git.oblomov.eu Git - linux-2.6/blob - drivers/i2c/busses/i2c-mv64xxx.c

   1 /*
   2  * Driver for the i2c controller on the Marvell line of host bridges for MIPS
   3  * and PPC (e.g, gt642[46]0, mv643[46]0, mv644[46]0).
   4  *
   5  * Author: Mark A. Greer <mgreer@mvista.com>
   6  *
   7  * 2005 (c) MontaVista, Software, Inc.  This file is licensed under
   8  * the terms of the GNU General Public License version 2.  This program
   9  * is licensed "as is" without any warranty of any kind, whether express
  10  * or implied.
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/mv643xx.h>
  18 #include <linux/platform_device.h>
  19
  20 #include <asm/io.h>
  21
  22 /* Register defines */
  23 #define MV64XXX_I2C_REG_SLAVE_ADDR                      0x00
  24 #define MV64XXX_I2C_REG_DATA                            0x04
  25 #define MV64XXX_I2C_REG_CONTROL                         0x08
  26 #define MV64XXX_I2C_REG_STATUS                          0x0c
  27 #define MV64XXX_I2C_REG_BAUD                            0x0c
  28 #define MV64XXX_I2C_REG_EXT_SLAVE_ADDR                  0x10
  29 #define MV64XXX_I2C_REG_SOFT_RESET                      0x1c
  30
  31 #define MV64XXX_I2C_REG_CONTROL_ACK                     0x00000004
  32 #define MV64XXX_I2C_REG_CONTROL_IFLG                    0x00000008
  33 #define MV64XXX_I2C_REG_CONTROL_STOP                    0x00000010
  34 #define MV64XXX_I2C_REG_CONTROL_START                   0x00000020
  35 #define MV64XXX_I2C_REG_CONTROL_TWSIEN                  0x00000040
  36 #define MV64XXX_I2C_REG_CONTROL_INTEN                   0x00000080
  37
  38 /* Ctlr status values */
  39 #define MV64XXX_I2C_STATUS_BUS_ERR                      0x00
  40 #define MV64XXX_I2C_STATUS_MAST_START                   0x08
  41 #define MV64XXX_I2C_STATUS_MAST_REPEAT_START            0x10
  42 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK             0x18
  43 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK          0x20
  44 #define MV64XXX_I2C_STATUS_MAST_WR_ACK                  0x28
  45 #define MV64XXX_I2C_STATUS_MAST_WR_NO_ACK               0x30
  46 #define MV64XXX_I2C_STATUS_MAST_LOST_ARB                0x38
  47 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK             0x40
  48 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK          0x48
  49 #define MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK             0x50
  50 #define MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK          0x58
  51 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK           0xd0
  52 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_NO_ACK        0xd8
  53 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK           0xe0
  54 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_NO_ACK        0xe8
  55 #define MV64XXX_I2C_STATUS_NO_STATUS                    0xf8
  56
  57 /* Driver states */
  58 enum {
  59         MV64XXX_I2C_STATE_INVALID,
  60         MV64XXX_I2C_STATE_IDLE,
  61         MV64XXX_I2C_STATE_WAITING_FOR_START_COND,
  62         MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK,
  63         MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK,
  64         MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK,
  65         MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA,
  66 };
  67
  68 /* Driver actions */
  69 enum {
  70         MV64XXX_I2C_ACTION_INVALID,
  71         MV64XXX_I2C_ACTION_CONTINUE,
  72         MV64XXX_I2C_ACTION_SEND_START,
  73         MV64XXX_I2C_ACTION_SEND_ADDR_1,
  74         MV64XXX_I2C_ACTION_SEND_ADDR_2,
  75         MV64XXX_I2C_ACTION_SEND_DATA,
  76         MV64XXX_I2C_ACTION_RCV_DATA,
  77         MV64XXX_I2C_ACTION_RCV_DATA_STOP,
  78         MV64XXX_I2C_ACTION_SEND_STOP,
  79 };
  80
  81 struct mv64xxx_i2c_data {
  82         int                     irq;
  83         u32                     state;
  84         u32                     action;
  85         u32                     aborting;
  86         u32                     cntl_bits;
  87         void __iomem            *reg_base;
  88         u32                     reg_base_p;
  89         u32                     addr1;
  90         u32                     addr2;
  91         u32                     bytes_left;
  92         u32                     byte_posn;
  93         u32                     block;
  94         int                     rc;
  95         u32                     freq_m;
  96         u32                     freq_n;
  97         wait_queue_head_t       waitq;
  98         spinlock_t              lock;
  99         struct i2c_msg          *msg;
 100         struct i2c_adapter      adapter;
 101 };
 102
 103 /*
 104  *****************************************************************************
 105  *
 106  *      Finite State Machine & Interrupt Routines
 107  *
 108  *****************************************************************************
 109  */
 110 static void
 111 mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
 112 {
 113         /*
 114          * If state is idle, then this is likely the remnants of an old
 115          * operation that driver has given up on or the user has killed.
