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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Freescale QUICC Engine HDLC Device Driver
3 *
4 * Copyright 2016 Freescale Semiconductor Inc.
5 */
6
7#include <linux/delay.h>
8#include <linux/dma-mapping.h>
9#include <linux/hdlc.h>
10#include <linux/init.h>
11#include <linux/interrupt.h>
12#include <linux/io.h>
13#include <linux/irq.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/netdevice.h>
17#include <linux/of_address.h>
18#include <linux/of_irq.h>
19#include <linux/of_platform.h>
20#include <linux/platform_device.h>
21#include <linux/sched.h>
22#include <linux/skbuff.h>
23#include <linux/slab.h>
24#include <linux/spinlock.h>
25#include <linux/stddef.h>
26#include <soc/fsl/qe/qe_tdm.h>
27#include <uapi/linux/if_arp.h>
28
29#include "fsl_ucc_hdlc.h"
30
31#define DRV_DESC "Freescale QE UCC HDLC Driver"
32#define DRV_NAME "ucc_hdlc"
33
34#define TDM_PPPOHT_SLIC_MAXIN
35#define RX_BD_ERRORS (R_CD_S | R_OV_S | R_CR_S | R_AB_S | R_NO_S | R_LG_S)
36
37static int uhdlc_close(struct net_device *dev);
38
39static struct ucc_tdm_info utdm_primary_info = {
40 .uf_info = {
41 .tsa = 0,
42 .cdp = 0,
43 .cds = 1,
44 .ctsp = 1,
45 .ctss = 1,
46 .revd = 0,
47 .urfs = 256,
48 .utfs = 256,
49 .urfet = 128,
50 .urfset = 192,
51 .utfet = 128,
52 .utftt = 0x40,
53 .ufpt = 256,
54 .mode = UCC_FAST_PROTOCOL_MODE_HDLC,
55 .ttx_trx = UCC_FAST_GUMR_TRANSPARENT_TTX_TRX_NORMAL,
56 .tenc = UCC_FAST_TX_ENCODING_NRZ,
57 .renc = UCC_FAST_RX_ENCODING_NRZ,
58 .tcrc = UCC_FAST_16_BIT_CRC,
59 .synl = UCC_FAST_SYNC_LEN_NOT_USED,
60 },
61
62 .si_info = {
63#ifdef TDM_PPPOHT_SLIC_MAXIN
64 .simr_rfsd = 1,
65 .simr_tfsd = 2,
66#else
67 .simr_rfsd = 0,
68 .simr_tfsd = 0,
69#endif
70 .simr_crt = 0,
71 .simr_sl = 0,
72 .simr_ce = 1,
73 .simr_fe = 1,
74 .simr_gm = 0,
75 },
76};
77
78static struct ucc_tdm_info utdm_info[UCC_MAX_NUM];
79
80static int uhdlc_init(struct ucc_hdlc_private *priv)
81{
82 struct ucc_tdm_info *ut_info;
83 struct ucc_fast_info *uf_info;
84 u32 cecr_subblock;
85 u16 bd_status;
86 int ret, i;
87 void *bd_buffer;
88 dma_addr_t bd_dma_addr;
89 s32 riptr;
90 s32 tiptr;
91 u32 gumr;
92
93 ut_info = priv->ut_info;
94 uf_info = &ut_info->uf_info;
95
96 if (priv->tsa) {
97 uf_info->tsa = 1;
98 uf_info->ctsp = 1;
99 uf_info->cds = 1;
100 uf_info->ctss = 1;
101 } else {
102 uf_info->cds = 0;
103 uf_info->ctsp = 0;
104 uf_info->ctss = 0;
105 }
106
107 /* This sets HPM register in CMXUCR register which configures a
108 * open drain connected HDLC bus
109 */
110 if (priv->hdlc_bus)
111 uf_info->brkpt_support = 1;
112
113 uf_info->uccm_mask = ((UCC_HDLC_UCCE_RXB | UCC_HDLC_UCCE_RXF |
114 UCC_HDLC_UCCE_TXB) << 16);
115
116 ret = ucc_fast_init(uf_info, &priv->uccf);
117 if (ret) {
118 dev_err(priv->dev, "Failed to init uccf.");
119 return ret;
120 }
121
122 priv->uf_regs = priv->uccf->uf_regs;
123 ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
124
125 /* Loopback mode */
126 if (priv->loopback) {
127 dev_info(priv->dev, "Loopback Mode\n");
128 /* use the same clock when work in loopback */
129 qe_setbrg(ut_info->uf_info.rx_clock, 20000000, 1);
130
131 gumr = ioread32be(&priv->uf_regs->gumr);
132 gumr |= (UCC_FAST_GUMR_LOOPBACK | UCC_FAST_GUMR_CDS |
133 UCC_FAST_GUMR_TCI);
134 gumr &= ~(UCC_FAST_GUMR_CTSP | UCC_FAST_GUMR_RSYN);
135 iowrite32be(gumr, &priv->uf_regs->gumr);
136 }
137
138 /* Initialize SI */
139 if (priv->tsa)
140 ucc_tdm_init(priv->utdm, priv->ut_info);
141
142 /* Write to QE CECR, UCCx channel to Stop Transmission */
143 cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
144 ret = qe_issue_cmd(QE_STOP_TX, cecr_subblock,
145 QE_CR_PROTOCOL_UNSPECIFIED, 0);
146
147 /* Set UPSMR normal mode (need fixed)*/
148 iowrite32be(0, &priv->uf_regs->upsmr);
149
150 /* hdlc_bus mode */
151 if (priv->hdlc_bus) {
152 u32 upsmr;
153
154 dev_info(priv->dev, "HDLC bus Mode\n");
155 upsmr = ioread32be(&priv->uf_regs->upsmr);
156
157 /* bus mode and retransmit enable, with collision window
158 * set to 8 bytes
159 */
160 upsmr |= UCC_HDLC_UPSMR_RTE | UCC_HDLC_UPSMR_BUS |
161 UCC_HDLC_UPSMR_CW8;
162 iowrite32be(upsmr, &priv->uf_regs->upsmr);
163
164 /* explicitly disable CDS & CTSP */
165 gumr = ioread32be(&priv->uf_regs->gumr);
166 gumr &= ~(UCC_FAST_GUMR_CDS | UCC_FAST_GUMR_CTSP);
167 /* set automatic sync to explicitly ignore CD signal */
168 gumr |= UCC_FAST_GUMR_SYNL_AUTO;
169 iowrite32be(gumr, &priv->uf_regs->gumr);
170 }
171
172 priv->rx_ring_size = RX_BD_RING_LEN;
173 priv->tx_ring_size = TX_BD_RING_LEN;
174 /* Alloc Rx BD */
175 priv->rx_bd_base = dma_alloc_coherent(priv->dev,
176 RX_BD_RING_LEN * sizeof(struct qe_bd),
177 &priv->dma_rx_bd, GFP_KERNEL);
178
179 if (!priv->rx_bd_base) {
180 dev_err(priv->dev, "Cannot allocate MURAM memory for RxBDs\n");
181 ret = -ENOMEM;
182 goto free_uccf;
183 }
184
185 /* Alloc Tx BD */
186 priv->tx_bd_base = dma_alloc_coherent(priv->dev,
187 TX_BD_RING_LEN * sizeof(struct qe_bd),
188 &priv->dma_tx_bd, GFP_KERNEL);
189
190 if (!priv->tx_bd_base) {
191 dev_err(priv->dev, "Cannot allocate MURAM memory for TxBDs\n");
192 ret = -ENOMEM;
193 goto free_rx_bd;
194 }
195
196 /* Alloc parameter ram for ucc hdlc */
197 priv->ucc_pram_offset = qe_muram_alloc(sizeof(struct ucc_hdlc_param),
198 ALIGNMENT_OF_UCC_HDLC_PRAM);
199
200 if (priv->ucc_pram_offset < 0) {
201 dev_err(priv->dev, "Can not allocate MURAM for hdlc parameter.\n");
202 ret = -ENOMEM;
203 goto free_tx_bd;
204 }
205
206 priv->rx_skbuff = kcalloc(priv->rx_ring_size,
207 sizeof(*priv->rx_skbuff),
208 GFP_KERNEL);
209 if (!priv->rx_skbuff) {
210 ret = -ENOMEM;
211 goto free_ucc_pram;
212 }
213
214 priv->tx_skbuff = kcalloc(priv->tx_ring_size,
215 sizeof(*priv->tx_skbuff),
216 GFP_KERNEL);
217 if (!priv->tx_skbuff) {
218 ret = -ENOMEM;
219 goto free_rx_skbuff;
220 }
221
222 priv->skb_curtx = 0;
223 priv->skb_dirtytx = 0;
224 priv->curtx_bd = priv->tx_bd_base;
225 priv->dirty_tx = priv->tx_bd_base;
226 priv->currx_bd = priv->rx_bd_base;
227 priv->currx_bdnum = 0;
228
229 /* init parameter base */
230 cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
231 ret = qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
232 QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);
233
234 priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
235 qe_muram_addr(priv->ucc_pram_offset);
236
237 /* Zero out parameter ram */
238 memset_io(priv->ucc_pram, 0, sizeof(struct ucc_hdlc_param));
239
240 /* Alloc riptr, tiptr */
241 riptr = qe_muram_alloc(32, 32);
242 if (riptr < 0) {
243 dev_err(priv->dev, "Cannot allocate MURAM mem for Receive internal temp data pointer\n");
244 ret = -ENOMEM;
245 goto free_tx_skbuff;
246 }
247
248 tiptr = qe_muram_alloc(32, 32);
249 if (tiptr < 0) {
250 dev_err(priv->dev, "Cannot allocate MURAM mem for Transmit internal temp data pointer\n");
251 ret = -ENOMEM;
252 goto free_riptr;
253 }
254 if (riptr != (u16)riptr || tiptr != (u16)tiptr) {
255 dev_err(priv->dev, "MURAM allocation out of addressable range\n");
256 ret = -ENOMEM;
257 goto free_tiptr;
258 }
259
260 /* Set RIPTR, TIPTR */
261 iowrite16be(riptr, &priv->ucc_pram->riptr);
262 iowrite16be(tiptr, &priv->ucc_pram->tiptr);
263
264 /* Set MRBLR */
265 iowrite16be(MAX_RX_BUF_LENGTH, &priv->ucc_pram->mrblr);
266
267 /* Set RBASE, TBASE */
268 iowrite32be(priv->dma_rx_bd, &priv->ucc_pram->rbase);
269 iowrite32be(priv->dma_tx_bd, &priv->ucc_pram->tbase);
270
271 /* Set RSTATE, TSTATE */
272 iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->rstate);
273 iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->tstate);
274
275 /* Set C_MASK, C_PRES for 16bit CRC */
276 iowrite32be(CRC_16BIT_MASK, &priv->ucc_pram->c_mask);
277 iowrite32be(CRC_16BIT_PRES, &priv->ucc_pram->c_pres);
278
279 iowrite16be(MAX_FRAME_LENGTH, &priv->ucc_pram->mflr);
280 iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfthr);
281 iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfcnt);
282 iowrite16be(priv->hmask, &priv->ucc_pram->hmask);
283 iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr1);
284 iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr2);
285 iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr3);
286 iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr4);
287
288 /* Get BD buffer */
289 bd_buffer = dma_alloc_coherent(priv->dev,
290 (RX_BD_RING_LEN + TX_BD_RING_LEN) * MAX_RX_BUF_LENGTH,
291 &bd_dma_addr, GFP_KERNEL);
