1 /*
2  * Copyright (c) 2005-2008 Chelsio, Inc. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 #include "common.h"
33 #include "regs.h"
34 
35 /*
36  * # of exact address filters.  The first one is used for the station address,
37  * the rest are available for multicast addresses.
38  */
39 #define EXACT_ADDR_FILTERS 8
40 
41 static inline int macidx(const struct cmac *mac)
42 {
43 	return mac->offset / (XGMAC0_1_BASE_ADDR - XGMAC0_0_BASE_ADDR);
44 }
45 
46 static void xaui_serdes_reset(struct cmac *mac)
47 {
48 	static const unsigned int clear[] = {
49 		F_PWRDN0 | F_PWRDN1, F_RESETPLL01, F_RESET0 | F_RESET1,
50 		F_PWRDN2 | F_PWRDN3, F_RESETPLL23, F_RESET2 | F_RESET3
51 	};
52 
53 	int i;
54 	struct adapter *adap = mac->adapter;
55 	u32 ctrl = A_XGM_SERDES_CTRL0 + mac->offset;
56 
57 	t3_write_reg(adap, ctrl, adap->params.vpd.xauicfg[macidx(mac)] |
58 		     F_RESET3 | F_RESET2 | F_RESET1 | F_RESET0 |
59 		     F_PWRDN3 | F_PWRDN2 | F_PWRDN1 | F_PWRDN0 |
60 		     F_RESETPLL23 | F_RESETPLL01);
61 	t3_read_reg(adap, ctrl);
62 	udelay(15);
63 
64 	for (i = 0; i < ARRAY_SIZE(clear); i++) {
65 		t3_set_reg_field(adap, ctrl, clear[i], 0);
66 		udelay(15);
67 	}
68 }
69 
70 void t3b_pcs_reset(struct cmac *mac)
71 {
72 	t3_set_reg_field(mac->adapter, A_XGM_RESET_CTRL + mac->offset,
73 			 F_PCS_RESET_, 0);
74 	udelay(20);
75 	t3_set_reg_field(mac->adapter, A_XGM_RESET_CTRL + mac->offset, 0,
76 			 F_PCS_RESET_);
77 }
78 
79 int t3_mac_reset(struct cmac *mac)
80 {
81 	static const struct addr_val_pair mac_reset_avp[] = {
82 		{A_XGM_TX_CTRL, 0},
83 		{A_XGM_RX_CTRL, 0},
84 		{A_XGM_RX_CFG, F_DISPAUSEFRAMES | F_EN1536BFRAMES |
85 		 F_RMFCS | F_ENJUMBO | F_ENHASHMCAST},
86 		{A_XGM_RX_HASH_LOW, 0},
87 		{A_XGM_RX_HASH_HIGH, 0},
88 		{A_XGM_RX_EXACT_MATCH_LOW_1, 0},
89 		{A_XGM_RX_EXACT_MATCH_LOW_2, 0},
90 		{A_XGM_RX_EXACT_MATCH_LOW_3, 0},
91 		{A_XGM_RX_EXACT_MATCH_LOW_4, 0},
92 		{A_XGM_RX_EXACT_MATCH_LOW_5, 0},
93 		{A_XGM_RX_EXACT_MATCH_LOW_6, 0},
94 		{A_XGM_RX_EXACT_MATCH_LOW_7, 0},
95 		{A_XGM_RX_EXACT_MATCH_LOW_8, 0},
96 		{A_XGM_STAT_CTRL, F_CLRSTATS}
97 	};
98 	u32 val;
99 	struct adapter *adap = mac->adapter;
100 	unsigned int oft = mac->offset;
101 
102 	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, F_MAC_RESET_);
103 	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);	/* flush */
104 
105 	t3_write_regs(adap, mac_reset_avp, ARRAY_SIZE(mac_reset_avp), oft);
106 	t3_set_reg_field(adap, A_XGM_RXFIFO_CFG + oft,
107 			 F_RXSTRFRWRD | F_DISERRFRAMES,
108 			 uses_xaui(adap) ? 0 : F_RXSTRFRWRD);
109 	t3_set_reg_field(adap, A_XGM_TXFIFO_CFG + oft, 0, F_UNDERUNFIX);
110 
111 	if (uses_xaui(adap)) {
112 		if (adap->params.rev == 0) {
113 			t3_set_reg_field(adap, A_XGM_SERDES_CTRL + oft, 0,
