1 // SPDX-License-Identifier: GPL-2.0-only
3 * IOMMU API for Rockchip
10 #include <linux/compiler.h>
11 #include <linux/delay.h>
12 #include <linux/device.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/errno.h>
15 #include <linux/interrupt.h>
17 #include <linux/iommu.h>
18 #include <linux/iopoll.h>
19 #include <linux/list.h>
21 #include <linux/init.h>
23 #include <linux/of_platform.h>
24 #include <linux/platform_device.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
29 /** MMU register offsets */
30 #define RK_MMU_DTE_ADDR 0x00 /* Directory table address */
31 #define RK_MMU_STATUS 0x04
32 #define RK_MMU_COMMAND 0x08
33 #define RK_MMU_PAGE_FAULT_ADDR 0x0C /* IOVA of last page fault */
34 #define RK_MMU_ZAP_ONE_LINE 0x10 /* Shootdown one IOTLB entry */
35 #define RK_MMU_INT_RAWSTAT 0x14 /* IRQ status ignoring mask */
36 #define RK_MMU_INT_CLEAR 0x18 /* Acknowledge and re-arm irq */
37 #define RK_MMU_INT_MASK 0x1C /* IRQ enable */
38 #define RK_MMU_INT_STATUS 0x20 /* IRQ status after masking */
39 #define RK_MMU_AUTO_GATING 0x24
41 #define DTE_ADDR_DUMMY 0xCAFEBABE
43 #define RK_MMU_POLL_PERIOD_US 100
44 #define RK_MMU_FORCE_RESET_TIMEOUT_US 100000
45 #define RK_MMU_POLL_TIMEOUT_US 1000
47 /* RK_MMU_STATUS fields */
48 #define RK_MMU_STATUS_PAGING_ENABLED BIT(0)
49 #define RK_MMU_STATUS_PAGE_FAULT_ACTIVE BIT(1)
50 #define RK_MMU_STATUS_STALL_ACTIVE BIT(2)
51 #define RK_MMU_STATUS_IDLE BIT(3)
52 #define RK_MMU_STATUS_REPLAY_BUFFER_EMPTY BIT(4)
53 #define RK_MMU_STATUS_PAGE_FAULT_IS_WRITE BIT(5)
54 #define RK_MMU_STATUS_STALL_NOT_ACTIVE BIT(31)
56 /* RK_MMU_COMMAND command values */
57 #define RK_MMU_CMD_ENABLE_PAGING 0 /* Enable memory translation */
58 #define RK_MMU_CMD_DISABLE_PAGING 1 /* Disable memory translation */
59 #define RK_MMU_CMD_ENABLE_STALL 2 /* Stall paging to allow other cmds */
60 #define RK_MMU_CMD_DISABLE_STALL 3 /* Stop stall re-enables paging */
61 #define RK_MMU_CMD_ZAP_CACHE 4 /* Shoot down entire IOTLB */
62 #define RK_MMU_CMD_PAGE_FAULT_DONE 5 /* Clear page fault */
63 #define RK_MMU_CMD_FORCE_RESET 6 /* Reset all registers */
65 /* RK_MMU_INT_* register fields */
66 #define RK_MMU_IRQ_PAGE_FAULT 0x01 /* page fault */
67 #define RK_MMU_IRQ_BUS_ERROR 0x02 /* bus read error */
68 #define RK_MMU_IRQ_MASK (RK_MMU_IRQ_PAGE_FAULT | RK_MMU_IRQ_BUS_ERROR)
70 #define NUM_DT_ENTRIES 1024
71 #define NUM_PT_ENTRIES 1024
73 #define SPAGE_ORDER 12
74 #define SPAGE_SIZE (1 << SPAGE_ORDER)
77 * Support mapping any size that fits in one page table:
80 #define RK_IOMMU_PGSIZE_BITMAP 0x007ff000
82 struct rk_iommu_domain {
83 struct list_head iommus;
84 u32 *dt; /* page directory table */
86 spinlock_t iommus_lock; /* lock for iommus list */
87 spinlock_t dt_lock; /* lock for modifying page directory table */
89 struct iommu_domain domain;
92 /* list of clocks required by IOMMU */
93 static const char * const rk_iommu_clocks[] = {
98 phys_addr_t (*pt_address)(u32 dte);
99 u32 (*mk_dtentries)(dma_addr_t pt_dma);
100 u32 (*mk_ptentries)(phys_addr_t page, int prot);
101 phys_addr_t (*dte_addr_phys)(u32 addr);
102 u32 (*dma_addr_dte)(dma_addr_t dt_dma);
108 void __iomem **bases;
111 struct clk_bulk_data *clocks;
114 struct iommu_device iommu;
115 struct list_head node; /* entry in rk_iommu_domain.iommus */
116 struct iommu_domain *domain; /* domain to which iommu is attached */
117 struct iommu_group *group;
120 struct rk_iommudata {
121 struct device_link *link; /* runtime PM link from IOMMU to master */
122 struct rk_iommu *iommu;
125 static struct device *dma_dev;
126 static const struct rk_iommu_ops *rk_ops;
127 static struct iommu_domain rk_identity_domain;
129 static inline void rk_table_flush(struct rk_iommu_domain *dom, dma_addr_t dma,
132 size_t size = count * sizeof(u32); /* count of u32 entry */
134 dma_sync_single_for_device(dma_dev, dma, size, DMA_TO_DEVICE);
137 static struct rk_iommu_domain *to_rk_domain(struct iommu_domain *dom)
139 return container_of(dom, struct rk_iommu_domain, domain);
143 * The Rockchip rk3288 iommu uses a 2-level page table.
144 * The first level is the "Directory Table" (DT).
145 * The DT consists of 1024 4-byte Directory Table Entries (DTEs), each pointing
147 * The second level is the 1024 Page Tables (PT).
