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.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 korina_tx_dma(struct korina_private * lp,int idx)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 korina_rx_dma(struct korina_private * lp,int idx)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 korina_abort_dma(struct net_device * dev,struct dma_reg * ch)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 korina_abort_tx(struct net_device * dev)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 korina_abort_rx(struct net_device * dev)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 */ korina_send_packet(struct sk_buff * skb,struct net_device * dev)419 static netdev_tx_t korina_send_packet(struct sk_buff *skb, 420 struct net_device *dev) 421 { 422 struct korina_private *lp = netdev_priv(dev); 423 u32 chain_prev, chain_next; 424 unsigned long flags; 425 struct dma_desc *td; 426 dma_addr_t ca; 427 u32 length; 428 int idx; 429 430 spin_lock_irqsave(&lp->lock, flags); 431 432 idx = lp->tx_chain_tail; 433 td = &lp->td_ring[idx]; 434 435 /* stop queue when full, drop pkts if queue already full */ 436 if (lp->tx_count >= (KORINA_NUM_TDS - 2)) { 437 lp->tx_full = 1; 438 439 if (lp->tx_count == (KORINA_NUM_TDS - 2)) 440 netif_stop_queue(dev); 441 else 442 goto drop_packet; 443 } 444 445 lp->tx_count++; 446 447 lp->tx_skb[idx] = skb; 448 449 length = skb->len; 450 451 /* Setup the transmit descriptor. */ 452 ca = dma_map_single(lp->dmadev, skb->data, length, DMA_TO_DEVICE); 453 if (dma_mapping_error(lp->dmadev, ca)) 454 goto drop_packet; 455 456 lp->tx_skb_dma[idx] = ca; 457 td->ca = ca; 458 459 chain_prev = (idx - 1) & KORINA_TDS_MASK; 460 chain_next = (idx + 1) & KORINA_TDS_MASK; 461 462 if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) { 463 if (lp->tx_chain_status == desc_is_empty) { 464 /* Update tail */ 465 td->control = DMA_COUNT(length) | 466 DMA_DESC_COF | DMA_DESC_IOF; 467 /* Move tail */ 468 lp->tx_chain_tail = chain_next; 469 /* Write to NDPTR */ 470 writel(korina_tx_dma(lp, lp->tx_chain_head), 471 &lp->tx_dma_regs->dmandptr); 472 /* Move head to tail */ 473 lp->tx_chain_head = lp->tx_chain_tail; 474 } else { 475 /* Update tail */ 476 td->control = DMA_COUNT(length) | 477 DMA_DESC_COF | DMA_DESC_IOF; 478 /* Link to prev */ 479 lp->td_ring[chain_prev].control &= 480 ~DMA_DESC_COF; 481 /* Link to prev */ 482 lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx); 483 /* Move tail */ 484 lp->tx_chain_tail = chain_next; 485 /* Write to NDPTR */ 486 writel(korina_tx_dma(lp, lp->tx_chain_head), 487 &lp->tx_dma_regs->dmandptr); 488 /* Move head to tail */ 489 lp->tx_chain_head = lp->tx_chain_tail; 490 lp->tx_chain_status = desc_is_empty; 491 } 492 } else { 493 if (lp->tx_chain_status == desc_is_empty) { 494 /* Update tail */ 495 td->control = DMA_COUNT(length) | 496 DMA_DESC_COF | DMA_DESC_IOF; 497 /* Move tail */ 498 lp->tx_chain_tail = chain_next; 499 lp->tx_chain_status = desc_filled; 500 } else { 501 /* Update tail */ 502 td->control = DMA_COUNT(length) | 503 DMA_DESC_COF | DMA_DESC_IOF; 504 lp->td_ring[chain_prev].control &= 505 ~DMA_DESC_COF; 506 lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx); 507 lp->tx_chain_tail = chain_next; 508 } 509 } 510 511 netif_trans_update(dev); 512 spin_unlock_irqrestore(&lp->lock, flags); 513 514 return NETDEV_TX_OK; 515 516 drop_packet: 517 dev->stats.tx_dropped++; 518 dev_kfree_skb_any(skb); 519 spin_unlock_irqrestore(&lp->lock, flags); 