git.oblomov.eu Git - linux-2.6/blob - drivers/spi/spi_bfin5xx.c

   1 /*
   2  * File:         drivers/spi/bfin5xx_spi.c
   3  * Based on:     N/A
   4  * Author:       Luke Yang (Analog Devices Inc.)
   5  *
   6  * Created:      March. 10th 2006
   7  * Description:  SPI controller driver for Blackfin 5xx
   8  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
   9  *
  10  * Modified:
  11  *      March 10, 2006  bfin5xx_spi.c Created. (Luke Yang)
  12  *      August 7, 2006  added full duplex mode (Axel Weiss & Luke Yang)
  13  *
  14  * Copyright 2004-2006 Analog Devices Inc.
  15  *
  16  * This program is free software ;  you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation ;  either version 2, or (at your option)
  19  * any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY ;  without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program ;  see the file COPYING.
  28  * If not, write to the Free Software Foundation,
  29  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  30  */
  31
  32 #include <linux/init.h>
  33 #include <linux/module.h>
  34 #include <linux/device.h>
  35 #include <linux/ioport.h>
  36 #include <linux/errno.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/spi/spi.h>
  41 #include <linux/workqueue.h>
  42 #include <linux/delay.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/delay.h>
  47 #include <asm/dma.h>
  48
  49 #include <asm/bfin5xx_spi.h>
  50
  51 MODULE_AUTHOR("Luke Yang");
  52 MODULE_DESCRIPTION("Blackfin 5xx SPI Contoller");
  53 MODULE_LICENSE("GPL");
  54
  55 #define IS_DMA_ALIGNED(x) (((u32)(x)&0x07)==0)
  56
  57 #define DEFINE_SPI_REG(reg, off) \
  58 static inline u16 read_##reg(void) \
  59             { return *(volatile unsigned short*)(SPI0_REGBASE + off); } \
  60 static inline void write_##reg(u16 v) \
  61             {*(volatile unsigned short*)(SPI0_REGBASE + off) = v;\
  62              SSYNC();}
  63
  64 DEFINE_SPI_REG(CTRL, 0x00)
  65 DEFINE_SPI_REG(FLAG, 0x04)
  66 DEFINE_SPI_REG(STAT, 0x08)
  67 DEFINE_SPI_REG(TDBR, 0x0C)
  68 DEFINE_SPI_REG(RDBR, 0x10)
  69 DEFINE_SPI_REG(BAUD, 0x14)
  70 DEFINE_SPI_REG(SHAW, 0x18)
  71 #define START_STATE ((void*)0)
  72 #define RUNNING_STATE ((void*)1)
  73 #define DONE_STATE ((void*)2)
  74 #define ERROR_STATE ((void*)-1)
  75 #define QUEUE_RUNNING 0
  76 #define QUEUE_STOPPED 1
  77 int dma_requested;
  78
  79 struct driver_data {
  80         /* Driver model hookup */
  81         struct platform_device *pdev;
  82
  83         /* SPI framework hookup */
  84         struct spi_master *master;
  85
  86         /* BFIN hookup */
  87         struct bfin5xx_spi_master *master_info;
  88
  89         /* Driver message queue */
  90         struct workqueue_struct *workqueue;
  91         struct work_struct pump_messages;
  92         spinlock_t lock;
  93         struct list_head queue;
  94         int busy;
  95         int run;
  96
  97         /* Message Transfer pump */
  98         struct tasklet_struct pump_transfers;
  99
 100         /* Current message transfer state info */
 101         struct spi_message *cur_msg;
 102         struct spi_transfer *cur_transfer;
 103         struct chip_data *cur_chip;
 104         size_t len_in_bytes;
 105         size_t len;
 106         void *tx;
 107         void *tx_end;
 108         void *rx;
 109         void *rx_end;
 110         int dma_mapped;
 111         dma_addr_t rx_dma;
 112         dma_addr_t tx_dma;
 113         size_t rx_map_len;
 114         size_t tx_map_len;
 115         u8 n_bytes;
 116         void (*write) (struct driver_data *);
 117         void (*read) (struct driver_data *);
 118         void (*duplex) (struct driver_data *);
 119 };
 120
 121 struct chip_data {
 122         u16 ctl_reg;
 123         u16 baud;
 124         u16 flag;
 125
 126         u8 chip_select_num;
 127         u8 n_bytes;
 128         u8 width;               /* 0 or 1 */
 129         u8 enable_dma;
 130         u8 bits_per_word;       /* 8 or 16 */
 131         u8 cs_change_per_word;
 132         u8 cs_chg_udelay;
 133         void (*write) (struct driver_data *);
 134         void (*read) (struct driver_data *);
 135         void (*duplex) (struct driver_data *);
 136 };
 137
 138 static void bfin_spi_enable(struct driver_data *drv_data)
 139 {
 140         u16 cr;
 141
 142         cr = read_CTRL();
 143         write_CTRL(cr | BIT_CTL_ENABLE);
 144         SSYNC();
 145 }
 146
 147 static void bfin_spi_disable(struct driver_data *drv_data)
 148 {
 149         u16 cr;
 150
 151         cr = read_CTRL();
 152         write_CTRL(cr & (~BIT_CTL_ENABLE));
 153         SSYNC();
 154 }
 155
 156 /* Caculate the SPI_BAUD register value based on input HZ */
 157 static u16 hz_to_spi_baud(u32 speed_hz)
 158 {
 159         u_long sclk = get_sclk();
 160         u16 spi_baud = (sclk / (2 * speed_hz));
 161
 162         if ((sclk % (2 * speed_hz)) > 0)
 163                 spi_baud++;
 164
 165         return spi_baud;
 166 }
 167
 168 static int flush(struct driver_data *drv_data)
 169 {
 170         unsigned long limit = loops_per_jiffy << 1;
 171
 172         /* wait for stop and clear stat */
 173         while (!(read_STAT() & BIT_STAT_SPIF) && limit--)
 174                 continue;
 175
 176         write_STAT(BIT_STAT_CLR);
 177
 178         return limit;
 179 }
 180
 181 /* stop controller and re-config current chip*/
 182 static void restore_state(struct driver_data *drv_data)
 183 {
 184         struct chip_data *chip = drv_data->cur_chip;
 185
 186         /* Clear status and disable clock */
 187         write_STAT(BIT_STAT_CLR);
 188         bfin_spi_disable(drv_data);
 189         dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n");
 190
 191 #if defined(CONFIG_BF534) || defined(CONFIG_BF536) || defined(CONFIG_BF537)
 192         dev_dbg(&drv_data->pdev->dev,
 193                 "chip select number is %d\n", chip->chip_select_num);
 194
 195         switch (chip->chip_select_num) {
 196         case 1:
 197                 bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3c00);
 198                 SSYNC();
 199                 break;
 200
 201         case 2:
 202         case 3:
