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 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/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/init.h>
  19
  20 #include <linux/io.h>
  21 #include <linux/i2c.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/delay.h>
  24 #include <linux/platform_device.h>
  25
  26 #include <asm/octeon/octeon.h>
  27
  28 #define DRV_NAME "i2c-octeon"
  29
  30 /* The previous out-of-tree version was implicitly version 1.0. */
  31 #define DRV_VERSION     "2.0"
  32
  33 /* register offsets */
  34 #define SW_TWSI  0x00
  35 #define TWSI_INT 0x10
  36
  37 /* Controller command patterns */
  38 #define SW_TWSI_V               0x8000000000000000ull
  39 #define SW_TWSI_EOP_TWSI_DATA   0x0C00000100000000ull
  40 #define SW_TWSI_EOP_TWSI_CTL    0x0C00000200000000ull
  41 #define SW_TWSI_EOP_TWSI_CLKCTL 0x0C00000300000000ull
  42 #define SW_TWSI_EOP_TWSI_STAT   0x0C00000300000000ull
  43 #define SW_TWSI_EOP_TWSI_RST    0x0C00000700000000ull
  44 #define SW_TWSI_OP_TWSI_CLK     0x0800000000000000ull
  45 #define SW_TWSI_R               0x0100000000000000ull
  46
  47 /* Controller command and status bits */
  48 #define TWSI_CTL_CE   0x80
  49 #define TWSI_CTL_ENAB 0x40
  50 #define TWSI_CTL_STA  0x20
  51 #define TWSI_CTL_STP  0x10
  52 #define TWSI_CTL_IFLG 0x08
  53 #define TWSI_CTL_AAK  0x04
  54
  55 /* Some status values */
  56 #define STAT_START      0x08
  57 #define STAT_RSTART     0x10
  58 #define STAT_TXADDR_ACK 0x18
  59 #define STAT_TXDATA_ACK 0x28
  60 #define STAT_RXADDR_ACK 0x40
  61 #define STAT_RXDATA_ACK 0x50
  62 #define STAT_IDLE       0xF8
  63
  64 struct octeon_i2c {
  65         wait_queue_head_t queue;
  66         struct i2c_adapter adap;
  67         int irq;
  68         int twsi_freq;
  69         int sys_freq;
  70         resource_size_t twsi_phys;
  71         void __iomem *twsi_base;
  72         resource_size_t regsize;
  73         struct device *dev;
  74 };
  75
  76 /**
  77  * octeon_i2c_write_sw - write an I2C core register.
  78  * @i2c: The struct octeon_i2c.
  79  * @eop_reg: Register selector.
  80  * @data: Value to be written.
  81  *
  82  * The I2C core registers are accessed indirectly via the SW_TWSI CSR.
  83  */
  84 static void octeon_i2c_write_sw(struct octeon_i2c *i2c,
  85                                 u64 eop_reg,
  86                                 u8 data)
  87 {
  88         u64 tmp;
  89
  90         __raw_writeq(SW_TWSI_V | eop_reg | data, i2c->twsi_base + SW_TWSI);
  91         do {
  92                 tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
  93         } while ((tmp & SW_TWSI_V) != 0);
  94 }
  95
  96 /**
  97  * octeon_i2c_read_sw - write an I2C core register.
  98  * @i2c: The struct octeon_i2c.
  99  * @eop_reg: Register selector.
 100  *
 101  * Returns the data.
 102  *
 103  * The I2C core registers are accessed indirectly via the SW_TWSI CSR.
 104  */
 105 static u8 octeon_i2c_read_sw(struct octeon_i2c *i2c, u64 eop_reg)
 106 {
 107         u64 tmp;
 108
 109         __raw_writeq(SW_TWSI_V | eop_reg | SW_TWSI_R, i2c->twsi_base + SW_TWSI);
 110         do {
 111                 tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
 112         } while ((tmp & SW_TWSI_V) != 0);
 113
 114         return tmp & 0xFF;
 115 }
 116
 117 /**
 118  * octeon_i2c_write_int - write the TWSI_INT register
 119  * @i2c: The struct octeon_i2c.
 120  * @data: Value to be written.
 121  */
 122 static void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
 123 {
 124         u64 tmp;
 125
 126         __raw_writeq(data, i2c->twsi_base + TWSI_INT);
 127         tmp = __raw_readq(i2c->twsi_base + TWSI_INT);
 128 }
 129
 130 /**
 131  * octeon_i2c_int_enable - enable the TS interrupt.
 132  * @i2c: The struct octeon_i2c.
