Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/net/ethernet/smsc/smsc911x.c

  1 /***************************************************************************
  2  *
  3  * Copyright (C) 2004-2008 SMSC
  4  * Copyright (C) 2005-2008 ARM
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version 2
  9  * of the License, or (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 18  *
 19  ***************************************************************************
 20  * Rewritten, heavily based on smsc911x simple driver by SMSC.
 21  * Partly uses io macros from smc91x.c by Nicolas Pitre
 22  *
 23  * Supported devices:
 24  *   LAN9115, LAN9116, LAN9117, LAN9118
 25  *   LAN9215, LAN9216, LAN9217, LAN9218
 26  *   LAN9210, LAN9211
 27  *   LAN9220, LAN9221
 28  *   LAN89218
 29  *
 30  */
 31 
 32 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 33 
 34 #include <linux/crc32.h>
 35 #include <linux/clk.h>
 36 #include <linux/delay.h>
 37 #include <linux/errno.h>
 38 #include <linux/etherdevice.h>
 39 #include <linux/ethtool.h>
 40 #include <linux/init.h>
 41 #include <linux/interrupt.h>
 42 #include <linux/ioport.h>
 43 #include <linux/kernel.h>
 44 #include <linux/module.h>
 45 #include <linux/netdevice.h>
 46 #include <linux/platform_device.h>
 47 #include <linux/regulator/consumer.h>
 48 #include <linux/sched.h>
 49 #include <linux/timer.h>
 50 #include <linux/bug.h>
 51 #include <linux/bitops.h>
 52 #include <linux/irq.h>
 53 #include <linux/io.h>
 54 #include <linux/swab.h>
 55 #include <linux/phy.h>
 56 #include <linux/smsc911x.h>
 57 #include <linux/device.h>
 58 #include <linux/of.h>
 59 #include <linux/of_device.h>
 60 #include <linux/of_gpio.h>
 61 #include <linux/of_net.h>
 62 #include "smsc911x.h"
 63 
 64 #define SMSC_CHIPNAME           "smsc911x"
 65 #define SMSC_MDIONAME           "smsc911x-mdio"
 66 #define SMSC_DRV_VERSION        "2008-10-21"
 67 
 68 MODULE_LICENSE("GPL");
 69 MODULE_VERSION(SMSC_DRV_VERSION);
 70 MODULE_ALIAS("platform:smsc911x");
 71 
 72 #if USE_DEBUG > 0
 73 static int debug = 16;
 74 #else
 75 static int debug = 3;
 76 #endif
 77 
 78 module_param(debug, int, 0);
 79 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 80 
 81 struct smsc911x_data;
 82 
 83 struct smsc911x_ops {
 84         u32 (*reg_read)(struct smsc911x_data *pdata, u32 reg);
 85         void (*reg_write)(struct smsc911x_data *pdata, u32 reg, u32 val);
 86         void (*rx_readfifo)(struct smsc911x_data *pdata,
 87                                 unsigned int *buf, unsigned int wordcount);
 88         void (*tx_writefifo)(struct smsc911x_data *pdata,
 89                                 unsigned int *buf, unsigned int wordcount);
 90 };
 91 
 92 #define SMSC911X_NUM_SUPPLIES 2
 93 
 94 struct smsc911x_data {
 95         void __iomem *ioaddr;
 96 
 97         unsigned int idrev;
 98 
 99         /* used to decide which workarounds apply */
100         unsigned int generation;
101 
102         /* device configuration (copied from platform_data during probe) */
103         struct smsc911x_platform_config config;
104 
105         /* This needs to be acquired before calling any of below:
106          * smsc911x_mac_read(), smsc911x_mac_write()
107          */
108         spinlock_t mac_lock;
109 
110         /* spinlock to ensure register accesses are serialised */
111         spinlock_t dev_lock;
112 
113         struct phy_device *phy_dev;
114         struct mii_bus *mii_bus;
115         int phy_irq[PHY_MAX_ADDR];
116         unsigned int using_extphy;
117         int last_duplex;
118         int last_carrier;
119 
120         u32 msg_enable;
121         unsigned int gpio_setting;
122         unsigned int gpio_orig_setting;
123         struct net_device *dev;
124         struct napi_struct napi;
125 
126         unsigned int software_irq_signal;
127 
128 #ifdef USE_PHY_WORK_AROUND
129 #define MIN_PACKET_SIZE (64)
130         char loopback_tx_pkt[MIN_PACKET_SIZE];
131         char loopback_rx_pkt[MIN_PACKET_SIZE];
132         unsigned int resetcount;
133 #endif
134 
135         /* Members for Multicast filter workaround */
136         unsigned int multicast_update_pending;
137         unsigned int set_bits_mask;
138         unsigned int clear_bits_mask;
139         unsigned int hashhi;
140         unsigned int hashlo;
141 
142         /* register access functions */
143         const struct smsc911x_ops *ops;
144 
145         /* regulators */
146         struct regulator_bulk_data supplies[SMSC911X_NUM_SUPPLIES];
147 
148         /* clock */
149         struct clk *clk;
150 };
151 
152 /* Easy access to information */
153 #define __smsc_shift(pdata, reg) ((reg) << ((pdata)->config.shift))
154 
155 static inline u32 __smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
156 {
157         if (pdata->config.flags & SMSC911X_USE_32BIT)
158                 return readl(pdata->ioaddr + reg);
159 
160         if (pdata->config.flags & SMSC911X_USE_16BIT)
161                 return ((readw(pdata->ioaddr + reg) & 0xFFFF) |
162                         ((readw(pdata->ioaddr + reg + 2) & 0xFFFF) << 16));
163 
164         BUG();
165         return 0;
166 }
167 
168 static inline u32
169 __smsc911x_reg_read_shift(struct smsc911x_data *pdata, u32 reg)
170 {
171         if (pdata->config.flags & SMSC911X_USE_32BIT)
172                 return readl(pdata->ioaddr + __smsc_shift(pdata, reg));
173 
174         if (pdata->config.flags & SMSC911X_USE_16BIT)
175                 return (readw(pdata->ioaddr +
176                                 __smsc_shift(pdata, reg)) & 0xFFFF) |
177                         ((readw(pdata->ioaddr +
178                         __smsc_shift(pdata, reg + 2)) & 0xFFFF) << 16);
179 
180         BUG();
181         return 0;
182 }
183 
184 static inline u32 smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
185 {
186         u32 data;
187         unsigned long flags;
188 
189         spin_lock_irqsave(&pdata->dev_lock, flags);
190         data = pdata->ops->reg_read(pdata, reg);
191         spin_unlock_irqrestore(&pdata->dev_lock, flags);
192 
193         return data;
194 }
195 
196 static inline void __smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
197                                         u32 val)
198 {
199         if (pdata->config.flags & SMSC911X_USE_32BIT) {
200                 writel(val, pdata->ioaddr + reg);
201                 return;
202         }
203 
204         if (pdata->config.flags & SMSC911X_USE_16BIT) {
205                 writew(val & 0xFFFF, pdata->ioaddr + reg);
206                 writew((val >> 16) & 0xFFFF, pdata->ioaddr + reg + 2);
207                 return;
208         }
209 
210         BUG();
211 }
212 
213 static inline void
214 __smsc911x_reg_write_shift(struct smsc911x_data *pdata, u32 reg, u32 val)
215 {
216         if (pdata->config.flags & SMSC911X_USE_32BIT) {
217                 writel(val, pdata->ioaddr + __smsc_shift(pdata, reg));
218                 return;
219         }
220 
221         if (pdata->config.flags & SMSC911X_USE_16BIT) {
222                 writew(val & 0xFFFF,
223                         pdata->ioaddr + __smsc_shift(pdata, reg));
224                 writew((val >> 16) & 0xFFFF,
225                         pdata->ioaddr + __smsc_shift(pdata, reg + 2));
226                 return;
227         }
228 
229         BUG();
230 }
231 
232 static inline void smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
233                                       u32 val)
234 {
235         unsigned long flags;
236 
237         spin_lock_irqsave(&pdata->dev_lock, flags);
238         pdata->ops->reg_write(pdata, reg, val);
239         spin_unlock_irqrestore(&pdata->dev_lock, flags);
240 }
241 
242 /* Writes a packet to the TX_DATA_FIFO */
243 static inline void
244 smsc911x_tx_writefifo(struct smsc911x_data *pdata, unsigned int *buf,
245                       unsigned int wordcount)
246 {
247         unsigned long flags;
248 
249         spin_lock_irqsave(&pdata->dev_lock, flags);
250 
251         if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
252                 while (wordcount--)
253                         __smsc911x_reg_write(pdata, TX_DATA_FIFO,
254                                              swab32(*buf++));
255                 goto out;
256         }
257 
258         if (pdata->config.flags & SMSC911X_USE_32BIT) {
259                 iowrite32_rep(pdata->ioaddr + TX_DATA_FIFO, buf, wordcount);
260                 goto out;
261         }
262 
263         if (pdata->config.flags & SMSC911X_USE_16BIT) {
264                 while (wordcount--)
265                         __smsc911x_reg_write(pdata, TX_DATA_FIFO, *buf++);
266                 goto out;
267         }
268 
269         BUG();
270 out:
271         spin_unlock_irqrestore(&pdata->dev_lock, flags);
272 }
273 
274 /* Writes a packet to the TX_DATA_FIFO - shifted version */
275 static inline void
276 smsc911x_tx_writefifo_shift(struct smsc911x_data *pdata, unsigned int *buf,
277                       unsigned int wordcount)
278 {
279         unsigned long flags;
280 
281         spin_lock_irqsave(&pdata->dev_lock, flags);
282 
283         if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
284                 while (wordcount--)
285                         __smsc911x_reg_write_shift(pdata, TX_DATA_FIFO,
286                                              swab32(*buf++));
287                 goto out;
288         }
289 
290         if (pdata->config.flags & SMSC911X_USE_32BIT) {
291                 iowrite32_rep(pdata->ioaddr + __smsc_shift(pdata,
292                                                 TX_DATA_FIFO), buf, wordcount);
293                 goto out;
294         }
295 
296         if (pdata->config.flags & SMSC911X_USE_16BIT) {
297                 while (wordcount--)
298                         __smsc911x_reg_write_shift(pdata,
299                                                  TX_DATA_FIFO, *buf++);
300                 goto out;
301         }
302 
303         BUG();
304 out:
305         spin_unlock_irqrestore(&pdata->dev_lock, flags);
306 }
307 
308 /* Reads a packet out of the RX_DATA_FIFO */
309 static inline void
310 smsc911x_rx_readfifo(struct smsc911x_data *pdata, unsigned int *buf,
311                      unsigned int wordcount)
312 {
313         unsigned long flags;
314 
315         spin_lock_irqsave(&pdata->dev_lock, flags);
316 
317         if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
318                 while (wordcount--)
319                         *buf++ = swab32(__smsc911x_reg_read(pdata,
320                                                             RX_DATA_FIFO));
321                 goto out;
322         }
323 
324         if (pdata->config.flags & SMSC911X_USE_32BIT) {
325                 ioread32_rep(pdata->ioaddr + RX_DATA_FIFO, buf, wordcount);
326                 goto out;
327         }
328 
329         if (pdata->config.flags & SMSC911X_USE_16BIT) {
330                 while (wordcount--)
331                         *buf++ = __smsc911x_reg_read(pdata, RX_DATA_FIFO);
332                 goto out;
333         }
334 
335         BUG();
336 out:
337         spin_unlock_irqrestore(&pdata->dev_lock, flags);
338 }
339 
340 /* Reads a packet out of the RX_DATA_FIFO - shifted version */
341 static inline void
342 smsc911x_rx_readfifo_shift(struct smsc911x_data *pdata, unsigned int *buf,
343                      unsigned int wordcount)
344 {
345         unsigned long flags;
346 
347         spin_lock_irqsave(&pdata->dev_lock, flags);
348 
349         if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
350                 while (wordcount--)
351                         *buf++ = swab32(__smsc911x_reg_read_shift(pdata,
352                                                             RX_DATA_FIFO));
353                 goto out;
354         }
355 
356         if (pdata->config.flags & SMSC911X_USE_32BIT) {
357                 ioread32_rep(pdata->ioaddr + __smsc_shift(pdata,
358                                                 RX_DATA_FIFO), buf, wordcount);
359                 goto out;
360         }
361 
362         if (pdata->config.flags & SMSC911X_USE_16BIT) {
363                 while (wordcount--)
364                         *buf++ = __smsc911x_reg_read_shift(pdata,
365                                                                 RX_DATA_FIFO);
366                 goto out;
367         }
368 
369         BUG();
370 out:
371         spin_unlock_irqrestore(&pdata->dev_lock, flags);
372 }
373 
374 /*
375  * enable regulator and clock resources.
376  */
377 static int smsc911x_enable_resources(struct platform_device *pdev)
378 {
379         struct net_device *ndev = platform_get_drvdata(pdev);
380         struct smsc911x_data *pdata = netdev_priv(ndev);
381         int ret = 0;
382 
383         ret = regulator_bulk_enable(ARRAY_SIZE(pdata->supplies),
384                         pdata->supplies);
385         if (ret)
386                 netdev_err(ndev, "failed to enable regulators %d\n",
387                                 ret);
388 
389         if (!IS_ERR(pdata->clk)) {
390                 ret = clk_prepare_enable(pdata->clk);
391                 if (ret < 0)
392                         netdev_err(ndev, "failed to enable clock %d\n", ret);
393         }
394 
395         return ret;
396 }
397 
398 /*
399  * disable resources, currently just regulators.