 203                 bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PJSE_SPI);
 204                 SSYNC();
 205                 bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3800);
 206                 SSYNC();
 207                 break;
 208
 209         case 4:
 210                 bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PFS4E_SPI);
 211                 SSYNC();
 212                 bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3840);
 213                 SSYNC();
 214                 break;
 215
 216         case 5:
 217                 bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PFS5E_SPI);
 218                 SSYNC();
 219                 bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3820);
 220                 SSYNC();
 221                 break;
 222
 223         case 6:
 224                 bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PFS6E_SPI);
 225                 SSYNC();
 226                 bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3810);
 227                 SSYNC();
 228                 break;
 229
 230         case 7:
 231                 bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PJCE_SPI);
 232                 SSYNC();
 233                 bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3800);
 234                 SSYNC();
 235                 break;
 236         }
 237 #endif
 238
 239         /* Load the registers */
 240         write_CTRL(chip->ctl_reg);
 241         write_BAUD(chip->baud);
 242         write_FLAG(chip->flag);
 243 }
 244
 245 /* used to kick off transfer in rx mode */
 246 static unsigned short dummy_read(void)
 247 {
 248         unsigned short tmp;
 249         tmp = read_RDBR();
 250         return tmp;
 251 }
 252
 253 static void null_writer(struct driver_data *drv_data)
 254 {
 255         u8 n_bytes = drv_data->n_bytes;
 256
 257         while (drv_data->tx < drv_data->tx_end) {
 258                 write_TDBR(0);
 259                 while ((read_STAT() & BIT_STAT_TXS))
 260                         continue;
 261                 drv_data->tx += n_bytes;
 262         }
 263 }
 264
 265 static void null_reader(struct driver_data *drv_data)
 266 {
 267         u8 n_bytes = drv_data->n_bytes;
 268         dummy_read();
 269
 270         while (drv_data->rx < drv_data->rx_end) {
 271                 while (!(read_STAT() & BIT_STAT_RXS))
 272                         continue;
 273                 dummy_read();
 274                 drv_data->rx += n_bytes;
 275         }
 276 }
 277
 278 static void u8_writer(struct driver_data *drv_data)
 279 {
 280         dev_dbg(&drv_data->pdev->dev,
 281                 "cr8-s is 0x%x\n", read_STAT());
 282         while (drv_data->tx < drv_data->tx_end) {
 283                 write_TDBR(*(u8 *) (drv_data->tx));
 284                 while (read_STAT() & BIT_STAT_TXS)
 285                         continue;
 286                 ++drv_data->tx;
 287         }
 288
 289         /* poll for SPI completion before returning */
 290         while (!(read_STAT() & BIT_STAT_SPIF))
 291                 continue;
 292 }
 293
 294 static void u8_cs_chg_writer(struct driver_data *drv_data)
 295 {
 296         struct chip_data *chip = drv_data->cur_chip;
 297
 298         while (drv_data->tx < drv_data->tx_end) {
 299                 write_FLAG(chip->flag);
 300                 SSYNC();
 301
 302                 write_TDBR(*(u8 *) (drv_data->tx));
 303                 while (read_STAT() & BIT_STAT_TXS)
 304                         continue;
 305                 while (!(read_STAT() & BIT_STAT_SPIF))
 306                         continue;
 307                 write_FLAG(0xFF00 | chip->flag);
 308                 SSYNC();
 309                 if (chip->cs_chg_udelay)
 310                         udelay(chip->cs_chg_udelay);
 311                 ++drv_data->tx;
 312         }
 313         write_FLAG(0xFF00);
 314         SSYNC();
 315 }
 316
 317 static void u8_reader(struct driver_data *drv_data)
 318 {
 319         dev_dbg(&drv_data->pdev->dev,
 320                 "cr-8 is 0x%x\n", read_STAT());
 321
 322         /* clear TDBR buffer before read(else it will be shifted out) */
 323         write_TDBR(0xFFFF);
 324
 325         dummy_read();
 326
 327         while (drv_data->rx < drv_data->rx_end - 1) {
 328                 while (!(read_STAT() & BIT_STAT_RXS))
 329                         continue;
 330                 *(u8 *) (drv_data->rx) = read_RDBR();
 331                 ++drv_data->rx;
 332         }
 333
 334         while (!(read_STAT() & BIT_STAT_RXS))
 335                 continue;
 336         *(u8 *) (drv_data->rx) = read_SHAW();
 337         ++drv_data->rx;
 338 }
 339
 340 static void u8_cs_chg_reader(struct driver_data *drv_data)
 341 {
 342         struct chip_data *chip = drv_data->cur_chip;
 343
 344         while (drv_data->rx < drv_data->rx_end) {
 345                 write_FLAG(chip->flag);
 346                 SSYNC();
 347
 348                 read_RDBR();    /* kick off */
 349                 while (!(read_STAT() & BIT_STAT_RXS))
 350                         continue;
 351                 while (!(read_STAT() & BIT_STAT_SPIF))
 352                         continue;
 353                 *(u8 *) (drv_data->rx) = read_SHAW();
 354                 write_FLAG(0xFF00 | chip->flag);
 355                 SSYNC();
 356                 if (chip->cs_chg_udelay)
 357                         udelay(chip->cs_chg_udelay);
 358                 ++drv_data->rx;
 359         }
 360         write_FLAG(0xFF00);
 361         SSYNC();
 362 }
 363
 364 static void u8_duplex(struct driver_data *drv_data)
 365 {
 366         /* in duplex mode, clk is triggered by writing of TDBR */
 367         while (drv_data->rx < drv_data->rx_end) {
 368                 write_TDBR(*(u8 *) (drv_data->tx));
 369                 while (!(read_STAT() & BIT_STAT_SPIF))
 370                         continue;
 371                 while (!(read_STAT() & BIT_STAT_RXS))
 372                         continue;
 373                 *(u8 *) (drv_data->rx) = read_RDBR();
 374                 ++drv_data->rx;
 375                 ++drv_data->tx;
 376         }
 377 }
 378
