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     nForce MCP51                0264
  35     nForce MCP55                0368
  36     nForce MCP61                03EB
  37     nForce MCP65                0446
  38     nForce MCP67                0542
  39     nForce MCP73                07D8
  40     nForce MCP78S               0752
  41     nForce MCP79                0AA2
  42
  43     This driver supports the 2 SMBuses that are included in the MCP of the
  44     nForce2/3/4/5xx chipsets.
  45 */
  46
  47 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
  48
  49 #include <linux/module.h>
  50 #include <linux/pci.h>
  51 #include <linux/kernel.h>
  52 #include <linux/stddef.h>
  53 #include <linux/ioport.h>
  54 #include <linux/init.h>
  55 #include <linux/i2c.h>
  56 #include <linux/delay.h>
  57 #include <linux/dmi.h>
  58 #include <linux/acpi.h>
  59 #include <linux/slab.h>
  60 #include <linux/io.h>
  61
  62 MODULE_LICENSE("GPL");
  63 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>");
  64 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
  65
  66
  67 struct nforce2_smbus {
  68         struct i2c_adapter adapter;
  69         int base;
  70         int size;
  71         int blockops;
  72         int can_abort;
  73 };
  74
  75
  76 /*
  77  * nVidia nForce2 SMBus control register definitions
  78  * (Newer incarnations use standard BARs 4 and 5 instead)
  79  */
  80 #define NFORCE_PCI_SMB1 0x50
  81 #define NFORCE_PCI_SMB2 0x54
  82
  83
  84 /*
  85  * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
  86  */
  87 #define NVIDIA_SMB_PRTCL        (smbus->base + 0x00)    /* protocol, PEC */
  88 #define NVIDIA_SMB_STS          (smbus->base + 0x01)    /* status */
  89 #define NVIDIA_SMB_ADDR         (smbus->base + 0x02)    /* address */
  90 #define NVIDIA_SMB_CMD          (smbus->base + 0x03)    /* command */
  91 #define NVIDIA_SMB_DATA         (smbus->base + 0x04)    /* 32 data registers */
  92 #define NVIDIA_SMB_BCNT         (smbus->base + 0x24)    /* number of data
  93                                                            bytes */
  94 #define NVIDIA_SMB_STATUS_ABRT  (smbus->base + 0x3c)    /* register used to
  95                                                            check the status of
  96                                                            the abort command */
  97 #define NVIDIA_SMB_CTRL         (smbus->base + 0x3e)    /* control register */
  98
  99 #define NVIDIA_SMB_STATUS_ABRT_STS      0x01            /* Bit to notify that
 100                                                            abort succeeded */
 101 #define NVIDIA_SMB_CTRL_ABORT   0x20
 102 #define NVIDIA_SMB_STS_DONE     0x80
 103 #define NVIDIA_SMB_STS_ALRM     0x40
 104 #define NVIDIA_SMB_STS_RES      0x20
 105 #define NVIDIA_SMB_STS_STATUS   0x1f
 106
 107 #define NVIDIA_SMB_PRTCL_WRITE                  0x00
 108 #define NVIDIA_SMB_PRTCL_READ                   0x01
 109 #define NVIDIA_SMB_PRTCL_QUICK                  0x02
 110 #define NVIDIA_SMB_PRTCL_BYTE                   0x04
 111 #define NVIDIA_SMB_PRTCL_BYTE_DATA              0x06
 112 #define NVIDIA_SMB_PRTCL_WORD_DATA              0x08
 113 #define NVIDIA_SMB_PRTCL_BLOCK_DATA             0x0a
 114 #define NVIDIA_SMB_PRTCL_PEC                    0x80
 115
 116 /* Misc definitions */
 117 #define MAX_TIMEOUT     100
 118
 119 /* We disable the second SMBus channel on these boards */
 120 static struct dmi_system_id __devinitdata nforce2_dmi_blacklist2[] = {
 121         {
 122                 .ident = "DFI Lanparty NF4 Expert",
 123                 .matches = {
 124                         DMI_MATCH(DMI_BOARD_VENDOR, "DFI Corp,LTD"),
 125                         DMI_MATCH(DMI_BOARD_NAME, "LP UT NF4 Expert"),
 126                 },
 127         },
 128         { }
 129 };
 130
 131 static struct pci_driver nforce2_driver;
 132
 133 /* For multiplexing support, we need a global reference to the 1st
 134    SMBus channel */
 135 #if defined CONFIG_I2C_NFORCE2_S4985 || defined CONFIG_I2C_NFORCE2_S4985_MODULE
 136 struct i2c_adapter *nforce2_smbus;
 137 EXPORT_SYMBOL_GPL(nforce2_smbus);
 138
 139 static void nforce2_set_reference(struct i2c_adapter *adap)
 140 {
 141         nforce2_smbus = adap;
 142 }
 143 #else
 144 static inline void nforce2_set_reference(struct i2c_adapter *adap) { }
 145 #endif
 146
 147 static void nforce2_abort(struct i2c_adapter *adap)
 148 {
