| /* |
| * drivers/mtd/nand/orion_nand.c |
| * |
| * NAND support for Marvell Orion SoC platforms |
| * |
| * Tzachi Perelstein <tzachi@marvell.com> |
| * |
| * This file is licensed under the terms of the GNU General Public |
| * License version 2. This program is licensed "as is" without any |
| * warranty of any kind, whether express or implied. |
| */ |
| |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/nand.h> |
| #include <linux/mtd/partitions.h> |
| #include <asm/io.h> |
| #include <asm/sizes.h> |
| #include <asm/arch/hardware.h> |
| #include <asm/plat-orion/orion_nand.h> |
| |
| #ifdef CONFIG_MTD_CMDLINE_PARTS |
| static const char *part_probes[] = { "cmdlinepart", NULL }; |
| #endif |
| |
| static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) |
| { |
| struct nand_chip *nc = mtd->priv; |
| struct orion_nand_data *board = nc->priv; |
| u32 offs; |
| |
| if (cmd == NAND_CMD_NONE) |
| return; |
| |
| if (ctrl & NAND_CLE) |
| offs = (1 << board->cle); |
| else if (ctrl & NAND_ALE) |
| offs = (1 << board->ale); |
| else |
| return; |
| |
| if (nc->options & NAND_BUSWIDTH_16) |
| offs <<= 1; |
| |
| writeb(cmd, nc->IO_ADDR_W + offs); |
| } |
| |
| static int __init orion_nand_probe(struct platform_device *pdev) |
| { |
| struct mtd_info *mtd; |
| struct nand_chip *nc; |
| struct orion_nand_data *board; |
| void __iomem *io_base; |
| int ret = 0; |
| #ifdef CONFIG_MTD_PARTITIONS |
| struct mtd_partition *partitions = NULL; |
| int num_part = 0; |
| #endif |
| |
| nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL); |
| if (!nc) { |
| printk(KERN_ERR "orion_nand: failed to allocate device structure.\n"); |
| ret = -ENOMEM; |
| goto no_res; |
| } |
| mtd = (struct mtd_info *)(nc + 1); |
| |
| io_base = ioremap(pdev->resource[0].start, |
| pdev->resource[0].end - pdev->resource[0].start + 1); |
| if (!io_base) { |
| printk(KERN_ERR "orion_nand: ioremap failed\n"); |
| ret = -EIO; |
| goto no_res; |
| } |
| |
| board = pdev->dev.platform_data; |
| |
| mtd->priv = nc; |
| mtd->owner = THIS_MODULE; |
| |
| nc->priv = board; |
| nc->IO_ADDR_R = nc->IO_ADDR_W = io_base; |
| nc->cmd_ctrl = orion_nand_cmd_ctrl; |
| nc->ecc.mode = NAND_ECC_SOFT; |
| |
| if (board->chip_delay) |
| nc->chip_delay = board->chip_delay; |
| |
| if (board->width == 16) |
| nc->options |= NAND_BUSWIDTH_16; |
| |
| platform_set_drvdata(pdev, mtd); |
| |
| if (nand_scan(mtd, 1)) { |
| ret = -ENXIO; |
| goto no_dev; |
| } |
| |
| #ifdef CONFIG_MTD_PARTITIONS |
| #ifdef CONFIG_MTD_CMDLINE_PARTS |
| mtd->name = "orion_nand"; |
| num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0); |
| #endif |
| /* If cmdline partitions have been passed, let them be used */ |
| if (num_part <= 0) { |
| num_part = board->nr_parts; |
| partitions = board->parts; |
| } |
| |
| if (partitions && num_part > 0) |
| ret = add_mtd_partitions(mtd, partitions, num_part); |
| else |
| ret = add_mtd_device(mtd); |
| #else |
| ret = add_mtd_device(mtd); |
| #endif |
| |
| if (ret) { |
| nand_release(mtd); |
| goto no_dev; |
| } |
| |
| return 0; |
| |
| no_dev: |
| platform_set_drvdata(pdev, NULL); |
| iounmap(io_base); |
| no_res: |
| kfree(nc); |
| |
| return ret; |
| } |
| |
| static int __devexit orion_nand_remove(struct platform_device *pdev) |
| { |
| struct mtd_info *mtd = platform_get_drvdata(pdev); |
| struct nand_chip *nc = mtd->priv; |
| |
| nand_release(mtd); |
| |
| iounmap(nc->IO_ADDR_W); |
| |
| kfree(nc); |
| |
| return 0; |
| } |
| |
| static struct platform_driver orion_nand_driver = { |
| .probe = orion_nand_probe, |
| .remove = orion_nand_remove, |
| .driver = { |
| .name = "orion_nand", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static int __init orion_nand_init(void) |
| { |
| return platform_driver_register(&orion_nand_driver); |
| } |
| |
| static void __exit orion_nand_exit(void) |
| { |
| platform_driver_unregister(&orion_nand_driver); |
| } |
| |
| module_init(orion_nand_init); |
| module_exit(orion_nand_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Tzachi Perelstein"); |
| MODULE_DESCRIPTION("NAND glue for Orion platforms"); |
| MODULE_ALIAS("platform:orion_nand"); |