292
293 if (!bd_buffer) {
294 dev_err(priv->dev, "Could not allocate buffer descriptors\n");
295 ret = -ENOMEM;
296 goto free_tiptr;
297 }
298
299 priv->rx_buffer = bd_buffer;
300 priv->tx_buffer = bd_buffer + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;
301
302 priv->dma_rx_addr = bd_dma_addr;
303 priv->dma_tx_addr = bd_dma_addr + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;
304
305 for (i = 0; i < RX_BD_RING_LEN; i++) {
306 if (i < (RX_BD_RING_LEN - 1))
307 bd_status = R_E_S | R_I_S;
308 else
309 bd_status = R_E_S | R_I_S | R_W_S;
310
311 priv->rx_bd_base[i].status = cpu_to_be16(bd_status);
312 priv->rx_bd_base[i].buf = cpu_to_be32(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH);
313 }
314
315 for (i = 0; i < TX_BD_RING_LEN; i++) {
316 if (i < (TX_BD_RING_LEN - 1))
317 bd_status = T_I_S | T_TC_S;
318 else
319 bd_status = T_I_S | T_TC_S | T_W_S;
320
321 priv->tx_bd_base[i].status = cpu_to_be16(bd_status);
322 priv->tx_bd_base[i].buf = cpu_to_be32(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH);
323 }
324 dma_wmb();
325
326 return 0;
327
328free_tiptr:
329 qe_muram_free(tiptr);
330free_riptr:
331 qe_muram_free(riptr);
332free_tx_skbuff:
333 kfree(priv->tx_skbuff);
334free_rx_skbuff:
335 kfree(priv->rx_skbuff);
336free_ucc_pram:
337 qe_muram_free(priv->ucc_pram_offset);
338free_tx_bd:
339 dma_free_coherent(priv->dev,
340 TX_BD_RING_LEN * sizeof(struct qe_bd),
341 priv->tx_bd_base, priv->dma_tx_bd);
342free_rx_bd:
343 dma_free_coherent(priv->dev,
344 RX_BD_RING_LEN * sizeof(struct qe_bd),
345 priv->rx_bd_base, priv->dma_rx_bd);
346free_uccf:
347 ucc_fast_free(priv->uccf);
348
349 return ret;
350}
351
352static netdev_tx_t ucc_hdlc_tx(struct sk_buff *skb, struct net_device *dev)
353{
354 hdlc_device *hdlc = dev_to_hdlc(dev);
355 struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)hdlc->priv;
356 struct qe_bd *bd;
357 u16 bd_status;
358 unsigned long flags;
359 __be16 *proto_head;
360
361 switch (dev->type) {
362 case ARPHRD_RAWHDLC:
363 if (skb_headroom(skb) < HDLC_HEAD_LEN) {
364 dev->stats.tx_dropped++;
365 dev_kfree_skb(skb);
366 netdev_err(dev, "No enough space for hdlc head\n");
367 return -ENOMEM;
368 }
369
370 skb_push(skb, HDLC_HEAD_LEN);
371
372 proto_head = (__be16 *)skb->data;
373 *proto_head = htons(DEFAULT_HDLC_HEAD);
374
375 dev->stats.tx_bytes += skb->len;
376 break;
377
378 case ARPHRD_PPP:
379 proto_head = (__be16 *)skb->data;
380 if (*proto_head != htons(DEFAULT_PPP_HEAD)) {
381 dev->stats.tx_dropped++;
382 dev_kfree_skb(skb);
383 netdev_err(dev, "Wrong ppp header\n");
384 return -ENOMEM;
385 }
386
387 dev->stats.tx_bytes += skb->len;
388 break;
389
390 case ARPHRD_ETHER:
391 dev->stats.tx_bytes += skb->len;
392 break;
393
394 default:
395 dev->stats.tx_dropped++;
396 dev_kfree_skb(skb);
397 return -ENOMEM;
398 }
399 netdev_sent_queue(dev, skb->len);
400 spin_lock_irqsave(&priv->lock, flags);
401
402 dma_rmb();
403 /* Start from the next BD that should be filled */
404 bd = priv->curtx_bd;
405 bd_status = be16_to_cpu(bd->status);
406 /* Save the skb pointer so we can free it later */
407 priv->tx_skbuff[priv->skb_curtx] = skb;
408
409 /* Update the current skb pointer (wrapping if this was the last) */
410 priv->skb_curtx =
411 (priv->skb_curtx + 1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);
412
413 /* copy skb data to tx buffer for sdma processing */
414 memcpy(priv->tx_buffer + (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
415 skb->data, skb->len);
416
417 /* set bd status and length */
418 bd_status = (bd_status & T_W_S) | T_R_S | T_I_S | T_L_S | T_TC_S;
419
420 bd->length = cpu_to_be16(skb->len);
421 bd->status = cpu_to_be16(bd_status);
422
423 /* Move to next BD in the ring */
424 if (!(bd_status & T_W_S))
425 bd += 1;
426 else
427 bd = priv->tx_bd_base;
428
429 if (bd == priv->dirty_tx) {
430 if (!netif_queue_stopped(dev))
431 netif_stop_queue(dev);
432 }
433
434 priv->curtx_bd = bd;
435
436 spin_unlock_irqrestore(&priv->lock, flags);
437
438 return NETDEV_TX_OK;
439}
440
441static int hdlc_tx_restart(struct ucc_hdlc_private *priv)
442{
443 u32 cecr_subblock;
444
445 cecr_subblock =
446 ucc_fast_get_qe_cr_subblock(priv->ut_info->uf_info.ucc_num);
447
448 qe_issue_cmd(QE_RESTART_TX, cecr_subblock,
449 QE_CR_PROTOCOL_UNSPECIFIED, 0);
450 return 0;
451}
452
453static int hdlc_tx_done(struct ucc_hdlc_private *priv)
454{
455 /* Start from the next BD that should be filled */
456 struct net_device *dev = priv->ndev;
457 unsigned int bytes_sent = 0;
458 int howmany = 0;
459 struct qe_bd *bd; /* BD pointer */
460 u16 bd_status;
461 int tx_restart = 0;
462
463 dma_rmb();
464 bd = priv->dirty_tx;
465 bd_status = be16_to_cpu(bd->status);
466
467 /* Normal processing. */
468 while ((bd_status & T_R_S) == 0) {
469 struct sk_buff *skb;
470
471 if (bd_status & T_UN_S) { /* Underrun */
472 dev->stats.tx_fifo_errors++;
473 tx_restart = 1;
474 }
475 if (bd_status & T_CT_S) { /* Carrier lost */
476 dev->stats.tx_carrier_errors++;
477 tx_restart = 1;
478 }
479
480 /* BD contains already transmitted buffer. */
481 /* Handle the transmitted buffer and release */
482 /* the BD to be used with the current frame */
483
484 skb = priv->tx_skbuff[priv->skb_dirtytx];
485 if (!skb)
486 break;
487 howmany++;
488 bytes_sent += skb->len;
489 dev->stats.tx_packets++;
490 memset(priv->tx_buffer +
491 (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
492 0, skb->len);
493 dev_consume_skb_irq(skb);
494
495 priv->tx_skbuff[priv->skb_dirtytx] = NULL;
496 priv->skb_dirtytx =
497 (priv->skb_dirtytx +
498 1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);
499
500 /* We freed a buffer, so now we can restart transmission */
501 if (netif_queue_stopped(dev))
502 netif_wake_queue(dev);
503
504 /* Advance the confirmation BD pointer */
505 if (!(bd_status & T_W_S))
506 bd += 1;
507 else
508 bd = priv->tx_bd_base;
509 bd_status = be16_to_cpu(bd->status);
510 }
511 priv->dirty_tx = bd;
512
513 if (tx_restart)
514 hdlc_tx_restart(priv);
515
516 netdev_completed_queue(dev, howmany, bytes_sent);
517 return 0;
518}
519
520static int hdlc_rx_done(struct ucc_hdlc_private *priv, int rx_work_limit)
521{
522 struct net_device *dev = priv->ndev;
523 struct sk_buff *skb = NULL;
524 hdlc_device *hdlc = dev_to_hdlc(dev);
525 struct qe_bd *bd;
526 u16 bd_status;
527 u16 length, howmany = 0;
528 u8 *bdbuffer;
529
530 dma_rmb();
531 bd = priv->currx_bd;
532 bd_status = be16_to_cpu(bd->status);
533
534 /* while there are received buffers and BD is full (~R_E) */
535 while (!((bd_status & (R_E_S)) || (--rx_work_limit < 0))) {
536 if (bd_status & (RX_BD_ERRORS)) {
537 dev->stats.rx_errors++;
538
539 if (bd_status & R_CD_S)
540 dev->stats.collisions++;
541 if (bd_status & R_OV_S)
542 dev->stats.rx_fifo_errors++;
543 if (bd_status & R_CR_S)
544 dev->stats.rx_crc_errors++;
545 if (bd_status & R_AB_S)
546 dev->stats.rx_over_errors++;
547 if (bd_status & R_NO_S)
548 dev->stats.rx_frame_errors++;
549 if (bd_status & R_LG_S)
550 dev->stats.rx_length_errors++;
551
552 goto recycle;
553 }
554 bdbuffer = priv->rx_buffer +
555 (priv->currx_bdnum * MAX_RX_BUF_LENGTH);
556 length = be16_to_cpu(bd->length);
557
558 switch (dev->type) {
559 case ARPHRD_RAWHDLC:
560 bdbuffer += HDLC_HEAD_LEN;
561 length -= (HDLC_HEAD_LEN + HDLC_CRC_SIZE);
562
563 skb = dev_alloc_skb(length);
564 if (!skb) {
565 dev->stats.rx_dropped++;
566 return -ENOMEM;
567 }
568
569 skb_put(skb, length);
570 skb->len = length;
571 skb->dev = dev;
572 memcpy(skb->data, bdbuffer, length);
573 break;
574
575 case ARPHRD_PPP:
576 case ARPHRD_ETHER:
577 length -= HDLC_CRC_SIZE;
578
579 skb = dev_alloc_skb(length);
580 if (!skb) {
581 dev->stats.rx_dropped++;
582 return -ENOMEM;
583 }
584
585 skb_put(skb, length);
586 skb->len = length;
587 skb->dev = dev;
588 memcpy(skb->data, bdbuffer, length);
589 break;
590 }
591
592 dev->stats.rx_packets++;
593 dev->stats.rx_bytes += skb->len;
594 howmany++;
595 if (hdlc->proto)
596 skb->protocol = hdlc_type_trans(skb, dev);
597 netif_receive_skb(skb);
598
599recycle:
600 bd->status = cpu_to_be16((bd_status & R_W_S) | R_E_S | R_I_S);
601
602 /* update to point at the next bd */
603 if (bd_status & R_W_S) {
604 priv->currx_bdnum = 0;
605 bd = priv->rx_bd_base;
606 } else {
607 if (priv->currx_bdnum < (RX_BD_RING_LEN - 1))
608 priv->currx_bdnum += 1;
609 else
610 priv->currx_bdnum = RX_BD_RING_LEN - 1;
611
