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Commit | Line | Data |
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1d3bb996 | 1 | /* |
3396c782 | 2 | * drivers/net/ethernet/ibm/emac/mal.c |
1d3bb996 DG |
3 | * |
4 | * Memory Access Layer (MAL) support | |
5 | * | |
17cf803a BH |
6 | * Copyright 2007 Benjamin Herrenschmidt, IBM Corp. |
7 | * <benh@kernel.crashing.org> | |
8 | * | |
9 | * Based on the arch/ppc version of the driver: | |
10 | * | |
1d3bb996 DG |
11 | * Copyright (c) 2004, 2005 Zultys Technologies. |
12 | * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> | |
13 | * | |
14 | * Based on original work by | |
15 | * Benjamin Herrenschmidt <benh@kernel.crashing.org>, | |
16 | * David Gibson <hermes@gibson.dropbear.id.au>, | |
17 | * | |
18 | * Armin Kuster <akuster@mvista.com> | |
19 | * Copyright 2002 MontaVista Softare Inc. | |
20 | * | |
21 | * This program is free software; you can redistribute it and/or modify it | |
22 | * under the terms of the GNU General Public License as published by the | |
23 | * Free Software Foundation; either version 2 of the License, or (at your | |
24 | * option) any later version. | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/delay.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
5af50730 | 30 | #include <linux/of_irq.h> |
1d3bb996 DG |
31 | |
32 | #include "core.h" | |
fbcc4bac | 33 | #include <asm/dcr-regs.h> |
1d3bb996 DG |
34 | |
35 | static int mal_count; | |
36 | ||
1dd06ae8 | 37 | int mal_register_commac(struct mal_instance *mal, struct mal_commac *commac) |
1d3bb996 DG |
38 | { |
39 | unsigned long flags; | |
40 | ||
41 | spin_lock_irqsave(&mal->lock, flags); | |
42 | ||
43 | MAL_DBG(mal, "reg(%08x, %08x)" NL, | |
44 | commac->tx_chan_mask, commac->rx_chan_mask); | |
45 | ||
46 | /* Don't let multiple commacs claim the same channel(s) */ | |
47 | if ((mal->tx_chan_mask & commac->tx_chan_mask) || | |
48 | (mal->rx_chan_mask & commac->rx_chan_mask)) { | |
49 | spin_unlock_irqrestore(&mal->lock, flags); | |
50 | printk(KERN_WARNING "mal%d: COMMAC channels conflict!\n", | |
51 | mal->index); | |
52 | return -EBUSY; | |
53 | } | |
54 | ||
b3e441c6 BH |
55 | if (list_empty(&mal->list)) |
56 | napi_enable(&mal->napi); | |
1d3bb996 DG |
57 | mal->tx_chan_mask |= commac->tx_chan_mask; |
58 | mal->rx_chan_mask |= commac->rx_chan_mask; | |
59 | list_add(&commac->list, &mal->list); | |
60 | ||
61 | spin_unlock_irqrestore(&mal->lock, flags); | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
51d4a1cc JB |
66 | void mal_unregister_commac(struct mal_instance *mal, |
67 | struct mal_commac *commac) | |
1d3bb996 DG |
68 | { |
69 | unsigned long flags; | |
70 | ||
71 | spin_lock_irqsave(&mal->lock, flags); | |
72 | ||
73 | MAL_DBG(mal, "unreg(%08x, %08x)" NL, | |
74 | commac->tx_chan_mask, commac->rx_chan_mask); | |
75 | ||
76 | mal->tx_chan_mask &= ~commac->tx_chan_mask; | |
77 | mal->rx_chan_mask &= ~commac->rx_chan_mask; | |
78 | list_del_init(&commac->list); | |
b3e441c6 BH |
79 | if (list_empty(&mal->list)) |
80 | napi_disable(&mal->napi); | |
1d3bb996 DG |
81 | |
82 | spin_unlock_irqrestore(&mal->lock, flags); | |
83 | } | |
84 | ||
85 | int mal_set_rcbs(struct mal_instance *mal, int channel, unsigned long size) | |
86 | { | |
87 | BUG_ON(channel < 0 || channel >= mal->num_rx_chans || | |
88 | size > MAL_MAX_RX_SIZE); | |
89 | ||
90 | MAL_DBG(mal, "set_rbcs(%d, %lu)" NL, channel, size); | |
91 | ||
92 | if (size & 0xf) { | |
93 | printk(KERN_WARNING | |
