KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1 | /* linux/drivers/iommu/exynos_iommu.c |
| 2 | * |
| 3 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. |
| 4 | * http://www.samsung.com |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #ifdef CONFIG_EXYNOS_IOMMU_DEBUG |
| 12 | #define DEBUG |
| 13 | #endif |
| 14 | |
| 15 | #include <linux/io.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/pm_runtime.h> |
| 20 | #include <linux/clk.h> |
| 21 | #include <linux/err.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/iommu.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/list.h> |
| 26 | #include <linux/memblock.h> |
| 27 | #include <linux/export.h> |
| 28 | |
| 29 | #include <asm/cacheflush.h> |
| 30 | #include <asm/pgtable.h> |
| 31 | |
| 32 | #include <mach/sysmmu.h> |
| 33 | |
| 34 | /* We does not consider super section mapping (16MB) */ |
| 35 | #define SECT_ORDER 20 |
| 36 | #define LPAGE_ORDER 16 |
| 37 | #define SPAGE_ORDER 12 |
| 38 | |
| 39 | #define SECT_SIZE (1 << SECT_ORDER) |
| 40 | #define LPAGE_SIZE (1 << LPAGE_ORDER) |
| 41 | #define SPAGE_SIZE (1 << SPAGE_ORDER) |
| 42 | |
| 43 | #define SECT_MASK (~(SECT_SIZE - 1)) |
| 44 | #define LPAGE_MASK (~(LPAGE_SIZE - 1)) |
| 45 | #define SPAGE_MASK (~(SPAGE_SIZE - 1)) |
| 46 | |
| 47 | #define lv1ent_fault(sent) (((*(sent) & 3) == 0) || ((*(sent) & 3) == 3)) |
| 48 | #define lv1ent_page(sent) ((*(sent) & 3) == 1) |
| 49 | #define lv1ent_section(sent) ((*(sent) & 3) == 2) |
| 50 | |
| 51 | #define lv2ent_fault(pent) ((*(pent) & 3) == 0) |
| 52 | #define lv2ent_small(pent) ((*(pent) & 2) == 2) |
| 53 | #define lv2ent_large(pent) ((*(pent) & 3) == 1) |
| 54 | |
| 55 | #define section_phys(sent) (*(sent) & SECT_MASK) |
| 56 | #define section_offs(iova) ((iova) & 0xFFFFF) |
| 57 | #define lpage_phys(pent) (*(pent) & LPAGE_MASK) |
| 58 | #define lpage_offs(iova) ((iova) & 0xFFFF) |
| 59 | #define spage_phys(pent) (*(pent) & SPAGE_MASK) |
| 60 | #define spage_offs(iova) ((iova) & 0xFFF) |
| 61 | |
| 62 | #define lv1ent_offset(iova) ((iova) >> SECT_ORDER) |
| 63 | #define lv2ent_offset(iova) (((iova) & 0xFF000) >> SPAGE_ORDER) |
| 64 | |
| 65 | #define NUM_LV1ENTRIES 4096 |
| 66 | #define NUM_LV2ENTRIES 256 |
| 67 | |
| 68 | #define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(long)) |
| 69 | |
| 70 | #define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE) |
| 71 | |
| 72 | #define lv2table_base(sent) (*(sent) & 0xFFFFFC00) |
| 73 | |
| 74 | #define mk_lv1ent_sect(pa) ((pa) | 2) |
| 75 | #define mk_lv1ent_page(pa) ((pa) | 1) |
| 76 | #define mk_lv2ent_lpage(pa) ((pa) | 1) |
| 77 | #define mk_lv2ent_spage(pa) ((pa) | 2) |
| 78 | |
| 79 | #define CTRL_ENABLE 0x5 |
| 80 | #define CTRL_BLOCK 0x7 |
| 81 | #define CTRL_DISABLE 0x0 |
| 82 | |
| 83 | #define REG_MMU_CTRL 0x000 |
| 84 | #define REG_MMU_CFG 0x004 |
| 85 | #define REG_MMU_STATUS 0x008 |
| 86 | #define REG_MMU_FLUSH 0x00C |
| 87 | #define REG_MMU_FLUSH_ENTRY 0x010 |
| 88 | #define REG_PT_BASE_ADDR 0x014 |
| 89 | #define REG_INT_STATUS 0x018 |
| 90 | #define REG_INT_CLEAR 0x01C |
| 91 | |
| 92 | #define REG_PAGE_FAULT_ADDR 0x024 |
| 93 | #define REG_AW_FAULT_ADDR 0x028 |
| 94 | #define REG_AR_FAULT_ADDR 0x02C |
| 95 | #define REG_DEFAULT_SLAVE_ADDR 0x030 |
| 96 | |
| 97 | #define REG_MMU_VERSION 0x034 |
| 98 | |
| 99 | #define REG_PB0_SADDR 0x04C |
| 100 | #define REG_PB0_EADDR 0x050 |
| 101 | #define REG_PB1_SADDR 0x054 |
| 102 | #define REG_PB1_EADDR 0x058 |
| 103 | |
| 104 | static unsigned long *section_entry(unsigned long *pgtable, unsigned long iova) |
| 105 | { |
| 106 | return pgtable + lv1ent_offset(iova); |
| 107 | } |
| 108 | |
| 109 | static unsigned long *page_entry(unsigned long *sent, unsigned long iova) |
| 110 | { |
| 111 | return (unsigned long *)__va(lv2table_base(sent)) + lv2ent_offset(iova); |
| 112 | } |
| 113 | |
| 114 | enum exynos_sysmmu_inttype { |
| 115 | SYSMMU_PAGEFAULT, |
| 116 | SYSMMU_AR_MULTIHIT, |
| 117 | SYSMMU_AW_MULTIHIT, |
| 118 | SYSMMU_BUSERROR, |
| 119 | SYSMMU_AR_SECURITY, |
| 120 | SYSMMU_AR_ACCESS, |
| 121 | SYSMMU_AW_SECURITY, |
| 122 | SYSMMU_AW_PROTECTION, /* 7 */ |
| 123 | SYSMMU_FAULT_UNKNOWN, |
| 124 | SYSMMU_FAULTS_NUM |
| 125 | }; |
| 126 | |
| 127 | /* |
| 128 | * @itype: type of fault. |
