Commit | Line | Data |
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4350147a BH |
1 | /* |
2 | * Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
3 | * and Markus Demleitner <msdemlei@cl.uni-heidelberg.de> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This driver adds basic cpufreq support for SMU & 970FX based G5 Macs, | |
10 | * that is iMac G5 and latest single CPU desktop. | |
11 | */ | |
12 | ||
7ed14c21 BH |
13 | #undef DEBUG |
14 | ||
4350147a BH |
15 | #include <linux/module.h> |
16 | #include <linux/types.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/cpufreq.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/completion.h> | |
14cc3e2b | 25 | #include <linux/mutex.h> |
4350147a BH |
26 | #include <asm/prom.h> |
27 | #include <asm/machdep.h> | |
28 | #include <asm/irq.h> | |
29 | #include <asm/sections.h> | |
30 | #include <asm/cputable.h> | |
31 | #include <asm/time.h> | |
32 | #include <asm/smu.h> | |
9a699aef | 33 | #include <asm/pmac_pfunc.h> |
4350147a | 34 | |
7ed14c21 | 35 | #define DBG(fmt...) pr_debug(fmt) |
4350147a BH |
36 | |
37 | /* see 970FX user manual */ | |
38 | ||
39 | #define SCOM_PCR 0x0aa001 /* PCR scom addr */ | |
40 | ||
41 | #define PCR_HILO_SELECT 0x80000000U /* 1 = PCR, 0 = PCRH */ | |
42 | #define PCR_SPEED_FULL 0x00000000U /* 1:1 speed value */ | |
43 | #define PCR_SPEED_HALF 0x00020000U /* 1:2 speed value */ | |
44 | #define PCR_SPEED_QUARTER 0x00040000U /* 1:4 speed value */ | |
45 | #define PCR_SPEED_MASK 0x000e0000U /* speed mask */ | |
46 | #define PCR_SPEED_SHIFT 17 | |
47 | #define PCR_FREQ_REQ_VALID 0x00010000U /* freq request valid */ | |
48 | #define PCR_VOLT_REQ_VALID 0x00008000U /* volt request valid */ | |
49 | #define PCR_TARGET_TIME_MASK 0x00006000U /* target time */ | |
50 | #define PCR_STATLAT_MASK 0x00001f00U /* STATLAT value */ | |
51 | #define PCR_SNOOPLAT_MASK 0x000000f0U /* SNOOPLAT value */ | |
52 | #define PCR_SNOOPACC_MASK 0x0000000fU /* SNOOPACC value */ | |
53 | ||
54 | #define SCOM_PSR 0x408001 /* PSR scom addr */ | |
55 | /* warning: PSR is a 64 bits register */ | |
56 | #define PSR_CMD_RECEIVED 0x2000000000000000U /* command received */ | |
57 | #define PSR_CMD_COMPLETED 0x1000000000000000U /* command completed */ | |
58 | #define PSR_CUR_SPEED_MASK 0x0300000000000000U /* current speed */ | |
59 | #define PSR_CUR_SPEED_SHIFT (56) | |
60 | ||
61 | /* | |
62 | * The G5 only supports two frequencies (Quarter speed is not supported) | |
63 | */ | |
64 | #define CPUFREQ_HIGH 0 | |
65 | #define CPUFREQ_LOW 1 | |
66 | ||
67 | static struct cpufreq_frequency_table g5_cpu_freqs[] = { | |
68 | {CPUFREQ_HIGH, 0}, | |
69 | {CPUFREQ_LOW, 0}, | |
70 | {0, CPUFREQ_TABLE_END}, | |
71 | }; | |
72 | ||
73 | static struct freq_attr* g5_cpu_freqs_attr[] = { | |
74 | &cpufreq_freq_attr_scaling_available_freqs, | |
75 | NULL, | |
76 | }; | |
77 | ||
78 | /* Power mode data is an array of the 32 bits PCR values to use for | |
943ffb58 | 79 | * the various frequencies, retrieved from the device-tree |
4350147a | 80 | */ |
4350147a BH |
81 | static int g5_pmode_cur; |
82 | ||
9a699aef BH |
83 | static void (*g5_switch_volt)(int speed_mode); |
84 | static int (*g5_switch_freq)(int speed_mode); | |
85 | static int (*g5_query_freq)(void); | |
86 | ||
14cc3e2b | 87 | static DEFINE_MUTEX(g5_switch_mutex); |
4350147a BH |
88 | |
89 | ||
e272a285 | 90 | #ifdef CONFIG_PMAC_SMU |
