target/linux/lantiq/patches/915-falcon-spi-flash.patch

   1 --- a/drivers/spi/Makefile
   2 +++ b/drivers/spi/Makefile
   3 @@ -22,6 +22,7 @@ obj-$(CONFIG_SPI_DESIGNWARE)          += dw_spi.
   4  obj-$(CONFIG_SPI_DW_PCI)               += dw_spi_pci.o
   5  obj-$(CONFIG_SPI_DW_MMIO)              += dw_spi_mmio.o
   6  obj-$(CONFIG_SPI_EP93XX)               += ep93xx_spi.o
   7 +obj-$(CONFIG_SPI_FALCON)               += spi_falcon.o
   8  obj-$(CONFIG_SPI_GPIO)                 += spi_gpio.o
   9  obj-$(CONFIG_SPI_GPIO_OLD)             += spi_gpio_old.o
  10  obj-$(CONFIG_SPI_IMX)                  += spi_imx.o
  11 --- /dev/null
  12 +++ b/drivers/spi/spi_falcon.c
  13 @@ -0,0 +1,471 @@
  14 +/*
  15 + *   This program is free software; you can redistribute it and/or modify
  16 + *   it under the terms of the GNU General Public License as published by
  17 + *   the Free Software Foundation; either version 2 of the License, or
  18 + *   (at your option) any later version.
  19 + *
  20 + *   This program is distributed in the hope that it will be useful,
  21 + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 + *   GNU General Public License for more details.
  24 + *
  25 + *   You should have received a copy of the GNU General Public License
  26 + *   along with this program; if not, write to the Free Software
  27 + *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  28 + */
  29 +
  30 +#include <linux/module.h>
  31 +#include <linux/device.h>
  32 +#include <linux/platform_device.h>
  33 +#include <linux/spi/spi.h>
  34 +#include <linux/delay.h>
  35 +#include <linux/workqueue.h>
  36 +
  37 +#include <lantiq.h> /* ebu_lock */
  38 +#include <falcon/ebu_reg.h>
  39 +#include <falcon/sys1_reg.h>
  40 +
  41 +#define DRV_NAME                       "falcon_spi"
  42 +
  43 +#define FALCON_SPI_XFER_BEGIN          (1 << 0)
  44 +#define FALCON_SPI_XFER_END            (1 << 1)
  45 +
  46 +/* mapping for access macros */
  47 +#define reg_r32(reg)                   __raw_readl(reg)
  48 +#define reg_w32(val, reg)              __raw_writel(val, reg)
  49 +#define reg_w32_mask(clear, set, reg)  reg_w32((reg_r32(reg) \
  50 +                                                & ~(clear)) | (set), reg)
  51 +#define reg_r32_table(reg, idx)                reg_r32(&((uint32_t *)&reg)[idx])
  52 +#define reg_w32_table(val, reg, idx)   reg_w32(val, &((uint32_t *)&reg)[idx])
  53 +
  54 +#define ebu                            (priv->ebu_membase)
  55 +#define sys1                           (priv->sys1_membase)
  56 +
  57 +struct falcon_spi {
  58 +       u32 sfcmd; /* for caching of opcode, direction, ... */
  59 +
  60 +       struct spi_master *master;
  61 +
  62 +       struct gpon_reg_ebu __iomem *ebu_membase;
  63 +       struct gpon_reg_sys1 __iomem *sys1_membase;
  64 +};
  65 +
  66 +int falcon_spi_xfer(struct spi_device *spi,
  67 +                   struct spi_transfer *t,
  68 +                   unsigned long flags)
  69 +{
  70 +       struct device *dev = &spi->dev;
  71 +       struct falcon_spi *priv = spi_master_get_devdata(spi->master);
  72 +       const u8 *txp = t->tx_buf;
  73 +       u8 *rxp = t->rx_buf;
  74 +       unsigned int bytelen = ((8 * t->len + 7) / 8);
  75 +       unsigned int len, alen, dumlen;
  76 +       u32 val;
  77 +       enum {
  78 +               state_init,
  79 +               state_command_prepare,
  80 +               state_write,
  81 +               state_read,
  82 +               state_disable_cs,
  83 +               state_end
  84 +       } state = state_init;
  85 +
  86 +       do {
  87 +               switch (state) {
  88 +               case state_init: /* detect phase of upper layer sequence */
  89 +               {
  90 +                       /* initial write ? */
  91 +                       if (flags & FALCON_SPI_XFER_BEGIN) {
  92 +                               if (!txp) {
  93 +                                       dev_err(dev,
  94 +                                               "BEGIN without tx data!\n");
  95 +                                       return -1;
  96 +                               }
  97 +                               /*
  98 +                                * Prepare the parts of the sfcmd register,
  99 +                                * which should not
 100 +                                * change during a sequence!
