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86c22f8c AC |
1 | /* |
2 | * Copyright (C) 2014 Linaro Ltd. | |
3 | * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org> | |
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 as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * PCC (Platform Communication Channel) is defined in the ACPI 5.0+ | |
16 | * specification. It is a mailbox like mechanism to allow clients | |
17 | * such as CPPC (Collaborative Processor Performance Control), RAS | |
18 | * (Reliability, Availability and Serviceability) and MPST (Memory | |
19 | * Node Power State Table) to talk to the platform (e.g. BMC) through | |
20 | * shared memory regions as defined in the PCC table entries. The PCC | |
21 | * specification supports a Doorbell mechanism for the PCC clients | |
22 | * to notify the platform about new data. This Doorbell information | |
33350e6b | 23 | * is also specified in each PCC table entry. |
86c22f8c | 24 | * |
33350e6b AC |
25 | * Typical high level flow of operation is: |
26 | * | |
27 | * PCC Reads: | |
28 | * * Client tries to acquire a channel lock. | |
29 | * * After it is acquired it writes READ cmd in communication region cmd | |
30 | * address. | |
31 | * * Client issues mbox_send_message() which rings the PCC doorbell | |
32 | * for its PCC channel. | |
33 | * * If command completes, then client has control over channel and | |
34 | * it can proceed with its reads. | |
35 | * * Client releases lock. | |
36 | * | |
37 | * PCC Writes: | |
38 | * * Client tries to acquire channel lock. | |
39 | * * Client writes to its communication region after it acquires a | |
40 | * channel lock. | |
41 | * * Client writes WRITE cmd in communication region cmd address. | |
42 | * * Client issues mbox_send_message() which rings the PCC doorbell | |
43 | * for its PCC channel. | |
44 | * * If command completes, then writes have succeded and it can release | |
45 | * the channel lock. | |
46 | * | |
47 | * There is a Nominal latency defined for each channel which indicates | |
48 | * how long to wait until a command completes. If command is not complete | |
49 | * the client needs to retry or assume failure. | |
50 | * | |
51 | * For more details about PCC, please see the ACPI specification from | |
86c22f8c AC |
52 | * http://www.uefi.org/ACPIv5.1 Section 14. |
53 | * | |
54 | * This file implements PCC as a Mailbox controller and allows for PCC | |
55 | * clients to be implemented as its Mailbox Client Channels. | |
56 | */ | |
57 | ||
58 | #include <linux/acpi.h> | |
59 | #include <linux/delay.h> | |
60 | #include <linux/io.h> | |
61 | #include <linux/init.h> | |
aca314ef | 62 | #include <linux/interrupt.h> |
86c22f8c AC |
63 | #include <linux/list.h> |
64 | #include <linux/platform_device.h> | |
65 | #include <linux/mailbox_controller.h> | |
66 | #include <linux/mailbox_client.h> | |
8b0f5788 | 67 | #include <linux/io-64-nonatomic-lo-hi.h> |
6ca595a7 | 68 | #include <acpi/pcc.h> |
86c22f8c AC |
69 | |
70 | #include "mailbox.h" | |
71 | ||
72 | #define MAX_PCC_SUBSPACES 256 | |
aca314ef | 73 | #define MBOX_IRQ_NAME "pcc-mbox" |
86c22f8c AC |
74 | |
75 | static struct mbox_chan *pcc_mbox_channels; | |
76 | ||
8b0f5788 PP |
