diff options
Diffstat (limited to 'drivers/iommu/msm_iommu.c')
| -rw-r--r-- | drivers/iommu/msm_iommu.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c index bc1a4e3a7042..792b3526b4a5 100644 --- a/drivers/iommu/msm_iommu.c +++ b/drivers/iommu/msm_iommu.c @@ -27,6 +27,7 @@ #include <linux/slab.h> #include <linux/iommu.h> #include <linux/clk.h> +#include <linux/err.h> #include <asm/cacheflush.h> #include <asm/sizes.h> @@ -85,6 +86,47 @@ static void __disable_clocks(struct msm_iommu_dev *iommu) clk_disable(iommu->pclk); } +static void msm_iommu_reset(void __iomem *base, int ncb) +{ + int ctx; + + SET_RPUE(base, 0); + SET_RPUEIE(base, 0); + SET_ESRRESTORE(base, 0); + SET_TBE(base, 0); + SET_CR(base, 0); + SET_SPDMBE(base, 0); + SET_TESTBUSCR(base, 0); + SET_TLBRSW(base, 0); + SET_GLOBAL_TLBIALL(base, 0); + SET_RPU_ACR(base, 0); + SET_TLBLKCRWE(base, 1); + + for (ctx = 0; ctx < ncb; ctx++) { + SET_BPRCOSH(base, ctx, 0); + SET_BPRCISH(base, ctx, 0); + SET_BPRCNSH(base, ctx, 0); + SET_BPSHCFG(base, ctx, 0); + SET_BPMTCFG(base, ctx, 0); + SET_ACTLR(base, ctx, 0); + SET_SCTLR(base, ctx, 0); + SET_FSRRESTORE(base, ctx, 0); + SET_TTBR0(base, ctx, 0); + SET_TTBR1(base, ctx, 0); + SET_TTBCR(base, ctx, 0); + SET_BFBCR(base, ctx, 0); + SET_PAR(base, ctx, 0); + SET_FAR(base, ctx, 0); + SET_CTX_TLBIALL(base, ctx, 0); + SET_TLBFLPTER(base, ctx, 0); + SET_TLBSLPTER(base, ctx, 0); + SET_TLBLKCR(base, ctx, 0); + SET_PRRR(base, ctx, 0); + SET_NMRR(base, ctx, 0); + SET_CONTEXTIDR(base, ctx, 0); + } +} + static int __flush_iotlb(struct iommu_domain *domain) { struct msm_priv *priv = to_msm_priv(domain); @@ -708,6 +750,146 @@ static const struct iommu_ops msm_iommu_ops = { .pgsize_bitmap = MSM_IOMMU_PGSIZES, }; +static int msm_iommu_probe(struct platform_device *pdev) +{ + struct resource *r; + struct msm_iommu_dev *iommu; + int ret, par, val; + + iommu = devm_kzalloc(&pdev->dev, sizeof(*iommu), GFP_KERNEL); + if (!iommu) + return -ENODEV; + + iommu->dev = &pdev->dev; + INIT_LIST_HEAD(&iommu->ctx_list); + + iommu->pclk = devm_clk_get(iommu->dev, "smmu_pclk"); + if (IS_ERR(iommu->pclk)) { + dev_err(iommu->dev, "could not get smmu_pclk\n"); + return PTR_ERR(iommu->pclk); + } + + ret = clk_prepare(iommu->pclk); + if (ret) { + dev_err(iommu->dev, "could not prepare smmu_pclk\n"); + return ret; + } + + iommu->clk = devm_clk_get(iommu->dev, "iommu_clk"); + if (IS_ERR(iommu->clk)) { + dev_err(iommu->dev, "could not get iommu_clk\n"); + clk_unprepare(iommu->pclk); + return PTR_ERR(iommu->clk); + } + + ret = clk_prepare(iommu->clk); + if (ret) { + dev_err(iommu->dev, "could not prepare iommu_clk\n"); + clk_unprepare(iommu->pclk); + return ret; + } + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + iommu->base = devm_ioremap_resource(iommu->dev, r); + if (IS_ERR(iommu->base)) { + dev_err(iommu->dev, "could not get iommu base\n"); + ret = PTR_ERR(iommu->base); + goto fail; + } + + iommu->irq = platform_get_irq(pdev, 0); + if (iommu->irq < 0) { + dev_err(iommu->dev, "could not get iommu irq\n"); + ret = -ENODEV; + goto fail; + } + + ret = of_property_read_u32(iommu->dev->of_node, "qcom,ncb", &val); + if (ret) { + dev_err(iommu->dev, "could not get ncb\n"); + goto fail; + } + iommu->ncb = val; + + msm_iommu_reset(iommu->base, iommu->ncb); + SET_M(iommu->base, 0, 1); + SET_PAR(iommu->base, 0, 0); + SET_V2PCFG(iommu->base, 0, 1); + SET_V2PPR(iommu->base, 0, 0); + par = GET_PAR(iommu->base, 0); + SET_V2PCFG(iommu->base, 0, 0); + SET_M(iommu->base, 0, 0); + + if (!par) { + pr_err("Invalid PAR value detected\n"); + ret = -ENODEV; + goto fail; + } + + ret = devm_request_threaded_irq(iommu->dev, iommu->irq, NULL, + msm_iommu_fault_handler, + IRQF_ONESHOT | IRQF_SHARED, + "msm_iommu_secure_irpt_handler", + iommu); + if (ret) { + pr_err("Request IRQ %d failed with ret=%d\n", iommu->irq, ret); + goto fail; + } + + list_add(&iommu->dev_node, &qcom_iommu_devices); + + pr_info("device mapped at %p, irq %d with %d ctx banks\n", + iommu->base, iommu->irq, iommu->ncb); + + return ret; +fail: + clk_unprepare(iommu->clk); + clk_unprepare(iommu->pclk); + return ret; +} + +static const struct of_device_id msm_iommu_dt_match[] = { + { .compatible = "qcom,apq8064-iommu" }, + {} +}; + +static int msm_iommu_remove(struct platform_device *pdev) +{ + struct msm_iommu_dev *iommu = platform_get_drvdata(pdev); + + clk_unprepare(iommu->clk); + clk_unprepare(iommu->pclk); + return 0; +} + +static struct platform_driver msm_iommu_driver = { + .driver = { + .name = "msm_iommu", + .of_match_table = msm_iommu_dt_match, + }, + .probe = msm_iommu_probe, + .remove = msm_iommu_remove, +}; + +static int __init msm_iommu_driver_init(void) +{ + int ret; + + ret = platform_driver_register(&msm_iommu_driver); + if (ret != 0) + pr_err("Failed to register IOMMU driver\n"); + + return ret; +} + +static void __exit msm_iommu_driver_exit(void) +{ + platform_driver_unregister(&msm_iommu_driver); +} + +subsys_initcall(msm_iommu_driver_init); +module_exit(msm_iommu_driver_exit); + static int __init get_tex_class(int icp, int ocp, int mt, int nos) { int i = 0; |