94 | "mal%d: incorrect RX size %lu for the channel %d\n", | |
95 | mal->index, size, channel); | |
96 | return -EINVAL; | |
97 | } | |
98 | ||
99 | set_mal_dcrn(mal, MAL_RCBS(channel), size >> 4); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | int mal_tx_bd_offset(struct mal_instance *mal, int channel) | |
104 | { | |
105 | BUG_ON(channel < 0 || channel >= mal->num_tx_chans); | |
106 | ||
107 | return channel * NUM_TX_BUFF; | |
108 | } | |
109 | ||
110 | int mal_rx_bd_offset(struct mal_instance *mal, int channel) | |
111 | { | |
112 | BUG_ON(channel < 0 || channel >= mal->num_rx_chans); | |
113 | return mal->num_tx_chans * NUM_TX_BUFF + channel * NUM_RX_BUFF; | |
114 | } | |
115 | ||
116 | void mal_enable_tx_channel(struct mal_instance *mal, int channel) | |
117 | { | |
118 | unsigned long flags; | |
119 | ||
120 | spin_lock_irqsave(&mal->lock, flags); | |
121 | ||
122 | MAL_DBG(mal, "enable_tx(%d)" NL, channel); | |
123 | ||
124 | set_mal_dcrn(mal, MAL_TXCASR, | |
125 | get_mal_dcrn(mal, MAL_TXCASR) | MAL_CHAN_MASK(channel)); | |
126 | ||
127 | spin_unlock_irqrestore(&mal->lock, flags); | |
128 | } | |
129 | ||
130 | void mal_disable_tx_channel(struct mal_instance *mal, int channel) | |
131 | { | |
132 | set_mal_dcrn(mal, MAL_TXCARR, MAL_CHAN_MASK(channel)); | |
133 | ||
134 | MAL_DBG(mal, "disable_tx(%d)" NL, channel); | |
135 | } | |
136 | ||
137 | void mal_enable_rx_channel(struct mal_instance *mal, int channel) | |
138 | { | |
139 | unsigned long flags; | |
140 | ||
afd1dee8 SR |
141 | /* |
142 | * On some 4xx PPC's (e.g. 460EX/GT), the rx channel is a multiple | |
143 | * of 8, but enabling in MAL_RXCASR needs the divided by 8 value | |
144 | * for the bitmask | |
145 | */ | |
146 | if (!(channel % 8)) | |
147 | channel >>= 3; | |
148 | ||
1d3bb996 DG |
149 | spin_lock_irqsave(&mal->lock, flags); |
150 | ||
151 | MAL_DBG(mal, "enable_rx(%d)" NL, channel); | |
152 | ||
153 | set_mal_dcrn(mal, MAL_RXCASR, | |
154 | get_mal_dcrn(mal, MAL_RXCASR) | MAL_CHAN_MASK(channel)); | |
155 | ||
156 | spin_unlock_irqrestore(&mal->lock, flags); | |
157 | } | |
158 | ||
159 | void mal_disable_rx_channel(struct mal_instance *mal, int channel) | |
160 | { | |
afd1dee8 SR |
161 | /* |
162 | * On some 4xx PPC's (e.g. 460EX/GT), the rx channel is a multiple | |
163 | * of 8, but enabling in MAL_RXCASR needs the divided by 8 value | |
164 | * for the bitmask | |
165 | */ | |
166 | if (!(channel % 8)) | |
167 | channel >>= 3; | |
168 | ||
1d3bb996 DG |
169 | set_mal_dcrn(mal, MAL_RXCARR, MAL_CHAN_MASK(channel)); |
170 | ||
171 | MAL_DBG(mal, "disable_rx(%d)" NL, channel); | |
172 | } | |
173 | ||
174 | void mal_poll_add(struct mal_instance *mal, struct mal_commac *commac) | |
175 | { | |
176 | unsigned long flags; | |
177 | ||
178 | spin_lock_irqsave(&mal->lock, flags); | |
179 | ||
180 | MAL_DBG(mal, "poll_add(%p)" NL, commac); | |
181 | ||
182 | /* starts disabled */ | |
183 | set_bit(MAL_COMMAC_POLL_DISABLED, &commac->flags); | |
184 | ||
185 | list_add_tail(&commac->poll_list, &mal->poll_list); | |
186 | ||
187 | spin_unlock_irqrestore(&mal->lock, flags); | |
188 | } | |
189 | ||
190 | void mal_poll_del(struct mal_instance *mal, struct mal_commac *commac) | |
191 | { | |
192 | unsigned long flags; | |
193 | ||
194 | spin_lock_irqsave(&mal->lock, flags); | |
195 | ||
196 | MAL_DBG(mal, "poll_del(%p)" NL, commac); | |
197 | ||
198 | list_del(&commac->poll_list); | |
199 | ||
200 | spin_unlock_irqrestore(&mal->lock, flags); | |
201 | } | |
