diff options
Diffstat (limited to 'drivers/mtd/nand/plat_nand.c')
| -rw-r--r-- | drivers/mtd/nand/plat_nand.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/mtd/nand/plat_nand.c b/drivers/mtd/nand/plat_nand.c new file mode 100644 index 00000000..6404e6e8 --- /dev/null +++ b/drivers/mtd/nand/plat_nand.c @@ -0,0 +1,157 @@ +/* + * Generic NAND driver + * + * Author: Vitaly Wool <vitalywool@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> + +struct plat_nand_data { + struct nand_chip chip; + struct mtd_info mtd; + void __iomem *io_base; +}; + +/* + * Probe for the NAND device. + */ +static int __devinit plat_nand_probe(struct platform_device *pdev) +{ + struct platform_nand_data *pdata = pdev->dev.platform_data; + struct plat_nand_data *data; + struct resource *res; + int err = 0; + + if (pdata->chip.nr_chips < 1) { + dev_err(&pdev->dev, "invalid number of chips specified\n"); + return -EINVAL; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENXIO; + + /* Allocate memory for the device structure (and zero it) */ + data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL); + if (!data) { + dev_err(&pdev->dev, "failed to allocate device structure.\n"); + return -ENOMEM; + } + + if (!request_mem_region(res->start, resource_size(res), + dev_name(&pdev->dev))) { + dev_err(&pdev->dev, "request_mem_region failed\n"); + err = -EBUSY; + goto out_free; + } + + data->io_base = ioremap(res->start, resource_size(res)); + if (data->io_base == NULL) { + dev_err(&pdev->dev, "ioremap failed\n"); + err = -EIO; + goto out_release_io; + } + + data->chip.priv = &data; + data->mtd.priv = &data->chip; + data->mtd.owner = THIS_MODULE; + data->mtd.name = dev_name(&pdev->dev); + + data->chip.IO_ADDR_R = data->io_base; + data->chip.IO_ADDR_W = data->io_base; + data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl; + data->chip.dev_ready = pdata->ctrl.dev_ready; + data->chip.select_chip = pdata->ctrl.select_chip; + data->chip.write_buf = pdata->ctrl.write_buf; + data->chip.read_buf = pdata->ctrl.read_buf; + data->chip.chip_delay = pdata->chip.chip_delay; + data->chip.options |= pdata->chip.options; + data->chip.bbt_options |= pdata->chip.bbt_options; + + data->chip.ecc.hwctl = pdata->ctrl.hwcontrol; + data->chip.ecc.layout = pdata->chip.ecclayout; + data->chip.ecc.mode = NAND_ECC_SOFT; + + platform_set_drvdata(pdev, data); + + /* Handle any platform specific setup */ + if (pdata->ctrl.probe) { + err = pdata->ctrl.probe(pdev); + if (err) + goto out; + } + + /* Scan to find existence of the device */ + if (nand_scan(&data->mtd, pdata->chip.nr_chips)) { + err = -ENXIO; + goto out; + } + + err = mtd_device_parse_register(&data->mtd, + pdata->chip.part_probe_types, NULL, + pdata->chip.partitions, + pdata->chip.nr_partitions); + + if (!err) + return err; + + nand_release(&data->mtd); +out: + if (pdata->ctrl.remove) + pdata->ctrl.remove(pdev); + platform_set_drvdata(pdev, NULL); + iounmap(data->io_base); +out_release_io: + release_mem_region(res->start, resource_size(res)); +out_free: + kfree(data); + return err; +} + +/* + * Remove a NAND device. + */ +static int __devexit plat_nand_remove(struct platform_device *pdev) +{ + struct plat_nand_data *data = platform_get_drvdata(pdev); + struct platform_nand_data *pdata = pdev->dev.platform_data; + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + nand_release(&data->mtd); + if (pdata->ctrl.remove) + pdata->ctrl.remove(pdev); + iounmap(data->io_base); + release_mem_region(res->start, resource_size(res)); + kfree(data); + + return 0; +} + +static struct platform_driver plat_nand_driver = { + .probe = plat_nand_probe, + .remove = __devexit_p(plat_nand_remove), + .driver = { + .name = "gen_nand", + .owner = THIS_MODULE, + }, +}; + +module_platform_driver(plat_nand_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Vitaly Wool"); +MODULE_DESCRIPTION("Simple generic NAND driver"); +MODULE_ALIAS("platform:gen_nand"); |