target/linux/rb532/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 extern unsigned int board_type;
  37
  38 struct rb500_nand_info {
  39         struct nand_chip chip;
  40         struct mtd_info mtd;
  41         void __iomem *io_base;
  42 #ifdef CONFIG_MTD_PARTITIONS
  43         int     nr_parts;
  44         struct mtd_partition *parts;
  45 #endif
  46         int     init_ok;
  47         int     flags1;
  48         int     flags2;
  49 };
  50
  51 static struct mtd_partition partition_info[] = {
  52         {
  53               name:"RouterBoard NAND Boot",
  54               offset:0,
  55       size:4 * 1024 * 1024},
  56         {
  57               name:"rootfs",
  58               offset:MTDPART_OFS_NXTBLK,
  59         size:MTDPART_SIZ_FULL}
  60 };
  61
  62 extern void changeLatchU5(unsigned char orMask, unsigned char nandMask);
  63
  64 static int rb500_dev_ready(struct mtd_info *mtd)
  65 {
  66         return MEM32(IDT434_REG_BASE + GPIOD) & GPIO_RDY;
  67 }
  68
  69 /*
  70  * hardware specific access to control-lines
  71  *
  72  * ctrl:
  73  *     NAND_CLE: bit 2 -> bit 3
  74  *     NAND_ALE: bit 3 -> bit 2
  75  */
  76 static void rbmips_hwcontrol500(struct mtd_info *mtd, int cmd,
  77                                 unsigned int ctrl)
  78 {
  79         struct nand_chip *chip = mtd->priv;
  80         unsigned char orbits, nandbits;
  81
  82         if (ctrl & NAND_CTRL_CHANGE) {
  83
  84                 orbits = (ctrl & NAND_CLE) << 1;
  85                 orbits |= (ctrl & NAND_ALE) >> 1;
  86
  87                 nandbits = (~ctrl & NAND_CLE) << 1;
  88                 nandbits |= (~ctrl & NAND_ALE) >> 1;
  89
  90                 changeLatchU5(orbits, nandbits);
  91         }
  92         if (cmd != NAND_CMD_NONE)
  93                 writeb(cmd, chip->IO_ADDR_W);
  94
  95 }
  96
  97 unsigned get_rbnand_block_size(struct rb500_nand_info *data)
  98 {
  99         if (data->init_ok)
 100                 return data->mtd.writesize;
 101         else
 102                 return 0;
 103 }
 104
 105 EXPORT_SYMBOL(get_rbnand_block_size);
 106
 107 static int rbmips_probe(struct platform_device *pdev)
 108 {
 109         struct rb500_nand_info *data;
 110         int res = 0;
 111         int *b;
 112
 113         /* Allocate memory for the structure */
 114         data = kzalloc(sizeof(*data), GFP_KERNEL);
 115         if (!data) {
 116                 dev_err(&pdev->dev, "Failed to allocate device structure\n");
 117                 return -ENOMEM;
 118         }
 119
 120         data->io_base = ioremap(pdev->resource[0].start, pdev->resource[0].end - pdev->resource[0].start + 1);
 121
 122         if (data->io_base == NULL) {
 123                 dev_err(&pdev->dev, "ioremap failed\n");
 124                 kfree(data);
 125                 return -EIO;
 126         }
 127
 128         if (board_type > 500) {
 129                 data->flags1 = LO_FOFF | LO_CEX;
 130                 data->flags2 = LO_ULED | LO_ALE | LO_CLE | LO_WPX;
 131         }
 132         else {
 133                 data->flags1 = LO_WPX | LO_FOFF | LO_CEX;
 134                 data->flags2 = LO_ULED | LO_ALE | LO_CLE;
 135         }
 136
 137         changeLatchU5(data->flags1, data->flags2);
 138
 139         data->chip.cmd_ctrl = rbmips_hwcontrol500;
 140
 141         data->chip.dev_ready = rb500_dev_ready;
 142         data->chip.IO_ADDR_W = (unsigned char *)KSEG1ADDR(MEM32(IDT434_REG_BASE + DEV2BASE));
 143         data->chip.IO_ADDR_R = data->chip.IO_ADDR_W;
 144
 145         data->chip.ecc.mode = NAND_ECC_SOFT;
 146         data->chip.chip_delay = 25;
 147         data->chip.options |= NAND_NO_AUTOINCR;
 148
 149         data->chip.priv = &data;
 150         data->mtd.priv = &data->chip;
 151         data->mtd.owner = THIS_MODULE;
 152
 153         b = (int *) KSEG1ADDR(0x18010020);
 154         printk("dev2base 0x%08x mask 0x%08x c 0x%08x tc 0x%08x\n", b[0],
 155                b[1], b[2], b[3]);
 156
 157         platform_set_drvdata(pdev, data);
 158
 159         /* Why do we need to scan 4 times ? */
 160         if (nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1)  && nand_scan(&data->mtd, 1)) {
 161                 printk(KERN_INFO "RB500 nand device not found\n");
 162                 res = -ENXIO;
 163                 goto out;
 164         }
 165
 166         printk(KERN_INFO "RB500 NAND\n");
 167         add_mtd_partitions(&data->mtd, partition_info, 2);
 168         data->init_ok = 1;
 169
 170         res = add_mtd_device(&data->mtd);
 171         if (!res)
 172                 return res;
 173
 174         nand_release(&data->mtd);
 175 out:
 176         platform_set_drvdata(pdev, NULL);
 177         iounmap(data->io_base);
 178         kfree(data);
 179         return res;
 180 }
 181
 182 static int __devexit rbmips_remove(struct platform_device *pdev)
 183 {
 184         struct rb500_nand_info *data = platform_get_drvdata(pdev);
 185
 186         nand_release(&data->mtd);
 187         iounmap(data->io_base);
 188         kfree(data);
 189
 190         return 0;
 191 }
 192
 193 static struct platform_driver rb500_nand_driver = {
 194         .probe          = rbmips_probe,
 195         .remove         = rbmips_remove,
 196         .driver         = {
 197                 .name   = "rb500-nand",
 198                 .owner  = THIS_MODULE,
 199         },
 200 };
 201
 202 static int __init rb500_nand_init(void)
 203 {
 204         int err;
 205         err = platform_driver_register(&rb500_nand_driver);
 206         return err;
 207 }
 208
 209 static void __exit rb500_nand_exit(void)
 210 {
 211         platform_driver_unregister(&rb500_nand_driver);
 212 }
 213
 214 module_init(rb500_nand_init);
 215 module_exit(rb500_nand_exit);
 216
 217 MODULE_LICENSE("GPL");
 218 MODULE_AUTHOR("David Goodenough, Felix Fietkau, Florian Fainelli");
 219 MODULE_DESCRIPTION("RouterBOARD 500 NAND driver");