target/linux/cns3xxx/patches-2.6.31/207-cns3xxx_spi_support.patch

   1 --- a/drivers/spi/Kconfig
   2 +++ b/drivers/spi/Kconfig
   3 @@ -236,6 +236,39 @@ config SPI_XILINX
   4           See the "OPB Serial Peripheral Interface (SPI) (v1.00e)"
   5           Product Specification document (DS464) for hardware details.
   6
   7 +config SPI_CNS3XXX
   8 +       tristate "CNS3XXX SPI controller"
   9 +       depends on ARCH_CNS3XXX && SPI_MASTER && EXPERIMENTAL
  10 +       select SPI_BITBANG
  11 +       help
  12 +         This enables using the CNS3XXX SPI controller in master
  13 +         mode.
  14 +
  15 +config SPI_CNS3XXX_DEBUG
  16 +       boolean "Debug support for CNS3XXX SPI drivers"
  17 +       depends on SPI_CNS3XXX
  18 +       help
  19 +         Say "yes" to enable debug messaging
  20 +
  21 +config SPI_CNS3XXX_2IOREAD
  22 +       bool "CNS3XXX SPI 2 IO Read Mode"
  23 +       depends on SPI_CNS3XXX
  24 +       help
  25 +         This enables 2 IO Read Mode
  26 +
  27 +config SPI_CNS3XXX_USEDMA
  28 +       bool "CNS3XXX SPI DMA Mode"
  29 +       depends on SPI_CNS3XXX
  30 +       select CNS3XXX_DMAC
  31 +       help
  32 +         This enables DMA Mode
  33 +
  34 +config SPI_CNS3XXX_USEDMA_DEBUG
  35 +       boolean "Debug support for CNS3XXX SPI DMA drivers"
  36 +       depends on SPI_CNS3XXX_USEDMA
  37 +       help
  38 +         Say "yes" to enable debug messaging
  39 +
  40  #
  41  # Add new SPI master controllers in alphabetical order above this line
  42  #
  43 --- a/drivers/spi/Makefile
  44 +++ b/drivers/spi/Makefile
  45 @@ -32,6 +32,7 @@ obj-$(CONFIG_SPI_S3C24XX)             += spi_s3c24x
  46  obj-$(CONFIG_SPI_TXX9)                 += spi_txx9.o
  47  obj-$(CONFIG_SPI_XILINX)               += xilinx_spi.o
  48  obj-$(CONFIG_SPI_SH_SCI)               += spi_sh_sci.o
  49 +obj-$(CONFIG_SPI_CNS3XXX)              += spi_cns3xxx.o
  50  #      ... add above this line ...
  51
  52  # SPI protocol drivers (device/link on bus)
  53 --- a/drivers/spi/spi_bitbang.c
  54 +++ b/drivers/spi/spi_bitbang.c
  55 @@ -334,6 +334,14 @@ static void bitbang_work(struct work_str
  56                                  */
  57                                 if (!m->is_dma_mapped)
  58                                         t->rx_dma = t->tx_dma = 0;
  59 +
  60 +#ifdef CONFIG_ARCH_CNS3XXX
  61 +                if (t->transfer_list.next == &m->transfers) {
  62 +                    t->last_in_message_list = 1;
  63 +                } else {
  64 +                    t->last_in_message_list = 0;
  65 +                }
  66 +#endif
  67                                 status = bitbang->txrx_bufs(spi, t);
  68                         }
  69                         if (status > 0)
  70 --- a/drivers/spi/spi.c
  71 +++ b/drivers/spi/spi.c
  72 @@ -769,6 +769,89 @@ int spi_write_then_read(struct spi_devic
  73  }
  74  EXPORT_SYMBOL_GPL(spi_write_then_read);
  75
  76 +#ifdef CONFIG_ARCH_CNS3XXX
  77 +/**
  78 + * spi_write_read_sync - SPI synchronous write & read
  79 + * @spi: device with which data will be exchanged
  80 + * @txbuf: data to be written (need not be dma-safe)
  81 + * @n_tx: size of txbuf, in bytes
  82 + * @rxbuf: buffer into which data will be read
  83 + * @n_rx: size of rxbuf, in bytes (need not be dma-safe)
  84 + *
  85 + * This performs a half duplex MicroWire style transaction with the
  86 + * device, sending txbuf and then reading rxbuf.  The return value
  87 + * is zero for success, else a negative errno status code.
  88 + * This call may only be used from a context that may sleep.
  89 + *
  90 + * Parameters to this routine are always copied using a small buffer;
  91 + * performance-sensitive or bulk transfer code should instead use
  92 + * spi_{async,sync}() calls with dma-safe buffers.
  93 + */
  94 +int spi_write_read_sync(struct spi_device *spi,
  95 +               const u8 *txbuf, unsigned n_tx,
  96 +               u8 *rxbuf, unsigned n_rx)
  97 +{
  98 +       static DECLARE_MUTEX(lock);
  99 +
 100 +       int         status;
 101 +       struct spi_message  message;
 102 +       struct spi_transfer x;
 103 +       u8          *local_buf;
 104 +
 105 +       /* Use preallocated DMA-safe buffer.  We can't avoid copying here,
 106 +        * (as a pure convenience thing), but we can keep heap costs
 107 +        * out of the hot path ...
