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 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 15 | #include <linux/clk.h> |
| 16 | #include <linux/err.h> |
Marek Szyprowski | 312900c | 2015-05-19 15:20:30 +0200 | [diff] [blame] | 17 | #include <linux/io.h> |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 18 | #include <linux/iommu.h> |
Marek Szyprowski | 312900c | 2015-05-19 15:20:30 +0200 | [diff] [blame] | 19 | #include <linux/interrupt.h> |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 20 | #include <linux/list.h> |
Marek Szyprowski | 312900c | 2015-05-19 15:20:30 +0200 | [diff] [blame] | 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/pm_runtime.h> |
| 23 | #include <linux/slab.h> |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 24 | |
| 25 | #include <asm/cacheflush.h> |
| 26 | #include <asm/pgtable.h> |
| 27 | |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 28 | typedef u32 sysmmu_iova_t; |
| 29 | typedef u32 sysmmu_pte_t; |
| 30 | |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 31 | /* We do not consider super section mapping (16MB) */ |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 32 | #define SECT_ORDER 20 |
| 33 | #define LPAGE_ORDER 16 |
| 34 | #define SPAGE_ORDER 12 |
| 35 | |
| 36 | #define SECT_SIZE (1 << SECT_ORDER) |
| 37 | #define LPAGE_SIZE (1 << LPAGE_ORDER) |
| 38 | #define SPAGE_SIZE (1 << SPAGE_ORDER) |
| 39 | |
| 40 | #define SECT_MASK (~(SECT_SIZE - 1)) |
| 41 | #define LPAGE_MASK (~(LPAGE_SIZE - 1)) |
| 42 | #define SPAGE_MASK (~(SPAGE_SIZE - 1)) |
| 43 | |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 44 | #define lv1ent_fault(sent) ((*(sent) == ZERO_LV2LINK) || \ |
| 45 | ((*(sent) & 3) == 0) || ((*(sent) & 3) == 3)) |
| 46 | #define lv1ent_zero(sent) (*(sent) == ZERO_LV2LINK) |
| 47 | #define lv1ent_page_zero(sent) ((*(sent) & 3) == 1) |
| 48 | #define lv1ent_page(sent) ((*(sent) != ZERO_LV2LINK) && \ |
| 49 | ((*(sent) & 3) == 1)) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 50 | #define lv1ent_section(sent) ((*(sent) & 3) == 2) |
| 51 | |
| 52 | #define lv2ent_fault(pent) ((*(pent) & 3) == 0) |
| 53 | #define lv2ent_small(pent) ((*(pent) & 2) == 2) |
| 54 | #define lv2ent_large(pent) ((*(pent) & 3) == 1) |
| 55 | |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 56 | static u32 sysmmu_page_offset(sysmmu_iova_t iova, u32 size) |
| 57 | { |
| 58 | return iova & (size - 1); |
| 59 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 60 | |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 61 | #define section_phys(sent) (*(sent) & SECT_MASK) |
| 62 | #define section_offs(iova) sysmmu_page_offset((iova), SECT_SIZE) |
| 63 | #define lpage_phys(pent) (*(pent) & LPAGE_MASK) |
| 64 | #define lpage_offs(iova) sysmmu_page_offset((iova), LPAGE_SIZE) |
| 65 | #define spage_phys(pent) (*(pent) & SPAGE_MASK) |
| 66 | #define spage_offs(iova) sysmmu_page_offset((iova), SPAGE_SIZE) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 67 | |
| 68 | #define NUM_LV1ENTRIES 4096 |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 69 | #define NUM_LV2ENTRIES (SECT_SIZE / SPAGE_SIZE) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 70 | |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 71 | static u32 lv1ent_offset(sysmmu_iova_t iova) |
| 72 | { |
| 73 | return iova >> SECT_ORDER; |
| 74 | } |
| 75 | |
| 76 | static u32 lv2ent_offset(sysmmu_iova_t iova) |
| 77 | { |
| 78 | return (iova >> SPAGE_ORDER) & (NUM_LV2ENTRIES - 1); |
| 79 | } |
| 80 | |
| 81 | #define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(sysmmu_pte_t)) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 82 | |
| 83 | #define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE) |
| 84 | |
| 85 | #define lv2table_base(sent) (*(sent) & 0xFFFFFC00) |
| 86 | |
| 87 | #define mk_lv1ent_sect(pa) ((pa) | 2) |
| 88 | #define mk_lv1ent_page(pa) ((pa) | 1) |
| 89 | #define mk_lv2ent_lpage(pa) ((pa) | 1) |
| 90 | #define mk_lv2ent_spage(pa) ((pa) | 2) |
| 91 | |
| 92 | #define CTRL_ENABLE 0x5 |
| 93 | #define CTRL_BLOCK 0x7 |
| 94 | #define CTRL_DISABLE 0x0 |
| 95 | |
Cho KyongHo | eeb5184 | 2014-05-12 11:45:03 +0530 | [diff] [blame] | 96 | #define CFG_LRU 0x1 |
| 97 | #define CFG_QOS(n) ((n & 0xF) << 7) |
| 98 | #define CFG_MASK 0x0150FFFF /* Selecting bit 0-15, 20, 22 and 24 */ |
| 99 | #define CFG_ACGEN (1 << 24) /* System MMU 3.3 only */ |
| 100 | #define CFG_SYSSEL (1 << 22) /* System MMU 3.2 only */ |
| 101 | #define CFG_FLPDCACHE (1 << 20) /* System MMU 3.2+ only */ |
| 102 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 103 | #define REG_MMU_CTRL 0x000 |
| 104 | #define REG_MMU_CFG 0x004 |
| 105 | #define REG_MMU_STATUS 0x008 |
| 106 | #define REG_MMU_FLUSH 0x00C |
| 107 | #define REG_MMU_FLUSH_ENTRY 0x010 |
| 108 | #define REG_PT_BASE_ADDR 0x014 |
| 109 | #define REG_INT_STATUS 0x018 |
| 110 | #define REG_INT_CLEAR 0x01C |
| 111 | |
| 112 | #define REG_PAGE_FAULT_ADDR 0x024 |
| 113 | #define REG_AW_FAULT_ADDR 0x028 |
| 114 | #define REG_AR_FAULT_ADDR 0x02C |
| 115 | #define REG_DEFAULT_SLAVE_ADDR 0x030 |
| 116 | |
| 117 | #define REG_MMU_VERSION 0x034 |
| 118 | |
Cho KyongHo | eeb5184 | 2014-05-12 11:45:03 +0530 | [diff] [blame] | 119 | #define MMU_MAJ_VER(val) ((val) >> 7) |
| 120 | #define MMU_MIN_VER(val) ((val) & 0x7F) |
| 121 | #define MMU_RAW_VER(reg) (((reg) >> 21) & ((1 << 11) - 1)) /* 11 bits */ |
| 122 | |
| 123 | #define MAKE_MMU_VER(maj, min) ((((maj) & 0xF) << 7) | ((min) & 0x7F)) |
| 124 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 125 | #define REG_PB0_SADDR 0x04C |
| 126 | #define REG_PB0_EADDR 0x050 |
| 127 | #define REG_PB1_SADDR 0x054 |
| 128 | #define REG_PB1_EADDR 0x058 |
| 129 | |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 130 | #define has_sysmmu(dev) (dev->archdata.iommu != NULL) |
| 131 | |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 132 | static struct kmem_cache *lv2table_kmem_cache; |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 133 | static sysmmu_pte_t *zero_lv2_table; |
| 134 | #define ZERO_LV2LINK mk_lv1ent_page(virt_to_phys(zero_lv2_table)) |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 135 | |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 136 | static sysmmu_pte_t *section_entry(sysmmu_pte_t *pgtable, sysmmu_iova_t iova) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 137 | { |
| 138 | return pgtable + lv1ent_offset(iova); |
| 139 | } |
| 140 | |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 141 | static sysmmu_pte_t *page_entry(sysmmu_pte_t *sent, sysmmu_iova_t iova) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 142 | { |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 143 | return (sysmmu_pte_t *)phys_to_virt( |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 144 | lv2table_base(sent)) + lv2ent_offset(iova); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | enum exynos_sysmmu_inttype { |
| 148 | SYSMMU_PAGEFAULT, |
| 149 | SYSMMU_AR_MULTIHIT, |
| 150 | SYSMMU_AW_MULTIHIT, |
| 151 | SYSMMU_BUSERROR, |
| 152 | SYSMMU_AR_SECURITY, |
| 153 | SYSMMU_AR_ACCESS, |
| 154 | SYSMMU_AW_SECURITY, |
| 155 | SYSMMU_AW_PROTECTION, /* 7 */ |
| 156 | SYSMMU_FAULT_UNKNOWN, |
| 157 | SYSMMU_FAULTS_NUM |
| 158 | }; |
| 159 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 160 | static unsigned short fault_reg_offset[SYSMMU_FAULTS_NUM] = { |
| 161 | REG_PAGE_FAULT_ADDR, |
| 162 | REG_AR_FAULT_ADDR, |
| 163 | REG_AW_FAULT_ADDR, |
| 164 | REG_DEFAULT_SLAVE_ADDR, |
| 165 | REG_AR_FAULT_ADDR, |
| 166 | REG_AR_FAULT_ADDR, |
| 167 | REG_AW_FAULT_ADDR, |
| 168 | REG_AW_FAULT_ADDR |
| 169 | }; |
| 170 | |
| 171 | static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = { |
| 172 | "PAGE FAULT", |
| 173 | "AR MULTI-HIT FAULT", |
| 174 | "AW MULTI-HIT FAULT", |
| 175 | "BUS ERROR", |
| 176 | "AR SECURITY PROTECTION FAULT", |
| 177 | "AR ACCESS PROTECTION FAULT", |
| 178 | "AW SECURITY PROTECTION FAULT", |
| 179 | "AW ACCESS PROTECTION FAULT", |
| 180 | "UNKNOWN FAULT" |
| 181 | }; |
| 182 | |
Marek Szyprowski | 2860af3 | 2015-05-19 15:20:31 +0200 | [diff] [blame] | 183 | /* |
| 184 | * This structure is attached to dev.archdata.iommu of the master device |
