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, 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	ret = smsc95xx_read_reg(dev, LED_GPIO_CFG, &read_buf);
1007	if (ret < 0)
1008		return ret;
1009	/* Configure GPIO pins as LED outputs */
1010	read_buf |= LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1011		    LED_GPIO_CFG_FDX_LED;
1012	ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, read_buf);
1013	if (ret < 0)
1014		return ret;
1015
1016	/* Init Tx */
1017	ret = smsc95xx_write_reg(dev, FLOW, 0);
1018	if (ret < 0)
1019		return ret;
1020
1021	ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1022	if (ret < 0)
1023		return ret;
1024
1025	/* Don't need mac_cr_lock during initialisation */
1026	ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1027	if (ret < 0)
1028		return ret;
1029
1030	/* Init Rx */
1031	/* Set Vlan */
1032	ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1033	if (ret < 0)
1034		return ret;
1035
1036	/* Enable or disable checksum offload engines */
1037	ret = smsc95xx_set_features(dev->net, dev->net->features);
1038	if (ret < 0) {
1039		netdev_warn(dev->net, "Failed to set checksum offload features\n");
1040		return ret;
1041	}
1042
1043	smsc95xx_set_multicast(dev->net);
1044
1045	ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1046	if (ret < 0)
1047		return ret;
1048
1049	/* enable PHY interrupts */
1050	read_buf |= INT_EP_CTL_PHY_INT_;
1051
1052	ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1053	if (ret < 0)
1054		return ret;
1055
1056	ret = smsc95xx_start_tx_path(dev);
1057	if (ret < 0) {
1058		netdev_warn(dev->net, "Failed to start TX path\n");
1059		return ret;
1060	}
1061
1062	ret = smsc95xx_start_rx_path(dev);
1063	if (ret < 0) {
1064		netdev_warn(dev->net, "Failed to start RX path\n");
1065		return ret;
1066	}
1067
1068	netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1069	return 0;
1070}
1071
1072static const struct net_device_ops smsc95xx_netdev_ops = {
1073	.ndo_open		= usbnet_open,
1074	.ndo_stop		= usbnet_stop,
1075	.ndo_start_xmit		= usbnet_start_xmit,
1076	.ndo_tx_timeout		= usbnet_tx_timeout,
1077	.ndo_change_mtu		= usbnet_change_mtu,
1078	.ndo_get_stats64	= dev_get_tstats64,
1079	.ndo_set_mac_address 	= eth_mac_addr,
1080	.ndo_validate_addr	= eth_validate_addr,
1081	.ndo_eth_ioctl		= smsc95xx_ioctl,
1082	.ndo_set_rx_mode	= smsc95xx_set_multicast,
1083	.ndo_set_features	= smsc95xx_set_features,
1084};
1085
1086static void smsc95xx_handle_link_change(struct net_device *net)
1087{
1088	struct usbnet *dev = netdev_priv(net);
1089
1090	phy_print_status(net->phydev);
1091	smsc95xx_mac_update_fullduplex(dev);
1092	usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1093}
1094
1095static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1096{
1097	struct smsc95xx_priv *pdata;
1098	char usb_path[64];
1099	int ret, phy_irq;
1100	u32 val;
1101
1102	printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1103
1104	ret = usbnet_get_endpoints(dev, intf);
1105	if (ret < 0) {
1106		netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1107		return ret;
1108	}
1109
1110	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1111	if (!pdata)
1112		return -ENOMEM;
1113
1114	dev->driver_priv = pdata;
1115
1116	spin_lock_init(&pdata->mac_cr_lock);
1117
1118	/* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1119	 * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1120	 * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1121	 * it is transmitted as all ones. The zero transmitted checksum means
1122	 * transmitter generated no checksum. Hence, enable csum offload only
1123	 * for ipv4 packets.