114 					 F_RXENABLE | F_TXENABLE);
115 			if (t3_wait_op_done(adap, A_XGM_SERDES_STATUS1 + oft,
116 					    F_CMULOCK, 1, 5, 2)) {
117 				CH_ERR(adap,
118 				       "MAC %d XAUI SERDES CMU lock failed\n",
119 				       macidx(mac));
120 				return -1;
121 			}
122 			t3_set_reg_field(adap, A_XGM_SERDES_CTRL + oft, 0,
123 					 F_SERDESRESET_);
124 		} else
125 			xaui_serdes_reset(mac);
126 	}
127 
128 	t3_set_reg_field(adap, A_XGM_RX_MAX_PKT_SIZE + oft,
129 			 V_RXMAXFRAMERSIZE(M_RXMAXFRAMERSIZE),
130 			 V_RXMAXFRAMERSIZE(MAX_FRAME_SIZE) | F_RXENFRAMER);
131 	val = F_MAC_RESET_ | F_XGMAC_STOP_EN;
132 
133 	if (is_10G(adap))
134 		val |= F_PCS_RESET_;
135 	else if (uses_xaui(adap))
136 		val |= F_PCS_RESET_ | F_XG2G_RESET_;
137 	else
138 		val |= F_RGMII_RESET_ | F_XG2G_RESET_;
139 	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, val);
140 	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);	/* flush */
141 	if ((val & F_PCS_RESET_) && adap->params.rev) {
142 		msleep(1);
143 		t3b_pcs_reset(mac);
144 	}
145 
146 	memset(&mac->stats, 0, sizeof(mac->stats));
147 	return 0;
148 }
149 
150 static int t3b2_mac_reset(struct cmac *mac)
151 {
152 	struct adapter *adap = mac->adapter;
153 	unsigned int oft = mac->offset, store;
154 	int idx = macidx(mac);
155 	u32 val;
156 
157 	if (!macidx(mac))
158 		t3_set_reg_field(adap, A_MPS_CFG, F_PORT0ACTIVE, 0);
159 	else
160 		t3_set_reg_field(adap, A_MPS_CFG, F_PORT1ACTIVE, 0);
161 
162 	/* Stop NIC traffic to reduce the number of TXTOGGLES */
163 	t3_set_reg_field(adap, A_MPS_CFG, F_ENFORCEPKT, 0);
164 	/* Ensure TX drains */
165 	t3_set_reg_field(adap, A_XGM_TX_CFG + oft, F_TXPAUSEEN, 0);
166 
167 	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, F_MAC_RESET_);
168 	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);    /* flush */
169 
170 	/* Store A_TP_TX_DROP_CFG_CH0 */
171 	t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CFG_CH0 + idx);
172 	store = t3_read_reg(adap, A_TP_TX_DROP_CFG_CH0 + idx);
173 
174 	msleep(10);
175 
176 	/* Change DROP_CFG to 0xc0000011 */
177 	t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CFG_CH0 + idx);
178 	t3_write_reg(adap, A_TP_PIO_DATA, 0xc0000011);
179 
180 	/* Check for xgm Rx fifo empty */
181 	/* Increased loop count to 1000 from 5 cover 1G and 100Mbps case */
182 	if (t3_wait_op_done(adap, A_XGM_RX_MAX_PKT_SIZE_ERR_CNT + oft,
183 			    0x80000000, 1, 1000, 2)) {
184 		CH_ERR(adap, "MAC %d Rx fifo drain failed\n",
185 		       macidx(mac));
186 		return -1;
187 	}
188 
189 	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, 0);
190 	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);    /* flush */
191 
192 	val = F_MAC_RESET_;
193 	if (is_10G(adap))
194 		val |= F_PCS_RESET_;
