1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2016 T-Platforms. All Rights Reserved.
4 *
5 * IDT PCIe-switch NTB Linux driver
6 *
7 * Contact Information:
8 * Serge Semin <fancer.lancer@gmail.com>, <Sergey.Semin@t-platforms.ru>
9 */
10 /*
11 * NOTE of the IDT 89HPESx SMBus-slave interface driver
12 * This driver primarily is developed to have an access to EEPROM device of
13 * IDT PCIe-switches. IDT provides a simple SMBus interface to perform IO-
14 * operations from/to EEPROM, which is located at private (so called Master)
15 * SMBus of switches. Using that interface this the driver creates a simple
16 * binary sysfs-file in the device directory:
17 * /sys/bus/i2c/devices/<bus>-<devaddr>/eeprom
18 * In case if read-only flag is specified in the dts-node of device desription,
19 * User-space applications won't be able to write to the EEPROM sysfs-node.
20 * Additionally IDT 89HPESx SMBus interface has an ability to write/read
21 * data of device CSRs. This driver exposes debugf-file to perform simple IO
22 * operations using that ability for just basic debug purpose. Particularly
23 * next file is created in the specific debugfs-directory:
24 * /sys/kernel/debug/idt_csr/
25 * Format of the debugfs-node is:
26 * $ cat /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>;
27 * <CSR address>:<CSR value>
28 * So reading the content of the file gives current CSR address and it value.
29 * If User-space application wishes to change current CSR address,
30 * it can just write a proper value to the sysfs-file:
31 * $ echo "<CSR address>" > /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>
32 * If it wants to change the CSR value as well, the format of the write
33 * operation is:
34 * $ echo "<CSR address>:<CSR value>" > \
35 * /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>;
36 * CSR address and value can be any of hexadecimal, decimal or octal format.
37 */
38
39 #include <linux/kernel.h>
40 #include <linux/init.h>
41 #include <linux/module.h>
42 #include <linux/types.h>
43 #include <linux/sizes.h>
44 #include <linux/slab.h>
45 #include <linux/mutex.h>
46 #include <linux/sysfs.h>
47 #include <linux/debugfs.h>
48 #include <linux/mod_devicetable.h>
49 #include <linux/property.h>
50 #include <linux/i2c.h>
51 #include <linux/pci_ids.h>
52 #include <linux/delay.h>
53
54 #define IDT_NAME "89hpesx"
55 #define IDT_89HPESX_DESC "IDT 89HPESx SMBus-slave interface driver"
56 #define IDT_89HPESX_VER "1.0"
57
58 MODULE_DESCRIPTION(IDT_89HPESX_DESC);
59 MODULE_VERSION(IDT_89HPESX_VER);
60 MODULE_LICENSE("GPL v2");
61 MODULE_AUTHOR("T-platforms");
62
63 /*
64 * csr_dbgdir - CSR read/write operations Debugfs directory
65 */
66 static struct dentry *csr_dbgdir;
67
68 /*
69 * struct idt_89hpesx_dev - IDT 89HPESx device data structure
70 * @eesize: Size of EEPROM in bytes (calculated from "idt,eecompatible")
71 * @eero: EEPROM Read-only flag
72 * @eeaddr: EEPROM custom address
73 *
74 * @inieecmd: Initial cmd value for EEPROM read/write operations
75 * @inicsrcmd: Initial cmd value for CSR read/write operations
76 * @iniccode: Initialial command code value for IO-operations
77 *
78 * @csr: CSR address to perform read operation
79 *
80 * @smb_write: SMBus write method
81 * @smb_read: SMBus read method
82 * @smb_mtx: SMBus mutex
83 *
84 * @client: i2c client used to perform IO operations
85 *
86 * @ee_file: EEPROM read/write sysfs-file
87 */
88 struct idt_smb_seq;
89 struct idt_89hpesx_dev {
90 u32 eesize;
91 bool eero;
92 u8 eeaddr;
93
94 u8 inieecmd;
95 u8 inicsrcmd;
96 u8 iniccode;
97
98 u16 csr;
99
100 int (*smb_write)(struct idt_89hpesx_dev *, const struct idt_smb_seq *);
101 int (*smb_read)(struct idt_89hpesx_dev *, struct idt_smb_seq *);
102 struct mutex smb_mtx;
103
104 struct i2c_client *client;
105
106 struct bin_attribute *ee_file;
107 struct dentry *csr_dir;
108 };
109
110 /*
111 * struct idt_smb_seq - sequence of data to be read/written from/to IDT 89HPESx
112 * @ccode: SMBus command code
113 * @bytecnt: Byte count of operation
114 * @data: Data to by written
115 */
116 struct idt_smb_seq {
117 u8 ccode;
118 u8 bytecnt;
119 u8 *data;
120 };
121
122 /*
123 * struct idt_eeprom_seq - sequence of data to be read/written from/to EEPROM
124 * @cmd: Transaction CMD
125 * @eeaddr: EEPROM custom address
126 * @memaddr: Internal memory address of EEPROM
127 * @data: Data to be written at the memory address
128 */
129 struct idt_eeprom_seq {
130 u8 cmd;
131 u8 eeaddr;
132 u16 memaddr;
133 u8 data;
134 } __packed;
135
136 /*
137 * struct idt_csr_seq - sequence of data to be read/written from/to CSR
138 * @cmd: Transaction CMD
139 * @csraddr: Internal IDT device CSR address
140 * @data: Data to be read/written from/to the CSR address
141 */
142 struct idt_csr_seq {
143 u8 cmd;
144 u16 csraddr;
145 u32 data;
146 } __packed;
147
148 /*
149 * SMBus command code macros
150 * @CCODE_END: Indicates the end of transaction
151 * @CCODE_START: Indicates the start of transaction
152 * @CCODE_CSR: CSR read/write transaction
153 * @CCODE_EEPROM: EEPROM read/write transaction
154 * @CCODE_BYTE: Supplied data has BYTE length
155 * @CCODE_WORD: Supplied data has WORD length
156 * @CCODE_BLOCK: Supplied data has variable length passed in bytecnt
157 * byte right following CCODE byte
158 */
159 #define CCODE_END ((u8)0x01)
160 #define CCODE_START ((u8)0x02)
161 #define CCODE_CSR ((u8)0x00)
162 #define CCODE_EEPROM ((u8)0x04)
163 #define CCODE_BYTE ((u8)0x00)
164 #define CCODE_WORD ((u8)0x20)
165 #define CCODE_BLOCK ((u8)0x40)
166 #define CCODE_PEC ((u8)0x80)
167
168 /*
169 * EEPROM command macros
170 * @EEPROM_OP_WRITE: EEPROM write operation
171 * @EEPROM_OP_READ: EEPROM read operation
172 * @EEPROM_USA: Use specified address of EEPROM
173 * @EEPROM_NAERR: EEPROM device is not ready to respond
174 * @EEPROM_LAERR: EEPROM arbitration loss error
175 * @EEPROM_MSS: EEPROM misplace start & stop bits error
176 * @EEPROM_WR_CNT: Bytes count to perform write operation
177 * @EEPROM_WRRD_CNT: Bytes count to write before reading
178 * @EEPROM_RD_CNT: Bytes count to perform read operation
179 * @EEPROM_DEF_SIZE: Fall back size of EEPROM
180 * @EEPROM_DEF_ADDR: Defatul EEPROM address
181 * @EEPROM_TOUT: Timeout before retry read operation if eeprom is busy
182 */
183 #define EEPROM_OP_WRITE ((u8)0x00)
184 #define EEPROM_OP_READ ((u8)0x01)
185 #define EEPROM_USA ((u8)0x02)
186 #define EEPROM_NAERR ((u8)0x08)
187 #define EEPROM_LAERR ((u8)0x10)
188 #define EEPROM_MSS ((u8)0x20)
189 #define EEPROM_WR_CNT ((u8)5)
190 #define EEPROM_WRRD_CNT ((u8)4)
191 #define EEPROM_RD_CNT ((u8)5)
192 #define EEPROM_DEF_SIZE ((u16)4096)
193 #define EEPROM_DEF_ADDR ((u8)0x50)
194 #define EEPROM_TOUT (100)
195
196 /*
197 * CSR command macros
198 * @CSR_DWE: Enable all four bytes of the operation
199 * @CSR_OP_WRITE: CSR write operation
200 * @CSR_OP_READ: CSR read operation
201 * @CSR_RERR: Read operation error
202 * @CSR_WERR: Write operation error
203 * @CSR_WR_CNT: Bytes count to perform write operation
204 * @CSR_WRRD_CNT: Bytes count to write before reading
205 * @CSR_RD_CNT: Bytes count to perform read operation
206 * @CSR_MAX: Maximum CSR address
207 * @CSR_DEF: Default CSR address
208 * @CSR_REAL_ADDR: CSR real unshifted address
209 */
210 #define CSR_DWE ((u8)0x0F)
211 #define CSR_OP_WRITE ((u8)0x00)
212 #define CSR_OP_READ ((u8)0x10)
213 #define CSR_RERR ((u8)0x40)
214 #define CSR_WERR ((u8)0x80)
215 #define CSR_WR_CNT ((u8)7)
216 #define CSR_WRRD_CNT ((u8)3)
217 #define CSR_RD_CNT ((u8)7)
218 #define CSR_MAX ((u32)0x3FFFF)
219 #define CSR_DEF ((u16)0x0000)
220 #define CSR_REAL_ADDR(val) ((unsigned int)val << 2)
221
222 /*
223 * IDT 89HPESx basic register
224 * @IDT_VIDDID_CSR: PCIe VID and DID of IDT 89HPESx
225 * @IDT_VID_MASK: Mask of VID
226 */
227 #define IDT_VIDDID_CSR ((u32)0x0000)
228 #define IDT_VID_MASK ((u32)0xFFFF)
229
230 /*
231 * IDT 89HPESx can send NACK when new command is sent before previous one
232 * fininshed execution. In this case driver retries operation
233 * certain times.