 379 static void u8_cs_chg_duplex(struct driver_data *drv_data)
 380 {
 381         struct chip_data *chip = drv_data->cur_chip;
 382
 383         while (drv_data->rx < drv_data->rx_end) {
 384                 write_FLAG(chip->flag);
 385                 SSYNC();
 386
 387                 write_TDBR(*(u8 *) (drv_data->tx));
 388                 while (!(read_STAT() & BIT_STAT_SPIF))
 389                         continue;
 390                 while (!(read_STAT() & BIT_STAT_RXS))
 391                         continue;
 392                 *(u8 *) (drv_data->rx) = read_RDBR();
 393                 write_FLAG(0xFF00 | chip->flag);
 394                 SSYNC();
 395                 if (chip->cs_chg_udelay)
 396                         udelay(chip->cs_chg_udelay);
 397                 ++drv_data->rx;
 398                 ++drv_data->tx;
 399         }
 400         write_FLAG(0xFF00);
 401         SSYNC();
 402 }
 403
 404 static void u16_writer(struct driver_data *drv_data)
 405 {
 406         dev_dbg(&drv_data->pdev->dev,
 407                 "cr16 is 0x%x\n", read_STAT());
 408
 409         while (drv_data->tx < drv_data->tx_end) {
 410                 write_TDBR(*(u16 *) (drv_data->tx));
 411                 while ((read_STAT() & BIT_STAT_TXS))
 412                         continue;
 413                 drv_data->tx += 2;
 414         }
 415
 416         /* poll for SPI completion before returning */
 417         while (!(read_STAT() & BIT_STAT_SPIF))
 418                 continue;
 419 }
 420
 421 static void u16_cs_chg_writer(struct driver_data *drv_data)
 422 {
 423         struct chip_data *chip = drv_data->cur_chip;
 424
 425         while (drv_data->tx < drv_data->tx_end) {
 426                 write_FLAG(chip->flag);
 427                 SSYNC();
 428
 429                 write_TDBR(*(u16 *) (drv_data->tx));
 430                 while ((read_STAT() & BIT_STAT_TXS))
 431                         continue;
 432                 while (!(read_STAT() & BIT_STAT_SPIF))
 433                         continue;
 434                 write_FLAG(0xFF00 | chip->flag);
 435                 SSYNC();
 436                 if (chip->cs_chg_udelay)
 437                         udelay(chip->cs_chg_udelay);
 438                 drv_data->tx += 2;
 439         }
 440         write_FLAG(0xFF00);
 441         SSYNC();
 442 }
 443
 444 static void u16_reader(struct driver_data *drv_data)
 445 {
 446         dev_dbg(&drv_data->pdev->dev,
 447                 "cr-16 is 0x%x\n", read_STAT());
 448         dummy_read();
 449
 450         while (drv_data->rx < (drv_data->rx_end - 2)) {
 451                 while (!(read_STAT() & BIT_STAT_RXS))
 452                         continue;
 453                 *(u16 *) (drv_data->rx) = read_RDBR();
 454                 drv_data->rx += 2;
 455         }
 456
 457         while (!(read_STAT() & BIT_STAT_RXS))
 458                 continue;
 459         *(u16 *) (drv_data->rx) = read_SHAW();
 460         drv_data->rx += 2;
 461 }
 462
 463 static void u16_cs_chg_reader(struct driver_data *drv_data)
 464 {
 465         struct chip_data *chip = drv_data->cur_chip;
 466
 467         while (drv_data->rx < drv_data->rx_end) {
 468                 write_FLAG(chip->flag);
 469                 SSYNC();
 470
 471                 read_RDBR();    /* kick off */
 472                 while (!(read_STAT() & BIT_STAT_RXS))
 473                         continue;
 474                 while (!(read_STAT() & BIT_STAT_SPIF))
 475                         continue;
 476                 *(u16 *) (drv_data->rx) = read_SHAW();
 477                 write_FLAG(0xFF00 | chip->flag);
 478                 SSYNC();
 479                 if (chip->cs_chg_udelay)
 480                         udelay(chip->cs_chg_udelay);
 481                 drv_data->rx += 2;
 482         }
 483         write_FLAG(0xFF00);
 484         SSYNC();
 485 }
 486
 487 static void u16_duplex(struct driver_data *drv_data)
 488 {
 489         /* in duplex mode, clk is triggered by writing of TDBR */
 490         while (drv_data->tx < drv_data->tx_end) {
 491                 write_TDBR(*(u16 *) (drv_data->tx));
 492                 while (!(read_STAT() & BIT_STAT_SPIF))
 493                         continue;
 494                 while (!(read_STAT() & BIT_STAT_RXS))
 495                         continue;
 496                 *(u16 *) (drv_data->rx) = read_RDBR();
 497                 drv_data->rx += 2;
 498                 drv_data->tx += 2;
 499         }
 500 }
 501
 502 static void u16_cs_chg_duplex(struct driver_data *drv_data)
 503 {
 504         struct chip_data *chip = drv_data->cur_chip;
 505
 506         while (drv_data->tx < drv_data->tx_end) {
 507                 write_FLAG(chip->flag);
 508                 SSYNC();
 509
 510                 write_TDBR(*(u16 *) (drv_data->tx));
 511                 while (!(read_STAT() & BIT_STAT_SPIF))
 512                         continue;
 513                 while (!(read_STAT() & BIT_STAT_RXS))
 514                         continue;
 515                 *(u16 *) (drv_data->rx) = read_RDBR();
 516                 write_FLAG(0xFF00 | chip->flag);
 517                 SSYNC();
 518                 if (chip->cs_chg_udelay)
 519                         udelay(chip->cs_chg_udelay);
 520                 drv_data->rx += 2;
 521                 drv_data->tx += 2;
 522         }
 523         write_FLAG(0xFF00);
 524         SSYNC();
 525 }
 526
 527 /* test if ther is more transfer to be done */
 528 static void *next_transfer(struct driver_data *drv_data)
 529 {
 530         struct spi_message *msg = drv_data->cur_msg;
 531         struct spi_transfer *trans = drv_data->cur_transfer;
 532
 533         /* Move to next transfer */
 534         if (trans->transfer_list.next != &msg->transfers) {
 535                 drv_data->cur_transfer =
 536                     list_entry(trans->transfer_list.next,
 537                                struct spi_transfer, transfer_list);
 538                 return RUNNING_STATE;
 539         } else
 540                 return DONE_STATE;
 541 }
 542
 543 /*
 544  * caller already set message->status;
 545  * dma and pio irqs are blocked give finished message back
 546  */
