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/sched.h>
  46 #include <linux/ioport.h>
  47 #include <linux/i2c.h>
  48 #include <linux/init.h>
  49 #include <asm/io.h>
  50
  51 /* AMD756 SMBus address offsets */
  52 #define SMB_ADDR_OFFSET         0xE0
  53 #define SMB_IOSIZE              16
  54 #define SMB_GLOBAL_STATUS       (0x0 + amd756_ioport)
  55 #define SMB_GLOBAL_ENABLE       (0x2 + amd756_ioport)
  56 #define SMB_HOST_ADDRESS        (0x4 + amd756_ioport)
  57 #define SMB_HOST_DATA           (0x6 + amd756_ioport)
  58 #define SMB_HOST_COMMAND        (0x8 + amd756_ioport)
  59 #define SMB_HOST_BLOCK_DATA     (0x9 + amd756_ioport)
  60 #define SMB_HAS_DATA            (0xA + amd756_ioport)
  61 #define SMB_HAS_DEVICE_ADDRESS  (0xC + amd756_ioport)
  62 #define SMB_HAS_HOST_ADDRESS    (0xE + amd756_ioport)
  63 #define SMB_SNOOP_ADDRESS       (0xF + amd756_ioport)
  64
  65 /* PCI Address Constants */
  66
  67 /* address of I/O space */
  68 #define SMBBA           0x058           /* mh */
  69 #define SMBBANFORCE     0x014
  70
  71 /* general configuration */
  72 #define SMBGCFG         0x041           /* mh */
  73
  74 /* silicon revision code */
  75 #define SMBREV          0x008
  76
  77 /* Other settings */
  78 #define MAX_TIMEOUT     500
  79
  80 /* AMD756 constants */
  81 #define AMD756_QUICK            0x00
  82 #define AMD756_BYTE             0x01
  83 #define AMD756_BYTE_DATA        0x02
  84 #define AMD756_WORD_DATA        0x03
  85 #define AMD756_PROCESS_CALL     0x04
  86 #define AMD756_BLOCK_DATA       0x05
  87
  88 static struct pci_driver amd756_driver;
  89 static unsigned short amd756_ioport;
  90
  91 /*
  92   SMBUS event = I/O 28-29 bit 11
  93      see E0 for the status bits and enabled in E2
  94
  95 */
  96 #define GS_ABRT_STS     (1 << 0)
  97 #define GS_COL_STS      (1 << 1)
  98 #define GS_PRERR_STS    (1 << 2)
  99 #define GS_HST_STS      (1 << 3)
 100 #define GS_HCYC_STS     (1 << 4)
 101 #define GS_TO_STS       (1 << 5)
 102 #define GS_SMB_STS      (1 << 11)
 103
 104 #define GS_CLEAR_STS    (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
 105                          GS_HCYC_STS | GS_TO_STS )
 106
 107 #define GE_CYC_TYPE_MASK        (7)
 108 #define GE_HOST_STC             (1 << 3)
 109 #define GE_ABORT                (1 << 5)
 110
 111
 112 static int amd756_transaction(struct i2c_adapter *adap)
 113 {
 114         int temp;
 115         int result = 0;
 116         int timeout = 0;
 117
 118         dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
 119                 "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
 120                 inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
 121                 inb_p(SMB_HOST_DATA));
 122
 123         /* Make sure the SMBus host is ready to start transmitting */
 124         if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
 125                 dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp);
 126                 do {
 127                         msleep(1);
 128                         temp = inw_p(SMB_GLOBAL_STATUS);
 129                 } while ((temp & (GS_HST_STS | GS_SMB_STS)) &&
 130                          (timeout++ < MAX_TIMEOUT));
 131                 /* If the SMBus is still busy, we give up */
 132                 if (timeout >= MAX_TIMEOUT) {
 133                         dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp);
 134                         goto abort;
 135                 }
 136                 timeout = 0;
 137         }
 138
 139         /* start the transaction by setting the start bit */
 140         outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);
 141
 142         /* We will always wait for a fraction of a second! */
 143         do {
 144                 msleep(1);
 145                 temp = inw_p(SMB_GLOBAL_STATUS);
 146         } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT));
 147
 148         /* If the SMBus is still busy, we give up */
 149         if (timeout >= MAX_TIMEOUT) {
 150                 dev_dbg(&adap->dev, "Completion timeout!\n");
 151                 goto abort;
 152         }
 153
 154         if (temp & GS_PRERR_STS) {
 155                 result = -1;
 156                 dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
 157         }
 158
 159         if (temp & GS_COL_STS) {
 160                 result = -1;
 161                 dev_warn(&adap->dev, "SMBus collision!\n");
 162         }
 163
 164         if (temp & GS_TO_STS) {
 165                 result = -1;
 166                 dev_dbg(&adap->dev, "SMBus protocol timeout!\n");
 167         }
 168
 169         if (temp & GS_HCYC_STS)
 170                 dev_dbg(&adap->dev, "SMBus protocol success!\n");
 171
 172         outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
 173
 174 #ifdef DEBUG
 175         if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
 176                 dev_dbg(&adap->dev,
 177                         "Failed reset at end of transaction (%04x)\n", temp);
 178         }
 179 #endif
 180
 181         dev_dbg(&adap->dev,
 182                 "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
 183                 inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),
 184                 inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));
 185
 186         return result;
 187
 188  abort:
 189         dev_warn(&adap->dev, "Sending abort\n");
 190         outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
 191         msleep(100);
 192         outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
 193         return -1;
 194 }
 195
 196 /* Return -1 on error. */
 197 static s32 amd756_access(struct i2c_adapter * adap, u16 addr,
 198                   unsigned short flags, char read_write,
 199                   u8 command, int size, union i2c_smbus_data * data)
 200 {
 201         int i, len;
 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 -1;
 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         if (amd756_transaction(adap))   /* Error in transaction */
