drivers/staging/wilc1000/linux_wlan_spi.c

   1 #include <linux/module.h>
   2 #include <linux/init.h>
   3 #include <linux/kernel.h>
   4 #include <linux/fs.h>
   5 #include <linux/slab.h>
   6 #include <linux/types.h>
   7 #include <linux/cdev.h>
   8 #include <asm/uaccess.h>
   9 #include <linux/device.h>
  10 #include <linux/spi/spi.h>
  11
  12 #include "linux_wlan_common.h"
  13
  14 #define USE_SPI_DMA     0       /* johnny add */
  15
  16 #ifdef WILC_ASIC_A0
  17  #if defined(PLAT_PANDA_ES_OMAP4460)
  18   #define MIN_SPEED 12000000
  19   #define MAX_SPEED 24000000
  20  #elif defined(PLAT_WMS8304)
  21   #define MIN_SPEED 12000000
  22   #define MAX_SPEED 24000000 /* 4000000 */
  23  #elif defined(CUSTOMER_PLATFORM)
  24 /*
  25   TODO : define Clock speed under 48M.
  26  *
  27  * ex)
  28  * #define MIN_SPEED 24000000
  29  * #define MAX_SPEED 48000000
  30  */
  31  #else
  32   #define MIN_SPEED 24000000
  33   #define MAX_SPEED 48000000
  34  #endif
  35 #else /* WILC_ASIC_A0 */
  36 /* Limit clk to 6MHz on FPGA. */
  37  #define MIN_SPEED 6000000
  38  #define MAX_SPEED 6000000
  39 #endif /* WILC_ASIC_A0 */
  40
  41 static uint32_t SPEED = MIN_SPEED;
  42
  43 struct spi_device *wilc_spi_dev;
  44 void linux_spi_deinit(void *vp);
  45
  46 static int __init wilc_bus_probe(struct spi_device *spi)
  47 {
  48
  49         PRINT_D(BUS_DBG, "spiModalias: %s\n", spi->modalias);
  50         PRINT_D(BUS_DBG, "spiMax-Speed: %d\n", spi->max_speed_hz);
  51         wilc_spi_dev = spi;
  52
  53         printk("Driver Initializing success\n");
  54         return 0;
  55 }
  56
  57 static int __exit wilc_bus_remove(struct spi_device *spi)
  58 {
  59
  60         return 0;
  61 }
  62
  63 #ifdef CONFIG_OF
  64 static const struct of_device_id wilc1000_of_match[] = {
  65         { .compatible = "atmel,wilc_spi", },
  66         {}
  67 };
  68 MODULE_DEVICE_TABLE(of, wilc1000_of_match);
  69 #endif
  70
  71 struct spi_driver wilc_bus __refdata = {
  72         .driver = {
  73                 .name = MODALIAS,
  74 #ifdef CONFIG_OF
  75                 .of_match_table = wilc1000_of_match,
  76 #endif
  77         },
  78         .probe =  wilc_bus_probe,
  79         .remove = __exit_p(wilc_bus_remove),
  80 };
  81
  82
  83 void linux_spi_deinit(void *vp)
  84 {
  85
  86         spi_unregister_driver(&wilc_bus);
  87
  88         SPEED = MIN_SPEED;
  89         PRINT_ER("@@@@@@@@@@@@ restore SPI speed to %d @@@@@@@@@\n", SPEED);
  90
  91 }
  92
  93
  94
  95 int linux_spi_init(void *vp)
  96 {
  97         int ret = 1;
  98         static int called;
  99
 100
 101         if (called == 0) {
 102                 called++;
 103                 ret = spi_register_driver(&wilc_bus);
 104         }
 105
 106         /* change return value to match WILC interface */
 107         (ret < 0) ? (ret = 0) : (ret = 1);
 108
 109         return ret;
 110 }
 111
 112 #if defined(PLAT_WMS8304)
 113 #define TXRX_PHASE_SIZE (4096)
 114 #endif
 115
 116 #if defined (NM73131_0_BOARD)
 117
 118 int linux_spi_write(uint8_t *b, uint32_t len)
 119 {
 120
 121         int ret;
 122
 123         if (len > 0 && b != NULL) {
 124                 struct spi_message msg;
 125                 PRINT_D(BUS_DBG, "Request writing %d bytes\n", len);
 126                 struct spi_transfer tr = {
 127                         .tx_buf = b,
 128                         .len = len,
 129                         .speed_hz = SPEED,
 130                         .delay_usecs = 0,
 131                 };
 132
 133                 spi_message_init(&msg);
 134                 spi_message_add_tail(&tr, &msg);
 135                 ret = spi_sync(wilc_spi_dev, &msg);
 136                 if (ret < 0) {
 137                         PRINT_ER("SPI transaction failed\n");
 138                 }
 139
 140         } else {
 141                 PRINT_ER("can't write data with the following length: %d\n", len);
 142                 PRINT_ER("FAILED due to NULL buffer or ZERO length check the following length: %d\n", len);
 143                 ret = -1;
 144         }
 145
 146         /* change return value to match WILC interface */
 147         (ret < 0) ? (ret = 0) : (ret = 1);
 148