520 521 return NETDEV_TX_OK; 522 } 523 korina_mdio_wait(struct korina_private * lp)524 static int korina_mdio_wait(struct korina_private *lp) 525 { 526 u32 value; 527 528 return readl_poll_timeout_atomic(&lp->eth_regs->miimind, 529 value, value & ETH_MII_IND_BSY, 530 1, 1000); 531 } 532 korina_mdio_read(struct net_device * dev,int phy,int reg)533 static int korina_mdio_read(struct net_device *dev, int phy, int reg) 534 { 535 struct korina_private *lp = netdev_priv(dev); 536 int ret; 537 538 ret = korina_mdio_wait(lp); 539 if (ret < 0) 540 return ret; 541 542 writel(phy << 8 | reg, &lp->eth_regs->miimaddr); 543 writel(1, &lp->eth_regs->miimcmd); 544 545 ret = korina_mdio_wait(lp); 546 if (ret < 0) 547 return ret; 548 549 if (readl(&lp->eth_regs->miimind) & ETH_MII_IND_NV) 550 return -EINVAL; 551 552 ret = readl(&lp->eth_regs->miimrdd); 553 writel(0, &lp->eth_regs->miimcmd); 554 return ret; 555 } 556 korina_mdio_write(struct net_device * dev,int phy,int reg,int val)557 static void korina_mdio_write(struct net_device *dev, int phy, int reg, int val) 558 { 559 struct korina_private *lp = netdev_priv(dev); 560 561 if (korina_mdio_wait(lp)) 562 return; 563 564 writel(0, &lp->eth_regs->miimcmd); 565 writel(phy << 8 | reg, &lp->eth_regs->miimaddr); 566 writel(val, &lp->eth_regs->miimwtd); 567 } 568 569 /* Ethernet Rx DMA interrupt */ korina_rx_dma_interrupt(int irq,void * dev_id)570 static irqreturn_t korina_rx_dma_interrupt(int irq, void *dev_id) 571 { 572 struct net_device *dev = dev_id; 573 struct korina_private *lp = netdev_priv(dev); 574 u32 dmas, dmasm; 575 irqreturn_t retval; 576 577 dmas = readl(&lp->rx_dma_regs->dmas); 578 if (dmas & (DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR)) { 579 dmasm = readl(&lp->rx_dma_regs->dmasm); 580 writel(dmasm | (DMA_STAT_DONE | 581 DMA_STAT_HALT | DMA_STAT_ERR), 582 &lp->rx_dma_regs->dmasm); 583 584 napi_schedule(&lp->napi); 585 586 if (dmas & DMA_STAT_ERR) 587 printk(KERN_ERR "%s: DMA error\n", dev->name); 588 589 retval = IRQ_HANDLED; 590 } else 591 retval = IRQ_NONE; 592 593 return retval; 594 } 595 korina_rx(struct net_device * dev,int limit)596 static int korina_rx(struct net_device *dev, int limit) 597 { 598 struct korina_private *lp = netdev_priv(dev); 599 struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done]; 600 struct sk_buff *skb, *skb_new; 601 u32 devcs, pkt_len, dmas; 602 dma_addr_t ca; 603 int count; 604 605 for (count = 0; count < limit; count++) { 606 skb = lp->rx_skb[lp->rx_next_done]; 607 skb_new = NULL; 608 609 devcs = rd->devcs; 610 611 if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0) 612 break; 613 614 /* check that this is a whole packet 615 * WARNING: DMA_FD bit incorrectly set 616 * in Rc32434 (errata ref #077) */ 617 if (!(devcs & ETH_RX_LD)) 618 goto next; 619 620 if (!(devcs & ETH_RX_ROK)) { 621 /* Update statistics counters */ 622 dev->stats.rx_errors++; 623 dev->stats.rx_dropped++; 624 if (devcs & ETH_RX_CRC) 625 dev->stats.rx_crc_errors++; 626 if (devcs & ETH_RX_LE) 627 dev->stats.rx_length_errors++; 628 if (devcs & ETH_RX_OVR) 629 dev->stats.rx_fifo_errors++; 630 if (devcs & ETH_RX_CV) 631 dev->stats.rx_frame_errors++; 632 if (devcs & ETH_RX_CES) 633 dev->stats.rx_frame_errors++; 634 635 goto next; 636 } 637 638 /* Malloc up new buffer. */ 639 skb_new = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE); 640 if (!skb_new) 641 break; 642 643 ca = dma_map_single(lp->dmadev, skb_new->data, KORINA_RBSIZE, 