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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
86c22f8c AC |
2 | /* |
3 | * Copyright (C) 2014 Linaro Ltd. | |
4 | * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org> | |
5 | * | |
86c22f8c AC |
6 | * PCC (Platform Communication Channel) is defined in the ACPI 5.0+ |
7 | * specification. It is a mailbox like mechanism to allow clients | |
8 | * such as CPPC (Collaborative Processor Performance Control), RAS | |
9 | * (Reliability, Availability and Serviceability) and MPST (Memory | |
10 | * Node Power State Table) to talk to the platform (e.g. BMC) through | |
11 | * shared memory regions as defined in the PCC table entries. The PCC | |
12 | * specification supports a Doorbell mechanism for the PCC clients | |
13 | * to notify the platform about new data. This Doorbell information | |
33350e6b | 14 | * is also specified in each PCC table entry. |
86c22f8c | 15 | * |
33350e6b AC |
16 | * Typical high level flow of operation is: |
17 | * | |
18 | * PCC Reads: | |
19 | * * Client tries to acquire a channel lock. | |
20 | * * After it is acquired it writes READ cmd in communication region cmd | |
21 | * address. | |
22 | * * Client issues mbox_send_message() which rings the PCC doorbell | |
23 | * for its PCC channel. | |
24 | * * If command completes, then client has control over channel and | |
25 | * it can proceed with its reads. | |
26 | * * Client releases lock. | |
27 | * | |
28 | * PCC Writes: | |
29 | * * Client tries to acquire channel lock. | |
30 | * * Client writes to its communication region after it acquires a | |
31 | * channel lock. | |
32 | * * Client writes WRITE cmd in communication region cmd address. | |
33 | * * Client issues mbox_send_message() which rings the PCC doorbell | |
34 | * for its PCC channel. | |
35 | * * If command completes, then writes have succeded and it can release | |
36 | * the channel lock. | |
37 | * | |
38 | * There is a Nominal latency defined for each channel which indicates | |
39 | * how long to wait until a command completes. If command is not complete | |
40 | * the client needs to retry or assume failure. | |
41 | * | |
42 | * For more details about PCC, please see the ACPI specification from | |
86c22f8c AC |
43 | * http://www.uefi.org/ACPIv5.1 Section 14. |
44 | * | |
45 | * This file implements PCC as a Mailbox controller and allows for PCC | |
46 | * clients to be implemented as its Mailbox Client Channels. | |
47 | */ | |
48 | ||
49 | #include <linux/acpi.h> | |
50 | #include <linux/delay.h> | |
51 | #include <linux/io.h> | |
52 | #include <linux/init.h> | |
aca314ef | 53 | #include <linux/interrupt.h> |
86c22f8c AC |
54 | #include <linux/list.h> |
55 | #include <linux/platform_device.h> | |
56 | #include <linux/mailbox_controller.h> | |
57 | #include <linux/mailbox_client.h> | |
8b0f5788 | 58 | #include <linux/io-64-nonatomic-lo-hi.h> |
6ca595a7 | 59 | #include <acpi/pcc.h> |
86c22f8c AC |
60 | |
61 | #include "mailbox.h" | |
62 | ||
aca314ef | 63 | #define MBOX_IRQ_NAME "pcc-mbox" |
86c22f8c AC |
64 | |
65 | static struct mbox_chan *pcc_mbox_channels; | |
66 | ||
8b0f5788 PP |
67 | /* Array of cached virtual address for doorbell registers */ |
68 | static void __iomem **pcc_doorbell_vaddr; | |
aca314ef | 69 | /* Array of cached virtual address for doorbell ack registers */ |
