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// SPDX-License-Identifier: GPL-2.0
/*
* Special GIC quirks for the ARM RealView
* Copyright (C) 2015 Linus Walleij
*/
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/bitops.h>
#include <linux/irqchip.h>
#include <linux/irqchip/arm-gic.h>
#define REALVIEW_SYS_LOCK_OFFSET 0x20
#define REALVIEW_SYS_PLD_CTRL1 0x74
#define REALVIEW_EB_REVB_SYS_PLD_CTRL1 0xD8
#define VERSATILE_LOCK_VAL 0xA05F
#define PLD_INTMODE_MASK BIT(22)|BIT(23)|BIT(24)
#define PLD_INTMODE_LEGACY 0x0
#define PLD_INTMODE_NEW_DCC BIT(22)
#define PLD_INTMODE_NEW_NO_DCC BIT(23)
#define PLD_INTMODE_FIQ_ENABLE BIT(24)
/* For some reason RealView EB Rev B moved this register */
static const struct of_device_id syscon_pldset_of_match[] = {
{
.compatible = "arm,realview-eb11mp-revb-syscon",
.data = (void *)REALVIEW_EB_REVB_SYS_PLD_CTRL1,
},
{
.compatible = "arm,realview-eb11mp-revc-syscon",
.data = (void *)REALVIEW_SYS_PLD_CTRL1,
},
{
.compatible = "arm,realview-eb-syscon",
.data = (void *)REALVIEW_SYS_PLD_CTRL1,
},
{
.compatible = "arm,realview-pb11mp-syscon",
.data = (void *)REALVIEW_SYS_PLD_CTRL1,
},
{},
};
static int __init
realview_gic_of_init(struct device_node *node, struct device_node *parent)
{
struct regmap *map;
struct device_node *np;
const struct of_device_id *gic_id;
u32 pld1_ctrl;
np = of_find_matching_node_and_match(NULL, syscon_pldset_of_match,
&gic_id);
if (!np)
return -ENODEV;
pld1_ctrl = (u32)gic_id->data;
/* The PB11MPCore GIC needs to be configured in the syscon */
map = syscon_node_to_regmap(np);
if (!IS_ERR(map)) {
/* new irq mode with no DCC */
regmap_write(map, REALVIEW_SYS_LOCK_OFFSET,
VERSATILE_LOCK_VAL);
regmap_update_bits(map, pld1_ctrl,
PLD_INTMODE_NEW_NO_DCC,
PLD_INTMODE_MASK);
regmap_write(map, REALVIEW_SYS_LOCK_OFFSET, 0x0000);
pr_info("RealView GIC: set up interrupt controller to NEW mode, no DCC\n");
} else {
pr_err("RealView GIC setup: could not find syscon\n");
return -ENODEV;
}
return gic_of_init(node, parent);
}
IRQCHIP_DECLARE(armtc11mp_gic, "arm,tc11mp-gic", realview_gic_of_init);
IRQCHIP_DECLARE(armeb11mp_gic, "arm,eb11mp-gic", realview_gic_of_init);
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