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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / net / ethernet / smsc / smsc9420.c
blobf30d4b17c7fbe087567776f1e4f514e47d47cd87
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /***************************************************************************
3 *
4 * Copyright (C) 2007,2008 SMSC
5 *
6 ***************************************************************************
7 */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11 #include <linux/interrupt.h>
12 #include <linux/kernel.h>
13 #include <linux/netdevice.h>
14 #include <linux/phy.h>
15 #include <linux/pci.h>
16 #include <linux/if_vlan.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/crc32.h>
19 #include <linux/slab.h>
20 #include <linux/module.h>
21 #include <linux/unaligned.h>
22 #include "smsc9420.h"
23
24 #define DRV_NAME "smsc9420"
25 #define DRV_MDIONAME "smsc9420-mdio"
26 #define DRV_DESCRIPTION "SMSC LAN9420 driver"
27 #define DRV_VERSION "1.01"
28
29 MODULE_DESCRIPTION("SMSC LAN9420 Ethernet driver");
30 MODULE_LICENSE("GPL");
31 MODULE_VERSION(DRV_VERSION);
32
33 struct smsc9420_dma_desc {
34 u32 status;
35 u32 length;
36 u32 buffer1;
37 u32 buffer2;
38 };
39
40 struct smsc9420_ring_info {
41 struct sk_buff *skb;
42 dma_addr_t mapping;
43 };
44
45 struct smsc9420_pdata {
46 void __iomem *ioaddr;
47 struct pci_dev *pdev;
48 struct net_device *dev;
49
50 struct smsc9420_dma_desc *rx_ring;
51 struct smsc9420_dma_desc *tx_ring;
52 struct smsc9420_ring_info *tx_buffers;
53 struct smsc9420_ring_info *rx_buffers;
54 dma_addr_t rx_dma_addr;
55 dma_addr_t tx_dma_addr;
56 int tx_ring_head, tx_ring_tail;
57 int rx_ring_head, rx_ring_tail;
58
59 spinlock_t int_lock;
60 spinlock_t phy_lock;
61
62 struct napi_struct napi;
63
64 bool software_irq_signal;
65 bool rx_csum;
66 u32 msg_enable;
67
68 struct mii_bus *mii_bus;
69 int last_duplex;
70 int last_carrier;
71 };
72
73 static const struct pci_device_id smsc9420_id_table[] = {
74 { PCI_VENDOR_ID_9420, PCI_DEVICE_ID_9420, PCI_ANY_ID, PCI_ANY_ID, },
75 { 0, }
76 };
77
78 MODULE_DEVICE_TABLE(pci, smsc9420_id_table);
79
80 #define SMSC_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
81
82 static uint smsc_debug;
83 static uint debug = -1;
84 module_param(debug, uint, 0);
85 MODULE_PARM_DESC(debug, "debug level");
86
87 static inline u32 smsc9420_reg_read(struct smsc9420_pdata *pd, u32 offset)
88 {
89 return ioread32(pd->ioaddr + offset);
90 }
91
92 static inline void
93 smsc9420_reg_write(struct smsc9420_pdata *pd, u32 offset, u32 value)
94 {
95 iowrite32(value, pd->ioaddr + offset);
96 }
97
98 static inline void smsc9420_pci_flush_write(struct smsc9420_pdata *pd)
99 {
100 /* to ensure PCI write completion, we must perform a PCI read */
101 smsc9420_reg_read(pd, ID_REV);
102 }
103
104 static int smsc9420_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
105 {
106 struct smsc9420_pdata *pd = bus->priv;
107 unsigned long flags;
108 u32 addr;
109 int i, reg = -EIO;
110
111 spin_lock_irqsave(&pd->phy_lock, flags);
112
113 /* confirm MII not busy */
114 if ((smsc9420_reg_read(pd, MII_ACCESS) & MII_ACCESS_MII_BUSY_)) {
115 netif_warn(pd, drv, pd->dev, "MII is busy???\n");
116 goto out;
117 }
118
119 /* set the address, index & direction (read from PHY) */
120 addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6) |
121 MII_ACCESS_MII_READ_;
122 smsc9420_reg_write(pd, MII_ACCESS, addr);
123
124 /* wait for read to complete with 50us timeout */
125 for (i = 0; i < 5; i++) {
126 if (!(smsc9420_reg_read(pd, MII_ACCESS) &
127 MII_ACCESS_MII_BUSY_)) {
128 reg = (u16)smsc9420_reg_read(pd, MII_DATA);
129 goto out;
130 }
131 udelay(10);
132 }
133
134 netif_warn(pd, drv, pd->dev, "MII busy timeout!\n");
135
136 out:
137 spin_unlock_irqrestore(&pd->phy_lock, flags);
138 return reg;
139 }
140
141 static int smsc9420_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
142 u16 val)
143 {
144 struct smsc9420_pdata *pd = bus->priv;
145 unsigned long flags;
146 u32 addr;
147 int i, reg = -EIO;
148
149 spin_lock_irqsave(&pd->phy_lock, flags);
150
151 /* confirm MII not busy */
152 if ((smsc9420_reg_read(pd, MII_ACCESS) & MII_ACCESS_MII_BUSY_)) {
153 netif_warn(pd, drv, pd->dev, "MII is busy???\n");
154 goto out;
155 }
156
157 /* put the data to write in the MAC */
158 smsc9420_reg_write(pd, MII_DATA, (u32)val);
159
160 /* set the address, index & direction (write to PHY) */
161 addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6) |
162 MII_ACCESS_MII_WRITE_;
163 smsc9420_reg_write(pd, MII_ACCESS, addr);
164
165 /* wait for write to complete with 50us timeout */
166 for (i = 0; i < 5; i++) {
167 if (!(smsc9420_reg_read(pd, MII_ACCESS) &
168 MII_ACCESS_MII_BUSY_)) {
169 reg = 0;
170 goto out;
171 }
172 udelay(10);
173 }
174
175 netif_warn(pd, drv, pd->dev, "MII busy timeout!\n");
176
177 out:
178 spin_unlock_irqrestore(&pd->phy_lock, flags);
179 return reg;
180 }
181
182 /* Returns hash bit number for given MAC address
183 * Example:
184 * 01 00 5E 00 00 01 -> returns bit number 31 */
185 static u32 smsc9420_hash(u8 addr[ETH_ALEN])
186 {
187 return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
188 }
189
190 static int smsc9420_eeprom_reload(struct smsc9420_pdata *pd)
191 {
192 int timeout = 100000;
193
194 BUG_ON(!pd);
195
196 if (smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
197 netif_dbg(pd, drv, pd->dev, "%s: Eeprom busy\n", __func__);
198 return -EIO;
199 }
200
201 smsc9420_reg_write(pd, E2P_CMD,
202 (E2P_CMD_EPC_BUSY_ | E2P_CMD_EPC_CMD_RELOAD_));
203
204 do {
205 udelay(10);
206 if (!(smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_))
207 return 0;
208 } while (timeout--);
209
210 netif_warn(pd, drv, pd->dev, "%s: Eeprom timed out\n", __func__);
211 return -EIO;
212 }
213
214 static void smsc9420_ethtool_get_drvinfo(struct net_device *netdev,
215 struct ethtool_drvinfo *drvinfo)
216 {
217 struct smsc9420_pdata *pd = netdev_priv(netdev);
218
219 strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
