drivers/i2c/busses/i2c-ali1563.c

   1 /**
   2  *      i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
   3  *
   4  *      Copyright (C) 2004 Patrick Mochel
   5  *                    2005 Rudolf Marek <r.marek@assembler.cz>
   6  *
   7  *      The 1563 southbridge is deceptively similar to the 1533, with a
   8  *      few notable exceptions. One of those happens to be the fact they
   9  *      upgraded the i2c core to be 2.0 compliant, and happens to be almost
  10  *      identical to the i2c controller found in the Intel 801 south
  11  *      bridges.
  12  *
  13  *      This driver is based on a mix of the 15x3, 1535, and i801 drivers,
  14  *      with a little help from the ALi 1563 spec.
  15  *
  16  *      This file is released under the GPLv2
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/delay.h>
  21 #include <linux/i2c.h>
  22 #include <linux/pci.h>
  23 #include <linux/init.h>
  24 #include <linux/acpi.h>
  25
  26 #define ALI1563_MAX_TIMEOUT     500
  27 #define ALI1563_SMBBA           0x80
  28 #define ALI1563_SMB_IOEN        1
  29 #define ALI1563_SMB_HOSTEN      2
  30 #define ALI1563_SMB_IOSIZE      16
  31
  32 #define SMB_HST_STS     (ali1563_smba + 0)
  33 #define SMB_HST_CNTL1   (ali1563_smba + 1)
  34 #define SMB_HST_CNTL2   (ali1563_smba + 2)
  35 #define SMB_HST_CMD     (ali1563_smba + 3)
  36 #define SMB_HST_ADD     (ali1563_smba + 4)
  37 #define SMB_HST_DAT0    (ali1563_smba + 5)
  38 #define SMB_HST_DAT1    (ali1563_smba + 6)
  39 #define SMB_BLK_DAT     (ali1563_smba + 7)
  40
  41 #define HST_STS_BUSY    0x01
  42 #define HST_STS_INTR    0x02
  43 #define HST_STS_DEVERR  0x04
  44 #define HST_STS_BUSERR  0x08
  45 #define HST_STS_FAIL    0x10
  46 #define HST_STS_DONE    0x80
  47 #define HST_STS_BAD     0x1c
  48
  49
  50 #define HST_CNTL1_TIMEOUT       0x80
  51 #define HST_CNTL1_LAST          0x40
  52
  53 #define HST_CNTL2_KILL          0x04
  54 #define HST_CNTL2_START         0x40
  55 #define HST_CNTL2_QUICK         0x00
  56 #define HST_CNTL2_BYTE          0x01
  57 #define HST_CNTL2_BYTE_DATA     0x02
  58 #define HST_CNTL2_WORD_DATA     0x03
  59 #define HST_CNTL2_BLOCK         0x05
  60
  61
  62 #define HST_CNTL2_SIZEMASK      0x38
  63
  64 static struct pci_driver ali1563_pci_driver;
  65 static unsigned short ali1563_smba;
  66
  67 static int ali1563_transaction(struct i2c_adapter * a, int size)
  68 {
  69         u32 data;
  70         int timeout;
  71         int status = -EIO;
  72
  73         dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
  74                 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
  75                 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
  76                 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
  77                 inb_p(SMB_HST_DAT1));
  78
  79         data = inb_p(SMB_HST_STS);
  80         if (data & HST_STS_BAD) {
  81                 dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
  82                 outb_p(data | HST_STS_BAD,SMB_HST_STS);
  83                 data = inb_p(SMB_HST_STS);
  84                 if (data & HST_STS_BAD)
  85                         return -EBUSY;
  86         }
  87         outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
  88
  89         timeout = ALI1563_MAX_TIMEOUT;
  90         do {
  91                 msleep(1);
  92         } while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);
  93
  94         dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
  95                 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
  96                 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
  97                 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
  98                 inb_p(SMB_HST_DAT1));
  99
 100         if (timeout && !(data & HST_STS_BAD))
 101                 return 0;
 102
 103         if (!timeout) {
 104                 dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
 105                 /* Issue 'kill' to host controller */
 106                 outb_p(HST_CNTL2_KILL,SMB_HST_CNTL2);
 107                 data = inb_p(SMB_HST_STS);
 108                 status = -ETIMEDOUT;
 109         }
 110
