diff options
Diffstat (limited to 'drivers/macintosh')
| -rw-r--r-- | drivers/macintosh/Kconfig | 19 | ||||
| -rw-r--r-- | drivers/macintosh/Makefile | 9 | ||||
| -rw-r--r-- | drivers/macintosh/adbhid.c | 3 | ||||
| -rw-r--r-- | drivers/macintosh/smu.c | 174 | ||||
| -rw-r--r-- | drivers/macintosh/therm_pm72.c | 3 | ||||
| -rw-r--r-- | drivers/macintosh/via-pmu.c | 10 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm.h | 131 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm_core.c | 426 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm_cpufreq_clamp.c | 105 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm_lm75_sensor.c | 263 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm_pid.c | 145 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm_pid.h | 84 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm_pm81.c | 879 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm_pm91.c | 814 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm_smu_controls.c | 282 | ||||
| -rw-r--r-- | drivers/macintosh/windfarm_smu_sensors.c | 479 |
16 files changed, 3811 insertions, 15 deletions
diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig index bc3e096d84f7..a0ea44c3e8b1 100644 --- a/drivers/macintosh/Kconfig +++ b/drivers/macintosh/Kconfig @@ -169,6 +169,25 @@ config THERM_PM72 This driver provides thermostat and fan control for the desktop G5 machines. +config WINDFARM + tristate "New PowerMac thermal control infrastructure" + +config WINDFARM_PM81 + tristate "Support for thermal management on iMac G5" + depends on WINDFARM && I2C && CPU_FREQ_PMAC64 && PMAC_SMU + select I2C_PMAC_SMU + help + This driver provides thermal control for the iMacG5 + +config WINDFARM_PM91 + tristate "Support for thermal management on PowerMac9,1" + depends on WINDFARM && I2C && CPU_FREQ_PMAC64 && PMAC_SMU + select I2C_PMAC_SMU + help + This driver provides thermal control for the PowerMac9,1 + which is the recent (SMU based) single CPU desktop G5 + + config ANSLCD tristate "Support for ANS LCD display" depends on ADB_CUDA && PPC_PMAC diff --git a/drivers/macintosh/Makefile b/drivers/macintosh/Makefile index 236291bd48a4..f4657aa81fb0 100644 --- a/drivers/macintosh/Makefile +++ b/drivers/macintosh/Makefile @@ -26,3 +26,12 @@ obj-$(CONFIG_ADB_MACIO) += macio-adb.o obj-$(CONFIG_THERM_PM72) += therm_pm72.o obj-$(CONFIG_THERM_WINDTUNNEL) += therm_windtunnel.o obj-$(CONFIG_THERM_ADT746X) += therm_adt746x.o +obj-$(CONFIG_WINDFARM) += windfarm_core.o +obj-$(CONFIG_WINDFARM_PM81) += windfarm_smu_controls.o \ + windfarm_smu_sensors.o \ + windfarm_lm75_sensor.o windfarm_pid.o \ + windfarm_cpufreq_clamp.o windfarm_pm81.o +obj-$(CONFIG_WINDFARM_PM91) += windfarm_smu_controls.o \ + windfarm_smu_sensors.o \ + windfarm_lm75_sensor.o windfarm_pid.o \ + windfarm_cpufreq_clamp.o windfarm_pm91.o diff --git a/drivers/macintosh/adbhid.c b/drivers/macintosh/adbhid.c index 8f02c155fdc0..c0b46bceb5df 100644 --- a/drivers/macintosh/adbhid.c +++ b/drivers/macintosh/adbhid.c @@ -857,8 +857,7 @@ adbhid_input_register(int id, int default_id, int original_handler_id, static void adbhid_input_unregister(int id) { input_unregister_device(adbhid[id]->input); - if (adbhid[id]->keycode) - kfree(adbhid[id]->keycode); + kfree(adbhid[id]->keycode); kfree(adbhid[id]); adbhid[id] = NULL; } diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c index 34f3c7e2d832..e8378274d710 100644 --- a/drivers/macintosh/smu.c +++ b/drivers/macintosh/smu.c @@ -47,13 +47,13 @@ #include <asm/uaccess.h> #include <asm/of_device.h> -#define VERSION "0.6" +#define VERSION "0.7" #define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp." #undef DEBUG_SMU #ifdef DEBUG_SMU -#define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0) +#define DPRINTK(fmt, args...) do { udbg_printf(KERN_DEBUG fmt , ##args); } while (0) #else #define DPRINTK(fmt, args...) do { } while (0) #endif @@ -92,7 +92,7 @@ struct smu_device { * for now, just hard code that */ static struct smu_device *smu; - +static DECLARE_MUTEX(smu_part_access); /* * SMU driver low level stuff @@ -113,9 +113,11 @@ static void smu_start_cmd(void) DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd, cmd->data_len); - DPRINTK("SMU: data buffer: %02x %02x %02x %02x ...\n", + DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n", ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1], - ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3]); + ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3], + ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5], + ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]); /* Fill the SMU command buffer */ smu->cmd_buf->cmd = cmd->cmd; @@ -440,7 +442,7 @@ int smu_present(void) EXPORT_SYMBOL(smu_present); -int smu_init (void) +int __init smu_init (void) { struct device_node *np; u32 *data; @@ -588,6 +590,8 @@ static void smu_expose_childs(void *unused) sprintf(name, "smu-i2c-%02x", *reg); of_platform_device_create(np, name, &smu->of_dev->dev); } + if (device_is_compatible(np, "smu-sensors")) + of_platform_device_create(np, "smu-sensors", &smu->of_dev->dev); } } @@ -845,6 +849,156 @@ int smu_queue_i2c(struct smu_i2c_cmd *cmd) return 0; } +/* + * Handling of "partitions" + */ + +static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len) +{ + DECLARE_COMPLETION(comp); + unsigned int chunk; + struct smu_cmd cmd; + int rc; + u8 params[8]; + + /* We currently use a chunk size of 0xe. We could check the + * SMU firmware version and use bigger sizes though + */ + chunk = 0xe; + + while (len) { + unsigned int clen = min(len, chunk); + + cmd.cmd = SMU_CMD_MISC_ee_COMMAND; + cmd.data_len = 7; + cmd.data_buf = params; + cmd.reply_len = chunk; + cmd.reply_buf = dest; + cmd.done = smu_done_complete; + cmd.misc = ∁ + params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC; + params[1] = 0x4; + *((u32 *)¶ms[2]) = addr; + params[6] = clen; + + rc = smu_queue_cmd(&cmd); + if (rc) + return rc; + wait_for_completion(&comp); + if (cmd.status != 0) + return rc; + if (cmd.reply_len != clen) { + printk(KERN_DEBUG "SMU: short read in " + "smu_read_datablock, got: %d, want: %d\n", + cmd.reply_len, clen); + return -EIO; + } + len -= clen; + addr += clen; + dest += clen; + } + return 0; +} + +static struct smu_sdbp_header *smu_create_sdb_partition(int id) +{ + DECLARE_COMPLETION(comp); + struct smu_simple_cmd cmd; + unsigned int addr, len, tlen; + struct smu_sdbp_header *hdr; + struct property *prop; + + /* First query the partition info */ + smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2, + smu_done_complete, &comp, + SMU_CMD_PARTITION_LATEST, id); + wait_for_completion(&comp); + + /* Partition doesn't exist (or other error) */ + if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6) + return NULL; + + /* Fetch address and length from reply */ + addr = *((u16 *)cmd.buffer); + len = cmd.buffer[3] << 2; + /* Calucluate total length to allocate, including the 17 bytes + * for "sdb-partition-XX" that we append at the end of the buffer + */ + tlen = sizeof(struct property) + len + 18; + + prop = kcalloc(tlen, 1, GFP_KERNEL); + if (prop == NULL) + return NULL; + hdr = (struct smu_sdbp_header *)(prop + 1); + prop->name = ((char *)prop) + tlen - 18; + sprintf(prop->name, "sdb-partition-%02x", id); + prop->length = len; + prop->value = (unsigned char *)hdr; + prop->next = NULL; + + /* Read the datablock */ + if (smu_read_datablock((u8 *)hdr, addr, len)) { + printk(KERN_DEBUG "SMU: datablock read failed while reading " + "partition %02x !\n", id); + goto failure; + } + + /* Got it, check a few things and create the property */ + if (hdr->id != id) { + printk(KERN_DEBUG "SMU: Reading partition %02x and got " + "%02x !\n", id, hdr->id); + goto failure; + } + if (prom_add_property(smu->of_node, prop)) { + printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x " + "property !\n", id); + goto failure; + } + + return hdr; + failure: + kfree(prop); + return NULL; +} + +/* Note: Only allowed to return error code in pointers (using ERR_PTR) + * when interruptible is 1 + */ +struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size, + int interruptible) +{ + char pname[32]; + struct smu_sdbp_header *part; + + if (!smu) + return NULL; + + sprintf(pname, "sdb-partition-%02x", id); + + if (interruptible) { + int rc; + rc = down_interruptible(&smu_part_access); + if (rc) + return ERR_PTR(rc); + } else + down(&smu_part_access); + + part = (struct smu_sdbp_header *)get_property(smu->of_node, + pname, size); + if (part == NULL) { + part = smu_create_sdb_partition(id); + if (part != NULL && size) + *size = part->len << 2; + } + up(&smu_part_access); + return part; +} + +struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size) +{ + return __smu_get_sdb_partition(id, size, 0); +} +EXPORT_SYMBOL(smu_get_sdb_partition); /* @@ -918,6 +1072,14 @@ static ssize_t smu_write(struct file *file, const char __user *buf, else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) { pp->mode = smu_file_events; return 0; + } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) { + struct smu_sdbp_header *part; + part = __smu_get_sdb_partition(hdr.cmd, NULL, 1); + if (part == NULL) + return -EINVAL; + else if (IS_ERR(part)) + return PTR_ERR(part); + return 0; } else if (hdr.cmdtype != SMU_CMDTYPE_SMU) return -EINVAL; else if (pp->mode != smu_file_commands) diff --git a/drivers/macintosh/therm_pm72.c b/drivers/macintosh/therm_pm72.c index cc507ceef153..3fc8cdd94c3d 100644 --- a/drivers/macintosh/therm_pm72.c +++ b/drivers/macintosh/therm_pm72.c @@ -1678,10 +1678,9 @@ static int main_control_loop(void *x) } // FIXME: Deal with signals - set_current_state(TASK_INTERRUPTIBLE); elapsed = jiffies - start; if (elapsed < HZ) - schedule_timeout(HZ - elapsed); + schedule_timeout_interruptible(HZ - elapsed); } out: diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c index 9bc6cc6e3845..564043508569 100644 --- a/drivers/macintosh/via-pmu.c +++ b/drivers/macintosh/via-pmu.c @@ -2053,6 +2053,7 @@ pmu_register_sleep_notifier(struct pmu_sleep_notifier *n) __list_add(&n->list, list->prev, list); return 0; } +EXPORT_SYMBOL(pmu_register_sleep_notifier); int pmu_unregister_sleep_notifier(struct pmu_sleep_notifier* n) @@ -2063,6 +2064,7 @@ pmu_unregister_sleep_notifier(struct pmu_sleep_notifier* n) n->list.next = NULL; return 0; } +EXPORT_SYMBOL(pmu_unregister_sleep_notifier); #endif /* CONFIG_PM */ #if defined(CONFIG_PM) && defined(CONFIG_PPC32) @@ -2667,10 +2669,10 @@ powerbook_sleep_3400(void) asleep = 1; /* Put the CPU into sleep mode */ - asm volatile("mfspr %0,1008" : "=r" (hid0) :); + hid0 = mfspr(SPRN_HID0); hid0 = (hid0 & ~(HID0_NAP | HID0_DOZE)) | HID0_SLEEP; - asm volatile("mtspr 1008,%0" : : "r" (hid0)); - _nmask_and_or_msr(0, MSR_POW | MSR_EE); + mtspr(SPRN_HID0, hid0); + mtmsr(mfmsr() | MSR_POW | MSR_EE); udelay(10); /* OK, we're awake again, start restoring things */ @@ -3139,8 +3141,6 @@ EXPORT_SYMBOL(pmu_i2c_stdsub_write); EXPORT_SYMBOL(pmu_i2c_simple_read); EXPORT_SYMBOL(pmu_i2c_simple_write); #if defined(CONFIG_PM) && defined(CONFIG_PPC32) -EXPORT_SYMBOL(pmu_register_sleep_notifier); -EXPORT_SYMBOL(pmu_unregister_sleep_notifier); EXPORT_SYMBOL(pmu_enable_irled); EXPORT_SYMBOL(pmu_battery_count); EXPORT_SYMBOL(pmu_batteries); diff --git a/drivers/macintosh/windfarm.h b/drivers/macintosh/windfarm.h new file mode 100644 index 000000000000..3f0cb0312ea3 --- /dev/null +++ b/drivers/macintosh/windfarm.h @@ -0,0 +1,131 @@ +/* + * Windfarm PowerMac thermal control. + * + * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + * + * Released under the term of the GNU GPL v2. + */ + +#ifndef __WINDFARM_H__ +#define __WINDFARM_H__ + +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/notifier.h> + +/* Display a 16.16 fixed point value */ +#define FIX32TOPRINT(f) ((f) >> 16),((((f) & 0xffff) * 1000) >> 16) + +/* + * Control objects + */ + +struct wf_control; + +struct wf_control_ops { + int (*set_value)(struct wf_control *ct, s32 val); + int (*get_value)(struct wf_control *ct, s32 *val); + s32 (*get_min)(struct wf_control *ct); + s32 (*get_max)(struct wf_control *ct); + void (*release)(struct wf_control *ct); + struct module *owner; +}; + +struct wf_control { + struct list_head link; + struct wf_control_ops *ops; + char *name; + int type; + struct kref ref; +}; + +#define WF_CONTROL_TYPE_GENERIC 0 +#define WF_CONTROL_RPM_FAN 1 +#define WF_CONTROL_PWM_FAN 2 + + +/* Note about lifetime rules: wf_register_control() will initialize + * the kref and wf_unregister_control will decrement it, thus the + * object creating/disposing a given control shouldn't assume it + * still exists after wf_unregister_control has been called. + * wf_find_control will inc the refcount for you + */ +extern int wf_register_control(struct wf_control *ct); +extern void wf_unregister_control(struct wf_control *ct); +extern struct wf_control * wf_find_control(const char *name); +extern int wf_get_control(struct wf_control *ct); +extern void wf_put_control(struct wf_control *ct); + +static inline int wf_control_set_max(struct wf_control *ct) +{ + s32 vmax = ct->ops->get_max(ct); + return ct->ops->set_value(ct, vmax); +} + +static inline int wf_control_set_min(struct wf_control *ct) +{ + s32 vmin = ct->ops->get_min(ct); + return ct->ops->set_value(ct, vmin); +} + +/* + * Sensor objects + */ + +struct wf_sensor; + +struct wf_sensor_ops { + int (*get_value)(struct wf_sensor *sr, s32 *val); + void (*release)(struct wf_sensor *sr); + struct module *owner; +}; + +struct wf_sensor { + struct list_head link; + struct wf_sensor_ops *ops; + char *name; + struct kref ref; +}; + +/* Same lifetime rules as controls */ +extern int wf_register_sensor(struct wf_sensor *sr); +extern void wf_unregister_sensor(struct wf_sensor *sr); +extern struct wf_sensor * wf_find_sensor(const char *name); +extern int wf_get_sensor(struct wf_sensor *sr); +extern void wf_put_sensor(struct wf_sensor *sr); + +/* For use by clients. Note that we are a bit racy here since + * notifier_block doesn't have a module owner field. I may fix + * it one day ... + * + * LOCKING NOTE ! + * + * All "events" except WF_EVENT_TICK are called with an internal mutex + * held which will deadlock if you call basically any core routine. + * So don't ! Just take note of the event and do your actual operations + * from the ticker. + * + */ +extern int wf_register_client(struct notifier_block *nb); +extern int wf_unregister_client(struct notifier_block *nb); + +/* Overtemp conditions. Those are refcounted */ +extern void wf_set_overtemp(void); +extern void wf_clear_overtemp(void); +extern int wf_is_overtemp(void); + +#define WF_EVENT_NEW_CONTROL 0 /* param is wf_control * */ +#define WF_EVENT_NEW_SENSOR 1 /* param is wf_sensor * */ +#define WF_EVENT_OVERTEMP 2 /* no param */ +#define WF_EVENT_NORMALTEMP 3 /* overtemp condition cleared */ +#define WF_EVENT_TICK 4 /* 1 second tick */ + +/* Note: If that driver gets more broad use, we could replace the + * simplistic overtemp bits with "environmental conditions". That + * could then be used to also notify of things like fan failure, + * case open, battery conditions, ... + */ + +#endif /* __WINDFARM_H__ */ diff --git a/drivers/macintosh/windfarm_core.c b/drivers/macintosh/windfarm_core.c new file mode 100644 index 000000000000..6c2a471ea6c0 --- /dev/null +++ b/drivers/macintosh/windfarm_core.c @@ -0,0 +1,426 @@ +/* + * Windfarm PowerMac thermal control. Core + * + * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + * + * Released under the term of the GNU GPL v2. + * + * This core code tracks the list of sensors & controls, register + * clients, and holds the kernel thread used for control. + * + * TODO: + * + * Add some information about sensor/control type and data format to + * sensors/controls, and have the sysfs attribute stuff be moved + * generically here instead of hard coded in the platform specific + * driver as it us currently + * + * This however requires solving some annoying lifetime issues with + * sysfs which doesn't seem to have lifetime rules for struct attribute, + * I may have to create full features kobjects for every sensor/control + * instead which is a bit of an overkill imho + */ + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/smp_lock.h> +#include <linux/kthread.h> +#include <linux/jiffies.h> +#include <linux/reboot.h> +#include <linux/device.h> +#include <linux/platform_device.h> + +#include "windfarm.h" + +#define VERSION "0.2" + +#undef DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +static LIST_HEAD(wf_controls); +static LIST_HEAD(wf_sensors); +static DECLARE_MUTEX(wf_lock); +static struct notifier_block *wf_client_list; +static int wf_client_count; +static unsigned int wf_overtemp; +static unsigned int wf_overtemp_counter; +struct task_struct *wf_thread; + +/* + * Utilities & tick thread + */ + +static inline void wf_notify(int event, void *param) +{ + notifier_call_chain(&wf_client_list, event, param); +} + +int wf_critical_overtemp(void) +{ + static char * critical_overtemp_path = "/sbin/critical_overtemp"; + char *argv[] = { critical_overtemp_path, NULL }; + static char *envp[] = { "HOME=/", + "TERM=linux", + "PATH=/sbin:/usr/sbin:/bin:/usr/bin", + NULL }; + + return call_usermodehelper(critical_overtemp_path, argv, envp, 0); +} +EXPORT_SYMBOL_GPL(wf_critical_overtemp); + +static int wf_thread_func(void *data) +{ + unsigned long next, delay; + + next = jiffies; + + DBG("wf: thread started\n"); + + while(!kthread_should_stop()) { + try_to_freeze(); + + if (time_after_eq(jiffies, next)) { + wf_notify(WF_EVENT_TICK, NULL); + if (wf_overtemp) { + wf_overtemp_counter++; + /* 10 seconds overtemp, notify userland */ + if (wf_overtemp_counter > 10) + wf_critical_overtemp(); + /* 30 seconds, shutdown */ + if (wf_overtemp_counter > 30) { + printk(KERN_ERR "windfarm: Overtemp " + "for more than 30" + " seconds, shutting down\n"); + machine_power_off(); + } + } + next += HZ; + } + + delay = next - jiffies; + if (delay <= HZ) + schedule_timeout_interruptible(delay); + + /* there should be no signal, but oh well */ + if (signal_pending(current)) { + printk(KERN_WARNING "windfarm: thread got sigl !\n"); + break; + } + } + + DBG("wf: thread stopped\n"); + + return 0; +} + +static void wf_start_thread(void) +{ + wf_thread = kthread_run(wf_thread_func, NULL, "kwindfarm"); + if (IS_ERR(wf_thread)) { + printk(KERN_ERR "windfarm: failed to create thread,err %ld\n", + PTR_ERR(wf_thread)); + wf_thread = NULL; + } +} + + +static void wf_stop_thread(void) +{ + if (wf_thread) + kthread_stop(wf_thread); + wf_thread = NULL; +} + +/* + * Controls + */ + +static void wf_control_release(struct kref *kref) +{ + struct wf_control *ct = container_of(kref, struct wf_control, ref); + + DBG("wf: Deleting control %s\n", ct->name); + + if (ct->ops && ct->ops->release) + ct->ops->release(ct); + else + kfree(ct); +} + +int wf_register_control(struct wf_control *new_ct) +{ + struct wf_control *ct; + + down(&wf_lock); + list_for_each_entry(ct, &wf_controls, link) { + if (!strcmp(ct->name, new_ct->name)) { + printk(KERN_WARNING "windfarm: trying to register" + " duplicate control %s\n", ct->name); + up(&wf_lock); + return -EEXIST; + } + } + kref_init(&new_ct->ref); + list_add(&new_ct->link, &wf_controls); + + DBG("wf: Registered control %s\n", new_ct->name); + + wf_notify(WF_EVENT_NEW_CONTROL, new_ct); + up(&wf_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(wf_register_control); + +void wf_unregister_control(struct wf_control *ct) +{ + down(&wf_lock); + list_del(&ct->link); + up(&wf_lock); + + DBG("wf: Unregistered control %s\n", ct->name); + + kref_put(&ct->ref, wf_control_release); +} +EXPORT_SYMBOL_GPL(wf_unregister_control); + +struct wf_control * wf_find_control(const char *name) +{ + struct wf_control *ct; + + down(&wf_lock); + list_for_each_entry(ct, &wf_controls, link) { + if (!strcmp(ct->name, name)) { + if (wf_get_control(ct)) + ct = NULL; + up(&wf_lock); + return ct; + } + } + up(&wf_lock); + return NULL; +} +EXPORT_SYMBOL_GPL(wf_find_control); + +int wf_get_control(struct wf_control *ct) +{ + if (!try_module_get(ct->ops->owner)) + return -ENODEV; + kref_get(&ct->ref); + return 0; +} +EXPORT_SYMBOL_GPL(wf_get_control); + +void wf_put_control(struct wf_control *ct) +{ + struct module *mod = ct->ops->owner; + kref_put(&ct->ref, wf_control_release); + module_put(mod); +} +EXPORT_SYMBOL_GPL(wf_put_control); + + +/* + * Sensors + */ + + +static void wf_sensor_release(struct kref *kref) +{ + struct wf_sensor *sr = container_of(kref, struct wf_sensor, ref); + + DBG("wf: Deleting sensor %s\n", sr->name); + + if (sr->ops && sr->ops->release) + sr->ops->release(sr); + else + kfree(sr); +} + +int wf_register_sensor(struct wf_sensor *new_sr) +{ + struct wf_sensor *sr; + + down(&wf_lock); + list_for_each_entry(sr, &wf_sensors, link) { + if (!strcmp(sr->name, new_sr->name)) { + printk(KERN_WARNING "windfarm: trying to register" + " duplicate sensor %s\n", sr->name); + up(&wf_lock); + return -EEXIST; + } + } + kref_init(&new_sr->ref); + list_add(&new_sr->link, &wf_sensors); + + DBG("wf: Registered sensor %s\n", new_sr->name); + + wf_notify(WF_EVENT_NEW_SENSOR, new_sr); + up(&wf_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(wf_register_sensor); + +void wf_unregister_sensor(struct wf_sensor *sr) +{ + down(&wf_lock); + list_del(&sr->link); + up(&wf_lock); + + DBG("wf: Unregistered sensor %s\n", sr->name); + + wf_put_sensor(sr); +} +EXPORT_SYMBOL_GPL(wf_unregister_sensor); + +struct wf_sensor * wf_find_sensor(const char *name) +{ + struct wf_sensor *sr; + + down(&wf_lock); + list_for_each_entry(sr, &wf_sensors, link) { + if (!strcmp(sr->name, name)) { + if (wf_get_sensor(sr)) + sr = NULL; + up(&wf_lock); + return sr; + } + } + up(&wf_lock); + return NULL; +} +EXPORT_SYMBOL_GPL(wf_find_sensor); + +int wf_get_sensor(struct wf_sensor *sr) +{ + if (!try_module_get(sr->ops->owner)) + return -ENODEV; + kref_get(&sr->ref); + return 0; +} +EXPORT_SYMBOL_GPL(wf_get_sensor); + +void wf_put_sensor(struct wf_sensor *sr) +{ + struct module *mod = sr->ops->owner; + kref_put(&sr->ref, wf_sensor_release); + module_put(mod); +} +EXPORT_SYMBOL_GPL(wf_put_sensor); + + +/* + * Client & notification + */ + +int wf_register_client(struct notifier_block *nb) +{ + int rc; + struct wf_control *ct; + struct wf_sensor *sr; + + down(&wf_lock); + rc = notifier_chain_register(&wf_client_list, nb); + if (rc != 0) + goto bail; + wf_client_count++; + list_for_each_entry(ct, &wf_controls, link) + wf_notify(WF_EVENT_NEW_CONTROL, ct); + list_for_each_entry(sr, &wf_sensors, link) + wf_notify(WF_EVENT_NEW_SENSOR, sr); + if (wf_client_count == 1) + wf_start_thread(); + bail: + up(&wf_lock); + return rc; +} +EXPORT_SYMBOL_GPL(wf_register_client); + +int wf_unregister_client(struct notifier_block *nb) +{ + down(&wf_lock); + notifier_chain_unregister(&wf_client_list, nb); + wf_client_count++; + if (wf_client_count == 0) + wf_stop_thread(); + up(&wf_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(wf_unregister_client); + +void wf_set_overtemp(void) +{ + down(&wf_lock); + wf_overtemp++; + if (wf_overtemp == 1) { + printk(KERN_WARNING "windfarm: Overtemp condition detected !\n"); + wf_overtemp_counter = 0; + wf_notify(WF_EVENT_OVERTEMP, NULL); + } + up(&wf_lock); +} +EXPORT_SYMBOL_GPL(wf_set_overtemp); + +void wf_clear_overtemp(void) +{ + down(&wf_lock); + WARN_ON(wf_overtemp == 0); + if (wf_overtemp == 0) { + up(&wf_lock); + return; + } + wf_overtemp--; + if (wf_overtemp == 0) { + printk(KERN_WARNING "windfarm: Overtemp condition cleared !