2 * IOMMU API for QCOM secure IOMMUs. Somewhat based on arm-smmu.c
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 * Copyright (C) 2013 ARM Limited
17 * Copyright (C) 2017 Red Hat
20 #include <linux/atomic.h>
21 #include <linux/clk.h>
22 #include <linux/delay.h>
23 #include <linux/dma-iommu.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/err.h>
26 #include <linux/interrupt.h>
28 #include <linux/io-64-nonatomic-hi-lo.h>
29 #include <linux/iommu.h>
30 #include <linux/iopoll.h>
31 #include <linux/kconfig.h>
32 #include <linux/module.h>
33 #include <linux/mutex.h>
35 #include <linux/of_address.h>
36 #include <linux/of_device.h>
37 #include <linux/of_iommu.h>
38 #include <linux/platform_device.h>
40 #include <linux/pm_runtime.h>
41 #include <linux/qcom_scm.h>
42 #include <linux/slab.h>
43 #include <linux/spinlock.h>
45 #include "io-pgtable.h"
46 #include "arm-smmu-regs.h"
48 #define SMMU_INTR_SEL_NS 0x2000
50 struct qcom_iommu_ctx;
52 struct qcom_iommu_dev {
53 /* IOMMU core code handle */
54 struct iommu_device iommu;
56 struct clk *iface_clk;
58 void __iomem *local_base;
61 struct qcom_iommu_ctx *ctxs[0]; /* indexed by asid-1 */
64 struct qcom_iommu_ctx {
68 u8 asid; /* asid and ctx bank # are 1:1 */
71 struct qcom_iommu_domain {
72 struct io_pgtable_ops *pgtbl_ops;
73 spinlock_t pgtbl_lock;
74 struct mutex init_mutex; /* Protects iommu pointer */
75 struct iommu_domain domain;
76 struct qcom_iommu_dev *iommu;
79 static struct qcom_iommu_domain *to_qcom_iommu_domain(struct iommu_domain *dom)
81 return container_of(dom, struct qcom_iommu_domain, domain);
84 static const struct iommu_ops qcom_iommu_ops;
86 static struct qcom_iommu_dev * to_iommu(struct iommu_fwspec *fwspec)
88 if (!fwspec || fwspec->ops != &qcom_iommu_ops)
90 return fwspec->iommu_priv;
93 static struct qcom_iommu_ctx * to_ctx(struct iommu_fwspec *fwspec, unsigned asid)
95 struct qcom_iommu_dev *qcom_iommu = to_iommu(fwspec);
98 return qcom_iommu->ctxs[asid - 1];
102 iommu_writel(struct qcom_iommu_ctx *ctx, unsigned reg, u32 val)
104 writel_relaxed(val, ctx->base + reg);
108 iommu_writeq(struct qcom_iommu_ctx *ctx, unsigned reg, u64 val)
110 writeq_relaxed(val, ctx->base + reg);
114 iommu_readl(struct qcom_iommu_ctx *ctx, unsigned reg)
116 return readl_relaxed(ctx->base + reg);
120 iommu_readq(struct qcom_iommu_ctx *ctx, unsigned reg)
122 return readq_relaxed(ctx->base + reg);
125 static void qcom_iommu_tlb_sync(void *cookie)
127 struct iommu_fwspec *fwspec = cookie;
130 for (i = 0; i < fwspec->num_ids; i++) {
131 struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
132 unsigned int val, ret;
134 iommu_writel(ctx, ARM_SMMU_CB_TLBSYNC, 0);
136 ret = readl_poll_timeout(ctx->base + ARM_SMMU_CB_TLBSTATUS, val,
137 (val & 0x1) == 0, 0, 5000000);
139 dev_err(ctx->dev, "timeout waiting for TLB SYNC\n");
143 static void qcom_iommu_tlb_inv_context(void *cookie)
145 struct iommu_fwspec *fwspec = cookie;
148 for (i = 0; i < fwspec->num_ids; i++) {
149 struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
150 iommu_writel(ctx, ARM_SMMU_CB_S1_TLBIASID, ctx->asid);
