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 static void nforce2_abort(struct i2c_adapter *adap)
 128 {
 129         struct nforce2_smbus *smbus = adap->algo_data;
 130         int timeout = 0;
 131         unsigned char temp;
 132
 133         dev_dbg(&adap->dev, "Aborting current transaction\n");
 134
 135         outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL);
 136         do {
 137                 msleep(1);
 138                 temp = inb_p(NVIDIA_SMB_STATUS_ABRT);
 139         } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) &&
 140                         (timeout++ < MAX_TIMEOUT));
 141         if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS))
 142                 dev_err(&adap->dev, "Can't reset the smbus\n");
 143         outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT);
 144 }
 145
 146 static int nforce2_check_status(struct i2c_adapter *adap)
 147 {
 148         struct nforce2_smbus *smbus = adap->algo_data;
 149         int timeout = 0;
 150         unsigned char temp;
 151
 152         do {
 153                 msleep(1);
 154                 temp = inb_p(NVIDIA_SMB_STS);
 155         } while ((!temp) && (timeout++ < MAX_TIMEOUT));
 156
 157         if (timeout >= MAX_TIMEOUT) {
 158                 dev_dbg(&adap->dev, "SMBus Timeout!\n");
 159                 if (smbus->can_abort)
 160                         nforce2_abort(adap);
 161                 return -1;
 162         }
 163         if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
 164                 dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp);
 165                 return -1;
 166         }
 167         return 0;
 168 }
 169
 170 /* Return -1 on error */
 171 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
 172                 unsigned short flags, char read_write,
 173                 u8 command, int size, union i2c_smbus_data * data)
 174 {
 175         struct nforce2_smbus *smbus = adap->algo_data;
 176         unsigned char protocol, pec;
 177         u8 len;
 178         int i;
 179
 180         protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
 181                 NVIDIA_SMB_PRTCL_WRITE;
 182         pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
 183
 184         switch (size) {
 185
 186                 case I2C_SMBUS_QUICK:
 187                         protocol |= NVIDIA_SMB_PRTCL_QUICK;
 188                         read_write = I2C_SMBUS_WRITE;
 189                         break;
 190
 191                 case I2C_SMBUS_BYTE:
 192                         if (read_write == I2C_SMBUS_WRITE)
 193                                 outb_p(command, NVIDIA_SMB_CMD);
 194                         protocol |= NVIDIA_SMB_PRTCL_BYTE;
 195                         break;
 196
 197                 case I2C_SMBUS_BYTE_DATA:
 198                         outb_p(command, NVIDIA_SMB_CMD);
 199                         if (read_write == I2C_SMBUS_WRITE)
 200                                 outb_p(data->byte, NVIDIA_SMB_DATA);
 201                         protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
 202                         break;
 203
 204                 case I2C_SMBUS_WORD_DATA:
 205                         outb_p(command, NVIDIA_SMB_CMD);
 206                         if (read_write == I2C_SMBUS_WRITE) {
 207                                  outb_p(data->word, NVIDIA_SMB_DATA);
 208                                  outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
 209                         }
 210                         protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
 211                         break;
 212
 213                 case I2C_SMBUS_BLOCK_DATA:
 214                         outb_p(command, NVIDIA_SMB_CMD);
 215                         if (read_write == I2C_SMBUS_WRITE) {
 216                                 len = data->block[0];
 217                                 if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
 218                                         dev_err(&adap->dev,
 219                                                 "Transaction failed "
 220                                                 "(requested block size: %d)\n",
 221                                                 len);
 222                                         return -1;
 223                                 }
 224                                 outb_p(len, NVIDIA_SMB_BCNT);
 225                                 for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
 226                                         outb_p(data->block[i + 1],
 227                                                NVIDIA_SMB_DATA+i);
 228                         }
 229                         protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
 230                         break;
 231
 232                 default:
 233                         dev_err(&adap->dev, "Unsupported transaction %d\n", size);
 234                         return -1;
 235         }
 236
 237         outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
 238         outb_p(protocol, NVIDIA_SMB_PRTCL);
 239
 240         if (nforce2_check_status(adap))
 241                 return -1;
 242
 243         if (read_write == I2C_SMBUS_WRITE)
 244                 return 0;
 245
 246         switch (size) {
 247
 248                 case I2C_SMBUS_BYTE:
 249                 case I2C_SMBUS_BYTE_DATA:
 250                         data->byte = inb_p(NVIDIA_SMB_DATA);
 251                         break;
 252
 253                 case I2C_SMBUS_WORD_DATA:
 254                         data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
 255                         break;
 256
 257                 case I2C_SMBUS_BLOCK_DATA:
 258                         len = inb_p(NVIDIA_SMB_BCNT);
 259                         if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
 260                                 dev_err(&adap->dev, "Transaction failed "
 261                                         "(received block size: 0x%02x)\n",
 262                                         len);
 263                                 return -1;
 264                         }
 265                         for (i = 0; i < len; i++)
 266                                 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
 267                         data->block[0] = len;
 268                         break;
 269         }
 270
 271         return 0;
 272 }
 273
 274
 275 static u32 nforce2_func(struct i2c_adapter *adapter)
 276 {
 277         /* other functionality might be possible, but is not tested */
 278         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 279                I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 280                I2C_FUNC_SMBUS_PEC |
 281                (((struct nforce2_smbus*)adapter->algo_data)->blockops ?
