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WIP FPC-III support
[linux/fpc-iii.git] / drivers / net / ethernet / ibm / emac / core.c
blobc00b9097eeea413755ead5d1f6e0949be72abe21
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;
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 bail:
923 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
924 rgmii_put_mdio(dev->rgmii_dev, dev->rgmii_port);
925 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
926 zmii_put_mdio(dev->zmii_dev, dev->zmii_port);
927 mutex_unlock(&dev->mdio_lock);
928 }
929
930 static int emac_mdio_read(struct net_device *ndev, int id, int reg)
931 {
932 struct emac_instance *dev = netdev_priv(ndev);
933 int res;
934
935 res = __emac_mdio_read((dev->mdio_instance &&
936 dev->phy.gpcs_address != id) ?
937 dev->mdio_instance : dev,
938 (u8) id, (u8) reg);
939 return res;
940 }
941
942 static void emac_mdio_write(struct net_device *ndev, int id, int reg, int val)
943 {
944 struct emac_instance *dev = netdev_priv(ndev);
945
946 __emac_mdio_write((dev->mdio_instance &&
947 dev->phy.gpcs_address != id) ?
948 dev->mdio_instance : dev,
949 (u8) id, (u8) reg, (u16) val);
950 }
951
952 /* Tx lock BH */
953 static void __emac_set_multicast_list(struct emac_instance *dev)
954 {
955 struct emac_regs __iomem *p = dev->emacp;
956 u32 rmr = emac_iff2rmr(dev->ndev);
957
958 DBG(dev, "__multicast %08x" NL, rmr);
959
960 /* I decided to relax register access rules here to avoid
961 * full EMAC reset.
962 *
963 * There is a real problem with EMAC4 core if we use MWSW_001 bit
964 * in MR1 register and do a full EMAC reset.
965 * One TX BD status update is delayed and, after EMAC reset, it
966 * never happens, resulting in TX hung (it'll be recovered by TX
967 * timeout handler eventually, but this is just gross).
968 * So we either have to do full TX reset or try to cheat here :)
969 *
970 * The only required change is to RX mode register, so I *think* all
971 * we need is just to stop RX channel. This seems to work on all
972 * tested SoCs. --ebs
973 *
974 * If we need the full reset, we might just trigger the workqueue
975 * and do it async... a bit nasty but should work --BenH
976 */
977 dev->mcast_pending = 0;
978 emac_rx_disable(dev);
979 if (rmr & EMAC_RMR_MAE)
980 emac_hash_mc(dev);
981 out_be32(&p->rmr, rmr);
982 emac_rx_enable(dev);
983 }
984
985 /* Tx lock BH */
986 static void emac_set_multicast_list(struct net_device *ndev)
987 {
988 struct emac_instance *dev = netdev_priv(ndev);
989
990 DBG(dev, "multicast" NL);
991
992 BUG_ON(!netif_running(dev->ndev));
993
994 if (dev->no_mcast) {
995 dev->mcast_pending = 1;
996 return;
997 }
998
999 mutex_lock(&dev->link_lock);
1000 __emac_set_multicast_list(dev);
1001 mutex_unlock(&dev->link_lock);
1002 }
1003
1004 static int emac_set_mac_address(struct net_device *ndev, void *sa)
1005 {
1006 struct emac_instance *dev = netdev_priv(ndev);
1007 struct sockaddr *addr = sa;
1008 struct emac_regs __iomem *p = dev->emacp;
1009
1010 if (!is_valid_ether_addr(addr->sa_data))
1011 return -EADDRNOTAVAIL;
1012
1013 mutex_lock(&dev->link_lock);
1014
1015 memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
1016
1017 emac_rx_disable(dev);
1018 emac_tx_disable(dev);
1019 out_be32(&p->iahr, (ndev->dev_addr[0] << 8) | ndev->dev_addr[1]);
1020 out_be32(&p->ialr, (ndev->dev_addr[2] << 24) |
1021 (ndev->dev_addr[3] << 16) | (ndev->dev_addr[4] << 8) |
1022 ndev->dev_addr[5]);
1023 emac_tx_enable(dev);
1024 emac_rx_enable(dev);
1025
1026 mutex_unlock(&dev->link_lock);
1027
1028 return 0;
1029 }
1030
1031 static int emac_resize_rx_ring(struct emac_instance *dev, int new_mtu)
1032 {
1033 int rx_sync_size = emac_rx_sync_size(new_mtu);
1034 int rx_skb_size = emac_rx_skb_size(new_mtu);
1035 int i, ret = 0;
1036 int mr1_jumbo_bit_change = 0;
1037
1038 mutex_lock(&dev->link_lock);
1039 emac_netif_stop(dev);
1040 emac_rx_disable(dev);
1041 mal_disable_rx_channel(dev->mal, dev->mal_rx_chan);
1042
1043 if (dev->rx_sg_skb) {
1044 ++dev->estats.rx_dropped_resize;
1045 dev_kfree_skb(dev->rx_sg_skb);
1046 dev->rx_sg_skb = NULL;
1047 }
1048
1049 /* Make a first pass over RX ring and mark BDs ready, dropping
1050 * non-processed packets on the way. We need this as a separate pass
1051 * to simplify error recovery in the case of allocation failure later.
1052 */
1053 for (i = 0; i < NUM_RX_BUFF; ++i) {
1054 if (dev->rx_desc[i].ctrl & MAL_RX_CTRL_FIRST)
1055 ++dev->estats.rx_dropped_resize;
1056
1057 dev->rx_desc[i].data_len = 0;
1058 dev->rx_desc[i].ctrl = MAL_RX_CTRL_EMPTY |
1059 (i == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1060 }
1061
1062 /* Reallocate RX ring only if bigger skb buffers are required */
1063 if (rx_skb_size <= dev->rx_skb_size)
1064 goto skip;
1065
1066 /* Second pass, allocate new skbs */
1067 for (i = 0; i < NUM_RX_BUFF; ++i) {
1068 struct sk_buff *skb;
1069
1070 skb = netdev_alloc_skb_ip_align(dev->ndev, rx_skb_size);
1071 if (!skb) {
1072 ret = -ENOMEM;
1073 goto oom;
1074 }
1075
1076 BUG_ON(!dev->rx_skb[i]);
1077 dev_kfree_skb(dev->rx_skb[i]);
1078
1079 dev->rx_desc[i].data_ptr =
1080 dma_map_single(&dev->ofdev->dev, skb->data - NET_IP_ALIGN,
1081 rx_sync_size, DMA_FROM_DEVICE)
1082 + NET_IP_ALIGN;
1083 dev->rx_skb[i] = skb;
1084 }
1085 skip:
1086 /* Check if we need to change "Jumbo" bit in MR1 */
1087 if (emac_has_feature(dev, EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE)) {
1088 mr1_jumbo_bit_change = (new_mtu > ETH_DATA_LEN) ||
1089 (dev->ndev->mtu > ETH_DATA_LEN);
1090 } else {
1091 mr1_jumbo_bit_change = (new_mtu > ETH_DATA_LEN) ^
1092 (dev->ndev->mtu > ETH_DATA_LEN);
1093 }
1094
1095 if (mr1_jumbo_bit_change) {
1096 /* This is to prevent starting RX channel in emac_rx_enable() */
1097 set_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1098
1099 dev->ndev->mtu = new_mtu;
1100 emac_full_tx_reset(dev);
1101 }
1102
1103 mal_set_rcbs(dev->mal, dev->mal_rx_chan, emac_rx_size(new_mtu));
1104 oom:
1105 /* Restart RX */
1106 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1107 dev->rx_slot = 0;
1108 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1109 emac_rx_enable(dev);
1110 emac_netif_start(dev);
1111 mutex_unlock(&dev->link_lock);
1112
1113 return ret;
1114 }
1115
1116 /* Process ctx, rtnl_lock semaphore */
1117 static int emac_change_mtu(struct net_device *ndev, int new_mtu)
1118 {
1119 struct emac_instance *dev = netdev_priv(ndev);
1120 int ret = 0;
1121
1122 DBG(dev, "change_mtu(%d)" NL, new_mtu);
1123
1124 if (netif_running(ndev)) {
1125 /* Check if we really need to reinitialize RX ring */
1126 if (emac_rx_skb_size(ndev->mtu) != emac_rx_skb_size(new_mtu))
1127 ret = emac_resize_rx_ring(dev, new_mtu);
1128 }
1129
1130 if (!ret) {
1131 ndev->mtu = new_mtu;
1132 dev->rx_skb_size = emac_rx_skb_size(new_mtu);
1133 dev->rx_sync_size = emac_rx_sync_size(new_mtu);
1134 }
1135
1136 return ret;
1137 }
1138
1139 static void emac_clean_tx_ring(struct emac_instance *dev)
1140 {
1141 int i;
1142
1143 for (i = 0; i < NUM_TX_BUFF; ++i) {
1144 if (dev->tx_skb[i]) {
1145 dev_kfree_skb(dev->tx_skb[i]);
1146 dev->tx_skb[i] = NULL;
1147 if (dev->tx_desc[i].ctrl & MAL_TX_CTRL_READY)
1148 ++dev->estats.tx_dropped;
1149 }
1150 dev->tx_desc[i].ctrl = 0;
1151 dev->tx_desc[i].data_ptr = 0;
1152 }
1153 }
1154
1155 static void emac_clean_rx_ring(struct emac_instance *dev)
1156 {
1157 int i;
1158
1159 for (i = 0; i < NUM_RX_BUFF; ++i)
1160 if (dev->rx_skb[i]) {
1161 dev->rx_desc[i].ctrl = 0;
1162 dev_kfree_skb(dev->rx_skb[i]);
1163 dev->rx_skb[i] = NULL;
1164 dev->rx_desc[i].data_ptr = 0;
1165 }
1166
1167 if (dev->rx_sg_skb) {
1168 dev_kfree_skb(dev->rx_sg_skb);
1169 dev->rx_sg_skb = NULL;
1170 }
1171 }
1172
1173 static int
1174 __emac_prepare_rx_skb(struct sk_buff *skb, struct emac_instance *dev, int slot)
1175 {
1176 if (unlikely(!skb))
1177 return -ENOMEM;
1178
1179 dev->rx_skb[slot] = skb;
1180 dev->rx_desc[slot].data_len = 0;
1181
1182 dev->rx_desc[slot].data_ptr =
1183 dma_map_single(&dev->ofdev->dev, skb->data - NET_IP_ALIGN,
1184 dev->rx_sync_size, DMA_FROM_DEVICE) + NET_IP_ALIGN;
1185 wmb();
1186 dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
1187 (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1188
1189 return 0;
1190 }
1191
1192 static int
1193 emac_alloc_rx_skb(struct emac_instance *dev, int slot)
1194 {
1195 struct sk_buff *skb;
1196
1197 skb = __netdev_alloc_skb_ip_align(dev->ndev, dev->rx_skb_size,
1198 GFP_KERNEL);
1199
1200 return __emac_prepare_rx_skb(skb, dev, slot);
1201 }
1202
1203 static int
1204 emac_alloc_rx_skb_napi(struct emac_instance *dev, int slot)
1205 {
1206 struct sk_buff *skb;
1207
1208 skb = napi_alloc_skb(&dev->mal->napi, dev->rx_skb_size);
1209
1210 return __emac_prepare_rx_skb(skb, dev, slot);
1211 }
1212
1213 static void emac_print_link_status(struct emac_instance *dev)
1214 {
1215 if (netif_carrier_ok(dev->ndev))
1216 printk(KERN_INFO "%s: link is up, %d %s%s\n",
1217 dev->ndev->name, dev->phy.speed,
1218 dev->phy.duplex == DUPLEX_FULL ? "FDX" : "HDX",
1219 dev->phy.pause ? ", pause enabled" :
1220 dev->phy.asym_pause ? ", asymmetric pause enabled" : "");
1221 else
1222 printk(KERN_INFO "%s: link is down\n", dev->ndev->name);
1223 }
1224
1225 /* Process ctx, rtnl_lock semaphore */
1226 static int emac_open(struct net_device *ndev)
1227 {
1228 struct emac_instance *dev = netdev_priv(ndev);
1229 int err, i;
1230
1231 DBG(dev, "open" NL);
1232
1233 /* Setup error IRQ handler */
1234 err = request_irq(dev->emac_irq, emac_irq, 0, "EMAC", dev);
1235 if (err) {
1236 printk(KERN_ERR "%s: failed to request IRQ %d\n",
1237 ndev->name, dev->emac_irq);
1238 return err;
1239 }
1240
1241 /* Allocate RX ring */
1242 for (i = 0; i < NUM_RX_BUFF; ++i)
1243 if (emac_alloc_rx_skb(dev, i)) {
1244 printk(KERN_ERR "%s: failed to allocate RX ring\n",
1245 ndev->name);
1246 goto oom;
1247 }
1248
1249 dev->tx_cnt = dev->tx_slot = dev->ack_slot = dev->rx_slot = 0;
1250 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1251 dev->rx_sg_skb = NULL;
1252
1253 mutex_lock(&dev->link_lock);
1254 dev->opened = 1;
1255
1256 /* Start PHY polling now.