153 qcom_iommu_tlb_sync(cookie);
156 static void qcom_iommu_tlb_inv_range_nosync(unsigned long iova, size_t size,
157 size_t granule, bool leaf, void *cookie)
159 struct iommu_fwspec *fwspec = cookie;
162 reg = leaf ? ARM_SMMU_CB_S1_TLBIVAL : ARM_SMMU_CB_S1_TLBIVA;
164 for (i = 0; i < fwspec->num_ids; i++) {
165 struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
171 iommu_writel(ctx, reg, iova);
173 } while (s -= granule);
177 static const struct iommu_gather_ops qcom_gather_ops = {
178 .tlb_flush_all = qcom_iommu_tlb_inv_context,
179 .tlb_add_flush = qcom_iommu_tlb_inv_range_nosync,
180 .tlb_sync = qcom_iommu_tlb_sync,
183 static irqreturn_t qcom_iommu_fault(int irq, void *dev)
185 struct qcom_iommu_ctx *ctx = dev;
189 fsr = iommu_readl(ctx, ARM_SMMU_CB_FSR);
191 if (!(fsr & FSR_FAULT))
194 fsynr = iommu_readl(ctx, ARM_SMMU_CB_FSYNR0);
195 iova = iommu_readq(ctx, ARM_SMMU_CB_FAR);
197 dev_err_ratelimited(ctx->dev,
198 "Unhandled context fault: fsr=0x%x, "
199 "iova=0x%016llx, fsynr=0x%x, cb=%d\n",
200 fsr, iova, fsynr, ctx->asid);
202 iommu_writel(ctx, ARM_SMMU_CB_FSR, fsr);
207 static int qcom_iommu_init_domain(struct iommu_domain *domain,
208 struct qcom_iommu_dev *qcom_iommu,
209 struct iommu_fwspec *fwspec)
211 struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
212 struct io_pgtable_ops *pgtbl_ops;
213 struct io_pgtable_cfg pgtbl_cfg;
217 mutex_lock(&qcom_domain->init_mutex);
218 if (qcom_domain->iommu)
221 pgtbl_cfg = (struct io_pgtable_cfg) {
222 .pgsize_bitmap = qcom_iommu_ops.pgsize_bitmap,
225 .tlb = &qcom_gather_ops,
226 .iommu_dev = qcom_iommu->dev,
229 qcom_domain->iommu = qcom_iommu;
230 pgtbl_ops = alloc_io_pgtable_ops(ARM_32_LPAE_S1, &pgtbl_cfg, fwspec);
232 dev_err(qcom_iommu->dev, "failed to allocate pagetable ops\n");
234 goto out_clear_iommu;
237 /* Update the domain's page sizes to reflect the page table format */
238 domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
239 domain->geometry.aperture_end = (1ULL << pgtbl_cfg.ias) - 1;
240 domain->geometry.force_aperture = true;
242 for (i = 0; i < fwspec->num_ids; i++) {
243 struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
245 if (!ctx->secure_init) {
246 ret = qcom_scm_restore_sec_cfg(qcom_iommu->sec_id, ctx->asid);
248 dev_err(qcom_iommu->dev, "secure init failed: %d\n", ret);
249 goto out_clear_iommu;
251 ctx->secure_init = true;
255 iommu_writeq(ctx, ARM_SMMU_CB_TTBR0,
256 pgtbl_cfg.arm_lpae_s1_cfg.ttbr[0] |
257 ((u64)ctx->asid << TTBRn_ASID_SHIFT));
258 iommu_writeq(ctx, ARM_SMMU_CB_TTBR1,
259 pgtbl_cfg.arm_lpae_s1_cfg.ttbr[1] |
260 ((u64)ctx->asid << TTBRn_ASID_SHIFT));
263 iommu_writel(ctx, ARM_SMMU_CB_TTBCR2,
264 (pgtbl_cfg.arm_lpae_s1_cfg.tcr >> 32) |
265 TTBCR2_SEP_UPSTREAM);
266 iommu_writel(ctx, ARM_SMMU_CB_TTBCR,
267 pgtbl_cfg.arm_lpae_s1_cfg.tcr);
269 /* MAIRs (stage-1 only) */
270 iommu_writel(ctx, ARM_SMMU_CB_S1_MAIR0,
271 pgtbl_cfg.arm_lpae_s1_cfg.mair[0]);
272 iommu_writel(ctx, ARM_SMMU_CB_S1_MAIR1,
273 pgtbl_cfg.arm_lpae_s1_cfg.mair[1]);
276 reg = SCTLR_CFIE | SCTLR_CFRE | SCTLR_AFE | SCTLR_TRE |
