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x86: fix bootup crash in native_read_tsc()
[wrt350n-kernel.git] / drivers / net / ibm_emac / ibm_emac_core.c
blob73664f226f323b8850d7292ff65fe7f14571d14a
1 /*
2 * drivers/net/ibm_emac/ibm_emac_core.c
3 *
4 * Driver for PowerPC 4xx on-chip ethernet controller.
5 *
6 * Copyright (c) 2004, 2005 Zultys Technologies.
7 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
8 *
9 * Based on original work by
10 * Matt Porter <mporter@kernel.crashing.org>
11 * (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
12 * Armin Kuster <akuster@mvista.com>
13 * Johnnie Peters <jpeters@mvista.com>
14 *
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
19 *
20 */
21
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/string.h>
25 #include <linux/errno.h>
26 #include <linux/interrupt.h>
27 #include <linux/delay.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/skbuff.h>
33 #include <linux/crc32.h>
34 #include <linux/ethtool.h>
35 #include <linux/mii.h>
36 #include <linux/bitops.h>
37
38 #include <asm/processor.h>
39 #include <asm/io.h>
40 #include <asm/dma.h>
41 #include <asm/uaccess.h>
42 #include <asm/ocp.h>
43
44 #include "ibm_emac_core.h"
45 #include "ibm_emac_debug.h"
46
47 /*
48 * Lack of dma_unmap_???? calls is intentional.
49 *
50 * API-correct usage requires additional support state information to be
51 * maintained for every RX and TX buffer descriptor (BD). Unfortunately, due to
52 * EMAC design (e.g. TX buffer passed from network stack can be split into
53 * several BDs, dma_map_single/dma_map_page can be used to map particular BD),
54 * maintaining such information will add additional overhead.
55 * Current DMA API implementation for 4xx processors only ensures cache coherency
56 * and dma_unmap_???? routines are empty and are likely to stay this way.
57 * I decided to omit dma_unmap_??? calls because I don't want to add additional
58 * complexity just for the sake of following some abstract API, when it doesn't
59 * add any real benefit to the driver. I understand that this decision maybe
60 * controversial, but I really tried to make code API-correct and efficient
61 * at the same time and didn't come up with code I liked :(. --ebs
62 */
63
64 #define DRV_NAME "emac"
65 #define DRV_VERSION "3.54"
66 #define DRV_DESC "PPC 4xx OCP EMAC driver"
67
68 MODULE_DESCRIPTION(DRV_DESC);
69 MODULE_AUTHOR
70 ("Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>");
71 MODULE_LICENSE("GPL");
72
73 /* minimum number of free TX descriptors required to wake up TX process */
74 #define EMAC_TX_WAKEUP_THRESH (NUM_TX_BUFF / 4)
75
76 /* If packet size is less than this number, we allocate small skb and copy packet
77 * contents into it instead of just sending original big skb up
78 */
79 #define EMAC_RX_COPY_THRESH CONFIG_IBM_EMAC_RX_COPY_THRESHOLD
80
81 /* Since multiple EMACs share MDIO lines in various ways, we need
82 * to avoid re-using the same PHY ID in cases where the arch didn't
83 * setup precise phy_map entries
84 */
85 static u32 busy_phy_map;
86
87 #if defined(CONFIG_IBM_EMAC_PHY_RX_CLK_FIX) && \
88 (defined(CONFIG_405EP) || defined(CONFIG_440EP) || defined(CONFIG_440GR))
89 /* 405EP has "EMAC to PHY Control Register" (CPC0_EPCTL) which can help us
90 * with PHY RX clock problem.
91 * 440EP/440GR has more sane SDR0_MFR register implementation than 440GX, which
92 * also allows controlling each EMAC clock
93 */
94 static inline void EMAC_RX_CLK_TX(int idx)
95 {
96 unsigned long flags;
97 local_irq_save(flags);
98
99 #if defined(CONFIG_405EP)
100 mtdcr(0xf3, mfdcr(0xf3) | (1 << idx));
101 #else /* CONFIG_440EP || CONFIG_440GR */
102 SDR_WRITE(DCRN_SDR_MFR, SDR_READ(DCRN_SDR_MFR) | (0x08000000 >> idx));
103 #endif
104
105 local_irq_restore(flags);
106 }
107
108 static inline void EMAC_RX_CLK_DEFAULT(int idx)
109 {
110 unsigned long flags;
111 local_irq_save(flags);
112
113 #if defined(CONFIG_405EP)
114 mtdcr(0xf3, mfdcr(0xf3) & ~(1 << idx));
115 #else /* CONFIG_440EP */
116 SDR_WRITE(DCRN_SDR_MFR, SDR_READ(DCRN_SDR_MFR) & ~(0x08000000 >> idx));
117 #endif
118
119 local_irq_restore(flags);
120 }
121 #else
122 #define EMAC_RX_CLK_TX(idx) ((void)0)
123 #define EMAC_RX_CLK_DEFAULT(idx) ((void)0)
124 #endif
125
126 #if defined(CONFIG_IBM_EMAC_PHY_RX_CLK_FIX) && defined(CONFIG_440GX)
127 /* We can switch Ethernet clock to the internal source through SDR0_MFR[ECS],
128 * unfortunately this is less flexible than 440EP case, because it's a global
129 * setting for all EMACs, therefore we do this clock trick only during probe.
130 */
131 #define EMAC_CLK_INTERNAL SDR_WRITE(DCRN_SDR_MFR, \
132 SDR_READ(DCRN_SDR_MFR) | 0x08000000)
133 #define EMAC_CLK_EXTERNAL SDR_WRITE(DCRN_SDR_MFR, \
134 SDR_READ(DCRN_SDR_MFR) & ~0x08000000)
135 #else
136 #define EMAC_CLK_INTERNAL ((void)0)
137 #define EMAC_CLK_EXTERNAL ((void)0)
138 #endif
139
140 /* I don't want to litter system log with timeout errors
141 * when we have brain-damaged PHY.
142 */
143 static inline void emac_report_timeout_error(struct ocp_enet_private *dev,
144 const char *error)
145 {
146 #if defined(CONFIG_IBM_EMAC_PHY_RX_CLK_FIX)
147 DBG("%d: %s" NL, dev->def->index, error);
148 #else
149 if (net_ratelimit())
150 printk(KERN_ERR "emac%d: %s\n", dev->def->index, error);
151 #endif
152 }
153
154 /* PHY polling intervals */
155 #define PHY_POLL_LINK_ON HZ
156 #define PHY_POLL_LINK_OFF (HZ / 5)
157
158 /* Graceful stop timeouts in us.
159 * We should allow up to 1 frame time (full-duplex, ignoring collisions)
160 */
161 #define STOP_TIMEOUT_10 1230
162 #define STOP_TIMEOUT_100 124
163 #define STOP_TIMEOUT_1000 13
164 #define STOP_TIMEOUT_1000_JUMBO 73
165
166 /* Please, keep in sync with struct ibm_emac_stats/ibm_emac_error_stats */
167 static const char emac_stats_keys[EMAC_ETHTOOL_STATS_COUNT][ETH_GSTRING_LEN] = {
168 "rx_packets", "rx_bytes", "tx_packets", "tx_bytes", "rx_packets_csum",
169 "tx_packets_csum", "tx_undo", "rx_dropped_stack", "rx_dropped_oom",
170 "rx_dropped_error", "rx_dropped_resize", "rx_dropped_mtu",
171 "rx_stopped", "rx_bd_errors", "rx_bd_overrun", "rx_bd_bad_packet",
172 "rx_bd_runt_packet", "rx_bd_short_event", "rx_bd_alignment_error",
173 "rx_bd_bad_fcs", "rx_bd_packet_too_long", "rx_bd_out_of_range",
174 "rx_bd_in_range", "rx_parity", "rx_fifo_overrun", "rx_overrun",
175 "rx_bad_packet", "rx_runt_packet", "rx_short_event",
176 "rx_alignment_error", "rx_bad_fcs", "rx_packet_too_long",
177 "rx_out_of_range", "rx_in_range", "tx_dropped", "tx_bd_errors",
178 "tx_bd_bad_fcs", "tx_bd_carrier_loss", "tx_bd_excessive_deferral",
179 "tx_bd_excessive_collisions", "tx_bd_late_collision",
180 "tx_bd_multple_collisions", "tx_bd_single_collision",
181 "tx_bd_underrun", "tx_bd_sqe", "tx_parity", "tx_underrun", "tx_sqe",
182 "tx_errors"
183 };
184
185 static irqreturn_t emac_irq(int irq, void *dev_instance);
186 static void emac_clean_tx_ring(struct ocp_enet_private *dev);
187
188 static inline int emac_phy_supports_gige(int phy_mode)
189 {
190 return phy_mode == PHY_MODE_GMII ||
191 phy_mode == PHY_MODE_RGMII ||
192 phy_mode == PHY_MODE_TBI ||
193 phy_mode == PHY_MODE_RTBI;
194 }
195
196 static inline int emac_phy_gpcs(int phy_mode)
197 {
198 return phy_mode == PHY_MODE_TBI ||
199 phy_mode == PHY_MODE_RTBI;
200 }
201
202 static inline void emac_tx_enable(struct ocp_enet_private *dev)