1124	 */
1125	if (DEFAULT_TX_CSUM_ENABLE)
1126		dev->net->features |= NETIF_F_IP_CSUM;
1127	if (DEFAULT_RX_CSUM_ENABLE)
1128		dev->net->features |= NETIF_F_RXCSUM;
1129
1130	dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1131	set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1132
1133	smsc95xx_init_mac_address(dev);
1134
1135	/* Init all registers */
1136	ret = smsc95xx_reset(dev);
1137	if (ret)
1138		goto free_pdata;
1139
1140	/* create irq domain for use by PHY driver and GPIO consumers */
1141	usb_make_path(dev->udev, usb_path, sizeof(usb_path));
1142	pdata->irqfwnode = irq_domain_alloc_named_fwnode(usb_path);
1143	if (!pdata->irqfwnode) {
1144		ret = -ENOMEM;
1145		goto free_pdata;
1146	}
1147
1148	pdata->irqdomain = irq_domain_create_linear(pdata->irqfwnode,
1149						    SMSC95XX_NR_IRQS,
1150						    &irq_domain_simple_ops,
1151						    pdata);
1152	if (!pdata->irqdomain) {
1153		ret = -ENOMEM;
1154		goto free_irqfwnode;
1155	}
1156
1157	phy_irq = irq_create_mapping(pdata->irqdomain, PHY_HWIRQ);
1158	if (!phy_irq) {
1159		ret = -ENOENT;
1160		goto remove_irqdomain;
1161	}
1162
1163	pdata->irqchip = dummy_irq_chip;
1164	pdata->irqchip.name = SMSC_CHIPNAME;
1165	irq_set_chip_and_handler_name(phy_irq, &pdata->irqchip,
1166				      handle_simple_irq, "phy");
1167
1168	pdata->mdiobus = mdiobus_alloc();
1169	if (!pdata->mdiobus) {
1170		ret = -ENOMEM;
1171		goto dispose_irq;
1172	}
1173
1174	ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1175	if (ret < 0)
1176		goto free_mdio;
1177
1178	pdata->is_internal_phy = !(val & HW_CFG_PSEL_);
1179	if (pdata->is_internal_phy)
1180		pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1181
1182	pdata->mdiobus->priv = dev;
1183	pdata->mdiobus->read = smsc95xx_mdiobus_read;
1184	pdata->mdiobus->write = smsc95xx_mdiobus_write;
1185	pdata->mdiobus->reset = smsc95xx_mdiobus_reset;
1186	pdata->mdiobus->name = "smsc95xx-mdiobus";
1187	pdata->mdiobus->parent = &dev->udev->dev;
1188
1189	snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1190		 "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1191
1192	ret = mdiobus_register(pdata->mdiobus);
1193	if (ret) {
1194		netdev_err(dev->net, "Could not register MDIO bus\n");
1195		goto free_mdio;
1196	}
1197
1198	pdata->phydev = phy_find_first(pdata->mdiobus);
1199	if (!pdata->phydev) {
1200		netdev_err(dev->net, "no PHY found\n");
1201		ret = -ENODEV;
1202		goto unregister_mdio;
1203	}
1204
1205	pdata->phydev->irq = phy_irq;
1206	pdata->phydev->is_internal = pdata->is_internal_phy;
1207
1208	/* detect device revision as different features may be available */
1209	ret = smsc95xx_read_reg(dev, ID_REV, &val);
1210	if (ret < 0)
1211		goto unregister_mdio;
1212
1213	val >>= 16;
1214	if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1215	    (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1216		pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1217			FEATURE_PHY_NLP_CROSSOVER |
1218			FEATURE_REMOTE_WAKEUP);
1219	else if (val == ID_REV_CHIP_ID_9512_)
1220		pdata->features = FEATURE_8_WAKEUP_FILTERS;
1221
1222	dev->net->netdev_ops = &smsc95xx_netdev_ops;
1223	dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1224	dev->net->flags |= IFF_MULTICAST;
1225	dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1226	dev->net->min_mtu = ETH_MIN_MTU;
1227	dev->net->max_mtu = ETH_DATA_LEN;
1228	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1229
1230	ret = phy_connect_direct(dev->net, pdata->phydev,
1231				 &smsc95xx_handle_link_change,
1232				 PHY_INTERFACE_MODE_MII);
1233	if (ret) {
1234		netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1235		goto unregister_mdio;
1236	}
1237
1238	phy_attached_info(dev->net->phydev);
1239
1240	return 0;
1241
1242unregister_mdio:
1243	mdiobus_unregister(pdata->mdiobus);
1244
1245free_mdio:
1246	mdiobus_free(pdata->mdiobus);
1247
1248dispose_irq:
1249	irq_dispose_mapping(phy_irq);
1250
1251remove_irqdomain:
1252	irq_domain_remove(pdata->irqdomain);
1253
1254free_irqfwnode:
1255	irq_domain_free_fwnode(pdata->irqfwnode);
1256
1257free_pdata:
1258	kfree(pdata);
1259	return ret;
1260}
1261
1262static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1263{
1264	struct smsc95xx_priv *pdata = dev->driver_priv;
1265
1266	phy_disconnect(dev->net->phydev);
1267	mdiobus_unregister(pdata->mdiobus);
1268	mdiobus_free(pdata->mdiobus);
1269	irq_dispose_mapping(irq_find_mapping(pdata->irqdomain, PHY_HWIRQ));
1270	irq_domain_remove(pdata->irqdomain);
1271	irq_domain_free_fwnode(pdata->irqfwnode);
1272	netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1273	kfree(pdata);
