1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * A driver for the Integrated Circuits ICS932S401 4 * Copyright (C) 2008 IBM 5 * 6 * Author: Darrick J. Wong <darrick.wong@oracle.com> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/jiffies.h> 11 #include <linux/i2c.h> 12 #include <linux/err.h> 13 #include <linux/mutex.h> 14 #include <linux/delay.h> 15 #include <linux/log2.h> 16 #include <linux/slab.h> 17 18 /* Addresses to scan */ 19 static const unsigned short normal_i2c[] = { 0x69, I2C_CLIENT_END }; 20 21 /* ICS932S401 registers */ 22 #define ICS932S401_REG_CFG2 0x01 23 #define ICS932S401_CFG1_SPREAD 0x01 24 #define ICS932S401_REG_CFG7 0x06 25 #define ICS932S401_FS_MASK 0x07 26 #define ICS932S401_REG_VENDOR_REV 0x07 27 #define ICS932S401_VENDOR 1 28 #define ICS932S401_VENDOR_MASK 0x0F 29 #define ICS932S401_REV 4 30 #define ICS932S401_REV_SHIFT 4 31 #define ICS932S401_REG_DEVICE 0x09 32 #define ICS932S401_DEVICE 11 33 #define ICS932S401_REG_CTRL 0x0A 34 #define ICS932S401_MN_ENABLED 0x80 35 #define ICS932S401_CPU_ALT 0x04 36 #define ICS932S401_SRC_ALT 0x08 37 #define ICS932S401_REG_CPU_M_CTRL 0x0B 38 #define ICS932S401_M_MASK 0x3F 39 #define ICS932S401_REG_CPU_N_CTRL 0x0C 40 #define ICS932S401_REG_CPU_SPREAD1 0x0D 41 #define ICS932S401_REG_CPU_SPREAD2 0x0E 42 #define ICS932S401_SPREAD_MASK 0x7FFF 43 #define ICS932S401_REG_SRC_M_CTRL 0x0F 44 #define ICS932S401_REG_SRC_N_CTRL 0x10 45 #define ICS932S401_REG_SRC_SPREAD1 0x11 46 #define ICS932S401_REG_SRC_SPREAD2 0x12 47 #define ICS932S401_REG_CPU_DIVISOR 0x13 48 #define ICS932S401_CPU_DIVISOR_SHIFT 4 49 #define ICS932S401_REG_PCISRC_DIVISOR 0x14 50 #define ICS932S401_SRC_DIVISOR_MASK 0x0F 51 #define ICS932S401_PCI_DIVISOR_SHIFT 4 52 53 /* Base clock is 14.318MHz */ 54 #define BASE_CLOCK 14318 55 56 #define NUM_REGS 21 57 #define NUM_MIRRORED_REGS 15 58 59 static int regs_to_copy[NUM_MIRRORED_REGS] = { 60 ICS932S401_REG_CFG2, 61 ICS932S401_REG_CFG7, 62 ICS932S401_REG_VENDOR_REV, 63 ICS932S401_REG_DEVICE, 64 ICS932S401_REG_CTRL, 65 ICS932S401_REG_CPU_M_CTRL, 66 ICS932S401_REG_CPU_N_CTRL, 67 ICS932S401_REG_CPU_SPREAD1, 68 ICS932S401_REG_CPU_SPREAD2, 69 ICS932S401_REG_SRC_M_CTRL, 70 ICS932S401_REG_SRC_N_CTRL, 71 ICS932S401_REG_SRC_SPREAD1, 72 ICS932S401_REG_SRC_SPREAD2, 73 ICS932S401_REG_CPU_DIVISOR, 74 ICS932S401_REG_PCISRC_DIVISOR, 75 }; 76 77 /* How often do we reread sensors values? (In jiffies) */ 78 #define SENSOR_REFRESH_INTERVAL (2 * HZ) 79 80 /* How often do we reread sensor limit values? (In jiffies) */ 81 #define LIMIT_REFRESH_INTERVAL (60 * HZ) 82 83 struct ics932s401_data { 84 struct attribute_group attrs; 85 struct mutex lock; 86 char sensors_valid; 87 unsigned long sensors_last_updated; /* In jiffies */ 88 89 u8 regs[NUM_REGS]; 90 }; 91 92 static int ics932s401_probe(struct i2c_client *client, 93 const struct i2c_device_id *id); 94 static int ics932s401_detect(struct i2c_client *client, 95 struct i2c_board_info *info); 96 static int ics932s401_remove(struct i2c_client *client); 97 98 static const struct i2c_device_id ics932s401_id[] = { 99 { "ics932s401", 0 }, 100 { } 101 }; 102 MODULE_DEVICE_TABLE(i2c, ics932s401_id); 103 104 static struct i2c_driver ics932s401_driver = { 105 .class = I2C_CLASS_HWMON, 106 .driver = { 107 .name = "ics932s401", 108 }, 109 .probe = ics932s401_probe, 110 .remove = ics932s401_remove, 111 .id_table = ics932s401_id, 112 .detect = ics932s401_detect, 113 .address_list = normal_i2c, 114 }; 115 116 static struct ics932s401_data *ics932s401_update_device(struct device *dev) 117 { 118 struct i2c_client *client = to_i2c_client(dev); 119 struct ics932s401_data *data = i2c_get_clientdata(client); 120 unsigned long local_jiffies = jiffies; 121 int i, temp; 122 123 mutex_lock(&data->lock); 124 if (time_before(local_jiffies, data->sensors_last_updated + 125 SENSOR_REFRESH_INTERVAL) 126 && data->sensors_valid) 127 goto out; 128 129 /* 130 * Each register must be read as a word and then right shifted 8 bits. 131 * Not really sure why this is; setting the "byte count programming" 132 * register to 1 does not fix this problem. 133 */ 134 for (i = 0; i < NUM_MIRRORED_REGS; i++) { 135 temp = i2c_smbus_read_word_data(client, regs_to_copy[i]); 136 if (temp < 0) 137 temp = 0; 138 data->regs[regs_to_copy[i]] = temp >> 8; 139 } 140 141 data->sensors_last_updated = local_jiffies; 142 data->sensors_valid = 1; 143 144 out: 145 mutex_unlock(&data->lock); 146 return data; 147 } 148 149 static ssize_t show_spread_enabled(struct device *dev, 150 struct device_attribute *devattr, 151 char *buf) 152 { 153 struct ics932s401_data *data = ics932s401_update_device(dev); 154 155 if (data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD) 156 return sprintf(buf, "1\n"); 157 158 return sprintf(buf, "0\n"); 159 } 160 161 /* bit to cpu khz map */ 162 static const int fs_speeds[] = { 163 266666, 164 133333, 165 200000, 166 166666, 167 333333, 168 100000, 169 400000, 170 0, 171 }; 172 173 /* clock divisor map */ 174 static const int divisors[] = {2, 3, 5, 15, 4, 6, 10, 30, 8, 12, 20, 60, 16, 175 24, 40, 120}; 176 177 /* Calculate CPU frequency from the M/N registers. */ 178 static int calculate_cpu_freq(struct ics932s401_data *data) 179 { 180 int m, n, freq; 181 182 m = data->regs[ICS932S401_REG_CPU_M_CTRL] & ICS932S401_M_MASK; 183 n = data->regs[ICS932S401_REG_CPU_N_CTRL]; 184 185 /* Pull in bits 8 & 9 from the M register */ 186 n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x80) << 1; 187 n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x40) << 3; 188 189 freq = BASE_CLOCK * (n + 8) / (m + 2); 190 freq /= divisors[data->regs[ICS932S401_REG_CPU_DIVISOR] >> 191 ICS932S401_CPU_DIVISOR_SHIFT]; 192 193 return freq; 194 } 195 196 static ssize_t show_cpu_clock(struct device *dev, 197 struct device_attribute *devattr, 198 char *buf) 199 { 200 struct ics932s401_data *data = ics932s401_update_device(dev); 201 202 return sprintf(buf, "%d\n", calculate_cpu_freq(data)); 203 } 204 205 static ssize_t show_cpu_clock_sel(struct device *dev, 206 struct device_attribute *devattr, 207 char *buf) 208 { 209 struct ics932s401_data *data = ics932s401_update_device(dev); 210 int freq; 211 212 if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED) 213 freq = calculate_cpu_freq(data); 214 else { 215 /* Freq is neatly wrapped up for us */ 216 int fid = data->regs[ICS932S401_REG_CFG7] & ICS932S401_FS_MASK; 217 218 freq = fs_speeds[fid]; 219 if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT) { 220 switch (freq) { 221 case 166666: 222 freq = 160000; 223 break; 224 case 333333: 225 freq = 320000; 226 break; 227 } 228 } 229 } 230 231 return sprintf(buf, "%d\n", freq); 232 } 233 234 /* Calculate SRC frequency from the M/N registers. */ 235 static int calculate_src_freq(struct ics932s401_data *data) 236 { 237 int m, n, freq; 238 239 m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK; 240 n = data->regs[ICS932S401_REG_SRC_N_CTRL]; 241 242 /* Pull in bits 8 & 9 from the M register */ 243 n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1; 244 