 282                 I2C_FUNC_SMBUS_BLOCK_DATA : 0);
 283 }
 284
 285 static struct i2c_algorithm smbus_algorithm = {
 286         .smbus_xfer     = nforce2_access,
 287         .functionality  = nforce2_func,
 288 };
 289
 290
 291 static struct pci_device_id nforce2_ids[] = {
 292         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
 293         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
 294         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
 295         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
 296         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
 297         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
 298         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
 299         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
 300         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
 301         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
 302         { 0 }
 303 };
 304
 305 MODULE_DEVICE_TABLE (pci, nforce2_ids);
 306
 307
 308 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar,
 309         int alt_reg, struct nforce2_smbus *smbus, const char *name)
 310 {
 311         int error;
 312
 313         smbus->base = pci_resource_start(dev, bar);
 314         if (smbus->base) {
 315                 smbus->size = pci_resource_len(dev, bar);
 316         } else {
 317                 /* Older incarnations of the device used non-standard BARs */
 318                 u16 iobase;
 319
 320                 if (pci_read_config_word(dev, alt_reg, &iobase)
 321                     != PCIBIOS_SUCCESSFUL) {
 322                         dev_err(&dev->dev, "Error reading PCI config for %s\n",
 323                                 name);
 324                         return -1;
 325                 }
 326
 327                 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
 328                 smbus->size = 64;
 329         }
 330
 331         if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
 332                 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
 333                         smbus->base, smbus->base+smbus->size-1, name);
 334                 return -1;
 335         }
 336         smbus->adapter.owner = THIS_MODULE;
 337         smbus->adapter.id = I2C_HW_SMBUS_NFORCE2;
 338         smbus->adapter.class = I2C_CLASS_HWMON;
 339         smbus->adapter.algo = &smbus_algorithm;
 340         smbus->adapter.algo_data = smbus;
 341         smbus->adapter.dev.parent = &dev->dev;
 342         snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
 343                 "SMBus nForce2 adapter at %04x", smbus->base);
 344
 345         error = i2c_add_adapter(&smbus->adapter);
 346         if (error) {
 347                 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
 348                 release_region(smbus->base, smbus->size);
 349                 return -1;
 350         }
 351         dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
 352         return 0;
 353 }
 354
 355
 356 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
 357 {
 358         struct nforce2_smbus *smbuses;
 359         int res1, res2;
 360
 361         /* we support 2 SMBus adapters */
 362         if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
 363                 return -ENOMEM;
 364         pci_set_drvdata(dev, smbuses);
 365
 366         switch(dev->device) {
 367         case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS:
 368         case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS:
 369         case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS:
 370                 smbuses[0].blockops = 1;
 371                 smbuses[1].blockops = 1;
 372                 smbuses[0].can_abort = 1;
 373                 smbuses[1].can_abort = 1;
 374         }
 375
 376         /* SMBus adapter 1 */
 377         res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
 378         if (res1 < 0) {
 379                 dev_err(&dev->dev, "Error probing SMB1.\n");
 380                 smbuses[0].base = 0;    /* to have a check value */
 381         }
 382         /* SMBus adapter 2 */
 383         if (dmi_check_system(nforce2_dmi_blacklist2)) {
 384                 dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n");
 385                 res2 = -EPERM;
 386                 smbuses[1].base = 0;
 387         } else {
 388                 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1],
 389                                          "SMB2");
 390                 if (res2 < 0) {
 391                         dev_err(&dev->dev, "Error probing SMB2.\n");
 392                         smbuses[1].base = 0;    /* to have a check value */
 393                 }
 394         }
 395         if ((res1 < 0) && (res2 < 0)) {
 396                 /* we did not find even one of the SMBuses, so we give up */
 397                 kfree(smbuses);
 398                 return -ENODEV;
 399         }
 400
 401         return 0;
 402 }
 403
 404
 405 static void __devexit nforce2_remove(struct pci_dev *dev)
 406 {
 407         struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
 408
 409         if (smbuses[0].base) {
 410                 i2c_del_adapter(&smbuses[0].adapter);
 411                 release_region(smbuses[0].base, smbuses[0].size);
 412         }
 413         if (smbuses[1].base) {
 414                 i2c_del_adapter(&smbuses[1].adapter);
 415                 release_region(smbuses[1].base, smbuses[1].size);
 416         }
 417         kfree(smbuses);
 418 }
 419
 420 static struct pci_driver nforce2_driver = {
 421         .name           = "nForce2_smbus",
 422         .id_table       = nforce2_ids,
 423         .probe          = nforce2_probe,
 424         .remove         = __devexit_p(nforce2_remove),
 425 };
 426
 427 static int __init nforce2_init(void)
 428 {
 429         return pci_register_driver(&nforce2_driver);
 430 }
 431
 432 static void __exit nforce2_exit(void)
 433 {
 434         pci_unregister_driver(&nforce2_driver);
 435 }
 436
 437 module_init(nforce2_init);
 438 module_exit(nforce2_exit);
 439