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smsc95xx.c

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linux-6.19.14/drivers/net/usb/smsc95xx.c C 
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2 /***************************************************************************
   3 *
   4 * Copyright (C) 2007-2008 SMSC
   5 *
   6 *****************************************************************************/
   7
   8#include <linux/module.h>
   9#include <linux/kmod.h>
  10#include <linux/netdevice.h>
  11#include <linux/etherdevice.h>
  12#include <linux/ethtool.h>
  13#include <linux/mii.h>
  14#include <linux/usb.h>
  15#include <linux/bitrev.h>
  16#include <linux/crc16.h>
  17#include <linux/crc32.h>
  18#include <linux/usb/usbnet.h>
  19#include <linux/slab.h>
  20#include <linux/of_net.h>
  21#include <linux/irq.h>
  22#include <linux/irqdomain.h>
  23#include <linux/mdio.h>
  24#include <linux/phy.h>
  25#include <net/selftests.h>
  26
  27#include "smsc95xx.h"
  28
  29#define SMSC_CHIPNAME			"smsc95xx"
  30#define SMSC_DRIVER_VERSION		"2.0.0"
  31#define HS_USB_PKT_SIZE			(512)
  32#define FS_USB_PKT_SIZE			(64)
  33#define DEFAULT_HS_BURST_CAP_SIZE	(16 * 1024 + 5 * HS_USB_PKT_SIZE)
  34#define DEFAULT_FS_BURST_CAP_SIZE	(6 * 1024 + 33 * FS_USB_PKT_SIZE)
  35#define DEFAULT_BULK_IN_DELAY		(0x00002000)
  36#define MAX_SINGLE_PACKET_SIZE		(2048)
  37#define LAN95XX_EEPROM_MAGIC		(0x9500)
  38#define EEPROM_MAC_OFFSET		(0x01)
  39#define DEFAULT_TX_CSUM_ENABLE		(true)
  40#define DEFAULT_RX_CSUM_ENABLE		(true)
  41#define SMSC95XX_INTERNAL_PHY_ID	(1)
  42#define SMSC95XX_TX_OVERHEAD		(8)
  43#define SMSC95XX_TX_OVERHEAD_CSUM	(12)
  44#define SUPPORTED_WAKE			(WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
  45					 WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
  46
  47#define FEATURE_8_WAKEUP_FILTERS	(0x01)
  48#define FEATURE_PHY_NLP_CROSSOVER	(0x02)
  49#define FEATURE_REMOTE_WAKEUP		(0x04)
  50
  51#define SUSPEND_SUSPEND0		(0x01)
  52#define SUSPEND_SUSPEND1		(0x02)
  53#define SUSPEND_SUSPEND2		(0x04)
  54#define SUSPEND_SUSPEND3		(0x08)
  55#define SUSPEND_ALLMODES		(SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
  56					 SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
  57
  58#define SMSC95XX_NR_IRQS		(1) /* raise to 12 for GPIOs */
  59#define PHY_HWIRQ			(SMSC95XX_NR_IRQS - 1)
  60
  61struct smsc95xx_priv {
  62	u32 mac_cr;
  63	u32 hash_hi;
  64	u32 hash_lo;
  65	u32 wolopts;
  66	bool pause_rx;
  67	bool pause_tx;
  68	bool pause_autoneg;
  69	spinlock_t mac_cr_lock;
  70	u8 features;
  71	u8 suspend_flags;
  72	bool is_internal_phy;
  73	struct irq_chip irqchip;
  74	struct irq_domain *irqdomain;
  75	struct fwnode_handle *irqfwnode;
  76	struct mii_bus *mdiobus;
  77	struct phy_device *phydev;
  78	struct task_struct *pm_task;
  79};
  80
  81static bool turbo_mode = true;
  82module_param(turbo_mode, bool, 0644);
  83MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  84
  85static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
  86					  u32 *data)
  87{
  88	struct smsc95xx_priv *pdata = dev->driver_priv;
  89	u32 buf;
  90	int ret;
  91	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  92
  93	if (current != pdata->pm_task)
  94		fn = usbnet_read_cmd;
  95	else
  96		fn = usbnet_read_cmd_nopm;
  97
  98	ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  99		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 100		 0, index, &buf, 4);
 101	if (ret < 4) {
 102		ret = ret < 0 ? ret : -ENODATA;
 103
 104		if (ret != -ENODEV)
 105			netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
 106				    index, ret);
 107		return ret;
 108	}
 109
 110	le32_to_cpus(&buf);
 111	*data = buf;
 112
 113	return ret;
 114}
 115
 116static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 117					   u32 data)
 118{
 119	struct smsc95xx_priv *pdata = dev->driver_priv;
 120	u32 buf;
 121	int ret;
 122	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 123
 124	if (current != pdata->pm_task)
 125		fn = usbnet_write_cmd;
 126	else
 127		fn = usbnet_write_cmd_nopm;
 128
 129	buf = data;
 130	cpu_to_le32s(&buf);
 131
 132	ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 133		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 134		 0, index, &buf, 4);
 135	if (ret < 0 && ret != -ENODEV)
 136		netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 137			    index, ret);
 138
 139	return ret;
 140}
 141
 142/* Loop until the read is completed with timeout
 143 * called with phy_mutex held */
 144static int __must_check smsc95xx_phy_wait_not_busy(struct usbnet *dev)
 145{
 146	unsigned long start_time = jiffies;
 147	u32 val;
 148	int ret;
 149
 150	do {
 151		ret = smsc95xx_read_reg(dev, MII_ADDR, &val);
 152		if (ret < 0) {
 153			/* Ignore -ENODEV error during disconnect() */
 154			if (ret == -ENODEV)
 155				return 0;
 156			netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 157			return ret;
 158		}
 159
 160		if (!(val & MII_BUSY_))
 161			return 0;
 162	} while (!time_after(jiffies, start_time + HZ));
 163
 164	return -EIO;
 165}
 166
 167static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 168{
 169	return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 170}
 171
 172static int smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx)
 173{
 174	u32 val, addr;
 175	int ret;
 176
 177	mutex_lock(&dev->phy_mutex);
 178
 179	/* confirm MII not busy */
 180	ret = smsc95xx_phy_wait_not_busy(dev);
 181	if (ret < 0) {
 182		netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 183		goto done;
 184	}
 185
 186	/* set the address, index & direction (read from PHY) */
 187	addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 188	ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
 189	if (ret < 0) {
 190		if (ret != -ENODEV)
 191			netdev_warn(dev->net, "Error writing MII_ADDR\n");
 192		goto done;
 193	}
 194
 195	ret = smsc95xx_phy_wait_not_busy(dev);
 196	if (ret < 0) {
 197		netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 198		goto done;
 199	}
 200
 201	ret = smsc95xx_read_reg(dev, MII_DATA, &val);
 202	if (ret < 0) {
 203		if (ret != -ENODEV)
 204			netdev_warn(dev->net, "Error reading MII_DATA\n");
 205		goto done;
 206	}
 207
 208	ret = (u16)(val & 0xFFFF);
 209
 210done:
 211	mutex_unlock(&dev->phy_mutex);
 212
 213	/* Ignore -ENODEV error during disconnect() */
 214	if (ret == -ENODEV)
 215		return 0;
 216	return ret;
 217}
 218
 219static void smsc95xx_mdio_write(struct usbnet *dev, int phy_id, int idx,
 220				int regval)
 221{
 222	u32 val, addr;
 223	int ret;
 224
 225	mutex_lock(&dev->phy_mutex);
 226
 227	/* confirm MII not busy */
 228	ret = smsc95xx_phy_wait_not_busy(dev);
 229	if (ret < 0) {
 230		netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 231		goto done;
 232	}
 233
 234	val = regval;
 235	ret = smsc95xx_write_reg(dev, MII_DATA, val);
 236	if (ret < 0) {
 237		if (ret != -ENODEV)
 238			netdev_warn(dev->net, "Error writing MII_DATA\n");
 239		goto done;
 240	}
 241
 242	/* set the address, index & direction (write to PHY) */
 243	addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 244	ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
 245	if (ret < 0) {
 246		if (ret != -ENODEV)
 247			netdev_warn(dev->net, "Error writing MII_ADDR\n");
 248		goto done;
 249	}
 250
 251	ret = smsc95xx_phy_wait_not_busy(dev);
 252	if (ret < 0) {
 253		netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 254		goto done;
 255	}
 256
 257done:
 258	mutex_unlock(&dev->phy_mutex);
 259}
 260
 261static int smsc95xx_mdiobus_reset(struct mii_bus *bus)
 262{
 263	struct smsc95xx_priv *pdata;
 264	struct usbnet *dev;
 265	u32 val;
 266	int ret;
 267
 268	dev = bus->priv;
 269	pdata = dev->driver_priv;
 270
 271	if (pdata->is_internal_phy)
 272		return 0;
 273
 274	mutex_lock(&dev->phy_mutex);
 275
 276	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
 277	if (ret < 0)
 278		goto reset_out;
 279
 280	val |= PM_CTL_PHY_RST_;
 281
 282	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
 283	if (ret < 0)
 284		goto reset_out;
 285
 286	/* Driver has no knowledge at this point about the external PHY.
