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

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