]>
Commit | Line | Data |
---|---|---|
740a01ee MS |
1 | /* |
2 | * Copyright (c) 2011,2016 Samsung Electronics Co., Ltd. | |
2a96536e KC |
3 | * http://www.samsung.com |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #ifdef CONFIG_EXYNOS_IOMMU_DEBUG | |
11 | #define DEBUG | |
12 | #endif | |
13 | ||
2a96536e | 14 | #include <linux/clk.h> |
8ed55c81 | 15 | #include <linux/dma-mapping.h> |
2a96536e | 16 | #include <linux/err.h> |
312900c6 | 17 | #include <linux/io.h> |
2a96536e | 18 | #include <linux/iommu.h> |
312900c6 | 19 | #include <linux/interrupt.h> |
2a96536e | 20 | #include <linux/list.h> |
8ed55c81 MS |
21 | #include <linux/of.h> |
22 | #include <linux/of_iommu.h> | |
23 | #include <linux/of_platform.h> | |
312900c6 MS |
24 | #include <linux/platform_device.h> |
25 | #include <linux/pm_runtime.h> | |
26 | #include <linux/slab.h> | |
58c6f6a3 | 27 | #include <linux/dma-iommu.h> |
2a96536e | 28 | |
d09d78fc CK |
29 | typedef u32 sysmmu_iova_t; |
30 | typedef u32 sysmmu_pte_t; | |
31 | ||
f171abab | 32 | /* We do not consider super section mapping (16MB) */ |
2a96536e KC |
33 | #define SECT_ORDER 20 |
34 | #define LPAGE_ORDER 16 | |
35 | #define SPAGE_ORDER 12 | |
36 | ||
37 | #define SECT_SIZE (1 << SECT_ORDER) | |
38 | #define LPAGE_SIZE (1 << LPAGE_ORDER) | |
39 | #define SPAGE_SIZE (1 << SPAGE_ORDER) | |
40 | ||
41 | #define SECT_MASK (~(SECT_SIZE - 1)) | |
42 | #define LPAGE_MASK (~(LPAGE_SIZE - 1)) | |
43 | #define SPAGE_MASK (~(SPAGE_SIZE - 1)) | |
44 | ||
66a7ed84 CK |
45 | #define lv1ent_fault(sent) ((*(sent) == ZERO_LV2LINK) || \ |
46 | ((*(sent) & 3) == 0) || ((*(sent) & 3) == 3)) | |
47 | #define lv1ent_zero(sent) (*(sent) == ZERO_LV2LINK) | |
48 | #define lv1ent_page_zero(sent) ((*(sent) & 3) == 1) | |
49 | #define lv1ent_page(sent) ((*(sent) != ZERO_LV2LINK) && \ | |
50 | ((*(sent) & 3) == 1)) | |
2a96536e KC |
51 | #define lv1ent_section(sent) ((*(sent) & 3) == 2) |
52 | ||
53 | #define lv2ent_fault(pent) ((*(pent) & 3) == 0) | |
54 | #define lv2ent_small(pent) ((*(pent) & 2) == 2) | |
55 | #define lv2ent_large(pent) ((*(pent) & 3) == 1) | |
56 | ||
6ae5343c BD |
57 | #ifdef CONFIG_BIG_ENDIAN |
58 | #warning "revisit driver if we can enable big-endian ptes" | |
59 | #endif | |
60 | ||
740a01ee MS |
61 | /* |
62 | * v1.x - v3.x SYSMMU supports 32bit physical and 32bit virtual address spaces | |
63 | * v5.0 introduced support for 36bit physical address space by shifting | |
64 | * all page entry values by 4 bits. | |
65 | * All SYSMMU controllers in the system support the address spaces of the same | |
66 | * size, so PG_ENT_SHIFT can be initialized on first SYSMMU probe to proper | |
67 | * value (0 or 4). | |
68 | */ | |
69 | static short PG_ENT_SHIFT = -1; | |
70 | #define SYSMMU_PG_ENT_SHIFT 0 | |
71 | #define SYSMMU_V5_PG_ENT_SHIFT 4 | |
72 | ||
1a0d8dac MS |
73 | static const sysmmu_pte_t *LV1_PROT; |
74 | static const sysmmu_pte_t SYSMMU_LV1_PROT[] = { | |
75 | ((0 << 15) | (0 << 10)), /* no access */ | |
76 | ((1 << 15) | (1 << 10)), /* IOMMU_READ only */ | |
77 | ((0 << 15) | (1 << 10)), /* IOMMU_WRITE not supported, use read/write */ | |
78 | ((0 << 15) | (1 << 10)), /* IOMMU_READ | IOMMU_WRITE */ | |
79 | }; | |
80 | static const sysmmu_pte_t SYSMMU_V5_LV1_PROT[] = { | |
81 | (0 << 4), /* no access */ | |
82 | (1 << 4), /* IOMMU_READ only */ | |
83 | (2 << 4), /* IOMMU_WRITE only */ | |
84 | (3 << 4), /* IOMMU_READ | IOMMU_WRITE */ | |
85 | }; | |
86 | ||
87 | static const sysmmu_pte_t *LV2_PROT; | |
88 | static const sysmmu_pte_t SYSMMU_LV2_PROT[] = { | |
89 | ((0 << 9) | (0 << 4)), /* no access */ | |
90 | ((1 << 9) | (1 << 4)), /* IOMMU_READ only */ | |
91 | ((0 << 9) | (1 << 4)), /* IOMMU_WRITE not supported, use read/write */ | |
92 | ((0 << 9) | (1 << 4)), /* IOMMU_READ | IOMMU_WRITE */ | |
93 | }; | |
94 | static const sysmmu_pte_t SYSMMU_V5_LV2_PROT[] = { | |
95 | (0 << 2), /* no access */ | |
96 | (1 << 2), /* IOMMU_READ only */ | |
97 | (2 << 2), /* IOMMU_WRITE only */ | |
98 | (3 << 2), /* IOMMU_READ | IOMMU_WRITE */ | |
99 | }; | |
100 | ||
101 | #define SYSMMU_SUPPORTED_PROT_BITS (IOMMU_READ | IOMMU_WRITE) | |
102 | ||
740a01ee MS |
103 | #define sect_to_phys(ent) (((phys_addr_t) ent) << PG_ENT_SHIFT) |
104 | #define section_phys(sent) (sect_to_phys(*(sent)) & SECT_MASK) | |
105 | #define section_offs(iova) (iova & (SECT_SIZE - 1)) | |
106 | #define lpage_phys(pent) (sect_to_phys(*(pent)) & LPAGE_MASK) | |
107 | #define lpage_offs(iova) (iova & (LPAGE_SIZE - 1)) | |
108 | #define spage_phys(pent) (sect_to_phys(*(pent)) & SPAGE_MASK) | |
109 | #define spage_offs(iova) (iova & (SPAGE_SIZE - 1)) | |
2a96536e KC |
110 | |
111 | #define NUM_LV1ENTRIES 4096 | |
d09d78fc | 112 | #define NUM_LV2ENTRIES (SECT_SIZE / SPAGE_SIZE) |
2a96536e | 113 | |
d09d78fc CK |
114 | static u32 lv1ent_offset(sysmmu_iova_t iova) |
115 | { | |
116 | return iova >> SECT_ORDER; | |
117 | } | |
118 | ||
119 | static u32 lv2ent_offset(sysmmu_iova_t iova) | |
120 | { | |
121 | return (iova >> SPAGE_ORDER) & (NUM_LV2ENTRIES - 1); | |
122 | } | |
123 | ||
5e3435eb | 124 | #define LV1TABLE_SIZE (NUM_LV1ENTRIES * sizeof(sysmmu_pte_t)) |
d09d78fc | 125 | #define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(sysmmu_pte_t)) |
2a96536e KC |
126 | |
127 | #define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE) | |
740a01ee | 128 | #define lv2table_base(sent) (sect_to_phys(*(sent) & 0xFFFFFFC0)) |
2a96536e | 129 | |
1a0d8dac | 130 | #define mk_lv1ent_sect(pa, prot) ((pa >> PG_ENT_SHIFT) | LV1_PROT[prot] | 2) |
740a01ee | 131 | #define mk_lv1ent_page(pa) ((pa >> PG_ENT_SHIFT) | 1) |
1a0d8dac MS |
132 | #define mk_lv2ent_lpage(pa, prot) ((pa >> PG_ENT_SHIFT) | LV2_PROT[prot] | 1) |
133 | #define mk_lv2ent_spage(pa, prot) ((pa >> PG_ENT_SHIFT) | LV2_PROT[prot] | 2) | |
2a96536e KC |
134 | |
135 | #define CTRL_ENABLE 0x5 | |
136 | #define CTRL_BLOCK 0x7 | |
137 | #define CTRL_DISABLE 0x0 | |
138 | ||
eeb5184b | 139 | #define CFG_LRU 0x1 |
1a0d8dac | 140 | #define CFG_EAP (1 << 2) |
eeb5184b | 141 | #define CFG_QOS(n) ((n & 0xF) << 7) |
eeb5184b CK |
142 | #define CFG_ACGEN (1 << 24) /* System MMU 3.3 only */ |
143 | #define CFG_SYSSEL (1 << 22) /* System MMU 3.2 only */ | |
144 | #define CFG_FLPDCACHE (1 << 20) /* System MMU 3.2+ only */ | |
145 | ||
740a01ee | 146 | /* common registers */ |
2a96536e KC |
147 | #define REG_MMU_CTRL 0x000 |
148 | #define REG_MMU_CFG 0x004 | |
149 | #define REG_MMU_STATUS 0x008 | |
740a01ee MS |
150 | #define REG_MMU_VERSION 0x034 |
151 | ||
152 | #define MMU_MAJ_VER(val) ((val) >> 7) | |
153 | #define MMU_MIN_VER(val) ((val) & 0x7F) | |
154 | #define MMU_RAW_VER(reg) (((reg) >> 21) & ((1 << 11) - 1)) /* 11 bits */ | |
155 | ||
156 | #define MAKE_MMU_VER(maj, min) ((((maj) & 0xF) << 7) | ((min) & 0x7F)) | |
157 | ||
158 | /* v1.x - v3.x registers */ | |
2a96536e KC |
159 | #define REG_MMU_FLUSH 0x00C |
160 | #define REG_MMU_FLUSH_ENTRY 0x010 | |
161 | #define REG_PT_BASE_ADDR 0x014 | |
162 | #define REG_INT_STATUS 0x018 | |
163 | #define REG_INT_CLEAR 0x01C | |
164 | ||
165 | #define REG_PAGE_FAULT_ADDR 0x024 | |
166 | #define REG_AW_FAULT_ADDR 0x028 | |
167 | #define REG_AR_FAULT_ADDR 0x02C | |
168 | #define REG_DEFAULT_SLAVE_ADDR 0x030 | |
169 | ||
740a01ee MS |
170 | /* v5.x registers */ |
171 | #define REG_V5_PT_BASE_PFN 0x00C | |
172 | #define REG_V5_MMU_FLUSH_ALL 0x010 | |
