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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Xilinx Inter Processor Interrupt(IPI) Mailbox Driver | |
4 | * | |
5 | * Copyright (C) 2018 Xilinx, Inc. | |
6 | */ | |
7 | ||
8 | #include <linux/arm-smccc.h> | |
9 | #include <linux/delay.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/mailbox_controller.h> | |
15 | #include <linux/mailbox/zynqmp-ipi-message.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/of.h> | |
18 | #include <linux/of_address.h> | |
19 | #include <linux/of_device.h> | |
20 | #include <linux/of_irq.h> | |
21 | #include <linux/platform_device.h> | |
22 | ||
23 | /* IPI agent ID any */ | |
24 | #define IPI_ID_ANY 0xFFUL | |
25 | ||
26 | /* indicate if ZynqMP IPI mailbox driver uses SMC calls or HVC calls */ | |
27 | #define USE_SMC 0 | |
28 | #define USE_HVC 1 | |
29 | ||
30 | /* Default IPI SMC function IDs */ | |
31 | #define SMC_IPI_MAILBOX_OPEN 0x82001000U | |
32 | #define SMC_IPI_MAILBOX_RELEASE 0x82001001U | |
33 | #define SMC_IPI_MAILBOX_STATUS_ENQUIRY 0x82001002U | |
34 | #define SMC_IPI_MAILBOX_NOTIFY 0x82001003U | |
35 | #define SMC_IPI_MAILBOX_ACK 0x82001004U | |
36 | #define SMC_IPI_MAILBOX_ENABLE_IRQ 0x82001005U | |
37 | #define SMC_IPI_MAILBOX_DISABLE_IRQ 0x82001006U | |
38 | ||
39 | /* IPI SMC Macros */ | |
40 | #define IPI_SMC_ENQUIRY_DIRQ_MASK 0x00000001UL /* Flag to indicate if | |
41 | * notification interrupt | |
42 | * to be disabled. | |
43 | */ | |
44 | #define IPI_SMC_ACK_EIRQ_MASK 0x00000001UL /* Flag to indicate if | |
45 | * notification interrupt | |
46 | * to be enabled. | |
47 | */ | |
48 | ||
49 | /* IPI mailbox status */ | |
50 | #define IPI_MB_STATUS_IDLE 0 | |
51 | #define IPI_MB_STATUS_SEND_PENDING 1 | |
52 | #define IPI_MB_STATUS_RECV_PENDING 2 | |
53 | ||
54 | #define IPI_MB_CHNL_TX 0 /* IPI mailbox TX channel */ | |
55 | #define IPI_MB_CHNL_RX 1 /* IPI mailbox RX channel */ | |
56 | ||
57 | /** | |
58 | * struct zynqmp_ipi_mchan - Description of a Xilinx ZynqMP IPI mailbox channel | |
59 | * @is_opened: indicate if the IPI channel is opened | |
60 | * @req_buf: local to remote request buffer start address | |
61 | * @resp_buf: local to remote response buffer start address | |
62 | * @req_buf_size: request buffer size | |
63 | * @resp_buf_size: response buffer size | |
64 | * @rx_buf: receive buffer to pass received message to client | |
65 | * @chan_type: channel type | |
66 | */ | |
67 | struct zynqmp_ipi_mchan { | |
68 | int is_opened; | |
69 | void __iomem *req_buf; | |
70 | void __iomem *resp_buf; | |
71 | void *rx_buf; | |
72 | size_t req_buf_size; | |
73 | size_t resp_buf_size; | |
74 | unsigned int chan_type; | |
75 | }; | |
76 | ||
77 | /** | |
78 | * struct zynqmp_ipi_mbox - Description of a ZynqMP IPI mailbox | |
79 | * platform data. | |
80 | * @pdata: pointer to the IPI private data | |
81 | * @dev: device pointer corresponding to the Xilinx ZynqMP | |
82 | * IPI mailbox | |
83 | * @remote_id: remote IPI agent ID | |
84 | * @mbox: mailbox Controller | |
85 | * @mchans: array for channels, tx channel and rx channel. | |
86 | * @irq: IPI agent interrupt ID | |
87 | */ | |
88 | struct zynqmp_ipi_mbox { | |