202 | ||
203 | /* synchronized by mal_poll() */ | |
204 | static inline void mal_enable_eob_irq(struct mal_instance *mal) | |
205 | { | |
206 | MAL_DBG2(mal, "enable_irq" NL); | |
207 | ||
208 | // XXX might want to cache MAL_CFG as the DCR read can be slooooow | |
209 | set_mal_dcrn(mal, MAL_CFG, get_mal_dcrn(mal, MAL_CFG) | MAL_CFG_EOPIE); | |
210 | } | |
211 | ||
b3e441c6 | 212 | /* synchronized by NAPI state */ |
1d3bb996 DG |
213 | static inline void mal_disable_eob_irq(struct mal_instance *mal) |
214 | { | |
215 | // XXX might want to cache MAL_CFG as the DCR read can be slooooow | |
216 | set_mal_dcrn(mal, MAL_CFG, get_mal_dcrn(mal, MAL_CFG) & ~MAL_CFG_EOPIE); | |
217 | ||
218 | MAL_DBG2(mal, "disable_irq" NL); | |
219 | } | |
220 | ||
221 | static irqreturn_t mal_serr(int irq, void *dev_instance) | |
222 | { | |
223 | struct mal_instance *mal = dev_instance; | |
224 | ||
225 | u32 esr = get_mal_dcrn(mal, MAL_ESR); | |
226 | ||
227 | /* Clear the error status register */ | |
228 | set_mal_dcrn(mal, MAL_ESR, esr); | |
229 | ||
230 | MAL_DBG(mal, "SERR %08x" NL, esr); | |
231 | ||
232 | if (esr & MAL_ESR_EVB) { | |
233 | if (esr & MAL_ESR_DE) { | |
234 | /* We ignore Descriptor error, | |
235 | * TXDE or RXDE interrupt will be generated anyway. | |
236 | */ | |
237 | return IRQ_HANDLED; | |
238 | } | |
239 | ||
240 | if (esr & MAL_ESR_PEIN) { | |
241 | /* PLB error, it's probably buggy hardware or | |
242 | * incorrect physical address in BD (i.e. bug) | |
243 | */ | |
244 | if (net_ratelimit()) | |
245 | printk(KERN_ERR | |
246 | "mal%d: system error, " | |
247 | "PLB (ESR = 0x%08x)\n", | |
248 | mal->index, esr); | |
249 | return IRQ_HANDLED; | |
250 | } | |
251 | ||
252 | /* OPB error, it's probably buggy hardware or incorrect | |
253 | * EBC setup | |
254 | */ | |
255 | if (net_ratelimit()) | |
256 | printk(KERN_ERR | |
257 | "mal%d: system error, OPB (ESR = 0x%08x)\n", | |
258 | mal->index, esr); | |
259 | } | |
260 | return IRQ_HANDLED; | |
261 | } | |
262 | ||
263 | static inline void mal_schedule_poll(struct mal_instance *mal) | |
264 | { | |
59e90b2d | 265 | if (likely(napi_schedule_prep(&mal->napi))) { |
1d3bb996 | 266 | MAL_DBG2(mal, "schedule_poll" NL); |
32663b8b | 267 | spin_lock(&mal->lock); |
1d3bb996 | 268 | mal_disable_eob_irq(mal); |
32663b8b | 269 | spin_unlock(&mal->lock); |
59e90b2d | 270 | __napi_schedule(&mal->napi); |
1d3bb996 DG |
271 | } else |
272 | MAL_DBG2(mal, "already in poll" NL); | |
273 | } | |
274 | ||
275 | static irqreturn_t mal_txeob(int irq, void *dev_instance) | |
276 | { | |
277 | struct mal_instance *mal = dev_instance; | |
278 | ||
279 | u32 r = get_mal_dcrn(mal, MAL_TXEOBISR); | |
280 | ||
281 | MAL_DBG2(mal, "txeob %08x" NL, r); | |
282 | ||
283 | mal_schedule_poll(mal); | |
284 | set_mal_dcrn(mal, MAL_TXEOBISR, r); | |
285 | ||
1ff0fcfc | 286 | #ifdef CONFIG_PPC_DCR_NATIVE |
fbcc4bac JB |
287 | if (mal_has_feature(mal, MAL_FTR_CLEAR_ICINTSTAT)) |
288 | mtdcri(SDR0, DCRN_SDR_ICINTSTAT, | |
289 | (mfdcri(SDR0, DCRN_SDR_ICINTSTAT) | ICINTSTAT_ICTX)); | |
1ff0fcfc | 290 | #endif |
fbcc4bac | 291 | |
1d3bb996 DG |
292 | return IRQ_HANDLED; |
293 | } | |
294 | ||
295 | static irqreturn_t mal_rxeob(int irq, void *dev_instance) | |
296 | { | |
297 | struct mal_instance *mal = dev_instance; | |
298 | ||
299 | u32 r = get_mal_dcrn(mal, MAL_RXEOBISR); | |
300 | ||
301 | MAL_DBG2(mal, "rxeob %08x" NL, r); | |
302 | ||
303 | mal_schedule_poll(mal); | |
304 | set_mal_dcrn(mal, MAL_RXEOBISR, r); | |