7ed14c21 | 91 | |
e272a285 | 92 | static u32 *g5_pmode_data; |
7ed14c21 BH |
93 | static int g5_pmode_max; |
94 | ||
4350147a BH |
95 | static struct smu_sdbp_fvt *g5_fvt_table; /* table of op. points */ |
96 | static int g5_fvt_count; /* number of op. points */ | |
97 | static int g5_fvt_cur; /* current op. point */ | |
98 | ||
9a699aef BH |
99 | /* |
100 | * SMU based voltage switching for Neo2 platforms | |
101 | */ | |
4350147a | 102 | |
9a699aef | 103 | static void g5_smu_switch_volt(int speed_mode) |
4350147a BH |
104 | { |
105 | struct smu_simple_cmd cmd; | |
106 | ||
107 | DECLARE_COMPLETION(comp); | |
108 | smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, smu_done_complete, | |
109 | &comp, 'V', 'S', 'L', 'E', 'W', | |
110 | 0xff, g5_fvt_cur+1, speed_mode); | |
111 | wait_for_completion(&comp); | |
112 | } | |
113 | ||
9a699aef BH |
114 | /* |
115 | * Platform function based voltage/vdnap switching for Neo2 | |
116 | */ | |
117 | ||
118 | static struct pmf_function *pfunc_set_vdnap0; | |
119 | static struct pmf_function *pfunc_vdnap0_complete; | |
120 | ||
121 | static void g5_vdnap_switch_volt(int speed_mode) | |
4350147a | 122 | { |
9a699aef BH |
123 | struct pmf_args args; |
124 | u32 slew, done = 0; | |
125 | unsigned long timeout; | |
4350147a | 126 | |
9a699aef BH |
127 | slew = (speed_mode == CPUFREQ_LOW) ? 1 : 0; |
128 | args.count = 1; | |
129 | args.u[0].p = &slew; | |
4350147a | 130 | |
9a699aef | 131 | pmf_call_one(pfunc_set_vdnap0, &args); |
4350147a | 132 | |
9a699aef BH |
133 | /* It's an irq GPIO so we should be able to just block here, |
134 | * I'll do that later after I've properly tested the IRQ code for | |
135 | * platform functions | |
136 | */ | |
137 | timeout = jiffies + HZ/10; | |
138 | while(!time_after(jiffies, timeout)) { | |
139 | args.count = 1; | |
140 | args.u[0].p = &done; | |
141 | pmf_call_one(pfunc_vdnap0_complete, &args); | |
142 | if (done) | |
143 | break; | |
144 | msleep(1); | |
145 | } | |
146 | if (done == 0) | |
147 | printk(KERN_WARNING "cpufreq: Timeout in clock slewing !\n"); | |
148 | } | |
4350147a | 149 | |
9a699aef BH |
150 | |
151 | /* | |
152 | * SCOM based frequency switching for 970FX rev3 | |
153 | */ | |
154 | static int g5_scom_switch_freq(int speed_mode) | |
155 | { | |
156 | unsigned long flags; | |
157 | int to; | |
4350147a BH |
158 | |
159 | /* If frequency is going up, first ramp up the voltage */ | |
160 | if (speed_mode < g5_pmode_cur) | |
161 | g5_switch_volt(speed_mode); | |
162 | ||
9a699aef BH |
163 | local_irq_save(flags); |
164 | ||
4350147a BH |
165 | /* Clear PCR high */ |
166 | scom970_write(SCOM_PCR, 0); | |
167 | /* Clear PCR low */ | |
168 | scom970_write(SCOM_PCR, PCR_HILO_SELECT | 0); | |
169 | /* Set PCR low */ | |
170 | scom970_write(SCOM_PCR, PCR_HILO_SELECT | | |
171 | g5_pmode_data[speed_mode]); | |
172 | ||
173 | /* Wait for completion */ | |
174 | for (to = 0; to < 10; to++) { | |
175 | unsigned long psr = scom970_read(SCOM_PSR); | |
176 | ||
177 | if ((psr & PSR_CMD_RECEIVED) == 0 && | |
178 | (((psr >> PSR_CUR_SPEED_SHIFT) ^ | |
179 | (g5_pmode_data[speed_mode] >> PCR_SPEED_SHIFT)) & 0x3) | |
180 | == 0) | |
181 | break; | |
182 | if (psr & PSR_CMD_COMPLETED) | |
183 | break; | |
184 | udelay(100); | |
185 | } | |
186 | ||
9a699aef BH |
187 | local_irq_restore(flags); |
188 | ||
4350147a BH |
