1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 SMBus driver for nVidia nForce2 MCP 4 5 Added nForce3 Pro 150 Thomas Leibold <thomas@plx.com>, 6 Ported to 2.5 Patrick Dreker <patrick@dreker.de>, 7 Copyright (c) 2003 Hans-Frieder Vogt <hfvogt@arcor.de>, 8 Based on 9 SMBus 2.0 driver for AMD-8111 IO-Hub 10 Copyright (c) 2002 Vojtech Pavlik 11 12 */ 13 14 /* 15 SUPPORTED DEVICES PCI ID 16 nForce2 MCP 0064 17 nForce2 Ultra 400 MCP 0084 18 nForce3 Pro150 MCP 00D4 19 nForce3 250Gb MCP 00E4 20 nForce4 MCP 0052 21 nForce4 MCP-04 0034 22 nForce MCP51 0264 23 nForce MCP55 0368 24 nForce MCP61 03EB 25 nForce MCP65 0446 26 nForce MCP67 0542 27 nForce MCP73 07D8 28 nForce MCP78S 0752 29 nForce MCP79 0AA2 30 31 This driver supports the 2 SMBuses that are included in the MCP of the 32 nForce2/3/4/5xx chipsets. 33 */ 34 35 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */ 36 37 #include <linux/module.h> 38 #include <linux/pci.h> 39 #include <linux/kernel.h> 40 #include <linux/stddef.h> 41 #include <linux/ioport.h> 42 #include <linux/i2c.h> 43 #include <linux/delay.h> 44 #include <linux/dmi.h> 45 #include <linux/acpi.h> 46 #include <linux/slab.h> 47 #include <linux/io.h> 48 49 MODULE_LICENSE("GPL"); 50 MODULE_AUTHOR("Hans-Frieder Vogt <hfvogt@gmx.net>"); 51 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver"); 52 53 54 struct nforce2_smbus { 55 struct i2c_adapter adapter; 56 int base; 57 int size; 58 int blockops; 59 int can_abort; 60 }; 61 62 63 /* 64 * nVidia nForce2 SMBus control register definitions 65 * (Newer incarnations use standard BARs 4 and 5 instead) 66 */ 67 #define NFORCE_PCI_SMB1 0x50 68 #define NFORCE_PCI_SMB2 0x54 69 70 71 /* 72 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model 73 */ 74 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */ 75 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */ 76 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */ 77 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */ 78 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */ 79 #define NVIDIA_SMB_BCNT (smbus->base + 0x24) /* number of data 80 bytes */ 81 #define NVIDIA_SMB_STATUS_ABRT (smbus->base + 0x3c) /* register used to 82 check the status of 83 the abort command */ 84 #define NVIDIA_SMB_CTRL (smbus->base + 0x3e) /* control register */ 85 86 #define NVIDIA_SMB_STATUS_ABRT_STS 0x01 /* Bit to notify that 87 abort succeeded */ 88 #define NVIDIA_SMB_CTRL_ABORT 0x20 89 #define NVIDIA_SMB_STS_DONE 0x80 90 #define NVIDIA_SMB_STS_ALRM 0x40 91 #define NVIDIA_SMB_STS_RES 0x20 92 #define NVIDIA_SMB_STS_STATUS 0x1f 93 94 #define NVIDIA_SMB_PRTCL_WRITE 0x00 95 #define NVIDIA_SMB_PRTCL_READ 0x01 96 #define NVIDIA_SMB_PRTCL_QUICK 0x02 97 #define NVIDIA_SMB_PRTCL_BYTE 0x04 98 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06 99 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08 100 #define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a 101 #define NVIDIA_SMB_PRTCL_PEC 0x80 102 103 /* Misc definitions */ 104 #define MAX_TIMEOUT 100 105 106 /* We disable the second SMBus channel on these boards */ 107 static const struct dmi_system_id nforce2_dmi_blacklist2[] = { 108 { 109 .ident = "DFI Lanparty NF4 Expert", 110 .matches = { 111 DMI_MATCH(DMI_BOARD_VENDOR, "DFI Corp,LTD"), 112 DMI_MATCH(DMI_BOARD_NAME, "LP UT NF4 Expert"), 113 }, 114 }, 115 { } 116 }; 117 118 static struct pci_driver nforce2_driver; 119 120 /* For multiplexing support, we need a global reference to the 1st 121 SMBus channel */ 122 #if IS_ENABLED(CONFIG_I2C_NFORCE2_S4985) 123 struct i2c_adapter *nforce2_smbus; 124 EXPORT_SYMBOL_GPL(nforce2_smbus); 125 126 static void nforce2_set_reference(struct i2c_adapter *adap) 127 { 128 nforce2_smbus = adap; 129 } 130 #else 131 static inline void nforce2_set_reference(struct i2c_adapter *adap) { } 132 #endif 133 134 static void nforce2_abort(struct i2c_adapter *adap) 135 { 136 struct nforce2_smbus *smbus = adap->algo_data; 137 int timeout = 0; 138 unsigned char temp; 139 140 dev_dbg(&adap->dev, "Aborting current transaction\n"); 141 142 outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL); 143 do { 144 msleep(1); 145 temp = inb_p(NVIDIA_SMB_STATUS_ABRT); 146 } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) && 147 (timeout++ < MAX_TIMEOUT)); 148 if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS)) 149 dev_err(&adap->dev, "Can't reset the smbus\n"); 150 outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT); 151 } 152 153 static int nforce2_check_status(struct i2c_adapter *adap) 154 { 155 struct nforce2_smbus *smbus = adap->algo_data; 156 int timeout = 0; 157 unsigned char temp; 158 159 do { 160 msleep(1); 161 temp = inb_p(NVIDIA_SMB_STS); 162 } while ((!temp) && (timeout++ < MAX_TIMEOUT)); 163 164 if (timeout > MAX_TIMEOUT) { 165 dev_dbg(&adap->dev, "SMBus Timeout!