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