 108 +        */
 109 +#if 0
 110 +    while (!str8131_spi_bus_idle()){
 111 +        printk("spi bus is not idle \n"); // do nothing
 112 +        }
 113 +    while (!str8131_spi_tx_buffer_empty()){
 114 +        printk("spi tx buffer is not empty \n"); // do nothing
 115 +        }
 116 +#endif
 117 +       if ((n_tx + n_rx) > SPI_BUFSIZ)
 118 +               return -EINVAL;
 119 +       spi_message_init(&message);
 120 +       memset(&x, 0, sizeof x);
 121 +       x.len = n_tx;
 122 +       spi_message_add_tail(&x, &message);
 123 +
 124 +       /* ... unless someone else is using the pre-allocated buffer */
 125 +       if (down_trylock(&lock)) {
 126 +               local_buf = kmalloc(SPI_BUFSIZ, GFP_KERNEL);
 127 +               if (!local_buf)
 128 +                       return -ENOMEM;
 129 +       } else
 130 +               local_buf = buf;
 131 +
 132 +       memcpy(local_buf, txbuf, n_tx);
 133 +       x.tx_buf = local_buf;
 134 +       x.rx_buf = local_buf + n_tx;
 135 +
 136 +       /* do the i/o */
 137 +       status = spi_sync(spi, &message);
 138 +       if (status == 0) {
 139 +               memcpy(rxbuf, x.rx_buf, n_rx);
 140 +               status = message.status;
 141 +       }
 142 +
 143 +       if (x.tx_buf == buf)
 144 +               up(&lock);
 145 +       else
 146 +               kfree(local_buf);
 147 +
 148 +       return status;
 149 +}
 150 +
 151 +EXPORT_SYMBOL_GPL(spi_write_read_sync);
 152 +#endif /* CONFIG_ARCH_CNS3XXX */
 153 +
 154 +
 155 +
 156 +
 157 +
 158 +
 159  /*-------------------------------------------------------------------------*/
 160
 161  static int __init spi_init(void)
 162 --- /dev/null
 163 +++ b/drivers/spi/spi_cns3xxx.c
 164 @@ -0,0 +1,878 @@
 165 +/*******************************************************************************
 166 + *
 167 + *  CNS3XXX SPI controller driver (master mode only)
 168 + *
 169 + *  Copyright (c) 2008 Cavium Networks
 170 + *
 171 + *  This file is free software; you can redistribute it and/or modify
 172 + *  it under the terms of the GNU General Public License, Version 2, as
 173 + *  published by the Free Software Foundation.
 174 + *
 175 + *  This file is distributed in the hope that it will be useful,
 176 + *  but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
 177 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 178 + *  NONINFRINGEMENT.  See the GNU General Public License for more details.
 179 + *
 180 + *  You should have received a copy of the GNU General Public License
 181 + *  along with this file; if not, write to the Free Software
 182 + *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
 183 + *  visit http://www.gnu.org/licenses/.
 184 + *
 185 + *  This file may also be available under a different license from Cavium.
 186 + *  Contact Cavium Networks for more information
 187 + *
 188 + ******************************************************************************/
 189 +
 190 +#include <linux/init.h>
 191 +#include <linux/spinlock.h>
 192 +#include <linux/workqueue.h>
 193 +#include <linux/interrupt.h>
 194 +#include <linux/delay.h>
 195 +#include <linux/errno.h>
 196 +#include <linux/err.h>
 197 +#include <linux/clk.h>
 198 +#include <linux/platform_device.h>
 199 +
 200 +#include <linux/spi/spi.h>
 201 +#include <linux/spi/spi_bitbang.h>
 202 +#include <linux/mtd/partitions.h>
 203 +#include <linux/dma-mapping.h>
 204 +
 205 +#include <asm/io.h>
 206 +#include <asm/memory.h>
 207 +#include <asm/dma.h>
 208 +#include <asm/delay.h>
 209 +#include <mach/board.h>
 210 +#include <mach/dmac.h>
 211 +#include <linux/module.h>
 212 +#include <mach/misc.h>
 213 +#include <mach/gpio.h>
 214 +#include <mach/pm.h>
 215 +
 216 +#define LE8221_SPI_CS          1
 217 +#define SI3226_SPI_CS          1
 218 +
 219 +#define CNS3XXX_SPI_INTERRUPT
 220 +#undef CNS3XXX_SPI_INTERRUPT   /* Interrupt is not supported for D2 and SEN */
 221 +
 222 +/*
 223 + * define access macros
 224 + */
 225 +#define SPI_MEM_MAP_VALUE(reg_offset)          (*((u32 volatile *)(CNS3XXX_SSP_BASE_VIRT + reg_offset)))
 226 +
 227 +#define SPI_CONFIGURATION_REG                  SPI_MEM_MAP_VALUE(0x40)
 228 +#define SPI_SERVICE_STATUS_REG                 SPI_MEM_MAP_VALUE(0x44)
 229 +#define SPI_BIT_RATE_CONTROL_REG               SPI_MEM_MAP_VALUE(0x48)
 230 +#define SPI_TRANSMIT_CONTROL_REG               SPI_MEM_MAP_VALUE(0x4C)
 231 +#define SPI_TRANSMIT_BUFFER_REG                        SPI_MEM_MAP_VALUE(0x50)
 232 +#define SPI_RECEIVE_CONTROL_REG                        SPI_MEM_MAP_VALUE(0x54)
 233 +#define SPI_RECEIVE_BUFFER_REG                 SPI_MEM_MAP_VALUE(0x58)
 234 +#define SPI_FIFO_TRANSMIT_CONFIG_REG           SPI_MEM_MAP_VALUE(0x5C)
 235 +#define SPI_FIFO_TRANSMIT_CONTROL_REG          SPI_MEM_MAP_VALUE(0x60)
 236 +#define SPI_FIFO_RECEIVE_CONFIG_REG            SPI_MEM_MAP_VALUE(0x64)
 237 +#define SPI_INTERRUPT_STATUS_REG               SPI_MEM_MAP_VALUE(0x68)
 238 +#define SPI_INTERRUPT_ENABLE_REG               SPI_MEM_MAP_VALUE(0x6C)
 239 +
 240 +#define SPI_TRANSMIT_BUFFER_REG_ADDR           (CNS3XXX_SSP_BASE +0x50)
 241 +#define SPI_RECEIVE_BUFFER_REG_ADDR            (CNS3XXX_SSP_BASE +0x58)
 242 +
 243 +/* Structure for SPI controller of CNS3XXX SOCs */
 244 +struct cns3xxx_spi {
 245 +       /* bitbang has to be first */
