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
  34     This driver supports the 2 SMBuses that are included in the MCP of the
  35     nForce2/3/4 chipsets.
  36 */
  37
  38 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
  39
  40 #include <linux/config.h>
  41 #include <linux/module.h>
  42 #include <linux/pci.h>
  43 #include <linux/kernel.h>
  44 #include <linux/stddef.h>
  45 #include <linux/sched.h>
  46 #include <linux/ioport.h>
  47 #include <linux/init.h>
  48 #include <linux/i2c.h>
  49 #include <linux/delay.h>
  50 #include <asm/io.h>
  51
  52 MODULE_LICENSE("GPL");
  53 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@arcor.de>");
  54 MODULE_DESCRIPTION("nForce2 SMBus driver");
  55
  56
  57 struct nforce2_smbus {
  58         struct pci_dev *dev;
  59         struct i2c_adapter adapter;
  60         int base;
  61         int size;
  62 };
  63
  64
  65 /*
  66  * nVidia nForce2 SMBus control register definitions
  67  */
  68 #define NFORCE_PCI_SMB1 0x50
  69 #define NFORCE_PCI_SMB2 0x54
  70
  71
  72 /*
  73  * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
  74  */
  75 #define NVIDIA_SMB_PRTCL        (smbus->base + 0x00)    /* protocol, PEC */
  76 #define NVIDIA_SMB_STS          (smbus->base + 0x01)    /* status */
  77 #define NVIDIA_SMB_ADDR         (smbus->base + 0x02)    /* address */
  78 #define NVIDIA_SMB_CMD          (smbus->base + 0x03)    /* command */
  79 #define NVIDIA_SMB_DATA         (smbus->base + 0x04)    /* 32 data registers */
  80 #define NVIDIA_SMB_BCNT         (smbus->base + 0x24)    /* number of data bytes */
  81 #define NVIDIA_SMB_ALRM_A       (smbus->base + 0x25)    /* alarm address */
  82 #define NVIDIA_SMB_ALRM_D       (smbus->base + 0x26)    /* 2 bytes alarm data */
  83
  84 #define NVIDIA_SMB_STS_DONE     0x80
  85 #define NVIDIA_SMB_STS_ALRM     0x40
  86 #define NVIDIA_SMB_STS_RES      0x20
  87 #define NVIDIA_SMB_STS_STATUS   0x1f
  88
  89 #define NVIDIA_SMB_PRTCL_WRITE                  0x00
  90 #define NVIDIA_SMB_PRTCL_READ                   0x01
  91 #define NVIDIA_SMB_PRTCL_QUICK                  0x02
  92 #define NVIDIA_SMB_PRTCL_BYTE                   0x04
  93 #define NVIDIA_SMB_PRTCL_BYTE_DATA              0x06
  94 #define NVIDIA_SMB_PRTCL_WORD_DATA              0x08
  95 #define NVIDIA_SMB_PRTCL_BLOCK_DATA             0x0a
  96 #define NVIDIA_SMB_PRTCL_PROC_CALL              0x0c
  97 #define NVIDIA_SMB_PRTCL_BLOCK_PROC_CALL        0x0d
  98 #define NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA         0x4a
  99 #define NVIDIA_SMB_PRTCL_PEC                    0x80
 100
 101
 102 /* Other settings */
 103 #define MAX_TIMEOUT 256
 104
 105
 106
 107 static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
 108                        unsigned short flags, char read_write,
 109                        u8 command, int size, union i2c_smbus_data *data);
 110 static u32 nforce2_func(struct i2c_adapter *adapter);
 111
 112
 113 static struct i2c_algorithm smbus_algorithm = {
 114         .name = "Non-I2C SMBus adapter",
 115         .id = I2C_ALGO_SMBUS,
 116         .smbus_xfer = nforce2_access,
 117         .functionality = nforce2_func,
 118 };
 119
 120 static struct i2c_adapter nforce2_adapter = {
 121         .owner          = THIS_MODULE,
 122         .class          = I2C_CLASS_HWMON,
 123         .algo           = &smbus_algorithm,
 124         .name           = "unset",
 125 };
 126
 127 /* Return -1 on error. See smbus.h for more information */
 128 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
 129                 unsigned short flags, char read_write,
 130                 u8 command, int size, union i2c_smbus_data * data)
 131 {
 132         struct nforce2_smbus *smbus = adap->algo_data;
 133         unsigned char protocol, pec, temp;
 134         unsigned char len = 0; /* to keep the compiler quiet */
 135         int timeout = 0;
 136         int i;
 137
 138         protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
 139                 NVIDIA_SMB_PRTCL_WRITE;
 140         pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
 141
 142         switch (size) {
 143
 144                 case I2C_SMBUS_QUICK:
 145                         protocol |= NVIDIA_SMB_PRTCL_QUICK;
 146                         read_write = I2C_SMBUS_WRITE;
 147                         break;
 148
 149                 case I2C_SMBUS_BYTE:
 150                         if (read_write == I2C_SMBUS_WRITE)
 151                                 outb_p(command, NVIDIA_SMB_CMD);
 152                         protocol |= NVIDIA_SMB_PRTCL_BYTE;
 153                         break;
 154
 155                 case I2C_SMBUS_BYTE_DATA:
 156                         outb_p(command, NVIDIA_SMB_CMD);
 157                         if (read_write == I2C_SMBUS_WRITE)
 158                                 outb_p(data->byte, NVIDIA_SMB_DATA);