| 185 | * on device add, contains a list of SYSMMU controllers defined by device tree, |
| 186 | * which are bound to given master device. It is usually referenced by 'owner' |
| 187 | * pointer. |
| 188 | */ |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 189 | struct exynos_iommu_owner { |
Marek Szyprowski | 1b09205 | 2015-05-19 15:20:33 +0200 | [diff] [blame] | 190 | struct list_head controllers; /* list of sysmmu_drvdata.owner_node */ |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 191 | }; |
| 192 | |
Marek Szyprowski | 2860af3 | 2015-05-19 15:20:31 +0200 | [diff] [blame] | 193 | /* |
| 194 | * This structure exynos specific generalization of struct iommu_domain. |
| 195 | * It contains list of SYSMMU controllers from all master devices, which has |
| 196 | * been attached to this domain and page tables of IO address space defined by |
| 197 | * it. It is usually referenced by 'domain' pointer. |
| 198 | */ |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 199 | struct exynos_iommu_domain { |
Marek Szyprowski | 2860af3 | 2015-05-19 15:20:31 +0200 | [diff] [blame] | 200 | struct list_head clients; /* list of sysmmu_drvdata.domain_node */ |
| 201 | sysmmu_pte_t *pgtable; /* lv1 page table, 16KB */ |
| 202 | short *lv2entcnt; /* free lv2 entry counter for each section */ |
| 203 | spinlock_t lock; /* lock for modyfying list of clients */ |
| 204 | spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */ |
Joerg Roedel | e1fd1ea | 2015-03-26 13:43:11 +0100 | [diff] [blame] | 205 | struct iommu_domain domain; /* generic domain data structure */ |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 206 | }; |
| 207 | |
Marek Szyprowski | 2860af3 | 2015-05-19 15:20:31 +0200 | [diff] [blame] | 208 | /* |
| 209 | * This structure hold all data of a single SYSMMU controller, this includes |
| 210 | * hw resources like registers and clocks, pointers and list nodes to connect |
| 211 | * it to all other structures, internal state and parameters read from device |
| 212 | * tree. It is usually referenced by 'data' pointer. |
| 213 | */ |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 214 | struct sysmmu_drvdata { |
Marek Szyprowski | 2860af3 | 2015-05-19 15:20:31 +0200 | [diff] [blame] | 215 | struct device *sysmmu; /* SYSMMU controller device */ |
| 216 | struct device *master; /* master device (owner) */ |
| 217 | void __iomem *sfrbase; /* our registers */ |
| 218 | struct clk *clk; /* SYSMMU's clock */ |
| 219 | struct clk *clk_master; /* master's device clock */ |
| 220 | int activations; /* number of calls to sysmmu_enable */ |
| 221 | spinlock_t lock; /* lock for modyfying state */ |
| 222 | struct exynos_iommu_domain *domain; /* domain we belong to */ |
| 223 | struct list_head domain_node; /* node for domain clients list */ |
Marek Szyprowski | 1b09205 | 2015-05-19 15:20:33 +0200 | [diff] [blame] | 224 | struct list_head owner_node; /* node for owner controllers list */ |
Marek Szyprowski | 2860af3 | 2015-05-19 15:20:31 +0200 | [diff] [blame] | 225 | phys_addr_t pgtable; /* assigned page table structure */ |
| 226 | unsigned int version; /* our version */ |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 227 | }; |
| 228 | |
Joerg Roedel | e1fd1ea | 2015-03-26 13:43:11 +0100 | [diff] [blame] | 229 | static struct exynos_iommu_domain *to_exynos_domain(struct iommu_domain *dom) |
| 230 | { |
| 231 | return container_of(dom, struct exynos_iommu_domain, domain); |
| 232 | } |
| 233 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 234 | static bool set_sysmmu_active(struct sysmmu_drvdata *data) |
| 235 | { |
| 236 | /* return true if the System MMU was not active previously |
| 237 | and it needs to be initialized */ |
| 238 | return ++data->activations == 1; |
| 239 | } |
| 240 | |
| 241 | static bool set_sysmmu_inactive(struct sysmmu_drvdata *data) |
| 242 | { |
| 243 | /* return true if the System MMU is needed to be disabled */ |
| 244 | BUG_ON(data->activations < 1); |
| 245 | return --data->activations == 0; |
| 246 | } |
| 247 | |
| 248 | static bool is_sysmmu_active(struct sysmmu_drvdata *data) |
| 249 | { |
| 250 | return data->activations > 0; |
| 251 | } |
| 252 | |
| 253 | static void sysmmu_unblock(void __iomem *sfrbase) |
| 254 | { |
| 255 | __raw_writel(CTRL_ENABLE, sfrbase + REG_MMU_CTRL); |
| 256 | } |
| 257 | |
| 258 | static bool sysmmu_block(void __iomem *sfrbase) |
| 259 | { |
| 260 | int i = 120; |
| 261 | |
| 262 | __raw_writel(CTRL_BLOCK, sfrbase + REG_MMU_CTRL); |
| 263 | while ((i > 0) && !(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) |
| 264 | --i; |
| 265 | |
| 266 | if (!(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) { |
| 267 | sysmmu_unblock(sfrbase); |
| 268 | return false; |
| 269 | } |
| 270 | |
| 271 | return true; |
| 272 | } |
| 273 | |
| 274 | static void __sysmmu_tlb_invalidate(void __iomem *sfrbase) |
| 275 | { |
| 276 | __raw_writel(0x1, sfrbase + REG_MMU_FLUSH); |
| 277 | } |
| 278 | |
| 279 | static void __sysmmu_tlb_invalidate_entry(void __iomem *sfrbase, |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 280 | sysmmu_iova_t iova, unsigned int num_inv) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 281 | { |
Cho KyongHo | 3ad6b7f | 2014-05-12 11:44:49 +0530 | [diff] [blame] | 282 | unsigned int i; |
Sachin Kamat | 365409d | 2014-05-22 09:50:56 +0530 | [diff] [blame] | 283 | |
Cho KyongHo | 3ad6b7f | 2014-05-12 11:44:49 +0530 | [diff] [blame] | 284 | for (i = 0; i < num_inv; i++) { |
| 285 | __raw_writel((iova & SPAGE_MASK) | 1, |
| 286 | sfrbase + REG_MMU_FLUSH_ENTRY); |
| 287 | iova += SPAGE_SIZE; |
| 288 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | static void __sysmmu_set_ptbase(void __iomem *sfrbase, |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 292 | phys_addr_t pgd) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 293 | { |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 294 | __raw_writel(pgd, sfrbase + REG_PT_BASE_ADDR); |
| 295 | |
| 296 | __sysmmu_tlb_invalidate(sfrbase); |
| 297 | } |
| 298 | |
Cho KyongHo | 1fab7fa | 2014-05-12 11:44:56 +0530 | [diff] [blame] | 299 | static void show_fault_information(const char *name, |
| 300 | enum exynos_sysmmu_inttype itype, |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 301 | phys_addr_t pgtable_base, sysmmu_iova_t fault_addr) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 302 | { |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 303 | sysmmu_pte_t *ent; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 304 | |
| 305 | if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT)) |
| 306 | itype = SYSMMU_FAULT_UNKNOWN; |
| 307 | |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 308 | pr_err("%s occurred at %#x by %s(Page table base: %pa)\n", |
Cho KyongHo | 1fab7fa | 2014-05-12 11:44:56 +0530 | [diff] [blame] | 309 | sysmmu_fault_name[itype], fault_addr, name, &pgtable_base); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 310 | |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 311 | ent = section_entry(phys_to_virt(pgtable_base), fault_addr); |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 312 | pr_err("\tLv1 entry: %#x\n", *ent); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 313 | |
| 314 | if (lv1ent_page(ent)) { |
| 315 | ent = page_entry(ent, fault_addr); |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 316 | pr_err("\t Lv2 entry: %#x\n", *ent); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 317 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) |
| 321 | { |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 322 | /* SYSMMU is in blocked state when interrupt occurred. */ |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 323 | struct sysmmu_drvdata *data = dev_id; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 324 | enum exynos_sysmmu_inttype itype; |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 325 | sysmmu_iova_t addr = -1; |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 326 | int ret = -ENOSYS; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 327 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 328 | WARN_ON(!is_sysmmu_active(data)); |
| 329 | |
Cho KyongHo | 9d4e7a2 | 2014-05-12 11:44:57 +0530 | [diff] [blame] | 330 | spin_lock(&data->lock); |