305 | ||
1ff0fcfc | 306 | #ifdef CONFIG_PPC_DCR_NATIVE |
fbcc4bac JB |
307 | if (mal_has_feature(mal, MAL_FTR_CLEAR_ICINTSTAT)) |
308 | mtdcri(SDR0, DCRN_SDR_ICINTSTAT, | |
309 | (mfdcri(SDR0, DCRN_SDR_ICINTSTAT) | ICINTSTAT_ICRX)); | |
1ff0fcfc | 310 | #endif |
fbcc4bac | 311 | |
1d3bb996 DG |
312 | return IRQ_HANDLED; |
313 | } | |
314 | ||
315 | static irqreturn_t mal_txde(int irq, void *dev_instance) | |
316 | { | |
317 | struct mal_instance *mal = dev_instance; | |
318 | ||
319 | u32 deir = get_mal_dcrn(mal, MAL_TXDEIR); | |
320 | set_mal_dcrn(mal, MAL_TXDEIR, deir); | |
321 | ||
322 | MAL_DBG(mal, "txde %08x" NL, deir); | |
323 | ||
324 | if (net_ratelimit()) | |
325 | printk(KERN_ERR | |
326 | "mal%d: TX descriptor error (TXDEIR = 0x%08x)\n", | |
327 | mal->index, deir); | |
328 | ||
329 | return IRQ_HANDLED; | |
330 | } | |
331 | ||
332 | static irqreturn_t mal_rxde(int irq, void *dev_instance) | |
333 | { | |
334 | struct mal_instance *mal = dev_instance; | |
335 | struct list_head *l; | |
336 | ||
337 | u32 deir = get_mal_dcrn(mal, MAL_RXDEIR); | |
338 | ||
339 | MAL_DBG(mal, "rxde %08x" NL, deir); | |
340 | ||
341 | list_for_each(l, &mal->list) { | |
342 | struct mal_commac *mc = list_entry(l, struct mal_commac, list); | |
343 | if (deir & mc->rx_chan_mask) { | |
344 | set_bit(MAL_COMMAC_RX_STOPPED, &mc->flags); | |
345 | mc->ops->rxde(mc->dev); | |
346 | } | |
347 | } | |
348 | ||
349 | mal_schedule_poll(mal); | |
350 | set_mal_dcrn(mal, MAL_RXDEIR, deir); | |
351 | ||
352 | return IRQ_HANDLED; | |
353 | } | |
354 | ||
fbcc4bac JB |
355 | static irqreturn_t mal_int(int irq, void *dev_instance) |
356 | { | |
357 | struct mal_instance *mal = dev_instance; | |
358 | u32 esr = get_mal_dcrn(mal, MAL_ESR); | |
359 | ||
360 | if (esr & MAL_ESR_EVB) { | |
361 | /* descriptor error */ | |
362 | if (esr & MAL_ESR_DE) { | |
363 | if (esr & MAL_ESR_CIDT) | |
364 | return mal_rxde(irq, dev_instance); | |
365 | else | |
366 | return mal_txde(irq, dev_instance); | |
367 | } else { /* SERR */ | |
368 | return mal_serr(irq, dev_instance); | |
369 | } | |
370 | } | |
371 | return IRQ_HANDLED; | |
372 | } | |
373 | ||
1d3bb996 DG |
374 | void mal_poll_disable(struct mal_instance *mal, struct mal_commac *commac) |
375 | { | |
376 | /* Spinlock-type semantics: only one caller disable poll at a time */ | |
377 | while (test_and_set_bit(MAL_COMMAC_POLL_DISABLED, &commac->flags)) | |
378 | msleep(1); | |
379 | ||
b3e441c6 | 380 | /* Synchronize with the MAL NAPI poller */ |
e30d4227 | 381 | napi_synchronize(&mal->napi); |
1d3bb996 DG |
382 | } |
383 | ||
384 | void mal_poll_enable(struct mal_instance *mal, struct mal_commac *commac) | |
385 | { | |
386 | smp_wmb(); | |
387 | clear_bit(MAL_COMMAC_POLL_DISABLED, &commac->flags); | |
388 | ||
b3e441c6 BH |
389 | /* Feels better to trigger a poll here to catch up with events that |
390 | * may have happened on this channel while disabled. It will most | |
391 | * probably be delayed until the next interrupt but that's mostly a | |
392 | * non-issue in the context where this is called. | |
393 | */ | |
394 | napi_schedule(&mal->napi); | |
1d3bb996 DG |
395 | } |
396 | ||
59e90b2d | 397 | static int mal_poll(struct napi_struct *napi, int budget) |
1d3bb996 | 398 | { |
59e90b2d | 399 | struct mal_instance *mal = container_of(napi, struct mal_instance, napi); |
1d3bb996 | 400 | struct list_head *l; |
59e90b2d | 401 | int received = 0; |
1d3bb996 DG |
402 | unsigned long flags; |
403 | ||
