Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/net/usb/sr9700.c

  1 /*
  2  * CoreChip-sz SR9700 one chip USB 1.1 Ethernet Devices
  3  *
  4  * Author : Liu Junliang <liujunliang_ljl@163.com>
  5  *
  6  * Based on dm9601.c
  7  *
  8  * This file is licensed under the terms of the GNU General Public License
  9  * version 2.  This program is licensed "as is" without any warranty of any
 10  * kind, whether express or implied.
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/sched.h>
 15 #include <linux/stddef.h>
 16 #include <linux/netdevice.h>
 17 #include <linux/etherdevice.h>
 18 #include <linux/ethtool.h>
 19 #include <linux/mii.h>
 20 #include <linux/usb.h>
 21 #include <linux/crc32.h>
 22 #include <linux/usb/usbnet.h>
 23 
 24 #include "sr9700.h"
 25 
 26 static int sr_read(struct usbnet *dev, u8 reg, u16 length, void *data)
 27 {
 28         int err;
 29 
 30         err = usbnet_read_cmd(dev, SR_RD_REGS, SR_REQ_RD_REG, 0, reg, data,
 31                               length);
 32         if ((err != length) && (err >= 0))
 33                 err = -EINVAL;
 34         return err;
 35 }
 36 
 37 static int sr_write(struct usbnet *dev, u8 reg, u16 length, void *data)
 38 {
 39         int err;
 40 
 41         err = usbnet_write_cmd(dev, SR_WR_REGS, SR_REQ_WR_REG, 0, reg, data,
 42                                length);
 43         if ((err >= 0) && (err < length))
 44                 err = -EINVAL;
 45         return err;
 46 }
 47 
 48 static int sr_read_reg(struct usbnet *dev, u8 reg, u8 *value)
 49 {
 50         return sr_read(dev, reg, 1, value);
 51 }
 52 
 53 static int sr_write_reg(struct usbnet *dev, u8 reg, u8 value)
 54 {
 55         return usbnet_write_cmd(dev, SR_WR_REGS, SR_REQ_WR_REG,
 56                                 value, reg, NULL, 0);
 57 }
 58 
 59 static void sr_write_async(struct usbnet *dev, u8 reg, u16 length, void *data)
 60 {
 61         usbnet_write_cmd_async(dev, SR_WR_REGS, SR_REQ_WR_REG,
 62                                0, reg, data, length);
 63 }
 64 
 65 static void sr_write_reg_async(struct usbnet *dev, u8 reg, u8 value)
 66 {
 67         usbnet_write_cmd_async(dev, SR_WR_REGS, SR_REQ_WR_REG,
 68                                value, reg, NULL, 0);
 69 }
 70 
 71 static int wait_phy_eeprom_ready(struct usbnet *dev, int phy)
 72 {
 73         int i;
 74 
 75         for (i = 0; i < SR_SHARE_TIMEOUT; i++) {
 76                 u8 tmp = 0;
 77                 int ret;
 78 
 79                 udelay(1);
 80                 ret = sr_read_reg(dev, EPCR, &tmp);
 81                 if (ret < 0)
 82                         return ret;
 83 
 84                 /* ready */
 85                 if (!(tmp & EPCR_ERRE))
 86                         return 0;
 87         }
 88 
 89         netdev_err(dev->net, "%s write timed out!\n", phy ? "phy" : "eeprom");
 90 
 91         return -EIO;
 92 }
 93 
 94 static int sr_share_read_word(struct usbnet *dev, int phy, u8 reg,
 95                               __le16 *value)
 96 {
 97         int ret;
 98 
 99         mutex_lock(&dev->phy_mutex);
100 
101         sr_write_reg(dev, EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
102         sr_write_reg(dev, EPCR, phy ? (EPCR_EPOS | EPCR_ERPRR) : EPCR_ERPRR);
103 
104         ret = wait_phy_eeprom_ready(dev, phy);
105         if (ret < 0)
106                 goto out_unlock;
107 
108         sr_write_reg(dev, EPCR, 0x0);
109         ret = sr_read(dev, EPDR, 2, value);
110 
111         netdev_dbg(dev->net, "read shared %d 0x%02x returned 0x%04x, %d\n",
112                    phy, reg, *value, ret);
113 
114 out_unlock:
115         mutex_unlock(&dev->phy_mutex);
116         return ret;
117 }
118 
119 static int sr_share_write_word(struct usbnet *dev, int phy, u8 reg,
120                                __le16 value)
121 {
122         int ret;
123 
124         mutex_lock(&dev->phy_mutex);
125 
126         ret = sr_write(dev, EPDR, 2, &value);
