kernel/drivers/i2c/busses/i2c-octeon.c

   1 /*
   2  * (C) Copyright 2009-2010
   3  * Nokia Siemens Networks, michael.lawnick.ext@nsn.com
   4  *
   5  * Portions Copyright (C) 2010, 2011 Cavium Networks, Inc.
   6  *
   7  * This is a driver for the i2c adapter in Cavium Networks' OCTEON processors.
   8  *
   9  * This file is licensed under the terms of the GNU General Public
  10  * License version 2. This program is licensed "as is" without any
  11  * warranty of any kind, whether express or implied.
  12  */
  13
  14 #include <linux/platform_device.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/delay.h>
  19 #include <linux/sched.h>
  20 #include <linux/slab.h>
  21 #include <linux/i2c.h>
  22 #include <linux/io.h>
  23 #include <linux/of.h>
  24
  25 #include <asm/octeon/octeon.h>
  26
  27 #define DRV_NAME "i2c-octeon"
  28
  29 /* The previous out-of-tree version was implicitly version 1.0. */
  30 #define DRV_VERSION     "2.0"
  31
  32 /* register offsets */
  33 #define SW_TWSI  0x00
  34 #define TWSI_INT 0x10
  35
  36 /* Controller command patterns */
  37 #define SW_TWSI_V               0x8000000000000000ull
  38 #define SW_TWSI_EOP_TWSI_DATA   0x0C00000100000000ull
  39 #define SW_TWSI_EOP_TWSI_CTL    0x0C00000200000000ull
  40 #define SW_TWSI_EOP_TWSI_CLKCTL 0x0C00000300000000ull
  41 #define SW_TWSI_EOP_TWSI_STAT   0x0C00000300000000ull
  42 #define SW_TWSI_EOP_TWSI_RST    0x0C00000700000000ull
  43 #define SW_TWSI_OP_TWSI_CLK     0x0800000000000000ull
  44 #define SW_TWSI_R               0x0100000000000000ull
  45
  46 /* Controller command and status bits */
  47 #define TWSI_CTL_CE   0x80
  48 #define TWSI_CTL_ENAB 0x40
  49 #define TWSI_CTL_STA  0x20
  50 #define TWSI_CTL_STP  0x10
  51 #define TWSI_CTL_IFLG 0x08
  52 #define TWSI_CTL_AAK  0x04
  53
  54 /* Some status values */
  55 #define STAT_START      0x08
  56 #define STAT_RSTART     0x10
  57 #define STAT_TXADDR_ACK 0x18
  58 #define STAT_TXDATA_ACK 0x28
  59 #define STAT_RXADDR_ACK 0x40
  60 #define STAT_RXDATA_ACK 0x50
  61 #define STAT_IDLE       0xF8
  62
  63 struct octeon_i2c {
  64         wait_queue_head_t queue;
  65         struct i2c_adapter adap;
  66         int irq;
  67         u32 twsi_freq;
  68         int sys_freq;
  69         resource_size_t twsi_phys;
  70         void __iomem *twsi_base;
  71         resource_size_t regsize;
  72         struct device *dev;
  73 };
  74
  75 /**
  76  * octeon_i2c_write_sw - write an I2C core register.
  77  * @i2c: The struct octeon_i2c.
  78  * @eop_reg: Register selector.
  79  * @data: Value to be written.
  80  *
  81  * The I2C core registers are accessed indirectly via the SW_TWSI CSR.
  82  */
  83 static void octeon_i2c_write_sw(struct octeon_i2c *i2c,
  84                                 u64 eop_reg,
  85                                 u8 data)
  86 {
  87         u64 tmp;
  88
  89         __raw_writeq(SW_TWSI_V | eop_reg | data, i2c->twsi_base + SW_TWSI);
  90         do {
  91                 tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
  92         } while ((tmp & SW_TWSI_V) != 0);
  93 }
  94
  95 /**
  96  * octeon_i2c_read_sw - write an I2C core register.
  97  * @i2c: The struct octeon_i2c.
  98  * @eop_reg: Register selector.
  99  *
 100  * Returns the data.
 101  *
 102  * The I2C core registers are accessed indirectly via the SW_TWSI CSR.
 103  */
 104 static u8 octeon_i2c_read_sw(struct octeon_i2c *i2c, u64 eop_reg)
 105 {
 106         u64 tmp;
 107
 108         __raw_writeq(SW_TWSI_V | eop_reg | SW_TWSI_R, i2c->twsi_base + SW_TWSI);
 109         do {
 110                 tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
 111         } while ((tmp & SW_TWSI_V) != 0);
 112
 113         return tmp & 0xFF;
 114 }
 115
 116 /**
 117  * octeon_i2c_write_int - write the TWSI_INT register
 118  * @i2c: The struct octeon_i2c.
