[MTD] [NAND] pasemi_nand driver (846fc31d) · Commits · e / devices / android_kernel_teracube_2e

drivers/mtd/nand/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -283,6 +283,12 @@ config MTD_NAND_CM_X270
		tristate "Support for NAND Flash on CM-X270 modules"
		depends on MTD_NAND && MACH_ARMCORE

		config MTD_NAND_PASEMI
		tristate "NAND support for PA Semi PWRficient"
		depends on MTD_NAND && PPC_PASEMI
		help
		Enables support for NAND Flash interface on PA Semi PWRficient
		based boards

		config MTD_NAND_NANDSIM
		tristate "Support for NAND Flash Simulator"

drivers/mtd/nand/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -29,5 +29,6 @@ obj-$(CONFIG_MTD_NAND_CM_X270) += cmx270_nand.o
		obj-$(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

		nand-objs := nand_base.o nand_bbt.o

drivers/mtd/nand/pasemi_nand.c

0 → 100644

+243 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2006-2007 PA Semi, Inc
		*
		* Author: Egor Martovetsky <egor@pasemi.com>
		* Maintained by: Olof Johansson <olof@lixom.net>
		*
		* Driver for the PWRficient onchip NAND flash interface
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#undef DEBUG

		#include <linux/slab.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/mtd/mtd.h>
		#include <linux/mtd/nand.h>
		#include <linux/mtd/nand_ecc.h>
		#include <linux/of_platform.h>
		#include <linux/platform_device.h>
		#include <linux/pci.h>

		#include <asm/io.h>

		#define LBICTRL_LPCCTL_NR 0x00004000
		#define CLE_PIN_CTL 15
		#define ALE_PIN_CTL 14

		static unsigned int lpcctl;
		static struct mtd_info *pasemi_nand_mtd;
		static const char driver_name[] = "pasemi-nand";

		static void pasemi_read_buf(struct mtd_info mtd, u_char buf, int len)
		{
		struct nand_chip *chip = mtd->priv;

		while (len > 0x800) {
		memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
		buf += 0x800;
		len -= 0x800;
		}
		memcpy_fromio(buf, chip->IO_ADDR_R, len);
		}

		static void pasemi_write_buf(struct mtd_info mtd, const u_char buf, int len)
		{
		struct nand_chip *chip = mtd->priv;

		while (len > 0x800) {
		memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
		buf += 0x800;
		len -= 0x800;
		}
		memcpy_toio(chip->IO_ADDR_R, buf, len);
		}

		static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
		unsigned int ctrl)
		{
		struct nand_chip *chip = mtd->priv;

		if (cmd == NAND_CMD_NONE)
		return;

		if (ctrl & NAND_CLE)
		out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
		else
		out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);

		/* Push out posted writes */
		eieio();
		inl(lpcctl);
		}

		int pasemi_device_ready(struct mtd_info *mtd)
		{
		return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
		}

		static int __devinit pasemi_nand_probe(struct of_device *ofdev,
		const struct of_device_id *match)
		{
		struct pci_dev *pdev;
		struct device_node *np = ofdev->node;
		struct resource res;
		struct nand_chip *chip;
		int err = 0;

		err = of_address_to_resource(np, 0, &res);

		if (err)
		return -EINVAL;

		/* We only support one device at the moment */
		if (pasemi_nand_mtd)
		return -ENODEV;

		pr_debug("pasemi_nand at %lx-%lx\n", res.start, res.end);

		/* Allocate memory for MTD device structure and private data */
		pasemi_nand_mtd = kzalloc(sizeof(struct mtd_info) +
		sizeof(struct nand_chip), GFP_KERNEL);
		if (!pasemi_nand_mtd) {
		printk(KERN_WARNING
		"Unable to allocate PASEMI NAND MTD device structure\n");
		err = -ENOMEM;
		goto out;
		}

		/* Get pointer to private data */
		chip = (struct nand_chip *)&pasemi_nand_mtd[1];

		/* Link the private data with the MTD structure */
		pasemi_nand_mtd->priv = chip;
		pasemi_nand_mtd->owner = THIS_MODULE;

		chip->IO_ADDR_R = of_iomap(np, 0);
		chip->IO_ADDR_W = chip->IO_ADDR_R;

		if (!chip->IO_ADDR_R) {
		err = -EIO;
		goto out_mtd;
		}

		pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
		if (!pdev) {
		err = -ENODEV;
		goto out_ior;
		}

		lpcctl = pci_resource_start(pdev, 0);

		if (!request_region(lpcctl, 4, driver_name)) {
		err = -EBUSY;
		goto out_ior;
		}

		chip->cmd_ctrl = pasemi_hwcontrol;
		chip->dev_ready = pasemi_device_ready;
		chip->read_buf = pasemi_read_buf;
		chip->write_buf = pasemi_write_buf;
		chip->chip_delay = 0;
		chip->ecc.mode = NAND_ECC_SOFT;

		/* Enable the following for a flash based bad block table */
		chip->options = NAND_USE_FLASH_BBT \| NAND_NO_AUTOINCR;

		/* Scan to find existance of the device */
		if (nand_scan(pasemi_nand_mtd, 1)) {
		err = -ENXIO;
		goto out_lpc;
		}

		if (add_mtd_device(pasemi_nand_mtd)) {
		printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
		err = -ENODEV;
		goto out_lpc;
		}

		printk(KERN_INFO "PA Semi NAND flash at %08lx, control at I/O %x\n",
		res.start, lpcctl);

		return 0;

		out_lpc:
		release_region(lpcctl, 4);
		out_ior:
		iounmap(chip->IO_ADDR_R);
		out_mtd:
		kfree(pasemi_nand_mtd);
		out:
		return err;
		}

		static int __devexit pasemi_nand_remove(struct of_device *ofdev)
		{
		struct nand_chip *chip;

		if (!pasemi_nand_mtd)
		return 0;

		chip = pasemi_nand_mtd->priv;

		/* Release resources, unregister device */
		nand_release(pasemi_nand_mtd);

		release_region(lpcctl, 4);

		iounmap(chip->IO_ADDR_R);

		/* Free the MTD device structure */
		kfree(pasemi_nand_mtd);

		pasemi_nand_mtd = NULL;

		return 0;
		}

		static struct of_device_id pasemi_nand_match[] =
		{
		{
		.compatible = "pasemi,localbus-nand",
		},
		{},
		};

		MODULE_DEVICE_TABLE(of, pasemi_nand_match);

		static struct of_platform_driver pasemi_nand_driver =
		{
		.name = (char*)driver_name,
		.match_table = pasemi_nand_match,
		.probe = pasemi_nand_probe,
		.remove = pasemi_nand_remove,
		};

		static int __init pasemi_nand_init(void)
		{
		return of_register_platform_driver(&pasemi_nand_driver);
		}
		module_init(pasemi_nand_init);

		static void __exit pasemi_nand_exit(void)
		{
		of_unregister_platform_driver(&pasemi_nand_driver);
		}
		module_exit(pasemi_nand_exit);

		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
		MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");