234 * @RETRY_CNT: Number of retries before giving up and fail
235 * @idt_smb_safe: Generate a retry loop on corresponding SMBus method
236 */
237 #define RETRY_CNT (128)
238 #define idt_smb_safe(ops, args...) ({ \
239 int __retry = RETRY_CNT; \
240 s32 __sts; \
241 do { \
242 __sts = i2c_smbus_ ## ops ## _data(args); \
243 } while (__retry-- && __sts < 0); \
244 __sts; \
245 })
246
247 /*===========================================================================
248 * i2c bus level IO-operations
249 *===========================================================================
250 */
251
252 /*
253 * idt_smb_write_byte() - SMBus write method when I2C_SMBUS_BYTE_DATA operation
254 * is only available
255 * @pdev: Pointer to the driver data
256 * @seq: Sequence of data to be written
257 */
idt_smb_write_byte(struct idt_89hpesx_dev * pdev,const struct idt_smb_seq * seq)258 static int idt_smb_write_byte(struct idt_89hpesx_dev *pdev,
259 const struct idt_smb_seq *seq)
260 {
261 s32 sts;
262 u8 ccode;
263 int idx;
264
265 /* Loop over the supplied data sending byte one-by-one */
266 for (idx = 0; idx < seq->bytecnt; idx++) {
267 /* Collect the command code byte */
268 ccode = seq->ccode | CCODE_BYTE;
269 if (idx == 0)
270 ccode |= CCODE_START;
271 if (idx == seq->bytecnt - 1)
272 ccode |= CCODE_END;
273
274 /* Send data to the device */
275 sts = idt_smb_safe(write_byte, pdev->client, ccode,
276 seq->data[idx]);
277 if (sts != 0)
278 return (int)sts;
279 }
280
281 return 0;
282 }
283
284 /*
285 * idt_smb_read_byte() - SMBus read method when I2C_SMBUS_BYTE_DATA operation
286 * is only available
287 * @pdev: Pointer to the driver data
288 * @seq: Buffer to read data to
289 */
idt_smb_read_byte(struct idt_89hpesx_dev * pdev,struct idt_smb_seq * seq)290 static int idt_smb_read_byte(struct idt_89hpesx_dev *pdev,
291 struct idt_smb_seq *seq)
292 {
293 s32 sts;
294 u8 ccode;
295 int idx;
296
297 /* Loop over the supplied buffer receiving byte one-by-one */
298 for (idx = 0; idx < seq->bytecnt; idx++) {
299 /* Collect the command code byte */
300 ccode = seq->ccode | CCODE_BYTE;
301 if (idx == 0)
302 ccode |= CCODE_START;
303 if (idx == seq->bytecnt - 1)
304 ccode |= CCODE_END;
305
306 /* Read data from the device */
307 sts = idt_smb_safe(read_byte, pdev->client, ccode);
308 if (sts < 0)
309 return (int)sts;
310
311 seq->data[idx] = (u8)sts;
312 }
313
314 return 0;
315 }
316
317 /*
318 * idt_smb_write_word() - SMBus write method when I2C_SMBUS_BYTE_DATA and
319 * I2C_FUNC_SMBUS_WORD_DATA operations are available
320 * @pdev: Pointer to the driver data
321 * @seq: Sequence of data to be written
322 */
idt_smb_write_word(struct idt_89hpesx_dev * pdev,const struct idt_smb_seq * seq)323 static int idt_smb_write_word(struct idt_89hpesx_dev *pdev,
324 const struct idt_smb_seq *seq)
325 {
326 s32 sts;
327 u8 ccode;
328 int idx, evencnt;
329
330 /* Calculate the even count of data to send */
331 evencnt = seq->bytecnt - (seq->bytecnt % 2);
332
333 /* Loop over the supplied data sending two bytes at a time */
334 for (idx = 0; idx < evencnt; idx += 2) {
335 /* Collect the command code byte */
336 ccode = seq->ccode | CCODE_WORD;
337 if (idx == 0)
338 ccode |= CCODE_START;
339 if (idx == evencnt - 2)
340 ccode |= CCODE_END;
341
342 /* Send word data to the device */
343 sts = idt_smb_safe(write_word, pdev->client, ccode,
344 *(u16 *)&seq->data[idx]);
345 if (sts != 0)
346 return (int)sts;
347 }
348
349 /* If there is odd number of bytes then send just one last byte */
350 if (seq->bytecnt != evencnt) {
351 /* Collect the command code byte */
352 ccode = seq->ccode | CCODE_BYTE | CCODE_END;
353 if (idx == 0)
354 ccode |= CCODE_START;
355
356 /* Send byte data to the device */
357 sts = idt_smb_safe(write_byte, pdev->client, ccode,
358 seq->data[idx]);
359 if (sts != 0)
360 return (int)sts;
361 }
362
363 return 0;
364 }
365
366 /*
367 * idt_smb_read_word() - SMBus read method when I2C_SMBUS_BYTE_DATA and
368 * I2C_FUNC_SMBUS_WORD_DATA operations are available
369 * @pdev: Pointer to the driver data
370 * @seq: Buffer to read data to
371 */
idt_smb_read_word(struct idt_89hpesx_dev * pdev,struct idt_smb_seq * seq)372 static int idt_smb_read_word(struct idt_89hpesx_dev *pdev,
373 struct idt_smb_seq *seq)
374 {
375 s32 sts;
376 u8 ccode;
377 int idx, evencnt;
378
379 /* Calculate the even count of data to send */
380 evencnt = seq->bytecnt - (seq->bytecnt % 2);
381
382 /* Loop over the supplied data reading two bytes at a time */
383 for (idx = 0; idx < evencnt; idx += 2) {
384 /* Collect the command code byte */
385 ccode = seq->ccode | CCODE_WORD;
386 if (idx == 0)
387 ccode |= CCODE_START;
388 if (idx == evencnt - 2)
389 ccode |= CCODE_END;
390
391 /* Read word data from the device */
392 sts = idt_smb_safe(read_word, pdev->client, ccode);
393 if (sts < 0)
394 return (int)sts;
395
396 *(u16 *)&seq->data[idx] = (u16)sts;
397 }
398
399 /* If there is odd number of bytes then receive just one last byte */
400 if (seq->bytecnt != evencnt) {
401 /* Collect the command code byte */
402 ccode = seq->ccode | CCODE_BYTE | CCODE_END;
403 if (idx == 0)
404 ccode |= CCODE_START;
405
406 /* Read last data byte from the device */
407 sts = idt_smb_safe(read_byte, pdev->client, ccode);
408 if (sts < 0)
409 return (int)sts;
410
411 seq->data[idx] = (u8)sts;
412 }
413
414 return 0;
415 }
416
417 /*
418 * idt_smb_write_block() - SMBus write method when I2C_SMBUS_BLOCK_DATA
419 * operation is available
420 * @pdev: Pointer to the driver data
421 * @seq: Sequence of data to be written
422 */
idt_smb_write_block(struct idt_89hpesx_dev * pdev,const struct idt_smb_seq * seq)423 static int idt_smb_write_block(struct idt_89hpesx_dev *pdev,
424 const struct idt_smb_seq *seq)
425 {
426 u8 ccode;
427
428 /* Return error if too much data passed to send */
429 if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
430 return -EINVAL;
431
432 /* Collect the command code byte */
433 ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
434
435 /* Send block of data to the device */
436 return idt_smb_safe(write_block, pdev->client, ccode, seq->bytecnt,
437 seq->data);
438 }
439
440 /*
441 * idt_smb_read_block() - SMBus read method when I2C_SMBUS_BLOCK_DATA
442 * operation is available
443 * @pdev: Pointer to the driver data
444 * @seq: Buffer to read data to
445 */
idt_smb_read_block(struct idt_89hpesx_dev * pdev,struct idt_smb_seq * seq)446 static int idt_smb_read_block(struct idt_89hpesx_dev *pdev,
447 struct idt_smb_seq *seq)
448 {
