1 // SPDX-License-Identifier: GPL-2.0-only
32  * socrates_nand_write_buf -  write buffer to chip
33  * @this:	NAND chip object
44 		out_be32(host->io_base, FPGA_NAND_ENABLE |  in socrates_nand_write_buf()
51  * socrates_nand_read_buf -  read chip data into buffer
52  * @this:	NAND chip object
65 	out_be32(host->io_base, val);  in socrates_nand_read_buf()
67 		buf[i] = (in_be32(host->io_base) >>  in socrates_nand_read_buf()
73  * socrates_nand_read_byte -  read one byte from the chip
84  * Hardware specific access to control-lines
105 	out_be32(host->io_base, val);  in socrates_nand_cmd_ctrl()
115 	if (in_be32(host->io_base) & FPGA_NAND_BUSY)  in socrates_nand_device_ready()
122 	if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT &&  in socrates_attach_chip()
123 	    chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)  in socrates_attach_chip()
124 		chip->ecc.algo = NAND_ECC_ALGO_HAMMING;  in socrates_attach_chip()
134  * Probe for the NAND device.
144 	host = devm_kzalloc(&ofdev->dev, sizeof(*host), GFP_KERNEL);  in socrates_nand_probe()
146 		return -ENOMEM;  in socrates_nand_probe()
148 	host->io_base = of_iomap(ofdev->dev.of_node, 0);  in socrates_nand_probe()
149 	if (host->io_base == NULL) {  in socrates_nand_probe()
150 		dev_err(&ofdev->dev, "ioremap failed\n");  in socrates_nand_probe()
151 		return -EIO;  in socrates_nand_probe()
154 	nand_chip = &host->nand_chip;  in socrates_nand_probe()
156 	host->dev = &ofdev->dev;  in socrates_nand_probe()
158 	nand_controller_init(&host->controller);  in socrates_nand_probe()
159 	host->controller.ops = &socrates_ops;  in socrates_nand_probe()
160 	nand_chip->controller = &host->controller;  in socrates_nand_probe()
164 	nand_set_flash_node(nand_chip, ofdev->dev.of_node);  in socrates_nand_probe()
165 	mtd->name = "socrates_nand";  in socrates_nand_probe()
166 	mtd->dev.parent = &ofdev->dev;  in socrates_nand_probe()
168 	nand_chip->legacy.cmd_ctrl = socrates_nand_cmd_ctrl;  in socrates_nand_probe()
169 	nand_chip->legacy.read_byte = socrates_nand_read_byte;  in socrates_nand_probe()
170 	nand_chip->legacy.write_buf = socrates_nand_write_buf;  in socrates_nand_probe()
171 	nand_chip->legacy.read_buf = socrates_nand_read_buf;  in socrates_nand_probe()
172 	nand_chip->legacy.dev_ready = socrates_nand_device_ready;  in socrates_nand_probe()
175 	nand_chip->legacy.chip_delay = 20;	/* 20us command delay time */  in socrates_nand_probe()
178 	 * This driver assumes that the default ECC engine should be TYPE_SOFT.  in socrates_nand_probe()
179 	 * Set ->engine_type before registering the NAND devices in order to  in socrates_nand_probe()
182 	nand_chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;  in socrates_nand_probe()
184 	dev_set_drvdata(&ofdev->dev, host);  in socrates_nand_probe()
197 	iounmap(host->io_base);  in socrates_nand_probe()
202  * Remove a NAND device.
206 	struct socrates_nand_host *host = dev_get_drvdata(&ofdev->dev);  in socrates_nand_remove()
207 	struct nand_chip *chip = &host->nand_chip;  in socrates_nand_remove()
214 	iounmap(host->io_base);  in socrates_nand_remove()
222 		.compatible   = "abb,socrates-nand",
242 MODULE_DESCRIPTION("NAND driver for Socrates board");