drivers/mtd/nand/h1910.c

   1 /*
   2  *  drivers/mtd/nand/h1910.c
   3  *
   4  *  Copyright (C) 2003 Joshua Wise (joshua@joshuawise.com)
   5  *
   6  *  Derived from drivers/mtd/nand/edb7312.c
   7  *       Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
   8  *       Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
   9  *
  10  * $Id: h1910.c,v 1.6 2005/11/07 11:14:30 gleixner Exp $
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  *  Overview:
  17  *   This is a device driver for the NAND flash device found on the
  18  *   iPAQ h1910 board which utilizes the Samsung K9F2808 part. This is
  19  *   a 128Mibit (16MiB x 8 bits) NAND flash device.
  20  */
  21
  22 #include <linux/slab.h>
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/mtd/nand.h>
  27 #include <linux/mtd/partitions.h>
  28 #include <asm/io.h>
  29 #include <asm/arch/hardware.h>  /* for CLPS7111_VIRT_BASE */
  30 #include <asm/sizes.h>
  31 #include <asm/arch/h1900-gpio.h>
  32 #include <asm/arch/ipaq.h>
  33
  34 /*
  35  * MTD structure for EDB7312 board
  36  */
  37 static struct mtd_info *h1910_nand_mtd = NULL;
  38
  39 /*
  40  * Module stuff
  41  */
  42
  43 #ifdef CONFIG_MTD_PARTITIONS
  44 /*
  45  * Define static partitions for flash device
  46  */
  47 static struct mtd_partition partition_info[] = {
  48       {name:"h1910 NAND Flash",
  49               offset:0,
  50       size:16 * 1024 * 1024}
  51 };
  52
  53 #define NUM_PARTITIONS 1
  54
  55 #endif
  56
  57 /*
  58  *      hardware specific access to control-lines
  59  *
  60  *      NAND_NCE: bit 0 - don't care
  61  *      NAND_CLE: bit 1 - address bit 2
  62  *      NAND_ALE: bit 2 - address bit 3
  63  */
  64 static void h1910_hwcontrol(struct mtd_info *mtd, int cmd,
  65                             unsigned int ctrl)
  66 {
  67         struct nand_chip *chip = mtd->priv;
  68
  69         if (cmd != NAND_CMD_NONE)
  70                 writeb(cmd, chip->IO_ADDR_W | ((ctrl & 0x6) << 1));
  71 }
  72
  73 /*
  74  *      read device ready pin
  75  */
  76 #if 0
  77 static int h1910_device_ready(struct mtd_info *mtd)
  78 {
  79         return (GPLR(55) & GPIO_bit(55));
  80 }
  81 #endif
  82
  83 /*
  84  * Main initialization routine
  85  */
  86 static int __init h1910_init(void)
  87 {
  88         struct nand_chip *this;
  89         const char *part_type = 0;
  90         int mtd_parts_nb = 0;
  91         struct mtd_partition *mtd_parts = 0;
  92         void __iomem *nandaddr;
  93
  94         if (!machine_is_h1900())
  95                 return -ENODEV;
  96
  97         nandaddr = ioremap(0x08000000, 0x1000);
  98         if (!nandaddr) {
  99                 printk("Failed to ioremap nand flash.\n");
 100                 return -ENOMEM;
 101         }
 102
 103         /* Allocate memory for MTD device structure and private data */
 104         h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 105         if (!h1910_nand_mtd) {
 106                 printk("Unable to allocate h1910 NAND MTD device structure.\n");
 107                 iounmap((void *)nandaddr);
 108                 return -ENOMEM;
 109         }
 110
 111         /* Get pointer to private data */
 112         this = (struct nand_chip *)(&h1910_nand_mtd[1]);
 113
 114         /* Initialize structures */
 115         memset(h1910_nand_mtd, 0, sizeof(struct mtd_info));
 116         memset(this, 0, sizeof(struct nand_chip));
 117
 118         /* Link the private data with the MTD structure */
 119         h1910_nand_mtd->priv = this;
 120         h1910_nand_mtd->owner = THIS_MODULE;
 121
 122         /*
 123          * Enable VPEN
 124          */
 125         GPSR(37) = GPIO_bit(37);
 126
 127         /* insert callbacks */
 128         this->IO_ADDR_R = nandaddr;
 129         this->IO_ADDR_W = nandaddr;
 130         this->cmd_ctrl = h1910_hwcontrol;
 131         this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */
 132         /* 15 us command delay time */
 133         this->chip_delay = 50;
 134         this->ecc.mode = NAND_ECC_SOFT;
 135         this->options = NAND_NO_AUTOINCR;
 136
 137         /* Scan to find existence of the device */
 138         if (nand_scan(h1910_nand_mtd, 1)) {
 139                 printk(KERN_NOTICE "No NAND device - returning -ENXIO\n");
 140                 kfree(h1910_nand_mtd);
 141                 iounmap((void *)nandaddr);
 142                 return -ENXIO;
 143         }
 144 #ifdef CONFIG_MTD_CMDLINE_PARTS
 145         mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts, "h1910-nand");
 146         if (mtd_parts_nb > 0)
 147                 part_type = "command line";
 148         else
 149                 mtd_parts_nb = 0;
 150 #endif
 151         if (mtd_parts_nb == 0) {
 152                 mtd_parts = partition_info;
 153                 mtd_parts_nb = NUM_PARTITIONS;
 154                 part_type = "static";
 155         }
 156
 157         /* Register the partitions */
 158         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 159         add_mtd_partitions(h1910_nand_mtd, mtd_parts, mtd_parts_nb);
 160
 161         /* Return happy */
 162         return 0;
 163 }
 164
 165 module_init(h1910_init);
 166
 167 /*
 168  * Clean up routine
 169  */
 170 static void __exit h1910_cleanup(void)
 171 {
 172         struct nand_chip *this = (struct nand_chip *)&h1910_nand_mtd[1];
 173
 174         /* Release resources, unregister device */
 175         nand_release(h1910_nand_mtd);
 176
 177         /* Release io resource */
 178         iounmap((void *)this->IO_ADDR_W);
 179
 180         /* Free the MTD device structure */
 181         kfree(h1910_nand_mtd);
 182 }
 183
 184 module_exit(h1910_cleanup);
 185
 186 MODULE_LICENSE("GPL");
 187 MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");
 188 MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");