Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame^] | 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); |