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mtd: nand: mxs_nand: add device tree support
Support driver data from device tree. Also support fsl,use-minimal-ecc similar to Linux' GPMI NAND driver. Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
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4 changed files with 99 additions and 0 deletions
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@ -154,6 +154,13 @@ config NAND_MXS
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if NAND_MXS
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config NAND_MXS_DT
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bool "Support MXS NAND controller as a DT device"
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depends on OF_CONTROL && MTD
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help
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Enable the driver for MXS NAND flash on platforms using
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device tree.
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config NAND_MXS_USE_MINIMUM_ECC
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bool "Use minimum ECC strength supported by the controller"
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default false
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@ -55,6 +55,7 @@ obj-$(CONFIG_NAND_LPC32XX_SLC) += lpc32xx_nand_slc.o
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obj-$(CONFIG_NAND_VF610_NFC) += vf610_nfc.o
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obj-$(CONFIG_NAND_MXC) += mxc_nand.o
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obj-$(CONFIG_NAND_MXS) += mxs_nand.o
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obj-$(CONFIG_NAND_MXS_DT) += mxs_nand_dt.o
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obj-$(CONFIG_NAND_PXA3XX) += pxa3xx_nand.o
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obj-$(CONFIG_NAND_SPEAR) += spr_nand.o
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obj-$(CONFIG_TEGRA_NAND) += tegra_nand.o
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@ -1201,6 +1201,9 @@ int mxs_nand_init_ctrl(struct mxs_nand_info *nand_info)
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nand_set_controller_data(nand, nand_info);
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nand->options |= NAND_NO_SUBPAGE_WRITE;
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if (nand_info->dev)
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nand->flash_node = dev_of_offset(nand_info->dev);
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nand->cmd_ctrl = mxs_nand_cmd_ctrl;
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nand->dev_ready = mxs_nand_device_ready;
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@ -1247,6 +1250,7 @@ err_free_buffers:
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return err;
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}
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#ifndef CONFIG_NAND_MXS_DT
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void board_nand_init(void)
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{
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struct mxs_nand_info *nand_info;
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@ -1279,3 +1283,4 @@ void board_nand_init(void)
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err:
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free(nand_info);
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}
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#endif
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86
drivers/mtd/nand/mxs_nand_dt.c
Normal file
86
drivers/mtd/nand/mxs_nand_dt.c
Normal file
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@ -0,0 +1,86 @@
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/*
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* NXP GPMI NAND flash driver (DT initialization)
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*
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* Copyright (C) 2018 Toradex
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* Authors:
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* Stefan Agner <stefan.agner@toradex.com>
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*
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* Based on denali_dt.c
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <dm.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/printk.h>
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#include "mxs_nand.h"
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struct mxs_nand_dt_data {
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unsigned int max_ecc_strength_supported;
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};
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static const struct mxs_nand_dt_data mxs_nand_imx7d_data = {
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.max_ecc_strength_supported = 62,
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};
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static const struct udevice_id mxs_nand_dt_ids[] = {
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{
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.compatible = "fsl,imx7d-gpmi-nand",
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.data = (unsigned long)&mxs_nand_imx7d_data,
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},
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{ /* sentinel */ }
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};
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static int mxs_nand_dt_probe(struct udevice *dev)
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{
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struct mxs_nand_info *info = dev_get_priv(dev);
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const struct mxs_nand_dt_data *data;
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struct resource res;
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int ret;
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data = (void *)dev_get_driver_data(dev);
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if (data)
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info->max_ecc_strength_supported = data->max_ecc_strength_supported;
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info->dev = dev;
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ret = dev_read_resource_byname(dev, "gpmi-nand", &res);
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if (ret)
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return ret;
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info->gpmi_regs = devm_ioremap(dev, res.start, resource_size(&res));
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ret = dev_read_resource_byname(dev, "bch", &res);
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if (ret)
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return ret;
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info->bch_regs = devm_ioremap(dev, res.start, resource_size(&res));
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info->use_minimum_ecc = dev_read_bool(dev, "fsl,use-minimum-ecc");
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return mxs_nand_init_ctrl(info);
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}
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U_BOOT_DRIVER(mxs_nand_dt) = {
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.name = "mxs-nand-dt",
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.id = UCLASS_MTD,
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.of_match = mxs_nand_dt_ids,
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.probe = mxs_nand_dt_probe,
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.priv_auto_alloc_size = sizeof(struct mxs_nand_info),
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};
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void board_nand_init(void)
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{
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struct udevice *dev;
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int ret;
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ret = uclass_get_device_by_driver(UCLASS_MTD,
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DM_GET_DRIVER(mxs_nand_dt),
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&dev);
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if (ret && ret != -ENODEV)
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pr_err("Failed to initialize MXS NAND controller. (error %d)\n",
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ret);
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}
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