77 | /* Array of cached virtual address for doorbell registers */ |
78 | static void __iomem **pcc_doorbell_vaddr; | |
aca314ef | 79 | /* Array of cached virtual address for doorbell ack registers */ |
80 | static void __iomem **pcc_doorbell_ack_vaddr; | |
81 | /* Array of doorbell interrupts */ | |
82 | static int *pcc_doorbell_irq; | |
8b0f5788 | 83 | |
86c22f8c AC |
84 | static struct mbox_controller pcc_mbox_ctrl = {}; |
85 | /** | |
86 | * get_pcc_channel - Given a PCC subspace idx, get | |
87 | * the respective mbox_channel. | |
88 | * @id: PCC subspace index. | |
89 | * | |
90 | * Return: ERR_PTR(errno) if error, else pointer | |
91 | * to mbox channel. | |
92 | */ | |
93 | static struct mbox_chan *get_pcc_channel(int id) | |
94 | { | |
86c22f8c AC |
95 | if (id < 0 || id > pcc_mbox_ctrl.num_chans) |
96 | return ERR_PTR(-ENOENT); | |
97 | ||
e9c8dc8b | 98 | return &pcc_mbox_channels[id]; |
86c22f8c AC |
99 | } |
100 | ||
aca314ef | 101 | /* |
102 | * PCC can be used with perf critical drivers such as CPPC | |
103 | * So it makes sense to locally cache the virtual address and | |
104 | * use it to read/write to PCC registers such as doorbell register | |
105 | * | |
106 | * The below read_register and write_registers are used to read and | |
107 | * write from perf critical registers such as PCC doorbell register | |
108 | */ | |
109 | static int read_register(void __iomem *vaddr, u64 *val, unsigned int bit_width) | |
110 | { | |
111 | int ret_val = 0; | |
112 | ||
113 | switch (bit_width) { | |
114 | case 8: | |
115 | *val = readb(vaddr); | |
116 | break; | |
117 | case 16: | |
118 | *val = readw(vaddr); | |
119 | break; | |
120 | case 32: | |
121 | *val = readl(vaddr); | |
122 | break; | |
123 | case 64: | |
124 | *val = readq(vaddr); | |
125 | break; | |
126 | default: | |
127 | pr_debug("Error: Cannot read register of %u bit width", | |
128 | bit_width); | |
129 | ret_val = -EFAULT; | |
130 | break; | |
131 | } | |
132 | return ret_val; | |
133 | } | |
134 | ||
135 | static int write_register(void __iomem *vaddr, u64 val, unsigned int bit_width) | |
136 | { | |
137 | int ret_val = 0; | |
138 | ||
139 | switch (bit_width) { | |
140 | case 8: | |
141 | writeb(val, vaddr); | |
142 | break; | |
143 | case 16: | |
144 | writew(val, vaddr); | |
145 | break; | |
146 | case 32: | |
147 | writel(val, vaddr); | |
148 | break; | |
149 | case 64: | |
150 | writeq(val, vaddr); | |
151 | break; | |
152 | default: | |
153 | pr_debug("Error: Cannot write register of %u bit width", | |
154 | bit_width); | |
155 | ret_val = -EFAULT; | |
156 | break; | |
157 | } | |
158 | return ret_val; | |
159 | } | |
160 | ||
161 | /** | |
162 | * pcc_map_interrupt - Map a PCC subspace GSI to a linux IRQ number | |
163 | * @interrupt: GSI number. | |
164 | * @flags: interrupt flags | |
165 | * | |
166 | * Returns: a valid linux IRQ number on success | |
167 | * 0 or -EINVAL on failure | |
168 | */ | |
169 | static int pcc_map_interrupt(u32 interrupt, u32 flags) | |
170 | { | |
171 | int trigger, polarity; | |
172 | ||
173 | if (!interrupt) | |
174 | return 0; | |
175 | ||
176 | trigger = (flags & ACPI_PCCT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE | |
177 | : ACPI_LEVEL_SENSITIVE; | |
178 | ||
179 | polarity = (flags & ACPI_PCCT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW | |
