--- /dev/null
+/*
+ * 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 1.2 2003/10/21 10:04:58 dwmw2 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>
+
+/*
+ * MTD structure for TOTO board
+ */
+static struct mtd_info *toto_mtd = NULL;
+
+static int toto_io_base = OMAP_FLASH_1_BASE;
+
+#define CONFIG_NAND_WORKAROUND 1
+
+#define NAND_NCE 0x4000
+#define NAND_CLE 0x1000
+#define NAND_ALE 0x0002
+#define NAND_MASK (NAND_CLE | NAND_ALE | NAND_NCE)
+
+#define T_NAND_CTL_CLRALE(iob) gpiosetout(NAND_ALE, 0)
+#define T_NAND_CTL_SETALE(iob) gpiosetout(NAND_ALE, NAND_ALE)
+#ifdef CONFIG_NAND_WORKAROUND /* "some" dev boards busted, blue wired to rts2 :( */
+#define T_NAND_CTL_CLRCLE(iob) gpiosetout(NAND_CLE, 0); rts2setout(2, 2)
+#define T_NAND_CTL_SETCLE(iob) gpiosetout(NAND_CLE, NAND_CLE); rts2setout(2, 0)
+#else
+#define T_NAND_CTL_CLRCLE(iob) gpiosetout(NAND_CLE, 0)
+#define T_NAND_CTL_SETCLE(iob) gpiosetout(NAND_CLE, NAND_CLE)
+#endif
+#define T_NAND_CTL_SETNCE(iob) gpiosetout(NAND_NCE, 0)
+#define T_NAND_CTL_CLRNCE(iob) gpiosetout(NAND_NCE, NAND_NCE)
+
+/*
+ * 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
+*/
+
+static void toto_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+
+ udelay(1); /* hopefully enough time for tc make proceding write to clear */
+ switch(cmd){
+
+ case NAND_CTL_SETCLE: T_NAND_CTL_SETCLE(cmd); break;
+ case NAND_CTL_CLRCLE: T_NAND_CTL_CLRCLE(cmd); break;
+
+ case NAND_CTL_SETALE: T_NAND_CTL_SETALE(cmd); break;
+ case NAND_CTL_CLRALE: T_NAND_CTL_CLRALE(cmd); break;
+
+ case NAND_CTL_SETNCE: T_NAND_CTL_SETNCE(cmd); break;
+ case NAND_CTL_CLRNCE: T_NAND_CTL_CLRNCE(cmd); break;
+ }
+ udelay(1); /* allow time to ensure gpio state to over take memory write */
+}
+
+/*
+ * Main initialization routine
+ */
+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((char *) toto_mtd, 0, sizeof(struct mtd_info));
+ memset((char *) this, 0, sizeof(struct nand_chip));
+
+ /* Link the private data with the MTD structure */
+ toto_mtd->priv = this;
+
+ /* Set address of NAND IO lines */
+ this->IO_ADDR_R = toto_io_base;
+ this->IO_ADDR_W = toto_io_base;
+ this->hwcontrol = toto_hwcontrol;
+ this->dev_ready = NULL;
+ /* 25 us command delay time */
+ this->chip_delay = 30;
+ this->eccmode = NAND_ECC_SOFT;
+
+ /* Scan to find existance of the device */
+ if (nand_scan (toto_mtd, 1)) {
+ err = -ENXIO;
+ goto out_mtd;
+ }
+
+ /* Allocate memory for internal data buffer */
+ this->data_buf = kmalloc (sizeof(u_char) * (toto_mtd->oobblock + toto_mtd->oobsize), GFP_KERNEL);
+ if (!this->data_buf) {
+ printk (KERN_WARNING "Unable to allocate NAND data buffer for toto.\n");
+ err = -ENOMEM;
+ 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_buf:
+ kfree (this->data_buf);
+out_mtd:
+ kfree (toto_mtd);
+out:
+ return err;
+}
+
+module_init(toto_init);
+
+/*
+ * Clean up routine
+ */
+static void __exit toto_cleanup (void)
+{
+ struct nand_chip *this = (struct nand_chip *) &toto_mtd[1];
+
+ /* Unregister partitions */
+ del_mtd_partitions(toto_mtd);
+
+ /* Unregister the device */
+ del_mtd_device (toto_mtd);
+
+ /* Free internal data buffers */
+ kfree (this->data_buf);
+
+ /* 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");
git://git.onelab.eu / linux-2.6.git / blobdiff