203 {
204 struct emac_regs __iomem *p = dev->emacp;
205 unsigned long flags;
206 u32 r;
207
208 local_irq_save(flags);
209
210 DBG("%d: tx_enable" NL, dev->def->index);
211
212 r = in_be32(&p->mr0);
213 if (!(r & EMAC_MR0_TXE))
214 out_be32(&p->mr0, r | EMAC_MR0_TXE);
215 local_irq_restore(flags);
216 }
217
218 static void emac_tx_disable(struct ocp_enet_private *dev)
219 {
220 struct emac_regs __iomem *p = dev->emacp;
221 unsigned long flags;
222 u32 r;
223
224 local_irq_save(flags);
225
226 DBG("%d: tx_disable" NL, dev->def->index);
227
228 r = in_be32(&p->mr0);
229 if (r & EMAC_MR0_TXE) {
230 int n = dev->stop_timeout;
231 out_be32(&p->mr0, r & ~EMAC_MR0_TXE);
232 while (!(in_be32(&p->mr0) & EMAC_MR0_TXI) && n) {
233 udelay(1);
234 --n;
235 }
236 if (unlikely(!n))
237 emac_report_timeout_error(dev, "TX disable timeout");
238 }
239 local_irq_restore(flags);
240 }
241
242 static void emac_rx_enable(struct ocp_enet_private *dev)
243 {
244 struct emac_regs __iomem *p = dev->emacp;
245 unsigned long flags;
246 u32 r;
247
248 local_irq_save(flags);
249 if (unlikely(dev->commac.rx_stopped))
250 goto out;
251
252 DBG("%d: rx_enable" NL, dev->def->index);
253
254 r = in_be32(&p->mr0);
255 if (!(r & EMAC_MR0_RXE)) {
256 if (unlikely(!(r & EMAC_MR0_RXI))) {
257 /* Wait if previous async disable is still in progress */
258 int n = dev->stop_timeout;
259 while (!(r = in_be32(&p->mr0) & EMAC_MR0_RXI) && n) {
260 udelay(1);
261 --n;
262 }
263 if (unlikely(!n))
264 emac_report_timeout_error(dev,
265 "RX disable timeout");
266 }
267 out_be32(&p->mr0, r | EMAC_MR0_RXE);
268 }
269 out:
270 local_irq_restore(flags);
271 }
272
273 static void emac_rx_disable(struct ocp_enet_private *dev)
274 {
275 struct emac_regs __iomem *p = dev->emacp;
276 unsigned long flags;
277 u32 r;
278
279 local_irq_save(flags);
280
281 DBG("%d: rx_disable" NL, dev->def->index);
282
283 r = in_be32(&p->mr0);
284 if (r & EMAC_MR0_RXE) {
285 int n = dev->stop_timeout;
286 out_be32(&p->mr0, r & ~EMAC_MR0_RXE);
287 while (!(in_be32(&p->mr0) & EMAC_MR0_RXI) && n) {
288 udelay(1);
289 --n;
290 }
291 if (unlikely(!n))
292 emac_report_timeout_error(dev, "RX disable timeout");
293 }
294 local_irq_restore(flags);
295 }
296
297 static inline void emac_rx_disable_async(struct ocp_enet_private *dev)
298 {
299 struct emac_regs __iomem *p = dev->emacp;
300 unsigned long flags;
301 u32 r;
302
303 local_irq_save(flags);
304
305 DBG("%d: rx_disable_async" NL, dev->def->index);
306
307 r = in_be32(&p->mr0);
308 if (r & EMAC_MR0_RXE)
309 out_be32(&p->mr0, r & ~EMAC_MR0_RXE);
310 local_irq_restore(flags);
311 }
312
313 static int emac_reset(struct ocp_enet_private *dev)
314 {
315 struct emac_regs __iomem *p = dev->emacp;
316 unsigned long flags;
317 int n = 20;
318
319 DBG("%d: reset" NL, dev->def->index);
320
321 local_irq_save(flags);
322
323 if (!dev->reset_failed) {
324 /* 40x erratum suggests stopping RX channel before reset,
325 * we stop TX as well
326 */
327 emac_rx_disable(dev);
328 emac_tx_disable(dev);
329 }
330
331 out_be32(&p->mr0, EMAC_MR0_SRST);
332 while ((in_be32(&p->mr0) & EMAC_MR0_SRST) && n)
333 --n;
334 local_irq_restore(flags);
335
336 if (n) {
337 dev->reset_failed = 0;
338 return 0;
339 } else {
340 emac_report_timeout_error(dev, "reset timeout");
341 dev->reset_failed = 1;
342 return -ETIMEDOUT;
343 }
344 }
345
346 static void emac_hash_mc(struct ocp_enet_private *dev)
347 {
348 struct emac_regs __iomem *p = dev->emacp;
349 u16 gaht[4] = { 0 };
350 struct dev_mc_list *dmi;
351
352 DBG("%d: hash_mc %d" NL, dev->def->index, dev->ndev->mc_count);
353
354 for (dmi = dev->ndev->mc_list; dmi; dmi = dmi->next) {
355 int bit;
356 DECLARE_MAC_BUF(mac);
357 DBG2("%d: mc %s" NL,
358 dev->def->index, print_mac(mac, dmi->dmi_addr));
359
360 bit = 63 - (ether_crc(ETH_ALEN, dmi->dmi_addr) >> 26);
361 gaht[bit >> 4] |= 0x8000 >> (bit & 0x0f);
362 }
363 out_be32(&p->gaht1, gaht[0]);
364 out_be32(&p->gaht2, gaht[1]);
365 out_be32(&p->gaht3, gaht[2]);
366 out_be32(&p->gaht4, gaht[3]);
367 }
368
369 static inline u32 emac_iff2rmr(struct net_device *ndev)
370 {
371 u32 r = EMAC_RMR_SP | EMAC_RMR_SFCS | EMAC_RMR_IAE | EMAC_RMR_BAE |
372 EMAC_RMR_BASE;
373
374 if (ndev->flags & IFF_PROMISC)
375 r |= EMAC_RMR_PME;
376 else if (ndev->flags & IFF_ALLMULTI || ndev->mc_count > 32)
377 r |= EMAC_RMR_PMME;
378 else if (ndev->mc_count > 0)
379 r |= EMAC_RMR_MAE;
380
381 return r;
382 }
383
384 static inline int emac_opb_mhz(void)
385 {
386 return (ocp_sys_info.opb_bus_freq + 500000) / 1000000;
387 }
388
389 /* BHs disabled */
390 static int emac_configure(struct ocp_enet_private *dev)
391 {
392 struct emac_regs __iomem *p = dev->emacp;
393 struct net_device *ndev = dev->ndev;
394 int gige;
395 u32 r;
396
397 DBG("%d: configure" NL, dev->def->index);
398
399 if (emac_reset(dev) < 0)
400 return -ETIMEDOUT;
401
402 tah_reset(dev->tah_dev);
403
404 /* Mode register */
405 r = EMAC_MR1_BASE(emac_opb_mhz()) | EMAC_MR1_VLE | EMAC_MR1_IST;
406 if (dev->phy.duplex == DUPLEX_FULL)
407 r |= EMAC_MR1_FDE | EMAC_MR1_MWSW_001;
408 dev->stop_timeout = STOP_TIMEOUT_10;
409 switch (dev->phy.speed) {
410 case SPEED_1000:
411 if (emac_phy_gpcs(dev->phy.mode)) {
412 r |= EMAC_MR1_MF_1000GPCS |
413 EMAC_MR1_MF_IPPA(dev->phy.address);
414
415 /* Put some arbitrary OUI, Manuf & Rev IDs so we can
416 * identify this GPCS PHY later.
417 */
418 out_be32(&p->ipcr, 0xdeadbeef);
419 } else
420 r |= EMAC_MR1_MF_1000;
421 r |= EMAC_MR1_RFS_16K;
422 gige = 1;
423
424 if (dev->ndev->mtu > ETH_DATA_LEN) {
425 r |= EMAC_MR1_JPSM;
426 dev->stop_timeout = STOP_TIMEOUT_1000_JUMBO;
427 } else
428 dev->stop_timeout = STOP_TIMEOUT_1000;
429 break;
430 case SPEED_100:
431 r |= EMAC_MR1_MF_100;
432 dev->stop_timeout = STOP_TIMEOUT_100;
433 /* Fall through */
434 default:
435 r |= EMAC_MR1_RFS_4K;
436 gige = 0;
437 break;
438 }
439
440 if (dev->rgmii_dev)
441 rgmii_set_speed(dev->rgmii_dev, dev->rgmii_input,
442 dev->phy.speed);
443 else
444 zmii_set_speed(dev->zmii_dev, dev->zmii_input, dev->phy.speed);
445
446 #if !defined(CONFIG_40x)
447 /* on 40x erratum forces us to NOT use integrated flow control,
448 * let's hope it works on 44x ;)
449 */
450 if (dev->phy.duplex == DUPLEX_FULL) {
451 if (dev->phy.pause)
452 r |= EMAC_MR1_EIFC | EMAC_MR1_APP;
453 else if (dev->phy.asym_pause)
454 r |= EMAC_MR1_APP;
455 }
456 #endif
457 out_be32(&p->mr1, r);
458
459 /* Set individual MAC address */
460 out_be32(&p->iahr, (ndev->dev_addr[0] << 8) | ndev->dev_addr[1]);
461 out_be32(&p->ialr, (ndev->dev_addr[2] << 24) |
462 (ndev->dev_addr[3] << 16) | (ndev->dev_addr[4] << 8) |
463 ndev->dev_addr[5]);
464
465 /* VLAN Tag Protocol ID */
466 out_be32(&p->vtpid, 0x8100);
467
468 /* Receive mode register */
469 r = emac_iff2rmr(ndev);
470 if (r & EMAC_RMR_MAE)
471 emac_hash_mc(dev);
472 out_be32(&p->rmr, r);
473
474 /* FIFOs thresholds */
475 r = EMAC_TMR1((EMAC_MAL_BURST_SIZE / EMAC_FIFO_ENTRY_SIZE) + 1,
476 EMAC_TX_FIFO_SIZE / 2 / EMAC_FIFO_ENTRY_SIZE);
477 out_be32(&p->tmr1, r);
478 out_be32(&p->trtr, EMAC_TRTR(EMAC_TX_FIFO_SIZE / 2));
479
480 /* PAUSE frame is sent when RX FIFO reaches its high-water mark,
481 there should be still enough space in FIFO to allow the our link
482 partner time to process this frame and also time to send PAUSE
483 frame itself.
