Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Windfarm PowerMac thermal control. SMU based controls |
| 3 | * |
| 4 | * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. |
| 5 | * <benh@kernel.crashing.org> |
| 6 | * |
| 7 | * Released under the term of the GNU GPL v2. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/delay.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/wait.h> |
| 17 | #include <asm/prom.h> |
| 18 | #include <asm/machdep.h> |
| 19 | #include <asm/io.h> |
| 20 | #include <asm/system.h> |
| 21 | #include <asm/sections.h> |
| 22 | #include <asm/smu.h> |
| 23 | |
| 24 | #include "windfarm.h" |
| 25 | |
| 26 | #define VERSION "0.3" |
| 27 | |
| 28 | #undef DEBUG |
| 29 | |
| 30 | #ifdef DEBUG |
| 31 | #define DBG(args...) printk(args) |
| 32 | #else |
| 33 | #define DBG(args...) do { } while(0) |
| 34 | #endif |
| 35 | |
| 36 | /* |
| 37 | * SMU fans control object |
| 38 | */ |
| 39 | |
| 40 | static LIST_HEAD(smu_fans); |
| 41 | |
| 42 | struct smu_fan_control { |
| 43 | struct list_head link; |
| 44 | int fan_type; /* 0 = rpm, 1 = pwm */ |
| 45 | u32 reg; /* index in SMU */ |
| 46 | s32 value; /* current value */ |
| 47 | s32 min, max; /* min/max values */ |
| 48 | struct wf_control ctrl; |
| 49 | }; |
| 50 | #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl) |
| 51 | |
| 52 | static int smu_set_fan(int pwm, u8 id, u16 value) |
| 53 | { |
| 54 | struct smu_cmd cmd; |
| 55 | u8 buffer[16]; |
| 56 | DECLARE_COMPLETION(comp); |
| 57 | int rc; |
| 58 | |
| 59 | /* Fill SMU command structure */ |
| 60 | cmd.cmd = SMU_CMD_FAN_COMMAND; |
| 61 | cmd.data_len = 14; |
| 62 | cmd.reply_len = 16; |
| 63 | cmd.data_buf = cmd.reply_buf = buffer; |
| 64 | cmd.status = 0; |
| 65 | cmd.done = smu_done_complete; |
| 66 | cmd.misc = ∁ |
| 67 | |
| 68 | /* Fill argument buffer */ |
| 69 | memset(buffer, 0, 16); |
| 70 | buffer[0] = pwm ? 0x10 : 0x00; |
| 71 | buffer[1] = 0x01 << id; |
| 72 | *((u16 *)&buffer[2 + id * 2]) = value; |
| 73 | |
| 74 | rc = smu_queue_cmd(&cmd); |
| 75 | if (rc) |
| 76 | return rc; |
| 77 | wait_for_completion(&comp); |
| 78 | return cmd.status; |
| 79 | } |
| 80 | |
| 81 | static void smu_fan_release(struct wf_control *ct) |
| 82 | { |
| 83 | struct smu_fan_control *fct = to_smu_fan(ct); |
| 84 | |
| 85 | kfree(fct); |
| 86 | } |
| 87 | |
| 88 | static int smu_fan_set(struct wf_control *ct, s32 value) |
| 89 | { |
| 90 | struct smu_fan_control *fct = to_smu_fan(ct); |
| 91 | |
| 92 | if (value < fct->min) |
| 93 | value = fct->min; |
| 94 | if (value > fct->max) |
| 95 | value = fct->max; |
| 96 | fct->value = value; |
| 97 | |
| 98 | return smu_set_fan(fct->fan_type, fct->reg, value); |
| 99 | } |
| 100 | |
| 101 | static int smu_fan_get(struct wf_control *ct, s32 *value) |
| 102 | { |
| 103 | struct smu_fan_control *fct = to_smu_fan(ct); |
| 104 | *value = fct->value; /* todo: read from SMU */ |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static s32 smu_fan_min(struct wf_control *ct) |
| 109 | { |
| 110 | struct smu_fan_control *fct = to_smu_fan(ct); |
| 111 | return fct->min; |
| 112 | } |
| 113 | |
| 114 | static s32 smu_fan_max(struct wf_control *ct) |
| 115 | { |
| 116 | struct smu_fan_control *fct = to_smu_fan(ct); |
| 117 | return fct->max; |
| 118 | } |
| 119 | |
| 120 | static struct wf_control_ops smu_fan_ops = { |
| 121 | .set_value = smu_fan_set, |
| 122 | .get_value = smu_fan_get, |
| 123 | .get_min = smu_fan_min, |
| 124 | .get_max = smu_fan_max, |
| 125 | .release = smu_fan_release, |
| 126 | .owner = THIS_MODULE, |
| 127 | }; |
| 128 | |
| 129 | static struct smu_fan_control *smu_fan_create(struct device_node *node, |
| 130 | int pwm_fan) |
| 131 | { |
| 132 | struct smu_fan_control *fct; |
| 133 | s32 *v; u32 *reg; |
| 134 | char *l; |
| 135 | |
| 136 | fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL); |
| 137 | if (fct == NULL) |
| 138 | return NULL; |
| 139 | fct->ctrl.ops = &smu_fan_ops; |
| 140 | l = (char *)get_property(node, "location", NULL); |
| 141 | if (l == NULL) |
| 142 | goto fail; |
| 143 | |
| 144 | fct->fan_type = pwm_fan; |
| 145 | fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN; |
| 146 | |
| 147 | /* We use the name & location here the same way we do for SMU sensors, |
| 148 | * see the comment in windfarm_smu_sensors.c. The locations are a bit |
| 149 | * less consistent here between the iMac and the desktop models, but |
| 150 | * that is good enough for our needs for now at least. |
| 151 | * |
