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 <asm/io.h>
  54
  55 MODULE_LICENSE("GPL");
  56 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>");
  57 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
  58
  59
  60 struct nforce2_smbus {
  61         struct i2c_adapter adapter;
  62         int base;
  63         int size;
  64         int blockops;
  65         int can_abort;
  66 };
  67
  68
  69 /*
  70  * nVidia nForce2 SMBus control register definitions
  71  * (Newer incarnations use standard BARs 4 and 5 instead)
  72  */
  73 #define NFORCE_PCI_SMB1 0x50
  74 #define NFORCE_PCI_SMB2 0x54
  75
  76
  77 /*
  78  * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
  79  */
  80 #define NVIDIA_SMB_PRTCL        (smbus->base + 0x00)    /* protocol, PEC */
  81 #define NVIDIA_SMB_STS          (smbus->base + 0x01)    /* status */
  82 #define NVIDIA_SMB_ADDR         (smbus->base + 0x02)    /* address */
  83 #define NVIDIA_SMB_CMD          (smbus->base + 0x03)    /* command */
  84 #define NVIDIA_SMB_DATA         (smbus->base + 0x04)    /* 32 data registers */
  85 #define NVIDIA_SMB_BCNT         (smbus->base + 0x24)    /* number of data
  86                                                            bytes */
  87 #define NVIDIA_SMB_STATUS_ABRT  (smbus->base + 0x3c)    /* register used to
  88                                                            check the status of
  89                                                            the abort command */
  90 #define NVIDIA_SMB_CTRL         (smbus->base + 0x3e)    /* control register */
  91
  92 #define NVIDIA_SMB_STATUS_ABRT_STS      0x01            /* Bit to notify that
  93                                                            abort succeeded */
  94 #define NVIDIA_SMB_CTRL_ABORT   0x20
  95 #define NVIDIA_SMB_STS_DONE     0x80
  96 #define NVIDIA_SMB_STS_ALRM     0x40
  97 #define NVIDIA_SMB_STS_RES      0x20
  98 #define NVIDIA_SMB_STS_STATUS   0x1f
  99
 100 #define NVIDIA_SMB_PRTCL_WRITE                  0x00
 101 #define NVIDIA_SMB_PRTCL_READ                   0x01
 102 #define NVIDIA_SMB_PRTCL_QUICK                  0x02
 103 #define NVIDIA_SMB_PRTCL_BYTE                   0x04
 104 #define NVIDIA_SMB_PRTCL_BYTE_DATA              0x06
 105 #define NVIDIA_SMB_PRTCL_WORD_DATA              0x08
 106 #define NVIDIA_SMB_PRTCL_BLOCK_DATA             0x0a
 107 #define NVIDIA_SMB_PRTCL_PEC                    0x80
 108
 109 /* Misc definitions */
 110 #define MAX_TIMEOUT     100
 111
 112 static struct pci_driver nforce2_driver;
 113
 114 static void nforce2_abort(struct i2c_adapter *adap)
 115 {
 116         struct nforce2_smbus *smbus = adap->algo_data;
 117         int timeout = 0;
 118         unsigned char temp;
 119
 120         dev_dbg(&adap->dev, "Aborting current transaction\n");
 121
 122         outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL);
 123         do {
 124                 msleep(1);
 125                 temp = inb_p(NVIDIA_SMB_STATUS_ABRT);
 126         } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) &&
 127                         (timeout++ < MAX_TIMEOUT));
 128         if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS))
 129                 dev_err(&adap->dev, "Can't reset the smbus\n");
 130         outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT);
 131 }
 132
 133 static int nforce2_check_status(struct i2c_adapter *adap)
 134 {
 135         struct nforce2_smbus *smbus = adap->algo_data;
 136         int timeout = 0;
 137         unsigned char temp;
 138
 139         do {
 140                 msleep(1);
 141                 temp = inb_p(NVIDIA_SMB_STS);
 142         } while ((!temp) && (timeout++ < MAX_TIMEOUT));
 143
 144         if (timeout >= MAX_TIMEOUT) {
 145                 dev_dbg(&adap->dev, "SMBus Timeout!\n");
 146                 if (smbus->can_abort)
 147                         nforce2_abort(adap);
 148                 return -1;
 149         }
 150         if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
 151                 dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp);
 152                 return -1;
 153         }
 154         return 0;
 155 }
 156
 157 /* Return -1 on error */
 158 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
 159                 unsigned short flags, char read_write,
 160                 u8 command, int size, union i2c_smbus_data * data)
 161 {
 162         struct nforce2_smbus *smbus = adap->algo_data;
 163         unsigned char protocol, pec;
 164         u8 len;
 165         int i;
 166
 167         protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
 168                 NVIDIA_SMB_PRTCL_WRITE;