| 129 | * @pgtable_base: the physical address of page table base. This is 0 if @itype |
| 130 | * is SYSMMU_BUSERROR. |
| 131 | * @fault_addr: the device (virtual) address that the System MMU tried to |
| 132 | * translated. This is 0 if @itype is SYSMMU_BUSERROR. |
| 133 | */ |
| 134 | typedef int (*sysmmu_fault_handler_t)(enum exynos_sysmmu_inttype itype, |
| 135 | unsigned long pgtable_base, unsigned long fault_addr); |
| 136 | |
| 137 | static unsigned short fault_reg_offset[SYSMMU_FAULTS_NUM] = { |
| 138 | REG_PAGE_FAULT_ADDR, |
| 139 | REG_AR_FAULT_ADDR, |
| 140 | REG_AW_FAULT_ADDR, |
| 141 | REG_DEFAULT_SLAVE_ADDR, |
| 142 | REG_AR_FAULT_ADDR, |
| 143 | REG_AR_FAULT_ADDR, |
| 144 | REG_AW_FAULT_ADDR, |
| 145 | REG_AW_FAULT_ADDR |
| 146 | }; |
| 147 | |
| 148 | static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = { |
| 149 | "PAGE FAULT", |
| 150 | "AR MULTI-HIT FAULT", |
| 151 | "AW MULTI-HIT FAULT", |
| 152 | "BUS ERROR", |
| 153 | "AR SECURITY PROTECTION FAULT", |
| 154 | "AR ACCESS PROTECTION FAULT", |
| 155 | "AW SECURITY PROTECTION FAULT", |
| 156 | "AW ACCESS PROTECTION FAULT", |
| 157 | "UNKNOWN FAULT" |
| 158 | }; |
| 159 | |
| 160 | struct exynos_iommu_domain { |
| 161 | struct list_head clients; /* list of sysmmu_drvdata.node */ |
| 162 | unsigned long *pgtable; /* lv1 page table, 16KB */ |
| 163 | short *lv2entcnt; /* free lv2 entry counter for each section */ |
| 164 | spinlock_t lock; /* lock for this structure */ |
| 165 | spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */ |
| 166 | }; |
| 167 | |
| 168 | struct sysmmu_drvdata { |
| 169 | struct list_head node; /* entry of exynos_iommu_domain.clients */ |
| 170 | struct device *sysmmu; /* System MMU's device descriptor */ |
| 171 | struct device *dev; /* Owner of system MMU */ |
| 172 | char *dbgname; |
| 173 | int nsfrs; |
| 174 | void __iomem **sfrbases; |
| 175 | struct clk *clk[2]; |
| 176 | int activations; |
| 177 | rwlock_t lock; |
| 178 | struct iommu_domain *domain; |
| 179 | sysmmu_fault_handler_t fault_handler; |
| 180 | unsigned long pgtable; |
| 181 | }; |
| 182 | |
| 183 | static bool set_sysmmu_active(struct sysmmu_drvdata *data) |
| 184 | { |
| 185 | /* return true if the System MMU was not active previously |
| 186 | and it needs to be initialized */ |
| 187 | return ++data->activations == 1; |
| 188 | } |
| 189 | |
| 190 | static bool set_sysmmu_inactive(struct sysmmu_drvdata *data) |
| 191 | { |
| 192 | /* return true if the System MMU is needed to be disabled */ |
| 193 | BUG_ON(data->activations < 1); |
| 194 | return --data->activations == 0; |
| 195 | } |
| 196 | |
| 197 | static bool is_sysmmu_active(struct sysmmu_drvdata *data) |
| 198 | { |
| 199 | return data->activations > 0; |
| 200 | } |
| 201 | |
| 202 | static void sysmmu_unblock(void __iomem *sfrbase) |
| 203 | { |
| 204 | __raw_writel(CTRL_ENABLE, sfrbase + REG_MMU_CTRL); |
| 205 | } |
| 206 | |
| 207 | static bool sysmmu_block(void __iomem *sfrbase) |
| 208 | { |
| 209 | int i = 120; |
| 210 | |
| 211 | __raw_writel(CTRL_BLOCK, sfrbase + REG_MMU_CTRL); |
| 212 | while ((i > 0) && !(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) |
| 213 | --i; |
| 214 | |
| 215 | if (!(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) { |
| 216 | sysmmu_unblock(sfrbase); |
| 217 | return false; |
| 218 | } |
| 219 | |
| 220 | return true; |
| 221 | } |
| 222 | |
| 223 | static void __sysmmu_tlb_invalidate(void __iomem *sfrbase) |
| 224 | { |
| 225 | __raw_writel(0x1, sfrbase + REG_MMU_FLUSH); |
| 226 | } |
| 227 | |
| 228 | static void __sysmmu_tlb_invalidate_entry(void __iomem *sfrbase, |
| 229 | unsigned long iova) |
| 230 | { |
| 231 | __raw_writel((iova & SPAGE_MASK) | 1, sfrbase + REG_MMU_FLUSH_ENTRY); |
| 232 | } |
| 233 | |
| 234 | static void __sysmmu_set_ptbase(void __iomem *sfrbase, |
| 235 | unsigned long pgd) |
| 236 | { |
| 237 | __raw_writel(0x1, sfrbase + REG_MMU_CFG); /* 16KB LV1, LRU */ |
| 238 | __raw_writel(pgd, sfrbase + REG_PT_BASE_ADDR); |
| 239 | |
| 240 | __sysmmu_tlb_invalidate(sfrbase); |
| 241 | } |
| 242 | |
| 243 | static void __sysmmu_set_prefbuf(void __iomem *sfrbase, unsigned long base, |
| 244 | unsigned long size, int idx) |
| 245 | { |
| 246 | __raw_writel(base, sfrbase + REG_PB0_SADDR + idx * 8); |
