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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / ethernet / ibm / emac / core.c
blobb7fc17756c5148777f42bc51f15033378fbc3528
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * drivers/net/ethernet/ibm/emac/core.c
4 *
5 * Driver for PowerPC 4xx on-chip ethernet controller.
6 *
7 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
8 * <benh@kernel.crashing.org>
9 *
10 * Based on the arch/ppc version of the driver:
11 *
12 * Copyright (c) 2004, 2005 Zultys Technologies.
13 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
14 *
15 * Based on original work by
16 * Matt Porter <mporter@kernel.crashing.org>
17 * (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
18 * Armin Kuster <akuster@mvista.com>
19 * Johnnie Peters <jpeters@mvista.com>
20 */
21
22 #include <linux/module.h>
23 #include <linux/sched.h>
24 #include <linux/string.h>
25 #include <linux/errno.h>
26 #include <linux/delay.h>
27 #include <linux/types.h>
28 #include <linux/pci.h>
29 #include <linux/etherdevice.h>
30 #include <linux/skbuff.h>
31 #include <linux/crc32.h>
32 #include <linux/ethtool.h>
33 #include <linux/mii.h>
34 #include <linux/bitops.h>
35 #include <linux/workqueue.h>
36 #include <linux/of.h>
37 #include <linux/of_address.h>
38 #include <linux/of_irq.h>
39 #include <linux/of_net.h>
40 #include <linux/of_mdio.h>
41 #include <linux/slab.h>
42
43 #include <asm/processor.h>
44 #include <asm/io.h>
45 #include <asm/dma.h>
46 #include <linux/uaccess.h>
47 #include <asm/dcr.h>
48 #include <asm/dcr-regs.h>
49
50 #include "core.h"
51
52 /*
53 * Lack of dma_unmap_???? calls is intentional.
54 *
55 * API-correct usage requires additional support state information to be
56 * maintained for every RX and TX buffer descriptor (BD). Unfortunately, due to
57 * EMAC design (e.g. TX buffer passed from network stack can be split into
58 * several BDs, dma_map_single/dma_map_page can be used to map particular BD),
59 * maintaining such information will add additional overhead.
60 * Current DMA API implementation for 4xx processors only ensures cache coherency
61 * and dma_unmap_???? routines are empty and are likely to stay this way.
62 * I decided to omit dma_unmap_??? calls because I don't want to add additional
63 * complexity just for the sake of following some abstract API, when it doesn't
64 * add any real benefit to the driver. I understand that this decision maybe
65 * controversial, but I really tried to make code API-correct and efficient
66 * at the same time and didn't come up with code I liked :(. --ebs
67 */
68
69 #define DRV_NAME "emac"
70 #define DRV_VERSION "3.54"
71 #define DRV_DESC "PPC 4xx OCP EMAC driver"
72
73 MODULE_DESCRIPTION(DRV_DESC);
74 MODULE_AUTHOR
75 ("Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>");
76 MODULE_LICENSE("GPL");
77
78 /* minimum number of free TX descriptors required to wake up TX process */
79 #define EMAC_TX_WAKEUP_THRESH (NUM_TX_BUFF / 4)
80
81 /* If packet size is less than this number, we allocate small skb and copy packet
82 * contents into it instead of just sending original big skb up
83 */
84 #define EMAC_RX_COPY_THRESH CONFIG_IBM_EMAC_RX_COPY_THRESHOLD
85
86 /* Since multiple EMACs share MDIO lines in various ways, we need
87 * to avoid re-using the same PHY ID in cases where the arch didn't
88 * setup precise phy_map entries
89 *
90 * XXX This is something that needs to be reworked as we can have multiple
91 * EMAC "sets" (multiple ASICs containing several EMACs) though we can
92 * probably require in that case to have explicit PHY IDs in the device-tree
93 */
94 static u32 busy_phy_map;
95 static DEFINE_MUTEX(emac_phy_map_lock);
96
97 /* This is the wait queue used to wait on any event related to probe, that
98 * is discovery of MALs, other EMACs, ZMII/RGMIIs, etc...
99 */
100 static DECLARE_WAIT_QUEUE_HEAD(emac_probe_wait);
101
102 /* Having stable interface names is a doomed idea. However, it would be nice
103 * if we didn't have completely random interface names at boot too :-) It's
104 * just a matter of making everybody's life easier. Since we are doing
105 * threaded probing, it's a bit harder though. The base idea here is that
106 * we make up a list of all emacs in the device-tree before we register the
107 * driver. Every emac will then wait for the previous one in the list to
108 * initialize before itself. We should also keep that list ordered by
109 * cell_index.
110 * That list is only 4 entries long, meaning that additional EMACs don't
111 * get ordering guarantees unless EMAC_BOOT_LIST_SIZE is increased.
112 */
113
114 #define EMAC_BOOT_LIST_SIZE 4
115 static struct device_node *emac_boot_list[EMAC_BOOT_LIST_SIZE];
116
117 /* How long should I wait for dependent devices ? */
118 #define EMAC_PROBE_DEP_TIMEOUT (HZ * 5)
119
120 /* I don't want to litter system log with timeout errors
121 * when we have brain-damaged PHY.
122 */
123 static inline void emac_report_timeout_error(struct emac_instance *dev,
124 const char *error)
125 {
126 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX |
127 EMAC_FTR_460EX_PHY_CLK_FIX |
128 EMAC_FTR_440EP_PHY_CLK_FIX))
129 DBG(dev, "%s" NL, error);
130 else if (net_ratelimit())
131 printk(KERN_ERR "%pOF: %s\n", dev->ofdev->dev.of_node, error);
132 }
133
134 /* EMAC PHY clock workaround:
135 * 440EP/440GR has more sane SDR0_MFR register implementation than 440GX,
136 * which allows controlling each EMAC clock
137 */
138 static inline void emac_rx_clk_tx(struct emac_instance *dev)
139 {
140 #ifdef CONFIG_PPC_DCR_NATIVE
141 if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
142 dcri_clrset(SDR0, SDR0_MFR,
143 0, SDR0_MFR_ECS >> dev->cell_index);
144 #endif
145 }
146
147 static inline void emac_rx_clk_default(struct emac_instance *dev)
148 {
149 #ifdef CONFIG_PPC_DCR_NATIVE
150 if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
151 dcri_clrset(SDR0, SDR0_MFR,
152 SDR0_MFR_ECS >> dev->cell_index, 0);
153 #endif
154 }
155
156 /* PHY polling intervals */
157 #define PHY_POLL_LINK_ON HZ
158 #define PHY_POLL_LINK_OFF (HZ / 5)
159
160 /* Graceful stop timeouts in us.
161 * We should allow up to 1 frame time (full-duplex, ignoring collisions)
162 */
163 #define STOP_TIMEOUT_10 1230
164 #define STOP_TIMEOUT_100 124
165 #define STOP_TIMEOUT_1000 13
166 #define STOP_TIMEOUT_1000_JUMBO 73
167
168 static unsigned char default_mcast_addr[] = {
169 0x01, 0x80, 0xC2, 0x00, 0x00, 0x01
170 };
171
172 /* Please, keep in sync with struct ibm_emac_stats/ibm_emac_error_stats */
173 static const char emac_stats_keys[EMAC_ETHTOOL_STATS_COUNT][ETH_GSTRING_LEN] = {
174 "rx_packets", "rx_bytes", "tx_packets", "tx_bytes", "rx_packets_csum",
175 "tx_packets_csum", "tx_undo", "rx_dropped_stack", "rx_dropped_oom",
176 "rx_dropped_error", "rx_dropped_resize", "rx_dropped_mtu",
177 "rx_stopped", "rx_bd_errors", "rx_bd_overrun", "rx_bd_bad_packet",
178 "rx_bd_runt_packet", "rx_bd_short_event", "rx_bd_alignment_error",
179 "rx_bd_bad_fcs", "rx_bd_packet_too_long", "rx_bd_out_of_range",
180 "rx_bd_in_range", "rx_parity", "rx_fifo_overrun", "rx_overrun",
181 "rx_bad_packet", "rx_runt_packet", "rx_short_event",
182 "rx_alignment_error", "rx_bad_fcs", "rx_packet_too_long",
183 "rx_out_of_range", "rx_in_range", "tx_dropped", "tx_bd_errors",
184 "tx_bd_bad_fcs", "tx_bd_carrier_loss", "tx_bd_excessive_deferral",
185 "tx_bd_excessive_collisions", "tx_bd_late_collision",
186 "tx_bd_multple_collisions", "tx_bd_single_collision",
187 "tx_bd_underrun", "tx_bd_sqe", "tx_parity", "tx_underrun", "tx_sqe",
188 "tx_errors"
189 };
190
191 static irqreturn_t emac_irq(int irq, void *dev_instance);
192 static void emac_clean_tx_ring(struct emac_instance *dev);
193 static void __emac_set_multicast_list(struct emac_instance *dev);
194
195 static inline int emac_phy_supports_gige(int phy_mode)
196 {
197 return phy_interface_mode_is_rgmii(phy_mode) ||
198 phy_mode == PHY_INTERFACE_MODE_GMII ||
199 phy_mode == PHY_INTERFACE_MODE_SGMII ||
200 phy_mode == PHY_INTERFACE_MODE_TBI ||
201 phy_mode == PHY_INTERFACE_MODE_RTBI;
202 }
203
204 static inline int emac_phy_gpcs(int phy_mode)
205 {
206 return phy_mode == PHY_INTERFACE_MODE_SGMII ||
207 phy_mode == PHY_INTERFACE_MODE_TBI ||
208 phy_mode == PHY_INTERFACE_MODE_RTBI;
209 }
210
211 static inline void emac_tx_enable(struct emac_instance *dev)
212 {
213 struct emac_regs __iomem *p = dev->emacp;
214 u32 r;
215
216 DBG(dev, "tx_enable" NL);
217
218 r = in_be32(&p->mr0);
219 if (!(r & EMAC_MR0_TXE))
220 out_be32(&p->mr0, r | EMAC_MR0_TXE);
221 }
222
223 static void emac_tx_disable(struct emac_instance *dev)
224 {
225 struct emac_regs __iomem *p = dev->emacp;
226 u32 r;
227
228 DBG(dev, "tx_disable" NL);
229
230 r = in_be32(&p->mr0);
231 if (r & EMAC_MR0_TXE) {
232 int n = dev->stop_timeout;
233 out_be32(&p->mr0, r & ~EMAC_MR0_TXE);
234 while (!(in_be32(&p->mr0) & EMAC_MR0_TXI) && n) {
235 udelay(1);
236 --n;
237 }
238 if (unlikely(!n))
239 emac_report_timeout_error(dev, "TX disable timeout");
240 }
241 }
242
243 static void emac_rx_enable(struct emac_instance *dev)
244 {
245 struct emac_regs __iomem *p = dev->emacp;
246 u32 r;
247
248 if (unlikely(test_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags)))
249 goto out;
250
251 DBG(dev, "rx_enable" NL);
252
253 r = in_be32(&p->mr0);
254 if (!(r & EMAC_MR0_RXE)) {
255 if (unlikely(!(r & EMAC_MR0_RXI))) {
256 /* Wait if previous async disable is still in progress */
257 int n = dev->stop_timeout;
258 while (!(r = in_be32(&p->mr0) & EMAC_MR0_RXI) && n) {
259 udelay(1);
260 --n;
261 }
262 if (unlikely(!n))
263 emac_report_timeout_error(dev,
264 "RX disable timeout");
265 }
266 out_be32(&p->mr0, r | EMAC_MR0_RXE);
267 }
268 out:
269 ;
270 }
271
272 static void emac_rx_disable(struct emac_instance *dev)
273 {
274 struct emac_regs __iomem *p = dev->emacp;
275 u32 r;
276
277 DBG(dev, "rx_disable" NL);
278
279 r = in_be32(&p->mr0);
280 if (r & EMAC_MR0_RXE) {
281 int n = dev->stop_timeout;
282 out_be32(&p->mr0, r & ~EMAC_MR0_RXE);
283 while (!(in_be32(&p->mr0) & EMAC_MR0_RXI) && n) {
284 udelay(1);
285 --n;
286 }
287 if (unlikely(!n))
288 emac_report_timeout_error(dev, "RX disable timeout");
289 }
290 }
291
292 static inline void emac_netif_stop(struct emac_instance *dev)
293 {
294 netif_tx_lock_bh(dev->ndev);
295 netif_addr_lock(dev->ndev);
296 dev->no_mcast = 1;
297 netif_addr_unlock(dev->ndev);
298 netif_tx_unlock_bh(dev->ndev);
299 netif_trans_update(dev->ndev); /* prevent tx timeout */
300 mal_poll_disable(dev->mal, &dev->commac);
301 netif_tx_disable(dev->ndev);
302 }
303
304 static inline void emac_netif_start(struct emac_instance *dev)
305 {
306 netif_tx_lock_bh(dev->ndev);
307 netif_addr_lock(dev->ndev);
308 dev->no_mcast = 0;
309 if (dev->mcast_pending && netif_running(dev->ndev))
310 __emac_set_multicast_list(dev);
311 netif_addr_unlock(dev->ndev);
312 netif_tx_unlock_bh(dev->ndev);
313
314 netif_wake_queue(dev->ndev);
315
316 /* NOTE: unconditional netif_wake_queue is only appropriate
317 * so long as all callers are assured to have free tx slots
318 * (taken from tg3... though the case where that is wrong is
319 * not terribly harmful)
320 */
321 mal_poll_enable(dev->mal, &dev->commac);
322 }
323
324 static inline void emac_rx_disable_async(struct emac_instance *dev)
325 {
326 struct emac_regs __iomem *p = dev->emacp;
327 u32 r;
328
329 DBG(dev, "rx_disable_async" NL);
330
331 r = in_be32(&p->mr0);
332 if (r & EMAC_MR0_RXE)
333 out_be32(&p->mr0, r & ~EMAC_MR0_RXE);
334 }
335
336 static int emac_reset(struct emac_instance *dev)
337 {
338 struct emac_regs __iomem *p = dev->emacp;
339 int n = 20;
340 bool __maybe_unused try_internal_clock = false;
341
342 DBG(dev, "reset" NL);
343
344 if (!dev->reset_failed) {
345 /* 40x erratum suggests stopping RX channel before reset,
346 * we stop TX as well
347 */
348 emac_rx_disable(dev);
349 emac_tx_disable(dev);
350 }
351
352 #ifdef CONFIG_PPC_DCR_NATIVE
353 do_retry:
354 /*
355 * PPC460EX/GT Embedded Processor Advanced User's Manual
356 * section 28.10.1 Mode Register 0 (EMACx_MR0) states:
357 * Note: The PHY must provide a TX Clk in order to perform a soft reset
358 * of the EMAC. If none is present, select the internal clock
359 * (SDR0_ETH_CFG[EMACx_PHY_CLK] = 1).
360 * After a soft reset, select the external clock.
361 *
362 * The AR8035-A PHY Meraki MR24 does not provide a TX Clk if the
363 * ethernet cable is not attached. This causes the reset to timeout
364 * and the PHY detection code in emac_init_phy() is unable to
365 * communicate and detect the AR8035-A PHY. As a result, the emac
366 * driver bails out early and the user has no ethernet.
367 * In order to stay compatible with existing configurations, the
368 * driver will temporarily switch to the internal clock, after
369 * the first reset fails.
