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.h>
13#include <linux/of_address.h>
14#include <linux/of_irq.h>
15#include <linux/platform_device.h>
16#include <linux/soc/ti/ti_sci_inta_msi.h>
17#include <linux/soc/ti/ti_sci_protocol.h>
18
19static void ti_sci_inta_msi_write_msg(struct irq_data *data,
20 struct msi_msg *msg)
21{
22 /* Nothing to do */
23}
24
25static void ti_sci_inta_msi_compose_msi_msg(struct irq_data *data,
26 struct msi_msg *msg)
27{
28 /* Nothing to do */
29}
30
31static void ti_sci_inta_msi_update_chip_ops(struct msi_domain_info *info)
32{
33 struct irq_chip *chip = info->chip;
34
35 if (WARN_ON(!chip))
36 return;
37
38 chip->irq_request_resources = irq_chip_request_resources_parent;
39 chip->irq_release_resources = irq_chip_release_resources_parent;
40 chip->irq_compose_msi_msg = ti_sci_inta_msi_compose_msi_msg;
41 chip->irq_write_msi_msg = ti_sci_inta_msi_write_msg;
42 chip->irq_set_type = irq_chip_set_type_parent;
43 chip->irq_unmask = irq_chip_unmask_parent;
44 chip->irq_mask = irq_chip_mask_parent;
45 chip->irq_ack = irq_chip_ack_parent;
46}
47
48struct irq_domain *ti_sci_inta_msi_create_irq_domain(struct fwnode_handle *fwnode,
49 struct msi_domain_info *info,
50 struct irq_domain *parent)
51{
52 struct irq_domain *domain;
53
54 ti_sci_inta_msi_update_chip_ops(info);
55 info->flags |= MSI_FLAG_FREE_MSI_DESCS;
56
57 domain = msi_create_irq_domain(fwnode, info, parent);
58 if (domain)
59 irq_domain_update_bus_token(domain, bus_token: DOMAIN_BUS_TI_SCI_INTA_MSI);
60
61 return domain;
62}
63EXPORT_SYMBOL_GPL(ti_sci_inta_msi_create_irq_domain);
64
65static int ti_sci_inta_msi_alloc_descs(struct device *dev,
66 struct ti_sci_resource *res)
67{
68 struct msi_desc msi_desc;
69 int set, i, count = 0;
70
71 memset(&msi_desc, 0, sizeof(msi_desc));
72 msi_desc.nvec_used = 1;
73
74 for (set = 0; set < res->sets; set++) {
75 for (i = 0; i < res->desc[set].num; i++, count++) {
76 msi_desc.msi_index = res->desc[set].start + i;
77 if (msi_insert_msi_desc(dev, init_desc: &msi_desc))
78 goto fail;
79 }
80
81 for (i = 0; i < res->desc[set].num_sec; i++, count++) {
82 msi_desc.msi_index = res->desc[set].start_sec + i;
83 if (msi_insert_msi_desc(dev, init_desc: &msi_desc))
84 goto fail;
85 }
86 }
87 return count;
88fail:
89 msi_free_msi_descs(dev);
90 return -ENOMEM;
91}
92
93int ti_sci_inta_msi_domain_alloc_irqs(struct device *dev,
94 struct ti_sci_resource *res)
95{
96 struct platform_device *pdev = to_platform_device(dev);
97 int ret, nvec;
98
99 if (pdev->id < 0)
100 return -ENODEV;
101
102 ret = msi_setup_device_data(dev);
103 if (ret)
104 return ret;
105
106 msi_lock_descs(dev);
107 nvec = ti_sci_inta_msi_alloc_descs(dev, res);
108 if (nvec <= 0) {
109 ret = nvec;
110 goto unlock;
111 }
112
113 /* Use alloc ALL as it's unclear whether there are gaps in the indices */
114 ret = msi_domain_alloc_irqs_all_locked(dev, domid: MSI_DEFAULT_DOMAIN, nirqs: nvec);
115 if (ret)
116 dev_err(dev, "Failed to allocate IRQs %d\n", ret);
117unlock:
118 msi_unlock_descs(dev);
119 return ret;
120}
121EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_alloc_irqs);
122

source code of linux/drivers/soc/ti/ti_sci_inta_msi.c