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

   1 /*
   2  * (C) Copyright 2003-2004
   3  * Humboldt Solutions Ltd, adrian@humboldt.co.uk.
   4
   5  * This is a combined i2c adapter and algorithm driver for the
   6  * MPC107/Tsi107 PowerPC northbridge and processors that include
   7  * the same I2C unit (8240, 8245, 85xx).
   8  *
   9  * Release 0.8
  10  *
  11  * This file is licensed under the terms of the GNU General Public
  12  * License version 2. This program is licensed "as is" without any
  13  * warranty of any kind, whether express or implied.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/sched.h>
  19 #include <linux/init.h>
  20 #include <linux/of_platform.h>
  21 #include <linux/of_i2c.h>
  22
  23 #include <linux/io.h>
  24 #include <linux/fsl_devices.h>
  25 #include <linux/i2c.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/delay.h>
  28
  29 #include <asm/mpc52xx.h>
  30 #include <sysdev/fsl_soc.h>
  31
  32 #define DRV_NAME "mpc-i2c"
  33
  34 #define MPC_I2C_FDR   0x04
  35 #define MPC_I2C_CR    0x08
  36 #define MPC_I2C_SR    0x0c
  37 #define MPC_I2C_DR    0x10
  38 #define MPC_I2C_DFSRR 0x14
  39
  40 #define CCR_MEN  0x80
  41 #define CCR_MIEN 0x40
  42 #define CCR_MSTA 0x20
  43 #define CCR_MTX  0x10
  44 #define CCR_TXAK 0x08
  45 #define CCR_RSTA 0x04
  46
  47 #define CSR_MCF  0x80
  48 #define CSR_MAAS 0x40
  49 #define CSR_MBB  0x20
  50 #define CSR_MAL  0x10
  51 #define CSR_SRW  0x04
  52 #define CSR_MIF  0x02
  53 #define CSR_RXAK 0x01
  54
  55 struct mpc_i2c {
  56         struct device *dev;
  57         void __iomem *base;
  58         u32 interrupt;
  59         wait_queue_head_t queue;
  60         struct i2c_adapter adap;
  61         int irq;
  62 };
  63
  64 struct mpc_i2c_divider {
  65         u16 divider;
  66         u16 fdr;        /* including dfsrr */
  67 };
  68
  69 struct mpc_i2c_match_data {
  70         void (*setclock)(struct device_node *node,
  71                          struct mpc_i2c *i2c,
  72                          u32 clock, u32 prescaler);
  73         u32 prescaler;
  74 };
  75
  76 static inline void writeccr(struct mpc_i2c *i2c, u32 x)
  77 {
  78         writeb(x, i2c->base + MPC_I2C_CR);
  79 }
  80
  81 static irqreturn_t mpc_i2c_isr(int irq, void *dev_id)
  82 {
  83         struct mpc_i2c *i2c = dev_id;
  84         if (readb(i2c->base + MPC_I2C_SR) & CSR_MIF) {
  85                 /* Read again to allow register to stabilise */
  86                 i2c->interrupt = readb(i2c->base + MPC_I2C_SR);
  87                 writeb(0, i2c->base + MPC_I2C_SR);
  88                 wake_up(&i2c->queue);
  89         }
  90         return IRQ_HANDLED;
  91 }
  92
  93 /* Sometimes 9th clock pulse isn't generated, and slave doesn't release
  94  * the bus, because it wants to send ACK.
  95  * Following sequence of enabling/disabling and sending start/stop generates
  96  * the pulse, so it's all OK.
