1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * System Control and Power Interface (SCPI) Message Protocol driver |
4 | * |
5 | * SCPI Message Protocol is used between the System Control Processor(SCP) |
6 | * and the Application Processors(AP). The Message Handling Unit(MHU) |
7 | * provides a mechanism for inter-processor communication between SCP's |
8 | * Cortex M3 and AP. |
9 | * |
10 | * SCP offers control and management of the core/cluster power states, |
11 | * various power domain DVFS including the core/cluster, certain system |
12 | * clocks configuration, thermal sensors and many others. |
13 | * |
14 | * Copyright (C) 2015 ARM Ltd. |
15 | */ |
16 | |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | |
19 | #include <linux/bitmap.h> |
20 | #include <linux/bitfield.h> |
21 | #include <linux/device.h> |
22 | #include <linux/err.h> |
23 | #include <linux/export.h> |
24 | #include <linux/io.h> |
25 | #include <linux/kernel.h> |
26 | #include <linux/list.h> |
27 | #include <linux/mailbox_client.h> |
28 | #include <linux/module.h> |
29 | #include <linux/of.h> |
30 | #include <linux/of_address.h> |
31 | #include <linux/of_platform.h> |
32 | #include <linux/platform_device.h> |
33 | #include <linux/printk.h> |
34 | #include <linux/property.h> |
35 | #include <linux/pm_opp.h> |
36 | #include <linux/scpi_protocol.h> |
37 | #include <linux/slab.h> |
38 | #include <linux/sort.h> |
39 | #include <linux/spinlock.h> |
40 | |
41 | #define CMD_ID_MASK GENMASK(6, 0) |
42 | #define CMD_TOKEN_ID_MASK GENMASK(15, 8) |
43 | #define CMD_DATA_SIZE_MASK GENMASK(24, 16) |
44 | #define CMD_LEGACY_DATA_SIZE_MASK GENMASK(28, 20) |
45 | #define PACK_SCPI_CMD(cmd_id, tx_sz) \ |
46 | (FIELD_PREP(CMD_ID_MASK, cmd_id) | \ |
47 | FIELD_PREP(CMD_DATA_SIZE_MASK, tx_sz)) |
48 | #define PACK_LEGACY_SCPI_CMD(cmd_id, tx_sz) \ |
49 | (FIELD_PREP(CMD_ID_MASK, cmd_id) | \ |
50 | FIELD_PREP(CMD_LEGACY_DATA_SIZE_MASK, tx_sz)) |
51 | |
52 | #define CMD_SIZE(cmd) FIELD_GET(CMD_DATA_SIZE_MASK, cmd) |
53 | #define CMD_UNIQ_MASK (CMD_TOKEN_ID_MASK | CMD_ID_MASK) |
54 | #define CMD_XTRACT_UNIQ(cmd) ((cmd) & CMD_UNIQ_MASK) |
55 | |
56 | #define SCPI_SLOT 0 |
57 | |
58 | #define MAX_DVFS_DOMAINS 8 |
59 | #define MAX_DVFS_OPPS 16 |
60 | |
61 | #define PROTO_REV_MAJOR_MASK GENMASK(31, 16) |
62 | #define PROTO_REV_MINOR_MASK GENMASK(15, 0) |
63 | |
64 | #define FW_REV_MAJOR_MASK GENMASK(31, 24) |
65 | #define FW_REV_MINOR_MASK GENMASK(23, 16) |
66 | #define FW_REV_PATCH_MASK GENMASK(15, 0) |
67 | |
68 | #define MAX_RX_TIMEOUT (msecs_to_jiffies(30)) |
69 | |
70 | enum scpi_error_codes { |
71 | SCPI_SUCCESS = 0, /* Success */ |
72 | SCPI_ERR_PARAM = 1, /* Invalid parameter(s) */ |
73 | SCPI_ERR_ALIGN = 2, /* Invalid alignment */ |
74 | SCPI_ERR_SIZE = 3, /* Invalid size */ |
75 | SCPI_ERR_HANDLER = 4, /* Invalid handler/callback */ |
76 | SCPI_ERR_ACCESS = 5, /* Invalid access/permission denied */ |
77 | SCPI_ERR_RANGE = 6, /* Value out of range */ |
78 | SCPI_ERR_TIMEOUT = 7, /* Timeout has occurred */ |
79 | SCPI_ERR_NOMEM = 8, /* Invalid memory area or pointer */ |
80 | SCPI_ERR_PWRSTATE = 9, /* Invalid power state */ |
81 | SCPI_ERR_SUPPORT = 10, /* Not supported or disabled */ |
82 | SCPI_ERR_DEVICE = 11, /* Device error */ |
83 | SCPI_ERR_BUSY = 12, /* Device busy */ |
84 | SCPI_ERR_MAX |
85 | }; |
86 | |
87 | /* SCPI Standard commands */ |
88 | enum scpi_std_cmd { |
89 | SCPI_CMD_INVALID = 0x00, |
90 | SCPI_CMD_SCPI_READY = 0x01, |
91 | SCPI_CMD_SCPI_CAPABILITIES = 0x02, |
92 | SCPI_CMD_SET_CSS_PWR_STATE = 0x03, |
93 | SCPI_CMD_GET_CSS_PWR_STATE = 0x04, |
94 | SCPI_CMD_SET_SYS_PWR_STATE = 0x05, |
95 | SCPI_CMD_SET_CPU_TIMER = 0x06, |
96 | SCPI_CMD_CANCEL_CPU_TIMER = 0x07, |
97 | SCPI_CMD_DVFS_CAPABILITIES = 0x08, |
98 | SCPI_CMD_GET_DVFS_INFO = 0x09, |
99 | SCPI_CMD_SET_DVFS = 0x0a, |
100 | SCPI_CMD_GET_DVFS = 0x0b, |
101 | SCPI_CMD_GET_DVFS_STAT = 0x0c, |
102 | SCPI_CMD_CLOCK_CAPABILITIES = 0x0d, |
103 | SCPI_CMD_GET_CLOCK_INFO = 0x0e, |
104 | SCPI_CMD_SET_CLOCK_VALUE = 0x0f, |
105 | SCPI_CMD_GET_CLOCK_VALUE = 0x10, |
106 | SCPI_CMD_PSU_CAPABILITIES = 0x11, |
107 | SCPI_CMD_GET_PSU_INFO = 0x12, |
108 | SCPI_CMD_SET_PSU = 0x13, |
109 | SCPI_CMD_GET_PSU = 0x14, |
110 | SCPI_CMD_SENSOR_CAPABILITIES = 0x15, |
111 | SCPI_CMD_SENSOR_INFO = 0x16, |
112 | SCPI_CMD_SENSOR_VALUE = 0x17, |
113 | SCPI_CMD_SENSOR_CFG_PERIODIC = 0x18, |
