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x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / drivers / firmware / arm_scpi.c
blob9ad0b1934be9a31173ede1ed6c1c3705cc0c1e05
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>
31 #include <linux/device.h>
32 #include <linux/err.h>
33 #include <linux/export.h>
34 #include <linux/io.h>
35 #include <linux/kernel.h>
36 #include <linux/list.h>
37 #include <linux/mailbox_client.h>
38 #include <linux/module.h>
39 #include <linux/of_address.h>
40 #include <linux/of_platform.h>
41 #include <linux/printk.h>
42 #include <linux/scpi_protocol.h>
43 #include <linux/slab.h>
44 #include <linux/sort.h>
45 #include <linux/spinlock.h>
46
47 #define CMD_ID_SHIFT 0
48 #define CMD_ID_MASK 0x7f
49 #define CMD_TOKEN_ID_SHIFT 8
50 #define CMD_TOKEN_ID_MASK 0xff
51 #define CMD_DATA_SIZE_SHIFT 16
52 #define CMD_DATA_SIZE_MASK 0x1ff
53 #define CMD_LEGACY_DATA_SIZE_SHIFT 20
54 #define CMD_LEGACY_DATA_SIZE_MASK 0x1ff
55 #define PACK_SCPI_CMD(cmd_id, tx_sz) \
56 ((((cmd_id) & CMD_ID_MASK) << CMD_ID_SHIFT) | \
57 (((tx_sz) & CMD_DATA_SIZE_MASK) << CMD_DATA_SIZE_SHIFT))
58 #define ADD_SCPI_TOKEN(cmd, token) \
59 ((cmd) |= (((token) & CMD_TOKEN_ID_MASK) << CMD_TOKEN_ID_SHIFT))
60 #define PACK_LEGACY_SCPI_CMD(cmd_id, tx_sz) \
61 ((((cmd_id) & CMD_ID_MASK) << CMD_ID_SHIFT) | \
62 (((tx_sz) & CMD_LEGACY_DATA_SIZE_MASK) << CMD_LEGACY_DATA_SIZE_SHIFT))
63
64 #define CMD_SIZE(cmd) (((cmd) >> CMD_DATA_SIZE_SHIFT) & CMD_DATA_SIZE_MASK)
65 #define CMD_LEGACY_SIZE(cmd) (((cmd) >> CMD_LEGACY_DATA_SIZE_SHIFT) & \
66 CMD_LEGACY_DATA_SIZE_MASK)
67 #define CMD_UNIQ_MASK (CMD_TOKEN_ID_MASK << CMD_TOKEN_ID_SHIFT | CMD_ID_MASK)
68 #define CMD_XTRACT_UNIQ(cmd) ((cmd) & CMD_UNIQ_MASK)
69
70 #define SCPI_SLOT 0
71
72 #define MAX_DVFS_DOMAINS 8
73 #define MAX_DVFS_OPPS 16
74 #define DVFS_LATENCY(hdr) (le32_to_cpu(hdr) >> 16)
75 #define DVFS_OPP_COUNT(hdr) ((le32_to_cpu(hdr) >> 8) & 0xff)
76
77 #define PROTOCOL_REV_MINOR_BITS 16
78 #define PROTOCOL_REV_MINOR_MASK ((1U << PROTOCOL_REV_MINOR_BITS) - 1)
79 #define PROTOCOL_REV_MAJOR(x) ((x) >> PROTOCOL_REV_MINOR_BITS)
80 #define PROTOCOL_REV_MINOR(x) ((x) & PROTOCOL_REV_MINOR_MASK)
81
82 #define FW_REV_MAJOR_BITS 24
83 #define FW_REV_MINOR_BITS 16
84 #define FW_REV_PATCH_MASK ((1U << FW_REV_MINOR_BITS) - 1)
85 #define FW_REV_MINOR_MASK ((1U << FW_REV_MAJOR_BITS) - 1)
86 #define FW_REV_MAJOR(x) ((x) >> FW_REV_MAJOR_BITS)
87 #define FW_REV_MINOR(x) (((x) & FW_REV_MINOR_MASK) >> FW_REV_MINOR_BITS)
88 #define FW_REV_PATCH(x) ((x) & FW_REV_PATCH_MASK)
89
90 #define MAX_RX_TIMEOUT (msecs_to_jiffies(30))
91
92 enum scpi_error_codes {
93 SCPI_SUCCESS = 0, /* Success */
94 SCPI_ERR_PARAM = 1, /* Invalid parameter(s) */
95 SCPI_ERR_ALIGN = 2, /* Invalid alignment */
96 SCPI_ERR_SIZE = 3, /* Invalid size */
97 SCPI_ERR_HANDLER = 4, /* Invalid handler/callback */
98 SCPI_ERR_ACCESS = 5, /* Invalid access/permission denied */
99 SCPI_ERR_RANGE = 6, /* Value out of range */
100 SCPI_ERR_TIMEOUT = 7, /* Timeout has occurred */
101 SCPI_ERR_NOMEM = 8, /* Invalid memory area or pointer */
102 SCPI_ERR_PWRSTATE = 9, /* Invalid power state */
103 SCPI_ERR_SUPPORT = 10, /* Not supported or disabled */
104 SCPI_ERR_DEVICE = 11, /* Device error */
105 SCPI_ERR_BUSY = 12, /* Device busy */
106 SCPI_ERR_MAX
107 };
108
109 /* SCPI Standard commands */
110 enum scpi_std_cmd {
111 SCPI_CMD_INVALID = 0x00,
112 SCPI_CMD_SCPI_READY = 0x01,
113 SCPI_CMD_SCPI_CAPABILITIES = 0x02,
114 SCPI_CMD_SET_CSS_PWR_STATE = 0x03,
115 SCPI_CMD_GET_CSS_PWR_STATE = 0x04,
116 SCPI_CMD_SET_SYS_PWR_STATE = 0x05,
