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mtd: nand: mxs_nand: add device tree support

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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>
This commit is contained in:
Stefan Agner 2018-06-22 18:06:17 +02:00 • committed by Stefano Babic
parent 68748340c8
commit f75e83bfae
4 changed files with 99 additions and 0 deletions
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7
drivers/mtd/nand/Kconfig
View file

@ -154,6 +154,13 @@ config NAND_MXS
if NAND_MXS
config NAND_MXS_DT
bool "Support MXS NAND controller as a DT device"
depends on OF_CONTROL && MTD
help
Enable the driver for MXS NAND flash on platforms using
device tree.
config NAND_MXS_USE_MINIMUM_ECC
bool "Use minimum ECC strength supported by the controller"
default false

1
drivers/mtd/nand/Makefile
View file

@ -55,6 +55,7 @@ obj-$(CONFIG_NAND_LPC32XX_SLC) += lpc32xx_nand_slc.o
obj-$(CONFIG_NAND_VF610_NFC) += vf610_nfc.o
obj-$(CONFIG_NAND_MXC) += mxc_nand.o
obj-$(CONFIG_NAND_MXS) += mxs_nand.o
obj-$(CONFIG_NAND_MXS_DT) += mxs_nand_dt.o
obj-$(CONFIG_NAND_PXA3XX) += pxa3xx_nand.o
obj-$(CONFIG_NAND_SPEAR) += spr_nand.o
obj-$(CONFIG_TEGRA_NAND) += tegra_nand.o

5
drivers/mtd/nand/mxs_nand.c
View file

@ -1201,6 +1201,9 @@ int mxs_nand_init_ctrl(struct mxs_nand_info *nand_info)
nand_set_controller_data(nand, nand_info);
nand->options |= NAND_NO_SUBPAGE_WRITE;
if (nand_info->dev)
nand->flash_node = dev_of_offset(nand_info->dev);
nand->cmd_ctrl = mxs_nand_cmd_ctrl;
nand->dev_ready = mxs_nand_device_ready;
@ -1247,6 +1250,7 @@ err_free_buffers:
return err;
}
#ifndef CONFIG_NAND_MXS_DT
void board_nand_init(void)
{
struct mxs_nand_info *nand_info;
@ -1279,3 +1283,4 @@ void board_nand_init(void)
err:
free(nand_info);
}
#endif

86
drivers/mtd/nand/mxs_nand_dt.c Normal file
View file

@ -0,0 +1,86 @@
/*
* NXP GPMI NAND flash driver (DT initialization)
*
* Copyright (C) 2018 Toradex
* Authors:
* Stefan Agner <stefan.agner@toradex.com>
*
* Based on denali_dt.c
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <dm.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/printk.h>
#include "mxs_nand.h"
struct mxs_nand_dt_data {
unsigned int max_ecc_strength_supported;
};
static const struct mxs_nand_dt_data mxs_nand_imx7d_data = {
.max_ecc_strength_supported = 62,
};
static const struct udevice_id mxs_nand_dt_ids[] = {
{
.compatible = "fsl,imx7d-gpmi-nand",
.data = (unsigned long)&mxs_nand_imx7d_data,
},
{ /* sentinel */ }
};
static int mxs_nand_dt_probe(struct udevice *dev)
{
struct mxs_nand_info *info = dev_get_priv(dev);
const struct mxs_nand_dt_data *data;
struct resource res;
int ret;
data = (void *)dev_get_driver_data(dev);
if (data)
info->max_ecc_strength_supported = data->max_ecc_strength_supported;
info->dev = dev;
ret = dev_read_resource_byname(dev, "gpmi-nand", &res);
if (ret)
return ret;
info->gpmi_regs = devm_ioremap(dev, res.start, resource_size(&res));
ret = dev_read_resource_byname(dev, "bch", &res);
if (ret)
return ret;
info->bch_regs = devm_ioremap(dev, res.start, resource_size(&res));
info->use_minimum_ecc = dev_read_bool(dev, "fsl,use-minimum-ecc");
return mxs_nand_init_ctrl(info);
}
U_BOOT_DRIVER(mxs_nand_dt) = {
.name = "mxs-nand-dt",
.id = UCLASS_MTD,
.of_match = mxs_nand_dt_ids,
.probe = mxs_nand_dt_probe,
.priv_auto_alloc_size = sizeof(struct mxs_nand_info),
};
void board_nand_init(void)
{
struct udevice *dev;
int ret;
ret = uclass_get_device_by_driver(UCLASS_MTD,
DM_GET_DRIVER(mxs_nand_dt),
&dev);
if (ret && ret != -ENODEV)
pr_err("Failed to initialize MXS NAND controller. (error %d)\n",
ret);
}