 149         struct nforce2_smbus *smbus = adap->algo_data;
 150         int timeout = 0;
 151         unsigned char temp;
 152
 153         dev_dbg(&adap->dev, "Aborting current transaction\n");
 154
 155         outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL);
 156         do {
 157                 msleep(1);
 158                 temp = inb_p(NVIDIA_SMB_STATUS_ABRT);
 159         } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) &&
 160                         (timeout++ < MAX_TIMEOUT));
 161         if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS))
 162                 dev_err(&adap->dev, "Can't reset the smbus\n");
 163         outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT);
 164 }
 165
 166 static int nforce2_check_status(struct i2c_adapter *adap)
 167 {
 168         struct nforce2_smbus *smbus = adap->algo_data;
 169         int timeout = 0;
 170         unsigned char temp;
 171
 172         do {
 173                 msleep(1);
 174                 temp = inb_p(NVIDIA_SMB_STS);
 175         } while ((!temp) && (timeout++ < MAX_TIMEOUT));
 176
 177         if (timeout > MAX_TIMEOUT) {
 178                 dev_dbg(&adap->dev, "SMBus Timeout!\n");
 179                 if (smbus->can_abort)
 180                         nforce2_abort(adap);
 181                 return -ETIMEDOUT;
 182         }
 183         if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
 184                 dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp);
 185                 return -EIO;
 186         }
 187         return 0;
 188 }
 189
 190 /* Return negative errno on error */
 191 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
 192                 unsigned short flags, char read_write,
 193                 u8 command, int size, union i2c_smbus_data * data)
 194 {
 195         struct nforce2_smbus *smbus = adap->algo_data;
 196         unsigned char protocol, pec;
 197         u8 len;
 198         int i, status;
 199
 200         protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
 201                 NVIDIA_SMB_PRTCL_WRITE;
 202         pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
 203
 204         switch (size) {
 205
 206                 case I2C_SMBUS_QUICK:
 207                         protocol |= NVIDIA_SMB_PRTCL_QUICK;
 208                         read_write = I2C_SMBUS_WRITE;
 209                         break;
 210
 211                 case I2C_SMBUS_BYTE:
 212                         if (read_write == I2C_SMBUS_WRITE)
 213                                 outb_p(command, NVIDIA_SMB_CMD);
 214                         protocol |= NVIDIA_SMB_PRTCL_BYTE;
 215                         break;
 216
 217                 case I2C_SMBUS_BYTE_DATA:
 218                         outb_p(command, NVIDIA_SMB_CMD);
 219                         if (read_write == I2C_SMBUS_WRITE)
 220                                 outb_p(data->byte, NVIDIA_SMB_DATA);
 221                         protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
 222                         break;
 223
 224                 case I2C_SMBUS_WORD_DATA:
 225                         outb_p(command, NVIDIA_SMB_CMD);
 226                         if (read_write == I2C_SMBUS_WRITE) {
 227                                  outb_p(data->word, NVIDIA_SMB_DATA);
 228                                  outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
 229                         }
 230                         protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
 231                         break;
 232
 233                 case I2C_SMBUS_BLOCK_DATA:
 234                         outb_p(command, NVIDIA_SMB_CMD);
 235                         if (read_write == I2C_SMBUS_WRITE) {
 236                                 len = data->block[0];
 237                                 if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
 238                                         dev_err(&adap->dev,
 239                                                 "Transaction failed "
 240                                                 "(requested block size: %d)\n",
 241                                                 len);
 242                                         return -EINVAL;
 243                                 }
 244                                 outb_p(len, NVIDIA_SMB_BCNT);
 245                                 for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