400  */
401 static int smsc911x_disable_resources(struct platform_device *pdev)
402 {
403         struct net_device *ndev = platform_get_drvdata(pdev);
404         struct smsc911x_data *pdata = netdev_priv(ndev);
405         int ret = 0;
406 
407         ret = regulator_bulk_disable(ARRAY_SIZE(pdata->supplies),
408                         pdata->supplies);
409 
410         if (!IS_ERR(pdata->clk))
411                 clk_disable_unprepare(pdata->clk);
412 
413         return ret;
414 }
415 
416 /*
417  * Request resources, currently just regulators.
418  *
419  * The SMSC911x has two power pins: vddvario and vdd33a, in designs where
420  * these are not always-on we need to request regulators to be turned on
421  * before we can try to access the device registers.
422  */
423 static int smsc911x_request_resources(struct platform_device *pdev)
424 {
425         struct net_device *ndev = platform_get_drvdata(pdev);
426         struct smsc911x_data *pdata = netdev_priv(ndev);
427         int ret = 0;
428 
429         /* Request regulators */
430         pdata->supplies[0].supply = "vdd33a";
431         pdata->supplies[1].supply = "vddvario";
432         ret = regulator_bulk_get(&pdev->dev,
433                         ARRAY_SIZE(pdata->supplies),
434                         pdata->supplies);
435         if (ret)
436                 netdev_err(ndev, "couldn't get regulators %d\n",
437                                 ret);
438 
439         /* Request clock */
440         pdata->clk = clk_get(&pdev->dev, NULL);
441         if (IS_ERR(pdata->clk))
442                 dev_dbg(&pdev->dev, "couldn't get clock %li\n",
443                         PTR_ERR(pdata->clk));
444 
445         return ret;
446 }
447 
448 /*
449  * Free resources, currently just regulators.
450  *
451  */
452 static void smsc911x_free_resources(struct platform_device *pdev)
453 {
454         struct net_device *ndev = platform_get_drvdata(pdev);
455         struct smsc911x_data *pdata = netdev_priv(ndev);
456 
457         /* Free regulators */
458         regulator_bulk_free(ARRAY_SIZE(pdata->supplies),
459                         pdata->supplies);
460 
461         /* Free clock */
462         if (!IS_ERR(pdata->clk)) {
463                 clk_put(pdata->clk);
464                 pdata->clk = NULL;
465         }
466 }
467 
468 /* waits for MAC not busy, with timeout.  Only called by smsc911x_mac_read
469  * and smsc911x_mac_write, so assumes mac_lock is held */
470 static int smsc911x_mac_complete(struct smsc911x_data *pdata)
471 {
472         int i;
473         u32 val;
474 
475         SMSC_ASSERT_MAC_LOCK(pdata);
476 
477         for (i = 0; i < 40; i++) {
478                 val = smsc911x_reg_read(pdata, MAC_CSR_CMD);
479                 if (!(val & MAC_CSR_CMD_CSR_BUSY_))
480                         return 0;
481         }
482         SMSC_WARN(pdata, hw, "Timed out waiting for MAC not BUSY. "
483                   "MAC_CSR_CMD: 0x%08X", val);
484         return -EIO;
485 }
486 
487 /* Fetches a MAC register value. Assumes mac_lock is acquired */
488 static u32 smsc911x_mac_read(struct smsc911x_data *pdata, unsigned int offset)
489 {
490         unsigned int temp;
491 
492         SMSC_ASSERT_MAC_LOCK(pdata);
493 
494         temp = smsc911x_reg_read(pdata, MAC_CSR_CMD);
495         if (unlikely(temp & MAC_CSR_CMD_CSR_BUSY_)) {
496                 SMSC_WARN(pdata, hw, "MAC busy at entry");
497                 return 0xFFFFFFFF;
498         }
499 
500         /* Send the MAC cmd */
501         smsc911x_reg_write(pdata, MAC_CSR_CMD, ((offset & 0xFF) |
502                 MAC_CSR_CMD_CSR_BUSY_ | MAC_CSR_CMD_R_NOT_W_));
503 
504         /* Workaround for hardware read-after-write restriction */
505         temp = smsc911x_reg_read(pdata, BYTE_TEST);
506 
507         /* Wait for the read to complete */
508         if (likely(smsc911x_mac_complete(pdata) == 0))
509                 return smsc911x_reg_read(pdata, MAC_CSR_DATA);
510 
511         SMSC_WARN(pdata, hw, "MAC busy after read");
512         return 0xFFFFFFFF;
513 }
514 
515 /* Set a mac register, mac_lock must be acquired before calling */
516 static void smsc911x_mac_write(struct smsc911x_data *pdata,
517                                unsigned int offset, u32 val)
518 {
519         unsigned int temp;
520 
521         SMSC_ASSERT_MAC_LOCK(pdata);
522 
523         temp = smsc911x_reg_read(pdata, MAC_CSR_CMD);
524         if (unlikely(temp & MAC_CSR_CMD_CSR_BUSY_)) {
525                 SMSC_WARN(pdata, hw,
526                           "smsc911x_mac_write failed, MAC busy at entry");
527                 return;
528         }
529 
530         /* Send data to write */
531         smsc911x_reg_write(pdata, MAC_CSR_DATA, val);
532 
533         /* Write the actual data */
534         smsc911x_reg_write(pdata, MAC_CSR_CMD, ((offset & 0xFF) |
535                 MAC_CSR_CMD_CSR_BUSY_));
536 
537         /* Workaround for hardware read-after-write restriction */
538         temp = smsc911x_reg_read(pdata, BYTE_TEST);
539 
540         /* Wait for the write to complete */
541         if (likely(smsc911x_mac_complete(pdata) == 0))
542                 return;
543 
544         SMSC_WARN(pdata, hw, "smsc911x_mac_write failed, MAC busy after write");
545 }
546 
547 /* Get a phy register */
548 static int smsc911x_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
549 {
550         struct smsc911x_data *pdata = (struct smsc911x_data *)bus->priv;
551         unsigned long flags;
552         unsigned int addr;
553         int i, reg;
554 
555         spin_lock_irqsave(&pdata->mac_lock, flags);
556 
557         /* Confirm MII not busy */
558         if (unlikely(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
559                 SMSC_WARN(pdata, hw, "MII is busy in smsc911x_mii_read???");
560                 reg = -EIO;
561                 goto out;
562         }
563 
564         /* Set the address, index & direction (read from PHY) */
565         addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6);
566         smsc911x_mac_write(pdata, MII_ACC, addr);
567 
568         /* Wait for read to complete w/ timeout */
569         for (i = 0; i < 100; i++)
570                 if (!(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
571                         reg = smsc911x_mac_read(pdata, MII_DATA);
572                         goto out;
573                 }
574 
575         SMSC_WARN(pdata, hw, "Timed out waiting for MII read to finish");
576         reg = -EIO;
577 
578 out:
579         spin_unlock_irqrestore(&pdata->mac_lock, flags);
580         return reg;
581 }
582 
583 /* Set a phy register */
584 static int smsc911x_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
585                            u16 val)
586 {
587         struct smsc911x_data *pdata = (struct smsc911x_data *)bus->priv;
588         unsigned long flags;
589         unsigned int addr;
590         int i, reg;
591 
592         spin_lock_irqsave(&pdata->mac_lock, flags);
593 
594         /* Confirm MII not busy */
595         if (unlikely(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
596                 SMSC_WARN(pdata, hw, "MII is busy in smsc911x_mii_write???");
597                 reg = -EIO;
598                 goto out;
599         }
600 
601         /* Put the data to write in the MAC */
602         smsc911x_mac_write(pdata, MII_DATA, val);
603 
604         /* Set the address, index & direction (write to PHY) */
605         addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6) |
606                 MII_ACC_MII_WRITE_;
607         smsc911x_mac_write(pdata, MII_ACC, addr);
608 
609         /* Wait for write to complete w/ timeout */
610         for (i = 0; i < 100; i++)
611                 if (!(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
612                         reg = 0;
613                         goto out;
614                 }
615 
616         SMSC_WARN(pdata, hw, "Timed out waiting for MII write to finish");
617         reg = -EIO;
618 
619 out:
620         spin_unlock_irqrestore(&pdata->mac_lock, flags);
621         return reg;
622 }
623 
624 /* Switch to external phy. Assumes tx and rx are stopped. */
625 static void smsc911x_phy_enable_external(struct smsc911x_data *pdata)
626 {
627         unsigned int hwcfg = smsc911x_reg_read(pdata, HW_CFG);
628 
629         /* Disable phy clocks to the MAC */
630         hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
631         hwcfg |= HW_CFG_PHY_CLK_SEL_CLK_DIS_;
632         smsc911x_reg_write(pdata, HW_CFG, hwcfg);
633         udelay(10);     /* Enough time for clocks to stop */
634 
635         /* Switch to external phy */
636         hwcfg |= HW_CFG_EXT_PHY_EN_;
637         smsc911x_reg_write(pdata, HW_CFG, hwcfg);
638 
639         /* Enable phy clocks to the MAC */
640         hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
641         hwcfg |= HW_CFG_PHY_CLK_SEL_EXT_PHY_;
642         smsc911x_reg_write(pdata, HW_CFG, hwcfg);
643         udelay(10);     /* Enough time for clocks to restart */
644 
645         hwcfg |= HW_CFG_SMI_SEL_;
646         smsc911x_reg_write(pdata, HW_CFG, hwcfg);
647 }
648 
649 /* Autodetects and enables external phy if present on supported chips.