189 | /* If frequency is going down, last ramp the voltage */ |
190 | if (speed_mode > g5_pmode_cur) | |
191 | g5_switch_volt(speed_mode); | |
192 | ||
193 | g5_pmode_cur = speed_mode; | |
194 | ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul; | |
195 | ||
4350147a BH |
196 | return 0; |
197 | } | |
198 | ||
9a699aef | 199 | static int g5_scom_query_freq(void) |
4350147a BH |
200 | { |
201 | unsigned long psr = scom970_read(SCOM_PSR); | |
202 | int i; | |
203 | ||
204 | for (i = 0; i <= g5_pmode_max; i++) | |
205 | if ((((psr >> PSR_CUR_SPEED_SHIFT) ^ | |
206 | (g5_pmode_data[i] >> PCR_SPEED_SHIFT)) & 0x3) == 0) | |
207 | break; | |
208 | return i; | |
209 | } | |
210 | ||
7ed14c21 BH |
211 | /* |
212 | * Fake voltage switching for platforms with missing support | |
213 | */ | |
214 | ||
215 | static void g5_dummy_switch_volt(int speed_mode) | |
216 | { | |
217 | } | |
218 | ||
e272a285 | 219 | #endif /* CONFIG_PMAC_SMU */ |
7ed14c21 | 220 | |
9a699aef BH |
221 | /* |
222 | * Platform function based voltage switching for PowerMac7,2 & 7,3 | |
223 | */ | |
224 | ||
225 | static struct pmf_function *pfunc_cpu0_volt_high; | |
226 | static struct pmf_function *pfunc_cpu0_volt_low; | |
227 | static struct pmf_function *pfunc_cpu1_volt_high; | |
228 | static struct pmf_function *pfunc_cpu1_volt_low; | |
229 | ||
230 | static void g5_pfunc_switch_volt(int speed_mode) | |
231 | { | |
232 | if (speed_mode == CPUFREQ_HIGH) { | |
233 | if (pfunc_cpu0_volt_high) | |
234 | pmf_call_one(pfunc_cpu0_volt_high, NULL); | |
235 | if (pfunc_cpu1_volt_high) | |
236 | pmf_call_one(pfunc_cpu1_volt_high, NULL); | |
237 | } else { | |
238 | if (pfunc_cpu0_volt_low) | |
239 | pmf_call_one(pfunc_cpu0_volt_low, NULL); | |
240 | if (pfunc_cpu1_volt_low) | |
241 | pmf_call_one(pfunc_cpu1_volt_low, NULL); | |
242 | } | |
243 | msleep(10); /* should be faster , to fix */ | |
244 | } | |
245 | ||
246 | /* | |
247 | * Platform function based frequency switching for PowerMac7,2 & 7,3 | |
248 | */ | |
249 | ||
250 | static struct pmf_function *pfunc_cpu_setfreq_high; | |
251 | static struct pmf_function *pfunc_cpu_setfreq_low; | |
252 | static struct pmf_function *pfunc_cpu_getfreq; | |
253 | static struct pmf_function *pfunc_slewing_done;; | |
254 | ||
255 | static int g5_pfunc_switch_freq(int speed_mode) | |
256 | { | |
257 | struct pmf_args args; | |
258 | u32 done = 0; | |
259 | unsigned long timeout; | |
7ed14c21 BH |
260 | int rc; |
261 | ||
262 | DBG("g5_pfunc_switch_freq(%d)\n", speed_mode); | |
9a699aef BH |
263 | |
264 | /* If frequency is going up, first ramp up the voltage */ | |
265 | if (speed_mode < g5_pmode_cur) | |
266 | g5_switch_volt(speed_mode); | |
267 | ||
268 | /* Do it */ | |
269 | if (speed_mode == CPUFREQ_HIGH) | |
7ed14c21 | 270 | rc = pmf_call_one(pfunc_cpu_setfreq_high, NULL); |
9a699aef | 271 | else |
7ed14c21 BH |
272 | rc = pmf_call_one(pfunc_cpu_setfreq_low, NULL); |
273 | ||
274 | if (rc) | |
275 | printk(KERN_WARNING "cpufreq: pfunc switch error %d\n", rc); | |
9a699aef BH |
276 | |
277 | /* It's an irq GPIO so we should be able to just block here, | |
278 | * I'll do that later after I've properly tested the IRQ code for | |
279 | * platform functions | |
280 | */ | |
281 | timeout = jiffies + HZ/10; | |
282 | while(!time_after(jiffies, timeout)) { | |
283 | args.count = 1; | |
284 | args.u[0].p = &done; | |
