drivers/i2c/busses/i2c-sis5595.c

   1 /*
   2     sis5595.c - Part of lm_sensors, Linux kernel modules for hardware
   3               monitoring
   4     Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> and
   5     Philip Edelbrock <phil@netroedge.com>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 /* Note: we assume there can only be one SIS5595 with one SMBus interface */
  23
  24 /*
  25    Note: all have mfr. ID 0x1039.
  26    SUPPORTED            PCI ID
  27         5595            0008
  28
  29    Note: these chips contain a 0008 device which is incompatible with the
  30          5595. We recognize these by the presence of the listed
  31          "blacklist" PCI ID and refuse to load.
  32
  33    NOT SUPPORTED        PCI ID          BLACKLIST PCI ID
  34          540            0008            0540
  35          550            0008            0550
  36         5513            0008            5511
  37         5581            0008            5597
  38         5582            0008            5597
  39         5597            0008            5597
  40         5598            0008            5597/5598
  41          630            0008            0630
  42          645            0008            0645
  43          646            0008            0646
  44          648            0008            0648
  45          650            0008            0650
  46          651            0008            0651
  47          730            0008            0730
  48          735            0008            0735
  49          745            0008            0745
  50          746            0008            0746
  51 */
  52
  53 /* TO DO:
  54  * Add Block Transfers (ugly, but supported by the adapter)
  55  * Add adapter resets
  56  */
  57
  58 #include <linux/kernel.h>
  59 #include <linux/module.h>
  60 #include <linux/delay.h>
  61 #include <linux/pci.h>
  62 #include <linux/ioport.h>
  63 #include <linux/init.h>
  64 #include <linux/i2c.h>
  65 #include <asm/io.h>
  66
  67 static int blacklist[] = {
  68         PCI_DEVICE_ID_SI_540,
  69         PCI_DEVICE_ID_SI_550,
  70         PCI_DEVICE_ID_SI_630,
  71         PCI_DEVICE_ID_SI_645,
  72         PCI_DEVICE_ID_SI_646,
  73         PCI_DEVICE_ID_SI_648,
  74         PCI_DEVICE_ID_SI_650,
  75         PCI_DEVICE_ID_SI_651,
  76         PCI_DEVICE_ID_SI_730,
  77         PCI_DEVICE_ID_SI_735,
  78         PCI_DEVICE_ID_SI_745,
  79         PCI_DEVICE_ID_SI_746,
  80         PCI_DEVICE_ID_SI_5511,  /* 5513 chip has the 0008 device but that ID
  81                                    shows up in other chips so we use the 5511
  82                                    ID for recognition */
  83         PCI_DEVICE_ID_SI_5597,
  84         PCI_DEVICE_ID_SI_5598,
  85         0,                      /* terminates the list */
  86 };
  87
  88 /* Length of ISA address segment */
  89 #define SIS5595_EXTENT          8
  90 /* SIS5595 SMBus registers */
  91 #define SMB_STS_LO              0x00
  92 #define SMB_STS_HI              0x01
  93 #define SMB_CTL_LO              0x02
  94 #define SMB_CTL_HI              0x03
  95 #define SMB_ADDR                0x04
  96 #define SMB_CMD                 0x05
  97 #define SMB_PCNT                0x06
  98 #define SMB_CNT                 0x07
  99 #define SMB_BYTE                0x08
 100 #define SMB_DEV                 0x10
 101 #define SMB_DB0                 0x11
 102 #define SMB_DB1                 0x12
 103 #define SMB_HAA                 0x13
 104
 105 /* PCI Address Constants */
 106 #define SMB_INDEX               0x38
 107 #define SMB_DAT                 0x39
 108 #define SIS5595_ENABLE_REG      0x40
 109 #define ACPI_BASE               0x90
 110
 111 /* Other settings */
 112 #define MAX_TIMEOUT             500
 113
 114 /* SIS5595 constants */
 115 #define SIS5595_QUICK           0x00
 116 #define SIS5595_BYTE            0x02
 117 #define SIS5595_BYTE_DATA       0x04
 118 #define SIS5595_WORD_DATA       0x06
 119 #define SIS5595_PROC_CALL       0x08
 120 #define SIS5595_BLOCK_DATA      0x0A
 121
 122 /* insmod parameters */
 123
 124 /* If force_addr is set to anything different from 0, we forcibly enable
 125    the device at the given address. */
 126 static u16 force_addr;
 127 module_param(force_addr, ushort, 0);
 128 MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
 129
 130 static struct pci_driver sis5595_driver;
 131 static unsigned short sis5595_base;
 132
 133 static u8 sis5595_read(u8 reg)
 134 {
 135         outb(reg, sis5595_base + SMB_INDEX);
 136         return inb(sis5595_base + SMB_DAT);
 137 }
 138
 139 static void sis5595_write(u8 reg, u8 data)
 140 {
 141         outb(reg, sis5595_base + SMB_INDEX);
 142         outb(data, sis5595_base + SMB_DAT);
 143 }
 144
 145 static int sis5595_setup(struct pci_dev *SIS5595_dev)
 146 {
 147         u16 a;
 148         u8 val;
 149         int *i;
 150         int retval = -ENODEV;
 151
 152         /* Look for imposters */
 153         for (i = blacklist; *i != 0; i++) {
 154                 struct pci_dev *dev;
 155                 dev = pci_get_device(PCI_VENDOR_ID_SI, *i, NULL);
 156                 if (dev) {
 157                         dev_err(&SIS5595_dev->dev, "Looked for SIS5595 but found unsupported device %.4x\n", *i);
 158                         pci_dev_put(dev);