  97  */
  98 static void mpc_i2c_fixup(struct mpc_i2c *i2c)
  99 {
 100         writeccr(i2c, 0);
 101         udelay(30);
 102         writeccr(i2c, CCR_MEN);
 103         udelay(30);
 104         writeccr(i2c, CCR_MSTA | CCR_MTX);
 105         udelay(30);
 106         writeccr(i2c, CCR_MSTA | CCR_MTX | CCR_MEN);
 107         udelay(30);
 108         writeccr(i2c, CCR_MEN);
 109         udelay(30);
 110 }
 111
 112 static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
 113 {
 114         unsigned long orig_jiffies = jiffies;
 115         u32 x;
 116         int result = 0;
 117
 118         if (i2c->irq == NO_IRQ) {
 119                 while (!(readb(i2c->base + MPC_I2C_SR) & CSR_MIF)) {
 120                         schedule();
 121                         if (time_after(jiffies, orig_jiffies + timeout)) {
 122                                 dev_dbg(i2c->dev, "timeout\n");
 123                                 writeccr(i2c, 0);
 124                                 result = -EIO;
 125                                 break;
 126                         }
 127                 }
 128                 x = readb(i2c->base + MPC_I2C_SR);
 129                 writeb(0, i2c->base + MPC_I2C_SR);
 130         } else {
 131                 /* Interrupt mode */
 132                 result = wait_event_timeout(i2c->queue,
 133                         (i2c->interrupt & CSR_MIF), timeout);
 134
 135                 if (unlikely(!(i2c->interrupt & CSR_MIF))) {
 136                         dev_dbg(i2c->dev, "wait timeout\n");
 137                         writeccr(i2c, 0);
 138                         result = -ETIMEDOUT;
 139                 }
 140
 141                 x = i2c->interrupt;
 142                 i2c->interrupt = 0;
 143         }
 144
 145         if (result < 0)
 146                 return result;
 147
 148         if (!(x & CSR_MCF)) {
 149                 dev_dbg(i2c->dev, "unfinished\n");
 150                 return -EIO;
 151         }
 152
 153         if (x & CSR_MAL) {
 154                 dev_dbg(i2c->dev, "MAL\n");
 155                 return -EIO;
 156         }
 157
 158         if (writing && (x & CSR_RXAK)) {
 159                 dev_dbg(i2c->dev, "No RXAK\n");
 160                 /* generate stop */
 161                 writeccr(i2c, CCR_MEN);
 162                 return -EIO;
 163         }
 164         return 0;
 165 }
 166
 167 #ifdef CONFIG_PPC_MPC52xx
 168 static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
 169         {20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
 170         {28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
 171         {36, 0x26}, {40, 0x27}, {44, 0x04}, {48, 0x28},
 172         {52, 0x63}, {56, 0x29}, {60, 0x41}, {64, 0x2a},
 173         {68, 0x07}, {72, 0x2b}, {80, 0x2c}, {88, 0x09},
 174         {96, 0x2d}, {104, 0x0a}, {112, 0x2e}, {120, 0x81},
 175         {128, 0x2f}, {136, 0x47}, {144, 0x0c}, {160, 0x30},
 176         {176, 0x49}, {192, 0x31}, {208, 0x4a}, {224, 0x32},
 177         {240, 0x0f}, {256, 0x33}, {272, 0x87}, {288, 0x10},
 178         {320, 0x34}, {352, 0x89}, {384, 0x35}, {416, 0x8a},
 179         {448, 0x36}, {480, 0x13}, {512, 0x37}, {576, 0x14},
 180         {640, 0x38}, {768, 0x39}, {896, 0x3a}, {960, 0x17},
 181         {1024, 0x3b}, {1152, 0x18}, {1280, 0x3c}, {1536, 0x3d},
 182         {1792, 0x3e}, {1920, 0x1b}, {2048, 0x3f}, {2304, 0x1c},
 183         {2560, 0x1d}, {3072, 0x1e}, {3584, 0x7e}, {3840, 0x1f},
 184         {4096, 0x7f}, {4608, 0x5c}, {5120, 0x5d}, {6144, 0x5e},
 185         {7168, 0xbe}, {7680, 0x5f}, {8192, 0xbf}, {9216, 0x9c},
 186         {10240, 0x9d}, {12288, 0x9e}, {15360, 0x9f}
 187 };
 188
 189 int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
 190 {
 191         const struct mpc_i2c_divider *div = NULL;
 192         unsigned int pvr = mfspr(SPRN_PVR);
 193         u32 divider;
 194         int i;
 195
 196         if (!clock)
 197                 return -EINVAL;
 198
 199         /* Determine divider value */
 200         divider = mpc52xx_find_ipb_freq(node) / clock;
 201
 202         /*
 203          * We want to choose an FDR/DFSR that generates an I2C bus speed that
 204          * is equal to or lower than the requested speed.
