diff options
Diffstat (limited to 'drivers/mtd/nand/orion_nand.c')
| -rw-r--r-- | drivers/mtd/nand/orion_nand.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/mtd/nand/orion_nand.c b/drivers/mtd/nand/orion_nand.c new file mode 100644 index 00000000..1d3bfb26 --- /dev/null +++ b/drivers/mtd/nand/orion_nand.c @@ -0,0 +1,188 @@ +/* + * 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 <mach/hardware.h> +#include <plat/orion_nand.h> + +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 void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) +{ + struct nand_chip *chip = mtd->priv; + void __iomem *io_base = chip->IO_ADDR_R; + uint64_t *buf64; + int i = 0; + + while (len && (unsigned long)buf & 7) { + *buf++ = readb(io_base); + len--; + } + buf64 = (uint64_t *)buf; + while (i < len/8) { + /* + * Since GCC has no proper constraint (PR 43518) + * force x variable to r2/r3 registers as ldrd instruction + * requires first register to be even. + */ + register uint64_t x asm ("r2"); + + asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base)); + buf64[i++] = x; + } + i *= 8; + while (i < len) + buf[i++] = readb(io_base); +} + +static int __init orion_nand_probe(struct platform_device *pdev) +{ + struct mtd_info *mtd; + struct nand_chip *nc; + struct orion_nand_data *board; + struct resource *res; + void __iomem *io_base; + int ret = 0; + + 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); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + ret = -ENODEV; + goto no_res; + } + + io_base = ioremap(res->start, resource_size(res)); + 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->read_buf = orion_nand_read_buf; + 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; + + if (board->dev_ready) + nc->dev_ready = board->dev_ready; + + platform_set_drvdata(pdev, mtd); + + if (nand_scan(mtd, 1)) { + ret = -ENXIO; + goto no_dev; + } + + mtd->name = "orion_nand"; + ret = mtd_device_parse_register(mtd, NULL, NULL, board->parts, + board->nr_parts); + 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 = { + .remove = __devexit_p(orion_nand_remove), + .driver = { + .name = "orion_nand", + .owner = THIS_MODULE, + }, +}; + +static int __init orion_nand_init(void) +{ + return platform_driver_probe(&orion_nand_driver, orion_nand_probe); +} + +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"); |