650  * autodetection can be overridden by specifying SMSC911X_FORCE_INTERNAL_PHY
651  * or SMSC911X_FORCE_EXTERNAL_PHY in the platform_data flags. */
652 static void smsc911x_phy_initialise_external(struct smsc911x_data *pdata)
653 {
654         unsigned int hwcfg = smsc911x_reg_read(pdata, HW_CFG);
655 
656         if (pdata->config.flags & SMSC911X_FORCE_INTERNAL_PHY) {
657                 SMSC_TRACE(pdata, hw, "Forcing internal PHY");
658                 pdata->using_extphy = 0;
659         } else if (pdata->config.flags & SMSC911X_FORCE_EXTERNAL_PHY) {
660                 SMSC_TRACE(pdata, hw, "Forcing external PHY");
661                 smsc911x_phy_enable_external(pdata);
662                 pdata->using_extphy = 1;
663         } else if (hwcfg & HW_CFG_EXT_PHY_DET_) {
664                 SMSC_TRACE(pdata, hw,
665                            "HW_CFG EXT_PHY_DET set, using external PHY");
666                 smsc911x_phy_enable_external(pdata);
667                 pdata->using_extphy = 1;
668         } else {
669                 SMSC_TRACE(pdata, hw,
670                            "HW_CFG EXT_PHY_DET clear, using internal PHY");
671                 pdata->using_extphy = 0;
672         }
673 }
674 
675 /* Fetches a tx status out of the status fifo */
676 static unsigned int smsc911x_tx_get_txstatus(struct smsc911x_data *pdata)
677 {
678         unsigned int result =
679             smsc911x_reg_read(pdata, TX_FIFO_INF) & TX_FIFO_INF_TSUSED_;
680 
681         if (result != 0)
682                 result = smsc911x_reg_read(pdata, TX_STATUS_FIFO);
683 
684         return result;
685 }
686 
687 /* Fetches the next rx status */
688 static unsigned int smsc911x_rx_get_rxstatus(struct smsc911x_data *pdata)
689 {
690         unsigned int result =
691             smsc911x_reg_read(pdata, RX_FIFO_INF) & RX_FIFO_INF_RXSUSED_;
692 
693         if (result != 0)
694                 result = smsc911x_reg_read(pdata, RX_STATUS_FIFO);
695 
696         return result;
697 }
698 
699 #ifdef USE_PHY_WORK_AROUND
700 static int smsc911x_phy_check_loopbackpkt(struct smsc911x_data *pdata)
701 {
702         unsigned int tries;
703         u32 wrsz;
704         u32 rdsz;
705         ulong bufp;
706 
707         for (tries = 0; tries < 10; tries++) {
708                 unsigned int txcmd_a;
709                 unsigned int txcmd_b;
710                 unsigned int status;
711                 unsigned int pktlength;
712                 unsigned int i;
713 
714                 /* Zero-out rx packet memory */
715                 memset(pdata->loopback_rx_pkt, 0, MIN_PACKET_SIZE);
716 
717                 /* Write tx packet to 118 */
718                 txcmd_a = (u32)((ulong)pdata->loopback_tx_pkt & 0x03) << 16;
719                 txcmd_a |= TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
720                 txcmd_a |= MIN_PACKET_SIZE;
721 
722                 txcmd_b = MIN_PACKET_SIZE << 16 | MIN_PACKET_SIZE;
723 
724                 smsc911x_reg_write(pdata, TX_DATA_FIFO, txcmd_a);
725                 smsc911x_reg_write(pdata, TX_DATA_FIFO, txcmd_b);
726 
727                 bufp = (ulong)pdata->loopback_tx_pkt & (~0x3);
728                 wrsz = MIN_PACKET_SIZE + 3;
729                 wrsz += (u32)((ulong)pdata->loopback_tx_pkt & 0x3);
730                 wrsz >>= 2;
731 
732                 pdata->ops->tx_writefifo(pdata, (unsigned int *)bufp, wrsz);
733 
734                 /* Wait till transmit is done */
735                 i = 60;
736                 do {
737                         udelay(5);
738                         status = smsc911x_tx_get_txstatus(pdata);
739                 } while ((i--) && (!status));
740 
741                 if (!status) {
742                         SMSC_WARN(pdata, hw,
743                                   "Failed to transmit during loopback test");
744                         continue;
745                 }
746                 if (status & TX_STS_ES_) {
747                         SMSC_WARN(pdata, hw,
748                                   "Transmit encountered errors during loopback test");
749                         continue;
750                 }
751 
752                 /* Wait till receive is done */
753                 i = 60;
754                 do {
755                         udelay(5);
756                         status = smsc911x_rx_get_rxstatus(pdata);
757                 } while ((i--) && (!status));
758 
759                 if (!status) {
760                         SMSC_WARN(pdata, hw,
761                                   "Failed to receive during loopback test");
762                         continue;
763                 }
764                 if (status & RX_STS_ES_) {
765                         SMSC_WARN(pdata, hw,
766                                   "Receive encountered errors during loopback test");
767                         continue;
768                 }
769 
770                 pktlength = ((status & 0x3FFF0000UL) >> 16);
771                 bufp = (ulong)pdata->loopback_rx_pkt;
772                 rdsz = pktlength + 3;
773                 rdsz += (u32)((ulong)pdata->loopback_rx_pkt & 0x3);
774                 rdsz >>= 2;
775 
776                 pdata->ops->rx_readfifo(pdata, (unsigned int *)bufp, rdsz);
777 
778                 if (pktlength != (MIN_PACKET_SIZE + 4)) {
779                         SMSC_WARN(pdata, hw, "Unexpected packet size "
780                                   "during loop back test, size=%d, will retry",
781                                   pktlength);
782                 } else {
783                         unsigned int j;
784                         int mismatch = 0;
785                         for (j = 0; j < MIN_PACKET_SIZE; j++) {
786                                 if (pdata->loopback_tx_pkt[j]
787                                     != pdata->loopback_rx_pkt[j]) {
788                                         mismatch = 1;
789                                         break;
790                                 }
791                         }
792                         if (!mismatch) {
793                                 SMSC_TRACE(pdata, hw, "Successfully verified "
794                                            "loopback packet");
795                                 return 0;
796                         } else {
797                                 SMSC_WARN(pdata, hw, "Data mismatch "
798                                           "during loop back test, will retry");
799                         }
800                 }
801         }
802 
803         return -EIO;
804 }
805 
806 static int smsc911x_phy_reset(struct smsc911x_data *pdata)
807 {
808         struct phy_device *phy_dev = pdata->phy_dev;
809         unsigned int temp;
810         unsigned int i = 100000;
811 
812         BUG_ON(!phy_dev);
813         BUG_ON(!phy_dev->bus);
814 
815         SMSC_TRACE(pdata, hw, "Performing PHY BCR Reset");
816         smsc911x_mii_write(phy_dev->bus, phy_dev->addr, MII_BMCR, BMCR_RESET);
817         do {
818                 msleep(1);
819                 temp = smsc911x_mii_read(phy_dev->bus, phy_dev->addr,
820                         MII_BMCR);
821         } while ((i--) && (temp & BMCR_RESET));
822 
823         if (temp & BMCR_RESET) {
824                 SMSC_WARN(pdata, hw, "PHY reset failed to complete");
825                 return -EIO;
826         }
827         /* Extra delay required because the phy may not be completed with
828         * its reset when BMCR_RESET is cleared. Specs say 256 uS is
829         * enough delay but using 1ms here to be safe */
830         msleep(1);
831 
832         return 0;
833 }
834 
835 static int smsc911x_phy_loopbacktest(struct net_device *dev)
836 {
837         struct smsc911x_data *pdata = netdev_priv(dev);
838         struct phy_device *phy_dev = pdata->phy_dev;
839         int result = -EIO;
840         unsigned int i, val;
841         unsigned long flags;
842 
843         /* Initialise tx packet using broadcast destination address */
844         memset(pdata->loopback_tx_pkt, 0xff, ETH_ALEN);
845 
846         /* Use incrementing source address */
847         for (i = 6; i < 12; i++)
848                 pdata->loopback_tx_pkt[i] = (char)i;
849 
850         /* Set length type field */
851         pdata->loopback_tx_pkt[12] = 0x00;
852         pdata->loopback_tx_pkt[13] = 0x00;
853 
854         for (i = 14; i < MIN_PACKET_SIZE; i++)
855                 pdata->loopback_tx_pkt[i] = (char)i;
856 
857         val = smsc911x_reg_read(pdata, HW_CFG);
858         val &= HW_CFG_TX_FIF_SZ_;
859         val |= HW_CFG_SF_;
860         smsc911x_reg_write(pdata, HW_CFG, val);
861 
862         smsc911x_reg_write(pdata, TX_CFG, TX_CFG_TX_ON_);
863         smsc911x_reg_write(pdata, RX_CFG,
864                 (u32)((ulong)pdata->loopback_rx_pkt & 0x03) << 8);
865 
866         for (i = 0; i < 10; i++) {
867                 /* Set PHY to 10/FD, no ANEG, and loopback mode */
868                 smsc911x_mii_write(phy_dev->bus, phy_dev->addr, MII_BMCR,
869                         BMCR_LOOPBACK | BMCR_FULLDPLX);
870 
871                 /* Enable MAC tx/rx, FD */
872                 spin_lock_irqsave(&pdata->mac_lock, flags);
873                 smsc911x_mac_write(pdata, MAC_CR, MAC_CR_FDPX_
874                                    | MAC_CR_TXEN_ | MAC_CR_RXEN_);
875                 spin_unlock_irqrestore(&pdata->mac_lock, flags);
876 
877                 if (smsc911x_phy_check_loopbackpkt(pdata) == 0) {
878                         result = 0;
879                         break;
880                 }
881                 pdata->resetcount++;
882 
883                 /* Disable MAC rx */
884                 spin_lock_irqsave(&pdata->mac_lock, flags);
885                 smsc911x_mac_write(pdata, MAC_CR, 0);
886                 spin_unlock_irqrestore(&pdata->mac_lock, flags);
887 
888                 smsc911x_phy_reset(pdata);
889         }
890 
891         /* Disable MAC */
892         spin_lock_irqsave(&pdata->mac_lock, flags);
893         smsc911x_mac_write(pdata, MAC_CR, 0);
894         spin_unlock_irqrestore(&pdata->mac_lock, flags);
895 
896         /* Cancel PHY loopback mode */
897         smsc911x_mii_write(phy_dev->bus, phy_dev->addr, MII_BMCR, 0);
898 
899         smsc911x_reg_write(pdata, TX_CFG, 0);
900         smsc911x_reg_write(pdata, RX_CFG, 0);
901 
902         return result;
903 }
904 #endif                          /* USE_PHY_WORK_AROUND */
905 
906 static void smsc911x_phy_update_flowcontrol(struct smsc911x_data *pdata)
907 {
908         struct phy_device *phy_dev = pdata->phy_dev;
909         u32 afc = smsc911x_reg_read(pdata, AFC_CFG);
910         u32 flow;
911         unsigned long flags;
912 
913         if (phy_dev->duplex == DUPLEX_FULL) {
914                 u16 lcladv = phy_read(phy_dev, MII_ADVERTISE);
915                 u16 rmtadv = phy_read(phy_dev, MII_LPA);
916                 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
917 
918                 if (cap & FLOW_CTRL_RX)
919                         flow = 0xFFFF0002;
920                 else
921                         flow = 0;
922 
923                 if (cap & FLOW_CTRL_TX)
924                         afc |= 0xF;
925                 else
926                         afc &= ~0xF;
927 
928                 SMSC_TRACE(pdata, hw, "rx pause %s, tx pause %s",
929                            (cap & FLOW_CTRL_RX ? "enabled" : "disabled"),
930                            (cap & FLOW_CTRL_TX ? "enabled" : "disabled"));
931         } else {
932                 SMSC_TRACE(pdata, hw, "half duplex");
933                 flow = 0;
934                 afc |= 0xF;
935         }
936 
937         spin_lock_irqsave(&pdata->mac_lock, flags);
938         smsc911x_mac_write(pdata, FLOW, flow);
939         spin_unlock_irqrestore(&pdata->mac_lock, flags);
940 
941         smsc911x_reg_write(pdata, AFC_CFG, afc);
942 }
943 
944 /* Update link mode if anything has changed.  Called periodically when the
945  * PHY is in polling mode, even if nothing has changed. */
946 static void smsc911x_phy_adjust_link(struct net_device *dev)
947 {
948         struct smsc911x_data *pdata = netdev_priv(dev);
949         struct phy_device *phy_dev = pdata->phy_dev;
950         unsigned long flags;
951         int carrier;
952 
953         if (phy_dev->duplex != pdata->last_duplex) {
954                 unsigned int mac_cr;
955                 SMSC_TRACE(pdata, hw, "duplex state has changed");
956 
957                 spin_lock_irqsave(&pdata->mac_lock, flags);
958                 mac_cr = smsc911x_mac_read(pdata, MAC_CR);
959                 if (phy_dev->duplex) {
960                         SMSC_TRACE(pdata, hw,
961                                    "configuring for full duplex mode");
962                         mac_cr |= MAC_CR_FDPX_;
963                 } else {
964                         SMSC_TRACE(pdata, hw,
965                                    "configuring for half duplex mode");
966                         mac_cr &= ~MAC_CR_FDPX_;
967                 }
968                 smsc911x_mac_write(pdata, MAC_CR, mac_cr);
969                 spin_unlock_irqrestore(&pdata->mac_lock, flags);
970 
971                 smsc911x_phy_update_flowcontrol(pdata);
972                 pdata->last_duplex = phy_dev->duplex;
973         }
974 
975         carrier = netif_carrier_ok(dev);
976         if (carrier != pdata->last_carrier) {
977                 SMSC_TRACE(pdata, hw, "carrier state has changed");
978                 if (carrier) {
979                         SMSC_TRACE(pdata, hw, "configuring for carrier OK");
980                         if ((pdata->gpio_orig_setting & GPIO_CFG_LED1_EN_) &&
981                             (!pdata->using_extphy)) {
982                                 /* Restore original GPIO configuration */
983                                 pdata->gpio_setting = pdata->gpio_orig_setting;
984                                 smsc911x_reg_write(pdata, GPIO_CFG,
985                                         pdata->gpio_setting);
986                         }
987                 } else {
988                         SMSC_TRACE(pdata, hw, "configuring for no carrier");
989                         /* Check global setting that LED1
990                          * usage is 10/100 indicator */
991                         pdata->gpio_setting = smsc911x_reg_read(pdata,
992                                 GPIO_CFG);
993                         if ((pdata->gpio_setting & GPIO_CFG_LED1_EN_) &&
994                             (!pdata->using_extphy)) {
995                                 /* Force 10/100 LED off, after saving
996                                  * original GPIO configuration */
997                                 pdata->gpio_orig_setting = pdata->gpio_setting;
998 
999                                 pdata->gpio_setting &= ~GPIO_CFG_LED1_EN_;
1000                                 pdata->gpio_setting |= (GPIO_CFG_GPIOBUF0_
1001                                                         | GPIO_CFG_GPIODIR0_
1002                                                         | GPIO_CFG_GPIOD0_);
1003                                 smsc911x_reg_write(pdata, GPIO_CFG,
1004                                         pdata->gpio_setting);
1005                         }
1006                 }
1007                 pdata->last_carrier = carrier;
1008         }
1009 }
1010 
1011 static int smsc911x_mii_probe(struct net_device *dev)
1012 {
1013         struct smsc911x_data *pdata = netdev_priv(dev);
1014         struct phy_device *phydev = NULL;
1015         int ret;
1016 
1017         /* find the first phy */
1018         phydev = phy_find_first(pdata->mii_bus);
1019         if (!phydev) {
1020                 netdev_err(dev, "no PHY found\n");
1021                 return -ENODEV;
1022         }
1023 
1024         SMSC_TRACE(pdata, probe, "PHY: addr %d, phy_id 0x%08X",
1025                    phydev->addr, phydev->phy_id);
1026 
1027         ret = phy_connect_direct(dev, phydev, &smsc911x_phy_adjust_link,
1028                                  pdata->config.phy_interface);
1029 
1030         if (ret) {
1031                 netdev_err(dev, "Could not attach to PHY\n");
1032                 return ret;
1033         }
1034 
1035         netdev_info(dev,
1036                     "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
1037                     phydev->drv->name, dev_name(&phydev->dev), phydev->irq);
1038 
1039         /* mask with MAC supported features */
1040         phydev->supported &= (PHY_BASIC_FEATURES | SUPPORTED_Pause |
1041                               SUPPORTED_Asym_Pause);
1042         phydev->advertising = phydev->supported;
1043 
1044         pdata->phy_dev = phydev;
1045         pdata->last_duplex = -1;
1046         pdata->last_carrier = -1;
1047 
1048 #ifdef USE_PHY_WORK_AROUND
1049         if (smsc911x_phy_loopbacktest(dev) < 0) {
1050                 SMSC_WARN(pdata, hw, "Failed Loop Back Test");
1051                 return -ENODEV;
1052         }
1053         SMSC_TRACE(pdata, hw, "Passed Loop Back Test");
1054 #endif                          /* USE_PHY_WORK_AROUND */
1055 
1056         SMSC_TRACE(pdata, hw, "phy initialised successfully");
1057         return 0;
1058 }
1059 
1060 static int smsc911x_mii_init(struct platform_device *pdev,
1061                              struct net_device *dev)
1062 {
1063         struct smsc911x_data *pdata = netdev_priv(dev);
1064         int err = -ENXIO, i;
1065 
1066         pdata->mii_bus = mdiobus_alloc();
1067         if (!pdata->mii_bus) {
1068                 err = -ENOMEM;
1069                 goto err_out_1;
1070         }
1071 
1072         pdata->mii_bus->name = SMSC_MDIONAME;
1073         snprintf(pdata->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
1074                 pdev->name, pdev->id);
1075         pdata->mii_bus->priv = pdata;
1076         pdata->mii_bus->read = smsc911x_mii_read;
1077         pdata->mii_bus->write = smsc911x_mii_write;
1078         pdata->mii_bus->irq = pdata->phy_irq;
1079         for (i = 0; i < PHY_MAX_ADDR; ++i)
1080                 pdata->mii_bus->irq[i] = PHY_POLL;
1081 
1082         pdata->mii_bus->parent = &pdev->dev;
1083 
1084         switch (pdata->idrev & 0xFFFF0000) {
1085         case 0x01170000:
1086         case 0x01150000:
1087         case 0x117A0000:
1088         case 0x115A0000:
1089                 /* External PHY supported, try to autodetect */
1090                 smsc911x_phy_initialise_external(pdata);
1091                 break;
1092         default:
1093                 SMSC_TRACE(pdata, hw, "External PHY is not supported, "
1094                            "using internal PHY");
1095                 pdata->using_extphy = 0;
1096                 break;
1097         }
1098 
1099         if (!pdata->using_extphy) {
1100                 /* Mask all PHYs except ID 1 (internal) */
1101                 pdata->mii_bus->phy_mask = ~(1 << 1);
1102         }
1103 
1104         if (mdiobus_register(pdata->mii_bus)) {
1105                 SMSC_WARN(pdata, probe, "Error registering mii bus");
1106                 goto err_out_free_bus_2;
1107         }
1108 
1109         if (smsc911x_mii_probe(dev) < 0) {
1110                 SMSC_WARN(pdata, probe, "Error registering mii bus");
1111                 goto err_out_unregister_bus_3;
1112         }
1113 
1114         return 0;
1115 
1116 err_out_unregister_bus_3:
1117         mdiobus_unregister(pdata->mii_bus);
1118 err_out_free_bus_2:
1119         mdiobus_free(pdata->mii_bus);
1120 err_out_1:
1121         return err;
1122 }
1123 
1124 /* Gets the number of tx statuses in the fifo */
1125 static unsigned int smsc911x_tx_get_txstatcount(struct smsc911x_data *pdata)
1126 {
1127         return (smsc911x_reg_read(pdata, TX_FIFO_INF)
1128                 & TX_FIFO_INF_TSUSED_) >> 16;
1129 }
1130 
1131 /* Reads tx statuses and increments counters where necessary */
1132 static void smsc911x_tx_update_txcounters(struct net_device *dev)
1133 {
1134         struct smsc911x_data *pdata = netdev_priv(dev);
1135         unsigned int tx_stat;
1136 
1137         while ((tx_stat = smsc911x_tx_get_txstatus(pdata)) != 0) {
1138                 if (unlikely(tx_stat & 0x80000000)) {
1139                         /* In this driver the packet tag is used as the packet
1140                          * length. Since a packet length can never reach the
1141                          * size of 0x8000, this bit is reserved. It is worth
1142                          * noting that the "reserved bit" in the warning above
1143                          * does not reference a hardware defined reserved bit
1144                          * but rather a driver defined one.
