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/module.h> 41 #include <linux/pci.h> 42 #include <linux/kernel.h> 43 #include <linux/stddef.h> 44 #include <linux/sched.h> 45 #include <linux/ioport.h> 46 #include <linux/init.h> 47 #include <linux/i2c.h> 48 #include <linux/delay.h> 49 #include <asm/io.h> 50 51 MODULE_LICENSE("GPL"); 52 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@arcor.de>"); 53 MODULE_DESCRIPTION("nForce2 SMBus driver"); 54 55 56 struct nforce2_smbus { 57 struct pci_dev *dev; 58 struct i2c_adapter adapter; 59 int base; 60 int size; 61 }; 62 63 64 /* 65 * nVidia nForce2 SMBus control register definitions 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 bytes */ 80 #define NVIDIA_SMB_ALRM_A (smbus->base + 0x25) /* alarm address */ 81 #define NVIDIA_SMB_ALRM_D (smbus->base + 0x26) /* 2 bytes alarm data */ 82 83 #define NVIDIA_SMB_STS_DONE 0x80 84 #define NVIDIA_SMB_STS_ALRM 0x40 85 #define NVIDIA_SMB_STS_RES 0x20 86 #define NVIDIA_SMB_STS_STATUS 0x1f 87 88 #define NVIDIA_SMB_PRTCL_WRITE 0x00 89 #define NVIDIA_SMB_PRTCL_READ 0x01 90 #define NVIDIA_SMB_PRTCL_QUICK 0x02 91 #define NVIDIA_SMB_PRTCL_BYTE 0x04 92 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06 93 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08 94 #define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a 95 #define NVIDIA_SMB_PRTCL_PROC_CALL 0x0c 96 #define NVIDIA_SMB_PRTCL_BLOCK_PROC_CALL 0x0d 97 #define NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA 0x4a 98 #define NVIDIA_SMB_PRTCL_PEC 0x80 99 100 101 static s32 nforce2_access(struct i2c_adapter *adap, u16 addr, 102 unsigned short flags, char read_write, 103 u8 command, int size, union i2c_smbus_data *data); 104 static u32 nforce2_func(struct i2c_adapter *adapter); 105 106 107 static struct i2c_algorithm smbus_algorithm = { 108 .smbus_xfer = nforce2_access, 109 .functionality = nforce2_func, 110 }; 111 112 static struct i2c_adapter nforce2_adapter = { 113 .owner = THIS_MODULE, 114 .class = I2C_CLASS_HWMON, 115 .algo = &smbus_algorithm, 116 .name = "unset", 117 }; 118 119 /* Return -1 on error. See smbus.h for more information */ 120 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr, 121 unsigned short flags, char read_write, 122 u8 command, int size, union i2c_smbus_data * data) 123 { 124 struct nforce2_smbus *smbus = adap->algo_data; 125 unsigned char protocol, pec, temp; 126 unsigned char len = 0; /* to keep the compiler quiet */ 127 int i; 128 129 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ : 130 NVIDIA_SMB_PRTCL_WRITE; 131 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0; 132 133 switch (size) { 134 135 case I2C_SMBUS_QUICK: 136 protocol |= NVIDIA_SMB_PRTCL_QUICK; 137 read_write = I2C_SMBUS_WRITE; 138 break; 139 140 case I2C_SMBUS_BYTE: 141 if (read_write == I2C_SMBUS_WRITE) 142 outb_p(command, NVIDIA_SMB_CMD); 143 protocol |= NVIDIA_SMB_PRTCL_BYTE; 144 break; 145 146 case I2C_SMBUS_BYTE_DATA: 147 outb_p(command, NVIDIA_SMB_CMD); 148 if (read_write == I2C_SMBUS_WRITE) 149 outb_p(data->byte, NVIDIA_SMB_DATA); 150 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA; 151 break; 152 153 case I2C_SMBUS_WORD_DATA: 154 outb_p(command, NVIDIA_SMB_CMD); 155 if (read_write == I2C_SMBUS_WRITE) { 156 outb_p(data->word, NVIDIA_SMB_DATA); 157 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1); 158 } 159 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec; 160 break; 161 162 case I2C_SMBUS_BLOCK_DATA: 163 outb_p(command, NVIDIA_SMB_CMD); 164 if (read_write == I2C_SMBUS_WRITE) { 165 len = min_t(u8, data->block[0], 32); 166 outb_p(len, NVIDIA_SMB_BCNT); 167 for (i = 0; i < len; i++) 168 outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i); 169 } 170 protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec; 171 break; 172 173 case I2C_SMBUS_I2C_BLOCK_DATA: 174 len = min_t(u8, data->block[0], 32); 175 outb_p(command, NVIDIA_SMB_CMD); 176 outb_p(len, NVIDIA_SMB_BCNT); 177 if (read_write == I2C_SMBUS_WRITE) 178 for (i = 0; i < len; i++) 179 outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i); 180 protocol |= NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA; 181 break; 182 183 case I2C_SMBUS_PROC_CALL: 184 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n"); 185 return -1; 186 187 case I2C_SMBUS_BLOCK_PROC_CALL: 188 dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n"); 189 return -1; 190 191 case I2C_SMBUS_WORD_DATA_PEC: 192 case I2C_SMBUS_BLOCK_DATA_PEC: 193 case I2C_SMBUS_PROC_CALL_PEC: 194 case I2C_SMBUS_BLOCK_PROC_CALL_PEC: 195 dev_err(&adap->dev, "Unexpected software PEC transaction %d\n.", size); 196 return -1; 197 198 default: 199 dev_err(&adap->dev, "Unsupported transaction %d\n", size); 200 return -1; 201 } 202 203 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR); 204 