1 // SPDX-License-Identifier: GPL-2.0 2 /* Ethernet device driver for Cortina Systems Gemini SoC 3 * Also known as the StorLink SL3512 and SL3516 (SL351x) or Lepus 4 * Net Engine and Gigabit Ethernet MAC (GMAC) 5 * This hardware contains a TCP Offload Engine (TOE) but currently the 6 * driver does not make use of it. 7 * 8 * Authors: 9 * Linus Walleij <linus.walleij@linaro.org> 10 * Tobias Waldvogel <tobias.waldvogel@gmail.com> (OpenWRT) 11 * Michał Mirosław <mirq-linux@rere.qmqm.pl> 12 * Paulius Zaleckas <paulius.zaleckas@gmail.com> 13 * Giuseppe De Robertis <Giuseppe.DeRobertis@ba.infn.it> 14 * Gary Chen & Ch Hsu Storlink Semiconductor 15 */ 16 #include <linux/kernel.h> 17 #include <linux/init.h> 18 #include <linux/module.h> 19 #include <linux/platform_device.h> 20 #include <linux/spinlock.h> 21 #include <linux/slab.h> 22 #include <linux/dma-mapping.h> 23 #include <linux/cache.h> 24 #include <linux/interrupt.h> 25 #include <linux/reset.h> 26 #include <linux/clk.h> 27 #include <linux/of.h> 28 #include <linux/of_mdio.h> 29 #include <linux/of_net.h> 30 #include <linux/of_platform.h> 31 #include <linux/etherdevice.h> 32 #include <linux/if_vlan.h> 33 #include <linux/skbuff.h> 34 #include <linux/phy.h> 35 #include <linux/crc32.h> 36 #include <linux/ethtool.h> 37 #include <linux/tcp.h> 38 #include <linux/u64_stats_sync.h> 39 40 #include <linux/in.h> 41 #include <linux/ip.h> 42 #include <linux/ipv6.h> 43 #include <net/gro.h> 44 45 #include "gemini.h" 46 47 #define DRV_NAME "gmac-gemini" 48 49 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK) 50 static int debug = -1; 51 module_param(debug, int, 0); 52 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)"); 53 54 #define HSIZE_8 0x00 55 #define HSIZE_16 0x01 56 #define HSIZE_32 0x02 57 58 #define HBURST_SINGLE 0x00 59 #define HBURST_INCR 0x01 60 #define HBURST_INCR4 0x02 61 #define HBURST_INCR8 0x03 62 63 #define HPROT_DATA_CACHE BIT(0) 64 #define HPROT_PRIVILIGED BIT(1) 65 #define HPROT_BUFFERABLE BIT(2) 66 #define HPROT_CACHABLE BIT(3) 67 68 #define DEFAULT_RX_COALESCE_NSECS 0 69 #define DEFAULT_GMAC_RXQ_ORDER 9 70 #define DEFAULT_GMAC_TXQ_ORDER 8 71 #define DEFAULT_RX_BUF_ORDER 11 72 #define TX_MAX_FRAGS 16 73 #define TX_QUEUE_NUM 1 /* max: 6 */ 74 #define RX_MAX_ALLOC_ORDER 2 75 76 #define GMAC0_IRQ0_2 (GMAC0_TXDERR_INT_BIT | GMAC0_TXPERR_INT_BIT | \ 77 GMAC0_RXDERR_INT_BIT | GMAC0_RXPERR_INT_BIT) 78 #define GMAC0_IRQ0_TXQ0_INTS (GMAC0_SWTQ00_EOF_INT_BIT | \ 79 GMAC0_SWTQ00_FIN_INT_BIT) 80 #define GMAC0_IRQ4_8 (GMAC0_MIB_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT) 81 82 #define GMAC_OFFLOAD_FEATURES (NETIF_F_SG | NETIF_F_IP_CSUM | \ 83 NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | \ 84 NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 85 86 /** 87 * struct gmac_queue_page - page buffer per-page info 88 * @page: the page struct 89 * @mapping: the dma address handle 90 */ 91 struct gmac_queue_page { 92 struct page *page; 93 dma_addr_t mapping; 94 }; 95 96 struct gmac_txq { 97 struct gmac_txdesc *ring; 98 struct sk_buff **skb; 99 unsigned int cptr; 100 unsigned int noirq_packets; 101 }; 102 103 struct gemini_ethernet; 104 105 struct gemini_ethernet_port { 106 u8 id; /* 0 or 1 */ 107 108 struct gemini_ethernet *geth; 109 struct net_device *netdev; 110 struct device *dev; 111 void __iomem *dma_base; 112 void __iomem *gmac_base; 113 struct clk *pclk; 114 struct reset_control *reset; 115 int irq; 116 __le32 mac_addr[3]; 117 118 void __iomem *rxq_rwptr; 119 struct gmac_rxdesc *rxq_ring; 120 unsigned int rxq_order; 121 122 struct napi_struct napi; 123 struct hrtimer rx_coalesce_timer; 124 unsigned int rx_coalesce_nsecs; 125 unsigned int freeq_refill; 126 struct gmac_txq txq[TX_QUEUE_NUM]; 127 unsigned int txq_order; 128 unsigned int irq_every_tx_packets; 129 130 dma_addr_t rxq_dma_base; 131 dma_addr_t txq_dma_base; 132 133 unsigned int msg_enable; 134 spinlock_t config_lock; /* Locks config register */ 135 136 struct u64_stats_sync tx_stats_syncp; 137 struct u64_stats_sync rx_stats_syncp; 138 struct u64_stats_sync ir_stats_syncp; 139 140 struct rtnl_link_stats64 stats; 141 u64 hw_stats[RX_STATS_NUM]; 142 u64 rx_stats[RX_STATUS_NUM]; 143 u64 rx_csum_stats[RX_CHKSUM_NUM]; 144 u64 rx_napi_exits; 145 u64 tx_frag_stats[TX_MAX_FRAGS]; 146 u64 tx_frags_linearized; 147 u64 tx_hw_csummed; 148 }; 149 150 struct gemini_ethernet { 151 struct device *dev; 152 void __iomem *base; 153 struct gemini_ethernet_port *port0; 154 struct gemini_ethernet_port *port1; 155 bool initialized; 156 157 spinlock_t irq_lock; /* Locks IRQ-related registers */ 158 unsigned int freeq_order; 159 unsigned int freeq_frag_order; 160 struct gmac_rxdesc *freeq_ring; 161 dma_addr_t freeq_dma_base; 162 struct gmac_queue_page *freeq_pages; 163 unsigned int num_freeq_pages; 164 spinlock_t freeq_lock; /* Locks queue from reentrance */ 165 }; 166 167 #define GMAC_STATS_NUM ( \ 168 RX_STATS_NUM + RX_STATUS_NUM + RX_CHKSUM_NUM + 1 + \ 169 TX_MAX_FRAGS + 2) 170 171 static const char gmac_stats_strings[GMAC_STATS_NUM][ETH_GSTRING_LEN] = { 172 "GMAC_IN_DISCARDS", 173 "GMAC_IN_ERRORS", 174 "GMAC_IN_MCAST", 175 "GMAC_IN_BCAST", 176 "GMAC_IN_MAC1", 177 "GMAC_IN_MAC2", 178 "RX_STATUS_GOOD_FRAME", 179 "RX_STATUS_TOO_LONG_GOOD_CRC", 180 "RX_STATUS_RUNT_FRAME", 181 "RX_STATUS_SFD_NOT_FOUND", 182 "RX_STATUS_CRC_ERROR", 183 "RX_STATUS_TOO_LONG_BAD_CRC", 184 "RX_STATUS_ALIGNMENT_ERROR", 185 "RX_STATUS_TOO_LONG_BAD_ALIGN", 186 "RX_STATUS_RX_ERR", 187 "RX_STATUS_DA_FILTERED", 188 "RX_STATUS_BUFFER_FULL", 189 "RX_STATUS_11", 190 "RX_STATUS_12", 191 "RX_STATUS_13", 192 "RX_STATUS_14", 193 "RX_STATUS_15", 194 "RX_CHKSUM_IP_UDP_TCP_OK", 195 "RX_CHKSUM_IP_OK_ONLY", 196 "RX_CHKSUM_NONE", 197 "RX_CHKSUM_3", 198 "RX_CHKSUM_IP_ERR_UNKNOWN", 199 "RX_CHKSUM_IP_ERR", 200 "RX_CHKSUM_TCP_UDP_ERR", 201 "RX_CHKSUM_7", 202 "RX_NAPI_EXITS", 203 "TX_FRAGS[1]", 204 "TX_FRAGS[2]", 205 "TX_FRAGS[3]", 206 "TX_FRAGS[4]", 207 "TX_FRAGS[5]", 208 "TX_FRAGS[6]", 209 "TX_FRAGS[7]", 210 "TX_FRAGS[8]", 211 "TX_FRAGS[9]", 212 "TX_FRAGS[10]", 213 "TX_FRAGS[11]", 214 "TX_FRAGS[12]", 215 "TX_FRAGS[13]", 216 "TX_FRAGS[14]", 217 "TX_FRAGS[15]", 218 "TX_FRAGS[16+]", 219 "TX_FRAGS_LINEARIZED", 220 "TX_HW_CSUMMED", 221 }; 222 223 static void gmac_dump_dma_state(struct net_device *netdev); 224 225 static void gmac_update_config0_reg(struct net_device *netdev, 226 u32 val, u32 vmask) 227 { 228 struct gemini_ethernet_port *port = netdev_priv(netdev); 229 unsigned long flags; 230 u32 reg; 231 232 spin_lock_irqsave(&port->config_lock, flags); 233 234 reg = readl(port->gmac_base + GMAC_CONFIG0); 235 reg = (reg & ~vmask) | val; 236 writel(reg, port->gmac_base + GMAC_CONFIG0); 237 238 spin_unlock_irqrestore(&port->config_lock, flags); 239 } 240 241 static void gmac_enable_tx_rx(struct net_device *netdev) 242 { 243 struct gemini_ethernet_port *port = netdev_priv(netdev); 244 unsigned long flags; 245 u32 reg; 246 247 spin_lock_irqsave(&port->config_lock, flags); 248 249 reg = readl(port->gmac_base + GMAC_CONFIG0); 250 reg &= ~CONFIG0_TX_RX_DISABLE; 251 writel(reg, port->gmac_base + GMAC_CONFIG0); 252 253 spin_unlock_irqrestore(&port->config_lock, flags); 254 } 255 256 static void gmac_disable_tx_rx(struct net_device *netdev) 257 { 258 struct gemini_ethernet_port *port = netdev_priv(netdev); 259 unsigned long flags; 260 u32 val; 261 262 spin_lock_irqsave(&port->config_lock, flags); 263 264 val = readl(port->gmac_base + GMAC_CONFIG0); 265 val |= CONFIG0_TX_RX_DISABLE; 266 writel(val, port->gmac_base + GMAC_CONFIG0); 267 268 spin_unlock_irqrestore(&port->config_lock, flags); 269 270 mdelay(10); /* let GMAC consume packet */ 271 } 272 273 static void gmac_set_flow_control(struct net_device *netdev, bool tx, bool rx) 274 { 275 struct gemini_ethernet_port *port = netdev_priv(netdev); 276 unsigned long flags; 277 u32 val; 278 279 spin_lock_irqsave(&port->config_lock, flags); 280 281 val = readl(port->gmac_base + GMAC_CONFIG0); 282 val &= ~CONFIG0_FLOW_CTL; 283 if (tx) 284 val |= CONFIG0_FLOW_TX; 285 if (rx) 286 val |= CONFIG0_FLOW_RX; 287 writel(val, port->gmac_base + GMAC_CONFIG0); 288 289 spin_unlock_irqrestore(&port->config_lock, flags); 290 } 291 292 static void gmac_adjust_link(struct net_device *netdev) 293 { 294 struct gemini_ethernet_port *port = netdev_priv(netdev); 295 struct phy_device *phydev = netdev->phydev; 296 union gmac_status status, old_status; 297 bool pause_tx = false; 298 bool pause_rx = false; 299 300 status.bits32 = readl(port->gmac_base + GMAC_STATUS); 301 old_status.bits32 = status.bits32; 302 status.bits.link = phydev->link; 303 status.bits.duplex = phydev->duplex; 304 305 switch (phydev->speed) { 306 case 1000: 307 status.bits.speed = GMAC_SPEED_1000; 308 if (phy_interface_mode_is_rgmii(phydev->interface)) 309 status.bits.mii_rmii = GMAC_PHY_RGMII_1000; 310 netdev_dbg(netdev, "connect %s to RGMII @ 1Gbit\n", 311 phydev_name(phydev)); 312 break; 313 case 100: 314 status.bits.speed = GMAC_SPEED_100; 315 if (phy_interface_mode_is_rgmii(phydev->interface)) 316 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10; 317 netdev_dbg(netdev, "connect %s to RGMII @ 100 Mbit\n", 318 phydev_name(phydev)); 319 break; 320 case 10: 321 status.bits.speed = GMAC_SPEED_10; 322 if (phy_interface_mode_is_rgmii(phydev->interface)) 323 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10; 324 netdev_dbg(netdev, "connect %s to RGMII @ 10 Mbit\n", 325 phydev_name(phydev)); 326 break; 327 default: 328 netdev_warn(netdev, "Unsupported PHY speed (%d) on %s\n", 329 phydev->speed, phydev_name(phydev)); 330 } 331 332 if (phydev->duplex == DUPLEX_FULL) { 333 phy_get_pause(phydev, &pause_tx, &pause_rx); 334 netdev_dbg(netdev, "set negotiated pause params pause TX = %s, pause RX = %s\n", 335 pause_tx ? "ON" : "OFF", pause_rx ? "ON" : "OFF"); 336 } 337 338 gmac_set_flow_control(netdev, pause_tx, pause_rx); 339 340 if (old_status.bits32 == status.bits32) 341 return; 342 343 if (netif_msg_link(port)) { 344 phy_print_status(phydev); 345 netdev_info(netdev, "link flow control: %s\n", 346 phydev->pause 347 ? (phydev->asym_pause ? "tx" : "both") 348 : (phydev->asym_pause ? "rx" : "none") 349 ); 350 } 