RESET; 277 udelay(1); 278 mace->eth.mac_ctrl = 0; 279 udelay(25); 280 281 /* Load ethernet address */ 282 load_eaddr(dev); 283 /* Should load some "errata", but later */ 284 285 /* Check for device */ 286 if (mdio_probe(priv) < 0) { 287 DPRINTK("Unable to find PHY\n"); 288 return -ENODEV; 289 } 290 291 /* Initial mode: 10 | Half-duplex | Accept normal packets */ 292 priv->mac_ctrl = METH_ACCEPT_MCAST | METH_DEFAULT_IPG; 293 if (dev->flags & IFF_PROMISC) 294 priv->mac_ctrl |= METH_PROMISC; 295 mace->eth.mac_ctrl = priv->mac_ctrl; 296 297 /* Autonegotiate speed and duplex mode */ 298 meth_check_link(dev); 299 300 /* Now set dma control, but don't enable DMA, yet */ 301 priv->dma_ctrl = (4 << METH_RX_OFFSET_SHIFT) | 302 (RX_RING_ENTRIES << METH_RX_DEPTH_SHIFT); 303 mace->eth.dma_ctrl = priv->dma_ctrl; 304 305 return 0; 306 } 307 308 /*============End Helper Routines=====================*/ 309 310 /* 311 * Open and close 312 */ 313 static int meth_open(struct net_device *dev) 314 { 315 struct meth_private *priv = netdev_priv(dev); 316 int ret; 317 318 priv->phy_addr = -1; /* No PHY is known yet... */ 319 320 /* Initialize the hardware */ 321 ret = meth_reset(dev); 322 if (ret < 0) 323 return ret; 324 325 /* Allocate the ring buffers */ 326 ret = meth_init_tx_ring(priv); 327 if (ret < 0) 328 return ret; 329 ret = meth_init_rx_ring(priv); 330 if (ret < 0) 331 goto out_free_tx_ring; 332 333 ret = request_irq(dev->irq, meth_interrupt, 0, meth_str, dev); 334 if (ret) { 335 printk(KERN_ERR "%s: Can't get irq %d\n", dev->name, dev->irq); 336 goto out_free_rx_ring; 337 } 338 339 /* Start DMA */ 340 priv->dma_ctrl |= METH_DMA_TX_EN | /*METH_DMA_TX_INT_EN |*/ 341 METH_DMA_RX_EN | METH_DMA_RX_INT_EN; 342 mace->eth.dma_ctrl = priv->dma_ctrl; 343 344 DPRINTK("About to start queue\n"); 345 netif_start_queue(dev); 346 347 return 0; 348 349 out_free_rx_ring: 350 meth_free_rx_ring(priv); 351 out_free_tx_ring: 352 meth_free_tx_ring(priv); 353 354 return ret; 355 } 356 357 static int meth_release(struct net_device *dev) 358 { 359 struct meth_private *priv = netdev_priv(dev); 360 361 DPRINTK("Stopping queue\n"); 362 netif_stop_queue(dev); /* can't transmit any more */ 363 /* shut down DMA */ 364 priv->dma_ctrl &= ~(METH_DMA_TX_EN | METH_DMA_TX_INT_EN | 365 METH_DMA_RX_EN | METH_DMA_RX_INT_EN); 366 mace->eth.dma_ctrl = priv->dma_ctrl; 367 free_irq(dev->irq, dev); 368 meth_free_tx_ring(priv); 369 meth_free_rx_ring(priv); 370 371 return 0; 372 } 373 374 /* 375 * Receive a packet: retrieve, encapsulate and pass over to upper levels 376 */ 377 static void meth_rx(struct net_device* dev, unsigned long int_status) 378 { 379 struct sk_buff *skb; 380 unsigned long status, flags; 381 struct meth_private *priv = netdev_priv(dev); 382 unsigned long fifo_rptr = (int_status & METH_INT_RX_RPTR_MASK) >> 8; 383 384 spin_lock_irqsave(&priv->meth_lock, flags); 385 priv->dma_ctrl &= ~METH_DMA_RX_INT_EN; 386 mace->eth.dma_ctrl = priv->dma_ctrl; 387 spin_unlock_irqrestore(&priv->meth_lock, flags); 388 389 if (int_status & METH_INT_RX_UNDERFLOW) { 390 fifo_rptr = (fifo_rptr - 1) & 0x0f; 391 } 392 while (priv->rx_write != fifo_rptr) { 393 dma_unmap_single(&priv->pdev->dev, 394 priv->rx_ring_dmas[priv->rx_write], 395 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE); 396 status = priv->rx_ring[priv->rx_write]->status.raw; 397 #if MFE_DEBUG 398 if (!