484
485 Here is the worst case scenario for the RX FIFO "headroom"
486 (from "The Switch Book") (100Mbps, without preamble, inter-frame gap):
487
488 1) One maximum-length frame on TX 1522 bytes
489 2) One PAUSE frame time 64 bytes
490 3) PAUSE frame decode time allowance 64 bytes
491 4) One maximum-length frame on RX 1522 bytes
492 5) Round-trip propagation delay of the link (100Mb) 15 bytes
493 ----------
494 3187 bytes
495
496 I chose to set high-water mark to RX_FIFO_SIZE / 4 (1024 bytes)
497 low-water mark to RX_FIFO_SIZE / 8 (512 bytes)
498 */
499 r = EMAC_RWMR(EMAC_RX_FIFO_SIZE(gige) / 8 / EMAC_FIFO_ENTRY_SIZE,
500 EMAC_RX_FIFO_SIZE(gige) / 4 / EMAC_FIFO_ENTRY_SIZE);
501 out_be32(&p->rwmr, r);
502
503 /* Set PAUSE timer to the maximum */
504 out_be32(&p->ptr, 0xffff);
505
506 /* IRQ sources */
507 out_be32(&p->iser, EMAC_ISR_TXPE | EMAC_ISR_RXPE | /* EMAC_ISR_TXUE |
508 EMAC_ISR_RXOE | */ EMAC_ISR_OVR | EMAC_ISR_BP | EMAC_ISR_SE |
509 EMAC_ISR_ALE | EMAC_ISR_BFCS | EMAC_ISR_PTLE | EMAC_ISR_ORE |
510 EMAC_ISR_IRE | EMAC_ISR_TE);
511
512 /* We need to take GPCS PHY out of isolate mode after EMAC reset */
513 if (emac_phy_gpcs(dev->phy.mode))
514 mii_reset_phy(&dev->phy);
515
516 return 0;
517 }
518
519 /* BHs disabled */
520 static void emac_reinitialize(struct ocp_enet_private *dev)
521 {
522 DBG("%d: reinitialize" NL, dev->def->index);
523
524 if (!emac_configure(dev)) {
525 emac_tx_enable(dev);
526 emac_rx_enable(dev);
527 }
528 }
529
530 /* BHs disabled */
531 static void emac_full_tx_reset(struct net_device *ndev)
532 {
533 struct ocp_enet_private *dev = ndev->priv;
534 struct ocp_func_emac_data *emacdata = dev->def->additions;
535
536 DBG("%d: full_tx_reset" NL, dev->def->index);
537
538 emac_tx_disable(dev);
539 mal_disable_tx_channel(dev->mal, emacdata->mal_tx_chan);
540 emac_clean_tx_ring(dev);
541 dev->tx_cnt = dev->tx_slot = dev->ack_slot = 0;
542
543 emac_configure(dev);
544
545 mal_enable_tx_channel(dev->mal, emacdata->mal_tx_chan);
546 emac_tx_enable(dev);
547 emac_rx_enable(dev);
548
549 netif_wake_queue(ndev);
550 }
551
552 static int __emac_mdio_read(struct ocp_enet_private *dev, u8 id, u8 reg)
553 {
554 struct emac_regs __iomem *p = dev->emacp;
555 u32 r;
556 int n;
557
558 DBG2("%d: mdio_read(%02x,%02x)" NL, dev->def->index, id, reg);
559
560 /* Enable proper MDIO port */
561 zmii_enable_mdio(dev->zmii_dev, dev->zmii_input);
562
563 /* Wait for management interface to become idle */
564 n = 10;
565 while (!emac_phy_done(in_be32(&p->stacr))) {
566 udelay(1);
567 if (!--n)
568 goto to;
569 }
570
571 /* Issue read command */
572 out_be32(&p->stacr,
573 EMAC_STACR_BASE(emac_opb_mhz()) | EMAC_STACR_STAC_READ |
574 (reg & EMAC_STACR_PRA_MASK)
575 | ((id & EMAC_STACR_PCDA_MASK) << EMAC_STACR_PCDA_SHIFT)
576 | EMAC_STACR_START);
577
578 /* Wait for read to complete */
579 n = 100;
580 while (!emac_phy_done(r = in_be32(&p->stacr))) {
581 udelay(1);
582 if (!--n)
583 goto to;
584 }
585
586 if (unlikely(r & EMAC_STACR_PHYE)) {
587 DBG("%d: mdio_read(%02x, %02x) failed" NL, dev->def->index,
588 id, reg);
589 return -EREMOTEIO;
590 }
591
592 r = ((r >> EMAC_STACR_PHYD_SHIFT) & EMAC_STACR_PHYD_MASK);
593 DBG2("%d: mdio_read -> %04x" NL, dev->def->index, r);
594 return r;
595 to:
596 DBG("%d: MII management interface timeout (read)" NL, dev->def->index);
597 return -ETIMEDOUT;
598 }
599
600 static void __emac_mdio_write(struct ocp_enet_private *dev, u8 id, u8 reg,
601 u16 val)
602 {
603 struct emac_regs __iomem *p = dev->emacp;
604 int n;
605
606 DBG2("%d: mdio_write(%02x,%02x,%04x)" NL, dev->def->index, id, reg,
607 val);
608
609 /* Enable proper MDIO port */
610 zmii_enable_mdio(dev->zmii_dev, dev->zmii_input);
611
612 /* Wait for management interface to be idle */
613 n = 10;
614 while (!emac_phy_done(in_be32(&p->stacr))) {
615 udelay(1);
616 if (!--n)
617 goto to;
618 }
619
620 /* Issue write command */
621 out_be32(&p->stacr,
622 EMAC_STACR_BASE(emac_opb_mhz()) | EMAC_STACR_STAC_WRITE |
623 (reg & EMAC_STACR_PRA_MASK) |
624 ((id & EMAC_STACR_PCDA_MASK) << EMAC_STACR_PCDA_SHIFT) |
625 (val << EMAC_STACR_PHYD_SHIFT) | EMAC_STACR_START);
626
627 /* Wait for write to complete */
628 n = 100;
629 while (!emac_phy_done(in_be32(&p->stacr))) {
630 udelay(1);
631 if (!--n)
632 goto to;
633 }
634 return;
635 to:
636 DBG("%d: MII management interface timeout (write)" NL, dev->def->index);
637 }
638
639 static int emac_mdio_read(struct net_device *ndev, int id, int reg)
640 {
641 struct ocp_enet_private *dev = ndev->priv;
642 int res;
643
644 local_bh_disable();
645 res = __emac_mdio_read(dev->mdio_dev ? dev->mdio_dev : dev, (u8) id,
646 (u8) reg);
647 local_bh_enable();
648 return res;
649 }
650
651 static void emac_mdio_write(struct net_device *ndev, int id, int reg, int val)
652 {
653 struct ocp_enet_private *dev = ndev->priv;
654
655 local_bh_disable();
656 __emac_mdio_write(dev->mdio_dev ? dev->mdio_dev : dev, (u8) id,
657 (u8) reg, (u16) val);
658 local_bh_enable();
659 }
660
661 /* BHs disabled */
662 static void emac_set_multicast_list(struct net_device *ndev)
663 {
664 struct ocp_enet_private *dev = ndev->priv;
665 struct emac_regs __iomem *p = dev->emacp;
666 u32 rmr = emac_iff2rmr(ndev);
667
668 DBG("%d: multicast %08x" NL, dev->def->index, rmr);
669 BUG_ON(!netif_running(dev->ndev));
670
671 /* I decided to relax register access rules here to avoid
672 * full EMAC reset.
673 *
674 * There is a real problem with EMAC4 core if we use MWSW_001 bit
675 * in MR1 register and do a full EMAC reset.
676 * One TX BD status update is delayed and, after EMAC reset, it
677 * never happens, resulting in TX hung (it'll be recovered by TX
678 * timeout handler eventually, but this is just gross).
679 * So we either have to do full TX reset or try to cheat here :)
680 *
681 * The only required change is to RX mode register, so I *think* all
682 * we need is just to stop RX channel. This seems to work on all
683 * tested SoCs. --ebs
684 */
685 emac_rx_disable(dev);
686 if (rmr & EMAC_RMR_MAE)
687 emac_hash_mc(dev);
688 out_be32(&p->rmr, rmr);
689 emac_rx_enable(dev);
690 }
691
692 /* BHs disabled */
693 static int emac_resize_rx_ring(struct ocp_enet_private *dev, int new_mtu)
694 {
695 struct ocp_func_emac_data *emacdata = dev->def->additions;
696 int rx_sync_size = emac_rx_sync_size(new_mtu);
697 int rx_skb_size = emac_rx_skb_size(new_mtu);
698 int i, ret = 0;
699
700 emac_rx_disable(dev);
701 mal_disable_rx_channel(dev->mal, emacdata->mal_rx_chan);
702
703 if (dev->rx_sg_skb) {
704 ++dev->estats.rx_dropped_resize;
705 dev_kfree_skb(dev->rx_sg_skb);
706 dev->rx_sg_skb = NULL;
707 }
708
709 /* Make a first pass over RX ring and mark BDs ready, dropping
710 * non-processed packets on the way. We need this as a separate pass
711 * to simplify error recovery in the case of allocation failure later.
712 */
713 for (i = 0; i < NUM_RX_BUFF; ++i) {
714 if (dev->rx_desc[i].ctrl & MAL_RX_CTRL_FIRST)
715 ++dev->estats.rx_dropped_resize;
716
717 dev->rx_desc[i].data_len = 0;
718 dev->rx_desc[i].ctrl = MAL_RX_CTRL_EMPTY |
719 (i == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
720 }
721
722 /* Reallocate RX ring only if bigger skb buffers are required */
723 if (rx_skb_size <= dev->rx_skb_size)
724 goto skip;
725
726 /* Second pass, allocate new skbs */
727 for (i = 0; i < NUM_RX_BUFF; ++i) {
728 struct sk_buff *skb = alloc_skb(rx_skb_size, GFP_ATOMIC);
729 if (!skb) {
730 ret = -ENOMEM;
731 goto oom;
732 }
733
734 BUG_ON(!dev->rx_skb[i]);
735 dev_kfree_skb(dev->rx_skb[i]);
736
737 skb_reserve(skb, EMAC_RX_SKB_HEADROOM + 2);
738 dev->rx_desc[i].data_ptr =
739 dma_map_single(dev->ldev, skb->data - 2, rx_sync_size,
740 DMA_FROM_DEVICE) + 2;
741 dev->rx_skb[i] = skb;
742 }
743 skip:
744 /* Check if we need to change "Jumbo" bit in MR1 */
745 if ((new_mtu > ETH_DATA_LEN) ^ (dev->ndev->mtu > ETH_DATA_LEN)) {
746 /* This is to prevent starting RX channel in emac_rx_enable() */
747 dev->commac.rx_stopped = 1;
748
749 dev->ndev->mtu = new_mtu;
750 emac_full_tx_reset(dev->ndev);
751 }
752
753 mal_set_rcbs(dev->mal, emacdata->mal_rx_chan, emac_rx_size(new_mtu));
754 oom:
755 /* Restart RX */
756 dev->commac.rx_stopped = dev->rx_slot = 0;
757 mal_enable_rx_channel(dev->mal, emacdata->mal_rx_chan);
758 emac_rx_enable(dev);
759
760 return ret;
761 }
762
763 /* Process ctx, rtnl_lock semaphore */
764 static int emac_change_mtu(struct net_device *ndev, int new_mtu)
765 {
766 struct ocp_enet_private *dev = ndev->priv;
767 int ret = 0;
768
769 if (new_mtu < EMAC_MIN_MTU || new_mtu > EMAC_MAX_MTU)
770 return -EINVAL;
771
772 DBG("%d: change_mtu(%d)" NL, dev->def->index, new_mtu);
773
774 local_bh_disable();
775 if (netif_running(ndev)) {
776 /* Check if we really need to reinitalize RX ring */
777 if (emac_rx_skb_size(ndev->mtu) != emac_rx_skb_size(new_mtu))
778 ret = emac_resize_rx_ring(dev, new_mtu);
779 }
780
781 if (!ret) {
782 ndev->mtu = new_mtu;
783 dev->rx_skb_size = emac_rx_skb_size(new_mtu);
784 dev->rx_sync_size = emac_rx_sync_size(new_mtu);
785 }
786 local_bh_enable();
787
788 return ret;
789 }
790
791 static void emac_clean_tx_ring(struct ocp_enet_private *dev)
792 {
793 int i;
794 for (i = 0; i < NUM_TX_BUFF; ++i) {
795 if (dev->tx_skb[i]) {
796 dev_kfree_skb(dev->tx_skb[i]);
797 dev->tx_skb[i] = NULL;
798 if (dev->tx_desc[i].ctrl & MAL_TX_CTRL_READY)
799 ++dev->estats.tx_dropped;
800 }
801 dev->tx_desc[i].ctrl = 0;
802 dev->tx_desc[i].data_ptr = 0;
803 }
804 }
805
806 static void emac_clean_rx_ring(struct ocp_enet_private *dev)
807 {
808 int i;
809 for (i = 0; i < NUM_RX_BUFF; ++i)
810 if (dev->rx_skb[i]) {
811 dev->rx_desc[i].ctrl = 0;
812 dev_kfree_skb(dev->rx_skb[i]);
813 dev->rx_skb[i] = NULL;
814 dev->rx_desc[i].data_ptr = 0;
815 }
816
817 if (dev->rx_sg_skb) {
818 dev_kfree_skb(dev->rx_sg_skb);
819 dev->rx_sg_skb = NULL;
820 }
821 }
822
823 static inline int emac_alloc_rx_skb(struct ocp_enet_private *dev, int slot,
824 gfp_t flags)
825 {
826 struct sk_buff *skb = alloc_skb(dev->rx_skb_size, flags);
827 if (unlikely(!skb))
828 return -ENOMEM;
829
830 dev->rx_skb[slot] = skb;
831 dev->rx_desc[slot].data_len = 0;
832
833 skb_reserve(skb, EMAC_RX_SKB_HEADROOM + 2);
834 dev->rx_desc[slot].data_ptr =
835 dma_map_single(dev->ldev, skb->data - 2, dev->rx_sync_size,
