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8cb7cf56 SH |
1 | /* |
2 | * System Control and Power Interface (SCPI) Message Protocol driver | |
3 | * | |
4 | * SCPI Message Protocol is used between the System Control Processor(SCP) | |
5 | * and the Application Processors(AP). The Message Handling Unit(MHU) | |
6 | * provides a mechanism for inter-processor communication between SCP's | |
7 | * Cortex M3 and AP. | |
8 | * | |
9 | * SCP offers control and management of the core/cluster power states, | |
10 | * various power domain DVFS including the core/cluster, certain system | |
11 | * clocks configuration, thermal sensors and many others. | |
12 | * | |
13 | * Copyright (C) 2015 ARM Ltd. | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify it | |
16 | * under the terms and conditions of the GNU General Public License, | |
17 | * version 2, as published by the Free Software Foundation. | |
18 | * | |
19 | * This program is distributed in the hope it will be useful, but WITHOUT | |
20 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
21 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
22 | * more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License along | |
25 | * with this program. If not, see <http://www.gnu.org/licenses/>. | |
26 | */ | |
27 | ||
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
29 | ||
30 | #include <linux/bitmap.h> | |
7cd49a26 | 31 | #include <linux/bitfield.h> |
8cb7cf56 SH |
32 | #include <linux/device.h> |
33 | #include <linux/err.h> | |
34 | #include <linux/export.h> | |
35 | #include <linux/io.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/list.h> | |
38 | #include <linux/mailbox_client.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/of_address.h> | |
41 | #include <linux/of_platform.h> | |
42 | #include <linux/printk.h> | |
45ca7df7 | 43 | #include <linux/pm_opp.h> |
8cb7cf56 SH |
44 | #include <linux/scpi_protocol.h> |
45 | #include <linux/slab.h> | |
46 | #include <linux/sort.h> | |
47 | #include <linux/spinlock.h> | |
48 | ||
96fe77b6 HK |
49 | #define CMD_ID_MASK GENMASK(6, 0) |
50 | #define CMD_TOKEN_ID_MASK GENMASK(15, 8) | |
51 | #define CMD_DATA_SIZE_MASK GENMASK(24, 16) | |
52 | #define CMD_LEGACY_DATA_SIZE_MASK GENMASK(28, 20) | |
53 | #define PACK_SCPI_CMD(cmd_id, tx_sz) \ | |
54 | (FIELD_PREP(CMD_ID_MASK, cmd_id) | \ | |
55 | FIELD_PREP(CMD_DATA_SIZE_MASK, tx_sz)) | |
56 | #define PACK_LEGACY_SCPI_CMD(cmd_id, tx_sz) \ | |
57 | (FIELD_PREP(CMD_ID_MASK, cmd_id) | \ | |
58 | FIELD_PREP(CMD_LEGACY_DATA_SIZE_MASK, tx_sz)) | |
59 | ||
60 | #define CMD_SIZE(cmd) FIELD_GET(CMD_DATA_SIZE_MASK, cmd) | |
61 | #define CMD_UNIQ_MASK (CMD_TOKEN_ID_MASK | CMD_ID_MASK) | |
8cb7cf56 SH |
62 | #define CMD_XTRACT_UNIQ(cmd) ((cmd) & CMD_UNIQ_MASK) |
63 | ||
64 | #define SCPI_SLOT 0 | |
65 | ||
66 | #define MAX_DVFS_DOMAINS 8 | |
bb789cd1 | 67 | #define MAX_DVFS_OPPS 16 |
81faa556 | 68 | |
7cd49a26 HK |
69 | #define PROTO_REV_MAJOR_MASK GENMASK(31, 16) |
70 | #define PROTO_REV_MINOR_MASK GENMASK(15, 0) | |
81faa556 | 71 | |
7cd49a26 HK |
72 | #define FW_REV_MAJOR_MASK GENMASK(31, 24) |
73 | #define FW_REV_MINOR_MASK GENMASK(23, 16) | |
74 | #define FW_REV_PATCH_MASK GENMASK(15, 0) | |
8cb7cf56 | 75 | |
3bdd8843 | 76 | #define MAX_RX_TIMEOUT (msecs_to_jiffies(30)) |
8cb7cf56 SH |
77 | |
78 | enum scpi_error_codes { | |
79 | SCPI_SUCCESS = 0, /* Success */ | |
80 | SCPI_ERR_PARAM = 1, /* Invalid parameter(s) */ | |
81 | SCPI_ERR_ALIGN = 2, /* Invalid alignment */ | |
82 | SCPI_ERR_SIZE = 3, /* Invalid size */ | |
83 | SCPI_ERR_HANDLER = 4, /* Invalid handler/callback */ | |
84 | SCPI_ERR_ACCESS = 5, /* Invalid access/permission denied */ | |
85 | SCPI_ERR_RANGE = 6, /* Value out of range */ | |
86 | SCPI_ERR_TIMEOUT = 7, /* Timeout has occurred */ | |
87 | SCPI_ERR_NOMEM = 8, /* Invalid memory area or pointer */ | |
88 | SCPI_ERR_PWRSTATE = 9, /* Invalid power state */ | |
89 | SCPI_ERR_SUPPORT = 10, /* Not supported or disabled */ | |
90 | SCPI_ERR_DEVICE = 11, /* Device error */ | |
91 | SCPI_ERR_BUSY = 12, /* Device busy */ | |
92 | SCPI_ERR_MAX | |
93 | }; | |
94 | ||
761d0efe | 95 | /* SCPI Standard commands */ |
8cb7cf56 SH |
96 | enum scpi_std_cmd { |
97 | SCPI_CMD_INVALID = 0x00, | |
98 | SCPI_CMD_SCPI_READY = 0x01, | |
99 | SCPI_CMD_SCPI_CAPABILITIES = 0x02, | |
100 | SCPI_CMD_SET_CSS_PWR_STATE = 0x03, | |
101 | SCPI_CMD_GET_CSS_PWR_STATE = 0x04, | |
102 | SCPI_CMD_SET_SYS_PWR_STATE = 0x05, | |
103 | SCPI_CMD_SET_CPU_TIMER = 0x06, | |
104 | SCPI_CMD_CANCEL_CPU_TIMER = 0x07, | |
105 | SCPI_CMD_DVFS_CAPABILITIES = 0x08, | |
106 | SCPI_CMD_GET_DVFS_INFO = 0x09, | |
107 | SCPI_CMD_SET_DVFS = 0x0a, | |
108 | SCPI_CMD_GET_DVFS = 0x0b, | |
109 | SCPI_CMD_GET_DVFS_STAT = 0x0c, | |
110 | SCPI_CMD_CLOCK_CAPABILITIES = 0x0d, | |
111 | SCPI_CMD_GET_CLOCK_INFO = 0x0e, | |