1145                          */
1146                         SMSC_WARN(pdata, hw, "Packet tag reserved bit is high");
1147                 } else {
1148                         if (unlikely(tx_stat & TX_STS_ES_)) {
1149                                 dev->stats.tx_errors++;
1150                         } else {
1151                                 dev->stats.tx_packets++;
1152                                 dev->stats.tx_bytes += (tx_stat >> 16);
1153                         }
1154                         if (unlikely(tx_stat & TX_STS_EXCESS_COL_)) {
1155                                 dev->stats.collisions += 16;
1156                                 dev->stats.tx_aborted_errors += 1;
1157                         } else {
1158                                 dev->stats.collisions +=
1159                                     ((tx_stat >> 3) & 0xF);
1160                         }
1161                         if (unlikely(tx_stat & TX_STS_LOST_CARRIER_))
1162                                 dev->stats.tx_carrier_errors += 1;
1163                         if (unlikely(tx_stat & TX_STS_LATE_COL_)) {
1164                                 dev->stats.collisions++;
1165                                 dev->stats.tx_aborted_errors++;
1166                         }
1167                 }
1168         }
1169 }
1170 
1171 /* Increments the Rx error counters */
1172 static void
1173 smsc911x_rx_counterrors(struct net_device *dev, unsigned int rxstat)
1174 {
1175         int crc_err = 0;
1176 
1177         if (unlikely(rxstat & RX_STS_ES_)) {
1178                 dev->stats.rx_errors++;
1179                 if (unlikely(rxstat & RX_STS_CRC_ERR_)) {
1180                         dev->stats.rx_crc_errors++;
1181                         crc_err = 1;
1182                 }
1183         }
1184         if (likely(!crc_err)) {
1185                 if (unlikely((rxstat & RX_STS_FRAME_TYPE_) &&
1186                              (rxstat & RX_STS_LENGTH_ERR_)))
1187                         dev->stats.rx_length_errors++;
1188                 if (rxstat & RX_STS_MCAST_)
1189                         dev->stats.multicast++;
1190         }
1191 }
1192 
1193 /* Quickly dumps bad packets */
1194 static void
1195 smsc911x_rx_fastforward(struct smsc911x_data *pdata, unsigned int pktwords)
1196 {
1197         if (likely(pktwords >= 4)) {
1198                 unsigned int timeout = 500;
1199                 unsigned int val;
1200                 smsc911x_reg_write(pdata, RX_DP_CTRL, RX_DP_CTRL_RX_FFWD_);
1201                 do {
1202                         udelay(1);
1203                         val = smsc911x_reg_read(pdata, RX_DP_CTRL);
1204                 } while ((val & RX_DP_CTRL_RX_FFWD_) && --timeout);
1205 
1206                 if (unlikely(timeout == 0))
1207                         SMSC_WARN(pdata, hw, "Timed out waiting for "
1208                                   "RX FFWD to finish, RX_DP_CTRL: 0x%08X", val);
1209         } else {
1210                 unsigned int temp;
1211                 while (pktwords--)
1212                         temp = smsc911x_reg_read(pdata, RX_DATA_FIFO);
1213         }
1214 }
1215 
1216 /* NAPI poll function */
1217 static int smsc911x_poll(struct napi_struct *napi, int budget)
1218 {
1219         struct smsc911x_data *pdata =
1220                 container_of(napi, struct smsc911x_data, napi);
1221         struct net_device *dev = pdata->dev;
1222         int npackets = 0;
1223 
1224         while (npackets < budget) {
1225                 unsigned int pktlength;
1226                 unsigned int pktwords;
1227                 struct sk_buff *skb;
1228                 unsigned int rxstat = smsc911x_rx_get_rxstatus(pdata);
1229 
1230                 if (!rxstat) {
1231                         unsigned int temp;
1232                         /* We processed all packets available.  Tell NAPI it can
1233                          * stop polling then re-enable rx interrupts */
1234                         smsc911x_reg_write(pdata, INT_STS, INT_STS_RSFL_);
1235                         napi_complete(napi);
1236                         temp = smsc911x_reg_read(pdata, INT_EN);
1237                         temp |= INT_EN_RSFL_EN_;
1238                         smsc911x_reg_write(pdata, INT_EN, temp);
1239                         break;
1240                 }
1241 
1242                 /* Count packet for NAPI scheduling, even if it has an error.
1243                  * Error packets still require cycles to discard */
1244                 npackets++;
1245 
1246                 pktlength = ((rxstat & 0x3FFF0000) >> 16);
1247                 pktwords = (pktlength + NET_IP_ALIGN + 3) >> 2;
1248                 smsc911x_rx_counterrors(dev, rxstat);
1249 
1250                 if (unlikely(rxstat & RX_STS_ES_)) {
1251                         SMSC_WARN(pdata, rx_err,
1252                                   "Discarding packet with error bit set");
1253                         /* Packet has an error, discard it and continue with
1254                          * the next */
1255                         smsc911x_rx_fastforward(pdata, pktwords);
1256                         dev->stats.rx_dropped++;
1257                         continue;
1258                 }
1259 
1260                 skb = netdev_alloc_skb(dev, pktwords << 2);
1261                 if (unlikely(!skb)) {
1262                         SMSC_WARN(pdata, rx_err,
1263                                   "Unable to allocate skb for rx packet");
1264                         /* Drop the packet and stop this polling iteration */
1265                         smsc911x_rx_fastforward(pdata, pktwords);
1266                         dev->stats.rx_dropped++;
1267                         break;
1268                 }
1269 
1270                 pdata->ops->rx_readfifo(pdata,
1271                                  (unsigned int *)skb->data, pktwords);
1272 
1273                 /* Align IP on 16B boundary */
1274                 skb_reserve(skb, NET_IP_ALIGN);
1275                 skb_put(skb, pktlength - 4);
1276                 skb->protocol = eth_type_trans(skb, dev);
1277                 skb_checksum_none_assert(skb);
1278                 netif_receive_skb(skb);
1279 
1280                 /* Update counters */
1281                 dev->stats.rx_packets++;
1282                 dev->stats.rx_bytes += (pktlength - 4);
1283         }
1284 
1285         /* Return total received packets */
1286         return npackets;
1287 }
1288 
1289 /* Returns hash bit number for given MAC address
1290  * Example:
1291  * 01 00 5E 00 00 01 -> returns bit number 31 */
1292 static unsigned int smsc911x_hash(char addr[ETH_ALEN])
1293 {
1294         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
1295 }
1296 
1297 static void smsc911x_rx_multicast_update(struct smsc911x_data *pdata)
1298 {
1299         /* Performs the multicast & mac_cr update.  This is called when
1300          * safe on the current hardware, and with the mac_lock held */
1301         unsigned int mac_cr;
1302 
1303         SMSC_ASSERT_MAC_LOCK(pdata);
1304 
1305         mac_cr = smsc911x_mac_read(pdata, MAC_CR);
1306         mac_cr |= pdata->set_bits_mask;
1307         mac_cr &= ~(pdata->clear_bits_mask);
1308         smsc911x_mac_write(pdata, MAC_CR, mac_cr);
1309         smsc911x_mac_write(pdata, HASHH, pdata->hashhi);
1310         smsc911x_mac_write(pdata, HASHL, pdata->hashlo);
1311         SMSC_TRACE(pdata, hw, "maccr 0x%08X, HASHH 0x%08X, HASHL 0x%08X",
1312                    mac_cr, pdata->hashhi, pdata->hashlo);
1313 }
1314 
1315 static void smsc911x_rx_multicast_update_workaround(struct smsc911x_data *pdata)
1316 {
1317         unsigned int mac_cr;
1318 
1319         /* This function is only called for older LAN911x devices
1320          * (revA or revB), where MAC_CR, HASHH and HASHL should not
1321          * be modified during Rx - newer devices immediately update the
1322          * registers.
1323          *
1324          * This is called from interrupt context */
1325 
1326         spin_lock(&pdata->mac_lock);
1327 
1328         /* Check Rx has stopped */
1329         if (smsc911x_mac_read(pdata, MAC_CR) & MAC_CR_RXEN_)
1330                 SMSC_WARN(pdata, drv, "Rx not stopped");
1331 
1332         /* Perform the update - safe to do now Rx has stopped */
1333         smsc911x_rx_multicast_update(pdata);
1334 
1335         /* Re-enable Rx */
1336         mac_cr = smsc911x_mac_read(pdata, MAC_CR);
1337         mac_cr |= MAC_CR_RXEN_;
1338         smsc911x_mac_write(pdata, MAC_CR, mac_cr);
1339 
1340         pdata->multicast_update_pending = 0;
1341 
1342         spin_unlock(&pdata->mac_lock);
1343 }
1344 
1345 static int smsc911x_phy_disable_energy_detect(struct smsc911x_data *pdata)
1346 {
1347         int rc = 0;
1348 
1349         if (!pdata->phy_dev)
1350                 return rc;
1351 
1352         rc = phy_read(pdata->phy_dev, MII_LAN83C185_CTRL_STATUS);
1353 
1354         if (rc < 0) {
1355                 SMSC_WARN(pdata, drv, "Failed reading PHY control reg");
1356                 return rc;
1357         }
1358 
1359         /*
1360          * If energy is detected the PHY is already awake so is not necessary
1361          * to disable the energy detect power-down mode.
