/*
* 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");
