1 /* 2 * Driver for the IDT RC32434 (Korina) on-chip ethernet controller. 3 * 4 * Copyright 2004 IDT Inc. (rischelp@idt.com) 5 * Copyright 2006 Felix Fietkau <nbd@openwrt.org> 6 * Copyright 2008 Florian Fainelli <florian@openwrt.org> 7 * Copyright 2017 Roman Yeryomin <roman@advem.lv> 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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 16 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 17 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 20 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 21 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * You should have received a copy of the GNU General Public License along 26 * with this program; if not, write to the Free Software Foundation, Inc., 27 * 675 Mass Ave, Cambridge, MA 02139, USA. 28 * 29 * Writing to a DMA status register: 30 * 31 * When writing to the status register, you should mask the bit you have 32 * been testing the status register with. Both Tx and Rx DMA registers 33 * should stick to this procedure. 34 */ 35 36 #include <linux/module.h> 37 #include <linux/kernel.h> 38 #include <linux/moduleparam.h> 39 #include <linux/sched.h> 40 #include <linux/ctype.h> 41 #include <linux/types.h> 42 #include <linux/interrupt.h> 43 #include <linux/ioport.h> 44 #include <linux/iopoll.h> 45 #include <linux/in.h> 46 #include <linux/of_device.h> 47 #include <linux/of_net.h> 48 #include <linux/slab.h> 49 #include <linux/string.h> 50 #include <linux/delay.h> 51 #include <linux/netdevice.h> 52 #include <linux/etherdevice.h> 53 #include <linux/skbuff.h> 54 #include <linux/errno.h> 55 #include <linux/platform_device.h> 56 #include <linux/mii.h> 57 #include <linux/ethtool.h> 58 #include <linux/crc32.h> 59 #include <linux/pgtable.h> 60 #include <linux/clk.h> 61 62 #define DRV_NAME "korina" 63 #define DRV_VERSION "0.20" 64 #define DRV_RELDATE "15Sep2017" 65 66 struct eth_regs { 67 u32 ethintfc; 68 u32 ethfifott; 69 u32 etharc; 70 u32 ethhash0; 71 u32 ethhash1; 72 u32 ethu0[4]; /* Reserved. */ 73 u32 ethpfs; 74 u32 ethmcp; 75 u32 eth_u1[10]; /* Reserved. */ 76 u32 ethspare; 77 u32 eth_u2[42]; /* Reserved. */ 78 u32 ethsal0; 79 u32 ethsah0; 80 u32 ethsal1; 81 u32 ethsah1; 82 u32 ethsal2; 83 u32 ethsah2; 84 u32 ethsal3; 85 u32 ethsah3; 86 u32 ethrbc; 87 u32 ethrpc; 88 u32 ethrupc; 89 u32 ethrfc; 90 u32 ethtbc; 91 u32 ethgpf; 92 u32 eth_u9[50]; /* Reserved. */ 93 u32 ethmac1; 94 u32 ethmac2; 95 u32 ethipgt; 96 u32 ethipgr; 97 u32 ethclrt; 98 u32 ethmaxf; 99 u32 eth_u10; /* Reserved. */ 100 u32 ethmtest; 101 u32 miimcfg; 102 u32 miimcmd; 103 u32 miimaddr; 104 u32 miimwtd; 105 u32 miimrdd; 106 u32 miimind; 107 u32 eth_u11; /* Reserved. */ 108 u32 eth_u12; /* Reserved. */ 109 u32 ethcfsa0; 110 u32 ethcfsa1; 111 u32 ethcfsa2; 112 }; 113 114 /* Ethernet interrupt registers */ 115 #define ETH_INT_FC_EN BIT(0) 116 #define ETH_INT_FC_ITS BIT(1) 117 #define ETH_INT_FC_RIP BIT(2) 118 #define ETH_INT_FC_JAM BIT(3) 119 #define ETH_INT_FC_OVR BIT(4) 120 #define ETH_INT_FC_UND BIT(5) 121 #define ETH_INT_FC_IOC 0x000000c0 122 123 /* Ethernet FIFO registers */ 124 #define ETH_FIFI_TT_TTH_BIT 0 125 #define ETH_FIFO_TT_TTH 0x0000007f 126 127 /* Ethernet ARC/multicast registers */ 128 #define ETH_ARC_PRO BIT(0) 129 #define ETH_ARC_AM BIT(1) 130 #define ETH_ARC_AFM BIT(2) 131 #define ETH_ARC_AB BIT(3) 132 133 /* Ethernet SAL registers */ 134 #define ETH_SAL_BYTE_5 0x000000ff 135 #define ETH_SAL_BYTE_4 0x0000ff00 136 #define ETH_SAL_BYTE_3 0x00ff0000 137 #define ETH_SAL_BYTE_2 0xff000000 138 139 /* Ethernet SAH registers */ 140 #define ETH_SAH_BYTE1 0x000000ff 141 #define ETH_SAH_BYTE0 0x0000ff00 142 143 /* Ethernet GPF register */ 144 #define ETH_GPF_PTV 0x0000ffff 145 146 /* Ethernet PFG register */ 147 #define ETH_PFS_PFD BIT(0) 148 149 /* Ethernet CFSA[0-3] registers */ 150 #define ETH_CFSA0_CFSA4 0x000000ff 151 #define ETH_CFSA0_CFSA5 0x0000ff00 152 #define ETH_CFSA1_CFSA2 0x000000ff 153 #define ETH_CFSA1_CFSA3 0x0000ff00 154 #define ETH_CFSA1_CFSA0 0x000000ff 155 #define ETH_CFSA1_CFSA1 0x0000ff00 156 157 /* Ethernet MAC1 registers */ 158 #define ETH_MAC1_RE BIT(0) 159 #define ETH_MAC1_PAF BIT(1) 160 #define ETH_MAC1_RFC BIT(2) 161 #define ETH_MAC1_TFC BIT(3) 162 #define ETH_MAC1_LB BIT(4) 163 #define ETH_MAC1_MR BIT(31) 164 165 /* Ethernet MAC2 registers */ 166 #define ETH_MAC2_FD BIT(0) 167 #define ETH_MAC2_FLC BIT(1) 168 #define ETH_MAC2_HFE BIT(2) 169 #define ETH_MAC2_DC BIT(3) 170 #define ETH_MAC2_CEN BIT(4) 171 #define ETH_MAC2_PE BIT(5) 172 #define ETH_MAC2_VPE BIT(6) 173 #define ETH_MAC2_APE BIT(7) 174 #define ETH_MAC2_PPE BIT(8) 175 #define ETH_MAC2_LPE BIT(9) 176 #define ETH_MAC2_NB BIT(12) 177 #define ETH_MAC2_BP BIT(13) 178 #define ETH_MAC2_ED BIT(14) 179 180 /* Ethernet IPGT register */ 181 #define ETH_IPGT 0x0000007f 182 183 /* Ethernet IPGR registers */ 184 #define ETH_IPGR_IPGR2 0x0000007f 185 #define ETH_IPGR_IPGR1 0x00007f00 186 187 /* Ethernet CLRT registers */ 188 #define ETH_CLRT_MAX_RET 0x0000000f 189 #define ETH_CLRT_COL_WIN 