1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Special GIC quirks for the ARM RealView 4 * Copyright (C) 2015 Linus Walleij 5 */ 6 #include <linux/of.h> 7 #include <linux/regmap.h> 8 #include <linux/mfd/syscon.h> 9 #include <linux/bitops.h> 10 #include <linux/irqchip.h> 11 #include <linux/irqchip/arm-gic.h> 12 13 #define REALVIEW_SYS_LOCK_OFFSET 0x20 14 #define REALVIEW_SYS_PLD_CTRL1 0x74 15 #define REALVIEW_EB_REVB_SYS_PLD_CTRL1 0xD8 16 #define VERSATILE_LOCK_VAL 0xA05F 17 #define PLD_INTMODE_MASK BIT(22)|BIT(23)|BIT(24) 18 #define PLD_INTMODE_LEGACY 0x0 19 #define PLD_INTMODE_NEW_DCC BIT(22) 20 #define PLD_INTMODE_NEW_NO_DCC BIT(23) 21 #define PLD_INTMODE_FIQ_ENABLE BIT(24) 22 23 /* For some reason RealView EB Rev B moved this register */ 24 static const struct of_device_id syscon_pldset_of_match[] = { 25 { 26 .compatible = "arm,realview-eb11mp-revb-syscon", 27 .data = (void *)REALVIEW_EB_REVB_SYS_PLD_CTRL1, 28 }, 29 { 30 .compatible = "arm,realview-eb11mp-revc-syscon", 31 .data = (void *)REALVIEW_SYS_PLD_CTRL1, 32 }, 33 { 34 .compatible = "arm,realview-eb-syscon", 35 .data = (void *)REALVIEW_SYS_PLD_CTRL1, 36 }, 37 { 38 .compatible = "arm,realview-pb11mp-syscon", 39 .data = (void *)REALVIEW_SYS_PLD_CTRL1, 40 }, 41 {}, 42 }; 43 44 static int __init 45 realview_gic_of_init(struct device_node *node, struct device_node *parent) 46 { 47 struct regmap *map; 48 struct device_node *np; 49 const struct of_device_id *gic_id; 50 u32 pld1_ctrl; 51 52 np = of_find_matching_node_and_match(NULL, syscon_pldset_of_match, 53 &gic_id); 54 if (!np) 55 return -ENODEV; 56 pld1_ctrl = (u32)gic_id->data; 57 58 /* The PB11MPCore GIC needs to be configured in the syscon */ 59 map = syscon_node_to_regmap(np); 60 if (!IS_ERR(map)) { 61 /* new irq mode with no DCC */ 62 regmap_write(map, REALVIEW_SYS_LOCK_OFFSET, 63 VERSATILE_LOCK_VAL); 64 regmap_update_bits(map, pld1_ctrl, 65 PLD_INTMODE_NEW_NO_DCC, 66 PLD_INTMODE_MASK); 67 regmap_write(map, REALVIEW_SYS_LOCK_OFFSET, 0x0000); 68 pr_info("RealView GIC: set up interrupt controller to NEW mode, no DCC\n"); 69 } else { 70 pr_err("RealView GIC setup: could not find syscon\n"); 71 return -ENODEV; 72 } 73 return gic_of_init(node, parent); 74 } 75 IRQCHIP_DECLARE(armtc11mp_gic, "arm,tc11mp-gic", realview_gic_of_init); 76 IRQCHIP_DECLARE(armeb11mp_gic, "arm,eb11mp-gic", realview_gic_of_init); 77