277 SCTLR_M | SCTLR_S1_ASIDPNE;
279 if (IS_ENABLED(CONFIG_BIG_ENDIAN))
282 iommu_writel(ctx, ARM_SMMU_CB_SCTLR, reg);
285 mutex_unlock(&qcom_domain->init_mutex);
287 /* Publish page table ops for map/unmap */
288 qcom_domain->pgtbl_ops = pgtbl_ops;
293 qcom_domain->iommu = NULL;
295 mutex_unlock(&qcom_domain->init_mutex);
299 static struct iommu_domain *qcom_iommu_domain_alloc(unsigned type)
301 struct qcom_iommu_domain *qcom_domain;
303 if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
306 * Allocate the domain and initialise some of its data structures.
307 * We can't really do anything meaningful until we've added a
310 qcom_domain = kzalloc(sizeof(*qcom_domain), GFP_KERNEL);
314 if (type == IOMMU_DOMAIN_DMA &&
315 iommu_get_dma_cookie(&qcom_domain->domain)) {
320 mutex_init(&qcom_domain->init_mutex);
321 spin_lock_init(&qcom_domain->pgtbl_lock);
323 return &qcom_domain->domain;
326 static void qcom_iommu_domain_free(struct iommu_domain *domain)
328 struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
330 if (WARN_ON(qcom_domain->iommu)) /* forgot to detach? */
333 iommu_put_dma_cookie(domain);
335 /* NOTE: unmap can be called after client device is powered off,
336 * for example, with GPUs or anything involving dma-buf. So we
337 * cannot rely on the device_link. Make sure the IOMMU is on to
338 * avoid unclocked accesses in the TLB inv path:
340 pm_runtime_get_sync(qcom_domain->iommu->dev);
342 free_io_pgtable_ops(qcom_domain->pgtbl_ops);
344 pm_runtime_put_sync(qcom_domain->iommu->dev);
349 static int qcom_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
351 struct qcom_iommu_dev *qcom_iommu = to_iommu(dev->iommu_fwspec);
352 struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
356 dev_err(dev, "cannot attach to IOMMU, is it on the same bus?\n");
360 /* Ensure that the domain is finalized */
361 pm_runtime_get_sync(qcom_iommu->dev);
362 ret = qcom_iommu_init_domain(domain, qcom_iommu, dev->iommu_fwspec);
363 pm_runtime_put_sync(qcom_iommu->dev);
368 * Sanity check the domain. We don't support domains across
371 if (qcom_domain->iommu != qcom_iommu) {
372 dev_err(dev, "cannot attach to IOMMU %s while already "
373 "attached to domain on IOMMU %s\n",
374 dev_name(qcom_domain->iommu->dev),
375 dev_name(qcom_iommu->dev));
382 static void qcom_iommu_detach_dev(struct iommu_domain *domain, struct device *dev)
384 struct iommu_fwspec *fwspec = dev->iommu_fwspec;
385 struct qcom_iommu_dev *qcom_iommu = to_iommu(fwspec);
386 struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
389 if (!qcom_domain->iommu)
392 pm_runtime_get_sync(qcom_iommu->dev);
393 for (i = 0; i < fwspec->num_ids; i++) {
394 struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
396 /* Disable the context bank: */
397 iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0);
399 pm_runtime_put_sync(qcom_iommu->dev);
401 qcom_domain->iommu = NULL;
404 static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova,
405 phys_addr_t paddr, size_t size, int prot)
409 struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