220 strscpy(drvinfo->bus_info, pci_name(pd->pdev),
221 sizeof(drvinfo->bus_info));
222 strscpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
223 }
224
225 static u32 smsc9420_ethtool_get_msglevel(struct net_device *netdev)
226 {
227 struct smsc9420_pdata *pd = netdev_priv(netdev);
228 return pd->msg_enable;
229 }
230
231 static void smsc9420_ethtool_set_msglevel(struct net_device *netdev, u32 data)
232 {
233 struct smsc9420_pdata *pd = netdev_priv(netdev);
234 pd->msg_enable = data;
235 }
236
237 static int smsc9420_ethtool_getregslen(struct net_device *dev)
238 {
239 /* all smsc9420 registers plus all phy registers */
240 return 0x100 + (32 * sizeof(u32));
241 }
242
243 static void
244 smsc9420_ethtool_getregs(struct net_device *dev, struct ethtool_regs *regs,
245 void *buf)
246 {
247 struct smsc9420_pdata *pd = netdev_priv(dev);
248 struct phy_device *phy_dev = dev->phydev;
249 unsigned int i, j = 0;
250 u32 *data = buf;
251
252 regs->version = smsc9420_reg_read(pd, ID_REV);
253 for (i = 0; i < 0x100; i += (sizeof(u32)))
254 data[j++] = smsc9420_reg_read(pd, i);
255
256 // cannot read phy registers if the net device is down
257 if (!phy_dev)
258 return;
259
260 for (i = 0; i <= 31; i++)
261 data[j++] = smsc9420_mii_read(phy_dev->mdio.bus,
262 phy_dev->mdio.addr, i);
263 }
264
265 static void smsc9420_eeprom_enable_access(struct smsc9420_pdata *pd)
266 {
267 unsigned int temp = smsc9420_reg_read(pd, GPIO_CFG);
268 temp &= ~GPIO_CFG_EEPR_EN_;
269 smsc9420_reg_write(pd, GPIO_CFG, temp);
270 msleep(1);
271 }
272
273 static int smsc9420_eeprom_send_cmd(struct smsc9420_pdata *pd, u32 op)
274 {
275 int timeout = 100;
276 u32 e2cmd;
277
278 netif_dbg(pd, hw, pd->dev, "op 0x%08x\n", op);
279 if (smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
280 netif_warn(pd, hw, pd->dev, "Busy at start\n");
281 return -EBUSY;
282 }
283
284 e2cmd = op | E2P_CMD_EPC_BUSY_;
285 smsc9420_reg_write(pd, E2P_CMD, e2cmd);
286
287 do {
288 msleep(1);
289 e2cmd = smsc9420_reg_read(pd, E2P_CMD);
290 } while ((e2cmd & E2P_CMD_EPC_BUSY_) && (--timeout));
291
292 if (!timeout) {
293 netif_info(pd, hw, pd->dev, "TIMED OUT\n");
294 return -EAGAIN;
295 }
296
297 if (e2cmd & E2P_CMD_EPC_TIMEOUT_) {
298 netif_info(pd, hw, pd->dev,
299 "Error occurred during eeprom operation\n");
300 return -EINVAL;
301 }
302
303 return 0;
304 }
305
306 static int smsc9420_eeprom_read_location(struct smsc9420_pdata *pd,
307 u8 address, u8 *data)
308 {
309 u32 op = E2P_CMD_EPC_CMD_READ_ | address;
310 int ret;
311
312 netif_dbg(pd, hw, pd->dev, "address 0x%x\n", address);
313 ret = smsc9420_eeprom_send_cmd(pd, op);
314
315 if (!ret)
316 data[address] = smsc9420_reg_read(pd, E2P_DATA);
317
318 return ret;
319 }
320
321 static int smsc9420_eeprom_write_location(struct smsc9420_pdata *pd,
322 u8 address, u8 data)
323 {
324 u32 op = E2P_CMD_EPC_CMD_ERASE_ | address;
325 int ret;
326
327 netif_dbg(pd, hw, pd->dev, "address 0x%x, data 0x%x\n", address, data);
328 ret = smsc9420_eeprom_send_cmd(pd, op);
329
330 if (!ret) {
331 op = E2P_CMD_EPC_CMD_WRITE_ | address;
332 smsc9420_reg_write(pd, E2P_DATA, (u32)data);
333 ret = smsc9420_eeprom_send_cmd(pd, op);
334 }
335
336 return ret;
337 }
338
339 static int smsc9420_ethtool_get_eeprom_len(struct net_device *dev)
340 {
341 return SMSC9420_EEPROM_SIZE;
342 }
343
344 static int smsc9420_ethtool_get_eeprom(struct net_device *dev,
345 struct ethtool_eeprom *eeprom, u8 *data)
346 {
347 struct smsc9420_pdata *pd = netdev_priv(dev);
348 u8 eeprom_data[SMSC9420_EEPROM_SIZE];
349 int len, i;
350
351 smsc9420_eeprom_enable_access(pd);
352
353 len = min(eeprom->len, SMSC9420_EEPROM_SIZE);
354 for (i = 0; i < len; i++) {
355 int ret = smsc9420_eeprom_read_location(pd, i, eeprom_data);
356 if (ret < 0) {
357 eeprom->len = 0;
358 return ret;
359 }
360 }
361
362 memcpy(data, &eeprom_data[eeprom->offset], len);
363 eeprom->magic = SMSC9420_EEPROM_MAGIC;
364 eeprom->len = len;
365 return 0;
366 }
367
368 static int smsc9420_ethtool_set_eeprom(struct net_device *dev,
369 struct ethtool_eeprom *eeprom, u8 *data)
370 {
371 struct smsc9420_pdata *pd = netdev_priv(dev);
372 int ret;
373
374 if (eeprom->magic != SMSC9420_EEPROM_MAGIC)
375 return -EINVAL;
376
377 smsc9420_eeprom_enable_access(pd);
378 smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWEN_);
379 ret = smsc9420_eeprom_write_location(pd, eeprom->offset, *data);
380 smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWDS_);
381
382 /* Single byte write, according to man page */
383 eeprom->len = 1;
384
385 return ret;
386 }
387
388 static const struct ethtool_ops smsc9420_ethtool_ops = {
389 .get_drvinfo = smsc9420_ethtool_get_drvinfo,
390 .get_msglevel = smsc9420_ethtool_get_msglevel,
391 .set_msglevel = smsc9420_ethtool_set_msglevel,
392 .nway_reset = phy_ethtool_nway_reset,
393 .get_link = ethtool_op_get_link,
394 .get_eeprom_len = smsc9420_ethtool_get_eeprom_len,
395 .get_eeprom = smsc9420_ethtool_get_eeprom,
396 .set_eeprom = smsc9420_ethtool_set_eeprom,
397 .get_regs_len = smsc9420_ethtool_getregslen,
398 .get_regs = smsc9420_ethtool_getregs,
399 .get_ts_info = ethtool_op_get_ts_info,
400 .get_link_ksettings = phy_ethtool_get_link_ksettings,
401 .set_link_ksettings = phy_ethtool_set_link_ksettings,
402 };
403
404 /* Sets the device MAC address to dev_addr */
405 static void smsc9420_set_mac_address(struct net_device *dev)
406 {
407 struct smsc9420_pdata *pd = netdev_priv(dev);
408 const u8 *dev_addr = dev->dev_addr;
409 u32 mac_high16 = (dev_addr[5] << 8) | dev_addr[4];
410 u32 mac_low32 = (dev_addr[3] << 24) | (dev_addr[2] << 16) |
411 (dev_addr[1] << 8) | dev_addr[0];
412
413 smsc9420_reg_write(pd, ADDRH, mac_high16);
414 smsc9420_reg_write(pd, ADDRL, mac_low32);
415 }
416
417 static void smsc9420_check_mac_address(struct net_device *dev)
418 {
419 struct smsc9420_pdata *pd = netdev_priv(dev);
420 u8 addr[ETH_ALEN];
421
422 /* Check if mac address has been specified when bringing interface up */