117 SCPI_CMD_SET_CPU_TIMER = 0x06,
118 SCPI_CMD_CANCEL_CPU_TIMER = 0x07,
119 SCPI_CMD_DVFS_CAPABILITIES = 0x08,
120 SCPI_CMD_GET_DVFS_INFO = 0x09,
121 SCPI_CMD_SET_DVFS = 0x0a,
122 SCPI_CMD_GET_DVFS = 0x0b,
123 SCPI_CMD_GET_DVFS_STAT = 0x0c,
124 SCPI_CMD_CLOCK_CAPABILITIES = 0x0d,
125 SCPI_CMD_GET_CLOCK_INFO = 0x0e,
126 SCPI_CMD_SET_CLOCK_VALUE = 0x0f,
127 SCPI_CMD_GET_CLOCK_VALUE = 0x10,
128 SCPI_CMD_PSU_CAPABILITIES = 0x11,
129 SCPI_CMD_GET_PSU_INFO = 0x12,
130 SCPI_CMD_SET_PSU = 0x13,
131 SCPI_CMD_GET_PSU = 0x14,
132 SCPI_CMD_SENSOR_CAPABILITIES = 0x15,
133 SCPI_CMD_SENSOR_INFO = 0x16,
134 SCPI_CMD_SENSOR_VALUE = 0x17,
135 SCPI_CMD_SENSOR_CFG_PERIODIC = 0x18,
136 SCPI_CMD_SENSOR_CFG_BOUNDS = 0x19,
137 SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1a,
138 SCPI_CMD_SET_DEVICE_PWR_STATE = 0x1b,
139 SCPI_CMD_GET_DEVICE_PWR_STATE = 0x1c,
140 SCPI_CMD_COUNT
141 };
142
143 /* SCPI Legacy Commands */
144 enum legacy_scpi_std_cmd {
145 LEGACY_SCPI_CMD_INVALID = 0x00,
146 LEGACY_SCPI_CMD_SCPI_READY = 0x01,
147 LEGACY_SCPI_CMD_SCPI_CAPABILITIES = 0x02,
148 LEGACY_SCPI_CMD_EVENT = 0x03,
149 LEGACY_SCPI_CMD_SET_CSS_PWR_STATE = 0x04,
150 LEGACY_SCPI_CMD_GET_CSS_PWR_STATE = 0x05,
151 LEGACY_SCPI_CMD_CFG_PWR_STATE_STAT = 0x06,
152 LEGACY_SCPI_CMD_GET_PWR_STATE_STAT = 0x07,
153 LEGACY_SCPI_CMD_SYS_PWR_STATE = 0x08,
154 LEGACY_SCPI_CMD_L2_READY = 0x09,
155 LEGACY_SCPI_CMD_SET_AP_TIMER = 0x0a,
156 LEGACY_SCPI_CMD_CANCEL_AP_TIME = 0x0b,
157 LEGACY_SCPI_CMD_DVFS_CAPABILITIES = 0x0c,
158 LEGACY_SCPI_CMD_GET_DVFS_INFO = 0x0d,
159 LEGACY_SCPI_CMD_SET_DVFS = 0x0e,
160 LEGACY_SCPI_CMD_GET_DVFS = 0x0f,
161 LEGACY_SCPI_CMD_GET_DVFS_STAT = 0x10,
162 LEGACY_SCPI_CMD_SET_RTC = 0x11,
163 LEGACY_SCPI_CMD_GET_RTC = 0x12,
164 LEGACY_SCPI_CMD_CLOCK_CAPABILITIES = 0x13,
165 LEGACY_SCPI_CMD_SET_CLOCK_INDEX = 0x14,
166 LEGACY_SCPI_CMD_SET_CLOCK_VALUE = 0x15,
167 LEGACY_SCPI_CMD_GET_CLOCK_VALUE = 0x16,
168 LEGACY_SCPI_CMD_PSU_CAPABILITIES = 0x17,
169 LEGACY_SCPI_CMD_SET_PSU = 0x18,
170 LEGACY_SCPI_CMD_GET_PSU = 0x19,
171 LEGACY_SCPI_CMD_SENSOR_CAPABILITIES = 0x1a,
172 LEGACY_SCPI_CMD_SENSOR_INFO = 0x1b,
173 LEGACY_SCPI_CMD_SENSOR_VALUE = 0x1c,
174 LEGACY_SCPI_CMD_SENSOR_CFG_PERIODIC = 0x1d,
175 LEGACY_SCPI_CMD_SENSOR_CFG_BOUNDS = 0x1e,
176 LEGACY_SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1f,
177 LEGACY_SCPI_CMD_COUNT
178 };
179
180 /* List all commands that are required to go through the high priority link */
181 static int legacy_hpriority_cmds[] = {
182 LEGACY_SCPI_CMD_GET_CSS_PWR_STATE,
183 LEGACY_SCPI_CMD_CFG_PWR_STATE_STAT,
184 LEGACY_SCPI_CMD_GET_PWR_STATE_STAT,
185 LEGACY_SCPI_CMD_SET_DVFS,
186 LEGACY_SCPI_CMD_GET_DVFS,
187 LEGACY_SCPI_CMD_SET_RTC,
188 LEGACY_SCPI_CMD_GET_RTC,
189 LEGACY_SCPI_CMD_SET_CLOCK_INDEX,
190 LEGACY_SCPI_CMD_SET_CLOCK_VALUE,
191 LEGACY_SCPI_CMD_GET_CLOCK_VALUE,
192 LEGACY_SCPI_CMD_SET_PSU,
193 LEGACY_SCPI_CMD_GET_PSU,
194 LEGACY_SCPI_CMD_SENSOR_CFG_PERIODIC,
195 LEGACY_SCPI_CMD_SENSOR_CFG_BOUNDS,
196 };
197
198 /* List all commands used by this driver, used as indexes */
199 enum scpi_drv_cmds {
200 CMD_SCPI_CAPABILITIES = 0,
201 CMD_GET_CLOCK_INFO,
202 CMD_GET_CLOCK_VALUE,
203 CMD_SET_CLOCK_VALUE,
204 CMD_GET_DVFS,
205 CMD_SET_DVFS,
206 CMD_GET_DVFS_INFO,
207 CMD_SENSOR_CAPABILITIES,
208 CMD_SENSOR_INFO,
209 CMD_SENSOR_VALUE,
210 CMD_SET_DEVICE_PWR_STATE,
211 CMD_GET_DEVICE_PWR_STATE,
212 CMD_MAX_COUNT,
213 };
214
215 static int scpi_std_commands[CMD_MAX_COUNT] = {
216 SCPI_CMD_SCPI_CAPABILITIES,
217 SCPI_CMD_GET_CLOCK_INFO,
218 SCPI_CMD_GET_CLOCK_VALUE,
219 SCPI_CMD_SET_CLOCK_VALUE,
220 SCPI_CMD_GET_DVFS,
221 SCPI_CMD_SET_DVFS,
