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