285 | pmf_call_one(pfunc_slewing_done, &args); | |
286 | if (done) | |
287 | break; | |
288 | msleep(1); | |
289 | } | |
290 | if (done == 0) | |
291 | printk(KERN_WARNING "cpufreq: Timeout in clock slewing !\n"); | |
292 | ||
293 | /* If frequency is going down, last ramp the voltage */ | |
294 | if (speed_mode > g5_pmode_cur) | |
295 | g5_switch_volt(speed_mode); | |
296 | ||
297 | g5_pmode_cur = speed_mode; | |
298 | ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static int g5_pfunc_query_freq(void) | |
304 | { | |
305 | struct pmf_args args; | |
306 | u32 val = 0; | |
307 | ||
308 | args.count = 1; | |
309 | args.u[0].p = &val; | |
310 | pmf_call_one(pfunc_cpu_getfreq, &args); | |
311 | return val ? CPUFREQ_HIGH : CPUFREQ_LOW; | |
312 | } | |
313 | ||
9a699aef BH |
314 | |
315 | /* | |
316 | * Common interface to the cpufreq core | |
317 | */ | |
4350147a BH |
318 | |
319 | static int g5_cpufreq_verify(struct cpufreq_policy *policy) | |
320 | { | |
321 | return cpufreq_frequency_table_verify(policy, g5_cpu_freqs); | |
322 | } | |
323 | ||
324 | static int g5_cpufreq_target(struct cpufreq_policy *policy, | |
325 | unsigned int target_freq, unsigned int relation) | |
326 | { | |
9a699aef BH |
327 | unsigned int newstate = 0; |
328 | struct cpufreq_freqs freqs; | |
329 | int rc; | |
4350147a BH |
330 | |
331 | if (cpufreq_frequency_table_target(policy, g5_cpu_freqs, | |
332 | target_freq, relation, &newstate)) | |
333 | return -EINVAL; | |
334 | ||
9a699aef BH |
335 | if (g5_pmode_cur == newstate) |
336 | return 0; | |
337 | ||
14cc3e2b | 338 | mutex_lock(&g5_switch_mutex); |
9a699aef BH |
339 | |
340 | freqs.old = g5_cpu_freqs[g5_pmode_cur].frequency; | |
341 | freqs.new = g5_cpu_freqs[newstate].frequency; | |
342 | freqs.cpu = 0; | |
343 | ||
344 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
345 | rc = g5_switch_freq(newstate); | |
346 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
347 | ||
14cc3e2b | 348 | mutex_unlock(&g5_switch_mutex); |
9a699aef BH |
349 | |
350 | return rc; | |
4350147a BH |
351 | } |
352 | ||
353 | static unsigned int g5_cpufreq_get_speed(unsigned int cpu) | |
354 | { | |
355 | return g5_cpu_freqs[g5_pmode_cur].frequency; | |
356 | } | |
357 | ||
358 | static int g5_cpufreq_cpu_init(struct cpufreq_policy *policy) | |
359 | { | |
360 | if (policy->cpu != 0) | |
361 | return -ENODEV; | |
362 | ||
363 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; | |
364 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; | |
365 | policy->cur = g5_cpu_freqs[g5_query_freq()].frequency; | |
9a699aef | 366 | policy->cpus = cpu_possible_map; |
4350147a BH |
367 | cpufreq_frequency_table_get_attr(g5_cpu_freqs, policy->cpu); |
368 | ||
369 | return cpufreq_frequency_table_cpuinfo(policy, | |
370 | g5_cpu_freqs); | |
371 | } | |
372 | ||
373 | ||
374 | static struct cpufreq_driver g5_cpufreq_driver = { | |
375 | .name = "powermac", | |
376 | .owner = THIS_MODULE, | |
377 | .flags = CPUFREQ_CONST_LOOPS, | |
378 | .init = g5_cpufreq_cpu_init, | |
379 | .verify = g5_cpufreq_verify, | |
380 | .target = g5_cpufreq_target, | |
381 | .get = g5_cpufreq_get_speed, | |
382 | .attr = g5_cpu_freqs_attr, | |
383 | }; | |
384 | ||
385 | ||
e272a285 | 386 | #ifdef CONFIG_PMAC_SMU |
7ed14c21 | 387 | |
9a699aef | 388 | static int __init g5_neo2_cpufreq_init(struct device_node *cpus) |
4350147a BH |
389 | { |
