3  * at25.c -- support most SPI EEPROMs, such as Atmel AT25 models
26  * mean that some AT25 products are EEPROMs, and others are FLASH.
79 	struct at25_data *at25 = priv;  in at25_ee_read()  local
88 	if (unlikely(offset >= at25->chip.byte_len))  in at25_ee_read()
90 	if ((offset + count) > at25->chip.byte_len)  in at25_ee_read()
91 		count = at25->chip.byte_len - offset;  in at25_ee_read()
98 	if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR)  in at25_ee_read()
99 		if (offset >= (1U << (at25->addrlen * 8)))  in at25_ee_read()
104 	switch (at25->addrlen) {  in at25_ee_read()
120 	t[0].len = at25->addrlen + 1;  in at25_ee_read()
127 	mutex_lock(&at25->lock);  in at25_ee_read()
135 	status = spi_sync(at25->spi, &m);  in at25_ee_read()
136 	dev_dbg(&at25->spi->dev, "read %zu bytes at %d --> %zd\n",  in at25_ee_read()
139 	mutex_unlock(&at25->lock);  in at25_ee_read()
146 static int fm25_aux_read(struct at25_data *at25, u8 *buf, uint8_t command,  in fm25_aux_read()  argument
164 	mutex_lock(&at25->lock);  in fm25_aux_read()
166 	status = spi_sync(at25->spi, &m);  in fm25_aux_read()
167 	dev_dbg(&at25->spi->dev, "read %d aux bytes --> %d\n", len, status);  in fm25_aux_read()
169 	mutex_unlock(&at25->lock);  in fm25_aux_read()
175 	struct at25_data *at25;  in sernum_show()  local
177 	at25 = dev_get_drvdata(dev);  in sernum_show()
178 	return sysfs_emit(buf, "%*ph\n", (int)sizeof(at25->sernum), at25->sernum);  in sernum_show()
190 	struct at25_data *at25 = priv;  in at25_ee_write()  local
196 	if (unlikely(off >= at25->chip.byte_len))  in at25_ee_write()
198 	if ((off + count) > at25->chip.byte_len)  in at25_ee_write()
199 		count = at25->chip.byte_len - off;  in at25_ee_write()
204 	buf_size = at25->chip.page_size;  in at25_ee_write()
207 	bounce = kmalloc(buf_size + at25->addrlen + 1, GFP_KERNEL);  in at25_ee_write()
214 	mutex_lock(&at25->lock);  in at25_ee_write()
224 		status = spi_write(at25->spi, cp, 1);  in at25_ee_write()
226 			dev_dbg(&at25->spi->dev, "WREN --> %d\n", status);  in at25_ee_write()
231 		if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR)  in at25_ee_write()
232 			if (offset >= (1U << (at25->addrlen * 8)))  in at25_ee_write()
237 		switch (at25->addrlen) {  in at25_ee_write()
254 		status = spi_write(at25->spi, bounce,  in at25_ee_write()
255 				segment + at25->addrlen + 1);  in at25_ee_write()
256 		dev_dbg(&at25->spi->dev, "write %u bytes at %u --> %d\n",  in at25_ee_write()
270 			sr = spi_w8r8(at25->spi, AT25_RDSR);  in at25_ee_write()
272 				dev_dbg(&at25->spi->dev,  in at25_ee_write()
283 			dev_err(&at25->spi->dev,  in at25_ee_write()
298 	mutex_unlock(&at25->lock);  in at25_ee_write()
311 	strncpy(chip->name, "at25", sizeof(chip->name));  in at25_fw_to_chip()
314 	    device_property_read_u32(dev, "at25,byte-len", &val) == 0) {  in at25_fw_to_chip()
322 	    device_property_read_u32(dev, "at25,page-size", &val) == 0) {  in at25_fw_to_chip()
329 	if (device_property_read_u32(dev, "at25,addr-mode", &val) == 0) {  in at25_fw_to_chip()
363 	{ .compatible = "atmel,at25",},
370 	{ .name = "at25",},
378 	struct at25_data	*at25 = NULL;  in at25_probe()  local
412 	at25 = devm_kzalloc(&spi->dev, sizeof(struct at25_data), GFP_KERNEL);  in at25_probe()
413 	if (!at25)  in at25_probe()
416 	mutex_init(&at25->lock);  in at25_probe()
417 	at25->chip = chip;  in at25_probe()
418 	at25->spi = spi;  in at25_probe()
419 	spi_set_drvdata(spi, at25);  in at25_probe()
423 		fm25_aux_read(at25, id, FM25_RDID, FM25_ID_LEN);  in at25_probe()
436 		if (at25->chip.byte_len > 64 * 1024)  in at25_probe()
437 			at25->chip.flags |= EE_ADDR3;  in at25_probe()
439 			at25->chip.flags |= EE_ADDR2;  in at25_probe()
442 			fm25_aux_read(at25, sernum, FM25_RDSN, FM25_SN_LEN);  in at25_probe()
445 				at25->sernum[i] = sernum[FM25_SN_LEN - 1 - i];  in at25_probe()
448 		at25->chip.page_size = PAGE_SIZE;  in at25_probe()
449 		strncpy(at25->chip.name, "fm25", sizeof(at25->chip.name));  in at25_probe()
453 	if (at25->chip.flags & EE_ADDR1)  in at25_probe()
454 		at25->addrlen = 1;  in at25_probe()
455 	else if (at25->chip.flags & EE_ADDR2)  in at25_probe()
456 		at25->addrlen = 2;  in at25_probe()
457 	else if (at25->chip.flags & EE_ADDR3)  in at25_probe()
458 		at25->addrlen = 3;  in at25_probe()
464 	at25->nvmem_config.type = is_fram ? NVMEM_TYPE_FRAM : NVMEM_TYPE_EEPROM;  in at25_probe()
465 	at25->nvmem_config.name = dev_name(&spi->dev);  in at25_probe()
466 	at25->nvmem_config.dev = &spi->dev;  in at25_probe()
467 	at25->nvmem_config.read_only = chip.flags & EE_READONLY;  in at25_probe()
468 	at25->nvmem_config.root_only = true;  in at25_probe()
469 	at25->nvmem_config.owner = THIS_MODULE;  in at25_probe()
470 	at25->nvmem_config.compat = true;  in at25_probe()
471 	at25->nvmem_config.base_dev = &spi->dev;  in at25_probe()
472 	at25->nvmem_config.reg_read = at25_ee_read;  in at25_probe()
473 	at25->nvmem_config.reg_write = at25_ee_write;  in at25_probe()
474 	at25->nvmem_config.priv = at25;  in at25_probe()
475 	at25->nvmem_config.stride = 1;  in at25_probe()
476 	at25->nvmem_config.word_size = 1;  in at25_probe()
477 	at25->nvmem_config.size = chip.byte_len;  in at25_probe()
479 	at25->nvmem = devm_nvmem_register(&spi->dev, &at25->nvmem_config);  in at25_probe()
480 	if (IS_ERR(at25->nvmem))  in at25_probe()
481 		return PTR_ERR(at25->nvmem);  in at25_probe()
486 		 at25->chip.name, is_fram ? "fram" : "eeprom",  in at25_probe()
488 		 at25->chip.page_size);  in at25_probe()
496 		.name		= "at25",
509 MODULE_ALIAS("spi:at25");