drivers/macintosh/windfarm_smu_controls.c

   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 "0.3"
  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 /*
  38  * SMU fans control object
  39  */
  40
  41 static LIST_HEAD(smu_fans);
  42
  43 struct smu_fan_control {
  44         struct list_head        link;
  45         int                     fan_type;       /* 0 = rpm, 1 = pwm */
  46         u32                     reg;            /* index in SMU */
  47         s32                     value;          /* current value */
  48         s32                     min, max;       /* min/max values */
  49         struct wf_control       ctrl;
  50 };
  51 #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
  52
  53 static int smu_set_fan(int pwm, u8 id, u16 value)
  54 {
  55         struct smu_cmd cmd;
  56         u8 buffer[16];
  57         DECLARE_COMPLETION(comp);
  58         int rc;
  59
  60         /* Fill SMU command structure */
  61         cmd.cmd = SMU_CMD_FAN_COMMAND;
  62         cmd.data_len = 14;
  63         cmd.reply_len = 16;
  64         cmd.data_buf = cmd.reply_buf = buffer;
  65         cmd.status = 0;
  66         cmd.done = smu_done_complete;
  67         cmd.misc = &comp;
  68
  69         /* Fill argument buffer */
  70         memset(buffer, 0, 16);
  71         buffer[0] = pwm ? 0x10 : 0x00;
  72         buffer[1] = 0x01 << id;
  73         *((u16 *)&buffer[2 + id * 2]) = value;
  74
  75         rc = smu_queue_cmd(&cmd);
  76         if (rc)
  77                 return rc;
  78         wait_for_completion(&comp);
  79         return cmd.status;
  80 }
  81
  82 static void smu_fan_release(struct wf_control *ct)
  83 {
  84         struct smu_fan_control *fct = to_smu_fan(ct);
  85
  86         kfree(fct);
  87 }
  88
  89 static int smu_fan_set(struct wf_control *ct, s32 value)
  90 {
  91         struct smu_fan_control *fct = to_smu_fan(ct);
  92
  93         if (value < fct->min)
  94                 value = fct->min;
  95         if (value > fct->max)
  96                 value = fct->max;
  97         fct->value = value;
  98
  99         return smu_set_fan(fct->fan_type, fct->reg, value);
 100 }
 101
 102 static int smu_fan_get(struct wf_control *ct, s32 *value)
 103 {
 104         struct smu_fan_control *fct = to_smu_fan(ct);
 105         *value = fct->value; /* todo: read from SMU */
 106         return 0;
 107 }
 108
 109 static s32 smu_fan_min(struct wf_control *ct)
 110 {
 111         struct smu_fan_control *fct = to_smu_fan(ct);
 112         return fct->min;
 113 }
 114
 115 static s32 smu_fan_max(struct wf_control *ct)
 116 {
 117         struct smu_fan_control *fct = to_smu_fan(ct);
 118         return fct->max;
 119 }
 120
 121 static struct wf_control_ops smu_fan_ops = {
 122         .set_value      = smu_fan_set,
 123         .get_value      = smu_fan_get,
 124         .get_min        = smu_fan_min,
 125         .get_max        = smu_fan_max,
 126         .release        = smu_fan_release,
 127         .owner          = THIS_MODULE,
 128 };
 129
 130 static struct smu_fan_control *smu_fan_create(struct device_node *node,
 131                                               int pwm_fan)
 132 {
 133         struct smu_fan_control *fct;
 134         s32 *v; u32 *reg;
 135         char *l;
 136
 137         fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
 138         if (fct == NULL)
 139                 return NULL;
 140         fct->ctrl.ops = &smu_fan_ops;
 141         l = (char *)get_property(node, "location", NULL);
 142         if (l == NULL)
 143                 goto fail;
 144
 145         fct->fan_type = pwm_fan;
 146         fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
 147
 148         /* We use the name & location here the same way we do for SMU sensors,
 149          * see the comment in windfarm_smu_sensors.c. The locations are a bit
 150          * less consistent here between the iMac and the desktop models, but
 151          * that is good enough for our needs for now at least.