114 | SCPI_CMD_SENSOR_CFG_BOUNDS = 0x19, |
115 | SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1a, |
116 | SCPI_CMD_SET_DEVICE_PWR_STATE = 0x1b, |
117 | SCPI_CMD_GET_DEVICE_PWR_STATE = 0x1c, |
118 | SCPI_CMD_COUNT |
119 | }; |
120 | |
121 | /* SCPI Legacy Commands */ |
122 | enum legacy_scpi_std_cmd { |
123 | LEGACY_SCPI_CMD_INVALID = 0x00, |
124 | LEGACY_SCPI_CMD_SCPI_READY = 0x01, |
125 | LEGACY_SCPI_CMD_SCPI_CAPABILITIES = 0x02, |
126 | LEGACY_SCPI_CMD_EVENT = 0x03, |
127 | LEGACY_SCPI_CMD_SET_CSS_PWR_STATE = 0x04, |
128 | LEGACY_SCPI_CMD_GET_CSS_PWR_STATE = 0x05, |
129 | LEGACY_SCPI_CMD_CFG_PWR_STATE_STAT = 0x06, |
130 | LEGACY_SCPI_CMD_GET_PWR_STATE_STAT = 0x07, |
131 | LEGACY_SCPI_CMD_SYS_PWR_STATE = 0x08, |
132 | LEGACY_SCPI_CMD_L2_READY = 0x09, |
133 | LEGACY_SCPI_CMD_SET_AP_TIMER = 0x0a, |
134 | LEGACY_SCPI_CMD_CANCEL_AP_TIME = 0x0b, |
135 | LEGACY_SCPI_CMD_DVFS_CAPABILITIES = 0x0c, |
136 | LEGACY_SCPI_CMD_GET_DVFS_INFO = 0x0d, |
137 | LEGACY_SCPI_CMD_SET_DVFS = 0x0e, |
138 | LEGACY_SCPI_CMD_GET_DVFS = 0x0f, |
139 | LEGACY_SCPI_CMD_GET_DVFS_STAT = 0x10, |
140 | LEGACY_SCPI_CMD_SET_RTC = 0x11, |
141 | LEGACY_SCPI_CMD_GET_RTC = 0x12, |
142 | LEGACY_SCPI_CMD_CLOCK_CAPABILITIES = 0x13, |
143 | LEGACY_SCPI_CMD_SET_CLOCK_INDEX = 0x14, |
144 | LEGACY_SCPI_CMD_SET_CLOCK_VALUE = 0x15, |
145 | LEGACY_SCPI_CMD_GET_CLOCK_VALUE = 0x16, |
146 | LEGACY_SCPI_CMD_PSU_CAPABILITIES = 0x17, |
147 | LEGACY_SCPI_CMD_SET_PSU = 0x18, |
148 | LEGACY_SCPI_CMD_GET_PSU = 0x19, |
149 | LEGACY_SCPI_CMD_SENSOR_CAPABILITIES = 0x1a, |
150 | LEGACY_SCPI_CMD_SENSOR_INFO = 0x1b, |
151 | LEGACY_SCPI_CMD_SENSOR_VALUE = 0x1c, |
152 | LEGACY_SCPI_CMD_SENSOR_CFG_PERIODIC = 0x1d, |
153 | LEGACY_SCPI_CMD_SENSOR_CFG_BOUNDS = 0x1e, |
154 | LEGACY_SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1f, |
155 | LEGACY_SCPI_CMD_COUNT |
156 | }; |
157 | |
158 | /* List all commands that are required to go through the high priority link */ |
159 | static int legacy_hpriority_cmds[] = { |
160 | LEGACY_SCPI_CMD_GET_CSS_PWR_STATE, |
161 | LEGACY_SCPI_CMD_CFG_PWR_STATE_STAT, |
162 | LEGACY_SCPI_CMD_GET_PWR_STATE_STAT, |
163 | LEGACY_SCPI_CMD_SET_DVFS, |
164 | LEGACY_SCPI_CMD_GET_DVFS, |
165 | LEGACY_SCPI_CMD_SET_RTC, |
166 | LEGACY_SCPI_CMD_GET_RTC, |
167 | LEGACY_SCPI_CMD_SET_CLOCK_INDEX, |
168 | LEGACY_SCPI_CMD_SET_CLOCK_VALUE, |
169 | LEGACY_SCPI_CMD_GET_CLOCK_VALUE, |
170 | LEGACY_SCPI_CMD_SET_PSU, |
171 | LEGACY_SCPI_CMD_GET_PSU, |
172 | LEGACY_SCPI_CMD_SENSOR_CFG_PERIODIC, |
173 | LEGACY_SCPI_CMD_SENSOR_CFG_BOUNDS, |
174 | }; |
175 | |
176 | /* List all commands used by this driver, used as indexes */ |
177 | enum scpi_drv_cmds { |
178 | CMD_SCPI_CAPABILITIES = 0, |
179 | CMD_GET_CLOCK_INFO, |
180 | CMD_GET_CLOCK_VALUE, |
181 | CMD_SET_CLOCK_VALUE, |
182 | CMD_GET_DVFS, |
183 | CMD_SET_DVFS, |
184 | CMD_GET_DVFS_INFO, |
185 | CMD_SENSOR_CAPABILITIES, |
186 | CMD_SENSOR_INFO, |
187 | CMD_SENSOR_VALUE, |
188 | CMD_SET_DEVICE_PWR_STATE, |
189 | CMD_GET_DEVICE_PWR_STATE, |
190 | CMD_MAX_COUNT, |
191 | }; |
192 | |
193 | static int scpi_std_commands[CMD_MAX_COUNT] = { |
194 | SCPI_CMD_SCPI_CAPABILITIES, |
195 | SCPI_CMD_GET_CLOCK_INFO, |
196 | SCPI_CMD_GET_CLOCK_VALUE, |
197 | SCPI_CMD_SET_CLOCK_VALUE, |
198 | SCPI_CMD_GET_DVFS, |
199 | SCPI_CMD_SET_DVFS, |
200 | SCPI_CMD_GET_DVFS_INFO, |
201 | SCPI_CMD_SENSOR_CAPABILITIES, |
202 | SCPI_CMD_SENSOR_INFO, |
203 | SCPI_CMD_SENSOR_VALUE, |
204 | SCPI_CMD_SET_DEVICE_PWR_STATE, |
205 | SCPI_CMD_GET_DEVICE_PWR_STATE, |
206 | }; |
207 | |
208 | static int scpi_legacy_commands[CMD_MAX_COUNT] = { |
209 | LEGACY_SCPI_CMD_SCPI_CAPABILITIES, |
210 | -1, /* GET_CLOCK_INFO */ |
211 | LEGACY_SCPI_CMD_GET_CLOCK_VALUE, |
212 | LEGACY_SCPI_CMD_SET_CLOCK_VALUE, |
213 | LEGACY_SCPI_CMD_GET_DVFS, |
214 | LEGACY_SCPI_CMD_SET_DVFS, |
215 | LEGACY_SCPI_CMD_GET_DVFS_INFO, |
216 | LEGACY_SCPI_CMD_SENSOR_CAPABILITIES, |
217 | LEGACY_SCPI_CMD_SENSOR_INFO, |
218 | LEGACY_SCPI_CMD_SENSOR_VALUE, |
219 | -1, /* SET_DEVICE_PWR_STATE */ |
220 | -1, /* GET_DEVICE_PWR_STATE */ |
221 | }; |
222 | |
223 | struct scpi_xfer { |
224 | u32 slot; /* has to be first element */ |
225 | u32 cmd; |
226 | u32 status; |
227 | const void *tx_buf; |
228 | void *rx_buf; |
229 | unsigned int tx_len; |
230 | unsigned int rx_len; |
231 | struct list_head node; |
232 | struct completion done; |
233 | }; |
234 | |
235 | struct scpi_chan { |
236 | struct mbox_client cl; |
