litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'include/linux/compiler-gcc3.h')

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/* * drivers/mtd/nand/toto.c * * Copyright (c) 2003 Texas Instruments * * Derived from drivers/mtd/autcpu12.c * * Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de> * * 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 * TI fido board. It supports 32MiB and 64MiB cards * * $Id: toto.c,v 1.5 2005/11/07 11:14:31 gleixner Exp $ */ #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 <asm/arch/hardware.h> #include <asm/sizes.h> #include <asm/arch/toto.h> #include <asm/arch-omap1510/hardware.h> #include <asm/arch/gpio.h> #define CONFIG_NAND_WORKAROUND 1 /* * MTD structure for TOTO board */ static struct mtd_info *toto_mtd = NULL; static unsigned long toto_io_base = OMAP_FLASH_1_BASE; /* * Define partitions for flash devices */ static struct mtd_partition partition_info64M[] = { { .name = "toto kernel partition 1", .offset = 0, .size = 2 * SZ_1M }, { .name = "toto file sys partition 2", .offset = 2 * SZ_1M, .size = 14 * SZ_1M }, { .name = "toto user partition 3", .offset = 16 * SZ_1M, .size = 16 * SZ_1M }, { .name = "toto devboard extra partition 4", .offset = 32 * SZ_1M, .size = 32 * SZ_1M }, }; static struct mtd_partition partition_info32M[] = { { .name = "toto kernel partition 1", .offset = 0, .size = 2 * SZ_1M }, { .name = "toto file sys partition 2", .offset = 2 * SZ_1M, .size = 14 * SZ_1M }, { .name = "toto user partition 3", .offset = 16 * SZ_1M, .size = 16 * SZ_1M }, }; #define NUM_PARTITIONS32M 3 #define NUM_PARTITIONS64M 4 /* * hardware specific access to control-lines * * ctrl: * NAND_NCE: bit 0 -> bit 14 (0x4000) * NAND_CLE: bit 1 -> bit 12 (0x1000) * NAND_ALE: bit 2 -> bit 1 (0x0002) */ static void toto_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) { struct nand_chip *chip = mtd->priv; if (ctrl & NAND_CTRL_CHANGE) { unsigned long bits; /* hopefully enough time for tc make proceding write to clear */ udelay(1); bits = (~ctrl & NAND_NCE) << 14; bits |= (ctrl & NAND_CLE) << 12; bits |= (ctrl & NAND_ALE) >> 1; #warning Wild guess as gpiosetout() is nowhere defined in the kernel source - tglx gpiosetout(0x5002, bits); #ifdef CONFIG_NAND_WORKAROUND /* "some" dev boards busted, blue wired to rts2 :( */ rts2setout(2, (ctrl & NAND_CLE) << 1); #endif /* allow time to ensure gpio state to over take memory write */ udelay(1); } if (cmd != NAND_CMD_NONE) writeb(cmd, chip->IO_ADDR_W); } /* * Main initialization routine */ static int __init toto_init(void) { struct nand_chip *this; int err = 0; /* Allocate memory for MTD device structure and private data */ toto_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL); if (!toto_mtd) { printk(KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n"); err = -ENOMEM; goto out; } /* Get pointer to private data */ this = (struct nand_chip *)(&toto_mtd[1]); /* Initialize structures */ memset(toto_mtd, 0, sizeof(struct mtd_info)); memset(this, 0, sizeof(struct nand_chip)); /* Link the private data with the MTD structure */ toto_mtd->priv = this; toto_mtd->owner = THIS_MODULE; /* Set address of NAND IO lines */ this->IO_ADDR_R = toto_io_base; this->IO_ADDR_W = toto_io_base; this->cmd_ctrl = toto_hwcontrol; this->dev_ready = NULL; /* 25 us command delay time */ this->chip_delay = 30; this->ecc.mode = NAND_ECC_SOFT; /* Scan to find existance of the device */ if (nand_scan(toto_mtd, 1)) { err = -ENXIO; goto out_mtd; } /* Register the partitions */ switch (toto_mtd->size) { case SZ_64M: add_mtd_partitions(toto_mtd, partition_info64M, NUM_PARTITIONS64M); break; case SZ_32M: add_mtd_partitions(toto_mtd, partition_info32M, NUM_PARTITIONS32M); break; default:{ printk(KERN_WARNING "Unsupported Nand device\n"); err = -ENXIO; goto out_buf; } } gpioreserve(NAND_MASK); /* claim our gpios */ archflashwp(0, 0); /* open up flash for writing */ goto out; out_mtd: kfree(toto_mtd); out: return err; } module_init(toto_init); /* * Clean up routine */ static void __exit toto_cleanup(void) { /* Release resources, unregister device */ nand_release(toto_mtd); /* Free the MTD device structure */ kfree(toto_mtd); /* stop flash writes */ archflashwp(0, 1); /* release gpios to system */ gpiorelease(NAND_MASK); } module_exit(toto_cleanup); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>"); MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");


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