195 	else if (uses_xaui(adap))
196 		val |= F_PCS_RESET_ | F_XG2G_RESET_;
197 	else
198 		val |= F_RGMII_RESET_ | F_XG2G_RESET_;
199 	t3_write_reg(adap, A_XGM_RESET_CTRL + oft, val);
200 	t3_read_reg(adap, A_XGM_RESET_CTRL + oft);  /* flush */
201 	if ((val & F_PCS_RESET_) && adap->params.rev) {
202 		msleep(1);
203 		t3b_pcs_reset(mac);
204 	}
205 	t3_write_reg(adap, A_XGM_RX_CFG + oft,
206 		     F_DISPAUSEFRAMES | F_EN1536BFRAMES |
207 		     F_RMFCS | F_ENJUMBO | F_ENHASHMCAST);
208 
209 	/* Restore the DROP_CFG */
210 	t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CFG_CH0 + idx);
211 	t3_write_reg(adap, A_TP_PIO_DATA, store);
212 
213 	if (!idx)
214 		t3_set_reg_field(adap, A_MPS_CFG, 0, F_PORT0ACTIVE);
215 	else
216 		t3_set_reg_field(adap, A_MPS_CFG, 0, F_PORT1ACTIVE);
217 
218 	/* re-enable nic traffic */
219 	t3_set_reg_field(adap, A_MPS_CFG, F_ENFORCEPKT, 1);
220 
221 	/*  Set: re-enable NIC traffic */
222 	t3_set_reg_field(adap, A_MPS_CFG, F_ENFORCEPKT, 1);
223 
224 	return 0;
225 }
226 
227 /*
228  * Set the exact match register 'idx' to recognize the given Ethernet address.
229  */
230 static void set_addr_filter(struct cmac *mac, int idx, const u8 * addr)
231 {
232 	u32 addr_lo, addr_hi;
233 	unsigned int oft = mac->offset + idx * 8;
234 
235 	addr_lo = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
236 	addr_hi = (addr[5] << 8) | addr[4];
237 
238 	t3_write_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_LOW_1 + oft, addr_lo);
239 	t3_write_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_HIGH_1 + oft, addr_hi);
240 }
241 
242 /* Set one of the station's unicast MAC addresses. */
243 int t3_mac_set_address(struct cmac *mac, unsigned int idx, u8 addr[6])
244 {
245 	if (idx >= mac->nucast)
246 		return -EINVAL;
247 	set_addr_filter(mac, idx, addr);
248 	return 0;
249 }
250 
251 /*
252  * Specify the number of exact address filters that should be reserved for
253  * unicast addresses.  Caller should reload the unicast and multicast addresses
254  * after calling this.
255  */
256 int t3_mac_set_num_ucast(struct cmac *mac, int n)
257 {
258 	if (n > EXACT_ADDR_FILTERS)
259 		return -EINVAL;
260 	mac->nucast = n;
261 	return 0;
262 }
263 
264 void t3_mac_disable_exact_filters(struct cmac *mac)
265 {
266 	unsigned int i, reg = mac->offset + A_XGM_RX_EXACT_MATCH_LOW_1;
267 
268 	for (i = 0; i < EXACT_ADDR_FILTERS; i++, reg += 8) {
269 		u32 v = t3_read_reg(mac->adapter, reg);
270 		t3_write_reg(mac->adapter, reg, v);
271 	}
272 	t3_read_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_LOW_1);	/* flush */
273 }
274 
275 void t3_mac_enable_exact_filters(struct cmac *mac)
276 {
277 	unsigned int i, reg = mac->offset + A_XGM_RX_EXACT_MATCH_HIGH_1;
278 
