target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c

   1 /*==============================================================================*/
   2 /* rbmipsnand.c                                                                 */
   3 /* This module is derived from the 2.4 driver shipped by Microtik for their     */
   4 /* Routerboard 1xx and 5xx series boards.  It provides support for the built in */
   5 /* NAND flash on the Routerboard 1xx series boards for Linux 2.6.19+.           */
   6 /* Licence: Original Microtik code seems not to have a licence.                 */
   7 /*          Rewritten code all GPL V2.                                          */
   8 /* Copyright(C) 2007 david.goodenough@linkchoose.co.uk (for rewriten code)      */
   9 /*==============================================================================*/
  10
  11 #include <linux/io.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/mtd/nand.h>
  15 #include <linux/mtd/mtd.h>
  16 #include <linux/mtd/partitions.h>
  17 #include <linux/delay.h>
  18
  19 #include <asm/io.h>
  20 #include <asm/irq.h>
  21 #include <asm/bootinfo.h>
  22 #include <asm/mach-adm5120/adm5120_info.h>
  23 #include <asm/mach-adm5120/adm5120_defs.h>
  24
  25 #define SMEM1(x) (*((volatile unsigned char *) (KSEG1ADDR(ADM5120_SRAM1_BASE) + x)))
  26
  27 #define NAND_RW_REG     0x0     //data register
  28 #define NAND_SET_CEn    0x1     //CE# low
  29 #define NAND_CLR_CEn    0x2     //CE# high
  30 #define NAND_CLR_CLE    0x3     //CLE low
  31 #define NAND_SET_CLE    0x4     //CLE high
  32 #define NAND_CLR_ALE    0x5     //ALE low
  33 #define NAND_SET_ALE    0x6     //ALE high
  34 #define NAND_SET_SPn    0x7     //SP# low (use spare area)
  35 #define NAND_CLR_SPn    0x8     //SP# high (do not use spare area)
  36 #define NAND_SET_WPn    0x9     //WP# low
  37 #define NAND_CLR_WPn    0xA     //WP# high
  38 #define NAND_STS_REG    0xB     //Status register
  39
  40 #define MEM32(x) *((volatile unsigned *) (x))
  41
  42 static struct mtd_partition partition_info[] = {
  43     {
  44         name: "RouterBoard NAND Boot",
  45         offset: 0,
  46         size: 4 * 1024 * 1024
  47     },
  48     {
  49         name: "rootfs",
  50         offset: MTDPART_OFS_NXTBLK,
  51         size: MTDPART_SIZ_FULL
  52     }
  53 };
  54
  55 static struct nand_ecclayout rb_ecclayout = {
  56         .eccbytes = 6,
  57         .eccpos = { 8, 9, 10, 13, 14, 15 },
  58         .oobavail = 9,
  59         .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1} }
  60 };
  61
  62 struct adm5120_nand_info {
  63         struct nand_chip chip;
  64         struct mtd_info mtd;
  65         void __iomem *io_base;
  66 #ifdef CONFIG_MTD_PARTITIONS
  67         int     nr_parts;
  68         struct mtd_partition *parts;
  69 #endif
  70         unsigned int    init_ok;
  71 };
  72
  73 static int rb100_dev_ready(struct mtd_info *mtd)
  74 {
  75         return SMEM1(NAND_STS_REG) & 0x80;
  76 }
  77
  78 static void rbmips_hwcontrol100(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  79 {
  80         struct nand_chip *chip = mtd->priv;
  81         if (ctrl & NAND_CTRL_CHANGE)
  82         {
  83                 SMEM1((( ctrl & NAND_CLE) ? NAND_SET_CLE : NAND_CLR_CLE)) = 0x01;
  84                 SMEM1((( ctrl & NAND_ALE) ? NAND_SET_ALE : NAND_CLR_ALE)) = 0x01;
  85                 SMEM1((( ctrl & NAND_NCE) ? NAND_SET_CEn : NAND_CLR_CEn)) = 0x01;
  86         }
  87         if (cmd != NAND_CMD_NONE)
  88                 writeb( cmd, chip->IO_ADDR_W);
  89 }
  90
  91 /*========================================================================*/
  92 /* We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader */
  93 /* will not be able to find the kernel that we load.  So set the oobinfo  */
