--- /dev/null
+/*
+* Copyright (C) 2005 by Basler Vision Technologies AG
+* Author: 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/device.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+
+#include <excite.h>
+
+#include <asm/io.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/mtd/partitions.h>
+#include <asm/rm9k-ocd.h> // for ocd_write
+#include <linux/workqueue.h> // for queue
+
+#include "excite_nandflash.h"
+#include "nandflash.h"
+
+#define PFX "excite flashtest: "
+typedef void __iomem *io_reg_t;
+
+#define io_readb(__a__) __raw_readb((__a__))
+#define io_writeb(__v__, __a__) __raw_writeb((__v__), (__a__))
+
+
+
+static inline const struct resource *excite_nandflash_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_nandflash_map_regs(struct platform_device *d, const char *basename)
+{
+ void *result = NULL;
+ const struct resource *const r =
+ excite_nandflash_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_nandflash_drvdata {
+ struct mtd_info board_mtd;
+ struct nand_chip board_chip;
+ io_reg_t regs;
+};
+
+
+/* command and control functions */
+static void excite_nandflash_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+ struct nand_chip *this = mtd->priv;
+ io_reg_t regs = container_of(mtd,struct excite_nandflash_drvdata,board_mtd)->regs;
+
+ switch (cmd) {
+ /* Select the command latch */
+ case NAND_CTL_SETCLE: this->IO_ADDR_W = regs + EXCITE_NANDFLASH_CMD;
+ break;
+ /* Deselect the command latch */
+ case NAND_CTL_CLRCLE: this->IO_ADDR_W = regs + EXCITE_NANDFLASH_DATA;
+ break;
+ /* Select the address latch */
+ case NAND_CTL_SETALE: this->IO_ADDR_W = regs + EXCITE_NANDFLASH_ADDR;
+ break;
+ /* Deselect the address latch */
+ case NAND_CTL_CLRALE: this->IO_ADDR_W = regs + EXCITE_NANDFLASH_DATA;
+ break;
+ /* Select the chip -- not used */
+ case NAND_CTL_SETNCE:
+ break;
+ /* Deselect the chip -- not used */
+ case NAND_CTL_CLRNCE:
+ break;
+ }
+
+ this->IO_ADDR_R = this->IO_ADDR_W;
+}
+
+/* excite_nandflash_devready()
+ *
+ * returns 0 if the nand is busy, 1 if it is ready
+ */
+static int excite_nandflash_devready(struct mtd_info *mtd)
+{
+ struct excite_nandflash_drvdata *drvdata =
+ container_of(mtd, struct excite_nandflash_drvdata, board_mtd);
+
+ return io_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS);
+}
+
+/* device management functions */
+
+/* excite_nandflash_remove
+ *
+ * called by device layer to remove the driver
+ * the binding to the mtd and all allocated
+ * resources are released
+ */
+static int excite_nandflash_remove(struct device *dev)
+{
+ struct excite_nandflash_drvdata *this = dev_get_drvdata(dev);
+
+ pr_info(PFX "remove");
+
+ dev_set_drvdata(dev, NULL);
+
+ if (this == NULL) {
+ pr_debug(PFX "call remove without private data!!");
+ return 0;
+ }
+
+
+ /* free the common resources */
+ if (this->regs != NULL) {
+ iounmap(this->regs);
+ this->regs = NULL;
+ }
+
+ kfree(this);
+
+ return 0;
+}
+
+static int elapsed;
+
+void my_workqueue_handler(void *arg)
+{
+ elapsed = 1;
+}
+
+DECLARE_WORK(sigElapsed, my_workqueue_handler, 0);
+
+
+/* excite_nandflash_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 excite_nandflash_probe(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ struct excite_nandflash_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 err = 0;
+ int count = 0;
+ struct timeval tv,endtv;
+ unsigned int dt;
+
+ pr_info(PFX "probe dev: (%p)\n", dev);
+
+ pr_info(PFX "adjust LB timing\n");
+ ocd_writel(0x00000330, LDP2);
+
+ drvdata = kmalloc(sizeof(*drvdata), GFP_KERNEL);
+ if (unlikely(!drvdata)) {
+ printk(KERN_ERR PFX "no memory for drvdata\n");
+ err = -ENOMEM;
+ goto mem_error;
+ }
+
+ /* Initialize structures */
+ memset(drvdata, 0, sizeof(*drvdata));
+
+ /* bind private data into driver */
+ dev_set_drvdata(dev, drvdata);
+
+ /* allocate and map the resource */
+ drvdata->regs =
+ excite_nandflash_map_regs(pdev, EXCITE_NANDFLASH_RESOURCE_REGS);
+
+ if (unlikely(!drvdata->regs)) {
+ printk(KERN_ERR PFX "cannot reserve register region\n");
+ err = -ENXIO;
+ goto io_error;
+ }
+
+ /* initialise our chip */
+ board_chip = &drvdata->board_chip;
+
+ board_chip->IO_ADDR_R = drvdata->regs + EXCITE_NANDFLASH_DATA;
+ board_chip->IO_ADDR_W = drvdata->regs + EXCITE_NANDFLASH_DATA;
+
+ board_chip->hwcontrol = excite_nandflash_hwcontrol;
+ board_chip->dev_ready = excite_nandflash_devready;
+
+ board_chip->chip_delay = 25;
+ #if 0
+ /* TODO: speedup the initial scan */
+ board_chip->options = NAND_USE_FLASH_BBT;
+ #endif
+ board_chip->eccmode = NAND_ECC_SOFT;
+
+ /* link chip to mtd */
+ board_mtd = &drvdata->board_mtd;
+ board_mtd->priv = board_chip;
+
+
+ pr_info(PFX "FlashTest\n");
+ elapsed = 0;
+/* schedule_delayed_work(&sigElapsed, 1*HZ);
+ while (!elapsed) {
+ io_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS);
+ count++;
+ }
+ pr_info(PFX "reads in 1 sec --> %d\n",count);
+*/
+ do_gettimeofday(&tv);
+ for (count = 0 ; count < 1000000; count ++) {
+ io_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS);
+ }
+ do_gettimeofday(&endtv);
+ dt = (endtv.tv_sec - tv.tv_sec) * 1000000 + endtv.tv_usec - tv.tv_usec;
+ pr_info(PFX "%8d us timeval\n",dt);
+ pr_info(PFX "EndFlashTest\n");
+
+/* return with error to unload everything
+*/
+io_error:
+ iounmap(drvdata->regs);
+
+mem_error:
+ kfree(drvdata);
+
+ if (err == 0)
+ err = -EINVAL;
+ return err;
+}
+
+static struct device_driver excite_nandflash_driver = {
+ .name = "excite_nand",
+ .bus = &platform_bus_type,
+ .probe = excite_nandflash_probe,
+ .remove = excite_nandflash_remove,
+};
+
+static int __init excite_nandflash_init(void)
+{
+ pr_info(PFX "register Driver (Rev: $Revision:$)\n");
+ return driver_register(&excite_nandflash_driver);
+}
+
+static void __exit excite_nandflash_exit(void)
+{
+ driver_unregister(&excite_nandflash_driver);
+ pr_info(PFX "Driver unregistered");
+}
+
+module_init(excite_nandflash_init);
+module_exit(excite_nandflash_exit);
+
+MODULE_AUTHOR("Thies Moeller <thies.moeller@baslerweb.com>");
+MODULE_DESCRIPTION("Basler eXcite NAND-Flash driver");
+MODULE_LICENSE("GPL");
git://git.onelab.eu / linux-2.6.git / blobdiff