279 	for (i = 0; i < EXACT_ADDR_FILTERS; i++, reg += 8) {
280 		u32 v = t3_read_reg(mac->adapter, reg);
281 		t3_write_reg(mac->adapter, reg, v);
282 	}
283 	t3_read_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_LOW_1);	/* flush */
284 }
285 
286 /* Calculate the RX hash filter index of an Ethernet address */
287 static int hash_hw_addr(const u8 * addr)
288 {
289 	int hash = 0, octet, bit, i = 0, c;
290 
291 	for (octet = 0; octet < 6; ++octet)
292 		for (c = addr[octet], bit = 0; bit < 8; c >>= 1, ++bit) {
293 			hash ^= (c & 1) << i;
294 			if (++i == 6)
295 				i = 0;
296 		}
297 	return hash;
298 }
299 
300 int t3_mac_set_rx_mode(struct cmac *mac, struct net_device *dev)
301 {
302 	u32 val, hash_lo, hash_hi;
303 	struct adapter *adap = mac->adapter;
304 	unsigned int oft = mac->offset;
305 
306 	val = t3_read_reg(adap, A_XGM_RX_CFG + oft) & ~F_COPYALLFRAMES;
307 	if (dev->flags & IFF_PROMISC)
308 		val |= F_COPYALLFRAMES;
309 	t3_write_reg(adap, A_XGM_RX_CFG + oft, val);
310 
311 	if (dev->flags & IFF_ALLMULTI)
312 		hash_lo = hash_hi = 0xffffffff;
313 	else {
314 		struct netdev_hw_addr *ha;
315 		int exact_addr_idx = mac->nucast;
316 
317 		hash_lo = hash_hi = 0;
318 		netdev_for_each_mc_addr(ha, dev)
319 			if (exact_addr_idx < EXACT_ADDR_FILTERS)
320 				set_addr_filter(mac, exact_addr_idx++,
321 						ha->addr);
322 			else {
323 				int hash = hash_hw_addr(ha->addr);
324 
325 				if (hash < 32)
326 					hash_lo |= (1 << hash);
327 				else
328 					hash_hi |= (1 << (hash - 32));
329 			}
330 	}
331 
332 	t3_write_reg(adap, A_XGM_RX_HASH_LOW + oft, hash_lo);
333 	t3_write_reg(adap, A_XGM_RX_HASH_HIGH + oft, hash_hi);
334 	return 0;
335 }
336 
337 static int rx_fifo_hwm(int mtu)
338 {
339 	int hwm;
340 
341 	hwm = max(MAC_RXFIFO_SIZE - 3 * mtu, (MAC_RXFIFO_SIZE * 38) / 100);
342 	return min(hwm, MAC_RXFIFO_SIZE - 8192);
343 }
344 
345 int t3_mac_set_mtu(struct cmac *mac, unsigned int mtu)
346 {
347 	int hwm, lwm, divisor;
348 	int ipg;
349 	unsigned int thres, v, reg;
350 	struct adapter *adap = mac->adapter;
351 
352 	/*
353 	 * MAX_FRAME_SIZE inludes header + FCS, mtu doesn't.  The HW max
354 	 * packet size register includes header, but not FCS.
355 	 */
356 	mtu += 14;
357 	if (mtu > 1536)
358 		mtu += 4;
359 
360 	if (mtu > MAX_FRAME_SIZE - 4)
361 		return -EINVAL;
362 	t3_write_reg(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset, mtu);
363 
364 	if (adap->params.rev >= T3_REV_B2 &&
365 	    (t3_read_reg(adap, A_XGM_RX_CTRL + mac->offset) & F_RXEN)) {
366 		t3_mac_disable_exact_filters(mac);
367 		v = t3_read_reg(adap, A_XGM_RX_CFG + mac->offset);
368 		t3_set_reg_field(adap, A_XGM_RX_CFG + mac->offset,
369 				 F_ENHASHMCAST | F_COPYALLFRAMES, F_DISBCAST);
370 
371 		reg = adap->params.rev == T3_REV_B2 ?
