blob: 7f2da6953357f80f06bfab9404d411db53f6ef05 [file] [log] [blame]
Vitaly Wool711fdf62007-05-06 19:31:18 +04001/*
2 * Generic NAND driver
3 *
4 * Author: Vitaly Wool <vitalywool@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12#include <linux/io.h>
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/slab.h>
16#include <linux/mtd/mtd.h>
17#include <linux/mtd/nand.h>
18#include <linux/mtd/partitions.h>
19
20struct plat_nand_data {
21 struct nand_chip chip;
22 struct mtd_info mtd;
23 void __iomem *io_base;
Vitaly Wool711fdf62007-05-06 19:31:18 +040024};
25
26/*
27 * Probe for the NAND device.
28 */
Uwe Kleine-König9d632872009-03-28 00:26:58 +010029static int __devinit plat_nand_probe(struct platform_device *pdev)
Vitaly Wool711fdf62007-05-06 19:31:18 +040030{
31 struct platform_nand_data *pdata = pdev->dev.platform_data;
32 struct plat_nand_data *data;
H Hartley Sweeten2d098a72009-10-19 19:45:29 -040033 struct resource *res;
34 int err = 0;
35
Marek Vasut01cd2aba2010-08-12 03:53:55 +010036 if (pdata->chip.nr_chips < 1) {
37 dev_err(&pdev->dev, "invalid number of chips specified\n");
38 return -EINVAL;
39 }
40
H Hartley Sweeten2d098a72009-10-19 19:45:29 -040041 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
42 if (!res)
43 return -ENXIO;
Vitaly Wool711fdf62007-05-06 19:31:18 +040044
45 /* Allocate memory for the device structure (and zero it) */
46 data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
47 if (!data) {
48 dev_err(&pdev->dev, "failed to allocate device structure.\n");
49 return -ENOMEM;
50 }
51
H Hartley Sweeten2d098a72009-10-19 19:45:29 -040052 if (!request_mem_region(res->start, resource_size(res),
53 dev_name(&pdev->dev))) {
54 dev_err(&pdev->dev, "request_mem_region failed\n");
55 err = -EBUSY;
56 goto out_free;
57 }
58
59 data->io_base = ioremap(res->start, resource_size(res));
Vitaly Wool711fdf62007-05-06 19:31:18 +040060 if (data->io_base == NULL) {
61 dev_err(&pdev->dev, "ioremap failed\n");
H Hartley Sweeten2d098a72009-10-19 19:45:29 -040062 err = -EIO;
63 goto out_release_io;
Vitaly Wool711fdf62007-05-06 19:31:18 +040064 }
65
66 data->chip.priv = &data;
67 data->mtd.priv = &data->chip;
68 data->mtd.owner = THIS_MODULE;
Kay Sievers475b44c2009-01-06 10:44:38 -080069 data->mtd.name = dev_name(&pdev->dev);
Vitaly Wool711fdf62007-05-06 19:31:18 +040070
71 data->chip.IO_ADDR_R = data->io_base;
72 data->chip.IO_ADDR_W = data->io_base;
73 data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
74 data->chip.dev_ready = pdata->ctrl.dev_ready;
75 data->chip.select_chip = pdata->ctrl.select_chip;
Alexander Clouterd6fed9e2009-05-11 19:28:01 +010076 data->chip.write_buf = pdata->ctrl.write_buf;
77 data->chip.read_buf = pdata->ctrl.read_buf;
Vitaly Wool711fdf62007-05-06 19:31:18 +040078 data->chip.chip_delay = pdata->chip.chip_delay;
79 data->chip.options |= pdata->chip.options;
Brian Norrisa40f7342011-05-31 16:31:22 -070080 data->chip.bbt_options |= pdata->chip.bbt_options;
Vitaly Wool711fdf62007-05-06 19:31:18 +040081
82 data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
83 data->chip.ecc.layout = pdata->chip.ecclayout;