173 | #define REG_V5_MMU_FLUSH_ENTRY 0x014 | |
d5bf739d MS |
174 | #define REG_V5_MMU_FLUSH_RANGE 0x018 |
175 | #define REG_V5_MMU_FLUSH_START 0x020 | |
176 | #define REG_V5_MMU_FLUSH_END 0x024 | |
740a01ee MS |
177 | #define REG_V5_INT_STATUS 0x060 |
178 | #define REG_V5_INT_CLEAR 0x064 | |
179 | #define REG_V5_FAULT_AR_VA 0x070 | |
180 | #define REG_V5_FAULT_AW_VA 0x080 | |
2a96536e | 181 | |
6b21a5db CK |
182 | #define has_sysmmu(dev) (dev->archdata.iommu != NULL) |
183 | ||
5e3435eb | 184 | static struct device *dma_dev; |
734c3c73 | 185 | static struct kmem_cache *lv2table_kmem_cache; |
66a7ed84 CK |
186 | static sysmmu_pte_t *zero_lv2_table; |
187 | #define ZERO_LV2LINK mk_lv1ent_page(virt_to_phys(zero_lv2_table)) | |
734c3c73 | 188 | |
d09d78fc | 189 | static sysmmu_pte_t *section_entry(sysmmu_pte_t *pgtable, sysmmu_iova_t iova) |
2a96536e KC |
190 | { |
191 | return pgtable + lv1ent_offset(iova); | |
192 | } | |
193 | ||
d09d78fc | 194 | static sysmmu_pte_t *page_entry(sysmmu_pte_t *sent, sysmmu_iova_t iova) |
2a96536e | 195 | { |
d09d78fc | 196 | return (sysmmu_pte_t *)phys_to_virt( |
7222e8db | 197 | lv2table_base(sent)) + lv2ent_offset(iova); |
2a96536e KC |
198 | } |
199 | ||
d093fc7e MS |
200 | /* |
201 | * IOMMU fault information register | |
202 | */ | |
203 | struct sysmmu_fault_info { | |
204 | unsigned int bit; /* bit number in STATUS register */ | |
205 | unsigned short addr_reg; /* register to read VA fault address */ | |
206 | const char *name; /* human readable fault name */ | |
207 | unsigned int type; /* fault type for report_iommu_fault */ | |
2a96536e KC |
208 | }; |
209 | ||
d093fc7e MS |
210 | static const struct sysmmu_fault_info sysmmu_faults[] = { |
211 | { 0, REG_PAGE_FAULT_ADDR, "PAGE", IOMMU_FAULT_READ }, | |
212 | { 1, REG_AR_FAULT_ADDR, "AR MULTI-HIT", IOMMU_FAULT_READ }, | |
213 | { 2, REG_AW_FAULT_ADDR, "AW MULTI-HIT", IOMMU_FAULT_WRITE }, | |
214 | { 3, REG_DEFAULT_SLAVE_ADDR, "BUS ERROR", IOMMU_FAULT_READ }, | |
215 | { 4, REG_AR_FAULT_ADDR, "AR SECURITY PROTECTION", IOMMU_FAULT_READ }, | |
216 | { 5, REG_AR_FAULT_ADDR, "AR ACCESS PROTECTION", IOMMU_FAULT_READ }, | |
217 | { 6, REG_AW_FAULT_ADDR, "AW SECURITY PROTECTION", IOMMU_FAULT_WRITE }, | |
218 | { 7, REG_AW_FAULT_ADDR, "AW ACCESS PROTECTION", IOMMU_FAULT_WRITE }, | |
2a96536e KC |
219 | }; |
220 | ||
740a01ee MS |
221 | static const struct sysmmu_fault_info sysmmu_v5_faults[] = { |
222 | { 0, REG_V5_FAULT_AR_VA, "AR PTW", IOMMU_FAULT_READ }, | |
223 | { 1, REG_V5_FAULT_AR_VA, "AR PAGE", IOMMU_FAULT_READ }, | |
224 | { 2, REG_V5_FAULT_AR_VA, "AR MULTI-HIT", IOMMU_FAULT_READ }, | |
225 | { 3, REG_V5_FAULT_AR_VA, "AR ACCESS PROTECTION", IOMMU_FAULT_READ }, | |
226 | { 4, REG_V5_FAULT_AR_VA, "AR SECURITY PROTECTION", IOMMU_FAULT_READ }, | |
227 | { 16, REG_V5_FAULT_AW_VA, "AW PTW", IOMMU_FAULT_WRITE }, | |
228 | { 17, REG_V5_FAULT_AW_VA, "AW PAGE", IOMMU_FAULT_WRITE }, | |
229 | { 18, REG_V5_FAULT_AW_VA, "AW MULTI-HIT", IOMMU_FAULT_WRITE }, | |
230 | { 19, REG_V5_FAULT_AW_VA, "AW ACCESS PROTECTION", IOMMU_FAULT_WRITE }, | |
231 | { 20, REG_V5_FAULT_AW_VA, "AW SECURITY PROTECTION", IOMMU_FAULT_WRITE }, | |
232 | }; | |
233 | ||
2860af3c MS |
234 | /* |
235 | * This structure is attached to dev.archdata.iommu of the master device | |
236 | * on device add, contains a list of SYSMMU controllers defined by device tree, | |
237 | * which are bound to given master device. It is usually referenced by 'owner' | |
238 | * pointer. | |
239 | */ | |
6b21a5db | 240 | struct exynos_iommu_owner { |
1b092054 | 241 | struct list_head controllers; /* list of sysmmu_drvdata.owner_node */ |
5fa61cbf | 242 | struct iommu_domain *domain; /* domain this device is attached */ |
9b265536 | 243 | struct mutex rpm_lock; /* for runtime pm of all sysmmus */ |
6b21a5db CK |
244 | }; |
245 | ||
2860af3c MS |
246 | /* |
247 | * This structure exynos specific generalization of struct iommu_domain. | |
248 | * It contains list of SYSMMU controllers from all master devices, which has | |
249 | * been attached to this domain and page tables of IO address space defined by | |
250 | * it. It is usually referenced by 'domain' pointer. | |
251 | */ | |
2a96536e | 252 | struct exynos_iommu_domain { |
2860af3c MS |
253 | struct list_head clients; /* list of sysmmu_drvdata.domain_node */ |
254 | sysmmu_pte_t *pgtable; /* lv1 page table, 16KB */ | |
255 | short *lv2entcnt; /* free lv2 entry counter for each section */ | |
256 | spinlock_t lock; /* lock for modyfying list of clients */ | |
257 | spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */ | |
e1fd1eaa | 258 | struct iommu_domain domain; /* generic domain data structure */ |
2a96536e KC |
259 | }; |
260 | ||
2860af3c MS |
261 | /* |
262 | * This structure hold all data of a single SYSMMU controller, this includes | |
263 | * hw resources like registers and clocks, pointers and list nodes to connect | |
264 | * it to all other structures, internal state and parameters read from device | |
265 | * tree. It is usually referenced by 'data' pointer. | |
266 | */ | |
2a96536e | 267 | struct sysmmu_drvdata { |
2860af3c MS |
268 | struct device *sysmmu; /* SYSMMU controller device */ |
269 | struct device *master; /* master device (owner) */ | |
270 | void __iomem *sfrbase; /* our registers */ | |
271 | struct clk *clk; /* SYSMMU's clock */ | |
740a01ee MS |
272 | struct clk *aclk; /* SYSMMU's aclk clock */ |
273 | struct clk *pclk; /* SYSMMU's pclk clock */ | |
2860af3c | 274 | struct clk *clk_master; /* master's device clock */ |
2860af3c | 275 | spinlock_t lock; /* lock for modyfying state */ |
47a574ff | 276 | bool active; /* current status */ |
2860af3c MS |
277 | struct exynos_iommu_domain *domain; /* domain we belong to */ |
278 | struct list_head domain_node; /* node for domain clients list */ | |
1b092054 | 279 | struct list_head owner_node; /* node for owner controllers list */ |
2860af3c MS |
280 | phys_addr_t pgtable; /* assigned page table structure */ |
281 | unsigned int version; /* our version */ | |
d2c302b6 JR |
282 | |
283 | struct iommu_device iommu; /* IOMMU core handle */ | |
2a96536e KC |
284 | }; |
285 | ||
e1fd1eaa JR |
286 | static struct exynos_iommu_domain *to_exynos_domain(struct iommu_domain *dom) |
287 | { | |
288 | return container_of(dom, struct exynos_iommu_domain, domain); | |
289 | } | |
290 | ||
02cdc365 | 291 | static void sysmmu_unblock(struct sysmmu_drvdata *data) |
2a96536e | 292 | { |
84bd0428 | 293 | writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL); |
2a96536e KC |
294 | } |
295 | ||
02cdc365 | 296 | static bool sysmmu_block(struct sysmmu_drvdata *data) |
2a96536e KC |
297 | { |
298 | int i = 120; | |
299 | ||
84bd0428 MS |
300 | writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL); |
301 | while ((i > 0) && !(readl(data->sfrbase + REG_MMU_STATUS) & 1)) | |
2a96536e KC |
302 | --i; |
303 | ||
84bd0428 | 304 | if (!(readl(data->sfrbase + REG_MMU_STATUS) & 1)) { |
02cdc365 | 305 | sysmmu_unblock(data); |
2a96536e KC |
306 | return false; |
307 | } | |
308 | ||
309 | return true; | |
310 | } | |
311 | ||
02cdc365 | 312 | static void __sysmmu_tlb_invalidate(struct sysmmu_drvdata *data) |
2a96536e | 313 | { |
740a01ee | 314 | if (MMU_MAJ_VER(data->version) < 5) |
84bd0428 | 315 | writel(0x1, data->sfrbase + REG_MMU_FLUSH); |
740a01ee | 316 | else |