148 * Each PT consists of 1024 4-byte Page Table Entries (PTEs), each pointing to
149 * a 4 KB page of physical memory.
151 * The DT and each PT fits in a single 4 KB page (4-bytes * 1024 entries).
152 * Each iommu device has a MMU_DTE_ADDR register that contains the physical
153 * address of the start of the DT page.
155 * The structure of the page table is as follows:
158 * MMU_DTE_ADDR -> +-----+
164 * | | | PTE | -> +-----+
165 * +-----+ +-----+ | |
175 * Each DTE has a PT address and a valid bit:
176 * +---------------------+-----------+-+
177 * | PT address | Reserved |V|
178 * +---------------------+-----------+-+
179 * 31:12 - PT address (PTs always starts on a 4 KB boundary)
181 * 0 - 1 if PT @ PT address is valid
183 #define RK_DTE_PT_ADDRESS_MASK 0xfffff000
184 #define RK_DTE_PT_VALID BIT(0)
186 static inline phys_addr_t rk_dte_pt_address(u32 dte)
188 return (phys_addr_t)dte & RK_DTE_PT_ADDRESS_MASK;
193 * 31:12 - PT address bit 31:0
194 * 11: 8 - PT address bit 35:32
195 * 7: 4 - PT address bit 39:36
197 * 0 - 1 if PT @ PT address is valid
199 #define RK_DTE_PT_ADDRESS_MASK_V2 GENMASK_ULL(31, 4)
200 #define DTE_HI_MASK1 GENMASK(11, 8)
201 #define DTE_HI_MASK2 GENMASK(7, 4)
202 #define DTE_HI_SHIFT1 24 /* shift bit 8 to bit 32 */
203 #define DTE_HI_SHIFT2 32 /* shift bit 4 to bit 36 */
204 #define PAGE_DESC_HI_MASK1 GENMASK_ULL(35, 32)
205 #define PAGE_DESC_HI_MASK2 GENMASK_ULL(39, 36)
207 static inline phys_addr_t rk_dte_pt_address_v2(u32 dte)
211 dte_v2 = ((dte_v2 & DTE_HI_MASK2) << DTE_HI_SHIFT2) |
212 ((dte_v2 & DTE_HI_MASK1) << DTE_HI_SHIFT1) |
213 (dte_v2 & RK_DTE_PT_ADDRESS_MASK);
215 return (phys_addr_t)dte_v2;
218 static inline bool rk_dte_is_pt_valid(u32 dte)
220 return dte & RK_DTE_PT_VALID;
223 static inline u32 rk_mk_dte(dma_addr_t pt_dma)
225 return (pt_dma & RK_DTE_PT_ADDRESS_MASK) | RK_DTE_PT_VALID;
228 static inline u32 rk_mk_dte_v2(dma_addr_t pt_dma)
230 pt_dma = (pt_dma & RK_DTE_PT_ADDRESS_MASK) |
231 ((pt_dma & PAGE_DESC_HI_MASK1) >> DTE_HI_SHIFT1) |
232 (pt_dma & PAGE_DESC_HI_MASK2) >> DTE_HI_SHIFT2;
234 return (pt_dma & RK_DTE_PT_ADDRESS_MASK_V2) | RK_DTE_PT_VALID;
238 * Each PTE has a Page address, some flags and a valid bit:
239 * +---------------------+---+-------+-+
240 * | Page address |Rsv| Flags |V|
241 * +---------------------+---+-------+-+
242 * 31:12 - Page address (Pages always start on a 4 KB boundary)
245 * 8 - Read allocate - allocate cache space on read misses
246 * 7 - Read cache - enable cache & prefetch of data
247 * 6 - Write buffer - enable delaying writes on their way to memory
248 * 5 - Write allocate - allocate cache space on write misses
249 * 4 - Write cache - different writes can be merged together
250 * 3 - Override cache attributes
251 * if 1, bits 4-8 control cache attributes
252 * if 0, the system bus defaults are used
255 * 0 - 1 if Page @ Page address is valid
257 #define RK_PTE_PAGE_ADDRESS_MASK 0xfffff000
258 #define RK_PTE_PAGE_FLAGS_MASK 0x000001fe
259 #define RK_PTE_PAGE_WRITABLE BIT(2)
260 #define RK_PTE_PAGE_READABLE BIT(1)
261 #define RK_PTE_PAGE_VALID BIT(0)
263 static inline bool rk_pte_is_page_valid(u32 pte)
265 return pte & RK_PTE_PAGE_VALID;
268 /* TODO: set cache flags per prot IOMMU_CACHE */
269 static u32 rk_mk_pte(phys_addr_t page, int prot)
272 flags |= (prot & IOMMU_READ) ? RK_PTE_PAGE_READABLE : 0;
273 flags |= (prot & IOMMU_WRITE) ? RK_PTE_PAGE_WRITABLE : 0;
274 page &= RK_PTE_PAGE_ADDRESS_MASK;
275 return page | flags | RK_PTE_PAGE_VALID;
280 * 31:12 - Page address bit 31:0
281 * 11:9 - Page address bit 34:32
282 * 8:4 - Page address bit 39:35
286 * 0 - 1 if Page @ Page address is valid
289 static u32 rk_mk_pte_v2(phys_addr_t page, int prot)
293 flags |= (prot & IOMMU_READ) ? RK_PTE_PAGE_READABLE : 0;
294 flags |= (prot & IOMMU_WRITE) ? RK_PTE_PAGE_WRITABLE : 0;
296 return rk_mk_dte_v2(page) | flags;
299 static u32 rk_mk_pte_invalid(u32 pte)
301 return pte & ~RK_PTE_PAGE_VALID;
305 * rk3288 iova (IOMMU Virtual Address) format
307 * +-----------+-----------+-------------+
308 * | DTE index | PTE index | Page offset |
309 * +-----------+-----------+-------------+
310 * 31:22 - DTE index - index of DTE in DT
311 * 21:12 - PTE index - index of PTE in PT @ DTE.pt_address
