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7ed98ddd EJ |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | ||
3 | #include <linux/device.h> | |
4 | #include <linux/err.h> | |
5 | #include <linux/errno.h> | |
6 | #include <linux/fs.h> | |
7 | #include <linux/fsi-sbefifo.h> | |
8 | #include <linux/gfp.h> | |
9 | #include <linux/idr.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/list.h> | |
12 | #include <linux/miscdevice.h> | |
008d3825 | 13 | #include <linux/mm.h> |
7ed98ddd EJ |
14 | #include <linux/module.h> |
15 | #include <linux/mutex.h> | |
16 | #include <linux/fsi-occ.h> | |
17 | #include <linux/of.h> | |
5ec96d74 | 18 | #include <linux/of_device.h> |
7ed98ddd EJ |
19 | #include <linux/platform_device.h> |
20 | #include <linux/sched.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <asm/unaligned.h> | |
24 | ||
25 | #define OCC_SRAM_BYTES 4096 | |
26 | #define OCC_CMD_DATA_BYTES 4090 | |
27 | #define OCC_RESP_DATA_BYTES 4089 | |
28 | ||
5ec96d74 EJ |
29 | #define OCC_P9_SRAM_CMD_ADDR 0xFFFBE000 |
30 | #define OCC_P9_SRAM_RSP_ADDR 0xFFFBF000 | |
31 | ||
32 | #define OCC_P10_SRAM_CMD_ADDR 0xFFFFD000 | |
33 | #define OCC_P10_SRAM_RSP_ADDR 0xFFFFE000 | |
34 | ||
35 | #define OCC_P10_SRAM_MODE 0x58 /* Normal mode, OCB channel 2 */ | |
7ed98ddd | 36 | |
7ed98ddd EJ |
37 | #define OCC_TIMEOUT_MS 1000 |
38 | #define OCC_CMD_IN_PRG_WAIT_MS 50 | |
39 | ||
5ec96d74 EJ |
40 | enum versions { occ_p9, occ_p10 }; |
41 | ||
7ed98ddd EJ |
42 | struct occ { |
43 | struct device *dev; | |
44 | struct device *sbefifo; | |
45 | char name[32]; | |
46 | int idx; | |
62f79f3d | 47 | u8 sequence_number; |
008d3825 | 48 | void *buffer; |
8ec3cc9f EJ |
49 | void *client_buffer; |
50 | size_t client_buffer_size; | |
51 | size_t client_response_size; | |
5ec96d74 | 52 | enum versions version; |
7ed98ddd EJ |
53 | struct miscdevice mdev; |
54 | struct mutex occ_lock; | |
55 | }; | |
56 | ||
57 | #define to_occ(x) container_of((x), struct occ, mdev) | |
58 | ||
59 | struct occ_response { | |
60 | u8 seq_no; | |
61 | u8 cmd_type; | |
62 | u8 return_status; | |
63 | __be16 data_length; | |
64 | u8 data[OCC_RESP_DATA_BYTES + 2]; /* two bytes checksum */ | |
65 | } __packed; | |
66 | ||
67 | struct occ_client { | |
68 | struct occ *occ; | |
69 | struct mutex lock; | |
70 | size_t data_size; | |
71 | size_t read_offset; | |
72 | u8 *buffer; | |
73 | }; | |
74 | ||
75 | #define to_client(x) container_of((x), struct occ_client, xfr) | |
76 | ||
77 | static DEFINE_IDA(occ_ida); | |
78 | ||
79 | static int occ_open(struct inode *inode, struct file *file) | |
80 | { | |
81 | struct occ_client *client = kzalloc(sizeof(*client), GFP_KERNEL); | |
82 | struct miscdevice *mdev = file->private_data; | |
83 | struct occ *occ = to_occ(mdev); | |
84 | ||
85 | if (!client) | |
86 | return -ENOMEM; | |
87 | ||
88 | client->buffer = (u8 *)__get_free_page(GFP_KERNEL); | |
89 | if (!client->buffer) { | |
90 | kfree(client); | |
91 | return -ENOMEM; | |
92 | } | |
93 | ||
94 | client->occ = occ; | |