612 bd += 1;
613 }
614
615 bd_status = be16_to_cpu(bd->status);
616 }
617 dma_rmb();
618
619 priv->currx_bd = bd;
620 return howmany;
621}
622
623static int ucc_hdlc_poll(struct napi_struct *napi, int budget)
624{
625 struct ucc_hdlc_private *priv = container_of(napi,
626 struct ucc_hdlc_private,
627 napi);
628 int howmany;
629
630 /* Tx event processing */
631 spin_lock(&priv->lock);
632 hdlc_tx_done(priv);
633 spin_unlock(&priv->lock);
634
635 howmany = 0;
636 howmany += hdlc_rx_done(priv, budget - howmany);
637
638 if (howmany < budget) {
639 napi_complete_done(napi, howmany);
640 qe_setbits_be32(priv->uccf->p_uccm,
641 (UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS) << 16);
642 }
643
644 return howmany;
645}
646
647static irqreturn_t ucc_hdlc_irq_handler(int irq, void *dev_id)
648{
649 struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)dev_id;
650 struct net_device *dev = priv->ndev;
651 struct ucc_fast_private *uccf;
652 u32 ucce;
653 u32 uccm;
654
655 uccf = priv->uccf;
656
657 ucce = ioread32be(uccf->p_ucce);
658 uccm = ioread32be(uccf->p_uccm);
659 ucce &= uccm;
660 iowrite32be(ucce, uccf->p_ucce);
661 if (!ucce)
662 return IRQ_NONE;
663
664 if ((ucce >> 16) & (UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS)) {
665 if (napi_schedule_prep(&priv->napi)) {
666 uccm &= ~((UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS)
667 << 16);
668 iowrite32be(uccm, uccf->p_uccm);
669 __napi_schedule(&priv->napi);
670 }
671 }
672
673 /* Errors and other events */
674 if (ucce >> 16 & UCC_HDLC_UCCE_BSY)
675 dev->stats.rx_missed_errors++;
676 if (ucce >> 16 & UCC_HDLC_UCCE_TXE)
677 dev->stats.tx_errors++;
678
679 return IRQ_HANDLED;
680}
681
682static int uhdlc_ioctl(struct net_device *dev, struct if_settings *ifs)
683{
684 const size_t size = sizeof(te1_settings);
685 te1_settings line;
686 struct ucc_hdlc_private *priv = netdev_priv(dev);
687
688 switch (ifs->type) {
689 case IF_GET_IFACE:
690 ifs->type = IF_IFACE_E1;
691 if (ifs->size < size) {
692 ifs->size = size; /* data size wanted */
693 return -ENOBUFS;
694 }
695 memset(&line, 0, sizeof(line));
696 line.clock_type = priv->clocking;
697
698 if (copy_to_user(ifs->ifs_ifsu.sync, &line, size))
699 return -EFAULT;
700 return 0;
701
702 default:
703 return hdlc_ioctl(dev, ifs);
704 }
705}
706
707static int uhdlc_open(struct net_device *dev)
708{
709 u32 cecr_subblock;
710 hdlc_device *hdlc = dev_to_hdlc(dev);
711 struct ucc_hdlc_private *priv = hdlc->priv;
712 struct ucc_tdm *utdm = priv->utdm;
713 int rc = 0;
714
715 if (priv->hdlc_busy != 1) {
716 if (request_irq(priv->ut_info->uf_info.irq,
717 ucc_hdlc_irq_handler, 0, "hdlc", priv))
718 return -ENODEV;
719
720 cecr_subblock = ucc_fast_get_qe_cr_subblock(
721 priv->ut_info->uf_info.ucc_num);
722
723 qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
724 QE_CR_PROTOCOL_UNSPECIFIED, 0);
725
726 ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
727
728 /* Enable the TDM port */
729 if (priv->tsa)
730 qe_setbits_8(&utdm->si_regs->siglmr1_h, 0x1 << utdm->tdm_port);
731
732 priv->hdlc_busy = 1;
733 netif_device_attach(priv->ndev);
734 napi_enable(&priv->napi);
735 netdev_reset_queue(dev);
736 netif_start_queue(dev);
737
738 rc = hdlc_open(dev);
739 if (rc)
740 uhdlc_close(dev);
741 }
742
743 return rc;
744}
745
746static void uhdlc_memclean(struct ucc_hdlc_private *priv)
747{
748 qe_muram_free(ioread16be(&priv->ucc_pram->riptr));
749 qe_muram_free(ioread16be(&priv->ucc_pram->tiptr));
750
751 if (priv->rx_bd_base) {
752 dma_free_coherent(priv->dev,
753 RX_BD_RING_LEN * sizeof(struct qe_bd),
754 priv->rx_bd_base, priv->dma_rx_bd);
755
756 priv->rx_bd_base = NULL;
757 priv->dma_rx_bd = 0;
758 }
759
760 if (priv->tx_bd_base) {
761 dma_free_coherent(priv->dev,
762 TX_BD_RING_LEN * sizeof(struct qe_bd),
763 priv->tx_bd_base, priv->dma_tx_bd);
764
765 priv->tx_bd_base = NULL;
766 priv->dma_tx_bd = 0;
767 }
768
769 if (priv->ucc_pram) {
770 qe_muram_free(priv->ucc_pram_offset);
771 priv->ucc_pram = NULL;
772 priv->ucc_pram_offset = 0;
773 }
774
775 kfree(priv->rx_skbuff);
776 priv->rx_skbuff = NULL;
777
778 kfree(priv->tx_skbuff);
779 priv->tx_skbuff = NULL;
780
781 if (priv->uf_regs) {
782 iounmap(priv->uf_regs);
783 priv->uf_regs = NULL;
784 }
785
786 if (priv->uccf) {
787 ucc_fast_free(priv->uccf);
788 priv->uccf = NULL;
789 }
790
791 if (priv->rx_buffer) {
792 dma_free_coherent(priv->dev,
793 RX_BD_RING_LEN * MAX_RX_BUF_LENGTH,
794 priv->rx_buffer, priv->dma_rx_addr);
795 priv->rx_buffer = NULL;
796 priv->dma_rx_addr = 0;
797 }
798
799 if (priv->tx_buffer) {
800 dma_free_coherent(priv->dev,
801 TX_BD_RING_LEN * MAX_RX_BUF_LENGTH,
802 priv->tx_buffer, priv->dma_tx_addr);
803 priv->tx_buffer = NULL;
804 priv->dma_tx_addr = 0;
805 }
806}
807
808static int uhdlc_close(struct net_device *dev)
809{
810 struct ucc_hdlc_private *priv = dev_to_hdlc(dev)->priv;
811 struct ucc_tdm *utdm = priv->utdm;
812 u32 cecr_subblock;
813
814 napi_disable(&priv->napi);
815 cecr_subblock = ucc_fast_get_qe_cr_subblock(
816 priv->ut_info->uf_info.ucc_num);
817
818 qe_issue_cmd(QE_GRACEFUL_STOP_TX, cecr_subblock,
819 (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
820 qe_issue_cmd(QE_CLOSE_RX_BD, cecr_subblock,
821 (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
822
823 if (priv->tsa)
824 qe_clrbits_8(&utdm->si_regs->siglmr1_h, 0x1 << utdm->tdm_port);
825
826 ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
827
828 free_irq(priv->ut_info->uf_info.irq, priv);
829 netif_stop_queue(dev);
830 netdev_reset_queue(dev);
831 priv->hdlc_busy = 0;
832
833 hdlc_close(dev);
834
835 return 0;
836}
837
838static int ucc_hdlc_attach(struct net_device *dev, unsigned short encoding,
839 unsigned short parity)
840{
841 struct ucc_hdlc_private *priv = dev_to_hdlc(dev)->priv;
842
843 if (encoding != ENCODING_NRZ &&
844 encoding != ENCODING_NRZI)
845 return -EINVAL;
846
847 if (parity != PARITY_NONE &&
848 parity != PARITY_CRC32_PR1_CCITT &&
849 parity != PARITY_CRC16_PR0_CCITT &&
850 parity != PARITY_CRC16_PR1_CCITT)
851 return -EINVAL;
852
853 priv->encoding = encoding;
854 priv->parity = parity;
855
856 return 0;
857}
858
859#ifdef CONFIG_PM
860static void store_clk_config(struct ucc_hdlc_private *priv)
861{
862 struct qe_mux __iomem *qe_mux_reg = &qe_immr->qmx;
863
864 /* store si clk */
865 priv->cmxsi1cr_h = ioread32be(&qe_mux_reg->cmxsi1cr_h);
866 priv->cmxsi1cr_l = ioread32be(&qe_mux_reg->cmxsi1cr_l);
867
868 /* store si sync */
869 priv->cmxsi1syr = ioread32be(&qe_mux_reg->cmxsi1syr);
870
871 /* store ucc clk */
872 memcpy_fromio(priv->cmxucr, qe_mux_reg->cmxucr, 4 * sizeof(u32));
873}
874
875static void resume_clk_config(struct ucc_hdlc_private *priv)
876{
877 struct qe_mux __iomem *qe_mux_reg = &qe_immr->qmx;
878
879 memcpy_toio(qe_mux_reg->cmxucr, priv->cmxucr, 4 * sizeof(u32));
880
881 iowrite32be(priv->cmxsi1cr_h, &qe_mux_reg->cmxsi1cr_h);
882 iowrite32be(priv->cmxsi1cr_l, &qe_mux_reg->cmxsi1cr_l);
883
884 iowrite32be(priv->cmxsi1syr, &qe_mux_reg->cmxsi1syr);
885}
886
887static int uhdlc_suspend(struct device *dev)
888{
889 struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
890 struct ucc_fast __iomem *uf_regs;
891
892 if (!priv)
893 return -EINVAL;
894
895 if (!netif_running(priv->ndev))
896 return 0;
897
898 netif_device_detach(priv->ndev);
899 napi_disable(&priv->napi);
900
901 uf_regs = priv->uf_regs;
902
903 /* backup gumr guemr*/
904 priv->gumr = ioread32be(&uf_regs->gumr);
905 priv->guemr = ioread8(&uf_regs->guemr);
906
907 priv->ucc_pram_bak = kmalloc(sizeof(*priv->ucc_pram_bak),
908 GFP_KERNEL);
909 if (!priv->ucc_pram_bak)
910 return -ENOMEM;
911
912 /* backup HDLC parameter */
913 memcpy_fromio(priv->ucc_pram_bak, priv->ucc_pram,
914 sizeof(struct ucc_hdlc_param));
915
916 /* store the clk configuration */
917 store_clk_config(priv);
918
919 /* save power */
920 ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
921
922 return 0;
923}
924
925static int uhdlc_resume(struct device *dev)
926{
927 struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
928 struct ucc_tdm *utdm;
929 struct ucc_tdm_info *ut_info;
930 struct ucc_fast __iomem *uf_regs;
931 struct ucc_fast_private *uccf;
932 struct ucc_fast_info *uf_info;
933 int i;
934 u32 cecr_subblock;
935 u16 bd_status;
936
937 if (!priv)
938 return -EINVAL;
939
940 if (!netif_running(priv->ndev))
941 return 0;
942
943 utdm = priv->utdm;
