Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
[sfrench/cifs-2.6.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         { .family = "J721S2", .data = &j721s2_ep_map },
25         { /* sentinel */ }
26 };
27
28 struct psil_endpoint_config *psil_get_ep_config(u32 thread_id)
29 {
30         int i;
31
32         mutex_lock(&ep_map_mutex);
33         if (!soc_ep_map) {
34                 const struct soc_device_attribute *soc;
35
36                 soc = soc_device_match(k3_soc_devices);
37                 if (soc) {
38                         soc_ep_map = soc->data;
39                 } else {
40                         pr_err("PSIL: No compatible machine found for map\n");
41                         mutex_unlock(&ep_map_mutex);
42                         return ERR_PTR(-ENOTSUPP);
43                 }
44                 pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name);
45         }
46         mutex_unlock(&ep_map_mutex);
47
48         if (thread_id & K3_PSIL_DST_THREAD_ID_OFFSET && soc_ep_map->dst) {
49                 /* check in destination thread map */
50                 for (i = 0; i < soc_ep_map->dst_count; i++) {
51                         if (soc_ep_map->dst[i].thread_id == thread_id)
52                                 return &soc_ep_map->dst[i].ep_config;
53                 }
54         }
55
56         thread_id &= ~K3_PSIL_DST_THREAD_ID_OFFSET;
57         if (soc_ep_map->src) {
58                 for (i = 0; i < soc_ep_map->src_count; i++) {
59                         if (soc_ep_map->src[i].thread_id == thread_id)
60                                 return &soc_ep_map->src[i].ep_config;
61                 }
62         }
63
64         return ERR_PTR(-ENOENT);
65 }
66 EXPORT_SYMBOL_GPL(psil_get_ep_config);
67
68 int psil_set_new_ep_config(struct device *dev, const char *name,
69                            struct psil_endpoint_config *ep_config)
70 {
71         struct psil_endpoint_config *dst_ep_config;
72         struct of_phandle_args dma_spec;
73         u32 thread_id;
74         int index;
75
76         if (!dev || !dev->of_node)
77                 return -EINVAL;
78
79         index = of_property_match_string(dev->of_node, "dma-names", name);
80         if (index < 0)
81                 return index;
82
83         if (of_parse_phandle_with_args(dev->of_node, "dmas", "#dma-cells",
84                                        index, &dma_spec))
85                 return -ENOENT;
86
87         thread_id = dma_spec.args[0];
88
89         dst_ep_config = psil_get_ep_config(thread_id);
90         if (IS_ERR(dst_ep_config)) {
91                 pr_err("PSIL: thread ID 0x%04x not defined in map\n",
92                        thread_id);
93                 of_node_put(dma_spec.np);
94                 return PTR_ERR(dst_ep_config);
95         }
96
97         memcpy(dst_ep_config, ep_config, sizeof(*dst_ep_config));
98
99         of_node_put(dma_spec.np);
100         return 0;
101 }
102 EXPORT_SYMBOL_GPL(psil_set_new_ep_config);