Commit | Line | Data |
---|---|---|
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 | ||
1c5864e2 JP |
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
16 | ||
4350147a BH |
17 | #include <linux/module.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/sched.h> | |
4350147a BH |
23 | #include <linux/cpufreq.h> |
24 | #include <linux/init.h> | |
25 | #include <linux/completion.h> | |
14cc3e2b | 26 | #include <linux/mutex.h> |
760287ab | 27 | #include <linux/of_device.h> |
4350147a BH |
28 | #include <asm/prom.h> |
29 | #include <asm/machdep.h> | |
30 | #include <asm/irq.h> | |
31 | #include <asm/sections.h> | |
32 | #include <asm/cputable.h> | |
33 | #include <asm/time.h> | |
34 | #include <asm/smu.h> | |
9a699aef | 35 | #include <asm/pmac_pfunc.h> |
4350147a | 36 | |
7ed14c21 | 37 | #define DBG(fmt...) pr_debug(fmt) |
4350147a BH |
38 | |
39 | /* see 970FX user manual */ | |
40 | ||
41 | #define SCOM_PCR 0x0aa001 /* PCR scom addr */ | |
42 | ||
43 | #define PCR_HILO_SELECT 0x80000000U /* 1 = PCR, 0 = PCRH */ | |
44 | #define PCR_SPEED_FULL 0x00000000U /* 1:1 speed value */ | |
45 | #define PCR_SPEED_HALF 0x00020000U /* 1:2 speed value */ | |
46 | #define PCR_SPEED_QUARTER 0x00040000U /* 1:4 speed value */ | |
47 | #define PCR_SPEED_MASK 0x000e0000U /* speed mask */ | |
48 | #define PCR_SPEED_SHIFT 17 | |
49 | #define PCR_FREQ_REQ_VALID 0x00010000U /* freq request valid */ | |
50 | #define PCR_VOLT_REQ_VALID 0x00008000U /* volt request valid */ | |
51 | #define PCR_TARGET_TIME_MASK 0x00006000U /* target time */ | |
52 | #define PCR_STATLAT_MASK 0x00001f00U /* STATLAT value */ | |
53 | #define PCR_SNOOPLAT_MASK 0x000000f0U /* SNOOPLAT value */ | |
54 | #define PCR_SNOOPACC_MASK 0x0000000fU /* SNOOPACC value */ | |
55 | ||
56 | #define SCOM_PSR 0x408001 /* PSR scom addr */ | |
57 | /* warning: PSR is a 64 bits register */ | |
58 | #define PSR_CMD_RECEIVED 0x2000000000000000U /* command received */ | |
59 | #define PSR_CMD_COMPLETED 0x1000000000000000U /* command completed */ | |
60 | #define PSR_CUR_SPEED_MASK 0x0300000000000000U /* current speed */ | |
61 | #define PSR_CUR_SPEED_SHIFT (56) | |
62 | ||
63 | /* | |
64 | * The G5 only supports two frequencies (Quarter speed is not supported) | |
65 | */ | |
66 | #define CPUFREQ_HIGH 0 | |
67 | #define CPUFREQ_LOW 1 | |
68 | ||
69 | static struct cpufreq_frequency_table g5_cpu_freqs[] = { | |
7f4b0461 VK |
70 | {0, CPUFREQ_HIGH, 0}, |
71 | {0, CPUFREQ_LOW, 0}, | |
72 | {0, 0, CPUFREQ_TABLE_END}, | |
4350147a BH |
73 | }; |
74 | ||
4350147a | 75 | /* Power mode data is an array of the 32 bits PCR values to use for |
943ffb58 | 76 | * the various frequencies, retrieved from the device-tree |
4350147a | 77 | */ |
4350147a BH |
78 | static int g5_pmode_cur; |
79 | ||
9a699aef BH |
80 | static void (*g5_switch_volt)(int speed_mode); |
81 | static int (*g5_switch_freq)(int speed_mode); | |
82 | static int (*g5_query_freq)(void); | |
83 | ||
16962e7c | 84 | static unsigned long transition_latency; |
4350147a | 85 | |
e272a285 | 86 | #ifdef CONFIG_PMAC_SMU |
7ed14c21 | 87 | |
9ca91e0f | 88 | static const u32 *g5_pmode_data; |
7ed14c21 BH |