70 | static void __iomem **pcc_doorbell_ack_vaddr; | |
71 | /* Array of doorbell interrupts */ | |
72 | static int *pcc_doorbell_irq; | |
8b0f5788 | 73 | |
86c22f8c AC |
74 | static struct mbox_controller pcc_mbox_ctrl = {}; |
75 | /** | |
76 | * get_pcc_channel - Given a PCC subspace idx, get | |
77 | * the respective mbox_channel. | |
78 | * @id: PCC subspace index. | |
79 | * | |
80 | * Return: ERR_PTR(errno) if error, else pointer | |
81 | * to mbox channel. | |
82 | */ | |
83 | static struct mbox_chan *get_pcc_channel(int id) | |
84 | { | |
ecfc1599 | 85 | if (id < 0 || id >= pcc_mbox_ctrl.num_chans) |
86c22f8c AC |
86 | return ERR_PTR(-ENOENT); |
87 | ||
e9c8dc8b | 88 | return &pcc_mbox_channels[id]; |
86c22f8c AC |
89 | } |
90 | ||
aca314ef | 91 | /* |
92 | * PCC can be used with perf critical drivers such as CPPC | |
93 | * So it makes sense to locally cache the virtual address and | |
94 | * use it to read/write to PCC registers such as doorbell register | |
95 | * | |
96 | * The below read_register and write_registers are used to read and | |
97 | * write from perf critical registers such as PCC doorbell register | |
98 | */ | |
99 | static int read_register(void __iomem *vaddr, u64 *val, unsigned int bit_width) | |
100 | { | |
101 | int ret_val = 0; | |
102 | ||
103 | switch (bit_width) { | |
104 | case 8: | |
105 | *val = readb(vaddr); | |
106 | break; | |
107 | case 16: | |
108 | *val = readw(vaddr); | |
109 | break; | |
110 | case 32: | |
111 | *val = readl(vaddr); | |
112 | break; | |
113 | case 64: | |
114 | *val = readq(vaddr); | |
115 | break; | |
116 | default: | |
117 | pr_debug("Error: Cannot read register of %u bit width", | |
118 | bit_width); | |
119 | ret_val = -EFAULT; | |
120 | break; | |
121 | } | |
122 | return ret_val; | |
123 | } | |
124 | ||
125 | static int write_register(void __iomem *vaddr, u64 val, unsigned int bit_width) | |
126 | { | |
127 | int ret_val = 0; | |
128 | ||
129 | switch (bit_width) { | |
130 | case 8: | |
131 | writeb(val, vaddr); | |
132 | break; | |
133 | case 16: | |
134 | writew(val, vaddr); | |
135 | break; | |
136 | case 32: | |
137 | writel(val, vaddr); | |
138 | break; | |
139 | case 64: | |
140 | writeq(val, vaddr); | |
141 | break; | |
142 | default: | |
143 | pr_debug("Error: Cannot write register of %u bit width", | |
144 | bit_width); | |
145 | ret_val = -EFAULT; | |
146 | break; | |
147 | } | |
148 | return ret_val; | |
149 | } | |
150 | ||
151 | /** | |
152 | * pcc_map_interrupt - Map a PCC subspace GSI to a linux IRQ number | |
153 | * @interrupt: GSI number. | |
154 | * @flags: interrupt flags | |
155 | * | |
156 | * Returns: a valid linux IRQ number on success | |
157 | * 0 or -EINVAL on failure | |
158 | */ | |
159 | static int pcc_map_interrupt(u32 interrupt, u32 flags) | |
160 | { | |
161 | int trigger, polarity; | |
162 | ||
163 | if (!interrupt) | |
164 | return 0; | |
165 | ||
166 | trigger = (flags & ACPI_PCCT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE | |
167 | : ACPI_LEVEL_SENSITIVE; | |
168 | ||
169 | polarity = (flags & ACPI_PCCT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW | |
170 | : ACPI_ACTIVE_HIGH; | |
171 | ||
172 | return acpi_register_gsi(NULL, interrupt, trigger, polarity); | |
173 | } | |
174 | ||
175 | /** | |