0x00003f00 190 191 /* Ethernet MAXF register */ 192 #define ETH_MAXF 0x0000ffff 193 194 /* Ethernet test registers */ 195 #define ETH_TEST_REG BIT(2) 196 #define ETH_MCP_DIV 0x000000ff 197 198 /* MII registers */ 199 #define ETH_MII_CFG_RSVD 0x0000000c 200 #define ETH_MII_CMD_RD BIT(0) 201 #define ETH_MII_CMD_SCN BIT(1) 202 #define ETH_MII_REG_ADDR 0x0000001f 203 #define ETH_MII_PHY_ADDR 0x00001f00 204 #define ETH_MII_WTD_DATA 0x0000ffff 205 #define ETH_MII_RDD_DATA 0x0000ffff 206 #define ETH_MII_IND_BSY BIT(0) 207 #define ETH_MII_IND_SCN BIT(1) 208 #define ETH_MII_IND_NV BIT(2) 209 210 /* Values for the DEVCS field of the Ethernet DMA Rx and Tx descriptors. */ 211 #define ETH_RX_FD BIT(0) 212 #define ETH_RX_LD BIT(1) 213 #define ETH_RX_ROK BIT(2) 214 #define ETH_RX_FM BIT(3) 215 #define ETH_RX_MP BIT(4) 216 #define ETH_RX_BP BIT(5) 217 #define ETH_RX_VLT BIT(6) 218 #define ETH_RX_CF BIT(7) 219 #define ETH_RX_OVR BIT(8) 220 #define ETH_RX_CRC BIT(9) 221 #define ETH_RX_CV BIT(10) 222 #define ETH_RX_DB BIT(11) 223 #define ETH_RX_LE BIT(12) 224 #define ETH_RX_LOR BIT(13) 225 #define ETH_RX_CES BIT(14) 226 #define ETH_RX_LEN_BIT 16 227 #define ETH_RX_LEN 0xffff0000 228 229 #define ETH_TX_FD BIT(0) 230 #define ETH_TX_LD BIT(1) 231 #define ETH_TX_OEN BIT(2) 232 #define ETH_TX_PEN BIT(3) 233 #define ETH_TX_CEN BIT(4) 234 #define ETH_TX_HEN BIT(5) 235 #define ETH_TX_TOK BIT(6) 236 #define ETH_TX_MP BIT(7) 237 #define ETH_TX_BP BIT(8) 238 #define ETH_TX_UND BIT(9) 239 #define ETH_TX_OF BIT(10) 240 #define ETH_TX_ED BIT(11) 241 #define ETH_TX_EC BIT(12) 242 #define ETH_TX_LC BIT(13) 243 #define ETH_TX_TD BIT(14) 244 #define ETH_TX_CRC BIT(15) 245 #define ETH_TX_LE BIT(16) 246 #define ETH_TX_CC 0x001E0000 247 248 /* DMA descriptor (in physical memory). */ 249 struct dma_desc { 250 u32 control; /* Control. use DMAD_* */ 251 u32 ca; /* Current Address. */ 252 u32 devcs; /* Device control and status. */ 253 u32 link; /* Next descriptor in chain. */ 254 }; 255 256 #define DMA_DESC_COUNT_BIT 0 257 #define DMA_DESC_COUNT_MSK 0x0003ffff 258 #define DMA_DESC_DS_BIT 20 259 #define DMA_DESC_DS_MSK 0x00300000 260 261 #define DMA_DESC_DEV_CMD_BIT 22 262 #define DMA_DESC_DEV_CMD_MSK 0x01c00000 263 264 /* DMA descriptors interrupts */ 265 #define DMA_DESC_COF BIT(25) /* Chain on finished */ 266 #define DMA_DESC_COD BIT(26) /* Chain on done */ 267 #define DMA_DESC_IOF BIT(27) /* Interrupt on finished */ 268 #define DMA_DESC_IOD BIT(28) /* Interrupt on done */ 269 #define DMA_DESC_TERM BIT(29) /* Terminated */ 270 #define DMA_DESC_DONE BIT(30) /* Done */ 271 #define DMA_DESC_FINI BIT(31) /* Finished */ 272 273 /* DMA register (within Internal Register Map). */ 274 struct dma_reg { 275 u32 dmac; /* Control. */ 276 u32 dmas; /* Status. */ 277 u32 dmasm; /* Mask. */ 278 u32 dmadptr; /* Descriptor pointer. */ 279 u32 dmandptr; /* Next descriptor pointer. */ 280 }; 281 282 /* DMA channels specific registers */ 283 #define DMA_CHAN_RUN_BIT BIT(0) 284 #define DMA_CHAN_DONE_BIT BIT(1) 285 #define DMA_CHAN_MODE_BIT BIT(2) 286 #define DMA_CHAN_MODE_MSK 0x0000000c 287 #define DMA_CHAN_MODE_AUTO 0 288 #define DMA_CHAN_MODE_BURST 1 289 #define DMA_CHAN_MODE_XFRT 2 290 #define DMA_CHAN_MODE_RSVD 3 291 #define DMA_CHAN_ACT_BIT BIT(4) 292 293 /* DMA status registers */ 294 #define DMA_STAT_FINI BIT(0) 295 #define DMA_STAT_DONE BIT(1) 296 #define DMA_STAT_CHAIN BIT(2) 297 #define DMA_STAT_ERR BIT(3) 298 #define DMA_STAT_HALT BIT(4) 299 300 #define STATION_ADDRESS_HIGH(dev) (((dev)->dev_addr[0] << 8) | \ 301 ((dev)->dev_addr[1])) 302 #define STATION_ADDRESS_LOW(dev) (((dev)->dev_addr[2] << 24) | \ 303 ((dev)->dev_addr[3] << 16) | \ 304 ((dev)->dev_addr[4] << 8) | \ 305 ((dev)->dev_addr[5])) 306 307 #define MII_CLOCK 1250000 /* no more than 2.5MHz */ 308 309 /* the following must be powers of two */ 310 #define KORINA_NUM_RDS 64 /* number of receive descriptors */ 311 #define KORINA_NUM_TDS 64 /* number of transmit descriptors */ 312 313 /* KORINA_RBSIZE is the hardware's default maximum receive 314 * frame size in bytes. Having this hardcoded means that there 315 * is no support for MTU sizes greater than 1500. */ 316 #define KORINA_RBSIZE 1536 /* size of one resource buffer = Ether MTU */ 317 #define KORINA_RDS_MASK (KORINA_NUM_RDS - 1) 318 #define KORINA_TDS_MASK (KORINA_NUM_TDS - 1) 319 #define RD_RING_SIZE (KORINA_NUM_RDS * sizeof(struct dma_desc)) 320 #define TD_RING_SIZE (KORINA_NUM_TDS * sizeof(struct dma_desc)) 321 322 #define TX_TIMEOUT (6000 * HZ / 1000) 323 324 enum chain_status { 325 desc_filled, 326 desc_is_empty 327 }; 328 329 #define DMA_COUNT(count) ((count) & DMA_DESC_COUNT_MSK) 330 #define IS_DMA_FINISHED(X) (((X) & (DMA_DESC_FINI)) != 0) 331 #define IS_DMA_DONE(X) (((X) & (DMA_DESC_DONE)) != 0) 332 #define RCVPKT_LENGTH(X) (((X) & ETH_RX_LEN) >> ETH_RX_LEN_BIT) 333 334 /* Information that need to be kept for each board. */ 335 struct korina_private { 336 struct eth_regs __iomem *eth_regs; 337 struct dma_reg __iomem *rx_dma_regs; 338 struct dma_reg __iomem *tx_dma_regs; 339 struct dma_desc *td_ring; /* transmit descriptor ring */ 340 struct dma_desc *rd_ring; /* receive descriptor ring */ 341 dma_addr_t td_dma; 342 dma_addr_t rd_dma; 343 344 struct sk_buff *tx_skb[KORINA_NUM_TDS]; 345 struct sk_buff *rx_skb[KORINA_NUM_RDS]; 346 347 dma_addr_t rx_skb_dma[KORINA_NUM_RDS]; 348 dma_addr_t tx_skb_dma[KORINA_NUM_TDS]; 349 350 int rx_next_done; 351 int rx_chain_head; 352 int rx_chain_tail; 353 enum chain_status rx_chain_status; 354 355 int tx_next_done; 356 int tx_chain_head; 357 int tx_chain_tail; 358 enum chain_status tx_chain_status; 359 int tx_count; 360 int tx_full; 361 362 int rx_irq; 363 int tx_irq; 364 365 spinlock_t lock; /* NIC xmit lock */ 366 367 int dma_halt_cnt; 368 int dma_run_cnt; 369 struct napi_struct napi; 370 struct timer_list media_check_timer; 371 struct mii_if_info mii_if; 372 struct work_struct restart_task; 373 struct net_device *dev; 374 struct device *dmadev; 375 int mii_clock_freq; 376 }; 377 378 static dma_addr_t korina_tx_dma(struct korina_private *lp, int idx) 379 { 380 return lp->td_dma + (idx * sizeof(struct dma_desc)); 381 } 382 383 static dma_addr_t korina_rx_dma(struct korina_private *lp, int idx) 384 { 385 return lp->rd_dma + (idx * sizeof(struct dma_desc)); 386 } 387 388 static inline void korina_abort_dma(struct net_device *dev, 389 struct dma_reg *ch) 390 { 391 if (readl(&ch->dmac) & DMA_CHAN_RUN_BIT) { 392 writel(0x10, &ch->dmac); 393 394 while (!(readl(&ch->dmas) & DMA_STAT_HALT)) 395 netif_trans_update(dev); 396 397 writel(0, &ch->dmas); 398 } 399 400 writel(0, &ch->dmadptr); 401 writel(0, &ch->dmandptr); 402 } 403 404 static void korina_abort_tx(struct net_device *dev) 405 { 406 struct korina_private *lp = netdev_priv(dev); 407 408 korina_abort_dma(dev, lp->tx_dma_regs); 409 } 410 411 static void korina_abort_rx(struct net_device *dev) 412 { 413 struct korina_private *lp = netdev_priv(dev); 414 415 korina_abort_dma(dev, lp->rx_dma_regs); 416 } 417 418 /* transmit packet */ 419 static int korina_send_packet(struct sk_buff *skb, struct net_device *dev) 420 { 421 struct korina_private *lp = netdev_priv(dev); 422 u32 chain_prev, chain_next; 423 unsigned long flags; 424 struct dma_desc *td; 425 dma_addr_t ca; 426 u32 length; 427 int idx; 428 429 spin_lock_irqsave(&lp->lock, flags); 430 431 idx = lp->tx_chain_tail; 432 td = &lp->td_ring[idx]; 433 434 /* stop queue when full, drop pkts if queue already full */ 435 if (lp->tx_count >= (KORINA_NUM_TDS - 2)) { 436 lp->tx_full = 1; 437 438 if (lp->tx_count == (KORINA_NUM_TDS - 2)) 439 netif_stop_queue(dev); 440 else 441 goto drop_packet; 442 } 443 444 lp->tx_count++; 445 446 lp->tx_skb[idx] = skb; 447 448 length = skb->len; 449 450 /* Setup the transmit descriptor. */ 451 ca = dma_map_single(lp->dmadev, skb->data, length, DMA_TO_DEVICE); 452 if (dma_mapping_error(lp->dmadev, ca)) 453 goto drop_packet; 454 455 lp->tx_skb_dma[idx] = ca; 456 td->ca = ca; 457 458 chain_prev = (idx - 1) & KORINA_TDS_MASK; 459 chain_next = (idx + 1) & KORINA_TDS_MASK; 460 461 if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) { 462 if (lp->tx_chain_status == desc_is_empty) { 463 /* Update tail */ 464 td->control = DMA_COUNT(length) | 465 DMA_DESC_COF | DMA_DESC_IOF; 466 /* Move tail */ 467 lp->tx_chain_tail = chain_next; 468 /* Write to NDPTR */ 469 writel(korina_tx_dma(lp, lp->tx_chain_head), 470 &lp->tx_dma_regs->dmandptr); 471 /* Move head to tail */ 472 lp->tx_chain_head = lp->tx_chain_tail; 473 } else { 474 /* Update tail */ 475 td->control = DMA_COUNT(length) | 476 DMA_DESC_COF | DMA_DESC_IOF; 477 /* Link to prev */ 478 lp->td_ring[chain_prev].control &= 479 ~DMA_DESC_COF; 480 /* Link to prev */ 481 lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx); 482 /* Move tail */ 483 lp->tx_chain_tail = chain_next; 484 /* Write to NDPTR */ 485 writel(korina_tx_dma(lp, lp->tx_chain_head), 486 &lp->tx_dma_regs->dmandptr); 487 /* Move head to tail */ 488 lp->tx_chain_head = lp->tx_chain_tail; 489 lp->tx_chain_status = desc_is_empty; 490 } 491 } else { 492 if (lp->tx_chain_status == desc_is_empty) { 493 /* Update tail */ 494 td->control = DMA_COUNT(length) | 495 DMA_DESC_COF | DMA_DESC_IOF; 496 /* Move tail */ 497 lp->tx_chain_tail = chain_next; 498 lp->tx_chain_status = desc_filled; 499 } else { 500 /* Update tail */ 501 td->control = DMA_COUNT(length) | 502 DMA_DESC_COF | DMA_DESC_IOF; 503 lp->td_ring[chain_prev].control &= 504 ~DMA_DESC_COF; 505 lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx); 506 lp->tx_chain_tail = chain_next; 507 } 508 } 509 510 netif_trans_update(dev); 511 spin_unlock_irqrestore(&lp->lock, flags); 512 513 return NETDEV_TX_OK; 514 515 drop_packet: 516 dev->stats.tx_dropped++; 517 dev_kfree_skb_any(skb); 518 spin_unlock_irqrestore(&lp->lock, flags); 519 520 return NETDEV_TX_OK; 521 } 522 523 static int korina_mdio_wait(struct korina_private *lp) 524 { 525 u32 value; 526 527 return readl_poll_timeout_atomic(&lp->eth_regs->miimind, 528 value, value & ETH_MII_IND_BSY, 529 1, 1000); 530 } 531 532 static int korina_mdio_read(struct net_device *dev, int phy, int reg) 533 { 534 struct korina_private *lp = netdev_priv(dev); 535 int ret; 536 537 ret = korina_mdio_wait(lp); 538 if (ret < 0) 539 return ret; 540 541 writel(phy << 8 | reg, &lp->eth_regs->miimaddr); 542 writel(1, &lp->eth_regs->miimcmd); 543 544 ret = korina_mdio_wait(lp); 545 if (ret < 0) 546 return ret; 547 548 if (readl(&lp->eth_regs->miimind) & ETH_MII_IND_NV) 549 return -EINVAL; 550 551 ret = readl(&lp->eth_regs->miimrdd); 552 writel(0, &lp->eth_regs->miimcmd); 553 return ret; 554 } 555 556 static void korina_mdio_write(struct net_device *dev, int phy, int reg, int val) 557 { 558 struct korina_private *lp = netdev_priv(dev); 559 560 if (korina_mdio_wait(lp)) 561 return; 562 563 writel(0, &lp->eth_regs->miimcmd); 564 writel(phy << 8 | reg, &lp->eth_regs->miimaddr); 565 writel(val, &lp->eth_regs->miimwtd); 566 } 567 568 /* Ethernet Rx DMA interrupt */ 569 static irqreturn_t korina_rx_dma_interrupt(int irq, void *dev_id) 570 { 571 struct net_device *dev = dev_id; 572 struct korina_private *lp = netdev_priv(dev); 573 u32 dmas, dmasm; 574 irqreturn_t retval; 575 576 dmas = readl(&lp->rx_dma_regs->dmas); 577 if (dmas & (DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR)) { 578 dmasm = readl(&lp->rx_dma_regs->dmasm); 579 writel(dmasm | (DMA_STAT_DONE | 580 DMA_STAT_HALT | DMA_STAT_ERR), 581 &lp->rx_dma_regs->dmasm); 582 583 napi_schedule(&lp->napi); 584 585 if (dmas & DMA_STAT_ERR) 586 printk(KERN_ERR "%s: DMA error\n", dev->name); 587 588 retval = IRQ_HANDLED; 589 } else 590 retval = IRQ_NONE; 591 592 return retval; 593 } 594 595 static int korina_rx(struct net_device *dev, int limit) 596 { 597 struct korina_private *lp = netdev_priv(dev); 598 struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done]; 599 struct sk_buff *skb, *skb_new; 600 u32 devcs, pkt_len, dmas; 601 dma_addr_t ca; 602 int count; 603 604 for (count = 0; count < limit; count++) { 605 skb = lp->rx_skb[lp->rx_next_done]; 606 skb_new = NULL; 607 608 devcs = rd->devcs; 609 610 if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0) 611 break; 612 613 /* check that this is a whole packet 614 * WARNING: DMA_FD bit incorrectly set 615 * in Rc32434 (errata ref #077) */ 616 if (!(devcs & ETH_RX_LD)) 617 goto next; 618 619 if (!(devcs & ETH_RX_ROK)) { 620 /* Update statistics counters */ 621 dev->stats.rx_errors++; 622 dev->stats.rx_dropped++; 623 if (devcs & ETH_RX_CRC) 624 dev->stats.rx_crc_errors++; 625 if (devcs & ETH_RX_LE) 626 dev->stats.rx_length_errors++; 627 if (devcs & ETH_RX_OVR) 628 dev->stats.rx_fifo_errors++; 629 if (devcs & ETH_RX_CV) 630 dev->stats.rx_frame_errors++; 631 if (devcs & ETH_RX_CES) 632 dev->stats.rx_frame_errors++; 633 634 goto next; 635 } 636 637 /* Malloc up new buffer. */ 638 skb_new = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE); 639 if (!skb_new) 640 break; 641 642 ca = dma_map_single(lp->dmadev, skb_new->data, KORINA_RBSIZE, 643 DMA_FROM_DEVICE); 644 if (dma_mapping_error(lp->dmadev, ca)) { 645 dev_kfree_skb_any(skb_new); 646 break; 647 } 648 649 pkt_len = RCVPKT_LENGTH(devcs); 650 dma_unmap_single(lp->dmadev, lp->rx_skb_dma[lp->rx_next_done], 651 pkt_len, DMA_FROM_DEVICE); 652 653 /* Do not count the CRC */ 654 skb_put(skb, pkt_len - 4); 655 skb->protocol = eth_type_trans(skb, dev); 656 657 /* Pass the packet to upper layers */ 658 napi_gro_receive(&lp->napi, skb); 659 dev->stats.rx_packets++; 660 dev->stats.rx_bytes += pkt_len; 661 662 /* Update the mcast stats */ 663 if (devcs & ETH_RX_MP) 664 dev->stats.multicast++; 665 666 lp->rx_skb[lp->rx_next_done] = skb_new; 667 lp->rx_skb_dma[lp->rx_next_done] = ca; 668 669 next: 670 rd->devcs = 0; 671 672 /* Restore descriptor's curr_addr */ 673 rd->ca = lp->rx_skb_dma[lp->rx_next_done]; 674 675 rd->control = DMA_COUNT(KORINA_RBSIZE) | 676 DMA_DESC_COD | DMA_DESC_IOD; 677 lp->rd_ring[(lp->rx_next_done - 1) & 678 KORINA_RDS_MASK].control &= 679 ~DMA_DESC_COD; 680 681 lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK; 682 rd = &lp->rd_ring[lp->rx_next_done]; 683 writel((u32)~DMA_STAT_DONE, &lp->rx_dma_regs->dmas); 684 } 685 686 dmas = readl(&lp->rx_dma_regs->dmas); 687 688 if (dmas & DMA_STAT_HALT) { 689 writel((u32)~(DMA_STAT_HALT | DMA_STAT_ERR), 690 &lp->rx_dma_regs->dmas); 691 692 lp->dma_halt_cnt++; 693 rd->devcs = 0; 694 rd->ca = lp->rx_skb_dma[lp->rx_next_done]; 695 writel(korina_rx_dma(lp, rd - lp->rd_ring), 696 &lp->rx_dma_regs->dmandptr); 697 } 698 699 return count; 700 } 701 702 static int korina_poll(struct napi_struct *napi, int budget) 703 { 704 struct korina_private *lp = 705 container_of(napi, struct korina_private, napi); 706 struct net_device *dev = lp->dev; 707 int work_done; 708 709 work_done = korina_rx(dev, budget); 710 if (work_done < budget) { 711 napi_complete_done(napi, work_done); 712 713 writel(readl(&lp->rx_dma_regs->dmasm) & 714 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR), 715 &lp->rx_dma_regs->dmasm); 716 } 717 return work_done; 718 } 719 720 /* 721 * Set or clear the multicast filter for this adaptor. 