312 * 11: 0 - Page offset - offset into page @ PTE.page_address
314 #define RK_IOVA_DTE_MASK 0xffc00000
315 #define RK_IOVA_DTE_SHIFT 22
316 #define RK_IOVA_PTE_MASK 0x003ff000
317 #define RK_IOVA_PTE_SHIFT 12
318 #define RK_IOVA_PAGE_MASK 0x00000fff
319 #define RK_IOVA_PAGE_SHIFT 0
321 static u32 rk_iova_dte_index(dma_addr_t iova)
323 return (u32)(iova & RK_IOVA_DTE_MASK) >> RK_IOVA_DTE_SHIFT;
326 static u32 rk_iova_pte_index(dma_addr_t iova)
328 return (u32)(iova & RK_IOVA_PTE_MASK) >> RK_IOVA_PTE_SHIFT;
331 static u32 rk_iova_page_offset(dma_addr_t iova)
333 return (u32)(iova & RK_IOVA_PAGE_MASK) >> RK_IOVA_PAGE_SHIFT;
336 static u32 rk_iommu_read(void __iomem *base, u32 offset)
338 return readl(base + offset);
341 static void rk_iommu_write(void __iomem *base, u32 offset, u32 value)
343 writel(value, base + offset);
346 static void rk_iommu_command(struct rk_iommu *iommu, u32 command)
350 for (i = 0; i < iommu->num_mmu; i++)
351 writel(command, iommu->bases[i] + RK_MMU_COMMAND);
354 static void rk_iommu_base_command(void __iomem *base, u32 command)
356 writel(command, base + RK_MMU_COMMAND);
358 static void rk_iommu_zap_lines(struct rk_iommu *iommu, dma_addr_t iova_start,
362 dma_addr_t iova_end = iova_start + size;
364 * TODO(djkurtz): Figure out when it is more efficient to shootdown the
365 * entire iotlb rather than iterate over individual iovas.
367 for (i = 0; i < iommu->num_mmu; i++) {
370 for (iova = iova_start; iova < iova_end; iova += SPAGE_SIZE)
371 rk_iommu_write(iommu->bases[i], RK_MMU_ZAP_ONE_LINE, iova);
375 static bool rk_iommu_is_stall_active(struct rk_iommu *iommu)
380 for (i = 0; i < iommu->num_mmu; i++)
381 active &= !!(rk_iommu_read(iommu->bases[i], RK_MMU_STATUS) &
382 RK_MMU_STATUS_STALL_ACTIVE);
387 static bool rk_iommu_is_paging_enabled(struct rk_iommu *iommu)
392 for (i = 0; i < iommu->num_mmu; i++)
393 enable &= !!(rk_iommu_read(iommu->bases[i], RK_MMU_STATUS) &
394 RK_MMU_STATUS_PAGING_ENABLED);
399 static bool rk_iommu_is_reset_done(struct rk_iommu *iommu)
404 for (i = 0; i < iommu->num_mmu; i++)
405 done &= rk_iommu_read(iommu->bases[i], RK_MMU_DTE_ADDR) == 0;
410 static int rk_iommu_enable_stall(struct rk_iommu *iommu)
415 if (rk_iommu_is_stall_active(iommu))
418 /* Stall can only be enabled if paging is enabled */
419 if (!rk_iommu_is_paging_enabled(iommu))
422 rk_iommu_command(iommu, RK_MMU_CMD_ENABLE_STALL);
424 ret = readx_poll_timeout(rk_iommu_is_stall_active, iommu, val,
425 val, RK_MMU_POLL_PERIOD_US,
426 RK_MMU_POLL_TIMEOUT_US);
428 for (i = 0; i < iommu->num_mmu; i++)
429 dev_err(iommu->dev, "Enable stall request timed out, status: %#08x\n",
430 rk_iommu_read(iommu->bases[i], RK_MMU_STATUS));
435 static int rk_iommu_disable_stall(struct rk_iommu *iommu)
440 if (!rk_iommu_is_stall_active(iommu))
443 rk_iommu_command(iommu, RK_MMU_CMD_DISABLE_STALL);
445 ret = readx_poll_timeout(rk_iommu_is_stall_active, iommu, val,
446 !val, RK_MMU_POLL_PERIOD_US,
447 RK_MMU_POLL_TIMEOUT_US);
449 for (i = 0; i < iommu->num_mmu; i++)
450 dev_err(iommu->dev, "Disable stall request timed out, status: %#08x\n",
451 rk_iommu_read(iommu->bases[i], RK_MMU_STATUS));
456 static int rk_iommu_enable_paging(struct rk_iommu *iommu)
461 if (rk_iommu_is_paging_enabled(iommu))
464 rk_iommu_command(iommu, RK_MMU_CMD_ENABLE_PAGING);
466 ret = readx_poll_timeout(rk_iommu_is_paging_enabled, iommu, val,
467 val, RK_MMU_POLL_PERIOD_US,
468 RK_MMU_POLL_TIMEOUT_US);
470 for (i = 0; i < iommu->num_mmu; i++)
471 dev_err(iommu->dev, "Enable paging request timed out, status: %#08x\n",
472 rk_iommu_read(iommu->bases[i], RK_MMU_STATUS));
477 static int rk_iommu_disable_paging(struct rk_iommu *iommu)
482 if (!rk_iommu_is_paging_enabled(iommu))
485 rk_iommu_command(iommu, RK_MMU_CMD_DISABLE_PAGING);
487 ret = readx_poll_timeout(rk_iommu_is_paging_enabled, iommu, val,
488 !val, RK_MMU_POLL_PERIOD_US,
489 RK_MMU_POLL_TIMEOUT_US);
491 for (i = 0; i < iommu->num_mmu; i++)
492 dev_err(iommu->dev, "Disable paging request timed out, status: %#08x\n",
493 rk_iommu_read(iommu->bases[i], RK_MMU_STATUS));
498 static int rk_iommu_force_reset(struct rk_iommu *iommu)
504 if (iommu->reset_disabled)
508 * Check if register DTE_ADDR is working by writing DTE_ADDR_DUMMY
509 * and verifying that upper 5 nybbles are read back.
