target/linux/rb532-2.6/files/drivers/mtd/nand/rbmipsnand.c

   1 #include <linux/io.h>
   2 #include <linux/module.h>
   3 #include <linux/platform_device.h>
   4 #include <linux/mtd/nand.h>
   5 #include <linux/mtd/mtd.h>
   6 #include <linux/mtd/partitions.h>
   7 #include <linux/delay.h>
   8
   9 #include <asm/io.h>
  10 #include <asm/irq.h>
  11 #include <asm/bootinfo.h>
  12
  13 #define IDT434_REG_BASE ((volatile void *) KSEG1ADDR(0x18000000))
  14
  15 #define GPIOF 0x050000
  16 #define GPIOC 0x050004
  17 #define GPIOD 0x050008
  18
  19 #define GPIO_RDY (1 << 0x08)
  20 #define GPIO_WPX (1 << 0x09)
  21 #define GPIO_ALE (1 << 0x0a)
  22 #define GPIO_CLE (1 << 0x0b)
  23
  24 #define DEV2BASE 0x010020
  25
  26 #define LO_WPX   (1 << 0)
  27 #define LO_ALE   (1 << 1)
  28 #define LO_CLE   (1 << 2)
  29 #define LO_CEX   (1 << 3)
  30 #define LO_FOFF  (1 << 5)
  31 #define LO_SPICS (1 << 6)
  32 #define LO_ULED  (1 << 7)
  33
  34 #define MEM32(x) *((volatile unsigned *) (x))
  35
  36 struct rb500_nand_info {
  37         struct nand_chip chip;
  38         struct mtd_info mtd;
  39         void __iomem *io_base;
  40 #ifdef CONFIG_MTD_PARTITIONS
  41         int     nr_parts;
  42         struct mtd_partition *parts;
  43 #endif
  44         int     init_ok;
  45         int     flags1;
  46         int     flags2;
  47 };
  48
  49 static struct mtd_partition partition_info[] = {
  50         {
  51               name:"RouterBoard NAND Boot",
  52               offset:0,
  53       size:4 * 1024 * 1024},
  54         {
  55               name:"rootfs",
  56               offset:MTDPART_OFS_NXTBLK,
  57         size:MTDPART_SIZ_FULL}
  58 };
  59
  60 extern void changeLatchU5(unsigned char orMask, unsigned char nandMask);
  61
  62 static int rb500_dev_ready(struct mtd_info *mtd)
  63 {
  64         return MEM32(IDT434_REG_BASE + GPIOD) & GPIO_RDY;
  65 }
  66
  67 /*
  68  * hardware specific access to control-lines
  69  *
  70  * ctrl:
  71  *     NAND_CLE: bit 2 -> bit 3
  72  *     NAND_ALE: bit 3 -> bit 2
  73  */
  74 static void rbmips_hwcontrol500(struct mtd_info *mtd, int cmd,
  75                                 unsigned int ctrl)
  76 {
  77         struct nand_chip *chip = mtd->priv;
  78         unsigned char orbits, nandbits;
  79
  80         if (ctrl & NAND_CTRL_CHANGE) {
  81
  82                 orbits = (ctrl & NAND_CLE) << 1;
  83                 orbits |= (ctrl & NAND_ALE) >> 1;
  84
  85                 nandbits = (~ctrl & NAND_CLE) << 1;
  86                 nandbits |= (~ctrl & NAND_ALE) >> 1;
  87
  88                 changeLatchU5(orbits, nandbits);
  89         }
  90         if (cmd != NAND_CMD_NONE)
  91                 writeb(cmd, chip->IO_ADDR_W);
  92
  93 }
  94
  95 unsigned get_rbnand_block_size(struct rb500_nand_info *data)
  96 {
  97         if (data->init_ok)
  98                 return data->mtd.writesize;
  99         else
 100                 return 0;
 101 }
 102
 103 EXPORT_SYMBOL(get_rbnand_block_size);
 104
 105 static int rbmips_probe(struct platform_device *pdev)
 106 {
 107         struct rb500_nand_info *data;
 108         int res = 0;
 109         int *b;
 110
 111         /* Allocate memory for the structure */