 119  * @data: Value to be written.
 120  */
 121 static void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
 122 {
 123         __raw_writeq(data, i2c->twsi_base + TWSI_INT);
 124         __raw_readq(i2c->twsi_base + TWSI_INT);
 125 }
 126
 127 /**
 128  * octeon_i2c_int_enable - enable the TS interrupt.
 129  * @i2c: The struct octeon_i2c.
 130  *
 131  * The interrupt will be asserted when there is non-STAT_IDLE state in
 132  * the SW_TWSI_EOP_TWSI_STAT register.
 133  */
 134 static void octeon_i2c_int_enable(struct octeon_i2c *i2c)
 135 {
 136         octeon_i2c_write_int(i2c, 0x40);
 137 }
 138
 139 /**
 140  * octeon_i2c_int_disable - disable the TS interrupt.
 141  * @i2c: The struct octeon_i2c.
 142  */
 143 static void octeon_i2c_int_disable(struct octeon_i2c *i2c)
 144 {
 145         octeon_i2c_write_int(i2c, 0);
 146 }
 147
 148 /**
 149  * octeon_i2c_unblock - unblock the bus.
 150  * @i2c: The struct octeon_i2c.
 151  *
 152  * If there was a reset while a device was driving 0 to bus,
 153  * bus is blocked. We toggle it free manually by some clock
 154  * cycles and send a stop.
 155  */
 156 static void octeon_i2c_unblock(struct octeon_i2c *i2c)
 157 {
 158         int i;
 159
 160         dev_dbg(i2c->dev, "%s\n", __func__);
 161         for (i = 0; i < 9; i++) {
 162                 octeon_i2c_write_int(i2c, 0x0);
 163                 udelay(5);
 164                 octeon_i2c_write_int(i2c, 0x200);
 165                 udelay(5);
 166         }
 167         octeon_i2c_write_int(i2c, 0x300);
 168         udelay(5);
 169         octeon_i2c_write_int(i2c, 0x100);
 170         udelay(5);
 171         octeon_i2c_write_int(i2c, 0x0);
 172 }
 173
 174 /**
 175  * octeon_i2c_isr - the interrupt service routine.
 176  * @int: The irq, unused.
 177  * @dev_id: Our struct octeon_i2c.
 178  */
 179 static irqreturn_t octeon_i2c_isr(int irq, void *dev_id)
 180 {
 181         struct octeon_i2c *i2c = dev_id;
 182
 183         octeon_i2c_int_disable(i2c);
 184         wake_up(&i2c->queue);
 185
 186         return IRQ_HANDLED;
 187 }
 188
 189
 190 static int octeon_i2c_test_iflg(struct octeon_i2c *i2c)
 191 {
 192         return (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_CTL) & TWSI_CTL_IFLG) != 0;
 193 }
 194
 195 /**
 196  * octeon_i2c_wait - wait for the IFLG to be set.
 197  * @i2c: The struct octeon_i2c.
 198  *
 199  * Returns 0 on success, otherwise a negative errno.
 200  */
 201 static int octeon_i2c_wait(struct octeon_i2c *i2c)
 202 {
 203         long result;
 204
 205         octeon_i2c_int_enable(i2c);
 206
 207         result = wait_event_timeout(i2c->queue,
 208                                         octeon_i2c_test_iflg(i2c),
 209                                         i2c->adap.timeout);
 210
 211         octeon_i2c_int_disable(i2c);
 212
 213         if (result == 0) {
 214                 dev_dbg(i2c->dev, "%s: timeout\n", __func__);
 215                 return -ETIMEDOUT;
 216         }
 217
 218         return 0;
 219 }
 220
 221 /**
 222  * octeon_i2c_start - send START to the bus.
 223  * @i2c: The struct octeon_i2c.
 224  *
 225  * Returns 0 on success, otherwise a negative errno.
 226  */
 227 static int octeon_i2c_start(struct octeon_i2c *i2c)
 228 {
 229         u8 data;
 230         int result;
 231
 232         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 233                                 TWSI_CTL_ENAB | TWSI_CTL_STA);
 234
 235         result = octeon_i2c_wait(i2c);
 236         if (result) {
 237                 if (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT) == STAT_IDLE) {
 238                         /*
 239                          * Controller refused to send start flag May
 240                          * be a client is holding SDA low - let's try
 241                          * to free it.