 149
 150         return ret;
 151 }
 152
 153 #elif defined(TXRX_PHASE_SIZE)
 154
 155 int linux_spi_write(uint8_t *b, uint32_t len)
 156 {
 157         int ret;
 158         if (len > 0 && b != NULL) {
 159                 int i = 0;
 160                 int blk = len / TXRX_PHASE_SIZE;
 161                 int remainder = len % TXRX_PHASE_SIZE;
 162
 163                 char *r_buffer = kzalloc(TXRX_PHASE_SIZE, GFP_KERNEL);
 164                 if (!r_buffer) {
 165                         PRINT_ER("Failed to allocate memory for r_buffer\n");
 166                 }
 167
 168                 if (blk) {
 169                         while (i < blk) {
 170                                 struct spi_message msg;
 171                                 struct spi_transfer tr = {
 172                                         .tx_buf = b + (i * TXRX_PHASE_SIZE),
 173                                         .len = TXRX_PHASE_SIZE,
 174                                         .speed_hz = SPEED,
 175                                         .bits_per_word = 8,
 176                                         .delay_usecs = 0,
 177                                 };
 178
 179                                 tr.rx_buf = r_buffer;
 180
 181                                 memset(&msg, 0, sizeof(msg));
 182                                 spi_message_init(&msg);
 183                                 msg.spi = wilc_spi_dev;
 184                                 msg.is_dma_mapped = USE_SPI_DMA;
 185
 186                                 spi_message_add_tail(&tr, &msg);
 187                                 ret = spi_sync(wilc_spi_dev, &msg);
 188                                 if (ret < 0) {
 189                                         PRINT_ER("SPI transaction failed\n");
 190                                 }
 191                                 i++;
 192
 193                         }
 194                 }
 195                 if (remainder) {
 196                         struct spi_message msg;
 197                         struct spi_transfer tr = {
 198                                 .tx_buf = b + (blk * TXRX_PHASE_SIZE),
 199                                 .len = remainder,
 200                                 .speed_hz = SPEED,
 201                                 .bits_per_word = 8,
 202                                 .delay_usecs = 0,
 203                         };
 204                         tr.rx_buf = r_buffer;
 205
 206                         memset(&msg, 0, sizeof(msg));
 207                         spi_message_init(&msg);
 208                         msg.spi = wilc_spi_dev;
 209                         msg.is_dma_mapped = USE_SPI_DMA;                                /* rachel */
 210
 211                         spi_message_add_tail(&tr, &msg);
 212                         ret = spi_sync(wilc_spi_dev, &msg);
 213                         if (ret < 0) {
 214                                 PRINT_ER("SPI transaction failed\n");
 215                         }
 216                 }
 217                 kfree(r_buffer);
 218         } else {
 219                 PRINT_ER("can't write data with the following length: %d\n", len);
 220                 PRINT_ER("FAILED due to NULL buffer or ZERO length check the following length: %d\n", len);
 221                 ret = -1;
 222         }
 223
 224         /* change return value to match WILC interface */
 225         (ret < 0) ? (ret = 0) : (ret = 1);
 226
 227         return ret;
 228
 229 }
 230
 231 #else
 232 int linux_spi_write(uint8_t *b, uint32_t len)
 233 {
 234
 235         int ret;
 236         struct spi_message msg;
 237
 238         if (len > 0 && b != NULL) {
 239                 struct spi_transfer tr = {
 240                         .tx_buf = b,
 241                         .len = len,
 242                         .speed_hz = SPEED,
 243                         .delay_usecs = 0,
 244                 };
 245                 char *r_buffer = kzalloc(len, GFP_KERNEL);
 246                 if (!r_buffer) {
 247                         PRINT_ER("Failed to allocate memory for r_buffer\n");
 248                 }
 249                 tr.rx_buf = r_buffer;
 250                 PRINT_D(BUS_DBG, "Request writing %d bytes\n", len);
