diff options
Diffstat (limited to 'arch/mips/basler/excite/excite_flashtest.c')
| -rw-r--r-- | arch/mips/basler/excite/excite_flashtest.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/arch/mips/basler/excite/excite_flashtest.c b/arch/mips/basler/excite/excite_flashtest.c new file mode 100644 index 0000000..f0024a8 --- /dev/null +++ b/arch/mips/basler/excite/excite_flashtest.c @@ -0,0 +1,294 @@ +/* +* 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"); |