 287	 * The 802.3 specifies that the reset process shall
 288	 * be completed within 0.5 s.
 289	 */
 290	fsleep(500000);
 291
 292reset_out:
 293	mutex_unlock(&dev->phy_mutex);
 294
 295	return 0;
 296}
 297
 298static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 299{
 300	struct usbnet *dev = bus->priv;
 301
 302	return smsc95xx_mdio_read(dev, phy_id, idx);
 303}
 304
 305static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 306				  u16 regval)
 307{
 308	struct usbnet *dev = bus->priv;
 309
 310	smsc95xx_mdio_write(dev, phy_id, idx, regval);
 311	return 0;
 312}
 313
 314static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 315{
 316	unsigned long start_time = jiffies;
 317	u32 val;
 318	int ret;
 319
 320	do {
 321		ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 322		if (ret < 0) {
 323			netdev_warn(dev->net, "Error reading E2P_CMD\n");
 324			return ret;
 325		}
 326
 327		if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 328			break;
 329		udelay(40);
 330	} while (!time_after(jiffies, start_time + HZ));
 331
 332	if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 333		netdev_warn(dev->net, "EEPROM read operation timeout\n");
 334		return -EIO;
 335	}
 336
 337	return 0;
 338}
 339
 340static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 341{
 342	unsigned long start_time = jiffies;
 343	u32 val;
 344	int ret;
 345
 346	do {
 347		ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 348		if (ret < 0) {
 349			netdev_warn(dev->net, "Error reading E2P_CMD\n");
 350			return ret;
 351		}
 352
 353		if (!(val & E2P_CMD_BUSY_))
 354			return 0;
 355
 356		udelay(40);
 357	} while (!time_after(jiffies, start_time + HZ));
 358
 359	netdev_warn(dev->net, "EEPROM is busy\n");
 360	return -EIO;
 361}
 362
 363static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 364				u8 *data)
 365{
 366	u32 val;
 367	int i, ret;
 368
 369	BUG_ON(!dev);
 370	BUG_ON(!data);
 371
 372	ret = smsc95xx_eeprom_confirm_not_busy(dev);
 373	if (ret)
 374		return ret;
 375
 376	for (i = 0; i < length; i++) {
 377		val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 378		ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 379		if (ret < 0) {
 380			netdev_warn(dev->net, "Error writing E2P_CMD\n");
 381			return ret;
 382		}
 383
 384		ret = smsc95xx_wait_eeprom(dev);
 385		if (ret < 0)
 386			return ret;
 387
 388		ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 389		if (ret < 0) {
 390			netdev_warn(dev->net, "Error reading E2P_DATA\n");
 391			return ret;
 392		}
 393
 394		data[i] = val & 0xFF;
 395		offset++;
 396	}
 397
 398	return 0;
 399}
 400
 401static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 402				 u8 *data)
 403{
 404	u32 val;
 405	int i, ret;
 406
 407	BUG_ON(!dev);
 408	BUG_ON(!data);
 409
 410	ret = smsc95xx_eeprom_confirm_not_busy(dev);
 411	if (ret)
 412		return ret;
 413
 414	/* Issue write/erase enable command */
 415	val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 416	ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 417	if (ret < 0) {
 418		netdev_warn(dev->net, "Error writing E2P_DATA\n");
 419		return ret;
 420	}
 421
 422	ret = smsc95xx_wait_eeprom(dev);
 423	if (ret < 0)
 424		return ret;
 425
 426	for (i = 0; i < length; i++) {
 427
 428		/* Fill data register */
 429		val = data[i];
 430		ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 431		if (ret < 0) {
 432			netdev_warn(dev->net, "Error writing E2P_DATA\n");
 433			return ret;
 434		}
 435
 436		/* Send "write" command */
 437		val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 438		ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 439		if (ret < 0) {
 440			netdev_warn(dev->net, "Error writing E2P_CMD\n");
 441			return ret;
 442		}
 443
 444		ret = smsc95xx_wait_eeprom(dev);
 445		if (ret < 0)
 446			return ret;
 447
 448		offset++;
 449	}
 450
 451	return 0;
 452}
 453
 454static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 455						 u32 data)
 456{
 457	const u16 size = 4;
 458	u32 buf;
 459	int ret;
 460
 461	buf = data;
 462	cpu_to_le32s(&buf);
 463
 464	ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 465				     USB_DIR_OUT | USB_TYPE_VENDOR |
 466				     USB_RECIP_DEVICE,
 467				     0, index, &buf, size);
 468	if (ret < 0)
 469		netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 470			    ret);
 471	return ret;
 472}
 473
 474/* returns hash bit number for given MAC address
 475 * example:
 476 * 01 00 5E 00 00 01 -> returns bit number 31 */
 477static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 478{
 479	return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 480}
 481
 482static void smsc95xx_set_multicast(struct net_device *netdev)
 483{
 484	struct usbnet *dev = netdev_priv(netdev);
 485	struct smsc95xx_priv *pdata = dev->driver_priv;
 486	unsigned long flags;
 487	int ret;
 488
 489	pdata->hash_hi = 0;
 490	pdata->hash_lo = 0;
 491
 492	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 493
 494	if (dev->net->flags & IFF_PROMISC) {
 495		netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 496		pdata->mac_cr |= MAC_CR_PRMS_;
 497		pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 498	} else if (dev->net->flags & IFF_ALLMULTI) {
 499		netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 500		pdata->mac_cr |= MAC_CR_MCPAS_;
 501		pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 502	} else if (!netdev_mc_empty(dev->net)) {
 503		struct netdev_hw_addr *ha;
 504
 505		pdata->mac_cr |= MAC_CR_HPFILT_;
 506		pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 507
 508		netdev_for_each_mc_addr(ha, netdev) {
 509			u32 bitnum = smsc95xx_hash(ha->addr);
 510			u32 mask = 0x01 << (bitnum & 0x1F);
 511			if (bitnum & 0x20)
 512				pdata->hash_hi |= mask;
 513			else
 514				pdata->hash_lo |= mask;
 515		}
 516
 517		netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 518				   pdata->hash_hi, pdata->hash_lo);
 519	} else {
 520		netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 521		pdata->mac_cr &=
 522			~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 523	}
 524
 525	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 526
 527	/* Initiate async writes, as we can't wait for completion here */
 528	ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 529	if (ret < 0)
 530		netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 531
 532	ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 533	if (ret < 0)
 534		netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 535
 536	ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 537	if (ret < 0)
 538		netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 539}
 540
 541static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
 542{
 543	struct smsc95xx_priv *pdata = dev->driver_priv;
 544	u32 flow = 0, afc_cfg;
 545
 546	int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 547	if (ret < 0)
 548		return ret;
 549
 550	if (pdata->phydev->duplex == DUPLEX_FULL) {
 551		bool tx_pause, rx_pause;
 552
 553		if (pdata->phydev->autoneg == AUTONEG_ENABLE &&
 554		    pdata->pause_autoneg) {
 555			phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 556		} else {
 557			tx_pause = pdata->pause_tx;
 558			rx_pause = pdata->pause_rx;
 559		}
 560
 561		if (rx_pause)
 562			flow = 0xFFFF0002;
 563
 564		if (tx_pause) {
 565			afc_cfg |= 0xF;
 566			flow |= 0xFFFF0000;
 567		} else {
 568			afc_cfg &= ~0xF;
 569		}
 570
 571		netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 572			  rx_pause ? "enabled" : "disabled",
 573			  tx_pause ? "enabled" : "disabled");
 574	} else {
 575		netif_dbg(dev, link, dev->net, "half duplex\n");
 576		afc_cfg |= 0xF;
 577	}
 578
 579	ret = smsc95xx_write_reg(dev, FLOW, flow);
 580	if (ret < 0)
 581		return ret;
 582
 583	return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 584}
 585
 586static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
 587{
 588	struct smsc95xx_priv *pdata = dev->driver_priv;
 589	unsigned long flags;
 590	int ret;
 591
 592	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 593	if (pdata->phydev->duplex != DUPLEX_FULL) {
 594		pdata->mac_cr &= ~MAC_CR_FDPX_;
 595		pdata->mac_cr |= MAC_CR_RCVOWN_;
 596	} else {
 597		pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 598		pdata->mac_cr |= MAC_CR_FDPX_;
 599	}
 600	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 601
 602	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 603	if (ret < 0) {