 169         pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
 170
 171         switch (size) {
 172
 173                 case I2C_SMBUS_QUICK:
 174                         protocol |= NVIDIA_SMB_PRTCL_QUICK;
 175                         read_write = I2C_SMBUS_WRITE;
 176                         break;
 177
 178                 case I2C_SMBUS_BYTE:
 179                         if (read_write == I2C_SMBUS_WRITE)
 180                                 outb_p(command, NVIDIA_SMB_CMD);
 181                         protocol |= NVIDIA_SMB_PRTCL_BYTE;
 182                         break;
 183
 184                 case I2C_SMBUS_BYTE_DATA:
 185                         outb_p(command, NVIDIA_SMB_CMD);
 186                         if (read_write == I2C_SMBUS_WRITE)
 187                                 outb_p(data->byte, NVIDIA_SMB_DATA);
 188                         protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
 189                         break;
 190
 191                 case I2C_SMBUS_WORD_DATA:
 192                         outb_p(command, NVIDIA_SMB_CMD);
 193                         if (read_write == I2C_SMBUS_WRITE) {
 194                                  outb_p(data->word, NVIDIA_SMB_DATA);
 195                                  outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
 196                         }
 197                         protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
 198                         break;
 199
 200                 case I2C_SMBUS_BLOCK_DATA:
 201                         outb_p(command, NVIDIA_SMB_CMD);
 202                         if (read_write == I2C_SMBUS_WRITE) {
 203                                 len = data->block[0];
 204                                 if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
 205                                         dev_err(&adap->dev,
 206                                                 "Transaction failed "
 207                                                 "(requested block size: %d)\n",
 208                                                 len);
 209                                         return -1;
 210                                 }
 211                                 outb_p(len, NVIDIA_SMB_BCNT);
 212                                 for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
 213                                         outb_p(data->block[i + 1],
 214                                                NVIDIA_SMB_DATA+i);
 215                         }
 216                         protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
 217                         break;
 218
 219                 default:
 220                         dev_err(&adap->dev, "Unsupported transaction %d\n", size);
 221                         return -1;
 222         }
 223
 224         outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
 225         outb_p(protocol, NVIDIA_SMB_PRTCL);
 226
 227         if (nforce2_check_status(adap))
 228                 return -1;
 229
 230         if (read_write == I2C_SMBUS_WRITE)
 231                 return 0;
 232
 233         switch (size) {
 234
 235                 case I2C_SMBUS_BYTE:
 236                 case I2C_SMBUS_BYTE_DATA:
 237                         data->byte = inb_p(NVIDIA_SMB_DATA);
 238                         break;
 239
 240                 case I2C_SMBUS_WORD_DATA:
 241                         data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
 242                         break;
 243
 244                 case I2C_SMBUS_BLOCK_DATA:
 245                         len = inb_p(NVIDIA_SMB_BCNT);
 246                         if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
 247                                 dev_err(&adap->dev, "Transaction failed "
 248                                         "(received block size: 0x%02x)\n",
 249                                         len);
 250                                 return -1;
 251                         }
 252                         for (i = 0; i < len; i++)
 253                                 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
 254                         data->block[0] = len;
 255                         break;
 256         }
 257
 258         return 0;
 259 }
 260
 261
 262 static u32 nforce2_func(struct i2c_adapter *adapter)
 263 {
 264         /* other functionality might be possible, but is not tested */
 265         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 266                I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 267                I2C_FUNC_SMBUS_PEC |
 268                (((struct nforce2_smbus*)adapter->algo_data)->blockops ?