176 | * pcc_mbox_irq - PCC mailbox interrupt handler | |
177 | */ | |
178 | static irqreturn_t pcc_mbox_irq(int irq, void *p) | |
179 | { | |
180 | struct acpi_generic_address *doorbell_ack; | |
181 | struct acpi_pcct_hw_reduced *pcct_ss; | |
182 | struct mbox_chan *chan = p; | |
183 | u64 doorbell_ack_preserve; | |
184 | u64 doorbell_ack_write; | |
185 | u64 doorbell_ack_val; | |
186 | int ret; | |
187 | ||
188 | pcct_ss = chan->con_priv; | |
189 | ||
190 | mbox_chan_received_data(chan, NULL); | |
191 | ||
192 | if (pcct_ss->header.type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) { | |
193 | struct acpi_pcct_hw_reduced_type2 *pcct2_ss = chan->con_priv; | |
194 | u32 id = chan - pcc_mbox_channels; | |
195 | ||
c7a1dfb9 | 196 | doorbell_ack = &pcct2_ss->platform_ack_register; |
aca314ef | 197 | doorbell_ack_preserve = pcct2_ss->ack_preserve_mask; |
198 | doorbell_ack_write = pcct2_ss->ack_write_mask; | |
199 | ||
200 | ret = read_register(pcc_doorbell_ack_vaddr[id], | |
201 | &doorbell_ack_val, | |
202 | doorbell_ack->bit_width); | |
203 | if (ret) | |
204 | return IRQ_NONE; | |
205 | ||
206 | ret = write_register(pcc_doorbell_ack_vaddr[id], | |
207 | (doorbell_ack_val & doorbell_ack_preserve) | |
208 | | doorbell_ack_write, | |
209 | doorbell_ack->bit_width); | |
210 | if (ret) | |
211 | return IRQ_NONE; | |
212 | } | |
213 | ||
214 | return IRQ_HANDLED; | |
215 | } | |
216 | ||
86c22f8c AC |
217 | /** |
218 | * pcc_mbox_request_channel - PCC clients call this function to | |
219 | * request a pointer to their PCC subspace, from which they | |
220 | * can get the details of communicating with the remote. | |
221 | * @cl: Pointer to Mailbox client, so we know where to bind the | |
222 | * Channel. | |
223 | * @subspace_id: The PCC Subspace index as parsed in the PCC client | |
224 | * ACPI package. This is used to lookup the array of PCC | |
225 | * subspaces as parsed by the PCC Mailbox controller. | |
226 | * | |
227 | * Return: Pointer to the Mailbox Channel if successful or | |
228 | * ERR_PTR. | |
229 | */ | |
230 | struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl, | |
231 | int subspace_id) | |
232 | { | |
233 | struct device *dev = pcc_mbox_ctrl.dev; | |
234 | struct mbox_chan *chan; | |
235 | unsigned long flags; | |
236 | ||
237 | /* | |
238 | * Each PCC Subspace is a Mailbox Channel. | |
239 | * The PCC Clients get their PCC Subspace ID | |
240 | * from their own tables and pass it here. | |
241 | * This returns a pointer to the PCC subspace | |
242 | * for the Client to operate on. | |
243 | */ | |
244 | chan = get_pcc_channel(subspace_id); | |
245 | ||
d311a28a | 246 | if (IS_ERR(chan) || chan->cl) { |
33350e6b | 247 | dev_err(dev, "Channel not found for idx: %d\n", subspace_id); |
86c22f8c AC |
248 | return ERR_PTR(-EBUSY); |
249 | } | |
250 | ||
251 | spin_lock_irqsave(&chan->lock, flags); | |
252 | chan->msg_free = 0; | |
253 | chan->msg_count = 0; | |
254 | chan->active_req = NULL; | |
255 | chan->cl = cl; | |
256 | init_completion(&chan->tx_complete); | |
257 | ||
258 | if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone) | |
33cd7123 | 259 | chan->txdone_method = TXDONE_BY_ACK; |
86c22f8c | 260 | |
6ca595a7 HT |
261 | spin_unlock_irqrestore(&chan->lock, flags); |
262 | ||
aca314ef | 263 | if (pcc_doorbell_irq[subspace_id] > 0) { |
264 | int rc; | |
