[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/Kconfig b/drivers/mtd/nand/Kconfig
index f8db625..0a840d5 100644 (file)
--- 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 fd50047..e35f5ea 100644 (file)
--- 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 (file)
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");