836 DMA_FROM_DEVICE) + 2;
837 barrier();
838 dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
839 (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
840
841 return 0;
842 }
843
844 static void emac_print_link_status(struct ocp_enet_private *dev)
845 {
846 if (netif_carrier_ok(dev->ndev))
847 printk(KERN_INFO "%s: link is up, %d %s%s\n",
848 dev->ndev->name, dev->phy.speed,
849 dev->phy.duplex == DUPLEX_FULL ? "FDX" : "HDX",
850 dev->phy.pause ? ", pause enabled" :
851 dev->phy.asym_pause ? ", assymetric pause enabled" : "");
852 else
853 printk(KERN_INFO "%s: link is down\n", dev->ndev->name);
854 }
855
856 /* Process ctx, rtnl_lock semaphore */
857 static int emac_open(struct net_device *ndev)
858 {
859 struct ocp_enet_private *dev = ndev->priv;
860 struct ocp_func_emac_data *emacdata = dev->def->additions;
861 int err, i;
862
863 DBG("%d: open" NL, dev->def->index);
864
865 /* Setup error IRQ handler */
866 err = request_irq(dev->def->irq, emac_irq, 0, "EMAC", dev);
867 if (err) {
868 printk(KERN_ERR "%s: failed to request IRQ %d\n",
869 ndev->name, dev->def->irq);
870 return err;
871 }
872
873 /* Allocate RX ring */
874 for (i = 0; i < NUM_RX_BUFF; ++i)
875 if (emac_alloc_rx_skb(dev, i, GFP_KERNEL)) {
876 printk(KERN_ERR "%s: failed to allocate RX ring\n",
877 ndev->name);
878 goto oom;
879 }
880
881 local_bh_disable();
882 dev->tx_cnt = dev->tx_slot = dev->ack_slot = dev->rx_slot =
883 dev->commac.rx_stopped = 0;
884 dev->rx_sg_skb = NULL;
885
886 if (dev->phy.address >= 0) {
887 int link_poll_interval;
888 if (dev->phy.def->ops->poll_link(&dev->phy)) {
889 dev->phy.def->ops->read_link(&dev->phy);
890 EMAC_RX_CLK_DEFAULT(dev->def->index);
891 netif_carrier_on(dev->ndev);
892 link_poll_interval = PHY_POLL_LINK_ON;
893 } else {
894 EMAC_RX_CLK_TX(dev->def->index);
895 netif_carrier_off(dev->ndev);
896 link_poll_interval = PHY_POLL_LINK_OFF;
897 }
898 mod_timer(&dev->link_timer, jiffies + link_poll_interval);
899 emac_print_link_status(dev);
900 } else
901 netif_carrier_on(dev->ndev);
902
903 emac_configure(dev);
904 mal_poll_add(dev->mal, &dev->commac);
905 mal_enable_tx_channel(dev->mal, emacdata->mal_tx_chan);
906 mal_set_rcbs(dev->mal, emacdata->mal_rx_chan, emac_rx_size(ndev->mtu));
907 mal_enable_rx_channel(dev->mal, emacdata->mal_rx_chan);
908 emac_tx_enable(dev);
909 emac_rx_enable(dev);
910 netif_start_queue(ndev);
911 local_bh_enable();
912
913 return 0;
914 oom:
915 emac_clean_rx_ring(dev);
916 free_irq(dev->def->irq, dev);
917 return -ENOMEM;
918 }
919
920 /* BHs disabled */
921 static int emac_link_differs(struct ocp_enet_private *dev)
922 {
923 u32 r = in_be32(&dev->emacp->mr1);
924
925 int duplex = r & EMAC_MR1_FDE ? DUPLEX_FULL : DUPLEX_HALF;
926 int speed, pause, asym_pause;
927
928 if (r & EMAC_MR1_MF_1000)
929 speed = SPEED_1000;
930 else if (r & EMAC_MR1_MF_100)
931 speed = SPEED_100;
932 else
933 speed = SPEED_10;
934
935 switch (r & (EMAC_MR1_EIFC | EMAC_MR1_APP)) {
936 case (EMAC_MR1_EIFC | EMAC_MR1_APP):
937 pause = 1;
938 asym_pause = 0;
939 break;
940 case EMAC_MR1_APP:
941 pause = 0;
942 asym_pause = 1;
943 break;
944 default:
945 pause = asym_pause = 0;
946 }
947 return speed != dev->phy.speed || duplex != dev->phy.duplex ||
948 pause != dev->phy.pause || asym_pause != dev->phy.asym_pause;
949 }
950
951 /* BHs disabled */
952 static void emac_link_timer(unsigned long data)
953 {
954 struct ocp_enet_private *dev = (struct ocp_enet_private *)data;
955 int link_poll_interval;
956
957 DBG2("%d: link timer" NL, dev->def->index);
958
959 if (dev->phy.def->ops->poll_link(&dev->phy)) {
960 if (!netif_carrier_ok(dev->ndev)) {
961 EMAC_RX_CLK_DEFAULT(dev->def->index);
962
963 /* Get new link parameters */
964 dev->phy.def->ops->read_link(&dev->phy);
965
966 if (dev->tah_dev || emac_link_differs(dev))
967 emac_full_tx_reset(dev->ndev);
968
969 netif_carrier_on(dev->ndev);
970 emac_print_link_status(dev);
971 }
972 link_poll_interval = PHY_POLL_LINK_ON;
973 } else {
974 if (netif_carrier_ok(dev->ndev)) {
975 EMAC_RX_CLK_TX(dev->def->index);
976 #if defined(CONFIG_IBM_EMAC_PHY_RX_CLK_FIX)
977 emac_reinitialize(dev);
978 #endif
979 netif_carrier_off(dev->ndev);
980 emac_print_link_status(dev);
981 }
982
983 /* Retry reset if the previous attempt failed.
984 * This is needed mostly for CONFIG_IBM_EMAC_PHY_RX_CLK_FIX
985 * case, but I left it here because it shouldn't trigger for
986 * sane PHYs anyway.
987 */
988 if (unlikely(dev->reset_failed))
989 emac_reinitialize(dev);
990
991 link_poll_interval = PHY_POLL_LINK_OFF;
992 }
993 mod_timer(&dev->link_timer, jiffies + link_poll_interval);
994 }
995
996 /* BHs disabled */
997 static void emac_force_link_update(struct ocp_enet_private *dev)
998 {
999 netif_carrier_off(dev->ndev);
1000 if (timer_pending(&dev->link_timer))
1001 mod_timer(&dev->link_timer, jiffies + PHY_POLL_LINK_OFF);
1002 }
1003
1004 /* Process ctx, rtnl_lock semaphore */
1005 static int emac_close(struct net_device *ndev)
1006 {
1007 struct ocp_enet_private *dev = ndev->priv;
1008 struct ocp_func_emac_data *emacdata = dev->def->additions;
1009
1010 DBG("%d: close" NL, dev->def->index);
1011
1012 local_bh_disable();
1013
1014 if (dev->phy.address >= 0)
1015 del_timer_sync(&dev->link_timer);
1016
1017 netif_stop_queue(ndev);
1018 emac_rx_disable(dev);
1019 emac_tx_disable(dev);
1020 mal_disable_rx_channel(dev->mal, emacdata->mal_rx_chan);
1021 mal_disable_tx_channel(dev->mal, emacdata->mal_tx_chan);
1022 mal_poll_del(dev->mal, &dev->commac);
1023 local_bh_enable();
1024
1025 emac_clean_tx_ring(dev);
1026 emac_clean_rx_ring(dev);
1027 free_irq(dev->def->irq, dev);
1028
1029 return 0;
1030 }
1031
1032 static inline u16 emac_tx_csum(struct ocp_enet_private *dev,
1033 struct sk_buff *skb)
1034 {
1035 #if defined(CONFIG_IBM_EMAC_TAH)
1036 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1037 ++dev->stats.tx_packets_csum;
1038 return EMAC_TX_CTRL_TAH_CSUM;
1039 }
1040 #endif
1041 return 0;
1042 }
1043
1044 static inline int emac_xmit_finish(struct ocp_enet_private *dev, int len)
1045 {
1046 struct emac_regs __iomem *p = dev->emacp;
1047 struct net_device *ndev = dev->ndev;
1048
1049 /* Send the packet out */
1050 out_be32(&p->tmr0, EMAC_TMR0_XMIT);
1051
1052 if (unlikely(++dev->tx_cnt == NUM_TX_BUFF)) {
1053 netif_stop_queue(ndev);
1054 DBG2("%d: stopped TX queue" NL, dev->def->index);
1055 }
1056
1057 ndev->trans_start = jiffies;
1058 ++dev->stats.tx_packets;
1059 dev->stats.tx_bytes += len;
1060
1061 return 0;
1062 }
1063
1064 /* BHs disabled */
1065 static int emac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1066 {
1067 struct ocp_enet_private *dev = ndev->priv;
1068 unsigned int len = skb->len;
1069 int slot;
1070
1071 u16 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1072 MAL_TX_CTRL_LAST | emac_tx_csum(dev, skb);
1073
1074 slot = dev->tx_slot++;
1075 if (dev->tx_slot == NUM_TX_BUFF) {
1076 dev->tx_slot = 0;
1077 ctrl |= MAL_TX_CTRL_WRAP;
1078 }
1079
1080 DBG2("%d: xmit(%u) %d" NL, dev->def->index, len, slot);
1081
1082 dev->tx_skb[slot] = skb;
1083 dev->tx_desc[slot].data_ptr = dma_map_single(dev->ldev, skb->data, len,
1084 DMA_TO_DEVICE);
1085 dev->tx_desc[slot].data_len = (u16) len;
1086 barrier();
1087 dev->tx_desc[slot].ctrl = ctrl;
1088
1089 return emac_xmit_finish(dev, len);
1090 }
1091
1092 #if defined(CONFIG_IBM_EMAC_TAH)
1093 static inline int emac_xmit_split(struct ocp_enet_private *dev, int slot,
1094 u32 pd, int len, int last, u16 base_ctrl)
1095 {
1096 while (1) {
1097 u16 ctrl = base_ctrl;
1098 int chunk = min(len, MAL_MAX_TX_SIZE);
1099 len -= chunk;
1100
1101 slot = (slot + 1) % NUM_TX_BUFF;
1102
1103 if (last && !len)
1104 ctrl |= MAL_TX_CTRL_LAST;
1105 if (slot == NUM_TX_BUFF - 1)
1106 ctrl |= MAL_TX_CTRL_WRAP;
1107
1108 dev->tx_skb[slot] = NULL;
1109 dev->tx_desc[slot].data_ptr = pd;
1110 dev->tx_desc[slot].data_len = (u16) chunk;
1111 dev->tx_desc[slot].ctrl = ctrl;
1112 ++dev->tx_cnt;
1113
1114 if (!len)
1115 break;
1116
1117 pd += chunk;
1118 }
1119 return slot;
1120 }
1121
1122 /* BHs disabled (SG version for TAH equipped EMACs) */
1123 static int emac_start_xmit_sg(struct sk_buff *skb, struct net_device *ndev)
1124 {
1125 struct ocp_enet_private *dev = ndev->priv;
1126 int nr_frags = skb_shinfo(skb)->nr_frags;
1127 int len = skb->len, chunk;
1128 int slot, i;
1129 u16 ctrl;
1130 u32 pd;
1131
1132 /* This is common "fast" path */
1133 if (likely(!nr_frags && len <= MAL_MAX_TX_SIZE))
1134 return emac_start_xmit(skb, ndev);
1135
1136 len -= skb->data_len;
1137
1138 /* Note, this is only an *estimation*, we can still run out of empty
1139 * slots because of the additional fragmentation into
1140 * MAL_MAX_TX_SIZE-sized chunks
1141 */
1142 if (unlikely(dev->tx_cnt + nr_frags + mal_tx_chunks(len) > NUM_TX_BUFF))
1143 goto stop_queue;
1144
1145 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1146 emac_tx_csum(dev, skb);
1147 slot = dev->tx_slot;
1148
1149 /* skb data */
1150 dev->tx_skb[slot] = NULL;
1151 chunk = min(len, MAL_MAX_TX_SIZE);
1152 dev->tx_desc[slot].data_ptr = pd =
1153 dma_map_single(dev->ldev, skb->data, len, DMA_TO_DEVICE);
1154 dev->tx_desc[slot].data_len = (u16) chunk;
1155 len -= chunk;
1156 if (unlikely(len))
1157 slot = emac_xmit_split(dev, slot, pd + chunk, len, !nr_frags,
1158 ctrl);
1159 /* skb fragments */
1160 for (i = 0; i < nr_frags; ++i) {
1161 struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
1162 len = frag->size;
1163
1164 if (unlikely(dev->tx_cnt + mal_tx_chunks(len) >= NUM_TX_BUFF))
1165 goto undo_frame;
1166
1167 pd = dma_map_page(dev->ldev, frag->page, frag->page_offset, len,
1168 DMA_TO_DEVICE);
1169
1170 slot = emac_xmit_split(dev, slot, pd, len, i == nr_frags - 1,
1171 ctrl);
1172 }
1173
1174 DBG2("%d: xmit_sg(%u) %d - %d" NL, dev->def->index, skb->len,
1175 dev->tx_slot, slot);
1176
1177 /* Attach skb to the last slot so we don't release it too early */
1178 dev->tx_skb[slot] = skb;
1179
1180 /* Send the packet out */
1181 if (dev->tx_slot == NUM_TX_BUFF - 1)
1182 ctrl |= MAL_TX_CTRL_WRAP;
1183 barrier();
1184 dev->tx_desc[dev->tx_slot].ctrl = ctrl;
1185 dev->tx_slot = (slot + 1) % NUM_TX_BUFF;
1186
1187 return emac_xmit_finish(dev, skb->len);
1188
1189 undo_frame:
1190 /* Well, too bad. Our previous estimation was overly optimistic.
