/* * drivers/mtd/autcpu12.c * * Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de> * * Derived from drivers/mtd/spia.c * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) * * 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 * 16MiB, 32MiB and 64MiB cards. * * * 02-12-2002 TG Cleanup of module params * * 02-20-2002 TG adjusted for different rd/wr address support * added support for read device ready/busy line * added page_cache * * 10-06-2002 TG 128K card support added */ #include <linux/slab.h> #include <linux/init.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 <mach/hardware.h> #include <asm/sizes.h> #include <mach/autcpu12.h> /* * MTD structure for AUTCPU12 board */ static struct mtd_info *autcpu12_mtd = NULL; static void __iomem *autcpu12_fio_base; /* * 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 = 8 * SZ_1M }, { .name = "AUTCPU12 flash partition 2", .offset = 8 * 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 }, }; static struct mtd_partition partition_info128k[] = { { .name = "AUTCPU12 flash partition 1", .offset = 0, .size = 16 * SZ_1M }, { .name = "AUTCPU12 flash partition 2", .offset = 16 * SZ_1M, .size = 112 * SZ_1M }, }; #define NUM_PARTITIONS16K 2 #define NUM_PARTITIONS32K 2 #define NUM_PARTITIONS64K 2 #define NUM_PARTITIONS128K 2 /* * hardware specific access to control-lines * * ALE bit 4 autcpu12_pedr * CLE bit 5 autcpu12_pedr * NCE bit 0 fio_ctrl * */ static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) { struct nand_chip *chip = mtd->priv; if (ctrl & NAND_CTRL_CHANGE) { void __iomem *addr; unsigned char bits; addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET; bits = (ctrl & NAND_CLE) << 4; bits |= (ctrl & NAND_ALE) << 2; writeb((readb(addr) & ~0x30) | bits, addr); addr = autcpu12_fio_base + AUTCPU12_SMC_SELECT_OFFSET; writeb((readb(addr) & ~0x1) | (ctrl & NAND_NCE), addr); } if (cmd != NAND_CMD_NONE) writeb(cmd, chip->IO_ADDR_W); } /* * read device ready pin */ int autcpu12_device_ready(struct mtd_info *mtd) { void __iomem *addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET; return readb(addr) & AUTCPU12_SMC_RDY; } /* * Main initialization routine */ static 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 address */ autcpu12_fio_base = ioremap(AUTCPU12_PHYS_SMC, SZ_1K); if (!autcpu12_fio_base) { printk("Ioremap autcpu12 SmartMedia Card failed\n"); err = -EIO; goto out_mtd; } /* Get pointer to private data */ this = (struct nand_chip *)(&autcpu12_mtd[1]); /* Initialize structures */ memset(autcpu12_mtd, 0, sizeof(struct mtd_info)); memset(this, 0, sizeof(struct nand_chip)); /* Link the private data with the MTD structure */ autcpu12_mtd->priv = this; autcpu12_mtd->owner = THIS_MODULE; /* Set address of NAND IO lines */ this->IO_ADDR_R = autcpu12_fio_base; this->IO_ADDR_W = autcpu12_fio_base; this->cmd_ctrl = autcpu12_hwcontrol; this->dev_ready = autcpu12_device_ready; /* 20 us command delay time */ this->chip_delay = 20; this->ecc.mode = NAND_ECC_SOFT; /* Enable the following for a flash based bad block table */ /* this->bbt_options = NAND_BBT_USE_FLASH; */ this->bbt_options = NAND_BBT_USE_FLASH; /* Scan to find existence of the device */ if (nand_scan(autcpu12_mtd, 1)) { err = -ENXIO; goto out_ior; } /* Register the partitions */ switch (autcpu12_mtd->size) { case SZ_16M: mtd_device_register(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break; case SZ_32M: mtd_device_register(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break; case SZ_64M: mtd_device_register(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break; case SZ_128M: mtd_device_register(autcpu12_mtd, partition_info128k, NUM_PARTITIONS128K); break; default: printk("Unsupported SmartMedia device\n"); err = -ENXIO; goto out_ior; } goto out; out_ior: iounmap(autcpu12_fio_base); out_mtd: kfree(autcpu12_mtd); out: return err; } module_init(autcpu12_init); /* * Clean up routine */ static void __exit autcpu12_cleanup(void) { /* Release resources, unregister device */ nand_release(autcpu12_mtd); /* unmap physical address */ iounmap(autcpu12_fio_base); /* Free the MTD device structure */ kfree(autcpu12_mtd); } module_exit(autcpu12_cleanup); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>"); MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");