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>      /* for CLPS7111_VIRT_BASE */
  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         const char *part_type = 0;
  85         int mtd_parts_nb = 0;
  86         struct mtd_partition *mtd_parts = 0;
  87         void __iomem *nandaddr;
  88
  89         if (!machine_is_h1900())
  90                 return -ENODEV;
  91
  92         nandaddr = ioremap(0x08000000, 0x1000);
  93         if (!nandaddr) {
  94                 printk("Failed to ioremap nand flash.\n");
  95                 return -ENOMEM;
  96         }
  97
  98         /* Allocate memory for MTD device structure and private data */
  99         h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 100         if (!h1910_nand_mtd) {
 101                 printk("Unable to allocate h1910 NAND MTD device structure.\n");
 102                 iounmap((void *)nandaddr);
 103                 return -ENOMEM;
 104         }
 105
 106         /* Get pointer to private data */
 107         this = (struct nand_chip *)(&h1910_nand_mtd[1]);
 108
 109         /* Initialize structures */
 110         memset(h1910_nand_mtd, 0, sizeof(struct mtd_info));
 111         memset(this, 0, sizeof(struct nand_chip));
 112
 113         /* Link the private data with the MTD structure */
 114         h1910_nand_mtd->priv = this;
 115         h1910_nand_mtd->owner = THIS_MODULE;
 116
 117         /*
 118          * Enable VPEN
 119          */
 120         GPSR(37) = GPIO_bit(37);
 121
 122         /* insert callbacks */
 123         this->IO_ADDR_R = nandaddr;
 124         this->IO_ADDR_W = nandaddr;
 125         this->cmd_ctrl = h1910_hwcontrol;
 126         this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */
 127         /* 15 us command delay time */
 128         this->chip_delay = 50;
 129         this->ecc.mode = NAND_ECC_SOFT;
 130         this->options = NAND_NO_AUTOINCR;
 131
 132         /* Scan to find existence of the device */
 133         if (nand_scan(h1910_nand_mtd, 1)) {
 134                 printk(KERN_NOTICE "No NAND device - returning -ENXIO\n");
 135                 kfree(h1910_nand_mtd);
 136                 iounmap((void *)nandaddr);
 137                 return -ENXIO;
 138         }
 139 #ifdef CONFIG_MTD_CMDLINE_PARTS
 140         mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts, "h1910-nand");
 141         if (mtd_parts_nb > 0)
 142                 part_type = "command line";
 143         else
 144                 mtd_parts_nb = 0;
 145 #endif
 146         if (mtd_parts_nb == 0) {
 147                 mtd_parts = partition_info;
 148                 mtd_parts_nb = NUM_PARTITIONS;
 149                 part_type = "static";
 150         }
 151
 152         /* Register the partitions */
 153         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 154         mtd_device_register(h1910_nand_mtd, mtd_parts, mtd_parts_nb);
 155
 156         /* Return happy */
 157         return 0;
 158 }
 159
 160 module_init(h1910_init);
 161
 162 /*
 163  * Clean up routine
 164  */
 165 static void __exit h1910_cleanup(void)
 166 {
 167         struct nand_chip *this = (struct nand_chip *)&h1910_nand_mtd[1];
 168
 169         /* Release resources, unregister device */
 170         nand_release(h1910_nand_mtd);
 171
 172         /* Release io resource */
 173         iounmap((void *)this->IO_ADDR_W);
 174
 175         /* Free the MTD device structure */
 176         kfree(h1910_nand_mtd);
 177 }
 178
 179 module_exit(h1910_cleanup);
 180
 181 MODULE_LICENSE("GPL");
 182 MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");
 183 MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");