1362          */
1363         if ((rc & MII_LAN83C185_EDPWRDOWN) &&
1364             !(rc & MII_LAN83C185_ENERGYON)) {
1365                 /* Disable energy detect mode for this SMSC Transceivers */
1366                 rc = phy_write(pdata->phy_dev, MII_LAN83C185_CTRL_STATUS,
1367                                rc & (~MII_LAN83C185_EDPWRDOWN));
1368 
1369                 if (rc < 0) {
1370                         SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
1371                         return rc;
1372                 }
1373 
1374                 mdelay(1);
1375         }
1376 
1377         return 0;
1378 }
1379 
1380 static int smsc911x_phy_enable_energy_detect(struct smsc911x_data *pdata)
1381 {
1382         int rc = 0;
1383 
1384         if (!pdata->phy_dev)
1385                 return rc;
1386 
1387         rc = phy_read(pdata->phy_dev, MII_LAN83C185_CTRL_STATUS);
1388 
1389         if (rc < 0) {
1390                 SMSC_WARN(pdata, drv, "Failed reading PHY control reg");
1391                 return rc;
1392         }
1393 
1394         /* Only enable if energy detect mode is already disabled */
1395         if (!(rc & MII_LAN83C185_EDPWRDOWN)) {
1396                 mdelay(100);
1397                 /* Enable energy detect mode for this SMSC Transceivers */
1398                 rc = phy_write(pdata->phy_dev, MII_LAN83C185_CTRL_STATUS,
1399                                rc | MII_LAN83C185_EDPWRDOWN);
1400 
1401                 if (rc < 0) {
1402                         SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
1403                         return rc;
1404                 }
1405 
1406                 mdelay(1);
1407         }
1408         return 0;
1409 }
1410 
1411 static int smsc911x_soft_reset(struct smsc911x_data *pdata)
1412 {
1413         unsigned int timeout;
1414         unsigned int temp;
1415         int ret;
1416 
1417         /*
1418          * LAN9210/LAN9211/LAN9220/LAN9221 chips have an internal PHY that
1419          * are initialized in a Energy Detect Power-Down mode that prevents
1420          * the MAC chip to be software reseted. So we have to wakeup the PHY
1421          * before.
1422          */
1423         if (pdata->generation == 4) {
1424                 ret = smsc911x_phy_disable_energy_detect(pdata);
1425 
1426                 if (ret) {
1427                         SMSC_WARN(pdata, drv, "Failed to wakeup the PHY chip");
1428                         return ret;
1429                 }
1430         }
1431 
1432         /* Reset the LAN911x */
1433         smsc911x_reg_write(pdata, HW_CFG, HW_CFG_SRST_);
1434         timeout = 10;
1435         do {
1436                 udelay(10);
1437                 temp = smsc911x_reg_read(pdata, HW_CFG);
1438         } while ((--timeout) && (temp & HW_CFG_SRST_));
1439 
1440         if (unlikely(temp & HW_CFG_SRST_)) {
1441                 SMSC_WARN(pdata, drv, "Failed to complete reset");
1442                 return -EIO;
1443         }
1444 
1445         if (pdata->generation == 4) {
1446                 ret = smsc911x_phy_enable_energy_detect(pdata);
1447 
1448                 if (ret) {
1449                         SMSC_WARN(pdata, drv, "Failed to wakeup the PHY chip");
1450                         return ret;
1451                 }
1452         }
1453 
1454         return 0;
1455 }
1456 
1457 /* Sets the device MAC address to dev_addr, called with mac_lock held */
1458 static void
1459 smsc911x_set_hw_mac_address(struct smsc911x_data *pdata, u8 dev_addr[6])
1460 {
1461         u32 mac_high16 = (dev_addr[5] << 8) | dev_addr[4];
1462         u32 mac_low32 = (dev_addr[3] << 24) | (dev_addr[2] << 16) |
1463             (dev_addr[1] << 8) | dev_addr[0];
1464 
1465         SMSC_ASSERT_MAC_LOCK(pdata);
1466 
1467         smsc911x_mac_write(pdata, ADDRH, mac_high16);
1468         smsc911x_mac_write(pdata, ADDRL, mac_low32);
1469 }
1470 
1471 static void smsc911x_disable_irq_chip(struct net_device *dev)
1472 {
1473         struct smsc911x_data *pdata = netdev_priv(dev);
1474 
1475         smsc911x_reg_write(pdata, INT_EN, 0);
1476         smsc911x_reg_write(pdata, INT_STS, 0xFFFFFFFF);
1477 }
1478 
1479 static int smsc911x_open(struct net_device *dev)
1480 {
1481         struct smsc911x_data *pdata = netdev_priv(dev);
1482         unsigned int timeout;
1483         unsigned int temp;
1484         unsigned int intcfg;
1485 
1486         /* if the phy is not yet registered, retry later*/
1487         if (!pdata->phy_dev) {
1488                 SMSC_WARN(pdata, hw, "phy_dev is NULL");
1489                 return -EAGAIN;
1490         }
1491 
1492         /* Reset the LAN911x */
1493         if (smsc911x_soft_reset(pdata)) {
1494                 SMSC_WARN(pdata, hw, "soft reset failed");
1495                 return -EIO;
1496         }
1497 
1498         smsc911x_reg_write(pdata, HW_CFG, 0x00050000);
1499         smsc911x_reg_write(pdata, AFC_CFG, 0x006E3740);
1500 
1501         /* Increase the legal frame size of VLAN tagged frames to 1522 bytes */
1502         spin_lock_irq(&pdata->mac_lock);
1503         smsc911x_mac_write(pdata, VLAN1, ETH_P_8021Q);
1504         spin_unlock_irq(&pdata->mac_lock);
1505 
1506         /* Make sure EEPROM has finished loading before setting GPIO_CFG */
1507         timeout = 50;
1508         while ((smsc911x_reg_read(pdata, E2P_CMD) & E2P_CMD_EPC_BUSY_) &&
1509                --timeout) {
1510                 udelay(10);
1511         }
1512 
1513         if (unlikely(timeout == 0))
1514                 SMSC_WARN(pdata, ifup,
1515                           "Timed out waiting for EEPROM busy bit to clear");
1516 
1517         smsc911x_reg_write(pdata, GPIO_CFG, 0x70070000);
1518 
1519         /* The soft reset above cleared the device's MAC address,
1520          * restore it from local copy (set in probe) */
1521         spin_lock_irq(&pdata->mac_lock);
1522         smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
1523         spin_unlock_irq(&pdata->mac_lock);
1524 
1525         /* Initialise irqs, but leave all sources disabled */
1526         smsc911x_disable_irq_chip(dev);
1527 
1528         /* Set interrupt deassertion to 100uS */
1529         intcfg = ((10 << 24) | INT_CFG_IRQ_EN_);
1530 
1531         if (pdata->config.irq_polarity) {
1532                 SMSC_TRACE(pdata, ifup, "irq polarity: active high");
1533                 intcfg |= INT_CFG_IRQ_POL_;
1534         } else {
1535                 SMSC_TRACE(pdata, ifup, "irq polarity: active low");
1536         }
1537 
1538         if (pdata->config.irq_type) {
1539                 SMSC_TRACE(pdata, ifup, "irq type: push-pull");
1540                 intcfg |= INT_CFG_IRQ_TYPE_;
1541         } else {
1542                 SMSC_TRACE(pdata, ifup, "irq type: open drain");
1543         }
1544 
1545         smsc911x_reg_write(pdata, INT_CFG, intcfg);
1546 
1547         SMSC_TRACE(pdata, ifup, "Testing irq handler using IRQ %d", dev->irq);
1548         pdata->software_irq_signal = 0;
1549         smp_wmb();
1550 
1551         temp = smsc911x_reg_read(pdata, INT_EN);
1552         temp |= INT_EN_SW_INT_EN_;
1553         smsc911x_reg_write(pdata, INT_EN, temp);
1554 
1555         timeout = 1000;
1556         while (timeout--) {
1557                 if (pdata->software_irq_signal)
1558                         break;
1559                 msleep(1);
1560         }
1561 
1562         if (!pdata->software_irq_signal) {
1563                 netdev_warn(dev, "ISR failed signaling test (IRQ %d)\n",
1564                             dev->irq);
1565                 return -ENODEV;
1566         }
1567         SMSC_TRACE(pdata, ifup, "IRQ handler passed test using IRQ %d",
1568                    dev->irq);
1569 
1570         netdev_info(dev, "SMSC911x/921x identified at %#08lx, IRQ: %d\n",
1571                     (unsigned long)pdata->ioaddr, dev->irq);
1572 
1573         /* Reset the last known duplex and carrier */
1574         pdata->last_duplex = -1;
1575         pdata->last_carrier = -1;
1576 
1577         /* Bring the PHY up */
1578         phy_start(pdata->phy_dev);
1579 
1580         temp = smsc911x_reg_read(pdata, HW_CFG);
1581         /* Preserve TX FIFO size and external PHY configuration */
1582         temp &= (HW_CFG_TX_FIF_SZ_|0x00000FFF);
1583         temp |= HW_CFG_SF_;
1584         smsc911x_reg_write(pdata, HW_CFG, temp);
1585 
1586         temp = smsc911x_reg_read(pdata, FIFO_INT);
1587         temp |= FIFO_INT_TX_AVAIL_LEVEL_;
1588         temp &= ~(FIFO_INT_RX_STS_LEVEL_);
1589         smsc911x_reg_write(pdata, FIFO_INT, temp);
1590 
1591         /* set RX Data offset to 2 bytes for alignment */
1592         smsc911x_reg_write(pdata, RX_CFG, (NET_IP_ALIGN << 8));
1593 
1594         /* enable NAPI polling before enabling RX interrupts */
1595         napi_enable(&pdata->napi);
1596 
1597         temp = smsc911x_reg_read(pdata, INT_EN);
1598         temp |= (INT_EN_TDFA_EN_ | INT_EN_RSFL_EN_ | INT_EN_RXSTOP_INT_EN_);
1599         smsc911x_reg_write(pdata, INT_EN, temp);
1600 
1601         spin_lock_irq(&pdata->mac_lock);
1602         temp = smsc911x_mac_read(pdata, MAC_CR);
1603         temp |= (MAC_CR_TXEN_ | MAC_CR_RXEN_ | MAC_CR_HBDIS_);
1604         smsc911x_mac_write(pdata, MAC_CR, temp);
1605         spin_unlock_irq(&pdata->mac_lock);
1606 
1607         smsc911x_reg_write(pdata, TX_CFG, TX_CFG_TX_ON_);
1608 
1609         netif_start_queue(dev);
1610         return 0;
1611 }
1612 
1613 /* Entry point for stopping the interface */
1614 static int smsc911x_stop(struct net_device *dev)
1615 {
1616         struct smsc911x_data *pdata = netdev_priv(dev);
1617         unsigned int temp;
1618 
1619         /* Disable all device interrupts */
1620         temp = smsc911x_reg_read(pdata, INT_CFG);
1621         temp &= ~INT_CFG_IRQ_EN_;
1622         smsc911x_reg_write(pdata, INT_CFG, temp);
1623 
1624         /* Stop Tx and Rx polling */
1625         netif_stop_queue(dev);
1626         napi_disable(&pdata->napi);
1627 
1628         /* At this point all Rx and Tx activity is stopped */
1629         dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
1630         smsc911x_tx_update_txcounters(dev);
1631 
1632         /* Bring the PHY down */
1633         if (pdata->phy_dev)
1634                 phy_stop(pdata->phy_dev);
1635 
1636         SMSC_TRACE(pdata, ifdown, "Interface stopped");
1637         return 0;
1638 }
1639 
1640 /* Entry point for transmitting a packet */
1641 static int smsc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1642 {
1643         struct smsc911x_data *pdata = netdev_priv(dev);
1644         unsigned int freespace;
1645         unsigned int tx_cmd_a;
1646         unsigned int tx_cmd_b;
1647         unsigned int temp;
1648         u32 wrsz;
1649         ulong bufp;
1650 
1651         freespace = smsc911x_reg_read(pdata, TX_FIFO_INF) & TX_FIFO_INF_TDFREE_;
1652 
1653         if (unlikely(freespace < TX_FIFO_LOW_THRESHOLD))
1654                 SMSC_WARN(pdata, tx_err,
1655                           "Tx data fifo low, space available: %d", freespace);
1656 
1657         /* Word alignment adjustment */
1658         tx_cmd_a = (u32)((ulong)skb->data & 0x03) << 16;
1659         tx_cmd_a |= TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1660         tx_cmd_a |= (unsigned int)skb->len;
1661 
1662         tx_cmd_b = ((unsigned int)skb->len) << 16;
1663         tx_cmd_b |= (unsigned int)skb->len;
1664 
1665         smsc911x_reg_write(pdata, TX_DATA_FIFO, tx_cmd_a);
1666         smsc911x_reg_write(pdata, TX_DATA_FIFO, tx_cmd_b);
1667 
1668         bufp = (ulong)skb->data & (~0x3);
1669         wrsz = (u32)skb->len + 3;
1670         wrsz += (u32)((ulong)skb->data & 0x3);
1671         wrsz >>= 2;
1672 
1673         pdata->ops->tx_writefifo(pdata, (unsigned int *)bufp, wrsz);
1674         freespace -= (skb->len + 32);
1675         skb_tx_timestamp(skb);
1676         dev_consume_skb_any(skb);
1677 
1678         if (unlikely(smsc911x_tx_get_txstatcount(pdata) >= 30))
1679                 smsc911x_tx_update_txcounters(dev);
1680 
1681         if (freespace < TX_FIFO_LOW_THRESHOLD) {
1682                 netif_stop_queue(dev);
1683                 temp = smsc911x_reg_read(pdata, FIFO_INT);
1684                 temp &= 0x00FFFFFF;
1685                 temp |= 0x32000000;
1686                 smsc911x_reg_write(pdata, FIFO_INT, temp);
1687         }
1688 
1689         return NETDEV_TX_OK;
1690 }
1691 