112 | SCPI_CMD_SET_CLOCK_VALUE = 0x0f, | |
113 | SCPI_CMD_GET_CLOCK_VALUE = 0x10, | |
114 | SCPI_CMD_PSU_CAPABILITIES = 0x11, | |
115 | SCPI_CMD_GET_PSU_INFO = 0x12, | |
116 | SCPI_CMD_SET_PSU = 0x13, | |
117 | SCPI_CMD_GET_PSU = 0x14, | |
118 | SCPI_CMD_SENSOR_CAPABILITIES = 0x15, | |
119 | SCPI_CMD_SENSOR_INFO = 0x16, | |
120 | SCPI_CMD_SENSOR_VALUE = 0x17, | |
121 | SCPI_CMD_SENSOR_CFG_PERIODIC = 0x18, | |
122 | SCPI_CMD_SENSOR_CFG_BOUNDS = 0x19, | |
123 | SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1a, | |
124 | SCPI_CMD_SET_DEVICE_PWR_STATE = 0x1b, | |
125 | SCPI_CMD_GET_DEVICE_PWR_STATE = 0x1c, | |
126 | SCPI_CMD_COUNT | |
127 | }; | |
128 | ||
4dfe32d5 NA |
129 | /* SCPI Legacy Commands */ |
130 | enum legacy_scpi_std_cmd { | |
131 | LEGACY_SCPI_CMD_INVALID = 0x00, | |
132 | LEGACY_SCPI_CMD_SCPI_READY = 0x01, | |
133 | LEGACY_SCPI_CMD_SCPI_CAPABILITIES = 0x02, | |
134 | LEGACY_SCPI_CMD_EVENT = 0x03, | |
135 | LEGACY_SCPI_CMD_SET_CSS_PWR_STATE = 0x04, | |
136 | LEGACY_SCPI_CMD_GET_CSS_PWR_STATE = 0x05, | |
137 | LEGACY_SCPI_CMD_CFG_PWR_STATE_STAT = 0x06, | |
138 | LEGACY_SCPI_CMD_GET_PWR_STATE_STAT = 0x07, | |
139 | LEGACY_SCPI_CMD_SYS_PWR_STATE = 0x08, | |
140 | LEGACY_SCPI_CMD_L2_READY = 0x09, | |
141 | LEGACY_SCPI_CMD_SET_AP_TIMER = 0x0a, | |
142 | LEGACY_SCPI_CMD_CANCEL_AP_TIME = 0x0b, | |
143 | LEGACY_SCPI_CMD_DVFS_CAPABILITIES = 0x0c, | |
144 | LEGACY_SCPI_CMD_GET_DVFS_INFO = 0x0d, | |
145 | LEGACY_SCPI_CMD_SET_DVFS = 0x0e, | |
146 | LEGACY_SCPI_CMD_GET_DVFS = 0x0f, | |
147 | LEGACY_SCPI_CMD_GET_DVFS_STAT = 0x10, | |
148 | LEGACY_SCPI_CMD_SET_RTC = 0x11, | |
149 | LEGACY_SCPI_CMD_GET_RTC = 0x12, | |
150 | LEGACY_SCPI_CMD_CLOCK_CAPABILITIES = 0x13, | |
151 | LEGACY_SCPI_CMD_SET_CLOCK_INDEX = 0x14, | |
152 | LEGACY_SCPI_CMD_SET_CLOCK_VALUE = 0x15, | |
153 | LEGACY_SCPI_CMD_GET_CLOCK_VALUE = 0x16, | |
154 | LEGACY_SCPI_CMD_PSU_CAPABILITIES = 0x17, | |
155 | LEGACY_SCPI_CMD_SET_PSU = 0x18, | |
156 | LEGACY_SCPI_CMD_GET_PSU = 0x19, | |
157 | LEGACY_SCPI_CMD_SENSOR_CAPABILITIES = 0x1a, | |
158 | LEGACY_SCPI_CMD_SENSOR_INFO = 0x1b, | |
159 | LEGACY_SCPI_CMD_SENSOR_VALUE = 0x1c, | |
160 | LEGACY_SCPI_CMD_SENSOR_CFG_PERIODIC = 0x1d, | |
161 | LEGACY_SCPI_CMD_SENSOR_CFG_BOUNDS = 0x1e, | |
162 | LEGACY_SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1f, | |
163 | LEGACY_SCPI_CMD_COUNT | |
164 | }; | |
165 | ||
166 | /* List all commands that are required to go through the high priority link */ | |
167 | static int legacy_hpriority_cmds[] = { | |
168 | LEGACY_SCPI_CMD_GET_CSS_PWR_STATE, | |
169 | LEGACY_SCPI_CMD_CFG_PWR_STATE_STAT, | |
170 | LEGACY_SCPI_CMD_GET_PWR_STATE_STAT, | |
171 | LEGACY_SCPI_CMD_SET_DVFS, | |
172 | LEGACY_SCPI_CMD_GET_DVFS, | |
173 | LEGACY_SCPI_CMD_SET_RTC, | |
174 | LEGACY_SCPI_CMD_GET_RTC, | |
175 | LEGACY_SCPI_CMD_SET_CLOCK_INDEX, | |
176 | LEGACY_SCPI_CMD_SET_CLOCK_VALUE, | |
177 | LEGACY_SCPI_CMD_GET_CLOCK_VALUE, | |
178 | LEGACY_SCPI_CMD_SET_PSU, | |
179 | LEGACY_SCPI_CMD_GET_PSU, | |
180 | LEGACY_SCPI_CMD_SENSOR_CFG_PERIODIC, | |
181 | LEGACY_SCPI_CMD_SENSOR_CFG_BOUNDS, | |
182 | }; | |
183 | ||
184 | /* List all commands used by this driver, used as indexes */ | |
761d0efe SH |
185 | enum scpi_drv_cmds { |
186 | CMD_SCPI_CAPABILITIES = 0, | |
187 | CMD_GET_CLOCK_INFO, | |
188 | CMD_GET_CLOCK_VALUE, | |
189 | CMD_SET_CLOCK_VALUE, | |
190 | CMD_GET_DVFS, | |
191 | CMD_SET_DVFS, | |
192 | CMD_GET_DVFS_INFO, | |
193 | CMD_SENSOR_CAPABILITIES, | |
194 | CMD_SENSOR_INFO, | |
195 | CMD_SENSOR_VALUE, | |
196 | CMD_SET_DEVICE_PWR_STATE, | |
197 | CMD_GET_DEVICE_PWR_STATE, | |
198 | CMD_MAX_COUNT, | |
199 | }; | |
200 | ||
201 | static int scpi_std_commands[CMD_MAX_COUNT] = { | |
202 | SCPI_CMD_SCPI_CAPABILITIES, | |
203 | SCPI_CMD_GET_CLOCK_INFO, | |
204 | SCPI_CMD_GET_CLOCK_VALUE, | |
205 | SCPI_CMD_SET_CLOCK_VALUE, | |
206 | SCPI_CMD_GET_DVFS, | |
207 | SCPI_CMD_SET_DVFS, | |
208 | SCPI_CMD_GET_DVFS_INFO, | |
209 | SCPI_CMD_SENSOR_CAPABILITIES, | |
210 | SCPI_CMD_SENSOR_INFO, | |
211 | SCPI_CMD_SENSOR_VALUE, | |
212 | SCPI_CMD_SET_DEVICE_PWR_STATE, | |
213 | SCPI_CMD_GET_DEVICE_PWR_STATE, | |
214 | }; | |
215 | ||
4dfe32d5 NA |
216 | static int scpi_legacy_commands[CMD_MAX_COUNT] = { |
217 | LEGACY_SCPI_CMD_SCPI_CAPABILITIES, | |
218 | -1, /* GET_CLOCK_INFO */ | |
219 | LEGACY_SCPI_CMD_GET_CLOCK_VALUE, | |
220 | LEGACY_SCPI_CMD_SET_CLOCK_VALUE, | |
221 | LEGACY_SCPI_CMD_GET_DVFS, | |
222 | LEGACY_SCPI_CMD_SET_DVFS, | |
223 | LEGACY_SCPI_CMD_GET_DVFS_INFO, | |
224 | LEGACY_SCPI_CMD_SENSOR_CAPABILITIES, | |
225 | LEGACY_SCPI_CMD_SENSOR_INFO, | |
226 | LEGACY_SCPI_CMD_SENSOR_VALUE, | |
227 | -1, /* SET_DEVICE_PWR_STATE */ | |
228 | -1, /* GET_DEVICE_PWR_STATE */ | |
229 | }; | |
230 | ||
8cb7cf56 SH |
231 | struct scpi_xfer { |
232 | u32 slot; /* has to be first element */ | |
