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
   3  * (e.g, gt642[46]0, mv643[46]0, mv644[46]0, and Orion SoC family).
   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_i2c.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                     reg_size;
  90         u32                     addr1;
  91         u32                     addr2;
  92         u32                     bytes_left;
  93         u32                     byte_posn;
  94         u32                     block;
  95         int                     rc;
  96         u32                     freq_m;
  97         u32                     freq_n;
  98         wait_queue_head_t       waitq;
  99         spinlock_t              lock;
 100         struct i2c_msg          *msg;
 101         struct i2c_adapter      adapter;
 102 };
 103
 104 /*
 105  *****************************************************************************
 106  *
 107  *      Finite State Machine & Interrupt Routines
 108  *
 109  *****************************************************************************
 110  */
 111
 112 /* Reset hardware and initialize FSM */
 113 static void
 114 mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data)
 115 {
 116         writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SOFT_RESET);
 117         writel((((drv_data->freq_m & 0xf) << 3) | (drv_data->freq_n & 0x7)),
 118                 drv_data->reg_base + MV64XXX_I2C_REG_BAUD);
 119         writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SLAVE_ADDR);
 120         writel(0, drv_data->reg_base + MV64XXX_I2C_REG_EXT_SLAVE_ADDR);
 121         writel(MV64XXX_I2C_REG_CONTROL_TWSIEN | MV64XXX_I2C_REG_CONTROL_STOP,
 122                 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 123         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 124 }
 125
 126 static void
 127 mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
 128 {
 129         /*
 130          * If state is idle, then this is likely the remnants of an old
 131          * operation that driver has given up on or the user has killed.
 132          * If so, issue the stop condition and go to idle.
 133          */
 134         if (drv_data->state == MV64XXX_I2C_STATE_IDLE) {
 135                 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 136                 return;
 137         }
 138
 139         /* The status from the ctlr [mostly] tells us what to do next */
 140         switch (status) {
 141         /* Start condition interrupt */
 142         case MV64XXX_I2C_STATUS_MAST_START: /* 0x08 */
 143         case MV64XXX_I2C_STATUS_MAST_REPEAT_START: /* 0x10 */
 144                 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1;
 145                 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK;
 146                 break;
 147
 148         /* Performing a write */
 149         case MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK: /* 0x18 */
 150                 if (drv_data->msg->flags & I2C_M_TEN) {
 151                         drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
 152                         drv_data->state =
 153                                 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
 154                         break;
 155                 }
 156                 /* FALLTHRU */
 157         case MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK: /* 0xd0 */
 158         case MV64XXX_I2C_STATUS_MAST_WR_ACK: /* 0x28 */
 159                 if ((drv_data->bytes_left == 0)
 160                                 || (drv_data->aborting
 161                                         && (drv_data->byte_posn != 0))) {
 162                         drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 163                         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 164                 } else {
 165                         drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
 166                         drv_data->state =
 167                                 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
 168                         drv_data->bytes_left--;
 169                 }
 170                 break;
 171
 172         /* Performing a read */
 173         case MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK: /* 40 */
 174                 if (drv_data->msg->flags & I2C_M_TEN) {
 175                         drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
 176                         drv_data->state =
 177                                 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
 178                         break;
 179                 }
 180                 /* FALLTHRU */
 181         case MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK: /* 0xe0 */
 182                 if (drv_data->bytes_left == 0) {
 183                         drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 184                         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 185                         break;
 186                 }
 187                 /* FALLTHRU */
 188         case MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK: /* 0x50 */
 189                 if (status != MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK)
 190                         drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
 191                 else {
 192                         drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA;
