diff options
Diffstat (limited to 'drivers/mtd/nand/raw/orion_nand.c')
| -rw-r--r-- | drivers/mtd/nand/raw/orion_nand.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/orion_nand.c b/drivers/mtd/nand/raw/orion_nand.c new file mode 100644 index 0000000..7825fd3 --- /dev/null +++ b/drivers/mtd/nand/raw/orion_nand.c @@ -0,0 +1,232 @@ +/* + * 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/of.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/rawnand.h> +#include <linux/mtd/partitions.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <asm/sizes.h> +#include <linux/platform_data/mtd-orion_nand.h> + +struct orion_nand_info { + struct nand_chip chip; + struct clk *clk; +}; + +static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) +{ + struct nand_chip *nc = mtd_to_nand(mtd); + struct orion_nand_data *board = nand_get_controller_data(nc); + 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_to_nand(mtd); + void __iomem *io_base = chip->IO_ADDR_R; +#if __LINUX_ARM_ARCH__ >= 5 + uint64_t *buf64; +#endif + int i = 0; + + while (len && (unsigned long)buf & 7) { + *buf++ = readb(io_base); + len--; + } +#if __LINUX_ARM_ARCH__ >= 5 + 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; +#else + readsl(io_base, buf, len/4); + i = len / 4 * 4; +#endif + while (i < len) + buf[i++] = readb(io_base); +} + +static int __init orion_nand_probe(struct platform_device *pdev) +{ + struct orion_nand_info *info; + struct mtd_info *mtd; + struct nand_chip *nc; + struct orion_nand_data *board; + struct resource *res; + void __iomem *io_base; + int ret = 0; + u32 val = 0; + + info = devm_kzalloc(&pdev->dev, + sizeof(struct orion_nand_info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + nc = &info->chip; + mtd = nand_to_mtd(nc); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + io_base = devm_ioremap_resource(&pdev->dev, res); + + if (IS_ERR(io_base)) + return PTR_ERR(io_base); + + if (pdev->dev.of_node) { + board = devm_kzalloc(&pdev->dev, sizeof(struct orion_nand_data), + GFP_KERNEL); + if (!board) + return -ENOMEM; + if (!of_property_read_u32(pdev->dev.of_node, "cle", &val)) + board->cle = (u8)val; + else + board->cle = 0; + if (!of_property_read_u32(pdev->dev.of_node, "ale", &val)) + board->ale = (u8)val; + else + board->ale = 1; + if (!of_property_read_u32(pdev->dev.of_node, + "bank-width", &val)) + board->width = (u8)val * 8; + else + board->width = 8; + if (!of_property_read_u32(pdev->dev.of_node, + "chip-delay", &val)) + board->chip_delay = (u8)val; + } else { + board = dev_get_platdata(&pdev->dev); + } + + mtd->dev.parent = &pdev->dev; + + nand_set_controller_data(nc, board); + nand_set_flash_node(nc, pdev->dev.of_node); + 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; + nc->ecc.algo = NAND_ECC_HAMMING; + + if (board->chip_delay) + nc->chip_delay = board->chip_delay; + + WARN(board->width > 16, + "%d bit bus width out of range", + board->width); + + if (board->width == 16) + nc->options |= NAND_BUSWIDTH_16; + + if (board->dev_ready) + nc->dev_ready = board->dev_ready; + + platform_set_drvdata(pdev, info); + + /* Not all platforms can gate the clock, so it is not + an error if the clock does not exists. */ + info->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(info->clk)) { + ret = PTR_ERR(info->clk); + if (ret == -ENOENT) { + info->clk = NULL; + } else { + dev_err(&pdev->dev, "failed to get clock!\n"); + return ret; + } + } + + ret = clk_prepare_enable(info->clk); + if (ret) { + dev_err(&pdev->dev, "failed to prepare clock!\n"); + return ret; + } + + ret = nand_scan(mtd, 1); + if (ret) + goto no_dev; + + mtd->name = "orion_nand"; + ret = mtd_device_register(mtd, board->parts, board->nr_parts); + if (ret) { + nand_release(mtd); + goto no_dev; + } + + return 0; + +no_dev: + clk_disable_unprepare(info->clk); + return ret; +} + +static int orion_nand_remove(struct platform_device *pdev) +{ + struct orion_nand_info *info = platform_get_drvdata(pdev); + struct nand_chip *chip = &info->chip; + struct mtd_info *mtd = nand_to_mtd(chip); + + nand_release(mtd); + + clk_disable_unprepare(info->clk); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id orion_nand_of_match_table[] = { + { .compatible = "marvell,orion-nand", }, + {}, +}; +MODULE_DEVICE_TABLE(of, orion_nand_of_match_table); +#endif + +static struct platform_driver orion_nand_driver = { + .remove = orion_nand_remove, + .driver = { + .name = "orion_nand", + .of_match_table = of_match_ptr(orion_nand_of_match_table), + }, +}; + +module_platform_driver_probe(orion_nand_driver, orion_nand_probe); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Tzachi Perelstein"); +MODULE_DESCRIPTION("NAND glue for Orion platforms"); +MODULE_ALIAS("platform:orion_nand"); |