 242                          */
 243                         octeon_i2c_unblock(i2c);
 244                         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 245                                             TWSI_CTL_ENAB | TWSI_CTL_STA);
 246
 247                         result = octeon_i2c_wait(i2c);
 248                 }
 249                 if (result)
 250                         return result;
 251         }
 252
 253         data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 254         if ((data != STAT_START) && (data != STAT_RSTART)) {
 255                 dev_err(i2c->dev, "%s: bad status (0x%x)\n", __func__, data);
 256                 return -EIO;
 257         }
 258
 259         return 0;
 260 }
 261
 262 /**
 263  * octeon_i2c_stop - send STOP to the bus.
 264  * @i2c: The struct octeon_i2c.
 265  *
 266  * Returns 0 on success, otherwise a negative errno.
 267  */
 268 static int octeon_i2c_stop(struct octeon_i2c *i2c)
 269 {
 270         u8 data;
 271
 272         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 273                             TWSI_CTL_ENAB | TWSI_CTL_STP);
 274
 275         data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 276
 277         if (data != STAT_IDLE) {
 278                 dev_err(i2c->dev, "%s: bad status(0x%x)\n", __func__, data);
 279                 return -EIO;
 280         }
 281         return 0;
 282 }
 283
 284 /**
 285  * octeon_i2c_write - send data to the bus.
 286  * @i2c: The struct octeon_i2c.
 287  * @target: Target address.
 288  * @data: Pointer to the data to be sent.
 289  * @length: Length of the data.
 290  *
 291  * The address is sent over the bus, then the data.
 292  *
 293  * Returns 0 on success, otherwise a negative errno.
 294  */
 295 static int octeon_i2c_write(struct octeon_i2c *i2c, int target,
 296                             const u8 *data, int length)
 297 {
 298         int i, result;
 299         u8 tmp;
 300
 301         result = octeon_i2c_start(i2c);
 302         if (result)
 303                 return result;
 304
 305         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, target << 1);
 306         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 307
 308         result = octeon_i2c_wait(i2c);
 309         if (result)
 310                 return result;
 311
 312         for (i = 0; i < length; i++) {
 313                 tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 314                 if ((tmp != STAT_TXADDR_ACK) && (tmp != STAT_TXDATA_ACK)) {
 315                         dev_err(i2c->dev,
 316                                 "%s: bad status before write (0x%x)\n",
 317                                 __func__, tmp);
 318                         return -EIO;
 319                 }
 320
 321                 octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, data[i]);
 322                 octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 323
 324                 result = octeon_i2c_wait(i2c);
 325                 if (result)
 326                         return result;
 327         }
 328
 329         return 0;
 330 }
 331
 332 /**
 333  * octeon_i2c_read - receive data from the bus.
 334  * @i2c: The struct octeon_i2c.
 335  * @target: Target address.
 336  * @data: Pointer to the location to store the datae .
 337  * @length: Length of the data.
 338  *
 339  * The address is sent over the bus, then the data is read.
 340  *
 341  * Returns 0 on success, otherwise a negative errno.
 342  */
 343 static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
 344                            u8 *data, int length)
 345 {
 346         int i, result;
 347         u8 tmp;
 348
 349         if (length < 1)
 350                 return -EINVAL;
 351
 352         result = octeon_i2c_start(i2c);
 353         if (result)
 354                 return result;
 355
 356         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, (target<<1) | 1);
 357         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 358
 359         result = octeon_i2c_wait(i2c);
 360         if (result)
 361                 return result;
 362
 363         for (i = 0; i < length; i++) {
 364                 tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 365                 if ((tmp != STAT_RXDATA_ACK) && (tmp != STAT_RXADDR_ACK)) {
 366                         dev_err(i2c->dev,
 367                                 "%s: bad status before read (0x%x)\n",
 368                                 __func__, tmp);
 369                         return -EIO;
 370                 }
 371
 372                 if (i+1 < length)
 373                         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 374                                                 TWSI_CTL_ENAB | TWSI_CTL_AAK);
 375                 else
 376                         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 377                                                 TWSI_CTL_ENAB);
 378
 379                 result = octeon_i2c_wait(i2c);
 380                 if (result)
 381                         return result;
 382
 383                 data[i] = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_DATA);
 384         }
 385         return 0;
 386 }
 387
 388 /**
 389  * octeon_i2c_xfer - The driver's master_xfer function.
 390  * @adap: Pointer to the i2c_adapter structure.
 391  * @msgs: Pointer to the messages to be processed.
 392  * @num: Length of the MSGS array.
 393  *
 394  * Returns the number of messages processed, or a negative errno on
 395  * failure.