265 | ||
266 | rc = devm_request_irq(dev, pcc_doorbell_irq[subspace_id], | |
267 | pcc_mbox_irq, 0, MBOX_IRQ_NAME, chan); | |
268 | if (unlikely(rc)) { | |
269 | dev_err(dev, "failed to register PCC interrupt %d\n", | |
270 | pcc_doorbell_irq[subspace_id]); | |
6ca595a7 | 271 | pcc_mbox_free_channel(chan); |
aca314ef | 272 | chan = ERR_PTR(rc); |
273 | } | |
274 | } | |
275 | ||
86c22f8c AC |
276 | return chan; |
277 | } | |
278 | EXPORT_SYMBOL_GPL(pcc_mbox_request_channel); | |
279 | ||
280 | /** | |
281 | * pcc_mbox_free_channel - Clients call this to free their Channel. | |
282 | * | |
283 | * @chan: Pointer to the mailbox channel as returned by | |
284 | * pcc_mbox_request_channel() | |
285 | */ | |
286 | void pcc_mbox_free_channel(struct mbox_chan *chan) | |
287 | { | |
aca314ef | 288 | u32 id = chan - pcc_mbox_channels; |
86c22f8c AC |
289 | unsigned long flags; |
290 | ||
291 | if (!chan || !chan->cl) | |
292 | return; | |
293 | ||
aca314ef | 294 | if (id >= pcc_mbox_ctrl.num_chans) { |
295 | pr_debug("pcc_mbox_free_channel: Invalid mbox_chan passed\n"); | |
296 | return; | |
297 | } | |
298 | ||
6ca595a7 HT |
299 | if (pcc_doorbell_irq[id] > 0) |
300 | devm_free_irq(chan->mbox->dev, pcc_doorbell_irq[id], chan); | |
301 | ||
86c22f8c AC |
302 | spin_lock_irqsave(&chan->lock, flags); |
303 | chan->cl = NULL; | |
304 | chan->active_req = NULL; | |
33cd7123 | 305 | if (chan->txdone_method == TXDONE_BY_ACK) |
86c22f8c AC |
306 | chan->txdone_method = TXDONE_BY_POLL; |
307 | ||
308 | spin_unlock_irqrestore(&chan->lock, flags); | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(pcc_mbox_free_channel); | |
311 | ||
312 | /** | |
33350e6b AC |
313 | * pcc_send_data - Called from Mailbox Controller code. Used |
314 | * here only to ring the channel doorbell. The PCC client | |
315 | * specific read/write is done in the client driver in | |
316 | * order to maintain atomicity over PCC channel once | |
317 | * OS has control over it. See above for flow of operations. | |
86c22f8c | 318 | * @chan: Pointer to Mailbox channel over which to send data. |
33350e6b AC |
319 | * @data: Client specific data written over channel. Used here |
320 | * only for debug after PCC transaction completes. | |
86c22f8c AC |
321 | * |
322 | * Return: Err if something failed else 0 for success. | |
323 | */ | |
324 | static int pcc_send_data(struct mbox_chan *chan, void *data) | |
325 | { | |
326 | struct acpi_pcct_hw_reduced *pcct_ss = chan->con_priv; | |
8b0f5788 | 327 | struct acpi_generic_address *doorbell; |
86c22f8c AC |
328 | u64 doorbell_preserve; |
329 | u64 doorbell_val; | |
330 | u64 doorbell_write; | |
8b0f5788 PP |
331 | u32 id = chan - pcc_mbox_channels; |
332 | int ret = 0; | |
333 | ||
334 | if (id >= pcc_mbox_ctrl.num_chans) { | |
335 | pr_debug("pcc_send_data: Invalid mbox_chan passed\n"); | |
336 | return -ENOENT; | |
337 | } | |
86c22f8c | 338 | |
8b0f5788 | 339 | doorbell = &pcct_ss->doorbell_register; |
86c22f8c AC |
340 | doorbell_preserve = pcct_ss->preserve_mask; |
341 | doorbell_write = pcct_ss->write_mask; | |
342 | ||
33350e6b | 343 | /* Sync notification from OS to Platform. */ |
8b0f5788 PP |
344 | if (pcc_doorbell_vaddr[id]) { |
345 | ret = read_register(pcc_doorbell_vaddr[id], &doorbell_val, | |
346 | doorbell->bit_width); | |
347 | if (ret) | |