 111         /* device error - no response, ignore the autodetection case */
 112         if (data & HST_STS_DEVERR) {
 113                 if (size != HST_CNTL2_QUICK)
 114                         dev_err(&a->dev, "Device error!\n");
 115                 status = -ENXIO;
 116         }
 117         /* bus collision */
 118         if (data & HST_STS_BUSERR) {
 119                 dev_err(&a->dev, "Bus collision!\n");
 120                 /* Issue timeout, hoping it helps */
 121                 outb_p(HST_CNTL1_TIMEOUT,SMB_HST_CNTL1);
 122         }
 123
 124         if (data & HST_STS_FAIL) {
 125                 dev_err(&a->dev, "Cleaning fail after KILL!\n");
 126                 outb_p(0x0,SMB_HST_CNTL2);
 127         }
 128
 129         return status;
 130 }
 131
 132 static int ali1563_block_start(struct i2c_adapter * a)
 133 {
 134         u32 data;
 135         int timeout;
 136         int status = -EIO;
 137
 138         dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
 139                 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
 140                 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
 141                 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
 142                 inb_p(SMB_HST_DAT1));
 143
 144         data = inb_p(SMB_HST_STS);
 145         if (data & HST_STS_BAD) {
 146                 dev_warn(&a->dev,"ali1563: Trying to reset busy device\n");
 147                 outb_p(data | HST_STS_BAD,SMB_HST_STS);
 148                 data = inb_p(SMB_HST_STS);
 149                 if (data & HST_STS_BAD)
 150                         return -EBUSY;
 151         }
 152
 153         /* Clear byte-ready bit */
 154         outb_p(data | HST_STS_DONE, SMB_HST_STS);
 155
 156         /* Start transaction and wait for byte-ready bit to be set */
 157         outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
 158
 159         timeout = ALI1563_MAX_TIMEOUT;
 160         do {
 161                 msleep(1);
 162         } while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);
 163
 164         dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
 165                 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
 166                 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
 167                 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
 168                 inb_p(SMB_HST_DAT1));
 169
 170         if (timeout && !(data & HST_STS_BAD))
 171                 return 0;
 172
 173         if (timeout == 0)
 174                 status = -ETIMEDOUT;
 175
 176         if (data & HST_STS_DEVERR)
 177                 status = -ENXIO;
 178
 179         dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
 180                 timeout ? "" : "Timeout ",
 181                 data & HST_STS_FAIL ? "Transaction Failed " : "",
 182                 data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
 183                 data & HST_STS_DEVERR ? "Device Error " : "",
 184                 !(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
 185         return status;
 186 }
 187
 188 static int ali1563_block(struct i2c_adapter * a, union i2c_smbus_data * data, u8 rw)
 189 {
 190         int i, len;
 191         int error = 0;
 192
 193         /* Do we need this? */
 194         outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
 195
 196         if (rw == I2C_SMBUS_WRITE) {
 197                 len = data->block[0];
 198                 if (len < 1)
 199                         len = 1;
 200                 else if (len > 32)
 201                         len = 32;
 202                 outb_p(len,SMB_HST_DAT0);
 203                 outb_p(data->block[1],SMB_BLK_DAT);
 204         } else
 205                 len = 32;
 206
 207         outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2);
 208
 209         for (i = 0; i < len; i++) {
 210                 if (rw == I2C_SMBUS_WRITE) {
 211                         outb_p(data->block[i + 1], SMB_BLK_DAT);
 212                         if ((error = ali1563_block_start(a)))
 213                                 break;
 214                 } else {
 215                         if ((error = ali1563_block_start(a)))
 216                                 break;