351 352 gmac_disable_tx_rx(netdev); 353 writel(status.bits32, port->gmac_base + GMAC_STATUS); 354 gmac_enable_tx_rx(netdev); 355 } 356 357 static int gmac_setup_phy(struct net_device *netdev) 358 { 359 struct gemini_ethernet_port *port = netdev_priv(netdev); 360 union gmac_status status = { .bits32 = 0 }; 361 struct device *dev = port->dev; 362 struct phy_device *phy; 363 364 phy = of_phy_get_and_connect(netdev, 365 dev->of_node, 366 gmac_adjust_link); 367 if (!phy) 368 return -ENODEV; 369 netdev->phydev = phy; 370 371 phy_set_max_speed(phy, SPEED_1000); 372 phy_support_asym_pause(phy); 373 374 /* set PHY interface type */ 375 switch (phy->interface) { 376 case PHY_INTERFACE_MODE_MII: 377 netdev_dbg(netdev, 378 "MII: set GMAC0 to GMII mode, GMAC1 disabled\n"); 379 status.bits.mii_rmii = GMAC_PHY_MII; 380 break; 381 case PHY_INTERFACE_MODE_GMII: 382 netdev_dbg(netdev, 383 "GMII: set GMAC0 to GMII mode, GMAC1 disabled\n"); 384 status.bits.mii_rmii = GMAC_PHY_GMII; 385 break; 386 case PHY_INTERFACE_MODE_RGMII: 387 case PHY_INTERFACE_MODE_RGMII_ID: 388 case PHY_INTERFACE_MODE_RGMII_TXID: 389 case PHY_INTERFACE_MODE_RGMII_RXID: 390 netdev_dbg(netdev, 391 "RGMII: set GMAC0 and GMAC1 to MII/RGMII mode\n"); 392 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10; 393 break; 394 default: 395 netdev_err(netdev, "Unsupported MII interface\n"); 396 phy_disconnect(phy); 397 netdev->phydev = NULL; 398 return -EINVAL; 399 } 400 writel(status.bits32, port->gmac_base + GMAC_STATUS); 401 402 if (netif_msg_link(port)) 403 phy_attached_info(phy); 404 405 return 0; 406 } 407 408 /* The maximum frame length is not logically enumerated in the 409 * hardware, so we do a table lookup to find the applicable max 410 * frame length. 411 */ 412 struct gmac_max_framelen { 413 unsigned int max_l3_len; 414 u8 val; 415 }; 416 417 static const struct gmac_max_framelen gmac_maxlens[] = { 418 { 419 .max_l3_len = 1518, 420 .val = CONFIG0_MAXLEN_1518, 421 }, 422 { 423 .max_l3_len = 1522, 424 .val = CONFIG0_MAXLEN_1522, 425 }, 426 { 427 .max_l3_len = 1536, 428 .val = CONFIG0_MAXLEN_1536, 429 }, 430 { 431 .max_l3_len = 1548, 432 .val = CONFIG0_MAXLEN_1548, 433 }, 434 { 435 .max_l3_len = 9212, 436 .val = CONFIG0_MAXLEN_9k, 437 }, 438 { 439 .max_l3_len = 10236, 440 .val = CONFIG0_MAXLEN_10k, 441 }, 442 }; 443 444 static int gmac_pick_rx_max_len(unsigned int max_l3_len) 445 { 446 const struct gmac_max_framelen *maxlen; 447 int maxtot; 448 int i; 449 450 maxtot = max_l3_len + ETH_HLEN + VLAN_HLEN; 451 452 for (i = 0; i < ARRAY_SIZE(gmac_maxlens); i++) { 453 maxlen = &gmac_maxlens[i]; 454 if (maxtot <= maxlen->max_l3_len) 455 return maxlen->val; 456 } 457 458 return -1; 459 } 460 461 static int gmac_init(struct net_device *netdev) 462 { 463 struct gemini_ethernet_port *port = netdev_priv(netdev); 464 union gmac_config0 config0 = { .bits = { 465 .dis_tx = 1, 466 .dis_rx = 1, 467 .ipv4_rx_chksum = 1, 468 .ipv6_rx_chksum = 1, 469 .rx_err_detect = 1, 470 .rgmm_edge = 1, 471 .port0_chk_hwq = 1, 472 .port1_chk_hwq = 1, 473 .port0_chk_toeq = 1, 474 .port1_chk_toeq = 1, 475 .port0_chk_classq = 1, 476 .port1_chk_classq = 1, 477 } }; 478 union gmac_ahb_weight ahb_weight = { .bits = { 479 .rx_weight = 1, 480 .tx_weight = 1, 481 .hash_weight = 1, 482 .pre_req = 0x1f, 483 .tq_dv_threshold = 0, 484 } }; 485 union gmac_tx_wcr0 hw_weigh = { .bits = { 486 .hw_tq3 = 1, 487 .hw_tq2 = 1, 488 .hw_tq1 = 1, 489 .hw_tq0 = 1, 490 } }; 491 union gmac_tx_wcr1 sw_weigh = { .bits = { 492 .sw_tq5 = 1, 493 .sw_tq4 = 1, 494 .sw_tq3 = 1, 495 .sw_tq2 = 1, 496 .sw_tq1 = 1, 497 .sw_tq0 = 1, 498 } }; 499 union gmac_config1 config1 = { .bits = { 500 .set_threshold = 16, 501 .rel_threshold = 24, 502 } }; 503 union gmac_config2 config2 = { .bits = { 504 .set_threshold = 16, 505 .rel_threshold = 32, 506 } }; 507 union gmac_config3 config3 = { .bits = { 508 .set_threshold = 0, 509 .rel_threshold = 0, 510 } }; 511 union gmac_config0 tmp; 512 513 config0.bits.max_len = gmac_pick_rx_max_len(netdev->mtu); 514 tmp.bits32 = readl(port->gmac_base + GMAC_CONFIG0); 515 config0.bits.reserved = tmp.bits.reserved; 516 writel(config0.bits32, port->gmac_base + GMAC_CONFIG0); 517 writel(config1.bits32, port->gmac_base + GMAC_CONFIG1); 518 writel(config2.bits32, port->gmac_base + GMAC_CONFIG2); 519 writel(config3.bits32, port->gmac_base + GMAC_CONFIG3); 520 521 readl(port->dma_base + GMAC_AHB_WEIGHT_REG); 522 writel(ahb_weight.bits32, port->dma_base + GMAC_AHB_WEIGHT_REG); 523 524 writel(hw_weigh.bits32, 525 port->dma_base + GMAC_TX_WEIGHTING_CTRL_0_REG); 526 writel(sw_weigh.bits32, 527 port->dma_base + GMAC_TX_WEIGHTING_CTRL_1_REG); 528 529 port->rxq_order = DEFAULT_GMAC_RXQ_ORDER; 530 port->txq_order = DEFAULT_GMAC_TXQ_ORDER; 531 port->rx_coalesce_nsecs = DEFAULT_RX_COALESCE_NSECS; 532 533 /* Mark every quarter of the queue a packet for interrupt 534 * in order to be able to wake up the queue if it was stopped 535 */ 536 port->irq_every_tx_packets = 1 << (port->txq_order - 2); 537 538 return 0; 539 } 540 541 static int gmac_setup_txqs(struct net_device *netdev) 542 { 543 struct gemini_ethernet_port *port = netdev_priv(netdev); 544 unsigned int n_txq = netdev->num_tx_queues; 545 struct gemini_ethernet *geth = port->geth; 546 size_t entries = 1 << port->txq_order; 547 struct gmac_txq *txq = port->txq; 548 struct gmac_txdesc *desc_ring; 549 size_t len = n_txq * entries; 550 struct sk_buff **skb_tab; 551 void __iomem *rwptr_reg; 552 unsigned int r; 553 int i; 554 555 rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG; 556 557 skb_tab = kzalloc_objs(*skb_tab, len); 558 if (!skb_tab) 559 return -ENOMEM; 560 561 desc_ring = dma_alloc_coherent(geth->dev, len * sizeof(*desc_ring), 562 &port->txq_dma_base, GFP_KERNEL); 563 564 if (!desc_ring) { 565 kfree(skb_tab); 566 return -ENOMEM; 567 } 568 569 if (port->txq_dma_base & ~DMA_Q_BASE_MASK) { 570 dev_warn(geth->dev, "TX queue base is not aligned\n"); 571 dma_free_coherent(geth->dev, len * sizeof(*desc_ring), 572 desc_ring, port->txq_dma_base); 573 kfree(skb_tab); 574 return -ENOMEM; 575 } 576 577 writel(port->txq_dma_base | port->txq_order, 578 port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG); 579 580 for (i = 0; i < n_txq; i++) { 581 txq->ring = desc_ring; 582 txq->skb = skb_tab; 583 txq->noirq_packets = 0; 584 585 r = readw(rwptr_reg); 586 rwptr_reg += 2; 587 writew(r, rwptr_reg); 588 rwptr_reg += 2; 589 txq->cptr = r; 590 591 txq++; 592 desc_ring += entries; 593 skb_tab += entries; 594 } 595 596 return 0; 597 } 598 599 static void gmac_clean_txq(struct net_device *netdev, struct gmac_txq *txq, 600 unsigned int r) 601 { 602 struct gemini_ethernet_port *port = netdev_priv(netdev); 603 unsigned int m = (1 << port->txq_order) - 1; 604 struct gemini_ethernet *geth = port->geth; 605 unsigned int c = txq->cptr; 606 union gmac_txdesc_0 word0; 607 union gmac_txdesc_1 word1; 608 unsigned int hwchksum = 0; 609 unsigned long bytes = 0; 610 struct gmac_txdesc *txd; 611 unsigned short nfrags; 612 unsigned int errs = 0; 613 unsigned int pkts = 0; 614 unsigned int word3; 615 dma_addr_t mapping; 616 617 if (c == r) 618 return; 619 620 while (c != r) { 621 txd = txq->ring + c; 622 word0 = txd->word0; 623 word1 = txd->word1; 624 mapping = txd->word2.buf_adr; 625 word3 = txd->word3.bits32; 626 627 dma_unmap_single(geth->dev, mapping, 628 word0.bits.buffer_size, DMA_TO_DEVICE); 629 630 if (word3 & EOF_BIT) 631 dev_kfree_skb(txq->skb[c]); 632 633 c++; 634 c &= m; 635 636 if (!(word3 & SOF_BIT)) 637 continue; 638 639 if (!word0.bits.status_tx_ok) { 640 errs++; 641 continue; 642 } 643 644 pkts++; 645 bytes += txd->word1.bits.byte_count; 646 647 if (word1.bits32 & TSS_CHECKUM_ENABLE) 648 hwchksum++; 649 650 nfrags = word0.bits.desc_count - 1; 651 if (nfrags) { 652 if (nfrags >= TX_MAX_FRAGS) 653 nfrags = TX_MAX_FRAGS - 1; 654 655 u64_stats_update_begin(&port->tx_stats_syncp); 656 port->tx_frag_stats[nfrags]++; 657 u64_stats_update_end(&port->tx_stats_syncp); 658 } 659 } 660 661 u64_stats_update_begin(&port->ir_stats_syncp); 662 port->stats.tx_errors += errs; 663 port->stats.tx_packets += pkts; 664 port->stats.tx_bytes += bytes; 665 port->tx_hw_csummed += hwchksum; 666 u64_stats_update_end(&port->ir_stats_syncp); 667 668 txq->cptr = c; 669 } 670 671 static void gmac_cleanup_txqs(struct net_device *netdev) 672 { 673 struct gemini_ethernet_port *port = netdev_priv(netdev); 674 unsigned int n_txq = netdev->num_tx_queues; 675 struct gemini_ethernet *geth = port->geth; 676 void __iomem *rwptr_reg; 677 unsigned int r, i; 678 679 rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG; 680 681 for (i = 0; i < n_txq; i++) { 682 r = readw(rwptr_reg); 683 rwptr_reg += 2; 684 writew(r, rwptr_reg); 685 rwptr_reg += 2; 686 687 gmac_clean_txq(netdev, port->txq + i, r); 688 } 689 writel(0, port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG); 690 691 kfree(port->txq->skb); 692 dma_free_coherent(geth->dev, 693 n_txq * sizeof(*port->txq->ring) << port->txq_order, 694 port->txq->ring, port->txq_dma_base); 695 } 696 697 static int gmac_setup_rxq(struct net_device *netdev) 698 { 699 struct gemini_ethernet_port *port = netdev_priv(netdev); 700 struct gemini_ethernet *geth = port->geth; 701 struct nontoe_qhdr __iomem *qhdr; 702 703 qhdr = geth->base + TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id); 704 port->rxq_rwptr = &qhdr->word1; 705 706 /* Remap a slew of memory to use for the RX queue */ 707 port->rxq_ring = dma_alloc_coherent(geth->dev, 708 sizeof(*port->rxq_ring) << port->rxq_order, 709 &port->rxq_dma_base, GFP_KERNEL); 710 if (!port->rxq_ring) 711 return -ENOMEM; 712 if (port->rxq_dma_base & ~NONTOE_QHDR0_BASE_MASK) { 713 dev_warn(geth->dev, "RX queue base is not aligned\n"); 714 return -ENOMEM; 715 } 716 717 writel(port->rxq_dma_base | port->rxq_order, &qhdr->word0); 718 writel(0, port->rxq_rwptr); 719 return 0; 720 } 721 722 static struct gmac_queue_page * 723 gmac_get_queue_page(struct gemini_ethernet *geth, 724 struct gemini_ethernet_port *port, 725 dma_addr_t addr) 726 { 727 struct gmac_queue_page *gpage; 728 dma_addr_t mapping; 729 int i; 730 731 /* Only look for even pages */ 732 mapping = addr & PAGE_MASK; 733 734 if (!geth->freeq_pages) { 735 dev_err(geth->dev, "try to get page with no page list\n"); 736 return NULL; 737 } 738 739 /* Look up a ring buffer page from virtual mapping */ 740 for (i = 0; i < geth->num_freeq_pages; i++) { 741 gpage = &geth->freeq_pages[i]; 742 if (gpage->mapping == mapping) 743 return gpage; 744 } 745 746 return NULL; 747 } 748 749 static void gmac_cleanup_rxq(struct net_device *netdev) 750 { 751 struct gemini_ethernet_port *port = netdev_priv(netdev); 752 struct gemini_ethernet *geth = port->geth; 753 struct gmac_rxdesc *rxd = port->rxq_ring; 754 static struct gmac_queue_page *gpage; 755 struct nontoe_qhdr __iomem *qhdr; 756 void __iomem *dma_reg; 757 void __iomem *ptr_reg; 758 dma_addr_t mapping; 759 union dma_rwptr rw; 760 unsigned int r, w; 761 762 qhdr = geth->base + 763 TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id); 764 dma_reg = &qhdr->word0; 765 ptr_reg = &qhdr->word1; 766 767 rw.bits32 = readl(ptr_reg); 768 r = rw.bits.rptr; 769 w = rw.bits.wptr; 770 writew(r, ptr_reg + 2); 771 772 writel(0, dma_reg); 773 774 /* Loop from read pointer to write pointer of the RX queue 775 * and free up all pages by the queue. 