89 | static int g5_pmode_max; |
90 | ||
4350147a BH |
91 | static struct smu_sdbp_fvt *g5_fvt_table; /* table of op. points */ |
92 | static int g5_fvt_count; /* number of op. points */ | |
93 | static int g5_fvt_cur; /* current op. point */ | |
94 | ||
9a699aef BH |
95 | /* |
96 | * SMU based voltage switching for Neo2 platforms | |
97 | */ | |
4350147a | 98 | |
9a699aef | 99 | static void g5_smu_switch_volt(int speed_mode) |
4350147a BH |
100 | { |
101 | struct smu_simple_cmd cmd; | |
102 | ||
6e9a4738 | 103 | DECLARE_COMPLETION_ONSTACK(comp); |
4350147a BH |
104 | smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, smu_done_complete, |
105 | &comp, 'V', 'S', 'L', 'E', 'W', | |
106 | 0xff, g5_fvt_cur+1, speed_mode); | |
107 | wait_for_completion(&comp); | |
108 | } | |
109 | ||
9a699aef BH |
110 | /* |
111 | * Platform function based voltage/vdnap switching for Neo2 | |
112 | */ | |
113 | ||
114 | static struct pmf_function *pfunc_set_vdnap0; | |
115 | static struct pmf_function *pfunc_vdnap0_complete; | |
116 | ||
117 | static void g5_vdnap_switch_volt(int speed_mode) | |
4350147a | 118 | { |
9a699aef BH |
119 | struct pmf_args args; |
120 | u32 slew, done = 0; | |
121 | unsigned long timeout; | |
4350147a | 122 | |
9a699aef BH |
123 | slew = (speed_mode == CPUFREQ_LOW) ? 1 : 0; |
124 | args.count = 1; | |
125 | args.u[0].p = &slew; | |
4350147a | 126 | |
9a699aef | 127 | pmf_call_one(pfunc_set_vdnap0, &args); |
4350147a | 128 | |
9a699aef BH |
129 | /* It's an irq GPIO so we should be able to just block here, |
130 | * I'll do that later after I've properly tested the IRQ code for | |
131 | * platform functions | |
132 | */ | |
133 | timeout = jiffies + HZ/10; | |
134 | while(!time_after(jiffies, timeout)) { | |
135 | args.count = 1; | |
136 | args.u[0].p = &done; | |
137 | pmf_call_one(pfunc_vdnap0_complete, &args); | |
138 | if (done) | |
139 | break; | |
45a428eb | 140 | usleep_range(1000, 1000); |
9a699aef BH |
141 | } |
142 | if (done == 0) | |
1c5864e2 | 143 | pr_warn("Timeout in clock slewing !\n"); |
9a699aef | 144 | } |
4350147a | 145 | |
9a699aef BH |
146 | |
147 | /* | |
148 | * SCOM based frequency switching for 970FX rev3 | |
149 | */ | |
150 | static int g5_scom_switch_freq(int speed_mode) | |
151 | { | |
152 | unsigned long flags; | |
153 | int to; | |
4350147a BH |
154 | |
155 | /* If frequency is going up, first ramp up the voltage */ | |
156 | if (speed_mode < g5_pmode_cur) | |
157 | g5_switch_volt(speed_mode); | |
158 | ||
9a699aef BH |
159 | local_irq_save(flags); |
160 | ||
4350147a BH |
161 | /* Clear PCR high */ |
162 | scom970_write(SCOM_PCR, 0); | |
163 | /* Clear PCR low */ | |
164 | scom970_write(SCOM_PCR, PCR_HILO_SELECT | 0); | |
165 | /* Set PCR low */ | |
166 | scom970_write(SCOM_PCR, PCR_HILO_SELECT | | |
167 | g5_pmode_data[speed_mode]); | |
168 | ||
169 | /* Wait for completion */ | |
170 | for (to = 0; to < 10; to++) { | |
171 | unsigned long psr = scom970_read(SCOM_PSR); | |
172 | ||
173 | if ((psr & PSR_CMD_RECEIVED) == 0 && | |
174 | (((psr >> PSR_CUR_SPEED_SHIFT) ^ | |
175 | (g5_pmode_data[speed_mode] >> PCR_SPEED_SHIFT)) & 0x3) | |