 246                                         outb_p(data->block[i + 1],
 247                                                NVIDIA_SMB_DATA+i);
 248                         }
 249                         protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
 250                         break;
 251
 252                 default:
 253                         dev_err(&adap->dev, "Unsupported transaction %d\n", size);
 254                         return -EOPNOTSUPP;
 255         }
 256
 257         outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
 258         outb_p(protocol, NVIDIA_SMB_PRTCL);
 259
 260         status = nforce2_check_status(adap);
 261         if (status)
 262                 return status;
 263
 264         if (read_write == I2C_SMBUS_WRITE)
 265                 return 0;
 266
 267         switch (size) {
 268
 269                 case I2C_SMBUS_BYTE:
 270                 case I2C_SMBUS_BYTE_DATA:
 271                         data->byte = inb_p(NVIDIA_SMB_DATA);
 272                         break;
 273
 274                 case I2C_SMBUS_WORD_DATA:
 275                         data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
 276                         break;
 277
 278                 case I2C_SMBUS_BLOCK_DATA:
 279                         len = inb_p(NVIDIA_SMB_BCNT);
 280                         if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
 281                                 dev_err(&adap->dev, "Transaction failed "
 282                                         "(received block size: 0x%02x)\n",
 283                                         len);
 284                                 return -EPROTO;
 285                         }
 286                         for (i = 0; i < len; i++)
 287                                 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
 288                         data->block[0] = len;
 289                         break;
 290         }
 291
 292         return 0;
 293 }
 294
 295
 296 static u32 nforce2_func(struct i2c_adapter *adapter)
 297 {
 298         /* other functionality might be possible, but is not tested */
 299         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 300                I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 301                I2C_FUNC_SMBUS_PEC |
 302                (((struct nforce2_smbus*)adapter->algo_data)->blockops ?
 303                 I2C_FUNC_SMBUS_BLOCK_DATA : 0);
 304 }
 305
 306 static struct i2c_algorithm smbus_algorithm = {
 307         .smbus_xfer     = nforce2_access,
 308         .functionality  = nforce2_func,
 309 };
 310
 311
 312 static DEFINE_PCI_DEVICE_TABLE(nforce2_ids) = {
 313         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
 314         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
 315         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
 316         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
 317         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
 318         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
 319         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
 320         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
 321         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
 322         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
 323         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP67_SMBUS) },
 324         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_SMBUS) },
 325         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP78S_SMBUS) },
 326         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP79_SMBUS) },
 327         { 0 }
 328 };
 329
 330 MODULE_DEVICE_TABLE (pci, nforce2_ids);
 331
 332
 333 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar,
 334         int alt_reg, struct nforce2_smbus *smbus, const char *name)
 335 {
 336         int error;
 337
 338         smbus->base = pci_resource_start(dev, bar);
 339         if (smbus->base) {
 340                 smbus->size = pci_resource_len(dev, bar);
 341         } else {
 342                 /* Older incarnations of the device used non-standard BARs */
 343                 u16 iobase;
 344
 345                 if (pci_read_config_word(dev, alt_reg, &iobase)
 346                     != PCIBIOS_SUCCESSFUL) {
 347                         dev_err(&dev->dev, "Error reading PCI config for %s\n",
 348                                 name);
 349                         return -EIO;
