diff options
Diffstat (limited to 'drivers/mtd/nand/plat_nand.c')
| -rw-r--r-- | drivers/mtd/nand/plat_nand.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/drivers/mtd/nand/plat_nand.c b/drivers/mtd/nand/plat_nand.c new file mode 100644 index 000000000..4535c263f --- /dev/null +++ b/drivers/mtd/nand/plat_nand.c @@ -0,0 +1,150 @@ +/* + * 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/err.h> +#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; +}; + +static const char *part_probe_types[] = { "cmdlinepart", NULL }; + +/* + * Probe for the NAND device. + */ +static int plat_nand_probe(struct platform_device *pdev) +{ + struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev); + struct mtd_part_parser_data ppdata; + struct plat_nand_data *data; + struct resource *res; + const char **part_types; + int err = 0; + + if (!pdata) { + dev_err(&pdev->dev, "platform_nand_data is missing\n"); + return -EINVAL; + } + + if (pdata->chip.nr_chips < 1) { + dev_err(&pdev->dev, "invalid number of chips specified\n"); + return -EINVAL; + } + + /* Allocate memory for the device structure (and zero it) */ + data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->io_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(data->io_base)) + return PTR_ERR(data->io_base); + + 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.read_byte = pdata->ctrl.read_byte; + 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; + } + + part_types = pdata->chip.part_probe_types ? : part_probe_types; + + ppdata.of_node = pdev->dev.of_node; + err = mtd_device_parse_register(&data->mtd, part_types, &ppdata, + pdata->chip.partitions, + pdata->chip.nr_partitions); + + if (!err) + return err; + + nand_release(&data->mtd); +out: + if (pdata->ctrl.remove) + pdata->ctrl.remove(pdev); + return err; +} + +/* + * Remove a NAND device. + */ +static int plat_nand_remove(struct platform_device *pdev) +{ + struct plat_nand_data *data = platform_get_drvdata(pdev); + struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev); + + nand_release(&data->mtd); + if (pdata->ctrl.remove) + pdata->ctrl.remove(pdev); + + return 0; +} + +static const struct of_device_id plat_nand_match[] = { + { .compatible = "gen_nand" }, + {}, +}; +MODULE_DEVICE_TABLE(of, plat_nand_match); + +static struct platform_driver plat_nand_driver = { + .probe = plat_nand_probe, + .remove = plat_nand_remove, + .driver = { + .name = "gen_nand", + .of_match_table = plat_nand_match, + }, +}; + +module_platform_driver(plat_nand_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Vitaly Wool"); +MODULE_DESCRIPTION("Simple generic NAND driver"); +MODULE_ALIAS("platform:gen_nand"); |