 116          * If so, issue the stop condition and go to idle.
 117          */
 118         if (drv_data->state == MV64XXX_I2C_STATE_IDLE) {
 119                 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 120                 return;
 121         }
 122
 123         /* The status from the ctlr [mostly] tells us what to do next */
 124         switch (status) {
 125         /* Start condition interrupt */
 126         case MV64XXX_I2C_STATUS_MAST_START: /* 0x08 */
 127         case MV64XXX_I2C_STATUS_MAST_REPEAT_START: /* 0x10 */
 128                 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1;
 129                 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK;
 130                 break;
 131
 132         /* Performing a write */
 133         case MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK: /* 0x18 */
 134                 if (drv_data->msg->flags & I2C_M_TEN) {
 135                         drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
 136                         drv_data->state =
 137                                 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
 138                         break;
 139                 }
 140                 /* FALLTHRU */
 141         case MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK: /* 0xd0 */
 142         case MV64XXX_I2C_STATUS_MAST_WR_ACK: /* 0x28 */
 143                 if ((drv_data->bytes_left == 0)
 144                                 || (drv_data->aborting
 145                                         && (drv_data->byte_posn != 0))) {
 146                         drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 147                         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 148                 } else {
 149                         drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
 150                         drv_data->state =
 151                                 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
 152                         drv_data->bytes_left--;
 153                 }
 154                 break;
 155
 156         /* Performing a read */
 157         case MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK: /* 40 */
 158                 if (drv_data->msg->flags & I2C_M_TEN) {
 159                         drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
 160                         drv_data->state =
 161                                 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
 162                         break;
 163                 }
 164                 /* FALLTHRU */
 165         case MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK: /* 0xe0 */
 166                 if (drv_data->bytes_left == 0) {
 167                         drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 168                         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 169                         break;
 170                 }
 171                 /* FALLTHRU */
 172         case MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK: /* 0x50 */
 173                 if (status != MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK)
 174                         drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
 175                 else {
 176                         drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA;
 177                         drv_data->bytes_left--;
 178                 }
 179                 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
 180
 181                 if ((drv_data->bytes_left == 1) || drv_data->aborting)
 182                         drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_ACK;
 183                 break;
 184
 185         case MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK: /* 0x58 */
 186                 drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA_STOP;
 187                 drv_data->state = MV64XXX_I2C_STATE_IDLE;
 188                 break;
 189
 190         case MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK: /* 0x20 */
 191         case MV64XXX_I2C_STATUS_MAST_WR_NO_ACK: /* 30 */
 192         case MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK: /* 48 */
 193                 /* Doesn't seem to be a device at other end */
 194                 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 195                 drv_data->state = MV64XXX_I2C_STATE_IDLE;
 196                 drv_data->rc = -ENODEV;
 197                 break;
 198
 199         default:
 200                 dev_err(&drv_data->adapter.dev,
 201                         "mv64xxx_i2c_fsm: Ctlr Error -- state: 0x%x, "
 202                         "status: 0x%x, addr: 0x%x, flags: 0x%x\n",
 203                          drv_data->state, status, drv_data->msg->addr,
 204                          drv_data->msg->flags);
 205                 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 206                 drv_data->state = MV64XXX_I2C_STATE_IDLE;
 207                 drv_data->rc = -EIO;
 208         }
 209 }
 210
 211 static void