 246 +       struct spi_bitbang bitbang;
 247 +       struct completion done;
 248 +       wait_queue_head_t wait;
 249 +
 250 +       int len;
 251 +       int count;
 252 +       int last_in_message_list;
 253 +
 254 +       /* data buffers */
 255 +       const unsigned char *tx;
 256 +       unsigned char *rx;
 257 +
 258 +       struct spi_master *master;
 259 +       struct platform_device *pdev;
 260 +       struct device *dev;
 261 +};
 262 +
 263 +static inline u8 cns3xxx_spi_bus_idle(void)
 264 +{
 265 +       return ((SPI_SERVICE_STATUS_REG & 0x1) ? 0 : 1);
 266 +}
 267 +
 268 +static inline u8 cns3xxx_spi_tx_buffer_empty(void)
 269 +{
 270 +       return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 3)) ? 1 : 0);
 271 +}
 272 +
 273 +static inline u8 cns3xxx_spi_rx_buffer_full(void)
 274 +{
 275 +       return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 2)) ? 1 : 0);
 276 +}
 277 +
 278 +u8 cns3xxx_spi_tx_rx(u8 tx_channel, u8 tx_eof, u32 tx_data,
 279 +                           u32 * rx_data)
 280 +{
 281 +       u8 rx_channel;
 282 +       u8 rx_eof;
 283 +
 284 +       while (!cns3xxx_spi_bus_idle()) ;       // do nothing
 285 +
 286 +       while (!cns3xxx_spi_tx_buffer_empty()) ;        // do nothing
 287 +
 288 +       SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
 289 +       SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
 290 +
 291 +       SPI_TRANSMIT_BUFFER_REG = tx_data;
 292 +
 293 +       while (!cns3xxx_spi_rx_buffer_full()) ; // do nothing
 294 +
 295 +       rx_channel = SPI_RECEIVE_CONTROL_REG & 0x3;
 296 +       rx_eof = (SPI_RECEIVE_CONTROL_REG & (0x1 << 2)) ? 1 : 0;
 297 +
 298 +       *rx_data = SPI_RECEIVE_BUFFER_REG;
 299 +
 300 +       if ((tx_channel != rx_channel) || (tx_eof != rx_eof)) {
 301 +               return 0;
 302 +       } else {
 303 +               return 1;
 304 +       }
 305 +}
 306 +
 307 +u8 cns3xxx_spi_tx(u8 tx_channel, u8 tx_eof, u32 tx_data)
 308 +{
 309 +
 310 +        while (!cns3xxx_spi_bus_idle()) ;       // do nothing
 311 +
 312 +        while (!cns3xxx_spi_tx_buffer_empty()) ;        // do nothing
 313 +
 314 +        SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
 315 +        SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
 316 +
 317 +        SPI_TRANSMIT_BUFFER_REG = tx_data;
 318 +
 319 +        return 1;
 320 +}
 321 +
 322 +
 323 +
 324 +#ifdef CONFIG_SPI_CNS3XXX_DEBUG
 325 +static void spi_slave_probe(void)
 326 +{
 327 +       int i;
 328 +       u32 rx_data1, rx_data2, rx_data3;
 329 +
 330 +       cns3xxx_spi_tx_rx(0, 0, 0x9f, &rx_data1);
 331 +       cns3xxx_spi_tx_rx(0, 0, 0xff, &rx_data1);
 332 +       cns3xxx_spi_tx_rx(0, 0, 0xff, &rx_data2);
 333 +       cns3xxx_spi_tx_rx(0, 1, 0xff, &rx_data3);
 334 +       printk("[SPI_CNS3XXX_DEBUG] manufacturer: %x\n", rx_data1);
 335 +       printk("[SPI_CNS3XXX_DEBUG] device:       %x\n",
 336 +              ((rx_data2 & 0xff) << 8) | (u16) (rx_data3 & 0xff));
 337 +
 338 +       cns3xxx_spi_tx_rx(0, 0, 0x03, &rx_data1);
 339 +       cns3xxx_spi_tx_rx(0, 0, 0x00, &rx_data1);
 340 +       cns3xxx_spi_tx_rx(0, 0, 0x00, &rx_data1);
 341 +       cns3xxx_spi_tx_rx(0, 0, 0x00, &rx_data1);
 342 +       for (i = 0; i < 15; i++) {
 343 +               cns3xxx_spi_tx_rx(0, 0, 0xff, &rx_data1);
 344 +               printk("[SPI_CNS3XXX_DEBUG] flash[%02d]:0x%02x\n", i,
 345 +                      rx_data1 & 0xff);
 346 +       }
 347 +       cns3xxx_spi_tx_rx(0, 1, 0xff, &rx_data1);
 348 +       printk("[SPI_CNS3XXX_DEBUG] flash[%02d]:0x%02x\n", i, rx_data1 & 0xff);
 349 +}
 350 +#else
 351 +#define spi_slave_probe()      do{}while(0)
 352 +#endif
 353 +
 354 +static inline struct cns3xxx_spi *to_hw(struct spi_device *sdev)
 355 +{
 356 +       return spi_master_get_devdata(sdev->master);
 357 +}
 358 +
 359 +static int cns3xxx_spi_setup_transfer(struct spi_device *spi,
 360 +                                     struct spi_transfer *t)
 361 +{
 362 +       return 0;
 363 +}
 364 +
 365 +static void cns3xxx_spi_chipselect(struct spi_device *spi, int value)
 366 +{
 367 +       unsigned int spi_config;
 368 +
 369 +       switch (value) {
 370 +       case BITBANG_CS_INACTIVE:
 371 +               break;
 372 +
 373 +       case BITBANG_CS_ACTIVE:
 374 +               spi_config = SPI_CONFIGURATION_REG;
 375 +
 376 +               if (spi->mode & SPI_CPHA)
 377 +                       spi_config |= (0x1 << 13);
 378 +               else
 379 +                       spi_config &= ~(0x1 << 13);
 380 +
 381 +               if (spi->mode & SPI_CPOL)
 382 +                       spi_config |= (0x1 << 14);
 383 +               else
 384 +                       spi_config &= ~(0x1 << 14);
 385 +
 386 +               /* write new configration */
 387 +               SPI_CONFIGURATION_REG = spi_config;
 388 +
 389 +               SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
 390 +               SPI_TRANSMIT_CONTROL_REG |= (spi->chip_select & 0x3);
 391 +
 392 +#if defined(CONFIG_LE8221_CONTROL)
 393 +               if (spi->chip_select == LE8221_SPI_CS) {
 394 +                       SPI_CONFIGURATION_REG |= (0x1 << 9);
 395 +               }
 396 +#elif defined (CONFIG_SI3226_CONTROL_API)
 397 +               if (spi->chip_select == SI3226_SPI_CS) {
