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	spinlock_t mac_cr_lock;
  67	u8 features;
  68	u8 suspend_flags;
  69	bool is_internal_phy;
  70	struct irq_chip irqchip;
  71	struct irq_domain *irqdomain;
  72	struct fwnode_handle *irqfwnode;
  73	struct mii_bus *mdiobus;
  74	struct phy_device *phydev;
  75	struct task_struct *pm_task;
  76};
  77
  78static bool turbo_mode = true;
  79module_param(turbo_mode, bool, 0644);
  80MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  81
  82static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
  83					  u32 *data)
  84{
  85	struct smsc95xx_priv *pdata = dev->driver_priv;
  86	u32 buf;
  87	int ret;
  88	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  89
  90	if (current != pdata->pm_task)
  91		fn = usbnet_read_cmd;
  92	else
  93		fn = usbnet_read_cmd_nopm;
  94
  95	ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  96		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  97		 0, index, &buf, 4);
  98	if (ret < 4) {
  99		ret = ret < 0 ? ret : -ENODATA;
 100
 101		if (ret != -ENODEV)
 102			netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
 103				    index, ret);
 104		return ret;
 105	}
 106
 107	le32_to_cpus(&buf);
 108	*data = buf;
 109
 110	return ret;
 111}
 112
 113static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 114					   u32 data)
 115{
 116	struct smsc95xx_priv *pdata = dev->driver_priv;
 117	u32 buf;
 118	int ret;
 119	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 120
 121	if (current != pdata->pm_task)
 122		fn = usbnet_write_cmd;
 123	else
 124		fn = usbnet_write_cmd_nopm;
 125
 126	buf = data;
 127	cpu_to_le32s(&buf);
 128
 129	ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 130		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 131		 0, index, &buf, 4);
 132	if (ret < 0 && ret != -ENODEV)
 133		netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 134			    index, ret);
 135
 136	return ret;
 137}
 138
 139/* Loop until the read is completed with timeout
 140 * called with phy_mutex held */
 141static int __must_check smsc95xx_phy_wait_not_busy(struct usbnet *dev)
 142{
 143	unsigned long start_time = jiffies;
 144	u32 val;
 145	int ret;
 146
 147	do {
 148		ret = smsc95xx_read_reg(dev, MII_ADDR, &val);
 149		if (ret < 0) {
 150			/* Ignore -ENODEV error during disconnect() */
 151			if (ret == -ENODEV)
 152				return 0;
 153			netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 154			return ret;
 155		}
 156
 157		if (!(val & MII_BUSY_))
 158			return 0;
 159	} while (!time_after(jiffies, start_time + HZ));
 160
 161	return -EIO;
 162}
 163
 164static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 165{
 166	return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 167}
 168
 169static int smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx)
 170{
 171	u32 val, addr;
 172	int ret;
 173
 174	mutex_lock(&dev->phy_mutex);
 175
 176	/* confirm MII not busy */
 177	ret = smsc95xx_phy_wait_not_busy(dev);
 178	if (ret < 0) {
 179		netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 180		goto done;
 181	}
 182
 183	/* set the address, index & direction (read from PHY) */
 184	addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 185	ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
 186	if (ret < 0) {
 187		if (ret != -ENODEV)
 188			netdev_warn(dev->net, "Error writing MII_ADDR\n");
 189		goto done;
 190	}
 191
 192	ret = smsc95xx_phy_wait_not_busy(dev);
 193	if (ret < 0) {
 194		netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 195		goto done;
 196	}
 197
 198	ret = smsc95xx_read_reg(dev, MII_DATA, &val);
 199	if (ret < 0) {
 200		if (ret != -ENODEV)
 201			netdev_warn(dev->net, "Error reading MII_DATA\n");
 202		goto done;
 203	}
 204
 205	ret = (u16)(val & 0xFFFF);
 206
 207done:
 208	mutex_unlock(&dev->phy_mutex);
 209
 210	/* Ignore -ENODEV error during disconnect() */
 211	if (ret == -ENODEV)
 212		return 0;
 213	return ret;
 214}
 215
 216static void smsc95xx_mdio_write(struct usbnet *dev, int phy_id, int idx,
 217				int regval)
 218{
 219	u32 val, addr;
 220	int ret;
 221
 222	mutex_lock(&dev->phy_mutex);
 223
 224	/* confirm MII not busy */
 225	ret = smsc95xx_phy_wait_not_busy(dev);
 226	if (ret < 0) {
 227		netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 228		goto done;
 229	}
 230
 231	val = regval;
 232	ret = smsc95xx_write_reg(dev, MII_DATA, val);
 233	if (ret < 0) {
 234		if (ret != -ENODEV)
 235			netdev_warn(dev->net, "Error writing MII_DATA\n");
 236		goto done;
 237	}
 238
 239	/* set the address, index & direction (write to PHY) */
 240	addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 241	ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
 242	if (ret < 0) {
 243		if (ret != -ENODEV)
 244			netdev_warn(dev->net, "Error writing MII_ADDR\n");
 245		goto done;
 246	}
 247
 248	ret = smsc95xx_phy_wait_not_busy(dev);
 249	if (ret < 0) {
 250		netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 251		goto done;
 252	}
 253
 254done:
 255	mutex_unlock(&dev->phy_mutex);
 256}
 257
 258static int smsc95xx_mdiobus_reset(struct mii_bus *bus)
 259{
 260	struct smsc95xx_priv *pdata;
 261	struct usbnet *dev;
 262	u32 val;
 263	int ret;
 264
 265	dev = bus->priv;
 266	pdata = dev->driver_priv;
 267
 268	if (pdata->is_internal_phy)
 269		return 0;
 270
 271	mutex_lock(&dev->phy_mutex);
 272
 273	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
 274	if (ret < 0)
 275		goto reset_out;
 276
 277	val |= PM_CTL_PHY_RST_;
 278
 279	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
 280	if (ret < 0)
 281		goto reset_out;
 282
 283	/* Driver has no knowledge at this point about the external PHY.
 284	 * The 802.3 specifies that the reset process shall
 285	 * be completed within 0.5 s.
