drivers/mtd/nand/toto.c

   1 /*
   2  *  drivers/mtd/nand/toto.c
   3  *
   4  *  Copyright (c) 2003 Texas Instruments
   5  *
   6  *  Derived from drivers/mtd/autcpu12.c
   7  *
   8  *  Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.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  *   TI fido board. It supports 32MiB and 64MiB cards
  17  *
  18  * $Id: toto.c,v 1.5 2005/11/07 11:14:31 gleixner Exp $
  19  */
  20
  21 #include <linux/slab.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/delay.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>
  30 #include <asm/sizes.h>
  31 #include <asm/arch/toto.h>
  32 #include <asm/arch-omap1510/hardware.h>
  33 #include <asm/arch/gpio.h>
  34
  35 /*
  36  * MTD structure for TOTO board
  37  */
  38 static struct mtd_info *toto_mtd = NULL;
  39
  40 static unsigned long toto_io_base = OMAP_FLASH_1_BASE;
  41
  42 #define CONFIG_NAND_WORKAROUND 1
  43
  44 #define NAND_NCE 0x4000
  45 #define NAND_CLE 0x1000
  46 #define NAND_ALE 0x0002
  47 #define NAND_MASK (NAND_CLE | NAND_ALE | NAND_NCE)
  48
  49 #define T_NAND_CTL_CLRALE(iob)  gpiosetout(NAND_ALE, 0)
  50 #define T_NAND_CTL_SETALE(iob)  gpiosetout(NAND_ALE, NAND_ALE)
  51 #ifdef CONFIG_NAND_WORKAROUND     /* "some" dev boards busted, blue wired to rts2 :( */
  52 #define T_NAND_CTL_CLRCLE(iob)  gpiosetout(NAND_CLE, 0); rts2setout(2, 2)
  53 #define T_NAND_CTL_SETCLE(iob)  gpiosetout(NAND_CLE, NAND_CLE); rts2setout(2, 0)
  54 #else
  55 #define T_NAND_CTL_CLRCLE(iob)  gpiosetout(NAND_CLE, 0)
  56 #define T_NAND_CTL_SETCLE(iob)  gpiosetout(NAND_CLE, NAND_CLE)
  57 #endif
  58 #define T_NAND_CTL_SETNCE(iob)  gpiosetout(NAND_NCE, 0)
  59 #define T_NAND_CTL_CLRNCE(iob)  gpiosetout(NAND_NCE, NAND_NCE)
  60
  61 /*
  62  * Define partitions for flash devices
  63  */
  64
  65 static struct mtd_partition partition_info64M[] = {
  66         { .name =       "toto kernel partition 1",
  67           .offset =     0,
  68           .size =       2 * SZ_1M },
  69         { .name =       "toto file sys partition 2",
  70           .offset =     2 * SZ_1M,
  71           .size =       14 * SZ_1M },
  72         { .name =       "toto user partition 3",
  73           .offset =     16 * SZ_1M,
  74           .size =       16 * SZ_1M },
  75         { .name =       "toto devboard extra partition 4",
  76           .offset =     32 * SZ_1M,
  77           .size =       32 * SZ_1M },
  78 };
  79
  80 static struct mtd_partition partition_info32M[] = {
  81         { .name =       "toto kernel partition 1",
  82           .offset =     0,
  83           .size =       2 * SZ_1M },
  84         { .name =       "toto file sys partition 2",
  85           .offset =     2 * SZ_1M,
  86           .size =       14 * SZ_1M },
  87         { .name =       "toto user partition 3",
  88           .offset =     16 * SZ_1M,
  89           .size =       16 * SZ_1M },
  90 };
  91
  92 #define NUM_PARTITIONS32M 3
  93 #define NUM_PARTITIONS64M 4
  94 /*
  95  *      hardware specific access to control-lines
  96 */
  97
  98 static void toto_hwcontrol(struct mtd_info *mtd, int cmd)
  99 {
 100
 101         udelay(1); /* hopefully enough time for tc make proceding write to clear */
 102         switch(cmd){
 103
 104                 case NAND_CTL_SETCLE: T_NAND_CTL_SETCLE(cmd); break;
 105                 case NAND_CTL_CLRCLE: T_NAND_CTL_CLRCLE(cmd); break;
 106