410 struct io_pgtable_ops *ops = qcom_domain->pgtbl_ops;
415 spin_lock_irqsave(&qcom_domain->pgtbl_lock, flags);
416 ret = ops->map(ops, iova, paddr, size, prot);
417 spin_unlock_irqrestore(&qcom_domain->pgtbl_lock, flags);
421 static size_t qcom_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
426 struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
427 struct io_pgtable_ops *ops = qcom_domain->pgtbl_ops;
432 /* NOTE: unmap can be called after client device is powered off,
433 * for example, with GPUs or anything involving dma-buf. So we
434 * cannot rely on the device_link. Make sure the IOMMU is on to
435 * avoid unclocked accesses in the TLB inv path:
437 pm_runtime_get_sync(qcom_domain->iommu->dev);
438 spin_lock_irqsave(&qcom_domain->pgtbl_lock, flags);
439 ret = ops->unmap(ops, iova, size);
440 spin_unlock_irqrestore(&qcom_domain->pgtbl_lock, flags);
441 pm_runtime_put_sync(qcom_domain->iommu->dev);
446 static void qcom_iommu_iotlb_sync(struct iommu_domain *domain)
448 struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
449 struct io_pgtable *pgtable = container_of(qcom_domain->pgtbl_ops,
450 struct io_pgtable, ops);
451 if (!qcom_domain->pgtbl_ops)
454 pm_runtime_get_sync(qcom_domain->iommu->dev);
455 qcom_iommu_tlb_sync(pgtable->cookie);
456 pm_runtime_put_sync(qcom_domain->iommu->dev);
459 static phys_addr_t qcom_iommu_iova_to_phys(struct iommu_domain *domain,
464 struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
465 struct io_pgtable_ops *ops = qcom_domain->pgtbl_ops;
470 spin_lock_irqsave(&qcom_domain->pgtbl_lock, flags);
471 ret = ops->iova_to_phys(ops, iova);
472 spin_unlock_irqrestore(&qcom_domain->pgtbl_lock, flags);
477 static bool qcom_iommu_capable(enum iommu_cap cap)
480 case IOMMU_CAP_CACHE_COHERENCY:
482 * Return true here as the SMMU can always send out coherent
486 case IOMMU_CAP_NOEXEC:
493 static int qcom_iommu_add_device(struct device *dev)
495 struct qcom_iommu_dev *qcom_iommu = to_iommu(dev->iommu_fwspec);
496 struct iommu_group *group;
497 struct device_link *link;
503 * Establish the link between iommu and master, so that the
504 * iommu gets runtime enabled/disabled as per the master's
507 link = device_link_add(dev, qcom_iommu->dev, DL_FLAG_PM_RUNTIME);
509 dev_err(qcom_iommu->dev, "Unable to create device link between %s and %s\n",
510 dev_name(qcom_iommu->dev), dev_name(dev));
514 group = iommu_group_get_for_dev(dev);
515 if (IS_ERR_OR_NULL(group))
516 return PTR_ERR_OR_ZERO(group);
518 iommu_group_put(group);
519 iommu_device_link(&qcom_iommu->iommu, dev);
524 static void qcom_iommu_remove_device(struct device *dev)
526 struct qcom_iommu_dev *qcom_iommu = to_iommu(dev->iommu_fwspec);
531 iommu_device_unlink(&qcom_iommu->iommu, dev);
532 iommu_group_remove_device(dev);
533 iommu_fwspec_free(dev);
536 static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
538 struct qcom_iommu_dev *qcom_iommu;
539 struct platform_device *iommu_pdev;
540 unsigned asid = args->args[0];
542 if (args->args_count != 1) {
543 dev_err(dev, "incorrect number of iommu params found for %s "
