target/linux/cns3xxx/patches/052-cns3xxx_spi.patch

   1 --- a/drivers/spi/Kconfig
   2 +++ b/drivers/spi/Kconfig
   3 @@ -117,6 +117,13 @@ config SPI_BUTTERFLY
   4           inexpensive battery powered microcontroller evaluation board.
   5           This same cable can be used to flash new firmware.
   6
   7 +config SPI_CNS3XXX
   8 +       tristate "CNS3XXX SPI controller"
   9 +       depends on ARCH_CNS3XXX && SPI_MASTER
  10 +       select SPI_BITBANG
  11 +       help
  12 +         This enables using the CNS3XXX SPI controller in master mode.
  13 +
  14  config SPI_COLDFIRE_QSPI
  15         tristate "Freescale Coldfire QSPI controller"
  16         depends on (M520x || M523x || M5249 || M527x || M528x || M532x)
  17 --- a/drivers/spi/Makefile
  18 +++ b/drivers/spi/Makefile
  19 @@ -18,6 +18,7 @@ obj-$(CONFIG_SPI_BFIN)                        += spi-bfin5xx.
  20  obj-$(CONFIG_SPI_BFIN_SPORT)           += spi-bfin-sport.o
  21  obj-$(CONFIG_SPI_BITBANG)              += spi-bitbang.o
  22  obj-$(CONFIG_SPI_BUTTERFLY)            += spi-butterfly.o
  23 +obj-$(CONFIG_SPI_CNS3XXX)              += spi_cns3xxx.o
  24  obj-$(CONFIG_SPI_COLDFIRE_QSPI)                += spi-coldfire-qspi.o
  25  obj-$(CONFIG_SPI_DAVINCI)              += spi-davinci.o
  26  obj-$(CONFIG_SPI_DESIGNWARE)           += spi-dw.o
  27 --- /dev/null
  28 +++ b/drivers/spi/spi_cns3xxx.c
  29 @@ -0,0 +1,449 @@
  30 +/*******************************************************************************
  31 + *
  32 + *  CNS3XXX SPI controller driver (master mode only)
  33 + *
  34 + *  Copyright (c) 2008 Cavium Networks
  35 + *  Copyright 2011 Gateworks Corporation
  36 + *                Chris Lang <clang@gateworks.com>
  37 + *
  38 + *  This file is free software; you can redistribute it and/or modify
  39 + *  it under the terms of the GNU General Public License, Version 2, as
  40 + *  published by the Free Software Foundation.
  41 + *
  42 + *  This file is distributed in the hope that it will be useful,
  43 + *  but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
  44 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  45 + *  NONINFRINGEMENT.  See the GNU General Public License for more details.
  46 + *
  47 + *  You should have received a copy of the GNU General Public License
  48 + *  along with this file; if not, write to the Free Software
  49 + *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
  50 + *  visit http://www.gnu.org/licenses/.
  51 + *
  52 + *  This file may also be available under a different license from Cavium.
  53 + *  Contact Cavium Networks for more information
  54 + *
  55 + ******************************************************************************/
  56 +
  57 +#include <linux/init.h>
  58 +#include <linux/spinlock.h>
  59 +#include <linux/workqueue.h>
  60 +#include <linux/interrupt.h>
  61 +#include <linux/delay.h>
  62 +#include <linux/errno.h>
  63 +#include <linux/err.h>
  64 +#include <linux/clk.h>
  65 +#include <linux/platform_device.h>
  66 +
  67 +#include <linux/spi/spi.h>
  68 +#include <linux/spi/spi_bitbang.h>
  69 +#include <linux/mtd/partitions.h>
  70 +#include <linux/dma-mapping.h>
  71 +#include <linux/slab.h>
  72 +
  73 +#include <asm/io.h>
  74 +#include <asm/memory.h>
  75 +#include <asm/dma.h>
  76 +#include <asm/delay.h>
  77 +#include <mach/cns3xxx.h>
  78 +#include <linux/module.h>
  79 +#include <mach/pm.h>
  80 +
  81 +/*
  82 + * define access macros
  83 + */
  84 +#define SPI_MEM_MAP_VALUE(reg_offset)          (*((u32 volatile *)(CNS3XXX_SSP_BASE_VIRT + reg_offset)))
  85 +
  86 +#define SPI_CONFIGURATION_REG                  SPI_MEM_MAP_VALUE(0x40)
  87 +#define SPI_SERVICE_STATUS_REG                 SPI_MEM_MAP_VALUE(0x44)
  88 +#define SPI_BIT_RATE_CONTROL_REG               SPI_MEM_MAP_VALUE(0x48)
  89 +#define SPI_TRANSMIT_CONTROL_REG               SPI_MEM_MAP_VALUE(0x4C)