644 DMA_FROM_DEVICE); 645 if (dma_mapping_error(lp->dmadev, ca)) { 646 dev_kfree_skb_any(skb_new); 647 break; 648 } 649 650 pkt_len = RCVPKT_LENGTH(devcs); 651 dma_unmap_single(lp->dmadev, lp->rx_skb_dma[lp->rx_next_done], 652 pkt_len, DMA_FROM_DEVICE); 653 654 /* Do not count the CRC */ 655 skb_put(skb, pkt_len - 4); 656 skb->protocol = eth_type_trans(skb, dev); 657 658 /* Pass the packet to upper layers */ 659 napi_gro_receive(&lp->napi, skb); 660 dev->stats.rx_packets++; 661 dev->stats.rx_bytes += pkt_len; 662 663 /* Update the mcast stats */ 664 if (devcs & ETH_RX_MP) 665 dev->stats.multicast++; 666 667 lp->rx_skb[lp->rx_next_done] = skb_new; 668 lp->rx_skb_dma[lp->rx_next_done] = ca; 669 670 next: 671 rd->devcs = 0; 672 673 /* Restore descriptor's curr_addr */ 674 rd->ca = lp->rx_skb_dma[lp->rx_next_done]; 675 676 rd->control = DMA_COUNT(KORINA_RBSIZE) | 677 DMA_DESC_COD | DMA_DESC_IOD; 678 lp->rd_ring[(lp->rx_next_done - 1) & 679 KORINA_RDS_MASK].control &= 680 ~DMA_DESC_COD; 681 682 lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK; 683 rd = &lp->rd_ring[lp->rx_next_done]; 684 writel((u32)~DMA_STAT_DONE, &lp->rx_dma_regs->dmas); 685 } 686 687 dmas = readl(&lp->rx_dma_regs->dmas); 688 689 if (dmas & DMA_STAT_HALT) { 690 writel((u32)~(DMA_STAT_HALT | DMA_STAT_ERR), 691 &lp->rx_dma_regs->dmas); 692 693 lp->dma_halt_cnt++; 694 rd->devcs = 0; 695 rd->ca = lp->rx_skb_dma[lp->rx_next_done]; 696 writel(korina_rx_dma(lp, rd - lp->rd_ring), 697 &lp->rx_dma_regs->dmandptr); 698 } 699 700 return count; 701 } 702 korina_poll(struct napi_struct * napi,int budget)703 static int korina_poll(struct napi_struct *napi, int budget) 704 { 705 struct korina_private *lp = 706 container_of(napi, struct korina_private, napi); 707 struct net_device *dev = lp->dev; 708 int work_done; 709 710 work_done = korina_rx(dev, budget); 711 if (work_done < budget) { 712 napi_complete_done(napi, work_done); 713 714 writel(readl(&lp->rx_dma_regs->dmasm) & 715 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR), 716 &lp->rx_dma_regs->dmasm); 717 } 718 return work_done; 719 } 720 721 /* 722 * Set or clear the multicast filter for this adaptor. 723 */ korina_multicast_list(struct net_device * dev)724 static void korina_multicast_list(struct net_device *dev) 725 { 726 struct korina_private *lp = netdev_priv(dev); 727 unsigned long flags; 728 struct netdev_hw_addr *ha; 729 u32 recognise = ETH_ARC_AB; /* always accept broadcasts */ 730 731 /* Set promiscuous mode */ 732 if (dev->flags & IFF_PROMISC) 733 recognise |= ETH_ARC_PRO; 734 735 else if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 4)) 736 /* All multicast and broadcast */ 737 recognise |= ETH_ARC_AM; 738 739 /* Build the hash table */ 740 if (netdev_mc_count(dev) > 4) { 741 u16 hash_table[4] = { 0 }; 742 u32 crc; 743 744 netdev_for_each_mc_addr(ha, dev) { 745 crc = ether_crc_le(6, ha->addr); 746 crc >>= 26; 747 hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf)); 748 } 749 /* Accept filtered multicast */ 750 recognise |= ETH_ARC_AFM; 751 752 /* Fill the MAC hash tables with their values */ 753 writel((u32)(hash_table[1] << 16 | hash_table[0]), 754 &lp->eth_regs->ethhash0); 755 writel((u32)(hash_table[3] << 16 | hash_table[2]), 756 &lp->eth_regs->ethhash1); 757 } 758 759 spin_lock_irqsave(&lp->lock, flags); 760 writel(recognise, &lp->eth_regs->etharc); 761 spin_unlock_irqrestore(&lp->lock, flags); 762 } 763 korina_tx(struct net_device * dev)764 