diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-07 15:52:38 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-07 15:52:38 -0500 |
commit | 08b8499bdd26822df16f962db88215d02e40850a (patch) | |
tree | 3a88a0f1a425637d0f5a8e68ec3419fc5f1bdb9b /arch/x86 | |
parent | 3ceb85ae35421c5bc560c7af8d0dd1c73d071ad0 (diff) | |
parent | fb4635932a4e19c2f55383f968a0e9b64da37354 (diff) |
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
[CPUFREQ] Fix cast warning in pcc driver.
[CPUFREQ] Processor Clocking Control interface driver
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/kernel/cpu/cpufreq/Kconfig | 14 | ||||
-rw-r--r-- | arch/x86/kernel/cpu/cpufreq/Makefile | 1 | ||||
-rw-r--r-- | arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c | 620 |
3 files changed, 635 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/Kconfig b/arch/x86/kernel/cpu/cpufreq/Kconfig index f138c6c389b9..870e6cc6ad28 100644 --- a/arch/x86/kernel/cpu/cpufreq/Kconfig +++ b/arch/x86/kernel/cpu/cpufreq/Kconfig | |||
@@ -10,6 +10,20 @@ if CPU_FREQ | |||
10 | 10 | ||
11 | comment "CPUFreq processor drivers" | 11 | comment "CPUFreq processor drivers" |
12 | 12 | ||
13 | config X86_PCC_CPUFREQ | ||
14 | tristate "Processor Clocking Control interface driver" | ||
15 | depends on ACPI && ACPI_PROCESSOR | ||
16 | help | ||
17 | This driver adds support for the PCC interface. | ||
18 | |||
19 | For details, take a look at: | ||
20 | <file:Documentation/cpu-freq/pcc-cpufreq.txt>. | ||
21 | |||
22 | To compile this driver as a module, choose M here: the | ||
23 | module will be called pcc-cpufreq. | ||
24 | |||
25 | If in doubt, say N. | ||
26 | |||
13 | config X86_ACPI_CPUFREQ | 27 | config X86_ACPI_CPUFREQ |
14 | tristate "ACPI Processor P-States driver" | 28 | tristate "ACPI Processor P-States driver" |
15 | select CPU_FREQ_TABLE | 29 | select CPU_FREQ_TABLE |
diff --git a/arch/x86/kernel/cpu/cpufreq/Makefile b/arch/x86/kernel/cpu/cpufreq/Makefile index 509296df294d..1840c0a5170b 100644 --- a/arch/x86/kernel/cpu/cpufreq/Makefile +++ b/arch/x86/kernel/cpu/cpufreq/Makefile | |||
@@ -4,6 +4,7 @@ | |||
4 | 4 | ||
5 | obj-$(CONFIG_X86_POWERNOW_K8) += powernow-k8.o | 5 | obj-$(CONFIG_X86_POWERNOW_K8) += powernow-k8.o |
6 | obj-$(CONFIG_X86_ACPI_CPUFREQ) += acpi-cpufreq.o | 6 | obj-$(CONFIG_X86_ACPI_CPUFREQ) += acpi-cpufreq.o |
7 | obj-$(CONFIG_X86_PCC_CPUFREQ) += pcc-cpufreq.o | ||
7 | obj-$(CONFIG_X86_POWERNOW_K6) += powernow-k6.o | 8 | obj-$(CONFIG_X86_POWERNOW_K6) += powernow-k6.o |
8 | obj-$(CONFIG_X86_POWERNOW_K7) += powernow-k7.o | 9 | obj-$(CONFIG_X86_POWERNOW_K7) += powernow-k7.o |
9 | obj-$(CONFIG_X86_LONGHAUL) += longhaul.o | 10 | obj-$(CONFIG_X86_LONGHAUL) += longhaul.o |
diff --git a/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c new file mode 100644 index 000000000000..ff36d2979a90 --- /dev/null +++ b/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c | |||
@@ -0,0 +1,620 @@ | |||
1 | /* | ||
2 | * pcc-cpufreq.c - Processor Clocking Control firmware cpufreq interface | ||
3 | * | ||
