Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 1 | /* |
| 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 | |
| 20 | struct plat_nand_data { |
| 21 | struct nand_chip chip; |
| 22 | struct mtd_info mtd; |
| 23 | void __iomem *io_base; |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 24 | int nr_parts; |
| 25 | struct mtd_partition *parts; |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 26 | }; |
| 27 | |
| 28 | /* |
| 29 | * Probe for the NAND device. |
| 30 | */ |
Uwe Kleine-König | 9d63287 | 2009-03-28 00:26:58 +0100 | [diff] [blame] | 31 | static int __devinit plat_nand_probe(struct platform_device *pdev) |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 32 | { |
| 33 | struct platform_nand_data *pdata = pdev->dev.platform_data; |
| 34 | struct plat_nand_data *data; |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 35 | struct resource *res; |
| 36 | int err = 0; |
| 37 | |
Marek Vasut | 01cd2aba | 2010-08-12 03:53:55 +0100 | [diff] [blame] | 38 | if (pdata->chip.nr_chips < 1) { |
| 39 | dev_err(&pdev->dev, "invalid number of chips specified\n"); |
| 40 | return -EINVAL; |
| 41 | } |
| 42 | |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 43 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 44 | if (!res) |
| 45 | return -ENXIO; |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 46 | |
| 47 | /* Allocate memory for the device structure (and zero it) */ |
| 48 | data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL); |
| 49 | if (!data) { |
| 50 | dev_err(&pdev->dev, "failed to allocate device structure.\n"); |
| 51 | return -ENOMEM; |
| 52 | } |
| 53 | |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 54 | if (!request_mem_region(res->start, resource_size(res), |
| 55 | dev_name(&pdev->dev))) { |
| 56 | dev_err(&pdev->dev, "request_mem_region failed\n"); |
| 57 | err = -EBUSY; |
| 58 | goto out_free; |
| 59 | } |
| 60 | |
| 61 | data->io_base = ioremap(res->start, resource_size(res)); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 62 | if (data->io_base == NULL) { |
| 63 | dev_err(&pdev->dev, "ioremap failed\n"); |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 64 | err = -EIO; |
| 65 | goto out_release_io; |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | data->chip.priv = &data; |
| 69 | data->mtd.priv = &data->chip; |
| 70 | data->mtd.owner = THIS_MODULE; |
Kay Sievers | 475b44c | 2009-01-06 10:44:38 -0800 | [diff] [blame] | 71 | data->mtd.name = dev_name(&pdev->dev); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 72 | |
| 73 | data->chip.IO_ADDR_R = data->io_base; |
| 74 | data->chip.IO_ADDR_W = data->io_base; |
| 75 | data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl; |
| 76 | data->chip.dev_ready = pdata->ctrl.dev_ready; |
| 77 | data->chip.select_chip = pdata->ctrl.select_chip; |
Alexander Clouter | d6fed9e | 2009-05-11 19:28:01 +0100 | [diff] [blame] | 78 | data->chip.write_buf = pdata->ctrl.write_buf; |
| 79 | data->chip.read_buf = pdata->ctrl.read_buf; |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 80 | data->chip.chip_delay = pdata->chip.chip_delay; |
| 81 | data->chip.options |= pdata->chip.options; |
Brian Norris | a40f734 | 2011-05-31 16:31:22 -0700 | [diff] [blame^] | 82 | data->chip.bbt_options |= pdata->chip.bbt_options; |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 83 | |
| 84 | data->chip.ecc.hwctl = pdata->ctrl.hwcontrol; |
| 85 | data->chip.ecc.layout = pdata->chip.ecclayout; |
| 86 | data->chip.ecc.mode = NAND_ECC_SOFT; |
| 87 | |
| 88 | platform_set_drvdata(pdev, data); |
| 89 | |
H Hartley Sweeten | bf95efd | 2009-05-12 13:46:58 -0700 | [diff] [blame] | 90 | /* Handle any platform specific setup */ |
| 91 | if (pdata->ctrl.probe) { |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 92 | err = pdata->ctrl.probe(pdev); |
| 93 | if (err) |
H Hartley Sweeten | bf95efd | 2009-05-12 13:46:58 -0700 | [diff] [blame] | 94 | goto out; |
| 95 | } |
| 96 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 97 | /* Scan to find existence of the device */ |
Marek Vasut | 81cbb0b | 2010-07-28 07:36:54 +0200 | [diff] [blame] | 98 | if (nand_scan(&data->mtd, pdata->chip.nr_chips)) { |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 99 | err = -ENXIO; |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 100 | goto out; |