776 */ 777 while (r != w) { 778 mapping = rxd[r].word2.buf_adr; 779 r++; 780 r &= ((1 << port->rxq_order) - 1); 781 782 if (!mapping) 783 continue; 784 785 /* Freeq pointers are one page off */ 786 gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE); 787 if (!gpage) { 788 dev_err(geth->dev, "could not find page\n"); 789 continue; 790 } 791 /* Release the RX queue reference to the page */ 792 put_page(gpage->page); 793 } 794 795 dma_free_coherent(geth->dev, sizeof(*port->rxq_ring) << port->rxq_order, 796 port->rxq_ring, port->rxq_dma_base); 797 } 798 799 static struct page *geth_freeq_alloc_map_page(struct gemini_ethernet *geth, 800 int pn) 801 { 802 struct gmac_rxdesc *freeq_entry; 803 struct gmac_queue_page *gpage; 804 unsigned int fpp_order; 805 unsigned int frag_len; 806 dma_addr_t mapping; 807 struct page *page; 808 int i; 809 810 /* First allocate and DMA map a single page */ 811 page = alloc_page(GFP_ATOMIC); 812 if (!page) 813 return NULL; 814 815 mapping = dma_map_single(geth->dev, page_address(page), 816 PAGE_SIZE, DMA_FROM_DEVICE); 817 if (dma_mapping_error(geth->dev, mapping)) { 818 put_page(page); 819 return NULL; 820 } 821 822 /* The assign the page mapping (physical address) to the buffer address 823 * in the hardware queue. PAGE_SHIFT on ARM is 12 (1 page is 4096 bytes, 824 * 4k), and the default RX frag order is 11 (fragments are up 20 2048 825 * bytes, 2k) so fpp_order (fragments per page order) is default 1. Thus 826 * each page normally needs two entries in the queue. 827 */ 828 frag_len = 1 << geth->freeq_frag_order; /* Usually 2048 */ 829 fpp_order = PAGE_SHIFT - geth->freeq_frag_order; 830 freeq_entry = geth->freeq_ring + (pn << fpp_order); 831 dev_dbg(geth->dev, "allocate page %d fragment length %d fragments per page %d, freeq entry %p\n", 832 pn, frag_len, (1 << fpp_order), freeq_entry); 833 for (i = (1 << fpp_order); i > 0; i--) { 834 freeq_entry->word2.buf_adr = mapping; 835 freeq_entry++; 836 mapping += frag_len; 837 } 838 839 /* If the freeq entry already has a page mapped, then unmap it. */ 840 gpage = &geth->freeq_pages[pn]; 841 if (gpage->page) { 842 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr; 843 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE); 844 /* This should be the last reference to the page so it gets 845 * released 846 */ 847 put_page(gpage->page); 848 } 849 850 /* Then put our new mapping into the page table */ 851 dev_dbg(geth->dev, "page %d, DMA addr: %08x, page %p\n", 852 pn, (unsigned int)mapping, page); 853 gpage->mapping = mapping; 854 gpage->page = page; 855 856 return page; 857 } 858 859 /** 860 * geth_fill_freeq() - Fill the freeq with empty fragments to use 861 * @geth: the ethernet adapter 862 * @refill: whether to reset the queue by filling in all freeq entries or 863 * just refill it, usually the interrupt to refill the queue happens when 864 * the queue is half empty. 865 */ 866 static unsigned int geth_fill_freeq(struct gemini_ethernet *geth, bool refill) 867 { 868 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order; 869 unsigned int count = 0; 870 unsigned int pn, epn; 871 unsigned long flags; 872 union dma_rwptr rw; 873 unsigned int m_pn; 874 875 /* Mask for page */ 876 m_pn = (1 << (geth->freeq_order - fpp_order)) - 1; 877 878 spin_lock_irqsave(&geth->freeq_lock, flags); 879 880 rw.bits32 = readl(geth->base + GLOBAL_SWFQ_RWPTR_REG); 881 pn = (refill ? rw.bits.wptr : rw.bits.rptr) >> fpp_order; 882 epn = (rw.bits.rptr >> fpp_order) - 1; 883 epn &= m_pn; 884 885 /* Loop over the freeq ring buffer entries */ 886 while (pn != epn) { 887 struct gmac_queue_page *gpage; 888 struct page *page; 889 890 gpage = &geth->freeq_pages[pn]; 891 page = gpage->page; 892 893 dev_dbg(geth->dev, "fill entry %d page ref count %d add %d refs\n", 894 pn, page_ref_count(page), 1 << fpp_order); 895 896 if (page_ref_count(page) > 1) { 897 unsigned int fl = (pn - epn) & m_pn; 898 899 if (fl > 64 >> fpp_order) 900 break; 901 902 page = geth_freeq_alloc_map_page(geth, pn); 903 if (!page) 904 break; 905 } 906 907 /* Add one reference per fragment in the page */ 908 page_ref_add(page, 1 << fpp_order); 909 count += 1 << fpp_order; 910 pn++; 911 pn &= m_pn; 912 } 913 914 writew(pn << fpp_order, geth->base + GLOBAL_SWFQ_RWPTR_REG + 2); 915 916 spin_unlock_irqrestore(&geth->freeq_lock, flags); 917 918 return count; 919 } 920 921 static int geth_setup_freeq(struct gemini_ethernet *geth) 922 { 923 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order; 924 unsigned int frag_len = 1 << geth->freeq_frag_order; 925 unsigned int len = 1 << geth->freeq_order; 926 unsigned int pages = len >> fpp_order; 927 union queue_threshold qt; 928 union dma_skb_size skbsz; 929 unsigned int filled; 930 unsigned int pn; 931 932 geth->freeq_ring = dma_alloc_coherent(geth->dev, 933 sizeof(*geth->freeq_ring) << geth->freeq_order, 934 &geth->freeq_dma_base, GFP_KERNEL); 935 if (!geth->freeq_ring) 936 return -ENOMEM; 937 if (geth->freeq_dma_base & ~DMA_Q_BASE_MASK) { 938 dev_warn(geth->dev, "queue ring base is not aligned\n"); 939 goto err_freeq; 940 } 941 942 /* Allocate a mapping to page look-up index */ 943 geth->freeq_pages = kzalloc_objs(*geth->freeq_pages, pages); 944 if (!geth->freeq_pages) 945 goto err_freeq; 946 geth->num_freeq_pages = pages; 947 948 dev_info(geth->dev, "allocate %d pages for queue\n", pages); 949 for (pn = 0; pn < pages; pn++) 950 if (!geth_freeq_alloc_map_page(geth, pn)) 951 goto err_freeq_alloc; 952 953 filled = geth_fill_freeq(geth, false); 954 if (!filled) 955 goto err_freeq_alloc; 956 957 qt.bits32 = readl(geth->base + GLOBAL_QUEUE_THRESHOLD_REG); 958 qt.bits.swfq_empty = 32; 959 writel(qt.bits32, geth->base + GLOBAL_QUEUE_THRESHOLD_REG); 960 961 skbsz.bits.sw_skb_size = 1 << geth->freeq_frag_order; 962 writel(skbsz.bits32, geth->base + GLOBAL_DMA_SKB_SIZE_REG); 963 writel(geth->freeq_dma_base | geth->freeq_order, 964 geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG); 965 966 return 0; 967 968 err_freeq_alloc: 969 while (pn > 0) { 970 struct gmac_queue_page *gpage; 971 dma_addr_t mapping; 972 973 --pn; 974 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr; 975 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE); 976 gpage = &geth->freeq_pages[pn]; 977 put_page(gpage->page); 978 } 979 980 kfree(geth->freeq_pages); 981 err_freeq: 982 dma_free_coherent(geth->dev, 983 sizeof(*geth->freeq_ring) << geth->freeq_order, 984 geth->freeq_ring, geth->freeq_dma_base); 985 geth->freeq_ring = NULL; 986 return -ENOMEM; 987 } 988 989 /** 990 * geth_cleanup_freeq() - cleanup the DMA mappings and free the queue 991 * @geth: the Gemini global ethernet state 992 */ 993 static void geth_cleanup_freeq(struct gemini_ethernet *geth) 994 { 995 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order; 996 unsigned int frag_len = 1 << geth->freeq_frag_order; 997 unsigned int len = 1 << geth->freeq_order; 998 unsigned int pages = len >> fpp_order; 999 unsigned int pn; 1000 1001 writew(readw(geth->base + GLOBAL_SWFQ_RWPTR_REG), 1002 geth->base + GLOBAL_SWFQ_RWPTR_REG + 2); 1003 writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG); 1004 1005 for (pn = 0; pn < pages; pn++) { 1006 struct gmac_queue_page *gpage; 1007 dma_addr_t mapping; 1008 1009 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr; 1010 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE); 1011 1012 gpage = &geth->freeq_pages[pn]; 1013 while (page_ref_count(gpage->page) > 0) 1014 put_page(gpage->page); 1015 } 1016 1017 kfree(geth->freeq_pages); 1018 1019 dma_free_coherent(geth->dev, 1020 sizeof(*geth->freeq_ring) << geth->freeq_order, 1021 geth->freeq_ring, geth->freeq_dma_base); 1022 } 1023 1024 /** 1025 * geth_resize_freeq() - resize the software queue depth 1026 * @port: the port requesting the change 1027 * 1028 * This gets called at least once during probe() so the device queue gets 1029 * "resized" from the hardware defaults. Since both ports/net devices share 1030 * the same hardware queue, some synchronization between the ports is 1031 * needed. 