89 | struct zynqmp_ipi_pdata *pdata; | |
90 | struct device dev; | |
91 | u32 remote_id; | |
92 | struct mbox_controller mbox; | |
93 | struct zynqmp_ipi_mchan mchans[2]; | |
94 | }; | |
95 | ||
96 | /** | |
97 | * struct zynqmp_ipi_pdata - Description of z ZynqMP IPI agent platform data. | |
98 | * | |
99 | * @dev: device pointer corresponding to the Xilinx ZynqMP | |
100 | * IPI agent | |
101 | * @irq: IPI agent interrupt ID | |
102 | * @method: IPI SMC or HVC is going to be used | |
103 | * @local_id: local IPI agent ID | |
104 | * @num_mboxes: number of mailboxes of this IPI agent | |
105 | * @ipi_mboxes: IPI mailboxes of this IPI agent | |
106 | */ | |
107 | struct zynqmp_ipi_pdata { | |
108 | struct device *dev; | |
109 | int irq; | |
110 | unsigned int method; | |
111 | u32 local_id; | |
112 | int num_mboxes; | |
113 | struct zynqmp_ipi_mbox *ipi_mboxes; | |
114 | }; | |
115 | ||
116 | static struct device_driver zynqmp_ipi_mbox_driver = { | |
117 | .owner = THIS_MODULE, | |
118 | .name = "zynqmp-ipi-mbox", | |
119 | }; | |
120 | ||
121 | static void zynqmp_ipi_fw_call(struct zynqmp_ipi_mbox *ipi_mbox, | |
122 | unsigned long a0, unsigned long a3, | |
123 | struct arm_smccc_res *res) | |
124 | { | |
125 | struct zynqmp_ipi_pdata *pdata = ipi_mbox->pdata; | |
126 | unsigned long a1, a2; | |
127 | ||
128 | a1 = pdata->local_id; | |
129 | a2 = ipi_mbox->remote_id; | |
130 | if (pdata->method == USE_SMC) | |
131 | arm_smccc_smc(a0, a1, a2, a3, 0, 0, 0, 0, res); | |
132 | else | |
133 | arm_smccc_hvc(a0, a1, a2, a3, 0, 0, 0, 0, res); | |
134 | } | |
135 | ||
136 | /** | |
137 | * zynqmp_ipi_interrupt - Interrupt handler for IPI notification | |
138 | * | |
139 | * @irq: Interrupt number | |
140 | * @data: ZynqMP IPI mailbox platform data. | |
141 | * | |
142 | * Return: -EINVAL if there is no instance | |
143 | * IRQ_NONE if the interrupt is not ours. | |
144 | * IRQ_HANDLED if the rx interrupt was successfully handled. | |
145 | */ | |
146 | static irqreturn_t zynqmp_ipi_interrupt(int irq, void *data) | |
147 | { | |
148 | struct zynqmp_ipi_pdata *pdata = data; | |
149 | struct mbox_chan *chan; | |
150 | struct zynqmp_ipi_mbox *ipi_mbox; | |
151 | struct zynqmp_ipi_mchan *mchan; | |
152 | struct zynqmp_ipi_message *msg; | |
153 | u64 arg0, arg3; | |
154 | struct arm_smccc_res res; | |
155 | int ret, i; | |
156 | ||
157 | (void)irq; | |
158 | arg0 = SMC_IPI_MAILBOX_STATUS_ENQUIRY; | |
159 | arg3 = IPI_SMC_ENQUIRY_DIRQ_MASK; | |
160 | for (i = 0; i < pdata->num_mboxes; i++) { | |
161 | ipi_mbox = &pdata->ipi_mboxes[i]; | |
162 | mchan = &ipi_mbox->mchans[IPI_MB_CHNL_RX]; | |
163 | chan = &ipi_mbox->mbox.chans[IPI_MB_CHNL_RX]; | |
164 | zynqmp_ipi_fw_call(ipi_mbox, arg0, arg3, &res); | |
165 | ret = (int)(res.a0 & 0xFFFFFFFF); | |
166 | if (ret > 0 && ret & IPI_MB_STATUS_RECV_PENDING) { | |
167 | if (mchan->is_opened) { | |
168 | msg = mchan->rx_buf; | |
169 | msg->len = mchan->req_buf_size; | |
170 | memcpy_fromio(msg->data, mchan->req_buf, | |
171 | msg->len); | |
172 | mbox_chan_received_data(chan, (void *)msg); | |
173 | return IRQ_HANDLED; | |
174 | } | |
175 | } | |
176 | } | |
177 | return IRQ_NONE; | |
178 | } | |
179 | ||
180 | /** | |
