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
  35     This driver supports the 2 SMBuses that are included in the MCP of the
  36     nForce2/3/4 chipsets.
  37 */
  38
  39 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
  40
  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 static struct pci_driver nforce2_driver;
 102
 103 static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
 104                        unsigned short flags, char read_write,
 105                        u8 command, int size, union i2c_smbus_data *data);
 106 static u32 nforce2_func(struct i2c_adapter *adapter);
 107
 108
 109 static struct i2c_algorithm smbus_algorithm = {
 110         .smbus_xfer = nforce2_access,
 111         .functionality = nforce2_func,
 112 };
 113
 114 static struct i2c_adapter nforce2_adapter = {
 115         .owner          = THIS_MODULE,
 116         .class          = I2C_CLASS_HWMON,
 117         .algo           = &smbus_algorithm,
 118 };
 119
 120 /* Return -1 on error. See smbus.h for more information */
 121 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
 122                 unsigned short flags, char read_write,
 123                 u8 command, int size, union i2c_smbus_data * data)
 124 {
 125         struct nforce2_smbus *smbus = adap->algo_data;
 126         unsigned char protocol, pec, temp;
 127         unsigned char len = 0; /* to keep the compiler quiet */
 128         int i;
 129
 130         protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
 131                 NVIDIA_SMB_PRTCL_WRITE;
 132         pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
 133
 134         switch (size) {
 135
 136                 case I2C_SMBUS_QUICK:
 137                         protocol |= NVIDIA_SMB_PRTCL_QUICK;
 138                         read_write = I2C_SMBUS_WRITE;
 139                         break;
 140
 141                 case I2C_SMBUS_BYTE:
 142                         if (read_write == I2C_SMBUS_WRITE)
 143                                 outb_p(command, NVIDIA_SMB_CMD);
 144                         protocol |= NVIDIA_SMB_PRTCL_BYTE;
 145                         break;
 146
 147                 case I2C_SMBUS_BYTE_DATA:
 148                         outb_p(command, NVIDIA_SMB_CMD);
 149                         if (read_write == I2C_SMBUS_WRITE)
 150                                 outb_p(data->byte, NVIDIA_SMB_DATA);
 151                         protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
 152                         break;
 153
 154                 case I2C_SMBUS_WORD_DATA:
 155                         outb_p(command, NVIDIA_SMB_CMD);
 156                         if (read_write == I2C_SMBUS_WRITE) {
 157                                  outb_p(data->word, NVIDIA_SMB_DATA);
 158                                  outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
 159                         }
 160                         protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
 161                         break;
 162
 163                 case I2C_SMBUS_BLOCK_DATA:
 164                         outb_p(command, NVIDIA_SMB_CMD);
 165                         if (read_write == I2C_SMBUS_WRITE) {
 166                                 len = min_t(u8, data->block[0], 32);
 167                                 outb_p(len, NVIDIA_SMB_BCNT);
 168                                 for (i = 0; i < len; i++)
 169                                         outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
 170                         }
 171                         protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
 172                         break;
 173
 174                 case I2C_SMBUS_I2C_BLOCK_DATA:
 175                         len = min_t(u8, data->block[0], 32);
 176                         outb_p(command, NVIDIA_SMB_CMD);
 177                         outb_p(len, NVIDIA_SMB_BCNT);
 178                         if (read_write == I2C_SMBUS_WRITE)
 179                                 for (i = 0; i < len; i++)
 180                                         outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
 181                         protocol |= NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA;
 182                         break;
 183
 184                 case I2C_SMBUS_PROC_CALL:
 185                         dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
 186                         return -1;
 187
 188                 case I2C_SMBUS_BLOCK_PROC_CALL:
 189                         dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n");
 190                         return -1;
 191
 192                 default:
 193                         dev_err(&adap->dev, "Unsupported transaction %d\n", size);
 194                         return -1;
 195         }
 196
 197         outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
 198         outb_p(protocol, NVIDIA_SMB_PRTCL);
 199
 200         temp = inb_p(NVIDIA_SMB_STS);
 201
 202         if (~temp & NVIDIA_SMB_STS_DONE) {
 203                 udelay(500);
 204                 temp = inb_p(NVIDIA_SMB_STS);
 205         }
 206         if (~temp & NVIDIA_SMB_STS_DONE) {
 207                 msleep(10);
 208                 temp = inb_p(NVIDIA_SMB_STS);
 209         }
 210
 211         if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
 212                 dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp);
 213                 return -1;
 214         }
 215
 216         if (read_write == I2C_SMBUS_WRITE)
 217                 return 0;
 218
 219         switch (size) {