 398 +                       SPI_CONFIGURATION_REG &= ~(0x1 << 9);
 399 +               }
 400 +#endif
 401 +               break;
 402 +       }
 403 +}
 404 +
 405 +static int cns3xxx_spi_setup(struct spi_device *spi)
 406 +{
 407 +       if (!spi->bits_per_word)
 408 +               spi->bits_per_word = 8;
 409 +
 410 +       return 0;
 411 +}
 412 +
 413 +#ifdef CONFIG_SPI_CNS3XXX_USEDMA
 414 +
 415 +int cns3xxx_spi_dma_irq_handler(void *pdata)
 416 +{
 417 +
 418 +       struct cns3xxx_spi *hw = pdata;
 419 +       complete(&hw->done);
 420 +
 421 +       return 0;
 422 +}
 423 +
 424 +static int cns3xxx_spi_dma_initialize(int *rxchan, int *txchan, int *rxevtno,
 425 +                                     int *txevtno, void *handlerargs)
 426 +{
 427 +       *rxchan = dmac_get_channel(cns3xxx_spi_dma_irq_handler, handlerargs);
 428 +       if ((*rxchan) == -1)
 429 +               goto fail1;
 430 +       *txchan = dmac_get_channel(NULL, NULL);
 431 +       if ((*txchan) == -1)
 432 +               goto fail2;
 433 +       *rxevtno = 9;
 434 +       if (dmac_get_event(*rxchan, *rxevtno) == -1)
 435 +               goto fail3;
 436 +       *txevtno = 10;
 437 +       if (dmac_get_event(*txchan, *txevtno) == -1)
 438 +               goto fail4;
 439 +       return 0;
 440 +
 441 +fail4:
 442 +       dmac_release_event(*rxchan, *rxevtno);
 443 +fail3:
 444 +       dmac_release_channel(*txchan);
 445 +fail2:
 446 +       dmac_release_channel(*rxchan);
 447 +fail1:
 448 +       return -1;
 449 +}
 450 +
 451 +static int cns3xxx_spi_start_dma(int rch, int tch, int rev, int tev,
 452 +                                struct spi_transfer *t, struct cns3xxx_spi *hw)
 453 +{
 454 +       static void *dummy;
 455 +       static dma_addr_t dummy_dma;
 456 +       dma_addr_t rdma, tdma;
 457 +       int rx_inc, tx_inc;
 458 +       int lc0, totlps, lc1, rump;
 459 +       u32 rx_data;
 460 +
 461 +       if (!dummy) {
 462 +               dummy = dma_alloc_coherent(NULL, 16, &dummy_dma, GFP_KERNEL);
 463 +#ifdef CONFIG_SPI_CNS3XXX_DEBUG_DMA
 464 +               printk("Allocated Memory for dummy buffer va:%p,pa:%x\n", dummy,
 465 +                      dummy_dma);
 466 +#endif
 467 +       }
 468 +       if (!dummy) {
 469 +               return -1;
 470 +       }
 471 +       *((uint32_t *) dummy) = 0xffffffff;
 472 +
 473 +       (t->tx_buf) ? (tdma = t->tx_dma, tx_inc = 1) :
 474 +           (tdma = dummy_dma, tx_inc = 0);
 475 +       (t->rx_buf) ? (rdma = t->rx_dma, rx_inc = 1) :
 476 +           (rdma = dummy_dma, rx_inc = 0);
 477 +
 478 +#ifdef CONFIG_SPI_CNS3XXX_DEBUG_DMA
 479 +       printk("Here with tdma %x, rdma %x\n", tdma, rdma);
 480 +#endif
 481 +
 482 +        if(t->len < 3) {
 483 +               if(t->len == 2){
 484 +                       cns3xxx_spi_tx_rx(0,0,(t->tx_buf) ? hw->tx[0] : 0xff ,&rx_data);
 485 +               if(!(t->tx_buf))
 486 +                       hw->rx[0] = rx_data & 0xff;
 487 +               }
 488 +                cns3xxx_spi_dma_irq_handler(hw);
 489 +                return 0;
 490 +        }
 491 +
 492 +
 493 +       totlps = t->len - 1 -1;
 494 +       if (totlps > 0x100) {
 495 +               lc0 = 0x100;
 496 +               lc1 = totlps / lc0;
 497 +               rump = totlps % lc0;
 498 +       } else {
 499 +               lc0 = totlps;
 500 +               lc1 = 0;
 501 +               rump = 0;
 502 +       }
 503 +
 504 +       if(t->tx_buf) {
 505 +                cns3xxx_spi_tx(0,0,*((uint32_t *) t->tx_buf));
 506 +                tdma+=1;
 507 +        }
 508 +        else {
 509 +                cns3xxx_spi_tx(0,0,0xff);
 510 +        }
 511 +
 512 +       //SPI_RECEIVE_BUFFER_REG;
 513 +       {
 514 +               DMAC_DMAMOV(tch, SAR, tdma);
 515 +               DMAC_DMAMOV(tch, DAR, SPI_TRANSMIT_BUFFER_REG_ADDR);
 516 +               DMAC_DMAMOV(tch, CCR,
 517 +                           dmac_create_ctrlval(tx_inc, 1, 1, 0, 1, 1, 0));
 518 +               //DMAC_WFE(tch, rev);
 519 +               if (lc1)
 520 +                        DMAC_DMALP(tch, 1, lc1);
 521 +                DMAC_DMALP(tch, 0, lc0);
 522 +                DMAC_WFE(tch, rev);
 523 +                DMAC_DMALDS(tch);
 524 +                DMAC_DMASTS(tch);
 525 +                DMAC_DMAWMB(tch);
 526 +                DMAC_DMASEV(tch, tev);
 527 +                DMAC_DMALPEND(tch, 0,
 528 +                              DMAWFE_INSTR_SIZE + DMASEV_INSTR_SIZE +
 529 +                              DMAWMB_INSTR_SIZE + DMAST_INSTR_SIZE +
 530 +                              DMALD_INSTR_SIZE, 1);
 531 +                if (lc1)
 532 +                        DMAC_DMALPEND(tch, 1,
 533 +                                      DMALP_INSTR_SIZE + DMALPEND_INSTR_SIZE +
 534 +                                      DMAWFE_INSTR_SIZE + DMASEV_INSTR_SIZE +
 535 +                                      DMAWMB_INSTR_SIZE + DMAST_INSTR_SIZE +
 536 +                                      DMALD_INSTR_SIZE, 1);
 537 +
 538 +               if (rump) {
 539 +                        DMAC_DMALP(tch, 0, rump);
 540 +                        DMAC_WFE(tch, rev);
 541 +                        DMAC_DMALDS(tch);
 542 +                        DMAC_DMASTS(tch);
 543 +                        DMAC_DMAWMB(tch);
 544 +                        DMAC_DMASEV(tch, tev);