  90 +#define SPI_TRANSMIT_BUFFER_REG                        SPI_MEM_MAP_VALUE(0x50)
  91 +#define SPI_RECEIVE_CONTROL_REG                        SPI_MEM_MAP_VALUE(0x54)
  92 +#define SPI_RECEIVE_BUFFER_REG                 SPI_MEM_MAP_VALUE(0x58)
  93 +#define SPI_FIFO_TRANSMIT_CONFIG_REG           SPI_MEM_MAP_VALUE(0x5C)
  94 +#define SPI_FIFO_TRANSMIT_CONTROL_REG          SPI_MEM_MAP_VALUE(0x60)
  95 +#define SPI_FIFO_RECEIVE_CONFIG_REG            SPI_MEM_MAP_VALUE(0x64)
  96 +#define SPI_INTERRUPT_STATUS_REG               SPI_MEM_MAP_VALUE(0x68)
  97 +#define SPI_INTERRUPT_ENABLE_REG               SPI_MEM_MAP_VALUE(0x6C)
  98 +
  99 +#define SPI_TRANSMIT_BUFFER_REG_ADDR           (CNS3XXX_SSP_BASE +0x50)
 100 +#define SPI_RECEIVE_BUFFER_REG_ADDR            (CNS3XXX_SSP_BASE +0x58)
 101 +
 102 +/* Structure for SPI controller of CNS3XXX SOCs */
 103 +struct cns3xxx_spi {
 104 +       /* bitbang has to be first */
 105 +       struct spi_bitbang bitbang;
 106 +       struct completion done;
 107 +       wait_queue_head_t wait;
 108 +
 109 +       int len;
 110 +       int count;
 111 +       int last_in_message_list;
 112 +
 113 +       /* data buffers */
 114 +       const unsigned char *tx;
 115 +       unsigned char *rx;
 116 +
 117 +       struct spi_master *master;
 118 +       struct platform_device *pdev;
 119 +       struct device *dev;
 120 +};
 121 +
 122 +static inline u8 cns3xxx_spi_bus_idle(void)
 123 +{
 124 +       return ((SPI_SERVICE_STATUS_REG & 0x1) ? 0 : 1);
 125 +}
 126 +
 127 +static inline u8 cns3xxx_spi_tx_buffer_empty(void)
 128 +{
 129 +       return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 3)) ? 1 : 0);
 130 +}
 131 +
 132 +static inline u8 cns3xxx_spi_rx_buffer_full(void)
 133 +{
 134 +       return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 2)) ? 1 : 0);
 135 +}
 136 +
 137 +u8 cns3xxx_spi_tx_rx(u8 tx_channel, u8 tx_eof, u32 tx_data,
 138 +                           u32 * rx_data)
 139 +{
 140 +       u8 rx_channel;
 141 +       u8 rx_eof;
 142 +
 143 +       while (!cns3xxx_spi_bus_idle()) ;       // do nothing
 144 +
 145 +       while (!cns3xxx_spi_tx_buffer_empty()) ;        // do nothing
 146 +
 147 +       SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
 148 +       SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
 149 +
 150 +       SPI_TRANSMIT_BUFFER_REG = tx_data;
 151 +
 152 +       while (!cns3xxx_spi_rx_buffer_full()) ; // do nothing
 153 +
 154 +       rx_channel = SPI_RECEIVE_CONTROL_REG & 0x3;
 155 +       rx_eof = (SPI_RECEIVE_CONTROL_REG & (0x1 << 2)) ? 1 : 0;
 156 +
 157 +       *rx_data = SPI_RECEIVE_BUFFER_REG;
 158 +
 159 +       if ((tx_channel != rx_channel) || (tx_eof != rx_eof)) {
 160 +               return 0;
 161 +       } else {
 162 +               return 1;
 163 +       }
 164 +}
 165 +
 166 +u8 cns3xxx_spi_tx(u8 tx_channel, u8 tx_eof, u32 tx_data)
 167 +{
 168 +
 169 +        while (!cns3xxx_spi_bus_idle()) ;       // do nothing
 170 +
 171 +        while (!cns3xxx_spi_tx_buffer_empty()) ;        // do nothing
 172 +
 173 +        SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
 174 +        SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
 175 +
 176 +        SPI_TRANSMIT_BUFFER_REG = tx_data;
 177 +
 178 +        return 1;
 179 +}
 180 +
 181 +static inline struct cns3xxx_spi *to_hw(struct spi_device *sdev)
 182 +{
 183 +       return spi_master_get_devdata(sdev->master);
 184 +}
 185 +
 186 +static int cns3xxx_spi_setup_transfer(struct spi_device *spi,
 187 +                                     struct spi_transfer *t)
 188 +{
 189 +       return 0;
 190 +}
 191 +
 192 +static void cns3xxx_spi_chipselect(struct spi_device *spi, int value)
 193 +{
 194 +       unsigned int spi_config;
 195 +
 196 +       switch (value) {
 197 +       case BITBANG_CS_INACTIVE:
 198 +               break;