 133  *
 134  * The interrupt will be asserted when there is non-STAT_IDLE state in
 135  * the SW_TWSI_EOP_TWSI_STAT register.
 136  */
 137 static void octeon_i2c_int_enable(struct octeon_i2c *i2c)
 138 {
 139         octeon_i2c_write_int(i2c, 0x40);
 140 }
 141
 142 /**
 143  * octeon_i2c_int_disable - disable the TS interrupt.
 144  * @i2c: The struct octeon_i2c.
 145  */
 146 static void octeon_i2c_int_disable(struct octeon_i2c *i2c)
 147 {
 148         octeon_i2c_write_int(i2c, 0);
 149 }
 150
 151 /**
 152  * octeon_i2c_unblock - unblock the bus.
 153  * @i2c: The struct octeon_i2c.
 154  *
 155  * If there was a reset while a device was driving 0 to bus,
 156  * bus is blocked. We toggle it free manually by some clock
 157  * cycles and send a stop.
 158  */
 159 static void octeon_i2c_unblock(struct octeon_i2c *i2c)
 160 {
 161         int i;
 162
 163         dev_dbg(i2c->dev, "%s\n", __func__);
 164         for (i = 0; i < 9; i++) {
 165                 octeon_i2c_write_int(i2c, 0x0);
 166                 udelay(5);
 167                 octeon_i2c_write_int(i2c, 0x200);
 168                 udelay(5);
 169         }
 170         octeon_i2c_write_int(i2c, 0x300);
 171         udelay(5);
 172         octeon_i2c_write_int(i2c, 0x100);
 173         udelay(5);
 174         octeon_i2c_write_int(i2c, 0x0);
 175 }
 176
 177 /**
 178  * octeon_i2c_isr - the interrupt service routine.
 179  * @int: The irq, unused.
 180  * @dev_id: Our struct octeon_i2c.
 181  */
 182 static irqreturn_t octeon_i2c_isr(int irq, void *dev_id)
 183 {
 184         struct octeon_i2c *i2c = dev_id;
 185
 186         octeon_i2c_int_disable(i2c);
 187         wake_up_interruptible(&i2c->queue);
 188
 189         return IRQ_HANDLED;
 190 }
 191
 192
 193 static int octeon_i2c_test_iflg(struct octeon_i2c *i2c)
 194 {
 195         return (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_CTL) & TWSI_CTL_IFLG) != 0;
 196 }
 197
 198 /**
 199  * octeon_i2c_wait - wait for the IFLG to be set.
 200  * @i2c: The struct octeon_i2c.
 201  *
 202  * Returns 0 on success, otherwise a negative errno.
 203  */
 204 static int octeon_i2c_wait(struct octeon_i2c *i2c)
 205 {
 206         int result;
 207
 208         octeon_i2c_int_enable(i2c);
 209
 210         result = wait_event_interruptible_timeout(i2c->queue,
 211                                                   octeon_i2c_test_iflg(i2c),
 212                                                   i2c->adap.timeout);
 213
 214         octeon_i2c_int_disable(i2c);
 215
 216         if (result < 0) {
 217                 dev_dbg(i2c->dev, "%s: wait interrupted\n", __func__);
 218                 return result;
 219         } else if (result == 0) {
 220                 dev_dbg(i2c->dev, "%s: timeout\n", __func__);
 221                 result = -ETIMEDOUT;
 222         }
 223
 224         return 0;
 225 }
 226
 227 /**
 228  * octeon_i2c_start - send START to the bus.
 229  * @i2c: The struct octeon_i2c.
 230  *
 231  * Returns 0 on success, otherwise a negative errno.
 232  */
 233 static int octeon_i2c_start(struct octeon_i2c *i2c)
 234 {
 235         u8 data;
 236         int result;
 237
 238         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 239                                 TWSI_CTL_ENAB | TWSI_CTL_STA);
 240
 241         result = octeon_i2c_wait(i2c);
 242         if (result) {
 243                 if (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT) == STAT_IDLE) {
 244                         /*
 245                          * Controller refused to send start flag May
 246                          * be a client is holding SDA low - let's try
 247                          * to free it.
 248                          */
 249                         octeon_i2c_unblock(i2c);
 250                         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 251                                             TWSI_CTL_ENAB | TWSI_CTL_STA);
 252
 253                         result = octeon_i2c_wait(i2c);
 254                 }
 255                 if (result)
 256                         return result;
 257         }
 258
 259         data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 260         if ((data != STAT_START) && (data != STAT_RSTART)) {
 261                 dev_err(i2c->dev, "%s: bad status (0x%x)\n", __func__, data);
 262                 return -EIO;
 263         }
 264
 265         return 0;
 266 }
 267
 268 /**
 269  * octeon_i2c_stop - send STOP to the bus.
