drivers/staging/sbe-2t3e3/dc.c

   1 /*
   2  * SBE 2T3E3 synchronous serial card driver for Linux
   3  *
   4  * Copyright (C) 2009-2010 Krzysztof Halasa <khc@pm.waw.pl>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License
   8  * as published by the Free Software Foundation.
   9  *
  10  * This code is based on a driver written by SBE Inc.
  11  */
  12
  13 #include <linux/netdevice.h>
  14 #include <linux/types.h>
  15 #include <linux/errno.h>
  16 #include <linux/io.h>
  17 #include "2t3e3.h"
  18 #include "ctrl.h"
  19
  20 static int dc_init_descriptor_list(struct channel *sc);
  21
  22 void dc_init(struct channel *sc)
  23 {
  24         u32 val;
  25
  26         dc_stop(sc);
  27         /*dc_reset(sc);*/ /* do not want to reset here */
  28
  29         /*
  30          * BUS_MODE (CSR0)
  31          */
  32         val = SBE_2T3E3_21143_VAL_READ_LINE_ENABLE |
  33                 SBE_2T3E3_21143_VAL_READ_MULTIPLE_ENABLE |
  34                 SBE_2T3E3_21143_VAL_TRANSMIT_AUTOMATIC_POLLING_200us |
  35                 SBE_2T3E3_21143_VAL_BUS_ARBITRATION_RR;
  36
  37         if (sc->h.command & 16)
  38                 val |= SBE_2T3E3_21143_VAL_WRITE_AND_INVALIDATE_ENABLE;
  39
  40         switch (sc->h.cache_size) {
  41         case 32:
  42                 val |= SBE_2T3E3_21143_VAL_CACHE_ALIGNMENT_32;
  43                 break;
  44         case 16:
  45                 val |= SBE_2T3E3_21143_VAL_CACHE_ALIGNMENT_16;
  46                 break;
  47         case 8:
  48                 val |= SBE_2T3E3_21143_VAL_CACHE_ALIGNMENT_8;
  49                 break;
  50         default:
  51                 break;
  52         }
  53
  54         dc_write(sc->addr, SBE_2T3E3_21143_REG_BUS_MODE, val);
  55
  56         /* OPERATION_MODE (CSR6) */
  57         val = SBE_2T3E3_21143_VAL_RECEIVE_ALL |
  58                 SBE_2T3E3_21143_VAL_MUST_BE_ONE |
  59                 SBE_2T3E3_21143_VAL_THRESHOLD_CONTROL_BITS_1 |
  60                 SBE_2T3E3_21143_VAL_LOOPBACK_OFF |
  61                 SBE_2T3E3_21143_VAL_PASS_ALL_MULTICAST |
  62                 SBE_2T3E3_21143_VAL_PROMISCUOUS_MODE |
  63                 SBE_2T3E3_21143_VAL_PASS_BAD_FRAMES;
  64         dc_write(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE, val);
  65         if (sc->p.loopback == SBE_2T3E3_LOOPBACK_ETHERNET)
  66                 sc->p.loopback = SBE_2T3E3_LOOPBACK_NONE;
  67
  68         /*
  69          * GENERAL_PURPOSE_TIMER_AND_INTERRUPT_MITIGATION_CONTROL (CSR11)
  70          */
  71         val = SBE_2T3E3_21143_VAL_CYCLE_SIZE |
  72                 SBE_2T3E3_21143_VAL_TRANSMIT_TIMER |
  73                 SBE_2T3E3_21143_VAL_NUMBER_OF_TRANSMIT_PACKETS |
  74                 SBE_2T3E3_21143_VAL_RECEIVE_TIMER |
  75                 SBE_2T3E3_21143_VAL_NUMBER_OF_RECEIVE_PACKETS;
  76         dc_write(sc->addr, SBE_2T3E3_21143_REG_GENERAL_PURPOSE_TIMER_AND_INTERRUPT_MITIGATION_CONTROL, val);
  77
  78         /* prepare descriptors and data for receive and transmit processes */
  79         if (dc_init_descriptor_list(sc) != 0)
  80                 return;
  81
  82         /* clear ethernet interrupts status */
  83         dc_write(sc->addr, SBE_2T3E3_21143_REG_STATUS, 0xFFFFFFFF);
  84
  85         /* SIA mode registers */
  86         dc_set_output_port(sc);
  87 }
  88
  89 void dc_start(struct channel *sc)
  90 {
  91         u32 val;
  92
  93         if (!(sc->r.flags & SBE_2T3E3_FLAG_NETWORK_UP))
  94                 return;
  95
  96         dc_init(sc);
  97
  98         /* get actual LOS and OOF status */
  99         switch (sc->p.frame_type) {
 100         case SBE_2T3E3_FRAME_TYPE_E3_G751:
 101         case SBE_2T3E3_FRAME_TYPE_E3_G832:
 102                 val = exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_CONFIGURATION_STATUS_2);