181 | * zynqmp_ipi_peek_data - Peek to see if there are any rx messages. | |
182 | * | |
183 | * @chan: Channel Pointer | |
184 | * | |
185 | * Return: 'true' if there is pending rx data, 'false' if there is none. | |
186 | */ | |
187 | static bool zynqmp_ipi_peek_data(struct mbox_chan *chan) | |
188 | { | |
189 | struct device *dev = chan->mbox->dev; | |
190 | struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev); | |
191 | struct zynqmp_ipi_mchan *mchan = chan->con_priv; | |
192 | int ret; | |
193 | u64 arg0; | |
194 | struct arm_smccc_res res; | |
195 | ||
196 | if (WARN_ON(!ipi_mbox)) { | |
197 | dev_err(dev, "no platform drv data??\n"); | |
198 | return false; | |
199 | } | |
200 | ||
201 | arg0 = SMC_IPI_MAILBOX_STATUS_ENQUIRY; | |
202 | zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res); | |
203 | ret = (int)(res.a0 & 0xFFFFFFFF); | |
204 | ||
205 | if (mchan->chan_type == IPI_MB_CHNL_TX) { | |
206 | /* TX channel, check if the message has been acked | |
207 | * by the remote, if yes, response is available. | |
208 | */ | |
209 | if (ret < 0 || ret & IPI_MB_STATUS_SEND_PENDING) | |
210 | return false; | |
211 | else | |
212 | return true; | |
213 | } else if (ret > 0 && ret & IPI_MB_STATUS_RECV_PENDING) { | |
214 | /* RX channel, check if there is message arrived. */ | |
215 | return true; | |
216 | } | |
217 | return false; | |
218 | } | |
219 | ||
220 | /** | |
221 | * zynqmp_ipi_last_tx_done - See if the last tx message is sent | |
222 | * | |
223 | * @chan: Channel pointer | |
224 | * | |
225 | * Return: 'true' is no pending tx data, 'false' if there are any. | |
226 | */ | |
227 | static bool zynqmp_ipi_last_tx_done(struct mbox_chan *chan) | |
228 | { | |
229 | struct device *dev = chan->mbox->dev; | |
230 | struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev); | |
231 | struct zynqmp_ipi_mchan *mchan = chan->con_priv; | |
232 | int ret; | |
233 | u64 arg0; | |
234 | struct arm_smccc_res res; | |
235 | ||
236 | if (WARN_ON(!ipi_mbox)) { | |
237 | dev_err(dev, "no platform drv data??\n"); | |
238 | return false; | |
239 | } | |
240 | ||
241 | if (mchan->chan_type == IPI_MB_CHNL_TX) { | |
242 | /* We only need to check if the message been taken | |
243 | * by the remote in the TX channel | |
244 | */ | |
245 | arg0 = SMC_IPI_MAILBOX_STATUS_ENQUIRY; | |
246 | zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res); | |
247 | /* Check the SMC call status, a0 of the result */ | |
248 | ret = (int)(res.a0 & 0xFFFFFFFF); | |
249 | if (ret < 0 || ret & IPI_MB_STATUS_SEND_PENDING) | |
250 | return false; | |
251 | return true; | |
252 | } | |
253 | /* Always true for the response message in RX channel */ | |
254 | return true; | |
255 | } | |
256 | ||
257 | /** | |
258 | * zynqmp_ipi_send_data - Send data | |
259 | * | |
260 | * @chan: Channel Pointer | |
261 | * @data: Message Pointer | |
262 | * | |
263 | * Return: 0 if all goes good, else appropriate error messages. | |
264 | */ | |
265 | static int zynqmp_ipi_send_data(struct mbox_chan *chan, void *data) | |
266 | { | |
267 | struct device *dev = chan->mbox->dev; | |
268 | struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev); | |