| 247 | __raw_writel(size - 1 + base, sfrbase + REG_PB0_EADDR + idx * 8); |
| 248 | } |
| 249 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 250 | static void __set_fault_handler(struct sysmmu_drvdata *data, |
| 251 | sysmmu_fault_handler_t handler) |
| 252 | { |
| 253 | unsigned long flags; |
| 254 | |
| 255 | write_lock_irqsave(&data->lock, flags); |
| 256 | data->fault_handler = handler; |
| 257 | write_unlock_irqrestore(&data->lock, flags); |
| 258 | } |
| 259 | |
| 260 | void exynos_sysmmu_set_fault_handler(struct device *dev, |
| 261 | sysmmu_fault_handler_t handler) |
| 262 | { |
| 263 | struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); |
| 264 | |
| 265 | __set_fault_handler(data, handler); |
| 266 | } |
| 267 | |
| 268 | static int default_fault_handler(enum exynos_sysmmu_inttype itype, |
| 269 | unsigned long pgtable_base, unsigned long fault_addr) |
| 270 | { |
| 271 | unsigned long *ent; |
| 272 | |
| 273 | if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT)) |
| 274 | itype = SYSMMU_FAULT_UNKNOWN; |
| 275 | |
Masanari Iida | 07db040 | 2012-07-22 02:21:32 +0900 | [diff] [blame] | 276 | pr_err("%s occurred at 0x%lx(Page table base: 0x%lx)\n", |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 277 | sysmmu_fault_name[itype], fault_addr, pgtable_base); |
| 278 | |
| 279 | ent = section_entry(__va(pgtable_base), fault_addr); |
| 280 | pr_err("\tLv1 entry: 0x%lx\n", *ent); |
| 281 | |
| 282 | if (lv1ent_page(ent)) { |
| 283 | ent = page_entry(ent, fault_addr); |
| 284 | pr_err("\t Lv2 entry: 0x%lx\n", *ent); |
| 285 | } |
| 286 | |
| 287 | pr_err("Generating Kernel OOPS... because it is unrecoverable.\n"); |
| 288 | |
| 289 | BUG(); |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) |
| 295 | { |
| 296 | /* SYSMMU is in blocked when interrupt occurred. */ |
| 297 | struct sysmmu_drvdata *data = dev_id; |
| 298 | struct resource *irqres; |
| 299 | struct platform_device *pdev; |
| 300 | enum exynos_sysmmu_inttype itype; |
| 301 | unsigned long addr = -1; |
| 302 | |
| 303 | int i, ret = -ENOSYS; |
| 304 | |
| 305 | read_lock(&data->lock); |
| 306 | |
| 307 | WARN_ON(!is_sysmmu_active(data)); |
| 308 | |
| 309 | pdev = to_platform_device(data->sysmmu); |
| 310 | for (i = 0; i < (pdev->num_resources / 2); i++) { |
| 311 | irqres = platform_get_resource(pdev, IORESOURCE_IRQ, i); |
| 312 | if (irqres && ((int)irqres->start == irq)) |
| 313 | break; |
| 314 | } |
| 315 | |
| 316 | if (i == pdev->num_resources) { |
| 317 | itype = SYSMMU_FAULT_UNKNOWN; |
| 318 | } else { |
| 319 | itype = (enum exynos_sysmmu_inttype) |
| 320 | __ffs(__raw_readl(data->sfrbases[i] + REG_INT_STATUS)); |
| 321 | if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN)))) |
| 322 | itype = SYSMMU_FAULT_UNKNOWN; |
| 323 | else |
| 324 | addr = __raw_readl( |
| 325 | data->sfrbases[i] + fault_reg_offset[itype]); |
| 326 | } |
| 327 | |
| 328 | if (data->domain) |
| 329 | ret = report_iommu_fault(data->domain, data->dev, |
| 330 | addr, itype); |
| 331 | |
| 332 | if ((ret == -ENOSYS) && data->fault_handler) { |
| 333 | unsigned long base = data->pgtable; |
| 334 | if (itype != SYSMMU_FAULT_UNKNOWN) |
| 335 | base = __raw_readl( |
| 336 | data->sfrbases[i] + REG_PT_BASE_ADDR); |
| 337 | ret = data->fault_handler(itype, base, addr); |
| 338 | } |
| 339 | |
| 340 | if (!ret && (itype != SYSMMU_FAULT_UNKNOWN)) |
| 341 | __raw_writel(1 << itype, data->sfrbases[i] + REG_INT_CLEAR); |
| 342 | else |
| 343 | dev_dbg(data->sysmmu, "(%s) %s is not handled.\n", |
| 344 | data->dbgname, sysmmu_fault_name[itype]); |
| 345 | |
| 346 | if (itype != SYSMMU_FAULT_UNKNOWN) |
| 347 | sysmmu_unblock(data->sfrbases[i]); |
| 348 | |
| 349 | read_unlock(&data->lock); |
| 350 | |
| 351 | return IRQ_HANDLED; |
| 352 | } |
| 353 | |
| 354 | static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data) |
| 355 | { |
| 356 | unsigned long flags; |
| 357 | bool disabled = false; |
| 358 | int i; |
| 359 | |
| 360 | write_lock_irqsave(&data->lock, flags); |
| 361 | |
| 362 | if (!set_sysmmu_inactive(data)) |
| 363 | goto finish; |
| 364 | |
| 365 | for (i = 0; i < data->nsfrs; i++) |
| 366 | __raw_writel(CTRL_DISABLE, data->sfrbases[i] + REG_MMU_CTRL); |
| 367 | |
| 368 | if (data->clk[1]) |
| 369 | clk_disable(data->clk[1]); |