 193                         drv_data->bytes_left--;
 194                 }
 195                 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
 196
 197                 if ((drv_data->bytes_left == 1) || drv_data->aborting)
 198                         drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_ACK;
 199                 break;
 200
 201         case MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK: /* 0x58 */
 202                 drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA_STOP;
 203                 drv_data->state = MV64XXX_I2C_STATE_IDLE;
 204                 break;
 205
 206         case MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK: /* 0x20 */
 207         case MV64XXX_I2C_STATUS_MAST_WR_NO_ACK: /* 30 */
 208         case MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK: /* 48 */
 209                 /* Doesn't seem to be a device at other end */
 210                 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 211                 drv_data->state = MV64XXX_I2C_STATE_IDLE;
 212                 drv_data->rc = -ENODEV;
 213                 break;
 214
 215         default:
 216                 dev_err(&drv_data->adapter.dev,
 217                         "mv64xxx_i2c_fsm: Ctlr Error -- state: 0x%x, "
 218                         "status: 0x%x, addr: 0x%x, flags: 0x%x\n",
 219                          drv_data->state, status, drv_data->msg->addr,
 220                          drv_data->msg->flags);
 221                 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 222                 mv64xxx_i2c_hw_init(drv_data);
 223                 drv_data->rc = -EIO;
 224         }
 225 }
 226
 227 static void
 228 mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
 229 {
 230         switch(drv_data->action) {
 231         case MV64XXX_I2C_ACTION_CONTINUE:
 232                 writel(drv_data->cntl_bits,
 233                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 234                 break;
 235
 236         case MV64XXX_I2C_ACTION_SEND_START:
 237                 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
 238                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 239                 break;
 240
 241         case MV64XXX_I2C_ACTION_SEND_ADDR_1:
 242                 writel(drv_data->addr1,
 243                         drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 244                 writel(drv_data->cntl_bits,
 245                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 246                 break;
 247
 248         case MV64XXX_I2C_ACTION_SEND_ADDR_2:
 249                 writel(drv_data->addr2,
 250                         drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 251                 writel(drv_data->cntl_bits,
 252                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 253                 break;
 254
 255         case MV64XXX_I2C_ACTION_SEND_DATA:
 256                 writel(drv_data->msg->buf[drv_data->byte_posn++],
 257                         drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 258                 writel(drv_data->cntl_bits,
 259                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 260                 break;
 261
 262         case MV64XXX_I2C_ACTION_RCV_DATA:
 263                 drv_data->msg->buf[drv_data->byte_posn++] =
 264                         readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 265                 writel(drv_data->cntl_bits,
 266                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 267                 break;
 268
 269         case MV64XXX_I2C_ACTION_RCV_DATA_STOP:
 270                 drv_data->msg->buf[drv_data->byte_posn++] =
 271                         readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 272                 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
 273                 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
 274                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 275                 drv_data->block = 0;
 276                 wake_up_interruptible(&drv_data->waitq);
 277                 break;
 278
 279         case MV64XXX_I2C_ACTION_INVALID:
 280         default:
 281                 dev_err(&drv_data->adapter.dev,
 282                         "mv64xxx_i2c_do_action: Invalid action: %d\n",
 283                         drv_data->action);
 284                 drv_data->rc = -EIO;
 285                 /* FALLTHRU */
 286         case MV64XXX_I2C_ACTION_SEND_STOP:
 287                 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
 288                 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
 289                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 290                 drv_data->block = 0;
 291                 wake_up_interruptible(&drv_data->waitq);
 292                 break;
 293         }
 294 }
 295
 296 static int
 297 mv64xxx_i2c_intr(int irq, void *dev_id)
 298 {
 299         struct mv64xxx_i2c_data *drv_data = dev_id;
 300         unsigned long   flags;
 301         u32             status;
 302         int             rc = IRQ_NONE;
 303
 304         spin_lock_irqsave(&drv_data->lock, flags);
 305         while (readl(drv_data->reg_base + MV64XXX_I2C_REG_CONTROL) &
 306                                                 MV64XXX_I2C_REG_CONTROL_IFLG) {