511 for (i = 0; i < iommu->num_mmu; i++) {
512 dte_addr = rk_ops->pt_address(DTE_ADDR_DUMMY);
513 rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, dte_addr);
515 if (dte_addr != rk_iommu_read(iommu->bases[i], RK_MMU_DTE_ADDR)) {
516 dev_err(iommu->dev, "Error during raw reset. MMU_DTE_ADDR is not functioning\n");
521 rk_iommu_command(iommu, RK_MMU_CMD_FORCE_RESET);
523 ret = readx_poll_timeout(rk_iommu_is_reset_done, iommu, val,
524 val, RK_MMU_FORCE_RESET_TIMEOUT_US,
525 RK_MMU_POLL_TIMEOUT_US);
527 dev_err(iommu->dev, "FORCE_RESET command timed out\n");
534 static inline phys_addr_t rk_dte_addr_phys(u32 addr)
536 return (phys_addr_t)addr;
539 static inline u32 rk_dma_addr_dte(dma_addr_t dt_dma)
544 #define DT_HI_MASK GENMASK_ULL(39, 32)
545 #define DTE_BASE_HI_MASK GENMASK(11, 4)
548 static inline phys_addr_t rk_dte_addr_phys_v2(u32 addr)
551 return (phys_addr_t)(addr64 & RK_DTE_PT_ADDRESS_MASK) |
552 ((addr64 & DTE_BASE_HI_MASK) << DT_SHIFT);
555 static inline u32 rk_dma_addr_dte_v2(dma_addr_t dt_dma)
557 return (dt_dma & RK_DTE_PT_ADDRESS_MASK) |
558 ((dt_dma & DT_HI_MASK) >> DT_SHIFT);
561 static void log_iova(struct rk_iommu *iommu, int index, dma_addr_t iova)
563 void __iomem *base = iommu->bases[index];
564 u32 dte_index, pte_index, page_offset;
566 phys_addr_t mmu_dte_addr_phys, dte_addr_phys;
569 phys_addr_t pte_addr_phys = 0;
570 u32 *pte_addr = NULL;
572 phys_addr_t page_addr_phys = 0;
575 dte_index = rk_iova_dte_index(iova);
576 pte_index = rk_iova_pte_index(iova);
577 page_offset = rk_iova_page_offset(iova);
579 mmu_dte_addr = rk_iommu_read(base, RK_MMU_DTE_ADDR);
580 mmu_dte_addr_phys = rk_ops->dte_addr_phys(mmu_dte_addr);
582 dte_addr_phys = mmu_dte_addr_phys + (4 * dte_index);
583 dte_addr = phys_to_virt(dte_addr_phys);
586 if (!rk_dte_is_pt_valid(dte))
589 pte_addr_phys = rk_ops->pt_address(dte) + (pte_index * 4);
590 pte_addr = phys_to_virt(pte_addr_phys);
593 if (!rk_pte_is_page_valid(pte))
596 page_addr_phys = rk_ops->pt_address(pte) + page_offset;
597 page_flags = pte & RK_PTE_PAGE_FLAGS_MASK;
600 dev_err(iommu->dev, "iova = %pad: dte_index: %#03x pte_index: %#03x page_offset: %#03x\n",
601 &iova, dte_index, pte_index, page_offset);
602 dev_err(iommu->dev, "mmu_dte_addr: %pa dte@%pa: %#08x valid: %u pte@%pa: %#08x valid: %u page@%pa flags: %#03x\n",
603 &mmu_dte_addr_phys, &dte_addr_phys, dte,
604 rk_dte_is_pt_valid(dte), &pte_addr_phys, pte,
605 rk_pte_is_page_valid(pte), &page_addr_phys, page_flags);
608 static irqreturn_t rk_iommu_irq(int irq, void *dev_id)
610 struct rk_iommu *iommu = dev_id;
614 irqreturn_t ret = IRQ_NONE;
617 err = pm_runtime_get_if_in_use(iommu->dev);
618 if (!err || WARN_ON_ONCE(err < 0))
621 if (WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks)))
624 for (i = 0; i < iommu->num_mmu; i++) {
625 int_status = rk_iommu_read(iommu->bases[i], RK_MMU_INT_STATUS);
630 iova = rk_iommu_read(iommu->bases[i], RK_MMU_PAGE_FAULT_ADDR);
632 if (int_status & RK_MMU_IRQ_PAGE_FAULT) {
635 status = rk_iommu_read(iommu->bases[i], RK_MMU_STATUS);
636 flags = (status & RK_MMU_STATUS_PAGE_FAULT_IS_WRITE) ?
637 IOMMU_FAULT_WRITE : IOMMU_FAULT_READ;
639 dev_err(iommu->dev, "Page fault at %pad of type %s\n",
641 (flags == IOMMU_FAULT_WRITE) ? "write" : "read");
643 log_iova(iommu, i, iova);
646 * Report page fault to any installed handlers.
647 * Ignore the return code, though, since we always zap cache
648 * and clear the page fault anyway.