233 | u32 cmd; | |
234 | u32 status; | |
235 | const void *tx_buf; | |
236 | void *rx_buf; | |
237 | unsigned int tx_len; | |
238 | unsigned int rx_len; | |
239 | struct list_head node; | |
240 | struct completion done; | |
241 | }; | |
242 | ||
243 | struct scpi_chan { | |
244 | struct mbox_client cl; | |
245 | struct mbox_chan *chan; | |
246 | void __iomem *tx_payload; | |
247 | void __iomem *rx_payload; | |
248 | struct list_head rx_pending; | |
249 | struct list_head xfers_list; | |
250 | struct scpi_xfer *xfers; | |
251 | spinlock_t rx_lock; /* locking for the rx pending list */ | |
252 | struct mutex xfers_lock; | |
253 | u8 token; | |
254 | }; | |
255 | ||
256 | struct scpi_drvinfo { | |
257 | u32 protocol_version; | |
258 | u32 firmware_version; | |
4dfe32d5 | 259 | bool is_legacy; |
8cb7cf56 | 260 | int num_chans; |
761d0efe | 261 | int *commands; |
4dfe32d5 | 262 | DECLARE_BITMAP(cmd_priority, LEGACY_SCPI_CMD_COUNT); |
8cb7cf56 SH |
263 | atomic_t next_chan; |
264 | struct scpi_ops *scpi_ops; | |
265 | struct scpi_chan *channels; | |
266 | struct scpi_dvfs_info *dvfs[MAX_DVFS_DOMAINS]; | |
267 | }; | |
268 | ||
269 | /* | |
270 | * The SCP firmware only executes in little-endian mode, so any buffers | |
271 | * shared through SCPI should have their contents converted to little-endian | |
272 | */ | |
273 | struct scpi_shared_mem { | |
274 | __le32 command; | |
275 | __le32 status; | |
276 | u8 payload[0]; | |
277 | } __packed; | |
278 | ||
4dfe32d5 NA |
279 | struct legacy_scpi_shared_mem { |
280 | __le32 status; | |
281 | u8 payload[0]; | |
282 | } __packed; | |
283 | ||
8cb7cf56 SH |
284 | struct scp_capabilities { |
285 | __le32 protocol_version; | |
286 | __le32 event_version; | |
287 | __le32 platform_version; | |
288 | __le32 commands[4]; | |
289 | } __packed; | |
290 | ||
291 | struct clk_get_info { | |
292 | __le16 id; | |
293 | __le16 flags; | |
294 | __le32 min_rate; | |
295 | __le32 max_rate; | |
296 | u8 name[20]; | |
297 | } __packed; | |
298 | ||
8cb7cf56 SH |
299 | struct clk_set_value { |
300 | __le16 id; | |
301 | __le16 reserved; | |
302 | __le32 rate; | |
303 | } __packed; | |
304 | ||
4dfe32d5 NA |
305 | struct legacy_clk_set_value { |
306 | __le32 rate; | |
307 | __le16 id; | |
308 | __le16 reserved; | |
309 | } __packed; | |
310 | ||
8cb7cf56 | 311 | struct dvfs_info { |
a963d7c5 HK |
312 | u8 domain; |
313 | u8 opp_count; | |
314 | __le16 latency; | |
8cb7cf56 SH |
315 | struct { |
316 | __le32 freq; | |
317 | __le32 m_volt; | |
318 | } opps[MAX_DVFS_OPPS]; | |
319 | } __packed; | |
320 | ||
8cb7cf56 SH |
321 | struct dvfs_set { |
322 | u8 domain; | |
323 | u8 index; | |
324 | } __packed; | |
325 | ||
38a1bdc9 PA |
326 | struct _scpi_sensor_info { |
327 | __le16 sensor_id; | |
328 | u8 class; | |
329 | u8 trigger_type; | |
330 | char name[20]; | |
331 | }; | |
332 | ||
37a441dc | 333 | struct dev_pstate_set { |
0d301768 | 334 | __le16 dev_id; |
37a441dc SH |
335 | u8 pstate; |
336 | } __packed; | |
337 | ||
8cb7cf56 SH |
338 | static struct scpi_drvinfo *scpi_info; |
339 | ||
340 | static int scpi_linux_errmap[SCPI_ERR_MAX] = { | |
341 | /* better than switch case as long as return value is continuous */ | |
342 | 0, /* SCPI_SUCCESS */ | |
343 | -EINVAL, /* SCPI_ERR_PARAM */ | |
344 | -ENOEXEC, /* SCPI_ERR_ALIGN */ | |
345 | -EMSGSIZE, /* SCPI_ERR_SIZE */ | |
346 | -EINVAL, /* SCPI_ERR_HANDLER */ | |
347 | -EACCES, /* SCPI_ERR_ACCESS */ | |
348 | -ERANGE, /* SCPI_ERR_RANGE */ | |
349 | -ETIMEDOUT, /* SCPI_ERR_TIMEOUT */ | |
350 | -ENOMEM, /* SCPI_ERR_NOMEM */ | |
351 | -EINVAL, /* SCPI_ERR_PWRSTATE */ | |
352 | -EOPNOTSUPP, /* SCPI_ERR_SUPPORT */ | |
353 | -EIO, /* SCPI_ERR_DEVICE */ | |
354 | -EBUSY, /* SCPI_ERR_BUSY */ | |
355 | }; | |
356 | ||
357 | static inline int scpi_to_linux_errno(int errno) | |
358 | { | |
359 | if (errno >= SCPI_SUCCESS && errno < SCPI_ERR_MAX) | |
360 | return scpi_linux_errmap[errno]; | |
361 | return -EIO; | |
362 | } | |
363 | ||
364 | static void scpi_process_cmd(struct scpi_chan *ch, u32 cmd) | |
365 | { | |
366 | unsigned long flags; | |
367 | struct scpi_xfer *t, *match = NULL; | |
368 | ||
369 | spin_lock_irqsave(&ch->rx_lock, flags); | |
370 | if (list_empty(&ch->rx_pending)) { | |
371 | spin_unlock_irqrestore(&ch->rx_lock, flags); | |
372 | return; | |
373 | } | |
374 | ||
4dfe32d5 NA |
375 | /* Command type is not replied by the SCP Firmware in legacy Mode |
376 | * We should consider that command is the head of pending RX commands | |
377 | * if the list is not empty. In TX only mode, the list would be empty. | |
378 | */ | |
379 | if (scpi_info->is_legacy) { | |
380 | match = list_first_entry(&ch->rx_pending, struct scpi_xfer, | |
381 | node); | |
382 | list_del(&match->node); | |
383 | } else { | |
384 | list_for_each_entry(t, &ch->rx_pending, node) | |
