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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; | |
d3e1e246 | 97 | get_device(occ->dev); |
7ed98ddd EJ |
98 | |
99 | /* We allocate a 1-page buffer, make sure it all fits */ | |
100 | BUILD_BUG_ON((OCC_CMD_DATA_BYTES + 3) > PAGE_SIZE); | |
101 | BUILD_BUG_ON((OCC_RESP_DATA_BYTES + 7) > PAGE_SIZE); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | static ssize_t occ_read(struct file *file, char __user *buf, size_t len, | |
107 | loff_t *offset) | |
108 | { | |
109 | struct occ_client *client = file->private_data; | |
110 | ssize_t rc = 0; | |
111 | ||
112 | if (!client) | |
113 | return -ENODEV; | |
114 | ||
115 | if (len > OCC_SRAM_BYTES) | |
116 | return -EINVAL; | |
117 | ||
118 | mutex_lock(&client->lock); | |
119 | ||
120 | /* This should not be possible ... */ | |
121 | if (WARN_ON_ONCE(client->read_offset > client->data_size)) { | |
122 | rc = -EIO; | |
123 | goto done; | |
124 | } | |
125 | ||
126 | /* Grab how much data we have to read */ | |
127 | rc = min(len, client->data_size - client->read_offset); | |
128 | if (copy_to_user(buf, client->buffer + client->read_offset, rc)) | |
129 | rc = -EFAULT; | |
130 | else | |
131 | client->read_offset += rc; | |
132 | ||
133 | done: | |
134 | mutex_unlock(&client->lock); | |
135 | ||
136 | return rc; | |
137 | } | |
138 | ||
139 | static ssize_t occ_write(struct file *file, const char __user *buf, | |
140 | size_t len, loff_t *offset) | |
141 | { | |
142 | struct occ_client *client = file->private_data; | |
143 | size_t rlen, data_length; | |
62f79f3d | 144 | ssize_t rc; |
7ed98ddd EJ |
145 | u8 *cmd; |
146 | ||
147 | if (!client) | |
148 | return -ENODEV; | |
149 | ||
150 | if (len > (OCC_CMD_DATA_BYTES + 3) || len < 3) | |
151 | return -EINVAL; | |
152 | ||
153 | mutex_lock(&client->lock); | |
154 | ||
155 | /* Construct the command */ | |
156 | cmd = client->buffer; | |
157 | ||
7ed98ddd EJ |
158 | /* |
159 | * Copy the user command (assume user data follows the occ command | |
160 | * format) | |
161 | * byte 0: command type | |
162 | * bytes 1-2: data length (msb first) | |
163 | * bytes 3-n: data | |
164 | */ | |
165 | if (copy_from_user(&cmd[1], buf, len)) { | |
166 | rc = -EFAULT; | |
167 | goto done; | |
168 | } | |
169 | ||
170 | /* Extract data length */ | |
171 | data_length = (cmd[2] << 8) + cmd[3]; | |
172 | if (data_length > OCC_CMD_DATA_BYTES) { | |
173 | rc = -EINVAL; | |
174 | goto done; | |
175 | } | |
176 | ||
62f79f3d | 177 | /* Submit command; 4 bytes before the data and 2 bytes after */ |
7ed98ddd EJ |
178 | rlen = PAGE_SIZE; |
179 | rc = fsi_occ_submit(client->occ->dev, cmd, data_length + 6, cmd, | |
180 | &rlen); | |
181 | if (rc) | |
182 | goto done; | |
183 | ||
184 | /* Set read tracking data */ | |
185 | client->data_size = rlen; | |
186 | client->read_offset = 0; | |
187 | ||
188 | /* Done */ | |
189 | rc = len; | |
190 | ||
191 | done: | |
192 | mutex_unlock(&client->lock); | |
193 | ||
194 | return rc; | |
195 | } | |
196 | ||
197 | static int occ_release(struct inode *inode, struct file *file) | |
198 | { | |