 604		if (ret != -ENODEV)
 605			netdev_warn(dev->net,
 606				    "Error updating MAC full duplex mode\n");
 607		return;
 608	}
 609
 610	ret = smsc95xx_phy_update_flowcontrol(dev);
 611	if (ret < 0)
 612		netdev_warn(dev->net, "Error updating PHY flow control\n");
 613}
 614
 615static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 616{
 617	struct smsc95xx_priv *pdata = dev->driver_priv;
 618	unsigned long flags;
 619	u32 intdata;
 620
 621	if (urb->actual_length != 4) {
 622		netdev_warn(dev->net, "unexpected urb length %d\n",
 623			    urb->actual_length);
 624		return;
 625	}
 626
 627	intdata = get_unaligned_le32(urb->transfer_buffer);
 628	netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 629
 630	local_irq_save(flags);
 631
 632	if (intdata & INT_ENP_PHY_INT_)
 633		generic_handle_domain_irq(pdata->irqdomain, PHY_HWIRQ);
 634	else
 635		netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 636			    intdata);
 637
 638	local_irq_restore(flags);
 639}
 640
 641/* Enable or disable Tx & Rx checksum offload engines */
 642static int smsc95xx_set_features(struct net_device *netdev,
 643	netdev_features_t features)
 644{
 645	struct usbnet *dev = netdev_priv(netdev);
 646	u32 read_buf;
 647	int ret;
 648
 649	ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 650	if (ret < 0)
 651		return ret;
 652
 653	if (features & NETIF_F_IP_CSUM)
 654		read_buf |= Tx_COE_EN_;
 655	else
 656		read_buf &= ~Tx_COE_EN_;
 657
 658	if (features & NETIF_F_RXCSUM)
 659		read_buf |= Rx_COE_EN_;
 660	else
 661		read_buf &= ~Rx_COE_EN_;
 662
 663	ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 664	if (ret < 0)
 665		return ret;
 666
 667	netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 668	return 0;
 669}
 670
 671static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 672{
 673	return MAX_EEPROM_SIZE;
 674}
 675
 676static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 677				       struct ethtool_eeprom *ee, u8 *data)
 678{
 679	struct usbnet *dev = netdev_priv(netdev);
 680
 681	ee->magic = LAN95XX_EEPROM_MAGIC;
 682
 683	return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 684}
 685
 686static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 687				       struct ethtool_eeprom *ee, u8 *data)
 688{
 689	struct usbnet *dev = netdev_priv(netdev);
 690
 691	if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 692		netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 693			    ee->magic);
 694		return -EINVAL;
 695	}
 696
 697	return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 698}
 699
 700static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 701{
 702	/* all smsc95xx registers */
 703	return COE_CR - ID_REV + sizeof(u32);
 704}
 705
 706static void
 707smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 708			 void *buf)
 709{
 710	struct usbnet *dev = netdev_priv(netdev);
 711	unsigned int i, j;
 712	int retval;
 713	u32 *data = buf;
 714
 715	retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 716	if (retval < 0) {
 717		netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 718		return;
 719	}
 720
 721	for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 722		retval = smsc95xx_read_reg(dev, i, &data[j]);
 723		if (retval < 0) {
 724			netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 725			return;
 726		}
 727	}
 728}
 729
 730static void smsc95xx_ethtool_get_wol(struct net_device *net,
 731				     struct ethtool_wolinfo *wolinfo)
 732{
 733	struct usbnet *dev = netdev_priv(net);
 734	struct smsc95xx_priv *pdata = dev->driver_priv;
 735
 736	wolinfo->supported = SUPPORTED_WAKE;
 737	wolinfo->wolopts = pdata->wolopts;
 738}
 739
 740static int smsc95xx_ethtool_set_wol(struct net_device *net,
 741				    struct ethtool_wolinfo *wolinfo)
 742{
 743	struct usbnet *dev = netdev_priv(net);
 744	struct smsc95xx_priv *pdata = dev->driver_priv;
 745	int ret;
 746
 747	if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 748		return -EINVAL;
 749
 750	pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 751
 752	ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 753	if (ret < 0)
 754		netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 755
 756	return ret;
 757}
 758
 759static u32 smsc95xx_get_link(struct net_device *net)
 760{
 761	phy_read_status(net->phydev);
 762	return net->phydev->link;
 763}
 764
 765static void smsc95xx_ethtool_get_strings(struct net_device *netdev, u32 sset,
 766					u8 *data)
 767{
 768	switch (sset) {
 769	case ETH_SS_TEST:
 770		net_selftest_get_strings(data);
 771		break;
 772	}
 773}
 774
 775static int smsc95xx_ethtool_get_sset_count(struct net_device *ndev, int sset)
 776{
 777	switch (sset) {
 778	case ETH_SS_TEST:
 779		return net_selftest_get_count();
 780	default:
 781		return -EOPNOTSUPP;
 782	}
 783}
 784
 785static void smsc95xx_get_pauseparam(struct net_device *ndev,
 786				    struct ethtool_pauseparam *pause)
 787{
 788	struct smsc95xx_priv *pdata;
 789	struct usbnet *dev;
 790
 791	dev = netdev_priv(ndev);
 792	pdata = dev->driver_priv;
 793
 794	pause->autoneg = pdata->pause_autoneg;
 795	pause->rx_pause = pdata->pause_rx;
 796	pause->tx_pause = pdata->pause_tx;
 797}
 798
 799static int smsc95xx_set_pauseparam(struct net_device *ndev,
 800				   struct ethtool_pauseparam *pause)
 801{
 802	bool pause_autoneg_rx, pause_autoneg_tx;
 803	struct smsc95xx_priv *pdata;
 804	struct phy_device *phydev;
 805	struct usbnet *dev;
 806
 807	dev = netdev_priv(ndev);
 808	pdata = dev->driver_priv;
 809	phydev = ndev->phydev;
 810
 811	if (!phydev)
 812		return -ENODEV;
 813
 814	pdata->pause_rx = pause->rx_pause;
 815	pdata->pause_tx = pause->tx_pause;
 816	pdata->pause_autoneg = pause->autoneg;
 817
 818	if (pause->autoneg) {
 819		pause_autoneg_rx = pause->rx_pause;
 820		pause_autoneg_tx = pause->tx_pause;
 821	} else {
 822		pause_autoneg_rx = false;
 823		pause_autoneg_tx = false;
 824	}
 825
 826	phy_set_asym_pause(ndev->phydev, pause_autoneg_rx, pause_autoneg_tx);
 827	if (phydev->link && (!pause->autoneg ||
 828			     phydev->autoneg == AUTONEG_DISABLE))
 829		smsc95xx_mac_update_fullduplex(dev);
 830
 831	return 0;
 832}
 833
 834static const struct ethtool_ops smsc95xx_ethtool_ops = {
 835	.get_link	= smsc95xx_get_link,
 836	.nway_reset	= phy_ethtool_nway_reset,
 837	.get_drvinfo	= usbnet_get_drvinfo,
 838	.get_msglevel	= usbnet_get_msglevel,
 839	.set_msglevel	= usbnet_set_msglevel,
 840	.get_eeprom_len	= smsc95xx_ethtool_get_eeprom_len,
 841	.get_eeprom	= smsc95xx_ethtool_get_eeprom,
 842	.set_eeprom	= smsc95xx_ethtool_set_eeprom,
 843	.get_regs_len	= smsc95xx_ethtool_getregslen,
 844	.get_regs	= smsc95xx_ethtool_getregs,
 845	.get_wol	= smsc95xx_ethtool_get_wol,
 846	.set_wol	= smsc95xx_ethtool_set_wol,
 847	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
 848	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
 849	.get_ts_info	= ethtool_op_get_ts_info,
 850	.self_test	= net_selftest,
 851	.get_strings	= smsc95xx_ethtool_get_strings,
 852	.get_sset_count	= smsc95xx_ethtool_get_sset_count,
 853	.get_pauseparam	= smsc95xx_get_pauseparam,
 854	.set_pauseparam	= smsc95xx_set_pauseparam,
 855};
 856
 857static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 858{
 859	if (!netif_running(netdev))
 860		return -EINVAL;
 861
 862	return phy_mii_ioctl(netdev->phydev, rq, cmd);
 863}
 864
 865static void smsc95xx_init_mac_address(struct usbnet *dev)
 866{
 867	u8 addr[ETH_ALEN];
 868
 869	/* maybe the boot loader passed the MAC address in devicetree */
 870	if (!platform_get_ethdev_address(&dev->udev->dev, dev->net)) {
 871		if (is_valid_ether_addr(dev->net->dev_addr)) {
 872			/* device tree values are valid so use them */
 873			netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 874			return;
 875		}
 876	}
 877
 878	/* try reading mac address from EEPROM */
 879	if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN, addr) == 0) {
 880		eth_hw_addr_set(dev->net, addr);
 881		if (is_valid_ether_addr(dev->net->dev_addr)) {
 882			/* eeprom values are valid so use them */
 883			netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 884			return;
 885		}
 886	}
 887
 888	/* no useful static MAC address found. generate a random one */
 889	eth_hw_addr_random(dev->net);
 890	netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 891}
 892
 893static int smsc95xx_set_mac_address(struct usbnet *dev)
 894{