390 | struct device_node *cpunode; | |
391 | unsigned int psize, ssize; | |
4350147a | 392 | unsigned long max_freq; |
9a699aef | 393 | char *freq_method, *volt_method; |
018a3d1d JK |
394 | const u32 *valp; |
395 | u32 pvr_hi; | |
9a699aef BH |
396 | int use_volts_vdnap = 0; |
397 | int use_volts_smu = 0; | |
4350147a BH |
398 | int rc = -ENODEV; |
399 | ||
9a699aef BH |
400 | /* Check supported platforms */ |
401 | if (machine_is_compatible("PowerMac8,1") || | |
402 | machine_is_compatible("PowerMac8,2") || | |
403 | machine_is_compatible("PowerMac9,1")) | |
404 | use_volts_smu = 1; | |
405 | else if (machine_is_compatible("PowerMac11,2")) | |
406 | use_volts_vdnap = 1; | |
407 | else | |
408 | return -ENODEV; | |
409 | ||
410 | /* Get first CPU node */ | |
411 | for (cpunode = NULL; | |
412 | (cpunode = of_get_next_child(cpus, cpunode)) != NULL;) { | |
018a3d1d | 413 | const u32 *reg = get_property(cpunode, "reg", NULL); |
9a699aef BH |
414 | if (reg == NULL || (*reg) != 0) |
415 | continue; | |
416 | if (!strcmp(cpunode->type, "cpu")) | |
417 | break; | |
418 | } | |
419 | if (cpunode == NULL) { | |
420 | printk(KERN_ERR "cpufreq: Can't find any CPU 0 node\n"); | |
4350147a BH |
421 | return -ENODEV; |
422 | } | |
423 | ||
424 | /* Check 970FX for now */ | |
018a3d1d | 425 | valp = get_property(cpunode, "cpu-version", NULL); |
4350147a BH |
426 | if (!valp) { |
427 | DBG("No cpu-version property !\n"); | |
428 | goto bail_noprops; | |
429 | } | |
9a699aef BH |
430 | pvr_hi = (*valp) >> 16; |
431 | if (pvr_hi != 0x3c && pvr_hi != 0x44) { | |
432 | printk(KERN_ERR "cpufreq: Unsupported CPU version\n"); | |
4350147a BH |
433 | goto bail_noprops; |
434 | } | |
435 | ||
436 | /* Look for the powertune data in the device-tree */ | |
018a3d1d | 437 | g5_pmode_data = get_property(cpunode, "power-mode-data",&psize); |
4350147a BH |
438 | if (!g5_pmode_data) { |
439 | DBG("No power-mode-data !\n"); | |
440 | goto bail_noprops; | |
441 | } | |
442 | g5_pmode_max = psize / sizeof(u32) - 1; | |
443 | ||
9a699aef | 444 | if (use_volts_smu) { |
018a3d1d | 445 | const struct smu_sdbp_header *shdr; |
9a699aef BH |
446 | |
447 | /* Look for the FVT table */ | |
448 | shdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); | |
449 | if (!shdr) | |
450 | goto bail_noprops; | |
451 | g5_fvt_table = (struct smu_sdbp_fvt *)&shdr[1]; | |
452 | ssize = (shdr->len * sizeof(u32)) - | |
453 | sizeof(struct smu_sdbp_header); | |
454 | g5_fvt_count = ssize / sizeof(struct smu_sdbp_fvt); | |
455 | g5_fvt_cur = 0; | |
456 | ||
457 | /* Sanity checking */ | |
458 | if (g5_fvt_count < 1 || g5_pmode_max < 1) | |
459 | goto bail_noprops; | |
460 | ||
461 | g5_switch_volt = g5_smu_switch_volt; | |
462 | volt_method = "SMU"; | |
463 | } else if (use_volts_vdnap) { | |
464 | struct device_node *root; | |
465 | ||
466 | root = of_find_node_by_path("/"); | |
467 | if (root == NULL) { | |
468 | printk(KERN_ERR "cpufreq: Can't find root of " | |
469 | "device tree\n"); | |
470 | goto bail_noprops; | |
471 | } | |
472 | pfunc_set_vdnap0 = pmf_find_function(root, "set-vdnap0"); | |
473 | pfunc_vdnap0_complete = | |
474 | pmf_find_function(root, "slewing-done"); | |
475 | if (pfunc_set_vdnap0 == NULL || | |
476 | pfunc_vdnap0_complete == NULL) { | |
477 | printk(KERN_ERR "cpufreq: Can't find required " | |
478 | "platform function\n"); | |
479 | goto bail_noprops; | |