1191 * Undo everything.
1192 */
1193 while (slot != dev->tx_slot) {
1194 dev->tx_desc[slot].ctrl = 0;
1195 --dev->tx_cnt;
1196 if (--slot < 0)
1197 slot = NUM_TX_BUFF - 1;
1198 }
1199 ++dev->estats.tx_undo;
1200
1201 stop_queue:
1202 netif_stop_queue(ndev);
1203 DBG2("%d: stopped TX queue" NL, dev->def->index);
1204 return 1;
1205 }
1206 #else
1207 # define emac_start_xmit_sg emac_start_xmit
1208 #endif /* !defined(CONFIG_IBM_EMAC_TAH) */
1209
1210 /* BHs disabled */
1211 static void emac_parse_tx_error(struct ocp_enet_private *dev, u16 ctrl)
1212 {
1213 struct ibm_emac_error_stats *st = &dev->estats;
1214 DBG("%d: BD TX error %04x" NL, dev->def->index, ctrl);
1215
1216 ++st->tx_bd_errors;
1217 if (ctrl & EMAC_TX_ST_BFCS)
1218 ++st->tx_bd_bad_fcs;
1219 if (ctrl & EMAC_TX_ST_LCS)
1220 ++st->tx_bd_carrier_loss;
1221 if (ctrl & EMAC_TX_ST_ED)
1222 ++st->tx_bd_excessive_deferral;
1223 if (ctrl & EMAC_TX_ST_EC)
1224 ++st->tx_bd_excessive_collisions;
1225 if (ctrl & EMAC_TX_ST_LC)
1226 ++st->tx_bd_late_collision;
1227 if (ctrl & EMAC_TX_ST_MC)
1228 ++st->tx_bd_multple_collisions;
1229 if (ctrl & EMAC_TX_ST_SC)
1230 ++st->tx_bd_single_collision;
1231 if (ctrl & EMAC_TX_ST_UR)
1232 ++st->tx_bd_underrun;
1233 if (ctrl & EMAC_TX_ST_SQE)
1234 ++st->tx_bd_sqe;
1235 }
1236
1237 static void emac_poll_tx(void *param)
1238 {
1239 struct ocp_enet_private *dev = param;
1240 DBG2("%d: poll_tx, %d %d" NL, dev->def->index, dev->tx_cnt,
1241 dev->ack_slot);
1242
1243 if (dev->tx_cnt) {
1244 u16 ctrl;
1245 int slot = dev->ack_slot, n = 0;
1246 again:
1247 ctrl = dev->tx_desc[slot].ctrl;
1248 if (!(ctrl & MAL_TX_CTRL_READY)) {
1249 struct sk_buff *skb = dev->tx_skb[slot];
1250 ++n;
1251
1252 if (skb) {
1253 dev_kfree_skb(skb);
1254 dev->tx_skb[slot] = NULL;
1255 }
1256 slot = (slot + 1) % NUM_TX_BUFF;
1257
1258 if (unlikely(EMAC_IS_BAD_TX(ctrl)))
1259 emac_parse_tx_error(dev, ctrl);
1260
1261 if (--dev->tx_cnt)
1262 goto again;
1263 }
1264 if (n) {
1265 dev->ack_slot = slot;
1266 if (netif_queue_stopped(dev->ndev) &&
1267 dev->tx_cnt < EMAC_TX_WAKEUP_THRESH)
1268 netif_wake_queue(dev->ndev);
1269
1270 DBG2("%d: tx %d pkts" NL, dev->def->index, n);
1271 }
1272 }
1273 }
1274
1275 static inline void emac_recycle_rx_skb(struct ocp_enet_private *dev, int slot,
1276 int len)
1277 {
1278 struct sk_buff *skb = dev->rx_skb[slot];
1279 DBG2("%d: recycle %d %d" NL, dev->def->index, slot, len);
1280
1281 if (len)
1282 dma_map_single(dev->ldev, skb->data - 2,
1283 EMAC_DMA_ALIGN(len + 2), DMA_FROM_DEVICE);
1284
1285 dev->rx_desc[slot].data_len = 0;
1286 barrier();
1287 dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
1288 (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1289 }
1290
1291 static void emac_parse_rx_error(struct ocp_enet_private *dev, u16 ctrl)
1292 {
1293 struct ibm_emac_error_stats *st = &dev->estats;
1294 DBG("%d: BD RX error %04x" NL, dev->def->index, ctrl);
1295
1296 ++st->rx_bd_errors;
1297 if (ctrl & EMAC_RX_ST_OE)
1298 ++st->rx_bd_overrun;
1299 if (ctrl & EMAC_RX_ST_BP)
1300 ++st->rx_bd_bad_packet;
1301 if (ctrl & EMAC_RX_ST_RP)
1302 ++st->rx_bd_runt_packet;
1303 if (ctrl & EMAC_RX_ST_SE)
1304 ++st->rx_bd_short_event;
1305 if (ctrl & EMAC_RX_ST_AE)
1306 ++st->rx_bd_alignment_error;
1307 if (ctrl & EMAC_RX_ST_BFCS)
1308 ++st->rx_bd_bad_fcs;
1309 if (ctrl & EMAC_RX_ST_PTL)
1310 ++st->rx_bd_packet_too_long;
1311 if (ctrl & EMAC_RX_ST_ORE)
1312 ++st->rx_bd_out_of_range;
1313 if (ctrl & EMAC_RX_ST_IRE)
1314 ++st->rx_bd_in_range;
1315 }
1316
1317 static inline void emac_rx_csum(struct ocp_enet_private *dev,
1318 struct sk_buff *skb, u16 ctrl)
1319 {
1320 #if defined(CONFIG_IBM_EMAC_TAH)
1321 if (!ctrl && dev->tah_dev) {
1322 skb->ip_summed = CHECKSUM_UNNECESSARY;
1323 ++dev->stats.rx_packets_csum;
1324 }
1325 #endif
1326 }
1327
1328 static inline int emac_rx_sg_append(struct ocp_enet_private *dev, int slot)
1329 {
1330 if (likely(dev->rx_sg_skb != NULL)) {
1331 int len = dev->rx_desc[slot].data_len;
1332 int tot_len = dev->rx_sg_skb->len + len;
1333
1334 if (unlikely(tot_len + 2 > dev->rx_skb_size)) {
1335 ++dev->estats.rx_dropped_mtu;
1336 dev_kfree_skb(dev->rx_sg_skb);
1337 dev->rx_sg_skb = NULL;
1338 } else {
1339 cacheable_memcpy(skb_tail_pointer(dev->rx_sg_skb),
1340 dev->rx_skb[slot]->data, len);
1341 skb_put(dev->rx_sg_skb, len);
1342 emac_recycle_rx_skb(dev, slot, len);
1343 return 0;
1344 }
1345 }
1346 emac_recycle_rx_skb(dev, slot, 0);
1347 return -1;
1348 }
1349
1350 /* BHs disabled */
1351 static int emac_poll_rx(void *param, int budget)
1352 {
1353 struct ocp_enet_private *dev = param;
1354 int slot = dev->rx_slot, received = 0;
1355
1356 DBG2("%d: poll_rx(%d)" NL, dev->def->index, budget);
1357
1358 again:
1359 while (budget > 0) {
1360 int len;
1361 struct sk_buff *skb;
1362 u16 ctrl = dev->rx_desc[slot].ctrl;
1363
1364 if (ctrl & MAL_RX_CTRL_EMPTY)
1365 break;
1366
1367 skb = dev->rx_skb[slot];
1368 barrier();
1369 len = dev->rx_desc[slot].data_len;
1370
1371 if (unlikely(!MAL_IS_SINGLE_RX(ctrl)))
1372 goto sg;
1373
1374 ctrl &= EMAC_BAD_RX_MASK;
1375 if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1376 emac_parse_rx_error(dev, ctrl);
1377 ++dev->estats.rx_dropped_error;
1378 emac_recycle_rx_skb(dev, slot, 0);
1379 len = 0;
1380 goto next;
1381 }
1382
1383 if (len && len < EMAC_RX_COPY_THRESH) {
1384 struct sk_buff *copy_skb =
1385 alloc_skb(len + EMAC_RX_SKB_HEADROOM + 2, GFP_ATOMIC);
1386 if (unlikely(!copy_skb))
1387 goto oom;
1388
1389 skb_reserve(copy_skb, EMAC_RX_SKB_HEADROOM + 2);
1390 cacheable_memcpy(copy_skb->data - 2, skb->data - 2,
1391 len + 2);
1392 emac_recycle_rx_skb(dev, slot, len);
1393 skb = copy_skb;
1394 } else if (unlikely(emac_alloc_rx_skb(dev, slot, GFP_ATOMIC)))
1395 goto oom;
1396
1397 skb_put(skb, len);
1398 push_packet:
1399 skb->protocol = eth_type_trans(skb, dev->ndev);
1400 emac_rx_csum(dev, skb, ctrl);
1401
1402 if (unlikely(netif_receive_skb(skb) == NET_RX_DROP))
1403 ++dev->estats.rx_dropped_stack;
1404 next:
1405 ++dev->stats.rx_packets;
1406 skip:
1407 dev->stats.rx_bytes += len;
1408 slot = (slot + 1) % NUM_RX_BUFF;
1409 --budget;
1410 ++received;
1411 continue;
1412 sg:
1413 if (ctrl & MAL_RX_CTRL_FIRST) {
1414 BUG_ON(dev->rx_sg_skb);
1415 if (unlikely(emac_alloc_rx_skb(dev, slot, GFP_ATOMIC))) {
1416 DBG("%d: rx OOM %d" NL, dev->def->index, slot);
1417 ++dev->estats.rx_dropped_oom;
1418 emac_recycle_rx_skb(dev, slot, 0);
1419 } else {
1420 dev->rx_sg_skb = skb;
1421 skb_put(skb, len);
1422 }
1423 } else if (!emac_rx_sg_append(dev, slot) &&
1424 (ctrl & MAL_RX_CTRL_LAST)) {
1425
1426 skb = dev->rx_sg_skb;
1427 dev->rx_sg_skb = NULL;
1428
1429 ctrl &= EMAC_BAD_RX_MASK;
1430 if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1431 emac_parse_rx_error(dev, ctrl);
1432 ++dev->estats.rx_dropped_error;
1433 dev_kfree_skb(skb);
1434 len = 0;
1435 } else
1436 goto push_packet;
1437 }
1438 goto skip;
1439 oom:
1440 DBG("%d: rx OOM %d" NL, dev->def->index, slot);
1441 /* Drop the packet and recycle skb */
1442 ++dev->estats.rx_dropped_oom;
1443 emac_recycle_rx_skb(dev, slot, 0);
1444 goto next;
1445 }
1446
1447 if (received) {
1448 DBG2("%d: rx %d BDs" NL, dev->def->index, received);
1449 dev->rx_slot = slot;
1450 }
1451
1452 if (unlikely(budget && dev->commac.rx_stopped)) {
1453 struct ocp_func_emac_data *emacdata = dev->def->additions;
1454
1455 barrier();
1456 if (!(dev->rx_desc[slot].ctrl & MAL_RX_CTRL_EMPTY)) {
1457 DBG2("%d: rx restart" NL, dev->def->index);
1458 received = 0;
1459 goto again;
1460 }
1461
1462 if (dev->rx_sg_skb) {
1463 DBG2("%d: dropping partial rx packet" NL,
1464 dev->def->index);
1465 ++dev->estats.rx_dropped_error;
1466 dev_kfree_skb(dev->rx_sg_skb);
1467 dev->rx_sg_skb = NULL;
1468 }
1469
1470 dev->commac.rx_stopped = 0;
