Lines Matching +full:no +full:- +full:read +full:- +full:rollover
1 // SPDX-License-Identifier: GPL-2.0-or-later
21 #include <linux/nvmem-provider.h>
49 #define AT25_RDSR 0x05 /* read status register */
51 #define AT25_READ 0x03 /* read byte(s) */
54 #define FM25_RDID 0x9f /* read device ID */
55 #define FM25_RDSN 0xc3 /* read S/N */
57 #define AT25_SR_nRDY 0x01 /* nRDY = write-in-progress */
73 /*-------------------------------------------------------------------------*/
82 size_t max_chunk = spi_max_transfer_size(at25->spi); in at25_ee_read()
92 if (unlikely(offset >= at25->chip.byte_len)) in at25_ee_read()
93 return -EINVAL; in at25_ee_read()
94 if ((offset + count) > at25->chip.byte_len) in at25_ee_read()
95 count = at25->chip.byte_len - offset; in at25_ee_read()
97 return -EINVAL; in at25_ee_read()
101 cp = at25->command; in at25_ee_read()
104 if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR) in at25_ee_read()
105 if (msg_offset >= BIT(at25->addrlen * 8)) in at25_ee_read()
108 mutex_lock(&at25->lock); in at25_ee_read()
112 /* 8/16/24-bit address is written MSB first */ in at25_ee_read()
113 switch (at25->addrlen) { in at25_ee_read()
128 t[0].tx_buf = at25->command; in at25_ee_read()
129 t[0].len = at25->addrlen + 1; in at25_ee_read()
136 status = spi_sync(at25->spi, &m); in at25_ee_read()
138 mutex_unlock(&at25->lock); in at25_ee_read()
145 bytes_left -= segment; in at25_ee_read()
148 dev_dbg(&at25->spi->dev, "read %zu bytes at %d\n", in at25_ee_read()
153 /* Read extra registers as ID or serial number */
164 t[0].tx_buf = at25->command; in fm25_aux_read()
172 mutex_lock(&at25->lock); in fm25_aux_read()
174 at25->command[0] = command; in fm25_aux_read()
176 status = spi_sync(at25->spi, &m); in fm25_aux_read()
177 dev_dbg(&at25->spi->dev, "read %d aux bytes --> %d\n", len, status); in fm25_aux_read()
179 mutex_unlock(&at25->lock); in fm25_aux_read()
188 return sysfs_emit(buf, "%*ph\n", (int)sizeof(at25->sernum), at25->sernum); in sernum_show()
201 size_t maxsz = spi_max_transfer_size(at25->spi); in at25_ee_write()
207 if (unlikely(off >= at25->chip.byte_len)) in at25_ee_write()
208 return -EFBIG; in at25_ee_write()
209 if ((off + count) > at25->chip.byte_len) in at25_ee_write()
210 count = at25->chip.byte_len - off; in at25_ee_write()
212 return -EINVAL; in at25_ee_write()
215 buf_size = at25->chip.page_size; in at25_ee_write()
218 bounce = kmalloc(buf_size + at25->addrlen + 1, GFP_KERNEL); in at25_ee_write()
220 return -ENOMEM; in at25_ee_write()
223 * For write, rollover is within the page ... so we write at in at25_ee_write()
226 mutex_lock(&at25->lock); in at25_ee_write()
236 status = spi_write(at25->spi, cp, 1); in at25_ee_write()
238 dev_dbg(&at25->spi->dev, "WREN --> %d\n", status); in at25_ee_write()
243 if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR) in at25_ee_write()
244 if (offset >= BIT(at25->addrlen * 8)) in at25_ee_write()
248 /* 8/16/24-bit address is written MSB first */ in at25_ee_write()
249 switch (at25->addrlen) { in at25_ee_write()
262 segment = buf_size - (offset % buf_size); in at25_ee_write()
268 status = spi_write(at25->spi, bounce, in at25_ee_write()
269 segment + at25->addrlen + 1); in at25_ee_write()
270 dev_dbg(&at25->spi->dev, "write %u bytes at %u --> %d\n", in at25_ee_write()
277 * to read-only sections of the EEPROM... in at25_ee_write()
280 /* Wait for non-busy status */ in at25_ee_write()
285 sr = spi_w8r8(at25->spi, AT25_RDSR); in at25_ee_write()
287 dev_dbg(&at25->spi->dev, in at25_ee_write()
288 "rdsr --> %d (%02x)\n", sr, sr); in at25_ee_write()
298 dev_err(&at25->spi->dev, in at25_ee_write()
301 jiffies_to_msecs(jiffies - in at25_ee_write()
302 (timeout - EE_TIMEOUT))); in at25_ee_write()
303 status = -ETIMEDOUT; in at25_ee_write()
309 count -= segment; in at25_ee_write()
313 mutex_unlock(&at25->lock); in at25_ee_write()
319 /*-------------------------------------------------------------------------*/
326 strscpy(chip->name, "at25", sizeof(chip->name)); in at25_fw_to_chip()
330 err = device_property_read_u32(dev, "at25,byte-len", &val); in at25_fw_to_chip()
335 chip->byte_len = val; in at25_fw_to_chip()