\n"); + wf_notify(WF_EVENT_NORMALTEMP, NULL); + } + up(&wf_lock); +} +EXPORT_SYMBOL_GPL(wf_clear_overtemp); + +int wf_is_overtemp(void) +{ + return (wf_overtemp != 0); +} +EXPORT_SYMBOL_GPL(wf_is_overtemp); + +static struct platform_device wf_platform_device = { + .name = "windfarm", +}; + +static int __init windfarm_core_init(void) +{ + DBG("wf: core loaded\n"); + + platform_device_register(&wf_platform_device); + return 0; +} + +static void __exit windfarm_core_exit(void) +{ + BUG_ON(wf_client_count != 0); + + DBG("wf: core unloaded\n"); + + platform_device_unregister(&wf_platform_device); +} + + +module_init(windfarm_core_init); +module_exit(windfarm_core_exit); + +MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); +MODULE_DESCRIPTION("Core component of PowerMac thermal control"); +MODULE_LICENSE("GPL"); + diff --git a/drivers/macintosh/windfarm_cpufreq_clamp.c b/drivers/macintosh/windfarm_cpufreq_clamp.c new file mode 100644 index 000000000000..607dbaca69c9 --- /dev/null +++ b/drivers/macintosh/windfarm_cpufreq_clamp.c @@ -0,0 +1,105 @@ +#include <linux/config.h> +#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/cpufreq.h> + +#include "windfarm.h" + +#define VERSION "0.3" + +static int clamped; +static struct wf_control *clamp_control; + +static int clamp_notifier_call(struct notifier_block *self, + unsigned long event, void *data) +{ + struct cpufreq_policy *p = data; + unsigned long max_freq; + + if (event != CPUFREQ_ADJUST) + return 0; + + max_freq = clamped ? (p->cpuinfo.min_freq) : (p->cpuinfo.max_freq); + cpufreq_verify_within_limits(p, 0, max_freq); + + return 0; +} + +static struct notifier_block clamp_notifier = { + .notifier_call = clamp_notifier_call, +}; + +static int clamp_set(struct wf_control *ct, s32 value) +{ + if (value) + printk(KERN_INFO "windfarm: Clamping CPU frequency to " + "minimum !\n"); + else + printk(KERN_INFO "windfarm: CPU frequency unclamped !\n"); + clamped = value; + cpufreq_update_policy(0); + return 0; +} + +static int clamp_get(struct wf_control *ct, s32 *value) +{ + *value = clamped; + return 0; +} + +static s32 clamp_min(struct wf_control *ct) +{ + return 0; +} + +static s32 clamp_max(struct wf_control *ct) +{ + return 1; +} + +static struct wf_control_ops clamp_ops = { + .set_value = clamp_set, + .get_value = clamp_get, + .get_min = clamp_min, + .get_max = clamp_max, + .owner = THIS_MODULE, +}; + +static int __init wf_cpufreq_clamp_init(void) +{ + struct wf_control *clamp; + + clamp = kmalloc(sizeof(struct wf_control), GFP_KERNEL); + if (clamp == NULL) + return -ENOMEM; + cpufreq_register_notifier(&clamp_notifier, CPUFREQ_POLICY_NOTIFIER); + clamp->ops = &clamp_ops; + clamp->name = "cpufreq-clamp"; + if (wf_register_control(clamp)) + goto fail; + clamp_control = clamp; + return 0; + fail: + kfree(clamp); + return -ENODEV; +} + +static void __exit wf_cpufreq_clamp_exit(void) +{ + if (clamp_control) + wf_unregister_control(clamp_control); +} + + +module_init(wf_cpufreq_clamp_init); +module_exit(wf_cpufreq_clamp_exit); + +MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); +MODULE_DESCRIPTION("CPU frequency clamp for PowerMacs thermal control"); +MODULE_LICENSE("GPL"); + diff --git a/drivers/macintosh/windfarm_lm75_sensor.c b/drivers/macintosh/windfarm_lm75_sensor.c new file mode 100644 index 000000000000..a0a41ad0f2b5 --- /dev/null +++ b/drivers/macintosh/windfarm_lm75_sensor.c @@ -0,0 +1,263 @@ +/* + * Windfarm PowerMac thermal control. LM75 sensor + * + * (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/i2c.h> +#include <linux/i2c-dev.h> +#include <asm/prom.h> +#include <asm/machdep.h> +#include <asm/io.h> +#include <asm/system.h> +#include <asm/sections.h> + +#include "windfarm.h" + +#define VERSION "0.1" + +#undef DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +struct wf_lm75_sensor { + int ds1775 : 1; + int inited : 1; + struct i2c_client i2c; + struct wf_sensor sens; +}; +#define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens) +#define i2c_to_lm75(c) container_of(c, struct wf_lm75_sensor, i2c) + +static int wf_lm75_attach(struct i2c_adapter *adapter); +static int wf_lm75_detach(struct i2c_client *client); + +static struct i2c_driver wf_lm75_driver = { + .owner = THIS_MODULE, + .name = "wf_lm75", + .flags = I2C_DF_NOTIFY, + .attach_adapter = wf_lm75_attach, + .detach_client = wf_lm75_detach, +}; + +static int wf_lm75_get(struct wf_sensor *sr, s32 *value) +{ + struct wf_lm75_sensor *lm = wf_to_lm75(sr); + s32 data; + + if (lm->i2c.adapter == NULL) + return -ENODEV; + + /* Init chip if necessary */ + if (!lm->inited) { + u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(&lm->i2c, 1); + + DBG("wf_lm75: Initializing %s, cfg was: %02x\n", + sr->name, cfg); + + /* clear shutdown bit, keep other settings as left by + * the firmware for now + */ + cfg_new = cfg & ~0x01; + i2c_smbus_write_byte_data(&lm->i2c, 1, cfg_new); + lm->inited = 1; + + /* If we just powered it up, let's wait 200 ms */ + msleep(200); + } + + /* Read temperature register */ + data = (s32)le16_to_cpu(i2c_smbus_read_word_data(&lm->i2c, 0)); + data <<= 8; + *value = data; + + return 0; +} + +static void wf_lm75_release(struct wf_sensor *sr) +{ + struct wf_lm75_sensor *lm = wf_to_lm75(sr); + + /* check if client is registered and detach from i2c */ + if (lm->i2c.adapter) { + i2c_detach_client(&lm->i2c); + lm->i2c.adapter = NULL; + } + + kfree(lm); +} + +static struct wf_sensor_ops wf_lm75_ops = { + .get_value = wf_lm75_get, + .release = wf_lm75_release, + .owner = THIS_MODULE, +}; + +static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter, + u8 addr, int ds1775, + const char *loc) +{ + struct wf_lm75_sensor *lm; + + DBG("wf_lm75: creating %s device at address 0x%02x\n", + ds1775 ? "ds1775" : "lm75", addr); + + lm = kmalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL); + if (lm == NULL) + return NULL; + memset(lm, 0, sizeof(struct wf_lm75_sensor)); + + /* Usual rant about sensor names not beeing very consistent in + * the device-tree, oh well ... + * Add more entries below as you deal with more setups + */ + if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY")) + lm->sens.name = "hd-temp"; + else + goto fail; + + lm->inited = 0; + lm->sens.ops = &wf_lm75_ops; + lm->ds1775 = ds1775; + lm->i2c.addr = (addr >> 1) & 0x7f; + lm->i2c.adapter = adapter; + lm->i2c.driver = &wf_lm75_driver; + strncpy(lm->i2c.name, lm->sens.name, I2C_NAME_SIZE-1); + + if (i2c_attach_client(&lm->i2c)) { + printk(KERN_ERR "windfarm: failed to attach %s %s to i2c\n", + ds1775 ? "ds1775" : "lm75", lm->i2c.name); + goto fail; + } + + if (wf_register_sensor(&lm->sens)) { + i2c_detach_client(&lm->i2c); + goto fail; + } + + return lm; + fail: + kfree(lm); + return NULL; +} + +static int wf_lm75_attach(struct i2c_adapter *adapter) +{ + u8 bus_id; + struct device_node *smu, *bus, *dev; + + /* We currently only deal with LM75's hanging off the SMU + * i2c busses. If we extend that driver to other/older + * machines, we should split this function into SMU-i2c, + * keywest-i2c, PMU-i2c, ... + */ + + DBG("wf_lm75: adapter %s detected\n", adapter->name); + + if (strncmp(adapter->name, "smu-i2c-", 8) != 0) + return 0; + smu = of_find_node_by_type(NULL, "smu"); + if (smu == NULL) + return 0; + + /* Look for the bus in the device-tree */ + bus_id = (u8)simple_strtoul(adapter->name + 8, NULL, 16); + + DBG("wf_lm75: bus ID is %x\n", bus_id); + + /* Look for sensors subdir */ + for (bus = NULL; + (bus = of_get_next_child(smu, bus)) != NULL;) { + u32 *reg; + + if (strcmp(bus->name, "i2c")) + continue; + reg = (u32 *)get_property(bus, "reg", NULL); + if (reg == NULL) + continue; + if (bus_id == *reg) + break; + } + of_node_put(smu); + if (bus == NULL) { + printk(KERN_WARNING "windfarm: SMU i2c bus 0x%x not found" + " in device-tree !\n", bus_id); + return 0; + } + + DBG("wf_lm75: bus found, looking for device...\n"); + + /* Now look for lm75(s) in there */ + for (dev = NULL; + (dev = of_get_next_child(bus, dev)) != NULL;) { + const char *loc = + get_property(dev, "hwsensor-location", NULL); + u32 *reg = (u32 *)get_property(dev, "reg", NULL); + DBG(" dev: %s... (loc: %p, reg: %p)\n", dev->name, loc, reg); + if (loc == NULL || reg == NULL) + continue; + /* real lm75 */ + if (device_is_compatible(dev, "lm75")) + wf_lm75_create(adapter, *reg, 0, loc); + /* ds1775 (compatible, better resolution */ + else if (device_is_compatible(dev, "ds1775")) + wf_lm75_create(adapter, *reg, 1, loc); + } + + of_node_put(bus); + + return 0; +} + +static int wf_lm75_detach(struct i2c_client *client) +{ + struct wf_lm75_sensor *lm = i2c_to_lm75(client); + + DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name); + + /* Mark client detached */ + lm->i2c.adapter = NULL; + + /* release sensor */ + wf_unregister_sensor(&lm->sens); + + return 0; +} + +static int __init wf_lm75_sensor_init(void) +{ + int rc; + + rc = i2c_add_driver(&wf_lm75_driver); + if (rc < 0) + return rc; + return 0; +} + +static void __exit wf_lm75_sensor_exit(void) +{ + i2c_del_driver(&wf_lm75_driver); +} + + +module_init(wf_lm75_sensor_init); +module_exit(wf_lm75_sensor_exit); + +MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); +MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control"); +MODULE_LICENSE("GPL"); + diff --git a/drivers/macintosh/windfarm_pid.c b/drivers/macintosh/windfarm_pid.c new file mode 100644 index 000000000000..2e803b368757 --- /dev/null +++ b/drivers/macintosh/windfarm_pid.c @@ -0,0 +1,145 @@ +/* + * Windfarm PowerMac thermal control. Generic PID helpers + * + * (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/string.h> +#include <linux/module.h> + +#include "windfarm_pid.h" + +#undef DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +void wf_pid_init(struct wf_pid_state *st, struct wf_pid_param *param) +{ + memset(st, 0, sizeof(struct wf_pid_state)); + st->param = *param; + st->first = 1; +} +EXPORT_SYMBOL_GPL(wf_pid_init); + +s32 wf_pid_run(struct wf_pid_state *st, s32 new_sample) +{ + s64 error, integ, deriv; + s32 target; + int i, hlen = st->param.history_len; + + /* Calculate error term */ + error = new_sample - st->param.itarget; + + /* Get samples into our history buffer */ + if (st->first) { + for (i = 0; i < hlen; i++) { + st->samples[i] = new_sample; + st->errors[i] = error; + } + st->first = 0; + st->index = 0; + } else { + st->index = (st->index + 1) % hlen; + st->samples[st->index] = new_sample; + st->errors[st->index] = error; + } + + /* Calculate integral term */ + for (i = 0, integ = 0; i < hlen; i++) + integ += st->errors[(st->index + hlen - i) % hlen]; + integ *= st->param.interval; + + /* Calculate derivative term */ + deriv = st->errors[st->index] - + st->errors[(st->index + hlen - 1) % hlen]; + deriv /= st->param.interval; + + /* Calculate target */ + target = (s32)((integ * (s64)st->param.gr + deriv * (s64)st->param.gd + + error * (s64)st->param.gp) >> 36); + if (st->param.additive) + target += st->target; + target = max(target, st->param.min); + target = min(target, st->param.max); + st->target = target; + + return st->target; +} +EXPORT_SYMBOL_GPL(wf_pid_run); + +void wf_cpu_pid_init(struct wf_cpu_pid_state *st, + struct wf_cpu_pid_param *param) +{ + memset(st, 0, sizeof(struct wf_cpu_pid_state)); + st->param = *param; + st->first = 1; +} +EXPORT_SYMBOL_GPL(wf_cpu_pid_init); + +s32 wf_cpu_pid_run(struct wf_cpu_pid_state *st, s32 new_power, s32 new_temp) +{ + s64 error, integ, deriv, prop; + s32 target, sval, adj; + int i, hlen = st->param.history_len; + + /* Calculate error term */ + error = st->param.pmaxadj - new_power; + + /* Get samples into our history buffer */ + if (st->first) { + for (i = 0; i < hlen; i++) { + st->powers[i] = new_power; + st->errors[i] = error; + } + st->temps[0] = st->temps[1] = new_temp; + st->first = 0; + st->index = st->tindex = 0; + } else { + st->index = (st->index + 1) % hlen; + st->powers[st->index] = new_power; + st->errors[st->index] = error; + st->tindex = (st->tindex + 1) % 2; + st->temps[st->tindex] = new_temp; + } + + /* Calculate integral term */ + for (i = 0, integ = 0; i < hlen; i++) + integ += st->errors[(st->index + hlen - i) % hlen]; + integ *= st->param.interval; + integ *= st->param.gr; + sval = st->param.tmax - ((integ >> 20) & 0xffffffff); + adj = min(st->param.ttarget, sval); + + DBG("integ: %lx, sval: %lx, adj: %lx\n", integ, sval, adj); + + /* Calculate derivative term */ + deriv = st->temps[st->tindex] - + st->temps[(st->tindex + 2 - 1) % 2]; + deriv /= st->param.interval; + deriv *= st->param.gd; + + /* Calculate proportional term */ + prop = (new_temp - adj); + prop *= st->param.gp; + + DBG("deriv: %lx, prop: %lx\n", deriv, prop); + + /* Calculate target */ + target = st->target + (s32)((deriv + prop) >> 36); + target = max(target, st->param.min); + target = min(target, st->param.max); + st->target = target; + + return st->target; +} +EXPORT_SYMBOL_GPL(wf_cpu_pid_run); diff --git a/drivers/macintosh/windfarm_pid.h b/drivers/macintosh/windfarm_pid.h new file mode 100644 index 000000000000..a364c2a2499c --- /dev/null +++ b/drivers/macintosh/windfarm_pid.h @@ -0,0 +1,84 @@ +/* + * Windfarm PowerMac thermal control. Generic PID helpers + * + * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + * + * Released under the term of the GNU GPL v2. + * + * This is a pair of generic PID helpers that can be used by + * control loops. One is the basic PID implementation, the + * other one is more specifically tailored to the loops used + * for CPU control with 2 input sample types (temp and power) + */ + +/* + * *** Simple PID *** + */ + +#define WF_PID_MAX_HISTORY 32 + +/* This parameter array is passed to the PID algorithm. Currently, + * we don't support changing parameters on the fly as it's not needed + * but could be implemented (with necessary adjustment of the history + * buffer + */ +struct wf_pid_param { + int interval; /* Interval between samples in seconds */ + int history_len; /* Size of history buffer */ + int additive; /* 1: target relative to previous value */ + s32 gd, gp, gr; /* PID gains */ + s32 itarget; /* PID input target */ + s32 min,max; /* min and max target values */ +}; + +struct wf_pid_state { + int first; /* first run of the loop */ + int index; /* index of current sample */ + s32 target; /* current target value */ + s32 samples[WF_PID_MAX_HISTORY]; /* samples history buffer */ + s32 errors[WF_PID_MAX_HISTORY]; /* error history buffer */ + + struct wf_pid_param param; +}; + +extern void wf_pid_init(struct wf_pid_state *st, struct wf_pid_param *param); +extern s32 wf_pid_run(struct wf_pid_state *st, s32 sample); + + +/* + * *** CPU PID *** + */ + +#define WF_CPU_PID_MAX_HISTORY 32 + +/* This parameter array is passed to the CPU PID algorithm. Currently, + * we don't support changing parameters on the fly as it's not needed + * but could be implemented (with necessary adjustment of the history + * buffer + */ +struct wf_cpu_pid_param { + int interval; /* Interval between samples in seconds */ + int history_len; /* Size of history buffer */ + s32 gd, gp, gr; /* PID gains */ + s32 pmaxadj; /* PID max power adjust */ + s32 ttarget; /* PID input target */ + s32 tmax; /* PID input max */ + s32 min,max; /* min and max target values */ +}; + +struct wf_cpu_pid_state { + int first; /* first run of the loop */ + int index; /* index of current power */ + int tindex; /* index of current temp */ + s32 target; /* current target value */ + s32 powers[WF_PID_MAX_HISTORY]; /* power history buffer */ + s32 errors[WF_PID_MAX_HISTORY]; /* error history buffer */ + s32 temps[2]; /* temp. history buffer */ + + struct wf_cpu_pid_param param; +}; + +extern void wf_cpu_pid_init(struct wf_cpu_pid_state *st, + struct wf_cpu_pid_param *param); +extern s32 wf_cpu_pid_run(struct wf_cpu_pid_state *st, s32 power, s32 temp); diff --git a/drivers/macintosh/windfarm_pm81.c b/drivers/macintosh/windfarm_pm81.c new file mode 100644 index 000000000000..322c74b2687f --- /dev/null +++ b/drivers/macintosh/windfarm_pm81.c @@ -0,0 +1,879 @@ +/* + * Windfarm PowerMac thermal control. iMac G5 + * + * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + * + * Released under the term of the GNU GPL v2. + * + * The algorithm used is the PID control algorithm, used the same + * way the published Darwin code does, using the same values that + * are present in the Darwin 8.2 snapshot property lists (note however + * that none of the code has been re-used, it's a complete re-implementation + * + * The various control loops found in Darwin config file are: + * + * PowerMac8,1 and PowerMac8,2 + * =========================== + * + * System Fans control loop. Different based on models. In addition to the + * usual PID algorithm, the control loop gets 2 additional pairs of linear + * scaling factors (scale/offsets) expressed as 4.12 fixed point values + * signed offset, unsigned scale) + * + * The targets are modified such as: + * - the linked control (second control) gets the target value as-is + * (typically the drive fan) + * - the main control (first control) gets the target value scaled with + * the first pair of factors, and is then modified as below + * - the value of the target of the CPU Fan control loop is retreived, + * scaled with the second pair of factors, and the max of that and + * the scaled target is applied to the main control. + * + * # model_id: 2 + * controls : system-fan, drive-bay-fan + * sensors : hd-temp + * PID params : G_d = 0x15400000 + * G_p = 0x00200000 + * G_r = 0x000002fd + * History = 2 entries + * Input target = 0x3a0000 + * Interval = 5s + * linear-factors : offset = 0xff38 scale = 0x0ccd + * offset = 0x0208 scale = 0x07ae + * + * # model_id: 3 + * controls : system-fan, drive-bay-fan + * sensors : hd-temp + * PID params : G_d = 0x08e00000 + * G_p = 0x00566666 + * G_r = 0x0000072b + * History = 2 entries + * Input target = 0x350000 + * Interval = 5s + * linear-factors : offset = 0xff38 scale = 0x0ccd + * offset = 0x0000 scale = 0x0000 + * + * # model_id: 5 + * controls : system-fan + * sensors : hd-temp + * PID params : G_d = 0x15400000 + * G_p = 0x00233333 + * G_r = 0x000002fd + * History = 2 entries + * Input target = 0x3a0000 + * Interval = 5s + * linear-factors : offset = 0x0000 scale = 0x1000 + * offset = 0x0091 scale = 0x0bae + * + * CPU Fan control loop. The loop is identical for all models. it + * has an additional pair of scaling factor. This is used to scale the + * systems fan control loop target result (the one before it gets scaled + * by the System Fans control loop itself). Then, the max value of the + * calculated target value and system fan value is sent to the fans + * + * controls : cpu-fan + * sensors : cpu-temp cpu-power + * PID params : From SMU sdb partition + * linear-factors : offset = 0xfb50 scale = 0x1000 + * + * CPU Slew control loop. Not implemented. The cpufreq driver in linux is + * completely separate for now, though we could find a way to link it, either + * as a client reacting to overtemp notifications, or directling monitoring + * the CPU temperature + * + * WARNING ! The CPU control loop requires the CPU tmax for the current + * operating point. However, we currently are completely separated from + * the cpufreq driver and thus do not know what the current operating + * point is. Fortunately, we also do not have any hardware supporting anything + * but operating point 0 at the moment, thus we just peek that value directly + * from the SDB partition. If we ever end up with actually slewing the system + * clock and thus changing operating points, we'll have to find a way to + * communicate with the CPU freq driver; + * + */ + +#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/spinlock.h> +#include <linux/wait.h> +#include <linux/kmod.h> +#include <linux/device.h> +#include <linux/platform_device.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" +#include "windfarm_pid.h" + +#define VERSION "0.4" + +#undef DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +/* define this to force CPU overtemp to 74 degree, useful for testing + * the overtemp code + */ +#undef HACKED_OVERTEMP + +static int wf_smu_mach_model; /* machine model id */ + +static struct device *wf_smu_dev; + +/* Controls & sensors */ +static struct wf_sensor *sensor_cpu_power; +static struct wf_sensor *sensor_cpu_temp; +static struct wf_sensor *sensor_hd_temp; +static struct wf_control *fan_cpu_main; +static struct wf_control *fan_hd; +static struct wf_control *fan_system; +static struct wf_control *cpufreq_clamp; + +/* Set to kick the control loop into life */ +static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started; + +/* Failure handling.. could be nicer */ +#define FAILURE_FAN 0x01 +#define FAILURE_SENSOR 0x02 +#define FAILURE_OVERTEMP 0x04 + +static unsigned int wf_smu_failure_state; +static int wf_smu_readjust, wf_smu_skipping; + +/* + * ****** System Fans Control Loop ****** + * + */ + +/* Parameters for the System Fans control loop. Parameters + * not in this table such as interval, history size, ... + * are common to all versions and thus hard coded for now. + */ +struct wf_smu_sys_fans_param { + int model_id; + s32 itarget; + s32 gd, gp, gr; + + s16 offset0; + u16 scale0; + s16 offset1; + u16 scale1; +}; + +#define WF_SMU_SYS_FANS_INTERVAL 5 +#define WF_SMU_SYS_FANS_HISTORY_SIZE 2 + +/* State data used by the system fans control loop + */ +struct wf_smu_sys_fans_state { + int ticks; + s32 sys_setpoint; + s32 hd_setpoint; + s16 offset0; + u16 scale0; + s16 offset1; + u16 scale1; + struct wf_pid_state pid; +}; + +/* + * Configs for SMU Sytem Fan control loop + */ +static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = { + /* Model ID 2 */ + { + .model_id = 2, + .itarget = 0x3a0000, + .gd = 0x15400000, + .gp = 0x00200000, + .gr = 0x000002fd, + .offset0 = 0xff38, + .scale0 = 0x0ccd, + .offset1 = 0x0208, + .scale1 = 0x07ae, + }, + /* Model ID 3 */ + { + .model_id = 2, + .itarget = 0x350000, + .gd = 0x08e00000, + .gp = 0x00566666, + .gr = 0x0000072b, + .offset0 = 0xff38, + .scale0 = 0x0ccd, + .offset1 = 0x0000, + .scale1 = 0x0000, + }, + /* Model ID 5 */ + { + .model_id = 2, + .itarget = 0x3a0000, + .gd = 0x15400000, + .gp = 0x00233333, + .gr = 0x000002fd, + .offset0 = 0x0000, + .scale0 = 0x1000, + .offset1 = 0x0091, + .scale1 = 0x0bae, + }, +}; +#define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params) + +static struct wf_smu_sys_fans_state *wf_smu_sys_fans; + +/* + * ****** CPU Fans Control Loop ****** + * + */ + + +#define WF_SMU_CPU_FANS_INTERVAL 1 +#define WF_SMU_CPU_FANS_MAX_HISTORY 16 +#define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000 +#define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50 + +/* State data used by the cpu fans control loop + */ +struct wf_smu_cpu_fans_state { + int ticks; + s32 cpu_setpoint; + s32 scale; + s32 offset; + struct wf_cpu_pid_state pid; +}; + +static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; + + + +/* + * ***** Implementation ***** + * + */ + +static void wf_smu_create_sys_fans(void) +{ + struct wf_smu_sys_fans_param *param = NULL; + struct wf_pid_param pid_param; + int i; + + /* First, locate the params for this model */ + for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++) + if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) { + param = &wf_smu_sys_all_params[i]; + break; + } + + /* No params found, put fans to max */ + if (param == NULL) { + printk(KERN_WARNING "windfarm: System fan config not found " + "for this machine model, max fan speed\n"); + goto fail; + } + + /* Alloc & initialize state */ + wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state), + GFP_KERNEL); + if (wf_smu_sys_fans == NULL) { + printk(KERN_WARNING "windfarm: Memory allocation error" + " max fan speed\n"); + goto fail; + } + wf_smu_sys_fans->ticks = 1; + wf_smu_sys_fans->scale0 = param->scale0; + wf_smu_sys_fans->offset0 = param->offset0; + wf_smu_sys_fans->scale1 = param->scale1; + wf_smu_sys_fans->offset1 = param->offset1; + + /* Fill PID params */ + pid_param.gd = param->gd; + pid_param.gp = param->gp; + pid_param.gr = param->gr; + pid_param.interval = WF_SMU_SYS_FANS_INTERVAL; + pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE; + pid_param.itarget = param->itarget; + pid_param.min = fan_system->ops->get_min(fan_system); + pid_param.max = fan_system->ops->get_max(fan_system); + if (fan_hd) { + pid_param.min = + max(pid_param.min,fan_hd->ops->get_min(fan_hd)); + pid_param.max = + min(pid_param.max,fan_hd->ops->get_max(fan_hd)); + } + wf_pid_init(&wf_smu_sys_fans->pid, &pid_param); + + DBG("wf: System Fan control initialized.