176 | == 0) | |
177 | break; | |
178 | if (psr & PSR_CMD_COMPLETED) | |
179 | break; | |
180 | udelay(100); | |
181 | } | |
182 | ||
9a699aef BH |
183 | local_irq_restore(flags); |
184 | ||
4350147a BH |
185 | /* If frequency is going down, last ramp the voltage */ |
186 | if (speed_mode > g5_pmode_cur) | |
187 | g5_switch_volt(speed_mode); | |
188 | ||
189 | g5_pmode_cur = speed_mode; | |
190 | ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul; | |
191 | ||
4350147a BH |
192 | return 0; |
193 | } | |
194 | ||
9a699aef | 195 | static int g5_scom_query_freq(void) |
4350147a BH |
196 | { |
197 | unsigned long psr = scom970_read(SCOM_PSR); | |
198 | int i; | |
199 | ||
200 | for (i = 0; i <= g5_pmode_max; i++) | |
201 | if ((((psr >> PSR_CUR_SPEED_SHIFT) ^ | |
202 | (g5_pmode_data[i] >> PCR_SPEED_SHIFT)) & 0x3) == 0) | |
203 | break; | |
204 | return i; | |
205 | } | |
206 | ||
7ed14c21 BH |
207 | /* |
208 | * Fake voltage switching for platforms with missing support | |
209 | */ | |
210 | ||
211 | static void g5_dummy_switch_volt(int speed_mode) | |
212 | { | |
213 | } | |
214 | ||
e272a285 | 215 | #endif /* CONFIG_PMAC_SMU */ |
7ed14c21 | 216 | |
9a699aef BH |
217 | /* |
218 | * Platform function based voltage switching for PowerMac7,2 & 7,3 | |
219 | */ | |
220 | ||
221 | static struct pmf_function *pfunc_cpu0_volt_high; | |
222 | static struct pmf_function *pfunc_cpu0_volt_low; | |
223 | static struct pmf_function *pfunc_cpu1_volt_high; | |
224 | static struct pmf_function *pfunc_cpu1_volt_low; | |
225 | ||
226 | static void g5_pfunc_switch_volt(int speed_mode) | |
227 | { | |
228 | if (speed_mode == CPUFREQ_HIGH) { | |
229 | if (pfunc_cpu0_volt_high) | |
230 | pmf_call_one(pfunc_cpu0_volt_high, NULL); | |
231 | if (pfunc_cpu1_volt_high) | |
232 | pmf_call_one(pfunc_cpu1_volt_high, NULL); | |
233 | } else { | |
234 | if (pfunc_cpu0_volt_low) | |
235 | pmf_call_one(pfunc_cpu0_volt_low, NULL); | |
236 | if (pfunc_cpu1_volt_low) | |
237 | pmf_call_one(pfunc_cpu1_volt_low, NULL); | |
238 | } | |
45a428eb | 239 | usleep_range(10000, 10000); /* should be faster , to fix */ |
9a699aef BH |
240 | } |
241 | ||
242 | /* | |
243 | * Platform function based frequency switching for PowerMac7,2 & 7,3 | |
244 | */ | |
245 | ||
246 | static struct pmf_function *pfunc_cpu_setfreq_high; | |
247 | static struct pmf_function *pfunc_cpu_setfreq_low; | |
248 | static struct pmf_function *pfunc_cpu_getfreq; | |
d258e64e | 249 | static struct pmf_function *pfunc_slewing_done; |
9a699aef BH |
250 | |
251 | static int g5_pfunc_switch_freq(int speed_mode) | |
252 | { | |
253 | struct pmf_args args; | |
254 | u32 done = 0; | |
255 | unsigned long timeout; | |
7ed14c21 BH |
256 | int rc; |
257 | ||
258 | DBG("g5_pfunc_switch_freq(%d)\n", speed_mode); | |
9a699aef BH |
259 | |
260 | /* If frequency is going up, first ramp up the voltage */ | |
261 | if (speed_mode < g5_pmode_cur) | |
262 | g5_switch_volt(speed_mode); | |
263 | ||
264 | /* Do it */ | |
265 | if (speed_mode == CPUFREQ_HIGH) | |
7ed14c21 | 266 | rc = pmf_call_one(pfunc_cpu_setfreq_high, NULL); |
9a699aef | 267 | else |
7ed14c21 BH |
