drivers/net/wan/fsl_ucc_hdlc.c

   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
  40 static struct ucc_tdm_info utdm_primary_info = {
  41         .uf_info = {
  42                 .tsa = 0,
  43                 .cdp = 0,
  44                 .cds = 1,
  45                 .ctsp = 1,
  46                 .ctss = 1,
  47                 .revd = 0,
  48                 .urfs = 256,
  49                 .utfs = 256,
  50                 .urfet = 128,
  51                 .urfset = 192,
  52                 .utfet = 128,
  53                 .utftt = 0x40,
  54                 .ufpt = 256,
  55                 .mode = UCC_FAST_PROTOCOL_MODE_HDLC,
  56                 .ttx_trx = UCC_FAST_GUMR_TRANSPARENT_TTX_TRX_NORMAL,
  57                 .tenc = UCC_FAST_TX_ENCODING_NRZ,
  58                 .renc = UCC_FAST_RX_ENCODING_NRZ,
  59                 .tcrc = UCC_FAST_16_BIT_CRC,
  60                 .synl = UCC_FAST_SYNC_LEN_NOT_USED,
  61         },
  62
  63         .si_info = {
  64 #ifdef TDM_PPPOHT_SLIC_MAXIN
  65                 .simr_rfsd = 1,
  66                 .simr_tfsd = 2,
  67 #else
  68                 .simr_rfsd = 0,
  69                 .simr_tfsd = 0,
  70 #endif
  71                 .simr_crt = 0,
  72                 .simr_sl = 0,
  73                 .simr_ce = 1,
  74                 .simr_fe = 1,
  75                 .simr_gm = 0,
  76         },
  77 };
  78
  79 static struct ucc_tdm_info utdm_info[MAX_HDLC_NUM];
  80
  81 static int uhdlc_init(struct ucc_hdlc_private *priv)
  82 {
  83         struct ucc_tdm_info *ut_info;
  84         struct ucc_fast_info *uf_info;
  85         u32 cecr_subblock;
  86         u16 bd_status;
  87         int ret, i;
  88         void *bd_buffer;
  89         dma_addr_t bd_dma_addr;
  90         u32 riptr;
  91         u32 tiptr;
  92         u32 gumr;
  93
  94         ut_info = priv->ut_info;
  95         uf_info = &ut_info->uf_info;
  96
  97         if (priv->tsa) {
  98                 uf_info->tsa = 1;
  99                 uf_info->ctsp = 1;
 100         }
 101
 102         /* This sets HPM register in CMXUCR register which configures a
 103          * open drain connected HDLC bus
 104          */
 105         if (priv->hdlc_bus)
 106                 uf_info->brkpt_support = 1;
 107
 108         uf_info->uccm_mask = ((UCC_HDLC_UCCE_RXB | UCC_HDLC_UCCE_RXF |
 109                                 UCC_HDLC_UCCE_TXB) << 16);
 110
 111         ret = ucc_fast_init(uf_info, &priv->uccf);
 112         if (ret) {
 113                 dev_err(priv->dev, "Failed to init uccf.");
 114                 return ret;
 115         }
 116
 117         priv->uf_regs = priv->uccf->uf_regs;
 118         ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
 119
 120         /* Loopback mode */
 121         if (priv->loopback) {
 122                 dev_info(priv->dev, "Loopback Mode\n");
 123                 /* use the same clock when work in loopback */
 124                 qe_setbrg(ut_info->uf_info.rx_clock, 20000000, 1);
 125
 126                 gumr = ioread32be(&priv->uf_regs->gumr);
 127                 gumr |= (UCC_FAST_GUMR_LOOPBACK | UCC_FAST_GUMR_CDS |
 128                          UCC_FAST_GUMR_TCI);
 129                 gumr &= ~(UCC_FAST_GUMR_CTSP | UCC_FAST_GUMR_RSYN);
 130                 iowrite32be(gumr, &priv->uf_regs->gumr);
 131         }
 132
 133         /* Initialize SI */
 134         if (priv->tsa)
 135                 ucc_tdm_init(priv->utdm, priv->ut_info);
 136
 137         /* Write to QE CECR, UCCx channel to Stop Transmission */
 138         cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
 139         ret = qe_issue_cmd(QE_STOP_TX, cecr_subblock,
 140                            QE_CR_PROTOCOL_UNSPECIFIED, 0);
 141
 142         /* Set UPSMR normal mode (need fixed)*/
 143         iowrite32be(0, &priv->uf_regs->upsmr);
 144
 145         /* hdlc_bus mode */
 146         if (priv->hdlc_bus) {
 147                 u32 upsmr;
 148
 149                 dev_info(priv->dev, "HDLC bus Mode\n");
 150                 upsmr = ioread32be(&priv->uf_regs->upsmr);
 151
 152                 /* bus mode and retransmit enable, with collision window
 153                  * set to 8 bytes
 154                  */
 155                 upsmr |= UCC_HDLC_UPSMR_RTE | UCC_HDLC_UPSMR_BUS |