449 s32 sts;
450 u8 ccode;
451
452 /* Return error if too much data passed to send */
453 if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
454 return -EINVAL;
455
456 /* Collect the command code byte */
457 ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
458
459 /* Read block of data from the device */
460 sts = idt_smb_safe(read_block, pdev->client, ccode, seq->data);
461 if (sts != seq->bytecnt)
462 return (sts < 0 ? sts : -ENODATA);
463
464 return 0;
465 }
466
467 /*
468 * idt_smb_write_i2c_block() - SMBus write method when I2C_SMBUS_I2C_BLOCK_DATA
469 * operation is available
470 * @pdev: Pointer to the driver data
471 * @seq: Sequence of data to be written
472 *
473 * NOTE It's usual SMBus write block operation, except the actual data length is
474 * sent as first byte of data
475 */
idt_smb_write_i2c_block(struct idt_89hpesx_dev * pdev,const struct idt_smb_seq * seq)476 static int idt_smb_write_i2c_block(struct idt_89hpesx_dev *pdev,
477 const struct idt_smb_seq *seq)
478 {
479 u8 ccode, buf[I2C_SMBUS_BLOCK_MAX + 1];
480
481 /* Return error if too much data passed to send */
482 if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
483 return -EINVAL;
484
485 /* Collect the data to send. Length byte must be added prior the data */
486 buf[0] = seq->bytecnt;
487 memcpy(&buf[1], seq->data, seq->bytecnt);
488
489 /* Collect the command code byte */
490 ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
491
492 /* Send length and block of data to the device */
493 return idt_smb_safe(write_i2c_block, pdev->client, ccode,
494 seq->bytecnt + 1, buf);
495 }
496
497 /*
498 * idt_smb_read_i2c_block() - SMBus read method when I2C_SMBUS_I2C_BLOCK_DATA
499 * operation is available
500 * @pdev: Pointer to the driver data
501 * @seq: Buffer to read data to
502 *
503 * NOTE It's usual SMBus read block operation, except the actual data length is
504 * retrieved as first byte of data
505 */
idt_smb_read_i2c_block(struct idt_89hpesx_dev * pdev,struct idt_smb_seq * seq)506 static int idt_smb_read_i2c_block(struct idt_89hpesx_dev *pdev,
507 struct idt_smb_seq *seq)
508 {
509 u8 ccode, buf[I2C_SMBUS_BLOCK_MAX + 1];
510 s32 sts;
511
512 /* Return error if too much data passed to send */
513 if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
514 return -EINVAL;
515
516 /* Collect the command code byte */
517 ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
518
519 /* Read length and block of data from the device */
520 sts = idt_smb_safe(read_i2c_block, pdev->client, ccode,
521 seq->bytecnt + 1, buf);
522 if (sts != seq->bytecnt + 1)
523 return (sts < 0 ? sts : -ENODATA);
524 if (buf[0] != seq->bytecnt)
525 return -ENODATA;
526
527 /* Copy retrieved data to the output data buffer */
528 memcpy(seq->data, &buf[1], seq->bytecnt);
529
530 return 0;
531 }
532
533 /*===========================================================================
534 * EEPROM IO-operations
535 *===========================================================================
536 */
537
538 /*
539 * idt_eeprom_read_byte() - read just one byte from EEPROM
540 * @pdev: Pointer to the driver data
541 * @memaddr: Start EEPROM memory address
542 * @data: Data to be written to EEPROM
543 */
idt_eeprom_read_byte(struct idt_89hpesx_dev * pdev,u16 memaddr,u8 * data)544 static int idt_eeprom_read_byte(struct idt_89hpesx_dev *pdev, u16 memaddr,
545 u8 *data)
546 {
547 struct device *dev = &pdev->client->dev;
548 struct idt_eeprom_seq eeseq;
549 struct idt_smb_seq smbseq;
550 int ret, retry;
551
552 /* Initialize SMBus sequence fields */
553 smbseq.ccode = pdev->iniccode | CCODE_EEPROM;
554 smbseq.data = (u8 *)&eeseq;
555
556 /*
557 * Sometimes EEPROM may respond with NACK if it's busy with previous
558 * operation, so we need to perform a few attempts of read cycle
559 */
560 retry = RETRY_CNT;
561 do {
562 /* Send EEPROM memory address to read data from */
563 smbseq.bytecnt = EEPROM_WRRD_CNT;
564 eeseq.cmd = pdev->inieecmd | EEPROM_OP_READ;
565 eeseq.eeaddr = pdev->eeaddr;
566 eeseq.memaddr = cpu_to_le16(memaddr);
567 ret = pdev->smb_write(pdev, &smbseq);
568 if (ret != 0) {
569 dev_err(dev, "Failed to init eeprom addr 0x%02x",
570 memaddr);
571 break;
572 }
573
574 /* Perform read operation */
575 smbseq.bytecnt = EEPROM_RD_CNT;
576 ret = pdev->smb_read(pdev, &smbseq);
577 if (ret != 0) {
578 dev_err(dev, "Failed to read eeprom data 0x%02x",
579 memaddr);
580 break;
581 }
582
583 /* Restart read operation if the device is busy */
584 if (retry && (eeseq.cmd & EEPROM_NAERR)) {
585 dev_dbg(dev, "EEPROM busy, retry reading after %d ms",
586 EEPROM_TOUT);
587 msleep(EEPROM_TOUT);
588 continue;
589 }
590
591 /* Check whether IDT successfully read data from EEPROM */
592 if (eeseq.cmd & (EEPROM_NAERR | EEPROM_LAERR | EEPROM_MSS)) {
593 dev_err(dev,
594 "Communication with eeprom failed, cmd 0x%hhx",
595 eeseq.cmd);
596 ret = -EREMOTEIO;
597 break;
598 }
599
600 /* Save retrieved data and exit the loop */
601 *data = eeseq.data;
602 break;
603 } while (retry--);
604
605 /* Return the status of operation */
606 return ret;
607 }
608
609 /*
610 * idt_eeprom_write() - EEPROM write operation
611 * @pdev: Pointer to the driver data
612 * @memaddr: Start EEPROM memory address
613 * @len: Length of data to be written
614 * @data: Data to be written to EEPROM
615 */
idt_eeprom_write(struct idt_89hpesx_dev * pdev,u16 memaddr,u16 len,const u8 * data)616 static int idt_eeprom_write(struct idt_89hpesx_dev *pdev, u16 memaddr, u16 len,
617 const u8 *data)
618 {
619 struct device *dev = &pdev->client->dev;
620 struct idt_eeprom_seq eeseq;
621 struct idt_smb_seq smbseq;
622 int ret;
623 u16 idx;
624
625 /* Initialize SMBus sequence fields */
626 smbseq.ccode = pdev->iniccode | CCODE_EEPROM;
627 smbseq.data = (u8 *)&eeseq;
628
629 /* Send data byte-by-byte, checking if it is successfully written */
630 for (idx = 0; idx < len; idx++, memaddr++) {
631 /* Lock IDT SMBus device */
632 mutex_lock(&pdev->smb_mtx);
633
634 /* Perform write operation */
635 smbseq.bytecnt = EEPROM_WR_CNT;
636 eeseq.cmd = pdev->inieecmd | EEPROM_OP_WRITE;
637 eeseq.eeaddr = pdev->eeaddr;
638 eeseq.memaddr = cpu_to_le16(memaddr);
639 eeseq.data = data[idx];
640 ret = pdev->smb_write(pdev, &smbseq);
641 if (ret != 0) {
642 dev_err(dev,
643 "Failed to write 0x%04hx:0x%02hhx to eeprom",
644 memaddr, data[idx]);
645 goto err_mutex_unlock;
646 }
647
648 /*
649 * Check whether the data is successfully written by reading
650 * from the same EEPROM memory address.