180 | : ACPI_ACTIVE_HIGH; | |
181 | ||
182 | return acpi_register_gsi(NULL, interrupt, trigger, polarity); | |
183 | } | |
184 | ||
185 | /** | |
186 | * pcc_mbox_irq - PCC mailbox interrupt handler | |
187 | */ | |
188 | static irqreturn_t pcc_mbox_irq(int irq, void *p) | |
189 | { | |
190 | struct acpi_generic_address *doorbell_ack; | |
191 | struct acpi_pcct_hw_reduced *pcct_ss; | |
192 | struct mbox_chan *chan = p; | |
193 | u64 doorbell_ack_preserve; | |
194 | u64 doorbell_ack_write; | |
195 | u64 doorbell_ack_val; | |
196 | int ret; | |
197 | ||
198 | pcct_ss = chan->con_priv; | |
199 | ||
200 | mbox_chan_received_data(chan, NULL); | |
201 | ||
202 | if (pcct_ss->header.type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) { | |
203 | struct acpi_pcct_hw_reduced_type2 *pcct2_ss = chan->con_priv; | |
204 | u32 id = chan - pcc_mbox_channels; | |
205 | ||
206 | doorbell_ack = &pcct2_ss->doorbell_ack_register; | |
207 | doorbell_ack_preserve = pcct2_ss->ack_preserve_mask; | |
208 | doorbell_ack_write = pcct2_ss->ack_write_mask; | |
209 | ||
210 | ret = read_register(pcc_doorbell_ack_vaddr[id], | |
211 | &doorbell_ack_val, | |
212 | doorbell_ack->bit_width); | |
213 | if (ret) | |
214 | return IRQ_NONE; | |
215 | ||
216 | ret = write_register(pcc_doorbell_ack_vaddr[id], | |
217 | (doorbell_ack_val & doorbell_ack_preserve) | |
218 | | doorbell_ack_write, | |
219 | doorbell_ack->bit_width); | |
220 | if (ret) | |
221 | return IRQ_NONE; | |
222 | } | |
223 | ||
224 | return IRQ_HANDLED; | |
225 | } | |
226 | ||
86c22f8c AC |
227 | /** |
228 | * pcc_mbox_request_channel - PCC clients call this function to | |
229 | * request a pointer to their PCC subspace, from which they | |
230 | * can get the details of communicating with the remote. | |
231 | * @cl: Pointer to Mailbox client, so we know where to bind the | |
232 | * Channel. | |
233 | * @subspace_id: The PCC Subspace index as parsed in the PCC client | |
234 | * ACPI package. This is used to lookup the array of PCC | |
235 | * subspaces as parsed by the PCC Mailbox controller. | |
236 | * | |
237 | * Return: Pointer to the Mailbox Channel if successful or | |
238 | * ERR_PTR. | |
239 | */ | |
240 | struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl, | |
241 | int subspace_id) | |
242 | { | |
243 | struct device *dev = pcc_mbox_ctrl.dev; | |
244 | struct mbox_chan *chan; | |
245 | unsigned long flags; | |
246 | ||
247 | /* | |
248 | * Each PCC Subspace is a Mailbox Channel. | |
249 | * The PCC Clients get their PCC Subspace ID | |
250 | * from their own tables and pass it here. | |
251 | * This returns a pointer to the PCC subspace | |
252 | * for the Client to operate on. | |
253 | */ | |
254 | chan = get_pcc_channel(subspace_id); | |
255 | ||
d311a28a | 256 | if (IS_ERR(chan) || chan->cl) { |
33350e6b | 257 | dev_err(dev, "Channel not found for idx: %d\n", subspace_id); |
86c22f8c AC |
258 | return ERR_PTR(-EBUSY); |
259 | } | |
260 | ||
261 | spin_lock_irqsave(&chan->lock, flags); | |
262 | chan->msg_free = 0; | |
263 | chan->msg_count = 0; | |
264 | chan->active_req = NULL; | |
265 | chan->cl = cl; | |
266 | init_completion(&chan->tx_complete); | |
267 | ||