650 if (iommu->domain != &rk_identity_domain)
651 report_iommu_fault(iommu->domain, iommu->dev, iova,
654 dev_err(iommu->dev, "Page fault while iommu not attached to domain?\n");
656 rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_ZAP_CACHE);
657 rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_PAGE_FAULT_DONE);
660 if (int_status & RK_MMU_IRQ_BUS_ERROR)
661 dev_err(iommu->dev, "BUS_ERROR occurred at %pad\n", &iova);
663 if (int_status & ~RK_MMU_IRQ_MASK)
664 dev_err(iommu->dev, "unexpected int_status: %#08x\n",
667 rk_iommu_write(iommu->bases[i], RK_MMU_INT_CLEAR, int_status);
670 clk_bulk_disable(iommu->num_clocks, iommu->clocks);
673 pm_runtime_put(iommu->dev);
677 static phys_addr_t rk_iommu_iova_to_phys(struct iommu_domain *domain,
680 struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
682 phys_addr_t pt_phys, phys = 0;
686 spin_lock_irqsave(&rk_domain->dt_lock, flags);
688 dte = rk_domain->dt[rk_iova_dte_index(iova)];
689 if (!rk_dte_is_pt_valid(dte))
692 pt_phys = rk_ops->pt_address(dte);
693 page_table = (u32 *)phys_to_virt(pt_phys);
694 pte = page_table[rk_iova_pte_index(iova)];
695 if (!rk_pte_is_page_valid(pte))
698 phys = rk_ops->pt_address(pte) + rk_iova_page_offset(iova);
700 spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
705 static void rk_iommu_zap_iova(struct rk_iommu_domain *rk_domain,
706 dma_addr_t iova, size_t size)
708 struct list_head *pos;
711 /* shootdown these iova from all iommus using this domain */
712 spin_lock_irqsave(&rk_domain->iommus_lock, flags);
713 list_for_each(pos, &rk_domain->iommus) {
714 struct rk_iommu *iommu;
717 iommu = list_entry(pos, struct rk_iommu, node);
719 /* Only zap TLBs of IOMMUs that are powered on. */
720 ret = pm_runtime_get_if_in_use(iommu->dev);
721 if (WARN_ON_ONCE(ret < 0))
724 WARN_ON(clk_bulk_enable(iommu->num_clocks,
726 rk_iommu_zap_lines(iommu, iova, size);
727 clk_bulk_disable(iommu->num_clocks, iommu->clocks);
728 pm_runtime_put(iommu->dev);
731 spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
734 static void rk_iommu_zap_iova_first_last(struct rk_iommu_domain *rk_domain,
735 dma_addr_t iova, size_t size)
737 rk_iommu_zap_iova(rk_domain, iova, SPAGE_SIZE);
738 if (size > SPAGE_SIZE)
739 rk_iommu_zap_iova(rk_domain, iova + size - SPAGE_SIZE,
743 static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain,
746 u32 *page_table, *dte_addr;
751 assert_spin_locked(&rk_domain->dt_lock);
753 dte_index = rk_iova_dte_index(iova);
754 dte_addr = &rk_domain->dt[dte_index];
756 if (rk_dte_is_pt_valid(dte))
759 page_table = (u32 *)get_zeroed_page(GFP_ATOMIC | GFP_DMA32);
761 return ERR_PTR(-ENOMEM);
763 pt_dma = dma_map_single(dma_dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE);
764 if (dma_mapping_error(dma_dev, pt_dma)) {
765 dev_err(dma_dev, "DMA mapping error while allocating page table\n");
766 free_page((unsigned long)page_table);
767 return ERR_PTR(-ENOMEM);
770 dte = rk_ops->mk_dtentries(pt_dma);
773 rk_table_flush(rk_domain,
774 rk_domain->dt_dma + dte_index * sizeof(u32), 1);
776 pt_phys = rk_ops->pt_address(dte);
777 return (u32 *)phys_to_virt(pt_phys);
780 static size_t rk_iommu_unmap_iova(struct rk_iommu_domain *rk_domain,
781 u32 *pte_addr, dma_addr_t pte_dma,
784 unsigned int pte_count;
785 unsigned int pte_total = size / SPAGE_SIZE;
787 assert_spin_locked(&rk_domain->dt_lock);
789 for (pte_count = 0; pte_count < pte_total; pte_count++) {
790 u32 pte = pte_addr[pte_count];
791 if (!rk_pte_is_page_valid(pte))
794 pte_addr[pte_count] = rk_mk_pte_invalid(pte);
797 rk_table_flush(rk_domain, pte_dma, pte_count);
799 return pte_count * SPAGE_SIZE;
802 static int rk_iommu_map_iova(struct rk_iommu_domain *rk_domain, u32 *pte_addr,
803 dma_addr_t pte_dma, dma_addr_t iova,
804 phys_addr_t paddr, size_t size, int prot)
806 unsigned int pte_count;
807 unsigned int pte_total = size / SPAGE_SIZE;
808 phys_addr_t page_phys;
810 assert_spin_locked(&rk_domain->dt_lock);
812 for (pte_count = 0; pte_count < pte_total; pte_count++) {
813 u32 pte = pte_addr[pte_count];
815 if (rk_pte_is_page_valid(pte))
818 pte_addr[pte_count] = rk_ops->mk_ptentries(paddr, prot);
823 rk_table_flush(rk_domain, pte_dma, pte_total);
826 * Zap the first and last iova to evict from iotlb any previously
827 * mapped cachelines holding stale values for its dte and pte.
828 * We only zap the first and last iova, since only they could have
829 * dte or pte shared with an existing mapping.
