1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * drivers/net/ethernet/ibm/emac/core.c
4 *
5 * Driver for PowerPC 4xx on-chip ethernet controller.
6 *
7 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
8 * <benh@kernel.crashing.org>
9 *
10 * Based on the arch/ppc version of the driver:
11 *
12 * Copyright (c) 2004, 2005 Zultys Technologies.
13 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
14 *
15 * Based on original work by
16 * Matt Porter <mporter@kernel.crashing.org>
17 * (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
18 * Armin Kuster <akuster@mvista.com>
19 * Johnnie Peters <jpeters@mvista.com>
20 */
21
22 #include <linux/module.h>
23 #include <linux/sched.h>
24 #include <linux/string.h>
25 #include <linux/errno.h>
26 #include <linux/delay.h>
27 #include <linux/types.h>
28 #include <linux/pci.h>
29 #include <linux/etherdevice.h>
30 #include <linux/skbuff.h>
31 #include <linux/crc32.h>
32 #include <linux/ethtool.h>
33 #include <linux/mii.h>
34 #include <linux/bitops.h>
35 #include <linux/workqueue.h>
36 #include <linux/of.h>
37 #include <linux/of_address.h>
38 #include <linux/of_irq.h>
39 #include <linux/of_net.h>
40 #include <linux/of_mdio.h>
41 #include <linux/of_platform.h>
42 #include <linux/platform_device.h>
43 #include <linux/slab.h>
44
45 #include <asm/processor.h>
46 #include <asm/io.h>
47 #include <asm/dma.h>
48 #include <linux/uaccess.h>
49 #include <asm/dcr.h>
50 #include <asm/dcr-regs.h>
51
52 #include "core.h"
53
54 /*
55 * Lack of dma_unmap_???? calls is intentional.
56 *
57 * API-correct usage requires additional support state information to be
58 * maintained for every RX and TX buffer descriptor (BD). Unfortunately, due to
59 * EMAC design (e.g. TX buffer passed from network stack can be split into
60 * several BDs, dma_map_single/dma_map_page can be used to map particular BD),
61 * maintaining such information will add additional overhead.
62 * Current DMA API implementation for 4xx processors only ensures cache coherency
63 * and dma_unmap_???? routines are empty and are likely to stay this way.
64 * I decided to omit dma_unmap_??? calls because I don't want to add additional
65 * complexity just for the sake of following some abstract API, when it doesn't
66 * add any real benefit to the driver. I understand that this decision maybe
67 * controversial, but I really tried to make code API-correct and efficient
68 * at the same time and didn't come up with code I liked :(. --ebs
69 */
70
71 #define DRV_NAME "emac"
72 #define DRV_VERSION "3.54"
73 #define DRV_DESC "PPC 4xx OCP EMAC driver"
74
75 MODULE_DESCRIPTION(DRV_DESC);
76 MODULE_AUTHOR
77 ("Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>");
78 MODULE_LICENSE("GPL");
79
80 /* minimum number of free TX descriptors required to wake up TX process */
81 #define EMAC_TX_WAKEUP_THRESH (NUM_TX_BUFF / 4)
82
83 /* If packet size is less than this number, we allocate small skb and copy packet
84 * contents into it instead of just sending original big skb up
85 */
86 #define EMAC_RX_COPY_THRESH CONFIG_IBM_EMAC_RX_COPY_THRESHOLD
87
88 /* Since multiple EMACs share MDIO lines in various ways, we need
89 * to avoid re-using the same PHY ID in cases where the arch didn't
90 * setup precise phy_map entries
91 *
92 * XXX This is something that needs to be reworked as we can have multiple
93 * EMAC "sets" (multiple ASICs containing several EMACs) though we can
94 * probably require in that case to have explicit PHY IDs in the device-tree
95 */
96 static u32 busy_phy_map;
97 static DEFINE_MUTEX(emac_phy_map_lock);
98
99 /* This is the wait queue used to wait on any event related to probe, that
100 * is discovery of MALs, other EMACs, ZMII/RGMIIs, etc...
101 */
102 static DECLARE_WAIT_QUEUE_HEAD(emac_probe_wait);
103
104 /* Having stable interface names is a doomed idea. However, it would be nice
105 * if we didn't have completely random interface names at boot too :-) It's
106 * just a matter of making everybody's life easier. Since we are doing
107 * threaded probing, it's a bit harder though. The base idea here is that
108 * we make up a list of all emacs in the device-tree before we register the
109 * driver. Every emac will then wait for the previous one in the list to
110 * initialize before itself. We should also keep that list ordered by
111 * cell_index.
112 * That list is only 4 entries long, meaning that additional EMACs don't
113 * get ordering guarantees unless EMAC_BOOT_LIST_SIZE is increased.
114 */
115
116 #define EMAC_BOOT_LIST_SIZE 4
117 static struct device_node *emac_boot_list[EMAC_BOOT_LIST_SIZE];
118
119 /* How long should I wait for dependent devices ? */
120 #define EMAC_PROBE_DEP_TIMEOUT (HZ * 5)
121
122 /* I don't want to litter system log with timeout errors
123 * when we have brain-damaged PHY.
124 */
emac_report_timeout_error(struct emac_instance * dev,const char * error)125 static inline void emac_report_timeout_error(struct emac_instance *dev,
126 const char *error)
127 {
128 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX |
129 EMAC_FTR_460EX_PHY_CLK_FIX |
130 EMAC_FTR_440EP_PHY_CLK_FIX))
131 DBG(dev, "%s" NL, error);
132 else if (net_ratelimit())
133 printk(KERN_ERR "%pOF: %s\n", dev->ofdev->dev.of_node, error);
134 }
135
136 /* EMAC PHY clock workaround:
137 * 440EP/440GR has more sane SDR0_MFR register implementation than 440GX,
138 * which allows controlling each EMAC clock
139 */
emac_rx_clk_tx(struct emac_instance * dev)140 static inline void emac_rx_clk_tx(struct emac_instance *dev)
141 {
142 #ifdef CONFIG_PPC_DCR_NATIVE
143 if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
144 dcri_clrset(SDR0, SDR0_MFR,
145 0, SDR0_MFR_ECS >> dev->cell_index);
146 #endif
147 }
148
emac_rx_clk_default(struct emac_instance * dev)149 static inline void emac_rx_clk_default(struct emac_instance *dev)
150 {
151 #ifdef CONFIG_PPC_DCR_NATIVE
152 if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
153 dcri_clrset(SDR0, SDR0_MFR,
154 SDR0_MFR_ECS >> dev->cell_index, 0);
155 #endif
156 }
157
158 /* PHY polling intervals */
159 #define PHY_POLL_LINK_ON HZ
160 #define PHY_POLL_LINK_OFF (HZ / 5)
161
162 /* Graceful stop timeouts in us.
163 * We should allow up to 1 frame time (full-duplex, ignoring collisions)
164 */
165 #define STOP_TIMEOUT_10 1230
166 #define STOP_TIMEOUT_100 124
167 #define STOP_TIMEOUT_1000 13
168 #define STOP_TIMEOUT_1000_JUMBO 73
169
170 static unsigned char default_mcast_addr[] = {
171 0x01, 0x80, 0xC2, 0x00, 0x00, 0x01
172 };
173
174 /* Please, keep in sync with struct ibm_emac_stats/ibm_emac_error_stats */
175 static const char emac_stats_keys[EMAC_ETHTOOL_STATS_COUNT][ETH_GSTRING_LEN] = {
176 "rx_packets", "rx_bytes", "tx_packets", "tx_bytes", "rx_packets_csum",
177 "tx_packets_csum", "tx_undo", "rx_dropped_stack", "rx_dropped_oom",
178 "rx_dropped_error", "rx_dropped_resize", "rx_dropped_mtu",
179 "rx_stopped", "rx_bd_errors", "rx_bd_overrun", "rx_bd_bad_packet",
180 "rx_bd_runt_packet", "rx_bd_short_event", "rx_bd_alignment_error",
181 "rx_bd_bad_fcs", "rx_bd_packet_too_long", "rx_bd_out_of_range",
182 "rx_bd_in_range", "rx_parity", "rx_fifo_overrun", "rx_overrun",
183 "rx_bad_packet", "rx_runt_packet", "rx_short_event",
184 "rx_alignment_error", "rx_bad_fcs", "rx_packet_too_long",
185 "rx_out_of_range", "rx_in_range", "tx_dropped", "tx_bd_errors",
186 "tx_bd_bad_fcs", "tx_bd_carrier_loss", "tx_bd_excessive_deferral",
187 "tx_bd_excessive_collisions", "tx_bd_late_collision",
188 "tx_bd_multple_collisions", "tx_bd_single_collision",
189 "tx_bd_underrun", "tx_bd_sqe", "tx_parity", "tx_underrun", "tx_sqe",
190 "tx_errors"
191 };
192
193 static irqreturn_t emac_irq(int irq, void *dev_instance);
194 static void emac_clean_tx_ring(struct emac_instance *dev);
195 static void __emac_set_multicast_list(struct emac_instance *dev);
196
emac_phy_supports_gige(int phy_mode)197 static inline int emac_phy_supports_gige(int phy_mode)
198 {
199 return phy_interface_mode_is_rgmii(phy_mode) ||
200 phy_mode == PHY_INTERFACE_MODE_GMII ||
201 phy_mode == PHY_INTERFACE_MODE_SGMII ||
202 phy_mode == PHY_INTERFACE_MODE_TBI ||
203 phy_mode == PHY_INTERFACE_MODE_RTBI;
204 }
205
emac_phy_gpcs(int phy_mode)206 static inline int emac_phy_gpcs(int phy_mode)
207 {
208 return phy_mode == PHY_INTERFACE_MODE_SGMII ||
209 phy_mode == PHY_INTERFACE_MODE_TBI ||
210 phy_mode == PHY_INTERFACE_MODE_RTBI;
211 }
212
emac_tx_enable(struct emac_instance * dev)213 static inline void emac_tx_enable(struct emac_instance *dev)
214 {
215 struct emac_regs __iomem *p = dev->emacp;
216 u32 r;
217
218 DBG(dev, "tx_enable" NL);
219
220 r = in_be32(&p->mr0);
221 if (!(r & EMAC_MR0_TXE))
222 out_be32(&p->mr0, r | EMAC_MR0_TXE);
223 }
224
emac_tx_disable(struct emac_instance * dev)225 static void emac_tx_disable(struct emac_instance *dev)
226 {
227 struct emac_regs __iomem *p = dev->emacp;
228 u32 r;
229
230 DBG(dev, "tx_disable" NL);
231
232 r = in_be32(&p->mr0);
233 if (r & EMAC_MR0_TXE) {
234 int n = dev->stop_timeout;
235 out_be32(&p->mr0, r & ~EMAC_MR0_TXE);
236 while (!(in_be32(&p->mr0) & EMAC_MR0_TXI) && n) {
237 udelay(1);
238 --n;
239 }
240 if (unlikely(!n))
241 emac_report_timeout_error(dev, "TX disable timeout");
242 }
243 }
244
emac_rx_enable(struct emac_instance * dev)245 static void emac_rx_enable(struct emac_instance *dev)
246 {
247 struct emac_regs __iomem *p = dev->emacp;
248 u32 r;
249
250 if (unlikely(test_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags)))
251 goto out;
252
253 DBG(dev, "rx_enable" NL);
254
255 r = in_be32(&p->mr0);
256 if (!(r & EMAC_MR0_RXE)) {
257 if (unlikely(!(r & EMAC_MR0_RXI))) {
258 /* Wait if previous async disable is still in progress */
259 int n = dev->stop_timeout;
260 while (!(r = in_be32(&p->mr0) & EMAC_MR0_RXI) && n) {
261 udelay(1);
262 --n;
263 }
264 if (unlikely(!n))
265 emac_report_timeout_error(dev,
266 "RX disable timeout");
267 }
268 out_be32(&p->mr0, r | EMAC_MR0_RXE);
269 }
270 out:
271 ;
272 }
273
emac_rx_disable(struct emac_instance * dev)274 static void emac_rx_disable(struct emac_instance *dev)
275 {
276 struct emac_regs __iomem *p = dev->emacp;
277 u32 r;
278
279 DBG(dev, "rx_disable" NL);
280
281 r = in_be32(&p->mr0);
282 if (r & EMAC_MR0_RXE) {
283 int n = dev->stop_timeout;
284 out_be32(&p->mr0, r & ~EMAC_MR0_RXE);
285 while (!(in_be32(&p->mr0) & EMAC_MR0_RXI) && n) {
286 udelay(1);
287 --n;
288 }
289 if (unlikely(!n))
290 emac_report_timeout_error(dev, "RX disable timeout");
291 }
292 }
293
emac_netif_stop(struct emac_instance * dev)294 static inline void emac_netif_stop(struct emac_instance *dev)
295 {
296 netif_tx_lock_bh(dev->ndev);
297 netif_addr_lock(dev->ndev);
298 dev->no_mcast = 1;
299 netif_addr_unlock(dev->ndev);
300 netif_tx_unlock_bh(dev->ndev);
301 netif_trans_update(dev->ndev); /* prevent tx timeout */
302 mal_poll_disable(dev->mal, &dev->commac);
303 netif_tx_disable(dev->ndev);
304 }
305
emac_netif_start(struct emac_instance * dev)306 static inline void emac_netif_start(struct emac_instance *dev)
307 {
308 netif_tx_lock_bh(dev->ndev);
309 netif_addr_lock(dev->ndev);
310 dev->no_mcast = 0;
311 if (dev->mcast_pending && netif_running(dev->ndev))
312 __emac_set_multicast_list(dev);
313 netif_addr_unlock(dev->ndev);
314 netif_tx_unlock_bh(dev->ndev);
315
316 netif_wake_queue(dev->ndev);
317
318 /* NOTE: unconditional netif_wake_queue is only appropriate
319 * so long as all callers are assured to have free tx slots
320 * (taken from tg3... though the case where that is wrong is
321 * not terribly harmful)
322 */
323 mal_poll_enable(dev->mal, &dev->commac);
324 }
325
emac_rx_disable_async(struct emac_instance * dev)326 static inline void emac_rx_disable_async(struct emac_instance *dev)
327 {
328 struct emac_regs __iomem *p = dev->emacp;
329 u32 r;
330
331 DBG(dev, "rx_disable_async" NL);
332
333 r = in_be32(&p->mr0);
334 if (r & EMAC_MR0_RXE)
335 out_be32(&p->mr0, r & ~EMAC_MR0_RXE);
336 }
337
emac_reset(struct emac_instance * dev)338 static int emac_reset(struct emac_instance *dev)
339 {
340 struct emac_regs __iomem *p = dev->emacp;
341 int n = 20;
342 bool __maybe_unused try_internal_clock = false;
343
344 DBG(dev, "reset" NL);
345
346 if (!dev->reset_failed) {
347 /* 40x erratum suggests stopping RX channel before reset,
348 * we stop TX as well
349 */
350 emac_rx_disable(dev);
351 emac_tx_disable(dev);
352 }
353
354 #ifdef CONFIG_PPC_DCR_NATIVE
355 do_retry:
356 /*
357 * PPC460EX/GT Embedded Processor Advanced User's Manual
358 * section 28.10.1 Mode Register 0 (EMACx_MR0) states:
359 * Note: The PHY must provide a TX Clk in order to perform a soft reset
360 * of the EMAC. If none is present, select the internal clock
361 * (SDR0_ETH_CFG[EMACx_PHY_CLK] = 1).
362 * After a soft reset, select the external clock.
363 *
364 * The AR8035-A PHY Meraki MR24 does not provide a TX Clk if the
365 * ethernet cable is not attached. This causes the reset to timeout
366 * and the PHY detection code in emac_init_phy() is unable to
367 * communicate and detect the AR8035-A PHY. As a result, the emac
368 * driver bails out early and the user has no ethernet.
369 * In order to stay compatible with existing configurations, the
370 * driver will temporarily switch to the internal clock, after
371 * the first reset fails.