222 SCPI_CMD_GET_DVFS_INFO,
223 SCPI_CMD_SENSOR_CAPABILITIES,
224 SCPI_CMD_SENSOR_INFO,
225 SCPI_CMD_SENSOR_VALUE,
226 SCPI_CMD_SET_DEVICE_PWR_STATE,
227 SCPI_CMD_GET_DEVICE_PWR_STATE,
228 };
229
230 static int scpi_legacy_commands[CMD_MAX_COUNT] = {
231 LEGACY_SCPI_CMD_SCPI_CAPABILITIES,
232 -1, /* GET_CLOCK_INFO */
233 LEGACY_SCPI_CMD_GET_CLOCK_VALUE,
234 LEGACY_SCPI_CMD_SET_CLOCK_VALUE,
235 LEGACY_SCPI_CMD_GET_DVFS,
236 LEGACY_SCPI_CMD_SET_DVFS,
237 LEGACY_SCPI_CMD_GET_DVFS_INFO,
238 LEGACY_SCPI_CMD_SENSOR_CAPABILITIES,
239 LEGACY_SCPI_CMD_SENSOR_INFO,
240 LEGACY_SCPI_CMD_SENSOR_VALUE,
241 -1, /* SET_DEVICE_PWR_STATE */
242 -1, /* GET_DEVICE_PWR_STATE */
243 };
244
245 struct scpi_xfer {
246 u32 slot; /* has to be first element */
247 u32 cmd;
248 u32 status;
249 const void *tx_buf;
250 void *rx_buf;
251 unsigned int tx_len;
252 unsigned int rx_len;
253 struct list_head node;
254 struct completion done;
255 };
256
257 struct scpi_chan {
258 struct mbox_client cl;
259 struct mbox_chan *chan;
260 void __iomem *tx_payload;
261 void __iomem *rx_payload;
262 struct list_head rx_pending;
263 struct list_head xfers_list;
264 struct scpi_xfer *xfers;
265 spinlock_t rx_lock; /* locking for the rx pending list */
266 struct mutex xfers_lock;
267 u8 token;
268 };
269
270 struct scpi_drvinfo {
271 u32 protocol_version;
272 u32 firmware_version;
273 bool is_legacy;
274 int num_chans;
275 int *commands;
276 DECLARE_BITMAP(cmd_priority, LEGACY_SCPI_CMD_COUNT);
277 atomic_t next_chan;
278 struct scpi_ops *scpi_ops;
279 struct scpi_chan *channels;
280 struct scpi_dvfs_info *dvfs[MAX_DVFS_DOMAINS];
281 };
282
283 /*
284 * The SCP firmware only executes in little-endian mode, so any buffers
285 * shared through SCPI should have their contents converted to little-endian
286 */
287 struct scpi_shared_mem {
288 __le32 command;
289 __le32 status;
290 u8 payload[0];
291 } __packed;
292
293 struct legacy_scpi_shared_mem {
294 __le32 status;
295 u8 payload[0];
296 } __packed;
297
298 struct scp_capabilities {
299 __le32 protocol_version;
300 __le32 event_version;
301 __le32 platform_version;
302 __le32 commands[4];
303 } __packed;
304
305 struct clk_get_info {
306 __le16 id;
307 __le16 flags;
308 __le32 min_rate;
309 __le32 max_rate;
310 u8 name[20];
311 } __packed;
312
313 struct clk_get_value {
314 __le32 rate;
315 } __packed;
316
317 struct clk_set_value {
318 __le16 id;
319 __le16 reserved;
320 __le32 rate;
321 } __packed;
322
323 struct legacy_clk_set_value {
324 __le32 rate;
325 __le16 id;
326 __le16 reserved;
327 } __packed;
328
329 struct dvfs_info {
330 __le32 header;
331 struct {
332 __le32 freq;
333 __le32 m_volt;
334 } opps[MAX_DVFS_OPPS];
335 } __packed;
336
337 struct dvfs_set {
338 u8 domain;
339 u8 index;
340 } __packed;
341
342 struct sensor_capabilities {
343 __le16 sensors;
344 } __packed;
345
346 struct _scpi_sensor_info {
347 __le16 sensor_id;
348 u8 class;
349 u8 trigger_type;
350 char name[20];
351 };
352
353 struct sensor_value {
354 __le32 lo_val;
355 __le32 hi_val;
356 } __packed;
357
358 struct dev_pstate_set {
359 u16 dev_id;
360 u8 pstate;
361 } __packed;
362
363 static struct scpi_drvinfo *scpi_info;
364
365 static int scpi_linux_errmap[SCPI_ERR_MAX] = {
366 /* better than switch case as long as return value is continuous */
367 0, /* SCPI_SUCCESS */
368 -EINVAL, /* SCPI_ERR_PARAM */
369 -ENOEXEC, /* SCPI_ERR_ALIGN */
370 -EMSGSIZE, /* SCPI_ERR_SIZE */
371 -EINVAL, /* SCPI_ERR_HANDLER */
372 -EACCES, /* SCPI_ERR_ACCESS */
373 -ERANGE, /* SCPI_ERR_RANGE */
374 -ETIMEDOUT, /* SCPI_ERR_TIMEOUT */
375 -ENOMEM, /* SCPI_ERR_NOMEM */
