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 <asm/prom.h>
  18 #include <asm/machdep.h>
  19 #include <asm/io.h>
  20 #include <asm/system.h>
  21 #include <asm/sections.h>
  22 #include <asm/smu.h>
  23
  24 #include "windfarm.h"
  25
  26 #define VERSION "0.3"
  27
  28 #undef DEBUG
  29
  30 #ifdef DEBUG
  31 #define DBG(args...)    printk(args)
  32 #else
  33 #define DBG(args...)    do { } while(0)
  34 #endif
  35
  36 /*
  37  * SMU fans control object
  38  */
  39
  40 static LIST_HEAD(smu_fans);
  41
  42 struct smu_fan_control {
  43         struct list_head        link;
  44         int                     fan_type;       /* 0 = rpm, 1 = pwm */
  45         u32                     reg;            /* index in SMU */
  46         s32                     value;          /* current value */
  47         s32                     min, max;       /* min/max values */
  48         struct wf_control       ctrl;
  49 };
  50 #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
  51
  52 static int smu_set_fan(int pwm, u8 id, u16 value)
  53 {
  54         struct smu_cmd cmd;
  55         u8 buffer[16];
  56         DECLARE_COMPLETION(comp);
  57         int rc;
  58
  59         /* Fill SMU command structure */
  60         cmd.cmd = SMU_CMD_FAN_COMMAND;
  61         cmd.data_len = 14;
  62         cmd.reply_len = 16;
  63         cmd.data_buf = cmd.reply_buf = buffer;
  64         cmd.status = 0;
  65         cmd.done = smu_done_complete;
  66         cmd.misc = &comp;
  67
  68         /* Fill argument buffer */
  69         memset(buffer, 0, 16);
  70         buffer[0] = pwm ? 0x10 : 0x00;
  71         buffer[1] = 0x01 << id;
  72         *((u16 *)&buffer[2 + id * 2]) = value;
  73
  74         rc = smu_queue_cmd(&cmd);
  75         if (rc)
  76                 return rc;
  77         wait_for_completion(&comp);
  78         return cmd.status;
  79 }
  80
  81 static void smu_fan_release(struct wf_control *ct)
  82 {
  83         struct smu_fan_control *fct = to_smu_fan(ct);
  84
  85         kfree(fct);
  86 }
  87
  88 static int smu_fan_set(struct wf_control *ct, s32 value)
  89 {
  90         struct smu_fan_control *fct = to_smu_fan(ct);
  91
  92         if (value < fct->min)
  93                 value = fct->min;
  94         if (value > fct->max)
  95                 value = fct->max;
  96         fct->value = value;
  97
  98         return smu_set_fan(fct->fan_type, fct->reg, value);
  99 }
 100
 101 static int smu_fan_get(struct wf_control *ct, s32 *value)
 102 {
 103         struct smu_fan_control *fct = to_smu_fan(ct);
 104         *value = fct->value; /* todo: read from SMU */
 105         return 0;
 106 }
 107
 108 static s32 smu_fan_min(struct wf_control *ct)
 109 {
 110         struct smu_fan_control *fct = to_smu_fan(ct);
 111         return fct->min;
 112 }
 113
 114 static s32 smu_fan_max(struct wf_control *ct)
 115 {
 116         struct smu_fan_control *fct = to_smu_fan(ct);
 117         return fct->max;
 118 }
 119
 120 static struct wf_control_ops smu_fan_ops = {
 121         .set_value      = smu_fan_set,
 122         .get_value      = smu_fan_get,
 123         .get_min        = smu_fan_min,
 124         .get_max        = smu_fan_max,
 125         .release        = smu_fan_release,
 126         .owner          = THIS_MODULE,
 127 };
 128
 129 static struct smu_fan_control *smu_fan_create(struct device_node *node,
 130                                               int pwm_fan)
 131 {
 132         struct smu_fan_control *fct;
 133         s32 *v; u32 *reg;
 134         char *l;
 135
 136         fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
 137         if (fct == NULL)
 138                 return NULL;
 139         fct->ctrl.ops = &smu_fan_ops;
 140         l = (char *)get_property(node, "location", NULL);
 141         if (l == NULL)
 142                 goto fail;
 143
 144         fct->fan_type = pwm_fan;
 145         fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
 146
 147         /* We use the name & location here the same way we do for SMU sensors,
 148          * see the comment in windfarm_smu_sensors.c. The locations are a bit
 149          * less consistent here between the iMac and the desktop models, but
 150          * that is good enough for our needs for now at least.