4 | * Copyright (C) 2009 Red Hat, Matthew Garrett <mjg@redhat.com> | ||
5 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. | ||
6 | * Nagananda Chumbalkar <nagananda.chumbalkar@hp.com> | ||
7 | * | ||
8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
9 | * | ||
10 | * This program is free software; you can redistribute it and/or modify | ||
11 | * it under the terms of the GNU General Public License as published by | ||
12 | * the Free Software Foundation; version 2 of the License. | ||
13 | * | ||
14 | * This program is distributed in the hope that it will be useful, but | ||
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | ||
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or NON | ||
17 | * INFRINGEMENT. See the GNU General Public License for more details. | ||
18 | * | ||
19 | * You should have received a copy of the GNU General Public License along | ||
20 | * with this program; if not, write to the Free Software Foundation, Inc., | ||
21 | * 675 Mass Ave, Cambridge, MA 02139, USA. | ||
22 | * | ||
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
24 | */ | ||
25 | |||
26 | #include <linux/kernel.h> | ||
27 | #include <linux/module.h> | ||
28 | #include <linux/init.h> | ||
29 | #include <linux/smp.h> | ||
30 | #include <linux/sched.h> | ||
31 | #include <linux/cpufreq.h> | ||
32 | #include <linux/compiler.h> | ||
33 | |||
34 | #include <linux/acpi.h> | ||
35 | #include <linux/io.h> | ||
36 | #include <linux/spinlock.h> | ||
37 | #include <linux/uaccess.h> | ||
38 | |||
39 | #include <acpi/processor.h> | ||
40 | |||
41 | #define PCC_VERSION "1.00.00" | ||
42 | #define POLL_LOOPS 300 | ||
43 | |||
44 | #define CMD_COMPLETE 0x1 | ||
45 | #define CMD_GET_FREQ 0x0 | ||
46 | #define CMD_SET_FREQ 0x1 | ||
47 | |||
48 | #define BUF_SZ 4 | ||
49 | |||
50 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \ | ||
51 | "pcc-cpufreq", msg) | ||
52 | |||
53 | struct pcc_register_resource { | ||
54 | u8 descriptor; | ||
55 | u16 length; | ||
56 | u8 space_id; | ||
57 | u8 bit_width; | ||
58 | u8 bit_offset; | ||
59 | u8 access_size; | ||
60 | u64 address; | ||
61 | } __attribute__ ((packed)); | ||
62 | |||
63 | struct pcc_memory_resource { | ||
64 | u8 descriptor; | ||
65 | u16 length; | ||
66 | u8 space_id; | ||
67 | u8 resource_usage; | ||
68 | u8 type_specific; | ||
69 | u64 granularity; | ||
70 | u64 minimum; | ||
71 | u64 maximum; | ||
72 | u64 translation_offset; | ||
73 | u64 address_length; | ||
74 | } __attribute__ ((packed)); | ||
75 | |||
76 | static struct cpufreq_driver pcc_cpufreq_driver; | ||
77 | |||
78 | struct pcc_header { | ||
79 | u32 signature; | ||
80 | u16 length; | ||
81 | u8 major; | ||
82 | u8 minor; | ||
83 | u32 features; | ||
84 | u16 command; | ||
85 | u16 status; | ||
86 | u32 latency; | ||
87 | u32 minimum_time; | ||
88 | u32 maximum_time; | ||
89 | u32 nominal; | ||
90 | u32 throttled_frequency; | ||
91 | u32 minimum_frequency; | ||
92 | }; | ||
93 | |||
94 | static void __iomem *pcch_virt_addr; | ||
95 | static struct pcc_header __iomem *pcch_hdr; | ||