376 -EINVAL, /* SCPI_ERR_PWRSTATE */
377 -EOPNOTSUPP, /* SCPI_ERR_SUPPORT */
378 -EIO, /* SCPI_ERR_DEVICE */
379 -EBUSY, /* SCPI_ERR_BUSY */
380 };
381
382 static inline int scpi_to_linux_errno(int errno)
383 {
384 if (errno >= SCPI_SUCCESS && errno < SCPI_ERR_MAX)
385 return scpi_linux_errmap[errno];
386 return -EIO;
387 }
388
389 static void scpi_process_cmd(struct scpi_chan *ch, u32 cmd)
390 {
391 unsigned long flags;
392 struct scpi_xfer *t, *match = NULL;
393
394 spin_lock_irqsave(&ch->rx_lock, flags);
395 if (list_empty(&ch->rx_pending)) {
396 spin_unlock_irqrestore(&ch->rx_lock, flags);
397 return;
398 }
399
400 /* Command type is not replied by the SCP Firmware in legacy Mode
401 * We should consider that command is the head of pending RX commands
402 * if the list is not empty. In TX only mode, the list would be empty.
403 */
404 if (scpi_info->is_legacy) {
405 match = list_first_entry(&ch->rx_pending, struct scpi_xfer,
406 node);
407 list_del(&match->node);
408 } else {
409 list_for_each_entry(t, &ch->rx_pending, node)
410 if (CMD_XTRACT_UNIQ(t->cmd) == CMD_XTRACT_UNIQ(cmd)) {
411 list_del(&t->node);
412 match = t;
413 break;
414 }
415 }
416 /* check if wait_for_completion is in progress or timed-out */
417 if (match && !completion_done(&match->done)) {
418 unsigned int len;
419
420 if (scpi_info->is_legacy) {
421 struct legacy_scpi_shared_mem *mem = ch->rx_payload;
422
423 /* RX Length is not replied by the legacy Firmware */
424 len = match->rx_len;
425
426 match->status = le32_to_cpu(mem->status);
427 memcpy_fromio(match->rx_buf, mem->payload, len);
428 } else {
429 struct scpi_shared_mem *mem = ch->rx_payload;
430
431 len = min(match->rx_len, CMD_SIZE(cmd));
432
433 match->status = le32_to_cpu(mem->status);
434 memcpy_fromio(match->rx_buf, mem->payload, len);
435 }
436
437 if (match->rx_len > len)
438 memset(match->rx_buf + len, 0, match->rx_len - len);
439 complete(&match->done);
440 }
441 spin_unlock_irqrestore(&ch->rx_lock, flags);
442 }
443
444 static void scpi_handle_remote_msg(struct mbox_client *c, void *msg)
445 {
446 struct scpi_chan *ch = container_of(c, struct scpi_chan, cl);
447 struct scpi_shared_mem *mem = ch->rx_payload;
448 u32 cmd = 0;
449
450 if (!scpi_info->is_legacy)
451 cmd = le32_to_cpu(mem->command);
452
453 scpi_process_cmd(ch, cmd);
454 }
455
456 static void scpi_tx_prepare(struct mbox_client *c, void *msg)
457 {
458 unsigned long flags;
459 struct scpi_xfer *t = msg;
460 struct scpi_chan *ch = container_of(c, struct scpi_chan, cl);
461 struct scpi_shared_mem *mem = (struct scpi_shared_mem *)ch->tx_payload;
462
463 if (t->tx_buf) {
464 if (scpi_info->is_legacy)
465 memcpy_toio(ch->tx_payload, t->tx_buf, t->tx_len);
466 else
467 memcpy_toio(mem->payload, t->tx_buf, t->tx_len);
468 }
469
470 if (t->rx_buf) {
471 if (!(++ch->token))
472 ++ch->token;
473 ADD_SCPI_TOKEN(t->cmd, ch->token);
474 spin_lock_irqsave(&ch->rx_lock, flags);
475 list_add_tail(&t->node, &ch->rx_pending);
476 spin_unlock_irqrestore(&ch->rx_lock, flags);
477 }
478
479 if (!scpi_info->is_legacy)
480 mem->command = cpu_to_le32(t->cmd);
481 }
482
483 static struct scpi_xfer *get_scpi_xfer(struct scpi_chan *ch)
484 {
485 struct scpi_xfer *t;
486
487 mutex_lock(&ch->xfers_lock);
488 if (list_empty(&ch->xfers_list)) {
489 mutex_unlock(&ch->xfers_lock);
490 return NULL;
491 }
492 t = list_first_entry(&ch->xfers_list, struct scpi_xfer, node);
493 list_del(&t->node);
494 mutex_unlock(&ch->xfers_lock);
495 return t;
496 }
497
498 static void put_scpi_xfer(struct scpi_xfer *t, struct scpi_chan *ch)
499 {
500 mutex_lock(&ch->xfers_lock);