423 if (is_valid_ether_addr(dev->dev_addr)) {
424 smsc9420_set_mac_address(dev);
425 netif_dbg(pd, probe, pd->dev,
426 "MAC Address is specified by configuration\n");
427 } else {
428 /* Try reading mac address from device. if EEPROM is present
429 * it will already have been set */
430 u32 mac_high16 = smsc9420_reg_read(pd, ADDRH);
431 u32 mac_low32 = smsc9420_reg_read(pd, ADDRL);
432 addr[0] = (u8)(mac_low32);
433 addr[1] = (u8)(mac_low32 >> 8);
434 addr[2] = (u8)(mac_low32 >> 16);
435 addr[3] = (u8)(mac_low32 >> 24);
436 addr[4] = (u8)(mac_high16);
437 addr[5] = (u8)(mac_high16 >> 8);
438
439 if (is_valid_ether_addr(addr)) {
440 /* eeprom values are valid so use them */
441 eth_hw_addr_set(dev, addr);
442 netif_dbg(pd, probe, pd->dev,
443 "Mac Address is read from EEPROM\n");
444 } else {
445 /* eeprom values are invalid, generate random MAC */
446 eth_hw_addr_random(dev);
447 smsc9420_set_mac_address(dev);
448 netif_dbg(pd, probe, pd->dev,
449 "MAC Address is set to random\n");
450 }
451 }
452 }
453
454 static void smsc9420_stop_tx(struct smsc9420_pdata *pd)
455 {
456 u32 dmac_control, mac_cr, dma_intr_ena;
457 int timeout = 1000;
458
459 /* disable TX DMAC */
460 dmac_control = smsc9420_reg_read(pd, DMAC_CONTROL);
461 dmac_control &= (~DMAC_CONTROL_ST_);
462 smsc9420_reg_write(pd, DMAC_CONTROL, dmac_control);
463
464 /* Wait max 10ms for transmit process to stop */
465 while (--timeout) {
466 if (smsc9420_reg_read(pd, DMAC_STATUS) & DMAC_STS_TS_)
467 break;
468 udelay(10);
469 }
470
471 if (!timeout)
472 netif_warn(pd, ifdown, pd->dev, "TX DMAC failed to stop\n");
473
474 /* ACK Tx DMAC stop bit */
475 smsc9420_reg_write(pd, DMAC_STATUS, DMAC_STS_TXPS_);
476
477 /* mask TX DMAC interrupts */
478 dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
479 dma_intr_ena &= ~(DMAC_INTR_ENA_TX_);
480 smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
481 smsc9420_pci_flush_write(pd);
482
483 /* stop MAC TX */
484 mac_cr = smsc9420_reg_read(pd, MAC_CR) & (~MAC_CR_TXEN_);
485 smsc9420_reg_write(pd, MAC_CR, mac_cr);
486 smsc9420_pci_flush_write(pd);
487 }
488
489 static void smsc9420_free_tx_ring(struct smsc9420_pdata *pd)
490 {
491 int i;
492
493 BUG_ON(!pd->tx_ring);
494
495 if (!pd->tx_buffers)
496 return;
497
498 for (i = 0; i < TX_RING_SIZE; i++) {
499 struct sk_buff *skb = pd->tx_buffers[i].skb;
500
501 if (skb) {
502 BUG_ON(!pd->tx_buffers[i].mapping);
503 dma_unmap_single(&pd->pdev->dev,
504 pd->tx_buffers[i].mapping, skb->len,
505 DMA_TO_DEVICE);
506 dev_kfree_skb_any(skb);
507 }
508
509 pd->tx_ring[i].status = 0;
510 pd->tx_ring[i].length = 0;
511 pd->tx_ring[i].buffer1 = 0;
512 pd->tx_ring[i].buffer2 = 0;
513 }
514 wmb();
515
516 kfree(pd->tx_buffers);
517 pd->tx_buffers = NULL;
518
519 pd->tx_ring_head = 0;
520 pd->tx_ring_tail = 0;
521 }
522
523 static void smsc9420_free_rx_ring(struct smsc9420_pdata *pd)
524 {
525 int i;
526
527 BUG_ON(!pd->rx_ring);
528
529 if (!pd->rx_buffers)
530 return;
531
532 for (i = 0; i < RX_RING_SIZE; i++) {
533 if (pd->rx_buffers[i].skb)
534 dev_kfree_skb_any(pd->rx_buffers[i].skb);
535
536 if (pd->rx_buffers[i].mapping)
537 dma_unmap_single(&pd->pdev->dev,
538 pd->rx_buffers[i].mapping,
539 PKT_BUF_SZ, DMA_FROM_DEVICE);
540
541 pd->rx_ring[i].status = 0;
542 pd->rx_ring[i].length = 0;
543 pd->rx_ring[i].buffer1 = 0;
544 pd->rx_ring[i].buffer2 = 0;
545 }
546 wmb();
547
548 kfree(pd->rx_buffers);
549 pd->rx_buffers = NULL;
550
551 pd->rx_ring_head = 0;
552 pd->rx_ring_tail = 0;
553 }
554
555 static void smsc9420_stop_rx(struct smsc9420_pdata *pd)
556 {
557 int timeout = 1000;
558 u32 mac_cr, dmac_control, dma_intr_ena;
559
560 /* mask RX DMAC interrupts */
561 dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
562 dma_intr_ena &= (~DMAC_INTR_ENA_RX_);
563 smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
564 smsc9420_pci_flush_write(pd);
565
566 /* stop RX MAC prior to stoping DMA */
567 mac_cr = smsc9420_reg_read(pd, MAC_CR) & (~MAC_CR_RXEN_);
568 smsc9420_reg_write(pd, MAC_CR, mac_cr);
569 smsc9420_pci_flush_write(pd);
570
571 /* stop RX DMAC */
572 dmac_control = smsc9420_reg_read(pd, DMAC_CONTROL);
573 dmac_control &= (~DMAC_CONTROL_SR_);
574 smsc9420_reg_write(pd, DMAC_CONTROL, dmac_control);
575 smsc9420_pci_flush_write(pd);
576
577 /* wait up to 10ms for receive to stop */
578 while (--timeout) {
579 if (smsc9420_reg_read(pd, DMAC_STATUS) & DMAC_STS_RS_)
580 break;
581 udelay(10);
582 }
583
584 if (!timeout)
585 netif_warn(pd, ifdown, pd->dev,
586 "RX DMAC did not stop! timeout\n");
587
588 /* ACK the Rx DMAC stop bit */
589 smsc9420_reg_write(pd, DMAC_STATUS, DMAC_STS_RXPS_);
590 }
591
592 static irqreturn_t smsc9420_isr(int irq, void *dev_id)
593 {
594 struct smsc9420_pdata *pd = dev_id;
595 u32 int_cfg, int_sts, int_ctl;
596 irqreturn_t ret = IRQ_NONE;
597 ulong flags;
598
599 BUG_ON(!pd);
600 BUG_ON(!pd->ioaddr);
601
602 int_cfg = smsc9420_reg_read(pd, INT_CFG);
603
604 /* check if it's our interrupt */
605 if ((int_cfg & (INT_CFG_IRQ_EN_ | INT_CFG_IRQ_INT_)) !=
606 (INT_CFG_IRQ_EN_ | INT_CFG_IRQ_INT_))
607 return IRQ_NONE;
608
609 int_sts = smsc9420_reg_read(pd, INT_STAT);
610
611 if (likely(INT_STAT_DMAC_INT_ & int_sts)) {
612 u32 status = smsc9420_reg_read(pd, DMAC_STATUS);
613 u32 ints_to_clear = 0;
614
615 if (status & DMAC_STS_TX_) {
616 ints_to_clear |= (DMAC_STS_TX_ | DMAC_STS_NIS_);
617 netif_wake_queue(pd->dev);
618 }
619
620 if (status & DMAC_STS_RX_) {
621 /* mask RX DMAC interrupts */
622 u32 dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
623 dma_intr_ena &= (~DMAC_INTR_ENA_RX_);
624 smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
625 smsc9420_pci_flush_write(pd);
626
627 ints_to_clear |= (DMAC_STS_RX_ | DMAC_STS_NIS_);
628 napi_schedule(&pd->napi);
629 }
630
631 if (ints_to_clear)
632 smsc9420_reg_write(pd, DMAC_STATUS, ints_to_clear);
633
634 ret = IRQ_HANDLED;
635 }
636
637 if (unlikely(INT_STAT_SW_INT_ & int_sts)) {
638 /* mask software interrupt */
639 spin_lock_irqsave(&pd->int_lock, flags);