96 | |||
97 | static DEFINE_SPINLOCK(pcc_lock); | ||
98 | |||
99 | static struct acpi_generic_address doorbell; | ||
100 | |||
101 | static u64 doorbell_preserve; | ||
102 | static u64 doorbell_write; | ||
103 | |||
104 | static u8 OSC_UUID[16] = {0x63, 0x9B, 0x2C, 0x9F, 0x70, 0x91, 0x49, 0x1f, | ||
105 | 0xBB, 0x4F, 0xA5, 0x98, 0x2F, 0xA1, 0xB5, 0x46}; | ||
106 | |||
107 | struct pcc_cpu { | ||
108 | u32 input_offset; | ||
109 | u32 output_offset; | ||
110 | }; | ||
111 | |||
112 | static struct pcc_cpu *pcc_cpu_info; | ||
113 | |||
114 | static int pcc_cpufreq_verify(struct cpufreq_policy *policy) | ||
115 | { | ||
116 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, | ||
117 | policy->cpuinfo.max_freq); | ||
118 | return 0; | ||
119 | } | ||
120 | |||
121 | static inline void pcc_cmd(void) | ||
122 | { | ||
123 | u64 doorbell_value; | ||
124 | int i; | ||
125 | |||
126 | acpi_read(&doorbell_value, &doorbell); | ||
127 | acpi_write((doorbell_value & doorbell_preserve) | doorbell_write, | ||
128 | &doorbell); | ||
129 | |||
130 | for (i = 0; i < POLL_LOOPS; i++) { | ||
131 | if (ioread16(&pcch_hdr->status) & CMD_COMPLETE) | ||
132 | break; | ||
133 | } | ||
134 | } | ||
135 | |||
136 | static inline void pcc_clear_mapping(void) | ||
137 | { | ||
138 | if (pcch_virt_addr) | ||
139 | iounmap(pcch_virt_addr); | ||
140 | pcch_virt_addr = NULL; | ||
141 | } | ||
142 | |||
143 | static unsigned int pcc_get_freq(unsigned int cpu) | ||
144 | { | ||
145 | struct pcc_cpu *pcc_cpu_data; | ||
146 | unsigned int curr_freq; | ||
147 | unsigned int freq_limit; | ||
148 | u16 status; | ||
149 | u32 input_buffer; | ||
150 | u32 output_buffer; | ||
151 | |||
152 | spin_lock(&pcc_lock); | ||
153 | |||
154 | dprintk("get: get_freq for CPU %d\n", cpu); | ||
155 | pcc_cpu_data = per_cpu_ptr(pcc_cpu_info, cpu); | ||
156 | |||
157 | input_buffer = 0x1; | ||
158 | iowrite32(input_buffer, | ||
159 | (pcch_virt_addr + pcc_cpu_data->input_offset)); | ||
160 | iowrite16(CMD_GET_FREQ, &pcch_hdr->command); | ||
161 | |||
162 | pcc_cmd(); | ||
163 | |||
164 | output_buffer = | ||
165 | ioread32(pcch_virt_addr + pcc_cpu_data->output_offset); | ||
166 | |||
167 | /* Clear the input buffer - we are done with the current command */ | ||
168 | memset_io((pcch_virt_addr + pcc_cpu_data->input_offset), 0, BUF_SZ); | ||
169 | |||
170 | status = ioread16(&pcch_hdr->status); | ||
171 | if (status != CMD_COMPLETE) { | ||
172 | dprintk("get: FAILED: for CPU %d, status is %d\n", | ||
173 | cpu, status); | ||
174 | goto cmd_incomplete; | ||
175 | } | ||
176 | iowrite16(0, &pcch_hdr->status); | ||
177 | curr_freq = (((ioread32(&pcch_hdr->nominal) * (output_buffer & 0xff)) | ||
178 | / 100) * 1000); | ||
179 | |||
180 | dprintk("get: SUCCESS: (virtual) output_offset for cpu %d is " | ||
181 | "0x%x, contains a value of: 0x%x. Speed is: %d MHz\n", | ||
182 | cpu, (pcch_virt_addr + pcc_cpu_data->output_offset), | ||
183 | output_buffer, curr_freq); | ||
184 | |||
185 | freq_limit = (output_buffer >> 8) & 0xff; | ||