944 ut_info = priv->ut_info;
945 uf_info = &ut_info->uf_info;
946 uf_regs = priv->uf_regs;
947 uccf = priv->uccf;
948
949 /* restore gumr guemr */
950 iowrite8(priv->guemr, &uf_regs->guemr);
951 iowrite32be(priv->gumr, &uf_regs->gumr);
952
953 /* Set Virtual Fifo registers */
954 iowrite16be(uf_info->urfs, &uf_regs->urfs);
955 iowrite16be(uf_info->urfet, &uf_regs->urfet);
956 iowrite16be(uf_info->urfset, &uf_regs->urfset);
957 iowrite16be(uf_info->utfs, &uf_regs->utfs);
958 iowrite16be(uf_info->utfet, &uf_regs->utfet);
959 iowrite16be(uf_info->utftt, &uf_regs->utftt);
960 /* utfb, urfb are offsets from MURAM base */
961 iowrite32be(uccf->ucc_fast_tx_virtual_fifo_base_offset, &uf_regs->utfb);
962 iowrite32be(uccf->ucc_fast_rx_virtual_fifo_base_offset, &uf_regs->urfb);
963
964 /* Rx Tx and sync clock routing */
965 resume_clk_config(priv);
966
967 iowrite32be(uf_info->uccm_mask, &uf_regs->uccm);
968 iowrite32be(0xffffffff, &uf_regs->ucce);
969
970 ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
971
972 /* rebuild SIRAM */
973 if (priv->tsa)
974 ucc_tdm_init(priv->utdm, priv->ut_info);
975
976 /* Write to QE CECR, UCCx channel to Stop Transmission */
977 cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
978 qe_issue_cmd(QE_STOP_TX, cecr_subblock,
979 (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
980
981 /* Set UPSMR normal mode */
982 iowrite32be(0, &uf_regs->upsmr);
983
984 /* init parameter base */
985 cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
986 qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
987 QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);
988
989 priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
990 qe_muram_addr(priv->ucc_pram_offset);
991
992 /* restore ucc parameter */
993 memcpy_toio(priv->ucc_pram, priv->ucc_pram_bak,
994 sizeof(struct ucc_hdlc_param));
995 kfree(priv->ucc_pram_bak);
996
997 /* rebuild BD entry */
998 for (i = 0; i < RX_BD_RING_LEN; i++) {
999 if (i < (RX_BD_RING_LEN - 1))
1000 bd_status = R_E_S | R_I_S;
1001 else
1002 bd_status = R_E_S | R_I_S | R_W_S;
1003
1004 priv->rx_bd_base[i].status = cpu_to_be16(bd_status);
1005 priv->rx_bd_base[i].buf = cpu_to_be32(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH);
1006 }
1007
1008 for (i = 0; i < TX_BD_RING_LEN; i++) {
1009 if (i < (TX_BD_RING_LEN - 1))
1010 bd_status = T_I_S | T_TC_S;
1011 else
1012 bd_status = T_I_S | T_TC_S | T_W_S;
1013
1014 priv->tx_bd_base[i].status = cpu_to_be16(bd_status);
1015 priv->tx_bd_base[i].buf = cpu_to_be32(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH);
1016 }
1017 dma_wmb();
1018
1019 /* if hdlc is busy enable TX and RX */
1020 if (priv->hdlc_busy == 1) {
1021 cecr_subblock = ucc_fast_get_qe_cr_subblock(
1022 priv->ut_info->uf_info.ucc_num);
1023
1024 qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
1025 (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
1026
1027 ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
1028
1029 /* Enable the TDM port */
1030 if (priv->tsa)
1031 qe_setbits_8(&utdm->si_regs->siglmr1_h, 0x1 << utdm->tdm_port);
1032 }
1033
1034 napi_enable(&priv->napi);
1035 netif_device_attach(priv->ndev);
1036
1037 return 0;
1038}
1039
1040static const struct dev_pm_ops uhdlc_pm_ops = {
1041 .suspend = uhdlc_suspend,
1042 .resume = uhdlc_resume,
1043 .freeze = uhdlc_suspend,
1044 .thaw = uhdlc_resume,
1045};
1046
1047#define HDLC_PM_OPS (&uhdlc_pm_ops)
1048
1049#else
1050
1051#define HDLC_PM_OPS NULL
1052
1053#endif
1054static void uhdlc_tx_timeout(struct net_device *ndev, unsigned int txqueue)
1055{
1056 netdev_err(ndev, "%s\n", __func__);
1057}
1058
1059static const struct net_device_ops uhdlc_ops = {
1060 .ndo_open = uhdlc_open,
1061 .ndo_stop = uhdlc_close,
1062 .ndo_start_xmit = hdlc_start_xmit,
1063 .ndo_siocwandev = uhdlc_ioctl,
1064 .ndo_tx_timeout = uhdlc_tx_timeout,
1065};
1066
1067static int hdlc_map_iomem(char *name, int init_flag, void __iomem **ptr)
1068{
1069 struct device_node *np;
1070 struct platform_device *pdev;
1071 struct resource *res;
1072 static int siram_init_flag;
1073 int ret = 0;
1074
1075 np = of_find_compatible_node(NULL, NULL, name);
1076 if (!np)
1077 return -EINVAL;
1078
1079 pdev = of_find_device_by_node(np);
1080 if (!pdev) {
1081 pr_err("%pOFn: failed to lookup pdev\n", np);
1082 of_node_put(np);
1083 return -EINVAL;
1084 }
1085
1086 of_node_put(np);
1087 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1088 if (!res) {
1089 ret = -EINVAL;
1090 goto error_put_device;
1091 }
1092 *ptr = ioremap(res->start, resource_size(res));
1093 if (!*ptr) {
1094 ret = -ENOMEM;
1095 goto error_put_device;
1096 }
1097
1098 /* We've remapped the addresses, and we don't need the device any
1099 * more, so we should release it.
1100 */
1101 put_device(&pdev->dev);
1102
1103 if (init_flag && siram_init_flag == 0) {
1104 memset_io(*ptr, 0, resource_size(res));
1105 siram_init_flag = 1;
1106 }
1107 return 0;
1108
1109error_put_device:
1110 put_device(&pdev->dev);
1111
1112 return ret;
1113}
1114
1115static int ucc_hdlc_probe(struct platform_device *pdev)
1116{
1117 struct device_node *np = pdev->dev.of_node;
1118 struct ucc_hdlc_private *uhdlc_priv = NULL;
1119 struct ucc_tdm_info *ut_info;
1120 struct ucc_tdm *utdm = NULL;
1121 struct resource res;
1122 struct net_device *dev;
1123 hdlc_device *hdlc;
1124 int ucc_num;
1125 const char *sprop;
1126 int ret;
1127 u32 val;
1128
1129 ret = of_property_read_u32_index(np, "cell-index", 0, &val);
1130 if (ret) {
1131 dev_err(&pdev->dev, "Invalid ucc property\n");
1132 return -ENODEV;
1133 }
1134
1135 ucc_num = val - 1;
1136 if (ucc_num > (UCC_MAX_NUM - 1) || ucc_num < 0) {
1137 dev_err(&pdev->dev, ": Invalid UCC num\n");
1138 return -EINVAL;
1139 }
1140
1141 memcpy(&utdm_info[ucc_num], &utdm_primary_info,
1142 sizeof(utdm_primary_info));
1143
1144 ut_info = &utdm_info[ucc_num];
1145 ut_info->uf_info.ucc_num = ucc_num;
1146
1147 sprop = of_get_property(np, "rx-clock-name", NULL);
1148 if (sprop) {
1149 ut_info->uf_info.rx_clock = qe_clock_source(sprop);
1150 if ((ut_info->uf_info.rx_clock < QE_CLK_NONE) ||
1151 (ut_info->uf_info.rx_clock > QE_CLK24)) {
1152 dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
1153 return -EINVAL;
1154 }
1155 } else {
1156 dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
1157 return -EINVAL;
1158 }
1159
1160 sprop = of_get_property(np, "tx-clock-name", NULL);
1161 if (sprop) {
1162 ut_info->uf_info.tx_clock = qe_clock_source(sprop);
1163 if ((ut_info->uf_info.tx_clock < QE_CLK_NONE) ||
1164 (ut_info->uf_info.tx_clock > QE_CLK24)) {
1165 dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
1166 return -EINVAL;
1167 }
1168 } else {
1169 dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
1170 return -EINVAL;
1171 }
1172
1173 ret = of_address_to_resource(np, 0, &res);
1174 if (ret)
1175 return -EINVAL;
1176
1177 ut_info->uf_info.regs = res.start;
1178 ut_info->uf_info.irq = irq_of_parse_and_map(np, 0);
1179
1180 uhdlc_priv = kzalloc(sizeof(*uhdlc_priv), GFP_KERNEL);
1181 if (!uhdlc_priv)
1182 return -ENOMEM;
1183
1184 dev_set_drvdata(&pdev->dev, uhdlc_priv);
1185 uhdlc_priv->dev = &pdev->dev;
1186 uhdlc_priv->ut_info = ut_info;
1187
1188 uhdlc_priv->tsa = of_property_read_bool(np, "fsl,tdm-interface");
1189 uhdlc_priv->loopback = of_property_read_bool(np, "fsl,ucc-internal-loopback");
1190 uhdlc_priv->hdlc_bus = of_property_read_bool(np, "fsl,hdlc-bus");
1191
1192 if (uhdlc_priv->tsa == 1) {
1193 utdm = kzalloc(sizeof(*utdm), GFP_KERNEL);
1194 if (!utdm) {
1195 ret = -ENOMEM;
1196 dev_err(&pdev->dev, "No mem to alloc ucc tdm data\n");
1197 goto free_uhdlc_priv;
1198 }
1199 uhdlc_priv->utdm = utdm;
1200 ret = ucc_of_parse_tdm(np, utdm, ut_info);
1201 if (ret)
1202 goto free_utdm;
1203
1204 ret = hdlc_map_iomem("fsl,t1040-qe-si", 0,
1205 (void __iomem **)&utdm->si_regs);
1206 if (ret)
1207 goto free_utdm;
1208 ret = hdlc_map_iomem("fsl,t1040-qe-siram", 1,
1209 (void __iomem **)&utdm->siram);
1210 if (ret)
1211 goto unmap_si_regs;
1212 }
1213
1214 if (of_property_read_u16(np, "fsl,hmask", &uhdlc_priv->hmask))
1215 uhdlc_priv->hmask = DEFAULT_ADDR_MASK;
1216
1217 ret = uhdlc_init(uhdlc_priv);
1218 if (ret) {
1219 dev_err(&pdev->dev, "Failed to init uhdlc\n");
1220 goto undo_uhdlc_init;
1221 }
1222
1223 dev = alloc_hdlcdev(uhdlc_priv);
1224 if (!dev) {
1225 ret = -ENOMEM;
1226 pr_err("ucc_hdlc: unable to allocate memory\n");