640 int_ctl = smsc9420_reg_read(pd, INT_CTL);
641 int_ctl &= (~INT_CTL_SW_INT_EN_);
642 smsc9420_reg_write(pd, INT_CTL, int_ctl);
643 spin_unlock_irqrestore(&pd->int_lock, flags);
644
645 smsc9420_reg_write(pd, INT_STAT, INT_STAT_SW_INT_);
646 pd->software_irq_signal = true;
647 smp_wmb();
648
649 ret = IRQ_HANDLED;
650 }
651
652 /* to ensure PCI write completion, we must perform a PCI read */
653 smsc9420_pci_flush_write(pd);
654
655 return ret;
656 }
657
658 #ifdef CONFIG_NET_POLL_CONTROLLER
659 static void smsc9420_poll_controller(struct net_device *dev)
660 {
661 struct smsc9420_pdata *pd = netdev_priv(dev);
662 const int irq = pd->pdev->irq;
663
664 disable_irq(irq);
665 smsc9420_isr(0, dev);
666 enable_irq(irq);
667 }
668 #endif /* CONFIG_NET_POLL_CONTROLLER */
669
670 static void smsc9420_dmac_soft_reset(struct smsc9420_pdata *pd)
671 {
672 smsc9420_reg_write(pd, BUS_MODE, BUS_MODE_SWR_);
673 smsc9420_reg_read(pd, BUS_MODE);
674 udelay(2);
675 if (smsc9420_reg_read(pd, BUS_MODE) & BUS_MODE_SWR_)
676 netif_warn(pd, drv, pd->dev, "Software reset not cleared\n");
677 }
678
679 static int smsc9420_stop(struct net_device *dev)
680 {
681 struct smsc9420_pdata *pd = netdev_priv(dev);
682 u32 int_cfg;
683 ulong flags;
684
685 BUG_ON(!pd);
686 BUG_ON(!dev->phydev);
687
688 /* disable master interrupt */
689 spin_lock_irqsave(&pd->int_lock, flags);
690 int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
691 smsc9420_reg_write(pd, INT_CFG, int_cfg);
692 spin_unlock_irqrestore(&pd->int_lock, flags);
693
694 netif_tx_disable(dev);
695 napi_disable(&pd->napi);
696
697 smsc9420_stop_tx(pd);
698 smsc9420_free_tx_ring(pd);
699
700 smsc9420_stop_rx(pd);
701 smsc9420_free_rx_ring(pd);
702
703 free_irq(pd->pdev->irq, pd);
704
705 smsc9420_dmac_soft_reset(pd);
706
707 phy_stop(dev->phydev);
708
709 phy_disconnect(dev->phydev);
710 mdiobus_unregister(pd->mii_bus);
711 mdiobus_free(pd->mii_bus);
712
713 return 0;
714 }
715
716 static void smsc9420_rx_count_stats(struct net_device *dev, u32 desc_status)
717 {
718 if (unlikely(desc_status & RDES0_ERROR_SUMMARY_)) {
719 dev->stats.rx_errors++;
720 if (desc_status & RDES0_DESCRIPTOR_ERROR_)
721 dev->stats.rx_over_errors++;
722 else if (desc_status & (RDES0_FRAME_TOO_LONG_ |
723 RDES0_RUNT_FRAME_ | RDES0_COLLISION_SEEN_))
724 dev->stats.rx_frame_errors++;
725 else if (desc_status & RDES0_CRC_ERROR_)
726 dev->stats.rx_crc_errors++;
727 }
728
729 if (unlikely(desc_status & RDES0_LENGTH_ERROR_))
730 dev->stats.rx_length_errors++;
731
732 if (unlikely(!((desc_status & RDES0_LAST_DESCRIPTOR_) &&
733 (desc_status & RDES0_FIRST_DESCRIPTOR_))))
734 dev->stats.rx_length_errors++;
735
736 if (desc_status & RDES0_MULTICAST_FRAME_)
737 dev->stats.multicast++;
738 }
739
740 static void smsc9420_rx_handoff(struct smsc9420_pdata *pd, const int index,
741 const u32 status)
742 {
743 struct net_device *dev = pd->dev;
744 struct sk_buff *skb;
745 u16 packet_length = (status & RDES0_FRAME_LENGTH_MASK_)
746 >> RDES0_FRAME_LENGTH_SHFT_;
747
748 /* remove crc from packet lendth */
749 packet_length -= 4;
750
751 if (pd->rx_csum)
752 packet_length -= 2;
753
754 dev->stats.rx_packets++;
755 dev->stats.rx_bytes += packet_length;
756
757 dma_unmap_single(&pd->pdev->dev, pd->rx_buffers[index].mapping,
758 PKT_BUF_SZ, DMA_FROM_DEVICE);
759 pd->rx_buffers[index].mapping = 0;
760
761 skb = pd->rx_buffers[index].skb;
762 pd->rx_buffers[index].skb = NULL;
763
764 if (pd->rx_csum) {
765 u16 hw_csum = get_unaligned_le16(skb_tail_pointer(skb) +
766 NET_IP_ALIGN + packet_length + 4);
767 put_unaligned_le16(hw_csum, &skb->csum);
768 skb->ip_summed = CHECKSUM_COMPLETE;
769 }
770
771 skb_reserve(skb, NET_IP_ALIGN);
772 skb_put(skb, packet_length);
773
774 skb->protocol = eth_type_trans(skb, dev);
775
776 netif_receive_skb(skb);
777 }
778
779 static int smsc9420_alloc_rx_buffer(struct smsc9420_pdata *pd, int index)
780 {
781 struct sk_buff *skb = netdev_alloc_skb(pd->dev, PKT_BUF_SZ);
782 dma_addr_t mapping;
783
784 BUG_ON(pd->rx_buffers[index].skb);
785 BUG_ON(pd->rx_buffers[index].mapping);
786
787 if (unlikely(!skb))
788 return -ENOMEM;
789
790 mapping = dma_map_single(&pd->pdev->dev, skb_tail_pointer(skb),
791 PKT_BUF_SZ, DMA_FROM_DEVICE);
792 if (dma_mapping_error(&pd->pdev->dev, mapping)) {
793 dev_kfree_skb_any(skb);
794 netif_warn(pd, rx_err, pd->dev, "dma_map_single failed!\n");
795 return -ENOMEM;
796 }
797
798 pd->rx_buffers[index].skb = skb;
799 pd->rx_buffers[index].mapping = mapping;
800 pd->rx_ring[index].buffer1 = mapping + NET_IP_ALIGN;
801 pd->rx_ring[index].status = RDES0_OWN_;
802 wmb();
803
804 return 0;
805 }
806
807 static void smsc9420_alloc_new_rx_buffers(struct smsc9420_pdata *pd)
808 {
809 while (pd->rx_ring_tail != pd->rx_ring_head) {
810 if (smsc9420_alloc_rx_buffer(pd, pd->rx_ring_tail))
811 break;
812
813 pd->rx_ring_tail = (pd->rx_ring_tail + 1) % RX_RING_SIZE;
814 }
815 }
816
817 static int smsc9420_rx_poll(struct napi_struct *napi, int budget)
818 {
819 struct smsc9420_pdata *pd =
820 container_of(napi, struct smsc9420_pdata, napi);
821 struct net_device *dev = pd->dev;
822 u32 drop_frame_cnt, dma_intr_ena, status;
823 int work_done;
824
825 for (work_done = 0; work_done < budget; work_done++) {
826 rmb();
827 status = pd->rx_ring[pd->rx_ring_head].status;
828
829 /* stop if DMAC owns this dma descriptor */
830 if (status & RDES0_OWN_)
831 break;
832
833 smsc9420_rx_count_stats(dev, status);
834 smsc9420_rx_handoff(pd, pd->rx_ring_head, status);
835 pd->rx_ring_head = (pd->rx_ring_head + 1) % RX_RING_SIZE;
836 smsc9420_alloc_new_rx_buffers(pd);
837 }
838
839 drop_frame_cnt = smsc9420_reg_read(pd, MISS_FRAME_CNTR);
840 dev->stats.rx_dropped +=
841 (drop_frame_cnt & 0xFFFF) + ((drop_frame_cnt >> 17) & 0x3FF);
842
843 /* Kick RXDMA */
844 smsc9420_reg_write(pd, RX_POLL_DEMAND, 1);
845 smsc9420_pci_flush_write(pd);
846
847 if (work_done < budget) {
848 napi_complete_done(&pd->napi, work_done);
849
850 /* re-enable RX DMA interrupts */