722 */ 723 static void korina_multicast_list(struct net_device *dev) 724 { 725 struct korina_private *lp = netdev_priv(dev); 726 unsigned long flags; 727 struct netdev_hw_addr *ha; 728 u32 recognise = ETH_ARC_AB; /* always accept broadcasts */ 729 730 /* Set promiscuous mode */ 731 if (dev->flags & IFF_PROMISC) 732 recognise |= ETH_ARC_PRO; 733 734 else if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 4)) 735 /* All multicast and broadcast */ 736 recognise |= ETH_ARC_AM; 737 738 /* Build the hash table */ 739 if (netdev_mc_count(dev) > 4) { 740 u16 hash_table[4] = { 0 }; 741 u32 crc; 742 743 netdev_for_each_mc_addr(ha, dev) { 744 crc = ether_crc_le(6, ha->addr); 745 crc >>= 26; 746 hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf)); 747 } 748 /* Accept filtered multicast */ 749 recognise |= ETH_ARC_AFM; 750 751 /* Fill the MAC hash tables with their values */ 752 writel((u32)(hash_table[1] << 16 | hash_table[0]), 753 &lp->eth_regs->ethhash0); 754 writel((u32)(hash_table[3] << 16 | hash_table[2]), 755 &lp->eth_regs->ethhash1); 756 } 757 758 spin_lock_irqsave(&lp->lock, flags); 759 writel(recognise, &lp->eth_regs->etharc); 760 spin_unlock_irqrestore(&lp->lock, flags); 761 } 762 763 static void korina_tx(struct net_device *dev) 764 { 765 struct korina_private *lp = netdev_priv(dev); 766 struct dma_desc *td = &lp->td_ring[lp->tx_next_done]; 767 u32 devcs; 768 u32 dmas; 769 770 spin_lock(&lp->lock); 771 772 /* Process all desc that are done */ 773 while (IS_DMA_FINISHED(td->control)) { 774 if (lp->tx_full == 1) { 775 netif_wake_queue(dev); 776 lp->tx_full = 0; 777 } 778 779 devcs = lp->td_ring[lp->tx_next_done].devcs; 780 if ((devcs & (ETH_TX_FD | ETH_TX_LD)) != 781 (ETH_TX_FD | ETH_TX_LD)) { 782 dev->stats.tx_errors++; 783 dev->stats.tx_dropped++; 784 785 /* Should never happen */ 786 printk(KERN_ERR "%s: split tx ignored\n", 787 dev->name); 788 } else if (devcs & ETH_TX_TOK) { 789 dev->stats.tx_packets++; 790 dev->stats.tx_bytes += 791 lp->tx_skb[lp->tx_next_done]->len; 792 } else { 793 dev->stats.tx_errors++; 794 dev->stats.tx_dropped++; 795 796 /* Underflow */ 797 if (devcs & ETH_TX_UND) 798 dev->stats.tx_fifo_errors++; 799 800 /* Oversized frame */ 801 if (devcs & ETH_TX_OF) 802 dev->stats.tx_aborted_errors++; 803 804 /* Excessive deferrals */ 805 if (devcs & ETH_TX_ED) 806 dev->stats.tx_carrier_errors++; 807 808 /* Collisions: medium busy */ 809 if (devcs & ETH_TX_EC) 810 dev->stats.collisions++; 811 812 /* Late collision */ 813 if (devcs & ETH_TX_LC) 814 dev->stats.tx_window_errors++; 815 } 816 817 /* We must always free the original skb */ 818 if (lp->tx_skb[lp->tx_next_done]) { 819 dma_unmap_single(lp->dmadev, 820 lp->tx_skb_dma[lp->tx_next_done], 821 lp->tx_skb[lp->tx_next_done]->len, 822 DMA_TO_DEVICE); 823 dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]); 824 lp->tx_skb[lp->tx_next_done] = NULL; 825 } 826 827 lp->td_ring[lp->tx_next_done].control = DMA_DESC_IOF; 828 lp->td_ring[lp->tx_next_done].devcs = ETH_TX_FD | ETH_TX_LD; 829 lp->td_ring[lp->tx_next_done].link = 0; 830 lp->td_ring[lp->tx_next_done].ca = 0; 831 lp->tx_count--; 832 833 /* Go on to next transmission */ 834 lp->tx_next_done = (lp->tx_next_done + 1) & KORINA_TDS_MASK; 835 td = &lp->td_ring[lp->tx_next_done]; 836 837 } 838 839 /* Clear the DMA status register */ 840 dmas = readl(&lp->tx_dma_regs->dmas); 841 writel(~dmas, &lp->tx_dma_regs->dmas); 842 843 writel(readl(&lp->tx_dma_regs->dmasm) & 844 ~(DMA_STAT_FINI | DMA_STAT_ERR), 845 &lp->tx_dma_regs->dmasm); 846 847 spin_unlock(&lp->lock); 848 } 849 850 static irqreturn_t 851 korina_tx_dma_interrupt(int irq, void *dev_id) 852 { 853 struct net_device *dev = dev_id; 854 struct korina_private *lp = netdev_priv(dev); 855 u32 dmas, dmasm; 856 irqreturn_t retval; 857 858 dmas = readl(&lp->tx_dma_regs->dmas); 859 860 if (dmas & (DMA_STAT_FINI | DMA_STAT_ERR)) { 861 dmasm = readl(&lp->tx_dma_regs->dmasm); 862 writel(dmasm | (DMA_STAT_FINI | DMA_STAT_ERR), 863 &lp->tx_dma_regs->dmasm); 864 865 korina_tx(dev); 866 867 if (lp->tx_chain_status == desc_filled && 868 (readl(&(lp->tx_dma_regs->dmandptr)) == 0)) { 869 writel(korina_tx_dma(lp, lp->tx_chain_head), 870 &lp->tx_dma_regs->dmandptr); 871 lp->tx_chain_status = desc_is_empty; 872 lp->tx_chain_head = lp->tx_chain_tail; 873 netif_trans_update(dev); 874 } 875 if (dmas & DMA_STAT_ERR) 876 printk(KERN_ERR "%s: DMA error\n", dev->name); 877 878 retval = IRQ_HANDLED; 879 } else 880 retval = IRQ_NONE; 881 882 return retval; 883 } 884 885 886 static void korina_check_media(struct net_device *dev, unsigned int init_media) 887 { 888 struct korina_private *lp = netdev_priv(dev); 889 890 mii_check_media(&lp->mii_if, 1, init_media); 891 892 if (lp->mii_if.full_duplex) 893 writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD, 894 &lp->eth_regs->ethmac2); 895 else 896 writel(readl(&lp->eth_regs->ethmac2) & ~ETH_MAC2_FD, 897 &lp->eth_regs->ethmac2); 898 } 899 900 static void korina_poll_media(struct