1 files changed, 218 insertions, 0 deletions

diff --git a/drivers/mtd/nand/edb7312.c b/drivers/mtd/nand/edb7312.c
new file mode 100644
index 000000000000..5549681ccdce
--- /dev/null
+++ b/drivers/mtd/nand/edb7312.c
@@ -0,0 +1,218 @@
+/*
+ *  drivers/mtd/nand/edb7312.c
+ *
+ *  Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
+ *
+ *  Derived from drivers/mtd/nand/autcpu12.c
+ *       Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
+ *
+ * $Id: edb7312.c,v 1.11 2004/11/04 12:53:10 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
+ *   CLEP7312 board which utilizes the Toshiba TC58V64AFT part. This is
+ *   a 64Mibit (8MiB x 8 bits) NAND flash device.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.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> /* for CLPS7111_VIRT_BASE */
+#include <asm/sizes.h>
+#include <asm/hardware/clps7111.h>
+
+/*
+ * MTD structure for EDB7312 board
+ */
+static struct mtd_info *ep7312_mtd = NULL;
+
+/*
+ * Values specific to the EDB7312 board (used with EP7312 processor)
+ */
+#define EP7312_FIO_PBASE 0x10000000     /* Phys address of flash */
+#define EP7312_PXDR     0x0001  /*
+                                 * IO offset to Port B data register
+                                 * where the CLE, ALE and NCE pins
+                                 * are wired to.
+                                 */
+#define EP7312_PXDDR    0x0041  /*
+                                 * IO offset to Port B data direction
+                                 * register so we can control the IO
+                                 * lines.
+                                 */
+
+/*
+ * Module stuff
+ */
+
+static unsigned long ep7312_fio_pbase = EP7312_FIO_PBASE;
+static void __iomem * ep7312_pxdr = (void __iomem *) EP7312_PXDR;
+static void __iomem * ep7312_pxddr = (void __iomem *) EP7312_PXDDR;
+
+#ifdef CONFIG_MTD_PARTITIONS
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info[] = {
+        { .name = "EP7312 Nand Flash",
+                  .offset = 0,
+                  .size = 8*1024*1024 }
+};
+#define NUM_PARTITIONS 1
+
+#endif
+
+
+/* 
+ *      hardware specific access to control-lines
+ */
+static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd) 
+{
+        switch(cmd) {
+                
+        case NAND_CTL_SETCLE: 
+                clps_writeb(clps_readb(ep7312_pxdr) | 0x10, ep7312_pxdr); 
+                break;
+        case NAND_CTL_CLRCLE: 
+                clps_writeb(clps_readb(ep7312_pxdr) & ~0x10, ep7312_pxdr);
+                break;
+                
+        case NAND_CTL_SETALE:
+                clps_writeb(clps_readb(ep7312_pxdr) | 0x20, ep7312_pxdr);
+                break;
+        case NAND_CTL_CLRALE:
+                clps_writeb(clps_readb(ep7312_pxdr) & ~0x20, ep7312_pxdr);
+                break;
+                
+        case NAND_CTL_SETNCE:
+                clps_writeb((clps_readb(ep7312_pxdr) | 0x80) & ~0x40, ep7312_pxdr);
+                break;
+        case NAND_CTL_CLRNCE:
+                clps_writeb((clps_readb(ep7312_pxdr) | 0x80) | 0x40, ep7312_pxdr);
+                break;
+        }
+}
+
+/*
+ *      read device ready pin
+ */
+static int ep7312_device_ready(struct mtd_info *mtd)
+{
+        return 1;
+}
+#ifdef CONFIG_MTD_PARTITIONS
+const char *part_probes[] = { "cmdlinepart", NULL };
+#endif
+
+/*
+ * Main initialization routine
+ */
+static int __init ep7312_init (void)
+{
+        struct nand_chip *this;
+        const char *part_type = 0;
+        int mtd_parts_nb = 0;
+        struct mtd_partition *mtd_parts = 0;
+        void __iomem * ep7312_fio_base;
+        
+        /* Allocate memory for MTD device structure and private data */
+        ep7312_mtd = kmalloc(sizeof(struct mtd_info) + 
+                             sizeof(struct nand_chip),
+                             GFP_KERNEL);
+        if (!ep7312_mtd) {
+                printk("Unable to allocate EDB7312 NAND MTD device structure.\n");
+                return -ENOMEM;
+        }
+        
+        /* map physical adress */
+        ep7312_fio_base = ioremap(ep7312_fio_pbase, SZ_1K);
+        if(!ep7312_fio_base) {
+                printk("ioremap EDB7312 NAND flash failed\n");
+                kfree(ep7312_mtd);
+                return -EIO;
+        }
+        
+        /* Get pointer to private data */
+        this = (struct nand_chip *) (&ep7312_mtd[1]);
+        
+        /* Initialize structures */
+        memset((char *) ep7312_mtd, 0, sizeof(struct mtd_info));
+        memset((char *) this, 0, sizeof(struct nand_chip));
+        
+        /* Link the private data with the MTD structure */
+        ep7312_mtd->priv = this;
+        
+        /*
+         * Set GPIO Port B control register so that the pins are configured
+         * to be outputs for controlling the NAND flash.
+         */
+        clps_writeb(0xf0, ep7312_pxddr);
+        
+        /* insert callbacks */
+        this->IO_ADDR_R = ep7312_fio_base;
+        this->IO_ADDR_W = ep7312_fio_base;
+        this->hwcontrol = ep7312_hwcontrol;
+        this->dev_ready = ep7312_device_ready;
+        /* 15 us command delay time */
+        this->chip_delay = 15;
+        
+        /* Scan to find existence of the device */
+        if (nand_scan (ep7312_mtd, 1)) {
+                iounmap((void *)ep7312_fio_base);
+                kfree (ep7312_mtd);
+                return -ENXIO;
+        }
+        
+#ifdef CONFIG_MTD_PARTITIONS
+        ep7312_mtd->name = "edb7312-nand";
+        mtd_parts_nb = parse_mtd_partitions(ep7312_mtd, part_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 = partition_info;
+                mtd_parts_nb = NUM_PARTITIONS;
+                part_type = "static";
+        }
+        
+        /* Register the partitions */
+        printk(KERN_NOTICE "Using %s partition definition\n", part_type);
+        add_mtd_partitions(ep7312_mtd, mtd_parts, mtd_parts_nb);
+        
+        /* Return happy */
+        return 0;
+}
+module_init(ep7312_init);
+
+/*
+ * Clean up routine
+ */
+static void __exit ep7312_cleanup (void)
+{
+        struct nand_chip *this = (struct nand_chip *) &ep7312_mtd[1];
+        
+        /* Release resources, unregister device */
+        nand_release (ap7312_mtd);
+        
+        /* Free internal data buffer */
+        kfree (this->data_buf);
+        
+        /* Free the MTD device structure */
+        kfree (ep7312_mtd);
+}
+module_exit(ep7312_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
+MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");