| 370 | if (data->clk[0]) |
| 371 | clk_disable(data->clk[0]); |
| 372 | |
| 373 | disabled = true; |
| 374 | data->pgtable = 0; |
| 375 | data->domain = NULL; |
| 376 | finish: |
| 377 | write_unlock_irqrestore(&data->lock, flags); |
| 378 | |
| 379 | if (disabled) |
| 380 | dev_dbg(data->sysmmu, "(%s) Disabled\n", data->dbgname); |
| 381 | else |
| 382 | dev_dbg(data->sysmmu, "(%s) %d times left to be disabled\n", |
| 383 | data->dbgname, data->activations); |
| 384 | |
| 385 | return disabled; |
| 386 | } |
| 387 | |
| 388 | /* __exynos_sysmmu_enable: Enables System MMU |
| 389 | * |
| 390 | * returns -error if an error occurred and System MMU is not enabled, |
| 391 | * 0 if the System MMU has been just enabled and 1 if System MMU was already |
| 392 | * enabled before. |
| 393 | */ |
| 394 | static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data, |
| 395 | unsigned long pgtable, struct iommu_domain *domain) |
| 396 | { |
| 397 | int i, ret = 0; |
| 398 | unsigned long flags; |
| 399 | |
| 400 | write_lock_irqsave(&data->lock, flags); |
| 401 | |
| 402 | if (!set_sysmmu_active(data)) { |
| 403 | if (WARN_ON(pgtable != data->pgtable)) { |
| 404 | ret = -EBUSY; |
| 405 | set_sysmmu_inactive(data); |
| 406 | } else { |
| 407 | ret = 1; |
| 408 | } |
| 409 | |
| 410 | dev_dbg(data->sysmmu, "(%s) Already enabled\n", data->dbgname); |
| 411 | goto finish; |
| 412 | } |
| 413 | |
| 414 | if (data->clk[0]) |
| 415 | clk_enable(data->clk[0]); |
| 416 | if (data->clk[1]) |
| 417 | clk_enable(data->clk[1]); |
| 418 | |
| 419 | data->pgtable = pgtable; |
| 420 | |
| 421 | for (i = 0; i < data->nsfrs; i++) { |
| 422 | __sysmmu_set_ptbase(data->sfrbases[i], pgtable); |
| 423 | |
| 424 | if ((readl(data->sfrbases[i] + REG_MMU_VERSION) >> 28) == 3) { |
| 425 | /* System MMU version is 3.x */ |
| 426 | __raw_writel((1 << 12) | (2 << 28), |
| 427 | data->sfrbases[i] + REG_MMU_CFG); |
| 428 | __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 0); |
| 429 | __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 1); |
| 430 | } |
| 431 | |
| 432 | __raw_writel(CTRL_ENABLE, data->sfrbases[i] + REG_MMU_CTRL); |
| 433 | } |
| 434 | |
| 435 | data->domain = domain; |
| 436 | |
| 437 | dev_dbg(data->sysmmu, "(%s) Enabled\n", data->dbgname); |
| 438 | finish: |
| 439 | write_unlock_irqrestore(&data->lock, flags); |
| 440 | |
| 441 | return ret; |
| 442 | } |
| 443 | |
| 444 | int exynos_sysmmu_enable(struct device *dev, unsigned long pgtable) |
| 445 | { |
| 446 | struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); |
| 447 | int ret; |
| 448 | |
| 449 | BUG_ON(!memblock_is_memory(pgtable)); |
| 450 | |
| 451 | ret = pm_runtime_get_sync(data->sysmmu); |
| 452 | if (ret < 0) { |
| 453 | dev_dbg(data->sysmmu, "(%s) Failed to enable\n", data->dbgname); |
| 454 | return ret; |
| 455 | } |
| 456 | |
| 457 | ret = __exynos_sysmmu_enable(data, pgtable, NULL); |
| 458 | if (WARN_ON(ret < 0)) { |
| 459 | pm_runtime_put(data->sysmmu); |
| 460 | dev_err(data->sysmmu, |
| 461 | "(%s) Already enabled with page table %#lx\n", |
| 462 | data->dbgname, data->pgtable); |
| 463 | } else { |
| 464 | data->dev = dev; |
| 465 | } |
| 466 | |
| 467 | return ret; |
| 468 | } |
| 469 | |
Sachin Kamat | 77e3835 | 2013-02-06 13:55:17 +0530 | [diff] [blame] | 470 | static bool exynos_sysmmu_disable(struct device *dev) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 471 | { |
| 472 | struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); |
| 473 | bool disabled; |
| 474 | |
| 475 | disabled = __exynos_sysmmu_disable(data); |
| 476 | pm_runtime_put(data->sysmmu); |
| 477 | |
| 478 | return disabled; |
| 479 | } |
| 480 | |
| 481 | static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova) |
| 482 | { |
| 483 | unsigned long flags; |
| 484 | struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); |
| 485 | |
| 486 | read_lock_irqsave(&data->lock, flags); |
| 487 | |
| 488 | if (is_sysmmu_active(data)) { |
| 489 | int i; |
| 490 | for (i = 0; i < data->nsfrs; i++) { |
| 491 | if (sysmmu_block(data->sfrbases[i])) { |
| 492 | __sysmmu_tlb_invalidate_entry( |
| 493 | data->sfrbases[i], iova); |
| 494 | sysmmu_unblock(data->sfrbases[i]); |
| 495 | } |
| 496 | } |
| 497 | } else { |
