2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2 as
4 * published by the Free Software Foundation.
7 #ifdef CONFIG_ROCKCHIP_IOMMU_DEBUG
12 #include <linux/interrupt.h>
13 #include <linux/slab.h>
14 #include <linux/clk.h>
15 #include <linux/err.h>
17 #include <linux/errno.h>
18 #include <linux/memblock.h>
19 #include <linux/export.h>
21 #include <asm/cacheflush.h>
22 #include <asm/pgtable.h>
24 #include <linux/rockchip/sysmmu.h>
26 #include "rockchip-iommu.h"
28 /* We does not consider super section mapping (16MB) */
29 #define SPAGE_ORDER 12
30 #define SPAGE_SIZE (1 << SPAGE_ORDER)
31 #define SPAGE_MASK (~(SPAGE_SIZE - 1))
32 typedef enum sysmmu_entry_flags
34 SYSMMU_FLAGS_PRESENT = 0x01,
35 SYSMMU_FLAGS_READ_PERMISSION = 0x02,
36 SYSMMU_FLAGS_WRITE_PERMISSION = 0x04,
37 SYSMMU_FLAGS_OVERRIDE_CACHE = 0x8,
38 SYSMMU_FLAGS_WRITE_CACHEABLE = 0x10,
39 SYSMMU_FLAGS_WRITE_ALLOCATE = 0x20,
40 SYSMMU_FLAGS_WRITE_BUFFERABLE = 0x40,
41 SYSMMU_FLAGS_READ_CACHEABLE = 0x80,
42 SYSMMU_FLAGS_READ_ALLOCATE = 0x100,
43 SYSMMU_FLAGS_MASK = 0x1FF,
46 #define lv1ent_fault(sent) ((*(sent) & SYSMMU_FLAGS_PRESENT) == 0)
47 #define lv1ent_page(sent) ((*(sent) & SYSMMU_FLAGS_PRESENT) == 1)
48 #define lv2ent_fault(pent) ((*(pent) & SYSMMU_FLAGS_PRESENT) == 0)
49 #define spage_phys(pent) (*(pent) & SPAGE_MASK)
50 #define spage_offs(iova) ((iova) & 0x0FFF)
52 #define lv1ent_offset(iova) (((iova)>>22) & 0x03FF)
53 #define lv2ent_offset(iova) (((iova)>>12) & 0x03FF)
55 #define NUM_LV1ENTRIES 1024
56 #define NUM_LV2ENTRIES 1024
58 #define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(long))
60 #define lv2table_base(sent) (*(sent) & 0xFFFFFFFE)
62 #define mk_lv1ent_page(pa) ((pa) | SYSMMU_FLAGS_PRESENT)
63 /*write and read permission for level2 page default*/
64 #define mk_lv2ent_spage(pa) ((pa) | SYSMMU_FLAGS_PRESENT |SYSMMU_FLAGS_READ_PERMISSION |SYSMMU_FLAGS_WRITE_PERMISSION)
66 #define SYSMMU_REG_POLL_COUNT_FAST 1000
69 * MMU register numbers
70 * Used in the register read/write routines.
71 * See the hardware documentation for more information about each register
73 typedef enum sysmmu_register
75 SYSMMU_REGISTER_DTE_ADDR = 0x0000, /**< Current Page Directory Pointer */
76 SYSMMU_REGISTER_STATUS = 0x0004, /**< Status of the MMU */
77 SYSMMU_REGISTER_COMMAND = 0x0008, /**< Command register, used to control the MMU */
78 SYSMMU_REGISTER_PAGE_FAULT_ADDR = 0x000C, /**< Logical address of the last page fault */
79 SYSMMU_REGISTER_ZAP_ONE_LINE = 0x010, /**< Used to invalidate the mapping of a single page from the MMU */
80 SYSMMU_REGISTER_INT_RAWSTAT = 0x0014, /**< Raw interrupt status, all interrupts visible */
81 SYSMMU_REGISTER_INT_CLEAR = 0x0018, /**< Indicate to the MMU that the interrupt has been received */
82 SYSMMU_REGISTER_INT_MASK = 0x001C, /**< Enable/disable types of interrupts */
83 SYSMMU_REGISTER_INT_STATUS = 0x0020, /**< Interrupt status based on the mask */
84 SYSMMU_REGISTER_AUTO_GATING = 0x0024
87 typedef enum sysmmu_command
89 SYSMMU_COMMAND_ENABLE_PAGING = 0x00, /**< Enable paging (memory translation) */
90 SYSMMU_COMMAND_DISABLE_PAGING = 0x01, /**< Disable paging (memory translation) */
91 SYSMMU_COMMAND_ENABLE_STALL = 0x02, /**< Enable stall on page fault */
92 SYSMMU_COMMAND_DISABLE_STALL = 0x03, /**< Disable stall on page fault */
93 SYSMMU_COMMAND_ZAP_CACHE = 0x04, /**< Zap the entire page table cache */
94 SYSMMU_COMMAND_PAGE_FAULT_DONE = 0x05, /**< Page fault processed */
95 SYSMMU_COMMAND_HARD_RESET = 0x06 /**< Reset the MMU back to power-on settings */
99 * MMU interrupt register bits
100 * Each cause of the interrupt is reported
101 * through the (raw) interrupt status registers.