127         if (ret < 0)
128                 goto out_unlock;
129 
130         sr_write_reg(dev, EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
131         sr_write_reg(dev, EPCR, phy ? (EPCR_WEP | EPCR_EPOS | EPCR_ERPRW) :
132                     (EPCR_WEP | EPCR_ERPRW));
133 
134         ret = wait_phy_eeprom_ready(dev, phy);
135         if (ret < 0)
136                 goto out_unlock;
137 
138         sr_write_reg(dev, EPCR, 0x0);
139 
140 out_unlock:
141         mutex_unlock(&dev->phy_mutex);
142         return ret;
143 }
144 
145 static int sr_read_eeprom_word(struct usbnet *dev, u8 offset, void *value)
146 {
147         return sr_share_read_word(dev, 0, offset, value);
148 }
149 
150 static int sr9700_get_eeprom_len(struct net_device *netdev)
151 {
152         return SR_EEPROM_LEN;
153 }
154 
155 static int sr9700_get_eeprom(struct net_device *netdev,
156                              struct ethtool_eeprom *eeprom, u8 *data)
157 {
158         struct usbnet *dev = netdev_priv(netdev);
159         __le16 *buf = (__le16 *)data;
160         int ret = 0;
161         int i;
162 
163         /* access is 16bit */
164         if ((eeprom->offset & 0x01) || (eeprom->len & 0x01))
165                 return -EINVAL;
166 
167         for (i = 0; i < eeprom->len / 2; i++) {
168                 ret = sr_read_eeprom_word(dev, eeprom->offset / 2 + i, buf + i);
169                 if (ret < 0)
170                         break;
171         }
172 
173         return ret;
174 }
175 
176 static int sr_mdio_read(struct net_device *netdev, int phy_id, int loc)
177 {
178         struct usbnet *dev = netdev_priv(netdev);
179         __le16 res;
180         int rc = 0;
181 
182         if (phy_id) {
183                 netdev_dbg(netdev, "Only internal phy supported\n");
184                 return 0;
185         }
186 
187         /* Access NSR_LINKST bit for link status instead of MII_BMSR */
188         if (loc == MII_BMSR) {
189                 u8 value;
190 
191                 sr_read_reg(dev, NSR, &value);
192                 if (value & NSR_LINKST)
193                         rc = 1;
194         }
195         sr_share_read_word(dev, 1, loc, &res);
196         if (rc == 1)
197                 res = le16_to_cpu(res) | BMSR_LSTATUS;
198         else
199                 res = le16_to_cpu(res) & ~BMSR_LSTATUS;
200 
201         netdev_dbg(netdev, "sr_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
202                    phy_id, loc, res);
203 
204         return res;
205 }
206 
207 static void sr_mdio_write(struct net_device *netdev, int phy_id, int loc,
208                           int val)
209 {
210         struct usbnet *dev = netdev_priv(netdev);
211         __le16 res = cpu_to_le16(val);
212 
213         if (phy_id) {
214                 netdev_dbg(netdev, "Only internal phy supported\n");
215                 return;
216         }
217 
218         netdev_dbg(netdev, "sr_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
219                    phy_id, loc, val);
220 
221         sr_share_write_word(dev, 1, loc, res);
222 }
223 
224 static u32 sr9700_get_link(struct net_device *netdev)
225 {
226         struct usbnet *dev = netdev_priv(netdev);
227         u8 value = 0;
228         int rc = 0;
229 
230         /* Get the Link Status directly */
231         sr_read_reg(dev, NSR, &value);
232         if (value & NSR_LINKST)
233                 rc = 1;
234 
235         return rc;
236 }
237 
238 static int sr9700_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
239 {
240         struct usbnet *dev = netdev_priv(netdev);
241 
242         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
243 }
244 
245 static const struct ethtool_ops sr9700_ethtool_ops = {
246         .get_drvinfo    = usbnet_get_drvinfo,
247         .get_link       = sr9700_get_link,
248         .get_msglevel   = usbnet_get_msglevel,
249         .set_msglevel   = usbnet_set_msglevel,
