drivers/i2c/busses/i2c-amd756.c

   1 /*
   2     Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
   3
   4     Shamelessly ripped from i2c-piix4.c:
   5
   6     Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> and
   7     Philip Edelbrock <phil@netroedge.com>
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17     GNU General Public License for more details.
  18
  19     You should have received a copy of the GNU General Public License
  20     along with this program; if not, write to the Free Software
  21     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 /*
  25     2002-04-08: Added nForce support. (Csaba Halasz)
  26     2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)
  27     2002-12-28: Rewritten into something that resembles a Linux driver (hch)
  28     2003-11-29: Added back AMD8111 removed by the previous rewrite.
  29                 (Philip Pokorny)
  30 */
  31
  32 /*
  33    Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce
  34    Note: we assume there can only be one device, with one SMBus interface.
  35 */
  36
  37 #include <linux/module.h>
  38 #include <linux/pci.h>
  39 #include <linux/kernel.h>
  40 #include <linux/delay.h>
  41 #include <linux/stddef.h>
  42 #include <linux/ioport.h>
  43 #include <linux/i2c.h>
  44 #include <linux/init.h>
  45 #include <linux/acpi.h>
  46 #include <asm/io.h>
  47
  48 /* AMD756 SMBus address offsets */
  49 #define SMB_ADDR_OFFSET         0xE0
  50 #define SMB_IOSIZE              16
  51 #define SMB_GLOBAL_STATUS       (0x0 + amd756_ioport)
  52 #define SMB_GLOBAL_ENABLE       (0x2 + amd756_ioport)
  53 #define SMB_HOST_ADDRESS        (0x4 + amd756_ioport)
  54 #define SMB_HOST_DATA           (0x6 + amd756_ioport)
  55 #define SMB_HOST_COMMAND        (0x8 + amd756_ioport)
  56 #define SMB_HOST_BLOCK_DATA     (0x9 + amd756_ioport)
  57 #define SMB_HAS_DATA            (0xA + amd756_ioport)
  58 #define SMB_HAS_DEVICE_ADDRESS  (0xC + amd756_ioport)
  59 #define SMB_HAS_HOST_ADDRESS    (0xE + amd756_ioport)
  60 #define SMB_SNOOP_ADDRESS       (0xF + amd756_ioport)
  61
  62 /* PCI Address Constants */
  63
  64 /* address of I/O space */
  65 #define SMBBA           0x058           /* mh */
  66 #define SMBBANFORCE     0x014
  67
  68 /* general configuration */
  69 #define SMBGCFG         0x041           /* mh */
  70
  71 /* silicon revision code */
  72 #define SMBREV          0x008
  73
  74 /* Other settings */
  75 #define MAX_TIMEOUT     500
  76
  77 /* AMD756 constants */
  78 #define AMD756_QUICK            0x00
  79 #define AMD756_BYTE             0x01
  80 #define AMD756_BYTE_DATA        0x02
  81 #define AMD756_WORD_DATA        0x03
  82 #define AMD756_PROCESS_CALL     0x04
  83 #define AMD756_BLOCK_DATA       0x05
  84
  85 static struct pci_driver amd756_driver;
  86 static unsigned short amd756_ioport;
  87
  88 /*
  89   SMBUS event = I/O 28-29 bit 11
  90      see E0 for the status bits and enabled in E2
  91
  92 */
  93 #define GS_ABRT_STS     (1 << 0)
  94 #define GS_COL_STS      (1 << 1)
  95 #define GS_PRERR_STS    (1 << 2)
  96 #define GS_HST_STS      (1 << 3)
  97 #define GS_HCYC_STS     (1 << 4)
  98 #define GS_TO_STS       (1 << 5)
  99 #define GS_SMB_STS      (1 << 11)
 100
 101 #define GS_CLEAR_STS    (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
 102                          GS_HCYC_STS | GS_TO_STS )
 103
 104 #define GE_CYC_TYPE_MASK        (7)
 105 #define GE_HOST_STC             (1 << 3)
 106 #define GE_ABORT                (1 << 5)
 107
 108
 109 static int amd756_transaction(struct i2c_adapter *adap)
 110 {
 111         int temp;
 112         int result = 0;
 113         int timeout = 0;
 114
 115         dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
 116                 "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
 117                 inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
 118                 inb_p(SMB_HOST_DATA));
 119
 120         /* Make sure the SMBus host is ready to start transmitting */
 121         if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
 122                 dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp);
 123                 do {
 124                         msleep(1);
 125                         temp = inw_p(SMB_GLOBAL_STATUS);
 126                 } while ((temp & (GS_HST_STS | GS_SMB_STS)) &&
 127                          (timeout++ < MAX_TIMEOUT));
 128                 /* If the SMBus is still busy, we give up */
 129                 if (timeout > MAX_TIMEOUT) {
 130                         dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp);
 131                         goto abort;
 132                 }
 133                 timeout = 0;
 134         }
 135
 136         /* start the transaction by setting the start bit */
 137         outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);
 138
 139         /* We will always wait for a fraction of a second! */
 140         do {
 141                 msleep(1);
 142                 temp = inw_p(SMB_GLOBAL_STATUS);
 143         } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT));
 144
 145         /* If the SMBus is still busy, we give up */
 146         if (timeout > MAX_TIMEOUT) {
 147                 dev_dbg(&adap->dev, "Completion timeout!\n");
 148                 goto abort;
 149         }
 150
 151         if (temp & GS_PRERR_STS) {