199 | struct occ_client *client = file->private_data; | |
200 | ||
d3e1e246 | 201 | put_device(client->occ->dev); |
7ed98ddd EJ |
202 | free_page((unsigned long)client->buffer); |
203 | kfree(client); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static const struct file_operations occ_fops = { | |
209 | .owner = THIS_MODULE, | |
210 | .open = occ_open, | |
211 | .read = occ_read, | |
212 | .write = occ_write, | |
213 | .release = occ_release, | |
214 | }; | |
215 | ||
8ec3cc9f EJ |
216 | static void occ_save_ffdc(struct occ *occ, __be32 *resp, size_t parsed_len, |
217 | size_t resp_len) | |
218 | { | |
219 | if (resp_len > parsed_len) { | |
220 | size_t dh = resp_len - parsed_len; | |
221 | size_t ffdc_len = (dh - 1) * 4; /* SBE words are four bytes */ | |
222 | __be32 *ffdc = &resp[parsed_len]; | |
223 | ||
224 | if (ffdc_len > occ->client_buffer_size) | |
225 | ffdc_len = occ->client_buffer_size; | |
226 | ||
227 | memcpy(occ->client_buffer, ffdc, ffdc_len); | |
228 | occ->client_response_size = ffdc_len; | |
229 | } | |
230 | } | |
231 | ||
614f0a50 EJ |
232 | static int occ_verify_checksum(struct occ *occ, struct occ_response *resp, |
233 | u16 data_length) | |
7ed98ddd EJ |
234 | { |
235 | /* Fetch the two bytes after the data for the checksum. */ | |
236 | u16 checksum_resp = get_unaligned_be16(&resp->data[data_length]); | |
237 | u16 checksum; | |
238 | u16 i; | |
239 | ||
240 | checksum = resp->seq_no; | |
241 | checksum += resp->cmd_type; | |
242 | checksum += resp->return_status; | |
243 | checksum += (data_length >> 8) + (data_length & 0xFF); | |
244 | ||
245 | for (i = 0; i < data_length; ++i) | |
246 | checksum += resp->data[i]; | |
247 | ||
614f0a50 EJ |
248 | if (checksum != checksum_resp) { |
249 | dev_err(occ->dev, "Bad checksum: %04x!=%04x\n", checksum, | |
250 | checksum_resp); | |
7326939f | 251 | return -EBADE; |
614f0a50 | 252 | } |
7ed98ddd EJ |
253 | |
254 | return 0; | |
255 | } | |
256 | ||
5ec96d74 | 257 | static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) |
7ed98ddd EJ |
258 | { |
259 | u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ | |
8ec3cc9f | 260 | size_t cmd_len, parsed_len, resp_data_len; |
008d3825 EJ |
261 | size_t resp_len = OCC_MAX_RESP_WORDS; |
262 | __be32 *resp = occ->buffer; | |
263 | __be32 cmd[6]; | |
5ec96d74 | 264 | int idx = 0, rc; |
7ed98ddd EJ |
265 | |
266 | /* | |
267 | * Magic sequence to do SBE getsram command. SBE will fetch data from | |
268 | * specified SRAM address. | |
269 | */ | |
5ec96d74 EJ |
270 | switch (occ->version) { |
271 | default: | |
272 | case occ_p9: | |
273 | cmd_len = 5; | |
274 | cmd[2] = cpu_to_be32(1); /* Normal mode */ | |
275 | cmd[3] = cpu_to_be32(OCC_P9_SRAM_RSP_ADDR + offset); | |
276 | break; | |
277 | case occ_p10: | |
278 | idx = 1; | |
279 | cmd_len = 6; | |
280 | cmd[2] = cpu_to_be32(OCC_P10_SRAM_MODE); | |
281 | cmd[3] = 0; | |
282 | cmd[4] = cpu_to_be32(OCC_P10_SRAM_RSP_ADDR + offset); | |
283 | break; | |
284 | } | |
285 | ||
286 | cmd[0] = cpu_to_be32(cmd_len); | |
7ed98ddd | 287 | cmd[1] = cpu_to_be32(SBEFIFO_CMD_GET_OCC_SRAM); |