372 			A_XGM_RX_MAX_PKT_SIZE_ERR_CNT : A_XGM_RXFIFO_CFG;
373 
374 		/* drain RX FIFO */
375 		if (t3_wait_op_done(adap, reg + mac->offset,
376 				    F_RXFIFO_EMPTY, 1, 20, 5)) {
377 			t3_write_reg(adap, A_XGM_RX_CFG + mac->offset, v);
378 			t3_mac_enable_exact_filters(mac);
379 			return -EIO;
380 		}
381 		t3_set_reg_field(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset,
382 				 V_RXMAXPKTSIZE(M_RXMAXPKTSIZE),
383 				 V_RXMAXPKTSIZE(mtu));
384 		t3_write_reg(adap, A_XGM_RX_CFG + mac->offset, v);
385 		t3_mac_enable_exact_filters(mac);
386 	} else
387 		t3_set_reg_field(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset,
388 				 V_RXMAXPKTSIZE(M_RXMAXPKTSIZE),
389 				 V_RXMAXPKTSIZE(mtu));
390 
391 	/*
392 	 * Adjust the PAUSE frame watermarks.  We always set the LWM, and the
393 	 * HWM only if flow-control is enabled.
394 	 */
395 	hwm = rx_fifo_hwm(mtu);
396 	lwm = min(3 * (int)mtu, MAC_RXFIFO_SIZE / 4);
397 	v = t3_read_reg(adap, A_XGM_RXFIFO_CFG + mac->offset);
398 	v &= ~V_RXFIFOPAUSELWM(M_RXFIFOPAUSELWM);
399 	v |= V_RXFIFOPAUSELWM(lwm / 8);
400 	if (G_RXFIFOPAUSEHWM(v))
401 		v = (v & ~V_RXFIFOPAUSEHWM(M_RXFIFOPAUSEHWM)) |
402 		    V_RXFIFOPAUSEHWM(hwm / 8);
403 
404 	t3_write_reg(adap, A_XGM_RXFIFO_CFG + mac->offset, v);
405 
406 	/* Adjust the TX FIFO threshold based on the MTU */
407 	thres = (adap->params.vpd.cclk * 1000) / 15625;
408 	thres = (thres * mtu) / 1000;
409 	if (is_10G(adap))
410 		thres /= 10;
411 	thres = mtu > thres ? (mtu - thres + 7) / 8 : 0;
412 	thres = max(thres, 8U);	/* need at least 8 */
413 	ipg = (adap->params.rev == T3_REV_C) ? 0 : 1;
414 	t3_set_reg_field(adap, A_XGM_TXFIFO_CFG + mac->offset,
415 			 V_TXFIFOTHRESH(M_TXFIFOTHRESH) | V_TXIPG(M_TXIPG),
416 			 V_TXFIFOTHRESH(thres) | V_TXIPG(ipg));
417 
418 	if (adap->params.rev > 0) {
419 		divisor = (adap->params.rev == T3_REV_C) ? 64 : 8;
420 		t3_write_reg(adap, A_XGM_PAUSE_TIMER + mac->offset,
421 			     (hwm - lwm) * 4 / divisor);
422 	}
423 	t3_write_reg(adap, A_XGM_TX_PAUSE_QUANTA + mac->offset,
424 		     MAC_RXFIFO_SIZE * 4 * 8 / 512);
425 	return 0;
426 }
427 
428 int t3_mac_set_speed_duplex_fc(struct cmac *mac, int speed, int duplex, int fc)
429 {
430 	u32 val;
431 	struct adapter *adap = mac->adapter;
432 	unsigned int oft = mac->offset;
433 
434 	if (duplex >= 0 && duplex != DUPLEX_FULL)
435 		return -EINVAL;
436 	if (speed >= 0) {
437 		if (speed == SPEED_10)
438 			val = V_PORTSPEED(0);
439 		else if (speed == SPEED_100)
440 			val = V_PORTSPEED(1);