 151          *
 152          * One problem though is that Apple seem to be inconsistent with case
 153          * and the kernel doesn't have strcasecmp =P
 154          */
 155
 156         fct->ctrl.name = NULL;
 157
 158         /* Names used on desktop models */
 159         if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
 160             !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan"))
 161                 fct->ctrl.name = "cpu-rear-fan-0";
 162         else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1"))
 163                 fct->ctrl.name = "cpu-rear-fan-1";
 164         else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
 165                  !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan"))
 166                 fct->ctrl.name = "cpu-front-fan-0";
 167         else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1"))
 168                 fct->ctrl.name = "cpu-front-fan-1";
 169         else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan"))
 170                 fct->ctrl.name = "slots-fan";
 171         else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay"))
 172                 fct->ctrl.name = "drive-bay-fan";
 173
 174         /* Names used on iMac models */
 175         if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
 176                 fct->ctrl.name = "system-fan";
 177         else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
 178                 fct->ctrl.name = "cpu-fan";
 179         else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
 180                 fct->ctrl.name = "drive-bay-fan";
 181
 182         /* Unrecognized fan, bail out */
 183         if (fct->ctrl.name == NULL)
 184                 goto fail;
 185
 186         /* Get min & max values*/
 187         v = (s32 *)get_property(node, "min-value", NULL);
 188         if (v == NULL)
 189                 goto fail;
 190         fct->min = *v;
 191         v = (s32 *)get_property(node, "max-value", NULL);
 192         if (v == NULL)
 193                 goto fail;
 194         fct->max = *v;
 195
 196         /* Get "reg" value */
 197         reg = (u32 *)get_property(node, "reg", NULL);
 198         if (reg == NULL)
 199                 goto fail;
 200         fct->reg = *reg;
 201
 202         if (wf_register_control(&fct->ctrl))
 203                 goto fail;
 204
 205         return fct;
 206  fail:
 207         kfree(fct);
 208         return NULL;
 209 }
 210
 211
 212 static int __init smu_controls_init(void)
 213 {
 214         struct device_node *smu, *fans, *fan;
 215
 216         if (!smu_present())
 217                 return -ENODEV;
 218
 219         smu = of_find_node_by_type(NULL, "smu");
 220         if (smu == NULL)
 221                 return -ENODEV;
 222
 223         /* Look for RPM fans */
 224         for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
 225                 if (!strcmp(fans->name, "rpm-fans"))
 226                         break;
 227         for (fan = NULL;
 228              fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
 229                 struct smu_fan_control *fct;
 230
 231                 fct = smu_fan_create(fan, 0);
 232                 if (fct == NULL) {
 233                         printk(KERN_WARNING "windfarm: Failed to create SMU "
 234                                "RPM fan %s\n", fan->name);
 235                         continue;
 236                 }
 237                 list_add(&fct->link, &smu_fans);
 238         }
 239         of_node_put(fans);
 240
 241
 242         /* Look for PWM fans */
 243         for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
 244                 if (!strcmp(fans->name, "pwm-fans"))
 245                         break;
 246         for (fan = NULL;
 247              fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
 248                 struct smu_fan_control *fct;
 249
 250                 fct = smu_fan_create(fan, 1);
 251                 if (fct == NULL) {
 252                         printk(KERN_WARNING "windfarm: Failed to create SMU "
 253                                "PWM fan %s\n", fan->name);
 254                         continue;
 255                 }
 256                 list_add(&fct->link, &smu_fans);
 257         }
 258         of_node_put(fans);
 259         of_node_put(smu);
 260
 261         return 0;
 262 }
 263
 264 static void __exit smu_controls_exit(void)
 265 {
 266         struct smu_fan_control *fct;
 267
 268         while (!list_empty(&smu_fans)) {
 269                 fct = list_entry(smu_fans.next, struct smu_fan_control, link);
 270                 list_del(&fct->link);
 271                 wf_unregister_control(&fct->ctrl);
 272         }
 273 }
 274
 275
 276 module_init(smu_controls_init);
 277 module_exit(smu_controls_exit);
 278
 279 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 280 MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
 281 MODULE_LICENSE("GPL");
 282