268 | if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone) | |
269 | chan->txdone_method |= TXDONE_BY_ACK; | |
270 | ||
6ca595a7 HT |
271 | spin_unlock_irqrestore(&chan->lock, flags); |
272 | ||
aca314ef | 273 | if (pcc_doorbell_irq[subspace_id] > 0) { |
274 | int rc; | |
275 | ||
276 | rc = devm_request_irq(dev, pcc_doorbell_irq[subspace_id], | |
277 | pcc_mbox_irq, 0, MBOX_IRQ_NAME, chan); | |
278 | if (unlikely(rc)) { | |
279 | dev_err(dev, "failed to register PCC interrupt %d\n", | |
280 | pcc_doorbell_irq[subspace_id]); | |
6ca595a7 | 281 | pcc_mbox_free_channel(chan); |
aca314ef | 282 | chan = ERR_PTR(rc); |
283 | } | |
284 | } | |
285 | ||
86c22f8c AC |
286 | return chan; |
287 | } | |
288 | EXPORT_SYMBOL_GPL(pcc_mbox_request_channel); | |
289 | ||
290 | /** | |
291 | * pcc_mbox_free_channel - Clients call this to free their Channel. | |
292 | * | |
293 | * @chan: Pointer to the mailbox channel as returned by | |
294 | * pcc_mbox_request_channel() | |
295 | */ | |
296 | void pcc_mbox_free_channel(struct mbox_chan *chan) | |
297 | { | |
aca314ef | 298 | u32 id = chan - pcc_mbox_channels; |
86c22f8c AC |
299 | unsigned long flags; |
300 | ||
301 | if (!chan || !chan->cl) | |
302 | return; | |
303 | ||
aca314ef | 304 | if (id >= pcc_mbox_ctrl.num_chans) { |
305 | pr_debug("pcc_mbox_free_channel: Invalid mbox_chan passed\n"); | |
306 | return; | |
307 | } | |
308 | ||
6ca595a7 HT |
309 | if (pcc_doorbell_irq[id] > 0) |
310 | devm_free_irq(chan->mbox->dev, pcc_doorbell_irq[id], chan); | |
311 | ||
86c22f8c AC |
312 | spin_lock_irqsave(&chan->lock, flags); |
313 | chan->cl = NULL; | |
314 | chan->active_req = NULL; | |
315 | if (chan->txdone_method == (TXDONE_BY_POLL | TXDONE_BY_ACK)) | |
316 | chan->txdone_method = TXDONE_BY_POLL; | |
317 | ||
318 | spin_unlock_irqrestore(&chan->lock, flags); | |
319 | } | |
320 | EXPORT_SYMBOL_GPL(pcc_mbox_free_channel); | |
321 | ||
322 | /** | |
33350e6b AC |
323 | * pcc_send_data - Called from Mailbox Controller code. Used |
324 | * here only to ring the channel doorbell. The PCC client | |
325 | * specific read/write is done in the client driver in | |
326 | * order to maintain atomicity over PCC channel once | |
327 | * OS has control over it. See above for flow of operations. | |
86c22f8c | 328 | * @chan: Pointer to Mailbox channel over which to send data. |
33350e6b AC |
329 | * @data: Client specific data written over channel. Used here |
330 | * only for debug after PCC transaction completes. | |
86c22f8c AC |
331 | * |
332 | * Return: Err if something failed else 0 for success. | |
333 | */ | |
334 | static int pcc_send_data(struct mbox_chan *chan, void *data) | |
335 | { | |
336 | struct acpi_pcct_hw_reduced *pcct_ss = chan->con_priv; | |
8b0f5788 | 337 | struct acpi_generic_address *doorbell; |
86c22f8c AC |
338 | u64 doorbell_preserve; |
339 | u64 doorbell_val; | |
340 | u64 doorbell_write; | |
8b0f5788 PP |
341 | u32 id = chan - pcc_mbox_channels; |
342 | int ret = 0; | |
343 | ||
344 | if (id >= pcc_mbox_ctrl.num_chans) { | |
345 | pr_debug("pcc_send_data: Invalid mbox_chan passed\n"); | |
346 | return -ENOENT; | |
347 | } | |
86c22f8c | 348 | |
8b0f5788 | 349 | doorbell = &pcct_ss->doorbell_register; |
86c22f8c AC |
350 | doorbell_preserve = pcct_ss->preserve_mask; |
