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 void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
  51 {
  52         struct nand_chip *chip = mtd->priv;
  53         void __iomem *io_base = chip->IO_ADDR_R;
  54         uint64_t *buf64;
  55         int i = 0;
  56
  57         while (len && (unsigned long)buf & 7) {
  58                 *buf++ = readb(io_base);
  59                 len--;
  60         }
  61         buf64 = (uint64_t *)buf;
  62         while (i < len/8) {
  63                 uint64_t x;
  64                 asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
  65                 buf64[i++] = x;
  66         }
  67         i *= 8;
  68         while (i < len)
  69                 buf[i++] = readb(io_base);
  70 }
  71
  72 static int __init orion_nand_probe(struct platform_device *pdev)
  73 {
  74         struct mtd_info *mtd;
  75         struct nand_chip *nc;
  76         struct orion_nand_data *board;
  77         void __iomem *io_base;
  78         int ret = 0;
  79 #ifdef CONFIG_MTD_PARTITIONS
  80         struct mtd_partition *partitions = NULL;
  81         int num_part = 0;
  82 #endif
  83
  84         nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
  85         if (!nc) {
  86                 printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
  87                 ret = -ENOMEM;
  88                 goto no_res;
  89         }
  90         mtd = (struct mtd_info *)(nc + 1);
  91
  92         io_base = ioremap(pdev->resource[0].start,
  93                         pdev->resource[0].end - pdev->resource[0].start + 1);
  94         if (!io_base) {
  95                 printk(KERN_ERR "orion_nand: ioremap failed\n");
  96                 ret = -EIO;
  97                 goto no_res;
  98         }
  99
 100         board = pdev->dev.platform_data;
 101
 102         mtd->priv = nc;
 103         mtd->owner = THIS_MODULE;
 104
 105         nc->priv = board;
 106         nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
 107         nc->cmd_ctrl = orion_nand_cmd_ctrl;
 108         nc->read_buf = orion_nand_read_buf;
 109         nc->ecc.mode = NAND_ECC_SOFT;
 110
 111         if (board->chip_delay)
 112                 nc->chip_delay = board->chip_delay;
 113
 114         if (board->width == 16)
 115                 nc->options |= NAND_BUSWIDTH_16;
 116
 117         platform_set_drvdata(pdev, mtd);
 118
 119         if (nand_scan(mtd, 1)) {
 120                 ret = -ENXIO;
 121                 goto no_dev;
 122         }
 123
 124 #ifdef CONFIG_MTD_PARTITIONS
 125 #ifdef CONFIG_MTD_CMDLINE_PARTS
 126         mtd->name = "orion_nand";
 127         num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
 128 #endif
 129         /* If cmdline partitions have been passed, let them be used */
 130         if (num_part <= 0) {
 131                 num_part = board->nr_parts;
 132                 partitions = board->parts;
 133         }
 134
 135         if (partitions && num_part > 0)
 136                 ret = add_mtd_partitions(mtd, partitions, num_part);
 137         else
 138                 ret = add_mtd_device(mtd);
 139 #else
 140         ret = add_mtd_device(mtd);
 141 #endif
 142
 143         if (ret) {
 144                 nand_release(mtd);
 145                 goto no_dev;
 146         }
 147
 148         return 0;
 149
 150 no_dev:
 151         platform_set_drvdata(pdev, NULL);
 152         iounmap(io_base);
 153 no_res:
 154         kfree(nc);
 155
 156         return ret;
 157 }
 158
 159 static int __devexit orion_nand_remove(struct platform_device *pdev)
 160 {
 161         struct mtd_info *mtd = platform_get_drvdata(pdev);
 162         struct nand_chip *nc = mtd->priv;
 163
 164         nand_release(mtd);
 165
 166         iounmap(nc->IO_ADDR_W);
 167
 168         kfree(nc);
 169
 170         return 0;
 171 }
 172
 173 static struct platform_driver orion_nand_driver = {
 174         .remove         = __devexit_p(orion_nand_remove),
 175         .driver         = {
 176                 .name   = "orion_nand",
 177                 .owner  = THIS_MODULE,
 178         },
 179 };
 180
 181 static int __init orion_nand_init(void)
 182 {
 183         return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
 184 }
 185
 186 static void __exit orion_nand_exit(void)
 187 {
 188         platform_driver_unregister(&orion_nand_driver);
 189 }
 190
 191 module_init(orion_nand_init);
 192 module_exit(orion_nand_exit);
 193
 194 MODULE_LICENSE("GPL");
 195 MODULE_AUTHOR("Tzachi Perelstein");
 196 MODULE_DESCRIPTION("NAND glue for Orion platforms");
 197 MODULE_ALIAS("platform:orion_nand");