372 */
373 if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX)) {
374 if (try_internal_clock || (dev->phy_address == 0xffffffff &&
375 dev->phy_map == 0xffffffff)) {
376 /* No PHY: select internal loop clock before reset */
377 dcri_clrset(SDR0, SDR0_ETH_CFG,
378 0, SDR0_ETH_CFG_ECS << dev->cell_index);
379 } else {
380 /* PHY present: select external clock before reset */
381 dcri_clrset(SDR0, SDR0_ETH_CFG,
382 SDR0_ETH_CFG_ECS << dev->cell_index, 0);
383 }
384 }
385 #endif
386
387 out_be32(&p->mr0, EMAC_MR0_SRST);
388 while ((in_be32(&p->mr0) & EMAC_MR0_SRST) && n)
389 --n;
390
391 #ifdef CONFIG_PPC_DCR_NATIVE
392 if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX)) {
393 if (!n && !try_internal_clock) {
394 /* first attempt has timed out. */
395 n = 20;
396 try_internal_clock = true;
397 goto do_retry;
398 }
399
400 if (try_internal_clock || (dev->phy_address == 0xffffffff &&
401 dev->phy_map == 0xffffffff)) {
402 /* No PHY: restore external clock source after reset */
403 dcri_clrset(SDR0, SDR0_ETH_CFG,
404 SDR0_ETH_CFG_ECS << dev->cell_index, 0);
405 }
406 }
407 #endif
408
409 if (n) {
410 dev->reset_failed = 0;
411 return 0;
412 } else {
413 emac_report_timeout_error(dev, "reset timeout");
414 dev->reset_failed = 1;
415 return -ETIMEDOUT;
416 }
417 }
418
emac_hash_mc(struct emac_instance * dev)419 static void emac_hash_mc(struct emac_instance *dev)
420 {
421 const int regs = EMAC_XAHT_REGS(dev);
422 u32 *gaht_base = emac_gaht_base(dev);
423 u32 gaht_temp[EMAC_XAHT_MAX_REGS];
424 struct netdev_hw_addr *ha;
425 int i;
426
427 DBG(dev, "hash_mc %d" NL, netdev_mc_count(dev->ndev));
428
429 memset(gaht_temp, 0, sizeof (gaht_temp));
430
431 netdev_for_each_mc_addr(ha, dev->ndev) {
432 int slot, reg, mask;
433 DBG2(dev, "mc %pM" NL, ha->addr);
434
435 slot = EMAC_XAHT_CRC_TO_SLOT(dev,
436 ether_crc(ETH_ALEN, ha->addr));
437 reg = EMAC_XAHT_SLOT_TO_REG(dev, slot);
438 mask = EMAC_XAHT_SLOT_TO_MASK(dev, slot);
439
440 gaht_temp[reg] |= mask;
441 }
442
443 for (i = 0; i < regs; i++)
444 out_be32(gaht_base + i, gaht_temp[i]);
445 }
446
emac_iff2rmr(struct net_device * ndev)447 static inline u32 emac_iff2rmr(struct net_device *ndev)
448 {
449 struct emac_instance *dev = netdev_priv(ndev);
450 u32 r;
451
452 r = EMAC_RMR_SP | EMAC_RMR_SFCS | EMAC_RMR_IAE | EMAC_RMR_BAE;
453
454 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
455 r |= EMAC4_RMR_BASE;
456 else
457 r |= EMAC_RMR_BASE;
458
459 if (ndev->flags & IFF_PROMISC)
460 r |= EMAC_RMR_PME;
461 else if (ndev->flags & IFF_ALLMULTI ||
462 (netdev_mc_count(ndev) > EMAC_XAHT_SLOTS(dev)))
463 r |= EMAC_RMR_PMME;
464 else if (!netdev_mc_empty(ndev))
465 r |= EMAC_RMR_MAE;
466
467 if (emac_has_feature(dev, EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE)) {
468 r &= ~EMAC4_RMR_MJS_MASK;
469 r |= EMAC4_RMR_MJS(ndev->mtu);
470 }
471
472 return r;
473 }
474
__emac_calc_base_mr1(struct emac_instance * dev,int tx_size,int rx_size)475 static u32 __emac_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_size)
476 {
477 u32 ret = EMAC_MR1_VLE | EMAC_MR1_IST | EMAC_MR1_TR0_MULT;
478
479 DBG2(dev, "__emac_calc_base_mr1" NL);
480
481 switch(tx_size) {
482 case 2048:
483 ret |= EMAC_MR1_TFS_2K;
484 break;
485 default:
486 printk(KERN_WARNING "%s: Unknown Tx FIFO size %d\n",
487 dev->ndev->name, tx_size);
488 }
489
490 switch(rx_size) {
491 case 16384:
492 ret |= EMAC_MR1_RFS_16K;
493 break;
494 case 4096:
495 ret |= EMAC_MR1_RFS_4K;
496 break;
497 default:
498 printk(KERN_WARNING "%s: Unknown Rx FIFO size %d\n",
499 dev->ndev->name, rx_size);
500 }
501
502 return ret;
503 }
504
__emac4_calc_base_mr1(struct emac_instance * dev,int tx_size,int rx_size)505 static u32 __emac4_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_size)
506 {
507 u32 ret = EMAC_MR1_VLE | EMAC_MR1_IST | EMAC4_MR1_TR |
508 EMAC4_MR1_OBCI(dev->opb_bus_freq / 1000000);
509
510 DBG2(dev, "__emac4_calc_base_mr1" NL);
511
512 switch(tx_size) {
513 case 16384:
514 ret |= EMAC4_MR1_TFS_16K;
515 break;
516 case 8192:
517 ret |= EMAC4_MR1_TFS_8K;
518 break;
519 case 4096:
520 ret |= EMAC4_MR1_TFS_4K;
521 break;
522 case 2048:
523 ret |= EMAC4_MR1_TFS_2K;
524 break;
525 default:
526 printk(KERN_WARNING "%s: Unknown Tx FIFO size %d\n",
527 dev->ndev->name, tx_size);
528 }
529
530 switch(rx_size) {
531 case 16384:
532 ret |= EMAC4_MR1_RFS_16K;
533 break;
534 case 8192:
535 ret |= EMAC4_MR1_RFS_8K;
536 break;
537 case 4096:
538 ret |= EMAC4_MR1_RFS_4K;
539 break;
540 case 2048:
541 ret |= EMAC4_MR1_RFS_2K;
542 break;
543 default:
544 printk(KERN_WARNING "%s: Unknown Rx FIFO size %d\n",
545 dev->ndev->name, rx_size);
546 }
547
548 return ret;
549 }
550
emac_calc_base_mr1(struct emac_instance * dev,int tx_size,int rx_size)551 static u32 emac_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_size)
552 {
553 return emac_has_feature(dev, EMAC_FTR_EMAC4) ?
554 __emac4_calc_base_mr1(dev, tx_size, rx_size) :
555 __emac_calc_base_mr1(dev, tx_size, rx_size);
556 }
557
emac_calc_trtr(struct emac_instance * dev,unsigned int size)558 static inline u32 emac_calc_trtr(struct emac_instance *dev, unsigned int size)
559 {
560 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
561 return ((size >> 6) - 1) << EMAC_TRTR_SHIFT_EMAC4;
562 else
563 return ((size >> 6) - 1) << EMAC_TRTR_SHIFT;
564 }
565
emac_calc_rwmr(struct emac_instance * dev,unsigned int low,unsigned int high)566 static inline u32 emac_calc_rwmr(struct emac_instance *dev,
567 unsigned int low, unsigned int high)
568 {
569 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
570 return (low << 22) | ( (high & 0x3ff) << 6);
571 else
572 return (low << 23) | ( (high & 0x1ff) << 7);
573 }
574
emac_configure(struct emac_instance * dev)575 static int emac_configure(struct emac_instance *dev)
576 {
577 struct emac_regs __iomem *p = dev->emacp;
578 struct net_device *ndev = dev->ndev;
579 int tx_size, rx_size, link = netif_carrier_ok(dev->ndev);
580 u32 r, mr1 = 0;
581
582 DBG(dev, "configure" NL);
583
584 if (!link) {
585 out_be32(&p->mr1, in_be32(&p->mr1)
586 | EMAC_MR1_FDE | EMAC_MR1_ILE);
587 udelay(100);
588 } else if (emac_reset(dev) < 0)
589 return -ETIMEDOUT;
590
591 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
592 tah_reset(dev->tah_dev);
593
594 DBG(dev, " link = %d duplex = %d, pause = %d, asym_pause = %d\n",
595 link, dev->phy.duplex, dev->phy.pause, dev->phy.asym_pause);
596
597 /* Default fifo sizes */
598 tx_size = dev->tx_fifo_size;
599 rx_size = dev->rx_fifo_size;
600
601 /* No link, force loopback */
602 if (!link)
603 mr1 = EMAC_MR1_FDE | EMAC_MR1_ILE;
604
605 /* Check for full duplex */
606 else if (dev->phy.duplex == DUPLEX_FULL)
607 mr1 |= EMAC_MR1_FDE | EMAC_MR1_MWSW_001;
608
609 /* Adjust fifo sizes, mr1 and timeouts based on link speed */
610 dev->stop_timeout = STOP_TIMEOUT_10;
611 switch (dev->phy.speed) {
612 case SPEED_1000:
613 if (emac_phy_gpcs(dev->phy.mode)) {
614 mr1 |= EMAC_MR1_MF_1000GPCS | EMAC_MR1_MF_IPPA(
615 (dev->phy.gpcs_address != 0xffffffff) ?
616 dev->phy.gpcs_address : dev->phy.address);
617
618 /* Put some arbitrary OUI, Manuf & Rev IDs so we can
619 * identify this GPCS PHY later.
620 */
621 out_be32(&p->u1.emac4.ipcr, 0xdeadbeef);
622 } else
623 mr1 |= EMAC_MR1_MF_1000;
624
625 /* Extended fifo sizes */
626 tx_size = dev->tx_fifo_size_gige;
627 rx_size = dev->rx_fifo_size_gige;
628
629 if (dev->ndev->mtu > ETH_DATA_LEN) {
630 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
631 mr1 |= EMAC4_MR1_JPSM;
632 else
633 mr1 |= EMAC_MR1_JPSM;
634 dev->stop_timeout = STOP_TIMEOUT_1000_JUMBO;
635 } else
636 dev->stop_timeout = STOP_TIMEOUT_1000;
637 break;
638 case SPEED_100:
639 mr1 |= EMAC_MR1_MF_100;
640 dev->stop_timeout = STOP_TIMEOUT_100;
641 break;
642 default: /* make gcc happy */
643 break;
644 }
645
646 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
647 rgmii_set_speed(dev->rgmii_dev, dev->rgmii_port,
648 dev->phy.speed);
649 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
650 zmii_set_speed(dev->zmii_dev, dev->zmii_port, dev->phy.speed);
651
652 /* on 40x erratum forces us to NOT use integrated flow control,
653 * let's hope it works on 44x ;)
654 */
655 if (!emac_has_feature(dev, EMAC_FTR_NO_FLOW_CONTROL_40x) &&
656 dev->phy.duplex == DUPLEX_FULL) {
657 if (dev->phy.pause)
658 mr1 |= EMAC_MR1_EIFC | EMAC_MR1_APP;
659 else if (dev->phy.asym_pause)
660 mr1 |= EMAC_MR1_APP;
661 }
662
663 /* Add base settings & fifo sizes & program MR1 */
664 mr1 |= emac_calc_base_mr1(dev, tx_size, rx_size);
665 out_be32(&p->mr1, mr1);
666
667 /* Set individual MAC address */
668 out_be32(&p->iahr, (ndev->dev_addr[0] << 8) | ndev->dev_addr[1]);
669 out_be32(&p->ialr, (ndev->dev_addr[2] << 24) |
670 (ndev->dev_addr[3] << 16) | (ndev->dev_addr[4] << 8) |
671 ndev->dev_addr[5]);
672
673 /* VLAN Tag Protocol ID */
674 out_be32(&p->vtpid, 0x8100);
675
676 /* Receive mode register */
677 r = emac_iff2rmr(ndev);
678 if (r & EMAC_RMR_MAE)
679 emac_hash_mc(dev);
680 out_be32(&p->rmr, r);
681
682 /* FIFOs thresholds */
683 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
684 r = EMAC4_TMR1((dev->mal_burst_size / dev->fifo_entry_size) + 1,
685 tx_size / 2 / dev->fifo_entry_size);
686 else
687 r = EMAC_TMR1((dev->mal_burst_size / dev->fifo_entry_size) + 1,
688 tx_size / 2 / dev->fifo_entry_size);
689 out_be32(&p->tmr1, r);
690 out_be32(&p->trtr, emac_calc_trtr(dev, tx_size / 2));
691
692 /* PAUSE frame is sent when RX FIFO reaches its high-water mark,
693 there should be still enough space in FIFO to allow the our link
694 partner time to process this frame and also time to send PAUSE
695 frame itself.
696
697 Here is the worst case scenario for the RX FIFO "headroom"
698 (from "The Switch Book") (100Mbps, without preamble, inter-frame gap):
699
700 1) One maximum-length frame on TX 1522 bytes
701 2) One PAUSE frame time 64 bytes
702 3) PAUSE frame decode time allowance 64 bytes
703 4) One maximum-length frame on RX 1522 bytes
704 5) Round-trip propagation delay of the link (100Mb) 15 bytes
705 ----------
706 3187 bytes
707
708 I chose to set high-water mark to RX_FIFO_SIZE / 4 (1024 bytes)
709 low-water mark to RX_FIFO_SIZE / 8 (512 bytes)
710 */
711 r = emac_calc_rwmr(dev, rx_size / 8 / dev->fifo_entry_size,
712 rx_size / 4 / dev->fifo_entry_size);
713 out_be32(&p->rwmr, r);
714
715 /* Set PAUSE timer to the maximum */
716 out_be32(&p->ptr, 0xffff);
717
718 /* IRQ sources */
719 r = EMAC_ISR_OVR | EMAC_ISR_BP | EMAC_ISR_SE |
720 EMAC_ISR_ALE | EMAC_ISR_BFCS | EMAC_ISR_PTLE | EMAC_ISR_ORE |
721 EMAC_ISR_IRE | EMAC_ISR_TE;
722 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
723 r |= EMAC4_ISR_TXPE | EMAC4_ISR_RXPE /* | EMAC4_ISR_TXUE |
724 EMAC4_ISR_RXOE | */;
725 out_be32(&p->iser, r);
726
727 /* We need to take GPCS PHY out of isolate mode after EMAC reset */
728 if (emac_phy_gpcs(dev->phy.mode)) {
729 if (dev->phy.gpcs_address != 0xffffffff)
730 emac_mii_reset_gpcs(&dev->phy);
731 else
732 emac_mii_reset_phy(&dev->phy);
733 }
734
735 return 0;
736 }
737
emac_reinitialize(struct emac_instance * dev)738 static void emac_reinitialize(struct emac_instance *dev)
739 {
740 DBG(dev, "reinitialize" NL);
741
742 emac_netif_stop(dev);
743 if (!emac_configure(dev)) {
744 emac_tx_enable(dev);
745 emac_rx_enable(dev);
746 }
747 emac_netif_start(dev);
748 }
749
emac_full_tx_reset(struct emac_instance * dev)750 static void emac_full_tx_reset(struct emac_instance *dev)
751 {
752 DBG(dev, "full_tx_reset" NL);
753
754 emac_tx_disable(dev);
755 mal_disable_tx_channel(dev->mal, dev->mal_tx_chan);
756 emac_clean_tx_ring(dev);
757 dev->tx_cnt = dev->tx_slot = dev->ack_slot = 0;
758
759 emac_configure(dev);
760
761 mal_enable_tx_channel(dev->mal, dev->mal_tx_chan);
762 emac_tx_enable(dev);
763 emac_rx_enable(dev);
764 }
765
emac_reset_work(struct work_struct * work)766 static void emac_reset_work(struct work_struct *work)
767 {
768 struct emac_instance *dev = container_of(work, struct emac_instance, reset_work);
769
770 DBG(dev, "reset_work" NL);
771
772 mutex_lock(&dev->link_lock);
773 if (dev->opened) {
774 emac_netif_stop(dev);
775 emac_full_tx_reset(dev);
776 emac_netif_start(dev);
777 }
778 mutex_unlock(&dev->link_lock);
779 }
780
emac_tx_timeout(struct net_device * ndev,unsigned int txqueue)781 static void emac_tx_timeout(struct net_device *ndev, unsigned int txqueue)
782 {
783 struct emac_instance *dev = netdev_priv(ndev);
784
785 DBG(dev, "tx_timeout" NL);
786
787 schedule_work(&dev->reset_work);
788 }
789
790
emac_phy_done(struct emac_instance * dev,u32 stacr)791 static inline int emac_phy_done(struct emac_instance *dev, u32 stacr)
792 {
793 int done = !!(stacr & EMAC_STACR_OC);
794
795 if (emac_has_feature(dev, EMAC_FTR_STACR_OC_INVERT))
796 done = !done;
797
798 return done;
799 };
800
__emac_mdio_read(struct emac_instance * dev,u8 id,u8 reg)801 static int __emac_mdio_read(struct emac_instance *dev, u8 id, u8 reg)
802 {
803 struct emac_regs __iomem *p = dev->emacp;
804 u32 r = 0;
805 int n, err = -ETIMEDOUT;
806
807 mutex_lock(&dev->mdio_lock);
808
809 DBG2(dev, "mdio_read(%02x,%02x)" NL, id, reg);
810
811 /* Enable proper MDIO port */
812 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
813 zmii_get_mdio(dev->zmii_dev, dev->zmii_port);
814 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
815 rgmii_get_mdio(dev->rgmii_dev, dev->rgmii_port);
816
817 /* Wait for management interface to become idle */
818 n = 20;
819 while (!emac_phy_done(dev, in_be32(&p->stacr))) {
820 udelay(1);
821 if (!--n) {
822 DBG2(dev, " -> timeout wait idle\n");
823 goto bail;
824 }
825 }
826
827 /* Issue read command */
828 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
829 r = EMAC4_STACR_BASE(dev->opb_bus_freq);
830 else
831 r = EMAC_STACR_BASE(dev->opb_bus_freq);
832 if (emac_has_feature(dev, EMAC_FTR_STACR_OC_INVERT))
833 r |= EMAC_STACR_OC;
834 if (emac_has_feature(dev, EMAC_FTR_HAS_NEW_STACR))
835 r |= EMACX_STACR_STAC_READ;
836 else
837 r |= EMAC_STACR_STAC_READ;
838 r |= (reg & EMAC_STACR_PRA_MASK)
839 | ((id & EMAC_STACR_PCDA_MASK) << EMAC_STACR_PCDA_SHIFT);
840 out_be32(&p->stacr, r);
841
842 /* Wait for read to complete */
843 n = 200;
844 while (!emac_phy_done(dev, (r = in_be32(&p->stacr)))) {
845 udelay(1);
846 if (!--n) {
847 DBG2(dev, " -> timeout wait complete\n");
848 goto bail;
849 }
850 }
851
852 if (unlikely(r & EMAC_STACR_PHYE)) {
853 DBG(dev, "mdio_read(%02x, %02x) failed" NL, id, reg);
854 err = -EREMOTEIO;
855 goto bail;
856 }
857
858 r = ((r >> EMAC_STACR_PHYD_SHIFT) & EMAC_STACR_PHYD_MASK);
859
860 DBG2(dev, "mdio_read -> %04x" NL, r);
861 err = 0;
862 bail:
863 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
864 rgmii_put_mdio(dev->rgmii_dev, dev->rgmii_port);
865 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
866 zmii_put_mdio(dev->zmii_dev, dev->zmii_port);
867 mutex_unlock(&dev->mdio_lock);
868
869 return err == 0 ? r : err;
870 }
871
__emac_mdio_write(struct emac_instance * dev,u8 id,u8 reg,u16 val)872 static void __emac_mdio_write(struct emac_instance *dev, u8 id, u8 reg,
873 u16 val)
874 {
875 struct emac_regs __iomem *p = dev->emacp;
876 u32 r = 0;
877 int n;
878
879 mutex_lock(&dev->mdio_lock);
880
881 DBG2(dev, "mdio_write(%02x,%02x,%04x)" NL, id, reg, val);
882
883 /* Enable proper MDIO port */
884 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
885 zmii_get_mdio(dev->zmii_dev, dev->zmii_port);
886 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
887 rgmii_get_mdio(dev->rgmii_dev, dev->rgmii_port);
888
889 /* Wait for management interface to be idle */
890 n = 20;
891 while (!emac_phy_done(dev, in_be32(&p->stacr))) {
892 udelay(1);
893 if (!--n) {
894 DBG2(dev, " -> timeout wait idle\n");
895 goto bail;
896 }
897 }
898
899 /* Issue write command */
900 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
901 r = EMAC4_STACR_BASE(dev->opb_bus_freq);
902 else
903 r = EMAC_STACR_BASE(dev->opb_bus_freq);
904 if (emac_has_feature(dev, EMAC_FTR_STACR_OC_INVERT))
905 r |= EMAC_STACR_OC;
906 if (emac_has_feature(dev, EMAC_FTR_HAS_NEW_STACR))
907 r |= EMACX_STACR_STAC_WRITE;
908 else
909 r |= EMAC_STACR_STAC_WRITE;
910 r |= (reg & EMAC_STACR_PRA_MASK) |
911 ((id & EMAC_STACR_PCDA_MASK) << EMAC_STACR_PCDA_SHIFT) |
912 (val << EMAC_STACR_PHYD_SHIFT);
913 out_be32(&p->stacr, r);
914
915 /* Wait for write to complete */
916 n = 200;
917 while (!emac_phy_done(dev, in_be32(&p->stacr))) {
918 udelay(1);
919 if (!--n) {
920 DBG2(dev, " -> timeout wait complete\n");
921 goto bail;
922 }
923 }
924 bail:
925 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
926 rgmii_put_mdio(dev->rgmii_dev, dev->rgmii_port);
927 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
928 zmii_put_mdio(dev->zmii_dev, dev->zmii_port);
929 mutex_unlock(&dev->mdio_lock);
930 }
931
emac_mdio_read(struct net_device * ndev,int id,int reg)932 static int emac_mdio_read(struct net_device *ndev, int id, int reg)
933 {
934 struct emac_instance *dev = netdev_priv(ndev);
935 int res;
936
937 res = __emac_mdio_read((dev->mdio_instance &&
938 dev->phy.gpcs_address != id) ?