 220
 221                 case I2C_SMBUS_BYTE:
 222                 case I2C_SMBUS_BYTE_DATA:
 223                         data->byte = inb_p(NVIDIA_SMB_DATA);
 224                         break;
 225
 226                 case I2C_SMBUS_WORD_DATA:
 227                 /* case I2C_SMBUS_PROC_CALL: not supported */
 228                         data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
 229                         break;
 230
 231                 case I2C_SMBUS_BLOCK_DATA:
 232                 /* case I2C_SMBUS_BLOCK_PROC_CALL: not supported */
 233                         len = inb_p(NVIDIA_SMB_BCNT);
 234                         len = min_t(u8, len, 32);
 235                 case I2C_SMBUS_I2C_BLOCK_DATA:
 236                         for (i = 0; i < len; i++)
 237                                 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
 238                         data->block[0] = len;
 239                         break;
 240         }
 241
 242         return 0;
 243 }
 244
 245
 246 static u32 nforce2_func(struct i2c_adapter *adapter)
 247 {
 248         /* other functionality might be possible, but is not tested */
 249         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 250             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA /* |
 251             I2C_FUNC_SMBUS_BLOCK_DATA */;
 252 }
 253
 254
 255 static struct pci_device_id nforce2_ids[] = {
 256         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
 257         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
 258         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
 259         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
 260         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
 261         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
 262         { 0 }
 263 };
 264
 265
 266 MODULE_DEVICE_TABLE (pci, nforce2_ids);
 267
 268
 269 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int reg,
 270         struct nforce2_smbus *smbus, char *name)
 271 {
 272         u16 iobase;
 273         int error;
 274
 275         if (pci_read_config_word(dev, reg, &iobase) != PCIBIOS_SUCCESSFUL) {
 276                 dev_err(&smbus->adapter.dev, "Error reading PCI config for %s\n", name);
 277                 return -1;
 278         }
 279         smbus->dev  = dev;
 280         smbus->base = iobase & 0xfffc;
 281         smbus->size = 8;
 282
 283         if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
 284                 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
 285                         smbus->base, smbus->base+smbus->size-1, name);
 286                 return -1;
 287         }
 288         smbus->adapter = nforce2_adapter;
 289         smbus->adapter.algo_data = smbus;
 290         smbus->adapter.dev.parent = &dev->dev;
 291         snprintf(smbus->adapter.name, I2C_NAME_SIZE,
 292                 "SMBus nForce2 adapter at %04x", smbus->base);
 293
 294         error = i2c_add_adapter(&smbus->adapter);
 295         if (error) {
 296                 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
 297                 release_region(smbus->base, smbus->size);
 298                 return -1;
 299         }
 300         dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
 301         return 0;
 302 }
 303
 304
 305 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
 306 {
 307         struct nforce2_smbus *smbuses;
 308         int res1, res2;
 309
 310         /* we support 2 SMBus adapters */
 311         if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
 312                 return -ENOMEM;
 313         pci_set_drvdata(dev, smbuses);
 314
 315         /* SMBus adapter 1 */
 316         res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
 317         if (res1 < 0) {
 318                 dev_err(&dev->dev, "Error probing SMB1.\n");
 319                 smbuses[0].base = 0;    /* to have a check value */
 320         }
 321         res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
 322         if (res2 < 0) {
 323                 dev_err(&dev->dev, "Error probing SMB2.\n");
 324                 smbuses[1].base = 0;    /* to have a check value */
 325         }
 326         if ((res1 < 0) && (res2 < 0)) {
 327                 /* we did not find even one of the SMBuses, so we give up */
 328                 kfree(smbuses);
 329                 return -ENODEV;
 330         }
 331
 332         return 0;
 333 }
 334
 335
 336 static void __devexit nforce2_remove(struct pci_dev *dev)
 337 {
 338         struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
 339
 340         if (smbuses[0].base) {
 341                 i2c_del_adapter(&smbuses[0].adapter);
 342                 release_region(smbuses[0].base, smbuses[0].size);
 343         }
 344         if (smbuses[1].base) {
 345                 i2c_del_adapter(&smbuses[1].adapter);
 346                 release_region(smbuses[1].base, smbuses[1].size);
 347         }
 348         kfree(smbuses);
 349 }
 350
 351 static struct pci_driver nforce2_driver = {
 352         .name           = "nForce2_smbus",
 353         .id_table       = nforce2_ids,
 354         .probe          = nforce2_probe,
 355         .remove         = __devexit_p(nforce2_remove),
 356 };
 357
 358 static int __init nforce2_init(void)
 359 {
 360         return pci_register_driver(&nforce2_driver);
 361 }
 362
 363 static void __exit nforce2_exit(void)
 364 {
 365         pci_unregister_driver(&nforce2_driver);
 366 }
 367
 368 module_init(nforce2_init);
 369 module_exit(nforce2_exit);
 370