\n"); 166 if (smbus->can_abort) 167 nforce2_abort(adap); 168 return -ETIMEDOUT; 169 } 170 if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) { 171 dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp); 172 return -EIO; 173 } 174 return 0; 175 } 176 177 /* Return negative errno on error */ 178 static s32 nforce2_access(struct i2c_adapter *adap, u16 addr, 179 unsigned short flags, char read_write, 180 u8 command, int size, union i2c_smbus_data *data) 181 { 182 struct nforce2_smbus *smbus = adap->algo_data; 183 unsigned char protocol, pec; 184 u8 len; 185 int i, status; 186 187 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ : 188 NVIDIA_SMB_PRTCL_WRITE; 189 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0; 190 191 switch (size) { 192 case I2C_SMBUS_QUICK: 193 protocol |= NVIDIA_SMB_PRTCL_QUICK; 194 read_write = I2C_SMBUS_WRITE; 195 break; 196 197 case I2C_SMBUS_BYTE: 198 if (read_write == I2C_SMBUS_WRITE) 199 outb_p(command, NVIDIA_SMB_CMD); 200 protocol |= NVIDIA_SMB_PRTCL_BYTE; 201 break; 202 203 case I2C_SMBUS_BYTE_DATA: 204 outb_p(command, NVIDIA_SMB_CMD); 205 if (read_write == I2C_SMBUS_WRITE) 206 outb_p(data->byte, NVIDIA_SMB_DATA); 207 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA; 208 break; 209 210 case I2C_SMBUS_WORD_DATA: 211 outb_p(command, NVIDIA_SMB_CMD); 212 if (read_write == I2C_SMBUS_WRITE) { 213 outb_p(data->word, NVIDIA_SMB_DATA); 214 outb_p(data->word >> 8, NVIDIA_SMB_DATA + 1); 215 } 216 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec; 217 break; 218 219 case I2C_SMBUS_BLOCK_DATA: 220 outb_p(command, NVIDIA_SMB_CMD); 221 if (read_write == I2C_SMBUS_WRITE) { 222 len = data->block[0]; 223 if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) { 224 dev_err(&adap->dev, 225 "Transaction failed (requested block size: %d)\n", 226 len); 227 return -EINVAL; 228 } 229 outb_p(len, NVIDIA_SMB_BCNT); 230 for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++) 231 outb_p(data->block[i + 1], 232 NVIDIA_SMB_DATA + i); 233 } 234 protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec; 235 break; 236 237 default: 238 dev_err(&adap->dev, "Unsupported transaction %d\n", size); 239 return -EOPNOTSUPP; 240 } 241 242 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR); 243 outb_p(protocol, NVIDIA_SMB_PRTCL); 244 245 status = nforce2_check_status(adap); 246 if (status) 247 return status; 248 249 if (read_write == I2C_SMBUS_WRITE) 250 return 0; 251 252 switch (size) { 253 case I2C_SMBUS_BYTE: 254 case I2C_SMBUS_BYTE_DATA: 255 data->byte = inb_p(NVIDIA_SMB_DATA); 256 break; 257 258 case I2C_SMBUS_WORD_DATA: 259 data->word = inb_p(NVIDIA_SMB_DATA) | 260 (inb_p(NVIDIA_SMB_DATA + 1) << 8); 261 break; 262 263 case I2C_SMBUS_BLOCK_DATA: 264 len = inb_p(NVIDIA_SMB_BCNT); 265 if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) { 266 dev_err(&adap->dev, 267 "Transaction failed (received block size: 0x%02x)\n", 268 len); 269 return -EPROTO; 270 } 271 for (i = 0; i < len; i++) 272 data->block[i + 1] = inb_p(NVIDIA_SMB_DATA + i); 273 data->block[0] = len; 274 break; 275 } 276 277 return 0; 278 } 279 280 281 static u32 nforce2_func(struct i2c_adapter *adapter) 282 { 283 /* other functionality might be possible, but is not tested */ 284 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | 285 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | 286 I2C_FUNC_SMBUS_PEC | 287 (((struct nforce2_smbus *)adapter->algo_data)->blockops ? 