 199 +
 200 +       case BITBANG_CS_ACTIVE:
 201 +               spi_config = SPI_CONFIGURATION_REG;
 202 +
 203 +               if (spi->mode & SPI_CPHA)
 204 +                       spi_config |= (0x1 << 13);
 205 +               else
 206 +                       spi_config &= ~(0x1 << 13);
 207 +
 208 +               if (spi->mode & SPI_CPOL)
 209 +                       spi_config |= (0x1 << 14);
 210 +               else
 211 +                       spi_config &= ~(0x1 << 14);
 212 +
 213 +               /* write new configration */
 214 +               SPI_CONFIGURATION_REG = spi_config;
 215 +
 216 +               SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
 217 +               SPI_TRANSMIT_CONTROL_REG |= (spi->chip_select & 0x3);
 218 +
 219 +               break;
 220 +       }
 221 +}
 222 +
 223 +static int cns3xxx_spi_setup(struct spi_device *spi)
 224 +{
 225 +       if (!spi->bits_per_word)
 226 +               spi->bits_per_word = 8;
 227 +
 228 +       return 0;
 229 +}
 230 +
 231 +static int cns3xxx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
 232 +{
 233 +       struct cns3xxx_spi *hw = to_hw(spi);
 234 +
 235 +       dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf,
 236 +               t->len);
 237 +
 238 +       hw->tx = t->tx_buf;
 239 +       hw->rx = t->rx_buf;
 240 +       hw->len = t->len;
 241 +       hw->count = 0;
 242 +       hw->last_in_message_list = t->last_in_message_list;
 243 +
 244 +       init_completion(&hw->done);
 245 +
 246 +       if (hw->tx) {
 247 +               int i;
 248 +               u32 rx_data;
 249 +               for (i = 0; i < (hw->len - 1); i++) {
 250 +                       dev_dbg(&spi->dev,
 251 +                               "[SPI_CNS3XXX_DEBUG] hw->tx[%02d]: 0x%02x\n", i,
 252 +                               hw->tx[i]);
 253 +                       cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
 254 +                                         &rx_data);
 255 +                       if (hw->rx) {
 256 +                               hw->rx[i] = rx_data;
 257 +                               dev_dbg(&spi->dev,
 258 +                                       "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
 259 +                                       i, hw->rx[i]);
 260 +                       }
 261 +               }
 262 +
 263 +               if (t->last_in_message_list) {
 264 +                       cns3xxx_spi_tx_rx(spi->chip_select, 1, hw->tx[i],
 265 +                                         &rx_data);
 266 +                       if (hw->rx) {
 267 +                               hw->rx[i] = rx_data;
 268 +                               dev_dbg(&spi->dev,
 269 +                                       "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
 270 +                                       i, hw->rx[i]);
 271 +                       }
 272 +               } else {
 273 +                       cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
 274 +                                         &rx_data);
 275 +               }
 276 +               goto done;
 277 +       }
 278 +
 279 +       if (hw->rx) {
 280 +               int i;
 281 +               u32 rx_data;
 282 +               for (i = 0; i < (hw->len - 1); i++) {
 283 +                       cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
 284 +                       hw->rx[i] = rx_data;
 285 +                       dev_dbg(&spi->dev,
 286 +                               "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", i,
 287 +                               hw->rx[i]);
 288 +               }
 289 +
 290 +               if (t->last_in_message_list) {
 291 +                       cns3xxx_spi_tx_rx(spi->chip_select, 1, 0xff, &rx_data);
 292 +               } else {
 293 +                       cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