 156                                 UCC_HDLC_UPSMR_CW8;
 157                 iowrite32be(upsmr, &priv->uf_regs->upsmr);
 158
 159                 /* explicitly disable CDS & CTSP */
 160                 gumr = ioread32be(&priv->uf_regs->gumr);
 161                 gumr &= ~(UCC_FAST_GUMR_CDS | UCC_FAST_GUMR_CTSP);
 162                 /* set automatic sync to explicitly ignore CD signal */
 163                 gumr |= UCC_FAST_GUMR_SYNL_AUTO;
 164                 iowrite32be(gumr, &priv->uf_regs->gumr);
 165         }
 166
 167         priv->rx_ring_size = RX_BD_RING_LEN;
 168         priv->tx_ring_size = TX_BD_RING_LEN;
 169         /* Alloc Rx BD */
 170         priv->rx_bd_base = dma_alloc_coherent(priv->dev,
 171                         RX_BD_RING_LEN * sizeof(struct qe_bd),
 172                         &priv->dma_rx_bd, GFP_KERNEL);
 173
 174         if (!priv->rx_bd_base) {
 175                 dev_err(priv->dev, "Cannot allocate MURAM memory for RxBDs\n");
 176                 ret = -ENOMEM;
 177                 goto free_uccf;
 178         }
 179
 180         /* Alloc Tx BD */
 181         priv->tx_bd_base = dma_alloc_coherent(priv->dev,
 182                         TX_BD_RING_LEN * sizeof(struct qe_bd),
 183                         &priv->dma_tx_bd, GFP_KERNEL);
 184
 185         if (!priv->tx_bd_base) {
 186                 dev_err(priv->dev, "Cannot allocate MURAM memory for TxBDs\n");
 187                 ret = -ENOMEM;
 188                 goto free_rx_bd;
 189         }
 190
 191         /* Alloc parameter ram for ucc hdlc */
 192         priv->ucc_pram_offset = qe_muram_alloc(sizeof(struct ucc_hdlc_param),
 193                                 ALIGNMENT_OF_UCC_HDLC_PRAM);
 194
 195         if (priv->ucc_pram_offset < 0) {
 196                 dev_err(priv->dev, "Can not allocate MURAM for hdlc parameter.\n");
 197                 ret = -ENOMEM;
 198                 goto free_tx_bd;
 199         }
 200
 201         priv->rx_skbuff = kzalloc(priv->rx_ring_size * sizeof(*priv->rx_skbuff),
 202                                   GFP_KERNEL);
 203         if (!priv->rx_skbuff)
 204                 goto free_ucc_pram;
 205
 206         priv->tx_skbuff = kzalloc(priv->tx_ring_size * sizeof(*priv->tx_skbuff),
 207                                   GFP_KERNEL);
 208         if (!priv->tx_skbuff)
 209                 goto free_rx_skbuff;
 210
 211         priv->skb_curtx = 0;
 212         priv->skb_dirtytx = 0;
 213         priv->curtx_bd = priv->tx_bd_base;
 214         priv->dirty_tx = priv->tx_bd_base;
 215         priv->currx_bd = priv->rx_bd_base;
 216         priv->currx_bdnum = 0;
 217
 218         /* init parameter base */
 219         cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
 220         ret = qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
 221                            QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);
 222
 223         priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
 224                                         qe_muram_addr(priv->ucc_pram_offset);
 225
 226         /* Zero out parameter ram */
 227         memset_io(priv->ucc_pram, 0, sizeof(struct ucc_hdlc_param));
 228
 229         /* Alloc riptr, tiptr */
 230         riptr = qe_muram_alloc(32, 32);
 231         if (riptr < 0) {
 232                 dev_err(priv->dev, "Cannot allocate MURAM mem for Receive internal temp data pointer\n");
 233                 ret = -ENOMEM;
 234                 goto free_tx_skbuff;
 235         }
 236
 237         tiptr = qe_muram_alloc(32, 32);
 238         if (tiptr < 0) {
 239                 dev_err(priv->dev, "Cannot allocate MURAM mem for Transmit internal temp data pointer\n");
 240                 ret = -ENOMEM;
 241                 goto free_riptr;
 242         }
 243
 244         /* Set RIPTR, TIPTR */
 245         iowrite16be(riptr, &priv->ucc_pram->riptr);
 246         iowrite16be(tiptr, &priv->ucc_pram->tiptr);
 247
 248         /* Set MRBLR */
 249         iowrite16be(MAX_RX_BUF_LENGTH, &priv->ucc_pram->mrblr);
 250
 251         /* Set RBASE, TBASE */
 252         iowrite32be(priv->dma_rx_bd, &priv->ucc_pram->rbase);
 253         iowrite32be(priv->dma_tx_bd, &priv->ucc_pram->tbase);
 254
 255         /* Set RSTATE, TSTATE */
 256         iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->rstate);