1227 goto undo_uhdlc_init;
1228 }
1229
1230 uhdlc_priv->ndev = dev;
1231 hdlc = dev_to_hdlc(dev);
1232 dev->tx_queue_len = 16;
1233 dev->netdev_ops = &uhdlc_ops;
1234 dev->watchdog_timeo = 2 * HZ;
1235 hdlc->attach = ucc_hdlc_attach;
1236 hdlc->xmit = ucc_hdlc_tx;
1237 netif_napi_add_weight(dev, &uhdlc_priv->napi, ucc_hdlc_poll, 32);
1238 if (register_hdlc_device(dev)) {
1239 ret = -ENOBUFS;
1240 pr_err("ucc_hdlc: unable to register hdlc device\n");
1241 goto free_dev;
1242 }
1243
1244 return 0;
1245
1246free_dev:
1247 free_netdev(dev);
1248undo_uhdlc_init:
1249 if (utdm)
1250 iounmap(utdm->siram);
1251unmap_si_regs:
1252 if (utdm)
1253 iounmap(utdm->si_regs);
1254free_utdm:
1255 if (uhdlc_priv->tsa)
1256 kfree(utdm);
1257free_uhdlc_priv:
1258 kfree(uhdlc_priv);
1259 return ret;
1260}
1261
1262static void ucc_hdlc_remove(struct platform_device *pdev)
1263{
1264 struct ucc_hdlc_private *priv = dev_get_drvdata(&pdev->dev);
1265
1266 uhdlc_memclean(priv);
1267
1268 if (priv->utdm->si_regs) {
1269 iounmap(priv->utdm->si_regs);
1270 priv->utdm->si_regs = NULL;
1271 }
1272
1273 if (priv->utdm->siram) {
1274 iounmap(priv->utdm->siram);
1275 priv->utdm->siram = NULL;
1276 }
1277 kfree(priv);
1278
1279 dev_info(&pdev->dev, "UCC based hdlc module removed\n");
1280}
1281
1282static const struct of_device_id fsl_ucc_hdlc_of_match[] = {
1283 {
1284 .compatible = "fsl,ucc-hdlc",
1285 },
1286 {},
1287};
1288
1289MODULE_DEVICE_TABLE(of, fsl_ucc_hdlc_of_match);
1290
1291static struct platform_driver ucc_hdlc_driver = {
1292 .probe = ucc_hdlc_probe,
1293 .remove_new = ucc_hdlc_remove,
1294 .driver = {
1295 .name = DRV_NAME,
1296 .pm = HDLC_PM_OPS,
1297 .of_match_table = fsl_ucc_hdlc_of_match,
1298 },
1299};
1300
1301module_platform_driver(ucc_hdlc_driver);
1302MODULE_LICENSE("GPL");
1303MODULE_DESCRIPTION(DRV_DESC);
1/* Freescale QUICC Engine HDLC Device Driver
2 *
3 * Copyright 2016 Freescale Semiconductor Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 */
10
11#include <linux/delay.h>
12#include <linux/dma-mapping.h>
13#include <linux/hdlc.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/irq.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/netdevice.h>
21#include <linux/of_address.h>
22#include <linux/of_irq.h>
23#include <linux/of_platform.h>
24#include <linux/platform_device.h>
25#include <linux/sched.h>
26#include <linux/skbuff.h>
27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <linux/stddef.h>
30#include <soc/fsl/qe/qe_tdm.h>
31#include <uapi/linux/if_arp.h>
32
33#include "fsl_ucc_hdlc.h"
34
35#define DRV_DESC "Freescale QE UCC HDLC Driver"
36#define DRV_NAME "ucc_hdlc"
37
38#define TDM_PPPOHT_SLIC_MAXIN
39#define BROKEN_FRAME_INFO
40
41static struct ucc_tdm_info utdm_primary_info = {
42 .uf_info = {
43 .tsa = 0,
44 .cdp = 0,
45 .cds = 1,
46 .ctsp = 1,
47 .ctss = 1,
48 .revd = 0,
49 .urfs = 256,
50 .utfs = 256,
51 .urfet = 128,
52 .urfset = 192,
53 .utfet = 128,
54 .utftt = 0x40,
55 .ufpt = 256,
56 .mode = UCC_FAST_PROTOCOL_MODE_HDLC,
57 .ttx_trx = UCC_FAST_GUMR_TRANSPARENT_TTX_TRX_NORMAL,
58 .tenc = UCC_FAST_TX_ENCODING_NRZ,
59 .renc = UCC_FAST_RX_ENCODING_NRZ,
60 .tcrc = UCC_FAST_16_BIT_CRC,
61 .synl = UCC_FAST_SYNC_LEN_NOT_USED,
62 },
63
64 .si_info = {
65#ifdef TDM_PPPOHT_SLIC_MAXIN
66 .simr_rfsd = 1,
67 .simr_tfsd = 2,
68#else
69 .simr_rfsd = 0,
70 .simr_tfsd = 0,
71#endif
72 .simr_crt = 0,
73 .simr_sl = 0,
74 .simr_ce = 1,
75 .simr_fe = 1,
76 .simr_gm = 0,
77 },
78};
79
80static struct ucc_tdm_info utdm_info[MAX_HDLC_NUM];
81
82static int uhdlc_init(struct ucc_hdlc_private *priv)
83{
84 struct ucc_tdm_info *ut_info;
85 struct ucc_fast_info *uf_info;
86 u32 cecr_subblock;
87 u16 bd_status;
88 int ret, i;
89 void *bd_buffer;
90 dma_addr_t bd_dma_addr;
91 u32 riptr;
92 u32 tiptr;
93 u32 gumr;
94
95 ut_info = priv->ut_info;
96 uf_info = &ut_info->uf_info;
97
98 if (priv->tsa) {
99 uf_info->tsa = 1;
100 uf_info->ctsp = 1;
101 }
102 uf_info->uccm_mask = ((UCC_HDLC_UCCE_RXB | UCC_HDLC_UCCE_RXF |
103 UCC_HDLC_UCCE_TXB) << 16);
104
105 ret = ucc_fast_init(uf_info, &priv->uccf);
106 if (ret) {
107 dev_err(priv->dev, "Failed to init uccf.");
108 return ret;
109 }
110
111 priv->uf_regs = priv->uccf->uf_regs;
112 ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
113
114 /* Loopback mode */
115 if (priv->loopback) {
116 dev_info(priv->dev, "Loopback Mode\n");
117 gumr = ioread32be(&priv->uf_regs->gumr);
118 gumr |= (UCC_FAST_GUMR_LOOPBACK | UCC_FAST_GUMR_CDS |
119 UCC_FAST_GUMR_TCI);
120 gumr &= ~(UCC_FAST_GUMR_CTSP | UCC_FAST_GUMR_RSYN);
121 iowrite32be(gumr, &priv->uf_regs->gumr);
122 }
123
124 /* Initialize SI */
125 if (priv->tsa)
126 ucc_tdm_init(priv->utdm, priv->ut_info);
127
128 /* Write to QE CECR, UCCx channel to Stop Transmission */
129 cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
130 ret = qe_issue_cmd(QE_STOP_TX, cecr_subblock,
131 QE_CR_PROTOCOL_UNSPECIFIED, 0);
132
133 /* Set UPSMR normal mode (need fixed)*/
134 iowrite32be(0, &priv->uf_regs->upsmr);
135
136 priv->rx_ring_size = RX_BD_RING_LEN;
137 priv->tx_ring_size = TX_BD_RING_LEN;
138 /* Alloc Rx BD */
139 priv->rx_bd_base = dma_alloc_coherent(priv->dev,
140 RX_BD_RING_LEN * sizeof(struct qe_bd *),
141 &priv->dma_rx_bd, GFP_KERNEL);
142
143 if (!priv->rx_bd_base) {
144 dev_err(priv->dev, "Cannot allocate MURAM memory for RxBDs\n");
145 ret = -ENOMEM;
146 goto free_uccf;
147 }
148
149 /* Alloc Tx BD */
150 priv->tx_bd_base = dma_alloc_coherent(priv->dev,
151 TX_BD_RING_LEN * sizeof(struct qe_bd *),
152 &priv->dma_tx_bd, GFP_KERNEL);
153
154 if (!priv->tx_bd_base) {
155 dev_err(priv->dev, "Cannot allocate MURAM memory for TxBDs\n");
156 ret = -ENOMEM;
157 goto free_rx_bd;
158 }
159
160 /* Alloc parameter ram for ucc hdlc */
161 priv->ucc_pram_offset = qe_muram_alloc(sizeof(priv->ucc_pram),
162 ALIGNMENT_OF_UCC_HDLC_PRAM);
163
164 if (priv->ucc_pram_offset < 0) {
165 dev_err(priv->dev, "Can not allocate MURAM for hdlc parameter.\n");
166 ret = -ENOMEM;
167 goto free_tx_bd;
168 }
169
170 priv->rx_skbuff = kzalloc(priv->rx_ring_size * sizeof(*priv->rx_skbuff),
171 GFP_KERNEL);
172 if (!priv->rx_skbuff)
173 goto free_ucc_pram;
174
175 priv->tx_skbuff = kzalloc(priv->tx_ring_size * sizeof(*priv->tx_skbuff),
176 GFP_KERNEL);
177 if (!priv->tx_skbuff)
178 goto free_rx_skbuff;
179
180 priv->skb_curtx = 0;
181 priv->skb_dirtytx = 0;
182 priv->curtx_bd = priv->tx_bd_base;
183 priv->dirty_tx = priv->tx_bd_base;
184 priv->currx_bd = priv->rx_bd_base;
185 priv->currx_bdnum = 0;
186
187 /* init parameter base */
188 cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
189 ret = qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
190 QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);
191
192 priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
193 qe_muram_addr(priv->ucc_pram_offset);
194
195 /* Zero out parameter ram */
196 memset_io(priv->ucc_pram, 0, sizeof(struct ucc_hdlc_param));
197
198 /* Alloc riptr, tiptr */
199 riptr = qe_muram_alloc(32, 32);
200 if (riptr < 0) {
201 dev_err(priv->dev, "Cannot allocate MURAM mem for Receive internal temp data pointer\n");
202 ret = -ENOMEM;
203 goto free_tx_skbuff;
204 }
205
206 tiptr = qe_muram_alloc(32, 32);
207 if (tiptr < 0) {
208 dev_err(priv->dev, "Cannot allocate MURAM mem for Transmit internal temp data pointer\n");
209 ret = -ENOMEM;
210 goto free_riptr;
211 }
212
213 /* Set RIPTR, TIPTR */
214 iowrite16be(riptr, &priv->ucc_pram->riptr);
215 iowrite16be(tiptr, &priv->ucc_pram->tiptr);
216
217 /* Set MRBLR */
218 iowrite16be(MAX_RX_BUF_LENGTH, &priv->ucc_pram->mrblr);
219
220 /* Set RBASE, TBASE */
221 iowrite32be(priv->dma_rx_bd, &priv->ucc_pram->rbase);
222 iowrite32be(priv->dma_tx_bd, &priv->ucc_pram->tbase);
223
224 /* Set RSTATE, TSTATE */
225 iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->rstate);
226 iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->tstate);
227
228 /* Set C_MASK, C_PRES for 16bit CRC */
229 iowrite32be(CRC_16BIT_MASK, &priv->ucc_pram->c_mask);
230 iowrite32be(CRC_16BIT_PRES, &priv->ucc_pram->c_pres);
231
232 iowrite16be(MAX_FRAME_LENGTH, &priv->ucc_pram->mflr);
233 iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfthr);
234 iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfcnt);
235 iowrite16be(DEFAULT_ADDR_MASK, &priv->ucc_pram->hmask);
236 iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr1);
237 iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr2);