1274}
1275
1276static int smsc95xx_start_phy(struct usbnet *dev)
1277{
1278	phy_start(dev->net->phydev);
1279
1280	return 0;
1281}
1282
1283static int smsc95xx_stop(struct usbnet *dev)
1284{
1285	phy_stop(dev->net->phydev);
1286
1287	return 0;
1288}
1289
1290static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1291{
1292	u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1293	return crc << ((filter % 2) * 16);
1294}
1295
1296static int smsc95xx_link_ok(struct usbnet *dev)
1297{
1298	struct smsc95xx_priv *pdata = dev->driver_priv;
1299	int ret;
1300
1301	/* first, a dummy read, needed to latch some MII phys */
1302	ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1303	if (ret < 0)
1304		return ret;
1305
1306	ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1307	if (ret < 0)
1308		return ret;
1309
1310	return !!(ret & BMSR_LSTATUS);
1311}
1312
1313static int smsc95xx_enter_suspend0(struct usbnet *dev)
1314{
1315	struct smsc95xx_priv *pdata = dev->driver_priv;
1316	u32 val;
1317	int ret;
1318
1319	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1320	if (ret < 0)
1321		return ret;
1322
1323	val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1324	val |= PM_CTL_SUS_MODE_0;
1325
1326	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1327	if (ret < 0)
1328		return ret;
1329
1330	/* clear wol status */
1331	val &= ~PM_CTL_WUPS_;
1332	val |= PM_CTL_WUPS_WOL_;
1333
1334	/* enable energy detection */
1335	if (pdata->wolopts & WAKE_PHY)
1336		val |= PM_CTL_WUPS_ED_;
1337
1338	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1339	if (ret < 0)
1340		return ret;
1341
1342	/* read back PM_CTRL */
1343	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1344	if (ret < 0)
1345		return ret;
1346
1347	pdata->suspend_flags |= SUSPEND_SUSPEND0;
1348
1349	return 0;
1350}
1351
1352static int smsc95xx_enter_suspend1(struct usbnet *dev)
1353{
1354	struct smsc95xx_priv *pdata = dev->driver_priv;
1355	int ret, phy_id = pdata->phydev->mdio.addr;
1356	u32 val;
1357
1358	/* reconfigure link pulse detection timing for
1359	 * compatibility with non-standard link partners
1360	 */
1361	if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1362		smsc95xx_mdio_write(dev, phy_id, PHY_EDPD_CONFIG,
1363				    PHY_EDPD_CONFIG_DEFAULT);
1364
1365	/* enable energy detect power-down mode */
1366	ret = smsc95xx_mdio_read(dev, phy_id, PHY_MODE_CTRL_STS);
1367	if (ret < 0)
1368		return ret;
1369
1370	ret |= MODE_CTRL_STS_EDPWRDOWN_;
1371
1372	smsc95xx_mdio_write(dev, phy_id, PHY_MODE_CTRL_STS, ret);
1373
1374	/* enter SUSPEND1 mode */
1375	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1376	if (ret < 0)
1377		return ret;
1378
1379	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1380	val |= PM_CTL_SUS_MODE_1;
1381
1382	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1383	if (ret < 0)
1384		return ret;
1385
1386	/* clear wol status, enable energy detection */
1387	val &= ~PM_CTL_WUPS_;
1388	val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1389
1390	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1391	if (ret < 0)
1392		return ret;
1393
1394	pdata->suspend_flags |= SUSPEND_SUSPEND1;
1395
1396	return 0;
1397}
1398
1399static int smsc95xx_enter_suspend2(struct usbnet *dev)
1400{
1401	struct smsc95xx_priv *pdata = dev->driver_priv;
1402	u32 val;
1403	int ret;
1404
1405	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1406	if (ret < 0)
1407		return ret;
1408
1409	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1410	val |= PM_CTL_SUS_MODE_2;
1411
1412	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1413	if (ret < 0)
1414		return ret;
1415
1416	pdata->suspend_flags |= SUSPEND_SUSPEND2;
1417
1418	return 0;
1419}
1420
1421static int smsc95xx_enter_suspend3(struct usbnet *dev)
1422{
1423	struct smsc95xx_priv *pdata = dev->driver_priv;
1424	u32 val;
1425	int ret;
1426
1427	ret = smsc95xx_read_reg(dev, RX_FIFO_INF, &val);
1428	if (ret < 0)
1429		return ret;
1430
1431	if (val & RX_FIFO_INF_USED_) {
1432		netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1433		return -EBUSY;
1434	}
1435
1436	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1437	if (ret < 0)
1438		return ret;
1439
1440	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1441	val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1442
1443	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1444	if (ret < 0)
1445		return ret;
1446
1447	/* clear wol status */
1448	val &= ~PM_CTL_WUPS_;
1449	val |= PM_CTL_WUPS_WOL_;
1450
1451	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1452	if (ret < 0)
