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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Windfarm PowerMac thermal control. SMU based controls4 *5 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.6 * <benh@kernel.crashing.org>7 */8 9#include <linux/types.h>10#include <linux/errno.h>11#include <linux/kernel.h>12#include <linux/delay.h>13#include <linux/slab.h>14#include <linux/init.h>15#include <linux/wait.h>16#include <linux/completion.h>17#include <linux/of.h>18 19#include <asm/machdep.h>20#include <asm/io.h>21#include <asm/sections.h>22#include <asm/smu.h>23 24#include "windfarm.h"25 26#define VERSION "0.4"27 28#undef DEBUG29 30#ifdef DEBUG31#define DBG(args...) printk(args)32#else33#define DBG(args...) do { } while(0)34#endif35 36static int smu_supports_new_fans_ops = 1;37 38/*39 * SMU fans control object40 */41 42static LIST_HEAD(smu_fans);43 44struct smu_fan_control {45 struct list_head link;46 int fan_type; /* 0 = rpm, 1 = pwm */47 u32 reg; /* index in SMU */48 s32 value; /* current value */49 s32 min, max; /* min/max values */50 struct wf_control ctrl;51};52#define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)53 54static int smu_set_fan(int pwm, u8 id, u16 value)55{56 struct smu_cmd cmd;57 u8 buffer[16];58 DECLARE_COMPLETION_ONSTACK(comp);59 int rc;60 61 /* Fill SMU command structure */62 cmd.cmd = SMU_CMD_FAN_COMMAND;63 64 /* The SMU has an "old" and a "new" way of setting the fan speed65 * Unfortunately, I found no reliable way to know which one works66 * on a given machine model. After some investigations it appears67 * that MacOS X just tries the new one, and if it fails fallbacks68 * to the old ones ... Ugh.69 */70 retry:71 if (smu_supports_new_fans_ops) {72 buffer[0] = 0x30;73 buffer[1] = id;74 *((u16 *)(&buffer[2])) = value;75 cmd.data_len = 4;76 } else {77 if (id > 7)78 return -EINVAL;79 /* Fill argument buffer */80 memset(buffer, 0, 16);81 buffer[0] = pwm ? 0x10 : 0x00;82 buffer[1] = 0x01 << id;83 *((u16 *)&buffer[2 + id * 2]) = value;84 cmd.data_len = 14;85 }86 87 cmd.reply_len = 16;88 cmd.data_buf = cmd.reply_buf = buffer;89 cmd.status = 0;90 cmd.done = smu_done_complete;91 cmd.misc = ∁92 93 rc = smu_queue_cmd(&cmd);94 if (rc)95 return rc;96 wait_for_completion(&comp);97 98 /* Handle fallback (see comment above) */99 if (cmd.status != 0 && smu_supports_new_fans_ops) {100 printk(KERN_WARNING "windfarm: SMU failed new fan command "101 "falling back to old method\n");102 smu_supports_new_fans_ops = 0;103 goto retry;104 }105 106 return cmd.status;107}108 109static void smu_fan_release(struct wf_control *ct)110{111 struct smu_fan_control *fct = to_smu_fan(ct);112 113 kfree(fct);114}115 116static int smu_fan_set(struct wf_control *ct, s32 value)117{118 struct smu_fan_control *fct = to_smu_fan(ct);119 120 if (value < fct->min)121 value = fct->min;122 if (value > fct->max)123 value = fct->max;124 fct->value = value;125 126 return smu_set_fan(fct->fan_type, fct->reg, value);127}128 129static int smu_fan_get(struct wf_control *ct, s32 *value)130{131 struct smu_fan_control *fct = to_smu_fan(ct);132 *value = fct->value; /* todo: read from SMU */133 return 0;134}135 136static s32 smu_fan_min(struct wf_control *ct)137{138 struct smu_fan_control *fct = to_smu_fan(ct);139 return fct->min;140}141 142static s32 smu_fan_max(struct wf_control *ct)143{144 struct smu_fan_control *fct = to_smu_fan(ct);145 return fct->max;146}147 148static const struct wf_control_ops smu_fan_ops = {149 .set_value = smu_fan_set,150 .get_value = smu_fan_get,151 .get_min = smu_fan_min,152 .get_max = smu_fan_max,153 .release = smu_fan_release,154 .owner = THIS_MODULE,155};156 157static struct smu_fan_control *smu_fan_create(struct device_node *node,158 int pwm_fan)159{160 struct smu_fan_control *fct;161 const s32 *v;162 const u32 *reg;163 const char *l;164 165 fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);166 if (fct == NULL)167 return NULL;168 fct->ctrl.ops = &smu_fan_ops;169 l = of_get_property(node, "location", NULL);170 if (l == NULL)171 goto fail;172 173 fct->fan_type = pwm_fan;174 fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;175 176 /* We use the name & location here the same way we do for SMU sensors,177 * see the comment in windfarm_smu_sensors.c. The locations are a bit178 * less consistent here between the iMac and the desktop models, but179 * that is good enough for our needs for now at least.180 *181 * One problem though is that Apple seem to be inconsistent with case182 * and the kernel doesn't have strcasecmp =P183 */184 185 fct->ctrl.name = NULL;186 187 /* Names used on desktop models */188 if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||189 !