| 331 | |
Cho KyongHo | 7060587 | 2014-05-12 11:44:55 +0530 | [diff] [blame] | 332 | if (!IS_ERR(data->clk_master)) |
| 333 | clk_enable(data->clk_master); |
Cho KyongHo | 9d4e7a2 | 2014-05-12 11:44:57 +0530 | [diff] [blame] | 334 | |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 335 | itype = (enum exynos_sysmmu_inttype) |
| 336 | __ffs(__raw_readl(data->sfrbase + REG_INT_STATUS)); |
| 337 | if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN)))) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 338 | itype = SYSMMU_FAULT_UNKNOWN; |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 339 | else |
| 340 | addr = __raw_readl(data->sfrbase + fault_reg_offset[itype]); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 341 | |
Cho KyongHo | 1fab7fa | 2014-05-12 11:44:56 +0530 | [diff] [blame] | 342 | if (itype == SYSMMU_FAULT_UNKNOWN) { |
| 343 | pr_err("%s: Fault is not occurred by System MMU '%s'!\n", |
| 344 | __func__, dev_name(data->sysmmu)); |
| 345 | pr_err("%s: Please check if IRQ is correctly configured.\n", |
| 346 | __func__); |
| 347 | BUG(); |
| 348 | } else { |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 349 | unsigned int base = |
Cho KyongHo | 1fab7fa | 2014-05-12 11:44:56 +0530 | [diff] [blame] | 350 | __raw_readl(data->sfrbase + REG_PT_BASE_ADDR); |
| 351 | show_fault_information(dev_name(data->sysmmu), |
| 352 | itype, base, addr); |
| 353 | if (data->domain) |
Marek Szyprowski | a9133b99 | 2015-05-19 15:20:29 +0200 | [diff] [blame] | 354 | ret = report_iommu_fault(&data->domain->domain, |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 355 | data->master, addr, itype); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 356 | } |
| 357 | |
Cho KyongHo | 1fab7fa | 2014-05-12 11:44:56 +0530 | [diff] [blame] | 358 | /* fault is not recovered by fault handler */ |
| 359 | BUG_ON(ret != 0); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 360 | |
Cho KyongHo | 1fab7fa | 2014-05-12 11:44:56 +0530 | [diff] [blame] | 361 | __raw_writel(1 << itype, data->sfrbase + REG_INT_CLEAR); |
| 362 | |
| 363 | sysmmu_unblock(data->sfrbase); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 364 | |
Cho KyongHo | 7060587 | 2014-05-12 11:44:55 +0530 | [diff] [blame] | 365 | if (!IS_ERR(data->clk_master)) |
| 366 | clk_disable(data->clk_master); |
| 367 | |
Cho KyongHo | 9d4e7a2 | 2014-05-12 11:44:57 +0530 | [diff] [blame] | 368 | spin_unlock(&data->lock); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 369 | |
| 370 | return IRQ_HANDLED; |
| 371 | } |
| 372 | |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 373 | static void __sysmmu_disable_nocount(struct sysmmu_drvdata *data) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 374 | { |
Cho KyongHo | 7060587 | 2014-05-12 11:44:55 +0530 | [diff] [blame] | 375 | if (!IS_ERR(data->clk_master)) |
| 376 | clk_enable(data->clk_master); |
| 377 | |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 378 | __raw_writel(CTRL_DISABLE, data->sfrbase + REG_MMU_CTRL); |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 379 | __raw_writel(0, data->sfrbase + REG_MMU_CFG); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 380 | |
Cho KyongHo | 46c16d1 | 2014-05-12 11:44:54 +0530 | [diff] [blame] | 381 | clk_disable(data->clk); |
Cho KyongHo | 7060587 | 2014-05-12 11:44:55 +0530 | [diff] [blame] | 382 | if (!IS_ERR(data->clk_master)) |
| 383 | clk_disable(data->clk_master); |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 384 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 385 | |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 386 | static bool __sysmmu_disable(struct sysmmu_drvdata *data) |
| 387 | { |
| 388 | bool disabled; |
| 389 | unsigned long flags; |
| 390 | |
| 391 | spin_lock_irqsave(&data->lock, flags); |
| 392 | |
| 393 | disabled = set_sysmmu_inactive(data); |
| 394 | |
| 395 | if (disabled) { |
| 396 | data->pgtable = 0; |
| 397 | data->domain = NULL; |
| 398 | |
| 399 | __sysmmu_disable_nocount(data); |
| 400 | |
| 401 | dev_dbg(data->sysmmu, "Disabled\n"); |
| 402 | } else { |
| 403 | dev_dbg(data->sysmmu, "%d times left to disable\n", |
| 404 | data->activations); |
| 405 | } |
| 406 | |
Cho KyongHo | 9d4e7a2 | 2014-05-12 11:44:57 +0530 | [diff] [blame] | 407 | spin_unlock_irqrestore(&data->lock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 408 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 409 | return disabled; |
| 410 | } |
| 411 | |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 412 | static void __sysmmu_init_config(struct sysmmu_drvdata *data) |
| 413 | { |
Cho KyongHo | eeb5184 | 2014-05-12 11:45:03 +0530 | [diff] [blame] | 414 | unsigned int cfg = CFG_LRU | CFG_QOS(15); |
| 415 | unsigned int ver; |
| 416 | |
Marek Szyprowski | 512bd0c | 2015-05-19 15:20:24 +0200 | [diff] [blame] | 417 | ver = MMU_RAW_VER(__raw_readl(data->sfrbase + REG_MMU_VERSION)); |
Cho KyongHo | eeb5184 | 2014-05-12 11:45:03 +0530 | [diff] [blame] | 418 | if (MMU_MAJ_VER(ver) == 3) { |
| 419 | if (MMU_MIN_VER(ver) >= 2) { |
| 420 | cfg |= CFG_FLPDCACHE; |
| 421 | if (MMU_MIN_VER(ver) == 3) { |
| 422 | cfg |= CFG_ACGEN; |
| 423 | cfg &= ~CFG_LRU; |
| 424 | } else { |
| 425 | cfg |= CFG_SYSSEL; |
| 426 | } |
| 427 | } |
| 428 | } |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 429 | |
| 430 | __raw_writel(cfg, data->sfrbase + REG_MMU_CFG); |
Marek Szyprowski | 512bd0c | 2015-05-19 15:20:24 +0200 | [diff] [blame] | 431 | data->version = ver; |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | static void __sysmmu_enable_nocount(struct sysmmu_drvdata *data) |
| 435 | { |
| 436 | if (!IS_ERR(data->clk_master)) |
| 437 | clk_enable(data->clk_master); |
| 438 | clk_enable(data->clk); |
| 439 | |
| 440 | __raw_writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL); |
| 441 | |
| 442 | __sysmmu_init_config(data); |
| 443 | |
| 444 | __sysmmu_set_ptbase(data->sfrbase, data->pgtable); |
| 445 | |
| 446 | __raw_writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL); |
| 447 | |
| 448 | if (!IS_ERR(data->clk_master)) |
| 449 | clk_disable(data->clk_master); |
| 450 | } |
| 451 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 452 | static int __sysmmu_enable(struct sysmmu_drvdata *data, phys_addr_t pgtable, |
Marek Szyprowski | a9133b99 | 2015-05-19 15:20:29 +0200 | [diff] [blame] | 453 | struct exynos_iommu_domain *domain) |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 454 | { |
| 455 | int ret = 0; |
| 456 | unsigned long flags; |
| 457 | |
| 458 | spin_lock_irqsave(&data->lock, flags); |
| 459 | if (set_sysmmu_active(data)) { |
| 460 | data->pgtable = pgtable; |
Marek Szyprowski | a9133b99 | 2015-05-19 15:20:29 +0200 | [diff] [blame] | 461 | data->domain = domain; |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 462 | |
| 463 | __sysmmu_enable_nocount(data); |
| 464 | |
| 465 | dev_dbg(data->sysmmu, "Enabled\n"); |
| 466 | } else { |
| 467 | ret = (pgtable == data->pgtable) ? 1 : -EBUSY; |
| 468 | |
| 469 | dev_dbg(data->sysmmu, "already enabled\n"); |
| 470 | } |
| 471 | |
| 472 | if (WARN_ON(ret < 0)) |
| 473 | set_sysmmu_inactive(data); /* decrement count */ |
| 474 | |
| 475 | spin_unlock_irqrestore(&data->lock, flags); |
| 476 | |
| 477 | return ret; |
| 478 | } |
| 479 | |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 480 | static void __sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, |
| 481 | sysmmu_iova_t iova) |
| 482 | { |
Marek Szyprowski | 512bd0c | 2015-05-19 15:20:24 +0200 | [diff] [blame] | 483 | if (data->version == MAKE_MMU_VER(3, 3)) |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 484 | __raw_writel(iova | 0x1, data->sfrbase + REG_MMU_FLUSH_ENTRY); |
| 485 | } |
| 486 | |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 487 | static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 488 | sysmmu_iova_t iova) |
| 489 | { |
| 490 | unsigned long flags; |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 491 | |
| 492 | if (!IS_ERR(data->clk_master)) |
| 493 | clk_enable(data->clk_master); |
| 494 | |
| 495 | spin_lock_irqsave(&data->lock, flags); |
| 496 | if (is_sysmmu_active(data)) |
| 497 | __sysmmu_tlb_invalidate_flpdcache(data, iova); |