 286	 */
 287	fsleep(500000);
 288
 289reset_out:
 290	mutex_unlock(&dev->phy_mutex);
 291
 292	return 0;
 293}
 294
 295static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 296{
 297	struct usbnet *dev = bus->priv;
 298
 299	return smsc95xx_mdio_read(dev, phy_id, idx);
 300}
 301
 302static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 303				  u16 regval)
 304{
 305	struct usbnet *dev = bus->priv;
 306
 307	smsc95xx_mdio_write(dev, phy_id, idx, regval);
 308	return 0;
 309}
 310
 311static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 312{
 313	unsigned long start_time = jiffies;
 314	u32 val;
 315	int ret;
 316
 317	do {
 318		ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 319		if (ret < 0) {
 320			netdev_warn(dev->net, "Error reading E2P_CMD\n");
 321			return ret;
 322		}
 323
 324		if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 325			break;
 326		udelay(40);
 327	} while (!time_after(jiffies, start_time + HZ));
 328
 329	if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 330		netdev_warn(dev->net, "EEPROM read operation timeout\n");
 331		return -EIO;
 332	}
 333
 334	return 0;
 335}
 336
 337static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 338{
 339	unsigned long start_time = jiffies;
 340	u32 val;
 341	int ret;
 342
 343	do {
 344		ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 345		if (ret < 0) {
 346			netdev_warn(dev->net, "Error reading E2P_CMD\n");
 347			return ret;
 348		}
 349
 350		if (!(val & E2P_CMD_BUSY_))
 351			return 0;
 352
 353		udelay(40);
 354	} while (!time_after(jiffies, start_time + HZ));
 355
 356	netdev_warn(dev->net, "EEPROM is busy\n");
 357	return -EIO;
 358}
 359
 360static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 361				u8 *data)
 362{
 363	u32 val;
 364	int i, ret;
 365
 366	BUG_ON(!dev);
 367	BUG_ON(!data);
 368
 369	ret = smsc95xx_eeprom_confirm_not_busy(dev);
 370	if (ret)
 371		return ret;
 372
 373	for (i = 0; i < length; i++) {
 374		val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 375		ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 376		if (ret < 0) {
 377			netdev_warn(dev->net, "Error writing E2P_CMD\n");
 378			return ret;
 379		}
 380
 381		ret = smsc95xx_wait_eeprom(dev);
 382		if (ret < 0)
 383			return ret;
 384
 385		ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 386		if (ret < 0) {
 387			netdev_warn(dev->net, "Error reading E2P_DATA\n");
 388			return ret;
 389		}
 390
 391		data[i] = val & 0xFF;
 392		offset++;
 393	}
 394
 395	return 0;
 396}
 397
 398static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 399				 u8 *data)
 400{
 401	u32 val;
 402	int i, ret;
 403
 404	BUG_ON(!dev);
 405	BUG_ON(!data);
 406
 407	ret = smsc95xx_eeprom_confirm_not_busy(dev);
 408	if (ret)
 409		return ret;
 410
 411	/* Issue write/erase enable command */
 412	val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 413	ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 414	if (ret < 0) {
 415		netdev_warn(dev->net, "Error writing E2P_DATA\n");
 416		return ret;
 417	}
 418
 419	ret = smsc95xx_wait_eeprom(dev);
 420	if (ret < 0)
 421		return ret;
 422
 423	for (i = 0; i < length; i++) {
 424
 425		/* Fill data register */
 426		val = data[i];
 427		ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 428		if (ret < 0) {
 429			netdev_warn(dev->net, "Error writing E2P_DATA\n");
 430			return ret;
 431		}
 432
 433		/* Send "write" command */
 434		val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 435		ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 436		if (ret < 0) {
 437			netdev_warn(dev->net, "Error writing E2P_CMD\n");
 438			return ret;
 439		}
 440
 441		ret = smsc95xx_wait_eeprom(dev);
 442		if (ret < 0)
 443			return ret;
 444
 445		offset++;
 446	}
 447
 448	return 0;
 449}
 450
 451static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 452						 u32 data)
 453{
 454	const u16 size = 4;
 455	u32 buf;
 456	int ret;
 457
 458	buf = data;
 459	cpu_to_le32s(&buf);
 460
 461	ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 462				     USB_DIR_OUT | USB_TYPE_VENDOR |
 463				     USB_RECIP_DEVICE,
 464				     0, index, &buf, size);
 465	if (ret < 0)
 466		netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 467			    ret);
 468	return ret;
 469}
 470
 471/* returns hash bit number for given MAC address
 472 * example:
 473 * 01 00 5E 00 00 01 -> returns bit number 31 */
 474static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 475{
 476	return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 477}
 478
 479static void smsc95xx_set_multicast(struct net_device *netdev)
 480{
 481	struct usbnet *dev = netdev_priv(netdev);
 482	struct smsc95xx_priv *pdata = dev->driver_priv;
 483	unsigned long flags;
 484	int ret;
 485
 486	pdata->hash_hi = 0;
 487	pdata->hash_lo = 0;
 488
 489	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 490
 491	if (dev->net->flags & IFF_PROMISC) {
 492		netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 493		pdata->mac_cr |= MAC_CR_PRMS_;
 494		pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 495	} else if (dev->net->flags & IFF_ALLMULTI) {
 496		netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 497		pdata->mac_cr |= MAC_CR_MCPAS_;
 498		pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 499	} else if (!netdev_mc_empty(dev->net)) {
 500		struct netdev_hw_addr *ha;
 501
 502		pdata->mac_cr |= MAC_CR_HPFILT_;
 503		pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 504
 505		netdev_for_each_mc_addr(ha, netdev) {
 506			u32 bitnum = smsc95xx_hash(ha->addr);
 507			u32 mask = 0x01 << (bitnum & 0x1F);
 508			if (bitnum & 0x20)
 509				pdata->hash_hi |= mask;
 510			else
 511				pdata->hash_lo |= mask;
 512		}
 513
 514		netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 515				   pdata->hash_hi, pdata->hash_lo);
 516	} else {
 517		netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 518		pdata->mac_cr &=
 519			~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 520	}
 521
 522	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 523
 524	/* Initiate async writes, as we can't wait for completion here */
 525	ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 526	if (ret < 0)
 527		netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 528
 529	ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 530	if (ret < 0)
 531		netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 532
 533	ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 534	if (ret < 0)
 535		netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 536}
 537
 538static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
 539{
 540	u32 flow = 0, afc_cfg;
 541	struct smsc95xx_priv *pdata = dev->driver_priv;
 542	bool tx_pause, rx_pause;
 543
 544	int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 545	if (ret < 0)
 546		return ret;
 547
 548	if (pdata->phydev->duplex == DUPLEX_FULL) {
 549		phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 550
 551		if (rx_pause)
 552			flow = 0xFFFF0002;
 553
 554		if (tx_pause) {
 555			afc_cfg |= 0xF;
 556			flow |= 0xFFFF0000;
 557		} else {
 558			afc_cfg &= ~0xF;
 559		}
 560
 561		netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 562			  rx_pause ? "enabled" : "disabled",
 563			  tx_pause ? "enabled" : "disabled");
 564	} else {
 565		netif_dbg(dev, link, dev->net, "half duplex\n");
 566		afc_cfg |= 0xF;
 567	}
 568
 569	ret = smsc95xx_write_reg(dev, FLOW, flow);
 570	if (ret < 0)
 571		return ret;
 572
 573	return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 574}
 575
 576static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
 577{
 578	struct smsc95xx_priv *pdata = dev->driver_priv;
 579	unsigned long flags;
 580	int ret;
 581
 582	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 583	if (pdata->phydev->duplex != DUPLEX_FULL) {
 584		pdata->mac_cr &= ~MAC_CR_FDPX_;
