1 // SPDX-License-Identifier: GPL-2.0-only
3 * omap iommu: tlb and pagetable primitives
5 * Copyright (C) 2008-2010 Nokia Corporation
6 * Copyright (C) 2013-2017 Texas Instruments Incorporated - http://www.ti.com/
8 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
9 * Paul Mundt and Toshihiro Kobayashi
12 #include <linux/dma-mapping.h>
13 #include <linux/err.h>
14 #include <linux/slab.h>
15 #include <linux/interrupt.h>
16 #include <linux/ioport.h>
17 #include <linux/platform_device.h>
18 #include <linux/iommu.h>
19 #include <linux/omap-iommu.h>
20 #include <linux/mutex.h>
21 #include <linux/spinlock.h>
23 #include <linux/pm_runtime.h>
25 #include <linux/of_iommu.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_platform.h>
28 #include <linux/regmap.h>
29 #include <linux/mfd/syscon.h>
31 #include <linux/platform_data/iommu-omap.h>
33 #include "omap-iopgtable.h"
34 #include "omap-iommu.h"
36 static const struct iommu_ops omap_iommu_ops;
38 #define to_iommu(dev) ((struct omap_iommu *)dev_get_drvdata(dev))
40 /* bitmap of the page sizes currently supported */
41 #define OMAP_IOMMU_PGSIZES (SZ_4K | SZ_64K | SZ_1M | SZ_16M)
43 #define MMU_LOCK_BASE_SHIFT 10
44 #define MMU_LOCK_BASE_MASK (0x1f << MMU_LOCK_BASE_SHIFT)
45 #define MMU_LOCK_BASE(x) \
46 ((x & MMU_LOCK_BASE_MASK) >> MMU_LOCK_BASE_SHIFT)
48 #define MMU_LOCK_VICT_SHIFT 4
49 #define MMU_LOCK_VICT_MASK (0x1f << MMU_LOCK_VICT_SHIFT)
50 #define MMU_LOCK_VICT(x) \
51 ((x & MMU_LOCK_VICT_MASK) >> MMU_LOCK_VICT_SHIFT)
53 static struct platform_driver omap_iommu_driver;
54 static struct kmem_cache *iopte_cachep;
57 * to_omap_domain - Get struct omap_iommu_domain from generic iommu_domain
58 * @dom: generic iommu domain handle
60 static struct omap_iommu_domain *to_omap_domain(struct iommu_domain *dom)
62 return container_of(dom, struct omap_iommu_domain, domain);
66 * omap_iommu_save_ctx - Save registers for pm off-mode support
69 void omap_iommu_save_ctx(struct device *dev)
71 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
72 struct omap_iommu *obj;
79 while (arch_data->iommu_dev) {
80 obj = arch_data->iommu_dev;
82 for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
83 p[i] = iommu_read_reg(obj, i * sizeof(u32));
84 dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i,
90 EXPORT_SYMBOL_GPL(omap_iommu_save_ctx);
93 * omap_iommu_restore_ctx - Restore registers for pm off-mode support
96 void omap_iommu_restore_ctx(struct device *dev)
98 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
99 struct omap_iommu *obj;
106 while (arch_data->iommu_dev) {
107 obj = arch_data->iommu_dev;
109 for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
110 iommu_write_reg(obj, p[i], i * sizeof(u32));
111 dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i,
117 EXPORT_SYMBOL_GPL(omap_iommu_restore_ctx);
119 static void dra7_cfg_dspsys_mmu(struct omap_iommu *obj, bool enable)
126 mask = (1 << (obj->id * DSP_SYS_MMU_CONFIG_EN_SHIFT));
127 val = enable ? mask : 0;
128 regmap_update_bits(obj->syscfg, DSP_SYS_MMU_CONFIG, mask, val);
131 static void __iommu_set_twl(struct omap_iommu *obj, bool on)
133 u32 l = iommu_read_reg(obj, MMU_CNTL);
136 iommu_write_reg(obj, MMU_IRQ_TWL_MASK, MMU_IRQENABLE);
138 iommu_write_reg(obj, MMU_IRQ_TLB_MISS_MASK, MMU_IRQENABLE);
142 l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN);
144 l |= (MMU_CNTL_MMU_EN);
146 iommu_write_reg(obj, l, MMU_CNTL);
149 static int omap2_iommu_enable(struct omap_iommu *obj)
153 if (!obj->iopgd || !IS_ALIGNED((u32)obj->iopgd, SZ_16K))
156 pa = virt_to_phys(obj->iopgd);
157 if (!IS_ALIGNED(pa, SZ_16K))
160 l = iommu_read_reg(obj, MMU_REVISION);
161 dev_info(obj->dev, "%s: version %d.%d\n", obj->name,
162 (l >> 4) & 0xf, l & 0xf);
164 iommu_write_reg(obj, pa, MMU_TTB);
166 dra7_cfg_dspsys_mmu(obj, true);
168 if (obj->has_bus_err_back)
169 iommu_write_reg(obj, MMU_GP_REG_BUS_ERR_BACK_EN, MMU_GP_REG);
171 __iommu_set_twl(obj, true);
176 static void omap2_iommu_disable(struct omap_iommu *obj)
178 u32 l = iommu_read_reg(obj, MMU_CNTL);
181 iommu_write_reg(obj, l, MMU_CNTL);
182 dra7_cfg_dspsys_mmu(obj, false);
184 dev_dbg(obj->dev, "%s is shutting down\n", obj->name);
187 static int iommu_enable(struct omap_iommu *obj)
190 struct platform_device *pdev = to_platform_device(obj->dev);
191 struct iommu_platform_data *pdata = dev_get_platdata(&pdev->dev);
