mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 07:35:20 +07:00
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
|
/*
|
||
|
|
* 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_PB11MP_SYS_PLD_CTRL1 0x74
|
||
|
|
#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)
|
||
|
|
|
||
|
|
static int __init
|
||
|
|
realview_gic_of_init(struct device_node *node, struct device_node *parent)
|
||
|
|
{
|
||
|
|
static struct regmap *map;
|
||
|
|
|
||
|
|
/* The PB11MPCore GIC needs to be configured in the syscon */
|
||
|
|
map = syscon_regmap_lookup_by_compatible("arm,realview-pb11mp-syscon");
|
||
|
|
if (!IS_ERR(map)) {
|
||
|
|
/* new irq mode with no DCC */
|
||
|
|
regmap_write(map, REALVIEW_SYS_LOCK_OFFSET,
|
||
|
|
VERSATILE_LOCK_VAL);
|
||
|
|
regmap_update_bits(map, REALVIEW_PB11MP_SYS_PLD_CTRL1,
|
||
|
|
PLD_INTMODE_NEW_NO_DCC,
|
||
|
|
PLD_INTMODE_MASK);
|
||
|
|
regmap_write(map, REALVIEW_SYS_LOCK_OFFSET, 0x0000);
|
||
|
|
pr_info("TC11MP GIC: set up interrupt controller to NEW mode, no DCC\n");
|
||
|
|
} else {
|
||
|
|
pr_err("TC11MP GIC setup: could not find syscon\n");
|
||
|
|
return -ENXIO;
|
||
|
|
}
|
||
|
|
return gic_of_init(node, parent);
|
||
|
|
}
|
||
|
|
IRQCHIP_DECLARE(armtc11mp_gic, "arm,tc11mp-gic", realview_gic_of_init);
|