501 list_add_tail(&t->node, &ch->xfers_list);
502 mutex_unlock(&ch->xfers_lock);
503 }
504
505 static int scpi_send_message(u8 idx, void *tx_buf, unsigned int tx_len,
506 void *rx_buf, unsigned int rx_len)
507 {
508 int ret;
509 u8 chan;
510 u8 cmd;
511 struct scpi_xfer *msg;
512 struct scpi_chan *scpi_chan;
513
514 if (scpi_info->commands[idx] < 0)
515 return -EOPNOTSUPP;
516
517 cmd = scpi_info->commands[idx];
518
519 if (scpi_info->is_legacy)
520 chan = test_bit(cmd, scpi_info->cmd_priority) ? 1 : 0;
521 else
522 chan = atomic_inc_return(&scpi_info->next_chan) %
523 scpi_info->num_chans;
524 scpi_chan = scpi_info->channels + chan;
525
526 msg = get_scpi_xfer(scpi_chan);
527 if (!msg)
528 return -ENOMEM;
529
530 if (scpi_info->is_legacy) {
531 msg->cmd = PACK_LEGACY_SCPI_CMD(cmd, tx_len);
532 msg->slot = msg->cmd;
533 } else {
534 msg->slot = BIT(SCPI_SLOT);
535 msg->cmd = PACK_SCPI_CMD(cmd, tx_len);
536 }
537 msg->tx_buf = tx_buf;
538 msg->tx_len = tx_len;
539 msg->rx_buf = rx_buf;
540 msg->rx_len = rx_len;
541 init_completion(&msg->done);
542
543 ret = mbox_send_message(scpi_chan->chan, msg);
544 if (ret < 0 || !rx_buf)
545 goto out;
546
547 if (!wait_for_completion_timeout(&msg->done, MAX_RX_TIMEOUT))
548 ret = -ETIMEDOUT;
549 else
550 /* first status word */
551 ret = msg->status;
552 out:
553 if (ret < 0 && rx_buf) /* remove entry from the list if timed-out */
554 scpi_process_cmd(scpi_chan, msg->cmd);
555
556 put_scpi_xfer(msg, scpi_chan);
557 /* SCPI error codes > 0, translate them to Linux scale*/
558 return ret > 0 ? scpi_to_linux_errno(ret) : ret;
559 }
560
561 static u32 scpi_get_version(void)
562 {
563 return scpi_info->protocol_version;
564 }
565
566 static int
567 scpi_clk_get_range(u16 clk_id, unsigned long *min, unsigned long *max)
568 {
569 int ret;
570 struct clk_get_info clk;
571 __le16 le_clk_id = cpu_to_le16(clk_id);
572
573 ret = scpi_send_message(CMD_GET_CLOCK_INFO, &le_clk_id,
574 sizeof(le_clk_id), &clk, sizeof(clk));
575 if (!ret) {
576 *min = le32_to_cpu(clk.min_rate);
577 *max = le32_to_cpu(clk.max_rate);
578 }
579 return ret;
580 }
581
582 static unsigned long scpi_clk_get_val(u16 clk_id)
583 {
584 int ret;
585 struct clk_get_value clk;
586 __le16 le_clk_id = cpu_to_le16(clk_id);
587
588 ret = scpi_send_message(CMD_GET_CLOCK_VALUE, &le_clk_id,
589 sizeof(le_clk_id), &clk, sizeof(clk));
590
591 return ret ? ret : le32_to_cpu(clk.rate);
592 }
593
594 static int scpi_clk_set_val(u16 clk_id, unsigned long rate)
595 {
596 int stat;
597 struct clk_set_value clk = {
598 .id = cpu_to_le16(clk_id),
599 .rate = cpu_to_le32(rate)
600 };
601
602 return scpi_send_message(CMD_SET_CLOCK_VALUE, &clk, sizeof(clk),
603 &stat, sizeof(stat));
604 }
605
606 static int legacy_scpi_clk_set_val(u16 clk_id, unsigned long rate)
607 {
608 int stat;
609 struct legacy_clk_set_value clk = {
610 .id = cpu_to_le16(clk_id),
611 .rate = cpu_to_le32(rate)
612 };
613
614 return scpi_send_message(CMD_SET_CLOCK_VALUE, &clk, sizeof(clk),
615 &stat, sizeof(stat));
616 }
617
618 static int scpi_dvfs_get_idx(u8 domain)
619 {
620 int ret;
621 u8 dvfs_idx;
622
623 ret = scpi_send_message(CMD_GET_DVFS, &domain, sizeof(domain),
624 &dvfs_idx, sizeof(dvfs_idx));
625
626 return ret ? ret : dvfs_idx;
627 }
628
629 static int scpi_dvfs_set_idx(u8 domain, u8 index)
630 {
631 int stat;
632 struct dvfs_set dvfs = {domain, index};
633
634 return scpi_send_message(CMD_SET_DVFS, &dvfs, sizeof(dvfs),
635 &stat, sizeof(stat));
636 }
637
638 static int opp_cmp_func(const void *opp1, const void *opp2)
639 {
640 const struct scpi_opp *t1 = opp1, *t2 = opp2;
