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Commit | Line | Data |
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433e63c6 MA |
1 | /* |
2 | * rar_register.c - An Intel Restricted Access Region register driver | |
3 | * | |
4 | * Copyright(c) 2009 Intel Corporation. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation; either version 2 of the | |
9 | * License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | * 02111-1307, USA. | |
20 | * | |
21 | * ------------------------------------------------------------------- | |
22 | * 20091204 Mark Allyn <mark.a.allyn@intel.com> | |
23 | * Ossama Othman <ossama.othman@intel.com> | |
24 | * Cleanup per feedback from Alan Cox and Arjan Van De Ven | |
25 | * | |
26 | * 20090806 Ossama Othman <ossama.othman@intel.com> | |
27 | * Return zero high address if upper 22 bits is zero. | |
28 | * Cleaned up checkpatch errors. | |
29 | * Clarified that driver is dealing with bus addresses. | |
30 | * | |
31 | * 20090702 Ossama Othman <ossama.othman@intel.com> | |
32 | * Removed unnecessary include directives | |
33 | * Cleaned up spinlocks. | |
34 | * Cleaned up logging. | |
35 | * Improved invalid parameter checks. | |
36 | * Fixed and simplified RAR address retrieval and RAR locking | |
37 | * code. | |
38 | * | |
39 | * 20090626 Mark Allyn <mark.a.allyn@intel.com> | |
40 | * Initial publish | |
41 | */ | |
42 | ||
433e63c6 MA |
43 | #include <linux/module.h> |
44 | #include <linux/pci.h> | |
45 | #include <linux/spinlock.h> | |
46 | #include <linux/device.h> | |
47 | #include <linux/kernel.h> | |
c715a38b | 48 | #include <linux/rar_register.h> |
542385ee AC |
49 | |
50 | /* === Lincroft Message Bus Interface === */ | |
375d65db AC |
51 | #define LNC_MCR_OFFSET 0xD0 /* Message Control Register */ |
52 | #define LNC_MDR_OFFSET 0xD4 /* Message Data Register */ | |
542385ee AC |
53 | |
54 | /* Message Opcodes */ | |
375d65db | 55 | #define LNC_MESSAGE_READ_OPCODE 0xD0 |
542385ee AC |
56 | #define LNC_MESSAGE_WRITE_OPCODE 0xE0 |
57 | ||
58 | /* Message Write Byte Enables */ | |
375d65db | 59 | #define LNC_MESSAGE_BYTE_WRITE_ENABLES 0xF |
542385ee AC |
60 | |
61 | /* B-unit Port */ | |
375d65db | 62 | #define LNC_BUNIT_PORT 0x3 |
542385ee AC |
63 | |
64 | /* === Lincroft B-Unit Registers - Programmed by IA32 firmware === */ | |
375d65db AC |
65 | #define LNC_BRAR0L 0x10 |
66 | #define LNC_BRAR0H 0x11 | |
67 | #define LNC_BRAR1L 0x12 | |
68 | #define LNC_BRAR1H 0x13 | |
542385ee | 69 | /* Reserved for SeP */ |
375d65db AC |
70 | #define LNC_BRAR2L 0x14 |
71 | #define LNC_BRAR2H 0x15 | |
542385ee | 72 | |
433e63c6 MA |
73 | /* Moorestown supports three restricted access regions. */ |
74 | #define MRST_NUM_RAR 3 | |
542385ee | 75 | |
433e63c6 | 76 | /* RAR Bus Address Range */ |
375d65db | 77 | struct rar_addr { |
433e63c6 MA |
78 | dma_addr_t low; |
79 | dma_addr_t high; | |
80 | }; | |
542385ee | 81 | |
375d65db AC |
82 | /* |
83 | * We create one of these for each RAR | |
84 | */ | |
433e63c6 | 85 | struct client { |
375d65db AC |
86 | int (*callback)(unsigned long data); |
87 | unsigned long driver_priv; | |
88 | bool busy; | |
89 | }; | |
542385ee | 90 | |
433e63c6 MA |
91 | static DEFINE_MUTEX(rar_mutex); |
92 | static DEFINE_MUTEX(lnc_reg_mutex); | |
542385ee | 93 | |
375d65db AC |
94 | /* |
95 | * One per RAR device (currently only one device) | |
96 | */ | |
97 | struct rar_device { | |
98 | struct rar_addr rar_addr[MRST_NUM_RAR]; | |
433e63c6 MA |