939 dev->mdio_instance : dev,
940 (u8) id, (u8) reg);
941 return res;
942 }
943
emac_mdio_write(struct net_device * ndev,int id,int reg,int val)944 static void emac_mdio_write(struct net_device *ndev, int id, int reg, int val)
945 {
946 struct emac_instance *dev = netdev_priv(ndev);
947
948 __emac_mdio_write((dev->mdio_instance &&
949 dev->phy.gpcs_address != id) ?
950 dev->mdio_instance : dev,
951 (u8) id, (u8) reg, (u16) val);
952 }
953
954 /* Tx lock BH */
__emac_set_multicast_list(struct emac_instance * dev)955 static void __emac_set_multicast_list(struct emac_instance *dev)
956 {
957 struct emac_regs __iomem *p = dev->emacp;
958 u32 rmr = emac_iff2rmr(dev->ndev);
959
960 DBG(dev, "__multicast %08x" NL, rmr);
961
962 /* I decided to relax register access rules here to avoid
963 * full EMAC reset.
964 *
965 * There is a real problem with EMAC4 core if we use MWSW_001 bit
966 * in MR1 register and do a full EMAC reset.
967 * One TX BD status update is delayed and, after EMAC reset, it
968 * never happens, resulting in TX hung (it'll be recovered by TX
969 * timeout handler eventually, but this is just gross).
970 * So we either have to do full TX reset or try to cheat here :)
971 *
972 * The only required change is to RX mode register, so I *think* all
973 * we need is just to stop RX channel. This seems to work on all
974 * tested SoCs. --ebs
975 *
976 * If we need the full reset, we might just trigger the workqueue
977 * and do it async... a bit nasty but should work --BenH
978 */
979 dev->mcast_pending = 0;
980 emac_rx_disable(dev);
981 if (rmr & EMAC_RMR_MAE)
982 emac_hash_mc(dev);
983 out_be32(&p->rmr, rmr);
984 emac_rx_enable(dev);
985 }
986
987 /* Tx lock BH */
emac_set_multicast_list(struct net_device * ndev)988 static void emac_set_multicast_list(struct net_device *ndev)
989 {
990 struct emac_instance *dev = netdev_priv(ndev);
991
992 DBG(dev, "multicast" NL);
993
994 BUG_ON(!netif_running(dev->ndev));
995
996 if (dev->no_mcast) {
997 dev->mcast_pending = 1;
998 return;
999 }
1000
1001 mutex_lock(&dev->link_lock);
1002 __emac_set_multicast_list(dev);
1003 mutex_unlock(&dev->link_lock);
1004 }
1005
emac_set_mac_address(struct net_device * ndev,void * sa)1006 static int emac_set_mac_address(struct net_device *ndev, void *sa)
1007 {
1008 struct emac_instance *dev = netdev_priv(ndev);
1009 struct sockaddr *addr = sa;
1010 struct emac_regs __iomem *p = dev->emacp;
1011
1012 if (!is_valid_ether_addr(addr->sa_data))
1013 return -EADDRNOTAVAIL;
1014
1015 mutex_lock(&dev->link_lock);
1016
1017 eth_hw_addr_set(ndev, addr->sa_data);
1018
1019 emac_rx_disable(dev);
1020 emac_tx_disable(dev);
1021 out_be32(&p->iahr, (ndev->dev_addr[0] << 8) | ndev->dev_addr[1]);
1022 out_be32(&p->ialr, (ndev->dev_addr[2] << 24) |
1023 (ndev->dev_addr[3] << 16) | (ndev->dev_addr[4] << 8) |
1024 ndev->dev_addr[5]);
1025 emac_tx_enable(dev);
1026 emac_rx_enable(dev);
1027
1028 mutex_unlock(&dev->link_lock);
1029
1030 return 0;
1031 }
1032
emac_resize_rx_ring(struct emac_instance * dev,int new_mtu)1033 static int emac_resize_rx_ring(struct emac_instance *dev, int new_mtu)
1034 {
1035 int rx_sync_size = emac_rx_sync_size(new_mtu);
1036 int rx_skb_size = emac_rx_skb_size(new_mtu);
1037 int i, ret = 0;
1038 int mr1_jumbo_bit_change = 0;
1039
1040 mutex_lock(&dev->link_lock);
1041 emac_netif_stop(dev);
1042 emac_rx_disable(dev);
1043 mal_disable_rx_channel(dev->mal, dev->mal_rx_chan);
1044
1045 if (dev->rx_sg_skb) {
1046 ++dev->estats.rx_dropped_resize;
1047 dev_kfree_skb(dev->rx_sg_skb);
1048 dev->rx_sg_skb = NULL;
1049 }
1050
1051 /* Make a first pass over RX ring and mark BDs ready, dropping
1052 * non-processed packets on the way. We need this as a separate pass
1053 * to simplify error recovery in the case of allocation failure later.
1054 */
1055 for (i = 0; i < NUM_RX_BUFF; ++i) {
1056 if (dev->rx_desc[i].ctrl & MAL_RX_CTRL_FIRST)
1057 ++dev->estats.rx_dropped_resize;
1058
1059 dev->rx_desc[i].data_len = 0;
1060 dev->rx_desc[i].ctrl = MAL_RX_CTRL_EMPTY |
1061 (i == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1062 }
1063
1064 /* Reallocate RX ring only if bigger skb buffers are required */
1065 if (rx_skb_size <= dev->rx_skb_size)
1066 goto skip;
1067
1068 /* Second pass, allocate new skbs */
1069 for (i = 0; i < NUM_RX_BUFF; ++i) {
1070 struct sk_buff *skb;
1071
1072 skb = netdev_alloc_skb_ip_align(dev->ndev, rx_skb_size);
1073 if (!skb) {
1074 ret = -ENOMEM;
1075 goto oom;
1076 }
1077
1078 BUG_ON(!dev->rx_skb[i]);
1079 dev_kfree_skb(dev->rx_skb[i]);
1080
1081 dev->rx_desc[i].data_ptr =
1082 dma_map_single(&dev->ofdev->dev, skb->data - NET_IP_ALIGN,
1083 rx_sync_size, DMA_FROM_DEVICE)
1084 + NET_IP_ALIGN;
1085 dev->rx_skb[i] = skb;
1086 }
1087 skip:
1088 /* Check if we need to change "Jumbo" bit in MR1 */
1089 if (emac_has_feature(dev, EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE)) {
1090 mr1_jumbo_bit_change = (new_mtu > ETH_DATA_LEN) ||
1091 (dev->ndev->mtu > ETH_DATA_LEN);
1092 } else {
1093 mr1_jumbo_bit_change = (new_mtu > ETH_DATA_LEN) ^
1094 (dev->ndev->mtu > ETH_DATA_LEN);
1095 }
1096
1097 if (mr1_jumbo_bit_change) {
1098 /* This is to prevent starting RX channel in emac_rx_enable() */
1099 set_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1100
1101 dev->ndev->mtu = new_mtu;
1102 emac_full_tx_reset(dev);
1103 }
1104
1105 mal_set_rcbs(dev->mal, dev->mal_rx_chan, emac_rx_size(new_mtu));
1106 oom:
1107 /* Restart RX */
1108 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1109 dev->rx_slot = 0;
1110 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1111 emac_rx_enable(dev);
1112 emac_netif_start(dev);
1113 mutex_unlock(&dev->link_lock);
1114
1115 return ret;
1116 }
1117
1118 /* Process ctx, rtnl_lock semaphore */
emac_change_mtu(struct net_device * ndev,int new_mtu)1119 static int emac_change_mtu(struct net_device *ndev, int new_mtu)
1120 {
1121 struct emac_instance *dev = netdev_priv(ndev);
1122 int ret = 0;
1123
1124 DBG(dev, "change_mtu(%d)" NL, new_mtu);
1125
1126 if (netif_running(ndev)) {
1127 /* Check if we really need to reinitialize RX ring */
1128 if (emac_rx_skb_size(ndev->mtu) != emac_rx_skb_size(new_mtu))
1129 ret = emac_resize_rx_ring(dev, new_mtu);
1130 }
1131
1132 if (!ret) {
1133 ndev->mtu = new_mtu;
1134 dev->rx_skb_size = emac_rx_skb_size(new_mtu);
1135 dev->rx_sync_size = emac_rx_sync_size(new_mtu);
1136 }
1137
1138 return ret;
1139 }
1140
emac_clean_tx_ring(struct emac_instance * dev)1141 static void emac_clean_tx_ring(struct emac_instance *dev)
1142 {
1143 int i;
1144
1145 for (i = 0; i < NUM_TX_BUFF; ++i) {
1146 if (dev->tx_skb[i]) {
1147 dev_kfree_skb(dev->tx_skb[i]);
1148 dev->tx_skb[i] = NULL;
1149 if (dev->tx_desc[i].ctrl & MAL_TX_CTRL_READY)
1150 ++dev->estats.tx_dropped;
1151 }
1152 dev->tx_desc[i].ctrl = 0;
1153 dev->tx_desc[i].data_ptr = 0;
1154 }
1155 }
1156
emac_clean_rx_ring(struct emac_instance * dev)1157 static void emac_clean_rx_ring(struct emac_instance *dev)
1158 {
1159 int i;
1160
1161 for (i = 0; i < NUM_RX_BUFF; ++i)
1162 if (dev->rx_skb[i]) {
1163 dev->rx_desc[i].ctrl = 0;
1164 dev_kfree_skb(dev->rx_skb[i]);
1165 dev->rx_skb[i] = NULL;
1166 dev->rx_desc[i].data_ptr = 0;
1167 }
1168
1169 if (dev->rx_sg_skb) {
1170 dev_kfree_skb(dev->rx_sg_skb);
1171 dev->rx_sg_skb = NULL;
1172 }
1173 }
1174
1175 static int
__emac_prepare_rx_skb(struct sk_buff * skb,struct emac_instance * dev,int slot)1176 __emac_prepare_rx_skb(struct sk_buff *skb, struct emac_instance *dev, int slot)
1177 {
1178 if (unlikely(!skb))
1179 return -ENOMEM;
1180
1181 dev->rx_skb[slot] = skb;
1182 dev->rx_desc[slot].data_len = 0;
1183
1184 dev->rx_desc[slot].data_ptr =
1185 dma_map_single(&dev->ofdev->dev, skb->data - NET_IP_ALIGN,
1186 dev->rx_sync_size, DMA_FROM_DEVICE) + NET_IP_ALIGN;
1187 wmb();
1188 dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
1189 (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1190
1191 return 0;
1192 }
1193
1194 static int
emac_alloc_rx_skb(struct emac_instance * dev,int slot)1195 emac_alloc_rx_skb(struct emac_instance *dev, int slot)
1196 {
1197 struct sk_buff *skb;
1198
1199 skb = __netdev_alloc_skb_ip_align(dev->ndev, dev->rx_skb_size,
1200 GFP_KERNEL);
1201
1202 return __emac_prepare_rx_skb(skb, dev, slot);
1203 }
1204
1205 static int
emac_alloc_rx_skb_napi(struct emac_instance * dev,int slot)1206 emac_alloc_rx_skb_napi(struct emac_instance *dev, int slot)
1207 {
1208 struct sk_buff *skb;
1209
1210 skb = napi_alloc_skb(&dev->mal->napi, dev->rx_skb_size);
1211
1212 return __emac_prepare_rx_skb(skb, dev, slot);
1213 }
1214
emac_print_link_status(struct emac_instance * dev)1215 static void emac_print_link_status(struct emac_instance *dev)
1216 {
1217 if (netif_carrier_ok(dev->ndev))
1218 printk(KERN_INFO "%s: link is up, %d %s%s\n",
1219 dev->ndev->name, dev->phy.speed,
1220 dev->phy.duplex == DUPLEX_FULL ? "FDX" : "HDX",
1221 dev->phy.pause ? ", pause enabled" :
1222 dev->phy.asym_pause ? ", asymmetric pause enabled" : "");
1223 else
1224 printk(KERN_INFO "%s: link is down\n", dev->ndev->name);
1225 }
1226
1227 /* Process ctx, rtnl_lock semaphore */
emac_open(struct net_device * ndev)1228 static int emac_open(struct net_device *ndev)
1229 {
1230 struct emac_instance *dev = netdev_priv(ndev);
1231 int err, i;
1232
1233 DBG(dev, "open" NL);
1234
1235 /* Setup error IRQ handler */
1236 err = request_irq(dev->emac_irq, emac_irq, 0, "EMAC", dev);
1237 if (err) {
1238 printk(KERN_ERR "%s: failed to request IRQ %d\n",
1239 ndev->name, dev->emac_irq);
1240 return err;
1241 }
1242
1243 /* Allocate RX ring */
1244 for (i = 0; i < NUM_RX_BUFF; ++i)
1245 if (emac_alloc_rx_skb(dev, i)) {
1246 printk(KERN_ERR "%s: failed to allocate RX ring\n",
1247 ndev->name);
1248 goto oom;
1249 }
1250
1251 dev->tx_cnt = dev->tx_slot = dev->ack_slot = dev->rx_slot = 0;
1252 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1253 dev->rx_sg_skb = NULL;
1254
1255 mutex_lock(&dev->link_lock);
1256 dev->opened = 1;
1257
1258 /* Start PHY polling now.