84bd0428 | 317 | writel(0x1, data->sfrbase + REG_V5_MMU_FLUSH_ALL); |
2a96536e KC |
318 | } |
319 | ||
02cdc365 | 320 | static void __sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data, |
d09d78fc | 321 | sysmmu_iova_t iova, unsigned int num_inv) |
2a96536e | 322 | { |
3ad6b7f3 | 323 | unsigned int i; |
365409db | 324 | |
d5bf739d MS |
325 | if (MMU_MAJ_VER(data->version) < 5) { |
326 | for (i = 0; i < num_inv; i++) { | |
84bd0428 | 327 | writel((iova & SPAGE_MASK) | 1, |
740a01ee | 328 | data->sfrbase + REG_MMU_FLUSH_ENTRY); |
d5bf739d MS |
329 | iova += SPAGE_SIZE; |
330 | } | |
331 | } else { | |
332 | if (num_inv == 1) { | |
84bd0428 | 333 | writel((iova & SPAGE_MASK) | 1, |
740a01ee | 334 | data->sfrbase + REG_V5_MMU_FLUSH_ENTRY); |
d5bf739d MS |
335 | } else { |
336 | writel((iova & SPAGE_MASK), | |
337 | data->sfrbase + REG_V5_MMU_FLUSH_START); | |
338 | writel((iova & SPAGE_MASK) + (num_inv - 1) * SPAGE_SIZE, | |
339 | data->sfrbase + REG_V5_MMU_FLUSH_END); | |
340 | writel(1, data->sfrbase + REG_V5_MMU_FLUSH_RANGE); | |
341 | } | |
3ad6b7f3 | 342 | } |
2a96536e KC |
343 | } |
344 | ||
02cdc365 | 345 | static void __sysmmu_set_ptbase(struct sysmmu_drvdata *data, phys_addr_t pgd) |
2a96536e | 346 | { |
740a01ee | 347 | if (MMU_MAJ_VER(data->version) < 5) |
84bd0428 | 348 | writel(pgd, data->sfrbase + REG_PT_BASE_ADDR); |
740a01ee | 349 | else |
84bd0428 | 350 | writel(pgd >> PAGE_SHIFT, |
740a01ee | 351 | data->sfrbase + REG_V5_PT_BASE_PFN); |
2a96536e | 352 | |
02cdc365 | 353 | __sysmmu_tlb_invalidate(data); |
2a96536e KC |
354 | } |
355 | ||
fecc49db MS |
356 | static void __sysmmu_enable_clocks(struct sysmmu_drvdata *data) |
357 | { | |
358 | BUG_ON(clk_prepare_enable(data->clk_master)); | |
359 | BUG_ON(clk_prepare_enable(data->clk)); | |
360 | BUG_ON(clk_prepare_enable(data->pclk)); | |
361 | BUG_ON(clk_prepare_enable(data->aclk)); | |
362 | } | |
363 | ||
364 | static void __sysmmu_disable_clocks(struct sysmmu_drvdata *data) | |
365 | { | |
366 | clk_disable_unprepare(data->aclk); | |
367 | clk_disable_unprepare(data->pclk); | |
368 | clk_disable_unprepare(data->clk); | |
369 | clk_disable_unprepare(data->clk_master); | |
370 | } | |
371 | ||
850d313e MS |
372 | static void __sysmmu_get_version(struct sysmmu_drvdata *data) |
373 | { | |
374 | u32 ver; | |
375 | ||
fecc49db | 376 | __sysmmu_enable_clocks(data); |
850d313e | 377 | |
84bd0428 | 378 | ver = readl(data->sfrbase + REG_MMU_VERSION); |
850d313e MS |
379 | |
380 | /* controllers on some SoCs don't report proper version */ | |
381 | if (ver == 0x80000001u) | |
382 | data->version = MAKE_MMU_VER(1, 0); | |
383 | else | |
384 | data->version = MMU_RAW_VER(ver); | |
385 | ||
386 | dev_dbg(data->sysmmu, "hardware version: %d.%d\n", | |
387 | MMU_MAJ_VER(data->version), MMU_MIN_VER(data->version)); | |
388 | ||
fecc49db | 389 | __sysmmu_disable_clocks(data); |
850d313e MS |
390 | } |
391 | ||
d093fc7e MS |
392 | static void show_fault_information(struct sysmmu_drvdata *data, |
393 | const struct sysmmu_fault_info *finfo, | |
394 | sysmmu_iova_t fault_addr) | |
2a96536e | 395 | { |
d09d78fc | 396 | sysmmu_pte_t *ent; |
2a96536e | 397 | |
ec5d241b MS |
398 | dev_err(data->sysmmu, "%s: %s FAULT occurred at %#x\n", |
399 | dev_name(data->master), finfo->name, fault_addr); | |
400 | dev_dbg(data->sysmmu, "Page table base: %pa\n", &data->pgtable); | |
d093fc7e | 401 | ent = section_entry(phys_to_virt(data->pgtable), fault_addr); |
ec5d241b | 402 | dev_dbg(data->sysmmu, "\tLv1 entry: %#x\n", *ent); |
2a96536e KC |
403 | if (lv1ent_page(ent)) { |
404 | ent = page_entry(ent, fault_addr); | |
ec5d241b | 405 | dev_dbg(data->sysmmu, "\t Lv2 entry: %#x\n", *ent); |
2a96536e | 406 | } |
2a96536e KC |
407 | } |
408 | ||
409 | static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) | |
410 | { | |
f171abab | 411 | /* SYSMMU is in blocked state when interrupt occurred. */ |
2a96536e | 412 | struct sysmmu_drvdata *data = dev_id; |
740a01ee MS |
413 | const struct sysmmu_fault_info *finfo; |
414 | unsigned int i, n, itype; | |
d093fc7e | 415 | sysmmu_iova_t fault_addr = -1; |
740a01ee | 416 | unsigned short reg_status, reg_clear; |
7222e8db | 417 | int ret = -ENOSYS; |
2a96536e | 418 | |
47a574ff | 419 | WARN_ON(!data->active); |
2a96536e | 420 | |
740a01ee MS |
421 | if (MMU_MAJ_VER(data->version) < 5) { |
422 | reg_status = REG_INT_STATUS; | |
423 | reg_clear = REG_INT_CLEAR; | |
424 | finfo = sysmmu_faults; | |
425 | n = ARRAY_SIZE(sysmmu_faults); | |
426 | } else { | |
427 | reg_status = REG_V5_INT_STATUS; | |
428 | reg_clear = REG_V5_INT_CLEAR; | |
429 | finfo = sysmmu_v5_faults; | |
430 | n = ARRAY_SIZE(sysmmu_v5_faults); | |
431 | } | |
432 | ||
9d4e7a24 CK |
433 | spin_lock(&data->lock); |
434 | ||
b398af21 | 435 | clk_enable(data->clk_master); |
9d4e7a24 | 436 | |
84bd0428 | 437 | itype = __ffs(readl(data->sfrbase + reg_status)); |
d093fc7e MS |
438 | for (i = 0; i < n; i++, finfo++) |
439 | if (finfo->bit == itype) | |
440 | break; | |
441 | /* unknown/unsupported fault */ | |
442 | BUG_ON(i == n); | |
443 | ||
444 | /* print debug message */ | |
84bd0428 | 445 | fault_addr = readl(data->sfrbase + finfo->addr_reg); |
d093fc7e | 446 | show_fault_information(data, finfo, fault_addr); |
2a96536e | 447 | |
d093fc7e MS |
448 | if (data->domain) |
449 | ret = report_iommu_fault(&data->domain->domain, | |
450 | data->master, fault_addr, finfo->type); | |
1fab7fa7 CK |
451 | /* fault is not recovered by fault handler */ |
452 | BUG_ON(ret != 0); | |
2a96536e | 453 | |
84bd0428 | 454 | writel(1 << itype, data->sfrbase + reg_clear); |
1fab7fa7 | 455 | |
02cdc365 | 456 | sysmmu_unblock(data); |
2a96536e | 457 | |
b398af21 | 458 | clk_disable(data->clk_master); |
70605870 | 459 | |
9d4e7a24 | 460 | spin_unlock(&data->lock); |
2a96536e KC |
461 | |
462 | return IRQ_HANDLED; | |
463 | } | |
464 | ||
47a574ff | 465 | static void __sysmmu_disable(struct sysmmu_drvdata *data) |
2a96536e | 466 | { |
47a574ff MS |
467 | unsigned long flags; |
468 | ||
b398af21 | 469 | clk_enable(data->clk_master); |
70605870 | 470 | |
47a574ff | 471 | spin_lock_irqsave(&data->lock, flags); |
84bd0428 MS |
472 | writel(CTRL_DISABLE, data->sfrbase + REG_MMU_CTRL); |
473 | writel(0, data->sfrbase + REG_MMU_CFG); | |
47a574ff | 474 | data->active = false; |
6b21a5db CK |
475 | spin_unlock_irqrestore(&data->lock, flags); |
476 | ||
47a574ff | 477 | __sysmmu_disable_clocks(data); |
6b21a5db | 478 | } |
2a96536e | 479 | |
6b21a5db CK |
480 | static void __sysmmu_init_config(struct sysmmu_drvdata *data) |
481 | { | |
83addecd MS |
482 | unsigned int cfg; |
483 | ||
83addecd MS |
484 | if (data->version <= MAKE_MMU_VER(3, 1)) |
485 | cfg = CFG_LRU | CFG_QOS(15); | |
486 | else if (data->version <= MAKE_MMU_VER(3, 2)) | |
487 | cfg = CFG_LRU | CFG_QOS(15) | CFG_FLPDCACHE | CFG_SYSSEL; | |
488 | else | |
489 | cfg = CFG_QOS(15) | CFG_FLPDCACHE | CFG_ACGEN; | |
6b21a5db | 490 | |
1a0d8dac MS |
491 | cfg |= CFG_EAP; /* enable access protection bits check */ |
492 | ||
84bd0428 | 493 | writel(cfg, data->sfrbase + REG_MMU_CFG); |
6b21a5db CK |
494 | } |
495 | ||
47a574ff | 496 | static void __sysmmu_enable(struct sysmmu_drvdata *data) |
6b21a5db | 497 | { |
47a574ff MS |
498 | unsigned long flags; |
499 | ||
fecc49db | 500 | __sysmmu_enable_clocks(data); |
70605870 | 501 | |