1692 /* Entry point for getting status counters */
1693 static struct net_device_stats *smsc911x_get_stats(struct net_device *dev)
1694 {
1695         struct smsc911x_data *pdata = netdev_priv(dev);
1696         smsc911x_tx_update_txcounters(dev);
1697         dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
1698         return &dev->stats;
1699 }
1700 
1701 /* Entry point for setting addressing modes */
1702 static void smsc911x_set_multicast_list(struct net_device *dev)
1703 {
1704         struct smsc911x_data *pdata = netdev_priv(dev);
1705         unsigned long flags;
1706 
1707         if (dev->flags & IFF_PROMISC) {
1708                 /* Enabling promiscuous mode */
1709                 pdata->set_bits_mask = MAC_CR_PRMS_;
1710                 pdata->clear_bits_mask = (MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
1711                 pdata->hashhi = 0;
1712                 pdata->hashlo = 0;
1713         } else if (dev->flags & IFF_ALLMULTI) {
1714                 /* Enabling all multicast mode */
1715                 pdata->set_bits_mask = MAC_CR_MCPAS_;
1716                 pdata->clear_bits_mask = (MAC_CR_PRMS_ | MAC_CR_HPFILT_);
1717                 pdata->hashhi = 0;
1718                 pdata->hashlo = 0;
1719         } else if (!netdev_mc_empty(dev)) {
1720                 /* Enabling specific multicast addresses */
1721                 unsigned int hash_high = 0;
1722                 unsigned int hash_low = 0;
1723                 struct netdev_hw_addr *ha;
1724 
1725                 pdata->set_bits_mask = MAC_CR_HPFILT_;
1726                 pdata->clear_bits_mask = (MAC_CR_PRMS_ | MAC_CR_MCPAS_);
1727 
1728                 netdev_for_each_mc_addr(ha, dev) {
1729                         unsigned int bitnum = smsc911x_hash(ha->addr);
1730                         unsigned int mask = 0x01 << (bitnum & 0x1F);
1731 
1732                         if (bitnum & 0x20)
1733                                 hash_high |= mask;
1734                         else
1735                                 hash_low |= mask;
1736                 }
1737 
1738                 pdata->hashhi = hash_high;
1739                 pdata->hashlo = hash_low;
1740         } else {
1741                 /* Enabling local MAC address only */
1742                 pdata->set_bits_mask = 0;
1743                 pdata->clear_bits_mask =
1744                     (MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
1745                 pdata->hashhi = 0;
1746                 pdata->hashlo = 0;
1747         }
1748 
1749         spin_lock_irqsave(&pdata->mac_lock, flags);
1750 
1751         if (pdata->generation <= 1) {
1752                 /* Older hardware revision - cannot change these flags while
1753                  * receiving data */
1754                 if (!pdata->multicast_update_pending) {
1755                         unsigned int temp;
1756                         SMSC_TRACE(pdata, hw, "scheduling mcast update");
1757                         pdata->multicast_update_pending = 1;
1758 
1759                         /* Request the hardware to stop, then perform the
1760                          * update when we get an RX_STOP interrupt */
1761                         temp = smsc911x_mac_read(pdata, MAC_CR);
1762                         temp &= ~(MAC_CR_RXEN_);
1763                         smsc911x_mac_write(pdata, MAC_CR, temp);
1764                 } else {
1765                         /* There is another update pending, this should now
1766                          * use the newer values */
1767                 }
1768         } else {
1769                 /* Newer hardware revision - can write immediately */
1770                 smsc911x_rx_multicast_update(pdata);
1771         }
1772 
1773         spin_unlock_irqrestore(&pdata->mac_lock, flags);
1774 }
1775 
1776 static irqreturn_t smsc911x_irqhandler(int irq, void *dev_id)
1777 {
1778         struct net_device *dev = dev_id;
1779         struct smsc911x_data *pdata = netdev_priv(dev);
1780         u32 intsts = smsc911x_reg_read(pdata, INT_STS);
1781         u32 inten = smsc911x_reg_read(pdata, INT_EN);
1782         int serviced = IRQ_NONE;
1783         u32 temp;
1784 
1785         if (unlikely(intsts & inten & INT_STS_SW_INT_)) {
1786                 temp = smsc911x_reg_read(pdata, INT_EN);
1787                 temp &= (~INT_EN_SW_INT_EN_);
1788                 smsc911x_reg_write(pdata, INT_EN, temp);
1789                 smsc911x_reg_write(pdata, INT_STS, INT_STS_SW_INT_);
1790                 pdata->software_irq_signal = 1;
1791                 smp_wmb();
1792                 serviced = IRQ_HANDLED;
1793         }
1794 
1795         if (unlikely(intsts & inten & INT_STS_RXSTOP_INT_)) {
1796                 /* Called when there is a multicast update scheduled and
1797                  * it is now safe to complete the update */
1798                 SMSC_TRACE(pdata, intr, "RX Stop interrupt");
1799                 smsc911x_reg_write(pdata, INT_STS, INT_STS_RXSTOP_INT_);
1800                 if (pdata->multicast_update_pending)
1801                         smsc911x_rx_multicast_update_workaround(pdata);
1802                 serviced = IRQ_HANDLED;
1803         }
1804 
1805         if (intsts & inten & INT_STS_TDFA_) {
1806                 temp = smsc911x_reg_read(pdata, FIFO_INT);
1807                 temp |= FIFO_INT_TX_AVAIL_LEVEL_;
1808                 smsc911x_reg_write(pdata, FIFO_INT, temp);
1809                 smsc911x_reg_write(pdata, INT_STS, INT_STS_TDFA_);
1810                 netif_wake_queue(dev);
1811                 serviced = IRQ_HANDLED;
1812         }
1813 
1814         if (unlikely(intsts & inten & INT_STS_RXE_)) {
1815                 SMSC_TRACE(pdata, intr, "RX Error interrupt");
1816                 smsc911x_reg_write(pdata, INT_STS, INT_STS_RXE_);
1817                 serviced = IRQ_HANDLED;
1818         }
1819 
1820         if (likely(intsts & inten & INT_STS_RSFL_)) {
1821                 if (likely(napi_schedule_prep(&pdata->napi))) {
1822                         /* Disable Rx interrupts */
1823                         temp = smsc911x_reg_read(pdata, INT_EN);
1824                         temp &= (~INT_EN_RSFL_EN_);
1825                         smsc911x_reg_write(pdata, INT_EN, temp);
1826                         /* Schedule a NAPI poll */
1827                         __napi_schedule(&pdata->napi);
1828                 } else {
1829                         SMSC_WARN(pdata, rx_err, "napi_schedule_prep failed");
1830                 }
1831                 serviced = IRQ_HANDLED;
1832         }
1833 
1834         return serviced;
1835 }
1836 
1837 #ifdef CONFIG_NET_POLL_CONTROLLER
1838 static void smsc911x_poll_controller(struct net_device *dev)
1839 {
1840         disable_irq(dev->irq);
1841         smsc911x_irqhandler(0, dev);
1842         enable_irq(dev->irq);
1843 }
1844 #endif                          /* CONFIG_NET_POLL_CONTROLLER */
1845 
1846 static int smsc911x_set_mac_address(struct net_device *dev, void *p)
1847 {
1848         struct smsc911x_data *pdata = netdev_priv(dev);
1849         struct sockaddr *addr = p;
1850 
1851         /* On older hardware revisions we cannot change the mac address
1852          * registers while receiving data.  Newer devices can safely change
1853          * this at any time. */
1854         if (pdata->generation <= 1 && netif_running(dev))
1855                 return -EBUSY;
1856 
1857         if (!is_valid_ether_addr(addr->sa_data))
1858                 return -EADDRNOTAVAIL;
1859 
1860         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
1861 
1862         spin_lock_irq(&pdata->mac_lock);
1863         smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
1864         spin_unlock_irq(&pdata->mac_lock);
1865 
1866         netdev_info(dev, "MAC Address: %pM\n", dev->dev_addr);
1867 
1868         return 0;
1869 }
1870 
1871 /* Standard ioctls for mii-tool */
1872 static int smsc911x_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1873 {
1874         struct smsc911x_data *pdata = netdev_priv(dev);
1875 
1876         if (!netif_running(dev) || !pdata->phy_dev)
1877                 return -EINVAL;
1878 
1879         return phy_mii_ioctl(pdata->phy_dev, ifr, cmd);
1880 }
1881 
1882 static int
1883 smsc911x_ethtool_getsettings(struct net_device *dev, struct ethtool_cmd *cmd)
1884 {
1885         struct smsc911x_data *pdata = netdev_priv(dev);
1886 
1887         cmd->maxtxpkt = 1;
1888         cmd->maxrxpkt = 1;
1889         return phy_ethtool_gset(pdata->phy_dev, cmd);
1890 }
1891 
1892 static int
1893 smsc911x_ethtool_setsettings(struct net_device *dev, struct ethtool_cmd *cmd)
1894 {
1895         struct smsc911x_data *pdata = netdev_priv(dev);
1896 
1897         return phy_ethtool_sset(pdata->phy_dev, cmd);
1898 }
1899 
1900 static void smsc911x_ethtool_getdrvinfo(struct net_device *dev,
1901                                         struct ethtool_drvinfo *info)
1902 {
1903         strlcpy(info->driver, SMSC_CHIPNAME, sizeof(info->driver));
1904         strlcpy(info->version, SMSC_DRV_VERSION, sizeof(info->version));
1905         strlcpy(info->bus_info, dev_name(dev->dev.parent),
1906                 sizeof(info->bus_info));
1907 }
1908 
1909 static int smsc911x_ethtool_nwayreset(struct net_device *dev)
1910 {
1911         struct smsc911x_data *pdata = netdev_priv(dev);
1912 
1913         return phy_start_aneg(pdata->phy_dev);
1914 }
1915 
1916 static u32 smsc911x_ethtool_getmsglevel(struct net_device *dev)
1917 {
1918         struct smsc911x_data *pdata = netdev_priv(dev);
1919         return pdata->msg_enable;
1920 }
1921 
1922 static void smsc911x_ethtool_setmsglevel(struct net_device *dev, u32 level)
1923 {
1924         struct smsc911x_data *pdata = netdev_priv(dev);
1925         pdata->msg_enable = level;
1926 }
1927 
1928 static int smsc911x_ethtool_getregslen(struct net_device *dev)
1929 {
1930         return (((E2P_DATA - ID_REV) / 4 + 1) + (WUCSR - MAC_CR) + 1 + 32) *
1931             sizeof(u32);
1932 }
1933 
1934 static void
1935 smsc911x_ethtool_getregs(struct net_device *dev, struct ethtool_regs *regs,
1936                          void *buf)
1937 {
1938         struct smsc911x_data *pdata = netdev_priv(dev);
1939         struct phy_device *phy_dev = pdata->phy_dev;
1940         unsigned long flags;
1941         unsigned int i;
1942         unsigned int j = 0;
1943         u32 *data = buf;
1944 
1945         regs->version = pdata->idrev;
1946         for (i = ID_REV; i <= E2P_DATA; i += (sizeof(u32)))
1947                 data[j++] = smsc911x_reg_read(pdata, i);
1948 
1949         for (i = MAC_CR; i <= WUCSR; i++) {
1950                 spin_lock_irqsave(&pdata->mac_lock, flags);
1951                 data[j++] = smsc911x_mac_read(pdata, i);
1952                 spin_unlock_irqrestore(&pdata->mac_lock, flags);
1953         }
1954 
1955         for (i = 0; i <= 31; i++)
1956                 data[j++] = smsc911x_mii_read(phy_dev->bus, phy_dev->addr, i);
1957 }
1958 
1959 static void smsc911x_eeprom_enable_access(struct smsc911x_data *pdata)
1960 {
1961         unsigned int temp = smsc911x_reg_read(pdata, GPIO_CFG);
1962         temp &= ~GPIO_CFG_EEPR_EN_;
1963         smsc911x_reg_write(pdata, GPIO_CFG, temp);
1964         msleep(1);
1965 }
1966 
1967 static int smsc911x_eeprom_send_cmd(struct smsc911x_data *pdata, u32 op)
1968 {
1969         int timeout = 100;
1970         u32 e2cmd;
1971 
1972         SMSC_TRACE(pdata, drv, "op 0x%08x", op);
1973         if (smsc911x_reg_read(pdata, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
1974                 SMSC_WARN(pdata, drv, "Busy at start");
1975                 return -EBUSY;
1976         }
1977 
1978         e2cmd = op | E2P_CMD_EPC_BUSY_;
1979         smsc911x_reg_write(pdata, E2P_CMD, e2cmd);
1980 
1981         do {
1982                 msleep(1);
1983                 e2cmd = smsc911x_reg_read(pdata, E2P_CMD);
1984         } while ((e2cmd & E2P_CMD_EPC_BUSY_) && (--timeout));
1985 
1986         if (!timeout) {
1987                 SMSC_TRACE(pdata, drv, "TIMED OUT");
1988                 return -EAGAIN;
1989         }
1990 
1991         if (e2cmd & E2P_CMD_EPC_TIMEOUT_) {
1992                 SMSC_TRACE(pdata, drv, "Error occurred during eeprom operation");
1993                 return -EINVAL;
1994         }
1995 
1996         return 0;
1997 }
1998 
1999 static int smsc911x_eeprom_read_location(struct smsc911x_data *pdata,