851 dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
852 dma_intr_ena |= (DMAC_INTR_ENA_RX_ | DMAC_INTR_ENA_NIS_);
853 smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
854 smsc9420_pci_flush_write(pd);
855 }
856 return work_done;
857 }
858
859 static void
860 smsc9420_tx_update_stats(struct net_device *dev, u32 status, u32 length)
861 {
862 if (unlikely(status & TDES0_ERROR_SUMMARY_)) {
863 dev->stats.tx_errors++;
864 if (status & (TDES0_EXCESSIVE_DEFERRAL_ |
865 TDES0_EXCESSIVE_COLLISIONS_))
866 dev->stats.tx_aborted_errors++;
867
868 if (status & (TDES0_LOSS_OF_CARRIER_ | TDES0_NO_CARRIER_))
869 dev->stats.tx_carrier_errors++;
870 } else {
871 dev->stats.tx_packets++;
872 dev->stats.tx_bytes += (length & 0x7FF);
873 }
874
875 if (unlikely(status & TDES0_EXCESSIVE_COLLISIONS_)) {
876 dev->stats.collisions += 16;
877 } else {
878 dev->stats.collisions +=
879 (status & TDES0_COLLISION_COUNT_MASK_) >>
880 TDES0_COLLISION_COUNT_SHFT_;
881 }
882
883 if (unlikely(status & TDES0_HEARTBEAT_FAIL_))
884 dev->stats.tx_heartbeat_errors++;
885 }
886
887 /* Check for completed dma transfers, update stats and free skbs */
888 static void smsc9420_complete_tx(struct net_device *dev)
889 {
890 struct smsc9420_pdata *pd = netdev_priv(dev);
891
892 while (pd->tx_ring_tail != pd->tx_ring_head) {
893 int index = pd->tx_ring_tail;
894 u32 status, length;
895
896 rmb();
897 status = pd->tx_ring[index].status;
898 length = pd->tx_ring[index].length;
899
900 /* Check if DMA still owns this descriptor */
901 if (unlikely(TDES0_OWN_ & status))
902 break;
903
904 smsc9420_tx_update_stats(dev, status, length);
905
906 BUG_ON(!pd->tx_buffers[index].skb);
907 BUG_ON(!pd->tx_buffers[index].mapping);
908
909 dma_unmap_single(&pd->pdev->dev,
910 pd->tx_buffers[index].mapping,
911 pd->tx_buffers[index].skb->len,
912 DMA_TO_DEVICE);
913 pd->tx_buffers[index].mapping = 0;
914
915 dev_kfree_skb_any(pd->tx_buffers[index].skb);
916 pd->tx_buffers[index].skb = NULL;
917
918 pd->tx_ring[index].buffer1 = 0;
919 wmb();
920
921 pd->tx_ring_tail = (pd->tx_ring_tail + 1) % TX_RING_SIZE;
922 }
923 }
924
925 static netdev_tx_t smsc9420_hard_start_xmit(struct sk_buff *skb,
926 struct net_device *dev)
927 {
928 struct smsc9420_pdata *pd = netdev_priv(dev);
929 dma_addr_t mapping;
930 int index = pd->tx_ring_head;
931 u32 tmp_desc1;
932 bool about_to_take_last_desc =
933 (((pd->tx_ring_head + 2) % TX_RING_SIZE) == pd->tx_ring_tail);
934
935 smsc9420_complete_tx(dev);
936
937 rmb();
938 BUG_ON(pd->tx_ring[index].status & TDES0_OWN_);
939 BUG_ON(pd->tx_buffers[index].skb);
940 BUG_ON(pd->tx_buffers[index].mapping);
941
942 mapping = dma_map_single(&pd->pdev->dev, skb->data, skb->len,
943 DMA_TO_DEVICE);
944 if (dma_mapping_error(&pd->pdev->dev, mapping)) {
945 netif_warn(pd, tx_err, pd->dev,
946 "dma_map_single failed, dropping packet\n");
947 return NETDEV_TX_BUSY;
948 }
949
950 pd->tx_buffers[index].skb = skb;
951 pd->tx_buffers[index].mapping = mapping;
952
953 tmp_desc1 = (TDES1_LS_ | ((u32)skb->len & 0x7FF));
954 if (unlikely(about_to_take_last_desc)) {
955 tmp_desc1 |= TDES1_IC_;
956 netif_stop_queue(pd->dev);
957 }
958
959 /* check if we are at the last descriptor and need to set EOR */
960 if (unlikely(index == (TX_RING_SIZE - 1)))
961 tmp_desc1 |= TDES1_TER_;
962
963 pd->tx_ring[index].buffer1 = mapping;
964 pd->tx_ring[index].length = tmp_desc1;
965 wmb();
966
967 /* increment head */
968 pd->tx_ring_head = (pd->tx_ring_head + 1) % TX_RING_SIZE;
969
970 /* assign ownership to DMAC */
971 pd->tx_ring[index].status = TDES0_OWN_;
972 wmb();
973
974 skb_tx_timestamp(skb);
975
976 /* kick the DMA */
977 smsc9420_reg_write(pd, TX_POLL_DEMAND, 1);
978 smsc9420_pci_flush_write(pd);
979
980 return NETDEV_TX_OK;
981 }
982
983 static struct net_device_stats *smsc9420_get_stats(struct net_device *dev)
984 {
985 struct smsc9420_pdata *pd = netdev_priv(dev);
986 u32 counter = smsc9420_reg_read(pd, MISS_FRAME_CNTR);
987 dev->stats.rx_dropped +=
988 (counter & 0x0000FFFF) + ((counter >> 17) & 0x000003FF);
989 return &dev->stats;
990 }
991
992 static void smsc9420_set_multicast_list(struct net_device *dev)
993 {
994 struct smsc9420_pdata *pd = netdev_priv(dev);
995 u32 mac_cr = smsc9420_reg_read(pd, MAC_CR);
996
997 if (dev->flags & IFF_PROMISC) {
998 netif_dbg(pd, hw, pd->dev, "Promiscuous Mode Enabled\n");
999 mac_cr |= MAC_CR_PRMS_;
1000 mac_cr &= (~MAC_CR_MCPAS_);
1001 mac_cr &= (~MAC_CR_HPFILT_);
1002 } else if (dev->flags & IFF_ALLMULTI) {
1003 netif_dbg(pd, hw, pd->dev, "Receive all Multicast Enabled\n");
1004 mac_cr &= (~MAC_CR_PRMS_);
1005 mac_cr |= MAC_CR_MCPAS_;
1006 mac_cr &= (~MAC_CR_HPFILT_);
1007 } else if (!netdev_mc_empty(dev)) {
1008 struct netdev_hw_addr *ha;
1009 u32 hash_lo = 0, hash_hi = 0;
1010
1011 netif_dbg(pd, hw, pd->dev, "Multicast filter enabled\n");
1012 netdev_for_each_mc_addr(ha, dev) {
1013 u32 bit_num = smsc9420_hash(ha->addr);
1014 u32 mask = 1 << (bit_num & 0x1F);
1015
1016 if (bit_num & 0x20)
1017 hash_hi |= mask;
1018 else
1019 hash_lo |= mask;
1020
1021 }
1022 smsc9420_reg_write(pd, HASHH, hash_hi);
1023 smsc9420_reg_write(pd, HASHL, hash_lo);
1024
1025 mac_cr &= (~MAC_CR_PRMS_);
1026 mac_cr &= (~MAC_CR_MCPAS_);
1027 mac_cr |= MAC_CR_HPFILT_;
1028 } else {
1029 netif_dbg(pd, hw, pd->dev, "Receive own packets only\n");
1030 smsc9420_reg_write(pd, HASHH, 0);
1031 smsc9420_reg_write(pd, HASHL, 0);
1032
1033 mac_cr &= (~MAC_CR_PRMS_);
1034 mac_cr &= (~MAC_CR_MCPAS_);
1035 mac_cr &= (~MAC_CR_HPFILT_);
1036 }
1037
1038 smsc9420_reg_write(pd, MAC_CR, mac_cr);
1039 smsc9420_pci_flush_write(pd);
1040 }
1041
1042 static void smsc9420_phy_update_flowcontrol(struct smsc9420_pdata *pd)
1043 {
1044 struct net_device *dev = pd->dev;
1045 struct phy_device *phy_dev = dev->phydev;
1046 u32 flow;
1047
1048 if (phy_dev->duplex == DUPLEX_FULL) {
1049 u16 lcladv = phy_read(phy_dev, MII_ADVERTISE);
1050 u16 rmtadv = phy_read(phy_dev, MII_LPA);
1051 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
1052