269 | struct zynqmp_ipi_mchan *mchan = chan->con_priv; | |
270 | struct zynqmp_ipi_message *msg = data; | |
271 | u64 arg0; | |
272 | struct arm_smccc_res res; | |
273 | ||
274 | if (WARN_ON(!ipi_mbox)) { | |
275 | dev_err(dev, "no platform drv data??\n"); | |
276 | return -EINVAL; | |
277 | } | |
278 | ||
279 | if (mchan->chan_type == IPI_MB_CHNL_TX) { | |
280 | /* Send request message */ | |
281 | if (msg && msg->len > mchan->req_buf_size) { | |
282 | dev_err(dev, "channel %d message length %u > max %lu\n", | |
283 | mchan->chan_type, (unsigned int)msg->len, | |
284 | mchan->req_buf_size); | |
285 | return -EINVAL; | |
286 | } | |
287 | if (msg && msg->len) | |
288 | memcpy_toio(mchan->req_buf, msg->data, msg->len); | |
289 | /* Kick IPI mailbox to send message */ | |
290 | arg0 = SMC_IPI_MAILBOX_NOTIFY; | |
291 | zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res); | |
292 | } else { | |
293 | /* Send response message */ | |
294 | if (msg && msg->len > mchan->resp_buf_size) { | |
295 | dev_err(dev, "channel %d message length %u > max %lu\n", | |
296 | mchan->chan_type, (unsigned int)msg->len, | |
297 | mchan->resp_buf_size); | |
298 | return -EINVAL; | |
299 | } | |
300 | if (msg && msg->len) | |
301 | memcpy_toio(mchan->resp_buf, msg->data, msg->len); | |
302 | arg0 = SMC_IPI_MAILBOX_ACK; | |
303 | zynqmp_ipi_fw_call(ipi_mbox, arg0, IPI_SMC_ACK_EIRQ_MASK, | |
304 | &res); | |
305 | } | |
306 | return 0; | |
307 | } | |
308 | ||
309 | /** | |
310 | * zynqmp_ipi_startup - Startup the IPI channel | |
311 | * | |
312 | * @chan: Channel pointer | |
313 | * | |
314 | * Return: 0 if all goes good, else return corresponding error message | |
315 | */ | |
316 | static int zynqmp_ipi_startup(struct mbox_chan *chan) | |
317 | { | |
318 | struct device *dev = chan->mbox->dev; | |
319 | struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev); | |
320 | struct zynqmp_ipi_mchan *mchan = chan->con_priv; | |
321 | u64 arg0; | |
322 | struct arm_smccc_res res; | |
323 | int ret = 0; | |
324 | unsigned int nchan_type; | |
325 | ||
326 | if (mchan->is_opened) | |
327 | return 0; | |
328 | ||
329 | /* If no channel has been opened, open the IPI mailbox */ | |
330 | nchan_type = (mchan->chan_type + 1) % 2; | |
331 | if (!ipi_mbox->mchans[nchan_type].is_opened) { | |
332 | arg0 = SMC_IPI_MAILBOX_OPEN; | |
333 | zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res); | |
334 | /* Check the SMC call status, a0 of the result */ | |
335 | ret = (int)(res.a0 & 0xFFFFFFFF); | |
336 | if (ret < 0) { | |
337 | dev_err(dev, "SMC to open the IPI channel failed.\n"); | |
338 | return ret; | |
339 | } | |
340 | ret = 0; | |
341 | } | |
342 | ||
343 | /* If it is RX channel, enable the IPI notification interrupt */ | |
344 | if (mchan->chan_type == IPI_MB_CHNL_RX) { | |
345 | arg0 = SMC_IPI_MAILBOX_ENABLE_IRQ; | |
346 | zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res); | |
347 | } | |
348 | mchan->is_opened = 1; | |
349 | ||
350 | return ret; | |
351 | } | |
352 | ||
353 | /** | |
354 | * zynqmp_ipi_shutdown - Shutdown the IPI channel | |
355 | * | |
356 | * @chan: Channel pointer | |
357 | */ | |
358 | static void zynqmp_ipi_shutdown(struct mbox_chan *chan) | |
359 | { | |