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") ||190 !strcmp(l, "CPU A EXHAUST"))191 fct->ctrl.name = "cpu-rear-fan-0";192 else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") ||193 !strcmp(l, "CPU B EXHAUST"))194 fct->ctrl.name = "cpu-rear-fan-1";195 else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||196 !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") ||197 !strcmp(l, "CPU A INTAKE"))198 fct->ctrl.name = "cpu-front-fan-0";199 else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") ||200 !strcmp(l, "CPU B INTAKE"))201 fct->ctrl.name = "cpu-front-fan-1";202 else if (!strcmp(l, "CPU A PUMP"))203 fct->ctrl.name = "cpu-pump-0";204 else if (!strcmp(l, "CPU B PUMP"))205 fct->ctrl.name = "cpu-pump-1";206 else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") ||207 !strcmp(l, "EXPANSION SLOTS INTAKE"))208 fct->ctrl.name = "slots-fan";209 else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") ||210 !strcmp(l, "DRIVE BAY A INTAKE"))211 fct->ctrl.name = "drive-bay-fan";212 else if (!strcmp(l, "BACKSIDE"))213 fct->ctrl.name = "backside-fan";214 215 /* Names used on iMac models */216 if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))217 fct->ctrl.name = "system-fan";218 else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))219 fct->ctrl.name = "cpu-fan";220 else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))221 fct->ctrl.name = "drive-bay-fan";222 else if (!strcmp(l, "HDD Fan")) /* seen on iMac G5 iSight */223 fct->ctrl.name = "hard-drive-fan";224 else if (!strcmp(l, "ODD Fan")) /* same */225 fct->ctrl.name = "optical-drive-fan";226 227 /* Unrecognized fan, bail out */228 if (fct->ctrl.name == NULL)229 goto fail;230 231 /* Get min & max values*/232 v = of_get_property(node, "min-value", NULL);233 if (v == NULL)234 goto fail;235 fct->min = *v;236 v = of_get_property(node, "max-value", NULL);237 if (v == NULL)238 goto fail;239 fct->max = *v;240 241 /* Get "reg" value */242 reg = of_get_property(node, "reg", NULL);243 if (reg == NULL)244 goto fail;245 fct->reg = *reg;246 247 if (wf_register_control(&fct->ctrl))248 goto fail;249 250 return fct;251 fail:252 kfree(fct);253 return NULL;254}255 256 257static int __init smu_controls_init(void)258{259 struct device_node *smu, *fans, *fan;260 261 if (!smu_present())262 return -ENODEV;263 264 smu = of_find_node_by_type(NULL, "smu");265 if (smu == NULL)266 return -ENODEV;267 268 /* Look for RPM fans */269 for_each_child_of_node(smu, fans)270 if (of_node_name_eq(fans, "rpm-fans") ||271 of_device_is_compatible(fans, "smu-rpm-fans"))272 break;273 for_each_child_of_node(fans, fan) {274 struct smu_fan_control *fct;275 276 fct = smu_fan_create(fan, 0);277 if (fct == NULL) {278 printk(KERN_WARNING "windfarm: Failed to create SMU "279 "RPM fan %pOFn\n", fan);280 continue;281 }282 list_add(&fct->link, &smu_fans);283 }284 of_node_put(fans);285 286 287 /* Look for PWM fans */288 for_each_child_of_node(smu, fans)289 if (of_node_name_eq(fans, "pwm-fans"))290 break;291 for_each_child_of_node(fans, fan) {292 struct smu_fan_control *fct;293 294 fct = smu_fan_create(fan, 1);295 if (fct == NULL) {296 printk(KERN_WARNING "windfarm: Failed to create SMU "297 "PWM fan %pOFn\n", fan);298 continue;299 }300 list_add(&fct->link, &smu_fans);301 }302 of_node_put(fans);303 of_node_put(smu);304 305 return 0;306}307 308static void __exit smu_controls_exit(void)309{310 struct smu_fan_control *fct;311 312 while (!list_empty(&smu_fans)) {313 fct = list_entry(smu_fans.next, struct smu_fan_control, link);314 list_del(&fct->link);315 wf_unregister_control(&fct->ctrl);316 }317}318 319 320module_init(smu_controls_init);321module_exit(smu_controls_exit);322 323MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");324MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");325MODULE_LICENSE("GPL");326 327