441 		else if (speed == SPEED_1000)
442 			val = V_PORTSPEED(2);
443 		else if (speed == SPEED_10000)
444 			val = V_PORTSPEED(3);
445 		else
446 			return -EINVAL;
447 
448 		t3_set_reg_field(adap, A_XGM_PORT_CFG + oft,
449 				 V_PORTSPEED(M_PORTSPEED), val);
450 	}
451 
452 	val = t3_read_reg(adap, A_XGM_RXFIFO_CFG + oft);
453 	val &= ~V_RXFIFOPAUSEHWM(M_RXFIFOPAUSEHWM);
454 	if (fc & PAUSE_TX) {
455 		u32 rx_max_pkt_size =
456 		    G_RXMAXPKTSIZE(t3_read_reg(adap,
457 					       A_XGM_RX_MAX_PKT_SIZE + oft));
458 		val |= V_RXFIFOPAUSEHWM(rx_fifo_hwm(rx_max_pkt_size) / 8);
459 	}
460 	t3_write_reg(adap, A_XGM_RXFIFO_CFG + oft, val);
461 
462 	t3_set_reg_field(adap, A_XGM_TX_CFG + oft, F_TXPAUSEEN,
463 			 (fc & PAUSE_RX) ? F_TXPAUSEEN : 0);
464 	return 0;
465 }
466 
467 int t3_mac_enable(struct cmac *mac, int which)
468 {
469 	int idx = macidx(mac);
470 	struct adapter *adap = mac->adapter;
471 	unsigned int oft = mac->offset;
472 	struct mac_stats *s = &mac->stats;
473 
474 	if (which & MAC_DIRECTION_TX) {
475 		t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CFG_CH0 + idx);
476 		t3_write_reg(adap, A_TP_PIO_DATA,
477 			     adap->params.rev == T3_REV_C ?
478 			     0xc4ffff01 : 0xc0ede401);
479 		t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_MODE);
480 		t3_set_reg_field(adap, A_TP_PIO_DATA, 1 << idx,
481 				 adap->params.rev == T3_REV_C ? 0 : 1 << idx);
482 
483 		t3_write_reg(adap, A_XGM_TX_CTRL + oft, F_TXEN);
484 
485 		t3_write_reg(adap, A_TP_PIO_ADDR, A_TP_TX_DROP_CNT_CH0 + idx);
486 		mac->tx_mcnt = s->tx_frames;
487 		mac->tx_tcnt = (G_TXDROPCNTCH0RCVD(t3_read_reg(adap,
488 							A_TP_PIO_DATA)));
489 		mac->tx_xcnt = (G_TXSPI4SOPCNT(t3_read_reg(adap,
490 						A_XGM_TX_SPI4_SOP_EOP_CNT +
491 						oft)));
492 		mac->rx_mcnt = s->rx_frames;
493 		mac->rx_pause = s->rx_pause;
494 		mac->rx_xcnt = (G_TXSPI4SOPCNT(t3_read_reg(adap,
495 						A_XGM_RX_SPI4_SOP_EOP_CNT +
496 						oft)));
497 		mac->rx_ocnt = s->rx_fifo_ovfl;
498 		mac->txen = F_TXEN;
499 		mac->toggle_cnt = 0;
500 	}
501 	if (which & MAC_DIRECTION_RX)
502 		t3_write_reg(adap, A_XGM_RX_CTRL + oft, F_RXEN);
503 	return 0;
504 }
505 
506 int t3_mac_disable(struct cmac *mac, int which)
507 {
508 	struct adapter *adap = mac->adapter;
509 
510 	if (which & MAC_DIRECTION_TX) {
511 		t3_write_reg(adap, A_XGM_TX_CTRL + mac->offset, 0);
512 		mac->txen = 0;
513 	}
514 	if (which & MAC_DIRECTION_RX) {
515 		int val = F_MAC_RESET_;
516 
517 		t3_set_reg_field(mac->adapter, A_XGM_RESET_CTRL + mac->offset,