102 * Multiple interrupts can be pending, so multiple bits
103 * can be set at once.
105 typedef enum sysmmu_interrupt
107 SYSMMU_INTERRUPT_PAGE_FAULT = 0x01, /**< A page fault occured */
108 SYSMMU_INTERRUPT_READ_BUS_ERROR = 0x02 /**< A bus read error occured */
111 typedef enum sysmmu_status_bits
113 SYSMMU_STATUS_BIT_PAGING_ENABLED = 1 << 0,
114 SYSMMU_STATUS_BIT_PAGE_FAULT_ACTIVE = 1 << 1,
115 SYSMMU_STATUS_BIT_STALL_ACTIVE = 1 << 2,
116 SYSMMU_STATUS_BIT_IDLE = 1 << 3,
117 SYSMMU_STATUS_BIT_REPLAY_BUFFER_EMPTY = 1 << 4,
118 SYSMMU_STATUS_BIT_PAGE_FAULT_IS_WRITE = 1 << 5,
119 SYSMMU_STATUS_BIT_STALL_NOT_ACTIVE = 1 << 31,
120 } sys_mmu_status_bits;
123 * Size of an MMU page in bytes
125 #define SYSMMU_PAGE_SIZE 0x1000
128 * Size of the address space referenced by a page table page
130 #define SYSMMU_VIRTUAL_PAGE_SIZE 0x400000 /* 4 MiB */
133 * Page directory index from address
134 * Calculates the page directory index from the given address
136 #define SYSMMU_PDE_ENTRY(address) (((address)>>22) & 0x03FF)
139 * Page table index from address
140 * Calculates the page table index from the given address
142 #define SYSMMU_PTE_ENTRY(address) (((address)>>12) & 0x03FF)
145 * Extract the memory address from an PDE/PTE entry
147 #define SYSMMU_ENTRY_ADDRESS(value) ((value) & 0xFFFFFC00)
149 #define INVALID_PAGE ((u32)(~0))
151 static struct kmem_cache *lv2table_kmem_cache;
152 static unsigned long *section_entry(unsigned long *pgtable, unsigned long iova)
154 return pgtable + lv1ent_offset(iova);
157 static unsigned long *page_entry(unsigned long *sent, unsigned long iova)
159 return (unsigned long *)__va(lv2table_base(sent)) + lv2ent_offset(iova);
162 static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = {
168 struct rk_iommu_domain {
169 struct list_head clients; /* list of sysmmu_drvdata.node */
170 unsigned long *pgtable; /* lv1 page table, 4KB */
171 short *lv2entcnt; /* free lv2 entry counter for each section */
172 spinlock_t lock; /* lock for this structure */
173 spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */
176 static bool set_sysmmu_active(struct sysmmu_drvdata *data)
178 /* return true if the System MMU was not active previously
179 and it needs to be initialized */
180 return ++data->activations == 1;
183 static bool set_sysmmu_inactive(struct sysmmu_drvdata *data)
185 /* return true if the System MMU is needed to be disabled */
186 BUG_ON(data->activations < 1);
187 return --data->activations == 0;
190 static bool is_sysmmu_active(struct sysmmu_drvdata *data)
192 return data->activations > 0;
194 static void sysmmu_disable_stall(void __iomem *sfrbase)
197 u32 mmu_status = __raw_readl(sfrbase+SYSMMU_REGISTER_STATUS);
198 if ( 0 == (mmu_status & SYSMMU_STATUS_BIT_PAGING_ENABLED ))
200 //pr_err("MMU disable skipped since it was not enabled.\n");
203 if (mmu_status & SYSMMU_STATUS_BIT_PAGE_FAULT_ACTIVE)
205 pr_err("Aborting MMU disable stall request since it is in pagefault state.\n");
209 __raw_writel(SYSMMU_COMMAND_DISABLE_STALL, sfrbase + SYSMMU_REGISTER_COMMAND);
211 for (i = 0; i < SYSMMU_REG_POLL_COUNT_FAST; ++i)
213 u32 status = __raw_readl(sfrbase + SYSMMU_REGISTER_STATUS);
214 if ( 0 == (status & SYSMMU_STATUS_BIT_STALL_ACTIVE) )
218 if ( status & SYSMMU_STATUS_BIT_PAGE_FAULT_ACTIVE )