1259 */
1260 if (dev->phy.address >= 0) {
1261 int link_poll_interval;
1262 if (dev->phy.def->ops->poll_link(&dev->phy)) {
1263 dev->phy.def->ops->read_link(&dev->phy);
1264 emac_rx_clk_default(dev);
1265 netif_carrier_on(dev->ndev);
1266 link_poll_interval = PHY_POLL_LINK_ON;
1267 } else {
1268 emac_rx_clk_tx(dev);
1269 netif_carrier_off(dev->ndev);
1270 link_poll_interval = PHY_POLL_LINK_OFF;
1271 }
1272 dev->link_polling = 1;
1273 wmb();
1274 schedule_delayed_work(&dev->link_work, link_poll_interval);
1275 emac_print_link_status(dev);
1276 } else
1277 netif_carrier_on(dev->ndev);
1278
1279 /* Required for Pause packet support in EMAC */
1280 dev_mc_add_global(ndev, default_mcast_addr);
1281
1282 emac_configure(dev);
1283 mal_poll_add(dev->mal, &dev->commac);
1284 mal_enable_tx_channel(dev->mal, dev->mal_tx_chan);
1285 mal_set_rcbs(dev->mal, dev->mal_rx_chan, emac_rx_size(ndev->mtu));
1286 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1287 emac_tx_enable(dev);
1288 emac_rx_enable(dev);
1289 emac_netif_start(dev);
1290
1291 mutex_unlock(&dev->link_lock);
1292
1293 return 0;
1294 oom:
1295 emac_clean_rx_ring(dev);
1296 free_irq(dev->emac_irq, dev);
1297
1298 return -ENOMEM;
1299 }
1300
1301 /* BHs disabled */
1302 #if 0
1303 static int emac_link_differs(struct emac_instance *dev)
1304 {
1305 u32 r = in_be32(&dev->emacp->mr1);
1306
1307 int duplex = r & EMAC_MR1_FDE ? DUPLEX_FULL : DUPLEX_HALF;
1308 int speed, pause, asym_pause;
1309
1310 if (r & EMAC_MR1_MF_1000)
1311 speed = SPEED_1000;
1312 else if (r & EMAC_MR1_MF_100)
1313 speed = SPEED_100;
1314 else
1315 speed = SPEED_10;
1316
1317 switch (r & (EMAC_MR1_EIFC | EMAC_MR1_APP)) {
1318 case (EMAC_MR1_EIFC | EMAC_MR1_APP):
1319 pause = 1;
1320 asym_pause = 0;
1321 break;
1322 case EMAC_MR1_APP:
1323 pause = 0;
1324 asym_pause = 1;
1325 break;
1326 default:
1327 pause = asym_pause = 0;
1328 }
1329 return speed != dev->phy.speed || duplex != dev->phy.duplex ||
1330 pause != dev->phy.pause || asym_pause != dev->phy.asym_pause;
1331 }
1332 #endif
1333
emac_link_timer(struct work_struct * work)1334 static void emac_link_timer(struct work_struct *work)
1335 {
1336 struct emac_instance *dev =
1337 container_of(to_delayed_work(work),
1338 struct emac_instance, link_work);
1339 int link_poll_interval;
1340
1341 mutex_lock(&dev->link_lock);
1342 DBG2(dev, "link timer" NL);
1343
1344 if (!dev->opened)
1345 goto bail;
1346
1347 if (dev->phy.def->ops->poll_link(&dev->phy)) {
1348 if (!netif_carrier_ok(dev->ndev)) {
1349 emac_rx_clk_default(dev);
1350 /* Get new link parameters */
1351 dev->phy.def->ops->read_link(&dev->phy);
1352
1353 netif_carrier_on(dev->ndev);
1354 emac_netif_stop(dev);
1355 emac_full_tx_reset(dev);
1356 emac_netif_start(dev);
1357 emac_print_link_status(dev);
1358 }
1359 link_poll_interval = PHY_POLL_LINK_ON;
1360 } else {
1361 if (netif_carrier_ok(dev->ndev)) {
1362 emac_rx_clk_tx(dev);
1363 netif_carrier_off(dev->ndev);
1364 netif_tx_disable(dev->ndev);
1365 emac_reinitialize(dev);
1366 emac_print_link_status(dev);
1367 }
1368 link_poll_interval = PHY_POLL_LINK_OFF;
1369 }
1370 schedule_delayed_work(&dev->link_work, link_poll_interval);
1371 bail:
1372 mutex_unlock(&dev->link_lock);
1373 }
1374
emac_force_link_update(struct emac_instance * dev)1375 static void emac_force_link_update(struct emac_instance *dev)
1376 {
1377 netif_carrier_off(dev->ndev);
1378 smp_rmb();
1379 if (dev->link_polling) {
1380 cancel_delayed_work_sync(&dev->link_work);
1381 if (dev->link_polling)
1382 schedule_delayed_work(&dev->link_work, PHY_POLL_LINK_OFF);
1383 }
1384 }
1385
1386 /* Process ctx, rtnl_lock semaphore */
emac_close(struct net_device * ndev)1387 static int emac_close(struct net_device *ndev)
1388 {
1389 struct emac_instance *dev = netdev_priv(ndev);
1390
1391 DBG(dev, "close" NL);
1392
1393 if (dev->phy.address >= 0) {
1394 dev->link_polling = 0;
1395 cancel_delayed_work_sync(&dev->link_work);
1396 }
1397 mutex_lock(&dev->link_lock);
1398 emac_netif_stop(dev);
1399 dev->opened = 0;
1400 mutex_unlock(&dev->link_lock);
1401
1402 emac_rx_disable(dev);
1403 emac_tx_disable(dev);
1404 mal_disable_rx_channel(dev->mal, dev->mal_rx_chan);
1405 mal_disable_tx_channel(dev->mal, dev->mal_tx_chan);
1406 mal_poll_del(dev->mal, &dev->commac);
1407
1408 emac_clean_tx_ring(dev);
1409 emac_clean_rx_ring(dev);
1410
1411 free_irq(dev->emac_irq, dev);
1412
1413 netif_carrier_off(ndev);
1414
1415 return 0;
1416 }
1417
emac_tx_csum(struct emac_instance * dev,struct sk_buff * skb)1418 static inline u16 emac_tx_csum(struct emac_instance *dev,
1419 struct sk_buff *skb)
1420 {
1421 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH) &&
1422 (skb->ip_summed == CHECKSUM_PARTIAL)) {
1423 ++dev->stats.tx_packets_csum;
1424 return EMAC_TX_CTRL_TAH_CSUM;
1425 }
1426 return 0;
1427 }
1428
emac_xmit_finish(struct emac_instance * dev,int len)1429 static inline netdev_tx_t emac_xmit_finish(struct emac_instance *dev, int len)
1430 {
1431 struct emac_regs __iomem *p = dev->emacp;
1432 struct net_device *ndev = dev->ndev;
1433
1434 /* Send the packet out. If the if makes a significant perf
1435 * difference, then we can store the TMR0 value in "dev"
1436 * instead
1437 */
1438 if (emac_has_feature(dev, EMAC_FTR_EMAC4))
1439 out_be32(&p->tmr0, EMAC4_TMR0_XMIT);
1440 else
1441 out_be32(&p->tmr0, EMAC_TMR0_XMIT);
1442
1443 if (unlikely(++dev->tx_cnt == NUM_TX_BUFF)) {
1444 netif_stop_queue(ndev);
1445 DBG2(dev, "stopped TX queue" NL);
1446 }
1447
1448 netif_trans_update(ndev);
1449 ++dev->stats.tx_packets;
1450 dev->stats.tx_bytes += len;
1451
1452 return NETDEV_TX_OK;
1453 }
1454
1455 /* Tx lock BH */
emac_start_xmit(struct sk_buff * skb,struct net_device * ndev)1456 static netdev_tx_t emac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1457 {
1458 struct emac_instance *dev = netdev_priv(ndev);
1459 unsigned int len = skb->len;
1460 int slot;
1461
1462 u16 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1463 MAL_TX_CTRL_LAST | emac_tx_csum(dev, skb);
1464
1465 slot = dev->tx_slot++;
1466 if (dev->tx_slot == NUM_TX_BUFF) {
1467 dev->tx_slot = 0;
1468 ctrl |= MAL_TX_CTRL_WRAP;
1469 }
1470
1471 DBG2(dev, "xmit(%u) %d" NL, len, slot);
1472
1473 dev->tx_skb[slot] = skb;
1474 dev->tx_desc[slot].data_ptr = dma_map_single(&dev->ofdev->dev,
1475 skb->data, len,
1476 DMA_TO_DEVICE);
1477 dev->tx_desc[slot].data_len = (u16) len;
1478 wmb();
1479 dev->tx_desc[slot].ctrl = ctrl;
1480
1481 return emac_xmit_finish(dev, len);
1482 }
1483
emac_xmit_split(struct emac_instance * dev,int slot,u32 pd,int len,int last,u16 base_ctrl)1484 static inline int emac_xmit_split(struct emac_instance *dev, int slot,
1485 u32 pd, int len, int last, u16 base_ctrl)
1486 {
1487 while (1) {
1488 u16 ctrl = base_ctrl;
1489 int chunk = min(len, MAL_MAX_TX_SIZE);
1490 len -= chunk;
1491
1492 slot = (slot + 1) % NUM_TX_BUFF;
1493
1494 if (last && !len)
1495 ctrl |= MAL_TX_CTRL_LAST;
1496 if (slot == NUM_TX_BUFF - 1)
1497 ctrl |= MAL_TX_CTRL_WRAP;
1498
1499 dev->tx_skb[slot] = NULL;
1500 dev->tx_desc[slot].data_ptr = pd;
1501 dev->tx_desc[slot].data_len = (u16) chunk;
1502 dev->tx_desc[slot].ctrl = ctrl;
1503 ++dev->tx_cnt;
1504
1505 if (!len)
1506 break;
1507
1508 pd += chunk;
1509 }
1510 return slot;
1511 }
1512
1513 /* Tx lock BH disabled (SG version for TAH equipped EMACs) */
1514 static netdev_tx_t
emac_start_xmit_sg(struct sk_buff * skb,struct net_device * ndev)1515 emac_start_xmit_sg(struct sk_buff *skb, struct net_device *ndev)
1516 {
1517 struct emac_instance *dev = netdev_priv(ndev);
1518 int nr_frags = skb_shinfo(skb)->nr_frags;
1519 int len = skb->len, chunk;
1520 int slot, i;
1521 u16 ctrl;
1522 u32 pd;
1523
1524 /* This is common "fast" path */
1525 if (likely(!nr_frags && len <= MAL_MAX_TX_SIZE))
1526 return emac_start_xmit(skb, ndev);
1527
1528 len -= skb->data_len;
1529
1530 /* Note, this is only an *estimation*, we can still run out of empty
1531 * slots because of the additional fragmentation into
1532 * MAL_MAX_TX_SIZE-sized chunks
1533 */
1534 if (unlikely(dev->tx_cnt + nr_frags + mal_tx_chunks(len) > NUM_TX_BUFF))
1535 goto stop_queue;
1536
1537 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1538 emac_tx_csum(dev, skb);
1539 slot = dev->tx_slot;
1540
1541 /* skb data */
1542 dev->tx_skb[slot] = NULL;
1543 chunk = min(len, MAL_MAX_TX_SIZE);
1544 dev->tx_desc[slot].data_ptr = pd =
1545 dma_map_single(&dev->ofdev->dev, skb->data, len, DMA_TO_DEVICE);
1546 dev->tx_desc[slot].data_len = (u16) chunk;
1547 len -= chunk;
1548 if (unlikely(len))
1549 slot = emac_xmit_split(dev, slot, pd + chunk, len, !nr_frags,
1550 ctrl);
1551 /* skb fragments */
1552 for (i = 0; i < nr_frags; ++i) {
1553 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1554 len = skb_frag_size(frag);
1555
1556 if (unlikely(dev->tx_cnt + mal_tx_chunks(len) >= NUM_TX_BUFF))
1557 goto undo_frame;
1558
1559 pd = skb_frag_dma_map(&dev->ofdev->dev, frag, 0, len,
1560 DMA_TO_DEVICE);
1561
1562 slot = emac_xmit_split(dev, slot, pd, len, i == nr_frags - 1,
1563 ctrl);
1564 }
1565
1566 DBG2(dev, "xmit_sg(%u) %d - %d" NL, skb->len, dev->tx_slot, slot);
1567
1568 /* Attach skb to the last slot so we don't release it too early */
1569 dev->tx_skb[slot] = skb;
1570
1571 /* Send the packet out */
1572 if (dev->tx_slot == NUM_TX_BUFF - 1)
1573 ctrl |= MAL_TX_CTRL_WRAP;
1574 wmb();
1575 dev->tx_desc[dev->tx_slot].ctrl = ctrl;
1576 dev->tx_slot = (slot + 1) % NUM_TX_BUFF;
1577
1578 return emac_xmit_finish(dev, skb->len);
1579
1580 undo_frame:
1581 /* Well, too bad. Our previous estimation was overly optimistic.
1582 * Undo everything.
1583 */
1584 while (slot != dev->tx_slot) {
1585 dev->tx_desc[slot].ctrl = 0;
1586 --dev->tx_cnt;
1587 if (--slot < 0)
1588 slot = NUM_TX_BUFF - 1;
1589 }
1590 ++dev->estats.tx_undo;
1591
1592 stop_queue:
1593 netif_stop_queue(ndev);
1594 DBG2(dev, "stopped TX queue" NL);
1595 return NETDEV_TX_BUSY;
1596 }
1597
1598 /* Tx lock BHs */
emac_parse_tx_error(struct emac_instance * dev,u16 ctrl)1599 static void emac_parse_tx_error(struct emac_instance *dev, u16 ctrl)
1600 {
1601 struct emac_error_stats *st = &dev->estats;
1602
1603 DBG(dev, "BD TX error %04x" NL, ctrl);
1604
1605 ++st->tx_bd_errors;
1606 if (ctrl & EMAC_TX_ST_BFCS)
1607 ++st->tx_bd_bad_fcs;
1608 if (ctrl & EMAC_TX_ST_LCS)
1609 ++st->tx_bd_carrier_loss;
1610 if (ctrl & EMAC_TX_ST_ED)
1611 ++st->tx_bd_excessive_deferral;
1612 if (ctrl & EMAC_TX_ST_EC)
1613 ++st->tx_bd_excessive_collisions;
1614 if (ctrl & EMAC_TX_ST_LC)
1615 ++st->tx_bd_late_collision;
1616 if (ctrl & EMAC_TX_ST_MC)
1617 ++st->tx_bd_multple_collisions;
1618 if (ctrl & EMAC_TX_ST_SC)
1619 ++st->tx_bd_single_collision;
1620 if (ctrl & EMAC_TX_ST_UR)
1621 ++st->tx_bd_underrun;
1622 if (ctrl & EMAC_TX_ST_SQE)
1623 ++st->tx_bd_sqe;
1624 }
1625
emac_poll_tx(void * param)1626 static void emac_poll_tx(void *param)
1627 {
1628 struct emac_instance *dev = param;
1629 u32 bad_mask;
1630
1631 DBG2(dev, "poll_tx, %d %d" NL, dev->tx_cnt, dev->ack_slot);
1632
1633 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
1634 bad_mask = EMAC_IS_BAD_TX_TAH;
1635 else
1636 bad_mask = EMAC_IS_BAD_TX;
1637
1638 netif_tx_lock_bh(dev->ndev);
1639 if (dev->tx_cnt) {
1640 u16 ctrl;
1641 int slot = dev->ack_slot, n = 0;
1642 again:
1643 ctrl = dev->tx_desc[slot].ctrl;
1644 if (!(ctrl & MAL_TX_CTRL_READY)) {
1645 struct sk_buff *skb = dev->tx_skb[slot];
1646 ++n;
1647
1648 if (skb) {
1649 dev_kfree_skb(skb);
1650 dev->tx_skb[slot] = NULL;
1651 }
1652 slot = (slot + 1) % NUM_TX_BUFF;
1653
1654 if (unlikely(ctrl & bad_mask))
1655 emac_parse_tx_error(dev, ctrl);
1656
1657 if (--dev->tx_cnt)
1658 goto again;
1659 }
1660 if (n) {
1661 dev->ack_slot = slot;
1662 if (netif_queue_stopped(dev->ndev) &&
1663 dev->tx_cnt < EMAC_TX_WAKEUP_THRESH)
1664 netif_wake_queue(dev->ndev);
1665
1666 DBG2(dev, "tx %d pkts" NL, n);
1667 }
1668 }
1669 netif_tx_unlock_bh(dev->ndev);
1670 }
1671
emac_recycle_rx_skb(struct emac_instance * dev,int slot,int len)1672 static inline void emac_recycle_rx_skb(struct emac_instance *dev, int slot,
1673 int len)
1674 {
1675 struct sk_buff *skb = dev->rx_skb[slot];
1676
1677 DBG2(dev, "recycle %d %d" NL, slot, len);
1678
1679 if (len)
1680 dma_map_single(&dev->ofdev->dev, skb->data - NET_IP_ALIGN,
1681 SKB_DATA_ALIGN(len + NET_IP_ALIGN),
1682 DMA_FROM_DEVICE);
1683
1684 dev->rx_desc[slot].data_len = 0;
1685 wmb();
1686 dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
1687 (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1688 }
1689
emac_parse_rx_error(struct emac_instance * dev,u16 ctrl)1690 static void emac_parse_rx_error(struct emac_instance *dev, u16 ctrl)
1691 {
1692 struct emac_error_stats *st = &dev->estats;
1693
1694 DBG(dev, "BD RX error %04x" NL, ctrl);
