1 // SPDX-License-Identifier: GPL-2.0
2
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4 * Copyright (C) 2018-2022 Linaro Ltd.
5 */
6
7 #include <linux/types.h>
8 #include <linux/kernel.h>
9
10 #include "ipa.h"
11 #include "ipa_data.h"
12 #include "ipa_reg.h"
13 #include "ipa_resource.h"
14
15 /**
16 * DOC: IPA Resources
17 *
18 * The IPA manages a set of resources internally for various purposes.
19 * A given IPA version has a fixed number of resource types, and a fixed
20 * total number of resources of each type. "Source" resource types
21 * are separate from "destination" resource types.
22 *
23 * Each version of IPA also has some number of resource groups. Each
24 * endpoint is assigned to a resource group, and all endpoints in the
25 * same group share pools of each type of resource. A subset of the
26 * total resources of each type is assigned for use by each group.
27 */
28
ipa_resource_limits_valid(struct ipa * ipa,const struct ipa_resource_data * data)29 static bool ipa_resource_limits_valid(struct ipa *ipa,
30 const struct ipa_resource_data *data)
31 {
32 u32 group_count;
33 u32 i;
34 u32 j;
35
36 /* We program at most 8 source or destination resource group limits */
37 BUILD_BUG_ON(IPA_RESOURCE_GROUP_MAX > 8);
38
39 group_count = data->rsrc_group_src_count;
40 if (!group_count || group_count > IPA_RESOURCE_GROUP_MAX)
41 return false;
42
43 /* Return an error if a non-zero resource limit is specified
44 * for a resource group not supported by hardware.
45 */
46 for (i = 0; i < data->resource_src_count; i++) {
47 const struct ipa_resource *resource;
48
49 resource = &data->resource_src[i];
50 for (j = group_count; j < IPA_RESOURCE_GROUP_MAX; j++)
51 if (resource->limits[j].min || resource->limits[j].max)
52 return false;
53 }
54
55 group_count = data->rsrc_group_dst_count;
56 if (!group_count || group_count > IPA_RESOURCE_GROUP_MAX)
57 return false;
58
59 for (i = 0; i < data->resource_dst_count; i++) {
60 const struct ipa_resource *resource;
61
62 resource = &data->resource_dst[i];
63 for (j = group_count; j < IPA_RESOURCE_GROUP_MAX; j++)
64 if (resource->limits[j].min || resource->limits[j].max)
65 return false;
66 }
67
68 return true;
69 }
70
71 static void
ipa_resource_config_common(struct ipa * ipa,u32 resource_type,const struct reg * reg,const struct ipa_resource_limits * xlimits,const struct ipa_resource_limits * ylimits)72 ipa_resource_config_common(struct ipa *ipa, u32 resource_type,
73 const struct reg *reg,
74 const struct ipa_resource_limits *xlimits,
75 const struct ipa_resource_limits *ylimits)
76 {
77 u32 val;
78
79 val = reg_encode(reg, X_MIN_LIM, xlimits->min);
80 val |= reg_encode(reg, X_MAX_LIM, xlimits->max);
81 if (ylimits) {
82 val |= reg_encode(reg, Y_MIN_LIM, ylimits->min);
83 val |= reg_encode(reg, Y_MAX_LIM, ylimits->max);
84 }
85
86 iowrite32(val, ipa->reg_virt + reg_n_offset(reg, resource_type));
87 }
88
ipa_resource_config_src(struct ipa * ipa,u32 resource_type,const struct ipa_resource_data * data)89 static void ipa_resource_config_src(struct ipa *ipa, u32 resource_type,
90 const struct ipa_resource_data *data)
91 {
92 u32 group_count = data->rsrc_group_src_count;
93 const struct ipa_resource_limits *ylimits;
94 const struct ipa_resource *resource;
95 const struct reg *reg;
96
97 resource = &data->resource_src[resource_type];
98
99 reg = ipa_reg(ipa, SRC_RSRC_GRP_01_RSRC_TYPE);
100 ylimits = group_count == 1 ? NULL : &resource->limits[1];
101 ipa_resource_config_common(ipa, resource_type, reg,
102 &resource->limits[0], ylimits);
103 if (group_count < 3)
104 return;
105
106 reg = ipa_reg(ipa, SRC_RSRC_GRP_23_RSRC_TYPE);
107 ylimits = group_count == 3 ? NULL : &resource->limits[3];
108 ipa_resource_config_common(ipa, resource_type, reg,
109 &resource->limits[2], ylimits);
110 if (group_count < 5)
111 return;
112
113 reg = ipa_reg(ipa, SRC_RSRC_GRP_45_RSRC_TYPE);
114 ylimits = group_count == 5 ? NULL : &resource->limits[5];
115 ipa_resource_config_common(ipa, resource_type, reg,
116 &resource->limits[4], ylimits);
117 if (group_count < 7)
118 return;
119
120 reg = ipa_reg(ipa, SRC_RSRC_GRP_67_RSRC_TYPE);
121 ylimits = group_count == 7 ? NULL : &resource->limits[7];
122 ipa_resource_config_common(ipa, resource_type, reg,
123 &resource->limits[6], ylimits);
124 }
125
ipa_resource_config_dst(struct ipa * ipa,u32 resource_type,const struct ipa_resource_data * data)126 static void ipa_resource_config_dst(struct ipa *ipa, u32 resource_type,
127 const struct ipa_resource_data *data)
128 {
129 u32 group_count = data->rsrc_group_dst_count;
130 const struct ipa_resource_limits *ylimits;
131 const struct ipa_resource *resource;
132 const struct reg *reg;
133
134 resource = &data->resource_dst[resource_type];
135
136 reg = ipa_reg(ipa, DST_RSRC_GRP_01_RSRC_TYPE);
137 ylimits = group_count == 1 ? NULL : &resource->limits[1];
138 ipa_resource_config_common(ipa, resource_type, reg,
139 &resource->limits[0], ylimits);
140 if (group_count < 3)
141 return;
142
143 reg = ipa_reg(ipa, DST_RSRC_GRP_23_RSRC_TYPE);
144 ylimits = group_count == 3 ? NULL : &resource->limits[3];
145 ipa_resource_config_common(ipa, resource_type, reg,
146 &resource->limits[2], ylimits);
147 if (group_count < 5)
148 return;
149
150 reg = ipa_reg(ipa, DST_RSRC_GRP_45_RSRC_TYPE);
151 ylimits = group_count == 5 ? NULL : &resource->limits[5];
152 ipa_resource_config_common(ipa, resource_type, reg,
153 &resource->limits[4], ylimits);
154 if (group_count < 7)
155 return;
156
157 reg = ipa_reg(ipa, DST_RSRC_GRP_67_RSRC_TYPE);
158 ylimits = group_count == 7 ? NULL : &resource->limits[7];
159 ipa_resource_config_common(ipa, resource_type, reg,
160 &resource->limits[6], ylimits);
161 }
162
163 /* Configure resources; there is no ipa_resource_deconfig() */
ipa_resource_config(struct ipa * ipa,const struct ipa_resource_data * data)164 int ipa_resource_config(struct ipa *ipa, const struct ipa_resource_data *data)
165 {
166 u32 i;
167
168 if (!ipa_resource_limits_valid(ipa, data))
169 return -EINVAL;
170
171 for (i = 0; i < data->resource_src_count; i++)
172 ipa_resource_config_src(ipa, i, data);
173
174 for (i = 0; i < data->resource_dst_count; i++)
175 ipa_resource_config_dst(ipa, i, data);
176
177 return 0;
178 }
179