 585		pdata->mac_cr |= MAC_CR_RCVOWN_;
 586	} else {
 587		pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 588		pdata->mac_cr |= MAC_CR_FDPX_;
 589	}
 590	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 591
 592	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 593	if (ret < 0) {
 594		if (ret != -ENODEV)
 595			netdev_warn(dev->net,
 596				    "Error updating MAC full duplex mode\n");
 597		return;
 598	}
 599
 600	ret = smsc95xx_phy_update_flowcontrol(dev);
 601	if (ret < 0)
 602		netdev_warn(dev->net, "Error updating PHY flow control\n");
 603}
 604
 605static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 606{
 607	struct smsc95xx_priv *pdata = dev->driver_priv;
 608	unsigned long flags;
 609	u32 intdata;
 610
 611	if (urb->actual_length != 4) {
 612		netdev_warn(dev->net, "unexpected urb length %d\n",
 613			    urb->actual_length);
 614		return;
 615	}
 616
 617	intdata = get_unaligned_le32(urb->transfer_buffer);
 618	netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 619
 620	local_irq_save(flags);
 621
 622	if (intdata & INT_ENP_PHY_INT_)
 623		generic_handle_domain_irq(pdata->irqdomain, PHY_HWIRQ);
 624	else
 625		netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 626			    intdata);
 627
 628	local_irq_restore(flags);
 629}
 630
 631/* Enable or disable Tx & Rx checksum offload engines */
 632static int smsc95xx_set_features(struct net_device *netdev,
 633	netdev_features_t features)
 634{
 635	struct usbnet *dev = netdev_priv(netdev);
 636	u32 read_buf;
 637	int ret;
 638
 639	ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 640	if (ret < 0)
 641		return ret;
 642
 643	if (features & NETIF_F_IP_CSUM)
 644		read_buf |= Tx_COE_EN_;
 645	else
 646		read_buf &= ~Tx_COE_EN_;
 647
 648	if (features & NETIF_F_RXCSUM)
 649		read_buf |= Rx_COE_EN_;
 650	else
 651		read_buf &= ~Rx_COE_EN_;
 652
 653	ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 654	if (ret < 0)
 655		return ret;
 656
 657	netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 658	return 0;
 659}
 660
 661static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 662{
 663	return MAX_EEPROM_SIZE;
 664}
 665
 666static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 667				       struct ethtool_eeprom *ee, u8 *data)
 668{
 669	struct usbnet *dev = netdev_priv(netdev);
 670
 671	ee->magic = LAN95XX_EEPROM_MAGIC;
 672
 673	return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 674}
 675
 676static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 677				       struct ethtool_eeprom *ee, u8 *data)
 678{
 679	struct usbnet *dev = netdev_priv(netdev);
 680
 681	if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 682		netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 683			    ee->magic);
 684		return -EINVAL;
 685	}
 686
 687	return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 688}
 689
 690static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 691{
 692	/* all smsc95xx registers */
 693	return COE_CR - ID_REV + sizeof(u32);
 694}
 695
 696static void
 697smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 698			 void *buf)
 699{
 700	struct usbnet *dev = netdev_priv(netdev);
 701	unsigned int i, j;
 702	int retval;
 703	u32 *data = buf;
 704
 705	retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 706	if (retval < 0) {
 707		netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 708		return;
 709	}
 710
 711	for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 712		retval = smsc95xx_read_reg(dev, i, &data[j]);
 713		if (retval < 0) {
 714			netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 715			return;
 716		}
 717	}
 718}
 719
 720static void smsc95xx_ethtool_get_wol(struct net_device *net,
 721				     struct ethtool_wolinfo *wolinfo)
 722{
 723	struct usbnet *dev = netdev_priv(net);
 724	struct smsc95xx_priv *pdata = dev->driver_priv;
 725
 726	wolinfo->supported = SUPPORTED_WAKE;
 727	wolinfo->wolopts = pdata->wolopts;
 728}
 729
 730static int smsc95xx_ethtool_set_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	int ret;
 736
 737	if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 738		return -EINVAL;
 739
 740	pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 741
 742	ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 743	if (ret < 0)
 744		netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 745
 746	return ret;
 747}
 748
 749static u32 smsc95xx_get_link(struct net_device *net)
 750{
 751	phy_read_status(net->phydev);
 752	return net->phydev->link;
 753}
 754
 755static void smsc95xx_ethtool_get_strings(struct net_device *netdev, u32 sset,
 756					u8 *data)
 757{
 758	switch (sset) {
 759	case ETH_SS_TEST:
 760		net_selftest_get_strings(data);
 761		break;
 762	}
 763}
 764
 765static int smsc95xx_ethtool_get_sset_count(struct net_device *ndev, int sset)
 766{
 767	switch (sset) {
 768	case ETH_SS_TEST:
 769		return net_selftest_get_count();
 770	default:
 771		return -EOPNOTSUPP;
 772	}
 773}
 774
 775static const struct ethtool_ops smsc95xx_ethtool_ops = {
 776	.get_link	= smsc95xx_get_link,
 777	.nway_reset	= phy_ethtool_nway_reset,
 778	.get_drvinfo	= usbnet_get_drvinfo,
 779	.get_msglevel	= usbnet_get_msglevel,
 780	.set_msglevel	= usbnet_set_msglevel,
 781	.get_eeprom_len	= smsc95xx_ethtool_get_eeprom_len,
 782	.get_eeprom	= smsc95xx_ethtool_get_eeprom,
 783	.set_eeprom	= smsc95xx_ethtool_set_eeprom,
 784	.get_regs_len	= smsc95xx_ethtool_getregslen,
 785	.get_regs	= smsc95xx_ethtool_getregs,
 786	.get_wol	= smsc95xx_ethtool_get_wol,
 787	.set_wol	= smsc95xx_ethtool_set_wol,
 788	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
 789	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
 790	.get_ts_info	= ethtool_op_get_ts_info,
 791	.self_test	= net_selftest,
 792	.get_strings	= smsc95xx_ethtool_get_strings,
 793	.get_sset_count	= smsc95xx_ethtool_get_sset_count,
 794};
 795
 796static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 797{
 798	if (!netif_running(netdev))
 799		return -EINVAL;
 800
 801	return phy_mii_ioctl(netdev->phydev, rq, cmd);
 802}
 803
 804static void smsc95xx_init_mac_address(struct usbnet *dev)
 805{
 806	u8 addr[ETH_ALEN];
 807
 808	/* maybe the boot loader passed the MAC address in devicetree */
 809	if (!platform_get_ethdev_address(&dev->udev->dev, dev->net)) {
 810		if (is_valid_ether_addr(dev->net->dev_addr)) {
 811			/* device tree values are valid so use them */
 812			netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 813			return;
 814		}
 815	}
 816
 817	/* try reading mac address from EEPROM */
 818	if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN, addr) == 0) {
 819		eth_hw_addr_set(dev->net, addr);
 820		if (is_valid_ether_addr(dev->net->dev_addr)) {
 821			/* eeprom values are valid so use them */
 822			netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 823			return;
 824		}
 825	}
 826
 827	/* no useful static MAC address found. generate a random one */
 828	eth_hw_addr_random(dev->net);
 829	netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 830}
 831
 832static int smsc95xx_set_mac_address(struct usbnet *dev)
 833{
 834	u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 835		dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 836	u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 837	int ret;
 838
 839	ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 840	if (ret < 0)
 841		return ret;
 842
 843	return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 844}
 845
 846/* starts the TX path */
 847static int smsc95xx_start_tx_path(struct usbnet *dev)
 848{
 849	struct smsc95xx_priv *pdata = dev->driver_priv;
 850	unsigned long flags;
 851	int ret;
 852
 853	/* Enable Tx at MAC */
 854	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 855	pdata->mac_cr |= MAC_CR_TXEN_;
 856	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 857
 858	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 859	if (ret < 0)
