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         int 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: wait interrupted\n", __func__);
 215                 return result;
 216         } else if (result == 0) {
 217                 dev_dbg(i2c->dev, "%s: timeout\n", __func__);
 218                 return -ETIMEDOUT;
 219         }
 220
 221         return 0;
 222 }
 223
 224 /**
 225  * octeon_i2c_start - send START to the bus.
 226  * @i2c: The struct octeon_i2c.
 227  *
 228  * Returns 0 on success, otherwise a negative errno.
 229  */
 230 static int octeon_i2c_start(struct octeon_i2c *i2c)
 231 {
 232         u8 data;
 233         int result;
 234
 235         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 236                                 TWSI_CTL_ENAB | TWSI_CTL_STA);
 237
 238         result = octeon_i2c_wait(i2c);
 239         if (result) {
 240                 if (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT) == STAT_IDLE) {
 241                         /*
 242                          * Controller refused to send start flag May
 243                          * be a client is holding SDA low - let's try
 244                          * to free it.
 245                          */
 246                         octeon_i2c_unblock(i2c);
 247                         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 248                                             TWSI_CTL_ENAB | TWSI_CTL_STA);
 249
 250                         result = octeon_i2c_wait(i2c);
 251                 }
 252                 if (result)
 253                         return result;
 254         }
 255
 256         data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 257         if ((data != STAT_START) && (data != STAT_RSTART)) {
 258                 dev_err(i2c->dev, "%s: bad status (0x%x)\n", __func__, data);
 259                 return -EIO;
 260         }
 261
 262         return 0;
 263 }
 264
 265 /**
 266  * octeon_i2c_stop - send STOP to the bus.
 267  * @i2c: The struct octeon_i2c.
 268  *
 269  * Returns 0 on success, otherwise a negative errno.
 270  */
 271 static int octeon_i2c_stop(struct octeon_i2c *i2c)
 272 {
 273         u8 data;
 274
 275         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 276                             TWSI_CTL_ENAB | TWSI_CTL_STP);
 277
 278         data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 279
 280         if (data != STAT_IDLE) {
 281                 dev_err(i2c->dev, "%s: bad status(0x%x)\n", __func__, data);
 282                 return -EIO;
 283         }
 284         return 0;
 285 }
 286
 287 /**
 288  * octeon_i2c_write - send data to the bus.
 289  * @i2c: The struct octeon_i2c.
 290  * @target: Target address.
 291  * @data: Pointer to the data to be sent.
 292  * @length: Length of the data.
 293  *
 294  * The address is sent over the bus, then the data.
 295  *
 296  * Returns 0 on success, otherwise a negative errno.
 297  */
 298 static int octeon_i2c_write(struct octeon_i2c *i2c, int target,
 299                             const u8 *data, int length)
 300 {
 301         int i, result;
 302         u8 tmp;
 303
 304         result = octeon_i2c_start(i2c);
 305         if (result)
 306                 return result;
 307
 308         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, target << 1);
 309         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 310
 311         result = octeon_i2c_wait(i2c);
 312         if (result)
 313                 return result;
 314
 315         for (i = 0; i < length; i++) {
 316                 tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 317                 if ((tmp != STAT_TXADDR_ACK) && (tmp != STAT_TXDATA_ACK)) {
 318                         dev_err(i2c->dev,
 319                                 "%s: bad status before write (0x%x)\n",
 320                                 __func__, tmp);
 321                         return -EIO;
 322                 }
 323
 324                 octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, data[i]);
 325                 octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 326
 327                 result = octeon_i2c_wait(i2c);
 328                 if (result)
 329                         return result;
 330         }
 331
 332         return 0;
 333 }
 334
 335 /**
 336  * octeon_i2c_read - receive data from the bus.
 337  * @i2c: The struct octeon_i2c.
 338  * @target: Target address.
 339  * @data: Pointer to the location to store the datae .
 340  * @length: Length of the data.
 341  *
 342  * The address is sent over the bus, then the data is read.
 343  *
 344  * Returns 0 on success, otherwise a negative errno.
 345  */
 346 static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
 347                            u8 *data, int length)
 348 {
 349         int i, result;
 350         u8 tmp;
 351
 352         if (length < 1)
 353                 return -EINVAL;
 354
 355         result = octeon_i2c_start(i2c);
 356         if (result)
 357                 return result;
 358
 359         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, (target<<1) | 1);
 360         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 361
 362         result = octeon_i2c_wait(i2c);
 363         if (result)
 364                 return result;
 365
 366         for (i = 0; i < length; i++) {
 367                 tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 368                 if ((tmp != STAT_RXDATA_ACK) && (tmp != STAT_RXADDR_ACK)) {
 369                         dev_err(i2c->dev,
 370                                 "%s: bad status before read (0x%x)\n",
 371                                 __func__, tmp);
 372                         return -EIO;
 373                 }
 374
 375                 if (i+1 < length)
 376                         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 377                                                 TWSI_CTL_ENAB | TWSI_CTL_AAK);
 378                 else
 379                         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 380                                                 TWSI_CTL_ENAB);
 381
 382                 result = octeon_i2c_wait(i2c);
 383                 if (result)
 384                         return result;
 385
 386                 data[i] = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_DATA);
 387         }
 388         return 0;
 389 }
 390
 391 /**
 392  * octeon_i2c_xfer - The driver's master_xfer function.
