drivers/i2c/busses/i2c-amd756.c

   1 /*
   2     amd756.c - Part of lm_sensors, Linux kernel modules for hardware
   3               monitoring
   4
   5     Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
   6
   7     Shamelessly ripped from i2c-piix4.c:
   8
   9     Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> and
  10     Philip Edelbrock <phil@netroedge.com>
  11
  12     This program is free software; you can redistribute it and/or modify
  13     it under the terms of the GNU General Public License as published by
  14     the Free Software Foundation; either version 2 of the License, or
  15     (at your option) any later version.
  16
  17     This program is distributed in the hope that it will be useful,
  18     but WITHOUT ANY WARRANTY; without even the implied warranty of
  19     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20     GNU General Public License for more details.
  21
  22     You should have received a copy of the GNU General Public License
  23     along with this program; if not, write to the Free Software
  24     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25 */
  26
  27 /*
  28     2002-04-08: Added nForce support. (Csaba Halasz)
  29     2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)
  30     2002-12-28: Rewritten into something that resembles a Linux driver (hch)
  31     2003-11-29: Added back AMD8111 removed by the previous rewrite.
  32                 (Philip Pokorny)
  33 */
  34
  35 /*
  36    Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce
  37    Note: we assume there can only be one device, with one SMBus interface.
  38 */
  39
  40 #include <linux/module.h>
  41 #include <linux/pci.h>
  42 #include <linux/kernel.h>
  43 #include <linux/delay.h>
  44 #include <linux/stddef.h>
  45 #include <linux/ioport.h>
  46 #include <linux/i2c.h>
  47 #include <linux/init.h>
  48 #include <asm/io.h>
  49
  50 /* AMD756 SMBus address offsets */
  51 #define SMB_ADDR_OFFSET         0xE0
  52 #define SMB_IOSIZE              16
  53 #define SMB_GLOBAL_STATUS       (0x0 + amd756_ioport)
  54 #define SMB_GLOBAL_ENABLE       (0x2 + amd756_ioport)
  55 #define SMB_HOST_ADDRESS        (0x4 + amd756_ioport)
  56 #define SMB_HOST_DATA           (0x6 + amd756_ioport)
  57 #define SMB_HOST_COMMAND        (0x8 + amd756_ioport)
  58 #define SMB_HOST_BLOCK_DATA     (0x9 + amd756_ioport)
  59 #define SMB_HAS_DATA            (0xA + amd756_ioport)
  60 #define SMB_HAS_DEVICE_ADDRESS  (0xC + amd756_ioport)
  61 #define SMB_HAS_HOST_ADDRESS    (0xE + amd756_ioport)
  62 #define SMB_SNOOP_ADDRESS       (0xF + amd756_ioport)
  63
  64 /* PCI Address Constants */
  65
  66 /* address of I/O space */
  67 #define SMBBA           0x058           /* mh */
  68 #define SMBBANFORCE     0x014
  69
  70 /* general configuration */
  71 #define SMBGCFG         0x041           /* mh */
  72
  73 /* silicon revision code */
  74 #define SMBREV          0x008
  75
  76 /* Other settings */
  77 #define MAX_TIMEOUT     500
  78
  79 /* AMD756 constants */
  80 #define AMD756_QUICK            0x00
  81 #define AMD756_BYTE             0x01
  82 #define AMD756_BYTE_DATA        0x02
  83 #define AMD756_WORD_DATA        0x03
  84 #define AMD756_PROCESS_CALL     0x04
  85 #define AMD756_BLOCK_DATA       0x05
  86
  87 static struct pci_driver amd756_driver;
  88 static unsigned short amd756_ioport;
  89
  90 /*
  91   SMBUS event = I/O 28-29 bit 11
  92      see E0 for the status bits and enabled in E2
  93
  94 */
  95 #define GS_ABRT_STS     (1 << 0)
  96 #define GS_COL_STS      (1 << 1)
  97 #define GS_PRERR_STS    (1 << 2)
  98 #define GS_HST_STS      (1 << 3)
  99 #define GS_HCYC_STS     (1 << 4)
 100 #define GS_TO_STS       (1 << 5)
 101 #define GS_SMB_STS      (1 << 11)
 102
 103 #define GS_CLEAR_STS    (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
 104                          GS_HCYC_STS | GS_TO_STS )
 105
 106 #define GE_CYC_TYPE_MASK        (7)
 107 #define GE_HOST_STC             (1 << 3)
 108 #define GE_ABORT                (1 << 5)
 109
 110
 111 static int amd756_transaction(struct i2c_adapter *adap)
 112 {
 113         int temp;
 114         int result = 0;
 115         int timeout = 0;
 116