 257         iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->tstate);
 258
 259         /* Set C_MASK, C_PRES for 16bit CRC */
 260         iowrite32be(CRC_16BIT_MASK, &priv->ucc_pram->c_mask);
 261         iowrite32be(CRC_16BIT_PRES, &priv->ucc_pram->c_pres);
 262
 263         iowrite16be(MAX_FRAME_LENGTH, &priv->ucc_pram->mflr);
 264         iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfthr);
 265         iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfcnt);
 266         iowrite16be(DEFAULT_ADDR_MASK, &priv->ucc_pram->hmask);
 267         iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr1);
 268         iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr2);
 269         iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr3);
 270         iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr4);
 271
 272         /* Get BD buffer */
 273         bd_buffer = dma_alloc_coherent(priv->dev,
 274                                        (RX_BD_RING_LEN + TX_BD_RING_LEN) *
 275                                        MAX_RX_BUF_LENGTH,
 276                                        &bd_dma_addr, GFP_KERNEL);
 277
 278         if (!bd_buffer) {
 279                 dev_err(priv->dev, "Could not allocate buffer descriptors\n");
 280                 ret = -ENOMEM;
 281                 goto free_tiptr;
 282         }
 283
 284         memset(bd_buffer, 0, (RX_BD_RING_LEN + TX_BD_RING_LEN)
 285                         * MAX_RX_BUF_LENGTH);
 286
 287         priv->rx_buffer = bd_buffer;
 288         priv->tx_buffer = bd_buffer + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;
 289
 290         priv->dma_rx_addr = bd_dma_addr;
 291         priv->dma_tx_addr = bd_dma_addr + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;
 292
 293         for (i = 0; i < RX_BD_RING_LEN; i++) {
 294                 if (i < (RX_BD_RING_LEN - 1))
 295                         bd_status = R_E_S | R_I_S;
 296                 else
 297                         bd_status = R_E_S | R_I_S | R_W_S;
 298
 299                 iowrite16be(bd_status, &priv->rx_bd_base[i].status);
 300                 iowrite32be(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH,
 301                             &priv->rx_bd_base[i].buf);
 302         }
 303
 304         for (i = 0; i < TX_BD_RING_LEN; i++) {
 305                 if (i < (TX_BD_RING_LEN - 1))
 306                         bd_status =  T_I_S | T_TC_S;
 307                 else
 308                         bd_status =  T_I_S | T_TC_S | T_W_S;
 309
 310                 iowrite16be(bd_status, &priv->tx_bd_base[i].status);
 311                 iowrite32be(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH,
 312                             &priv->tx_bd_base[i].buf);
 313         }
 314
 315         return 0;
 316
 317 free_tiptr:
 318         qe_muram_free(tiptr);
 319 free_riptr:
 320         qe_muram_free(riptr);
 321 free_tx_skbuff:
 322         kfree(priv->tx_skbuff);
 323 free_rx_skbuff:
 324         kfree(priv->rx_skbuff);
 325 free_ucc_pram:
 326         qe_muram_free(priv->ucc_pram_offset);
 327 free_tx_bd:
 328         dma_free_coherent(priv->dev,
 329                           TX_BD_RING_LEN * sizeof(struct qe_bd),
 330                           priv->tx_bd_base, priv->dma_tx_bd);
 331 free_rx_bd:
 332         dma_free_coherent(priv->dev,
 333                           RX_BD_RING_LEN * sizeof(struct qe_bd),
 334                           priv->rx_bd_base, priv->dma_rx_bd);
 335 free_uccf:
 336         ucc_fast_free(priv->uccf);
 337
 338         return ret;
 339 }
 340
 341 static netdev_tx_t ucc_hdlc_tx(struct sk_buff *skb, struct net_device *dev)
 342 {
 343         hdlc_device *hdlc = dev_to_hdlc(dev);
 344         struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)hdlc->priv;
 345         struct qe_bd __iomem *bd;
 346         u16 bd_status;
 347         unsigned long flags;
 348         u16 *proto_head;
 349
 350         switch (dev->type) {
 351         case ARPHRD_RAWHDLC:
 352                 if (skb_headroom(skb) < HDLC_HEAD_LEN) {
 353                         dev->stats.tx_dropped++;
 354                         dev_kfree_skb(skb);
 355                         netdev_err(dev, "No enough space for hdlc head\n");
 356                         return -ENOMEM;