 547 static void giveback(struct driver_data *drv_data)
 548 {
 549         struct spi_transfer *last_transfer;
 550         unsigned long flags;
 551         struct spi_message *msg;
 552
 553         spin_lock_irqsave(&drv_data->lock, flags);
 554         msg = drv_data->cur_msg;
 555         drv_data->cur_msg = NULL;
 556         drv_data->cur_transfer = NULL;
 557         drv_data->cur_chip = NULL;
 558         queue_work(drv_data->workqueue, &drv_data->pump_messages);
 559         spin_unlock_irqrestore(&drv_data->lock, flags);
 560
 561         last_transfer = list_entry(msg->transfers.prev,
 562                                    struct spi_transfer, transfer_list);
 563
 564         msg->state = NULL;
 565
 566         /* disable chip select signal. And not stop spi in autobuffer mode */
 567         if (drv_data->tx_dma != 0xFFFF) {
 568                 write_FLAG(0xFF00);
 569                 bfin_spi_disable(drv_data);
 570         }
 571
 572         if (msg->complete)
 573                 msg->complete(msg->context);
 574 }
 575
 576 static irqreturn_t dma_irq_handler(int irq, void *dev_id)
 577 {
 578         struct driver_data *drv_data = (struct driver_data *)dev_id;
 579         struct spi_message *msg = drv_data->cur_msg;
 580
 581         dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n");
 582         clear_dma_irqstat(CH_SPI);
 583
 584         /* Wait for DMA to complete */
 585         while (get_dma_curr_irqstat(CH_SPI) & DMA_RUN)
 586                 continue;
 587
 588         /*
 589          * wait for the last transaction shifted out.  HRM states:
 590          * at this point there may still be data in the SPI DMA FIFO waiting
 591          * to be transmitted ... software needs to poll TXS in the SPI_STAT
 592          * register until it goes low for 2 successive reads
 593          */
 594         if (drv_data->tx != NULL) {
 595                 while ((bfin_read_SPI_STAT() & TXS) ||
 596                        (bfin_read_SPI_STAT() & TXS))
 597                         continue;
 598         }
 599
 600         while (!(bfin_read_SPI_STAT() & SPIF))
 601                 continue;
 602
 603         bfin_spi_disable(drv_data);
 604
 605         msg->actual_length += drv_data->len_in_bytes;
 606
 607         /* Move to next transfer */
 608         msg->state = next_transfer(drv_data);
 609
 610         /* Schedule transfer tasklet */
 611         tasklet_schedule(&drv_data->pump_transfers);
 612
 613         /* free the irq handler before next transfer */
 614         dev_dbg(&drv_data->pdev->dev,
 615                 "disable dma channel irq%d\n",
 616                 CH_SPI);
 617         dma_disable_irq(CH_SPI);
 618
 619         return IRQ_HANDLED;
 620 }
 621
 622 static void pump_transfers(unsigned long data)
 623 {
 624         struct driver_data *drv_data = (struct driver_data *)data;
 625         struct spi_message *message = NULL;
 626         struct spi_transfer *transfer = NULL;
 627         struct spi_transfer *previous = NULL;
 628         struct chip_data *chip = NULL;
 629         u8 width;
 630         u16 cr, dma_width, dma_config;
 631         u32 tranf_success = 1;
 632
 633         /* Get current state information */
 634         message = drv_data->cur_msg;
 635         transfer = drv_data->cur_transfer;
 636         chip = drv_data->cur_chip;
 637
 638         /*
 639          * if msg is error or done, report it back using complete() callback
 640          */
 641
 642          /* Handle for abort */
 643         if (message->state == ERROR_STATE) {
 644                 message->status = -EIO;
 645                 giveback(drv_data);
 646                 return;
 647         }
 648
 649         /* Handle end of message */
 650         if (message->state == DONE_STATE) {
 651                 message->status = 0;
 652                 giveback(drv_data);
 653                 return;
 654         }
 655
 656         /* Delay if requested at end of transfer */
 657         if (message->state == RUNNING_STATE) {
 658                 previous = list_entry(transfer->transfer_list.prev,
 659                                       struct spi_transfer, transfer_list);
 660                 if (previous->delay_usecs)
 661                         udelay(previous->delay_usecs);
 662         }
 663
 664         /* Setup the transfer state based on the type of transfer */
 665         if (flush(drv_data) == 0) {
 666                 dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n");
 667                 message->status = -EIO;
 668                 giveback(drv_data);
 669                 return;
 670         }
 671
 672         if (transfer->tx_buf != NULL) {
 673                 drv_data->tx = (void *)transfer->tx_buf;
 674                 drv_data->tx_end = drv_data->tx + transfer->len;
 675                 dev_dbg(&drv_data->pdev->dev, "tx_buf is %p, tx_end is %p\n",
 676                         transfer->tx_buf, drv_data->tx_end);
 677         } else {
 678                 drv_data->tx = NULL;
 679         }
 680
 681         if (transfer->rx_buf != NULL) {
 682                 drv_data->rx = transfer->rx_buf;
 683                 drv_data->rx_end = drv_data->rx + transfer->len;
 684                 dev_dbg(&drv_data->pdev->dev, "rx_buf is %p, rx_end is %p\n",
 685                         transfer->rx_buf, drv_data->rx_end);
 686         } else {
 687                 drv_data->rx = NULL;
 688         }
 689
 690         drv_data->rx_dma = transfer->rx_dma;
 691         drv_data->tx_dma = transfer->tx_dma;
 692         drv_data->len_in_bytes = transfer->len;
 693
 694         width = chip->width;
 695         if (width == CFG_SPI_WORDSIZE16) {
 696                 drv_data->len = (transfer->len) >> 1;
 697         } else {
 698                 drv_data->len = transfer->len;
 699         }
 700         drv_data->write = drv_data->tx ? chip->write : null_writer;
 701         drv_data->read = drv_data->rx ? chip->read : null_reader;
 702         drv_data->duplex = chip->duplex ? chip->duplex : null_writer;
 703         dev_dbg(&drv_data->pdev->dev,
 704                 "transfer: drv_data->write is %p, chip->write is %p, null_wr is %p\n",