 159                         return -ENODEV;
 160                 }
 161         }
 162
 163         /* Determine the address of the SMBus areas */
 164         pci_read_config_word(SIS5595_dev, ACPI_BASE, &sis5595_base);
 165         if (sis5595_base == 0 && force_addr == 0) {
 166                 dev_err(&SIS5595_dev->dev, "ACPI base address uninitialized - upgrade BIOS or use force_addr=0xaddr\n");
 167                 return -ENODEV;
 168         }
 169
 170         if (force_addr)
 171                 sis5595_base = force_addr & ~(SIS5595_EXTENT - 1);
 172         dev_dbg(&SIS5595_dev->dev, "ACPI Base address: %04x\n", sis5595_base);
 173
 174         /* NB: We grab just the two SMBus registers here, but this may still
 175          * interfere with ACPI :-(  */
 176         if (!request_region(sis5595_base + SMB_INDEX, 2,
 177                             sis5595_driver.name)) {
 178                 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
 179                         sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1);
 180                 return -ENODEV;
 181         }
 182
 183         if (force_addr) {
 184                 dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
 185                 if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
 186                     != PCIBIOS_SUCCESSFUL)
 187                         goto error;
 188                 if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
 189                     != PCIBIOS_SUCCESSFUL)
 190                         goto error;
 191                 if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
 192                         /* doesn't work for some chips! */
 193                         dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n");
 194                         goto error;
 195                 }
 196         }
 197
 198         if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
 199             != PCIBIOS_SUCCESSFUL)
 200                 goto error;
 201         if ((val & 0x80) == 0) {
 202                 dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
 203                 if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
 204                     != PCIBIOS_SUCCESSFUL)
 205                         goto error;
 206                 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
 207                     != PCIBIOS_SUCCESSFUL)
 208                         goto error;
 209                 if ((val & 0x80) == 0) {
 210                         /* doesn't work for some chips? */
 211                         dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n");
 212                         goto error;
 213                 }
 214         }
 215
 216         /* Everything is happy */
 217         return 0;
 218
 219 error:
 220         release_region(sis5595_base + SMB_INDEX, 2);
 221         return retval;
 222 }
 223
 224 static int sis5595_transaction(struct i2c_adapter *adap)
 225 {
 226         int temp;
 227         int result = 0;
 228         int timeout = 0;
 229
 230         /* Make sure the SMBus host is ready to start transmitting */
 231         temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
 232         if (temp != 0x00) {
 233                 dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting...\n", temp);
 234                 sis5595_write(SMB_STS_LO, temp & 0xff);
 235                 sis5595_write(SMB_STS_HI, temp >> 8);
 236                 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
 237                         dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
 238                         return -1;
 239                 } else {
 240                         dev_dbg(&adap->dev, "Successfull!\n");
 241                 }
 242         }
 243
 244         /* start the transaction by setting bit 4 */
 245         sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10);
 246
 247         /* We will always wait for a fraction of a second! */
 248         do {
 249                 msleep(1);
 250                 temp = sis5595_read(SMB_STS_LO);
 251         } while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT));
 252
 253         /* If the SMBus is still busy, we give up */
 254         if (timeout >= MAX_TIMEOUT) {
 255                 dev_dbg(&adap->dev, "SMBus Timeout!\n");
 256                 result = -1;
 257         }
 258
 259         if (temp & 0x10) {
 260                 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
 261                 result = -1;
 262         }
 263
 264         if (temp & 0x20) {
 265                 dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
 266                         "next hard reset (or not...)\n");
 267                 /* Clock stops and slave is stuck in mid-transmission */
 268                 result = -1;
 269         }
 270
 271         temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
 272         if (temp != 0x00) {
 273                 sis5595_write(SMB_STS_LO, temp & 0xff);
 274                 sis5595_write(SMB_STS_HI, temp >> 8);
 275         }
 276
 277         temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
 278         if (temp != 0x00)
 279                 dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp);
 280
 281         return result;
 282 }
 283
 284 /* Return -1 on error. */