2000                                          u8 address, u8 *data)
2001 {
2002         u32 op = E2P_CMD_EPC_CMD_READ_ | address;
2003         int ret;
2004 
2005         SMSC_TRACE(pdata, drv, "address 0x%x", address);
2006         ret = smsc911x_eeprom_send_cmd(pdata, op);
2007 
2008         if (!ret)
2009                 data[address] = smsc911x_reg_read(pdata, E2P_DATA);
2010 
2011         return ret;
2012 }
2013 
2014 static int smsc911x_eeprom_write_location(struct smsc911x_data *pdata,
2015                                           u8 address, u8 data)
2016 {
2017         u32 op = E2P_CMD_EPC_CMD_ERASE_ | address;
2018         u32 temp;
2019         int ret;
2020 
2021         SMSC_TRACE(pdata, drv, "address 0x%x, data 0x%x", address, data);
2022         ret = smsc911x_eeprom_send_cmd(pdata, op);
2023 
2024         if (!ret) {
2025                 op = E2P_CMD_EPC_CMD_WRITE_ | address;
2026                 smsc911x_reg_write(pdata, E2P_DATA, (u32)data);
2027 
2028                 /* Workaround for hardware read-after-write restriction */
2029                 temp = smsc911x_reg_read(pdata, BYTE_TEST);
2030 
2031                 ret = smsc911x_eeprom_send_cmd(pdata, op);
2032         }
2033 
2034         return ret;
2035 }
2036 
2037 static int smsc911x_ethtool_get_eeprom_len(struct net_device *dev)
2038 {
2039         return SMSC911X_EEPROM_SIZE;
2040 }
2041 
2042 static int smsc911x_ethtool_get_eeprom(struct net_device *dev,
2043                                        struct ethtool_eeprom *eeprom, u8 *data)
2044 {
2045         struct smsc911x_data *pdata = netdev_priv(dev);
2046         u8 eeprom_data[SMSC911X_EEPROM_SIZE];
2047         int len;
2048         int i;
2049 
2050         smsc911x_eeprom_enable_access(pdata);
2051 
2052         len = min(eeprom->len, SMSC911X_EEPROM_SIZE);
2053         for (i = 0; i < len; i++) {
2054                 int ret = smsc911x_eeprom_read_location(pdata, i, eeprom_data);
2055                 if (ret < 0) {
2056                         eeprom->len = 0;
2057                         return ret;
2058                 }
2059         }
2060 
2061         memcpy(data, &eeprom_data[eeprom->offset], len);
2062         eeprom->len = len;
2063         return 0;
2064 }
2065 
2066 static int smsc911x_ethtool_set_eeprom(struct net_device *dev,
2067                                        struct ethtool_eeprom *eeprom, u8 *data)
2068 {
2069         int ret;
2070         struct smsc911x_data *pdata = netdev_priv(dev);
2071 
2072         smsc911x_eeprom_enable_access(pdata);
2073         smsc911x_eeprom_send_cmd(pdata, E2P_CMD_EPC_CMD_EWEN_);
2074         ret = smsc911x_eeprom_write_location(pdata, eeprom->offset, *data);
2075         smsc911x_eeprom_send_cmd(pdata, E2P_CMD_EPC_CMD_EWDS_);
2076 
2077         /* Single byte write, according to man page */
2078         eeprom->len = 1;
2079 
2080         return ret;
2081 }
2082 
2083 static const struct ethtool_ops smsc911x_ethtool_ops = {
2084         .get_settings = smsc911x_ethtool_getsettings,
2085         .set_settings = smsc911x_ethtool_setsettings,
2086         .get_link = ethtool_op_get_link,
2087         .get_drvinfo = smsc911x_ethtool_getdrvinfo,
2088         .nway_reset = smsc911x_ethtool_nwayreset,
2089         .get_msglevel = smsc911x_ethtool_getmsglevel,
2090         .set_msglevel = smsc911x_ethtool_setmsglevel,
2091         .get_regs_len = smsc911x_ethtool_getregslen,
2092         .get_regs = smsc911x_ethtool_getregs,
2093         .get_eeprom_len = smsc911x_ethtool_get_eeprom_len,
2094         .get_eeprom = smsc911x_ethtool_get_eeprom,
2095         .set_eeprom = smsc911x_ethtool_set_eeprom,
2096         .get_ts_info = ethtool_op_get_ts_info,
2097 };
2098 
2099 static const struct net_device_ops smsc911x_netdev_ops = {
2100         .ndo_open               = smsc911x_open,
2101         .ndo_stop               = smsc911x_stop,
2102         .ndo_start_xmit         = smsc911x_hard_start_xmit,
2103         .ndo_get_stats          = smsc911x_get_stats,
2104         .ndo_set_rx_mode        = smsc911x_set_multicast_list,
2105         .ndo_do_ioctl           = smsc911x_do_ioctl,
2106         .ndo_change_mtu         = eth_change_mtu,
2107         .ndo_validate_addr      = eth_validate_addr,
2108         .ndo_set_mac_address    = smsc911x_set_mac_address,
2109 #ifdef CONFIG_NET_POLL_CONTROLLER
2110         .ndo_poll_controller    = smsc911x_poll_controller,
2111 #endif
2112 };
2113 
2114 /* copies the current mac address from hardware to dev->dev_addr */
2115 static void smsc911x_read_mac_address(struct net_device *dev)
2116 {
2117         struct smsc911x_data *pdata = netdev_priv(dev);
2118         u32 mac_high16 = smsc911x_mac_read(pdata, ADDRH);
2119         u32 mac_low32 = smsc911x_mac_read(pdata, ADDRL);
2120 
2121         dev->dev_addr[0] = (u8)(mac_low32);
2122         dev->dev_addr[1] = (u8)(mac_low32 >> 8);
2123         dev->dev_addr[2] = (u8)(mac_low32 >> 16);
2124         dev->dev_addr[3] = (u8)(mac_low32 >> 24);
2125         dev->dev_addr[4] = (u8)(mac_high16);
2126         dev->dev_addr[5] = (u8)(mac_high16 >> 8);
2127 }
2128 
2129 /* Initializing private device structures, only called from probe */
2130 static int smsc911x_init(struct net_device *dev)
2131 {
2132         struct smsc911x_data *pdata = netdev_priv(dev);
2133         unsigned int byte_test, mask;
2134         unsigned int to = 100;
2135 
2136         SMSC_TRACE(pdata, probe, "Driver Parameters:");
2137         SMSC_TRACE(pdata, probe, "LAN base: 0x%08lX",
2138                    (unsigned long)pdata->ioaddr);
2139         SMSC_TRACE(pdata, probe, "IRQ: %d", dev->irq);
2140         SMSC_TRACE(pdata, probe, "PHY will be autodetected.");
2141 
2142         spin_lock_init(&pdata->dev_lock);
2143         spin_lock_init(&pdata->mac_lock);
2144 
2145         if (pdata->ioaddr == NULL) {
2146                 SMSC_WARN(pdata, probe, "pdata->ioaddr: 0x00000000");
2147                 return -ENODEV;
2148         }
2149 
2150         /*
2151          * poll the READY bit in PMT_CTRL. Any other access to the device is
2152          * forbidden while this bit isn't set. Try for 100ms
2153          *
2154          * Note that this test is done before the WORD_SWAP register is
2155          * programmed. So in some configurations the READY bit is at 16 before
2156          * WORD_SWAP is written to. This issue is worked around by waiting
2157          * until either bit 0 or bit 16 gets set in PMT_CTRL.
2158          *
2159          * SMSC has confirmed that checking bit 16 (marked as reserved in
2160          * the datasheet) is fine since these bits "will either never be set
2161          * or can only go high after READY does (so also indicate the device
2162          * is ready)".
2163          */
2164 
2165         mask = PMT_CTRL_READY_ | swahw32(PMT_CTRL_READY_);
2166         while (!(smsc911x_reg_read(pdata, PMT_CTRL) & mask) && --to)
2167                 udelay(1000);
2168 
2169         if (to == 0) {
2170                 netdev_err(dev, "Device not READY in 100ms aborting\n");
2171                 return -ENODEV;
2172         }
2173 
2174         /* Check byte ordering */
2175         byte_test = smsc911x_reg_read(pdata, BYTE_TEST);
2176         SMSC_TRACE(pdata, probe, "BYTE_TEST: 0x%08X", byte_test);
2177         if (byte_test == 0x43218765) {
2178                 SMSC_TRACE(pdata, probe, "BYTE_TEST looks swapped, "
2179                            "applying WORD_SWAP");
2180                 smsc911x_reg_write(pdata, WORD_SWAP, 0xffffffff);
2181 
2182                 /* 1 dummy read of BYTE_TEST is needed after a write to
2183                  * WORD_SWAP before its contents are valid */
2184                 byte_test = smsc911x_reg_read(pdata, BYTE_TEST);
2185 
2186                 byte_test = smsc911x_reg_read(pdata, BYTE_TEST);
2187         }
2188 
2189         if (byte_test != 0x87654321) {
2190                 SMSC_WARN(pdata, drv, "BYTE_TEST: 0x%08X", byte_test);
2191                 if (((byte_test >> 16) & 0xFFFF) == (byte_test & 0xFFFF)) {
2192                         SMSC_WARN(pdata, probe,
2193                                   "top 16 bits equal to bottom 16 bits");
2194                         SMSC_TRACE(pdata, probe,
2195                                    "This may mean the chip is set "
2196                                    "for 32 bit while the bus is reading 16 bit");
2197                 }
2198                 return -ENODEV;
2199         }
2200 
2201         /* Default generation to zero (all workarounds apply) */
2202         pdata->generation = 0;
2203 
2204         pdata->idrev = smsc911x_reg_read(pdata, ID_REV);
2205         switch (pdata->idrev & 0xFFFF0000) {
2206         case 0x01180000:
2207         case 0x01170000:
2208         case 0x01160000:
2209         case 0x01150000:
2210         case 0x218A0000:
2211                 /* LAN911[5678] family */
2212                 pdata->generation = pdata->idrev & 0x0000FFFF;
2213                 break;
2214 
2215         case 0x118A0000:
2216         case 0x117A0000:
2217         case 0x116A0000:
2218         case 0x115A0000:
2219                 /* LAN921[5678] family */
2220                 pdata->generation = 3;
2221                 break;
2222 
2223         case 0x92100000:
2224         case 0x92110000:
2225         case 0x92200000:
2226         case 0x92210000:
2227                 /* LAN9210/LAN9211/LAN9220/LAN9221 */
2228                 pdata->generation = 4;
2229                 break;
2230 
2231         default:
2232                 SMSC_WARN(pdata, probe, "LAN911x not identified, idrev: 0x%08X",
2233                           pdata->idrev);
2234                 return -ENODEV;
2235         }
2236 
2237         SMSC_TRACE(pdata, probe,
2238                    "LAN911x identified, idrev: 0x%08X, generation: %d",
2239                    pdata->idrev, pdata->generation);
2240 
2241         if (pdata->generation == 0)
2242                 SMSC_WARN(pdata, probe,
2243                           "This driver is not intended for this chip revision");
2244 
2245         /* workaround for platforms without an eeprom, where the mac address
2246          * is stored elsewhere and set by the bootloader.  This saves the
2247          * mac address before resetting the device */
2248         if (pdata->config.flags & SMSC911X_SAVE_MAC_ADDRESS) {
2249                 spin_lock_irq(&pdata->mac_lock);
2250                 smsc911x_read_mac_address(dev);
2251                 spin_unlock_irq(&pdata->mac_lock);
2252         }
2253 
2254         /* Reset the LAN911x */
2255         if (smsc911x_soft_reset(pdata))
2256                 return -ENODEV;
2257 
2258         ether_setup(dev);
2259         dev->flags |= IFF_MULTICAST;
2260         netif_napi_add(dev, &pdata->napi, smsc911x_poll, SMSC_NAPI_WEIGHT);
2261         dev->netdev_ops = &smsc911x_netdev_ops;
2262         dev->ethtool_ops = &smsc911x_ethtool_ops;
2263 
2264         return 0;
2265 }
2266 
2267 static int smsc911x_drv_remove(struct platform_device *pdev)
2268 {
2269         struct net_device *dev;
2270         struct smsc911x_data *pdata;
2271         struct resource *res;
2272 
2273         dev = platform_get_drvdata(pdev);
2274         BUG_ON(!dev);
2275         pdata = netdev_priv(dev);
2276         BUG_ON(!pdata);
2277         BUG_ON(!pdata->ioaddr);
2278         BUG_ON(!pdata->phy_dev);
2279 
2280         SMSC_TRACE(pdata, ifdown, "Stopping driver");
2281 
2282         phy_disconnect(pdata->phy_dev);
2283         pdata->phy_dev = NULL;
2284         mdiobus_unregister(pdata->mii_bus);
2285         mdiobus_free(pdata->mii_bus);
2286 
2287         unregister_netdev(dev);
2288         free_irq(dev->irq, dev);
2289         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
2290                                            "smsc911x-memory");
2291         if (!res)
2292                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2293 
2294         release_mem_region(res->start, resource_size(res));
2295 
2296         iounmap(pdata->ioaddr);
2297 
2298         (void)smsc911x_disable_resources(pdev);
2299         smsc911x_free_resources(pdev);
2300 
2301         free_netdev(dev);
2302 
2303         return 0;
2304 }
2305 
2306 /* standard register acces */
2307 static const struct smsc911x_ops standard_smsc911x_ops = {
2308         .reg_read = __smsc911x_reg_read,
2309         .reg_write = __smsc911x_reg_write,
2310         .rx_readfifo = smsc911x_rx_readfifo,
