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