drivers/i2c/busses/i2c-nforce2.c

   1 /*
   2     SMBus driver for nVidia nForce2 MCP
   3
   4     Added nForce3 Pro 150  Thomas Leibold <thomas@plx.com>,
   5         Ported to 2.5 Patrick Dreker <patrick@dreker.de>,
   6     Copyright (c) 2003  Hans-Frieder Vogt <hfvogt@arcor.de>,
   7     Based on
   8     SMBus 2.0 driver for AMD-8111 IO-Hub
   9     Copyright (c) 2002 Vojtech Pavlik
  10
  11     This program is free software; you can redistribute it and/or modify
  12     it under the terms of the GNU General Public License as published by
  13     the Free Software Foundation; either version 2 of the License, or
  14     (at your option) any later version.
  15
  16     This program is distributed in the hope that it will be useful,
  17     but WITHOUT ANY WARRANTY; without even the implied warranty of
  18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19     GNU General Public License for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with this program; if not, write to the Free Software
  23     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 /*
  27     SUPPORTED DEVICES           PCI ID
  28     nForce2 MCP                 0064
  29     nForce2 Ultra 400 MCP       0084
  30     nForce3 Pro150 MCP          00D4
  31     nForce3 250Gb MCP           00E4
  32     nForce4 MCP                 0052
  33     nForce4 MCP-04              0034
  34     nForce4 MCP51               0264
  35     nForce4 MCP55               0368
  36     nForce MCP61                03EB
  37     nForce MCP65                0446
  38
  39     This driver supports the 2 SMBuses that are included in the MCP of the
  40     nForce2/3/4/5xx chipsets.
  41 */
  42
  43 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
  44
  45 #include <linux/module.h>
  46 #include <linux/pci.h>
  47 #include <linux/kernel.h>
  48 #include <linux/stddef.h>
  49 #include <linux/ioport.h>
  50 #include <linux/init.h>
  51 #include <linux/i2c.h>
  52 #include <linux/delay.h>
  53 #include <linux/dmi.h>
  54 #include <asm/io.h>
  55
  56 MODULE_LICENSE("GPL");
  57 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>");
  58 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
  59
  60
  61 struct nforce2_smbus {
  62         struct i2c_adapter adapter;
  63         int base;
  64         int size;
  65         int blockops;
  66         int can_abort;
  67 };
  68
  69
  70 /*
  71  * nVidia nForce2 SMBus control register definitions
  72  * (Newer incarnations use standard BARs 4 and 5 instead)
  73  */
  74 #define NFORCE_PCI_SMB1 0x50
  75 #define NFORCE_PCI_SMB2 0x54
  76
  77
  78 /*
  79  * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
  80  */
  81 #define NVIDIA_SMB_PRTCL        (smbus->base + 0x00)    /* protocol, PEC */
  82 #define NVIDIA_SMB_STS          (smbus->base + 0x01)    /* status */
  83 #define NVIDIA_SMB_ADDR         (smbus->base + 0x02)    /* address */
  84 #define NVIDIA_SMB_CMD          (smbus->base + 0x03)    /* command */
  85 #define NVIDIA_SMB_DATA         (smbus->base + 0x04)    /* 32 data registers */
  86 #define NVIDIA_SMB_BCNT         (smbus->base + 0x24)    /* number of data
  87                                                            bytes */
  88 #define NVIDIA_SMB_STATUS_ABRT  (smbus->base + 0x3c)    /* register used to
  89                                                            check the status of
  90                                                            the abort command */
  91 #define NVIDIA_SMB_CTRL         (smbus->base + 0x3e)    /* control register */
  92
  93 #define NVIDIA_SMB_STATUS_ABRT_STS      0x01            /* Bit to notify that
  94                                                            abort succeeded */
  95 #define NVIDIA_SMB_CTRL_ABORT   0x20
  96 #define NVIDIA_SMB_STS_DONE     0x80
  97 #define NVIDIA_SMB_STS_ALRM     0x40
  98 #define NVIDIA_SMB_STS_RES      0x20
  99 #define NVIDIA_SMB_STS_STATUS   0x1f
 100
 101 #define NVIDIA_SMB_PRTCL_WRITE                  0x00
 102 #define NVIDIA_SMB_PRTCL_READ                   0x01