 545 +                        DMAC_DMALPEND(tch, 0,
 546 +                                      DMAWFE_INSTR_SIZE + DMASEV_INSTR_SIZE +
 547 +                                      DMAWMB_INSTR_SIZE + DMAST_INSTR_SIZE +
 548 +                                      DMALD_INSTR_SIZE, 1);
 549 +                }
 550 +
 551 +
 552 +               DMAC_DMAEND(tch);
 553 +               DMAC_DMAGO(tch);
 554 +       }
 555 +       {
 556 +               DMAC_DMAMOV(rch, SAR, SPI_RECEIVE_BUFFER_REG_ADDR);
 557 +               DMAC_DMAMOV(rch, DAR, rdma);
 558 +               DMAC_DMAMOV(rch, CCR,
 559 +                           dmac_create_ctrlval(0, 1, 1, rx_inc, 1, 1, 0));
 560 +
 561 +                if (lc1)
 562 +                        DMAC_DMALP(rch, 1, lc1);
 563 +                DMAC_DMALP(rch, 0, lc0);
 564 +                DMAC_DMAWFP(rch, DMAC_SPI_PERIPH_ID, PERIPHERAL);
 565 +                DMAC_DMALDP(rch, DMAC_SPI_PERIPH_ID, 0);
 566 +                DMAC_DMASTS(rch);
 567 +                DMAC_DMAWMB(rch);
 568 +                DMAC_DMASEV(rch, rev);
 569 +                DMAC_WFE(rch, tev);
 570 +                DMAC_DMALPEND(rch, 0,
 571 +                              DMAWFE_INSTR_SIZE + DMASEV_INSTR_SIZE +
 572 +                              DMAWMB_INSTR_SIZE + DMAST_INSTR_SIZE +
 573 +                              DMALDP_INSTR_SIZE + DMAWFP_INSTR_SIZE, 1);
 574 +                if (lc1)
 575 +                        DMAC_DMALPEND(rch, 1,
 576 +                                      DMAWFE_INSTR_SIZE +
 577 +                                      DMASEV_INSTR_SIZE + DMAWMB_INSTR_SIZE +
 578 +                                      DMAST_INSTR_SIZE + DMALDP_INSTR_SIZE +
 579 +                                      DMAWFP_INSTR_SIZE + DMALP_INSTR_SIZE +
 580 +                                      DMALPEND_INSTR_SIZE, 1);
 581 +
 582 +
 583 +                if (rump) {
 584 +                        DMAC_DMALP(rch, 0, rump);
 585 +                        DMAC_DMAWFP(rch, DMAC_SPI_PERIPH_ID, PERIPHERAL);
 586 +                        DMAC_DMALDP(rch, DMAC_SPI_PERIPH_ID, 0);
 587 +                        DMAC_DMASTS(rch);
 588 +                        DMAC_DMAWMB(rch);
 589 +                        DMAC_DMASEV(rch, rev);
 590 +                        DMAC_WFE(rch, tev);
 591 +                        DMAC_DMALPEND(rch, 0,
 592 +                                      DMAWFE_INSTR_SIZE +
 593 +                                      DMASEV_INSTR_SIZE + DMAWMB_INSTR_SIZE +
 594 +                                      DMAST_INSTR_SIZE + DMALDP_INSTR_SIZE +
 595 +                                      DMAWFP_INSTR_SIZE, 1);
 596 +                }
 597 +                // extra RX
 598 +               DMAC_DMAWFP(rch, DMAC_SPI_PERIPH_ID, PERIPHERAL);
 599 +                DMAC_DMALDP(rch, DMAC_SPI_PERIPH_ID, 0);
 600 +                DMAC_DMASTS(rch);
 601 +                DMAC_DMAWMB(rch);
 602 +
 603 +               DMAC_DMAFLUSHP(rch, DMAC_SPI_PERIPH_ID);
 604 +                DMAC_DMASEV(rch, rch);  // This will generate an interrupt
 605 +               DMAC_DMAEND(rch);
 606 +               DMAC_DMAGO(rch);
 607 +       }
 608 +       return 0;
 609 +}
 610 +
 611 +static void cns3xxx_spi_dma_uninitialize(int rch, int tch, int revt, int tevt)
 612 +{
 613 +       dmac_release_event(rch, revt);
 614 +       dmac_release_event(tch, tevt);
 615 +       dmac_release_channel(rch);
 616 +       dmac_release_channel(tch);
 617 +       return;
 618 +}
 619 +
 620 +#endif /* CONFIG_SPI_CNS3XXX_USEDMA */
 621 +
 622 +static int cns3xxx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
 623 +{
 624 +       struct cns3xxx_spi *hw = to_hw(spi);
 625 +#ifdef CONFIG_SPI_CNS3XXX_USEDMA
 626 +       int spi_rxchan, spi_txchan, spi_rxevt, spi_txevt;
 627 +       int rx_data;
 628 +#endif
 629 +       dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf,
 630 +               t->len);
 631 +
 632 +       hw->tx = t->tx_buf;
 633 +       hw->rx = t->rx_buf;
 634 +       hw->len = t->len;
 635 +       hw->count = 0;
 636 +       hw->last_in_message_list = t->last_in_message_list;
 637 +
 638 +#ifdef CONFIG_SPI_CNS3XXX_USEDMA
 639 +       init_completion(&hw->done);
 640 +
 641 +       if (cns3xxx_spi_dma_initialize
 642 +           (&spi_rxchan, &spi_txchan, &spi_rxevt, &spi_txevt, hw)) {
 643 +               dev_dbg(&spi->dev, "%s:%d Could not initialize DMA. \n",
 644 +                       __FUNCTION__, __LINE__);
 645 +               return 0;
 646 +       }
 647 +
 648 +       if (t->tx_buf)
 649 +               t->tx_dma =
 650 +                   dma_map_single(NULL, t->tx_buf, t->len, DMA_TO_DEVICE);
 651 +       if (t->rx_buf)
 652 +               t->rx_dma =
 653 +                   dma_map_single(NULL, t->rx_buf, t->len, DMA_FROM_DEVICE);
 654 +
 655 +       if (cns3xxx_spi_start_dma
 656 +           (spi_rxchan, spi_txchan, spi_rxevt, spi_txevt, t, hw)) {
 657 +               dev_dbg(&spi->dev, "Could not start DMA. \n");
 658 +               if (t->tx_buf)
 659 +                       dma_unmap_single(NULL, t->tx_dma, t->len,
 660 +                                        DMA_TO_DEVICE);
 661 +               t->tx_dma = 0;
 662 +               if (t->rx_buf)
 663 +                       dma_unmap_single(NULL, t->rx_dma, t->len,