static void korina_tx(struct net_device *dev) 765 { 766 struct korina_private *lp = netdev_priv(dev); 767 struct dma_desc *td = &lp->td_ring[lp->tx_next_done]; 768 u32 devcs; 769 u32 dmas; 770 771 spin_lock(&lp->lock); 772 773 /* Process all desc that are done */ 774 while (IS_DMA_FINISHED(td->control)) { 775 if (lp->tx_full == 1) { 776 netif_wake_queue(dev); 777 lp->tx_full = 0; 778 } 779 780 devcs = lp->td_ring[lp->tx_next_done].devcs; 781 if ((devcs & (ETH_TX_FD | ETH_TX_LD)) != 782 (ETH_TX_FD | ETH_TX_LD)) { 783 dev->stats.tx_errors++; 784 dev->stats.tx_dropped++; 785 786 /* Should never happen */ 787 printk(KERN_ERR "%s: split tx ignored\n", 788 dev->name); 789 } else if (devcs & ETH_TX_TOK) { 790 dev->stats.tx_packets++; 791 dev->stats.tx_bytes += 792 lp->tx_skb[lp->tx_next_done]->len; 793 } else { 794 dev->stats.tx_errors++; 795 dev->stats.tx_dropped++; 796 797 /* Underflow */ 798 if (devcs & ETH_TX_UND) 799 dev->stats.tx_fifo_errors++; 800 801 /* Oversized frame */ 802 if (devcs & ETH_TX_OF) 803 dev->stats.tx_aborted_errors++; 804 805 /* Excessive deferrals */ 806 if (devcs & ETH_TX_ED) 807 dev->stats.tx_carrier_errors++; 808 809 /* Collisions: medium busy */ 810 if (devcs & ETH_TX_EC) 811 dev->stats.collisions++; 812 813 /* Late collision */ 814 if (devcs & ETH_TX_LC) 815 dev->stats.tx_window_errors++; 816 } 817 818 /* We must always free the original skb */ 819 if (lp->tx_skb[lp->tx_next_done]) { 820 dma_unmap_single(lp->dmadev, 821 lp->tx_skb_dma[lp->tx_next_done], 822 lp->tx_skb[lp->tx_next_done]->len, 823 DMA_TO_DEVICE); 824 dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]); 825 lp->tx_skb[lp->tx_next_done] = NULL; 826 } 827 828 lp->td_ring[lp->tx_next_done].control = DMA_DESC_IOF; 829 lp->td_ring[lp->tx_next_done].devcs = ETH_TX_FD | ETH_TX_LD; 830 lp->td_ring[lp->tx_next_done].link = 0; 831 lp->td_ring[lp->tx_next_done].ca = 0; 832 lp->tx_count--; 833 834 /* Go on to next transmission */ 835 lp->tx_next_done = (lp->tx_next_done + 1) & KORINA_TDS_MASK; 836 td = &lp->td_ring[lp->tx_next_done]; 837 838 } 839 840 /* Clear the DMA status register */ 841 dmas = readl(&lp->tx_dma_regs->dmas); 842 writel(~dmas, &lp->tx_dma_regs->dmas); 843 844 writel(readl(&lp->tx_dma_regs->dmasm) & 845 ~(DMA_STAT_FINI | DMA_STAT_ERR), 846 &lp->tx_dma_regs->dmasm); 847 848 spin_unlock(&lp->lock); 849 } 850 851 static irqreturn_t korina_tx_dma_interrupt(int irq,void * dev_id)852 korina_tx_dma_interrupt(int irq, void *dev_id) 853 { 854 struct net_device *dev = dev_id; 855 struct korina_private *lp = netdev_priv(dev); 856 u32 dmas, dmasm; 857 irqreturn_t retval; 858 859 dmas = readl(&lp->tx_dma_regs->dmas); 860 861 if (dmas & (DMA_STAT_FINI | DMA_STAT_ERR)) { 862 dmasm = readl(&lp->tx_dma_regs->dmasm); 863 writel(dmasm | (DMA_STAT_FINI | DMA_STAT_ERR), 864 &lp->tx_dma_regs->dmasm); 865 866 korina_tx(dev); 867 868 if (lp->tx_chain_status == desc_filled && 869 (readl(&(lp->tx_dma_regs->dmandptr)) == 0)) { 870 writel(korina_tx_dma(lp, lp->tx_chain_head), 871 &lp->tx_dma_regs->dmandptr); 872 lp->tx_chain_status = desc_is_empty; 873 lp->tx_chain_head = lp->tx_chain_tail; 874 netif_trans_update(dev); 875 } 876 if (dmas & DMA_STAT_ERR) 877 printk(KERN_ERR "%s: DMA error\n", dev->name); 878 879 retval = IRQ_HANDLED; 880 } else 881 retval = IRQ_NONE; 882 883 return retval; 884 } 885 886 korina_check_media(struct net_device * dev,unsigned int init_media)887 static void korina_check_media(struct net_device *dev, unsigned