831 rk_iommu_zap_iova_first_last(rk_domain, iova, size);
835 /* Unmap the range of iovas that we just mapped */
836 rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma,
837 pte_count * SPAGE_SIZE);
839 iova += pte_count * SPAGE_SIZE;
840 page_phys = rk_ops->pt_address(pte_addr[pte_count]);
841 pr_err("iova: %pad already mapped to %pa cannot remap to phys: %pa prot: %#x\n",
842 &iova, &page_phys, &paddr, prot);
847 static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova,
848 phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
850 struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
852 dma_addr_t pte_dma, iova = (dma_addr_t)_iova;
853 u32 *page_table, *pte_addr;
854 u32 dte_index, pte_index;
857 spin_lock_irqsave(&rk_domain->dt_lock, flags);
860 * pgsize_bitmap specifies iova sizes that fit in one page table
861 * (1024 4-KiB pages = 4 MiB).
862 * So, size will always be 4096 <= size <= 4194304.
863 * Since iommu_map() guarantees that both iova and size will be
864 * aligned, we will always only be mapping from a single dte here.
866 page_table = rk_dte_get_page_table(rk_domain, iova);
867 if (IS_ERR(page_table)) {
868 spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
869 return PTR_ERR(page_table);
872 dte_index = rk_domain->dt[rk_iova_dte_index(iova)];
873 pte_index = rk_iova_pte_index(iova);
874 pte_addr = &page_table[pte_index];
876 pte_dma = rk_ops->pt_address(dte_index) + pte_index * sizeof(u32);
877 ret = rk_iommu_map_iova(rk_domain, pte_addr, pte_dma, iova,
880 spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
885 static size_t rk_iommu_unmap(struct iommu_domain *domain, unsigned long _iova,
886 size_t size, struct iommu_iotlb_gather *gather)
888 struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
890 dma_addr_t pte_dma, iova = (dma_addr_t)_iova;
896 spin_lock_irqsave(&rk_domain->dt_lock, flags);
899 * pgsize_bitmap specifies iova sizes that fit in one page table
900 * (1024 4-KiB pages = 4 MiB).
901 * So, size will always be 4096 <= size <= 4194304.
902 * Since iommu_unmap() guarantees that both iova and size will be
903 * aligned, we will always only be unmapping from a single dte here.
905 dte = rk_domain->dt[rk_iova_dte_index(iova)];
906 /* Just return 0 if iova is unmapped */
907 if (!rk_dte_is_pt_valid(dte)) {
908 spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
912 pt_phys = rk_ops->pt_address(dte);
913 pte_addr = (u32 *)phys_to_virt(pt_phys) + rk_iova_pte_index(iova);
914 pte_dma = pt_phys + rk_iova_pte_index(iova) * sizeof(u32);
915 unmap_size = rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma, size);
917 spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
919 /* Shootdown iotlb entries for iova range that was just unmapped */
920 rk_iommu_zap_iova(rk_domain, iova, unmap_size);
925 static struct rk_iommu *rk_iommu_from_dev(struct device *dev)
927 struct rk_iommudata *data = dev_iommu_priv_get(dev);
929 return data ? data->iommu : NULL;
932 /* Must be called with iommu powered on and attached */
933 static void rk_iommu_disable(struct rk_iommu *iommu)
937 /* Ignore error while disabling, just keep going */
938 WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks));
939 rk_iommu_enable_stall(iommu);
940 rk_iommu_disable_paging(iommu);
941 for (i = 0; i < iommu->num_mmu; i++) {
942 rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, 0);
943 rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, 0);
945 rk_iommu_disable_stall(iommu);
946 clk_bulk_disable(iommu->num_clocks, iommu->clocks);
949 /* Must be called with iommu powered on and attached */
950 static int rk_iommu_enable(struct rk_iommu *iommu)
952 struct iommu_domain *domain = iommu->domain;
953 struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
956 ret = clk_bulk_enable(iommu->num_clocks, iommu->clocks);
960 ret = rk_iommu_enable_stall(iommu);
962 goto out_disable_clocks;
964 ret = rk_iommu_force_reset(iommu);
966 goto out_disable_stall;
968 for (i = 0; i < iommu->num_mmu; i++) {
969 rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR,
970 rk_ops->dma_addr_dte(rk_domain->dt_dma));
971 rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_ZAP_CACHE);
972 rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, RK_MMU_IRQ_MASK);
975 ret = rk_iommu_enable_paging(iommu);
978 rk_iommu_disable_stall(iommu);
980 clk_bulk_disable(iommu->num_clocks, iommu->clocks);
984 static int rk_iommu_identity_attach(struct iommu_domain *identity_domain,
987 struct rk_iommu *iommu;
988 struct rk_iommu_domain *rk_domain;
992 /* Allow 'virtual devices' (eg drm) to detach from domain */
993 iommu = rk_iommu_from_dev(dev);
997 rk_domain = to_rk_domain(iommu->domain);
999 dev_dbg(dev, "Detaching from iommu domain\n");
1001 if (iommu->domain == identity_domain)
1004 iommu->domain = identity_domain;
1006 spin_lock_irqsave(&rk_domain->iommus_lock, flags);
1007 list_del_init(&iommu->node);
1008 spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
1010 ret = pm_runtime_get_if_in_use(iommu->dev);
1011 WARN_ON_ONCE(ret < 0);
1013 rk_iommu_disable(iommu);
1014 pm_runtime_put(iommu->dev);
1020 static void rk_iommu_identity_free(struct iommu_domain *domain)
1024 static struct iommu_domain_ops rk_identity_ops = {
1025 .attach_dev = rk_iommu_identity_attach,
1026 .free = rk_iommu_identity_free,
1029 static struct iommu_domain rk_identity_domain = {
1030 .type = IOMMU_DOMAIN_IDENTITY,
1031 .ops = &rk_identity_ops,
1035 static void rk_iommu_set_platform_dma(struct device *dev)
1037 WARN_ON(rk_iommu_identity_attach(&rk_identity_domain, dev));
1041 static int rk_iommu_attach_device(struct iommu_domain *domain,
1044 struct rk_iommu *iommu;
1045 struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
1046 unsigned long flags;
1050 * Allow 'virtual devices' (e.g., drm) to attach to domain.