(status & METH_RX_ST_VALID)) { 399 DPRINTK("Not received? status=%016lx\n",status); 400 } 401 #endif 402 if ((!(status & METH_RX_STATUS_ERRORS)) && (status & METH_RX_ST_VALID)) { 403 int len = (status & 0xffff) - 4; /* omit CRC */ 404 /* length sanity check */ 405 if (len < 60 || len > 1518) { 406 printk(KERN_DEBUG "%s: bogus packet size: %ld, status=%#2Lx.\n", 407 dev->name, priv->rx_write, 408 priv->rx_ring[priv->rx_write]->status.raw); 409 dev->stats.rx_errors++; 410 dev->stats.rx_length_errors++; 411 skb = priv->rx_skbs[priv->rx_write]; 412 } else { 413 skb = alloc_skb(METH_RX_BUFF_SIZE, GFP_ATOMIC); 414 if (!skb) { 415 /* Ouch! No memory! Drop packet on the floor */ 416 DPRINTK("No mem: dropping packet\n"); 417 dev->stats.rx_dropped++; 418 skb = priv->rx_skbs[priv->rx_write]; 419 } else { 420 struct sk_buff *skb_c = priv->rx_skbs[priv->rx_write]; 421 /* 8byte status vector + 3quad padding + 2byte padding, 422 * to put data on 64bit aligned boundary */ 423 skb_reserve(skb, METH_RX_HEAD); 424 /* Write metadata, and then pass to the receive level */ 425 skb_put(skb_c, len); 426 priv->rx_skbs[priv->rx_write] = skb; 427 skb_c->protocol = eth_type_trans(skb_c, dev); 428 dev->stats.rx_packets++; 429 dev->stats.rx_bytes += len; 430 netif_rx(skb_c); 431 } 432 } 433 } else { 434 dev->stats.rx_errors++; 435 skb=priv->rx_skbs[priv->rx_write]; 436 #if MFE_DEBUG>0 437 printk(KERN_WARNING "meth: RX error: status=0x%016lx\n",status); 438 if(status&METH_RX_ST_RCV_CODE_VIOLATION) 439 printk(KERN_WARNING "Receive Code Violation\n"); 440 if(status&METH_RX_ST_CRC_ERR) 441 printk(KERN_WARNING "CRC error\n"); 442 if(status&METH_RX_ST_INV_PREAMBLE_CTX) 443 printk(KERN_WARNING "Invalid Preamble Context\n"); 444 if(status&METH_RX_ST_LONG_EVT_SEEN) 445 printk(KERN_WARNING "Long Event Seen...\n"); 446 if(status&METH_RX_ST_BAD_PACKET) 447 printk(KERN_WARNING "Bad Packet\n"); 448 if(status&METH_RX_ST_CARRIER_EVT_SEEN) 449 printk(KERN_WARNING "Carrier Event Seen\n"); 450 #endif 451 } 452 priv->rx_ring[priv->rx_write] = (rx_packet*)skb->head; 453 priv->rx_ring[priv->rx_write]->status.raw = 0; 454 priv->rx_ring_dmas[priv->rx_write] = 455 dma_map_single(&priv->pdev->dev, 456 priv->rx_ring[priv->rx_write], 457 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE); 458 mace->eth.rx_fifo = priv->rx_ring_dmas[priv->rx_write]; 459 ADVANCE_RX_PTR(priv->rx_write); 460 } 461 spin_lock_irqsave(&priv->meth_lock, flags); 462 /* In case there was underflow, and Rx DMA was disabled */ 463 priv->dma_ctrl |= METH_DMA_RX_INT_EN | METH_DMA_RX_EN; 464 mace->eth.dma_ctrl = priv->dma_ctrl; 465 mace->eth.int_stat = METH_INT_RX_THRESHOLD; 466 spin_unlock_irqrestore(&priv->meth_lock, flags); 467 } 468 469 static int meth_tx_full(struct net_device *dev) 470 { 471 struct meth_private *priv = netdev_priv(dev); 472 473 return priv->tx_count >= TX_RING_ENTRIES - 1; 474 } 475 476 static void meth_tx_cleanup(struct net_device* dev, unsigned long int_status) 477 { 478 struct