5ec96d74 | 288 | cmd[4 + idx] = cpu_to_be32(data_len); |
7ed98ddd | 289 | |
5ec96d74 | 290 | rc = sbefifo_submit(occ->sbefifo, cmd, cmd_len, resp, &resp_len); |
7ed98ddd | 291 | if (rc) |
008d3825 | 292 | return rc; |
7ed98ddd EJ |
293 | |
294 | rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_GET_OCC_SRAM, | |
8ec3cc9f | 295 | resp, resp_len, &parsed_len); |
008d3825 EJ |
296 | if (rc > 0) { |
297 | dev_err(occ->dev, "SRAM read returned failure status: %08x\n", | |
298 | rc); | |
8ec3cc9f EJ |
299 | occ_save_ffdc(occ, resp, parsed_len, resp_len); |
300 | return -ECOMM; | |
008d3825 EJ |
301 | } else if (rc) { |
302 | return rc; | |
303 | } | |
7ed98ddd | 304 | |
8ec3cc9f | 305 | resp_data_len = be32_to_cpu(resp[parsed_len - 1]); |
7ed98ddd EJ |
306 | if (resp_data_len != data_len) { |
307 | dev_err(occ->dev, "SRAM read expected %d bytes got %zd\n", | |
308 | data_len, resp_data_len); | |
309 | rc = -EBADMSG; | |
310 | } else { | |
311 | memcpy(data, resp, len); | |
312 | } | |
313 | ||
7ed98ddd EJ |
314 | return rc; |
315 | } | |
316 | ||
62f79f3d EJ |
317 | static int occ_putsram(struct occ *occ, const void *data, ssize_t len, |
318 | u8 seq_no, u16 checksum) | |
7ed98ddd | 319 | { |
7ed98ddd | 320 | u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ |
8ec3cc9f | 321 | size_t cmd_len, parsed_len, resp_data_len; |
008d3825 EJ |
322 | size_t resp_len = OCC_MAX_RESP_WORDS; |
323 | __be32 *buf = occ->buffer; | |
62f79f3d | 324 | u8 *byte_buf; |
5ec96d74 EJ |
325 | int idx = 0, rc; |
326 | ||
327 | cmd_len = (occ->version == occ_p10) ? 6 : 5; | |
5ec96d74 | 328 | cmd_len += data_len >> 2; |
7ed98ddd EJ |
329 | |
330 | /* | |
331 | * Magic sequence to do SBE putsram command. SBE will transfer | |
332 | * data to specified SRAM address. | |
333 | */ | |
334 | buf[0] = cpu_to_be32(cmd_len); | |
335 | buf[1] = cpu_to_be32(SBEFIFO_CMD_PUT_OCC_SRAM); | |
7ed98ddd | 336 | |
5ec96d74 EJ |
337 | switch (occ->version) { |
338 | default: | |
339 | case occ_p9: | |
340 | buf[2] = cpu_to_be32(1); /* Normal mode */ | |
341 | buf[3] = cpu_to_be32(OCC_P9_SRAM_CMD_ADDR); | |
342 | break; | |
343 | case occ_p10: | |
344 | idx = 1; | |
345 | buf[2] = cpu_to_be32(OCC_P10_SRAM_MODE); | |
346 | buf[3] = 0; | |
347 | buf[4] = cpu_to_be32(OCC_P10_SRAM_CMD_ADDR); | |
348 | break; | |
349 | } | |
350 | ||
351 | buf[4 + idx] = cpu_to_be32(data_len); | |
352 | memcpy(&buf[5 + idx], data, len); | |
7ed98ddd | 353 | |
62f79f3d EJ |
354 | byte_buf = (u8 *)&buf[5 + idx]; |
355 | /* | |
356 | * Overwrite the first byte with our sequence number and the last two | |
357 | * bytes with the checksum. | |
358 | */ | |
359 | byte_buf[0] = seq_no; | |
360 | byte_buf[len - 2] = checksum >> 8; | |
361 | byte_buf[len - 1] = checksum & 0xff; | |
362 | ||
7ed98ddd EJ |
363 | rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); |
364 | if (rc) | |
008d3825 | 365 | return rc; |
7ed98ddd EJ |
366 | |
367 | rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, | |
8ec3cc9f | 368 | buf, resp_len, &parsed_len); |
008d3825 EJ |
369 | if (rc > 0) { |
370 | dev_err(occ->dev, "SRAM write returned failure status: %08x\n", | |