544 "(found %d, expected 1)\n",
545 args->np->full_name, args->args_count);
549 iommu_pdev = of_find_device_by_node(args->np);
550 if (WARN_ON(!iommu_pdev))
553 qcom_iommu = platform_get_drvdata(iommu_pdev);
555 /* make sure the asid specified in dt is valid, so we don't have
556 * to sanity check this elsewhere, since 'asid - 1' is used to
557 * index into qcom_iommu->ctxs:
559 if (WARN_ON(asid < 1) ||
560 WARN_ON(asid > qcom_iommu->num_ctxs))
563 if (!dev->iommu_fwspec->iommu_priv) {
564 dev->iommu_fwspec->iommu_priv = qcom_iommu;
566 /* make sure devices iommus dt node isn't referring to
567 * multiple different iommu devices. Multiple context
568 * banks are ok, but multiple devices are not:
570 if (WARN_ON(qcom_iommu != dev->iommu_fwspec->iommu_priv))
574 return iommu_fwspec_add_ids(dev, &asid, 1);
577 static const struct iommu_ops qcom_iommu_ops = {
578 .capable = qcom_iommu_capable,
579 .domain_alloc = qcom_iommu_domain_alloc,
580 .domain_free = qcom_iommu_domain_free,
581 .attach_dev = qcom_iommu_attach_dev,
582 .detach_dev = qcom_iommu_detach_dev,
583 .map = qcom_iommu_map,
584 .unmap = qcom_iommu_unmap,
585 .map_sg = default_iommu_map_sg,
586 .flush_iotlb_all = qcom_iommu_iotlb_sync,
587 .iotlb_sync = qcom_iommu_iotlb_sync,
588 .iova_to_phys = qcom_iommu_iova_to_phys,
589 .add_device = qcom_iommu_add_device,
590 .remove_device = qcom_iommu_remove_device,
591 .device_group = generic_device_group,
592 .of_xlate = qcom_iommu_of_xlate,
593 .pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
596 static int qcom_iommu_enable_clocks(struct qcom_iommu_dev *qcom_iommu)
600 ret = clk_prepare_enable(qcom_iommu->iface_clk);
602 dev_err(qcom_iommu->dev, "Couldn't enable iface_clk\n");
606 ret = clk_prepare_enable(qcom_iommu->bus_clk);
608 dev_err(qcom_iommu->dev, "Couldn't enable bus_clk\n");
609 clk_disable_unprepare(qcom_iommu->iface_clk);
616 static void qcom_iommu_disable_clocks(struct qcom_iommu_dev *qcom_iommu)
618 clk_disable_unprepare(qcom_iommu->bus_clk);
619 clk_disable_unprepare(qcom_iommu->iface_clk);
622 static int qcom_iommu_sec_ptbl_init(struct device *dev)
625 unsigned int spare = 0;
629 static bool allocated = false;
635 ret = qcom_scm_iommu_secure_ptbl_size(spare, &psize);
637 dev_err(dev, "failed to get iommu secure pgtable size (%d)\n",
642 dev_info(dev, "iommu sec: pgtable size: %zu\n", psize);
644 attrs = DMA_ATTR_NO_KERNEL_MAPPING;
646 cpu_addr = dma_alloc_attrs(dev, psize, &paddr, GFP_KERNEL, attrs);
648 dev_err(dev, "failed to allocate %zu bytes for pgtable\n",
653 ret = qcom_scm_iommu_secure_ptbl_init(paddr, psize, spare);
655 dev_err(dev, "failed to init iommu pgtable (%d)\n", ret);
663 dma_free_attrs(dev, psize, cpu_addr, paddr, attrs);
667 static int get_asid(const struct device_node *np)
671 /* read the "reg" property directly to get the relative address
672 * of the context bank, and calculate the asid from that:
674 if (of_property_read_u32_index(np, "reg", 0, ®))
677 return reg / 0x1000; /* context banks are 0x1000 apart */
680 static int qcom_iommu_ctx_probe(struct platform_device *pdev)