651 */
652 eeseq.data = ~data[idx];
653 ret = idt_eeprom_read_byte(pdev, memaddr, &eeseq.data);
654 if (ret != 0)
655 goto err_mutex_unlock;
656
657 /* Check whether the read byte is the same as written one */
658 if (eeseq.data != data[idx]) {
659 dev_err(dev, "Values don't match 0x%02hhx != 0x%02hhx",
660 eeseq.data, data[idx]);
661 ret = -EREMOTEIO;
662 goto err_mutex_unlock;
663 }
664
665 /* Unlock IDT SMBus device */
666 err_mutex_unlock:
667 mutex_unlock(&pdev->smb_mtx);
668 if (ret != 0)
669 return ret;
670 }
671
672 return 0;
673 }
674
675 /*
676 * idt_eeprom_read() - EEPROM read operation
677 * @pdev: Pointer to the driver data
678 * @memaddr: Start EEPROM memory address
679 * @len: Length of data to read
680 * @buf: Buffer to read data to
681 */
idt_eeprom_read(struct idt_89hpesx_dev * pdev,u16 memaddr,u16 len,u8 * buf)682 static int idt_eeprom_read(struct idt_89hpesx_dev *pdev, u16 memaddr, u16 len,
683 u8 *buf)
684 {
685 int ret;
686 u16 idx;
687
688 /* Read data byte-by-byte, retrying if it wasn't successful */
689 for (idx = 0; idx < len; idx++, memaddr++) {
690 /* Lock IDT SMBus device */
691 mutex_lock(&pdev->smb_mtx);
692
693 /* Just read the byte to the buffer */
694 ret = idt_eeprom_read_byte(pdev, memaddr, &buf[idx]);
695
696 /* Unlock IDT SMBus device */
697 mutex_unlock(&pdev->smb_mtx);
698
699 /* Return error if read operation failed */
700 if (ret != 0)
701 return ret;
702 }
703
704 return 0;
705 }
706
707 /*===========================================================================
708 * CSR IO-operations
709 *===========================================================================
710 */
711
712 /*
713 * idt_csr_write() - CSR write operation
714 * @pdev: Pointer to the driver data
715 * @csraddr: CSR address (with no two LS bits)
716 * @data: Data to be written to CSR
717 */
idt_csr_write(struct idt_89hpesx_dev * pdev,u16 csraddr,const u32 data)718 static int idt_csr_write(struct idt_89hpesx_dev *pdev, u16 csraddr,
719 const u32 data)
720 {
721 struct device *dev = &pdev->client->dev;
722 struct idt_csr_seq csrseq;
723 struct idt_smb_seq smbseq;
724 int ret;
725
726 /* Initialize SMBus sequence fields */
727 smbseq.ccode = pdev->iniccode | CCODE_CSR;
728 smbseq.data = (u8 *)&csrseq;
729
730 /* Lock IDT SMBus device */
731 mutex_lock(&pdev->smb_mtx);
732
733 /* Perform write operation */
734 smbseq.bytecnt = CSR_WR_CNT;
735 csrseq.cmd = pdev->inicsrcmd | CSR_OP_WRITE;
736 csrseq.csraddr = cpu_to_le16(csraddr);
737 csrseq.data = cpu_to_le32(data);
738 ret = pdev->smb_write(pdev, &smbseq);
739 if (ret != 0) {
740 dev_err(dev, "Failed to write 0x%04x: 0x%04x to csr",
741 CSR_REAL_ADDR(csraddr), data);
742 goto err_mutex_unlock;
743 }
744
745 /* Send CSR address to read data from */
746 smbseq.bytecnt = CSR_WRRD_CNT;
747 csrseq.cmd = pdev->inicsrcmd | CSR_OP_READ;
748 ret = pdev->smb_write(pdev, &smbseq);
749 if (ret != 0) {
750 dev_err(dev, "Failed to init csr address 0x%04x",
751 CSR_REAL_ADDR(csraddr));
752 goto err_mutex_unlock;
753 }
754
755 /* Perform read operation */
756 smbseq.bytecnt = CSR_RD_CNT;
757 ret = pdev->smb_read(pdev, &smbseq);
758 if (ret != 0) {
759 dev_err(dev, "Failed to read csr 0x%04x",
760 CSR_REAL_ADDR(csraddr));
761 goto err_mutex_unlock;
762 }
763
764 /* Check whether IDT successfully retrieved CSR data */
765 if (csrseq.cmd & (CSR_RERR | CSR_WERR)) {
766 dev_err(dev, "IDT failed to perform CSR r/w");
767 ret = -EREMOTEIO;
768 goto err_mutex_unlock;
769 }
770
771 /* Unlock IDT SMBus device */
772 err_mutex_unlock:
773 mutex_unlock(&pdev->smb_mtx);
774
775 return ret;
776 }
777
778 /*
779 * idt_csr_read() - CSR read operation
780 * @pdev: Pointer to the driver data
781 * @csraddr: CSR address (with no two LS bits)
782 * @data: Data to be written to CSR
783 */
idt_csr_read(struct idt_89hpesx_dev * pdev,u16 csraddr,u32 * data)784 static int idt_csr_read(struct idt_89hpesx_dev *pdev, u16 csraddr, u32 *data)
785 {
786 struct device *dev = &pdev->client->dev;
787 struct idt_csr_seq csrseq;
788 struct idt_smb_seq smbseq;
789 int ret;
790
791 /* Initialize SMBus sequence fields */
792 smbseq.ccode = pdev->iniccode | CCODE_CSR;
793 smbseq.data = (u8 *)&csrseq;
794
795 /* Lock IDT SMBus device */
796 mutex_lock(&pdev->smb_mtx);
797
798 /* Send CSR register address before reading it */
799 smbseq.bytecnt = CSR_WRRD_CNT;
800 csrseq.cmd = pdev->inicsrcmd | CSR_OP_READ;
801 csrseq.csraddr = cpu_to_le16(csraddr);
802 ret = pdev->smb_write(pdev, &smbseq);
803 if (ret != 0) {
804 dev_err(dev, "Failed to init csr address 0x%04x",
805 CSR_REAL_ADDR(csraddr));
806 goto err_mutex_unlock;
807 }
808
809 /* Perform read operation */
810 smbseq.bytecnt = CSR_RD_CNT;
811 ret = pdev->smb_read(pdev, &smbseq);
812 if (ret != 0) {
813 dev_err(dev, "Failed to read csr 0x%04x",
814 CSR_REAL_ADDR(csraddr));
815 goto err_mutex_unlock;
816 }
817
818 /* Check whether IDT successfully retrieved CSR data */
819 if (csrseq.cmd & (CSR_RERR | CSR_WERR)) {
820 dev_err(dev, "IDT failed to perform CSR r/w");
821 ret = -EREMOTEIO;
822 goto err_mutex_unlock;
823 }
824
825 /* Save data retrieved from IDT */
826 *data = le32_to_cpu(csrseq.data);
827
828 /* Unlock IDT SMBus device */
829 err_mutex_unlock:
830 mutex_unlock(&pdev->smb_mtx);
831
832 return ret;
833 }
834
835 /*===========================================================================
836 * Sysfs/debugfs-nodes IO-operations
837 *===========================================================================
838 */
839
840 /*
841 * eeprom_write() - EEPROM sysfs-node write callback
842 * @filep: Pointer to the file system node
843 * @kobj: Pointer to the kernel object related to the sysfs-node
844 * @attr: Attributes of the file
845 * @buf: Buffer to write data to
846 * @off: Offset at which data should be written to
847 * @count: Number of bytes to write
848 */