| 152 | * One problem though is that Apple seem to be inconsistent with case |
| 153 | * and the kernel doesn't have strcasecmp =P |
| 154 | */ |
| 155 | |
| 156 | fct->ctrl.name = NULL; |
| 157 | |
| 158 | /* Names used on desktop models */ |
| 159 | if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") || |
| 160 | !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan")) |
| 161 | fct->ctrl.name = "cpu-rear-fan-0"; |
| 162 | else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1")) |
| 163 | fct->ctrl.name = "cpu-rear-fan-1"; |
| 164 | else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") || |
| 165 | !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan")) |
| 166 | fct->ctrl.name = "cpu-front-fan-0"; |
| 167 | else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1")) |
| 168 | fct->ctrl.name = "cpu-front-fan-1"; |
| 169 | else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan")) |
| 170 | fct->ctrl.name = "slots-fan"; |
| 171 | else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay")) |
| 172 | fct->ctrl.name = "drive-bay-fan"; |
| 173 | |
| 174 | /* Names used on iMac models */ |
| 175 | if (!strcmp(l, "System Fan") || !strcmp(l, "System fan")) |
| 176 | fct->ctrl.name = "system-fan"; |
| 177 | else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan")) |
| 178 | fct->ctrl.name = "cpu-fan"; |
| 179 | else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive")) |
| 180 | fct->ctrl.name = "drive-bay-fan"; |
| 181 | |
| 182 | /* Unrecognized fan, bail out */ |
| 183 | if (fct->ctrl.name == NULL) |
| 184 | goto fail; |
| 185 | |
| 186 | /* Get min & max values*/ |
| 187 | v = (s32 *)get_property(node, "min-value", NULL); |
| 188 | if (v == NULL) |
| 189 | goto fail; |
| 190 | fct->min = *v; |
| 191 | v = (s32 *)get_property(node, "max-value", NULL); |
| 192 | if (v == NULL) |
| 193 | goto fail; |
| 194 | fct->max = *v; |
| 195 | |
| 196 | /* Get "reg" value */ |
| 197 | reg = (u32 *)get_property(node, "reg", NULL); |
| 198 | if (reg == NULL) |
| 199 | goto fail; |
| 200 | fct->reg = *reg; |
| 201 | |
| 202 | if (wf_register_control(&fct->ctrl)) |
| 203 | goto fail; |
| 204 | |
| 205 | return fct; |
| 206 | fail: |
| 207 | kfree(fct); |
| 208 | return NULL; |
| 209 | } |
| 210 | |
| 211 | |
| 212 | static int __init smu_controls_init(void) |
| 213 | { |
| 214 | struct device_node *smu, *fans, *fan; |
| 215 | |
| 216 | if (!smu_present()) |
| 217 | return -ENODEV; |
| 218 | |
| 219 | smu = of_find_node_by_type(NULL, "smu"); |
| 220 | if (smu == NULL) |
| 221 | return -ENODEV; |
| 222 | |
| 223 | /* Look for RPM fans */ |
| 224 | for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) |
| 225 | if (!strcmp(fans->name, "rpm-fans")) |
| 226 | break; |
| 227 | for (fan = NULL; |
| 228 | fans && (fan = of_get_next_child(fans, fan)) != NULL;) { |
| 229 | struct smu_fan_control *fct; |
| 230 | |
| 231 | fct = smu_fan_create(fan, 0); |
| 232 | if (fct == NULL) { |
| 233 | printk(KERN_WARNING "windfarm: Failed to create SMU " |
| 234 | "RPM fan %s\n", fan->name); |
| 235 | continue; |
| 236 | } |
| 237 | list_add(&fct->link, &smu_fans); |
| 238 | } |
| 239 | of_node_put(fans); |
| 240 | |
| 241 | |
| 242 | /* Look for PWM fans */ |
| 243 | for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) |
| 244 | if (!strcmp(fans->name, "pwm-fans")) |
| 245 | break; |
| 246 | for (fan = NULL; |
| 247 | fans && (fan = of_get_next_child(fans, fan)) != NULL;) { |
| 248 | struct smu_fan_control *fct; |
| 249 | |
| 250 | fct = smu_fan_create(fan, 1); |
| 251 | if (fct == NULL) { |
| 252 | printk(KERN_WARNING "windfarm: Failed to create SMU " |
| 253 | "PWM fan %s\n", fan->name); |
| 254 | continue; |
| 255 | } |
| 256 | list_add(&fct->link, &smu_fans); |
| 257 | } |
| 258 | of_node_put(fans); |
| 259 | of_node_put(smu); |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | static void __exit smu_controls_exit(void) |
| 265 | { |
| 266 | struct smu_fan_control *fct; |
| 267 | |
| 268 | while (!list_empty(&smu_fans)) { |
| 269 | fct = list_entry(smu_fans.next, struct smu_fan_control, link); |
| 270 | list_del(&fct->link); |
| 271 | wf_unregister_control(&fct->ctrl); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | |
| 276 | module_init(smu_controls_init); |
| 277 | module_exit(smu_controls_exit); |
| 278 | |
| 279 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); |
| 280 | MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control"); |
| 281 | MODULE_LICENSE("GPL"); |
| 282 | |