385 | if (CMD_XTRACT_UNIQ(t->cmd) == CMD_XTRACT_UNIQ(cmd)) { | |
386 | list_del(&t->node); | |
387 | match = t; | |
388 | break; | |
389 | } | |
390 | } | |
8cb7cf56 SH |
391 | /* check if wait_for_completion is in progress or timed-out */ |
392 | if (match && !completion_done(&match->done)) { | |
4dfe32d5 NA |
393 | unsigned int len; |
394 | ||
395 | if (scpi_info->is_legacy) { | |
5204abd3 HK |
396 | struct legacy_scpi_shared_mem __iomem *mem = |
397 | ch->rx_payload; | |
4dfe32d5 NA |
398 | |
399 | /* RX Length is not replied by the legacy Firmware */ | |
400 | len = match->rx_len; | |
401 | ||
5204abd3 | 402 | match->status = ioread32(&mem->status); |
4dfe32d5 NA |
403 | memcpy_fromio(match->rx_buf, mem->payload, len); |
404 | } else { | |
5204abd3 | 405 | struct scpi_shared_mem __iomem *mem = ch->rx_payload; |
4dfe32d5 | 406 | |
96fe77b6 | 407 | len = min_t(unsigned int, match->rx_len, CMD_SIZE(cmd)); |
4dfe32d5 | 408 | |
5204abd3 | 409 | match->status = ioread32(&mem->status); |
4dfe32d5 NA |
410 | memcpy_fromio(match->rx_buf, mem->payload, len); |
411 | } | |
8cb7cf56 | 412 | |
8cb7cf56 SH |
413 | if (match->rx_len > len) |
414 | memset(match->rx_buf + len, 0, match->rx_len - len); | |
415 | complete(&match->done); | |
416 | } | |
417 | spin_unlock_irqrestore(&ch->rx_lock, flags); | |
418 | } | |
419 | ||
420 | static void scpi_handle_remote_msg(struct mbox_client *c, void *msg) | |
421 | { | |
422 | struct scpi_chan *ch = container_of(c, struct scpi_chan, cl); | |
5204abd3 | 423 | struct scpi_shared_mem __iomem *mem = ch->rx_payload; |
4dfe32d5 NA |
424 | u32 cmd = 0; |
425 | ||
426 | if (!scpi_info->is_legacy) | |
5204abd3 | 427 | cmd = ioread32(&mem->command); |
8cb7cf56 SH |
428 | |
429 | scpi_process_cmd(ch, cmd); | |
430 | } | |
431 | ||
432 | static void scpi_tx_prepare(struct mbox_client *c, void *msg) | |
433 | { | |
434 | unsigned long flags; | |
435 | struct scpi_xfer *t = msg; | |
436 | struct scpi_chan *ch = container_of(c, struct scpi_chan, cl); | |
5204abd3 | 437 | struct scpi_shared_mem __iomem *mem = ch->tx_payload; |
8cb7cf56 | 438 | |
4dfe32d5 NA |
439 | if (t->tx_buf) { |
440 | if (scpi_info->is_legacy) | |
441 | memcpy_toio(ch->tx_payload, t->tx_buf, t->tx_len); | |
442 | else | |
443 | memcpy_toio(mem->payload, t->tx_buf, t->tx_len); | |
444 | } | |
445 | ||
8cb7cf56 SH |
446 | if (t->rx_buf) { |
447 | if (!(++ch->token)) | |
448 | ++ch->token; | |
96fe77b6 | 449 | t->cmd |= FIELD_PREP(CMD_TOKEN_ID_MASK, ch->token); |
8cb7cf56 SH |
450 | spin_lock_irqsave(&ch->rx_lock, flags); |
451 | list_add_tail(&t->node, &ch->rx_pending); | |
452 | spin_unlock_irqrestore(&ch->rx_lock, flags); | |
453 | } | |
4dfe32d5 NA |
454 | |
455 | if (!scpi_info->is_legacy) | |
5204abd3 | 456 | iowrite32(t->cmd, &mem->command); |
8cb7cf56 SH |
457 | } |
458 | ||
459 | static struct scpi_xfer *get_scpi_xfer(struct scpi_chan *ch) | |
460 | { | |
461 | struct scpi_xfer *t; | |
462 | ||
463 | mutex_lock(&ch->xfers_lock); | |
464 | if (list_empty(&ch->xfers_list)) { | |
465 | mutex_unlock(&ch->xfers_lock); | |
466 | return NULL; | |
467 | } | |
468 | t = list_first_entry(&ch->xfers_list, struct scpi_xfer, node); | |
469 | list_del(&t->node); | |
470 | mutex_unlock(&ch->xfers_lock); | |
471 | return t; | |
472 | } | |
473 | ||
474 | static void put_scpi_xfer(struct scpi_xfer *t, struct scpi_chan *ch) | |
475 | { | |
476 | mutex_lock(&ch->xfers_lock); | |
477 | list_add_tail(&t->node, &ch->xfers_list); | |
478 | mutex_unlock(&ch->xfers_lock); | |
479 | } | |
480 | ||
761d0efe | 481 | static int scpi_send_message(u8 idx, void *tx_buf, unsigned int tx_len, |
8cb7cf56 SH |
482 | void *rx_buf, unsigned int rx_len) |
483 | { | |
484 | int ret; | |
485 | u8 chan; | |
761d0efe | 486 | u8 cmd; |
8cb7cf56 SH |
487 | struct scpi_xfer *msg; |
488 | struct scpi_chan *scpi_chan; | |
489 | ||
761d0efe SH |
490 | if (scpi_info->commands[idx] < 0) |
491 | return -EOPNOTSUPP; | |
492 | ||
493 | cmd = scpi_info->commands[idx]; | |
494 | ||
4dfe32d5 NA |
495 | if (scpi_info->is_legacy) |
496 | chan = test_bit(cmd, scpi_info->cmd_priority) ? 1 : 0; | |
497 | else | |
498 | chan = atomic_inc_return(&scpi_info->next_chan) % | |
499 | scpi_info->num_chans; | |
8cb7cf56 SH |
500 | scpi_chan = scpi_info->channels + chan; |
501 | ||
502 | msg = get_scpi_xfer(scpi_chan); | |
503 | if (!msg) | |
504 | return -ENOMEM; | |
505 | ||
4dfe32d5 NA |
506 | if (scpi_info->is_legacy) { |
507 | msg->cmd = PACK_LEGACY_SCPI_CMD(cmd, tx_len); | |
508 | msg->slot = msg->cmd; | |
509 | } else { | |
510 | msg->slot = BIT(SCPI_SLOT); | |
511 | msg->cmd = PACK_SCPI_CMD(cmd, tx_len); | |
512 | } | |
8cb7cf56 SH |
513 | msg->tx_buf = tx_buf; |
514 | msg->tx_len = tx_len; | |
515 | msg->rx_buf = rx_buf; | |
516 | msg->rx_len = rx_len; | |
c511fa3f | 517 | reinit_completion(&msg->done); |
