From 9819226a16a12ba0545e90b475fa70d408544971 Mon Sep 17 00:00:00 2001 From: Cliff Brake Date: Mon, 17 Dec 2007 16:45:47 -0500 Subject: [PATCH] gesbc-nand --- drivers/mtd/nand/Kconfig | 7 ++ drivers/mtd/nand/Makefile | 1 + drivers/mtd/nand/gesbc.c | 255 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 263 insertions(+), 0 deletions(-) create mode 100644 drivers/mtd/nand/gesbc.c diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig index 246d451..cde3146 100644 --- a/drivers/mtd/nand/Kconfig +++ b/drivers/mtd/nand/Kconfig @@ -51,6 +51,13 @@ config MTD_NAND_EDB7312 This enables the driver for the Cirrus Logic EBD7312 evaluation board to access the onboard NAND Flash. +config MTD_NAND_GESBC + tristate "Support for Glomation GESBC-93xx board" + depends on MTD_NAND && MACH_EDB9302 + help + This enables the driver for the Glomation GESBC-93xx + board to access the onboard NAND Flash. + config MTD_NAND_H1900 tristate "iPAQ H1900 flash" depends on ARCH_PXA && MTD_PARTITIONS diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile index 3ad6c01..58c1961 100644 --- a/drivers/mtd/nand/Makefile +++ b/drivers/mtd/nand/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_MTD_NAND_AMS_DELTA) += ams-delta.o obj-$(CONFIG_MTD_NAND_TOTO) += toto.o obj-$(CONFIG_MTD_NAND_AUTCPU12) += autcpu12.o obj-$(CONFIG_MTD_NAND_EDB7312) += edb7312.o +obj-$(CONFIG_MTD_NAND_GESBC) += gesbc.o obj-$(CONFIG_MTD_NAND_AU1550) += au1550nd.o obj-$(CONFIG_MTD_NAND_BF5XX) += bf5xx_nand.o obj-$(CONFIG_MTD_NAND_PPCHAMELEONEVB) += ppchameleonevb.o diff --git a/drivers/mtd/nand/gesbc.c b/drivers/mtd/nand/gesbc.c new file mode 100644 index 0000000..a5844b1 --- /dev/null +++ b/drivers/mtd/nand/gesbc.c @@ -0,0 +1,255 @@ +/* + * drivers/mtd/nand/gesbc-9302.c + * + * Copyright (C) 2004 Glomation (support@glomationinc.com) + * + * Derived from drivers/mtd/nand/edb7312.c + * Copyright (C) 2004 Marius Grer (mag@sysgo.de) + * + * Derived from drivers/mtd/nand/autcpu12.c + * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.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 + * GESBC-93xx board with Samsung 128/256/512 Mbyte part. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define GESBC_NAND_FLASH_DATA 0x10000000 + +#define GPIO_PADR EP93XX_GPIO_REG(0x0) +#define GPIO_PADDR EP93XX_GPIO_REG(0x10) +#define SMCBCR1 (EP93XX_AHB_VIRT_BASE + 0x00082000 + 0x04) + +/* + * MTD structure for GESBC-93xx board + */ +static struct mtd_info *gesbc_mtd = NULL; + + +/* + * Module stuff + */ +static unsigned long gesbc_fio_pbase = GESBC_NAND_FLASH_DATA; + +#ifdef CONFIG_MTD_PARTITIONS +/* + * Define static partitions for flash device + */ +static struct mtd_partition partition_info32[] = { + { .name= "GESBC NAND FLASH", + .offset= 0, + .size= 128*1024*1024 }, +}; +/* + * Define static partitions for flash device + */ +static struct mtd_partition partition_info128[] = { + { .name= "GESBC NAND FLASH", + .offset= 0, + .size= 128*1024*1024 }, +}; + +/* + * Define static partitions for flash device + */ +static struct mtd_partition partition_info256[] = { + { .name= "GESBC NAND FLASH", + .offset= 0, + .size= 256*1024*1024 }, +}; + +/* + * Define static partitions for flash device + */ +static struct mtd_partition partition_info512[] = { + { .name= "GESBC NAND FLASH", + .offset= 0, + .size= 512*1024*1024 }, +}; + +#define NUM_PARTITIONS 1 +#endif + + +/* + * hardware specific access to control-lines + * NAND_NCE: bit 0 -> bit 3 + * NAND_CLE: bit 1 -> bit 4 + * NAND_ALE: bit 2 -> bit 6 + */ +static void gesbc_hwcontrol(struct mtd_info *mtd, int cmd, int ctrl) +{ + unsigned long flags; + struct nand_chip *chip = mtd->priv; + + /* Disbale interrupt to avoid race condition */ + local_irq_save(flags); + + if (ctrl & NAND_CTRL_CHANGE) { + unsigned char bits; + + bits = (ctrl & NAND_CLE) << 3; + bits |= (ctrl & NAND_ALE) << 4; + if (ctrl & NAND_NCE) + bits &= ~0x08; + else + bits |= 0x08; + + __raw_writel( (__raw_readl(GPIO_PADR) & ~0x58 )| bits, GPIO_PADR); + } + if (cmd != NAND_CMD_NONE) + writeb(cmd, chip->IO_ADDR_W); + /* Restore interrupt state */ + local_irq_restore(flags); +} + +/* + * read device ready pin + */ +static int gesbc_device_ready(struct mtd_info *mtd) +{ + return (__raw_readl(GPIO_PADR) & 0x80) >> 7; +} + +#define MTDID "s3c2440-nand" + +static const char *probes[] = { "cmdlinepart", NULL }; + + + +/* + * Main initialization routine + */ +static int __init gesbc_nand_init (void) +{ + struct nand_chip *this; + const char *part_type = 0; + int mtd_parts_nb = 0; + struct mtd_partition *mtd_parts = 0; + unsigned long flags; + void * gesbc_fio_base; + + /* Allocate memory for MTD device structure and private data */ + gesbc_mtd = kmalloc(sizeof(struct mtd_info) + + sizeof(struct nand_chip), + GFP_KERNEL); + if (!gesbc_mtd) { + printk("Unable to allocate GESBC NAND MTD device structure.\n"); + return -ENOMEM; + } + + /* map physical adress */ + gesbc_fio_base = ioremap(gesbc_fio_pbase, SZ_1K); + if(!gesbc_fio_base) { + printk("ioremap GESBC-93xx NAND flash failed\n"); + kfree(gesbc_mtd); + return -EIO; + } + + + /* Get pointer to private data */ + this = (struct nand_chip *) (&gesbc_mtd[1]); + + /* Initialize structures */ + memset((char *) gesbc_mtd, 0, sizeof(struct mtd_info)); + memset((char *) this, 0, sizeof(struct nand_chip)); + + /* Link the private data with the MTD structure */ + gesbc_mtd->priv = this; + + /* Disbale interrupt to avoid race condition */ + local_irq_save(flags); + + /* + * Set GPIO Port A control register so that the pins are configured + * to be outputs for controlling the NAND flash. + */ + __raw_writel((__raw_readl(GPIO_PADDR) | 0x58) & ~0x80, GPIO_PADDR); + /* Clear NCE, clear CLE, clear ALE */ + __raw_writel( (__raw_readl(GPIO_PADR) | 0x08 ) & ~0x50, GPIO_PADR); + /* Set SRAM controller to 32 bit (8 bit just doesn't work, don't know why) bus width and 7 CLK wait state */ + __raw_writel(0x10003ce0, SMCBCR1); + local_irq_restore(flags); + + + /* insert callbacks */ + this->IO_ADDR_R = (void *) gesbc_fio_base; + this->IO_ADDR_W = (void *) gesbc_fio_base; + this->cmd_ctrl = (void *) gesbc_hwcontrol; + this->dev_ready = gesbc_device_ready; + this->chip_delay = 25; + this->ecc.mode = NAND_ECC_SOFT; + + __raw_writel(0xffffffff, gesbc_fio_base); + printk("Searching for NAND flash...\n"); + /* Scan to find existence of the device */ + if (nand_scan (gesbc_mtd, 1)) { + iounmap((void *)gesbc_fio_base); + kfree (gesbc_mtd); + return -ENXIO; + } + +#ifdef CONFIG_MTD_CMDLINE_PARTS + gesbc_mtd->name="GESBC-NAND"; + mtd_parts_nb = parse_mtd_partitions(gesbc_mtd, probes, &mtd_parts, 0); + if (mtd_parts_nb > 0) + part_type = "command line"; + else + mtd_parts_nb = 0; +#endif + + if (mtd_parts_nb == 0) + { + mtd_parts_nb = NUM_PARTITIONS; + mtd_parts = partition_info32; + if (gesbc_mtd->size >= (128 * 0x100000)) + mtd_parts = partition_info128; + if (gesbc_mtd->size >= (256 * 0x100000)) + mtd_parts = partition_info256; + if (gesbc_mtd->size >= (512 * 0x100000)) + mtd_parts = partition_info512; + part_type = "static"; + } + + /* Register the partitions */ + printk(KERN_NOTICE "Using %s partition definition\n", part_type); + add_mtd_partitions(gesbc_mtd, mtd_parts, mtd_parts_nb); + + /* Return happy */ + return 0; +} +module_init(gesbc_nand_init); + +/* + * Clean up routine + */ +static void __exit gesbc_nand_cleanup (void) +{ +/* struct nand_chip *this = (struct nand_chip *) &gesbc_mtd[1]; */ + + /* Unregister the device */ + del_mtd_device (gesbc_mtd); + + /* Free the MTD device structure */ + kfree (gesbc_mtd); +} +module_exit(gesbc_nand_cleanup); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("zql@glomationinc.com"); +MODULE_DESCRIPTION("MTD map driver for Glomation GESBC-93xx board"); + -- 1.5.2.5