682 struct qcom_iommu_ctx *ctx;
683 struct device *dev = &pdev->dev;
684 struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(dev->parent);
685 struct resource *res;
688 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
693 platform_set_drvdata(pdev, ctx);
695 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
696 ctx->base = devm_ioremap_resource(dev, res);
697 if (IS_ERR(ctx->base))
698 return PTR_ERR(ctx->base);
700 irq = platform_get_irq(pdev, 0);
702 dev_err(dev, "failed to get irq\n");
706 /* clear IRQs before registering fault handler, just in case the
707 * boot-loader left us a surprise:
709 iommu_writel(ctx, ARM_SMMU_CB_FSR, iommu_readl(ctx, ARM_SMMU_CB_FSR));
711 ret = devm_request_irq(dev, irq,
717 dev_err(dev, "failed to request IRQ %u\n", irq);
721 ret = get_asid(dev->of_node);
723 dev_err(dev, "missing reg property\n");
729 dev_dbg(dev, "found asid %u\n", ctx->asid);
731 qcom_iommu->ctxs[ctx->asid - 1] = ctx;
736 static int qcom_iommu_ctx_remove(struct platform_device *pdev)
738 struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(pdev->dev.parent);
739 struct qcom_iommu_ctx *ctx = platform_get_drvdata(pdev);
741 platform_set_drvdata(pdev, NULL);
743 qcom_iommu->ctxs[ctx->asid - 1] = NULL;
748 static const struct of_device_id ctx_of_match[] = {
749 { .compatible = "qcom,msm-iommu-v1-ns" },
750 { .compatible = "qcom,msm-iommu-v1-sec" },
754 static struct platform_driver qcom_iommu_ctx_driver = {
756 .name = "qcom-iommu-ctx",
757 .of_match_table = of_match_ptr(ctx_of_match),
759 .probe = qcom_iommu_ctx_probe,
760 .remove = qcom_iommu_ctx_remove,
763 static bool qcom_iommu_has_secure_context(struct qcom_iommu_dev *qcom_iommu)
765 struct device_node *child;
767 for_each_child_of_node(qcom_iommu->dev->of_node, child)
768 if (of_device_is_compatible(child, "qcom,msm-iommu-v1-sec"))
774 static int qcom_iommu_device_probe(struct platform_device *pdev)
776 struct device_node *child;
777 struct qcom_iommu_dev *qcom_iommu;
778 struct device *dev = &pdev->dev;
779 struct resource *res;
780 int ret, sz, max_asid = 0;
782 /* find the max asid (which is 1:1 to ctx bank idx), so we know how
783 * many child ctx devices we have:
785 for_each_child_of_node(dev->of_node, child)
786 max_asid = max(max_asid, get_asid(child));
788 sz = sizeof(*qcom_iommu) + (max_asid * sizeof(qcom_iommu->ctxs[0]));
790 qcom_iommu = devm_kzalloc(dev, sz, GFP_KERNEL);
793 qcom_iommu->num_ctxs = max_asid;
794 qcom_iommu->dev = dev;
796 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
798 qcom_iommu->local_base = devm_ioremap_resource(dev, res);
800 qcom_iommu->iface_clk = devm_clk_get(dev, "iface");
801 if (IS_ERR(qcom_iommu->iface_clk)) {
802 dev_err(dev, "failed to get iface clock\n");
803 return PTR_ERR(qcom_iommu->iface_clk);
806 qcom_iommu->bus_clk = devm_clk_get(dev, "bus");
807 if (IS_ERR(qcom_iommu->bus_clk)) {
808 dev_err(dev, "failed to get bus clock\n");
809 return PTR_ERR(qcom_iommu->bus_clk);
812 if (of_property_read_u32(dev->of_node, "qcom,iommu-secure-id",
813 &qcom_iommu->sec_id)) {