1695
1696 ++st->rx_bd_errors;
1697 if (ctrl & EMAC_RX_ST_OE)
1698 ++st->rx_bd_overrun;
1699 if (ctrl & EMAC_RX_ST_BP)
1700 ++st->rx_bd_bad_packet;
1701 if (ctrl & EMAC_RX_ST_RP)
1702 ++st->rx_bd_runt_packet;
1703 if (ctrl & EMAC_RX_ST_SE)
1704 ++st->rx_bd_short_event;
1705 if (ctrl & EMAC_RX_ST_AE)
1706 ++st->rx_bd_alignment_error;
1707 if (ctrl & EMAC_RX_ST_BFCS)
1708 ++st->rx_bd_bad_fcs;
1709 if (ctrl & EMAC_RX_ST_PTL)
1710 ++st->rx_bd_packet_too_long;
1711 if (ctrl & EMAC_RX_ST_ORE)
1712 ++st->rx_bd_out_of_range;
1713 if (ctrl & EMAC_RX_ST_IRE)
1714 ++st->rx_bd_in_range;
1715 }
1716
emac_rx_csum(struct emac_instance * dev,struct sk_buff * skb,u16 ctrl)1717 static inline void emac_rx_csum(struct emac_instance *dev,
1718 struct sk_buff *skb, u16 ctrl)
1719 {
1720 #ifdef CONFIG_IBM_EMAC_TAH
1721 if (!ctrl && dev->tah_dev) {
1722 skb->ip_summed = CHECKSUM_UNNECESSARY;
1723 ++dev->stats.rx_packets_csum;
1724 }
1725 #endif
1726 }
1727
emac_rx_sg_append(struct emac_instance * dev,int slot)1728 static inline int emac_rx_sg_append(struct emac_instance *dev, int slot)
1729 {
1730 if (likely(dev->rx_sg_skb != NULL)) {
1731 int len = dev->rx_desc[slot].data_len;
1732 int tot_len = dev->rx_sg_skb->len + len;
1733
1734 if (unlikely(tot_len + NET_IP_ALIGN > dev->rx_skb_size)) {
1735 ++dev->estats.rx_dropped_mtu;
1736 dev_kfree_skb(dev->rx_sg_skb);
1737 dev->rx_sg_skb = NULL;
1738 } else {
1739 memcpy(skb_tail_pointer(dev->rx_sg_skb),
1740 dev->rx_skb[slot]->data, len);
1741 skb_put(dev->rx_sg_skb, len);
1742 emac_recycle_rx_skb(dev, slot, len);
1743 return 0;
1744 }
1745 }
1746 emac_recycle_rx_skb(dev, slot, 0);
1747 return -1;
1748 }
1749
1750 /* NAPI poll context */
emac_poll_rx(void * param,int budget)1751 static int emac_poll_rx(void *param, int budget)
1752 {
1753 struct emac_instance *dev = param;
1754 int slot = dev->rx_slot, received = 0;
1755
1756 DBG2(dev, "poll_rx(%d)" NL, budget);
1757
1758 again:
1759 while (budget > 0) {
1760 int len;
1761 struct sk_buff *skb;
1762 u16 ctrl = dev->rx_desc[slot].ctrl;
1763
1764 if (ctrl & MAL_RX_CTRL_EMPTY)
1765 break;
1766
1767 skb = dev->rx_skb[slot];
1768 mb();
1769 len = dev->rx_desc[slot].data_len;
1770
1771 if (unlikely(!MAL_IS_SINGLE_RX(ctrl)))
1772 goto sg;
1773
1774 ctrl &= EMAC_BAD_RX_MASK;
1775 if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1776 emac_parse_rx_error(dev, ctrl);
1777 ++dev->estats.rx_dropped_error;
1778 emac_recycle_rx_skb(dev, slot, 0);
1779 len = 0;
1780 goto next;
1781 }
1782
1783 if (len < ETH_HLEN) {
1784 ++dev->estats.rx_dropped_stack;
1785 emac_recycle_rx_skb(dev, slot, len);
1786 goto next;
1787 }
1788
1789 if (len && len < EMAC_RX_COPY_THRESH) {
1790 struct sk_buff *copy_skb;
1791
1792 copy_skb = napi_alloc_skb(&dev->mal->napi, len);
1793 if (unlikely(!copy_skb))
1794 goto oom;
1795
1796 memcpy(copy_skb->data - NET_IP_ALIGN,
1797 skb->data - NET_IP_ALIGN,
1798 len + NET_IP_ALIGN);
1799 emac_recycle_rx_skb(dev, slot, len);
1800 skb = copy_skb;
1801 } else if (unlikely(emac_alloc_rx_skb_napi(dev, slot)))
1802 goto oom;
1803
1804 skb_put(skb, len);
1805 push_packet:
1806 skb->protocol = eth_type_trans(skb, dev->ndev);
1807 emac_rx_csum(dev, skb, ctrl);
1808
1809 if (unlikely(netif_receive_skb(skb) == NET_RX_DROP))
1810 ++dev->estats.rx_dropped_stack;
1811 next:
1812 ++dev->stats.rx_packets;
1813 skip:
1814 dev->stats.rx_bytes += len;
1815 slot = (slot + 1) % NUM_RX_BUFF;
1816 --budget;
1817 ++received;
1818 continue;
1819 sg:
1820 if (ctrl & MAL_RX_CTRL_FIRST) {
1821 BUG_ON(dev->rx_sg_skb);
1822 if (unlikely(emac_alloc_rx_skb_napi(dev, slot))) {
1823 DBG(dev, "rx OOM %d" NL, slot);
1824 ++dev->estats.rx_dropped_oom;
1825 emac_recycle_rx_skb(dev, slot, 0);
1826 } else {
1827 dev->rx_sg_skb = skb;
1828 skb_put(skb, len);
1829 }
1830 } else if (!emac_rx_sg_append(dev, slot) &&
1831 (ctrl & MAL_RX_CTRL_LAST)) {
1832
1833 skb = dev->rx_sg_skb;
1834 dev->rx_sg_skb = NULL;
1835
1836 ctrl &= EMAC_BAD_RX_MASK;
1837 if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1838 emac_parse_rx_error(dev, ctrl);
1839 ++dev->estats.rx_dropped_error;
1840 dev_kfree_skb(skb);
1841 len = 0;
1842 } else
1843 goto push_packet;
1844 }
1845 goto skip;
1846 oom:
1847 DBG(dev, "rx OOM %d" NL, slot);
1848 /* Drop the packet and recycle skb */
1849 ++dev->estats.rx_dropped_oom;
1850 emac_recycle_rx_skb(dev, slot, 0);
1851 goto next;
1852 }
1853
1854 if (received) {
1855 DBG2(dev, "rx %d BDs" NL, received);
1856 dev->rx_slot = slot;
1857 }
1858
1859 if (unlikely(budget && test_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags))) {
1860 mb();
1861 if (!(dev->rx_desc[slot].ctrl & MAL_RX_CTRL_EMPTY)) {
1862 DBG2(dev, "rx restart" NL);
1863 received = 0;
1864 goto again;
1865 }
1866
1867 if (dev->rx_sg_skb) {
1868 DBG2(dev, "dropping partial rx packet" NL);
1869 ++dev->estats.rx_dropped_error;
1870 dev_kfree_skb(dev->rx_sg_skb);
1871 dev->rx_sg_skb = NULL;
1872 }
1873
1874 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1875 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1876 emac_rx_enable(dev);
1877 dev->rx_slot = 0;
1878 }
1879 return received;
1880 }
1881
1882 /* NAPI poll context */
emac_peek_rx(void * param)1883 static int emac_peek_rx(void *param)
1884 {
1885 struct emac_instance *dev = param;
1886
1887 return !(dev->rx_desc[dev->rx_slot].ctrl & MAL_RX_CTRL_EMPTY);
1888 }
1889
1890 /* NAPI poll context */
emac_peek_rx_sg(void * param)1891 static int emac_peek_rx_sg(void *param)
1892 {
1893 struct emac_instance *dev = param;
1894
1895 int slot = dev->rx_slot;
1896 while (1) {
1897 u16 ctrl = dev->rx_desc[slot].ctrl;
1898 if (ctrl & MAL_RX_CTRL_EMPTY)
1899 return 0;
1900 else if (ctrl & MAL_RX_CTRL_LAST)
1901 return 1;
1902
1903 slot = (slot + 1) % NUM_RX_BUFF;
1904
1905 /* I'm just being paranoid here :) */
1906 if (unlikely(slot == dev->rx_slot))
1907 return 0;
1908 }
1909 }
1910
1911 /* Hard IRQ */
emac_rxde(void * param)1912 static void emac_rxde(void *param)
1913 {
1914 struct emac_instance *dev = param;
1915
1916 ++dev->estats.rx_stopped;
1917 emac_rx_disable_async(dev);
1918 }
1919
1920 /* Hard IRQ */
emac_irq(int irq,void * dev_instance)1921 static irqreturn_t emac_irq(int irq, void *dev_instance)
1922 {
1923 struct emac_instance *dev = dev_instance;
1924 struct emac_regs __iomem *p = dev->emacp;
1925 struct emac_error_stats *st = &dev->estats;
1926 u32 isr;
1927
1928 spin_lock(&dev->lock);
1929
1930 isr = in_be32(&p->isr);
1931 out_be32(&p->isr, isr);
1932
1933 DBG(dev, "isr = %08x" NL, isr);
1934
1935 if (isr & EMAC4_ISR_TXPE)
1936 ++st->tx_parity;
1937 if (isr & EMAC4_ISR_RXPE)
1938 ++st->rx_parity;
1939 if (isr & EMAC4_ISR_TXUE)
1940 ++st->tx_underrun;
1941 if (isr & EMAC4_ISR_RXOE)
1942 ++st->rx_fifo_overrun;
1943 if (isr & EMAC_ISR_OVR)
1944 ++st->rx_overrun;
1945 if (isr & EMAC_ISR_BP)
1946 ++st->rx_bad_packet;
1947 if (isr & EMAC_ISR_RP)
1948 ++st->rx_runt_packet;
1949 if (isr & EMAC_ISR_SE)
1950 ++st->rx_short_event;
1951 if (isr & EMAC_ISR_ALE)
1952 ++st->rx_alignment_error;
1953 if (isr & EMAC_ISR_BFCS)
1954 ++st->rx_bad_fcs;
1955 if (isr & EMAC_ISR_PTLE)
1956 ++st->rx_packet_too_long;
1957 if (isr & EMAC_ISR_ORE)
1958 ++st->rx_out_of_range;
1959 if (isr & EMAC_ISR_IRE)
1960 ++st->rx_in_range;
1961 if (isr & EMAC_ISR_SQE)
1962 ++st->tx_sqe;
1963 if (isr & EMAC_ISR_TE)
1964 ++st->tx_errors;
1965
1966 spin_unlock(&dev->lock);
1967
1968 return IRQ_HANDLED;
1969 }
1970
emac_stats(struct net_device * ndev)1971 static struct net_device_stats *emac_stats(struct net_device *ndev)
1972 {
1973 struct emac_instance *dev = netdev_priv(ndev);
1974 struct emac_stats *st = &dev->stats;
1975 struct emac_error_stats *est = &dev->estats;
1976 struct net_device_stats *nst = &ndev->stats;
1977 unsigned long flags;
1978
1979 DBG2(dev, "stats" NL);
1980
1981 /* Compute "legacy" statistics */
1982 spin_lock_irqsave(&dev->lock, flags);
1983 nst->rx_packets = (unsigned long)st->rx_packets;
1984 nst->rx_bytes = (unsigned long)st->rx_bytes;
1985 nst->tx_packets = (unsigned long)st->tx_packets;
1986 nst->tx_bytes = (unsigned long)st->tx_bytes;
1987 nst->rx_dropped = (unsigned long)(est->rx_dropped_oom +
1988 est->rx_dropped_error +
1989 est->rx_dropped_resize +
1990 est->rx_dropped_mtu);
1991 nst->tx_dropped = (unsigned long)est->tx_dropped;
1992
1993 nst->rx_errors = (unsigned long)est->rx_bd_errors;
1994 nst->rx_fifo_errors = (unsigned long)(est->rx_bd_overrun +
1995 est->rx_fifo_overrun +
1996 est->rx_overrun);
1997 nst->rx_frame_errors = (unsigned long)(est->rx_bd_alignment_error +
1998 est->rx_alignment_error);
1999 nst->rx_crc_errors = (unsigned long)(est->rx_bd_bad_fcs +
2000 est->rx_bad_fcs);
2001 nst->rx_length_errors = (unsigned long)(est->rx_bd_runt_packet +
2002 est->rx_bd_short_event +
2003 est->rx_bd_packet_too_long +
2004 est->rx_bd_out_of_range +
2005 est->rx_bd_in_range +
2006 est->rx_runt_packet +
2007 est->rx_short_event +
2008 est->rx_packet_too_long +
2009 est->rx_out_of_range +
2010 est->rx_in_range);
2011
2012 nst->tx_errors = (unsigned long)(est->tx_bd_errors + est->tx_errors);
2013 nst->tx_fifo_errors = (unsigned long)(est->tx_bd_underrun +
2014 est->tx_underrun);
2015 nst->tx_carrier_errors = (unsigned long)est->tx_bd_carrier_loss;
2016 nst->collisions = (unsigned long)(est->tx_bd_excessive_deferral +
2017 est->tx_bd_excessive_collisions +
2018 est->tx_bd_late_collision +
2019 est->tx_bd_multple_collisions);
2020 spin_unlock_irqrestore(&dev->lock, flags);
2021 return nst;
2022 }
2023
2024 static struct mal_commac_ops emac_commac_ops = {
2025 .poll_tx = &emac_poll_tx,
2026 .poll_rx = &emac_poll_rx,
2027 .peek_rx = &emac_peek_rx,
2028 .rxde = &emac_rxde,
2029 };
2030
2031 static struct mal_commac_ops emac_commac_sg_ops = {
2032 .poll_tx = &emac_poll_tx,
2033 .poll_rx = &emac_poll_rx,
2034 .peek_rx = &emac_peek_rx_sg,
2035 .rxde = &emac_rxde,
2036 };
2037
2038 /* Ethtool support */
emac_ethtool_get_link_ksettings(struct net_device * ndev,struct ethtool_link_ksettings * cmd)2039 static int emac_ethtool_get_link_ksettings(struct net_device *ndev,
2040 struct ethtool_link_ksettings *cmd)
2041 {
2042 struct emac_instance *dev = netdev_priv(ndev);
2043 u32 supported, advertising;
2044
2045 supported = dev->phy.features;
2046 cmd->base.port = PORT_MII;
2047 cmd->base.phy_address = dev->phy.address;
2048
2049 mutex_lock(&dev->link_lock);
2050 advertising = dev->phy.advertising;
2051 cmd->base.autoneg = dev->phy.autoneg;
2052 cmd->base.speed = dev->phy.speed;
2053 cmd->base.duplex = dev->phy.duplex;
2054 mutex_unlock(&dev->link_lock);
2055
2056 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
2057 supported);
2058 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
2059 advertising);
2060
2061 return 0;
2062 }
2063
2064 static int
emac_ethtool_set_link_ksettings(struct net_device * ndev,const struct ethtool_link_ksettings * cmd)2065 emac_ethtool_set_link_ksettings(struct net_device *ndev,
2066 const struct ethtool_link_ksettings *cmd)
2067 {
2068 struct emac_instance *dev = netdev_priv(ndev);
2069 u32 f = dev->phy.features;
2070 u32 advertising;
2071
2072 ethtool_convert_link_mode_to_legacy_u32(&advertising,
2073 cmd->link_modes.advertising);
2074
2075 DBG(dev, "set_settings(%d, %d, %d, 0x%08x)" NL,
2076 cmd->base.autoneg, cmd->base.speed, cmd->base.duplex, advertising);
2077
2078 /* Basic sanity checks */
2079 if (dev->phy.address < 0)
2080 return -EOPNOTSUPP;
2081 if (cmd->base.autoneg != AUTONEG_ENABLE &&
2082 cmd->base.autoneg != AUTONEG_DISABLE)
2083 return -EINVAL;
2084 if (cmd->base.autoneg == AUTONEG_ENABLE && advertising == 0)
2085 return -EINVAL;
2086 if (cmd->base.duplex != DUPLEX_HALF && cmd->base.duplex != DUPLEX_FULL)
2087 return -EINVAL;
2088
2089 if (cmd->base.autoneg == AUTONEG_DISABLE) {
2090 switch (cmd->base.speed) {
2091 case SPEED_10:
2092 if (cmd->base.duplex == DUPLEX_HALF &&
2093 !(f & SUPPORTED_10baseT_Half))
2094 return -EINVAL;
2095 if (cmd->base.duplex == DUPLEX_FULL &&
2096 !(f & SUPPORTED_10baseT_Full))
2097 return -EINVAL;
2098 break;
2099 case SPEED_100:
2100 if (cmd->base.duplex == DUPLEX_HALF &&
2101 !(f & SUPPORTED_100baseT_Half))
2102 return -EINVAL;
2103 if (cmd->base.duplex == DUPLEX_FULL &&
2104 !(f & SUPPORTED_100baseT_Full))
2105 return -EINVAL;
2106 break;
2107 case SPEED_1000:
2108 if (cmd->base.duplex == DUPLEX_HALF &&
2109 !(f & SUPPORTED_1000baseT_Half))
2110 return -EINVAL;
2111 if (cmd->base.duplex == DUPLEX_FULL &&
2112 !(f & SUPPORTED_1000baseT_Full))
2113 return -EINVAL;
2114 break;
2115 default:
2116 return -EINVAL;
2117 }
2118
2119 mutex_lock(&dev->link_lock);
2120 dev->phy.def->ops->setup_forced(&dev->phy, cmd->base.speed,
2121 cmd->base.duplex);
2122 mutex_unlock(&dev->link_lock);
2123
2124 } else {
2125 if (!(f & SUPPORTED_Autoneg))