641
642 return t1->freq - t2->freq;
643 }
644
645 static struct scpi_dvfs_info *scpi_dvfs_get_info(u8 domain)
646 {
647 struct scpi_dvfs_info *info;
648 struct scpi_opp *opp;
649 struct dvfs_info buf;
650 int ret, i;
651
652 if (domain >= MAX_DVFS_DOMAINS)
653 return ERR_PTR(-EINVAL);
654
655 if (scpi_info->dvfs[domain]) /* data already populated */
656 return scpi_info->dvfs[domain];
657
658 ret = scpi_send_message(CMD_GET_DVFS_INFO, &domain, sizeof(domain),
659 &buf, sizeof(buf));
660 if (ret)
661 return ERR_PTR(ret);
662
663 info = kmalloc(sizeof(*info), GFP_KERNEL);
664 if (!info)
665 return ERR_PTR(-ENOMEM);
666
667 info->count = DVFS_OPP_COUNT(buf.header);
668 info->latency = DVFS_LATENCY(buf.header) * 1000; /* uS to nS */
669
670 info->opps = kcalloc(info->count, sizeof(*opp), GFP_KERNEL);
671 if (!info->opps) {
672 kfree(info);
673 return ERR_PTR(-ENOMEM);
674 }
675
676 for (i = 0, opp = info->opps; i < info->count; i++, opp++) {
677 opp->freq = le32_to_cpu(buf.opps[i].freq);
678 opp->m_volt = le32_to_cpu(buf.opps[i].m_volt);
679 }
680
681 sort(info->opps, info->count, sizeof(*opp), opp_cmp_func, NULL);
682
683 scpi_info->dvfs[domain] = info;
684 return info;
685 }
686
687 static int scpi_sensor_get_capability(u16 *sensors)
688 {
689 struct sensor_capabilities cap_buf;
690 int ret;
691
692 ret = scpi_send_message(CMD_SENSOR_CAPABILITIES, NULL, 0, &cap_buf,
693 sizeof(cap_buf));
694 if (!ret)
695 *sensors = le16_to_cpu(cap_buf.sensors);
696
697 return ret;
698 }
699
700 static int scpi_sensor_get_info(u16 sensor_id, struct scpi_sensor_info *info)
701 {
702 __le16 id = cpu_to_le16(sensor_id);
703 struct _scpi_sensor_info _info;
704 int ret;
705
706 ret = scpi_send_message(CMD_SENSOR_INFO, &id, sizeof(id),
707 &_info, sizeof(_info));
708 if (!ret) {
709 memcpy(info, &_info, sizeof(*info));
710 info->sensor_id = le16_to_cpu(_info.sensor_id);
711 }
712
713 return ret;
714 }
715
716 static int scpi_sensor_get_value(u16 sensor, u64 *val)
717 {
718 __le16 id = cpu_to_le16(sensor);
719 struct sensor_value buf;
720 int ret;
721
722 ret = scpi_send_message(CMD_SENSOR_VALUE, &id, sizeof(id),
723 &buf, sizeof(buf));
724 if (ret)
725 return ret;
726
727 if (scpi_info->is_legacy)
728 /* only 32-bits supported, hi_val can be junk */
729 *val = le32_to_cpu(buf.lo_val);
730 else
731 *val = (u64)le32_to_cpu(buf.hi_val) << 32 |
732 le32_to_cpu(buf.lo_val);
733
734 return 0;
735 }
736
737 static int scpi_device_get_power_state(u16 dev_id)
738 {
739 int ret;
740 u8 pstate;
741 __le16 id = cpu_to_le16(dev_id);
742
743 ret = scpi_send_message(CMD_GET_DEVICE_PWR_STATE, &id,
744 sizeof(id), &pstate, sizeof(pstate));
745 return ret ? ret : pstate;
746 }
747
748 static int scpi_device_set_power_state(u16 dev_id, u8 pstate)
749 {
750 int stat;
751 struct dev_pstate_set dev_set = {
752 .dev_id = cpu_to_le16(dev_id),
753 .pstate = pstate,
754 };
755
756 return scpi_send_message(CMD_SET_DEVICE_PWR_STATE, &dev_set,
757 sizeof(dev_set), &stat, sizeof(stat));
758 }
759
760 static struct scpi_ops scpi_ops = {
761 .get_version = scpi_get_version,
762 .clk_get_range = scpi_clk_get_range,
763 .clk_get_val = scpi_clk_get_val,
764 .clk_set_val = scpi_clk_set_val,
765 .dvfs_get_idx = scpi_dvfs_get_idx,
766 .dvfs_set_idx = scpi_dvfs_set_idx,
767 .dvfs_get_info = scpi_dvfs_get_info,
768 .sensor_get_capability = scpi_sensor_get_capability,
769 .sensor_get_info = scpi_sensor_get_info,
770 .sensor_get_value = scpi_sensor_get_value,
771 .device_get_power_state = scpi_device_get_power_state,
772 .device_set_power_state = scpi_device_set_power_state,
773 };