193 if (pdata && pdata->set_pwrdm_constraint) {
194 err = pdata->set_pwrdm_constraint(pdev, true, &obj->pwrst);
196 dev_warn(obj->dev, "pwrdm_constraint failed to be set, status = %d\n",
201 if (pdata && pdata->deassert_reset) {
202 err = pdata->deassert_reset(pdev, pdata->reset_name);
204 dev_err(obj->dev, "deassert_reset failed: %d\n", err);
209 pm_runtime_get_sync(obj->dev);
211 err = omap2_iommu_enable(obj);
216 static void iommu_disable(struct omap_iommu *obj)
218 struct platform_device *pdev = to_platform_device(obj->dev);
219 struct iommu_platform_data *pdata = dev_get_platdata(&pdev->dev);
222 omap2_iommu_disable(obj);
224 pm_runtime_put_sync(obj->dev);
226 if (pdata && pdata->assert_reset)
227 pdata->assert_reset(pdev, pdata->reset_name);
229 if (pdata && pdata->set_pwrdm_constraint) {
230 ret = pdata->set_pwrdm_constraint(pdev, false, &obj->pwrst);
232 dev_warn(obj->dev, "pwrdm_constraint failed to be reset, status = %d\n",
241 static u32 iotlb_cr_to_virt(struct cr_regs *cr)
243 u32 page_size = cr->cam & MMU_CAM_PGSZ_MASK;
244 u32 mask = get_cam_va_mask(cr->cam & page_size);
246 return cr->cam & mask;
249 static u32 get_iopte_attr(struct iotlb_entry *e)
253 attr = e->mixed << 5;
255 attr |= e->elsz >> 3;
256 attr <<= (((e->pgsz == MMU_CAM_PGSZ_4K) ||
257 (e->pgsz == MMU_CAM_PGSZ_64K)) ? 0 : 6);
261 static u32 iommu_report_fault(struct omap_iommu *obj, u32 *da)
263 u32 status, fault_addr;
265 status = iommu_read_reg(obj, MMU_IRQSTATUS);
266 status &= MMU_IRQ_MASK;
272 fault_addr = iommu_read_reg(obj, MMU_FAULT_AD);
275 iommu_write_reg(obj, status, MMU_IRQSTATUS);
280 void iotlb_lock_get(struct omap_iommu *obj, struct iotlb_lock *l)
284 val = iommu_read_reg(obj, MMU_LOCK);
286 l->base = MMU_LOCK_BASE(val);
287 l->vict = MMU_LOCK_VICT(val);
290 void iotlb_lock_set(struct omap_iommu *obj, struct iotlb_lock *l)
294 val = (l->base << MMU_LOCK_BASE_SHIFT);
295 val |= (l->vict << MMU_LOCK_VICT_SHIFT);
297 iommu_write_reg(obj, val, MMU_LOCK);
300 static void iotlb_read_cr(struct omap_iommu *obj, struct cr_regs *cr)
302 cr->cam = iommu_read_reg(obj, MMU_READ_CAM);
303 cr->ram = iommu_read_reg(obj, MMU_READ_RAM);
306 static void iotlb_load_cr(struct omap_iommu *obj, struct cr_regs *cr)
308 iommu_write_reg(obj, cr->cam | MMU_CAM_V, MMU_CAM);
309 iommu_write_reg(obj, cr->ram, MMU_RAM);
311 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
312 iommu_write_reg(obj, 1, MMU_LD_TLB);
315 /* only used in iotlb iteration for-loop */
316 struct cr_regs __iotlb_read_cr(struct omap_iommu *obj, int n)
321 iotlb_lock_get(obj, &l);
323 iotlb_lock_set(obj, &l);
324 iotlb_read_cr(obj, &cr);
329 #ifdef PREFETCH_IOTLB
330 static struct cr_regs *iotlb_alloc_cr(struct omap_iommu *obj,
331 struct iotlb_entry *e)
338 if (e->da & ~(get_cam_va_mask(e->pgsz))) {
339 dev_err(obj->dev, "%s:\twrong alignment: %08x\n", __func__,
341 return ERR_PTR(-EINVAL);
344 cr = kmalloc(sizeof(*cr), GFP_KERNEL);
346 return ERR_PTR(-ENOMEM);
348 cr->cam = (e->da & MMU_CAM_VATAG_MASK) | e->prsvd | e->pgsz | e->valid;
349 cr->ram = e->pa | e->endian | e->elsz | e->mixed;
355 * load_iotlb_entry - Set an iommu tlb entry
357 * @e: an iommu tlb entry info
359 static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
365 if (!obj || !obj->nr_tlb_entries || !e)
368 pm_runtime_get_sync(obj->dev);
370 iotlb_lock_get(obj, &l);
371 if (l.base == obj->nr_tlb_entries) {
372 dev_warn(obj->dev, "%s: preserve entries full\n", __func__);
380 for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, tmp)
381 if (!iotlb_cr_valid(&tmp))
384 if (i == obj->nr_tlb_entries) {
385 dev_dbg(obj->dev, "%s: full: no entry\n", __func__);
390 iotlb_lock_get(obj, &l);
393 iotlb_lock_set(obj, &l);
396 cr = iotlb_alloc_cr(obj, e);
398 pm_runtime_put_sync(obj->dev);
402 iotlb_load_cr(obj, cr);
407 /* increment victim for next tlb load */
408 if (++l.vict == obj->nr_tlb_entries)
410 iotlb_lock_set(obj, &l);
412 pm_runtime_put_sync(obj->dev);
416 #else /* !PREFETCH_IOTLB */
418 static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
423 #endif /* !PREFETCH_IOTLB */
425 static int prefetch_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
427 return load_iotlb_entry(obj, e);
431 * flush_iotlb_page - Clear an iommu tlb entry
433 * @da: iommu device virtual address
435 * Clear an iommu tlb entry which includes 'da' address.