371 | rc); | |
8ec3cc9f EJ |
372 | occ_save_ffdc(occ, buf, parsed_len, resp_len); |
373 | return -ECOMM; | |
008d3825 EJ |
374 | } else if (rc) { |
375 | return rc; | |
376 | } | |
7ed98ddd | 377 | |
8ec3cc9f | 378 | if (parsed_len != 1) { |
7ed98ddd | 379 | dev_err(occ->dev, "SRAM write response length invalid: %zd\n", |
8ec3cc9f | 380 | parsed_len); |
7ed98ddd EJ |
381 | rc = -EBADMSG; |
382 | } else { | |
383 | resp_data_len = be32_to_cpu(buf[0]); | |
384 | if (resp_data_len != data_len) { | |
385 | dev_err(occ->dev, | |
386 | "SRAM write expected %d bytes got %zd\n", | |
387 | data_len, resp_data_len); | |
388 | rc = -EBADMSG; | |
389 | } | |
390 | } | |
391 | ||
7ed98ddd EJ |
392 | return rc; |
393 | } | |
394 | ||
395 | static int occ_trigger_attn(struct occ *occ) | |
396 | { | |
008d3825 | 397 | __be32 *buf = occ->buffer; |
8ec3cc9f | 398 | size_t cmd_len, parsed_len, resp_data_len; |
008d3825 | 399 | size_t resp_len = OCC_MAX_RESP_WORDS; |
5ec96d74 | 400 | int idx = 0, rc; |
7ed98ddd | 401 | |
5ec96d74 EJ |
402 | switch (occ->version) { |
403 | default: | |
404 | case occ_p9: | |
405 | cmd_len = 7; | |
406 | buf[2] = cpu_to_be32(3); /* Circular mode */ | |
407 | buf[3] = 0; | |
408 | break; | |
409 | case occ_p10: | |
410 | idx = 1; | |
411 | cmd_len = 8; | |
412 | buf[2] = cpu_to_be32(0xd0); /* Circular mode, OCB Channel 1 */ | |
413 | buf[3] = 0; | |
414 | buf[4] = 0; | |
415 | break; | |
416 | } | |
417 | ||
418 | buf[0] = cpu_to_be32(cmd_len); /* Chip-op length in words */ | |
7ed98ddd | 419 | buf[1] = cpu_to_be32(SBEFIFO_CMD_PUT_OCC_SRAM); |
5ec96d74 EJ |
420 | buf[4 + idx] = cpu_to_be32(8); /* Data length in bytes */ |
421 | buf[5 + idx] = cpu_to_be32(0x20010000); /* Trigger OCC attention */ | |
422 | buf[6 + idx] = 0; | |
7ed98ddd | 423 | |
5ec96d74 | 424 | rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); |
7ed98ddd | 425 | if (rc) |
008d3825 | 426 | return rc; |
7ed98ddd EJ |
427 | |
428 | rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, | |
8ec3cc9f | 429 | buf, resp_len, &parsed_len); |
008d3825 EJ |
430 | if (rc > 0) { |
431 | dev_err(occ->dev, "SRAM attn returned failure status: %08x\n", | |
432 | rc); | |
8ec3cc9f EJ |
433 | occ_save_ffdc(occ, buf, parsed_len, resp_len); |
434 | return -ECOMM; | |
008d3825 EJ |
435 | } else if (rc) { |
436 | return rc; | |
437 | } | |
7ed98ddd | 438 | |
8ec3cc9f | 439 | if (parsed_len != 1) { |
7ed98ddd | 440 | dev_err(occ->dev, "SRAM attn response length invalid: %zd\n", |
8ec3cc9f | 441 | parsed_len); |
7ed98ddd EJ |
442 | rc = -EBADMSG; |
443 | } else { | |
444 | resp_data_len = be32_to_cpu(buf[0]); | |
445 | if (resp_data_len != 8) { | |
446 | dev_err(occ->dev, | |
447 | "SRAM attn expected 8 bytes got %zd\n", | |
448 | resp_data_len); | |
449 | rc = -EBADMSG; | |
450 | } | |
451 | } | |
452 | ||
7ed98ddd EJ |
453 | return rc; |
454 | } | |
455 | ||
3dcf3c84 EJ |
456 | static bool fsi_occ_response_not_ready(struct occ_response *resp, u8 seq_no, |
457 | u8 cmd_type) | |
458 | { | |
459 | return resp->return_status == OCC_RESP_CMD_IN_PRG || | |
