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1// SPDX-License-Identifier: GPL-2.0+2/* Microchip Sparx5 Switch driver3 *4 * Copyright (c) 2023 Microchip Technology Inc. and its subsidiaries.5 */6 7#include "sparx5_main_regs.h"8#include "sparx5_main.h"9 10static u32 sparx5_pool_id_to_idx(u32 id)11{12 return --id;13}14 15u32 sparx5_pool_idx_to_id(u32 idx)16{17 return ++idx;18}19 20/* Release resource from pool.21 * Return reference count on success, otherwise return error.22 */23int sparx5_pool_put(struct sparx5_pool_entry *pool, int size, u32 id)24{25 struct sparx5_pool_entry *e_itr;26 27 e_itr = (pool + sparx5_pool_id_to_idx(id));28 if (e_itr->ref_cnt == 0)29 return -EINVAL;30 31 return --e_itr->ref_cnt;32}33 34/* Get resource from pool.35 * Return reference count on success, otherwise return error.36 */37int sparx5_pool_get(struct sparx5_pool_entry *pool, int size, u32 *id)38{39 struct sparx5_pool_entry *e_itr;40 int i;41 42 for (i = 0, e_itr = pool; i < size; i++, e_itr++) {43 if (e_itr->ref_cnt == 0) {44 *id = sparx5_pool_idx_to_id(i);45 return ++e_itr->ref_cnt;46 }47 }48 49 return -ENOSPC;50}51 52/* Get resource from pool that matches index.53 * Return reference count on success, otherwise return error.54 */55int sparx5_pool_get_with_idx(struct sparx5_pool_entry *pool, int size, u32 idx,56 u32 *id)57{58 struct sparx5_pool_entry *e_itr;59 int i, ret = -ENOSPC;60 61 for (i = 0, e_itr = pool; i < size; i++, e_itr++) {62 /* Pool index of first free entry */63 if (e_itr->ref_cnt == 0 && ret == -ENOSPC)64 ret = i;65 /* Tc index already in use ? */66 if (e_itr->idx == idx && e_itr->ref_cnt > 0) {67 ret = i;68 break;69 }70 }71 72 /* Did we find a free entry? */73 if (ret >= 0) {74 *id = sparx5_pool_idx_to_id(ret);75 e_itr = (pool + ret);76 e_itr->idx = idx;77 return ++e_itr->ref_cnt;78 }79 80 return ret;81}82