99 | struct pci_dev *rar_dev; |
100 | bool registered; | |
375d65db AC |
101 | bool allocated; |
102 | struct client client[MRST_NUM_RAR]; | |
542385ee AC |
103 | }; |
104 | ||
375d65db AC |
105 | /* Current platforms have only one rar_device for 3 rar regions */ |
106 | static struct rar_device my_rar_device; | |
107 | ||
108 | /* | |
109 | * Abstract out multiple device support. Current platforms only | |
110 | * have a single RAR device. | |
433e63c6 | 111 | */ |
542385ee | 112 | |
375d65db AC |
113 | /** |
114 | * alloc_rar_device - return a new RAR structure | |
115 | * | |
116 | * Return a new (but not yet ready) RAR device object | |
117 | */ | |
118 | static struct rar_device *alloc_rar_device(void) | |
119 | { | |
120 | if (my_rar_device.allocated) | |
121 | return NULL; | |
122 | my_rar_device.allocated = 1; | |
123 | return &my_rar_device; | |
124 | } | |
542385ee | 125 | |
375d65db AC |
126 | /** |
127 | * free_rar_device - free a RAR object | |
128 | * @rar: the RAR device being freed | |
129 | * | |
130 | * Release a RAR object and any attached resources | |
433e63c6 | 131 | */ |
375d65db AC |
132 | static void free_rar_device(struct rar_device *rar) |
133 | { | |
134 | pci_dev_put(rar->rar_dev); | |
135 | rar->allocated = 0; | |
136 | } | |
137 | ||
138 | /** | |
139 | * _rar_to_device - return the device handling this RAR | |
140 | * @rar: RAR number | |
141 | * @off: returned offset | |
142 | * | |
143 | * Internal helper for looking up RAR devices. This and alloc are the | |
144 | * two functions that need touching to go to multiple RAR devices. | |
145 | */ | |
146 | static struct rar_device *_rar_to_device(int rar, int *off) | |
147 | { | |
a9728c9a | 148 | if (rar >= 0 && rar < MRST_NUM_RAR) { |
375d65db AC |
149 | *off = rar; |
150 | return &my_rar_device; | |
151 | } | |
152 | return NULL; | |
153 | } | |
154 | ||
375d65db AC |
155 | /** |
156 | * rar_to_device - return the device handling this RAR | |
157 | * @rar: RAR number | |
158 | * @off: returned offset | |
159 | * | |
160 | * Return the device this RAR maps to if one is present, otherwise | |
161 | * returns NULL. Reports the offset relative to the base of this | |
162 | * RAR device in off. | |
163 | */ | |
164 | static struct rar_device *rar_to_device(int rar, int *off) | |
165 | { | |
166 | struct rar_device *rar_dev = _rar_to_device(rar, off); | |
167 | if (rar_dev == NULL || !rar_dev->registered) | |
168 | return NULL; | |
169 | return rar_dev; | |
170 | } | |
171 | ||
172 | /** | |
173 | * rar_to_client - return the client handling this RAR | |
174 | * @rar: RAR number | |
175 | * | |
176 | * Return the client this RAR maps to if a mapping is known, otherwise | |
177 | * returns NULL. | |
178 | */ | |
179 | static struct client *rar_to_client(int rar) | |
180 | { | |
181 | int idx; | |
182 | struct rar_device *r = _rar_to_device(rar, &idx); | |
183 | if (r != NULL) | |
184 | return &r->client[idx]; | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | /** | |
189 | * rar_read_addr - retrieve a RAR mapping | |
190 | * @pdev: PCI device for the RAR | |
191 | * @offset: offset for message | |
192 | * @addr: returned address | |
193 | * | |
194 | * Reads the address of a given RAR register. Returns 0 on success | |
195 | * or an error code on failure. | |
196 | */ | |
197 | static int rar_read_addr(struct pci_dev *pdev, int offset, dma_addr_t *addr) | |
542385ee AC |
198 | { |
199 | /* | |
200 | * ======== The Lincroft Message Bus Interface ======== | |