370 */
371 if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX)) {
372 if (try_internal_clock || (dev->phy_address == 0xffffffff &&
373 dev->phy_map == 0xffffffff)) {
374 /* No PHY: select internal loop clock before reset */
375 dcri_clrset(SDR0, SDR0_ETH_CFG,
376 0, SDR0_ETH_CFG_ECS << dev->cell_index);
377 } else {
378 /* PHY present: select external clock before reset */
379 dcri_clrset(SDR0, SDR0_ETH_CFG,
380 SDR0_ETH_CFG_ECS << dev->cell_index, 0);
381 }
382 }
383 #endif
384
385 out_be32(&p->mr0, EMAC_MR0_SRST);
386 while ((in_be32(&p->mr0) & EMAC_MR0_SRST) && n)
387 --n;
388
389 #ifdef CONFIG_PPC_DCR_NATIVE
390 if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX)) {
391 if (!n && !try_internal_clock) {
392 /* first attempt has timed out. */
393 n = 20;
394 try_internal_clock = true;
395 goto do_retry;
396 }
397
398 if (try_internal_clock || (dev->phy_address == 0xffffffff &&
399 dev->phy_map == 0xffffffff)) {
400 /* No PHY: restore external clock source after reset */
401 dcri_clrset(SDR0, SDR0_ETH_CFG,
402 SDR0_ETH_CFG_ECS << dev->cell_index, 0);
403 }
404 }
405 #endif
406
407 if (n) {
408 dev->reset_failed = 0;
409 return 0;
410 } else {
411 emac_report_timeout_error(dev, "reset timeout");
412 dev->reset_failed = 1;
413 return -ETIMEDOUT;
414 }
415 }
416
417 static void emac_hash_mc(struct emac_instance *dev)
418 {
419 const int regs = EMAC_XAHT_REGS(dev);
420 u32 *gaht_base = emac_gaht_base(dev);
421 u32 gaht_temp[EMAC_XAHT_MAX_REGS];
422 struct netdev_hw_addr *ha;
423 int i;
424
425 DBG(dev, "hash_mc %d" NL, netdev_mc_count(dev->ndev));
426
427 memset(gaht_temp, 0, sizeof (gaht_temp));
428
429 netdev_for_each_mc_addr(ha, dev->ndev) {
430 int slot, reg, mask;
431 DBG2(dev, "mc %pM" NL, ha->addr);
432
433 slot = EMAC_XAHT_CRC_TO_SLOT(dev,
434 ether_crc(ETH_ALEN, ha->addr));
435 reg = EMAC_XAHT_SLOT_TO_REG(dev, slot);
436 mask = EMAC_XAHT_SLOT_TO_MASK(dev, slot);
437
438 gaht_temp[reg] |= mask;
439 }
440
441 for (i = 0; i < regs; i++)
442 out_be32(gaht_base + i, gaht_temp[i]);
443 }
444
445 static inline u32 emac_iff2rmr(struct net_device *ndev)
446 {
447 struct emac_instance *dev = netdev_priv(ndev);
448 u32 r;
449
450 r = EMAC_RMR_SP | EMAC_RMR_SFCS | EMAC_RMR_IAE | EMAC_RMR_BAE;
451
452 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
453 r |= EMAC4_RMR_BASE;
454 else
455 r |= EMAC_RMR_BASE;
456
457 if (ndev->flags & IFF_PROMISC)
458 r |= EMAC_RMR_PME;
459 else if (ndev->flags & IFF_ALLMULTI ||
460 (netdev_mc_count(ndev) > EMAC_XAHT_SLOTS(dev)))
461 r |= EMAC_RMR_PMME;
462 else if (!netdev_mc_empty(ndev))
463 r |= EMAC_RMR_MAE;
464
465 if (emac_has_feature(dev, EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE)) {
466 r &= ~EMAC4_RMR_MJS_MASK;
467 r |= EMAC4_RMR_MJS(ndev->mtu);
468 }
469
470 return r;
471 }
472
473 static u32 __emac_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_size)
474 {
475 u32 ret = EMAC_MR1_VLE | EMAC_MR1_IST | EMAC_MR1_TR0_MULT;
476
477 DBG2(dev, "__emac_calc_base_mr1" NL);
478
479 switch(tx_size) {
480 case 2048:
481 ret |= EMAC_MR1_TFS_2K;
482 break;
483 default:
484 printk(KERN_WARNING "%s: Unknown Tx FIFO size %d\n",
485 dev->ndev->name, tx_size);
486 }
487
488 switch(rx_size) {
489 case 16384:
490 ret |= EMAC_MR1_RFS_16K;
491 break;
492 case 4096:
493 ret |= EMAC_MR1_RFS_4K;
494 break;
495 default:
496 printk(KERN_WARNING "%s: Unknown Rx FIFO size %d\n",
497 dev->ndev->name, rx_size);
498 }
499
500 return ret;
501 }
502
503 static u32 __emac4_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_size)
504 {
505 u32 ret = EMAC_MR1_VLE | EMAC_MR1_IST | EMAC4_MR1_TR |
506 EMAC4_MR1_OBCI(dev->opb_bus_freq / 1000000);
507
508 DBG2(dev, "__emac4_calc_base_mr1" NL);
509
510 switch(tx_size) {
511 case 16384:
512 ret |= EMAC4_MR1_TFS_16K;
513 break;
514 case 8192:
515 ret |= EMAC4_MR1_TFS_8K;
516 break;
517 case 4096:
518 ret |= EMAC4_MR1_TFS_4K;
519 break;
520 case 2048:
521 ret |= EMAC4_MR1_TFS_2K;
522 break;
523 default:
524 printk(KERN_WARNING "%s: Unknown Tx FIFO size %d\n",
525 dev->ndev->name, tx_size);
526 }
527
528 switch(rx_size) {
529 case 16384:
530 ret |= EMAC4_MR1_RFS_16K;
531 break;
532 case 8192:
533 ret |= EMAC4_MR1_RFS_8K;
534 break;
535 case 4096:
536 ret |= EMAC4_MR1_RFS_4K;
537 break;
538 case 2048:
539 ret |= EMAC4_MR1_RFS_2K;
540 break;
541 default:
542 printk(KERN_WARNING "%s: Unknown Rx FIFO size %d\n",
543 dev->ndev->name, rx_size);
544 }
545
546 return ret;
547 }
548
549 static u32 emac_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_size)
550 {
551 return emac_has_feature(dev, EMAC_FTR_EMAC4) ?
552 __emac4_calc_base_mr1(dev, tx_size, rx_size) :
553 __emac_calc_base_mr1(dev, tx_size, rx_size);
554 }
555
556 static inline u32 emac_calc_trtr(struct emac_instance *dev, unsigned int size)
557 {
558 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
559 return ((size >> 6) - 1) << EMAC_TRTR_SHIFT_EMAC4;
560 else
561 return ((size >> 6) - 1) << EMAC_TRTR_SHIFT;
562 }
563
564 static inline u32 emac_calc_rwmr(struct emac_instance *dev,
565 unsigned int low, unsigned int high)
566 {
567 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
568 return (low << 22) | ( (high & 0x3ff) << 6);
569 else
570 return (low << 23) | ( (high & 0x1ff) << 7);
571 }
572
573 static int emac_configure(struct emac_instance *dev)
574 {
575 struct emac_regs __iomem *p = dev->emacp;
576 struct net_device *ndev = dev->ndev;
577 int tx_size, rx_size, link = netif_carrier_ok(dev->ndev);
578 u32 r, mr1 = 0;
579
580 DBG(dev, "configure" NL);
581
582 if (!link) {
583 out_be32(&p->mr1, in_be32(&p->mr1)
584 | EMAC_MR1_FDE | EMAC_MR1_ILE);
585 udelay(100);
586 } else if (emac_reset(dev) < 0)
587 return -ETIMEDOUT;
588
589 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
590 tah_reset(dev->tah_dev);
591
592 DBG(dev, " link = %d duplex = %d, pause = %d, asym_pause = %d\n",
593 link, dev->phy.duplex, dev->phy.pause, dev->phy.asym_pause);
594
595 /* Default fifo sizes */
596 tx_size = dev->tx_fifo_size;
597 rx_size = dev->rx_fifo_size;
598
599 /* No link, force loopback */
600 if (!link)
601 mr1 = EMAC_MR1_FDE | EMAC_MR1_ILE;
602
603 /* Check for full duplex */
604 else if (dev->phy.duplex == DUPLEX_FULL)
605 mr1 |= EMAC_MR1_FDE | EMAC_MR1_MWSW_001;
606
607 /* Adjust fifo sizes, mr1 and timeouts based on link speed */
608 dev->stop_timeout = STOP_TIMEOUT_10;
609 switch (dev->phy.speed) {
610 case SPEED_1000:
611 if (emac_phy_gpcs(dev->phy.mode)) {
612 mr1 |= EMAC_MR1_MF_1000GPCS | EMAC_MR1_MF_IPPA(
613 (dev->phy.gpcs_address != 0xffffffff) ?
614 dev->phy.gpcs_address : dev->phy.address);
615
616 /* Put some arbitrary OUI, Manuf & Rev IDs so we can
617 * identify this GPCS PHY later.
618 */
619 out_be32(&p->u1.emac4.ipcr, 0xdeadbeef);
620 } else
621 mr1 |= EMAC_MR1_MF_1000;
622
623 /* Extended fifo sizes */
624 tx_size = dev->tx_fifo_size_gige;
625 rx_size = dev->rx_fifo_size_gige;
626
627 if (dev->ndev->mtu > ETH_DATA_LEN) {
628 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
629 mr1 |= EMAC4_MR1_JPSM;
630 else
631 mr1 |= EMAC_MR1_JPSM;
632 dev->stop_timeout = STOP_TIMEOUT_1000_JUMBO;
633 } else
634 dev->stop_timeout = STOP_TIMEOUT_1000;
635 break;
636 case SPEED_100:
637 mr1 |= EMAC_MR1_MF_100;
638 dev->stop_timeout = STOP_TIMEOUT_100;
639 break;
640 default: /* make gcc happy */
641 break;
642 }
643
644 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
645 rgmii_set_speed(dev->rgmii_dev, dev->rgmii_port,
646 dev->phy.speed);
647 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
648 zmii_set_speed(dev->zmii_dev, dev->zmii_port, dev->phy.speed);
649
650 /* on 40x erratum forces us to NOT use integrated flow control,
651 * let's hope it works on 44x ;)
652 */
653 if (!emac_has_feature(dev, EMAC_FTR_NO_FLOW_CONTROL_40x) &&
654 dev->phy.duplex == DUPLEX_FULL) {
655 if (dev->phy.pause)
656 mr1 |= EMAC_MR1_EIFC | EMAC_MR1_APP;
657 else if (dev->phy.asym_pause)
658 mr1 |= EMAC_MR1_APP;
659 }
660
661 /* Add base settings & fifo sizes & program MR1 */
662 mr1 |= emac_calc_base_mr1(dev, tx_size, rx_size);
663 out_be32(&p->mr1, mr1);
664
665 /* Set individual MAC address */
666 out_be32(&p->iahr, (ndev->dev_addr[0] << 8) | ndev->dev_addr[1]);
667 out_be32(&p->ialr, (ndev->dev_addr[2] << 24) |
668 (ndev->dev_addr[3] << 16) | (ndev->dev_addr[4] << 8) |
669 ndev->dev_addr[5]);
670
671 /* VLAN Tag Protocol ID */
672 out_be32(&p->vtpid, 0x8100);
673
674 /* Receive mode register */
675 r = emac_iff2rmr(ndev);
676 if (r & EMAC_RMR_MAE)
677 emac_hash_mc(dev);
678 out_be32(&p->rmr, r);
679
680 /* FIFOs thresholds */
681 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
682 r = EMAC4_TMR1((dev->mal_burst_size / dev->fifo_entry_size) + 1,
683 tx_size / 2 / dev->fifo_entry_size);
684 else
685 r = EMAC_TMR1((dev->mal_burst_size / dev->fifo_entry_size) + 1,
686 tx_size / 2 / dev->fifo_entry_size);
687 out_be32(&p->tmr1, r);
688 out_be32(&p->trtr, emac_calc_trtr(dev, tx_size / 2));
689
690 /* PAUSE frame is sent when RX FIFO reaches its high-water mark,
691 there should be still enough space in FIFO to allow the our link
692 partner time to process this frame and also time to send PAUSE
693 frame itself.
694
695 Here is the worst case scenario for the RX FIFO "headroom"
696 (from "The Switch Book") (100Mbps, without preamble, inter-frame gap):
697
698 1) One maximum-length frame on TX 1522 bytes
699 2) One PAUSE frame time 64 bytes
700 3) PAUSE frame decode time allowance 64 bytes
701 4) One maximum-length frame on RX 1522 bytes
702 5) Round-trip propagation delay of the link (100Mb) 15 bytes
703 ----------
704 3187 bytes
705
706 I chose to set high-water mark to RX_FIFO_SIZE / 4 (1024 bytes)
707 low-water mark to RX_FIFO_SIZE / 8 (512 bytes)
708 */
709 r = emac_calc_rwmr(dev, rx_size / 8 / dev->fifo_entry_size,
710 rx_size / 4 / dev->fifo_entry_size);
711 out_be32(&p->rwmr, r);
712
713 /* Set PAUSE timer to the maximum */
714 out_be32(&p->ptr, 0xffff);
715
716 /* IRQ sources */
717 r = EMAC_ISR_OVR | EMAC_ISR_BP | EMAC_ISR_SE |
718 EMAC_ISR_ALE | EMAC_ISR_BFCS | EMAC_ISR_PTLE | EMAC_ISR_ORE |
719 EMAC_ISR_IRE | EMAC_ISR_TE;
720 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
721 r |= EMAC4_ISR_TXPE | EMAC4_ISR_RXPE /* | EMAC4_ISR_TXUE |
722 EMAC4_ISR_RXOE | */;
723 out_be32(&p->iser, r);
724
725 /* We need to take GPCS PHY out of isolate mode after EMAC reset */
726 if (emac_phy_gpcs(dev->phy.mode)) {
727 if (dev->phy.gpcs_address != 0xffffffff)
728 emac_mii_reset_gpcs(&dev->phy);
729 else
730 emac_mii_reset_phy(&dev->phy);
731 }
732
733 return 0;
734 }
735
736 static void emac_reinitialize(struct emac_instance *dev)
737 {
738 DBG(dev, "reinitialize" NL);
739
740 emac_netif_stop(dev);
741 if (!emac_configure(dev)) {
742 emac_tx_enable(dev);
743 emac_rx_enable(dev);
744 }
745 emac_netif_start(dev);
746 }
747
748 static void emac_full_tx_reset(struct emac_instance *dev)
749 {
750 DBG(dev, "full_tx_reset" NL);
751
752 emac_tx_disable(dev);
753 mal_disable_tx_channel(dev->mal, dev->mal_tx_chan);
754 emac_clean_tx_ring(dev);
755 dev->tx_cnt = dev->tx_slot = dev->ack_slot = 0;
756
757 emac_configure(dev);
758
759 mal_enable_tx_channel(dev->mal, dev->mal_tx_chan);
760 emac_tx_enable(dev);
761 emac_rx_enable(dev);
762 }
763
764 static void emac_reset_work(struct work_struct *work)
765 {
766 struct emac_instance *dev = container_of(work, struct emac_instance, reset_work);
767
768 DBG(dev, "reset_work" NL);
769
770 mutex_lock(&dev->link_lock);
771 if (dev->opened) {
772 emac_netif_stop(dev);
773 emac_full_tx_reset(dev);
774 emac_netif_start(dev);
775 }
776 mutex_unlock(&dev->link_lock);
777 }
778
779 static void emac_tx_timeout(struct net_device *ndev, unsigned int txqueue)
780 {
781 struct emac_instance *dev = netdev_priv(ndev);
782
783 DBG(dev, "tx_timeout" NL);
784
785 schedule_work(&dev->reset_work);
786 }
787
788
789 static inline int emac_phy_done(struct emac_instance *dev, u32 stacr)
790 {
791 int done = !!(stacr & EMAC_STACR_OC);
792
793 if (emac_has_feature(dev, EMAC_FTR_STACR_OC_INVERT))
794 done = !done;
795
796 return done;
797 };
798
799 static int __emac_mdio_read(struct emac_instance *dev, u8 id, u8 reg)
800 {
801 struct emac_regs __iomem *p = dev->emacp;
802 u32 r = 0;
803 int n, err = -ETIMEDOUT;
804
805 mutex_lock(&dev->mdio_lock);
806
807 DBG2(dev, "mdio_read(%02x,%02x)" NL, id, reg);
808
809 /* Enable proper MDIO port */
810 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
811 zmii_get_mdio(dev->zmii_dev, dev->zmii_port);
812 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
813 rgmii_get_mdio(dev->rgmii_dev, dev->rgmii_port);
814
815 /* Wait for management interface to become idle */
816 n = 20;
817 while (!emac_phy_done(dev, in_be32(&p->stacr))) {
818 udelay(1);
819 if (!--n) {
820 DBG2(dev, " -> timeout wait idle\n");
821 goto bail;
822 }
823 }
824
825 /* Issue read command */
826 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
827 r = EMAC4_STACR_BASE(dev->opb_bus_freq);
828 else
829 r = EMAC_STACR_BASE(dev->opb_bus_freq);
830 if (emac_has_feature(dev, EMAC_FTR_STACR_OC_INVERT))
831 r |= EMAC_STACR_OC;
832 if (emac_has_feature(dev, EMAC_FTR_HAS_NEW_STACR))
833 r |= EMACX_STACR_STAC_READ;
834 else
835 r |= EMAC_STACR_STAC_READ;
836 r |= (reg & EMAC_STACR_PRA_MASK)
837 | ((id & EMAC_STACR_PCDA_MASK) << EMAC_STACR_PCDA_SHIFT);
838 out_be32(&p->stacr, r);
839
840 /* Wait for read to complete */
841 n = 200;
842 while (!emac_phy_done(dev, (r = in_be32(&p->stacr)))) {
843 udelay(1);
844 if (!--n) {
845 DBG2(dev, " -> timeout wait complete\n");
846 goto bail;
847 }
848 }
849
850 if (unlikely(r & EMAC_STACR_PHYE)) {
851 DBG(dev, "mdio_read(%02x, %02x) failed" NL, id, reg);
852 err = -EREMOTEIO;
853 goto bail;
854 }
855
856 r = ((r >> EMAC_STACR_PHYD_SHIFT) & EMAC_STACR_PHYD_MASK);
857
858 DBG2(dev, "mdio_read -> %04x" NL, r);
859 err = 0;
860 bail:
861 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
862 rgmii_put_mdio(dev->rgmii_dev, dev->rgmii_port);
863 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
864 zmii_put_mdio(dev->zmii_dev, dev->zmii_port);
865 mutex_unlock(&dev->mdio_lock);
866
867 return err == 0 ? r : err;
868 }
869
870 static void __emac_mdio_write(struct emac_instance *dev, u8 id, u8 reg,
871 u16 val)
872 {
873 struct emac_regs __iomem *p = dev->emacp;
874 u32 r = 0;
875 int n, err = -ETIMEDOUT;
876
877 mutex_lock(&dev->mdio_lock);
878
879 DBG2(dev, "mdio_write(%02x,%02x,%04x)" NL, id, reg, val);
880
881 /* Enable proper MDIO port */
882 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
883 zmii_get_mdio(dev->zmii_dev, dev->zmii_port);
884 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
885 rgmii_get_mdio(dev->rgmii_dev, dev->rgmii_port);
886
887 /* Wait for management interface to be idle */
888 n = 20;
889 while (!emac_phy_done(dev, in_be32(&p->stacr))) {
890 udelay(1);
891 if (!--n) {
892 DBG2(dev, " -> timeout wait idle\n");
893 goto bail;
894 }
895 }
896
897 /* Issue write command */
898 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
899 r = EMAC4_STACR_BASE(dev->opb_bus_freq);
900 else
901 r = EMAC_STACR_BASE(dev->opb_bus_freq);
902 if (emac_has_feature(dev, EMAC_FTR_STACR_OC_INVERT))
903 r |= EMAC_STACR_OC;
904 if (emac_has_feature(dev, EMAC_FTR_HAS_NEW_STACR))
905 r |= EMACX_STACR_STAC_WRITE;
906 else
907 r |= EMAC_STACR_STAC_WRITE;
908 r |= (reg & EMAC_STACR_PRA_MASK) |
909 ((id & EMAC_STACR_PCDA_MASK) << EMAC_STACR_PCDA_SHIFT) |
910 (val << EMAC_STACR_PHYD_SHIFT);
911 out_be32(&p->stacr, r);
912
913 /* Wait for write to complete */
914 n = 200;
915 while (!emac_phy_done(dev, in_be32(&p->stacr))) {
916 udelay(1);
917 if (!--n) {
918 DBG2(dev, " -> timeout wait complete\n");
919 goto bail;
920 }
921 }
922 err = 0;
923 bail:
924 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
925 rgmii_put_mdio(dev->rgmii_dev, dev->rgmii_port);
926 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
927 zmii_put_mdio(dev->zmii_dev, dev->zmii_port);
928 mutex_unlock(&dev->mdio_lock);
929 }
930
931 static int emac_mdio_read(struct net_device *ndev, int id, int reg)
932 {
933 struct emac_instance *dev = netdev_priv(ndev);
934 int res;
935
936 res = __emac_mdio_read((dev->mdio_instance &&
937 dev->phy.gpcs_address != id) ?