1032 */ 1033 static int geth_resize_freeq(struct gemini_ethernet_port *port) 1034 { 1035 struct gemini_ethernet *geth = port->geth; 1036 struct net_device *netdev = port->netdev; 1037 struct gemini_ethernet_port *other_port; 1038 struct net_device *other_netdev; 1039 unsigned int new_size = 0; 1040 unsigned int new_order; 1041 unsigned long flags; 1042 u32 en; 1043 int ret; 1044 1045 if (netdev->dev_id == 0) 1046 other_netdev = geth->port1->netdev; 1047 else 1048 other_netdev = geth->port0->netdev; 1049 1050 if (other_netdev && netif_running(other_netdev)) 1051 return -EBUSY; 1052 1053 new_size = 1 << (port->rxq_order + 1); 1054 netdev_dbg(netdev, "port %d size: %d order %d\n", 1055 netdev->dev_id, 1056 new_size, 1057 port->rxq_order); 1058 if (other_netdev) { 1059 other_port = netdev_priv(other_netdev); 1060 new_size += 1 << (other_port->rxq_order + 1); 1061 netdev_dbg(other_netdev, "port %d size: %d order %d\n", 1062 other_netdev->dev_id, 1063 (1 << (other_port->rxq_order + 1)), 1064 other_port->rxq_order); 1065 } 1066 1067 new_order = min(15, ilog2(new_size - 1) + 1); 1068 dev_dbg(geth->dev, "set shared queue to size %d order %d\n", 1069 new_size, new_order); 1070 if (geth->freeq_order == new_order) 1071 return 0; 1072 1073 spin_lock_irqsave(&geth->irq_lock, flags); 1074 1075 /* Disable the software queue IRQs */ 1076 en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 1077 en &= ~SWFQ_EMPTY_INT_BIT; 1078 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 1079 spin_unlock_irqrestore(&geth->irq_lock, flags); 1080 1081 /* Drop the old queue */ 1082 if (geth->freeq_ring) 1083 geth_cleanup_freeq(geth); 1084 1085 /* Allocate a new queue with the desired order */ 1086 geth->freeq_order = new_order; 1087 ret = geth_setup_freeq(geth); 1088 1089 /* Restart the interrupts - NOTE if this is the first resize 1090 * after probe(), this is where the interrupts get turned on 1091 * in the first place. 1092 */ 1093 spin_lock_irqsave(&geth->irq_lock, flags); 1094 en |= SWFQ_EMPTY_INT_BIT; 1095 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 1096 spin_unlock_irqrestore(&geth->irq_lock, flags); 1097 1098 return ret; 1099 } 1100 1101 static void gmac_tx_irq_enable(struct net_device *netdev, 1102 unsigned int txq, int en) 1103 { 1104 struct gemini_ethernet_port *port = netdev_priv(netdev); 1105 struct gemini_ethernet *geth = port->geth; 1106 unsigned long flags; 1107 u32 val, mask; 1108 1109 netdev_dbg(netdev, "%s device %d\n", __func__, netdev->dev_id); 1110 1111 spin_lock_irqsave(&geth->irq_lock, flags); 1112 1113 mask = GMAC0_IRQ0_TXQ0_INTS << (6 * netdev->dev_id + txq); 1114 1115 if (en) 1116 writel(mask, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG); 1117 1118 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG); 1119 val = en ? val | mask : val & ~mask; 1120 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG); 1121 1122 spin_unlock_irqrestore(&geth->irq_lock, flags); 1123 } 1124 1125 static void gmac_tx_irq(struct net_device *netdev, unsigned int txq_num) 1126 { 1127 struct netdev_queue *ntxq = netdev_get_tx_queue(netdev, txq_num); 1128 1129 gmac_tx_irq_enable(netdev, txq_num, 0); 1130 netif_tx_wake_queue(ntxq); 1131 } 1132 1133 static int gmac_map_tx_bufs(struct net_device *netdev, struct sk_buff *skb, 1134 struct gmac_txq *txq, unsigned short *desc) 1135 { 1136 struct gemini_ethernet_port *port = netdev_priv(netdev); 1137 struct skb_shared_info *skb_si = skb_shinfo(skb); 1138 unsigned short m = (1 << port->txq_order) - 1; 1139 short frag, last_frag = skb_si->nr_frags - 1; 1140 struct gemini_ethernet *geth = port->geth; 1141 unsigned int word1, word3, buflen; 1142 unsigned short w = *desc; 1143 struct gmac_txdesc *txd; 1144 skb_frag_t *skb_frag; 1145 dma_addr_t mapping; 1146 bool tcp = false; 1147 void *buffer; 1148 u16 mss; 1149 int ret; 1150 1151 word1 = skb->len; 1152 word3 = SOF_BIT; 1153 1154 /* Determine if we are doing TCP */ 1155 if (skb->protocol == htons(ETH_P_IP)) 1156 tcp = (ip_hdr(skb)->protocol == IPPROTO_TCP); 1157 else 1158 /* IPv6 */ 1159 tcp = (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP); 1160 1161 mss = skb_shinfo(skb)->gso_size; 1162 if (mss) { 1163 /* This means we are dealing with TCP and skb->len is the 1164 * sum total of all the segments. The TSO will deal with 1165 * chopping this up for us. 1166 */ 1167 /* The accelerator needs the full frame size here */ 1168 mss += skb_tcp_all_headers(skb); 1169 netdev_dbg(netdev, "segment offloading mss = %04x len=%04x\n", 1170 mss, skb->len); 1171 word1 |= TSS_MTU_ENABLE_BIT; 1172 word3 |= mss; 1173 } else if (tcp) { 1174 /* Even if we are not using TSO, use the hardware offloader 1175 * for transferring the TCP frame: this hardware has partial 1176 * TCP awareness (called TOE - TCP Offload Engine) and will 1177 * according to the datasheet put packets belonging to the 1178 * same TCP connection in the same queue for the TOE/TSO 1179 * engine to process. The engine will deal with chopping 1180 * up frames that exceed ETH_DATA_LEN which the 1181 * checksumming engine cannot handle (see below) into 1182 * manageable chunks. It flawlessly deals with quite big 1183 * frames and frames containing custom DSA EtherTypes. 1184 */ 1185 mss = netdev->mtu + skb_tcp_all_headers(skb); 1186 mss = min(mss, skb->len); 1187 netdev_dbg(netdev, "TOE/TSO len %04x mtu %04x mss %04x\n", 1188 skb->len, netdev->mtu, mss); 1189 word1 |= TSS_MTU_ENABLE_BIT; 1190 word3 |= mss; 1191 } else if (skb->len >= ETH_FRAME_LEN) { 1192 /* Hardware offloaded checksumming isn't working on non-TCP frames 1193 * bigger than 1514 bytes. A hypothesis about this is that the 1194 * checksum buffer is only 1518 bytes, so when the frames get 1195 * bigger they get truncated, or the last few bytes get 1196 * overwritten by the FCS. 1197 * 1198 * Just use software checksumming and bypass on bigger frames. 1199 */ 1200 if (skb->ip_summed == CHECKSUM_PARTIAL) { 1201 ret = skb_checksum_help(skb); 1202 if (ret) 1203 return ret; 1204 } 1205 word1 |= TSS_BYPASS_BIT; 1206 } 1207 1208 if (skb->ip_summed == CHECKSUM_PARTIAL) { 1209 /* We do not switch off the checksumming on non TCP/UDP 1210 * frames: as is shown from tests, the checksumming engine 1211 * is smart enough to see that a frame is not actually TCP 1212 * or UDP and then just pass it through without any changes 1213 * to the frame. 1214 */ 1215 if (skb->protocol == htons(ETH_P_IP)) 1216 word1 |= TSS_IP_CHKSUM_BIT; 1217 else 1218 word1 |= TSS_IPV6_ENABLE_BIT; 1219 1220 word1 |= tcp ? TSS_TCP_CHKSUM_BIT : TSS_UDP_CHKSUM_BIT; 1221 } 1222 1223 frag = -1; 1224 while (frag <= last_frag) { 1225 if (frag == -1) { 1226 buffer = skb->data; 1227 buflen = skb_headlen(skb); 1228 } else { 1229 skb_frag = skb_si->frags + frag; 1230 buffer = skb_frag_address(skb_frag); 1231 buflen = skb_frag_size(skb_frag); 1232 } 1233 1234 if (frag == last_frag) { 1235 word3 |= EOF_BIT; 1236 txq->skb[w] = skb; 1237 } 1238 1239 mapping = dma_map_single(geth->dev, buffer, buflen, 1240 DMA_TO_DEVICE); 1241 if (dma_mapping_error(geth->dev, mapping)) 1242 goto map_error; 1243 1244 txd = txq->ring + w; 1245 txd->word0.bits32 = buflen; 1246 txd->word1.bits32 = word1; 1247 txd->word2.buf_adr = mapping; 1248 txd->word3.bits32 = word3; 1249 1250 word3 &= MTU_SIZE_BIT_MASK; 1251 w++; 1252 w &= m; 1253 frag++; 1254 } 1255 1256 *desc = w; 1257 return 0; 1258 1259 map_error: 1260 while (w != *desc) { 1261 w--; 1262 w &= m; 1263 1264 dma_unmap_page(geth->dev, txq->ring[w].word2.buf_adr, 1265 txq->ring[w].word0.bits.buffer_size, 1266 DMA_TO_DEVICE); 1267 } 1268 return -ENOMEM; 1269 } 1270 1271 static netdev_tx_t gmac_start_xmit(struct sk_buff *skb, 1272 struct net_device *netdev) 1273 { 1274 struct gemini_ethernet_port *port = netdev_priv(netdev); 1275 unsigned short m = (1 << port->txq_order) - 1; 1276 struct netdev_queue *ntxq; 1277 unsigned short r, w, d; 1278 void __iomem *ptr_reg; 1279 struct gmac_txq *txq; 1280 int txq_num, nfrags; 1281 union dma_rwptr rw; 1282 1283 if (skb->len >= 0x10000) 1284 goto out_drop_free; 1285 1286 txq_num = skb_get_queue_mapping(skb); 1287 ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE_PTR_REG(txq_num); 1288 txq = &port->txq[txq_num]; 1289 ntxq = netdev_get_tx_queue(netdev, txq_num); 1290 nfrags = skb_shinfo(skb)->nr_frags; 1291 1292 rw.bits32 = readl(ptr_reg); 1293 r = rw.bits.rptr; 1294 w = rw.bits.wptr; 1295 1296 d = txq->cptr - w - 1; 1297 d &= m; 1298 1299 if (d < nfrags + 2) { 1300 gmac_clean_txq(netdev, txq, r); 1301 d = txq->cptr - w - 1; 1302 d &= m; 1303 1304 if (d < nfrags + 2) { 1305 netif_tx_stop_queue(ntxq); 1306 1307 d = txq->cptr + nfrags + 16; 1308 d &= m; 1309 txq->ring[d].word3.bits.eofie = 1; 1310 gmac_tx_irq_enable(netdev, txq_num, 1); 1311 1312 u64_stats_update_begin(&port->tx_stats_syncp); 1313 netdev->stats.tx_fifo_errors++; 1314 u64_stats_update_end(&port->tx_stats_syncp); 1315 return NETDEV_TX_BUSY; 1316 } 1317 } 1318 1319 if (gmac_map_tx_bufs(netdev, skb, txq, &w)) { 1320 if (skb_linearize(skb)) 1321 goto out_drop; 1322 1323 u64_stats_update_begin(&port->tx_stats_syncp); 1324 port->tx_frags_linearized++; 1325 u64_stats_update_end(&port->tx_stats_syncp); 1326 1327 if (gmac_map_tx_bufs(netdev, skb, txq, &w)) 1328 goto out_drop_free; 1329 } 1330 1331 writew(w, ptr_reg + 2); 1332 1333 gmac_clean_txq(netdev, txq, r); 1334 return NETDEV_TX_OK; 1335 1336 out_drop_free: 1337 dev_kfree_skb(skb); 1338 out_drop: 1339 u64_stats_update_begin(&port->tx_stats_syncp); 1340 port->stats.tx_dropped++; 1341 u64_stats_update_end(&port->tx_stats_syncp); 1342 return NETDEV_TX_OK; 1343 } 1344 1345 static void gmac_tx_timeout(struct net_device *netdev, unsigned int txqueue) 1346 { 1347 netdev_err(netdev, "Tx timeout\n"); 1348 gmac_dump_dma_state(netdev); 1349 } 1350 1351 static void gmac_enable_irq(struct net_device *netdev, int enable) 1352 { 1353 struct gemini_ethernet_port *port = netdev_priv(netdev); 1354 struct gemini_ethernet *geth = port->geth; 1355 unsigned long flags; 1356 u32 val, mask; 1357 1358 netdev_dbg(netdev, "%s device %d %s\n", __func__, 1359 netdev->dev_id, enable ? "enable" : "disable"); 1360 spin_lock_irqsave(&geth->irq_lock, flags); 1361 1362 mask = GMAC0_IRQ0_2 << (netdev->dev_id * 2); 1363 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG); 1364 val = enable ? (val | mask) : (val & ~mask); 1365 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG); 1366 1367 mask = DEFAULT_Q0_INT_BIT << netdev->dev_id; 1368 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG); 1369 val = enable ? (val | mask) : (val & ~mask); 1370 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG); 1371 1372 mask = GMAC0_IRQ4_8 << (netdev->dev_id * 8); 1373 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 1374 val = enable ? (val | mask) : (val & ~mask); 1375 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 1376 1377 spin_unlock_irqrestore(&geth->irq_lock, flags); 1378 } 1379 1380 static void gmac_enable_rx_irq(struct net_device *netdev, int enable) 1381 { 1382 struct gemini_ethernet_port *port = netdev_priv(netdev); 1383 struct gemini_ethernet *geth = port->geth; 1384 unsigned long flags; 1385 u32 val, mask; 1386 1387 netdev_dbg(netdev, "%s device %d %s\n", __func__, netdev->dev_id, 1388 enable ? "enable" : "disable"); 1389 spin_lock_irqsave(&geth->irq_lock, flags); 1390 mask = DEFAULT_Q0_INT_BIT << netdev->dev_id; 1391 1392 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG); 1393 val = enable ? (val | mask) : (val & ~mask); 1394 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG); 1395 1396 spin_unlock_irqrestore(&geth->irq_lock, flags); 1397 } 1398 1399 static struct sk_buff *gmac_skb_if_good_frame(struct gemini_ethernet_port *port, 1400 union gmac_rxdesc_0 word0, 1401 unsigned int frame_len) 1402 { 1403 unsigned int rx_csum = word0.bits.chksum_status; 1404 unsigned int rx_status = word0.bits.status; 1405 struct sk_buff *skb = NULL; 1406 1407 port->rx_stats[rx_status]++; 1408 port->rx_csum_stats[rx_csum]++; 1409 1410 if (word0.bits.derr || word0.bits.perr || 1411 rx_status || frame_len < ETH_ZLEN || 1412 rx_csum >= RX_CHKSUM_IP_ERR_UNKNOWN) { 1413 port->stats.rx_errors++; 1414 1415 if (frame_len < ETH_ZLEN || RX_ERROR_LENGTH(rx_status)) 1416 port->stats.rx_length_errors++; 1417 if (RX_ERROR_OVER(rx_status)) 1418 port->stats.rx_over_errors++; 1419 if (RX_ERROR_CRC(rx_status)) 1420 port->stats.rx_crc_errors++; 1421 if (RX_ERROR_FRAME(rx_status)) 1422 port->stats.rx_frame_errors++; 1423 return NULL; 1424 } 1425 1426 skb = napi_get_frags(&port->napi); 1427 if (!skb) 1428 goto update_exit; 1429 1430 if (rx_csum == RX_CHKSUM_IP_UDP_TCP_OK) 1431 skb->ip_summed = CHECKSUM_UNNECESSARY; 1432 1433 update_exit: 1434 port->stats.rx_bytes += frame_len; 1435 port->stats.rx_packets++; 1436 return skb; 1437 } 1438 1439 static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget) 1440 { 1441 struct gemini_ethernet_port *port = netdev_priv(netdev); 1442 unsigned short m = (1 << port->rxq_order) - 1; 1443 struct gemini_ethernet *geth = port->geth; 1444 void __iomem *ptr_reg = port->rxq_rwptr; 1445 unsigned int frame_len, frag_len; 1446 struct gmac_rxdesc *rx = NULL; 1447 struct gmac_queue_page *gpage; 1448 static struct sk_buff *skb; 1449 union gmac_rxdesc_0 word0; 1450 union gmac_rxdesc_1 word1; 1451 union gmac_rxdesc_3 word3; 1452 struct page *page = NULL; 1453 unsigned int page_offs; 1454 unsigned long flags; 1455 unsigned short r, w; 1456 union dma_rwptr rw; 1457 dma_addr_t mapping; 1458 int frag_nr = 0; 1459 1460 spin_lock_irqsave(&geth->irq_lock, flags); 1461 rw.bits32 = readl(ptr_reg); 1462 /* Reset interrupt as all packages until here are taken into account */ 1463 writel(DEFAULT_Q0_INT_BIT << netdev->dev_id, 1464 geth->base + GLOBAL_INTERRUPT_STATUS_1_REG); 1465 spin_unlock_irqrestore(&geth->irq_lock, flags); 1466 1467 r = rw.bits.rptr; 1468 w = rw.bits.wptr; 1469 1470 while (budget && w != r) { 1471 rx = port->rxq_ring + r; 1472 word0 = rx->word0; 1473 word1 = rx->word1; 1474 mapping = rx->word2.buf_adr; 1475 word3 = rx->word3; 1476 1477 r++; 1478 r &= m; 1479 1480 frag_len = word0.bits.buffer_size; 1481 frame_len = word1.bits.byte_count; 1482 page_offs = mapping & ~PAGE_MASK; 1483 1484 if (!mapping) { 1485 netdev_err(netdev, 1486 "rxq[%u]: HW BUG: zero DMA desc\n", r); 1487 goto err_drop; 1488 } 1489 1490 /* Freeq pointers are one page off */ 1491 gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE); 1492 if (!gpage) { 1493 dev_err(geth->dev, "could not find mapping\n"); 1494 continue; 1495 } 1496 page = gpage->page; 1497 1498 if (word3.bits32 & SOF_BIT) { 1499 if (skb) { 1500 napi_free_frags(&port->napi); 1501 port->stats.rx_dropped++; 1502 } 1503 1504 skb = gmac_skb_if_good_frame(port, word0, frame_len); 1505 if (!skb) 1506 goto err_drop; 1507 1508 page_offs += NET_IP_ALIGN; 1509 frag_len -= NET_IP_ALIGN; 1510 frag_nr = 0; 1511 1512 } else if (!skb) { 1513 put_page(page); 1514 continue; 1515 } 1516 1517 if (word3.bits32 & EOF_BIT) 1518 frag_len = frame_len - skb->len; 1519 1520 /* append page frag to skb */ 1521 if (frag_nr == MAX_SKB_FRAGS) 1522 goto err_drop; 1523 1524 if (frag_len == 0) 1525 netdev_err(netdev, "Received fragment with len = 0\n"); 1526 1527 skb_fill_page_desc(skb, frag_nr, page, page_offs, frag_len); 1528 skb->len += frag_len; 1529 skb->data_len += frag_len; 1530 skb->truesize += frag_len; 1531 frag_nr++; 1532 1533 if (word3.bits32 & EOF_BIT) { 1534 napi_gro_frags(&port->napi); 1535 skb = NULL; 1536 --budget; 1537 } 1538 continue; 1539 1540 err_drop: 1541 if (skb) { 1542 napi_free_frags(&port->napi); 1543 skb = NULL; 1544 } 1545 1546 if (mapping) 1547 put_page(page); 1548 1549 port->stats.rx_dropped++; 1550 } 1551 1552 writew(r, ptr_reg); 1553 return budget; 1554 } 1555 1556 static int gmac_napi_poll(struct napi_struct *napi, int budget) 1557 { 1558 struct gemini_ethernet_port *port = netdev_priv(napi->dev); 1559 struct gemini_ethernet *geth = port->geth; 1560 unsigned int freeq_threshold; 1561 unsigned int received; 1562 1563 freeq_threshold = 1 << (geth->freeq_order - 1); 1564 u64_stats_update_begin(&port->rx_stats_syncp); 1565 1566 received = gmac_rx(napi->dev, budget); 1567 if (received < budget) { 1568 napi_gro_flush(napi, false); 1569 napi_complete_done(napi, received); 1570 gmac_enable_rx_irq(napi->dev, 1); 1571 ++port->rx_napi_exits; 1572 } 1573 1574 port->freeq_refill += (budget - received); 1575 if (port->freeq_refill > freeq_threshold) { 1576 port->freeq_refill -= freeq_threshold; 1577 geth_fill_freeq(geth, true); 1578 } 1579 1580 u64_stats_update_end(&port->rx_stats_syncp); 1581 return received; 1582 } 1583 1584 static void gmac_dump_dma_state(struct net_device *netdev) 1585 { 1586 struct gemini_ethernet_port *port = netdev_priv(netdev); 1587 struct gemini_ethernet *geth = port->geth; 1588 void __iomem *ptr_reg; 1589 u32 reg[5]; 1590 1591 /* Interrupt status */ 1592 reg[0] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_0_REG); 1593 reg[1] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_1_REG); 1594 reg[2] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_2_REG); 1595 reg[3] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_3_REG); 1596 reg[4] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG); 1597 netdev_err(netdev, "IRQ status: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n", 1598 reg[0], reg[1], reg[2], reg[3], reg[4]); 1599 1600 /* Interrupt enable */ 1601 reg[0] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG); 1602 reg[1] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG); 1603 reg[2] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG); 1604 reg[3] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG); 1605 reg[4] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 1606 netdev_err(netdev, "IRQ enable: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n", 1607 reg[0], reg[1], reg[2], reg[3], reg[4]); 1608 1609 /* RX DMA status */ 1610 reg[0] = readl(port->dma_base + GMAC_DMA_RX_FIRST_DESC_REG); 1611 reg[1] = readl(port->dma_base + GMAC_DMA_RX_CURR_DESC_REG); 1612 reg[2] = GET_RPTR(port->rxq_rwptr); 1613 reg[3] = GET_WPTR(port->rxq_rwptr); 1614 netdev_err(netdev, "RX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n", 1615 reg[0], reg[1], reg[2], reg[3]); 1616 1617 reg[0] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD0_REG); 1618 reg[1] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD1_REG); 1619 reg[2] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD2_REG); 1620 reg[3] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD3_REG); 1621 netdev_err(netdev, "RX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n", 1622 reg[0], reg[1], reg[2], reg[3]); 1623 1624 /* TX DMA status */ 1625 ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG; 1626 1627 reg[0] = readl(port->dma_base + GMAC_DMA_TX_FIRST_DESC_REG); 1628 reg[1] = readl(port->dma_base + GMAC_DMA_TX_CURR_DESC_REG); 1629 reg[2] = GET_RPTR(ptr_reg); 1630 reg[3] = GET_WPTR(ptr_reg); 1631 netdev_err(netdev, "TX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n", 1632 reg[0], reg[1], reg[2], reg[3]); 1633 1634 reg[0] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD0_REG); 1635 reg[1] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD1_REG); 1636 reg[2] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD2_REG); 1637 reg[3] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD3_REG); 1638 netdev_err(netdev, "TX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n", 1639 reg[0], reg[1], reg[2], reg[3]); 1640 1641 /* FREE queues status */ 1642 ptr_reg = geth->base + GLOBAL_SWFQ_RWPTR_REG; 1643 1644 reg[0] = GET_RPTR(ptr_reg); 1645 reg[1] = GET_WPTR(ptr_reg); 1646 1647 ptr_reg = geth->base + GLOBAL_HWFQ_RWPTR_REG; 1648 1649 reg[2] = GET_RPTR(ptr_reg); 1650 reg[3] = GET_WPTR(ptr_reg); 1651 netdev_err(netdev, "FQ SW ptr: %u %u, HW ptr: %u %u\n", 1652 reg[0], reg[1], reg[2], reg[3]); 1653 } 1654 1655 static void gmac_update_hw_stats(struct net_device *netdev) 1656 { 1657 struct gemini_ethernet_port *port = netdev_priv(netdev); 1658 unsigned int rx_discards, rx_mcast, rx_bcast; 1659 struct gemini_ethernet *geth = port->geth; 1660 unsigned long flags; 1661 1662 spin_lock_irqsave(&geth->irq_lock, flags); 1663 u64_stats_update_begin(&port->ir_stats_syncp); 1664 1665 rx_discards = readl(port->gmac_base + GMAC_IN_DISCARDS); 1666 port->hw_stats[0] += rx_discards; 1667 port->hw_stats[1] += readl(port->gmac_base + GMAC_IN_ERRORS); 1668 rx_mcast = readl(port->gmac_base + GMAC_IN_MCAST); 1669 port->hw_stats[2] += rx_mcast; 1670 rx_bcast = readl(port->gmac_base + GMAC_IN_BCAST); 1671 port->hw_stats[3] += rx_bcast; 1672 port->hw_stats[4] += readl(port->gmac_base + GMAC_IN_MAC1); 1673 port->hw_stats[5] += readl(port->gmac_base + GMAC_IN_MAC2); 1674 1675 port->stats.rx_missed_errors += rx_discards; 1676 port->stats.multicast += rx_mcast; 1677 port->stats.multicast += rx_bcast; 1678 1679 writel(GMAC0_MIB_INT_BIT << (netdev->dev_id * 8), 1680 geth->base + GLOBAL_INTERRUPT_STATUS_4_REG); 1681 1682 u64_stats_update_end(&port->ir_stats_syncp); 1683 spin_unlock_irqrestore(&geth->irq_lock, flags); 1684 } 1685 1686 /** 1687 * gmac_get_intr_flags() - get interrupt status flags for a port from 1688 * @netdev: the net device for the port to get flags from 1689 * @i: the interrupt status register 0..4 1690 */ 1691 static u32 gmac_get_intr_flags(struct net_device *netdev, int i) 1692 { 1693 struct gemini_ethernet_port *port = netdev_priv(netdev); 1694 struct gemini_ethernet *geth = port->geth; 1695 void __iomem *irqif_reg, *irqen_reg; 1696 unsigned int offs, val; 1697 1698 /* Calculate the offset using the stride of the status registers */ 1699 offs = i * (GLOBAL_INTERRUPT_STATUS_1_REG - 1700 GLOBAL_INTERRUPT_STATUS_0_REG); 1701 1702 irqif_reg = geth->base + GLOBAL_INTERRUPT_STATUS_0_REG + offs; 1703 irqen_reg = geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG + offs; 1704 1705 val = readl(irqif_reg) & readl(irqen_reg); 1706 return val; 1707 } 1708 1709 static enum hrtimer_restart gmac_coalesce_delay_expired(struct hrtimer *timer) 1710 { 1711 struct gemini_ethernet_port *port = 1712 container_of(timer, struct gemini_ethernet_port, 1713 rx_coalesce_timer); 1714 1715 napi_schedule(&port->napi); 1716 return HRTIMER_NORESTART; 1717 } 1718 1719 static irqreturn_t gmac_irq(int irq, void *data) 1720 { 1721 struct gemini_ethernet_port *port; 1722 struct net_device *netdev = data; 1723 struct gemini_ethernet *geth; 1724 u32 val, orr = 0; 1725 1726 port = netdev_priv(netdev); 1727 geth = port->geth; 1728 1729 val = gmac_get_intr_flags(netdev, 0); 1730 orr |= val; 1731 1732 if (val & (GMAC0_IRQ0_2 << (netdev->dev_id * 2))) { 1733 /* Oh, crap */ 1734 netdev_err(netdev, "hw failure/sw bug\n"); 1735 gmac_dump_dma_state(netdev); 1736 1737 /* don't know how to recover, just reduce losses */ 1738 gmac_enable_irq(netdev, 0); 1739 return IRQ_HANDLED; 1740 } 1741 1742 if (val & (GMAC0_IRQ0_TXQ0_INTS << (netdev->dev_id * 6))) 1743 gmac_tx_irq(netdev, 0); 1744 1745 val = gmac_get_intr_flags(netdev, 1); 1746 orr |= val; 1747 1748 if (val & (DEFAULT_Q0_INT_BIT << netdev->dev_id)) { 1749 gmac_enable_rx_irq(netdev, 0); 1750 1751 if (!port->rx_coalesce_nsecs) { 1752 napi_schedule(&port->napi); 1753 } else { 1754 ktime_t ktime; 1755 1756 ktime = ktime_set(0, port->rx_coalesce_nsecs); 1757 hrtimer_start(&port->rx_coalesce_timer, ktime, 1758 HRTIMER_MODE_REL); 1759 } 1760 } 1761 1762 val = gmac_get_intr_flags(netdev, 4); 1763 orr |= val; 1764 1765 if (val & (GMAC0_MIB_INT_BIT << (netdev->dev_id * 8))) 1766 gmac_update_hw_stats(netdev); 1767 1768 if (val & (GMAC0_RX_OVERRUN_INT_BIT << (netdev->dev_id * 8))) { 1769 spin_lock(&geth->irq_lock); 1770 writel(GMAC0_RXDERR_INT_BIT << (netdev->dev_id * 8), 1771 geth->base + GLOBAL_INTERRUPT_STATUS_4_REG); 1772 u64_stats_update_begin(&port->ir_stats_syncp); 1773 ++port->stats.rx_fifo_errors; 1774 u64_stats_update_end(&port->ir_stats_syncp); 1775 spin_unlock(&geth->irq_lock); 1776 } 1777 1778 return orr ? IRQ_HANDLED : IRQ_NONE; 1779 } 1780 1781 static void gmac_start_dma(struct gemini_ethernet_port *port) 1782 { 1783 void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG; 1784 union gmac_dma_ctrl dma_ctrl; 1785 1786 dma_ctrl.bits32 = readl(dma_ctrl_reg); 1787 dma_ctrl.bits.rd_enable = 1; 1788 dma_ctrl.bits.td_enable = 1; 1789 dma_ctrl.bits.loopback = 0; 1790 dma_ctrl.bits.drop_small_ack = 0; 1791 dma_ctrl.bits.rd_insert_bytes = NET_IP_ALIGN; 1792 dma_ctrl.bits.rd_prot = HPROT_DATA_CACHE | HPROT_PRIVILIGED; 1793 dma_ctrl.bits.rd_burst_size = HBURST_INCR8; 1794 dma_ctrl.bits.rd_bus = HSIZE_8; 1795 dma_ctrl.bits.td_prot = HPROT_DATA_CACHE; 1796 dma_ctrl.bits.td_burst_size = HBURST_INCR8; 1797 dma_ctrl.bits.td_bus = HSIZE_8; 1798 1799 writel(dma_ctrl.bits32, dma_ctrl_reg); 1800 } 1801 1802 static void gmac_stop_dma(struct gemini_ethernet_port *port) 1803 { 1804 void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG; 1805 union gmac_dma_ctrl dma_ctrl; 1806 1807 dma_ctrl.bits32 = readl(dma_ctrl_reg); 1808 dma_ctrl.bits.rd_enable = 0; 1809 dma_ctrl.bits.td_enable = 0; 1810 writel(dma_ctrl.bits32, dma_ctrl_reg); 1811 } 1812 1813 static int gmac_open(struct net_device *netdev) 1814 { 1815 struct gemini_ethernet_port *port = netdev_priv(netdev); 1816 int err; 1817 1818 err = request_irq(netdev->irq, gmac_irq, 1819 IRQF_SHARED, netdev->name, netdev); 1820 if (err) { 1821 netdev_err(netdev, "no IRQ\n"); 1822 return err; 1823 } 1824 1825 netif_carrier_off(netdev); 1826 phy_start(netdev->phydev); 1827 1828 err = geth_resize_freeq(port); 1829 /* It's fine if it's just busy, the other port has set up 1830 * the freeq in that case. 1831 */ 1832 if (err && (err != -EBUSY)) { 1833 netdev_err(netdev, "could not resize freeq\n"); 1834 goto err_stop_phy; 1835 } 1836 1837 err = gmac_setup_rxq(netdev); 1838 if (err) { 1839 netdev_err(netdev, "could not setup RXQ\n"); 1840 goto err_stop_phy; 1841 } 1842 1843 err = gmac_setup_txqs(netdev); 1844 if (err) { 1845 netdev_err(netdev, "could not setup TXQs\n"); 1846 gmac_cleanup_rxq(netdev); 1847 goto err_stop_phy; 1848 } 1849 1850 napi_enable(&port->napi); 1851 1852 gmac_start_dma(port); 1853 gmac_enable_irq(netdev, 1); 1854 gmac_enable_tx_rx(netdev); 1855 netif_tx_start_all_queues(netdev); 1856 1857 hrtimer_setup(&port->rx_coalesce_timer, &gmac_coalesce_delay_expired, CLOCK_MONOTONIC, 1858 HRTIMER_MODE_REL); 1859 1860 netdev_dbg(netdev, "opened\n"); 1861 1862 return 0; 1863 1864 err_stop_phy: 1865 phy_stop(netdev->phydev); 1866 free_irq(netdev->irq, netdev); 1867 return err; 1868 } 1869 1870 static int gmac_stop(struct net_device *netdev) 1871 { 1872 struct gemini_ethernet_port *port = netdev_priv(netdev); 1873 1874 hrtimer_cancel(&port->rx_coalesce_timer); 1875 netif_tx_stop_all_queues(netdev); 1876 gmac_disable_tx_rx(netdev); 1877 gmac_stop_dma(port); 1878 napi_disable(&port->napi); 1879 1880 gmac_enable_irq(netdev, 0); 1881 gmac_cleanup_rxq(netdev); 1882 gmac_cleanup_txqs(netdev); 1883 1884 phy_stop(netdev->phydev); 1885 free_irq(netdev->irq, netdev); 1886 1887 gmac_update_hw_stats(netdev); 1888 return 0; 1889 } 1890 1891 static void gmac_set_rx_mode(struct net_device *netdev) 1892 { 1893 struct gemini_ethernet_port *port = netdev_priv(netdev); 1894 union gmac_rx_fltr filter = { .bits = { 1895 .broadcast = 1, 1896 .multicast = 1, 1897 .unicast = 1, 1898 } }; 1899 struct netdev_hw_addr *ha; 1900 unsigned int bit_nr; 1901 u32 mc_filter[2]; 1902 1903 mc_filter[1] = 0; 1904 mc_filter[0] = 0; 1905 1906 if (netdev->flags & IFF_PROMISC) { 1907 filter.bits.error = 1; 1908 filter.bits.promiscuous = 1; 1909 mc_filter[1] = ~0; 1910 mc_filter[0] = ~0; 1911 } else if (netdev->flags & IFF_ALLMULTI) { 1912 mc_filter[1] = ~0; 1913 mc_filter[0] = ~0; 1914 } else { 1915 netdev_for_each_mc_addr(ha, netdev) { 1916 bit_nr = ~crc32_le(~0, ha->addr, ETH_ALEN) & 0x3f; 1917 mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 0x1f); 1918 } 1919 } 1920 1921 writel(mc_filter[0], port->gmac_base + GMAC_MCAST_FIL0); 1922 writel(mc_filter[1], port->gmac_base + GMAC_MCAST_FIL1); 1923 writel(filter.bits32, port->gmac_base + GMAC_RX_FLTR); 1924 } 1925 1926 static void gmac_write_mac_address(struct net_device *netdev) 1927 { 1928 struct gemini_ethernet_port *port = netdev_priv(netdev); 1929 __le32 addr[3]; 1930 1931 memset(addr, 0, sizeof(addr)); 1932 memcpy(addr, netdev->dev_addr, ETH_ALEN); 1933 1934 writel(le32_to_cpu(addr[0]), port->gmac_base + GMAC_STA_ADD0); 1935 writel(le32_to_cpu(addr[1]), port->gmac_base + GMAC_STA_ADD1); 1936 writel(le32_to_cpu(addr[2]), port->gmac_base + GMAC_STA_ADD2); 1937 } 1938 1939 static int gmac_set_mac_address(struct net_device *netdev, void *addr) 1940 { 1941 struct sockaddr *sa = addr; 1942 1943 eth_hw_addr_set(netdev, sa->sa_data); 1944 gmac_write_mac_address(netdev); 1945 1946 return 0; 1947 } 1948 1949 static void gmac_clear_hw_stats(struct net_device *netdev) 1950 { 1951 struct gemini_ethernet_port *port = netdev_priv(netdev); 1952 1953 readl(port->gmac_base + GMAC_IN_DISCARDS); 1954 readl(port->gmac_base + GMAC_IN_ERRORS); 1955 readl(port->gmac_base + GMAC_IN_MCAST); 1956 readl(port->gmac_base + GMAC_IN_BCAST); 1957 readl(port->gmac_base + GMAC_IN_MAC1); 1958 readl(port->gmac_base + GMAC_IN_MAC2); 1959 } 1960 1961 static void gmac_get_stats64(struct net_device *netdev, 1962 struct rtnl_link_stats64 *stats) 1963 { 1964 struct gemini_ethernet_port *port = netdev_priv(netdev); 1965 unsigned int start; 1966 1967 gmac_update_hw_stats(netdev); 1968 1969 /* Racing with RX NAPI */ 1970 do { 1971 start = u64_stats_fetch_begin(&port->rx_stats_syncp); 1972 1973 stats->rx_packets = port->stats.rx_packets; 1974 stats->rx_bytes = port->stats.rx_bytes; 1975 stats->rx_errors = port->stats.rx_errors; 1976 stats->rx_dropped = port->stats.rx_dropped; 1977 1978 stats->rx_length_errors = port->stats.rx_length_errors; 1979 stats->rx_over_errors = port->stats.rx_over_errors; 1980 stats->rx_crc_errors = port->stats.rx_crc_errors; 1981 stats->rx_frame_errors = port->stats.rx_frame_errors; 1982 1983 } while (u64_stats_fetch_retry(&port->rx_stats_syncp, start)); 1984 1985 /* Racing with MIB and TX completion interrupts */ 1986 do { 1987 start = u64_stats_fetch_begin(&port->ir_stats_syncp); 1988 1989 stats->tx_errors = port->stats.tx_errors; 1990 stats->tx_packets = port->stats.tx_packets; 1991 stats->tx_bytes = port->stats.tx_bytes; 1992 1993 stats->multicast = port->stats.multicast; 1994 stats->rx_missed_errors = port->stats.rx_missed_errors; 1995 stats->rx_fifo_errors = port->stats.rx_fifo_errors; 1996 1997 } while (u64_stats_fetch_retry(&port->ir_stats_syncp, start)); 1998 1999 /* Racing with hard_start_xmit */ 2000 do { 2001 start = u64_stats_fetch_begin(&port->tx_stats_syncp); 2002 2003 stats->tx_dropped = port->stats.tx_dropped; 2004 2005 } while (u64_stats_fetch_retry(&port->tx_stats_syncp, start)); 2006 2007 stats->rx_dropped += stats->rx_missed_errors; 2008 } 2009 2010 static int gmac_change_mtu(struct net_device *netdev, int new_mtu) 2011 { 2012 int max_len = gmac_pick_rx_max_len(new_mtu); 2013 2014 if (max_len < 0) 2015 return -EINVAL; 2016 2017 gmac_disable_tx_rx(netdev); 2018 2019 WRITE_ONCE(netdev->mtu, new_mtu); 2020 gmac_update_config0_reg(netdev, max_len << CONFIG0_MAXLEN_SHIFT, 2021 CONFIG0_MAXLEN_MASK); 2022 2023 netdev_update_features(netdev); 2024 2025 gmac_enable_tx_rx(netdev); 2026 2027 return 0; 2028 } 2029 2030 static int gmac_set_features(struct