1053 if (cap & FLOW_CTRL_RX)
1054 flow = 0xFFFF0002;
1055 else
1056 flow = 0;
1057
1058 netif_info(pd, link, pd->dev, "rx pause %s, tx pause %s\n",
1059 cap & FLOW_CTRL_RX ? "enabled" : "disabled",
1060 cap & FLOW_CTRL_TX ? "enabled" : "disabled");
1061 } else {
1062 netif_info(pd, link, pd->dev, "half duplex\n");
1063 flow = 0;
1064 }
1065
1066 smsc9420_reg_write(pd, FLOW, flow);
1067 }
1068
1069 /* Update link mode if anything has changed. Called periodically when the
1070 * PHY is in polling mode, even if nothing has changed. */
1071 static void smsc9420_phy_adjust_link(struct net_device *dev)
1072 {
1073 struct smsc9420_pdata *pd = netdev_priv(dev);
1074 struct phy_device *phy_dev = dev->phydev;
1075 int carrier;
1076
1077 if (phy_dev->duplex != pd->last_duplex) {
1078 u32 mac_cr = smsc9420_reg_read(pd, MAC_CR);
1079 if (phy_dev->duplex) {
1080 netif_dbg(pd, link, pd->dev, "full duplex mode\n");
1081 mac_cr |= MAC_CR_FDPX_;
1082 } else {
1083 netif_dbg(pd, link, pd->dev, "half duplex mode\n");
1084 mac_cr &= ~MAC_CR_FDPX_;
1085 }
1086 smsc9420_reg_write(pd, MAC_CR, mac_cr);
1087
1088 smsc9420_phy_update_flowcontrol(pd);
1089 pd->last_duplex = phy_dev->duplex;
1090 }
1091
1092 carrier = netif_carrier_ok(dev);
1093 if (carrier != pd->last_carrier) {
1094 if (carrier)
1095 netif_dbg(pd, link, pd->dev, "carrier OK\n");
1096 else
1097 netif_dbg(pd, link, pd->dev, "no carrier\n");
1098 pd->last_carrier = carrier;
1099 }
1100 }
1101
1102 static int smsc9420_mii_probe(struct net_device *dev)
1103 {
1104 struct smsc9420_pdata *pd = netdev_priv(dev);
1105 struct phy_device *phydev = NULL;
1106
1107 BUG_ON(dev->phydev);
1108
1109 /* Device only supports internal PHY at address 1 */
1110 phydev = mdiobus_get_phy(pd->mii_bus, 1);
1111 if (!phydev) {
1112 netdev_err(dev, "no PHY found at address 1\n");
1113 return -ENODEV;
1114 }
1115
1116 phydev = phy_connect(dev, phydev_name(phydev),
1117 smsc9420_phy_adjust_link, PHY_INTERFACE_MODE_MII);
1118
1119 if (IS_ERR(phydev)) {
1120 netdev_err(dev, "Could not attach to PHY\n");
1121 return PTR_ERR(phydev);
1122 }
1123
1124 phy_set_max_speed(phydev, SPEED_100);
1125
1126 /* mask with MAC supported features */
1127 phy_support_asym_pause(phydev);
1128
1129 phy_attached_info(phydev);
1130
1131 pd->last_duplex = -1;
1132 pd->last_carrier = -1;
1133
1134 return 0;
1135 }
1136
1137 static int smsc9420_mii_init(struct net_device *dev)
1138 {
1139 struct smsc9420_pdata *pd = netdev_priv(dev);
1140 int err = -ENXIO;
1141
1142 pd->mii_bus = mdiobus_alloc();
1143 if (!pd->mii_bus) {
1144 err = -ENOMEM;
1145 goto err_out_1;
1146 }
1147 pd->mii_bus->name = DRV_MDIONAME;
1148 snprintf(pd->mii_bus->id, MII_BUS_ID_SIZE, "%x", pci_dev_id(pd->pdev));
1149 pd->mii_bus->priv = pd;
1150 pd->mii_bus->read = smsc9420_mii_read;
1151 pd->mii_bus->write = smsc9420_mii_write;
1152
1153 /* Mask all PHYs except ID 1 (internal) */
1154 pd->mii_bus->phy_mask = ~(1 << 1);
1155
1156 if (mdiobus_register(pd->mii_bus)) {
1157 netif_warn(pd, probe, pd->dev, "Error registering mii bus\n");
1158 goto err_out_free_bus_2;
1159 }
1160
1161 if (smsc9420_mii_probe(dev) < 0) {
1162 netif_warn(pd, probe, pd->dev, "Error probing mii bus\n");
1163 goto err_out_unregister_bus_3;
1164 }
1165
1166 return 0;
1167
1168 err_out_unregister_bus_3:
1169 mdiobus_unregister(pd->mii_bus);
1170 err_out_free_bus_2:
1171 mdiobus_free(pd->mii_bus);
1172 err_out_1:
1173 return err;
1174 }
1175
1176 static int smsc9420_alloc_tx_ring(struct smsc9420_pdata *pd)
1177 {
1178 int i;
1179
1180 BUG_ON(!pd->tx_ring);
1181
1182 pd->tx_buffers = kmalloc_array(TX_RING_SIZE,
1183 sizeof(struct smsc9420_ring_info),
1184 GFP_KERNEL);
1185 if (!pd->tx_buffers)
1186 return -ENOMEM;
1187
1188 /* Initialize the TX Ring */
1189 for (i = 0; i < TX_RING_SIZE; i++) {
1190 pd->tx_buffers[i].skb = NULL;
1191 pd->tx_buffers[i].mapping = 0;
1192 pd->tx_ring[i].status = 0;
1193 pd->tx_ring[i].length = 0;
1194 pd->tx_ring[i].buffer1 = 0;
1195 pd->tx_ring[i].buffer2 = 0;
1196 }
1197 pd->tx_ring[TX_RING_SIZE - 1].length = TDES1_TER_;
1198 wmb();
1199
1200 pd->tx_ring_head = 0;
1201 pd->tx_ring_tail = 0;
1202
1203 smsc9420_reg_write(pd, TX_BASE_ADDR, pd->tx_dma_addr);
1204 smsc9420_pci_flush_write(pd);
1205
1206 return 0;
1207 }
1208
1209 static int smsc9420_alloc_rx_ring(struct smsc9420_pdata *pd)
1210 {
1211 int i;
1212
1213 BUG_ON(!pd->rx_ring);
1214
1215 pd->rx_buffers = kmalloc_array(RX_RING_SIZE,
1216 sizeof(struct smsc9420_ring_info),
1217 GFP_KERNEL);
1218 if (pd->rx_buffers == NULL)
1219 goto out;
1220
1221 /* initialize the rx ring */
1222 for (i = 0; i < RX_RING_SIZE; i++) {
1223 pd->rx_ring[i].status = 0;
1224 pd->rx_ring[i].length = PKT_BUF_SZ;
1225 pd->rx_ring[i].buffer2 = 0;
1226 pd->rx_buffers[i].skb = NULL;
1227 pd->rx_buffers[i].mapping = 0;
1228 }
1229 pd->rx_ring[RX_RING_SIZE - 1].length = (PKT_BUF_SZ | RDES1_RER_);
1230
1231 /* now allocate the entire ring of skbs */
1232 for (i = 0; i < RX_RING_SIZE; i++) {
1233 if (smsc9420_alloc_rx_buffer(pd, i)) {
1234 netif_warn(pd, ifup, pd->dev,
1235 "failed to allocate rx skb %d\n", i);
1236 goto out_free_rx_skbs;
1237 }
1238 }
1239
1240 pd->rx_ring_head = 0;
1241 pd->rx_ring_tail = 0;
1242
1243 smsc9420_reg_write(pd, VLAN1, ETH_P_8021Q);
1244 netif_dbg(pd, ifup, pd->dev, "VLAN1 = 0x%08x\n",
1245 smsc9420_reg_read(pd, VLAN1));
1246
1247 if (pd->rx_csum) {
1248 /* Enable RX COE */
1249 u32 coe = smsc9420_reg_read(pd, COE_CR) | RX_COE_EN;
1250 smsc9420_reg_write(pd, COE_CR, coe);
1251 netif_dbg(pd, ifup, pd->dev, "COE_CR = 0x%08x\n", coe);
1252 }
1253
1254 smsc9420_reg_write(pd, RX_BASE_ADDR, pd->rx_dma_addr);
1255 smsc9420_pci_flush_write(pd);
1256
1257 return 0;
1258
1259 out_free_rx_skbs:
1260 smsc9420_free_rx_ring(pd);
1261 out:
1262 return -ENOMEM;
1263 }
1264
1265 static int smsc9420_open(struct net_device *dev)
1266 {
1267 struct smsc9420_pdata *pd = netdev_priv(dev);
1268 u32 bus_mode, mac_cr, dmac_control, int_cfg, dma_intr_ena, int_ctl;
1269 const int irq = pd->pdev->irq;
