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