 269                 I2C_FUNC_SMBUS_BLOCK_DATA : 0);
 270 }
 271
 272 static struct i2c_algorithm smbus_algorithm = {
 273         .smbus_xfer     = nforce2_access,
 274         .functionality  = nforce2_func,
 275 };
 276
 277
 278 static struct pci_device_id nforce2_ids[] = {
 279         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
 280         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
 281         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
 282         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
 283         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
 284         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
 285         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
 286         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
 287         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
 288         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
 289         { 0 }
 290 };
 291
 292 MODULE_DEVICE_TABLE (pci, nforce2_ids);
 293
 294
 295 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar,
 296         int alt_reg, struct nforce2_smbus *smbus, const char *name)
 297 {
 298         int error;
 299
 300         smbus->base = pci_resource_start(dev, bar);
 301         if (smbus->base) {
 302                 smbus->size = pci_resource_len(dev, bar);
 303         } else {
 304                 /* Older incarnations of the device used non-standard BARs */
 305                 u16 iobase;
 306
 307                 if (pci_read_config_word(dev, alt_reg, &iobase)
 308                     != PCIBIOS_SUCCESSFUL) {
 309                         dev_err(&dev->dev, "Error reading PCI config for %s\n",
 310                                 name);
 311                         return -1;
 312                 }
 313
 314                 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
 315                 smbus->size = 64;
 316         }
 317
 318         if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
 319                 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
 320                         smbus->base, smbus->base+smbus->size-1, name);
 321                 return -1;
 322         }
 323         smbus->adapter.owner = THIS_MODULE;
 324         smbus->adapter.id = I2C_HW_SMBUS_NFORCE2;
 325         smbus->adapter.class = I2C_CLASS_HWMON;
 326         smbus->adapter.algo = &smbus_algorithm;
 327         smbus->adapter.algo_data = smbus;
 328         smbus->adapter.dev.parent = &dev->dev;
 329         snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
 330                 "SMBus nForce2 adapter at %04x", smbus->base);
 331
 332         error = i2c_add_adapter(&smbus->adapter);
 333         if (error) {
 334                 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
 335                 release_region(smbus->base, smbus->size);
 336                 return -1;
 337         }
 338         dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
 339         return 0;
 340 }
 341
 342
 343 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
 344 {
 345         struct nforce2_smbus *smbuses;
 346         int res1, res2;
 347
 348         /* we support 2 SMBus adapters */
 349         if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
 350                 return -ENOMEM;
 351         pci_set_drvdata(dev, smbuses);
 352
 353         switch(dev->device) {
 354         case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS:
 355         case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS:
 356                 smbuses[0].blockops = 1;
 357                 smbuses[1].blockops = 1;
 358                 smbuses[0].can_abort = 1;
 359                 smbuses[1].can_abort = 1;
 360         }
 361
 362         /* SMBus adapter 1 */
 363         res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
 364         if (res1 < 0) {
 365                 dev_err(&dev->dev, "Error probing SMB1.\n");
 366                 smbuses[0].base = 0;    /* to have a check value */
 367         }
 368         /* SMBus adapter 2 */
 369         res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
 370         if (res2 < 0) {
 371                 dev_err(&dev->dev, "Error probing SMB2.\n");
 372                 smbuses[1].base = 0;    /* to have a check value */
 373         }
 374         if ((res1 < 0) && (res2 < 0)) {
 375                 /* we did not find even one of the SMBuses, so we give up */
 376                 kfree(smbuses);
 377                 return -ENODEV;
 378         }
 379
 380         return 0;
 381 }
 382
 383
 384 static void __devexit nforce2_remove(struct pci_dev *dev)
 385 {
 386         struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
 387
 388         if (smbuses[0].base) {
 389                 i2c_del_adapter(&smbuses[0].adapter);
 390                 release_region(smbuses[0].base, smbuses[0].size);
 391         }
 392         if (smbuses[1].base) {
 393                 i2c_del_adapter(&smbuses[1].adapter);
 394                 release_region(smbuses[1].base, smbuses[1].size);
 395         }
 396         kfree(smbuses);
 397 }
 398
 399 static struct pci_driver nforce2_driver = {
 400         .name           = "nForce2_smbus",
 401         .id_table       = nforce2_ids,
 402         .probe          = nforce2_probe,
 403         .remove         = __devexit_p(nforce2_remove),
 404 };
 405
 406 static int __init nforce2_init(void)
 407 {
 408         return pci_register_driver(&nforce2_driver);
 409 }
 410
 411 static void __exit nforce2_exit(void)
 412 {
 413         pci_unregister_driver(&nforce2_driver);
 414 }
 415
 416 module_init(nforce2_init);
 417 module_exit(nforce2_exit);
 418