  94 /* when creating the partitions.                                          */
  95 /*========================================================================*/
  96
  97
  98 unsigned get_rbnand_block_size(struct adm5120_nand_info *data)
  99 {
 100         return data->init_ok ? data->mtd.writesize : 0;
 101 }
 102
 103 EXPORT_SYMBOL(get_rbnand_block_size);
 104
 105 static int rbmips_probe(struct platform_device *pdev)
 106 {
 107         struct adm5120_nand_info *data;
 108         int res = 0;
 109
 110         /* Allocate memory for the nand_chip structure */
 111         data = kzalloc(sizeof(*data), GFP_KERNEL);
 112         if (!data) {
 113                 dev_err(&pdev->dev, "Failed to allocate device structure\n");
 114                 return -ENOMEM;
 115
 116         }
 117
 118         data->io_base = ioremap(pdev->resource[0].start, pdev->resource[0].end - pdev->resource[0].start + 1);
 119
 120         if (data->io_base == NULL) {
 121                 dev_err(&pdev->dev, "ioremap failed\n");
 122                 kfree(data);
 123                 return -EIO;
 124         }
 125
 126         MEM32(0xB2000064) = 0x100;
 127         MEM32(0xB2000008) = 0x1;
 128         SMEM1(NAND_SET_SPn) = 0x01;
 129         SMEM1(NAND_CLR_WPn) = 0x01;
 130
 131         data->chip.priv = &data;
 132         data->mtd.priv = &data->chip;
 133         data->mtd.owner = THIS_MODULE;
 134
 135         data->init_ok = 0;
 136         data->chip.IO_ADDR_R = (unsigned char *)KSEG1ADDR(ADM5120_SRAM1_BASE);
 137         data->chip.IO_ADDR_W = data->chip.IO_ADDR_R;
 138         data->chip.cmd_ctrl = rbmips_hwcontrol100;
 139         data->chip.dev_ready = rb100_dev_ready;
 140         data->chip.ecc.mode = NAND_ECC_SOFT;
 141         data->chip.ecc.layout = &rb_ecclayout;
 142         data->chip.chip_delay = 25;
 143         data->chip.options |= NAND_NO_AUTOINCR;
 144
 145         platform_set_drvdata(pdev, data);
 146
 147         /* Why do we need to scan 4 times ? */
 148         if (nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1)  && nand_scan(&data->mtd, 1)) {
 149                 printk(KERN_INFO "RB1xxx nand device not found\n");
 150                 res = -ENXIO;
 151                 goto out;
 152         }
 153
 154         add_mtd_partitions(&data->mtd, partition_info, 2);
 155         data->init_ok = 1;
 156
 157         res = add_mtd_device(&data->mtd);
 158         if (!res)
 159                 return res;
 160
 161         nand_release(&data->mtd);
 162 out:
 163         platform_set_drvdata(pdev, NULL);
 164         iounmap(data->io_base);
 165         kfree(data);
 166         return res;
 167 }
 168
 169 static int __devexit rbmips_remove(struct platform_device *pdev)
 170 {
 171         struct adm5120_nand_info *data = platform_get_drvdata(pdev);
 172
 173         nand_release(&data->mtd);
 174         iounmap(data->io_base);
 175         kfree(data);
 176
 177         return 0;
 178 }
 179
 180 static struct platform_driver adm5120_nand_driver = {
 181         .probe          = rbmips_probe,
 182         .remove         = rbmips_remove,
 183         .driver         = {
 184                 .name   = "adm5120-nand",
 185                 .owner  = THIS_MODULE,
 186         },
 187 };
 188
 189 static int __init adm5120_nand_init(void)
 190 {
 191         int err;
 192         err = platform_driver_register(&adm5120_nand_driver);
 193         return err;
 194 }
 195
 196 static void __exit adm5120_nand_exit(void)
 197 {
 198         platform_driver_unregister(&adm5120_nand_driver);
 199 }
 200
 201 module_init(adm5120_nand_init);
 202 module_exit(adm5120_nand_exit);
 203
 204 MODULE_LICENSE("GPL");
 205 MODULE_AUTHOR("David Goodenough, Florian Fainelli");
 206 MODULE_DESCRIPTION("RouterBOARD 100 NAND driver");
 207