 152                 result = -ENXIO;
 153                 dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
 154         }
 155
 156         if (temp & GS_COL_STS) {
 157                 result = -EIO;
 158                 dev_warn(&adap->dev, "SMBus collision!\n");
 159         }
 160
 161         if (temp & GS_TO_STS) {
 162                 result = -ETIMEDOUT;
 163                 dev_dbg(&adap->dev, "SMBus protocol timeout!\n");
 164         }
 165
 166         if (temp & GS_HCYC_STS)
 167                 dev_dbg(&adap->dev, "SMBus protocol success!\n");
 168
 169         outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
 170
 171 #ifdef DEBUG
 172         if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
 173                 dev_dbg(&adap->dev,
 174                         "Failed reset at end of transaction (%04x)\n", temp);
 175         }
 176 #endif
 177
 178         dev_dbg(&adap->dev,
 179                 "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
 180                 inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),
 181                 inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));
 182
 183         return result;
 184
 185  abort:
 186         dev_warn(&adap->dev, "Sending abort\n");
 187         outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
 188         msleep(100);
 189         outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
 190         return -EIO;
 191 }
 192
 193 /* Return negative errno on error. */
 194 static s32 amd756_access(struct i2c_adapter * adap, u16 addr,
 195                   unsigned short flags, char read_write,
 196                   u8 command, int size, union i2c_smbus_data * data)
 197 {
 198         int i, len;
 199         int status;
 200
 201         switch (size) {
 202         case I2C_SMBUS_QUICK:
 203                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 204                        SMB_HOST_ADDRESS);
 205                 size = AMD756_QUICK;
 206                 break;
 207         case I2C_SMBUS_BYTE:
 208                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 209                        SMB_HOST_ADDRESS);
 210                 if (read_write == I2C_SMBUS_WRITE)
 211                         outb_p(command, SMB_HOST_DATA);
 212                 size = AMD756_BYTE;
 213                 break;
 214         case I2C_SMBUS_BYTE_DATA:
 215                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 216                        SMB_HOST_ADDRESS);
 217                 outb_p(command, SMB_HOST_COMMAND);
 218                 if (read_write == I2C_SMBUS_WRITE)
 219                         outw_p(data->byte, SMB_HOST_DATA);
 220                 size = AMD756_BYTE_DATA;
 221                 break;
 222         case I2C_SMBUS_WORD_DATA:
 223                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 224                        SMB_HOST_ADDRESS);
 225                 outb_p(command, SMB_HOST_COMMAND);
 226                 if (read_write == I2C_SMBUS_WRITE)
 227                         outw_p(data->word, SMB_HOST_DATA);      /* TODO: endian???? */
 228                 size = AMD756_WORD_DATA;
 229                 break;
 230         case I2C_SMBUS_BLOCK_DATA:
 231                 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 232                        SMB_HOST_ADDRESS);
 233                 outb_p(command, SMB_HOST_COMMAND);
 234                 if (read_write == I2C_SMBUS_WRITE) {
 235                         len = data->block[0];
 236                         if (len < 0)
 237                                 len = 0;
 238                         if (len > 32)
 239                                 len = 32;
 240                         outw_p(len, SMB_HOST_DATA);
 241                         /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
 242                         for (i = 1; i <= len; i++)
 243                                 outb_p(data->block[i],
 244                                        SMB_HOST_BLOCK_DATA);
 245                 }
 246                 size = AMD756_BLOCK_DATA;
 247                 break;
 248         default:
 249                 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
 250                 return -EOPNOTSUPP;
 251         }
 252
 253         /* How about enabling interrupts... */
 254         outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);
 255
 256         status = amd756_transaction(adap);
 257         if (status)
 258                 return status;
 259
 260         if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))
 261                 return 0;
 262
 263
 264         switch (size) {
 265         case AMD756_BYTE:
 266                 data->byte = inw_p(SMB_HOST_DATA);
 267                 break;
 268         case AMD756_BYTE_DATA:
 269                 data->byte = inw_p(SMB_HOST_DATA);
 270                 break;
 271         case AMD756_WORD_DATA:
 272                 data->word = inw_p(SMB_HOST_DATA);      /* TODO: endian???? */
 273                 break;
 274         case AMD756_BLOCK_DATA:
 275                 data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;
 276                 if(data->block[0] > 32)
 277                         data->block[0] = 32;
 278                 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
 279                 for (i = 1; i <= data->block[0]; i++)