518 				 F_PCS_RESET_, 0);
519 		msleep(100);
520 		t3_write_reg(adap, A_XGM_RX_CTRL + mac->offset, 0);
521 		if (is_10G(adap))
522 			val |= F_PCS_RESET_;
523 		else if (uses_xaui(adap))
524 			val |= F_PCS_RESET_ | F_XG2G_RESET_;
525 		else
526 			val |= F_RGMII_RESET_ | F_XG2G_RESET_;
527 		t3_write_reg(mac->adapter, A_XGM_RESET_CTRL + mac->offset, val);
528 	}
529 	return 0;
530 }
531 
532 int t3b2_mac_watchdog_task(struct cmac *mac)
533 {
534 	struct adapter *adap = mac->adapter;
535 	struct mac_stats *s = &mac->stats;
536 	unsigned int tx_tcnt, tx_xcnt;
537 	u64 tx_mcnt = s->tx_frames;
538 	int status;
539 
540 	status = 0;
541 	tx_xcnt = 1;		/* By default tx_xcnt is making progress */
542 	tx_tcnt = mac->tx_tcnt;	/* If tx_mcnt is progressing ignore tx_tcnt */
543 	if (tx_mcnt == mac->tx_mcnt && mac->rx_pause == s->rx_pause) {
544 		tx_xcnt = (G_TXSPI4SOPCNT(t3_read_reg(adap,
545 						A_XGM_TX_SPI4_SOP_EOP_CNT +
546 					       	mac->offset)));
547 		if (tx_xcnt == 0) {
548 			t3_write_reg(adap, A_TP_PIO_ADDR,
549 				     A_TP_TX_DROP_CNT_CH0 + macidx(mac));
550 			tx_tcnt = (G_TXDROPCNTCH0RCVD(t3_read_reg(adap,
551 						      A_TP_PIO_DATA)));
552 		} else {
553 			goto out;
554 		}
555 	} else {
556 		mac->toggle_cnt = 0;
557 		goto out;
558 	}
559 
560 	if ((tx_tcnt != mac->tx_tcnt) && (mac->tx_xcnt == 0)) {
561 		if (mac->toggle_cnt > 4) {
562 			status = 2;
563 			goto out;
564 		} else {
565 			status = 1;
566 			goto out;
567 		}
568 	} else {
569 		mac->toggle_cnt = 0;
570 		goto out;
571 	}
572 
573 out:
574 	mac->tx_tcnt = tx_tcnt;
575 	mac->tx_xcnt = tx_xcnt;
576 	mac->tx_mcnt = s->tx_frames;
577 	mac->rx_pause = s->rx_pause;
578 	if (status == 1) {
579 		t3_write_reg(adap, A_XGM_TX_CTRL + mac->offset, 0);
580 		t3_read_reg(adap, A_XGM_TX_CTRL + mac->offset);  /* flush */
581 		t3_write_reg(adap, A_XGM_TX_CTRL + mac->offset, mac->txen);
582 		t3_read_reg(adap, A_XGM_TX_CTRL + mac->offset);  /* flush */
583 		mac->toggle_cnt++;
584 	} else if (status == 2) {
585 		t3b2_mac_reset(mac);
586 		mac->toggle_cnt = 0;
587 	}
588 	return status;
589 }
590 
591 /*
592  * This function is called periodically to accumulate the current values of the
593  * RMON counters into the port statistics.  Since the packet counters are only
594  * 32 bits they can overflow in ~286 secs at 10G, so the function should be
595  * called more frequently than that.  The byte counters are 45-bit wide, they
596  * would overflow in ~7.8 hours.