186 | if (freq_limit != 0xff) { | ||
187 | dprintk("get: frequency for cpu %d is being temporarily" | ||
188 | " capped at %d\n", cpu, curr_freq); | ||
189 | } | ||
190 | |||
191 | spin_unlock(&pcc_lock); | ||
192 | return curr_freq; | ||
193 | |||
194 | cmd_incomplete: | ||
195 | iowrite16(0, &pcch_hdr->status); | ||
196 | spin_unlock(&pcc_lock); | ||
197 | return -EINVAL; | ||
198 | } | ||
199 | |||
200 | static int pcc_cpufreq_target(struct cpufreq_policy *policy, | ||
201 | unsigned int target_freq, | ||
202 | unsigned int relation) | ||
203 | { | ||
204 | struct pcc_cpu *pcc_cpu_data; | ||
205 | struct cpufreq_freqs freqs; | ||
206 | u16 status; | ||
207 | u32 input_buffer; | ||
208 | int cpu; | ||
209 | |||
210 | spin_lock(&pcc_lock); | ||
211 | cpu = policy->cpu; | ||
212 | pcc_cpu_data = per_cpu_ptr(pcc_cpu_info, cpu); | ||
213 | |||
214 | dprintk("target: CPU %d should go to target freq: %d " | ||
215 | "(virtual) input_offset is 0x%x\n", | ||
216 | cpu, target_freq, | ||
217 | (pcch_virt_addr + pcc_cpu_data->input_offset)); | ||
218 | |||
219 | freqs.new = target_freq; | ||
220 | freqs.cpu = cpu; | ||
221 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | ||
222 | |||
223 | input_buffer = 0x1 | (((target_freq * 100) | ||
224 | / (ioread32(&pcch_hdr->nominal) * 1000)) << 8); | ||
225 | iowrite32(input_buffer, | ||
226 | (pcch_virt_addr + pcc_cpu_data->input_offset)); | ||
227 | iowrite16(CMD_SET_FREQ, &pcch_hdr->command); | ||
228 | |||
229 | pcc_cmd(); | ||
230 | |||
231 | /* Clear the input buffer - we are done with the current command */ | ||
232 | memset_io((pcch_virt_addr + pcc_cpu_data->input_offset), 0, BUF_SZ); | ||
233 | |||
234 | status = ioread16(&pcch_hdr->status); | ||
235 | if (status != CMD_COMPLETE) { | ||
236 | dprintk("target: FAILED for cpu %d, with status: 0x%x\n", | ||
237 | cpu, status); | ||
238 | goto cmd_incomplete; | ||
239 | } | ||
240 | iowrite16(0, &pcch_hdr->status); | ||
241 | |||
242 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | ||
243 | dprintk("target: was SUCCESSFUL for cpu %d\n", cpu); | ||
244 | spin_unlock(&pcc_lock); | ||
245 | |||
246 | return 0; | ||
247 | |||
248 | cmd_incomplete: | ||
249 | iowrite16(0, &pcch_hdr->status); | ||
250 | spin_unlock(&pcc_lock); | ||
251 | return -EINVAL; | ||
252 | } | ||
253 | |||
254 | static int pcc_get_offset(int cpu) | ||
255 | { | ||
256 | acpi_status status; | ||
257 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | ||
258 | union acpi_object *pccp, *offset; | ||
259 | struct pcc_cpu *pcc_cpu_data; | ||
260 | struct acpi_processor *pr; | ||
261 | int ret = 0; | ||
262 | |||
263 | pr = per_cpu(processors, cpu); | ||
264 | pcc_cpu_data = per_cpu_ptr(pcc_cpu_info, cpu); | ||
265 | |||
266 | status = acpi_evaluate_object(pr->handle, "PCCP", NULL, &buffer); | ||
267 | if (ACPI_FAILURE(status)) | ||
268 | return -ENODEV; | ||
269 | |||
270 | pccp = buffer.pointer; | ||
271 | if (!pccp || pccp->type != ACPI_TYPE_PACKAGE) { | ||
272 | ret = -ENODEV; | ||