int init_media) 888 { 889 struct korina_private *lp = netdev_priv(dev); 890 891 mii_check_media(&lp->mii_if, 1, init_media); 892 893 if (lp->mii_if.full_duplex) 894 writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD, 895 &lp->eth_regs->ethmac2); 896 else 897 writel(readl(&lp->eth_regs->ethmac2) & ~ETH_MAC2_FD, 898 &lp->eth_regs->ethmac2); 899 } 900 korina_poll_media(struct timer_list * t)901 static void korina_poll_media(struct timer_list *t) 902 { 903 struct korina_private *lp = from_timer(lp, t, media_check_timer); 904 struct net_device *dev = lp->dev; 905 906 korina_check_media(dev, 0); 907 mod_timer(&lp->media_check_timer, jiffies + HZ); 908 } 909 korina_set_carrier(struct mii_if_info * mii)910 static void korina_set_carrier(struct mii_if_info *mii) 911 { 912 if (mii->force_media) { 913 /* autoneg is off: Link is always assumed to be up */ 914 if (!netif_carrier_ok(mii->dev)) 915 netif_carrier_on(mii->dev); 916 } else /* Let MMI library update carrier status */ 917 korina_check_media(mii->dev, 0); 918 } 919 korina_ioctl(struct net_device * dev,struct ifreq * rq,int cmd)920 static int korina_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 921 { 922 struct korina_private *lp = netdev_priv(dev); 923 struct mii_ioctl_data *data = if_mii(rq); 924 int rc; 925 926 if (!netif_running(dev)) 927 return -EINVAL; 928 spin_lock_irq(&lp->lock); 929 rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL); 930 spin_unlock_irq(&lp->lock); 931 korina_set_carrier(&lp->mii_if); 932 933 return rc; 934 } 935 936 /* ethtool helpers */ netdev_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)937 static void netdev_get_drvinfo(struct net_device *dev, 938 struct ethtool_drvinfo *info) 939 { 940 struct korina_private *lp = netdev_priv(dev); 941 942 strscpy(info->driver, DRV_NAME, sizeof(info->driver)); 943 strscpy(info->version, DRV_VERSION, sizeof(info->version)); 944 strscpy(info->bus_info, lp->dev->name, sizeof(info->bus_info)); 945 } 946 netdev_get_link_ksettings(struct net_device * dev,struct ethtool_link_ksettings * cmd)947 static int netdev_get_link_ksettings(struct net_device *dev, 948 struct ethtool_link_ksettings *cmd) 949 { 950 struct korina_private *lp = netdev_priv(dev); 951 952 spin_lock_irq(&lp->lock); 953 mii_ethtool_get_link_ksettings(&lp->mii_if, cmd); 954 spin_unlock_irq(&lp->lock); 955 956 return 0; 957 } 958 netdev_set_link_ksettings(struct net_device * dev,const struct ethtool_link_ksettings * cmd)959 static int netdev_set_link_ksettings(struct net_device *dev, 960 const struct ethtool_link_ksettings *cmd) 961 { 962 struct korina_private *lp = netdev_priv(dev); 963 int rc; 964 965 spin_lock_irq(&lp->lock); 966 rc = mii_ethtool_set_link_ksettings(&lp->mii_if, cmd); 967 spin_unlock_irq(&lp->lock); 968 korina_set_carrier(&lp->mii_if); 969 970 return rc; 971 } 972 netdev_get_link(struct net_device * dev)973 static u32 netdev_get_link(struct net_device *dev) 974 { 975 struct korina_private *lp = netdev_priv(dev); 976 977 return mii_link_ok(&lp->mii_if); 978 } 979 980 static const struct ethtool_ops netdev_ethtool_ops = { 981 .get_drvinfo = netdev_get_drvinfo, 982 .get_link = netdev_get_link, 983 .get_link_ksettings = netdev_get_link_ksettings, 984 .set_link_ksettings = netdev_set_link_ksettings, 985 }; 986 korina_alloc_ring(struct net_device * dev)987 static int korina_alloc_ring(struct net_device *dev) 988 { 989 struct korina_private *lp = netdev_priv(dev); 990 struct sk_buff *skb; 