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