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, 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, &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, &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, MSI_DEFAULT_DOMAIN, 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