drivers/i2c/busses/i2c-mv64xxx.c

   1 /*
   2  * drivers/i2c/busses/i2c-mv64xxx.c
   3  *
   4  * Driver for the i2c controller on the Marvell line of host bridges for MIPS
   5  * and PPC (e.g, gt642[46]0, mv643[46]0, mv644[46]0).
   6  *
   7  * Author: Mark A. Greer <mgreer@mvista.com>
   8  *
   9  * 2005 (c) MontaVista, Software, Inc.  This file is licensed under
  10  * the terms of the GNU General Public License version 2.  This program
  11  * is licensed "as is" without any warranty of any kind, whether express
  12  * or implied.
  13  */
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/i2c.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/mv643xx.h>
  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         MV64XXX_I2C_STATE_ABORTING,
  67 };
  68
  69 /* Driver actions */
  70 enum {
  71         MV64XXX_I2C_ACTION_INVALID,
  72         MV64XXX_I2C_ACTION_CONTINUE,
  73         MV64XXX_I2C_ACTION_SEND_START,
  74         MV64XXX_I2C_ACTION_SEND_ADDR_1,
  75         MV64XXX_I2C_ACTION_SEND_ADDR_2,
  76         MV64XXX_I2C_ACTION_SEND_DATA,
  77         MV64XXX_I2C_ACTION_RCV_DATA,
  78         MV64XXX_I2C_ACTION_RCV_DATA_STOP,
  79         MV64XXX_I2C_ACTION_SEND_STOP,
  80 };
  81
  82 struct mv64xxx_i2c_data {
  83         int                     irq;
  84         u32                     state;
  85         u32                     action;
  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         if (drv_data->state == MV64XXX_I2C_STATE_ABORTING) {
 124                 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 125                 drv_data->state = MV64XXX_I2C_STATE_IDLE;
 126                 return;
 127         }
 128
 129         /* The status from the ctlr [mostly] tells us what to do next */
 130         switch (status) {
 131         /* Start condition interrupt */
 132         case MV64XXX_I2C_STATUS_MAST_START: /* 0x08 */
 133         case MV64XXX_I2C_STATUS_MAST_REPEAT_START: /* 0x10 */
 134                 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1;
 135                 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK;
 136                 break;
 137
 138         /* Performing a write */
 139         case MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK: /* 0x18 */
 140                 if (drv_data->msg->flags & I2C_M_TEN) {
 141                         drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
 142                         drv_data->state =
 143                                 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
 144                         break;
 145                 }
 146                 /* FALLTHRU */
 147         case MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK: /* 0xd0 */
 148         case MV64XXX_I2C_STATUS_MAST_WR_ACK: /* 0x28 */
 149                 if (drv_data->bytes_left > 0) {
 150                         drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
 151                         drv_data->state =
 152                                 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
 153                         drv_data->bytes_left--;
 154                 } else {
 155                         drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 156                         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 157                 }
 158                 break;
 159
 160         /* Performing a read */
 161         case MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK: /* 40 */
 162                 if (drv_data->msg->flags & I2C_M_TEN) {
 163                         drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
 164                         drv_data->state =
 165                                 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
 166                         break;
 167                 }
 168                 /* FALLTHRU */
 169         case MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK: /* 0xe0 */
 170                 if (drv_data->bytes_left == 0) {
 171                         drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 172                         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 173                         break;
 174                 }
 175                 /* FALLTHRU */
 176         case MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK: /* 0x50 */
 177                 if (status != MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK)
 178                         drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
 179                 else {
 180                         drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA;
 181                         drv_data->bytes_left--;
 182                 }
 183                 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
 184
 185                 if (drv_data->bytes_left == 1)
 186                         drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_ACK;
 187                 break;
 188
 189         case MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK: /* 0x58 */
 190                 drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA_STOP;
 191                 drv_data->state = MV64XXX_I2C_STATE_IDLE;
 192                 break;
 193
 194         case MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK: /* 0x20 */