460 | resp->return_status == OCC_RESP_CRIT_INIT || | |
461 | resp->seq_no != seq_no || resp->cmd_type != cmd_type; | |
462 | } | |
463 | ||
7ed98ddd EJ |
464 | int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, |
465 | void *response, size_t *resp_len) | |
466 | { | |
467 | const unsigned long timeout = msecs_to_jiffies(OCC_TIMEOUT_MS); | |
468 | const unsigned long wait_time = | |
469 | msecs_to_jiffies(OCC_CMD_IN_PRG_WAIT_MS); | |
470 | struct occ *occ = dev_get_drvdata(dev); | |
471 | struct occ_response *resp = response; | |
8ec3cc9f | 472 | size_t user_resp_len = *resp_len; |
afd26118 | 473 | u8 seq_no; |
3dcf3c84 | 474 | u8 cmd_type; |
62f79f3d | 475 | u16 checksum = 0; |
7ed98ddd | 476 | u16 resp_data_length; |
62f79f3d | 477 | const u8 *byte_request = (const u8 *)request; |
3dcf3c84 | 478 | unsigned long end; |
7ed98ddd | 479 | int rc; |
62f79f3d | 480 | size_t i; |
7ed98ddd | 481 | |
8ec3cc9f EJ |
482 | *resp_len = 0; |
483 | ||
7ed98ddd EJ |
484 | if (!occ) |
485 | return -ENODEV; | |
486 | ||
8ec3cc9f EJ |
487 | if (user_resp_len < 7) { |
488 | dev_dbg(dev, "Bad resplen %zd\n", user_resp_len); | |
7ed98ddd EJ |
489 | return -EINVAL; |
490 | } | |
491 | ||
3dcf3c84 EJ |
492 | cmd_type = byte_request[1]; |
493 | ||
62f79f3d EJ |
494 | /* Checksum the request, ignoring first byte (sequence number). */ |
495 | for (i = 1; i < req_len - 2; ++i) | |
496 | checksum += byte_request[i]; | |
497 | ||
d3e1e246 EJ |
498 | rc = mutex_lock_interruptible(&occ->occ_lock); |
499 | if (rc) | |
500 | return rc; | |
7ed98ddd | 501 | |
8ec3cc9f EJ |
502 | occ->client_buffer = response; |
503 | occ->client_buffer_size = user_resp_len; | |
504 | occ->client_response_size = 0; | |
505 | ||
d3e1e246 EJ |
506 | if (!occ->buffer) { |
507 | rc = -ENOENT; | |
508 | goto done; | |
509 | } | |
510 | ||
62f79f3d EJ |
511 | /* |
512 | * Get a sequence number and update the counter. Avoid a sequence | |
513 | * number of 0 which would pass the response check below even if the | |
514 | * OCC response is uninitialized. Any sequence number the user is | |
515 | * trying to send is overwritten since this function is the only common | |
516 | * interface to the OCC and therefore the only place we can guarantee | |
517 | * unique sequence numbers. | |
518 | */ | |
519 | seq_no = occ->sequence_number++; | |
520 | if (!occ->sequence_number) | |
521 | occ->sequence_number = 1; | |
522 | checksum += seq_no; | |
523 | ||
524 | rc = occ_putsram(occ, request, req_len, seq_no, checksum); | |
7ed98ddd EJ |
525 | if (rc) |
526 | goto done; | |
527 | ||
528 | rc = occ_trigger_attn(occ); | |
529 | if (rc) | |
530 | goto done; | |
531 | ||
3dcf3c84 EJ |
532 | end = jiffies + timeout; |
533 | while (true) { | |
534 | /* Read occ response header */ | |
5ec96d74 | 535 | rc = occ_getsram(occ, 0, resp, 8); |
7ed98ddd EJ |
536 | if (rc) |
537 | goto done; | |
538 | ||
3dcf3c84 EJ |
539 | if (fsi_occ_response_not_ready(resp, seq_no, cmd_type)) { |
540 | if (time_after(jiffies, end)) { | |
541 | dev_err(occ->dev, | |
542 | "resp timeout status=%02x seq=%d cmd=%d, our seq=%d cmd=%d\n", | |
afd26118 | 543 | resp->return_status, resp->seq_no, |