84 data->chip.ecc.mode = NAND_ECC_SOFT;
85
86 platform_set_drvdata(pdev, data);
87
H Hartley Sweetenbf95efd2009-05-12 13:46:58 -070088 /* Handle any platform specific setup */
89 if (pdata->ctrl.probe) {
H Hartley Sweeten2d098a72009-10-19 19:45:29 -040090 err = pdata->ctrl.probe(pdev);
91 if (err)
H Hartley Sweetenbf95efd2009-05-12 13:46:58 -070092 goto out;
93 }
94
Lucas De Marchi25985ed2011-03-30 22:57:33 -030095 /* Scan to find existence of the device */
Marek Vasut81cbb0b2010-07-28 07:36:54 +020096 if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
H Hartley Sweeten2d098a72009-10-19 19:45:29 -040097 err = -ENXIO;
Vitaly Wool711fdf62007-05-06 19:31:18 +040098 goto out;
99 }
100
Dmitry Eremin-Solenikov009c8402011-06-02 18:00:57 +0400101 err = mtd_device_parse_register(&data->mtd,
102 pdata->chip.part_probe_types, 0,
103 pdata->chip.partitions, pdata->chip.nr_partitions);
Vitaly Wool711fdf62007-05-06 19:31:18 +0400104
H Hartley Sweeten2d098a72009-10-19 19:45:29 -0400105 if (!err)
106 return err;
Vitaly Wool711fdf62007-05-06 19:31:18 +0400107
108 nand_release(&data->mtd);
109out:
H Hartley Sweetenbf95efd2009-05-12 13:46:58 -0700110 if (pdata->ctrl.remove)
111 pdata->ctrl.remove(pdev);
Vitaly Wool711fdf62007-05-06 19:31:18 +0400112 platform_set_drvdata(pdev, NULL);
113 iounmap(data->io_base);
H Hartley Sweeten2d098a72009-10-19 19:45:29 -0400114out_release_io:
115 release_mem_region(res->start, resource_size(res));
116out_free:
Vitaly Wool711fdf62007-05-06 19:31:18 +0400117 kfree(data);
H Hartley Sweeten2d098a72009-10-19 19:45:29 -0400118 return err;
Vitaly Wool711fdf62007-05-06 19:31:18 +0400119}
120
121/*
122 * Remove a NAND device.
123 */
124static int __devexit plat_nand_remove(struct platform_device *pdev)
125{
126 struct plat_nand_data *data = platform_get_drvdata(pdev);
127 struct platform_nand_data *pdata = pdev->dev.platform_data;
H Hartley Sweeten2d098a72009-10-19 19:45:29 -0400128 struct resource *res;
129
130 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Vitaly Wool711fdf62007-05-06 19:31:18 +0400131
132 nand_release(&data->mtd);
H Hartley Sweetenbf95efd2009-05-12 13:46:58 -0700133 if (pdata->ctrl.remove)
134 pdata->ctrl.remove(pdev);
Vitaly Wool711fdf62007-05-06 19:31:18 +0400135 iounmap(data->io_base);
H Hartley Sweeten2d098a72009-10-19 19:45:29 -0400136 release_mem_region(res->start, resource_size(res));
Vitaly Wool711fdf62007-05-06 19:31:18 +0400137 kfree(data);
138
139 return 0;
140}
141
142static struct platform_driver plat_nand_driver = {
143 .probe = plat_nand_probe,
Thomas Chou24b5ce22009-04-21 12:27:34 +0800144 .remove = __devexit_p(plat_nand_remove),
Vitaly Wool711fdf62007-05-06 19:31:18 +0400145 .driver = {
146 .name = "gen_nand",
147 .owner = THIS_MODULE,
148 },
149};
150
Axel Linf99640d2011-11-27 20:45:03 +0800151module_platform_driver(plat_nand_driver);
Vitaly Wool711fdf62007-05-06 19:31:18 +0400152
153MODULE_LICENSE("GPL");
154MODULE_AUTHOR("Vitaly Wool");
155MODULE_DESCRIPTION("Simple generic NAND driver");
Kay Sievers1ff18422008-04-18 13:44:27 -0700156MODULE_ALIAS("platform:gen_nand");