n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3; 245 246 freq = BASE_CLOCK * (n + 8) / (m + 2); 247 freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] & 248 ICS932S401_SRC_DIVISOR_MASK]; 249 250 return freq; 251 } 252 253 static ssize_t show_src_clock(struct device *dev, 254 struct device_attribute *devattr, 255 char *buf) 256 { 257 struct ics932s401_data *data = ics932s401_update_device(dev); 258 259 return sprintf(buf, "%d\n", calculate_src_freq(data)); 260 } 261 262 static ssize_t show_src_clock_sel(struct device *dev, 263 struct device_attribute *devattr, 264 char *buf) 265 { 266 struct ics932s401_data *data = ics932s401_update_device(dev); 267 int freq; 268 269 if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED) 270 freq = calculate_src_freq(data); 271 else 272 /* Freq is neatly wrapped up for us */ 273 if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT && 274 data->regs[ICS932S401_REG_CTRL] & ICS932S401_SRC_ALT) 275 freq = 96000; 276 else 277 freq = 100000; 278 279 return sprintf(buf, "%d\n", freq); 280 } 281 282 /* Calculate PCI frequency from the SRC M/N registers. */ 283 static int calculate_pci_freq(struct ics932s401_data *data) 284 { 285 int m, n, freq; 286 287 m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK; 288 n = data->regs[ICS932S401_REG_SRC_N_CTRL]; 289 290 /* Pull in bits 8 & 9 from the M register */ 291 n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1; 292 n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3; 293 294 freq = BASE_CLOCK * (n + 8) / (m + 2); 295 freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] >> 296 ICS932S401_PCI_DIVISOR_SHIFT]; 297 298 return freq; 299 } 300 301 static ssize_t show_pci_clock(struct device *dev, 302 struct device_attribute *devattr, 303 char *buf) 304 { 305 struct ics932s401_data *data = ics932s401_update_device(dev); 306 307 return sprintf(buf, "%d\n", calculate_pci_freq(data)); 308 } 309 310 static ssize_t show_pci_clock_sel(struct device *dev, 311 struct device_attribute *devattr, 312 char *buf) 313 { 314 struct ics932s401_data *data = ics932s401_update_device(dev); 315 int freq; 316 317 if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED) 318 freq = calculate_pci_freq(data); 319 else 320 freq = 33333; 321 322 return sprintf(buf, "%d\n", freq); 323 } 324 325 static ssize_t show_value(struct device *dev, 326 struct device_attribute *devattr, 327 char *buf); 328 329 static ssize_t show_spread(struct device *dev, 330 struct device_attribute *devattr, 331 char *buf); 332 333 static DEVICE_ATTR(spread_enabled, S_IRUGO, show_spread_enabled, NULL); 334 static DEVICE_ATTR(cpu_clock_selection, S_IRUGO, show_cpu_clock_sel, NULL); 335 static DEVICE_ATTR(cpu_clock, S_IRUGO, show_cpu_clock, NULL); 336 static DEVICE_ATTR(src_clock_selection, S_IRUGO, show_src_clock_sel, NULL); 337 static DEVICE_ATTR(src_clock, S_IRUGO, show_src_clock, NULL); 338 static DEVICE_ATTR(pci_clock_selection, S_IRUGO, show_pci_clock_sel, NULL); 339 static DEVICE_ATTR(pci_clock, S_IRUGO, show_pci_clock, NULL); 340 static DEVICE_ATTR(usb_clock, S_IRUGO, show_value, NULL); 341 static DEVICE_ATTR(ref_clock, S_IRUGO, show_value, NULL); 342 static DEVICE_ATTR(cpu_spread, S_IRUGO, show_spread, NULL); 343 static DEVICE_ATTR(src_spread, S_IRUGO, show_spread, NULL); 344 345 static struct attribute *ics932s401_attr[] = { 346 &dev_attr_spread_enabled.attr, 347 &dev_attr_cpu_clock_selection.attr, 348 &dev_attr_cpu_clock.attr, 349 &dev_attr_src_clock_selection.attr, 350 &dev_attr_src_clock.attr, 351 &dev_attr_pci_clock_selection.attr, 352 &dev_attr_pci_clock.attr, 353 &dev_attr_usb_clock.attr, 354 &dev_attr_ref_clock.attr, 355 &dev_attr_cpu_spread.attr, 356 &dev_attr_src_spread.attr, 357 NULL 358 }; 359 360 static ssize_t show_value(struct device *dev, 361 struct device_attribute *devattr, 362 char *buf) 363 { 364 int x; 365 366 if (devattr == &dev_attr_usb_clock) 367 x = 48000; 368 else if (devattr == &dev_attr_ref_clock) 369 x = BASE_CLOCK; 370 else 371 BUG(); 372 373 return sprintf(buf, "%d\n", x); 374 } 375 376 static ssize_t show_spread(struct device *dev, 377 struct device_attribute *devattr, 378 char *buf) 379 { 380 struct ics932s401_data *data = ics932s401_update_device(dev); 381 int reg; 382 unsigned long val; 383 384 if (!(data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD)) 385 return sprintf(buf, "0%%\n"); 386 387 if (devattr == &dev_attr_src_spread) 388 reg = ICS932S401_REG_SRC_SPREAD1; 389 else if (devattr == &dev_attr_cpu_spread) 390 reg = ICS932S401_REG_CPU_SPREAD1; 391 else 392 BUG(); 393 394 val = data->regs[reg] | (data->regs[reg + 1] << 8); 395 val &= ICS932S401_SPREAD_MASK; 396 397 /* Scale 0..2^14 to -0.5. */ 398 val = 500000 * val / 16384; 399 return sprintf(buf, "-0.%lu%%\n", val); 400 } 401 402 /* Return 0 if detection is successful, -ENODEV otherwise */ 403 static int ics932s401_detect(struct i2c_client *client, 404 struct i2c_board_info *info) 405 { 406 struct i2c_adapter *adapter = client->adapter; 407 int vendor, device, revision; 408 409 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 410 return -ENODEV; 411 412 vendor = i2c_smbus_read_word_data(client, ICS932S401_REG_VENDOR_REV); 413 vendor >>= 8; 414 revision = vendor >> ICS932S401_REV_SHIFT; 415 vendor &= ICS932S401_VENDOR_MASK; 416 if (vendor != ICS932S401_VENDOR) 417 return -ENODEV; 418 419 device = i2c_smbus_read_word_data(client, ICS932S401_REG_DEVICE); 420 device >>= 8; 421 if (device != ICS932S401_DEVICE) 422 return -ENODEV; 423 424 if (revision != ICS932S401_REV) 425 dev_info(&adapter->dev, "Unknown revision %d\n", revision); 426 427 strlcpy(info->type, "ics932s401", I2C_NAME_SIZE); 428 429 return 0; 430 } 431 432 static int ics932s401_probe(struct i2c_client *client, 433 const struct i2c_device_id *id) 434 { 435 struct ics932s401_data *data; 436 int err; 437 438 data = kzalloc(sizeof(struct ics932s401_data), GFP_KERNEL); 439 if (!data) { 440 err = -ENOMEM; 441 goto exit; 442 } 443 444 i2c_set_clientdata(client, data); 445 mutex_init(&data->lock); 446 447 dev_info(&client->dev, "%s chip found\n", client->name); 448 449 /* Register sysfs hooks */ 450 data->attrs.attrs = ics932s401_attr; 451 err = sysfs_create_group(&client->dev.kobj, &data->attrs); 452 if (err) 453 goto exit_free; 454 455 return 0; 456 457 exit_free: 458 kfree(data); 459 exit: 460 return err; 461 } 462 463 static int ics932s401_remove(struct i2c_client *client) 464 { 465 struct ics932s401_data *data = i2c_get_clientdata(client); 466 467 sysfs_remove_group(&client->dev.kobj, &data->attrs); 468 kfree(data); 469 return 0; 470 } 471 472 module_i2c_driver(ics932s401_driver); 473 474 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); 475 MODULE_DESCRIPTION("ICS932S401 driver"); 476 MODULE_LICENSE("GPL"); 477 478 /* IBM IntelliStation Z30 */ 479 MODULE_ALIAS("dmi:bvnIBM:*:rn9228:*"); 480 MODULE_ALIAS("dmi:bvnIBM:*:rn9232:*"); 481 482 /* IBM x3650/x3550 */ 483 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650*"); 484 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550*"); 485