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// 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)
{
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_dst_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;
}
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_n_offset(ipa, SRC_RSRC_GRP_01_RSRC_TYPE,
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_n_offset(ipa, SRC_RSRC_GRP_23_RSRC_TYPE,
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_n_offset(ipa, SRC_RSRC_GRP_45_RSRC_TYPE,
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_n_offset(ipa, SRC_RSRC_GRP_67_RSRC_TYPE,
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_n_offset(ipa, DST_RSRC_GRP_01_RSRC_TYPE,
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_n_offset(ipa, DST_RSRC_GRP_23_RSRC_TYPE,
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_n_offset(ipa, DST_RSRC_GRP_45_RSRC_TYPE,
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_n_offset(ipa, DST_RSRC_GRP_67_RSRC_TYPE,
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;
}
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