237 | struct mbox_chan *chan; |
238 | void __iomem *tx_payload; |
239 | void __iomem *rx_payload; |
240 | struct list_head rx_pending; |
241 | struct list_head xfers_list; |
242 | struct scpi_xfer *xfers; |
243 | spinlock_t rx_lock; /* locking for the rx pending list */ |
244 | struct mutex xfers_lock; |
245 | u8 token; |
246 | }; |
247 | |
248 | struct scpi_drvinfo { |
249 | u32 protocol_version; |
250 | u32 firmware_version; |
251 | bool is_legacy; |
252 | int num_chans; |
253 | int *commands; |
254 | DECLARE_BITMAP(cmd_priority, LEGACY_SCPI_CMD_COUNT); |
255 | atomic_t next_chan; |
256 | struct scpi_ops *scpi_ops; |
257 | struct scpi_chan *channels; |
258 | struct scpi_dvfs_info *dvfs[MAX_DVFS_DOMAINS]; |
259 | }; |
260 | |
261 | /* |
262 | * The SCP firmware only executes in little-endian mode, so any buffers |
263 | * shared through SCPI should have their contents converted to little-endian |
264 | */ |
265 | struct scpi_shared_mem { |
266 | __le32 command; |
267 | __le32 status; |
268 | u8 payload[]; |
269 | } __packed; |
270 | |
271 | struct legacy_scpi_shared_mem { |
272 | __le32 status; |
273 | u8 payload[]; |
274 | } __packed; |
275 | |
276 | struct scp_capabilities { |
277 | __le32 protocol_version; |
278 | __le32 event_version; |
279 | __le32 platform_version; |
280 | __le32 commands[4]; |
281 | } __packed; |
282 | |
283 | struct clk_get_info { |
284 | __le16 id; |
285 | __le16 flags; |
286 | __le32 min_rate; |
287 | __le32 max_rate; |
288 | u8 name[20]; |
289 | } __packed; |
290 | |
291 | struct clk_set_value { |
292 | __le16 id; |
293 | __le16 reserved; |
294 | __le32 rate; |
295 | } __packed; |
296 | |
297 | struct legacy_clk_set_value { |
298 | __le32 rate; |
299 | __le16 id; |
300 | __le16 reserved; |
301 | } __packed; |
302 | |
303 | struct dvfs_info { |
304 | u8 domain; |
305 | u8 opp_count; |
306 | __le16 latency; |
307 | struct { |
308 | __le32 freq; |
309 | __le32 m_volt; |
310 | } opps[MAX_DVFS_OPPS]; |
311 | } __packed; |
312 | |
313 | struct dvfs_set { |
314 | u8 domain; |
315 | u8 index; |
316 | } __packed; |
317 | |
318 | struct _scpi_sensor_info { |
319 | __le16 sensor_id; |
320 | u8 class; |
321 | u8 trigger_type; |
322 | char name[20]; |
323 | }; |
324 | |
325 | struct dev_pstate_set { |
326 | __le16 dev_id; |
327 | u8 pstate; |
328 | } __packed; |
329 | |
330 | static struct scpi_drvinfo *scpi_info; |
331 | |
332 | static int scpi_linux_errmap[SCPI_ERR_MAX] = { |
333 | /* better than switch case as long as return value is continuous */ |
334 | 0, /* SCPI_SUCCESS */ |
335 | -EINVAL, /* SCPI_ERR_PARAM */ |
336 | -ENOEXEC, /* SCPI_ERR_ALIGN */ |
337 | -EMSGSIZE, /* SCPI_ERR_SIZE */ |
338 | -EINVAL, /* SCPI_ERR_HANDLER */ |
339 | -EACCES, /* SCPI_ERR_ACCESS */ |
340 | -ERANGE, /* SCPI_ERR_RANGE */ |
341 | -ETIMEDOUT, /* SCPI_ERR_TIMEOUT */ |
342 | -ENOMEM, /* SCPI_ERR_NOMEM */ |
343 | -EINVAL, /* SCPI_ERR_PWRSTATE */ |
344 | -EOPNOTSUPP, /* SCPI_ERR_SUPPORT */ |
345 | -EIO, /* SCPI_ERR_DEVICE */ |
346 | -EBUSY, /* SCPI_ERR_BUSY */ |
347 | }; |
348 | |
349 | static inline int scpi_to_linux_errno(int errno) |
350 | { |
351 | if (errno >= SCPI_SUCCESS && errno < SCPI_ERR_MAX) |
352 | return scpi_linux_errmap[errno]; |
353 | return -EIO; |
354 | } |
355 | |
356 | static void scpi_process_cmd(struct scpi_chan *ch, u32 cmd) |
357 | { |
358 | unsigned long flags; |
359 | struct scpi_xfer *t, *match = NULL; |
360 | |
361 | spin_lock_irqsave(&ch->rx_lock, flags); |
362 | if (list_empty(head: &ch->rx_pending)) { |
363 | spin_unlock_irqrestore(lock: &ch->rx_lock, flags); |
364 | return; |
365 | } |
366 | |
367 | /* Command type is not replied by the SCP Firmware in legacy Mode |
368 | * We should consider that command is the head of pending RX commands |
369 | * if the list is not empty. In TX only mode, the list would be empty. |
370 | */ |
371 | if (scpi_info->is_legacy) { |
372 | match = list_first_entry(&ch->rx_pending, struct scpi_xfer, |
373 | node); |
374 | list_del(entry: &match->node); |
375 | } else { |
376 | list_for_each_entry(t, &ch->rx_pending, node) |
377 | if (CMD_XTRACT_UNIQ(t->cmd) == CMD_XTRACT_UNIQ(cmd)) { |
378 | list_del(entry: &t->node); |
379 | match = t; |
380 | break; |
381 | } |
382 | } |
383 | /* check if wait_for_completion is in progress or timed-out */ |
384 | if (match && !completion_done(x: &match->done)) { |
385 | unsigned int len; |
386 | |
387 | if (scpi_info->is_legacy) { |