2126 return -EINVAL;
2127
2128 mutex_lock(&dev->link_lock);
2129 dev->phy.def->ops->setup_aneg(&dev->phy,
2130 (advertising & f) |
2131 (dev->phy.advertising &
2132 (ADVERTISED_Pause |
2133 ADVERTISED_Asym_Pause)));
2134 mutex_unlock(&dev->link_lock);
2135 }
2136 emac_force_link_update(dev);
2137
2138 return 0;
2139 }
2140
2141 static void
emac_ethtool_get_ringparam(struct net_device * ndev,struct ethtool_ringparam * rp,struct kernel_ethtool_ringparam * kernel_rp,struct netlink_ext_ack * extack)2142 emac_ethtool_get_ringparam(struct net_device *ndev,
2143 struct ethtool_ringparam *rp,
2144 struct kernel_ethtool_ringparam *kernel_rp,
2145 struct netlink_ext_ack *extack)
2146 {
2147 rp->rx_max_pending = rp->rx_pending = NUM_RX_BUFF;
2148 rp->tx_max_pending = rp->tx_pending = NUM_TX_BUFF;
2149 }
2150
emac_ethtool_get_pauseparam(struct net_device * ndev,struct ethtool_pauseparam * pp)2151 static void emac_ethtool_get_pauseparam(struct net_device *ndev,
2152 struct ethtool_pauseparam *pp)
2153 {
2154 struct emac_instance *dev = netdev_priv(ndev);
2155
2156 mutex_lock(&dev->link_lock);
2157 if ((dev->phy.features & SUPPORTED_Autoneg) &&
2158 (dev->phy.advertising & (ADVERTISED_Pause | ADVERTISED_Asym_Pause)))
2159 pp->autoneg = 1;
2160
2161 if (dev->phy.duplex == DUPLEX_FULL) {
2162 if (dev->phy.pause)
2163 pp->rx_pause = pp->tx_pause = 1;
2164 else if (dev->phy.asym_pause)
2165 pp->tx_pause = 1;
2166 }
2167 mutex_unlock(&dev->link_lock);
2168 }
2169
emac_get_regs_len(struct emac_instance * dev)2170 static int emac_get_regs_len(struct emac_instance *dev)
2171 {
2172 return sizeof(struct emac_ethtool_regs_subhdr) +
2173 sizeof(struct emac_regs);
2174 }
2175
emac_ethtool_get_regs_len(struct net_device * ndev)2176 static int emac_ethtool_get_regs_len(struct net_device *ndev)
2177 {
2178 struct emac_instance *dev = netdev_priv(ndev);
2179 int size;
2180
2181 size = sizeof(struct emac_ethtool_regs_hdr) +
2182 emac_get_regs_len(dev) + mal_get_regs_len(dev->mal);
2183 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
2184 size += zmii_get_regs_len(dev->zmii_dev);
2185 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
2186 size += rgmii_get_regs_len(dev->rgmii_dev);
2187 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
2188 size += tah_get_regs_len(dev->tah_dev);
2189
2190 return size;
2191 }
2192
emac_dump_regs(struct emac_instance * dev,void * buf)2193 static void *emac_dump_regs(struct emac_instance *dev, void *buf)
2194 {
2195 struct emac_ethtool_regs_subhdr *hdr = buf;
2196
2197 hdr->index = dev->cell_index;
2198 if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {
2199 hdr->version = EMAC4SYNC_ETHTOOL_REGS_VER;
2200 } else if (emac_has_feature(dev, EMAC_FTR_EMAC4)) {
2201 hdr->version = EMAC4_ETHTOOL_REGS_VER;
2202 } else {
2203 hdr->version = EMAC_ETHTOOL_REGS_VER;
2204 }
2205 memcpy_fromio(hdr + 1, dev->emacp, sizeof(struct emac_regs));
2206 return (void *)(hdr + 1) + sizeof(struct emac_regs);
2207 }
2208
emac_ethtool_get_regs(struct net_device * ndev,struct ethtool_regs * regs,void * buf)2209 static void emac_ethtool_get_regs(struct net_device *ndev,
2210 struct ethtool_regs *regs, void *buf)
2211 {
2212 struct emac_instance *dev = netdev_priv(ndev);
2213 struct emac_ethtool_regs_hdr *hdr = buf;
2214
2215 hdr->components = 0;
2216 buf = hdr + 1;
2217
2218 buf = mal_dump_regs(dev->mal, buf);
2219 buf = emac_dump_regs(dev, buf);
2220 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII)) {
2221 hdr->components |= EMAC_ETHTOOL_REGS_ZMII;
2222 buf = zmii_dump_regs(dev->zmii_dev, buf);
2223 }
2224 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII)) {
2225 hdr->components |= EMAC_ETHTOOL_REGS_RGMII;
2226 buf = rgmii_dump_regs(dev->rgmii_dev, buf);
2227 }
2228 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH)) {
2229 hdr->components |= EMAC_ETHTOOL_REGS_TAH;
2230 buf = tah_dump_regs(dev->tah_dev, buf);
2231 }
2232 }
2233
emac_ethtool_nway_reset(struct net_device * ndev)2234 static int emac_ethtool_nway_reset(struct net_device *ndev)
2235 {
2236 struct emac_instance *dev = netdev_priv(ndev);
2237 int res = 0;
2238
2239 DBG(dev, "nway_reset" NL);
2240
2241 if (dev->phy.address < 0)
2242 return -EOPNOTSUPP;
2243
2244 mutex_lock(&dev->link_lock);
2245 if (!dev->phy.autoneg) {
2246 res = -EINVAL;
2247 goto out;
2248 }
2249
2250 dev->phy.def->ops->setup_aneg(&dev->phy, dev->phy.advertising);
2251 out:
2252 mutex_unlock(&dev->link_lock);
2253 emac_force_link_update(dev);
2254 return res;
2255 }
2256
emac_ethtool_get_sset_count(struct net_device * ndev,int stringset)2257 static int emac_ethtool_get_sset_count(struct net_device *ndev, int stringset)
2258 {
2259 if (stringset == ETH_SS_STATS)
2260 return EMAC_ETHTOOL_STATS_COUNT;
2261 else
2262 return -EINVAL;
2263 }
2264
emac_ethtool_get_strings(struct net_device * ndev,u32 stringset,u8 * buf)2265 static void emac_ethtool_get_strings(struct net_device *ndev, u32 stringset,
2266 u8 * buf)
2267 {
2268 if (stringset == ETH_SS_STATS)
2269 memcpy(buf, &emac_stats_keys, sizeof(emac_stats_keys));
2270 }
2271
emac_ethtool_get_ethtool_stats(struct net_device * ndev,struct ethtool_stats * estats,u64 * tmp_stats)2272 static void emac_ethtool_get_ethtool_stats(struct net_device *ndev,
2273 struct ethtool_stats *estats,
2274 u64 * tmp_stats)
2275 {
2276 struct emac_instance *dev = netdev_priv(ndev);
2277
2278 memcpy(tmp_stats, &dev->stats, sizeof(dev->stats));
2279 tmp_stats += sizeof(dev->stats) / sizeof(u64);
2280 memcpy(tmp_stats, &dev->estats, sizeof(dev->estats));
2281 }
2282
emac_ethtool_get_drvinfo(struct net_device * ndev,struct ethtool_drvinfo * info)2283 static void emac_ethtool_get_drvinfo(struct net_device *ndev,
2284 struct ethtool_drvinfo *info)
2285 {
2286 struct emac_instance *dev = netdev_priv(ndev);
2287
2288 strscpy(info->driver, "ibm_emac", sizeof(info->driver));
2289 strscpy(info->version, DRV_VERSION, sizeof(info->version));
2290 snprintf(info->bus_info, sizeof(info->bus_info), "PPC 4xx EMAC-%d %pOF",
2291 dev->cell_index, dev->ofdev->dev.of_node);
2292 }
2293
2294 static const struct ethtool_ops emac_ethtool_ops = {
2295 .get_drvinfo = emac_ethtool_get_drvinfo,
2296
2297 .get_regs_len = emac_ethtool_get_regs_len,
2298 .get_regs = emac_ethtool_get_regs,
2299
2300 .nway_reset = emac_ethtool_nway_reset,
2301
2302 .get_ringparam = emac_ethtool_get_ringparam,
2303 .get_pauseparam = emac_ethtool_get_pauseparam,
2304
2305 .get_strings = emac_ethtool_get_strings,
2306 .get_sset_count = emac_ethtool_get_sset_count,
2307 .get_ethtool_stats = emac_ethtool_get_ethtool_stats,
2308
2309 .get_link = ethtool_op_get_link,
2310 .get_link_ksettings = emac_ethtool_get_link_ksettings,
2311 .set_link_ksettings = emac_ethtool_set_link_ksettings,
2312 };
2313
emac_ioctl(struct net_device * ndev,struct ifreq * rq,int cmd)2314 static int emac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
2315 {
2316 struct emac_instance *dev = netdev_priv(ndev);
2317 struct mii_ioctl_data *data = if_mii(rq);
2318
2319 DBG(dev, "ioctl %08x" NL, cmd);
2320
2321 if (dev->phy.address < 0)
2322 return -EOPNOTSUPP;
2323
2324 switch (cmd) {
2325 case SIOCGMIIPHY:
2326 data->phy_id = dev->phy.address;
2327 fallthrough;
2328 case SIOCGMIIREG:
2329 data->val_out = emac_mdio_read(ndev, dev->phy.address,
2330 data->reg_num);
2331 return 0;
2332
2333 case SIOCSMIIREG:
2334 emac_mdio_write(ndev, dev->phy.address, data->reg_num,
2335 data->val_in);
2336 return 0;
2337 default:
2338 return -EOPNOTSUPP;
2339 }
2340 }
2341
2342 struct emac_depentry {
2343 u32 phandle;
2344 struct device_node *node;
2345 struct platform_device *ofdev;
2346 void *drvdata;
2347 };
2348
2349 #define EMAC_DEP_MAL_IDX 0
2350 #define EMAC_DEP_ZMII_IDX 1
2351 #define EMAC_DEP_RGMII_IDX 2
2352 #define EMAC_DEP_TAH_IDX 3
2353 #define EMAC_DEP_MDIO_IDX 4
2354 #define EMAC_DEP_PREV_IDX 5
2355 #define EMAC_DEP_COUNT 6
2356
emac_check_deps(struct emac_instance * dev,struct emac_depentry * deps)2357 static int emac_check_deps(struct emac_instance *dev,
2358 struct emac_depentry *deps)
2359 {
2360 int i, there = 0;
2361 struct device_node *np;
2362
2363 for (i = 0; i < EMAC_DEP_COUNT; i++) {
2364 /* no dependency on that item, allright */
2365 if (deps[i].phandle == 0) {
2366 there++;
2367 continue;
2368 }
2369 /* special case for blist as the dependency might go away */
2370 if (i == EMAC_DEP_PREV_IDX) {
2371 np = *(dev->blist - 1);
2372 if (np == NULL) {
2373 deps[i].phandle = 0;
2374 there++;
2375 continue;
2376 }
2377 if (deps[i].node == NULL)
2378 deps[i].node = of_node_get(np);
2379 }
2380 if (deps[i].node == NULL)
2381 deps[i].node = of_find_node_by_phandle(deps[i].phandle);
2382 if (deps[i].node == NULL)
2383 continue;
2384 if (deps[i].ofdev == NULL)
2385 deps[i].ofdev = of_find_device_by_node(deps[i].node);
2386 if (deps[i].ofdev == NULL)
2387 continue;
2388 if (deps[i].drvdata == NULL)
2389 deps[i].drvdata = platform_get_drvdata(deps[i].ofdev);
2390 if (deps[i].drvdata != NULL)
2391 there++;
2392 }
2393 return there == EMAC_DEP_COUNT;
2394 }
2395
emac_put_deps(struct emac_instance * dev)2396 static void emac_put_deps(struct emac_instance *dev)
2397 {
2398 platform_device_put(dev->mal_dev);
2399 platform_device_put(dev->zmii_dev);
2400 platform_device_put(dev->rgmii_dev);
2401 platform_device_put(dev->mdio_dev);
2402 platform_device_put(dev->tah_dev);
2403 }
2404
emac_of_bus_notify(struct notifier_block * nb,unsigned long action,void * data)2405 static int emac_of_bus_notify(struct notifier_block *nb, unsigned long action,
2406 void *data)
2407 {
2408 /* We are only intereted in device addition */
2409 if (action == BUS_NOTIFY_BOUND_DRIVER)
2410 wake_up_all(&emac_probe_wait);
2411 return 0;
2412 }
2413
2414 static struct notifier_block emac_of_bus_notifier = {
2415 .notifier_call = emac_of_bus_notify
2416 };
2417
emac_wait_deps(struct emac_instance * dev)2418 static int emac_wait_deps(struct emac_instance *dev)
2419 {
2420 struct emac_depentry deps[EMAC_DEP_COUNT];
2421 int i, err;
2422
2423 memset(&deps, 0, sizeof(deps));
2424
2425 deps[EMAC_DEP_MAL_IDX].phandle = dev->mal_ph;
2426 deps[EMAC_DEP_ZMII_IDX].phandle = dev->zmii_ph;
2427 deps[EMAC_DEP_RGMII_IDX].phandle = dev->rgmii_ph;
2428 if (dev->tah_ph)
2429 deps[EMAC_DEP_TAH_IDX].phandle = dev->tah_ph;
2430 if (dev->mdio_ph)
2431 deps[EMAC_DEP_MDIO_IDX].phandle = dev->mdio_ph;
2432 if (dev->blist && dev->blist > emac_boot_list)
2433 deps[EMAC_DEP_PREV_IDX].phandle = 0xffffffffu;
2434 bus_register_notifier(&platform_bus_type, &emac_of_bus_notifier);
2435 wait_event_timeout(emac_probe_wait,
2436 emac_check_deps(dev, deps),
2437 EMAC_PROBE_DEP_TIMEOUT);
2438 bus_unregister_notifier(&platform_bus_type, &emac_of_bus_notifier);
2439 err = emac_check_deps(dev, deps) ? 0 : -ENODEV;
2440 for (i = 0; i < EMAC_DEP_COUNT; i++) {
2441 of_node_put(deps[i].node);
2442 if (err)
2443 platform_device_put(deps[i].ofdev);
2444 }
2445 if (err == 0) {
2446 dev->mal_dev = deps[EMAC_DEP_MAL_IDX].ofdev;
2447 dev->zmii_dev = deps[EMAC_DEP_ZMII_IDX].ofdev;
2448 dev->rgmii_dev = deps[EMAC_DEP_RGMII_IDX].ofdev;
2449 dev->tah_dev = deps[EMAC_DEP_TAH_IDX].ofdev;
2450 dev->mdio_dev = deps[EMAC_DEP_MDIO_IDX].ofdev;
2451 }
2452 platform_device_put(deps[EMAC_DEP_PREV_IDX].ofdev);
2453 return err;
2454 }
2455
emac_read_uint_prop(struct device_node * np,const char * name,u32 * val,int fatal)2456 static int emac_read_uint_prop(struct device_node *np, const char *name,
2457 u32 *val, int fatal)
2458 {
2459 int len;
2460 const u32 *prop = of_get_property(np, name, &len);
2461 if (prop == NULL || len < sizeof(u32)) {
2462 if (fatal)
2463 printk(KERN_ERR "%pOF: missing %s property\n",
2464 np, name);
2465 return -ENODEV;
2466 }
2467 *val = *prop;
2468 return 0;
2469 }
2470
emac_adjust_link(struct net_device * ndev)2471 static void emac_adjust_link(struct net_device *ndev)
2472 {
2473 struct emac_instance *dev = netdev_priv(ndev);
2474 struct phy_device *phy = dev->phy_dev;
2475
2476 dev->phy.autoneg = phy->autoneg;
2477 dev->phy.speed = phy->speed;
2478 dev->phy.duplex = phy->duplex;
2479 dev->phy.pause = phy->pause;
2480 dev->phy.asym_pause = phy->asym_pause;
2481 ethtool_convert_link_mode_to_legacy_u32(&dev->phy.advertising,
2482 phy->advertising);
2483 }
2484
emac_mii_bus_read(struct mii_bus * bus,int addr,int regnum)2485 static int emac_mii_bus_read(struct mii_bus *bus, int addr, int regnum)
2486 {
2487 int ret = emac_mdio_read(bus->priv, addr, regnum);
2488 /* This is a workaround for powered down ports/phys.
2489 * In the wild, this was seen on the Cisco Meraki MX60(W).
2490 * This hardware disables ports as part of the handoff
2491 * procedure. Accessing the ports will lead to errors
2492 * (-ETIMEDOUT, -EREMOTEIO) that do more harm than good.