437 static void flush_iotlb_page(struct omap_iommu *obj, u32 da)
442 pm_runtime_get_sync(obj->dev);
444 for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, cr) {
448 if (!iotlb_cr_valid(&cr))
451 start = iotlb_cr_to_virt(&cr);
452 bytes = iopgsz_to_bytes(cr.cam & 3);
454 if ((start <= da) && (da < start + bytes)) {
455 dev_dbg(obj->dev, "%s: %08x<=%08x(%x)\n",
456 __func__, start, da, bytes);
457 iotlb_load_cr(obj, &cr);
458 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
462 pm_runtime_put_sync(obj->dev);
464 if (i == obj->nr_tlb_entries)
465 dev_dbg(obj->dev, "%s: no page for %08x\n", __func__, da);
469 * flush_iotlb_all - Clear all iommu tlb entries
472 static void flush_iotlb_all(struct omap_iommu *obj)
476 pm_runtime_get_sync(obj->dev);
480 iotlb_lock_set(obj, &l);
482 iommu_write_reg(obj, 1, MMU_GFLUSH);
484 pm_runtime_put_sync(obj->dev);
488 * H/W pagetable operations
490 static void flush_iopte_range(struct device *dev, dma_addr_t dma,
491 unsigned long offset, int num_entries)
493 size_t size = num_entries * sizeof(u32);
495 dma_sync_single_range_for_device(dev, dma, offset, size, DMA_TO_DEVICE);
498 static void iopte_free(struct omap_iommu *obj, u32 *iopte, bool dma_valid)
502 /* Note: freed iopte's must be clean ready for re-use */
505 pt_dma = virt_to_phys(iopte);
506 dma_unmap_single(obj->dev, pt_dma, IOPTE_TABLE_SIZE,
510 kmem_cache_free(iopte_cachep, iopte);
514 static u32 *iopte_alloc(struct omap_iommu *obj, u32 *iopgd,
515 dma_addr_t *pt_dma, u32 da)
518 unsigned long offset = iopgd_index(da) * sizeof(da);
520 /* a table has already existed */
525 * do the allocation outside the page table lock
527 spin_unlock(&obj->page_table_lock);
528 iopte = kmem_cache_zalloc(iopte_cachep, GFP_KERNEL);
529 spin_lock(&obj->page_table_lock);
533 return ERR_PTR(-ENOMEM);
535 *pt_dma = dma_map_single(obj->dev, iopte, IOPTE_TABLE_SIZE,
537 if (dma_mapping_error(obj->dev, *pt_dma)) {
538 dev_err(obj->dev, "DMA map error for L2 table\n");
539 iopte_free(obj, iopte, false);
540 return ERR_PTR(-ENOMEM);
544 * we rely on dma address and the physical address to be
545 * the same for mapping the L2 table
547 if (WARN_ON(*pt_dma != virt_to_phys(iopte))) {
548 dev_err(obj->dev, "DMA translation error for L2 table\n");
549 dma_unmap_single(obj->dev, *pt_dma, IOPTE_TABLE_SIZE,
551 iopte_free(obj, iopte, false);
552 return ERR_PTR(-ENOMEM);
555 *iopgd = virt_to_phys(iopte) | IOPGD_TABLE;
557 flush_iopte_range(obj->dev, obj->pd_dma, offset, 1);
558 dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte);
560 /* We raced, free the reduniovant table */
561 iopte_free(obj, iopte, false);
565 iopte = iopte_offset(iopgd, da);
566 *pt_dma = iopgd_page_paddr(iopgd);
568 "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
569 __func__, da, iopgd, *iopgd, iopte, *iopte);
574 static int iopgd_alloc_section(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
576 u32 *iopgd = iopgd_offset(obj, da);
577 unsigned long offset = iopgd_index(da) * sizeof(da);
579 if ((da | pa) & ~IOSECTION_MASK) {
580 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
581 __func__, da, pa, IOSECTION_SIZE);
585 *iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION;
586 flush_iopte_range(obj->dev, obj->pd_dma, offset, 1);
590 static int iopgd_alloc_super(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
592 u32 *iopgd = iopgd_offset(obj, da);
593 unsigned long offset = iopgd_index(da) * sizeof(da);
596 if ((da | pa) & ~IOSUPER_MASK) {
597 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
598 __func__, da, pa, IOSUPER_SIZE);
602 for (i = 0; i < 16; i++)
603 *(iopgd + i) = (pa & IOSUPER_MASK) | prot | IOPGD_SUPER;
604 flush_iopte_range(obj->dev, obj->pd_dma, offset, 16);
608 static int iopte_alloc_page(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