timer_list *t) 901 { 902 struct korina_private *lp = from_timer(lp, t, media_check_timer); 903 struct net_device *dev = lp->dev; 904 905 korina_check_media(dev, 0); 906 mod_timer(&lp->media_check_timer, jiffies + HZ); 907 } 908 909 static void korina_set_carrier(struct mii_if_info *mii) 910 { 911 if (mii->force_media) { 912 /* autoneg is off: Link is always assumed to be up */ 913 if (!netif_carrier_ok(mii->dev)) 914 netif_carrier_on(mii->dev); 915 } else /* Let MMI library update carrier status */ 916 korina_check_media(mii->dev, 0); 917 } 918 919 static int korina_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 920 { 921 struct korina_private *lp = netdev_priv(dev); 922 struct mii_ioctl_data *data = if_mii(rq); 923 int rc; 924 925 if (!netif_running(dev)) 926 return -EINVAL; 927 spin_lock_irq(&lp->lock); 928 rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL); 929 spin_unlock_irq(&lp->lock); 930 korina_set_carrier(&lp->mii_if); 931 932 return rc; 933 } 934 935 /* ethtool helpers */ 936 static void netdev_get_drvinfo(struct net_device *dev, 937 struct ethtool_drvinfo *info) 938 { 939 struct korina_private *lp = netdev_priv(dev); 940 941 strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); 942 strlcpy(info->version, DRV_VERSION, sizeof(info->version)); 943 strlcpy(info->bus_info, lp->dev->name, sizeof(info->bus_info)); 944 } 945 946 static int netdev_get_link_ksettings(struct net_device *dev, 947 struct ethtool_link_ksettings *cmd) 948 { 949 struct korina_private *lp = netdev_priv(dev); 950 951 spin_lock_irq(&lp->lock); 952 mii_ethtool_get_link_ksettings(&lp->mii_if, cmd); 953 spin_unlock_irq(&lp->lock); 954 955 return 0; 956 } 957 958 static int netdev_set_link_ksettings(struct net_device *dev, 959 const struct ethtool_link_ksettings *cmd) 960 { 961 struct korina_private *lp = netdev_priv(dev); 962 int rc; 963 964 spin_lock_irq(&lp->lock); 965 rc = mii_ethtool_set_link_ksettings(&lp->mii_if, cmd); 966 spin_unlock_irq(&lp->lock); 967 korina_set_carrier(&lp->mii_if); 968 969 return rc; 970 } 971 972 static u32 netdev_get_link(struct net_device *dev) 973 { 974 struct korina_private *lp = netdev_priv(dev); 975 976 return mii_link_ok(&lp->mii_if); 977 } 978 979 static const struct ethtool_ops netdev_ethtool_ops = { 980 .get_drvinfo = netdev_get_drvinfo, 981 .get_link = netdev_get_link, 982 .get_link_ksettings = netdev_get_link_ksettings, 983 .set_link_ksettings = netdev_set_link_ksettings, 984 }; 985 986 static int korina_alloc_ring(struct net_device *dev) 987 { 988 struct korina_private *lp = netdev_priv(dev); 989 struct sk_buff *skb; 990 dma_addr_t ca; 991 int i; 992 993 /* Initialize the transmit descriptors */ 994 for (i = 0; i < KORINA_NUM_TDS; i++) { 995 lp->td_ring[i].control = DMA_DESC_IOF; 996 lp->td_ring[i].devcs = ETH_TX_FD | ETH_TX_LD; 997 lp->td_ring[i].ca = 0; 998 lp->td_ring[i].link = 0; 999 } 1000 lp->tx_next_done = lp->tx_chain_head = lp->tx_chain_tail = 1001 lp->tx_full = lp->tx_count = 0; 1002 lp->tx_chain_status = desc_is_empty; 1003 1004 /* Initialize the receive descriptors */ 1005 for (i = 0; i < KORINA_NUM_RDS; i++) { 1006 skb = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE); 1007 if (!skb) 1008 return -ENOMEM; 1009 lp->rx_skb[i] = skb; 1010 lp->rd_ring[i].control = DMA_DESC_IOD | 1011 DMA_COUNT(KORINA_RBSIZE); 1012 lp->rd_ring[i].devcs = 0; 1013 ca = dma_map_single(lp->dmadev, skb->data, KORINA_RBSIZE, 1014 DMA_FROM_DEVICE); 1015 if (dma_mapping_error(lp->dmadev, ca)) 1016 return -ENOMEM; 1017 lp->rd_ring[i].ca = ca; 1018 lp->rx_skb_dma[i] = ca; 1019 lp->rd_ring[i].link = korina_rx_dma(lp, i + 1); 1020 } 1021 1022 /* loop back receive descriptors, so the last 1023 * descriptor points to the first one */ 1024 lp->rd_ring[i - 1].link = lp->rd_dma; 1025 lp->rd_ring[i - 1].control |= DMA_DESC_COD; 1026 1027 lp->rx_next_done = 0; 1028 lp->rx_chain_head = 0; 1029 lp->rx_chain_tail = 0; 1030 lp->rx_chain_status = desc_is_empty; 1031 1032 return 0; 1033 } 1034 1035 static void korina_free_ring(struct net_device *dev) 1036 { 1037 struct korina_private *lp = netdev_priv(dev); 1038 int i; 1039 1040 for (i = 0; i < KORINA_NUM_RDS; i++) { 1041 lp->rd_ring[i].control = 0; 1042 if (lp->rx_skb[i]) { 1043 dma_unmap_single(lp->dmadev, lp->rx_skb_dma[i], 1044 KORINA_RBSIZE, DMA_FROM_DEVICE); 1045 dev_kfree_skb_any(lp->rx_skb[i]); 1046 lp->rx_skb[i] = NULL; 1047 } 1048 } 1049 1050 for (i = 0; i < KORINA_NUM_TDS; i++) { 1051 lp->td_ring[i].control = 0; 1052 if (lp->tx_skb[i]) { 1053 dma_unmap_single(lp->dmadev, lp->tx_skb_dma[i], 1054 lp->tx_skb[i]->len, DMA_TO_DEVICE); 1055 dev_kfree_skb_any(lp->tx_skb[i]); 1056 lp->tx_skb[i] = NULL; 1057 } 1058 } 1059 } 1060 1061 /* 1062 * Initialize the RC32434 ethernet controller. 