47a574ff | 502 | spin_lock_irqsave(&data->lock, flags); |
84bd0428 | 503 | writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL); |
6b21a5db | 504 | __sysmmu_init_config(data); |
02cdc365 | 505 | __sysmmu_set_ptbase(data, data->pgtable); |
84bd0428 | 506 | writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL); |
47a574ff MS |
507 | data->active = true; |
508 | spin_unlock_irqrestore(&data->lock, flags); | |
7222e8db | 509 | |
fecc49db MS |
510 | /* |
511 | * SYSMMU driver keeps master's clock enabled only for the short | |
512 | * time, while accessing the registers. For performing address | |
513 | * translation during DMA transaction it relies on the client | |
514 | * driver to enable it. | |
515 | */ | |
b398af21 | 516 | clk_disable(data->clk_master); |
6b21a5db | 517 | } |
70605870 | 518 | |
469acebe | 519 | static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, |
66a7ed84 CK |
520 | sysmmu_iova_t iova) |
521 | { | |
522 | unsigned long flags; | |
66a7ed84 | 523 | |
66a7ed84 | 524 | spin_lock_irqsave(&data->lock, flags); |
47a574ff | 525 | if (data->active && data->version >= MAKE_MMU_VER(3, 3)) { |
01324ab2 | 526 | clk_enable(data->clk_master); |
7d2aa6b8 | 527 | if (sysmmu_block(data)) { |
cd37a296 MS |
528 | if (data->version >= MAKE_MMU_VER(5, 0)) |
529 | __sysmmu_tlb_invalidate(data); | |
530 | else | |
531 | __sysmmu_tlb_invalidate_entry(data, iova, 1); | |
7d2aa6b8 MS |
532 | sysmmu_unblock(data); |
533 | } | |
01324ab2 | 534 | clk_disable(data->clk_master); |
d631ea98 | 535 | } |
66a7ed84 | 536 | spin_unlock_irqrestore(&data->lock, flags); |
66a7ed84 CK |
537 | } |
538 | ||
469acebe MS |
539 | static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data, |
540 | sysmmu_iova_t iova, size_t size) | |
2a96536e KC |
541 | { |
542 | unsigned long flags; | |
2a96536e | 543 | |
6b21a5db | 544 | spin_lock_irqsave(&data->lock, flags); |
47a574ff | 545 | if (data->active) { |
3ad6b7f3 | 546 | unsigned int num_inv = 1; |
70605870 | 547 | |
b398af21 | 548 | clk_enable(data->clk_master); |
70605870 | 549 | |
3ad6b7f3 CK |
550 | /* |
551 | * L2TLB invalidation required | |
552 | * 4KB page: 1 invalidation | |
f171abab SK |
553 | * 64KB page: 16 invalidations |
554 | * 1MB page: 64 invalidations | |
3ad6b7f3 CK |
555 | * because it is set-associative TLB |
556 | * with 8-way and 64 sets. | |
557 | * 1MB page can be cached in one of all sets. | |
558 | * 64KB page can be one of 16 consecutive sets. | |
559 | */ | |
512bd0c6 | 560 | if (MMU_MAJ_VER(data->version) == 2) |
3ad6b7f3 CK |
561 | num_inv = min_t(unsigned int, size / PAGE_SIZE, 64); |
562 | ||
02cdc365 MS |
563 | if (sysmmu_block(data)) { |
564 | __sysmmu_tlb_invalidate_entry(data, iova, num_inv); | |
565 | sysmmu_unblock(data); | |
2a96536e | 566 | } |
b398af21 | 567 | clk_disable(data->clk_master); |
2a96536e | 568 | } |
9d4e7a24 | 569 | spin_unlock_irqrestore(&data->lock, flags); |
2a96536e KC |
570 | } |
571 | ||
96f66557 MS |
572 | static struct iommu_ops exynos_iommu_ops; |
573 | ||
6b21a5db | 574 | static int __init exynos_sysmmu_probe(struct platform_device *pdev) |
2a96536e | 575 | { |
46c16d1e | 576 | int irq, ret; |
7222e8db | 577 | struct device *dev = &pdev->dev; |
2a96536e | 578 | struct sysmmu_drvdata *data; |
7222e8db | 579 | struct resource *res; |
2a96536e | 580 | |
46c16d1e CK |
581 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
582 | if (!data) | |
583 | return -ENOMEM; | |
2a96536e | 584 | |
7222e8db | 585 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
46c16d1e CK |
586 | data->sfrbase = devm_ioremap_resource(dev, res); |
587 | if (IS_ERR(data->sfrbase)) | |
588 | return PTR_ERR(data->sfrbase); | |
2a96536e | 589 | |
46c16d1e CK |
590 | irq = platform_get_irq(pdev, 0); |
591 | if (irq <= 0) { | |
0bf4e54d | 592 | dev_err(dev, "Unable to find IRQ resource\n"); |
46c16d1e | 593 | return irq; |
2a96536e KC |
594 | } |
595 | ||
46c16d1e | 596 | ret = devm_request_irq(dev, irq, exynos_sysmmu_irq, 0, |
7222e8db CK |
597 | dev_name(dev), data); |
598 | if (ret) { | |
46c16d1e CK |
599 | dev_err(dev, "Unabled to register handler of irq %d\n", irq); |
600 | return ret; | |
2a96536e KC |
601 | } |
602 | ||
46c16d1e | 603 | data->clk = devm_clk_get(dev, "sysmmu"); |
0c2b063f | 604 | if (PTR_ERR(data->clk) == -ENOENT) |
740a01ee | 605 | data->clk = NULL; |
0c2b063f MS |
606 | else if (IS_ERR(data->clk)) |
607 | return PTR_ERR(data->clk); | |
740a01ee MS |
608 | |
609 | data->aclk = devm_clk_get(dev, "aclk"); | |
0c2b063f | 610 | if (PTR_ERR(data->aclk) == -ENOENT) |
740a01ee | 611 | data->aclk = NULL; |
0c2b063f MS |
612 | else if (IS_ERR(data->aclk)) |
613 | return PTR_ERR(data->aclk); | |
740a01ee MS |
614 | |
615 | data->pclk = devm_clk_get(dev, "pclk"); | |
0c2b063f | 616 | if (PTR_ERR(data->pclk) == -ENOENT) |
740a01ee | 617 | data->pclk = NULL; |
0c2b063f MS |
618 | else if (IS_ERR(data->pclk)) |
619 | return PTR_ERR(data->pclk); | |
740a01ee MS |
620 | |
621 | if (!data->clk && (!data->aclk || !data->pclk)) { | |
622 | dev_err(dev, "Failed to get device clock(s)!\n"); | |
623 | return -ENOSYS; | |
2a96536e KC |
624 | } |
625 | ||
70605870 | 626 | data->clk_master = devm_clk_get(dev, "master"); |
0c2b063f | 627 | if (PTR_ERR(data->clk_master) == -ENOENT) |
b398af21 | 628 | data->clk_master = NULL; |
0c2b063f MS |
629 | else if (IS_ERR(data->clk_master)) |
630 | return PTR_ERR(data->clk_master); | |
70605870 | 631 | |
2a96536e | 632 | data->sysmmu = dev; |
9d4e7a24 | 633 | spin_lock_init(&data->lock); |
2a96536e | 634 | |
d2c302b6 JR |
635 | ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL, |
636 | dev_name(data->sysmmu)); | |
637 | if (ret) | |
638 | return ret; | |
639 | ||
640 | iommu_device_set_ops(&data->iommu, &exynos_iommu_ops); | |
641 | iommu_device_set_fwnode(&data->iommu, &dev->of_node->fwnode); | |
642 | ||
643 | ret = iommu_device_register(&data->iommu); | |
644 | if (ret) | |
645 | return ret; | |
646 | ||
7222e8db CK |
647 | platform_set_drvdata(pdev, data); |
648 | ||
850d313e | 649 | __sysmmu_get_version(data); |
740a01ee | 650 | if (PG_ENT_SHIFT < 0) { |
1a0d8dac | 651 | if (MMU_MAJ_VER(data->version) < 5) { |
740a01ee | 652 | PG_ENT_SHIFT = SYSMMU_PG_ENT_SHIFT; |
1a0d8dac MS |
653 | LV1_PROT = SYSMMU_LV1_PROT; |
654 | LV2_PROT = SYSMMU_LV2_PROT; | |
655 | } else { | |
740a01ee | 656 | PG_ENT_SHIFT = SYSMMU_V5_PG_ENT_SHIFT; |
1a0d8dac MS |
657 | LV1_PROT = SYSMMU_V5_LV1_PROT; |
658 | LV2_PROT = SYSMMU_V5_LV2_PROT; | |
659 | } | |
740a01ee MS |
660 | } |
661 | ||
f4723ec1 | 662 | pm_runtime_enable(dev); |
2a96536e | 663 | |
2a96536e | 664 | return 0; |
2a96536e KC |
665 | } |
666 | ||
9b265536 | 667 | static int __maybe_unused exynos_sysmmu_suspend(struct device *dev) |
622015e4 MS |
668 | { |
669 | struct sysmmu_drvdata *data = dev_get_drvdata(dev); | |
47a574ff | 670 | struct device *master = data->master; |
622015e4 | 671 | |
47a574ff | 672 | if (master) { |
9b265536 MS |
673 | struct exynos_iommu_owner *owner = master->archdata.iommu; |
674 | ||
675 | mutex_lock(&owner->rpm_lock); | |
92798b45 MS |
676 | if (data->domain) { |
677 | dev_dbg(data->sysmmu, "saving state\n"); | |
678 | __sysmmu_disable(data); | |
679 | } | |
9b265536 | 680 | mutex_unlock(&owner->rpm_lock); |
622015e4 MS |
681 | } |
682 | return 0; | |
683 | } | |
684 | ||
9b265536 | 685 | static int __maybe_unused exynos_sysmmu_resume(struct device *dev) |