 270  * @i2c: The struct octeon_i2c.
 271  *
 272  * Returns 0 on success, otherwise a negative errno.
 273  */
 274 static int octeon_i2c_stop(struct octeon_i2c *i2c)
 275 {
 276         u8 data;
 277
 278         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 279                             TWSI_CTL_ENAB | TWSI_CTL_STP);
 280
 281         data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 282
 283         if (data != STAT_IDLE) {
 284                 dev_err(i2c->dev, "%s: bad status(0x%x)\n", __func__, data);
 285                 return -EIO;
 286         }
 287         return 0;
 288 }
 289
 290 /**
 291  * octeon_i2c_write - send data to the bus.
 292  * @i2c: The struct octeon_i2c.
 293  * @target: Target address.
 294  * @data: Pointer to the data to be sent.
 295  * @length: Length of the data.
 296  *
 297  * The address is sent over the bus, then the data.
 298  *
 299  * Returns 0 on success, otherwise a negative errno.
 300  */
 301 static int octeon_i2c_write(struct octeon_i2c *i2c, int target,
 302                             const u8 *data, int length)
 303 {
 304         int i, result;
 305         u8 tmp;
 306
 307         result = octeon_i2c_start(i2c);
 308         if (result)
 309                 return result;
 310
 311         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, target << 1);
 312         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 313
 314         result = octeon_i2c_wait(i2c);
 315         if (result)
 316                 return result;
 317
 318         for (i = 0; i < length; i++) {
 319                 tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 320                 if ((tmp != STAT_TXADDR_ACK) && (tmp != STAT_TXDATA_ACK)) {
 321                         dev_err(i2c->dev,
 322                                 "%s: bad status before write (0x%x)\n",
 323                                 __func__, tmp);
 324                         return -EIO;
 325                 }
 326
 327                 octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, data[i]);
 328                 octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 329
 330                 result = octeon_i2c_wait(i2c);
 331                 if (result)
 332                         return result;
 333         }
 334
 335         return 0;
 336 }
 337
 338 /**
 339  * octeon_i2c_read - receive data from the bus.
 340  * @i2c: The struct octeon_i2c.
 341  * @target: Target address.
 342  * @data: Pointer to the location to store the datae .
 343  * @length: Length of the data.
 344  *
 345  * The address is sent over the bus, then the data is read.
 346  *
 347  * Returns 0 on success, otherwise a negative errno.
 348  */
 349 static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
 350                            u8 *data, int length)
 351 {
 352         int i, result;
 353         u8 tmp;
 354
 355         if (length < 1)
 356                 return -EINVAL;
 357
 358         result = octeon_i2c_start(i2c);
 359         if (result)
 360                 return result;
 361
 362         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, (target<<1) | 1);
 363         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 364
 365         result = octeon_i2c_wait(i2c);
 366         if (result)
 367                 return result;
 368
 369         for (i = 0; i < length; i++) {
 370                 tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 371                 if ((tmp != STAT_RXDATA_ACK) && (tmp != STAT_RXADDR_ACK)) {
 372                         dev_err(i2c->dev,
 373                                 "%s: bad status before read (0x%x)\n",
 374                                 __func__, tmp);
 375                         return -EIO;
 376                 }
 377
 378                 if (i+1 < length)
 379                         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 380                                                 TWSI_CTL_ENAB | TWSI_CTL_AAK);
 381                 else
 382                         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
 383                                                 TWSI_CTL_ENAB);
 384
 385                 result = octeon_i2c_wait(i2c);
 386                 if (result)
 387                         return result;
 388
 389                 data[i] = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_DATA);
 390         }
 391         return 0;
 392 }
 393
 394 /**
 395  * octeon_i2c_xfer - The driver's master_xfer function.
 396  * @adap: Pointer to the i2c_adapter structure.
 397  * @msgs: Pointer to the messages to be processed.
 398  * @num: Length of the MSGS array.
 399  *
 400  * Returns the number of messages processed, or a negative errno on
 401  * failure.