2311         .tx_writefifo = smsc911x_tx_writefifo,
2312 };
2313 
2314 /* shifted register access */
2315 static const struct smsc911x_ops shifted_smsc911x_ops = {
2316         .reg_read = __smsc911x_reg_read_shift,
2317         .reg_write = __smsc911x_reg_write_shift,
2318         .rx_readfifo = smsc911x_rx_readfifo_shift,
2319         .tx_writefifo = smsc911x_tx_writefifo_shift,
2320 };
2321 
2322 #ifdef CONFIG_OF
2323 static int smsc911x_probe_config_dt(struct smsc911x_platform_config *config,
2324                                     struct device_node *np)
2325 {
2326         const char *mac;
2327         u32 width = 0;
2328 
2329         if (!np)
2330                 return -ENODEV;
2331 
2332         config->phy_interface = of_get_phy_mode(np);
2333 
2334         mac = of_get_mac_address(np);
2335         if (mac)
2336                 memcpy(config->mac, mac, ETH_ALEN);
2337 
2338         of_property_read_u32(np, "reg-shift", &config->shift);
2339 
2340         of_property_read_u32(np, "reg-io-width", &width);
2341         if (width == 4)
2342                 config->flags |= SMSC911X_USE_32BIT;
2343         else
2344                 config->flags |= SMSC911X_USE_16BIT;
2345 
2346         if (of_get_property(np, "smsc,irq-active-high", NULL))
2347                 config->irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH;
2348 
2349         if (of_get_property(np, "smsc,irq-push-pull", NULL))
2350                 config->irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL;
2351 
2352         if (of_get_property(np, "smsc,force-internal-phy", NULL))
2353                 config->flags |= SMSC911X_FORCE_INTERNAL_PHY;
2354 
2355         if (of_get_property(np, "smsc,force-external-phy", NULL))
2356                 config->flags |= SMSC911X_FORCE_EXTERNAL_PHY;
2357 
2358         if (of_get_property(np, "smsc,save-mac-address", NULL))
2359                 config->flags |= SMSC911X_SAVE_MAC_ADDRESS;
2360 
2361         return 0;
2362 }
2363 #else
2364 static inline int smsc911x_probe_config_dt(
2365                                 struct smsc911x_platform_config *config,
2366                                 struct device_node *np)
2367 {
2368         return -ENODEV;
2369 }
2370 #endif /* CONFIG_OF */
2371 
2372 static int smsc911x_drv_probe(struct platform_device *pdev)
2373 {
2374         struct device_node *np = pdev->dev.of_node;
2375         struct net_device *dev;
2376         struct smsc911x_data *pdata;
2377         struct smsc911x_platform_config *config = dev_get_platdata(&pdev->dev);
2378         struct resource *res, *irq_res;
2379         unsigned int intcfg = 0;
2380         int res_size, irq_flags;
2381         int retval;
2382 
2383         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
2384                                            "smsc911x-memory");
2385         if (!res)
2386                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2387         if (!res) {
2388                 pr_warn("Could not allocate resource\n");
2389                 retval = -ENODEV;
2390                 goto out_0;
2391         }
2392         res_size = resource_size(res);
2393 
2394         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
2395         if (!irq_res) {
2396                 pr_warn("Could not allocate irq resource\n");
2397                 retval = -ENODEV;
2398                 goto out_0;
2399         }
2400 
2401         if (!request_mem_region(res->start, res_size, SMSC_CHIPNAME)) {
2402                 retval = -EBUSY;
2403                 goto out_0;
2404         }
2405 
2406         dev = alloc_etherdev(sizeof(struct smsc911x_data));
2407         if (!dev) {
2408                 retval = -ENOMEM;
2409                 goto out_release_io_1;
2410         }
2411 
2412         SET_NETDEV_DEV(dev, &pdev->dev);
2413 
2414         pdata = netdev_priv(dev);
2415         dev->irq = irq_res->start;
2416         irq_flags = irq_res->flags & IRQF_TRIGGER_MASK;
2417         pdata->ioaddr = ioremap_nocache(res->start, res_size);
2418 
2419         pdata->dev = dev;
2420         pdata->msg_enable = ((1 << debug) - 1);
2421 
2422         platform_set_drvdata(pdev, dev);
2423 
2424         retval = smsc911x_request_resources(pdev);
2425         if (retval)
2426                 goto out_request_resources_fail;
2427 
2428         retval = smsc911x_enable_resources(pdev);
2429         if (retval)
2430                 goto out_enable_resources_fail;
2431 
2432         if (pdata->ioaddr == NULL) {
2433                 SMSC_WARN(pdata, probe, "Error smsc911x base address invalid");
2434                 retval = -ENOMEM;
2435                 goto out_disable_resources;
2436         }
2437 
2438         retval = smsc911x_probe_config_dt(&pdata->config, np);
2439         if (retval && config) {
2440                 /* copy config parameters across to pdata */
2441                 memcpy(&pdata->config, config, sizeof(pdata->config));
2442                 retval = 0;
2443         }
2444 
2445         if (retval) {
2446                 SMSC_WARN(pdata, probe, "Error smsc911x config not found");
2447                 goto out_disable_resources;
2448         }
2449 
2450         /* assume standard, non-shifted, access to HW registers */
2451         pdata->ops = &standard_smsc911x_ops;
2452         /* apply the right access if shifting is needed */
2453         if (pdata->config.shift)
2454                 pdata->ops = &shifted_smsc911x_ops;
2455 
2456         retval = smsc911x_init(dev);
2457         if (retval < 0)
2458                 goto out_disable_resources;
2459 
2460         /* configure irq polarity and type before connecting isr */
2461         if (pdata->config.irq_polarity == SMSC911X_IRQ_POLARITY_ACTIVE_HIGH)
2462                 intcfg |= INT_CFG_IRQ_POL_;
2463 
2464         if (pdata->config.irq_type == SMSC911X_IRQ_TYPE_PUSH_PULL)
2465                 intcfg |= INT_CFG_IRQ_TYPE_;
2466 
2467         smsc911x_reg_write(pdata, INT_CFG, intcfg);
2468 
2469         /* Ensure interrupts are globally disabled before connecting ISR */
2470         smsc911x_disable_irq_chip(dev);
2471 
2472         retval = request_irq(dev->irq, smsc911x_irqhandler,
2473                              irq_flags | IRQF_SHARED, dev->name, dev);
2474         if (retval) {
2475                 SMSC_WARN(pdata, probe,
2476                           "Unable to claim requested irq: %d", dev->irq);
2477                 goto out_disable_resources;
2478         }
2479 
2480         netif_carrier_off(dev);
2481 
2482         retval = register_netdev(dev);
2483         if (retval) {
2484                 SMSC_WARN(pdata, probe, "Error %i registering device", retval);
2485                 goto out_free_irq;
2486         } else {
2487                 SMSC_TRACE(pdata, probe,
2488                            "Network interface: \"%s\"", dev->name);
2489         }
2490 
2491         retval = smsc911x_mii_init(pdev, dev);
2492         if (retval) {
2493                 SMSC_WARN(pdata, probe, "Error %i initialising mii", retval);
2494                 goto out_unregister_netdev_5;
2495         }
2496 
2497         spin_lock_irq(&pdata->mac_lock);
2498 
2499         /* Check if mac address has been specified when bringing interface up */
2500         if (is_valid_ether_addr(dev->dev_addr)) {
2501                 smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
2502                 SMSC_TRACE(pdata, probe,
2503                            "MAC Address is specified by configuration");
2504         } else if (is_valid_ether_addr(pdata->config.mac)) {
2505                 memcpy(dev->dev_addr, pdata->config.mac, ETH_ALEN);
2506                 SMSC_TRACE(pdata, probe,
2507                            "MAC Address specified by platform data");
2508         } else {
2509                 /* Try reading mac address from device. if EEPROM is present
2510                  * it will already have been set */
2511                 smsc_get_mac(dev);
2512 
2513                 if (is_valid_ether_addr(dev->dev_addr)) {
2514                         /* eeprom values are valid  so use them */
2515                         SMSC_TRACE(pdata, probe,
2516                                    "Mac Address is read from LAN911x EEPROM");
2517                 } else {
2518                         /* eeprom values are invalid, generate random MAC */
2519                         eth_hw_addr_random(dev);
2520                         smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
2521                         SMSC_TRACE(pdata, probe,
2522                                    "MAC Address is set to eth_random_addr");
2523                 }
2524         }
2525 
2526         spin_unlock_irq(&pdata->mac_lock);
2527 
2528         netdev_info(dev, "MAC Address: %pM\n", dev->dev_addr);
2529 
2530         return 0;
2531 
2532 out_unregister_netdev_5:
2533         unregister_netdev(dev);
2534 out_free_irq:
2535         free_irq(dev->irq, dev);
2536 out_disable_resources:
2537         (void)smsc911x_disable_resources(pdev);
2538 out_enable_resources_fail:
2539         smsc911x_free_resources(pdev);
2540 out_request_resources_fail:
2541         iounmap(pdata->ioaddr);
2542         free_netdev(dev);
2543 out_release_io_1:
2544         release_mem_region(res->start, resource_size(res));
2545 out_0:
2546         return retval;
2547 }
2548 
2549 #ifdef CONFIG_PM
2550 /* This implementation assumes the devices remains powered on its VDDVARIO
2551  * pins during suspend. */
2552 
2553 /* TODO: implement freeze/thaw callbacks for hibernation.*/
2554 
2555 static int smsc911x_suspend(struct device *dev)
2556 {
2557         struct net_device *ndev = dev_get_drvdata(dev);
2558         struct smsc911x_data *pdata = netdev_priv(ndev);
2559 
2560         /* enable wake on LAN, energy detection and the external PME
2561          * signal. */
2562         smsc911x_reg_write(pdata, PMT_CTRL,
2563                 PMT_CTRL_PM_MODE_D1_ | PMT_CTRL_WOL_EN_ |
2564                 PMT_CTRL_ED_EN_ | PMT_CTRL_PME_EN_);
2565 
2566         return 0;
2567 }
2568 
2569 static int smsc911x_resume(struct device *dev)
2570 {
2571         struct net_device *ndev = dev_get_drvdata(dev);
2572         struct smsc911x_data *pdata = netdev_priv(ndev);
2573         unsigned int to = 100;
2574 
2575         /* Note 3.11 from the datasheet:
2576          *      "When the LAN9220 is in a power saving state, a write of any
2577          *       data to the BYTE_TEST register will wake-up the device."
2578          */
2579         smsc911x_reg_write(pdata, BYTE_TEST, 0);
2580 
2581         /* poll the READY bit in PMT_CTRL. Any other access to the device is
2582          * forbidden while this bit isn't set. Try for 100ms and return -EIO
2583          * if it failed. */
2584         while (!(smsc911x_reg_read(pdata, PMT_CTRL) & PMT_CTRL_READY_) && --to)
2585                 udelay(1000);
2586 
2587         return (to == 0) ? -EIO : 0;
2588 }
2589 
2590 static const struct dev_pm_ops smsc911x_pm_ops = {
2591         .suspend        = smsc911x_suspend,
2592         .resume         = smsc911x_resume,
2593 };
2594 
2595 #define SMSC911X_PM_OPS (&smsc911x_pm_ops)
2596 
2597 #else
2598 #define SMSC911X_PM_OPS NULL
2599 #endif
2600 
2601 #ifdef CONFIG_OF
2602 static const struct of_device_id smsc911x_dt_ids[] = {
2603         { .compatible = "smsc,lan9115", },
2604         { /* sentinel */ }
2605 };
2606 MODULE_DEVICE_TABLE(of, smsc911x_dt_ids);
2607 #endif
2608 
2609 static struct platform_driver smsc911x_driver = {
2610         .probe = smsc911x_drv_probe,
2611         .remove = smsc911x_drv_remove,
2612         .driver = {
2613                 .name   = SMSC_CHIPNAME,
2614                 .owner  = THIS_MODULE,
2615                 .pm     = SMSC911X_PM_OPS,
2616                 .of_match_table = of_match_ptr(smsc911x_dt_ids),
2617         },
2618 };
2619 
2620 /* Entry point for loading the module */
2621 static int __init smsc911x_init_module(void)
2622 {
2623         SMSC_INITIALIZE();
2624         return platform_driver_register(&smsc911x_driver);
2625 }
2626 
2627 /* entry point for unloading the module */
2628 static void __exit smsc911x_cleanup_module(void)
2629 {
2630         platform_driver_unregister(&smsc911x_driver);
2631 }
2632 
2633 module_init(smsc911x_init_module);
2634 module_exit(smsc911x_cleanup_module);
2635 

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