diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-msm/include/mach/iommu.h | 9 | ||||
| -rw-r--r-- | arch/arm/mach-msm/iommu.c | 58 |
2 files changed, 62 insertions, 5 deletions
diff --git a/arch/arm/mach-msm/include/mach/iommu.h b/arch/arm/mach-msm/include/mach/iommu.h index 296c0f10f230..8738a4455588 100644 --- a/arch/arm/mach-msm/include/mach/iommu.h +++ b/arch/arm/mach-msm/include/mach/iommu.h @@ -1,4 +1,4 @@ -/* Copyright (c) 2010, Code Aurora Forum. All rights reserved. +/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -19,6 +19,7 @@ #define MSM_IOMMU_H #include <linux/interrupt.h> +#include <linux/clk.h> /* Sharability attributes of MSM IOMMU mappings */ #define MSM_IOMMU_ATTR_NON_SH 0x0 @@ -74,13 +75,17 @@ struct msm_iommu_ctx_dev { * struct msm_iommu_drvdata - A single IOMMU hardware instance * @base: IOMMU config port base address (VA) * @irq: Interrupt number - * + * @clk: The bus clock for this IOMMU hardware instance + * @pclk: The clock for the IOMMU bus interconnect + * * A msm_iommu_drvdata holds the global driver data about a single piece * of an IOMMU hardware instance. */ struct msm_iommu_drvdata { void __iomem *base; int irq; + struct clk *clk; + struct clk *pclk; }; /** diff --git a/arch/arm/mach-msm/iommu.c b/arch/arm/mach-msm/iommu.c index e2d58e4cb0d7..cde3cd0f8c0c 100644 --- a/arch/arm/mach-msm/iommu.c +++ b/arch/arm/mach-msm/iommu.c @@ -1,4 +1,4 @@ -/* Copyright (c) 2010, Code Aurora Forum. All rights reserved. +/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -26,6 +26,7 @@ #include <linux/spinlock.h> #include <linux/slab.h> #include <linux/iommu.h> +#include <linux/clk.h> #include <asm/cacheflush.h> #include <asm/sizes.h> @@ -50,6 +51,30 @@ struct msm_priv { struct list_head list_attached; }; +static int __enable_clocks(struct msm_iommu_drvdata *drvdata) +{ + int ret; + + ret = clk_enable(drvdata->pclk); + if (ret) + goto fail; + + if (drvdata->clk) { + ret = clk_enable(drvdata->clk); + if (ret) + clk_disable(drvdata->pclk); + } +fail: + return ret; +} + +static void __disable_clocks(struct msm_iommu_drvdata *drvdata) +{ + if (drvdata->clk) + clk_disable(drvdata->clk); + clk_disable(drvdata->pclk); +} + static int __flush_iotlb(struct iommu_domain *domain) { struct msm_priv *priv = domain->priv; @@ -77,9 +102,16 @@ static int __flush_iotlb(struct iommu_domain *domain) BUG(); iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent); + BUG_ON(!iommu_drvdata); + + ret = __enable_clocks(iommu_drvdata); + if (ret) + goto fail; + SET_CTX_TLBIALL(iommu_drvdata->base, ctx_drvdata->num, 0); + __disable_clocks(iommu_drvdata); } - +fail: return ret; } @@ -265,9 +297,14 @@ static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev) goto fail; } + ret = __enable_clocks(iommu_drvdata); + if (ret) + goto fail; + __program_context(iommu_drvdata->base, ctx_dev->num, __pa(priv->pgtable)); + __disable_clocks(iommu_drvdata); list_add(&(ctx_drvdata->attached_elm), &priv->list_attached); ret = __flush_iotlb(domain); @@ -303,7 +340,12 @@ static void msm_iommu_detach_dev(struct iommu_domain *domain, if (ret) goto fail; + ret = __enable_clocks(iommu_drvdata); + if (ret) + goto fail; + __reset_context(iommu_drvdata->base, ctx_dev->num); + __disable_clocks(iommu_drvdata); list_del_init(&ctx_drvdata->attached_elm); fail: @@ -532,6 +574,10 @@ static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain, base = iommu_drvdata->base; ctx = ctx_drvdata->num; + ret = __enable_clocks(iommu_drvdata); + if (ret) + goto fail; + /* Invalidate context TLB */ SET_CTX_TLBIALL(base, ctx, 0); SET_V2PPR_VA(base, ctx, va >> V2Pxx_VA_SHIFT); @@ -547,6 +593,7 @@ static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain, if (GET_FAULT(base, ctx)) ret = 0; + __disable_clocks(iommu_drvdata); fail: spin_unlock_irqrestore(&msm_iommu_lock, flags); return ret; @@ -590,7 +637,7 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id) struct msm_iommu_drvdata *drvdata = dev_id; void __iomem *base; unsigned int fsr; - int ncb, i; + int ncb, i, ret; spin_lock(&msm_iommu_lock); @@ -604,6 +651,10 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id) pr_err("Unexpected IOMMU page fault!\n"); pr_err("base = %08x\n", (unsigned int) base); + ret = __enable_clocks(drvdata); + if (ret) + goto fail; + ncb = GET_NCB(base)+1; for (i = 0; i < ncb; i++) { fsr = GET_FSR(base, i); @@ -614,6 +665,7 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id) SET_FSR(base, i, 0x4000000F); } } + __disable_clocks(drvdata); fail: spin_unlock(&msm_iommu_lock); return 0; |