 112         data = kzalloc(sizeof(*data), GFP_KERNEL);
 113         if (!data) {
 114                 dev_err(&pdev->dev, "Failed to allocate device structure\n");
 115                 return -ENOMEM;
 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         /* FIXME : this seems to work only for newer RB500, check the version to set the right flags accordingly */
 127         data->flags1 = LO_FOFF | LO_CEX;
 128         data->flags2 = LO_ULED | LO_ALE | LO_CLE | LO_WPX;
 129
 130         changeLatchU5(data->flags1, data->flags2);
 131
 132         data->chip.cmd_ctrl = rbmips_hwcontrol500;
 133
 134         data->chip.dev_ready = rb500_dev_ready;
 135         data->chip.IO_ADDR_W = (unsigned char *)KSEG1ADDR(MEM32(IDT434_REG_BASE + DEV2BASE));
 136         data->chip.IO_ADDR_R = data->chip.IO_ADDR_W;
 137
 138         data->chip.ecc.mode = NAND_ECC_SOFT;
 139         data->chip.chip_delay = 25;
 140         data->chip.options |= NAND_NO_AUTOINCR;
 141
 142         data->chip.priv = &data;
 143         data->mtd.priv = &data->chip;
 144         data->mtd.owner = THIS_MODULE;
 145
 146         b = (int *) KSEG1ADDR(0x18010020);
 147         printk("dev2base 0x%08x mask 0x%08x c 0x%08x tc 0x%08x\n", b[0],
 148                b[1], b[2], b[3]);
 149
 150         platform_set_drvdata(pdev, data);
 151
 152         /* Why do we need to scan 4 times ? */
 153         if (nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1)  && nand_scan(&data->mtd, 1)) {
 154                 printk(KERN_INFO "RB500 nand device not found\n");
 155                 res = -ENXIO;
 156                 goto out;
 157         }
 158
 159         printk(KERN_INFO "RB500 NAND\n");
 160         add_mtd_partitions(&data->mtd, partition_info, 2);
 161         data->init_ok = 1;
 162
 163         res = add_mtd_device(&data->mtd);
 164         if (!res)
 165                 return res;
 166
 167         nand_release(&data->mtd);
 168 out:
 169         platform_set_drvdata(pdev, NULL);
 170         iounmap(data->io_base);
 171         kfree(data);
 172         return res;
 173 }
 174
 175 static int __devexit rbmips_remove(struct platform_device *pdev)
 176 {
 177         struct rb500_nand_info *data = platform_get_drvdata(pdev);
 178
 179         nand_release(&data->mtd);
 180         iounmap(data->io_base);
 181         kfree(data);
 182
 183         return 0;
 184 }
 185
 186 static struct platform_driver rb500_nand_driver = {
 187         .probe          = rbmips_probe,
 188         .remove         = rbmips_remove,
 189         .driver         = {
 190                 .name   = "rb500-nand",
 191                 .owner  = THIS_MODULE,
 192         },
 193 };
 194
 195 static int __init rb500_nand_init(void)
 196 {
 197         int err;
 198         err = platform_driver_register(&rb500_nand_driver);
 199         return err;
 200 }
 201
 202 static void __exit rb500_nand_exit(void)
 203 {
 204         platform_driver_unregister(&rb500_nand_driver);
 205 }
 206
 207 module_init(rb500_nand_init);
 208 module_exit(rb500_nand_exit);
 209
 210 MODULE_LICENSE("GPL");
 211 MODULE_AUTHOR("David Goodenough, Felix Fietkau, Florian Fainelli");
 212 MODULE_DESCRIPTION("RouterBOARD 500 NAND driver");