774
775 struct scpi_ops *get_scpi_ops(void)
776 {
777 return scpi_info ? scpi_info->scpi_ops : NULL;
778 }
779 EXPORT_SYMBOL_GPL(get_scpi_ops);
780
781 static int scpi_init_versions(struct scpi_drvinfo *info)
782 {
783 int ret;
784 struct scp_capabilities caps;
785
786 ret = scpi_send_message(CMD_SCPI_CAPABILITIES, NULL, 0,
787 &caps, sizeof(caps));
788 if (!ret) {
789 info->protocol_version = le32_to_cpu(caps.protocol_version);
790 info->firmware_version = le32_to_cpu(caps.platform_version);
791 }
792 /* Ignore error if not implemented */
793 if (scpi_info->is_legacy && ret == -EOPNOTSUPP)
794 return 0;
795
796 return ret;
797 }
798
799 static ssize_t protocol_version_show(struct device *dev,
800 struct device_attribute *attr, char *buf)
801 {
802 struct scpi_drvinfo *scpi_info = dev_get_drvdata(dev);
803
804 return sprintf(buf, "%d.%d\n",
805 PROTOCOL_REV_MAJOR(scpi_info->protocol_version),
806 PROTOCOL_REV_MINOR(scpi_info->protocol_version));
807 }
808 static DEVICE_ATTR_RO(protocol_version);
809
810 static ssize_t firmware_version_show(struct device *dev,
811 struct device_attribute *attr, char *buf)
812 {
813 struct scpi_drvinfo *scpi_info = dev_get_drvdata(dev);
814
815 return sprintf(buf, "%d.%d.%d\n",
816 FW_REV_MAJOR(scpi_info->firmware_version),
817 FW_REV_MINOR(scpi_info->firmware_version),
818 FW_REV_PATCH(scpi_info->firmware_version));
819 }
820 static DEVICE_ATTR_RO(firmware_version);
821
822 static struct attribute *versions_attrs[] = {
823 &dev_attr_firmware_version.attr,
824 &dev_attr_protocol_version.attr,
825 NULL,
826 };
827 ATTRIBUTE_GROUPS(versions);
828
829 static void
830 scpi_free_channels(struct device *dev, struct scpi_chan *pchan, int count)
831 {
832 int i;
833
834 for (i = 0; i < count && pchan->chan; i++, pchan++) {
835 mbox_free_channel(pchan->chan);
836 devm_kfree(dev, pchan->xfers);
837 devm_iounmap(dev, pchan->rx_payload);
838 }
839 }
840
841 static int scpi_remove(struct platform_device *pdev)
842 {
843 int i;
844 struct device *dev = &pdev->dev;
845 struct scpi_drvinfo *info = platform_get_drvdata(pdev);
846
847 scpi_info = NULL; /* stop exporting SCPI ops through get_scpi_ops */
848
849 of_platform_depopulate(dev);
850 sysfs_remove_groups(&dev->kobj, versions_groups);
851 scpi_free_channels(dev, info->channels, info->num_chans);
852 platform_set_drvdata(pdev, NULL);
853
854 for (i = 0; i < MAX_DVFS_DOMAINS && info->dvfs[i]; i++) {
855 kfree(info->dvfs[i]->opps);
856 kfree(info->dvfs[i]);
857 }
858 devm_kfree(dev, info->channels);
859 devm_kfree(dev, info);
860
861 return 0;
862 }
863
864 #define MAX_SCPI_XFERS 10
865 static int scpi_alloc_xfer_list(struct device *dev, struct scpi_chan *ch)
866 {
867 int i;
868 struct scpi_xfer *xfers;
869
870 xfers = devm_kzalloc(dev, MAX_SCPI_XFERS * sizeof(*xfers), GFP_KERNEL);
871 if (!xfers)
872 return -ENOMEM;
873
874 ch->xfers = xfers;
875 for (i = 0; i < MAX_SCPI_XFERS; i++, xfers++)
876 list_add_tail(&xfers->node, &ch->xfers_list);
877 return 0;
878 }
879
880 static const struct of_device_id legacy_scpi_of_match[] = {
881 {.compatible = "arm,scpi-pre-1.0"},
882 {},
883 };
884
885 static int scpi_probe(struct platform_device *pdev)
886 {
887 int count, idx, ret;
888 struct resource res;
889 struct scpi_chan *scpi_chan;
890 struct device *dev = &pdev->dev;
891 struct device_node *np = dev->of_node;
892
893 scpi_info = devm_kzalloc(dev, sizeof(*scpi_info), GFP_KERNEL);
894 if (!scpi_info)
895 return -ENOMEM;
896
897 if (of_match_device(legacy_scpi_of_match, &pdev->dev))
898 scpi_info->is_legacy = true;
899
900 count = of_count_phandle_with_args(np, "mboxes", "#mbox-cells");