938 dev->mdio_instance : dev,
939 (u8) id, (u8) reg);
940 return res;
941 }
942
943 static void emac_mdio_write(struct net_device *ndev, int id, int reg, int val)
944 {
945 struct emac_instance *dev = netdev_priv(ndev);
946
947 __emac_mdio_write((dev->mdio_instance &&
948 dev->phy.gpcs_address != id) ?
949 dev->mdio_instance : dev,
950 (u8) id, (u8) reg, (u16) val);
951 }
952
953 /* Tx lock BH */
954 static void __emac_set_multicast_list(struct emac_instance *dev)
955 {
956 struct emac_regs __iomem *p = dev->emacp;
957 u32 rmr = emac_iff2rmr(dev->ndev);
958
959 DBG(dev, "__multicast %08x" NL, rmr);
960
961 /* I decided to relax register access rules here to avoid
962 * full EMAC reset.
963 *
964 * There is a real problem with EMAC4 core if we use MWSW_001 bit
965 * in MR1 register and do a full EMAC reset.
966 * One TX BD status update is delayed and, after EMAC reset, it
967 * never happens, resulting in TX hung (it'll be recovered by TX
968 * timeout handler eventually, but this is just gross).
969 * So we either have to do full TX reset or try to cheat here :)
970 *
971 * The only required change is to RX mode register, so I *think* all
972 * we need is just to stop RX channel. This seems to work on all
973 * tested SoCs. --ebs
974 *
975 * If we need the full reset, we might just trigger the workqueue
976 * and do it async... a bit nasty but should work --BenH
977 */
978 dev->mcast_pending = 0;
979 emac_rx_disable(dev);
980 if (rmr & EMAC_RMR_MAE)
981 emac_hash_mc(dev);
982 out_be32(&p->rmr, rmr);
983 emac_rx_enable(dev);
984 }
985
986 /* Tx lock BH */
987 static void emac_set_multicast_list(struct net_device *ndev)
988 {
989 struct emac_instance *dev = netdev_priv(ndev);
990
991 DBG(dev, "multicast" NL);
992
993 BUG_ON(!netif_running(dev->ndev));
994
995 if (dev->no_mcast) {
996 dev->mcast_pending = 1;
997 return;
998 }
999
1000 mutex_lock(&dev->link_lock);
1001 __emac_set_multicast_list(dev);
1002 mutex_unlock(&dev->link_lock);
1003 }
1004
1005 static int emac_set_mac_address(struct net_device *ndev, void *sa)
1006 {
1007 struct emac_instance *dev = netdev_priv(ndev);
1008 struct sockaddr *addr = sa;
1009 struct emac_regs __iomem *p = dev->emacp;
1010
1011 if (!is_valid_ether_addr(addr->sa_data))
1012 return -EADDRNOTAVAIL;
1013
1014 mutex_lock(&dev->link_lock);
1015
1016 memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
1017
1018 emac_rx_disable(dev);
1019 emac_tx_disable(dev);
1020 out_be32(&p->iahr, (ndev->dev_addr[0] << 8) | ndev->dev_addr[1]);
1021 out_be32(&p->ialr, (ndev->dev_addr[2] << 24) |
1022 (ndev->dev_addr[3] << 16) | (ndev->dev_addr[4] << 8) |
1023 ndev->dev_addr[5]);
1024 emac_tx_enable(dev);
1025 emac_rx_enable(dev);
1026
1027 mutex_unlock(&dev->link_lock);
1028
1029 return 0;
1030 }
1031
1032 static int emac_resize_rx_ring(struct emac_instance *dev, int new_mtu)
1033 {
1034 int rx_sync_size = emac_rx_sync_size(new_mtu);
1035 int rx_skb_size = emac_rx_skb_size(new_mtu);
1036 int i, ret = 0;
1037 int mr1_jumbo_bit_change = 0;
1038
1039 mutex_lock(&dev->link_lock);
1040 emac_netif_stop(dev);
1041 emac_rx_disable(dev);
1042 mal_disable_rx_channel(dev->mal, dev->mal_rx_chan);
1043
1044 if (dev->rx_sg_skb) {
1045 ++dev->estats.rx_dropped_resize;
1046 dev_kfree_skb(dev->rx_sg_skb);
1047 dev->rx_sg_skb = NULL;
1048 }
1049
1050 /* Make a first pass over RX ring and mark BDs ready, dropping
1051 * non-processed packets on the way. We need this as a separate pass
1052 * to simplify error recovery in the case of allocation failure later.
1053 */
1054 for (i = 0; i < NUM_RX_BUFF; ++i) {
1055 if (dev->rx_desc[i].ctrl & MAL_RX_CTRL_FIRST)
1056 ++dev->estats.rx_dropped_resize;
1057
1058 dev->rx_desc[i].data_len = 0;
1059 dev->rx_desc[i].ctrl = MAL_RX_CTRL_EMPTY |
1060 (i == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1061 }
1062
1063 /* Reallocate RX ring only if bigger skb buffers are required */
1064 if (rx_skb_size <= dev->rx_skb_size)
1065 goto skip;
1066
1067 /* Second pass, allocate new skbs */
1068 for (i = 0; i < NUM_RX_BUFF; ++i) {
1069 struct sk_buff *skb;
1070
1071 skb = netdev_alloc_skb_ip_align(dev->ndev, rx_skb_size);
1072 if (!skb) {
1073 ret = -ENOMEM;
1074 goto oom;
1075 }
1076
1077 BUG_ON(!dev->rx_skb[i]);
1078 dev_kfree_skb(dev->rx_skb[i]);
1079
1080 dev->rx_desc[i].data_ptr =
1081 dma_map_single(&dev->ofdev->dev, skb->data - NET_IP_ALIGN,
1082 rx_sync_size, DMA_FROM_DEVICE)
1083 + NET_IP_ALIGN;
1084 dev->rx_skb[i] = skb;
1085 }
1086 skip:
1087 /* Check if we need to change "Jumbo" bit in MR1 */
1088 if (emac_has_feature(dev, EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE)) {
1089 mr1_jumbo_bit_change = (new_mtu > ETH_DATA_LEN) ||
1090 (dev->ndev->mtu > ETH_DATA_LEN);
1091 } else {
1092 mr1_jumbo_bit_change = (new_mtu > ETH_DATA_LEN) ^
1093 (dev->ndev->mtu > ETH_DATA_LEN);
1094 }
1095
1096 if (mr1_jumbo_bit_change) {
1097 /* This is to prevent starting RX channel in emac_rx_enable() */
1098 set_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1099
1100 dev->ndev->mtu = new_mtu;
1101 emac_full_tx_reset(dev);
1102 }
1103
1104 mal_set_rcbs(dev->mal, dev->mal_rx_chan, emac_rx_size(new_mtu));
1105 oom:
1106 /* Restart RX */
1107 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1108 dev->rx_slot = 0;
1109 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1110 emac_rx_enable(dev);
1111 emac_netif_start(dev);
1112 mutex_unlock(&dev->link_lock);
1113
1114 return ret;
1115 }
1116
1117 /* Process ctx, rtnl_lock semaphore */
1118 static int emac_change_mtu(struct net_device *ndev, int new_mtu)
1119 {
1120 struct emac_instance *dev = netdev_priv(ndev);
1121 int ret = 0;
1122
1123 DBG(dev, "change_mtu(%d)" NL, new_mtu);
1124
1125 if (netif_running(ndev)) {
1126 /* Check if we really need to reinitialize RX ring */
1127 if (emac_rx_skb_size(ndev->mtu) != emac_rx_skb_size(new_mtu))
1128 ret = emac_resize_rx_ring(dev, new_mtu);
1129 }
1130
1131 if (!ret) {
1132 ndev->mtu = new_mtu;
1133 dev->rx_skb_size = emac_rx_skb_size(new_mtu);
1134 dev->rx_sync_size = emac_rx_sync_size(new_mtu);
1135 }
1136
1137 return ret;
1138 }
1139
1140 static void emac_clean_tx_ring(struct emac_instance *dev)
1141 {
1142 int i;
1143
1144 for (i = 0; i < NUM_TX_BUFF; ++i) {
1145 if (dev->tx_skb[i]) {
1146 dev_kfree_skb(dev->tx_skb[i]);
1147 dev->tx_skb[i] = NULL;
1148 if (dev->tx_desc[i].ctrl & MAL_TX_CTRL_READY)
1149 ++dev->estats.tx_dropped;
1150 }
1151 dev->tx_desc[i].ctrl = 0;
1152 dev->tx_desc[i].data_ptr = 0;
1153 }
1154 }
1155
1156 static void emac_clean_rx_ring(struct emac_instance *dev)
1157 {
1158 int i;
1159
1160 for (i = 0; i < NUM_RX_BUFF; ++i)
1161 if (dev->rx_skb[i]) {
1162 dev->rx_desc[i].ctrl = 0;
1163 dev_kfree_skb(dev->rx_skb[i]);
1164 dev->rx_skb[i] = NULL;
1165 dev->rx_desc[i].data_ptr = 0;
1166 }
1167
1168 if (dev->rx_sg_skb) {
1169 dev_kfree_skb(dev->rx_sg_skb);
1170 dev->rx_sg_skb = NULL;
1171 }
1172 }
1173
1174 static int
1175 __emac_prepare_rx_skb(struct sk_buff *skb, struct emac_instance *dev, int slot)
1176 {
1177 if (unlikely(!skb))
1178 return -ENOMEM;
1179
1180 dev->rx_skb[slot] = skb;
1181 dev->rx_desc[slot].data_len = 0;
1182
1183 dev->rx_desc[slot].data_ptr =
1184 dma_map_single(&dev->ofdev->dev, skb->data - NET_IP_ALIGN,
1185 dev->rx_sync_size, DMA_FROM_DEVICE) + NET_IP_ALIGN;
1186 wmb();
1187 dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
1188 (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1189
1190 return 0;
1191 }
1192
1193 static int
1194 emac_alloc_rx_skb(struct emac_instance *dev, int slot)
1195 {
1196 struct sk_buff *skb;
1197
1198 skb = __netdev_alloc_skb_ip_align(dev->ndev, dev->rx_skb_size,
1199 GFP_KERNEL);
1200
1201 return __emac_prepare_rx_skb(skb, dev, slot);
1202 }
1203
1204 static int
1205 emac_alloc_rx_skb_napi(struct emac_instance *dev, int slot)
1206 {
1207 struct sk_buff *skb;
1208
1209 skb = napi_alloc_skb(&dev->mal->napi, dev->rx_skb_size);
1210
1211 return __emac_prepare_rx_skb(skb, dev, slot);
1212 }
1213
1214 static void emac_print_link_status(struct emac_instance *dev)
1215 {
1216 if (netif_carrier_ok(dev->ndev))
1217 printk(KERN_INFO "%s: link is up, %d %s%s\n",
1218 dev->ndev->name, dev->phy.speed,
1219 dev->phy.duplex == DUPLEX_FULL ? "FDX" : "HDX",
1220 dev->phy.pause ? ", pause enabled" :
1221 dev->phy.asym_pause ? ", asymmetric pause enabled" : "");
1222 else
1223 printk(KERN_INFO "%s: link is down\n", dev->ndev->name);
1224 }
1225
1226 /* Process ctx, rtnl_lock semaphore */
1227 static int emac_open(struct net_device *ndev)
1228 {
1229 struct emac_instance *dev = netdev_priv(ndev);
1230 int err, i;
1231
1232 DBG(dev, "open" NL);
1233
1234 /* Setup error IRQ handler */
1235 err = request_irq(dev->emac_irq, emac_irq, 0, "EMAC", dev);
1236 if (err) {
1237 printk(KERN_ERR "%s: failed to request IRQ %d\n",
1238 ndev->name, dev->emac_irq);
1239 return err;
1240 }
1241
1242 /* Allocate RX ring */
1243 for (i = 0; i < NUM_RX_BUFF; ++i)
1244 if (emac_alloc_rx_skb(dev, i)) {
1245 printk(KERN_ERR "%s: failed to allocate RX ring\n",
1246 ndev->name);
1247 goto oom;
1248 }
1249
1250 dev->tx_cnt = dev->tx_slot = dev->ack_slot = dev->rx_slot = 0;
1251 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1252 dev->rx_sg_skb = NULL;
1253
1254 mutex_lock(&dev->link_lock);
1255 dev->opened = 1;
1256
1257 /* Start PHY polling now.