250         .get_eeprom_len = sr9700_get_eeprom_len,
251         .get_eeprom     = sr9700_get_eeprom,
252         .get_settings   = usbnet_get_settings,
253         .set_settings   = usbnet_set_settings,
254         .nway_reset     = usbnet_nway_reset,
255 };
256 
257 static void sr9700_set_multicast(struct net_device *netdev)
258 {
259         struct usbnet *dev = netdev_priv(netdev);
260         /* We use the 20 byte dev->data for our 8 byte filter buffer
261          * to avoid allocating memory that is tricky to free later
262          */
263         u8 *hashes = (u8 *)&dev->data;
264         /* rx_ctl setting : enable, disable_long, disable_crc */
265         u8 rx_ctl = RCR_RXEN | RCR_DIS_CRC | RCR_DIS_LONG;
266 
267         memset(hashes, 0x00, SR_MCAST_SIZE);
268         /* broadcast address */
269         hashes[SR_MCAST_SIZE - 1] |= SR_MCAST_ADDR_FLAG;
270         if (netdev->flags & IFF_PROMISC) {
271                 rx_ctl |= RCR_PRMSC;
272         } else if (netdev->flags & IFF_ALLMULTI ||
273                    netdev_mc_count(netdev) > SR_MCAST_MAX) {
274                 rx_ctl |= RCR_RUNT;
275         } else if (!netdev_mc_empty(netdev)) {
276                 struct netdev_hw_addr *ha;
277 
278                 netdev_for_each_mc_addr(ha, netdev) {
279                         u32 crc = ether_crc(ETH_ALEN, ha->addr) >> 26;
280                         hashes[crc >> 3] |= 1 << (crc & 0x7);
281                 }
282         }
283 
284         sr_write_async(dev, MAR, SR_MCAST_SIZE, hashes);
285         sr_write_reg_async(dev, RCR, rx_ctl);
286 }
287 
288 static int sr9700_set_mac_address(struct net_device *netdev, void *p)
289 {
290         struct usbnet *dev = netdev_priv(netdev);
291         struct sockaddr *addr = p;
292 
293         if (!is_valid_ether_addr(addr->sa_data)) {
294                 netdev_err(netdev, "not setting invalid mac address %pM\n",
295                            addr->sa_data);
296                 return -EINVAL;
297         }
298 
299         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
300         sr_write_async(dev, PAR, 6, netdev->dev_addr);
301 
302         return 0;
303 }
304 
305 static const struct net_device_ops sr9700_netdev_ops = {
306         .ndo_open               = usbnet_open,
307         .ndo_stop               = usbnet_stop,
308         .ndo_start_xmit         = usbnet_start_xmit,
309         .ndo_tx_timeout         = usbnet_tx_timeout,
310         .ndo_change_mtu         = usbnet_change_mtu,
311         .ndo_validate_addr      = eth_validate_addr,
312         .ndo_do_ioctl           = sr9700_ioctl,
313         .ndo_set_rx_mode        = sr9700_set_multicast,
314         .ndo_set_mac_address    = sr9700_set_mac_address,
315 };
316 
317 static int sr9700_bind(struct usbnet *dev, struct usb_interface *intf)
318 {
319         struct net_device *netdev;
320         struct mii_if_info *mii;
321         int ret;
322 
323         ret = usbnet_get_endpoints(dev, intf);
324         if (ret)
325                 goto out;
326 
327         netdev = dev->net;
328 
329         netdev->netdev_ops = &sr9700_netdev_ops;
330         netdev->ethtool_ops = &sr9700_ethtool_ops;
331         netdev->hard_header_len += SR_TX_OVERHEAD;
332         dev->hard_mtu = netdev->mtu + netdev->hard_header_len;
333         /* bulkin buffer is preferably not less than 3K */
334         dev->rx_urb_size = 3072;
335 
336         mii = &dev->mii;
337         mii->dev = netdev;
338         mii->mdio_read = sr_mdio_read;
339         mii->mdio_write = sr_mdio_write;
340         mii->phy_id_mask = 0x1f;
341         mii->reg_num_mask = 0x1f;
342 
343         sr_write_reg(dev, NCR, NCR_RST);
344         udelay(20);
345 
346         /* read MAC
347          * After Chip Power on, the Chip will reload the MAC from
348          * EEPROM automatically to PAR. In case there is no EEPROM externally,
349          * a default MAC address is stored in PAR for making chip work properly.