eeprom_write(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count)849 static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
850 struct bin_attribute *attr,
851 char *buf, loff_t off, size_t count)
852 {
853 struct idt_89hpesx_dev *pdev;
854 int ret;
855
856 /* Retrieve driver data */
857 pdev = dev_get_drvdata(kobj_to_dev(kobj));
858
859 /* Perform EEPROM write operation */
860 ret = idt_eeprom_write(pdev, (u16)off, (u16)count, (u8 *)buf);
861 return (ret != 0 ? ret : count);
862 }
863
864 /*
865 * eeprom_read() - EEPROM sysfs-node read callback
866 * @filep: Pointer to the file system node
867 * @kobj: Pointer to the kernel object related to the sysfs-node
868 * @attr: Attributes of the file
869 * @buf: Buffer to write data to
870 * @off: Offset at which data should be written to
871 * @count: Number of bytes to write
872 */
eeprom_read(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count)873 static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
874 struct bin_attribute *attr,
875 char *buf, loff_t off, size_t count)
876 {
877 struct idt_89hpesx_dev *pdev;
878 int ret;
879
880 /* Retrieve driver data */
881 pdev = dev_get_drvdata(kobj_to_dev(kobj));
882
883 /* Perform EEPROM read operation */
884 ret = idt_eeprom_read(pdev, (u16)off, (u16)count, (u8 *)buf);
885 return (ret != 0 ? ret : count);
886 }
887
888 /*
889 * idt_dbgfs_csr_write() - CSR debugfs-node write callback
890 * @filep: Pointer to the file system file descriptor
891 * @buf: Buffer to read data from
892 * @count: Size of the buffer
893 * @offp: Offset within the file
894 *
895 * It accepts either "0x<reg addr>:0x<value>" for saving register address
896 * and writing value to specified DWORD register or "0x<reg addr>" for
897 * just saving register address in order to perform next read operation.
898 *
899 * WARNING No spaces are allowed. Incoming string must be strictly formated as:
900 * "<reg addr>:<value>". Register address must be aligned within 4 bytes
901 * (one DWORD).
902 */
idt_dbgfs_csr_write(struct file * filep,const char __user * ubuf,size_t count,loff_t * offp)903 static ssize_t idt_dbgfs_csr_write(struct file *filep, const char __user *ubuf,
904 size_t count, loff_t *offp)
905 {
906 struct idt_89hpesx_dev *pdev = filep->private_data;
907 char *colon_ch, *csraddr_str, *csrval_str;
908 int ret, csraddr_len;
909 u32 csraddr, csrval;
910 char *buf;
911
912 if (*offp)
913 return 0;
914
915 /* Copy data from User-space */
916 buf = memdup_user_nul(ubuf, count);
917 if (IS_ERR(buf))
918 return PTR_ERR(buf);
919
920 /* Find position of colon in the buffer */
921 colon_ch = strnchr(buf, count, ':');
922
923 /*
924 * If there is colon passed then new CSR value should be parsed as
925 * well, so allocate buffer for CSR address substring.
926 * If no colon is found, then string must have just one number with
927 * no new CSR value
928 */
929 if (colon_ch != NULL) {
930 csraddr_len = colon_ch - buf;
931 csraddr_str =
932 kmalloc(csraddr_len + 1, GFP_KERNEL);
933 if (csraddr_str == NULL) {
934 ret = -ENOMEM;
935 goto free_buf;
936 }
937 /* Copy the register address to the substring buffer */
938 strncpy(csraddr_str, buf, csraddr_len);
939 csraddr_str[csraddr_len] = '\0';
940 /* Register value must follow the colon */
941 csrval_str = colon_ch + 1;
942 } else /* if (str_colon == NULL) */ {
943 csraddr_str = (char *)buf; /* Just to shut warning up */
944 csraddr_len = strnlen(csraddr_str, count);
945 csrval_str = NULL;
946 }
947
948 /* Convert CSR address to u32 value */
949 ret = kstrtou32(csraddr_str, 0, &csraddr);
950 if (ret != 0)
951 goto free_csraddr_str;
952
953 /* Check whether passed register address is valid */
954 if (csraddr > CSR_MAX || !IS_ALIGNED(csraddr, SZ_4)) {
955 ret = -EINVAL;
956 goto free_csraddr_str;
957 }
958
959 /* Shift register address to the right so to have u16 address */
960 pdev->csr = (csraddr >> 2);
961
962 /* Parse new CSR value and send it to IDT, if colon has been found */
963 if (colon_ch != NULL) {
964 ret = kstrtou32(csrval_str, 0, &csrval);
965 if (ret != 0)
966 goto free_csraddr_str;
967
968 ret = idt_csr_write(pdev, pdev->csr, csrval);
969 if (ret != 0)
970 goto free_csraddr_str;
971 }
972
973 /* Free memory only if colon has been found */
974 free_csraddr_str:
975 if (colon_ch != NULL)
976 kfree(csraddr_str);
977
978 /* Free buffer allocated for data retrieved from User-space */
979 free_buf:
980 kfree(buf);
981
982 return (ret != 0 ? ret : count);
983 }
984
985 /*
986 * idt_dbgfs_csr_read() - CSR debugfs-node read callback
987 * @filep: Pointer to the file system file descriptor
988 * @buf: Buffer to write data to
989 * @count: Size of the buffer
990 * @offp: Offset within the file
991 *
992 * It just prints the pair "0x<reg addr>:0x<value>" to passed buffer.
993 */
994 #define CSRBUF_SIZE ((size_t)32)
idt_dbgfs_csr_read(struct file * filep,char __user * ubuf,size_t count,loff_t * offp)995 static ssize_t idt_dbgfs_csr_read(struct file *filep, char __user *ubuf,
996 size_t count, loff_t *offp)
997 {
998 struct idt_89hpesx_dev *pdev = filep->private_data;
999 u32 csraddr, csrval;
1000 char buf[CSRBUF_SIZE];
1001 int ret, size;
1002
1003 /* Perform CSR read operation */
1004 ret = idt_csr_read(pdev, pdev->csr, &csrval);
1005 if (ret != 0)
1006 return ret;
1007
1008 /* Shift register address to the left so to have real address */
1009 csraddr = ((u32)pdev->csr << 2);
1010
1011 /* Print the "0x<reg addr>:0x<value>" to buffer */
1012 size = snprintf(buf, CSRBUF_SIZE, "0x%05x:0x%08x\n",
1013 (unsigned int)csraddr, (unsigned int)csrval);
1014
1015 /* Copy data to User-space */
1016 return simple_read_from_buffer(ubuf, count, offp, buf, size);
1017 }
1018
1019 /*
1020 * eeprom_attribute - EEPROM sysfs-node attributes
1021 *
1022 * NOTE Size will be changed in compliance with OF node. EEPROM attribute will
1023 * be read-only as well if the corresponding flag is specified in OF node.