901 if (count < 0) {
902 dev_err(dev, "no mboxes property in '%s'\n", np->full_name);
903 return -ENODEV;
904 }
905
906 scpi_chan = devm_kcalloc(dev, count, sizeof(*scpi_chan), GFP_KERNEL);
907 if (!scpi_chan)
908 return -ENOMEM;
909
910 for (idx = 0; idx < count; idx++) {
911 resource_size_t size;
912 struct scpi_chan *pchan = scpi_chan + idx;
913 struct mbox_client *cl = &pchan->cl;
914 struct device_node *shmem = of_parse_phandle(np, "shmem", idx);
915
916 ret = of_address_to_resource(shmem, 0, &res);
917 of_node_put(shmem);
918 if (ret) {
919 dev_err(dev, "failed to get SCPI payload mem resource\n");
920 goto err;
921 }
922
923 size = resource_size(&res);
924 pchan->rx_payload = devm_ioremap(dev, res.start, size);
925 if (!pchan->rx_payload) {
926 dev_err(dev, "failed to ioremap SCPI payload\n");
927 ret = -EADDRNOTAVAIL;
928 goto err;
929 }
930 pchan->tx_payload = pchan->rx_payload + (size >> 1);
931
932 cl->dev = dev;
933 cl->rx_callback = scpi_handle_remote_msg;
934 cl->tx_prepare = scpi_tx_prepare;
935 cl->tx_block = true;
936 cl->tx_tout = 20;
937 cl->knows_txdone = false; /* controller can't ack */
938
939 INIT_LIST_HEAD(&pchan->rx_pending);
940 INIT_LIST_HEAD(&pchan->xfers_list);
941 spin_lock_init(&pchan->rx_lock);
942 mutex_init(&pchan->xfers_lock);
943
944 ret = scpi_alloc_xfer_list(dev, pchan);
945 if (!ret) {
946 pchan->chan = mbox_request_channel(cl, idx);
947 if (!IS_ERR(pchan->chan))
948 continue;
949 ret = PTR_ERR(pchan->chan);
950 if (ret != -EPROBE_DEFER)
951 dev_err(dev, "failed to get channel%d err %d\n",
952 idx, ret);
953 }
954 err:
955 scpi_free_channels(dev, scpi_chan, idx);
956 scpi_info = NULL;
957 return ret;
958 }
959
960 scpi_info->channels = scpi_chan;
961 scpi_info->num_chans = count;
962 scpi_info->commands = scpi_std_commands;
963
964 platform_set_drvdata(pdev, scpi_info);
965
966 if (scpi_info->is_legacy) {
967 /* Replace with legacy variants */
968 scpi_ops.clk_set_val = legacy_scpi_clk_set_val;
969 scpi_info->commands = scpi_legacy_commands;
970
971 /* Fill priority bitmap */
972 for (idx = 0; idx < ARRAY_SIZE(legacy_hpriority_cmds); idx++)
973 set_bit(legacy_hpriority_cmds[idx],
974 scpi_info->cmd_priority);
975 }
976
977 ret = scpi_init_versions(scpi_info);
978 if (ret) {
979 dev_err(dev, "incorrect or no SCP firmware found\n");
980 scpi_remove(pdev);
981 return ret;
982 }
983
984 _dev_info(dev, "SCP Protocol %d.%d Firmware %d.%d.%d version\n",
985 PROTOCOL_REV_MAJOR(scpi_info->protocol_version),
986 PROTOCOL_REV_MINOR(scpi_info->protocol_version),
987 FW_REV_MAJOR(scpi_info->firmware_version),
988 FW_REV_MINOR(scpi_info->firmware_version),
989 FW_REV_PATCH(scpi_info->firmware_version));
990 scpi_info->scpi_ops = &scpi_ops;
991
992 ret = sysfs_create_groups(&dev->kobj, versions_groups);
993 if (ret)
994 dev_err(dev, "unable to create sysfs version group\n");
995
996 return of_platform_populate(dev->of_node, NULL, NULL, dev);
997 }
998
999 static const struct of_device_id scpi_of_match[] = {
1000 {.compatible = "arm,scpi"},
1001 {.compatible = "arm,scpi-pre-1.0"},
1002 {},
1003 };
1004
1005 MODULE_DEVICE_TABLE(of, scpi_of_match);
1006
1007 static struct platform_driver scpi_driver = {
1008 .driver = {
1009 .name = "scpi_protocol",
1010 .of_match_table = scpi_of_match,
1011 },
1012 .probe = scpi_probe,
1013 .remove = scpi_remove,
1014 };
1015 module_platform_driver(scpi_driver);
1016
1017 MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
1018 MODULE_DESCRIPTION("ARM SCPI mailbox protocol driver");
1019 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support