 307                 status = readl(drv_data->reg_base + MV64XXX_I2C_REG_STATUS);
 308                 mv64xxx_i2c_fsm(drv_data, status);
 309                 mv64xxx_i2c_do_action(drv_data);
 310                 rc = IRQ_HANDLED;
 311         }
 312         spin_unlock_irqrestore(&drv_data->lock, flags);
 313
 314         return rc;
 315 }
 316
 317 /*
 318  *****************************************************************************
 319  *
 320  *      I2C Msg Execution Routines
 321  *
 322  *****************************************************************************
 323  */
 324 static void
 325 mv64xxx_i2c_prepare_for_io(struct mv64xxx_i2c_data *drv_data,
 326         struct i2c_msg *msg)
 327 {
 328         u32     dir = 0;
 329
 330         drv_data->msg = msg;
 331         drv_data->byte_posn = 0;
 332         drv_data->bytes_left = msg->len;
 333         drv_data->aborting = 0;
 334         drv_data->rc = 0;
 335         drv_data->cntl_bits = MV64XXX_I2C_REG_CONTROL_ACK |
 336                 MV64XXX_I2C_REG_CONTROL_INTEN | MV64XXX_I2C_REG_CONTROL_TWSIEN;
 337
 338         if (msg->flags & I2C_M_RD)
 339                 dir = 1;
 340
 341         if (msg->flags & I2C_M_REV_DIR_ADDR)
 342                 dir ^= 1;
 343
 344         if (msg->flags & I2C_M_TEN) {
 345                 drv_data->addr1 = 0xf0 | (((u32)msg->addr & 0x300) >> 7) | dir;
 346                 drv_data->addr2 = (u32)msg->addr & 0xff;
 347         } else {
 348                 drv_data->addr1 = ((u32)msg->addr & 0x7f) << 1 | dir;
 349                 drv_data->addr2 = 0;
 350         }
 351 }
 352
 353 static void
 354 mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data)
 355 {
 356         long            time_left;
 357         unsigned long   flags;
 358         char            abort = 0;
 359
 360         time_left = wait_event_interruptible_timeout(drv_data->waitq,
 361                 !drv_data->block, msecs_to_jiffies(drv_data->adapter.timeout));
 362
 363         spin_lock_irqsave(&drv_data->lock, flags);
 364         if (!time_left) { /* Timed out */
 365                 drv_data->rc = -ETIMEDOUT;
 366                 abort = 1;
 367         } else if (time_left < 0) { /* Interrupted/Error */
 368                 drv_data->rc = time_left; /* errno value */
 369                 abort = 1;
 370         }
 371
 372         if (abort && drv_data->block) {
 373                 drv_data->aborting = 1;
 374                 spin_unlock_irqrestore(&drv_data->lock, flags);
 375
 376                 time_left = wait_event_timeout(drv_data->waitq,
 377                         !drv_data->block,
 378                         msecs_to_jiffies(drv_data->adapter.timeout));
 379
 380                 if ((time_left <= 0) && drv_data->block) {
 381                         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 382                         dev_err(&drv_data->adapter.dev,
 383                                 "mv64xxx: I2C bus locked, block: %d, "
 384                                 "time_left: %d\n", drv_data->block,
 385                                 (int)time_left);
 386                         mv64xxx_i2c_hw_init(drv_data);
 387                 }
 388         } else
 389                 spin_unlock_irqrestore(&drv_data->lock, flags);
 390 }
 391
 392 static int
 393 mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg)
 394 {
 395         unsigned long   flags;
 396
 397         spin_lock_irqsave(&drv_data->lock, flags);
 398         mv64xxx_i2c_prepare_for_io(drv_data, msg);
 399
 400         if (unlikely(msg->flags & I2C_M_NOSTART)) { /* Skip start/addr phases */
 401                 if (drv_data->msg->flags & I2C_M_RD) {
 402                         /* No action to do, wait for slave to send a byte */
 403                         drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
 404                         drv_data->state =
 405                                 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
 406                 } else {
 407                         drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
 408                         drv_data->state =
 409                                 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
 410                         drv_data->bytes_left--;
 411                 }
 412         } else {
 413                 drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
 414                 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
 415         }
 416
 417         drv_data->block = 1;
 418         mv64xxx_i2c_do_action(drv_data);
 419         spin_unlock_irqrestore(&drv_data->lock, flags);
 420
 421         mv64xxx_i2c_wait_for_completion(drv_data);
 422         return drv_data->rc;
 423 }
 424
 425 /*
 426  *****************************************************************************
 427  *
 428  *      I2C Core Support Routines (Interface to higher level I2C code)
 429  *
 430  *****************************************************************************
 431  */
 432 static u32
 433 mv64xxx_i2c_functionality(struct i2c_adapter *adap)
 434 {
 435         return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
 436 }
 437
 438 static int
 439 mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 440 {
 441         struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap);
 442         int     i, rc;
 443
 444         for (i=0; i<num; i++)