 103                 dev_dbg(&sc->pdev->dev, "Start Framer Rx Status = %02X\n", val);
 104                 sc->s.OOF = val & SBE_2T3E3_FRAMER_VAL_E3_RX_OOF ? 1 : 0;
 105                 break;
 106         case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
 107         case SBE_2T3E3_FRAME_TYPE_T3_M13:
 108                 val = exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_CONFIGURATION_STATUS);
 109                 dev_dbg(&sc->pdev->dev, "Start Framer Rx Status = %02X\n", val);
 110                 sc->s.OOF = val & SBE_2T3E3_FRAMER_VAL_T3_RX_OOF ? 1 : 0;
 111                 break;
 112         default:
 113                 break;
 114         }
 115         cpld_LOS_update(sc);
 116
 117         /* start receive and transmit processes */
 118         dc_transmitter_onoff(sc, SBE_2T3E3_ON);
 119         dc_receiver_onoff(sc, SBE_2T3E3_ON);
 120
 121         /* start interrupts */
 122         dc_start_intr(sc);
 123 }
 124
 125 #define MAX_INT_WAIT_CNT        12000
 126 void dc_stop(struct channel *sc)
 127 {
 128         int wcnt;
 129
 130         /* stop receive and transmit processes */
 131         dc_receiver_onoff(sc, SBE_2T3E3_OFF);
 132         dc_transmitter_onoff(sc, SBE_2T3E3_OFF);
 133
 134         /* turn off ethernet interrupts */
 135         dc_stop_intr(sc);
 136
 137         /* wait to ensure the interrupts have been completed */
 138         for (wcnt = 0; wcnt < MAX_INT_WAIT_CNT; wcnt++) {
 139                 udelay(5);
 140                 if (!sc->interrupt_active)
 141                         break;
 142         }
 143         if (wcnt >= MAX_INT_WAIT_CNT)
 144                 dev_warn(&sc->pdev->dev, "SBE 2T3E3: Interrupt active too long\n");
 145
 146         /* clear all receive/transmit data */
 147         dc_drop_descriptor_list(sc);
 148 }
 149
 150 void dc_start_intr(struct channel *sc)
 151 {
 152         if (sc->p.loopback == SBE_2T3E3_LOOPBACK_NONE && sc->s.OOF)
 153                 return;
 154
 155         if (sc->p.receiver_on || sc->p.transmitter_on) {
 156                 if (!sc->ether.interrupt_enable_mask)
 157                         dc_write(sc->addr, SBE_2T3E3_21143_REG_STATUS, 0xFFFFFFFF);
 158
 159                 sc->ether.interrupt_enable_mask =
 160                         SBE_2T3E3_21143_VAL_NORMAL_INTERRUPT_SUMMARY_ENABLE |
 161                         SBE_2T3E3_21143_VAL_ABNORMAL_INTERRUPT_SUMMARY_ENABLE |
 162                         SBE_2T3E3_21143_VAL_RECEIVE_STOPPED_ENABLE |
 163                         SBE_2T3E3_21143_VAL_RECEIVE_BUFFER_UNAVAILABLE_ENABLE |
 164                         SBE_2T3E3_21143_VAL_RECEIVE_INTERRUPT_ENABLE |
 165                         SBE_2T3E3_21143_VAL_TRANSMIT_UNDERFLOW_INTERRUPT_ENABLE |
 166                         SBE_2T3E3_21143_VAL_TRANSMIT_BUFFER_UNAVAILABLE_ENABLE |
 167                         SBE_2T3E3_21143_VAL_TRANSMIT_STOPPED_ENABLE |
 168                         SBE_2T3E3_21143_VAL_TRANSMIT_INTERRUPT_ENABLE;
 169
 170                 dc_write(sc->addr, SBE_2T3E3_21143_REG_INTERRUPT_ENABLE,
 171                          sc->ether.interrupt_enable_mask);
 172         }
 173 }
 174
 175 void dc_stop_intr(struct channel *sc)
 176 {
 177         sc->ether.interrupt_enable_mask = 0;
 178         dc_write(sc->addr, SBE_2T3E3_21143_REG_INTERRUPT_ENABLE, 0);
 179 }
 180
 181 void dc_reset(struct channel *sc)
 182 {
 183         /* turn off ethernet interrupts */
 184         dc_write(sc->addr, SBE_2T3E3_21143_REG_INTERRUPT_ENABLE, 0);
 185         dc_write(sc->addr, SBE_2T3E3_21143_REG_STATUS, 0xFFFFFFFF);
 186
 187         /* software reset */
 188         dc_set_bits(sc->addr, SBE_2T3E3_21143_REG_BUS_MODE,
 189                    SBE_2T3E3_21143_VAL_SOFTWARE_RESET);
 190         udelay(4); /* 50 PCI cycles < 2us */
 191
 192         /* clear hardware configuration */