375d65db AC |
201 | * Lincroft registers may be obtained via PCI from |
202 | * the host bridge using the Lincroft Message Bus | |
542385ee AC |
203 | * Interface. That message bus interface is generally |
204 | * comprised of two registers: a control register (MCR, 0xDO) | |
205 | * and a data register (MDR, 0xD4). | |
206 | * | |
207 | * The MCR (message control register) format is the following: | |
208 | * 1. [31:24]: Opcode | |
209 | * 2. [23:16]: Port | |
210 | * 3. [15:8]: Register Offset | |
211 | * 4. [7:4]: Byte Enables (use 0xF to set all of these bits | |
212 | * to 1) | |
213 | * 5. [3:0]: reserved | |
214 | * | |
215 | * Read (0xD0) and write (0xE0) opcodes are written to the | |
216 | * control register when reading and writing to Lincroft | |
217 | * registers, respectively. | |
218 | * | |
219 | * We're interested in registers found in the Lincroft | |
220 | * B-unit. The B-unit port is 0x3. | |
221 | * | |
222 | * The six B-unit RAR register offsets we use are listed | |
223 | * earlier in this file. | |
224 | * | |
225 | * Lastly writing to the MCR register requires the "Byte | |
226 | * enables" bits to be set to 1. This may be achieved by | |
227 | * writing 0xF at bit 4. | |
228 | * | |
229 | * The MDR (message data register) format is the following: | |
230 | * 1. [31:0]: Read/Write Data | |
231 | * | |
232 | * Data being read from this register is only available after | |
233 | * writing the appropriate control message to the MCR | |
234 | * register. | |
235 | * | |
236 | * Data being written to this register must be written before | |
237 | * writing the appropriate control message to the MCR | |
238 | * register. | |
433e63c6 MA |
239 | */ |
240 | ||
241 | int result; | |
375d65db | 242 | u32 addr32; |
542385ee | 243 | |
542385ee AC |
244 | /* Construct control message */ |
245 | u32 const message = | |
433e63c6 MA |
246 | (LNC_MESSAGE_READ_OPCODE << 24) |
247 | | (LNC_BUNIT_PORT << 16) | |
248 | | (offset << 8) | |
249 | | (LNC_MESSAGE_BYTE_WRITE_ENABLES << 4); | |
542385ee | 250 | |
433e63c6 | 251 | dev_dbg(&pdev->dev, "Offset for 'get' LNC MSG is %x\n", offset); |
542385ee | 252 | |
433e63c6 MA |
253 | /* |
254 | * We synchronize access to the Lincroft MCR and MDR registers | |
255 | * until BOTH the command is issued through the MCR register | |
256 | * and the corresponding data is read from the MDR register. | |
257 | * Otherwise a race condition would exist between accesses to | |
258 | * both registers. | |
259 | */ | |
260 | ||
261 | mutex_lock(&lnc_reg_mutex); | |
542385ee AC |
262 | |
263 | /* Send the control message */ | |
433e63c6 | 264 | result = pci_write_config_dword(pdev, LNC_MCR_OFFSET, message); |
433e63c6 | 265 | if (!result) { |
375d65db AC |
266 | /* Read back the address as a 32bit value */ |
267 | result = pci_read_config_dword(pdev, LNC_MDR_OFFSET, &addr32); | |
268 | *addr = (dma_addr_t)addr32; | |
433e63c6 | 269 | } |
433e63c6 | 270 | mutex_unlock(&lnc_reg_mutex); |
433e63c6 | 271 | return result; |
542385ee AC |
272 | } |
273 | ||
375d65db AC |
274 | /** |
275 | * rar_set_addr - Set a RAR mapping | |
276 | * @pdev: PCI device for the RAR | |
277 | * @offset: offset for message | |
278 | * @addr: address to set | |
279 | * | |
280 | * Sets the address of a given RAR register. Returns 0 on success | |
281 | * or an error code on failure. | |
282 | */ | |
283 | static int rar_set_addr(struct pci_dev *pdev, | |
433e63c6 MA |
284 | int offset, |