 285 static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
 286                           unsigned short flags, char read_write,
 287                           u8 command, int size, union i2c_smbus_data *data)
 288 {
 289         switch (size) {
 290         case I2C_SMBUS_QUICK:
 291                 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
 292                 size = SIS5595_QUICK;
 293                 break;
 294         case I2C_SMBUS_BYTE:
 295                 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
 296                 if (read_write == I2C_SMBUS_WRITE)
 297                         sis5595_write(SMB_CMD, command);
 298                 size = SIS5595_BYTE;
 299                 break;
 300         case I2C_SMBUS_BYTE_DATA:
 301                 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
 302                 sis5595_write(SMB_CMD, command);
 303                 if (read_write == I2C_SMBUS_WRITE)
 304                         sis5595_write(SMB_BYTE, data->byte);
 305                 size = SIS5595_BYTE_DATA;
 306                 break;
 307         case I2C_SMBUS_PROC_CALL:
 308         case I2C_SMBUS_WORD_DATA:
 309                 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
 310                 sis5595_write(SMB_CMD, command);
 311                 if (read_write == I2C_SMBUS_WRITE) {
 312                         sis5595_write(SMB_BYTE, data->word & 0xff);
 313                         sis5595_write(SMB_BYTE + 1,
 314                                       (data->word & 0xff00) >> 8);
 315                 }
 316                 size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA;
 317                 break;
 318 /*
 319         case I2C_SMBUS_BLOCK_DATA:
 320                 printk(KERN_WARNING "sis5595.o: Block data not yet implemented!\n");
 321                 return -1;
 322                 break;
 323 */
 324         default:
 325                 printk(KERN_WARNING "sis5595.o: Unsupported transaction %d\n", size);
 326                 return -1;
 327         }
 328
 329         sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
 330
 331         if (sis5595_transaction(adap))
 332                 return -1;
 333
 334         if ((size != SIS5595_PROC_CALL) &&
 335             ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
 336                 return 0;
 337
 338
 339         switch (size) {
 340         case SIS5595_BYTE:      /* Where is the result put? I assume here it is in
 341                                    SMB_DATA but it might just as well be in the
 342                                    SMB_CMD. No clue in the docs */
 343         case SIS5595_BYTE_DATA:
 344                 data->byte = sis5595_read(SMB_BYTE);
 345                 break;
 346         case SIS5595_WORD_DATA:
 347         case SIS5595_PROC_CALL:
 348                 data->word = sis5595_read(SMB_BYTE) + (sis5595_read(SMB_BYTE + 1) << 8);
 349                 break;
 350         }
 351         return 0;
 352 }
 353
 354 static u32 sis5595_func(struct i2c_adapter *adapter)
 355 {
 356         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 357             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 358             I2C_FUNC_SMBUS_PROC_CALL;
 359 }
 360
 361 static const struct i2c_algorithm smbus_algorithm = {
 362         .smbus_xfer     = sis5595_access,
 363         .functionality  = sis5595_func,
 364 };
 365
 366 static struct i2c_adapter sis5595_adapter = {
 367         .owner          = THIS_MODULE,
 368         .class          = I2C_CLASS_HWMON,
 369         .algo           = &smbus_algorithm,
 370 };
 371
 372 static struct pci_device_id sis5595_ids[] __devinitdata = {
 373         { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
 374         { 0, }
 375 };
 376
 377 MODULE_DEVICE_TABLE (pci, sis5595_ids);
 378
 379 static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id)
 380 {
 381         if (sis5595_setup(dev)) {
 382                 dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n");
 383                 return -ENODEV;
 384         }
 385
 386         /* set up the driverfs linkage to our parent device */
 387         sis5595_adapter.dev.parent = &dev->dev;
 388
 389         sprintf(sis5595_adapter.name, "SMBus SIS5595 adapter at %04x",
 390                 sis5595_base + SMB_INDEX);
 391         return i2c_add_adapter(&sis5595_adapter);
 392 }
 393
 394 static void __devexit sis5595_remove(struct pci_dev *dev)
 395 {
 396         i2c_del_adapter(&sis5595_adapter);
 397         release_region(sis5595_base + SMB_INDEX, 2);
 398 }
 399
 400 static struct pci_driver sis5595_driver = {
 401         .name           = "sis5595_smbus",
 402         .id_table       = sis5595_ids,
 403         .probe          = sis5595_probe,
 404         .remove         = __devexit_p(sis5595_remove),
 405 };
 406
 407 static int __init i2c_sis5595_init(void)
 408 {
 409         return pci_register_driver(&sis5595_driver);
 410 }
 411
 412 static void __exit i2c_sis5595_exit(void)
 413 {
 414         pci_unregister_driver(&sis5595_driver);
 415 }
 416
 417 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
 418 MODULE_DESCRIPTION("SIS5595 SMBus driver");
 419 MODULE_LICENSE("GPL");
 420
 421 module_init(i2c_sis5595_init);
 422 module_exit(i2c_sis5595_exit);