net_device *netdev, 2031 netdev_features_t features) 2032 { 2033 struct gemini_ethernet_port *port = netdev_priv(netdev); 2034 int enable = features & NETIF_F_RXCSUM; 2035 unsigned long flags; 2036 u32 reg; 2037 2038 spin_lock_irqsave(&port->config_lock, flags); 2039 2040 reg = readl(port->gmac_base + GMAC_CONFIG0); 2041 reg = enable ? reg | CONFIG0_RX_CHKSUM : reg & ~CONFIG0_RX_CHKSUM; 2042 writel(reg, port->gmac_base + GMAC_CONFIG0); 2043 2044 spin_unlock_irqrestore(&port->config_lock, flags); 2045 return 0; 2046 } 2047 2048 static int gmac_get_sset_count(struct net_device *netdev, int sset) 2049 { 2050 return sset == ETH_SS_STATS ? GMAC_STATS_NUM : 0; 2051 } 2052 2053 static void gmac_get_strings(struct net_device *netdev, u32 stringset, u8 *data) 2054 { 2055 if (stringset != ETH_SS_STATS) 2056 return; 2057 2058 memcpy(data, gmac_stats_strings, sizeof(gmac_stats_strings)); 2059 } 2060 2061 static void gmac_get_ethtool_stats(struct net_device *netdev, 2062 struct ethtool_stats *estats, u64 *values) 2063 { 2064 struct gemini_ethernet_port *port = netdev_priv(netdev); 2065 unsigned int start; 2066 u64 *p; 2067 int i; 2068 2069 gmac_update_hw_stats(netdev); 2070 2071 /* Racing with MIB interrupt */ 2072 do { 2073 p = values; 2074 start = u64_stats_fetch_begin(&port->ir_stats_syncp); 2075 2076 for (i = 0; i < RX_STATS_NUM; i++) 2077 *p++ = port->hw_stats[i]; 2078 2079 } while (u64_stats_fetch_retry(&port->ir_stats_syncp, start)); 2080 values = p; 2081 2082 /* Racing with RX NAPI */ 2083 do { 2084 p = values; 2085 start = u64_stats_fetch_begin(&port->rx_stats_syncp); 2086 2087 for (i = 0; i < RX_STATUS_NUM; i++) 2088 *p++ = port->rx_stats[i]; 2089 for (i = 0; i < RX_CHKSUM_NUM; i++) 2090 *p++ = port->rx_csum_stats[i]; 2091 *p++ = port->rx_napi_exits; 2092 2093 } while (u64_stats_fetch_retry(&port->rx_stats_syncp, start)); 2094 values = p; 2095 2096 /* Racing with TX start_xmit */ 2097 do { 2098 p = values; 2099 start = u64_stats_fetch_begin(&port->tx_stats_syncp); 2100 2101 for (i = 0; i < TX_MAX_FRAGS; i++) { 2102 *values++ = port->tx_frag_stats[i]; 2103 port->tx_frag_stats[i] = 0; 2104 } 2105 *values++ = port->tx_frags_linearized; 2106 *values++ = port->tx_hw_csummed; 2107 2108 } while (u64_stats_fetch_retry(&port->tx_stats_syncp, start)); 2109 } 2110 2111 static int gmac_get_ksettings(struct net_device *netdev, 2112 struct ethtool_link_ksettings *cmd) 2113 { 2114 if (!netdev->phydev) 2115 return -ENXIO; 2116 phy_ethtool_ksettings_get(netdev->phydev, cmd); 2117 2118 return 0; 2119 } 2120 2121 static int gmac_set_ksettings(struct net_device *netdev, 2122 const struct ethtool_link_ksettings *cmd) 2123 { 2124 if (!netdev->phydev) 2125 return -ENXIO; 2126 return phy_ethtool_ksettings_set(netdev->phydev, cmd); 2127 } 2128 2129 static int gmac_nway_reset(struct net_device *netdev) 2130 { 2131 if (!netdev->phydev) 2132 return -ENXIO; 2133 return phy_start_aneg(netdev->phydev); 2134 } 2135 2136 static void gmac_get_pauseparam(struct net_device *netdev, 2137 struct ethtool_pauseparam *pparam) 2138 { 2139 struct gemini_ethernet_port *port = netdev_priv(netdev); 2140 union gmac_config0 config0; 2141 2142 config0.bits32 = readl(port->gmac_base + GMAC_CONFIG0); 2143 2144 pparam->rx_pause = config0.bits.rx_fc_en; 2145 pparam->tx_pause = config0.bits.tx_fc_en; 2146 pparam->autoneg = true; 2147 } 2148 2149 static int gmac_set_pauseparam(struct net_device *netdev, 2150 struct ethtool_pauseparam *pparam) 2151 { 2152 struct phy_device *phydev = netdev->phydev; 2153 2154 if (!pparam->autoneg) 2155 return -EOPNOTSUPP; 2156 2157 phy_set_asym_pause(phydev, pparam->rx_pause, pparam->tx_pause); 2158 2159 return 0; 2160 } 2161 2162 static void gmac_get_ringparam(struct net_device *netdev, 2163 struct ethtool_ringparam *rp, 2164 struct kernel_ethtool_ringparam *kernel_rp, 2165 struct netlink_ext_ack *extack) 2166 { 2167 struct gemini_ethernet_port *port = netdev_priv(netdev); 2168 2169 readl(port->gmac_base + GMAC_CONFIG0); 2170 2171 rp->rx_max_pending = 1 << 15; 2172 rp->rx_mini_max_pending = 0; 2173 rp->rx_jumbo_max_pending = 0; 2174 rp->tx_max_pending = 1 << 15; 2175 2176 rp->rx_pending = 1 << port->rxq_order; 2177 rp->rx_mini_pending = 0; 2178 rp->rx_jumbo_pending = 0; 2179 rp->tx_pending = 1 << port->txq_order; 2180 } 2181 2182 static int gmac_set_ringparam(struct net_device *netdev, 2183 struct ethtool_ringparam *rp, 2184 struct kernel_ethtool_ringparam *kernel_rp, 2185 struct netlink_ext_ack *extack) 2186 { 2187 struct gemini_ethernet_port *port = netdev_priv(netdev); 2188 int err = 0; 2189 2190 if (netif_running(netdev)) 2191 return -EBUSY; 2192 2193 if (rp->rx_pending) { 2194 port->rxq_order = min(15, ilog2(rp->rx_pending - 1) + 1); 2195 err = geth_resize_freeq(port); 2196 } 2197 if (rp->tx_pending) { 2198 port->txq_order = min(15, ilog2(rp->tx_pending - 1) + 1); 2199 port->irq_every_tx_packets = 1 << (port->txq_order - 2); 2200 } 2201 2202 return err; 2203 } 2204 2205 static int gmac_get_coalesce(struct net_device *netdev, 2206 struct ethtool_coalesce *ecmd, 2207 struct kernel_ethtool_coalesce *kernel_coal, 2208 struct netlink_ext_ack *extack) 2209 { 2210 struct gemini_ethernet_port *port = netdev_priv(netdev); 2211 2212 ecmd->rx_max_coalesced_frames = 1; 2213 ecmd->tx_max_coalesced_frames = port->irq_every_tx_packets; 2214 ecmd->rx_coalesce_usecs = port->rx_coalesce_nsecs / 1000; 2215 2216 return 0; 2217 } 2218 2219 static int gmac_set_coalesce(struct net_device *netdev, 2220 struct ethtool_coalesce *ecmd, 2221 struct kernel_ethtool_coalesce *kernel_coal, 2222 struct netlink_ext_ack *extack) 2223 { 2224 struct gemini_ethernet_port *port = netdev_priv(netdev); 2225 2226 if (ecmd->tx_max_coalesced_frames < 1) 2227 return -EINVAL; 2228 if (ecmd->tx_max_coalesced_frames >= 1 << port->txq_order) 2229 return -EINVAL; 2230 2231 port->irq_every_tx_packets = ecmd->tx_max_coalesced_frames; 2232 port->rx_coalesce_nsecs = ecmd->rx_coalesce_usecs * 1000; 2233 2234 return 0; 2235 } 2236 2237 static u32 gmac_get_msglevel(struct net_device *netdev) 2238 { 2239 struct gemini_ethernet_port *port = netdev_priv(netdev); 2240 2241 return port->msg_enable; 2242 } 2243 2244 static void gmac_set_msglevel(struct net_device *netdev, u32 level) 2245 { 2246 struct gemini_ethernet_port *port = netdev_priv(netdev); 2247 2248 port->msg_enable = level; 2249 } 2250 2251 static void gmac_get_drvinfo(struct net_device *netdev, 2252 struct ethtool_drvinfo *info) 2253 { 2254 strcpy(info->driver, DRV_NAME); 2255 strcpy(info->bus_info, netdev->dev_id ? "1" : "0"); 2256 } 2257 2258 static const struct net_device_ops gmac_351x_ops = { 2259 .ndo_init = gmac_init, 2260 .ndo_open = gmac_open, 2261 .ndo_stop = gmac_stop, 2262 .ndo_start_xmit = gmac_start_xmit, 2263 .ndo_tx_timeout = gmac_tx_timeout, 2264 .ndo_set_rx_mode = gmac_set_rx_mode, 2265 .ndo_set_mac_address = gmac_set_mac_address, 2266 .ndo_get_stats64 = gmac_get_stats64, 2267 .ndo_change_mtu = gmac_change_mtu, 2268 .ndo_set_features = gmac_set_features, 2269 }; 2270 2271 static const struct ethtool_ops gmac_351x_ethtool_ops = { 2272 .supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS | 2273 ETHTOOL_COALESCE_MAX_FRAMES, 2274 .get_sset_count = gmac_get_sset_count, 2275 .get_strings = gmac_get_strings, 2276 .get_ethtool_stats = gmac_get_ethtool_stats, 2277 .get_link = ethtool_op_get_link, 2278 .get_link_ksettings = gmac_get_ksettings, 2279 .set_link_ksettings = gmac_set_ksettings, 2280 .nway_reset = gmac_nway_reset, 2281 .get_pauseparam = gmac_get_pauseparam, 2282 .set_pauseparam = gmac_set_pauseparam, 2283 .get_ringparam = gmac_get_ringparam, 2284 .set_ringparam = gmac_set_ringparam, 2285 .get_coalesce = gmac_get_coalesce, 2286 .set_coalesce = gmac_set_coalesce, 2287 .get_msglevel = gmac_get_msglevel, 2288 .set_msglevel = gmac_set_msglevel, 2289 .get_drvinfo = gmac_get_drvinfo, 2290 }; 2291 2292 static irqreturn_t gemini_port_irq_thread(int irq, void *data) 2293 { 2294 unsigned long irqmask = SWFQ_EMPTY_INT_BIT; 2295 struct gemini_ethernet_port *port = data; 2296 struct gemini_ethernet *geth; 2297 unsigned long flags; 2298 2299 geth = port->geth; 2300 /* The queue is half empty so refill it */ 2301 geth_fill_freeq(geth, true); 2302 2303 spin_lock_irqsave(&geth->irq_lock, flags); 2304 /* ACK queue interrupt */ 2305 writel(irqmask, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG); 2306 /* Enable queue interrupt again */ 2307 irqmask |= readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 2308 writel(irqmask, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 2309 spin_unlock_irqrestore(&geth->irq_lock, flags); 2310 2311 return IRQ_HANDLED; 2312 } 2313 2314 static irqreturn_t gemini_port_irq(int irq, void *data) 2315 { 2316 struct gemini_ethernet_port *port = data; 2317 struct gemini_ethernet *geth; 2318 irqreturn_t ret = IRQ_NONE; 2319 u32 val, en; 2320 2321 geth = port->geth; 2322 spin_lock(&geth->irq_lock); 2323 2324 val = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG); 2325 en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 2326 2327 if (val & en & SWFQ_EMPTY_INT_BIT) { 2328 /* Disable the queue empty interrupt while we work on 2329 * processing the queue. Also disable overrun interrupts 2330 * as there is not much we can do about it here. 2331 */ 2332 en &= ~(SWFQ_EMPTY_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT 2333 | GMAC1_RX_OVERRUN_INT_BIT); 2334 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 2335 ret = IRQ_WAKE_THREAD; 2336 } 2337 2338 spin_unlock(&geth->irq_lock); 2339 2340 return ret; 2341 } 2342 2343 static void gemini_port_remove(struct gemini_ethernet_port *port) 2344 { 2345 if (port->netdev) { 2346 phy_disconnect(port->netdev->phydev); 2347 unregister_netdev(port->netdev); 2348 } 2349 clk_disable_unprepare(port->pclk); 2350 geth_cleanup_freeq(port->geth); 2351 } 2352 2353 static void gemini_ethernet_init(struct gemini_ethernet *geth) 2354 { 2355 /* Only do this once both ports are online */ 2356 if (geth->initialized) 2357 return; 2358 if (geth->port0 && geth->port1) 2359 geth->initialized = true; 2360 else 2361 return; 2362 2363 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG); 2364 