480 | } | |
481 | ||
482 | g5_switch_volt = g5_vdnap_switch_volt; | |
483 | volt_method = "GPIO"; | |
484 | } else { | |
485 | g5_switch_volt = g5_dummy_switch_volt; | |
486 | volt_method = "none"; | |
487 | } | |
4350147a BH |
488 | |
489 | /* | |
490 | * From what I see, clock-frequency is always the maximal frequency. | |
491 | * The current driver can not slew sysclk yet, so we really only deal | |
492 | * with powertune steps for now. We also only implement full freq and | |
493 | * half freq in this version. So far, I haven't yet seen a machine | |
494 | * supporting anything else. | |
495 | */ | |
018a3d1d | 496 | valp = get_property(cpunode, "clock-frequency", NULL); |
4350147a BH |
497 | if (!valp) |
498 | return -ENODEV; | |
499 | max_freq = (*valp)/1000; | |
500 | g5_cpu_freqs[0].frequency = max_freq; | |
501 | g5_cpu_freqs[1].frequency = max_freq/2; | |
502 | ||
9a699aef BH |
503 | /* Set callbacks */ |
504 | g5_switch_freq = g5_scom_switch_freq; | |
505 | g5_query_freq = g5_scom_query_freq; | |
506 | freq_method = "SCOM"; | |
4350147a BH |
507 | |
508 | /* Force apply current frequency to make sure everything is in | |
509 | * sync (voltage is right for example). Firmware may leave us with | |
510 | * a strange setting ... | |
511 | */ | |
9a699aef BH |
512 | g5_switch_volt(CPUFREQ_HIGH); |
513 | msleep(10); | |
514 | g5_pmode_cur = -1; | |
515 | g5_switch_freq(g5_query_freq()); | |
4350147a BH |
516 | |
517 | printk(KERN_INFO "Registering G5 CPU frequency driver\n"); | |
9a699aef BH |
518 | printk(KERN_INFO "Frequency method: %s, Voltage method: %s\n", |
519 | freq_method, volt_method); | |
4350147a BH |
520 | printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n", |
521 | g5_cpu_freqs[1].frequency/1000, | |
522 | g5_cpu_freqs[0].frequency/1000, | |
523 | g5_cpu_freqs[g5_pmode_cur].frequency/1000); | |
524 | ||
525 | rc = cpufreq_register_driver(&g5_cpufreq_driver); | |
526 | ||
527 | /* We keep the CPU node on hold... hopefully, Apple G5 don't have | |
528 | * hotplug CPU with a dynamic device-tree ... | |
529 | */ | |
530 | return rc; | |
531 | ||
532 | bail_noprops: | |
533 | of_node_put(cpunode); | |
534 | ||
535 | return rc; | |
536 | } | |
537 | ||
e272a285 | 538 | #endif /* CONFIG_PMAC_SMU */ |
7ed14c21 BH |
539 | |
540 | ||
9a699aef BH |
541 | static int __init g5_pm72_cpufreq_init(struct device_node *cpus) |
542 | { | |
543 | struct device_node *cpuid = NULL, *hwclock = NULL, *cpunode = NULL; | |
018a3d1d JK |
544 | const u8 *eeprom = NULL; |
545 | const u32 *valp; | |
9a699aef BH |
546 | u64 max_freq, min_freq, ih, il; |
547 | int has_volt = 1, rc = 0; | |
548 | ||
7ed14c21 BH |
549 | DBG("cpufreq: Initializing for PowerMac7,2, PowerMac7,3 and" |
550 | " RackMac3,1...\n"); | |
551 | ||
9a699aef BH |
552 | /* Get first CPU node */ |
553 | for (cpunode = NULL; | |
554 | (cpunode = of_get_next_child(cpus, cpunode)) != NULL;) { | |
555 | if (!strcmp(cpunode->type, "cpu")) | |
556 | break; | |
557 | } | |
558 | if (cpunode == NULL) { | |
559 | printk(KERN_ERR "cpufreq: Can't find any CPU node\n"); | |
560 | return -ENODEV; | |
561 | } | |
562 | ||
563 | /* Lookup the cpuid eeprom node */ | |
564 | cpuid = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/cpuid@a0"); | |
565 | if (cpuid != NULL) | |
018a3d1d | 566 | eeprom = get_property(cpuid, "cpuid", NULL); |
9a699aef BH |
