xref: /kernel/linux/linux-5.10/drivers/dma/ti/k3-psil.c (revision 8c2ecf20) 
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/device.h>
9#include <linux/init.h>
10#include <linux/mutex.h>
11#include <linux/of.h>
12#include <linux/sys_soc.h>
13
14#include "k3-psil-priv.h"
15
16static DEFINE_MUTEX(ep_map_mutex);
17static const struct psil_ep_map *soc_ep_map;
18
19static const struct soc_device_attribute k3_soc_devices[] = {
20	{ .family = "AM65X", .data = &am654_ep_map },
21	{ .family = "J721E", .data = &j721e_ep_map },
22	{ .family = "J7200", .data = &j7200_ep_map },
23	{ /* sentinel */ }
24};
25
26struct psil_endpoint_config *psil_get_ep_config(u32 thread_id)
27{
28	int i;
29
30	mutex_lock(&ep_map_mutex);
31	if (!soc_ep_map) {
32		const struct soc_device_attribute *soc;
33
34		soc = soc_device_match(k3_soc_devices);
35		if (soc) {
36			soc_ep_map = soc->data;
37		} else {
38			pr_err("PSIL: No compatible machine found for map\n");
39			mutex_unlock(&ep_map_mutex);
40			return ERR_PTR(-ENOTSUPP);
41		}
42		pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name);
43	}
44	mutex_unlock(&ep_map_mutex);
45
46	if (thread_id & K3_PSIL_DST_THREAD_ID_OFFSET && soc_ep_map->dst) {
47		/* check in destination thread map */
48		for (i = 0; i < soc_ep_map->dst_count; i++) {
49			if (soc_ep_map->dst[i].thread_id == thread_id)
50				return &soc_ep_map->dst[i].ep_config;
51		}
52	}
53
54	thread_id &= ~K3_PSIL_DST_THREAD_ID_OFFSET;
55	if (soc_ep_map->src) {
56		for (i = 0; i < soc_ep_map->src_count; i++) {
57			if (soc_ep_map->src[i].thread_id == thread_id)
58				return &soc_ep_map->src[i].ep_config;
59		}
60	}
61
62	return ERR_PTR(-ENOENT);
63}
64EXPORT_SYMBOL_GPL(psil_get_ep_config);
65
66int psil_set_new_ep_config(struct device *dev, const char *name,
67			   struct psil_endpoint_config *ep_config)
68{
69	struct psil_endpoint_config *dst_ep_config;
70	struct of_phandle_args dma_spec;
71	u32 thread_id;
72	int index;
73
74	if (!dev || !dev->of_node)
75		return -EINVAL;
76
77	index = of_property_match_string(dev->of_node, "dma-names", name);
78	if (index < 0)
79		return index;
80
81	if (of_parse_phandle_with_args(dev->of_node, "dmas", "#dma-cells",
82				       index, &dma_spec))
83		return -ENOENT;
84
85	thread_id = dma_spec.args[0];
86
87	dst_ep_config = psil_get_ep_config(thread_id);
88	if (IS_ERR(dst_ep_config)) {
89		pr_err("PSIL: thread ID 0x%04x not defined in map\n",
90		       thread_id);
91		of_node_put(dma_spec.np);
92		return PTR_ERR(dst_ep_config);
93	}
94
95	memcpy(dst_ep_config, ep_config, sizeof(*dst_ep_config));
96
97	of_node_put(dma_spec.np);
98	return 0;
99}
100EXPORT_SYMBOL_GPL(psil_set_new_ep_config);
101