 251
 252                 memset(&msg, 0, sizeof(msg));
 253                 spi_message_init(&msg);
 254 /* [[johnny add */
 255                 msg.spi = wilc_spi_dev;
 256                 msg.is_dma_mapped = USE_SPI_DMA;
 257 /* ]] */
 258                 spi_message_add_tail(&tr, &msg);
 259
 260                 ret = spi_sync(wilc_spi_dev, &msg);
 261                 if (ret < 0) {
 262                         PRINT_ER("SPI transaction failed\n");
 263                 }
 264
 265                 kfree(r_buffer);
 266         } else {
 267                 PRINT_ER("can't write data with the following length: %d\n", len);
 268                 PRINT_ER("FAILED due to NULL buffer or ZERO length check the following length: %d\n", len);
 269                 ret = -1;
 270         }
 271
 272         /* change return value to match WILC interface */
 273         (ret < 0) ? (ret = 0) : (ret = 1);
 274
 275
 276         return ret;
 277 }
 278
 279 #endif
 280
 281 #if defined (NM73131_0_BOARD)
 282
 283 int linux_spi_read(unsigned char *rb, unsigned long rlen)
 284 {
 285
 286         int ret;
 287
 288         if (rlen > 0) {
 289                 struct spi_message msg;
 290                 struct spi_transfer tr = {
 291                         .rx_buf = rb,
 292                         .len = rlen,
 293                         .speed_hz = SPEED,
 294                         .delay_usecs = 0,
 295
 296                 };
 297
 298                 spi_message_init(&msg);
 299                 spi_message_add_tail(&tr, &msg);
 300                 ret = spi_sync(wilc_spi_dev, &msg);
 301                 if (ret < 0) {
 302                         PRINT_ER("SPI transaction failed\n");
 303                 }
 304         } else {
 305                 PRINT_ER("can't read data with the following length: %ld\n", rlen);
 306                 ret = -1;
 307         }
 308         /* change return value to match WILC interface */
 309         (ret < 0) ? (ret = 0) : (ret = 1);
 310
 311         return ret;
 312 }
 313
 314 #elif defined(TXRX_PHASE_SIZE)
 315
 316 int linux_spi_read(unsigned char *rb, unsigned long rlen)
 317 {
 318         int ret;
 319
 320         if (rlen > 0) {
 321                 int i = 0;
 322
 323                 int blk = rlen / TXRX_PHASE_SIZE;
 324                 int remainder = rlen % TXRX_PHASE_SIZE;
 325
 326                 char *t_buffer = kzalloc(TXRX_PHASE_SIZE, GFP_KERNEL);
 327                 if (!t_buffer) {
 328                         PRINT_ER("Failed to allocate memory for t_buffer\n");
 329                 }
 330
 331                 if (blk) {
 332                         while (i < blk) {
 333                                 struct spi_message msg;
 334                                 struct spi_transfer tr = {
 335                                         .rx_buf = rb + (i * TXRX_PHASE_SIZE),
 336                                         .len = TXRX_PHASE_SIZE,
 337                                         .speed_hz = SPEED,
 338                                         .bits_per_word = 8,
 339                                         .delay_usecs = 0,
 340                                 };
 341                                 tr.tx_buf = t_buffer;
 342
 343                                 memset(&msg, 0, sizeof(msg));
 344                                 spi_message_init(&msg);
 345                                 msg.spi = wilc_spi_dev;
 346                                 msg.is_dma_mapped = USE_SPI_DMA;
 347
 348                                 spi_message_add_tail(&tr, &msg);
 349                                 ret = spi_sync(wilc_spi_dev, &msg);
 350                                 if (ret < 0) {
 351                                         PRINT_ER("SPI transaction failed\n");
 352                                 }
 353                                 i++;
 354                         }
 355                 }
 356                 if (remainder) {
 357                         struct spi_message msg;
 358                         struct spi_transfer tr = {
 359                                 .rx_buf = rb + (blk * TXRX_PHASE_SIZE),
 360                                 .len = remainder,