 212 mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
 213 {
 214         switch(drv_data->action) {
 215         case MV64XXX_I2C_ACTION_CONTINUE:
 216                 writel(drv_data->cntl_bits,
 217                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 218                 break;
 219
 220         case MV64XXX_I2C_ACTION_SEND_START:
 221                 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
 222                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 223                 break;
 224
 225         case MV64XXX_I2C_ACTION_SEND_ADDR_1:
 226                 writel(drv_data->addr1,
 227                         drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 228                 writel(drv_data->cntl_bits,
 229                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 230                 break;
 231
 232         case MV64XXX_I2C_ACTION_SEND_ADDR_2:
 233                 writel(drv_data->addr2,
 234                         drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 235                 writel(drv_data->cntl_bits,
 236                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 237                 break;
 238
 239         case MV64XXX_I2C_ACTION_SEND_DATA:
 240                 writel(drv_data->msg->buf[drv_data->byte_posn++],
 241                         drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 242                 writel(drv_data->cntl_bits,
 243                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 244                 break;
 245
 246         case MV64XXX_I2C_ACTION_RCV_DATA:
 247                 drv_data->msg->buf[drv_data->byte_posn++] =
 248                         readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 249                 writel(drv_data->cntl_bits,
 250                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 251                 break;
 252
 253         case MV64XXX_I2C_ACTION_RCV_DATA_STOP:
 254                 drv_data->msg->buf[drv_data->byte_posn++] =
 255                         readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 256                 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
 257                 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
 258                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 259                 drv_data->block = 0;
 260                 wake_up_interruptible(&drv_data->waitq);
 261                 break;
 262
 263         case MV64XXX_I2C_ACTION_INVALID:
 264         default:
 265                 dev_err(&drv_data->adapter.dev,
 266                         "mv64xxx_i2c_do_action: Invalid action: %d\n",
 267                         drv_data->action);
 268                 drv_data->rc = -EIO;
 269                 /* FALLTHRU */
 270         case MV64XXX_I2C_ACTION_SEND_STOP:
 271                 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
 272                 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
 273                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 274                 drv_data->block = 0;
 275                 wake_up_interruptible(&drv_data->waitq);
 276                 break;
 277         }
 278 }
 279
 280 static int
 281 mv64xxx_i2c_intr(int irq, void *dev_id)
 282 {
 283         struct mv64xxx_i2c_data *drv_data = dev_id;
 284         unsigned long   flags;
 285         u32             status;
 286         int             rc = IRQ_NONE;
 287
 288         spin_lock_irqsave(&drv_data->lock, flags);
 289         while (readl(drv_data->reg_base + MV64XXX_I2C_REG_CONTROL) &
 290                                                 MV64XXX_I2C_REG_CONTROL_IFLG) {
 291                 status = readl(drv_data->reg_base + MV64XXX_I2C_REG_STATUS);
 292                 mv64xxx_i2c_fsm(drv_data, status);
 293                 mv64xxx_i2c_do_action(drv_data);
 294                 rc = IRQ_HANDLED;
 295         }
 296         spin_unlock_irqrestore(&drv_data->lock, flags);
 297
 298         return rc;
 299 }
 300
 301 /*
 302  *****************************************************************************
 303  *
 304  *      I2C Msg Execution Routines
 305  *
 306  *****************************************************************************
 307  */
 308 static void
 309 mv64xxx_i2c_prepare_for_io(struct mv64xxx_i2c_data *drv_data,
 310         struct i2c_msg *msg)
 311 {
 312         u32     dir = 0;
 313
 314         drv_data->msg = msg;
 315         drv_data->byte_posn = 0;
 316         drv_data->bytes_left = msg->len;
 317         drv_data->aborting = 0;
 318         drv_data->rc = 0;
 319         drv_data->cntl_bits = MV64XXX_I2C_REG_CONTROL_ACK |
 320                 MV64XXX_I2C_REG_CONTROL_INTEN | MV64XXX_I2C_REG_CONTROL_TWSIEN;
 321
 322         if (msg->flags & I2C_M_RD)
 323                 dir = 1;
 324
 325         if (msg->flags & I2C_M_REV_DIR_ADDR)
 326                 dir ^= 1;
 327
 328         if (msg->flags & I2C_M_TEN) {
 329                 drv_data->addr1 = 0xf0 | (((u32)msg->addr & 0x300) >> 7) | dir;
 330                 drv_data->addr2 = (u32)msg->addr & 0xff;
