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