// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved. * Copyright (C) 2018-2024 Linaro Ltd. */ #include <linux/types.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 voidipa_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){	u32 val; 	val = reg_encode(reg, X_MIN_LIM, xlimits->min);	val |= reg_encode(reg, X_MAX_LIM, xlimits->max);	if (ylimits) {		val |= reg_encode(reg, Y_MIN_LIM, ylimits->min);		val |= reg_encode(reg, Y_MAX_LIM, ylimits->max);	} 	iowrite32(val, ipa->reg_virt + reg_n_offset(reg, resource_type));} 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;	const struct reg *reg; 	resource = &data->resource_src[resource_type]; 	reg = ipa_reg(ipa, SRC_RSRC_GRP_01_RSRC_TYPE);	ylimits = group_count == 1 ? NULL : &resource->limits[1];	ipa_resource_config_common(ipa, resource_type, reg,				   &resource->limits[0], ylimits);	if (group_count < 3)		return; 	reg = ipa_reg(ipa, SRC_RSRC_GRP_23_RSRC_TYPE);	ylimits = group_count == 3 ? NULL : &resource->limits[3];	ipa_resource_config_common(ipa, resource_type, reg,				   &resource->limits[2], ylimits);	if (group_count < 5)		return; 	reg = ipa_reg(ipa, SRC_RSRC_GRP_45_RSRC_TYPE);	ylimits = group_count == 5 ? NULL : &resource->limits[5];	ipa_resource_config_common(ipa, resource_type, reg,				   &resource->limits[4], ylimits);	if (group_count < 7)		return; 	reg = ipa_reg(ipa, SRC_RSRC_GRP_67_RSRC_TYPE);	ylimits = group_count == 7 ? NULL : &resource->limits[7];	ipa_resource_config_common(ipa, resource_type, reg,				   &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;	const struct reg *reg; 	resource = &data->resource_dst[resource_type]; 	reg = ipa_reg(ipa, DST_RSRC_GRP_01_RSRC_TYPE);	ylimits = group_count == 1 ? NULL : &resource->limits[1];	ipa_resource_config_common(ipa, resource_type, reg,				   &resource->limits[0], ylimits);	if (group_count < 3)		return; 	reg = ipa_reg(ipa, DST_RSRC_GRP_23_RSRC_TYPE);	ylimits = group_count == 3 ? NULL : &resource->limits[3];	ipa_resource_config_common(ipa, resource_type, reg,				   &resource->limits[2], ylimits);	if (group_count < 5)		return; 	reg = ipa_reg(ipa, DST_RSRC_GRP_45_RSRC_TYPE);	ylimits = group_count == 5 ? NULL : &resource->limits[5];	ipa_resource_config_common(ipa, resource_type, reg,				   &resource->limits[4], ylimits);	if (group_count < 7)		return; 	reg = ipa_reg(ipa, DST_RSRC_GRP_67_RSRC_TYPE);	ylimits = group_count == 7 ? NULL : &resource->limits[7];	ipa_resource_config_common(ipa, resource_type, reg,				   &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;}