8cb7cf56 SH |
518 | |
519 | ret = mbox_send_message(scpi_chan->chan, msg); | |
520 | if (ret < 0 || !rx_buf) | |
521 | goto out; | |
522 | ||
523 | if (!wait_for_completion_timeout(&msg->done, MAX_RX_TIMEOUT)) | |
524 | ret = -ETIMEDOUT; | |
525 | else | |
526 | /* first status word */ | |
dd9a1d69 | 527 | ret = msg->status; |
8cb7cf56 SH |
528 | out: |
529 | if (ret < 0 && rx_buf) /* remove entry from the list if timed-out */ | |
530 | scpi_process_cmd(scpi_chan, msg->cmd); | |
531 | ||
532 | put_scpi_xfer(msg, scpi_chan); | |
533 | /* SCPI error codes > 0, translate them to Linux scale*/ | |
534 | return ret > 0 ? scpi_to_linux_errno(ret) : ret; | |
535 | } | |
536 | ||
537 | static u32 scpi_get_version(void) | |
538 | { | |
539 | return scpi_info->protocol_version; | |
540 | } | |
541 | ||
542 | static int | |
543 | scpi_clk_get_range(u16 clk_id, unsigned long *min, unsigned long *max) | |
544 | { | |
545 | int ret; | |
546 | struct clk_get_info clk; | |
547 | __le16 le_clk_id = cpu_to_le16(clk_id); | |
548 | ||
761d0efe | 549 | ret = scpi_send_message(CMD_GET_CLOCK_INFO, &le_clk_id, |
8cb7cf56 SH |
550 | sizeof(le_clk_id), &clk, sizeof(clk)); |
551 | if (!ret) { | |
552 | *min = le32_to_cpu(clk.min_rate); | |
553 | *max = le32_to_cpu(clk.max_rate); | |
554 | } | |
555 | return ret; | |
556 | } | |
557 | ||
558 | static unsigned long scpi_clk_get_val(u16 clk_id) | |
559 | { | |
560 | int ret; | |
c10bd41a | 561 | __le32 rate; |
8cb7cf56 SH |
562 | __le16 le_clk_id = cpu_to_le16(clk_id); |
563 | ||
761d0efe | 564 | ret = scpi_send_message(CMD_GET_CLOCK_VALUE, &le_clk_id, |
c10bd41a | 565 | sizeof(le_clk_id), &rate, sizeof(rate)); |
761d0efe | 566 | |
c10bd41a | 567 | return ret ? ret : le32_to_cpu(rate); |
8cb7cf56 SH |
568 | } |
569 | ||
570 | static int scpi_clk_set_val(u16 clk_id, unsigned long rate) | |
571 | { | |
572 | int stat; | |
573 | struct clk_set_value clk = { | |
574 | .id = cpu_to_le16(clk_id), | |
575 | .rate = cpu_to_le32(rate) | |
576 | }; | |
577 | ||
761d0efe | 578 | return scpi_send_message(CMD_SET_CLOCK_VALUE, &clk, sizeof(clk), |
8cb7cf56 SH |
579 | &stat, sizeof(stat)); |
580 | } | |
581 | ||
4dfe32d5 NA |
582 | static int legacy_scpi_clk_set_val(u16 clk_id, unsigned long rate) |
583 | { | |
584 | int stat; | |
585 | struct legacy_clk_set_value clk = { | |
586 | .id = cpu_to_le16(clk_id), | |
587 | .rate = cpu_to_le32(rate) | |
588 | }; | |
589 | ||
590 | return scpi_send_message(CMD_SET_CLOCK_VALUE, &clk, sizeof(clk), | |
591 | &stat, sizeof(stat)); | |
592 | } | |
593 | ||
8cb7cf56 SH |
594 | static int scpi_dvfs_get_idx(u8 domain) |
595 | { | |
596 | int ret; | |
f9d91de0 | 597 | u8 dvfs_idx; |
8cb7cf56 | 598 | |
761d0efe | 599 | ret = scpi_send_message(CMD_GET_DVFS, &domain, sizeof(domain), |
f9d91de0 | 600 | &dvfs_idx, sizeof(dvfs_idx)); |
761d0efe | 601 | |
f9d91de0 | 602 | return ret ? ret : dvfs_idx; |
8cb7cf56 SH |
603 | } |
604 | ||
605 | static int scpi_dvfs_set_idx(u8 domain, u8 index) | |
606 | { | |
607 | int stat; | |
608 | struct dvfs_set dvfs = {domain, index}; | |
609 | ||
761d0efe | 610 | return scpi_send_message(CMD_SET_DVFS, &dvfs, sizeof(dvfs), |
8cb7cf56 SH |
611 | &stat, sizeof(stat)); |
612 | } | |
613 | ||
614 | static int opp_cmp_func(const void *opp1, const void *opp2) | |
615 | { | |
616 | const struct scpi_opp *t1 = opp1, *t2 = opp2; | |
617 | ||
618 | return t1->freq - t2->freq; | |
619 | } | |
620 | ||
621 | static struct scpi_dvfs_info *scpi_dvfs_get_info(u8 domain) | |
622 | { | |
623 | struct scpi_dvfs_info *info; | |
624 | struct scpi_opp *opp; | |
625 | struct dvfs_info buf; | |
626 | int ret, i; | |
627 | ||
81faa556 OJ |
628 | if (domain >= MAX_DVFS_DOMAINS) |
629 | return ERR_PTR(-EINVAL); | |
630 | ||
631 | if (scpi_info->dvfs[domain]) /* data already populated */ | |
632 | return scpi_info->dvfs[domain]; | |
633 | ||
761d0efe | 634 | ret = scpi_send_message(CMD_GET_DVFS_INFO, &domain, sizeof(domain), |
8cb7cf56 | 635 | &buf, sizeof(buf)); |
8cb7cf56 | 636 | if (ret) |
81faa556 | 637 | return ERR_PTR(ret); |
8cb7cf56 | 638 | |
81faa556 | 639 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
8cb7cf56 | 640 | if (!info) |
81faa556 | 641 | return ERR_PTR(-ENOMEM); |
8cb7cf56 | 642 | |
a963d7c5 HK |
643 | info->count = buf.opp_count; |
644 | info->latency = le16_to_cpu(buf.latency) * 1000; /* uS to nS */ | |
8cb7cf56 | 645 | |
81faa556 OJ |
646 | info->opps = kcalloc(info->count, sizeof(*opp), GFP_KERNEL); |
647 | if (!info->opps) { | |
648 | kfree(info); | |
649 | return ERR_PTR(-ENOMEM); | |
650 | } | |
8cb7cf56 SH |
651 | |
652 | for (i = 0, opp = info->opps; i < info->count; i++, opp++) { | |
653 | opp->freq = le32_to_cpu(buf.opps[i].freq); | |
654 | opp->m_volt = le32_to_cpu(buf.opps[i].m_volt); | |
655 | } | |
656 | ||