1270 unsigned long flags;
1271 int result = 0, timeout;
1272
1273 if (!is_valid_ether_addr(dev->dev_addr)) {
1274 netif_warn(pd, ifup, pd->dev,
1275 "dev_addr is not a valid MAC address\n");
1276 result = -EADDRNOTAVAIL;
1277 goto out_0;
1278 }
1279
1280 netif_carrier_off(dev);
1281
1282 /* disable, mask and acknowledge all interrupts */
1283 spin_lock_irqsave(&pd->int_lock, flags);
1284 int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
1285 smsc9420_reg_write(pd, INT_CFG, int_cfg);
1286 smsc9420_reg_write(pd, INT_CTL, 0);
1287 spin_unlock_irqrestore(&pd->int_lock, flags);
1288 smsc9420_reg_write(pd, DMAC_INTR_ENA, 0);
1289 smsc9420_reg_write(pd, INT_STAT, 0xFFFFFFFF);
1290 smsc9420_pci_flush_write(pd);
1291
1292 result = request_irq(irq, smsc9420_isr, IRQF_SHARED, DRV_NAME, pd);
1293 if (result) {
1294 netif_warn(pd, ifup, pd->dev, "Unable to use IRQ = %d\n", irq);
1295 result = -ENODEV;
1296 goto out_0;
1297 }
1298
1299 smsc9420_dmac_soft_reset(pd);
1300
1301 /* make sure MAC_CR is sane */
1302 smsc9420_reg_write(pd, MAC_CR, 0);
1303
1304 smsc9420_set_mac_address(dev);
1305
1306 /* Configure GPIO pins to drive LEDs */
1307 smsc9420_reg_write(pd, GPIO_CFG,
1308 (GPIO_CFG_LED_3_ | GPIO_CFG_LED_2_ | GPIO_CFG_LED_1_));
1309
1310 bus_mode = BUS_MODE_DMA_BURST_LENGTH_16;
1311
1312 #ifdef __BIG_ENDIAN
1313 bus_mode |= BUS_MODE_DBO_;
1314 #endif
1315
1316 smsc9420_reg_write(pd, BUS_MODE, bus_mode);
1317
1318 smsc9420_pci_flush_write(pd);
1319
1320 /* set bus master bridge arbitration priority for Rx and TX DMA */
1321 smsc9420_reg_write(pd, BUS_CFG, BUS_CFG_RXTXWEIGHT_4_1);
1322
1323 smsc9420_reg_write(pd, DMAC_CONTROL,
1324 (DMAC_CONTROL_SF_ | DMAC_CONTROL_OSF_));
1325
1326 smsc9420_pci_flush_write(pd);
1327
1328 /* test the IRQ connection to the ISR */
1329 netif_dbg(pd, ifup, pd->dev, "Testing ISR using IRQ %d\n", irq);
1330 pd->software_irq_signal = false;
1331
1332 spin_lock_irqsave(&pd->int_lock, flags);
1333 /* configure interrupt deassertion timer and enable interrupts */
1334 int_cfg = smsc9420_reg_read(pd, INT_CFG) | INT_CFG_IRQ_EN_;
1335 int_cfg &= ~(INT_CFG_INT_DEAS_MASK);
1336 int_cfg |= (INT_DEAS_TIME & INT_CFG_INT_DEAS_MASK);
1337 smsc9420_reg_write(pd, INT_CFG, int_cfg);
1338
1339 /* unmask software interrupt */
1340 int_ctl = smsc9420_reg_read(pd, INT_CTL) | INT_CTL_SW_INT_EN_;
1341 smsc9420_reg_write(pd, INT_CTL, int_ctl);
1342 spin_unlock_irqrestore(&pd->int_lock, flags);
1343 smsc9420_pci_flush_write(pd);
1344
1345 timeout = 1000;
1346 while (timeout--) {
1347 if (pd->software_irq_signal)
1348 break;
1349 msleep(1);
1350 }
1351
1352 /* disable interrupts */
1353 spin_lock_irqsave(&pd->int_lock, flags);
1354 int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
1355 smsc9420_reg_write(pd, INT_CFG, int_cfg);
1356 spin_unlock_irqrestore(&pd->int_lock, flags);
1357
1358 if (!pd->software_irq_signal) {
1359 netif_warn(pd, ifup, pd->dev, "ISR failed signaling test\n");
1360 result = -ENODEV;
1361 goto out_free_irq_1;
1362 }
1363
1364 netif_dbg(pd, ifup, pd->dev, "ISR passed test using IRQ %d\n", irq);
1365
1366 result = smsc9420_alloc_tx_ring(pd);
1367 if (result) {
1368 netif_warn(pd, ifup, pd->dev,
1369 "Failed to Initialize tx dma ring\n");
1370 result = -ENOMEM;
1371 goto out_free_irq_1;
1372 }
1373
1374 result = smsc9420_alloc_rx_ring(pd);
1375 if (result) {
1376 netif_warn(pd, ifup, pd->dev,
1377 "Failed to Initialize rx dma ring\n");
1378 result = -ENOMEM;
1379 goto out_free_tx_ring_2;
1380 }
1381
1382 result = smsc9420_mii_init(dev);
1383 if (result) {
1384 netif_warn(pd, ifup, pd->dev, "Failed to initialize Phy\n");
1385 result = -ENODEV;
1386 goto out_free_rx_ring_3;
1387 }
1388
1389 /* Bring the PHY up */
1390 phy_start(dev->phydev);
1391
1392 napi_enable(&pd->napi);
1393
1394 /* start tx and rx */
1395 mac_cr = smsc9420_reg_read(pd, MAC_CR) | MAC_CR_TXEN_ | MAC_CR_RXEN_;
1396 smsc9420_reg_write(pd, MAC_CR, mac_cr);
1397
1398 dmac_control = smsc9420_reg_read(pd, DMAC_CONTROL);
1399 dmac_control |= DMAC_CONTROL_ST_ | DMAC_CONTROL_SR_;
1400 smsc9420_reg_write(pd, DMAC_CONTROL, dmac_control);
1401 smsc9420_pci_flush_write(pd);
1402
1403 dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
1404 dma_intr_ena |=
1405 (DMAC_INTR_ENA_TX_ | DMAC_INTR_ENA_RX_ | DMAC_INTR_ENA_NIS_);
1406 smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
1407 smsc9420_pci_flush_write(pd);
1408
1409 netif_wake_queue(dev);
1410
1411 smsc9420_reg_write(pd, RX_POLL_DEMAND, 1);
1412
1413 /* enable interrupts */
1414 spin_lock_irqsave(&pd->int_lock, flags);
1415 int_cfg = smsc9420_reg_read(pd, INT_CFG) | INT_CFG_IRQ_EN_;
1416 smsc9420_reg_write(pd, INT_CFG, int_cfg);
1417 spin_unlock_irqrestore(&pd->int_lock, flags);
1418
1419 return 0;
1420
1421 out_free_rx_ring_3:
1422 smsc9420_free_rx_ring(pd);
1423 out_free_tx_ring_2:
1424 smsc9420_free_tx_ring(pd);
1425 out_free_irq_1:
1426 free_irq(irq, pd);
1427 out_0:
1428 return result;
1429 }
1430
1431 static int __maybe_unused smsc9420_suspend(struct device *dev_d)
1432 {
1433 struct net_device *dev = dev_get_drvdata(dev_d);
1434 struct smsc9420_pdata *pd = netdev_priv(dev);
1435 u32 int_cfg;
1436 ulong flags;
1437
1438 /* disable interrupts */
1439 spin_lock_irqsave(&pd->int_lock, flags);
1440 int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
1441 smsc9420_reg_write(pd, INT_CFG, int_cfg);
1442 spin_unlock_irqrestore(&pd->int_lock, flags);
1443
1444 if (netif_running(dev)) {
1445 netif_tx_disable(dev);
1446 smsc9420_stop_tx(pd);
1447 smsc9420_free_tx_ring(pd);
1448
1449 napi_disable(&pd->napi);
1450 smsc9420_stop_rx(pd);
1451 smsc9420_free_rx_ring(pd);
1452
1453 free_irq(pd->pdev->irq, pd);
1454
1455 netif_device_detach(dev);
1456 }
1457
1458 device_wakeup_disable(dev_d);
1459
1460 return 0;
1461 }
1462
1463 static int __maybe_unused smsc9420_resume(struct device *dev_d)
1464 {
1465 struct net_device *dev = dev_get_drvdata(dev_d);
1466 int err;
1467
1468 pci_set_master(to_pci_dev(dev_d));
1469
1470 device_wakeup_disable(dev_d);