 195         case MV64XXX_I2C_STATUS_MAST_WR_NO_ACK: /* 30 */
 196         case MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK: /* 48 */
 197                 /* Doesn't seem to be a device at other end */
 198                 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 199                 drv_data->state = MV64XXX_I2C_STATE_IDLE;
 200                 drv_data->rc = -ENODEV;
 201                 break;
 202
 203         default:
 204                 dev_err(&drv_data->adapter.dev,
 205                         "mv64xxx_i2c_fsm: Ctlr Error -- state: 0x%x, "
 206                         "status: 0x%x, addr: 0x%x, flags: 0x%x\n",
 207                          drv_data->state, status, drv_data->msg->addr,
 208                          drv_data->msg->flags);
 209                 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
 210                 drv_data->state = MV64XXX_I2C_STATE_IDLE;
 211                 drv_data->rc = -EIO;
 212         }
 213 }
 214
 215 static void
 216 mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
 217 {
 218         switch(drv_data->action) {
 219         case MV64XXX_I2C_ACTION_CONTINUE:
 220                 writel(drv_data->cntl_bits,
 221                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 222                 break;
 223
 224         case MV64XXX_I2C_ACTION_SEND_START:
 225                 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
 226                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 227                 break;
 228
 229         case MV64XXX_I2C_ACTION_SEND_ADDR_1:
 230                 writel(drv_data->addr1,
 231                         drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 232                 writel(drv_data->cntl_bits,
 233                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 234                 break;
 235
 236         case MV64XXX_I2C_ACTION_SEND_ADDR_2:
 237                 writel(drv_data->addr2,
 238                         drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 239                 writel(drv_data->cntl_bits,
 240                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 241                 break;
 242
 243         case MV64XXX_I2C_ACTION_SEND_DATA:
 244                 writel(drv_data->msg->buf[drv_data->byte_posn++],
 245                         drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 246                 writel(drv_data->cntl_bits,
 247                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 248                 break;
 249
 250         case MV64XXX_I2C_ACTION_RCV_DATA:
 251                 drv_data->msg->buf[drv_data->byte_posn++] =
 252                         readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 253                 writel(drv_data->cntl_bits,
 254                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 255                 break;
 256
 257         case MV64XXX_I2C_ACTION_RCV_DATA_STOP:
 258                 drv_data->msg->buf[drv_data->byte_posn++] =
 259                         readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
 260                 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
 261                 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
 262                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 263                 drv_data->block = 0;
 264                 wake_up_interruptible(&drv_data->waitq);
 265                 break;
 266
 267         case MV64XXX_I2C_ACTION_INVALID:
 268         default:
 269                 dev_err(&drv_data->adapter.dev,
 270                         "mv64xxx_i2c_do_action: Invalid action: %d\n",
 271                         drv_data->action);
 272                 drv_data->rc = -EIO;
 273                 /* FALLTHRU */
 274         case MV64XXX_I2C_ACTION_SEND_STOP:
 275                 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
 276                 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
 277                         drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 278                 drv_data->block = 0;
 279                 wake_up_interruptible(&drv_data->waitq);
 280                 break;
 281         }
 282 }
 283
 284 static int
 285 mv64xxx_i2c_intr(int irq, void *dev_id, struct pt_regs *regs)
 286 {
 287         struct mv64xxx_i2c_data *drv_data = dev_id;
 288         unsigned long   flags;
 289         u32             status;
 290         int             rc = IRQ_NONE;
 291
 292         spin_lock_irqsave(&drv_data->lock, flags);
 293         while (readl(drv_data->reg_base + MV64XXX_I2C_REG_CONTROL) &
 294                                                 MV64XXX_I2C_REG_CONTROL_IFLG) {
 295                 status = readl(drv_data->reg_base + MV64XXX_I2C_REG_STATUS);
 296                 mv64xxx_i2c_fsm(drv_data, status);
 297                 mv64xxx_i2c_do_action(drv_data);
 298                 rc = IRQ_HANDLED;
 299         }
 300         spin_unlock_irqrestore(&drv_data->lock, flags);
 301
 302         return rc;
 303 }
 304
 305 /*
 306  *****************************************************************************
 307  *
 308  *      I2C Msg Execution Routines
 309  *
 310  *****************************************************************************