350          */
351         if (sr_read(dev, PAR, ETH_ALEN, netdev->dev_addr) < 0) {
352                 netdev_err(netdev, "Error reading MAC address\n");
353                 ret = -ENODEV;
354                 goto out;
355         }
356 
357         /* power up and reset phy */
358         sr_write_reg(dev, PRR, PRR_PHY_RST);
359         /* at least 10ms, here 20ms for safe */
360         mdelay(20);
361         sr_write_reg(dev, PRR, 0);
362         /* at least 1ms, here 2ms for reading right register */
363         udelay(2 * 1000);
364 
365         /* receive broadcast packets */
366         sr9700_set_multicast(netdev);
367 
368         sr_mdio_write(netdev, mii->phy_id, MII_BMCR, BMCR_RESET);
369         sr_mdio_write(netdev, mii->phy_id, MII_ADVERTISE, ADVERTISE_ALL |
370                       ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP);
371         mii_nway_restart(mii);
372 
373 out:
374         return ret;
375 }
376 
377 static int sr9700_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
378 {
379         struct sk_buff *sr_skb;
380         int len;
381 
382         /* skb content (packets) format :
383          *                    p0            p1            p2    ......    pm
384          *                 /      \
385          *            /                \
386          *        /                            \
387          *  /                                        \
388          * p0b0 p0b1 p0b2 p0b3 ...... p0b(n-4) p0b(n-3)...p0bn
389          *
390          * p0 : packet 0
391          * p0b0 : packet 0 byte 0
392          *
393          * b0: rx status
394          * b1: packet length (incl crc) low
395          * b2: packet length (incl crc) high
396          * b3..n-4: packet data
397          * bn-3..bn: ethernet packet crc
398          */
399         if (unlikely(skb->len < SR_RX_OVERHEAD)) {
400                 netdev_err(dev->net, "unexpected tiny rx frame\n");
401                 return 0;
402         }
403 
404         /* one skb may contains multiple packets */
405         while (skb->len > SR_RX_OVERHEAD) {
406                 if (skb->data[0] != 0x40)
407                         return 0;
408 
409                 /* ignore the CRC length */
410                 len = (skb->data[1] | (skb->data[2] << 8)) - 4;
411 
412                 if (len > ETH_FRAME_LEN)
413                         return 0;
414 
415                 /* the last packet of current skb */
416                 if (skb->len == (len + SR_RX_OVERHEAD)) {
417                         skb_pull(skb, 3);
418                         skb->len = len;
419                         skb_set_tail_pointer(skb, len);
420                         skb->truesize = len + sizeof(struct sk_buff);
421                         return 2;
422                 }
423 
424                 /* skb_clone is used for address align */
425                 sr_skb = skb_clone(skb, GFP_ATOMIC);
426                 if (!sr_skb)
427                         return 0;
428 
429                 sr_skb->len = len;
430                 sr_skb->data = skb->data + 3;
431                 skb_set_tail_pointer(sr_skb, len);
432                 sr_skb->truesize = len + sizeof(struct sk_buff);
433                 usbnet_skb_return(dev, sr_skb);
434 
435                 skb_pull(skb, len + SR_RX_OVERHEAD);
436         };
437 
438         return 0;
439 }
440 
441 static struct sk_buff *sr9700_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
442                                        gfp_t flags)
443 {
444         int len;
445 
446         /* SR9700 can only send out one ethernet packet at once.
