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 { .family = "AM64X", .data = &am64_ep_map },
24 { .family = "J721S2", .data = &j721s2_ep_map },
25 { .family = "AM62X", .data = &am62_ep_map },
26 { /* sentinel */ }
27 };
28
psil_get_ep_config(u32 thread_id)29 struct psil_endpoint_config *psil_get_ep_config(u32 thread_id)
30 {
31 int i;
32
33 mutex_lock(&ep_map_mutex);
34 if (!soc_ep_map) {
35 const struct soc_device_attribute *soc;
36
37 soc = soc_device_match(k3_soc_devices);
38 if (soc) {
39 soc_ep_map = soc->data;
40 } else {
41 pr_err("PSIL: No compatible machine found for map\n");
42 mutex_unlock(&ep_map_mutex);
43 return ERR_PTR(-ENOTSUPP);
44 }
45 pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name);
46 }
47 mutex_unlock(&ep_map_mutex);
48
49 if (thread_id & K3_PSIL_DST_THREAD_ID_OFFSET && soc_ep_map->dst) {
50 /* check in destination thread map */
51 for (i = 0; i < soc_ep_map->dst_count; i++) {
52 if (soc_ep_map->dst[i].thread_id == thread_id)
53 return &soc_ep_map->dst[i].ep_config;
54 }
55 }
56
57 thread_id &= ~K3_PSIL_DST_THREAD_ID_OFFSET;
58 if (soc_ep_map->src) {
59 for (i = 0; i < soc_ep_map->src_count; i++) {
60 if (soc_ep_map->src[i].thread_id == thread_id)
61 return &soc_ep_map->src[i].ep_config;
62 }
63 }
64
65 return ERR_PTR(-ENOENT);
66 }
67 EXPORT_SYMBOL_GPL(psil_get_ep_config);
68
psil_set_new_ep_config(struct device * dev,const char * name,struct psil_endpoint_config * ep_config)69 int psil_set_new_ep_config(struct device *dev, const char *name,
70 struct psil_endpoint_config *ep_config)
71 {
72 struct psil_endpoint_config *dst_ep_config;
73 struct of_phandle_args dma_spec;
74 u32 thread_id;
75 int index;
76
77 if (!dev || !dev->of_node)
78 return -EINVAL;
79
80 index = of_property_match_string(dev->of_node, "dma-names", name);
81 if (index < 0)
82 return index;
83
84 if (of_parse_phandle_with_args(dev->of_node, "dmas", "#dma-cells",
85 index, &dma_spec))
86 return -ENOENT;
87
88 thread_id = dma_spec.args[0];
89
90 dst_ep_config = psil_get_ep_config(thread_id);
91 if (IS_ERR(dst_ep_config)) {
92 pr_err("PSIL: thread ID 0x%04x not defined in map\n",
93 thread_id);
94 of_node_put(dma_spec.np);
95 return PTR_ERR(dst_ep_config);
96 }
97
98 memcpy(dst_ep_config, ep_config, sizeof(*dst_ep_config));
99
100 of_node_put(dma_spec.np);
101 return 0;
102 }
103 EXPORT_SYMBOL_GPL(psil_set_new_ep_config);
104