kernel/2.6.29.6-aldebaran-rt/drivers/mtd/nand/sharpsl.c

   1 /*
   2  * drivers/mtd/nand/sharpsl.c
   3  *
   4  *  Copyright (C) 2004 Richard Purdie
   5  *  Copyright (C) 2008 Dmitry Baryshkov
   6  *
   7  *  Based on Sharp's NAND driver sharp_sl.c
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  */
  14
  15 #include <linux/genhd.h>
  16 #include <linux/slab.h>
  17 #include <linux/module.h>
  18 #include <linux/delay.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/nand.h>
  21 #include <linux/mtd/nand_ecc.h>
  22 #include <linux/mtd/partitions.h>
  23 #include <linux/mtd/sharpsl.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/platform_device.h>
  26
  27 #include <asm/io.h>
  28 #include <mach/hardware.h>
  29 #include <asm/mach-types.h>
  30
  31 struct sharpsl_nand {
  32         struct mtd_info         mtd;
  33         struct nand_chip        chip;
  34
  35         void __iomem            *io;
  36 };
  37
  38 #define mtd_to_sharpsl(_mtd)    container_of(_mtd, struct sharpsl_nand, mtd)
  39
  40 /* register offset */
  41 #define ECCLPLB         0x00    /* line parity 7 - 0 bit */
  42 #define ECCLPUB         0x04    /* line parity 15 - 8 bit */
  43 #define ECCCP           0x08    /* column parity 5 - 0 bit */
  44 #define ECCCNTR         0x0C    /* ECC byte counter */
  45 #define ECCCLRR         0x10    /* cleare ECC */
  46 #define FLASHIO         0x14    /* Flash I/O */
  47 #define FLASHCTL        0x18    /* Flash Control */
  48
  49 /* Flash control bit */
  50 #define FLRYBY          (1 << 5)
  51 #define FLCE1           (1 << 4)
  52 #define FLWP            (1 << 3)
  53 #define FLALE           (1 << 2)
  54 #define FLCLE           (1 << 1)
  55 #define FLCE0           (1 << 0)
  56
  57 /*
  58  *      hardware specific access to control-lines
  59  *      ctrl:
  60  *      NAND_CNE: bit 0 -> ! bit 0 & 4
  61  *      NAND_CLE: bit 1 -> bit 1
  62  *      NAND_ALE: bit 2 -> bit 2
  63  *
  64  */
  65 static void sharpsl_nand_hwcontrol(struct mtd_info *mtd, int cmd,
  66                                    unsigned int ctrl)
  67 {
  68         struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
  69         struct nand_chip *chip = mtd->priv;
  70
  71         if (ctrl & NAND_CTRL_CHANGE) {
  72                 unsigned char bits = ctrl & 0x07;
  73
  74                 bits |= (ctrl & 0x01) << 4;
  75
  76                 bits ^= 0x11;
  77
  78                 writeb((readb(sharpsl->io + FLASHCTL) & ~0x17) | bits, sharpsl->io + FLASHCTL);
  79         }
  80
  81         if (cmd != NAND_CMD_NONE)
  82                 writeb(cmd, chip->IO_ADDR_W);
  83 }
  84
  85 static int sharpsl_nand_dev_ready(struct mtd_info *mtd)
  86 {
  87         struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
  88         return !((readb(sharpsl->io + FLASHCTL) & FLRYBY) == 0);
  89 }
  90
  91 static void sharpsl_nand_enable_hwecc(struct mtd_info *mtd, int mode)
  92 {
  93         struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
  94         writeb(0, sharpsl->io + ECCCLRR);
  95 }
  96
  97 static int sharpsl_nand_calculate_ecc(struct mtd_info *mtd, const u_char * dat, u_char * ecc_code)
  98 {
  99         struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
 100         ecc_code[0] = ~readb(sharpsl->io + ECCLPUB);
 101         ecc_code[1] = ~readb(sharpsl->io + ECCLPLB);
 102         ecc_code[2] = (~readb(sharpsl->io + ECCCP) << 2) | 0x03;
 103         return readb(sharpsl->io + ECCCNTR) != 0;
 104 }
 105
 106 #ifdef CONFIG_MTD_PARTITIONS
 107 static const char *part_probes[] = { "cmdlinepart", NULL };
 108 #endif
 109
 110 /*
 111  * Main initialization routine
 112  */
 113 static int __devinit sharpsl_nand_probe(struct platform_device *pdev)
 114 {
 115         struct nand_chip *this;
 116 #ifdef CONFIG_MTD_PARTITIONS
 117         struct mtd_partition *sharpsl_partition_info;
 118         int nr_partitions;
 119 #endif
 120         struct resource *r;
 121         int err = 0;
 122         struct sharpsl_nand *sharpsl;
 123         struct sharpsl_nand_platform_data *data = pdev->dev.platform_data;
 124
 125         if (!data) {
 126                 dev_err(&pdev->dev, "no platform data!\n");
 127                 return -EINVAL;
 128         }
 129
 130         /* Allocate memory for MTD device structure and private data */
 131         sharpsl = kzalloc(sizeof(struct sharpsl_nand), GFP_KERNEL);
 132         if (!sharpsl) {
