LXR linux/drivers/irqchip/irq-gic-realview.c

   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 */
  24static 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
  44static int __init
  45realview_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}
  75IRQCHIP_DECLARE(armtc11mp_gic, "arm,tc11mp-gic", realview_gic_of_init);
  76IRQCHIP_DECLARE(armeb11mp_gic, "arm,eb11mp-gic", realview_gic_of_init);
  77