1453		return ret;
1454
1455	pdata->suspend_flags |= SUSPEND_SUSPEND3;
1456
1457	return 0;
1458}
1459
1460static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1461{
1462	struct smsc95xx_priv *pdata = dev->driver_priv;
1463
1464	if (!netif_running(dev->net)) {
1465		/* interface is ifconfig down so fully power down hw */
1466		netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1467		return smsc95xx_enter_suspend2(dev);
1468	}
1469
1470	if (!link_up) {
1471		/* link is down so enter EDPD mode, but only if device can
1472		 * reliably resume from it.  This check should be redundant
1473		 * as current FEATURE_REMOTE_WAKEUP parts also support
1474		 * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1475		if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1476			netdev_warn(dev->net, "EDPD not supported\n");
1477			return -EBUSY;
1478		}
1479
1480		netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1481		netdev_info(dev->net, "entering SUSPEND1 mode\n");
1482		return smsc95xx_enter_suspend1(dev);
1483	}
1484
1485	netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1486	return smsc95xx_enter_suspend3(dev);
1487}
1488
1489static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1490{
1491	struct usbnet *dev = usb_get_intfdata(intf);
1492	struct smsc95xx_priv *pdata = dev->driver_priv;
1493	u32 val, link_up;
1494	int ret;
1495
1496	pdata->pm_task = current;
1497
1498	ret = usbnet_suspend(intf, message);
1499	if (ret < 0) {
1500		netdev_warn(dev->net, "usbnet_suspend error\n");
1501		pdata->pm_task = NULL;
1502		return ret;
1503	}
1504
1505	if (pdata->suspend_flags) {
1506		netdev_warn(dev->net, "error during last resume\n");
1507		pdata->suspend_flags = 0;
1508	}
1509
1510	link_up = smsc95xx_link_ok(dev);
1511
1512	if (message.event == PM_EVENT_AUTO_SUSPEND &&
1513	    (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1514		ret = smsc95xx_autosuspend(dev, link_up);
1515		goto done;
1516	}
1517
1518	/* if we get this far we're not autosuspending */
1519	/* if no wol options set, or if link is down and we're not waking on
1520	 * PHY activity, enter lowest power SUSPEND2 mode
1521	 */
1522	if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1523		!(link_up || (pdata->wolopts & WAKE_PHY))) {
1524		netdev_info(dev->net, "entering SUSPEND2 mode\n");
1525
1526		/* disable energy detect (link up) & wake up events */
1527		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1528		if (ret < 0)
1529			goto done;
1530
1531		val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1532
1533		ret = smsc95xx_write_reg(dev, WUCSR, val);
1534		if (ret < 0)
1535			goto done;
1536
1537		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1538		if (ret < 0)
1539			goto done;
1540
1541		val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1542
1543		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1544		if (ret < 0)
1545			goto done;
1546
1547		ret = smsc95xx_enter_suspend2(dev);
1548		goto done;
1549	}
1550
1551	if (pdata->wolopts & WAKE_PHY) {
1552		/* if link is down then configure EDPD and enter SUSPEND1,
1553		 * otherwise enter SUSPEND0 below
1554		 */
1555		if (!link_up) {
1556			netdev_info(dev->net, "entering SUSPEND1 mode\n");
1557			ret = smsc95xx_enter_suspend1(dev);
1558			goto done;
1559		}
1560	}
1561
1562	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1563		u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1564		u32 command[2];
1565		u32 offset[2];
1566		u32 crc[4];
1567		int wuff_filter_count =
1568			(pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1569			LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1570		int i, filter = 0;
1571
1572		if (!filter_mask) {
1573			netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1574			ret = -ENOMEM;
1575			goto done;
1576		}
1577
1578		memset(command, 0, sizeof(command));
1579		memset(offset, 0, sizeof(offset));
1580		memset(crc, 0, sizeof(crc));
1581
1582		if (pdata->wolopts & WAKE_BCAST) {
1583			const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1584			netdev_info(dev->net, "enabling broadcast detection\n");
1585			filter_mask[filter * 4] = 0x003F;
1586			filter_mask[filter * 4 + 1] = 0x00;
1587			filter_mask[filter * 4 + 2] = 0x00;
1588			filter_mask[filter * 4 + 3] = 0x00;
1589			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1590			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1591			crc[filter/2] |= smsc_crc(bcast, 6, filter);
1592			filter++;
1593		}
1594
1595		if (pdata->wolopts & WAKE_MCAST) {
1596			const u8 mcast[] = {0x01, 0x00, 0x5E};
1597			netdev_info(dev->net, "enabling multicast detection\n");