1258 */
1259 if (dev->phy.address >= 0) {
1260 int link_poll_interval;
1261 if (dev->phy.def->ops->poll_link(&dev->phy)) {
1262 dev->phy.def->ops->read_link(&dev->phy);
1263 emac_rx_clk_default(dev);
1264 netif_carrier_on(dev->ndev);
1265 link_poll_interval = PHY_POLL_LINK_ON;
1266 } else {
1267 emac_rx_clk_tx(dev);
1268 netif_carrier_off(dev->ndev);
1269 link_poll_interval = PHY_POLL_LINK_OFF;
1270 }
1271 dev->link_polling = 1;
1272 wmb();
1273 schedule_delayed_work(&dev->link_work, link_poll_interval);
1274 emac_print_link_status(dev);
1275 } else
1276 netif_carrier_on(dev->ndev);
1277
1278 /* Required for Pause packet support in EMAC */
1279 dev_mc_add_global(ndev, default_mcast_addr);
1280
1281 emac_configure(dev);
1282 mal_poll_add(dev->mal, &dev->commac);
1283 mal_enable_tx_channel(dev->mal, dev->mal_tx_chan);
1284 mal_set_rcbs(dev->mal, dev->mal_rx_chan, emac_rx_size(ndev->mtu));
1285 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1286 emac_tx_enable(dev);
1287 emac_rx_enable(dev);
1288 emac_netif_start(dev);
1289
1290 mutex_unlock(&dev->link_lock);
1291
1292 return 0;
1293 oom:
1294 emac_clean_rx_ring(dev);
1295 free_irq(dev->emac_irq, dev);
1296
1297 return -ENOMEM;
1298 }
1299
1300 /* BHs disabled */
1301 #if 0
1302 static int emac_link_differs(struct emac_instance *dev)
1303 {
1304 u32 r = in_be32(&dev->emacp->mr1);
1305
1306 int duplex = r & EMAC_MR1_FDE ? DUPLEX_FULL : DUPLEX_HALF;
1307 int speed, pause, asym_pause;
1308
1309 if (r & EMAC_MR1_MF_1000)
1310 speed = SPEED_1000;
1311 else if (r & EMAC_MR1_MF_100)
1312 speed = SPEED_100;
1313 else
1314 speed = SPEED_10;
1315
1316 switch (r & (EMAC_MR1_EIFC | EMAC_MR1_APP)) {
1317 case (EMAC_MR1_EIFC | EMAC_MR1_APP):
1318 pause = 1;
1319 asym_pause = 0;
1320 break;
1321 case EMAC_MR1_APP:
1322 pause = 0;
1323 asym_pause = 1;
1324 break;
1325 default:
1326 pause = asym_pause = 0;
1327 }
1328 return speed != dev->phy.speed || duplex != dev->phy.duplex ||
1329 pause != dev->phy.pause || asym_pause != dev->phy.asym_pause;
1330 }
1331 #endif
1332
1333 static void emac_link_timer(struct work_struct *work)
1334 {
1335 struct emac_instance *dev =
1336 container_of(to_delayed_work(work),
1337 struct emac_instance, link_work);
1338 int link_poll_interval;
1339
1340 mutex_lock(&dev->link_lock);
1341 DBG2(dev, "link timer" NL);
1342
1343 if (!dev->opened)
1344 goto bail;
1345
1346 if (dev->phy.def->ops->poll_link(&dev->phy)) {
1347 if (!netif_carrier_ok(dev->ndev)) {
1348 emac_rx_clk_default(dev);
1349 /* Get new link parameters */
1350 dev->phy.def->ops->read_link(&dev->phy);
1351
1352 netif_carrier_on(dev->ndev);
1353 emac_netif_stop(dev);
1354 emac_full_tx_reset(dev);
1355 emac_netif_start(dev);
1356 emac_print_link_status(dev);
1357 }
1358 link_poll_interval = PHY_POLL_LINK_ON;
1359 } else {
1360 if (netif_carrier_ok(dev->ndev)) {
1361 emac_rx_clk_tx(dev);
1362 netif_carrier_off(dev->ndev);
1363 netif_tx_disable(dev->ndev);
1364 emac_reinitialize(dev);
1365 emac_print_link_status(dev);
1366 }
1367 link_poll_interval = PHY_POLL_LINK_OFF;
1368 }
1369 schedule_delayed_work(&dev->link_work, link_poll_interval);
1370 bail:
1371 mutex_unlock(&dev->link_lock);
1372 }
1373
1374 static void emac_force_link_update(struct emac_instance *dev)
1375 {
1376 netif_carrier_off(dev->ndev);
1377 smp_rmb();
1378 if (dev->link_polling) {
1379 cancel_delayed_work_sync(&dev->link_work);
1380 if (dev->link_polling)
1381 schedule_delayed_work(&dev->link_work, PHY_POLL_LINK_OFF);
1382 }
1383 }
1384
1385 /* Process ctx, rtnl_lock semaphore */
1386 static int emac_close(struct net_device *ndev)
1387 {
1388 struct emac_instance *dev = netdev_priv(ndev);
1389
1390 DBG(dev, "close" NL);
1391
1392 if (dev->phy.address >= 0) {
1393 dev->link_polling = 0;
1394 cancel_delayed_work_sync(&dev->link_work);
1395 }
1396 mutex_lock(&dev->link_lock);
1397 emac_netif_stop(dev);
1398 dev->opened = 0;
1399 mutex_unlock(&dev->link_lock);
1400
1401 emac_rx_disable(dev);
1402 emac_tx_disable(dev);
1403 mal_disable_rx_channel(dev->mal, dev->mal_rx_chan);
1404 mal_disable_tx_channel(dev->mal, dev->mal_tx_chan);
1405 mal_poll_del(dev->mal, &dev->commac);
1406
1407 emac_clean_tx_ring(dev);
1408 emac_clean_rx_ring(dev);
1409
1410 free_irq(dev->emac_irq, dev);
1411
1412 netif_carrier_off(ndev);
1413
1414 return 0;
1415 }
1416
1417 static inline u16 emac_tx_csum(struct emac_instance *dev,
1418 struct sk_buff *skb)
1419 {
1420 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH) &&
1421 (skb->ip_summed == CHECKSUM_PARTIAL)) {
1422 ++dev->stats.tx_packets_csum;
1423 return EMAC_TX_CTRL_TAH_CSUM;
1424 }
1425 return 0;
1426 }
1427
1428 static inline netdev_tx_t emac_xmit_finish(struct emac_instance *dev, int len)
1429 {
1430 struct emac_regs __iomem *p = dev->emacp;
1431 struct net_device *ndev = dev->ndev;
1432
1433 /* Send the packet out. If the if makes a significant perf
1434 * difference, then we can store the TMR0 value in "dev"
1435 * instead
1436 */
1437 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
1438 out_be32(&p->tmr0, EMAC4_TMR0_XMIT);
1439 else
1440 out_be32(&p->tmr0, EMAC_TMR0_XMIT);
1441
1442 if (unlikely(++dev->tx_cnt == NUM_TX_BUFF)) {
1443 netif_stop_queue(ndev);
1444 DBG2(dev, "stopped TX queue" NL);
1445 }
1446
1447 netif_trans_update(ndev);
1448 ++dev->stats.tx_packets;
1449 dev->stats.tx_bytes += len;
1450
1451 return NETDEV_TX_OK;
1452 }
1453
1454 /* Tx lock BH */
1455 static netdev_tx_t emac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1456 {
1457 struct emac_instance *dev = netdev_priv(ndev);
1458 unsigned int len = skb->len;
1459 int slot;
1460
1461 u16 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1462 MAL_TX_CTRL_LAST | emac_tx_csum(dev, skb);
1463
1464 slot = dev->tx_slot++;
1465 if (dev->tx_slot == NUM_TX_BUFF) {
1466 dev->tx_slot = 0;
1467 ctrl |= MAL_TX_CTRL_WRAP;
1468 }
1469
1470 DBG2(dev, "xmit(%u) %d" NL, len, slot);
1471
1472 dev->tx_skb[slot] = skb;
1473 dev->tx_desc[slot].data_ptr = dma_map_single(&dev->ofdev->dev,
1474 skb->data, len,
1475 DMA_TO_DEVICE);
1476 dev->tx_desc[slot].data_len = (u16) len;
1477 wmb();
1478 dev->tx_desc[slot].ctrl = ctrl;
1479
1480 return emac_xmit_finish(dev, len);
1481 }
1482
1483 static inline int emac_xmit_split(struct emac_instance *dev, int slot,
1484 u32 pd, int len, int last, u16 base_ctrl)
1485 {
1486 while (1) {
1487 u16 ctrl = base_ctrl;
1488 int chunk = min(len, MAL_MAX_TX_SIZE);
1489 len -= chunk;
1490
1491 slot = (slot + 1) % NUM_TX_BUFF;
1492
1493 if (last && !len)
1494 ctrl |= MAL_TX_CTRL_LAST;
1495 if (slot == NUM_TX_BUFF - 1)
1496 ctrl |= MAL_TX_CTRL_WRAP;
1497
1498 dev->tx_skb[slot] = NULL;
1499 dev->tx_desc[slot].data_ptr = pd;
1500 dev->tx_desc[slot].data_len = (u16) chunk;
1501 dev->tx_desc[slot].ctrl = ctrl;
1502 ++dev->tx_cnt;
1503
1504 if (!len)
1505 break;
1506
1507 pd += chunk;
1508 }
1509 return slot;
1510 }
1511
1512 /* Tx lock BH disabled (SG version for TAH equipped EMACs) */
1513 static netdev_tx_t
1514 emac_start_xmit_sg(struct sk_buff *skb, struct net_device *ndev)
1515 {
1516 struct emac_instance *dev = netdev_priv(ndev);
1517 int nr_frags = skb_shinfo(skb)->nr_frags;
1518 int len = skb->len, chunk;
1519 int slot, i;
1520 u16 ctrl;
1521 u32 pd;
1522
1523 /* This is common "fast" path */
1524 if (likely(!nr_frags && len <= MAL_MAX_TX_SIZE))
1525 return emac_start_xmit(skb, ndev);
1526
1527 len -= skb->data_len;
1528
1529 /* Note, this is only an *estimation*, we can still run out of empty
1530 * slots because of the additional fragmentation into
1531 * MAL_MAX_TX_SIZE-sized chunks
1532 */
1533 if (unlikely(dev->tx_cnt + nr_frags + mal_tx_chunks(len) > NUM_TX_BUFF))
1534 goto stop_queue;
1535
1536 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1537 emac_tx_csum(dev, skb);
1538 slot = dev->tx_slot;
1539
1540 /* skb data */
1541 dev->tx_skb[slot] = NULL;
1542 chunk = min(len, MAL_MAX_TX_SIZE);
1543 dev->tx_desc[slot].data_ptr = pd =
1544 dma_map_single(&dev->ofdev->dev, skb->data, len, DMA_TO_DEVICE);
1545 dev->tx_desc[slot].data_len = (u16) chunk;
1546 len -= chunk;
1547 if (unlikely(len))
1548 slot = emac_xmit_split(dev, slot, pd + chunk, len, !nr_frags,
1549 ctrl);
1550 /* skb fragments */
1551 for (i = 0; i < nr_frags; ++i) {
1552 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1553 len = skb_frag_size(frag);
1554
1555 if (unlikely(dev->tx_cnt + mal_tx_chunks(len) >= NUM_TX_BUFF))
1556 goto undo_frame;
1557
1558 pd = skb_frag_dma_map(&dev->ofdev->dev, frag, 0, len,
1559 DMA_TO_DEVICE);
1560
1561 slot = emac_xmit_split(dev, slot, pd, len, i == nr_frags - 1,
1562 ctrl);
1563 }
1564
1565 DBG2(dev, "xmit_sg(%u) %d - %d" NL, skb->len, dev->tx_slot, slot);
1566
1567 /* Attach skb to the last slot so we don't release it too early */
1568 dev->tx_skb[slot] = skb;
1569
1570 /* Send the packet out */
1571 if (dev->tx_slot == NUM_TX_BUFF - 1)
1572 ctrl |= MAL_TX_CTRL_WRAP;
1573 wmb();
1574 dev->tx_desc[dev->tx_slot].ctrl = ctrl;
1575 dev->tx_slot = (slot + 1) % NUM_TX_BUFF;
1576
1577 return emac_xmit_finish(dev, skb->len);
1578
1579 undo_frame:
1580 /* Well, too bad. Our previous estimation was overly optimistic.
1581 * Undo everything.
1582 */
1583 while (slot != dev->tx_slot) {
1584 dev->tx_desc[slot].ctrl = 0;
1585 --dev->tx_cnt;
1586 if (--slot < 0)
1587 slot = NUM_TX_BUFF - 1;
1588 }
1589 ++dev->estats.tx_undo;
1590
1591 stop_queue:
1592 netif_stop_queue(ndev);
1593 DBG2(dev, "stopped TX queue" NL);
1594 return NETDEV_TX_BUSY;
1595 }
1596
1597 /* Tx lock BHs */
1598 static void emac_parse_tx_error(struct emac_instance *dev, u16 ctrl)
1599 {
1600 struct emac_error_stats *st = &dev->estats;
1601
1602 DBG(dev, "BD TX error %04x" NL, ctrl);
1603
1604 ++st->tx_bd_errors;
1605 if (ctrl & EMAC_TX_ST_BFCS)
1606 ++st->tx_bd_bad_fcs;
1607 if (ctrl & EMAC_TX_ST_LCS)
1608 ++st->tx_bd_carrier_loss;
1609 if (ctrl & EMAC_TX_ST_ED)
1610 ++st->tx_bd_excessive_deferral;
1611 if (ctrl & EMAC_TX_ST_EC)
1612 ++st->tx_bd_excessive_collisions;
1613 if (ctrl & EMAC_TX_ST_LC)
1614 ++st->tx_bd_late_collision;
1615 if (ctrl & EMAC_TX_ST_MC)
1616 ++st->tx_bd_multple_collisions;
1617 if (ctrl & EMAC_TX_ST_SC)
1618 ++st->tx_bd_single_collision;
1619 if (ctrl & EMAC_TX_ST_UR)
1620 ++st->tx_bd_underrun;
1621 if (ctrl & EMAC_TX_ST_SQE)
1622 ++st->tx_bd_sqe;
1623 }
1624
1625 static void emac_poll_tx(void *param)
1626 {
1627 struct emac_instance *dev = param;
1628 u32 bad_mask;
1629
1630 DBG2(dev, "poll_tx, %d %d" NL, dev->tx_cnt, dev->ack_slot);
1631
1632 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
1633 bad_mask = EMAC_IS_BAD_TX_TAH;
1634 else
1635 bad_mask = EMAC_IS_BAD_TX;
1636
1637 netif_tx_lock_bh(dev->ndev);
1638 if (dev->tx_cnt) {
1639 u16 ctrl;
1640 int slot = dev->ack_slot, n = 0;
1641 again:
1642 ctrl = dev->tx_desc[slot].ctrl;
1643 if (!(ctrl & MAL_TX_CTRL_READY)) {
1644 struct sk_buff *skb = dev->tx_skb[slot];
1645 ++n;
1646
1647 if (skb) {
1648 dev_kfree_skb(skb);
1649 dev->tx_skb[slot] = NULL;
1650 }
1651 slot = (slot + 1) % NUM_TX_BUFF;
1652
1653 if (unlikely(ctrl & bad_mask))
1654 emac_parse_tx_error(dev, ctrl);
1655
1656 if (--dev->tx_cnt)
1657 goto again;
1658 }
1659 if (n) {
1660 dev->ack_slot = slot;
1661 if (netif_queue_stopped(dev->ndev) &&
1662 dev->tx_cnt < EMAC_TX_WAKEUP_THRESH)
1663 netif_wake_queue(dev->ndev);
1664
1665 DBG2(dev, "tx %d pkts" NL, n);
1666 }
1667 }
1668 netif_tx_unlock_bh(dev->ndev);
1669 }
1670
1671 static inline void emac_recycle_rx_skb(struct emac_instance *dev, int slot,
1672 int len)
1673 {
1674 struct sk_buff *skb = dev->rx_skb[slot];
1675
1676 DBG2(dev, "recycle %d %d" NL, slot, len);
1677
1678 if (len)
1679 dma_map_single(&dev->ofdev->dev, skb->data - NET_IP_ALIGN,
1680 SKB_DATA_ALIGN(len + NET_IP_ALIGN),
1681 DMA_FROM_DEVICE);
1682
1683 dev->rx_desc[slot].data_len = 0;
1684 wmb();
1685 dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