meth_private *priv = netdev_priv(dev); 479 unsigned long status, flags; 480 struct sk_buff *skb; 481 unsigned long rptr = (int_status&TX_INFO_RPTR) >> 16; 482 483 spin_lock_irqsave(&priv->meth_lock, flags); 484 485 /* Stop DMA notification */ 486 priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN); 487 mace->eth.dma_ctrl = priv->dma_ctrl; 488 489 while (priv->tx_read != rptr) { 490 skb = priv->tx_skbs[priv->tx_read]; 491 status = priv->tx_ring[priv->tx_read].header.raw; 492 #if MFE_DEBUG>=1 493 if (priv->tx_read == priv->tx_write) 494 DPRINTK("Auchi! tx_read=%d,tx_write=%d,rptr=%d?\n", priv->tx_read, priv->tx_write,rptr); 495 #endif 496 if (status & METH_TX_ST_DONE) { 497 if (status & METH_TX_ST_SUCCESS){ 498 dev->stats.tx_packets++; 499 dev->stats.tx_bytes += skb->len; 500 } else { 501 dev->stats.tx_errors++; 502 #if MFE_DEBUG>=1 503 DPRINTK("TX error: status=%016lx <",status); 504 if(status & METH_TX_ST_SUCCESS) 505 printk(" SUCCESS"); 506 if(status & METH_TX_ST_TOOLONG) 507 printk(" TOOLONG"); 508 if(status & METH_TX_ST_UNDERRUN) 509 printk(" UNDERRUN"); 510 if(status & METH_TX_ST_EXCCOLL) 511 printk(" EXCCOLL"); 512 if(status & METH_TX_ST_DEFER) 513 printk(" DEFER"); 514 if(status & METH_TX_ST_LATECOLL) 515 printk(" LATECOLL"); 516 printk(" >\n"); 517 #endif 518 } 519 } else { 520 DPRINTK("RPTR points us here, but packet not done?\n"); 521 break; 522 } 523 dev_consume_skb_irq(skb); 524 priv->tx_skbs[priv->tx_read] = NULL; 525 priv->tx_ring[priv->tx_read].header.raw = 0; 526 priv->tx_read = (priv->tx_read+1)&(TX_RING_ENTRIES-1); 527 priv->tx_count--; 528 } 529 530 /* wake up queue if it was stopped */ 531 if (netif_queue_stopped(dev) && !meth_tx_full(dev)) { 532 netif_wake_queue(dev); 533 } 534 535 mace->eth.int_stat = METH_INT_TX_EMPTY | METH_INT_TX_PKT; 536 spin_unlock_irqrestore(&priv->meth_lock, flags); 537 } 538 539 static void meth_error(struct net_device* dev, unsigned status) 540 { 541 struct meth_private *priv = netdev_priv(dev); 542 unsigned long flags; 543 544 printk(KERN_WARNING "meth: error status: 0x%08x\n",status); 545 /* check for errors too... */ 546 if (status & (METH_INT_TX_LINK_FAIL)) 547 printk(KERN_WARNING "meth: link failure\n"); 548 /* Should I do full reset in this case? */ 549 if (status & (METH_INT_MEM_ERROR)) 550 printk(KERN_WARNING "meth: memory error\n"); 551 if (status & (METH_INT_TX_ABORT)) 552 printk(KERN_WARNING "meth: aborted\n"); 553 if (status & (METH_INT_RX_OVERFLOW)) 554 printk(KERN_WARNING "meth: Rx overflow\n"); 555 if (status & (METH_INT_RX_UNDERFLOW)) { 556 printk(KERN_WARNING "meth: Rx underflow\n"); 557 spin_lock_irqsave(&priv->meth_lock, flags); 558 mace->eth.int_stat = METH_INT_RX_UNDERFLOW; 559 /* more underflow interrupts will be delivered, 560 * effectively throwing us into an infinite loop. 561 * Thus I stop processing Rx in this case. */ 562 priv->dma_ctrl &= ~METH_DMA_RX_EN; 563 mace->eth.dma_ctrl = priv->dma_ctrl; 564 DPRINTK("Disabled meth Rx DMA temporarily\n"); 565 spin_unlock_irqrestore(&priv->meth_lock, flags); 566 } 567 mace->eth.int_stat = METH_INT_ERROR; 568 } 569 570 /* 571 * The typical interrupt entry point 572 */ 573 static irqreturn_t