 705                 drv_data->write, chip->write, null_writer);
 706
 707         /* speed and width has been set on per message */
 708         message->state = RUNNING_STATE;
 709         dma_config = 0;
 710
 711         /* restore spi status for each spi transfer */
 712         if (transfer->speed_hz) {
 713                 write_BAUD(hz_to_spi_baud(transfer->speed_hz));
 714         } else {
 715                 write_BAUD(chip->baud);
 716         }
 717         write_FLAG(chip->flag);
 718
 719         dev_dbg(&drv_data->pdev->dev,
 720                 "now pumping a transfer: width is %d, len is %d\n",
 721                 width, transfer->len);
 722
 723         /*
 724          * Try to map dma buffer and do a dma transfer if
 725          * successful use different way to r/w according to
 726          * drv_data->cur_chip->enable_dma
 727          */
 728         if (drv_data->cur_chip->enable_dma && drv_data->len > 6) {
 729
 730                 write_STAT(BIT_STAT_CLR);
 731                 disable_dma(CH_SPI);
 732                 clear_dma_irqstat(CH_SPI);
 733                 bfin_spi_disable(drv_data);
 734
 735                 /* config dma channel */
 736                 dev_dbg(&drv_data->pdev->dev, "doing dma transfer\n");
 737                 if (width == CFG_SPI_WORDSIZE16) {
 738                         set_dma_x_count(CH_SPI, drv_data->len);
 739                         set_dma_x_modify(CH_SPI, 2);
 740                         dma_width = WDSIZE_16;
 741                 } else {
 742                         set_dma_x_count(CH_SPI, drv_data->len);
 743                         set_dma_x_modify(CH_SPI, 1);
 744                         dma_width = WDSIZE_8;
 745                 }
 746
 747                 /* set transfer width,direction. And enable spi */
 748                 cr = (read_CTRL() & (~BIT_CTL_TIMOD));
 749
 750                 /* dirty hack for autobuffer DMA mode */
 751                 if (drv_data->tx_dma == 0xFFFF) {
 752                         dev_dbg(&drv_data->pdev->dev,
 753                                 "doing autobuffer DMA out.\n");
 754
 755                         /* no irq in autobuffer mode */
 756                         dma_config =
 757                             (DMAFLOW_AUTO | RESTART | dma_width | DI_EN);
 758                         set_dma_config(CH_SPI, dma_config);
 759                         set_dma_start_addr(CH_SPI, (unsigned long)drv_data->tx);
 760                         enable_dma(CH_SPI);
 761                         write_CTRL(cr | CFG_SPI_DMAWRITE | (width << 8) |
 762                                    (CFG_SPI_ENABLE << 14));
 763
 764                         /* just return here, there can only be one transfer in this mode */
 765                         message->status = 0;
 766                         giveback(drv_data);
 767                         return;
 768                 }
 769
 770                 /* In dma mode, rx or tx must be NULL in one transfer */
 771                 if (drv_data->rx != NULL) {
 772                         /* set transfer mode, and enable SPI */
 773                         dev_dbg(&drv_data->pdev->dev, "doing DMA in.\n");
 774
 775                         /* disable SPI before write to TDBR */
 776                         write_CTRL(cr & ~BIT_CTL_ENABLE);
 777
 778                         /* clear tx reg soformer data is not shifted out */
 779                         write_TDBR(0xFF);
 780
 781                         set_dma_x_count(CH_SPI, drv_data->len);
 782
 783                         /* start dma */
 784                         dma_enable_irq(CH_SPI);
 785                         dma_config = (WNR | RESTART | dma_width | DI_EN);
 786                         set_dma_config(CH_SPI, dma_config);
 787                         set_dma_start_addr(CH_SPI, (unsigned long)drv_data->rx);
 788                         enable_dma(CH_SPI);
 789
 790                         cr |=
 791                             CFG_SPI_DMAREAD | (width << 8) | (CFG_SPI_ENABLE <<
 792                                                               14);
 793                         /* set transfer mode, and enable SPI */
 794                         write_CTRL(cr);
 795                 } else if (drv_data->tx != NULL) {
 796                         dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n");
 797
 798                         /* start dma */
 799                         dma_enable_irq(CH_SPI);
 800                         dma_config = (RESTART | dma_width | DI_EN);
 801                         set_dma_config(CH_SPI, dma_config);
 802                         set_dma_start_addr(CH_SPI, (unsigned long)drv_data->tx);
 803                         enable_dma(CH_SPI);
 804
 805                         write_CTRL(cr | CFG_SPI_DMAWRITE | (width << 8) |
 806                                    (CFG_SPI_ENABLE << 14));
 807
 808                 }
 809         } else {
 810                 /* IO mode write then read */
 811                 dev_dbg(&drv_data->pdev->dev, "doing IO transfer\n");
 812
 813                 write_STAT(BIT_STAT_CLR);
 814
 815                 if (drv_data->tx != NULL && drv_data->rx != NULL) {
 816                         /* full duplex mode */
 817                         BUG_ON((drv_data->tx_end - drv_data->tx) !=
 818                                (drv_data->rx_end - drv_data->rx));
 819                         cr = (read_CTRL() & (~BIT_CTL_TIMOD));
 820                         cr |= CFG_SPI_WRITE | (width << 8) |
 821                                 (CFG_SPI_ENABLE << 14);
 822                         dev_dbg(&drv_data->pdev->dev,
 823                                 "IO duplex: cr is 0x%x\n", cr);
 824
 825                         write_CTRL(cr);
 826                         SSYNC();
 827
 828                         drv_data->duplex(drv_data);
 829
 830                         if (drv_data->tx != drv_data->tx_end)
 831                                 tranf_success = 0;
 832                 } else if (drv_data->tx != NULL) {
 833                         /* write only half duplex */
 834                         cr = (read_CTRL() & (~BIT_CTL_TIMOD));
 835                         cr |= CFG_SPI_WRITE | (width << 8) |
