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path: root/drivers/macintosh/windfarm_smu_controls.c
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Diffstat (limited to 'drivers/macintosh/windfarm_smu_controls.c')
-rw-r--r--drivers/macintosh/windfarm_smu_controls.c328
1 files changed, 328 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_smu_controls.c b/drivers/macintosh/windfarm_smu_controls.c
new file mode 100644
index 000000000..c155a54e8
--- /dev/null
+++ b/drivers/macintosh/windfarm_smu_controls.c
@@ -0,0 +1,328 @@
+/*
+ * 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/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, "CPU B PUMP"))
+ fct->ctrl.name = "cpu-pump-1";
+ 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";
+ else if (!strcmp(l, "HDD Fan")) /* seen on iMac G5 iSight */
+ fct->ctrl.name = "hard-drive-fan";
+ else if (!strcmp(l, "ODD Fan")) /* same */
+ fct->ctrl.name = "optical-drive-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");
+