177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
/*
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* drivers/mtd/nand/spia.c
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*
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* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
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*
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*
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* 10-29-2001 TG change to support hardwarespecific access
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* to controllines (due to change in nand.c)
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* page_cache added
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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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* SPIA board which utilizes the Toshiba TC58V64AFT part. This is
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* a 64Mibit (8MiB x 8 bits) NAND flash device.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.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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/*
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* MTD structure for SPIA board
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*/
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static struct mtd_info *spia_mtd = NULL;
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/*
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* Values specific to the SPIA board (used with EP7212 processor)
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*/
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#define SPIA_IO_BASE 0xd0000000 /* Start of EP7212 IO address space */
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#define SPIA_FIO_BASE 0xf0000000 /* Address where flash is mapped */
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#define SPIA_PEDR 0x0080 /*
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* IO offset to Port E data register
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* where the CLE, ALE and NCE pins
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* are wired to.
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*/
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#define SPIA_PEDDR 0x00c0 /*
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* IO offset to Port E data direction
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* register so we can control the IO
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* lines.
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*/
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/*
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* Module stuff
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*/
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static int spia_io_base = SPIA_IO_BASE;
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static int spia_fio_base = SPIA_FIO_BASE;
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static int spia_pedr = SPIA_PEDR;
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static int spia_peddr = SPIA_PEDDR;
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module_param(spia_io_base, int, 0);
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module_param(spia_fio_base, int, 0);
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module_param(spia_pedr, int, 0);
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module_param(spia_peddr, int, 0);
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/*
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* Define partitions for flash device
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*/
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static const struct mtd_partition partition_info[] = {
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{
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.name = "SPIA flash partition 1",
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.offset = 0,
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.size = 2 * 1024 * 1024},
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{
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.name = "SPIA flash partition 2",
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.offset = 2 * 1024 * 1024,
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.size = 6 * 1024 * 1024}
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};
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#define NUM_PARTITIONS 2
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/*
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* hardware specific access to control-lines
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*
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* ctrl:
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* NAND_CNE: bit 0 -> bit 2
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* NAND_CLE: bit 1 -> bit 0
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* NAND_ALE: bit 2 -> bit 1
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*/
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static void spia_hwcontrol(struct mtd_info *mtd, int cmd)
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{
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struct nand_chip *chip = mtd->priv;
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if (ctrl & NAND_CTRL_CHANGE) {
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void __iomem *addr = spia_io_base + spia_pedr;
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unsigned char bits;
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bits = (ctrl & NAND_CNE) << 2;
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bits |= (ctrl & NAND_CLE | NAND_ALE) >> 1;
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writeb((readb(addr) & ~0x7) | bits, addr);
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}
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if (cmd != NAND_CMD_NONE)
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writeb(cmd, chip->IO_ADDR_W);
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}
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/*
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* Main initialization routine
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*/
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static int __init spia_init(void)
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{
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struct nand_chip *this;
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/* Allocate memory for MTD device structure and private data */
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spia_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
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if (!spia_mtd) {
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printk("Unable to allocate SPIA NAND MTD device structure.\n");
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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 *)(&spia_mtd[1]);
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/* Initialize structures */
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memset(spia_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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spia_mtd->priv = this;
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spia_mtd->owner = THIS_MODULE;
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/*
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* Set GPIO Port E control register so that the pins are configured
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* to be outputs for controlling the NAND flash.
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*/
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(*(volatile unsigned char *)(spia_io_base + spia_peddr)) = 0x07;
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/* Set address of NAND IO lines */
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this->IO_ADDR_R = (void __iomem *)spia_fio_base;
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this->IO_ADDR_W = (void __iomem *)spia_fio_base;
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/* Set address of hardware control function */
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this->cmd_ctrl = spia_hwcontrol;
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/* 15 us command delay time */
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this->chip_delay = 15;
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/* Scan to find existence of the device */
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if (nand_scan(spia_mtd, 1)) {
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kfree(spia_mtd);
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return -ENXIO;
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}
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/* Register the partitions */
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mtd_device_register(spia_mtd, partition_info, NUM_PARTITIONS);
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/* Return happy */
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return 0;
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}
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module_init(spia_init);
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/*
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* Clean up routine
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*/
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static void __exit spia_cleanup(void)
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{
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/* Release resources, unregister device */
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nand_release(spia_mtd);
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/* Free the MTD device structure */
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kfree(spia_mtd);
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}
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module_exit(spia_cleanup);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com");
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MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");
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