1 // SPDX-License-Identifier: GPL-2.0 2 /* TI K3 CPPI5 descriptors pool API 3 * 4 * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/device.h> 10 #include <linux/dma-mapping.h> 11 #include <linux/err.h> 12 #include <linux/genalloc.h> 13 #include <linux/kernel.h> 14 15 #include "k3-cppi-desc-pool.h" 16 17 struct k3_cppi_desc_pool { 18 struct device *dev; 19 dma_addr_t dma_addr; 20 void *cpumem; /* dma_alloc map */ 21 size_t desc_size; 22 size_t mem_size; 23 size_t num_desc; 24 struct gen_pool *gen_pool; 25 }; 26 27 void k3_cppi_desc_pool_destroy(struct k3_cppi_desc_pool *pool) 28 { 29 if (!pool) 30 return; 31 32 WARN(gen_pool_size(pool->gen_pool) != gen_pool_avail(pool->gen_pool), 33 "k3_knav_desc_pool size %zu != avail %zu", 34 gen_pool_size(pool->gen_pool), 35 gen_pool_avail(pool->gen_pool)); 36 if (pool->cpumem) 37 dma_free_coherent(pool->dev, pool->mem_size, pool->cpumem, 38 pool->dma_addr); 39 40 gen_pool_destroy(pool->gen_pool); /* frees pool->name */ 41 } 42 43 struct k3_cppi_desc_pool * 44 k3_cppi_desc_pool_create_name(struct device *dev, size_t size, 45 size_t desc_size, 46 const char *name) 47 { 48 struct k3_cppi_desc_pool *pool; 49 const char *pool_name = NULL; 50 int ret = -ENOMEM; 51 52 pool = devm_kzalloc(dev, sizeof(*pool), GFP_KERNEL); 53 if (!pool) 54 return ERR_PTR(ret); 55 56 pool->dev = dev; 57 pool->desc_size = roundup_pow_of_two(desc_size); 58 pool->num_desc = size; 59 pool->mem_size = pool->num_desc * pool->desc_size; 60 61 pool_name = kstrdup_const(name ? name : dev_name(pool->dev), 62 GFP_KERNEL); 63 if (!pool_name) 64 return ERR_PTR(-ENOMEM); 65 66 pool->gen_pool = gen_pool_create(ilog2(pool->desc_size), -1); 67 if (!pool->gen_pool) { 68 ret = -ENOMEM; 69 dev_err(pool->dev, "pool create failed %d\n", ret); 70 kfree_const(pool_name); 71 goto gen_pool_create_fail; 72 } 73 74 pool->gen_pool->name = pool_name; 75 76 pool->cpumem = dma_alloc_coherent(pool->dev, pool->mem_size, 77 &pool->dma_addr, GFP_KERNEL); 78 79 if (!pool->cpumem) 80 goto dma_alloc_fail; 81 82 ret = gen_pool_add_virt(pool->gen_pool, (unsigned long)pool->cpumem, 83 (phys_addr_t)pool->dma_addr, pool->mem_size, 84 -1); 85 if (ret < 0) { 86 dev_err(pool->dev, "pool add failed %d\n", ret); 87 goto gen_pool_add_virt_fail; 88 } 89 90 return pool; 91 92 gen_pool_add_virt_fail: 93 dma_free_coherent(pool->dev, pool->mem_size, pool->cpumem, 94 pool->dma_addr); 95 dma_alloc_fail: 96 gen_pool_destroy(pool->gen_pool); /* frees pool->name */ 97 gen_pool_create_fail: 98 devm_kfree(pool->dev, pool); 99 return ERR_PTR(ret); 100 } 101 102 dma_addr_t k3_cppi_desc_pool_virt2dma(struct k3_cppi_desc_pool *pool, 103 void *addr) 104 { 105 return addr ? pool->dma_addr + (addr - pool->cpumem) : 0; 106 } 107 108 void *k3_cppi_desc_pool_dma2virt(struct k3_cppi_desc_pool *pool, dma_addr_t dma) 109 { 110 return dma ? pool->cpumem + (dma - pool->dma_addr) : NULL; 111 } 112 113 void *k3_cppi_desc_pool_alloc(struct k3_cppi_desc_pool *pool) 114 { 115 return (void *)gen_pool_alloc(pool->gen_pool, pool->desc_size); 116 } 117 118 void k3_cppi_desc_pool_free(struct k3_cppi_desc_pool *pool, void *addr) 119 { 120 gen_pool_free(pool->gen_pool, (unsigned long)addr, pool->desc_size); 121 } 122 123 size_t k3_cppi_desc_pool_avail(struct k3_cppi_desc_pool *pool) 124 { 125 return gen_pool_avail(pool->gen_pool) / pool->desc_size; 126 } 127