622015e4 MS |
686 | { |
687 | struct sysmmu_drvdata *data = dev_get_drvdata(dev); | |
47a574ff | 688 | struct device *master = data->master; |
622015e4 | 689 | |
47a574ff | 690 | if (master) { |
9b265536 MS |
691 | struct exynos_iommu_owner *owner = master->archdata.iommu; |
692 | ||
693 | mutex_lock(&owner->rpm_lock); | |
92798b45 MS |
694 | if (data->domain) { |
695 | dev_dbg(data->sysmmu, "restoring state\n"); | |
696 | __sysmmu_enable(data); | |
697 | } | |
9b265536 | 698 | mutex_unlock(&owner->rpm_lock); |
622015e4 MS |
699 | } |
700 | return 0; | |
701 | } | |
622015e4 MS |
702 | |
703 | static const struct dev_pm_ops sysmmu_pm_ops = { | |
9b265536 | 704 | SET_RUNTIME_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume, NULL) |
2f5f44f2 MS |
705 | SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, |
706 | pm_runtime_force_resume) | |
622015e4 MS |
707 | }; |
708 | ||
6b21a5db CK |
709 | static const struct of_device_id sysmmu_of_match[] __initconst = { |
710 | { .compatible = "samsung,exynos-sysmmu", }, | |
711 | { }, | |
712 | }; | |
713 | ||
714 | static struct platform_driver exynos_sysmmu_driver __refdata = { | |
715 | .probe = exynos_sysmmu_probe, | |
716 | .driver = { | |
2a96536e | 717 | .name = "exynos-sysmmu", |
6b21a5db | 718 | .of_match_table = sysmmu_of_match, |
622015e4 | 719 | .pm = &sysmmu_pm_ops, |
b54b874f | 720 | .suppress_bind_attrs = true, |
2a96536e KC |
721 | } |
722 | }; | |
723 | ||
5e3435eb | 724 | static inline void update_pte(sysmmu_pte_t *ent, sysmmu_pte_t val) |
2a96536e | 725 | { |
5e3435eb MS |
726 | dma_sync_single_for_cpu(dma_dev, virt_to_phys(ent), sizeof(*ent), |
727 | DMA_TO_DEVICE); | |
6ae5343c | 728 | *ent = cpu_to_le32(val); |
5e3435eb MS |
729 | dma_sync_single_for_device(dma_dev, virt_to_phys(ent), sizeof(*ent), |
730 | DMA_TO_DEVICE); | |
2a96536e KC |
731 | } |
732 | ||
e1fd1eaa | 733 | static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type) |
2a96536e | 734 | { |
bfa00489 | 735 | struct exynos_iommu_domain *domain; |
5e3435eb | 736 | dma_addr_t handle; |
66a7ed84 | 737 | int i; |
2a96536e | 738 | |
740a01ee MS |
739 | /* Check if correct PTE offsets are initialized */ |
740 | BUG_ON(PG_ENT_SHIFT < 0 || !dma_dev); | |
e1fd1eaa | 741 | |
bfa00489 MS |
742 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
743 | if (!domain) | |
e1fd1eaa | 744 | return NULL; |
2a96536e | 745 | |
58c6f6a3 MS |
746 | if (type == IOMMU_DOMAIN_DMA) { |
747 | if (iommu_get_dma_cookie(&domain->domain) != 0) | |
748 | goto err_pgtable; | |
749 | } else if (type != IOMMU_DOMAIN_UNMANAGED) { | |
750 | goto err_pgtable; | |
751 | } | |
752 | ||
bfa00489 MS |
753 | domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2); |
754 | if (!domain->pgtable) | |
58c6f6a3 | 755 | goto err_dma_cookie; |
2a96536e | 756 | |
bfa00489 MS |
757 | domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1); |
758 | if (!domain->lv2entcnt) | |
2a96536e KC |
759 | goto err_counter; |
760 | ||
f171abab | 761 | /* Workaround for System MMU v3.3 to prevent caching 1MiB mapping */ |
e7527663 MS |
762 | for (i = 0; i < NUM_LV1ENTRIES; i++) |
763 | domain->pgtable[i] = ZERO_LV2LINK; | |
66a7ed84 | 764 | |
5e3435eb MS |
765 | handle = dma_map_single(dma_dev, domain->pgtable, LV1TABLE_SIZE, |
766 | DMA_TO_DEVICE); | |
767 | /* For mapping page table entries we rely on dma == phys */ | |
768 | BUG_ON(handle != virt_to_phys(domain->pgtable)); | |
0d6d3da4 MS |
769 | if (dma_mapping_error(dma_dev, handle)) |
770 | goto err_lv2ent; | |
2a96536e | 771 | |
bfa00489 MS |
772 | spin_lock_init(&domain->lock); |
773 | spin_lock_init(&domain->pgtablelock); | |
774 | INIT_LIST_HEAD(&domain->clients); | |
2a96536e | 775 | |
bfa00489 MS |
776 | domain->domain.geometry.aperture_start = 0; |
777 | domain->domain.geometry.aperture_end = ~0UL; | |
778 | domain->domain.geometry.force_aperture = true; | |
3177bb76 | 779 | |
bfa00489 | 780 | return &domain->domain; |
2a96536e | 781 | |
0d6d3da4 MS |
782 | err_lv2ent: |
783 | free_pages((unsigned long)domain->lv2entcnt, 1); | |
2a96536e | 784 | err_counter: |
bfa00489 | 785 | free_pages((unsigned long)domain->pgtable, 2); |
58c6f6a3 MS |
786 | err_dma_cookie: |
787 | if (type == IOMMU_DOMAIN_DMA) | |
788 | iommu_put_dma_cookie(&domain->domain); | |
2a96536e | 789 | err_pgtable: |
bfa00489 | 790 | kfree(domain); |
e1fd1eaa | 791 | return NULL; |
2a96536e KC |
792 | } |
793 | ||
bfa00489 | 794 | static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain) |
2a96536e | 795 | { |
bfa00489 | 796 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
469acebe | 797 | struct sysmmu_drvdata *data, *next; |
2a96536e KC |
798 | unsigned long flags; |
799 | int i; | |
800 | ||
bfa00489 | 801 | WARN_ON(!list_empty(&domain->clients)); |
2a96536e | 802 | |
bfa00489 | 803 | spin_lock_irqsave(&domain->lock, flags); |
2a96536e | 804 | |
bfa00489 | 805 | list_for_each_entry_safe(data, next, &domain->clients, domain_node) { |
e1172300 | 806 | spin_lock(&data->lock); |
b0d4c861 | 807 | __sysmmu_disable(data); |
47a574ff MS |
808 | data->pgtable = 0; |
809 | data->domain = NULL; | |
469acebe | 810 | list_del_init(&data->domain_node); |
e1172300 | 811 | spin_unlock(&data->lock); |
2a96536e KC |
812 | } |
813 | ||
bfa00489 | 814 | spin_unlock_irqrestore(&domain->lock, flags); |
2a96536e | 815 | |
58c6f6a3 MS |
816 | if (iommu_domain->type == IOMMU_DOMAIN_DMA) |
817 | iommu_put_dma_cookie(iommu_domain); | |
818 | ||
5e3435eb MS |
819 | dma_unmap_single(dma_dev, virt_to_phys(domain->pgtable), LV1TABLE_SIZE, |
820 | DMA_TO_DEVICE); | |
821 | ||
2a96536e | 822 | for (i = 0; i < NUM_LV1ENTRIES; i++) |
5e3435eb MS |
823 | if (lv1ent_page(domain->pgtable + i)) { |
824 | phys_addr_t base = lv2table_base(domain->pgtable + i); | |
825 | ||
826 | dma_unmap_single(dma_dev, base, LV2TABLE_SIZE, | |
827 | DMA_TO_DEVICE); | |
734c3c73 | 828 | kmem_cache_free(lv2table_kmem_cache, |
5e3435eb MS |
829 | phys_to_virt(base)); |
830 | } | |
2a96536e | 831 | |
bfa00489 MS |
832 | free_pages((unsigned long)domain->pgtable, 2); |
833 | free_pages((unsigned long)domain->lv2entcnt, 1); | |
834 | kfree(domain); | |
2a96536e KC |
835 | } |
836 | ||
5fa61cbf MS |
837 | static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain, |
838 | struct device *dev) | |
839 | { | |
840 | struct exynos_iommu_owner *owner = dev->archdata.iommu; | |
841 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); | |
842 | phys_addr_t pagetable = virt_to_phys(domain->pgtable); | |
843 | struct sysmmu_drvdata *data, *next; | |
844 | unsigned long flags; | |
5fa61cbf MS |
845 | |
846 | if (!has_sysmmu(dev) || owner->domain != iommu_domain) | |
847 | return; | |
848 | ||
9b265536 MS |
849 | mutex_lock(&owner->rpm_lock); |
850 | ||
851 | list_for_each_entry(data, &owner->controllers, owner_node) { | |
852 | pm_runtime_get_noresume(data->sysmmu); | |
853 | if (pm_runtime_active(data->sysmmu)) | |
854 | __sysmmu_disable(data); | |
e1172300 MS |
855 | pm_runtime_put(data->sysmmu); |
856 | } | |
857 | ||
5fa61cbf MS |
858 | spin_lock_irqsave(&domain->lock, flags); |
859 | list_for_each_entry_safe(data, next, &domain->clients, domain_node) { | |
e1172300 | 860 | spin_lock(&data->lock); |
47a574ff MS |
861 | data->pgtable = 0; |
862 | data->domain = NULL; | |
b0d4c861 | 863 | list_del_init(&data->domain_node); |
