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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright © 2015 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 bcmbca_nand_soc {
struct brcmnand_soc soc;
void __iomem *base;
};
#define BCMBCA_NAND_INT_STATUS 0x00
#define BCMBCA_NAND_INT_EN 0x04
enum {
BCMBCA_CTLRDY = BIT(4),
};
#if defined(CONFIG_ARM64)
#define ALIGN_REQ 8
#else
#define ALIGN_REQ 4
#endif
static inline bool bcmbca_nand_is_buf_aligned(void *flash_cache, void *buffer)
{
return IS_ALIGNED((uintptr_t)buffer, ALIGN_REQ) &&
IS_ALIGNED((uintptr_t)flash_cache, ALIGN_REQ);
}
static bool bcmbca_nand_intc_ack(struct brcmnand_soc *soc)
{
struct bcmbca_nand_soc *priv =
container_of(soc, struct bcmbca_nand_soc, soc);
void __iomem *mmio = priv->base + BCMBCA_NAND_INT_STATUS;
u32 val = brcmnand_readl(mmio);
if (val & BCMBCA_CTLRDY) {
brcmnand_writel(val & ~BCMBCA_CTLRDY, mmio);
return true;
}
return false;
}
static void bcmbca_nand_intc_set(struct brcmnand_soc *soc, bool en)
{
struct bcmbca_nand_soc *priv =
container_of(soc, struct bcmbca_nand_soc, soc);
void __iomem *mmio = priv->base + BCMBCA_NAND_INT_EN;
u32 val = brcmnand_readl(mmio);
if (en)
val |= BCMBCA_CTLRDY;
else
val &= ~BCMBCA_CTLRDY;
brcmnand_writel(val, mmio);
}
static void bcmbca_read_data_bus(struct brcmnand_soc *soc,
void __iomem *flash_cache, u32 *buffer, int fc_words)
{
/*
* memcpy can do unaligned aligned access depending on source
* and dest address, which is incompatible with nand cache. Fallback
* to the memcpy_fromio in such case
*/
if (bcmbca_nand_is_buf_aligned((void __force *)flash_cache, buffer))
memcpy((void *)buffer, (void __force *)flash_cache, fc_words * 4);
else
memcpy_fromio((void *)buffer, flash_cache, fc_words * 4);
}
static int bcmbca_nand_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct bcmbca_nand_soc *priv;
struct brcmnand_soc *soc;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
soc = &priv->soc;
priv->base = devm_platform_ioremap_resource_byname(pdev, "nand-int-base");
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
soc->ctlrdy_ack = bcmbca_nand_intc_ack;
soc->ctlrdy_set_enabled = bcmbca_nand_intc_set;
soc->read_data_bus = bcmbca_read_data_bus;
return brcmnand_probe(pdev, soc);
}
static const struct of_device_id bcmbca_nand_of_match[] = {
{ .compatible = "brcm,nand-bcm63138" },
{},
};
MODULE_DEVICE_TABLE(of, bcmbca_nand_of_match);
static struct platform_driver bcmbca_nand_driver = {
.probe = bcmbca_nand_probe,
.remove_new = brcmnand_remove,
.driver = {
.name = "bcmbca_nand",
.pm = &brcmnand_pm_ops,
.of_match_table = bcmbca_nand_of_match,
}
};
module_platform_driver(bcmbca_nand_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Brian Norris");
MODULE_DESCRIPTION("NAND driver for BCMBCA");
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