238 iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr3);
239 iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr4);
240
241 /* Get BD buffer */
242 bd_buffer = dma_alloc_coherent(priv->dev,
243 (RX_BD_RING_LEN + TX_BD_RING_LEN) *
244 MAX_RX_BUF_LENGTH,
245 &bd_dma_addr, GFP_KERNEL);
246
247 if (!bd_buffer) {
248 dev_err(priv->dev, "Could not allocate buffer descriptors\n");
249 ret = -ENOMEM;
250 goto free_tiptr;
251 }
252
253 memset(bd_buffer, 0, (RX_BD_RING_LEN + TX_BD_RING_LEN)
254 * MAX_RX_BUF_LENGTH);
255
256 priv->rx_buffer = bd_buffer;
257 priv->tx_buffer = bd_buffer + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;
258
259 priv->dma_rx_addr = bd_dma_addr;
260 priv->dma_tx_addr = bd_dma_addr + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;
261
262 for (i = 0; i < RX_BD_RING_LEN; i++) {
263 if (i < (RX_BD_RING_LEN - 1))
264 bd_status = R_E_S | R_I_S;
265 else
266 bd_status = R_E_S | R_I_S | R_W_S;
267
268 iowrite16be(bd_status, &priv->rx_bd_base[i].status);
269 iowrite32be(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH,
270 &priv->rx_bd_base[i].buf);
271 }
272
273 for (i = 0; i < TX_BD_RING_LEN; i++) {
274 if (i < (TX_BD_RING_LEN - 1))
275 bd_status = T_I_S | T_TC_S;
276 else
277 bd_status = T_I_S | T_TC_S | T_W_S;
278
279 iowrite16be(bd_status, &priv->tx_bd_base[i].status);
280 iowrite32be(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH,
281 &priv->tx_bd_base[i].buf);
282 }
283
284 return 0;
285
286free_tiptr:
287 qe_muram_free(tiptr);
288free_riptr:
289 qe_muram_free(riptr);
290free_tx_skbuff:
291 kfree(priv->tx_skbuff);
292free_rx_skbuff:
293 kfree(priv->rx_skbuff);
294free_ucc_pram:
295 qe_muram_free(priv->ucc_pram_offset);
296free_tx_bd:
297 dma_free_coherent(priv->dev,
298 TX_BD_RING_LEN * sizeof(struct qe_bd *),
299 priv->tx_bd_base, priv->dma_tx_bd);
300free_rx_bd:
301 dma_free_coherent(priv->dev,
302 RX_BD_RING_LEN * sizeof(struct qe_bd *),
303 priv->rx_bd_base, priv->dma_rx_bd);
304free_uccf:
305 ucc_fast_free(priv->uccf);
306
307 return ret;
308}
309
310static netdev_tx_t ucc_hdlc_tx(struct sk_buff *skb, struct net_device *dev)
311{
312 hdlc_device *hdlc = dev_to_hdlc(dev);
313 struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)hdlc->priv;
314 struct qe_bd __iomem *bd;
315 u16 bd_status;
316 unsigned long flags;
317 u8 *send_buf;
318 int i;
319 u16 *proto_head;
320
321 switch (dev->type) {
322 case ARPHRD_RAWHDLC:
323 if (skb_headroom(skb) < HDLC_HEAD_LEN) {
324 dev->stats.tx_dropped++;
325 dev_kfree_skb(skb);
326 netdev_err(dev, "No enough space for hdlc head\n");
327 return -ENOMEM;
328 }
329
330 skb_push(skb, HDLC_HEAD_LEN);
331
332 proto_head = (u16 *)skb->data;
333 *proto_head = htons(DEFAULT_HDLC_HEAD);
334
335 dev->stats.tx_bytes += skb->len;
336 break;
337
338 case ARPHRD_PPP:
339 proto_head = (u16 *)skb->data;
340 if (*proto_head != htons(DEFAULT_PPP_HEAD)) {
341 dev->stats.tx_dropped++;
342 dev_kfree_skb(skb);
343 netdev_err(dev, "Wrong ppp header\n");
344 return -ENOMEM;
345 }
346
347 dev->stats.tx_bytes += skb->len;
348 break;
349
350 default:
351 dev->stats.tx_dropped++;
352 dev_kfree_skb(skb);
353 return -ENOMEM;
354 }
355
356 pr_info("Tx data skb->len:%d ", skb->len);
357 send_buf = (u8 *)skb->data;
358 pr_info("\nTransmitted data:\n");
359 for (i = 0; i < 16; i++) {
360 if (i == skb->len)
361 pr_info("++++");
362 else
363 pr_info("%02x\n", send_buf[i]);
364 }
365 spin_lock_irqsave(&priv->lock, flags);
366
367 /* Start from the next BD that should be filled */
368 bd = priv->curtx_bd;
369 bd_status = ioread16be(&bd->status);
370 /* Save the skb pointer so we can free it later */
371 priv->tx_skbuff[priv->skb_curtx] = skb;
372
373 /* Update the current skb pointer (wrapping if this was the last) */
374 priv->skb_curtx =
375 (priv->skb_curtx + 1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);
376
377 /* copy skb data to tx buffer for sdma processing */
378 memcpy(priv->tx_buffer + (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
379 skb->data, skb->len);
380
381 /* set bd status and length */
382 bd_status = (bd_status & T_W_S) | T_R_S | T_I_S | T_L_S | T_TC_S;
383
384 iowrite16be(bd_status, &bd->status);
385 iowrite16be(skb->len, &bd->length);
386
387 /* Move to next BD in the ring */
388 if (!(bd_status & T_W_S))
389 bd += 1;
390 else
391 bd = priv->tx_bd_base;
392
393 if (bd == priv->dirty_tx) {
394 if (!netif_queue_stopped(dev))
395 netif_stop_queue(dev);
396 }
397
398 priv->curtx_bd = bd;
399
400 spin_unlock_irqrestore(&priv->lock, flags);
401
402 return NETDEV_TX_OK;
403}
404
405static int hdlc_tx_done(struct ucc_hdlc_private *priv)
406{
407 /* Start from the next BD that should be filled */
408 struct net_device *dev = priv->ndev;
409 struct qe_bd *bd; /* BD pointer */
410 u16 bd_status;
411
412 bd = priv->dirty_tx;
413 bd_status = ioread16be(&bd->status);
414
415 /* Normal processing. */
416 while ((bd_status & T_R_S) == 0) {
417 struct sk_buff *skb;
418
419 /* BD contains already transmitted buffer. */
420 /* Handle the transmitted buffer and release */
421 /* the BD to be used with the current frame */
422
423 skb = priv->tx_skbuff[priv->skb_dirtytx];
424 if (!skb)
425 break;
426 pr_info("TxBD: %x\n", bd_status);
427 dev->stats.tx_packets++;
428 memset(priv->tx_buffer +
429 (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
430 0, skb->len);
431 dev_kfree_skb_irq(skb);
432
433 priv->tx_skbuff[priv->skb_dirtytx] = NULL;
434 priv->skb_dirtytx =
435 (priv->skb_dirtytx +
436 1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);
437
438 /* We freed a buffer, so now we can restart transmission */
439 if (netif_queue_stopped(dev))
440 netif_wake_queue(dev);
441
442 /* Advance the confirmation BD pointer */
443 if (!(bd_status & T_W_S))
444 bd += 1;
445 else
446 bd = priv->tx_bd_base;
447 bd_status = ioread16be(&bd->status);
448 }
449 priv->dirty_tx = bd;
450
451 return 0;
452}
453
454static int hdlc_rx_done(struct ucc_hdlc_private *priv, int rx_work_limit)
455{
456 struct net_device *dev = priv->ndev;
457 struct sk_buff *skb;
458 hdlc_device *hdlc = dev_to_hdlc(dev);
459 struct qe_bd *bd;
460 u32 bd_status;
461 u16 length, howmany = 0;
462 u8 *bdbuffer;
463 int i;
464 static int entry;
465
466 bd = priv->currx_bd;
467 bd_status = ioread16be(&bd->status);
468
469 /* while there are received buffers and BD is full (~R_E) */
470 while (!((bd_status & (R_E_S)) || (--rx_work_limit < 0))) {
471 if (bd_status & R_OV_S)
472 dev->stats.rx_over_errors++;
473 if (bd_status & R_CR_S) {
474#ifdef BROKEN_FRAME_INFO
475 pr_info("Broken Frame with RxBD: %x\n", bd_status);
476#endif
477 dev->stats.rx_crc_errors++;
478 dev->stats.rx_dropped++;
479 goto recycle;
480 }
481 bdbuffer = priv->rx_buffer +
482 (priv->currx_bdnum * MAX_RX_BUF_LENGTH);
483 length = ioread16be(&bd->length);
484
485 pr_info("Received data length:%d", length);
486 pr_info("while entry times:%d", entry++);
487
488 pr_info("\nReceived data:\n");
489 for (i = 0; (i < 16); i++) {
490 if (i == length)
491 pr_info("++++");
492 else
493 pr_info("%02x\n", bdbuffer[i]);
494 }
495
496 switch (dev->type) {
497 case ARPHRD_RAWHDLC:
498 bdbuffer += HDLC_HEAD_LEN;
499 length -= (HDLC_HEAD_LEN + HDLC_CRC_SIZE);
500
501 skb = dev_alloc_skb(length);
502 if (!skb) {
503 dev->stats.rx_dropped++;
504 return -ENOMEM;
505 }
506
507 skb_put(skb, length);
508 skb->len = length;
509 skb->dev = dev;
510 memcpy(skb->data, bdbuffer, length);
511 break;
512
513 case ARPHRD_PPP:
514 length -= HDLC_CRC_SIZE;
515
516 skb = dev_alloc_skb(length);
517 if (!skb) {
518 dev->stats.rx_dropped++;
519 return -ENOMEM;
520 }
521
522 skb_put(skb, length);
523 skb->len = length;
524 skb->dev = dev;
525 memcpy(skb->data, bdbuffer, length);
526 break;
527 }
528
529 dev->stats.rx_packets++;
530 dev->stats.rx_bytes += skb->len;
531 howmany++;
532 if (hdlc->proto)
533 skb->protocol = hdlc_type_trans(skb, dev);
534 pr_info("skb->protocol:%x\n", skb->protocol);
535 netif_receive_skb(skb);
536
537recycle:
538 iowrite16be(bd_status | R_E_S | R_I_S, &bd->status);
539
540 /* update to point at the next bd */
541 if (bd_status & R_W_S) {
542 priv->currx_bdnum = 0;
543 bd = priv->rx_bd_base;
544 } else {
545 if (priv->currx_bdnum < (RX_BD_RING_LEN - 1))
546 priv->currx_bdnum += 1;
547 else
548 priv->currx_bdnum = RX_BD_RING_LEN - 1;
549
550 bd += 1;
551 }
552
553 bd_status = ioread16be(&bd->status);
554 }
555