268 | rc = pmf_call_one(pfunc_cpu_setfreq_low, NULL); |
269 | ||
270 | if (rc) | |
1c5864e2 | 271 | pr_warn("pfunc switch error %d\n", rc); |
9a699aef BH |
272 | |
273 | /* It's an irq GPIO so we should be able to just block here, | |
274 | * I'll do that later after I've properly tested the IRQ code for | |
275 | * platform functions | |
276 | */ | |
277 | timeout = jiffies + HZ/10; | |
278 | while(!time_after(jiffies, timeout)) { | |
279 | args.count = 1; | |
280 | args.u[0].p = &done; | |
281 | pmf_call_one(pfunc_slewing_done, &args); | |
282 | if (done) | |
283 | break; | |
45a428eb | 284 | usleep_range(500, 500); |
9a699aef BH |
285 | } |
286 | if (done == 0) | |
1c5864e2 | 287 | pr_warn("Timeout in clock slewing !\n"); |
9a699aef BH |
288 | |
289 | /* If frequency is going down, last ramp the voltage */ | |
290 | if (speed_mode > g5_pmode_cur) | |
291 | g5_switch_volt(speed_mode); | |
292 | ||
293 | g5_pmode_cur = speed_mode; | |
294 | ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul; | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | static int g5_pfunc_query_freq(void) | |
300 | { | |
301 | struct pmf_args args; | |
302 | u32 val = 0; | |
303 | ||
304 | args.count = 1; | |
305 | args.u[0].p = &val; | |
306 | pmf_call_one(pfunc_cpu_getfreq, &args); | |
307 | return val ? CPUFREQ_HIGH : CPUFREQ_LOW; | |
308 | } | |
309 | ||
9a699aef BH |
310 | |
311 | /* | |
312 | * Common interface to the cpufreq core | |
313 | */ | |
4350147a | 314 | |
9c0ebcf7 | 315 | static int g5_cpufreq_target(struct cpufreq_policy *policy, unsigned int index) |
4350147a | 316 | { |
d4019f0a | 317 | return g5_switch_freq(index); |
4350147a BH |
318 | } |
319 | ||
320 | static unsigned int g5_cpufreq_get_speed(unsigned int cpu) | |
321 | { | |
322 | return g5_cpu_freqs[g5_pmode_cur].frequency; | |
323 | } | |
324 | ||
325 | static int g5_cpufreq_cpu_init(struct cpufreq_policy *policy) | |
326 | { | |
8ce6f9de | 327 | return cpufreq_generic_init(policy, g5_cpu_freqs, transition_latency); |
4350147a BH |
328 | } |
329 | ||
4350147a BH |
330 | static struct cpufreq_driver g5_cpufreq_driver = { |
331 | .name = "powermac", | |
4350147a BH |
332 | .flags = CPUFREQ_CONST_LOOPS, |
333 | .init = g5_cpufreq_cpu_init, | |
2633a46c | 334 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 335 | .target_index = g5_cpufreq_target, |
4350147a | 336 | .get = g5_cpufreq_get_speed, |
2633a46c | 337 | .attr = cpufreq_generic_attr, |
4350147a BH |
338 | }; |
339 | ||
340 | ||
e272a285 | 341 | #ifdef CONFIG_PMAC_SMU |
7ed14c21 | 342 | |
760287ab | 343 | static int __init g5_neo2_cpufreq_init(struct device_node *cpunode) |
4350147a | 344 | { |
4350147a | 345 | unsigned int psize, ssize; |
4350147a | 346 | unsigned long max_freq; |
9a699aef | 347 | char *freq_method, *volt_method; |
018a3d1d JK |
348 | const u32 *valp; |
349 | u32 pvr_hi; | |
9a699aef BH |
350 | int use_volts_vdnap = 0; |
351 | int use_volts_smu = 0; | |
4350147a BH |
352 | int rc = -ENODEV; |
353 | ||
9a699aef | 354 | /* Check supported platforms */ |
71a157e8 GL |
355 | if (of_machine_is_compatible("PowerMac8,1") || |
356 | of_machine_is_compatible("PowerMac8,2") || | |