 205          */
 206         for (i = 0; i < ARRAY_SIZE(mpc_i2c_dividers_52xx); i++) {
 207                 div = &mpc_i2c_dividers_52xx[i];
 208                 /* Old MPC5200 rev A CPUs do not support the high bits */
 209                 if (div->fdr & 0xc0 && pvr == 0x80822011)
 210                         continue;
 211                 if (div->divider >= divider)
 212                         break;
 213         }
 214
 215         return div ? (int)div->fdr : -EINVAL;
 216 }
 217
 218 static void mpc_i2c_setclock_52xx(struct device_node *node,
 219                                   struct mpc_i2c *i2c,
 220                                   u32 clock, u32 prescaler)
 221 {
 222         int ret, fdr;
 223
 224         ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
 225         fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
 226
 227         writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
 228
 229         if (ret >= 0)
 230                 dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
 231 }
 232 #else /* !CONFIG_PPC_MPC52xx */
 233 static void mpc_i2c_setclock_52xx(struct device_node *node,
 234                                   struct mpc_i2c *i2c,
 235                                   u32 clock, u32 prescaler)
 236 {
 237 }
 238 #endif /* CONFIG_PPC_MPC52xx*/
 239
 240 #ifdef CONFIG_FSL_SOC
 241 static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
 242         {160, 0x0120}, {192, 0x0121}, {224, 0x0122}, {256, 0x0123},
 243         {288, 0x0100}, {320, 0x0101}, {352, 0x0601}, {384, 0x0102},
 244         {416, 0x0602}, {448, 0x0126}, {480, 0x0103}, {512, 0x0127},
 245         {544, 0x0b03}, {576, 0x0104}, {608, 0x1603}, {640, 0x0105},
 246         {672, 0x2003}, {704, 0x0b05}, {736, 0x2b03}, {768, 0x0106},
 247         {800, 0x3603}, {832, 0x0b06}, {896, 0x012a}, {960, 0x0107},
 248         {1024, 0x012b}, {1088, 0x1607}, {1152, 0x0108}, {1216, 0x2b07},
 249         {1280, 0x0109}, {1408, 0x1609}, {1536, 0x010a}, {1664, 0x160a},
 250         {1792, 0x012e}, {1920, 0x010b}, {2048, 0x012f}, {2176, 0x2b0b},
 251         {2304, 0x010c}, {2560, 0x010d}, {2816, 0x2b0d}, {3072, 0x010e},
 252         {3328, 0x2b0e}, {3584, 0x0132}, {3840, 0x010f}, {4096, 0x0133},
 253         {4608, 0x0110}, {5120, 0x0111}, {6144, 0x0112}, {7168, 0x0136},
 254         {7680, 0x0113}, {8192, 0x0137}, {9216, 0x0114}, {10240, 0x0115},
 255         {12288, 0x0116}, {14336, 0x013a}, {15360, 0x0117}, {16384, 0x013b},
 256         {18432, 0x0118}, {20480, 0x0119}, {24576, 0x011a}, {28672, 0x013e},
 257         {30720, 0x011b}, {32768, 0x013f}, {36864, 0x011c}, {40960, 0x011d},
 258         {49152, 0x011e}, {61440, 0x011f}
 259 };
 260
 261 u32 mpc_i2c_get_sec_cfg_8xxx(void)
 262 {
 263         struct device_node *node = NULL;
 264         u32 __iomem *reg;
 265         u32 val = 0;
 266
 267         node = of_find_node_by_name(NULL, "global-utilities");
 268         if (node) {
 269                 const u32 *prop = of_get_property(node, "reg", NULL);
 270                 if (prop) {
 271                         /*
 272                          * Map and check POR Device Status Register 2
 273                          * (PORDEVSR2) at 0xE0014
 274                          */
 275                         reg = ioremap(get_immrbase() + *prop + 0x14, 0x4);
 276                         if (!reg)
 277                                 printk(KERN_ERR
 278                                        "Error: couldn't map PORDEVSR2\n");
 279                         else
 280                                 val = in_be32(reg) & 0x00000080; /* sec-cfg */
 281                         iounmap(reg);
 282                 }
 283         }
 284         if (node)
 285                 of_node_put(node);
 286
 287         return val;
 288 }
 289
 290 int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, u32 prescaler)
 291 {
 292         const struct mpc_i2c_divider *div = NULL;
 293         u32 divider;
 294         int i;
 295
 296         if (!clock)
 297                 return -EINVAL;
 298
 299         /* Determine proper divider value */
 300         if (of_device_is_compatible(node, "fsl,mpc8544-i2c"))
 301                 prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2;
 302         if (!prescaler)
 303                 prescaler = 1;
 304
 305         divider = fsl_get_sys_freq() / clock / prescaler;
 306
 307         pr_debug("I2C: src_clock=%d clock=%d divider=%d\n",
 308                  fsl_get_sys_freq(), clock, divider);
 309
 310         /*
 311          * We want to choose an FDR/DFSR that generates an I2C bus speed that
 312          * is equal to or lower than the requested speed.
