1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4 * Copyright (C) 2018-2021 Linaro Ltd.
7 #include <linux/types.h>
8 #include <linux/kernel.h>
13 #include "ipa_resource.h"
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.
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.
29 static bool ipa_resource_limits_valid(struct ipa *ipa,
30 const struct ipa_resource_data *data)
37 /* We program at most 8 source or destination resource group limits */
38 BUILD_BUG_ON(IPA_RESOURCE_GROUP_MAX > 8);
40 group_count = data->rsrc_group_src_count;
41 if (!group_count || group_count > IPA_RESOURCE_GROUP_MAX)
44 /* Return an error if a non-zero resource limit is specified
45 * for a resource group not supported by hardware.
47 for (i = 0; i < data->resource_src_count; i++) {
48 const struct ipa_resource *resource;
50 resource = &data->resource_src[i];
51 for (j = group_count; j < IPA_RESOURCE_GROUP_MAX; j++)
52 if (resource->limits[j].min || resource->limits[j].max)
56 group_count = data->rsrc_group_src_count;
57 if (!group_count || group_count > IPA_RESOURCE_GROUP_MAX)
60 for (i = 0; i < data->resource_dst_count; i++) {
61 const struct ipa_resource *resource;
63 resource = &data->resource_dst[i];
64 for (j = group_count; j < IPA_RESOURCE_GROUP_MAX; j++)
65 if (resource->limits[j].min || resource->limits[j].max)
68 #endif /* !IPA_VALIDATION */
73 ipa_resource_config_common(struct ipa *ipa, u32 offset,
74 const struct ipa_resource_limits *xlimits,
75 const struct ipa_resource_limits *ylimits)
79 val = u32_encode_bits(xlimits->min, X_MIN_LIM_FMASK);
80 val |= u32_encode_bits(xlimits->max, X_MAX_LIM_FMASK);
82 val |= u32_encode_bits(ylimits->min, Y_MIN_LIM_FMASK);
83 val |= u32_encode_bits(ylimits->max, Y_MAX_LIM_FMASK);
86 iowrite32(val, ipa->reg_virt + offset);
89 static void ipa_resource_config_src(struct ipa *ipa, u32 resource_type,
90 const struct ipa_resource_data *data)
92 u32 group_count = data->rsrc_group_src_count;
93 const struct ipa_resource_limits *ylimits;
94 const struct ipa_resource *resource;
97 resource = &data->resource_src[resource_type];
99 offset = IPA_REG_SRC_RSRC_GRP_01_RSRC_TYPE_N_OFFSET(resource_type);
100 ylimits = group_count == 1 ? NULL : &resource->limits[1];
101 ipa_resource_config_common(ipa, offset, &resource->limits[0], ylimits);
106 offset = IPA_REG_SRC_RSRC_GRP_23_RSRC_TYPE_N_OFFSET(resource_type);
107 ylimits = group_count == 3 ? NULL : &resource->limits[3];
108 ipa_resource_config_common(ipa, offset, &resource->limits[2], ylimits);
113 offset = IPA_REG_SRC_RSRC_GRP_45_RSRC_TYPE_N_OFFSET(resource_type);
114 ylimits = group_count == 5 ? NULL : &resource->limits[5];
115 ipa_resource_config_common(ipa, offset, &resource->limits[4], ylimits);
120 offset = IPA_REG_SRC_RSRC_GRP_67_RSRC_TYPE_N_OFFSET(resource_type);
121 ylimits = group_count == 7 ? NULL : &resource->limits[7];
122 ipa_resource_config_common(ipa, offset, &resource->limits[6], ylimits);
125 static void ipa_resource_config_dst(struct ipa *ipa, u32 resource_type,
126 const struct ipa_resource_data *data)
128 u32 group_count = data->rsrc_group_dst_count;
129 const struct ipa_resource_limits *ylimits;
130 const struct ipa_resource *resource;
133 resource = &data->resource_dst[resource_type];
135 offset = IPA_REG_DST_RSRC_GRP_01_RSRC_TYPE_N_OFFSET(resource_type);
136 ylimits = group_count == 1 ? NULL : &resource->limits[1];
137 ipa_resource_config_common(ipa, offset, &resource->limits[0], ylimits);
142 offset = IPA_REG_DST_RSRC_GRP_23_RSRC_TYPE_N_OFFSET(resource_type);
143 ylimits = group_count == 3 ? NULL : &resource->limits[3];
144 ipa_resource_config_common(ipa, offset, &resource->limits[2], ylimits);
149 offset = IPA_REG_DST_RSRC_GRP_45_RSRC_TYPE_N_OFFSET(resource_type);
150 ylimits = group_count == 5 ? NULL : &resource->limits[5];
151 ipa_resource_config_common(ipa, offset, &resource->limits[4], ylimits);
156 offset = IPA_REG_DST_RSRC_GRP_67_RSRC_TYPE_N_OFFSET(resource_type);
157 ylimits = group_count == 7 ? NULL : &resource->limits[7];
158 ipa_resource_config_common(ipa, offset, &resource->limits[6], ylimits);
161 /* Configure resources; there is no ipa_resource_deconfig() */
162 int ipa_resource_config(struct ipa *ipa, const struct ipa_resource_data *data)
166 if (!ipa_resource_limits_valid(ipa, data))
169 for (i = 0; i < data->resource_src_count; i++)
170 ipa_resource_config_src(ipa, i, data);
172 for (i = 0; i < data->resource_dst_count; i++)
173 ipa_resource_config_dst(ipa, i, data);