1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Common CPM code 4 * 5 * Author: Scott Wood <scottwood@freescale.com> 6 * 7 * Copyright 2007-2008,2010 Freescale Semiconductor, Inc. 8 * 9 * Some parts derived from commproc.c/cpm2_common.c, which is: 10 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net) 11 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com> 12 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com) 13 * 2006 (c) MontaVista Software, Inc. 14 * Vitaly Bordug <vbordug@ru.mvista.com> 15 */ 16 #include <linux/genalloc.h> 17 #include <linux/init.h> 18 #include <linux/list.h> 19 #include <linux/of_device.h> 20 #include <linux/spinlock.h> 21 #include <linux/export.h> 22 #include <linux/of.h> 23 #include <linux/of_address.h> 24 #include <linux/slab.h> 25 #include <linux/io.h> 26 #include <soc/fsl/qe/qe.h> 27 28 static struct gen_pool *muram_pool; 29 static DEFINE_SPINLOCK(cpm_muram_lock); 30 static void __iomem *muram_vbase; 31 static phys_addr_t muram_pbase; 32 33 struct muram_block { 34 struct list_head head; 35 s32 start; 36 int size; 37 }; 38 39 static LIST_HEAD(muram_block_list); 40 41 /* max address size we deal with */ 42 #define OF_MAX_ADDR_CELLS 4 43 #define GENPOOL_OFFSET (4096 * 8) 44 45 int cpm_muram_init(void) 46 { 47 struct device_node *np; 48 struct resource r; 49 __be32 zero[OF_MAX_ADDR_CELLS] = {}; 50 resource_size_t max = 0; 51 int i = 0; 52 int ret = 0; 53 54 if (muram_pbase) 55 return 0; 56 57 np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data"); 58 if (!np) { 59 /* try legacy bindings */ 60 np = of_find_node_by_name(NULL, "data-only"); 61 if (!np) { 62 pr_err("Cannot find CPM muram data node"); 63 ret = -ENODEV; 64 goto out_muram; 65 } 66 } 67 68 muram_pool = gen_pool_create(0, -1); 69 if (!muram_pool) { 70 pr_err("Cannot allocate memory pool for CPM/QE muram"); 71 ret = -ENOMEM; 72 goto out_muram; 73 } 74 muram_pbase = of_translate_address(np, zero); 75 if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) { 76 pr_err("Cannot translate zero through CPM muram node"); 77 ret = -ENODEV; 78 goto out_pool; 79 } 80 81 while (of_address_to_resource(np, i++, &r) == 0) { 82 if (r.end > max) 83 max = r.end; 84 ret = gen_pool_add(muram_pool, r.start - muram_pbase + 85 GENPOOL_OFFSET, resource_size(&r), -1); 86 if (ret) { 87 pr_err("QE: couldn't add muram to pool!\n"); 88 goto out_pool; 89 } 90 } 91 92 muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1); 93 if (!muram_vbase) { 94 pr_err("Cannot map QE muram"); 95 ret = -ENOMEM; 96 goto out_pool; 97 } 98 goto out_muram; 99 out_pool: 100 gen_pool_destroy(muram_pool); 101 out_muram: 102 of_node_put(np); 103 return ret; 104 } 105 106 /* 107 * cpm_muram_alloc_common - cpm_muram_alloc common code 108 * @size: number of bytes to allocate 109 * @algo: algorithm for alloc. 110 * @data: data for genalloc's algorithm. 111 * 112 * This function returns a non-negative offset into the muram area, or 113 * a negative errno on failure. 114 */ 115 static s32 cpm_muram_alloc_common(unsigned long size, 116 genpool_algo_t algo, void *data) 117 { 118 struct muram_block *entry; 119 s32 start; 120 121 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 122 if (!entry) 123 return -ENOMEM; 124 start = gen_pool_alloc_algo(muram_pool, size, algo, data); 125 if (!start) { 126 kfree(entry); 127 return -ENOMEM; 128 } 129 start = start - GENPOOL_OFFSET; 130 memset_io(cpm_muram_addr(start), 0, size); 131 entry->start = start; 132 entry->size = size; 133 list_add(&entry->head, &muram_block_list); 134 135 return start; 136 } 137 138 /* 139 * cpm_muram_alloc - allocate the requested size worth of multi-user ram 140 * @size: number of bytes to allocate 141 * @align: requested alignment, in bytes 142 * 143 * This function returns a non-negative offset into the muram area, or 144 * a negative errno on failure. 