 313          */
 314         for (i = 0; i < ARRAY_SIZE(mpc_i2c_dividers_8xxx); i++) {
 315                 div = &mpc_i2c_dividers_8xxx[i];
 316                 if (div->divider >= divider)
 317                         break;
 318         }
 319
 320         return div ? (int)div->fdr : -EINVAL;
 321 }
 322
 323 static void mpc_i2c_setclock_8xxx(struct device_node *node,
 324                                   struct mpc_i2c *i2c,
 325                                   u32 clock, u32 prescaler)
 326 {
 327         int ret, fdr;
 328
 329         ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
 330         fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
 331
 332         writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
 333         writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR);
 334
 335         if (ret >= 0)
 336                 dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n",
 337                          clock, fdr >> 8, fdr & 0xff);
 338 }
 339
 340 #else /* !CONFIG_FSL_SOC */
 341 static void mpc_i2c_setclock_8xxx(struct device_node *node,
 342                                   struct mpc_i2c *i2c,
 343                                   u32 clock, u32 prescaler)
 344 {
 345 }
 346 #endif /* CONFIG_FSL_SOC */
 347
 348 static void mpc_i2c_start(struct mpc_i2c *i2c)
 349 {
 350         /* Clear arbitration */
 351         writeb(0, i2c->base + MPC_I2C_SR);
 352         /* Start with MEN */
 353         writeccr(i2c, CCR_MEN);
 354 }
 355
 356 static void mpc_i2c_stop(struct mpc_i2c *i2c)
 357 {
 358         writeccr(i2c, CCR_MEN);
 359 }
 360
 361 static int mpc_write(struct mpc_i2c *i2c, int target,
 362                      const u8 *data, int length, int restart)
 363 {
 364         int i, result;
 365         unsigned timeout = i2c->adap.timeout;
 366         u32 flags = restart ? CCR_RSTA : 0;
 367
 368         /* Start with MEN */
 369         if (!restart)
 370                 writeccr(i2c, CCR_MEN);
 371         /* Start as master */
 372         writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);
 373         /* Write target byte */
 374         writeb((target << 1), i2c->base + MPC_I2C_DR);
 375
 376         result = i2c_wait(i2c, timeout, 1);
 377         if (result < 0)
 378                 return result;
 379
 380         for (i = 0; i < length; i++) {
 381                 /* Write data byte */
 382                 writeb(data[i], i2c->base + MPC_I2C_DR);
 383
 384                 result = i2c_wait(i2c, timeout, 1);
 385                 if (result < 0)
 386                         return result;
 387         }
 388
 389         return 0;
 390 }
 391
 392 static int mpc_read(struct mpc_i2c *i2c, int target,
 393                     u8 *data, int length, int restart)
 394 {
 395         unsigned timeout = i2c->adap.timeout;
 396         int i, result;
 397         u32 flags = restart ? CCR_RSTA : 0;
 398
 399         /* Start with MEN */
 400         if (!restart)
 401                 writeccr(i2c, CCR_MEN);
 402         /* Switch to read - restart */
 403         writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);
 404         /* Write target address byte - this time with the read flag set */
 405         writeb((target << 1) | 1, i2c->base + MPC_I2C_DR);
 406
 407         result = i2c_wait(i2c, timeout, 1);
 408         if (result < 0)
 409                 return result;
 410
 411         if (length) {
 412                 if (length == 1)
 413                         writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);
 414                 else
 415                         writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA);
 416                 /* Dummy read */
 417                 readb(i2c->base + MPC_I2C_DR);
 418         }
 419
 420         for (i = 0; i < length; i++) {
 421                 result = i2c_wait(i2c, timeout, 0);
 422                 if (result < 0)
 423                         return result;
 424
 425                 /* Generate txack on next to last byte */
 426                 if (i == length - 2)
 427                         writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);
 428                 /* Generate stop on last byte */
 429                 if (i == length - 1)