657 | sort(info->opps, info->count, sizeof(*opp), opp_cmp_func, NULL); | |
658 | ||
659 | scpi_info->dvfs[domain] = info; | |
81faa556 | 660 | return info; |
8cb7cf56 SH |
661 | } |
662 | ||
45ca7df7 SH |
663 | static int scpi_dev_domain_id(struct device *dev) |
664 | { | |
665 | struct of_phandle_args clkspec; | |
666 | ||
667 | if (of_parse_phandle_with_args(dev->of_node, "clocks", "#clock-cells", | |
668 | 0, &clkspec)) | |
669 | return -EINVAL; | |
670 | ||
671 | return clkspec.args[0]; | |
672 | } | |
673 | ||
674 | static struct scpi_dvfs_info *scpi_dvfs_info(struct device *dev) | |
675 | { | |
676 | int domain = scpi_dev_domain_id(dev); | |
677 | ||
678 | if (domain < 0) | |
679 | return ERR_PTR(domain); | |
680 | ||
681 | return scpi_dvfs_get_info(domain); | |
682 | } | |
683 | ||
684 | static int scpi_dvfs_get_transition_latency(struct device *dev) | |
685 | { | |
686 | struct scpi_dvfs_info *info = scpi_dvfs_info(dev); | |
687 | ||
688 | if (IS_ERR(info)) | |
689 | return PTR_ERR(info); | |
690 | ||
45ca7df7 SH |
691 | return info->latency; |
692 | } | |
693 | ||
694 | static int scpi_dvfs_add_opps_to_device(struct device *dev) | |
695 | { | |
696 | int idx, ret; | |
697 | struct scpi_opp *opp; | |
698 | struct scpi_dvfs_info *info = scpi_dvfs_info(dev); | |
699 | ||
700 | if (IS_ERR(info)) | |
701 | return PTR_ERR(info); | |
702 | ||
703 | if (!info->opps) | |
704 | return -EIO; | |
705 | ||
706 | for (opp = info->opps, idx = 0; idx < info->count; idx++, opp++) { | |
707 | ret = dev_pm_opp_add(dev, opp->freq, opp->m_volt * 1000); | |
708 | if (ret) { | |
709 | dev_warn(dev, "failed to add opp %uHz %umV\n", | |
710 | opp->freq, opp->m_volt); | |
711 | while (idx-- > 0) | |
712 | dev_pm_opp_remove(dev, (--opp)->freq); | |
713 | return ret; | |
714 | } | |
715 | } | |
716 | return 0; | |
717 | } | |
718 | ||
38a1bdc9 PA |
719 | static int scpi_sensor_get_capability(u16 *sensors) |
720 | { | |
17431b78 | 721 | __le16 cap; |
38a1bdc9 PA |
722 | int ret; |
723 | ||
17431b78 HK |
724 | ret = scpi_send_message(CMD_SENSOR_CAPABILITIES, NULL, 0, &cap, |
725 | sizeof(cap)); | |
38a1bdc9 | 726 | if (!ret) |
17431b78 | 727 | *sensors = le16_to_cpu(cap); |
38a1bdc9 PA |
728 | |
729 | return ret; | |
730 | } | |
731 | ||
732 | static int scpi_sensor_get_info(u16 sensor_id, struct scpi_sensor_info *info) | |
733 | { | |
734 | __le16 id = cpu_to_le16(sensor_id); | |
735 | struct _scpi_sensor_info _info; | |
736 | int ret; | |
737 | ||
761d0efe | 738 | ret = scpi_send_message(CMD_SENSOR_INFO, &id, sizeof(id), |
38a1bdc9 PA |
739 | &_info, sizeof(_info)); |
740 | if (!ret) { | |
741 | memcpy(info, &_info, sizeof(*info)); | |
742 | info->sensor_id = le16_to_cpu(_info.sensor_id); | |
743 | } | |
744 | ||
745 | return ret; | |
746 | } | |
747 | ||
3678b98f | 748 | static int scpi_sensor_get_value(u16 sensor, u64 *val) |
38a1bdc9 | 749 | { |
dd9a1d69 | 750 | __le16 id = cpu_to_le16(sensor); |
c10bd41a | 751 | __le64 value; |
38a1bdc9 PA |
752 | int ret; |
753 | ||
761d0efe | 754 | ret = scpi_send_message(CMD_SENSOR_VALUE, &id, sizeof(id), |
c10bd41a | 755 | &value, sizeof(value)); |
a766347b MB |
756 | if (ret) |
757 | return ret; | |
758 | ||
759 | if (scpi_info->is_legacy) | |
83a6060c | 760 | /* only 32-bits supported, upper 32 bits can be junk */ |
c10bd41a | 761 | *val = le32_to_cpup((__le32 *)&value); |
a766347b | 762 | else |
c10bd41a | 763 | *val = le64_to_cpu(value); |
38a1bdc9 | 764 | |
a766347b | 765 | return 0; |
38a1bdc9 PA |
766 | } |
767 | ||
37a441dc SH |
768 | static int scpi_device_get_power_state(u16 dev_id) |
769 | { | |
770 | int ret; | |
771 | u8 pstate; | |
772 | __le16 id = cpu_to_le16(dev_id); | |
773 | ||
761d0efe | 774 | ret = scpi_send_message(CMD_GET_DEVICE_PWR_STATE, &id, |
37a441dc SH |
775 | sizeof(id), &pstate, sizeof(pstate)); |
776 | return ret ? ret : pstate; | |
777 | } | |
778 | ||
779 | static int scpi_device_set_power_state(u16 dev_id, u8 pstate) | |
780 | { | |
781 | int stat; | |
782 | struct dev_pstate_set dev_set = { | |
783 | .dev_id = cpu_to_le16(dev_id), | |
784 | .pstate = pstate, | |
785 | }; | |
786 | ||
761d0efe | 787 | return scpi_send_message(CMD_SET_DEVICE_PWR_STATE, &dev_set, |
37a441dc SH |
788 | sizeof(dev_set), &stat, sizeof(stat)); |
789 | } | |
790 | ||
8cb7cf56 SH |
791 | static struct scpi_ops scpi_ops = { |
792 | .get_version = scpi_get_version, | |
793 | .clk_get_range = scpi_clk_get_range, | |
794 | .clk_get_val = scpi_clk_get_val, | |
795 | .clk_set_val = scpi_clk_set_val, | |
796 | .dvfs_get_idx = scpi_dvfs_get_idx, | |
797 | .dvfs_set_idx = scpi_dvfs_set_idx, | |
798 | .dvfs_get_info = scpi_dvfs_get_info, | |
45ca7df7 SH |
799 | .device_domain_id = scpi_dev_domain_id, |
800 | .get_transition_latency = scpi_dvfs_get_transition_latency, | |
801 | .add_opps_to_device = scpi_dvfs_add_opps_to_device, | |