 357                 }
 358
 359                 skb_push(skb, HDLC_HEAD_LEN);
 360
 361                 proto_head = (u16 *)skb->data;
 362                 *proto_head = htons(DEFAULT_HDLC_HEAD);
 363
 364                 dev->stats.tx_bytes += skb->len;
 365                 break;
 366
 367         case ARPHRD_PPP:
 368                 proto_head = (u16 *)skb->data;
 369                 if (*proto_head != htons(DEFAULT_PPP_HEAD)) {
 370                         dev->stats.tx_dropped++;
 371                         dev_kfree_skb(skb);
 372                         netdev_err(dev, "Wrong ppp header\n");
 373                         return -ENOMEM;
 374                 }
 375
 376                 dev->stats.tx_bytes += skb->len;
 377                 break;
 378
 379         default:
 380                 dev->stats.tx_dropped++;
 381                 dev_kfree_skb(skb);
 382                 return -ENOMEM;
 383         }
 384         spin_lock_irqsave(&priv->lock, flags);
 385
 386         /* Start from the next BD that should be filled */
 387         bd = priv->curtx_bd;
 388         bd_status = ioread16be(&bd->status);
 389         /* Save the skb pointer so we can free it later */
 390         priv->tx_skbuff[priv->skb_curtx] = skb;
 391
 392         /* Update the current skb pointer (wrapping if this was the last) */
 393         priv->skb_curtx =
 394             (priv->skb_curtx + 1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);
 395
 396         /* copy skb data to tx buffer for sdma processing */
 397         memcpy(priv->tx_buffer + (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
 398                skb->data, skb->len);
 399
 400         /* set bd status and length */
 401         bd_status = (bd_status & T_W_S) | T_R_S | T_I_S | T_L_S | T_TC_S;
 402
 403         iowrite16be(skb->len, &bd->length);
 404         iowrite16be(bd_status, &bd->status);
 405
 406         /* Move to next BD in the ring */
 407         if (!(bd_status & T_W_S))
 408                 bd += 1;
 409         else
 410                 bd = priv->tx_bd_base;
 411
 412         if (bd == priv->dirty_tx) {
 413                 if (!netif_queue_stopped(dev))
 414                         netif_stop_queue(dev);
 415         }
 416
 417         priv->curtx_bd = bd;
 418
 419         spin_unlock_irqrestore(&priv->lock, flags);
 420
 421         return NETDEV_TX_OK;
 422 }
 423
 424 static int hdlc_tx_done(struct ucc_hdlc_private *priv)
 425 {
 426         /* Start from the next BD that should be filled */
 427         struct net_device *dev = priv->ndev;
 428         struct qe_bd *bd;               /* BD pointer */
 429         u16 bd_status;
 430
 431         bd = priv->dirty_tx;
 432         bd_status = ioread16be(&bd->status);
 433
 434         /* Normal processing. */
 435         while ((bd_status & T_R_S) == 0) {
 436                 struct sk_buff *skb;
 437
 438                 /* BD contains already transmitted buffer.   */
 439                 /* Handle the transmitted buffer and release */
 440                 /* the BD to be used with the current frame  */
 441
 442                 skb = priv->tx_skbuff[priv->skb_dirtytx];
 443                 if (!skb)
 444                         break;
 445                 dev->stats.tx_packets++;
 446                 memset(priv->tx_buffer +
 447                        (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
 448                        0, skb->len);
 449                 dev_kfree_skb_irq(skb);
 450
 451                 priv->tx_skbuff[priv->skb_dirtytx] = NULL;
 452                 priv->skb_dirtytx =
 453                     (priv->skb_dirtytx +
 454                      1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);
 455
 456                 /* We freed a buffer, so now we can restart transmission */
 457                 if (netif_queue_stopped(dev))
 458                         netif_wake_queue(dev);
 459
 460                 /* Advance the confirmation BD pointer */
 461                 if (!(bd_status & T_W_S))
 462                         bd += 1;
 463                 else
 464                         bd = priv->tx_bd_base;
 465                 bd_status = ioread16be(&bd->status);
 466         }
 467         priv->dirty_tx = bd;
 468
 469         return 0;
 470 }
 471
