[MTD] [NAND] Marvell Orion device bus NAND controller (2a1dba29) · Commits · e / devices / android_kernel_teracube_2e

drivers/mtd/nand/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/mtd/nand/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/mtd/nand/orion_nand.c

0 → 100644

+171 −0

Original line number	Diff line number	Diff line
		/*
		* 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");