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1 | /* |
2 | * drivers/acpi/resource.c - ACPI device resources interpretation. | |
3 | * | |
4 | * Copyright (C) 2012, Intel Corp. | |
5 | * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as published | |
11 | * by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
21 | * | |
22 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
23 | */ | |
24 | ||
25 | #include <linux/acpi.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/export.h> | |
28 | #include <linux/ioport.h> | |
29 | ||
30 | #ifdef CONFIG_X86 | |
31 | #define valid_IRQ(i) (((i) != 0) && ((i) != 2)) | |
32 | #else | |
33 | #define valid_IRQ(i) (true) | |
34 | #endif | |
35 | ||
36 | static unsigned long acpi_dev_memresource_flags(u64 len, u8 write_protect, | |
37 | bool window) | |
38 | { | |
39 | unsigned long flags = IORESOURCE_MEM; | |
40 | ||
41 | if (len == 0) | |
42 | flags |= IORESOURCE_DISABLED; | |
43 | ||
44 | if (write_protect == ACPI_READ_WRITE_MEMORY) | |
45 | flags |= IORESOURCE_MEM_WRITEABLE; | |
46 | ||
47 | if (window) | |
48 | flags |= IORESOURCE_WINDOW; | |
49 | ||
50 | return flags; | |
51 | } | |
52 | ||
53 | static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len, | |
54 | u8 write_protect) | |
55 | { | |
56 | res->start = start; | |
57 | res->end = start + len - 1; | |
58 | res->flags = acpi_dev_memresource_flags(len, write_protect, false); | |
59 | } | |
60 | ||
61 | /** | |
62 | * acpi_dev_resource_memory - Extract ACPI memory resource information. | |
63 | * @ares: Input ACPI resource object. | |
64 | * @res: Output generic resource object. | |
65 | * | |
66 | * Check if the given ACPI resource object represents a memory resource and | |
67 | * if that's the case, use the information in it to populate the generic | |
68 | * resource object pointed to by @res. | |
69 | */ | |
70 | bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res) | |
71 | { | |
72 | struct acpi_resource_memory24 *memory24; | |
73 | struct acpi_resource_memory32 *memory32; | |
74 | struct acpi_resource_fixed_memory32 *fixed_memory32; | |
75 | ||
76 | switch (ares->type) { | |
77 | case ACPI_RESOURCE_TYPE_MEMORY24: | |
78 | memory24 = &ares->data.memory24; | |
79 | acpi_dev_get_memresource(res, memory24->minimum, | |
80 | memory24->address_length, | |
81 | memory24->write_protect); | |
82 | break; | |
83 | case ACPI_RESOURCE_TYPE_MEMORY32: | |
84 | memory32 = &ares->data.memory32; | |
85 | acpi_dev_get_memresource(res, memory32->minimum, | |
86 | memory32->address_length, | |
87 | memory32->write_protect); | |
88 | break; | |
89 | case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: | |
90 | fixed_memory32 = &ares->data.fixed_memory32; | |
91 | acpi_dev_get_memresource(res, fixed_memory32->address, | |
92 | fixed_memory32->address_length, | |
93 | fixed_memory32->write_protect); | |
94 | break; | |
95 | default: | |
96 | return false; | |
97 | } | |
98 | return true; | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(acpi_dev_resource_memory); | |
101 | ||
102 | static unsigned int acpi_dev_ioresource_flags(u64 start, u64 end, u8 io_decode, | |
103 | bool window) | |
104 | { | |
105 | int flags = IORESOURCE_IO; | |
106 | ||
107 | if (io_decode == ACPI_DECODE_16) | |
108 | flags |= IORESOURCE_IO_16BIT_ADDR; | |
109 | ||
110 | if (start > end || end >= 0x10003) | |
111 | flags |= IORESOURCE_DISABLED; | |
112 | ||
113 | if (window) | |
114 | flags |= IORESOURCE_WINDOW; | |
115 | ||
116 | return flags; | |
117 | } | |
118 | ||
119 | static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len, | |
120 | u8 io_decode) | |
121 | { | |
122 | u64 end = start + len - 1; | |
123 | ||
124 | res->start = start; | |
125 | res->end = end; | |
126 | res->flags = acpi_dev_ioresource_flags(start, end, io_decode, false); | |
127 | } | |
128 | ||
129 | /** | |
130 | * acpi_dev_resource_io - Extract ACPI I/O resource information. | |
131 | * @ares: Input ACPI resource object. | |
132 | * @res: Output generic resource object. | |
133 | * | |
134 | * Check if the given ACPI resource object represents an I/O resource and | |
135 | * if that's the case, use the information in it to populate the generic | |
136 | * resource object pointed to by @res. | |
137 | */ | |
138 | bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res) | |
139 | { | |
140 | struct acpi_resource_io *io; | |
141 | struct acpi_resource_fixed_io *fixed_io; | |
142 | ||
143 | switch (ares->type) { | |
144 | case ACPI_RESOURCE_TYPE_IO: | |