 472 static int hdlc_rx_done(struct ucc_hdlc_private *priv, int rx_work_limit)
 473 {
 474         struct net_device *dev = priv->ndev;
 475         struct sk_buff *skb = NULL;
 476         hdlc_device *hdlc = dev_to_hdlc(dev);
 477         struct qe_bd *bd;
 478         u16 bd_status;
 479         u16 length, howmany = 0;
 480         u8 *bdbuffer;
 481
 482         bd = priv->currx_bd;
 483         bd_status = ioread16be(&bd->status);
 484
 485         /* while there are received buffers and BD is full (~R_E) */
 486         while (!((bd_status & (R_E_S)) || (--rx_work_limit < 0))) {
 487                 if (bd_status & R_OV_S)
 488                         dev->stats.rx_over_errors++;
 489                 if (bd_status & R_CR_S) {
 490                         dev->stats.rx_crc_errors++;
 491                         dev->stats.rx_dropped++;
 492                         goto recycle;
 493                 }
 494                 bdbuffer = priv->rx_buffer +
 495                         (priv->currx_bdnum * MAX_RX_BUF_LENGTH);
 496                 length = ioread16be(&bd->length);
 497
 498                 switch (dev->type) {
 499                 case ARPHRD_RAWHDLC:
 500                         bdbuffer += HDLC_HEAD_LEN;
 501                         length -= (HDLC_HEAD_LEN + HDLC_CRC_SIZE);
 502
 503                         skb = dev_alloc_skb(length);
 504                         if (!skb) {
 505                                 dev->stats.rx_dropped++;
 506                                 return -ENOMEM;
 507                         }
 508
 509                         skb_put(skb, length);
 510                         skb->len = length;
 511                         skb->dev = dev;
 512                         memcpy(skb->data, bdbuffer, length);
 513                         break;
 514
 515                 case ARPHRD_PPP:
 516                         length -= HDLC_CRC_SIZE;
 517
 518                         skb = dev_alloc_skb(length);
 519                         if (!skb) {
 520                                 dev->stats.rx_dropped++;
 521                                 return -ENOMEM;
 522                         }
 523
 524                         skb_put(skb, length);
 525                         skb->len = length;
 526                         skb->dev = dev;
 527                         memcpy(skb->data, bdbuffer, length);
 528                         break;
 529                 }
 530
 531                 dev->stats.rx_packets++;
 532                 dev->stats.rx_bytes += skb->len;
 533                 howmany++;
 534                 if (hdlc->proto)
 535                         skb->protocol = hdlc_type_trans(skb, dev);
 536                 netif_receive_skb(skb);
 537
 538 recycle:
 539                 iowrite16be(bd_status | R_E_S | R_I_S, &bd->status);
 540
 541                 /* update to point at the next bd */
 542                 if (bd_status & R_W_S) {
 543                         priv->currx_bdnum = 0;
 544                         bd = priv->rx_bd_base;
 545                 } else {
 546                         if (priv->currx_bdnum < (RX_BD_RING_LEN - 1))
 547                                 priv->currx_bdnum += 1;
 548                         else
 549                                 priv->currx_bdnum = RX_BD_RING_LEN - 1;
 550
 551                         bd += 1;
 552                 }
 553
 554                 bd_status = ioread16be(&bd->status);
 555         }
 556
 557         priv->currx_bd = bd;
 558         return howmany;
 559 }
 560
 561 static int ucc_hdlc_poll(struct napi_struct *napi, int budget)
 562 {
 563         struct ucc_hdlc_private *priv = container_of(napi,
 564                                                      struct ucc_hdlc_private,
 565                                                      napi);
 566         int howmany;
 567
 568         /* Tx event processing */
 569         spin_lock(&priv->lock);
 570         hdlc_tx_done(priv);
 571         spin_unlock(&priv->lock);
 572
 573         howmany = 0;
 574         howmany += hdlc_rx_done(priv, budget - howmany);
 575
 576         if (howmany < budget) {
 577                 napi_complete_done(napi, howmany);
 578                 qe_setbits32(priv->uccf->p_uccm,
 579                              (UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS) << 16);
