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1e6db000 MZ |
1 | /* |
2 | * Copyright (C) 2013-2015 ARM Limited, All Rights Reserved. | |
3 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
f785f7d2 | 18 | #include <linux/acpi_iort.h> |
1e6db000 MZ |
19 | #include <linux/device.h> |
20 | #include <linux/msi.h> | |
21 | #include <linux/of.h> | |
22 | #include <linux/of_irq.h> | |
23 | ||
24 | static struct irq_chip its_pmsi_irq_chip = { | |
25 | .name = "ITS-pMSI", | |
26 | }; | |
27 | ||
9ab460c2 HG |
28 | static int of_pmsi_get_dev_id(struct irq_domain *domain, struct device *dev, |
29 | u32 *dev_id) | |
1e6db000 | 30 | { |
deac7fc1 | 31 | int ret, index = 0; |
1e6db000 | 32 | |
1e6db000 | 33 | /* Suck the DeviceID out of the msi-parent property */ |
deac7fc1 MZ |
34 | do { |
35 | struct of_phandle_args args; | |
36 | ||
37 | ret = of_parse_phandle_with_args(dev->of_node, | |
38 | "msi-parent", "#msi-cells", | |
39 | index, &args); | |
40 | if (args.np == irq_domain_get_of_node(domain)) { | |
41 | if (WARN_ON(args.args_count != 1)) | |
42 | return -EINVAL; | |
9ab460c2 | 43 | *dev_id = args.args[0]; |
deac7fc1 MZ |
44 | break; |
45 | } | |
a0088737 | 46 | index++; |
deac7fc1 MZ |
47 | } while (!ret); |
48 | ||
9ab460c2 HG |
49 | return ret; |
50 | } | |
51 | ||
c2c8661f MZ |
52 | int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id) |
53 | { | |
54 | return -1; | |
55 | } | |
56 | ||
9ab460c2 HG |
57 | static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev, |
58 | int nvec, msi_alloc_info_t *info) | |
59 | { | |
60 | struct msi_domain_info *msi_info; | |
61 | u32 dev_id; | |
62 | int ret; | |
63 | ||
64 | msi_info = msi_get_domain_info(domain->parent); | |
65 | ||
c2c8661f MZ |
66 | if (dev->of_node) |
67 | ret = of_pmsi_get_dev_id(domain, dev, &dev_id); | |
68 | else | |
69 | ret = iort_pmsi_get_dev_id(dev, &dev_id); | |
1e6db000 MZ |
70 | if (ret) |
71 | return ret; | |
72 | ||
73 | /* ITS specific DeviceID, as the core ITS ignores dev. */ | |
74 | info->scratchpad[0].ul = dev_id; | |
75 | ||
147c8f37 MZ |
76 | /* Allocate at least 32 MSIs, and always as a power of 2 */ |
77 | nvec = max_t(int, 32, roundup_pow_of_two(nvec)); | |
1e6db000 MZ |
78 | return msi_info->ops->msi_prepare(domain->parent, |
79 | dev, nvec, info); | |
80 | } | |
81 | ||
82 | static struct msi_domain_ops its_pmsi_ops = { | |
83 | .msi_prepare = its_pmsi_prepare, | |
84 | }; | |
85 | ||
86 | static struct msi_domain_info its_pmsi_domain_info = { | |
87 | .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), | |
88 | .ops = &its_pmsi_ops, | |
89 | .chip = &its_pmsi_irq_chip, | |
90 | }; | |
91 | ||
5b867061 | 92 | static const struct of_device_id its_device_id[] = { |
1e6db000 MZ |
93 | { .compatible = "arm,gic-v3-its", }, |
94 | {}, | |
95 | }; | |
96 | ||
42677db9 HG |
97 | static int __init its_pmsi_init_one(struct fwnode_handle *fwnode, |
98 | const char *name) | |
1e6db000 | 99 | { |
1e6db000 MZ |
100 | struct irq_domain *parent; |
101 | ||
42677db9 HG |
102 | parent = irq_find_matching_fwnode(fwnode, DOMAIN_BUS_NEXUS); |
103 | if (!parent || !msi_get_domain_info(parent)) { | |
104 | pr_err("%s: unable to locate ITS domain\n", name); | |
105 | return -ENXIO; | |
106 | } | |
107 | ||
108 | if (!platform_msi_create_irq_domain(fwnode, &its_pmsi_domain_info, | |
109 | parent)) { | |
110 | pr_err("%s: unable to create platform domain\n", name); | |
111 | return -ENXIO; | |
112 | } | |
113 | ||
114 | pr_info("Platform MSI: %s domain created\n", name); | |
115 | return 0; | |
116 | } | |
117 | ||
f785f7d2 HG |
118 | #ifdef CONFIG_ACPI |
119 | static int __init | |
120 | its_pmsi_parse_madt(struct acpi_subtable_header *header, | |
121 | const unsigned long end) | |
122 | { | |
123 | struct acpi_madt_generic_translator *its_entry; | |
124 | struct fwnode_handle *domain_handle; | |
125 | const char *node_name; | |
126 | int err = -ENXIO; | |
127 | ||
128 | its_entry = (struct acpi_madt_generic_translator *)header; | |
129 | node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx", | |
130 | (long)its_entry->base_address); | |
131 | domain_handle = iort_find_domain_token(its_entry->translation_id); | |
132 | if (!domain_handle) { | |
133 | pr_err("%s: Unable to locate ITS domain handle\n", node_name); | |
134 | goto out; | |
135 | } | |
136 | ||
137 | err = its_pmsi_init_one(domain_handle, node_name); | |
138 | ||
139 | out: | |
140 | kfree(node_name); | |
141 | return err; | |
142 | } | |
143 | ||
144 | static void __init its_pmsi_acpi_init(void) | |
145 | { | |
146 | acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR, | |
147 | its_pmsi_parse_madt, 0); | |
148 | } | |
149 | #else | |
150 | static inline void its_pmsi_acpi_init(void) { } | |
151 | #endif | |
152 | ||
42677db9 HG |
153 | static void __init its_pmsi_of_init(void) |
154 | { | |
155 | struct device_node *np; | |
156 | ||
1e6db000 MZ |
157 | for (np = of_find_matching_node(NULL, its_device_id); np; |
158 | np = of_find_matching_node(np, its_device_id)) { | |
95a25625 SB |
159 | if (!of_device_is_available(np)) |
160 | continue; | |
1e6db000 MZ |
161 | if (!of_property_read_bool(np, "msi-controller")) |
162 | continue; | |
163 | ||
42677db9 | 164 | its_pmsi_init_one(of_node_to_fwnode(np), np->full_name); |
1e6db000 | 165 | } |
42677db9 | 166 | } |
1e6db000 | 167 | |
42677db9 HG |
168 | static int __init its_pmsi_init(void) |
169 | { | |
170 | its_pmsi_of_init(); | |
f785f7d2 | 171 | its_pmsi_acpi_init(); |
1e6db000 MZ |
172 | return 0; |
173 | } | |
174 | early_initcall(its_pmsi_init); |