 101 +                                * Only exception are the length fields,
 102 +                                * especially alen and dumlen.
 103 +                                */
 104 +
 105 +                               priv->sfcmd = ((spi->chip_select
 106 +                                               << SFCMD_CS_OFFSET)
 107 +                                              & SFCMD_CS_MASK);
 108 +                               priv->sfcmd |= SFCMD_KEEP_CS_KEEP_SELECTED;
 109 +                               priv->sfcmd |= *txp;
 110 +                               txp++;
 111 +                               bytelen--;
 112 +                               if (bytelen) {
 113 +                                       /* more data:
 114 +                                        * maybe address and/or dummy */
 115 +                                       state = state_command_prepare;
 116 +                                       break;
 117 +                               } else {
 118 +                                       dev_dbg(dev, "write cmd %02X\n",
 119 +                                               priv->sfcmd & SFCMD_OPC_MASK);
 120 +                               }
 121 +                       }
 122 +                       /* continued write ? */
 123 +                       if (txp && bytelen) {
 124 +                               state = state_write;
 125 +                               break;
 126 +                       }
 127 +                       /* read data? */
 128 +                       if (rxp && bytelen) {
 129 +                               state = state_read;
 130 +                               break;
 131 +                       }
 132 +                       /* end of sequence? */
 133 +                       if (flags & FALCON_SPI_XFER_END)
 134 +                               state = state_disable_cs;
 135 +                       else
 136 +                               state = state_end;
 137 +                       break;
 138 +               }
 139 +               case state_command_prepare: /* collect tx data for
 140 +                                              address and dummy phase */
 141 +               {
 142 +                       /* txp is valid, already checked */
 143 +                       val = 0;
 144 +                       alen = 0;
 145 +                       dumlen = 0;
 146 +                       while (bytelen > 0) {
 147 +                               if (alen < 3) {
 148 +                                       val = (val<<8)|(*txp++);
 149 +                                       alen++;
 150 +                               } else if ((dumlen < 15) && (*txp == 0)) {
 151 +                                       /*
 152 +                                        * assume dummy bytes are set to 0
 153 +                                        * from upper layer
 154 +                                        */
 155 +                                       dumlen++;
 156 +                                       txp++;
 157 +                               } else
 158 +                                       break;
 159 +                               bytelen--;
 160 +                       }
 161 +                       priv->sfcmd &= ~(SFCMD_ALEN_MASK | SFCMD_DUMLEN_MASK);
 162 +                       priv->sfcmd |= (alen << SFCMD_ALEN_OFFSET) |
 163 +                                        (dumlen << SFCMD_DUMLEN_OFFSET);
 164 +                       if (alen > 0)
 165 +                               ebu_w32(val, sfaddr);
 166 +
 167 +                       dev_dbg(dev, "write cmd %02X, alen=%d "
 168 +                               "(addr=%06X) dumlen=%d\n",
 169 +                               priv->sfcmd & SFCMD_OPC_MASK,
 170 +                               alen, val, dumlen);
 171 +
 172 +                       if (bytelen > 0) {
 173 +                               /* continue with write */
 174 +                               state = state_write;
 175 +                       } else if (flags & FALCON_SPI_XFER_END) {
 176 +                               /* end of sequence? */
 177 +                               state = state_disable_cs;