 350                 }
 351
 352                 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
 353                 smbus->size = 64;
 354         }
 355
 356         error = acpi_check_region(smbus->base, smbus->size,
 357                                   nforce2_driver.name);
 358         if (error)
 359                 return error;
 360
 361         if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
 362                 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
 363                         smbus->base, smbus->base+smbus->size-1, name);
 364                 return -EBUSY;
 365         }
 366         smbus->adapter.owner = THIS_MODULE;
 367         smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
 368         smbus->adapter.algo = &smbus_algorithm;
 369         smbus->adapter.algo_data = smbus;
 370         smbus->adapter.dev.parent = &dev->dev;
 371         snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
 372                 "SMBus nForce2 adapter at %04x", smbus->base);
 373
 374         error = i2c_add_adapter(&smbus->adapter);
 375         if (error) {
 376                 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
 377                 release_region(smbus->base, smbus->size);
 378                 return error;
 379         }
 380         dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
 381         return 0;
 382 }
 383
 384
 385 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
 386 {
 387         struct nforce2_smbus *smbuses;
 388         int res1, res2;
 389
 390         /* we support 2 SMBus adapters */
 391         if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
 392                 return -ENOMEM;
 393         pci_set_drvdata(dev, smbuses);
 394
 395         switch(dev->device) {
 396         case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS:
 397         case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS:
 398         case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS:
 399                 smbuses[0].blockops = 1;
 400                 smbuses[1].blockops = 1;
 401                 smbuses[0].can_abort = 1;
 402                 smbuses[1].can_abort = 1;
 403         }
 404
 405         /* SMBus adapter 1 */
 406         res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
 407         if (res1 < 0)
 408                 smbuses[0].base = 0;    /* to have a check value */
 409
 410         /* SMBus adapter 2 */
 411         if (dmi_check_system(nforce2_dmi_blacklist2)) {
 412                 dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n");
 413                 res2 = -EPERM;
 414                 smbuses[1].base = 0;
 415         } else {
 416                 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1],
 417                                          "SMB2");
 418                 if (res2 < 0)
 419                         smbuses[1].base = 0;    /* to have a check value */
 420         }
 421
 422         if ((res1 < 0) && (res2 < 0)) {
 423                 /* we did not find even one of the SMBuses, so we give up */
 424                 kfree(smbuses);
 425                 return -ENODEV;
 426         }
 427
 428         nforce2_set_reference(&smbuses[0].adapter);
 429         return 0;
 430 }
 431
 432
 433 static void __devexit nforce2_remove(struct pci_dev *dev)
 434 {
 435         struct nforce2_smbus *smbuses = pci_get_drvdata(dev);
 436
 437         nforce2_set_reference(NULL);
 438         if (smbuses[0].base) {
 439                 i2c_del_adapter(&smbuses[0].adapter);
 440                 release_region(smbuses[0].base, smbuses[0].size);
 441         }
 442         if (smbuses[1].base) {
 443                 i2c_del_adapter(&smbuses[1].adapter);
 444                 release_region(smbuses[1].base, smbuses[1].size);
 445         }
 446         kfree(smbuses);
 447 }
 448
 449 static struct pci_driver nforce2_driver = {
 450         .name           = "nForce2_smbus",
 451         .id_table       = nforce2_ids,
 452         .probe          = nforce2_probe,
 453         .remove         = __devexit_p(nforce2_remove),
 454 };
 455
 456 static int __init nforce2_init(void)
 457 {
 458         return pci_register_driver(&nforce2_driver);
 459 }
 460
 461 static void __exit nforce2_exit(void)
 462 {
 463         pci_unregister_driver(&nforce2_driver);
 464 }
 465
 466 module_init(nforce2_init);
 467 module_exit(nforce2_exit);
 468