1 /* 2 * Windfarm PowerMac thermal control. SMU based controls 3 * 4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. 5 * <benh@kernel.crashing.org> 6 * 7 * Released under the term of the GNU GPL v2. 8 */ 9 10 #include <linux/types.h> 11 #include <linux/errno.h> 12 #include <linux/kernel.h> 13 #include <linux/delay.h> 14 #include <linux/slab.h> 15 #include <linux/init.h> 16 #include <linux/wait.h> 17 #include <linux/completion.h> 18 #include <asm/prom.h> 19 #include <asm/machdep.h> 20 #include <asm/io.h> 21 #include <asm/system.h> 22 #include <asm/sections.h> 23 #include <asm/smu.h> 24 25 #include "windfarm.h" 26 27 #define VERSION "0.4" 28 29 #undef DEBUG 30 31 #ifdef DEBUG 32 #define DBG(args...) printk(args) 33 #else 34 #define DBG(args...) do { } while(0) 35 #endif 36 37 static int smu_supports_new_fans_ops = 1; 38 39 /* 40 * SMU fans control object 41 */ 42 43 static LIST_HEAD(smu_fans); 44 45 struct smu_fan_control { 46 struct list_head link; 47 int fan_type; /* 0 = rpm, 1 = pwm */ 48 u32 reg; /* index in SMU */ 49 s32 value; /* current value */ 50 s32 min, max; /* min/max values */ 51 struct wf_control ctrl; 52 }; 53 #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl) 54 55 static int smu_set_fan(int pwm, u8 id, u16 value) 56 { 57 struct smu_cmd cmd; 58 u8 buffer[16]; 59 DECLARE_COMPLETION(comp); 60 int rc; 61 62 /* Fill SMU command structure */ 63 cmd.cmd = SMU_CMD_FAN_COMMAND; 64 65 /* The SMU has an "old" and a "new" way of setting the fan speed 66 * Unfortunately, I found no reliable way to know which one works 67 * on a given machine model. After some investigations it appears 68 * that MacOS X just tries the new one, and if it fails fallbacks 69 * to the old ones ... Ugh. 70 */ 71 retry: 72 if (smu_supports_new_fans_ops) { 73 buffer[0] = 0x30; 74 buffer[1] = id; 75 *((u16 *)(&buffer[2])) = value; 76 cmd.data_len = 4; 77 } else { 78 if (id > 7) 79 return -EINVAL; 80 /* Fill argument buffer */ 81 memset(buffer, 0, 16); 82 buffer[0] = pwm ? 0x10 : 0x00; 83 buffer[1] = 0x01 << id; 84 *((u16 *)&buffer[2 + id * 2]) = value; 85 cmd.data_len = 14; 86 } 87 88 cmd.reply_len = 16; 89 cmd.data_buf = cmd.reply_buf = buffer; 90 cmd.status = 0; 91 cmd.done = smu_done_complete; 92 cmd.misc = ∁ 93 94 rc = smu_queue_cmd(&cmd); 95 if (rc) 96 return rc; 97 wait_for_completion(&comp); 98 99 /* Handle fallback (see coment above) */ 100 if (cmd.status != 0 && smu_supports_new_fans_ops) { 101 printk(KERN_WARNING "windfarm: SMU failed new fan command " 102 "falling back to old method\n"); 103 smu_supports_new_fans_ops = 0; 104 goto retry; 105 } 106 107 return cmd.status; 108 } 109 110 static void smu_fan_release(struct wf_control *ct) 111 { 112 struct smu_fan_control *fct = to_smu_fan(ct); 113 114 kfree(fct); 115 } 116 117 static int smu_fan_set(struct wf_control *ct, s32 value) 118 { 119 struct smu_fan_control *fct = to_smu_fan(ct); 120 121 if (value < fct->min) 122 value = fct->min; 123 if (value > fct->max) 124 value = fct->max; 125 fct->value = value; 126 127 return smu_set_fan(fct->fan_type, fct->reg, value); 128 } 129 130 static int smu_fan_get(struct wf_control *ct, s32 *value) 131 { 132 struct smu_fan_control *fct = to_smu_fan(ct); 133 *value = fct->value; /* todo: read from SMU */ 134 return 0; 135 } 136 137 static s32 smu_fan_min(struct wf_control *ct) 138 { 139 struct smu_fan_control *fct = to_smu_fan(ct); 140 return fct->min; 141 } 142 143 static s32 smu_fan_max(struct wf_control *ct) 144 { 145 struct smu_fan_control *fct = to_smu_fan(ct); 146 return fct->max; 147 } 148 149 static struct wf_control_ops smu_fan_ops = { 150 .set_value = smu_fan_set, 151 .get_value = smu_fan_get, 152 .get_min = smu_fan_min, 153 .get_max = smu_fan_max, 154 .release = smu_fan_release, 155 .owner = THIS_MODULE, 156 }; 157 158 static struct smu_fan_control *smu_fan_create(struct device_node *node, 159 int pwm_fan) 160 { 161 struct smu_fan_control *fct; 162 s32 *v; u32 *reg; 163 char *l; 164 165 fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL); 166 if (fct == NULL) 167 return NULL; 168 fct->ctrl.ops = &smu_fan_ops; 169 l = (char *)get_property(node, "location", NULL); 170 if (l == NULL) 171 goto fail; 172 173 fct->fan_type = pwm_fan; 174 fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN; 175 176 /* We use the name & location here the same way we do for SMU sensors, 177 * see the comment in windfarm_smu_sensors.c. The locations are a bit 178 * less consistent here between the iMac and the desktop models, but 179 * that is good enough for our needs for now at least. 