2 * Copyright (C) 2011 Google, Inc.
5 * Colin Cross <ccross@android.com>
7 * Copyright (C) 2010, NVIDIA Corporation
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
20 #include <linux/kernel.h>
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
26 #include <asm/hardware/gic.h>
31 #define ICTLR_CPU_IEP_VFIQ 0x08
32 #define ICTLR_CPU_IEP_FIR 0x14
33 #define ICTLR_CPU_IEP_FIR_SET 0x18
34 #define ICTLR_CPU_IEP_FIR_CLR 0x1c
36 #define ICTLR_CPU_IER 0x20
37 #define ICTLR_CPU_IER_SET 0x24
38 #define ICTLR_CPU_IER_CLR 0x28
39 #define ICTLR_CPU_IEP_CLASS 0x2C
41 #define ICTLR_COP_IER 0x30
42 #define ICTLR_COP_IER_SET 0x34
43 #define ICTLR_COP_IER_CLR 0x38
44 #define ICTLR_COP_IEP_CLASS 0x3c
46 #define FIRST_LEGACY_IRQ 32
48 static int num_ictlrs;
50 static void __iomem *ictlr_reg_base[] = {
51 IO_ADDRESS(TEGRA_PRIMARY_ICTLR_BASE),
52 IO_ADDRESS(TEGRA_SECONDARY_ICTLR_BASE),
53 IO_ADDRESS(TEGRA_TERTIARY_ICTLR_BASE),
54 IO_ADDRESS(TEGRA_QUATERNARY_ICTLR_BASE),
55 IO_ADDRESS(TEGRA_QUINARY_ICTLR_BASE),
58 static inline void tegra_irq_write_mask(unsigned int irq, unsigned long reg)
63 BUG_ON(irq < FIRST_LEGACY_IRQ ||
64 irq >= FIRST_LEGACY_IRQ + num_ictlrs * 32);
66 base = ictlr_reg_base[(irq - FIRST_LEGACY_IRQ) / 32];
67 mask = BIT((irq - FIRST_LEGACY_IRQ) % 32);
69 __raw_writel(mask, base + reg);
72 static void tegra_mask(struct irq_data *d)
74 if (d->irq < FIRST_LEGACY_IRQ)
77 tegra_irq_write_mask(d->irq, ICTLR_CPU_IER_CLR);
80 static void tegra_unmask(struct irq_data *d)
82 if (d->irq < FIRST_LEGACY_IRQ)
85 tegra_irq_write_mask(d->irq, ICTLR_CPU_IER_SET);
88 static void tegra_ack(struct irq_data *d)
90 if (d->irq < FIRST_LEGACY_IRQ)
93 tegra_irq_write_mask(d->irq, ICTLR_CPU_IEP_FIR_CLR);
96 static void tegra_eoi(struct irq_data *d)
98 if (d->irq < FIRST_LEGACY_IRQ)
101 tegra_irq_write_mask(d->irq, ICTLR_CPU_IEP_FIR_CLR);
104 static int tegra_retrigger(struct irq_data *d)
106 if (d->irq < FIRST_LEGACY_IRQ)
109 tegra_irq_write_mask(d->irq, ICTLR_CPU_IEP_FIR_SET);
114 void __init tegra_init_irq(void)
117 void __iomem *distbase;
119 distbase = IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE);
120 num_ictlrs = readl_relaxed(distbase + GIC_DIST_CTR) & 0x1f;
122 if (num_ictlrs > ARRAY_SIZE(ictlr_reg_base)) {
123 WARN(1, "Too many (%d) interrupt controllers found. Maximum is %d.",
124 num_ictlrs, ARRAY_SIZE(ictlr_reg_base));
125 num_ictlrs = ARRAY_SIZE(ictlr_reg_base);
128 for (i = 0; i < num_ictlrs; i++) {
129 void __iomem *ictlr = ictlr_reg_base[i];
130 writel(~0, ictlr + ICTLR_CPU_IER_CLR);
131 writel(0, ictlr + ICTLR_CPU_IEP_CLASS);
134 gic_arch_extn.irq_ack = tegra_ack;
135 gic_arch_extn.irq_eoi = tegra_eoi;
136 gic_arch_extn.irq_mask = tegra_mask;
137 gic_arch_extn.irq_unmask = tegra_unmask;
138 gic_arch_extn.irq_retrigger = tegra_retrigger;
141 * Check if there is a devicetree present, since the GIC will be
142 * initialized elsewhere under DT.
144 if (!of_have_populated_dt())
145 gic_init(0, 29, distbase,
146 IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x100));