b3e441c6 | 404 | MAL_DBG2(mal, "poll(%d)" NL, budget); |
f5595606 | 405 | |
1d3bb996 DG |
406 | /* Process TX skbs */ |
407 | list_for_each(l, &mal->poll_list) { | |
408 | struct mal_commac *mc = | |
409 | list_entry(l, struct mal_commac, poll_list); | |
410 | mc->ops->poll_tx(mc->dev); | |
411 | } | |
412 | ||
413 | /* Process RX skbs. | |
414 | * | |
415 | * We _might_ need something more smart here to enforce polling | |
416 | * fairness. | |
417 | */ | |
418 | list_for_each(l, &mal->poll_list) { | |
419 | struct mal_commac *mc = | |
420 | list_entry(l, struct mal_commac, poll_list); | |
421 | int n; | |
422 | if (unlikely(test_bit(MAL_COMMAC_POLL_DISABLED, &mc->flags))) | |
423 | continue; | |
3d1a6333 | 424 | n = mc->ops->poll_rx(mc->dev, budget - received); |
1d3bb996 DG |
425 | if (n) { |
426 | received += n; | |
3d1a6333 ED |
427 | if (received >= budget) |
428 | return budget; | |
1d3bb996 DG |
429 | } |
430 | } | |
431 | ||
3d1a6333 ED |
432 | if (napi_complete_done(napi, received)) { |
433 | /* We need to disable IRQs to protect from RXDE IRQ here */ | |
434 | spin_lock_irqsave(&mal->lock, flags); | |
435 | mal_enable_eob_irq(mal); | |
436 | spin_unlock_irqrestore(&mal->lock, flags); | |
437 | } | |
1d3bb996 | 438 | |
1d3bb996 DG |
439 | /* Check for "rotting" packet(s) */ |
440 | list_for_each(l, &mal->poll_list) { | |
441 | struct mal_commac *mc = | |
442 | list_entry(l, struct mal_commac, poll_list); | |
443 | if (unlikely(test_bit(MAL_COMMAC_POLL_DISABLED, &mc->flags))) | |
444 | continue; | |
445 | if (unlikely(mc->ops->peek_rx(mc->dev) || | |
446 | test_bit(MAL_COMMAC_RX_STOPPED, &mc->flags))) { | |
447 | MAL_DBG2(mal, "rotting packet" NL); | |
b4dfd326 | 448 | if (!napi_reschedule(napi)) |
1d3bb996 | 449 | goto more_work; |
b4dfd326 | 450 | |
32663b8b | 451 | spin_lock_irqsave(&mal->lock, flags); |
b4dfd326 | 452 | mal_disable_eob_irq(mal); |
32663b8b | 453 | spin_unlock_irqrestore(&mal->lock, flags); |
1d3bb996 DG |
454 | } |
455 | mc->ops->poll_tx(mc->dev); | |
456 | } | |
457 | ||
458 | more_work: | |
59e90b2d RD |
459 | MAL_DBG2(mal, "poll() %d <- %d" NL, budget, received); |
460 | return received; | |
1d3bb996 DG |
461 | } |
462 | ||
463 | static void mal_reset(struct mal_instance *mal) | |
464 | { | |
465 | int n = 10; | |
466 | ||
467 | MAL_DBG(mal, "reset" NL); | |
468 | ||
469 | set_mal_dcrn(mal, MAL_CFG, MAL_CFG_SR); | |
470 | ||
471 | /* Wait for reset to complete (1 system clock) */ | |
472 | while ((get_mal_dcrn(mal, MAL_CFG) & MAL_CFG_SR) && n) | |
473 | --n; | |
474 | ||
475 | if (unlikely(!n)) | |
476 | printk(KERN_ERR "mal%d: reset timeout\n", mal->index); | |
477 | } | |
478 | ||
479 | int mal_get_regs_len(struct mal_instance *mal) | |
480 | { | |
481 | return sizeof(struct emac_ethtool_regs_subhdr) + | |
482 | sizeof(struct mal_regs); | |
483 | } | |
484 | ||
485 | void *mal_dump_regs(struct mal_instance *mal, void *buf) | |
486 | { | |
487 | struct emac_ethtool_regs_subhdr *hdr = buf; | |
488 | struct mal_regs *regs = (struct mal_regs *)(hdr + 1); | |
489 | int i; | |
490 | ||
491 | hdr->version = mal->version; | |
492 | hdr->index = mal->index; | |
493 | ||
494 | regs->tx_count = mal->num_tx_chans; | |
495 | regs->rx_count = mal->num_rx_chans; | |
496 | ||
497 | regs->cfg = get_mal_dcrn(mal, MAL_CFG); | |
498 | regs->esr = get_mal_dcrn(mal, MAL_ESR); | |
499 | regs->ier = get_mal_dcrn(mal, MAL_IER); | |
500 | regs->tx_casr = get_mal_dcrn(mal, MAL_TXCASR); | |
501 | regs->tx_carr = get_mal_dcrn(mal, MAL_TXCARR); | |
