/* * 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");