[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>

3 files changed, 181 insertions, 0 deletions

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index f8db62512090..0a840d5d75ae 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -312,4 +312,13 @@ config MTD_ALAUDA
           These two (and possibly other) Alauda-based cardreaders for
           SmartMedia and xD allow raw flash access.
 
+config MTD_NAND_ORION
+        tristate "NAND Flash support for Marvell Orion SoC"
+        depends on ARCH_ORION && MTD_NAND
+        help
+          This enables the NAND flash controller on Orion machines.
+
+          No board specific support is done by this driver, each board
+          must advertise a platform_device for the driver to attach.
+
 endif # MTD_NAND
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index fd5004795ec1..e35f5ea3a7a9 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -30,5 +30,6 @@ obj-$(CONFIG_MTD_NAND_BASLER_EXCITE)	+= excite_nandflash.o
 obj-$(CONFIG_MTD_NAND_PLATFORM)         += plat_nand.o
 obj-$(CONFIG_MTD_ALAUDA)                += alauda.o
 obj-$(CONFIG_MTD_NAND_PASEMI)           += pasemi_nand.o
+obj-$(CONFIG_MTD_NAND_ORION)            += orion_nand.o
 
 nand-objs := nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/orion_nand.c b/drivers/mtd/nand/orion_nand.c
new file mode 100644
index 000000000000..9162cca0182b
--- /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");