1024 */
1025 static BIN_ATTR_RW(eeprom, EEPROM_DEF_SIZE);
1026
1027 /*
1028 * csr_dbgfs_ops - CSR debugfs-node read/write operations
1029 */
1030 static const struct file_operations csr_dbgfs_ops = {
1031 .owner = THIS_MODULE,
1032 .open = simple_open,
1033 .write = idt_dbgfs_csr_write,
1034 .read = idt_dbgfs_csr_read
1035 };
1036
1037 /*===========================================================================
1038 * Driver init/deinit methods
1039 *===========================================================================
1040 */
1041
1042 /*
1043 * idt_set_defval() - disable EEPROM access by default
1044 * @pdev: Pointer to the driver data
1045 */
idt_set_defval(struct idt_89hpesx_dev * pdev)1046 static void idt_set_defval(struct idt_89hpesx_dev *pdev)
1047 {
1048 /* If OF info is missing then use next values */
1049 pdev->eesize = 0;
1050 pdev->eero = true;
1051 pdev->inieecmd = 0;
1052 pdev->eeaddr = 0;
1053 }
1054
1055 static const struct i2c_device_id ee_ids[];
1056
1057 /*
1058 * idt_ee_match_id() - check whether the node belongs to compatible EEPROMs
1059 */
idt_ee_match_id(struct fwnode_handle * fwnode)1060 static const struct i2c_device_id *idt_ee_match_id(struct fwnode_handle *fwnode)
1061 {
1062 const struct i2c_device_id *id = ee_ids;
1063 const char *compatible, *p;
1064 char devname[I2C_NAME_SIZE];
1065 int ret;
1066
1067 ret = fwnode_property_read_string(fwnode, "compatible", &compatible);
1068 if (ret)
1069 return NULL;
1070
1071 p = strchr(compatible, ',');
1072 strscpy(devname, p ? p + 1 : compatible, sizeof(devname));
1073 /* Search through the device name */
1074 while (id->name[0]) {
1075 if (strcmp(devname, id->name) == 0)
1076 return id;
1077 id++;
1078 }
1079 return NULL;
1080 }
1081
1082 /*
1083 * idt_get_fw_data() - get IDT i2c-device parameters from device tree
1084 * @pdev: Pointer to the driver data
1085 */
idt_get_fw_data(struct idt_89hpesx_dev * pdev)1086 static void idt_get_fw_data(struct idt_89hpesx_dev *pdev)
1087 {
1088 struct device *dev = &pdev->client->dev;
1089 struct fwnode_handle *fwnode;
1090 const struct i2c_device_id *ee_id = NULL;
1091 u32 eeprom_addr;
1092 int ret;
1093
1094 device_for_each_child_node(dev, fwnode) {
1095 ee_id = idt_ee_match_id(fwnode);
1096 if (ee_id)
1097 break;
1098
1099 dev_warn(dev, "Skip unsupported EEPROM device %pfw\n", fwnode);
1100 }
1101
1102 /* If there is no fwnode EEPROM device, then set zero size */
1103 if (!ee_id) {
1104 dev_warn(dev, "No fwnode, EEPROM access disabled");
1105 idt_set_defval(pdev);
1106 return;
1107 }
1108
1109 /* Retrieve EEPROM size */
1110 pdev->eesize = (u32)ee_id->driver_data;
1111
1112 /* Get custom EEPROM address from 'reg' attribute */
1113 ret = fwnode_property_read_u32(fwnode, "reg", &eeprom_addr);
1114 if (ret || (eeprom_addr == 0)) {
1115 dev_warn(dev, "No EEPROM reg found, use default address 0x%x",
1116 EEPROM_DEF_ADDR);
1117 pdev->inieecmd = 0;
1118 pdev->eeaddr = EEPROM_DEF_ADDR << 1;
1119 } else {
1120 pdev->inieecmd = EEPROM_USA;
1121 pdev->eeaddr = eeprom_addr << 1;
1122 }
1123
1124 /* Check EEPROM 'read-only' flag */
1125 if (fwnode_property_read_bool(fwnode, "read-only"))
1126 pdev->eero = true;
1127 else /* if (!fwnode_property_read_bool(node, "read-only")) */
1128 pdev->eero = false;
1129
1130 fwnode_handle_put(fwnode);
1131 dev_info(dev, "EEPROM of %d bytes found by 0x%x",
1132 pdev->eesize, pdev->eeaddr);
1133 }
1134
1135 /*
1136 * idt_create_pdev() - create and init data structure of the driver
1137 * @client: i2c client of IDT PCIe-switch device
1138 */
idt_create_pdev(struct i2c_client * client)1139 static struct idt_89hpesx_dev *idt_create_pdev(struct i2c_client *client)
1140 {
1141 struct idt_89hpesx_dev *pdev;
1142
1143 /* Allocate memory for driver data */
1144 pdev = devm_kmalloc(&client->dev, sizeof(struct idt_89hpesx_dev),
1145 GFP_KERNEL);
1146 if (pdev == NULL)
1147 return ERR_PTR(-ENOMEM);
1148
1149 /* Initialize basic fields of the data */
1150 pdev->client = client;
1151 i2c_set_clientdata(client, pdev);
1152
1153 /* Read firmware nodes information */
1154 idt_get_fw_data(pdev);
1155
1156 /* Initialize basic CSR CMD field - use full DWORD-sized r/w ops */
1157 pdev->inicsrcmd = CSR_DWE;
1158 pdev->csr = CSR_DEF;
1159
1160 /* Enable Packet Error Checking if it's supported by adapter */
1161 if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_PEC)) {
1162 pdev->iniccode = CCODE_PEC;
1163 client->flags |= I2C_CLIENT_PEC;
1164 } else /* PEC is unsupported */ {
1165 pdev->iniccode = 0;
1166 }
1167
1168 return pdev;
1169 }
1170
1171 /*
1172 * idt_free_pdev() - free data structure of the driver
1173 * @pdev: Pointer to the driver data
1174 */
idt_free_pdev(struct idt_89hpesx_dev * pdev)1175 static void idt_free_pdev(struct idt_89hpesx_dev *pdev)
1176 {
1177 /* Clear driver data from device private field */
1178 i2c_set_clientdata(pdev->client, NULL);
1179 }
1180
1181 /*
1182 * idt_set_smbus_ops() - set supported SMBus operations
1183 * @pdev: Pointer to the driver data
1184 * Return status of smbus check operations
1185 */
idt_set_smbus_ops(struct idt_89hpesx_dev * pdev)1186 static int idt_set_smbus_ops(struct idt_89hpesx_dev *pdev)
1187 {
1188 struct i2c_adapter *adapter = pdev->client->adapter;
1189 struct device *dev = &pdev->client->dev;
1190
1191 /* Check i2c adapter read functionality */
1192 if (i2c_check_functionality(adapter,
1193 I2C_FUNC_SMBUS_READ_BLOCK_DATA)) {
1194 pdev->smb_read = idt_smb_read_block;
1195 dev_dbg(dev, "SMBus block-read op chosen");
1196 } else if (i2c_check_functionality(adapter,
1197 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
1198 pdev->smb_read = idt_smb_read_i2c_block;
1199 dev_dbg(dev, "SMBus i2c-block-read op chosen");
1200 } else if (i2c_check_functionality(adapter,
1201 I2C_FUNC_SMBUS_READ_WORD_DATA) &&
1202 i2c_check_functionality(adapter,
1203 I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
1204 pdev->smb_read = idt_smb_read_word;