 178 +                       } else {
 179 +                               /* go to end and expect another
 180 +                                * call (read or write) */
 181 +                               state = state_end;
 182 +                       }
 183 +                       break;
 184 +               }
 185 +               case state_write:
 186 +               {
 187 +                       /* txp still valid */
 188 +                       priv->sfcmd |= SFCMD_DIR_WRITE;
 189 +                       len = 0;
 190 +                       val = 0;
 191 +                       do {
 192 +                               if (bytelen--)
 193 +                                       val |= (*txp++) << (8 * len++);
 194 +                               if ((flags & FALCON_SPI_XFER_END)
 195 +                                   && (bytelen == 0)) {
 196 +                                       priv->sfcmd &=
 197 +                                               ~SFCMD_KEEP_CS_KEEP_SELECTED;
 198 +                               }
 199 +                               if ((len == 4) || (bytelen == 0)) {
 200 +                                       ebu_w32(val, sfdata);
 201 +                                       ebu_w32(priv->sfcmd
 202 +                                               | (len<<SFCMD_DLEN_OFFSET),
 203 +                                               sfcmd);
 204 +                                       len = 0;
 205 +                                       val = 0;
 206 +                                       priv->sfcmd &= ~(SFCMD_ALEN_MASK
 207 +                                                        | SFCMD_DUMLEN_MASK);
 208 +                               }
 209 +                       } while (bytelen);
 210 +                       state = state_end;
 211 +                       break;
 212 +               }
 213 +               case state_read:
 214 +               {
 215 +                       /* read data */
 216 +                       priv->sfcmd &= ~SFCMD_DIR_WRITE;
 217 +                       do {
 218 +                               if ((flags & FALCON_SPI_XFER_END)
 219 +                                   && (bytelen <= 4)) {
 220 +                                       priv->sfcmd &=
 221 +                                               ~SFCMD_KEEP_CS_KEEP_SELECTED;
 222 +                               }
 223 +                               len = (bytelen > 4) ? 4 : bytelen;
 224 +                               bytelen -= len;
 225 +                               ebu_w32(priv->sfcmd
 226 +                                       |(len<<SFCMD_DLEN_OFFSET), sfcmd);
 227 +                               priv->sfcmd &= ~(SFCMD_ALEN_MASK
 228 +                                                | SFCMD_DUMLEN_MASK);
 229 +                               do {
 230 +                                       val = ebu_r32(sfstat);
 231 +                                       if (val & SFSTAT_CMD_ERR) {
 232 +                                               /* reset error status */
 233 +                                               dev_err(dev, "SFSTAT: CMD_ERR "
 234 +                                                       "(%x)\n", val);
 235 +                                               ebu_w32(SFSTAT_CMD_ERR, sfstat);
 236 +                                               return -1;
 237 +                                       }
 238 +                               } while (val & SFSTAT_CMD_PEND);
 239 +                               val = ebu_r32(sfdata);
 240 +                               do {
 241 +                                       *rxp = (val & 0xFF);
 242 +                                       rxp++;
 243 +                                       val >>= 8;
 244 +                                       len--;
 245 +                               } while (len);
 246 +                       } while (bytelen);
 247 +                       state = state_end;
 248 +                       break;
 249 +               }
 250 +               case state_disable_cs:
 251 +               {
 252 +                       priv->sfcmd &= ~SFCMD_KEEP_CS_KEEP_SELECTED;
 253 +                       ebu_w32(priv->sfcmd | (0<<SFCMD_DLEN_OFFSET), sfcmd);