meth_interrupt(int irq, void *dev_id) 574 { 575 struct net_device *dev = (struct net_device *)dev_id; 576 struct meth_private *priv = netdev_priv(dev); 577 unsigned long status; 578 579 status = mace->eth.int_stat; 580 while (status & 0xff) { 581 /* First handle errors - if we get Rx underflow, 582 * Rx DMA will be disabled, and Rx handler will reenable 583 * it. I don't think it's possible to get Rx underflow, 584 * without getting Rx interrupt */ 585 if (status & METH_INT_ERROR) { 586 meth_error(dev, status); 587 } 588 if (status & (METH_INT_TX_EMPTY | METH_INT_TX_PKT)) { 589 /* a transmission is over: free the skb */ 590 meth_tx_cleanup(dev, status); 591 } 592 if (status & METH_INT_RX_THRESHOLD) { 593 if (!(priv->dma_ctrl & METH_DMA_RX_INT_EN)) 594 break; 595 /* send it to meth_rx for handling */ 596 meth_rx(dev, status); 597 } 598 status = mace->eth.int_stat; 599 } 600 601 return IRQ_HANDLED; 602 } 603 604 /* 605 * Transmits packets that fit into TX descriptor (are <=120B) 606 */ 607 static void meth_tx_short_prepare(struct meth_private *priv, 608 struct sk_buff *skb) 609 { 610 tx_packet *desc = &priv->tx_ring[priv->tx_write]; 611 int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len; 612 613 desc->header.raw = METH_TX_CMD_INT_EN | (len-1) | ((128-len) << 16); 614 /* maybe I should set whole thing to 0 first... */ 615 skb_copy_from_linear_data(skb, desc->data.dt + (120 - len), skb->len); 616 if (skb->len < len) 617 memset(desc->data.dt + 120 - len + skb->len, 0, len-skb->len); 618 } 619 #define TX_CATBUF1 BIT(25) 620 static void meth_tx_1page_prepare(struct meth_private *priv, 621 struct sk_buff *skb) 622 { 623 tx_packet *desc = &priv->tx_ring[priv->tx_write]; 624 void *buffer_data = (void *)(((unsigned long)skb->data + 7) & ~7); 625 int unaligned_len = (int)((unsigned long)buffer_data - (unsigned long)skb->data); 626 int buffer_len = skb->len - unaligned_len; 627 dma_addr_t catbuf; 628 629 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | (skb->len - 1); 630 631 /* unaligned part */ 632 if (unaligned_len) { 633 skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len), 634 unaligned_len); 635 desc->header.raw |= (128 - unaligned_len) << 16; 636 } 637 638 /* first page */ 639 catbuf = dma_map_single(&priv->pdev->dev, buffer_data, buffer_len, 640 DMA_TO_DEVICE); 641 desc->data.cat_buf[0].form.start_addr = catbuf >> 3; 642 desc->data.cat_buf[0].form.len = buffer_len - 1; 643 } 644 #define TX_CATBUF2 BIT(26) 645 static void meth_tx_2page_prepare(struct meth_private *priv, 646 struct sk_buff *skb) 647 { 648 tx_packet *desc = &priv->tx_ring[priv->tx_write]; 649 void *buffer1_data = (void *)(((unsigned long)skb->data + 7) & ~7); 650 void *buffer2_data = (void *)PAGE_ALIGN((unsigned long)skb->data); 651 int unaligned_len = (int)((unsigned long)buffer1_data - (unsigned long)skb->data); 652 int buffer1_len = (int)((unsigned long)buffer2_data - (unsigned long)buffer1_data); 653 int buffer2_len = skb->len - buffer1_len - unaligned_len; 654 dma_addr_t catbuf1, catbuf2; 655 656 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | TX_CATBUF2| (skb->len - 1); 657 /* unaligned part */ 658 if (unaligned_len){ 