xref: /kernel/linux/linux-6.6/drivers/dma/ti/k3-psil.c (revision 62306a36) 
1// SPDX-License-Identifier: GPL-2.0
2/*
3 *  Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
4 *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
5 */
6
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/device.h>
10#include <linux/init.h>
11#include <linux/mutex.h>
12#include <linux/of.h>
13#include <linux/sys_soc.h>
14
15#include "k3-psil-priv.h"
16
17static DEFINE_MUTEX(ep_map_mutex);
18static const struct psil_ep_map *soc_ep_map;
19
20static const struct soc_device_attribute k3_soc_devices[] = {
21	{ .family = "AM65X", .data = &am654_ep_map },
22	{ .family = "J721E", .data = &j721e_ep_map },
23	{ .family = "J7200", .data = &j7200_ep_map },
24	{ .family = "AM64X", .data = &am64_ep_map },
25	{ .family = "J721S2", .data = &j721s2_ep_map },
26	{ .family = "AM62X", .data = &am62_ep_map },
27	{ .family = "AM62AX", .data = &am62a_ep_map },
28	{ .family = "J784S4", .data = &j784s4_ep_map },
29	{ /* sentinel */ }
30};
31
32struct psil_endpoint_config *psil_get_ep_config(u32 thread_id)
33{
34	int i;
35
36	mutex_lock(&ep_map_mutex);
37	if (!soc_ep_map) {
38		const struct soc_device_attribute *soc;
39
40		soc = soc_device_match(k3_soc_devices);
41		if (soc) {
42			soc_ep_map = soc->data;
43		} else {
44			pr_err("PSIL: No compatible machine found for map\n");
45			mutex_unlock(&ep_map_mutex);
46			return ERR_PTR(-ENOTSUPP);
47		}
48		pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name);
49	}
50	mutex_unlock(&ep_map_mutex);
51
52	if (thread_id & K3_PSIL_DST_THREAD_ID_OFFSET && soc_ep_map->dst) {
53		/* check in destination thread map */
54		for (i = 0; i < soc_ep_map->dst_count; i++) {
55			if (soc_ep_map->dst[i].thread_id == thread_id)
56				return &soc_ep_map->dst[i].ep_config;
57		}
58	}
59
60	thread_id &= ~K3_PSIL_DST_THREAD_ID_OFFSET;
61	if (soc_ep_map->src) {
62		for (i = 0; i < soc_ep_map->src_count; i++) {
63			if (soc_ep_map->src[i].thread_id == thread_id)
64				return &soc_ep_map->src[i].ep_config;
65		}
66	}
67
68	return ERR_PTR(-ENOENT);
69}
70EXPORT_SYMBOL_GPL(psil_get_ep_config);
71
72int psil_set_new_ep_config(struct device *dev, const char *name,
73			   struct psil_endpoint_config *ep_config)
74{
75	struct psil_endpoint_config *dst_ep_config;
76	struct of_phandle_args dma_spec;
77	u32 thread_id;
78	int index;
79
80	if (!dev || !dev->of_node)
81		return -EINVAL;
82
83	index = of_property_match_string(dev->of_node, "dma-names", name);
84	if (index < 0)
85		return index;
86
87	if (of_parse_phandle_with_args(dev->of_node, "dmas", "#dma-cells",
88				       index, &dma_spec))
89		return -ENOENT;
90
91	thread_id = dma_spec.args[0];
92
93	dst_ep_config = psil_get_ep_config(thread_id);
94	if (IS_ERR(dst_ep_config)) {
95		pr_err("PSIL: thread ID 0x%04x not defined in map\n",
96		       thread_id);
97		of_node_put(dma_spec.np);
98		return PTR_ERR(dst_ep_config);
99	}
100
101	memcpy(dst_ep_config, ep_config, sizeof(*dst_ep_config));
102
103	of_node_put(dma_spec.np);
104	return 0;
105}
106EXPORT_SYMBOL_GPL(psil_set_new_ep_config);
107MODULE_LICENSE("GPL v2");
108