 580         }
 581
 582         return howmany;
 583 }
 584
 585 static irqreturn_t ucc_hdlc_irq_handler(int irq, void *dev_id)
 586 {
 587         struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)dev_id;
 588         struct net_device *dev = priv->ndev;
 589         struct ucc_fast_private *uccf;
 590         struct ucc_tdm_info *ut_info;
 591         u32 ucce;
 592         u32 uccm;
 593
 594         ut_info = priv->ut_info;
 595         uccf = priv->uccf;
 596
 597         ucce = ioread32be(uccf->p_ucce);
 598         uccm = ioread32be(uccf->p_uccm);
 599         ucce &= uccm;
 600         iowrite32be(ucce, uccf->p_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
 622 static 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
 650 static 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
 684 static 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
 746 static 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
 773 static 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
 794 static 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
 809 static 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
 821 static 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         return 0;
 859 }
 860
 861 static int uhdlc_resume(struct device *dev)
 862 {
 863         struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
 864         struct ucc_tdm *utdm;
 865         struct ucc_tdm_info *ut_info;
 866         struct ucc_fast __iomem *uf_regs;
 867         struct ucc_fast_private *uccf;
 868         struct ucc_fast_info *uf_info;
 869         int ret, i;
 870         u32 cecr_subblock;
 871         u16 bd_status;
 872
 873         if (!priv)
 874                 return -EINVAL;
 875
 876         if (!netif_running(priv->ndev))
 877                 return 0;
 878
 879         utdm = priv->utdm;
 880         ut_info = priv->ut_info;
 881         uf_info = &ut_info->uf_info;
 882         uf_regs = priv->uf_regs;
 883         uccf = priv->uccf;
 884
 885         /* restore gumr guemr */
 886         iowrite8(priv->guemr, &uf_regs->guemr);
 887         iowrite32be(priv->gumr, &uf_regs->gumr);
 888
 889         /* Set Virtual Fifo registers */
 890         iowrite16be(uf_info->urfs, &uf_regs->urfs);
 891         iowrite16be(uf_info->urfet, &uf_regs->urfet);
 892         iowrite16be(uf_info->urfset, &uf_regs->urfset);
 893         iowrite16be(uf_info->utfs, &uf_regs->utfs);
 894         iowrite16be(uf_info->utfet, &uf_regs->utfet);
 895         iowrite16be(uf_info->utftt, &uf_regs->utftt);
 896         /* utfb, urfb are offsets from MURAM base */
 897         iowrite32be(uccf->ucc_fast_tx_virtual_fifo_base_offset, &uf_regs->utfb);
 898         iowrite32be(uccf->ucc_fast_rx_virtual_fifo_base_offset, &uf_regs->urfb);
 899
 900         /* Rx Tx and sync clock routing */
 901         resume_clk_config(priv);
 902
 903         iowrite32be(uf_info->uccm_mask, &uf_regs->uccm);
 904         iowrite32be(0xffffffff, &uf_regs->ucce);
 905
 906         ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
 907
 908         /* rebuild SIRAM */
 909         if (priv->tsa)
 910                 ucc_tdm_init(priv->utdm, priv->ut_info);
 911
 912         /* Write to QE CECR, UCCx channel to Stop Transmission */
 913         cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
 914         ret = qe_issue_cmd(QE_STOP_TX, cecr_subblock,
 915                            (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
 916
 917         /* Set UPSMR normal mode */
 918         iowrite32be(0, &uf_regs->upsmr);
 919
 920         /* init parameter base */
 921         cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
 922         ret = qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
 923                            QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);
 924
 925         priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
 926                                 qe_muram_addr(priv->ucc_pram_offset);
 927
 928         /* restore ucc parameter */
 929         memcpy_toio(priv->ucc_pram, priv->ucc_pram_bak,
 930                     sizeof(struct ucc_hdlc_param));
 931         kfree(priv->ucc_pram_bak);
 932
 933         /* rebuild BD entry */
 934         for (i = 0; i < RX_BD_RING_LEN; i++) {