 311  */
 312 static void
 313 mv64xxx_i2c_prepare_for_io(struct mv64xxx_i2c_data *drv_data,
 314         struct i2c_msg *msg)
 315 {
 316         u32     dir = 0;
 317
 318         drv_data->msg = msg;
 319         drv_data->byte_posn = 0;
 320         drv_data->bytes_left = msg->len;
 321         drv_data->rc = 0;
 322         drv_data->cntl_bits = MV64XXX_I2C_REG_CONTROL_ACK |
 323                 MV64XXX_I2C_REG_CONTROL_INTEN | MV64XXX_I2C_REG_CONTROL_TWSIEN;
 324
 325         if (msg->flags & I2C_M_RD)
 326                 dir = 1;
 327
 328         if (msg->flags & I2C_M_REV_DIR_ADDR)
 329                 dir ^= 1;
 330
 331         if (msg->flags & I2C_M_TEN) {
 332                 drv_data->addr1 = 0xf0 | (((u32)msg->addr & 0x300) >> 7) | dir;
 333                 drv_data->addr2 = (u32)msg->addr & 0xff;
 334         } else {
 335                 drv_data->addr1 = ((u32)msg->addr & 0x7f) << 1 | dir;
 336                 drv_data->addr2 = 0;
 337         }
 338 }
 339
 340 static void
 341 mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data)
 342 {
 343         long            time_left;
 344         unsigned long   flags;
 345         char            abort = 0;
 346
 347         time_left = wait_event_interruptible_timeout(drv_data->waitq,
 348                 !drv_data->block, msecs_to_jiffies(drv_data->adapter.timeout));
 349
 350         spin_lock_irqsave(&drv_data->lock, flags);
 351         if (!time_left) { /* Timed out */
 352                 drv_data->rc = -ETIMEDOUT;
 353                 abort = 1;
 354         } else if (time_left < 0) { /* Interrupted/Error */
 355                 drv_data->rc = time_left; /* errno value */
 356                 abort = 1;
 357         }
 358
 359         if (abort && drv_data->block) {
 360                 drv_data->state = MV64XXX_I2C_STATE_ABORTING;
 361                 spin_unlock_irqrestore(&drv_data->lock, flags);
 362
 363                 time_left = wait_event_timeout(drv_data->waitq,
 364                         !drv_data->block,
 365                         msecs_to_jiffies(drv_data->adapter.timeout));
 366
 367                 if (time_left <= 0) {
 368                         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 369                         dev_err(&drv_data->adapter.dev,
 370                                 "mv64xxx: I2C bus locked\n");
 371                 }
 372         } else
 373                 spin_unlock_irqrestore(&drv_data->lock, flags);
 374 }
 375
 376 static int
 377 mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg)
 378 {
 379         unsigned long   flags;
 380
 381         spin_lock_irqsave(&drv_data->lock, flags);
 382         mv64xxx_i2c_prepare_for_io(drv_data, msg);
 383
 384         if (unlikely(msg->flags & I2C_M_NOSTART)) { /* Skip start/addr phases */
 385                 if (drv_data->msg->flags & I2C_M_RD) {
 386                         /* No action to do, wait for slave to send a byte */
 387                         drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
 388                         drv_data->state =
 389                                 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
 390                 } else {
 391                         drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
 392                         drv_data->state =
 393                                 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
 394                         drv_data->bytes_left--;
 395                 }
 396         } else {
 397                 drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
 398                 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
 399         }
 400
 401         drv_data->block = 1;
 402         mv64xxx_i2c_do_action(drv_data);
 403         spin_unlock_irqrestore(&drv_data->lock, flags);
 404
 405         mv64xxx_i2c_wait_for_completion(drv_data);
 406         return drv_data->rc;
 407 }
 408
 409 /*
 410  *****************************************************************************
 411  *
 412  *      I2C Core Support Routines (Interface to higher level I2C code)
 413  *
 414  *****************************************************************************
 415  */
 416 static u32
 417 mv64xxx_i2c_functionality(struct i2c_adapter *adap)
 418 {
 419         return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
 420 }
 421
 422 static int
 423 mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 424 {
 425         struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap);
 426         int     i, rc = 0;
 427
 428         for (i=0; i<num; i++)
 429                 if ((rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i])) != 0)
 430                         break;
 431
 432         return rc;
 433 }
 434
 435 static struct i2c_algorithm mv64xxx_i2c_algo = {
 436         .name = MV64XXX_I2C_CTLR_NAME " algorithm",
 437         .id = I2C_ALGO_MV64XXX,
 438         .master_xfer = mv64xxx_i2c_xfer,
 439         .functionality = mv64xxx_i2c_functionality,
 440 };
 441
 442 /*
 443  *****************************************************************************
 444  *
 445  *      Driver Interface & Early Init Routines
 446  *
 447  *****************************************************************************