 217                         if (i == 0) {
 218                                 len = inb_p(SMB_HST_DAT0);
 219                                 if (len < 1)
 220                                         len = 1;
 221                                 else if (len > 32)
 222                                         len = 32;
 223                         }
 224                         data->block[i+1] = inb_p(SMB_BLK_DAT);
 225                 }
 226         }
 227         /* Do we need this? */
 228         outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
 229         return error;
 230 }
 231
 232 static s32 ali1563_access(struct i2c_adapter * a, u16 addr,
 233                           unsigned short flags, char rw, u8 cmd,
 234                           int size, union i2c_smbus_data * data)
 235 {
 236         int error = 0;
 237         int timeout;
 238         u32 reg;
 239
 240         for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
 241                 if (!(reg = inb_p(SMB_HST_STS) & HST_STS_BUSY))
 242                         break;
 243         }
 244         if (!timeout)
 245                 dev_warn(&a->dev,"SMBus not idle. HST_STS = %02x\n",reg);
 246         outb_p(0xff,SMB_HST_STS);
 247
 248         /* Map the size to what the chip understands */
 249         switch (size) {
 250         case I2C_SMBUS_QUICK:
 251                 size = HST_CNTL2_QUICK;
 252                 break;
 253         case I2C_SMBUS_BYTE:
 254                 size = HST_CNTL2_BYTE;
 255                 break;
 256         case I2C_SMBUS_BYTE_DATA:
 257                 size = HST_CNTL2_BYTE_DATA;
 258                 break;
 259         case I2C_SMBUS_WORD_DATA:
 260                 size = HST_CNTL2_WORD_DATA;
 261                 break;
 262         case I2C_SMBUS_BLOCK_DATA:
 263                 size = HST_CNTL2_BLOCK;
 264                 break;
 265         default:
 266                 dev_warn(&a->dev, "Unsupported transaction %d\n", size);
 267                 error = -EOPNOTSUPP;
 268                 goto Done;
 269         }
 270
 271         outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
 272         outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) | (size << 3), SMB_HST_CNTL2);
 273
 274         /* Write the command register */
 275
 276         switch(size) {
 277         case HST_CNTL2_BYTE:
 278                 if (rw== I2C_SMBUS_WRITE)
 279                         /* Beware it uses DAT0 register and not CMD! */
 280                         outb_p(cmd, SMB_HST_DAT0);
 281                 break;
 282         case HST_CNTL2_BYTE_DATA:
 283                 outb_p(cmd, SMB_HST_CMD);
 284                 if (rw == I2C_SMBUS_WRITE)
 285                         outb_p(data->byte, SMB_HST_DAT0);
 286                 break;
 287         case HST_CNTL2_WORD_DATA:
 288                 outb_p(cmd, SMB_HST_CMD);
 289                 if (rw == I2C_SMBUS_WRITE) {
 290                         outb_p(data->word & 0xff, SMB_HST_DAT0);
 291                         outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
 292                 }
 293                 break;
 294         case HST_CNTL2_BLOCK:
 295                 outb_p(cmd, SMB_HST_CMD);
 296                 error = ali1563_block(a,data,rw);
 297                 goto Done;
 298         }
 299
 300         if ((error = ali1563_transaction(a, size)))
 301                 goto Done;
 302
 303         if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
 304                 goto Done;
 305
 306         switch (size) {
 307         case HST_CNTL2_BYTE:    /* Result put in SMBHSTDAT0 */
 308                 data->byte = inb_p(SMB_HST_DAT0);
 309                 break;
 310         case HST_CNTL2_BYTE_DATA:
 311                 data->byte = inb_p(SMB_HST_DAT0);
 312                 break;
 313         case HST_CNTL2_WORD_DATA:
 314                 data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
 315                 break;
 316         }
 317 Done:
 318         return error;
 319 }
 320
 321 static u32 ali1563_func(struct i2c_adapter * a)
 322 {
 323         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 324             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 325             I2C_FUNC_SMBUS_BLOCK_DATA;
