Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/mtd/nand/raw/plat_nand.c b/drivers/mtd/nand/raw/plat_nand.c
new file mode 100644
index 000000000..27365bd86
--- /dev/null
+++ b/drivers/mtd/nand/raw/plat_nand.c
@@ -0,0 +1,142 @@
+/*
+ * 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/rawnand.h>
+#include <linux/mtd/partitions.h>
+
+struct plat_nand_data {
+	struct nand_chip	chip;
+	void __iomem		*io_base;
+};
+
+/*
+ * 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 plat_nand_data *data;
+	struct mtd_info *mtd;
+	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);
+
+	nand_set_flash_node(&data->chip, pdev->dev.of_node);
+	mtd = nand_to_mtd(&data->chip);
+	mtd->dev.parent = &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.mode = NAND_ECC_SOFT;
+	data->chip.ecc.algo = NAND_ECC_HAMMING;
+
+	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 */
+	err = nand_scan(&data->chip, pdata->chip.nr_chips);
+	if (err)
+		goto out;
+
+	part_types = pdata->chip.part_probe_types;
+
+	err = mtd_device_parse_register(mtd, part_types, NULL,
+					pdata->chip.partitions,
+					pdata->chip.nr_partitions);
+
+	if (!err)
+		return err;
+
+	nand_cleanup(&data->chip);
+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->chip);
+	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");