 117         dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
 118                 "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
 119                 inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
 120                 inb_p(SMB_HOST_DATA));
 121
 122         /* Make sure the SMBus host is ready to start transmitting */
 123         if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
 124                 dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp);
 125                 do {
 126                         msleep(1);
 127                         temp = inw_p(SMB_GLOBAL_STATUS);
 128                 } while ((temp & (GS_HST_STS | GS_SMB_STS)) &&
 129                          (timeout++ < MAX_TIMEOUT));
 130                 /* If the SMBus is still busy, we give up */
 131                 if (timeout >= MAX_TIMEOUT) {
 132                         dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp);
 133                         goto abort;
 134                 }
 135                 timeout = 0;
 136         }
 137
 138         /* start the transaction by setting the start bit */
 139         outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);
 140
 141         /* We will always wait for a fraction of a second! */
 142         do {
 143                 msleep(1);
 144                 temp = inw_p(SMB_GLOBAL_STATUS);
 145         } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT));
 146
 147         /* If the SMBus is still busy, we give up */
 148         if (timeout >= MAX_TIMEOUT) {
 149                 dev_dbg(&adap->dev, "Completion timeout!\n");
 150                 goto abort;
 151         }
 152
 153         if (temp & GS_PRERR_STS) {
 154                 result = -ENXIO;
 155                 dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
 156         }
 157
 158         if (temp & GS_COL_STS) {
 159                 result = -EIO;
 160                 dev_warn(&adap->dev, "SMBus collision!\n");
 161         }
 162
 163         if (temp & GS_TO_STS) {
 164                 result = -ETIMEDOUT;
 165                 dev_dbg(&adap->dev, "SMBus protocol timeout!\n");
 166         }
 167
 168         if (temp & GS_HCYC_STS)
 169                 dev_dbg(&adap->dev, "SMBus protocol success!\n");
 170
 171         outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
 172
 173 #ifdef DEBUG
 174         if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
 175                 dev_dbg(&adap->dev,
 176                         "Failed reset at end of transaction (%04x)\n", temp);
 177         }
 178 #endif
 179
 180         dev_dbg(&adap->dev,
 181                 "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
 182                 inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),
 183                 inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));
 184
 185         return result;
 186
 187  abort:
 188         dev_warn(&adap->dev, "Sending abort\n");
 189         outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
 190         msleep(100);
 191         outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
 192         return -EIO;
 193 }
 194
 195 /* Return negative errno on error. */
 196 static s32 amd756_access(struct i2c_adapter * adap, u16 addr,
 197                   unsigned short flags, char read_write,
 198                   u8 command, int size, union i2c_smbus_data * data)
 199 {
 200         int i, len;
 201         int status;
 202
 203         /** TODO: Should I supporte the 10-bit transfers? */
 204         switch (size) {
 205         case I2C_SMBUS_PROC_CALL:
 206                 dev_dbg(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
 207                 /* TODO: Well... It is supported, I'm just not sure what to do here... */
 208                 return -EOPNOTSUPP;
 209         case I2C_SMBUS_QUICK:
 210                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 211                        SMB_HOST_ADDRESS);
 212                 size = AMD756_QUICK;
 213                 break;
 214         case I2C_SMBUS_BYTE:
 215                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 216                        SMB_HOST_ADDRESS);
 217                 if (read_write == I2C_SMBUS_WRITE)