 860		return ret;
 861
 862	/* Enable Tx at SCSRs */
 863	return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 864}
 865
 866/* Starts the Receive path */
 867static int smsc95xx_start_rx_path(struct usbnet *dev)
 868{
 869	struct smsc95xx_priv *pdata = dev->driver_priv;
 870	unsigned long flags;
 871
 872	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 873	pdata->mac_cr |= MAC_CR_RXEN_;
 874	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 875
 876	return smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 877}
 878
 879static int smsc95xx_reset(struct usbnet *dev)
 880{
 881	struct smsc95xx_priv *pdata = dev->driver_priv;
 882	u32 read_buf, write_buf, burst_cap;
 883	int ret = 0, timeout;
 884
 885	netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 886
 887	ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 888	if (ret < 0)
 889		return ret;
 890
 891	timeout = 0;
 892	do {
 893		msleep(10);
 894		ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 895		if (ret < 0)
 896			return ret;
 897		timeout++;
 898	} while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 899
 900	if (timeout >= 100) {
 901		netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 902		return -ETIMEDOUT;
 903	}
 904
 905	ret = smsc95xx_set_mac_address(dev);
 906	if (ret < 0)
 907		return ret;
 908
 909	netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 910		  dev->net->dev_addr);
 911
 912	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 913	if (ret < 0)
 914		return ret;
 915
 916	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 917		  read_buf);
 918
 919	read_buf |= HW_CFG_BIR_;
 920
 921	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 922	if (ret < 0)
 923		return ret;
 924
 925	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 926	if (ret < 0)
 927		return ret;
 928
 929	netif_dbg(dev, ifup, dev->net,
 930		  "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 931		  read_buf);
 932
 933	if (!turbo_mode) {
 934		burst_cap = 0;
 935		dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 936	} else if (dev->udev->speed == USB_SPEED_HIGH) {
 937		burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 938		dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 939	} else {
 940		burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 941		dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 942	}
 943
 944	netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 945		  (ulong)dev->rx_urb_size);
 946
 947	ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 948	if (ret < 0)
 949		return ret;
 950
 951	ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 952	if (ret < 0)
 953		return ret;
 954
 955	netif_dbg(dev, ifup, dev->net,
 956		  "Read Value from BURST_CAP after writing: 0x%08x\n",
 957		  read_buf);
 958
 959	ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 960	if (ret < 0)
 961		return ret;
 962
 963	ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 964	if (ret < 0)
 965		return ret;
 966
 967	netif_dbg(dev, ifup, dev->net,
 968		  "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 969		  read_buf);
 970
 971	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 972	if (ret < 0)
 973		return ret;
 974
 975	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 976		  read_buf);
 977
 978	if (turbo_mode)
 979		read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 980
 981	read_buf &= ~HW_CFG_RXDOFF_;
 982
 983	/* set Rx data offset=2, Make IP header aligns on word boundary. */
 984	read_buf |= NET_IP_ALIGN << 9;
 985
 986	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 987	if (ret < 0)
 988		return ret;
 989
 990	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 991	if (ret < 0)
 992		return ret;
 993
 994	netif_dbg(dev, ifup, dev->net,
 995		  "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 996
 997	ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 998	if (ret < 0)
 999		return ret;
1000
1001	ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1002	if (ret < 0)
1003		return ret;
1004	netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1005
1006	/* Configure GPIO pins as LED outputs */
1007	write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1008		LED_GPIO_CFG_FDX_LED;
1009	ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
1010	if (ret < 0)
1011		return ret;
1012
1013	/* Init Tx */
1014	ret = smsc95xx_write_reg(dev, FLOW, 0);
1015	if (ret < 0)
1016		return ret;
1017
1018	ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1019	if (ret < 0)
1020		return ret;
1021
1022	/* Don't need mac_cr_lock during initialisation */
1023	ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1024	if (ret < 0)
1025		return ret;
1026
1027	/* Init Rx */
1028	/* Set Vlan */
1029	ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1030	if (ret < 0)
1031		return ret;
1032
1033	/* Enable or disable checksum offload engines */
1034	ret = smsc95xx_set_features(dev->net, dev->net->features);
1035	if (ret < 0) {
1036		netdev_warn(dev->net, "Failed to set checksum offload features\n");
1037		return ret;
1038	}
1039
1040	smsc95xx_set_multicast(dev->net);
1041
1042	ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1043	if (ret < 0)
1044		return ret;
1045
1046	/* enable PHY interrupts */
1047	read_buf |= INT_EP_CTL_PHY_INT_;
1048
1049	ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1050	if (ret < 0)
1051		return ret;
1052
1053	ret = smsc95xx_start_tx_path(dev);
1054	if (ret < 0) {
1055		netdev_warn(dev->net, "Failed to start TX path\n");
1056		return ret;
1057	}
1058
1059	ret = smsc95xx_start_rx_path(dev);
1060	if (ret < 0) {
1061		netdev_warn(dev->net, "Failed to start RX path\n");
1062		return ret;
1063	}
1064
1065	netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1066	return 0;
1067}
1068
1069static const struct net_device_ops smsc95xx_netdev_ops = {
1070	.ndo_open		= usbnet_open,
1071	.ndo_stop		= usbnet_stop,
1072	.ndo_start_xmit		= usbnet_start_xmit,
1073	.ndo_tx_timeout		= usbnet_tx_timeout,
1074	.ndo_change_mtu		= usbnet_change_mtu,
1075	.ndo_get_stats64	= dev_get_tstats64,
1076	.ndo_set_mac_address 	= eth_mac_addr,
1077	.ndo_validate_addr	= eth_validate_addr,
1078	.ndo_eth_ioctl		= smsc95xx_ioctl,
1079	.ndo_set_rx_mode	= smsc95xx_set_multicast,
1080	.ndo_set_features	= smsc95xx_set_features,
1081};
1082
1083static void smsc95xx_handle_link_change(struct net_device *net)
1084{
1085	struct usbnet *dev = netdev_priv(net);
1086
1087	phy_print_status(net->phydev);
1088	smsc95xx_mac_update_fullduplex(dev);
1089	usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1090}
1091
1092static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1093{
1094	struct smsc95xx_priv *pdata;
1095	char usb_path[64];
1096	int ret, phy_irq;
1097	u32 val;
1098
1099	printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1100
1101	ret = usbnet_get_endpoints(dev, intf);
1102	if (ret < 0) {
1103		netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1104		return ret;
1105	}
1106
1107	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1108	if (!pdata)
1109		return -ENOMEM;
1110
1111	dev->driver_priv = pdata;
1112
1113	spin_lock_init(&pdata->mac_cr_lock);
1114
1115	/* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1116	 * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1117	 * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1118	 * it is transmitted as all ones. The zero transmitted checksum means
1119	 * transmitter generated no checksum. Hence, enable csum offload only
1120	 * for ipv4 packets.
1121	 */
1122	if (DEFAULT_TX_CSUM_ENABLE)
1123		dev->net->features |= NETIF_F_IP_CSUM;
1124	if (DEFAULT_RX_CSUM_ENABLE)
1125		dev->net->features |= NETIF_F_RXCSUM;
1126
1127	dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1128	set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1129
1130	smsc95xx_init_mac_address(dev);
1131
1132	/* Init all registers */