 159                         protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
 160                         break;
 161
 162                 case I2C_SMBUS_WORD_DATA:
 163                         outb_p(command, NVIDIA_SMB_CMD);
 164                         if (read_write == I2C_SMBUS_WRITE) {
 165                                  outb_p(data->word, NVIDIA_SMB_DATA);
 166                                  outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
 167                         }
 168                         protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
 169                         break;
 170
 171                 case I2C_SMBUS_BLOCK_DATA:
 172                         outb_p(command, NVIDIA_SMB_CMD);
 173                         if (read_write == I2C_SMBUS_WRITE) {
 174                                 len = min_t(u8, data->block[0], 32);
 175                                 outb_p(len, NVIDIA_SMB_BCNT);
 176                                 for (i = 0; i < len; i++)
 177                                         outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
 178                         }
 179                         protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
 180                         break;
 181
 182                 case I2C_SMBUS_I2C_BLOCK_DATA:
 183                         len = min_t(u8, data->block[0], 32);
 184                         outb_p(command, NVIDIA_SMB_CMD);
 185                         outb_p(len, NVIDIA_SMB_BCNT);
 186                         if (read_write == I2C_SMBUS_WRITE)
 187                                 for (i = 0; i < len; i++)
 188                                         outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
 189                         protocol |= NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA;
 190                         break;
 191
 192                 case I2C_SMBUS_PROC_CALL:
 193                         dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
 194                         return -1;
 195                         /*
 196                         outb_p(command, NVIDIA_SMB_CMD);
 197                         outb_p(data->word, NVIDIA_SMB_DATA);
 198                         outb_p(data->word >> 8, NVIDIA_SMB_DATA + 1);
 199                         protocol = NVIDIA_SMB_PRTCL_PROC_CALL | pec;
 200                         read_write = I2C_SMBUS_READ;
 201                         break;
 202                          */
 203
 204                 case I2C_SMBUS_BLOCK_PROC_CALL:
 205                         dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n");
 206                         return -1;
 207                         /*
 208                         protocol |= pec;
 209                         len = min_t(u8, data->block[0], 31);
 210                         outb_p(command, NVIDIA_SMB_CMD);
 211                         outb_p(len, NVIDIA_SMB_BCNT);
 212                         for (i = 0; i < len; i++)
 213                                 outb_p(data->block[i + 1], NVIDIA_SMB_DATA + i);
 214                         protocol = NVIDIA_SMB_PRTCL_BLOCK_PROC_CALL | pec;
 215                         read_write = I2C_SMBUS_READ;
 216                         break;
 217                         */
 218
 219                 case I2C_SMBUS_WORD_DATA_PEC:
 220                 case I2C_SMBUS_BLOCK_DATA_PEC:
 221                 case I2C_SMBUS_PROC_CALL_PEC:
 222                 case I2C_SMBUS_BLOCK_PROC_CALL_PEC:
 223                         dev_err(&adap->dev, "Unexpected software PEC transaction %d\n.", size);
 224                         return -1;
 225
 226                 default:
 227                         dev_err(&adap->dev, "Unsupported transaction %d\n", size);
 228                         return -1;
 229         }
 230
 231         outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
 232         outb_p(protocol, NVIDIA_SMB_PRTCL);
 233
 234         temp = inb_p(NVIDIA_SMB_STS);
 235
 236 #if 0
 237         do {
 238                 i2c_do_pause(1);
 239                 temp = inb_p(NVIDIA_SMB_STS);
 240         } while (((temp & NVIDIA_SMB_STS_DONE) == 0) && (timeout++ < MAX_TIMEOUT));
 241 #endif
 242         if (~temp & NVIDIA_SMB_STS_DONE) {
 243                 udelay(500);
 244                 temp = inb_p(NVIDIA_SMB_STS);
 245         }
 246         if (~temp & NVIDIA_SMB_STS_DONE) {
 247                 msleep(10);
 248                 temp = inb_p(NVIDIA_SMB_STS);
 249         }
 250
 251         if ((timeout >= MAX_TIMEOUT) || (~temp & NVIDIA_SMB_STS_DONE)
 252                 || (temp & NVIDIA_SMB_STS_STATUS))
 253                 return -1;
 254
 255         if (read_write == I2C_SMBUS_WRITE)
 256                 return 0;
 257
 258         switch (size) {
 259
 260                 case I2C_SMBUS_BYTE:
 261                 case I2C_SMBUS_BYTE_DATA:
 262                         data->byte = inb_p(NVIDIA_SMB_DATA);