1257 */
1258 if (dev->phy.address >= 0) {
1259 int link_poll_interval;
1260 if (dev->phy.def->ops->poll_link(&dev->phy)) {
1261 dev->phy.def->ops->read_link(&dev->phy);
1262 emac_rx_clk_default(dev);
1263 netif_carrier_on(dev->ndev);
1264 link_poll_interval = PHY_POLL_LINK_ON;
1265 } else {
1266 emac_rx_clk_tx(dev);
1267 netif_carrier_off(dev->ndev);
1268 link_poll_interval = PHY_POLL_LINK_OFF;
1269 }
1270 dev->link_polling = 1;
1271 wmb();
1272 schedule_delayed_work(&dev->link_work, link_poll_interval);
1273 emac_print_link_status(dev);
1274 } else
1275 netif_carrier_on(dev->ndev);
1276
1277 /* Required for Pause packet support in EMAC */
1278 dev_mc_add_global(ndev, default_mcast_addr);
1279
1280 emac_configure(dev);
1281 mal_poll_add(dev->mal, &dev->commac);
1282 mal_enable_tx_channel(dev->mal, dev->mal_tx_chan);
1283 mal_set_rcbs(dev->mal, dev->mal_rx_chan, emac_rx_size(ndev->mtu));
1284 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1285 emac_tx_enable(dev);
1286 emac_rx_enable(dev);
1287 emac_netif_start(dev);
1288
1289 mutex_unlock(&dev->link_lock);
1290
1291 return 0;
1292 oom:
1293 emac_clean_rx_ring(dev);
1294 free_irq(dev->emac_irq, dev);
1295
1296 return -ENOMEM;
1297 }
1298
1299 /* BHs disabled */
1300 #if 0
1301 static int emac_link_differs(struct emac_instance *dev)
1302 {
1303 u32 r = in_be32(&dev->emacp->mr1);
1304
1305 int duplex = r & EMAC_MR1_FDE ? DUPLEX_FULL : DUPLEX_HALF;
1306 int speed, pause, asym_pause;
1307
1308 if (r & EMAC_MR1_MF_1000)
1309 speed = SPEED_1000;
1310 else if (r & EMAC_MR1_MF_100)
1311 speed = SPEED_100;
1312 else
1313 speed = SPEED_10;
1314
1315 switch (r & (EMAC_MR1_EIFC | EMAC_MR1_APP)) {
1316 case (EMAC_MR1_EIFC | EMAC_MR1_APP):
1317 pause = 1;
1318 asym_pause = 0;
1319 break;
1320 case EMAC_MR1_APP:
1321 pause = 0;
1322 asym_pause = 1;
1323 break;
1324 default:
1325 pause = asym_pause = 0;
1326 }
1327 return speed != dev->phy.speed || duplex != dev->phy.duplex ||
1328 pause != dev->phy.pause || asym_pause != dev->phy.asym_pause;
1329 }
1330 #endif
1331
1332 static void emac_link_timer(struct work_struct *work)
1333 {
1334 struct emac_instance *dev =
1335 container_of(to_delayed_work(work),
1336 struct emac_instance, link_work);
1337 int link_poll_interval;
1338
1339 mutex_lock(&dev->link_lock);
1340 DBG2(dev, "link timer" NL);
1341
1342 if (!dev->opened)
1343 goto bail;
1344
1345 if (dev->phy.def->ops->poll_link(&dev->phy)) {
1346 if (!netif_carrier_ok(dev->ndev)) {
1347 emac_rx_clk_default(dev);
1348 /* Get new link parameters */
1349 dev->phy.def->ops->read_link(&dev->phy);
1350
1351 netif_carrier_on(dev->ndev);
1352 emac_netif_stop(dev);
1353 emac_full_tx_reset(dev);
1354 emac_netif_start(dev);
1355 emac_print_link_status(dev);
1356 }
1357 link_poll_interval = PHY_POLL_LINK_ON;
1358 } else {
1359 if (netif_carrier_ok(dev->ndev)) {
1360 emac_rx_clk_tx(dev);
1361 netif_carrier_off(dev->ndev);
1362 netif_tx_disable(dev->ndev);
1363 emac_reinitialize(dev);
1364 emac_print_link_status(dev);
1365 }
1366 link_poll_interval = PHY_POLL_LINK_OFF;
1367 }
1368 schedule_delayed_work(&dev->link_work, link_poll_interval);
1369 bail:
1370 mutex_unlock(&dev->link_lock);
1371 }
1372
1373 static void emac_force_link_update(struct emac_instance *dev)
1374 {
1375 netif_carrier_off(dev->ndev);
1376 smp_rmb();
1377 if (dev->link_polling) {
1378 cancel_delayed_work_sync(&dev->link_work);
1379 if (dev->link_polling)
1380 schedule_delayed_work(&dev->link_work, PHY_POLL_LINK_OFF);
1381 }
1382 }
1383
1384 /* Process ctx, rtnl_lock semaphore */
1385 static int emac_close(struct net_device *ndev)
1386 {
1387 struct emac_instance *dev = netdev_priv(ndev);
1388
1389 DBG(dev, "close" NL);
1390
1391 if (dev->phy.address >= 0) {
1392 dev->link_polling = 0;
1393 cancel_delayed_work_sync(&dev->link_work);
1394 }
1395 mutex_lock(&dev->link_lock);
1396 emac_netif_stop(dev);
1397 dev->opened = 0;
1398 mutex_unlock(&dev->link_lock);
1399
1400 emac_rx_disable(dev);
1401 emac_tx_disable(dev);
1402 mal_disable_rx_channel(dev->mal, dev->mal_rx_chan);
1403 mal_disable_tx_channel(dev->mal, dev->mal_tx_chan);
1404 mal_poll_del(dev->mal, &dev->commac);
1405
1406 emac_clean_tx_ring(dev);
1407 emac_clean_rx_ring(dev);
1408
1409 free_irq(dev->emac_irq, dev);
1410
1411 netif_carrier_off(ndev);
1412
1413 return 0;
1414 }
1415
1416 static inline u16 emac_tx_csum(struct emac_instance *dev,
1417 struct sk_buff *skb)
1418 {
1419 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH) &&
1420 (skb->ip_summed == CHECKSUM_PARTIAL)) {
1421 ++dev->stats.tx_packets_csum;
1422 return EMAC_TX_CTRL_TAH_CSUM;
1423 }
1424 return 0;
1425 }
1426
1427 static inline netdev_tx_t emac_xmit_finish(struct emac_instance *dev, int len)
1428 {
1429 struct emac_regs __iomem *p = dev->emacp;
1430 struct net_device *ndev = dev->ndev;
1431
1432 /* Send the packet out. If the if makes a significant perf
1433 * difference, then we can store the TMR0 value in "dev"
1434 * instead
1435 */
1436 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
1437 out_be32(&p->tmr0, EMAC4_TMR0_XMIT);
1438 else
1439 out_be32(&p->tmr0, EMAC_TMR0_XMIT);
1440
1441 if (unlikely(++dev->tx_cnt == NUM_TX_BUFF)) {
1442 netif_stop_queue(ndev);
1443 DBG2(dev, "stopped TX queue" NL);
1444 }
1445
1446 netif_trans_update(ndev);
1447 ++dev->stats.tx_packets;
1448 dev->stats.tx_bytes += len;
1449
1450 return NETDEV_TX_OK;
1451 }
1452
1453 /* Tx lock BH */
1454 static netdev_tx_t emac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1455 {
1456 struct emac_instance *dev = netdev_priv(ndev);
1457 unsigned int len = skb->len;
1458 int slot;
1459
1460 u16 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1461 MAL_TX_CTRL_LAST | emac_tx_csum(dev, skb);
1462
1463 slot = dev->tx_slot++;
1464 if (dev->tx_slot == NUM_TX_BUFF) {
1465 dev->tx_slot = 0;
1466 ctrl |= MAL_TX_CTRL_WRAP;
1467 }
1468
1469 DBG2(dev, "xmit(%u) %d" NL, len, slot);
1470
1471 dev->tx_skb[slot] = skb;
1472 dev->tx_desc[slot].data_ptr = dma_map_single(&dev->ofdev->dev,
1473 skb->data, len,
1474 DMA_TO_DEVICE);
1475 dev->tx_desc[slot].data_len = (u16) len;
1476 wmb();
1477 dev->tx_desc[slot].ctrl = ctrl;
1478
1479 return emac_xmit_finish(dev, len);
1480 }
1481
1482 static inline int emac_xmit_split(struct emac_instance *dev, int slot,
1483 u32 pd, int len, int last, u16 base_ctrl)
1484 {
1485 while (1) {
1486 u16 ctrl = base_ctrl;
1487 int chunk = min(len, MAL_MAX_TX_SIZE);
1488 len -= chunk;
1489
1490 slot = (slot + 1) % NUM_TX_BUFF;
1491
1492 if (last && !len)
1493 ctrl |= MAL_TX_CTRL_LAST;
1494 if (slot == NUM_TX_BUFF - 1)
1495 ctrl |= MAL_TX_CTRL_WRAP;
1496
1497 dev->tx_skb[slot] = NULL;
1498 dev->tx_desc[slot].data_ptr = pd;
1499 dev->tx_desc[slot].data_len = (u16) chunk;
1500 dev->tx_desc[slot].ctrl = ctrl;
1501 ++dev->tx_cnt;
1502
1503 if (!len)
1504 break;
1505
1506 pd += chunk;
1507 }
1508 return slot;
1509 }
1510
1511 /* Tx lock BH disabled (SG version for TAH equipped EMACs) */
1512 static netdev_tx_t
1513 emac_start_xmit_sg(struct sk_buff *skb, struct net_device *ndev)
1514 {
1515 struct emac_instance *dev = netdev_priv(ndev);
1516 int nr_frags = skb_shinfo(skb)->nr_frags;
1517 int len = skb->len, chunk;
1518 int slot, i;
1519 u16 ctrl;
1520 u32 pd;
1521
1522 /* This is common "fast" path */
1523 if (likely(!nr_frags && len <= MAL_MAX_TX_SIZE))
1524 return emac_start_xmit(skb, ndev);
1525
1526 len -= skb->data_len;
1527
1528 /* Note, this is only an *estimation*, we can still run out of empty
1529 * slots because of the additional fragmentation into
1530 * MAL_MAX_TX_SIZE-sized chunks
1531 */
1532 if (unlikely(dev->tx_cnt + nr_frags + mal_tx_chunks(len) > NUM_TX_BUFF))
1533 goto stop_queue;
1534
1535 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1536 emac_tx_csum(dev, skb);
1537 slot = dev->tx_slot;
1538
1539 /* skb data */
1540 dev->tx_skb[slot] = NULL;
1541 chunk = min(len, MAL_MAX_TX_SIZE);
1542 dev->tx_desc[slot].data_ptr = pd =
1543 dma_map_single(&dev->ofdev->dev, skb->data, len, DMA_TO_DEVICE);
1544 dev->tx_desc[slot].data_len = (u16) chunk;
1545 len -= chunk;
1546 if (unlikely(len))
1547 slot = emac_xmit_split(dev, slot, pd + chunk, len, !nr_frags,
1548 ctrl);
1549 /* skb fragments */
1550 for (i = 0; i < nr_frags; ++i) {
1551 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1552 len = skb_frag_size(frag);
1553
1554 if (unlikely(dev->tx_cnt + mal_tx_chunks(len) >= NUM_TX_BUFF))
1555 goto undo_frame;
1556
1557 pd = skb_frag_dma_map(&dev->ofdev->dev, frag, 0, len,
1558 DMA_TO_DEVICE);
1559
1560 slot = emac_xmit_split(dev, slot, pd, len, i == nr_frags - 1,
1561 ctrl);
1562 }
1563
1564 DBG2(dev, "xmit_sg(%u) %d - %d" NL, skb->len, dev->tx_slot, slot);
1565
1566 /* Attach skb to the last slot so we don't release it too early */
1567 dev->tx_skb[slot] = skb;
1568
1569 /* Send the packet out */
1570 if (dev->tx_slot == NUM_TX_BUFF - 1)
1571 ctrl |= MAL_TX_CTRL_WRAP;
1572 wmb();
1573 dev->tx_desc[dev->tx_slot].ctrl = ctrl;
1574 dev->tx_slot = (slot + 1) % NUM_TX_BUFF;
1575
1576 return emac_xmit_finish(dev, skb->len);
1577
1578 undo_frame:
1579 /* Well, too bad. Our previous estimation was overly optimistic.