1063 */ 1064 static int korina_init(struct net_device *dev) 1065 { 1066 struct korina_private *lp = netdev_priv(dev); 1067 1068 /* Disable DMA */ 1069 korina_abort_tx(dev); 1070 korina_abort_rx(dev); 1071 1072 /* reset ethernet logic */ 1073 writel(0, &lp->eth_regs->ethintfc); 1074 while ((readl(&lp->eth_regs->ethintfc) & ETH_INT_FC_RIP)) 1075 netif_trans_update(dev); 1076 1077 /* Enable Ethernet Interface */ 1078 writel(ETH_INT_FC_EN, &lp->eth_regs->ethintfc); 1079 1080 /* Allocate rings */ 1081 if (korina_alloc_ring(dev)) { 1082 printk(KERN_ERR "%s: descriptor allocation failed\n", dev->name); 1083 korina_free_ring(dev); 1084 return -ENOMEM; 1085 } 1086 1087 writel(0, &lp->rx_dma_regs->dmas); 1088 /* Start Rx DMA */ 1089 writel(0, &lp->rx_dma_regs->dmandptr); 1090 writel(korina_rx_dma(lp, 0), &lp->rx_dma_regs->dmadptr); 1091 1092 writel(readl(&lp->tx_dma_regs->dmasm) & 1093 ~(DMA_STAT_FINI | DMA_STAT_ERR), 1094 &lp->tx_dma_regs->dmasm); 1095 writel(readl(&lp->rx_dma_regs->dmasm) & 1096 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR), 1097 &lp->rx_dma_regs->dmasm); 1098 1099 /* Accept only packets destined for this Ethernet device address */ 1100 writel(ETH_ARC_AB, &lp->eth_regs->etharc); 1101 1102 /* Set all Ether station address registers to their initial values */ 1103 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal0); 1104 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah0); 1105 1106 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal1); 1107 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah1); 1108 1109 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal2); 1110 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah2); 1111 1112 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal3); 1113 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah3); 1114 1115 1116 /* Frame Length Checking, Pad Enable, CRC Enable, Full Duplex set */ 1117 writel(ETH_MAC2_PE | ETH_MAC2_CEN | ETH_MAC2_FD, 1118 &lp->eth_regs->ethmac2); 1119 1120 /* Back to back inter-packet-gap */ 1121 writel(0x15, &lp->eth_regs->ethipgt); 1122 /* Non - Back to back inter-packet-gap */ 1123 writel(0x12, &lp->eth_regs->ethipgr); 1124 1125 /* Management Clock Prescaler Divisor 1126 * Clock independent setting */ 1127 writel(((lp->mii_clock_freq) / MII_CLOCK + 1) & ~1, 1128 &lp->eth_regs->ethmcp); 1129 writel(0, &lp->eth_regs->miimcfg); 1130 1131 /* don't transmit until fifo contains 48b */ 1132 writel(48, &lp->eth_regs->ethfifott); 1133 1134 writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1); 1135 1136 korina_check_media(dev, 1); 1137 1138 napi_enable(&lp->napi); 1139 netif_start_queue(dev); 1140 1141 return 0; 1142 } 1143 1144 /* 1145 * Restart the RC32434 ethernet controller. 1146 */ 1147 static void korina_restart_task(struct work_struct *work) 1148 { 1149 struct korina_private *lp = container_of(work, 1150 struct korina_private, restart_task); 1151 struct net_device *dev = lp->dev; 1152 1153 /* 1154 * Disable interrupts 1155 */ 1156 disable_irq(lp->rx_irq); 1157 disable_irq(lp->tx_irq); 1158 1159 writel(readl(&lp->tx_dma_regs->dmasm) | 1160 DMA_STAT_FINI | DMA_STAT_ERR, 1161 &lp->tx_dma_regs->dmasm); 1162 writel(readl(&lp->rx_dma_regs->dmasm) | 1163 DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR, 1164 &lp->rx_dma_regs->dmasm); 1165 1166 napi_disable(&lp->napi); 1167 1168 korina_free_ring(dev); 1169 1170 if (korina_init(dev) < 0) { 1171 printk(KERN_ERR "%s: cannot restart device\n", dev->name); 1172 return; 1173 } 1174 korina_multicast_list(dev); 1175 1176 enable_irq(lp->tx_irq); 1177 enable_irq(lp->rx_irq); 1178 } 1179 1180 static void korina_tx_timeout(struct net_device *dev, unsigned int txqueue) 1181 { 1182 struct korina_private *lp = netdev_priv(dev); 1183 1184 schedule_work(&lp->restart_task); 1185 } 1186 1187 #ifdef CONFIG_NET_POLL_CONTROLLER 1188 static void korina_poll_controller(struct net_device *dev) 1189 { 1190 disable_irq(dev->irq); 1191 korina_tx_dma_interrupt(dev->irq, dev); 1192 enable_irq(dev->irq); 1193 } 1194 #endif 1195 1196 static int korina_open(struct net_device *dev) 1197 { 1198 struct korina_private *lp = netdev_priv(dev); 1199 int ret; 1200 1201 /* Initialize */ 1202 ret = korina_init(dev); 1203 if (ret < 0) { 1204 printk(KERN_ERR "%s: cannot open device\n", dev->name); 1205 goto out; 1206 } 1207 1208 /* Install the interrupt handler 1209 * that handles the Done Finished */ 1210 ret = request_irq(lp->rx_irq, korina_rx_dma_interrupt, 1211 0, "Korina ethernet Rx", dev); 1212 if (ret < 0) { 1213 printk(KERN_ERR "%s: unable to get Rx DMA IRQ %d\n", 1214 dev->name, lp->rx_irq); 1215 goto err_release; 1216 } 1217 ret = request_irq(lp->tx_irq, korina_tx_dma_interrupt, 1218 0, "Korina ethernet Tx", dev); 1219 if (ret < 0) { 1220 printk(KERN_ERR "%s: unable to get Tx DMA IRQ %d\n", 1221 dev->name, lp->tx_irq); 1222 goto err_free_rx_irq; 1223 } 1224 1225 mod_timer(&lp->media_check_timer, jiffies + 1); 1226 out: 1227 return ret; 1228 1229 err_free_rx_irq: 1230 free_irq(lp->rx_irq, dev); 1231 err_release: 1232 korina_free_ring(dev); 1233 goto out; 1234 } 1235 1236 static int korina_close(struct net_device *dev) 1237 { 1238 struct korina_private *lp = netdev_priv(dev); 1239 u32 tmp; 1240 1241 del_timer(&lp->media_check_timer); 1242 1243 /* Disable interrupts */ 1244 