 895	u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 896		dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 897	u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 898	int ret;
 899
 900	ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 901	if (ret < 0)
 902		return ret;
 903
 904	return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 905}
 906
 907/* starts the TX path */
 908static int smsc95xx_start_tx_path(struct usbnet *dev)
 909{
 910	struct smsc95xx_priv *pdata = dev->driver_priv;
 911	unsigned long flags;
 912	int ret;
 913
 914	/* Enable Tx at MAC */
 915	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 916	pdata->mac_cr |= MAC_CR_TXEN_;
 917	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 918
 919	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 920	if (ret < 0)
 921		return ret;
 922
 923	/* Enable Tx at SCSRs */
 924	return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 925}
 926
 927/* Starts the Receive path */
 928static int smsc95xx_start_rx_path(struct usbnet *dev)
 929{
 930	struct smsc95xx_priv *pdata = dev->driver_priv;
 931	unsigned long flags;
 932
 933	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 934	pdata->mac_cr |= MAC_CR_RXEN_;
 935	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 936
 937	return smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 938}
 939
 940static int smsc95xx_reset(struct usbnet *dev)
 941{
 942	struct smsc95xx_priv *pdata = dev->driver_priv;
 943	u32 read_buf, burst_cap;
 944	int ret = 0, timeout;
 945
 946	netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 947
 948	ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 949	if (ret < 0)
 950		return ret;
 951
 952	timeout = 0;
 953	do {
 954		msleep(10);
 955		ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 956		if (ret < 0)
 957			return ret;
 958		timeout++;
 959	} while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 960
 961	if (timeout >= 100) {
 962		netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 963		return -ETIMEDOUT;
 964	}
 965
 966	ret = smsc95xx_set_mac_address(dev);
 967	if (ret < 0)
 968		return ret;
 969
 970	netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 971		  dev->net->dev_addr);
 972
 973	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 974	if (ret < 0)
 975		return ret;
 976
 977	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 978		  read_buf);
 979
 980	read_buf |= HW_CFG_BIR_;
 981
 982	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 983	if (ret < 0)
 984		return ret;
 985
 986	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 987	if (ret < 0)
 988		return ret;
 989
 990	netif_dbg(dev, ifup, dev->net,
 991		  "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 992		  read_buf);
 993
 994	if (!turbo_mode) {
 995		burst_cap = 0;
 996		dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 997	} else if (dev->udev->speed == USB_SPEED_HIGH) {
 998		burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 999		dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
1000	} else {
1001		burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
1002		dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
1003	}
1004
1005	netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
1006		  (ulong)dev->rx_urb_size);
1007
1008	ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
1009	if (ret < 0)
1010		return ret;
1011
1012	ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
1013	if (ret < 0)
1014		return ret;
1015
1016	netif_dbg(dev, ifup, dev->net,
1017		  "Read Value from BURST_CAP after writing: 0x%08x\n",
1018		  read_buf);
1019
1020	ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
1021	if (ret < 0)
1022		return ret;
1023
1024	ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
1025	if (ret < 0)
1026		return ret;
1027
1028	netif_dbg(dev, ifup, dev->net,
1029		  "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
1030		  read_buf);
1031
1032	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1033	if (ret < 0)
1034		return ret;
1035
1036	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
1037		  read_buf);
1038
1039	if (turbo_mode)
1040		read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
1041
1042	read_buf &= ~HW_CFG_RXDOFF_;
1043
1044	/* set Rx data offset=2, Make IP header aligns on word boundary. */
1045	read_buf |= NET_IP_ALIGN << 9;
1046
1047	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
1048	if (ret < 0)
1049		return ret;
1050
1051	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1052	if (ret < 0)
1053		return ret;
1054
1055	netif_dbg(dev, ifup, dev->net,
1056		  "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
1057
1058	ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
1059	if (ret < 0)
1060		return ret;
1061
1062	ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1063	if (ret < 0)
1064		return ret;
1065	netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1066
1067	ret = smsc95xx_read_reg(dev, LED_GPIO_CFG, &read_buf);
1068	if (ret < 0)
1069		return ret;
1070	/* Configure GPIO pins as LED outputs */
1071	read_buf |= LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1072		    LED_GPIO_CFG_FDX_LED;
1073	ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, read_buf);
1074	if (ret < 0)
1075		return ret;
1076
1077	/* Init Tx */
1078	ret = smsc95xx_write_reg(dev, FLOW, 0);
1079	if (ret < 0)
1080		return ret;
1081
1082	ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1083	if (ret < 0)
1084		return ret;
1085
1086	/* Don't need mac_cr_lock during initialisation */
1087	ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1088	if (ret < 0)
1089		return ret;
1090
1091	/* Init Rx */
1092	/* Set Vlan */
1093	ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1094	if (ret < 0)
1095		return ret;
1096
1097	/* Enable or disable checksum offload engines */
1098	ret = smsc95xx_set_features(dev->net, dev->net->features);
1099	if (ret < 0) {
1100		netdev_warn(dev->net, "Failed to set checksum offload features\n");
1101		return ret;
1102	}
1103
1104	smsc95xx_set_multicast(dev->net);
1105
1106	ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1107	if (ret < 0)
1108		return ret;
1109
1110	/* enable PHY interrupts */
1111	read_buf |= INT_EP_CTL_PHY_INT_;
1112
1113	ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1114	if (ret < 0)
1115		return ret;
1116
1117	ret = smsc95xx_start_tx_path(dev);
1118	if (ret < 0) {
1119		netdev_warn(dev->net, "Failed to start TX path\n");
1120		return ret;
1121	}
1122
1123	ret = smsc95xx_start_rx_path(dev);
1124	if (ret < 0) {
1125		netdev_warn(dev->net, "Failed to start RX path\n");
1126		return ret;
1127	}
1128
1129	netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1130	return 0;
1131}
1132
1133static const struct net_device_ops smsc95xx_netdev_ops = {
1134	.ndo_open		= usbnet_open,
1135	.ndo_stop		= usbnet_stop,
1136	.ndo_start_xmit		= usbnet_start_xmit,
1137	.ndo_tx_timeout		= usbnet_tx_timeout,
1138	.ndo_change_mtu		= usbnet_change_mtu,
1139	.ndo_get_stats64	= dev_get_tstats64,
1140	.ndo_set_mac_address 	= eth_mac_addr,
1141	.ndo_validate_addr	= eth_validate_addr,
1142	.ndo_eth_ioctl		= smsc95xx_ioctl,
1143	.ndo_set_rx_mode	= smsc95xx_set_multicast,
1144	.ndo_set_features	= smsc95xx_set_features,
1145};
1146
1147static void smsc95xx_handle_link_change(struct net_device *net)
1148{
1149	struct usbnet *dev = netdev_priv(net);
1150
1151	phy_print_status(net->phydev);
1152	smsc95xx_mac_update_fullduplex(dev);
1153	usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1154}
1155
1156static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1157{
1158	struct smsc95xx_priv *pdata;
1159	char usb_path[64];
1160	int ret, phy_irq;
1161	u32 val;
1162
1163	printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1164
1165	ret = usbnet_get_endpoints(dev, intf);
1166	if (ret < 0) {
1167		netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1168		return ret;
1169	}
1170
1171	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1172	if (!pdata)
1173		return -ENOMEM;
1174
1175	dev->driver_priv = pdata;
1176
1177	spin_lock_init(&pdata->mac_cr_lock);
1178
1179	/* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1180	 * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1181	 * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1182	 * it is transmitted as all ones. The zero transmitted checksum means
1183	 * transmitter generated no checksum. Hence, enable csum offload only
1184	 * for ipv4 packets.