1598			filter_mask[filter * 4] = 0x0007;
1599			filter_mask[filter * 4 + 1] = 0x00;
1600			filter_mask[filter * 4 + 2] = 0x00;
1601			filter_mask[filter * 4 + 3] = 0x00;
1602			command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1603			offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1604			crc[filter/2] |= smsc_crc(mcast, 3, filter);
1605			filter++;
1606		}
1607
1608		if (pdata->wolopts & WAKE_ARP) {
1609			const u8 arp[] = {0x08, 0x06};
1610			netdev_info(dev->net, "enabling ARP detection\n");
1611			filter_mask[filter * 4] = 0x0003;
1612			filter_mask[filter * 4 + 1] = 0x00;
1613			filter_mask[filter * 4 + 2] = 0x00;
1614			filter_mask[filter * 4 + 3] = 0x00;
1615			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1616			offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1617			crc[filter/2] |= smsc_crc(arp, 2, filter);
1618			filter++;
1619		}
1620
1621		if (pdata->wolopts & WAKE_UCAST) {
1622			netdev_info(dev->net, "enabling unicast detection\n");
1623			filter_mask[filter * 4] = 0x003F;
1624			filter_mask[filter * 4 + 1] = 0x00;
1625			filter_mask[filter * 4 + 2] = 0x00;
1626			filter_mask[filter * 4 + 3] = 0x00;
1627			command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1628			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1629			crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1630			filter++;
1631		}
1632
1633		for (i = 0; i < (wuff_filter_count * 4); i++) {
1634			ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]);
1635			if (ret < 0) {
1636				kfree(filter_mask);
1637				goto done;
1638			}
1639		}
1640		kfree(filter_mask);
1641
1642		for (i = 0; i < (wuff_filter_count / 4); i++) {
1643			ret = smsc95xx_write_reg(dev, WUFF, command[i]);
1644			if (ret < 0)
1645				goto done;
1646		}
1647
1648		for (i = 0; i < (wuff_filter_count / 4); i++) {
1649			ret = smsc95xx_write_reg(dev, WUFF, offset[i]);
1650			if (ret < 0)
1651				goto done;
1652		}
1653
1654		for (i = 0; i < (wuff_filter_count / 2); i++) {
1655			ret = smsc95xx_write_reg(dev, WUFF, crc[i]);
1656			if (ret < 0)
1657				goto done;
1658		}
1659
1660		/* clear any pending pattern match packet status */
1661		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1662		if (ret < 0)
1663			goto done;
1664
1665		val |= WUCSR_WUFR_;
1666
1667		ret = smsc95xx_write_reg(dev, WUCSR, val);
1668		if (ret < 0)
1669			goto done;
1670	}
1671
1672	if (pdata->wolopts & WAKE_MAGIC) {
1673		/* clear any pending magic packet status */
1674		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1675		if (ret < 0)
1676			goto done;
1677
1678		val |= WUCSR_MPR_;
1679
1680		ret = smsc95xx_write_reg(dev, WUCSR, val);
1681		if (ret < 0)
1682			goto done;
1683	}
1684
1685	/* enable/disable wakeup sources */
1686	ret = smsc95xx_read_reg(dev, WUCSR, &val);
1687	if (ret < 0)
1688		goto done;
1689
1690	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1691		netdev_info(dev->net, "enabling pattern match wakeup\n");
1692		val |= WUCSR_WAKE_EN_;
1693	} else {
1694		netdev_info(dev->net, "disabling pattern match wakeup\n");
1695		val &= ~WUCSR_WAKE_EN_;
1696	}
1697
1698	if (pdata->wolopts & WAKE_MAGIC) {
1699		netdev_info(dev->net, "enabling magic packet wakeup\n");
1700		val |= WUCSR_MPEN_;
1701	} else {
1702		netdev_info(dev->net, "disabling magic packet wakeup\n");
1703		val &= ~WUCSR_MPEN_;
1704	}
1705
1706	ret = smsc95xx_write_reg(dev, WUCSR, val);
1707	if (ret < 0)
1708		goto done;
1709
1710	/* enable wol wakeup source */
1711	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1712	if (ret < 0)
1713		goto done;
1714
1715	val |= PM_CTL_WOL_EN_;
1716
1717	/* phy energy detect wakeup source */
1718	if (pdata->wolopts & WAKE_PHY)
1719		val |= PM_CTL_ED_EN_;
1720
1721	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1722	if (ret < 0)
1723		goto done;
1724
1725	/* enable receiver to enable frame reception */
1726	smsc95xx_start_rx_path(dev);
1727
1728	/* some wol options are enabled, so enter SUSPEND0 */
1729	netdev_info(dev->net, "entering SUSPEND0 mode\n");
1730	ret = smsc95xx_enter_suspend0(dev);
1731
1732done:
1733	/*
1734	 * TODO: resume() might need to handle the suspend failure
1735	 * in system sleep
1736	 */
1737	if (ret && PMSG_IS_AUTO(message))
1738		usbnet_resume(intf);
1739
1740	pdata->pm_task = NULL;
1741	return ret;
1742}
1743
1744static int smsc95xx_resume(struct usb_interface *intf)
1745{
1746	struct usbnet *dev = usb_get_intfdata(intf);
1747	struct smsc95xx_priv *pdata;
1748	u8 suspend_flags;
1749	int ret;
1750	u32 val;
1751
1752	BUG_ON(!dev);
1753	pdata = dev->driver_priv;
