Merge tag 'Smack-for-5.11' of git://github.com/cschaufler/smack-next
[linux-2.6-microblaze.git] / drivers / dma / ti / k3-psil.c
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
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
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);