diff options
Diffstat (limited to 'drivers/macintosh/windfarm_smu_controls.c')
-rw-r--r-- | drivers/macintosh/windfarm_smu_controls.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_smu_controls.c b/drivers/macintosh/windfarm_smu_controls.c new file mode 100644 index 00000000000..2c3158c81ff --- /dev/null +++ b/drivers/macintosh/windfarm_smu_controls.c @@ -0,0 +1,282 @@ +/* + * 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 <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 "0.3" + +#undef DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +/* + * 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(comp); + int rc; + + /* Fill SMU command structure */ + cmd.cmd = SMU_CMD_FAN_COMMAND; + 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 = ∁ + + /* Fill argument buffer */ + memset(buffer, 0, 16); + buffer[0] = pwm ? 0x10 : 0x00; + buffer[1] = 0x01 << id; + *((u16 *)&buffer[2 + id * 2]) = value; + + rc = smu_queue_cmd(&cmd); + if (rc) + return rc; + wait_for_completion(&comp); + 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; + s32 *v; u32 *reg; + char *l; + + fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL); + if (fct == NULL) + return NULL; + fct->ctrl.ops = &smu_fan_ops; + l = (char *)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")) + fct->ctrl.name = "cpu-rear-fan-0"; + else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1")) + 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")) + fct->ctrl.name = "cpu-front-fan-0"; + else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1")) + fct->ctrl.name = "cpu-front-fan-1"; + else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan")) + fct->ctrl.name = "slots-fan"; + else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay")) + fct->ctrl.name = "drive-bay-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 = (s32 *)get_property(node, "min-value", NULL); + if (v == NULL) + goto fail; + fct->min = *v; + v = (s32 *)get_property(node, "max-value", NULL); + if (v == NULL) + goto fail; + fct->max = *v; + + /* Get "reg" value */ + reg = (u32 *)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")) + 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"); + |