273 | goto out_free; | ||
274 | }; | ||
275 | |||
276 | offset = &(pccp->package.elements[0]); | ||
277 | if (!offset || offset->type != ACPI_TYPE_INTEGER) { | ||
278 | ret = -ENODEV; | ||
279 | goto out_free; | ||
280 | } | ||
281 | |||
282 | pcc_cpu_data->input_offset = offset->integer.value; | ||
283 | |||
284 | offset = &(pccp->package.elements[1]); | ||
285 | if (!offset || offset->type != ACPI_TYPE_INTEGER) { | ||
286 | ret = -ENODEV; | ||
287 | goto out_free; | ||
288 | } | ||
289 | |||
290 | pcc_cpu_data->output_offset = offset->integer.value; | ||
291 | |||
292 | memset_io((pcch_virt_addr + pcc_cpu_data->input_offset), 0, BUF_SZ); | ||
293 | memset_io((pcch_virt_addr + pcc_cpu_data->output_offset), 0, BUF_SZ); | ||
294 | |||
295 | dprintk("pcc_get_offset: for CPU %d: pcc_cpu_data " | ||
296 | "input_offset: 0x%x, pcc_cpu_data output_offset: 0x%x\n", | ||
297 | cpu, pcc_cpu_data->input_offset, pcc_cpu_data->output_offset); | ||
298 | out_free: | ||
299 | kfree(buffer.pointer); | ||
300 | return ret; | ||
301 | } | ||
302 | |||
303 | static int __init pcc_cpufreq_do_osc(acpi_handle *handle) | ||
304 | { | ||
305 | acpi_status status; | ||
306 | struct acpi_object_list input; | ||
307 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; | ||
308 | union acpi_object in_params[4]; | ||
309 | union acpi_object *out_obj; | ||
310 | u32 capabilities[2]; | ||
311 | u32 errors; | ||
312 | u32 supported; | ||
313 | int ret = 0; | ||
314 | |||
315 | input.count = 4; | ||
316 | input.pointer = in_params; | ||
317 | input.count = 4; | ||
318 | input.pointer = in_params; | ||
319 | in_params[0].type = ACPI_TYPE_BUFFER; | ||
320 | in_params[0].buffer.length = 16; | ||
321 | in_params[0].buffer.pointer = OSC_UUID; | ||
322 | in_params[1].type = ACPI_TYPE_INTEGER; | ||
323 | in_params[1].integer.value = 1; | ||
324 | in_params[2].type = ACPI_TYPE_INTEGER; | ||
325 | in_params[2].integer.value = 2; | ||
326 | in_params[3].type = ACPI_TYPE_BUFFER; | ||
327 | in_params[3].buffer.length = 8; | ||
328 | in_params[3].buffer.pointer = (u8 *)&capabilities; | ||
329 | |||
330 | capabilities[0] = OSC_QUERY_ENABLE; | ||
331 | capabilities[1] = 0x1; | ||
332 | |||
333 | status = acpi_evaluate_object(*handle, "_OSC", &input, &output); | ||
334 | if (ACPI_FAILURE(status)) | ||
335 | return -ENODEV; | ||
336 | |||
337 | if (!output.length) | ||
338 | return -ENODEV; | ||
339 | |||
340 | out_obj = output.pointer; | ||
341 | if (out_obj->type != ACPI_TYPE_BUFFER) { | ||
342 | ret = -ENODEV; | ||
343 | goto out_free; | ||
344 | } | ||
345 | |||
346 | errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); | ||
347 | if (errors) { | ||
348 | ret = -ENODEV; | ||
349 | goto out_free; | ||
350 | } | ||
351 | |||
352 | supported = *((u32 *)(out_obj->buffer.pointer + 4)); | ||
353 | if (!(supported & 0x1)) { | ||
354 | ret = -ENODEV; | ||
355 | goto out_free; | ||
356 | } | ||
357 | |||
358 | kfree(output.pointer); | ||
359 | capabilities[0] = 0x0; | ||
360 | capabilities[1] = 0x1; | ||
361 | |||