351 | doorbell_write = pcct_ss->write_mask; | |
352 | ||
33350e6b | 353 | /* Sync notification from OS to Platform. */ |
8b0f5788 PP |
354 | if (pcc_doorbell_vaddr[id]) { |
355 | ret = read_register(pcc_doorbell_vaddr[id], &doorbell_val, | |
356 | doorbell->bit_width); | |
357 | if (ret) | |
358 | return ret; | |
359 | ret = write_register(pcc_doorbell_vaddr[id], | |
360 | (doorbell_val & doorbell_preserve) | doorbell_write, | |
361 | doorbell->bit_width); | |
362 | } else { | |
363 | ret = acpi_read(&doorbell_val, doorbell); | |
364 | if (ret) | |
365 | return ret; | |
366 | ret = acpi_write((doorbell_val & doorbell_preserve) | doorbell_write, | |
367 | doorbell); | |
368 | } | |
369 | return ret; | |
86c22f8c AC |
370 | } |
371 | ||
05ae7975 | 372 | static const struct mbox_chan_ops pcc_chan_ops = { |
86c22f8c | 373 | .send_data = pcc_send_data, |
86c22f8c AC |
374 | }; |
375 | ||
376 | /** | |
377 | * parse_pcc_subspace - Parse the PCC table and verify PCC subspace | |
378 | * entries. There should be one entry per PCC client. | |
379 | * @header: Pointer to the ACPI subtable header under the PCCT. | |
380 | * @end: End of subtable entry. | |
381 | * | |
382 | * Return: 0 for Success, else errno. | |
383 | * | |
384 | * This gets called for each entry in the PCC table. | |
385 | */ | |
386 | static int parse_pcc_subspace(struct acpi_subtable_header *header, | |
387 | const unsigned long end) | |
388 | { | |
389 | struct acpi_pcct_hw_reduced *pcct_ss; | |
390 | ||
391 | if (pcc_mbox_ctrl.num_chans <= MAX_PCC_SUBSPACES) { | |
392 | pcct_ss = (struct acpi_pcct_hw_reduced *) header; | |
393 | ||
aca314ef | 394 | if ((pcct_ss->header.type != |
395 | ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE) | |
396 | && (pcct_ss->header.type != | |
397 | ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2)) { | |
86c22f8c AC |
398 | pr_err("Incorrect PCC Subspace type detected\n"); |
399 | return -EINVAL; | |
400 | } | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
aca314ef | 406 | /** |
407 | * pcc_parse_subspace_irq - Parse the PCC IRQ and PCC ACK register | |
408 | * There should be one entry per PCC client. | |
409 | * @id: PCC subspace index. | |
410 | * @pcct_ss: Pointer to the ACPI subtable header under the PCCT. | |
411 | * | |
412 | * Return: 0 for Success, else errno. | |
413 | * | |
414 | * This gets called for each entry in the PCC table. | |
415 | */ | |
416 | static int pcc_parse_subspace_irq(int id, | |
417 | struct acpi_pcct_hw_reduced *pcct_ss) | |
418 | { | |
419 | pcc_doorbell_irq[id] = pcc_map_interrupt(pcct_ss->doorbell_interrupt, | |
420 | (u32)pcct_ss->flags); | |
421 | if (pcc_doorbell_irq[id] <= 0) { | |
422 | pr_err("PCC GSI %d not registered\n", | |
423 | pcct_ss->doorbell_interrupt); | |
424 | return -EINVAL; | |
425 | } | |
426 | ||
427 | if (pcct_ss->header.type | |
428 | == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) { | |
429 | struct acpi_pcct_hw_reduced_type2 *pcct2_ss = (void *)pcct_ss; | |
430 | ||
431 | pcc_doorbell_ack_vaddr[id] = acpi_os_ioremap( | |
432 | pcct2_ss->doorbell_ack_register.address, | |
433 | pcct2_ss->doorbell_ack_register.bit_width / 8); | |
434 | if (!pcc_doorbell_ack_vaddr[id]) { | |
435 | pr_err("Failed to ioremap PCC ACK register\n"); | |