89108362 AK |
357 | of_machine_is_compatible("PowerMac9,1") || |
358 | of_machine_is_compatible("PowerMac12,1")) | |
9a699aef | 359 | use_volts_smu = 1; |
71a157e8 | 360 | else if (of_machine_is_compatible("PowerMac11,2")) |
9a699aef BH |
361 | use_volts_vdnap = 1; |
362 | else | |
363 | return -ENODEV; | |
364 | ||
4350147a | 365 | /* Check 970FX for now */ |
e2eb6392 | 366 | valp = of_get_property(cpunode, "cpu-version", NULL); |
4350147a BH |
367 | if (!valp) { |
368 | DBG("No cpu-version property !\n"); | |
369 | goto bail_noprops; | |
370 | } | |
9a699aef BH |
371 | pvr_hi = (*valp) >> 16; |
372 | if (pvr_hi != 0x3c && pvr_hi != 0x44) { | |
1c5864e2 | 373 | pr_err("Unsupported CPU version\n"); |
4350147a BH |
374 | goto bail_noprops; |
375 | } | |
376 | ||
377 | /* Look for the powertune data in the device-tree */ | |
e2eb6392 | 378 | g5_pmode_data = of_get_property(cpunode, "power-mode-data",&psize); |
4350147a BH |
379 | if (!g5_pmode_data) { |
380 | DBG("No power-mode-data !\n"); | |
381 | goto bail_noprops; | |
382 | } | |
383 | g5_pmode_max = psize / sizeof(u32) - 1; | |
384 | ||
9a699aef | 385 | if (use_volts_smu) { |
018a3d1d | 386 | const struct smu_sdbp_header *shdr; |
9a699aef BH |
387 | |
388 | /* Look for the FVT table */ | |
389 | shdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); | |
390 | if (!shdr) | |
391 | goto bail_noprops; | |
392 | g5_fvt_table = (struct smu_sdbp_fvt *)&shdr[1]; | |
d5b73cd8 VK |
393 | ssize = (shdr->len * sizeof(u32)) - sizeof(*shdr); |
394 | g5_fvt_count = ssize / sizeof(*g5_fvt_table); | |
9a699aef BH |
395 | g5_fvt_cur = 0; |
396 | ||
397 | /* Sanity checking */ | |
398 | if (g5_fvt_count < 1 || g5_pmode_max < 1) | |
399 | goto bail_noprops; | |
400 | ||
401 | g5_switch_volt = g5_smu_switch_volt; | |
402 | volt_method = "SMU"; | |
403 | } else if (use_volts_vdnap) { | |
404 | struct device_node *root; | |
405 | ||
406 | root = of_find_node_by_path("/"); | |
407 | if (root == NULL) { | |
1c5864e2 | 408 | pr_err("Can't find root of device tree\n"); |
9a699aef BH |
409 | goto bail_noprops; |
410 | } | |
411 | pfunc_set_vdnap0 = pmf_find_function(root, "set-vdnap0"); | |
412 | pfunc_vdnap0_complete = | |
413 | pmf_find_function(root, "slewing-done"); | |
0dc0eb78 | 414 | of_node_put(root); |
9a699aef BH |
415 | if (pfunc_set_vdnap0 == NULL || |
416 | pfunc_vdnap0_complete == NULL) { | |
1c5864e2 | 417 | pr_err("Can't find required platform function\n"); |
9a699aef BH |
418 | goto bail_noprops; |
419 | } | |
420 | ||
421 | g5_switch_volt = g5_vdnap_switch_volt; | |
422 | volt_method = "GPIO"; | |
423 | } else { | |
424 | g5_switch_volt = g5_dummy_switch_volt; | |
425 | volt_method = "none"; | |
426 | } | |
4350147a BH |
427 | |
428 | /* | |
429 | * From what I see, clock-frequency is always the maximal frequency. | |
430 | * The current driver can not slew sysclk yet, so we really only deal | |
431 | * with powertune steps for now. We also only implement full freq and | |
432 | * half freq in this version. So far, I haven't yet seen a machine | |
433 | * supporting anything else. | |
434 | */ | |