502 | regs->tx_eobisr = get_mal_dcrn(mal, MAL_TXEOBISR); | |
503 | regs->tx_deir = get_mal_dcrn(mal, MAL_TXDEIR); | |
504 | regs->rx_casr = get_mal_dcrn(mal, MAL_RXCASR); | |
505 | regs->rx_carr = get_mal_dcrn(mal, MAL_RXCARR); | |
506 | regs->rx_eobisr = get_mal_dcrn(mal, MAL_RXEOBISR); | |
507 | regs->rx_deir = get_mal_dcrn(mal, MAL_RXDEIR); | |
508 | ||
509 | for (i = 0; i < regs->tx_count; ++i) | |
510 | regs->tx_ctpr[i] = get_mal_dcrn(mal, MAL_TXCTPR(i)); | |
511 | ||
512 | for (i = 0; i < regs->rx_count; ++i) { | |
513 | regs->rx_ctpr[i] = get_mal_dcrn(mal, MAL_RXCTPR(i)); | |
514 | regs->rcbs[i] = get_mal_dcrn(mal, MAL_RCBS(i)); | |
515 | } | |
516 | return regs + 1; | |
517 | } | |
518 | ||
fe17dc1e | 519 | static int mal_probe(struct platform_device *ofdev) |
1d3bb996 DG |
520 | { |
521 | struct mal_instance *mal; | |
522 | int err = 0, i, bd_size; | |
523 | int index = mal_count++; | |
79203695 | 524 | unsigned int dcr_base; |
1d3bb996 DG |
525 | const u32 *prop; |
526 | u32 cfg; | |
fbcc4bac JB |
527 | unsigned long irqflags; |
528 | irq_handler_t hdlr_serr, hdlr_txde, hdlr_rxde; | |
1d3bb996 DG |
529 | |
530 | mal = kzalloc(sizeof(struct mal_instance), GFP_KERNEL); | |
b2adaca9 | 531 | if (!mal) |
1d3bb996 | 532 | return -ENOMEM; |
b2adaca9 | 533 | |
1d3bb996 DG |
534 | mal->index = index; |
535 | mal->ofdev = ofdev; | |
61c7a080 | 536 | mal->version = of_device_is_compatible(ofdev->dev.of_node, "ibm,mcmal2") ? 2 : 1; |
1d3bb996 DG |
537 | |
538 | MAL_DBG(mal, "probe" NL); | |
539 | ||
61c7a080 | 540 | prop = of_get_property(ofdev->dev.of_node, "num-tx-chans", NULL); |
1d3bb996 DG |
541 | if (prop == NULL) { |
542 | printk(KERN_ERR | |
543 | "mal%d: can't find MAL num-tx-chans property!\n", | |
544 | index); | |
545 | err = -ENODEV; | |
546 | goto fail; | |
547 | } | |
548 | mal->num_tx_chans = prop[0]; | |
549 | ||
61c7a080 | 550 | prop = of_get_property(ofdev->dev.of_node, "num-rx-chans", NULL); |
1d3bb996 DG |
551 | if (prop == NULL) { |
552 | printk(KERN_ERR | |
553 | "mal%d: can't find MAL num-rx-chans property!\n", | |
554 | index); | |
555 | err = -ENODEV; | |
556 | goto fail; | |
557 | } | |
558 | mal->num_rx_chans = prop[0]; | |
559 | ||
61c7a080 | 560 | dcr_base = dcr_resource_start(ofdev->dev.of_node, 0); |
79203695 | 561 | if (dcr_base == 0) { |
1d3bb996 DG |
562 | printk(KERN_ERR |
563 | "mal%d: can't find DCR resource!\n", index); | |
564 | err = -ENODEV; | |
565 | goto fail; | |
566 | } | |
61c7a080 | 567 | mal->dcr_host = dcr_map(ofdev->dev.of_node, dcr_base, 0x100); |
1d3bb996 DG |
568 | if (!DCR_MAP_OK(mal->dcr_host)) { |
569 | printk(KERN_ERR | |
570 | "mal%d: failed to map DCRs !\n", index); | |
571 | err = -ENODEV; | |
572 | goto fail; | |
573 | } | |
574 | ||
61c7a080 | 575 | if (of_device_is_compatible(ofdev->dev.of_node, "ibm,mcmal-405ez")) { |
3b3bceef TB |
576 | #if defined(CONFIG_IBM_EMAC_MAL_CLR_ICINTSTAT) && \ |
577 | defined(CONFIG_IBM_EMAC_MAL_COMMON_ERR) | |
fbcc4bac JB |
578 | mal->features |= (MAL_FTR_CLEAR_ICINTSTAT | |
579 | MAL_FTR_COMMON_ERR_INT); | |
1ff0fcfc | 580 | #else |
f7ce9103 RH |
581 | printk(KERN_ERR "%pOF: Support for 405EZ not enabled!\n", |
582 | ofdev->dev.of_node); | |
1ff0fcfc JB |
583 | err = -ENODEV; |
584 | goto fail; | |
585 | #endif | |
586 | } | |
fbcc4bac | 587 | |
61c7a080 GL |
588 | mal->txeob_irq = irq_of_parse_and_map(ofdev->dev.of_node, 0); |
589 | mal->rxeob_irq = irq_of_parse_and_map(ofdev->dev.of_node, 1); | |
