205 lines
4.7 KiB
C
205 lines
4.7 KiB
C
/*
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* drivers/mtd/nand/ts7250.c
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*
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* Copyright (C) 2004 Technologic Systems (support@embeddedARM.com)
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*
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* Derived from drivers/mtd/nand/edb7312.c
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* Copyright (C) 2004 Marius Gröger (mag@sysgo.de)
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*
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* Derived from drivers/mtd/nand/autcpu12.c
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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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* TS-7250 board which utilizes a Samsung 32 Mbyte part.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.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>
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#include <asm/sizes.h>
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#include <asm/mach-types.h>
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/*
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* MTD structure for TS7250 board
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*/
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static struct mtd_info *ts7250_mtd = NULL;
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#ifdef CONFIG_MTD_PARTITIONS
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static const char *part_probes[] = { "cmdlinepart", NULL };
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#define NUM_PARTITIONS 3
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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_info32[] = {
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{
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.name = "TS-BOOTROM",
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.offset = 0x00000000,
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.size = 0x00004000,
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}, {
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.name = "Linux",
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.offset = 0x00004000,
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.size = 0x01d00000,
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}, {
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.name = "RedBoot",
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.offset = 0x01d04000,
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.size = 0x002fc000,
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},
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};
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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_info128[] = {
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{
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.name = "TS-BOOTROM",
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.offset = 0x00000000,
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.size = 0x00004000,
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}, {
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.name = "Linux",
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.offset = 0x00004000,
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.size = 0x07d00000,
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}, {
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.name = "RedBoot",
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.offset = 0x07d04000,
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.size = 0x002fc000,
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},
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};
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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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* ctrl:
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* NAND_NCE: bit 0 -> bit 2
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* NAND_CLE: bit 1 -> bit 1
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* NAND_ALE: bit 2 -> bit 0
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*/
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static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
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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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unsigned long addr = TS72XX_NAND_CONTROL_VIRT_BASE;
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unsigned char bits;
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bits = (ctrl & NAND_NCE) << 2;
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bits |= ctrl & NAND_CLE;
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bits |= (ctrl & NAND_ALE) >> 2;
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__raw_writeb((__raw_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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* read device ready pin
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*/
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static int ts7250_device_ready(struct mtd_info *mtd)
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{
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return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
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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 ts7250_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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if (!machine_is_ts72xx() || board_is_ts7200())
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return -ENXIO;
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/* Allocate memory for MTD device structure and private data */
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ts7250_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
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if (!ts7250_mtd) {
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printk("Unable to allocate TS7250 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 *)(&ts7250_mtd[1]);
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/* Initialize structures */
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memset(ts7250_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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ts7250_mtd->priv = this;
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ts7250_mtd->owner = THIS_MODULE;
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/* insert callbacks */
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this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
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this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
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this->cmd_ctrl = ts7250_hwcontrol;
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this->dev_ready = ts7250_device_ready;
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this->chip_delay = 15;
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this->ecc.mode = NAND_ECC_SOFT;
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printk("Searching for NAND flash...\n");
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/* Scan to find existence of the device */
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if (nand_scan(ts7250_mtd, 1)) {
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kfree(ts7250_mtd);
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return -ENXIO;
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}
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#ifdef CONFIG_MTD_PARTITIONS
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ts7250_mtd->name = "ts7250-nand";
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mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes, &mtd_parts, 0);
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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_info32;
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if (ts7250_mtd->size >= (128 * 0x100000))
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mtd_parts = partition_info128;
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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(ts7250_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(ts7250_init);
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/*
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* Clean up routine
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*/
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static void __exit ts7250_cleanup(void)
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{
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/* Unregister the device */
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del_mtd_device(ts7250_mtd);
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/* Free the MTD device structure */
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kfree(ts7250_mtd);
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}
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module_exit(ts7250_cleanup);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
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MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");
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