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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1e6db000 MZ |
2 | /* |
3 | * Copyright (C) 2013-2015 ARM Limited, All Rights Reserved. | |
4 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
1e6db000 MZ |
5 | */ |
6 | ||
f785f7d2 | 7 | #include <linux/acpi_iort.h> |
1e6db000 MZ |
8 | #include <linux/device.h> |
9 | #include <linux/msi.h> | |
10 | #include <linux/of.h> | |
11 | #include <linux/of_irq.h> | |
12 | ||
13 | static struct irq_chip its_pmsi_irq_chip = { | |
14 | .name = "ITS-pMSI", | |
15 | }; | |
16 | ||
9ab460c2 HG |
17 | static int of_pmsi_get_dev_id(struct irq_domain *domain, struct device *dev, |
18 | u32 *dev_id) | |
1e6db000 | 19 | { |
deac7fc1 | 20 | int ret, index = 0; |
1e6db000 | 21 | |
1e6db000 | 22 | /* Suck the DeviceID out of the msi-parent property */ |
deac7fc1 MZ |
23 | do { |
24 | struct of_phandle_args args; | |
25 | ||
26 | ret = of_parse_phandle_with_args(dev->of_node, | |
27 | "msi-parent", "#msi-cells", | |
28 | index, &args); | |
29 | if (args.np == irq_domain_get_of_node(domain)) { | |
30 | if (WARN_ON(args.args_count != 1)) | |
31 | return -EINVAL; | |
9ab460c2 | 32 | *dev_id = args.args[0]; |
deac7fc1 MZ |
33 | break; |
34 | } | |
a0088737 | 35 | index++; |
deac7fc1 MZ |
36 | } while (!ret); |
37 | ||
9ab460c2 HG |
38 | return ret; |
39 | } | |
40 | ||
c2c8661f MZ |
41 | int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id) |
42 | { | |
43 | return -1; | |
44 | } | |
45 | ||
9ab460c2 HG |
46 | static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev, |
47 | int nvec, msi_alloc_info_t *info) | |
48 | { | |
49 | struct msi_domain_info *msi_info; | |
50 | u32 dev_id; | |
51 | int ret; | |
52 | ||
53 | msi_info = msi_get_domain_info(domain->parent); | |
54 | ||
c2c8661f MZ |
55 | if (dev->of_node) |
56 | ret = of_pmsi_get_dev_id(domain, dev, &dev_id); | |
57 | else | |
58 | ret = iort_pmsi_get_dev_id(dev, &dev_id); | |
1e6db000 MZ |
59 | if (ret) |
60 | return ret; | |
61 | ||
62 | /* ITS specific DeviceID, as the core ITS ignores dev. */ | |
63 | info->scratchpad[0].ul = dev_id; | |
64 | ||
147c8f37 MZ |
65 | /* Allocate at least 32 MSIs, and always as a power of 2 */ |
66 | nvec = max_t(int, 32, roundup_pow_of_two(nvec)); | |
1e6db000 MZ |
67 | return msi_info->ops->msi_prepare(domain->parent, |
68 | dev, nvec, info); | |
69 | } | |
70 | ||
71 | static struct msi_domain_ops its_pmsi_ops = { | |
72 | .msi_prepare = its_pmsi_prepare, | |
73 | }; | |
74 | ||
75 | static struct msi_domain_info its_pmsi_domain_info = { | |
76 | .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), | |
77 | .ops = &its_pmsi_ops, | |
78 | .chip = &its_pmsi_irq_chip, | |
79 | }; | |
80 | ||
5b867061 | 81 | static const struct of_device_id its_device_id[] = { |
1e6db000 MZ |
82 | { .compatible = "arm,gic-v3-its", }, |
83 | {}, | |
84 | }; | |
85 | ||
42677db9 HG |
86 | static int __init its_pmsi_init_one(struct fwnode_handle *fwnode, |
87 | const char *name) | |
1e6db000 | 88 | { |
1e6db000 MZ |
89 | struct irq_domain *parent; |
90 | ||
42677db9 HG |
91 | parent = irq_find_matching_fwnode(fwnode, DOMAIN_BUS_NEXUS); |
92 | if (!parent || !msi_get_domain_info(parent)) { | |
93 | pr_err("%s: unable to locate ITS domain\n", name); | |
94 | return -ENXIO; | |
95 | } | |
96 | ||
97 | if (!platform_msi_create_irq_domain(fwnode, &its_pmsi_domain_info, | |
98 | parent)) { | |
99 | pr_err("%s: unable to create platform domain\n", name); | |
100 | return -ENXIO; | |
101 | } | |
102 | ||
103 | pr_info("Platform MSI: %s domain created\n", name); | |
104 | return 0; | |
105 | } | |
106 | ||
f785f7d2 HG |
107 | #ifdef CONFIG_ACPI |
108 | static int __init | |
60574d1e | 109 | its_pmsi_parse_madt(union acpi_subtable_headers *header, |
f785f7d2 HG |
110 | const unsigned long end) |
111 | { | |
112 | struct acpi_madt_generic_translator *its_entry; | |
113 | struct fwnode_handle *domain_handle; | |
114 | const char *node_name; | |
115 | int err = -ENXIO; | |
116 | ||
117 | its_entry = (struct acpi_madt_generic_translator *)header; | |
118 | node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx", | |
119 | (long)its_entry->base_address); | |
120 | domain_handle = iort_find_domain_token(its_entry->translation_id); | |
121 | if (!domain_handle) { | |
122 | pr_err("%s: Unable to locate ITS domain handle\n", node_name); | |
123 | goto out; | |
124 | } | |
125 | ||
126 | err = its_pmsi_init_one(domain_handle, node_name); | |
127 | ||
128 | out: | |
129 | kfree(node_name); | |
130 | return err; | |
131 | } | |
132 | ||
133 | static void __init its_pmsi_acpi_init(void) | |
134 | { | |
135 | acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR, | |
136 | its_pmsi_parse_madt, 0); | |
137 | } | |
138 | #else | |
139 | static inline void its_pmsi_acpi_init(void) { } | |
140 | #endif | |
141 | ||
42677db9 HG |
142 | static void __init its_pmsi_of_init(void) |
143 | { | |
144 | struct device_node *np; | |
145 | ||
1e6db000 MZ |
146 | for (np = of_find_matching_node(NULL, its_device_id); np; |
147 | np = of_find_matching_node(np, its_device_id)) { | |
95a25625 SB |
148 | if (!of_device_is_available(np)) |
149 | continue; | |
1e6db000 MZ |
150 | if (!of_property_read_bool(np, "msi-controller")) |
151 | continue; | |
152 | ||
42677db9 | 153 | its_pmsi_init_one(of_node_to_fwnode(np), np->full_name); |
1e6db000 | 154 | } |
42677db9 | 155 | } |
1e6db000 | 156 | |
42677db9 HG |
157 | static int __init its_pmsi_init(void) |
158 | { | |
159 | its_pmsi_of_init(); | |
f785f7d2 | 160 | its_pmsi_acpi_init(); |
1e6db000 MZ |
161 | return 0; |
162 | } | |
163 | early_initcall(its_pmsi_init); |