362 | status = acpi_evaluate_object(*handle, "_OSC", &input, &output); | ||
363 | if (ACPI_FAILURE(status)) | ||
364 | return -ENODEV; | ||
365 | |||
366 | if (!output.length) | ||
367 | return -ENODEV; | ||
368 | |||
369 | out_obj = output.pointer; | ||
370 | if (out_obj->type != ACPI_TYPE_BUFFER) { | ||
371 | ret = -ENODEV; | ||
372 | goto out_free; | ||
373 | } | ||
374 | |||
375 | errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); | ||
376 | if (errors) { | ||
377 | ret = -ENODEV; | ||
378 | goto out_free; | ||
379 | } | ||
380 | |||
381 | supported = *((u32 *)(out_obj->buffer.pointer + 4)); | ||
382 | if (!(supported & 0x1)) { | ||
383 | ret = -ENODEV; | ||
384 | goto out_free; | ||
385 | } | ||
386 | |||
387 | out_free: | ||
388 | kfree(output.pointer); | ||
389 | return ret; | ||
390 | } | ||
391 | |||
392 | static int __init pcc_cpufreq_probe(void) | ||
393 | { | ||
394 | acpi_status status; | ||
395 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; | ||
396 | struct pcc_memory_resource *mem_resource; | ||
397 | struct pcc_register_resource *reg_resource; | ||
398 | union acpi_object *out_obj, *member; | ||
399 | acpi_handle handle, osc_handle; | ||
400 | int ret = 0; | ||
401 | |||
402 | status = acpi_get_handle(NULL, "\\_SB", &handle); | ||
403 | if (ACPI_FAILURE(status)) | ||
404 | return -ENODEV; | ||
405 | |||
406 | status = acpi_get_handle(handle, "_OSC", &osc_handle); | ||
407 | if (ACPI_SUCCESS(status)) { | ||
408 | ret = pcc_cpufreq_do_osc(&osc_handle); | ||
409 | if (ret) | ||
410 | dprintk("probe: _OSC evaluation did not succeed\n"); | ||
411 | /* Firmware's use of _OSC is optional */ | ||
412 | ret = 0; | ||
413 | } | ||
414 | |||
415 | status = acpi_evaluate_object(handle, "PCCH", NULL, &output); | ||
416 | if (ACPI_FAILURE(status)) | ||
417 | return -ENODEV; | ||
418 | |||
419 | out_obj = output.pointer; | ||
420 | if (out_obj->type != ACPI_TYPE_PACKAGE) { | ||
421 | ret = -ENODEV; | ||
422 | goto out_free; | ||
423 | } | ||
424 | |||
425 | member = &out_obj->package.elements[0]; | ||
426 | if (member->type != ACPI_TYPE_BUFFER) { | ||
427 | ret = -ENODEV; | ||
428 | goto out_free; | ||
429 | } | ||
430 | |||
431 | mem_resource = (struct pcc_memory_resource *)member->buffer.pointer; | ||
432 | |||
433 | dprintk("probe: mem_resource descriptor: 0x%x," | ||
434 | " length: %d, space_id: %d, resource_usage: %d," | ||
435 | " type_specific: %d, granularity: 0x%llx," | ||
436 | " minimum: 0x%llx, maximum: 0x%llx," | ||
437 | " translation_offset: 0x%llx, address_length: 0x%llx\n", | ||
438 | mem_resource->descriptor, mem_resource->length, | ||
439 | mem_resource->space_id, mem_resource->resource_usage, | ||
440 | mem_resource->type_specific, mem_resource->granularity, | ||
441 | mem_resource->minimum, mem_resource->maximum, | ||
442 | mem_resource->translation_offset, | ||
443 | mem_resource->address_length); | ||
444 | |||
445 | if (mem_resource->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) { | ||
446 | ret = -ENODEV; | ||
447 | goto out_free; | ||
448 | } | ||