1471 mal_enable_rx_channel(dev->mal, emacdata->mal_rx_chan);
1472 emac_rx_enable(dev);
1473 dev->rx_slot = 0;
1474 }
1475 return received;
1476 }
1477
1478 /* BHs disabled */
1479 static int emac_peek_rx(void *param)
1480 {
1481 struct ocp_enet_private *dev = param;
1482 return !(dev->rx_desc[dev->rx_slot].ctrl & MAL_RX_CTRL_EMPTY);
1483 }
1484
1485 /* BHs disabled */
1486 static int emac_peek_rx_sg(void *param)
1487 {
1488 struct ocp_enet_private *dev = param;
1489 int slot = dev->rx_slot;
1490 while (1) {
1491 u16 ctrl = dev->rx_desc[slot].ctrl;
1492 if (ctrl & MAL_RX_CTRL_EMPTY)
1493 return 0;
1494 else if (ctrl & MAL_RX_CTRL_LAST)
1495 return 1;
1496
1497 slot = (slot + 1) % NUM_RX_BUFF;
1498
1499 /* I'm just being paranoid here :) */
1500 if (unlikely(slot == dev->rx_slot))
1501 return 0;
1502 }
1503 }
1504
1505 /* Hard IRQ */
1506 static void emac_rxde(void *param)
1507 {
1508 struct ocp_enet_private *dev = param;
1509 ++dev->estats.rx_stopped;
1510 emac_rx_disable_async(dev);
1511 }
1512
1513 /* Hard IRQ */
1514 static irqreturn_t emac_irq(int irq, void *dev_instance)
1515 {
1516 struct ocp_enet_private *dev = dev_instance;
1517 struct emac_regs __iomem *p = dev->emacp;
1518 struct ibm_emac_error_stats *st = &dev->estats;
1519
1520 u32 isr = in_be32(&p->isr);
1521 out_be32(&p->isr, isr);
1522
1523 DBG("%d: isr = %08x" NL, dev->def->index, isr);
1524
1525 if (isr & EMAC_ISR_TXPE)
1526 ++st->tx_parity;
1527 if (isr & EMAC_ISR_RXPE)
1528 ++st->rx_parity;
1529 if (isr & EMAC_ISR_TXUE)
1530 ++st->tx_underrun;
1531 if (isr & EMAC_ISR_RXOE)
1532 ++st->rx_fifo_overrun;
1533 if (isr & EMAC_ISR_OVR)
1534 ++st->rx_overrun;
1535 if (isr & EMAC_ISR_BP)
1536 ++st->rx_bad_packet;
1537 if (isr & EMAC_ISR_RP)
1538 ++st->rx_runt_packet;
1539 if (isr & EMAC_ISR_SE)
1540 ++st->rx_short_event;
1541 if (isr & EMAC_ISR_ALE)
1542 ++st->rx_alignment_error;
1543 if (isr & EMAC_ISR_BFCS)
1544 ++st->rx_bad_fcs;
1545 if (isr & EMAC_ISR_PTLE)
1546 ++st->rx_packet_too_long;
1547 if (isr & EMAC_ISR_ORE)
1548 ++st->rx_out_of_range;
1549 if (isr & EMAC_ISR_IRE)
1550 ++st->rx_in_range;
1551 if (isr & EMAC_ISR_SQE)
1552 ++st->tx_sqe;
1553 if (isr & EMAC_ISR_TE)
1554 ++st->tx_errors;
1555
1556 return IRQ_HANDLED;
1557 }
1558
1559 static struct net_device_stats *emac_stats(struct net_device *ndev)
1560 {
1561 struct ocp_enet_private *dev = ndev->priv;
1562 struct ibm_emac_stats *st = &dev->stats;
1563 struct ibm_emac_error_stats *est = &dev->estats;
1564 struct net_device_stats *nst = &dev->nstats;
1565
1566 DBG2("%d: stats" NL, dev->def->index);
1567
1568 /* Compute "legacy" statistics */
1569 local_irq_disable();
1570 nst->rx_packets = (unsigned long)st->rx_packets;
1571 nst->rx_bytes = (unsigned long)st->rx_bytes;
1572 nst->tx_packets = (unsigned long)st->tx_packets;
1573 nst->tx_bytes = (unsigned long)st->tx_bytes;
1574 nst->rx_dropped = (unsigned long)(est->rx_dropped_oom +
1575 est->rx_dropped_error +
1576 est->rx_dropped_resize +
1577 est->rx_dropped_mtu);
1578 nst->tx_dropped = (unsigned long)est->tx_dropped;
1579
1580 nst->rx_errors = (unsigned long)est->rx_bd_errors;
1581 nst->rx_fifo_errors = (unsigned long)(est->rx_bd_overrun +
1582 est->rx_fifo_overrun +
1583 est->rx_overrun);
1584 nst->rx_frame_errors = (unsigned long)(est->rx_bd_alignment_error +
1585 est->rx_alignment_error);
1586 nst->rx_crc_errors = (unsigned long)(est->rx_bd_bad_fcs +
1587 est->rx_bad_fcs);
1588 nst->rx_length_errors = (unsigned long)(est->rx_bd_runt_packet +
1589 est->rx_bd_short_event +
1590 est->rx_bd_packet_too_long +
1591 est->rx_bd_out_of_range +
1592 est->rx_bd_in_range +
1593 est->rx_runt_packet +
1594 est->rx_short_event +
1595 est->rx_packet_too_long +
1596 est->rx_out_of_range +
1597 est->rx_in_range);
1598
1599 nst->tx_errors = (unsigned long)(est->tx_bd_errors + est->tx_errors);
1600 nst->tx_fifo_errors = (unsigned long)(est->tx_bd_underrun +
1601 est->tx_underrun);
1602 nst->tx_carrier_errors = (unsigned long)est->tx_bd_carrier_loss;
1603 nst->collisions = (unsigned long)(est->tx_bd_excessive_deferral +
1604 est->tx_bd_excessive_collisions +
1605 est->tx_bd_late_collision +
1606 est->tx_bd_multple_collisions);
1607 local_irq_enable();
1608 return nst;
1609 }
1610
1611 static void emac_remove(struct ocp_device *ocpdev)
1612 {
1613 struct ocp_enet_private *dev = ocp_get_drvdata(ocpdev);
1614
1615 DBG("%d: remove" NL, dev->def->index);
1616
1617 ocp_set_drvdata(ocpdev, NULL);
1618 unregister_netdev(dev->ndev);
1619
1620 tah_fini(dev->tah_dev);
1621 rgmii_fini(dev->rgmii_dev, dev->rgmii_input);
1622 zmii_fini(dev->zmii_dev, dev->zmii_input);
1623
1624 emac_dbg_register(dev->def->index, NULL);
1625
1626 mal_unregister_commac(dev->mal, &dev->commac);
1627 iounmap(dev->emacp);
1628 kfree(dev->ndev);
1629 }
1630
1631 static struct mal_commac_ops emac_commac_ops = {
1632 .poll_tx = &emac_poll_tx,
1633 .poll_rx = &emac_poll_rx,
1634 .peek_rx = &emac_peek_rx,
1635 .rxde = &emac_rxde,
1636 };
1637
1638 static struct mal_commac_ops emac_commac_sg_ops = {
1639 .poll_tx = &emac_poll_tx,
1640 .poll_rx = &emac_poll_rx,
1641 .peek_rx = &emac_peek_rx_sg,
1642 .rxde = &emac_rxde,
1643 };
1644
1645 /* Ethtool support */
1646 static int emac_ethtool_get_settings(struct net_device *ndev,
1647 struct ethtool_cmd *cmd)
1648 {
1649 struct ocp_enet_private *dev = ndev->priv;
1650
1651 cmd->supported = dev->phy.features;
1652 cmd->port = PORT_MII;
1653 cmd->phy_address = dev->phy.address;
1654 cmd->transceiver =
1655 dev->phy.address >= 0 ? XCVR_EXTERNAL : XCVR_INTERNAL;
1656
1657 local_bh_disable();
1658 cmd->advertising = dev->phy.advertising;
1659 cmd->autoneg = dev->phy.autoneg;
1660 cmd->speed = dev->phy.speed;
1661 cmd->duplex = dev->phy.duplex;
1662 local_bh_enable();
1663
1664 return 0;
1665 }
1666
1667 static int emac_ethtool_set_settings(struct net_device *ndev,
1668 struct ethtool_cmd *cmd)
1669 {
1670 struct ocp_enet_private *dev = ndev->priv;
1671 u32 f = dev->phy.features;
1672
1673 DBG("%d: set_settings(%d, %d, %d, 0x%08x)" NL, dev->def->index,
1674 cmd->autoneg, cmd->speed, cmd->duplex, cmd->advertising);
1675
1676 /* Basic sanity checks */
1677 if (dev->phy.address < 0)
1678 return -EOPNOTSUPP;
1679 if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
1680 return -EINVAL;
1681 if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
1682 return -EINVAL;
1683 if (cmd->duplex != DUPLEX_HALF && cmd->duplex != DUPLEX_FULL)
1684 return -EINVAL;
1685
1686 if (cmd->autoneg == AUTONEG_DISABLE) {
1687 switch (cmd->speed) {
1688 case SPEED_10:
1689 if (cmd->duplex == DUPLEX_HALF
1690 && !(f & SUPPORTED_10baseT_Half))
1691 return -EINVAL;
1692 if (cmd->duplex == DUPLEX_FULL
1693 && !(f & SUPPORTED_10baseT_Full))
1694 return -EINVAL;
1695 break;
1696 case SPEED_100:
1697 if (cmd->duplex == DUPLEX_HALF
1698 && !(f & SUPPORTED_100baseT_Half))
1699 return -EINVAL;
1700 if (cmd->duplex == DUPLEX_FULL
1701 && !(f & SUPPORTED_100baseT_Full))
1702 return -EINVAL;
1703 break;
1704 case SPEED_1000:
1705 if (cmd->duplex == DUPLEX_HALF
1706 && !(f & SUPPORTED_1000baseT_Half))
1707 return -EINVAL;
1708 if (cmd->duplex == DUPLEX_FULL
1709 && !(f & SUPPORTED_1000baseT_Full))
1710 return -EINVAL;
1711 break;
1712 default:
1713 return -EINVAL;
1714 }
1715
1716 local_bh_disable();
1717 dev->phy.def->ops->setup_forced(&dev->phy, cmd->speed,
1718 cmd->duplex);
1719
1720 } else {
1721 if (!(f & SUPPORTED_Autoneg))
1722 return -EINVAL;
1723
1724 local_bh_disable();
1725 dev->phy.def->ops->setup_aneg(&dev->phy,
1726 (cmd->advertising & f) |
1727 (dev->phy.advertising &
1728 (ADVERTISED_Pause |
1729 ADVERTISED_Asym_Pause)));
1730 }
1731 emac_force_link_update(dev);
1732 local_bh_enable();
1733
1734 return 0;
1735 }
1736
1737 static void emac_ethtool_get_ringparam(struct net_device *ndev,