 294 +               }
 295 +               hw->rx[i] = rx_data;
 296 +               dev_dbg(&spi->dev, "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
 297 +                       i, hw->rx[i]);
 298 +       }
 299 +done:
 300 +       return hw->len;
 301 +}
 302 +
 303 +static void __init cns3xxx_spi_initial(void)
 304 +{
 305 +       u32 __iomem *gpiob = __io(CNS3XXX_MISC_BASE_VIRT + 0x0018);
 306 +       u32 gpiob_pins = __raw_readl(gpiob);
 307 +
 308 +       /* MMC/SD pins share with GPIOA */
 309 +       gpiob_pins |= 0xf80;
 310 +       __raw_writel(gpiob_pins, gpiob);
 311 +
 312 +       /* share pin config. */
 313 +       //PM_PLL_HM_PD_CTRL_REG &= ~(0x1 << 5);
 314 +       //HAL_MISC_ENABLE_SPI_PINS();
 315 +       cns3xxx_pwr_clk_en(CNS3XXX_PWR_CLK_EN(SPI_PCM_I2C));
 316 +       cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(SPI_PCM_I2C));
 317 +
 318 +       SPI_CONFIGURATION_REG = (((0x0 & 0x3) << 0) |   /* 8bits shift length */
 319 +                                (0x0 << 9) |   /* SPI mode */
 320 +                                (0x0 << 10) |  /* disable FIFO */
 321 +                                (0x1 << 11) |  /* SPI master mode */
 322 +                                (0x0 << 12) |  /* disable SPI loopback mode */
 323 +                                (0x1 << 13) |  /* clock phase */
 324 +                                (0x1 << 14) |  /* clock polarity */
 325 +                                (0x0 << 24) |  /* disable - SPI data swap */
 326 +                                (0x1 << 29) |  /* enable - 2IO Read mode */
 327 +                                (0x0 << 30) |  /* disable - SPI high speed read for system boot up */
 328 +                                (0x0 << 31));  /* disable - SPI */
 329 +
 330 +       /* Set SPI bit rate PCLK/2 */
 331 +       SPI_BIT_RATE_CONTROL_REG = 0x1;
 332 +
 333 +       /* Set SPI Tx channel 0 */
 334 +       SPI_TRANSMIT_CONTROL_REG = 0x0;
 335 +
 336 +       /* Set Tx FIFO Threshold, Tx FIFO has 2 words */
 337 +       SPI_FIFO_TRANSMIT_CONFIG_REG &= ~(0x03 << 4);
 338 +       SPI_FIFO_TRANSMIT_CONFIG_REG |= ((0x0 & 0x03) << 4);
 339 +
 340 +       /* Set Rx FIFO Threshold, Rx FIFO has 2 words */
 341 +       SPI_FIFO_RECEIVE_CONFIG_REG &= ~(0x03 << 4);
 342 +       SPI_FIFO_RECEIVE_CONFIG_REG |= ((0x0 & 0x03) << 4);
 343 +
 344 +       /* Disable all interrupt */
 345 +       SPI_INTERRUPT_ENABLE_REG = 0x0;
 346 +
 347 +       /* Clear spurious interrupt sources */
 348 +       SPI_INTERRUPT_STATUS_REG = (0x0F << 4);
 349 +
 350 +       /* Enable SPI */
 351 +       SPI_CONFIGURATION_REG |= (0x1 << 31);
 352 +
 353 +       return;
 354 +}
 355 +
 356 +static int __init cns3xxx_spi_probe(struct platform_device *pdev)
 357 +{
 358 +       struct spi_master *master;
 359 +       struct cns3xxx_spi *hw;
 360 +       int err = 0;
 361 +
 362 +       printk("%s: setup CNS3XXX SPI Controller\n", __FUNCTION__);
 363 +
 364 +       /* Allocate master with space for cns3xxx_spi */
 365 +       master = spi_alloc_master(&pdev->dev, sizeof(struct cns3xxx_spi));
 366 +       if (master == NULL) {
 367 +               dev_err(&pdev->dev, "No memory for spi_master\n");
 368 +               err = -ENOMEM;
 369 +               goto err_nomem;
 370 +       }
 371 +
 372 +       hw = spi_master_get_devdata(master);
 373 +       memset(hw, 0, sizeof(struct cns3xxx_spi));
 374 +
 375 +       hw->master = spi_master_get(master);
 376 +       hw->dev = &pdev->dev;
 377 +
 378 +       platform_set_drvdata(pdev, hw);
 379 +       init_completion(&hw->done);
 380 +
 381 +       /* setup the master state. */
 382 +
 383 +       master->num_chipselect = 4;
 384 +       master->bus_num = 1;
 385 +
 386 +       /* setup the state for the bitbang driver */
 387 +
 388 +       hw->bitbang.master = hw->master;