e1172300 | 864 | spin_unlock(&data->lock); |
5fa61cbf | 865 | } |
e1172300 | 866 | owner->domain = NULL; |
5fa61cbf MS |
867 | spin_unlock_irqrestore(&domain->lock, flags); |
868 | ||
9b265536 | 869 | mutex_unlock(&owner->rpm_lock); |
5fa61cbf | 870 | |
b0d4c861 MS |
871 | dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", __func__, |
872 | &pagetable); | |
5fa61cbf MS |
873 | } |
874 | ||
bfa00489 | 875 | static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, |
2a96536e KC |
876 | struct device *dev) |
877 | { | |
6b21a5db | 878 | struct exynos_iommu_owner *owner = dev->archdata.iommu; |
bfa00489 | 879 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
469acebe | 880 | struct sysmmu_drvdata *data; |
bfa00489 | 881 | phys_addr_t pagetable = virt_to_phys(domain->pgtable); |
2a96536e | 882 | unsigned long flags; |
2a96536e | 883 | |
469acebe MS |
884 | if (!has_sysmmu(dev)) |
885 | return -ENODEV; | |
2a96536e | 886 | |
5fa61cbf MS |
887 | if (owner->domain) |
888 | exynos_iommu_detach_device(owner->domain, dev); | |
889 | ||
9b265536 MS |
890 | mutex_lock(&owner->rpm_lock); |
891 | ||
e1172300 | 892 | spin_lock_irqsave(&domain->lock, flags); |
1b092054 | 893 | list_for_each_entry(data, &owner->controllers, owner_node) { |
e1172300 | 894 | spin_lock(&data->lock); |
47a574ff MS |
895 | data->pgtable = pagetable; |
896 | data->domain = domain; | |
e1172300 MS |
897 | list_add_tail(&data->domain_node, &domain->clients); |
898 | spin_unlock(&data->lock); | |
899 | } | |
900 | owner->domain = iommu_domain; | |
901 | spin_unlock_irqrestore(&domain->lock, flags); | |
902 | ||
9b265536 MS |
903 | list_for_each_entry(data, &owner->controllers, owner_node) { |
904 | pm_runtime_get_noresume(data->sysmmu); | |
905 | if (pm_runtime_active(data->sysmmu)) | |
906 | __sysmmu_enable(data); | |
907 | pm_runtime_put(data->sysmmu); | |
908 | } | |
909 | ||
910 | mutex_unlock(&owner->rpm_lock); | |
911 | ||
b0d4c861 MS |
912 | dev_dbg(dev, "%s: Attached IOMMU with pgtable %pa\n", __func__, |
913 | &pagetable); | |
7222e8db | 914 | |
b0d4c861 | 915 | return 0; |
2a96536e KC |
916 | } |
917 | ||
bfa00489 | 918 | static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *domain, |
66a7ed84 | 919 | sysmmu_pte_t *sent, sysmmu_iova_t iova, short *pgcounter) |
2a96536e | 920 | { |
61128f08 | 921 | if (lv1ent_section(sent)) { |
d09d78fc | 922 | WARN(1, "Trying mapping on %#08x mapped with 1MiB page", iova); |
61128f08 CK |
923 | return ERR_PTR(-EADDRINUSE); |
924 | } | |
925 | ||
2a96536e | 926 | if (lv1ent_fault(sent)) { |
0d6d3da4 | 927 | dma_addr_t handle; |
d09d78fc | 928 | sysmmu_pte_t *pent; |
66a7ed84 | 929 | bool need_flush_flpd_cache = lv1ent_zero(sent); |
2a96536e | 930 | |
734c3c73 | 931 | pent = kmem_cache_zalloc(lv2table_kmem_cache, GFP_ATOMIC); |
dbf6c6ef | 932 | BUG_ON((uintptr_t)pent & (LV2TABLE_SIZE - 1)); |
2a96536e | 933 | if (!pent) |
61128f08 | 934 | return ERR_PTR(-ENOMEM); |
2a96536e | 935 | |
5e3435eb | 936 | update_pte(sent, mk_lv1ent_page(virt_to_phys(pent))); |
dc3814f4 | 937 | kmemleak_ignore(pent); |
2a96536e | 938 | *pgcounter = NUM_LV2ENTRIES; |
0d6d3da4 MS |
939 | handle = dma_map_single(dma_dev, pent, LV2TABLE_SIZE, |
940 | DMA_TO_DEVICE); | |
941 | if (dma_mapping_error(dma_dev, handle)) { | |
942 | kmem_cache_free(lv2table_kmem_cache, pent); | |
943 | return ERR_PTR(-EADDRINUSE); | |
944 | } | |
66a7ed84 CK |
945 | |
946 | /* | |
f171abab SK |
947 | * If pre-fetched SLPD is a faulty SLPD in zero_l2_table, |
948 | * FLPD cache may cache the address of zero_l2_table. This | |
949 | * function replaces the zero_l2_table with new L2 page table | |
950 | * to write valid mappings. | |
66a7ed84 | 951 | * Accessing the valid area may cause page fault since FLPD |
f171abab SK |
952 | * cache may still cache zero_l2_table for the valid area |
953 | * instead of new L2 page table that has the mapping | |
954 | * information of the valid area. | |
66a7ed84 CK |
955 | * Thus any replacement of zero_l2_table with other valid L2 |
956 | * page table must involve FLPD cache invalidation for System | |
957 | * MMU v3.3. | |
958 | * FLPD cache invalidation is performed with TLB invalidation | |
959 | * by VPN without blocking. It is safe to invalidate TLB without | |
960 | * blocking because the target address of TLB invalidation is | |
961 | * not currently mapped. | |
962 | */ | |
963 | if (need_flush_flpd_cache) { | |
469acebe | 964 | struct sysmmu_drvdata *data; |
365409db | 965 | |
bfa00489 MS |
966 | spin_lock(&domain->lock); |
967 | list_for_each_entry(data, &domain->clients, domain_node) | |
469acebe | 968 | sysmmu_tlb_invalidate_flpdcache(data, iova); |
bfa00489 | 969 | spin_unlock(&domain->lock); |
66a7ed84 | 970 | } |
2a96536e KC |
971 | } |
972 | ||
973 | return page_entry(sent, iova); | |
974 | } | |
975 | ||
bfa00489 | 976 | static int lv1set_section(struct exynos_iommu_domain *domain, |
66a7ed84 | 977 | sysmmu_pte_t *sent, sysmmu_iova_t iova, |
1a0d8dac | 978 | phys_addr_t paddr, int prot, short *pgcnt) |
2a96536e | 979 | { |
61128f08 | 980 | if (lv1ent_section(sent)) { |
d09d78fc | 981 | WARN(1, "Trying mapping on 1MiB@%#08x that is mapped", |
61128f08 | 982 | iova); |
2a96536e | 983 | return -EADDRINUSE; |
61128f08 | 984 | } |
2a96536e KC |
985 | |
986 | if (lv1ent_page(sent)) { | |
61128f08 | 987 | if (*pgcnt != NUM_LV2ENTRIES) { |
d09d78fc | 988 | WARN(1, "Trying mapping on 1MiB@%#08x that is mapped", |
61128f08 | 989 | iova); |
2a96536e | 990 | return -EADDRINUSE; |
61128f08 | 991 | } |
2a96536e | 992 | |
734c3c73 | 993 | kmem_cache_free(lv2table_kmem_cache, page_entry(sent, 0)); |
2a96536e KC |
994 | *pgcnt = 0; |
995 | } | |
996 | ||
1a0d8dac | 997 | update_pte(sent, mk_lv1ent_sect(paddr, prot)); |
2a96536e | 998 | |
bfa00489 | 999 | spin_lock(&domain->lock); |
66a7ed84 | 1000 | if (lv1ent_page_zero(sent)) { |
469acebe | 1001 | struct sysmmu_drvdata *data; |
66a7ed84 CK |
1002 | /* |
1003 | * Flushing FLPD cache in System MMU v3.3 that may cache a FLPD | |
1004 | * entry by speculative prefetch of SLPD which has no mapping. | |
1005 | */ | |
bfa00489 | 1006 | list_for_each_entry(data, &domain->clients, domain_node) |
469acebe | 1007 | sysmmu_tlb_invalidate_flpdcache(data, iova); |
66a7ed84 | 1008 | } |
bfa00489 | 1009 | spin_unlock(&domain->lock); |
66a7ed84 | 1010 | |
2a96536e KC |
1011 | return 0; |
1012 | } | |
1013 | ||
d09d78fc | 1014 | static int lv2set_page(sysmmu_pte_t *pent, phys_addr_t paddr, size_t size, |
1a0d8dac | 1015 | int prot, short *pgcnt) |
2a96536e KC |
1016 | { |
1017 | if (size == SPAGE_SIZE) { | |
0bf4e54d | 1018 | if (WARN_ON(!lv2ent_fault(pent))) |
2a96536e KC |
1019 | return -EADDRINUSE; |
1020 | ||
1a0d8dac | 1021 | update_pte(pent, mk_lv2ent_spage(paddr, prot)); |
2a96536e KC |
1022 | *pgcnt -= 1; |
1023 | } else { /* size == LPAGE_SIZE */ | |
1024 | int i; | |
5e3435eb | 1025 | dma_addr_t pent_base = virt_to_phys(pent); |
365409db | 1026 | |
5e3435eb MS |
1027 | dma_sync_single_for_cpu(dma_dev, pent_base, |
1028 | sizeof(*pent) * SPAGES_PER_LPAGE, | |
1029 | DMA_TO_DEVICE); | |
2a96536e | 1030 | for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) { |
0bf4e54d | 1031 | if (WARN_ON(!lv2ent_fault(pent))) { |
61128f08 CK |
1032 | if (i > 0) |
1033 | memset(pent - i, 0, sizeof(*pent) * i); | |
2a96536e KC |
1034 | return -EADDRINUSE; |
1035 | } | |
1036 | ||
