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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2021 Intel Corporation * Author: Johannes Berg <johannes@sipsolutions.net> */ #include <linux/types.h> #include <linux/slab.h> #include <linux/logic_iomem.h> struct logic_iomem_region { const struct resource *res; const struct logic_iomem_region_ops *ops; struct list_head list; }; struct logic_iomem_area { const struct logic_iomem_ops *ops; void *priv; }; #define AREA_SHIFT 24 #define MAX_AREA_SIZE (1 << AREA_SHIFT) #define MAX_AREAS ((1ULL<<32) / MAX_AREA_SIZE) #define AREA_BITS ((MAX_AREAS - 1) << AREA_SHIFT) #define AREA_MASK (MAX_AREA_SIZE - 1) #ifdef CONFIG_64BIT #define IOREMAP_BIAS 0xDEAD000000000000UL #define IOREMAP_MASK 0xFFFFFFFF00000000UL #else #define IOREMAP_BIAS 0 #define IOREMAP_MASK 0 #endif static DEFINE_MUTEX(regions_mtx); static LIST_HEAD(regions_list); static struct logic_iomem_area mapped_areas[MAX_AREAS]; int logic_iomem_add_region(struct resource *resource, const struct logic_iomem_region_ops *ops) { struct logic_iomem_region *rreg; int err; if (WARN_ON(!resource || !ops)) return -EINVAL; if (WARN_ON((resource->flags & IORESOURCE_TYPE_BITS) != IORESOURCE_MEM)) return -EINVAL; rreg = kzalloc(sizeof(*rreg), GFP_KERNEL); if (!rreg) return -ENOMEM; err = request_resource(&iomem_resource, resource); if (err) { kfree(rreg); return -ENOMEM; } mutex_lock(®ions_mtx); rreg->res = resource; rreg->ops = ops; list_add_tail(&rreg->list, ®ions_list); mutex_unlock(®ions_mtx); return 0; } EXPORT_SYMBOL(logic_iomem_add_region); #ifndef CONFIG_LOGIC_IOMEM_FALLBACK static void __iomem *real_ioremap(phys_addr_t offset, size_t size) { WARN(1, "invalid ioremap(0x%llx, 0x%zx)\n", (unsigned long long)offset, size); return NULL; } static void real_iounmap(void __iomem *addr) { WARN(1, "invalid iounmap for addr 0x%llx\n", (unsigned long long)addr); } #endif /* CONFIG_LOGIC_IOMEM_FALLBACK */ void __iomem *ioremap(phys_addr_t offset, size_t size) { void __iomem *ret = NULL; struct logic_iomem_region *rreg, *found = NULL; int i; mutex_lock(®ions_mtx); list_for_each_entry(rreg, ®ions_list, list) { if (rreg->res->start > offset) continue; if (rreg->res->end < offset + size - 1) continue; found = rreg; break; } if (!found) goto out; for (i = 0; i < MAX_AREAS; i++) { long offs; if (mapped_areas[i].ops) continue; offs = rreg->ops->map(offset - found->res->start, size, &mapped_areas[i].ops, &mapped_areas[i].priv); if (offs < 0) { mapped_areas[i].ops = NULL; break; } if (WARN_ON(!mapped_areas[i].ops)) { mapped_areas[i].ops = NULL; break; } ret = (void __iomem *)(IOREMAP_BIAS + (i << AREA_SHIFT) + offs); break; } out: mutex_unlock(®ions_mtx); if (ret) return ret; return real_ioremap(offset, size); } EXPORT_SYMBOL(ioremap); static inline struct logic_iomem_area * get_area(const volatile void __iomem *addr) { unsigned long a = (unsigned long)addr; unsigned int idx; if (WARN_ON((a & IOREMAP_MASK) != IOREMAP_BIAS)) return NULL; idx = (a & AREA_BITS) >> AREA_SHIFT; if (mapped_areas[idx].ops) return &mapped_areas[idx]; return NULL; } void iounmap(void __iomem *addr) { struct logic_iomem_area *area = get_area(addr); if (!area) { real_iounmap(addr); return; } if (area->ops->unmap) area->ops->unmap(area->priv); mutex_lock(®ions_mtx); area->ops = NULL; area->priv = NULL; mutex_unlock(®ions_mtx); } EXPORT_SYMBOL(iounmap); #ifndef CONFIG_LOGIC_IOMEM_FALLBACK #define MAKE_FALLBACK(op, sz) \ static u##sz real_raw_read ## op(const volatile void __iomem *addr) \ { \ WARN(1, "Invalid read" #op " at address %llx\n", \ (unsigned long long)addr); \ return (u ## sz)~0ULL; \ } \ \ void real_raw_write ## op(u ## sz val, volatile void __iomem *addr) \ { \ WARN(1, "Invalid writeq" #op " of 0x%llx at address %llx\n", \ (unsigned long long)val, (unsigned long long)addr); \ } \ MAKE_FALLBACK(b, 8); MAKE_FALLBACK(w, 16); MAKE_FALLBACK(l, 32); #ifdef CONFIG_64BIT MAKE_FALLBACK(q, 64); #endif static void real_memset_io(volatile void __iomem *addr, int value, size_t size) { WARN(1, "Invalid memset_io at address 0x%llx\n", (unsigned long long)addr); } static void real_memcpy_fromio(void *buffer, const volatile void __iomem *addr, size_t size) { WARN(1, "Invalid memcpy_fromio at address 0x%llx\n", (unsigned long long)addr); memset(buffer, 0xff, size); } static void real_memcpy_toio(volatile void __iomem *addr, const void *buffer, size_t size) { WARN(1, "Invalid memcpy_toio at address 0x%llx\n", (unsigned long long)addr); } #endif /* CONFIG_LOGIC_IOMEM_FALLBACK */ #define MAKE_OP(op, sz) \ u##sz __raw_read ## op(const volatile void __iomem *addr) \ { \ struct logic_iomem_area *area = get_area(addr); \ \ if (!area) \ return real_raw_read ## op(addr); \ \ return (u ## sz) area->ops->read(area->priv, \ (unsigned long)addr & AREA_MASK,\ sz / 8); \ } \ EXPORT_SYMBOL(__raw_read ## op); \ \ void __raw_write ## op(u ## sz val, volatile void __iomem *addr) \ { \ struct logic_iomem_area *area = get_area(addr); \ \ if (!area) { \ real_raw_write ## op(val, addr); \ return; \ } \ \ area->ops->write(area->priv, \ (unsigned long)addr & AREA_MASK, \ sz / 8, val); \ } \ EXPORT_SYMBOL(__raw_write ## op) MAKE_OP(b, 8); MAKE_OP(w, 16); MAKE_OP(l, 32); #ifdef CONFIG_64BIT MAKE_OP(q, 64); #endif void memset_io(volatile void __iomem *addr, int value, size_t size) { struct logic_iomem_area *area = get_area(addr); unsigned long offs, start; if (!area) { real_memset_io(addr, value, size); return; } start = (unsigned long)addr & AREA_MASK; if (area->ops->set) { area->ops->set(area->priv, start, value, size); return; } for (offs = 0; offs < size; offs++) area->ops->write(area->priv, start + offs, 1, value); } EXPORT_SYMBOL(memset_io); void memcpy_fromio(void *buffer, const volatile void __iomem *addr, size_t size) { struct logic_iomem_area *area = get_area(addr); u8 *buf = buffer; unsigned long offs, start; if (!area) { real_memcpy_fromio(buffer, addr, size); return; } start = (unsigned long)addr & AREA_MASK; if (area->ops->copy_from) { area->ops->copy_from(area->priv, buffer, start, size); return; } for (offs = 0; offs < size; offs++) buf[offs] = area->ops->read(area->priv, start + offs, 1); } EXPORT_SYMBOL(memcpy_fromio); void memcpy_toio(volatile void __iomem *addr, const void *buffer, size_t size) { struct logic_iomem_area *area = get_area(addr); const u8 *buf = buffer; unsigned long offs, start; if (!area) { real_memcpy_toio(addr, buffer, size); return; } start = (unsigned long)addr & AREA_MASK; if (area->ops->copy_to) { area->ops->copy_to(area->priv, start, buffer, size); return; } for (offs = 0; offs < size; offs++) area->ops->write(area->priv, start + offs, 1, buf[offs]); } EXPORT_SYMBOL(memcpy_toio); |