 389 +       hw->bitbang.setup_transfer = cns3xxx_spi_setup_transfer;
 390 +       hw->bitbang.chipselect = cns3xxx_spi_chipselect;
 391 +       hw->bitbang.txrx_bufs = cns3xxx_spi_txrx;
 392 +       hw->bitbang.master->setup = cns3xxx_spi_setup;
 393 +
 394 +       dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
 395 +
 396 +       /* SPI controller initializations */
 397 +       cns3xxx_spi_initial();
 398 +
 399 +       /* register SPI controller */
 400 +
 401 +       err = spi_bitbang_start(&hw->bitbang);
 402 +       if (err) {
 403 +               dev_err(&pdev->dev, "Failed to register SPI master\n");
 404 +               goto err_register;
 405 +       }
 406 +
 407 +       return 0;
 408 +
 409 +err_register:
 410 +       spi_master_put(hw->master);;
 411 +
 412 +err_nomem:
 413 +       return err;
 414 +}
 415 +
 416 +static int __devexit cns3xxx_spi_remove(struct platform_device *dev)
 417 +{
 418 +       struct cns3xxx_spi *hw = platform_get_drvdata(dev);
 419 +
 420 +       platform_set_drvdata(dev, NULL);
 421 +
 422 +       spi_unregister_master(hw->master);
 423 +
 424 +       spi_master_put(hw->master);
 425 +       return 0;
 426 +}
 427 +
 428 +#ifdef CONFIG_PM
 429 +
 430 +static int cns3xxx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
 431 +{
 432 +       struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
 433 +
 434 +       return 0;
 435 +}
 436 +
 437 +static int cns3xxx_spi_resume(struct platform_device *pdev)
 438 +{
 439 +       struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
 440 +
 441 +       return 0;
 442 +}
 443 +
 444 +#else
 445 +#define cns3xxx_spi_suspend    NULL
 446 +#define cns3xxx_spi_resume     NULL
 447 +#endif
 448 +
 449 +static struct platform_driver cns3xxx_spi_driver = {
 450 +       .probe          = cns3xxx_spi_probe,
 451 +       .remove         = __devexit_p(cns3xxx_spi_remove),
 452 +       .suspend        = cns3xxx_spi_suspend,
 453 +       .resume         = cns3xxx_spi_resume,
 454 +       .driver         = {
 455 +               .name = "cns3xxx_spi",
 456 +               .owner = THIS_MODULE,
 457 +       },
 458 +};
 459 +
 460 +static int __init cns3xxx_spi_init(void)
 461 +{
 462 +       return platform_driver_register(&cns3xxx_spi_driver);
 463 +}
 464 +
 465 +static void __exit cns3xxx_spi_exit(void)
 466 +{
 467 +       platform_driver_unregister(&cns3xxx_spi_driver);
 468 +}
 469 +
 470 +module_init(cns3xxx_spi_init);
 471 +module_exit(cns3xxx_spi_exit);
 472 +
 473 +MODULE_AUTHOR("Cavium Networks");
 474 +MODULE_DESCRIPTION("CNS3XXX SPI Controller Driver");
 475 +MODULE_LICENSE("GPL");
 476 +MODULE_ALIAS("platform:cns3xxx_spi");
 477 +
 478 +EXPORT_SYMBOL_GPL(cns3xxx_spi_tx_rx);
 479 --- a/include/linux/spi/spi.h
 480 +++ b/include/linux/spi/spi.h
 481 @@ -446,6 +446,13 @@ struct spi_transfer {
 482         u32             speed_hz;
 483
 484         struct list_head transfer_list;
 485 +
 486 +#ifdef CONFIG_ARCH_CNS3XXX
 487 +       unsigned        last_in_message_list;
 488 +#ifdef CONFIG_SPI_CNS3XXX_2IOREAD
 489 +       u8              dio_read;
 490 +#endif
 491 +#endif
 492  };
 493
 494  /**
 495 --- a/drivers/spi/spi-bitbang.c
 496 +++ b/drivers/spi/spi-bitbang.c
 497 @@ -329,6 +329,12 @@ static void bitbang_work(struct work_str
 498                                  */
 499                                 if (!m->is_dma_mapped)
 500                                         t->rx_dma = t->tx_dma = 0;
 501 +
 502 +                               if (t->transfer_list.next == &m->transfers)
 503 +                                       t->last_in_message_list = 1;
 504 +                               else
 505 +                                       t->last_in_message_list = 0;
 506 +
 507                                 status = bitbang->txrx_bufs(spi, t);
 508                         }
 509                         if (status > 0)