23 #include <linux/spi/flash.h>
61 static int mchp48l640_mkcmd(struct mchp48l640_flash *flash, u8 cmd, loff_t addr, char *buf)  in mchp48l640_mkcmd()  argument
70 static int mchp48l640_read_status(struct mchp48l640_flash *flash, int *status)  in mchp48l640_read_status()  argument
77 	mutex_lock(&flash->lock);  in mchp48l640_read_status()
78 	ret = spi_write_then_read(flash->spi, &cmd[0], 1, &cmd[1], 1);  in mchp48l640_read_status()
79 	mutex_unlock(&flash->lock);  in mchp48l640_read_status()
82 	dev_dbg(&flash->spi->dev, "read status ret: %d status: %x", ret, *status);  in mchp48l640_read_status()
87 static int mchp48l640_waitforbit(struct mchp48l640_flash *flash, int bit, bool set)  in mchp48l640_waitforbit()  argument
94 		ret = mchp48l640_read_status(flash, &status);  in mchp48l640_waitforbit()
95 		dev_dbg(&flash->spi->dev, "read status ret: %d bit: %x %sset status: %x",  in mchp48l640_waitforbit()
111 	dev_err(&flash->spi->dev, "Timeout waiting for bit %x %s set in status register.",  in mchp48l640_waitforbit()
116 static int mchp48l640_write_prepare(struct mchp48l640_flash *flash, bool enable)  in mchp48l640_write_prepare()  argument
126 	mutex_lock(&flash->lock);  in mchp48l640_write_prepare()
127 	ret = spi_write(flash->spi, cmd, 1);  in mchp48l640_write_prepare()
128 	mutex_unlock(&flash->lock);  in mchp48l640_write_prepare()
131 		dev_err(&flash->spi->dev, "write %sable failed ret: %d",  in mchp48l640_write_prepare()
134 	dev_dbg(&flash->spi->dev, "write %sable success ret: %d",  in mchp48l640_write_prepare()
137 		return mchp48l640_waitforbit(flash, MCHP48L640_STATUS_WEL, true);  in mchp48l640_write_prepare()
142 static int mchp48l640_set_mode(struct mchp48l640_flash *flash)  in mchp48l640_set_mode()  argument
147 	ret = mchp48l640_write_prepare(flash, true);  in mchp48l640_set_mode()
154 	mutex_lock(&flash->lock);  in mchp48l640_set_mode()
155 	ret = spi_write(flash->spi, cmd, 2);  in mchp48l640_set_mode()
156 	mutex_unlock(&flash->lock);  in mchp48l640_set_mode()
158 		dev_err(&flash->spi->dev, "Could not set continuous mode ret: %d", ret);  in mchp48l640_set_mode()
160 	return mchp48l640_waitforbit(flash, MCHP48L640_STATUS_PRO, true);  in mchp48l640_set_mode()
163 static int mchp48l640_wait_rdy(struct mchp48l640_flash *flash)  in mchp48l640_wait_rdy()  argument
165 	return mchp48l640_waitforbit(flash, MCHP48L640_STATUS_RDY, false);  in mchp48l640_wait_rdy()
171 	struct mchp48l640_flash *flash = to_mchp48l640_flash(mtd);  in mchp48l640_write_page()  local
180 	ret = mchp48l640_wait_rdy(flash);  in mchp48l640_write_page()
184 	ret = mchp48l640_write_prepare(flash, true);  in mchp48l640_write_page()
188 	mutex_lock(&flash->lock);  in mchp48l640_write_page()
189 	cmdlen = mchp48l640_mkcmd(flash, MCHP48L640_CMD_WRITE, to, cmd);  in mchp48l640_write_page()
191 	ret = spi_write(flash->spi, cmd, cmdlen + len);  in mchp48l640_write_page()
192 	mutex_unlock(&flash->lock);  in mchp48l640_write_page()
198 	if (flash->caps->auto_disable_wel) {  in mchp48l640_write_page()
199 		ret = mchp48l640_waitforbit(flash, MCHP48L640_STATUS_WEL, false);  in mchp48l640_write_page()
203 		ret = mchp48l640_write_prepare(flash, false);  in mchp48l640_write_page()
212 	dev_err(&flash->spi->dev, "write fail with: %d", ret);  in mchp48l640_write_page()
219 	struct mchp48l640_flash *flash = to_mchp48l640_flash(mtd);  in mchp48l640_write()  local
224 	size_t page_sz = flash->caps->page_size;  in mchp48l640_write()
245 	struct mchp48l640_flash *flash = to_mchp48l640_flash(mtd);  in mchp48l640_read_page()  local
254 	ret = mchp48l640_wait_rdy(flash);  in mchp48l640_read_page()
258 	mutex_lock(&flash->lock);  in mchp48l640_read_page()
259 	cmdlen = mchp48l640_mkcmd(flash, MCHP48L640_CMD_READ, from, cmd);  in mchp48l640_read_page()
260 	ret = spi_write_then_read(flash->spi, cmd, cmdlen, buf, len);  in mchp48l640_read_page()
261 	mutex_unlock(&flash->lock);  in mchp48l640_read_page()
270 	dev_err(&flash->spi->dev, "read fail with: %d", ret);  in mchp48l640_read_page()
277 	struct mchp48l640_flash *flash = to_mchp48l640_flash(mtd);  in mchp48l640_read()  local
282 	size_t page_sz = flash->caps->page_size;  in mchp48l640_read()
314 	struct mchp48l640_flash *flash;  in mchp48l640_probe()  local
319 	flash = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL);  in mchp48l640_probe()
320 	if (!flash)  in mchp48l640_probe()
323 	flash->spi = spi;  in mchp48l640_probe()
324 	mutex_init(&flash->lock);  in mchp48l640_probe()
325 	spi_set_drvdata(spi, flash);  in mchp48l640_probe()
327 	err = mchp48l640_read_status(flash, &status);  in mchp48l640_probe()
331 	err = mchp48l640_set_mode(flash);  in mchp48l640_probe()
337 	flash->caps = of_device_get_match_data(&spi->dev);  in mchp48l640_probe()
338 	if (!flash->caps)  in mchp48l640_probe()
339 		flash->caps = &mchp48l640_caps;  in mchp48l640_probe()
341 	mtd_set_of_node(&flash->mtd, spi->dev.of_node);  in mchp48l640_probe()
342 	flash->mtd.dev.parent	= &spi->dev;  in mchp48l640_probe()
343 	flash->mtd.type		= MTD_RAM;  in mchp48l640_probe()
344 	flash->mtd.flags	= MTD_CAP_RAM;  in mchp48l640_probe()
345 	flash->mtd.writesize	= flash->caps->page_size;  in mchp48l640_probe()
346 	flash->mtd.size		= flash->caps->size;  in mchp48l640_probe()
347 	flash->mtd._read	= mchp48l640_read;  in mchp48l640_probe()
348 	flash->mtd._write	= mchp48l640_write;  in mchp48l640_probe()
350 	err = mtd_device_register(&flash->mtd, data ? data->parts : NULL,  in mchp48l640_probe()
360 	struct mchp48l640_flash *flash = spi_get_drvdata(spi);  in mchp48l640_remove()  local
362 	WARN_ON(mtd_device_unregister(&flash->mtd));  in mchp48l640_remove()