339 err = device_property_read_u32(dev, "at25,page-size", &val); in at25_fw_to_chip()
344 chip->page_size = val; in at25_fw_to_chip()
346 err = device_property_read_u32(dev, "address-width", &val); in at25_fw_to_chip()
348 err = device_property_read_u32(dev, "at25,addr-mode", &val); in at25_fw_to_chip()
350 dev_err(dev, "Error: missing \"address-width\" property\n"); in at25_fw_to_chip()
353 chip->flags = (u16)val; in at25_fw_to_chip()
357 chip->flags |= EE_INSTR_BIT3_IS_ADDR; in at25_fw_to_chip()
360 chip->flags |= EE_ADDR1; in at25_fw_to_chip()
363 chip->flags |= EE_ADDR2; in at25_fw_to_chip()
366 chip->flags |= EE_ADDR3; in at25_fw_to_chip()
370 "Error: bad \"address-width\" property: %u\n", in at25_fw_to_chip()
372 return -ENODEV; in at25_fw_to_chip()
374 if (device_property_present(dev, "read-only")) in at25_fw_to_chip()
375 chip->flags |= EE_READONLY; in at25_fw_to_chip()
387 strscpy(chip->name, "fm25", sizeof(chip->name)); in at25_fram_to_chip()
392 dev_err(dev, "Error: no Cypress FRAM (id %02x)\n", id[6]); in at25_fram_to_chip()
393 return -ENODEV; in at25_fram_to_chip()
398 return -ENODEV; in at25_fram_to_chip()
401 chip->byte_len = BIT(id[7] - 0x21 + 4) * 1024; in at25_fram_to_chip()
402 if (chip->byte_len > 64 * 1024) in at25_fram_to_chip()
403 chip->flags |= EE_ADDR3; in at25_fram_to_chip()
405 chip->flags |= EE_ADDR2; in at25_fram_to_chip()
411 at25->sernum[i] = sernum[FM25_SN_LEN - 1 - i]; in at25_fram_to_chip()
414 chip->page_size = PAGE_SIZE; in at25_fram_to_chip()
440 err = device_property_match_string(&spi->dev, "compatible", "cypress,fm25"); in at25_probe()
453 dev_dbg(&spi->dev, "rdsr --> %d (%02x)\n", sr, sr); in at25_probe()
454 return -ENXIO; in at25_probe()
457 at25 = devm_kzalloc(&spi->dev, sizeof(*at25), GFP_KERNEL); in at25_probe()
459 return -ENOMEM; in at25_probe()
461 mutex_init(&at25->lock); in at25_probe()
462 at25->spi = spi; in at25_probe()
466 pdata = dev_get_platdata(&spi->dev); in at25_probe()
468 at25->chip = *pdata; in at25_probe()
471 err = at25_fram_to_chip(&spi->dev, &at25->chip); in at25_probe()
473 err = at25_fw_to_chip(&spi->dev, &at25->chip); in at25_probe()
479 if (at25->chip.flags & EE_ADDR1) in at25_probe()
480 at25->addrlen = 1; in at25_probe()
481 else if (at25->chip.flags & EE_ADDR2) in at25_probe()
482 at25->addrlen = 2; in at25_probe()
483 else if (at25->chip.flags & EE_ADDR3) in at25_probe()
484 at25->addrlen = 3; in at25_probe()
486 dev_dbg(&spi->dev, "unsupported address type\n"); in at25_probe()
487 return -EINVAL; in at25_probe()
490 at25->nvmem_config.type = is_fram ? NVMEM_TYPE_FRAM : NVMEM_TYPE_EEPROM; in at25_probe()
491 at25->nvmem_config.name = dev_name(&spi->dev); in at25_probe()
492 at25->nvmem_config.dev = &spi->dev; in at25_probe()
493 at25->nvmem_config.read_only = at25->chip.flags & EE_READONLY; in at25_probe()
494 at25->nvmem_config.root_only = true; in at25_probe()
495 at25->nvmem_config.owner = THIS_MODULE; in at25_probe()
496 at25->nvmem_config.compat = true; in at25_probe()
497 at25->nvmem_config.base_dev = &spi->dev; in at25_probe()
498 at25->nvmem_config.reg_read = at25_ee_read; in at25_probe()
499 at25->nvmem_config.reg_write = at25_ee_write; in at25_probe()
500 at25->nvmem_config.priv = at25; in at25_probe()
501 at25->nvmem_config.stride = 1; in at25_probe()
502 at25->nvmem_config.word_size = 1; in at25_probe()
503 at25->nvmem_config.size = at25->chip.byte_len; in at25_probe()
505 at25->nvmem = devm_nvmem_register(&spi->dev, &at25->nvmem_config); in at25_probe()
506 if (IS_ERR(at25->nvmem)) in at25_probe()
507 return PTR_ERR(at25->nvmem); in at25_probe()
509 dev_info(&spi->dev, "%d %s %s %s%s, pagesize %u\n", in at25_probe()
510 (at25->chip.byte_len < 1024) ? in at25_probe()
511 at25->chip.byte_len : (at25->chip.byte_len / 1024), in at25_probe()
512 (at25->chip.byte_len < 1024) ? "Byte" : "KByte", in at25_probe()
513 at25->chip.name, is_fram ? "fram" : "eeprom", in at25_probe()
514 (at25->chip.flags & EE_READONLY) ? " (readonly)" : "", in at25_probe()
515 at25->chip.page_size); in at25_probe()
519 /*-------------------------------------------------------------------------*/