 152          *
 153          * One problem though is that Apple seem to be inconsistent with case
 154          * and the kernel doesn't have strcasecmp =P
 155          */
 156
 157         fct->ctrl.name = NULL;
 158
 159         /* Names used on desktop models */
 160         if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
 161             !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan"))
 162                 fct->ctrl.name = "cpu-rear-fan-0";
 163         else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1"))
 164                 fct->ctrl.name = "cpu-rear-fan-1";
 165         else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
 166                  !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan"))
 167                 fct->ctrl.name = "cpu-front-fan-0";
 168         else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1"))
 169                 fct->ctrl.name = "cpu-front-fan-1";
 170         else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan"))
 171                 fct->ctrl.name = "slots-fan";
 172         else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay"))
 173                 fct->ctrl.name = "drive-bay-fan";
 174
 175         /* Names used on iMac models */
 176         if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
 177                 fct->ctrl.name = "system-fan";
 178         else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
 179                 fct->ctrl.name = "cpu-fan";
 180         else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
 181                 fct->ctrl.name = "drive-bay-fan";
 182
 183         /* Unrecognized fan, bail out */
 184         if (fct->ctrl.name == NULL)
 185                 goto fail;
 186
 187         /* Get min & max values*/
 188         v = (s32 *)get_property(node, "min-value", NULL);
 189         if (v == NULL)
 190                 goto fail;
 191         fct->min = *v;
 192         v = (s32 *)get_property(node, "max-value", NULL);
 193         if (v == NULL)
 194                 goto fail;
 195         fct->max = *v;
 196
 197         /* Get "reg" value */
 198         reg = (u32 *)get_property(node, "reg", NULL);
 199         if (reg == NULL)
 200                 goto fail;
 201         fct->reg = *reg;
 202
 203         if (wf_register_control(&fct->ctrl))
 204                 goto fail;
 205
 206         return fct;
 207  fail:
 208         kfree(fct);
 209         return NULL;
 210 }
 211
 212
 213 static int __init smu_controls_init(void)
 214 {
 215         struct device_node *smu, *fans, *fan;
 216
 217         if (!smu_present())
 218                 return -ENODEV;
 219
 220         smu = of_find_node_by_type(NULL, "smu");
 221         if (smu == NULL)
 222                 return -ENODEV;
 223
 224         /* Look for RPM fans */
 225         for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
 226                 if (!strcmp(fans->name, "rpm-fans"))
 227                         break;
 228         for (fan = NULL;
 229              fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
 230                 struct smu_fan_control *fct;
 231
 232                 fct = smu_fan_create(fan, 0);
 233                 if (fct == NULL) {
 234                         printk(KERN_WARNING "windfarm: Failed to create SMU "
 235                                "RPM fan %s\n", fan->name);
 236                         continue;
 237                 }
 238                 list_add(&fct->link, &smu_fans);
 239         }
 240         of_node_put(fans);
 241
 242
 243         /* Look for PWM fans */
 244         for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
 245                 if (!strcmp(fans->name, "pwm-fans"))
 246                         break;
 247         for (fan = NULL;
 248              fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
 249                 struct smu_fan_control *fct;
 250
 251                 fct = smu_fan_create(fan, 1);
 252                 if (fct == NULL) {
 253                         printk(KERN_WARNING "windfarm: Failed to create SMU "
 254                                "PWM fan %s\n", fan->name);
 255                         continue;
 256                 }
 257                 list_add(&fct->link, &smu_fans);
 258         }
 259         of_node_put(fans);
 260         of_node_put(smu);
 261
 262         return 0;
 263 }
 264
 265 static void __exit smu_controls_exit(void)
 266 {
 267         struct smu_fan_control *fct;
 268
 269         while (!list_empty(&smu_fans)) {
 270                 fct = list_entry(smu_fans.next, struct smu_fan_control, link);
 271                 list_del(&fct->link);
 272                 wf_unregister_control(&fct->ctrl);
 273         }
 274 }
 275
 276
 277 module_init(smu_controls_init);
 278 module_exit(smu_controls_exit);
 279
 280 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 281 MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
 282 MODULE_LICENSE("GPL");
 283