 836                                 (CFG_SPI_ENABLE << 14);
 837                         dev_dbg(&drv_data->pdev->dev,
 838                                 "IO write: cr is 0x%x\n", cr);
 839
 840                         write_CTRL(cr);
 841                         SSYNC();
 842
 843                         drv_data->write(drv_data);
 844
 845                         if (drv_data->tx != drv_data->tx_end)
 846                                 tranf_success = 0;
 847                 } else if (drv_data->rx != NULL) {
 848                         /* read only half duplex */
 849                         cr = (read_CTRL() & (~BIT_CTL_TIMOD));
 850                         cr |= CFG_SPI_READ | (width << 8) |
 851                                 (CFG_SPI_ENABLE << 14);
 852                         dev_dbg(&drv_data->pdev->dev,
 853                                 "IO read: cr is 0x%x\n", cr);
 854
 855                         write_CTRL(cr);
 856                         SSYNC();
 857
 858                         drv_data->read(drv_data);
 859                         if (drv_data->rx != drv_data->rx_end)
 860                                 tranf_success = 0;
 861                 }
 862
 863                 if (!tranf_success) {
 864                         dev_dbg(&drv_data->pdev->dev,
 865                                 "IO write error!\n");
 866                         message->state = ERROR_STATE;
 867                 } else {
 868                         /* Update total byte transfered */
 869                         message->actual_length += drv_data->len;
 870
 871                         /* Move to next transfer of this msg */
 872                         message->state = next_transfer(drv_data);
 873                 }
 874
 875                 /* Schedule next transfer tasklet */
 876                 tasklet_schedule(&drv_data->pump_transfers);
 877
 878         }
 879 }
 880
 881 /* pop a msg from queue and kick off real transfer */
 882 static void pump_messages(struct work_struct *work)
 883 {
 884         struct driver_data *drv_data = container_of(work, struct driver_data, pump_messages);
 885         unsigned long flags;
 886
 887         /* Lock queue and check for queue work */
 888         spin_lock_irqsave(&drv_data->lock, flags);
 889         if (list_empty(&drv_data->queue) || drv_data->run == QUEUE_STOPPED) {
 890                 /* pumper kicked off but no work to do */
 891                 drv_data->busy = 0;
 892                 spin_unlock_irqrestore(&drv_data->lock, flags);
 893                 return;
 894         }
 895
 896         /* Make sure we are not already running a message */
 897         if (drv_data->cur_msg) {
 898                 spin_unlock_irqrestore(&drv_data->lock, flags);
 899                 return;
 900         }
 901
 902         /* Extract head of queue */
 903         drv_data->cur_msg = list_entry(drv_data->queue.next,
 904                                        struct spi_message, queue);
 905         list_del_init(&drv_data->cur_msg->queue);
 906
 907         /* Initial message state */
 908         drv_data->cur_msg->state = START_STATE;
 909         drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
 910                                             struct spi_transfer, transfer_list);
 911
 912         /* Setup the SSP using the per chip configuration */
 913         drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
 914         restore_state(drv_data);
 915         dev_dbg(&drv_data->pdev->dev,
 916                 "got a message to pump, state is set to: baud %d, flag 0x%x, ctl 0x%x\n",
 917                 drv_data->cur_chip->baud, drv_data->cur_chip->flag,
 918                 drv_data->cur_chip->ctl_reg);
 919
 920         dev_dbg(&drv_data->pdev->dev,
 921                 "the first transfer len is %d\n",
 922                 drv_data->cur_transfer->len);
 923
 924         /* Mark as busy and launch transfers */
 925         tasklet_schedule(&drv_data->pump_transfers);
 926
 927         drv_data->busy = 1;
 928         spin_unlock_irqrestore(&drv_data->lock, flags);
 929 }
 930
 931 /*
 932  * got a msg to transfer, queue it in drv_data->queue.
 933  * And kick off message pumper
 934  */
 935 static int transfer(struct spi_device *spi, struct spi_message *msg)
 936 {
 937         struct driver_data *drv_data = spi_master_get_devdata(spi->master);
 938         unsigned long flags;
 939
 940         spin_lock_irqsave(&drv_data->lock, flags);
 941
 942         if (drv_data->run == QUEUE_STOPPED) {
 943                 spin_unlock_irqrestore(&drv_data->lock, flags);
 944                 return -ESHUTDOWN;
 945         }
 946
 947         msg->actual_length = 0;
 948         msg->status = -EINPROGRESS;
 949         msg->state = START_STATE;
 950
 951         dev_dbg(&spi->dev, "adding an msg in transfer() \n");
 952         list_add_tail(&msg->queue, &drv_data->queue);
 953
 954         if (drv_data->run == QUEUE_RUNNING && !drv_data->busy)
 955                 queue_work(drv_data->workqueue, &drv_data->pump_messages);
 956
 957         spin_unlock_irqrestore(&drv_data->lock, flags);
 958
 959         return 0;
 960 }
 961
 962 /* first setup for new devices */
 963 static int setup(struct spi_device *spi)
 964 {
 965         struct bfin5xx_spi_chip *chip_info = NULL;
 966         struct chip_data *chip;
 967         struct driver_data *drv_data = spi_master_get_devdata(spi->master);
 968         u8 spi_flg;
 969
 970         /* Abort device setup if requested features are not supported */
 971         if (spi->mode & ~(SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST)) {
 972                 dev_err(&spi->dev, "requested mode not fully supported\n");
 973                 return -EINVAL;
 974         }
 975
 976         /* Zero (the default) here means 8 bits */
 977         if (!spi->bits_per_word)
 978                 spi->bits_per_word = 8;
 979
 980         if (spi->bits_per_word != 8 && spi->bits_per_word != 16)
 981                 return -EINVAL;
 982
 983         /* Only alloc (or use chip_info) on first setup */
 984         chip = spi_get_ctldata(spi);
 985         if (chip == NULL) {