388 | struct legacy_scpi_shared_mem __iomem *mem = |
389 | ch->rx_payload; |
390 | |
391 | /* RX Length is not replied by the legacy Firmware */ |
392 | len = match->rx_len; |
393 | |
394 | match->status = ioread32(&mem->status); |
395 | memcpy_fromio(match->rx_buf, mem->payload, len); |
396 | } else { |
397 | struct scpi_shared_mem __iomem *mem = ch->rx_payload; |
398 | |
399 | len = min_t(unsigned int, match->rx_len, CMD_SIZE(cmd)); |
400 | |
401 | match->status = ioread32(&mem->status); |
402 | memcpy_fromio(match->rx_buf, mem->payload, len); |
403 | } |
404 | |
405 | if (match->rx_len > len) |
406 | memset(match->rx_buf + len, 0, match->rx_len - len); |
407 | complete(&match->done); |
408 | } |
409 | spin_unlock_irqrestore(lock: &ch->rx_lock, flags); |
410 | } |
411 | |
412 | static void scpi_handle_remote_msg(struct mbox_client *c, void *msg) |
413 | { |
414 | struct scpi_chan *ch = container_of(c, struct scpi_chan, cl); |
415 | struct scpi_shared_mem __iomem *mem = ch->rx_payload; |
416 | u32 cmd = 0; |
417 | |
418 | if (!scpi_info->is_legacy) |
419 | cmd = ioread32(&mem->command); |
420 | |
421 | scpi_process_cmd(ch, cmd); |
422 | } |
423 | |
424 | static void scpi_tx_prepare(struct mbox_client *c, void *msg) |
425 | { |
426 | unsigned long flags; |
427 | struct scpi_xfer *t = msg; |
428 | struct scpi_chan *ch = container_of(c, struct scpi_chan, cl); |
429 | struct scpi_shared_mem __iomem *mem = ch->tx_payload; |
430 | |
431 | if (t->tx_buf) { |
432 | if (scpi_info->is_legacy) |
433 | memcpy_toio(ch->tx_payload, t->tx_buf, t->tx_len); |
434 | else |
435 | memcpy_toio(mem->payload, t->tx_buf, t->tx_len); |
436 | } |
437 | |
438 | if (t->rx_buf) { |
439 | if (!(++ch->token)) |
440 | ++ch->token; |
441 | t->cmd |= FIELD_PREP(CMD_TOKEN_ID_MASK, ch->token); |
442 | spin_lock_irqsave(&ch->rx_lock, flags); |
443 | list_add_tail(new: &t->node, head: &ch->rx_pending); |
444 | spin_unlock_irqrestore(lock: &ch->rx_lock, flags); |
445 | } |
446 | |
447 | if (!scpi_info->is_legacy) |
448 | iowrite32(t->cmd, &mem->command); |
449 | } |
450 | |
451 | static struct scpi_xfer *get_scpi_xfer(struct scpi_chan *ch) |
452 | { |
453 | struct scpi_xfer *t; |
454 | |
455 | mutex_lock(&ch->xfers_lock); |
456 | if (list_empty(head: &ch->xfers_list)) { |
457 | mutex_unlock(lock: &ch->xfers_lock); |
458 | return NULL; |
459 | } |
460 | t = list_first_entry(&ch->xfers_list, struct scpi_xfer, node); |
461 | list_del(entry: &t->node); |
462 | mutex_unlock(lock: &ch->xfers_lock); |
463 | return t; |
464 | } |
465 | |
466 | static void put_scpi_xfer(struct scpi_xfer *t, struct scpi_chan *ch) |
467 | { |
468 | mutex_lock(&ch->xfers_lock); |
469 | list_add_tail(new: &t->node, head: &ch->xfers_list); |
470 | mutex_unlock(lock: &ch->xfers_lock); |
471 | } |
472 | |
473 | static int scpi_send_message(u8 idx, void *tx_buf, unsigned int tx_len, |
474 | void *rx_buf, unsigned int rx_len) |
475 | { |
476 | int ret; |
477 | u8 chan; |
478 | u8 cmd; |
479 | struct scpi_xfer *msg; |
480 | struct scpi_chan *scpi_chan; |
481 | |
482 | if (scpi_info->commands[idx] < 0) |
483 | return -EOPNOTSUPP; |
484 | |
485 | cmd = scpi_info->commands[idx]; |
486 | |
487 | if (scpi_info->is_legacy) |
488 | chan = test_bit(cmd, scpi_info->cmd_priority) ? 1 : 0; |
489 | else |
490 | chan = atomic_inc_return(v: &scpi_info->next_chan) % |
491 | scpi_info->num_chans; |
492 | scpi_chan = scpi_info->channels + chan; |
493 | |
494 | msg = get_scpi_xfer(ch: scpi_chan); |
495 | if (!msg) |
496 | return -ENOMEM; |
497 | |
498 | if (scpi_info->is_legacy) { |
499 | msg->cmd = PACK_LEGACY_SCPI_CMD(cmd, tx_len); |
500 | msg->slot = msg->cmd; |
501 | } else { |
502 | msg->slot = BIT(SCPI_SLOT); |
503 | msg->cmd = PACK_SCPI_CMD(cmd, tx_len); |
504 | } |
505 | msg->tx_buf = tx_buf; |
506 | msg->tx_len = tx_len; |
507 | msg->rx_buf = rx_buf; |
508 | msg->rx_len = rx_len; |
509 | reinit_completion(x: &msg->done); |
510 | |
511 | ret = mbox_send_message(chan: scpi_chan->chan, mssg: msg); |
512 | if (ret < 0 || !rx_buf) |
513 | goto out; |
514 | |
515 | if (!wait_for_completion_timeout(x: &msg->done, MAX_RX_TIMEOUT)) |
516 | ret = -ETIMEDOUT; |
517 | else |
518 | /* first status word */ |
519 | ret = msg->status; |
520 | out: |
521 | if (ret < 0 && rx_buf) /* remove entry from the list if timed-out */ |
522 | scpi_process_cmd(ch: scpi_chan, cmd: msg->cmd); |
523 | |
524 | put_scpi_xfer(t: msg, ch: scpi_chan); |