145 | io = &ares->data.io; | |
146 | acpi_dev_get_ioresource(res, io->minimum, | |
147 | io->address_length, | |
148 | io->io_decode); | |
149 | break; | |
150 | case ACPI_RESOURCE_TYPE_FIXED_IO: | |
151 | fixed_io = &ares->data.fixed_io; | |
152 | acpi_dev_get_ioresource(res, fixed_io->address, | |
153 | fixed_io->address_length, | |
154 | ACPI_DECODE_10); | |
155 | break; | |
156 | default: | |
157 | return false; | |
158 | } | |
159 | return true; | |
160 | } | |
161 | EXPORT_SYMBOL_GPL(acpi_dev_resource_io); | |
162 | ||
163 | /** | |
164 | * acpi_dev_resource_address_space - Extract ACPI address space information. | |
165 | * @ares: Input ACPI resource object. | |
166 | * @res: Output generic resource object. | |
167 | * | |
168 | * Check if the given ACPI resource object represents an address space resource | |
169 | * and if that's the case, use the information in it to populate the generic | |
170 | * resource object pointed to by @res. | |
171 | */ | |
172 | bool acpi_dev_resource_address_space(struct acpi_resource *ares, | |
173 | struct resource *res) | |
174 | { | |
175 | acpi_status status; | |
176 | struct acpi_resource_address64 addr; | |
177 | bool window; | |
178 | u64 len; | |
179 | u8 io_decode; | |
180 | ||
181 | switch (ares->type) { | |
182 | case ACPI_RESOURCE_TYPE_ADDRESS16: | |
183 | case ACPI_RESOURCE_TYPE_ADDRESS32: | |
184 | case ACPI_RESOURCE_TYPE_ADDRESS64: | |
185 | break; | |
186 | default: | |
187 | return false; | |
188 | } | |
189 | ||
190 | status = acpi_resource_to_address64(ares, &addr); | |
191 | if (ACPI_FAILURE(status)) | |
192 | return true; | |
193 | ||
194 | res->start = addr.minimum; | |
195 | res->end = addr.maximum; | |
196 | window = addr.producer_consumer == ACPI_PRODUCER; | |
197 | ||
198 | switch(addr.resource_type) { | |
199 | case ACPI_MEMORY_RANGE: | |
200 | len = addr.maximum - addr.minimum + 1; | |
201 | res->flags = acpi_dev_memresource_flags(len, | |
202 | addr.info.mem.write_protect, | |
203 | window); | |
204 | break; | |
205 | case ACPI_IO_RANGE: | |
206 | io_decode = addr.granularity == 0xfff ? | |
207 | ACPI_DECODE_10 : ACPI_DECODE_16; | |
208 | res->flags = acpi_dev_ioresource_flags(addr.minimum, | |
209 | addr.maximum, | |
210 | io_decode, window); | |
211 | break; | |
212 | case ACPI_BUS_NUMBER_RANGE: | |
213 | res->flags = IORESOURCE_BUS; | |
214 | break; | |
215 | default: | |
216 | res->flags = 0; | |
217 | } | |
218 | ||
219 | return true; | |
220 | } | |
221 | EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space); | |
222 | ||
223 | /** | |
224 | * acpi_dev_resource_ext_address_space - Extract ACPI address space information. | |
225 | * @ares: Input ACPI resource object. | |
226 | * @res: Output generic resource object. | |
227 | * | |
228 | * Check if the given ACPI resource object represents an extended address space | |
229 | * resource and if that's the case, use the information in it to populate the | |
230 | * generic resource object pointed to by @res. | |
231 | */ | |
232 | bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares, | |
233 | struct resource *res) | |
234 | { | |
235 | struct acpi_resource_extended_address64 *ext_addr; | |
236 | bool window; | |
237 | u64 len; | |
238 | u8 io_decode; | |
239 | ||
240 | if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64) | |
241 | return false; | |
242 | ||
243 | ext_addr = &ares->data.ext_address64; | |
244 | ||
245 | res->start = ext_addr->minimum; | |
246 | res->end = ext_addr->maximum; | |
247 | window = ext_addr->producer_consumer == ACPI_PRODUCER; | |
248 | ||
249 | switch(ext_addr->resource_type) { | |
250 | case ACPI_MEMORY_RANGE: | |
251 | len = ext_addr->maximum - ext_addr->minimum + 1; | |
252 | res->flags = acpi_dev_memresource_flags(len, | |
253 | ext_addr->info.mem.write_protect, | |
254 | window); | |
255 | break; | |
256 | case ACPI_IO_RANGE: | |
257 | io_decode = ext_addr->granularity == 0xfff ? | |
258 | ACPI_DECODE_10 : ACPI_DECODE_16; | |
259 | res->flags = acpi_dev_ioresource_flags(ext_addr->minimum, | |
260 | ext_addr->maximum, | |
261 | io_decode, window); | |
262 | break; | |
263 | case ACPI_BUS_NUMBER_RANGE: | |
264 | res->flags = IORESOURCE_BUS; | |
265 | break; | |
266 | default: | |
267 | res->flags = 0; | |
268 | } | |
269 | ||
270 | return true; | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space); | |
273 | ||
274 | /** | |
275 | * acpi_dev_irq_flags - Determine IRQ resource flags. | |
276 | * @triggering: Triggering type as provided by ACPI. | |