 430                         writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_TXAK);
 431                 data[i] = readb(i2c->base + MPC_I2C_DR);
 432         }
 433
 434         return length;
 435 }
 436
 437 static int mpc_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 438 {
 439         struct i2c_msg *pmsg;
 440         int i;
 441         int ret = 0;
 442         unsigned long orig_jiffies = jiffies;
 443         struct mpc_i2c *i2c = i2c_get_adapdata(adap);
 444
 445         mpc_i2c_start(i2c);
 446
 447         /* Allow bus up to 1s to become not busy */
 448         while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) {
 449                 if (signal_pending(current)) {
 450                         dev_dbg(i2c->dev, "Interrupted\n");
 451                         writeccr(i2c, 0);
 452                         return -EINTR;
 453                 }
 454                 if (time_after(jiffies, orig_jiffies + HZ)) {
 455                         dev_dbg(i2c->dev, "timeout\n");
 456                         if (readb(i2c->base + MPC_I2C_SR) ==
 457                             (CSR_MCF | CSR_MBB | CSR_RXAK))
 458                                 mpc_i2c_fixup(i2c);
 459                         return -EIO;
 460                 }
 461                 schedule();
 462         }
 463
 464         for (i = 0; ret >= 0 && i < num; i++) {
 465                 pmsg = &msgs[i];
 466                 dev_dbg(i2c->dev,
 467                         "Doing %s %d bytes to 0x%02x - %d of %d messages\n",
 468                         pmsg->flags & I2C_M_RD ? "read" : "write",
 469                         pmsg->len, pmsg->addr, i + 1, num);
 470                 if (pmsg->flags & I2C_M_RD)
 471                         ret =
 472                             mpc_read(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
 473                 else
 474                         ret =
 475                             mpc_write(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
 476         }
 477         mpc_i2c_stop(i2c);
 478         return (ret < 0) ? ret : num;
 479 }
 480
 481 static u32 mpc_functionality(struct i2c_adapter *adap)
 482 {
 483         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 484 }
 485
 486 static const struct i2c_algorithm mpc_algo = {
 487         .master_xfer = mpc_xfer,
 488         .functionality = mpc_functionality,
 489 };
 490
 491 static struct i2c_adapter mpc_ops = {
 492         .owner = THIS_MODULE,
 493         .name = "MPC adapter",
 494         .algo = &mpc_algo,
 495         .timeout = HZ,
 496 };
 497
 498 static int __devinit fsl_i2c_probe(struct of_device *op,
 499                                    const struct of_device_id *match)
 500 {
 501         struct mpc_i2c *i2c;
 502         const u32 *prop;
 503         u32 clock = 0;
 504         int result = 0;
 505         int plen;
 506
 507         i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
 508         if (!i2c)
 509                 return -ENOMEM;
 510
 511         i2c->dev = &op->dev; /* for debug and error output */
 512
 513         init_waitqueue_head(&i2c->queue);
 514
 515         i2c->base = of_iomap(op->node, 0);
 516         if (!i2c->base) {
 517                 dev_err(i2c->dev, "failed to map controller\n");
 518                 result = -ENOMEM;
 519                 goto fail_map;
 520         }
 521
 522         i2c->irq = irq_of_parse_and_map(op->node, 0);
 523         if (i2c->irq != NO_IRQ) { /* i2c->irq = NO_IRQ implies polling */
 524                 result = request_irq(i2c->irq, mpc_i2c_isr,
 525                                      IRQF_SHARED, "i2c-mpc", i2c);
 526                 if (result < 0) {
 527                         dev_err(i2c->dev, "failed to attach interrupt\n");
 528                         goto fail_request;
 529                 }
 530         }
 531
 532         if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
 533                 prop = of_get_property(op->node, "clock-frequency", &plen);
 534                 if (prop && plen == sizeof(u32))
 535                         clock = *prop;
 536
 537                 if (match->data) {
 538                         struct mpc_i2c_match_data *data =
 539                                 (struct mpc_i2c_match_data *)match->data;
