1 /* 2 * Windfarm PowerMac thermal control. SMU "satellite" controller sensors. 3 * 4 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org> 5 * 6 * Released under the terms of the GNU GPL v2. 7 */ 8 9 #include <linux/types.h> 10 #include <linux/errno.h> 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/init.h> 14 #include <linux/wait.h> 15 #include <linux/i2c.h> 16 #include <linux/mutex.h> 17 #include <asm/prom.h> 18 #include <asm/smu.h> 19 #include <asm/pmac_low_i2c.h> 20 21 #include "windfarm.h" 22 23 #define VERSION "1.0" 24 25 /* If the cache is older than 800ms we'll refetch it */ 26 #define MAX_AGE msecs_to_jiffies(800) 27 28 struct wf_sat { 29 struct kref ref; 30 int nr; 31 struct mutex mutex; 32 unsigned long last_read; /* jiffies when cache last updated */ 33 u8 cache[16]; 34 struct list_head sensors; 35 struct i2c_client *i2c; 36 struct device_node *node; 37 }; 38 39 static struct wf_sat *sats[2]; 40 41 struct wf_sat_sensor { 42 struct list_head link; 43 int index; 44 int index2; /* used for power sensors */ 45 int shift; 46 struct wf_sat *sat; 47 struct wf_sensor sens; 48 }; 49 50 #define wf_to_sat(c) container_of(c, struct wf_sat_sensor, sens) 51 52 struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id, 53 unsigned int *size) 54 { 55 struct wf_sat *sat; 56 int err; 57 unsigned int i, len; 58 u8 *buf; 59 u8 data[4]; 60 61 /* TODO: Add the resulting partition to the device-tree */ 62 63 if (sat_id > 1 || (sat = sats[sat_id]) == NULL) 64 return NULL; 65 66 err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8); 67 if (err) { 68 printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err); 69 return NULL; 70 } 71 72 err = i2c_smbus_read_word_data(sat->i2c, 9); 73 if (err < 0) { 74 printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n"); 75 return NULL; 76 } 77 len = err; 78 if (len == 0) { 79 printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id); 80 return NULL; 81 } 82 83 len = le16_to_cpu(len); 84 len = (len + 3) & ~3; 85 buf = kmalloc(len, GFP_KERNEL); 86 if (buf == NULL) 87 return NULL; 88 89 for (i = 0; i < len; i += 4) { 90 err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data); 91 if (err < 0) { 92 printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n", 93 err); 94 goto fail; 95 } 96 buf[i] = data[1]; 97 buf[i+1] = data[0]; 98 buf[i+2] = data[3]; 99 buf[i+3] = data[2]; 100 } 101 102 printk(KERN_DEBUG "sat %d partition %x:", sat_id, id); 103 print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET, 104 16, 1, buf, len, false); 105 if (size) 106 *size = len; 107 return (struct smu_sdbp_header *) buf; 108 109 fail: 110 kfree(buf); 111 return NULL; 112 } 113 EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition); 114 115 /* refresh the cache */ 116 static int wf_sat_read_cache(struct wf_sat *sat) 117 { 118 int err; 119 120 err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache); 121 if (err < 0) 122 return err; 123 sat->last_read = jiffies; 124 125 #ifdef LOTSA_DEBUG 126 { 127 int i; 128 printk(KERN_DEBUG "wf_sat_get: data is"); 129 print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET, 130 16, 1, sat->cache, 16, false); 131 } 132 #endif 133 return 0; 134 } 135 136 static int wf_sat_sensor_get(struct wf_sensor *sr, s32 *value) 137 { 138 struct wf_sat_sensor *sens = wf_to_sat(sr); 139 struct wf_sat *sat = sens->sat; 140 int i, err; 141 s32 val; 142 143 if (sat->i2c == NULL) 144 return -ENODEV; 145 146 mutex_lock(&sat->mutex); 147 if (time_after(jiffies, (sat->last_read + MAX_AGE))) { 148 err = wf_sat_read_cache(sat); 149 if (err) 150 goto fail; 151 } 152 153 i = sens->index * 2; 154 val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift; 155 if (sens->index2 >= 0) { 156 i = sens->index2 * 2; 157 /* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */ 158 val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4; 159 } 160 161 *value = val; 162 err = 0; 163 164 fail: 165 mutex_unlock(&sat->mutex); 166 return err; 167 } 168 169 static void wf_sat_release(struct kref *ref) 170 { 171 struct wf_sat *sat = container_of(ref, struct wf_sat, ref); 172 173 if (sat->nr >= 0) 174 sats[sat->nr] = NULL; 175 kfree(sat); 176 } 177 178 static void wf_sat_sensor_release(struct wf_sensor *sr) 179 { 180 struct wf_sat_sensor *sens = wf_to_sat(sr); 181 struct wf_sat *sat = sens->sat; 182 183 kfree(sens); 184 kref_put(&sat->ref, wf_sat_release); 185 } 186 187 static const struct wf_sensor_ops wf_sat_ops = { 188 .get_value = wf_sat_sensor_get, 189 .release = wf_sat_sensor_release, 190 .owner = THIS_MODULE, 191 }; 192 193 static int wf_sat_probe(struct i2c_client *client, 194 const struct i2c_device_id *id) 195 { 196 struct device_node *dev = client->dev.of_node; 197 struct wf_sat *sat; 198 struct wf_sat_sensor *sens; 199 const u32 *reg; 200 const char *loc, *type; 201 u8 chip, core; 202 struct device_node *child; 203 int shift, cpu, index; 204 char *name; 205 int vsens[2], isens[2]; 206 207 sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL); 208 if (sat == NULL) 209 return -ENOMEM; 210 sat->nr = -1; 211 sat->node = of_node_get(dev); 212 kref_init(&sat->ref); 213 mutex_init(&sat->mutex); 214 sat->i2c = client; 215 INIT_LIST_HEAD(&sat->sensors); 216 i2c_set_clientdata(client, sat); 217 218 vsens[0] = vsens[1] = -1; 219 isens[0] = isens[1] = -1; 220 child = NULL; 221 while ((child = of_get_next_child(dev, child)) != NULL) { 222 reg = of_get_property(child, "reg", NULL); 223 type = of_get_property(child, "device_type", NULL); 224 loc = of_get_property(child, "location", NULL); 225 if (reg == NULL || loc == NULL) 226 continue; 227 228 /* the cooked sensors are between 0x30 and 0x37 */ 229 if (*reg < 0x30 || *reg > 0x37) 230 continue; 231 index = *reg - 0x30; 232 233 /* expect location to be CPU [AB][01] ... */ 234 if (strncmp(loc, "CPU ", 4) != 0) 235 continue; 236 chip = loc[4] - 'A'; 237 core = loc[5] - '0'; 238 if (chip > 1 || core > 1) { 239 printk(KERN_ERR "wf_sat_create: don't understand " 240 "location %s for %pOF\n", loc, child); 241 continue; 242 } 243 cpu = 2 * chip + core; 244 if (sat->nr < 0) 245 sat->nr = chip; 246 else if (sat->nr != chip) { 247 printk(KERN_ERR "wf_sat_create: can't cope with " 248 "multiple CPU chips on one SAT (%s)\n", loc); 249 continue; 250 } 251 252 if (strcmp(type, "voltage-sensor") == 0) { 253 name = "cpu-voltage"; 254 shift = 4; 255 vsens[core] = index; 256 } else if (strcmp(type, "current-sensor") == 0) { 257 name = "cpu-current"; 258 shift = 8; 259 isens[core] = index; 260 } else if (strcmp(type, "temp-sensor") == 0) { 261 name = "cpu-temp"; 262 shift = 10; 263 } else 264 continue; /* hmmm shouldn't happen */ 265 266 /* the +16 is enough for "cpu-voltage-n" */ 267 sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL); 268 if (sens == NULL) { 269 printk(KERN_ERR "wf_sat_create: couldn't create " 270 "%s sensor %d (no memory)\n", name, cpu); 271 continue; 272 } 273 sens->index = index; 274 sens->index2 = -1; 275 sens->shift = shift; 276 sens->sat = sat; 277 sens->sens.ops = &wf_sat_ops; 278 sens->sens.name = (char *) (sens + 1); 279 snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu); 280 281 if (wf_register_sensor(&sens->sens)) 282 kfree(sens); 283 else { 284 list_add(&sens->link, &sat->sensors); 285 kref_get(&sat->ref); 286 } 287 } 288 289 /* make the power sensors */ 290 for (core = 0; core < 2; ++core) { 291 if (vsens[core] < 0 || isens[core] < 0) 292 continue; 293 cpu = 2 * sat->nr + core; 294 sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL); 295 if (sens == NULL) { 296 printk(KERN_ERR "wf_sat_create: couldn't create power " 297 "sensor %d (no memory)\n", cpu); 298 continue; 299 } 300 sens->index = vsens[core]; 301 sens->index2 = isens[core]; 302 sens->shift = 0; 303 sens->sat = sat; 304 sens->sens.ops = &wf_sat_ops; 305 sens->sens.name = (char *) (sens + 1); 306 snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu); 307 308 if (wf_register_sensor(&sens->sens)) 309 kfree(sens); 310 else { 311 list_add(&sens->link, &sat->sensors); 312 kref_get(&sat->ref); 313 } 314 } 315 316 if (sat->nr >= 0) 317 sats[sat->nr] = sat; 318 319 return 0; 320 } 321 322 static int wf_sat_remove(struct i2c_client *client) 323 { 324 struct wf_sat *sat = i2c_get_clientdata(client); 325 struct wf_sat_sensor *sens; 326 327 /* release sensors */ 328 while(!list_empty(&sat->sensors)) { 329 sens = list_first_entry(&sat->sensors, 330 struct wf_sat_sensor, link); 331 list_del(&sens->link); 332 wf_unregister_sensor(&sens->sens); 333 } 334 sat->i2c = NULL; 335 kref_put(&sat->ref, wf_sat_release); 336 337 return 0; 338 } 339 340 static const struct i2c_device_id wf_sat_id[] = { 341 { "MAC,smu-sat", 0 }, 342 { } 343 }; 344 MODULE_DEVICE_TABLE(i2c, wf_sat_id); 345 346 static struct i2c_driver wf_sat_driver = { 347 .driver = { 348 .name = "wf_smu_sat", 349 }, 350 .probe = wf_sat_probe, 351 .remove = wf_sat_remove, 352 .id_table = wf_sat_id, 353 }; 354 355 module_i2c_driver(wf_sat_driver); 356 357 MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>"); 358 MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control"); 359 MODULE_LICENSE("GPL"); 360