Logo Search packages:      
Sourcecode: linux version File versions  Download package

windfarm_smu_controls.c

/*
 * Windfarm PowerMac thermal control. SMU based controls
 *
 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 *
 * Released under the term of the GNU GPL v2.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/completion.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/smu.h>

#include "windfarm.h"

#define VERSION "0.4"

#undef DEBUG

#ifdef DEBUG
#define DBG(args...)    printk(args)
#else
#define DBG(args...)    do { } while(0)
#endif

static int smu_supports_new_fans_ops = 1;

/*
 * SMU fans control object
 */

static LIST_HEAD(smu_fans);

struct smu_fan_control {
      struct list_head  link;
      int                     fan_type;   /* 0 = rpm, 1 = pwm */
      u32               reg;        /* index in SMU */
      s32               value;            /* current value */
      s32               min, max;   /* min/max values */
      struct wf_control ctrl;
};
#define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)

static int smu_set_fan(int pwm, u8 id, u16 value)
{
      struct smu_cmd cmd;
      u8 buffer[16];
      DECLARE_COMPLETION_ONSTACK(comp);
      int rc;

      /* Fill SMU command structure */
      cmd.cmd = SMU_CMD_FAN_COMMAND;

      /* The SMU has an "old" and a "new" way of setting the fan speed
       * Unfortunately, I found no reliable way to know which one works
       * on a given machine model. After some investigations it appears
       * that MacOS X just tries the new one, and if it fails fallbacks
       * to the old ones ... Ugh.
       */
 retry:
      if (smu_supports_new_fans_ops) {
            buffer[0] = 0x30;
            buffer[1] = id;
            *((u16 *)(&buffer[2])) = value;
            cmd.data_len = 4;
      } else {
            if (id > 7)
                  return -EINVAL;
            /* Fill argument buffer */
            memset(buffer, 0, 16);
            buffer[0] = pwm ? 0x10 : 0x00;
            buffer[1] = 0x01 << id;
            *((u16 *)&buffer[2 + id * 2]) = value;
            cmd.data_len = 14;
      }

      cmd.reply_len = 16;
      cmd.data_buf = cmd.reply_buf = buffer;
      cmd.status = 0;
      cmd.done = smu_done_complete;
      cmd.misc = &comp;

      rc = smu_queue_cmd(&cmd);
      if (rc)
            return rc;
      wait_for_completion(&comp);

      /* Handle fallback (see coment above) */
      if (cmd.status != 0 && smu_supports_new_fans_ops) {
            printk(KERN_WARNING "windfarm: SMU failed new fan command "
                   "falling back to old method\n");
            smu_supports_new_fans_ops = 0;
            goto retry;
      }

      return cmd.status;
}

static void smu_fan_release(struct wf_control *ct)
{
      struct smu_fan_control *fct = to_smu_fan(ct);

      kfree(fct);
}

static int smu_fan_set(struct wf_control *ct, s32 value)
{
      struct smu_fan_control *fct = to_smu_fan(ct);

      if (value < fct->min)
            value = fct->min;
      if (value > fct->max)
            value = fct->max;
      fct->value = value;

      return smu_set_fan(fct->fan_type, fct->reg, value);
}

static int smu_fan_get(struct wf_control *ct, s32 *value)
{
      struct smu_fan_control *fct = to_smu_fan(ct);
      *value = fct->value; /* todo: read from SMU */
      return 0;
}

static s32 smu_fan_min(struct wf_control *ct)
{
      struct smu_fan_control *fct = to_smu_fan(ct);
      return fct->min;
}

static s32 smu_fan_max(struct wf_control *ct)
{
      struct smu_fan_control *fct = to_smu_fan(ct);
      return fct->max;
}

static struct wf_control_ops smu_fan_ops = {
      .set_value  = smu_fan_set,
      .get_value  = smu_fan_get,
      .get_min    = smu_fan_min,
      .get_max    = smu_fan_max,
      .release    = smu_fan_release,
      .owner            = THIS_MODULE,
};

static struct smu_fan_control *smu_fan_create(struct device_node *node,
                                    int pwm_fan)
{
      struct smu_fan_control *fct;
      const s32 *v;
      const u32 *reg;
      const char *l;

      fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
      if (fct == NULL)
            return NULL;
      fct->ctrl.ops = &smu_fan_ops;
      l = of_get_property(node, "location", NULL);
      if (l == NULL)
            goto fail;

      fct->fan_type = pwm_fan;
      fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;