610 u32 *iopgd = iopgd_offset(obj, da);
612 u32 *iopte = iopte_alloc(obj, iopgd, &pt_dma, da);
613 unsigned long offset = iopte_index(da) * sizeof(da);
616 return PTR_ERR(iopte);
618 *iopte = (pa & IOPAGE_MASK) | prot | IOPTE_SMALL;
619 flush_iopte_range(obj->dev, pt_dma, offset, 1);
621 dev_vdbg(obj->dev, "%s: da:%08x pa:%08x pte:%p *pte:%08x\n",
622 __func__, da, pa, iopte, *iopte);
627 static int iopte_alloc_large(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
629 u32 *iopgd = iopgd_offset(obj, da);
631 u32 *iopte = iopte_alloc(obj, iopgd, &pt_dma, da);
632 unsigned long offset = iopte_index(da) * sizeof(da);
635 if ((da | pa) & ~IOLARGE_MASK) {
636 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
637 __func__, da, pa, IOLARGE_SIZE);
642 return PTR_ERR(iopte);
644 for (i = 0; i < 16; i++)
645 *(iopte + i) = (pa & IOLARGE_MASK) | prot | IOPTE_LARGE;
646 flush_iopte_range(obj->dev, pt_dma, offset, 16);
651 iopgtable_store_entry_core(struct omap_iommu *obj, struct iotlb_entry *e)
653 int (*fn)(struct omap_iommu *, u32, u32, u32);
661 case MMU_CAM_PGSZ_16M:
662 fn = iopgd_alloc_super;
664 case MMU_CAM_PGSZ_1M:
665 fn = iopgd_alloc_section;
667 case MMU_CAM_PGSZ_64K:
668 fn = iopte_alloc_large;
670 case MMU_CAM_PGSZ_4K:
671 fn = iopte_alloc_page;
681 prot = get_iopte_attr(e);
683 spin_lock(&obj->page_table_lock);
684 err = fn(obj, e->da, e->pa, prot);
685 spin_unlock(&obj->page_table_lock);
691 * omap_iopgtable_store_entry - Make an iommu pte entry
693 * @e: an iommu tlb entry info
696 omap_iopgtable_store_entry(struct omap_iommu *obj, struct iotlb_entry *e)
700 flush_iotlb_page(obj, e->da);
701 err = iopgtable_store_entry_core(obj, e);
703 prefetch_iotlb_entry(obj, e);
708 * iopgtable_lookup_entry - Lookup an iommu pte entry
710 * @da: iommu device virtual address
711 * @ppgd: iommu pgd entry pointer to be returned
712 * @ppte: iommu pte entry pointer to be returned
715 iopgtable_lookup_entry(struct omap_iommu *obj, u32 da, u32 **ppgd, u32 **ppte)
717 u32 *iopgd, *iopte = NULL;
719 iopgd = iopgd_offset(obj, da);
723 if (iopgd_is_table(*iopgd))
724 iopte = iopte_offset(iopgd, da);
730 static size_t iopgtable_clear_entry_core(struct omap_iommu *obj, u32 da)
733 u32 *iopgd = iopgd_offset(obj, da);
736 unsigned long pd_offset = iopgd_index(da) * sizeof(da);
737 unsigned long pt_offset = iopte_index(da) * sizeof(da);
742 if (iopgd_is_table(*iopgd)) {
744 u32 *iopte = iopte_offset(iopgd, da);
747 if (*iopte & IOPTE_LARGE) {
749 /* rewind to the 1st entry */
750 iopte = iopte_offset(iopgd, (da & IOLARGE_MASK));
753 memset(iopte, 0, nent * sizeof(*iopte));
754 pt_dma = iopgd_page_paddr(iopgd);
755 flush_iopte_range(obj->dev, pt_dma, pt_offset, nent);
758 * do table walk to check if this table is necessary or not
760 iopte = iopte_offset(iopgd, 0);
761 for (i = 0; i < PTRS_PER_IOPTE; i++)
765 iopte_free(obj, iopte, true);
766 nent = 1; /* for the next L1 entry */
769 if ((*iopgd & IOPGD_SUPER) == IOPGD_SUPER) {
771 /* rewind to the 1st entry */
772 iopgd = iopgd_offset(obj, (da & IOSUPER_MASK));
776 memset(iopgd, 0, nent * sizeof(*iopgd));
777 flush_iopte_range(obj->dev, obj->pd_dma, pd_offset, nent);
783 * iopgtable_clear_entry - Remove an iommu pte entry
785 * @da: iommu device virtual address
787 static size_t iopgtable_clear_entry(struct omap_iommu *obj, u32 da)
791 spin_lock(&obj->page_table_lock);
793 bytes = iopgtable_clear_entry_core(obj, da);
794 flush_iotlb_page(obj, da);
796 spin_unlock(&obj->page_table_lock);
801 static void iopgtable_clear_entry_all(struct omap_iommu *obj)
803 unsigned long offset;
806 spin_lock(&obj->page_table_lock);
808 for (i = 0; i < PTRS_PER_IOPGD; i++) {
812 da = i << IOPGD_SHIFT;
813 iopgd = iopgd_offset(obj, da);
814 offset = iopgd_index(da) * sizeof(da);