525 | /* SCPI error codes > 0, translate them to Linux scale*/ |
526 | return ret > 0 ? scpi_to_linux_errno(errno: ret) : ret; |
527 | } |
528 | |
529 | static u32 scpi_get_version(void) |
530 | { |
531 | return scpi_info->protocol_version; |
532 | } |
533 | |
534 | static int |
535 | scpi_clk_get_range(u16 clk_id, unsigned long *min, unsigned long *max) |
536 | { |
537 | int ret; |
538 | struct clk_get_info clk; |
539 | __le16 le_clk_id = cpu_to_le16(clk_id); |
540 | |
541 | ret = scpi_send_message(idx: CMD_GET_CLOCK_INFO, tx_buf: &le_clk_id, |
542 | tx_len: sizeof(le_clk_id), rx_buf: &clk, rx_len: sizeof(clk)); |
543 | if (!ret) { |
544 | *min = le32_to_cpu(clk.min_rate); |
545 | *max = le32_to_cpu(clk.max_rate); |
546 | } |
547 | return ret; |
548 | } |
549 | |
550 | static unsigned long scpi_clk_get_val(u16 clk_id) |
551 | { |
552 | int ret; |
553 | __le32 rate; |
554 | __le16 le_clk_id = cpu_to_le16(clk_id); |
555 | |
556 | ret = scpi_send_message(idx: CMD_GET_CLOCK_VALUE, tx_buf: &le_clk_id, |
557 | tx_len: sizeof(le_clk_id), rx_buf: &rate, rx_len: sizeof(rate)); |
558 | if (ret) |
559 | return 0; |
560 | |
561 | return le32_to_cpu(rate); |
562 | } |
563 | |
564 | static int scpi_clk_set_val(u16 clk_id, unsigned long rate) |
565 | { |
566 | int stat; |
567 | struct clk_set_value clk = { |
568 | .id = cpu_to_le16(clk_id), |
569 | .rate = cpu_to_le32(rate) |
570 | }; |
571 | |
572 | return scpi_send_message(idx: CMD_SET_CLOCK_VALUE, tx_buf: &clk, tx_len: sizeof(clk), |
573 | rx_buf: &stat, rx_len: sizeof(stat)); |
574 | } |
575 | |
576 | static int legacy_scpi_clk_set_val(u16 clk_id, unsigned long rate) |
577 | { |
578 | int stat; |
579 | struct legacy_clk_set_value clk = { |
580 | .id = cpu_to_le16(clk_id), |
581 | .rate = cpu_to_le32(rate) |
582 | }; |
583 | |
584 | return scpi_send_message(idx: CMD_SET_CLOCK_VALUE, tx_buf: &clk, tx_len: sizeof(clk), |
585 | rx_buf: &stat, rx_len: sizeof(stat)); |
586 | } |
587 | |
588 | static int scpi_dvfs_get_idx(u8 domain) |
589 | { |
590 | int ret; |
591 | u8 dvfs_idx; |
592 | |
593 | ret = scpi_send_message(idx: CMD_GET_DVFS, tx_buf: &domain, tx_len: sizeof(domain), |
594 | rx_buf: &dvfs_idx, rx_len: sizeof(dvfs_idx)); |
595 | |
596 | return ret ? ret : dvfs_idx; |
597 | } |
598 | |
599 | static int scpi_dvfs_set_idx(u8 domain, u8 index) |
600 | { |
601 | int stat; |
602 | struct dvfs_set dvfs = {domain, index}; |
603 | |
604 | return scpi_send_message(idx: CMD_SET_DVFS, tx_buf: &dvfs, tx_len: sizeof(dvfs), |
605 | rx_buf: &stat, rx_len: sizeof(stat)); |
606 | } |
607 | |
608 | static int opp_cmp_func(const void *opp1, const void *opp2) |
609 | { |
610 | const struct scpi_opp *t1 = opp1, *t2 = opp2; |
611 | |
612 | return t1->freq - t2->freq; |
613 | } |
614 | |
615 | static struct scpi_dvfs_info *scpi_dvfs_get_info(u8 domain) |
616 | { |
617 | struct scpi_dvfs_info *info; |
618 | struct scpi_opp *opp; |
619 | struct dvfs_info buf; |
620 | int ret, i; |
621 | |
622 | if (domain >= MAX_DVFS_DOMAINS) |
623 | return ERR_PTR(error: -EINVAL); |
624 | |
625 | if (scpi_info->dvfs[domain]) /* data already populated */ |
626 | return scpi_info->dvfs[domain]; |
627 | |
628 | ret = scpi_send_message(idx: CMD_GET_DVFS_INFO, tx_buf: &domain, tx_len: sizeof(domain), |
629 | rx_buf: &buf, rx_len: sizeof(buf)); |
630 | if (ret) |
631 | return ERR_PTR(error: ret); |
632 | |
633 | info = kmalloc(size: sizeof(*info), GFP_KERNEL); |
634 | if (!info) |
635 | return ERR_PTR(error: -ENOMEM); |
636 | |
637 | info->count = buf.opp_count; |
638 | info->latency = le16_to_cpu(buf.latency) * 1000; /* uS to nS */ |
639 | |
640 | info->opps = kcalloc(n: info->count, size: sizeof(*opp), GFP_KERNEL); |
641 | if (!info->opps) { |
642 | kfree(objp: info); |
643 | return ERR_PTR(error: -ENOMEM); |
644 | } |
645 | |
646 | for (i = 0, opp = info->opps; i < info->count; i++, opp++) { |
647 | opp->freq = le32_to_cpu(buf.opps[i].freq); |
648 | opp->m_volt = le32_to_cpu(buf.opps[i].m_volt); |
649 | } |
650 | |
651 | sort(base: info->opps, num: info->count, size: sizeof(*opp), cmp_func: opp_cmp_func, NULL); |
652 | |
653 | scpi_info->dvfs[domain] = info; |
654 | return info; |
655 | } |
656 | |
657 | static int scpi_dev_domain_id(struct device *dev) |
658 | { |
659 | struct of_phandle_args clkspec; |
660 | |
661 | if (of_parse_phandle_with_args(np: dev->of_node, list_name: "clocks" , cells_name: "#clock-cells" , |