1580 * Undo everything.
1581 */
1582 while (slot != dev->tx_slot) {
1583 dev->tx_desc[slot].ctrl = 0;
1584 --dev->tx_cnt;
1585 if (--slot < 0)
1586 slot = NUM_TX_BUFF - 1;
1587 }
1588 ++dev->estats.tx_undo;
1589
1590 stop_queue:
1591 netif_stop_queue(ndev);
1592 DBG2(dev, "stopped TX queue" NL);
1593 return NETDEV_TX_BUSY;
1594 }
1595
1596 /* Tx lock BHs */
1597 static void emac_parse_tx_error(struct emac_instance *dev, u16 ctrl)
1598 {
1599 struct emac_error_stats *st = &dev->estats;
1600
1601 DBG(dev, "BD TX error %04x" NL, ctrl);
1602
1603 ++st->tx_bd_errors;
1604 if (ctrl & EMAC_TX_ST_BFCS)
1605 ++st->tx_bd_bad_fcs;
1606 if (ctrl & EMAC_TX_ST_LCS)
1607 ++st->tx_bd_carrier_loss;
1608 if (ctrl & EMAC_TX_ST_ED)
1609 ++st->tx_bd_excessive_deferral;
1610 if (ctrl & EMAC_TX_ST_EC)
1611 ++st->tx_bd_excessive_collisions;
1612 if (ctrl & EMAC_TX_ST_LC)
1613 ++st->tx_bd_late_collision;
1614 if (ctrl & EMAC_TX_ST_MC)
1615 ++st->tx_bd_multple_collisions;
1616 if (ctrl & EMAC_TX_ST_SC)
1617 ++st->tx_bd_single_collision;
1618 if (ctrl & EMAC_TX_ST_UR)
1619 ++st->tx_bd_underrun;
1620 if (ctrl & EMAC_TX_ST_SQE)
1621 ++st->tx_bd_sqe;
1622 }
1623
1624 static void emac_poll_tx(void *param)
1625 {
1626 struct emac_instance *dev = param;
1627 u32 bad_mask;
1628
1629 DBG2(dev, "poll_tx, %d %d" NL, dev->tx_cnt, dev->ack_slot);
1630
1631 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
1632 bad_mask = EMAC_IS_BAD_TX_TAH;
1633 else
1634 bad_mask = EMAC_IS_BAD_TX;
1635
1636 netif_tx_lock_bh(dev->ndev);
1637 if (dev->tx_cnt) {
1638 u16 ctrl;
1639 int slot = dev->ack_slot, n = 0;
1640 again:
1641 ctrl = dev->tx_desc[slot].ctrl;
1642 if (!(ctrl & MAL_TX_CTRL_READY)) {
1643 struct sk_buff *skb = dev->tx_skb[slot];
1644 ++n;
1645
1646 if (skb) {
1647 dev_kfree_skb(skb);
1648 dev->tx_skb[slot] = NULL;
1649 }
1650 slot = (slot + 1) % NUM_TX_BUFF;
1651
1652 if (unlikely(ctrl & bad_mask))
1653 emac_parse_tx_error(dev, ctrl);
1654
1655 if (--dev->tx_cnt)
1656 goto again;
1657 }
1658 if (n) {
1659 dev->ack_slot = slot;
1660 if (netif_queue_stopped(dev->ndev) &&
1661 dev->tx_cnt < EMAC_TX_WAKEUP_THRESH)
1662 netif_wake_queue(dev->ndev);
1663
1664 DBG2(dev, "tx %d pkts" NL, n);
1665 }
1666 }
1667 netif_tx_unlock_bh(dev->ndev);
1668 }
1669
1670 static inline void emac_recycle_rx_skb(struct emac_instance *dev, int slot,
1671 int len)
1672 {
1673 struct sk_buff *skb = dev->rx_skb[slot];
1674
1675 DBG2(dev, "recycle %d %d" NL, slot, len);
1676
1677 if (len)
1678 dma_map_single(&dev->ofdev->dev, skb->data - NET_IP_ALIGN,
1679 SKB_DATA_ALIGN(len + NET_IP_ALIGN),
1680 DMA_FROM_DEVICE);
1681
1682 dev->rx_desc[slot].data_len = 0;
1683 wmb();
1684 dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
1685 (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1686 }
1687
1688 static void emac_parse_rx_error(struct emac_instance *dev, u16 ctrl)
1689 {
1690 struct emac_error_stats *st = &dev->estats;
1691
1692 DBG(dev, "BD RX error %04x" NL, ctrl);
1693
1694 ++st->rx_bd_errors;
1695 if (ctrl & EMAC_RX_ST_OE)
1696 ++st->rx_bd_overrun;
1697 if (ctrl & EMAC_RX_ST_BP)
1698 ++st->rx_bd_bad_packet;
1699 if (ctrl & EMAC_RX_ST_RP)
1700 ++st->rx_bd_runt_packet;
1701 if (ctrl & EMAC_RX_ST_SE)
1702 ++st->rx_bd_short_event;
1703 if (ctrl & EMAC_RX_ST_AE)
1704 ++st->rx_bd_alignment_error;
1705 if (ctrl & EMAC_RX_ST_BFCS)
1706 ++st->rx_bd_bad_fcs;
1707 if (ctrl & EMAC_RX_ST_PTL)
1708 ++st->rx_bd_packet_too_long;
1709 if (ctrl & EMAC_RX_ST_ORE)
1710 ++st->rx_bd_out_of_range;
1711 if (ctrl & EMAC_RX_ST_IRE)
1712 ++st->rx_bd_in_range;
1713 }
1714
1715 static inline void emac_rx_csum(struct emac_instance *dev,
1716 struct sk_buff *skb, u16 ctrl)
1717 {
1718 #ifdef CONFIG_IBM_EMAC_TAH
1719 if (!ctrl && dev->tah_dev) {
1720 skb->ip_summed = CHECKSUM_UNNECESSARY;
1721 ++dev->stats.rx_packets_csum;
1722 }
1723 #endif
1724 }
1725
1726 static inline int emac_rx_sg_append(struct emac_instance *dev, int slot)
1727 {
1728 if (likely(dev->rx_sg_skb != NULL)) {
1729 int len = dev->rx_desc[slot].data_len;
1730 int tot_len = dev->rx_sg_skb->len + len;
1731
1732 if (unlikely(tot_len + NET_IP_ALIGN > dev->rx_skb_size)) {
1733 ++dev->estats.rx_dropped_mtu;
1734 dev_kfree_skb(dev->rx_sg_skb);
1735 dev->rx_sg_skb = NULL;
1736 } else {
1737 memcpy(skb_tail_pointer(dev->rx_sg_skb),
1738 dev->rx_skb[slot]->data, len);
1739 skb_put(dev->rx_sg_skb, len);
1740 emac_recycle_rx_skb(dev, slot, len);
1741 return 0;
1742 }
1743 }
1744 emac_recycle_rx_skb(dev, slot, 0);
1745 return -1;
1746 }
1747
1748 /* NAPI poll context */
1749 static int emac_poll_rx(void *param, int budget)
1750 {
1751 struct emac_instance *dev = param;
1752 int slot = dev->rx_slot, received = 0;
1753
1754 DBG2(dev, "poll_rx(%d)" NL, budget);
1755
1756 again:
1757 while (budget > 0) {
1758 int len;
1759 struct sk_buff *skb;
1760 u16 ctrl = dev->rx_desc[slot].ctrl;
1761
1762 if (ctrl & MAL_RX_CTRL_EMPTY)
1763 break;
1764
1765 skb = dev->rx_skb[slot];
1766 mb();
1767 len = dev->rx_desc[slot].data_len;
1768
1769 if (unlikely(!MAL_IS_SINGLE_RX(ctrl)))
1770 goto sg;
1771
1772 ctrl &= EMAC_BAD_RX_MASK;
1773 if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1774 emac_parse_rx_error(dev, ctrl);
1775 ++dev->estats.rx_dropped_error;
1776 emac_recycle_rx_skb(dev, slot, 0);
1777 len = 0;
1778 goto next;
1779 }
1780
1781 if (len < ETH_HLEN) {
1782 ++dev->estats.rx_dropped_stack;
1783 emac_recycle_rx_skb(dev, slot, len);
1784 goto next;
1785 }
1786
1787 if (len && len < EMAC_RX_COPY_THRESH) {
1788 struct sk_buff *copy_skb;
1789
1790 copy_skb = napi_alloc_skb(&dev->mal->napi, len);
1791 if (unlikely(!copy_skb))
1792 goto oom;
1793
1794 memcpy(copy_skb->data - NET_IP_ALIGN,
1795 skb->data - NET_IP_ALIGN,
1796 len + NET_IP_ALIGN);
1797 emac_recycle_rx_skb(dev, slot, len);
1798 skb = copy_skb;
1799 } else if (unlikely(emac_alloc_rx_skb_napi(dev, slot)))
1800 goto oom;
1801
1802 skb_put(skb, len);
1803 push_packet:
1804 skb->protocol = eth_type_trans(skb, dev->ndev);
1805 emac_rx_csum(dev, skb, ctrl);
1806
1807 if (unlikely(netif_receive_skb(skb) == NET_RX_DROP))
1808 ++dev->estats.rx_dropped_stack;
1809 next:
1810 ++dev->stats.rx_packets;
1811 skip:
1812 dev->stats.rx_bytes += len;
1813 slot = (slot + 1) % NUM_RX_BUFF;
1814 --budget;
1815 ++received;
1816 continue;
1817 sg:
1818 if (ctrl & MAL_RX_CTRL_FIRST) {
1819 BUG_ON(dev->rx_sg_skb);
1820 if (unlikely(emac_alloc_rx_skb_napi(dev, slot))) {
1821 DBG(dev, "rx OOM %d" NL, slot);
1822 ++dev->estats.rx_dropped_oom;
1823 emac_recycle_rx_skb(dev, slot, 0);
1824 } else {
1825 dev->rx_sg_skb = skb;
1826 skb_put(skb, len);
1827 }
1828 } else if (!emac_rx_sg_append(dev, slot) &&
1829 (ctrl & MAL_RX_CTRL_LAST)) {
1830
1831 skb = dev->rx_sg_skb;
1832 dev->rx_sg_skb = NULL;
1833
1834 ctrl &= EMAC_BAD_RX_MASK;
1835 if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1836 emac_parse_rx_error(dev, ctrl);
1837 ++dev->estats.rx_dropped_error;
1838 dev_kfree_skb(skb);
1839 len = 0;
1840 } else
1841 goto push_packet;
1842 }
1843 goto skip;
1844 oom:
1845 DBG(dev, "rx OOM %d" NL, slot);
1846 /* Drop the packet and recycle skb */
1847 ++dev->estats.rx_dropped_oom;
1848 emac_recycle_rx_skb(dev, slot, 0);
1849 goto next;
1850 }
1851
1852 if (received) {
1853 DBG2(dev, "rx %d BDs" NL, received);
1854 dev->rx_slot = slot;
1855 }
1856
1857 if (unlikely(budget && test_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags))) {
1858 mb();
1859 if (!(dev->rx_desc[slot].ctrl & MAL_RX_CTRL_EMPTY)) {
1860 DBG2(dev, "rx restart" NL);
1861 received = 0;
1862 goto again;
1863 }
1864
1865 if (dev->rx_sg_skb) {
1866 DBG2(dev, "dropping partial rx packet" NL);
1867 ++dev->estats.rx_dropped_error;
1868 dev_kfree_skb(dev->rx_sg_skb);
1869 dev->rx_sg_skb = NULL;
1870 }
1871
1872 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1873 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1874 emac_rx_enable(dev);
1875 dev->rx_slot = 0;
1876 }
1877 return received;
1878 }
1879
1880 /* NAPI poll context */
1881 static int emac_peek_rx(void *param)
1882 {
1883 struct emac_instance *dev = param;
1884
1885 return !(dev->rx_desc[dev->rx_slot].ctrl & MAL_RX_CTRL_EMPTY);
1886 }
1887
1888 /* NAPI poll context */
1889 static int emac_peek_rx_sg(void *param)
1890 {
1891 struct emac_instance *dev = param;
1892
1893 int slot = dev->rx_slot;
1894 while (1) {
1895 u16 ctrl = dev->rx_desc[slot].ctrl;
1896 if (ctrl & MAL_RX_CTRL_EMPTY)
1897 return 0;
1898 else if (ctrl & MAL_RX_CTRL_LAST)
1899 return 1;
1900
1901 slot = (slot + 1) % NUM_RX_BUFF;
1902
1903 /* I'm just being paranoid here :) */
1904 if (unlikely(slot == dev->rx_slot))
1905 return 0;
1906 }
1907 }
1908
1909 /* Hard IRQ */
1910 static void emac_rxde(void *param)
1911 {
1912 struct emac_instance *dev = param;
1913
1914 ++dev->estats.rx_stopped;
1915 emac_rx_disable_async(dev);
1916 }
1917