95 | mutex_init(&client->lock); | |
96 | file->private_data = client; | |
97 | ||
98 | /* We allocate a 1-page buffer, make sure it all fits */ | |
99 | BUILD_BUG_ON((OCC_CMD_DATA_BYTES + 3) > PAGE_SIZE); | |
100 | BUILD_BUG_ON((OCC_RESP_DATA_BYTES + 7) > PAGE_SIZE); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static ssize_t occ_read(struct file *file, char __user *buf, size_t len, | |
106 | loff_t *offset) | |
107 | { | |
108 | struct occ_client *client = file->private_data; | |
109 | ssize_t rc = 0; | |
110 | ||
111 | if (!client) | |
112 | return -ENODEV; | |
113 | ||
114 | if (len > OCC_SRAM_BYTES) | |
115 | return -EINVAL; | |
116 | ||
117 | mutex_lock(&client->lock); | |
118 | ||
119 | /* This should not be possible ... */ | |
120 | if (WARN_ON_ONCE(client->read_offset > client->data_size)) { | |
121 | rc = -EIO; | |
122 | goto done; | |
123 | } | |
124 | ||
125 | /* Grab how much data we have to read */ | |
126 | rc = min(len, client->data_size - client->read_offset); | |
127 | if (copy_to_user(buf, client->buffer + client->read_offset, rc)) | |
128 | rc = -EFAULT; | |
129 | else | |
130 | client->read_offset += rc; | |
131 | ||
132 | done: | |
133 | mutex_unlock(&client->lock); | |
134 | ||
135 | return rc; | |
136 | } | |
137 | ||
138 | static ssize_t occ_write(struct file *file, const char __user *buf, | |
139 | size_t len, loff_t *offset) | |
140 | { | |
141 | struct occ_client *client = file->private_data; | |
142 | size_t rlen, data_length; | |
62f79f3d | 143 | ssize_t rc; |
7ed98ddd EJ |
144 | u8 *cmd; |
145 | ||
146 | if (!client) | |
147 | return -ENODEV; | |
148 | ||
149 | if (len > (OCC_CMD_DATA_BYTES + 3) || len < 3) | |
150 | return -EINVAL; | |
151 | ||
152 | mutex_lock(&client->lock); | |
153 | ||
154 | /* Construct the command */ | |
155 | cmd = client->buffer; | |
156 | ||
7ed98ddd EJ |
157 | /* |
158 | * Copy the user command (assume user data follows the occ command | |
159 | * format) | |
160 | * byte 0: command type | |
161 | * bytes 1-2: data length (msb first) | |
162 | * bytes 3-n: data | |
163 | */ | |
164 | if (copy_from_user(&cmd[1], buf, len)) { | |
165 | rc = -EFAULT; | |
166 | goto done; | |
167 | } | |
168 | ||
169 | /* Extract data length */ | |
170 | data_length = (cmd[2] << 8) + cmd[3]; | |
171 | if (data_length > OCC_CMD_DATA_BYTES) { | |
172 | rc = -EINVAL; | |
173 | goto done; | |
174 | } | |
175 | ||
62f79f3d | 176 | /* Submit command; 4 bytes before the data and 2 bytes after */ |
7ed98ddd EJ |
177 | rlen = PAGE_SIZE; |
178 | rc = fsi_occ_submit(client->occ->dev, cmd, data_length + 6, cmd, | |
179 | &rlen); | |
180 | if (rc) | |
181 | goto done; | |
182 | ||
183 | /* Set read tracking data */ | |
184 | client->data_size = rlen; | |
185 | client->read_offset = 0; | |
186 | ||
187 | /* Done */ | |
188 | rc = len; | |
189 | ||
190 | done: | |
191 | mutex_unlock(&client->lock); | |
192 | ||
193 | return rc; | |
194 | } | |
195 | ||
196 | static int occ_release(struct inode *inode, struct file *file) | |
197 | { | |
198 | struct occ_client *client = file->private_data; | |