 261                 return -1;
 262
 263         if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))
 264                 return 0;
 265
 266
 267         switch (size) {
 268         case AMD756_BYTE:
 269                 data->byte = inw_p(SMB_HOST_DATA);
 270                 break;
 271         case AMD756_BYTE_DATA:
 272                 data->byte = inw_p(SMB_HOST_DATA);
 273                 break;
 274         case AMD756_WORD_DATA:
 275                 data->word = inw_p(SMB_HOST_DATA);      /* TODO: endian???? */
 276                 break;
 277         case AMD756_BLOCK_DATA:
 278                 data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;
 279                 if(data->block[0] > 32)
 280                         data->block[0] = 32;
 281                 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
 282                 for (i = 1; i <= data->block[0]; i++)
 283                         data->block[i] = inb_p(SMB_HOST_BLOCK_DATA);
 284                 break;
 285         }
 286
 287         return 0;
 288 }
 289
 290 static u32 amd756_func(struct i2c_adapter *adapter)
 291 {
 292         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 293             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 294             I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_PROC_CALL;
 295 }
 296
 297 static struct i2c_algorithm smbus_algorithm = {
 298         .smbus_xfer     = amd756_access,
 299         .functionality  = amd756_func,
 300 };
 301
 302 struct i2c_adapter amd756_smbus = {
 303         .owner          = THIS_MODULE,
 304         .class          = I2C_CLASS_HWMON,
 305         .algo           = &smbus_algorithm,
 306 };
 307
 308 enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 };
 309 static const char* chipname[] = {
 310         "AMD756", "AMD766", "AMD768",
 311         "nVidia nForce", "AMD8111",
 312 };
 313
 314 static struct pci_device_id amd756_ids[] = {
 315         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B),
 316           .driver_data = AMD756 },
 317         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413),
 318           .driver_data = AMD766 },
 319         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443),
 320           .driver_data = AMD768 },
 321         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS),
 322           .driver_data = AMD8111 },
 323         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS),
 324           .driver_data = NFORCE },
 325         { 0, }
 326 };
 327
 328 MODULE_DEVICE_TABLE (pci, amd756_ids);
 329
 330 static int __devinit amd756_probe(struct pci_dev *pdev,
 331                                   const struct pci_device_id *id)
 332 {
 333         int nforce = (id->driver_data == NFORCE);
 334         int error;
 335         u8 temp;
 336
 337         if (amd756_ioport) {
 338                 dev_err(&pdev->dev, "Only one device supported "
 339                        "(you have a strange motherboard, btw)\n");
 340                 return -ENODEV;
 341         }
 342
 343         if (nforce) {
 344                 if (PCI_FUNC(pdev->devfn) != 1)
 345                         return -ENODEV;
 346
 347                 pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);
 348                 amd756_ioport &= 0xfffc;
 349         } else { /* amd */
 350                 if (PCI_FUNC(pdev->devfn) != 3)
 351                         return -ENODEV;
 352
 353                 pci_read_config_byte(pdev, SMBGCFG, &temp);
 354                 if ((temp & 128) == 0) {
 355                         dev_err(&pdev->dev,
 356                                 "Error: SMBus controller I/O not enabled!\n");
 357                         return -ENODEV;
 358                 }
 359
 360                 /* Determine the address of the SMBus areas */
 361                 /* Technically it is a dword but... */
 362                 pci_read_config_word(pdev, SMBBA, &amd756_ioport);
 363                 amd756_ioport &= 0xff00;
 364                 amd756_ioport += SMB_ADDR_OFFSET;
 365         }
 366
 367         if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
 368                 dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
 369                         amd756_ioport);
 370                 return -ENODEV;
 371         }
 372
 373         pci_read_config_byte(pdev, SMBREV, &temp);
 374         dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
 375         dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport);
 376
 377         /* set up the driverfs linkage to our parent device */
 378         amd756_smbus.dev.parent = &pdev->dev;
 379
 380         sprintf(amd756_smbus.name, "SMBus %s adapter at %04x",
 381                 chipname[id->driver_data], amd756_ioport);
 382
 383         error = i2c_add_adapter(&amd756_smbus);
 384         if (error) {
 385                 dev_err(&pdev->dev,
 386                         "Adapter registration failed, module not inserted\n");
 387                 goto out_err;
 388         }
 389
 390         return 0;
 391
 392  out_err:
 393         release_region(amd756_ioport, SMB_IOSIZE);
 394         return error;
 395 }
 396
 397 static void __devexit amd756_remove(struct pci_dev *dev)
 398 {
 399         i2c_del_adapter(&amd756_smbus);
 400         release_region(amd756_ioport, SMB_IOSIZE);
 401 }
 402
 403 static struct pci_driver amd756_driver = {
 404         .name           = "amd756_smbus",
 405         .id_table       = amd756_ids,
 406         .probe          = amd756_probe,
 407         .remove         = __devexit_p(amd756_remove),
 408 };
 409
 410 static int __init amd756_init(void)
 411 {
 412         return pci_register_driver(&amd756_driver);
 413 }
 414
 415 static void __exit amd756_exit(void)
 416 {
 417         pci_unregister_driver(&amd756_driver);
 418 }
 419
 420 MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
 421 MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
 422 MODULE_LICENSE("GPL");
 423
 424 EXPORT_SYMBOL(amd756_smbus);
 425
 426 module_init(amd756_init)
 427 module_exit(amd756_exit)