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 1.5 2004/11/04 12:53:10 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 #define NUM_PARTITIONS 1
  53
  54 #endif
  55
  56
  57 /*
  58  *      hardware specific access to control-lines
  59  */
  60 static void h1910_hwcontrol(struct mtd_info *mtd, int cmd)
  61 {
  62         struct nand_chip* this = (struct nand_chip *) (mtd->priv);
  63
  64         switch(cmd) {
  65
  66         case NAND_CTL_SETCLE:
  67                 this->IO_ADDR_R |= (1 << 2);
  68                 this->IO_ADDR_W |= (1 << 2);
  69                 break;
  70         case NAND_CTL_CLRCLE:
  71                 this->IO_ADDR_R &= ~(1 << 2);
  72                 this->IO_ADDR_W &= ~(1 << 2);
  73                 break;
  74
  75         case NAND_CTL_SETALE:
  76                 this->IO_ADDR_R |= (1 << 3);
  77                 this->IO_ADDR_W |= (1 << 3);
  78                 break;
  79         case NAND_CTL_CLRALE:
  80                 this->IO_ADDR_R &= ~(1 << 3);
  81                 this->IO_ADDR_W &= ~(1 << 3);
  82                 break;
  83
  84         case NAND_CTL_SETNCE:
  85                 break;
  86         case NAND_CTL_CLRNCE:
  87                 break;
  88         }
  89 }
  90
  91 /*
  92  *      read device ready pin
  93  */
  94 #if 0
  95 static int h1910_device_ready(struct mtd_info *mtd)
  96 {
  97         return (GPLR(55) & GPIO_bit(55));
  98 }
  99 #endif
 100
 101 /*
 102  * Main initialization routine
 103  */
 104 static int __init h1910_init (void)
 105 {
 106         struct nand_chip *this;
 107         const char *part_type = 0;
 108         int mtd_parts_nb = 0;
 109         struct mtd_partition *mtd_parts = 0;
 110         void __iomem *nandaddr;
 111
 112         if (!machine_is_h1900())
 113                 return -ENODEV;
 114
 115         nandaddr = __ioremap(0x08000000, 0x1000, 0, 1);
 116         if (!nandaddr) {
 117                 printk("Failed to ioremap nand flash.\n");
 118                 return -ENOMEM;
 119         }
 120
 121         /* Allocate memory for MTD device structure and private data */
 122         h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) +
 123                              sizeof(struct nand_chip),
 124                              GFP_KERNEL);
 125         if (!h1910_nand_mtd) {
 126                 printk("Unable to allocate h1910 NAND MTD device structure.\n");
 127                 iounmap ((void *) nandaddr);
 128                 return -ENOMEM;
 129         }
 130
 131         /* Get pointer to private data */
 132         this = (struct nand_chip *) (&h1910_nand_mtd[1]);
 133
 134         /* Initialize structures */
 135         memset((char *) h1910_nand_mtd, 0, sizeof(struct mtd_info));
 136         memset((char *) this, 0, sizeof(struct nand_chip));
 137
 138         /* Link the private data with the MTD structure */
 139         h1910_nand_mtd->priv = this;
 140
 141         /*
 142          * Enable VPEN
 143          */
 144         GPSR(37) = GPIO_bit(37);
 145
 146         /* insert callbacks */
 147         this->IO_ADDR_R = nandaddr;
 148         this->IO_ADDR_W = nandaddr;
 149         this->hwcontrol = h1910_hwcontrol;
 150         this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */
 151         /* 15 us command delay time */
 152         this->chip_delay = 50;
 153         this->eccmode = NAND_ECC_SOFT;
 154         this->options = NAND_NO_AUTOINCR;
 155
 156         /* Scan to find existence of the device */
 157         if (nand_scan (h1910_nand_mtd, 1)) {
 158                 printk(KERN_NOTICE "No NAND device - returning -ENXIO\n");
 159                 kfree (h1910_nand_mtd);
 160                 iounmap ((void *) nandaddr);
 161                 return -ENXIO;
 162         }
 163
 164 #ifdef CONFIG_MTD_CMDLINE_PARTS
 165         mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts,
 166                                                 "h1910-nand");
 167         if (mtd_parts_nb > 0)
 168           part_type = "command line";
 169         else
 170           mtd_parts_nb = 0;
 171 #endif
 172         if (mtd_parts_nb == 0)
 173         {
 174                 mtd_parts = partition_info;
 175                 mtd_parts_nb = NUM_PARTITIONS;
 176                 part_type = "static";
 177         }
 178
 179         /* Register the partitions */
 180         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 181         add_mtd_partitions(h1910_nand_mtd, mtd_parts, mtd_parts_nb);
 182
 183         /* Return happy */
 184         return 0;
 185 }
 186 module_init(h1910_init);
 187
 188 /*
 189  * Clean up routine
 190  */
 191 static void __exit h1910_cleanup (void)
 192 {
 193         struct nand_chip *this = (struct nand_chip *) &h1910_nand_mtd[1];
 194
 195         /* Release resources, unregister device */
 196         nand_release (h1910_nand_mtd);
 197
 198         /* Release io resource */
 199         iounmap ((void *) this->IO_ADDR_W);
 200
 201         /* Free the MTD device structure */
 202         kfree (h1910_nand_mtd);
 203 }
 204 module_exit(h1910_cleanup);
 205
 206 MODULE_LICENSE("GPL");
 207 MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");
 208 MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");