222 if ( 0 == (mmu_status & SYSMMU_STATUS_BIT_PAGING_ENABLED ))
227 if (SYSMMU_REG_POLL_COUNT_FAST == i)
228 pr_err("Disable stall request failed, MMU status is 0x%08X\n", __raw_readl(sfrbase + SYSMMU_REGISTER_STATUS));
230 static bool sysmmu_enable_stall(void __iomem *sfrbase)
233 u32 mmu_status = __raw_readl(sfrbase + SYSMMU_REGISTER_STATUS);
235 if ( 0 == (mmu_status & SYSMMU_STATUS_BIT_PAGING_ENABLED) )
237 //pr_info("MMU stall is implicit when Paging is not enabled.\n");
240 if ( mmu_status & SYSMMU_STATUS_BIT_PAGE_FAULT_ACTIVE )
242 pr_err("Aborting MMU stall request since it is in pagefault state.\n");
246 __raw_writel(SYSMMU_COMMAND_ENABLE_STALL, sfrbase + SYSMMU_REGISTER_COMMAND);
248 for (i = 0; i < SYSMMU_REG_POLL_COUNT_FAST; ++i)
250 mmu_status = __raw_readl(sfrbase + SYSMMU_REGISTER_STATUS);
251 if (mmu_status & SYSMMU_STATUS_BIT_PAGE_FAULT_ACTIVE)
255 if ((mmu_status & SYSMMU_STATUS_BIT_STALL_ACTIVE)&&(0==(mmu_status & SYSMMU_STATUS_BIT_STALL_NOT_ACTIVE)))
259 if (0 == (mmu_status & ( SYSMMU_STATUS_BIT_PAGING_ENABLED )))
264 if (SYSMMU_REG_POLL_COUNT_FAST == i)
266 pr_info("Enable stall request failed, MMU status is 0x%08X\n", __raw_readl(sfrbase + SYSMMU_REGISTER_STATUS));
269 if ( mmu_status & SYSMMU_STATUS_BIT_PAGE_FAULT_ACTIVE )
271 pr_info("Aborting MMU stall request since it has a pagefault.\n");
277 static bool sysmmu_enable_paging(void __iomem *sfrbase)
280 __raw_writel(SYSMMU_COMMAND_ENABLE_PAGING, sfrbase + SYSMMU_REGISTER_COMMAND);
282 for (i = 0; i < SYSMMU_REG_POLL_COUNT_FAST; ++i)
284 if (__raw_readl(sfrbase + SYSMMU_REGISTER_STATUS) & SYSMMU_STATUS_BIT_PAGING_ENABLED)
286 //pr_info("Enable paging request success.\n");
290 if (SYSMMU_REG_POLL_COUNT_FAST == i)
292 pr_err("Enable paging request failed, MMU status is 0x%08X\n", __raw_readl(sfrbase + SYSMMU_REGISTER_STATUS));
297 static bool sysmmu_disable_paging(void __iomem *sfrbase)
300 __raw_writel(SYSMMU_COMMAND_DISABLE_PAGING, sfrbase + SYSMMU_REGISTER_COMMAND);
302 for (i = 0; i < SYSMMU_REG_POLL_COUNT_FAST; ++i)
304 if (!(__raw_readl(sfrbase + SYSMMU_REGISTER_STATUS) & SYSMMU_STATUS_BIT_PAGING_ENABLED))
306 //pr_info("Disable paging request success.\n");
310 if (SYSMMU_REG_POLL_COUNT_FAST == i)
312 pr_err("Disable paging request failed, MMU status is 0x%08X\n", __raw_readl(sfrbase + SYSMMU_REGISTER_STATUS));
318 void sysmmu_page_fault_done(void __iomem *sfrbase,const char *dbgname)
320 pr_info("MMU: %s: Leaving page fault mode\n", dbgname);
321 __raw_writel(SYSMMU_COMMAND_PAGE_FAULT_DONE, sfrbase + SYSMMU_REGISTER_COMMAND);
323 bool sysmmu_zap_tlb(void __iomem *sfrbase)
325 bool stall_success = sysmmu_enable_stall(sfrbase);
327 __raw_writel(SYSMMU_COMMAND_ZAP_CACHE, sfrbase + SYSMMU_REGISTER_COMMAND);
328 if (false == stall_success)
330 /* False means that it is in Pagefault state. Not possible to disable_stall then */
333 sysmmu_disable_stall(sfrbase);
336 static inline bool sysmmu_raw_reset(void __iomem *sfrbase)
339 __raw_writel(0xCAFEBABE, sfrbase + SYSMMU_REGISTER_DTE_ADDR);
341 if(!(0xCAFEB000 == __raw_readl(sfrbase+SYSMMU_REGISTER_DTE_ADDR)))
343 pr_err("error when %s.\n",__func__);
346 __raw_writel(SYSMMU_COMMAND_HARD_RESET, sfrbase + SYSMMU_REGISTER_COMMAND);
348 for (i = 0; i < SYSMMU_REG_POLL_COUNT_FAST; ++i)