819 if (iopgd_is_table(*iopgd))
820 iopte_free(obj, iopte_offset(iopgd, 0), true);
823 flush_iopte_range(obj->dev, obj->pd_dma, offset, 1);
826 flush_iotlb_all(obj);
828 spin_unlock(&obj->page_table_lock);
832 * Device IOMMU generic operations
834 static irqreturn_t iommu_fault_handler(int irq, void *data)
838 struct omap_iommu *obj = data;
839 struct iommu_domain *domain = obj->domain;
840 struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
842 if (!omap_domain->dev)
845 errs = iommu_report_fault(obj, &da);
849 /* Fault callback or TLB/PTE Dynamic loading */
850 if (!report_iommu_fault(domain, obj->dev, da, 0))
853 iommu_write_reg(obj, 0, MMU_IRQENABLE);
855 iopgd = iopgd_offset(obj, da);
857 if (!iopgd_is_table(*iopgd)) {
858 dev_err(obj->dev, "%s: errs:0x%08x da:0x%08x pgd:0x%p *pgd:px%08x\n",
859 obj->name, errs, da, iopgd, *iopgd);
863 iopte = iopte_offset(iopgd, da);
865 dev_err(obj->dev, "%s: errs:0x%08x da:0x%08x pgd:0x%p *pgd:0x%08x pte:0x%p *pte:0x%08x\n",
866 obj->name, errs, da, iopgd, *iopgd, iopte, *iopte);
872 * omap_iommu_attach() - attach iommu device to an iommu domain
873 * @obj: target omap iommu device
876 static int omap_iommu_attach(struct omap_iommu *obj, u32 *iopgd)
880 spin_lock(&obj->iommu_lock);
882 obj->pd_dma = dma_map_single(obj->dev, iopgd, IOPGD_TABLE_SIZE,
884 if (dma_mapping_error(obj->dev, obj->pd_dma)) {
885 dev_err(obj->dev, "DMA map error for L1 table\n");
891 err = iommu_enable(obj);
894 flush_iotlb_all(obj);
896 spin_unlock(&obj->iommu_lock);
898 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
903 spin_unlock(&obj->iommu_lock);
909 * omap_iommu_detach - release iommu device
912 static void omap_iommu_detach(struct omap_iommu *obj)
914 if (!obj || IS_ERR(obj))
917 spin_lock(&obj->iommu_lock);
919 dma_unmap_single(obj->dev, obj->pd_dma, IOPGD_TABLE_SIZE,
925 spin_unlock(&obj->iommu_lock);
927 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
930 static bool omap_iommu_can_register(struct platform_device *pdev)
932 struct device_node *np = pdev->dev.of_node;
934 if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu"))
938 * restrict IOMMU core registration only for processor-port MDMA MMUs
941 if ((!strcmp(dev_name(&pdev->dev), "40d01000.mmu")) ||
942 (!strcmp(dev_name(&pdev->dev), "41501000.mmu")))
948 static int omap_iommu_dra7_get_dsp_system_cfg(struct platform_device *pdev,
949 struct omap_iommu *obj)
951 struct device_node *np = pdev->dev.of_node;
954 if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu"))
957 if (!of_property_read_bool(np, "ti,syscon-mmuconfig")) {
958 dev_err(&pdev->dev, "ti,syscon-mmuconfig property is missing\n");
963 syscon_regmap_lookup_by_phandle(np, "ti,syscon-mmuconfig");
964 if (IS_ERR(obj->syscfg)) {
965 /* can fail with -EPROBE_DEFER */
966 ret = PTR_ERR(obj->syscfg);
970 if (of_property_read_u32_index(np, "ti,syscon-mmuconfig", 1,
972 dev_err(&pdev->dev, "couldn't get the IOMMU instance id within subsystem\n");
976 if (obj->id != 0 && obj->id != 1) {
977 dev_err(&pdev->dev, "invalid IOMMU instance id\n");
985 * OMAP Device MMU(IOMMU) detection
987 static int omap_iommu_probe(struct platform_device *pdev)
991 struct omap_iommu *obj;
992 struct resource *res;
993 struct device_node *of = pdev->dev.of_node;
996 pr_err("%s: only DT-based devices are supported\n", __func__);
1000 obj = devm_kzalloc(&pdev->dev, sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL);
1004 obj->name = dev_name(&pdev->dev);
1005 obj->nr_tlb_entries = 32;
1006 err = of_property_read_u32(of, "ti,#tlb-entries", &obj->nr_tlb_entries);
1007 if (err && err != -EINVAL)
1009 if (obj->nr_tlb_entries != 32 && obj->nr_tlb_entries != 8)
1011 if (of_find_property(of, "ti,iommu-bus-err-back", NULL))
1012 obj->has_bus_err_back = MMU_GP_REG_BUS_ERR_BACK_EN;
