diff options
Diffstat (limited to 'target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c')
| -rw-r--r-- | target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c | 206 |
1 files changed, 0 insertions, 206 deletions
diff --git a/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c b/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c deleted file mode 100644 index 36807b7..0000000 --- a/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c +++ /dev/null @@ -1,206 +0,0 @@ -/* - * Oxford Semiconductor OXNAS NAND driver - - * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com> - * Heavily based on plat_nand.c : - * Author: Vitaly Wool <vitalywool@gmail.com> - * Copyright (C) 2013 Ma Haijun <mahaijuns@gmail.com> - * Copyright (C) 2012 John Crispin <blogic@openwrt.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - */ - -#include <linux/err.h> -#include <linux/io.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/clk.h> -#include <linux/reset.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/nand.h> -#include <linux/mtd/partitions.h> -#include <linux/of.h> - -/* Nand commands */ -#define OXNAS_NAND_CMD_ALE BIT(18) -#define OXNAS_NAND_CMD_CLE BIT(19) - -#define OXNAS_NAND_MAX_CHIPS 1 - -struct oxnas_nand { - struct nand_hw_control base; - void __iomem *io_base; - struct clk *clk; - struct nand_chip *chips[OXNAS_NAND_MAX_CHIPS]; - unsigned long ctrl; - struct mtd_partition *partitions; - int nr_partitions; -}; - -static uint8_t oxnas_nand_read_byte(struct mtd_info *mtd) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - struct oxnas_nand *oxnas = nand_get_controller_data(chip); - - return readb(oxnas->io_base); -} - -static void oxnas_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - struct oxnas_nand *oxnas = nand_get_controller_data(chip); - - ioread8_rep(oxnas->io_base, buf, len); -} - -static void oxnas_nand_write_buf(struct mtd_info *mtd, - const uint8_t *buf, int len) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - struct oxnas_nand *oxnas = nand_get_controller_data(chip); - - iowrite8_rep(oxnas->io_base + oxnas->ctrl, buf, len); -} - -/* Single CS command control */ -static void oxnas_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, - unsigned int ctrl) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - struct oxnas_nand *oxnas = nand_get_controller_data(chip); - - if (ctrl & NAND_CTRL_CHANGE) { - if (ctrl & NAND_CLE) - oxnas->ctrl = OXNAS_NAND_CMD_CLE; - else if (ctrl & NAND_ALE) - oxnas->ctrl = OXNAS_NAND_CMD_ALE; - else - oxnas->ctrl = 0; - } - - if (cmd != NAND_CMD_NONE) - writeb(cmd, oxnas->io_base + oxnas->ctrl); -} - -/* - * Probe for the NAND device. - */ -static int oxnas_nand_probe(struct platform_device *pdev) -{ - struct device_node *np = pdev->dev.of_node; - struct device_node *nand_np; - struct oxnas_nand *oxnas; - struct nand_chip *chip; - struct mtd_info *mtd; - struct resource *res; - int nchips = 0; - int count = 0; - int err = 0; - - /* Allocate memory for the device structure (and zero it) */ - oxnas = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip), - GFP_KERNEL); - if (!oxnas) - return -ENOMEM; - - nand_hw_control_init(&oxnas->base); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - oxnas->io_base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(oxnas->io_base)) - return PTR_ERR(oxnas->io_base); - - oxnas->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(oxnas->clk)) - oxnas->clk = NULL; - - /* Only a single chip node is supported */ - count = of_get_child_count(np); - if (count > 1) - return -EINVAL; - - clk_prepare_enable(oxnas->clk); - device_reset_optional(&pdev->dev); - - for_each_child_of_node(np, nand_np) { - chip = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip), - GFP_KERNEL); - if (!chip) - return -ENOMEM; - - chip->controller = &oxnas->base; - - nand_set_flash_node(chip, nand_np); - nand_set_controller_data(chip, oxnas); - - mtd = nand_to_mtd(chip); - mtd->dev.parent = &pdev->dev; - mtd->priv = chip; - - chip->cmd_ctrl = oxnas_nand_cmd_ctrl; - chip->read_buf = oxnas_nand_read_buf; - chip->read_byte = oxnas_nand_read_byte; - chip->write_buf = oxnas_nand_write_buf; - chip->chip_delay = 30; - - /* Scan to find existence of the device */ - err = nand_scan(mtd, 1); - if (err) - return err; - - err = mtd_device_register(mtd, NULL, 0); - if (err) { - nand_release(mtd); - return err; - } - - oxnas->chips[nchips] = chip; - ++nchips; - } - - /* Exit if no chips found */ - if (!nchips) - return -ENODEV; - - platform_set_drvdata(pdev, oxnas); - - return 0; -} - -static int oxnas_nand_remove(struct platform_device *pdev) -{ - struct oxnas_nand *oxnas = platform_get_drvdata(pdev); - - if (oxnas->chips[0]) - nand_release(nand_to_mtd(oxnas->chips[0])); - - clk_disable_unprepare(oxnas->clk); - - return 0; -} - -static const struct of_device_id oxnas_nand_match[] = { - { .compatible = "oxsemi,ox820-nand" }, - {}, -}; -MODULE_DEVICE_TABLE(of, oxnas_nand_match); - -static struct platform_driver oxnas_nand_driver = { - .probe = oxnas_nand_probe, - .remove = oxnas_nand_remove, - .driver = { - .name = "oxnas_nand", - .of_match_table = oxnas_nand_match, - }, -}; - -module_platform_driver(oxnas_nand_driver); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); -MODULE_DESCRIPTION("Oxnas NAND driver"); -MODULE_ALIAS("platform:oxnas_nand"); |