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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/mtd/nand/raw/plat_nand.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mtd/nand/raw/plat_nand.c')
-rw-r--r--drivers/mtd/nand/raw/plat_nand.c161
1 files changed, 161 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..7e0d0a8df
--- /dev/null
+++ b/drivers/mtd/nand/raw/plat_nand.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic NAND driver
+ *
+ * Author: Vitaly Wool <vitalywool@gmail.com>
+ */
+
+#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/platnand.h>
+
+struct plat_nand_data {
+ struct nand_controller controller;
+ struct nand_chip chip;
+ void __iomem *io_base;
+};
+
+static int plat_nand_attach_chip(struct nand_chip *chip)
+{
+ if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT &&
+ chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
+ chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
+
+ return 0;
+}
+
+static const struct nand_controller_ops plat_nand_ops = {
+ .attach_chip = plat_nand_attach_chip,
+};
+
+/*
+ * 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;
+ 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;
+
+ data->controller.ops = &plat_nand_ops;
+ nand_controller_init(&data->controller);
+ data->chip.controller = &data->controller;
+
+ data->io_base = devm_platform_ioremap_resource(pdev, 0);
+ 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.legacy.IO_ADDR_R = data->io_base;
+ data->chip.legacy.IO_ADDR_W = data->io_base;
+ data->chip.legacy.cmd_ctrl = pdata->ctrl.cmd_ctrl;
+ data->chip.legacy.dev_ready = pdata->ctrl.dev_ready;
+ data->chip.legacy.select_chip = pdata->ctrl.select_chip;
+ data->chip.legacy.write_buf = pdata->ctrl.write_buf;
+ data->chip.legacy.read_buf = pdata->ctrl.read_buf;
+ data->chip.legacy.chip_delay = pdata->chip.chip_delay;
+ data->chip.options |= pdata->chip.options;
+ data->chip.bbt_options |= pdata->chip.bbt_options;
+
+ platform_set_drvdata(pdev, data);
+
+ /* Handle any platform specific setup */
+ if (pdata->ctrl.probe) {
+ err = pdata->ctrl.probe(pdev);
+ if (err)
+ goto out;
+ }
+
+ /*
+ * This driver assumes that the default ECC engine should be TYPE_SOFT.
+ * Set ->engine_type before registering the NAND devices in order to
+ * provide a driver specific default value.
+ */
+ data->chip.ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
+
+ /* 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);
+ struct nand_chip *chip = &data->chip;
+ int ret;
+
+ ret = mtd_device_unregister(nand_to_mtd(chip));
+ WARN_ON(ret);
+ nand_cleanup(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");