1686 (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1687 }
1688
1689 static void emac_parse_rx_error(struct emac_instance *dev, u16 ctrl)
1690 {
1691 struct emac_error_stats *st = &dev->estats;
1692
1693 DBG(dev, "BD RX error %04x" NL, ctrl);
1694
1695 ++st->rx_bd_errors;
1696 if (ctrl & EMAC_RX_ST_OE)
1697 ++st->rx_bd_overrun;
1698 if (ctrl & EMAC_RX_ST_BP)
1699 ++st->rx_bd_bad_packet;
1700 if (ctrl & EMAC_RX_ST_RP)
1701 ++st->rx_bd_runt_packet;
1702 if (ctrl & EMAC_RX_ST_SE)
1703 ++st->rx_bd_short_event;
1704 if (ctrl & EMAC_RX_ST_AE)
1705 ++st->rx_bd_alignment_error;
1706 if (ctrl & EMAC_RX_ST_BFCS)
1707 ++st->rx_bd_bad_fcs;
1708 if (ctrl & EMAC_RX_ST_PTL)
1709 ++st->rx_bd_packet_too_long;
1710 if (ctrl & EMAC_RX_ST_ORE)
1711 ++st->rx_bd_out_of_range;
1712 if (ctrl & EMAC_RX_ST_IRE)
1713 ++st->rx_bd_in_range;
1714 }
1715
1716 static inline void emac_rx_csum(struct emac_instance *dev,
1717 struct sk_buff *skb, u16 ctrl)
1718 {
1719 #ifdef CONFIG_IBM_EMAC_TAH
1720 if (!ctrl && dev->tah_dev) {
1721 skb->ip_summed = CHECKSUM_UNNECESSARY;
1722 ++dev->stats.rx_packets_csum;
1723 }
1724 #endif
1725 }
1726
1727 static inline int emac_rx_sg_append(struct emac_instance *dev, int slot)
1728 {
1729 if (likely(dev->rx_sg_skb != NULL)) {
1730 int len = dev->rx_desc[slot].data_len;
1731 int tot_len = dev->rx_sg_skb->len + len;
1732
1733 if (unlikely(tot_len + NET_IP_ALIGN > dev->rx_skb_size)) {
1734 ++dev->estats.rx_dropped_mtu;
1735 dev_kfree_skb(dev->rx_sg_skb);
1736 dev->rx_sg_skb = NULL;
1737 } else {
1738 memcpy(skb_tail_pointer(dev->rx_sg_skb),
1739 dev->rx_skb[slot]->data, len);
1740 skb_put(dev->rx_sg_skb, len);
1741 emac_recycle_rx_skb(dev, slot, len);
1742 return 0;
1743 }
1744 }
1745 emac_recycle_rx_skb(dev, slot, 0);
1746 return -1;
1747 }
1748
1749 /* NAPI poll context */
1750 static int emac_poll_rx(void *param, int budget)
1751 {
1752 struct emac_instance *dev = param;
1753 int slot = dev->rx_slot, received = 0;
1754
1755 DBG2(dev, "poll_rx(%d)" NL, budget);
1756
1757 again:
1758 while (budget > 0) {
1759 int len;
1760 struct sk_buff *skb;
1761 u16 ctrl = dev->rx_desc[slot].ctrl;
1762
1763 if (ctrl & MAL_RX_CTRL_EMPTY)
1764 break;
1765
1766 skb = dev->rx_skb[slot];
1767 mb();
1768 len = dev->rx_desc[slot].data_len;
1769
1770 if (unlikely(!MAL_IS_SINGLE_RX(ctrl)))
1771 goto sg;
1772
1773 ctrl &= EMAC_BAD_RX_MASK;
1774 if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1775 emac_parse_rx_error(dev, ctrl);
1776 ++dev->estats.rx_dropped_error;
1777 emac_recycle_rx_skb(dev, slot, 0);
1778 len = 0;
1779 goto next;
1780 }
1781
1782 if (len < ETH_HLEN) {
1783 ++dev->estats.rx_dropped_stack;
1784 emac_recycle_rx_skb(dev, slot, len);
1785 goto next;
1786 }
1787
1788 if (len && len < EMAC_RX_COPY_THRESH) {
1789 struct sk_buff *copy_skb;
1790
1791 copy_skb = napi_alloc_skb(&dev->mal->napi, len);
1792 if (unlikely(!copy_skb))
1793 goto oom;
1794
1795 memcpy(copy_skb->data - NET_IP_ALIGN,
1796 skb->data - NET_IP_ALIGN,
1797 len + NET_IP_ALIGN);
1798 emac_recycle_rx_skb(dev, slot, len);
1799 skb = copy_skb;
1800 } else if (unlikely(emac_alloc_rx_skb_napi(dev, slot)))
1801 goto oom;
1802
1803 skb_put(skb, len);
1804 push_packet:
1805 skb->protocol = eth_type_trans(skb, dev->ndev);
1806 emac_rx_csum(dev, skb, ctrl);
1807
1808 if (unlikely(netif_receive_skb(skb) == NET_RX_DROP))
1809 ++dev->estats.rx_dropped_stack;
1810 next:
1811 ++dev->stats.rx_packets;
1812 skip:
1813 dev->stats.rx_bytes += len;
1814 slot = (slot + 1) % NUM_RX_BUFF;
1815 --budget;
1816 ++received;
1817 continue;
1818 sg:
1819 if (ctrl & MAL_RX_CTRL_FIRST) {
1820 BUG_ON(dev->rx_sg_skb);
1821 if (unlikely(emac_alloc_rx_skb_napi(dev, slot))) {
1822 DBG(dev, "rx OOM %d" NL, slot);
1823 ++dev->estats.rx_dropped_oom;
1824 emac_recycle_rx_skb(dev, slot, 0);
1825 } else {
1826 dev->rx_sg_skb = skb;
1827 skb_put(skb, len);
1828 }
1829 } else if (!emac_rx_sg_append(dev, slot) &&
1830 (ctrl & MAL_RX_CTRL_LAST)) {
1831
1832 skb = dev->rx_sg_skb;
1833 dev->rx_sg_skb = NULL;
1834
1835 ctrl &= EMAC_BAD_RX_MASK;
1836 if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1837 emac_parse_rx_error(dev, ctrl);
1838 ++dev->estats.rx_dropped_error;
1839 dev_kfree_skb(skb);
1840 len = 0;
1841 } else
1842 goto push_packet;
1843 }
1844 goto skip;
1845 oom:
1846 DBG(dev, "rx OOM %d" NL, slot);
1847 /* Drop the packet and recycle skb */
1848 ++dev->estats.rx_dropped_oom;
1849 emac_recycle_rx_skb(dev, slot, 0);
1850 goto next;
1851 }
1852
1853 if (received) {
1854 DBG2(dev, "rx %d BDs" NL, received);
1855 dev->rx_slot = slot;
1856 }
1857
1858 if (unlikely(budget && test_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags))) {
1859 mb();
1860 if (!(dev->rx_desc[slot].ctrl & MAL_RX_CTRL_EMPTY)) {
1861 DBG2(dev, "rx restart" NL);
1862 received = 0;
1863 goto again;
1864 }
1865
1866 if (dev->rx_sg_skb) {
1867 DBG2(dev, "dropping partial rx packet" NL);
1868 ++dev->estats.rx_dropped_error;
1869 dev_kfree_skb(dev->rx_sg_skb);
1870 dev->rx_sg_skb = NULL;
1871 }
1872
1873 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1874 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1875 emac_rx_enable(dev);
1876 dev->rx_slot = 0;
1877 }
1878 return received;
1879 }
1880
1881 /* NAPI poll context */
1882 static int emac_peek_rx(void *param)
1883 {
1884 struct emac_instance *dev = param;
1885
1886 return !(dev->rx_desc[dev->rx_slot].ctrl & MAL_RX_CTRL_EMPTY);
1887 }
1888
1889 /* NAPI poll context */
1890 static int emac_peek_rx_sg(void *param)
1891 {
1892 struct emac_instance *dev = param;
1893
1894 int slot = dev->rx_slot;
1895 while (1) {
1896 u16 ctrl = dev->rx_desc[slot].ctrl;
1897 if (ctrl & MAL_RX_CTRL_EMPTY)
1898 return 0;
1899 else if (ctrl & MAL_RX_CTRL_LAST)
1900 return 1;
1901
1902 slot = (slot + 1) % NUM_RX_BUFF;
1903
1904 /* I'm just being paranoid here :) */
1905 if (unlikely(slot == dev->rx_slot))
1906 return 0;
1907 }
1908 }
1909
1910 /* Hard IRQ */
1911 static void emac_rxde(void *param)
1912 {
1913 struct emac_instance *dev = param;
1914
1915 ++dev->estats.rx_stopped;
1916 emac_rx_disable_async(dev);
1917 }
1918
1919 /* Hard IRQ */
1920 static irqreturn_t emac_irq(int irq, void *dev_instance)
1921 {
1922 struct emac_instance *dev = dev_instance;
1923 struct emac_regs __iomem *p = dev->emacp;
1924 struct emac_error_stats *st = &dev->estats;
1925 u32 isr;
1926
1927 spin_lock(&dev->lock);
1928
1929 isr = in_be32(&p->isr);
1930 out_be32(&p->isr, isr);
1931
1932 DBG(dev, "isr = %08x" NL, isr);
1933
1934 if (isr & EMAC4_ISR_TXPE)
1935 ++st->tx_parity;
1936 if (isr & EMAC4_ISR_RXPE)
1937 ++st->rx_parity;
1938 if (isr & EMAC4_ISR_TXUE)
1939 ++st->tx_underrun;
1940 if (isr & EMAC4_ISR_RXOE)
1941 ++st->rx_fifo_overrun;
1942 if (isr & EMAC_ISR_OVR)
1943 ++st->rx_overrun;
1944 if (isr & EMAC_ISR_BP)
1945 ++st->rx_bad_packet;
1946 if (isr & EMAC_ISR_RP)
1947 ++st->rx_runt_packet;
1948 if (isr & EMAC_ISR_SE)
1949 ++st->rx_short_event;
1950 if (isr & EMAC_ISR_ALE)
1951 ++st->rx_alignment_error;
1952 if (isr & EMAC_ISR_BFCS)
1953 ++st->rx_bad_fcs;
1954 if (isr & EMAC_ISR_PTLE)
1955 ++st->rx_packet_too_long;
1956 if (isr & EMAC_ISR_ORE)
1957 ++st->rx_out_of_range;
1958 if (isr & EMAC_ISR_IRE)
1959 ++st->rx_in_range;
1960 if (isr & EMAC_ISR_SQE)
1961 ++st->tx_sqe;
1962 if (isr & EMAC_ISR_TE)
1963 ++st->tx_errors;
1964
1965 spin_unlock(&dev->lock);
1966
1967 return IRQ_HANDLED;
1968 }
1969
1970 static struct net_device_stats *emac_stats(struct net_device *ndev)
1971 {
1972 struct emac_instance *dev = netdev_priv(ndev);
1973 struct emac_stats *st = &dev->stats;
1974 struct emac_error_stats *est = &dev->estats;
1975 struct net_device_stats *nst = &ndev->stats;
1976 unsigned long flags;
1977
1978 DBG2(dev, "stats" NL);
1979
1980 /* Compute "legacy" statistics */
1981 spin_lock_irqsave(&dev->lock, flags);
1982 nst->rx_packets = (unsigned long)st->rx_packets;
1983 nst->rx_bytes = (unsigned long)st->rx_bytes;
1984 nst->tx_packets = (unsigned long)st->tx_packets;
1985 nst->tx_bytes = (unsigned long)st->tx_bytes;
1986 nst->rx_dropped = (unsigned long)(est->rx_dropped_oom +
1987 est->rx_dropped_error +
1988 est->rx_dropped_resize +
1989 est->rx_dropped_mtu);
1990 nst->tx_dropped = (unsigned long)est->tx_dropped;
1991
1992 nst->rx_errors = (unsigned long)est->rx_bd_errors;
1993 nst->rx_fifo_errors = (unsigned long)(est->rx_bd_overrun +
1994 est->rx_fifo_overrun +
1995 est->rx_overrun);
1996 nst->rx_frame_errors = (unsigned long)(est->rx_bd_alignment_error +
1997 est->rx_alignment_error);
1998 nst->rx_crc_errors = (unsigned long)(est->rx_bd_bad_fcs +
1999 est->rx_bad_fcs);
2000 nst->rx_length_errors = (unsigned long)(est->rx_bd_runt_packet +
2001 est->rx_bd_short_event +
2002 est->rx_bd_packet_too_long +
2003 est->rx_bd_out_of_range +
2004 est->rx_bd_in_range +
2005 est->rx_runt_packet +
2006 est->rx_short_event +
2007 est->rx_packet_too_long +
2008 est->rx_out_of_range +
2009 est->rx_in_range);
2010
2011 nst->tx_errors = (unsigned long)(est->tx_bd_errors + est->tx_errors);
2012 nst->tx_fifo_errors = (unsigned long)(est->tx_bd_underrun +
2013 est->tx_underrun);
2014 nst->tx_carrier_errors = (unsigned long)est->tx_bd_carrier_loss;
2015 nst->collisions = (unsigned long)(est->tx_bd_excessive_deferral +
2016 est->tx_bd_excessive_collisions +
2017 est->tx_bd_late_collision +
2018 est->tx_bd_multple_collisions);
2019 spin_unlock_irqrestore(&dev->lock, flags);
2020 return nst;
2021 }
2022
2023 static struct mal_commac_ops emac_commac_ops = {
2024 .poll_tx = &emac_poll_tx,
2025 .poll_rx = &emac_poll_rx,
2026 .peek_rx = &emac_peek_rx,
2027 .rxde = &emac_rxde,
2028 };
2029
2030 static struct mal_commac_ops emac_commac_sg_ops = {
2031 .poll_tx = &emac_poll_tx,
2032 .poll_rx = &emac_poll_rx,
2033 .peek_rx = &emac_peek_rx_sg,
2034 .rxde = &emac_rxde,
2035 };
2036
2037 /* Ethtool support */
2038 static int emac_ethtool_get_link_ksettings(struct net_device *ndev,
2039 struct ethtool_link_ksettings *cmd)
2040 {
2041 struct emac_instance *dev = netdev_priv(ndev);
2042 u32 supported, advertising;
2043
2044 supported = dev->phy.features;
2045 cmd->base.port = PORT_MII;
2046 cmd->base.phy_address = dev->phy.address;
2047
2048 mutex_lock(&dev->link_lock);
2049 advertising = dev->phy.advertising;
2050 cmd->base.autoneg = dev->phy.autoneg;
2051 cmd->base.speed = dev->phy.speed;
2052 cmd->base.duplex = dev->phy.duplex;
2053 mutex_unlock(&dev->link_lock);
2054
2055 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
2056 supported);
2057 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
2058 advertising);
2059
2060 return 0;
2061 }
2062
2063 static int
2064 emac_ethtool_set_link_ksettings(struct net_device *ndev,
2065 const struct ethtool_link_ksettings *cmd)
2066 {
2067 struct emac_instance *dev = netdev_priv(ndev);
2068 u32 f = dev->phy.features;
2069 u32 advertising;
2070
2071 ethtool_convert_link_mode_to_legacy_u32(&advertising,
2072 cmd->link_modes.advertising);
2073
2074 DBG(dev, "set_settings(%d, %d, %d, 0x%08x)" NL,
2075 cmd->base.autoneg, cmd->base.speed, cmd->base.duplex, advertising);
2076
2077 /* Basic sanity checks */
2078 if (dev->phy.address < 0)
2079 return -EOPNOTSUPP;
2080 if (cmd->base.autoneg != AUTONEG_ENABLE &&
2081 cmd->base.autoneg != AUTONEG_DISABLE)
2082 return -EINVAL;
2083 if (cmd->base.autoneg == AUTONEG_ENABLE && advertising == 0)
2084 return -EINVAL;
2085 if (cmd->base.duplex != DUPLEX_HALF && cmd->base.duplex != DUPLEX_FULL)
2086 return -EINVAL;
2087
2088 if (cmd->base.autoneg == AUTONEG_DISABLE) {
2089 switch (cmd->base.speed) {
2090 case SPEED_10:
2091 if (cmd->base.duplex == DUPLEX_HALF &&
2092 !(f & SUPPORTED_10baseT_Half))
2093 return -EINVAL;
2094 if (cmd->base.duplex == DUPLEX_FULL &&
2095 !(f & SUPPORTED_10baseT_Full))
2096 return -EINVAL;
2097 break;
2098 case SPEED_100:
2099 if (cmd->base.duplex == DUPLEX_HALF &&
2100 !(f & SUPPORTED_100baseT_Half))
2101 return -EINVAL;