285 | dma_addr_t addr) | |
542385ee AC |
286 | { |
287 | /* | |
433e63c6 MA |
288 | * Data being written to this register must be written before |
289 | * writing the appropriate control message to the MCR | |
290 | * register. | |
375d65db | 291 | * See rar_get_addrs() for a description of the |
433e63c6 MA |
292 | * message bus interface being used here. |
293 | */ | |
542385ee | 294 | |
375d65db | 295 | int result; |
542385ee AC |
296 | |
297 | /* Construct control message */ | |
433e63c6 MA |
298 | u32 const message = (LNC_MESSAGE_WRITE_OPCODE << 24) |
299 | | (LNC_BUNIT_PORT << 16) | |
300 | | (offset << 8) | |
301 | | (LNC_MESSAGE_BYTE_WRITE_ENABLES << 4); | |
542385ee | 302 | |
433e63c6 MA |
303 | /* |
304 | * We synchronize access to the Lincroft MCR and MDR registers | |
305 | * until BOTH the command is issued through the MCR register | |
306 | * and the corresponding data is read from the MDR register. | |
307 | * Otherwise a race condition would exist between accesses to | |
308 | * both registers. | |
309 | */ | |
310 | ||
311 | mutex_lock(&lnc_reg_mutex); | |
542385ee AC |
312 | |
313 | /* Send the control message */ | |
433e63c6 | 314 | result = pci_write_config_dword(pdev, LNC_MDR_OFFSET, addr); |
375d65db AC |
315 | if (!result) |
316 | /* And address */ | |
433e63c6 MA |
317 | result = pci_write_config_dword(pdev, LNC_MCR_OFFSET, message); |
318 | ||
433e63c6 | 319 | mutex_unlock(&lnc_reg_mutex); |
433e63c6 | 320 | return result; |
542385ee AC |
321 | } |
322 | ||
323 | /* | |
375d65db AC |
324 | * rar_init_params - Initialize RAR parameters |
325 | * @rar: RAR device to initialise | |
326 | * | |
327 | * Initialize RAR parameters, such as bus addresses, etc. Returns 0 | |
328 | * on success, or an error code on failure. | |
329 | */ | |
330 | static int init_rar_params(struct rar_device *rar) | |
542385ee | 331 | { |
375d65db | 332 | struct pci_dev *pdev = rar->rar_dev; |
433e63c6 | 333 | unsigned int i; |
542385ee | 334 | int result = 0; |
375d65db | 335 | int offset = 0x10; /* RAR 0 to 2 in order low/high/low/high/... */ |
542385ee | 336 | |
433e63c6 MA |
337 | /* Retrieve RAR start and end bus addresses. |
338 | * Access the RAR registers through the Lincroft Message Bus | |
339 | * Interface on PCI device: 00:00.0 Host bridge. | |
340 | */ | |
542385ee | 341 | |
433e63c6 | 342 | for (i = 0; i < MRST_NUM_RAR; ++i) { |
375d65db AC |
343 | struct rar_addr *addr = &rar->rar_addr[i]; |
344 | ||
345 | result = rar_read_addr(pdev, offset++, &addr->low); | |
346 | if (result != 0) | |
347 | return result; | |
348 | ||
349 | result = rar_read_addr(pdev, offset++, &addr->high); | |
350 | if (result != 0) | |
351 | return result; | |
352 | ||
542385ee | 353 | |
433e63c6 MA |
354 | /* |
355 | * Only the upper 22 bits of the RAR addresses are | |
356 | * stored in their corresponding RAR registers so we | |
357 | * must set the lower 10 bits accordingly. | |
358 | ||
359 | * The low address has its lower 10 bits cleared, and | |
360 | * the high address has all its lower 10 bits set, | |
361 | * e.g.: | |
362 | * low = 0x2ffffc00 | |
363 | */ | |
364 | ||
365 | addr->low &= (dma_addr_t)0xfffffc00u; | |
366 | ||
367 | /* | |
368 | * Set bits 9:0 on uppser address if bits 31:10 are non | |
369 | * zero; otherwize clear all bits | |
370 | */ | |
371 | ||
372 | if ((addr->high & 0xfffffc00u) == 0) | |
373 | addr->high = 0; | |
374 | else | |
375 | addr->high |= 0x3ffu; | |
376 | } | |
