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/*
* Copyright 2016 Broadcom Limited
*
* 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 "spi-bcm-qspi.h"
#define INTR_BASE_BIT_SHIFT 0x02
#define INTR_COUNT 0x07
struct bcm_iproc_intc {
struct bcm_qspi_soc_intc soc_intc;
struct platform_device *pdev;
void __iomem *int_reg;
void __iomem *int_status_reg;
spinlock_t soclock;
bool big_endian;
};
static u32 bcm_iproc_qspi_get_l2_int_status(struct bcm_qspi_soc_intc *soc_intc)
{
struct bcm_iproc_intc *priv =
container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
void __iomem *mmio = priv->int_status_reg;
int i;
u32 val = 0, sts = 0;
for (i = 0; i < INTR_COUNT; i++) {
if (bcm_qspi_readl(priv->big_endian, mmio + (i * 4)))
val |= 1UL << i;
}
if (val & INTR_MSPI_DONE_MASK)
sts |= MSPI_DONE;
if (val & BSPI_LR_INTERRUPTS_ALL)
sts |= BSPI_DONE;
if (val & BSPI_LR_INTERRUPTS_ERROR)
sts |= BSPI_ERR;
return sts;
}
static void bcm_iproc_qspi_int_ack(struct bcm_qspi_soc_intc *soc_intc, int type)
{
struct bcm_iproc_intc *priv =
container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
void __iomem *mmio = priv->int_status_reg;
u32 mask = get_qspi_mask(type);
int i;
for (i = 0; i < INTR_COUNT; i++) {
if (mask & (1UL << i))
bcm_qspi_writel(priv->big_endian, 1, mmio + (i * 4));
}
}
static void bcm_iproc_qspi_int_set(struct bcm_qspi_soc_intc *soc_intc, int type,
bool en)
{
struct bcm_iproc_intc *priv =
container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
void __iomem *mmio = priv->int_reg;
u32 mask = get_qspi_mask(type);
u32 val;
unsigned long flags;
spin_lock_irqsave(&priv->soclock, flags);
val = bcm_qspi_readl(priv->big_endian, mmio);
if (en)
val = val | (mask << INTR_BASE_BIT_SHIFT);
else
val = val & ~(mask << INTR_BASE_BIT_SHIFT);
bcm_qspi_writel(priv->big_endian, val, mmio);
spin_unlock_irqrestore(&priv->soclock, flags);
}
static int bcm_iproc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct bcm_iproc_intc *priv;
struct bcm_qspi_soc_intc *soc_intc;
struct resource *res;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
soc_intc = &priv->soc_intc;
priv->pdev = pdev;
spin_lock_init(&priv->soclock);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr_regs");
priv->int_reg = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->int_reg))
return PTR_ERR(priv->int_reg);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"intr_status_reg");
priv->int_status_reg = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->int_status_reg))
return PTR_ERR(priv->int_status_reg);
priv->big_endian = of_device_is_big_endian(dev->of_node);
bcm_iproc_qspi_int_ack(soc_intc, MSPI_BSPI_DONE);
bcm_iproc_qspi_int_set(soc_intc, MSPI_BSPI_DONE, false);
soc_intc->bcm_qspi_int_ack = bcm_iproc_qspi_int_ack;
soc_intc->bcm_qspi_int_set = bcm_iproc_qspi_int_set;
soc_intc->bcm_qspi_get_int_status = bcm_iproc_qspi_get_l2_int_status;
return bcm_qspi_probe(pdev, soc_intc);
}
static int bcm_iproc_remove(struct platform_device *pdev)
{
return bcm_qspi_remove(pdev);
}
static const struct of_device_id bcm_iproc_of_match[] = {
{ .compatible = "brcm,spi-nsp-qspi" },
{ .compatible = "brcm,spi-ns2-qspi" },
{},
};
MODULE_DEVICE_TABLE(of, bcm_iproc_of_match);
static struct platform_driver bcm_iproc_driver = {
.probe = bcm_iproc_probe,
.remove = bcm_iproc_remove,
.driver = {
.name = "bcm_iproc",
.pm = &bcm_qspi_pm_ops,
.of_match_table = bcm_iproc_of_match,
}
};
module_platform_driver(bcm_iproc_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Kamal Dasu");
MODULE_DESCRIPTION("SPI flash driver for Broadcom iProc SoCs");
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