567 | if (eeprom == NULL) { |
568 | printk(KERN_ERR "cpufreq: Can't find cpuid EEPROM !\n"); | |
569 | rc = -ENODEV; | |
570 | goto bail; | |
571 | } | |
572 | ||
573 | /* Lookup the i2c hwclock */ | |
574 | for (hwclock = NULL; | |
575 | (hwclock = of_find_node_by_name(hwclock, "i2c-hwclock")) != NULL;){ | |
018a3d1d JK |
576 | const char *loc = get_property(hwclock, |
577 | "hwctrl-location", NULL); | |
9a699aef BH |
578 | if (loc == NULL) |
579 | continue; | |
580 | if (strcmp(loc, "CPU CLOCK")) | |
581 | continue; | |
582 | if (!get_property(hwclock, "platform-get-frequency", NULL)) | |
583 | continue; | |
584 | break; | |
585 | } | |
586 | if (hwclock == NULL) { | |
587 | printk(KERN_ERR "cpufreq: Can't find i2c clock chip !\n"); | |
588 | rc = -ENODEV; | |
589 | goto bail; | |
590 | } | |
591 | ||
592 | DBG("cpufreq: i2c clock chip found: %s\n", hwclock->full_name); | |
593 | ||
594 | /* Now get all the platform functions */ | |
595 | pfunc_cpu_getfreq = | |
596 | pmf_find_function(hwclock, "get-frequency"); | |
597 | pfunc_cpu_setfreq_high = | |
598 | pmf_find_function(hwclock, "set-frequency-high"); | |
599 | pfunc_cpu_setfreq_low = | |
600 | pmf_find_function(hwclock, "set-frequency-low"); | |
601 | pfunc_slewing_done = | |
602 | pmf_find_function(hwclock, "slewing-done"); | |
603 | pfunc_cpu0_volt_high = | |
604 | pmf_find_function(hwclock, "set-voltage-high-0"); | |
605 | pfunc_cpu0_volt_low = | |
606 | pmf_find_function(hwclock, "set-voltage-low-0"); | |
607 | pfunc_cpu1_volt_high = | |
608 | pmf_find_function(hwclock, "set-voltage-high-1"); | |
609 | pfunc_cpu1_volt_low = | |
610 | pmf_find_function(hwclock, "set-voltage-low-1"); | |
611 | ||
612 | /* Check we have minimum requirements */ | |
613 | if (pfunc_cpu_getfreq == NULL || pfunc_cpu_setfreq_high == NULL || | |
614 | pfunc_cpu_setfreq_low == NULL || pfunc_slewing_done == NULL) { | |
615 | printk(KERN_ERR "cpufreq: Can't find platform functions !\n"); | |
616 | rc = -ENODEV; | |
617 | goto bail; | |
618 | } | |
619 | ||
620 | /* Check that we have complete sets */ | |
621 | if (pfunc_cpu0_volt_high == NULL || pfunc_cpu0_volt_low == NULL) { | |
622 | pmf_put_function(pfunc_cpu0_volt_high); | |
623 | pmf_put_function(pfunc_cpu0_volt_low); | |
624 | pfunc_cpu0_volt_high = pfunc_cpu0_volt_low = NULL; | |
625 | has_volt = 0; | |
626 | } | |
627 | if (!has_volt || | |
628 | pfunc_cpu1_volt_high == NULL || pfunc_cpu1_volt_low == NULL) { | |
629 | pmf_put_function(pfunc_cpu1_volt_high); | |
630 | pmf_put_function(pfunc_cpu1_volt_low); | |
631 | pfunc_cpu1_volt_high = pfunc_cpu1_volt_low = NULL; | |
632 | } | |
633 | ||
634 | /* Note: The device tree also contains a "platform-set-values" | |
635 | * function for which I haven't quite figured out the usage. It | |
636 | * might have to be called on init and/or wakeup, I'm not too sure | |
637 | * but things seem to work fine without it so far ... | |
638 | */ | |
639 | ||
640 | /* Get max frequency from device-tree */ | |
018a3d1d | 641 | valp = get_property(cpunode, "clock-frequency", NULL); |
9a699aef BH |
642 | if (!valp) { |
643 | printk(KERN_ERR "cpufreq: Can't find CPU frequency !\n"); | |
644 | rc = -ENODEV; | |
645 | goto bail; | |
646 | } | |
647 | ||
648 | max_freq = (*valp)/1000; | |
649 | ||
650 | /* Now calculate reduced frequency by using the cpuid input freq | |
651 | * ratio. This requires 64 bits math unless we are willing to lose | |