3dcf3c84 EJ |
544 | resp->cmd_type, seq_no, cmd_type); |
545 | rc = -ETIMEDOUT; | |
afd26118 EJ |
546 | goto done; |
547 | } | |
7ed98ddd EJ |
548 | |
549 | set_current_state(TASK_UNINTERRUPTIBLE); | |
550 | schedule_timeout(wait_time); | |
3dcf3c84 EJ |
551 | } else { |
552 | /* Extract size of response data */ | |
553 | resp_data_length = | |
554 | get_unaligned_be16(&resp->data_length); | |
555 | ||
556 | /* | |
557 | * Message size is data length + 5 bytes header + 2 | |
558 | * bytes checksum | |
559 | */ | |
560 | if ((resp_data_length + 7) > user_resp_len) { | |
561 | rc = -EMSGSIZE; | |
562 | goto done; | |
563 | } | |
7ed98ddd | 564 | |
3dcf3c84 EJ |
565 | /* |
566 | * Get the entire response including the header again, | |
567 | * in case it changed | |
568 | */ | |
569 | if (resp_data_length > 1) { | |
570 | rc = occ_getsram(occ, 0, resp, | |
571 | resp_data_length + 7); | |
572 | if (rc) | |
573 | goto done; | |
574 | ||
575 | if (!fsi_occ_response_not_ready(resp, seq_no, | |
576 | cmd_type)) | |
577 | break; | |
578 | } else { | |
579 | break; | |
580 | } | |
581 | } | |
7ed98ddd EJ |
582 | } |
583 | ||
584 | dev_dbg(dev, "resp_status=%02x resp_data_len=%d\n", | |
585 | resp->return_status, resp_data_length); | |
586 | ||
614f0a50 | 587 | rc = occ_verify_checksum(occ, resp, resp_data_length); |
7326939f EJ |
588 | if (rc) |
589 | goto done; | |
590 | ||
591 | occ->client_response_size = resp_data_length + 7; | |
7ed98ddd EJ |
592 | |
593 | done: | |
8ec3cc9f | 594 | *resp_len = occ->client_response_size; |
7ed98ddd EJ |
595 | mutex_unlock(&occ->occ_lock); |
596 | ||
597 | return rc; | |
598 | } | |
599 | EXPORT_SYMBOL_GPL(fsi_occ_submit); | |
600 | ||
601 | static int occ_unregister_child(struct device *dev, void *data) | |
602 | { | |
603 | struct platform_device *hwmon_dev = to_platform_device(dev); | |
604 | ||
605 | platform_device_unregister(hwmon_dev); | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | static int occ_probe(struct platform_device *pdev) | |
611 | { | |
612 | int rc; | |
613 | u32 reg; | |
614 | struct occ *occ; | |
615 | struct platform_device *hwmon_dev; | |
616 | struct device *dev = &pdev->dev; | |
617 | struct platform_device_info hwmon_dev_info = { | |
618 | .parent = dev, | |
619 | .name = "occ-hwmon", | |
620 | }; | |
621 | ||
622 | occ = devm_kzalloc(dev, sizeof(*occ), GFP_KERNEL); | |
623 | if (!occ) | |
624 | return -ENOMEM; | |
625 | ||
008d3825 EJ |
626 | /* SBE words are always four bytes */ |
627 | occ->buffer = kvmalloc(OCC_MAX_RESP_WORDS * 4, GFP_KERNEL); | |
628 | if (!occ->buffer) | |
629 | return -ENOMEM; | |
630 | ||
5ec96d74 | 631 | occ->version = (uintptr_t)of_device_get_match_data(dev); |
7ed98ddd EJ |
632 | occ->dev = dev; |
633 | occ->sbefifo = dev->parent; | |
3dcf3c84 EJ |
634 | /* |
635 | * Quickly derive a pseudo-random number from jiffies so that | |
636 | * re-probing the driver doesn't accidentally overlap sequence numbers. | |
637 | */ | |
638 | occ->sequence_number = (u8)((jiffies % 0xff) + 1); | |
7ed98ddd EJ |
639 | mutex_init(&occ->occ_lock); |
640 | ||