38a1bdc9 PA |
802 | .sensor_get_capability = scpi_sensor_get_capability, |
803 | .sensor_get_info = scpi_sensor_get_info, | |
804 | .sensor_get_value = scpi_sensor_get_value, | |
37a441dc SH |
805 | .device_get_power_state = scpi_device_get_power_state, |
806 | .device_set_power_state = scpi_device_set_power_state, | |
8cb7cf56 SH |
807 | }; |
808 | ||
809 | struct scpi_ops *get_scpi_ops(void) | |
810 | { | |
811 | return scpi_info ? scpi_info->scpi_ops : NULL; | |
812 | } | |
813 | EXPORT_SYMBOL_GPL(get_scpi_ops); | |
814 | ||
815 | static int scpi_init_versions(struct scpi_drvinfo *info) | |
816 | { | |
817 | int ret; | |
818 | struct scp_capabilities caps; | |
819 | ||
761d0efe | 820 | ret = scpi_send_message(CMD_SCPI_CAPABILITIES, NULL, 0, |
8cb7cf56 SH |
821 | &caps, sizeof(caps)); |
822 | if (!ret) { | |
823 | info->protocol_version = le32_to_cpu(caps.protocol_version); | |
824 | info->firmware_version = le32_to_cpu(caps.platform_version); | |
825 | } | |
abd3e805 NA |
826 | /* Ignore error if not implemented */ |
827 | if (scpi_info->is_legacy && ret == -EOPNOTSUPP) | |
828 | return 0; | |
829 | ||
8cb7cf56 SH |
830 | return ret; |
831 | } | |
832 | ||
833 | static ssize_t protocol_version_show(struct device *dev, | |
834 | struct device_attribute *attr, char *buf) | |
835 | { | |
81faa556 OJ |
836 | struct scpi_drvinfo *scpi_info = dev_get_drvdata(dev); |
837 | ||
7cd49a26 HK |
838 | return sprintf(buf, "%lu.%lu\n", |
839 | FIELD_GET(PROTO_REV_MAJOR_MASK, scpi_info->protocol_version), | |
840 | FIELD_GET(PROTO_REV_MINOR_MASK, scpi_info->protocol_version)); | |
8cb7cf56 SH |
841 | } |
842 | static DEVICE_ATTR_RO(protocol_version); | |
843 | ||
844 | static ssize_t firmware_version_show(struct device *dev, | |
845 | struct device_attribute *attr, char *buf) | |
846 | { | |
81faa556 OJ |
847 | struct scpi_drvinfo *scpi_info = dev_get_drvdata(dev); |
848 | ||
7cd49a26 HK |
849 | return sprintf(buf, "%lu.%lu.%lu\n", |
850 | FIELD_GET(FW_REV_MAJOR_MASK, scpi_info->firmware_version), | |
851 | FIELD_GET(FW_REV_MINOR_MASK, scpi_info->firmware_version), | |
852 | FIELD_GET(FW_REV_PATCH_MASK, scpi_info->firmware_version)); | |
8cb7cf56 SH |
853 | } |
854 | static DEVICE_ATTR_RO(firmware_version); | |
855 | ||
856 | static struct attribute *versions_attrs[] = { | |
857 | &dev_attr_firmware_version.attr, | |
858 | &dev_attr_protocol_version.attr, | |
859 | NULL, | |
860 | }; | |
861 | ATTRIBUTE_GROUPS(versions); | |
862 | ||
c14f1db4 | 863 | static void scpi_free_channels(void *data) |
8cb7cf56 | 864 | { |
c14f1db4 | 865 | struct scpi_drvinfo *info = data; |
8cb7cf56 SH |
866 | int i; |
867 | ||
c14f1db4 HK |
868 | for (i = 0; i < info->num_chans; i++) |
869 | mbox_free_channel(info->channels[i].chan); | |
81faa556 OJ |
870 | } |
871 | ||
872 | static int scpi_remove(struct platform_device *pdev) | |
873 | { | |
874 | int i; | |
81faa556 OJ |
875 | struct scpi_drvinfo *info = platform_get_drvdata(pdev); |
876 | ||
877 | scpi_info = NULL; /* stop exporting SCPI ops through get_scpi_ops */ | |
878 | ||
81faa556 OJ |
879 | for (i = 0; i < MAX_DVFS_DOMAINS && info->dvfs[i]; i++) { |
880 | kfree(info->dvfs[i]->opps); | |
881 | kfree(info->dvfs[i]); | |
882 | } | |
81faa556 OJ |
883 | |
884 | return 0; | |
8cb7cf56 SH |
885 | } |
886 | ||
8cb7cf56 SH |
887 | #define MAX_SCPI_XFERS 10 |
888 | static int scpi_alloc_xfer_list(struct device *dev, struct scpi_chan *ch) | |
889 | { | |
890 | int i; | |
891 | struct scpi_xfer *xfers; | |
892 | ||
893 | xfers = devm_kzalloc(dev, MAX_SCPI_XFERS * sizeof(*xfers), GFP_KERNEL); | |
894 | if (!xfers) | |
895 | return -ENOMEM; | |
896 | ||
897 | ch->xfers = xfers; | |
c511fa3f AK |
898 | for (i = 0; i < MAX_SCPI_XFERS; i++, xfers++) { |
899 | init_completion(&xfers->done); | |
8cb7cf56 | 900 | list_add_tail(&xfers->node, &ch->xfers_list); |
c511fa3f AK |
901 | } |
902 | ||
8cb7cf56 SH |
903 | return 0; |
904 | } | |
905 | ||
8358c6b5 SH |
906 | static const struct of_device_id legacy_scpi_of_match[] = { |
907 | {.compatible = "arm,scpi-pre-1.0"}, | |
908 | {}, | |
909 | }; | |
910 | ||
8cb7cf56 SH |
911 | static int scpi_probe(struct platform_device *pdev) |
912 | { | |
913 | int count, idx, ret; | |
914 | struct resource res; | |
8cb7cf56 SH |
915 | struct device *dev = &pdev->dev; |
916 | struct device_node *np = dev->of_node; | |
917 | ||
918 | scpi_info = devm_kzalloc(dev, sizeof(*scpi_info), GFP_KERNEL); | |
919 | if (!scpi_info) | |
920 | return -ENOMEM; | |
921 | ||
8358c6b5 SH |
922 | if (of_match_device(legacy_scpi_of_match, &pdev->dev)) |
923 | scpi_info->is_legacy = true; | |
924 | ||
8cb7cf56 SH |
925 | count = of_count_phandle_with_args(np, "mboxes", "#mbox-cells"); |
926 | if (count < 0) { | |
9deee319 | 927 | dev_err(dev, "no mboxes property in '%pOF'\n", np); |
8cb7cf56 SH |
