| // SPDX-License-Identifier: GPL-2.0 |
| |
| /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved. |
| * Copyright (C) 2018-2021 Linaro Ltd. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| |
| #include "ipa.h" |
| #include "ipa_data.h" |
| #include "ipa_reg.h" |
| #include "ipa_resource.h" |
| |
| /** |
| * DOC: IPA Resources |
| * |
| * The IPA manages a set of resources internally for various purposes. |
| * A given IPA version has a fixed number of resource types, and a fixed |
| * total number of resources of each type. "Source" resource types |
| * are separate from "destination" resource types. |
| * |
| * Each version of IPA also has some number of resource groups. Each |
| * endpoint is assigned to a resource group, and all endpoints in the |
| * same group share pools of each type of resource. A subset of the |
| * total resources of each type is assigned for use by each group. |
| */ |
| |
| static bool ipa_resource_limits_valid(struct ipa *ipa, |
| const struct ipa_resource_data *data) |
| { |
| #ifdef IPA_VALIDATION |
| u32 group_count; |
| u32 i; |
| u32 j; |
| |
| /* We program at most 8 source or destination resource group limits */ |
| BUILD_BUG_ON(IPA_RESOURCE_GROUP_MAX > 8); |
| |
| group_count = data->rsrc_group_src_count; |
| if (!group_count || group_count > IPA_RESOURCE_GROUP_MAX) |
| return false; |
| |
| /* Return an error if a non-zero resource limit is specified |
| * for a resource group not supported by hardware. |
| */ |
| for (i = 0; i < data->resource_src_count; i++) { |
| const struct ipa_resource *resource; |
| |
| resource = &data->resource_src[i]; |
| for (j = group_count; j < IPA_RESOURCE_GROUP_MAX; j++) |
| if (resource->limits[j].min || resource->limits[j].max) |
| return false; |
| } |
| |
| group_count = data->rsrc_group_src_count; |
| if (!group_count || group_count > IPA_RESOURCE_GROUP_MAX) |
| return false; |
| |
| for (i = 0; i < data->resource_dst_count; i++) { |
| const struct ipa_resource *resource; |
| |
| resource = &data->resource_dst[i]; |
| for (j = group_count; j < IPA_RESOURCE_GROUP_MAX; j++) |
| if (resource->limits[j].min || resource->limits[j].max) |
| return false; |
| } |
| #endif /* !IPA_VALIDATION */ |
| return true; |
| } |
| |
| static void |
| ipa_resource_config_common(struct ipa *ipa, u32 offset, |
| const struct ipa_resource_limits *xlimits, |
| const struct ipa_resource_limits *ylimits) |
| { |
| u32 val; |
| |
| val = u32_encode_bits(xlimits->min, X_MIN_LIM_FMASK); |
| val |= u32_encode_bits(xlimits->max, X_MAX_LIM_FMASK); |
| if (ylimits) { |
| val |= u32_encode_bits(ylimits->min, Y_MIN_LIM_FMASK); |
| val |= u32_encode_bits(ylimits->max, Y_MAX_LIM_FMASK); |
| } |
| |
| iowrite32(val, ipa->reg_virt + offset); |
| } |
| |
| static void ipa_resource_config_src(struct ipa *ipa, u32 resource_type, |
| const struct ipa_resource_data *data) |
| { |
| u32 group_count = data->rsrc_group_src_count; |
| const struct ipa_resource_limits *ylimits; |
| const struct ipa_resource *resource; |
| u32 offset; |
| |
| resource = &data->resource_src[resource_type]; |
| |
| offset = IPA_REG_SRC_RSRC_GRP_01_RSRC_TYPE_N_OFFSET(resource_type); |
| ylimits = group_count == 1 ? NULL : &resource->limits[1]; |
| ipa_resource_config_common(ipa, offset, &resource->limits[0], ylimits); |
| |
| if (group_count < 3) |
| return; |
| |
| offset = IPA_REG_SRC_RSRC_GRP_23_RSRC_TYPE_N_OFFSET(resource_type); |
| ylimits = group_count == 3 ? NULL : &resource->limits[3]; |
| ipa_resource_config_common(ipa, offset, &resource->limits[2], ylimits); |
| |
| if (group_count < 5) |
| return; |
| |
| offset = IPA_REG_SRC_RSRC_GRP_45_RSRC_TYPE_N_OFFSET(resource_type); |
| ylimits = group_count == 5 ? NULL : &resource->limits[5]; |
| ipa_resource_config_common(ipa, offset, &resource->limits[4], ylimits); |
| |
| if (group_count < 7) |
| return; |
| |
| offset = IPA_REG_SRC_RSRC_GRP_67_RSRC_TYPE_N_OFFSET(resource_type); |
| ylimits = group_count == 7 ? NULL : &resource->limits[7]; |
| ipa_resource_config_common(ipa, offset, &resource->limits[6], ylimits); |
| } |
| |
| static void ipa_resource_config_dst(struct ipa *ipa, u32 resource_type, |
| const struct ipa_resource_data *data) |
| { |
| u32 group_count = data->rsrc_group_dst_count; |
| const struct ipa_resource_limits *ylimits; |
| const struct ipa_resource *resource; |
| u32 offset; |
| |
| resource = &data->resource_dst[resource_type]; |
| |
| offset = IPA_REG_DST_RSRC_GRP_01_RSRC_TYPE_N_OFFSET(resource_type); |
| ylimits = group_count == 1 ? NULL : &resource->limits[1]; |
| ipa_resource_config_common(ipa, offset, &resource->limits[0], ylimits); |
| |
| if (group_count < 3) |
| return; |
| |
| offset = IPA_REG_DST_RSRC_GRP_23_RSRC_TYPE_N_OFFSET(resource_type); |
| ylimits = group_count == 3 ? NULL : &resource->limits[3]; |
| ipa_resource_config_common(ipa, offset, &resource->limits[2], ylimits); |
| |
| if (group_count < 5) |
| return; |
| |
| offset = IPA_REG_DST_RSRC_GRP_45_RSRC_TYPE_N_OFFSET(resource_type); |
| ylimits = group_count == 5 ? NULL : &resource->limits[5]; |
| ipa_resource_config_common(ipa, offset, &resource->limits[4], ylimits); |
| |
| if (group_count < 7) |
| return; |
| |
| offset = IPA_REG_DST_RSRC_GRP_67_RSRC_TYPE_N_OFFSET(resource_type); |
| ylimits = group_count == 7 ? NULL : &resource->limits[7]; |
| ipa_resource_config_common(ipa, offset, &resource->limits[6], ylimits); |
| } |
| |
| /* Configure resources; there is no ipa_resource_deconfig() */ |
| int ipa_resource_config(struct ipa *ipa, const struct ipa_resource_data *data) |
| { |
| u32 i; |
| |
| if (!ipa_resource_limits_valid(ipa, data)) |
| return -EINVAL; |
| |
| for (i = 0; i < data->resource_src_count; i++) |
| ipa_resource_config_src(ipa, i, data); |
| |
| for (i = 0; i < data->resource_dst_count; i++) |
| ipa_resource_config_dst(ipa, i, data); |
| |
| return 0; |
| } |