1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2006-2007 PA Semi, Inc
35 static const char driver_name[] = "pasemi-nand";
37 static void pasemi_read_buf(struct nand_chip *chip, u_char *buf, int len)  in pasemi_read_buf()
40 		memcpy_fromio(buf, chip->legacy.IO_ADDR_R, 0x800);  in pasemi_read_buf()
42 		len -= 0x800;  in pasemi_read_buf()
44 	memcpy_fromio(buf, chip->legacy.IO_ADDR_R, len);  in pasemi_read_buf()
47 static void pasemi_write_buf(struct nand_chip *chip, const u_char *buf,  in pasemi_write_buf()
51 		memcpy_toio(chip->legacy.IO_ADDR_R, buf, 0x800);  in pasemi_write_buf()
53 		len -= 0x800;  in pasemi_write_buf()
55 	memcpy_toio(chip->legacy.IO_ADDR_R, buf, len);  in pasemi_write_buf()
58 static void pasemi_hwcontrol(struct nand_chip *chip, int cmd,  in pasemi_hwcontrol()
67 		out_8(chip->legacy.IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);  in pasemi_hwcontrol()
69 		out_8(chip->legacy.IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);  in pasemi_hwcontrol()
73 	inl(ddata->lpcctl);  in pasemi_hwcontrol()
76 static int pasemi_device_ready(struct nand_chip *chip)  in pasemi_device_ready()
80 	return !!(inl(ddata->lpcctl) & LBICTRL_LPCCTL_NR);  in pasemi_device_ready()
83 static int pasemi_attach_chip(struct nand_chip *chip)  in pasemi_attach_chip()
85 	if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT &&  in pasemi_attach_chip()
86 	    chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)  in pasemi_attach_chip()
87 		chip->ecc.algo = NAND_ECC_ALGO_HAMMING;  in pasemi_attach_chip()
92 static const struct nand_controller_ops pasemi_ops = {
96 static int pasemi_nand_probe(struct platform_device *ofdev)  in pasemi_nand_probe()
98 	struct device *dev = &ofdev->dev;  in pasemi_nand_probe()
100 	struct device_node *np = dev->of_node;  in pasemi_nand_probe()
111 		return -EINVAL;  in pasemi_nand_probe()
118 		err = -ENOMEM;  in pasemi_nand_probe()
122 	chip = &ddata->chip;  in pasemi_nand_probe()
123 	controller = &ddata->controller;  in pasemi_nand_probe()
125 	controller->ops = &pasemi_ops;  in pasemi_nand_probe()
127 	chip->controller = controller;  in pasemi_nand_probe()
132 	pasemi_nand_mtd->dev.parent = dev;  in pasemi_nand_probe()
134 	chip->legacy.IO_ADDR_R = of_iomap(np, 0);  in pasemi_nand_probe()
135 	chip->legacy.IO_ADDR_W = chip->legacy.IO_ADDR_R;  in pasemi_nand_probe()
137 	if (!chip->legacy.IO_ADDR_R) {  in pasemi_nand_probe()
138 		err = -EIO;  in pasemi_nand_probe()
144 		err = -ENODEV;  in pasemi_nand_probe()
148 	ddata->lpcctl = pci_resource_start(pdev, 0);  in pasemi_nand_probe()
151 	if (!request_region(ddata->lpcctl, 4, driver_name)) {  in pasemi_nand_probe()
152 		err = -EBUSY;  in pasemi_nand_probe()
156 	chip->legacy.cmd_ctrl = pasemi_hwcontrol;  in pasemi_nand_probe()
157 	chip->legacy.dev_ready = pasemi_device_ready;  in pasemi_nand_probe()
158 	chip->legacy.read_buf = pasemi_read_buf;  in pasemi_nand_probe()
159 	chip->legacy.write_buf = pasemi_write_buf;  in pasemi_nand_probe()
160 	chip->legacy.chip_delay = 0;  in pasemi_nand_probe()
163 	chip->bbt_options = NAND_BBT_USE_FLASH;  in pasemi_nand_probe()
167 	 * Set ->engine_type before registering the NAND devices in order to  in pasemi_nand_probe()
170 	chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;  in pasemi_nand_probe()
179 		err = -ENODEV;  in pasemi_nand_probe()
183 	dev_info(dev, "PA Semi NAND flash at %pR, control at I/O %x\n", &res,  in pasemi_nand_probe()
184 		 ddata->lpcctl);  in pasemi_nand_probe()
191 	release_region(ddata->lpcctl, 4);  in pasemi_nand_probe()
193 	iounmap(chip->legacy.IO_ADDR_R);  in pasemi_nand_probe()
200 static void pasemi_nand_remove(struct platform_device *ofdev)  in pasemi_nand_remove()
207 	chip = &ddata->chip;  in pasemi_nand_remove()
215 	release_region(ddata->lpcctl, 4);  in pasemi_nand_remove()
217 	iounmap(chip->legacy.IO_ADDR_R);  in pasemi_nand_remove()
223 static const struct of_device_id pasemi_nand_match[] =
226 		.compatible   = "pasemi,localbus-nand",
233 static struct platform_driver pasemi_nand_driver =
247 MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");