 193         dc_write(sc->addr, SBE_2T3E3_21143_REG_BUS_MODE, 0);
 194
 195         /* clear software configuration */
 196         dc_write(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE, 0);
 197
 198         /* turn off SIA reset */
 199         dc_set_bits(sc->addr, SBE_2T3E3_21143_REG_SIA_CONNECTIVITY,
 200                    SBE_2T3E3_21143_VAL_SIA_RESET);
 201         dc_write(sc->addr, SBE_2T3E3_21143_REG_SIA_TRANSMIT_AND_RECEIVE, 0);
 202         dc_write(sc->addr, SBE_2T3E3_21143_REG_SIA_AND_GENERAL_PURPOSE_PORT, 0);
 203 }
 204
 205
 206 void dc_receiver_onoff(struct channel *sc, u32 mode)
 207 {
 208         u32 i, state = 0;
 209
 210         if (sc->p.receiver_on == mode)
 211                 return;
 212
 213         switch (mode) {
 214         case SBE_2T3E3_OFF:
 215                 if (dc_read(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE) &
 216                     SBE_2T3E3_21143_VAL_RECEIVE_START) {
 217                         dc_clear_bits(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE,
 218                                       SBE_2T3E3_21143_VAL_RECEIVE_START);
 219
 220                         for (i = 0; i < 16; i++) {
 221                                 state = dc_read(sc->addr, SBE_2T3E3_21143_REG_STATUS) &
 222                                         SBE_2T3E3_21143_VAL_RECEIVE_PROCESS_STATE;
 223                                 if (state == SBE_2T3E3_21143_VAL_RX_STOPPED)
 224                                         break;
 225                                 udelay(5);
 226                         }
 227                         if (state != SBE_2T3E3_21143_VAL_RX_STOPPED)
 228                                 dev_warn(&sc->pdev->dev, "SBE 2T3E3: Rx failed to stop\n");
 229                         else
 230                                 dev_info(&sc->pdev->dev, "SBE 2T3E3: Rx off\n");
 231                 }
 232                 break;
 233         case SBE_2T3E3_ON:
 234                 dc_set_bits(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE,
 235                            SBE_2T3E3_21143_VAL_RECEIVE_START);
 236                 udelay(100);
 237                 dc_write(sc->addr, SBE_2T3E3_21143_REG_RECEIVE_POLL_DEMAND, 0xFFFFFFFF);
 238                 break;
 239         default:
 240                 return;
 241         }
 242
 243         sc->p.receiver_on = mode;
 244 }
 245
 246 void dc_transmitter_onoff(struct channel *sc, u32 mode)
 247 {
 248         u32 i, state = 0;
 249
 250         if (sc->p.transmitter_on == mode)
 251                 return;
 252
 253         switch (mode) {
 254         case SBE_2T3E3_OFF:
 255                 if (dc_read(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE) &
 256                     SBE_2T3E3_21143_VAL_TRANSMISSION_START) {
 257                         dc_clear_bits(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE,
 258                                       SBE_2T3E3_21143_VAL_TRANSMISSION_START);
 259
 260                         for (i = 0; i < 16; i++) {
 261                                 state = dc_read(sc->addr, SBE_2T3E3_21143_REG_STATUS) &
 262                                         SBE_2T3E3_21143_VAL_TRANSMISSION_PROCESS_STATE;
 263                                 if (state == SBE_2T3E3_21143_VAL_TX_STOPPED)
 264                                         break;
 265                                 udelay(5);
 266                         }
 267                         if (state != SBE_2T3E3_21143_VAL_TX_STOPPED)
 268                                 dev_warn(&sc->pdev->dev, "SBE 2T3E3: Tx failed to stop\n");
 269                 }
 270                 break;
 271         case SBE_2T3E3_ON:
 272                 dc_set_bits(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE,
 273                            SBE_2T3E3_21143_VAL_TRANSMISSION_START);