\n"); + DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", + FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max); + return; + + fail: + + if (fan_system) + wf_control_set_max(fan_system); + if (fan_hd) + wf_control_set_max(fan_hd); +} + +static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st) +{ + s32 new_setpoint, temp, scaled, cputarget; + int rc; + + if (--st->ticks != 0) { + if (wf_smu_readjust) + goto readjust; + return; + } + st->ticks = WF_SMU_SYS_FANS_INTERVAL; + + rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp); + if (rc) { + printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n", + FIX32TOPRINT(temp)); + + if (temp > (st->pid.param.itarget + 0x50000)) + wf_smu_failure_state |= FAILURE_OVERTEMP; + + new_setpoint = wf_pid_run(&st->pid, temp); + + DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); + + scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0; + + DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled); + + cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0; + cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1; + scaled = max(scaled, cputarget); + scaled = max(scaled, st->pid.param.min); + scaled = min(scaled, st->pid.param.max); + + DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled); + + if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint) + return; + st->sys_setpoint = scaled; + st->hd_setpoint = new_setpoint; + readjust: + if (fan_system && wf_smu_failure_state == 0) { + rc = fan_system->ops->set_value(fan_system, st->sys_setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: Sys fan error %d\n", + rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } + if (fan_hd && wf_smu_failure_state == 0) { + rc = fan_hd->ops->set_value(fan_hd, st->hd_setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: HD fan error %d\n", + rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } +} + +static void wf_smu_create_cpu_fans(void) +{ + struct wf_cpu_pid_param pid_param; + struct smu_sdbp_header *hdr; + struct smu_sdbp_cpupiddata *piddata; + struct smu_sdbp_fvt *fvt; + s32 tmax, tdelta, maxpow, powadj; + + /* First, locate the PID params in SMU SBD */ + hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); + if (hdr == 0) { + printk(KERN_WARNING "windfarm: CPU PID fan config not found " + "max fan speed\n"); + goto fail; + } + piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; + + /* Get the FVT params for operating point 0 (the only supported one + * for now) in order to get tmax + */ + hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); + if (hdr) { + fvt = (struct smu_sdbp_fvt *)&hdr[1]; + tmax = ((s32)fvt->maxtemp) << 16; + } else + tmax = 0x5e0000; /* 94 degree default */ + + /* Alloc & initialize state */ + wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), + GFP_KERNEL); + if (wf_smu_cpu_fans == NULL) + goto fail; + wf_smu_cpu_fans->ticks = 1; + + wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE; + wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET; + + /* Fill PID params */ + pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; + pid_param.history_len = piddata->history_len; + if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { + printk(KERN_WARNING "windfarm: History size overflow on " + "CPU control loop (%d)\n", piddata->history_len); + pid_param.history_len = WF_CPU_PID_MAX_HISTORY; + } + pid_param.gd = piddata->gd; + pid_param.gp = piddata->gp; + pid_param.gr = piddata->gr / pid_param.history_len; + + tdelta = ((s32)piddata->target_temp_delta) << 16; + maxpow = ((s32)piddata->max_power) << 16; + powadj = ((s32)piddata->power_adj) << 16; + + pid_param.tmax = tmax; + pid_param.ttarget = tmax - tdelta; + pid_param.pmaxadj = maxpow - powadj; + + pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main); + pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main); + + wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); + + DBG("wf: CPU Fan control initialized.\n"); + DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", + FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), + pid_param.min, pid_param.max); + + return; + + fail: + printk(KERN_WARNING "windfarm: CPU fan config not found\n" + "for this machine model, max fan speed\n"); + + if (cpufreq_clamp) + wf_control_set_max(cpufreq_clamp); + if (fan_cpu_main) + wf_control_set_max(fan_cpu_main); +} + +static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) +{ + s32 new_setpoint, temp, power, systarget; + int rc; + + if (--st->ticks != 0) { + if (wf_smu_readjust) + goto readjust; + return; + } + st->ticks = WF_SMU_CPU_FANS_INTERVAL; + + rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); + if (rc) { + printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); + if (rc) { + printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", + FIX32TOPRINT(temp), FIX32TOPRINT(power)); + +#ifdef HACKED_OVERTEMP + if (temp > 0x4a0000) + wf_smu_failure_state |= FAILURE_OVERTEMP; +#else + if (temp > st->pid.param.tmax) + wf_smu_failure_state |= FAILURE_OVERTEMP; +#endif + new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); + + DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); + + systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0; + systarget = ((((s64)systarget) * (s64)st->scale) >> 12) + + st->offset; + new_setpoint = max(new_setpoint, systarget); + new_setpoint = max(new_setpoint, st->pid.param.min); + new_setpoint = min(new_setpoint, st->pid.param.max); + + DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint); + + if (st->cpu_setpoint == new_setpoint) + return; + st->cpu_setpoint = new_setpoint; + readjust: + if (fan_cpu_main && wf_smu_failure_state == 0) { + rc = fan_cpu_main->ops->set_value(fan_cpu_main, + st->cpu_setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: CPU main fan" + " error %d\n", rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } +} + + +/* + * ****** Attributes ****** + * + */ + +#define BUILD_SHOW_FUNC_FIX(name, data) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + ssize_t r; \ + s32 val = 0; \ + data->ops->get_value(data, &val); \ + r = sprintf(buf, "%d.%03d", FIX32TOPRINT(val)); \ + return r; \ +} \ +static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL); + + +#define BUILD_SHOW_FUNC_INT(name, data) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + s32 val = 0; \ + data->ops->get_value(data, &val); \ + return sprintf(buf, "%d", val); \ +} \ +static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL); + +BUILD_SHOW_FUNC_INT(cpu_fan, fan_cpu_main); +BUILD_SHOW_FUNC_INT(sys_fan, fan_system); +BUILD_SHOW_FUNC_INT(hd_fan, fan_hd); + +BUILD_SHOW_FUNC_FIX(cpu_temp, sensor_cpu_temp); +BUILD_SHOW_FUNC_FIX(cpu_power, sensor_cpu_power); +BUILD_SHOW_FUNC_FIX(hd_temp, sensor_hd_temp); + +/* + * ****** Setup / Init / Misc ... ****** + * + */ + +static void wf_smu_tick(void) +{ + unsigned int last_failure = wf_smu_failure_state; + unsigned int new_failure; + + if (!wf_smu_started) { + DBG("wf: creating control loops !\n"); + wf_smu_create_sys_fans(); + wf_smu_create_cpu_fans(); + wf_smu_started = 1; + } + + /* Skipping ticks */ + if (wf_smu_skipping && --wf_smu_skipping) + return; + + wf_smu_failure_state = 0; + if (wf_smu_sys_fans) + wf_smu_sys_fans_tick(wf_smu_sys_fans); + if (wf_smu_cpu_fans) + wf_smu_cpu_fans_tick(wf_smu_cpu_fans); + + wf_smu_readjust = 0; + new_failure = wf_smu_failure_state & ~last_failure; + + /* If entering failure mode, clamp cpufreq and ramp all + * fans to full speed. + */ + if (wf_smu_failure_state && !last_failure) { + if (cpufreq_clamp) + wf_control_set_max(cpufreq_clamp); + if (fan_system) + wf_control_set_max(fan_system); + if (fan_cpu_main) + wf_control_set_max(fan_cpu_main); + if (fan_hd) + wf_control_set_max(fan_hd); + } + + /* If leaving failure mode, unclamp cpufreq and readjust + * all fans on next iteration + */ + if (!wf_smu_failure_state && last_failure) { + if (cpufreq_clamp) + wf_control_set_min(cpufreq_clamp); + wf_smu_readjust = 1; + } + + /* Overtemp condition detected, notify and start skipping a couple + * ticks to let the temperature go down + */ + if (new_failure & FAILURE_OVERTEMP) { + wf_set_overtemp(); + wf_smu_skipping = 2; + } + + /* We only clear the overtemp condition if overtemp is cleared + * _and_ no other failure is present. Since a sensor error will + * clear the overtemp condition (can't measure temperature) at + * the control loop levels, but we don't want to keep it clear + * here in this case + */ + if (new_failure == 0 && last_failure & FAILURE_OVERTEMP) + wf_clear_overtemp(); +} + +static void wf_smu_new_control(struct wf_control *ct) +{ + if (wf_smu_all_controls_ok) + return; + + if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) { + if (wf_get_control(ct) == 0) { + fan_cpu_main = ct; + device_create_file(wf_smu_dev, &dev_attr_cpu_fan); + } + } + + if (fan_system == NULL && !strcmp(ct->name, "system-fan")) { + if (wf_get_control(ct) == 0) { + fan_system = ct; + device_create_file(wf_smu_dev, &dev_attr_sys_fan); + } + } + + if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { + if (wf_get_control(ct) == 0) + cpufreq_clamp = ct; + } + + /* Darwin property list says the HD fan is only for model ID + * 0, 1, 2 and 3 + */ + + if (wf_smu_mach_model > 3) { + if (fan_system && fan_cpu_main && cpufreq_clamp) + wf_smu_all_controls_ok = 1; + return; + } + + if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { + if (wf_get_control(ct) == 0) { + fan_hd = ct; + device_create_file(wf_smu_dev, &dev_attr_hd_fan); + } + } + + if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp) + wf_smu_all_controls_ok = 1; +} + +static void wf_smu_new_sensor(struct wf_sensor *sr) +{ + if (wf_smu_all_sensors_ok) + return; + + if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { + if (wf_get_sensor(sr) == 0) { + sensor_cpu_power = sr; + device_create_file(wf_smu_dev, &dev_attr_cpu_power); + } + } + + if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { + if (wf_get_sensor(sr) == 0) { + sensor_cpu_temp = sr; + device_create_file(wf_smu_dev, &dev_attr_cpu_temp); + } + } + + if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { + if (wf_get_sensor(sr) == 0) { + sensor_hd_temp = sr; + device_create_file(wf_smu_dev, &dev_attr_hd_temp); + } + } + + if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp) + wf_smu_all_sensors_ok = 1; +} + + +static int wf_smu_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + switch(event) { + case WF_EVENT_NEW_CONTROL: + DBG("wf: new control %s detected\n", + ((struct wf_control *)data)->name); + wf_smu_new_control(data); + wf_smu_readjust = 1; + break; + case WF_EVENT_NEW_SENSOR: + DBG("wf: new sensor %s detected\n", + ((struct wf_sensor *)data)->name); + wf_smu_new_sensor(data); + break; + case WF_EVENT_TICK: + if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) + wf_smu_tick(); + } + + return 0; +} + +static struct notifier_block wf_smu_events = { + .notifier_call = wf_smu_notify, +}; + +static int wf_init_pm(void) +{ + struct smu_sdbp_header *hdr; + + hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); + if (hdr != 0) { + struct smu_sdbp_sensortree *st = + (struct smu_sdbp_sensortree *)&hdr[1]; + wf_smu_mach_model = st->model_id; + } + + printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n", + wf_smu_mach_model); + + return 0; +} + +static int wf_smu_probe(struct device *ddev) +{ + wf_smu_dev = ddev; + + wf_register_client(&wf_smu_events); + + return 0; +} + +static int wf_smu_remove(struct device *ddev) +{ + wf_unregister_client(&wf_smu_events); + + /* XXX We don't have yet a guarantee that our callback isn't + * in progress when returning from wf_unregister_client, so + * we add an arbitrary delay. I'll have to fix that in the core + */ + msleep(1000); + + /* Release all sensors */ + /* One more crappy race: I don't think we have any guarantee here + * that the attribute callback won't race with the sensor beeing + * disposed of, and I'm not 100% certain what best way to deal + * with that except by adding locks all over... I'll do that + * eventually but heh, who ever rmmod this module anyway ? + */ + if (sensor_cpu_power) { + device_remove_file(wf_smu_dev, &dev_attr_cpu_power); + wf_put_sensor(sensor_cpu_power); + } + if (sensor_cpu_temp) { + device_remove_file(wf_smu_dev, &dev_attr_cpu_temp); + wf_put_sensor(sensor_cpu_temp); + } + if (sensor_hd_temp) { + device_remove_file(wf_smu_dev, &dev_attr_hd_temp); + wf_put_sensor(sensor_hd_temp); + } + + /* Release all controls */ + if (fan_cpu_main) { + device_remove_file(wf_smu_dev, &dev_attr_cpu_fan); + wf_put_control(fan_cpu_main); + } + if (fan_hd) { + device_remove_file(wf_smu_dev, &dev_attr_hd_fan); + wf_put_control(fan_hd); + } + if (fan_system) { + device_remove_file(wf_smu_dev, &dev_attr_sys_fan); + wf_put_control(fan_system); + } + if (cpufreq_clamp) + wf_put_control(cpufreq_clamp); + + /* Destroy control loops state structures */ + if (wf_smu_sys_fans) + kfree(wf_smu_sys_fans); + if (wf_smu_cpu_fans) + kfree(wf_smu_cpu_fans); + + wf_smu_dev = NULL; + + return 0; +} + +static struct device_driver wf_smu_driver = { + .name = "windfarm", + .bus = &platform_bus_type, + .probe = wf_smu_probe, + .remove = wf_smu_remove, +}; + + +static int __init wf_smu_init(void) +{ + int rc = -ENODEV; + + if (machine_is_compatible("PowerMac8,1") || + machine_is_compatible("PowerMac8,2")) + rc = wf_init_pm(); + + if (rc == 0) { +#ifdef MODULE + request_module("windfarm_smu_controls"); + request_module("windfarm_smu_sensors"); + request_module("windfarm_lm75_sensor"); + +#endif /* MODULE */ + driver_register(&wf_smu_driver); + } + + return rc; +} + +static void __exit wf_smu_exit(void) +{ + + driver_unregister(&wf_smu_driver); +} + + +module_init(wf_smu_init); +module_exit(wf_smu_exit); + +MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); +MODULE_DESCRIPTION("Thermal control logic for iMac G5"); +MODULE_LICENSE("GPL"); + diff --git a/drivers/macintosh/windfarm_pm91.c b/drivers/macintosh/windfarm_pm91.c new file mode 100644 index 000000000000..43243cf7410b --- /dev/null +++ b/drivers/macintosh/windfarm_pm91.c @@ -0,0 +1,814 @@ +/* + * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops + * + * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + * + * Released under the term of the GNU GPL v2. + * + * The algorithm used is the PID control algorithm, used the same + * way the published Darwin code does, using the same values that + * are present in the Darwin 8.2 snapshot property lists (note however + * that none of the code has been re-used, it's a complete re-implementation + * + * The various control loops found in Darwin config file are: + * + * PowerMac9,1 + * =========== + * + * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't + * try to play with other control loops fans). Drive bay is rather basic PID + * with one sensor and one fan. Slots area is a bit different as the Darwin + * driver is supposed to be capable of working in a special "AGP" mode which + * involves the presence of an AGP sensor and an AGP fan (possibly on the + * AGP card itself). I can't deal with that special mode as I don't have + * access to those additional sensor/fans for now (though ultimately, it would + * be possible to add sensor objects for them) so I'm only implementing the + * basic PCI slot control loop + */ + +#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/spinlock.h> +#include <linux/wait.h> +#include <linux/kmod.h> +#include <linux/device.h> +#include <linux/platform_device.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" +#include "windfarm_pid.h" + +#define VERSION "0.4" + +#undef DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +/* define this to force CPU overtemp to 74 degree, useful for testing + * the overtemp code + */ +#undef HACKED_OVERTEMP + +static struct device *wf_smu_dev; + +/* Controls & sensors */ +static struct wf_sensor *sensor_cpu_power; +static struct wf_sensor *sensor_cpu_temp; +static struct wf_sensor *sensor_hd_temp; +static struct wf_sensor *sensor_slots_power; +static struct wf_control *fan_cpu_main; +static struct wf_control *fan_cpu_second; +static struct wf_control *fan_cpu_third; +static struct wf_control *fan_hd; +static struct wf_control *fan_slots; +static struct wf_control *cpufreq_clamp; + +/* Set to kick the control loop into life */ +static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started; + +/* Failure handling.. could be nicer */ +#define FAILURE_FAN 0x01 +#define FAILURE_SENSOR 0x02 +#define FAILURE_OVERTEMP 0x04 + +static unsigned int wf_smu_failure_state; +static int wf_smu_readjust, wf_smu_skipping; + +/* + * ****** CPU Fans Control Loop ****** + * + */ + + +#define WF_SMU_CPU_FANS_INTERVAL 1 +#define WF_SMU_CPU_FANS_MAX_HISTORY 16 + +/* State data used by the cpu fans control loop + */ +struct wf_smu_cpu_fans_state { + int ticks; + s32 cpu_setpoint; + struct wf_cpu_pid_state pid; +}; + +static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; + + + +/* + * ****** Drive Fan Control Loop ****** + * + */ + +struct wf_smu_drive_fans_state { + int ticks; + s32 setpoint; + struct wf_pid_state pid; +}; + +static struct wf_smu_drive_fans_state *wf_smu_drive_fans; + +/* + * ****** Slots Fan Control Loop ****** + * + */ + +struct wf_smu_slots_fans_state { + int ticks; + s32 setpoint; + struct wf_pid_state pid; +}; + +static struct wf_smu_slots_fans_state *wf_smu_slots_fans; + +/* + * ***** Implementation ***** + * + */ + + +static void wf_smu_create_cpu_fans(void) +{ + struct wf_cpu_pid_param pid_param; + struct smu_sdbp_header *hdr; + struct smu_sdbp_cpupiddata *piddata; + struct smu_sdbp_fvt *fvt; + s32 tmax, tdelta, maxpow, powadj; + + /* First, locate the PID params in SMU SBD */ + hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); + if (hdr == 0) { + printk(KERN_WARNING "windfarm: CPU PID fan config not found " + "max fan speed\n"); + goto fail; + } + piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; + + /* Get the FVT params for operating point 0 (the only supported one + * for now) in order to get tmax + */ + hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); + if (hdr) { + fvt = (struct smu_sdbp_fvt *)&hdr[1]; + tmax = ((s32)fvt->maxtemp) << 16; + } else + tmax = 0x5e0000; /* 94 degree default */ + + /* Alloc & initialize state */ + wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), + GFP_KERNEL); + if (wf_smu_cpu_fans == NULL) + goto fail; + wf_smu_cpu_fans->ticks = 1; + + /* Fill PID params */ + pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; + pid_param.history_len = piddata->history_len; + if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { + printk(KERN_WARNING "windfarm: History size overflow on " + "CPU control loop (%d)\n", piddata->history_len); + pid_param.history_len = WF_CPU_PID_MAX_HISTORY; + } + pid_param.gd = piddata->gd; + pid_param.gp = piddata->gp; + pid_param.gr = piddata->gr / pid_param.history_len; + + tdelta = ((s32)piddata->target_temp_delta) << 16; + maxpow = ((s32)piddata->max_power) << 16; + powadj = ((s32)piddata->power_adj) << 16; + + pid_param.tmax = tmax; + pid_param.ttarget = tmax - tdelta; + pid_param.pmaxadj = maxpow - powadj; + + pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main); + pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main); + + wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); + + DBG("wf: CPU Fan control initialized.\n"); + DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", + FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), + pid_param.min, pid_param.max); + + return; + + fail: + printk(KERN_WARNING "windfarm: CPU fan config not found\n" + "for this machine model, max fan speed\n"); + + if (cpufreq_clamp) + wf_control_set_max(cpufreq_clamp); + if (fan_cpu_main) + wf_control_set_max(fan_cpu_main); +} + +static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) +{ + s32 new_setpoint, temp, power; + int rc; + + if (--st->ticks != 0) { + if (wf_smu_readjust) + goto readjust; + return; + } + st->ticks = WF_SMU_CPU_FANS_INTERVAL; + + rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); + if (rc) { + printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); + if (rc) { + printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", + FIX32TOPRINT(temp), FIX32TOPRINT(power)); + +#ifdef HACKED_OVERTEMP + if (temp > 0x4a0000) + wf_smu_failure_state |= FAILURE_OVERTEMP; +#else + if (temp > st->pid.param.tmax) + wf_smu_failure_state |= FAILURE_OVERTEMP; +#endif + new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); + + DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); + + if (st->cpu_setpoint == new_setpoint) + return; + st->cpu_setpoint = new_setpoint; + readjust: + if (fan_cpu_main && wf_smu_failure_state == 0) { + rc = fan_cpu_main->ops->set_value(fan_cpu_main, + st->cpu_setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: CPU main fan" + " error %d\n", rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } + if (fan_cpu_second && wf_smu_failure_state == 0) { + rc = fan_cpu_second->ops->set_value(fan_cpu_second, + st->cpu_setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: CPU second fan" + " error %d\n", rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } + if (fan_cpu_third && wf_smu_failure_state == 0) { + rc = fan_cpu_main->ops->set_value(fan_cpu_third, + st->cpu_setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: CPU third fan" + " error %d\n", rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } +} + +static void wf_smu_create_drive_fans(void) +{ + struct wf_pid_param param = { + .interval = 5, + .history_len = 2, + .gd = 0x01e00000, + .gp = 0x00500000, + .gr = 0x00000000, + .itarget = 0x00200000, + }; + + /* Alloc & initialize state */ + wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state), + GFP_KERNEL); + if (wf_smu_drive_fans == NULL) { + printk(KERN_WARNING "windfarm: Memory allocation error" + " max fan speed\n"); + goto fail; + } + wf_smu_drive_fans->ticks = 1; + + /* Fill PID params */ + param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN); + param.min = fan_hd->ops->get_min(fan_hd); + param.max = fan_hd->ops->get_max(fan_hd); + wf_pid_init(&wf_smu_drive_fans->pid, ¶m); + + DBG("wf: Drive Fan control initialized.