| 498 | spin_unlock_irqrestore(&data->lock, flags); |
| 499 | |
| 500 | if (!IS_ERR(data->clk_master)) |
| 501 | clk_disable(data->clk_master); |
| 502 | } |
| 503 | |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 504 | static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data, |
| 505 | sysmmu_iova_t iova, size_t size) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 506 | { |
| 507 | unsigned long flags; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 508 | |
Cho KyongHo | 9d4e7a2 | 2014-05-12 11:44:57 +0530 | [diff] [blame] | 509 | spin_lock_irqsave(&data->lock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 510 | if (is_sysmmu_active(data)) { |
Cho KyongHo | 3ad6b7f | 2014-05-12 11:44:49 +0530 | [diff] [blame] | 511 | unsigned int num_inv = 1; |
Cho KyongHo | 7060587 | 2014-05-12 11:44:55 +0530 | [diff] [blame] | 512 | |
| 513 | if (!IS_ERR(data->clk_master)) |
| 514 | clk_enable(data->clk_master); |
| 515 | |
Cho KyongHo | 3ad6b7f | 2014-05-12 11:44:49 +0530 | [diff] [blame] | 516 | /* |
| 517 | * L2TLB invalidation required |
| 518 | * 4KB page: 1 invalidation |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 519 | * 64KB page: 16 invalidations |
| 520 | * 1MB page: 64 invalidations |
Cho KyongHo | 3ad6b7f | 2014-05-12 11:44:49 +0530 | [diff] [blame] | 521 | * because it is set-associative TLB |
| 522 | * with 8-way and 64 sets. |
| 523 | * 1MB page can be cached in one of all sets. |
| 524 | * 64KB page can be one of 16 consecutive sets. |
| 525 | */ |
Marek Szyprowski | 512bd0c | 2015-05-19 15:20:24 +0200 | [diff] [blame] | 526 | if (MMU_MAJ_VER(data->version) == 2) |
Cho KyongHo | 3ad6b7f | 2014-05-12 11:44:49 +0530 | [diff] [blame] | 527 | num_inv = min_t(unsigned int, size / PAGE_SIZE, 64); |
| 528 | |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 529 | if (sysmmu_block(data->sfrbase)) { |
| 530 | __sysmmu_tlb_invalidate_entry( |
Cho KyongHo | 3ad6b7f | 2014-05-12 11:44:49 +0530 | [diff] [blame] | 531 | data->sfrbase, iova, num_inv); |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 532 | sysmmu_unblock(data->sfrbase); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 533 | } |
Cho KyongHo | 7060587 | 2014-05-12 11:44:55 +0530 | [diff] [blame] | 534 | if (!IS_ERR(data->clk_master)) |
| 535 | clk_disable(data->clk_master); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 536 | } else { |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 537 | dev_dbg(data->master, |
| 538 | "disabled. Skipping TLB invalidation @ %#x\n", iova); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 539 | } |
Cho KyongHo | 9d4e7a2 | 2014-05-12 11:44:57 +0530 | [diff] [blame] | 540 | spin_unlock_irqrestore(&data->lock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 541 | } |
| 542 | |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 543 | static int __init exynos_sysmmu_probe(struct platform_device *pdev) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 544 | { |
Cho KyongHo | 46c16d1 | 2014-05-12 11:44:54 +0530 | [diff] [blame] | 545 | int irq, ret; |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 546 | struct device *dev = &pdev->dev; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 547 | struct sysmmu_drvdata *data; |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 548 | struct resource *res; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 549 | |
Cho KyongHo | 46c16d1 | 2014-05-12 11:44:54 +0530 | [diff] [blame] | 550 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
| 551 | if (!data) |
| 552 | return -ENOMEM; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 553 | |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 554 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Cho KyongHo | 46c16d1 | 2014-05-12 11:44:54 +0530 | [diff] [blame] | 555 | data->sfrbase = devm_ioremap_resource(dev, res); |
| 556 | if (IS_ERR(data->sfrbase)) |
| 557 | return PTR_ERR(data->sfrbase); |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 558 | |
Cho KyongHo | 46c16d1 | 2014-05-12 11:44:54 +0530 | [diff] [blame] | 559 | irq = platform_get_irq(pdev, 0); |
| 560 | if (irq <= 0) { |
Cho KyongHo | 0bf4e54 | 2014-05-12 11:45:00 +0530 | [diff] [blame] | 561 | dev_err(dev, "Unable to find IRQ resource\n"); |
Cho KyongHo | 46c16d1 | 2014-05-12 11:44:54 +0530 | [diff] [blame] | 562 | return irq; |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 563 | } |
| 564 | |
Cho KyongHo | 46c16d1 | 2014-05-12 11:44:54 +0530 | [diff] [blame] | 565 | ret = devm_request_irq(dev, irq, exynos_sysmmu_irq, 0, |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 566 | dev_name(dev), data); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 567 | if (ret) { |
Cho KyongHo | 46c16d1 | 2014-05-12 11:44:54 +0530 | [diff] [blame] | 568 | dev_err(dev, "Unabled to register handler of irq %d\n", irq); |
| 569 | return ret; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 570 | } |
| 571 | |
Cho KyongHo | 46c16d1 | 2014-05-12 11:44:54 +0530 | [diff] [blame] | 572 | data->clk = devm_clk_get(dev, "sysmmu"); |
| 573 | if (IS_ERR(data->clk)) { |
| 574 | dev_err(dev, "Failed to get clock!\n"); |
| 575 | return PTR_ERR(data->clk); |
| 576 | } else { |
| 577 | ret = clk_prepare(data->clk); |
| 578 | if (ret) { |
| 579 | dev_err(dev, "Failed to prepare clk\n"); |
| 580 | return ret; |
| 581 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 582 | } |
| 583 | |
Cho KyongHo | 7060587 | 2014-05-12 11:44:55 +0530 | [diff] [blame] | 584 | data->clk_master = devm_clk_get(dev, "master"); |
| 585 | if (!IS_ERR(data->clk_master)) { |
| 586 | ret = clk_prepare(data->clk_master); |
| 587 | if (ret) { |
| 588 | clk_unprepare(data->clk); |
| 589 | dev_err(dev, "Failed to prepare master's clk\n"); |
| 590 | return ret; |
| 591 | } |
| 592 | } |
| 593 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 594 | data->sysmmu = dev; |
Cho KyongHo | 9d4e7a2 | 2014-05-12 11:44:57 +0530 | [diff] [blame] | 595 | spin_lock_init(&data->lock); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 596 | |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 597 | platform_set_drvdata(pdev, data); |
| 598 | |
Cho KyongHo | f4723ec | 2014-05-12 11:44:52 +0530 | [diff] [blame] | 599 | pm_runtime_enable(dev); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 600 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 601 | return 0; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 602 | } |
| 603 | |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 604 | static const struct of_device_id sysmmu_of_match[] __initconst = { |
| 605 | { .compatible = "samsung,exynos-sysmmu", }, |
| 606 | { }, |
| 607 | }; |
| 608 | |
| 609 | static struct platform_driver exynos_sysmmu_driver __refdata = { |
| 610 | .probe = exynos_sysmmu_probe, |
| 611 | .driver = { |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 612 | .name = "exynos-sysmmu", |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 613 | .of_match_table = sysmmu_of_match, |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 614 | } |
| 615 | }; |
| 616 | |
| 617 | static inline void pgtable_flush(void *vastart, void *vaend) |
| 618 | { |
| 619 | dmac_flush_range(vastart, vaend); |
| 620 | outer_flush_range(virt_to_phys(vastart), |
| 621 | virt_to_phys(vaend)); |
| 622 | } |
| 623 | |
Joerg Roedel | e1fd1ea | 2015-03-26 13:43:11 +0100 | [diff] [blame] | 624 | static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 625 | { |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 626 | struct exynos_iommu_domain *domain; |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 627 | int i; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 628 | |
Joerg Roedel | e1fd1ea | 2015-03-26 13:43:11 +0100 | [diff] [blame] | 629 | if (type != IOMMU_DOMAIN_UNMANAGED) |
| 630 | return NULL; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 631 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 632 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
| 633 | if (!domain) |
Joerg Roedel | e1fd1ea | 2015-03-26 13:43:11 +0100 | [diff] [blame] | 634 | return NULL; |
| 635 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 636 | domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2); |