2493 */
2494 return ret < 0 ? 0xffff : ret;
2495 }
2496
emac_mii_bus_write(struct mii_bus * bus,int addr,int regnum,u16 val)2497 static int emac_mii_bus_write(struct mii_bus *bus, int addr,
2498 int regnum, u16 val)
2499 {
2500 emac_mdio_write(bus->priv, addr, regnum, val);
2501 return 0;
2502 }
2503
emac_mii_bus_reset(struct mii_bus * bus)2504 static int emac_mii_bus_reset(struct mii_bus *bus)
2505 {
2506 struct emac_instance *dev = netdev_priv(bus->priv);
2507
2508 return emac_reset(dev);
2509 }
2510
emac_mdio_phy_start_aneg(struct mii_phy * phy,struct phy_device * phy_dev)2511 static int emac_mdio_phy_start_aneg(struct mii_phy *phy,
2512 struct phy_device *phy_dev)
2513 {
2514 phy_dev->autoneg = phy->autoneg;
2515 phy_dev->speed = phy->speed;
2516 phy_dev->duplex = phy->duplex;
2517 ethtool_convert_legacy_u32_to_link_mode(phy_dev->advertising,
2518 phy->advertising);
2519 return phy_start_aneg(phy_dev);
2520 }
2521
emac_mdio_setup_aneg(struct mii_phy * phy,u32 advertise)2522 static int emac_mdio_setup_aneg(struct mii_phy *phy, u32 advertise)
2523 {
2524 struct net_device *ndev = phy->dev;
2525 struct emac_instance *dev = netdev_priv(ndev);
2526
2527 phy->autoneg = AUTONEG_ENABLE;
2528 phy->advertising = advertise;
2529 return emac_mdio_phy_start_aneg(phy, dev->phy_dev);
2530 }
2531
emac_mdio_setup_forced(struct mii_phy * phy,int speed,int fd)2532 static int emac_mdio_setup_forced(struct mii_phy *phy, int speed, int fd)
2533 {
2534 struct net_device *ndev = phy->dev;
2535 struct emac_instance *dev = netdev_priv(ndev);
2536
2537 phy->autoneg = AUTONEG_DISABLE;
2538 phy->speed = speed;
2539 phy->duplex = fd;
2540 return emac_mdio_phy_start_aneg(phy, dev->phy_dev);
2541 }
2542
emac_mdio_poll_link(struct mii_phy * phy)2543 static int emac_mdio_poll_link(struct mii_phy *phy)
2544 {
2545 struct net_device *ndev = phy->dev;
2546 struct emac_instance *dev = netdev_priv(ndev);
2547 int res;
2548
2549 res = phy_read_status(dev->phy_dev);
2550 if (res) {
2551 dev_err(&dev->ofdev->dev, "link update failed (%d).", res);
2552 return ethtool_op_get_link(ndev);
2553 }
2554
2555 return dev->phy_dev->link;
2556 }
2557
emac_mdio_read_link(struct mii_phy * phy)2558 static int emac_mdio_read_link(struct mii_phy *phy)
2559 {
2560 struct net_device *ndev = phy->dev;
2561 struct emac_instance *dev = netdev_priv(ndev);
2562 struct phy_device *phy_dev = dev->phy_dev;
2563 int res;
2564
2565 res = phy_read_status(phy_dev);
2566 if (res)
2567 return res;
2568
2569 phy->speed = phy_dev->speed;
2570 phy->duplex = phy_dev->duplex;
2571 phy->pause = phy_dev->pause;
2572 phy->asym_pause = phy_dev->asym_pause;
2573 return 0;
2574 }
2575
emac_mdio_init_phy(struct mii_phy * phy)2576 static int emac_mdio_init_phy(struct mii_phy *phy)
2577 {
2578 struct net_device *ndev = phy->dev;
2579 struct emac_instance *dev = netdev_priv(ndev);
2580
2581 phy_start(dev->phy_dev);
2582 return phy_init_hw(dev->phy_dev);
2583 }
2584
2585 static const struct mii_phy_ops emac_dt_mdio_phy_ops = {
2586 .init = emac_mdio_init_phy,
2587 .setup_aneg = emac_mdio_setup_aneg,
2588 .setup_forced = emac_mdio_setup_forced,
2589 .poll_link = emac_mdio_poll_link,
2590 .read_link = emac_mdio_read_link,
2591 };
2592
emac_dt_mdio_probe(struct emac_instance * dev)2593 static int emac_dt_mdio_probe(struct emac_instance *dev)
2594 {
2595 struct device_node *mii_np;
2596 int res;
2597
2598 mii_np = of_get_child_by_name(dev->ofdev->dev.of_node, "mdio");
2599 if (!mii_np) {
2600 dev_err(&dev->ofdev->dev, "no mdio definition found.");
2601 return -ENODEV;
2602 }
2603
2604 if (!of_device_is_available(mii_np)) {
2605 res = -ENODEV;
2606 goto put_node;
2607 }
2608
2609 dev->mii_bus = devm_mdiobus_alloc(&dev->ofdev->dev);
2610 if (!dev->mii_bus) {
2611 res = -ENOMEM;
2612 goto put_node;
2613 }
2614
2615 dev->mii_bus->priv = dev->ndev;
2616 dev->mii_bus->parent = dev->ndev->dev.parent;
2617 dev->mii_bus->name = "emac_mdio";
2618 dev->mii_bus->read = &emac_mii_bus_read;
2619 dev->mii_bus->write = &emac_mii_bus_write;
2620 dev->mii_bus->reset = &emac_mii_bus_reset;
2621 snprintf(dev->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev->ofdev->name);
2622 res = of_mdiobus_register(dev->mii_bus, mii_np);
2623 if (res) {
2624 dev_err(&dev->ofdev->dev, "cannot register MDIO bus %s (%d)",
2625 dev->mii_bus->name, res);
2626 }
2627
2628 put_node:
2629 of_node_put(mii_np);
2630 return res;
2631 }
2632
emac_dt_phy_connect(struct emac_instance * dev,struct device_node * phy_handle)2633 static int emac_dt_phy_connect(struct emac_instance *dev,
2634 struct device_node *phy_handle)
2635 {
2636 dev->phy.def = devm_kzalloc(&dev->ofdev->dev, sizeof(*dev->phy.def),
2637 GFP_KERNEL);
2638 if (!dev->phy.def)
2639 return -ENOMEM;
2640
2641 dev->phy_dev = of_phy_connect(dev->ndev, phy_handle, &emac_adjust_link,
2642 0, dev->phy_mode);
2643 if (!dev->phy_dev) {
2644 dev_err(&dev->ofdev->dev, "failed to connect to PHY.\n");
2645 return -ENODEV;
2646 }
2647
2648 dev->phy.def->phy_id = dev->phy_dev->drv->phy_id;
2649 dev->phy.def->phy_id_mask = dev->phy_dev->drv->phy_id_mask;
2650 dev->phy.def->name = dev->phy_dev->drv->name;
2651 dev->phy.def->ops = &emac_dt_mdio_phy_ops;
2652 ethtool_convert_link_mode_to_legacy_u32(&dev->phy.features,
2653 dev->phy_dev->supported);
2654 dev->phy.address = dev->phy_dev->mdio.addr;
2655 dev->phy.mode = dev->phy_dev->interface;
2656 return 0;
2657 }
2658
emac_dt_phy_probe(struct emac_instance * dev)2659 static int emac_dt_phy_probe(struct emac_instance *dev)
2660 {
2661 struct device_node *np = dev->ofdev->dev.of_node;
2662 struct device_node *phy_handle;
2663 int res = 1;
2664
2665 phy_handle = of_parse_phandle(np, "phy-handle", 0);
2666
2667 if (phy_handle) {
2668 res = emac_dt_mdio_probe(dev);
2669 if (!res) {
2670 res = emac_dt_phy_connect(dev, phy_handle);
2671 if (res)
2672 mdiobus_unregister(dev->mii_bus);
2673 }
2674 }
2675
2676 of_node_put(phy_handle);
2677 return res;
2678 }
2679
emac_init_phy(struct emac_instance * dev)2680 static int emac_init_phy(struct emac_instance *dev)
2681 {
2682 struct device_node *np = dev->ofdev->dev.of_node;
2683 struct net_device *ndev = dev->ndev;
2684 u32 phy_map, adv;
2685 int i;
2686
2687 dev->phy.dev = ndev;
2688 dev->phy.mode = dev->phy_mode;
2689
2690 /* PHY-less configuration. */
2691 if ((dev->phy_address == 0xffffffff && dev->phy_map == 0xffffffff) ||
2692 of_phy_is_fixed_link(np)) {
2693 emac_reset(dev);
2694
2695 /* PHY-less configuration. */
2696 dev->phy.address = -1;
2697 dev->phy.features = SUPPORTED_MII;
2698 if (emac_phy_supports_gige(dev->phy_mode))
2699 dev->phy.features |= SUPPORTED_1000baseT_Full;
2700 else
2701 dev->phy.features |= SUPPORTED_100baseT_Full;
2702 dev->phy.pause = 1;
2703
2704 if (of_phy_is_fixed_link(np)) {
2705 int res = emac_dt_mdio_probe(dev);
2706
2707 if (res)
2708 return res;
2709
2710 res = of_phy_register_fixed_link(np);
2711 dev->phy_dev = of_phy_find_device(np);
2712 if (res || !dev->phy_dev) {
2713 mdiobus_unregister(dev->mii_bus);
2714 return res ? res : -EINVAL;
2715 }
2716 emac_adjust_link(dev->ndev);
2717 put_device(&dev->phy_dev->mdio.dev);
2718 }
2719 return 0;
2720 }
2721
2722 mutex_lock(&emac_phy_map_lock);
2723 phy_map = dev->phy_map | busy_phy_map;
2724
2725 DBG(dev, "PHY maps %08x %08x" NL, dev->phy_map, busy_phy_map);
2726
2727 dev->phy.mdio_read = emac_mdio_read;
2728 dev->phy.mdio_write = emac_mdio_write;
2729
2730 /* Enable internal clock source */
2731 #ifdef CONFIG_PPC_DCR_NATIVE
2732 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2733 dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
2734 #endif
2735 /* PHY clock workaround */
2736 emac_rx_clk_tx(dev);
2737
2738 /* Enable internal clock source on 440GX*/
2739 #ifdef CONFIG_PPC_DCR_NATIVE
2740 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2741 dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
2742 #endif
2743 /* Configure EMAC with defaults so we can at least use MDIO
2744 * This is needed mostly for 440GX
2745 */
2746 if (emac_phy_gpcs(dev->phy.mode)) {
2747 /* XXX
2748 * Make GPCS PHY address equal to EMAC index.
2749 * We probably should take into account busy_phy_map
2750 * and/or phy_map here.
2751 *
2752 * Note that the busy_phy_map is currently global
2753 * while it should probably be per-ASIC...
2754 */
2755 dev->phy.gpcs_address = dev->gpcs_address;
2756 if (dev->phy.gpcs_address == 0xffffffff)
2757 dev->phy.address = dev->cell_index;
2758 }
2759
2760 emac_configure(dev);
2761
2762 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII)) {
2763 int res = emac_dt_phy_probe(dev);
2764
2765 switch (res) {
2766 case 1:
2767 /* No phy-handle property configured.
2768 * Continue with the existing phy probe
2769 * and setup code.
2770 */
2771 break;
2772
2773 case 0:
2774 mutex_unlock(&emac_phy_map_lock);
2775 goto init_phy;
2776
2777 default:
2778 mutex_unlock(&emac_phy_map_lock);
2779 dev_err(&dev->ofdev->dev, "failed to attach dt phy (%d).\n",
2780 res);
2781 return res;
2782 }
2783 }
2784
2785 if (dev->phy_address != 0xffffffff)
2786 phy_map = ~(1 << dev->phy_address);
2787
2788 for (i = 0; i < 0x20; phy_map >>= 1, ++i)
2789 if (!(phy_map & 1)) {
2790 int r;
2791 busy_phy_map |= 1 << i;
2792
2793 /* Quick check if there is a PHY at the address */
2794 r = emac_mdio_read(dev->ndev, i, MII_BMCR);
2795 if (r == 0xffff || r < 0)
2796 continue;
2797 if (!emac_mii_phy_probe(&dev->phy, i))
2798 break;
2799 }
2800
2801 /* Enable external clock source */
2802 #ifdef CONFIG_PPC_DCR_NATIVE
2803 if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2804 dcri_clrset(SDR0, SDR0_MFR, SDR0_MFR_ECS, 0);
2805 #endif
2806 mutex_unlock(&emac_phy_map_lock);
2807 if (i == 0x20) {
2808 printk(KERN_WARNING "%pOF: can't find PHY!\n", np);
2809 return -ENXIO;
2810 }
2811
2812 init_phy:
2813 /* Init PHY */
2814 if (dev->phy.def->ops->init)
2815 dev->phy.def->ops->init(&dev->phy);
2816
2817 /* Disable any PHY features not supported by the platform */
2818 dev->phy.def->features &= ~dev->phy_feat_exc;
2819 dev->phy.features &= ~dev->phy_feat_exc;
2820
2821 /* Setup initial link parameters */
2822 if (dev->phy.features & SUPPORTED_Autoneg) {
2823 adv = dev->phy.features;
2824 if (!emac_has_feature(dev, EMAC_FTR_NO_FLOW_CONTROL_40x))
2825 adv |= ADVERTISED_Pause | ADVERTISED_Asym_Pause;
2826 /* Restart autonegotiation */
2827 dev->phy.def->ops->setup_aneg(&dev->phy, adv);
2828 } else {
2829 u32 f = dev->phy.def->features;
2830 int speed = SPEED_10, fd = DUPLEX_HALF;
2831
2832 /* Select highest supported speed/duplex */
2833 if (f & SUPPORTED_1000baseT_Full) {
2834 speed = SPEED_1000;
2835 fd = DUPLEX_FULL;
2836 } else if (f & SUPPORTED_1000baseT_Half)
2837 speed = SPEED_1000;
2838 else if (f & SUPPORTED_100baseT_Full) {
2839 speed = SPEED_100;
2840 fd = DUPLEX_FULL;
2841 } else if (f & SUPPORTED_100baseT_Half)
2842 speed = SPEED_100;
2843 else if (f & SUPPORTED_10baseT_Full)
2844 fd = DUPLEX_FULL;
2845
2846 /* Force link parameters */
2847 dev->phy.def->ops->setup_forced(&dev->phy, speed, fd);
2848 }
2849 return 0;
2850 }
2851
emac_init_config(struct emac_instance * dev)2852 static int emac_init_config(struct emac_instance *dev)
2853 {
2854 struct device_node *np = dev->ofdev->dev.of_node;
2855 int err;
2856
2857 /* Read config from device-tree */
2858 if (emac_read_uint_prop(np, "mal-device", &dev->mal_ph, 1))
2859 return -ENXIO;
2860 if (emac_read_uint_prop(np, "mal-tx-channel", &dev->mal_tx_chan, 1))
2861 return -ENXIO;
2862 if (emac_read_uint_prop(np, "mal-rx-channel", &dev->mal_rx_chan, 1))
2863 return -ENXIO;
2864 if (emac_read_uint_prop(np, "cell-index", &dev->cell_index, 1))
2865 return -ENXIO;
2866 if (emac_read_uint_prop(np, "max-frame-size", &dev->max_mtu, 0))
2867 dev->max_mtu = ETH_DATA_LEN;
2868 if (emac_read_uint_prop(np, "rx-fifo-size", &dev->rx_fifo_size, 0))
2869 dev->rx_fifo_size = 2048;
2870 if (emac_read_uint_prop(np, "tx-fifo-size", &dev->tx_fifo_size, 0))
2871 dev->tx_fifo_size = 2048;
2872 if (emac_read_uint_prop(np, "rx-fifo-size-gige", &dev->rx_fifo_size_gige, 0))
2873 dev->rx_fifo_size_gige = dev->rx_fifo_size;
2874 if (emac_read_uint_prop(np, "tx-fifo-size-gige", &dev->tx_fifo_size_gige, 0))
2875 dev->tx_fifo_size_gige = dev->tx_fifo_size;
2876 if (emac_read_uint_prop(np, "phy-address", &dev->phy_address, 0))
2877 dev->phy_address = 0xffffffff;
2878 if (emac_read_uint_prop(np, "phy-map", &dev->phy_map, 0))
2879 dev->phy_map = 0xffffffff;
2880 if (emac_read_uint_prop(np, "gpcs-address", &dev->gpcs_address, 0))
2881 dev->gpcs_address = 0xffffffff;
2882 if (emac_read_uint_prop(np->parent, "clock-frequency", &dev->opb_bus_freq, 1))
2883 return -ENXIO;
2884 if (emac_read_uint_prop(np, "tah-device", &dev->tah_ph, 0))
2885 dev->tah_ph = 0;
2886 if (emac_read_uint_prop(np, "tah-channel", &dev->tah_port, 0))
2887 dev->tah_port = 0;
2888 if (emac_read_uint_prop(np, "mdio-device", &dev->mdio_ph, 0))
2889 dev->mdio_ph = 0;
2890 if (emac_read_uint_prop(np, "zmii-device", &dev->zmii_ph, 0))
2891 dev->zmii_ph = 0;
2892 if (emac_read_uint_prop(np, "zmii-channel", &dev->zmii_port, 0))
2893 dev->zmii_port = 0xffffffff;
2894 if (emac_read_uint_prop(np, "rgmii-device", &dev->rgmii_ph, 0))
2895 dev->rgmii_ph = 0;
2896 if (emac_read_uint_prop(np, "rgmii-channel", &dev->rgmii_port, 0))
2897 dev->rgmii_port = 0xffffffff;
2898 if (emac_read_uint_prop(np, "fifo-entry-size", &dev->fifo_entry_size, 0))
2899 dev->fifo_entry_size = 16;
2900 if (emac_read_uint_prop(np, "mal-burst-size", &dev->mal_burst_size, 0))
2901 dev->mal_burst_size = 256;
2902
2903 /* PHY mode needs some decoding */
2904 err = of_get_phy_mode(np, &dev->phy_mode);
2905 if (err)
2906 dev->phy_mode = PHY_INTERFACE_MODE_NA;
2907
2908 /* Check EMAC version */
2909 if (of_device_is_compatible(np, "ibm,emac4sync")) {
2910 dev->features |= (EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC);
2911 if (of_device_is_compatible(np, "ibm,emac-460ex") ||
2912 of_device_is_compatible(np, "ibm,emac-460gt"))
2913 dev->features |= EMAC_FTR_460EX_PHY_CLK_FIX;
2914 if (of_device_is_compatible(np, "ibm,emac-405ex") ||
2915 of_device_is_compatible(np, "ibm,emac-405exr"))
2916 dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
2917 if (of_device_is_compatible(np, "ibm,emac-apm821xx")) {
2918 dev->features |= (EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE |
2919 EMAC_FTR_APM821XX_NO_HALF_DUPLEX |
2920 EMAC_FTR_460EX_PHY_CLK_FIX);
2921 }
2922 } else if (of_device_is_compatible(np, "ibm,emac4")) {
2923 dev->features |= EMAC_FTR_EMAC4;
2924 if (of_device_is_compatible(np, "ibm,emac-440gx"))
2925 dev->features |= EMAC_FTR_440GX_PHY_CLK_FIX;
2926 } else {
2927 if (of_device_is_compatible(np, "ibm,emac-440ep") ||
2928 of_device_is_compatible(np, "ibm,emac-440gr"))
2929 dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
2930 if (of_device_is_compatible(np, "ibm,emac-405ez")) {
2931 #ifdef CONFIG_IBM_EMAC_NO_FLOW_CTRL
2932 dev->features |= EMAC_FTR_NO_FLOW_CONTROL_40x;
2933 #else
2934 printk(KERN_ERR "%pOF: Flow control not disabled!\n",
2935 np);
2936 return -ENXIO;
2937 #endif
2938 }
2939
2940 }
2941
2942 /* Fixup some feature bits based on the device tree */
2943 if (of_property_read_bool(np, "has-inverted-stacr-oc"))
2944 dev->features |= EMAC_FTR_STACR_OC_INVERT;
2945 if (of_property_read_bool(np, "has-new-stacr-staopc"))
2946 dev->features |= EMAC_FTR_HAS_NEW_STACR;
2947
2948 /* CAB lacks the appropriate properties */
2949 if (of_device_is_compatible(np, "ibm,emac-axon"))
2950 dev->features |= EMAC_FTR_HAS_NEW_STACR |
2951 EMAC_FTR_STACR_OC_INVERT;
2952
2953 /* Enable TAH/ZMII/RGMII features as found */
2954 if (dev->tah_ph != 0) {
2955 #ifdef CONFIG_IBM_EMAC_TAH
2956 dev->features |= EMAC_FTR_HAS_TAH;
2957 #else
2958 printk(KERN_ERR "%pOF: TAH support not enabled !\n", np);
2959 return -ENXIO;
2960 #endif
2961 }
2962
2963 if (dev->zmii_ph != 0) {
2964 #ifdef CONFIG_IBM_EMAC_ZMII
2965 dev->features |= EMAC_FTR_HAS_ZMII;
2966 #else
2967 printk(KERN_ERR "%pOF: ZMII support not enabled !\n", np);
2968 return -ENXIO;
2969 #endif
2970 }
2971
2972 if (dev->rgmii_ph != 0) {
2973 #ifdef CONFIG_IBM_EMAC_RGMII
2974 dev->features |= EMAC_FTR_HAS_RGMII;
2975 #else
2976 printk(KERN_ERR "%pOF: RGMII support not enabled !\n", np);
2977 return -ENXIO;
2978 #endif
2979 }
2980
2981 /* Read MAC-address */
2982 err = of_get_ethdev_address(np, dev->ndev);
2983 if (err)
2984 return dev_err_probe(&dev->ofdev->dev, err,
2985 "Can't get valid [local-]mac-address from OF !\n");
2986
2987 /* IAHT and GAHT filter parameterization */
2988 if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {
2989 dev->xaht_slots_shift = EMAC4SYNC_XAHT_SLOTS_SHIFT;
2990 dev->xaht_width_shift = EMAC4SYNC_XAHT_WIDTH_SHIFT;
2991 } else {
2992 dev->xaht_slots_shift = EMAC4_XAHT_SLOTS_SHIFT;
2993 dev->xaht_width_shift = EMAC4_XAHT_WIDTH_SHIFT;
2994 }
2995
2996 /* This should never happen */
2997 if (WARN_ON(EMAC_XAHT_REGS(dev) > EMAC_XAHT_MAX_REGS))
2998 return -ENXIO;
2999
3000 DBG(dev, "features : 0x%08x / 0x%08x\n", dev->features, EMAC_FTRS_POSSIBLE);
3001 DBG(dev, "tx_fifo_size : %d (%d gige)\n", dev->tx_fifo_size, dev->tx_fifo_size_gige);
3002 DBG(dev, "rx_fifo_size : %d (%d gige)\n", dev->rx_fifo_size, dev->rx_fifo_size_gige);
3003 DBG(dev, "max_mtu : %d\n", dev->max_mtu);
3004 DBG(dev, "OPB freq : %d\n", dev->opb_bus_freq);
3005
3006 return 0;
3007 }
3008
3009 static const struct net_device_ops emac_netdev_ops = {
3010 .ndo_open = emac_open,
3011 .ndo_stop = emac_close,
3012 .ndo_get_stats = emac_stats,
3013 .ndo_set_rx_mode = emac_set_multicast_list,
3014 .ndo_eth_ioctl = emac_ioctl,
3015 .ndo_tx_timeout = emac_tx_timeout,
3016 .ndo_validate_addr = eth_validate_addr,
3017 .ndo_set_mac_address = emac_set_mac_address,
3018 .ndo_start_xmit = emac_start_xmit,
3019 };
3020
3021 static const struct net_device_ops emac_gige_netdev_ops = {
3022 .ndo_open = emac_open,
3023 .ndo_stop = emac_close,
3024 .ndo_get_stats = emac_stats,
3025 .ndo_set_rx_mode = emac_set_multicast_list,
3026 .ndo_eth_ioctl = emac_ioctl,
3027 .ndo_tx_timeout = emac_tx_timeout,
3028 .ndo_validate_addr = eth_validate_addr,
3029 .ndo_set_mac_address = emac_set_mac_address,
3030 .ndo_start_xmit = emac_start_xmit_sg,
3031 .ndo_change_mtu = emac_change_mtu,
3032 };
3033
emac_probe(struct platform_device * ofdev)3034 static int emac_probe(struct platform_device *ofdev)
3035 {
3036 struct net_device *ndev;
3037 struct emac_instance *dev;
3038 struct device_node *np = ofdev->dev.of_node;
3039 struct device_node **blist = NULL;
3040 int err, i;
3041
3042 /* Skip unused/unwired EMACS. We leave the check for an unused
3043 * property here for now, but new flat device trees should set a
3044 * status property to "disabled" instead.