1471
1472 err = 0;
1473 if (netif_running(dev)) {
1474 /* FIXME: gross. It looks like ancient PM relic.*/
1475 err = smsc9420_open(dev);
1476 netif_device_attach(dev);
1477 }
1478 return err;
1479 }
1480
1481 static const struct net_device_ops smsc9420_netdev_ops = {
1482 .ndo_open = smsc9420_open,
1483 .ndo_stop = smsc9420_stop,
1484 .ndo_start_xmit = smsc9420_hard_start_xmit,
1485 .ndo_get_stats = smsc9420_get_stats,
1486 .ndo_set_rx_mode = smsc9420_set_multicast_list,
1487 .ndo_eth_ioctl = phy_do_ioctl_running,
1488 .ndo_validate_addr = eth_validate_addr,
1489 .ndo_set_mac_address = eth_mac_addr,
1490 #ifdef CONFIG_NET_POLL_CONTROLLER
1491 .ndo_poll_controller = smsc9420_poll_controller,
1492 #endif /* CONFIG_NET_POLL_CONTROLLER */
1493 };
1494
1495 static int
1496 smsc9420_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1497 {
1498 struct net_device *dev;
1499 struct smsc9420_pdata *pd;
1500 void __iomem *virt_addr;
1501 int result = 0;
1502 u32 id_rev;
1503
1504 pr_info("%s version %s\n", DRV_DESCRIPTION, DRV_VERSION);
1505
1506 /* First do the PCI initialisation */
1507 result = pci_enable_device(pdev);
1508 if (unlikely(result)) {
1509 pr_err("Cannot enable smsc9420\n");
1510 goto out_0;
1511 }
1512
1513 pci_set_master(pdev);
1514
1515 dev = alloc_etherdev(sizeof(*pd));
1516 if (!dev)
1517 goto out_disable_pci_device_1;
1518
1519 SET_NETDEV_DEV(dev, &pdev->dev);
1520
1521 if (!(pci_resource_flags(pdev, SMSC_BAR) & IORESOURCE_MEM)) {
1522 netdev_err(dev, "Cannot find PCI device base address\n");
1523 goto out_free_netdev_2;
1524 }
1525
1526 if ((pci_request_regions(pdev, DRV_NAME))) {
1527 netdev_err(dev, "Cannot obtain PCI resources, aborting\n");
1528 goto out_free_netdev_2;
1529 }
1530
1531 if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
1532 netdev_err(dev, "No usable DMA configuration, aborting\n");
1533 goto out_free_regions_3;
1534 }
1535
1536 virt_addr = ioremap(pci_resource_start(pdev, SMSC_BAR),
1537 pci_resource_len(pdev, SMSC_BAR));
1538 if (!virt_addr) {
1539 netdev_err(dev, "Cannot map device registers, aborting\n");
1540 goto out_free_regions_3;
1541 }
1542
1543 /* registers are double mapped with 0 offset for LE and 0x200 for BE */
1544 virt_addr += LAN9420_CPSR_ENDIAN_OFFSET;
1545
1546 pd = netdev_priv(dev);
1547
1548 /* pci descriptors are created in the PCI consistent area */
1549 pd->rx_ring = dma_alloc_coherent(&pdev->dev,
1550 sizeof(struct smsc9420_dma_desc) * (RX_RING_SIZE + TX_RING_SIZE),
1551 &pd->rx_dma_addr, GFP_KERNEL);
1552
1553 if (!pd->rx_ring)
1554 goto out_free_io_4;
1555
1556 /* descriptors are aligned due to the nature of dma_alloc_coherent */
1557 pd->tx_ring = (pd->rx_ring + RX_RING_SIZE);
1558 pd->tx_dma_addr = pd->rx_dma_addr +
1559 sizeof(struct smsc9420_dma_desc) * RX_RING_SIZE;
1560
1561 pd->pdev = pdev;
1562 pd->dev = dev;
1563 pd->ioaddr = virt_addr;
1564 pd->msg_enable = smsc_debug;
1565 pd->rx_csum = true;
1566
1567 netif_dbg(pd, probe, pd->dev, "lan_base=0x%08lx\n", (ulong)virt_addr);
1568
1569 id_rev = smsc9420_reg_read(pd, ID_REV);
1570 switch (id_rev & 0xFFFF0000) {
1571 case 0x94200000:
1572 netif_info(pd, probe, pd->dev,
1573 "LAN9420 identified, ID_REV=0x%08X\n", id_rev);
1574 break;
1575 default:
1576 netif_warn(pd, probe, pd->dev, "LAN9420 NOT identified\n");
1577 netif_warn(pd, probe, pd->dev, "ID_REV=0x%08X\n", id_rev);
1578 goto out_free_dmadesc_5;
1579 }
1580
1581 smsc9420_dmac_soft_reset(pd);
1582 smsc9420_eeprom_reload(pd);
1583 smsc9420_check_mac_address(dev);
1584
1585 dev->netdev_ops = &smsc9420_netdev_ops;
1586 dev->ethtool_ops = &smsc9420_ethtool_ops;
1587
1588 netif_napi_add(dev, &pd->napi, smsc9420_rx_poll);
1589
1590 result = register_netdev(dev);
1591 if (result) {
1592 netif_warn(pd, probe, pd->dev, "error %i registering device\n",
1593 result);
1594 goto out_free_dmadesc_5;
1595 }
1596
1597 pci_set_drvdata(pdev, dev);
1598
1599 spin_lock_init(&pd->int_lock);
1600 spin_lock_init(&pd->phy_lock);
1601
1602 dev_info(&dev->dev, "MAC Address: %pM\n", dev->dev_addr);
1603
1604 return 0;
1605
1606 out_free_dmadesc_5:
1607 dma_free_coherent(&pdev->dev,
1608 sizeof(struct smsc9420_dma_desc) * (RX_RING_SIZE + TX_RING_SIZE),
1609 pd->rx_ring, pd->rx_dma_addr);
1610 out_free_io_4:
1611 iounmap(virt_addr - LAN9420_CPSR_ENDIAN_OFFSET);
1612 out_free_regions_3:
1613 pci_release_regions(pdev);
1614 out_free_netdev_2:
1615 free_netdev(dev);
1616 out_disable_pci_device_1:
1617 pci_disable_device(pdev);
1618 out_0:
1619 return -ENODEV;
1620 }
1621
1622 static void smsc9420_remove(struct pci_dev *pdev)
1623 {
1624 struct net_device *dev;
1625 struct smsc9420_pdata *pd;
1626
1627 dev = pci_get_drvdata(pdev);
1628 if (!dev)
1629 return;
1630
1631 pd = netdev_priv(dev);
1632 unregister_netdev(dev);
1633
1634 /* tx_buffers and rx_buffers are freed in stop */
1635 BUG_ON(pd->tx_buffers);
1636 BUG_ON(pd->rx_buffers);
1637
1638 BUG_ON(!pd->tx_ring);
1639 BUG_ON(!pd->rx_ring);
1640
1641 dma_free_coherent(&pdev->dev,
1642 sizeof(struct smsc9420_dma_desc) * (RX_RING_SIZE + TX_RING_SIZE),
1643 pd->rx_ring, pd->rx_dma_addr);
1644
1645 iounmap(pd->ioaddr - LAN9420_CPSR_ENDIAN_OFFSET);
1646 pci_release_regions(pdev);
1647 free_netdev(dev);
1648 pci_disable_device(pdev);
1649 }
1650
1651 static SIMPLE_DEV_PM_OPS(smsc9420_pm_ops, smsc9420_suspend, smsc9420_resume);
1652
1653 static struct pci_driver smsc9420_driver = {
1654 .name = DRV_NAME,
1655 .id_table = smsc9420_id_table,
1656 .probe = smsc9420_probe,
1657 .remove = smsc9420_remove,
1658 .driver.pm = &smsc9420_pm_ops,
1659 };
1660
1661 static int __init smsc9420_init_module(void)
1662 {
1663 smsc_debug = netif_msg_init(debug, SMSC_MSG_DEFAULT);
1664
1665 return pci_register_driver(&smsc9420_driver);
1666 }
1667
1668 static void __exit smsc9420_exit_module(void)
1669 {
1670 pci_unregister_driver(&smsc9420_driver);
1671 }
1672
1673 module_init(smsc9420_init_module);
1674 module_exit(smsc9420_exit_module);
Kernel DRM miscellaneous fixes and cross-tree changes