| 637 | if (!domain->pgtable) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 638 | goto err_pgtable; |
| 639 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 640 | domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1); |
| 641 | if (!domain->lv2entcnt) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 642 | goto err_counter; |
| 643 | |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 644 | /* Workaround for System MMU v3.3 to prevent caching 1MiB mapping */ |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 645 | for (i = 0; i < NUM_LV1ENTRIES; i += 8) { |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 646 | domain->pgtable[i + 0] = ZERO_LV2LINK; |
| 647 | domain->pgtable[i + 1] = ZERO_LV2LINK; |
| 648 | domain->pgtable[i + 2] = ZERO_LV2LINK; |
| 649 | domain->pgtable[i + 3] = ZERO_LV2LINK; |
| 650 | domain->pgtable[i + 4] = ZERO_LV2LINK; |
| 651 | domain->pgtable[i + 5] = ZERO_LV2LINK; |
| 652 | domain->pgtable[i + 6] = ZERO_LV2LINK; |
| 653 | domain->pgtable[i + 7] = ZERO_LV2LINK; |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 654 | } |
| 655 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 656 | pgtable_flush(domain->pgtable, domain->pgtable + NUM_LV1ENTRIES); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 657 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 658 | spin_lock_init(&domain->lock); |
| 659 | spin_lock_init(&domain->pgtablelock); |
| 660 | INIT_LIST_HEAD(&domain->clients); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 661 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 662 | domain->domain.geometry.aperture_start = 0; |
| 663 | domain->domain.geometry.aperture_end = ~0UL; |
| 664 | domain->domain.geometry.force_aperture = true; |
Joerg Roedel | 3177bb7 | 2012-07-11 12:41:10 +0200 | [diff] [blame] | 665 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 666 | return &domain->domain; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 667 | |
| 668 | err_counter: |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 669 | free_pages((unsigned long)domain->pgtable, 2); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 670 | err_pgtable: |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 671 | kfree(domain); |
Joerg Roedel | e1fd1ea | 2015-03-26 13:43:11 +0100 | [diff] [blame] | 672 | return NULL; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 673 | } |
| 674 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 675 | static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 676 | { |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 677 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 678 | struct sysmmu_drvdata *data, *next; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 679 | unsigned long flags; |
| 680 | int i; |
| 681 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 682 | WARN_ON(!list_empty(&domain->clients)); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 683 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 684 | spin_lock_irqsave(&domain->lock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 685 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 686 | list_for_each_entry_safe(data, next, &domain->clients, domain_node) { |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 687 | if (__sysmmu_disable(data)) |
| 688 | data->master = NULL; |
| 689 | list_del_init(&data->domain_node); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 690 | } |
| 691 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 692 | spin_unlock_irqrestore(&domain->lock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 693 | |
| 694 | for (i = 0; i < NUM_LV1ENTRIES; i++) |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 695 | if (lv1ent_page(domain->pgtable + i)) |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 696 | kmem_cache_free(lv2table_kmem_cache, |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 697 | phys_to_virt(lv2table_base(domain->pgtable + i))); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 698 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 699 | free_pages((unsigned long)domain->pgtable, 2); |
| 700 | free_pages((unsigned long)domain->lv2entcnt, 1); |
| 701 | kfree(domain); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 702 | } |
| 703 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 704 | static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 705 | struct device *dev) |
| 706 | { |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 707 | struct exynos_iommu_owner *owner = dev->archdata.iommu; |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 708 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 709 | struct sysmmu_drvdata *data; |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 710 | phys_addr_t pagetable = virt_to_phys(domain->pgtable); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 711 | unsigned long flags; |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 712 | int ret = -ENODEV; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 713 | |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 714 | if (!has_sysmmu(dev)) |
| 715 | return -ENODEV; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 716 | |
Marek Szyprowski | 1b09205 | 2015-05-19 15:20:33 +0200 | [diff] [blame] | 717 | list_for_each_entry(data, &owner->controllers, owner_node) { |
Marek Szyprowski | ce70ca5 | 2015-05-19 15:20:34 +0200 | [diff] [blame^] | 718 | pm_runtime_get_sync(data->sysmmu); |
Marek Szyprowski | a9133b99 | 2015-05-19 15:20:29 +0200 | [diff] [blame] | 719 | ret = __sysmmu_enable(data, pagetable, domain); |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 720 | if (ret >= 0) { |
| 721 | data->master = dev; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 722 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 723 | spin_lock_irqsave(&domain->lock, flags); |
| 724 | list_add_tail(&data->domain_node, &domain->clients); |
| 725 | spin_unlock_irqrestore(&domain->lock, flags); |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 726 | } |
| 727 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 728 | |
| 729 | if (ret < 0) { |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 730 | dev_err(dev, "%s: Failed to attach IOMMU with pgtable %pa\n", |
| 731 | __func__, &pagetable); |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 732 | return ret; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 733 | } |
| 734 | |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 735 | dev_dbg(dev, "%s: Attached IOMMU with pgtable %pa %s\n", |
| 736 | __func__, &pagetable, (ret == 0) ? "" : ", again"); |
| 737 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 738 | return ret; |
| 739 | } |
| 740 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 741 | static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain, |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 742 | struct device *dev) |
| 743 | { |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 744 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
| 745 | phys_addr_t pagetable = virt_to_phys(domain->pgtable); |
Marek Szyprowski | 1b09205 | 2015-05-19 15:20:33 +0200 | [diff] [blame] | 746 | struct sysmmu_drvdata *data, *next; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 747 | unsigned long flags; |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 748 | bool found = false; |
| 749 | |
| 750 | if (!has_sysmmu(dev)) |
| 751 | return; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 752 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 753 | spin_lock_irqsave(&domain->lock, flags); |
Marek Szyprowski | 1b09205 | 2015-05-19 15:20:33 +0200 | [diff] [blame] | 754 | list_for_each_entry_safe(data, next, &domain->clients, domain_node) { |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 755 | if (data->master == dev) { |
| 756 | if (__sysmmu_disable(data)) { |
| 757 | data->master = NULL; |
| 758 | list_del_init(&data->domain_node); |
| 759 | } |
Marek Szyprowski | ce70ca5 | 2015-05-19 15:20:34 +0200 | [diff] [blame^] | 760 | pm_runtime_put(data->sysmmu); |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 761 | found = true; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 762 | } |