199 | ||
200 | free_page((unsigned long)client->buffer); | |
201 | kfree(client); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static const struct file_operations occ_fops = { | |
207 | .owner = THIS_MODULE, | |
208 | .open = occ_open, | |
209 | .read = occ_read, | |
210 | .write = occ_write, | |
211 | .release = occ_release, | |
212 | }; | |
213 | ||
8ec3cc9f EJ |
214 | static void occ_save_ffdc(struct occ *occ, __be32 *resp, size_t parsed_len, |
215 | size_t resp_len) | |
216 | { | |
217 | if (resp_len > parsed_len) { | |
218 | size_t dh = resp_len - parsed_len; | |
219 | size_t ffdc_len = (dh - 1) * 4; /* SBE words are four bytes */ | |
220 | __be32 *ffdc = &resp[parsed_len]; | |
221 | ||
222 | if (ffdc_len > occ->client_buffer_size) | |
223 | ffdc_len = occ->client_buffer_size; | |
224 | ||
225 | memcpy(occ->client_buffer, ffdc, ffdc_len); | |
226 | occ->client_response_size = ffdc_len; | |
227 | } | |
228 | } | |
229 | ||
614f0a50 EJ |
230 | static int occ_verify_checksum(struct occ *occ, struct occ_response *resp, |
231 | u16 data_length) | |
7ed98ddd EJ |
232 | { |
233 | /* Fetch the two bytes after the data for the checksum. */ | |
234 | u16 checksum_resp = get_unaligned_be16(&resp->data[data_length]); | |
235 | u16 checksum; | |
236 | u16 i; | |
237 | ||
238 | checksum = resp->seq_no; | |
239 | checksum += resp->cmd_type; | |
240 | checksum += resp->return_status; | |
241 | checksum += (data_length >> 8) + (data_length & 0xFF); | |
242 | ||
243 | for (i = 0; i < data_length; ++i) | |
244 | checksum += resp->data[i]; | |
245 | ||
614f0a50 EJ |
246 | if (checksum != checksum_resp) { |
247 | dev_err(occ->dev, "Bad checksum: %04x!=%04x\n", checksum, | |
248 | checksum_resp); | |
7ed98ddd | 249 | return -EBADMSG; |
614f0a50 | 250 | } |
7ed98ddd EJ |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
5ec96d74 | 255 | static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) |
7ed98ddd EJ |
256 | { |
257 | u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ | |
8ec3cc9f | 258 | size_t cmd_len, parsed_len, resp_data_len; |
008d3825 EJ |
259 | size_t resp_len = OCC_MAX_RESP_WORDS; |
260 | __be32 *resp = occ->buffer; | |
261 | __be32 cmd[6]; | |
5ec96d74 | 262 | int idx = 0, rc; |
7ed98ddd EJ |
263 | |
264 | /* | |
265 | * Magic sequence to do SBE getsram command. SBE will fetch data from | |
266 | * specified SRAM address. | |
267 | */ | |
5ec96d74 EJ |
268 | switch (occ->version) { |
269 | default: | |
270 | case occ_p9: | |
271 | cmd_len = 5; | |
272 | cmd[2] = cpu_to_be32(1); /* Normal mode */ | |
273 | cmd[3] = cpu_to_be32(OCC_P9_SRAM_RSP_ADDR + offset); | |
274 | break; | |
275 | case occ_p10: | |
276 | idx = 1; | |
277 | cmd_len = 6; | |
278 | cmd[2] = cpu_to_be32(OCC_P10_SRAM_MODE); | |
279 | cmd[3] = 0; | |
280 | cmd[4] = cpu_to_be32(OCC_P10_SRAM_RSP_ADDR + offset); | |
281 | break; | |
282 | } | |
283 | ||
284 | cmd[0] = cpu_to_be32(cmd_len); | |
7ed98ddd | 285 | cmd[1] = cpu_to_be32(SBEFIFO_CMD_GET_OCC_SRAM); |
5ec96d74 | 286 | cmd[4 + idx] = cpu_to_be32(data_len); |