1185	 */
1186	if (DEFAULT_TX_CSUM_ENABLE)
1187		dev->net->features |= NETIF_F_IP_CSUM;
1188	if (DEFAULT_RX_CSUM_ENABLE)
1189		dev->net->features |= NETIF_F_RXCSUM;
1190
1191	dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1192	set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1193
1194	smsc95xx_init_mac_address(dev);
1195
1196	/* Init all registers */
1197	ret = smsc95xx_reset(dev);
1198	if (ret)
1199		goto free_pdata;
1200
1201	/* create irq domain for use by PHY driver and GPIO consumers */
1202	usb_make_path(dev->udev, usb_path, sizeof(usb_path));
1203	pdata->irqfwnode = irq_domain_alloc_named_fwnode(usb_path);
1204	if (!pdata->irqfwnode) {
1205		ret = -ENOMEM;
1206		goto free_pdata;
1207	}
1208
1209	pdata->irqdomain = irq_domain_create_linear(pdata->irqfwnode,
1210						    SMSC95XX_NR_IRQS,
1211						    &irq_domain_simple_ops,
1212						    pdata);
1213	if (!pdata->irqdomain) {
1214		ret = -ENOMEM;
1215		goto free_irqfwnode;
1216	}
1217
1218	phy_irq = irq_create_mapping(pdata->irqdomain, PHY_HWIRQ);
1219	if (!phy_irq) {
1220		ret = -ENOENT;
1221		goto remove_irqdomain;
1222	}
1223
1224	pdata->irqchip = dummy_irq_chip;
1225	pdata->irqchip.name = SMSC_CHIPNAME;
1226	irq_set_chip_and_handler_name(phy_irq, &pdata->irqchip,
1227				      handle_simple_irq, "phy");
1228
1229	pdata->mdiobus = mdiobus_alloc();
1230	if (!pdata->mdiobus) {
1231		ret = -ENOMEM;
1232		goto dispose_irq;
1233	}
1234
1235	ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1236	if (ret < 0)
1237		goto free_mdio;
1238
1239	pdata->is_internal_phy = !(val & HW_CFG_PSEL_);
1240	if (pdata->is_internal_phy)
1241		pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1242
1243	pdata->mdiobus->priv = dev;
1244	pdata->mdiobus->read = smsc95xx_mdiobus_read;
1245	pdata->mdiobus->write = smsc95xx_mdiobus_write;
1246	pdata->mdiobus->reset = smsc95xx_mdiobus_reset;
1247	pdata->mdiobus->name = "smsc95xx-mdiobus";
1248	pdata->mdiobus->parent = &dev->udev->dev;
1249
1250	snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1251		 "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1252
1253	ret = mdiobus_register(pdata->mdiobus);
1254	if (ret) {
1255		netdev_err(dev->net, "Could not register MDIO bus\n");
1256		goto free_mdio;
1257	}
1258
1259	pdata->phydev = phy_find_first(pdata->mdiobus);
1260	if (!pdata->phydev) {
1261		netdev_err(dev->net, "no PHY found\n");
1262		ret = -ENODEV;
1263		goto unregister_mdio;
1264	}
1265
1266	pdata->phydev->irq = phy_irq;
1267	pdata->phydev->is_internal = pdata->is_internal_phy;
1268
1269	/* detect device revision as different features may be available */
1270	ret = smsc95xx_read_reg(dev, ID_REV, &val);
1271	if (ret < 0)
1272		goto unregister_mdio;
1273
1274	val >>= 16;
1275	if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1276	    (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1277		pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1278			FEATURE_PHY_NLP_CROSSOVER |
1279			FEATURE_REMOTE_WAKEUP);
1280	else if (val == ID_REV_CHIP_ID_9512_)
1281		pdata->features = FEATURE_8_WAKEUP_FILTERS;
1282
1283	dev->net->netdev_ops = &smsc95xx_netdev_ops;
1284	dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1285	dev->net->flags |= IFF_MULTICAST;
1286	dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1287	dev->net->min_mtu = ETH_MIN_MTU;
1288	dev->net->max_mtu = ETH_DATA_LEN;
1289	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1290
1291	pdata->pause_tx = true;
1292	pdata->pause_rx = true;
1293	pdata->pause_autoneg = true;
1294	phy_support_asym_pause(pdata->phydev);
1295
1296	ret = phy_connect_direct(dev->net, pdata->phydev,
1297				 &smsc95xx_handle_link_change,
1298				 PHY_INTERFACE_MODE_MII);
1299	if (ret) {
1300		netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1301		goto unregister_mdio;
1302	}
1303
1304	phy_attached_info(dev->net->phydev);
1305
1306	return 0;
1307
1308unregister_mdio:
1309	mdiobus_unregister(pdata->mdiobus);
1310
1311free_mdio:
1312	mdiobus_free(pdata->mdiobus);
1313
1314dispose_irq:
1315	irq_dispose_mapping(phy_irq);
1316
1317remove_irqdomain:
1318	irq_domain_remove(pdata->irqdomain);
1319
1320free_irqfwnode:
1321	irq_domain_free_fwnode(pdata->irqfwnode);
1322
1323free_pdata:
1324	kfree(pdata);
1325	return ret;
1326}
1327
1328static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1329{
1330	struct smsc95xx_priv *pdata = dev->driver_priv;
1331
1332	phy_disconnect(dev->net->phydev);
1333	mdiobus_unregister(pdata->mdiobus);
1334	mdiobus_free(pdata->mdiobus);
1335	irq_dispose_mapping(irq_find_mapping(pdata->irqdomain, PHY_HWIRQ));
1336	irq_domain_remove(pdata->irqdomain);
1337	irq_domain_free_fwnode(pdata->irqfwnode);
1338	netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1339	kfree(pdata);
1340}
1341
1342static int smsc95xx_start_phy(struct usbnet *dev)
1343{
1344	phy_start(dev->net->phydev);
1345
1346	return 0;
1347}
1348
1349static int smsc95xx_stop(struct usbnet *dev)
1350{
1351	phy_stop(dev->net->phydev);
1352
1353	return 0;
1354}
1355
1356static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1357{
1358	u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1359	return crc << ((filter % 2) * 16);
1360}
1361
1362static int smsc95xx_link_ok(struct usbnet *dev)
1363{
1364	struct smsc95xx_priv *pdata = dev->driver_priv;
1365	int ret;
1366
1367	/* first, a dummy read, needed to latch some MII phys */
1368	ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1369	if (ret < 0)
1370		return ret;
1371
1372	ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1373	if (ret < 0)
1374		return ret;
1375
1376	return !!(ret & BMSR_LSTATUS);
1377}
1378
1379static int smsc95xx_enter_suspend0(struct usbnet *dev)
1380{
1381	struct smsc95xx_priv *pdata = dev->driver_priv;
1382	u32 val;
1383	int ret;
1384
1385	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1386	if (ret < 0)
1387		return ret;
1388
1389	val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1390	val |= PM_CTL_SUS_MODE_0;
1391
1392	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1393	if (ret < 0)
1394		return ret;
1395
1396	/* clear wol status */
1397	val &= ~PM_CTL_WUPS_;
1398	val |= PM_CTL_WUPS_WOL_;
1399
1400	/* enable energy detection */
1401	if (pdata->wolopts & WAKE_PHY)
1402		val |= PM_CTL_WUPS_ED_;
1403
1404	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1405	if (ret < 0)
1406		return ret;
1407
1408	/* read back PM_CTRL */
1409	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1410	if (ret < 0)
1411		return ret;
1412
1413	pdata->suspend_flags |= SUSPEND_SUSPEND0;
1414
1415	return 0;
1416}
1417
1418static int smsc95xx_enter_suspend1(struct usbnet *dev)
1419{
1420	struct smsc95xx_priv *pdata = dev->driver_priv;
1421	int ret, phy_id = pdata->phydev->mdio.addr;
1422	u32 val;
1423
1424	/* reconfigure link pulse detection timing for
1425	 * compatibility with non-standard link partners
1426	 */
1427	if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1428		smsc95xx_mdio_write(dev, phy_id, PHY_EDPD_CONFIG,
1429				    PHY_EDPD_CONFIG_DEFAULT);
1430
1431	/* enable energy detect power-down mode */
1432	ret = smsc95xx_mdio_read(dev, phy_id, PHY_MODE_CTRL_STS);
1433	if (ret < 0)
1434		return ret;
1435
1436	ret |= MODE_CTRL_STS_EDPWRDOWN_;
1437
1438	smsc95xx_mdio_write(dev, phy_id, PHY_MODE_CTRL_STS, ret);
1439
1440	/* enter SUSPEND1 mode */
1441	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1442	if (ret < 0)
1443		return ret;
1444
1445	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1446	val |= PM_CTL_SUS_MODE_1;
1447
1448	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1449	if (ret < 0)
1450		return ret;
1451
1452	/* clear wol status, enable energy detection */
1453	val &= ~PM_CTL_WUPS_;