1738 struct ethtool_ringparam *rp)
1739 {
1740 rp->rx_max_pending = rp->rx_pending = NUM_RX_BUFF;
1741 rp->tx_max_pending = rp->tx_pending = NUM_TX_BUFF;
1742 }
1743
1744 static void emac_ethtool_get_pauseparam(struct net_device *ndev,
1745 struct ethtool_pauseparam *pp)
1746 {
1747 struct ocp_enet_private *dev = ndev->priv;
1748
1749 local_bh_disable();
1750 if ((dev->phy.features & SUPPORTED_Autoneg) &&
1751 (dev->phy.advertising & (ADVERTISED_Pause | ADVERTISED_Asym_Pause)))
1752 pp->autoneg = 1;
1753
1754 if (dev->phy.duplex == DUPLEX_FULL) {
1755 if (dev->phy.pause)
1756 pp->rx_pause = pp->tx_pause = 1;
1757 else if (dev->phy.asym_pause)
1758 pp->tx_pause = 1;
1759 }
1760 local_bh_enable();
1761 }
1762
1763 static u32 emac_ethtool_get_rx_csum(struct net_device *ndev)
1764 {
1765 struct ocp_enet_private *dev = ndev->priv;
1766 return dev->tah_dev != 0;
1767 }
1768
1769 static int emac_get_regs_len(struct ocp_enet_private *dev)
1770 {
1771 return sizeof(struct emac_ethtool_regs_subhdr) + EMAC_ETHTOOL_REGS_SIZE;
1772 }
1773
1774 static int emac_ethtool_get_regs_len(struct net_device *ndev)
1775 {
1776 struct ocp_enet_private *dev = ndev->priv;
1777 return sizeof(struct emac_ethtool_regs_hdr) +
1778 emac_get_regs_len(dev) + mal_get_regs_len(dev->mal) +
1779 zmii_get_regs_len(dev->zmii_dev) +
1780 rgmii_get_regs_len(dev->rgmii_dev) +
1781 tah_get_regs_len(dev->tah_dev);
1782 }
1783
1784 static void *emac_dump_regs(struct ocp_enet_private *dev, void *buf)
1785 {
1786 struct emac_ethtool_regs_subhdr *hdr = buf;
1787
1788 hdr->version = EMAC_ETHTOOL_REGS_VER;
1789 hdr->index = dev->def->index;
1790 memcpy_fromio(hdr + 1, dev->emacp, EMAC_ETHTOOL_REGS_SIZE);
1791 return ((void *)(hdr + 1) + EMAC_ETHTOOL_REGS_SIZE);
1792 }
1793
1794 static void emac_ethtool_get_regs(struct net_device *ndev,
1795 struct ethtool_regs *regs, void *buf)
1796 {
1797 struct ocp_enet_private *dev = ndev->priv;
1798 struct emac_ethtool_regs_hdr *hdr = buf;
1799
1800 hdr->components = 0;
1801 buf = hdr + 1;
1802
1803 local_irq_disable();
1804 buf = mal_dump_regs(dev->mal, buf);
1805 buf = emac_dump_regs(dev, buf);
1806 if (dev->zmii_dev) {
1807 hdr->components |= EMAC_ETHTOOL_REGS_ZMII;
1808 buf = zmii_dump_regs(dev->zmii_dev, buf);
1809 }
1810 if (dev->rgmii_dev) {
1811 hdr->components |= EMAC_ETHTOOL_REGS_RGMII;
1812 buf = rgmii_dump_regs(dev->rgmii_dev, buf);
1813 }
1814 if (dev->tah_dev) {
1815 hdr->components |= EMAC_ETHTOOL_REGS_TAH;
1816 buf = tah_dump_regs(dev->tah_dev, buf);
1817 }
1818 local_irq_enable();
1819 }
1820
1821 static int emac_ethtool_nway_reset(struct net_device *ndev)
1822 {
1823 struct ocp_enet_private *dev = ndev->priv;
1824 int res = 0;
1825
1826 DBG("%d: nway_reset" NL, dev->def->index);
1827
1828 if (dev->phy.address < 0)
1829 return -EOPNOTSUPP;
1830
1831 local_bh_disable();
1832 if (!dev->phy.autoneg) {
1833 res = -EINVAL;
1834 goto out;
1835 }
1836
1837 dev->phy.def->ops->setup_aneg(&dev->phy, dev->phy.advertising);
1838 emac_force_link_update(dev);
1839
1840 out:
1841 local_bh_enable();
1842 return res;
1843 }
1844
1845 static int emac_get_sset_count(struct net_device *ndev, int sset)
1846 {
1847 switch (sset) {
1848 case ETH_SS_STATS:
1849 return EMAC_ETHTOOL_STATS_COUNT;
1850 default:
1851 return -EOPNOTSUPP;
1852 }
1853 }
1854
1855 static void emac_ethtool_get_strings(struct net_device *ndev, u32 stringset,
1856 u8 * buf)
1857 {
1858 if (stringset == ETH_SS_STATS)
1859 memcpy(buf, &emac_stats_keys, sizeof(emac_stats_keys));
1860 }
1861
1862 static void emac_ethtool_get_ethtool_stats(struct net_device *ndev,
1863 struct ethtool_stats *estats,
1864 u64 * tmp_stats)
1865 {
1866 struct ocp_enet_private *dev = ndev->priv;
1867 local_irq_disable();
1868 memcpy(tmp_stats, &dev->stats, sizeof(dev->stats));
1869 tmp_stats += sizeof(dev->stats) / sizeof(u64);
1870 memcpy(tmp_stats, &dev->estats, sizeof(dev->estats));
1871 local_irq_enable();
1872 }
1873
1874 static void emac_ethtool_get_drvinfo(struct net_device *ndev,
1875 struct ethtool_drvinfo *info)
1876 {
1877 struct ocp_enet_private *dev = ndev->priv;
1878
1879 strcpy(info->driver, "ibm_emac");
1880 strcpy(info->version, DRV_VERSION);
1881 info->fw_version[0] = '\0';
1882 sprintf(info->bus_info, "PPC 4xx EMAC %d", dev->def->index);
1883 info->regdump_len = emac_ethtool_get_regs_len(ndev);
1884 }
1885
1886 static const struct ethtool_ops emac_ethtool_ops = {
1887 .get_settings = emac_ethtool_get_settings,
1888 .set_settings = emac_ethtool_set_settings,
1889 .get_drvinfo = emac_ethtool_get_drvinfo,
1890
1891 .get_regs_len = emac_ethtool_get_regs_len,
1892 .get_regs = emac_ethtool_get_regs,
1893
1894 .nway_reset = emac_ethtool_nway_reset,
1895
1896 .get_ringparam = emac_ethtool_get_ringparam,
1897 .get_pauseparam = emac_ethtool_get_pauseparam,
1898
1899 .get_rx_csum = emac_ethtool_get_rx_csum,
1900
1901 .get_strings = emac_ethtool_get_strings,
1902 .get_sset_count = emac_get_sset_count,
1903 .get_ethtool_stats = emac_ethtool_get_ethtool_stats,
1904
1905 .get_link = ethtool_op_get_link,
1906 };
1907
1908 static int emac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
1909 {
1910 struct ocp_enet_private *dev = ndev->priv;
1911 uint16_t *data = (uint16_t *) & rq->ifr_ifru;
1912
1913 DBG("%d: ioctl %08x" NL, dev->def->index, cmd);
1914
1915 if (dev->phy.address < 0)
1916 return -EOPNOTSUPP;
1917
1918 switch (cmd) {
1919 case SIOCGMIIPHY:
1920 case SIOCDEVPRIVATE:
1921 data[0] = dev->phy.address;
1922 /* Fall through */
1923 case SIOCGMIIREG:
1924 case SIOCDEVPRIVATE + 1:
1925 data[3] = emac_mdio_read(ndev, dev->phy.address, data[1]);
1926 return 0;
1927
1928 case SIOCSMIIREG:
1929 case SIOCDEVPRIVATE + 2:
1930 if (!capable(CAP_NET_ADMIN))
1931 return -EPERM;
1932 emac_mdio_write(ndev, dev->phy.address, data[1], data[2]);
1933 return 0;
1934 default:
1935 return -EOPNOTSUPP;
1936 }
1937 }
1938
1939 static int __init emac_probe(struct ocp_device *ocpdev)
1940 {
1941 struct ocp_func_emac_data *emacdata = ocpdev->def->additions;
1942 struct net_device *ndev;
1943 struct ocp_device *maldev;
1944 struct ocp_enet_private *dev;
1945 int err, i;
1946 DECLARE_MAC_BUF(mac);
1947
1948 DBG("%d: probe" NL, ocpdev->def->index);
1949
1950 if (!emacdata) {
1951 printk(KERN_ERR "emac%d: Missing additional data!\n",
1952 ocpdev->def->index);
1953 return -ENODEV;
1954 }
1955
1956 /* Allocate our net_device structure */
1957 ndev = alloc_etherdev(sizeof(struct ocp_enet_private));
1958 if (!ndev) {
1959 printk(KERN_ERR "emac%d: could not allocate ethernet device!\n",
1960 ocpdev->def->index);
1961 return -ENOMEM;
1962 }
1963 dev = ndev->priv;
1964 dev->ndev = ndev;
1965 dev->ldev = &ocpdev->dev;
1966 dev->def = ocpdev->def;
1967
1968 /* Find MAL device we are connected to */
1969 maldev =
1970 ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_MAL, emacdata->mal_idx);
1971 if (!maldev) {
1972 printk(KERN_ERR "emac%d: unknown mal%d device!\n",
1973 dev->def->index, emacdata->mal_idx);
1974 err = -ENODEV;
1975 goto out;
1976 }
1977 dev->mal = ocp_get_drvdata(maldev);
1978 if (!dev->mal) {
1979 printk(KERN_ERR "emac%d: mal%d hasn't been initialized yet!\n",
1980 dev->def->index, emacdata->mal_idx);
1981 err = -ENODEV;
1982 goto out;
1983 }
1984
1985 /* Register with MAL */
1986 dev->commac.ops = &emac_commac_ops;
1987 dev->commac.dev = dev;
1988 dev->commac.tx_chan_mask = MAL_CHAN_MASK(emacdata->mal_tx_chan);
1989 dev->commac.rx_chan_mask = MAL_CHAN_MASK(emacdata->mal_rx_chan);
1990 err = mal_register_commac(dev->mal, &dev->commac);
1991 if (err) {
1992 printk(KERN_ERR "emac%d: failed to register with mal%d!\n",
1993 dev->def->index, emacdata->mal_idx);
1994 goto out;
1995 }
1996 dev->rx_skb_size = emac_rx_skb_size(ndev->mtu);