 103 #define NVIDIA_SMB_PRTCL_QUICK                  0x02
 104 #define NVIDIA_SMB_PRTCL_BYTE                   0x04
 105 #define NVIDIA_SMB_PRTCL_BYTE_DATA              0x06
 106 #define NVIDIA_SMB_PRTCL_WORD_DATA              0x08
 107 #define NVIDIA_SMB_PRTCL_BLOCK_DATA             0x0a
 108 #define NVIDIA_SMB_PRTCL_PEC                    0x80
 109
 110 /* Misc definitions */
 111 #define MAX_TIMEOUT     100
 112
 113 /* We disable the second SMBus channel on these boards */
 114 static struct dmi_system_id __devinitdata nforce2_dmi_blacklist2[] = {
 115         {
 116                 .ident = "DFI Lanparty NF4 Expert",
 117                 .matches = {
 118                         DMI_MATCH(DMI_BOARD_VENDOR, "DFI Corp,LTD"),
 119                         DMI_MATCH(DMI_BOARD_NAME, "LP UT NF4 Expert"),
 120                 },
 121         },
 122         { }
 123 };
 124
 125 static struct pci_driver nforce2_driver;
 126
 127 /* For multiplexing support, we need a global reference to the 1st
 128    SMBus channel */
 129 #if defined CONFIG_I2C_NFORCE2_S4985 || defined CONFIG_I2C_NFORCE2_S4985_MODULE
 130 struct i2c_adapter *nforce2_smbus;
 131 EXPORT_SYMBOL_GPL(nforce2_smbus);
 132
 133 static void nforce2_set_reference(struct i2c_adapter *adap)
 134 {
 135         nforce2_smbus = adap;
 136 }
 137 #else
 138 static inline void nforce2_set_reference(struct i2c_adapter *adap) { }
 139 #endif
 140
 141 static void nforce2_abort(struct i2c_adapter *adap)
 142 {
 143         struct nforce2_smbus *smbus = adap->algo_data;
 144         int timeout = 0;
 145         unsigned char temp;
 146
 147         dev_dbg(&adap->dev, "Aborting current transaction\n");
 148
 149         outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL);
 150         do {
 151                 msleep(1);
 152                 temp = inb_p(NVIDIA_SMB_STATUS_ABRT);
 153         } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) &&
 154                         (timeout++ < MAX_TIMEOUT));
 155         if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS))
 156                 dev_err(&adap->dev, "Can't reset the smbus\n");
 157         outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT);
 158 }
 159
 160 static int nforce2_check_status(struct i2c_adapter *adap)
 161 {
 162         struct nforce2_smbus *smbus = adap->algo_data;
 163         int timeout = 0;
 164         unsigned char temp;
 165
 166         do {
 167                 msleep(1);
 168                 temp = inb_p(NVIDIA_SMB_STS);
 169         } while ((!temp) && (timeout++ < MAX_TIMEOUT));
 170
 171         if (timeout >= MAX_TIMEOUT) {
 172                 dev_dbg(&adap->dev, "SMBus Timeout!\n");
 173                 if (smbus->can_abort)
 174                         nforce2_abort(adap);
 175                 return -ETIMEDOUT;
 176         }
 177         if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
 178                 dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp);
 179                 return -EIO;
 180         }
 181         return 0;
 182 }
 183
 184 /* Return negative errno on error */
 185 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
 186                 unsigned short flags, char read_write,
 187                 u8 command, int size, union i2c_smbus_data * data)
 188 {
 189         struct nforce2_smbus *smbus = adap->algo_data;
 190         unsigned char protocol, pec;
 191         u8 len;
 192         int i, status;
 193
 194         protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
 195                 NVIDIA_SMB_PRTCL_WRITE;
 196         pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
 197
 198         switch (size) {
 199
 200                 case I2C_SMBUS_QUICK:
 201                         protocol |= NVIDIA_SMB_PRTCL_QUICK;
 202                         read_write = I2C_SMBUS_WRITE;
 203                         break;
 204
 205                 case I2C_SMBUS_BYTE:
 206                         if (read_write == I2C_SMBUS_WRITE)
 207                                 outb_p(command, NVIDIA_SMB_CMD);
 208                         protocol |= NVIDIA_SMB_PRTCL_BYTE;
