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

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