 274                 udelay(100);
 275                 dc_write(sc->addr, SBE_2T3E3_21143_REG_TRANSMIT_POLL_DEMAND, 0xFFFFFFFF);
 276                 break;
 277         default:
 278                 return;
 279         }
 280
 281         sc->p.transmitter_on = mode;
 282 }
 283
 284
 285
 286 void dc_set_loopback(struct channel *sc, u32 mode)
 287 {
 288         u32 val;
 289
 290         switch (mode) {
 291         case SBE_2T3E3_21143_VAL_LOOPBACK_OFF:
 292         case SBE_2T3E3_21143_VAL_LOOPBACK_INTERNAL:
 293                 break;
 294         default:
 295                 return;
 296         }
 297
 298         /* select loopback mode */
 299         val = dc_read(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE) &
 300                 ~SBE_2T3E3_21143_VAL_OPERATING_MODE;
 301         val |= mode;
 302         dc_write(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE, val);
 303
 304         if (mode == SBE_2T3E3_21143_VAL_LOOPBACK_OFF)
 305                 dc_set_bits(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE,
 306                            SBE_2T3E3_21143_VAL_FULL_DUPLEX_MODE);
 307         else
 308                 dc_clear_bits(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE,
 309                               SBE_2T3E3_21143_VAL_FULL_DUPLEX_MODE);
 310 }
 311
 312 static int dc_init_descriptor_list(struct channel *sc)
 313 {
 314         u32 i, j;
 315         struct sk_buff *m;
 316
 317         if (sc->ether.rx_ring == NULL)
 318                 sc->ether.rx_ring = kcalloc(SBE_2T3E3_RX_DESC_RING_SIZE,
 319                                             sizeof(t3e3_rx_desc_t), GFP_KERNEL);
 320         if (sc->ether.rx_ring == NULL)
 321                 return -ENOMEM;
 322
 323         if (sc->ether.tx_ring == NULL)
 324                 sc->ether.tx_ring = kcalloc(SBE_2T3E3_TX_DESC_RING_SIZE,
 325                                             sizeof(t3e3_tx_desc_t), GFP_KERNEL);
 326         if (sc->ether.tx_ring == NULL) {
 327                 kfree(sc->ether.rx_ring);
 328                 sc->ether.rx_ring = NULL;
 329                 return -ENOMEM;
 330         }
 331
 332
 333         /*
 334          * Receive ring
 335          */
 336         for (i = 0; i < SBE_2T3E3_RX_DESC_RING_SIZE; i++) {
 337                 sc->ether.rx_ring[i].rdes0 = SBE_2T3E3_RX_DESC_21143_OWN;
 338                 sc->ether.rx_ring[i].rdes1 =
 339                         SBE_2T3E3_RX_DESC_SECOND_ADDRESS_CHAINED | SBE_2T3E3_MTU;
 340
 341                 if (sc->ether.rx_data[i] == NULL) {
 342                         if (!(m = dev_alloc_skb(MCLBYTES))) {
 343                                 for (j = 0; j < i; j++) {
 344                                         dev_kfree_skb_any(sc->ether.rx_data[j]);
 345                                         sc->ether.rx_data[j] = NULL;
 346                                 }
 347                                 kfree(sc->ether.rx_ring);
 348                                 sc->ether.rx_ring = NULL;
 349                                 kfree(sc->ether.tx_ring);
 350                                 sc->ether.tx_ring = NULL;
 351                                 dev_err(&sc->pdev->dev, "SBE 2T3E3: token_alloc err:"
 352                                         " no buffer space for RX ring\n");
 353                                 return -ENOBUFS;
 354                         }
 355                         sc->ether.rx_data[i] = m;
 356                 }
 357                 sc->ether.rx_ring[i].rdes2 = virt_to_phys(sc->ether.rx_data[i]->data);
 358
 359                 sc->ether.rx_ring[i].rdes3 = virt_to_phys(
 360                         &sc->ether.rx_ring[(i + 1) % SBE_2T3E3_RX_DESC_RING_SIZE]);
 361         }
 362         sc->ether.rx_ring[SBE_2T3E3_RX_DESC_RING_SIZE - 1].rdes1 |=
