autcpu12.c
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上传日期:2013-02-24
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- /*
- * drivers/mtd/autcpu12.c
- *
- * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
- *
- * Derived from drivers/mtd/spia.c
- * Copyright (C) 2000 Steven J. Hill (sjhill@cotw.com)
- *
- * $Id: autcpu12.c,v 1.3 2002/02/26 17:58:24 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
- * autronix autcpu12 board, which is a SmartMediaCard. It supports
- * 16MB, 32MB and 64MB cards.
- *
- * 02-12-2002 TG Cleanup of module params
- *
- * 02-20-2002 TG adjusted for different rd/wr adress support
- * added support for read device ready/busy line
- * added page_cache
- */
- #include <linux/slab.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>
- #include <asm/sizes.h>
- #include <asm/arch/autcpu12.h>
- /*
- * MTD structure for AUTCPU12 board
- */
- static struct mtd_info *autcpu12_mtd = NULL;
- /*
- * Module stuff
- */
- #if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
- #define autcpu12_init init_module
- #define autcpu12_cleanup cleanup_module
- #endif
- static int autcpu12_io_base = CS89712_VIRT_BASE;
- static int autcpu12_fio_pbase = AUTCPU12_PHYS_SMC;
- static int autcpu12_fio_ctrl = AUTCPU12_SMC_SELECT_OFFSET;
- static int autcpu12_pedr = AUTCPU12_SMC_PORT_OFFSET;
- static int autcpu12_fio_base;
- #ifdef MODULE
- MODULE_PARM(autcpu12_fio_pbase, "i");
- MODULE_PARM(autcpu12_fio_ctrl, "i");
- MODULE_PARM(autcpu12_pedr, "i");
- __setup("autcpu12_fio_pbase=",autcpu12_fio_pbase);
- __setup("autcpu12_fio_ctrl=",autcpu12_fio_ctrl);
- __setup("autcpu12_pedr=",autcpu12_pedr);
- #endif
- /*
- * Define partitions for flash devices
- */
- static struct mtd_partition partition_info16k[] = {
- { name: "AUTCPU12 flash partition 1",
- offset: 0,
- size: 8 * SZ_1M },
- { name: "AUTCPU12 flash partition 2",
- offset: 8 * SZ_1M,
- size: 8 * SZ_1M },
- };
- static struct mtd_partition partition_info32k[] = {
- { name: "AUTCPU12 flash partition 1",
- offset: 0,
- size: 16 * SZ_1M },
- { name: "AUTCPU12 flash partition 2",
- offset: 16 * SZ_1M,
- size: 24 * SZ_1M },
- };
- static struct mtd_partition partition_info64k[] = {
- { name: "AUTCPU12 flash partition 1",
- offset: 0,
- size: 16 * SZ_1M },
- { name: "AUTCPU12 flash partition 2",
- offset: 16 * SZ_1M,
- size: 48 * SZ_1M},
- };
- #define NUM_PARTITIONS16K 2
- #define NUM_PARTITIONS32K 3
- #define NUM_PARTITIONS64K 4
- /*
- * hardware specific access to control-lines
- */
- void autcpu12_hwcontrol(int cmd)
- {
- switch(cmd){
- case NAND_CTL_SETCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |= AUTCPU12_SMC_CLE; break;
- case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_CLE; break;
- case NAND_CTL_SETALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |= AUTCPU12_SMC_ALE; break;
- case NAND_CTL_CLRALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_ALE; break;
- case NAND_CTL_SETNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x01; break;
- case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x00; break;
- }
- }
- /*
- * read device ready pin
- */
- int autcpu12_device_ready(void)
- {
- return ( (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) & AUTCPU12_SMC_RDY) ? 1 : 0;
- }
- /*
- * Main initialization routine
- */
- int __init autcpu12_init (void)
- {
- struct nand_chip *this;
- int err = 0;
- /* Allocate memory for MTD device structure and private data */
- autcpu12_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
- GFP_KERNEL);
- if (!autcpu12_mtd) {
- printk ("Unable to allocate AUTCPU12 NAND MTD device structure.n");
- err = -ENOMEM;
- goto out;
- }
- /* map physical adress */
- autcpu12_fio_base=(unsigned long)ioremap(autcpu12_fio_pbase,SZ_1K);
- if(!autcpu12_fio_base){
- printk("Ioremap autcpu12 SmartMedia Card failedn");
- err = -EIO;
- goto out_mtd;
- }
- /* Get pointer to private data */
- this = (struct nand_chip *) (&autcpu12_mtd[1]);
- /* Initialize structures */
- memset((char *) autcpu12_mtd, 0, sizeof(struct mtd_info));
- memset((char *) this, 0, sizeof(struct nand_chip));
- /* Link the private data with the MTD structure */
- autcpu12_mtd->priv = this;
- /* Set address of NAND IO lines */
- this->IO_ADDR_R = autcpu12_fio_base;
- this->IO_ADDR_W = autcpu12_fio_base;
- this->hwcontrol = autcpu12_hwcontrol;
- this->dev_ready = autcpu12_device_ready;
- /* 20 us command delay time */
- this->chip_delay = 20;
- /* Scan to find existance of the device */
- if (nand_scan (autcpu12_mtd)) {
- err = -ENXIO;
- goto out_ior;
- }
- /* Allocate memory for internal data buffer */
- this->data_buf = kmalloc (sizeof(u_char) * (autcpu12_mtd->oobblock + autcpu12_mtd->oobsize), GFP_KERNEL);
- if (!this->data_buf) {
- printk ("Unable to allocate NAND data buffer for AUTCPU12.n");
- err = -ENOMEM;
- goto out_ior;
- }
- /* Allocate memory for internal data buffer */
- this->data_cache = kmalloc (sizeof(u_char) * (autcpu12_mtd->oobblock + autcpu12_mtd->oobsize), GFP_KERNEL);
- if (!this->data_cache) {
- printk ("Unable to allocate NAND data cache for AUTCPU12.n");
- err = -ENOMEM;
- goto out_buf;
- }
- this->cache_page = -1;
- /* Register the partitions */
- switch(autcpu12_mtd->size){
- case SZ_16M: add_mtd_partitions(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break;
- case SZ_32M: add_mtd_partitions(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break;
- case SZ_64M: add_mtd_partitions(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break;
- default: {
- printk ("Unsupported SmartMedia devicen");
- err = -ENXIO;
- goto out_cac;
- }
- }
- goto out;
- out_cac:
- kfree (this->data_cache);
- out_buf:
- kfree (this->data_buf);
- out_ior:
- iounmap((void *)autcpu12_fio_base);
- out_mtd:
- kfree (autcpu12_mtd);
- out:
- return err;
- }
- module_init(autcpu12_init);
- /*
- * Clean up routine
- */
- #ifdef MODULE
- static void __exit autcpu12_cleanup (void)
- {
- struct nand_chip *this = (struct nand_chip *) &autcpu12_mtd[1];
- /* Unregister partitions */
- del_mtd_partitions(autcpu12_mtd);
-
- /* Unregister the device */
- del_mtd_device (autcpu12_mtd);
- /* Free internal data buffers */
- kfree (this->data_buf);
- kfree (this->data_cache);
- /* unmap physical adress */
- iounmap((void *)autcpu12_fio_base);
- /* Free the MTD device structure */
- kfree (autcpu12_mtd);
- }
- module_exit(autcpu12_cleanup);
- #endif
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Thomas Gleixner <gleixner@autronix.de>");
- MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");