| 763 | } |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 764 | spin_unlock_irqrestore(&domain->lock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 765 | |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 766 | if (found) |
Cho KyongHo | 6b21a5d | 2014-05-12 11:45:02 +0530 | [diff] [blame] | 767 | dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", |
| 768 | __func__, &pagetable); |
| 769 | else |
| 770 | dev_err(dev, "%s: No IOMMU is attached\n", __func__); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 771 | } |
| 772 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 773 | static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *domain, |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 774 | sysmmu_pte_t *sent, sysmmu_iova_t iova, short *pgcounter) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 775 | { |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 776 | if (lv1ent_section(sent)) { |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 777 | WARN(1, "Trying mapping on %#08x mapped with 1MiB page", iova); |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 778 | return ERR_PTR(-EADDRINUSE); |
| 779 | } |
| 780 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 781 | if (lv1ent_fault(sent)) { |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 782 | sysmmu_pte_t *pent; |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 783 | bool need_flush_flpd_cache = lv1ent_zero(sent); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 784 | |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 785 | pent = kmem_cache_zalloc(lv2table_kmem_cache, GFP_ATOMIC); |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 786 | BUG_ON((unsigned int)pent & (LV2TABLE_SIZE - 1)); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 787 | if (!pent) |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 788 | return ERR_PTR(-ENOMEM); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 789 | |
Cho KyongHo | 7222e8d | 2014-05-12 11:44:46 +0530 | [diff] [blame] | 790 | *sent = mk_lv1ent_page(virt_to_phys(pent)); |
Colin Cross | dc3814f | 2015-05-08 17:05:44 -0700 | [diff] [blame] | 791 | kmemleak_ignore(pent); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 792 | *pgcounter = NUM_LV2ENTRIES; |
| 793 | pgtable_flush(pent, pent + NUM_LV2ENTRIES); |
| 794 | pgtable_flush(sent, sent + 1); |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 795 | |
| 796 | /* |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 797 | * If pre-fetched SLPD is a faulty SLPD in zero_l2_table, |
| 798 | * FLPD cache may cache the address of zero_l2_table. This |
| 799 | * function replaces the zero_l2_table with new L2 page table |
| 800 | * to write valid mappings. |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 801 | * Accessing the valid area may cause page fault since FLPD |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 802 | * cache may still cache zero_l2_table for the valid area |
| 803 | * instead of new L2 page table that has the mapping |
| 804 | * information of the valid area. |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 805 | * Thus any replacement of zero_l2_table with other valid L2 |
| 806 | * page table must involve FLPD cache invalidation for System |
| 807 | * MMU v3.3. |
| 808 | * FLPD cache invalidation is performed with TLB invalidation |
| 809 | * by VPN without blocking. It is safe to invalidate TLB without |
| 810 | * blocking because the target address of TLB invalidation is |
| 811 | * not currently mapped. |
| 812 | */ |
| 813 | if (need_flush_flpd_cache) { |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 814 | struct sysmmu_drvdata *data; |
Sachin Kamat | 365409d | 2014-05-22 09:50:56 +0530 | [diff] [blame] | 815 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 816 | spin_lock(&domain->lock); |
| 817 | list_for_each_entry(data, &domain->clients, domain_node) |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 818 | sysmmu_tlb_invalidate_flpdcache(data, iova); |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 819 | spin_unlock(&domain->lock); |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 820 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 821 | } |
| 822 | |
| 823 | return page_entry(sent, iova); |
| 824 | } |
| 825 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 826 | static int lv1set_section(struct exynos_iommu_domain *domain, |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 827 | sysmmu_pte_t *sent, sysmmu_iova_t iova, |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 828 | phys_addr_t paddr, short *pgcnt) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 829 | { |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 830 | if (lv1ent_section(sent)) { |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 831 | WARN(1, "Trying mapping on 1MiB@%#08x that is mapped", |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 832 | iova); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 833 | return -EADDRINUSE; |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 834 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 835 | |
| 836 | if (lv1ent_page(sent)) { |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 837 | if (*pgcnt != NUM_LV2ENTRIES) { |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 838 | WARN(1, "Trying mapping on 1MiB@%#08x that is mapped", |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 839 | iova); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 840 | return -EADDRINUSE; |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 841 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 842 | |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 843 | kmem_cache_free(lv2table_kmem_cache, page_entry(sent, 0)); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 844 | *pgcnt = 0; |
| 845 | } |
| 846 | |
| 847 | *sent = mk_lv1ent_sect(paddr); |
| 848 | |
| 849 | pgtable_flush(sent, sent + 1); |
| 850 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 851 | spin_lock(&domain->lock); |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 852 | if (lv1ent_page_zero(sent)) { |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 853 | struct sysmmu_drvdata *data; |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 854 | /* |
| 855 | * Flushing FLPD cache in System MMU v3.3 that may cache a FLPD |
| 856 | * entry by speculative prefetch of SLPD which has no mapping. |
| 857 | */ |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 858 | list_for_each_entry(data, &domain->clients, domain_node) |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 859 | sysmmu_tlb_invalidate_flpdcache(data, iova); |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 860 | } |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 861 | spin_unlock(&domain->lock); |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 862 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 863 | return 0; |
| 864 | } |
| 865 | |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 866 | static int lv2set_page(sysmmu_pte_t *pent, phys_addr_t paddr, size_t size, |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 867 | short *pgcnt) |
| 868 | { |
| 869 | if (size == SPAGE_SIZE) { |
Cho KyongHo | 0bf4e54 | 2014-05-12 11:45:00 +0530 | [diff] [blame] | 870 | if (WARN_ON(!lv2ent_fault(pent))) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 871 | return -EADDRINUSE; |
| 872 | |
| 873 | *pent = mk_lv2ent_spage(paddr); |
| 874 | pgtable_flush(pent, pent + 1); |
| 875 | *pgcnt -= 1; |
| 876 | } else { /* size == LPAGE_SIZE */ |
| 877 | int i; |
Sachin Kamat | 365409d | 2014-05-22 09:50:56 +0530 | [diff] [blame] | 878 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 879 | for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) { |
Cho KyongHo | 0bf4e54 | 2014-05-12 11:45:00 +0530 | [diff] [blame] | 880 | if (WARN_ON(!lv2ent_fault(pent))) { |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 881 | if (i > 0) |
| 882 | memset(pent - i, 0, sizeof(*pent) * i); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 883 | return -EADDRINUSE; |
| 884 | } |
| 885 | |
| 886 | *pent = mk_lv2ent_lpage(paddr); |
| 887 | } |