360 | struct device *dev = chan->mbox->dev; | |
361 | struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev); | |
362 | struct zynqmp_ipi_mchan *mchan = chan->con_priv; | |
363 | u64 arg0; | |
364 | struct arm_smccc_res res; | |
365 | unsigned int chan_type; | |
366 | ||
367 | if (!mchan->is_opened) | |
368 | return; | |
369 | ||
370 | /* If it is RX channel, disable notification interrupt */ | |
371 | chan_type = mchan->chan_type; | |
372 | if (chan_type == IPI_MB_CHNL_RX) { | |
373 | arg0 = SMC_IPI_MAILBOX_DISABLE_IRQ; | |
374 | zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res); | |
375 | } | |
376 | /* Release IPI mailbox if no other channel is opened */ | |
377 | chan_type = (chan_type + 1) % 2; | |
378 | if (!ipi_mbox->mchans[chan_type].is_opened) { | |
379 | arg0 = SMC_IPI_MAILBOX_RELEASE; | |
380 | zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res); | |
381 | } | |
382 | ||
383 | mchan->is_opened = 0; | |
384 | } | |
385 | ||
386 | /* ZynqMP IPI mailbox operations */ | |
387 | static const struct mbox_chan_ops zynqmp_ipi_chan_ops = { | |
388 | .startup = zynqmp_ipi_startup, | |
389 | .shutdown = zynqmp_ipi_shutdown, | |
390 | .peek_data = zynqmp_ipi_peek_data, | |
391 | .last_tx_done = zynqmp_ipi_last_tx_done, | |
392 | .send_data = zynqmp_ipi_send_data, | |
393 | }; | |
394 | ||
395 | /** | |
396 | * zynqmp_ipi_of_xlate - Translate of phandle to IPI mailbox channel | |
397 | * | |
398 | * @mbox: mailbox controller pointer | |
399 | * @p: phandle pointer | |
400 | * | |
401 | * Return: Mailbox channel, else return error pointer. | |
402 | */ | |
403 | static struct mbox_chan *zynqmp_ipi_of_xlate(struct mbox_controller *mbox, | |
404 | const struct of_phandle_args *p) | |
405 | { | |
406 | struct mbox_chan *chan; | |
407 | struct device *dev = mbox->dev; | |
408 | unsigned int chan_type; | |
409 | ||
410 | /* Only supports TX and RX channels */ | |
411 | chan_type = p->args[0]; | |
412 | if (chan_type != IPI_MB_CHNL_TX && chan_type != IPI_MB_CHNL_RX) { | |
413 | dev_err(dev, "req chnl failure: invalid chnl type %u.\n", | |
414 | chan_type); | |
415 | return ERR_PTR(-EINVAL); | |
416 | } | |
417 | chan = &mbox->chans[chan_type]; | |
418 | return chan; | |
419 | } | |
420 | ||
421 | static const struct of_device_id zynqmp_ipi_of_match[] = { | |
422 | { .compatible = "xlnx,zynqmp-ipi-mailbox" }, | |
423 | {}, | |
424 | }; | |
425 | MODULE_DEVICE_TABLE(of, zynqmp_ipi_of_match); | |
426 | ||
427 | /** | |
428 | * zynqmp_ipi_mbox_get_buf_res - Get buffer resource from the IPI dev node | |
429 | * | |
430 | * @node: IPI mbox device child node | |
431 | * @name: name of the IPI buffer | |
432 | * @res: pointer to where the resource information will be stored. | |
433 | * | |
434 | * Return: 0 for success, negative value for failure | |
435 | */ | |
436 | static int zynqmp_ipi_mbox_get_buf_res(struct device_node *node, | |
437 | const char *name, | |
438 | struct resource *res) | |
439 | { | |
440 | int ret, index; | |
441 | ||
442 | index = of_property_match_string(node, "reg-names", name); | |
443 | if (index >= 0) { | |
444 | ret = of_address_to_resource(node, index, res); | |
445 | if (ret < 0) | |
446 | return -EINVAL; | |
