// 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);