1051 * Such a device does not belong to an iommu group.
1053 iommu = rk_iommu_from_dev(dev);
1057 dev_dbg(dev, "Attaching to iommu domain\n");
1059 /* iommu already attached */
1060 if (iommu->domain == domain)
1063 ret = rk_iommu_identity_attach(&rk_identity_domain, dev);
1067 iommu->domain = domain;
1069 spin_lock_irqsave(&rk_domain->iommus_lock, flags);
1070 list_add_tail(&iommu->node, &rk_domain->iommus);
1071 spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
1073 ret = pm_runtime_get_if_in_use(iommu->dev);
1074 if (!ret || WARN_ON_ONCE(ret < 0))
1077 ret = rk_iommu_enable(iommu);
1079 WARN_ON(rk_iommu_identity_attach(&rk_identity_domain, dev));
1081 pm_runtime_put(iommu->dev);
1086 static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
1088 struct rk_iommu_domain *rk_domain;
1090 if (type == IOMMU_DOMAIN_IDENTITY)
1091 return &rk_identity_domain;
1093 if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
1099 rk_domain = kzalloc(sizeof(*rk_domain), GFP_KERNEL);
1104 * rk32xx iommus use a 2 level pagetable.
1105 * Each level1 (dt) and level2 (pt) table has 1024 4-byte entries.
1106 * Allocate one 4 KiB page for each table.
1108 rk_domain->dt = (u32 *)get_zeroed_page(GFP_KERNEL | GFP_DMA32);
1110 goto err_free_domain;
1112 rk_domain->dt_dma = dma_map_single(dma_dev, rk_domain->dt,
1113 SPAGE_SIZE, DMA_TO_DEVICE);
1114 if (dma_mapping_error(dma_dev, rk_domain->dt_dma)) {
1115 dev_err(dma_dev, "DMA map error for DT\n");
1119 spin_lock_init(&rk_domain->iommus_lock);
1120 spin_lock_init(&rk_domain->dt_lock);
1121 INIT_LIST_HEAD(&rk_domain->iommus);
1123 rk_domain->domain.geometry.aperture_start = 0;
1124 rk_domain->domain.geometry.aperture_end = DMA_BIT_MASK(32);
1125 rk_domain->domain.geometry.force_aperture = true;
1127 return &rk_domain->domain;
1130 free_page((unsigned long)rk_domain->dt);
1137 static void rk_iommu_domain_free(struct iommu_domain *domain)
1139 struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
1142 WARN_ON(!list_empty(&rk_domain->iommus));
1144 for (i = 0; i < NUM_DT_ENTRIES; i++) {
1145 u32 dte = rk_domain->dt[i];
1146 if (rk_dte_is_pt_valid(dte)) {
1147 phys_addr_t pt_phys = rk_ops->pt_address(dte);
1148 u32 *page_table = phys_to_virt(pt_phys);
1149 dma_unmap_single(dma_dev, pt_phys,
1150 SPAGE_SIZE, DMA_TO_DEVICE);
1151 free_page((unsigned long)page_table);
1155 dma_unmap_single(dma_dev, rk_domain->dt_dma,
1156 SPAGE_SIZE, DMA_TO_DEVICE);
1157 free_page((unsigned long)rk_domain->dt);
1162 static struct iommu_device *rk_iommu_probe_device(struct device *dev)
1164 struct rk_iommudata *data;
1165 struct rk_iommu *iommu;
1167 data = dev_iommu_priv_get(dev);
1169 return ERR_PTR(-ENODEV);
1171 iommu = rk_iommu_from_dev(dev);
1173 data->link = device_link_add(dev, iommu->dev,
1174 DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME);
1176 return &iommu->iommu;
1179 static void rk_iommu_release_device(struct device *dev)
1181 struct rk_iommudata *data = dev_iommu_priv_get(dev);
1183 device_link_del(data->link);
1186 static struct iommu_group *rk_iommu_device_group(struct device *dev)
1188 struct rk_iommu *iommu;
1190 iommu = rk_iommu_from_dev(dev);
1192 return iommu_group_ref_get(iommu->group);
1195 static int rk_iommu_of_xlate(struct device *dev,
1196 struct of_phandle_args *args)
1198 struct platform_device *iommu_dev;
1199 struct rk_iommudata *data;
1201 data = devm_kzalloc(dma_dev, sizeof(*data), GFP_KERNEL);
1205 iommu_dev = of_find_device_by_node(args->np);
1207 data->iommu = platform_get_drvdata(iommu_dev);
1208 data->iommu->domain = &rk_identity_domain;
1209 dev_iommu_priv_set(dev, data);
1211 platform_device_put(iommu_dev);
1216 static const struct iommu_ops rk_iommu_ops = {
1217 .domain_alloc = rk_iommu_domain_alloc,
1218 .probe_device = rk_iommu_probe_device,
1219 .release_device = rk_iommu_release_device,
1220 .device_group = rk_iommu_device_group,
1222 .set_platform_dma_ops = rk_iommu_set_platform_dma,
1224 .pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
1225 .of_xlate = rk_iommu_of_xlate,
1226 .default_domain_ops = &(const struct iommu_domain_ops) {
1227 .attach_dev = rk_iommu_attach_device,
1228 .map = rk_iommu_map,
1229 .unmap = rk_iommu_unmap,
1230 .iova_to_phys = rk_iommu_iova_to_phys,
1231 .free = rk_iommu_domain_free,
1235 static int rk_iommu_probe(struct platform_device *pdev)
1237 struct device *dev = &pdev->dev;
1238 struct rk_iommu *iommu;
1239 struct resource *res;
1240 const struct rk_iommu_ops *ops;
1241 int num_res = pdev->num_resources;
1244 iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL);
1248 platform_set_drvdata(pdev, iommu);
1252 ops = of_device_get_match_data(dev);
1257 * That should not happen unless different versions of the
1258 * hardware block are embedded the same SoC
1260 if (WARN_ON(rk_ops != ops))
1263 iommu->bases = devm_kcalloc(dev, num_res, sizeof(*iommu->bases),
1268 for (i = 0; i < num_res; i++) {
1269 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
1272 iommu->bases[i] = devm_ioremap_resource(&pdev->dev, res);
1273 if (IS_ERR(iommu->bases[i]))
1277 if (iommu->num_mmu == 0)
1278 return PTR_ERR(iommu->bases[0]);
1280 iommu->num_irq = platform_irq_count(pdev);
1281 if (iommu->num_irq < 0)
1282 return iommu->num_irq;
1284 iommu->reset_disabled = device_property_read_bool(dev,
1285 "rockchip,disable-mmu-reset");
1287 iommu->num_clocks = ARRAY_SIZE(rk_iommu_clocks);
1288 iommu->clocks = devm_kcalloc(iommu->dev, iommu->num_clocks,
1289 sizeof(*iommu->clocks), GFP_KERNEL);
1293 for (i = 0; i < iommu->num_clocks; ++i)
1294 iommu->clocks[i].id = rk_iommu_clocks[i];
1297 * iommu clocks should be present for all new devices and devicetrees
1298 * but there are older devicetrees without clocks out in the wild.