590 | mal->serr_irq = irq_of_parse_and_map(ofdev->dev.of_node, 2); | |
fbcc4bac JB |
591 | |
592 | if (mal_has_feature(mal, MAL_FTR_COMMON_ERR_INT)) { | |
593 | mal->txde_irq = mal->rxde_irq = mal->serr_irq; | |
594 | } else { | |
61c7a080 GL |
595 | mal->txde_irq = irq_of_parse_and_map(ofdev->dev.of_node, 3); |
596 | mal->rxde_irq = irq_of_parse_and_map(ofdev->dev.of_node, 4); | |
fbcc4bac JB |
597 | } |
598 | ||
99c1790e ME |
599 | if (!mal->txeob_irq || !mal->rxeob_irq || !mal->serr_irq || |
600 | !mal->txde_irq || !mal->rxde_irq) { | |
1d3bb996 DG |
601 | printk(KERN_ERR |
602 | "mal%d: failed to map interrupts !\n", index); | |
603 | err = -ENODEV; | |
604 | goto fail_unmap; | |
605 | } | |
606 | ||
607 | INIT_LIST_HEAD(&mal->poll_list); | |
1d3bb996 DG |
608 | INIT_LIST_HEAD(&mal->list); |
609 | spin_lock_init(&mal->lock); | |
610 | ||
937f1ba5 BH |
611 | init_dummy_netdev(&mal->dummy_dev); |
612 | ||
613 | netif_napi_add(&mal->dummy_dev, &mal->napi, mal_poll, | |
3b3bceef | 614 | CONFIG_IBM_EMAC_POLL_WEIGHT); |
b3e441c6 | 615 | |
1d3bb996 DG |
616 | /* Load power-on reset defaults */ |
617 | mal_reset(mal); | |
618 | ||
619 | /* Set the MAL configuration register */ | |
620 | cfg = (mal->version == 2) ? MAL2_CFG_DEFAULT : MAL1_CFG_DEFAULT; | |
621 | cfg |= MAL_CFG_PLBB | MAL_CFG_OPBBL | MAL_CFG_LEA; | |
622 | ||
623 | /* Current Axon is not happy with priority being non-0, it can | |
624 | * deadlock, fix it up here | |
625 | */ | |
61c7a080 | 626 | if (of_device_is_compatible(ofdev->dev.of_node, "ibm,mcmal-axon")) |
1d3bb996 DG |
627 | cfg &= ~(MAL2_CFG_RPP_10 | MAL2_CFG_WPP_10); |
628 | ||
629 | /* Apply configuration */ | |
630 | set_mal_dcrn(mal, MAL_CFG, cfg); | |
631 | ||
632 | /* Allocate space for BD rings */ | |
633 | BUG_ON(mal->num_tx_chans <= 0 || mal->num_tx_chans > 32); | |
634 | BUG_ON(mal->num_rx_chans <= 0 || mal->num_rx_chans > 32); | |
635 | ||
636 | bd_size = sizeof(struct mal_descriptor) * | |
637 | (NUM_TX_BUFF * mal->num_tx_chans + | |
638 | NUM_RX_BUFF * mal->num_rx_chans); | |
750afb08 LC |
639 | mal->bd_virt = dma_alloc_coherent(&ofdev->dev, bd_size, &mal->bd_dma, |
640 | GFP_KERNEL); | |
1d3bb996 | 641 | if (mal->bd_virt == NULL) { |
1d3bb996 DG |
642 | err = -ENOMEM; |
643 | goto fail_unmap; | |
644 | } | |
1d3bb996 DG |
645 | |
646 | for (i = 0; i < mal->num_tx_chans; ++i) | |
647 | set_mal_dcrn(mal, MAL_TXCTPR(i), mal->bd_dma + | |
648 | sizeof(struct mal_descriptor) * | |
649 | mal_tx_bd_offset(mal, i)); | |
650 | ||
651 | for (i = 0; i < mal->num_rx_chans; ++i) | |
652 | set_mal_dcrn(mal, MAL_RXCTPR(i), mal->bd_dma + | |
653 | sizeof(struct mal_descriptor) * | |
654 | mal_rx_bd_offset(mal, i)); | |
655 | ||
fbcc4bac JB |
656 | if (mal_has_feature(mal, MAL_FTR_COMMON_ERR_INT)) { |
657 | irqflags = IRQF_SHARED; | |
658 | hdlr_serr = hdlr_txde = hdlr_rxde = mal_int; | |
659 | } else { | |
660 | irqflags = 0; | |
661 | hdlr_serr = mal_serr; | |
662 | hdlr_txde = mal_txde; | |
663 | hdlr_rxde = mal_rxde; | |
664 | } | |
665 | ||
666 | err = request_irq(mal->serr_irq, hdlr_serr, irqflags, "MAL SERR", mal); | |
1d3bb996 DG |
667 | if (err) |
668 | goto fail2; | |
fbcc4bac | 669 | err = request_irq(mal->txde_irq, hdlr_txde, irqflags, "MAL TX DE", mal); |
1d3bb996 DG |
670 | if (err) |
671 | goto fail3; | |
672 | err = request_irq(mal->txeob_irq, mal_txeob, 0, "MAL TX EOB", mal); | |
673 | if (err) | |
674 | goto fail4; | |
fbcc4bac | 675 | err = request_irq(mal->rxde_irq, hdlr_rxde, irqflags, "MAL RX DE", mal); |
1d3bb996 DG |