      /* We use the name & location here the same way we do for SMU sensors,
       * see the comment in windfarm_smu_sensors.c. The locations are a bit
       * less consistent here between the iMac and the desktop models, but
       * that is good enough for our needs for now at least.
       *
       * One problem though is that Apple seem to be inconsistent with case
       * and the kernel doesn't have strcasecmp =P
       */

      fct->ctrl.name = NULL;

      /* Names used on desktop models */
      if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
          !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") ||
          !strcmp(l, "CPU A EXHAUST"))
            fct->ctrl.name = "cpu-rear-fan-0";
      else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") ||
             !strcmp(l, "CPU B EXHAUST"))
            fct->ctrl.name = "cpu-rear-fan-1";
      else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
             !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") ||
             !strcmp(l, "CPU A INTAKE"))
            fct->ctrl.name = "cpu-front-fan-0";
      else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") ||
             !strcmp(l, "CPU B INTAKE"))
            fct->ctrl.name = "cpu-front-fan-1";
      else if (!strcmp(l, "CPU A PUMP"))
            fct->ctrl.name = "cpu-pump-0";
      else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") ||
             !strcmp(l, "EXPANSION SLOTS INTAKE"))
            fct->ctrl.name = "slots-fan";
      else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") ||
             !strcmp(l, "DRIVE BAY A INTAKE"))
            fct->ctrl.name = "drive-bay-fan";
      else if (!strcmp(l, "BACKSIDE"))
            fct->ctrl.name = "backside-fan";

      /* Names used on iMac models */
      if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
            fct->ctrl.name = "system-fan";
      else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
            fct->ctrl.name = "cpu-fan";
      else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
            fct->ctrl.name = "drive-bay-fan";

      /* Unrecognized fan, bail out */
      if (fct->ctrl.name == NULL)
            goto fail;

      /* Get min & max values*/
      v = of_get_property(node, "min-value", NULL);
      if (v == NULL)
            goto fail;
      fct->min = *v;
      v = of_get_property(node, "max-value", NULL);
      if (v == NULL)
            goto fail;
      fct->max = *v;

      /* Get "reg" value */
      reg = of_get_property(node, "reg", NULL);
      if (reg == NULL)
            goto fail;
      fct->reg = *reg;

      if (wf_register_control(&fct->ctrl))
            goto fail;

      return fct;
 fail:
      kfree(fct);
      return NULL;
}


static int __init smu_controls_init(void)
{
      struct device_node *smu, *fans, *fan;

      if (!smu_present())
            return -ENODEV;

      smu = of_find_node_by_type(NULL, "smu");
      if (smu == NULL)
            return -ENODEV;

      /* Look for RPM fans */
      for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
            if (!strcmp(fans->name, "rpm-fans") ||
                of_device_is_compatible(fans, "smu-rpm-fans"))
                  break;
      for (fan = NULL;
           fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
            struct smu_fan_control *fct;

            fct = smu_fan_create(fan, 0);
            if (fct == NULL) {
                  printk(KERN_WARNING "windfarm: Failed to create SMU "
                         "RPM fan %s\n", fan->name);
                  continue;
            }
            list_add(&fct->link, &smu_fans);
      }
      of_node_put(fans);


      /* Look for PWM fans */
      for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
            if (!strcmp(fans->name, "pwm-fans"))
                  break;
      for (fan = NULL;
           fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
            struct smu_fan_control *fct;

            fct = smu_fan_create(fan, 1);
            if (fct == NULL) {
                  printk(KERN_WARNING "windfarm: Failed to create SMU "
                         "PWM fan %s\n", fan->name);
                  continue;
            }
            list_add(&fct->link, &smu_fans);
      }
      of_node_put(fans);
      of_node_put(smu);

      return 0;
}

static void __exit smu_controls_exit(void)
{
      struct smu_fan_control *fct;

      while (!list_empty(&smu_fans)) {
            fct = list_entry(smu_fans.next, struct smu_fan_control, link);
            list_del(&fct->link);
            wf_unregister_control(&fct->ctrl);
      }
}


module_init(smu_controls_init);
module_exit(smu_controls_exit);

MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
MODULE_LICENSE("GPL");


Generated by  Doxygen 1.6.0   Back to index