 402  */
 403 static int octeon_i2c_xfer(struct i2c_adapter *adap,
 404                            struct i2c_msg *msgs,
 405                            int num)
 406 {
 407         struct i2c_msg *pmsg;
 408         int i;
 409         int ret = 0;
 410         struct octeon_i2c *i2c = i2c_get_adapdata(adap);
 411
 412         for (i = 0; ret == 0 && i < num; i++) {
 413                 pmsg = &msgs[i];
 414                 dev_dbg(i2c->dev,
 415                         "Doing %s %d byte(s) to/from 0x%02x - %d of %d messages\n",
 416                          pmsg->flags & I2C_M_RD ? "read" : "write",
 417                          pmsg->len, pmsg->addr, i + 1, num);
 418                 if (pmsg->flags & I2C_M_RD)
 419                         ret = octeon_i2c_read(i2c, pmsg->addr, pmsg->buf,
 420                                                 pmsg->len);
 421                 else
 422                         ret = octeon_i2c_write(i2c, pmsg->addr, pmsg->buf,
 423                                                 pmsg->len);
 424         }
 425         octeon_i2c_stop(i2c);
 426
 427         return (ret != 0) ? ret : num;
 428 }
 429
 430 static u32 octeon_i2c_functionality(struct i2c_adapter *adap)
 431 {
 432         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 433 }
 434
 435 static const struct i2c_algorithm octeon_i2c_algo = {
 436         .master_xfer = octeon_i2c_xfer,
 437         .functionality = octeon_i2c_functionality,
 438 };
 439
 440 static struct i2c_adapter octeon_i2c_ops = {
 441         .owner = THIS_MODULE,
 442         .name = "OCTEON adapter",
 443         .algo = &octeon_i2c_algo,
 444         .timeout = 2,
 445 };
 446
 447 /**
 448  * octeon_i2c_setclock - Calculate and set clock divisors.
 449  */
 450 static int __init octeon_i2c_setclock(struct octeon_i2c *i2c)
 451 {
 452         int tclk, thp_base, inc, thp_idx, mdiv_idx, ndiv_idx, foscl, diff;
 453         int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = 1000000;
 454
 455         for (ndiv_idx = 0; ndiv_idx < 8 && delta_hz != 0; ndiv_idx++) {
 456                 /*
 457                  * An mdiv value of less than 2 seems to not work well
 458                  * with ds1337 RTCs, so we constrain it to larger
 459                  * values.
 460                  */
 461                 for (mdiv_idx = 15; mdiv_idx >= 2 && delta_hz != 0; mdiv_idx--) {
 462                         /*
 463                          * For given ndiv and mdiv values check the
 464                          * two closest thp values.
 465                          */
 466                         tclk = i2c->twsi_freq * (mdiv_idx + 1) * 10;
 467                         tclk *= (1 << ndiv_idx);
 468                         thp_base = (i2c->sys_freq / (tclk * 2)) - 1;
 469                         for (inc = 0; inc <= 1; inc++) {
 470                                 thp_idx = thp_base + inc;
 471                                 if (thp_idx < 5 || thp_idx > 0xff)
 472                                         continue;
 473
 474                                 foscl = i2c->sys_freq / (2 * (thp_idx + 1));
 475                                 foscl = foscl / (1 << ndiv_idx);
 476                                 foscl = foscl / (mdiv_idx + 1) / 10;
 477                                 diff = abs(foscl - i2c->twsi_freq);
 478                                 if (diff < delta_hz) {
 479                                         delta_hz = diff;
 480                                         thp = thp_idx;
 481                                         mdiv = mdiv_idx;
 482                                         ndiv = ndiv_idx;
 483                                 }
 484                         }
 485                 }
 486         }
 487         octeon_i2c_write_sw(i2c, SW_TWSI_OP_TWSI_CLK, thp);
 488         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CLKCTL, (mdiv << 3) | ndiv);
 489
 490         return 0;
 491 }
 492
 493 static int __init octeon_i2c_initlowlevel(struct octeon_i2c *i2c)
 494 {
 495         u8 status;
 496         int tries;
 497
 498         /* disable high level controller, enable bus access */
 499         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
 500
 501         /* reset controller */
 502         octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_RST, 0);
 503
 504         for (tries = 10; tries; tries--) {
 505                 udelay(1);
 506                 status = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
 507                 if (status == STAT_IDLE)
 508                         return 0;
 509         }
 510         dev_err(i2c->dev, "%s: TWSI_RST failed! (0x%x)\n", __func__, status);
