drivers/net/wan/fsl_ucc_hdlc.c

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