1454	val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1455
1456	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1457	if (ret < 0)
1458		return ret;
1459
1460	pdata->suspend_flags |= SUSPEND_SUSPEND1;
1461
1462	return 0;
1463}
1464
1465static int smsc95xx_enter_suspend2(struct usbnet *dev)
1466{
1467	struct smsc95xx_priv *pdata = dev->driver_priv;
1468	u32 val;
1469	int ret;
1470
1471	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1472	if (ret < 0)
1473		return ret;
1474
1475	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1476	val |= PM_CTL_SUS_MODE_2;
1477
1478	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1479	if (ret < 0)
1480		return ret;
1481
1482	pdata->suspend_flags |= SUSPEND_SUSPEND2;
1483
1484	return 0;
1485}
1486
1487static int smsc95xx_enter_suspend3(struct usbnet *dev)
1488{
1489	struct smsc95xx_priv *pdata = dev->driver_priv;
1490	u32 val;
1491	int ret;
1492
1493	ret = smsc95xx_read_reg(dev, RX_FIFO_INF, &val);
1494	if (ret < 0)
1495		return ret;
1496
1497	if (val & RX_FIFO_INF_USED_) {
1498		netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1499		return -EBUSY;
1500	}
1501
1502	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1503	if (ret < 0)
1504		return ret;
1505
1506	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1507	val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1508
1509	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1510	if (ret < 0)
1511		return ret;
1512
1513	/* clear wol status */
1514	val &= ~PM_CTL_WUPS_;
1515	val |= PM_CTL_WUPS_WOL_;
1516
1517	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1518	if (ret < 0)
1519		return ret;
1520
1521	pdata->suspend_flags |= SUSPEND_SUSPEND3;
1522
1523	return 0;
1524}
1525
1526static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1527{
1528	struct smsc95xx_priv *pdata = dev->driver_priv;
1529
1530	if (!netif_running(dev->net)) {
1531		/* interface is ifconfig down so fully power down hw */
1532		netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1533		return smsc95xx_enter_suspend2(dev);
1534	}
1535
1536	if (!link_up) {
1537		/* link is down so enter EDPD mode, but only if device can
1538		 * reliably resume from it.  This check should be redundant
1539		 * as current FEATURE_REMOTE_WAKEUP parts also support
1540		 * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1541		if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1542			netdev_warn(dev->net, "EDPD not supported\n");
1543			return -EBUSY;
1544		}
1545
1546		netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1547		netdev_info(dev->net, "entering SUSPEND1 mode\n");
1548		return smsc95xx_enter_suspend1(dev);
1549	}
1550
1551	netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1552	return smsc95xx_enter_suspend3(dev);
1553}
1554
1555static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1556{
1557	struct usbnet *dev = usb_get_intfdata(intf);
1558	struct smsc95xx_priv *pdata = dev->driver_priv;
1559	u32 val, link_up;
1560	int ret;
1561
1562	pdata->pm_task = current;
1563
1564	ret = usbnet_suspend(intf, message);
1565	if (ret < 0) {
1566		netdev_warn(dev->net, "usbnet_suspend error\n");
1567		pdata->pm_task = NULL;
1568		return ret;
1569	}
1570
1571	if (pdata->suspend_flags) {
1572		netdev_warn(dev->net, "error during last resume\n");
1573		pdata->suspend_flags = 0;
1574	}
1575
1576	link_up = smsc95xx_link_ok(dev);
1577
1578	if (message.event == PM_EVENT_AUTO_SUSPEND &&
1579	    (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1580		ret = smsc95xx_autosuspend(dev, link_up);
1581		goto done;
1582	}
1583
1584	/* if we get this far we're not autosuspending */
1585	/* if no wol options set, or if link is down and we're not waking on
1586	 * PHY activity, enter lowest power SUSPEND2 mode
1587	 */
1588	if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1589		!(link_up || (pdata->wolopts & WAKE_PHY))) {
1590		netdev_info(dev->net, "entering SUSPEND2 mode\n");
1591
1592		/* disable energy detect (link up) & wake up events */
1593		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1594		if (ret < 0)
1595			goto done;
1596
1597		val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1598
1599		ret = smsc95xx_write_reg(dev, WUCSR, val);
1600		if (ret < 0)
1601			goto done;
1602
1603		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1604		if (ret < 0)
1605			goto done;
1606
1607		val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1608
1609		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1610		if (ret < 0)
1611			goto done;
1612
1613		ret = smsc95xx_enter_suspend2(dev);
1614		goto done;
1615	}
1616
1617	if (pdata->wolopts & WAKE_PHY) {
1618		/* if link is down then configure EDPD and enter SUSPEND1,
1619		 * otherwise enter SUSPEND0 below
1620		 */
1621		if (!link_up) {
1622			netdev_info(dev->net, "entering SUSPEND1 mode\n");
1623			ret = smsc95xx_enter_suspend1(dev);
1624			goto done;
1625		}
1626	}
1627
1628	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1629		u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1630		u32 command[2];
1631		u32 offset[2];
1632		u32 crc[4];
1633		int wuff_filter_count =
1634			(pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1635			LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1636		int i, filter = 0;
1637
1638		if (!filter_mask) {
1639			netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1640			ret = -ENOMEM;
1641			goto done;
1642		}
1643
1644		memset(command, 0, sizeof(command));
1645		memset(offset, 0, sizeof(offset));
1646		memset(crc, 0, sizeof(crc));
1647
1648		if (pdata->wolopts & WAKE_BCAST) {
1649			const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1650			netdev_info(dev->net, "enabling broadcast detection\n");
1651			filter_mask[filter * 4] = 0x003F;
1652			filter_mask[filter * 4 + 1] = 0x00;
1653			filter_mask[filter * 4 + 2] = 0x00;
1654			filter_mask[filter * 4 + 3] = 0x00;
1655			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1656			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1657			crc[filter/2] |= smsc_crc(bcast, 6, filter);
1658			filter++;
1659		}
1660
1661		if (pdata->wolopts & WAKE_MCAST) {
1662			const u8 mcast[] = {0x01, 0x00, 0x5E};
1663			netdev_info(dev->net, "enabling multicast detection\n");
1664			filter_mask[filter * 4] = 0x0007;
1665			filter_mask[filter * 4 + 1] = 0x00;
1666			filter_mask[filter * 4 + 2] = 0x00;
1667			filter_mask[filter * 4 + 3] = 0x00;
1668			command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1669			offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1670			crc[filter/2] |= smsc_crc(mcast, 3, filter);
1671			filter++;
1672		}
1673
1674		if (pdata->wolopts & WAKE_ARP) {
1675			const u8 arp[] = {0x08, 0x06};
1676			netdev_info(dev->net, "enabling ARP detection\n");
1677			filter_mask[filter * 4] = 0x0003;
1678			filter_mask[filter * 4 + 1] = 0x00;
1679			filter_mask[filter * 4 + 2] = 0x00;
1680			filter_mask[filter * 4 + 3] = 0x00;
1681			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1682			offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1683			crc[filter/2] |= smsc_crc(arp, 2, filter);
1684			filter++;
1685		}
1686
1687		if (pdata->wolopts & WAKE_UCAST) {
1688			netdev_info(dev->net, "enabling unicast detection\n");
1689			filter_mask[filter * 4] = 0x003F;
1690			filter_mask[filter * 4 + 1] = 0x00;
1691			filter_mask[filter * 4 + 2] = 0x00;
1692			filter_mask[filter * 4 + 3] = 0x00;
1693			command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1694			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1695			crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1696			filter++;
1697		}
1698
1699		for (i = 0; i < (wuff_filter_count * 4); i++) {
