xref: /openbmc/linux/drivers/dma/ti/k3-psil.c (revision 82e6051a)
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/module.h>
9 #include <linux/device.h>
10 #include <linux/init.h>
11 #include <linux/mutex.h>
12 #include <linux/of.h>
13 #include <linux/sys_soc.h>
14 
15 #include "k3-psil-priv.h"
16 
17 static DEFINE_MUTEX(ep_map_mutex);
18 static const struct psil_ep_map *soc_ep_map;
19 
20 static const struct soc_device_attribute k3_soc_devices[] = {
21 	{ .family = "AM65X", .data = &am654_ep_map },
22 	{ .family = "J721E", .data = &j721e_ep_map },
23 	{ .family = "J7200", .data = &j7200_ep_map },
24 	{ .family = "AM64X", .data = &am64_ep_map },
25 	{ .family = "J721S2", .data = &j721s2_ep_map },
26 	{ .family = "AM62X", .data = &am62_ep_map },
27 	{ .family = "AM62AX", .data = &am62a_ep_map },
28 	{ .family = "J784S4", .data = &j784s4_ep_map },
29 	{ /* sentinel */ }
30 };
31 
psil_get_ep_config(u32 thread_id)32 struct psil_endpoint_config *psil_get_ep_config(u32 thread_id)
33 {
34 	int i;
35 
36 	mutex_lock(&ep_map_mutex);
37 	if (!soc_ep_map) {
38 		const struct soc_device_attribute *soc;
39 
40 		soc = soc_device_match(k3_soc_devices);
41 		if (soc) {
42 			soc_ep_map = soc->data;
43 		} else {
44 			pr_err("PSIL: No compatible machine found for map\n");
45 			mutex_unlock(&ep_map_mutex);
46 			return ERR_PTR(-ENOTSUPP);
47 		}
48 		pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name);
49 	}
50 	mutex_unlock(&ep_map_mutex);
51 
52 	if (thread_id & K3_PSIL_DST_THREAD_ID_OFFSET && soc_ep_map->dst) {
53 		/* check in destination thread map */
54 		for (i = 0; i < soc_ep_map->dst_count; i++) {
55 			if (soc_ep_map->dst[i].thread_id == thread_id)
56 				return &soc_ep_map->dst[i].ep_config;
57 		}
58 	}
59 
60 	thread_id &= ~K3_PSIL_DST_THREAD_ID_OFFSET;
61 	if (soc_ep_map->src) {
62 		for (i = 0; i < soc_ep_map->src_count; i++) {
63 			if (soc_ep_map->src[i].thread_id == thread_id)
64 				return &soc_ep_map->src[i].ep_config;
65 		}
66 	}
67 
68 	return ERR_PTR(-ENOENT);
69 }
70 EXPORT_SYMBOL_GPL(psil_get_ep_config);
71 
psil_set_new_ep_config(struct device * dev,const char * name,struct psil_endpoint_config * ep_config)72 int psil_set_new_ep_config(struct device *dev, const char *name,
73 			   struct psil_endpoint_config *ep_config)
74 {
75 	struct psil_endpoint_config *dst_ep_config;
76 	struct of_phandle_args dma_spec;
77 	u32 thread_id;
78 	int index;
79 
80 	if (!dev || !dev->of_node)
81 		return -EINVAL;
82 
83 	index = of_property_match_string(dev->of_node, "dma-names", name);
84 	if (index < 0)
85 		return index;
86 
87 	if (of_parse_phandle_with_args(dev->of_node, "dmas", "#dma-cells",
88 				       index, &dma_spec))
89 		return -ENOENT;
90 
91 	thread_id = dma_spec.args[0];
92 
93 	dst_ep_config = psil_get_ep_config(thread_id);
94 	if (IS_ERR(dst_ep_config)) {
95 		pr_err("PSIL: thread ID 0x%04x not defined in map\n",
96 		       thread_id);
97 		of_node_put(dma_spec.np);
98 		return PTR_ERR(dst_ep_config);
99 	}
100 
101 	memcpy(dst_ep_config, ep_config, sizeof(*dst_ep_config));
102 
103 	of_node_put(dma_spec.np);
104 	return 0;
105 }
106 EXPORT_SYMBOL_GPL(psil_set_new_ep_config);
107 MODULE_LICENSE("GPL v2");
108