1754	suspend_flags = pdata->suspend_flags;
1755
1756	netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1757
1758	/* do this first to ensure it's cleared even in error case */
1759	pdata->suspend_flags = 0;
1760
1761	pdata->pm_task = current;
1762
1763	if (suspend_flags & SUSPEND_ALLMODES) {
1764		/* clear wake-up sources */
1765		ret = smsc95xx_read_reg(dev, WUCSR, &val);
1766		if (ret < 0)
1767			goto done;
1768
1769		val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1770
1771		ret = smsc95xx_write_reg(dev, WUCSR, val);
1772		if (ret < 0)
1773			goto done;
1774
1775		/* clear wake-up status */
1776		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1777		if (ret < 0)
1778			goto done;
1779
1780		val &= ~PM_CTL_WOL_EN_;
1781		val |= PM_CTL_WUPS_;
1782
1783		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1784		if (ret < 0)
1785			goto done;
1786	}
1787
1788	phy_init_hw(pdata->phydev);
1789
1790	ret = usbnet_resume(intf);
1791	if (ret < 0)
1792		netdev_warn(dev->net, "usbnet_resume error\n");
1793
1794done:
1795	pdata->pm_task = NULL;
1796	return ret;
1797}
1798
1799static int smsc95xx_reset_resume(struct usb_interface *intf)
1800{
1801	struct usbnet *dev = usb_get_intfdata(intf);
1802	struct smsc95xx_priv *pdata = dev->driver_priv;
1803	int ret;
1804
1805	pdata->pm_task = current;
1806	ret = smsc95xx_reset(dev);
1807	pdata->pm_task = NULL;
1808	if (ret < 0)
1809		return ret;
1810
1811	return smsc95xx_resume(intf);
1812}
1813
1814static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1815{
1816	u16 *csum_ptr = (u16 *)(skb_tail_pointer(skb) - 2);
1817
1818	skb->csum = (__force __wsum)get_unaligned(csum_ptr);
1819	skb->ip_summed = CHECKSUM_COMPLETE;
1820	skb_trim(skb, skb->len - 2); /* remove csum */
1821}
1822
1823static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1824{
1825	/* This check is no longer done by usbnet */
1826	if (skb->len < dev->net->hard_header_len)
1827		return 0;
1828
1829	while (skb->len > 0) {
1830		u32 header, align_count;
1831		struct sk_buff *ax_skb;
1832		unsigned char *packet;
1833		u16 size;
1834
1835		header = get_unaligned_le32(skb->data);
1836		skb_pull(skb, 4 + NET_IP_ALIGN);
1837		packet = skb->data;
1838
1839		/* get the packet length */
1840		size = (u16)((header & RX_STS_FL_) >> 16);
1841		align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1842
1843		if (unlikely(size > skb->len)) {
1844			netif_dbg(dev, rx_err, dev->net,
1845				  "size err header=0x%08x\n", header);
1846			return 0;
1847		}
1848
1849		if (unlikely(header & RX_STS_ES_)) {
1850			netif_dbg(dev, rx_err, dev->net,
1851				  "Error header=0x%08x\n", header);
1852			dev->net->stats.rx_errors++;
1853			dev->net->stats.rx_dropped++;
1854
1855			if (header & RX_STS_CRC_) {
1856				dev->net->stats.rx_crc_errors++;
1857			} else {
1858				if (header & (RX_STS_TL_ | RX_STS_RF_))
1859					dev->net->stats.rx_frame_errors++;
1860
1861				if ((header & RX_STS_LE_) &&
1862					(!(header & RX_STS_FT_)))
1863					dev->net->stats.rx_length_errors++;
1864			}
1865		} else {
1866			/* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1867			if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1868				netif_dbg(dev, rx_err, dev->net,
1869					  "size err header=0x%08x\n", header);
1870				return 0;
1871			}
1872
1873			/* last frame in this batch */
1874			if (skb->len == size) {
1875				if (dev->net->features & NETIF_F_RXCSUM)
1876					smsc95xx_rx_csum_offload(skb);
1877				skb_trim(skb, skb->len - 4); /* remove fcs */
 
1878
1879				return 1;
1880			}
1881
1882			ax_skb = netdev_alloc_skb_ip_align(dev->net, size);
1883			if (unlikely(!ax_skb)) {
1884				netdev_warn(dev->net, "Error allocating skb\n");
1885				return 0;
1886			}
1887
1888			skb_put(ax_skb, size);
1889			memcpy(ax_skb->data, packet, size);
 
1890
1891			if (dev->net->features & NETIF_F_RXCSUM)
1892				smsc95xx_rx_csum_offload(ax_skb);
1893			skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
 
1894
1895			usbnet_skb_return(dev, ax_skb);
1896		}
1897
1898		skb_pull(skb, size);
1899
1900		/* padding bytes before the next frame starts */
1901		if (skb->len)
1902			skb_pull(skb, align_count);
1903	}
1904
1905	return 1;
1906}
1907
1908static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1909{
1910	u16 low_16 = (u16)skb_checksum_start_offset(skb);
1911	u16 high_16 = low_16 + skb->csum_offset;
1912	return (high_16 << 16) | low_16;
1913}
1914
1915/* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1916 * transmission. This is fairly unlikely, only seems to trigger with some
1917 * short TCP ACK packets sent.