436 | return -ENOMEM; | |
437 | } | |
438 | } | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
86c22f8c AC |
443 | /** |
444 | * acpi_pcc_probe - Parse the ACPI tree for the PCCT. | |
445 | * | |
446 | * Return: 0 for Success, else errno. | |
447 | */ | |
448 | static int __init acpi_pcc_probe(void) | |
449 | { | |
86c22f8c AC |
450 | struct acpi_table_header *pcct_tbl; |
451 | struct acpi_subtable_header *pcct_entry; | |
aca314ef | 452 | struct acpi_table_pcct *acpi_pcct_tbl; |
453 | int count, i, rc; | |
454 | int sum = 0; | |
86c22f8c AC |
455 | acpi_status status = AE_OK; |
456 | ||
457 | /* Search for PCCT */ | |
6b11d1d6 | 458 | status = acpi_get_table(ACPI_SIG_PCCT, 0, &pcct_tbl); |
86c22f8c AC |
459 | |
460 | if (ACPI_FAILURE(status) || !pcct_tbl) { | |
461 | pr_warn("PCCT header not found.\n"); | |
462 | return -ENODEV; | |
463 | } | |
464 | ||
465 | count = acpi_table_parse_entries(ACPI_SIG_PCCT, | |
466 | sizeof(struct acpi_table_pcct), | |
467 | ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE, | |
468 | parse_pcc_subspace, MAX_PCC_SUBSPACES); | |
aca314ef | 469 | sum += (count > 0) ? count : 0; |
470 | ||
471 | count = acpi_table_parse_entries(ACPI_SIG_PCCT, | |
472 | sizeof(struct acpi_table_pcct), | |
473 | ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2, | |
474 | parse_pcc_subspace, MAX_PCC_SUBSPACES); | |
475 | sum += (count > 0) ? count : 0; | |
86c22f8c | 476 | |
aca314ef | 477 | if (sum == 0 || sum >= MAX_PCC_SUBSPACES) { |
86c22f8c AC |
478 | pr_err("Error parsing PCC subspaces from PCCT\n"); |
479 | return -EINVAL; | |
480 | } | |
481 | ||
482 | pcc_mbox_channels = kzalloc(sizeof(struct mbox_chan) * | |
aca314ef | 483 | sum, GFP_KERNEL); |
86c22f8c AC |
484 | if (!pcc_mbox_channels) { |
485 | pr_err("Could not allocate space for PCC mbox channels\n"); | |
486 | return -ENOMEM; | |
487 | } | |
488 | ||
aca314ef | 489 | pcc_doorbell_vaddr = kcalloc(sum, sizeof(void *), GFP_KERNEL); |
8b0f5788 | 490 | if (!pcc_doorbell_vaddr) { |
aca314ef | 491 | rc = -ENOMEM; |
492 | goto err_free_mbox; | |
493 | } | |
494 | ||
495 | pcc_doorbell_ack_vaddr = kcalloc(sum, sizeof(void *), GFP_KERNEL); | |
496 | if (!pcc_doorbell_ack_vaddr) { | |
497 | rc = -ENOMEM; | |
498 | goto err_free_db_vaddr; | |
499 | } | |
500 | ||
501 | pcc_doorbell_irq = kcalloc(sum, sizeof(int), GFP_KERNEL); | |
502 | if (!pcc_doorbell_irq) { | |
503 | rc = -ENOMEM; | |
504 | goto err_free_db_ack_vaddr; | |
8b0f5788 PP |
505 | } |
506 | ||
86c22f8c AC |
507 | /* Point to the first PCC subspace entry */ |
508 | pcct_entry = (struct acpi_subtable_header *) ( | |
509 | (unsigned long) pcct_tbl + sizeof(struct acpi_table_pcct)); | |
510 | ||
aca314ef | 511 | acpi_pcct_tbl = (struct acpi_table_pcct *) pcct_tbl; |
512 | if (acpi_pcct_tbl->flags & ACPI_PCCT_DOORBELL) | |
513 | pcc_mbox_ctrl.txdone_irq = true; | |
514 | ||
515 | for (i = 0; i < sum; i++) { | |
8b0f5788 PP |
516 | struct acpi_generic_address *db_reg; |
517 | struct acpi_pcct_hw_reduced *pcct_ss; | |
86c22f8c | 518 | pcc_mbox_channels[i].con_priv = pcct_entry; |
8b0f5788 | 519 | |
aca314ef | 520 | pcct_ss = (struct acpi_pcct_hw_reduced *) pcct_entry; |
521 | ||
522 | if (pcc_mbox_ctrl.txdone_irq) { | |
523 | rc = pcc_parse_subspace_irq(i, pcct_ss); | |
