--- /dev/null
+/*
+* 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)
projects / linux-2.6 / commitdiff