350 if(__raw_readl(sfrbase + SYSMMU_REGISTER_DTE_ADDR) == 0)
355 if (SYSMMU_REG_POLL_COUNT_FAST == i) {
356 pr_err("%s,Reset request failed, MMU status is 0x%08X\n", __func__,__raw_readl(sfrbase + SYSMMU_REGISTER_DTE_ADDR));
362 static void __sysmmu_set_ptbase(void __iomem *sfrbase,unsigned long pgd)
364 __raw_writel(pgd, sfrbase + SYSMMU_REGISTER_DTE_ADDR);
368 static bool sysmmu_reset(void __iomem *sfrbase,const char *dbgname)
372 err = sysmmu_enable_stall(sfrbase);
375 pr_info("%s:stall failed: %s\n",__func__,dbgname);
378 err = sysmmu_raw_reset(sfrbase);
381 __raw_writel(SYSMMU_INTERRUPT_PAGE_FAULT|SYSMMU_INTERRUPT_READ_BUS_ERROR, sfrbase+SYSMMU_REGISTER_INT_MASK);
383 sysmmu_disable_stall(sfrbase);
385 pr_info("%s: failed: %s\n", __func__,dbgname);
389 static inline void pgtable_flush(void *vastart, void *vaend)
391 dmac_flush_range(vastart, vaend);
392 outer_flush_range(virt_to_phys(vastart),virt_to_phys(vaend));
394 static void __set_fault_handler(struct sysmmu_drvdata *data,
395 sysmmu_fault_handler_t handler)
399 write_lock_irqsave(&data->lock, flags);
400 data->fault_handler = handler;
401 write_unlock_irqrestore(&data->lock, flags);
404 void rockchip_sysmmu_set_fault_handler(struct device *dev,sysmmu_fault_handler_t handler)
406 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
408 __set_fault_handler(data, handler);
411 static int default_fault_handler(struct device *dev,
412 enum rk_sysmmu_inttype itype,
413 unsigned long pgtable_base,
414 unsigned long fault_addr,
418 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
422 pr_info("%s,iommu device not assigned yet\n",__func__);
425 if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT))
426 itype = SYSMMU_FAULT_UNKNOWN;
428 if(itype == SYSMMU_BUSERROR)
429 pr_err("%s occured at 0x%lx(Page table base: 0x%lx)\n",sysmmu_fault_name[itype], fault_addr, pgtable_base);
431 if(itype == SYSMMU_PAGEFAULT)
432 pr_err("SYSMMU:Page fault detected at 0x%lx from bus id %d of type %s on %s\n",
434 (status >> 6) & 0x1F,
435 (status & 32) ? "write" : "read",
439 pr_err("Generating Kernel OOPS... because it is unrecoverable.\n");
445 static void dump_pagetbl(u32 fault_address,unsigned long addr_dte)
452 offset1 = lv1ent_offset(fault_address);
453 offset2 = lv2ent_offset(fault_address);
454 level1_entry = (u32 *)__va(addr_dte)+offset1;
455 level2_base = (u32 *)__va((*level1_entry)&0xfffffffe);
456 level2_entry = level2_base+offset2;
457 pr_info("level1 offset=%d,level2 offset=%d,level1_entry=0x%08x\n",offset1,offset2,(u32)level1_entry);
458 pr_info("*level1_entry = 0x%08x\n",*level1_entry);
459 pr_info("*level2_entry = 0x%08x\n",*level2_entry);
462 static irqreturn_t rockchip_sysmmu_irq(int irq, void *dev_id)
464 /* SYSMMU is in blocked when interrupt occurred. */
465 struct sysmmu_drvdata *data = dev_id;
466 struct resource *irqres;
467 struct platform_device *pdev;
468 enum rk_sysmmu_inttype itype = SYSMMU_FAULT_UNKNOWN;
475 read_lock(&data->lock);
478 WARN_ON(!is_sysmmu_active(data));
480 if(!is_sysmmu_active(data))
482 read_unlock(&data->lock);
486 pdev = to_platform_device(data->sysmmu);
488 for (i = 0; i < data->num_res_irq; i++)
490 irqres = platform_get_resource(pdev, IORESOURCE_IRQ, i);
