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