1133	ret = smsc95xx_reset(dev);
1134	if (ret)
1135		goto free_pdata;
1136
1137	/* create irq domain for use by PHY driver and GPIO consumers */
1138	usb_make_path(dev->udev, usb_path, sizeof(usb_path));
1139	pdata->irqfwnode = irq_domain_alloc_named_fwnode(usb_path);
1140	if (!pdata->irqfwnode) {
1141		ret = -ENOMEM;
1142		goto free_pdata;
1143	}
1144
1145	pdata->irqdomain = irq_domain_create_linear(pdata->irqfwnode,
1146						    SMSC95XX_NR_IRQS,
1147						    &irq_domain_simple_ops,
1148						    pdata);
1149	if (!pdata->irqdomain) {
1150		ret = -ENOMEM;
1151		goto free_irqfwnode;
1152	}
1153
1154	phy_irq = irq_create_mapping(pdata->irqdomain, PHY_HWIRQ);
1155	if (!phy_irq) {
1156		ret = -ENOENT;
1157		goto remove_irqdomain;
1158	}
1159
1160	pdata->irqchip = dummy_irq_chip;
1161	pdata->irqchip.name = SMSC_CHIPNAME;
1162	irq_set_chip_and_handler_name(phy_irq, &pdata->irqchip,
1163				      handle_simple_irq, "phy");
1164
1165	pdata->mdiobus = mdiobus_alloc();
1166	if (!pdata->mdiobus) {
1167		ret = -ENOMEM;
1168		goto dispose_irq;
1169	}
1170
1171	ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1172	if (ret < 0)
1173		goto free_mdio;
1174
1175	pdata->is_internal_phy = !(val & HW_CFG_PSEL_);
1176	if (pdata->is_internal_phy)
1177		pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1178
1179	pdata->mdiobus->priv = dev;
1180	pdata->mdiobus->read = smsc95xx_mdiobus_read;
1181	pdata->mdiobus->write = smsc95xx_mdiobus_write;
1182	pdata->mdiobus->reset = smsc95xx_mdiobus_reset;
1183	pdata->mdiobus->name = "smsc95xx-mdiobus";
1184	pdata->mdiobus->parent = &dev->udev->dev;
1185
1186	snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1187		 "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1188
1189	ret = mdiobus_register(pdata->mdiobus);
1190	if (ret) {
1191		netdev_err(dev->net, "Could not register MDIO bus\n");
1192		goto free_mdio;
1193	}
1194
1195	pdata->phydev = phy_find_first(pdata->mdiobus);
1196	if (!pdata->phydev) {
1197		netdev_err(dev->net, "no PHY found\n");
1198		ret = -ENODEV;
1199		goto unregister_mdio;
1200	}
1201
1202	pdata->phydev->irq = phy_irq;
1203	pdata->phydev->is_internal = pdata->is_internal_phy;
1204
1205	/* detect device revision as different features may be available */
1206	ret = smsc95xx_read_reg(dev, ID_REV, &val);
1207	if (ret < 0)
1208		goto unregister_mdio;
1209
1210	val >>= 16;
1211	if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1212	    (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1213		pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1214			FEATURE_PHY_NLP_CROSSOVER |
1215			FEATURE_REMOTE_WAKEUP);
1216	else if (val == ID_REV_CHIP_ID_9512_)
1217		pdata->features = FEATURE_8_WAKEUP_FILTERS;
1218
1219	dev->net->netdev_ops = &smsc95xx_netdev_ops;
1220	dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1221	dev->net->flags |= IFF_MULTICAST;
1222	dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1223	dev->net->min_mtu = ETH_MIN_MTU;
1224	dev->net->max_mtu = ETH_DATA_LEN;
1225	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1226
1227	ret = phy_connect_direct(dev->net, pdata->phydev,
1228				 &smsc95xx_handle_link_change,
1229				 PHY_INTERFACE_MODE_MII);
1230	if (ret) {
1231		netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1232		goto unregister_mdio;
1233	}
1234
1235	phy_attached_info(dev->net->phydev);
1236
1237	return 0;
1238
1239unregister_mdio:
1240	mdiobus_unregister(pdata->mdiobus);
1241
1242free_mdio:
1243	mdiobus_free(pdata->mdiobus);
1244
1245dispose_irq:
1246	irq_dispose_mapping(phy_irq);
1247
1248remove_irqdomain:
1249	irq_domain_remove(pdata->irqdomain);
1250
1251free_irqfwnode:
1252	irq_domain_free_fwnode(pdata->irqfwnode);
1253
1254free_pdata:
1255	kfree(pdata);
1256	return ret;
1257}
1258
1259static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1260{
1261	struct smsc95xx_priv *pdata = dev->driver_priv;
1262
1263	phy_disconnect(dev->net->phydev);
1264	mdiobus_unregister(pdata->mdiobus);
1265	mdiobus_free(pdata->mdiobus);
1266	irq_dispose_mapping(irq_find_mapping(pdata->irqdomain, PHY_HWIRQ));
1267	irq_domain_remove(pdata->irqdomain);
1268	irq_domain_free_fwnode(pdata->irqfwnode);
1269	netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1270	kfree(pdata);
1271}
1272
1273static int smsc95xx_start_phy(struct usbnet *dev)
1274{
1275	phy_start(dev->net->phydev);
1276
1277	return 0;
1278}
1279
1280static int smsc95xx_stop(struct usbnet *dev)
1281{
1282	phy_stop(dev->net->phydev);
1283
1284	return 0;
1285}
1286
1287static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1288{
1289	u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1290	return crc << ((filter % 2) * 16);
1291}
1292
1293static int smsc95xx_link_ok(struct usbnet *dev)
1294{
1295	struct smsc95xx_priv *pdata = dev->driver_priv;
1296	int ret;
1297
1298	/* first, a dummy read, needed to latch some MII phys */
1299	ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1300	if (ret < 0)
1301		return ret;
1302
1303	ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1304	if (ret < 0)
1305		return ret;
1306
1307	return !!(ret & BMSR_LSTATUS);
1308}
1309
1310static int smsc95xx_enter_suspend0(struct usbnet *dev)
1311{
1312	struct smsc95xx_priv *pdata = dev->driver_priv;
1313	u32 val;
1314	int ret;
1315
1316	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1317	if (ret < 0)
1318		return ret;
1319
1320	val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1321	val |= PM_CTL_SUS_MODE_0;
1322
1323	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1324	if (ret < 0)
1325		return ret;
1326
1327	/* clear wol status */
1328	val &= ~PM_CTL_WUPS_;
1329	val |= PM_CTL_WUPS_WOL_;
1330
1331	/* enable energy detection */
1332	if (pdata->wolopts & WAKE_PHY)
1333		val |= PM_CTL_WUPS_ED_;
1334
1335	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1336	if (ret < 0)
1337		return ret;
1338
1339	/* read back PM_CTRL */
1340	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1341	if (ret < 0)
1342		return ret;
1343
1344	pdata->suspend_flags |= SUSPEND_SUSPEND0;
1345
1346	return 0;
1347}
1348
1349static int smsc95xx_enter_suspend1(struct usbnet *dev)
1350{
1351	struct smsc95xx_priv *pdata = dev->driver_priv;
1352	int ret, phy_id = pdata->phydev->mdio.addr;
1353	u32 val;
1354
1355	/* reconfigure link pulse detection timing for
1356	 * compatibility with non-standard link partners
1357	 */
1358	if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1359		smsc95xx_mdio_write(dev, phy_id, PHY_EDPD_CONFIG,
1360				    PHY_EDPD_CONFIG_DEFAULT);
1361
1362	/* enable energy detect power-down mode */
1363	ret = smsc95xx_mdio_read(dev, phy_id, PHY_MODE_CTRL_STS);
1364	if (ret < 0)
1365		return ret;
1366
1367	ret |= MODE_CTRL_STS_EDPWRDOWN_;
1368
1369	smsc95xx_mdio_write(dev, phy_id, PHY_MODE_CTRL_STS, ret);
1370
1371	/* enter SUSPEND1 mode */
1372	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1373	if (ret < 0)
1374		return ret;
1375
1376	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1377	val |= PM_CTL_SUS_MODE_1;
1378
1379	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1380	if (ret < 0)
1381		return ret;
1382
1383	/* clear wol status, enable energy detection */
1384	val &= ~PM_CTL_WUPS_;
1385	val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1386
1387	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1388	if (ret < 0)
1389		return ret;
1390
1391	pdata->suspend_flags |= SUSPEND_SUSPEND1;
1392
1393	return 0;
1394}
1395
1396static int smsc95xx_enter_suspend2(struct usbnet *dev)
1397{
1398	struct smsc95xx_priv *pdata = dev->driver_priv;
1399	u32 val;
1400	int ret;
1401
1402	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1403	if (ret < 0)
1404		return ret;
1405
1406	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1407	val |= PM_CTL_SUS_MODE_2;
1408
1409	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1410	if (ret < 0)
1411		return ret;
1412
1413	pdata->suspend_flags |= SUSPEND_SUSPEND2;
