summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand/plat_nand.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mtd/nand/plat_nand.c')
-rw-r--r--drivers/mtd/nand/plat_nand.c150
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");