447          *
448          * b0 b1 b2 b3 ...... b(n-4) b(n-3)...bn
449          *
450          * b0: rx status
451          * b1: packet length (incl crc) low
452          * b2: packet length (incl crc) high
453          * b3..n-4: packet data
454          * bn-3..bn: ethernet packet crc
455          */
456 
457         len = skb->len;
458 
459         if (skb_headroom(skb) < SR_TX_OVERHEAD) {
460                 struct sk_buff *skb2;
461 
462                 skb2 = skb_copy_expand(skb, SR_TX_OVERHEAD, 0, flags);
463                 dev_kfree_skb_any(skb);
464                 skb = skb2;
465                 if (!skb)
466                         return NULL;
467         }
468 
469         __skb_push(skb, SR_TX_OVERHEAD);
470 
471         /* usbnet adds padding if length is a multiple of packet size
472          * if so, adjust length value in header
473          */
474         if ((skb->len % dev->maxpacket) == 0)
475                 len++;
476 
477         skb->data[0] = len;
478         skb->data[1] = len >> 8;
479 
480         return skb;
481 }
482 
483 static void sr9700_status(struct usbnet *dev, struct urb *urb)
484 {
485         int link;
486         u8 *buf;
487 
488         /* format:
489            b0: net status
490            b1: tx status 1
491            b2: tx status 2
492            b3: rx status
493            b4: rx overflow
494            b5: rx count
495            b6: tx count
496            b7: gpr
497         */
498 
499         if (urb->actual_length < 8)
500                 return;
501 
502         buf = urb->transfer_buffer;
503 
504         link = !!(buf[0] & 0x40);
505         if (netif_carrier_ok(dev->net) != link) {
506                 usbnet_link_change(dev, link, 1);
507                 netdev_dbg(dev->net, "Link Status is: %d\n", link);
508         }
509 }
510 
511 static int sr9700_link_reset(struct usbnet *dev)
512 {
513         struct ethtool_cmd ecmd;
514 
515         mii_check_media(&dev->mii, 1, 1);
516         mii_ethtool_gset(&dev->mii, &ecmd);
517 
518         netdev_dbg(dev->net, "link_reset() speed: %d duplex: %d\n",
519                    ecmd.speed, ecmd.duplex);
520 
521         return 0;
522 }
523 
524 static const struct driver_info sr9700_driver_info = {
525         .description    = "CoreChip SR9700 USB Ethernet",
526         .flags          = FLAG_ETHER,
527         .bind           = sr9700_bind,
528         .rx_fixup       = sr9700_rx_fixup,
529         .tx_fixup       = sr9700_tx_fixup,
530         .status         = sr9700_status,
531         .link_reset     = sr9700_link_reset,
532         .reset          = sr9700_link_reset,
533 };
534 
535 static const struct usb_device_id products[] = {
536         {
537                 USB_DEVICE(0x0fe6, 0x9700),     /* SR9700 device */
538                 .driver_info = (unsigned long)&sr9700_driver_info,
539         },
540         {},                     /* END */
541 };
542 
543 MODULE_DEVICE_TABLE(usb, products);
544 
545 static struct usb_driver sr9700_usb_driver = {
546         .name           = "sr9700",
547         .id_table       = products,
548         .probe          = usbnet_probe,
549         .disconnect     = usbnet_disconnect,
550         .suspend        = usbnet_suspend,
551         .resume         = usbnet_resume,
552         .disable_hub_initiated_lpm = 1,
553 };
554 
555 module_usb_driver(sr9700_usb_driver);
556 
557 MODULE_AUTHOR("liujl <liujunliang_ljl@163.com>");
558 MODULE_DESCRIPTION("SR9700 one chip USB 1.1 USB to Ethernet device from http://www.corechip-sz.com/");
559 MODULE_LICENSE("GPL");
560 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us