991 dma_addr_t ca; 992 int i; 993 994 /* Initialize the transmit descriptors */ 995 for (i = 0; i < KORINA_NUM_TDS; i++) { 996 lp->td_ring[i].control = DMA_DESC_IOF; 997 lp->td_ring[i].devcs = ETH_TX_FD | ETH_TX_LD; 998 lp->td_ring[i].ca = 0; 999 lp->td_ring[i].link = 0; 1000 } 1001 lp->tx_next_done = lp->tx_chain_head = lp->tx_chain_tail = 1002 lp->tx_full = lp->tx_count = 0; 1003 lp->tx_chain_status = desc_is_empty; 1004 1005 /* Initialize the receive descriptors */ 1006 for (i = 0; i < KORINA_NUM_RDS; i++) { 1007 skb = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE); 1008 if (!skb) 1009 return -ENOMEM; 1010 lp->rx_skb[i] = skb; 1011 lp->rd_ring[i].control = DMA_DESC_IOD | 1012 DMA_COUNT(KORINA_RBSIZE); 1013 lp->rd_ring[i].devcs = 0; 1014 ca = dma_map_single(lp->dmadev, skb->data, KORINA_RBSIZE, 1015 DMA_FROM_DEVICE); 1016 if (dma_mapping_error(lp->dmadev, ca)) 1017 return -ENOMEM; 1018 lp->rd_ring[i].ca = ca; 1019 lp->rx_skb_dma[i] = ca; 1020 lp->rd_ring[i].link = korina_rx_dma(lp, i + 1); 1021 } 1022 1023 /* loop back receive descriptors, so the last 1024 * descriptor points to the first one */ 1025 lp->rd_ring[i - 1].link = lp->rd_dma; 1026 lp->rd_ring[i - 1].control |= DMA_DESC_COD; 1027 1028 lp->rx_next_done = 0; 1029 lp->rx_chain_head = 0; 1030 lp->rx_chain_tail = 0; 1031 lp->rx_chain_status = desc_is_empty; 1032 1033 return 0; 1034 } 1035 korina_free_ring(struct net_device * dev)1036 static void korina_free_ring(struct net_device *dev) 1037 { 1038 struct korina_private *lp = netdev_priv(dev); 1039 int i; 1040 1041 for (i = 0; i < KORINA_NUM_RDS; i++) { 1042 lp->rd_ring[i].control = 0; 1043 if (lp->rx_skb[i]) { 1044 dma_unmap_single(lp->dmadev, lp->rx_skb_dma[i], 1045 KORINA_RBSIZE, DMA_FROM_DEVICE); 1046 dev_kfree_skb_any(lp->rx_skb[i]); 1047 lp->rx_skb[i] = NULL; 1048 } 1049 } 1050 1051 for (i = 0; i < KORINA_NUM_TDS; i++) { 1052 lp->td_ring[i].control = 0; 1053 if (lp->tx_skb[i]) { 1054 dma_unmap_single(lp->dmadev, lp->tx_skb_dma[i], 1055 lp->tx_skb[i]->len, DMA_TO_DEVICE); 1056 dev_kfree_skb_any(lp->tx_skb[i]); 1057 lp->tx_skb[i] = NULL; 1058 } 1059 } 1060 } 1061 1062 /* 1063 * Initialize the RC32434 ethernet controller. 1064 */ korina_init(struct net_device * dev)1065 static int korina_init(struct net_device *dev) 1066 { 1067 struct korina_private *lp = netdev_priv(dev); 1068 1069 /* Disable DMA */ 1070 korina_abort_tx(dev); 1071 korina_abort_rx(dev); 1072 1073 /* reset ethernet logic */ 1074 writel(0, &lp->eth_regs->ethintfc); 1075 while ((readl(&lp->eth_regs->ethintfc) & ETH_INT_FC_RIP)) 1076 netif_trans_update(dev); 1077 1078 /* Enable Ethernet Interface */ 1079 writel(ETH_INT_FC_EN, &lp->eth_regs->ethintfc); 1080 1081 /* Allocate rings */ 1082 if (korina_alloc_ring(dev)) { 1083 printk(KERN_ERR "%s: descriptor allocation failed\n", dev->name); 1084 korina_free_ring(dev); 1085 return -ENOMEM; 1086 } 1087 1088 writel(0, &lp->rx_dma_regs->dmas); 1089 /* Start Rx DMA */ 1090 writel(0, &lp->rx_dma_regs->dmandptr); 1091 writel(korina_rx_dma(lp, 0), &lp->rx_dma_regs->dmadptr); 1092 1093 writel(readl(&lp->tx_dma_regs->dmasm) & 1094 ~(DMA_STAT_FINI | DMA_STAT_ERR), 1095 &lp->tx_dma_regs->dmasm); 1096 writel(readl(&lp->rx_dma_regs->dmasm) & 1097 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR), 1098 &lp->rx_dma_regs->dmasm); 1099 1100 /* Accept only packets destined for this Ethernet device address */ 1101 writel(ETH_ARC_AB, &lp->eth_regs->etharc); 1102 1103 /* Set all Ether station