 326 }
 327
 328
 329 static int __devinit ali1563_setup(struct pci_dev * dev)
 330 {
 331         u16 ctrl;
 332
 333         pci_read_config_word(dev,ALI1563_SMBBA,&ctrl);
 334
 335         /* SMB I/O Base in high 12 bits and must be aligned with the
 336          * size of the I/O space. */
 337         ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
 338         if (!ali1563_smba) {
 339                 dev_warn(&dev->dev,"ali1563_smba Uninitialized\n");
 340                 goto Err;
 341         }
 342
 343         /* Check if device is enabled */
 344         if (!(ctrl & ALI1563_SMB_HOSTEN)) {
 345                 dev_warn(&dev->dev, "Host Controller not enabled\n");
 346                 goto Err;
 347         }
 348         if (!(ctrl & ALI1563_SMB_IOEN)) {
 349                 dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
 350                 pci_write_config_word(dev, ALI1563_SMBBA,
 351                                       ctrl | ALI1563_SMB_IOEN);
 352                 pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
 353                 if (!(ctrl & ALI1563_SMB_IOEN)) {
 354                         dev_err(&dev->dev, "I/O space still not enabled, "
 355                                 "giving up\n");
 356                         goto Err;
 357                 }
 358         }
 359
 360         if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
 361                               ali1563_pci_driver.name))
 362                 goto Err;
 363
 364         if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
 365                             ali1563_pci_driver.name)) {
 366                 dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
 367                         ali1563_smba);
 368                 goto Err;
 369         }
 370         dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);
 371
 372         return 0;
 373 Err:
 374         return -ENODEV;
 375 }
 376
 377 static void ali1563_shutdown(struct pci_dev *dev)
 378 {
 379         release_region(ali1563_smba,ALI1563_SMB_IOSIZE);
 380 }
 381
 382 static const struct i2c_algorithm ali1563_algorithm = {
 383         .smbus_xfer     = ali1563_access,
 384         .functionality  = ali1563_func,
 385 };
 386
 387 static struct i2c_adapter ali1563_adapter = {
 388         .owner  = THIS_MODULE,
 389         .class  = I2C_CLASS_HWMON | I2C_CLASS_SPD,
 390         .algo   = &ali1563_algorithm,
 391 };
 392
 393 static int __devinit ali1563_probe(struct pci_dev * dev,
 394                                 const struct pci_device_id * id_table)
 395 {
 396         int error;
 397
 398         if ((error = ali1563_setup(dev)))
 399                 goto exit;
 400         ali1563_adapter.dev.parent = &dev->dev;
 401         snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
 402                  "SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
 403         if ((error = i2c_add_adapter(&ali1563_adapter)))
 404                 goto exit_shutdown;
 405         return 0;
 406
 407 exit_shutdown:
 408         ali1563_shutdown(dev);
 409 exit:
 410         dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
 411         return error;
 412 }
 413
 414 static void __devexit ali1563_remove(struct pci_dev * dev)
 415 {
 416         i2c_del_adapter(&ali1563_adapter);
 417         ali1563_shutdown(dev);
 418 }
 419
 420 static const struct pci_device_id ali1563_id_table[] __devinitconst = {
 421         { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
 422         {},
 423 };
 424
 425 MODULE_DEVICE_TABLE (pci, ali1563_id_table);
 426
 427 static struct pci_driver ali1563_pci_driver = {
 428         .name           = "ali1563_smbus",
 429         .id_table       = ali1563_id_table,
 430         .probe          = ali1563_probe,
 431         .remove         = __devexit_p(ali1563_remove),
 432 };
 433
 434 static int __init ali1563_init(void)
 435 {
 436         return pci_register_driver(&ali1563_pci_driver);
 437 }
 438
 439 module_init(ali1563_init);
 440
 441 static void __exit ali1563_exit(void)
 442 {
 443         pci_unregister_driver(&ali1563_pci_driver);
 444 }
 445
 446 module_exit(ali1563_exit);
 447
 448 MODULE_LICENSE("GPL");