 263                         break;
 264
 265                 case I2C_SMBUS_WORD_DATA:
 266                 /* case I2C_SMBUS_PROC_CALL: not supported */
 267                         data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
 268                         break;
 269
 270                 case I2C_SMBUS_BLOCK_DATA:
 271                 /* case I2C_SMBUS_BLOCK_PROC_CALL: not supported */
 272                         len = inb_p(NVIDIA_SMB_BCNT);
 273                         len = min_t(u8, len, 32);
 274                 case I2C_SMBUS_I2C_BLOCK_DATA:
 275                         for (i = 0; i < len; i++)
 276                                 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
 277                         data->block[0] = len;
 278                         break;
 279         }
 280
 281         return 0;
 282 }
 283
 284
 285 static u32 nforce2_func(struct i2c_adapter *adapter)
 286 {
 287         /* other functionality might be possible, but is not tested */
 288         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 289             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA /* |
 290             I2C_FUNC_SMBUS_BLOCK_DATA */;
 291 }
 292
 293
 294 static struct pci_device_id nforce2_ids[] = {
 295         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
 296         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
 297         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
 298         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
 299         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
 300         { 0 }
 301 };
 302
 303
 304 MODULE_DEVICE_TABLE (pci, nforce2_ids);
 305
 306
 307 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int reg,
 308         struct nforce2_smbus *smbus, char *name)
 309 {
 310         u16 iobase;
 311         int error;
 312
 313         if (pci_read_config_word(dev, reg, &iobase) != PCIBIOS_SUCCESSFUL) {
 314                 dev_err(&smbus->adapter.dev, "Error reading PCI config for %s\n", name);
 315                 return -1;
 316         }
 317         smbus->dev  = dev;
 318         smbus->base = iobase & 0xfffc;
 319         smbus->size = 8;
 320
 321         if (!request_region(smbus->base, smbus->size, "nForce2 SMBus")) {
 322                 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
 323                         smbus->base, smbus->base+smbus->size-1, name);
 324                 return -1;
 325         }
 326         smbus->adapter = nforce2_adapter;
 327         smbus->adapter.algo_data = smbus;
 328         smbus->adapter.dev.parent = &dev->dev;
 329         snprintf(smbus->adapter.name, I2C_NAME_SIZE,
 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 = (void *)kmalloc(2*sizeof(struct nforce2_smbus),
 350                                         GFP_KERNEL)))
 351                 return -ENOMEM;
 352         memset (smbuses, 0, 2*sizeof(struct nforce2_smbus));
 353         pci_set_drvdata(dev, smbuses);
 354
 355         /* SMBus adapter 1 */
 356         res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
 357         if (res1 < 0) {
 358                 dev_err(&dev->dev, "Error probing SMB1.\n");
 359                 smbuses[0].base = 0;    /* to have a check value */
 360         }
 361         res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
 362         if (res2 < 0) {
 363                 dev_err(&dev->dev, "Error probing SMB2.\n");
 364                 smbuses[1].base = 0;    /* to have a check value */
 365         }
 366         if ((res1 < 0) && (res2 < 0)) {
 367                 /* we did not find even one of the SMBuses, so we give up */
 368                 kfree(smbuses);
 369                 return -ENODEV;
 370         }
 371
 372         return 0;
 373 }
 374
 375
 376 static void __devexit nforce2_remove(struct pci_dev *dev)
 377 {
 378         struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
 379
 380         if (smbuses[0].base) {
 381                 i2c_del_adapter(&smbuses[0].adapter);
 382                 release_region(smbuses[0].base, smbuses[0].size);
 383         }
 384         if (smbuses[1].base) {
 385                 i2c_del_adapter(&smbuses[1].adapter);
 386                 release_region(smbuses[1].base, smbuses[1].size);
 387         }
 388         kfree(smbuses);
 389 }
 390
 391 static struct pci_driver nforce2_driver = {
 392         .name           = "nForce2_smbus",
 393         .id_table       = nforce2_ids,
 394         .probe          = nforce2_probe,
 395         .remove         = __devexit_p(nforce2_remove),
 396 };
 397
 398 static int __init nforce2_init(void)
 399 {
 400         return pci_register_driver(&nforce2_driver);
 401 }
 402
 403 static void __exit nforce2_exit(void)
 404 {
 405         pci_unregister_driver(&nforce2_driver);
 406 }
 407
 408 module_init(nforce2_init);
 409 module_exit(nforce2_exit);
 410