449 | |||
450 | pcch_virt_addr = ioremap_nocache(mem_resource->minimum, | ||
451 | mem_resource->address_length); | ||
452 | if (pcch_virt_addr == NULL) { | ||
453 | dprintk("probe: could not map shared mem region\n"); | ||
454 | goto out_free; | ||
455 | } | ||
456 | pcch_hdr = pcch_virt_addr; | ||
457 | |||
458 | dprintk("probe: PCCH header (virtual) addr: 0x%p\n", pcch_hdr); | ||
459 | dprintk("probe: PCCH header is at physical address: 0x%llx," | ||
460 | " signature: 0x%x, length: %d bytes, major: %d, minor: %d," | ||
461 | " supported features: 0x%x, command field: 0x%x," | ||
462 | " status field: 0x%x, nominal latency: %d us\n", | ||
463 | mem_resource->minimum, ioread32(&pcch_hdr->signature), | ||
464 | ioread16(&pcch_hdr->length), ioread8(&pcch_hdr->major), | ||
465 | ioread8(&pcch_hdr->minor), ioread32(&pcch_hdr->features), | ||
466 | ioread16(&pcch_hdr->command), ioread16(&pcch_hdr->status), | ||
467 | ioread32(&pcch_hdr->latency)); | ||
468 | |||
469 | dprintk("probe: min time between commands: %d us," | ||
470 | " max time between commands: %d us," | ||
471 | " nominal CPU frequency: %d MHz," | ||
472 | " minimum CPU frequency: %d MHz," | ||
473 | " minimum CPU frequency without throttling: %d MHz\n", | ||
474 | ioread32(&pcch_hdr->minimum_time), | ||
475 | ioread32(&pcch_hdr->maximum_time), | ||
476 | ioread32(&pcch_hdr->nominal), | ||
477 | ioread32(&pcch_hdr->throttled_frequency), | ||
478 | ioread32(&pcch_hdr->minimum_frequency)); | ||
479 | |||
480 | member = &out_obj->package.elements[1]; | ||
481 | if (member->type != ACPI_TYPE_BUFFER) { | ||
482 | ret = -ENODEV; | ||
483 | goto pcch_free; | ||
484 | } | ||
485 | |||
486 | reg_resource = (struct pcc_register_resource *)member->buffer.pointer; | ||
487 | |||
488 | doorbell.space_id = reg_resource->space_id; | ||
489 | doorbell.bit_width = reg_resource->bit_width; | ||
490 | doorbell.bit_offset = reg_resource->bit_offset; | ||
491 | doorbell.access_width = 64; | ||
492 | doorbell.address = reg_resource->address; | ||
493 | |||
494 | dprintk("probe: doorbell: space_id is %d, bit_width is %d, " | ||
495 | "bit_offset is %d, access_width is %d, address is 0x%llx\n", | ||
496 | doorbell.space_id, doorbell.bit_width, doorbell.bit_offset, | ||
497 | doorbell.access_width, reg_resource->address); | ||
498 | |||
499 | member = &out_obj->package.elements[2]; | ||
500 | if (member->type != ACPI_TYPE_INTEGER) { | ||
501 | ret = -ENODEV; | ||
502 | goto pcch_free; | ||
503 | } | ||
504 | |||
505 | doorbell_preserve = member->integer.value; | ||
506 | |||
507 | member = &out_obj->package.elements[3]; | ||
508 | if (member->type != ACPI_TYPE_INTEGER) { | ||
509 | ret = -ENODEV; | ||
510 | goto pcch_free; | ||
511 | } | ||
512 | |||
513 | doorbell_write = member->integer.value; | ||
514 | |||
515 | dprintk("probe: doorbell_preserve: 0x%llx," | ||
516 | " doorbell_write: 0x%llx\n", | ||
517 | doorbell_preserve, doorbell_write); | ||
518 | |||
519 | pcc_cpu_info = alloc_percpu(struct pcc_cpu); | ||
520 | if (!pcc_cpu_info) { | ||
