a40f73419f
This patch works with the following three flags from two headers (nand.h and bbm.h): (1) NAND_USE_FLASH_BBT (nand.h) (2) NAND_USE_FLASH_BBT_NO_OOB (nand.h) (3) NAND_BBT_NO_OOB (bbm.h) These flags are all related and interdependent, yet they were in different headers. Flag (2) is simply the combination of (1) and (3) and can be eliminated. This patch accomplishes the following: * eliminate NAND_USE_FLASH_BBT_NO_OOB (i.e., flag (2)) * move NAND_USE_FLASH_BBT (i.e., flag (1)) to bbm.h It's important to note that because (1) and (3) are now both found in bbm.h, they should NOT be used in the "nand_chip.options" field. I removed a small section from the mtdnand DocBook because it referes to NAND_USE_FLASH_BBT in nand.h, which has been moved to bbm.h. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
248 lines
5.6 KiB
C
248 lines
5.6 KiB
C
/*
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* Copyright (C) 2006-2007 PA Semi, Inc
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*
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* Author: Egor Martovetsky <egor@pasemi.com>
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* Maintained by: Olof Johansson <olof@lixom.net>
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*
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* Driver for the PWRficient onchip NAND flash interface
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#undef DEBUG
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/nand_ecc.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/pci.h>
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#include <asm/io.h>
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#define LBICTRL_LPCCTL_NR 0x00004000
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#define CLE_PIN_CTL 15
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#define ALE_PIN_CTL 14
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static unsigned int lpcctl;
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static struct mtd_info *pasemi_nand_mtd;
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static const char driver_name[] = "pasemi-nand";
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static void pasemi_read_buf(struct mtd_info *mtd, u_char *buf, int len)
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{
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struct nand_chip *chip = mtd->priv;
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while (len > 0x800) {
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memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
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buf += 0x800;
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len -= 0x800;
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}
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memcpy_fromio(buf, chip->IO_ADDR_R, len);
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}
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static void pasemi_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
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{
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struct nand_chip *chip = mtd->priv;
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while (len > 0x800) {
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memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
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buf += 0x800;
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len -= 0x800;
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}
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memcpy_toio(chip->IO_ADDR_R, buf, len);
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}
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static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
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unsigned int ctrl)
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{
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struct nand_chip *chip = mtd->priv;
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if (cmd == NAND_CMD_NONE)
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return;
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if (ctrl & NAND_CLE)
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out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
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else
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out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
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/* Push out posted writes */
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eieio();
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inl(lpcctl);
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}
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int pasemi_device_ready(struct mtd_info *mtd)
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{
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return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
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}
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static int __devinit pasemi_nand_probe(struct platform_device *ofdev)
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{
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struct pci_dev *pdev;
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struct device_node *np = ofdev->dev.of_node;
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struct resource res;
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struct nand_chip *chip;
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int err = 0;
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err = of_address_to_resource(np, 0, &res);
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if (err)
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return -EINVAL;
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/* We only support one device at the moment */
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if (pasemi_nand_mtd)
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return -ENODEV;
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pr_debug("pasemi_nand at %pR\n", &res);
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/* Allocate memory for MTD device structure and private data */
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pasemi_nand_mtd = kzalloc(sizeof(struct mtd_info) +
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sizeof(struct nand_chip), GFP_KERNEL);
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if (!pasemi_nand_mtd) {
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printk(KERN_WARNING
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"Unable to allocate PASEMI NAND MTD device structure\n");
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err = -ENOMEM;
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goto out;
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}
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/* Get pointer to private data */
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chip = (struct nand_chip *)&pasemi_nand_mtd[1];
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/* Link the private data with the MTD structure */
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pasemi_nand_mtd->priv = chip;
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pasemi_nand_mtd->owner = THIS_MODULE;
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chip->IO_ADDR_R = of_iomap(np, 0);
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chip->IO_ADDR_W = chip->IO_ADDR_R;
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if (!chip->IO_ADDR_R) {
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err = -EIO;
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goto out_mtd;
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}
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pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
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if (!pdev) {
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err = -ENODEV;
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goto out_ior;
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}
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lpcctl = pci_resource_start(pdev, 0);
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pci_dev_put(pdev);
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if (!request_region(lpcctl, 4, driver_name)) {
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err = -EBUSY;
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goto out_ior;
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}
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chip->cmd_ctrl = pasemi_hwcontrol;
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chip->dev_ready = pasemi_device_ready;
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chip->read_buf = pasemi_read_buf;
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chip->write_buf = pasemi_write_buf;
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chip->chip_delay = 0;
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chip->ecc.mode = NAND_ECC_SOFT;
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/* Enable the following for a flash based bad block table */
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chip->options = NAND_NO_AUTOINCR;
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chip->bbt_options = NAND_USE_FLASH_BBT;
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/* Scan to find existence of the device */
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if (nand_scan(pasemi_nand_mtd, 1)) {
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err = -ENXIO;
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goto out_lpc;
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}
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if (mtd_device_register(pasemi_nand_mtd, NULL, 0)) {
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printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
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err = -ENODEV;
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goto out_lpc;
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}
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printk(KERN_INFO "PA Semi NAND flash at %08llx, control at I/O %x\n",
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res.start, lpcctl);
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return 0;
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out_lpc:
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release_region(lpcctl, 4);
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out_ior:
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iounmap(chip->IO_ADDR_R);
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out_mtd:
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kfree(pasemi_nand_mtd);
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out:
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return err;
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}
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static int __devexit pasemi_nand_remove(struct platform_device *ofdev)
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{
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struct nand_chip *chip;
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if (!pasemi_nand_mtd)
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return 0;
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chip = pasemi_nand_mtd->priv;
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/* Release resources, unregister device */
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nand_release(pasemi_nand_mtd);
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release_region(lpcctl, 4);
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iounmap(chip->IO_ADDR_R);
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/* Free the MTD device structure */
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kfree(pasemi_nand_mtd);
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pasemi_nand_mtd = NULL;
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return 0;
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}
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static const struct of_device_id pasemi_nand_match[] =
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{
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{
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.compatible = "pasemi,localbus-nand",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, pasemi_nand_match);
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static struct platform_driver pasemi_nand_driver =
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{
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.driver = {
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.name = (char*)driver_name,
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.owner = THIS_MODULE,
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.of_match_table = pasemi_nand_match,
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},
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.probe = pasemi_nand_probe,
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.remove = pasemi_nand_remove,
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};
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static int __init pasemi_nand_init(void)
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{
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return platform_driver_register(&pasemi_nand_driver);
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}
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module_init(pasemi_nand_init);
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static void __exit pasemi_nand_exit(void)
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{
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platform_driver_unregister(&pasemi_nand_driver);
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}
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module_exit(pasemi_nand_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
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MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");
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