 986                 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
 987                 if (!chip)
 988                         return -ENOMEM;
 989
 990                 chip->enable_dma = 0;
 991                 chip_info = spi->controller_data;
 992         }
 993
 994         /* chip_info isn't always needed */
 995         if (chip_info) {
 996                 chip->enable_dma = chip_info->enable_dma != 0
 997                     && drv_data->master_info->enable_dma;
 998                 chip->ctl_reg = chip_info->ctl_reg;
 999                 chip->bits_per_word = chip_info->bits_per_word;
1000                 chip->cs_change_per_word = chip_info->cs_change_per_word;
1001                 chip->cs_chg_udelay = chip_info->cs_chg_udelay;
1002         }
1003
1004         /* translate common spi framework into our register */
1005         if (spi->mode & SPI_CPOL)
1006                 chip->ctl_reg |= CPOL;
1007         if (spi->mode & SPI_CPHA)
1008                 chip->ctl_reg |= CPHA;
1009         if (spi->mode & SPI_LSB_FIRST)
1010                 chip->ctl_reg |= LSBF;
1011         /* we dont support running in slave mode (yet?) */
1012         chip->ctl_reg |= MSTR;
1013
1014         /*
1015          * if any one SPI chip is registered and wants DMA, request the
1016          * DMA channel for it
1017          */
1018         if (chip->enable_dma && !dma_requested) {
1019                 /* register dma irq handler */
1020                 if (request_dma(CH_SPI, "BF53x_SPI_DMA") < 0) {
1021                         dev_dbg(&spi->dev,
1022                                 "Unable to request BlackFin SPI DMA channel\n");
1023                         return -ENODEV;
1024                 }
1025                 if (set_dma_callback(CH_SPI, (void *)dma_irq_handler, drv_data)
1026                     < 0) {
1027                         dev_dbg(&spi->dev, "Unable to set dma callback\n");
1028                         return -EPERM;
1029                 }
1030                 dma_disable_irq(CH_SPI);
1031                 dma_requested = 1;
1032         }
1033
1034         /*
1035          * Notice: for blackfin, the speed_hz is the value of register
1036          * SPI_BAUD, not the real baudrate
1037          */
1038         chip->baud = hz_to_spi_baud(spi->max_speed_hz);
1039         spi_flg = ~(1 << (spi->chip_select));
1040         chip->flag = ((u16) spi_flg << 8) | (1 << (spi->chip_select));
1041         chip->chip_select_num = spi->chip_select;
1042
1043         switch (chip->bits_per_word) {
1044         case 8:
1045                 chip->n_bytes = 1;
1046                 chip->width = CFG_SPI_WORDSIZE8;
1047                 chip->read = chip->cs_change_per_word ?
1048                         u8_cs_chg_reader : u8_reader;
1049                 chip->write = chip->cs_change_per_word ?
1050                         u8_cs_chg_writer : u8_writer;
1051                 chip->duplex = chip->cs_change_per_word ?
1052                         u8_cs_chg_duplex : u8_duplex;
1053                 break;
1054
1055         case 16:
1056                 chip->n_bytes = 2;
1057                 chip->width = CFG_SPI_WORDSIZE16;
1058                 chip->read = chip->cs_change_per_word ?
1059                         u16_cs_chg_reader : u16_reader;
1060                 chip->write = chip->cs_change_per_word ?
1061                         u16_cs_chg_writer : u16_writer;
1062                 chip->duplex = chip->cs_change_per_word ?
1063                         u16_cs_chg_duplex : u16_duplex;
1064                 break;
1065
1066         default:
1067                 dev_err(&spi->dev, "%d bits_per_word is not supported\n",
1068                                 chip->bits_per_word);
1069                 kfree(chip);
1070                 return -ENODEV;
1071         }
1072
1073         dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n",
1074                         spi->modalias, chip->width, chip->enable_dma);
1075         dev_dbg(&spi->dev, "ctl_reg is 0x%x, flag_reg is 0x%x\n",
1076                         chip->ctl_reg, chip->flag);
1077
1078         spi_set_ctldata(spi, chip);
1079
1080         return 0;
1081 }
1082
1083 /*
1084  * callback for spi framework.
1085  * clean driver specific data
1086  */
1087 static void cleanup(struct spi_device *spi)
1088 {
1089         struct chip_data *chip = spi_get_ctldata(spi);
1090
1091         kfree(chip);
1092 }
1093
1094 static inline int init_queue(struct driver_data *drv_data)
1095 {
1096         INIT_LIST_HEAD(&drv_data->queue);
1097         spin_lock_init(&drv_data->lock);
1098
1099         drv_data->run = QUEUE_STOPPED;
1100         drv_data->busy = 0;
1101
1102         /* init transfer tasklet */
1103         tasklet_init(&drv_data->pump_transfers,
1104                      pump_transfers, (unsigned long)drv_data);
1105
1106         /* init messages workqueue */
1107         INIT_WORK(&drv_data->pump_messages, pump_messages);
1108         drv_data->workqueue =
1109             create_singlethread_workqueue(drv_data->master->dev.parent->bus_id);
1110         if (drv_data->workqueue == NULL)
1111                 return -EBUSY;
1112
1113         return 0;
1114 }
1115
1116 static inline int start_queue(struct driver_data *drv_data)
1117 {
1118         unsigned long flags;
1119
1120         spin_lock_irqsave(&drv_data->lock, flags);
1121
1122         if (drv_data->run == QUEUE_RUNNING || drv_data->busy) {
1123                 spin_unlock_irqrestore(&drv_data->lock, flags);
1124                 return -EBUSY;
1125         }
1126
1127         drv_data->run = QUEUE_RUNNING;
1128         drv_data->cur_msg = NULL;
1129         drv_data->cur_transfer = NULL;
1130         drv_data->cur_chip = NULL;
1131         spin_unlock_irqrestore(&drv_data->lock, flags);
1132
1133         queue_work(drv_data->workqueue, &drv_data->pump_messages);
1134
1135         return 0;
1136 }
1137
1138 static inline int stop_queue(struct driver_data *drv_data)
1139 {
1140         unsigned long flags;
1141         unsigned limit = 500;
1142         int status = 0;
1143
1144         spin_lock_irqsave(&drv_data->lock, flags);
1145
1146         /*
1147          * This is a bit lame, but is optimized for the common execution path.