1918 *
1919 * Note, this calculation should probably check for the alignment of the
1920 * data as well, but a straight check for csum being in the last four bytes
1921 * of the packet should be ok for now.
1922 */
1923static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1924{
1925       unsigned int len = skb->len - skb_checksum_start_offset(skb);
1926
1927       if (skb->len <= 45)
1928	       return false;
1929       return skb->csum_offset < (len - (4 + 1));
1930}
1931
1932static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1933					 struct sk_buff *skb, gfp_t flags)
1934{
1935	bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1936	int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1937	u32 tx_cmd_a, tx_cmd_b;
1938	void *ptr;
1939
1940	/* We do not advertise SG, so skbs should be already linearized */
1941	BUG_ON(skb_shinfo(skb)->nr_frags);
1942
1943	/* Make writable and expand header space by overhead if required */
1944	if (skb_cow_head(skb, overhead)) {
1945		/* Must deallocate here as returning NULL to indicate error
1946		 * means the skb won't be deallocated in the caller.
1947		 */
1948		dev_kfree_skb_any(skb);
1949		return NULL;
1950	}
1951
1952	tx_cmd_b = (u32)skb->len;
1953	tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1954
1955	if (csum) {
1956		if (!smsc95xx_can_tx_checksum(skb)) {
1957			/* workaround - hardware tx checksum does not work
1958			 * properly with extremely small packets */
1959			long csstart = skb_checksum_start_offset(skb);
1960			__wsum calc = csum_partial(skb->data + csstart,
1961				skb->len - csstart, 0);
1962			*((__sum16 *)(skb->data + csstart
1963				+ skb->csum_offset)) = csum_fold(calc);
1964
1965			csum = false;
1966		} else {
1967			u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1968			ptr = skb_push(skb, 4);
1969			put_unaligned_le32(csum_preamble, ptr);
1970
1971			tx_cmd_a += 4;
1972			tx_cmd_b += 4;
1973			tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1974		}
1975	}
1976
1977	ptr = skb_push(skb, 8);
1978	put_unaligned_le32(tx_cmd_a, ptr);
1979	put_unaligned_le32(tx_cmd_b, ptr+4);
1980
1981	return skb;
1982}
1983
1984static int smsc95xx_manage_power(struct usbnet *dev, int on)
1985{
1986	struct smsc95xx_priv *pdata = dev->driver_priv;
1987
1988	dev->intf->needs_remote_wakeup = on;
1989
1990	if (pdata->features & FEATURE_REMOTE_WAKEUP)
1991		return 0;
1992
1993	/* this chip revision isn't capable of remote wakeup */
1994	netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1995
1996	if (on)
1997		usb_autopm_get_interface_no_resume(dev->intf);
1998	else
1999		usb_autopm_put_interface(dev->intf);
2000
2001	return 0;
2002}
2003
2004static const struct driver_info smsc95xx_info = {
2005	.description	= "smsc95xx USB 2.0 Ethernet",
2006	.bind		= smsc95xx_bind,
2007	.unbind		= smsc95xx_unbind,
2008	.reset		= smsc95xx_reset,
2009	.check_connect	= smsc95xx_start_phy,
2010	.stop		= smsc95xx_stop,
2011	.rx_fixup	= smsc95xx_rx_fixup,
2012	.tx_fixup	= smsc95xx_tx_fixup,
2013	.status		= smsc95xx_status,
2014	.manage_power	= smsc95xx_manage_power,
2015	.flags		= FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2016};
2017
2018static const struct usb_device_id products[] = {
2019	{
2020		/* SMSC9500 USB Ethernet Device */
2021		USB_DEVICE(0x0424, 0x9500),
2022		.driver_info = (unsigned long) &smsc95xx_info,
2023	},
2024	{
2025		/* SMSC9505 USB Ethernet Device */
2026		USB_DEVICE(0x0424, 0x9505),
