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 20struct plat_nand_data { 21 struct nand_chip chip; 22 struct mtd_info mtd; 23 void __iomem *io_base; 24#ifdef CONFIG_MTD_PARTITIONS 25 int nr_parts; 26 struct mtd_partition *parts; 27#endif 28}; 29 30/* 31 * Probe for the NAND device. 32 */ 33static int __devinit plat_nand_probe(struct platform_device *pdev) 34{ 35 struct platform_nand_data *pdata = pdev->dev.platform_data; 36 struct plat_nand_data *data; 37 struct resource *res; 38 int err = 0; 39 40 if (pdata->chip.nr_chips < 1) { 41 dev_err(&pdev->dev, "invalid number of chips specified\n"); 42 return -EINVAL; 43 } 44 45 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 46 if (!res) 47 return -ENXIO; 48 49 /* Allocate memory for the device structure (and zero it) */ 50 data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL); 51 if (!data) { 52 dev_err(&pdev->dev, "failed to allocate device structure.\n"); 53 return -ENOMEM; 54 } 55 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"); 59 err = -EBUSY; 60 goto out_free; 61 } 62 63 data->io_base = ioremap(res->start, resource_size(res)); 64 if (data->io_base == NULL) { 65 dev_err(&pdev->dev, "ioremap failed\n"); 66 err = -EIO; 67 goto out_release_io; 68 } 69 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); 74 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.chip_delay = pdata->chip.chip_delay; 83 data->chip.options |= pdata->chip.options; 84 85 data->chip.ecc.hwctl = pdata->ctrl.hwcontrol; 86 data->chip.ecc.layout = pdata->chip.ecclayout; 87 data->chip.ecc.mode = NAND_ECC_SOFT; 88 89 platform_set_drvdata(pdev, data); 90 91 /* Handle any platform specific setup */ 92 if (pdata->ctrl.probe) { 93 err = pdata->ctrl.probe(pdev); 94 if (err) 95 goto out; 96 } 97 98 /* Scan to find existance of the device */ 99 if (nand_scan(&data->mtd, pdata->chip.nr_chips)) { 100 err = -ENXIO; 101 goto out; 102 } 103 104#ifdef CONFIG_MTD_PARTITIONS 105 if (pdata->chip.part_probe_types) { 106 err = parse_mtd_partitions(&data->mtd, 107 pdata->chip.part_probe_types, 108 &data->parts, 0); 109 if (err > 0) { 110 add_mtd_partitions(&data->mtd, data->parts, err); 111 return 0; 112 } 113 } 114 if (pdata->chip.set_parts) 115 pdata->chip.set_parts(data->mtd.size, &pdata->chip); 116 if (pdata->chip.partitions) { 117 data->parts = pdata->chip.partitions; 118 err = add_mtd_partitions(&data->mtd, data->parts, 119 pdata->chip.nr_partitions); 120 } else 121#endif 122 err = add_mtd_device(&data->mtd); 123 124 if (!err) 125 return err; 126 127 nand_release(&data->mtd); 128out: 129 if (pdata->ctrl.remove) 130 pdata->ctrl.remove(pdev); 131 platform_set_drvdata(pdev, NULL); 132 iounmap(data->io_base); 133out_release_io: 134 release_mem_region(res->start, resource_size(res)); 135out_free: 136 kfree(data); 137 return err; 138} 139 140/* 141 * Remove a NAND device. 142 */ 143static int __devexit plat_nand_remove(struct platform_device *pdev) 144{ 145 struct plat_nand_data *data = platform_get_drvdata(pdev); 146 struct platform_nand_data *pdata = pdev->dev.platform_data; 147 struct resource *res; 148 149 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 150 151 nand_release(&data->mtd); 152#ifdef CONFIG_MTD_PARTITIONS 153 if (data->parts && data->parts != pdata->chip.partitions) 154 kfree(data->parts); 155#endif 156 if (pdata->ctrl.remove) 157 pdata->ctrl.remove(pdev); 158 iounmap(data->io_base); 159 release_mem_region(res->start, resource_size(res)); 160 kfree(data); 161 162 return 0; 163} 164 165static struct platform_driver plat_nand_driver = { 166 .probe = plat_nand_probe, 167 .remove = __devexit_p(plat_nand_remove), 168 .driver = { 169 .name = "gen_nand", 170 .owner = THIS_MODULE, 171 }, 172}; 173 174static int __init plat_nand_init(void) 175{ 176 return platform_driver_register(&plat_nand_driver); 177} 178 179static void __exit plat_nand_exit(void) 180{ 181 platform_driver_unregister(&plat_nand_driver); 182} 183 184module_init(plat_nand_init); 185module_exit(plat_nand_exit); 186 187MODULE_LICENSE("GPL"); 188MODULE_AUTHOR("Vitaly Wool"); 189MODULE_DESCRIPTION("Simple generic NAND driver"); 190MODULE_ALIAS("platform:gen_nand"); 191