447 | return 0; | |
448 | } | |
449 | return -ENODEV; | |
450 | } | |
451 | ||
452 | /** | |
453 | * zynqmp_ipi_mbox_dev_release() - release the existence of a ipi mbox dev | |
454 | * | |
455 | * @dev: the ipi mailbox device | |
456 | * | |
457 | * This is to avoid the no device release() function kernel warning. | |
458 | * | |
459 | */ | |
460 | static void zynqmp_ipi_mbox_dev_release(struct device *dev) | |
461 | { | |
462 | (void)dev; | |
463 | } | |
464 | ||
465 | /** | |
466 | * zynqmp_ipi_mbox_probe - probe IPI mailbox resource from device node | |
467 | * | |
468 | * @ipi_mbox: pointer to IPI mailbox private data structure | |
469 | * @node: IPI mailbox device node | |
470 | * | |
471 | * Return: 0 for success, negative value for failure | |
472 | */ | |
473 | static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox *ipi_mbox, | |
474 | struct device_node *node) | |
475 | { | |
476 | struct zynqmp_ipi_mchan *mchan; | |
477 | struct mbox_chan *chans; | |
478 | struct mbox_controller *mbox; | |
479 | struct resource res; | |
480 | struct device *dev, *mdev; | |
481 | const char *name; | |
482 | int ret; | |
483 | ||
484 | dev = ipi_mbox->pdata->dev; | |
485 | /* Initialize dev for IPI mailbox */ | |
486 | ipi_mbox->dev.parent = dev; | |
487 | ipi_mbox->dev.release = NULL; | |
488 | ipi_mbox->dev.of_node = node; | |
489 | dev_set_name(&ipi_mbox->dev, "%s", of_node_full_name(node)); | |
490 | dev_set_drvdata(&ipi_mbox->dev, ipi_mbox); | |
491 | ipi_mbox->dev.release = zynqmp_ipi_mbox_dev_release; | |
492 | ipi_mbox->dev.driver = &zynqmp_ipi_mbox_driver; | |
493 | ret = device_register(&ipi_mbox->dev); | |
494 | if (ret) { | |
495 | dev_err(dev, "Failed to register ipi mbox dev.\n"); | |
496 | return ret; | |
497 | } | |
498 | mdev = &ipi_mbox->dev; | |
499 | ||
500 | mchan = &ipi_mbox->mchans[IPI_MB_CHNL_TX]; | |
501 | name = "local_request_region"; | |
502 | ret = zynqmp_ipi_mbox_get_buf_res(node, name, &res); | |
503 | if (!ret) { | |
504 | mchan->req_buf_size = resource_size(&res); | |
505 | mchan->req_buf = devm_ioremap(mdev, res.start, | |
506 | mchan->req_buf_size); | |
445aeeb5 | 507 | if (!mchan->req_buf) { |
4981b82b | 508 | dev_err(mdev, "Unable to map IPI buffer I/O memory\n"); |
445aeeb5 | 509 | return -ENOMEM; |
4981b82b WL |
510 | } |
511 | } else if (ret != -ENODEV) { | |
512 | dev_err(mdev, "Unmatched resource %s, %d.\n", name, ret); | |
513 | return ret; | |
514 | } | |
515 | ||
516 | name = "remote_response_region"; | |
517 | ret = zynqmp_ipi_mbox_get_buf_res(node, name, &res); | |
518 | if (!ret) { | |
519 | mchan->resp_buf_size = resource_size(&res); | |
520 | mchan->resp_buf = devm_ioremap(mdev, res.start, | |
521 | mchan->resp_buf_size); | |
445aeeb5 | 522 | if (!mchan->resp_buf) { |
4981b82b | 523 | dev_err(mdev, "Unable to map IPI buffer I/O memory\n"); |
445aeeb5 | 524 | return -ENOMEM; |
4981b82b WL |
525 | } |
526 | } else if (ret != -ENODEV) { | |
527 | dev_err(mdev, "Unmatched resource %s.\n", name); | |
528 | return ret; | |
529 | } | |
530 | mchan->rx_buf = devm_kzalloc(mdev, | |
531 | mchan->resp_buf_size + | |
532 | sizeof(struct zynqmp_ipi_message), | |
533 | GFP_KERNEL); | |