 540                         data->setclock(op->node, i2c, clock, data->prescaler);
 541                 } else {
 542                         /* Backwards compatibility */
 543                         if (of_get_property(op->node, "dfsrr", NULL))
 544                                 mpc_i2c_setclock_8xxx(op->node, i2c,
 545                                                       clock, 0);
 546                 }
 547         }
 548
 549         dev_set_drvdata(&op->dev, i2c);
 550
 551         i2c->adap = mpc_ops;
 552         i2c_set_adapdata(&i2c->adap, i2c);
 553         i2c->adap.dev.parent = &op->dev;
 554
 555         result = i2c_add_adapter(&i2c->adap);
 556         if (result < 0) {
 557                 dev_err(i2c->dev, "failed to add adapter\n");
 558                 goto fail_add;
 559         }
 560         of_register_i2c_devices(&i2c->adap, op->node);
 561
 562         return result;
 563
 564  fail_add:
 565         dev_set_drvdata(&op->dev, NULL);
 566         free_irq(i2c->irq, i2c);
 567  fail_request:
 568         irq_dispose_mapping(i2c->irq);
 569         iounmap(i2c->base);
 570  fail_map:
 571         kfree(i2c);
 572         return result;
 573 };
 574
 575 static int __devexit fsl_i2c_remove(struct of_device *op)
 576 {
 577         struct mpc_i2c *i2c = dev_get_drvdata(&op->dev);
 578
 579         i2c_del_adapter(&i2c->adap);
 580         dev_set_drvdata(&op->dev, NULL);
 581
 582         if (i2c->irq != NO_IRQ)
 583                 free_irq(i2c->irq, i2c);
 584
 585         irq_dispose_mapping(i2c->irq);
 586         iounmap(i2c->base);
 587         kfree(i2c);
 588         return 0;
 589 };
 590
 591 static const struct of_device_id mpc_i2c_of_match[] = {
 592         {.compatible = "mpc5200-i2c",
 593          .data = &(struct mpc_i2c_match_data) {
 594                         .setclock = mpc_i2c_setclock_52xx,
 595                 },
 596         },
 597         {.compatible = "fsl,mpc5200b-i2c",
 598          .data = &(struct mpc_i2c_match_data) {
 599                         .setclock = mpc_i2c_setclock_52xx,
 600                 },
 601         },
 602         {.compatible = "fsl,mpc5200-i2c",
 603          .data = &(struct mpc_i2c_match_data) {
 604                         .setclock = mpc_i2c_setclock_52xx,
 605                 },
 606         },
 607         {.compatible = "fsl,mpc8313-i2c",
 608          .data = &(struct mpc_i2c_match_data) {
 609                         .setclock = mpc_i2c_setclock_8xxx,
 610                 },
 611         },
 612         {.compatible = "fsl,mpc8543-i2c",
 613          .data = &(struct mpc_i2c_match_data) {
 614                         .setclock = mpc_i2c_setclock_8xxx,
 615                         .prescaler = 2,
 616                 },
 617         },
 618         {.compatible = "fsl,mpc8544-i2c",
 619          .data = &(struct mpc_i2c_match_data) {
 620                         .setclock = mpc_i2c_setclock_8xxx,
 621                         .prescaler = 3,
 622                 },
 623         /* Backward compatibility */
 624         },
 625         {.compatible = "fsl-i2c", },
 626         {},
 627 };
 628
 629 MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
 630
 631
 632 /* Structure for a device driver */
 633 static struct of_platform_driver mpc_i2c_driver = {
 634         .match_table    = mpc_i2c_of_match,
 635         .probe          = fsl_i2c_probe,
 636         .remove         = __devexit_p(fsl_i2c_remove),
 637         .driver         = {
 638                 .owner  = THIS_MODULE,
 639                 .name   = DRV_NAME,
 640         },
 641 };
 642
 643 static int __init fsl_i2c_init(void)
 644 {
 645         int rv;
 646
 647         rv = of_register_platform_driver(&mpc_i2c_driver);
 648         if (rv)
 649                 printk(KERN_ERR DRV_NAME
 650                        " of_register_platform_driver failed (%i)\n", rv);
 651         return rv;
 652 }
 653
 654 static void __exit fsl_i2c_exit(void)
 655 {
 656         of_unregister_platform_driver(&mpc_i2c_driver);
 657 }
 658
 659 module_init(fsl_i2c_init);
 660 module_exit(fsl_i2c_exit);
 661
 662 MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
 663 MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
 664                    "MPC824x/85xx/52xx processors");
 665 MODULE_LICENSE("GPL");