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