542385ee | 377 | /* Done accessing the device. */ |
542385ee AC |
378 | |
379 | if (result == 0) { | |
375d65db | 380 | for (i = 0; i != MRST_NUM_RAR; ++i) { |
433e63c6 MA |
381 | /* |
382 | * "BRAR" refers to the RAR registers in the | |
383 | * Lincroft B-unit. | |
384 | */ | |
385 | dev_info(&pdev->dev, "BRAR[%u] bus address range = " | |
375d65db AC |
386 | "[%lx, %lx]\n", i, |
387 | (unsigned long)rar->rar_addr[i].low, | |
388 | (unsigned long)rar->rar_addr[i].high); | |
433e63c6 MA |
389 | } |
390 | } | |
433e63c6 MA |
391 | return result; |
392 | } | |
393 | ||
375d65db AC |
394 | /** |
395 | * rar_get_address - get the bus address in a RAR | |
396 | * @start: return value of start address of block | |
397 | * @end: return value of end address of block | |
433e63c6 | 398 | * |
375d65db AC |
399 | * The rar_get_address function is used by other device drivers |
400 | * to obtain RAR address information on a RAR. It takes three | |
401 | * parameters: | |
433e63c6 | 402 | * |
375d65db AC |
403 | * The function returns a 0 upon success or an error if there is no RAR |
404 | * facility on this system. | |
433e63c6 | 405 | */ |
375d65db | 406 | int rar_get_address(int rar_index, dma_addr_t *start, dma_addr_t *end) |
433e63c6 | 407 | { |
375d65db AC |
408 | int idx; |
409 | struct rar_device *rar = rar_to_device(rar_index, &idx); | |
410 | ||
411 | if (rar == NULL) { | |
412 | WARN_ON(1); | |
413 | return -ENODEV; | |
542385ee AC |
414 | } |
415 | ||
375d65db AC |
416 | *start = rar->rar_addr[idx].low; |
417 | *end = rar->rar_addr[idx].high; | |
418 | return 0; | |
542385ee | 419 | } |
433e63c6 | 420 | EXPORT_SYMBOL(rar_get_address); |
542385ee | 421 | |
375d65db AC |
422 | /** |
423 | * rar_lock - lock a RAR register | |
424 | * @rar_index: RAR to lock (0-2) | |
433e63c6 | 425 | * |
375d65db AC |
426 | * The rar_lock function is ued by other device drivers to lock an RAR. |
427 | * once a RAR is locked, it stays locked until the next system reboot. | |
433e63c6 | 428 | * |
375d65db AC |
429 | * The function returns a 0 upon success or an error if there is no RAR |
430 | * facility on this system, or the locking fails | |
433e63c6 MA |
431 | */ |
432 | int rar_lock(int rar_index) | |
433 | { | |
375d65db AC |
434 | struct rar_device *rar; |
435 | int result; | |
436 | int idx; | |
437 | dma_addr_t low, high; | |
433e63c6 | 438 | |
375d65db | 439 | rar = rar_to_device(rar_index, &idx); |
433e63c6 | 440 | |
375d65db AC |
441 | if (rar == NULL) { |
442 | WARN_ON(1); | |
443 | return -EINVAL; | |
444 | } | |
433e63c6 | 445 | |
375d65db AC |
446 | low = rar->rar_addr[idx].low & 0xfffffc00u; |
447 | high = rar->rar_addr[idx].high & 0xfffffc00u; | |
433e63c6 | 448 | |
375d65db AC |
449 | /* |
450 | * Only allow I/O from the graphics and Langwell; | |
451 | * not from the x86 processor | |
452 | */ | |
433e63c6 | 453 | |
375d65db AC |
454 | if (rar_index == RAR_TYPE_VIDEO) { |
455 | low |= 0x00000009; | |
456 | high |= 0x00000015; | |
457 | } else if (rar_index == RAR_TYPE_AUDIO) { | |
458 | /* Only allow I/O from Langwell; nothing from x86 */ | |
459 | low |= 0x00000008; | |
460 | high |= 0x00000018; | |
461 | } else | |
462 | /* Read-only from all agents */ | |
463 | high |= 0x00000018; | |
433e63c6 | 464 | |
375d65db AC |
465 | /* |
466 | * Now program the register using the Lincroft message | |
467 | * bus interface. | |
468 | */ | |
469 | result = rar_set_addr(rar->rar_dev, | |
470 | 2 * idx, low); | |
433e63c6 | 471 | |
375d65db AC |
