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
16 static DEFINE_MUTEX(ep_map_mutex);
17 static const struct psil_ep_map *soc_ep_map;
18
19 static 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
psil_get_ep_config(u32 thread_id)26 struct 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 }
64 EXPORT_SYMBOL_GPL(psil_get_ep_config);
65
psil_set_new_ep_config(struct device * dev,const char * name,struct psil_endpoint_config * ep_config)66 int 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 }
100 EXPORT_SYMBOL_GPL(psil_set_new_ep_config);
101