 107                 case NAND_CTL_SETALE: T_NAND_CTL_SETALE(cmd); break;
 108                 case NAND_CTL_CLRALE: T_NAND_CTL_CLRALE(cmd); break;
 109
 110                 case NAND_CTL_SETNCE: T_NAND_CTL_SETNCE(cmd); break;
 111                 case NAND_CTL_CLRNCE: T_NAND_CTL_CLRNCE(cmd); break;
 112         }
 113         udelay(1); /* allow time to ensure gpio state to over take memory write */
 114 }
 115
 116 /*
 117  * Main initialization routine
 118  */
 119 int __init toto_init (void)
 120 {
 121         struct nand_chip *this;
 122         int err = 0;
 123
 124         /* Allocate memory for MTD device structure and private data */
 125         toto_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
 126                                 GFP_KERNEL);
 127         if (!toto_mtd) {
 128                 printk (KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n");
 129                 err = -ENOMEM;
 130                 goto out;
 131         }
 132
 133         /* Get pointer to private data */
 134         this = (struct nand_chip *) (&toto_mtd[1]);
 135
 136         /* Initialize structures */
 137         memset((char *) toto_mtd, 0, sizeof(struct mtd_info));
 138         memset((char *) this, 0, sizeof(struct nand_chip));
 139
 140         /* Link the private data with the MTD structure */
 141         toto_mtd->priv = this;
 142
 143         /* Set address of NAND IO lines */
 144         this->IO_ADDR_R = toto_io_base;
 145         this->IO_ADDR_W = toto_io_base;
 146         this->hwcontrol = toto_hwcontrol;
 147         this->dev_ready = NULL;
 148         /* 25 us command delay time */
 149         this->chip_delay = 30;
 150         this->eccmode = NAND_ECC_SOFT;
 151
 152         /* Scan to find existance of the device */
 153         if (nand_scan (toto_mtd, 1)) {
 154                 err = -ENXIO;
 155                 goto out_mtd;
 156         }
 157
 158         /* Register the partitions */
 159         switch(toto_mtd->size){
 160                 case SZ_64M: add_mtd_partitions(toto_mtd, partition_info64M, NUM_PARTITIONS64M); break;
 161                 case SZ_32M: add_mtd_partitions(toto_mtd, partition_info32M, NUM_PARTITIONS32M); break;
 162                 default: {
 163                         printk (KERN_WARNING "Unsupported Nand device\n");
 164                         err = -ENXIO;
 165                         goto out_buf;
 166                 }
 167         }
 168
 169         gpioreserve(NAND_MASK);  /* claim our gpios */
 170         archflashwp(0,0);        /* open up flash for writing */
 171
 172         goto out;
 173
 174 out_buf:
 175         kfree (this->data_buf);
 176 out_mtd:
 177         kfree (toto_mtd);
 178 out:
 179         return err;
 180 }
 181
 182 module_init(toto_init);
 183
 184 /*
 185  * Clean up routine
 186  */
 187 static void __exit toto_cleanup (void)
 188 {
 189         /* Release resources, unregister device */
 190         nand_release (toto_mtd);
 191
 192         /* Free the MTD device structure */
 193         kfree (toto_mtd);
 194
 195         /* stop flash writes */
 196          archflashwp(0,1);
 197
 198         /* release gpios to system */
 199          gpiorelease(NAND_MASK);
 200 }
 201 module_exit(toto_cleanup);
 202
 203 MODULE_LICENSE("GPL");
 204 MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");
 205 MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");