521 | ret = -ENOMEM; | ||
522 | goto pcch_free; | ||
523 | } | ||
524 | |||
525 | printk(KERN_DEBUG "pcc-cpufreq: (v%s) driver loaded with frequency" | ||
526 | " limits: %d MHz, %d MHz\n", PCC_VERSION, | ||
527 | ioread32(&pcch_hdr->minimum_frequency), | ||
528 | ioread32(&pcch_hdr->nominal)); | ||
529 | kfree(output.pointer); | ||
530 | return ret; | ||
531 | pcch_free: | ||
532 | pcc_clear_mapping(); | ||
533 | out_free: | ||
534 | kfree(output.pointer); | ||
535 | return ret; | ||
536 | } | ||
537 | |||
538 | static int pcc_cpufreq_cpu_init(struct cpufreq_policy *policy) | ||
539 | { | ||
540 | unsigned int cpu = policy->cpu; | ||
541 | unsigned int result = 0; | ||
542 | |||
543 | if (!pcch_virt_addr) { | ||
544 | result = -1; | ||
545 | goto pcch_null; | ||
546 | } | ||
547 | |||
548 | result = pcc_get_offset(cpu); | ||
549 | if (result) { | ||
550 | dprintk("init: PCCP evaluation failed\n"); | ||
551 | goto free; | ||
552 | } | ||
553 | |||
554 | policy->max = policy->cpuinfo.max_freq = | ||
555 | ioread32(&pcch_hdr->nominal) * 1000; | ||
556 | policy->min = policy->cpuinfo.min_freq = | ||
557 | ioread32(&pcch_hdr->minimum_frequency) * 1000; | ||
558 | policy->cur = pcc_get_freq(cpu); | ||
559 | |||
560 | dprintk("init: policy->max is %d, policy->min is %d\n", | ||
561 | policy->max, policy->min); | ||
562 | |||
563 | return 0; | ||
564 | free: | ||
565 | pcc_clear_mapping(); | ||
566 | free_percpu(pcc_cpu_info); | ||
567 | pcch_null: | ||
568 | return result; | ||
569 | } | ||
570 | |||
571 | static int pcc_cpufreq_cpu_exit(struct cpufreq_policy *policy) | ||
572 | { | ||
573 | return 0; | ||
574 | } | ||
575 | |||
576 | static struct cpufreq_driver pcc_cpufreq_driver = { | ||
577 | .flags = CPUFREQ_CONST_LOOPS, | ||
578 | .get = pcc_get_freq, | ||
579 | .verify = pcc_cpufreq_verify, | ||
580 | .target = pcc_cpufreq_target, | ||
581 | .init = pcc_cpufreq_cpu_init, | ||
582 | .exit = pcc_cpufreq_cpu_exit, | ||
583 | .name = "pcc-cpufreq", | ||
584 | .owner = THIS_MODULE, | ||
585 | }; | ||
586 | |||
587 | static int __init pcc_cpufreq_init(void) | ||
588 | { | ||
589 | int ret; | ||
590 | |||
591 | if (acpi_disabled) | ||
592 | return 0; | ||
593 | |||
594 | ret = pcc_cpufreq_probe(); | ||
595 | if (ret) { | ||
596 | dprintk("pcc_cpufreq_init: PCCH evaluation failed\n"); | ||
597 | return ret; | ||
598 | } | ||
599 | |||
600 | ret = cpufreq_register_driver(&pcc_cpufreq_driver); | ||
601 | |||
602 | return ret; | ||
603 | } | ||
604 | |||
605 | static void __exit pcc_cpufreq_exit(void) | ||
606 | { | ||
607 | cpufreq_unregister_driver(&pcc_cpufreq_driver); | ||
608 | |||
609 | pcc_clear_mapping(); | ||
610 | |||
611 | free_percpu(pcc_cpu_info); | ||
612 | } | ||
613 | |||
614 | MODULE_AUTHOR("Matthew Garrett, Naga Chumbalkar"); | ||
615 | MODULE_VERSION(PCC_VERSION); | ||
616 | MODULE_DESCRIPTION("Processor Clocking Control interface driver"); | ||
617 | MODULE_LICENSE("GPL"); | ||
618 | |||
619 | late_initcall(pcc_cpufreq_init); | ||
620 | module_exit(pcc_cpufreq_exit); | ||