 331         } else {
 332                 drv_data->addr1 = ((u32)msg->addr & 0x7f) << 1 | dir;
 333                 drv_data->addr2 = 0;
 334         }
 335 }
 336
 337 static void
 338 mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data)
 339 {
 340         long            time_left;
 341         unsigned long   flags;
 342         char            abort = 0;
 343
 344         time_left = wait_event_interruptible_timeout(drv_data->waitq,
 345                 !drv_data->block, msecs_to_jiffies(drv_data->adapter.timeout));
 346
 347         spin_lock_irqsave(&drv_data->lock, flags);
 348         if (!time_left) { /* Timed out */
 349                 drv_data->rc = -ETIMEDOUT;
 350                 abort = 1;
 351         } else if (time_left < 0) { /* Interrupted/Error */
 352                 drv_data->rc = time_left; /* errno value */
 353                 abort = 1;
 354         }
 355
 356         if (abort && drv_data->block) {
 357                 drv_data->aborting = 1;
 358                 spin_unlock_irqrestore(&drv_data->lock, flags);
 359
 360                 time_left = wait_event_timeout(drv_data->waitq,
 361                         !drv_data->block,
 362                         msecs_to_jiffies(drv_data->adapter.timeout));
 363
 364                 if ((time_left <= 0) && drv_data->block) {
 365                         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 366                         dev_err(&drv_data->adapter.dev,
 367                                 "mv64xxx: I2C bus locked, block: %d, "
 368                                 "time_left: %d\n", drv_data->block,
 369                                 (int)time_left);
 370                 }
 371         } else
 372                 spin_unlock_irqrestore(&drv_data->lock, flags);
 373 }
 374
 375 static int
 376 mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg)
 377 {
 378         unsigned long   flags;
 379
 380         spin_lock_irqsave(&drv_data->lock, flags);
 381         mv64xxx_i2c_prepare_for_io(drv_data, msg);
 382
 383         if (unlikely(msg->flags & I2C_M_NOSTART)) { /* Skip start/addr phases */
 384                 if (drv_data->msg->flags & I2C_M_RD) {
 385                         /* No action to do, wait for slave to send a byte */
 386                         drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
 387                         drv_data->state =
 388                                 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
 389                 } else {
 390                         drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
 391                         drv_data->state =
 392                                 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
 393                         drv_data->bytes_left--;
 394                 }
 395         } else {
 396                 drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
 397                 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
 398         }
 399
 400         drv_data->block = 1;
 401         mv64xxx_i2c_do_action(drv_data);
 402         spin_unlock_irqrestore(&drv_data->lock, flags);
 403
 404         mv64xxx_i2c_wait_for_completion(drv_data);
 405         return drv_data->rc;
 406 }
 407
 408 /*
 409  *****************************************************************************
 410  *
 411  *      I2C Core Support Routines (Interface to higher level I2C code)
 412  *
 413  *****************************************************************************
 414  */
 415 static u32
 416 mv64xxx_i2c_functionality(struct i2c_adapter *adap)
 417 {
 418         return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
 419 }
 420
 421 static int
 422 mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 423 {
 424         struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap);
 425         int     i, rc;
 426
 427         for (i=0; i<num; i++)
 428                 if ((rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i])) < 0)
 429                         return rc;
 430
 431         return num;
 432 }
 433
 434 static const struct i2c_algorithm mv64xxx_i2c_algo = {
 435         .master_xfer = mv64xxx_i2c_xfer,
 436         .functionality = mv64xxx_i2c_functionality,
 437 };
 438
 439 /*
 440  *****************************************************************************
 441  *
 442  *      Driver Interface & Early Init Routines
 443  *
 444  *****************************************************************************
 445  */
 446 static void __devinit
 447 mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data)
 448 {
 449         writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SOFT_RESET);
 450         writel((((drv_data->freq_m & 0xf) << 3) | (drv_data->freq_n & 0x7)),
 451                 drv_data->reg_base + MV64XXX_I2C_REG_BAUD);
 452         writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SLAVE_ADDR);
 453         writel(0, drv_data->reg_base + MV64XXX_I2C_REG_EXT_SLAVE_ADDR);
 454         writel(MV64XXX_I2C_REG_CONTROL_TWSIEN | MV64XXX_I2C_REG_CONTROL_STOP,