348 | return ret; | |
349 | ret = write_register(pcc_doorbell_vaddr[id], | |
350 | (doorbell_val & doorbell_preserve) | doorbell_write, | |
351 | doorbell->bit_width); | |
352 | } else { | |
353 | ret = acpi_read(&doorbell_val, doorbell); | |
354 | if (ret) | |
355 | return ret; | |
356 | ret = acpi_write((doorbell_val & doorbell_preserve) | doorbell_write, | |
357 | doorbell); | |
358 | } | |
359 | return ret; | |
86c22f8c AC |
360 | } |
361 | ||
05ae7975 | 362 | static const struct mbox_chan_ops pcc_chan_ops = { |
86c22f8c | 363 | .send_data = pcc_send_data, |
86c22f8c AC |
364 | }; |
365 | ||
366 | /** | |
8f8027c5 | 367 | * parse_pcc_subspaces -- Count PCC subspaces defined |
86c22f8c AC |
368 | * @header: Pointer to the ACPI subtable header under the PCCT. |
369 | * @end: End of subtable entry. | |
370 | * | |
8f8027c5 AS |
371 | * Return: If we find a PCC subspace entry of a valid type, return 0. |
372 | * Otherwise, return -EINVAL. | |
86c22f8c AC |
373 | * |
374 | * This gets called for each entry in the PCC table. | |
375 | */ | |
60574d1e | 376 | static int parse_pcc_subspace(union acpi_subtable_headers *header, |
86c22f8c AC |
377 | const unsigned long end) |
378 | { | |
8f8027c5 | 379 | struct acpi_pcct_subspace *ss = (struct acpi_pcct_subspace *) header; |
86c22f8c | 380 | |
8f8027c5 AS |
381 | if (ss->header.type < ACPI_PCCT_TYPE_RESERVED) |
382 | return 0; | |
86c22f8c | 383 | |
8f8027c5 | 384 | return -EINVAL; |
86c22f8c AC |
385 | } |
386 | ||
aca314ef | 387 | /** |
388 | * pcc_parse_subspace_irq - Parse the PCC IRQ and PCC ACK register | |
389 | * There should be one entry per PCC client. | |
390 | * @id: PCC subspace index. | |
391 | * @pcct_ss: Pointer to the ACPI subtable header under the PCCT. | |
392 | * | |
393 | * Return: 0 for Success, else errno. | |
394 | * | |
395 | * This gets called for each entry in the PCC table. | |
396 | */ | |
397 | static int pcc_parse_subspace_irq(int id, | |
398 | struct acpi_pcct_hw_reduced *pcct_ss) | |
399 | { | |
c7a1dfb9 | 400 | pcc_doorbell_irq[id] = pcc_map_interrupt(pcct_ss->platform_interrupt, |
aca314ef | 401 | (u32)pcct_ss->flags); |
402 | if (pcc_doorbell_irq[id] <= 0) { | |
403 | pr_err("PCC GSI %d not registered\n", | |
c7a1dfb9 | 404 | pcct_ss->platform_interrupt); |
aca314ef | 405 | return -EINVAL; |
406 | } | |
407 | ||
408 | if (pcct_ss->header.type | |
409 | == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) { | |
410 | struct acpi_pcct_hw_reduced_type2 *pcct2_ss = (void *)pcct_ss; | |
411 | ||
412 | pcc_doorbell_ack_vaddr[id] = acpi_os_ioremap( | |
c7a1dfb9 DB |
413 | pcct2_ss->platform_ack_register.address, |
414 | pcct2_ss->platform_ack_register.bit_width / 8); | |
aca314ef | 415 | if (!pcc_doorbell_ack_vaddr[id]) { |
416 | pr_err("Failed to ioremap PCC ACK register\n"); | |
417 | return -ENOMEM; | |
418 | } | |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
86c22f8c AC |
424 | /** |
425 | * acpi_pcc_probe - Parse the ACPI tree for the PCCT. | |
426 | * | |
427 | * Return: 0 for Success, else errno. | |
428 | */ | |
429 | static int __init acpi_pcc_probe(void) | |
430 | { | |
86c22f8c AC |
431 | struct acpi_table_header *pcct_tbl; |
432 | struct acpi_subtable_header *pcct_entry; | |
aca314ef | 433 | struct acpi_table_pcct *acpi_pcct_tbl; |
8f8027c5 | 434 | struct acpi_subtable_proc proc[ACPI_PCCT_TYPE_RESERVED]; |