277 | * @polarity: Interrupt polarity as provided by ACPI. | |
278 | * @shareable: Whether or not the interrupt is shareable. | |
279 | */ | |
280 | unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable) | |
281 | { | |
282 | unsigned long flags; | |
283 | ||
284 | if (triggering == ACPI_LEVEL_SENSITIVE) | |
285 | flags = polarity == ACPI_ACTIVE_LOW ? | |
286 | IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL; | |
287 | else | |
288 | flags = polarity == ACPI_ACTIVE_LOW ? | |
289 | IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE; | |
290 | ||
291 | if (shareable == ACPI_SHARED) | |
292 | flags |= IORESOURCE_IRQ_SHAREABLE; | |
293 | ||
294 | return flags | IORESOURCE_IRQ; | |
295 | } | |
296 | EXPORT_SYMBOL_GPL(acpi_dev_irq_flags); | |
297 | ||
298 | static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi) | |
299 | { | |
300 | res->start = gsi; | |
301 | res->end = gsi; | |
302 | res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED; | |
303 | } | |
304 | ||
305 | static void acpi_dev_get_irqresource(struct resource *res, u32 gsi, | |
306 | u8 triggering, u8 polarity, u8 shareable) | |
307 | { | |
308 | int irq, p, t; | |
309 | ||
310 | if (!valid_IRQ(gsi)) { | |
311 | acpi_dev_irqresource_disabled(res, gsi); | |
312 | return; | |
313 | } | |
314 | ||
315 | /* | |
316 | * In IO-APIC mode, use overrided attribute. Two reasons: | |
317 | * 1. BIOS bug in DSDT | |
318 | * 2. BIOS uses IO-APIC mode Interrupt Source Override | |
319 | */ | |
320 | if (!acpi_get_override_irq(gsi, &t, &p)) { | |
321 | u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; | |
322 | u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; | |
323 | ||
324 | if (triggering != trig || polarity != pol) { | |
325 | pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi, | |
326 | t ? "edge" : "level", p ? "low" : "high"); | |
327 | triggering = trig; | |
328 | polarity = pol; | |
329 | } | |
330 | } | |
331 | ||
332 | res->flags = acpi_dev_irq_flags(triggering, polarity, shareable); | |
333 | irq = acpi_register_gsi(NULL, gsi, triggering, polarity); | |
334 | if (irq >= 0) { | |
335 | res->start = irq; | |
336 | res->end = irq; | |
337 | } else { | |
338 | acpi_dev_irqresource_disabled(res, gsi); | |
339 | } | |
340 | } | |
341 | ||
342 | /** | |
343 | * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information. | |
344 | * @ares: Input ACPI resource object. | |
345 | * @index: Index into the array of GSIs represented by the resource. | |
346 | * @res: Output generic resource object. | |
347 | * | |
348 | * Check if the given ACPI resource object represents an interrupt resource | |
349 | * and @index does not exceed the resource's interrupt count (true is returned | |
350 | * in that case regardless of the results of the other checks)). If that's the | |
351 | * case, register the GSI corresponding to @index from the array of interrupts | |
352 | * represented by the resource and populate the generic resource object pointed | |
353 | * to by @res accordingly. If the registration of the GSI is not successful, | |
354 | * IORESOURCE_DISABLED will be set it that object's flags. | |
355 | */ | |
356 | bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index, | |
357 | struct resource *res) | |
358 | { | |
359 | struct acpi_resource_irq *irq; | |
360 | struct acpi_resource_extended_irq *ext_irq; | |
361 | ||
362 | switch (ares->type) { | |
363 | case ACPI_RESOURCE_TYPE_IRQ: | |
364 | /* | |
365 | * Per spec, only one interrupt per descriptor is allowed in | |
366 | * _CRS, but some firmware violates this, so parse them all. | |
367 | */ | |
368 | irq = &ares->data.irq; | |
369 | if (index >= irq->interrupt_count) { | |
370 | acpi_dev_irqresource_disabled(res, 0); | |
371 | return false; | |
372 | } | |
373 | acpi_dev_get_irqresource(res, irq->interrupts[index], | |
374 | irq->triggering, irq->polarity, | |
375 | irq->sharable); | |
376 | break; | |
377 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: | |
378 | ext_irq = &ares->data.extended_irq; | |
379 | if (index >= ext_irq->interrupt_count) { | |
380 | acpi_dev_irqresource_disabled(res, 0); | |
381 | return false; | |
382 | } | |
383 | acpi_dev_get_irqresource(res, ext_irq->interrupts[index], | |
384 | ext_irq->triggering, ext_irq->polarity, | |
385 | ext_irq->sharable); | |
386 | break; | |
387 | default: | |
388 | return false; | |
389 | } | |
390 | ||
391 | return true; | |
392 | } | |
393 | EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt); |