1a0d8dac | 1037 | *pent = mk_lv2ent_lpage(paddr, prot); |
2a96536e | 1038 | } |
5e3435eb MS |
1039 | dma_sync_single_for_device(dma_dev, pent_base, |
1040 | sizeof(*pent) * SPAGES_PER_LPAGE, | |
1041 | DMA_TO_DEVICE); | |
2a96536e KC |
1042 | *pgcnt -= SPAGES_PER_LPAGE; |
1043 | } | |
1044 | ||
1045 | return 0; | |
1046 | } | |
1047 | ||
66a7ed84 CK |
1048 | /* |
1049 | * *CAUTION* to the I/O virtual memory managers that support exynos-iommu: | |
1050 | * | |
f171abab | 1051 | * System MMU v3.x has advanced logic to improve address translation |
66a7ed84 | 1052 | * performance with caching more page table entries by a page table walk. |
f171abab SK |
1053 | * However, the logic has a bug that while caching faulty page table entries, |
1054 | * System MMU reports page fault if the cached fault entry is hit even though | |
1055 | * the fault entry is updated to a valid entry after the entry is cached. | |
1056 | * To prevent caching faulty page table entries which may be updated to valid | |
1057 | * entries later, the virtual memory manager should care about the workaround | |
1058 | * for the problem. The following describes the workaround. | |
66a7ed84 CK |
1059 | * |
1060 | * Any two consecutive I/O virtual address regions must have a hole of 128KiB | |
f171abab | 1061 | * at maximum to prevent misbehavior of System MMU 3.x (workaround for h/w bug). |
66a7ed84 | 1062 | * |
f171abab | 1063 | * Precisely, any start address of I/O virtual region must be aligned with |
66a7ed84 CK |
1064 | * the following sizes for System MMU v3.1 and v3.2. |
1065 | * System MMU v3.1: 128KiB | |
1066 | * System MMU v3.2: 256KiB | |
1067 | * | |
1068 | * Because System MMU v3.3 caches page table entries more aggressively, it needs | |
f171abab SK |
1069 | * more workarounds. |
1070 | * - Any two consecutive I/O virtual regions must have a hole of size larger | |
1071 | * than or equal to 128KiB. | |
66a7ed84 CK |
1072 | * - Start address of an I/O virtual region must be aligned by 128KiB. |
1073 | */ | |
bfa00489 MS |
1074 | static int exynos_iommu_map(struct iommu_domain *iommu_domain, |
1075 | unsigned long l_iova, phys_addr_t paddr, size_t size, | |
1076 | int prot) | |
2a96536e | 1077 | { |
bfa00489 | 1078 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
d09d78fc CK |
1079 | sysmmu_pte_t *entry; |
1080 | sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; | |
2a96536e KC |
1081 | unsigned long flags; |
1082 | int ret = -ENOMEM; | |
1083 | ||
bfa00489 | 1084 | BUG_ON(domain->pgtable == NULL); |
1a0d8dac | 1085 | prot &= SYSMMU_SUPPORTED_PROT_BITS; |
2a96536e | 1086 | |
bfa00489 | 1087 | spin_lock_irqsave(&domain->pgtablelock, flags); |
2a96536e | 1088 | |
bfa00489 | 1089 | entry = section_entry(domain->pgtable, iova); |
2a96536e KC |
1090 | |
1091 | if (size == SECT_SIZE) { | |
1a0d8dac | 1092 | ret = lv1set_section(domain, entry, iova, paddr, prot, |
bfa00489 | 1093 | &domain->lv2entcnt[lv1ent_offset(iova)]); |
2a96536e | 1094 | } else { |
d09d78fc | 1095 | sysmmu_pte_t *pent; |
2a96536e | 1096 | |
bfa00489 MS |
1097 | pent = alloc_lv2entry(domain, entry, iova, |
1098 | &domain->lv2entcnt[lv1ent_offset(iova)]); | |
2a96536e | 1099 | |
61128f08 CK |
1100 | if (IS_ERR(pent)) |
1101 | ret = PTR_ERR(pent); | |
2a96536e | 1102 | else |
1a0d8dac | 1103 | ret = lv2set_page(pent, paddr, size, prot, |
bfa00489 | 1104 | &domain->lv2entcnt[lv1ent_offset(iova)]); |
2a96536e KC |
1105 | } |
1106 | ||
61128f08 | 1107 | if (ret) |
0bf4e54d CK |
1108 | pr_err("%s: Failed(%d) to map %#zx bytes @ %#x\n", |
1109 | __func__, ret, size, iova); | |
2a96536e | 1110 | |
bfa00489 | 1111 | spin_unlock_irqrestore(&domain->pgtablelock, flags); |
2a96536e KC |
1112 | |
1113 | return ret; | |
1114 | } | |
1115 | ||
bfa00489 MS |
1116 | static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *domain, |
1117 | sysmmu_iova_t iova, size_t size) | |
66a7ed84 | 1118 | { |
469acebe | 1119 | struct sysmmu_drvdata *data; |
66a7ed84 CK |
1120 | unsigned long flags; |
1121 | ||
bfa00489 | 1122 | spin_lock_irqsave(&domain->lock, flags); |
66a7ed84 | 1123 | |
bfa00489 | 1124 | list_for_each_entry(data, &domain->clients, domain_node) |
469acebe | 1125 | sysmmu_tlb_invalidate_entry(data, iova, size); |
66a7ed84 | 1126 | |
bfa00489 | 1127 | spin_unlock_irqrestore(&domain->lock, flags); |
66a7ed84 CK |
1128 | } |
1129 | ||
bfa00489 MS |
1130 | static size_t exynos_iommu_unmap(struct iommu_domain *iommu_domain, |
1131 | unsigned long l_iova, size_t size) | |
2a96536e | 1132 | { |
bfa00489 | 1133 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
d09d78fc CK |
1134 | sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; |
1135 | sysmmu_pte_t *ent; | |
61128f08 | 1136 | size_t err_pgsize; |
d09d78fc | 1137 | unsigned long flags; |
2a96536e | 1138 | |
bfa00489 | 1139 | BUG_ON(domain->pgtable == NULL); |
2a96536e | 1140 | |
bfa00489 | 1141 | spin_lock_irqsave(&domain->pgtablelock, flags); |
2a96536e | 1142 | |
bfa00489 | 1143 | ent = section_entry(domain->pgtable, iova); |
2a96536e KC |
1144 | |
1145 | if (lv1ent_section(ent)) { | |
0bf4e54d | 1146 | if (WARN_ON(size < SECT_SIZE)) { |
61128f08 CK |
1147 | err_pgsize = SECT_SIZE; |
1148 | goto err; | |
1149 | } | |
2a96536e | 1150 | |
f171abab | 1151 | /* workaround for h/w bug in System MMU v3.3 */ |
5e3435eb | 1152 | update_pte(ent, ZERO_LV2LINK); |
2a96536e KC |
1153 | size = SECT_SIZE; |
1154 | goto done; | |
1155 | } | |
1156 | ||
1157 | if (unlikely(lv1ent_fault(ent))) { | |
1158 | if (size > SECT_SIZE) | |
1159 | size = SECT_SIZE; | |
1160 | goto done; | |
1161 | } | |
1162 | ||
1163 | /* lv1ent_page(sent) == true here */ | |
1164 | ||
1165 | ent = page_entry(ent, iova); | |
1166 | ||
1167 | if (unlikely(lv2ent_fault(ent))) { | |
1168 | size = SPAGE_SIZE; | |
1169 | goto done; | |
1170 | } | |
1171 | ||
1172 | if (lv2ent_small(ent)) { | |
5e3435eb | 1173 | update_pte(ent, 0); |
2a96536e | 1174 | size = SPAGE_SIZE; |
bfa00489 | 1175 | domain->lv2entcnt[lv1ent_offset(iova)] += 1; |
2a96536e KC |
1176 | goto done; |
1177 | } | |
1178 | ||
1179 | /* lv1ent_large(ent) == true here */ | |
0bf4e54d | 1180 | if (WARN_ON(size < LPAGE_SIZE)) { |
61128f08 CK |
1181 | err_pgsize = LPAGE_SIZE; |
1182 | goto err; | |
1183 | } | |
2a96536e | 1184 | |
5e3435eb MS |
1185 | dma_sync_single_for_cpu(dma_dev, virt_to_phys(ent), |
1186 | sizeof(*ent) * SPAGES_PER_LPAGE, | |
1187 | DMA_TO_DEVICE); | |
2a96536e | 1188 | memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE); |
5e3435eb MS |
1189 | dma_sync_single_for_device(dma_dev, virt_to_phys(ent), |
1190 | sizeof(*ent) * SPAGES_PER_LPAGE, | |
1191 | DMA_TO_DEVICE); | |
2a96536e | 1192 | size = LPAGE_SIZE; |
bfa00489 | 1193 | domain->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; |
2a96536e | 1194 | done: |
bfa00489 | 1195 | spin_unlock_irqrestore(&domain->pgtablelock, flags); |
2a96536e | 1196 | |
bfa00489 | 1197 | exynos_iommu_tlb_invalidate_entry(domain, iova, size); |
2a96536e | 1198 | |
2a96536e | 1199 | return size; |
61128f08 | 1200 | err: |
bfa00489 | 1201 | spin_unlock_irqrestore(&domain->pgtablelock, flags); |
61128f08 | 1202 | |
0bf4e54d CK |
1203 | pr_err("%s: Failed: size(%#zx) @ %#x is smaller than page size %#zx\n", |
1204 | __func__, size, iova, err_pgsize); | |
61128f08 CK |
1205 | |
1206 | return 0; | |
2a96536e KC |
1207 | } |
1208 | ||