 396  */
 397 static int octeon_i2c_xfer(struct i2c_adapter *adap,
 398                            struct i2c_msg *msgs,
 399                            int num)
 400 {
 401         struct i2c_msg *pmsg;
 402         int i;
 403         int ret = 0;
 404         struct octeon_i2c *i2c = i2c_get_adapdata(adap);
 405
 406         for (i = 0; ret == 0 && i < num; i++) {
 407                 pmsg = &msgs[i];
 408                 dev_dbg(i2c->dev,
 409                         "Doing %s %d byte(s) to/from 0x%02x - %d of %d messages\n",
 410                          pmsg->flags & I2C_M_RD ? "read" : "write",
 411                          pmsg->len, pmsg->addr, i + 1, num);
 412                 if (pmsg->flags & I2C_M_RD)
 413                         ret = octeon_i2c_read(i2c, pmsg->addr, pmsg->buf,
 414                                                 pmsg->len);
 415                 else
 416                         ret = octeon_i2c_write(i2c, pmsg->addr, pmsg->buf,
 417                                                 pmsg->len);
 418         }
 419         octeon_i2c_stop(i2c);
 420
 421         return (ret != 0) ? ret : num;
 422 }
 423
 424 static u32 octeon_i2c_functionality(struct i2c_adapter *adap)
 425 {
 426         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 427 }
 428
 429 static const struct i2c_algorithm octeon_i2c_algo = {
 430         .master_xfer = octeon_i2c_xfer,
 431         .functionality = octeon_i2c_functionality,
 432 };
 433
 434 static struct i2c_adapter octeon_i2c_ops = {
 435         .owner = THIS_MODULE,
 436         .name = "OCTEON adapter",
 437         .algo = &octeon_i2c_algo,
 438         .timeout = HZ / 50,
 439 };
 440
 441 /**
 442  * octeon_i2c_setclock - Calculate and set clock divisors.
 443  */
 444 static int octeon_i2c_setclock(struct octeon_i2c *i2c)
 445 {
 446         int tclk, thp_base, inc, thp_idx, mdiv_idx, ndiv_idx, foscl, diff;
 447         int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = 1000000;
 448
 449         for (ndiv_idx = 0; ndiv_idx < 8 && delta_hz != 0; ndiv_idx++) {
 450                 /*
 451                  * An mdiv value of less than 2 seems to not work well
 452                  * with ds1337 RTCs, so we constrain it to larger
 453                  * values.
 454                  */
 455                 for (mdiv_idx = 15; mdiv_idx >= 2 && delta_hz != 0; mdiv_idx--) {
 456                         /*
 457                          * For given ndiv and mdiv values check the
 458                          * two closest thp values.
 459                          */
 460                         tclk = i2c->twsi_freq * (mdiv_idx + 1) * 10;
 461                         tclk *= (1 << ndiv_idx);
 462                         thp_base = (i2c->sys_freq / (tclk * 2)) - 1;
 463                         for (inc = 0; inc <= 1; inc++) {
 464                                 thp_idx = thp_base + inc;
 465                                 if (thp_idx < 5 || thp_idx > 0xff)
 466                                         continue;
 467
 468                                 foscl = i2c->sys_freq / (2 * (thp_idx + 1));
 469                                 foscl = foscl / (1 << ndiv_idx);
 470                                 foscl = foscl / (mdiv_idx + 1) / 10;
 471                                 diff = abs(foscl - i2c->twsi_freq);
 472                                 if (diff < delta_hz) {
 473                                         delta_hz = diff;
 474                                         thp = thp_idx;
 475                                         mdiv = mdiv_idx;
 476                                         ndiv = ndiv_idx;
 477                                 }
 478                         }
 479                 }
 480         }
 481         octeon_i2c_write_sw(i2c, SW_TWSI_OP_TWSI_CLK, thp);
 482         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CLKCTL, (mdiv << 3) | ndiv);
 483
 484         return 0;
 485 }
 486
 487 static int octeon_i2c_initlowlevel(struct octeon_i2c *i2c)
 488 {
 489         u8 status;
 490         int tries;
 491
 492         /* disable high level controller, enable bus access */
 493         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 494
 495         /* reset controller */
 496         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_RST, 0);
 497
 498         for (tries = 10; tries; tries--) {
 499                 udelay(1);
 500                 status = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 501                 if (status == STAT_IDLE)
 502                         return 0;
 503         }
 504         dev_err(i2c->dev, "%s: TWSI_RST failed! (0x%x)\n", __func__, status);
 505         return -EIO;
 506 }
 507
 508 static int octeon_i2c_probe(struct platform_device *pdev)
 509 {
 510         int irq, result = 0;
 511         struct octeon_i2c *i2c;
 512         struct resource *res_mem;
 513
 514         /* All adaptors have an irq.  */
 515         irq = platform_get_irq(pdev, 0);
 516         if (irq < 0)
 517                 return irq;
 518
 519         i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
 520         if (!i2c) {
 521                 dev_err(&pdev->dev, "kzalloc failed\n");
 522                 result = -ENOMEM;
 523                 goto out;
 524         }
 525         i2c->dev = &pdev->dev;
 526
 527         res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 528
 529         if (res_mem == NULL) {
 530                 dev_err(i2c->dev, "found no memory resource\n");
 531                 result = -ENXIO;
 532                 goto out;
 533         }
 534         i2c->twsi_phys = res_mem->start;
 535         i2c->regsize = resource_size(res_mem);
 536
 537         /*
 538          * "clock-rate" is a legacy binding, the official binding is
 539          * "clock-frequency".  Try the official one first and then
 540          * fall back if it doesn't exist.