7ed98ddd | 287 | |
5ec96d74 | 288 | rc = sbefifo_submit(occ->sbefifo, cmd, cmd_len, resp, &resp_len); |
7ed98ddd | 289 | if (rc) |
008d3825 | 290 | return rc; |
7ed98ddd EJ |
291 | |
292 | rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_GET_OCC_SRAM, | |
8ec3cc9f | 293 | resp, resp_len, &parsed_len); |
008d3825 EJ |
294 | if (rc > 0) { |
295 | dev_err(occ->dev, "SRAM read returned failure status: %08x\n", | |
296 | rc); | |
8ec3cc9f EJ |
297 | occ_save_ffdc(occ, resp, parsed_len, resp_len); |
298 | return -ECOMM; | |
008d3825 EJ |
299 | } else if (rc) { |
300 | return rc; | |
301 | } | |
7ed98ddd | 302 | |
8ec3cc9f | 303 | resp_data_len = be32_to_cpu(resp[parsed_len - 1]); |
7ed98ddd EJ |
304 | if (resp_data_len != data_len) { |
305 | dev_err(occ->dev, "SRAM read expected %d bytes got %zd\n", | |
306 | data_len, resp_data_len); | |
307 | rc = -EBADMSG; | |
308 | } else { | |
309 | memcpy(data, resp, len); | |
310 | } | |
311 | ||
7ed98ddd EJ |
312 | return rc; |
313 | } | |
314 | ||
62f79f3d EJ |
315 | static int occ_putsram(struct occ *occ, const void *data, ssize_t len, |
316 | u8 seq_no, u16 checksum) | |
7ed98ddd | 317 | { |
7ed98ddd | 318 | u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ |
8ec3cc9f | 319 | size_t cmd_len, parsed_len, resp_data_len; |
008d3825 EJ |
320 | size_t resp_len = OCC_MAX_RESP_WORDS; |
321 | __be32 *buf = occ->buffer; | |
62f79f3d | 322 | u8 *byte_buf; |
5ec96d74 EJ |
323 | int idx = 0, rc; |
324 | ||
325 | cmd_len = (occ->version == occ_p10) ? 6 : 5; | |
5ec96d74 | 326 | cmd_len += data_len >> 2; |
7ed98ddd EJ |
327 | |
328 | /* | |
329 | * Magic sequence to do SBE putsram command. SBE will transfer | |
330 | * data to specified SRAM address. | |
331 | */ | |
332 | buf[0] = cpu_to_be32(cmd_len); | |
333 | buf[1] = cpu_to_be32(SBEFIFO_CMD_PUT_OCC_SRAM); | |
7ed98ddd | 334 | |
5ec96d74 EJ |
335 | switch (occ->version) { |
336 | default: | |
337 | case occ_p9: | |
338 | buf[2] = cpu_to_be32(1); /* Normal mode */ | |
339 | buf[3] = cpu_to_be32(OCC_P9_SRAM_CMD_ADDR); | |
340 | break; | |
341 | case occ_p10: | |
342 | idx = 1; | |
343 | buf[2] = cpu_to_be32(OCC_P10_SRAM_MODE); | |
344 | buf[3] = 0; | |
345 | buf[4] = cpu_to_be32(OCC_P10_SRAM_CMD_ADDR); | |
346 | break; | |
347 | } | |
348 | ||
349 | buf[4 + idx] = cpu_to_be32(data_len); | |
350 | memcpy(&buf[5 + idx], data, len); | |
7ed98ddd | 351 | |
62f79f3d EJ |
352 | byte_buf = (u8 *)&buf[5 + idx]; |
353 | /* | |
354 | * Overwrite the first byte with our sequence number and the last two | |
355 | * bytes with the checksum. | |
356 | */ | |
357 | byte_buf[0] = seq_no; | |
358 | byte_buf[len - 2] = checksum >> 8; | |
359 | byte_buf[len - 1] = checksum & 0xff; | |
360 | ||
7ed98ddd EJ |
361 | rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); |
362 | if (rc) | |
008d3825 | 363 | return rc; |
7ed98ddd EJ |
364 | |
365 | rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, | |
8ec3cc9f | 366 | buf, resp_len, &parsed_len); |
008d3825 EJ |
367 | if (rc > 0) { |