597  */
598 const struct mac_stats *t3_mac_update_stats(struct cmac *mac)
599 {
600 #define RMON_READ(mac, addr) t3_read_reg(mac->adapter, addr + mac->offset)
601 #define RMON_UPDATE(mac, name, reg) \
602 	(mac)->stats.name += (u64)RMON_READ(mac, A_XGM_STAT_##reg)
603 #define RMON_UPDATE64(mac, name, reg_lo, reg_hi) \
604 	(mac)->stats.name += RMON_READ(mac, A_XGM_STAT_##reg_lo) + \
605 			     ((u64)RMON_READ(mac, A_XGM_STAT_##reg_hi) << 32)
606 
607 	u32 v, lo;
608 
609 	RMON_UPDATE64(mac, rx_octets, RX_BYTES_LOW, RX_BYTES_HIGH);
610 	RMON_UPDATE64(mac, rx_frames, RX_FRAMES_LOW, RX_FRAMES_HIGH);
611 	RMON_UPDATE(mac, rx_mcast_frames, RX_MCAST_FRAMES);
612 	RMON_UPDATE(mac, rx_bcast_frames, RX_BCAST_FRAMES);
613 	RMON_UPDATE(mac, rx_fcs_errs, RX_CRC_ERR_FRAMES);
614 	RMON_UPDATE(mac, rx_pause, RX_PAUSE_FRAMES);
615 	RMON_UPDATE(mac, rx_jabber, RX_JABBER_FRAMES);
616 	RMON_UPDATE(mac, rx_short, RX_SHORT_FRAMES);
617 	RMON_UPDATE(mac, rx_symbol_errs, RX_SYM_CODE_ERR_FRAMES);
618 
619 	RMON_UPDATE(mac, rx_too_long, RX_OVERSIZE_FRAMES);
620 
621 	v = RMON_READ(mac, A_XGM_RX_MAX_PKT_SIZE_ERR_CNT);
622 	if (mac->adapter->params.rev == T3_REV_B2)
623 		v &= 0x7fffffff;
624 	mac->stats.rx_too_long += v;
625 
626 	RMON_UPDATE(mac, rx_frames_64, RX_64B_FRAMES);
627 	RMON_UPDATE(mac, rx_frames_65_127, RX_65_127B_FRAMES);
628 	RMON_UPDATE(mac, rx_frames_128_255, RX_128_255B_FRAMES);
629 	RMON_UPDATE(mac, rx_frames_256_511, RX_256_511B_FRAMES);
630 	RMON_UPDATE(mac, rx_frames_512_1023, RX_512_1023B_FRAMES);
631 	RMON_UPDATE(mac, rx_frames_1024_1518, RX_1024_1518B_FRAMES);
632 	RMON_UPDATE(mac, rx_frames_1519_max, RX_1519_MAXB_FRAMES);
633 
634 	RMON_UPDATE64(mac, tx_octets, TX_BYTE_LOW, TX_BYTE_HIGH);
635 	RMON_UPDATE64(mac, tx_frames, TX_FRAME_LOW, TX_FRAME_HIGH);
636 	RMON_UPDATE(mac, tx_mcast_frames, TX_MCAST);
637 	RMON_UPDATE(mac, tx_bcast_frames, TX_BCAST);
638 	RMON_UPDATE(mac, tx_pause, TX_PAUSE);
639 	/* This counts error frames in general (bad FCS, underrun, etc). */
640 	RMON_UPDATE(mac, tx_underrun, TX_ERR_FRAMES);
641 
642 	RMON_UPDATE(mac, tx_frames_64, TX_64B_FRAMES);
643 	RMON_UPDATE(mac, tx_frames_65_127, TX_65_127B_FRAMES);
644 	RMON_UPDATE(mac, tx_frames_128_255, TX_128_255B_FRAMES);
645 	RMON_UPDATE(mac, tx_frames_256_511, TX_256_511B_FRAMES);
646 	RMON_UPDATE(mac, tx_frames_512_1023, TX_512_1023B_FRAMES);
647 	RMON_UPDATE(mac, tx_frames_1024_1518, TX_1024_1518B_FRAMES);
648 	RMON_UPDATE(mac, tx_frames_1519_max, TX_1519_MAXB_FRAMES);
649 
650 	/* The next stat isn't clear-on-read. */
651 	t3_write_reg(mac->adapter, A_TP_MIB_INDEX, mac->offset ? 51 : 50);
652 	v = t3_read_reg(mac->adapter, A_TP_MIB_RDATA);
653 	lo = (u32) mac->stats.rx_cong_drops;
654 	mac->stats.rx_cong_drops += (u64) (v - lo);
655 
656 	return &mac->stats;
657 }
658