 361                                 .speed_hz = SPEED,
 362                                 .bits_per_word = 8,
 363                                 .delay_usecs = 0,
 364                         };
 365                         tr.tx_buf = t_buffer;
 366
 367                         memset(&msg, 0, sizeof(msg));
 368                         spi_message_init(&msg);
 369                         msg.spi = wilc_spi_dev;
 370                         msg.is_dma_mapped = USE_SPI_DMA;                                /* rachel */
 371
 372                         spi_message_add_tail(&tr, &msg);
 373                         ret = spi_sync(wilc_spi_dev, &msg);
 374                         if (ret < 0) {
 375                                 PRINT_ER("SPI transaction failed\n");
 376                         }
 377                 }
 378
 379                 kfree(t_buffer);
 380         } else {
 381                 PRINT_ER("can't read data with the following length: %ld\n", rlen);
 382                 ret = -1;
 383         }
 384         /* change return value to match WILC interface */
 385         (ret < 0) ? (ret = 0) : (ret = 1);
 386
 387         return ret;
 388 }
 389
 390 #else
 391 int linux_spi_read(unsigned char *rb, unsigned long rlen)
 392 {
 393
 394         int ret;
 395
 396         if (rlen > 0) {
 397                 struct spi_message msg;
 398                 struct spi_transfer tr = {
 399                         .rx_buf = rb,
 400                         .len = rlen,
 401                         .speed_hz = SPEED,
 402                         .delay_usecs = 0,
 403
 404                 };
 405                 char *t_buffer = kzalloc(rlen, GFP_KERNEL);
 406                 if (!t_buffer) {
 407                         PRINT_ER("Failed to allocate memory for t_buffer\n");
 408                 }
 409                 tr.tx_buf = t_buffer;
 410
 411                 memset(&msg, 0, sizeof(msg));
 412                 spi_message_init(&msg);
 413 /* [[ johnny add */
 414                 msg.spi = wilc_spi_dev;
 415                 msg.is_dma_mapped = USE_SPI_DMA;
 416 /* ]] */
 417                 spi_message_add_tail(&tr, &msg);
 418
 419                 ret = spi_sync(wilc_spi_dev, &msg);
 420                 if (ret < 0) {
 421                         PRINT_ER("SPI transaction failed\n");
 422                 }
 423                 kfree(t_buffer);
 424         } else {
 425                 PRINT_ER("can't read data with the following length: %ld\n", rlen);
 426                 ret = -1;
 427         }
 428         /* change return value to match WILC interface */
 429         (ret < 0) ? (ret = 0) : (ret = 1);
 430
 431         return ret;
 432 }
 433
 434 #endif
 435
 436 int linux_spi_write_read(unsigned char *wb, unsigned char *rb, unsigned int rlen)
 437 {
 438
 439         int ret;
 440
 441         if (rlen > 0) {
 442                 struct spi_message msg;
 443                 struct spi_transfer tr = {
 444                         .rx_buf = rb,
 445                         .tx_buf = wb,
 446                         .len = rlen,
 447                         .speed_hz = SPEED,
 448                         .bits_per_word = 8,
 449                         .delay_usecs = 0,
 450
 451                 };
 452
 453                 memset(&msg, 0, sizeof(msg));
 454                 spi_message_init(&msg);
 455                 msg.spi = wilc_spi_dev;
 456                 msg.is_dma_mapped = USE_SPI_DMA;
 457
 458                 spi_message_add_tail(&tr, &msg);
 459                 ret = spi_sync(wilc_spi_dev, &msg);
 460                 if (ret < 0) {
 461                         PRINT_ER("SPI transaction failed\n");
 462                 }
 463         } else {
 464                 PRINT_ER("can't read data with the following length: %d\n", rlen);
 465                 ret = -1;
 466         }
 467         /* change return value to match WILC interface */
 468         (ret < 0) ? (ret = 0) : (ret = 1);
 469
 470         return ret;
 471 }
 472
 473 int linux_spi_set_max_speed(void)
 474 {
 475         SPEED = MAX_SPEED;
 476
 477         PRINT_INFO(BUS_DBG, "@@@@@@@@@@@@ change SPI speed to %d @@@@@@@@@\n", SPEED);
 478         return 1;
 479 }