368 | dev_err(occ->dev, "SRAM write returned failure status: %08x\n", | |
369 | rc); | |
8ec3cc9f EJ |
370 | occ_save_ffdc(occ, buf, parsed_len, resp_len); |
371 | return -ECOMM; | |
008d3825 EJ |
372 | } else if (rc) { |
373 | return rc; | |
374 | } | |
7ed98ddd | 375 | |
8ec3cc9f | 376 | if (parsed_len != 1) { |
7ed98ddd | 377 | dev_err(occ->dev, "SRAM write response length invalid: %zd\n", |
8ec3cc9f | 378 | parsed_len); |
7ed98ddd EJ |
379 | rc = -EBADMSG; |
380 | } else { | |
381 | resp_data_len = be32_to_cpu(buf[0]); | |
382 | if (resp_data_len != data_len) { | |
383 | dev_err(occ->dev, | |
384 | "SRAM write expected %d bytes got %zd\n", | |
385 | data_len, resp_data_len); | |
386 | rc = -EBADMSG; | |
387 | } | |
388 | } | |
389 | ||
7ed98ddd EJ |
390 | return rc; |
391 | } | |
392 | ||
393 | static int occ_trigger_attn(struct occ *occ) | |
394 | { | |
008d3825 | 395 | __be32 *buf = occ->buffer; |
8ec3cc9f | 396 | size_t cmd_len, parsed_len, resp_data_len; |
008d3825 | 397 | size_t resp_len = OCC_MAX_RESP_WORDS; |
5ec96d74 | 398 | int idx = 0, rc; |
7ed98ddd | 399 | |
5ec96d74 EJ |
400 | switch (occ->version) { |
401 | default: | |
402 | case occ_p9: | |
403 | cmd_len = 7; | |
404 | buf[2] = cpu_to_be32(3); /* Circular mode */ | |
405 | buf[3] = 0; | |
406 | break; | |
407 | case occ_p10: | |
408 | idx = 1; | |
409 | cmd_len = 8; | |
410 | buf[2] = cpu_to_be32(0xd0); /* Circular mode, OCB Channel 1 */ | |
411 | buf[3] = 0; | |
412 | buf[4] = 0; | |
413 | break; | |
414 | } | |
415 | ||
416 | buf[0] = cpu_to_be32(cmd_len); /* Chip-op length in words */ | |
7ed98ddd | 417 | buf[1] = cpu_to_be32(SBEFIFO_CMD_PUT_OCC_SRAM); |
5ec96d74 EJ |
418 | buf[4 + idx] = cpu_to_be32(8); /* Data length in bytes */ |
419 | buf[5 + idx] = cpu_to_be32(0x20010000); /* Trigger OCC attention */ | |
420 | buf[6 + idx] = 0; | |
7ed98ddd | 421 | |
5ec96d74 | 422 | rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); |
7ed98ddd | 423 | if (rc) |
008d3825 | 424 | return rc; |
7ed98ddd EJ |
425 | |
426 | rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, | |
8ec3cc9f | 427 | buf, resp_len, &parsed_len); |
008d3825 EJ |
428 | if (rc > 0) { |
429 | dev_err(occ->dev, "SRAM attn returned failure status: %08x\n", | |
430 | rc); | |
8ec3cc9f EJ |
431 | occ_save_ffdc(occ, buf, parsed_len, resp_len); |
432 | return -ECOMM; | |
008d3825 EJ |
433 | } else if (rc) { |
434 | return rc; | |
435 | } | |
7ed98ddd | 436 | |
8ec3cc9f | 437 | if (parsed_len != 1) { |
7ed98ddd | 438 | dev_err(occ->dev, "SRAM attn response length invalid: %zd\n", |
8ec3cc9f | 439 | parsed_len); |
7ed98ddd EJ |
440 | rc = -EBADMSG; |
441 | } else { | |
442 | resp_data_len = be32_to_cpu(buf[0]); | |
443 | if (resp_data_len != 8) { | |
444 | dev_err(occ->dev, | |
445 | "SRAM attn expected 8 bytes got %zd\n", | |
446 | resp_data_len); | |
447 | rc = -EBADMSG; | |
448 | } | |
449 | } | |
450 | ||
7ed98ddd EJ |
451 | return rc; |
452 | } | |
453 | ||
3dcf3c84 EJ |
454 | static bool fsi_occ_response_not_ready(struct occ_response *resp, u8 seq_no, |
