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