676 | if (err) |
677 | goto fail5; | |
678 | err = request_irq(mal->rxeob_irq, mal_rxeob, 0, "MAL RX EOB", mal); | |
679 | if (err) | |
680 | goto fail6; | |
681 | ||
682 | /* Enable all MAL SERR interrupt sources */ | |
09271db6 | 683 | set_mal_dcrn(mal, MAL_IER, MAL_IER_EVENTS); |
1d3bb996 DG |
684 | |
685 | /* Enable EOB interrupt */ | |
686 | mal_enable_eob_irq(mal); | |
687 | ||
688 | printk(KERN_INFO | |
f7ce9103 RH |
689 | "MAL v%d %pOF, %d TX channels, %d RX channels\n", |
690 | mal->version, ofdev->dev.of_node, | |
1d3bb996 DG |
691 | mal->num_tx_chans, mal->num_rx_chans); |
692 | ||
693 | /* Advertise this instance to the rest of the world */ | |
694 | wmb(); | |
8513fbd8 | 695 | platform_set_drvdata(ofdev, mal); |
1d3bb996 | 696 | |
1d3bb996 DG |
697 | return 0; |
698 | ||
699 | fail6: | |
700 | free_irq(mal->rxde_irq, mal); | |
701 | fail5: | |
702 | free_irq(mal->txeob_irq, mal); | |
703 | fail4: | |
704 | free_irq(mal->txde_irq, mal); | |
705 | fail3: | |
706 | free_irq(mal->serr_irq, mal); | |
707 | fail2: | |
708 | dma_free_coherent(&ofdev->dev, bd_size, mal->bd_virt, mal->bd_dma); | |
709 | fail_unmap: | |
cdbd3865 | 710 | dcr_unmap(mal->dcr_host, 0x100); |
1d3bb996 DG |
711 | fail: |
712 | kfree(mal); | |
713 | ||
714 | return err; | |
715 | } | |
716 | ||
fe17dc1e | 717 | static int mal_remove(struct platform_device *ofdev) |
1d3bb996 | 718 | { |
8513fbd8 | 719 | struct mal_instance *mal = platform_get_drvdata(ofdev); |
1d3bb996 DG |
720 | |
721 | MAL_DBG(mal, "remove" NL); | |
722 | ||
59e90b2d RD |
723 | /* Synchronize with scheduled polling */ |
724 | napi_disable(&mal->napi); | |
1d3bb996 | 725 | |
f7c3f96a | 726 | if (!list_empty(&mal->list)) |
1d3bb996 | 727 | /* This is *very* bad */ |
f7c3f96a | 728 | WARN(1, KERN_EMERG |
1d3bb996 DG |
729 | "mal%d: commac list is not empty on remove!\n", |
730 | mal->index); | |
1d3bb996 | 731 | |
1d3bb996 DG |
732 | free_irq(mal->serr_irq, mal); |
733 | free_irq(mal->txde_irq, mal); | |
734 | free_irq(mal->txeob_irq, mal); | |
735 | free_irq(mal->rxde_irq, mal); | |
736 | free_irq(mal->rxeob_irq, mal); | |
737 | ||
738 | mal_reset(mal); | |
739 | ||
1d3bb996 DG |
740 | dma_free_coherent(&ofdev->dev, |
741 | sizeof(struct mal_descriptor) * | |
742 | (NUM_TX_BUFF * mal->num_tx_chans + | |
743 | NUM_RX_BUFF * mal->num_rx_chans), mal->bd_virt, | |
744 | mal->bd_dma); | |
745 | kfree(mal); | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
47b61667 | 750 | static const struct of_device_id mal_platform_match[] = |
1d3bb996 DG |
751 | { |
752 | { | |
753 | .compatible = "ibm,mcmal", | |
754 | }, | |
755 | { | |
756 | .compatible = "ibm,mcmal2", | |
757 | }, | |
758 | /* Backward compat */ | |
759 | { | |
760 | .type = "mcmal-dma", | |
761 | .compatible = "ibm,mcmal", | |
762 | }, | |
763 | { | |
764 | .type = "mcmal-dma", | |
765 | .compatible = "ibm,mcmal2", | |
766 | }, | |
767 | {}, | |
768 | }; | |
769 | ||
74888760 | 770 | static struct platform_driver mal_of_driver = { |
4018294b GL |
771 | .driver = { |
772 | .name = "mcmal", | |
4018294b GL |
773 | .of_match_table = mal_platform_match, |
774 | }, | |
1d3bb996 DG |
775 | .probe = mal_probe, |
776 | .remove = mal_remove, | |
777 | }; | |
778 | ||
779 | int __init mal_init(void) | |
780 | { | |
74888760 | 781 | return platform_driver_register(&mal_of_driver); |
1d3bb996 DG |
782 | } |
783 | ||
784 | void mal_exit(void) | |
785 | { | |
74888760 | 786 | platform_driver_unregister(&mal_of_driver); |
1d3bb996 | 787 | } |