455 | u8 cmd_type) | |
456 | { | |
457 | return resp->return_status == OCC_RESP_CMD_IN_PRG || | |
458 | resp->return_status == OCC_RESP_CRIT_INIT || | |
459 | resp->seq_no != seq_no || resp->cmd_type != cmd_type; | |
460 | } | |
461 | ||
7ed98ddd EJ |
462 | int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, |
463 | void *response, size_t *resp_len) | |
464 | { | |
465 | const unsigned long timeout = msecs_to_jiffies(OCC_TIMEOUT_MS); | |
466 | const unsigned long wait_time = | |
467 | msecs_to_jiffies(OCC_CMD_IN_PRG_WAIT_MS); | |
468 | struct occ *occ = dev_get_drvdata(dev); | |
469 | struct occ_response *resp = response; | |
8ec3cc9f | 470 | size_t user_resp_len = *resp_len; |
afd26118 | 471 | u8 seq_no; |
3dcf3c84 | 472 | u8 cmd_type; |
62f79f3d | 473 | u16 checksum = 0; |
7ed98ddd | 474 | u16 resp_data_length; |
62f79f3d | 475 | const u8 *byte_request = (const u8 *)request; |
3dcf3c84 | 476 | unsigned long end; |
7ed98ddd | 477 | int rc; |
62f79f3d | 478 | size_t i; |
7ed98ddd | 479 | |
8ec3cc9f EJ |
480 | *resp_len = 0; |
481 | ||
7ed98ddd EJ |
482 | if (!occ) |
483 | return -ENODEV; | |
484 | ||
8ec3cc9f EJ |
485 | if (user_resp_len < 7) { |
486 | dev_dbg(dev, "Bad resplen %zd\n", user_resp_len); | |
7ed98ddd EJ |
487 | return -EINVAL; |
488 | } | |
489 | ||
3dcf3c84 EJ |
490 | cmd_type = byte_request[1]; |
491 | ||
62f79f3d EJ |
492 | /* Checksum the request, ignoring first byte (sequence number). */ |
493 | for (i = 1; i < req_len - 2; ++i) | |
494 | checksum += byte_request[i]; | |
495 | ||
7ed98ddd EJ |
496 | mutex_lock(&occ->occ_lock); |
497 | ||
8ec3cc9f EJ |
498 | occ->client_buffer = response; |
499 | occ->client_buffer_size = user_resp_len; | |
500 | occ->client_response_size = 0; | |
501 | ||
62f79f3d EJ |
502 | /* |
503 | * Get a sequence number and update the counter. Avoid a sequence | |
504 | * number of 0 which would pass the response check below even if the | |
505 | * OCC response is uninitialized. Any sequence number the user is | |
506 | * trying to send is overwritten since this function is the only common | |
507 | * interface to the OCC and therefore the only place we can guarantee | |
508 | * unique sequence numbers. | |
509 | */ | |
510 | seq_no = occ->sequence_number++; | |
511 | if (!occ->sequence_number) | |
512 | occ->sequence_number = 1; | |
513 | checksum += seq_no; | |
514 | ||
515 | rc = occ_putsram(occ, request, req_len, seq_no, checksum); | |
7ed98ddd EJ |
516 | if (rc) |
517 | goto done; | |
518 | ||
519 | rc = occ_trigger_attn(occ); | |
520 | if (rc) | |
521 | goto done; | |
522 | ||
3dcf3c84 EJ |
523 | end = jiffies + timeout; |
524 | while (true) { | |
525 | /* Read occ response header */ | |
5ec96d74 | 526 | rc = occ_getsram(occ, 0, resp, 8); |
7ed98ddd EJ |
527 | if (rc) |
528 | goto done; | |
529 | ||
3dcf3c84 EJ |
530 | if (fsi_occ_response_not_ready(resp, seq_no, cmd_type)) { |
531 | if (time_after(jiffies, end)) { | |
532 | dev_err(occ->dev, | |
533 | "resp timeout status=%02x seq=%d cmd=%d, our seq=%d cmd=%d\n", | |