534 | if (!mchan->rx_buf) | |
535 | return -ENOMEM; | |
536 | ||
537 | mchan = &ipi_mbox->mchans[IPI_MB_CHNL_RX]; | |
538 | name = "remote_request_region"; | |
539 | ret = zynqmp_ipi_mbox_get_buf_res(node, name, &res); | |
540 | if (!ret) { | |
541 | mchan->req_buf_size = resource_size(&res); | |
542 | mchan->req_buf = devm_ioremap(mdev, res.start, | |
543 | mchan->req_buf_size); | |
445aeeb5 | 544 | if (!mchan->req_buf) { |
4981b82b | 545 | dev_err(mdev, "Unable to map IPI buffer I/O memory\n"); |
445aeeb5 | 546 | return -ENOMEM; |
4981b82b WL |
547 | } |
548 | } else if (ret != -ENODEV) { | |
549 | dev_err(mdev, "Unmatched resource %s.\n", name); | |
550 | return ret; | |
551 | } | |
552 | ||
553 | name = "local_response_region"; | |
554 | ret = zynqmp_ipi_mbox_get_buf_res(node, name, &res); | |
555 | if (!ret) { | |
556 | mchan->resp_buf_size = resource_size(&res); | |
557 | mchan->resp_buf = devm_ioremap(mdev, res.start, | |
558 | mchan->resp_buf_size); | |
445aeeb5 | 559 | if (!mchan->resp_buf) { |
4981b82b | 560 | dev_err(mdev, "Unable to map IPI buffer I/O memory\n"); |
445aeeb5 | 561 | return -ENOMEM; |
4981b82b WL |
562 | } |
563 | } else if (ret != -ENODEV) { | |
564 | dev_err(mdev, "Unmatched resource %s.\n", name); | |
565 | return ret; | |
566 | } | |
567 | mchan->rx_buf = devm_kzalloc(mdev, | |
568 | mchan->resp_buf_size + | |
569 | sizeof(struct zynqmp_ipi_message), | |
570 | GFP_KERNEL); | |
571 | if (!mchan->rx_buf) | |
572 | return -ENOMEM; | |
573 | ||
574 | /* Get the IPI remote agent ID */ | |
575 | ret = of_property_read_u32(node, "xlnx,ipi-id", &ipi_mbox->remote_id); | |
576 | if (ret < 0) { | |
577 | dev_err(dev, "No IPI remote ID is specified.\n"); | |
578 | return ret; | |
579 | } | |
580 | ||
581 | mbox = &ipi_mbox->mbox; | |
582 | mbox->dev = mdev; | |
583 | mbox->ops = &zynqmp_ipi_chan_ops; | |
584 | mbox->num_chans = 2; | |
585 | mbox->txdone_irq = false; | |
586 | mbox->txdone_poll = true; | |
587 | mbox->txpoll_period = 5; | |
588 | mbox->of_xlate = zynqmp_ipi_of_xlate; | |
589 | chans = devm_kzalloc(mdev, 2 * sizeof(*chans), GFP_KERNEL); | |
590 | if (!chans) | |
591 | return -ENOMEM; | |
592 | mbox->chans = chans; | |
593 | chans[IPI_MB_CHNL_TX].con_priv = &ipi_mbox->mchans[IPI_MB_CHNL_TX]; | |
594 | chans[IPI_MB_CHNL_RX].con_priv = &ipi_mbox->mchans[IPI_MB_CHNL_RX]; | |
595 | ipi_mbox->mchans[IPI_MB_CHNL_TX].chan_type = IPI_MB_CHNL_TX; | |
596 | ipi_mbox->mchans[IPI_MB_CHNL_RX].chan_type = IPI_MB_CHNL_RX; | |
597 | ret = devm_mbox_controller_register(mdev, mbox); | |
598 | if (ret) | |
599 | dev_err(mdev, | |
600 | "Failed to register mbox_controller(%d)\n", ret); | |
601 | else | |
602 | dev_info(mdev, | |
603 | "Registered ZynqMP IPI mbox with TX/RX channels.\n"); | |
604 | return ret; | |
605 | } | |
606 | ||
607 | /** | |
608 | * zynqmp_ipi_free_mboxes - Free IPI mailboxes devices | |
609 | * | |
610 | * @pdata: IPI private data | |
611 | */ | |
612 | static void zynqmp_ipi_free_mboxes(struct zynqmp_ipi_pdata *pdata) | |
613 | { | |
614 | struct zynqmp_ipi_mbox *ipi_mbox; | |
615 | int i; | |
616 | ||
617 | i = pdata->num_mboxes; | |
618 | for (; i >= 0; i--) { | |
619 | ipi_mbox = &pdata->ipi_mboxes[i]; | |