1414
1415	return 0;
1416}
1417
1418static int smsc95xx_enter_suspend3(struct usbnet *dev)
1419{
1420	struct smsc95xx_priv *pdata = dev->driver_priv;
1421	u32 val;
1422	int ret;
1423
1424	ret = smsc95xx_read_reg(dev, RX_FIFO_INF, &val);
1425	if (ret < 0)
1426		return ret;
1427
1428	if (val & RX_FIFO_INF_USED_) {
1429		netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1430		return -EBUSY;
1431	}
1432
1433	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1434	if (ret < 0)
1435		return ret;
1436
1437	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1438	val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1439
1440	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1441	if (ret < 0)
1442		return ret;
1443
1444	/* clear wol status */
1445	val &= ~PM_CTL_WUPS_;
1446	val |= PM_CTL_WUPS_WOL_;
1447
1448	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1449	if (ret < 0)
1450		return ret;
1451
1452	pdata->suspend_flags |= SUSPEND_SUSPEND3;
1453
1454	return 0;
1455}
1456
1457static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1458{
1459	struct smsc95xx_priv *pdata = dev->driver_priv;
1460
1461	if (!netif_running(dev->net)) {
1462		/* interface is ifconfig down so fully power down hw */
1463		netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1464		return smsc95xx_enter_suspend2(dev);
1465	}
1466
1467	if (!link_up) {
1468		/* link is down so enter EDPD mode, but only if device can
1469		 * reliably resume from it.  This check should be redundant
1470		 * as current FEATURE_REMOTE_WAKEUP parts also support
1471		 * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1472		if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1473			netdev_warn(dev->net, "EDPD not supported\n");
1474			return -EBUSY;
1475		}
1476
1477		netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1478		netdev_info(dev->net, "entering SUSPEND1 mode\n");
1479		return smsc95xx_enter_suspend1(dev);
1480	}
1481
1482	netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1483	return smsc95xx_enter_suspend3(dev);
1484}
1485
1486static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1487{
1488	struct usbnet *dev = usb_get_intfdata(intf);
1489	struct smsc95xx_priv *pdata = dev->driver_priv;
1490	u32 val, link_up;
1491	int ret;
1492
1493	pdata->pm_task = current;
1494
1495	ret = usbnet_suspend(intf, message);
1496	if (ret < 0) {
1497		netdev_warn(dev->net, "usbnet_suspend error\n");
1498		pdata->pm_task = NULL;
1499		return ret;
1500	}
1501
1502	if (pdata->suspend_flags) {
1503		netdev_warn(dev->net, "error during last resume\n");
1504		pdata->suspend_flags = 0;
1505	}
1506
1507	link_up = smsc95xx_link_ok(dev);
1508
1509	if (message.event == PM_EVENT_AUTO_SUSPEND &&
1510	    (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1511		ret = smsc95xx_autosuspend(dev, link_up);
1512		goto done;
1513	}
1514
1515	/* if we get this far we're not autosuspending */
1516	/* if no wol options set, or if link is down and we're not waking on
1517	 * PHY activity, enter lowest power SUSPEND2 mode
1518	 */
1519	if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1520		!(link_up || (pdata->wolopts & WAKE_PHY))) {
1521		netdev_info(dev->net, "entering SUSPEND2 mode\n");
1522
1523		/* disable energy detect (link up) & wake up events */
1524		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1525		if (ret < 0)
1526			goto done;
1527
1528		val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1529
1530		ret = smsc95xx_write_reg(dev, WUCSR, val);
1531		if (ret < 0)
1532			goto done;
1533
1534		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1535		if (ret < 0)
1536			goto done;
1537
1538		val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1539
1540		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1541		if (ret < 0)
1542			goto done;
1543
1544		ret = smsc95xx_enter_suspend2(dev);
1545		goto done;
1546	}
1547
1548	if (pdata->wolopts & WAKE_PHY) {
1549		/* if link is down then configure EDPD and enter SUSPEND1,
1550		 * otherwise enter SUSPEND0 below
1551		 */
1552		if (!link_up) {
1553			netdev_info(dev->net, "entering SUSPEND1 mode\n");
1554			ret = smsc95xx_enter_suspend1(dev);
1555			goto done;
1556		}
1557	}
1558
1559	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1560		u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1561		u32 command[2];
1562		u32 offset[2];
1563		u32 crc[4];
1564		int wuff_filter_count =
1565			(pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1566			LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1567		int i, filter = 0;
1568
1569		if (!filter_mask) {
1570			netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1571			ret = -ENOMEM;
1572			goto done;
1573		}
1574
1575		memset(command, 0, sizeof(command));
1576		memset(offset, 0, sizeof(offset));
1577		memset(crc, 0, sizeof(crc));
1578
1579		if (pdata->wolopts & WAKE_BCAST) {
1580			const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1581			netdev_info(dev->net, "enabling broadcast detection\n");
1582			filter_mask[filter * 4] = 0x003F;
1583			filter_mask[filter * 4 + 1] = 0x00;
1584			filter_mask[filter * 4 + 2] = 0x00;
1585			filter_mask[filter * 4 + 3] = 0x00;
1586			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1587			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1588			crc[filter/2] |= smsc_crc(bcast, 6, filter);
1589			filter++;
1590		}
1591
1592		if (pdata->wolopts & WAKE_MCAST) {
1593			const u8 mcast[] = {0x01, 0x00, 0x5E};
1594			netdev_info(dev->net, "enabling multicast detection\n");
1595			filter_mask[filter * 4] = 0x0007;
1596			filter_mask[filter * 4 + 1] = 0x00;
1597			filter_mask[filter * 4 + 2] = 0x00;
1598			filter_mask[filter * 4 + 3] = 0x00;
1599			command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1600			offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1601			crc[filter/2] |= smsc_crc(mcast, 3, filter);
1602			filter++;
1603		}
1604
1605		if (pdata->wolopts & WAKE_ARP) {
1606			const u8 arp[] = {0x08, 0x06};
1607			netdev_info(dev->net, "enabling ARP detection\n");
1608			filter_mask[filter * 4] = 0x0003;
1609			filter_mask[filter * 4 + 1] = 0x00;
1610			filter_mask[filter * 4 + 2] = 0x00;
1611			filter_mask[filter * 4 + 3] = 0x00;
1612			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1613			offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1614			crc[filter/2] |= smsc_crc(arp, 2, filter);
1615			filter++;
1616		}
1617
1618		if (pdata->wolopts & WAKE_UCAST) {
1619			netdev_info(dev->net, "enabling unicast detection\n");
1620			filter_mask[filter * 4] = 0x003F;
1621			filter_mask[filter * 4 + 1] = 0x00;
1622			filter_mask[filter * 4 + 2] = 0x00;
1623			filter_mask[filter * 4 + 3] = 0x00;
1624			command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1625			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1626			crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1627			filter++;
1628		}
1629
1630		for (i = 0; i < (wuff_filter_count * 4); i++) {
1631			ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]);
1632			if (ret < 0) {
1633				kfree(filter_mask);
1634				goto done;
1635			}
1636		}
1637		kfree(filter_mask);
1638
1639		for (i = 0; i < (wuff_filter_count / 4); i++) {
1640			ret = smsc95xx_write_reg(dev, WUFF, command[i]);
1641			if (ret < 0)
1642				goto done;
1643		}
1644
1645		for (i = 0; i < (wuff_filter_count / 4); i++) {
1646			ret = smsc95xx_write_reg(dev, WUFF, offset[i]);
1647			if (ret < 0)
1648				goto done;
1649		}
1650
1651		for (i = 0; i < (wuff_filter_count / 2); i++) {
1652			ret = smsc95xx_write_reg(dev, WUFF, crc[i]);
1653			if (ret < 0)
1654				goto done;
1655		}
1656
1657		/* clear any pending pattern match packet status */
1658		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1659		if (ret < 0)
1660			goto done;
1661
1662		val |= WUCSR_WUFR_;
1663
1664		ret = smsc95xx_write_reg(dev, WUCSR, val);
1665		if (ret < 0)
1666			goto done;
1667	}
1668
1669	if (pdata->wolopts & WAKE_MAGIC) {