 209                         break;
 210
 211                 case I2C_SMBUS_BYTE_DATA:
 212                         outb_p(command, NVIDIA_SMB_CMD);
 213                         if (read_write == I2C_SMBUS_WRITE)
 214                                 outb_p(data->byte, NVIDIA_SMB_DATA);
 215                         protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
 216                         break;
 217
 218                 case I2C_SMBUS_WORD_DATA:
 219                         outb_p(command, NVIDIA_SMB_CMD);
 220                         if (read_write == I2C_SMBUS_WRITE) {
 221                                  outb_p(data->word, NVIDIA_SMB_DATA);
 222                                  outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
 223                         }
 224                         protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
 225                         break;
 226
 227                 case I2C_SMBUS_BLOCK_DATA:
 228                         outb_p(command, NVIDIA_SMB_CMD);
 229                         if (read_write == I2C_SMBUS_WRITE) {
 230                                 len = data->block[0];
 231                                 if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
 232                                         dev_err(&adap->dev,
 233                                                 "Transaction failed "
 234                                                 "(requested block size: %d)\n",
 235                                                 len);
 236                                         return -EINVAL;
 237                                 }
 238                                 outb_p(len, NVIDIA_SMB_BCNT);
 239                                 for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
 240                                         outb_p(data->block[i + 1],
 241                                                NVIDIA_SMB_DATA+i);
 242                         }
 243                         protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
 244                         break;
 245
 246                 default:
 247                         dev_err(&adap->dev, "Unsupported transaction %d\n", size);
 248                         return -EOPNOTSUPP;
 249         }
 250
 251         outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
 252         outb_p(protocol, NVIDIA_SMB_PRTCL);
 253
 254         status = nforce2_check_status(adap);
 255         if (status)
 256                 return status;
 257
 258         if (read_write == I2C_SMBUS_WRITE)
 259                 return 0;
 260
 261         switch (size) {
 262
 263                 case I2C_SMBUS_BYTE:
 264                 case I2C_SMBUS_BYTE_DATA:
 265                         data->byte = inb_p(NVIDIA_SMB_DATA);
 266                         break;
 267
 268                 case I2C_SMBUS_WORD_DATA:
 269                         data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
 270                         break;
 271
 272                 case I2C_SMBUS_BLOCK_DATA:
 273                         len = inb_p(NVIDIA_SMB_BCNT);
 274                         if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
 275                                 dev_err(&adap->dev, "Transaction failed "
 276                                         "(received block size: 0x%02x)\n",
 277                                         len);
 278                                 return -EPROTO;
 279                         }
 280                         for (i = 0; i < len; i++)
 281                                 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
 282                         data->block[0] = len;
 283                         break;
 284         }
 285
 286         return 0;
 287 }
 288
 289
 290 static u32 nforce2_func(struct i2c_adapter *adapter)
 291 {
 292         /* other functionality might be possible, but is not tested */
 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_PEC |
 296                (((struct nforce2_smbus*)adapter->algo_data)->blockops ?