662 | index: 0, out_args: &clkspec)) |
663 | return -EINVAL; |
664 | |
665 | return clkspec.args[0]; |
666 | } |
667 | |
668 | static struct scpi_dvfs_info *scpi_dvfs_info(struct device *dev) |
669 | { |
670 | int domain = scpi_dev_domain_id(dev); |
671 | |
672 | if (domain < 0) |
673 | return ERR_PTR(error: domain); |
674 | |
675 | return scpi_dvfs_get_info(domain); |
676 | } |
677 | |
678 | static int scpi_dvfs_get_transition_latency(struct device *dev) |
679 | { |
680 | struct scpi_dvfs_info *info = scpi_dvfs_info(dev); |
681 | |
682 | if (IS_ERR(ptr: info)) |
683 | return PTR_ERR(ptr: info); |
684 | |
685 | return info->latency; |
686 | } |
687 | |
688 | static int scpi_dvfs_add_opps_to_device(struct device *dev) |
689 | { |
690 | int idx, ret; |
691 | struct scpi_opp *opp; |
692 | struct scpi_dvfs_info *info = scpi_dvfs_info(dev); |
693 | |
694 | if (IS_ERR(ptr: info)) |
695 | return PTR_ERR(ptr: info); |
696 | |
697 | if (!info->opps) |
698 | return -EIO; |
699 | |
700 | for (opp = info->opps, idx = 0; idx < info->count; idx++, opp++) { |
701 | ret = dev_pm_opp_add(dev, freq: opp->freq, u_volt: opp->m_volt * 1000); |
702 | if (ret) { |
703 | dev_warn(dev, "failed to add opp %uHz %umV\n" , |
704 | opp->freq, opp->m_volt); |
705 | while (idx-- > 0) |
706 | dev_pm_opp_remove(dev, freq: (--opp)->freq); |
707 | return ret; |
708 | } |
709 | } |
710 | return 0; |
711 | } |
712 | |
713 | static int scpi_sensor_get_capability(u16 *sensors) |
714 | { |
715 | __le16 cap; |
716 | int ret; |
717 | |
718 | ret = scpi_send_message(idx: CMD_SENSOR_CAPABILITIES, NULL, tx_len: 0, rx_buf: &cap, |
719 | rx_len: sizeof(cap)); |
720 | if (!ret) |
721 | *sensors = le16_to_cpu(cap); |
722 | |
723 | return ret; |
724 | } |
725 | |
726 | static int scpi_sensor_get_info(u16 sensor_id, struct scpi_sensor_info *info) |
727 | { |
728 | __le16 id = cpu_to_le16(sensor_id); |
729 | struct _scpi_sensor_info _info; |
730 | int ret; |
731 | |
732 | ret = scpi_send_message(idx: CMD_SENSOR_INFO, tx_buf: &id, tx_len: sizeof(id), |
733 | rx_buf: &_info, rx_len: sizeof(_info)); |
734 | if (!ret) { |
735 | memcpy(info, &_info, sizeof(*info)); |
736 | info->sensor_id = le16_to_cpu(_info.sensor_id); |
737 | } |
738 | |
739 | return ret; |
740 | } |
741 | |
742 | static int scpi_sensor_get_value(u16 sensor, u64 *val) |
743 | { |
744 | __le16 id = cpu_to_le16(sensor); |
745 | __le64 value; |
746 | int ret; |
747 | |
748 | ret = scpi_send_message(idx: CMD_SENSOR_VALUE, tx_buf: &id, tx_len: sizeof(id), |
749 | rx_buf: &value, rx_len: sizeof(value)); |
750 | if (ret) |
751 | return ret; |
752 | |
753 | if (scpi_info->is_legacy) |
754 | /* only 32-bits supported, upper 32 bits can be junk */ |
755 | *val = le32_to_cpup(p: (__le32 *)&value); |
756 | else |
757 | *val = le64_to_cpu(value); |
758 | |
759 | return 0; |
760 | } |
761 | |
762 | static int scpi_device_get_power_state(u16 dev_id) |
763 | { |
764 | int ret; |
765 | u8 pstate; |
766 | __le16 id = cpu_to_le16(dev_id); |
767 | |
768 | ret = scpi_send_message(idx: CMD_GET_DEVICE_PWR_STATE, tx_buf: &id, |
769 | tx_len: sizeof(id), rx_buf: &pstate, rx_len: sizeof(pstate)); |
770 | return ret ? ret : pstate; |
771 | } |
772 | |
773 | static int scpi_device_set_power_state(u16 dev_id, u8 pstate) |
774 | { |
775 | int stat; |
776 | struct dev_pstate_set dev_set = { |
777 | .dev_id = cpu_to_le16(dev_id), |
778 | .pstate = pstate, |
779 | }; |
780 | |
781 | return scpi_send_message(idx: CMD_SET_DEVICE_PWR_STATE, tx_buf: &dev_set, |
782 | tx_len: sizeof(dev_set), rx_buf: &stat, rx_len: sizeof(stat)); |
783 | } |
784 | |
785 | static struct scpi_ops scpi_ops = { |
786 | .get_version = scpi_get_version, |
787 | .clk_get_range = scpi_clk_get_range, |
788 | .clk_get_val = scpi_clk_get_val, |
789 | .clk_set_val = scpi_clk_set_val, |
790 | .dvfs_get_idx = scpi_dvfs_get_idx, |
791 | .dvfs_set_idx = scpi_dvfs_set_idx, |
792 | .dvfs_get_info = scpi_dvfs_get_info, |
793 | .device_domain_id = scpi_dev_domain_id, |
794 | .get_transition_latency = scpi_dvfs_get_transition_latency, |
795 | .add_opps_to_device = scpi_dvfs_add_opps_to_device, |
796 | .sensor_get_capability = scpi_sensor_get_capability, |
797 | .sensor_get_info = scpi_sensor_get_info, |
798 | .sensor_get_value = scpi_sensor_get_value, |
799 | .device_get_power_state = scpi_device_get_power_state, |
800 | .device_set_power_state = scpi_device_set_power_state, |