 935                 if (i < (RX_BD_RING_LEN - 1))
 936                         bd_status = R_E_S | R_I_S;
 937                 else
 938                         bd_status = R_E_S | R_I_S | R_W_S;
 939
 940                 iowrite16be(bd_status, &priv->rx_bd_base[i].status);
 941                 iowrite32be(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH,
 942                             &priv->rx_bd_base[i].buf);
 943         }
 944
 945         for (i = 0; i < TX_BD_RING_LEN; i++) {
 946                 if (i < (TX_BD_RING_LEN - 1))
 947                         bd_status =  T_I_S | T_TC_S;
 948                 else
 949                         bd_status =  T_I_S | T_TC_S | T_W_S;
 950
 951                 iowrite16be(bd_status, &priv->tx_bd_base[i].status);
 952                 iowrite32be(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH,
 953                             &priv->tx_bd_base[i].buf);
 954         }
 955
 956         /* if hdlc is busy enable TX and RX */
 957         if (priv->hdlc_busy == 1) {
 958                 cecr_subblock = ucc_fast_get_qe_cr_subblock(
 959                                         priv->ut_info->uf_info.ucc_num);
 960
 961                 qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
 962                              (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
 963
 964                 ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
 965
 966                 /* Enable the TDM port */
 967                 if (priv->tsa)
 968                         utdm->si_regs->siglmr1_h |= (0x1 << utdm->tdm_port);
 969         }
 970
 971         napi_enable(&priv->napi);
 972         netif_device_attach(priv->ndev);
 973
 974         return 0;
 975 }
 976
 977 static const struct dev_pm_ops uhdlc_pm_ops = {
 978         .suspend = uhdlc_suspend,
 979         .resume = uhdlc_resume,
 980         .freeze = uhdlc_suspend,
 981         .thaw = uhdlc_resume,
 982 };
 983
 984 #define HDLC_PM_OPS (&uhdlc_pm_ops)
 985
 986 #else
 987
 988 #define HDLC_PM_OPS NULL
 989
 990 #endif
 991 static const struct net_device_ops uhdlc_ops = {
 992         .ndo_open       = uhdlc_open,
 993         .ndo_stop       = uhdlc_close,
 994         .ndo_start_xmit = hdlc_start_xmit,
 995         .ndo_do_ioctl   = uhdlc_ioctl,
 996 };
 997
 998 static int ucc_hdlc_probe(struct platform_device *pdev)
 999 {
1000         struct device_node *np = pdev->dev.of_node;
1001         struct ucc_hdlc_private *uhdlc_priv = NULL;
1002         struct ucc_tdm_info *ut_info;
1003         struct ucc_tdm *utdm = NULL;
1004         struct resource res;
1005         struct net_device *dev;
1006         hdlc_device *hdlc;
1007         int ucc_num;
1008         const char *sprop;
1009         int ret;
1010         u32 val;
1011
1012         ret = of_property_read_u32_index(np, "cell-index", 0, &val);
1013         if (ret) {
1014                 dev_err(&pdev->dev, "Invalid ucc property\n");
1015                 return -ENODEV;
1016         }
1017
1018         ucc_num = val - 1;
1019         if ((ucc_num > 3) || (ucc_num < 0)) {
1020                 dev_err(&pdev->dev, ": Invalid UCC num\n");
1021                 return -EINVAL;
1022         }
1023
1024         memcpy(&utdm_info[ucc_num], &utdm_primary_info,
1025                sizeof(utdm_primary_info));
1026
1027         ut_info = &utdm_info[ucc_num];
1028         ut_info->uf_info.ucc_num = ucc_num;
1029
1030         sprop = of_get_property(np, "rx-clock-name", NULL);
1031         if (sprop) {
1032                 ut_info->uf_info.rx_clock = qe_clock_source(sprop);
1033                 if ((ut_info->uf_info.rx_clock < QE_CLK_NONE) ||
1034                     (ut_info->uf_info.rx_clock > QE_CLK24)) {
1035                         dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
1036                         return -EINVAL;
1037                 }
1038         } else {
1039                 dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
1040                 return -EINVAL;
1041         }
1042
1043         sprop = of_get_property(np, "tx-clock-name", NULL);
1044         if (sprop) {
1045                 ut_info->uf_info.tx_clock = qe_clock_source(sprop);
1046                 if ((ut_info->uf_info.tx_clock < QE_CLK_NONE) ||
1047                     (ut_info->uf_info.tx_clock > QE_CLK24)) {