aca314ef | 435 | int count, i, rc; |
86c22f8c AC |
436 | acpi_status status = AE_OK; |
437 | ||
438 | /* Search for PCCT */ | |
6b11d1d6 | 439 | status = acpi_get_table(ACPI_SIG_PCCT, 0, &pcct_tbl); |
86c22f8c | 440 | |
66ed4cac | 441 | if (ACPI_FAILURE(status) || !pcct_tbl) |
86c22f8c | 442 | return -ENODEV; |
86c22f8c | 443 | |
8f8027c5 AS |
444 | /* Set up the subtable handlers */ |
445 | for (i = ACPI_PCCT_TYPE_GENERIC_SUBSPACE; | |
446 | i < ACPI_PCCT_TYPE_RESERVED; i++) { | |
447 | proc[i].id = i; | |
448 | proc[i].count = 0; | |
449 | proc[i].handler = parse_pcc_subspace; | |
450 | } | |
86c22f8c | 451 | |
8f8027c5 AS |
452 | count = acpi_table_parse_entries_array(ACPI_SIG_PCCT, |
453 | sizeof(struct acpi_table_pcct), proc, | |
454 | ACPI_PCCT_TYPE_RESERVED, MAX_PCC_SUBSPACES); | |
afd0b1fb DA |
455 | if (count <= 0 || count > MAX_PCC_SUBSPACES) { |
456 | if (count < 0) | |
457 | pr_warn("Error parsing PCC subspaces from PCCT\n"); | |
458 | else | |
459 | pr_warn("Invalid PCCT: %d PCC subspaces\n", count); | |
425ab036 HG |
460 | |
461 | rc = -EINVAL; | |
462 | goto err_put_pcct; | |
86c22f8c AC |
463 | } |
464 | ||
6396bb22 KC |
465 | pcc_mbox_channels = kcalloc(count, sizeof(struct mbox_chan), |
466 | GFP_KERNEL); | |
86c22f8c AC |
467 | if (!pcc_mbox_channels) { |
468 | pr_err("Could not allocate space for PCC mbox channels\n"); | |
425ab036 HG |
469 | rc = -ENOMEM; |
470 | goto err_put_pcct; | |
86c22f8c AC |
471 | } |
472 | ||
8f8027c5 | 473 | pcc_doorbell_vaddr = kcalloc(count, sizeof(void *), GFP_KERNEL); |
8b0f5788 | 474 | if (!pcc_doorbell_vaddr) { |
aca314ef | 475 | rc = -ENOMEM; |
476 | goto err_free_mbox; | |
477 | } | |
478 | ||
8f8027c5 | 479 | pcc_doorbell_ack_vaddr = kcalloc(count, sizeof(void *), GFP_KERNEL); |
aca314ef | 480 | if (!pcc_doorbell_ack_vaddr) { |
481 | rc = -ENOMEM; | |
482 | goto err_free_db_vaddr; | |
483 | } | |
484 | ||
8f8027c5 | 485 | pcc_doorbell_irq = kcalloc(count, sizeof(int), GFP_KERNEL); |
aca314ef | 486 | if (!pcc_doorbell_irq) { |
487 | rc = -ENOMEM; | |
488 | goto err_free_db_ack_vaddr; | |
8b0f5788 PP |
489 | } |
490 | ||
86c22f8c AC |
491 | /* Point to the first PCC subspace entry */ |
492 | pcct_entry = (struct acpi_subtable_header *) ( | |
493 | (unsigned long) pcct_tbl + sizeof(struct acpi_table_pcct)); | |
494 | ||
aca314ef | 495 | acpi_pcct_tbl = (struct acpi_table_pcct *) pcct_tbl; |
496 | if (acpi_pcct_tbl->flags & ACPI_PCCT_DOORBELL) | |
497 | pcc_mbox_ctrl.txdone_irq = true; | |
498 | ||
8f8027c5 | 499 | for (i = 0; i < count; i++) { |
8b0f5788 | 500 | struct acpi_generic_address *db_reg; |
8f8027c5 | 501 | struct acpi_pcct_subspace *pcct_ss; |
86c22f8c | 502 | pcc_mbox_channels[i].con_priv = pcct_entry; |
8b0f5788 | 503 | |
8f8027c5 AS |
504 | if (pcct_entry->type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE || |
505 | pcct_entry->type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) { | |
506 | struct acpi_pcct_hw_reduced *pcct_hrss; | |
507 | ||
508 | pcct_hrss = (struct acpi_pcct_hw_reduced *) pcct_entry; | |
aca314ef | 509 | |
8f8027c5 AS |
510 | if (pcc_mbox_ctrl.txdone_irq) { |
511 | rc = pcc_parse_subspace_irq(i, pcct_hrss); | |
512 | if (rc < 0) | |
513 | goto err; | |
514 | } | |
aca314ef | 515 | } |
8f8027c5 | 516 | pcct_ss = (struct acpi_pcct_subspace *) pcct_entry; |