801 | }; |
802 | |
803 | struct scpi_ops *get_scpi_ops(void) |
804 | { |
805 | return scpi_info ? scpi_info->scpi_ops : NULL; |
806 | } |
807 | EXPORT_SYMBOL_GPL(get_scpi_ops); |
808 | |
809 | static int scpi_init_versions(struct scpi_drvinfo *info) |
810 | { |
811 | int ret; |
812 | struct scp_capabilities caps; |
813 | |
814 | ret = scpi_send_message(idx: CMD_SCPI_CAPABILITIES, NULL, tx_len: 0, |
815 | rx_buf: &caps, rx_len: sizeof(caps)); |
816 | if (!ret) { |
817 | info->protocol_version = le32_to_cpu(caps.protocol_version); |
818 | info->firmware_version = le32_to_cpu(caps.platform_version); |
819 | } |
820 | /* Ignore error if not implemented */ |
821 | if (info->is_legacy && ret == -EOPNOTSUPP) |
822 | return 0; |
823 | |
824 | return ret; |
825 | } |
826 | |
827 | static ssize_t protocol_version_show(struct device *dev, |
828 | struct device_attribute *attr, char *buf) |
829 | { |
830 | struct scpi_drvinfo *scpi_info = dev_get_drvdata(dev); |
831 | |
832 | return sprintf(buf, fmt: "%lu.%lu\n" , |
833 | FIELD_GET(PROTO_REV_MAJOR_MASK, scpi_info->protocol_version), |
834 | FIELD_GET(PROTO_REV_MINOR_MASK, scpi_info->protocol_version)); |
835 | } |
836 | static DEVICE_ATTR_RO(protocol_version); |
837 | |
838 | static ssize_t firmware_version_show(struct device *dev, |
839 | struct device_attribute *attr, char *buf) |
840 | { |
841 | struct scpi_drvinfo *scpi_info = dev_get_drvdata(dev); |
842 | |
843 | return sprintf(buf, fmt: "%lu.%lu.%lu\n" , |
844 | FIELD_GET(FW_REV_MAJOR_MASK, scpi_info->firmware_version), |
845 | FIELD_GET(FW_REV_MINOR_MASK, scpi_info->firmware_version), |
846 | FIELD_GET(FW_REV_PATCH_MASK, scpi_info->firmware_version)); |
847 | } |
848 | static DEVICE_ATTR_RO(firmware_version); |
849 | |
850 | static struct attribute *versions_attrs[] = { |
851 | &dev_attr_firmware_version.attr, |
852 | &dev_attr_protocol_version.attr, |
853 | NULL, |
854 | }; |
855 | ATTRIBUTE_GROUPS(versions); |
856 | |
857 | static void scpi_free_channels(void *data) |
858 | { |
859 | struct scpi_drvinfo *info = data; |
860 | int i; |
861 | |
862 | for (i = 0; i < info->num_chans; i++) |
863 | mbox_free_channel(chan: info->channels[i].chan); |
864 | } |
865 | |
866 | static void scpi_remove(struct platform_device *pdev) |
867 | { |
868 | int i; |
869 | struct scpi_drvinfo *info = platform_get_drvdata(pdev); |
870 | |
871 | scpi_info = NULL; /* stop exporting SCPI ops through get_scpi_ops */ |
872 | |
873 | for (i = 0; i < MAX_DVFS_DOMAINS && info->dvfs[i]; i++) { |
874 | kfree(objp: info->dvfs[i]->opps); |
875 | kfree(objp: info->dvfs[i]); |
876 | } |
877 | } |
878 | |
879 | #define MAX_SCPI_XFERS 10 |
880 | static int scpi_alloc_xfer_list(struct device *dev, struct scpi_chan *ch) |
881 | { |
882 | int i; |
883 | struct scpi_xfer *xfers; |
884 | |
885 | xfers = devm_kcalloc(dev, MAX_SCPI_XFERS, size: sizeof(*xfers), GFP_KERNEL); |
886 | if (!xfers) |
887 | return -ENOMEM; |
888 | |
889 | ch->xfers = xfers; |
890 | for (i = 0; i < MAX_SCPI_XFERS; i++, xfers++) { |
891 | init_completion(x: &xfers->done); |
892 | list_add_tail(new: &xfers->node, head: &ch->xfers_list); |
893 | } |
894 | |
895 | return 0; |
896 | } |
897 | |
898 | static const struct of_device_id shmem_of_match[] __maybe_unused = { |
899 | { .compatible = "amlogic,meson-gxbb-scp-shmem" , }, |
900 | { .compatible = "amlogic,meson-axg-scp-shmem" , }, |
901 | { .compatible = "arm,juno-scp-shmem" , }, |
902 | { .compatible = "arm,scp-shmem" , }, |
903 | { } |
904 | }; |
905 | |
906 | static int scpi_probe(struct platform_device *pdev) |
907 | { |
908 | int count, idx, ret; |
909 | struct resource res; |
910 | struct device *dev = &pdev->dev; |
911 | struct device_node *np = dev->of_node; |
912 | struct scpi_drvinfo *scpi_drvinfo; |
913 | |
914 | scpi_drvinfo = devm_kzalloc(dev, size: sizeof(*scpi_drvinfo), GFP_KERNEL); |
915 | if (!scpi_drvinfo) |
916 | return -ENOMEM; |
917 | |
918 | scpi_drvinfo->is_legacy = !!device_get_match_data(dev); |
919 | |
920 | count = of_count_phandle_with_args(np, list_name: "mboxes" , cells_name: "#mbox-cells" ); |
921 | if (count < 0) { |
922 | dev_err(dev, "no mboxes property in '%pOF'\n" , np); |
923 | return -ENODEV; |
924 | } |
925 | |
926 | scpi_drvinfo->channels = |
927 | devm_kcalloc(dev, n: count, size: sizeof(struct scpi_chan), GFP_KERNEL); |
928 | if (!scpi_drvinfo->channels) |
929 | return -ENOMEM; |