1918 /* Hard IRQ */
1919 static irqreturn_t emac_irq(int irq, void *dev_instance)
1920 {
1921 struct emac_instance *dev = dev_instance;
1922 struct emac_regs __iomem *p = dev->emacp;
1923 struct emac_error_stats *st = &dev->estats;
1924 u32 isr;
1925
1926 spin_lock(&dev->lock);
1927
1928 isr = in_be32(&p->isr);
1929 out_be32(&p->isr, isr);
1930
1931 DBG(dev, "isr = %08x" NL, isr);
1932
1933 if (isr & EMAC4_ISR_TXPE)
1934 ++st->tx_parity;
1935 if (isr & EMAC4_ISR_RXPE)
1936 ++st->rx_parity;
1937 if (isr & EMAC4_ISR_TXUE)
1938 ++st->tx_underrun;
1939 if (isr & EMAC4_ISR_RXOE)
1940 ++st->rx_fifo_overrun;
1941 if (isr & EMAC_ISR_OVR)
1942 ++st->rx_overrun;
1943 if (isr & EMAC_ISR_BP)
1944 ++st->rx_bad_packet;
1945 if (isr & EMAC_ISR_RP)
1946 ++st->rx_runt_packet;
1947 if (isr & EMAC_ISR_SE)
1948 ++st->rx_short_event;
1949 if (isr & EMAC_ISR_ALE)
1950 ++st->rx_alignment_error;
1951 if (isr & EMAC_ISR_BFCS)
1952 ++st->rx_bad_fcs;
1953 if (isr & EMAC_ISR_PTLE)
1954 ++st->rx_packet_too_long;
1955 if (isr & EMAC_ISR_ORE)
1956 ++st->rx_out_of_range;
1957 if (isr & EMAC_ISR_IRE)
1958 ++st->rx_in_range;
1959 if (isr & EMAC_ISR_SQE)
1960 ++st->tx_sqe;
1961 if (isr & EMAC_ISR_TE)
1962 ++st->tx_errors;
1963
1964 spin_unlock(&dev->lock);
1965
1966 return IRQ_HANDLED;
1967 }
1968
1969 static struct net_device_stats *emac_stats(struct net_device *ndev)
1970 {
1971 struct emac_instance *dev = netdev_priv(ndev);
1972 struct emac_stats *st = &dev->stats;
1973 struct emac_error_stats *est = &dev->estats;
1974 struct net_device_stats *nst = &ndev->stats;
1975 unsigned long flags;
1976
1977 DBG2(dev, "stats" NL);
1978
1979 /* Compute "legacy" statistics */
1980 spin_lock_irqsave(&dev->lock, flags);
1981 nst->rx_packets = (unsigned long)st->rx_packets;
1982 nst->rx_bytes = (unsigned long)st->rx_bytes;
1983 nst->tx_packets = (unsigned long)st->tx_packets;
1984 nst->tx_bytes = (unsigned long)st->tx_bytes;
1985 nst->rx_dropped = (unsigned long)(est->rx_dropped_oom +
1986 est->rx_dropped_error +
1987 est->rx_dropped_resize +
1988 est->rx_dropped_mtu);
1989 nst->tx_dropped = (unsigned long)est->tx_dropped;
1990
1991 nst->rx_errors = (unsigned long)est->rx_bd_errors;
1992 nst->rx_fifo_errors = (unsigned long)(est->rx_bd_overrun +
1993 est->rx_fifo_overrun +
1994 est->rx_overrun);
1995 nst->rx_frame_errors = (unsigned long)(est->rx_bd_alignment_error +
1996 est->rx_alignment_error);
1997 nst->rx_crc_errors = (unsigned long)(est->rx_bd_bad_fcs +
1998 est->rx_bad_fcs);
1999 nst->rx_length_errors = (unsigned long)(est->rx_bd_runt_packet +
2000 est->rx_bd_short_event +
2001 est->rx_bd_packet_too_long +
2002 est->rx_bd_out_of_range +
2003 est->rx_bd_in_range +
2004 est->rx_runt_packet +
2005 est->rx_short_event +
2006 est->rx_packet_too_long +
2007 est->rx_out_of_range +
2008 est->rx_in_range);
2009
2010 nst->tx_errors = (unsigned long)(est->tx_bd_errors + est->tx_errors);
2011 nst->tx_fifo_errors = (unsigned long)(est->tx_bd_underrun +
2012 est->tx_underrun);
2013 nst->tx_carrier_errors = (unsigned long)est->tx_bd_carrier_loss;
2014 nst->collisions = (unsigned long)(est->tx_bd_excessive_deferral +
2015 est->tx_bd_excessive_collisions +
2016 est->tx_bd_late_collision +
2017 est->tx_bd_multple_collisions);
2018 spin_unlock_irqrestore(&dev->lock, flags);
2019 return nst;
2020 }
2021
2022 static struct mal_commac_ops emac_commac_ops = {
2023 .poll_tx = &emac_poll_tx,
2024 .poll_rx = &emac_poll_rx,
2025 .peek_rx = &emac_peek_rx,
2026 .rxde = &emac_rxde,
2027 };
2028
2029 static struct mal_commac_ops emac_commac_sg_ops = {
2030 .poll_tx = &emac_poll_tx,
2031 .poll_rx = &emac_poll_rx,
2032 .peek_rx = &emac_peek_rx_sg,
2033 .rxde = &emac_rxde,
2034 };
2035
2036 /* Ethtool support */
2037 static int emac_ethtool_get_link_ksettings(struct net_device *ndev,
2038 struct ethtool_link_ksettings *cmd)
2039 {
2040 struct emac_instance *dev = netdev_priv(ndev);
2041 u32 supported, advertising;
2042
2043 supported = dev->phy.features;
2044 cmd->base.port = PORT_MII;
2045 cmd->base.phy_address = dev->phy.address;
2046
2047 mutex_lock(&dev->link_lock);
2048 advertising = dev->phy.advertising;
2049 cmd->base.autoneg = dev->phy.autoneg;
2050 cmd->base.speed = dev->phy.speed;
2051 cmd->base.duplex = dev->phy.duplex;
2052 mutex_unlock(&dev->link_lock);
2053
2054 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
2055 supported);
2056 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
2057 advertising);
2058
2059 return 0;
2060 }
2061
2062 static int
2063 emac_ethtool_set_link_ksettings(struct net_device *ndev,
2064 const struct ethtool_link_ksettings *cmd)
2065 {
2066 struct emac_instance *dev = netdev_priv(ndev);
2067 u32 f = dev->phy.features;
2068 u32 advertising;
2069
2070 ethtool_convert_link_mode_to_legacy_u32(&advertising,
2071 cmd->link_modes.advertising);
2072
2073 DBG(dev, "set_settings(%d, %d, %d, 0x%08x)" NL,
2074 cmd->base.autoneg, cmd->base.speed, cmd->base.duplex, advertising);
2075
2076 /* Basic sanity checks */
2077 if (dev->phy.address < 0)
2078 return -EOPNOTSUPP;
2079 if (cmd->base.autoneg != AUTONEG_ENABLE &&
2080 cmd->base.autoneg != AUTONEG_DISABLE)
2081 return -EINVAL;
2082 if (cmd->base.autoneg == AUTONEG_ENABLE && advertising == 0)
2083 return -EINVAL;
2084 if (cmd->base.duplex != DUPLEX_HALF && cmd->base.duplex != DUPLEX_FULL)
2085 return -EINVAL;
2086
2087 if (cmd->base.autoneg == AUTONEG_DISABLE) {
2088 switch (cmd->base.speed) {
2089 case SPEED_10:
2090 if (cmd->base.duplex == DUPLEX_HALF &&
2091 !(f & SUPPORTED_10baseT_Half))
2092 return -EINVAL;
2093 if (cmd->base.duplex == DUPLEX_FULL &&
2094 !(f & SUPPORTED_10baseT_Full))
2095 return -EINVAL;
2096 break;
2097 case SPEED_100:
2098 if (cmd->base.duplex == DUPLEX_HALF &&
2099 !(f & SUPPORTED_100baseT_Half))
2100 return -EINVAL;
2101 if (cmd->base.duplex == DUPLEX_FULL &&
2102 !(f & SUPPORTED_100baseT_Full))
2103 return -EINVAL;
2104 break;
2105 case SPEED_1000:
2106 if (cmd->base.duplex == DUPLEX_HALF &&
2107 !(f & SUPPORTED_1000baseT_Half))
2108 return -EINVAL;
2109 if (cmd->base.duplex == DUPLEX_FULL &&
2110 !(f & SUPPORTED_1000baseT_Full))
2111 return -EINVAL;
2112 break;
2113 default:
2114 return -EINVAL;
2115 }
2116
2117 mutex_lock(&dev->link_lock);
2118 dev->phy.def->ops->setup_forced(&dev->phy, cmd->base.speed,
2119 cmd->base.duplex);
2120 mutex_unlock(&dev->link_lock);
2121
2122 } else {
2123 if (!(f & SUPPORTED_Autoneg))
2124 return -EINVAL;
2125
2126 mutex_lock(&dev->link_lock);
2127 dev->phy.def->ops->setup_aneg(&dev->phy,
2128 (advertising & f) |
2129 (dev->phy.advertising &
2130 (ADVERTISED_Pause |
2131 ADVERTISED_Asym_Pause)));
2132 mutex_unlock(&dev->link_lock);
2133 }
2134 emac_force_link_update(dev);
2135
2136 return 0;
2137 }
2138
2139 static void emac_ethtool_get_ringparam(struct net_device *ndev,
2140 struct ethtool_ringparam *rp)
2141 {
2142 rp->rx_max_pending = rp->rx_pending = NUM_RX_BUFF;
2143 rp->tx_max_pending = rp->tx_pending = NUM_TX_BUFF;
2144 }
2145
2146 static void emac_ethtool_get_pauseparam(struct net_device *ndev,
2147 struct ethtool_pauseparam *pp)
2148 {
2149 struct emac_instance *dev = netdev_priv(ndev);
2150
2151 mutex_lock(&dev->link_lock);
2152 if ((dev->phy.features & SUPPORTED_Autoneg) &&
2153 (dev->phy.advertising & (ADVERTISED_Pause | ADVERTISED_Asym_Pause)))
2154 pp->autoneg = 1;
2155
2156 if (dev->phy.duplex == DUPLEX_FULL) {
2157 if (dev->phy.pause)
2158 pp->rx_pause = pp->tx_pause = 1;
2159 else if (dev->phy.asym_pause)
2160 pp->tx_pause = 1;
2161 }
2162 mutex_unlock(&dev->link_lock);
2163 }
2164
2165 static int emac_get_regs_len(struct emac_instance *dev)
2166 {
2167 return sizeof(struct emac_ethtool_regs_subhdr) +
2168 sizeof(struct emac_regs);
2169 }
2170
2171 static int emac_ethtool_get_regs_len(struct net_device *ndev)
2172 {
2173 struct emac_instance *dev = netdev_priv(ndev);
2174 int size;
2175
2176 size = sizeof(struct emac_ethtool_regs_hdr) +
2177 emac_get_regs_len(dev) + mal_get_regs_len(dev->mal);
2178 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
2179 size += zmii_get_regs_len(dev->zmii_dev);
2180 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
2181 size += rgmii_get_regs_len(dev->rgmii_dev);
2182 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
2183 size += tah_get_regs_len(dev->tah_dev);
2184
2185 return size;
2186 }
2187
2188 static void *emac_dump_regs(struct emac_instance *dev, void *buf)
2189 {
2190 struct emac_ethtool_regs_subhdr *hdr = buf;
2191
2192 hdr->index = dev->cell_index;
2193 if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {
2194 hdr->version = EMAC4SYNC_ETHTOOL_REGS_VER;
2195 } else if (emac_has_feature(dev, EMAC_FTR_EMAC4)) {
2196 hdr->version = EMAC4_ETHTOOL_REGS_VER;
2197 } else {
2198 hdr->version = EMAC_ETHTOOL_REGS_VER;
2199 }
2200 memcpy_fromio(hdr + 1, dev->emacp, sizeof(struct emac_regs));
