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[PATCH] eXcite nand flash driver

To: linux-mtd@lists.infradead.org
Subject: [PATCH] eXcite nand flash driver
From: Thomas Koeller <thomas.koeller@baslerweb.com>
Date: Thu, 8 Feb 2007 01:57:25 +0100
Cc: linux-mips@linux-mips.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
This is a nand flash driver for the eXcite series of intelligent
cameras manufactured by Basler Vision Technologies AG.

Signed-off-by: Thomas Koeller <thomas.koeller@baslerweb.com>
---
 drivers/mtd/nand/Kconfig            |   18 +++-
 drivers/mtd/nand/Makefile           |    1 +
 drivers/mtd/nand/excite_nandflash.c |  259 
+++++++++++++++++++++++++++++++++++
 3 files changed, 277 insertions(+), 1 deletions(-)

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 358f55a..5b50396 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -216,10 +216,26 @@ config MTD_NAND_DISKONCHIP_BBTWRITE
          Even if you leave this disabled, you can enable BBT writes at module
          load time (assuming you build diskonchip as a module) with the module
          parameter "inftl_bbt_write=1".
-
+         
 config MTD_NAND_SHARPSL
        tristate "Support for NAND Flash on Sharp SL Series (C7xx + others)"
        depends on MTD_NAND && ARCH_PXA
+ 
+config MTD_NAND_BASLER_EXCITE
+       tristate  "Support for NAND Flash on Basler eXcite"
+       depends on MTD_NAND && BASLER_EXCITE
+       help
+          This enables the driver for the NAND flash device found on the
+          Basler eXcite Smart Camera. If built as a module, the driver
+         will be named "excite_nandflash.ko".
+
+config MTD_NAND_BASLER_EXCITE
+       tristate  "Support for NAND Flash on Basler eXcite"
+       depends on MTD_NAND && BASLER_EXCITE
+       help
+          This enables the driver for the NAND flash device found on the
+          Basler eXcite Smart Camera. If built as a module, the driver
+         will be named "excite_nandflash.ko".
 
 config MTD_NAND_CAFE
        tristate "NAND support for OLPC CAFÉ chip"
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index f7a53f0..80f1dfc 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_MTD_NAND_NANDSIM)                += nands
 obj-$(CONFIG_MTD_NAND_CS553X)          += cs553x_nand.o
 obj-$(CONFIG_MTD_NAND_NDFC)            += ndfc.o
 obj-$(CONFIG_MTD_NAND_AT91)            += at91_nand.o
+obj-$(CONFIG_MTD_NAND_BASLER_EXCITE)   += excite_nandflash.o
 
 nand-objs := nand_base.o nand_bbt.o
 cafe_nand-objs := cafe.o cafe_ecc.o
diff --git a/drivers/mtd/nand/excite_nandflash.c 
b/drivers/mtd/nand/excite_nandflash.c
new file mode 100644
index 0000000..d683659
--- /dev/null
+++ b/drivers/mtd/nand/excite_nandflash.c
@@ -0,0 +1,259 @@
+/*
+*  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
+
+#define io_readb(__a__)                __raw_readb((__a__))
+#define io_writeb(__v__, __a__)        __raw_writeb((__v__), (__a__))
+
+typedef void __iomem *io_reg_t;
+
+/* 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) {
+       const char fmt[] = "%s_%u";
+       char buf[80];
+
+       if (unlikely
+           (snprintf(buf, sizeof buf, fmt, basename, d->id) >= sizeof buf))
+               return NULL;
+       return platform_get_resource_byname(d, flags, buf);
+}
+
+static inline io_reg_t
+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 (likely(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;
+       io_reg_t regs;
+};
+
+/* command and control functions */
+static void excite_nand_control(struct mtd_info *mtd, int cmd,
+                                      unsigned int ctrl)
+{
+       io_reg_t regs =
+           container_of(mtd, struct excite_nand_drvdata, board_mtd)->regs;
+       static void __iomem *tgt = NULL;
+
+       switch (ctrl) {
+       case NAND_CTRL_CHANGE | NAND_CTRL_CLE:
+               tgt = regs + EXCITE_NANDFLASH_CMD_BYTE;
+               break;
+       case NAND_CTRL_CHANGE | NAND_CTRL_ALE:
+               tgt = regs + EXCITE_NANDFLASH_ADDR_BYTE;
+               break;
+       case NAND_CTRL_CHANGE | NAND_NCE:
+               tgt = regs + EXCITE_NANDFLASH_DATA_BYTE;
+               break;
+       }
+
+       if (cmd != NAND_CMD_NONE)
+               io_writeb(cmd, tgt);
+}
+
+/* excite_nand_devready()
+ *
+ * returns 0 if the nand is busy, 1 if it is 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 io_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS_BYTE);
+}
+
+/* excite_nand_remove
+ *
+ * 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 */
+       if (likely(this->regs)) {
+               iounmap(this->regs);
+               this->regs = NULL;
+       }
+
+       kfree(this);
+
+       DEBUG(MTD_DEBUG_LEVEL1, "%s: removed\n", module_id);
+       return 0;
+}
+
+/* excite_nand_probe
+ *
+ * called by device layer when it finds a device matching
+ * one our driver can handled. 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;
+       }
+
+       /* 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)
-- 
1.4.3


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