814 dev_err(dev, "missing qcom,iommu-secure-id property\n");
818 if (qcom_iommu_has_secure_context(qcom_iommu)) {
819 ret = qcom_iommu_sec_ptbl_init(dev);
821 dev_err(dev, "cannot init secure pg table(%d)\n", ret);
826 platform_set_drvdata(pdev, qcom_iommu);
828 pm_runtime_enable(dev);
830 /* register context bank devices, which are child nodes: */
831 ret = devm_of_platform_populate(dev);
833 dev_err(dev, "Failed to populate iommu contexts\n");
837 ret = iommu_device_sysfs_add(&qcom_iommu->iommu, dev, NULL,
840 dev_err(dev, "Failed to register iommu in sysfs\n");
844 iommu_device_set_ops(&qcom_iommu->iommu, &qcom_iommu_ops);
845 iommu_device_set_fwnode(&qcom_iommu->iommu, dev->fwnode);
847 ret = iommu_device_register(&qcom_iommu->iommu);
849 dev_err(dev, "Failed to register iommu\n");
853 bus_set_iommu(&platform_bus_type, &qcom_iommu_ops);
855 if (qcom_iommu->local_base) {
856 pm_runtime_get_sync(dev);
857 writel_relaxed(0xffffffff, qcom_iommu->local_base + SMMU_INTR_SEL_NS);
858 pm_runtime_put_sync(dev);
864 static int qcom_iommu_device_remove(struct platform_device *pdev)
866 struct qcom_iommu_dev *qcom_iommu = platform_get_drvdata(pdev);
868 bus_set_iommu(&platform_bus_type, NULL);
870 pm_runtime_force_suspend(&pdev->dev);
871 platform_set_drvdata(pdev, NULL);
872 iommu_device_sysfs_remove(&qcom_iommu->iommu);
873 iommu_device_unregister(&qcom_iommu->iommu);
878 static int __maybe_unused qcom_iommu_resume(struct device *dev)
880 struct platform_device *pdev = to_platform_device(dev);
881 struct qcom_iommu_dev *qcom_iommu = platform_get_drvdata(pdev);
883 return qcom_iommu_enable_clocks(qcom_iommu);
886 static int __maybe_unused qcom_iommu_suspend(struct device *dev)
888 struct platform_device *pdev = to_platform_device(dev);
889 struct qcom_iommu_dev *qcom_iommu = platform_get_drvdata(pdev);
891 qcom_iommu_disable_clocks(qcom_iommu);
896 static const struct dev_pm_ops qcom_iommu_pm_ops = {
897 SET_RUNTIME_PM_OPS(qcom_iommu_suspend, qcom_iommu_resume, NULL)
898 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
899 pm_runtime_force_resume)
902 static const struct of_device_id qcom_iommu_of_match[] = {
903 { .compatible = "qcom,msm-iommu-v1" },
906 MODULE_DEVICE_TABLE(of, qcom_iommu_of_match);
908 static struct platform_driver qcom_iommu_driver = {
910 .name = "qcom-iommu",
911 .of_match_table = of_match_ptr(qcom_iommu_of_match),
912 .pm = &qcom_iommu_pm_ops,
914 .probe = qcom_iommu_device_probe,
915 .remove = qcom_iommu_device_remove,
918 static int __init qcom_iommu_init(void)
922 ret = platform_driver_register(&qcom_iommu_ctx_driver);
926 ret = platform_driver_register(&qcom_iommu_driver);
928 platform_driver_unregister(&qcom_iommu_ctx_driver);
933 static void __exit qcom_iommu_exit(void)
935 platform_driver_unregister(&qcom_iommu_driver);
936 platform_driver_unregister(&qcom_iommu_ctx_driver);
939 module_init(qcom_iommu_init);
940 module_exit(qcom_iommu_exit);
942 IOMMU_OF_DECLARE(qcom_iommu_dev, "qcom,msm-iommu-v1", NULL);
944 MODULE_DESCRIPTION("IOMMU API for QCOM IOMMU v1 implementations");
945 MODULE_LICENSE("GPL v2");