\n"); + DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", + FIX32TOPRINT(param.itarget), param.min, param.max); + return; + + fail: + if (fan_hd) + wf_control_set_max(fan_hd); +} + +static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st) +{ + s32 new_setpoint, temp; + int rc; + + if (--st->ticks != 0) { + if (wf_smu_readjust) + goto readjust; + return; + } + st->ticks = st->pid.param.interval; + + rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp); + if (rc) { + printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n", + FIX32TOPRINT(temp)); + + if (temp > (st->pid.param.itarget + 0x50000)) + wf_smu_failure_state |= FAILURE_OVERTEMP; + + new_setpoint = wf_pid_run(&st->pid, temp); + + DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); + + if (st->setpoint == new_setpoint) + return; + st->setpoint = new_setpoint; + readjust: + if (fan_hd && wf_smu_failure_state == 0) { + rc = fan_hd->ops->set_value(fan_hd, st->setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: HD fan error %d\n", + rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } +} + +static void wf_smu_create_slots_fans(void) +{ + struct wf_pid_param param = { + .interval = 1, + .history_len = 8, + .gd = 0x00000000, + .gp = 0x00000000, + .gr = 0x00020000, + .itarget = 0x00000000 + }; + + /* Alloc & initialize state */ + wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state), + GFP_KERNEL); + if (wf_smu_slots_fans == NULL) { + printk(KERN_WARNING "windfarm: Memory allocation error" + " max fan speed\n"); + goto fail; + } + wf_smu_slots_fans->ticks = 1; + + /* Fill PID params */ + param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN); + param.min = fan_slots->ops->get_min(fan_slots); + param.max = fan_slots->ops->get_max(fan_slots); + wf_pid_init(&wf_smu_slots_fans->pid, ¶m); + + DBG("wf: Slots Fan control initialized.\n"); + DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", + FIX32TOPRINT(param.itarget), param.min, param.max); + return; + + fail: + if (fan_slots) + wf_control_set_max(fan_slots); +} + +static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st) +{ + s32 new_setpoint, power; + int rc; + + if (--st->ticks != 0) { + if (wf_smu_readjust) + goto readjust; + return; + } + st->ticks = st->pid.param.interval; + + rc = sensor_slots_power->ops->get_value(sensor_slots_power, &power); + if (rc) { + printk(KERN_WARNING "windfarm: Slots power sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n", + FIX32TOPRINT(power)); + +#if 0 /* Check what makes a good overtemp condition */ + if (power > (st->pid.param.itarget + 0x50000)) + wf_smu_failure_state |= FAILURE_OVERTEMP; +#endif + + new_setpoint = wf_pid_run(&st->pid, power); + + DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); + + if (st->setpoint == new_setpoint) + return; + st->setpoint = new_setpoint; + readjust: + if (fan_slots && wf_smu_failure_state == 0) { + rc = fan_slots->ops->set_value(fan_slots, st->setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: Slots fan error %d\n", + rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } +} + + +/* + * ****** Attributes ****** + * + */ + +#define BUILD_SHOW_FUNC_FIX(name, data) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + ssize_t r; \ + s32 val = 0; \ + data->ops->get_value(data, &val); \ + r = sprintf(buf, "%d.%03d", FIX32TOPRINT(val)); \ + return r; \ +} \ +static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL); + + +#define BUILD_SHOW_FUNC_INT(name, data) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + s32 val = 0; \ + data->ops->get_value(data, &val); \ + return sprintf(buf, "%d", val); \ +} \ +static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL); + +BUILD_SHOW_FUNC_INT(cpu_fan, fan_cpu_main); +BUILD_SHOW_FUNC_INT(hd_fan, fan_hd); +BUILD_SHOW_FUNC_INT(slots_fan, fan_slots); + +BUILD_SHOW_FUNC_FIX(cpu_temp, sensor_cpu_temp); +BUILD_SHOW_FUNC_FIX(cpu_power, sensor_cpu_power); +BUILD_SHOW_FUNC_FIX(hd_temp, sensor_hd_temp); +BUILD_SHOW_FUNC_FIX(slots_power, sensor_slots_power); + +/* + * ****** Setup / Init / Misc ... ****** + * + */ + +static void wf_smu_tick(void) +{ + unsigned int last_failure = wf_smu_failure_state; + unsigned int new_failure; + + if (!wf_smu_started) { + DBG("wf: creating control loops !\n"); + wf_smu_create_drive_fans(); + wf_smu_create_slots_fans(); + wf_smu_create_cpu_fans(); + wf_smu_started = 1; + } + + /* Skipping ticks */ + if (wf_smu_skipping && --wf_smu_skipping) + return; + + wf_smu_failure_state = 0; + if (wf_smu_drive_fans) + wf_smu_drive_fans_tick(wf_smu_drive_fans); + if (wf_smu_slots_fans) + wf_smu_slots_fans_tick(wf_smu_slots_fans); + if (wf_smu_cpu_fans) + wf_smu_cpu_fans_tick(wf_smu_cpu_fans); + + wf_smu_readjust = 0; + new_failure = wf_smu_failure_state & ~last_failure; + + /* If entering failure mode, clamp cpufreq and ramp all + * fans to full speed. + */ + if (wf_smu_failure_state && !last_failure) { + if (cpufreq_clamp) + wf_control_set_max(cpufreq_clamp); + if (fan_cpu_main) + wf_control_set_max(fan_cpu_main); + if (fan_cpu_second) + wf_control_set_max(fan_cpu_second); + if (fan_cpu_third) + wf_control_set_max(fan_cpu_third); + if (fan_hd) + wf_control_set_max(fan_hd); + if (fan_slots) + wf_control_set_max(fan_slots); + } + + /* If leaving failure mode, unclamp cpufreq and readjust + * all fans on next iteration + */ + if (!wf_smu_failure_state && last_failure) { + if (cpufreq_clamp) + wf_control_set_min(cpufreq_clamp); + wf_smu_readjust = 1; + } + + /* Overtemp condition detected, notify and start skipping a couple + * ticks to let the temperature go down + */ + if (new_failure & FAILURE_OVERTEMP) { + wf_set_overtemp(); + wf_smu_skipping = 2; + } + + /* We only clear the overtemp condition if overtemp is cleared + * _and_ no other failure is present. Since a sensor error will + * clear the overtemp condition (can't measure temperature) at + * the control loop levels, but we don't want to keep it clear + * here in this case + */ + if (new_failure == 0 && last_failure & FAILURE_OVERTEMP) + wf_clear_overtemp(); +} + + +static void wf_smu_new_control(struct wf_control *ct) +{ + if (wf_smu_all_controls_ok) + return; + + if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) { + if (wf_get_control(ct) == 0) { + fan_cpu_main = ct; + device_create_file(wf_smu_dev, &dev_attr_cpu_fan); + } + } + + if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) { + if (wf_get_control(ct) == 0) + fan_cpu_second = ct; + } + + if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) { + if (wf_get_control(ct) == 0) + fan_cpu_third = ct; + } + + if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { + if (wf_get_control(ct) == 0) + cpufreq_clamp = ct; + } + + if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { + if (wf_get_control(ct) == 0) { + fan_hd = ct; + device_create_file(wf_smu_dev, &dev_attr_hd_fan); + } + } + + if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) { + if (wf_get_control(ct) == 0) { + fan_slots = ct; + device_create_file(wf_smu_dev, &dev_attr_slots_fan); + } + } + + if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd && + fan_slots && cpufreq_clamp) + wf_smu_all_controls_ok = 1; +} + +static void wf_smu_new_sensor(struct wf_sensor *sr) +{ + if (wf_smu_all_sensors_ok) + return; + + if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { + if (wf_get_sensor(sr) == 0) { + sensor_cpu_power = sr; + device_create_file(wf_smu_dev, &dev_attr_cpu_power); + } + } + + if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { + if (wf_get_sensor(sr) == 0) { + sensor_cpu_temp = sr; + device_create_file(wf_smu_dev, &dev_attr_cpu_temp); + } + } + + if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { + if (wf_get_sensor(sr) == 0) { + sensor_hd_temp = sr; + device_create_file(wf_smu_dev, &dev_attr_hd_temp); + } + } + + if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) { + if (wf_get_sensor(sr) == 0) { + sensor_slots_power = sr; + device_create_file(wf_smu_dev, &dev_attr_slots_power); + } + } + + if (sensor_cpu_power && sensor_cpu_temp && + sensor_hd_temp && sensor_slots_power) + wf_smu_all_sensors_ok = 1; +} + + +static int wf_smu_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + switch(event) { + case WF_EVENT_NEW_CONTROL: + DBG("wf: new control %s detected\n", + ((struct wf_control *)data)->name); + wf_smu_new_control(data); + wf_smu_readjust = 1; + break; + case WF_EVENT_NEW_SENSOR: + DBG("wf: new sensor %s detected\n", + ((struct wf_sensor *)data)->name); + wf_smu_new_sensor(data); + break; + case WF_EVENT_TICK: + if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) + wf_smu_tick(); + } + + return 0; +} + +static struct notifier_block wf_smu_events = { + .notifier_call = wf_smu_notify, +}; + +static int wf_init_pm(void) +{ + printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); + + return 0; +} + +static int wf_smu_probe(struct device *ddev) +{ + wf_smu_dev = ddev; + + wf_register_client(&wf_smu_events); + + return 0; +} + +static int wf_smu_remove(struct device *ddev) +{ + wf_unregister_client(&wf_smu_events); + + /* XXX We don't have yet a guarantee that our callback isn't + * in progress when returning from wf_unregister_client, so + * we add an arbitrary delay. I'll have to fix that in the core + */ + msleep(1000); + + /* Release all sensors */ + /* One more crappy race: I don't think we have any guarantee here + * that the attribute callback won't race with the sensor beeing + * disposed of, and I'm not 100% certain what best way to deal + * with that except by adding locks all over... I'll do that + * eventually but heh, who ever rmmod this module anyway ? + */ + if (sensor_cpu_power) { + device_remove_file(wf_smu_dev, &dev_attr_cpu_power); + wf_put_sensor(sensor_cpu_power); + } + if (sensor_cpu_temp) { + device_remove_file(wf_smu_dev, &dev_attr_cpu_temp); + wf_put_sensor(sensor_cpu_temp); + } + if (sensor_hd_temp) { + device_remove_file(wf_smu_dev, &dev_attr_hd_temp); + wf_put_sensor(sensor_hd_temp); + } + if (sensor_slots_power) { + device_remove_file(wf_smu_dev, &dev_attr_slots_power); + wf_put_sensor(sensor_slots_power); + } + + /* Release all controls */ + if (fan_cpu_main) { + device_remove_file(wf_smu_dev, &dev_attr_cpu_fan); + wf_put_control(fan_cpu_main); + } + if (fan_cpu_second) + wf_put_control(fan_cpu_second); + if (fan_cpu_third) + wf_put_control(fan_cpu_third); + if (fan_hd) { + device_remove_file(wf_smu_dev, &dev_attr_hd_fan); + wf_put_control(fan_hd); + } + if (fan_slots) { + device_remove_file(wf_smu_dev, &dev_attr_slots_fan); + wf_put_control(fan_slots); + } + if (cpufreq_clamp) + wf_put_control(cpufreq_clamp); + + /* Destroy control loops state structures */ + if (wf_smu_slots_fans) + kfree(wf_smu_cpu_fans); + if (wf_smu_drive_fans) + kfree(wf_smu_cpu_fans); + if (wf_smu_cpu_fans) + kfree(wf_smu_cpu_fans); + + wf_smu_dev = NULL; + + return 0; +} + +static struct device_driver wf_smu_driver = { + .name = "windfarm", + .bus = &platform_bus_type, + .probe = wf_smu_probe, + .remove = wf_smu_remove, +}; + + +static int __init wf_smu_init(void) +{ + int rc = -ENODEV; + + if (machine_is_compatible("PowerMac9,1")) + rc = wf_init_pm(); + + if (rc == 0) { +#ifdef MODULE + request_module("windfarm_smu_controls"); + request_module("windfarm_smu_sensors"); + request_module("windfarm_lm75_sensor"); + +#endif /* MODULE */ + driver_register(&wf_smu_driver); + } + + return rc; +} + +static void __exit wf_smu_exit(void) +{ + + driver_unregister(&wf_smu_driver); +} + + +module_init(wf_smu_init); +module_exit(wf_smu_exit); + +MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); +MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); +MODULE_LICENSE("GPL"); + diff --git a/drivers/macintosh/windfarm_smu_controls.c b/drivers/macintosh/windfarm_smu_controls.c new file mode 100644 index 000000000000..2c3158c81ff2 --- /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"); + diff --git a/drivers/macintosh/windfarm_smu_sensors.c b/drivers/macintosh/windfarm_smu_sensors.c new file mode 100644 index 000000000000..b558cc209d49 --- /dev/null +++ b/drivers/macintosh/windfarm_smu_sensors.c @@ -0,0 +1,479 @@ +/* + * Windfarm PowerMac thermal control. SMU based sensors + * + * (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 "0.2" + +#undef DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +/* + * Various SMU "partitions" calibration objects for which we + * keep pointers here for use by bits & pieces of the driver + */ +static struct smu_sdbp_cpuvcp *cpuvcp; +static int cpuvcp_version; +static struct smu_sdbp_cpudiode *cpudiode; +static struct smu_sdbp_slotspow *slotspow; +static u8 *debugswitches; + +/* + * SMU basic sensors objects + */ + +static LIST_HEAD(smu_ads); + +struct smu_ad_sensor { + struct list_head link; + u32 reg; /* index in SMU */ + struct wf_sensor sens; +}; +#define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens) + +static void smu_ads_release(struct wf_sensor *sr) +{ + struct smu_ad_sensor *ads = to_smu_ads(sr); + + kfree(ads); +} + +static int smu_read_adc(u8 id, s32 *value) +{ + struct smu_simple_cmd cmd; + DECLARE_COMPLETION(comp); + int rc; + + rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1, + smu_done_complete, &comp, id); + if (rc) + return rc; + wait_for_completion(&comp); + if (cmd.cmd.status != 0) + return cmd.cmd.status; + if (cmd.cmd.reply_len != 2) { + printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n", + id, cmd.cmd.reply_len); + return -EIO; + } + *value = *((u16 *)cmd.buffer); + return 0; +} + +static int smu_cputemp_get(struct wf_sensor *sr, s32 *value) +{ + struct smu_ad_sensor *ads = to_smu_ads(sr); + int rc; + s32 val; + s64 scaled; + + rc = smu_read_adc(ads->reg, &val); + if (rc) { + printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n", + rc); + return rc; + } + + /* Ok, we have to scale & adjust, taking units into account */ + scaled = (s64)(((u64)val) * (u64)cpudiode->m_value); + scaled >>= 3; + scaled += ((s64)cpudiode->b_value) << 9; + *value = (s32)(scaled << 1); + + return 0; +} + +static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value) +{ + struct smu_ad_sensor *ads = to_smu_ads(sr); + s32 val, scaled; + int rc; + + rc = smu_read_adc(ads->reg, &val); + if (rc) { + printk(KERN_ERR "windfarm: read CPU current failed, err %d\n", + rc); + return rc; + } + + /* Ok, we have to scale & adjust, taking units into account */ + scaled = (s32)(val * (u32)cpuvcp->curr_scale); + scaled += (s32)cpuvcp->curr_offset; + *value = scaled << 4; + + return 0; +} + +static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value) +{ + struct smu_ad_sensor *ads = to_smu_ads(sr); + s32 val, scaled; + int rc; + + rc = smu_read_adc(ads->reg, &val); + if (rc) { + printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n", + rc); + return rc; + } + + /* Ok, we have to scale & adjust, taking units into account */ + scaled = (s32)(val * (u32)cpuvcp->volt_scale); + scaled += (s32)cpuvcp->volt_offset; + *value = scaled << 4; + + return 0; +} + +static int smu_slotspow_get(struct wf_sensor *sr, s32 *value) +{ + struct smu_ad_sensor *ads = to_smu_ads(sr); + s32 val, scaled; + int rc; + + rc = smu_read_adc(ads->reg, &val); + if (rc) { + printk(KERN_ERR "windfarm: read slots power failed, err %d\n", + rc); + return rc; + } + + /* Ok, we have to scale & adjust, taking units into account */ + scaled = (s32)(val * (u32)slotspow->pow_scale); + scaled += (s32)slotspow->pow_offset; + *value = scaled << 4; + + return 0; +} + + +static struct wf_sensor_ops smu_cputemp_ops = { + .get_value = smu_cputemp_get, + .release = smu_ads_release, + .owner = THIS_MODULE, +}; +static struct wf_sensor_ops smu_cpuamp_ops = { + .get_value = smu_cpuamp_get, + .release = smu_ads_release, + .owner = THIS_MODULE, +}; +static struct wf_sensor_ops smu_cpuvolt_ops = { + .get_value = smu_cpuvolt_get, + .release = smu_ads_release, + .owner = THIS_MODULE, +}; +static struct wf_sensor_ops smu_slotspow_ops = { + .get_value = smu_slotspow_get, + .release = smu_ads_release, + .owner = THIS_MODULE, +}; + + +static struct smu_ad_sensor *smu_ads_create(struct device_node *node) +{ + struct smu_ad_sensor *ads; + char *c, *l; + u32 *v; + + ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL); + if (ads == NULL) + return NULL; + c = (char *)get_property(node, "device_type", NULL); + l = (char *)get_property(node, "location", NULL); + if (c == NULL || l == NULL) + goto fail; + + /* We currently pick the sensors based on the OF name and location + * properties, while Darwin uses the sensor-id's. + * The problem with the IDs is that they are model specific while it + * looks like apple has been doing a reasonably good job at keeping + * the names and locations consistents so I'll stick with the names + * and locations for now. + */ + if (!strcmp(c, "temp-sensor") && + !strcmp(l, "CPU T-Diode")) { + ads->sens.ops = &smu_cputemp_ops; + ads->sens.name = "cpu-temp"; + } else if (!strcmp(c, "current-sensor") && + !strcmp(l, "CPU Current")) { + ads->sens.ops = &smu_cpuamp_ops; + ads->sens.name = "cpu-current"; + } else if (!strcmp(c, "voltage-sensor") && + !strcmp(l, "CPU Voltage")) { + ads->sens.ops = &smu_cpuvolt_ops; + ads->sens.name = "cpu-voltage"; + } else if (!strcmp(c, "power-sensor") && + !strcmp(l, "Slots Power")) { + ads->sens.ops = &smu_slotspow_ops; + ads->sens.name = "slots-power"; + if (slotspow == NULL) { + DBG("wf: slotspow partition (%02x) not found\n", + SMU_SDB_SLOTSPOW_ID); + goto fail; + } + } else + goto fail; + + v = (u32 *)get_property(node, "reg", NULL); + if (v == NULL) + goto fail; + ads->reg = *v; + + if (wf_register_sensor(&ads->sens)) + goto fail; + return ads; + fail: + kfree(ads); + return NULL; +} + +/* + * SMU Power combo sensor object + */ + +struct smu_cpu_power_sensor { + struct list_head link; + struct wf_sensor *volts; + struct wf_sensor *amps; + int fake_volts : 1; + int quadratic : 1; + struct wf_sensor sens; +}; +#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens) + +static struct smu_cpu_power_sensor *smu_cpu_power; + +static void smu_cpu_power_release(struct wf_sensor *sr) +{ + struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr); + + if (pow->volts) + wf_put_sensor(pow->volts); + if (pow->amps) + wf_put_sensor(pow->amps); + kfree(pow); +} + +static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value) +{ + struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr); + s32 volts, amps, power; + u64 tmps, tmpa, tmpb; + int rc; + + rc = pow->amps->ops->get_value(pow->amps, &s); + if (rc) + return rc; + + if (pow->fake_volts) { + *value = amps * 12 - 0x30000; + return 0; + } + + rc = pow->volts->ops->get_value(pow->volts, &volts); + if (rc) + return rc; + + power = (s32)((((u64)volts) * ((u64)amps)) >> 16); + if (!pow->quadratic) { + *value = power; + return 0; + } + tmps = (((u64)power) * ((u64)power)) >> 16; + tmpa = ((u64)cpuvcp->power_quads[0]) * tmps; + tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power); + *value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12); + + return 0; +} + +static struct wf_sensor_ops smu_cpu_power_ops = { + .get_value = smu_cpu_power_get, + .release = smu_cpu_power_release, + .owner = THIS_MODULE, +}; + + +static struct smu_cpu_power_sensor * +smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps) +{ + struct smu_cpu_power_sensor *pow; + + pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL); + if (pow == NULL) + return NULL; + pow->sens.ops = &smu_cpu_power_ops; + pow->sens.name = "cpu-power"; + + wf_get_sensor(volts); + pow->volts = volts; + wf_get_sensor(amps); + pow->amps = amps; + + /* Some early machines need a faked voltage */ + if (debugswitches && ((*debugswitches) & 0x80)) { + printk(KERN_INFO "windfarm: CPU Power sensor using faked" + " voltage !\n"); + pow->fake_volts = 1; + } else + pow->fake_volts = 0; + + /* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now, + * I yet have to figure out what's up with 8,2 and will have to + * adjust for later, unless we can 100% trust the SDB partition... + */ + if ((machine_is_compatible("PowerMac8,1") || + machine_is_compatible("PowerMac8,2") || + machine_is_compatible("PowerMac9,1")) && + cpuvcp_version >= 2) { + pow->quadratic = 1; + DBG("windfarm: CPU Power using quadratic transform\n"); + } else + pow->quadratic = 0; + + if (wf_register_sensor(&pow->sens)) + goto fail; + return pow; + fail: + kfree(pow); + return NULL; +} + +static int smu_fetch_param_partitions(void) +{ + struct smu_sdbp_header *hdr; + + /* Get CPU voltage/current/power calibration data */ + hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL); + if (hdr == NULL) { + DBG("wf: cpuvcp partition (%02x) not found\n", + SMU_SDB_CPUVCP_ID); + return -ENODEV; + } + cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1]; + /* Keep version around */ + cpuvcp_version = hdr->version; + + /* Get CPU diode calibration data */ + hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL); + if (hdr == NULL) { + DBG("wf: cpudiode partition (%02x) not found\n", + SMU_SDB_CPUDIODE_ID); + return -ENODEV; + } + cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1]; + + /* Get slots power calibration data if any */ + hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL); + if (hdr != NULL) + slotspow = (struct smu_sdbp_slotspow *)&hdr[1]; + + /* Get debug switches if any */ + hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL); + if (hdr != NULL) + debugswitches = (u8 *)&hdr[1]; + + return 0; +} + +static int __init smu_sensors_init(void) +{ + struct device_node *smu, *sensors, *s; + struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL; + int rc; + + if (!smu_present()) + return -ENODEV; + + /* Get parameters partitions */ + rc = smu_fetch_param_partitions(); + if (rc) + return rc; + + smu = of_find_node_by_type(NULL, "smu"); + if (smu == NULL) + return -ENODEV; + + /* Look for sensors subdir */ + for (sensors = NULL; + (sensors = of_get_next_child(smu, sensors)) != NULL;) + if (!strcmp(sensors->name, "sensors")) + break; + + of_node_put(smu); + + /* Create basic sensors */ + for (s = NULL; + sensors && (s = of_get_next_child(sensors, s)) != NULL;) { + struct smu_ad_sensor *ads; + + ads = smu_ads_create(s); + if (ads == NULL) + continue; + list_add(&ads->link, &smu_ads); + /* keep track of cpu voltage & current */ + if (!strcmp(ads->sens.name, "cpu-voltage")) + volt_sensor = ads; + else if (!strcmp(ads->sens.name, "cpu-current")) + curr_sensor = ads; + } + + of_node_put(sensors); + + /* Create CPU power sensor if possible */ + if (volt_sensor && curr_sensor) + smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens, + &curr_sensor->sens); + + return 0; +} + +static void __exit smu_sensors_exit(void) +{ + struct smu_ad_sensor *ads; + + /* dispose of power sensor */ + if (smu_cpu_power) + wf_unregister_sensor(&smu_cpu_power->sens); + + /* dispose of basic sensors */ + while (!list_empty(&smu_ads)) { + ads = list_entry(smu_ads.next, struct smu_ad_sensor, link); + list_del(&ads->link); + wf_unregister_sensor(&ads->sens); + } +} + + +module_init(smu_sensors_init); +module_exit(smu_sensors_exit); + +MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); +MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control"); +MODULE_LICENSE("GPL"); + |