afd26118 | 534 | resp->return_status, resp->seq_no, |
3dcf3c84 EJ |
535 | resp->cmd_type, seq_no, cmd_type); |
536 | rc = -ETIMEDOUT; | |
afd26118 EJ |
537 | goto done; |
538 | } | |
7ed98ddd EJ |
539 | |
540 | set_current_state(TASK_UNINTERRUPTIBLE); | |
541 | schedule_timeout(wait_time); | |
3dcf3c84 EJ |
542 | } else { |
543 | /* Extract size of response data */ | |
544 | resp_data_length = | |
545 | get_unaligned_be16(&resp->data_length); | |
546 | ||
547 | /* | |
548 | * Message size is data length + 5 bytes header + 2 | |
549 | * bytes checksum | |
550 | */ | |
551 | if ((resp_data_length + 7) > user_resp_len) { | |
552 | rc = -EMSGSIZE; | |
553 | goto done; | |
554 | } | |
7ed98ddd | 555 | |
3dcf3c84 EJ |
556 | /* |
557 | * Get the entire response including the header again, | |
558 | * in case it changed | |
559 | */ | |
560 | if (resp_data_length > 1) { | |
561 | rc = occ_getsram(occ, 0, resp, | |
562 | resp_data_length + 7); | |
563 | if (rc) | |
564 | goto done; | |
565 | ||
566 | if (!fsi_occ_response_not_ready(resp, seq_no, | |
567 | cmd_type)) | |
568 | break; | |
569 | } else { | |
570 | break; | |
571 | } | |
572 | } | |
7ed98ddd EJ |
573 | } |
574 | ||
575 | dev_dbg(dev, "resp_status=%02x resp_data_len=%d\n", | |
576 | resp->return_status, resp_data_length); | |
577 | ||
8ec3cc9f | 578 | occ->client_response_size = resp_data_length + 7; |
614f0a50 | 579 | rc = occ_verify_checksum(occ, resp, resp_data_length); |
7ed98ddd EJ |
580 | |
581 | done: | |
8ec3cc9f | 582 | *resp_len = occ->client_response_size; |
7ed98ddd EJ |
583 | mutex_unlock(&occ->occ_lock); |
584 | ||
585 | return rc; | |
586 | } | |
587 | EXPORT_SYMBOL_GPL(fsi_occ_submit); | |
588 | ||
589 | static int occ_unregister_child(struct device *dev, void *data) | |
590 | { | |
591 | struct platform_device *hwmon_dev = to_platform_device(dev); | |
592 | ||
593 | platform_device_unregister(hwmon_dev); | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | static int occ_probe(struct platform_device *pdev) | |
599 | { | |
600 | int rc; | |
601 | u32 reg; | |
602 | struct occ *occ; | |
603 | struct platform_device *hwmon_dev; | |
604 | struct device *dev = &pdev->dev; | |
605 | struct platform_device_info hwmon_dev_info = { | |
606 | .parent = dev, | |
607 | .name = "occ-hwmon", | |
608 | }; | |
609 | ||
610 | occ = devm_kzalloc(dev, sizeof(*occ), GFP_KERNEL); | |
611 | if (!occ) | |
612 | return -ENOMEM; | |
613 | ||
008d3825 EJ |
614 | /* SBE words are always four bytes */ |
615 | occ->buffer = kvmalloc(OCC_MAX_RESP_WORDS * 4, GFP_KERNEL); | |
616 | if (!occ->buffer) | |
617 | return -ENOMEM; | |
618 | ||
5ec96d74 | 619 | occ->version = (uintptr_t)of_device_get_match_data(dev); |
7ed98ddd EJ |
620 | occ->dev = dev; |
621 | occ->sbefifo = dev->parent; | |
3dcf3c84 EJ |
622 | /* |
623 | * Quickly derive a pseudo-random number from jiffies so that | |
624 | * re-probing the driver doesn't accidentally overlap sequence numbers. | |
625 | */ | |
626 | occ->sequence_number = (u8)((jiffies % 0xff) + 1); | |
7ed98ddd EJ |
627 | mutex_init(&occ->occ_lock); |