2201 return (void *)(hdr + 1) + sizeof(struct emac_regs);
2202 }
2203
2204 static void emac_ethtool_get_regs(struct net_device *ndev,
2205 struct ethtool_regs *regs, void *buf)
2206 {
2207 struct emac_instance *dev = netdev_priv(ndev);
2208 struct emac_ethtool_regs_hdr *hdr = buf;
2209
2210 hdr->components = 0;
2211 buf = hdr + 1;
2212
2213 buf = mal_dump_regs(dev->mal, buf);
2214 buf = emac_dump_regs(dev, buf);
2215 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII)) {
2216 hdr->components |= EMAC_ETHTOOL_REGS_ZMII;
2217 buf = zmii_dump_regs(dev->zmii_dev, buf);
2218 }
2219 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII)) {
2220 hdr->components |= EMAC_ETHTOOL_REGS_RGMII;
2221 buf = rgmii_dump_regs(dev->rgmii_dev, buf);
2222 }
2223 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH)) {
2224 hdr->components |= EMAC_ETHTOOL_REGS_TAH;
2225 buf = tah_dump_regs(dev->tah_dev, buf);
2226 }
2227 }
2228
2229 static int emac_ethtool_nway_reset(struct net_device *ndev)
2230 {
2231 struct emac_instance *dev = netdev_priv(ndev);
2232 int res = 0;
2233
2234 DBG(dev, "nway_reset" NL);
2235
2236 if (dev->phy.address < 0)
2237 return -EOPNOTSUPP;
2238
2239 mutex_lock(&dev->link_lock);
2240 if (!dev->phy.autoneg) {
2241 res = -EINVAL;
2242 goto out;
2243 }
2244
2245 dev->phy.def->ops->setup_aneg(&dev->phy, dev->phy.advertising);
2246 out:
2247 mutex_unlock(&dev->link_lock);
2248 emac_force_link_update(dev);
2249 return res;
2250 }
2251
2252 static int emac_ethtool_get_sset_count(struct net_device *ndev, int stringset)
2253 {
2254 if (stringset == ETH_SS_STATS)
2255 return EMAC_ETHTOOL_STATS_COUNT;
2256 else
2257 return -EINVAL;
2258 }
2259
2260 static void emac_ethtool_get_strings(struct net_device *ndev, u32 stringset,
2261 u8 * buf)
2262 {
2263 if (stringset == ETH_SS_STATS)
2264 memcpy(buf, &emac_stats_keys, sizeof(emac_stats_keys));
2265 }
2266
2267 static void emac_ethtool_get_ethtool_stats(struct net_device *ndev,
2268 struct ethtool_stats *estats,
2269 u64 * tmp_stats)
2270 {
2271 struct emac_instance *dev = netdev_priv(ndev);
2272
2273 memcpy(tmp_stats, &dev->stats, sizeof(dev->stats));
2274 tmp_stats += sizeof(dev->stats) / sizeof(u64);
2275 memcpy(tmp_stats, &dev->estats, sizeof(dev->estats));
2276 }
2277
2278 static void emac_ethtool_get_drvinfo(struct net_device *ndev,
2279 struct ethtool_drvinfo *info)
2280 {
2281 struct emac_instance *dev = netdev_priv(ndev);
2282
2283 strlcpy(info->driver, "ibm_emac", sizeof(info->driver));
2284 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
2285 snprintf(info->bus_info, sizeof(info->bus_info), "PPC 4xx EMAC-%d %pOF",
2286 dev->cell_index, dev->ofdev->dev.of_node);
2287 }
2288
2289 static const struct ethtool_ops emac_ethtool_ops = {
2290 .get_drvinfo = emac_ethtool_get_drvinfo,
2291
2292 .get_regs_len = emac_ethtool_get_regs_len,
2293 .get_regs = emac_ethtool_get_regs,
2294
2295 .nway_reset = emac_ethtool_nway_reset,
2296
2297 .get_ringparam = emac_ethtool_get_ringparam,
2298 .get_pauseparam = emac_ethtool_get_pauseparam,
2299
2300 .get_strings = emac_ethtool_get_strings,
2301 .get_sset_count = emac_ethtool_get_sset_count,
2302 .get_ethtool_stats = emac_ethtool_get_ethtool_stats,
2303
2304 .get_link = ethtool_op_get_link,
2305 .get_link_ksettings = emac_ethtool_get_link_ksettings,
2306 .set_link_ksettings = emac_ethtool_set_link_ksettings,
2307 };
2308
2309 static int emac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
2310 {
2311 struct emac_instance *dev = netdev_priv(ndev);
2312 struct mii_ioctl_data *data = if_mii(rq);
2313
2314 DBG(dev, "ioctl %08x" NL, cmd);
2315
2316 if (dev->phy.address < 0)
2317 return -EOPNOTSUPP;
2318
2319 switch (cmd) {
2320 case SIOCGMIIPHY:
2321 data->phy_id = dev->phy.address;
2322 fallthrough;
2323 case SIOCGMIIREG:
2324 data->val_out = emac_mdio_read(ndev, dev->phy.address,
2325 data->reg_num);
2326 return 0;
2327
2328 case SIOCSMIIREG:
2329 emac_mdio_write(ndev, dev->phy.address, data->reg_num,
2330 data->val_in);
2331 return 0;
2332 default:
2333 return -EOPNOTSUPP;
2334 }
2335 }
2336
2337 struct emac_depentry {
2338 u32 phandle;
2339 struct device_node *node;
2340 struct platform_device *ofdev;
2341 void *drvdata;
2342 };
2343
2344 #define EMAC_DEP_MAL_IDX 0
2345 #define EMAC_DEP_ZMII_IDX 1
2346 #define EMAC_DEP_RGMII_IDX 2
2347 #define EMAC_DEP_TAH_IDX 3
2348 #define EMAC_DEP_MDIO_IDX 4
2349 #define EMAC_DEP_PREV_IDX 5
2350 #define EMAC_DEP_COUNT 6
2351
2352 static int emac_check_deps(struct emac_instance *dev,
2353 struct emac_depentry *deps)
2354 {
2355 int i, there = 0;
2356 struct device_node *np;
2357
2358 for (i = 0; i < EMAC_DEP_COUNT; i++) {
2359 /* no dependency on that item, allright */
2360 if (deps[i].phandle == 0) {
2361 there++;
2362 continue;
2363 }
2364 /* special case for blist as the dependency might go away */
2365 if (i == EMAC_DEP_PREV_IDX) {
2366 np = *(dev->blist - 1);
2367 if (np == NULL) {
2368 deps[i].phandle = 0;
2369 there++;
2370 continue;
2371 }
2372 if (deps[i].node == NULL)
2373 deps[i].node = of_node_get(np);
2374 }
2375 if (deps[i].node == NULL)
2376 deps[i].node = of_find_node_by_phandle(deps[i].phandle);
2377 if (deps[i].node == NULL)
2378 continue;
2379 if (deps[i].ofdev == NULL)
2380 deps[i].ofdev = of_find_device_by_node(deps[i].node);
2381 if (deps[i].ofdev == NULL)
2382 continue;
2383 if (deps[i].drvdata == NULL)
2384 deps[i].drvdata = platform_get_drvdata(deps[i].ofdev);
2385 if (deps[i].drvdata != NULL)
2386 there++;
2387 }
2388 return there == EMAC_DEP_COUNT;
2389 }
2390
2391 static void emac_put_deps(struct emac_instance *dev)
2392 {
2393 of_dev_put(dev->mal_dev);
2394 of_dev_put(dev->zmii_dev);
2395 of_dev_put(dev->rgmii_dev);
2396 of_dev_put(dev->mdio_dev);
2397 of_dev_put(dev->tah_dev);
2398 }
2399
2400 static int emac_of_bus_notify(struct notifier_block *nb, unsigned long action,
2401 void *data)
2402 {
2403 /* We are only intereted in device addition */
2404 if (action == BUS_NOTIFY_BOUND_DRIVER)
2405 wake_up_all(&emac_probe_wait);
2406 return 0;
2407 }
2408
2409 static struct notifier_block emac_of_bus_notifier = {
2410 .notifier_call = emac_of_bus_notify
2411 };
2412
2413 static int emac_wait_deps(struct emac_instance *dev)
2414 {
2415 struct emac_depentry deps[EMAC_DEP_COUNT];
2416 int i, err;
2417
2418 memset(&deps, 0, sizeof(deps));
2419
2420 deps[EMAC_DEP_MAL_IDX].phandle = dev->mal_ph;
2421 deps[EMAC_DEP_ZMII_IDX].phandle = dev->zmii_ph;
2422 deps[EMAC_DEP_RGMII_IDX].phandle = dev->rgmii_ph;
2423 if (dev->tah_ph)
2424 deps[EMAC_DEP_TAH_IDX].phandle = dev->tah_ph;
2425 if (dev->mdio_ph)
2426 deps[EMAC_DEP_MDIO_IDX].phandle = dev->mdio_ph;
2427 if (dev->blist && dev->blist > emac_boot_list)
2428 deps[EMAC_DEP_PREV_IDX].phandle = 0xffffffffu;
2429 bus_register_notifier(&platform_bus_type, &emac_of_bus_notifier);
2430 wait_event_timeout(emac_probe_wait,
2431 emac_check_deps(dev, deps),
2432 EMAC_PROBE_DEP_TIMEOUT);
2433 bus_unregister_notifier(&platform_bus_type, &emac_of_bus_notifier);
2434 err = emac_check_deps(dev, deps) ? 0 : -ENODEV;
2435 for (i = 0; i < EMAC_DEP_COUNT; i++) {
2436 of_node_put(deps[i].node);
2437 if (err)
2438 of_dev_put(deps[i].ofdev);
2439 }
2440 if (err == 0) {
2441 dev->mal_dev = deps[EMAC_DEP_MAL_IDX].ofdev;
2442 dev->zmii_dev = deps[EMAC_DEP_ZMII_IDX].ofdev;
2443 dev->rgmii_dev = deps[EMAC_DEP_RGMII_IDX].ofdev;
2444 dev->tah_dev = deps[EMAC_DEP_TAH_IDX].ofdev;
2445 dev->mdio_dev = deps[EMAC_DEP_MDIO_IDX].ofdev;
2446 }
2447 of_dev_put(deps[EMAC_DEP_PREV_IDX].ofdev);
2448 return err;
2449 }
2450
2451 static int emac_read_uint_prop(struct device_node *np, const char *name,
2452 u32 *val, int fatal)
2453 {
2454 int len;
2455 const u32 *prop = of_get_property(np, name, &len);
2456 if (prop == NULL || len < sizeof(u32)) {
2457 if (fatal)
2458 printk(KERN_ERR "%pOF: missing %s property\n",
2459 np, name);
2460 return -ENODEV;
2461 }
2462 *val = *prop;
2463 return 0;
2464 }
2465
2466 static void emac_adjust_link(struct net_device *ndev)
2467 {
2468 struct emac_instance *dev = netdev_priv(ndev);
2469 struct phy_device *phy = dev->phy_dev;
2470
2471 dev->phy.autoneg = phy->autoneg;
2472 dev->phy.speed = phy->speed;
2473 dev->phy.duplex = phy->duplex;
2474 dev->phy.pause = phy->pause;
2475 dev->phy.asym_pause = phy->asym_pause;
2476 ethtool_convert_link_mode_to_legacy_u32(&dev->phy.advertising,
2477 phy->advertising);
2478 }
2479
2480 static int emac_mii_bus_read(struct mii_bus *bus, int addr, int regnum)
2481 {
2482 int ret = emac_mdio_read(bus->priv, addr, regnum);
2483 /* This is a workaround for powered down ports/phys.
2484 * In the wild, this was seen on the Cisco Meraki MX60(W).
2485 * This hardware disables ports as part of the handoff
2486 * procedure. Accessing the ports will lead to errors
2487 * (-ETIMEDOUT, -EREMOTEIO) that do more harm than good.
