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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2002 ARM Limited, All Rights Reserved.
4 */
5
6#include <linux/interrupt.h>
7#include <linux/io.h>
8#include <linux/irq.h>
9#include <linux/irqchip/arm-gic.h>
10#include <linux/kernel.h>
11
12#include "irq-gic-common.h"
13
14static DEFINE_RAW_SPINLOCK(irq_controller_lock);
15
16void gic_enable_of_quirks(const struct device_node *np,
17 const struct gic_quirk *quirks, void *data)
18{
19 for (; quirks->desc; quirks++) {
20 if (!quirks->compatible && !quirks->property)
21 continue;
22 if (quirks->compatible &&
23 !of_device_is_compatible(np, quirks->compatible))
24 continue;
25 if (quirks->property &&
26 !of_property_read_bool(np, quirks->property))
27 continue;
28 if (quirks->init(data))
29 pr_info("GIC: enabling workaround for %s\n",
30 quirks->desc);
31 }
32}
33
34void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks,
35 void *data)
36{
37 for (; quirks->desc; quirks++) {
38 if (quirks->compatible || quirks->property)
39 continue;
40 if (quirks->iidr != (quirks->mask & iidr))
41 continue;
42 if (quirks->init(data))
43 pr_info("GIC: enabling workaround for %s\n",
44 quirks->desc);
45 }
46}
47
48int gic_configure_irq(unsigned int irq, unsigned int type,
49 void __iomem *base)
50{
51 u32 confmask = 0x2 << ((irq % 16) * 2);
52 u32 confoff = (irq / 16) * 4;
53 u32 val, oldval;
54 int ret = 0;
55 unsigned long flags;
56
57 /*
58 * Read current configuration register, and insert the config
59 * for "irq", depending on "type".
60 */
61 raw_spin_lock_irqsave(&irq_controller_lock, flags);
62 val = oldval = readl_relaxed(base + confoff);
63 if (type & IRQ_TYPE_LEVEL_MASK)
64 val &= ~confmask;
65 else if (type & IRQ_TYPE_EDGE_BOTH)
66 val |= confmask;
67
68 /* If the current configuration is the same, then we are done */
69 if (val == oldval) {
70 raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
71 return 0;
72 }
73
74 /*
75 * Write back the new configuration, and possibly re-enable
76 * the interrupt. If we fail to write a new configuration for
77 * an SPI then WARN and return an error. If we fail to write the
78 * configuration for a PPI this is most likely because the GIC
79 * does not allow us to set the configuration or we are in a
80 * non-secure mode, and hence it may not be catastrophic.
81 */
82 writel_relaxed(val, base + confoff);
83 if (readl_relaxed(base + confoff) != val)
84 ret = -EINVAL;
85
86 raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
87
88 return ret;
89}
90
91void gic_dist_config(void __iomem *base, int gic_irqs, u8 priority)
92{
93 unsigned int i;
94
95 /*
96 * Set all global interrupts to be level triggered, active low.
97 */
98 for (i = 32; i < gic_irqs; i += 16)
99 writel_relaxed(GICD_INT_ACTLOW_LVLTRIG,
100 base + GIC_DIST_CONFIG + i / 4);
101
102 /*
103 * Set priority on all global interrupts.
104 */
105 for (i = 32; i < gic_irqs; i += 4)
106 writel_relaxed(REPEAT_BYTE_U32(priority),
107 base + GIC_DIST_PRI + i);
108
109 /*
110 * Deactivate and disable all SPIs. Leave the PPI and SGIs
111 * alone as they are in the redistributor registers on GICv3.
112 */
113 for (i = 32; i < gic_irqs; i += 32) {
114 writel_relaxed(GICD_INT_EN_CLR_X32,
115 base + GIC_DIST_ACTIVE_CLEAR + i / 8);
116 writel_relaxed(GICD_INT_EN_CLR_X32,
117 base + GIC_DIST_ENABLE_CLEAR + i / 8);
118 }
119}
120
121void gic_cpu_config(void __iomem *base, int nr, u8 priority)
122{
123 int i;
124
125 /*
126 * Deal with the banked PPI and SGI interrupts - disable all
127 * private interrupts. Make sure everything is deactivated.
