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 void **desc_infos; 26 }; 27 28 void k3_cppi_desc_pool_destroy(struct k3_cppi_desc_pool *pool) 29 { 30 if (!pool) 31 return; 32 33 WARN(gen_pool_size(pool->gen_pool) != gen_pool_avail(pool->gen_pool), 34 "k3_knav_desc_pool size %zu != avail %zu", 35 gen_pool_size(pool->gen_pool), 36 gen_pool_avail(pool->gen_pool)); 37 if (pool->cpumem) 38 dma_free_coherent(pool->dev, pool->mem_size, pool->cpumem, 39 pool->dma_addr); 40 41 kfree(pool->desc_infos); 42 43 gen_pool_destroy(pool->gen_pool); /* frees pool->name */ 44 45 kfree(pool); 46 } 47 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_destroy); 48 49 struct k3_cppi_desc_pool * 50 k3_cppi_desc_pool_create_name(struct device *dev, size_t size, 51 size_t desc_size, 52 const char *name) 53 { 54 struct k3_cppi_desc_pool *pool; 55 const char *pool_name = NULL; 56 int ret = -ENOMEM; 57 58 pool = kzalloc_obj(*pool); 59 if (!pool) 60 return ERR_PTR(ret); 61 62 pool->dev = dev; 63 pool->desc_size = roundup_pow_of_two(desc_size); 64 pool->num_desc = size; 65 pool->mem_size = pool->num_desc * pool->desc_size; 66 67 pool_name = kstrdup_const(name ? name : dev_name(pool->dev), 68 GFP_KERNEL); 69 if (!pool_name) 70 goto gen_pool_create_fail; 71 72 pool->gen_pool = gen_pool_create(ilog2(pool->desc_size), -1); 73 if (!pool->gen_pool) { 74 kfree_const(pool_name); 75 goto gen_pool_create_fail; 76 } 77 78 pool->gen_pool->name = pool_name; 79 80 pool->desc_infos = kzalloc_objs(*pool->desc_infos, pool->num_desc); 81 if (!pool->desc_infos) 82 goto gen_pool_desc_infos_alloc_fail; 83 84 pool->cpumem = dma_alloc_coherent(pool->dev, pool->mem_size, 85 &pool->dma_addr, GFP_KERNEL); 86 87 if (!pool->cpumem) 88 goto dma_alloc_fail; 89 90 ret = gen_pool_add_virt(pool->gen_pool, (unsigned long)pool->cpumem, 91 (phys_addr_t)pool->dma_addr, pool->mem_size, 92 -1); 93 if (ret < 0) { 94 dev_err(pool->dev, "pool add failed %d\n", ret); 95 goto gen_pool_add_virt_fail; 96 } 97 98 return pool; 99 100 gen_pool_add_virt_fail: 101 dma_free_coherent(pool->dev, pool->mem_size, pool->cpumem, 102 pool->dma_addr); 103 dma_alloc_fail: 104 kfree(pool->desc_infos); 105 gen_pool_desc_infos_alloc_fail: 106 gen_pool_destroy(pool->gen_pool); /* frees pool->name */ 107 gen_pool_create_fail: 108 kfree(pool); 109 return ERR_PTR(ret); 110 } 111 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_create_name); 112 113 dma_addr_t k3_cppi_desc_pool_virt2dma(struct k3_cppi_desc_pool *pool, 114 void *addr) 115 { 116 return addr ? pool->dma_addr + (addr - pool->cpumem) : 0; 117 } 118 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_virt2dma); 119 120 void *k3_cppi_desc_pool_dma2virt(struct k3_cppi_desc_pool *pool, dma_addr_t dma) 121 { 122 return dma ? pool->cpumem + (dma - pool->dma_addr) : NULL; 123 } 124 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_dma2virt); 125 126 void *k3_cppi_desc_pool_alloc(struct k3_cppi_desc_pool *pool) 127 { 128 return (void *)gen_pool_alloc(pool->gen_pool, pool->desc_size); 129 } 130 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_alloc); 131 132 void k3_cppi_desc_pool_free(struct k3_cppi_desc_pool *pool, void *addr) 133 { 134 gen_pool_free(pool->gen_pool, (unsigned long)addr, pool->desc_size); 135 } 136 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_free); 137 138 size_t k3_cppi_desc_pool_avail(struct k3_cppi_desc_pool *pool) 139 { 140 return gen_pool_avail(pool->gen_pool) / pool->desc_size; 141 } 142 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_avail); 143 144 size_t k3_cppi_desc_pool_desc_size(const struct k3_cppi_desc_pool *pool) 145 { 146 return pool->desc_size; 147 } 148 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_desc_size); 149 150 void *k3_cppi_desc_pool_cpuaddr(const struct k3_cppi_desc_pool *pool) 151 { 152 return pool->cpumem; 153 } 154 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_cpuaddr); 155 156 void k3_cppi_desc_pool_desc_info_set(struct k3_cppi_desc_pool *pool, 157 int desc_idx, void *info) 158 { 159 pool->desc_infos[desc_idx] = info; 160 } 161 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_desc_info_set); 162 163 void *k3_cppi_desc_pool_desc_info(const struct k3_cppi_desc_pool *pool, 164 int desc_idx) 165 { 166 return pool->desc_infos[desc_idx]; 167 } 168 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_desc_info); 169 170 MODULE_LICENSE("GPL"); 171 MODULE_DESCRIPTION("TI K3 CPPI5 descriptors pool API"); 172