928 | return -ENODEV; |
929 | } | |
930 | ||
c14f1db4 HK |
931 | scpi_info->channels = devm_kcalloc(dev, count, sizeof(struct scpi_chan), |
932 | GFP_KERNEL); | |
933 | if (!scpi_info->channels) | |
8cb7cf56 SH |
934 | return -ENOMEM; |
935 | ||
c14f1db4 HK |
936 | ret = devm_add_action(dev, scpi_free_channels, scpi_info); |
937 | if (ret) | |
938 | return ret; | |
939 | ||
940 | for (; scpi_info->num_chans < count; scpi_info->num_chans++) { | |
8cb7cf56 | 941 | resource_size_t size; |
c14f1db4 HK |
942 | int idx = scpi_info->num_chans; |
943 | struct scpi_chan *pchan = scpi_info->channels + idx; | |
8cb7cf56 SH |
944 | struct mbox_client *cl = &pchan->cl; |
945 | struct device_node *shmem = of_parse_phandle(np, "shmem", idx); | |
946 | ||
b079bd55 PC |
947 | ret = of_address_to_resource(shmem, 0, &res); |
948 | of_node_put(shmem); | |
949 | if (ret) { | |
8cb7cf56 | 950 | dev_err(dev, "failed to get SCPI payload mem resource\n"); |
c14f1db4 | 951 | return ret; |
8cb7cf56 SH |
952 | } |
953 | ||
954 | size = resource_size(&res); | |
955 | pchan->rx_payload = devm_ioremap(dev, res.start, size); | |
956 | if (!pchan->rx_payload) { | |
957 | dev_err(dev, "failed to ioremap SCPI payload\n"); | |
c14f1db4 | 958 | return -EADDRNOTAVAIL; |
8cb7cf56 SH |
959 | } |
960 | pchan->tx_payload = pchan->rx_payload + (size >> 1); | |
961 | ||
962 | cl->dev = dev; | |
963 | cl->rx_callback = scpi_handle_remote_msg; | |
964 | cl->tx_prepare = scpi_tx_prepare; | |
965 | cl->tx_block = true; | |
3bdd8843 | 966 | cl->tx_tout = 20; |
8cb7cf56 SH |
967 | cl->knows_txdone = false; /* controller can't ack */ |
968 | ||
969 | INIT_LIST_HEAD(&pchan->rx_pending); | |
970 | INIT_LIST_HEAD(&pchan->xfers_list); | |
971 | spin_lock_init(&pchan->rx_lock); | |
972 | mutex_init(&pchan->xfers_lock); | |
973 | ||
974 | ret = scpi_alloc_xfer_list(dev, pchan); | |
975 | if (!ret) { | |
976 | pchan->chan = mbox_request_channel(cl, idx); | |
977 | if (!IS_ERR(pchan->chan)) | |
978 | continue; | |
979 | ret = PTR_ERR(pchan->chan); | |
980 | if (ret != -EPROBE_DEFER) | |
981 | dev_err(dev, "failed to get channel%d err %d\n", | |
982 | idx, ret); | |
983 | } | |
8cb7cf56 SH |
984 | return ret; |
985 | } | |
986 | ||
761d0efe | 987 | scpi_info->commands = scpi_std_commands; |
81faa556 OJ |
988 | |
989 | platform_set_drvdata(pdev, scpi_info); | |
761d0efe | 990 | |
4dfe32d5 NA |
991 | if (scpi_info->is_legacy) { |
992 | /* Replace with legacy variants */ | |
993 | scpi_ops.clk_set_val = legacy_scpi_clk_set_val; | |
994 | scpi_info->commands = scpi_legacy_commands; | |
995 | ||
996 | /* Fill priority bitmap */ | |
997 | for (idx = 0; idx < ARRAY_SIZE(legacy_hpriority_cmds); idx++) | |
998 | set_bit(legacy_hpriority_cmds[idx], | |
999 | scpi_info->cmd_priority); | |
1000 | } | |
1001 | ||
8cb7cf56 SH |
1002 | ret = scpi_init_versions(scpi_info); |
1003 | if (ret) { | |
1004 | dev_err(dev, "incorrect or no SCP firmware found\n"); | |
8cb7cf56 SH |
1005 | return ret; |
1006 | } | |
1007 | ||
62c60efb HK |
1008 | if (scpi_info->is_legacy && !scpi_info->protocol_version && |
1009 | !scpi_info->firmware_version) | |
1010 | dev_info(dev, "SCP Protocol legacy pre-1.0 firmware\n"); | |
1011 | else | |
1012 | dev_info(dev, "SCP Protocol %lu.%lu Firmware %lu.%lu.%lu version\n", | |
1013 | FIELD_GET(PROTO_REV_MAJOR_MASK, | |
1014 | scpi_info->protocol_version), | |
1015 | FIELD_GET(PROTO_REV_MINOR_MASK, | |
1016 | scpi_info->protocol_version), | |
1017 | FIELD_GET(FW_REV_MAJOR_MASK, | |
1018 | scpi_info->firmware_version), | |
1019 | FIELD_GET(FW_REV_MINOR_MASK, | |
1020 | scpi_info->firmware_version), | |
1021 | FIELD_GET(FW_REV_PATCH_MASK, | |
1022 | scpi_info->firmware_version)); | |
81faa556 | 1023 | scpi_info->scpi_ops = &scpi_ops; |
8cb7cf56 | 1024 | |
5abc7935 | 1025 | ret = devm_device_add_groups(dev, versions_groups); |
8cb7cf56 SH |
1026 | if (ret) |
1027 | dev_err(dev, "unable to create sysfs version group\n"); | |
1028 | ||
5abc7935 | 1029 | return devm_of_platform_populate(dev); |
8cb7cf56 SH |
1030 | } |
1031 | ||
1032 | static const struct of_device_id scpi_of_match[] = { | |
1033 | {.compatible = "arm,scpi"}, | |
8358c6b5 | 1034 | {.compatible = "arm,scpi-pre-1.0"}, |
8cb7cf56 SH |
1035 | {}, |
1036 | }; | |
1037 | ||
1038 | MODULE_DEVICE_TABLE(of, scpi_of_match); | |
1039 | ||
1040 | static struct platform_driver scpi_driver = { | |
1041 | .driver = { | |
1042 | .name = "scpi_protocol", | |
1043 | .of_match_table = scpi_of_match, | |
1044 | }, | |
1045 | .probe = scpi_probe, | |
81faa556 | 1046 | .remove = scpi_remove, |
8cb7cf56 SH |
1047 | }; |
1048 | module_platform_driver(scpi_driver); | |
1049 | ||
1050 | MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>"); | |
1051 | MODULE_DESCRIPTION("ARM SCPI mailbox protocol driver"); | |
1052 | MODULE_LICENSE("GPL v2"); |