1205 dev_warn(dev, "Use slow word/byte SMBus read ops");
1206 } else if (i2c_check_functionality(adapter,
1207 I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
1208 pdev->smb_read = idt_smb_read_byte;
1209 dev_warn(dev, "Use slow byte SMBus read op");
1210 } else /* no supported smbus read operations */ {
1211 dev_err(dev, "No supported SMBus read op");
1212 return -EPFNOSUPPORT;
1213 }
1214
1215 /* Check i2c adapter write functionality */
1216 if (i2c_check_functionality(adapter,
1217 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) {
1218 pdev->smb_write = idt_smb_write_block;
1219 dev_dbg(dev, "SMBus block-write op chosen");
1220 } else if (i2c_check_functionality(adapter,
1221 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
1222 pdev->smb_write = idt_smb_write_i2c_block;
1223 dev_dbg(dev, "SMBus i2c-block-write op chosen");
1224 } else if (i2c_check_functionality(adapter,
1225 I2C_FUNC_SMBUS_WRITE_WORD_DATA) &&
1226 i2c_check_functionality(adapter,
1227 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
1228 pdev->smb_write = idt_smb_write_word;
1229 dev_warn(dev, "Use slow word/byte SMBus write op");
1230 } else if (i2c_check_functionality(adapter,
1231 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
1232 pdev->smb_write = idt_smb_write_byte;
1233 dev_warn(dev, "Use slow byte SMBus write op");
1234 } else /* no supported smbus write operations */ {
1235 dev_err(dev, "No supported SMBus write op");
1236 return -EPFNOSUPPORT;
1237 }
1238
1239 /* Initialize IDT SMBus slave interface mutex */
1240 mutex_init(&pdev->smb_mtx);
1241
1242 return 0;
1243 }
1244
1245 /*
1246 * idt_check_dev() - check whether it's really IDT 89HPESx device
1247 * @pdev: Pointer to the driver data
1248 * Return status of i2c adapter check operation
1249 */
idt_check_dev(struct idt_89hpesx_dev * pdev)1250 static int idt_check_dev(struct idt_89hpesx_dev *pdev)
1251 {
1252 struct device *dev = &pdev->client->dev;
1253 u32 viddid;
1254 int ret;
1255
1256 /* Read VID and DID directly from IDT memory space */
1257 ret = idt_csr_read(pdev, IDT_VIDDID_CSR, &viddid);
1258 if (ret != 0) {
1259 dev_err(dev, "Failed to read VID/DID");
1260 return ret;
1261 }
1262
1263 /* Check whether it's IDT device */
1264 if ((viddid & IDT_VID_MASK) != PCI_VENDOR_ID_IDT) {
1265 dev_err(dev, "Got unsupported VID/DID: 0x%08x", viddid);
1266 return -ENODEV;
1267 }
1268
1269 dev_info(dev, "Found IDT 89HPES device VID:0x%04x, DID:0x%04x",
1270 (viddid & IDT_VID_MASK), (viddid >> 16));
1271
1272 return 0;
1273 }
1274
1275 /*
1276 * idt_create_sysfs_files() - create sysfs attribute files
1277 * @pdev: Pointer to the driver data
1278 * Return status of operation
1279 */
idt_create_sysfs_files(struct idt_89hpesx_dev * pdev)1280 static int idt_create_sysfs_files(struct idt_89hpesx_dev *pdev)
1281 {
1282 struct device *dev = &pdev->client->dev;
1283 int ret;
1284
1285 /* Don't do anything if EEPROM isn't accessible */
1286 if (pdev->eesize == 0) {
1287 dev_dbg(dev, "Skip creating sysfs-files");
1288 return 0;
1289 }
1290
1291 /*
1292 * Allocate memory for attribute file and copy the declared EEPROM attr
1293 * structure to change some of fields
1294 */
1295 pdev->ee_file = devm_kmemdup(dev, &bin_attr_eeprom,
1296 sizeof(*pdev->ee_file), GFP_KERNEL);
1297 if (!pdev->ee_file)
1298 return -ENOMEM;
1299
1300 /* In case of read-only EEPROM get rid of write ability */
1301 if (pdev->eero) {
1302 pdev->ee_file->attr.mode &= ~0200;
1303 pdev->ee_file->write = NULL;
1304 }
1305 /* Create EEPROM sysfs file */
1306 pdev->ee_file->size = pdev->eesize;
1307 ret = sysfs_create_bin_file(&dev->kobj, pdev->ee_file);
1308 if (ret != 0) {
1309 dev_err(dev, "Failed to create EEPROM sysfs-node");
1310 return ret;
1311 }
1312
1313 return 0;
1314 }
1315
1316 /*
1317 * idt_remove_sysfs_files() - remove sysfs attribute files
1318 * @pdev: Pointer to the driver data
1319 */
idt_remove_sysfs_files(struct idt_89hpesx_dev * pdev)1320 static void idt_remove_sysfs_files(struct idt_89hpesx_dev *pdev)
1321 {
1322 struct device *dev = &pdev->client->dev;
1323
1324 /* Don't do anything if EEPROM wasn't accessible */
1325 if (pdev->eesize == 0)
1326 return;
1327
1328 /* Remove EEPROM sysfs file */
1329 sysfs_remove_bin_file(&dev->kobj, pdev->ee_file);
1330 }
1331
1332 /*
1333 * idt_create_dbgfs_files() - create debugfs files
1334 * @pdev: Pointer to the driver data
1335 */
1336 #define CSRNAME_LEN ((size_t)32)
idt_create_dbgfs_files(struct idt_89hpesx_dev * pdev)1337 static void idt_create_dbgfs_files(struct idt_89hpesx_dev *pdev)
1338 {
1339 struct i2c_client *cli = pdev->client;
1340 char fname[CSRNAME_LEN];
1341
1342 /* Create Debugfs directory for CSR file */
1343 snprintf(fname, CSRNAME_LEN, "%d-%04hx", cli->adapter->nr, cli->addr);
1344 pdev->csr_dir = debugfs_create_dir(fname, csr_dbgdir);
1345
1346 /* Create Debugfs file for CSR read/write operations */
1347 debugfs_create_file(cli->name, 0600, pdev->csr_dir, pdev,
1348 &csr_dbgfs_ops);
1349 }
1350
1351 /*
1352 * idt_remove_dbgfs_files() - remove debugfs files
1353 * @pdev: Pointer to the driver data
1354 */
idt_remove_dbgfs_files(struct idt_89hpesx_dev * pdev)1355 static void idt_remove_dbgfs_files(struct idt_89hpesx_dev *pdev)
1356 {
1357 /* Remove CSR directory and it sysfs-node */
1358 debugfs_remove_recursive(pdev->csr_dir);
1359 }
1360
1361 /*
1362 * idt_probe() - IDT 89HPESx driver probe() callback method
1363 */
idt_probe(struct i2c_client * client)1364 static int idt_probe(struct i2c_client *client)
1365 {
1366 struct idt_89hpesx_dev *pdev;
1367 int ret;
1368
1369 /* Create driver data */
1370 pdev = idt_create_pdev(client);
1371 if (IS_ERR(pdev))
1372 return PTR_ERR(pdev);
1373
1374 /* Set SMBus operations */
1375 ret = idt_set_smbus_ops(pdev);
1376 if (ret != 0)
1377 goto err_free_pdev;
1378
1379 /* Check whether it is truly IDT 89HPESx device */
1380 ret = idt_check_dev(pdev);
1381 if (ret != 0)
1382 goto err_free_pdev;
1383
1384 /* Create sysfs files */
