[MTD] [NAND] Marvell Orion device bus NAND controller
Driver for the device bus NAND controller in the Marvell Orion family
of ARM SoCs.
Signed-off-by: Tzachi Perelstein <tzachi@marvell.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Jörn Engel <joern@logfs.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/mtd/nand/orion_nand.c b/drivers/mtd/nand/orion_nand.c
new file mode 100644
index 0000000..9162cca
--- /dev/null
+++ b/drivers/mtd/nand/orion_nand.c
@@ -0,0 +1,171 @@
+/*
+ * drivers/mtd/nand/orion_nand.c
+ *
+ * NAND support for Marvell Orion SoC platforms
+ *
+ * Tzachi Perelstein <tzachi@marvell.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <asm/io.h>
+#include <asm/sizes.h>
+#include <asm/arch/platform.h>
+#include <asm/arch/hardware.h>
+
+#ifdef CONFIG_MTD_CMDLINE_PARTS
+static const char *part_probes[] = { "cmdlinepart", NULL };
+#endif
+
+static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+ struct nand_chip *nc = mtd->priv;
+ struct orion_nand_data *board = nc->priv;
+ u32 offs;
+
+ if (cmd == NAND_CMD_NONE)
+ return;
+
+ if (ctrl & NAND_CLE)
+ offs = (1 << board->cle);
+ else if (ctrl & NAND_ALE)
+ offs = (1 << board->ale);
+ else
+ return;
+
+ if (nc->options & NAND_BUSWIDTH_16)
+ offs <<= 1;
+
+ writeb(cmd, nc->IO_ADDR_W + offs);
+}
+
+static int __init orion_nand_probe(struct platform_device *pdev)
+{
+ struct mtd_info *mtd;
+ struct nand_chip *nc;
+ struct orion_nand_data *board;
+ void __iomem *io_base;
+ int ret = 0;
+#ifdef CONFIG_MTD_PARTITIONS
+ struct mtd_partition *partitions = NULL;
+ int num_part = 0;
+#endif
+
+ nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
+ if (!nc) {
+ printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
+ ret = -ENOMEM;
+ goto no_res;
+ }
+ mtd = (struct mtd_info *)(nc + 1);
+
+ io_base = ioremap(pdev->resource[0].start,
+ pdev->resource[0].end - pdev->resource[0].start + 1);
+ if (!io_base) {
+ printk(KERN_ERR "orion_nand: ioremap failed\n");
+ ret = -EIO;
+ goto no_res;
+ }
+
+ board = pdev->dev.platform_data;
+
+ mtd->priv = nc;
+ mtd->owner = THIS_MODULE;
+
+ nc->priv = board;
+ nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
+ nc->cmd_ctrl = orion_nand_cmd_ctrl;
+ nc->ecc.mode = NAND_ECC_SOFT;
+
+ if (board->width == 16)
+ nc->options |= NAND_BUSWIDTH_16;
+
+ platform_set_drvdata(pdev, mtd);
+
+ if (nand_scan(mtd, 1)) {
+ ret = -ENXIO;
+ goto no_dev;
+ }
+
+#ifdef CONFIG_MTD_PARTITIONS
+#ifdef CONFIG_MTD_CMDLINE_PARTS
+ mtd->name = "orion_nand";
+ num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
+#endif
+ /* If cmdline partitions have been passed, let them be used */
+ if (num_part <= 0) {
+ num_part = board->nr_parts;
+ partitions = board->parts;
+ }
+
+ if (partitions && num_part > 0)
+ ret = add_mtd_partitions(mtd, partitions, num_part);
+ else
+ ret = add_mtd_device(mtd);
+#else
+ ret = add_mtd_device(mtd);
+#endif
+
+ if (ret) {
+ nand_release(mtd);
+ goto no_dev;
+ }
+
+ return 0;
+
+no_dev:
+ platform_set_drvdata(pdev, NULL);
+ iounmap(io_base);
+no_res:
+ kfree(nc);
+
+ return ret;
+}
+
+static int __devexit orion_nand_remove(struct platform_device *pdev)
+{
+ struct mtd_info *mtd = platform_get_drvdata(pdev);
+ struct nand_chip *nc = mtd->priv;
+
+ nand_release(mtd);
+
+ iounmap(nc->IO_ADDR_W);
+
+ kfree(nc);
+
+ return 0;
+}
+
+static struct platform_driver orion_nand_driver = {
+ .probe = orion_nand_probe,
+ .remove = orion_nand_remove,
+ .driver = {
+ .name = "orion_nand",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init orion_nand_init(void)
+{
+ return platform_driver_register(&orion_nand_driver);
+}
+
+static void __exit orion_nand_exit(void)
+{
+ platform_driver_unregister(&orion_nand_driver);
+}
+
+module_init(orion_nand_init);
+module_exit(orion_nand_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Tzachi Perelstein");
+MODULE_DESCRIPTION("NAND glue for Orion platforms");