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/*
* 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 iproc_nand_soc_priv {
void __iomem *idm_base;
void __iomem *ext_base;
spinlock_t idm_lock;
};
#define IPROC_NAND_CTLR_READY_OFFSET 0x10
#define IPROC_NAND_CTLR_READY BIT(0)
#define IPROC_NAND_IO_CTRL_OFFSET 0x00
#define IPROC_NAND_APB_LE_MODE BIT(24)
#define IPROC_NAND_INT_CTRL_READ_ENABLE BIT(6)
static bool iproc_nand_intc_ack(struct brcmnand_soc *soc)
{
struct iproc_nand_soc_priv *priv = soc->priv;
void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET;
u32 val = brcmnand_readl(mmio);
if (val & IPROC_NAND_CTLR_READY) {
brcmnand_writel(IPROC_NAND_CTLR_READY, mmio);
return true;
}
return false;
}
static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en)
{
struct iproc_nand_soc_priv *priv = soc->priv;
void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
u32 val;
unsigned long flags;
spin_lock_irqsave(&priv->idm_lock, flags);
val = brcmnand_readl(mmio);
if (en)
val |= IPROC_NAND_INT_CTRL_READ_ENABLE;
else
val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE;
brcmnand_writel(val, mmio);
spin_unlock_irqrestore(&priv->idm_lock, flags);
}
static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare)
{
struct iproc_nand_soc_priv *priv = soc->priv;
void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
u32 val;
unsigned long flags;
spin_lock_irqsave(&priv->idm_lock, flags);
val = brcmnand_readl(mmio);
if (prepare)
val |= IPROC_NAND_APB_LE_MODE;
else
val &= ~IPROC_NAND_APB_LE_MODE;
brcmnand_writel(val, mmio);
spin_unlock_irqrestore(&priv->idm_lock, flags);
}
static int iproc_nand_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct iproc_nand_soc_priv *priv;
struct brcmnand_soc *soc;
struct resource *res;
soc = devm_kzalloc(dev, sizeof(*soc), GFP_KERNEL);
if (!soc)
return -ENOMEM;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->idm_lock);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-idm");
priv->idm_base = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->idm_base))
return PTR_ERR(priv->idm_base);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-ext");
priv->ext_base = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->ext_base))
return PTR_ERR(priv->ext_base);
soc->pdev = pdev;
soc->priv = priv;
soc->ctlrdy_ack = iproc_nand_intc_ack;
soc->ctlrdy_set_enabled = iproc_nand_intc_set;
soc->prepare_data_bus = iproc_nand_apb_access;
return brcmnand_probe(pdev, soc);
}
static const struct of_device_id iproc_nand_of_match[] = {
{ .compatible = "brcm,nand-iproc" },
{},
};
MODULE_DEVICE_TABLE(of, iproc_nand_of_match);
static struct platform_driver iproc_nand_driver = {
.probe = iproc_nand_probe,
.remove = brcmnand_remove,
.driver = {
.name = "iproc_nand",
.pm = &brcmnand_pm_ops,
.of_match_table = iproc_nand_of_match,
}
};
module_platform_driver(iproc_nand_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Brian Norris");
MODULE_AUTHOR("Ray Jui");
MODULE_DESCRIPTION("NAND driver for Broadcom IPROC-based SoCs");
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