620 | if (ipi_mbox->dev.parent) { | |
621 | mbox_controller_unregister(&ipi_mbox->mbox); | |
622 | device_unregister(&ipi_mbox->dev); | |
623 | } | |
624 | } | |
625 | } | |
626 | ||
627 | static int zynqmp_ipi_probe(struct platform_device *pdev) | |
628 | { | |
629 | struct device *dev = &pdev->dev; | |
630 | struct device_node *nc, *np = pdev->dev.of_node; | |
631 | struct zynqmp_ipi_pdata *pdata; | |
632 | struct zynqmp_ipi_mbox *mbox; | |
633 | int num_mboxes, ret = -EINVAL; | |
634 | ||
635 | num_mboxes = of_get_child_count(np); | |
636 | pdata = devm_kzalloc(dev, sizeof(*pdata) + (num_mboxes * sizeof(*mbox)), | |
637 | GFP_KERNEL); | |
638 | if (!pdata) | |
639 | return -ENOMEM; | |
640 | pdata->dev = dev; | |
641 | ||
642 | /* Get the IPI local agents ID */ | |
643 | ret = of_property_read_u32(np, "xlnx,ipi-id", &pdata->local_id); | |
644 | if (ret < 0) { | |
645 | dev_err(dev, "No IPI local ID is specified.\n"); | |
646 | return ret; | |
647 | } | |
648 | ||
649 | pdata->num_mboxes = num_mboxes; | |
650 | pdata->ipi_mboxes = (struct zynqmp_ipi_mbox *) | |
651 | ((char *)pdata + sizeof(*pdata)); | |
652 | ||
653 | mbox = pdata->ipi_mboxes; | |
654 | for_each_available_child_of_node(np, nc) { | |
655 | mbox->pdata = pdata; | |
656 | ret = zynqmp_ipi_mbox_probe(mbox, nc); | |
657 | if (ret) { | |
658 | dev_err(dev, "failed to probe subdev.\n"); | |
659 | ret = -EINVAL; | |
660 | goto free_mbox_dev; | |
661 | } | |
662 | mbox++; | |
663 | } | |
664 | ||
665 | /* IPI IRQ */ | |
666 | ret = platform_get_irq(pdev, 0); | |
ec32481b | 667 | if (ret < 0) |
4981b82b | 668 | goto free_mbox_dev; |
ec32481b | 669 | |
4981b82b WL |
670 | pdata->irq = ret; |
671 | ret = devm_request_irq(dev, pdata->irq, zynqmp_ipi_interrupt, | |
672 | IRQF_SHARED, dev_name(dev), pdata); | |
673 | if (ret) { | |
674 | dev_err(dev, "IRQ %d is not requested successfully.\n", | |
675 | pdata->irq); | |
676 | goto free_mbox_dev; | |
677 | } | |
678 | ||
679 | platform_set_drvdata(pdev, pdata); | |
680 | return ret; | |
681 | ||
682 | free_mbox_dev: | |
683 | zynqmp_ipi_free_mboxes(pdata); | |
684 | return ret; | |
685 | } | |
686 | ||
687 | static int zynqmp_ipi_remove(struct platform_device *pdev) | |
688 | { | |
689 | struct zynqmp_ipi_pdata *pdata; | |
690 | ||
691 | pdata = platform_get_drvdata(pdev); | |
692 | zynqmp_ipi_free_mboxes(pdata); | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | static struct platform_driver zynqmp_ipi_driver = { | |
698 | .probe = zynqmp_ipi_probe, | |
699 | .remove = zynqmp_ipi_remove, | |
700 | .driver = { | |
701 | .name = "zynqmp-ipi", | |
702 | .of_match_table = of_match_ptr(zynqmp_ipi_of_match), | |
703 | }, | |
704 | }; | |
705 | ||
706 | static int __init zynqmp_ipi_init(void) | |
707 | { | |
708 | return platform_driver_register(&zynqmp_ipi_driver); | |
709 | } | |
710 | subsys_initcall(zynqmp_ipi_init); | |
711 | ||
712 | static void __exit zynqmp_ipi_exit(void) | |
713 | { | |
714 | platform_driver_unregister(&zynqmp_ipi_driver); | |
715 | } | |
716 | module_exit(zynqmp_ipi_exit); | |
717 | ||
718 | MODULE_LICENSE("GPL v2"); | |
719 | MODULE_DESCRIPTION("Xilinx ZynqMP IPI Mailbox driver"); | |
720 | MODULE_AUTHOR("Xilinx Inc."); |