 363                 SBE_2T3E3_RX_DESC_END_OF_RING;
 364         sc->ether.rx_ring_current_read = 0;
 365
 366         dc_write(sc->addr, SBE_2T3E3_21143_REG_RECEIVE_LIST_BASE_ADDRESS,
 367                  virt_to_phys(&sc->ether.rx_ring[0]));
 368
 369         /*
 370          * Transmit ring
 371          */
 372         for (i = 0; i < SBE_2T3E3_TX_DESC_RING_SIZE; i++) {
 373                 sc->ether.tx_ring[i].tdes0 = 0;
 374                 sc->ether.tx_ring[i].tdes1 = SBE_2T3E3_TX_DESC_SECOND_ADDRESS_CHAINED |
 375                         SBE_2T3E3_TX_DESC_DISABLE_PADDING;
 376
 377                 sc->ether.tx_ring[i].tdes2 = 0;
 378                 sc->ether.tx_data[i] = NULL;
 379
 380                 sc->ether.tx_ring[i].tdes3 = virt_to_phys(
 381                         &sc->ether.tx_ring[(i + 1) % SBE_2T3E3_TX_DESC_RING_SIZE]);
 382         }
 383         sc->ether.tx_ring[SBE_2T3E3_TX_DESC_RING_SIZE - 1].tdes1 |=
 384                 SBE_2T3E3_TX_DESC_END_OF_RING;
 385
 386         dc_write(sc->addr, SBE_2T3E3_21143_REG_TRANSMIT_LIST_BASE_ADDRESS,
 387                  virt_to_phys(&sc->ether.tx_ring[0]));
 388         sc->ether.tx_ring_current_read = 0;
 389         sc->ether.tx_ring_current_write = 0;
 390         sc->ether.tx_free_cnt = SBE_2T3E3_TX_DESC_RING_SIZE;
 391         spin_lock_init(&sc->ether.tx_lock);
 392
 393         return 0;
 394 }
 395
 396 void dc_clear_descriptor_list(struct channel *sc)
 397 {
 398         u32 i;
 399
 400         /* clear CSR3 and CSR4 */
 401         dc_write(sc->addr, SBE_2T3E3_21143_REG_RECEIVE_LIST_BASE_ADDRESS, 0);
 402         dc_write(sc->addr, SBE_2T3E3_21143_REG_TRANSMIT_LIST_BASE_ADDRESS, 0);
 403
 404         /* free all data buffers on TX ring */
 405         for (i = 0; i < SBE_2T3E3_TX_DESC_RING_SIZE; i++) {
 406                 if (sc->ether.tx_data[i] != NULL) {
 407                         dev_kfree_skb_any(sc->ether.tx_data[i]);
 408                         sc->ether.tx_data[i] = NULL;
 409                 }
 410         }
 411 }
 412
 413 void dc_drop_descriptor_list(struct channel *sc)
 414 {
 415         u32 i;
 416
 417         dc_clear_descriptor_list(sc);
 418
 419         /* free all data buffers on RX ring */
 420         for (i = 0; i < SBE_2T3E3_RX_DESC_RING_SIZE; i++) {
 421                 if (sc->ether.rx_data[i] != NULL) {
 422                         dev_kfree_skb_any(sc->ether.rx_data[i]);
 423                         sc->ether.rx_data[i] = NULL;
 424                 }
 425         }
 426
 427         kfree(sc->ether.rx_ring);
 428         sc->ether.rx_ring = NULL;
 429         kfree(sc->ether.tx_ring);
 430         sc->ether.tx_ring = NULL;
 431 }
 432
 433
 434 void dc_set_output_port(struct channel *sc)
 435 {
 436         dc_clear_bits(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE,
 437                       SBE_2T3E3_21143_VAL_PORT_SELECT);
 438
 439         dc_write(sc->addr, SBE_2T3E3_21143_REG_SIA_STATUS, 0x00000301);
 440         dc_write(sc->addr, SBE_2T3E3_21143_REG_SIA_CONNECTIVITY, 0);
 441         dc_write(sc->addr, SBE_2T3E3_21143_REG_SIA_TRANSMIT_AND_RECEIVE, 0);
 442         dc_write(sc->addr, SBE_2T3E3_21143_REG_SIA_AND_GENERAL_PURPOSE_PORT, 0x08000011);
 443
 444         dc_set_bits(sc->addr, SBE_2T3E3_21143_REG_OPERATION_MODE,
 445                    SBE_2T3E3_21143_VAL_TRANSMIT_THRESHOLD_MODE_100Mbs |
 446                    SBE_2T3E3_21143_VAL_HEARTBEAT_DISABLE |
 447                    SBE_2T3E3_21143_VAL_PORT_SELECT |
 448                    SBE_2T3E3_21143_VAL_FULL_DUPLEX_MODE);
 449 }
 450
 451 void dc_restart(struct channel *sc)
 452 {
 453         dev_warn(&sc->pdev->dev, "SBE 2T3E3: 21143 restart\n");
 454
 455         dc_stop(sc);
 456         dc_reset(sc);
 457         dc_init(sc);    /* stop + reset + init */
 458         dc_start(sc);
 459 }