e2eb6392 | 435 | valp = of_get_property(cpunode, "clock-frequency", NULL); |
4350147a BH |
436 | if (!valp) |
437 | return -ENODEV; | |
438 | max_freq = (*valp)/1000; | |
439 | g5_cpu_freqs[0].frequency = max_freq; | |
440 | g5_cpu_freqs[1].frequency = max_freq/2; | |
441 | ||
9a699aef | 442 | /* Set callbacks */ |
16962e7c | 443 | transition_latency = 12000; |
9a699aef BH |
444 | g5_switch_freq = g5_scom_switch_freq; |
445 | g5_query_freq = g5_scom_query_freq; | |
446 | freq_method = "SCOM"; | |
4350147a BH |
447 | |
448 | /* Force apply current frequency to make sure everything is in | |
449 | * sync (voltage is right for example). Firmware may leave us with | |
450 | * a strange setting ... | |
451 | */ | |
9a699aef BH |
452 | g5_switch_volt(CPUFREQ_HIGH); |
453 | msleep(10); | |
454 | g5_pmode_cur = -1; | |
455 | g5_switch_freq(g5_query_freq()); | |
4350147a | 456 | |
b49c22a6 JP |
457 | pr_info("Registering G5 CPU frequency driver\n"); |
458 | pr_info("Frequency method: %s, Voltage method: %s\n", | |
459 | freq_method, volt_method); | |
460 | pr_info("Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n", | |
4350147a BH |
461 | g5_cpu_freqs[1].frequency/1000, |
462 | g5_cpu_freqs[0].frequency/1000, | |
463 | g5_cpu_freqs[g5_pmode_cur].frequency/1000); | |
464 | ||
465 | rc = cpufreq_register_driver(&g5_cpufreq_driver); | |
466 | ||
467 | /* We keep the CPU node on hold... hopefully, Apple G5 don't have | |
468 | * hotplug CPU with a dynamic device-tree ... | |
469 | */ | |
470 | return rc; | |
471 | ||
472 | bail_noprops: | |
473 | of_node_put(cpunode); | |
474 | ||
475 | return rc; | |
476 | } | |
477 | ||
e272a285 | 478 | #endif /* CONFIG_PMAC_SMU */ |
7ed14c21 BH |
479 | |
480 | ||
760287ab | 481 | static int __init g5_pm72_cpufreq_init(struct device_node *cpunode) |
9a699aef | 482 | { |
760287ab | 483 | struct device_node *cpuid = NULL, *hwclock = NULL; |
018a3d1d JK |
484 | const u8 *eeprom = NULL; |
485 | const u32 *valp; | |
9a699aef BH |
486 | u64 max_freq, min_freq, ih, il; |
487 | int has_volt = 1, rc = 0; | |
488 | ||
7ed14c21 BH |
489 | DBG("cpufreq: Initializing for PowerMac7,2, PowerMac7,3 and" |
490 | " RackMac3,1...\n"); | |
491 | ||
9a699aef BH |
492 | /* Lookup the cpuid eeprom node */ |
493 | cpuid = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/cpuid@a0"); | |
494 | if (cpuid != NULL) | |
e2eb6392 | 495 | eeprom = of_get_property(cpuid, "cpuid", NULL); |
9a699aef | 496 | if (eeprom == NULL) { |
1c5864e2 | 497 | pr_err("Can't find cpuid EEPROM !\n"); |
9a699aef BH |
498 | rc = -ENODEV; |
499 | goto bail; | |
500 | } | |
501 | ||
502 | /* Lookup the i2c hwclock */ | |
ccdb8ed3 | 503 | for_each_node_by_name(hwclock, "i2c-hwclock") { |
e2eb6392 | 504 | const char *loc = of_get_property(hwclock, |
018a3d1d | 505 | "hwctrl-location", NULL); |
9a699aef BH |
506 | if (loc == NULL) |
507 | continue; | |
508 | if (strcmp(loc, "CPU CLOCK")) | |
509 | continue; | |
e2eb6392 | 510 | if (!of_get_property(hwclock, "platform-get-frequency", NULL)) |
9a699aef BH |
511 | continue; |
512 | break; | |
513 | } | |
514 | if (hwclock == NULL) { | |
1c5864e2 | 515 | pr_err("Can't find i2c clock chip !\n"); |