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG); 2365 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG); 2366 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG); 2367 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG); 2368 2369 /* Interrupt config: 2370 * 2371 * GMAC0 intr bits ------> int0 ----> eth0 2372 * GMAC1 intr bits ------> int1 ----> eth1 2373 * TOE intr -------------> int1 ----> eth1 2374 * Classification Intr --> int0 ----> eth0 2375 * Default Q0 -----------> int0 ----> eth0 2376 * Default Q1 -----------> int1 ----> eth1 2377 * FreeQ intr -----------> int1 ----> eth1 2378 */ 2379 writel(0xCCFC0FC0, geth->base + GLOBAL_INTERRUPT_SELECT_0_REG); 2380 writel(0x00F00002, geth->base + GLOBAL_INTERRUPT_SELECT_1_REG); 2381 writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_2_REG); 2382 writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_3_REG); 2383 writel(0xFF000003, geth->base + GLOBAL_INTERRUPT_SELECT_4_REG); 2384 2385 /* edge-triggered interrupts packed to level-triggered one... */ 2386 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG); 2387 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_1_REG); 2388 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_2_REG); 2389 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_3_REG); 2390 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG); 2391 2392 /* Set up queue */ 2393 writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG); 2394 writel(0, geth->base + GLOBAL_HW_FREEQ_BASE_SIZE_REG); 2395 writel(0, geth->base + GLOBAL_SWFQ_RWPTR_REG); 2396 writel(0, geth->base + GLOBAL_HWFQ_RWPTR_REG); 2397 2398 geth->freeq_frag_order = DEFAULT_RX_BUF_ORDER; 2399 /* This makes the queue resize on probe() so that we 2400 * set up and enable the queue IRQ. FIXME: fragile. 2401 */ 2402 geth->freeq_order = 1; 2403 } 2404 2405 static void gemini_port_save_mac_addr(struct gemini_ethernet_port *port) 2406 { 2407 port->mac_addr[0] = 2408 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD0)); 2409 port->mac_addr[1] = 2410 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD1)); 2411 port->mac_addr[2] = 2412 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD2)); 2413 } 2414 2415 static int gemini_ethernet_port_probe(struct platform_device *pdev) 2416 { 2417 char *port_names[2] = { "ethernet0", "ethernet1" }; 2418 struct device_node *np = pdev->dev.of_node; 2419 struct gemini_ethernet_port *port; 2420 struct device *dev = &pdev->dev; 2421 struct gemini_ethernet *geth; 2422 struct net_device *netdev; 2423 struct device *parent; 2424 u8 mac[ETH_ALEN]; 2425 unsigned int id; 2426 int irq; 2427 int ret; 2428 2429 parent = dev->parent; 2430 geth = dev_get_drvdata(parent); 2431 2432 if (!strcmp(dev_name(dev), "60008000.ethernet-port")) 2433 id = 0; 2434 else if (!strcmp(dev_name(dev), "6000c000.ethernet-port")) 2435 id = 1; 2436 else 2437 return -ENODEV; 2438 2439 dev_info(dev, "probe %s ID %d\n", dev_name(dev), id); 2440 2441 netdev = devm_alloc_etherdev_mqs(dev, sizeof(*port), TX_QUEUE_NUM, TX_QUEUE_NUM); 2442 if (!netdev) { 2443 dev_err(dev, "Can't allocate ethernet device #%d\n", id); 2444 return -ENOMEM; 2445 } 2446 2447 port = netdev_priv(netdev); 2448 SET_NETDEV_DEV(netdev, dev); 2449 port->netdev = netdev; 2450 port->id = id; 2451 port->geth = geth; 2452 port->dev = dev; 2453 port->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE); 2454 2455 /* DMA memory */ 2456 port->dma_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); 2457 if (IS_ERR(port->dma_base)) { 2458 dev_err(dev, "get DMA address failed\n"); 2459 return PTR_ERR(port->dma_base); 2460 } 2461 2462 /* GMAC config memory */ 2463 port->gmac_base = devm_platform_get_and_ioremap_resource(pdev, 1, NULL); 2464 if (IS_ERR(port->gmac_base)) { 2465 dev_err(dev, "get GMAC address failed\n"); 2466 return PTR_ERR(port->gmac_base); 2467 } 2468 2469 /* Interrupt */ 2470 irq = platform_get_irq(pdev, 0); 2471 if (irq < 0) 2472 return irq; 2473 port->irq = irq; 2474 2475 /* Clock the port */ 2476 port->pclk = devm_clk_get(dev, "PCLK"); 2477 if (IS_ERR(port->pclk)) { 2478 dev_err(dev, "no PCLK\n"); 2479 return PTR_ERR(port->pclk); 2480 } 2481 ret = clk_prepare_enable(port->pclk); 2482 if (ret) 2483 return ret; 2484 2485 /* Maybe there is a nice ethernet address we should use */ 2486 gemini_port_save_mac_addr(port); 2487 2488 /* Reset the port */ 2489 port->reset = devm_reset_control_get_exclusive(dev, NULL); 2490 if (IS_ERR(port->reset)) { 2491 dev_err(dev, "no reset\n"); 2492 ret = PTR_ERR(port->reset); 2493 goto unprepare; 2494 } 2495 reset_control_reset(port->reset); 2496 usleep_range(100, 500); 2497 2498 /* Assign pointer in the main state container */ 2499 if (!id) 2500 geth->port0 = port; 2501 else 2502 geth->port1 = port; 2503 2504 /* This will just be done once both ports are up and reset */ 2505 gemini_ethernet_init(geth); 2506 2507 platform_set_drvdata(pdev, port); 2508 2509 /* Set up and register the netdev */ 2510 netdev->dev_id = port->id; 2511 netdev->irq = irq; 2512 netdev->netdev_ops = &gmac_351x_ops; 2513 netdev->ethtool_ops = &gmac_351x_ethtool_ops; 2514 2515 spin_lock_init(&port->config_lock); 2516 gmac_clear_hw_stats(netdev); 2517 2518 netdev->hw_features = GMAC_OFFLOAD_FEATURES; 2519 netdev->features |= GMAC_OFFLOAD_FEATURES | NETIF_F_GRO; 2520 /* We can receive jumbo frames up to 10236 bytes but only 2521 * transmit 2047 bytes so, let's accept payloads of 2047 2522 * bytes minus VLAN and ethernet header 2523 */ 2524 netdev->min_mtu = ETH_MIN_MTU; 2525 netdev->max_mtu = MTU_SIZE_BIT_MASK - VLAN_ETH_HLEN; 2526 2527 port->freeq_refill = 0; 2528 netif_napi_add(netdev, &port->napi, gmac_napi_poll); 2529 2530 ret = of_get_mac_address(np, mac); 2531 if (!ret) { 2532 dev_info(dev, "Setting macaddr from DT %pM\n", mac); 2533 memcpy(port->mac_addr, mac, ETH_ALEN); 2534 } 2535 2536 if (is_valid_ether_addr((void *)port->mac_addr)) { 2537 eth_hw_addr_set(netdev, (u8 *)port->mac_addr); 2538 } else { 2539 dev_dbg(dev, "ethernet address 0x%08x%08x%08x invalid\n", 2540 port->mac_addr[0], port->mac_addr[1], 2541 port->mac_addr[2]); 2542 dev_info(dev, "using a random ethernet address\n"); 2543 eth_hw_addr_random(netdev); 2544 } 2545 gmac_write_mac_address(netdev); 2546 2547 ret = devm_request_threaded_irq(port->dev, 2548 port->irq, 2549 gemini_port_irq, 2550 gemini_port_irq_thread, 2551 IRQF_SHARED, 2552 port_names[port->id], 2553 port); 2554 if (ret) 2555 goto unprepare; 2556 2557 ret = gmac_setup_phy(netdev); 2558 if (ret) { 2559 netdev_err(netdev, 2560 "PHY init failed\n"); 2561 goto unprepare; 2562 } 2563 2564 ret = register_netdev(netdev); 2565 if (ret) 2566 goto unprepare; 2567 2568 return 0; 2569 2570 unprepare: 2571 clk_disable_unprepare(port->pclk); 2572 return ret; 2573 } 2574 2575 static void gemini_ethernet_port_remove(struct platform_device *pdev) 2576 { 2577 struct gemini_ethernet_port *port = platform_get_drvdata(pdev); 2578 2579 gemini_port_remove(port); 2580 } 2581 2582 static const struct of_device_id gemini_ethernet_port_of_match[] = { 2583 { 2584 .compatible = "cortina,gemini-ethernet-port", 2585 }, 2586 {}, 2587 }; 2588 MODULE_DEVICE_TABLE(of, gemini_ethernet_port_of_match); 2589 2590 static struct platform_driver gemini_ethernet_port_driver = { 2591 .driver = { 2592 .name = "gemini-ethernet-port", 2593 .of_match_table = gemini_ethernet_port_of_match, 2594 }, 2595 .probe = gemini_ethernet_port_probe, 2596 .remove = gemini_ethernet_port_remove, 2597 }; 2598 2599 static int gemini_ethernet_probe(struct platform_device *pdev) 2600 { 2601 struct device *dev = &pdev->dev; 2602 struct gemini_ethernet *geth; 2603 unsigned int retry = 5; 2604 u32 val; 2605 2606 /* Global registers */ 2607 geth = devm_kzalloc(dev, sizeof(*geth), GFP_KERNEL); 2608 if (!geth) 2609 return -ENOMEM; 2610 geth->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); 2611 if (IS_ERR(geth->base)) 2612 return PTR_ERR(geth->base); 2613 geth->dev = dev; 2614 2615 /* Wait for ports to stabilize */ 2616 do { 2617 udelay(2); 2618 val = readl(geth->base + GLOBAL_TOE_VERSION_REG); 2619 barrier(); 2620 } while (!val && --retry); 2621 if (!retry) { 2622 dev_err(dev, "failed to reset ethernet\n"); 2623 return -EIO; 2624 } 2625 dev_info(dev, "Ethernet device ID: 0x%03x, revision 0x%01x\n", 2626 (val >> 4) & 0xFFFU, val & 0xFU); 2627 2628 spin_lock_init(&geth->irq_lock); 2629 spin_lock_init(&geth->freeq_lock); 2630 2631 /* The children will use this */ 2632 platform_set_drvdata(pdev, geth); 2633 2634 /* Spawn child devices for the two ports */ 2635 return devm_of_platform_populate(dev); 2636 } 2637 2638 static void gemini_ethernet_remove(struct platform_device *pdev) 2639 { 2640 struct gemini_ethernet *geth = platform_get_drvdata(pdev); 2641 2642 geth_cleanup_freeq(geth); 2643 geth->initialized = false; 2644 } 2645 2646 static const struct of_device_id gemini_ethernet_of_match[] = { 2647 { 2648 .compatible = "cortina,gemini-ethernet", 2649 }, 2650 {}, 2651 }; 2652 MODULE_DEVICE_TABLE(of, gemini_ethernet_of_match); 2653 2654 static struct platform_driver gemini_ethernet_driver = { 2655 .driver = { 2656 .name = DRV_NAME, 2657 .of_match_table = gemini_ethernet_of_match, 2658 }, 2659 .probe = gemini_ethernet_probe, 2660 .remove = gemini_ethernet_remove, 2661 }; 2662 2663 static int __init gemini_ethernet_module_init(void) 2664 { 2665 int ret; 2666 2667 ret = platform_driver_register(&gemini_ethernet_port_driver); 2668 if (ret) 2669 return ret; 2670 2671 ret = platform_driver_register(&gemini_ethernet_driver); 2672 if (ret) { 2673 platform_driver_unregister(&gemini_ethernet_port_driver); 2674 return ret; 2675 } 2676 2677 return 0; 2678 } 2679 module_init(gemini_ethernet_module_init); 2680 2681 static void __exit gemini_ethernet_module_exit(void) 2682 { 2683 platform_driver_unregister(&gemini_ethernet_driver); 2684 platform_driver_unregister(&gemini_ethernet_port_driver); 2685 } 2686 module_exit(gemini_ethernet_module_exit); 2687 2688 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>"); 2689 MODULE_DESCRIPTION("StorLink SL351x (Gemini) ethernet driver"); 2690 MODULE_LICENSE("GPL"); 2691 MODULE_ALIAS("platform:" DRV_NAME); 2692