556 priv->currx_bd = bd;
557 return howmany;
558}
559
560static int ucc_hdlc_poll(struct napi_struct *napi, int budget)
561{
562 struct ucc_hdlc_private *priv = container_of(napi,
563 struct ucc_hdlc_private,
564 napi);
565 int howmany;
566
567 /* Tx event processing */
568 spin_lock(&priv->lock);
569 hdlc_tx_done(priv);
570 spin_unlock(&priv->lock);
571
572 howmany = 0;
573 howmany += hdlc_rx_done(priv, budget - howmany);
574
575 if (howmany < budget) {
576 napi_complete(napi);
577 qe_setbits32(priv->uccf->p_uccm,
578 (UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS) << 16);
579 }
580
581 return howmany;
582}
583
584static irqreturn_t ucc_hdlc_irq_handler(int irq, void *dev_id)
585{
586 struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)dev_id;
587 struct net_device *dev = priv->ndev;
588 struct ucc_fast_private *uccf;
589 struct ucc_tdm_info *ut_info;
590 u32 ucce;
591 u32 uccm;
592
593 ut_info = priv->ut_info;
594 uccf = priv->uccf;
595
596 ucce = ioread32be(uccf->p_ucce);
597 uccm = ioread32be(uccf->p_uccm);
598 ucce &= uccm;
599 iowrite32be(ucce, uccf->p_ucce);
600 pr_info("irq ucce:%x\n", ucce);
601 if (!ucce)
602 return IRQ_NONE;
603
604 if ((ucce >> 16) & (UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS)) {
605 if (napi_schedule_prep(&priv->napi)) {
606 uccm &= ~((UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS)
607 << 16);
608 iowrite32be(uccm, uccf->p_uccm);
609 __napi_schedule(&priv->napi);
610 }
611 }
612
613 /* Errors and other events */
614 if (ucce >> 16 & UCC_HDLC_UCCE_BSY)
615 dev->stats.rx_errors++;
616 if (ucce >> 16 & UCC_HDLC_UCCE_TXE)
617 dev->stats.tx_errors++;
618
619 return IRQ_HANDLED;
620}
621
622static int uhdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
623{
624 const size_t size = sizeof(te1_settings);
625 te1_settings line;
626 struct ucc_hdlc_private *priv = netdev_priv(dev);
627
628 if (cmd != SIOCWANDEV)
629 return hdlc_ioctl(dev, ifr, cmd);
630
631 switch (ifr->ifr_settings.type) {
632 case IF_GET_IFACE:
633 ifr->ifr_settings.type = IF_IFACE_E1;
634 if (ifr->ifr_settings.size < size) {
635 ifr->ifr_settings.size = size; /* data size wanted */
636 return -ENOBUFS;
637 }
638 memset(&line, 0, sizeof(line));
639 line.clock_type = priv->clocking;
640
641 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.sync, &line, size))
642 return -EFAULT;
643 return 0;
644
645 default:
646 return hdlc_ioctl(dev, ifr, cmd);
647 }
648}
649
650static int uhdlc_open(struct net_device *dev)
651{
652 u32 cecr_subblock;
653 hdlc_device *hdlc = dev_to_hdlc(dev);
654 struct ucc_hdlc_private *priv = hdlc->priv;
655 struct ucc_tdm *utdm = priv->utdm;
656
657 if (priv->hdlc_busy != 1) {
658 if (request_irq(priv->ut_info->uf_info.irq,
659 ucc_hdlc_irq_handler, 0, "hdlc", priv))
660 return -ENODEV;
661
662 cecr_subblock = ucc_fast_get_qe_cr_subblock(
663 priv->ut_info->uf_info.ucc_num);
664
665 qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
666 QE_CR_PROTOCOL_UNSPECIFIED, 0);
667
668 ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
669
670 /* Enable the TDM port */
671 if (priv->tsa)
672 utdm->si_regs->siglmr1_h |= (0x1 << utdm->tdm_port);
673
674 priv->hdlc_busy = 1;
675 netif_device_attach(priv->ndev);
676 napi_enable(&priv->napi);
677 netif_start_queue(dev);
678 hdlc_open(dev);
679 }
680
681 return 0;
682}
683
684static void uhdlc_memclean(struct ucc_hdlc_private *priv)
685{
686 qe_muram_free(priv->ucc_pram->riptr);
687 qe_muram_free(priv->ucc_pram->tiptr);
688
689 if (priv->rx_bd_base) {
690 dma_free_coherent(priv->dev,
691 RX_BD_RING_LEN * sizeof(struct qe_bd *),
692 priv->rx_bd_base, priv->dma_rx_bd);
693
694 priv->rx_bd_base = NULL;
695 priv->dma_rx_bd = 0;
696 }
697
698 if (priv->tx_bd_base) {
699 dma_free_coherent(priv->dev,
700 TX_BD_RING_LEN * sizeof(struct qe_bd *),
701 priv->tx_bd_base, priv->dma_tx_bd);
702
703 priv->tx_bd_base = NULL;
704 priv->dma_tx_bd = 0;
705 }
706
707 if (priv->ucc_pram) {
708 qe_muram_free(priv->ucc_pram_offset);
709 priv->ucc_pram = NULL;
710 priv->ucc_pram_offset = 0;
711 }
712
713 kfree(priv->rx_skbuff);
714 priv->rx_skbuff = NULL;
715
716 kfree(priv->tx_skbuff);
717 priv->tx_skbuff = NULL;
718
719 if (priv->uf_regs) {
720 iounmap(priv->uf_regs);
721 priv->uf_regs = NULL;
722 }
723
724 if (priv->uccf) {
725 ucc_fast_free(priv->uccf);
726 priv->uccf = NULL;
727 }
728
729 if (priv->rx_buffer) {
730 dma_free_coherent(priv->dev,
731 RX_BD_RING_LEN * MAX_RX_BUF_LENGTH,
732 priv->rx_buffer, priv->dma_rx_addr);
733 priv->rx_buffer = NULL;
734 priv->dma_rx_addr = 0;
735 }
736
737 if (priv->tx_buffer) {
738 dma_free_coherent(priv->dev,
739 TX_BD_RING_LEN * MAX_RX_BUF_LENGTH,
740 priv->tx_buffer, priv->dma_tx_addr);
741 priv->tx_buffer = NULL;
742 priv->dma_tx_addr = 0;
743 }
744}
745
746static int uhdlc_close(struct net_device *dev)
747{
748 struct ucc_hdlc_private *priv = dev_to_hdlc(dev)->priv;
749 struct ucc_tdm *utdm = priv->utdm;
750 u32 cecr_subblock;
751
752 napi_disable(&priv->napi);
753 cecr_subblock = ucc_fast_get_qe_cr_subblock(
754 priv->ut_info->uf_info.ucc_num);
755
756 qe_issue_cmd(QE_GRACEFUL_STOP_TX, cecr_subblock,
757 (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
758 qe_issue_cmd(QE_CLOSE_RX_BD, cecr_subblock,
759 (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
760
761 if (priv->tsa)
762 utdm->si_regs->siglmr1_h &= ~(0x1 << utdm->tdm_port);
763
764 ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
765
766 free_irq(priv->ut_info->uf_info.irq, priv);
767 netif_stop_queue(dev);
768 priv->hdlc_busy = 0;
769
770 return 0;
771}
772
773static int ucc_hdlc_attach(struct net_device *dev, unsigned short encoding,
774 unsigned short parity)
775{
776 struct ucc_hdlc_private *priv = dev_to_hdlc(dev)->priv;
777
778 if (encoding != ENCODING_NRZ &&
779 encoding != ENCODING_NRZI)
780 return -EINVAL;
781
782 if (parity != PARITY_NONE &&
783 parity != PARITY_CRC32_PR1_CCITT &&
784 parity != PARITY_CRC16_PR1_CCITT)
785 return -EINVAL;
786
787 priv->encoding = encoding;
788 priv->parity = parity;
789
790 return 0;
791}
792
793#ifdef CONFIG_PM
794static void store_clk_config(struct ucc_hdlc_private *priv)
795{
796 struct qe_mux *qe_mux_reg = &qe_immr->qmx;
797
798 /* store si clk */
799 priv->cmxsi1cr_h = ioread32be(&qe_mux_reg->cmxsi1cr_h);
800 priv->cmxsi1cr_l = ioread32be(&qe_mux_reg->cmxsi1cr_l);
801
802 /* store si sync */
803 priv->cmxsi1syr = ioread32be(&qe_mux_reg->cmxsi1syr);
804
805 /* store ucc clk */
806 memcpy_fromio(priv->cmxucr, qe_mux_reg->cmxucr, 4 * sizeof(u32));
807}
808
809static void resume_clk_config(struct ucc_hdlc_private *priv)
810{
811 struct qe_mux *qe_mux_reg = &qe_immr->qmx;
812
813 memcpy_toio(qe_mux_reg->cmxucr, priv->cmxucr, 4 * sizeof(u32));
814
815 iowrite32be(priv->cmxsi1cr_h, &qe_mux_reg->cmxsi1cr_h);
816 iowrite32be(priv->cmxsi1cr_l, &qe_mux_reg->cmxsi1cr_l);
817
818 iowrite32be(priv->cmxsi1syr, &qe_mux_reg->cmxsi1syr);
819}
820
821static int uhdlc_suspend(struct device *dev)
822{
823 struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
824 struct ucc_tdm_info *ut_info;
825 struct ucc_fast __iomem *uf_regs;
826
827 if (!priv)
828 return -EINVAL;
829
830 if (!netif_running(priv->ndev))
831 return 0;
832
833 netif_device_detach(priv->ndev);
834 napi_disable(&priv->napi);
835
836 ut_info = priv->ut_info;
837 uf_regs = priv->uf_regs;
838
839 /* backup gumr guemr*/
840 priv->gumr = ioread32be(&uf_regs->gumr);
841 priv->guemr = ioread8(&uf_regs->guemr);
842
843 priv->ucc_pram_bak = kmalloc(sizeof(*priv->ucc_pram_bak),
844 GFP_KERNEL);
845 if (!priv->ucc_pram_bak)
846 return -ENOMEM;
847
848 /* backup HDLC parameter */
849 memcpy_fromio(priv->ucc_pram_bak, priv->ucc_pram,
850 sizeof(struct ucc_hdlc_param));
851
852 /* store the clk configuration */
853 store_clk_config(priv);
854
855 /* save power */
856 ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
857
858 dev_dbg(dev, "ucc hdlc suspend\n");
859 return 0;
860}
861
862static int uhdlc_resume(struct device *dev)
863{
864 struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
865 struct ucc_tdm *utdm;
866 struct ucc_tdm_info *ut_info;
867 struct ucc_fast __iomem *uf_regs;
868 struct ucc_fast_private *uccf;
869 struct ucc_fast_info *uf_info;
870 int ret, i;
871 u32 cecr_subblock;
872 u16 bd_status;
873
874 if (!priv)
875 return -EINVAL;
876
877 if (!netif_running(priv->ndev))
878 return 0;
879
880 utdm = priv->utdm;