 445                 if ((rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i])) < 0)
 446                         return rc;
 447
 448         return num;
 449 }
 450
 451 static const struct i2c_algorithm mv64xxx_i2c_algo = {
 452         .master_xfer = mv64xxx_i2c_xfer,
 453         .functionality = mv64xxx_i2c_functionality,
 454 };
 455
 456 /*
 457  *****************************************************************************
 458  *
 459  *      Driver Interface & Early Init Routines
 460  *
 461  *****************************************************************************
 462  */
 463 static int __devinit
 464 mv64xxx_i2c_map_regs(struct platform_device *pd,
 465         struct mv64xxx_i2c_data *drv_data)
 466 {
 467         int size;
 468         struct resource *r = platform_get_resource(pd, IORESOURCE_MEM, 0);
 469
 470         if (!r)
 471                 return -ENODEV;
 472
 473         size = r->end - r->start + 1;
 474
 475         if (!request_mem_region(r->start, size, drv_data->adapter.name))
 476                 return -EBUSY;
 477
 478         drv_data->reg_base = ioremap(r->start, size);
 479         drv_data->reg_base_p = r->start;
 480         drv_data->reg_size = size;
 481
 482         return 0;
 483 }
 484
 485 static void __devexit
 486 mv64xxx_i2c_unmap_regs(struct mv64xxx_i2c_data *drv_data)
 487 {
 488         if (drv_data->reg_base) {
 489                 iounmap(drv_data->reg_base);
 490                 release_mem_region(drv_data->reg_base_p, drv_data->reg_size);
 491         }
 492
 493         drv_data->reg_base = NULL;
 494         drv_data->reg_base_p = 0;
 495 }
 496
 497 static int __devinit
 498 mv64xxx_i2c_probe(struct platform_device *pd)
 499 {
 500         struct mv64xxx_i2c_data         *drv_data;
 501         struct mv64xxx_i2c_pdata        *pdata = pd->dev.platform_data;
 502         int     rc;
 503
 504         if ((pd->id != 0) || !pdata)
 505                 return -ENODEV;
 506
 507         drv_data = kzalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL);
 508         if (!drv_data)
 509                 return -ENOMEM;
 510
 511         if (mv64xxx_i2c_map_regs(pd, drv_data)) {
 512                 rc = -ENODEV;
 513                 goto exit_kfree;
 514         }
 515
 516         strlcpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter",
 517                 sizeof(drv_data->adapter.name));
 518
 519         init_waitqueue_head(&drv_data->waitq);
 520         spin_lock_init(&drv_data->lock);
 521
 522         drv_data->freq_m = pdata->freq_m;
 523         drv_data->freq_n = pdata->freq_n;
 524         drv_data->irq = platform_get_irq(pd, 0);
 525         if (drv_data->irq < 0) {
 526                 rc = -ENXIO;
 527                 goto exit_unmap_regs;
 528         }
 529         drv_data->adapter.dev.parent = &pd->dev;
 530         drv_data->adapter.algo = &mv64xxx_i2c_algo;
 531         drv_data->adapter.owner = THIS_MODULE;
 532         drv_data->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
 533         drv_data->adapter.timeout = pdata->timeout;
 534         drv_data->adapter.nr = pd->id;
 535         platform_set_drvdata(pd, drv_data);
 536         i2c_set_adapdata(&drv_data->adapter, drv_data);
 537
 538         mv64xxx_i2c_hw_init(drv_data);
 539
 540         if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
 541                         MV64XXX_I2C_CTLR_NAME, drv_data)) {
 542                 dev_err(&drv_data->adapter.dev,
 543                         "mv64xxx: Can't register intr handler irq: %d\n",
 544                         drv_data->irq);
 545                 rc = -EINVAL;
 546                 goto exit_unmap_regs;
 547         } else if ((rc = i2c_add_numbered_adapter(&drv_data->adapter)) != 0) {
 548                 dev_err(&drv_data->adapter.dev,
 549                         "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc);
 550                 goto exit_free_irq;
 551         }
 552
 553         return 0;
 554
 555         exit_free_irq:
 556                 free_irq(drv_data->irq, drv_data);
 557         exit_unmap_regs:
 558                 mv64xxx_i2c_unmap_regs(drv_data);
 559         exit_kfree:
 560                 kfree(drv_data);
 561         return rc;
 562 }
 563
 564 static int __devexit
 565 mv64xxx_i2c_remove(struct platform_device *dev)
 566 {
 567         struct mv64xxx_i2c_data         *drv_data = platform_get_drvdata(dev);
 568         int     rc;
 569
 570         rc = i2c_del_adapter(&drv_data->adapter);
 571         free_irq(drv_data->irq, drv_data);
 572         mv64xxx_i2c_unmap_regs(drv_data);
 573         kfree(drv_data);
 574
 575         return rc;
 576 }
 577
 578 static struct platform_driver mv64xxx_i2c_driver = {
 579         .probe  = mv64xxx_i2c_probe,
 580         .remove = mv64xxx_i2c_remove,
 581         .driver = {
 582                 .owner  = THIS_MODULE,
 583                 .name   = MV64XXX_I2C_CTLR_NAME,
 584         },
 585 };
 586
 587 static int __init
 588 mv64xxx_i2c_init(void)
 589 {
 590         return platform_driver_register(&mv64xxx_i2c_driver);
 591 }
 592
 593 static void __exit
 594 mv64xxx_i2c_exit(void)
 595 {
 596         platform_driver_unregister(&mv64xxx_i2c_driver);
 597 }
 598
 599 module_init(mv64xxx_i2c_init);
 600 module_exit(mv64xxx_i2c_exit);
 601
 602 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
 603 MODULE_DESCRIPTION("Marvell mv64xxx host bridge i2c ctlr driver");
 604 MODULE_LICENSE("GPL");