/* * 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 <linux/completion.h> #include <asm/prom.h> #include <asm/machdep.h> #include <asm/io.h> #include <asm/sections.h> #include <asm/smu.h> #include "windfarm.h" #define VERSION "0.2" #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_ONSTACK(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 const struct wf_sensor_ops smu_cputemp_ops = { .get_value = smu_cputemp_get, .release = smu_ads_release, .owner = THIS_MODULE, }; static const struct wf_sensor_ops smu_cpuamp_ops = { .get_value = smu_cpuamp_get, .release = smu_ads_release, .owner = THIS_MODULE, }; static const struct wf_sensor_ops smu_cpuvolt_ops = { .get_value = smu_cpuvolt_get, .release = smu_ads_release, .owner = THIS_MODULE, }; static const 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; const char *c, *l; const u32 *v; ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL); if (ads == NULL) return NULL; c = of_get_property(node, "device_type", NULL); l = of_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"; if (cpudiode == NULL) { DBG("wf: cpudiode partition (%02x) not found\n", SMU_SDB_CPUDIODE_ID); goto fail; } } else if (!strcmp(c, "current-sensor") && !strcmp(l, "CPU Current")) { ads->sens.ops = &smu_cpuamp_ops; ads->sens.name = "cpu-current"; if (cpuvcp == NULL) { DBG("wf: cpuvcp partition (%02x) not found\n", SMU_SDB_CPUVCP_ID); goto fail; } } else if (!strcmp(c, "voltage-sensor") && !strcmp(l, "CPU Voltage")) { ads->sens.ops = &smu_cpuvolt_ops; ads->sens.name = "cpu-voltage"; if (cpuvcp == NULL) { DBG("wf: cpuvcp partition (%02x) not found\n", SMU_SDB_CPUVCP_ID); goto fail; } } 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 = of_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 const 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 ((of_machine_is_compatible("PowerMac8,1") || of_machine_is_compatible("PowerMac8,2") || of_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 void smu_fetch_param_partitions(void) { const 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) { 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) 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]; } static int __init smu_sensors_init(void) { struct device_node *smu, *sensors, *s; struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL; if (!smu_present()) return -ENODEV; /* Get parameters partitions */ smu_fetch_param_partitions(); 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");