1014 obj->dev = &pdev->dev;
1015 obj->ctx = (void *)obj + sizeof(*obj);
1017 spin_lock_init(&obj->iommu_lock);
1018 spin_lock_init(&obj->page_table_lock);
1020 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1021 obj->regbase = devm_ioremap_resource(obj->dev, res);
1022 if (IS_ERR(obj->regbase))
1023 return PTR_ERR(obj->regbase);
1025 err = omap_iommu_dra7_get_dsp_system_cfg(pdev, obj);
1029 irq = platform_get_irq(pdev, 0);
1033 err = devm_request_irq(obj->dev, irq, iommu_fault_handler, IRQF_SHARED,
1034 dev_name(obj->dev), obj);
1037 platform_set_drvdata(pdev, obj);
1039 if (omap_iommu_can_register(pdev)) {
1040 obj->group = iommu_group_alloc();
1041 if (IS_ERR(obj->group))
1042 return PTR_ERR(obj->group);
1044 err = iommu_device_sysfs_add(&obj->iommu, obj->dev, NULL,
1049 iommu_device_set_ops(&obj->iommu, &omap_iommu_ops);
1051 err = iommu_device_register(&obj->iommu);
1056 pm_runtime_irq_safe(obj->dev);
1057 pm_runtime_enable(obj->dev);
1059 omap_iommu_debugfs_add(obj);
1061 dev_info(&pdev->dev, "%s registered\n", obj->name);
1066 iommu_device_sysfs_remove(&obj->iommu);
1068 iommu_group_put(obj->group);
1072 static int omap_iommu_remove(struct platform_device *pdev)
1074 struct omap_iommu *obj = platform_get_drvdata(pdev);
1077 iommu_group_put(obj->group);
1080 iommu_device_sysfs_remove(&obj->iommu);
1081 iommu_device_unregister(&obj->iommu);
1084 omap_iommu_debugfs_remove(obj);
1086 pm_runtime_disable(obj->dev);
1088 dev_info(&pdev->dev, "%s removed\n", obj->name);
1092 static const struct of_device_id omap_iommu_of_match[] = {
1093 { .compatible = "ti,omap2-iommu" },
1094 { .compatible = "ti,omap4-iommu" },
1095 { .compatible = "ti,dra7-iommu" },
1096 { .compatible = "ti,dra7-dsp-iommu" },
1100 static struct platform_driver omap_iommu_driver = {
1101 .probe = omap_iommu_probe,
1102 .remove = omap_iommu_remove,
1104 .name = "omap-iommu",
1105 .of_match_table = of_match_ptr(omap_iommu_of_match),
1109 static u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa, int pgsz)
1111 memset(e, 0, sizeof(*e));
1115 e->valid = MMU_CAM_V;
1117 e->endian = MMU_RAM_ENDIAN_LITTLE;
1118 e->elsz = MMU_RAM_ELSZ_8;
1121 return iopgsz_to_bytes(e->pgsz);
1124 static int omap_iommu_map(struct iommu_domain *domain, unsigned long da,
1125 phys_addr_t pa, size_t bytes, int prot)
1127 struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
1128 struct device *dev = omap_domain->dev;
1129 struct omap_iommu_device *iommu;
1130 struct omap_iommu *oiommu;
1131 struct iotlb_entry e;
1136 omap_pgsz = bytes_to_iopgsz(bytes);
1137 if (omap_pgsz < 0) {
1138 dev_err(dev, "invalid size to map: %d\n", bytes);
1142 dev_dbg(dev, "mapping da 0x%lx to pa %pa size 0x%x\n", da, &pa, bytes);
1144 iotlb_init_entry(&e, da, pa, omap_pgsz);
1146 iommu = omap_domain->iommus;
1147 for (i = 0; i < omap_domain->num_iommus; i++, iommu++) {
1148 oiommu = iommu->iommu_dev;
1149 ret = omap_iopgtable_store_entry(oiommu, &e);
1151 dev_err(dev, "omap_iopgtable_store_entry failed: %d\n",
1160 oiommu = iommu->iommu_dev;
1161 iopgtable_clear_entry(oiommu, da);
1168 static size_t omap_iommu_unmap(struct iommu_domain *domain, unsigned long da,
1171 struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
1172 struct device *dev = omap_domain->dev;
1173 struct omap_iommu_device *iommu;
1174 struct omap_iommu *oiommu;
1179 dev_dbg(dev, "unmapping da 0x%lx size %u\n", da, size);
1181 iommu = omap_domain->iommus;
1182 for (i = 0; i < omap_domain->num_iommus; i++, iommu++) {
1183 oiommu = iommu->iommu_dev;
1184 bytes = iopgtable_clear_entry(oiommu, da);
1190 * simplify return - we are only checking if any of the iommus
1191 * reported an error, but not if all of them are unmapping the
1192 * same number of entries. This should not occur due to the
1193 * mirror programming.