472 | if (result == 0) |
473 | result = rar_set_addr(rar->rar_dev, | |
474 | 2 * idx + 1, high); | |
433e63c6 | 475 | |
433e63c6 MA |
476 | return result; |
477 | } | |
478 | EXPORT_SYMBOL(rar_lock); | |
479 | ||
375d65db AC |
480 | /** |
481 | * register_rar - register a RAR handler | |
482 | * @num: RAR we wish to register for | |
483 | * @callback: function to call when RAR support is available | |
484 | * @data: data to pass to this function | |
485 | * | |
486 | * The register_rar function is to used by other device drivers | |
487 | * to ensure that this driver is ready. As we cannot be sure of | |
c8440336 | 488 | * the compile/execute order of drivers in the kernel, it is |
375d65db AC |
489 | * best to give this driver a callback function to call when |
490 | * it is ready to give out addresses. The callback function | |
491 | * would have those steps that continue the initialization of | |
492 | * a driver that do require a valid RAR address. One of those | |
493 | * steps would be to call rar_get_address() | |
494 | * | |
c715a38b | 495 | * This function return 0 on success or an error code on failure. |
375d65db AC |
496 | */ |
497 | int register_rar(int num, int (*callback)(unsigned long data), | |
498 | unsigned long data) | |
542385ee | 499 | { |
375d65db AC |
500 | /* For now we hardcode a single RAR device */ |
501 | struct rar_device *rar; | |
502 | struct client *c; | |
503 | int idx; | |
504 | int retval = 0; | |
433e63c6 MA |
505 | |
506 | mutex_lock(&rar_mutex); | |
507 | ||
375d65db AC |
508 | /* Do we have a client mapping for this RAR number ? */ |
509 | c = rar_to_client(num); | |
510 | if (c == NULL) { | |
511 | retval = -ERANGE; | |
512 | goto done; | |
513 | } | |
514 | /* Is it claimed ? */ | |
515 | if (c->busy) { | |
516 | retval = -EBUSY; | |
517 | goto done; | |
518 | } | |
519 | c->busy = 1; | |
520 | ||
521 | /* See if we have a handler for this RAR yet, if we do then fire it */ | |
522 | rar = rar_to_device(num, &idx); | |
433e63c6 | 523 | |
375d65db | 524 | if (rar) { |
433e63c6 MA |
525 | /* |
526 | * if the driver already registered, then we can simply | |
527 | * call the callback right now | |
528 | */ | |
375d65db AC |
529 | (*callback)(data); |
530 | goto done; | |
433e63c6 MA |
531 | } |
532 | ||
375d65db AC |
533 | /* Arrange to be called back when the hardware is found */ |
534 | c->callback = callback; | |
535 | c->driver_priv = data; | |
536 | done: | |
433e63c6 | 537 | mutex_unlock(&rar_mutex); |
375d65db | 538 | return retval; |
433e63c6 MA |
539 | } |
540 | EXPORT_SYMBOL(register_rar); | |
541 | ||
375d65db AC |
542 | /** |
543 | * unregister_rar - release a RAR allocation | |
544 | * @num: RAR number | |
545 | * | |
546 | * Releases a RAR allocation, or pending allocation. If a callback is | |
547 | * pending then this function will either complete before the unregister | |
548 | * returns or not at all. | |
549 | */ | |
550 | ||
551 | void unregister_rar(int num) | |
3913add4 | 552 | { |
375d65db AC |
553 | struct client *c; |
554 | ||
555 | mutex_lock(&rar_mutex); | |
556 | c = rar_to_client(num); | |
557 | if (c == NULL || !c->busy) | |
558 | WARN_ON(1); | |
559 | else | |
560 | c->busy = 0; | |
561 | mutex_unlock(&rar_mutex); | |
3913add4 | 562 | } |
375d65db | 563 | EXPORT_SYMBOL(unregister_rar); |
3913add4 | 564 | |
375d65db AC |
565 | /** |
566 | * rar_callback - Process callbacks | |
567 | * @rar: new RAR device | |
568 | * | |
569 | * Process the callbacks for a newly found RAR device. | |
