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 spinlock_t cpm_muram_lock; 30 static u8 __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 u32 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 spin_lock_init(&cpm_muram_lock); 58 np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data"); 59 if (!np) { 60 /* try legacy bindings */ 61 np = of_find_node_by_name(NULL, "data-only"); 62 if (!np) { 63 pr_err("Cannot find CPM muram data node"); 64 ret = -ENODEV; 65 goto out_muram; 66 } 67 } 68 69 muram_pool = gen_pool_create(0, -1); 70 if (!muram_pool) { 71 pr_err("Cannot allocate memory pool for CPM/QE muram"); 72 ret = -ENOMEM; 73 goto out_muram; 74 } 75 muram_pbase = of_translate_address(np, zero); 76 if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) { 77 pr_err("Cannot translate zero through CPM muram node"); 78 ret = -ENODEV; 79 goto out_pool; 80 } 81 82 while (of_address_to_resource(np, i++, &r) == 0) { 83 if (r.end > max) 84 max = r.end; 85 ret = gen_pool_add(muram_pool, r.start - muram_pbase + 86 GENPOOL_OFFSET, resource_size(&r), -1); 87 if (ret) { 88 pr_err("QE: couldn't add muram to pool!\n"); 89 goto out_pool; 90 } 91 } 92 93 muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1); 94 if (!muram_vbase) { 95 pr_err("Cannot map QE muram"); 96 ret = -ENOMEM; 97 goto out_pool; 98 } 99 goto out_muram; 100 out_pool: 101 gen_pool_destroy(muram_pool); 102 out_muram: 103 of_node_put(np); 104 return ret; 105 } 106 107 /* 108 * cpm_muram_alloc_common - cpm_muram_alloc common code 109 * @size: number of bytes to allocate 110 * @algo: algorithm for alloc. 111 * @data: data for genalloc's algorithm. 112 * 113 * This function returns a non-negative offset into the muram area, or 114 * a negative errno on failure. 115 */ 116 static s32 cpm_muram_alloc_common(unsigned long size, 117 genpool_algo_t algo, void *data) 118 { 119 struct muram_block *entry; 120 s32 start; 121 122 if (!muram_pool && cpm_muram_init()) 123 goto out2; 124 125 start = gen_pool_alloc_algo(muram_pool, size, algo, data); 126 if (!start) 127 goto out2; 128 start = start - GENPOOL_OFFSET; 129 memset_io(cpm_muram_addr(start), 0, size); 130 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 131 if (!entry) 132 goto out1; 133 entry->start = start; 134 entry->size = size; 135 list_add(&entry->head, &muram_block_list); 136 137 return start; 138 out1: 139 gen_pool_free(muram_pool, start, size); 140 out2: 141 return -ENOMEM; 142 } 143 144 /* 145 * cpm_muram_alloc - allocate the requested size worth of multi-user ram 146 * @size: number of bytes to allocate 147 * @align: requested alignment, in bytes 148 * 149 * This function returns a non-negative offset into the muram area, or 150 * a negative errno on failure. 151 * Use cpm_dpram_addr() to get the virtual address of the area. 152 * Use cpm_muram_free() to free the allocation. 153 */ 154 s32 cpm_muram_alloc(unsigned long size, unsigned long align) 155 { 156 s32 start; 157 unsigned long flags; 158 struct genpool_data_align muram_pool_data; 159 160 spin_lock_irqsave(&cpm_muram_lock, flags); 161 muram_pool_data.align = align; 162 start = cpm_muram_alloc_common(size, gen_pool_first_fit_align, 163 &muram_pool_data); 164 spin_unlock_irqrestore(&cpm_muram_lock, flags); 165 return start; 166 } 167 EXPORT_SYMBOL(cpm_muram_alloc); 168 169 /** 170 * cpm_muram_free - free a chunk of multi-user ram 171 * @offset: The beginning of the chunk as returned by cpm_muram_alloc(). 172 */ 173 void cpm_muram_free(s32 offset) 174 { 175 unsigned long flags; 176 int size; 177 struct muram_block *tmp; 178 179 if (offset < 0) 180 return; 181 182 size = 0; 183 spin_lock_irqsave(&cpm_muram_lock, flags); 184 list_for_each_entry(tmp, &muram_block_list, head) { 185 if (tmp->start == offset) { 186 size = tmp->size; 187 list_del(&tmp->head); 188 kfree(tmp); 189 break; 190 } 191 } 192 gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size); 193 spin_unlock_irqrestore(&cpm_muram_lock, flags); 194 } 195 EXPORT_SYMBOL(cpm_muram_free); 196 197 /* 198 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram 199 * @offset: offset of allocation start address 200 * @size: number of bytes to allocate 201 * This function returns @offset if the area was available, a negative 202 * errno otherwise. 203 * Use cpm_dpram_addr() to get the virtual address of the area. 204 * Use cpm_muram_free() to free the allocation. 205 */ 206 s32 cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) 207 { 208 s32 start; 209 unsigned long flags; 210 struct genpool_data_fixed muram_pool_data_fixed; 211 212 spin_lock_irqsave(&cpm_muram_lock, flags); 213 muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET; 214 start = cpm_muram_alloc_common(size, gen_pool_fixed_alloc, 215 &muram_pool_data_fixed); 216 spin_unlock_irqrestore(&cpm_muram_lock, flags); 217 return start; 218 } 219 EXPORT_SYMBOL(cpm_muram_alloc_fixed); 220 221 /** 222 * cpm_muram_addr - turn a muram offset into a virtual address 223 * @offset: muram offset to convert 224 */ 225 void __iomem *cpm_muram_addr(unsigned long offset) 226 { 227 return muram_vbase + offset; 228 } 229 EXPORT_SYMBOL(cpm_muram_addr); 230 231 unsigned long cpm_muram_offset(void __iomem *addr) 232 { 233 return addr - (void __iomem *)muram_vbase; 234 } 235 EXPORT_SYMBOL(cpm_muram_offset); 236 237 /** 238 * cpm_muram_dma - turn a muram virtual address into a DMA address 239 * @offset: virtual address from cpm_muram_addr() to convert 240 */ 241 dma_addr_t cpm_muram_dma(void __iomem *addr) 242 { 243 return muram_pbase + ((u8 __iomem *)addr - muram_vbase); 244 } 245 EXPORT_SYMBOL(cpm_muram_dma); 246