2027		.driver_info = (unsigned long) &smsc95xx_info,
2028	},
2029	{
2030		/* SMSC9500A USB Ethernet Device */
2031		USB_DEVICE(0x0424, 0x9E00),
2032		.driver_info = (unsigned long) &smsc95xx_info,
2033	},
2034	{
2035		/* SMSC9505A USB Ethernet Device */
2036		USB_DEVICE(0x0424, 0x9E01),
2037		.driver_info = (unsigned long) &smsc95xx_info,
2038	},
2039	{
2040		/* SMSC9512/9514 USB Hub & Ethernet Device */
2041		USB_DEVICE(0x0424, 0xec00),
2042		.driver_info = (unsigned long) &smsc95xx_info,
2043	},
2044	{
2045		/* SMSC9500 USB Ethernet Device (SAL10) */
2046		USB_DEVICE(0x0424, 0x9900),
2047		.driver_info = (unsigned long) &smsc95xx_info,
2048	},
2049	{
2050		/* SMSC9505 USB Ethernet Device (SAL10) */
2051		USB_DEVICE(0x0424, 0x9901),
2052		.driver_info = (unsigned long) &smsc95xx_info,
2053	},
2054	{
2055		/* SMSC9500A USB Ethernet Device (SAL10) */
2056		USB_DEVICE(0x0424, 0x9902),
2057		.driver_info = (unsigned long) &smsc95xx_info,
2058	},
2059	{
2060		/* SMSC9505A USB Ethernet Device (SAL10) */
2061		USB_DEVICE(0x0424, 0x9903),
2062		.driver_info = (unsigned long) &smsc95xx_info,
2063	},
2064	{
2065		/* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2066		USB_DEVICE(0x0424, 0x9904),
2067		.driver_info = (unsigned long) &smsc95xx_info,
2068	},
2069	{
2070		/* SMSC9500A USB Ethernet Device (HAL) */
2071		USB_DEVICE(0x0424, 0x9905),
2072		.driver_info = (unsigned long) &smsc95xx_info,
2073	},
2074	{
2075		/* SMSC9505A USB Ethernet Device (HAL) */
2076		USB_DEVICE(0x0424, 0x9906),
2077		.driver_info = (unsigned long) &smsc95xx_info,
2078	},
2079	{
2080		/* SMSC9500 USB Ethernet Device (Alternate ID) */
2081		USB_DEVICE(0x0424, 0x9907),
2082		.driver_info = (unsigned long) &smsc95xx_info,
2083	},
2084	{
2085		/* SMSC9500A USB Ethernet Device (Alternate ID) */
2086		USB_DEVICE(0x0424, 0x9908),
2087		.driver_info = (unsigned long) &smsc95xx_info,
2088	},
2089	{
2090		/* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2091		USB_DEVICE(0x0424, 0x9909),
2092		.driver_info = (unsigned long) &smsc95xx_info,
2093	},
2094	{
2095		/* SMSC LAN9530 USB Ethernet Device */
2096		USB_DEVICE(0x0424, 0x9530),
2097		.driver_info = (unsigned long) &smsc95xx_info,
2098	},
2099	{
2100		/* SMSC LAN9730 USB Ethernet Device */
2101		USB_DEVICE(0x0424, 0x9730),
2102		.driver_info = (unsigned long) &smsc95xx_info,
2103	},
2104	{
2105		/* SMSC LAN89530 USB Ethernet Device */
2106		USB_DEVICE(0x0424, 0x9E08),
2107		.driver_info = (unsigned long) &smsc95xx_info,
2108	},
2109	{
2110		/* SYSTEC USB-SPEmodule1 10BASE-T1L Ethernet Device */
2111		USB_DEVICE(0x0878, 0x1400),
2112		.driver_info = (unsigned long)&smsc95xx_info,
2113	},
2114	{
2115		/* Microchip's EVB-LAN8670-USB 10BASE-T1S Ethernet Device */
2116		USB_DEVICE(0x184F, 0x0051),
2117		.driver_info = (unsigned long)&smsc95xx_info,
2118	},
2119	{ },		/* END */
2120};
2121MODULE_DEVICE_TABLE(usb, products);
2122
2123static struct usb_driver smsc95xx_driver = {
2124	.name		= "smsc95xx",
2125	.id_table	= products,
2126	.probe		= usbnet_probe,
2127	.suspend	= smsc95xx_suspend,
2128	.resume		= smsc95xx_resume,
2129	.reset_resume	= smsc95xx_reset_resume,
2130	.disconnect	= usbnet_disconnect,
2131	.disable_hub_initiated_lpm = 1,
2132	.supports_autosuspend = 1,
2133};
2134
2135module_usb_driver(smsc95xx_driver);
2136
2137MODULE_AUTHOR("Nancy Lin");
2138MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2139MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2140MODULE_LICENSE("GPL");