628 | ||
629 | if (dev->of_node) { | |
630 | rc = of_property_read_u32(dev->of_node, "reg", ®); | |
631 | if (!rc) { | |
632 | /* make sure we don't have a duplicate from dts */ | |
633 | occ->idx = ida_simple_get(&occ_ida, reg, reg + 1, | |
634 | GFP_KERNEL); | |
635 | if (occ->idx < 0) | |
636 | occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, | |
637 | GFP_KERNEL); | |
638 | } else { | |
639 | occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, | |
640 | GFP_KERNEL); | |
641 | } | |
642 | } else { | |
643 | occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, GFP_KERNEL); | |
644 | } | |
645 | ||
646 | platform_set_drvdata(pdev, occ); | |
647 | ||
648 | snprintf(occ->name, sizeof(occ->name), "occ%d", occ->idx); | |
649 | occ->mdev.fops = &occ_fops; | |
650 | occ->mdev.minor = MISC_DYNAMIC_MINOR; | |
651 | occ->mdev.name = occ->name; | |
652 | occ->mdev.parent = dev; | |
653 | ||
654 | rc = misc_register(&occ->mdev); | |
655 | if (rc) { | |
656 | dev_err(dev, "failed to register miscdevice: %d\n", rc); | |
657 | ida_simple_remove(&occ_ida, occ->idx); | |
008d3825 | 658 | kvfree(occ->buffer); |
7ed98ddd EJ |
659 | return rc; |
660 | } | |
661 | ||
662 | hwmon_dev_info.id = occ->idx; | |
663 | hwmon_dev = platform_device_register_full(&hwmon_dev_info); | |
3c3c4848 | 664 | if (IS_ERR(hwmon_dev)) |
7ed98ddd EJ |
665 | dev_warn(dev, "failed to create hwmon device\n"); |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
670 | static int occ_remove(struct platform_device *pdev) | |
671 | { | |
672 | struct occ *occ = platform_get_drvdata(pdev); | |
673 | ||
008d3825 EJ |
674 | kvfree(occ->buffer); |
675 | ||
7ed98ddd EJ |
676 | misc_deregister(&occ->mdev); |
677 | ||
678 | device_for_each_child(&pdev->dev, NULL, occ_unregister_child); | |
679 | ||
680 | ida_simple_remove(&occ_ida, occ->idx); | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
685 | static const struct of_device_id occ_match[] = { | |
5ec96d74 EJ |
686 | { |
687 | .compatible = "ibm,p9-occ", | |
688 | .data = (void *)occ_p9 | |
689 | }, | |
690 | { | |
691 | .compatible = "ibm,p10-occ", | |
692 | .data = (void *)occ_p10 | |
693 | }, | |
7ed98ddd EJ |
694 | { }, |
695 | }; | |
19a52178 | 696 | MODULE_DEVICE_TABLE(of, occ_match); |
7ed98ddd EJ |
697 | |
698 | static struct platform_driver occ_driver = { | |
699 | .driver = { | |
700 | .name = "occ", | |
701 | .of_match_table = occ_match, | |
702 | }, | |
703 | .probe = occ_probe, | |
704 | .remove = occ_remove, | |
705 | }; | |
706 | ||
707 | static int occ_init(void) | |
708 | { | |
709 | return platform_driver_register(&occ_driver); | |
710 | } | |
711 | ||
712 | static void occ_exit(void) | |
713 | { | |
714 | platform_driver_unregister(&occ_driver); | |
715 | ||
716 | ida_destroy(&occ_ida); | |
717 | } | |
718 | ||
719 | module_init(occ_init); | |
720 | module_exit(occ_exit); | |
721 | ||
722 | MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>"); | |
723 | MODULE_DESCRIPTION("BMC P9 OCC driver"); | |
724 | MODULE_LICENSE("GPL"); |