524 | if (rc < 0) | |
525 | goto err; | |
526 | } | |
527 | ||
8b0f5788 | 528 | /* If doorbell is in system memory cache the virt address */ |
8b0f5788 PP |
529 | db_reg = &pcct_ss->doorbell_register; |
530 | if (db_reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) | |
531 | pcc_doorbell_vaddr[i] = acpi_os_ioremap(db_reg->address, | |
532 | db_reg->bit_width/8); | |
86c22f8c AC |
533 | pcct_entry = (struct acpi_subtable_header *) |
534 | ((unsigned long) pcct_entry + pcct_entry->length); | |
535 | } | |
536 | ||
aca314ef | 537 | pcc_mbox_ctrl.num_chans = sum; |
86c22f8c AC |
538 | |
539 | pr_info("Detected %d PCC Subspaces\n", pcc_mbox_ctrl.num_chans); | |
540 | ||
541 | return 0; | |
aca314ef | 542 | |
543 | err: | |
544 | kfree(pcc_doorbell_irq); | |
545 | err_free_db_ack_vaddr: | |
546 | kfree(pcc_doorbell_ack_vaddr); | |
547 | err_free_db_vaddr: | |
548 | kfree(pcc_doorbell_vaddr); | |
549 | err_free_mbox: | |
550 | kfree(pcc_mbox_channels); | |
551 | return rc; | |
86c22f8c AC |
552 | } |
553 | ||
554 | /** | |
555 | * pcc_mbox_probe - Called when we find a match for the | |
556 | * PCCT platform device. This is purely used to represent | |
557 | * the PCCT as a virtual device for registering with the | |
558 | * generic Mailbox framework. | |
559 | * | |
560 | * @pdev: Pointer to platform device returned when a match | |
561 | * is found. | |
562 | * | |
563 | * Return: 0 for Success, else errno. | |
564 | */ | |
565 | static int pcc_mbox_probe(struct platform_device *pdev) | |
566 | { | |
567 | int ret = 0; | |
568 | ||
569 | pcc_mbox_ctrl.chans = pcc_mbox_channels; | |
570 | pcc_mbox_ctrl.ops = &pcc_chan_ops; | |
86c22f8c AC |
571 | pcc_mbox_ctrl.dev = &pdev->dev; |
572 | ||
573 | pr_info("Registering PCC driver as Mailbox controller\n"); | |
574 | ret = mbox_controller_register(&pcc_mbox_ctrl); | |
575 | ||
576 | if (ret) { | |
577 | pr_err("Err registering PCC as Mailbox controller: %d\n", ret); | |
578 | ret = -ENODEV; | |
579 | } | |
580 | ||
581 | return ret; | |
582 | } | |
583 | ||
584 | struct platform_driver pcc_mbox_driver = { | |
585 | .probe = pcc_mbox_probe, | |
586 | .driver = { | |
587 | .name = "PCCT", | |
588 | .owner = THIS_MODULE, | |
589 | }, | |
590 | }; | |
591 | ||
592 | static int __init pcc_init(void) | |
593 | { | |
594 | int ret; | |
595 | struct platform_device *pcc_pdev; | |
596 | ||
597 | if (acpi_disabled) | |
598 | return -ENODEV; | |
599 | ||
600 | /* Check if PCC support is available. */ | |
601 | ret = acpi_pcc_probe(); | |
602 | ||
603 | if (ret) { | |
efd756da | 604 | pr_debug("ACPI PCC probe failed.\n"); |
86c22f8c AC |
605 | return -ENODEV; |
606 | } | |
607 | ||
608 | pcc_pdev = platform_create_bundle(&pcc_mbox_driver, | |
609 | pcc_mbox_probe, NULL, 0, NULL, 0); | |
610 | ||
356d5d28 | 611 | if (IS_ERR(pcc_pdev)) { |
efd756da | 612 | pr_debug("Err creating PCC platform bundle\n"); |
356d5d28 | 613 | return PTR_ERR(pcc_pdev); |
86c22f8c AC |
614 | } |
615 | ||
616 | return 0; | |
617 | } | |
d3c68f21 AC |
618 | |
619 | /* | |
620 | * Make PCC init postcore so that users of this mailbox | |
621 | * such as the ACPI Processor driver have it available | |
622 | * at their init. | |
623 | */ | |
624 | postcore_initcall(pcc_init); |