2102 if (cmd->base.duplex == DUPLEX_FULL &&
2103 !(f & SUPPORTED_100baseT_Full))
2104 return -EINVAL;
2105 break;
2106 case SPEED_1000:
2107 if (cmd->base.duplex == DUPLEX_HALF &&
2108 !(f & SUPPORTED_1000baseT_Half))
2109 return -EINVAL;
2110 if (cmd->base.duplex == DUPLEX_FULL &&
2111 !(f & SUPPORTED_1000baseT_Full))
2112 return -EINVAL;
2113 break;
2114 default:
2115 return -EINVAL;
2116 }
2117
2118 mutex_lock(&dev->link_lock);
2119 dev->phy.def->ops->setup_forced(&dev->phy, cmd->base.speed,
2120 cmd->base.duplex);
2121 mutex_unlock(&dev->link_lock);
2122
2123 } else {
2124 if (!(f & SUPPORTED_Autoneg))
2125 return -EINVAL;
2126
2127 mutex_lock(&dev->link_lock);
2128 dev->phy.def->ops->setup_aneg(&dev->phy,
2129 (advertising & f) |
2130 (dev->phy.advertising &
2131 (ADVERTISED_Pause |
2132 ADVERTISED_Asym_Pause)));
2133 mutex_unlock(&dev->link_lock);
2134 }
2135 emac_force_link_update(dev);
2136
2137 return 0;
2138 }
2139
2140 static void emac_ethtool_get_ringparam(struct net_device *ndev,
2141 struct ethtool_ringparam *rp)
2142 {
2143 rp->rx_max_pending = rp->rx_pending = NUM_RX_BUFF;
2144 rp->tx_max_pending = rp->tx_pending = NUM_TX_BUFF;
2145 }
2146
2147 static void emac_ethtool_get_pauseparam(struct net_device *ndev,
2148 struct ethtool_pauseparam *pp)
2149 {
2150 struct emac_instance *dev = netdev_priv(ndev);
2151
2152 mutex_lock(&dev->link_lock);
2153 if ((dev->phy.features & SUPPORTED_Autoneg) &&
2154 (dev->phy.advertising & (ADVERTISED_Pause | ADVERTISED_Asym_Pause)))
2155 pp->autoneg = 1;
2156
2157 if (dev->phy.duplex == DUPLEX_FULL) {
2158 if (dev->phy.pause)
2159 pp->rx_pause = pp->tx_pause = 1;
2160 else if (dev->phy.asym_pause)
2161 pp->tx_pause = 1;
2162 }
2163 mutex_unlock(&dev->link_lock);
2164 }
2165
2166 static int emac_get_regs_len(struct emac_instance *dev)
2167 {
2168 return sizeof(struct emac_ethtool_regs_subhdr) +
2169 sizeof(struct emac_regs);
2170 }
2171
2172 static int emac_ethtool_get_regs_len(struct net_device *ndev)
2173 {
2174 struct emac_instance *dev = netdev_priv(ndev);
2175 int size;
2176
2177 size = sizeof(struct emac_ethtool_regs_hdr) +
2178 emac_get_regs_len(dev) + mal_get_regs_len(dev->mal);
2179 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
2180 size += zmii_get_regs_len(dev->zmii_dev);
2181 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
2182 size += rgmii_get_regs_len(dev->rgmii_dev);
2183 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
2184 size += tah_get_regs_len(dev->tah_dev);
2185
2186 return size;
2187 }
2188
2189 static void *emac_dump_regs(struct emac_instance *dev, void *buf)
2190 {
2191 struct emac_ethtool_regs_subhdr *hdr = buf;
2192
2193 hdr->index = dev->cell_index;
2194 if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {
2195 hdr->version = EMAC4SYNC_ETHTOOL_REGS_VER;
2196 } else if (emac_has_feature(dev, EMAC_FTR_EMAC4)) {
2197 hdr->version = EMAC4_ETHTOOL_REGS_VER;
2198 } else {
2199 hdr->version = EMAC_ETHTOOL_REGS_VER;
2200 }
2201 memcpy_fromio(hdr + 1, dev->emacp, sizeof(struct emac_regs));
2202 return (void *)(hdr + 1) + sizeof(struct emac_regs);
2203 }
2204
2205 static void emac_ethtool_get_regs(struct net_device *ndev,
2206 struct ethtool_regs *regs, void *buf)
2207 {
2208 struct emac_instance *dev = netdev_priv(ndev);
2209 struct emac_ethtool_regs_hdr *hdr = buf;
2210
2211 hdr->components = 0;
2212 buf = hdr + 1;
2213
2214 buf = mal_dump_regs(dev->mal, buf);
2215 buf = emac_dump_regs(dev, buf);
2216 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII)) {
2217 hdr->components |= EMAC_ETHTOOL_REGS_ZMII;
2218 buf = zmii_dump_regs(dev->zmii_dev, buf);
2219 }
2220 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII)) {
2221 hdr->components |= EMAC_ETHTOOL_REGS_RGMII;
2222 buf = rgmii_dump_regs(dev->rgmii_dev, buf);
2223 }
2224 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH)) {
2225 hdr->components |= EMAC_ETHTOOL_REGS_TAH;
2226 buf = tah_dump_regs(dev->tah_dev, buf);
2227 }
2228 }
2229
2230 static int emac_ethtool_nway_reset(struct net_device *ndev)
2231 {
2232 struct emac_instance *dev = netdev_priv(ndev);
2233 int res = 0;
2234
2235 DBG(dev, "nway_reset" NL);
2236
2237 if (dev->phy.address < 0)
2238 return -EOPNOTSUPP;
2239
2240 mutex_lock(&dev->link_lock);
2241 if (!dev->phy.autoneg) {
2242 res = -EINVAL;
2243 goto out;
2244 }
2245
2246 dev->phy.def->ops->setup_aneg(&dev->phy, dev->phy.advertising);
2247 out:
2248 mutex_unlock(&dev->link_lock);
2249 emac_force_link_update(dev);
2250 return res;
2251 }
2252
2253 static int emac_ethtool_get_sset_count(struct net_device *ndev, int stringset)
2254 {
2255 if (stringset == ETH_SS_STATS)
2256 return EMAC_ETHTOOL_STATS_COUNT;
2257 else
2258 return -EINVAL;
2259 }
2260
2261 static void emac_ethtool_get_strings(struct net_device *ndev, u32 stringset,
2262 u8 * buf)
2263 {
2264 if (stringset == ETH_SS_STATS)
2265 memcpy(buf, &emac_stats_keys, sizeof(emac_stats_keys));
2266 }
2267
2268 static void emac_ethtool_get_ethtool_stats(struct net_device *ndev,
2269 struct ethtool_stats *estats,
2270 u64 * tmp_stats)
2271 {
2272 struct emac_instance *dev = netdev_priv(ndev);
2273
2274 memcpy(tmp_stats, &dev->stats, sizeof(dev->stats));
2275 tmp_stats += sizeof(dev->stats) / sizeof(u64);
2276 memcpy(tmp_stats, &dev->estats, sizeof(dev->estats));
2277 }
2278
2279 static void emac_ethtool_get_drvinfo(struct net_device *ndev,
2280 struct ethtool_drvinfo *info)
2281 {
2282 struct emac_instance *dev = netdev_priv(ndev);
2283
2284 strlcpy(info->driver, "ibm_emac", sizeof(info->driver));
2285 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
2286 snprintf(info->bus_info, sizeof(info->bus_info), "PPC 4xx EMAC-%d %pOF",
2287 dev->cell_index, dev->ofdev->dev.of_node);
2288 }
2289
2290 static const struct ethtool_ops emac_ethtool_ops = {
2291 .get_drvinfo = emac_ethtool_get_drvinfo,
2292
2293 .get_regs_len = emac_ethtool_get_regs_len,
2294 .get_regs = emac_ethtool_get_regs,
2295
2296 .nway_reset = emac_ethtool_nway_reset,
2297
2298 .get_ringparam = emac_ethtool_get_ringparam,
2299 .get_pauseparam = emac_ethtool_get_pauseparam,
2300
2301 .get_strings = emac_ethtool_get_strings,
2302 .get_sset_count = emac_ethtool_get_sset_count,
2303 .get_ethtool_stats = emac_ethtool_get_ethtool_stats,
2304
2305 .get_link = ethtool_op_get_link,
2306 .get_link_ksettings = emac_ethtool_get_link_ksettings,
2307 .set_link_ksettings = emac_ethtool_set_link_ksettings,
2308 };
2309
2310 static int emac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
2311 {
2312 struct emac_instance *dev = netdev_priv(ndev);
2313 struct mii_ioctl_data *data = if_mii(rq);
2314
2315 DBG(dev, "ioctl %08x" NL, cmd);
2316
2317 if (dev->phy.address < 0)
2318 return -EOPNOTSUPP;
2319
2320 switch (cmd) {
2321 case SIOCGMIIPHY:
2322 data->phy_id = dev->phy.address;
2323 /* Fall through */
2324 case SIOCGMIIREG:
2325 data->val_out = emac_mdio_read(ndev, dev->phy.address,
2326 data->reg_num);
2327 return 0;
2328
2329 case SIOCSMIIREG:
2330 emac_mdio_write(ndev, dev->phy.address, data->reg_num,
2331 data->val_in);
2332 return 0;
2333 default:
2334 return -EOPNOTSUPP;
2335 }
2336 }
2337
2338 struct emac_depentry {
2339 u32 phandle;
2340 struct device_node *node;
2341 struct platform_device *ofdev;
2342 void *drvdata;
2343 };
2344
2345 #define EMAC_DEP_MAL_IDX 0
2346 #define EMAC_DEP_ZMII_IDX 1
2347 #define EMAC_DEP_RGMII_IDX 2
2348 #define EMAC_DEP_TAH_IDX 3
2349 #define EMAC_DEP_MDIO_IDX 4
2350 #define EMAC_DEP_PREV_IDX 5
2351 #define EMAC_DEP_COUNT 6
2352
2353 static int emac_check_deps(struct emac_instance *dev,
2354 struct emac_depentry *deps)
2355 {
2356 int i, there = 0;
2357 struct device_node *np;
2358
2359 for (i = 0; i < EMAC_DEP_COUNT; i++) {
2360 /* no dependency on that item, allright */
2361 if (deps[i].phandle == 0) {
2362 there++;
2363 continue;
2364 }
2365 /* special case for blist as the dependency might go away */
2366 if (i == EMAC_DEP_PREV_IDX) {
2367 np = *(dev->blist - 1);
2368 if (np == NULL) {
2369 deps[i].phandle = 0;
2370 there++;
2371 continue;
2372 }
2373 if (deps[i].node == NULL)
2374 deps[i].node = of_node_get(np);
2375 }
2376 if (deps[i].node == NULL)
2377 deps[i].node = of_find_node_by_phandle(deps[i].phandle);
2378 if (deps[i].node == NULL)
2379 continue;
2380 if (deps[i].ofdev == NULL)
2381 deps[i].ofdev = of_find_device_by_node(deps[i].node);
2382 if (deps[i].ofdev == NULL)
2383 continue;
2384 if (deps[i].drvdata == NULL)
2385 deps[i].drvdata = platform_get_drvdata(deps[i].ofdev);
2386 if (deps[i].drvdata != NULL)
2387 there++;
2388 }
2389 return there == EMAC_DEP_COUNT;
2390 }
2391
2392 static void emac_put_deps(struct emac_instance *dev)
2393 {
2394 of_dev_put(dev->mal_dev);
2395 of_dev_put(dev->zmii_dev);
2396 of_dev_put(dev->rgmii_dev);
2397 of_dev_put(dev->mdio_dev);
2398 of_dev_put(dev->tah_dev);
2399 }
2400
2401 static int emac_of_bus_notify(struct notifier_block *nb, unsigned long action,
2402 void *data)
2403 {
2404 /* We are only intereted in device addition */
2405 if (action == BUS_NOTIFY_BOUND_DRIVER)
2406 wake_up_all(&emac_probe_wait);
2407 return 0;
2408 }
2409
2410 static struct notifier_block emac_of_bus_notifier = {
2411 .notifier_call = emac_of_bus_notify
2412 };
2413
2414 static int emac_wait_deps(struct emac_instance *dev)
2415 {
2416 struct emac_depentry deps[EMAC_DEP_COUNT];
2417 int i, err;
2418
2419 memset(&deps, 0, sizeof(deps));
2420
2421 deps[EMAC_DEP_MAL_IDX].phandle = dev->mal_ph;
2422 deps[EMAC_DEP_ZMII_IDX].phandle = dev->zmii_ph;
2423 deps[EMAC_DEP_RGMII_IDX].phandle = dev->rgmii_ph;
2424 if (dev->tah_ph)
2425 deps[EMAC_DEP_TAH_IDX].phandle = dev->tah_ph;
2426 if (dev->mdio_ph)
2427 deps[EMAC_DEP_MDIO_IDX].phandle = dev->mdio_ph;
2428 if (dev->blist && dev->blist > emac_boot_list)
2429 deps[EMAC_DEP_PREV_IDX].phandle = 0xffffffffu;
2430 bus_register_notifier(&platform_bus_type, &emac_of_bus_notifier);
2431 wait_event_timeout(emac_probe_wait,
2432 emac_check_deps(dev, deps),
2433 EMAC_PROBE_DEP_TIMEOUT);
2434 bus_unregister_notifier(&platform_bus_type, &emac_of_bus_notifier);
2435 err = emac_check_deps(dev, deps) ? 0 : -ENODEV;
2436 for (i = 0; i < EMAC_DEP_COUNT; i++) {
2437 of_node_put(deps[i].node);
2438 if (err)
2439 of_dev_put(deps[i].ofdev);
2440 }
2441 if (err == 0) {
2442 dev->mal_dev = deps[EMAC_DEP_MAL_IDX].ofdev;
2443 dev->zmii_dev = deps[EMAC_DEP_ZMII_IDX].ofdev;
2444 dev->rgmii_dev = deps[EMAC_DEP_RGMII_IDX].ofdev;
2445 dev->tah_dev = deps[EMAC_DEP_TAH_IDX].ofdev;
2446 dev->mdio_dev = deps[EMAC_DEP_MDIO_IDX].ofdev;
2447 }
2448 of_dev_put(deps[EMAC_DEP_PREV_IDX].ofdev);
2449 return err;
2450 }
2451
2452 static int emac_read_uint_prop(struct device_node *np, const char *name,
2453 u32 *val, int fatal)
2454 {
2455 int len;
2456 const u32 *prop = of_get_property(np, name, &len);
2457 if (prop == NULL || len < sizeof(u32)) {
2458 if (fatal)
2459 printk(KERN_ERR "%pOF: missing %s property\n",
2460 np, name);
2461 return -ENODEV;
2462 }
2463 *val = *prop;
2464 return 0;
2465 }
2466
2467 static void emac_adjust_link(struct net_device *ndev)
2468 {
2469 struct emac_instance *dev = netdev_priv(ndev);
2470 struct phy_device *phy = dev->phy_dev;
2471
2472 dev->phy.autoneg = phy->autoneg;
2473 dev->phy.speed = phy->speed;
2474 dev->phy.duplex = phy->duplex;
2475 dev->phy.pause = phy->pause;
2476 dev->phy.asym_pause = phy->asym_pause;
2477 ethtool_convert_link_mode_to_legacy_u32(&dev->phy.advertising,
2478 phy->advertising);
2479 }
2480
2481 static int emac_mii_bus_read(struct mii_bus *bus, int addr, int regnum)
2482 {
2483 int ret = emac_mdio_read(bus->priv, addr, regnum);
2484 /* This is a workaround for powered down ports/phys.
2485 * In the wild, this was seen on the Cisco Meraki MX60(W).
2486 * This hardware disables ports as part of the handoff
2487 * procedure. Accessing the ports will lead to errors
2488 * (-ETIMEDOUT, -EREMOTEIO) that do more harm than good.