1299 * So clocks as optional for the time being.
1301 err = devm_clk_bulk_get(iommu->dev, iommu->num_clocks, iommu->clocks);
1303 iommu->num_clocks = 0;
1307 err = clk_bulk_prepare(iommu->num_clocks, iommu->clocks);
1311 iommu->group = iommu_group_alloc();
1312 if (IS_ERR(iommu->group)) {
1313 err = PTR_ERR(iommu->group);
1314 goto err_unprepare_clocks;
1317 err = iommu_device_sysfs_add(&iommu->iommu, dev, NULL, dev_name(dev));
1321 err = iommu_device_register(&iommu->iommu, &rk_iommu_ops, dev);
1323 goto err_remove_sysfs;
1326 * Use the first registered IOMMU device for domain to use with DMA
1327 * API, since a domain might not physically correspond to a single
1331 dma_dev = &pdev->dev;
1333 pm_runtime_enable(dev);
1335 for (i = 0; i < iommu->num_irq; i++) {
1336 int irq = platform_get_irq(pdev, i);
1340 goto err_pm_disable;
1343 err = devm_request_irq(iommu->dev, irq, rk_iommu_irq,
1344 IRQF_SHARED, dev_name(dev), iommu);
1346 goto err_pm_disable;
1349 dma_set_mask_and_coherent(dev, rk_ops->dma_bit_mask);
1353 pm_runtime_disable(dev);
1355 iommu_device_sysfs_remove(&iommu->iommu);
1357 iommu_group_put(iommu->group);
1358 err_unprepare_clocks:
1359 clk_bulk_unprepare(iommu->num_clocks, iommu->clocks);
1363 static void rk_iommu_shutdown(struct platform_device *pdev)
1365 struct rk_iommu *iommu = platform_get_drvdata(pdev);
1368 for (i = 0; i < iommu->num_irq; i++) {
1369 int irq = platform_get_irq(pdev, i);
1371 devm_free_irq(iommu->dev, irq, iommu);
1374 pm_runtime_force_suspend(&pdev->dev);
1377 static int __maybe_unused rk_iommu_suspend(struct device *dev)
1379 struct rk_iommu *iommu = dev_get_drvdata(dev);
1381 if (iommu->domain == &rk_identity_domain)
1384 rk_iommu_disable(iommu);
1388 static int __maybe_unused rk_iommu_resume(struct device *dev)
1390 struct rk_iommu *iommu = dev_get_drvdata(dev);
1392 if (iommu->domain == &rk_identity_domain)
1395 return rk_iommu_enable(iommu);
1398 static const struct dev_pm_ops rk_iommu_pm_ops = {
1399 SET_RUNTIME_PM_OPS(rk_iommu_suspend, rk_iommu_resume, NULL)
1400 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1401 pm_runtime_force_resume)
1404 static struct rk_iommu_ops iommu_data_ops_v1 = {
1405 .pt_address = &rk_dte_pt_address,
1406 .mk_dtentries = &rk_mk_dte,
1407 .mk_ptentries = &rk_mk_pte,
1408 .dte_addr_phys = &rk_dte_addr_phys,
1409 .dma_addr_dte = &rk_dma_addr_dte,
1410 .dma_bit_mask = DMA_BIT_MASK(32),
1413 static struct rk_iommu_ops iommu_data_ops_v2 = {
1414 .pt_address = &rk_dte_pt_address_v2,
1415 .mk_dtentries = &rk_mk_dte_v2,
1416 .mk_ptentries = &rk_mk_pte_v2,
1417 .dte_addr_phys = &rk_dte_addr_phys_v2,
1418 .dma_addr_dte = &rk_dma_addr_dte_v2,
1419 .dma_bit_mask = DMA_BIT_MASK(40),
1422 static const struct of_device_id rk_iommu_dt_ids[] = {
1423 { .compatible = "rockchip,iommu",
1424 .data = &iommu_data_ops_v1,
1426 { .compatible = "rockchip,rk3568-iommu",
1427 .data = &iommu_data_ops_v2,
1432 static struct platform_driver rk_iommu_driver = {
1433 .probe = rk_iommu_probe,
1434 .shutdown = rk_iommu_shutdown,
1437 .of_match_table = rk_iommu_dt_ids,
1438 .pm = &rk_iommu_pm_ops,
1439 .suppress_bind_attrs = true,
1442 builtin_platform_driver(rk_iommu_driver);