 254 +                       val = ebu_r32(sfstat);
 255 +                       if (val & SFSTAT_CMD_ERR) {
 256 +                               /* reset error status */
 257 +                               dev_err(dev, "SFSTAT: CMD_ERR (%x)\n", val);
 258 +                               ebu_w32(SFSTAT_CMD_ERR, sfstat);
 259 +                               return -1;
 260 +                       }
 261 +                       state = state_end;
 262 +                       break;
 263 +               }
 264 +               case state_end:
 265 +                       break;
 266 +               }
 267 +       } while (state != state_end);
 268 +
 269 +       return 0;
 270 +}
 271 +
 272 +static int falcon_spi_setup(struct spi_device *spi)
 273 +{
 274 +       struct device *dev = &spi->dev;
 275 +       struct falcon_spi *priv = spi_master_get_devdata(spi->master);
 276 +       const u32 ebuclk = 100*1000*1000;
 277 +       unsigned int i;
 278 +       unsigned long flags;
 279 +
 280 +       dev_dbg(dev, "setup\n");
 281 +
 282 +       if (spi->master->bus_num > 0 || spi->chip_select > 0)
 283 +               return -ENODEV;
 284 +
 285 +       spin_lock_irqsave(&ebu_lock, flags);
 286 +
 287 +       if (ebuclk < spi->max_speed_hz) {
 288 +               /* set EBU clock to 100 MHz */
 289 +               sys1_w32_mask(0, EBUCC_EBUDIV_SELF100, ebucc);
 290 +               i = 1; /* divider */
 291 +       } else {
 292 +               /* set EBU clock to 50 MHz */
 293 +               sys1_w32_mask(EBUCC_EBUDIV_SELF100, 0, ebucc);
 294 +
 295 +               /* search for suitable divider */
 296 +               for (i = 1; i < 7; i++) {
 297 +                       if (ebuclk / i <= spi->max_speed_hz)
 298 +                               break;
 299 +               }
 300 +       }
 301 +
 302 +       /* setup period of serial clock */
 303 +       ebu_w32_mask(SFTIME_SCKF_POS_MASK
 304 +                    | SFTIME_SCKR_POS_MASK
 305 +                    | SFTIME_SCK_PER_MASK,
 306 +                    (i << SFTIME_SCKR_POS_OFFSET)
 307 +                    | (i << (SFTIME_SCK_PER_OFFSET + 1)),
 308 +                    sftime);
 309 +
 310 +       /* set some bits of unused_wd, to not trigger HOLD/WP
 311 +        * signals on non QUAD flashes */
 312 +       ebu_w32((SFIO_UNUSED_WD_MASK & (0x8|0x4)), sfio);
 313 +
 314 +       ebu_w32(BUSRCON0_AGEN_SERIAL_FLASH | BUSRCON0_PORTW_8_BIT_MUX,
 315 +               busrcon0);
 316 +       ebu_w32(BUSWCON0_AGEN_SERIAL_FLASH, buswcon0);
 317 +       /* set address wrap around to maximum for 24-bit addresses */
 318 +       ebu_w32_mask(SFCON_DEV_SIZE_MASK, SFCON_DEV_SIZE_A23_0, sfcon);
 319 +
 320 +       spin_unlock_irqrestore(&ebu_lock, flags);
 321 +
 322 +       return 0;
 323 +}
 324 +
 325 +static int falcon_spi_transfer(struct spi_device *spi, struct spi_message *m)
 326 +{
 327 +       struct falcon_spi *priv = spi_master_get_devdata(spi->master);
 328 +       struct spi_transfer *t;
 329 +       unsigned long spi_flags;
 330 +       unsigned long flags;
 331 +       int ret = 0;
 332 +
 333 +       priv->sfcmd = 0;
 334 +       m->actual_length = 0;
 335 +
 336 +       spi_flags = FALCON_SPI_XFER_BEGIN;
 337 +       list_for_each_entry(t, &m->transfers, transfer_list) {
 338 +               if (list_is_last(&t->transfer_list, &m->transfers))
 339 +                       spi_flags |= FALCON_SPI_XFER_END;
 340 +
 341 +               spin_lock_irqsave(&ebu_lock, flags);
 342 +               ret = falcon_spi_xfer(spi, t, spi_flags);
 343 +               spin_unlock_irqrestore(&ebu_lock, flags);
 344 +
 345 +               if (ret)
 346 +                       break;
 347 +
 348 +               m->actual_length += t->len;
 349 +
 350 +               if (t->delay_usecs || t->cs_change)
 351 +                       BUG();
 352 +
 353 +               spi_flags = 0;
 354 +       }
 355 +
 356 +       m->status = ret;
 357 +       m->complete(m->context);
 358 +
 359 +       return 0;
 360 +}
 361 +
 362 +static void falcon_spi_cleanup(struct spi_device *spi)
 363 +{
 364 +       struct device *dev = &spi->dev;
 365 +