145 * Use cpm_dpram_addr() to get the virtual address of the area. 146 * Use cpm_muram_free() to free the allocation. 147 */ 148 s32 cpm_muram_alloc(unsigned long size, unsigned long align) 149 { 150 s32 start; 151 unsigned long flags; 152 struct genpool_data_align muram_pool_data; 153 154 spin_lock_irqsave(&cpm_muram_lock, flags); 155 muram_pool_data.align = align; 156 start = cpm_muram_alloc_common(size, gen_pool_first_fit_align, 157 &muram_pool_data); 158 spin_unlock_irqrestore(&cpm_muram_lock, flags); 159 return start; 160 } 161 EXPORT_SYMBOL(cpm_muram_alloc); 162 163 /** 164 * cpm_muram_free - free a chunk of multi-user ram 165 * @offset: The beginning of the chunk as returned by cpm_muram_alloc(). 166 */ 167 void cpm_muram_free(s32 offset) 168 { 169 unsigned long flags; 170 int size; 171 struct muram_block *tmp; 172 173 if (offset < 0) 174 return; 175 176 size = 0; 177 spin_lock_irqsave(&cpm_muram_lock, flags); 178 list_for_each_entry(tmp, &muram_block_list, head) { 179 if (tmp->start == offset) { 180 size = tmp->size; 181 list_del(&tmp->head); 182 kfree(tmp); 183 break; 184 } 185 } 186 gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size); 187 spin_unlock_irqrestore(&cpm_muram_lock, flags); 188 } 189 EXPORT_SYMBOL(cpm_muram_free); 190 191 /* 192 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram 193 * @offset: offset of allocation start address 194 * @size: number of bytes to allocate 195 * This function returns @offset if the area was available, a negative 196 * errno otherwise. 197 * Use cpm_dpram_addr() to get the virtual address of the area. 198 * Use cpm_muram_free() to free the allocation. 199 */ 200 s32 cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) 201 { 202 s32 start; 203 unsigned long flags; 204 struct genpool_data_fixed muram_pool_data_fixed; 205 206 spin_lock_irqsave(&cpm_muram_lock, flags); 207 muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET; 208 start = cpm_muram_alloc_common(size, gen_pool_fixed_alloc, 209 &muram_pool_data_fixed); 210 spin_unlock_irqrestore(&cpm_muram_lock, flags); 211 return start; 212 } 213 EXPORT_SYMBOL(cpm_muram_alloc_fixed); 214 215 /** 216 * cpm_muram_addr - turn a muram offset into a virtual address 217 * @offset: muram offset to convert 218 */ 219 void __iomem *cpm_muram_addr(unsigned long offset) 220 { 221 return muram_vbase + offset; 222 } 223 EXPORT_SYMBOL(cpm_muram_addr); 224 225 unsigned long cpm_muram_offset(const void __iomem *addr) 226 { 227 return addr - muram_vbase; 228 } 229 EXPORT_SYMBOL(cpm_muram_offset); 230 231 /** 232 * cpm_muram_dma - turn a muram virtual address into a DMA address 233 * @addr: virtual address from cpm_muram_addr() to convert 234 */ 235 dma_addr_t cpm_muram_dma(void __iomem *addr) 236 { 237 return muram_pbase + (addr - muram_vbase); 238 } 239 EXPORT_SYMBOL(cpm_muram_dma); 240 241 /* 242 * As cpm_muram_free, but takes the virtual address rather than the 243 * muram offset. 244 */ 245 void cpm_muram_free_addr(const void __iomem *addr) 246 { 247 if (!addr) 248 return; 249 cpm_muram_free(cpm_muram_offset(addr)); 250 } 251 EXPORT_SYMBOL(cpm_muram_free_addr); 252