 218                         outb_p(command, SMB_HOST_DATA);
 219                 size = AMD756_BYTE;
 220                 break;
 221         case I2C_SMBUS_BYTE_DATA:
 222                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 223                        SMB_HOST_ADDRESS);
 224                 outb_p(command, SMB_HOST_COMMAND);
 225                 if (read_write == I2C_SMBUS_WRITE)
 226                         outw_p(data->byte, SMB_HOST_DATA);
 227                 size = AMD756_BYTE_DATA;
 228                 break;
 229         case I2C_SMBUS_WORD_DATA:
 230                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 231                        SMB_HOST_ADDRESS);
 232                 outb_p(command, SMB_HOST_COMMAND);
 233                 if (read_write == I2C_SMBUS_WRITE)
 234                         outw_p(data->word, SMB_HOST_DATA);      /* TODO: endian???? */
 235                 size = AMD756_WORD_DATA;
 236                 break;
 237         case I2C_SMBUS_BLOCK_DATA:
 238                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 239                        SMB_HOST_ADDRESS);
 240                 outb_p(command, SMB_HOST_COMMAND);
 241                 if (read_write == I2C_SMBUS_WRITE) {
 242                         len = data->block[0];
 243                         if (len < 0)
 244                                 len = 0;
 245                         if (len > 32)
 246                                 len = 32;
 247                         outw_p(len, SMB_HOST_DATA);
 248                         /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
 249                         for (i = 1; i <= len; i++)
 250                                 outb_p(data->block[i],
 251                                        SMB_HOST_BLOCK_DATA);
 252                 }
 253                 size = AMD756_BLOCK_DATA;
 254                 break;
 255         }
 256
 257         /* How about enabling interrupts... */
 258         outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);
 259
 260         status = amd756_transaction(adap);
 261         if (status)
 262                 return status;
 263
 264         if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))
 265                 return 0;
 266
 267
 268         switch (size) {
 269         case AMD756_BYTE:
 270                 data->byte = inw_p(SMB_HOST_DATA);
 271                 break;
 272         case AMD756_BYTE_DATA:
 273                 data->byte = inw_p(SMB_HOST_DATA);
 274                 break;
 275         case AMD756_WORD_DATA:
 276                 data->word = inw_p(SMB_HOST_DATA);      /* TODO: endian???? */
 277                 break;
 278         case AMD756_BLOCK_DATA:
 279                 data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;
 280                 if(data->block[0] > 32)
 281                         data->block[0] = 32;
 282                 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
 283                 for (i = 1; i <= data->block[0]; i++)
 284                         data->block[i] = inb_p(SMB_HOST_BLOCK_DATA);
 285                 break;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static u32 amd756_func(struct i2c_adapter *adapter)
 292 {
 293         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 294             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 295             I2C_FUNC_SMBUS_BLOCK_DATA;
 296 }
 297
 298 static const struct i2c_algorithm smbus_algorithm = {
 299         .smbus_xfer     = amd756_access,
 300         .functionality  = amd756_func,
 301 };
 302
 303 struct i2c_adapter amd756_smbus = {
 304         .owner          = THIS_MODULE,
 305         .id             = I2C_HW_SMBUS_AMD756,
 306         .class          = I2C_CLASS_HWMON,
 307         .algo           = &smbus_algorithm,
 308 };
 309
 310 enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 };
 311 static const char* chipname[] = {
 312         "AMD756", "AMD766", "AMD768",
 313         "nVidia nForce", "AMD8111",
 314 };
 315
 316 static struct pci_device_id amd756_ids[] = {
 317         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B),
 318           .driver_data = AMD756 },
