4 * Author: Vitaly Wool <vitalywool@gmail.com>
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.
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>
20 struct plat_nand_data {
21 struct nand_chip chip;
23 void __iomem *io_base;
26 static const char *part_probe_types[] = { "cmdlinepart", NULL };
29 * Probe for the NAND device.
31 static int __devinit plat_nand_probe(struct platform_device *pdev)
33 struct platform_nand_data *pdata = pdev->dev.platform_data;
34 struct mtd_part_parser_data ppdata;
35 struct plat_nand_data *data;
37 const char **part_types;
40 if (pdata->chip.nr_chips < 1) {
41 dev_err(&pdev->dev, "invalid number of chips specified\n");
45 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
49 /* Allocate memory for the device structure (and zero it) */
50 data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
52 dev_err(&pdev->dev, "failed to allocate device structure.\n");
56 if (!request_mem_region(res->start, resource_size(res),
57 dev_name(&pdev->dev))) {
58 dev_err(&pdev->dev, "request_mem_region failed\n");
63 data->io_base = ioremap(res->start, resource_size(res));
64 if (data->io_base == NULL) {
65 dev_err(&pdev->dev, "ioremap failed\n");
70 data->chip.priv = &data;
71 data->mtd.priv = &data->chip;
72 data->mtd.owner = THIS_MODULE;
73 data->mtd.name = dev_name(&pdev->dev);
75 data->chip.IO_ADDR_R = data->io_base;
76 data->chip.IO_ADDR_W = data->io_base;
77 data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
78 data->chip.dev_ready = pdata->ctrl.dev_ready;
79 data->chip.select_chip = pdata->ctrl.select_chip;
80 data->chip.write_buf = pdata->ctrl.write_buf;
81 data->chip.read_buf = pdata->ctrl.read_buf;
82 data->chip.read_byte = pdata->ctrl.read_byte;
83 data->chip.chip_delay = pdata->chip.chip_delay;
84 data->chip.options |= pdata->chip.options;
85 data->chip.bbt_options |= pdata->chip.bbt_options;
87 data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
88 data->chip.ecc.layout = pdata->chip.ecclayout;
89 data->chip.ecc.mode = NAND_ECC_SOFT;
91 platform_set_drvdata(pdev, data);
93 /* Handle any platform specific setup */
94 if (pdata->ctrl.probe) {
95 err = pdata->ctrl.probe(pdev);
100 /* Scan to find existence of the device */
101 if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
106 part_types = pdata->chip.part_probe_types ? : part_probe_types;
108 ppdata.of_node = pdev->dev.of_node;
109 err = mtd_device_parse_register(&data->mtd, part_types, &ppdata,
110 pdata->chip.partitions,
111 pdata->chip.nr_partitions);
116 nand_release(&data->mtd);
118 if (pdata->ctrl.remove)
119 pdata->ctrl.remove(pdev);
120 platform_set_drvdata(pdev, NULL);
121 iounmap(data->io_base);
123 release_mem_region(res->start, resource_size(res));
130 * Remove a NAND device.
132 static int __devexit plat_nand_remove(struct platform_device *pdev)
134 struct plat_nand_data *data = platform_get_drvdata(pdev);
135 struct platform_nand_data *pdata = pdev->dev.platform_data;
136 struct resource *res;
138 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
140 nand_release(&data->mtd);
141 if (pdata->ctrl.remove)
142 pdata->ctrl.remove(pdev);
143 iounmap(data->io_base);
144 release_mem_region(res->start, resource_size(res));
150 static const struct of_device_id plat_nand_match[] = {
151 { .compatible = "gen_nand" },
154 MODULE_DEVICE_TABLE(of, plat_nand_match);
156 static struct platform_driver plat_nand_driver = {
157 .probe = plat_nand_probe,
158 .remove = __devexit_p(plat_nand_remove),
161 .owner = THIS_MODULE,
162 .of_match_table = plat_nand_match,
166 module_platform_driver(plat_nand_driver);
168 MODULE_LICENSE("GPL");
169 MODULE_AUTHOR("Vitaly Wool");
170 MODULE_DESCRIPTION("Simple generic NAND driver");
171 MODULE_ALIAS("platform:gen_nand");