| 888 | pgtable_flush(pent - SPAGES_PER_LPAGE, pent); |
| 889 | *pgcnt -= SPAGES_PER_LPAGE; |
| 890 | } |
| 891 | |
| 892 | return 0; |
| 893 | } |
| 894 | |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 895 | /* |
| 896 | * *CAUTION* to the I/O virtual memory managers that support exynos-iommu: |
| 897 | * |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 898 | * System MMU v3.x has advanced logic to improve address translation |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 899 | * performance with caching more page table entries by a page table walk. |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 900 | * However, the logic has a bug that while caching faulty page table entries, |
| 901 | * System MMU reports page fault if the cached fault entry is hit even though |
| 902 | * the fault entry is updated to a valid entry after the entry is cached. |
| 903 | * To prevent caching faulty page table entries which may be updated to valid |
| 904 | * entries later, the virtual memory manager should care about the workaround |
| 905 | * for the problem. The following describes the workaround. |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 906 | * |
| 907 | * Any two consecutive I/O virtual address regions must have a hole of 128KiB |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 908 | * at maximum to prevent misbehavior of System MMU 3.x (workaround for h/w bug). |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 909 | * |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 910 | * Precisely, any start address of I/O virtual region must be aligned with |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 911 | * the following sizes for System MMU v3.1 and v3.2. |
| 912 | * System MMU v3.1: 128KiB |
| 913 | * System MMU v3.2: 256KiB |
| 914 | * |
| 915 | * Because System MMU v3.3 caches page table entries more aggressively, it needs |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 916 | * more workarounds. |
| 917 | * - Any two consecutive I/O virtual regions must have a hole of size larger |
| 918 | * than or equal to 128KiB. |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 919 | * - Start address of an I/O virtual region must be aligned by 128KiB. |
| 920 | */ |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 921 | static int exynos_iommu_map(struct iommu_domain *iommu_domain, |
| 922 | unsigned long l_iova, phys_addr_t paddr, size_t size, |
| 923 | int prot) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 924 | { |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 925 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 926 | sysmmu_pte_t *entry; |
| 927 | sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 928 | unsigned long flags; |
| 929 | int ret = -ENOMEM; |
| 930 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 931 | BUG_ON(domain->pgtable == NULL); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 932 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 933 | spin_lock_irqsave(&domain->pgtablelock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 934 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 935 | entry = section_entry(domain->pgtable, iova); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 936 | |
| 937 | if (size == SECT_SIZE) { |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 938 | ret = lv1set_section(domain, entry, iova, paddr, |
| 939 | &domain->lv2entcnt[lv1ent_offset(iova)]); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 940 | } else { |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 941 | sysmmu_pte_t *pent; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 942 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 943 | pent = alloc_lv2entry(domain, entry, iova, |
| 944 | &domain->lv2entcnt[lv1ent_offset(iova)]); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 945 | |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 946 | if (IS_ERR(pent)) |
| 947 | ret = PTR_ERR(pent); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 948 | else |
| 949 | ret = lv2set_page(pent, paddr, size, |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 950 | &domain->lv2entcnt[lv1ent_offset(iova)]); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 951 | } |
| 952 | |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 953 | if (ret) |
Cho KyongHo | 0bf4e54 | 2014-05-12 11:45:00 +0530 | [diff] [blame] | 954 | pr_err("%s: Failed(%d) to map %#zx bytes @ %#x\n", |
| 955 | __func__, ret, size, iova); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 956 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 957 | spin_unlock_irqrestore(&domain->pgtablelock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 958 | |
| 959 | return ret; |
| 960 | } |
| 961 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 962 | static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *domain, |
| 963 | sysmmu_iova_t iova, size_t size) |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 964 | { |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 965 | struct sysmmu_drvdata *data; |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 966 | unsigned long flags; |
| 967 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 968 | spin_lock_irqsave(&domain->lock, flags); |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 969 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 970 | list_for_each_entry(data, &domain->clients, domain_node) |
Marek Szyprowski | 469aceb | 2015-05-19 15:20:27 +0200 | [diff] [blame] | 971 | sysmmu_tlb_invalidate_entry(data, iova, size); |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 972 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 973 | spin_unlock_irqrestore(&domain->lock, flags); |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 974 | } |
| 975 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 976 | static size_t exynos_iommu_unmap(struct iommu_domain *iommu_domain, |
| 977 | unsigned long l_iova, size_t size) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 978 | { |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 979 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 980 | sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; |
| 981 | sysmmu_pte_t *ent; |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 982 | size_t err_pgsize; |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 983 | unsigned long flags; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 984 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 985 | BUG_ON(domain->pgtable == NULL); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 986 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 987 | spin_lock_irqsave(&domain->pgtablelock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 988 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 989 | ent = section_entry(domain->pgtable, iova); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 990 | |
| 991 | if (lv1ent_section(ent)) { |
Cho KyongHo | 0bf4e54 | 2014-05-12 11:45:00 +0530 | [diff] [blame] | 992 | if (WARN_ON(size < SECT_SIZE)) { |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 993 | err_pgsize = SECT_SIZE; |
| 994 | goto err; |
| 995 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 996 | |
Sachin Kamat | f171aba | 2014-08-04 10:06:28 +0530 | [diff] [blame] | 997 | /* workaround for h/w bug in System MMU v3.3 */ |
| 998 | *ent = ZERO_LV2LINK; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 999 | pgtable_flush(ent, ent + 1); |
| 1000 | size = SECT_SIZE; |
| 1001 | goto done; |
| 1002 | } |
| 1003 | |
| 1004 | if (unlikely(lv1ent_fault(ent))) { |
| 1005 | if (size > SECT_SIZE) |
| 1006 | size = SECT_SIZE; |
| 1007 | goto done; |
| 1008 | } |
| 1009 | |
| 1010 | /* lv1ent_page(sent) == true here */ |
| 1011 | |
| 1012 | ent = page_entry(ent, iova); |
| 1013 | |
| 1014 | if (unlikely(lv2ent_fault(ent))) { |
| 1015 | size = SPAGE_SIZE; |
| 1016 | goto done; |
| 1017 | } |
| 1018 | |
| 1019 | if (lv2ent_small(ent)) { |
| 1020 | *ent = 0; |
| 1021 | size = SPAGE_SIZE; |
Cho KyongHo | 6cb47ed | 2014-05-12 11:44:51 +0530 | [diff] [blame] | 1022 | pgtable_flush(ent, ent + 1); |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1023 | domain->lv2entcnt[lv1ent_offset(iova)] += 1; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1024 | goto done; |