491 if (irqres && ((int)irqres->start == irq))
495 if (i == data->num_res_irq)
497 itype = SYSMMU_FAULT_UNKNOWN;
501 int_status = __raw_readl(data->res_bases[i] + SYSMMU_REGISTER_INT_STATUS);
505 __raw_writel(0x00,data->res_bases[i] + SYSMMU_REGISTER_INT_MASK);
507 rawstat = __raw_readl(data->res_bases[i] + SYSMMU_REGISTER_INT_RAWSTAT);
509 if(rawstat & SYSMMU_INTERRUPT_PAGE_FAULT)
511 fault_address = __raw_readl(data->res_bases[i] + SYSMMU_REGISTER_PAGE_FAULT_ADDR);
512 itype = SYSMMU_PAGEFAULT;
514 else if(rawstat & SYSMMU_INTERRUPT_READ_BUS_ERROR)
516 itype = SYSMMU_BUSERROR;
522 dump_pagetbl(fault_address,__raw_readl(data->res_bases[i] + SYSMMU_REGISTER_DTE_ADDR));
528 if (data->fault_handler)
530 unsigned long base = __raw_readl(data->res_bases[i] + SYSMMU_REGISTER_DTE_ADDR);
531 status = __raw_readl(data->res_bases[i] + SYSMMU_REGISTER_STATUS);
532 ret = data->fault_handler(data->dev, itype, base, fault_address,status);
535 if (!ret && (itype != SYSMMU_FAULT_UNKNOWN))
537 if(SYSMMU_PAGEFAULT == itype)
539 sysmmu_zap_tlb(data->res_bases[i]);
540 sysmmu_page_fault_done(data->res_bases[i],data->dbgname);
541 __raw_writel(SYSMMU_INTERRUPT_PAGE_FAULT|SYSMMU_INTERRUPT_READ_BUS_ERROR, data->res_bases[i]+SYSMMU_REGISTER_INT_MASK);
545 pr_err("(%s) %s is not handled.\n",data->dbgname, sysmmu_fault_name[itype]);
548 read_unlock(&data->lock);
553 static bool __rockchip_sysmmu_disable(struct sysmmu_drvdata *data)
556 bool disabled = false;
558 write_lock_irqsave(&data->lock, flags);
560 if (!set_sysmmu_inactive(data))
563 for(i=0;i<data->num_res_mem;i++)
565 sysmmu_disable_paging(data->res_bases[i]);
572 write_unlock_irqrestore(&data->lock, flags);
575 pr_info("(%s) Disabled\n", data->dbgname);
577 pr_info("(%s) %d times left to be disabled\n",data->dbgname, data->activations);
582 /* __rk_sysmmu_enable: Enables System MMU
584 * returns -error if an error occurred and System MMU is not enabled,
585 * 0 if the System MMU has been just enabled and 1 if System MMU was already
588 static int __rockchip_sysmmu_enable(struct sysmmu_drvdata *data,unsigned long pgtable, struct iommu_domain *domain)
593 write_lock_irqsave(&data->lock, flags);
595 if (!set_sysmmu_active(data))
597 if (WARN_ON(pgtable != data->pgtable))
600 set_sysmmu_inactive(data);
605 pr_info("(%s) Already enabled\n", data->dbgname);
609 data->pgtable = pgtable;
611 for (i = 0; i < data->num_res_mem; i++)
614 status = sysmmu_enable_stall(data->res_bases[i]);
617 __sysmmu_set_ptbase(data->res_bases[i], pgtable);
618 __raw_writel(SYSMMU_COMMAND_ZAP_CACHE, data->res_bases[i] + SYSMMU_REGISTER_COMMAND);
620 sysmmu_enable_paging(data->res_bases[i]);
621 sysmmu_disable_stall(data->res_bases[i]);
624 data->domain = domain;
626 pr_info("(%s) Enabled\n", data->dbgname);
628 write_unlock_irqrestore(&data->lock, flags);
632 bool rockchip_sysmmu_disable(struct device *dev)
634 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
637 disabled = __rockchip_sysmmu_disable(data);
641 void rockchip_sysmmu_tlb_invalidate(struct device *dev)
644 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
646 read_lock_irqsave(&data->lock, flags);
648 if (is_sysmmu_active(data))
651 for (i = 0; i < data->num_res_mem; i++)
653 if(!sysmmu_zap_tlb(data->res_bases[i]))