address registers to their initial values */ 1104 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal0); 1105 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah0); 1106 1107 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal1); 1108 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah1); 1109 1110 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal2); 1111 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah2); 1112 1113 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal3); 1114 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah3); 1115 1116 1117 /* Frame Length Checking, Pad Enable, CRC Enable, Full Duplex set */ 1118 writel(ETH_MAC2_PE | ETH_MAC2_CEN | ETH_MAC2_FD, 1119 &lp->eth_regs->ethmac2); 1120 1121 /* Back to back inter-packet-gap */ 1122 writel(0x15, &lp->eth_regs->ethipgt); 1123 /* Non - Back to back inter-packet-gap */ 1124 writel(0x12, &lp->eth_regs->ethipgr); 1125 1126 /* Management Clock Prescaler Divisor 1127 * Clock independent setting */ 1128 writel(((lp->mii_clock_freq) / MII_CLOCK + 1) & ~1, 1129 &lp->eth_regs->ethmcp); 1130 writel(0, &lp->eth_regs->miimcfg); 1131 1132 /* don't transmit until fifo contains 48b */ 1133 writel(48, &lp->eth_regs->ethfifott); 1134 1135 writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1); 1136 1137 korina_check_media(dev, 1); 1138 1139 napi_enable(&lp->napi); 1140 netif_start_queue(dev); 1141 1142 return 0; 1143 } 1144 1145 /* 1146 * Restart the RC32434 ethernet controller. 1147 */ korina_restart_task(struct work_struct * work)1148 static void korina_restart_task(struct work_struct *work) 1149 { 1150 struct korina_private *lp = container_of(work, 1151 struct korina_private, restart_task); 1152 struct net_device *dev = lp->dev; 1153 1154 /* 1155 * Disable interrupts 1156 */ 1157 disable_irq(lp->rx_irq); 1158 disable_irq(lp->tx_irq); 1159 1160 writel(readl(&lp->tx_dma_regs->dmasm) | 1161 DMA_STAT_FINI | DMA_STAT_ERR, 1162 &lp->tx_dma_regs->dmasm); 1163 writel(readl(&lp->rx_dma_regs->dmasm) | 1164 DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR, 1165 &lp->rx_dma_regs->dmasm); 1166 1167 napi_disable(&lp->napi); 1168 1169 korina_free_ring(dev); 1170 1171 if (korina_init(dev) < 0) { 1172 printk(KERN_ERR "%s: cannot restart device\n", dev->name); 1173 return; 1174 } 1175 korina_multicast_list(dev); 1176 1177 enable_irq(lp->tx_irq); 1178 enable_irq(lp->rx_irq); 1179 } 1180 korina_tx_timeout(struct net_device * dev,unsigned int txqueue)1181 static void korina_tx_timeout(struct net_device *dev, unsigned int txqueue) 1182 { 1183 struct korina_private *lp = netdev_priv(dev); 1184 1185 schedule_work(&lp->restart_task); 1186 } 1187 1188 #ifdef CONFIG_NET_POLL_CONTROLLER korina_poll_controller(struct net_device * dev)1189 static void korina_poll_controller(struct net_device *dev) 1190 { 1191 disable_irq(dev->irq); 1192 korina_tx_dma_interrupt(dev->irq, dev); 1193 enable_irq(dev->irq); 1194 } 1195 #endif 1196 korina_open(struct net_device * dev)1197 static int korina_open(struct net_device *dev) 1198 { 1199 struct korina_private *lp = netdev_priv(dev); 1200 int ret; 1201 1202 /* Initialize */ 1203 ret = korina_init(dev); 1204 if (ret < 0) { 1205 printk(KERN_ERR "%s: cannot open device\n", dev->name); 1206 goto out; 1207 } 1208 1209 /* Install the interrupt handler 1210 * that handles the Done Finished */ 1211 ret = request_irq(lp->rx_irq, korina_rx_dma_interrupt, 1212 0, "Korina ethernet Rx", dev); 1213 if (ret < 0) { 