930 | |
931 | ret = devm_add_action(dev, scpi_free_channels, scpi_drvinfo); |
932 | if (ret) |
933 | return ret; |
934 | |
935 | for (; scpi_drvinfo->num_chans < count; scpi_drvinfo->num_chans++) { |
936 | resource_size_t size; |
937 | int idx = scpi_drvinfo->num_chans; |
938 | struct scpi_chan *pchan = scpi_drvinfo->channels + idx; |
939 | struct mbox_client *cl = &pchan->cl; |
940 | struct device_node *shmem = of_parse_phandle(np, phandle_name: "shmem" , index: idx); |
941 | |
942 | if (!of_match_node(matches: shmem_of_match, node: shmem)) |
943 | return -ENXIO; |
944 | |
945 | ret = of_address_to_resource(dev: shmem, index: 0, r: &res); |
946 | of_node_put(node: shmem); |
947 | if (ret) { |
948 | dev_err(dev, "failed to get SCPI payload mem resource\n" ); |
949 | return ret; |
950 | } |
951 | |
952 | size = resource_size(res: &res); |
953 | pchan->rx_payload = devm_ioremap(dev, offset: res.start, size); |
954 | if (!pchan->rx_payload) { |
955 | dev_err(dev, "failed to ioremap SCPI payload\n" ); |
956 | return -EADDRNOTAVAIL; |
957 | } |
958 | pchan->tx_payload = pchan->rx_payload + (size >> 1); |
959 | |
960 | cl->dev = dev; |
961 | cl->rx_callback = scpi_handle_remote_msg; |
962 | cl->tx_prepare = scpi_tx_prepare; |
963 | cl->tx_block = true; |
964 | cl->tx_tout = 20; |
965 | cl->knows_txdone = false; /* controller can't ack */ |
966 | |
967 | INIT_LIST_HEAD(list: &pchan->rx_pending); |
968 | INIT_LIST_HEAD(list: &pchan->xfers_list); |
969 | spin_lock_init(&pchan->rx_lock); |
970 | mutex_init(&pchan->xfers_lock); |
971 | |
972 | ret = scpi_alloc_xfer_list(dev, ch: pchan); |
973 | if (!ret) { |
974 | pchan->chan = mbox_request_channel(cl, index: idx); |
975 | if (!IS_ERR(ptr: pchan->chan)) |
976 | continue; |
977 | ret = PTR_ERR(ptr: pchan->chan); |
978 | if (ret != -EPROBE_DEFER) |
979 | dev_err(dev, "failed to get channel%d err %d\n" , |
980 | idx, ret); |
981 | } |
982 | return ret; |
983 | } |
984 | |
985 | scpi_drvinfo->commands = scpi_std_commands; |
986 | |
987 | platform_set_drvdata(pdev, data: scpi_drvinfo); |
988 | |
989 | if (scpi_drvinfo->is_legacy) { |
990 | /* Replace with legacy variants */ |
991 | scpi_ops.clk_set_val = legacy_scpi_clk_set_val; |
992 | scpi_drvinfo->commands = scpi_legacy_commands; |
993 | |
994 | /* Fill priority bitmap */ |
995 | for (idx = 0; idx < ARRAY_SIZE(legacy_hpriority_cmds); idx++) |
996 | set_bit(nr: legacy_hpriority_cmds[idx], |
997 | addr: scpi_drvinfo->cmd_priority); |
998 | } |
999 | |
1000 | scpi_info = scpi_drvinfo; |
1001 | |
1002 | ret = scpi_init_versions(info: scpi_drvinfo); |
1003 | if (ret) { |
1004 | dev_err(dev, "incorrect or no SCP firmware found\n" ); |
1005 | scpi_info = NULL; |
1006 | return ret; |
1007 | } |
1008 | |
1009 | if (scpi_drvinfo->is_legacy && !scpi_drvinfo->protocol_version && |
1010 | !scpi_drvinfo->firmware_version) |
1011 | dev_info(dev, "SCP Protocol legacy pre-1.0 firmware\n" ); |
1012 | else |
1013 | dev_info(dev, "SCP Protocol %lu.%lu Firmware %lu.%lu.%lu version\n" , |
1014 | FIELD_GET(PROTO_REV_MAJOR_MASK, |
1015 | scpi_drvinfo->protocol_version), |
1016 | FIELD_GET(PROTO_REV_MINOR_MASK, |
1017 | scpi_drvinfo->protocol_version), |
1018 | FIELD_GET(FW_REV_MAJOR_MASK, |
1019 | scpi_drvinfo->firmware_version), |
1020 | FIELD_GET(FW_REV_MINOR_MASK, |
1021 | scpi_drvinfo->firmware_version), |
1022 | FIELD_GET(FW_REV_PATCH_MASK, |
1023 | scpi_drvinfo->firmware_version)); |
1024 | |
1025 | scpi_drvinfo->scpi_ops = &scpi_ops; |
1026 | |
1027 | ret = devm_of_platform_populate(dev); |
1028 | if (ret) |
1029 | scpi_info = NULL; |
1030 | |
1031 | return ret; |
1032 | } |
1033 | |
1034 | static const struct of_device_id scpi_of_match[] = { |
1035 | {.compatible = "arm,scpi" }, |
1036 | {.compatible = "arm,scpi-pre-1.0" , .data = (void *)1UL }, |
1037 | {}, |
1038 | }; |
1039 | |
1040 | MODULE_DEVICE_TABLE(of, scpi_of_match); |
1041 | |
1042 | static struct platform_driver scpi_driver = { |
1043 | .driver = { |
1044 | .name = "scpi_protocol" , |
1045 | .of_match_table = scpi_of_match, |
1046 | .dev_groups = versions_groups, |
1047 | }, |
1048 | .probe = scpi_probe, |
1049 | .remove_new = scpi_remove, |
1050 | }; |
1051 | module_platform_driver(scpi_driver); |
1052 | |
1053 | MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>" ); |
1054 | MODULE_DESCRIPTION("ARM SCPI mailbox protocol driver" ); |
1055 | MODULE_LICENSE("GPL v2" ); |
1056 | |