654 pr_err("%s,invalidating TLB failed\n",data->dbgname);
658 pr_info("(%s) Disabled. Skipping invalidating TLB.\n",data->dbgname);
660 read_unlock_irqrestore(&data->lock, flags);
662 static phys_addr_t rockchip_iommu_iova_to_phys(struct iommu_domain *domain,dma_addr_t iova)
664 struct rk_iommu_domain *priv = domain->priv;
665 unsigned long *entry;
667 phys_addr_t phys = 0;
669 spin_lock_irqsave(&priv->pgtablelock, flags);
671 entry = section_entry(priv->pgtable, iova);
672 entry = page_entry(entry, iova);
673 phys = spage_phys(entry) + spage_offs(iova);
675 spin_unlock_irqrestore(&priv->pgtablelock, flags);
679 static int lv2set_page(unsigned long *pent, phys_addr_t paddr, size_t size,
682 if (!lv2ent_fault(pent))
685 *pent = mk_lv2ent_spage(paddr);
686 pgtable_flush(pent, pent + 1);
691 static unsigned long *alloc_lv2entry(unsigned long *sent, unsigned long iova,short *pgcounter)
693 if (lv1ent_fault(sent))
697 pent = kmem_cache_zalloc(lv2table_kmem_cache, GFP_ATOMIC);
698 BUG_ON((unsigned long)pent & (LV2TABLE_SIZE - 1));
702 *sent = mk_lv1ent_page(__pa(pent));
703 kmemleak_ignore(pent);
704 *pgcounter = NUM_LV2ENTRIES;
705 pgtable_flush(pent, pent + NUM_LV2ENTRIES);
706 pgtable_flush(sent, sent + 1);
708 return page_entry(sent, iova);
711 static size_t rockchip_iommu_unmap(struct iommu_domain *domain,unsigned long iova, size_t size)
713 struct rk_iommu_domain *priv = domain->priv;
717 BUG_ON(priv->pgtable == NULL);
719 spin_lock_irqsave(&priv->pgtablelock, flags);
721 ent = section_entry(priv->pgtable, iova);
723 if (unlikely(lv1ent_fault(ent)))
725 if (size > SPAGE_SIZE)
730 /* lv1ent_page(sent) == true here */
732 ent = page_entry(ent, iova);
734 if (unlikely(lv2ent_fault(ent)))
742 priv->lv2entcnt[lv1ent_offset(iova)] += 1;
746 //pr_info("%s:unmap iova 0x%lx/0x%x bytes\n",__func__, iova,size);
747 spin_unlock_irqrestore(&priv->pgtablelock, flags);
751 static int rockchip_iommu_map(struct iommu_domain *domain, unsigned long iova,
752 phys_addr_t paddr, size_t size, int prot)
754 struct rk_iommu_domain *priv = domain->priv;
755 unsigned long *entry;
760 BUG_ON(priv->pgtable == NULL);
762 spin_lock_irqsave(&priv->pgtablelock, flags);
764 entry = section_entry(priv->pgtable, iova);
766 pent = alloc_lv2entry(entry, iova,&priv->lv2entcnt[lv1ent_offset(iova)]);
770 ret = lv2set_page(pent, paddr, size,&priv->lv2entcnt[lv1ent_offset(iova)]);
774 pr_err("%s: Failed to map iova 0x%lx/0x%x bytes\n",__func__, iova, size);
776 spin_unlock_irqrestore(&priv->pgtablelock, flags);
781 static void rockchip_iommu_detach_device(struct iommu_domain *domain,
784 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
785 struct rk_iommu_domain *priv = domain->priv;
786 struct list_head *pos;
790 spin_lock_irqsave(&priv->lock, flags);
792 list_for_each(pos, &priv->clients)
794 if (list_entry(pos, struct sysmmu_drvdata, node) == data)
803 if (__rockchip_sysmmu_disable(data))
805 pr_info("%s: Detached IOMMU with pgtable %#lx\n",__func__, __pa(priv->pgtable));
806 list_del(&data->node);
807 INIT_LIST_HEAD(&data->node);
811 pr_info("%s: Detaching IOMMU with pgtable %#lx delayed",__func__, __pa(priv->pgtable));
814 spin_unlock_irqrestore(&priv->lock, flags);
816 static int rockchip_iommu_attach_device(struct iommu_domain *domain,struct device *dev)