 541          */
 542         if (of_property_read_u32(pdev->dev.of_node,
 543                                  "clock-frequency", &i2c->twsi_freq) &&
 544             of_property_read_u32(pdev->dev.of_node,
 545                                  "clock-rate", &i2c->twsi_freq)) {
 546                 dev_err(i2c->dev,
 547                         "no I2C 'clock-rate' or 'clock-frequency' property\n");
 548                 result = -ENXIO;
 549                 goto out;
 550         }
 551
 552         i2c->sys_freq = octeon_get_io_clock_rate();
 553
 554         if (!devm_request_mem_region(&pdev->dev, i2c->twsi_phys, i2c->regsize,
 555                                       res_mem->name)) {
 556                 dev_err(i2c->dev, "request_mem_region failed\n");
 557                 goto out;
 558         }
 559         i2c->twsi_base = devm_ioremap(&pdev->dev, i2c->twsi_phys, i2c->regsize);
 560
 561         init_waitqueue_head(&i2c->queue);
 562
 563         i2c->irq = irq;
 564
 565         result = devm_request_irq(&pdev->dev, i2c->irq,
 566                                   octeon_i2c_isr, 0, DRV_NAME, i2c);
 567         if (result < 0) {
 568                 dev_err(i2c->dev, "failed to attach interrupt\n");
 569                 goto out;
 570         }
 571
 572         result = octeon_i2c_initlowlevel(i2c);
 573         if (result) {
 574                 dev_err(i2c->dev, "init low level failed\n");
 575                 goto  out;
 576         }
 577
 578         result = octeon_i2c_setclock(i2c);
 579         if (result) {
 580                 dev_err(i2c->dev, "clock init failed\n");
 581                 goto  out;
 582         }
 583
 584         i2c->adap = octeon_i2c_ops;
 585         i2c->adap.dev.parent = &pdev->dev;
 586         i2c->adap.dev.of_node = pdev->dev.of_node;
 587         i2c_set_adapdata(&i2c->adap, i2c);
 588         platform_set_drvdata(pdev, i2c);
 589
 590         result = i2c_add_adapter(&i2c->adap);
 591         if (result < 0) {
 592                 dev_err(i2c->dev, "failed to add adapter\n");
 593                 goto out;
 594         }
 595         dev_info(i2c->dev, "version %s\n", DRV_VERSION);
 596
 597         return 0;
 598
 599 out:
 600         return result;
 601 };
 602
 603 static int octeon_i2c_remove(struct platform_device *pdev)
 604 {
 605         struct octeon_i2c *i2c = platform_get_drvdata(pdev);
 606
 607         i2c_del_adapter(&i2c->adap);
 608         return 0;
 609 };
 610
 611 static struct of_device_id octeon_i2c_match[] = {
 612         {
 613                 .compatible = "cavium,octeon-3860-twsi",
 614         },
 615         {},
 616 };
 617 MODULE_DEVICE_TABLE(of, octeon_i2c_match);
 618
 619 static struct platform_driver octeon_i2c_driver = {
 620         .probe          = octeon_i2c_probe,
 621         .remove         = octeon_i2c_remove,
 622         .driver         = {
 623                 .name   = DRV_NAME,
 624                 .of_match_table = octeon_i2c_match,
 625         },
 626 };
 627
 628 module_platform_driver(octeon_i2c_driver);
 629
 630 MODULE_AUTHOR("Michael Lawnick <michael.lawnick.ext@nsn.com>");
 631 MODULE_DESCRIPTION("I2C-Bus adapter for Cavium OCTEON processors");
 632 MODULE_LICENSE("GPL");
 633 MODULE_VERSION(DRV_VERSION);