2489 */
2490 return ret < 0 ? 0xffff : ret;
2491 }
2492
2493 static int emac_mii_bus_write(struct mii_bus *bus, int addr,
2494 int regnum, u16 val)
2495 {
2496 emac_mdio_write(bus->priv, addr, regnum, val);
2497 return 0;
2498 }
2499
2500 static int emac_mii_bus_reset(struct mii_bus *bus)
2501 {
2502 struct emac_instance *dev = netdev_priv(bus->priv);
2503
2504 return emac_reset(dev);
2505 }
2506
2507 static int emac_mdio_phy_start_aneg(struct mii_phy *phy,
2508 struct phy_device *phy_dev)
2509 {
2510 phy_dev->autoneg = phy->autoneg;
2511 phy_dev->speed = phy->speed;
2512 phy_dev->duplex = phy->duplex;
2513 ethtool_convert_legacy_u32_to_link_mode(phy_dev->advertising,
2514 phy->advertising);
2515 return phy_start_aneg(phy_dev);
2516 }
2517
2518 static int emac_mdio_setup_aneg(struct mii_phy *phy, u32 advertise)
2519 {
2520 struct net_device *ndev = phy->dev;
2521 struct emac_instance *dev = netdev_priv(ndev);
2522
2523 phy->autoneg = AUTONEG_ENABLE;
2524 phy->advertising = advertise;
2525 return emac_mdio_phy_start_aneg(phy, dev->phy_dev);
2526 }
2527
2528 static int emac_mdio_setup_forced(struct mii_phy *phy, int speed, int fd)
2529 {
2530 struct net_device *ndev = phy->dev;
2531 struct emac_instance *dev = netdev_priv(ndev);
2532
2533 phy->autoneg = AUTONEG_DISABLE;
2534 phy->speed = speed;
2535 phy->duplex = fd;
2536 return emac_mdio_phy_start_aneg(phy, dev->phy_dev);
2537 }
2538
2539 static int emac_mdio_poll_link(struct mii_phy *phy)
2540 {
2541 struct net_device *ndev = phy->dev;
2542 struct emac_instance *dev = netdev_priv(ndev);
2543 int res;
2544
2545 res = phy_read_status(dev->phy_dev);
2546 if (res) {
2547 dev_err(&dev->ofdev->dev, "link update failed (%d).", res);
2548 return ethtool_op_get_link(ndev);
2549 }
2550
2551 return dev->phy_dev->link;
2552 }
2553
2554 static int emac_mdio_read_link(struct mii_phy *phy)
2555 {
2556 struct net_device *ndev = phy->dev;
2557 struct emac_instance *dev = netdev_priv(ndev);
2558 struct phy_device *phy_dev = dev->phy_dev;
2559 int res;
2560
2561 res = phy_read_status(phy_dev);
2562 if (res)
2563 return res;
2564
2565 phy->speed = phy_dev->speed;
2566 phy->duplex = phy_dev->duplex;
2567 phy->pause = phy_dev->pause;
2568 phy->asym_pause = phy_dev->asym_pause;
2569 return 0;
2570 }
2571
2572 static int emac_mdio_init_phy(struct mii_phy *phy)
2573 {
2574 struct net_device *ndev = phy->dev;
2575 struct emac_instance *dev = netdev_priv(ndev);
2576
2577 phy_start(dev->phy_dev);
2578 return phy_init_hw(dev->phy_dev);
2579 }
2580
2581 static const struct mii_phy_ops emac_dt_mdio_phy_ops = {
2582 .init = emac_mdio_init_phy,
2583 .setup_aneg = emac_mdio_setup_aneg,
2584 .setup_forced = emac_mdio_setup_forced,
2585 .poll_link = emac_mdio_poll_link,
2586 .read_link = emac_mdio_read_link,
2587 };
2588
2589 static int emac_dt_mdio_probe(struct emac_instance *dev)
2590 {
2591 struct device_node *mii_np;
2592 int res;
2593
2594 mii_np = of_get_child_by_name(dev->ofdev->dev.of_node, "mdio");
2595 if (!mii_np) {
2596 dev_err(&dev->ofdev->dev, "no mdio definition found.");
2597 return -ENODEV;
2598 }
2599
2600 if (!of_device_is_available(mii_np)) {
2601 res = -ENODEV;
2602 goto put_node;
2603 }
2604
2605 dev->mii_bus = devm_mdiobus_alloc(&dev->ofdev->dev);
2606 if (!dev->mii_bus) {
2607 res = -ENOMEM;
2608 goto put_node;
2609 }
2610
2611 dev->mii_bus->priv = dev->ndev;
2612 dev->mii_bus->parent = dev->ndev->dev.parent;
2613 dev->mii_bus->name = "emac_mdio";
2614 dev->mii_bus->read = &emac_mii_bus_read;
2615 dev->mii_bus->write = &emac_mii_bus_write;
2616 dev->mii_bus->reset = &emac_mii_bus_reset;
2617 snprintf(dev->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev->ofdev->name);
2618 res = of_mdiobus_register(dev->mii_bus, mii_np);
2619 if (res) {
2620 dev_err(&dev->ofdev->dev, "cannot register MDIO bus %s (%d)",
2621 dev->mii_bus->name, res);
2622 }
2623
2624 put_node:
2625 of_node_put(mii_np);
2626 return res;
2627 }
2628
2629 static int emac_dt_phy_connect(struct emac_instance *dev,
2630 struct device_node *phy_handle)
2631 {
2632 dev->phy.def = devm_kzalloc(&dev->ofdev->dev, sizeof(*dev->phy.def),
2633 GFP_KERNEL);
2634 if (!dev->phy.def)
2635 return -ENOMEM;
2636
2637 dev->phy_dev = of_phy_connect(dev->ndev, phy_handle, &emac_adjust_link,
2638 0, dev->phy_mode);
2639 if (!dev->phy_dev) {
2640 dev_err(&dev->ofdev->dev, "failed to connect to PHY.\n");
2641 return -ENODEV;
2642 }
2643
2644 dev->phy.def->phy_id = dev->phy_dev->drv->phy_id;
2645 dev->phy.def->phy_id_mask = dev->phy_dev->drv->phy_id_mask;
2646 dev->phy.def->name = dev->phy_dev->drv->name;
2647 dev->phy.def->ops = &emac_dt_mdio_phy_ops;
2648 ethtool_convert_link_mode_to_legacy_u32(&dev->phy.features,
2649 dev->phy_dev->supported);
2650 dev->phy.address = dev->phy_dev->mdio.addr;
2651 dev->phy.mode = dev->phy_dev->interface;
2652 return 0;
2653 }
2654
2655 static int emac_dt_phy_probe(struct emac_instance *dev)
2656 {
2657 struct device_node *np = dev->ofdev->dev.of_node;
2658 struct device_node *phy_handle;
2659 int res = 1;
2660
2661 phy_handle = of_parse_phandle(np, "phy-handle", 0);
2662
2663 if (phy_handle) {
2664 res = emac_dt_mdio_probe(dev);
2665 if (!res) {
2666 res = emac_dt_phy_connect(dev, phy_handle);
2667 if (res)
2668 mdiobus_unregister(dev->mii_bus);
2669 }
2670 }
2671
2672 of_node_put(phy_handle);
2673 return res;
2674 }
2675
2676 static int emac_init_phy(struct emac_instance *dev)
2677 {
2678 struct device_node *np = dev->ofdev->dev.of_node;
2679 struct net_device *ndev = dev->ndev;
2680 u32 phy_map, adv;
2681 int i;
2682
2683 dev->phy.dev = ndev;
2684 dev->phy.mode = dev->phy_mode;
2685
2686 /* PHY-less configuration. */
2687 if ((dev->phy_address == 0xffffffff && dev->phy_map == 0xffffffff) ||
2688 of_phy_is_fixed_link(np)) {
2689 emac_reset(dev);
2690
2691 /* PHY-less configuration. */
2692 dev->phy.address = -1;
2693 dev->phy.features = SUPPORTED_MII;
2694 if (emac_phy_supports_gige(dev->phy_mode))
2695 dev->phy.features |= SUPPORTED_1000baseT_Full;
2696 else
2697 dev->phy.features |= SUPPORTED_100baseT_Full;
2698 dev->phy.pause = 1;
2699
2700 if (of_phy_is_fixed_link(np)) {
2701 int res = emac_dt_mdio_probe(dev);
2702
2703 if (res)
2704 return res;
2705
2706 res = of_phy_register_fixed_link(np);
2707 dev->phy_dev = of_phy_find_device(np);
2708 if (res || !dev->phy_dev) {
2709 mdiobus_unregister(dev->mii_bus);
2710 return res ? res : -EINVAL;
2711 }
2712 emac_adjust_link(dev->ndev);
2713 put_device(&dev->phy_dev->mdio.dev);
2714 }
2715 return 0;
2716 }
2717
2718 mutex_lock(&emac_phy_map_lock);
2719 phy_map = dev->phy_map | busy_phy_map;
2720
2721 DBG(dev, "PHY maps %08x %08x" NL, dev->phy_map, busy_phy_map);
2722
2723 dev->phy.mdio_read = emac_mdio_read;
2724 dev->phy.mdio_write = emac_mdio_write;
2725
2726 /* Enable internal clock source */
2727 #ifdef CONFIG_PPC_DCR_NATIVE
2728 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2729 dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
2730 #endif
2731 /* PHY clock workaround */
2732 emac_rx_clk_tx(dev);
2733
2734 /* Enable internal clock source on 440GX*/
2735 #ifdef CONFIG_PPC_DCR_NATIVE
2736 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2737 dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
2738 #endif
2739 /* Configure EMAC with defaults so we can at least use MDIO
2740 * This is needed mostly for 440GX
2741 */
2742 if (emac_phy_gpcs(dev->phy.mode)) {
2743 /* XXX
2744 * Make GPCS PHY address equal to EMAC index.
2745 * We probably should take into account busy_phy_map
2746 * and/or phy_map here.
2747 *
2748 * Note that the busy_phy_map is currently global
2749 * while it should probably be per-ASIC...
2750 */
2751 dev->phy.gpcs_address = dev->gpcs_address;
2752 if (dev->phy.gpcs_address == 0xffffffff)
2753 dev->phy.address = dev->cell_index;
2754 }
2755
2756 emac_configure(dev);
2757
2758 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII)) {
2759 int res = emac_dt_phy_probe(dev);
2760
2761 switch (res) {
2762 case 1:
2763 /* No phy-handle property configured.
2764 * Continue with the existing phy probe
2765 * and setup code.
2766 */
2767 break;
2768
2769 case 0:
2770 mutex_unlock(&emac_phy_map_lock);
2771 goto init_phy;
2772
2773 default:
2774 mutex_unlock(&emac_phy_map_lock);
2775 dev_err(&dev->ofdev->dev, "failed to attach dt phy (%d).\n",
2776 res);
2777 return res;
2778 }
2779 }
2780
2781 if (dev->phy_address != 0xffffffff)
2782 phy_map = ~(1 << dev->phy_address);
2783
2784 for (i = 0; i < 0x20; phy_map >>= 1, ++i)
2785 if (!(phy_map & 1)) {
2786 int r;
2787 busy_phy_map |= 1 << i;
2788
2789 /* Quick check if there is a PHY at the address */
2790 r = emac_mdio_read(dev->ndev, i, MII_BMCR);
2791 if (r == 0xffff || r < 0)
2792 continue;
2793 if (!emac_mii_phy_probe(&dev->phy, i))
2794 break;
2795 }
2796
2797 /* Enable external clock source */
2798 #ifdef CONFIG_PPC_DCR_NATIVE
2799 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2800 dcri_clrset(SDR0, SDR0_MFR, SDR0_MFR_ECS, 0);
2801 #endif
2802 mutex_unlock(&emac_phy_map_lock);
2803 if (i == 0x20) {
2804 printk(KERN_WARNING "%pOF: can't find PHY!\n", np);
2805 return -ENXIO;
2806 }
2807
2808 init_phy:
2809 /* Init PHY */
2810 if (dev->phy.def->ops->init)
2811 dev->phy.def->ops->init(&dev->phy);
2812
2813 /* Disable any PHY features not supported by the platform */
2814 dev->phy.def->features &= ~dev->phy_feat_exc;
2815 dev->phy.features &= ~dev->phy_feat_exc;
2816
2817 /* Setup initial link parameters */
2818 if (dev->phy.features & SUPPORTED_Autoneg) {
2819 adv = dev->phy.features;
2820 if (!emac_has_feature(dev, EMAC_FTR_NO_FLOW_CONTROL_40x))
2821 adv |= ADVERTISED_Pause | ADVERTISED_Asym_Pause;
2822 /* Restart autonegotiation */
2823 dev->phy.def->ops->setup_aneg(&dev->phy, adv);
2824 } else {
2825 u32 f = dev->phy.def->features;
2826 int speed = SPEED_10, fd = DUPLEX_HALF;
2827
2828 /* Select highest supported speed/duplex */
2829 if (f & SUPPORTED_1000baseT_Full) {
2830 speed = SPEED_1000;
2831 fd = DUPLEX_FULL;
2832 } else if (f & SUPPORTED_1000baseT_Half)
2833 speed = SPEED_1000;
2834 else if (f & SUPPORTED_100baseT_Full) {
2835 speed = SPEED_100;
2836 fd = DUPLEX_FULL;
2837 } else if (f & SUPPORTED_100baseT_Half)
2838 speed = SPEED_100;
2839 else if (f & SUPPORTED_10baseT_Full)
2840 fd = DUPLEX_FULL;
2841
2842 /* Force link parameters */
2843 dev->phy.def->ops->setup_forced(&dev->phy, speed, fd);
2844 }
2845 return 0;
2846 }
2847
2848 static int emac_init_config(struct emac_instance *dev)
2849 {
2850 struct device_node *np = dev->ofdev->dev.of_node;
2851 const void *p;
2852 int err;
2853
2854 /* Read config from device-tree */
2855 if (emac_read_uint_prop(np, "mal-device", &dev->mal_ph, 1))
2856 return -ENXIO;
2857 if (emac_read_uint_prop(np, "mal-tx-channel", &dev->mal_tx_chan, 1))
2858 return -ENXIO;
2859 if (emac_read_uint_prop(np, "mal-rx-channel", &dev->mal_rx_chan, 1))
2860 return -ENXIO;
2861 if (emac_read_uint_prop(np, "cell-index", &dev->cell_index, 1))
2862 return -ENXIO;
2863 if (emac_read_uint_prop(np, "max-frame-size", &dev->max_mtu, 0))
2864 dev->max_mtu = ETH_DATA_LEN;
2865 if (emac_read_uint_prop(np, "rx-fifo-size", &dev->rx_fifo_size, 0))
2866 dev->rx_fifo_size = 2048;
2867 if (emac_read_uint_prop(np, "tx-fifo-size", &dev->tx_fifo_size, 0))
2868 dev->tx_fifo_size = 2048;
2869 if (emac_read_uint_prop(np, "rx-fifo-size-gige", &dev->rx_fifo_size_gige, 0))
2870 dev->rx_fifo_size_gige = dev->rx_fifo_size;
2871 if (emac_read_uint_prop(np, "tx-fifo-size-gige", &dev->tx_fifo_size_gige, 0))
2872 dev->tx_fifo_size_gige = dev->tx_fifo_size;
2873 if (emac_read_uint_prop(np, "phy-address", &dev->phy_address, 0))
2874 dev->phy_address = 0xffffffff;
2875 if (emac_read_uint_prop(np, "phy-map", &dev->phy_map, 0))
2876 dev->phy_map = 0xffffffff;
2877 if (emac_read_uint_prop(np, "gpcs-address", &dev->gpcs_address, 0))
2878 dev->gpcs_address = 0xffffffff;
2879 if (emac_read_uint_prop(np->parent, "clock-frequency", &dev->opb_bus_freq, 1))
2880 return -ENXIO;
2881 if (emac_read_uint_prop(np, "tah-device", &dev->tah_ph, 0))
2882 dev->tah_ph = 0;
2883 if (emac_read_uint_prop(np, "tah-channel", &dev->tah_port, 0))
2884 dev->tah_port = 0;
2885 if (emac_read_uint_prop(np, "mdio-device", &dev->mdio_ph, 0))
2886 dev->mdio_ph = 0;
2887 if (emac_read_uint_prop(np, "zmii-device", &dev->zmii_ph, 0))
2888 dev->zmii_ph = 0;
2889 if (emac_read_uint_prop(np, "zmii-channel", &dev->zmii_port, 0))
2890 dev->zmii_port = 0xffffffff;
2891 if (emac_read_uint_prop(np, "rgmii-device", &dev->rgmii_ph, 0))
2892 dev->rgmii_ph = 0;
2893 if (emac_read_uint_prop(np, "rgmii-channel", &dev->rgmii_port, 0))
2894 dev->rgmii_port = 0xffffffff;
2895 if (emac_read_uint_prop(np, "fifo-entry-size", &dev->fifo_entry_size, 0))
2896 dev->fifo_entry_size = 16;
2897 if (emac_read_uint_prop(np, "mal-burst-size", &dev->mal_burst_size, 0))
2898 dev->mal_burst_size = 256;
2899
2900 /* PHY mode needs some decoding */
2901 err = of_get_phy_mode(np, &dev->phy_mode);
2902 if (err)
2903 dev->phy_mode = PHY_INTERFACE_MODE_NA;
2904
2905 /* Check EMAC version */
2906 if (of_device_is_compatible(np, "ibm,emac4sync")) {
2907 dev->features |= (EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC);
2908 if (of_device_is_compatible(np, "ibm,emac-460ex") ||
2909 of_device_is_compatible(np, "ibm,emac-460gt"))
2910 dev->features |= EMAC_FTR_460EX_PHY_CLK_FIX;
2911 if (of_device_is_compatible(np, "ibm,emac-405ex") ||
2912 of_device_is_compatible(np, "ibm,emac-405exr"))
2913 dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
2914 if (of_device_is_compatible(np, "ibm,emac-apm821xx")) {
2915 dev->features |= (EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE |
2916 EMAC_FTR_APM821XX_NO_HALF_DUPLEX |
2917 EMAC_FTR_460EX_PHY_CLK_FIX);
2918 }
2919 } else if (of_device_is_compatible(np, "ibm,emac4")) {
2920 dev->features |= EMAC_FTR_EMAC4;
2921 if (of_device_is_compatible(np, "ibm,emac-440gx"))
2922 dev->features |= EMAC_FTR_440GX_PHY_CLK_FIX;
2923 } else {
2924 if (of_device_is_compatible(np, "ibm,emac-440ep") ||
2925 of_device_is_compatible(np, "ibm,emac-440gr"))
2926 dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
2927 if (of_device_is_compatible(np, "ibm,emac-405ez")) {
2928 #ifdef CONFIG_IBM_EMAC_NO_FLOW_CTRL
2929 dev->features |= EMAC_FTR_NO_FLOW_CONTROL_40x;
2930 #else
2931 printk(KERN_ERR "%pOF: Flow control not disabled!\n",
2932 np);
2933 return -ENXIO;
2934 #endif
2935 }
2936
2937 }
2938
2939 /* Fixup some feature bits based on the device tree */
2940 if (of_get_property(np, "has-inverted-stacr-oc", NULL))
2941 dev->features |= EMAC_FTR_STACR_OC_INVERT;
2942 if (of_get_property(np, "has-new-stacr-staopc", NULL))
2943 dev->features |= EMAC_FTR_HAS_NEW_STACR;
2944
2945 /* CAB lacks the appropriate properties */
2946 if (of_device_is_compatible(np, "ibm,emac-axon"))
2947 dev->features |= EMAC_FTR_HAS_NEW_STACR |
2948 EMAC_FTR_STACR_OC_INVERT;
2949
2950 /* Enable TAH/ZMII/RGMII features as found */
2951 if (dev->tah_ph != 0) {
2952 #ifdef CONFIG_IBM_EMAC_TAH
2953 dev->features |= EMAC_FTR_HAS_TAH;
2954 #else
2955 printk(KERN_ERR "%pOF: TAH support not enabled !\n", np);
2956 return -ENXIO;
2957 #endif
2958 }
2959
2960 if (dev->zmii_ph != 0) {
2961 #ifdef CONFIG_IBM_EMAC_ZMII
2962 dev->features |= EMAC_FTR_HAS_ZMII;
2963 #else
2964 printk(KERN_ERR "%pOF: ZMII support not enabled !\n", np);
2965 return -ENXIO;
2966 #endif
2967 }
2968
2969 if (dev->rgmii_ph != 0) {
2970 #ifdef CONFIG_IBM_EMAC_RGMII
2971 dev->features |= EMAC_FTR_HAS_RGMII;
2972 #else
2973 printk(KERN_ERR "%pOF: RGMII support not enabled !\n", np);
2974 return -ENXIO;
2975 #endif
2976 }
2977
2978 /* Read MAC-address */
2979 p = of_get_property(np, "local-mac-address", NULL);
2980 if (p == NULL) {
2981 printk(KERN_ERR "%pOF: Can't find local-mac-address property\n",
2982 np);
2983 return -ENXIO;
2984 }
2985 memcpy(dev->ndev->dev_addr, p, ETH_ALEN);
2986
2987 /* IAHT and GAHT filter parameterization */
2988 if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {
2989 dev->xaht_slots_shift = EMAC4SYNC_XAHT_SLOTS_SHIFT;
2990 dev->xaht_width_shift = EMAC4SYNC_XAHT_WIDTH_SHIFT;
2991 } else {
2992 dev->xaht_slots_shift = EMAC4_XAHT_SLOTS_SHIFT;
2993 dev->xaht_width_shift = EMAC4_XAHT_WIDTH_SHIFT;
2994 }
2995
2996 /* This should never happen */
2997 if (WARN_ON(EMAC_XAHT_REGS(dev) > EMAC_XAHT_MAX_REGS))
2998 return -ENXIO;
2999
3000 DBG(dev, "features : 0x%08x / 0x%08x\n", dev->features, EMAC_FTRS_POSSIBLE);
3001 DBG(dev, "tx_fifo_size : %d (%d gige)\n", dev->tx_fifo_size, dev->tx_fifo_size_gige);
3002 DBG(dev, "rx_fifo_size : %d (%d gige)\n", dev->rx_fifo_size, dev->rx_fifo_size_gige);
3003 DBG(dev, "max_mtu : %d\n", dev->max_mtu);
3004 DBG(dev, "OPB freq : %d\n", dev->opb_bus_freq);
3005
3006 return 0;
3007 }
3008
3009 static const struct net_device_ops emac_netdev_ops = {
3010 .ndo_open = emac_open,
3011 .ndo_stop = emac_close,
3012 .ndo_get_stats = emac_stats,
3013 .ndo_set_rx_mode = emac_set_multicast_list,
3014 .ndo_do_ioctl = emac_ioctl,
3015 .ndo_tx_timeout = emac_tx_timeout,
3016 .ndo_validate_addr = eth_validate_addr,
3017 .ndo_set_mac_address = emac_set_mac_address,
3018 .ndo_start_xmit = emac_start_xmit,
3019 };
3020
3021 static const struct net_device_ops emac_gige_netdev_ops = {
3022 .ndo_open = emac_open,
3023 .ndo_stop = emac_close,
3024 .ndo_get_stats = emac_stats,
3025 .ndo_set_rx_mode = emac_set_multicast_list,
3026 .ndo_do_ioctl = emac_ioctl,
3027 .ndo_tx_timeout = emac_tx_timeout,
3028 .ndo_validate_addr = eth_validate_addr,
3029 .ndo_set_mac_address = emac_set_mac_address,
3030 .ndo_start_xmit = emac_start_xmit_sg,
3031 .ndo_change_mtu = emac_change_mtu,
3032 };
3033
3034 static int emac_probe(struct platform_device *ofdev)
3035 {
3036 struct net_device *ndev;
3037 struct emac_instance *dev;
3038 struct device_node *np = ofdev->dev.of_node;
3039 struct device_node **blist = NULL;
3040 int err, i;
3041
3042 /* Skip unused/unwired EMACS. We leave the check for an unused
3043 * property here for now, but new flat device trees should set a
3044 * status property to "disabled" instead.