641 | if (dev->of_node) { | |
642 | rc = of_property_read_u32(dev->of_node, "reg", ®); | |
643 | if (!rc) { | |
644 | /* make sure we don't have a duplicate from dts */ | |
645 | occ->idx = ida_simple_get(&occ_ida, reg, reg + 1, | |
646 | GFP_KERNEL); | |
647 | if (occ->idx < 0) | |
648 | occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, | |
649 | GFP_KERNEL); | |
650 | } else { | |
651 | occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, | |
652 | GFP_KERNEL); | |
653 | } | |
654 | } else { | |
655 | occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, GFP_KERNEL); | |
656 | } | |
657 | ||
658 | platform_set_drvdata(pdev, occ); | |
659 | ||
660 | snprintf(occ->name, sizeof(occ->name), "occ%d", occ->idx); | |
661 | occ->mdev.fops = &occ_fops; | |
662 | occ->mdev.minor = MISC_DYNAMIC_MINOR; | |
663 | occ->mdev.name = occ->name; | |
664 | occ->mdev.parent = dev; | |
665 | ||
666 | rc = misc_register(&occ->mdev); | |
667 | if (rc) { | |
668 | dev_err(dev, "failed to register miscdevice: %d\n", rc); | |
669 | ida_simple_remove(&occ_ida, occ->idx); | |
008d3825 | 670 | kvfree(occ->buffer); |
7ed98ddd EJ |
671 | return rc; |
672 | } | |
673 | ||
674 | hwmon_dev_info.id = occ->idx; | |
675 | hwmon_dev = platform_device_register_full(&hwmon_dev_info); | |
3c3c4848 | 676 | if (IS_ERR(hwmon_dev)) |
7ed98ddd EJ |
677 | dev_warn(dev, "failed to create hwmon device\n"); |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
682 | static int occ_remove(struct platform_device *pdev) | |
683 | { | |
684 | struct occ *occ = platform_get_drvdata(pdev); | |
685 | ||
686 | misc_deregister(&occ->mdev); | |
687 | ||
d3e1e246 EJ |
688 | mutex_lock(&occ->occ_lock); |
689 | kvfree(occ->buffer); | |
690 | occ->buffer = NULL; | |
691 | mutex_unlock(&occ->occ_lock); | |
692 | ||
7ed98ddd EJ |
693 | device_for_each_child(&pdev->dev, NULL, occ_unregister_child); |
694 | ||
695 | ida_simple_remove(&occ_ida, occ->idx); | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | static const struct of_device_id occ_match[] = { | |
5ec96d74 EJ |
701 | { |
702 | .compatible = "ibm,p9-occ", | |
703 | .data = (void *)occ_p9 | |
704 | }, | |
705 | { | |
706 | .compatible = "ibm,p10-occ", | |
707 | .data = (void *)occ_p10 | |
708 | }, | |
7ed98ddd EJ |
709 | { }, |
710 | }; | |
19a52178 | 711 | MODULE_DEVICE_TABLE(of, occ_match); |
7ed98ddd EJ |
712 | |
713 | static struct platform_driver occ_driver = { | |
714 | .driver = { | |
715 | .name = "occ", | |
716 | .of_match_table = occ_match, | |
717 | }, | |
718 | .probe = occ_probe, | |
719 | .remove = occ_remove, | |
720 | }; | |
721 | ||
722 | static int occ_init(void) | |
723 | { | |
724 | return platform_driver_register(&occ_driver); | |
725 | } | |
726 | ||
727 | static void occ_exit(void) | |
728 | { | |
729 | platform_driver_unregister(&occ_driver); | |
730 | ||
731 | ida_destroy(&occ_ida); | |
732 | } | |
733 | ||
734 | module_init(occ_init); | |
735 | module_exit(occ_exit); | |
736 | ||
737 | MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>"); | |
738 | MODULE_DESCRIPTION("BMC P9 OCC driver"); | |
739 | MODULE_LICENSE("GPL"); |