 133                 printk("Unable to allocate SharpSL NAND MTD device structure.\n");
 134                 return -ENOMEM;
 135         }
 136
 137         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 138         if (!r) {
 139                 dev_err(&pdev->dev, "no io memory resource defined!\n");
 140                 err = -ENODEV;
 141                 goto err_get_res;
 142         }
 143
 144         /* map physical address */
 145         sharpsl->io = ioremap(r->start, resource_size(r));
 146         if (!sharpsl->io) {
 147                 printk("ioremap to access Sharp SL NAND chip failed\n");
 148                 err = -EIO;
 149                 goto err_ioremap;
 150         }
 151
 152         /* Get pointer to private data */
 153         this = (struct nand_chip *)(&sharpsl->chip);
 154
 155         /* Link the private data with the MTD structure */
 156         sharpsl->mtd.priv = this;
 157         sharpsl->mtd.owner = THIS_MODULE;
 158
 159         platform_set_drvdata(pdev, sharpsl);
 160
 161         /*
 162          * PXA initialize
 163          */
 164         writeb(readb(sharpsl->io + FLASHCTL) | FLWP, sharpsl->io + FLASHCTL);
 165
 166         /* Set address of NAND IO lines */
 167         this->IO_ADDR_R = sharpsl->io + FLASHIO;
 168         this->IO_ADDR_W = sharpsl->io + FLASHIO;
 169         /* Set address of hardware control function */
 170         this->cmd_ctrl = sharpsl_nand_hwcontrol;
 171         this->dev_ready = sharpsl_nand_dev_ready;
 172         /* 15 us command delay time */
 173         this->chip_delay = 15;
 174         /* set eccmode using hardware ECC */
 175         this->ecc.mode = NAND_ECC_HW;
 176         this->ecc.size = 256;
 177         this->ecc.bytes = 3;
 178         this->badblock_pattern = data->badblock_pattern;
 179         this->ecc.layout = data->ecc_layout;
 180         this->ecc.hwctl = sharpsl_nand_enable_hwecc;
 181         this->ecc.calculate = sharpsl_nand_calculate_ecc;
 182         this->ecc.correct = nand_correct_data;
 183
 184         /* Scan to find existence of the device */
 185         err = nand_scan(&sharpsl->mtd, 1);
 186         if (err)
 187                 goto err_scan;
 188
 189         /* Register the partitions */
 190         sharpsl->mtd.name = "sharpsl-nand";
 191 #ifdef CONFIG_MTD_PARTITIONS
 192         nr_partitions = parse_mtd_partitions(&sharpsl->mtd, part_probes, &sharpsl_partition_info, 0);
 193         if (nr_partitions <= 0) {
 194                 nr_partitions = data->nr_partitions;
 195                 sharpsl_partition_info = data->partitions;
 196         }
 197
 198         if (nr_partitions > 0)
 199                 err = add_mtd_partitions(&sharpsl->mtd, sharpsl_partition_info, nr_partitions);
 200         else
 201 #endif
 202         err = add_mtd_device(&sharpsl->mtd);
 203         if (err)
 204                 goto err_add;
 205
 206         /* Return happy */
 207         return 0;
 208
 209 err_add:
 210         nand_release(&sharpsl->mtd);
 211
 212 err_scan:
 213         platform_set_drvdata(pdev, NULL);
 214         iounmap(sharpsl->io);
 215 err_ioremap:
 216 err_get_res:
 217         kfree(sharpsl);
 218         return err;
 219 }
 220
 221 /*
 222  * Clean up routine
 223  */
 224 static int __devexit sharpsl_nand_remove(struct platform_device *pdev)
 225 {
 226         struct sharpsl_nand *sharpsl = platform_get_drvdata(pdev);
 227
 228         /* Release resources, unregister device */
 229         nand_release(&sharpsl->mtd);
 230
 231         platform_set_drvdata(pdev, NULL);
 232
 233         iounmap(sharpsl->io);
 234
 235         /* Free the MTD device structure */
 236         kfree(sharpsl);
 237
 238         return 0;
 239 }
 240
 241 static struct platform_driver sharpsl_nand_driver = {
 242         .driver = {
 243                 .name   = "sharpsl-nand",
 244                 .owner  = THIS_MODULE,
 245         },
 246         .probe          = sharpsl_nand_probe,
 247         .remove         = __devexit_p(sharpsl_nand_remove),
 248 };
 249
 250 static int __init sharpsl_nand_init(void)
 251 {
 252         return platform_driver_register(&sharpsl_nand_driver);
 253 }
 254 module_init(sharpsl_nand_init);
 255
 256 static void __exit sharpsl_nand_exit(void)
 257 {
 258         platform_driver_unregister(&sharpsl_nand_driver);
 259 }
 260 module_exit(sharpsl_nand_exit);
 261
 262 MODULE_LICENSE("GPL");
 263 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 264 MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");