drivers/i2c/busses/i2c-nforce2.c

   1 /*
   2     SMBus driver for nVidia nForce2 MCP
   3
   4         Ported to 2.5 Patrick Dreker <patrick@dreker.de>,
   5     Copyright (c) 2003  Hans-Frieder Vogt <hfvogt@arcor.de>,
   6     Based on
   7     SMBus 2.0 driver for AMD-8111 IO-Hub
   8     Copyright (c) 2002 Vojtech Pavlik
   9
  10     This program is free software; you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation; either version 2 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License
  21     along with this program; if not, write to the Free Software
  22     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 /*
  26     SUPPORTED DEVICES   PCI ID
  27     nForce2 MCP         0064
  28
  29     This driver supports the 2 SMBuses that are included in the MCP2 of the
  30     nForce2 chipset.
  31 */
  32
  33 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
  34
  35 #include <linux/config.h>
  36 #include <linux/module.h>
  37 #include <linux/pci.h>
  38 #include <linux/kernel.h>
  39 #include <linux/stddef.h>
  40 #include <linux/sched.h>
  41 #include <linux/ioport.h>
  42 #include <linux/init.h>
  43 #include <linux/i2c.h>
  44 #include <linux/delay.h>
  45 #include <asm/io.h>
  46
  47 MODULE_LICENSE("GPL");
  48 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@arcor.de>");
  49 MODULE_DESCRIPTION("nForce2 SMBus driver");
  50
  51
  52 #ifndef PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS
  53 #define PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS   0x0064
  54 #endif
  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_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS,
 296                 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 297         { 0 }
 298 };
 299
 300
 301 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int reg,
 302         struct nforce2_smbus *smbus, char *name)
 303 {
 304         u16 iobase;
 305         int error;
 306
 307         if (pci_read_config_word(dev, reg, &iobase) != PCIBIOS_SUCCESSFUL) {
 308                 dev_err(&smbus->adapter.dev, "Error reading PCI config for %s\n", name);
 309                 return -1;
 310         }
 311         smbus->dev  = dev;
 312         smbus->base = iobase & 0xfffc;
 313         smbus->size = 8;
 314
 315         if (!request_region(smbus->base, smbus->size, "nForce2 SMBus")) {
 316                 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
 317                         smbus->base, smbus->base+smbus->size-1, name);
 318                 return -1;
 319         }
 320         smbus->adapter = nforce2_adapter;
 321         smbus->adapter.algo_data = smbus;
 322         smbus->adapter.dev.parent = &dev->dev;
 323         snprintf(smbus->adapter.name, I2C_NAME_SIZE,
 324                 "SMBus nForce2 adapter at %04x", smbus->base);
 325
 326         error = i2c_add_adapter(&smbus->adapter);
 327         if (error) {
 328                 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
 329                 release_region(smbus->base, smbus->size);
 330                 return -1;
 331         }
 332         dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
 333         return 0;
 334 }
 335
 336
 337 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
 338 {
 339         struct nforce2_smbus *smbuses;
 340         int res1, res2;
 341
 342         /* we support 2 SMBus adapters */
 343         if (!(smbuses = (void *)kmalloc(2*sizeof(struct nforce2_smbus),
 344                                         GFP_KERNEL)))
 345                 return -ENOMEM;
 346         memset (smbuses, 0, 2*sizeof(struct nforce2_smbus));
 347         pci_set_drvdata(dev, smbuses);
 348
 349         /* SMBus adapter 1 */
 350         res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
 351         if (res1 < 0) {
 352                 dev_err(&dev->dev, "Error probing SMB1.\n");
 353                 smbuses[0].base = 0;    /* to have a check value */
 354         }
 355         res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
 356         if (res2 < 0) {
 357                 dev_err(&dev->dev, "Error probing SMB2.\n");
 358                 smbuses[1].base = 0;    /* to have a check value */
 359         }
 360         if ((res1 < 0) && (res2 < 0)) {
 361                 /* we did not find even one of the SMBuses, so we give up */
 362                 kfree(smbuses);
 363                 return -ENODEV;
 364         }
 365
 366         return 0;
 367 }
 368
 369
 370 static void __devexit nforce2_remove(struct pci_dev *dev)
 371 {
 372         struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
 373
 374         if (smbuses[0].base) {
 375                 i2c_del_adapter(&smbuses[0].adapter);
 376                 release_region(smbuses[0].base, smbuses[0].size);
 377         }
 378         if (smbuses[1].base) {
 379                 i2c_del_adapter(&smbuses[1].adapter);
 380                 release_region(smbuses[1].base, smbuses[1].size);
 381         }
 382         kfree(smbuses);
 383 }
 384
 385 static struct pci_driver nforce2_driver = {
 386         .name           = "nForce2_smbus",
 387         .id_table       = nforce2_ids,
 388         .probe          = nforce2_probe,
 389         .remove         = __devexit_p(nforce2_remove),
 390 };
 391
 392 static int __init nforce2_init(void)
 393 {
 394         return pci_module_init(&nforce2_driver);
 395 }
 396
 397 static void __exit nforce2_exit(void)
 398 {
 399         pci_unregister_driver(&nforce2_driver);
 400 }
 401
 402 module_init(nforce2_init);
 403 module_exit(nforce2_exit);
 404