| 498 | dev_dbg(data->sysmmu, |
| 499 | "(%s) Disabled. Skipping invalidating TLB.\n", |
| 500 | data->dbgname); |
| 501 | } |
| 502 | |
| 503 | read_unlock_irqrestore(&data->lock, flags); |
| 504 | } |
| 505 | |
| 506 | void exynos_sysmmu_tlb_invalidate(struct device *dev) |
| 507 | { |
| 508 | unsigned long flags; |
| 509 | struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); |
| 510 | |
| 511 | read_lock_irqsave(&data->lock, flags); |
| 512 | |
| 513 | if (is_sysmmu_active(data)) { |
| 514 | int i; |
| 515 | for (i = 0; i < data->nsfrs; i++) { |
| 516 | if (sysmmu_block(data->sfrbases[i])) { |
| 517 | __sysmmu_tlb_invalidate(data->sfrbases[i]); |
| 518 | sysmmu_unblock(data->sfrbases[i]); |
| 519 | } |
| 520 | } |
| 521 | } else { |
| 522 | dev_dbg(data->sysmmu, |
| 523 | "(%s) Disabled. Skipping invalidating TLB.\n", |
| 524 | data->dbgname); |
| 525 | } |
| 526 | |
| 527 | read_unlock_irqrestore(&data->lock, flags); |
| 528 | } |
| 529 | |
| 530 | static int exynos_sysmmu_probe(struct platform_device *pdev) |
| 531 | { |
| 532 | int i, ret; |
| 533 | struct device *dev; |
| 534 | struct sysmmu_drvdata *data; |
| 535 | |
| 536 | dev = &pdev->dev; |
| 537 | |
| 538 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
| 539 | if (!data) { |
| 540 | dev_dbg(dev, "Not enough memory\n"); |
| 541 | ret = -ENOMEM; |
| 542 | goto err_alloc; |
| 543 | } |
| 544 | |
| 545 | ret = dev_set_drvdata(dev, data); |
| 546 | if (ret) { |
| 547 | dev_dbg(dev, "Unabled to initialize driver data\n"); |
| 548 | goto err_init; |
| 549 | } |
| 550 | |
| 551 | data->nsfrs = pdev->num_resources / 2; |
| 552 | data->sfrbases = kmalloc(sizeof(*data->sfrbases) * data->nsfrs, |
| 553 | GFP_KERNEL); |
| 554 | if (data->sfrbases == NULL) { |
| 555 | dev_dbg(dev, "Not enough memory\n"); |
| 556 | ret = -ENOMEM; |
| 557 | goto err_init; |
| 558 | } |
| 559 | |
| 560 | for (i = 0; i < data->nsfrs; i++) { |
| 561 | struct resource *res; |
| 562 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); |
| 563 | if (!res) { |
| 564 | dev_dbg(dev, "Unable to find IOMEM region\n"); |
| 565 | ret = -ENOENT; |
| 566 | goto err_res; |
| 567 | } |
| 568 | |
| 569 | data->sfrbases[i] = ioremap(res->start, resource_size(res)); |
| 570 | if (!data->sfrbases[i]) { |
| 571 | dev_dbg(dev, "Unable to map IOMEM @ PA:%#x\n", |
| 572 | res->start); |
| 573 | ret = -ENOENT; |
| 574 | goto err_res; |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | for (i = 0; i < data->nsfrs; i++) { |
| 579 | ret = platform_get_irq(pdev, i); |
| 580 | if (ret <= 0) { |
| 581 | dev_dbg(dev, "Unable to find IRQ resource\n"); |
| 582 | goto err_irq; |
| 583 | } |
| 584 | |
| 585 | ret = request_irq(ret, exynos_sysmmu_irq, 0, |
| 586 | dev_name(dev), data); |
| 587 | if (ret) { |
| 588 | dev_dbg(dev, "Unabled to register interrupt handler\n"); |
| 589 | goto err_irq; |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | if (dev_get_platdata(dev)) { |
| 594 | char *deli, *beg; |
| 595 | struct sysmmu_platform_data *platdata = dev_get_platdata(dev); |
| 596 | |
| 597 | beg = platdata->clockname; |
| 598 | |
| 599 | for (deli = beg; (*deli != '\0') && (*deli != ','); deli++) |
| 600 | /* NOTHING */; |
| 601 | |
| 602 | if (*deli == '\0') |
| 603 | deli = NULL; |
| 604 | else |
| 605 | *deli = '\0'; |
| 606 | |
| 607 | data->clk[0] = clk_get(dev, beg); |
| 608 | if (IS_ERR(data->clk[0])) { |
| 609 | data->clk[0] = NULL; |
| 610 | dev_dbg(dev, "No clock descriptor registered\n"); |
| 611 | } |
| 612 | |
| 613 | if (data->clk[0] && deli) { |
| 614 | *deli = ','; |
| 615 | data->clk[1] = clk_get(dev, deli + 1); |
| 616 | if (IS_ERR(data->clk[1])) |
| 617 | data->clk[1] = NULL; |
| 618 | } |
| 619 | |
| 620 | data->dbgname = platdata->dbgname; |
| 621 | } |
| 622 | |
| 623 | data->sysmmu = dev; |
| 624 | rwlock_init(&data->lock); |
| 625 | INIT_LIST_HEAD(&data->node); |
| 626 | |
| 627 | __set_fault_handler(data, &default_fault_handler); |
| 628 | |
| 629 | if (dev->parent) |
| 630 | pm_runtime_enable(dev); |
| 631 | |
| 632 | dev_dbg(dev, "(%s) Initialized\n", data->dbgname); |
| 633 | return 0; |
| 634 | err_irq: |
| 635 | while (i-- > 0) { |
| 636 | int irq; |
| 637 | |
| 638 | irq = platform_get_irq(pdev, i); |
| 639 | free_irq(irq, data); |
| 640 | } |
| 641 | err_res: |