 366 +       dev_dbg(dev, "cleanup\n");
 367 +}
 368 +
 369 +static int __devinit falcon_spi_probe(struct platform_device *pdev)
 370 +{
 371 +       struct device *dev = &pdev->dev;
 372 +       struct falcon_spi *priv;
 373 +       struct spi_master *master;
 374 +       struct resource *memres_ebu, *memres_sys1;
 375 +       int ret;
 376 +
 377 +       dev_dbg(dev, "probing\n");
 378 +
 379 +       memres_ebu = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ebu");
 380 +       memres_sys1 = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 381 +                                                  "sys1");
 382 +
 383 +       if (!memres_ebu || !memres_sys1) {
 384 +               dev_err(dev, "no resources\n");
 385 +               return -ENODEV;
 386 +       }
 387 +
 388 +       master = spi_alloc_master(&pdev->dev, sizeof(*priv));
 389 +       if (!master) {
 390 +               dev_err(dev, "no memory for spi_master\n");
 391 +               return -ENOMEM;
 392 +       }
 393 +
 394 +       priv = spi_master_get_devdata(master);
 395 +
 396 +       priv->ebu_membase = ioremap_nocache(memres_ebu->start & ~KSEG1,
 397 +                                           resource_size(memres_ebu));
 398 +
 399 +       if (!priv->ebu_membase) {
 400 +               dev_err(dev, "can't map ebu memory\n");
 401 +
 402 +               ret = -ENOMEM;
 403 +               goto free_master;
 404 +       }
 405 +
 406 +       priv->sys1_membase = ioremap_nocache(memres_sys1->start & ~KSEG1,
 407 +                                           resource_size(memres_sys1));
 408 +
 409 +       if (!priv->sys1_membase) {
 410 +               dev_err(dev, "can't map sys1 memory\n");
 411 +
 412 +               ret = -ENOMEM;
 413 +               goto unmap_ebu;
 414 +       }
 415 +
 416 +       priv->master = master;
 417 +
 418 +       master->mode_bits = SPI_MODE_3;
 419 +       master->num_chipselect = 1;
 420 +       master->bus_num = 0;
 421 +
 422 +       master->setup = falcon_spi_setup;
 423 +       master->transfer = falcon_spi_transfer;
 424 +       master->cleanup = falcon_spi_cleanup;
 425 +
 426 +       platform_set_drvdata(pdev, priv);
 427 +
 428 +       ret = spi_register_master(master);
 429 +       if (ret)
 430 +               goto unmap_sys1;
 431 +
 432 +       return 0;
 433 +
 434 +unmap_sys1:
 435 +       iounmap(priv->sys1_membase);
 436 +
 437 +unmap_ebu:
 438 +       iounmap(priv->ebu_membase);
 439 +
 440 +free_master:
 441 +       spi_master_put(master);
 442 +
 443 +       return ret;
 444 +}
 445 +
 446 +static int __devexit falcon_spi_remove(struct platform_device *pdev)
 447 +{
 448 +       struct device *dev = &pdev->dev;
 449 +       struct falcon_spi *priv = platform_get_drvdata(pdev);
 450 +
 451 +       dev_dbg(dev, "removed\n");
 452 +
 453 +       spi_unregister_master(priv->master);
 454 +
 455 +       iounmap(priv->sys1_membase);
 456 +       iounmap(priv->ebu_membase);
 457 +
 458 +       return 0;
 459 +}
 460 +
 461 +static struct platform_driver falcon_spi_driver = {
 462 +       .probe  = falcon_spi_probe,
 463 +       .remove = __devexit_p(falcon_spi_remove),
 464 +       .driver = {
 465 +               .name   = DRV_NAME,
 466 +               .owner  = THIS_MODULE
 467 +       }
 468 +};
 469 +
 470 +static int __init falcon_spi_init(void)
 471 +{
 472 +       return platform_driver_register(&falcon_spi_driver);
 473 +}
 474 +
 475 +static void __exit falcon_spi_exit(void)
 476 +{
 477 +       platform_driver_unregister(&falcon_spi_driver);
 478 +}
 479 +
 480 +module_init(falcon_spi_init);
 481 +module_exit(falcon_spi_exit);
 482 +
 483 +MODULE_LICENSE("GPL");
 484 +MODULE_DESCRIPTION("Lantiq Falcon SPI controller driver");
 485 --- a/drivers/spi/Kconfig
 486 +++ b/drivers/spi/Kconfig
 487 @@ -169,6 +169,10 @@ config SPI_LM70_LLP
 488           which interfaces to an LM70 temperature sensor using
 489           a parallel port.
 490
 491 +config SPI_FALCON
 492 +       tristate "Falcon SPI controller support"
 493 +       depends on SOC_LANTIQ_FALCON
 494 +
 495  config SPI_MPC52xx
 496         tristate "Freescale MPC52xx SPI (non-PSC) controller support"
 497         depends on PPC_MPC52xx && SPI