1700			ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]);
1701			if (ret < 0) {
1702				kfree(filter_mask);
1703				goto done;
1704			}
1705		}
1706		kfree(filter_mask);
1707
1708		for (i = 0; i < (wuff_filter_count / 4); i++) {
1709			ret = smsc95xx_write_reg(dev, WUFF, command[i]);
1710			if (ret < 0)
1711				goto done;
1712		}
1713
1714		for (i = 0; i < (wuff_filter_count / 4); i++) {
1715			ret = smsc95xx_write_reg(dev, WUFF, offset[i]);
1716			if (ret < 0)
1717				goto done;
1718		}
1719
1720		for (i = 0; i < (wuff_filter_count / 2); i++) {
1721			ret = smsc95xx_write_reg(dev, WUFF, crc[i]);
1722			if (ret < 0)
1723				goto done;
1724		}
1725
1726		/* clear any pending pattern match packet status */
1727		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1728		if (ret < 0)
1729			goto done;
1730
1731		val |= WUCSR_WUFR_;
1732
1733		ret = smsc95xx_write_reg(dev, WUCSR, val);
1734		if (ret < 0)
1735			goto done;
1736	}
1737
1738	if (pdata->wolopts & WAKE_MAGIC) {
1739		/* clear any pending magic packet status */
1740		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1741		if (ret < 0)
1742			goto done;
1743
1744		val |= WUCSR_MPR_;
1745
1746		ret = smsc95xx_write_reg(dev, WUCSR, val);
1747		if (ret < 0)
1748			goto done;
1749	}
1750
1751	/* enable/disable wakeup sources */
1752	ret = smsc95xx_read_reg(dev, WUCSR, &val);
1753	if (ret < 0)
1754		goto done;
1755
1756	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1757		netdev_info(dev->net, "enabling pattern match wakeup\n");
1758		val |= WUCSR_WAKE_EN_;
1759	} else {
1760		netdev_info(dev->net, "disabling pattern match wakeup\n");
1761		val &= ~WUCSR_WAKE_EN_;
1762	}
1763
1764	if (pdata->wolopts & WAKE_MAGIC) {
1765		netdev_info(dev->net, "enabling magic packet wakeup\n");
1766		val |= WUCSR_MPEN_;
1767	} else {
1768		netdev_info(dev->net, "disabling magic packet wakeup\n");
1769		val &= ~WUCSR_MPEN_;
1770	}
1771
1772	ret = smsc95xx_write_reg(dev, WUCSR, val);
1773	if (ret < 0)
1774		goto done;
1775
1776	/* enable wol wakeup source */
1777	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1778	if (ret < 0)
1779		goto done;
1780
1781	val |= PM_CTL_WOL_EN_;
1782
1783	/* phy energy detect wakeup source */
1784	if (pdata->wolopts & WAKE_PHY)
1785		val |= PM_CTL_ED_EN_;
1786
1787	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1788	if (ret < 0)
1789		goto done;
1790
1791	/* enable receiver to enable frame reception */
1792	smsc95xx_start_rx_path(dev);
1793
1794	/* some wol options are enabled, so enter SUSPEND0 */
1795	netdev_info(dev->net, "entering SUSPEND0 mode\n");
1796	ret = smsc95xx_enter_suspend0(dev);
1797
1798done:
1799	/*
1800	 * TODO: resume() might need to handle the suspend failure
1801	 * in system sleep
1802	 */
1803	if (ret && PMSG_IS_AUTO(message))
1804		usbnet_resume(intf);
1805
1806	pdata->pm_task = NULL;
1807	return ret;
1808}
1809
1810static int smsc95xx_resume(struct usb_interface *intf)
1811{
1812	struct usbnet *dev = usb_get_intfdata(intf);
1813	struct smsc95xx_priv *pdata;
1814	u8 suspend_flags;
1815	int ret;
1816	u32 val;
1817
1818	BUG_ON(!dev);
1819	pdata = dev->driver_priv;
1820	suspend_flags = pdata->suspend_flags;
1821
1822	netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1823
1824	/* do this first to ensure it's cleared even in error case */
1825	pdata->suspend_flags = 0;
1826
1827	pdata->pm_task = current;
1828
1829	if (suspend_flags & SUSPEND_ALLMODES) {
1830		/* clear wake-up sources */
1831		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1832		if (ret < 0)
1833			goto done;
1834
1835		val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1836
1837		ret = smsc95xx_write_reg(dev, WUCSR, val);
1838		if (ret < 0)
1839			goto done;
1840
1841		/* clear wake-up status */
1842		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1843		if (ret < 0)
1844			goto done;
1845
1846		val &= ~PM_CTL_WOL_EN_;
1847		val |= PM_CTL_WUPS_;
1848
1849		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1850		if (ret < 0)
1851			goto done;
1852	}
1853
1854	phy_init_hw(pdata->phydev);
1855
1856	ret = usbnet_resume(intf);
1857	if (ret < 0)
1858		netdev_warn(dev->net, "usbnet_resume error\n");
1859
1860done:
1861	pdata->pm_task = NULL;
1862	return ret;
1863}
1864
1865static int smsc95xx_reset_resume(struct usb_interface *intf)
1866{
1867	struct usbnet *dev = usb_get_intfdata(intf);
1868	struct smsc95xx_priv *pdata = dev->driver_priv;
1869	int ret;
1870
1871	pdata->pm_task = current;
1872	ret = smsc95xx_reset(dev);
1873	pdata->pm_task = NULL;
1874	if (ret < 0)
1875		return ret;
1876
1877	return smsc95xx_resume(intf);
1878}
1879
1880static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1881{
1882	u16 *csum_ptr = (u16 *)(skb_tail_pointer(skb) - 2);
1883
1884	skb->csum = (__force __wsum)get_unaligned(csum_ptr);
1885	skb->ip_summed = CHECKSUM_COMPLETE;
1886	skb_trim(skb, skb->len - 2); /* remove csum */
1887}
1888
1889static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1890{
1891	/* This check is no longer done by usbnet */
1892	if (skb->len < dev->net->hard_header_len)
1893		return 0;
1894
1895	while (skb->len > 0) {
1896		u32 header, align_count;
1897		struct sk_buff *ax_skb;
1898		unsigned char *packet;
1899		u16 size;
1900
1901		header = get_unaligned_le32(skb->data);
1902		skb_pull(skb, 4 + NET_IP_ALIGN);
1903		packet = skb->data;
1904
1905		/* get the packet length */
1906		size = (u16)((header & RX_STS_FL_) >> 16);
1907		align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1908
1909		if (unlikely(size > skb->len)) {
1910			netif_dbg(dev, rx_err, dev->net,
1911				  "size err header=0x%08x\n", header);
1912			return 0;
1913		}
1914
1915		if (unlikely(header & RX_STS_ES_)) {
1916			netif_dbg(dev, rx_err, dev->net,
1917				  "Error header=0x%08x\n", header);
1918			dev->net->stats.rx_errors++;
1919			dev->net->stats.rx_dropped++;
1920
1921			if (header & RX_STS_CRC_) {
1922				dev->net->stats.rx_crc_errors++;
1923			} else {
1924				if (header & (RX_STS_TL_ | RX_STS_RF_))
1925					dev->net->stats.rx_frame_errors++;
1926
1927				if ((header & RX_STS_LE_) &&
1928					(!(header & RX_STS_FT_)))
1929					dev->net->stats.rx_length_errors++;
1930			}
1931		} else {
1932			/* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1933			if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1934				netif_dbg(dev, rx_err, dev->net,
1935					  "size err header=0x%08x\n", header);
1936				return 0;
1937			}
1938
1939			/* last frame in this batch */
1940			if (skb->len == size) {
1941				if (dev->net->features & NETIF_F_RXCSUM)
1942					smsc95xx_rx_csum_offload(skb);
1943				skb_trim(skb, skb->len - 4); /* remove fcs */
1944
1945				return 1;
1946			}
1947
1948			ax_skb = netdev_alloc_skb_ip_align(dev->net, size);
1949			if (unlikely(!ax_skb)) {
1950				netdev_warn(dev->net, "Error allocating skb\n");
1951				return 0;
1952			}
1953
1954			skb_put(ax_skb, size);
1955			memcpy(ax_skb->data, packet, size);
1956
1957			if (dev->net->features & NETIF_F_RXCSUM)
1958				smsc95xx_rx_csum_offload(ax_skb);
1959			skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1960
1961			usbnet_skb_return(dev, ax_skb);
1962		}
1963
1964		skb_pull(skb, size);
1965
1966		/* padding bytes before the next frame starts */
1967		if (skb->len)
1968			skb_pull(skb, align_count);
1969	}
1970
1971	return 1;
1972}
1973
1974static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1975{
1976	u16 low_16 = (u16)skb_checksum_start_offset(skb);
1977	u16 high_16 = low_16 + skb->csum_offset;
1978	return (high_16 << 16) | low_16;
1979}
1980
1981/* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1982 * transmission. This is fairly unlikely, only seems to trigger with some
1983 * short TCP ACK packets sent.