180 * 181 * One problem though is that Apple seem to be inconsistent with case 182 * and the kernel doesn't have strcasecmp =P 183 */ 184 185 fct->ctrl.name = NULL; 186 187 /* Names used on desktop models */ 188 if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") || 189 !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") || 190 !strcmp(l, "CPU A EXHAUST")) 191 fct->ctrl.name = "cpu-rear-fan-0"; 192 else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") || 193 !strcmp(l, "CPU B EXHAUST")) 194 fct->ctrl.name = "cpu-rear-fan-1"; 195 else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") || 196 !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") || 197 !strcmp(l, "CPU A INTAKE")) 198 fct->ctrl.name = "cpu-front-fan-0"; 199 else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") || 200 !strcmp(l, "CPU B INTAKE")) 201 fct->ctrl.name = "cpu-front-fan-1"; 202 else if (!strcmp(l, "CPU A PUMP")) 203 fct->ctrl.name = "cpu-pump-0"; 204 else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") || 205 !strcmp(l, "EXPANSION SLOTS INTAKE")) 206 fct->ctrl.name = "slots-fan"; 207 else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") || 208 !strcmp(l, "DRIVE BAY A INTAKE")) 209 fct->ctrl.name = "drive-bay-fan"; 210 else if (!strcmp(l, "BACKSIDE")) 211 fct->ctrl.name = "backside-fan"; 212 213 /* Names used on iMac models */ 214 if (!strcmp(l, "System Fan") || !strcmp(l, "System fan")) 215 fct->ctrl.name = "system-fan"; 216 else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan")) 217 fct->ctrl.name = "cpu-fan"; 218 else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive")) 219 fct->ctrl.name = "drive-bay-fan"; 220 221 /* Unrecognized fan, bail out */ 222 if (fct->ctrl.name == NULL) 223 goto fail; 224 225 /* Get min & max values*/ 226 v = (s32 *)get_property(node, "min-value", NULL); 227 if (v == NULL) 228 goto fail; 229 fct->min = *v; 230 v = (s32 *)get_property(node, "max-value", NULL); 231 if (v == NULL) 232 goto fail; 233 fct->max = *v; 234 235 /* Get "reg" value */ 236 reg = (u32 *)get_property(node, "reg", NULL); 237 if (reg == NULL) 238 goto fail; 239 fct->reg = *reg; 240 241 if (wf_register_control(&fct->ctrl)) 242 goto fail; 243 244 return fct; 245 fail: 246 kfree(fct); 247 return NULL; 248 } 249 250 251 static int __init smu_controls_init(void) 252 { 253 struct device_node *smu, *fans, *fan; 254 255 if (!smu_present()) 256 return -ENODEV; 257 258 smu = of_find_node_by_type(NULL, "smu"); 259 if (smu == NULL) 260 return -ENODEV; 261 262 /* Look for RPM fans */ 263 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) 264 if (!strcmp(fans->name, "rpm-fans") || 265 device_is_compatible(fans, "smu-rpm-fans")) 266 break; 267 for (fan = NULL; 268 fans && (fan = of_get_next_child(fans, fan)) != NULL;) { 269 struct smu_fan_control *fct; 270 271 fct = smu_fan_create(fan, 0); 272 if (fct == NULL) { 273 printk(KERN_WARNING "windfarm: Failed to create SMU " 274 "RPM fan %s\n", fan->name); 275 continue; 276 } 277 list_add(&fct->link, &smu_fans); 278 } 279 of_node_put(fans); 280 281 282 /* Look for PWM fans */ 283 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) 284 if (!strcmp(fans->name, "pwm-fans")) 285 break; 286 for (fan = NULL; 287 fans && (fan = of_get_next_child(fans, fan)) != NULL;) { 288 struct smu_fan_control *fct; 289 290 fct = smu_fan_create(fan, 1); 291 if (fct == NULL) { 292 printk(KERN_WARNING "windfarm: Failed to create SMU " 293 "PWM fan %s\n", fan->name); 294 continue; 295 } 296 list_add(&fct->link, &smu_fans); 297 } 298 of_node_put(fans); 299 of_node_put(smu); 300 301 return 0; 302 } 303 304 static void __exit smu_controls_exit(void) 305 { 306 struct smu_fan_control *fct; 307 308 while (!list_empty(&smu_fans)) { 309 fct = list_entry(smu_fans.next, struct smu_fan_control, link); 310 list_del(&fct->link); 311 wf_unregister_control(&fct->ctrl); 312 } 313 } 314 315 316 module_init(smu_controls_init); 317 module_exit(smu_controls_exit); 318 319 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); 320 MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control"); 321 MODULE_LICENSE("GPL"); 322 323