 455                 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 456         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 457 }
 458
 459 static int __devinit
 460 mv64xxx_i2c_map_regs(struct platform_device *pd,
 461         struct mv64xxx_i2c_data *drv_data)
 462 {
 463         struct resource *r;
 464
 465         if ((r = platform_get_resource(pd, IORESOURCE_MEM, 0)) &&
 466                 request_mem_region(r->start, MV64XXX_I2C_REG_BLOCK_SIZE,
 467                         drv_data->adapter.name)) {
 468
 469                 drv_data->reg_base = ioremap(r->start,
 470                         MV64XXX_I2C_REG_BLOCK_SIZE);
 471                 drv_data->reg_base_p = r->start;
 472         } else
 473                 return -ENOMEM;
 474
 475         return 0;
 476 }
 477
 478 static void __devexit
 479 mv64xxx_i2c_unmap_regs(struct mv64xxx_i2c_data *drv_data)
 480 {
 481         if (drv_data->reg_base) {
 482                 iounmap(drv_data->reg_base);
 483                 release_mem_region(drv_data->reg_base_p,
 484                         MV64XXX_I2C_REG_BLOCK_SIZE);
 485         }
 486
 487         drv_data->reg_base = NULL;
 488         drv_data->reg_base_p = 0;
 489 }
 490
 491 static int __devinit
 492 mv64xxx_i2c_probe(struct platform_device *pd)
 493 {
 494         struct mv64xxx_i2c_data         *drv_data;
 495         struct mv64xxx_i2c_pdata        *pdata = pd->dev.platform_data;
 496         int     rc;
 497
 498         if ((pd->id != 0) || !pdata)
 499                 return -ENODEV;
 500
 501         drv_data = kzalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL);
 502         if (!drv_data)
 503                 return -ENOMEM;
 504
 505         if (mv64xxx_i2c_map_regs(pd, drv_data)) {
 506                 rc = -ENODEV;
 507                 goto exit_kfree;
 508         }
 509
 510         strlcpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter",
 511                 I2C_NAME_SIZE);
 512
 513         init_waitqueue_head(&drv_data->waitq);
 514         spin_lock_init(&drv_data->lock);
 515
 516         drv_data->freq_m = pdata->freq_m;
 517         drv_data->freq_n = pdata->freq_n;
 518         drv_data->irq = platform_get_irq(pd, 0);
 519         if (drv_data->irq < 0) {
 520                 rc = -ENXIO;
 521                 goto exit_unmap_regs;
 522         }
 523         drv_data->adapter.dev.parent = &pd->dev;
 524         drv_data->adapter.id = I2C_HW_MV64XXX;
 525         drv_data->adapter.algo = &mv64xxx_i2c_algo;
 526         drv_data->adapter.owner = THIS_MODULE;
 527         drv_data->adapter.class = I2C_CLASS_HWMON;
 528         drv_data->adapter.timeout = pdata->timeout;
 529         drv_data->adapter.retries = pdata->retries;
 530         platform_set_drvdata(pd, drv_data);
 531         i2c_set_adapdata(&drv_data->adapter, drv_data);
 532
 533         mv64xxx_i2c_hw_init(drv_data);
 534
 535         if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
 536                         MV64XXX_I2C_CTLR_NAME, drv_data)) {
 537                 dev_err(&drv_data->adapter.dev,
 538                         "mv64xxx: Can't register intr handler irq: %d\n",
 539                         drv_data->irq);
 540                 rc = -EINVAL;
 541                 goto exit_unmap_regs;
 542         } else if ((rc = i2c_add_adapter(&drv_data->adapter)) != 0) {
 543                 dev_err(&drv_data->adapter.dev,
 544                         "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc);
 545                 goto exit_free_irq;
 546         }
 547
 548         return 0;
 549
 550         exit_free_irq:
 551                 free_irq(drv_data->irq, drv_data);
 552         exit_unmap_regs:
 553                 mv64xxx_i2c_unmap_regs(drv_data);
 554         exit_kfree:
 555                 kfree(drv_data);
 556         return rc;
 557 }
 558
 559 static int __devexit
 560 mv64xxx_i2c_remove(struct platform_device *dev)
 561 {
 562         struct mv64xxx_i2c_data         *drv_data = platform_get_drvdata(dev);
 563         int     rc;
 564
 565         rc = i2c_del_adapter(&drv_data->adapter);
 566         free_irq(drv_data->irq, drv_data);
 567         mv64xxx_i2c_unmap_regs(drv_data);
 568         kfree(drv_data);
 569
 570         return rc;
 571 }
 572
 573 static struct platform_driver mv64xxx_i2c_driver = {
 574         .probe  = mv64xxx_i2c_probe,
 575         .remove = mv64xxx_i2c_remove,
 576         .driver = {
 577                 .owner  = THIS_MODULE,
 578                 .name   = MV64XXX_I2C_CTLR_NAME,
 579         },
 580 };
 581
 582 static int __init
 583 mv64xxx_i2c_init(void)
 584 {
 585         return platform_driver_register(&mv64xxx_i2c_driver);
 586 }
 587
 588 static void __exit
 589 mv64xxx_i2c_exit(void)
 590 {
 591         platform_driver_unregister(&mv64xxx_i2c_driver);
 592 }
 593
 594 module_init(mv64xxx_i2c_init);
 595 module_exit(mv64xxx_i2c_exit);
 596
 597 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
 598 MODULE_DESCRIPTION("Marvell mv64xxx host bridge i2c ctlr driver");
 599 MODULE_LICENSE("GPL");