881 ut_info = priv->ut_info;
882 uf_info = &ut_info->uf_info;
883 uf_regs = priv->uf_regs;
884 uccf = priv->uccf;
885
886 /* restore gumr guemr */
887 iowrite8(priv->guemr, &uf_regs->guemr);
888 iowrite32be(priv->gumr, &uf_regs->gumr);
889
890 /* Set Virtual Fifo registers */
891 iowrite16be(uf_info->urfs, &uf_regs->urfs);
892 iowrite16be(uf_info->urfet, &uf_regs->urfet);
893 iowrite16be(uf_info->urfset, &uf_regs->urfset);
894 iowrite16be(uf_info->utfs, &uf_regs->utfs);
895 iowrite16be(uf_info->utfet, &uf_regs->utfet);
896 iowrite16be(uf_info->utftt, &uf_regs->utftt);
897 /* utfb, urfb are offsets from MURAM base */
898 iowrite32be(uccf->ucc_fast_tx_virtual_fifo_base_offset, &uf_regs->utfb);
899 iowrite32be(uccf->ucc_fast_rx_virtual_fifo_base_offset, &uf_regs->urfb);
900
901 /* Rx Tx and sync clock routing */
902 resume_clk_config(priv);
903
904 iowrite32be(uf_info->uccm_mask, &uf_regs->uccm);
905 iowrite32be(0xffffffff, &uf_regs->ucce);
906
907 ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
908
909 /* rebuild SIRAM */
910 if (priv->tsa)
911 ucc_tdm_init(priv->utdm, priv->ut_info);
912
913 /* Write to QE CECR, UCCx channel to Stop Transmission */
914 cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
915 ret = qe_issue_cmd(QE_STOP_TX, cecr_subblock,
916 (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
917
918 /* Set UPSMR normal mode */
919 iowrite32be(0, &uf_regs->upsmr);
920
921 /* init parameter base */
922 cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
923 ret = qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
924 QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);
925
926 priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
927 qe_muram_addr(priv->ucc_pram_offset);
928
929 /* restore ucc parameter */
930 memcpy_toio(priv->ucc_pram, priv->ucc_pram_bak,
931 sizeof(struct ucc_hdlc_param));
932 kfree(priv->ucc_pram_bak);
933
934 /* rebuild BD entry */
935 for (i = 0; i < RX_BD_RING_LEN; i++) {
936 if (i < (RX_BD_RING_LEN - 1))
937 bd_status = R_E_S | R_I_S;
938 else
939 bd_status = R_E_S | R_I_S | R_W_S;
940
941 iowrite16be(bd_status, &priv->rx_bd_base[i].status);
942 iowrite32be(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH,
943 &priv->rx_bd_base[i].buf);
944 }
945
946 for (i = 0; i < TX_BD_RING_LEN; i++) {
947 if (i < (TX_BD_RING_LEN - 1))
948 bd_status = T_I_S | T_TC_S;
949 else
950 bd_status = T_I_S | T_TC_S | T_W_S;
951
952 iowrite16be(bd_status, &priv->tx_bd_base[i].status);
953 iowrite32be(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH,
954 &priv->tx_bd_base[i].buf);
955 }
956
957 /* if hdlc is busy enable TX and RX */
958 if (priv->hdlc_busy == 1) {
959 cecr_subblock = ucc_fast_get_qe_cr_subblock(
960 priv->ut_info->uf_info.ucc_num);
961
962 qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
963 (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
964
965 ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
966
967 /* Enable the TDM port */
968 if (priv->tsa)
969 utdm->si_regs->siglmr1_h |= (0x1 << utdm->tdm_port);
970 }
971
972 napi_enable(&priv->napi);
973 netif_device_attach(priv->ndev);
974
975 return 0;
976}
977
978static const struct dev_pm_ops uhdlc_pm_ops = {
979 .suspend = uhdlc_suspend,
980 .resume = uhdlc_resume,
981 .freeze = uhdlc_suspend,
982 .thaw = uhdlc_resume,
983};
984
985#define HDLC_PM_OPS (&uhdlc_pm_ops)
986
987#else
988
989#define HDLC_PM_OPS NULL
990
991#endif
992static const struct net_device_ops uhdlc_ops = {
993 .ndo_open = uhdlc_open,
994 .ndo_stop = uhdlc_close,
995 .ndo_start_xmit = hdlc_start_xmit,
996 .ndo_do_ioctl = uhdlc_ioctl,
997};
998
999static int ucc_hdlc_probe(struct platform_device *pdev)
1000{
1001 struct device_node *np = pdev->dev.of_node;
1002 struct ucc_hdlc_private *uhdlc_priv = NULL;
1003 struct ucc_tdm_info *ut_info;
1004 struct ucc_tdm *utdm;
1005 struct resource res;
1006 struct net_device *dev;
1007 hdlc_device *hdlc;
1008 int ucc_num;
1009 const char *sprop;
1010 int ret;
1011 u32 val;
1012
1013 ret = of_property_read_u32_index(np, "cell-index", 0, &val);
1014 if (ret) {
1015 dev_err(&pdev->dev, "Invalid ucc property\n");
1016 return -ENODEV;
1017 }
1018
1019 ucc_num = val - 1;
1020 if ((ucc_num > 3) || (ucc_num < 0)) {
1021 dev_err(&pdev->dev, ": Invalid UCC num\n");
1022 return -EINVAL;
1023 }
1024
1025 memcpy(&utdm_info[ucc_num], &utdm_primary_info,
1026 sizeof(utdm_primary_info));
1027
1028 ut_info = &utdm_info[ucc_num];
1029 ut_info->uf_info.ucc_num = ucc_num;
1030
1031 sprop = of_get_property(np, "rx-clock-name", NULL);
1032 if (sprop) {
1033 ut_info->uf_info.rx_clock = qe_clock_source(sprop);
1034 if ((ut_info->uf_info.rx_clock < QE_CLK_NONE) ||
1035 (ut_info->uf_info.rx_clock > QE_CLK24)) {
1036 dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
1037 return -EINVAL;
1038 }
1039 } else {
1040 dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
1041 return -EINVAL;
1042 }
1043
1044 sprop = of_get_property(np, "tx-clock-name", NULL);
1045 if (sprop) {
1046 ut_info->uf_info.tx_clock = qe_clock_source(sprop);
1047 if ((ut_info->uf_info.tx_clock < QE_CLK_NONE) ||
1048 (ut_info->uf_info.tx_clock > QE_CLK24)) {
1049 dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
1050 return -EINVAL;
1051 }
1052 } else {
1053 dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
1054 return -EINVAL;
1055 }
1056
1057 /* use the same clock when work in loopback */
1058 if (ut_info->uf_info.rx_clock == ut_info->uf_info.tx_clock)
1059 qe_setbrg(ut_info->uf_info.rx_clock, 20000000, 1);
1060
1061 ret = of_address_to_resource(np, 0, &res);
1062 if (ret)
1063 return -EINVAL;
1064
1065 ut_info->uf_info.regs = res.start;
1066 ut_info->uf_info.irq = irq_of_parse_and_map(np, 0);
1067
1068 uhdlc_priv = kzalloc(sizeof(*uhdlc_priv), GFP_KERNEL);
1069 if (!uhdlc_priv) {
1070 return -ENOMEM;
1071 }
1072
1073 dev_set_drvdata(&pdev->dev, uhdlc_priv);
1074 uhdlc_priv->dev = &pdev->dev;
1075 uhdlc_priv->ut_info = ut_info;
1076
1077 if (of_get_property(np, "fsl,tdm-interface", NULL))
1078 uhdlc_priv->tsa = 1;
1079
1080 if (of_get_property(np, "fsl,ucc-internal-loopback", NULL))
1081 uhdlc_priv->loopback = 1;
1082
1083 if (uhdlc_priv->tsa == 1) {
1084 utdm = kzalloc(sizeof(*utdm), GFP_KERNEL);
1085 if (!utdm) {
1086 ret = -ENOMEM;
1087 dev_err(&pdev->dev, "No mem to alloc ucc tdm data\n");
1088 goto free_uhdlc_priv;
1089 }
1090 uhdlc_priv->utdm = utdm;
1091 ret = ucc_of_parse_tdm(np, utdm, ut_info);
1092 if (ret)
1093 goto free_utdm;
1094 }
1095
1096 ret = uhdlc_init(uhdlc_priv);
1097 if (ret) {
1098 dev_err(&pdev->dev, "Failed to init uhdlc\n");
1099 goto free_utdm;
1100 }
1101
1102 dev = alloc_hdlcdev(uhdlc_priv);
1103 if (!dev) {
1104 ret = -ENOMEM;
1105 pr_err("ucc_hdlc: unable to allocate memory\n");
1106 goto undo_uhdlc_init;
1107 }
1108
1109 uhdlc_priv->ndev = dev;
1110 hdlc = dev_to_hdlc(dev);
1111 dev->tx_queue_len = 16;
1112 dev->netdev_ops = &uhdlc_ops;
1113 hdlc->attach = ucc_hdlc_attach;
1114 hdlc->xmit = ucc_hdlc_tx;
1115 netif_napi_add(dev, &uhdlc_priv->napi, ucc_hdlc_poll, 32);
1116 if (register_hdlc_device(dev)) {
1117 ret = -ENOBUFS;
1118 pr_err("ucc_hdlc: unable to register hdlc device\n");
1119 free_netdev(dev);
1120 goto free_dev;
1121 }
1122
1123 return 0;
1124
1125free_dev:
1126 free_netdev(dev);
1127undo_uhdlc_init:
1128free_utdm:
1129 if (uhdlc_priv->tsa)
1130 kfree(utdm);
1131free_uhdlc_priv:
1132 kfree(uhdlc_priv);
1133 return ret;
1134}
1135
1136static int ucc_hdlc_remove(struct platform_device *pdev)
1137{
1138 struct ucc_hdlc_private *priv = dev_get_drvdata(&pdev->dev);
1139
1140 uhdlc_memclean(priv);
1141
1142 if (priv->utdm->si_regs) {
1143 iounmap(priv->utdm->si_regs);
1144 priv->utdm->si_regs = NULL;
1145 }
1146
1147 if (priv->utdm->siram) {
1148 iounmap(priv->utdm->siram);
1149 priv->utdm->siram = NULL;
1150 }
1151 kfree(priv);
1152
1153 dev_info(&pdev->dev, "UCC based hdlc module removed\n");
1154
1155 return 0;
1156}
1157
1158static const struct of_device_id fsl_ucc_hdlc_of_match[] = {
1159 {
1160 .compatible = "fsl,ucc-hdlc",
1161 },
1162 {},
1163};
1164
1165MODULE_DEVICE_TABLE(of, fsl_ucc_hdlc_of_match);
1166
1167static struct platform_driver ucc_hdlc_driver = {
1168 .probe = ucc_hdlc_probe,
1169 .remove = ucc_hdlc_remove,
1170 .driver = {
1171 .name = DRV_NAME,
1172 .pm = HDLC_PM_OPS,
1173 .of_match_table = fsl_ucc_hdlc_of_match,
1174 },
1175};
1176
1177module_platform_driver(ucc_hdlc_driver);