 664 +                                        DMA_FROM_DEVICE);
 665 +               t->rx_dma = 0;
 666 +               cns3xxx_spi_dma_uninitialize(spi_rxchan, spi_txchan, spi_rxevt,
 667 +                                            spi_txevt);
 668 +               return 0;
 669 +       }
 670 +
 671 +       wait_for_completion(&hw->done);
 672 +
 673 +       dev_dbg(&spi->dev, "DMA reported completion of transfer of %d bytes\n",
 674 +               t->len - 1);
 675 +
 676 +       if (t->tx_buf)
 677 +               dma_unmap_single(NULL, t->tx_dma, t->len, DMA_TO_DEVICE);
 678 +       t->tx_dma = 0;
 679 +       if (t->rx_buf)
 680 +               dma_unmap_single(NULL, t->rx_dma, t->len, DMA_FROM_DEVICE);
 681 +       t->rx_dma = 0;
 682 +       cns3xxx_spi_dma_uninitialize(spi_rxchan, spi_txchan, spi_rxevt,
 683 +                                    spi_txevt);
 684 +
 685 +       if (t->last_in_message_list)
 686 +               cns3xxx_spi_tx_rx(spi->chip_select, 1,
 687 +                                 (hw->tx) ? hw->tx[hw->len - 1] : 0xff,
 688 +                                 &rx_data);
 689 +       else
 690 +               cns3xxx_spi_tx_rx(spi->chip_select, 0,
 691 +                                 (hw->tx) ? hw->tx[hw->len - 1] : 0xff,
 692 +                                 &rx_data);
 693 +
 694 +       if (hw->rx)
 695 +               hw->rx[hw->len - 1] = rx_data & 0xff;
 696 +
 697 +       return hw->len;
 698 +
 699 +#else /* !CONFIG_SPI_CNS3XXX_USEDMA */
 700 +
 701 +#ifdef CNS3XXX_SPI_INTERRUPT
 702 +
 703 +       init_completion(&hw->done);
 704 +
 705 +       /* Effectively, we are enabling only the Receive Buffer Interrupt Enable */
 706 +       /* TX Buf Underrun and RX Buf Overrun are not to happen */
 707 +       SPI_INTERRUPT_ENABLE_REG = (0x1 << 2);
 708 +//         (0x0) | (0x1 << 2) | (0x0 << 3) | (0x1 << 6) | (0x1 << 7);
 709 +
 710 +       /* Write data and wait for completion */
 711 +       SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
 712 +       SPI_TRANSMIT_CONTROL_REG |= (spi->chip_select & 0x3) |
 713 +           ((((hw->last_in_message_list) && (hw->len == 1)) ? 0x1 : 0x0) << 2);
 714 +
 715 +       SPI_TRANSMIT_BUFFER_REG = (hw->tx) ? hw->tx[hw->count] : 0xff;
 716 +
 717 +       wait_for_completion(&hw->done);
 718 +
 719 +       SPI_INTERRUPT_ENABLE_REG = 0;
 720 +
 721 +       return hw->count;
 722 +
 723 +#else /* !CNS3XXX_SPI_INTERRUPT */
 724 +
 725 +       init_completion(&hw->done);
 726 +
 727 +       if (hw->tx) {
 728 +               int i;
 729 +               u32 rx_data;
 730 +               for (i = 0; i < (hw->len - 1); i++) {
 731 +                       dev_dbg(&spi->dev,
 732 +                               "[SPI_CNS3XXX_DEBUG] hw->tx[%02d]: 0x%02x\n", i,
 733 +                               hw->tx[i]);
 734 +                       cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
 735 +                                         &rx_data);
 736 +                       if (hw->rx) {
 737 +                               hw->rx[i] = rx_data;
 738 +                               dev_dbg(&spi->dev,
 739 +                                       "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
 740 +                                       i, hw->rx[i]);
 741 +                       }
 742 +               }
 743 +
 744 +               if (t->last_in_message_list) {
 745 +                       cns3xxx_spi_tx_rx(spi->chip_select, 1, hw->tx[i],
 746 +                                         &rx_data);
 747 +                       if (hw->rx) {
 748 +                               hw->rx[i] = rx_data;
 749 +                               dev_dbg(&spi->dev,
 750 +                                       "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
 751 +                                       i, hw->rx[i]);
 752 +                       }
 753 +               } else {
 754 +                       cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
 755 +                                         &rx_data);
 756 +               }
 757 +               goto done;
 758 +       }
 759 +
 760 +       if (hw->rx) {
 761 +               int i;
 762 +               u32 rx_data;
 763 +               for (i = 0; i < (hw->len - 1); i++) {
 764 +                       cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
 765 +                       hw->rx[i] = rx_data;
 766 +                       dev_dbg(&spi->dev,
 767 +                               "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", i,
 768 +                               hw->rx[i]);
 769 +               }
 770 +
 771 +               if (t->last_in_message_list) {
 772 +                       cns3xxx_spi_tx_rx(spi->chip_select, 1, 0xff, &rx_data);
 773 +               } else {
 774 +                       cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
 775 +               }
 776 +               hw->rx[i] = rx_data;
 777 +               dev_dbg(&spi->dev, "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
 778 +                       i, hw->rx[i]);
 779 +       }
 780 +done:
 781 +       return hw->len;
 782 +
 783 +#endif /* CNS3XXX_SPI_INTERRUPT */
 784 +
 785 +#endif /* CONFIG_SPI_CNS3XXX_USEDMA */
 786 +}
 787 +
 788 +#ifdef CNS3XXX_SPI_INTERRUPT
 789 +/* Driver supports single master only.