1670		/* clear any pending magic packet status */
1671		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1672		if (ret < 0)
1673			goto done;
1674
1675		val |= WUCSR_MPR_;
1676
1677		ret = smsc95xx_write_reg(dev, WUCSR, val);
1678		if (ret < 0)
1679			goto done;
1680	}
1681
1682	/* enable/disable wakeup sources */
1683	ret = smsc95xx_read_reg(dev, WUCSR, &val);
1684	if (ret < 0)
1685		goto done;
1686
1687	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1688		netdev_info(dev->net, "enabling pattern match wakeup\n");
1689		val |= WUCSR_WAKE_EN_;
1690	} else {
1691		netdev_info(dev->net, "disabling pattern match wakeup\n");
1692		val &= ~WUCSR_WAKE_EN_;
1693	}
1694
1695	if (pdata->wolopts & WAKE_MAGIC) {
1696		netdev_info(dev->net, "enabling magic packet wakeup\n");
1697		val |= WUCSR_MPEN_;
1698	} else {
1699		netdev_info(dev->net, "disabling magic packet wakeup\n");
1700		val &= ~WUCSR_MPEN_;
1701	}
1702
1703	ret = smsc95xx_write_reg(dev, WUCSR, val);
1704	if (ret < 0)
1705		goto done;
1706
1707	/* enable wol wakeup source */
1708	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1709	if (ret < 0)
1710		goto done;
1711
1712	val |= PM_CTL_WOL_EN_;
1713
1714	/* phy energy detect wakeup source */
1715	if (pdata->wolopts & WAKE_PHY)
1716		val |= PM_CTL_ED_EN_;
1717
1718	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1719	if (ret < 0)
1720		goto done;
1721
1722	/* enable receiver to enable frame reception */
1723	smsc95xx_start_rx_path(dev);
1724
1725	/* some wol options are enabled, so enter SUSPEND0 */
1726	netdev_info(dev->net, "entering SUSPEND0 mode\n");
1727	ret = smsc95xx_enter_suspend0(dev);
1728
1729done:
1730	/*
1731	 * TODO: resume() might need to handle the suspend failure
1732	 * in system sleep
1733	 */
1734	if (ret && PMSG_IS_AUTO(message))
1735		usbnet_resume(intf);
1736
1737	pdata->pm_task = NULL;
1738	return ret;
1739}
1740
1741static int smsc95xx_resume(struct usb_interface *intf)
1742{
1743	struct usbnet *dev = usb_get_intfdata(intf);
1744	struct smsc95xx_priv *pdata;
1745	u8 suspend_flags;
1746	int ret;
1747	u32 val;
1748
1749	BUG_ON(!dev);
1750	pdata = dev->driver_priv;
1751	suspend_flags = pdata->suspend_flags;
1752
1753	netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1754
1755	/* do this first to ensure it's cleared even in error case */
1756	pdata->suspend_flags = 0;
1757
1758	pdata->pm_task = current;
1759
1760	if (suspend_flags & SUSPEND_ALLMODES) {
1761		/* clear wake-up sources */
1762		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1763		if (ret < 0)
1764			goto done;
1765
1766		val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1767
1768		ret = smsc95xx_write_reg(dev, WUCSR, val);
1769		if (ret < 0)
1770			goto done;
1771
1772		/* clear wake-up status */
1773		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1774		if (ret < 0)
1775			goto done;
1776
1777		val &= ~PM_CTL_WOL_EN_;
1778		val |= PM_CTL_WUPS_;
1779
1780		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1781		if (ret < 0)
1782			goto done;
1783	}
1784
1785	phy_init_hw(pdata->phydev);
1786
1787	ret = usbnet_resume(intf);
1788	if (ret < 0)
1789		netdev_warn(dev->net, "usbnet_resume error\n");
1790
1791done:
1792	pdata->pm_task = NULL;
1793	return ret;
1794}
1795
1796static int smsc95xx_reset_resume(struct usb_interface *intf)
1797{
1798	struct usbnet *dev = usb_get_intfdata(intf);
1799	struct smsc95xx_priv *pdata = dev->driver_priv;
1800	int ret;
1801
1802	pdata->pm_task = current;
1803	ret = smsc95xx_reset(dev);
1804	pdata->pm_task = NULL;
1805	if (ret < 0)
1806		return ret;
1807
1808	return smsc95xx_resume(intf);
1809}
1810
1811static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1812{
1813	skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1814	skb->ip_summed = CHECKSUM_COMPLETE;
1815	skb_trim(skb, skb->len - 2);
1816}
1817
1818static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1819{
1820	/* This check is no longer done by usbnet */
1821	if (skb->len < dev->net->hard_header_len)
1822		return 0;
1823
1824	while (skb->len > 0) {
1825		u32 header, align_count;
1826		struct sk_buff *ax_skb;
1827		unsigned char *packet;
1828		u16 size;
1829
1830		header = get_unaligned_le32(skb->data);
1831		skb_pull(skb, 4 + NET_IP_ALIGN);
1832		packet = skb->data;
1833
1834		/* get the packet length */
1835		size = (u16)((header & RX_STS_FL_) >> 16);
1836		align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1837
1838		if (unlikely(size > skb->len)) {
1839			netif_dbg(dev, rx_err, dev->net,
1840				  "size err header=0x%08x\n", header);
1841			return 0;
1842		}
1843
1844		if (unlikely(header & RX_STS_ES_)) {
1845			netif_dbg(dev, rx_err, dev->net,
1846				  "Error header=0x%08x\n", header);
1847			dev->net->stats.rx_errors++;
1848			dev->net->stats.rx_dropped++;
1849
1850			if (header & RX_STS_CRC_) {
1851				dev->net->stats.rx_crc_errors++;
1852			} else {
1853				if (header & (RX_STS_TL_ | RX_STS_RF_))
1854					dev->net->stats.rx_frame_errors++;
1855
1856				if ((header & RX_STS_LE_) &&
1857					(!(header & RX_STS_FT_)))
1858					dev->net->stats.rx_length_errors++;
1859			}
1860		} else {
1861			/* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1862			if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1863				netif_dbg(dev, rx_err, dev->net,
1864					  "size err header=0x%08x\n", header);
1865				return 0;
1866			}
1867
1868			/* last frame in this batch */
1869			if (skb->len == size) {
1870				if (dev->net->features & NETIF_F_RXCSUM)
1871					smsc95xx_rx_csum_offload(skb);
1872				skb_trim(skb, skb->len - 4); /* remove fcs */
1873				skb->truesize = size + sizeof(struct sk_buff);
1874
1875				return 1;
1876			}
1877
1878			ax_skb = skb_clone(skb, GFP_ATOMIC);
1879			if (unlikely(!ax_skb)) {
1880				netdev_warn(dev->net, "Error allocating skb\n");
1881				return 0;
1882			}
1883
1884			ax_skb->len = size;
1885			ax_skb->data = packet;
1886			skb_set_tail_pointer(ax_skb, size);
1887
1888			if (dev->net->features & NETIF_F_RXCSUM)
1889				smsc95xx_rx_csum_offload(ax_skb);
1890			skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1891			ax_skb->truesize = size + sizeof(struct sk_buff);
1892
1893			usbnet_skb_return(dev, ax_skb);
1894		}
1895
1896		skb_pull(skb, size);
1897
1898		/* padding bytes before the next frame starts */
1899		if (skb->len)
1900			skb_pull(skb, align_count);
1901	}
1902
1903	return 1;
1904}
1905
1906static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1907{
1908	u16 low_16 = (u16)skb_checksum_start_offset(skb);
1909	u16 high_16 = low_16 + skb->csum_offset;
1910	return (high_16 << 16) | low_16;
1911}
1912
1913/* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1914 * transmission. This is fairly unlikely, only seems to trigger with some
1915 * short TCP ACK packets sent.
1916 *
1917 * Note, this calculation should probably check for the alignment of the
1918 * data as well, but a straight check for csum being in the last four bytes
1919 * of the packet should be ok for now.
1920 */
1921static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1922{
1923       unsigned int len = skb->len - skb_checksum_start_offset(skb);
1924
1925       if (skb->len <= 45)
1926	       return false;
1927       return skb->csum_offset < (len - (4 + 1));
1928}
1929
1930static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1931					 struct sk_buff *skb, gfp_t flags)
1932{
1933	bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1934	int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1935	u32 tx_cmd_a, tx_cmd_b;
1936	void *ptr;
1937
1938	/* We do not advertise SG, so skbs should be already linearized */
1939	BUG_ON(skb_shinfo(skb)->nr_frags);
1940
1941	/* Make writable and expand header space by overhead if required */
1942	if (skb_cow_head(skb, overhead)) {
1943		/* Must deallocate here as returning NULL to indicate error
1944		 * means the skb won't be deallocated in the caller.