1997 dev->rx_sync_size = emac_rx_sync_size(ndev->mtu);
1998
1999 /* Get pointers to BD rings */
2000 dev->tx_desc =
2001 dev->mal->bd_virt + mal_tx_bd_offset(dev->mal,
2002 emacdata->mal_tx_chan);
2003 dev->rx_desc =
2004 dev->mal->bd_virt + mal_rx_bd_offset(dev->mal,
2005 emacdata->mal_rx_chan);
2006
2007 DBG("%d: tx_desc %p" NL, ocpdev->def->index, dev->tx_desc);
2008 DBG("%d: rx_desc %p" NL, ocpdev->def->index, dev->rx_desc);
2009
2010 /* Clean rings */
2011 memset(dev->tx_desc, 0, NUM_TX_BUFF * sizeof(struct mal_descriptor));
2012 memset(dev->rx_desc, 0, NUM_RX_BUFF * sizeof(struct mal_descriptor));
2013
2014 /* If we depend on another EMAC for MDIO, check whether it was probed already */
2015 if (emacdata->mdio_idx >= 0 && emacdata->mdio_idx != ocpdev->def->index) {
2016 struct ocp_device *mdiodev =
2017 ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_EMAC,
2018 emacdata->mdio_idx);
2019 if (!mdiodev) {
2020 printk(KERN_ERR "emac%d: unknown emac%d device!\n",
2021 dev->def->index, emacdata->mdio_idx);
2022 err = -ENODEV;
2023 goto out2;
2024 }
2025 dev->mdio_dev = ocp_get_drvdata(mdiodev);
2026 if (!dev->mdio_dev) {
2027 printk(KERN_ERR
2028 "emac%d: emac%d hasn't been initialized yet!\n",
2029 dev->def->index, emacdata->mdio_idx);
2030 err = -ENODEV;
2031 goto out2;
2032 }
2033 }
2034
2035 /* Attach to ZMII, if needed */
2036 if ((err = zmii_attach(dev)) != 0)
2037 goto out2;
2038
2039 /* Attach to RGMII, if needed */
2040 if ((err = rgmii_attach(dev)) != 0)
2041 goto out3;
2042
2043 /* Attach to TAH, if needed */
2044 if ((err = tah_attach(dev)) != 0)
2045 goto out4;
2046
2047 /* Map EMAC regs */
2048 dev->emacp = ioremap(dev->def->paddr, sizeof(struct emac_regs));
2049 if (!dev->emacp) {
2050 printk(KERN_ERR "emac%d: could not ioremap device registers!\n",
2051 dev->def->index);
2052 err = -ENOMEM;
2053 goto out5;
2054 }
2055
2056 /* Fill in MAC address */
2057 for (i = 0; i < 6; ++i)
2058 ndev->dev_addr[i] = emacdata->mac_addr[i];
2059
2060 /* Set some link defaults before we can find out real parameters */
2061 dev->phy.speed = SPEED_100;
2062 dev->phy.duplex = DUPLEX_FULL;
2063 dev->phy.autoneg = AUTONEG_DISABLE;
2064 dev->phy.pause = dev->phy.asym_pause = 0;
2065 dev->stop_timeout = STOP_TIMEOUT_100;
2066 init_timer(&dev->link_timer);
2067 dev->link_timer.function = emac_link_timer;
2068 dev->link_timer.data = (unsigned long)dev;
2069
2070 /* Find PHY if any */
2071 dev->phy.dev = ndev;
2072 dev->phy.mode = emacdata->phy_mode;
2073 if (emacdata->phy_map != 0xffffffff) {
2074 u32 phy_map = emacdata->phy_map | busy_phy_map;
2075 u32 adv;
2076
2077 DBG("%d: PHY maps %08x %08x" NL, dev->def->index,
2078 emacdata->phy_map, busy_phy_map);
2079
2080 EMAC_RX_CLK_TX(dev->def->index);
2081
2082 dev->phy.mdio_read = emac_mdio_read;
2083 dev->phy.mdio_write = emac_mdio_write;
2084
2085 /* Configure EMAC with defaults so we can at least use MDIO
2086 * This is needed mostly for 440GX
2087 */
2088 if (emac_phy_gpcs(dev->phy.mode)) {
2089 /* XXX
2090 * Make GPCS PHY address equal to EMAC index.
2091 * We probably should take into account busy_phy_map
2092 * and/or phy_map here.
2093 */
2094 dev->phy.address = dev->def->index;
2095 }
2096
2097 emac_configure(dev);
2098
2099 for (i = 0; i < 0x20; phy_map >>= 1, ++i)
2100 if (!(phy_map & 1)) {
2101 int r;
2102 busy_phy_map |= 1 << i;
2103
2104 /* Quick check if there is a PHY at the address */
2105 r = emac_mdio_read(dev->ndev, i, MII_BMCR);
2106 if (r == 0xffff || r < 0)
2107 continue;
2108 if (!mii_phy_probe(&dev->phy, i))
2109 break;
2110 }
2111 if (i == 0x20) {
2112 printk(KERN_WARNING "emac%d: can't find PHY!\n",
2113 dev->def->index);
2114 goto out6;
2115 }
2116
2117 /* Init PHY */
2118 if (dev->phy.def->ops->init)
2119 dev->phy.def->ops->init(&dev->phy);
2120
2121 /* Disable any PHY features not supported by the platform */
2122 dev->phy.def->features &= ~emacdata->phy_feat_exc;
2123
2124 /* Setup initial link parameters */
2125 if (dev->phy.features & SUPPORTED_Autoneg) {
2126 adv = dev->phy.features;
2127 #if !defined(CONFIG_40x)
2128 adv |= ADVERTISED_Pause | ADVERTISED_Asym_Pause;
2129 #endif
2130 /* Restart autonegotiation */
2131 dev->phy.def->ops->setup_aneg(&dev->phy, adv);
2132 } else {
2133 u32 f = dev->phy.def->features;
2134 int speed = SPEED_10, fd = DUPLEX_HALF;
2135
2136 /* Select highest supported speed/duplex */
2137 if (f & SUPPORTED_1000baseT_Full) {
2138 speed = SPEED_1000;
2139 fd = DUPLEX_FULL;
2140 } else if (f & SUPPORTED_1000baseT_Half)
2141 speed = SPEED_1000;
2142 else if (f & SUPPORTED_100baseT_Full) {
2143 speed = SPEED_100;
2144 fd = DUPLEX_FULL;
2145 } else if (f & SUPPORTED_100baseT_Half)
2146 speed = SPEED_100;
2147 else if (f & SUPPORTED_10baseT_Full)
2148 fd = DUPLEX_FULL;
2149
2150 /* Force link parameters */
2151 dev->phy.def->ops->setup_forced(&dev->phy, speed, fd);
2152 }
2153 } else {
2154 emac_reset(dev);
2155
2156 /* PHY-less configuration.
2157 * XXX I probably should move these settings to emacdata
2158 */
2159 dev->phy.address = -1;
2160 dev->phy.features = SUPPORTED_100baseT_Full | SUPPORTED_MII;
2161 dev->phy.pause = 1;
2162 }
2163
2164 /* Fill in the driver function table */
2165 ndev->open = &emac_open;
2166 if (dev->tah_dev) {
2167 ndev->hard_start_xmit = &emac_start_xmit_sg;
2168 ndev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
2169 } else
2170 ndev->hard_start_xmit = &emac_start_xmit;
2171 ndev->tx_timeout = &emac_full_tx_reset;
2172 ndev->watchdog_timeo = 5 * HZ;
2173 ndev->stop = &emac_close;
2174 ndev->get_stats = &emac_stats;
2175 ndev->set_multicast_list = &emac_set_multicast_list;
2176 ndev->do_ioctl = &emac_ioctl;
2177 if (emac_phy_supports_gige(emacdata->phy_mode)) {
2178 ndev->change_mtu = &emac_change_mtu;
2179 dev->commac.ops = &emac_commac_sg_ops;
2180 }
2181 SET_ETHTOOL_OPS(ndev, &emac_ethtool_ops);
2182
2183 netif_carrier_off(ndev);
2184 netif_stop_queue(ndev);
2185
2186 err = register_netdev(ndev);
2187 if (err) {
2188 printk(KERN_ERR "emac%d: failed to register net device (%d)!\n",
2189 dev->def->index, err);
2190 goto out6;
2191 }
2192
2193 ocp_set_drvdata(ocpdev, dev);
2194
2195 printk("%s: emac%d, MAC %s\n",
2196 ndev->name, dev->def->index, print_mac(mac, ndev->dev_addr));
2197
2198 if (dev->phy.address >= 0)
2199 printk("%s: found %s PHY (0x%02x)\n", ndev->name,
2200 dev->phy.def->name, dev->phy.address);
2201
2202 emac_dbg_register(dev->def->index, dev);
2203
2204 return 0;
2205 out6:
2206 iounmap(dev->emacp);
2207 out5:
2208 tah_fini(dev->tah_dev);
2209 out4:
2210 rgmii_fini(dev->rgmii_dev, dev->rgmii_input);
2211 out3:
2212 zmii_fini(dev->zmii_dev, dev->zmii_input);
2213 out2:
2214 mal_unregister_commac(dev->mal, &dev->commac);
2215 out:
2216 kfree(ndev);
2217 return err;
2218 }
2219
2220 static struct ocp_device_id emac_ids[] = {
2221 { .vendor = OCP_VENDOR_IBM, .function = OCP_FUNC_EMAC },
2222 { .vendor = OCP_VENDOR_INVALID}
2223 };
2224
2225 static struct ocp_driver emac_driver = {
2226 .name = "emac",
2227 .id_table = emac_ids,
2228 .probe = emac_probe,
2229 .remove = emac_remove,
2230 };
2231
2232 static int __init emac_init(void)
2233 {
2234 printk(KERN_INFO DRV_DESC ", version " DRV_VERSION "\n");
2235
2236 DBG(": init" NL);
2237
2238 if (mal_init())
2239 return -ENODEV;
2240
2241 EMAC_CLK_INTERNAL;
2242 if (ocp_register_driver(&emac_driver)) {
2243 EMAC_CLK_EXTERNAL;
2244 ocp_unregister_driver(&emac_driver);
2245 mal_exit();
2246 return -ENODEV;
2247 }
2248 EMAC_CLK_EXTERNAL;
2249
2250 emac_init_debug();
2251 return 0;
2252 }
2253
2254 static void __exit emac_exit(void)
2255 {
2256 DBG(": exit" NL);
2257 ocp_unregister_driver(&emac_driver);
2258 mal_exit();
2259 emac_fini_debug();
2260 }
2261
2262 module_init(emac_init);
2263 module_exit(emac_exit);
WRT350N Kernel Patches