1195 return error ? 0 : bytes;
1198 static int omap_iommu_count(struct device *dev)
1200 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
1203 while (arch_data->iommu_dev) {
1211 /* caller should call cleanup if this function fails */
1212 static int omap_iommu_attach_init(struct device *dev,
1213 struct omap_iommu_domain *odomain)
1215 struct omap_iommu_device *iommu;
1218 odomain->num_iommus = omap_iommu_count(dev);
1219 if (!odomain->num_iommus)
1222 odomain->iommus = kcalloc(odomain->num_iommus, sizeof(*iommu),
1224 if (!odomain->iommus)
1227 iommu = odomain->iommus;
1228 for (i = 0; i < odomain->num_iommus; i++, iommu++) {
1229 iommu->pgtable = kzalloc(IOPGD_TABLE_SIZE, GFP_ATOMIC);
1230 if (!iommu->pgtable)
1234 * should never fail, but please keep this around to ensure
1235 * we keep the hardware happy
1237 if (WARN_ON(!IS_ALIGNED((long)iommu->pgtable,
1245 static void omap_iommu_detach_fini(struct omap_iommu_domain *odomain)
1248 struct omap_iommu_device *iommu = odomain->iommus;
1250 for (i = 0; iommu && i < odomain->num_iommus; i++, iommu++)
1251 kfree(iommu->pgtable);
1253 kfree(odomain->iommus);
1254 odomain->num_iommus = 0;
1255 odomain->iommus = NULL;
1259 omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
1261 struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
1262 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
1263 struct omap_iommu_device *iommu;
1264 struct omap_iommu *oiommu;
1268 if (!arch_data || !arch_data->iommu_dev) {
1269 dev_err(dev, "device doesn't have an associated iommu\n");
1273 spin_lock(&omap_domain->lock);
1275 /* only a single client device can be attached to a domain */
1276 if (omap_domain->dev) {
1277 dev_err(dev, "iommu domain is already attached\n");
1282 ret = omap_iommu_attach_init(dev, omap_domain);
1284 dev_err(dev, "failed to allocate required iommu data %d\n",
1289 iommu = omap_domain->iommus;
1290 for (i = 0; i < omap_domain->num_iommus; i++, iommu++, arch_data++) {
1291 /* configure and enable the omap iommu */
1292 oiommu = arch_data->iommu_dev;
1293 ret = omap_iommu_attach(oiommu, iommu->pgtable);
1295 dev_err(dev, "can't get omap iommu: %d\n", ret);
1299 oiommu->domain = domain;
1300 iommu->iommu_dev = oiommu;
1303 omap_domain->dev = dev;
1311 oiommu = iommu->iommu_dev;
1312 omap_iommu_detach(oiommu);
1313 iommu->iommu_dev = NULL;
1314 oiommu->domain = NULL;
1317 omap_iommu_detach_fini(omap_domain);
1319 spin_unlock(&omap_domain->lock);
1323 static void _omap_iommu_detach_dev(struct omap_iommu_domain *omap_domain,
1326 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
1327 struct omap_iommu_device *iommu = omap_domain->iommus;
1328 struct omap_iommu *oiommu;
1331 if (!omap_domain->dev) {
1332 dev_err(dev, "domain has no attached device\n");
1336 /* only a single device is supported per domain for now */
1337 if (omap_domain->dev != dev) {
1338 dev_err(dev, "invalid attached device\n");
1343 * cleanup in the reverse order of attachment - this addresses
1344 * any h/w dependencies between multiple instances, if any
1346 iommu += (omap_domain->num_iommus - 1);
1347 arch_data += (omap_domain->num_iommus - 1);
1348 for (i = 0; i < omap_domain->num_iommus; i++, iommu--, arch_data--) {
1349 oiommu = iommu->iommu_dev;
1350 iopgtable_clear_entry_all(oiommu);
1352 omap_iommu_detach(oiommu);
1353 iommu->iommu_dev = NULL;
1354 oiommu->domain = NULL;
1357 omap_iommu_detach_fini(omap_domain);
1359 omap_domain->dev = NULL;
1362 static void omap_iommu_detach_dev(struct iommu_domain *domain,
1365 struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
1367 spin_lock(&omap_domain->lock);
1368 _omap_iommu_detach_dev(omap_domain, dev);
1369 spin_unlock(&omap_domain->lock);
1372 static struct iommu_domain *omap_iommu_domain_alloc(unsigned type)
1374 struct omap_iommu_domain *omap_domain;
1376 if (type != IOMMU_DOMAIN_UNMANAGED)
1379 omap_domain = kzalloc(sizeof(*omap_domain), GFP_KERNEL);
1383 spin_lock_init(&omap_domain->lock);
1385 omap_domain->domain.geometry.aperture_start = 0;
1386 omap_domain->domain.geometry.aperture_end = (1ULL << 32) - 1;
1387 omap_domain->domain.geometry.force_aperture = true;
1389 return &omap_domain->domain;
1392 static void omap_iommu_domain_free(struct iommu_domain *domain)
1394 struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
1397 * An iommu device is still attached
1398 * (currently, only one device can be attached) ?
