/*
 * NAND Flash Controller Device Driver for DT
 *
 * Copyright © 2011, Picochip.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <common.h>
#include <driver.h>
#include <malloc.h>
#include <init.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <io.h>
#include <of_mtd.h>
#include <errno.h>

#include <linux/clk.h>
#include <linux/spinlock.h>


#include "denali.h"

struct denali_dt {
	struct denali_controller	denali;
	struct clk *clk;	/* core clock */
	struct clk *clk_x;	/* bus interface clock */
	struct clk *clk_ecc;	/* ECC circuit clock */
};

struct denali_dt_data {
	unsigned int revision;
	unsigned int caps;
	unsigned int oob_skip_bytes;
	const  struct nand_ecc_caps *ecc_caps;
};

NAND_ECC_CAPS_SINGLE(denali_socfpga_ecc_caps, denali_calc_ecc_bytes,
		     512, 8, 15);
static const struct denali_dt_data denali_socfpga_data = {
	.caps = DENALI_CAP_HW_ECC_FIXUP,
	.oob_skip_bytes = 2,
	.ecc_caps = &denali_socfpga_ecc_caps,
};

static int denali_dt_chip_init(struct denali_controller *denali,
			       struct device_node *chip_np)
{
	struct denali_chip *dchip;
	u32 bank;
	int nsels, i, ret;

	nsels = of_property_count_elems_of_size(chip_np, "reg", sizeof(u32));
	if (nsels < 0)
		return nsels;

	dchip = xzalloc(sizeof(*dchip) + sizeof(struct denali_chip_sel) *nsels);

	dchip->nsels = nsels;

	for (i = 0; i < nsels; i++) {
		ret = of_property_read_u32_index(chip_np, "reg", i, &bank);
		if (ret)
			return ret;

		dchip->sels[i].bank = bank;

		nand_set_flash_node(&dchip->chip, chip_np);
	}

	return denali_chip_init(denali, dchip);
}

static int denali_dt_probe(struct device_d *ofdev)
{
	struct resource *iores;
	struct denali_dt *dt;
	struct denali_controller *denali;
	struct denali_dt_data *data;
	struct device_node *np;
	int ret;

	if (!IS_ENABLED(CONFIG_OFDEVICE))
		return 1;

	ret = dev_get_drvdata(ofdev, (const void **)&data);
	if (ret)
		return ret;

	dt = kzalloc(sizeof(*dt), GFP_KERNEL);
	if (!dt)
		return -ENOMEM;
	denali = &dt->denali;

	denali->dev = ofdev;

	iores = dev_request_mem_resource(ofdev, 0);
	if (IS_ERR(iores))
		return PTR_ERR(iores);
	denali->host = IOMEM(iores->start);

	iores = dev_request_mem_resource(ofdev, 1);
	if (IS_ERR(iores))
		return PTR_ERR(iores);
	denali->reg = IOMEM(iores->start);

	dt->clk = clk_get(ofdev, "nand");
	if (IS_ERR(dt->clk))
		return PTR_ERR(dt->clk);

	dt->clk_x = clk_get(ofdev, "nand_x");
	if (IS_ERR(dt->clk_x))
		return PTR_ERR(dt->clk_x);

	dt->clk_ecc = clk_get(ofdev, "ecc");
	if (IS_ERR(dt->clk_ecc))
		return PTR_ERR(dt->clk_ecc);

	clk_enable(dt->clk);
	clk_enable(dt->clk_x);
	clk_enable(dt->clk_ecc);

	denali->clk_rate = clk_get_rate(dt->clk);
	denali->clk_x_rate = clk_get_rate(dt->clk_x);

	denali->revision = data->revision;
	denali->caps = data->caps;
	denali->oob_skip_bytes = data->oob_skip_bytes;
	denali->ecc_caps = data->ecc_caps;

	ret = denali_init(denali);
	if (ret)
		goto out_disable_clk;

	for_each_child_of_node(ofdev->device_node, np) {
		ret = denali_dt_chip_init(denali, np);
		if (ret)
			goto out_disable_clk;
	}

	return 0;

out_disable_clk:
	clk_disable(dt->clk);

	return ret;
}

static __maybe_unused struct of_device_id denali_nand_compatible[] = {
	{
		.compatible = "altr,socfpga-denali-nand",
		.data = &denali_socfpga_data,
	}, {
		/* sentinel */
	}
};

static struct driver_d denali_dt_driver = {
	.name	= "denali-nand-dt",
	.probe		= denali_dt_probe,
	.of_compatible = DRV_OF_COMPAT(denali_nand_compatible)
};
device_platform_driver(denali_dt_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jamie Iles");
MODULE_DESCRIPTION("DT driver for Denali NAND controller");