2488 */
2489 return ret < 0 ? 0xffff : ret;
2490 }
2491
2492 static int emac_mii_bus_write(struct mii_bus *bus, int addr,
2493 int regnum, u16 val)
2494 {
2495 emac_mdio_write(bus->priv, addr, regnum, val);
2496 return 0;
2497 }
2498
2499 static int emac_mii_bus_reset(struct mii_bus *bus)
2500 {
2501 struct emac_instance *dev = netdev_priv(bus->priv);
2502
2503 return emac_reset(dev);
2504 }
2505
2506 static int emac_mdio_phy_start_aneg(struct mii_phy *phy,
2507 struct phy_device *phy_dev)
2508 {
2509 phy_dev->autoneg = phy->autoneg;
2510 phy_dev->speed = phy->speed;
2511 phy_dev->duplex = phy->duplex;
2512 ethtool_convert_legacy_u32_to_link_mode(phy_dev->advertising,
2513 phy->advertising);
2514 return phy_start_aneg(phy_dev);
2515 }
2516
2517 static int emac_mdio_setup_aneg(struct mii_phy *phy, u32 advertise)
2518 {
2519 struct net_device *ndev = phy->dev;
2520 struct emac_instance *dev = netdev_priv(ndev);
2521
2522 phy->autoneg = AUTONEG_ENABLE;
2523 phy->advertising = advertise;
2524 return emac_mdio_phy_start_aneg(phy, dev->phy_dev);
2525 }
2526
2527 static int emac_mdio_setup_forced(struct mii_phy *phy, int speed, int fd)
2528 {
2529 struct net_device *ndev = phy->dev;
2530 struct emac_instance *dev = netdev_priv(ndev);
2531
2532 phy->autoneg = AUTONEG_DISABLE;
2533 phy->speed = speed;
2534 phy->duplex = fd;
2535 return emac_mdio_phy_start_aneg(phy, dev->phy_dev);
2536 }
2537
2538 static int emac_mdio_poll_link(struct mii_phy *phy)
2539 {
2540 struct net_device *ndev = phy->dev;
2541 struct emac_instance *dev = netdev_priv(ndev);
2542 int res;
2543
2544 res = phy_read_status(dev->phy_dev);
2545 if (res) {
2546 dev_err(&dev->ofdev->dev, "link update failed (%d).", res);
2547 return ethtool_op_get_link(ndev);
2548 }
2549
2550 return dev->phy_dev->link;
2551 }
2552
2553 static int emac_mdio_read_link(struct mii_phy *phy)
2554 {
2555 struct net_device *ndev = phy->dev;
2556 struct emac_instance *dev = netdev_priv(ndev);
2557 struct phy_device *phy_dev = dev->phy_dev;
2558 int res;
2559
2560 res = phy_read_status(phy_dev);
2561 if (res)
2562 return res;
2563
2564 phy->speed = phy_dev->speed;
2565 phy->duplex = phy_dev->duplex;
2566 phy->pause = phy_dev->pause;
2567 phy->asym_pause = phy_dev->asym_pause;
2568 return 0;
2569 }
2570
2571 static int emac_mdio_init_phy(struct mii_phy *phy)
2572 {
2573 struct net_device *ndev = phy->dev;
2574 struct emac_instance *dev = netdev_priv(ndev);
2575
2576 phy_start(dev->phy_dev);
2577 return phy_init_hw(dev->phy_dev);
2578 }
2579
2580 static const struct mii_phy_ops emac_dt_mdio_phy_ops = {
2581 .init = emac_mdio_init_phy,
2582 .setup_aneg = emac_mdio_setup_aneg,
2583 .setup_forced = emac_mdio_setup_forced,
2584 .poll_link = emac_mdio_poll_link,
2585 .read_link = emac_mdio_read_link,
2586 };
2587
2588 static int emac_dt_mdio_probe(struct emac_instance *dev)
2589 {
2590 struct device_node *mii_np;
2591 int res;
2592
2593 mii_np = of_get_child_by_name(dev->ofdev->dev.of_node, "mdio");
2594 if (!mii_np) {
2595 dev_err(&dev->ofdev->dev, "no mdio definition found.");
2596 return -ENODEV;
2597 }
2598
2599 if (!of_device_is_available(mii_np)) {
2600 res = -ENODEV;
2601 goto put_node;
2602 }
2603
2604 dev->mii_bus = devm_mdiobus_alloc(&dev->ofdev->dev);
2605 if (!dev->mii_bus) {
2606 res = -ENOMEM;
2607 goto put_node;
2608 }
2609
2610 dev->mii_bus->priv = dev->ndev;
2611 dev->mii_bus->parent = dev->ndev->dev.parent;
2612 dev->mii_bus->name = "emac_mdio";
2613 dev->mii_bus->read = &emac_mii_bus_read;
2614 dev->mii_bus->write = &emac_mii_bus_write;
2615 dev->mii_bus->reset = &emac_mii_bus_reset;
2616 snprintf(dev->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev->ofdev->name);
2617 res = of_mdiobus_register(dev->mii_bus, mii_np);
2618 if (res) {
2619 dev_err(&dev->ofdev->dev, "cannot register MDIO bus %s (%d)",
2620 dev->mii_bus->name, res);
2621 }
2622
2623 put_node:
2624 of_node_put(mii_np);
2625 return res;
2626 }
2627
2628 static int emac_dt_phy_connect(struct emac_instance *dev,
2629 struct device_node *phy_handle)
2630 {
2631 dev->phy.def = devm_kzalloc(&dev->ofdev->dev, sizeof(*dev->phy.def),
2632 GFP_KERNEL);
2633 if (!dev->phy.def)
2634 return -ENOMEM;
2635
2636 dev->phy_dev = of_phy_connect(dev->ndev, phy_handle, &emac_adjust_link,
2637 0, dev->phy_mode);
2638 if (!dev->phy_dev) {
2639 dev_err(&dev->ofdev->dev, "failed to connect to PHY.\n");
2640 return -ENODEV;
2641 }
2642
2643 dev->phy.def->phy_id = dev->phy_dev->drv->phy_id;
2644 dev->phy.def->phy_id_mask = dev->phy_dev->drv->phy_id_mask;
2645 dev->phy.def->name = dev->phy_dev->drv->name;
2646 dev->phy.def->ops = &emac_dt_mdio_phy_ops;
2647 ethtool_convert_link_mode_to_legacy_u32(&dev->phy.features,
2648 dev->phy_dev->supported);
2649 dev->phy.address = dev->phy_dev->mdio.addr;
2650 dev->phy.mode = dev->phy_dev->interface;
2651 return 0;
2652 }
2653
2654 static int emac_dt_phy_probe(struct emac_instance *dev)
2655 {
2656 struct device_node *np = dev->ofdev->dev.of_node;
2657 struct device_node *phy_handle;
2658 int res = 1;
2659
2660 phy_handle = of_parse_phandle(np, "phy-handle", 0);
2661
2662 if (phy_handle) {
2663 res = emac_dt_mdio_probe(dev);
2664 if (!res) {
2665 res = emac_dt_phy_connect(dev, phy_handle);
2666 if (res)
2667 mdiobus_unregister(dev->mii_bus);
2668 }
2669 }
2670
2671 of_node_put(phy_handle);
2672 return res;
2673 }
2674
2675 static int emac_init_phy(struct emac_instance *dev)
2676 {
2677 struct device_node *np = dev->ofdev->dev.of_node;
2678 struct net_device *ndev = dev->ndev;
2679 u32 phy_map, adv;
2680 int i;
2681
2682 dev->phy.dev = ndev;
2683 dev->phy.mode = dev->phy_mode;
2684
2685 /* PHY-less configuration. */
2686 if ((dev->phy_address == 0xffffffff && dev->phy_map == 0xffffffff) ||
2687 of_phy_is_fixed_link(np)) {
2688 emac_reset(dev);
2689
2690 /* PHY-less configuration. */
2691 dev->phy.address = -1;
2692 dev->phy.features = SUPPORTED_MII;
2693 if (emac_phy_supports_gige(dev->phy_mode))
2694 dev->phy.features |= SUPPORTED_1000baseT_Full;
2695 else
2696 dev->phy.features |= SUPPORTED_100baseT_Full;
2697 dev->phy.pause = 1;
2698
2699 if (of_phy_is_fixed_link(np)) {
2700 int res = emac_dt_mdio_probe(dev);
2701
2702 if (res)
2703 return res;
2704
2705 res = of_phy_register_fixed_link(np);
2706 dev->phy_dev = of_phy_find_device(np);
2707 if (res || !dev->phy_dev) {
2708 mdiobus_unregister(dev->mii_bus);
2709 return res ? res : -EINVAL;
2710 }
2711 emac_adjust_link(dev->ndev);
2712 put_device(&dev->phy_dev->mdio.dev);
2713 }
2714 return 0;
2715 }
2716
2717 mutex_lock(&emac_phy_map_lock);
2718 phy_map = dev->phy_map | busy_phy_map;
2719
2720 DBG(dev, "PHY maps %08x %08x" NL, dev->phy_map, busy_phy_map);
2721
2722 dev->phy.mdio_read = emac_mdio_read;
2723 dev->phy.mdio_write = emac_mdio_write;
2724
2725 /* Enable internal clock source */
2726 #ifdef CONFIG_PPC_DCR_NATIVE
2727 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2728 dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
2729 #endif
2730 /* PHY clock workaround */
2731 emac_rx_clk_tx(dev);
2732
2733 /* Enable internal clock source on 440GX*/
2734 #ifdef CONFIG_PPC_DCR_NATIVE
2735 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2736 dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
2737 #endif
2738 /* Configure EMAC with defaults so we can at least use MDIO
2739 * This is needed mostly for 440GX
2740 */
2741 if (emac_phy_gpcs(dev->phy.mode)) {
2742 /* XXX
2743 * Make GPCS PHY address equal to EMAC index.
2744 * We probably should take into account busy_phy_map
2745 * and/or phy_map here.
2746 *
2747 * Note that the busy_phy_map is currently global
2748 * while it should probably be per-ASIC...
2749 */
2750 dev->phy.gpcs_address = dev->gpcs_address;
2751 if (dev->phy.gpcs_address == 0xffffffff)
2752 dev->phy.address = dev->cell_index;
2753 }
2754
2755 emac_configure(dev);
2756
2757 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII)) {
2758 int res = emac_dt_phy_probe(dev);
2759
2760 switch (res) {
2761 case 1:
2762 /* No phy-handle property configured.
2763 * Continue with the existing phy probe
2764 * and setup code.
