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/*
* Copyright 2015 Simon Arlott
*
* 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.
*
* Derived from bcm63138_nand.c:
* Copyright © 2015 Broadcom Corporation
*
* Derived from bcm963xx_4.12L.06B_consumer/shared/opensource/include/bcm963xx/63268_map_part.h:
* Copyright 2000-2010 Broadcom Corporation
*
* Derived from bcm963xx_4.12L.06B_consumer/shared/opensource/flash/nandflash.c:
* Copyright 2000-2010 Broadcom Corporation
*/
#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 bcm6368_nand_soc {
struct brcmnand_soc soc;
void __iomem *base;
};
#define BCM6368_NAND_INT 0x00
#define BCM6368_NAND_STATUS_SHIFT 0
#define BCM6368_NAND_STATUS_MASK (0xfff << BCM6368_NAND_STATUS_SHIFT)
#define BCM6368_NAND_ENABLE_SHIFT 16
#define BCM6368_NAND_ENABLE_MASK (0xffff << BCM6368_NAND_ENABLE_SHIFT)
#define BCM6368_NAND_BASE_ADDR0 0x04
#define BCM6368_NAND_BASE_ADDR1 0x0c
enum {
BCM6368_NP_READ = BIT(0),
BCM6368_BLOCK_ERASE = BIT(1),
BCM6368_COPY_BACK = BIT(2),
BCM6368_PAGE_PGM = BIT(3),
BCM6368_CTRL_READY = BIT(4),
BCM6368_DEV_RBPIN = BIT(5),
BCM6368_ECC_ERR_UNC = BIT(6),
BCM6368_ECC_ERR_CORR = BIT(7),
};
static bool bcm6368_nand_intc_ack(struct brcmnand_soc *soc)
{
struct bcm6368_nand_soc *priv =
container_of(soc, struct bcm6368_nand_soc, soc);
void __iomem *mmio = priv->base + BCM6368_NAND_INT;
u32 val = brcmnand_readl(mmio);
if (val & (BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT)) {
/* Ack interrupt */
val &= ~BCM6368_NAND_STATUS_MASK;
val |= BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT;
brcmnand_writel(val, mmio);
return true;
}
return false;
}
static void bcm6368_nand_intc_set(struct brcmnand_soc *soc, bool en)
{
struct bcm6368_nand_soc *priv =
container_of(soc, struct bcm6368_nand_soc, soc);
void __iomem *mmio = priv->base + BCM6368_NAND_INT;
u32 val = brcmnand_readl(mmio);
/* Don't ack any interrupts */
val &= ~BCM6368_NAND_STATUS_MASK;
if (en)
val |= BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT;
else
val &= ~(BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT);
brcmnand_writel(val, mmio);
}
static int bcm6368_nand_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct bcm6368_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 = bcm6368_nand_intc_ack;
soc->ctlrdy_set_enabled = bcm6368_nand_intc_set;
/* Disable and ack all interrupts */
brcmnand_writel(0, priv->base + BCM6368_NAND_INT);
brcmnand_writel(BCM6368_NAND_STATUS_MASK,
priv->base + BCM6368_NAND_INT);
return brcmnand_probe(pdev, soc);
}
static const struct of_device_id bcm6368_nand_of_match[] = {
{ .compatible = "brcm,nand-bcm6368" },
{},
};
MODULE_DEVICE_TABLE(of, bcm6368_nand_of_match);
static struct platform_driver bcm6368_nand_driver = {
.probe = bcm6368_nand_probe,
.remove = brcmnand_remove,
.driver = {
.name = "bcm6368_nand",
.pm = &brcmnand_pm_ops,
.of_match_table = bcm6368_nand_of_match,
}
};
module_platform_driver(bcm6368_nand_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Simon Arlott");
MODULE_DESCRIPTION("NAND driver for BCM6368");
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