diff options
Diffstat (limited to 'drivers/mtd/nand/excite_nandflash.c')
| -rw-r--r-- | drivers/mtd/nand/excite_nandflash.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/drivers/mtd/nand/excite_nandflash.c b/drivers/mtd/nand/excite_nandflash.c new file mode 100644 index 000000000000..7e9afc4c7757 --- /dev/null +++ b/drivers/mtd/nand/excite_nandflash.c @@ -0,0 +1,248 @@ +/* +* Copyright (C) 2005 - 2007 by Basler Vision Technologies AG +* Author: Thomas Koeller <thomas.koeller.qbaslerweb.com> +* Original code by Thies Moeller <thies.moeller@baslerweb.com> +* +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation; either version 2 of the License, or +* (at your option) any later version. +* +* 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 +*/ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/ioport.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/kernel.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/nand_ecc.h> +#include <linux/mtd/partitions.h> + +#include <asm/io.h> +#include <asm/rm9k-ocd.h> + +#include <excite_nandflash.h> + +#define EXCITE_NANDFLASH_VERSION "0.1" + +/* I/O register offsets */ +#define EXCITE_NANDFLASH_DATA_BYTE 0x00 +#define EXCITE_NANDFLASH_STATUS_BYTE 0x0c +#define EXCITE_NANDFLASH_ADDR_BYTE 0x10 +#define EXCITE_NANDFLASH_CMD_BYTE 0x14 + +/* prefix for debug output */ +static const char module_id[] = "excite_nandflash"; + +/* + * partition definition + */ +static const struct mtd_partition partition_info[] = { + { + .name = "eXcite RootFS", + .offset = 0, + .size = MTDPART_SIZ_FULL + } +}; + +static inline const struct resource * +excite_nand_get_resource(struct platform_device *d, unsigned long flags, + const char *basename) +{ + char buf[80]; + + if (snprintf(buf, sizeof buf, "%s_%u", basename, d->id) >= sizeof buf) + return NULL; + return platform_get_resource_byname(d, flags, buf); +} + +static inline void __iomem * +excite_nand_map_regs(struct platform_device *d, const char *basename) +{ + void *result = NULL; + const struct resource *const r = + excite_nand_get_resource(d, IORESOURCE_MEM, basename); + + if (r) + result = ioremap_nocache(r->start, r->end + 1 - r->start); + return result; +} + +/* controller and mtd information */ +struct excite_nand_drvdata { + struct mtd_info board_mtd; + struct nand_chip board_chip; + void __iomem *regs; + void __iomem *tgt; +}; + +/* Control function */ +static void excite_nand_control(struct mtd_info *mtd, int cmd, + unsigned int ctrl) +{ + struct excite_nand_drvdata * const d = + container_of(mtd, struct excite_nand_drvdata, board_mtd); + + switch (ctrl) { + case NAND_CTRL_CHANGE | NAND_CTRL_CLE: + d->tgt = d->regs + EXCITE_NANDFLASH_CMD_BYTE; + break; + case NAND_CTRL_CHANGE | NAND_CTRL_ALE: + d->tgt = d->regs + EXCITE_NANDFLASH_ADDR_BYTE; + break; + case NAND_CTRL_CHANGE | NAND_NCE: + d->tgt = d->regs + EXCITE_NANDFLASH_DATA_BYTE; + break; + } + + if (cmd != NAND_CMD_NONE) + __raw_writeb(cmd, d->tgt); +} + +/* Return 0 if flash is busy, 1 if ready */ +static int excite_nand_devready(struct mtd_info *mtd) +{ + struct excite_nand_drvdata * const drvdata = + container_of(mtd, struct excite_nand_drvdata, board_mtd); + + return __raw_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS_BYTE); +} + +/* + * Called by device layer to remove the driver. + * The binding to the mtd and all allocated + * resources are released. + */ +static int __exit excite_nand_remove(struct device *dev) +{ + struct excite_nand_drvdata * const this = dev_get_drvdata(dev); + + dev_set_drvdata(dev, NULL); + + if (unlikely(!this)) { + printk(KERN_ERR "%s: called %s without private data!!", + module_id, __func__); + return -EINVAL; + } + + /* first thing we need to do is release our mtd + * then go through freeing the resource used + */ + nand_release(&this->board_mtd); + + /* free the common resources */ + iounmap(this->regs); + kfree(this); + + DEBUG(MTD_DEBUG_LEVEL1, "%s: removed\n", module_id); + return 0; +} + +/* + * Called by device layer when it finds a device matching + * one our driver can handle. This code checks to see if + * it can allocate all necessary resources then calls the + * nand layer to look for devices. +*/ +static int __init excite_nand_probe(struct device *dev) +{ + struct platform_device * const pdev = to_platform_device(dev); + struct excite_nand_drvdata *drvdata; /* private driver data */ + struct nand_chip *board_chip; /* private flash chip data */ + struct mtd_info *board_mtd; /* mtd info for this board */ + int scan_res; + + drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL); + if (unlikely(!drvdata)) { + printk(KERN_ERR "%s: no memory for drvdata\n", + module_id); + return -ENOMEM; + } + + /* bind private data into driver */ + dev_set_drvdata(dev, drvdata); + + /* allocate and map the resource */ + drvdata->regs = + excite_nand_map_regs(pdev, EXCITE_NANDFLASH_RESOURCE_REGS); + + if (unlikely(!drvdata->regs)) { + printk(KERN_ERR "%s: cannot reserve register region\n", + module_id); + kfree(drvdata); + return -ENXIO; + } + + drvdata->tgt = drvdata->regs + EXCITE_NANDFLASH_DATA_BYTE; + + /* initialise our chip */ + board_chip = &drvdata->board_chip; + board_chip->IO_ADDR_R = board_chip->IO_ADDR_W = + drvdata->regs + EXCITE_NANDFLASH_DATA_BYTE; + board_chip->cmd_ctrl = excite_nand_control; + board_chip->dev_ready = excite_nand_devready; + board_chip->chip_delay = 25; + board_chip->ecc.mode = NAND_ECC_SOFT; + + /* link chip to mtd */ + board_mtd = &drvdata->board_mtd; + board_mtd->priv = board_chip; + + DEBUG(MTD_DEBUG_LEVEL2, "%s: device scan\n", module_id); + scan_res = nand_scan(&drvdata->board_mtd, 1); + + if (likely(!scan_res)) { + DEBUG(MTD_DEBUG_LEVEL2, "%s: register partitions\n", module_id); + add_mtd_partitions(&drvdata->board_mtd, partition_info, + sizeof partition_info / sizeof partition_info[0]); + } else { + iounmap(drvdata->regs); + kfree(drvdata); + printk(KERN_ERR "%s: device scan failed\n", module_id); + return -EIO; + } + return 0; +} + +static struct device_driver excite_nand_driver = { + .name = "excite_nand", + .bus = &platform_bus_type, + .probe = excite_nand_probe, + .remove = __exit_p(excite_nand_remove) +}; + +static int __init excite_nand_init(void) +{ + pr_info("Basler eXcite nand flash driver Version " + EXCITE_NANDFLASH_VERSION "\n"); + return driver_register(&excite_nand_driver); +} + +static void __exit excite_nand_exit(void) +{ + driver_unregister(&excite_nand_driver); +} + +module_init(excite_nand_init); +module_exit(excite_nand_exit); + +MODULE_AUTHOR("Thomas Koeller <thomas.koeller@baslerweb.com>"); +MODULE_DESCRIPTION("Basler eXcite NAND-Flash driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(EXCITE_NANDFLASH_VERSION) |