| 1025 | } |
| 1026 | |
| 1027 | /* lv1ent_large(ent) == true here */ |
Cho KyongHo | 0bf4e54 | 2014-05-12 11:45:00 +0530 | [diff] [blame] | 1028 | if (WARN_ON(size < LPAGE_SIZE)) { |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 1029 | err_pgsize = LPAGE_SIZE; |
| 1030 | goto err; |
| 1031 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1032 | |
| 1033 | memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE); |
Cho KyongHo | 6cb47ed | 2014-05-12 11:44:51 +0530 | [diff] [blame] | 1034 | pgtable_flush(ent, ent + SPAGES_PER_LPAGE); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1035 | |
| 1036 | size = LPAGE_SIZE; |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1037 | domain->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1038 | done: |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1039 | spin_unlock_irqrestore(&domain->pgtablelock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1040 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1041 | exynos_iommu_tlb_invalidate_entry(domain, iova, size); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1042 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1043 | return size; |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 1044 | err: |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1045 | spin_unlock_irqrestore(&domain->pgtablelock, flags); |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 1046 | |
Cho KyongHo | 0bf4e54 | 2014-05-12 11:45:00 +0530 | [diff] [blame] | 1047 | pr_err("%s: Failed: size(%#zx) @ %#x is smaller than page size %#zx\n", |
| 1048 | __func__, size, iova, err_pgsize); |
Cho KyongHo | 61128f0 | 2014-05-12 11:44:47 +0530 | [diff] [blame] | 1049 | |
| 1050 | return 0; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1051 | } |
| 1052 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1053 | static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *iommu_domain, |
Varun Sethi | bb5547ac | 2013-03-29 01:23:58 +0530 | [diff] [blame] | 1054 | dma_addr_t iova) |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1055 | { |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1056 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
Cho KyongHo | d09d78f | 2014-05-12 11:44:58 +0530 | [diff] [blame] | 1057 | sysmmu_pte_t *entry; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1058 | unsigned long flags; |
| 1059 | phys_addr_t phys = 0; |
| 1060 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1061 | spin_lock_irqsave(&domain->pgtablelock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1062 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1063 | entry = section_entry(domain->pgtable, iova); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1064 | |
| 1065 | if (lv1ent_section(entry)) { |
| 1066 | phys = section_phys(entry) + section_offs(iova); |
| 1067 | } else if (lv1ent_page(entry)) { |
| 1068 | entry = page_entry(entry, iova); |
| 1069 | |
| 1070 | if (lv2ent_large(entry)) |
| 1071 | phys = lpage_phys(entry) + lpage_offs(iova); |
| 1072 | else if (lv2ent_small(entry)) |
| 1073 | phys = spage_phys(entry) + spage_offs(iova); |
| 1074 | } |
| 1075 | |
Marek Szyprowski | bfa0048 | 2015-05-19 15:20:28 +0200 | [diff] [blame] | 1076 | spin_unlock_irqrestore(&domain->pgtablelock, flags); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1077 | |
| 1078 | return phys; |
| 1079 | } |
| 1080 | |
Antonios Motakis | bf4a1c9 | 2014-05-12 11:44:59 +0530 | [diff] [blame] | 1081 | static int exynos_iommu_add_device(struct device *dev) |
| 1082 | { |
| 1083 | struct iommu_group *group; |
| 1084 | int ret; |
| 1085 | |
Marek Szyprowski | 06801db | 2015-05-19 15:20:32 +0200 | [diff] [blame] | 1086 | if (!has_sysmmu(dev)) |
| 1087 | return -ENODEV; |
| 1088 | |
Antonios Motakis | bf4a1c9 | 2014-05-12 11:44:59 +0530 | [diff] [blame] | 1089 | group = iommu_group_get(dev); |
| 1090 | |
| 1091 | if (!group) { |
| 1092 | group = iommu_group_alloc(); |
| 1093 | if (IS_ERR(group)) { |
| 1094 | dev_err(dev, "Failed to allocate IOMMU group\n"); |
| 1095 | return PTR_ERR(group); |
| 1096 | } |
| 1097 | } |
| 1098 | |
| 1099 | ret = iommu_group_add_device(group, dev); |
| 1100 | iommu_group_put(group); |
| 1101 | |
| 1102 | return ret; |
| 1103 | } |
| 1104 | |
| 1105 | static void exynos_iommu_remove_device(struct device *dev) |
| 1106 | { |
Marek Szyprowski | 06801db | 2015-05-19 15:20:32 +0200 | [diff] [blame] | 1107 | if (!has_sysmmu(dev)) |
| 1108 | return; |
| 1109 | |
Antonios Motakis | bf4a1c9 | 2014-05-12 11:44:59 +0530 | [diff] [blame] | 1110 | iommu_group_remove_device(dev); |
| 1111 | } |
| 1112 | |
Thierry Reding | b22f643 | 2014-06-27 09:03:12 +0200 | [diff] [blame] | 1113 | static const struct iommu_ops exynos_iommu_ops = { |
Joerg Roedel | e1fd1ea | 2015-03-26 13:43:11 +0100 | [diff] [blame] | 1114 | .domain_alloc = exynos_iommu_domain_alloc, |
| 1115 | .domain_free = exynos_iommu_domain_free, |
Bjorn Helgaas | ba5fa6f | 2014-05-08 14:49:14 -0600 | [diff] [blame] | 1116 | .attach_dev = exynos_iommu_attach_device, |
| 1117 | .detach_dev = exynos_iommu_detach_device, |
| 1118 | .map = exynos_iommu_map, |
| 1119 | .unmap = exynos_iommu_unmap, |
Olav Haugan | 315786e | 2014-10-25 09:55:16 -0700 | [diff] [blame] | 1120 | .map_sg = default_iommu_map_sg, |
Bjorn Helgaas | ba5fa6f | 2014-05-08 14:49:14 -0600 | [diff] [blame] | 1121 | .iova_to_phys = exynos_iommu_iova_to_phys, |
| 1122 | .add_device = exynos_iommu_add_device, |
| 1123 | .remove_device = exynos_iommu_remove_device, |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1124 | .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE, |
| 1125 | }; |
| 1126 | |
| 1127 | static int __init exynos_iommu_init(void) |
| 1128 | { |
Thierry Reding | a7b67cd | 2015-02-06 11:44:05 +0100 | [diff] [blame] | 1129 | struct device_node *np; |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1130 | int ret; |
| 1131 | |
Thierry Reding | a7b67cd | 2015-02-06 11:44:05 +0100 | [diff] [blame] | 1132 | np = of_find_matching_node(NULL, sysmmu_of_match); |
| 1133 | if (!np) |
| 1134 | return 0; |
| 1135 | |
| 1136 | of_node_put(np); |
| 1137 | |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 1138 | lv2table_kmem_cache = kmem_cache_create("exynos-iommu-lv2table", |
| 1139 | LV2TABLE_SIZE, LV2TABLE_SIZE, 0, NULL); |
| 1140 | if (!lv2table_kmem_cache) { |
| 1141 | pr_err("%s: Failed to create kmem cache\n", __func__); |
| 1142 | return -ENOMEM; |
| 1143 | } |
| 1144 | |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1145 | ret = platform_driver_register(&exynos_sysmmu_driver); |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 1146 | if (ret) { |
| 1147 | pr_err("%s: Failed to register driver\n", __func__); |
| 1148 | goto err_reg_driver; |
| 1149 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1150 | |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 1151 | zero_lv2_table = kmem_cache_zalloc(lv2table_kmem_cache, GFP_KERNEL); |
| 1152 | if (zero_lv2_table == NULL) { |
| 1153 | pr_err("%s: Failed to allocate zero level2 page table\n", |
| 1154 | __func__); |
| 1155 | ret = -ENOMEM; |
| 1156 | goto err_zero_lv2; |
| 1157 | } |
| 1158 | |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 1159 | ret = bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); |
| 1160 | if (ret) { |
| 1161 | pr_err("%s: Failed to register exynos-iommu driver.\n", |
| 1162 | __func__); |
| 1163 | goto err_set_iommu; |
| 1164 | } |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1165 | |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 1166 | return 0; |
| 1167 | err_set_iommu: |
Cho KyongHo | 66a7ed8 | 2014-05-12 11:45:04 +0530 | [diff] [blame] | 1168 | kmem_cache_free(lv2table_kmem_cache, zero_lv2_table); |
| 1169 | err_zero_lv2: |
Cho KyongHo | 734c3c7 | 2014-05-12 11:44:48 +0530 | [diff] [blame] | 1170 | platform_driver_unregister(&exynos_sysmmu_driver); |
| 1171 | err_reg_driver: |
| 1172 | kmem_cache_destroy(lv2table_kmem_cache); |
KyongHo Cho | 2a96536 | 2012-05-12 05:56:09 +0900 | [diff] [blame] | 1173 | return ret; |
| 1174 | } |
| 1175 | subsys_initcall(exynos_iommu_init); |