 393  * @adap: Pointer to the i2c_adapter structure.
 394  * @msgs: Pointer to the messages to be processed.
 395  * @num: Length of the MSGS array.
 396  *
 397  * Returns the number of messages processed, or a negative errno on
 398  * failure.
 399  */
 400 static int octeon_i2c_xfer(struct i2c_adapter *adap,
 401                            struct i2c_msg *msgs,
 402                            int num)
 403 {
 404         struct i2c_msg *pmsg;
 405         int i;
 406         int ret = 0;
 407         struct octeon_i2c *i2c = i2c_get_adapdata(adap);
 408
 409         for (i = 0; ret == 0 && i < num; i++) {
 410                 pmsg = &msgs[i];
 411                 dev_dbg(i2c->dev,
 412                         "Doing %s %d byte(s) to/from 0x%02x - %d of %d messages\n",
 413                          pmsg->flags & I2C_M_RD ? "read" : "write",
 414                          pmsg->len, pmsg->addr, i + 1, num);
 415                 if (pmsg->flags & I2C_M_RD)
 416                         ret = octeon_i2c_read(i2c, pmsg->addr, pmsg->buf,
 417                                                 pmsg->len);
 418                 else
 419                         ret = octeon_i2c_write(i2c, pmsg->addr, pmsg->buf,
 420                                                 pmsg->len);
 421         }
 422         octeon_i2c_stop(i2c);
 423
 424         return (ret != 0) ? ret : num;
 425 }
 426
 427 static u32 octeon_i2c_functionality(struct i2c_adapter *adap)
 428 {
 429         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 430 }
 431
 432 static const struct i2c_algorithm octeon_i2c_algo = {
 433         .master_xfer = octeon_i2c_xfer,
 434         .functionality = octeon_i2c_functionality,
 435 };
 436
 437 static struct i2c_adapter octeon_i2c_ops = {
 438         .owner = THIS_MODULE,
 439         .name = "OCTEON adapter",
 440         .algo = &octeon_i2c_algo,
 441         .timeout = HZ / 50,
 442 };
 443
 444 /**
 445  * octeon_i2c_setclock - Calculate and set clock divisors.
 446  */
 447 static int octeon_i2c_setclock(struct octeon_i2c *i2c)
 448 {
 449         int tclk, thp_base, inc, thp_idx, mdiv_idx, ndiv_idx, foscl, diff;
 450         int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = 1000000;
 451
 452         for (ndiv_idx = 0; ndiv_idx < 8 && delta_hz != 0; ndiv_idx++) {
 453                 /*
 454                  * An mdiv value of less than 2 seems to not work well
 455                  * with ds1337 RTCs, so we constrain it to larger
 456                  * values.
 457                  */
 458                 for (mdiv_idx = 15; mdiv_idx >= 2 && delta_hz != 0; mdiv_idx--) {
 459                         /*
 460                          * For given ndiv and mdiv values check the
 461                          * two closest thp values.
 462                          */
 463                         tclk = i2c->twsi_freq * (mdiv_idx + 1) * 10;
 464                         tclk *= (1 << ndiv_idx);
 465                         thp_base = (i2c->sys_freq / (tclk * 2)) - 1;
 466                         for (inc = 0; inc <= 1; inc++) {
 467                                 thp_idx = thp_base + inc;
 468                                 if (thp_idx < 5 || thp_idx > 0xff)
 469                                         continue;
 470
 471                                 foscl = i2c->sys_freq / (2 * (thp_idx + 1));
 472                                 foscl = foscl / (1 << ndiv_idx);
 473                                 foscl = foscl / (mdiv_idx + 1) / 10;
 474                                 diff = abs(foscl - i2c->twsi_freq);
 475                                 if (diff < delta_hz) {
 476                                         delta_hz = diff;
 477                                         thp = thp_idx;
 478                                         mdiv = mdiv_idx;
 479                                         ndiv = ndiv_idx;
 480                                 }
 481                         }
 482                 }
 483         }
 484         octeon_i2c_write_sw(i2c, SW_TWSI_OP_TWSI_CLK, thp);
 485         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CLKCTL, (mdiv << 3) | ndiv);
 486
 487         return 0;
 488 }
 489
 490 static int octeon_i2c_initlowlevel(struct octeon_i2c *i2c)
 491 {
 492         u8 status;
 493         int tries;
 494
 495         /* disable high level controller, enable bus access */
 496         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 497
 498         /* reset controller */
 499         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_RST, 0);
 500
 501         for (tries = 10; tries; tries--) {
 502                 udelay(1);
 503                 status = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 504                 if (status == STAT_IDLE)
 505                         return 0;
 506         }
 507         dev_err(i2c->dev, "%s: TWSI_RST failed! (0x%x)\n", __func__, status);
 508         return -EIO;
 509 }
 510
 511 static int octeon_i2c_probe(struct platform_device *pdev)
 512 {
 513         int irq, result = 0;
 514         struct octeon_i2c *i2c;
 515         struct resource *res_mem;
 516
 517         /* All adaptors have an irq.  */
 518         irq = platform_get_irq(pdev, 0);
 519         if (irq < 0)
 520                 return irq;
 521
 522         i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
 523         if (!i2c) {
 524                 dev_err(&pdev->dev, "kzalloc failed\n");
 525                 result = -ENOMEM;
 526                 goto out;
 527         }
 528         i2c->dev = &pdev->dev;
 529
 530         res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 531
 532         if (res_mem == NULL) {
 533                 dev_err(i2c->dev, "found no memory resource\n");
 534                 result = -ENXIO;
 535                 goto out;
 536         }
 537         i2c->twsi_phys = res_mem->start;
 538         i2c->regsize = resource_size(res_mem);
 539
 540         /*
 541          * "clock-rate" is a legacy binding, the official binding is
 542          * "clock-frequency".  Try the official one first and then
 543          * fall back if it doesn't exist.