1214 printk(KERN_ERR "%s: unable to get Rx DMA IRQ %d\n", 1215 dev->name, lp->rx_irq); 1216 goto err_release; 1217 } 1218 ret = request_irq(lp->tx_irq, korina_tx_dma_interrupt, 1219 0, "Korina ethernet Tx", dev); 1220 if (ret < 0) { 1221 printk(KERN_ERR "%s: unable to get Tx DMA IRQ %d\n", 1222 dev->name, lp->tx_irq); 1223 goto err_free_rx_irq; 1224 } 1225 1226 mod_timer(&lp->media_check_timer, jiffies + 1); 1227 out: 1228 return ret; 1229 1230 err_free_rx_irq: 1231 free_irq(lp->rx_irq, dev); 1232 err_release: 1233 korina_free_ring(dev); 1234 goto out; 1235 } 1236 korina_close(struct net_device * dev)1237 static int korina_close(struct net_device *dev) 1238 { 1239 struct korina_private *lp = netdev_priv(dev); 1240 u32 tmp; 1241 1242 del_timer(&lp->media_check_timer); 1243 1244 /* Disable interrupts */ 1245 disable_irq(lp->rx_irq); 1246 disable_irq(lp->tx_irq); 1247 1248 korina_abort_tx(dev); 1249 tmp = readl(&lp->tx_dma_regs->dmasm); 1250 tmp = tmp | DMA_STAT_FINI | DMA_STAT_ERR; 1251 writel(tmp, &lp->tx_dma_regs->dmasm); 1252 1253 korina_abort_rx(dev); 1254 tmp = readl(&lp->rx_dma_regs->dmasm); 1255 tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR; 1256 writel(tmp, &lp->rx_dma_regs->dmasm); 1257 1258 napi_disable(&lp->napi); 1259 1260 cancel_work_sync(&lp->restart_task); 1261 1262 korina_free_ring(dev); 1263 1264 free_irq(lp->rx_irq, dev); 1265 free_irq(lp->tx_irq, dev); 1266 1267 return 0; 1268 } 1269 1270 static const struct net_device_ops korina_netdev_ops = { 1271 .ndo_open = korina_open, 1272 .ndo_stop = korina_close, 1273 .ndo_start_xmit = korina_send_packet, 1274 .ndo_set_rx_mode = korina_multicast_list, 1275 .ndo_tx_timeout = korina_tx_timeout, 1276 .ndo_eth_ioctl = korina_ioctl, 1277 .ndo_validate_addr = eth_validate_addr, 1278 .ndo_set_mac_address = eth_mac_addr, 1279 #ifdef CONFIG_NET_POLL_CONTROLLER 1280 .ndo_poll_controller = korina_poll_controller, 1281 #endif 1282 }; 1283 korina_probe(struct platform_device * pdev)1284 static int korina_probe(struct platform_device *pdev) 1285 { 1286 u8 *mac_addr = dev_get_platdata(&pdev->dev); 1287 struct korina_private *lp; 1288 struct net_device *dev; 1289 struct clk *clk; 1290 void __iomem *p; 1291 int rc; 1292 1293 dev = devm_alloc_etherdev(&pdev->dev, sizeof(struct korina_private)); 1294 if (!dev) 1295 return -ENOMEM; 1296 1297 SET_NETDEV_DEV(dev, &pdev->dev); 1298 lp = netdev_priv(dev); 1299 1300 if (mac_addr) 1301 eth_hw_addr_set(dev, mac_addr); 1302 else if (of_get_ethdev_address(pdev->dev.of_node, dev) < 0) 1303 eth_hw_addr_random(dev); 1304 1305 clk = devm_clk_get_optional_enabled(&pdev->dev, "mdioclk"); 1306 if (IS_ERR(clk)) 1307 return PTR_ERR(clk); 1308 if (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 (IS_ERR(p)) { 1319 printk(KERN_ERR DRV_NAME ": cannot remap registers\n"); 1320 return PTR_ERR(p); 1321 } 1322 lp->eth_regs = p; 1323 1324 p = devm_platform_ioremap_resource_byname(pdev, "dma_rx"); 1325 if (IS_ERR(p)) { 1326 printk(KERN_ERR DRV_NAME ": cannot remap Rx DMA registers\n"); 1327 return PTR_ERR(p); 1328 } 1329 lp->rx_dma_regs = p; 1330 1331 p = devm_platform_ioremap_resource_byname(pdev, "dma_tx"); 1332 if (IS_ERR(p)) { 1333 printk(KERN_ERR DRV_NAME ": cannot remap Tx DMA registers\n"); 1334 return PTR_ERR(p); 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); 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 korina_remove(struct platform_device * pdev)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