3045 */
3046 if (of_get_property(np, "unused", NULL) || !of_device_is_available(np))
3047 return -ENODEV;
3048
3049 /* Find ourselves in the bootlist if we are there */
3050 for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
3051 if (emac_boot_list[i] == np)
3052 blist = &emac_boot_list[i];
3053
3054 /* Allocate our net_device structure */
3055 err = -ENOMEM;
3056 ndev = alloc_etherdev(sizeof(struct emac_instance));
3057 if (!ndev)
3058 goto err_gone;
3059
3060 dev = netdev_priv(ndev);
3061 dev->ndev = ndev;
3062 dev->ofdev = ofdev;
3063 dev->blist = blist;
3064 SET_NETDEV_DEV(ndev, &ofdev->dev);
3065
3066 /* Initialize some embedded data structures */
3067 mutex_init(&dev->mdio_lock);
3068 mutex_init(&dev->link_lock);
3069 spin_lock_init(&dev->lock);
3070 INIT_WORK(&dev->reset_work, emac_reset_work);
3071
3072 /* Init various config data based on device-tree */
3073 err = emac_init_config(dev);
3074 if (err)
3075 goto err_free;
3076
3077 /* Get interrupts. EMAC irq is mandatory, WOL irq is optional */
3078 dev->emac_irq = irq_of_parse_and_map(np, 0);
3079 dev->wol_irq = irq_of_parse_and_map(np, 1);
3080 if (!dev->emac_irq) {
3081 printk(KERN_ERR "%pOF: Can't map main interrupt\n", np);
3082 err = -ENODEV;
3083 goto err_free;
3084 }
3085 ndev->irq = dev->emac_irq;
3086
3087 /* Map EMAC regs */
3088 // TODO : platform_get_resource() and devm_ioremap_resource()
3089 dev->emacp = of_iomap(np, 0);
3090 if (dev->emacp == NULL) {
3091 printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
3092 err = -ENOMEM;
3093 goto err_irq_unmap;
3094 }
3095
3096 /* Wait for dependent devices */
3097 err = emac_wait_deps(dev);
3098 if (err) {
3099 printk(KERN_ERR
3100 "%pOF: Timeout waiting for dependent devices\n", np);
3101 /* display more info about what's missing ? */
3102 goto err_reg_unmap;
3103 }
3104 dev->mal = platform_get_drvdata(dev->mal_dev);
3105 if (dev->mdio_dev != NULL)
3106 dev->mdio_instance = platform_get_drvdata(dev->mdio_dev);
3107
3108 /* Register with MAL */
3109 dev->commac.ops = &emac_commac_ops;
3110 dev->commac.dev = dev;
3111 dev->commac.tx_chan_mask = MAL_CHAN_MASK(dev->mal_tx_chan);
3112 dev->commac.rx_chan_mask = MAL_CHAN_MASK(dev->mal_rx_chan);
3113 err = mal_register_commac(dev->mal, &dev->commac);
3114 if (err) {
3115 printk(KERN_ERR "%pOF: failed to register with mal %pOF!\n",
3116 np, dev->mal_dev->dev.of_node);
3117 goto err_rel_deps;
3118 }
3119 dev->rx_skb_size = emac_rx_skb_size(ndev->mtu);
3120 dev->rx_sync_size = emac_rx_sync_size(ndev->mtu);
3121
3122 /* Get pointers to BD rings */
3123 dev->tx_desc =
3124 dev->mal->bd_virt + mal_tx_bd_offset(dev->mal, dev->mal_tx_chan);
3125 dev->rx_desc =
3126 dev->mal->bd_virt + mal_rx_bd_offset(dev->mal, dev->mal_rx_chan);
3127
3128 DBG(dev, "tx_desc %p" NL, dev->tx_desc);
3129 DBG(dev, "rx_desc %p" NL, dev->rx_desc);
3130
3131 /* Clean rings */
3132 memset(dev->tx_desc, 0, NUM_TX_BUFF * sizeof(struct mal_descriptor));
3133 memset(dev->rx_desc, 0, NUM_RX_BUFF * sizeof(struct mal_descriptor));
3134 memset(dev->tx_skb, 0, NUM_TX_BUFF * sizeof(struct sk_buff *));
3135 memset(dev->rx_skb, 0, NUM_RX_BUFF * sizeof(struct sk_buff *));
3136
3137 /* Attach to ZMII, if needed */
3138 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII) &&
3139 (err = zmii_attach(dev->zmii_dev, dev->zmii_port, &dev->phy_mode)) != 0)
3140 goto err_unreg_commac;
3141
3142 /* Attach to RGMII, if needed */
3143 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII) &&
3144 (err = rgmii_attach(dev->rgmii_dev, dev->rgmii_port, dev->phy_mode)) != 0)
3145 goto err_detach_zmii;
3146
3147 /* Attach to TAH, if needed */
3148 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH) &&
3149 (err = tah_attach(dev->tah_dev, dev->tah_port)) != 0)
3150 goto err_detach_rgmii;
3151
3152 /* Set some link defaults before we can find out real parameters */
3153 dev->phy.speed = SPEED_100;
3154 dev->phy.duplex = DUPLEX_FULL;
3155 dev->phy.autoneg = AUTONEG_DISABLE;
3156 dev->phy.pause = dev->phy.asym_pause = 0;
3157 dev->stop_timeout = STOP_TIMEOUT_100;
3158 INIT_DELAYED_WORK(&dev->link_work, emac_link_timer);
3159
3160 /* Some SoCs like APM821xx does not support Half Duplex mode. */
3161 if (emac_has_feature(dev, EMAC_FTR_APM821XX_NO_HALF_DUPLEX)) {
3162 dev->phy_feat_exc = (SUPPORTED_1000baseT_Half |
3163 SUPPORTED_100baseT_Half |
3164 SUPPORTED_10baseT_Half);
3165 }
3166
3167 /* Find PHY if any */
3168 err = emac_init_phy(dev);
3169 if (err != 0)
3170 goto err_detach_tah;
3171
3172 if (dev->tah_dev) {
3173 ndev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG;
3174 ndev->features |= ndev->hw_features | NETIF_F_RXCSUM;
3175 }
3176 ndev->watchdog_timeo = 5 * HZ;
3177 if (emac_phy_supports_gige(dev->phy_mode)) {
3178 ndev->netdev_ops = &emac_gige_netdev_ops;
3179 dev->commac.ops = &emac_commac_sg_ops;
3180 } else
3181 ndev->netdev_ops = &emac_netdev_ops;
3182 ndev->ethtool_ops = &emac_ethtool_ops;
3183
3184 /* MTU range: 46 - 1500 or whatever is in OF */
3185 ndev->min_mtu = EMAC_MIN_MTU;
3186 ndev->max_mtu = dev->max_mtu;
3187
3188 netif_carrier_off(ndev);
3189
3190 err = register_netdev(ndev);
3191 if (err) {
3192 printk(KERN_ERR "%pOF: failed to register net device (%d)!\n",
3193 np, err);
3194 goto err_detach_tah;
3195 }
3196
3197 /* Set our drvdata last as we don't want them visible until we are
3198 * fully initialized
3199 */
3200 wmb();
3201 platform_set_drvdata(ofdev, dev);
3202
3203 /* There's a new kid in town ! Let's tell everybody */
3204 wake_up_all(&emac_probe_wait);
3205
3206
3207 printk(KERN_INFO "%s: EMAC-%d %pOF, MAC %pM\n",
3208 ndev->name, dev->cell_index, np, ndev->dev_addr);
3209
3210 if (dev->phy_mode == PHY_INTERFACE_MODE_SGMII)
3211 printk(KERN_NOTICE "%s: in SGMII mode\n", ndev->name);
3212
3213 if (dev->phy.address >= 0)
3214 printk("%s: found %s PHY (0x%02x)\n", ndev->name,
3215 dev->phy.def->name, dev->phy.address);
3216
3217 /* Life is good */
3218 return 0;
3219
3220 /* I have a bad feeling about this ... */
3221
3222 err_detach_tah:
3223 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
3224 tah_detach(dev->tah_dev, dev->tah_port);
3225 err_detach_rgmii:
3226 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
3227 rgmii_detach(dev->rgmii_dev, dev->rgmii_port);
3228 err_detach_zmii:
3229 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
3230 zmii_detach(dev->zmii_dev, dev->zmii_port);
3231 err_unreg_commac:
3232 mal_unregister_commac(dev->mal, &dev->commac);
3233 err_rel_deps:
3234 emac_put_deps(dev);
3235 err_reg_unmap:
3236 iounmap(dev->emacp);
3237 err_irq_unmap:
3238 if (dev->wol_irq)
3239 irq_dispose_mapping(dev->wol_irq);
3240 if (dev->emac_irq)
3241 irq_dispose_mapping(dev->emac_irq);
3242 err_free:
3243 free_netdev(ndev);
3244 err_gone:
3245 /* if we were on the bootlist, remove us as we won't show up and
3246 * wake up all waiters to notify them in case they were waiting
3247 * on us
3248 */
3249 if (blist) {
3250 *blist = NULL;
3251 wake_up_all(&emac_probe_wait);
3252 }
3253 return err;
3254 }
3255
3256 static int emac_remove(struct platform_device *ofdev)
3257 {
3258 struct emac_instance *dev = platform_get_drvdata(ofdev);
3259
3260 DBG(dev, "remove" NL);
3261
3262 unregister_netdev(dev->ndev);
3263
3264 cancel_work_sync(&dev->reset_work);
3265
3266 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
3267 tah_detach(dev->tah_dev, dev->tah_port);
3268 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
3269 rgmii_detach(dev->rgmii_dev, dev->rgmii_port);
3270 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
3271 zmii_detach(dev->zmii_dev, dev->zmii_port);
3272
3273 if (dev->phy_dev)
3274 phy_disconnect(dev->phy_dev);
3275
3276 if (dev->mii_bus)
3277 mdiobus_unregister(dev->mii_bus);
3278
3279 busy_phy_map &= ~(1 << dev->phy.address);
3280 DBG(dev, "busy_phy_map now %#x" NL, busy_phy_map);
3281
3282 mal_unregister_commac(dev->mal, &dev->commac);
3283 emac_put_deps(dev);
3284
3285 iounmap(dev->emacp);
3286
3287 if (dev->wol_irq)
3288 irq_dispose_mapping(dev->wol_irq);
3289 if (dev->emac_irq)
3290 irq_dispose_mapping(dev->emac_irq);
3291
3292 free_netdev(dev->ndev);
3293
3294 return 0;
3295 }
3296
3297 /* XXX Features in here should be replaced by properties... */
3298 static const struct of_device_id emac_match[] =
3299 {
3300 {
3301 .type = "network",
3302 .compatible = "ibm,emac",
3303 },
3304 {
3305 .type = "network",
3306 .compatible = "ibm,emac4",
3307 },
3308 {
3309 .type = "network",
3310 .compatible = "ibm,emac4sync",
3311 },
3312 {},
3313 };
3314 MODULE_DEVICE_TABLE(of, emac_match);
3315
3316 static struct platform_driver emac_driver = {
3317 .driver = {
3318 .name = "emac",
3319 .of_match_table = emac_match,
3320 },
3321 .probe = emac_probe,
3322 .remove = emac_remove,
3323 };
3324
3325 static void __init emac_make_bootlist(void)
3326 {
3327 struct device_node *np = NULL;
3328 int j, max, i = 0;
3329 int cell_indices[EMAC_BOOT_LIST_SIZE];
3330
3331 /* Collect EMACs */
3332 while((np = of_find_all_nodes(np)) != NULL) {
3333 const u32 *idx;
3334
3335 if (of_match_node(emac_match, np) == NULL)
3336 continue;
3337 if (of_get_property(np, "unused", NULL))
3338 continue;
3339 idx = of_get_property(np, "cell-index", NULL);
3340 if (idx == NULL)
3341 continue;
3342 cell_indices[i] = *idx;
3343 emac_boot_list[i++] = of_node_get(np);
3344 if (i >= EMAC_BOOT_LIST_SIZE) {
3345 of_node_put(np);
3346 break;
3347 }
3348 }
3349 max = i;
3350
3351 /* Bubble sort them (doh, what a creative algorithm :-) */
3352 for (i = 0; max > 1 && (i < (max - 1)); i++)
3353 for (j = i; j < max; j++) {
3354 if (cell_indices[i] > cell_indices[j]) {
3355 swap(emac_boot_list[i], emac_boot_list[j]);
3356 swap(cell_indices[i], cell_indices[j]);
3357 }
3358 }
3359 }
3360
3361 static int __init emac_init(void)
3362 {
3363 int rc;
3364
3365 printk(KERN_INFO DRV_DESC ", version " DRV_VERSION "\n");
3366
3367 /* Build EMAC boot list */
3368 emac_make_bootlist();
3369
3370 /* Init submodules */
3371 rc = mal_init();
3372 if (rc)
3373 goto err;
3374 rc = zmii_init();
3375 if (rc)
3376 goto err_mal;
3377 rc = rgmii_init();
3378 if (rc)
3379 goto err_zmii;
3380 rc = tah_init();
3381 if (rc)
3382 goto err_rgmii;
3383 rc = platform_driver_register(&emac_driver);
3384 if (rc)
3385 goto err_tah;
3386
3387 return 0;
3388
3389 err_tah:
3390 tah_exit();
3391 err_rgmii:
3392 rgmii_exit();
3393 err_zmii:
3394 zmii_exit();
3395 err_mal:
3396 mal_exit();
3397 err:
3398 return rc;
3399 }
3400
3401 static void __exit emac_exit(void)
3402 {
3403 int i;
3404
3405 platform_driver_unregister(&emac_driver);
3406
3407 tah_exit();
3408 rgmii_exit();
3409 zmii_exit();
3410 mal_exit();
3411
3412 /* Destroy EMAC boot list */
3413 for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
3414 of_node_put(emac_boot_list[i]);
3415 }
3416
3417 module_init(emac_init);
3418 module_exit(emac_exit);
Linux with added FPC-III support