9a699aef BH |
516 | rc = -ENODEV; |
517 | goto bail; | |
518 | } | |
519 | ||
cc5a7a74 | 520 | DBG("cpufreq: i2c clock chip found: %pOF\n", hwclock); |
9a699aef BH |
521 | |
522 | /* Now get all the platform functions */ | |
523 | pfunc_cpu_getfreq = | |
524 | pmf_find_function(hwclock, "get-frequency"); | |
525 | pfunc_cpu_setfreq_high = | |
526 | pmf_find_function(hwclock, "set-frequency-high"); | |
527 | pfunc_cpu_setfreq_low = | |
528 | pmf_find_function(hwclock, "set-frequency-low"); | |
529 | pfunc_slewing_done = | |
530 | pmf_find_function(hwclock, "slewing-done"); | |
531 | pfunc_cpu0_volt_high = | |
532 | pmf_find_function(hwclock, "set-voltage-high-0"); | |
533 | pfunc_cpu0_volt_low = | |
534 | pmf_find_function(hwclock, "set-voltage-low-0"); | |
535 | pfunc_cpu1_volt_high = | |
536 | pmf_find_function(hwclock, "set-voltage-high-1"); | |
537 | pfunc_cpu1_volt_low = | |
538 | pmf_find_function(hwclock, "set-voltage-low-1"); | |
539 | ||
540 | /* Check we have minimum requirements */ | |
541 | if (pfunc_cpu_getfreq == NULL || pfunc_cpu_setfreq_high == NULL || | |
542 | pfunc_cpu_setfreq_low == NULL || pfunc_slewing_done == NULL) { | |
1c5864e2 | 543 | pr_err("Can't find platform functions !\n"); |
9a699aef BH |
544 | rc = -ENODEV; |
545 | goto bail; | |
546 | } | |
547 | ||
548 | /* Check that we have complete sets */ | |
549 | if (pfunc_cpu0_volt_high == NULL || pfunc_cpu0_volt_low == NULL) { | |
550 | pmf_put_function(pfunc_cpu0_volt_high); | |
551 | pmf_put_function(pfunc_cpu0_volt_low); | |
552 | pfunc_cpu0_volt_high = pfunc_cpu0_volt_low = NULL; | |
553 | has_volt = 0; | |
554 | } | |
555 | if (!has_volt || | |
556 | pfunc_cpu1_volt_high == NULL || pfunc_cpu1_volt_low == NULL) { | |
557 | pmf_put_function(pfunc_cpu1_volt_high); | |
558 | pmf_put_function(pfunc_cpu1_volt_low); | |
559 | pfunc_cpu1_volt_high = pfunc_cpu1_volt_low = NULL; | |
560 | } | |
561 | ||
562 | /* Note: The device tree also contains a "platform-set-values" | |
563 | * function for which I haven't quite figured out the usage. It | |
564 | * might have to be called on init and/or wakeup, I'm not too sure | |
565 | * but things seem to work fine without it so far ... | |
566 | */ | |
567 | ||
568 | /* Get max frequency from device-tree */ | |
e2eb6392 | 569 | valp = of_get_property(cpunode, "clock-frequency", NULL); |
9a699aef | 570 | if (!valp) { |
1c5864e2 | 571 | pr_err("Can't find CPU frequency !\n"); |
9a699aef BH |
572 | rc = -ENODEV; |
573 | goto bail; | |
574 | } | |
575 | ||
576 | max_freq = (*valp)/1000; | |
577 | ||
578 | /* Now calculate reduced frequency by using the cpuid input freq | |
579 | * ratio. This requires 64 bits math unless we are willing to lose | |
580 | * some precision | |
581 | */ | |
582 | ih = *((u32 *)(eeprom + 0x10)); | |
583 | il = *((u32 *)(eeprom + 0x20)); | |
7ed14c21 BH |
584 | |
585 | /* Check for machines with no useful settings */ | |
586 | if (il == ih) { | |
1c5864e2 | 587 | pr_warn("No low frequency mode available on this model !\n"); |
7ed14c21 BH |
588 | rc = -ENODEV; |
589 | goto bail; | |
590 | } | |
591 | ||
9a699aef BH |
592 | min_freq = 0; |