3045 */
3046 if (of_property_read_bool(np, "unused") || !of_device_is_available(np))
3047 return -ENODEV;
3048
3049 /* Find ourselves in the bootlist if we are there */
3050 for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
3051 if (emac_boot_list[i] == np)
3052 blist = &emac_boot_list[i];
3053
3054 /* Allocate our net_device structure */
3055 err = -ENOMEM;
3056 ndev = alloc_etherdev(sizeof(struct emac_instance));
3057 if (!ndev)
3058 goto err_gone;
3059
3060 dev = netdev_priv(ndev);
3061 dev->ndev = ndev;
3062 dev->ofdev = ofdev;
3063 dev->blist = blist;
3064 SET_NETDEV_DEV(ndev, &ofdev->dev);
3065
3066 /* Initialize some embedded data structures */
3067 mutex_init(&dev->mdio_lock);
3068 mutex_init(&dev->link_lock);
3069 spin_lock_init(&dev->lock);
3070 INIT_WORK(&dev->reset_work, emac_reset_work);
3071
3072 /* Init various config data based on device-tree */
3073 err = emac_init_config(dev);
3074 if (err)
3075 goto err_free;
3076
3077 /* Get interrupts. EMAC irq is mandatory, WOL irq is optional */
3078 dev->emac_irq = irq_of_parse_and_map(np, 0);
3079 dev->wol_irq = irq_of_parse_and_map(np, 1);
3080 if (!dev->emac_irq) {
3081 printk(KERN_ERR "%pOF: Can't map main interrupt\n", np);
3082 err = -ENODEV;
3083 goto err_free;
3084 }
3085 ndev->irq = dev->emac_irq;
3086
3087 /* Map EMAC regs */
3088 // TODO : platform_get_resource() and devm_ioremap_resource()
3089 dev->emacp = of_iomap(np, 0);
3090 if (dev->emacp == NULL) {
3091 printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
3092 err = -ENOMEM;
3093 goto err_irq_unmap;
3094 }
3095
3096 /* Wait for dependent devices */
3097 err = emac_wait_deps(dev);
3098 if (err) {
3099 printk(KERN_ERR
3100 "%pOF: Timeout waiting for dependent devices\n", np);
3101 /* display more info about what's missing ? */
3102 goto err_reg_unmap;
3103 }
3104 dev->mal = platform_get_drvdata(dev->mal_dev);
3105 if (dev->mdio_dev != NULL)
3106 dev->mdio_instance = platform_get_drvdata(dev->mdio_dev);
3107
3108 /* Register with MAL */
3109 dev->commac.ops = &emac_commac_ops;
3110 dev->commac.dev = dev;
3111 dev->commac.tx_chan_mask = MAL_CHAN_MASK(dev->mal_tx_chan);
3112 dev->commac.rx_chan_mask = MAL_CHAN_MASK(dev->mal_rx_chan);
3113 err = mal_register_commac(dev->mal, &dev->commac);
3114 if (err) {
3115 printk(KERN_ERR "%pOF: failed to register with mal %pOF!\n",
3116 np, dev->mal_dev->dev.of_node);
3117 goto err_rel_deps;
3118 }
3119 dev->rx_skb_size = emac_rx_skb_size(ndev->mtu);
3120 dev->rx_sync_size = emac_rx_sync_size(ndev->mtu);
3121
3122 /* Get pointers to BD rings */
3123 dev->tx_desc =
3124 dev->mal->bd_virt + mal_tx_bd_offset(dev->mal, dev->mal_tx_chan);
3125 dev->rx_desc =
3126 dev->mal->bd_virt + mal_rx_bd_offset(dev->mal, dev->mal_rx_chan);
3127
3128 DBG(dev, "tx_desc %p" NL, dev->tx_desc);
3129 DBG(dev, "rx_desc %p" NL, dev->rx_desc);
3130
3131 /* Clean rings */
3132 memset(dev->tx_desc, 0, NUM_TX_BUFF * sizeof(struct mal_descriptor));
3133 memset(dev->rx_desc, 0, NUM_RX_BUFF * sizeof(struct mal_descriptor));
3134 memset(dev->tx_skb, 0, NUM_TX_BUFF * sizeof(struct sk_buff *));
3135 memset(dev->rx_skb, 0, NUM_RX_BUFF * sizeof(struct sk_buff *));
3136
3137 /* Attach to ZMII, if needed */
3138 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII) &&
3139 (err = zmii_attach(dev->zmii_dev, dev->zmii_port, &dev->phy_mode)) != 0)
3140 goto err_unreg_commac;
3141
3142 /* Attach to RGMII, if needed */
3143 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII) &&
3144 (err = rgmii_attach(dev->rgmii_dev, dev->rgmii_port, dev->phy_mode)) != 0)
3145 goto err_detach_zmii;
3146
3147 /* Attach to TAH, if needed */
3148 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH) &&
3149 (err = tah_attach(dev->tah_dev, dev->tah_port)) != 0)
3150 goto err_detach_rgmii;
3151
3152 /* Set some link defaults before we can find out real parameters */
3153 dev->phy.speed = SPEED_100;
3154 dev->phy.duplex = DUPLEX_FULL;
3155 dev->phy.autoneg = AUTONEG_DISABLE;
3156 dev->phy.pause = dev->phy.asym_pause = 0;
3157 dev->stop_timeout = STOP_TIMEOUT_100;
3158 INIT_DELAYED_WORK(&dev->link_work, emac_link_timer);
3159
3160 /* Some SoCs like APM821xx does not support Half Duplex mode. */
3161 if (emac_has_feature(dev, EMAC_FTR_APM821XX_NO_HALF_DUPLEX)) {
3162 dev->phy_feat_exc = (SUPPORTED_1000baseT_Half |
3163 SUPPORTED_100baseT_Half |
3164 SUPPORTED_10baseT_Half);
3165 }
3166
3167 /* Find PHY if any */
3168 err = emac_init_phy(dev);
3169 if (err != 0)
3170 goto err_detach_tah;
3171
3172 if (dev->tah_dev) {
3173 ndev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG;
3174 ndev->features |= ndev->hw_features | NETIF_F_RXCSUM;
3175 }
3176 ndev->watchdog_timeo = 5 * HZ;
3177 if (emac_phy_supports_gige(dev->phy_mode)) {
3178 ndev->netdev_ops = &emac_gige_netdev_ops;
3179 dev->commac.ops = &emac_commac_sg_ops;
3180 } else
3181 ndev->netdev_ops = &emac_netdev_ops;
3182 ndev->ethtool_ops = &emac_ethtool_ops;
3183
3184 /* MTU range: 46 - 1500 or whatever is in OF */
3185 ndev->min_mtu = EMAC_MIN_MTU;
3186 ndev->max_mtu = dev->max_mtu;
3187
3188 netif_carrier_off(ndev);
3189
3190 err = register_netdev(ndev);
3191 if (err) {
3192 printk(KERN_ERR "%pOF: failed to register net device (%d)!\n",
3193 np, err);
3194 goto err_detach_tah;
3195 }
3196
3197 /* Set our drvdata last as we don't want them visible until we are
3198 * fully initialized
3199 */
3200 wmb();
3201 platform_set_drvdata(ofdev, dev);
3202
3203 /* There's a new kid in town ! Let's tell everybody */
3204 wake_up_all(&emac_probe_wait);
3205
3206
3207 printk(KERN_INFO "%s: EMAC-%d %pOF, MAC %pM\n",
3208 ndev->name, dev->cell_index, np, ndev->dev_addr);
3209
3210 if (dev->phy_mode == PHY_INTERFACE_MODE_SGMII)
3211 printk(KERN_NOTICE "%s: in SGMII mode\n", ndev->name);
3212
3213 if (dev->phy.address >= 0)
3214 printk("%s: found %s PHY (0x%02x)\n", ndev->name,
3215 dev->phy.def->name, dev->phy.address);
3216
3217 /* Life is good */
3218 return 0;
3219
3220 /* I have a bad feeling about this ... */
3221
3222 err_detach_tah:
3223 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
3224 tah_detach(dev->tah_dev, dev->tah_port);
3225 err_detach_rgmii:
3226 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
3227 rgmii_detach(dev->rgmii_dev, dev->rgmii_port);
3228 err_detach_zmii:
3229 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
3230 zmii_detach(dev->zmii_dev, dev->zmii_port);
3231 err_unreg_commac:
3232 mal_unregister_commac(dev->mal, &dev->commac);
3233 err_rel_deps:
3234 emac_put_deps(dev);
3235 err_reg_unmap:
3236 iounmap(dev->emacp);
3237 err_irq_unmap:
3238 if (dev->wol_irq)
3239 irq_dispose_mapping(dev->wol_irq);
3240 if (dev->emac_irq)
3241 irq_dispose_mapping(dev->emac_irq);
3242 err_free:
3243 free_netdev(ndev);
3244 err_gone:
3245 /* if we were on the bootlist, remove us as we won't show up and
3246 * wake up all waiters to notify them in case they were waiting
3247 * on us
3248 */
3249 if (blist) {
3250 *blist = NULL;
3251 wake_up_all(&emac_probe_wait);
3252 }
3253 return err;
3254 }
3255
emac_remove(struct platform_device * ofdev)3256 static int emac_remove(struct platform_device *ofdev)
3257 {
3258 struct emac_instance *dev = platform_get_drvdata(ofdev);
3259
3260 DBG(dev, "remove" NL);
3261
3262 unregister_netdev(dev->ndev);
3263
3264 cancel_work_sync(&dev->reset_work);
3265
3266 if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
3267 tah_detach(dev->tah_dev, dev->tah_port);
3268 if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
3269 rgmii_detach(dev->rgmii_dev, dev->rgmii_port);
3270 if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
3271 zmii_detach(dev->zmii_dev, dev->zmii_port);
3272
3273 if (dev->phy_dev)
3274 phy_disconnect(dev->phy_dev);
3275
3276 if (dev->mii_bus)
3277 mdiobus_unregister(dev->mii_bus);
3278
3279 busy_phy_map &= ~(1 << dev->phy.address);
3280 DBG(dev, "busy_phy_map now %#x" NL, busy_phy_map);
3281
3282 mal_unregister_commac(dev->mal, &dev->commac);
3283 emac_put_deps(dev);
3284
3285 iounmap(dev->emacp);
3286
3287 if (dev->wol_irq)
3288 irq_dispose_mapping(dev->wol_irq);
3289 if (dev->emac_irq)
3290 irq_dispose_mapping(dev->emac_irq);
3291
3292 free_netdev(dev->ndev);
3293
3294 return 0;
3295 }
3296
3297 /* XXX Features in here should be replaced by properties... */
3298 static const struct of_device_id emac_match[] =
3299 {
3300 {
3301 .type = "network",
3302 .compatible = "ibm,emac",
3303 },
3304 {
3305 .type = "network",
3306 .compatible = "ibm,emac4",
3307 },
3308 {
3309 .type = "network",
3310 .compatible = "ibm,emac4sync",
3311 },
3312 {},
3313 };
3314 MODULE_DEVICE_TABLE(of, emac_match);
3315
3316 static struct platform_driver emac_driver = {
3317 .driver = {
3318 .name = "emac",
3319 .of_match_table = emac_match,
3320 },
3321 .probe = emac_probe,
3322 .remove = emac_remove,
3323 };
3324
emac_make_bootlist(void)3325 static void __init emac_make_bootlist(void)
3326 {
3327 struct device_node *np = NULL;
3328 int j, max, i = 0;
3329 int cell_indices[EMAC_BOOT_LIST_SIZE];
3330
3331 /* Collect EMACs */
3332 while((np = of_find_all_nodes(np)) != NULL) {
3333 const u32 *idx;
3334
3335 if (of_match_node(emac_match, np) == NULL)
3336 continue;
3337 if (of_property_read_bool(np, "unused"))
3338 continue;
3339 idx = of_get_property(np, "cell-index", NULL);
3340 if (idx == NULL)
3341 continue;
3342 cell_indices[i] = *idx;
3343 emac_boot_list[i++] = of_node_get(np);
3344 if (i >= EMAC_BOOT_LIST_SIZE) {
3345 of_node_put(np);
3346 break;
3347 }
3348 }
3349 max = i;
3350
3351 /* Bubble sort them (doh, what a creative algorithm :-) */
3352 for (i = 0; max > 1 && (i < (max - 1)); i++)
3353 for (j = i; j < max; j++) {
3354 if (cell_indices[i] > cell_indices[j]) {
3355 swap(emac_boot_list[i], emac_boot_list[j]);
3356 swap(cell_indices[i], cell_indices[j]);
3357 }
3358 }
3359 }
3360
emac_init(void)3361 static int __init emac_init(void)
3362 {
3363 int rc;
3364
3365 printk(KERN_INFO DRV_DESC ", version " DRV_VERSION "\n");
3366
3367 /* Build EMAC boot list */
3368 emac_make_bootlist();
3369
3370 /* Init submodules */
3371 rc = mal_init();
3372 if (rc)
3373 goto err;
3374 rc = zmii_init();
3375 if (rc)
3376 goto err_mal;
3377 rc = rgmii_init();
3378 if (rc)
3379 goto err_zmii;
3380 rc = tah_init();
3381 if (rc)
3382 goto err_rgmii;
3383 rc = platform_driver_register(&emac_driver);
3384 if (rc)
3385 goto err_tah;
3386
3387 return 0;
3388
3389 err_tah:
3390 tah_exit();
3391 err_rgmii:
3392 rgmii_exit();
3393 err_zmii:
3394 zmii_exit();
3395 err_mal:
3396 mal_exit();
3397 err:
3398 return rc;
3399 }
3400
emac_exit(void)3401 static void __exit emac_exit(void)
3402 {
3403 int i;
3404
3405 platform_driver_unregister(&emac_driver);
3406
3407 tah_exit();
3408 rgmii_exit();
3409 zmii_exit();
3410 mal_exit();
3411
3412 /* Destroy EMAC boot list */
3413 for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
3414 of_node_put(emac_boot_list[i]);
3415 }
3416
3417 module_init(emac_init);
3418 module_exit(emac_exit);
3419