570 | */ | |
571 | ||
572 | static void rar_callback(struct rar_device *rar) | |
3913add4 | 573 | { |
375d65db AC |
574 | struct client *c = &rar->client[0]; |
575 | int i; | |
576 | ||
577 | mutex_lock(&rar_mutex); | |
578 | ||
579 | rar->registered = 1; /* Ensure no more callbacks queue */ | |
580 | ||
581 | for (i = 0; i < MRST_NUM_RAR; i++) { | |
582 | if (c->callback && c->busy) { | |
583 | c->callback(c->driver_priv); | |
584 | c->callback = NULL; | |
585 | } | |
586 | c++; | |
587 | } | |
588 | mutex_unlock(&rar_mutex); | |
3913add4 MA |
589 | } |
590 | ||
375d65db AC |
591 | /** |
592 | * rar_probe - PCI probe callback | |
593 | * @dev: PCI device | |
594 | * @id: matching entry in the match table | |
595 | * | |
596 | * A RAR device has been discovered. Initialise it and if successful | |
597 | * process any pending callbacks that can now be completed. | |
433e63c6 MA |
598 | */ |
599 | static int rar_probe(struct pci_dev *dev, const struct pci_device_id *id) | |
600 | { | |
601 | int error; | |
375d65db | 602 | struct rar_device *rar; |
433e63c6 MA |
603 | |
604 | dev_dbg(&dev->dev, "PCI probe starting\n"); | |
542385ee | 605 | |
375d65db AC |
606 | rar = alloc_rar_device(); |
607 | if (rar == NULL) | |
608 | return -EBUSY; | |
609 | ||
610 | /* Enable the device */ | |
433e63c6 | 611 | error = pci_enable_device(dev); |
542385ee | 612 | if (error) { |
433e63c6 MA |
613 | dev_err(&dev->dev, |
614 | "Error enabling RAR register PCI device\n"); | |
542385ee AC |
615 | goto end_function; |
616 | } | |
617 | ||
375d65db AC |
618 | /* Fill in the rar_device structure */ |
619 | rar->rar_dev = pci_dev_get(dev); | |
620 | pci_set_drvdata(dev, rar); | |
542385ee | 621 | |
433e63c6 | 622 | /* |
375d65db AC |
623 | * Initialize the RAR parameters, which have to be retrieved |
624 | * via the message bus interface. | |
625 | */ | |
626 | error = init_rar_params(rar); | |
542385ee | 627 | if (error) { |
433e63c6 | 628 | pci_disable_device(dev); |
375d65db | 629 | dev_err(&dev->dev, "Error retrieving RAR addresses\n"); |
542385ee | 630 | goto end_function; |
433e63c6 | 631 | } |
433e63c6 | 632 | /* now call anyone who has registered (using callbacks) */ |
375d65db AC |
633 | rar_callback(rar); |
634 | return 0; | |
542385ee | 635 | end_function: |
375d65db | 636 | free_rar_device(rar); |
542385ee AC |
637 | return error; |
638 | } | |
639 | ||
b73210ae | 640 | static DEFINE_PCI_DEVICE_TABLE(rar_pci_id_tbl) = { |
375d65db | 641 | { PCI_VDEVICE(INTEL, 0x4110) }, |
433e63c6 MA |
642 | { 0 } |
643 | }; | |
644 | ||
645 | MODULE_DEVICE_TABLE(pci, rar_pci_id_tbl); | |
646 | ||
433e63c6 MA |
647 | /* field for registering driver to PCI device */ |
648 | static struct pci_driver rar_pci_driver = { | |
649 | .name = "rar_register_driver", | |
650 | .id_table = rar_pci_id_tbl, | |
3913add4 | 651 | .probe = rar_probe, |
375d65db | 652 | /* Cannot be unplugged - no remove */ |
433e63c6 MA |
653 | }; |
654 | ||
542385ee AC |
655 | static int __init rar_init_handler(void) |
656 | { | |
657 | return pci_register_driver(&rar_pci_driver); | |
658 | } | |
659 | ||
660 | static void __exit rar_exit_handler(void) | |
661 | { | |
662 | pci_unregister_driver(&rar_pci_driver); | |
663 | } | |
664 | ||
665 | module_init(rar_init_handler); | |
666 | module_exit(rar_exit_handler); | |
667 | ||
668 | MODULE_LICENSE("GPL"); | |
433e63c6 | 669 | MODULE_DESCRIPTION("Intel Restricted Access Region Register Driver"); |