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

   1 /*
   2  * drivers/mtd/nand/orion_nand.c
   3  *
   4  * NAND support for Marvell Orion SoC platforms
   5  *
   6  * Tzachi Perelstein <tzachi@marvell.com>
   7  *
   8  * This file is licensed under  the terms of the GNU General Public
   9  * License version 2. This program is licensed "as is" without any
  10  * warranty of any kind, whether express or implied.
  11  */
  12
  13 #include <linux/slab.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/nand.h>
  18 #include <linux/mtd/partitions.h>
  19 #include <asm/io.h>
  20 #include <asm/sizes.h>
  21 #include <mach/hardware.h>
  22 #include <plat/orion_nand.h>
  23
  24 #ifdef CONFIG_MTD_CMDLINE_PARTS
  25 static const char *part_probes[] = { "cmdlinepart", NULL };
  26 #endif
  27
  28 static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  29 {
  30         struct nand_chip *nc = mtd->priv;
  31         struct orion_nand_data *board = nc->priv;
  32         u32 offs;
  33
  34         if (cmd == NAND_CMD_NONE)
  35                 return;
  36
  37         if (ctrl & NAND_CLE)
  38                 offs = (1 << board->cle);
  39         else if (ctrl & NAND_ALE)
  40                 offs = (1 << board->ale);
  41         else
  42                 return;
  43
  44         if (nc->options & NAND_BUSWIDTH_16)
  45                 offs <<= 1;
  46
  47         writeb(cmd, nc->IO_ADDR_W + offs);
  48 }
  49
  50 static int __init orion_nand_probe(struct platform_device *pdev)
  51 {
  52         struct mtd_info *mtd;
  53         struct nand_chip *nc;
  54         struct orion_nand_data *board;
  55         void __iomem *io_base;
  56         int ret = 0;
  57 #ifdef CONFIG_MTD_PARTITIONS
  58         struct mtd_partition *partitions = NULL;
  59         int num_part = 0;
  60 #endif
  61
  62         nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
  63         if (!nc) {
  64                 printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
  65                 ret = -ENOMEM;
  66                 goto no_res;
  67         }
  68         mtd = (struct mtd_info *)(nc + 1);
  69
  70         io_base = ioremap(pdev->resource[0].start,
  71                         pdev->resource[0].end - pdev->resource[0].start + 1);
  72         if (!io_base) {
  73                 printk(KERN_ERR "orion_nand: ioremap failed\n");
  74                 ret = -EIO;
  75                 goto no_res;
  76         }
  77
  78         board = pdev->dev.platform_data;
  79
  80         mtd->priv = nc;
  81         mtd->owner = THIS_MODULE;
  82
  83         nc->priv = board;
  84         nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
  85         nc->cmd_ctrl = orion_nand_cmd_ctrl;
  86         nc->ecc.mode = NAND_ECC_SOFT;
  87
  88         if (board->chip_delay)
  89                 nc->chip_delay = board->chip_delay;
  90
  91         if (board->width == 16)
  92                 nc->options |= NAND_BUSWIDTH_16;
  93
  94         platform_set_drvdata(pdev, mtd);
  95
  96         if (nand_scan(mtd, 1)) {
  97                 ret = -ENXIO;
  98                 goto no_dev;
  99         }
 100
 101 #ifdef CONFIG_MTD_PARTITIONS
 102 #ifdef CONFIG_MTD_CMDLINE_PARTS
 103         mtd->name = "orion_nand";
 104         num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
 105 #endif
 106         /* If cmdline partitions have been passed, let them be used */
 107         if (num_part <= 0) {
 108                 num_part = board->nr_parts;
 109                 partitions = board->parts;
 110         }
 111
 112         if (partitions && num_part > 0)
 113                 ret = add_mtd_partitions(mtd, partitions, num_part);
 114         else
 115                 ret = add_mtd_device(mtd);
 116 #else
 117         ret = add_mtd_device(mtd);
 118 #endif
 119
 120         if (ret) {
 121                 nand_release(mtd);
 122                 goto no_dev;
 123         }
 124
 125         return 0;
 126
 127 no_dev:
 128         platform_set_drvdata(pdev, NULL);
 129         iounmap(io_base);
 130 no_res:
 131         kfree(nc);
 132
 133         return ret;
 134 }
 135
 136 static int __devexit orion_nand_remove(struct platform_device *pdev)
 137 {
 138         struct mtd_info *mtd = platform_get_drvdata(pdev);
 139         struct nand_chip *nc = mtd->priv;
 140
 141         nand_release(mtd);
 142
 143         iounmap(nc->IO_ADDR_W);
 144
 145         kfree(nc);
 146
 147         return 0;
 148 }
 149
 150 static struct platform_driver orion_nand_driver = {
 151         .probe          = orion_nand_probe,
 152         .remove         = __devexit_p(orion_nand_remove),
 153         .driver         = {
 154                 .name   = "orion_nand",
 155                 .owner  = THIS_MODULE,
 156         },
 157 };
 158
 159 static int __init orion_nand_init(void)
 160 {
 161         return platform_driver_register(&orion_nand_driver);
 162 }
 163
 164 static void __exit orion_nand_exit(void)
 165 {
 166         platform_driver_unregister(&orion_nand_driver);
 167 }
 168
 169 module_init(orion_nand_init);
 170 module_exit(orion_nand_exit);
 171
 172 MODULE_LICENSE("GPL");
 173 MODULE_AUTHOR("Tzachi Perelstein");
 174 MODULE_DESCRIPTION("NAND glue for Orion platforms");
 175 MODULE_ALIAS("platform:orion_nand");