 297                 I2C_FUNC_SMBUS_BLOCK_DATA : 0);
 298 }
 299
 300 static struct i2c_algorithm smbus_algorithm = {
 301         .smbus_xfer     = nforce2_access,
 302         .functionality  = nforce2_func,
 303 };
 304
 305
 306 static struct pci_device_id nforce2_ids[] = {
 307         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
 308         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
 309         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
 310         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
 311         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
 312         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
 313         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
 314         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
 315         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
 316         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
 317         { 0 }
 318 };
 319
 320 MODULE_DEVICE_TABLE (pci, nforce2_ids);
 321
 322
 323 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar,
 324         int alt_reg, struct nforce2_smbus *smbus, const char *name)
 325 {
 326         int error;
 327
 328         smbus->base = pci_resource_start(dev, bar);
 329         if (smbus->base) {
 330                 smbus->size = pci_resource_len(dev, bar);
 331         } else {
 332                 /* Older incarnations of the device used non-standard BARs */
 333                 u16 iobase;
 334
 335                 if (pci_read_config_word(dev, alt_reg, &iobase)
 336                     != PCIBIOS_SUCCESSFUL) {
 337                         dev_err(&dev->dev, "Error reading PCI config for %s\n",
 338                                 name);
 339                         return -EIO;
 340                 }
 341
 342                 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
 343                 smbus->size = 64;
 344         }
 345
 346         if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
 347                 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
 348                         smbus->base, smbus->base+smbus->size-1, name);
 349                 return -EBUSY;
 350         }
 351         smbus->adapter.owner = THIS_MODULE;
 352         smbus->adapter.id = I2C_HW_SMBUS_NFORCE2;
 353         smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
 354         smbus->adapter.algo = &smbus_algorithm;
 355         smbus->adapter.algo_data = smbus;
 356         smbus->adapter.dev.parent = &dev->dev;
 357         snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
 358                 "SMBus nForce2 adapter at %04x", smbus->base);
 359
 360         error = i2c_add_adapter(&smbus->adapter);
 361         if (error) {
 362                 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
 363                 release_region(smbus->base, smbus->size);
 364                 return error;
 365         }
 366         dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
 367         return 0;
 368 }
 369
 370
 371 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
 372 {
 373         struct nforce2_smbus *smbuses;
 374         int res1, res2;
 375
 376         /* we support 2 SMBus adapters */
 377         if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
 378                 return -ENOMEM;
 379         pci_set_drvdata(dev, smbuses);
 380
 381         switch(dev->device) {
 382         case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS:
 383         case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS:
 384         case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS:
 385                 smbuses[0].blockops = 1;
 386                 smbuses[1].blockops = 1;
 387                 smbuses[0].can_abort = 1;
 388                 smbuses[1].can_abort = 1;
 389         }
 390
 391         /* SMBus adapter 1 */
 392         res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
 393         if (res1 < 0) {
 394                 dev_err(&dev->dev, "Error probing SMB1.\n");
 395                 smbuses[0].base = 0;    /* to have a check value */
 396         }
 397         /* SMBus adapter 2 */
 398         if (dmi_check_system(nforce2_dmi_blacklist2)) {
 399                 dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n");
 400                 res2 = -EPERM;
 401                 smbuses[1].base = 0;
 402         } else {
 403                 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1],
 404                                          "SMB2");
 405                 if (res2 < 0) {
 406                         dev_err(&dev->dev, "Error probing SMB2.\n");
 407                         smbuses[1].base = 0;    /* to have a check value */
 408                 }
 409         }
 410         if ((res1 < 0) && (res2 < 0)) {
 411                 /* we did not find even one of the SMBuses, so we give up */
 412                 kfree(smbuses);
 413                 return -ENODEV;
 414         }
 415
 416         nforce2_set_reference(&smbuses[0].adapter);
 417         return 0;
 418 }
 419
 420
 421 static void __devexit nforce2_remove(struct pci_dev *dev)
 422 {
 423         struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
 424
 425         nforce2_set_reference(NULL);
 426         if (smbuses[0].base) {
 427                 i2c_del_adapter(&smbuses[0].adapter);
 428                 release_region(smbuses[0].base, smbuses[0].size);
 429         }
 430         if (smbuses[1].base) {
 431                 i2c_del_adapter(&smbuses[1].adapter);
 432                 release_region(smbuses[1].base, smbuses[1].size);
 433         }
 434         kfree(smbuses);
 435 }
 436
 437 static struct pci_driver nforce2_driver = {
 438         .name           = "nForce2_smbus",
 439         .id_table       = nforce2_ids,
 440         .probe          = nforce2_probe,
 441         .remove         = __devexit_p(nforce2_remove),
 442 };
 443
 444 static int __init nforce2_init(void)
 445 {
 446         return pci_register_driver(&nforce2_driver);
 447 }
 448
 449 static void __exit nforce2_exit(void)
 450 {
 451         pci_unregister_driver(&nforce2_driver);
 452 }
 453
 454 module_init(nforce2_init);
 455 module_exit(nforce2_exit);
 456