1400 if (omap_domain->dev)
1401 _omap_iommu_detach_dev(omap_domain, omap_domain->dev);
1406 static phys_addr_t omap_iommu_iova_to_phys(struct iommu_domain *domain,
1409 struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
1410 struct omap_iommu_device *iommu = omap_domain->iommus;
1411 struct omap_iommu *oiommu = iommu->iommu_dev;
1412 struct device *dev = oiommu->dev;
1414 phys_addr_t ret = 0;
1417 * all the iommus within the domain will have identical programming,
1418 * so perform the lookup using just the first iommu
1420 iopgtable_lookup_entry(oiommu, da, &pgd, &pte);
1423 if (iopte_is_small(*pte))
1424 ret = omap_iommu_translate(*pte, da, IOPTE_MASK);
1425 else if (iopte_is_large(*pte))
1426 ret = omap_iommu_translate(*pte, da, IOLARGE_MASK);
1428 dev_err(dev, "bogus pte 0x%x, da 0x%llx", *pte,
1429 (unsigned long long)da);
1431 if (iopgd_is_section(*pgd))
1432 ret = omap_iommu_translate(*pgd, da, IOSECTION_MASK);
1433 else if (iopgd_is_super(*pgd))
1434 ret = omap_iommu_translate(*pgd, da, IOSUPER_MASK);
1436 dev_err(dev, "bogus pgd 0x%x, da 0x%llx", *pgd,
1437 (unsigned long long)da);
1443 static int omap_iommu_add_device(struct device *dev)
1445 struct omap_iommu_arch_data *arch_data, *tmp;
1446 struct omap_iommu *oiommu;
1447 struct iommu_group *group;
1448 struct device_node *np;
1449 struct platform_device *pdev;
1454 * Allocate the archdata iommu structure for DT-based devices.
1456 * TODO: Simplify this when removing non-DT support completely from the
1463 * retrieve the count of IOMMU nodes using phandle size as element size
1464 * since #iommu-cells = 0 for OMAP
1466 num_iommus = of_property_count_elems_of_size(dev->of_node, "iommus",
1471 arch_data = kcalloc(num_iommus + 1, sizeof(*arch_data), GFP_KERNEL);
1475 for (i = 0, tmp = arch_data; i < num_iommus; i++, tmp++) {
1476 np = of_parse_phandle(dev->of_node, "iommus", i);
1482 pdev = of_find_device_by_node(np);
1483 if (WARN_ON(!pdev)) {
1489 oiommu = platform_get_drvdata(pdev);
1496 tmp->iommu_dev = oiommu;
1502 * use the first IOMMU alone for the sysfs device linking.
1503 * TODO: Evaluate if a single iommu_group needs to be
1504 * maintained for both IOMMUs
1506 oiommu = arch_data->iommu_dev;
1507 ret = iommu_device_link(&oiommu->iommu, dev);
1513 dev->archdata.iommu = arch_data;
1516 * IOMMU group initialization calls into omap_iommu_device_group, which
1517 * needs a valid dev->archdata.iommu pointer
1519 group = iommu_group_get_for_dev(dev);
1520 if (IS_ERR(group)) {
1521 iommu_device_unlink(&oiommu->iommu, dev);
1522 dev->archdata.iommu = NULL;
1524 return PTR_ERR(group);
1526 iommu_group_put(group);
1531 static void omap_iommu_remove_device(struct device *dev)
1533 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
1535 if (!dev->of_node || !arch_data)
1538 iommu_device_unlink(&arch_data->iommu_dev->iommu, dev);
1539 iommu_group_remove_device(dev);
1541 dev->archdata.iommu = NULL;
1546 static struct iommu_group *omap_iommu_device_group(struct device *dev)
1548 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
1549 struct iommu_group *group = ERR_PTR(-EINVAL);
1551 if (arch_data->iommu_dev)
1552 group = iommu_group_ref_get(arch_data->iommu_dev->group);
1557 static const struct iommu_ops omap_iommu_ops = {
1558 .domain_alloc = omap_iommu_domain_alloc,
1559 .domain_free = omap_iommu_domain_free,
1560 .attach_dev = omap_iommu_attach_dev,
1561 .detach_dev = omap_iommu_detach_dev,
1562 .map = omap_iommu_map,
1563 .unmap = omap_iommu_unmap,
1564 .iova_to_phys = omap_iommu_iova_to_phys,
1565 .add_device = omap_iommu_add_device,
1566 .remove_device = omap_iommu_remove_device,
1567 .device_group = omap_iommu_device_group,
1568 .pgsize_bitmap = OMAP_IOMMU_PGSIZES,
1571 static int __init omap_iommu_init(void)
1573 struct kmem_cache *p;
1574 const unsigned long flags = SLAB_HWCACHE_ALIGN;
1575 size_t align = 1 << 10; /* L2 pagetable alignement */
1576 struct device_node *np;
1579 np = of_find_matching_node(NULL, omap_iommu_of_match);
1585 p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags,
1591 omap_iommu_debugfs_init();
1593 ret = platform_driver_register(&omap_iommu_driver);
1595 pr_err("%s: failed to register driver\n", __func__);
1599 ret = bus_set_iommu(&platform_bus_type, &omap_iommu_ops);
1606 platform_driver_unregister(&omap_iommu_driver);
1608 kmem_cache_destroy(iopte_cachep);
1611 subsys_initcall(omap_iommu_init);
1612 /* must be ready before omap3isp is probed */