 544          */
 545         if (of_property_read_u32(pdev->dev.of_node,
 546                                  "clock-frequency", &i2c->twsi_freq) &&
 547             of_property_read_u32(pdev->dev.of_node,
 548                                  "clock-rate", &i2c->twsi_freq)) {
 549                 dev_err(i2c->dev,
 550                         "no I2C 'clock-rate' or 'clock-frequency' property\n");
 551                 result = -ENXIO;
 552                 goto out;
 553         }
 554
 555         i2c->sys_freq = octeon_get_io_clock_rate();
 556
 557         if (!devm_request_mem_region(&pdev->dev, i2c->twsi_phys, i2c->regsize,
 558                                       res_mem->name)) {
 559                 dev_err(i2c->dev, "request_mem_region failed\n");
 560                 goto out;
 561         }
 562         i2c->twsi_base = devm_ioremap(&pdev->dev, i2c->twsi_phys, i2c->regsize);
 563
 564         init_waitqueue_head(&i2c->queue);
 565
 566         i2c->irq = irq;
 567
 568         result = devm_request_irq(&pdev->dev, i2c->irq,
 569                                   octeon_i2c_isr, 0, DRV_NAME, i2c);
 570         if (result < 0) {
 571                 dev_err(i2c->dev, "failed to attach interrupt\n");
 572                 goto out;
 573         }
 574
 575         result = octeon_i2c_initlowlevel(i2c);
 576         if (result) {
 577                 dev_err(i2c->dev, "init low level failed\n");
 578                 goto  out;
 579         }
 580
 581         result = octeon_i2c_setclock(i2c);
 582         if (result) {
 583                 dev_err(i2c->dev, "clock init failed\n");
 584                 goto  out;
 585         }
 586
 587         i2c->adap = octeon_i2c_ops;
 588         i2c->adap.dev.parent = &pdev->dev;
 589         i2c->adap.dev.of_node = pdev->dev.of_node;
 590         i2c_set_adapdata(&i2c->adap, i2c);
 591         platform_set_drvdata(pdev, i2c);
 592
 593         result = i2c_add_adapter(&i2c->adap);
 594         if (result < 0) {
 595                 dev_err(i2c->dev, "failed to add adapter\n");
 596                 goto out;
 597         }
 598         dev_info(i2c->dev, "version %s\n", DRV_VERSION);
 599
 600         return 0;
 601
 602 out:
 603         return result;
 604 };
 605
 606 static int octeon_i2c_remove(struct platform_device *pdev)
 607 {
 608         struct octeon_i2c *i2c = platform_get_drvdata(pdev);
 609
 610         i2c_del_adapter(&i2c->adap);
 611         return 0;
 612 };
 613
 614 static struct of_device_id octeon_i2c_match[] = {
 615         {
 616                 .compatible = "cavium,octeon-3860-twsi",
 617         },
 618         {},
 619 };
 620 MODULE_DEVICE_TABLE(of, octeon_i2c_match);
 621
 622 static struct platform_driver octeon_i2c_driver = {
 623         .probe          = octeon_i2c_probe,
 624         .remove         = octeon_i2c_remove,
 625         .driver         = {
 626                 .name   = DRV_NAME,
 627                 .of_match_table = octeon_i2c_match,
 628         },
 629 };
 630
 631 module_platform_driver(octeon_i2c_driver);
 632
 633 MODULE_AUTHOR("Michael Lawnick <michael.lawnick.ext@nsn.com>");
 634 MODULE_DESCRIPTION("I2C-Bus adapter for Cavium OCTEON processors");
 635 MODULE_LICENSE("GPL");
 636 MODULE_VERSION(DRV_VERSION);