128 */
129 for (i = 0; i < nr; i += 32) {
130 writel_relaxed(GICD_INT_EN_CLR_X32,
131 base + GIC_DIST_ACTIVE_CLEAR + i / 8);
132 writel_relaxed(GICD_INT_EN_CLR_X32,
133 base + GIC_DIST_ENABLE_CLEAR + i / 8);
134 }
135
136 /*
137 * Set priority on PPI and SGI interrupts
138 */
139 for (i = 0; i < nr; i += 4)
140 writel_relaxed(REPEAT_BYTE_U32(priority),
141 base + GIC_DIST_PRI + i * 4 / 4);
142}
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
24static const struct gic_kvm_info *gic_kvm_info;
25
26const struct gic_kvm_info *gic_get_kvm_info(void)
27{
28 return gic_kvm_info;
29}
30
31void gic_set_kvm_info(const struct gic_kvm_info *info)
32{
33 BUG_ON(gic_kvm_info != NULL);
34 gic_kvm_info = info;
35}
36
37void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks,
38 void *data)
39{
40 for (; quirks->desc; quirks++) {
41 if (quirks->iidr != (quirks->mask & iidr))
42 continue;
43 quirks->init(data);
44 pr_info("GIC: enabling workaround for %s\n", quirks->desc);
45 }
46}
47
48int gic_configure_irq(unsigned int irq, unsigned int type,
49 void __iomem *base, void (*sync_access)(void))
50{
51 u32 confmask = 0x2 << ((irq % 16) * 2);
52 u32 confoff = (irq / 16) * 4;
53 u32 val, oldval;
54 int ret = 0;
55
56 /*
57 * Read current configuration register, and insert the config
58 * for "irq", depending on "type".
59 */
60 val = oldval = readl_relaxed(base + GIC_DIST_CONFIG + confoff);
61 if (type & IRQ_TYPE_LEVEL_MASK)
62 val &= ~confmask;
63 else if (type & IRQ_TYPE_EDGE_BOTH)
64 val |= confmask;
65
66 /* If the current configuration is the same, then we are done */
67 if (val == oldval)
68 return 0;
69
70 /*
71 * Write back the new configuration, and possibly re-enable
72 * the interrupt. If we fail to write a new configuration for
73 * an SPI then WARN and return an error. If we fail to write the
74 * configuration for a PPI this is most likely because the GIC
75 * does not allow us to set the configuration or we are in a
76 * non-secure mode, and hence it may not be catastrophic.
77 */
78 writel_relaxed(val, base + GIC_DIST_CONFIG + confoff);
79 if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val) {
80 if (WARN_ON(irq >= 32))
81 ret = -EINVAL;
82 else
83 pr_warn("GIC: PPI%d is secure or misconfigured\n",
84 irq - 16);
85 }
86
87 if (sync_access)
88 sync_access();
89
90 return ret;
91}
92
93void gic_dist_config(void __iomem *base, int gic_irqs,
94 void (*sync_access)(void))
95{
96 unsigned int i;
97
98 /*
99 * Set all global interrupts to be level triggered, active low.
100 */
101 for (i = 32; i < gic_irqs; i += 16)
102 writel_relaxed(GICD_INT_ACTLOW_LVLTRIG,
103 base + GIC_DIST_CONFIG + i / 4);
104
105 /*
106 * Set priority on all global interrupts.
107 */
108 for (i = 32; i < gic_irqs; i += 4)
109 writel_relaxed(GICD_INT_DEF_PRI_X4, base + GIC_DIST_PRI + i);
110
111 /*
112 * Deactivate and disable all SPIs. Leave the PPI and SGIs
113 * alone as they are in the redistributor registers on GICv3.
114 */
115 for (i = 32; i < gic_irqs; i += 32) {
116 writel_relaxed(GICD_INT_EN_CLR_X32,
117 base + GIC_DIST_ACTIVE_CLEAR + i / 8);
118 writel_relaxed(GICD_INT_EN_CLR_X32,
119 base + GIC_DIST_ENABLE_CLEAR + i / 8);
120 }
121
122 if (sync_access)
123 sync_access();
124}
125
126void gic_cpu_config(void __iomem *base, void (*sync_access)(void))
127{
128 int i;
129
130 /*
131 * Deal with the banked PPI and SGI interrupts - disable all
132 * PPI interrupts, ensure all SGI interrupts are enabled.
133 * Make sure everything is deactivated.
134 */
135 writel_relaxed(GICD_INT_EN_CLR_X32, base + GIC_DIST_ACTIVE_CLEAR);
136 writel_relaxed(GICD_INT_EN_CLR_PPI, base + GIC_DIST_ENABLE_CLEAR);
137 writel_relaxed(GICD_INT_EN_SET_SGI, base + GIC_DIST_ENABLE_SET);
138
139 /*
140 * Set priority on PPI and SGI interrupts
141 */
142 for (i = 0; i < 32; i += 4)
143 writel_relaxed(GICD_INT_DEF_PRI_X4,
144 base + GIC_DIST_PRI + i * 4 / 4);
145
146 if (sync_access)
147 sync_access();
148}