652 | * some precision | |
653 | */ | |
654 | ih = *((u32 *)(eeprom + 0x10)); | |
655 | il = *((u32 *)(eeprom + 0x20)); | |
7ed14c21 BH |
656 | |
657 | /* Check for machines with no useful settings */ | |
658 | if (il == ih) { | |
659 | printk(KERN_WARNING "cpufreq: No low frequency mode available" | |
660 | " on this model !\n"); | |
661 | rc = -ENODEV; | |
662 | goto bail; | |
663 | } | |
664 | ||
9a699aef BH |
665 | min_freq = 0; |
666 | if (ih != 0 && il != 0) | |
667 | min_freq = (max_freq * il) / ih; | |
668 | ||
669 | /* Sanity check */ | |
670 | if (min_freq >= max_freq || min_freq < 1000) { | |
671 | printk(KERN_ERR "cpufreq: Can't calculate low frequency !\n"); | |
7ed14c21 | 672 | rc = -ENXIO; |
9a699aef BH |
673 | goto bail; |
674 | } | |
675 | g5_cpu_freqs[0].frequency = max_freq; | |
676 | g5_cpu_freqs[1].frequency = min_freq; | |
677 | ||
678 | /* Set callbacks */ | |
679 | g5_switch_volt = g5_pfunc_switch_volt; | |
680 | g5_switch_freq = g5_pfunc_switch_freq; | |
681 | g5_query_freq = g5_pfunc_query_freq; | |
682 | ||
683 | /* Force apply current frequency to make sure everything is in | |
684 | * sync (voltage is right for example). Firmware may leave us with | |
685 | * a strange setting ... | |
686 | */ | |
687 | g5_switch_volt(CPUFREQ_HIGH); | |
688 | msleep(10); | |
689 | g5_pmode_cur = -1; | |
690 | g5_switch_freq(g5_query_freq()); | |
691 | ||
692 | printk(KERN_INFO "Registering G5 CPU frequency driver\n"); | |
693 | printk(KERN_INFO "Frequency method: i2c/pfunc, " | |
694 | "Voltage method: %s\n", has_volt ? "i2c/pfunc" : "none"); | |
695 | printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n", | |
696 | g5_cpu_freqs[1].frequency/1000, | |
697 | g5_cpu_freqs[0].frequency/1000, | |
698 | g5_cpu_freqs[g5_pmode_cur].frequency/1000); | |
699 | ||
700 | rc = cpufreq_register_driver(&g5_cpufreq_driver); | |
701 | bail: | |
702 | if (rc != 0) { | |
703 | pmf_put_function(pfunc_cpu_getfreq); | |
704 | pmf_put_function(pfunc_cpu_setfreq_high); | |
705 | pmf_put_function(pfunc_cpu_setfreq_low); | |
706 | pmf_put_function(pfunc_slewing_done); | |
707 | pmf_put_function(pfunc_cpu0_volt_high); | |
708 | pmf_put_function(pfunc_cpu0_volt_low); | |
709 | pmf_put_function(pfunc_cpu1_volt_high); | |
710 | pmf_put_function(pfunc_cpu1_volt_low); | |
711 | } | |
712 | of_node_put(hwclock); | |
713 | of_node_put(cpuid); | |
714 | of_node_put(cpunode); | |
715 | ||
716 | return rc; | |
717 | } | |
718 | ||
9a699aef BH |
719 | static int __init g5_cpufreq_init(void) |
720 | { | |
721 | struct device_node *cpus; | |
7ed14c21 | 722 | int rc = 0; |
9a699aef BH |
723 | |
724 | cpus = of_find_node_by_path("/cpus"); | |
725 | if (cpus == NULL) { | |
726 | DBG("No /cpus node !\n"); | |
727 | return -ENODEV; | |
728 | } | |
729 | ||
730 | if (machine_is_compatible("PowerMac7,2") || | |
7ed14c21 BH |
731 | machine_is_compatible("PowerMac7,3") || |
732 | machine_is_compatible("RackMac3,1")) | |
9a699aef | 733 | rc = g5_pm72_cpufreq_init(cpus); |
e272a285 | 734 | #ifdef CONFIG_PMAC_SMU |
9a699aef BH |
735 | else |
736 | rc = g5_neo2_cpufreq_init(cpus); | |
e272a285 | 737 | #endif /* CONFIG_PMAC_SMU */ |
9a699aef BH |
738 | |
739 | of_node_put(cpus); | |
740 | return rc; | |
741 | } | |
742 | ||
4350147a BH |
743 | module_init(g5_cpufreq_init); |
744 | ||
745 | ||
746 | MODULE_LICENSE("GPL"); |