| 642 | while (data->nsfrs-- > 0) |
| 643 | iounmap(data->sfrbases[data->nsfrs]); |
| 644 | kfree(data->sfrbases); |
| 645 | err_init: |
| 646 | kfree(data); |
| 647 | err_alloc: |
| 648 | dev_err(dev, "Failed to initialize\n"); |
| 649 | return ret; |
| 650 | } |
| 651 | |
| 652 | static struct platform_driver exynos_sysmmu_driver = { |
| 653 | .probe = exynos_sysmmu_probe, |
| 654 | .driver = { |
| 655 | .owner = THIS_MODULE, |
| 656 | .name = "exynos-sysmmu", |
| 657 | } |
| 658 | }; |
| 659 | |
| 660 | static inline void pgtable_flush(void *vastart, void *vaend) |
| 661 | { |
| 662 | dmac_flush_range(vastart, vaend); |
| 663 | outer_flush_range(virt_to_phys(vastart), |
| 664 | virt_to_phys(vaend)); |
| 665 | } |
| 666 | |
| 667 | static int exynos_iommu_domain_init(struct iommu_domain *domain) |
| 668 | { |
| 669 | struct exynos_iommu_domain *priv; |
| 670 | |
| 671 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 672 | if (!priv) |
| 673 | return -ENOMEM; |
| 674 | |
| 675 | priv->pgtable = (unsigned long *)__get_free_pages( |
| 676 | GFP_KERNEL | __GFP_ZERO, 2); |
| 677 | if (!priv->pgtable) |
| 678 | goto err_pgtable; |
| 679 | |
| 680 | priv->lv2entcnt = (short *)__get_free_pages( |
| 681 | GFP_KERNEL | __GFP_ZERO, 1); |
| 682 | if (!priv->lv2entcnt) |
| 683 | goto err_counter; |
| 684 | |
| 685 | pgtable_flush(priv->pgtable, priv->pgtable + NUM_LV1ENTRIES); |
| 686 | |
| 687 | spin_lock_init(&priv->lock); |
| 688 | spin_lock_init(&priv->pgtablelock); |
| 689 | INIT_LIST_HEAD(&priv->clients); |
| 690 | |
Sachin Kamat | eb51637 | 2012-08-01 14:35:17 +0530 | [diff] [blame] | 691 | domain->geometry.aperture_start = 0; |
| 692 | domain->geometry.aperture_end = ~0UL; |
| 693 | domain->geometry.force_aperture = true; |
Joerg Roedel | 3177bb7 | 2012-07-11 12:41:10 +0200 | [diff] [blame] | 694 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 695 | domain->priv = priv; |
| 696 | return 0; |
| 697 | |
| 698 | err_counter: |
| 699 | free_pages((unsigned long)priv->pgtable, 2); |
| 700 | err_pgtable: |
| 701 | kfree(priv); |
| 702 | return -ENOMEM; |
| 703 | } |
| 704 | |
| 705 | static void exynos_iommu_domain_destroy(struct iommu_domain *domain) |
| 706 | { |
| 707 | struct exynos_iommu_domain *priv = domain->priv; |
| 708 | struct sysmmu_drvdata *data; |
| 709 | unsigned long flags; |
| 710 | int i; |
| 711 | |
| 712 | WARN_ON(!list_empty(&priv->clients)); |
| 713 | |
| 714 | spin_lock_irqsave(&priv->lock, flags); |
| 715 | |
| 716 | list_for_each_entry(data, &priv->clients, node) { |
| 717 | while (!exynos_sysmmu_disable(data->dev)) |
| 718 | ; /* until System MMU is actually disabled */ |
| 719 | } |
| 720 | |
| 721 | spin_unlock_irqrestore(&priv->lock, flags); |
| 722 | |
| 723 | for (i = 0; i < NUM_LV1ENTRIES; i++) |
| 724 | if (lv1ent_page(priv->pgtable + i)) |
| 725 | kfree(__va(lv2table_base(priv->pgtable + i))); |
| 726 | |
| 727 | free_pages((unsigned long)priv->pgtable, 2); |
| 728 | free_pages((unsigned long)priv->lv2entcnt, 1); |
| 729 | kfree(domain->priv); |
| 730 | domain->priv = NULL; |
| 731 | } |
| 732 | |
| 733 | static int exynos_iommu_attach_device(struct iommu_domain *domain, |
| 734 | struct device *dev) |
| 735 | { |
| 736 | struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); |
| 737 | struct exynos_iommu_domain *priv = domain->priv; |
| 738 | unsigned long flags; |
| 739 | int ret; |
| 740 | |
| 741 | ret = pm_runtime_get_sync(data->sysmmu); |
| 742 | if (ret < 0) |
| 743 | return ret; |
| 744 | |
| 745 | ret = 0; |
| 746 | |
| 747 | spin_lock_irqsave(&priv->lock, flags); |
| 748 | |
| 749 | ret = __exynos_sysmmu_enable(data, __pa(priv->pgtable), domain); |
| 750 | |
| 751 | if (ret == 0) { |
| 752 | /* 'data->node' must not be appeared in priv->clients */ |
| 753 | BUG_ON(!list_empty(&data->node)); |
| 754 | data->dev = dev; |
| 755 | list_add_tail(&data->node, &priv->clients); |
| 756 | } |
| 757 | |
| 758 | spin_unlock_irqrestore(&priv->lock, flags); |
| 759 | |
| 760 | if (ret < 0) { |
| 761 | dev_err(dev, "%s: Failed to attach IOMMU with pgtable %#lx\n", |
| 762 | __func__, __pa(priv->pgtable)); |
| 763 | pm_runtime_put(data->sysmmu); |
| 764 | } else if (ret > 0) { |
| 765 | dev_dbg(dev, "%s: IOMMU with pgtable 0x%lx already attached\n", |