659 skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len), 660 unaligned_len); 661 desc->header.raw |= (128 - unaligned_len) << 16; 662 } 663 664 /* first page */ 665 catbuf1 = dma_map_single(&priv->pdev->dev, buffer1_data, buffer1_len, 666 DMA_TO_DEVICE); 667 desc->data.cat_buf[0].form.start_addr = catbuf1 >> 3; 668 desc->data.cat_buf[0].form.len = buffer1_len - 1; 669 /* second page */ 670 catbuf2 = dma_map_single(&priv->pdev->dev, buffer2_data, buffer2_len, 671 DMA_TO_DEVICE); 672 desc->data.cat_buf[1].form.start_addr = catbuf2 >> 3; 673 desc->data.cat_buf[1].form.len = buffer2_len - 1; 674 } 675 676 static void meth_add_to_tx_ring(struct meth_private *priv, struct sk_buff *skb) 677 { 678 /* Remember the skb, so we can free it at interrupt time */ 679 priv->tx_skbs[priv->tx_write] = skb; 680 if (skb->len <= 120) { 681 /* Whole packet fits into descriptor */ 682 meth_tx_short_prepare(priv, skb); 683 } else if (PAGE_ALIGN((unsigned long)skb->data) != 684 PAGE_ALIGN((unsigned long)skb->data + skb->len - 1)) { 685 /* Packet crosses page boundary */ 686 meth_tx_2page_prepare(priv, skb); 687 } else { 688 /* Packet is in one page */ 689 meth_tx_1page_prepare(priv, skb); 690 } 691 priv->tx_write = (priv->tx_write + 1) & (TX_RING_ENTRIES - 1); 692 mace->eth.tx_info = priv->tx_write; 693 priv->tx_count++; 694 } 695 696 /* 697 * Transmit a packet (called by the kernel) 698 */ 699 static netdev_tx_t meth_tx(struct sk_buff *skb, struct net_device *dev) 700 { 701 struct meth_private *priv = netdev_priv(dev); 702 unsigned long flags; 703 704 spin_lock_irqsave(&priv->meth_lock, flags); 705 /* Stop DMA notification */ 706 priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN); 707 mace->eth.dma_ctrl = priv->dma_ctrl; 708 709 meth_add_to_tx_ring(priv, skb); 710 netif_trans_update(dev); /* save the timestamp */ 711 712 /* If TX ring is full, tell the upper layer to stop sending packets */ 713 if (meth_tx_full(dev)) { 714 printk(KERN_DEBUG "TX full: stopping\n"); 715 netif_stop_queue(dev); 716 } 717 718 /* Restart DMA notification */ 719 priv->dma_ctrl |= METH_DMA_TX_INT_EN; 720 mace->eth.dma_ctrl = priv->dma_ctrl; 721 722 spin_unlock_irqrestore(&priv->meth_lock, flags); 723 724 return NETDEV_TX_OK; 725 } 726 727 /* 728 * Deal with a transmit timeout. 729 */ 730 static void meth_tx_timeout(struct net_device *dev) 731 { 732 struct meth_private *priv = netdev_priv(dev); 733 unsigned long flags; 734 735 printk(KERN_WARNING "%s: transmit timed out\n", dev->name); 736 737 /* Protect against concurrent rx interrupts */ 738 spin_lock_irqsave(&priv->meth_lock,flags); 739 740 /* Try to reset the interface. */ 741 meth_reset(dev); 742 743 dev->stats.tx_errors++; 744 745 /* Clear all rings */ 746 meth_free_tx_ring(priv); 747 meth_free_rx_ring(priv); 748 meth_init_tx_ring(priv); 749 meth_init_rx_ring(priv); 750 751 /* Restart dma */ 752 priv->dma_ctrl |= METH_DMA_TX_EN | METH_DMA_RX_EN | METH_DMA_RX_INT_EN; 753 mace->eth.dma_ctrl = priv->dma_ctrl; 754 755 /* Enable interrupt */ 756 spin_unlock_irqrestore(&priv->meth_lock, flags); 757 758 netif_trans_update(dev); /* prevent tx timeout */ 759 netif_wake_queue(dev); 760 } 761 762 /* 763 * Ioctl commands 764 */ 765 static int meth_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 766 { 767 /* XXX Not yet implemented */ 768 switch(cmd) { 769 case SIOCGMIIPHY: 770 case SIOCGMIIREG: 771 case SIOCSMIIREG: 772 default: 773 return -EOPNOTSUPP; 774 } 775 } 776 777 static void meth_set_rx_mode(struct net_device *dev) 778 { 779 struct meth_private *priv = netdev_priv(dev); 780 unsigned long flags; 781 782 netif_stop_queue(dev); 783 spin_lock_irqsave(&priv->meth_lock, flags); 784 priv->mac_ctrl &= ~METH_PROMISC; 785 786 if (dev->flags & IFF_PROMISC) { 787 priv->mac_ctrl |= METH_PROMISC; 788 priv->mcast_filter = 0xffffffffffffffffUL; 789 } else if ((netdev_mc_count(dev) > METH_MCF_LIMIT) || 790 (dev->flags & IFF_ALLMULTI)) { 791 priv->mac_ctrl |= METH_ACCEPT_AMCAST; 792 priv->mcast_filter = 0xffffffffffffffffUL; 793 } else { 794 struct netdev_hw_addr *ha; 795 priv->mac_ctrl |= METH_ACCEPT_MCAST; 796 797 netdev_for_each_mc_addr(ha, dev) 798 set_bit((ether_crc(ETH_ALEN, ha->addr) >> 26), 799 (volatile unsigned long *)&priv->mcast_filter); 800 } 801 802 /* Write the changes to the chip registers. */ 803 mace->eth.mac_ctrl = priv->mac_ctrl; 804 mace->eth.mcast_filter = priv->mcast_filter; 805 806 /* Done! */ 807 spin_unlock_irqrestore(&priv->meth_lock, flags); 808 netif_wake_queue(dev); 809 } 810 811 static const struct net_device_ops meth_netdev_ops = { 812 .ndo_open = meth_open, 813 .ndo_stop = meth_release, 814 .ndo_start_xmit = meth_tx, 815 .ndo_do_ioctl = meth_ioctl, 816 .ndo_tx_timeout = meth_tx_timeout, 817 .ndo_validate_addr = eth_validate_addr, 818 .ndo_set_mac_address = eth_mac_addr, 819 .ndo_set_rx_mode = meth_set_rx_mode, 820 }; 821 822 /* 823 * The init function. 824 */ 825 static int meth_probe(struct platform_device *pdev) 826 { 827 struct net_device *dev; 828 struct meth_private *priv; 829 int err; 830 831 dev = alloc_etherdev(sizeof(struct meth_private)); 832 if (!dev) 833 return -ENOMEM; 834 835 dev->netdev_ops = &meth_netdev_ops; 836 dev->watchdog_timeo = timeout; 837 dev->irq = MACE_ETHERNET_IRQ; 838 dev->base_addr = (unsigned long)&mace->eth; 839 memcpy(dev->dev_addr, o2meth_eaddr, ETH_ALEN); 840 841 priv = netdev_priv(dev); 842 priv->pdev = pdev; 843 spin_lock_init(&priv->meth_lock); 844 SET_NETDEV_DEV(dev, &pdev->dev); 845 846 err = register_netdev(dev); 847 if (err) { 848 free_netdev(dev); 849 return err; 850 } 851 852 printk(KERN_INFO "%s: SGI MACE Ethernet rev. %d\n", 853 dev->name, (unsigned int)(mace->eth.mac_ctrl >> 29)); 854 return 0; 855 } 856 857 static int meth_remove(struct platform_device *pdev) 858 { 859 struct net_device *dev = platform_get_drvdata(pdev); 860 861 unregister_netdev(dev); 862 free_netdev(dev); 863 864 return 0; 865 } 866 867 static struct platform_driver meth_driver = { 868 .probe = meth_probe, 869 .remove = meth_remove, 870 .driver = { 871 .name = "meth", 872 } 873 }; 874 875 module_platform_driver(meth_driver); 876 877 MODULE_AUTHOR("Ilya Volynets <ilya@theIlya.com>"); 878 MODULE_DESCRIPTION("SGI O2 Builtin Fast Ethernet driver"); 879 MODULE_LICENSE("GPL"); 880 MODULE_ALIAS("platform:meth"); 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