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 37static int smu_supports_new_fans_ops = 1; 38 39/* 40 * SMU fans control object 41 */ 42 43static LIST_HEAD(smu_fans); 44 45struct 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 55static int smu_set_fan(int pwm, u8 id, u16 value) 56{ 57 struct smu_cmd cmd; 58 u8 buffer[16]; 59 DECLARE_COMPLETION_ONSTACK(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 110static 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 117static 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 130static 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 137static 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 143static 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 149static 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 158static struct smu_fan_control *smu_fan_create(struct device_node *node, 159 int pwm_fan) 160{ 161 struct smu_fan_control *fct; 162 const s32 *v; 163 const u32 *reg; 164 const char *l; 165 166 fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL); 167 if (fct == NULL) 168 return NULL; 169 fct->ctrl.ops = &smu_fan_ops; 170 l = of_get_property(node, "location", NULL); 171 if (l == NULL) 172 goto fail; 173 174 fct->fan_type = pwm_fan; 175 fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN; 176 sysfs_attr_init(&fct->ctrl.attr.attr); 177 178 /* We use the name & location here the same way we do for SMU sensors, 179 * see the comment in windfarm_smu_sensors.c. The locations are a bit 180 * less consistent here between the iMac and the desktop models, but 181 * that is good enough for our needs for now at least. 182 * 183 * One problem though is that Apple seem to be inconsistent with case 184 * and the kernel doesn't have strcasecmp =P 185 */ 186 187 fct->ctrl.name = NULL; 188 189 /* Names used on desktop models */ 190 if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") || 191 !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") || 192 !strcmp(l, "CPU A EXHAUST")) 193 fct->ctrl.name = "cpu-rear-fan-0"; 194 else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") || 195 !strcmp(l, "CPU B EXHAUST")) 196 fct->ctrl.name = "cpu-rear-fan-1"; 197 else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") || 198 !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") || 199 !strcmp(l, "CPU A INTAKE")) 200 fct->ctrl.name = "cpu-front-fan-0"; 201 else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") || 202 !strcmp(l, "CPU B INTAKE")) 203 fct->ctrl.name = "cpu-front-fan-1"; 204 else if (!strcmp(l, "CPU A PUMP")) 205 fct->ctrl.name = "cpu-pump-0"; 206 else if (!strcmp(l, "CPU B PUMP")) 207 fct->ctrl.name = "cpu-pump-1"; 208 else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") || 209 !strcmp(l, "EXPANSION SLOTS INTAKE")) 210 fct->ctrl.name = "slots-fan"; 211 else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") || 212 !strcmp(l, "DRIVE BAY A INTAKE")) 213 fct->ctrl.name = "drive-bay-fan"; 214 else if (!strcmp(l, "BACKSIDE")) 215 fct->ctrl.name = "backside-fan"; 216 217 /* Names used on iMac models */ 218 if (!strcmp(l, "System Fan") || !strcmp(l, "System fan")) 219 fct->ctrl.name = "system-fan"; 220 else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan")) 221 fct->ctrl.name = "cpu-fan"; 222 else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive")) 223 fct->ctrl.name = "drive-bay-fan"; 224 else if (!strcmp(l, "HDD Fan")) /* seen on iMac G5 iSight */ 225 fct->ctrl.name = "hard-drive-fan"; 226 else if (!strcmp(l, "ODD Fan")) /* same */ 227 fct->ctrl.name = "optical-drive-fan"; 228 229 /* Unrecognized fan, bail out */ 230 if (fct->ctrl.name == NULL) 231 goto fail; 232 233 /* Get min & max values*/ 234 v = of_get_property(node, "min-value", NULL); 235 if (v == NULL) 236 goto fail; 237 fct->min = *v; 238 v = of_get_property(node, "max-value", NULL); 239 if (v == NULL) 240 goto fail; 241 fct->max = *v; 242 243 /* Get "reg" value */ 244 reg = of_get_property(node, "reg", NULL); 245 if (reg == NULL) 246 goto fail; 247 fct->reg = *reg; 248 249 if (wf_register_control(&fct->ctrl)) 250 goto fail; 251 252 return fct; 253 fail: 254 kfree(fct); 255 return NULL; 256} 257 258 259static int __init smu_controls_init(void) 260{ 261 struct device_node *smu, *fans, *fan; 262 263 if (!smu_present()) 264 return -ENODEV; 265 266 smu = of_find_node_by_type(NULL, "smu"); 267 if (smu == NULL) 268 return -ENODEV; 269 270 /* Look for RPM fans */ 271 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) 272 if (!strcmp(fans->name, "rpm-fans") || 273 of_device_is_compatible(fans, "smu-rpm-fans")) 274 break; 275 for (fan = NULL; 276 fans && (fan = of_get_next_child(fans, fan)) != NULL;) { 277 struct smu_fan_control *fct; 278 279 fct = smu_fan_create(fan, 0); 280 if (fct == NULL) { 281 printk(KERN_WARNING "windfarm: Failed to create SMU " 282 "RPM fan %s\n", fan->name); 283 continue; 284 } 285 list_add(&fct->link, &smu_fans); 286 } 287 of_node_put(fans); 288 289 290 /* Look for PWM fans */ 291 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) 292 if (!strcmp(fans->name, "pwm-fans")) 293 break; 294 for (fan = NULL; 295 fans && (fan = of_get_next_child(fans, fan)) != NULL;) { 296 struct smu_fan_control *fct; 297 298 fct = smu_fan_create(fan, 1); 299 if (fct == NULL) { 300 printk(KERN_WARNING "windfarm: Failed to create SMU " 301 "PWM fan %s\n", fan->name); 302 continue; 303 } 304 list_add(&fct->link, &smu_fans); 305 } 306 of_node_put(fans); 307 of_node_put(smu); 308 309 return 0; 310} 311 312static void __exit smu_controls_exit(void) 313{ 314 struct smu_fan_control *fct; 315 316 while (!list_empty(&smu_fans)) { 317 fct = list_entry(smu_fans.next, struct smu_fan_control, link); 318 list_del(&fct->link); 319 wf_unregister_control(&fct->ctrl); 320 } 321} 322 323 324module_init(smu_controls_init); 325module_exit(smu_controls_exit); 326 327MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); 328MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control"); 329MODULE_LICENSE("GPL"); 330