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d51d0af4 MZ |
1 | /* |
2 | * Copyright (C) 2002 ARM Limited, All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | #include <linux/interrupt.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/irq.h> | |
20 | #include <linux/irqchip/arm-gic.h> | |
21 | ||
22 | #include "irq-gic-common.h" | |
23 | ||
f167b9ad AB |
24 | static DEFINE_RAW_SPINLOCK(irq_controller_lock); |
25 | ||
502d6df1 JG |
26 | static const struct gic_kvm_info *gic_kvm_info; |
27 | ||
28 | const struct gic_kvm_info *gic_get_kvm_info(void) | |
29 | { | |
30 | return gic_kvm_info; | |
31 | } | |
32 | ||
33 | void gic_set_kvm_info(const struct gic_kvm_info *info) | |
34 | { | |
35 | BUG_ON(gic_kvm_info != NULL); | |
36 | gic_kvm_info = info; | |
37 | } | |
38 | ||
67510cca RR |
39 | void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks, |
40 | void *data) | |
41 | { | |
42 | for (; quirks->desc; quirks++) { | |
43 | if (quirks->iidr != (quirks->mask & iidr)) | |
44 | continue; | |
9d111d49 AB |
45 | if (quirks->init(data)) |
46 | pr_info("GIC: enabling workaround for %s\n", | |
47 | quirks->desc); | |
67510cca RR |
48 | } |
49 | } | |
50 | ||
fb7e7deb | 51 | int gic_configure_irq(unsigned int irq, unsigned int type, |
d51d0af4 MZ |
52 | void __iomem *base, void (*sync_access)(void)) |
53 | { | |
d51d0af4 MZ |
54 | u32 confmask = 0x2 << ((irq % 16) * 2); |
55 | u32 confoff = (irq / 16) * 4; | |
fb7e7deb LD |
56 | u32 val, oldval; |
57 | int ret = 0; | |
f167b9ad | 58 | unsigned long flags; |
d51d0af4 MZ |
59 | |
60 | /* | |
61 | * Read current configuration register, and insert the config | |
62 | * for "irq", depending on "type". | |
63 | */ | |
f167b9ad | 64 | raw_spin_lock_irqsave(&irq_controller_lock, flags); |
fb7e7deb LD |
65 | val = oldval = readl_relaxed(base + GIC_DIST_CONFIG + confoff); |
66 | if (type & IRQ_TYPE_LEVEL_MASK) | |
d51d0af4 | 67 | val &= ~confmask; |
fb7e7deb | 68 | else if (type & IRQ_TYPE_EDGE_BOTH) |
d51d0af4 MZ |
69 | val |= confmask; |
70 | ||
ec1a454d | 71 | /* If the current configuration is the same, then we are done */ |
f167b9ad AB |
72 | if (val == oldval) { |
73 | raw_spin_unlock_irqrestore(&irq_controller_lock, flags); | |
ec1a454d | 74 | return 0; |
f167b9ad | 75 | } |
ec1a454d | 76 | |
d51d0af4 MZ |
77 | /* |
78 | * Write back the new configuration, and possibly re-enable | |
992345a5 JH |
79 | * the interrupt. If we fail to write a new configuration for |
80 | * an SPI then WARN and return an error. If we fail to write the | |
81 | * configuration for a PPI this is most likely because the GIC | |
82 | * does not allow us to set the configuration or we are in a | |
83 | * non-secure mode, and hence it may not be catastrophic. | |
d51d0af4 MZ |
84 | */ |
85 | writel_relaxed(val, base + GIC_DIST_CONFIG + confoff); | |
992345a5 JH |
86 | if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val) { |
87 | if (WARN_ON(irq >= 32)) | |
88 | ret = -EINVAL; | |
89 | else | |
90 | pr_warn("GIC: PPI%d is secure or misconfigured\n", | |
91 | irq - 16); | |
92 | } | |
f167b9ad | 93 | raw_spin_unlock_irqrestore(&irq_controller_lock, flags); |
d51d0af4 | 94 | |
d51d0af4 MZ |
95 | if (sync_access) |
96 | sync_access(); | |
fb7e7deb LD |
97 | |
98 | return ret; | |
d51d0af4 MZ |
99 | } |
100 | ||
cdbb813d JH |
101 | void gic_dist_config(void __iomem *base, int gic_irqs, |
102 | void (*sync_access)(void)) | |
d51d0af4 MZ |
103 | { |
104 | unsigned int i; | |
105 | ||
106 | /* | |
107 | * Set all global interrupts to be level triggered, active low. | |
108 | */ | |
109 | for (i = 32; i < gic_irqs; i += 16) | |
e5f81539 FK |
110 | writel_relaxed(GICD_INT_ACTLOW_LVLTRIG, |
111 | base + GIC_DIST_CONFIG + i / 4); | |
d51d0af4 MZ |
112 | |
113 | /* | |
114 | * Set priority on all global interrupts. | |
115 | */ | |
116 | for (i = 32; i < gic_irqs; i += 4) | |
e5f81539 | 117 | writel_relaxed(GICD_INT_DEF_PRI_X4, base + GIC_DIST_PRI + i); |
d51d0af4 MZ |
118 | |
119 | /* | |
0eece2b2 MZ |
120 | * Deactivate and disable all SPIs. Leave the PPI and SGIs |
121 | * alone as they are in the redistributor registers on GICv3. | |
d51d0af4 | 122 | */ |
0eece2b2 | 123 | for (i = 32; i < gic_irqs; i += 32) { |
e5f81539 | 124 | writel_relaxed(GICD_INT_EN_CLR_X32, |
0eece2b2 MZ |
125 | base + GIC_DIST_ACTIVE_CLEAR + i / 8); |
126 | writel_relaxed(GICD_INT_EN_CLR_X32, | |
127 | base + GIC_DIST_ENABLE_CLEAR + i / 8); | |
128 | } | |
d51d0af4 MZ |
129 | |
130 | if (sync_access) | |
131 | sync_access(); | |
132 | } | |
133 | ||
134 | void gic_cpu_config(void __iomem *base, void (*sync_access)(void)) | |
135 | { | |
136 | int i; | |
137 | ||
138 | /* | |
139 | * Deal with the banked PPI and SGI interrupts - disable all | |
140 | * PPI interrupts, ensure all SGI interrupts are enabled. | |
0eece2b2 | 141 | * Make sure everything is deactivated. |
d51d0af4 | 142 | */ |
0eece2b2 | 143 | writel_relaxed(GICD_INT_EN_CLR_X32, base + GIC_DIST_ACTIVE_CLEAR); |
e5f81539 FK |
144 | writel_relaxed(GICD_INT_EN_CLR_PPI, base + GIC_DIST_ENABLE_CLEAR); |
145 | writel_relaxed(GICD_INT_EN_SET_SGI, base + GIC_DIST_ENABLE_SET); | |
d51d0af4 MZ |
146 | |
147 | /* | |
148 | * Set priority on PPI and SGI interrupts | |
149 | */ | |
150 | for (i = 0; i < 32; i += 4) | |
e5f81539 FK |
151 | writel_relaxed(GICD_INT_DEF_PRI_X4, |
152 | base + GIC_DIST_PRI + i * 4 / 4); | |
d51d0af4 MZ |
153 | |
154 | if (sync_access) | |
155 | sync_access(); | |
156 | } |