| 766 | __func__, __pa(priv->pgtable)); |
| 767 | } else { |
| 768 | dev_dbg(dev, "%s: Attached new IOMMU with pgtable 0x%lx\n", |
| 769 | __func__, __pa(priv->pgtable)); |
| 770 | } |
| 771 | |
| 772 | return ret; |
| 773 | } |
| 774 | |
| 775 | static void exynos_iommu_detach_device(struct iommu_domain *domain, |
| 776 | struct device *dev) |
| 777 | { |
| 778 | struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu); |
| 779 | struct exynos_iommu_domain *priv = domain->priv; |
| 780 | struct list_head *pos; |
| 781 | unsigned long flags; |
| 782 | bool found = false; |
| 783 | |
| 784 | spin_lock_irqsave(&priv->lock, flags); |
| 785 | |
| 786 | list_for_each(pos, &priv->clients) { |
| 787 | if (list_entry(pos, struct sysmmu_drvdata, node) == data) { |
| 788 | found = true; |
| 789 | break; |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | if (!found) |
| 794 | goto finish; |
| 795 | |
| 796 | if (__exynos_sysmmu_disable(data)) { |
| 797 | dev_dbg(dev, "%s: Detached IOMMU with pgtable %#lx\n", |
| 798 | __func__, __pa(priv->pgtable)); |
Wei Yongjun | f8ffcc9 | 2012-09-06 12:34:09 +0800 | [diff] [blame] | 799 | list_del_init(&data->node); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 800 | |
| 801 | } else { |
| 802 | dev_dbg(dev, "%s: Detaching IOMMU with pgtable %#lx delayed", |
| 803 | __func__, __pa(priv->pgtable)); |
| 804 | } |
| 805 | |
| 806 | finish: |
| 807 | spin_unlock_irqrestore(&priv->lock, flags); |
| 808 | |
| 809 | if (found) |
| 810 | pm_runtime_put(data->sysmmu); |
| 811 | } |
| 812 | |
| 813 | static unsigned long *alloc_lv2entry(unsigned long *sent, unsigned long iova, |
| 814 | short *pgcounter) |
| 815 | { |
| 816 | if (lv1ent_fault(sent)) { |
| 817 | unsigned long *pent; |
| 818 | |
| 819 | pent = kzalloc(LV2TABLE_SIZE, GFP_ATOMIC); |
| 820 | BUG_ON((unsigned long)pent & (LV2TABLE_SIZE - 1)); |
| 821 | if (!pent) |
| 822 | return NULL; |
| 823 | |
| 824 | *sent = mk_lv1ent_page(__pa(pent)); |
| 825 | *pgcounter = NUM_LV2ENTRIES; |
| 826 | pgtable_flush(pent, pent + NUM_LV2ENTRIES); |
| 827 | pgtable_flush(sent, sent + 1); |
| 828 | } |
| 829 | |
| 830 | return page_entry(sent, iova); |
| 831 | } |
| 832 | |
| 833 | static int lv1set_section(unsigned long *sent, phys_addr_t paddr, short *pgcnt) |
| 834 | { |
| 835 | if (lv1ent_section(sent)) |
| 836 | return -EADDRINUSE; |
| 837 | |
| 838 | if (lv1ent_page(sent)) { |
| 839 | if (*pgcnt != NUM_LV2ENTRIES) |
| 840 | return -EADDRINUSE; |
| 841 | |
| 842 | kfree(page_entry(sent, 0)); |
| 843 | |
| 844 | *pgcnt = 0; |
| 845 | } |
| 846 | |
| 847 | *sent = mk_lv1ent_sect(paddr); |
| 848 | |
| 849 | pgtable_flush(sent, sent + 1); |
| 850 | |
| 851 | return 0; |
| 852 | } |
| 853 | |
| 854 | static int lv2set_page(unsigned long *pent, phys_addr_t paddr, size_t size, |
| 855 | short *pgcnt) |
| 856 | { |
| 857 | if (size == SPAGE_SIZE) { |
| 858 | if (!lv2ent_fault(pent)) |
| 859 | return -EADDRINUSE; |
| 860 | |
| 861 | *pent = mk_lv2ent_spage(paddr); |
| 862 | pgtable_flush(pent, pent + 1); |
| 863 | *pgcnt -= 1; |
| 864 | } else { /* size == LPAGE_SIZE */ |
| 865 | int i; |
| 866 | for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) { |
| 867 | if (!lv2ent_fault(pent)) { |
| 868 | memset(pent, 0, sizeof(*pent) * i); |
| 869 | return -EADDRINUSE; |
| 870 | } |
| 871 | |
| 872 | *pent = mk_lv2ent_lpage(paddr); |
| 873 | } |
| 874 | pgtable_flush(pent - SPAGES_PER_LPAGE, pent); |
| 875 | *pgcnt -= SPAGES_PER_LPAGE; |
| 876 | } |
| 877 | |
| 878 | return 0; |
| 879 | } |
| 880 | |
| 881 | static int exynos_iommu_map(struct iommu_domain *domain, unsigned long iova, |
| 882 | phys_addr_t paddr, size_t size, int prot) |
| 883 | { |
| 884 | struct exynos_iommu_domain *priv = domain->priv; |
| 885 | unsigned long *entry; |
| 886 | unsigned long flags; |
| 887 | int ret = -ENOMEM; |
| 888 | |
| 889 | BUG_ON(priv->pgtable == NULL); |
| 890 | |
| 891 | spin_lock_irqsave(&priv->pgtablelock, flags); |
| 892 | |
| 893 | entry = section_entry(priv->pgtable, iova); |
| 894 | |
| 895 | if (size == SECT_SIZE) { |
| 896 | ret = lv1set_section(entry, paddr, |
| 897 | &priv->lv2entcnt[lv1ent_offset(iova)]); |
| 898 | } else { |
| 899 | unsigned long *pent; |
| 900 | |
| 901 | pent = alloc_lv2entry(entry, iova, |
