1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Texas Instruments' K3 Interrupt Aggregator MSI bus
4 *
5 * Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/
6 * Lokesh Vutla <lokeshvutla@ti.com>
7 */
8
9 #include <linux/irq.h>
10 #include <linux/irqdomain.h>
11 #include <linux/msi.h>
12 #include <linux/of_address.h>
13 #include <linux/of_device.h>
14 #include <linux/of_irq.h>
15 #include <linux/soc/ti/ti_sci_inta_msi.h>
16 #include <linux/soc/ti/ti_sci_protocol.h>
17
ti_sci_inta_msi_write_msg(struct irq_data * data,struct msi_msg * msg)18 static void ti_sci_inta_msi_write_msg(struct irq_data *data,
19 struct msi_msg *msg)
20 {
21 /* Nothing to do */
22 }
23
ti_sci_inta_msi_compose_msi_msg(struct irq_data * data,struct msi_msg * msg)24 static void ti_sci_inta_msi_compose_msi_msg(struct irq_data *data,
25 struct msi_msg *msg)
26 {
27 /* Nothing to do */
28 }
29
ti_sci_inta_msi_update_chip_ops(struct msi_domain_info * info)30 static void ti_sci_inta_msi_update_chip_ops(struct msi_domain_info *info)
31 {
32 struct irq_chip *chip = info->chip;
33
34 if (WARN_ON(!chip))
35 return;
36
37 chip->irq_request_resources = irq_chip_request_resources_parent;
38 chip->irq_release_resources = irq_chip_release_resources_parent;
39 chip->irq_compose_msi_msg = ti_sci_inta_msi_compose_msi_msg;
40 chip->irq_write_msi_msg = ti_sci_inta_msi_write_msg;
41 chip->irq_set_type = irq_chip_set_type_parent;
42 chip->irq_unmask = irq_chip_unmask_parent;
43 chip->irq_mask = irq_chip_mask_parent;
44 chip->irq_ack = irq_chip_ack_parent;
45 }
46
ti_sci_inta_msi_create_irq_domain(struct fwnode_handle * fwnode,struct msi_domain_info * info,struct irq_domain * parent)47 struct irq_domain *ti_sci_inta_msi_create_irq_domain(struct fwnode_handle *fwnode,
48 struct msi_domain_info *info,
49 struct irq_domain *parent)
50 {
51 struct irq_domain *domain;
52
53 ti_sci_inta_msi_update_chip_ops(info);
54
55 domain = msi_create_irq_domain(fwnode, info, parent);
56 if (domain)
57 irq_domain_update_bus_token(domain, DOMAIN_BUS_TI_SCI_INTA_MSI);
58
59 return domain;
60 }
61 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_create_irq_domain);
62
ti_sci_inta_msi_free_descs(struct device * dev)63 static void ti_sci_inta_msi_free_descs(struct device *dev)
64 {
65 struct msi_desc *desc, *tmp;
66
67 list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
68 list_del(&desc->list);
69 free_msi_entry(desc);
70 }
71 }
72
ti_sci_inta_msi_alloc_descs(struct device * dev,struct ti_sci_resource * res)73 static int ti_sci_inta_msi_alloc_descs(struct device *dev,
74 struct ti_sci_resource *res)
75 {
76 struct msi_desc *msi_desc;
77 int set, i, count = 0;
78
79 for (set = 0; set < res->sets; set++) {
80 for (i = 0; i < res->desc[set].num; i++) {
81 msi_desc = alloc_msi_entry(dev, 1, NULL);
82 if (!msi_desc) {
83 ti_sci_inta_msi_free_descs(dev);
84 return -ENOMEM;
85 }
86
87 msi_desc->inta.dev_index = res->desc[set].start + i;
88 INIT_LIST_HEAD(&msi_desc->list);
89 list_add_tail(&msi_desc->list, dev_to_msi_list(dev));
90 count++;
91 }
92 }
93
94 return count;
95 }
96
ti_sci_inta_msi_domain_alloc_irqs(struct device * dev,struct ti_sci_resource * res)97 int ti_sci_inta_msi_domain_alloc_irqs(struct device *dev,
98 struct ti_sci_resource *res)
99 {
100 struct platform_device *pdev = to_platform_device(dev);
101 struct irq_domain *msi_domain;
102 int ret, nvec;
103
104 msi_domain = dev_get_msi_domain(dev);
105 if (!msi_domain)
106 return -EINVAL;
107
108 if (pdev->id < 0)
109 return -ENODEV;
110
111 nvec = ti_sci_inta_msi_alloc_descs(dev, res);
112 if (nvec <= 0)
113 return nvec;
114
115 ret = msi_domain_alloc_irqs(msi_domain, dev, nvec);
116 if (ret) {
117 dev_err(dev, "Failed to allocate IRQs %d\n", ret);
118 goto cleanup;
119 }
120
121 return 0;
122
123 cleanup:
124 ti_sci_inta_msi_free_descs(&pdev->dev);
125 return ret;
126 }
127 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_alloc_irqs);
128
ti_sci_inta_msi_domain_free_irqs(struct device * dev)129 void ti_sci_inta_msi_domain_free_irqs(struct device *dev)
130 {
131 msi_domain_free_irqs(dev->msi_domain, dev);
132 ti_sci_inta_msi_free_descs(dev);
133 }
134 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_free_irqs);
135
ti_sci_inta_msi_get_virq(struct device * dev,u32 dev_index)136 unsigned int ti_sci_inta_msi_get_virq(struct device *dev, u32 dev_index)
137 {
138 struct msi_desc *desc;
139
140 for_each_msi_entry(desc, dev)
141 if (desc->inta.dev_index == dev_index)
142 return desc->irq;
143
144 return -ENODEV;
145 }
146 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_get_virq);
147