288 I2C_FUNC_SMBUS_BLOCK_DATA : 0); 289 } 290 291 static const struct i2c_algorithm smbus_algorithm = { 292 .smbus_xfer = nforce2_access, 293 .functionality = nforce2_func, 294 }; 295 296 297 static const struct pci_device_id nforce2_ids[] = { 298 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) }, 299 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) }, 300 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) }, 301 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) }, 302 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) }, 303 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) }, 304 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) }, 305 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) }, 306 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) }, 307 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) }, 308 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP67_SMBUS) }, 309 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_SMBUS) }, 310 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP78S_SMBUS) }, 311 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP79_SMBUS) }, 312 { 0 } 313 }; 314 315 MODULE_DEVICE_TABLE(pci, nforce2_ids); 316 317 318 static int nforce2_probe_smb(struct pci_dev *dev, int bar, int alt_reg, 319 struct nforce2_smbus *smbus, const char *name) 320 { 321 int error; 322 323 smbus->base = pci_resource_start(dev, bar); 324 if (smbus->base) { 325 smbus->size = pci_resource_len(dev, bar); 326 } else { 327 /* Older incarnations of the device used non-standard BARs */ 328 u16 iobase; 329 330 error = pci_read_config_word(dev, alt_reg, &iobase); 331 if (error != PCIBIOS_SUCCESSFUL) { 332 dev_err(&dev->dev, "Error reading PCI config for %s\n", 333 name); 334 return -EIO; 335 } 336 337 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK; 338 smbus->size = 64; 339 } 340 341 error = acpi_check_region(smbus->base, smbus->size, 342 nforce2_driver.name); 343 if (error) 344 return error; 345 346 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) { 347 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n", 348 smbus->base, smbus->base+smbus->size-1, name); 349 return -EBUSY; 350 } 351 smbus->adapter.owner = THIS_MODULE; 352 smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; 353 smbus->adapter.algo = &smbus_algorithm; 354 smbus->adapter.algo_data = smbus; 355 smbus->adapter.dev.parent = &dev->dev; 356 snprintf(smbus->adapter.name, sizeof(smbus->adapter.name), 357 "SMBus nForce2 adapter at %04x", smbus->base); 358 359 error = i2c_add_adapter(&smbus->adapter); 360 if (error) { 361 release_region(smbus->base, smbus->size); 362 return error; 363 } 364 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", 365 smbus->base); 366 return 0; 367 } 368 369 370 static int nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id) 371 { 372 struct nforce2_smbus *smbuses; 373 int res1, res2; 374 375 /* we support 2 SMBus adapters */ 376 smbuses = kcalloc(2, sizeof(struct nforce2_smbus), GFP_KERNEL); 377 if (!smbuses) 378 return -ENOMEM; 379 pci_set_drvdata(dev, smbuses); 380 381 switch (dev->device) { 382 case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS: 383 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS: 384 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS: 385 smbuses[0].blockops = 1; 386 smbuses[1].blockops = 1; 387 smbuses[0].can_abort = 1; 388 smbuses[1].can_abort = 1; 389 } 390 391 /* SMBus adapter 1 */ 392 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1"); 393 if (res1 < 0) 394 smbuses[0].base = 0; /* to have a check value */ 395 396 /* SMBus adapter 2 */ 397 if (dmi_check_system(nforce2_dmi_blacklist2)) { 398 dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n"); 399 res2 = -EPERM; 400 smbuses[1].base = 0; 401 } else { 402 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1], 403 "SMB2"); 404 if (res2 < 0) 405 smbuses[1].base = 0; /* to have a check value */ 406 } 407 408 if ((res1 < 0) && (res2 < 0)) { 409 /* we did not find even one of the SMBuses, so we give up */ 410 kfree(smbuses); 411 return -ENODEV; 412 } 413 414 nforce2_set_reference(&smbuses[0].adapter); 415 return 0; 416 } 417 418 419 static void nforce2_remove(struct pci_dev *dev) 420 { 421 struct nforce2_smbus *smbuses = pci_get_drvdata(dev); 422 423 nforce2_set_reference(NULL); 424 if (smbuses[0].base) { 425 i2c_del_adapter(&smbuses[0].adapter); 426 release_region(smbuses[0].base, smbuses[0].size); 427 } 428 if (smbuses[1].base) { 429 i2c_del_adapter(&smbuses[1].adapter); 430 release_region(smbuses[1].base, smbuses[1].size); 431 } 432 kfree(smbuses); 433 } 434 435 static struct pci_driver nforce2_driver = { 436 .name = "nForce2_smbus", 437 .id_table = nforce2_ids, 438 .probe = nforce2_probe, 439 .remove = nforce2_remove, 440 }; 441 442 module_pci_driver(nforce2_driver); 443