 790 + * We have disabled fifo, so we wait for the receive buff full interrupt.
 791 + * Receive Buff overrun, transmit buff underrun are not to happen
 792 + */
 793 +static irqreturn_t cns3xxx_spi_irq(int irq, void *dev)
 794 +{
 795 +       struct cns3xxx_spi *hw = dev;
 796 +       uint32_t int_status;
 797 +       uint8_t data;
 798 +       unsigned int count = hw->count;
 799 +
 800 +       /* Read the interrupt status and clear interrupt */
 801 +       int_status = SPI_INTERRUPT_STATUS_REG;
 802 +
 803 +       if (!(int_status & (0x1 << 2))) {
 804 +               printk("DEBUG THIS ! Unexpected interrupt (status = 0x%x)", int_status);
 805 +               /* Clearing spurious interrupts */
 806 +               SPI_INTERRUPT_STATUS_REG = (0xF << 4);
 807 +               goto irq_done;
 808 +       }
 809 +
 810 +       /* Read to clear */
 811 +       data = SPI_RECEIVE_BUFFER_REG & 0xff;
 812 +
 813 +       if (hw->rx)
 814 +               hw->rx[hw->count] = data;
 815 +
 816 +       hw->count++;
 817 +       hw->len--;
 818 +
 819 +       if (hw->len) {
 820 +               SPI_TRANSMIT_CONTROL_REG |=
 821 +                   ((((hw->last_in_message_list) && (hw->len == 1)) ? 0x1 : 0x0) << 2);
 822 +               SPI_TRANSMIT_BUFFER_REG = (hw->tx) ? hw->tx[hw->count] : 0xff;
 823 +       } else {
 824 +               complete(&hw->done);
 825 +       }
 826 +
 827 +irq_done:
 828 +       return IRQ_HANDLED;
 829 +}
 830 +#endif
 831 +
 832 +static void __init cns3xxx_spi_initial(void)
 833 +{
 834 +
 835 +       /* share pin config. */
 836 +#if 1
 837 +#if 0
 838 +       /* GPIOB18 is set to PCM by default */
 839 +    MISC_GPIOB_PIN_ENABLE_REG &= ~(MISC_GSW_P0_CRS_PIN);
 840 +    gpio_direction_output(50, 1);
 841 +#endif
 842 +       PM_PLL_HM_PD_CTRL_REG &= ~(0x1 << 5);
 843 +       HAL_MISC_ENABLE_SPI_PINS();
 844 +       HAL_MISC_ENABLE_PCM_PINS(); /* this just for PCM test */
 845 +       cns3xxx_pwr_clk_en(CNS3XXX_PWR_CLK_EN(SPI_PCM_I2C));
 846 +       cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(SPI_PCM_I2C));
 847 +#endif
 848 +
 849 +       SPI_CONFIGURATION_REG = (((0x0 & 0x3) << 0) |   /* 8bits shift length */
 850 +                                (0x0 << 9) |   /* SPI mode */
 851 +                                (0x0 << 10) |  /* disable FIFO */
 852 +                                (0x1 << 11) |  /* SPI master mode */
 853 +                                (0x0 << 12) |  /* disable SPI loopback mode */
 854 +                                (0x1 << 13) |  /* clock phase */
 855 +                                (0x1 << 14) |  /* clock polarity */
 856 +                                (0x0 << 24) |  /* disable - SPI data swap */
 857 +#ifdef CONFIG_SPI_CNS3XXX_2IOREAD
 858 +                                (0x1 << 29) |  /* enable - 2IO Read mode */
 859 +#else
 860 +                                (0x0 << 29) |  /* disablea - 2IO Read mode */
 861 +#endif
 862 +                                (0x0 << 30) |  /* disable - SPI high speed read for system boot up */
 863 +                                (0x0 << 31));  /* disable - SPI */
 864 +
 865 +       /* Set SPI bit rate PCLK/2 */
 866 +       SPI_BIT_RATE_CONTROL_REG = 0x1;
 867 +
 868 +       /* Set SPI Tx channel 0 */
 869 +       SPI_TRANSMIT_CONTROL_REG = 0x0;
 870 +
 871 +       /* Set Tx FIFO Threshold, Tx FIFO has 2 words */
 872 +       SPI_FIFO_TRANSMIT_CONFIG_REG &= ~(0x03 << 4);
 873 +       SPI_FIFO_TRANSMIT_CONFIG_REG |= ((0x0 & 0x03) << 4);
 874 +
 875 +       /* Set Rx FIFO Threshold, Rx FIFO has 2 words */
 876 +       SPI_FIFO_RECEIVE_CONFIG_REG &= ~(0x03 << 4);
 877 +       SPI_FIFO_RECEIVE_CONFIG_REG |= ((0x0 & 0x03) << 4);
 878 +
 879 +       /* Disable all interrupt */
 880 +       SPI_INTERRUPT_ENABLE_REG = 0x0;
 881 +
 882 +       /* Clear spurious interrupt sources */
 883 +       SPI_INTERRUPT_STATUS_REG = (0x0F << 4);
 884 +
 885 +       /* Enable SPI */
 886 +       SPI_CONFIGURATION_REG |= (0x1 << 31);
 887 +
 888 +       return;
 889 +}
 890 +
 891 +static int __init cns3xxx_spi_probe(struct platform_device *pdev)
 892 +{
 893 +       struct spi_master *master;
 894 +       struct cns3xxx_spi *hw;
 895 +       int err = 0;
 896 +
 897 +       printk("%s: setup CNS3XXX SPI Controller", __FUNCTION__);
 898 +#ifdef CONFIG_SPI_CNS3XXX_USEDMA
 899 +       printk(" w/ DMA \n");
 900 +#else
 901 +#ifdef CNS3XXX_SPI_INTERRUPT
 902 +       printk(" in Interrupt mode, w/o DMA \n");
 903 +#else
 904 +       printk(" in polling mode, w/o DMA \n");
 905 +#endif
 906 +#endif
 907 +
 908 +       /* share pin config. */
 909 +//     HAL_MISC_ENABLE_SPI_PINS();
 910 +
 911 +       /* Allocate master with space for cns3xxx_spi */
 912 +       master = spi_alloc_master(&pdev->dev, sizeof(struct cns3xxx_spi));
 913 +       if (master == NULL) {
 914 +               dev_err(&pdev->dev, "No memory for spi_master\n");