disable_irq(lp->rx_irq); 1245 disable_irq(lp->tx_irq); 1246 1247 korina_abort_tx(dev); 1248 tmp = readl(&lp->tx_dma_regs->dmasm); 1249 tmp = tmp | DMA_STAT_FINI | DMA_STAT_ERR; 1250 writel(tmp, &lp->tx_dma_regs->dmasm); 1251 1252 korina_abort_rx(dev); 1253 tmp = readl(&lp->rx_dma_regs->dmasm); 1254 tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR; 1255 writel(tmp, &lp->rx_dma_regs->dmasm); 1256 1257 napi_disable(&lp->napi); 1258 1259 cancel_work_sync(&lp->restart_task); 1260 1261 korina_free_ring(dev); 1262 1263 free_irq(lp->rx_irq, dev); 1264 free_irq(lp->tx_irq, dev); 1265 1266 return 0; 1267 } 1268 1269 static const struct net_device_ops korina_netdev_ops = { 1270 .ndo_open = korina_open, 1271 .ndo_stop = korina_close, 1272 .ndo_start_xmit = korina_send_packet, 1273 .ndo_set_rx_mode = korina_multicast_list, 1274 .ndo_tx_timeout = korina_tx_timeout, 1275 .ndo_do_ioctl = korina_ioctl, 1276 .ndo_validate_addr = eth_validate_addr, 1277 .ndo_set_mac_address = eth_mac_addr, 1278 #ifdef CONFIG_NET_POLL_CONTROLLER 1279 .ndo_poll_controller = korina_poll_controller, 1280 #endif 1281 }; 1282 1283 static int korina_probe(struct platform_device *pdev) 1284 { 1285 u8 *mac_addr = dev_get_platdata(&pdev->dev); 1286 struct korina_private *lp; 1287 struct net_device *dev; 1288 struct clk *clk; 1289 void __iomem *p; 1290 int rc; 1291 1292 dev = devm_alloc_etherdev(&pdev->dev, sizeof(struct korina_private)); 1293 if (!dev) 1294 return -ENOMEM; 1295 1296 SET_NETDEV_DEV(dev, &pdev->dev); 1297 lp = netdev_priv(dev); 1298 1299 if (mac_addr) 1300 ether_addr_copy(dev->dev_addr, mac_addr); 1301 else if (of_get_mac_address(pdev->dev.of_node, dev->dev_addr) < 0) 1302 eth_hw_addr_random(dev); 1303 1304 clk = devm_clk_get_optional(&pdev->dev, "mdioclk"); 1305 if (IS_ERR(clk)) 1306 return PTR_ERR(clk); 1307 if (clk) { 1308 clk_prepare_enable(clk); 1309 lp->mii_clock_freq = clk_get_rate(clk); 1310 } else { 1311 lp->mii_clock_freq = 200000000; /* max possible input clk */ 1312 } 1313 1314 lp->rx_irq = platform_get_irq_byname(pdev, "rx"); 1315 lp->tx_irq = platform_get_irq_byname(pdev, "tx"); 1316 1317 p = devm_platform_ioremap_resource_byname(pdev, "emac"); 1318 if (!p) { 1319 printk(KERN_ERR DRV_NAME ": cannot remap registers\n"); 1320 return -ENOMEM; 1321 } 1322 lp->eth_regs = p; 1323 1324 p = devm_platform_ioremap_resource_byname(pdev, "dma_rx"); 1325 if (!p) { 1326 printk(KERN_ERR DRV_NAME ": cannot remap Rx DMA registers\n"); 1327 return -ENOMEM; 1328 } 1329 lp->rx_dma_regs = p; 1330 1331 p = devm_platform_ioremap_resource_byname(pdev, "dma_tx"); 1332 if (!p) { 1333 printk(KERN_ERR DRV_NAME ": cannot remap Tx DMA registers\n"); 1334 return -ENOMEM; 1335 } 1336 lp->tx_dma_regs = p; 1337 1338 lp->td_ring = dmam_alloc_coherent(&pdev->dev, TD_RING_SIZE, 1339 &lp->td_dma, GFP_KERNEL); 1340 if (!lp->td_ring) 1341 return -ENOMEM; 1342 1343 lp->rd_ring = dmam_alloc_coherent(&pdev->dev, RD_RING_SIZE, 1344 &lp->rd_dma, GFP_KERNEL); 1345 if (!lp->rd_ring) 1346 return -ENOMEM; 1347 1348 spin_lock_init(&lp->lock); 1349 /* just use the rx dma irq */ 1350 dev->irq = lp->rx_irq; 1351 lp->dev = dev; 1352 lp->dmadev = &pdev->dev; 1353 1354 dev->netdev_ops = &korina_netdev_ops; 1355 dev->ethtool_ops = &netdev_ethtool_ops; 1356 dev->watchdog_timeo = TX_TIMEOUT; 1357 netif_napi_add(dev, &lp->napi, korina_poll, NAPI_POLL_WEIGHT); 1358 1359 lp->mii_if.dev = dev; 1360 lp->mii_if.mdio_read = korina_mdio_read; 1361 lp->mii_if.mdio_write = korina_mdio_write; 1362 lp->mii_if.phy_id = 1; 1363 lp->mii_if.phy_id_mask = 0x1f; 1364 lp->mii_if.reg_num_mask = 0x1f; 1365 1366 platform_set_drvdata(pdev, dev); 1367 1368 rc = register_netdev(dev); 1369 if (rc < 0) { 1370 printk(KERN_ERR DRV_NAME 1371 ": cannot register net device: %d\n", rc); 1372 return rc; 1373 } 1374 timer_setup(&lp->media_check_timer, korina_poll_media, 0); 1375 1376 INIT_WORK(&lp->restart_task, korina_restart_task); 1377 1378 printk(KERN_INFO "%s: " DRV_NAME "-" DRV_VERSION " " DRV_RELDATE "\n", 1379 dev->name); 1380 return rc; 1381 } 1382 1383 static int korina_remove(struct platform_device *pdev) 1384 { 1385 struct net_device *dev = platform_get_drvdata(pdev); 1386 1387 unregister_netdev(dev); 1388 1389 return 0; 1390 } 1391 1392 #ifdef CONFIG_OF 1393 static const struct of_device_id korina_match[] = { 1394 { 1395 .compatible = "idt,3243x-emac", 1396 }, 1397 { } 1398 }; 1399 MODULE_DEVICE_TABLE(of, korina_match); 1400 #endif 1401 1402 static struct platform_driver korina_driver = { 1403 .driver = { 1404 .name = "korina", 1405 .of_match_table = of_match_ptr(korina_match), 1406 }, 1407 .probe = korina_probe, 1408 .remove = korina_remove, 1409 }; 1410 1411 module_platform_driver(korina_driver); 1412 1413 MODULE_AUTHOR("Philip Rischel <rischelp@idt.com>"); 1414 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); 1415 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 1416 MODULE_AUTHOR("Roman Yeryomin <roman@advem.lv>"); 1417 MODULE_DESCRIPTION("IDT RC32434 (Korina) Ethernet driver"); 1418 MODULE_LICENSE("GPL"); 1419