Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jean Delvare | d6072f8 | 2005-09-25 16:37:04 +0200 | [diff] [blame] | 100 | static struct pci_driver nforce2_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | static s32 nforce2_access(struct i2c_adapter *adap, u16 addr, |
| 103 | unsigned short flags, char read_write, |
| 104 | u8 command, int size, union i2c_smbus_data *data); |
| 105 | static u32 nforce2_func(struct i2c_adapter *adapter); |
| 106 | |
| 107 | |
| 108 | static struct i2c_algorithm smbus_algorithm = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | .smbus_xfer = nforce2_access, |
| 110 | .functionality = nforce2_func, |
| 111 | }; |
| 112 | |
| 113 | static struct i2c_adapter nforce2_adapter = { |
| 114 | .owner = THIS_MODULE, |
| 115 | .class = I2C_CLASS_HWMON, |
| 116 | .algo = &smbus_algorithm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
| 187 | case I2C_SMBUS_BLOCK_PROC_CALL: |
| 188 | dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n"); |
| 189 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Hans-Frieder Vogt | 5033017 | 2005-07-23 15:33:39 +0200 | [diff] [blame] | 217 | if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) { |
| 218 | dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | return -1; |
Hans-Frieder Vogt | 5033017 | 2005-07-23 15:33:39 +0200 | [diff] [blame] | 220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jean Delvare | d6072f8 | 2005-09-25 16:37:04 +0200 | [diff] [blame] | 288 | if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Jean Delvare | 078d9fe | 2005-10-17 23:12:36 +0200 | [diff] [blame^] | 316 | if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | pci_set_drvdata(dev, smbuses); |
| 319 | |
| 320 | /* SMBus adapter 1 */ |
| 321 | res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1"); |
| 322 | if (res1 < 0) { |
| 323 | dev_err(&dev->dev, "Error probing SMB1.\n"); |
| 324 | smbuses[0].base = 0; /* to have a check value */ |
| 325 | } |
| 326 | res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2"); |
| 327 | if (res2 < 0) { |
| 328 | dev_err(&dev->dev, "Error probing SMB2.\n"); |
| 329 | smbuses[1].base = 0; /* to have a check value */ |
| 330 | } |
| 331 | if ((res1 < 0) && (res2 < 0)) { |
| 332 | /* we did not find even one of the SMBuses, so we give up */ |
| 333 | kfree(smbuses); |
| 334 | return -ENODEV; |
| 335 | } |
| 336 | |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | |
| 341 | static void __devexit nforce2_remove(struct pci_dev *dev) |
| 342 | { |
| 343 | struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev); |
| 344 | |
| 345 | if (smbuses[0].base) { |
| 346 | i2c_del_adapter(&smbuses[0].adapter); |
| 347 | release_region(smbuses[0].base, smbuses[0].size); |
| 348 | } |
| 349 | if (smbuses[1].base) { |
| 350 | i2c_del_adapter(&smbuses[1].adapter); |
| 351 | release_region(smbuses[1].base, smbuses[1].size); |
| 352 | } |
| 353 | kfree(smbuses); |
| 354 | } |
| 355 | |
| 356 | static struct pci_driver nforce2_driver = { |
Laurent Riffard | ccd7aa0 | 2005-10-17 22:47:48 +0200 | [diff] [blame] | 357 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | .name = "nForce2_smbus", |
| 359 | .id_table = nforce2_ids, |
| 360 | .probe = nforce2_probe, |
| 361 | .remove = __devexit_p(nforce2_remove), |
| 362 | }; |
| 363 | |
| 364 | static int __init nforce2_init(void) |
| 365 | { |
| 366 | return pci_register_driver(&nforce2_driver); |
| 367 | } |
| 368 | |
| 369 | static void __exit nforce2_exit(void) |
| 370 | { |
| 371 | pci_unregister_driver(&nforce2_driver); |
| 372 | } |
| 373 | |
| 374 | module_init(nforce2_init); |
| 375 | module_exit(nforce2_exit); |
| 376 | |