818 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
819 struct rk_iommu_domain *priv = domain->priv;
823 spin_lock_irqsave(&priv->lock, flags);
825 ret = __rockchip_sysmmu_enable(data, __pa(priv->pgtable), domain);
829 /* 'data->node' must not be appeared in priv->clients */
830 BUG_ON(!list_empty(&data->node));
832 list_add_tail(&data->node, &priv->clients);
835 spin_unlock_irqrestore(&priv->lock, flags);
839 pr_err("%s: Failed to attach IOMMU with pgtable %#lx\n",__func__, __pa(priv->pgtable));
843 pr_info("%s: IOMMU with pgtable 0x%lx already attached\n",__func__, __pa(priv->pgtable));
847 pr_info("%s: Attached new IOMMU with pgtable 0x%lx\n",__func__, __pa(priv->pgtable));
852 static void rockchip_iommu_domain_destroy(struct iommu_domain *domain)
854 struct rk_iommu_domain *priv = domain->priv;
855 struct sysmmu_drvdata *data;
859 WARN_ON(!list_empty(&priv->clients));
861 spin_lock_irqsave(&priv->lock, flags);
863 list_for_each_entry(data, &priv->clients, node)
865 while (!rockchip_sysmmu_disable(data->dev))
866 ; /* until System MMU is actually disabled */
868 spin_unlock_irqrestore(&priv->lock, flags);
870 for (i = 0; i < NUM_LV1ENTRIES; i++)
871 if (lv1ent_page(priv->pgtable + i))
872 kmem_cache_free(lv2table_kmem_cache,__va(lv2table_base(priv->pgtable + i)));
874 free_pages((unsigned long)priv->pgtable, 0);
875 free_pages((unsigned long)priv->lv2entcnt, 0);
880 static int rockchip_iommu_domain_init(struct iommu_domain *domain)
882 struct rk_iommu_domain *priv;
884 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
888 /*rk32xx sysmmu use 2 level pagetable,
889 level1 and leve2 both have 1024 entries,each entry occupy 4 bytes,
890 so alloc a page size for each page table
892 priv->pgtable = (unsigned long *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
896 priv->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
897 if (!priv->lv2entcnt)
900 pgtable_flush(priv->pgtable, priv->pgtable + NUM_LV1ENTRIES);
902 spin_lock_init(&priv->lock);
903 spin_lock_init(&priv->pgtablelock);
904 INIT_LIST_HEAD(&priv->clients);
910 free_pages((unsigned long)priv->pgtable, 0);
916 static struct iommu_ops rk_iommu_ops =
918 .domain_init = &rockchip_iommu_domain_init,
919 .domain_destroy = &rockchip_iommu_domain_destroy,
920 .attach_dev = &rockchip_iommu_attach_device,
921 .detach_dev = &rockchip_iommu_detach_device,
922 .map = &rockchip_iommu_map,
923 .unmap = &rockchip_iommu_unmap,
924 .iova_to_phys = &rockchip_iommu_iova_to_phys,
925 .pgsize_bitmap = SPAGE_SIZE,
928 static int rockchip_sysmmu_prepare(void)
931 static int registed = 0;
936 lv2table_kmem_cache = kmem_cache_create("rk-iommu-lv2table",LV2TABLE_SIZE, LV2TABLE_SIZE, 0, NULL);
937 if (!lv2table_kmem_cache)
939 pr_err("%s: failed to create kmem cache\n", __func__);
942 ret = bus_set_iommu(&platform_bus_type, &rk_iommu_ops);
946 pr_err("%s:failed to set iommu to bus\r\n",__func__);
949 static int rockchip_get_sysmmu_resource_num(struct platform_device *pdev,unsigned int type)
951 struct resource *info = NULL;
952 int num_resources = 0;
956 info = platform_get_resource(pdev, type, num_resources);
962 return num_resources;
965 static int rockchip_sysmmu_probe(struct platform_device *pdev)
969 struct sysmmu_drvdata *data;