593 | if (ih != 0 && il != 0) | |
594 | min_freq = (max_freq * il) / ih; | |
595 | ||
596 | /* Sanity check */ | |
597 | if (min_freq >= max_freq || min_freq < 1000) { | |
1c5864e2 | 598 | pr_err("Can't calculate low frequency !\n"); |
7ed14c21 | 599 | rc = -ENXIO; |
9a699aef BH |
600 | goto bail; |
601 | } | |
602 | g5_cpu_freqs[0].frequency = max_freq; | |
603 | g5_cpu_freqs[1].frequency = min_freq; | |
604 | ||
af671d8b AK |
605 | /* Based on a measurement on Xserve G5, rounded up. */ |
606 | transition_latency = 10 * NSEC_PER_MSEC; | |
607 | ||
9a699aef BH |
608 | /* Set callbacks */ |
609 | g5_switch_volt = g5_pfunc_switch_volt; | |
610 | g5_switch_freq = g5_pfunc_switch_freq; | |
611 | g5_query_freq = g5_pfunc_query_freq; | |
612 | ||
613 | /* Force apply current frequency to make sure everything is in | |
614 | * sync (voltage is right for example). Firmware may leave us with | |
615 | * a strange setting ... | |
616 | */ | |
617 | g5_switch_volt(CPUFREQ_HIGH); | |
618 | msleep(10); | |
619 | g5_pmode_cur = -1; | |
620 | g5_switch_freq(g5_query_freq()); | |
621 | ||
b49c22a6 JP |
622 | pr_info("Registering G5 CPU frequency driver\n"); |
623 | pr_info("Frequency method: i2c/pfunc, Voltage method: %s\n", | |
624 | has_volt ? "i2c/pfunc" : "none"); | |
625 | pr_info("Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n", | |
9a699aef BH |
626 | g5_cpu_freqs[1].frequency/1000, |
627 | g5_cpu_freqs[0].frequency/1000, | |
628 | g5_cpu_freqs[g5_pmode_cur].frequency/1000); | |
629 | ||
630 | rc = cpufreq_register_driver(&g5_cpufreq_driver); | |
631 | bail: | |
632 | if (rc != 0) { | |
633 | pmf_put_function(pfunc_cpu_getfreq); | |
634 | pmf_put_function(pfunc_cpu_setfreq_high); | |
635 | pmf_put_function(pfunc_cpu_setfreq_low); | |
636 | pmf_put_function(pfunc_slewing_done); | |
637 | pmf_put_function(pfunc_cpu0_volt_high); | |
638 | pmf_put_function(pfunc_cpu0_volt_low); | |
639 | pmf_put_function(pfunc_cpu1_volt_high); | |
640 | pmf_put_function(pfunc_cpu1_volt_low); | |
641 | } | |
642 | of_node_put(hwclock); | |
643 | of_node_put(cpuid); | |
644 | of_node_put(cpunode); | |
645 | ||
646 | return rc; | |
647 | } | |
648 | ||
9a699aef BH |
649 | static int __init g5_cpufreq_init(void) |
650 | { | |
760287ab | 651 | struct device_node *cpunode; |
7ed14c21 | 652 | int rc = 0; |
9a699aef | 653 | |
760287ab SK |
654 | /* Get first CPU node */ |
655 | cpunode = of_cpu_device_node_get(0); | |
656 | if (cpunode == NULL) { | |
1c5864e2 | 657 | pr_err("Can't find any CPU node\n"); |
9a699aef BH |
658 | return -ENODEV; |
659 | } | |
660 | ||
71a157e8 GL |
661 | if (of_machine_is_compatible("PowerMac7,2") || |
662 | of_machine_is_compatible("PowerMac7,3") || | |
663 | of_machine_is_compatible("RackMac3,1")) | |
760287ab | 664 | rc = g5_pm72_cpufreq_init(cpunode); |
e272a285 | 665 | #ifdef CONFIG_PMAC_SMU |
9a699aef | 666 | else |
760287ab | 667 | rc = g5_neo2_cpufreq_init(cpunode); |
e272a285 | 668 | #endif /* CONFIG_PMAC_SMU */ |
9a699aef | 669 | |
9a699aef BH |
670 | return rc; |
671 | } | |
672 | ||
4350147a BH |
673 | module_init(g5_cpufreq_init); |
674 | ||
675 | ||
676 | MODULE_LICENSE("GPL"); |