1148          * A wait_queue on the drv_data->busy could be used, but then the common
1149          * execution path (pump_messages) would be required to call wake_up or
1150          * friends on every SPI message. Do this instead
1151          */
1152         drv_data->run = QUEUE_STOPPED;
1153         while (!list_empty(&drv_data->queue) && drv_data->busy && limit--) {
1154                 spin_unlock_irqrestore(&drv_data->lock, flags);
1155                 msleep(10);
1156                 spin_lock_irqsave(&drv_data->lock, flags);
1157         }
1158
1159         if (!list_empty(&drv_data->queue) || drv_data->busy)
1160                 status = -EBUSY;
1161
1162         spin_unlock_irqrestore(&drv_data->lock, flags);
1163
1164         return status;
1165 }
1166
1167 static inline int destroy_queue(struct driver_data *drv_data)
1168 {
1169         int status;
1170
1171         status = stop_queue(drv_data);
1172         if (status != 0)
1173                 return status;
1174
1175         destroy_workqueue(drv_data->workqueue);
1176
1177         return 0;
1178 }
1179
1180 static int __init bfin5xx_spi_probe(struct platform_device *pdev)
1181 {
1182         struct device *dev = &pdev->dev;
1183         struct bfin5xx_spi_master *platform_info;
1184         struct spi_master *master;
1185         struct driver_data *drv_data = 0;
1186         int status = 0;
1187
1188         platform_info = dev->platform_data;
1189
1190         /* Allocate master with space for drv_data */
1191         master = spi_alloc_master(dev, sizeof(struct driver_data) + 16);
1192         if (!master) {
1193                 dev_err(&pdev->dev, "can not alloc spi_master\n");
1194                 return -ENOMEM;
1195         }
1196         drv_data = spi_master_get_devdata(master);
1197         drv_data->master = master;
1198         drv_data->master_info = platform_info;
1199         drv_data->pdev = pdev;
1200
1201         master->bus_num = pdev->id;
1202         master->num_chipselect = platform_info->num_chipselect;
1203         master->cleanup = cleanup;
1204         master->setup = setup;
1205         master->transfer = transfer;
1206
1207         /* Initial and start queue */
1208         status = init_queue(drv_data);
1209         if (status != 0) {
1210                 dev_err(&pdev->dev, "problem initializing queue\n");
1211                 goto out_error_queue_alloc;
1212         }
1213         status = start_queue(drv_data);
1214         if (status != 0) {
1215                 dev_err(&pdev->dev, "problem starting queue\n");
1216                 goto out_error_queue_alloc;
1217         }
1218
1219         /* Register with the SPI framework */
1220         platform_set_drvdata(pdev, drv_data);
1221         status = spi_register_master(master);
1222         if (status != 0) {
1223                 dev_err(&pdev->dev, "problem registering spi master\n");
1224                 goto out_error_queue_alloc;
1225         }
1226         dev_dbg(&pdev->dev, "controller probe successfully\n");
1227         return status;
1228
1229       out_error_queue_alloc:
1230         destroy_queue(drv_data);
1231         spi_master_put(master);
1232         return status;
1233 }
1234
1235 /* stop hardware and remove the driver */
1236 static int __devexit bfin5xx_spi_remove(struct platform_device *pdev)
1237 {
1238         struct driver_data *drv_data = platform_get_drvdata(pdev);
1239         int status = 0;
1240
1241         if (!drv_data)
1242                 return 0;
1243
1244         /* Remove the queue */
1245         status = destroy_queue(drv_data);
1246         if (status != 0)
1247                 return status;
1248
1249         /* Disable the SSP at the peripheral and SOC level */
1250         bfin_spi_disable(drv_data);
1251
1252         /* Release DMA */
1253         if (drv_data->master_info->enable_dma) {
1254                 if (dma_channel_active(CH_SPI))
1255                         free_dma(CH_SPI);
1256         }
1257
1258         /* Disconnect from the SPI framework */
1259         spi_unregister_master(drv_data->master);
1260
1261         /* Prevent double remove */
1262         platform_set_drvdata(pdev, NULL);
1263
1264         return 0;
1265 }
1266
1267 #ifdef CONFIG_PM
1268 static int bfin5xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
1269 {
1270         struct driver_data *drv_data = platform_get_drvdata(pdev);
1271         int status = 0;
1272
1273         status = stop_queue(drv_data);
1274         if (status != 0)
1275                 return status;
1276
1277         /* stop hardware */
1278         bfin_spi_disable(drv_data);
1279
1280         return 0;
1281 }
1282
1283 static int bfin5xx_spi_resume(struct platform_device *pdev)
1284 {
1285         struct driver_data *drv_data = platform_get_drvdata(pdev);
1286         int status = 0;
1287
1288         /* Enable the SPI interface */
1289         bfin_spi_enable(drv_data);
1290
1291         /* Start the queue running */
1292         status = start_queue(drv_data);
1293         if (status != 0) {
1294                 dev_err(&pdev->dev, "problem starting queue (%d)\n", status);
1295                 return status;
1296         }
1297
1298         return 0;
1299 }
1300 #else
1301 #define bfin5xx_spi_suspend NULL
1302 #define bfin5xx_spi_resume NULL
1303 #endif                          /* CONFIG_PM */
1304
1305 MODULE_ALIAS("bfin-spi-master");        /* for platform bus hotplug */
1306 static struct platform_driver bfin5xx_spi_driver = {
1307         .driver = {
1308                 .name   = "bfin-spi-master",
1309                 .owner  = THIS_MODULE,
1310         },
1311         .suspend        = bfin5xx_spi_suspend,
1312         .resume         = bfin5xx_spi_resume,
1313         .remove         = __devexit_p(bfin5xx_spi_remove),
1314 };
1315
1316 static int __init bfin5xx_spi_init(void)
1317 {
1318         return platform_driver_probe(&bfin5xx_spi_driver, bfin5xx_spi_probe);
1319 }
1320 module_init(bfin5xx_spi_init);
1321
1322 static void __exit bfin5xx_spi_exit(void)
1323 {
1324         platform_driver_unregister(&bfin5xx_spi_driver);
1325 }
1326 module_exit(bfin5xx_spi_exit);