 319         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413),
 320           .driver_data = AMD766 },
 321         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443),
 322           .driver_data = AMD768 },
 323         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS),
 324           .driver_data = AMD8111 },
 325         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS),
 326           .driver_data = NFORCE },
 327         { 0, }
 328 };
 329
 330 MODULE_DEVICE_TABLE (pci, amd756_ids);
 331
 332 static int __devinit amd756_probe(struct pci_dev *pdev,
 333                                   const struct pci_device_id *id)
 334 {
 335         int nforce = (id->driver_data == NFORCE);
 336         int error;
 337         u8 temp;
 338
 339         /* driver_data might come from user-space, so check it */
 340         if (id->driver_data >= ARRAY_SIZE(chipname))
 341                 return -EINVAL;
 342
 343         if (amd756_ioport) {
 344                 dev_err(&pdev->dev, "Only one device supported "
 345                        "(you have a strange motherboard, btw)\n");
 346                 return -ENODEV;
 347         }
 348
 349         if (nforce) {
 350                 if (PCI_FUNC(pdev->devfn) != 1)
 351                         return -ENODEV;
 352
 353                 pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);
 354                 amd756_ioport &= 0xfffc;
 355         } else { /* amd */
 356                 if (PCI_FUNC(pdev->devfn) != 3)
 357                         return -ENODEV;
 358
 359                 pci_read_config_byte(pdev, SMBGCFG, &temp);
 360                 if ((temp & 128) == 0) {
 361                         dev_err(&pdev->dev,
 362                                 "Error: SMBus controller I/O not enabled!\n");
 363                         return -ENODEV;
 364                 }
 365
 366                 /* Determine the address of the SMBus areas */
 367                 /* Technically it is a dword but... */
 368                 pci_read_config_word(pdev, SMBBA, &amd756_ioport);
 369                 amd756_ioport &= 0xff00;
 370                 amd756_ioport += SMB_ADDR_OFFSET;
 371         }
 372
 373         if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
 374                 dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
 375                         amd756_ioport);
 376                 return -ENODEV;
 377         }
 378
 379         pci_read_config_byte(pdev, SMBREV, &temp);
 380         dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
 381         dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport);
 382
 383         /* set up the sysfs linkage to our parent device */
 384         amd756_smbus.dev.parent = &pdev->dev;
 385
 386         sprintf(amd756_smbus.name, "SMBus %s adapter at %04x",
 387                 chipname[id->driver_data], amd756_ioport);
 388
 389         error = i2c_add_adapter(&amd756_smbus);
 390         if (error) {
 391                 dev_err(&pdev->dev,
 392                         "Adapter registration failed, module not inserted\n");
 393                 goto out_err;
 394         }
 395
 396         return 0;
 397
 398  out_err:
 399         release_region(amd756_ioport, SMB_IOSIZE);
 400         return error;
 401 }
 402
 403 static void __devexit amd756_remove(struct pci_dev *dev)
 404 {
 405         i2c_del_adapter(&amd756_smbus);
 406         release_region(amd756_ioport, SMB_IOSIZE);
 407 }
 408
 409 static struct pci_driver amd756_driver = {
 410         .name           = "amd756_smbus",
 411         .id_table       = amd756_ids,
 412         .probe          = amd756_probe,
 413         .remove         = __devexit_p(amd756_remove),
 414         .dynids.use_driver_data = 1,
 415 };
 416
 417 static int __init amd756_init(void)
 418 {
 419         return pci_register_driver(&amd756_driver);
 420 }
 421
 422 static void __exit amd756_exit(void)
 423 {
 424         pci_unregister_driver(&amd756_driver);
 425 }
 426
 427 MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
 428 MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
 429 MODULE_LICENSE("GPL");
 430
 431 EXPORT_SYMBOL(amd756_smbus);
 432
 433 module_init(amd756_init)
 434 module_exit(amd756_exit)