 280                         data->block[i] = inb_p(SMB_HOST_BLOCK_DATA);
 281                 break;
 282         }
 283
 284         return 0;
 285 }
 286
 287 static u32 amd756_func(struct i2c_adapter *adapter)
 288 {
 289         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 290             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 291             I2C_FUNC_SMBUS_BLOCK_DATA;
 292 }
 293
 294 static const struct i2c_algorithm smbus_algorithm = {
 295         .smbus_xfer     = amd756_access,
 296         .functionality  = amd756_func,
 297 };
 298
 299 struct i2c_adapter amd756_smbus = {
 300         .owner          = THIS_MODULE,
 301         .class          = I2C_CLASS_HWMON | I2C_CLASS_SPD,
 302         .algo           = &smbus_algorithm,
 303 };
 304
 305 enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 };
 306 static const char* chipname[] = {
 307         "AMD756", "AMD766", "AMD768",
 308         "nVidia nForce", "AMD8111",
 309 };
 310
 311 static const struct pci_device_id amd756_ids[] = {
 312         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B),
 313           .driver_data = AMD756 },
 314         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413),
 315           .driver_data = AMD766 },
 316         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443),
 317           .driver_data = AMD768 },
 318         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS),
 319           .driver_data = AMD8111 },
 320         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS),
 321           .driver_data = NFORCE },
 322         { 0, }
 323 };
 324
 325 MODULE_DEVICE_TABLE (pci, amd756_ids);
 326
 327 static int __devinit amd756_probe(struct pci_dev *pdev,
 328                                   const struct pci_device_id *id)
 329 {
 330         int nforce = (id->driver_data == NFORCE);
 331         int error;
 332         u8 temp;
 333
 334         if (amd756_ioport) {
 335                 dev_err(&pdev->dev, "Only one device supported "
 336                        "(you have a strange motherboard, btw)\n");
 337                 return -ENODEV;
 338         }
 339
 340         if (nforce) {
 341                 if (PCI_FUNC(pdev->devfn) != 1)
 342                         return -ENODEV;
 343
 344                 pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);
 345                 amd756_ioport &= 0xfffc;
 346         } else { /* amd */
 347                 if (PCI_FUNC(pdev->devfn) != 3)
 348                         return -ENODEV;
 349
 350                 pci_read_config_byte(pdev, SMBGCFG, &temp);
 351                 if ((temp & 128) == 0) {
 352                         dev_err(&pdev->dev,
 353                                 "Error: SMBus controller I/O not enabled!\n");
 354                         return -ENODEV;
 355                 }
 356
 357                 /* Determine the address of the SMBus areas */
 358                 /* Technically it is a dword but... */
 359                 pci_read_config_word(pdev, SMBBA, &amd756_ioport);
 360                 amd756_ioport &= 0xff00;
 361                 amd756_ioport += SMB_ADDR_OFFSET;
 362         }
 363
 364         error = acpi_check_region(amd756_ioport, SMB_IOSIZE,
 365                                   amd756_driver.name);
 366         if (error)
 367                 return -ENODEV;
 368
 369         if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
 370                 dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
 371                         amd756_ioport);
 372                 return -ENODEV;
 373         }
 374
 375         pci_read_config_byte(pdev, SMBREV, &temp);
 376         dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
 377         dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport);
 378
 379         /* set up the sysfs linkage to our parent device */
 380         amd756_smbus.dev.parent = &pdev->dev;
 381
 382         snprintf(amd756_smbus.name, sizeof(amd756_smbus.name),
 383                  "SMBus %s adapter at %04x", chipname[id->driver_data],
 384                  amd756_ioport);
 385
 386         error = i2c_add_adapter(&amd756_smbus);
 387         if (error) {
 388                 dev_err(&pdev->dev,
 389                         "Adapter registration failed, module not inserted\n");
 390                 goto out_err;
 391         }
 392
 393         return 0;
 394
 395  out_err:
 396         release_region(amd756_ioport, SMB_IOSIZE);
 397         return error;
 398 }
 399
 400 static void __devexit amd756_remove(struct pci_dev *dev)
 401 {
 402         i2c_del_adapter(&amd756_smbus);
 403         release_region(amd756_ioport, SMB_IOSIZE);
 404 }
 405
 406 static struct pci_driver amd756_driver = {
 407         .name           = "amd756_smbus",
 408         .id_table       = amd756_ids,
 409         .probe          = amd756_probe,
 410         .remove         = __devexit_p(amd756_remove),
 411 };
 412
 413 static int __init amd756_init(void)
 414 {
 415         return pci_register_driver(&amd756_driver);
 416 }
 417
 418 static void __exit amd756_exit(void)
 419 {
 420         pci_unregister_driver(&amd756_driver);
 421 }
 422
 423 MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
 424 MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
 425 MODULE_LICENSE("GPL");
 426
 427 EXPORT_SYMBOL(amd756_smbus);
 428
 429 module_init(amd756_init)
 430 module_exit(amd756_exit)