/* *  drivers/mtd/nand/ams-delta.c * *  Copyright (C) 2006 Jonathan McDowell <noodles@earth.li> * *  Derived from drivers/mtd/toto.c * * 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 *   Amstrad E3 (Delta). */#include <linux/slab.h>#include <linux/init.h>#include <linux/module.h>#include <linux/delay.h>#include <linux/mtd/mtd.h>#include <linux/mtd/nand.h>#include <linux/mtd/partitions.h>#include <asm/io.h>#include <mach/hardware.h>#include <asm/sizes.h>#include <mach/gpio.h>#include <mach/board-ams-delta.h>/* * MTD structure for E3 (Delta) */static struct mtd_info *ams_delta_mtd = NULL;#define NAND_MASK (AMS_DELTA_LATCH2_NAND_NRE | AMS_DELTA_LATCH2_NAND_NWE | AMS_DELTA_LATCH2_NAND_CLE | AMS_DELTA_LATCH2_NAND_ALE | AMS_DELTA_LATCH2_NAND_NCE | AMS_DELTA_LATCH2_NAND_NWP)/* * Define partitions for flash devices */static struct mtd_partition partition_info[] = {	{ .name		= "Kernel",	  .offset	= 0,	  .size		= 3 * SZ_1M + SZ_512K },	{ .name		= "u-boot",	  .offset	= 3 * SZ_1M + SZ_512K,	  .size		= SZ_256K },	{ .name		= "u-boot params",	  .offset	= 3 * SZ_1M + SZ_512K + SZ_256K,	  .size		= SZ_256K },	{ .name		= "Amstrad LDR",	  .offset	= 4 * SZ_1M,	  .size		= SZ_256K },	{ .name		= "File system",	  .offset	= 4 * SZ_1M + 1 * SZ_256K,	  .size		= 27 * SZ_1M },	{ .name		= "PBL reserved",	  .offset	= 32 * SZ_1M - 3 * SZ_256K,	  .size		=  3 * SZ_256K },};static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte){	struct nand_chip *this = mtd->priv;	omap_writew(0, (OMAP_MPUIO_BASE + OMAP_MPUIO_IO_CNTL));	omap_writew(byte, this->IO_ADDR_W);	ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NWE, 0);	ndelay(40);	ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NWE,			       AMS_DELTA_LATCH2_NAND_NWE);}static u_char ams_delta_read_byte(struct mtd_info *mtd){	u_char res;	struct nand_chip *this = mtd->priv;	ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NRE, 0);	ndelay(40);	omap_writew(~0, (OMAP_MPUIO_BASE + OMAP_MPUIO_IO_CNTL));	res = omap_readw(this->IO_ADDR_R);	ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NRE,			       AMS_DELTA_LATCH2_NAND_NRE);	return res;}static void ams_delta_write_buf(struct mtd_info *mtd, const u_char *buf,				int len){	int i;	for (i=0; i<len; i++)		ams_delta_write_byte(mtd, buf[i]);}static void ams_delta_read_buf(struct mtd_info *mtd, u_char *buf, int len){	int i;	for (i=0; i<len; i++)		buf[i] = ams_delta_read_byte(mtd);}static int ams_delta_verify_buf(struct mtd_info *mtd, const u_char *buf,				int len){	int i;	for (i=0; i<len; i++)		if (buf[i] != ams_delta_read_byte(mtd))			return -EFAULT;	return 0;}/* * Command control function * * ctrl: * NAND_NCE: bit 0 -> bit 2 * NAND_CLE: bit 1 -> bit 7 * NAND_ALE: bit 2 -> bit 6 */static void ams_delta_hwcontrol(struct mtd_info *mtd, int cmd,				unsigned int ctrl){	if (ctrl & NAND_CTRL_CHANGE) {		unsigned long bits;		bits = (~ctrl & NAND_NCE) ? AMS_DELTA_LATCH2_NAND_NCE : 0;		bits |= (ctrl & NAND_CLE) ? AMS_DELTA_LATCH2_NAND_CLE : 0;		bits |= (ctrl & NAND_ALE) ? AMS_DELTA_LATCH2_NAND_ALE : 0;		ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_CLE |				AMS_DELTA_LATCH2_NAND_ALE |				AMS_DELTA_LATCH2_NAND_NCE, bits);	}	if (cmd != NAND_CMD_NONE)		ams_delta_write_byte(mtd, cmd);}static int ams_delta_nand_ready(struct mtd_info *mtd){	return gpio_get_value(AMS_DELTA_GPIO_PIN_NAND_RB);}/* * Main initialization routine */static int __init ams_delta_init(void){	struct nand_chip *this;	int err = 0;	/* Allocate memory for MTD device structure and private data */	ams_delta_mtd = kmalloc(sizeof(struct mtd_info) +				sizeof(struct nand_chip), GFP_KERNEL);	if (!ams_delta_mtd) {		printk (KERN_WARNING "Unable to allocate E3 NAND MTD device structure.\n");		err = -ENOMEM;		goto out;	}	ams_delta_mtd->owner = THIS_MODULE;	/* Get pointer to private data */	this = (struct nand_chip *) (&ams_delta_mtd[1]);	/* Initialize structures */	memset(ams_delta_mtd, 0, sizeof(struct mtd_info));	memset(this, 0, sizeof(struct nand_chip));	/* Link the private data with the MTD structure */	ams_delta_mtd->priv = this;	/* Set address of NAND IO lines */	this->IO_ADDR_R = (OMAP_MPUIO_BASE + OMAP_MPUIO_INPUT_LATCH);	this->IO_ADDR_W = (OMAP_MPUIO_BASE + OMAP_MPUIO_OUTPUT);	this->read_byte = ams_delta_read_byte;	this->write_buf = ams_delta_write_buf;	this->read_buf = ams_delta_read_buf;	this->verify_buf = ams_delta_verify_buf;	this->cmd_ctrl = ams_delta_hwcontrol;	if (gpio_request(AMS_DELTA_GPIO_PIN_NAND_RB, "nand_rdy") == 0) {		this->dev_ready = ams_delta_nand_ready;	} else {		this->dev_ready = NULL;		printk(KERN_NOTICE "Couldn't request gpio for Delta NAND ready.\n");	}	/* 25 us command delay time */	this->chip_delay = 30;	this->ecc.mode = NAND_ECC_SOFT;	/* Set chip enabled, but  */	ams_delta_latch2_write(NAND_MASK, AMS_DELTA_LATCH2_NAND_NRE |					  AMS_DELTA_LATCH2_NAND_NWE |					  AMS_DELTA_LATCH2_NAND_NCE |					  AMS_DELTA_LATCH2_NAND_NWP);	/* Scan to find existance of the device */	if (nand_scan(ams_delta_mtd, 1)) {		err = -ENXIO;		goto out_mtd;	}	/* Register the partitions */	add_mtd_partitions(ams_delta_mtd, partition_info,			   ARRAY_SIZE(partition_info));	goto out; out_mtd:	kfree(ams_delta_mtd); out:	return err;}module_init(ams_delta_init);/* * Clean up routine */static void __exit ams_delta_cleanup(void){	/* Release resources, unregister device */	nand_release(ams_delta_mtd);	/* Free the MTD device structure */	kfree(ams_delta_mtd);}module_exit(ams_delta_cleanup);MODULE_LICENSE("GPL");MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");MODULE_DESCRIPTION("Glue layer for NAND flash on Amstrad E3 (Delta)");