 448  */
 449 static void __devinit
 450 mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data)
 451 {
 452         writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SOFT_RESET);
 453         writel((((drv_data->freq_m & 0xf) << 3) | (drv_data->freq_n & 0x7)),
 454                 drv_data->reg_base + MV64XXX_I2C_REG_BAUD);
 455         writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SLAVE_ADDR);
 456         writel(0, drv_data->reg_base + MV64XXX_I2C_REG_EXT_SLAVE_ADDR);
 457         writel(MV64XXX_I2C_REG_CONTROL_TWSIEN | MV64XXX_I2C_REG_CONTROL_STOP,
 458                 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
 459         drv_data->state = MV64XXX_I2C_STATE_IDLE;
 460 }
 461
 462 static int __devinit
 463 mv64xxx_i2c_map_regs(struct platform_device *pd,
 464         struct mv64xxx_i2c_data *drv_data)
 465 {
 466         struct resource *r;
 467
 468         if ((r = platform_get_resource(pd, IORESOURCE_MEM, 0)) &&
 469                 request_mem_region(r->start, MV64XXX_I2C_REG_BLOCK_SIZE,
 470                         drv_data->adapter.name)) {
 471
 472                 drv_data->reg_base = ioremap(r->start,
 473                         MV64XXX_I2C_REG_BLOCK_SIZE);
 474                 drv_data->reg_base_p = r->start;
 475         } else
 476                 return -ENOMEM;
 477
 478         return 0;
 479 }
 480
 481 static void __devexit
 482 mv64xxx_i2c_unmap_regs(struct mv64xxx_i2c_data *drv_data)
 483 {
 484         if (drv_data->reg_base) {
 485                 iounmap(drv_data->reg_base);
 486                 release_mem_region(drv_data->reg_base_p,
 487                         MV64XXX_I2C_REG_BLOCK_SIZE);
 488         }
 489
 490         drv_data->reg_base = NULL;
 491         drv_data->reg_base_p = 0;
 492 }
 493
 494 static int __devinit
 495 mv64xxx_i2c_probe(struct device *dev)
 496 {
 497         struct platform_device          *pd = to_platform_device(dev);
 498         struct mv64xxx_i2c_data         *drv_data;
 499         struct mv64xxx_i2c_pdata        *pdata = dev->platform_data;
 500         int     rc;
 501
 502         if ((pd->id != 0) || !pdata)
 503                 return -ENODEV;
 504
 505         drv_data = kmalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL);
 506
 507         if (!drv_data)
 508                 return -ENOMEM;
 509
 510         memset(drv_data, 0, sizeof(struct mv64xxx_i2c_data));
 511
 512         if (mv64xxx_i2c_map_regs(pd, drv_data)) {
 513                 rc = -ENODEV;
 514                 goto exit_kfree;
 515         }
 516
 517         strncpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter",
 518                 I2C_NAME_SIZE);
 519
 520         init_waitqueue_head(&drv_data->waitq);
 521         spin_lock_init(&drv_data->lock);
 522
 523         drv_data->freq_m = pdata->freq_m;
 524         drv_data->freq_n = pdata->freq_n;
 525         drv_data->irq = platform_get_irq(pd, 0);
 526         drv_data->adapter.id = I2C_ALGO_MV64XXX | I2C_HW_MV64XXX;
 527         drv_data->adapter.algo = &mv64xxx_i2c_algo;
 528         drv_data->adapter.owner = THIS_MODULE;
 529         drv_data->adapter.class = I2C_CLASS_HWMON;
 530         drv_data->adapter.timeout = pdata->timeout;
 531         drv_data->adapter.retries = pdata->retries;
 532         dev_set_drvdata(dev, drv_data);
 533         i2c_set_adapdata(&drv_data->adapter, drv_data);
 534
 535         if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
 536                 MV64XXX_I2C_CTLR_NAME, drv_data)) {
 537
 538                 dev_err(dev, "mv64xxx: Can't register intr handler "
 539                         "irq: %d\n", 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(dev, "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc);
 544                 goto exit_free_irq;
 545         }
 546
 547         mv64xxx_i2c_hw_init(drv_data);
 548
 549         return 0;
 550
 551         exit_free_irq:
 552                 free_irq(drv_data->irq, drv_data);
 553         exit_unmap_regs:
 554                 mv64xxx_i2c_unmap_regs(drv_data);
 555         exit_kfree:
 556                 kfree(drv_data);
 557         return rc;
 558 }
 559
 560 static int __devexit
 561 mv64xxx_i2c_remove(struct device *dev)
 562 {
 563         struct mv64xxx_i2c_data         *drv_data = dev_get_drvdata(dev);
 564         int     rc;
 565
 566         rc = i2c_del_adapter(&drv_data->adapter);
 567         free_irq(drv_data->irq, drv_data);
 568         mv64xxx_i2c_unmap_regs(drv_data);
 569         kfree(drv_data);
 570
 571         return rc;
 572 }
 573
 574 static struct device_driver mv64xxx_i2c_driver = {
 575         .name   = MV64XXX_I2C_CTLR_NAME,
 576         .bus    = &platform_bus_type,
 577         .probe  = mv64xxx_i2c_probe,
 578         .remove = mv64xxx_i2c_remove,
 579 };
 580
 581 static int __init
 582 mv64xxx_i2c_init(void)
 583 {
 584         return driver_register(&mv64xxx_i2c_driver);
 585 }
 586
 587 static void __exit
 588 mv64xxx_i2c_exit(void)
 589 {
 590         driver_unregister(&mv64xxx_i2c_driver);
 591 }
 592
 593 module_init(mv64xxx_i2c_init);
 594 module_exit(mv64xxx_i2c_exit);
 595
 596 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
 597 MODULE_DESCRIPTION("Marvell mv64xxx host bridge i2c ctlr driver");
 598 MODULE_LICENSE("GPL");