973 ret = rockchip_sysmmu_prepare();
976 pr_err("%s,failed\r\n",__func__);
980 data = devm_kzalloc(dev,sizeof(*data), GFP_KERNEL);
983 dev_dbg(dev, "Not enough memory\n");
988 ret = dev_set_drvdata(dev, data);
991 dev_dbg(dev, "Unabled to initialize driver data\n");
995 if(pdev->dev.of_node)
997 of_property_read_string(pdev->dev.of_node,"dbgname",&(data->dbgname));
1001 pr_info("dbgname not assigned in device tree or device node not exist\r\n");
1004 pr_info("(%s) Enter\n", data->dbgname);
1006 /*rk32xx sysmmu need both irq and memory */
1007 data->num_res_mem = rockchip_get_sysmmu_resource_num(pdev,IORESOURCE_MEM);
1008 if(0 == data->num_res_mem)
1010 pr_err("can't find sysmmu memory resource \r\n");
1013 pr_info("data->num_res_mem=%d\n",data->num_res_mem);
1014 data->num_res_irq = rockchip_get_sysmmu_resource_num(pdev,IORESOURCE_IRQ);
1015 if(0 == data->num_res_irq)
1017 pr_err("can't find sysmmu irq resource \r\n");
1021 data->res_bases = kmalloc(sizeof(*data->res_bases) * data->num_res_mem,GFP_KERNEL);
1022 if (data->res_bases == NULL)
1024 dev_dbg(dev, "Not enough memory\n");
1029 for (i = 0; i < data->num_res_mem; i++)
1031 struct resource *res;
1032 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
1035 pr_err("Unable to find IOMEM region\n");
1039 data->res_bases[i] = ioremap(res->start, resource_size(res));
1040 pr_info("res->start = 0x%08x ioremap to data->res_bases[%d] = 0x%08x\n",res->start,i,(unsigned int)data->res_bases[i]);
1041 if (!data->res_bases[i])
1043 pr_err("Unable to map IOMEM @ PA:%#x\n",res->start);
1047 if(!strstr(data->dbgname,"isp"))
1050 if(!sysmmu_reset(data->res_bases[i],data->dbgname))
1058 for (i = 0; i < data->num_res_irq; i++)
1060 ret = platform_get_irq(pdev, i);
1063 pr_err("Unable to find IRQ resource\n");
1066 ret = request_irq(ret, rockchip_sysmmu_irq, IRQF_SHARED ,dev_name(dev), data);
1069 pr_err("Unabled to register interrupt handler\n");
1073 ret = rockchip_init_iovmm(dev, &data->vmm);
1079 rwlock_init(&data->lock);
1080 INIT_LIST_HEAD(&data->node);
1082 __set_fault_handler(data, &default_fault_handler);
1084 pr_info("(%s) Initialized\n", data->dbgname);
1092 irq = platform_get_irq(pdev, i);
1093 free_irq(irq, data);
1096 while (data->num_res_mem-- > 0)
1097 iounmap(data->res_bases[data->num_res_mem]);
1098 kfree(data->res_bases);
1102 dev_err(dev, "Failed to initialize\n");
1107 static const struct of_device_id sysmmu_dt_ids[] =
1109 { .compatible = IEP_SYSMMU_COMPATIBLE_NAME},
1110 { .compatible = VIP_SYSMMU_COMPATIBLE_NAME},
1111 { .compatible = VOPB_SYSMMU_COMPATIBLE_NAME},
1112 { .compatible = VOPL_SYSMMU_COMPATIBLE_NAME},
1113 { .compatible = HEVC_SYSMMU_COMPATIBLE_NAME},
1114 { .compatible = VPU_SYSMMU_COMPATIBLE_NAME},
1115 { .compatible = ISP_SYSMMU_COMPATIBLE_NAME},
1118 MODULE_DEVICE_TABLE(of, sysmmu_dt_ids);
1121 static struct platform_driver rk_sysmmu_driver =
1123 .probe = rockchip_sysmmu_probe,
1127 .name = "rk_sysmmu",
1128 .owner = THIS_MODULE,
1129 .of_match_table = of_match_ptr(sysmmu_dt_ids),
1134 /*I don't know why this can't work*/
1136 module_platform_driver(rk_sysmmu_driver);
1139 static int __init rockchip_sysmmu_init_driver(void)
1141 return platform_driver_register(&rk_sysmmu_driver);
1144 core_initcall(rockchip_sysmmu_init_driver);