1385 ret = idt_create_sysfs_files(pdev);
1386 if (ret != 0)
1387 goto err_free_pdev;
1388
1389 /* Create debugfs files */
1390 idt_create_dbgfs_files(pdev);
1391
1392 return 0;
1393
1394 err_free_pdev:
1395 idt_free_pdev(pdev);
1396
1397 return ret;
1398 }
1399
1400 /*
1401 * idt_remove() - IDT 89HPESx driver remove() callback method
1402 */
idt_remove(struct i2c_client * client)1403 static void idt_remove(struct i2c_client *client)
1404 {
1405 struct idt_89hpesx_dev *pdev = i2c_get_clientdata(client);
1406
1407 /* Remove debugfs files first */
1408 idt_remove_dbgfs_files(pdev);
1409
1410 /* Remove sysfs files */
1411 idt_remove_sysfs_files(pdev);
1412
1413 /* Discard driver data structure */
1414 idt_free_pdev(pdev);
1415 }
1416
1417 /*
1418 * ee_ids - array of supported EEPROMs
1419 */
1420 static const struct i2c_device_id ee_ids[] = {
1421 { "24c32", 4096},
1422 { "24c64", 8192},
1423 { "24c128", 16384},
1424 { "24c256", 32768},
1425 { "24c512", 65536},
1426 {}
1427 };
1428 MODULE_DEVICE_TABLE(i2c, ee_ids);
1429
1430 /*
1431 * idt_ids - supported IDT 89HPESx devices
1432 */
1433 static const struct i2c_device_id idt_ids[] = {
1434 { "89hpes8nt2", 0 },
1435 { "89hpes12nt3", 0 },
1436
1437 { "89hpes24nt6ag2", 0 },
1438 { "89hpes32nt8ag2", 0 },
1439 { "89hpes32nt8bg2", 0 },
1440 { "89hpes12nt12g2", 0 },
1441 { "89hpes16nt16g2", 0 },
1442 { "89hpes24nt24g2", 0 },
1443 { "89hpes32nt24ag2", 0 },
1444 { "89hpes32nt24bg2", 0 },
1445
1446 { "89hpes12n3", 0 },
1447 { "89hpes12n3a", 0 },
1448 { "89hpes24n3", 0 },
1449 { "89hpes24n3a", 0 },
1450
1451 { "89hpes32h8", 0 },
1452 { "89hpes32h8g2", 0 },
1453 { "89hpes48h12", 0 },
1454 { "89hpes48h12g2", 0 },
1455 { "89hpes48h12ag2", 0 },
1456 { "89hpes16h16", 0 },
1457 { "89hpes22h16", 0 },
1458 { "89hpes22h16g2", 0 },
1459 { "89hpes34h16", 0 },
1460 { "89hpes34h16g2", 0 },
1461 { "89hpes64h16", 0 },
1462 { "89hpes64h16g2", 0 },
1463 { "89hpes64h16ag2", 0 },
1464
1465 /* { "89hpes3t3", 0 }, // No SMBus-slave iface */
1466 { "89hpes12t3g2", 0 },
1467 { "89hpes24t3g2", 0 },
1468 /* { "89hpes4t4", 0 }, // No SMBus-slave iface */
1469 { "89hpes16t4", 0 },
1470 { "89hpes4t4g2", 0 },
1471 { "89hpes10t4g2", 0 },
1472 { "89hpes16t4g2", 0 },
1473 { "89hpes16t4ag2", 0 },
1474 { "89hpes5t5", 0 },
1475 { "89hpes6t5", 0 },
1476 { "89hpes8t5", 0 },
1477 { "89hpes8t5a", 0 },
1478 { "89hpes24t6", 0 },
1479 { "89hpes6t6g2", 0 },
1480 { "89hpes24t6g2", 0 },
1481 { "89hpes16t7", 0 },
1482 { "89hpes32t8", 0 },
1483 { "89hpes32t8g2", 0 },
1484 { "89hpes48t12", 0 },
1485 { "89hpes48t12g2", 0 },
1486 { /* END OF LIST */ }
1487 };
1488 MODULE_DEVICE_TABLE(i2c, idt_ids);
1489
1490 static const struct of_device_id idt_of_match[] = {
1491 { .compatible = "idt,89hpes8nt2", },
1492 { .compatible = "idt,89hpes12nt3", },
1493
1494 { .compatible = "idt,89hpes24nt6ag2", },
1495 { .compatible = "idt,89hpes32nt8ag2", },
1496 { .compatible = "idt,89hpes32nt8bg2", },
1497 { .compatible = "idt,89hpes12nt12g2", },
1498 { .compatible = "idt,89hpes16nt16g2", },
1499 { .compatible = "idt,89hpes24nt24g2", },
1500 { .compatible = "idt,89hpes32nt24ag2", },
1501 { .compatible = "idt,89hpes32nt24bg2", },
1502
1503 { .compatible = "idt,89hpes12n3", },
1504 { .compatible = "idt,89hpes12n3a", },
1505 { .compatible = "idt,89hpes24n3", },
1506 { .compatible = "idt,89hpes24n3a", },
1507
1508 { .compatible = "idt,89hpes32h8", },
1509 { .compatible = "idt,89hpes32h8g2", },
1510 { .compatible = "idt,89hpes48h12", },
1511 { .compatible = "idt,89hpes48h12g2", },
1512 { .compatible = "idt,89hpes48h12ag2", },
1513 { .compatible = "idt,89hpes16h16", },
1514 { .compatible = "idt,89hpes22h16", },
1515 { .compatible = "idt,89hpes22h16g2", },
1516 { .compatible = "idt,89hpes34h16", },
1517 { .compatible = "idt,89hpes34h16g2", },
1518 { .compatible = "idt,89hpes64h16", },
1519 { .compatible = "idt,89hpes64h16g2", },
1520 { .compatible = "idt,89hpes64h16ag2", },
1521
1522 { .compatible = "idt,89hpes12t3g2", },
1523 { .compatible = "idt,89hpes24t3g2", },
1524
1525 { .compatible = "idt,89hpes16t4", },
1526 { .compatible = "idt,89hpes4t4g2", },
1527 { .compatible = "idt,89hpes10t4g2", },
1528 { .compatible = "idt,89hpes16t4g2", },
1529 { .compatible = "idt,89hpes16t4ag2", },
1530 { .compatible = "idt,89hpes5t5", },
1531 { .compatible = "idt,89hpes6t5", },
1532 { .compatible = "idt,89hpes8t5", },
1533 { .compatible = "idt,89hpes8t5a", },
1534 { .compatible = "idt,89hpes24t6", },
1535 { .compatible = "idt,89hpes6t6g2", },
1536 { .compatible = "idt,89hpes24t6g2", },
1537 { .compatible = "idt,89hpes16t7", },
1538 { .compatible = "idt,89hpes32t8", },
1539 { .compatible = "idt,89hpes32t8g2", },
1540 { .compatible = "idt,89hpes48t12", },
1541 { .compatible = "idt,89hpes48t12g2", },
1542 { },
1543 };
1544 MODULE_DEVICE_TABLE(of, idt_of_match);
1545
1546 /*
1547 * idt_driver - IDT 89HPESx driver structure
1548 */
1549 static struct i2c_driver idt_driver = {
1550 .driver = {
1551 .name = IDT_NAME,
1552 .of_match_table = idt_of_match,
1553 },
1554 .probe = idt_probe,
1555 .remove = idt_remove,
1556 .id_table = idt_ids,
1557 };
1558
1559 /*
1560 * idt_init() - IDT 89HPESx driver init() callback method
1561 */
idt_init(void)1562 static int __init idt_init(void)
1563 {
1564 int ret;
1565
1566 /* Create Debugfs directory first */
1567 if (debugfs_initialized())
1568 csr_dbgdir = debugfs_create_dir("idt_csr", NULL);
1569
1570 /* Add new i2c-device driver */
1571 ret = i2c_add_driver(&idt_driver);
1572 if (ret) {
1573 debugfs_remove_recursive(csr_dbgdir);
1574 return ret;
1575 }
1576
1577 return 0;
1578 }
1579 module_init(idt_init);
1580
1581 /*
1582 * idt_exit() - IDT 89HPESx driver exit() callback method
1583 */
idt_exit(void)1584 static void __exit idt_exit(void)
1585 {
1586 /* Discard debugfs directory and all files if any */
1587 debugfs_remove_recursive(csr_dbgdir);
1588
1589 /* Unregister i2c-device driver */
1590 i2c_del_driver(&idt_driver);
1591 }
1592 module_exit(idt_exit);
1593