1945		 */
1946		dev_kfree_skb_any(skb);
1947		return NULL;
1948	}
1949
1950	tx_cmd_b = (u32)skb->len;
1951	tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1952
1953	if (csum) {
1954		if (!smsc95xx_can_tx_checksum(skb)) {
1955			/* workaround - hardware tx checksum does not work
1956			 * properly with extremely small packets */
1957			long csstart = skb_checksum_start_offset(skb);
1958			__wsum calc = csum_partial(skb->data + csstart,
1959				skb->len - csstart, 0);
1960			*((__sum16 *)(skb->data + csstart
1961				+ skb->csum_offset)) = csum_fold(calc);
1962
1963			csum = false;
1964		} else {
1965			u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1966			ptr = skb_push(skb, 4);
1967			put_unaligned_le32(csum_preamble, ptr);
1968
1969			tx_cmd_a += 4;
1970			tx_cmd_b += 4;
1971			tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1972		}
1973	}
1974
1975	ptr = skb_push(skb, 8);
1976	put_unaligned_le32(tx_cmd_a, ptr);
1977	put_unaligned_le32(tx_cmd_b, ptr+4);
1978
1979	return skb;
1980}
1981
1982static int smsc95xx_manage_power(struct usbnet *dev, int on)
1983{
1984	struct smsc95xx_priv *pdata = dev->driver_priv;
1985
1986	dev->intf->needs_remote_wakeup = on;
1987
1988	if (pdata->features & FEATURE_REMOTE_WAKEUP)
1989		return 0;
1990
1991	/* this chip revision isn't capable of remote wakeup */
1992	netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1993
1994	if (on)
1995		usb_autopm_get_interface_no_resume(dev->intf);
1996	else
1997		usb_autopm_put_interface(dev->intf);
1998
1999	return 0;
2000}
2001
2002static const struct driver_info smsc95xx_info = {
2003	.description	= "smsc95xx USB 2.0 Ethernet",
2004	.bind		= smsc95xx_bind,
2005	.unbind		= smsc95xx_unbind,
2006	.reset		= smsc95xx_reset,
2007	.check_connect	= smsc95xx_start_phy,
2008	.stop		= smsc95xx_stop,
2009	.rx_fixup	= smsc95xx_rx_fixup,
2010	.tx_fixup	= smsc95xx_tx_fixup,
2011	.status		= smsc95xx_status,
2012	.manage_power	= smsc95xx_manage_power,
2013	.flags		= FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2014};
2015
2016static const struct usb_device_id products[] = {
2017	{
2018		/* SMSC9500 USB Ethernet Device */
2019		USB_DEVICE(0x0424, 0x9500),
2020		.driver_info = (unsigned long) &smsc95xx_info,
2021	},
2022	{
2023		/* SMSC9505 USB Ethernet Device */
2024		USB_DEVICE(0x0424, 0x9505),
2025		.driver_info = (unsigned long) &smsc95xx_info,
2026	},
2027	{
2028		/* SMSC9500A USB Ethernet Device */
2029		USB_DEVICE(0x0424, 0x9E00),
2030		.driver_info = (unsigned long) &smsc95xx_info,
2031	},
2032	{
2033		/* SMSC9505A USB Ethernet Device */
2034		USB_DEVICE(0x0424, 0x9E01),
2035		.driver_info = (unsigned long) &smsc95xx_info,
2036	},
2037	{
2038		/* SMSC9512/9514 USB Hub & Ethernet Device */
2039		USB_DEVICE(0x0424, 0xec00),
2040		.driver_info = (unsigned long) &smsc95xx_info,
2041	},
2042	{
2043		/* SMSC9500 USB Ethernet Device (SAL10) */
2044		USB_DEVICE(0x0424, 0x9900),
2045		.driver_info = (unsigned long) &smsc95xx_info,
2046	},
2047	{
2048		/* SMSC9505 USB Ethernet Device (SAL10) */
2049		USB_DEVICE(0x0424, 0x9901),
2050		.driver_info = (unsigned long) &smsc95xx_info,
2051	},
2052	{
2053		/* SMSC9500A USB Ethernet Device (SAL10) */
2054		USB_DEVICE(0x0424, 0x9902),
2055		.driver_info = (unsigned long) &smsc95xx_info,
2056	},
2057	{
2058		/* SMSC9505A USB Ethernet Device (SAL10) */
2059		USB_DEVICE(0x0424, 0x9903),
2060		.driver_info = (unsigned long) &smsc95xx_info,
2061	},
2062	{
2063		/* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2064		USB_DEVICE(0x0424, 0x9904),
2065		.driver_info = (unsigned long) &smsc95xx_info,
2066	},
2067	{
2068		/* SMSC9500A USB Ethernet Device (HAL) */
2069		USB_DEVICE(0x0424, 0x9905),
2070		.driver_info = (unsigned long) &smsc95xx_info,
2071	},
2072	{
2073		/* SMSC9505A USB Ethernet Device (HAL) */
2074		USB_DEVICE(0x0424, 0x9906),
2075		.driver_info = (unsigned long) &smsc95xx_info,
2076	},
2077	{
2078		/* SMSC9500 USB Ethernet Device (Alternate ID) */
2079		USB_DEVICE(0x0424, 0x9907),
2080		.driver_info = (unsigned long) &smsc95xx_info,
2081	},
2082	{
2083		/* SMSC9500A USB Ethernet Device (Alternate ID) */
2084		USB_DEVICE(0x0424, 0x9908),
2085		.driver_info = (unsigned long) &smsc95xx_info,
2086	},
2087	{
2088		/* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2089		USB_DEVICE(0x0424, 0x9909),
2090		.driver_info = (unsigned long) &smsc95xx_info,
2091	},
2092	{
2093		/* SMSC LAN9530 USB Ethernet Device */
2094		USB_DEVICE(0x0424, 0x9530),
2095		.driver_info = (unsigned long) &smsc95xx_info,
2096	},
2097	{
2098		/* SMSC LAN9730 USB Ethernet Device */
2099		USB_DEVICE(0x0424, 0x9730),
2100		.driver_info = (unsigned long) &smsc95xx_info,
2101	},
2102	{
2103		/* SMSC LAN89530 USB Ethernet Device */
2104		USB_DEVICE(0x0424, 0x9E08),
2105		.driver_info = (unsigned long) &smsc95xx_info,
2106	},
2107	{
2108		/* SYSTEC USB-SPEmodule1 10BASE-T1L Ethernet Device */
2109		USB_DEVICE(0x0878, 0x1400),
2110		.driver_info = (unsigned long)&smsc95xx_info,
2111	},
2112	{
2113		/* Microchip's EVB-LAN8670-USB 10BASE-T1S Ethernet Device */
2114		USB_DEVICE(0x184F, 0x0051),
2115		.driver_info = (unsigned long)&smsc95xx_info,
2116	},
2117	{ },		/* END */
2118};
2119MODULE_DEVICE_TABLE(usb, products);
2120
2121static struct usb_driver smsc95xx_driver = {
2122	.name		= "smsc95xx",
2123	.id_table	= products,
2124	.probe		= usbnet_probe,
2125	.suspend	= smsc95xx_suspend,
2126	.resume		= smsc95xx_resume,
2127	.reset_resume	= smsc95xx_reset_resume,
2128	.disconnect	= usbnet_disconnect,
2129	.disable_hub_initiated_lpm = 1,
2130	.supports_autosuspend = 1,
2131};
2132
2133module_usb_driver(smsc95xx_driver);
2134
2135MODULE_AUTHOR("Nancy Lin");
2136MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2137MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2138MODULE_LICENSE("GPL");