| 101 | } |
| 102 | |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 103 | if (pdata->chip.part_probe_types) { |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 104 | err = parse_mtd_partitions(&data->mtd, |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 105 | pdata->chip.part_probe_types, |
| 106 | &data->parts, 0); |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 107 | if (err > 0) { |
Jamie Iles | 3ee904f | 2011-05-23 10:22:47 +0100 | [diff] [blame] | 108 | mtd_device_register(&data->mtd, data->parts, err); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 109 | return 0; |
| 110 | } |
| 111 | } |
H Hartley Sweeten | f36e20c | 2009-05-12 13:46:59 -0700 | [diff] [blame] | 112 | if (pdata->chip.set_parts) |
| 113 | pdata->chip.set_parts(data->mtd.size, &pdata->chip); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 114 | if (pdata->chip.partitions) { |
| 115 | data->parts = pdata->chip.partitions; |
Jamie Iles | 3ee904f | 2011-05-23 10:22:47 +0100 | [diff] [blame] | 116 | err = mtd_device_register(&data->mtd, data->parts, |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 117 | pdata->chip.nr_partitions); |
| 118 | } else |
Jamie Iles | 3ee904f | 2011-05-23 10:22:47 +0100 | [diff] [blame] | 119 | err = mtd_device_register(&data->mtd, NULL, 0); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 120 | |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 121 | if (!err) |
| 122 | return err; |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 123 | |
| 124 | nand_release(&data->mtd); |
| 125 | out: |
H Hartley Sweeten | bf95efd | 2009-05-12 13:46:58 -0700 | [diff] [blame] | 126 | if (pdata->ctrl.remove) |
| 127 | pdata->ctrl.remove(pdev); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 128 | platform_set_drvdata(pdev, NULL); |
| 129 | iounmap(data->io_base); |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 130 | out_release_io: |
| 131 | release_mem_region(res->start, resource_size(res)); |
| 132 | out_free: |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 133 | kfree(data); |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 134 | return err; |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Remove a NAND device. |
| 139 | */ |
| 140 | static int __devexit plat_nand_remove(struct platform_device *pdev) |
| 141 | { |
| 142 | struct plat_nand_data *data = platform_get_drvdata(pdev); |
| 143 | struct platform_nand_data *pdata = pdev->dev.platform_data; |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 144 | struct resource *res; |
| 145 | |
| 146 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 147 | |
| 148 | nand_release(&data->mtd); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 149 | if (data->parts && data->parts != pdata->chip.partitions) |
| 150 | kfree(data->parts); |
H Hartley Sweeten | bf95efd | 2009-05-12 13:46:58 -0700 | [diff] [blame] | 151 | if (pdata->ctrl.remove) |
| 152 | pdata->ctrl.remove(pdev); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 153 | iounmap(data->io_base); |
H Hartley Sweeten | 2d098a7 | 2009-10-19 19:45:29 -0400 | [diff] [blame] | 154 | release_mem_region(res->start, resource_size(res)); |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 155 | kfree(data); |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | static struct platform_driver plat_nand_driver = { |
| 161 | .probe = plat_nand_probe, |
Thomas Chou | 24b5ce2 | 2009-04-21 12:27:34 +0800 | [diff] [blame] | 162 | .remove = __devexit_p(plat_nand_remove), |
Vitaly Wool | 711fdf6 | 2007-05-06 19:31:18 +0400 | [diff] [blame] | 163 | .driver = { |
| 164 | .name = "gen_nand", |
| 165 | .owner = THIS_MODULE, |
| 166 | }, |
| 167 | }; |
| 168 | |
| 169 | static int __init plat_nand_init(void) |
| 170 | { |
| 171 | return platform_driver_register(&plat_nand_driver); |
| 172 | } |
| 173 | |
| 174 | static void __exit plat_nand_exit(void) |
| 175 | { |
| 176 | platform_driver_unregister(&plat_nand_driver); |
| 177 | } |
| 178 | |
| 179 | module_init(plat_nand_init); |
| 180 | module_exit(plat_nand_exit); |
| 181 | |
| 182 | MODULE_LICENSE("GPL"); |
| 183 | MODULE_AUTHOR("Vitaly Wool"); |
| 184 | MODULE_DESCRIPTION("Simple generic NAND driver"); |
Kay Sievers | 1ff1842 | 2008-04-18 13:44:27 -0700 | [diff] [blame] | 185 | MODULE_ALIAS("platform:gen_nand"); |