1984 *
1985 * Note, this calculation should probably check for the alignment of the
1986 * data as well, but a straight check for csum being in the last four bytes
1987 * of the packet should be ok for now.
1988 */
1989static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1990{
1991       unsigned int len = skb->len - skb_checksum_start_offset(skb);
1992
1993       if (skb->len <= 45)
1994	       return false;
1995       return skb->csum_offset < (len - (4 + 1));
1996}
1997
1998static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1999					 struct sk_buff *skb, gfp_t flags)
2000{
2001	bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
2002	int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
2003	u32 tx_cmd_a, tx_cmd_b;
2004	void *ptr;
2005
2006	/* We do not advertise SG, so skbs should be already linearized */
2007	BUG_ON(skb_shinfo(skb)->nr_frags);
2008
2009	/* Make writable and expand header space by overhead if required */
2010	if (skb_cow_head(skb, overhead)) {
2011		/* Must deallocate here as returning NULL to indicate error
2012		 * means the skb won't be deallocated in the caller.
2013		 */
2014		dev_kfree_skb_any(skb);
2015		return NULL;
2016	}
2017
2018	tx_cmd_b = (u32)skb->len;
2019	tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
2020
2021	if (csum) {
2022		if (!smsc95xx_can_tx_checksum(skb)) {
2023			/* workaround - hardware tx checksum does not work
2024			 * properly with extremely small packets */
2025			long csstart = skb_checksum_start_offset(skb);
2026			__wsum calc = csum_partial(skb->data + csstart,
2027				skb->len - csstart, 0);
2028			*((__sum16 *)(skb->data + csstart
2029				+ skb->csum_offset)) = csum_fold(calc);
2030
2031			csum = false;
2032		} else {
2033			u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
2034			ptr = skb_push(skb, 4);
2035			put_unaligned_le32(csum_preamble, ptr);
2036
2037			tx_cmd_a += 4;
2038			tx_cmd_b += 4;
2039			tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
2040		}
2041	}
2042
2043	ptr = skb_push(skb, 8);
2044	put_unaligned_le32(tx_cmd_a, ptr);
2045	put_unaligned_le32(tx_cmd_b, ptr+4);
2046
2047	return skb;
2048}
2049
2050static int smsc95xx_manage_power(struct usbnet *dev, int on)
2051{
2052	struct smsc95xx_priv *pdata = dev->driver_priv;
2053
2054	dev->intf->needs_remote_wakeup = on;
2055
2056	if (pdata->features & FEATURE_REMOTE_WAKEUP)
2057		return 0;
2058
2059	/* this chip revision isn't capable of remote wakeup */
2060	netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
2061
2062	if (on)
2063		usb_autopm_get_interface_no_resume(dev->intf);
2064	else
2065		usb_autopm_put_interface(dev->intf);
2066
2067	return 0;
2068}
2069
2070static const struct driver_info smsc95xx_info = {
2071	.description	= "smsc95xx USB 2.0 Ethernet",
2072	.bind		= smsc95xx_bind,
2073	.unbind		= smsc95xx_unbind,
2074	.reset		= smsc95xx_reset,
2075	.check_connect	= smsc95xx_start_phy,
2076	.stop		= smsc95xx_stop,
2077	.rx_fixup	= smsc95xx_rx_fixup,
2078	.tx_fixup	= smsc95xx_tx_fixup,
2079	.status		= smsc95xx_status,
2080	.manage_power	= smsc95xx_manage_power,
2081	.flags		= FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2082};
2083
2084static const struct usb_device_id products[] = {
2085	{
2086		/* SMSC9500 USB Ethernet Device */
2087		USB_DEVICE(0x0424, 0x9500),
2088		.driver_info = (unsigned long) &smsc95xx_info,
2089	},
2090	{
2091		/* SMSC9505 USB Ethernet Device */
2092		USB_DEVICE(0x0424, 0x9505),
2093		.driver_info = (unsigned long) &smsc95xx_info,
2094	},
2095	{
2096		/* SMSC9500A USB Ethernet Device */
2097		USB_DEVICE(0x0424, 0x9E00),
2098		.driver_info = (unsigned long) &smsc95xx_info,
2099	},
2100	{
2101		/* SMSC9505A USB Ethernet Device */
2102		USB_DEVICE(0x0424, 0x9E01),
2103		.driver_info = (unsigned long) &smsc95xx_info,
2104	},
2105	{
2106		/* SMSC9512/9514 USB Hub & Ethernet Device */
2107		USB_DEVICE(0x0424, 0xec00),
2108		.driver_info = (unsigned long) &smsc95xx_info,
2109	},
2110	{
2111		/* SMSC9500 USB Ethernet Device (SAL10) */
2112		USB_DEVICE(0x0424, 0x9900),
2113		.driver_info = (unsigned long) &smsc95xx_info,
2114	},
2115	{
2116		/* SMSC9505 USB Ethernet Device (SAL10) */
2117		USB_DEVICE(0x0424, 0x9901),
2118		.driver_info = (unsigned long) &smsc95xx_info,
2119	},
2120	{
2121		/* SMSC9500A USB Ethernet Device (SAL10) */
2122		USB_DEVICE(0x0424, 0x9902),
2123		.driver_info = (unsigned long) &smsc95xx_info,
2124	},
2125	{
2126		/* SMSC9505A USB Ethernet Device (SAL10) */
2127		USB_DEVICE(0x0424, 0x9903),
2128		.driver_info = (unsigned long) &smsc95xx_info,
2129	},
2130	{
2131		/* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2132		USB_DEVICE(0x0424, 0x9904),
2133		.driver_info = (unsigned long) &smsc95xx_info,
2134	},
2135	{
2136		/* SMSC9500A USB Ethernet Device (HAL) */
2137		USB_DEVICE(0x0424, 0x9905),
2138		.driver_info = (unsigned long) &smsc95xx_info,
2139	},
2140	{
2141		/* SMSC9505A USB Ethernet Device (HAL) */
2142		USB_DEVICE(0x0424, 0x9906),
2143		.driver_info = (unsigned long) &smsc95xx_info,
2144	},
2145	{
2146		/* SMSC9500 USB Ethernet Device (Alternate ID) */
2147		USB_DEVICE(0x0424, 0x9907),
2148		.driver_info = (unsigned long) &smsc95xx_info,
2149	},
2150	{
2151		/* SMSC9500A USB Ethernet Device (Alternate ID) */
2152		USB_DEVICE(0x0424, 0x9908),
2153		.driver_info = (unsigned long) &smsc95xx_info,
2154	},
2155	{
2156		/* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2157		USB_DEVICE(0x0424, 0x9909),
2158		.driver_info = (unsigned long) &smsc95xx_info,
2159	},
2160	{
2161		/* SMSC LAN9530 USB Ethernet Device */
2162		USB_DEVICE(0x0424, 0x9530),
2163		.driver_info = (unsigned long) &smsc95xx_info,
2164	},
2165	{
2166		/* SMSC LAN9730 USB Ethernet Device */
2167		USB_DEVICE(0x0424, 0x9730),
2168		.driver_info = (unsigned long) &smsc95xx_info,
2169	},
2170	{
2171		/* SMSC LAN89530 USB Ethernet Device */
2172		USB_DEVICE(0x0424, 0x9E08),
2173		.driver_info = (unsigned long) &smsc95xx_info,
2174	},
2175	{
2176		/* SYSTEC USB-SPEmodule1 10BASE-T1L Ethernet Device */
2177		USB_DEVICE(0x0878, 0x1400),
2178		.driver_info = (unsigned long)&smsc95xx_info,
2179	},
2180	{
2181		/* Microchip's EVB-LAN8670-USB 10BASE-T1S Ethernet Device */
2182		USB_DEVICE(0x184F, 0x0051),
2183		.driver_info = (unsigned long)&smsc95xx_info,
2184	},
2185	{ },		/* END */
2186};
2187MODULE_DEVICE_TABLE(usb, products);
2188
2189static struct usb_driver smsc95xx_driver = {
2190	.name		= "smsc95xx",
2191	.id_table	= products,
2192	.probe		= usbnet_probe,
2193	.suspend	= smsc95xx_suspend,
2194	.resume		= smsc95xx_resume,
2195	.reset_resume	= smsc95xx_reset_resume,
2196	.disconnect	= usbnet_disconnect,
2197	.disable_hub_initiated_lpm = 1,
2198	.supports_autosuspend = 1,
2199};
2200
2201module_usb_driver(smsc95xx_driver);
2202
2203MODULE_AUTHOR("Nancy Lin");
2204MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2205MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2206MODULE_LICENSE("GPL");
~/ Read-only file preview.