1048                         dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
1049                         return -EINVAL;
1050                 }
1051         } else {
1052                 dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
1053                 return -EINVAL;
1054         }
1055
1056         ret = of_address_to_resource(np, 0, &res);
1057         if (ret)
1058                 return -EINVAL;
1059
1060         ut_info->uf_info.regs = res.start;
1061         ut_info->uf_info.irq = irq_of_parse_and_map(np, 0);
1062
1063         uhdlc_priv = kzalloc(sizeof(*uhdlc_priv), GFP_KERNEL);
1064         if (!uhdlc_priv) {
1065                 return -ENOMEM;
1066         }
1067
1068         dev_set_drvdata(&pdev->dev, uhdlc_priv);
1069         uhdlc_priv->dev = &pdev->dev;
1070         uhdlc_priv->ut_info = ut_info;
1071
1072         if (of_get_property(np, "fsl,tdm-interface", NULL))
1073                 uhdlc_priv->tsa = 1;
1074
1075         if (of_get_property(np, "fsl,ucc-internal-loopback", NULL))
1076                 uhdlc_priv->loopback = 1;
1077
1078         if (of_get_property(np, "fsl,hdlc-bus", NULL))
1079                 uhdlc_priv->hdlc_bus = 1;
1080
1081         if (uhdlc_priv->tsa == 1) {
1082                 utdm = kzalloc(sizeof(*utdm), GFP_KERNEL);
1083                 if (!utdm) {
1084                         ret = -ENOMEM;
1085                         dev_err(&pdev->dev, "No mem to alloc ucc tdm data\n");
1086                         goto free_uhdlc_priv;
1087                 }
1088                 uhdlc_priv->utdm = utdm;
1089                 ret = ucc_of_parse_tdm(np, utdm, ut_info);
1090                 if (ret)
1091                         goto free_utdm;
1092         }
1093
1094         ret = uhdlc_init(uhdlc_priv);
1095         if (ret) {
1096                 dev_err(&pdev->dev, "Failed to init uhdlc\n");
1097                 goto free_utdm;
1098         }
1099
1100         dev = alloc_hdlcdev(uhdlc_priv);
1101         if (!dev) {
1102                 ret = -ENOMEM;
1103                 pr_err("ucc_hdlc: unable to allocate memory\n");
1104                 goto undo_uhdlc_init;
1105         }
1106
1107         uhdlc_priv->ndev = dev;
1108         hdlc = dev_to_hdlc(dev);
1109         dev->tx_queue_len = 16;
1110         dev->netdev_ops = &uhdlc_ops;
1111         hdlc->attach = ucc_hdlc_attach;
1112         hdlc->xmit = ucc_hdlc_tx;
1113         netif_napi_add(dev, &uhdlc_priv->napi, ucc_hdlc_poll, 32);
1114         if (register_hdlc_device(dev)) {
1115                 ret = -ENOBUFS;
1116                 pr_err("ucc_hdlc: unable to register hdlc device\n");
1117                 free_netdev(dev);
1118                 goto free_dev;
1119         }
1120
1121         return 0;
1122
1123 free_dev:
1124         free_netdev(dev);
1125 undo_uhdlc_init:
1126 free_utdm:
1127         if (uhdlc_priv->tsa)
1128                 kfree(utdm);
1129 free_uhdlc_priv:
1130         kfree(uhdlc_priv);
1131         return ret;
1132 }
1133
1134 static int ucc_hdlc_remove(struct platform_device *pdev)
1135 {
1136         struct ucc_hdlc_private *priv = dev_get_drvdata(&pdev->dev);
1137
1138         uhdlc_memclean(priv);
1139
1140         if (priv->utdm->si_regs) {
1141                 iounmap(priv->utdm->si_regs);
1142                 priv->utdm->si_regs = NULL;
1143         }
1144
1145         if (priv->utdm->siram) {
1146                 iounmap(priv->utdm->siram);
1147                 priv->utdm->siram = NULL;
1148         }
1149         kfree(priv);
1150
1151         dev_info(&pdev->dev, "UCC based hdlc module removed\n");
1152
1153         return 0;
1154 }
1155
1156 static const struct of_device_id fsl_ucc_hdlc_of_match[] = {
1157         {
1158         .compatible = "fsl,ucc-hdlc",
1159         },
1160         {},
1161 };
1162
1163 MODULE_DEVICE_TABLE(of, fsl_ucc_hdlc_of_match);
1164
1165 static struct platform_driver ucc_hdlc_driver = {
1166         .probe  = ucc_hdlc_probe,
1167         .remove = ucc_hdlc_remove,
1168         .driver = {
1169                 .name           = DRV_NAME,
1170                 .pm             = HDLC_PM_OPS,
1171                 .of_match_table = fsl_ucc_hdlc_of_match,
1172         },
1173 };
1174
1175 module_platform_driver(ucc_hdlc_driver);
1176 MODULE_LICENSE("GPL");