4  * Driver for SST25L SPI Flash chips
29 #include <linux/spi/flash.h>
71 static int sst25l_status(struct sst25l_flash *flash, int *status)  in sst25l_status()  argument
87 	err = spi_sync(flash->spi, &m);  in sst25l_status()
95 static int sst25l_write_enable(struct sst25l_flash *flash, int enable)  in sst25l_write_enable()  argument
101 	err = spi_write(flash->spi, command, 1);  in sst25l_write_enable()
106 	err = spi_write(flash->spi, command, 1);  in sst25l_write_enable()
112 	err = spi_write(flash->spi, command, 2);  in sst25l_write_enable()
117 		err = sst25l_status(flash, &status);  in sst25l_write_enable()
127 static int sst25l_wait_till_ready(struct sst25l_flash *flash)  in sst25l_wait_till_ready()  argument
134 		err = sst25l_status(flash, &status);  in sst25l_wait_till_ready()
146 static int sst25l_erase_sector(struct sst25l_flash *flash, uint32_t offset)  in sst25l_erase_sector()  argument
151 	err = sst25l_write_enable(flash, 1);  in sst25l_erase_sector()
159 	err = spi_write(flash->spi, command, 4);  in sst25l_erase_sector()
163 	err = sst25l_wait_till_ready(flash);  in sst25l_erase_sector()
167 	return sst25l_write_enable(flash, 0);  in sst25l_erase_sector()
172 	struct sst25l_flash *flash = to_sst25l_flash(mtd);  in sst25l_erase()  local
186 	mutex_lock(&flash->lock);  in sst25l_erase()
188 	err = sst25l_wait_till_ready(flash);  in sst25l_erase()
190 		mutex_unlock(&flash->lock);  in sst25l_erase()
195 		err = sst25l_erase_sector(flash, addr);  in sst25l_erase()
197 			mutex_unlock(&flash->lock);  in sst25l_erase()
198 			dev_err(&flash->spi->dev, "Erase failed\n");  in sst25l_erase()
205 	mutex_unlock(&flash->lock);  in sst25l_erase()
213 	struct sst25l_flash *flash = to_sst25l_flash(mtd);  in sst25l_read()  local
235 	mutex_lock(&flash->lock);  in sst25l_read()
238 	ret = sst25l_wait_till_ready(flash);  in sst25l_read()
240 		mutex_unlock(&flash->lock);  in sst25l_read()
244 	spi_sync(flash->spi, &message);  in sst25l_read()
249 	mutex_unlock(&flash->lock);  in sst25l_read()
256 	struct sst25l_flash *flash = to_sst25l_flash(mtd);  in sst25l_write()  local
263 	mutex_lock(&flash->lock);  in sst25l_write()
265 	ret = sst25l_write_enable(flash, 1);  in sst25l_write()
270 		ret = sst25l_wait_till_ready(flash);  in sst25l_write()
280 		ret = spi_write(flash->spi, command, 5);  in sst25l_write()
291 			ret = sst25l_wait_till_ready(flash);  in sst25l_write()
296 			ret = spi_write(flash->spi, command, 2);  in sst25l_write()
303 	ret = sst25l_write_enable(flash, 0);  in sst25l_write()
308 	mutex_unlock(&flash->lock);  in sst25l_write()
355 	struct sst25l_flash *flash;  in sst25l_probe()  local
363 	flash = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL);  in sst25l_probe()
364 	if (!flash)  in sst25l_probe()
367 	flash->spi = spi;  in sst25l_probe()
368 	mutex_init(&flash->lock);  in sst25l_probe()
369 	spi_set_drvdata(spi, flash);  in sst25l_probe()
373 		flash->mtd.name = data->name;  in sst25l_probe()
375 	flash->mtd.dev.parent   = &spi->dev;  in sst25l_probe()
376 	flash->mtd.type		= MTD_NORFLASH;  in sst25l_probe()
377 	flash->mtd.flags	= MTD_CAP_NORFLASH;  in sst25l_probe()
378 	flash->mtd.erasesize	= flash_info->erase_size;  in sst25l_probe()
379 	flash->mtd.writesize	= flash_info->page_size;  in sst25l_probe()
380 	flash->mtd.writebufsize	= flash_info->page_size;  in sst25l_probe()
381 	flash->mtd.size		= flash_info->page_size * flash_info->nr_pages;  in sst25l_probe()
382 	flash->mtd._erase	= sst25l_erase;  in sst25l_probe()
383 	flash->mtd._read		= sst25l_read;  in sst25l_probe()
384 	flash->mtd._write 	= sst25l_write;  in sst25l_probe()
387 		 (long long)flash->mtd.size >> 10);  in sst25l_probe()
391 	      flash->mtd.name,  in sst25l_probe()
392 	      (long long)flash->mtd.size, (long long)(flash->mtd.size >> 20),  in sst25l_probe()
393 	      flash->mtd.erasesize, flash->mtd.erasesize / 1024,  in sst25l_probe()
394 	      flash->mtd.numeraseregions);  in sst25l_probe()
397 	ret = mtd_device_register(&flash->mtd, data ? data->parts : NULL,  in sst25l_probe()
407 	struct sst25l_flash *flash = spi_get_drvdata(spi);  in sst25l_remove()  local
409 	return mtd_device_unregister(&flash->mtd);  in sst25l_remove()
422 MODULE_DESCRIPTION("MTD SPI driver for SST25L Flash chips");