// SPDX-License-Identifier: GPL-2.0-only /* * Windfarm PowerMac thermal control. SMU based controls * * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. * <benh@kernel.crashing.org> */ #include <linux/types.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/wait.h> #include <linux/completion.h> #include <asm/prom.h> #include <asm/machdep.h> #include <asm/io.h> #include <asm/sections.h> #include <asm/smu.h> #include "windfarm.h" #define VERSION "0.4" #undef DEBUG #ifdef DEBUG #define DBG(args...) printk(args) #else #define DBG(args...) do { } while(0) #endif static int smu_supports_new_fans_ops = 1; /* * SMU fans control object */ static LIST_HEAD(smu_fans); struct smu_fan_control { struct list_head link; int fan_type; /* 0 = rpm, 1 = pwm */ u32 reg; /* index in SMU */ s32 value; /* current value */ s32 min, max; /* min/max values */ struct wf_control ctrl; }; #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl) static int smu_set_fan(int pwm, u8 id, u16 value) { struct smu_cmd cmd; u8 buffer[16]; DECLARE_COMPLETION_ONSTACK(comp); int rc; /* Fill SMU command structure */ cmd.cmd = SMU_CMD_FAN_COMMAND; /* The SMU has an "old" and a "new" way of setting the fan speed * Unfortunately, I found no reliable way to know which one works * on a given machine model. After some investigations it appears * that MacOS X just tries the new one, and if it fails fallbacks * to the old ones ... Ugh. */ retry: if (smu_supports_new_fans_ops) { buffer[0] = 0x30; buffer[1] = id; *((u16 *)(&buffer[2])) = value; cmd.data_len = 4; } else { if (id > 7) return -EINVAL; /* Fill argument buffer */ memset(buffer, 0, 16); buffer[0] = pwm ? 0x10 : 0x00; buffer[1] = 0x01 << id; *((u16 *)&buffer[2 + id * 2]) = value; cmd.data_len = 14; } cmd.reply_len = 16; cmd.data_buf = cmd.reply_buf = buffer; cmd.status = 0; cmd.done = smu_done_complete; cmd.misc = ∁ rc = smu_queue_cmd(&cmd); if (rc) return rc; wait_for_completion(&comp); /* Handle fallback (see comment above) */ if (cmd.status != 0 && smu_supports_new_fans_ops) { printk(KERN_WARNING "windfarm: SMU failed new fan command " "falling back to old method\n"); smu_supports_new_fans_ops = 0; goto retry; } return cmd.status; } static void smu_fan_release(struct wf_control *ct) { struct smu_fan_control *fct = to_smu_fan(ct); kfree(fct); } static int smu_fan_set(struct wf_control *ct, s32 value) { struct smu_fan_control *fct = to_smu_fan(ct); if (value < fct->min) value = fct->min; if (value > fct->max) value = fct->max; fct->value = value; return smu_set_fan(fct->fan_type, fct->reg, value); } static int smu_fan_get(struct wf_control *ct, s32 *value) { struct smu_fan_control *fct = to_smu_fan(ct); *value = fct->value; /* todo: read from SMU */ return 0; } static s32 smu_fan_min(struct wf_control *ct) { struct smu_fan_control *fct = to_smu_fan(ct); return fct->min; } static s32 smu_fan_max(struct wf_control *ct) { struct smu_fan_control *fct = to_smu_fan(ct); return fct->max; } static const struct wf_control_ops smu_fan_ops = { .set_value = smu_fan_set, .get_value = smu_fan_get, .get_min = smu_fan_min, .get_max = smu_fan_max, .release = smu_fan_release, .owner = THIS_MODULE, }; static struct smu_fan_control *smu_fan_create(struct device_node *node, int pwm_fan) { struct smu_fan_control *fct; const s32 *v; const u32 *reg; const char *l; fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL); if (fct == NULL) return NULL; fct->ctrl.ops = &smu_fan_ops; l = of_get_property(node, "location", NULL); if (l == NULL) goto fail; fct->fan_type = pwm_fan; fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN; /* We use the name & location here the same way we do for SMU sensors, * see the comment in windfarm_smu_sensors.c. The locations are a bit * less consistent here between the iMac and the desktop models, but * that is good enough for our needs for now at least. * * One problem though is that Apple seem to be inconsistent with case * and the kernel doesn't have strcasecmp =P */ fct->ctrl.name = NULL; /* Names used on desktop models */ if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") || !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") || !strcmp(l, "CPU A EXHAUST")) fct->ctrl.name = "cpu-rear-fan-0"; else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") || !strcmp(l, "CPU B EXHAUST")) fct->ctrl.name = "cpu-rear-fan-1"; else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") || !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") || !strcmp(l, "CPU A INTAKE")) fct->ctrl.name = "cpu-front-fan-0"; else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") || !strcmp(l, "CPU B INTAKE")) fct->ctrl.name = "cpu-front-fan-1"; else if (!strcmp(l, "CPU A PUMP")) fct->ctrl.name = "cpu-pump-0"; else if (!strcmp(l, "CPU B PUMP")) fct->ctrl.name = "cpu-pump-1"; else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") || !strcmp(l, "EXPANSION SLOTS INTAKE")) fct->ctrl.name = "slots-fan"; else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") || !strcmp(l, "DRIVE BAY A INTAKE")) fct->ctrl.name = "drive-bay-fan"; else if (!strcmp(l, "BACKSIDE")) fct->ctrl.name = "backside-fan"; /* Names used on iMac models */ if (!strcmp(l, "System Fan") || !strcmp(l, "System fan")) fct->ctrl.name = "system-fan"; else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan")) fct->ctrl.name = "cpu-fan"; else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive")) fct->ctrl.name = "drive-bay-fan"; else if (!strcmp(l, "HDD Fan")) /* seen on iMac G5 iSight */ fct->ctrl.name = "hard-drive-fan"; else if (!strcmp(l, "ODD Fan")) /* same */ fct->ctrl.name = "optical-drive-fan"; /* Unrecognized fan, bail out */ if (fct->ctrl.name == NULL) goto fail; /* Get min & max values*/ v = of_get_property(node, "min-value", NULL); if (v == NULL) goto fail; fct->min = *v; v = of_get_property(node, "max-value", NULL); if (v == NULL) goto fail; fct->max = *v; /* Get "reg" value */ reg = of_get_property(node, "reg", NULL); if (reg == NULL) goto fail; fct->reg = *reg; if (wf_register_control(&fct->ctrl)) goto fail; return fct; fail: kfree(fct); return NULL; } static int __init smu_controls_init(void) { struct device_node *smu, *fans, *fan; if (!smu_present()) return -ENODEV; smu = of_find_node_by_type(NULL, "smu"); if (smu == NULL) return -ENODEV; /* Look for RPM fans */ for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) if (of_node_name_eq(fans, "rpm-fans") || of_device_is_compatible(fans, "smu-rpm-fans")) break; for (fan = NULL; fans && (fan = of_get_next_child(fans, fan)) != NULL;) { struct smu_fan_control *fct; fct = smu_fan_create(fan, 0); if (fct == NULL) { printk(KERN_WARNING "windfarm: Failed to create SMU " "RPM fan %pOFn\n", fan); 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 (of_node_name_eq(fans, "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 %pOFn\n", fan); 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");