2765 */
2766 break;
2767
2768 case 0:
2769 mutex_unlock(&emac_phy_map_lock);
2770 goto init_phy;
2771
2772 default:
2773 mutex_unlock(&emac_phy_map_lock);
2774 dev_err(&dev->ofdev->dev, "failed to attach dt phy (%d).\n",
2775 res);
2776 return res;
2777 }
2778 }
2779
2780 if (dev->phy_address != 0xffffffff)
2781 phy_map = ~(1 << dev->phy_address);
2782
2783 for (i = 0; i < 0x20; phy_map >>= 1, ++i)
2784 if (!(phy_map & 1)) {
2785 int r;
2786 busy_phy_map |= 1 << i;
2787
2788 /* Quick check if there is a PHY at the address */
2789 r = emac_mdio_read(dev->ndev, i, MII_BMCR);
2790 if (r == 0xffff || r < 0)
2791 continue;
2792 if (!emac_mii_phy_probe(&dev->phy, i))
2793 break;
2794 }
2795
2796 /* Enable external clock source */
2797 #ifdef CONFIG_PPC_DCR_NATIVE
2798 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2799 dcri_clrset(SDR0, SDR0_MFR, SDR0_MFR_ECS, 0);
2800 #endif
2801 mutex_unlock(&emac_phy_map_lock);
2802 if (i == 0x20) {
2803 printk(KERN_WARNING "%pOF: can't find PHY!\n", np);
2804 return -ENXIO;
2805 }
2806
2807 init_phy:
2808 /* Init PHY */
2809 if (dev->phy.def->ops->init)
2810 dev->phy.def->ops->init(&dev->phy);
2811
2812 /* Disable any PHY features not supported by the platform */
2813 dev->phy.def->features &= ~dev->phy_feat_exc;
2814 dev->phy.features &= ~dev->phy_feat_exc;
2815
2816 /* Setup initial link parameters */
2817 if (dev->phy.features & SUPPORTED_Autoneg) {
2818 adv = dev->phy.features;
2819 if (!emac_has_feature(dev, EMAC_FTR_NO_FLOW_CONTROL_40x))
2820 adv |= ADVERTISED_Pause | ADVERTISED_Asym_Pause;
2821 /* Restart autonegotiation */
2822 dev->phy.def->ops->setup_aneg(&dev->phy, adv);
2823 } else {
2824 u32 f = dev->phy.def->features;
2825 int speed = SPEED_10, fd = DUPLEX_HALF;
2826
2827 /* Select highest supported speed/duplex */
2828 if (f & SUPPORTED_1000baseT_Full) {
2829 speed = SPEED_1000;
2830 fd = DUPLEX_FULL;
2831 } else if (f & SUPPORTED_1000baseT_Half)
2832 speed = SPEED_1000;
2833 else if (f & SUPPORTED_100baseT_Full) {
2834 speed = SPEED_100;
2835 fd = DUPLEX_FULL;
2836 } else if (f & SUPPORTED_100baseT_Half)
2837 speed = SPEED_100;
2838 else if (f & SUPPORTED_10baseT_Full)
2839 fd = DUPLEX_FULL;
2840
2841 /* Force link parameters */
2842 dev->phy.def->ops->setup_forced(&dev->phy, speed, fd);
2843 }
2844 return 0;
2845 }
2846
2847 static int emac_init_config(struct emac_instance *dev)
2848 {
2849 struct device_node *np = dev->ofdev->dev.of_node;
2850 const void *p;
2851 int err;
2852
2853 /* Read config from device-tree */
2854 if (emac_read_uint_prop(np, "mal-device", &dev->mal_ph, 1))
2855 return -ENXIO;
2856 if (emac_read_uint_prop(np, "mal-tx-channel", &dev->mal_tx_chan, 1))
2857 return -ENXIO;
2858 if (emac_read_uint_prop(np, "mal-rx-channel", &dev->mal_rx_chan, 1))
2859 return -ENXIO;
2860 if (emac_read_uint_prop(np, "cell-index", &dev->cell_index, 1))
2861 return -ENXIO;
2862 if (emac_read_uint_prop(np, "max-frame-size", &dev->max_mtu, 0))
2863 dev->max_mtu = ETH_DATA_LEN;
2864 if (emac_read_uint_prop(np, "rx-fifo-size", &dev->rx_fifo_size, 0))
2865 dev->rx_fifo_size = 2048;
2866 if (emac_read_uint_prop(np, "tx-fifo-size", &dev->tx_fifo_size, 0))
2867 dev->tx_fifo_size = 2048;
2868 if (emac_read_uint_prop(np, "rx-fifo-size-gige", &dev->rx_fifo_size_gige, 0))
2869 dev->rx_fifo_size_gige = dev->rx_fifo_size;
2870 if (emac_read_uint_prop(np, "tx-fifo-size-gige", &dev->tx_fifo_size_gige, 0))
2871 dev->tx_fifo_size_gige = dev->tx_fifo_size;
2872 if (emac_read_uint_prop(np, "phy-address", &dev->phy_address, 0))
2873 dev->phy_address = 0xffffffff;
2874 if (emac_read_uint_prop(np, "phy-map", &dev->phy_map, 0))
2875 dev->phy_map = 0xffffffff;
2876 if (emac_read_uint_prop(np, "gpcs-address", &dev->gpcs_address, 0))
2877 dev->gpcs_address = 0xffffffff;
2878 if (emac_read_uint_prop(np->parent, "clock-frequency", &dev->opb_bus_freq, 1))
2879 return -ENXIO;
2880 if (emac_read_uint_prop(np, "tah-device", &dev->tah_ph, 0))
2881 dev->tah_ph = 0;
2882 if (emac_read_uint_prop(np, "tah-channel", &dev->tah_port, 0))
2883 dev->tah_port = 0;
2884 if (emac_read_uint_prop(np, "mdio-device", &dev->mdio_ph, 0))
2885 dev->mdio_ph = 0;
2886 if (emac_read_uint_prop(np, "zmii-device", &dev->zmii_ph, 0))
2887 dev->zmii_ph = 0;
2888 if (emac_read_uint_prop(np, "zmii-channel", &dev->zmii_port, 0))
2889 dev->zmii_port = 0xffffffff;
2890 if (emac_read_uint_prop(np, "rgmii-device", &dev->rgmii_ph, 0))
2891 dev->rgmii_ph = 0;
2892 if (emac_read_uint_prop(np, "rgmii-channel", &dev->rgmii_port, 0))
2893 dev->rgmii_port = 0xffffffff;
2894 if (emac_read_uint_prop(np, "fifo-entry-size", &dev->fifo_entry_size, 0))
2895 dev->fifo_entry_size = 16;
2896 if (emac_read_uint_prop(np, "mal-burst-size", &dev->mal_burst_size, 0))
2897 dev->mal_burst_size = 256;
2898
2899 /* PHY mode needs some decoding */
2900 err = of_get_phy_mode(np, &dev->phy_mode);
2901 if (err)
2902 dev->phy_mode = PHY_INTERFACE_MODE_NA;
2903
2904 /* Check EMAC version */
2905 if (of_device_is_compatible(np, "ibm,emac4sync")) {
2906 dev->features |= (EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC);
2907 if (of_device_is_compatible(np, "ibm,emac-460ex") ||
2908 of_device_is_compatible(np, "ibm,emac-460gt"))
2909 dev->features |= EMAC_FTR_460EX_PHY_CLK_FIX;
2910 if (of_device_is_compatible(np, "ibm,emac-405ex") ||
2911 of_device_is_compatible(np, "ibm,emac-405exr"))
2912 dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
2913 if (of_device_is_compatible(np, "ibm,emac-apm821xx")) {
2914 dev->features |= (EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE |
2915 EMAC_FTR_APM821XX_NO_HALF_DUPLEX |
2916 EMAC_FTR_460EX_PHY_CLK_FIX);
2917 }
2918 } else if (of_device_is_compatible(np, "ibm,emac4")) {
2919 dev->features |= EMAC_FTR_EMAC4;
2920 if (of_device_is_compatible(np, "ibm,emac-440gx"))
2921 dev->features |= EMAC_FTR_440GX_PHY_CLK_FIX;
2922 } else {
2923 if (of_device_is_compatible(np, "ibm,emac-440ep") ||
2924 of_device_is_compatible(np, "ibm,emac-440gr"))
2925 dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
2926 if (of_device_is_compatible(np, "ibm,emac-405ez")) {
2927 #ifdef CONFIG_IBM_EMAC_NO_FLOW_CTRL
2928 dev->features |= EMAC_FTR_NO_FLOW_CONTROL_40x;
2929 #else
2930 printk(KERN_ERR "%pOF: Flow control not disabled!\n",
2931 np);
2932 return -ENXIO;
2933 #endif
2934 }
2935
2936 }
2937
2938 /* Fixup some feature bits based on the device tree */
2939 if (of_get_property(np, "has-inverted-stacr-oc", NULL))
2940 dev->features |= EMAC_FTR_STACR_OC_INVERT;
2941 if (of_get_property(np, "has-new-stacr-staopc", NULL))
2942 dev->features |= EMAC_FTR_HAS_NEW_STACR;
2943
2944 /* CAB lacks the appropriate properties */
2945 if (of_device_is_compatible(np, "ibm,emac-axon"))
2946 dev->features |= EMAC_FTR_HAS_NEW_STACR |
2947 EMAC_FTR_STACR_OC_INVERT;
2948
2949 /* Enable TAH/ZMII/RGMII features as found */
2950 if (dev->tah_ph != 0) {
2951 #ifdef CONFIG_IBM_EMAC_TAH
2952 dev->features |= EMAC_FTR_HAS_TAH;
2953 #else
2954 printk(KERN_ERR "%pOF: TAH support not enabled !\n", np);
2955 return -ENXIO;
2956 #endif
2957 }
2958
2959 if (dev->zmii_ph != 0) {
2960 #ifdef CONFIG_IBM_EMAC_ZMII
2961 dev->features |= EMAC_FTR_HAS_ZMII;
2962 #else
2963 printk(KERN_ERR "%pOF: ZMII support not enabled !\n", np);
2964 return -ENXIO;
2965 #endif
2966 }
2967
2968 if (dev->rgmii_ph != 0) {
2969 #ifdef CONFIG_IBM_EMAC_RGMII
2970 dev->features |= EMAC_FTR_HAS_RGMII;
2971 #else
2972 printk(KERN_ERR "%pOF: RGMII support not enabled !\n", np);
2973 return -ENXIO;
2974 #endif
2975 }
2976
2977 /* Read MAC-address */
2978 p = of_get_property(np, "local-mac-address", NULL);
2979 if (p == NULL) {
2980 printk(KERN_ERR "%pOF: Can't find local-mac-address property\n",
2981 np);
2982 return -ENXIO;
2983 }
2984 memcpy(dev->ndev->dev_addr, p, ETH_ALEN);
2985
2986 /* IAHT and GAHT filter parameterization */
2987 if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {
2988 dev->xaht_slots_shift = EMAC4SYNC_XAHT_SLOTS_SHIFT;
2989 dev->xaht_width_shift = EMAC4SYNC_XAHT_WIDTH_SHIFT;
2990 } else {
2991 dev->xaht_slots_shift = EMAC4_XAHT_SLOTS_SHIFT;
2992 dev->xaht_width_shift = EMAC4_XAHT_WIDTH_SHIFT;
2993 }
2994
2995 /* This should never happen */
2996 if (WARN_ON(EMAC_XAHT_REGS(dev) > EMAC_XAHT_MAX_REGS))
2997 return -ENXIO;
2998
2999 DBG(dev, "features : 0x%08x / 0x%08x\n", dev->features, EMAC_FTRS_POSSIBLE);
3000 DBG(dev, "tx_fifo_size : %d (%d gige)\n", dev->tx_fifo_size, dev->tx_fifo_size_gige);
3001 DBG(dev, "rx_fifo_size : %d (%d gige)\n", dev->rx_fifo_size, dev->rx_fifo_size_gige);
3002 DBG(dev, "max_mtu : %d\n", dev->max_mtu);
3003 DBG(dev, "OPB freq : %d\n", dev->opb_bus_freq);
3004
3005 return 0;
3006 }
3007
3008 static const struct net_device_ops emac_netdev_ops = {
3009 .ndo_open = emac_open,
3010 .ndo_stop = emac_close,
3011 .ndo_get_stats = emac_stats,
3012 .ndo_set_rx_mode = emac_set_multicast_list,
3013 .ndo_do_ioctl = emac_ioctl,
3014 .ndo_tx_timeout = emac_tx_timeout,
3015 .ndo_validate_addr = eth_validate_addr,
3016 .ndo_set_mac_address = emac_set_mac_address,
3017 .ndo_start_xmit = emac_start_xmit,
3018 };
3019
3020 static const struct net_device_ops emac_gige_netdev_ops = {
3021 .ndo_open = emac_open,
3022 .ndo_stop = emac_close,
3023 .ndo_get_stats = emac_stats,
3024 .ndo_set_rx_mode = emac_set_multicast_list,
3025 .ndo_do_ioctl = emac_ioctl,
3026 .ndo_tx_timeout = emac_tx_timeout,
3027 .ndo_validate_addr = eth_validate_addr,
3028 .ndo_set_mac_address = emac_set_mac_address,
3029 .ndo_start_xmit = emac_start_xmit_sg,
3030 .ndo_change_mtu = emac_change_mtu,
3031 };
3032
3033 static int emac_probe(struct platform_device *ofdev)
3034 {
3035 struct net_device *ndev;
3036 struct emac_instance *dev;
3037 struct device_node *np = ofdev->dev.of_node;
3038 struct device_node **blist = NULL;
3039 int err, i;
3040
3041 /* Skip unused/unwired EMACS. We leave the check for an unused
3042 * property here for now, but new flat device trees should set a
3043 * status property to "disabled" instead.