bfa00489 | 1209 | static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *iommu_domain, |
bb5547ac | 1210 | dma_addr_t iova) |
2a96536e | 1211 | { |
bfa00489 | 1212 | struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); |
d09d78fc | 1213 | sysmmu_pte_t *entry; |
2a96536e KC |
1214 | unsigned long flags; |
1215 | phys_addr_t phys = 0; | |
1216 | ||
bfa00489 | 1217 | spin_lock_irqsave(&domain->pgtablelock, flags); |
2a96536e | 1218 | |
bfa00489 | 1219 | entry = section_entry(domain->pgtable, iova); |
2a96536e KC |
1220 | |
1221 | if (lv1ent_section(entry)) { | |
1222 | phys = section_phys(entry) + section_offs(iova); | |
1223 | } else if (lv1ent_page(entry)) { | |
1224 | entry = page_entry(entry, iova); | |
1225 | ||
1226 | if (lv2ent_large(entry)) | |
1227 | phys = lpage_phys(entry) + lpage_offs(iova); | |
1228 | else if (lv2ent_small(entry)) | |
1229 | phys = spage_phys(entry) + spage_offs(iova); | |
1230 | } | |
1231 | ||
bfa00489 | 1232 | spin_unlock_irqrestore(&domain->pgtablelock, flags); |
2a96536e KC |
1233 | |
1234 | return phys; | |
1235 | } | |
1236 | ||
6c2ae7e2 MS |
1237 | static struct iommu_group *get_device_iommu_group(struct device *dev) |
1238 | { | |
1239 | struct iommu_group *group; | |
1240 | ||
1241 | group = iommu_group_get(dev); | |
1242 | if (!group) | |
1243 | group = iommu_group_alloc(); | |
1244 | ||
1245 | return group; | |
1246 | } | |
1247 | ||
bf4a1c92 AM |
1248 | static int exynos_iommu_add_device(struct device *dev) |
1249 | { | |
1250 | struct iommu_group *group; | |
bf4a1c92 | 1251 | |
06801db0 MS |
1252 | if (!has_sysmmu(dev)) |
1253 | return -ENODEV; | |
1254 | ||
6c2ae7e2 | 1255 | group = iommu_group_get_for_dev(dev); |
bf4a1c92 | 1256 | |
6c2ae7e2 MS |
1257 | if (IS_ERR(group)) |
1258 | return PTR_ERR(group); | |
bf4a1c92 | 1259 | |
bf4a1c92 AM |
1260 | iommu_group_put(group); |
1261 | ||
6c2ae7e2 | 1262 | return 0; |
bf4a1c92 AM |
1263 | } |
1264 | ||
1265 | static void exynos_iommu_remove_device(struct device *dev) | |
1266 | { | |
fff2fd1a MS |
1267 | struct exynos_iommu_owner *owner = dev->archdata.iommu; |
1268 | ||
06801db0 MS |
1269 | if (!has_sysmmu(dev)) |
1270 | return; | |
1271 | ||
fff2fd1a MS |
1272 | if (owner->domain) { |
1273 | struct iommu_group *group = iommu_group_get(dev); | |
1274 | ||
1275 | if (group) { | |
1276 | WARN_ON(owner->domain != | |
1277 | iommu_group_default_domain(group)); | |
1278 | exynos_iommu_detach_device(owner->domain, dev); | |
1279 | iommu_group_put(group); | |
1280 | } | |
1281 | } | |
bf4a1c92 AM |
1282 | iommu_group_remove_device(dev); |
1283 | } | |
1284 | ||
aa759fd3 MS |
1285 | static int exynos_iommu_of_xlate(struct device *dev, |
1286 | struct of_phandle_args *spec) | |
1287 | { | |
1288 | struct exynos_iommu_owner *owner = dev->archdata.iommu; | |
1289 | struct platform_device *sysmmu = of_find_device_by_node(spec->np); | |
0bd5a0c7 | 1290 | struct sysmmu_drvdata *data, *entry; |
aa759fd3 MS |
1291 | |
1292 | if (!sysmmu) | |
1293 | return -ENODEV; | |
1294 | ||
1295 | data = platform_get_drvdata(sysmmu); | |
1296 | if (!data) | |
1297 | return -ENODEV; | |
1298 | ||
1299 | if (!owner) { | |
1300 | owner = kzalloc(sizeof(*owner), GFP_KERNEL); | |
1301 | if (!owner) | |
1302 | return -ENOMEM; | |
1303 | ||
1304 | INIT_LIST_HEAD(&owner->controllers); | |
9b265536 | 1305 | mutex_init(&owner->rpm_lock); |
aa759fd3 MS |
1306 | dev->archdata.iommu = owner; |
1307 | } | |
1308 | ||
0bd5a0c7 MS |
1309 | list_for_each_entry(entry, &owner->controllers, owner_node) |
1310 | if (entry == data) | |
1311 | return 0; | |
1312 | ||
aa759fd3 | 1313 | list_add_tail(&data->owner_node, &owner->controllers); |
92798b45 | 1314 | data->master = dev; |
2f5f44f2 MS |
1315 | |
1316 | /* | |
1317 | * SYSMMU will be runtime activated via device link (dependency) to its | |
1318 | * master device, so there are no direct calls to pm_runtime_get/put | |
1319 | * in this driver. | |
1320 | */ | |
1321 | device_link_add(dev, data->sysmmu, DL_FLAG_PM_RUNTIME); | |
1322 | ||
aa759fd3 MS |
1323 | return 0; |
1324 | } | |
1325 | ||
8ed55c81 | 1326 | static struct iommu_ops exynos_iommu_ops = { |
e1fd1eaa JR |
1327 | .domain_alloc = exynos_iommu_domain_alloc, |
1328 | .domain_free = exynos_iommu_domain_free, | |
ba5fa6f6 BH |
1329 | .attach_dev = exynos_iommu_attach_device, |
1330 | .detach_dev = exynos_iommu_detach_device, | |
1331 | .map = exynos_iommu_map, | |
1332 | .unmap = exynos_iommu_unmap, | |
315786eb | 1333 | .map_sg = default_iommu_map_sg, |
ba5fa6f6 | 1334 | .iova_to_phys = exynos_iommu_iova_to_phys, |
6c2ae7e2 | 1335 | .device_group = get_device_iommu_group, |
ba5fa6f6 BH |
1336 | .add_device = exynos_iommu_add_device, |
1337 | .remove_device = exynos_iommu_remove_device, | |
2a96536e | 1338 | .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE, |
aa759fd3 | 1339 | .of_xlate = exynos_iommu_of_xlate, |
2a96536e KC |
1340 | }; |
1341 | ||
8ed55c81 MS |
1342 | static bool init_done; |
1343 | ||
2a96536e KC |
1344 | static int __init exynos_iommu_init(void) |
1345 | { | |
1346 | int ret; | |
1347 | ||
734c3c73 CK |
1348 | lv2table_kmem_cache = kmem_cache_create("exynos-iommu-lv2table", |
1349 | LV2TABLE_SIZE, LV2TABLE_SIZE, 0, NULL); | |
1350 | if (!lv2table_kmem_cache) { | |
1351 | pr_err("%s: Failed to create kmem cache\n", __func__); | |
1352 | return -ENOMEM; | |
1353 | } | |
1354 | ||
2a96536e | 1355 | ret = platform_driver_register(&exynos_sysmmu_driver); |
734c3c73 CK |
1356 | if (ret) { |
1357 | pr_err("%s: Failed to register driver\n", __func__); | |
1358 | goto err_reg_driver; | |
1359 | } | |
2a96536e | 1360 | |
66a7ed84 CK |
1361 | zero_lv2_table = kmem_cache_zalloc(lv2table_kmem_cache, GFP_KERNEL); |
1362 | if (zero_lv2_table == NULL) { | |
1363 | pr_err("%s: Failed to allocate zero level2 page table\n", | |
1364 | __func__); | |
1365 | ret = -ENOMEM; | |
1366 | goto err_zero_lv2; | |
1367 | } | |
1368 | ||
734c3c73 CK |
1369 | ret = bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); |
1370 | if (ret) { | |
1371 | pr_err("%s: Failed to register exynos-iommu driver.\n", | |
1372 | __func__); | |
1373 | goto err_set_iommu; | |
1374 | } | |
2a96536e | 1375 | |
8ed55c81 MS |
1376 | init_done = true; |
1377 | ||
734c3c73 CK |
1378 | return 0; |
1379 | err_set_iommu: | |
66a7ed84 CK |
1380 | kmem_cache_free(lv2table_kmem_cache, zero_lv2_table); |
1381 | err_zero_lv2: | |
734c3c73 CK |
1382 | platform_driver_unregister(&exynos_sysmmu_driver); |
1383 | err_reg_driver: | |
1384 | kmem_cache_destroy(lv2table_kmem_cache); | |
2a96536e KC |
1385 | return ret; |
1386 | } | |
8ed55c81 MS |
1387 | |
1388 | static int __init exynos_iommu_of_setup(struct device_node *np) | |
1389 | { | |
1390 | struct platform_device *pdev; | |
1391 | ||
1392 | if (!init_done) | |
1393 | exynos_iommu_init(); | |
1394 | ||
1395 | pdev = of_platform_device_create(np, NULL, platform_bus_type.dev_root); | |
423595e8 AKC |
1396 | if (!pdev) |
1397 | return -ENODEV; | |
8ed55c81 | 1398 | |
5e3435eb MS |
1399 | /* |
1400 | * use the first registered sysmmu device for performing | |
1401 | * dma mapping operations on iommu page tables (cpu cache flush) | |
1402 | */ | |
1403 | if (!dma_dev) | |
1404 | dma_dev = &pdev->dev; | |
1405 | ||
8ed55c81 MS |
1406 | return 0; |
1407 | } | |
1408 | ||
1409 | IOMMU_OF_DECLARE(exynos_iommu_of, "samsung,exynos-sysmmu", | |
1410 | exynos_iommu_of_setup); |