 915 +               err = -ENOMEM;
 916 +               goto err_nomem;
 917 +       }
 918 +
 919 +       hw = spi_master_get_devdata(master);
 920 +       memset(hw, 0, sizeof(struct cns3xxx_spi));
 921 +
 922 +       hw->master = spi_master_get(master);
 923 +       hw->dev = &pdev->dev;
 924 +
 925 +       platform_set_drvdata(pdev, hw);
 926 +       init_completion(&hw->done);
 927 +
 928 +       /* setup the master state. */
 929 +
 930 +       master->num_chipselect = 4;
 931 +       master->bus_num = 1;
 932 +
 933 +       /* setup the state for the bitbang driver */
 934 +
 935 +       hw->bitbang.master = hw->master;
 936 +       hw->bitbang.setup_transfer = cns3xxx_spi_setup_transfer;
 937 +       hw->bitbang.chipselect = cns3xxx_spi_chipselect;
 938 +       hw->bitbang.txrx_bufs = cns3xxx_spi_txrx;
 939 +       hw->bitbang.master->setup = cns3xxx_spi_setup;
 940 +
 941 +       dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
 942 +
 943 +#ifdef CNS3XXX_SPI_INTERRUPT
 944 +       err = request_irq(IRQ_CNS3XXX_SPI, cns3xxx_spi_irq, IRQF_SHARED, "cns3xxx_spi", hw);
 945 +       if (err) {
 946 +               dev_err(&pdev->dev, "Cannot claim IRQ\n");
 947 +               goto err_no_irq;
 948 +       }
 949 +#endif
 950 +
 951 +       /* SPI controller initializations */
 952 +       cns3xxx_spi_initial();
 953 +
 954 +       /* register SPI controller */
 955 +
 956 +       err = spi_bitbang_start(&hw->bitbang);
 957 +       if (err) {
 958 +               dev_err(&pdev->dev, "Failed to register SPI master\n");
 959 +               goto err_register;
 960 +       }
 961 +
 962 +       spi_slave_probe();
 963 +
 964 +       return 0;
 965 +
 966 +err_register:
 967 +#ifdef CNS3XXX_SPI_INTERRUPT
 968 +err_no_irq:
 969 +#endif
 970 +       spi_master_put(hw->master);;
 971 +
 972 +err_nomem:
 973 +       return err;
 974 +}
 975 +
 976 +static int __devexit cns3xxx_spi_remove(struct platform_device *dev)
 977 +{
 978 +       struct cns3xxx_spi *hw = platform_get_drvdata(dev);
 979 +
 980 +       platform_set_drvdata(dev, NULL);
 981 +
 982 +       spi_unregister_master(hw->master);
 983 +
 984 +       //cns3xxx_spi_clk_disable();
 985 +
 986 +       spi_master_put(hw->master);
 987 +       return 0;
 988 +}
 989 +
 990 +#ifdef CONFIG_PM
 991 +
 992 +static int cns3xxx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
 993 +{
 994 +       struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
 995 +
 996 +       //cns3xxx_spi_clk_disable();
 997 +       return 0;
 998 +}
 999 +
1000 +static int cns3xxx_spi_resume(struct platform_device *pdev)
1001 +{
1002 +       struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
1003 +
1004 +       //cns3xxx_spi_clk_enable()
1005 +       return 0;
1006 +}
1007 +
1008 +#else
1009 +#define cns3xxx_spi_suspend    NULL
1010 +#define cns3xxx_spi_resume     NULL
1011 +#endif
1012 +
1013 +static struct platform_driver cns3xxx_spi_driver = {
1014 +       .probe          = cns3xxx_spi_probe,
1015 +       .remove         = __devexit_p(cns3xxx_spi_remove),
1016 +       .suspend        = cns3xxx_spi_suspend,
1017 +       .resume         = cns3xxx_spi_resume,
1018 +       .driver         = {
1019 +               .name = "cns3xxx_spi",
1020 +               .owner = THIS_MODULE,
1021 +       },
1022 +};
1023 +
1024 +static int __init cns3xxx_spi_init(void)
1025 +{
1026 +       return platform_driver_register(&cns3xxx_spi_driver);
1027 +}
1028 +
1029 +static void __exit cns3xxx_spi_exit(void)
1030 +{
1031 +       platform_driver_unregister(&cns3xxx_spi_driver);
1032 +}
1033 +
1034 +module_init(cns3xxx_spi_init);
1035 +module_exit(cns3xxx_spi_exit);
1036 +
1037 +MODULE_AUTHOR("Cavium Networks");
1038 +MODULE_DESCRIPTION("CNS3XXX SPI Controller Driver");
1039 +MODULE_LICENSE("GPL");
1040 +MODULE_ALIAS("platform:cns3xxx_spi");
1041 +
1042 +EXPORT_SYMBOL_GPL(cns3xxx_spi_tx_rx);
1043 --- a/include/linux/spi/spi.h
1044 +++ b/include/linux/spi/spi.h
1045 @@ -424,6 +424,12 @@ struct spi_transfer {
1046         u16             delay_usecs;
1047         u32             speed_hz;
1048
1049 +#ifdef CONFIG_ARCH_CNS3XXX
1050 +    unsigned    last_in_message_list;
1051 +#ifdef CONFIG_SPI_CNS3XXX_2IOREAD
1052 +    u8          dio_read;
1053 +#endif
1054 +#endif
1055         struct list_head transfer_list;
1056  };
1057
1058 @@ -627,6 +633,13 @@ spi_read(struct spi_device *spi, u8 *buf
1059         return spi_sync(spi, &m);
1060  }
1061
1062 +#ifdef CONFIG_ARCH_CNS3XXX
1063 +extern int spi_write_read_sync(struct spi_device *spi,
1064 +               const u8 *txbuf, unsigned n_tx,
1065 +               u8 *rxbuf, unsigned n_rx);
1066 +
1067 +#endif
1068 +
1069  /* this copies txbuf and rxbuf data; for small transfers only! */
1070  extern int spi_write_then_read(struct spi_device *spi,
1071                 const u8 *txbuf, unsigned n_tx,