[deliverable/linux.git] / drivers / mtd / nand / brcmnand / bcm63138_nand.c

/*
 * Copyright © 2015 Broadcom Corporation
 *
 * 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.
 *
 * This program is distributed in the hope that 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 <linux/device.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include "brcmnand.h"

struct bcm63138_nand_soc {
	struct brcmnand_soc soc;
	void __iomem *base;
};

#define BCM63138_NAND_INT_STATUS		0x00
#define BCM63138_NAND_INT_EN			0x04

enum {
	BCM63138_CTLRDY		= BIT(4),
};

static bool bcm63138_nand_intc_ack(struct brcmnand_soc *soc)
{
	struct bcm63138_nand_soc *priv =
			container_of(soc, struct bcm63138_nand_soc, soc);
	void __iomem *mmio = priv->base + BCM63138_NAND_INT_STATUS;
	u32 val = brcmnand_readl(mmio);

	if (val & BCM63138_CTLRDY) {
		brcmnand_writel(val & ~BCM63138_CTLRDY, mmio);
		return true;
	}

	return false;
}

static void bcm63138_nand_intc_set(struct brcmnand_soc *soc, bool en)
{
	struct bcm63138_nand_soc *priv =
			container_of(soc, struct bcm63138_nand_soc, soc);
	void __iomem *mmio = priv->base + BCM63138_NAND_INT_EN;
	u32 val = brcmnand_readl(mmio);

	if (en)
		val |= BCM63138_CTLRDY;
	else
		val &= ~BCM63138_CTLRDY;

	brcmnand_writel(val, mmio);
}

static int bcm63138_nand_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct bcm63138_nand_soc *priv;
	struct brcmnand_soc *soc;
	struct resource *res;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;
	soc = &priv->soc;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-int-base");
	priv->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(priv->base))
		return PTR_ERR(priv->base);

	soc->ctlrdy_ack = bcm63138_nand_intc_ack;
	soc->ctlrdy_set_enabled = bcm63138_nand_intc_set;

	return brcmnand_probe(pdev, soc);
}

static const struct of_device_id bcm63138_nand_of_match[] = {
	{ .compatible = "brcm,nand-bcm63138" },
	{},
};
MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);

static struct platform_driver bcm63138_nand_driver = {
	.probe			= bcm63138_nand_probe,
	.remove			= brcmnand_remove,
	.driver = {
		.name		= "bcm63138_nand",
		.pm		= &brcmnand_pm_ops,
		.of_match_table	= bcm63138_nand_of_match,
	}
};
module_platform_driver(bcm63138_nand_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Brian Norris");
MODULE_DESCRIPTION("NAND driver for BCM63138");
Commit	Line	Data
f628ece6 BN	1	/*
	2	* Copyright © 2015 Broadcom Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*/
	13
	14	#include <linux/device.h>
	15	#include <linux/io.h>
	16	#include <linux/ioport.h>
	17	#include <linux/module.h>
	18	#include <linux/of.h>
	19	#include <linux/of_address.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/slab.h>
	22
	23	#include "brcmnand.h"
	24
7af67226 BN	25	struct bcm63138_nand_soc {
7af67226 BN	26	struct brcmnand_soc soc;
f628ece6 BN	27	void __iomem *base;
	28	};
	29
	30	#define BCM63138_NAND_INT_STATUS 0x00
	31	#define BCM63138_NAND_INT_EN 0x04
	32
	33	enum {
	34	BCM63138_CTLRDY = BIT(4),
	35	};
	36
	37	static bool bcm63138_nand_intc_ack(struct brcmnand_soc *soc)
	38	{
7af67226 BN	39	struct bcm63138_nand_soc *priv =
7af67226 BN	40	container_of(soc, struct bcm63138_nand_soc, soc);
f628ece6 BN	41	void __iomem *mmio = priv->base + BCM63138_NAND_INT_STATUS;
	42	u32 val = brcmnand_readl(mmio);
	43
	44	if (val & BCM63138_CTLRDY) {
	45	brcmnand_writel(val & ~BCM63138_CTLRDY, mmio);
	46	return true;
	47	}
	48
	49	return false;
	50	}
	51
	52	static void bcm63138_nand_intc_set(struct brcmnand_soc *soc, bool en)
	53	{
7af67226 BN	54	struct bcm63138_nand_soc *priv =
7af67226 BN	55	container_of(soc, struct bcm63138_nand_soc, soc);
f628ece6 BN	56	void __iomem *mmio = priv->base + BCM63138_NAND_INT_EN;
	57	u32 val = brcmnand_readl(mmio);
	58
	59	if (en)
	60	val \|= BCM63138_CTLRDY;
	61	else
	62	val &= ~BCM63138_CTLRDY;
	63
	64	brcmnand_writel(val, mmio);
	65	}
	66
	67	static int bcm63138_nand_probe(struct platform_device *pdev)
	68	{
	69	struct device *dev = &pdev->dev;
7af67226	70	struct bcm63138_nand_soc *priv;
f628ece6 BN	71	struct brcmnand_soc *soc;
	72	struct resource *res;
	73
f628ece6 BN	74	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	75	if (!priv)
	76	return -ENOMEM;
7af67226	77	soc = &priv->soc;
f628ece6 BN	78
	79	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-int-base");
	80	priv->base = devm_ioremap_resource(dev, res);
	81	if (IS_ERR(priv->base))
	82	return PTR_ERR(priv->base);
	83
f628ece6 BN	84	soc->ctlrdy_ack = bcm63138_nand_intc_ack;
	85	soc->ctlrdy_set_enabled = bcm63138_nand_intc_set;
	86
	87	return brcmnand_probe(pdev, soc);
	88	}
	89
	90	static const struct of_device_id bcm63138_nand_of_match[] = {
	91	{ .compatible = "brcm,nand-bcm63138" },
	92	{},
	93	};
	94	MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);
	95
	96	static struct platform_driver bcm63138_nand_driver = {
	97	.probe = bcm63138_nand_probe,
	98	.remove = brcmnand_remove,
	99	.driver = {
	100	.name = "bcm63138_nand",
	101	.pm = &brcmnand_pm_ops,
	102	.of_match_table = bcm63138_nand_of_match,
	103	}
	104	};
	105	module_platform_driver(bcm63138_nand_driver);
	106
	107	MODULE_LICENSE("GPL v2");
	108	MODULE_AUTHOR("Brian Norris");
	109	MODULE_DESCRIPTION("NAND driver for BCM63138");