| 902 | &priv->lv2entcnt[lv1ent_offset(iova)]); |
| 903 | |
| 904 | if (!pent) |
| 905 | ret = -ENOMEM; |
| 906 | else |
| 907 | ret = lv2set_page(pent, paddr, size, |
| 908 | &priv->lv2entcnt[lv1ent_offset(iova)]); |
| 909 | } |
| 910 | |
| 911 | if (ret) { |
| 912 | pr_debug("%s: Failed to map iova 0x%lx/0x%x bytes\n", |
| 913 | __func__, iova, size); |
| 914 | } |
| 915 | |
| 916 | spin_unlock_irqrestore(&priv->pgtablelock, flags); |
| 917 | |
| 918 | return ret; |
| 919 | } |
| 920 | |
| 921 | static size_t exynos_iommu_unmap(struct iommu_domain *domain, |
| 922 | unsigned long iova, size_t size) |
| 923 | { |
| 924 | struct exynos_iommu_domain *priv = domain->priv; |
| 925 | struct sysmmu_drvdata *data; |
| 926 | unsigned long flags; |
| 927 | unsigned long *ent; |
| 928 | |
| 929 | BUG_ON(priv->pgtable == NULL); |
| 930 | |
| 931 | spin_lock_irqsave(&priv->pgtablelock, flags); |
| 932 | |
| 933 | ent = section_entry(priv->pgtable, iova); |
| 934 | |
| 935 | if (lv1ent_section(ent)) { |
| 936 | BUG_ON(size < SECT_SIZE); |
| 937 | |
| 938 | *ent = 0; |
| 939 | pgtable_flush(ent, ent + 1); |
| 940 | size = SECT_SIZE; |
| 941 | goto done; |
| 942 | } |
| 943 | |
| 944 | if (unlikely(lv1ent_fault(ent))) { |
| 945 | if (size > SECT_SIZE) |
| 946 | size = SECT_SIZE; |
| 947 | goto done; |
| 948 | } |
| 949 | |
| 950 | /* lv1ent_page(sent) == true here */ |
| 951 | |
| 952 | ent = page_entry(ent, iova); |
| 953 | |
| 954 | if (unlikely(lv2ent_fault(ent))) { |
| 955 | size = SPAGE_SIZE; |
| 956 | goto done; |
| 957 | } |
| 958 | |
| 959 | if (lv2ent_small(ent)) { |
| 960 | *ent = 0; |
| 961 | size = SPAGE_SIZE; |
| 962 | priv->lv2entcnt[lv1ent_offset(iova)] += 1; |
| 963 | goto done; |
| 964 | } |
| 965 | |
| 966 | /* lv1ent_large(ent) == true here */ |
| 967 | BUG_ON(size < LPAGE_SIZE); |
| 968 | |
| 969 | memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE); |
| 970 | |
| 971 | size = LPAGE_SIZE; |
| 972 | priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; |
| 973 | done: |
| 974 | spin_unlock_irqrestore(&priv->pgtablelock, flags); |
| 975 | |
| 976 | spin_lock_irqsave(&priv->lock, flags); |
| 977 | list_for_each_entry(data, &priv->clients, node) |
| 978 | sysmmu_tlb_invalidate_entry(data->dev, iova); |
| 979 | spin_unlock_irqrestore(&priv->lock, flags); |
| 980 | |
| 981 | |
| 982 | return size; |
| 983 | } |
| 984 | |
| 985 | static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain, |
Varun Sethi | bb5547a | 2013-03-29 01:23:58 +0530 | [diff] [blame] | 986 | dma_addr_t iova) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 987 | { |
| 988 | struct exynos_iommu_domain *priv = domain->priv; |
| 989 | unsigned long *entry; |
| 990 | unsigned long flags; |
| 991 | phys_addr_t phys = 0; |
| 992 | |
| 993 | spin_lock_irqsave(&priv->pgtablelock, flags); |
| 994 | |
| 995 | entry = section_entry(priv->pgtable, iova); |
| 996 | |
| 997 | if (lv1ent_section(entry)) { |
| 998 | phys = section_phys(entry) + section_offs(iova); |
| 999 | } else if (lv1ent_page(entry)) { |
| 1000 | entry = page_entry(entry, iova); |
| 1001 | |
| 1002 | if (lv2ent_large(entry)) |
| 1003 | phys = lpage_phys(entry) + lpage_offs(iova); |
| 1004 | else if (lv2ent_small(entry)) |
| 1005 | phys = spage_phys(entry) + spage_offs(iova); |
| 1006 | } |
| 1007 | |
| 1008 | spin_unlock_irqrestore(&priv->pgtablelock, flags); |
| 1009 | |
| 1010 | return phys; |
| 1011 | } |
| 1012 | |
| 1013 | static struct iommu_ops exynos_iommu_ops = { |
| 1014 | .domain_init = &exynos_iommu_domain_init, |
| 1015 | .domain_destroy = &exynos_iommu_domain_destroy, |
| 1016 | .attach_dev = &exynos_iommu_attach_device, |
| 1017 | .detach_dev = &exynos_iommu_detach_device, |
| 1018 | .map = &exynos_iommu_map, |
| 1019 | .unmap = &exynos_iommu_unmap, |
| 1020 | .iova_to_phys = &exynos_iommu_iova_to_phys, |
| 1021 | .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE, |
| 1022 | }; |
| 1023 | |
| 1024 | static int __init exynos_iommu_init(void) |
| 1025 | { |
| 1026 | int ret; |
| 1027 | |
| 1028 | ret = platform_driver_register(&exynos_sysmmu_driver); |
| 1029 | |
| 1030 | if (ret == 0) |
| 1031 | bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); |
| 1032 | |
| 1033 | return ret; |
| 1034 | } |
| 1035 | subsys_initcall(exynos_iommu_init); |