mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
7abd3ef987
The hwcontrol function enforced a step by step state machine for any kind of hardware chip access. Let the hardware driver know which control bits are set and inform it about a change of the control lines. Let the hardware driver write out the command and address bytes directly. This gives a peformance advantage for address bus controlled chips and simplifies the quirks in the hardware drivers. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
189 lines
4.5 KiB
C
189 lines
4.5 KiB
C
/*
|
|
* drivers/mtd/nand/h1910.c
|
|
*
|
|
* Copyright (C) 2003 Joshua Wise (joshua@joshuawise.com)
|
|
*
|
|
* Derived from drivers/mtd/nand/edb7312.c
|
|
* Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
|
|
* Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
|
|
*
|
|
* $Id: h1910.c,v 1.6 2005/11/07 11:14:30 gleixner Exp $
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Overview:
|
|
* This is a device driver for the NAND flash device found on the
|
|
* iPAQ h1910 board which utilizes the Samsung K9F2808 part. This is
|
|
* a 128Mibit (16MiB x 8 bits) NAND flash device.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/nand.h>
|
|
#include <linux/mtd/partitions.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/hardware.h> /* for CLPS7111_VIRT_BASE */
|
|
#include <asm/sizes.h>
|
|
#include <asm/arch/h1900-gpio.h>
|
|
#include <asm/arch/ipaq.h>
|
|
|
|
/*
|
|
* MTD structure for EDB7312 board
|
|
*/
|
|
static struct mtd_info *h1910_nand_mtd = NULL;
|
|
|
|
/*
|
|
* Module stuff
|
|
*/
|
|
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
/*
|
|
* Define static partitions for flash device
|
|
*/
|
|
static struct mtd_partition partition_info[] = {
|
|
{name:"h1910 NAND Flash",
|
|
offset:0,
|
|
size:16 * 1024 * 1024}
|
|
};
|
|
|
|
#define NUM_PARTITIONS 1
|
|
|
|
#endif
|
|
|
|
/*
|
|
* hardware specific access to control-lines
|
|
*
|
|
* NAND_NCE: bit 0 - don't care
|
|
* NAND_CLE: bit 1 - address bit 2
|
|
* NAND_ALE: bit 2 - address bit 3
|
|
*/
|
|
static void h1910_hwcontrol(struct mtd_info *mtd, int cmd,
|
|
unsigned int ctrl)
|
|
{
|
|
struct nand_chip *chip = mtd->priv;
|
|
|
|
if (cmd != NAND_CMD_NONE)
|
|
writeb(cmd, chip->IO_ADDR_W | ((ctrl & 0x6) << 1));
|
|
}
|
|
|
|
/*
|
|
* read device ready pin
|
|
*/
|
|
#if 0
|
|
static int h1910_device_ready(struct mtd_info *mtd)
|
|
{
|
|
return (GPLR(55) & GPIO_bit(55));
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Main initialization routine
|
|
*/
|
|
static int __init h1910_init(void)
|
|
{
|
|
struct nand_chip *this;
|
|
const char *part_type = 0;
|
|
int mtd_parts_nb = 0;
|
|
struct mtd_partition *mtd_parts = 0;
|
|
void __iomem *nandaddr;
|
|
|
|
if (!machine_is_h1900())
|
|
return -ENODEV;
|
|
|
|
nandaddr = ioremap(0x08000000, 0x1000);
|
|
if (!nandaddr) {
|
|
printk("Failed to ioremap nand flash.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Allocate memory for MTD device structure and private data */
|
|
h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
|
|
if (!h1910_nand_mtd) {
|
|
printk("Unable to allocate h1910 NAND MTD device structure.\n");
|
|
iounmap((void *)nandaddr);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Get pointer to private data */
|
|
this = (struct nand_chip *)(&h1910_nand_mtd[1]);
|
|
|
|
/* Initialize structures */
|
|
memset(h1910_nand_mtd, 0, sizeof(struct mtd_info));
|
|
memset(this, 0, sizeof(struct nand_chip));
|
|
|
|
/* Link the private data with the MTD structure */
|
|
h1910_nand_mtd->priv = this;
|
|
h1910_nand_mtd->owner = THIS_MODULE;
|
|
|
|
/*
|
|
* Enable VPEN
|
|
*/
|
|
GPSR(37) = GPIO_bit(37);
|
|
|
|
/* insert callbacks */
|
|
this->IO_ADDR_R = nandaddr;
|
|
this->IO_ADDR_W = nandaddr;
|
|
this->cmd_ctrl = h1910_hwcontrol;
|
|
this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */
|
|
/* 15 us command delay time */
|
|
this->chip_delay = 50;
|
|
this->ecc.mode = NAND_ECC_SOFT;
|
|
this->options = NAND_NO_AUTOINCR;
|
|
|
|
/* Scan to find existence of the device */
|
|
if (nand_scan(h1910_nand_mtd, 1)) {
|
|
printk(KERN_NOTICE "No NAND device - returning -ENXIO\n");
|
|
kfree(h1910_nand_mtd);
|
|
iounmap((void *)nandaddr);
|
|
return -ENXIO;
|
|
}
|
|
#ifdef CONFIG_MTD_CMDLINE_PARTS
|
|
mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts, "h1910-nand");
|
|
if (mtd_parts_nb > 0)
|
|
part_type = "command line";
|
|
else
|
|
mtd_parts_nb = 0;
|
|
#endif
|
|
if (mtd_parts_nb == 0) {
|
|
mtd_parts = partition_info;
|
|
mtd_parts_nb = NUM_PARTITIONS;
|
|
part_type = "static";
|
|
}
|
|
|
|
/* Register the partitions */
|
|
printk(KERN_NOTICE "Using %s partition definition\n", part_type);
|
|
add_mtd_partitions(h1910_nand_mtd, mtd_parts, mtd_parts_nb);
|
|
|
|
/* Return happy */
|
|
return 0;
|
|
}
|
|
|
|
module_init(h1910_init);
|
|
|
|
/*
|
|
* Clean up routine
|
|
*/
|
|
static void __exit h1910_cleanup(void)
|
|
{
|
|
struct nand_chip *this = (struct nand_chip *)&h1910_nand_mtd[1];
|
|
|
|
/* Release resources, unregister device */
|
|
nand_release(h1910_nand_mtd);
|
|
|
|
/* Release io resource */
|
|
iounmap((void *)this->IO_ADDR_W);
|
|
|
|
/* Free the MTD device structure */
|
|
kfree(h1910_nand_mtd);
|
|
}
|
|
|
|
module_exit(h1910_cleanup);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");
|
|
MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");
|