 511         return -EIO;
 512 }
 513
 514 static int __devinit octeon_i2c_probe(struct platform_device *pdev)
 515 {
 516         int irq, result = 0;
 517         struct octeon_i2c *i2c;
 518         struct octeon_i2c_data *i2c_data;
 519         struct resource *res_mem;
 520
 521         /* All adaptors have an irq.  */
 522         irq = platform_get_irq(pdev, 0);
 523         if (irq < 0)
 524                 return irq;
 525
 526         i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
 527         if (!i2c) {
 528                 dev_err(&pdev->dev, "kzalloc failed\n");
 529                 result = -ENOMEM;
 530                 goto out;
 531         }
 532         i2c->dev = &pdev->dev;
 533         i2c_data = pdev->dev.platform_data;
 534
 535         res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 536
 537         if (res_mem == NULL) {
 538                 dev_err(i2c->dev, "found no memory resource\n");
 539                 result = -ENXIO;
 540                 goto fail_region;
 541         }
 542
 543         if (i2c_data == NULL) {
 544                 dev_err(i2c->dev, "no I2C frequency data\n");
 545                 result = -ENXIO;
 546                 goto fail_region;
 547         }
 548
 549         i2c->twsi_phys = res_mem->start;
 550         i2c->regsize = resource_size(res_mem);
 551         i2c->twsi_freq = i2c_data->i2c_freq;
 552         i2c->sys_freq = i2c_data->sys_freq;
 553
 554         if (!request_mem_region(i2c->twsi_phys, i2c->regsize, res_mem->name)) {
 555                 dev_err(i2c->dev, "request_mem_region failed\n");
 556                 goto fail_region;
 557         }
 558         i2c->twsi_base = ioremap(i2c->twsi_phys, i2c->regsize);
 559
 560         init_waitqueue_head(&i2c->queue);
 561
 562         i2c->irq = irq;
 563
 564         result = request_irq(i2c->irq, octeon_i2c_isr, 0, DRV_NAME, i2c);
 565         if (result < 0) {
 566                 dev_err(i2c->dev, "failed to attach interrupt\n");
 567                 goto fail_irq;
 568         }
 569
 570         result = octeon_i2c_initlowlevel(i2c);
 571         if (result) {
 572                 dev_err(i2c->dev, "init low level failed\n");
 573                 goto  fail_add;
 574         }
 575
 576         result = octeon_i2c_setclock(i2c);
 577         if (result) {
 578                 dev_err(i2c->dev, "clock init failed\n");
 579                 goto  fail_add;
 580         }
 581
 582         i2c->adap = octeon_i2c_ops;
 583         i2c->adap.dev.parent = &pdev->dev;
 584         i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0;
 585         i2c_set_adapdata(&i2c->adap, i2c);
 586         platform_set_drvdata(pdev, i2c);
 587
 588         result = i2c_add_numbered_adapter(&i2c->adap);
 589         if (result < 0) {
 590                 dev_err(i2c->dev, "failed to add adapter\n");
 591                 goto fail_add;
 592         }
 593
 594         dev_info(i2c->dev, "version %s\n", DRV_VERSION);
 595
 596         return result;
 597
 598 fail_add:
 599         platform_set_drvdata(pdev, NULL);
 600         free_irq(i2c->irq, i2c);
 601 fail_irq:
 602         iounmap(i2c->twsi_base);
 603         release_mem_region(i2c->twsi_phys, i2c->regsize);
 604 fail_region:
 605         kfree(i2c);
 606 out:
 607         return result;
 608 };
 609
 610 static int __devexit octeon_i2c_remove(struct platform_device *pdev)
 611 {
 612         struct octeon_i2c *i2c = platform_get_drvdata(pdev);
 613
 614         i2c_del_adapter(&i2c->adap);
 615         platform_set_drvdata(pdev, NULL);
 616         free_irq(i2c->irq, i2c);
 617         iounmap(i2c->twsi_base);
 618         release_mem_region(i2c->twsi_phys, i2c->regsize);
 619         kfree(i2c);
 620         return 0;
 621 };
 622
 623 static struct platform_driver octeon_i2c_driver = {
 624         .probe          = octeon_i2c_probe,
 625         .remove         = __devexit_p(octeon_i2c_remove),
 626         .driver         = {
 627                 .owner  = THIS_MODULE,
 628                 .name   = DRV_NAME,
 629         },
 630 };
 631
 632 static int __init octeon_i2c_init(void)
 633 {
 634         int rv;
 635
 636         rv = platform_driver_register(&octeon_i2c_driver);
 637         return rv;
 638 }
 639
 640 static void __exit octeon_i2c_exit(void)
 641 {
 642         platform_driver_unregister(&octeon_i2c_driver);
 643 }
 644
 645 MODULE_AUTHOR("Michael Lawnick <michael.lawnick.ext@nsn.com>");
 646 MODULE_DESCRIPTION("I2C-Bus adapter for Cavium OCTEON processors");
 647 MODULE_LICENSE("GPL");
 648 MODULE_VERSION(DRV_VERSION);
 649 MODULE_ALIAS("platform:" DRV_NAME);
 650
 651 module_init(octeon_i2c_init);
 652 module_exit(octeon_i2c_exit);