aca314ef | 517 | |
8b0f5788 | 518 | /* If doorbell is in system memory cache the virt address */ |
8b0f5788 PP |
519 | db_reg = &pcct_ss->doorbell_register; |
520 | if (db_reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) | |
521 | pcc_doorbell_vaddr[i] = acpi_os_ioremap(db_reg->address, | |
522 | db_reg->bit_width/8); | |
86c22f8c AC |
523 | pcct_entry = (struct acpi_subtable_header *) |
524 | ((unsigned long) pcct_entry + pcct_entry->length); | |
525 | } | |
526 | ||
8f8027c5 | 527 | pcc_mbox_ctrl.num_chans = count; |
86c22f8c AC |
528 | |
529 | pr_info("Detected %d PCC Subspaces\n", pcc_mbox_ctrl.num_chans); | |
530 | ||
531 | return 0; | |
aca314ef | 532 | |
533 | err: | |
534 | kfree(pcc_doorbell_irq); | |
535 | err_free_db_ack_vaddr: | |
536 | kfree(pcc_doorbell_ack_vaddr); | |
537 | err_free_db_vaddr: | |
538 | kfree(pcc_doorbell_vaddr); | |
539 | err_free_mbox: | |
540 | kfree(pcc_mbox_channels); | |
425ab036 HG |
541 | err_put_pcct: |
542 | acpi_put_table(pcct_tbl); | |
aca314ef | 543 | return rc; |
86c22f8c AC |
544 | } |
545 | ||
546 | /** | |
547 | * pcc_mbox_probe - Called when we find a match for the | |
548 | * PCCT platform device. This is purely used to represent | |
549 | * the PCCT as a virtual device for registering with the | |
550 | * generic Mailbox framework. | |
551 | * | |
552 | * @pdev: Pointer to platform device returned when a match | |
553 | * is found. | |
554 | * | |
555 | * Return: 0 for Success, else errno. | |
556 | */ | |
557 | static int pcc_mbox_probe(struct platform_device *pdev) | |
558 | { | |
559 | int ret = 0; | |
560 | ||
561 | pcc_mbox_ctrl.chans = pcc_mbox_channels; | |
562 | pcc_mbox_ctrl.ops = &pcc_chan_ops; | |
86c22f8c AC |
563 | pcc_mbox_ctrl.dev = &pdev->dev; |
564 | ||
565 | pr_info("Registering PCC driver as Mailbox controller\n"); | |
566 | ret = mbox_controller_register(&pcc_mbox_ctrl); | |
567 | ||
568 | if (ret) { | |
569 | pr_err("Err registering PCC as Mailbox controller: %d\n", ret); | |
570 | ret = -ENODEV; | |
571 | } | |
572 | ||
573 | return ret; | |
574 | } | |
575 | ||
00d9990a | 576 | static struct platform_driver pcc_mbox_driver = { |
86c22f8c AC |
577 | .probe = pcc_mbox_probe, |
578 | .driver = { | |
579 | .name = "PCCT", | |
580 | .owner = THIS_MODULE, | |
581 | }, | |
582 | }; | |
583 | ||
584 | static int __init pcc_init(void) | |
585 | { | |
586 | int ret; | |
587 | struct platform_device *pcc_pdev; | |
588 | ||
589 | if (acpi_disabled) | |
590 | return -ENODEV; | |
591 | ||
592 | /* Check if PCC support is available. */ | |
593 | ret = acpi_pcc_probe(); | |
594 | ||
595 | if (ret) { | |
efd756da | 596 | pr_debug("ACPI PCC probe failed.\n"); |
86c22f8c AC |
597 | return -ENODEV; |
598 | } | |
599 | ||
600 | pcc_pdev = platform_create_bundle(&pcc_mbox_driver, | |
601 | pcc_mbox_probe, NULL, 0, NULL, 0); | |
602 | ||
356d5d28 | 603 | if (IS_ERR(pcc_pdev)) { |
efd756da | 604 | pr_debug("Err creating PCC platform bundle\n"); |
356d5d28 | 605 | return PTR_ERR(pcc_pdev); |
86c22f8c AC |
606 | } |
607 | ||
608 | return 0; | |
609 | } | |
d3c68f21 AC |
610 | |
611 | /* | |
612 | * Make PCC init postcore so that users of this mailbox | |
613 | * such as the ACPI Processor driver have it available | |
614 | * at their init. | |
615 | */ | |
616 | postcore_initcall(pcc_init); |