1 // SPDX-License-Identifier: GPL-2.0-only
3  * Oxford Semiconductor OXNAS NAND driver
24 /* Nand commands */
31 	struct nand_controller base;  member
35 	unsigned int nchips;
42 	return readb(oxnas->io_base);  in oxnas_nand_read_byte()
45 static void oxnas_nand_read_buf(struct nand_chip *chip, u8 *buf, int len)  in oxnas_nand_read_buf()
49 	ioread8_rep(oxnas->io_base, buf, len);  in oxnas_nand_read_buf()
53 				 int len)  in oxnas_nand_write_buf()
57 	iowrite8_rep(oxnas->io_base, buf, len);  in oxnas_nand_write_buf()
61 static void oxnas_nand_cmd_ctrl(struct nand_chip *chip, int cmd,  in oxnas_nand_cmd_ctrl()
62 				unsigned int ctrl)  in oxnas_nand_cmd_ctrl()
67 		writeb(cmd, oxnas->io_base + OXNAS_NAND_CMD_CLE);  in oxnas_nand_cmd_ctrl()
69 		writeb(cmd, oxnas->io_base + OXNAS_NAND_CMD_ALE);  in oxnas_nand_cmd_ctrl()
73  * Probe for the NAND device.
75 static int oxnas_nand_probe(struct platform_device *pdev)  in oxnas_nand_probe()
77 	struct device_node *np = pdev->dev.of_node;  in oxnas_nand_probe()
82 	int count = 0;  in oxnas_nand_probe()
83 	int err = 0;  in oxnas_nand_probe()
84 	int i;  in oxnas_nand_probe()
87 	oxnas = devm_kzalloc(&pdev->dev, sizeof(*oxnas),  in oxnas_nand_probe()
90 		return -ENOMEM;  in oxnas_nand_probe()
92 	nand_controller_init(&oxnas->base);  in oxnas_nand_probe()
94 	oxnas->io_base = devm_platform_ioremap_resource(pdev, 0);  in oxnas_nand_probe()
95 	if (IS_ERR(oxnas->io_base))  in oxnas_nand_probe()
96 		return PTR_ERR(oxnas->io_base);  in oxnas_nand_probe()
98 	oxnas->clk = devm_clk_get(&pdev->dev, NULL);  in oxnas_nand_probe()
99 	if (IS_ERR(oxnas->clk))  in oxnas_nand_probe()
100 		oxnas->clk = NULL;  in oxnas_nand_probe()
105 		return -EINVAL;  in oxnas_nand_probe()
107 	err = clk_prepare_enable(oxnas->clk);  in oxnas_nand_probe()
111 	device_reset_optional(&pdev->dev);  in oxnas_nand_probe()
114 		chip = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip),  in oxnas_nand_probe()
117 			err = -ENOMEM;  in oxnas_nand_probe()
121 		chip->controller = &oxnas->base;  in oxnas_nand_probe()
127 		mtd->dev.parent = &pdev->dev;  in oxnas_nand_probe()
128 		mtd->priv = chip;  in oxnas_nand_probe()
130 		chip->legacy.cmd_ctrl = oxnas_nand_cmd_ctrl;  in oxnas_nand_probe()
131 		chip->legacy.read_buf = oxnas_nand_read_buf;  in oxnas_nand_probe()
132 		chip->legacy.read_byte = oxnas_nand_read_byte;  in oxnas_nand_probe()
133 		chip->legacy.write_buf = oxnas_nand_write_buf;  in oxnas_nand_probe()
134 		chip->legacy.chip_delay = 30;  in oxnas_nand_probe()
145 		oxnas->chips[oxnas->nchips++] = chip;  in oxnas_nand_probe()
149 	if (!oxnas->nchips) {  in oxnas_nand_probe()
150 		err = -ENODEV;  in oxnas_nand_probe()
163 	for (i = 0; i < oxnas->nchips; i++) {  in oxnas_nand_probe()
164 		chip = oxnas->chips[i];  in oxnas_nand_probe()
170 	clk_disable_unprepare(oxnas->clk);  in oxnas_nand_probe()
174 static int oxnas_nand_remove(struct platform_device *pdev)  in oxnas_nand_remove()
178 	int i;  in oxnas_nand_remove()
180 	for (i = 0; i < oxnas->nchips; i++) {  in oxnas_nand_remove()
181 		chip = oxnas->chips[i];  in oxnas_nand_remove()
186 	clk_disable_unprepare(oxnas->clk);  in oxnas_nand_remove()
192 	{ .compatible = "oxsemi,ox820-nand" },
210 MODULE_DESCRIPTION("Oxnas NAND driver");