2 * drivers/mtd/nand/omap-nand-flash.c
4 * Copyright (c) 2004 Texas Instruments, Jian Zhang <jzhang@ti.com>
5 * Copyright (c) 2004 David Brownell
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/init.h>
13 #include <linux/ioport.h>
14 #include <linux/delay.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/types.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/nand.h>
21 #include <linux/mtd/partitions.h>
24 #include <mach/hardware.h>
25 #include <asm/mach-types.h>
26 #include <asm/mach/flash.h>
29 #include <mach/nand.h>
31 #define DRIVER_NAME "omapnand"
33 #ifdef CONFIG_MTD_PARTITIONS
34 static const char *part_probes[] = { "cmdlinepart", NULL };
37 struct omap_nand_info {
38 struct omap_nand_platform_data *pdata;
39 struct mtd_partition *parts;
41 struct nand_chip nand;
45 * hardware specific access to control-lines
46 * NOTE: boards may use different bits for these!!
49 * NAND_NCE: bit 0 - don't care
50 * NAND_CLE: bit 1 -> bit 1 (0x0002)
51 * NAND_ALE: bit 2 -> bit 2 (0x0004)
54 static void omap_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
56 struct nand_chip *chip = mtd->priv;
59 if (cmd == NAND_CMD_NONE)
62 mask = (ctrl & NAND_CLE) ? 0x02 : 0;
65 writeb(cmd, (unsigned long)chip->IO_ADDR_W | mask);
68 static int omap_nand_dev_ready(struct mtd_info *mtd)
70 struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, mtd);
72 return info->pdata->dev_ready(info->pdata);
75 static int __devinit omap_nand_probe(struct platform_device *pdev)
77 struct omap_nand_info *info;
78 struct omap_nand_platform_data *pdata = pdev->dev.platform_data;
79 struct resource *res = pdev->resource;
80 unsigned long size = res->end - res->start + 1;
83 info = kzalloc(sizeof(struct omap_nand_info), GFP_KERNEL);
87 if (!request_mem_region(res->start, size, pdev->dev.driver->name)) {
92 info->nand.IO_ADDR_R = ioremap(res->start, size);
93 if (!info->nand.IO_ADDR_R) {
95 goto out_release_mem_region;
97 info->nand.IO_ADDR_W = info->nand.IO_ADDR_R;
98 info->nand.cmd_ctrl = omap_nand_hwcontrol;
99 info->nand.ecc.mode = NAND_ECC_SOFT;
100 info->nand.options = pdata->options;
101 if (pdata->dev_ready)
102 info->nand.dev_ready = omap_nand_dev_ready;
104 info->nand.chip_delay = 20;
106 info->mtd.name = dev_name(&pdev->dev);
107 info->mtd.priv = &info->nand;
111 /* DIP switches on H2 and some other boards change between 8 and 16 bit
112 * bus widths for flash. Try the other width if the first try fails.
114 if (nand_scan(&info->mtd, 1)) {
115 info->nand.options ^= NAND_BUSWIDTH_16;
116 if (nand_scan(&info->mtd, 1)) {
121 info->mtd.owner = THIS_MODULE;
123 #ifdef CONFIG_MTD_PARTITIONS
124 err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
126 add_mtd_partitions(&info->mtd, info->parts, err);
127 else if (err < 0 && pdata->parts)
128 add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
131 add_mtd_device(&info->mtd);
133 platform_set_drvdata(pdev, info);
138 iounmap(info->nand.IO_ADDR_R);
139 out_release_mem_region:
140 release_mem_region(res->start, size);
147 static int omap_nand_remove(struct platform_device *pdev)
149 struct omap_nand_info *info = platform_get_drvdata(pdev);
151 platform_set_drvdata(pdev, NULL);
152 /* Release NAND device, its internal structures and partitions */
153 nand_release(&info->mtd);
154 iounmap(info->nand.IO_ADDR_R);
159 static struct platform_driver omap_nand_driver = {
160 .probe = omap_nand_probe,
161 .remove = omap_nand_remove,
166 MODULE_ALIAS(DRIVER_NAME);
168 static int __init omap_nand_init(void)
170 return platform_driver_register(&omap_nand_driver);
173 static void __exit omap_nand_exit(void)
175 platform_driver_unregister(&omap_nand_driver);
178 module_init(omap_nand_init);
179 module_exit(omap_nand_exit);
181 MODULE_LICENSE("GPL");
182 MODULE_AUTHOR("Jian Zhang <jzhang@ti.com> (and others)");
183 MODULE_DESCRIPTION("Glue layer for NAND flash on TI OMAP boards");