3044 */
3045 if (of_get_property(np, "unused", NULL) || !of_device_is_available(np))
3046 return -ENODEV;
3047
3048 /* Find ourselves in the bootlist if we are there */
3049 for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
3050 if (emac_boot_list[i] == np)
3051 blist = &emac_boot_list[i];
3052
3053 /* Allocate our net_device structure */
3054 err = -ENOMEM;
3055 ndev = alloc_etherdev(sizeof(struct emac_instance));
3056 if (!ndev)
3057 goto err_gone;
3058
3059 dev = netdev_priv(ndev);
3060 dev->ndev = ndev;
3061 dev->ofdev = ofdev;
3062 dev->blist = blist;
3063 SET_NETDEV_DEV(ndev, &ofdev->dev);
3064
3065 /* Initialize some embedded data structures */
3066 mutex_init(&dev->mdio_lock);
3067 mutex_init(&dev->link_lock);
3068 spin_lock_init(&dev->lock);
3069 INIT_WORK(&dev->reset_work, emac_reset_work);
3070
3071 /* Init various config data based on device-tree */
3072 err = emac_init_config(dev);
3073 if (err)
3074 goto err_free;
3075
3076 /* Get interrupts. EMAC irq is mandatory, WOL irq is optional */
3077 dev->emac_irq = irq_of_parse_and_map(np, 0);
3078 dev->wol_irq = irq_of_parse_and_map(np, 1);
3079 if (!dev->emac_irq) {
3080 printk(KERN_ERR "%pOF: Can't map main interrupt\n", np);
3081 err = -ENODEV;
3082 goto err_free;
3083 }
3084 ndev->irq = dev->emac_irq;
3085
3086 /* Map EMAC regs */
3087 // TODO : platform_get_resource() and devm_ioremap_resource()
3088 dev->emacp = of_iomap(np, 0);
3089 if (dev->emacp == NULL) {
3090 printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
3091 err = -ENOMEM;
3092 goto err_irq_unmap;
3093 }
3094
3095 /* Wait for dependent devices */
3096 err = emac_wait_deps(dev);
3097 if (err) {
3098 printk(KERN_ERR
3099 "%pOF: Timeout waiting for dependent devices\n", np);
3100 /* display more info about what's missing ? */
3101 goto err_reg_unmap;
3102 }
3103 dev->mal = platform_get_drvdata(dev->mal_dev);
3104 if (dev->mdio_dev != NULL)
3105 dev->mdio_instance = platform_get_drvdata(dev->mdio_dev);
3106
3107 /* Register with MAL */
3108 dev->commac.ops = &emac_commac_ops;
3109 dev->commac.dev = dev;
3110 dev->commac.tx_chan_mask = MAL_CHAN_MASK(dev->mal_tx_chan);
3111 dev->commac.rx_chan_mask = MAL_CHAN_MASK(dev->mal_rx_chan);
3112 err = mal_register_commac(dev->mal, &dev->commac);
3113 if (err) {
3114 printk(KERN_ERR "%pOF: failed to register with mal %pOF!\n",
3115 np, dev->mal_dev->dev.of_node);
3116 goto err_rel_deps;
3117 }
3118 dev->rx_skb_size = emac_rx_skb_size(ndev->mtu);
3119 dev->rx_sync_size = emac_rx_sync_size(ndev->mtu);
3120
3121 /* Get pointers to BD rings */
3122 dev->tx_desc =
3123 dev->mal->bd_virt + mal_tx_bd_offset(dev->mal, dev->mal_tx_chan);
3124 dev->rx_desc =
3125 dev->mal->bd_virt + mal_rx_bd_offset(dev->mal, dev->mal_rx_chan);
3126
3127 DBG(dev, "tx_desc %p" NL, dev->tx_desc);
3128 DBG(dev, "rx_desc %p" NL, dev->rx_desc);
3129
3130 /* Clean rings */
3131 memset(dev->tx_desc, 0, NUM_TX_BUFF * sizeof(struct mal_descriptor));
3132 memset(dev->rx_desc, 0, NUM_RX_BUFF * sizeof(struct mal_descriptor));
3133 memset(dev->tx_skb, 0, NUM_TX_BUFF * sizeof(struct sk_buff *));
3134 memset(dev->rx_skb, 0, NUM_RX_BUFF * sizeof(struct sk_buff *));
3135
3136 /* Attach to ZMII, if needed */
3137 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII) &&
3138 (err = zmii_attach(dev->zmii_dev, dev->zmii_port, &dev->phy_mode)) != 0)
3139 goto err_unreg_commac;
3140
3141 /* Attach to RGMII, if needed */
3142 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII) &&
3143 (err = rgmii_attach(dev->rgmii_dev, dev->rgmii_port, dev->phy_mode)) != 0)
3144 goto err_detach_zmii;
3145
3146 /* Attach to TAH, if needed */
3147 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH) &&
3148 (err = tah_attach(dev->tah_dev, dev->tah_port)) != 0)
3149 goto err_detach_rgmii;
3150
3151 /* Set some link defaults before we can find out real parameters */
3152 dev->phy.speed = SPEED_100;
3153 dev->phy.duplex = DUPLEX_FULL;
3154 dev->phy.autoneg = AUTONEG_DISABLE;
3155 dev->phy.pause = dev->phy.asym_pause = 0;
3156 dev->stop_timeout = STOP_TIMEOUT_100;
3157 INIT_DELAYED_WORK(&dev->link_work, emac_link_timer);
3158
3159 /* Some SoCs like APM821xx does not support Half Duplex mode. */
3160 if (emac_has_feature(dev, EMAC_FTR_APM821XX_NO_HALF_DUPLEX)) {
3161 dev->phy_feat_exc = (SUPPORTED_1000baseT_Half |
3162 SUPPORTED_100baseT_Half |
3163 SUPPORTED_10baseT_Half);
3164 }
3165
3166 /* Find PHY if any */
3167 err = emac_init_phy(dev);
3168 if (err != 0)
3169 goto err_detach_tah;
3170
3171 if (dev->tah_dev) {
3172 ndev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG;
3173 ndev->features |= ndev->hw_features | NETIF_F_RXCSUM;
3174 }
3175 ndev->watchdog_timeo = 5 * HZ;
3176 if (emac_phy_supports_gige(dev->phy_mode)) {
3177 ndev->netdev_ops = &emac_gige_netdev_ops;
3178 dev->commac.ops = &emac_commac_sg_ops;
3179 } else
3180 ndev->netdev_ops = &emac_netdev_ops;
3181 ndev->ethtool_ops = &emac_ethtool_ops;
3182
3183 /* MTU range: 46 - 1500 or whatever is in OF */
3184 ndev->min_mtu = EMAC_MIN_MTU;
3185 ndev->max_mtu = dev->max_mtu;
3186
3187 netif_carrier_off(ndev);
3188
3189 err = register_netdev(ndev);
3190 if (err) {
3191 printk(KERN_ERR "%pOF: failed to register net device (%d)!\n",
3192 np, err);
3193 goto err_detach_tah;
3194 }
3195
3196 /* Set our drvdata last as we don't want them visible until we are
3197 * fully initialized
3198 */
3199 wmb();
3200 platform_set_drvdata(ofdev, dev);
3201
3202 /* There's a new kid in town ! Let's tell everybody */
3203 wake_up_all(&emac_probe_wait);
3204
3205
3206 printk(KERN_INFO "%s: EMAC-%d %pOF, MAC %pM\n",
3207 ndev->name, dev->cell_index, np, ndev->dev_addr);
3208
3209 if (dev->phy_mode == PHY_INTERFACE_MODE_SGMII)
3210 printk(KERN_NOTICE "%s: in SGMII mode\n", ndev->name);
3211
3212 if (dev->phy.address >= 0)
3213 printk("%s: found %s PHY (0x%02x)\n", ndev->name,
3214 dev->phy.def->name, dev->phy.address);
3215
3216 /* Life is good */
3217 return 0;
3218
3219 /* I have a bad feeling about this ... */
3220
3221 err_detach_tah:
3222 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
3223 tah_detach(dev->tah_dev, dev->tah_port);
3224 err_detach_rgmii:
3225 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
3226 rgmii_detach(dev->rgmii_dev, dev->rgmii_port);
3227 err_detach_zmii:
3228 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
3229 zmii_detach(dev->zmii_dev, dev->zmii_port);
3230 err_unreg_commac:
3231 mal_unregister_commac(dev->mal, &dev->commac);
3232 err_rel_deps:
3233 emac_put_deps(dev);
3234 err_reg_unmap:
3235 iounmap(dev->emacp);
3236 err_irq_unmap:
3237 if (dev->wol_irq)
3238 irq_dispose_mapping(dev->wol_irq);
3239 if (dev->emac_irq)
3240 irq_dispose_mapping(dev->emac_irq);
3241 err_free:
3242 free_netdev(ndev);
3243 err_gone:
3244 /* if we were on the bootlist, remove us as we won't show up and
3245 * wake up all waiters to notify them in case they were waiting
3246 * on us
3247 */
3248 if (blist) {
3249 *blist = NULL;
3250 wake_up_all(&emac_probe_wait);
3251 }
3252 return err;
3253 }
3254
3255 static int emac_remove(struct platform_device *ofdev)
3256 {
3257 struct emac_instance *dev = platform_get_drvdata(ofdev);
3258
3259 DBG(dev, "remove" NL);
3260
3261 unregister_netdev(dev->ndev);
3262
3263 cancel_work_sync(&dev->reset_work);
3264
3265 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
3266 tah_detach(dev->tah_dev, dev->tah_port);
3267 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
3268 rgmii_detach(dev->rgmii_dev, dev->rgmii_port);
3269 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
3270 zmii_detach(dev->zmii_dev, dev->zmii_port);
3271
3272 if (dev->phy_dev)
3273 phy_disconnect(dev->phy_dev);
3274
3275 if (dev->mii_bus)
3276 mdiobus_unregister(dev->mii_bus);
3277
3278 busy_phy_map &= ~(1 << dev->phy.address);
3279 DBG(dev, "busy_phy_map now %#x" NL, busy_phy_map);
3280
3281 mal_unregister_commac(dev->mal, &dev->commac);
3282 emac_put_deps(dev);
3283
3284 iounmap(dev->emacp);
3285
3286 if (dev->wol_irq)
3287 irq_dispose_mapping(dev->wol_irq);
3288 if (dev->emac_irq)
3289 irq_dispose_mapping(dev->emac_irq);
3290
3291 free_netdev(dev->ndev);
3292
3293 return 0;
3294 }
3295
3296 /* XXX Features in here should be replaced by properties... */
3297 static const struct of_device_id emac_match[] =
3298 {
3299 {
3300 .type = "network",
3301 .compatible = "ibm,emac",
3302 },
3303 {
3304 .type = "network",
3305 .compatible = "ibm,emac4",
3306 },
3307 {
3308 .type = "network",
3309 .compatible = "ibm,emac4sync",
3310 },
3311 {},
3312 };
3313 MODULE_DEVICE_TABLE(of, emac_match);
3314
3315 static struct platform_driver emac_driver = {
3316 .driver = {
3317 .name = "emac",
3318 .of_match_table = emac_match,
3319 },
3320 .probe = emac_probe,
3321 .remove = emac_remove,
3322 };
3323
3324 static void __init emac_make_bootlist(void)
3325 {
3326 struct device_node *np = NULL;
3327 int j, max, i = 0;
3328 int cell_indices[EMAC_BOOT_LIST_SIZE];
3329
3330 /* Collect EMACs */
3331 while((np = of_find_all_nodes(np)) != NULL) {
3332 const u32 *idx;
3333
3334 if (of_match_node(emac_match, np) == NULL)
3335 continue;
3336 if (of_get_property(np, "unused", NULL))
3337 continue;
3338 idx = of_get_property(np, "cell-index", NULL);
3339 if (idx == NULL)
3340 continue;
3341 cell_indices[i] = *idx;
3342 emac_boot_list[i++] = of_node_get(np);
3343 if (i >= EMAC_BOOT_LIST_SIZE) {
3344 of_node_put(np);
3345 break;
3346 }
3347 }
3348 max = i;
3349
3350 /* Bubble sort them (doh, what a creative algorithm :-) */
3351 for (i = 0; max > 1 && (i < (max - 1)); i++)
3352 for (j = i; j < max; j++) {
3353 if (cell_indices[i] > cell_indices[j]) {
3354 swap(emac_boot_list[i], emac_boot_list[j]);
3355 swap(cell_indices[i], cell_indices[j]);
3356 }
3357 }
3358 }
3359
3360 static int __init emac_init(void)
3361 {
3362 int rc;
3363
3364 printk(KERN_INFO DRV_DESC ", version " DRV_VERSION "\n");
3365
3366 /* Build EMAC boot list */
3367 emac_make_bootlist();
3368
3369 /* Init submodules */
3370 rc = mal_init();
3371 if (rc)
3372 goto err;
3373 rc = zmii_init();
3374 if (rc)
3375 goto err_mal;
3376 rc = rgmii_init();
3377 if (rc)
3378 goto err_zmii;
3379 rc = tah_init();
3380 if (rc)
3381 goto err_rgmii;
3382 rc = platform_driver_register(&emac_driver);
3383 if (rc)
3384 goto err_tah;
3385
3386 return 0;
3387
3388 err_tah:
3389 tah_exit();
3390 err_rgmii:
3391 rgmii_exit();
3392 err_zmii:
3393 zmii_exit();
3394 err_mal:
3395 mal_exit();
3396 err:
3397 return rc;
3398 }
3399
3400 static void __exit emac_exit(void)
3401 {
3402 int i;
3403
3404 platform_driver_unregister(&emac_driver);
3405
3406 tah_exit();
3407 rgmii_exit();
3408 zmii_exit();
3409 mal_exit();
3410
3411 /* Destroy EMAC boot list */
3412 for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
3413 of_node_put(emac_boot_list[i]);
3414 }
3415
3416 module_init(emac_init);
3417 module_exit(emac_exit);
Linux with added FPC-III support