outb_p(protocol, NVIDIA_SMB_PRTCL); 205 206 temp = inb_p(NVIDIA_SMB_STS); 207 208 if (~temp & NVIDIA_SMB_STS_DONE) { 209 udelay(500); 210 temp = inb_p(NVIDIA_SMB_STS); 211 } 212 if (~temp & NVIDIA_SMB_STS_DONE) { 213 msleep(10); 214 temp = inb_p(NVIDIA_SMB_STS); 215 } 216 217 if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) { 218 dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp); 219 return -1; 220 } 221 222 if (read_write == I2C_SMBUS_WRITE) 223 return 0; 224 225 switch (size) { 226 227 case I2C_SMBUS_BYTE: 228 case I2C_SMBUS_BYTE_DATA: 229 data->byte = inb_p(NVIDIA_SMB_DATA); 230 break; 231 232 case I2C_SMBUS_WORD_DATA: 233 /* case I2C_SMBUS_PROC_CALL: not supported */ 234 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8); 235 break; 236 237 case I2C_SMBUS_BLOCK_DATA: 238 /* case I2C_SMBUS_BLOCK_PROC_CALL: not supported */ 239 len = inb_p(NVIDIA_SMB_BCNT); 240 len = min_t(u8, len, 32); 241 case I2C_SMBUS_I2C_BLOCK_DATA: 242 for (i = 0; i < len; i++) 243 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i); 244 data->block[0] = len; 245 break; 246 } 247 248 return 0; 249 } 250 251 252 static u32 nforce2_func(struct i2c_adapter *adapter) 253 { 254 /* other functionality might be possible, but is not tested */ 255 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | 256 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA /* | 257 I2C_FUNC_SMBUS_BLOCK_DATA */; 258 } 259 260 261 static struct pci_device_id nforce2_ids[] = { 262 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) }, 263 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) }, 264 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) }, 265 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) }, 266 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) }, 267 { 0 } 268 }; 269 270 271 MODULE_DEVICE_TABLE (pci, nforce2_ids); 272 273 274 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int reg, 275 struct nforce2_smbus *smbus, char *name) 276 { 277 u16 iobase; 278 int error; 279 280 if (pci_read_config_word(dev, reg, &iobase) != PCIBIOS_SUCCESSFUL) { 281 dev_err(&smbus->adapter.dev, "Error reading PCI config for %s\n", name); 282 return -1; 283 } 284 smbus->dev = dev; 285 smbus->base = iobase & 0xfffc; 286 smbus->size = 8; 287 288 if (!request_region(smbus->base, smbus->size, "nForce2 SMBus")) { 289 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n", 290 smbus->base, smbus->base+smbus->size-1, name); 291 return -1; 292 } 293 smbus->adapter = nforce2_adapter; 294 smbus->adapter.algo_data = smbus; 295 smbus->adapter.dev.parent = &dev->dev; 296 snprintf(smbus->adapter.name, I2C_NAME_SIZE, 297 "SMBus nForce2 adapter at %04x", smbus->base); 298 299 error = i2c_add_adapter(&smbus->adapter); 300 if (error) { 301 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n"); 302 release_region(smbus->base, smbus->size); 303 return -1; 304 } 305 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base); 306 return 0; 307 } 308 309 310 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id) 311 { 312 struct nforce2_smbus *smbuses; 313 int res1, res2; 314 315 /* we support 2 SMBus adapters */ 316 if (!(smbuses = (void *)kmalloc(2*sizeof(struct nforce2_smbus), 317 GFP_KERNEL))) 318 return -ENOMEM; 319 memset (smbuses, 0, 2*sizeof(struct nforce2_smbus)); 320 pci_set_drvdata(dev, smbuses); 321 322 /* SMBus adapter 1 */ 323 res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1"); 324 if (res1 < 0) { 325 dev_err(&dev->dev, "Error probing SMB1.\n"); 326 smbuses[0].base = 0; /* to have a check value */ 327 } 328 res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2"); 329 if (res2 < 0) { 330 dev_err(&dev->dev, "Error probing SMB2.\n"); 331 smbuses[1].base = 0; /* to have a check value */ 332 } 333 if ((res1 < 0) && (res2 < 0)) { 334 /* we did not find even one of the SMBuses, so we give up */ 335 kfree(smbuses); 336 return -ENODEV; 337 } 338 339 return 0; 340 } 341 342 343 static void __devexit nforce2_remove(struct pci_dev *dev) 344 { 345 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev); 346 347 if (smbuses[0].base) { 348 i2c_del_adapter(&smbuses[0].adapter); 349 release_region(smbuses[0].base, smbuses[0].size); 350 } 351 if (smbuses[1].base) { 352 i2c_del_adapter(&smbuses[1].adapter); 353 release_region(smbuses[1].base, smbuses[1].size); 354 } 355 kfree(smbuses); 356 } 357 358 static struct pci_driver nforce2_driver = { 359 .name = "nForce2_smbus", 360 .id_table = nforce2_ids, 361 .probe = nforce2_probe, 362 .remove = __devexit_p(nforce2_remove), 363 }; 364 365 static int __init nforce2_init(void) 366 { 367 return pci_register_driver(&nforce2_driver); 368 } 369 370 static void __exit nforce2_exit(void) 371 { 372 pci_unregister_driver(&nforce2_driver); 373 } 374 375 module_init(nforce2_init); 376 module_exit(nforce2_exit); 377 378