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Fri, 14 Mar 2014 14:05:17 +0900 (KST) Received: from DO-PULLIP-CHO07.dsn.sec.samsung.com ([12.36.165.149]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0N2E003PFU4T85I2@mmp1.samsung.com>; Fri, 14 Mar 2014 14:05:17 +0900 (KST) Date: Fri, 14 Mar 2014 14:05:17 +0900 From: Cho KyongHo To: Linux ARM Kernel , Linux DeviceTree , Linux IOMMU , Linux Kernel , Linux Samsung SOC Subject: [PATCH v11 08/27] iommu/exynos: always use a single clock descriptor Message-id: <20140314140517.a7ac6c35b68177784d20b755@samsung.com> X-Mailer: Sylpheed 3.3.0 (GTK+ 2.10.14; i686-pc-mingw32) MIME-version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrPIsWRmVeSWpSXmKPExsVy+t8zfV3ePqVggzWHdCzu3D3HajH/CJB4 deQHk8WC/dYWnbM3sFv0LrjKZrHp8TVWi8u75rBZzDi/j8niwoqN7BZTFh1mtTj8pp3V4uSf XkaL9TNes1jMvLWGxYHf48nBeUwesxsusnj8O9zP5HHn2h42j81L6j0m31jO6NG3ZRWjx+dN ch5Xjp5hCuCM4rJJSc3JLEst0rdL4Mr4tSW/4EtQxdnm92wNjPsduxg5OSQETCQWfWxmh7DF JC7cW8/WxcjFISSwjFFi6YN/TF2MHGBFR2brgtQICSxilJi4wB7CnswkMfVDMIjNIqAq8WTZ ThYQm01AS2L13OOMIHNEBNqYJL42HmIBcZgF5jJLfPw2hw2kSljAV+LlgW2sIDavgKPE/R+T GSGusJC40NTBDhEXlPgx+R7YVGagqZu3NbFC2PISm9e8ZQYZKiHQySHx+etmVogzBCS+TQbZ BnK1rMSmA8wQMyUlDq64wTKBUWQWkrGzkIydhWTsAkbmVYyiqQXJBcVJ6UWmesWJucWleel6 yfm5mxghkTtxB+P9A9aHGJOBVk5klhJNzgdGfl5JvKGxmZGFqYmpsZG5pRlpwkrivOmPkoKE BNITS1KzU1MLUovii0pzUosPMTJxcEo1MBpPtr1ky3e+OOX/kTdT7vC/FYzQ8r5V0de4uMBt lk3LUi4Bmcf8qSEPdPffijd80sumPednqsErlq+91uUnvcIcHzNrSErV32FwiX3yVaMocvO2 GrOvrlGMr40uJy5KUUh0uZtz5cVKk+22JyakfbTdoOXkc/x0grll2M+lZ2YWlia779kXosRS nJFoqMVcVJwIABOXIvfyAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrDKsWRmVeSWpSXmKPExsVy+t9jAV3ePqVgg8Mb1Szu3D3HajH/CJB4 deQHk8WC/dYWnbM3sFv0LrjKZrHp8TVWi8u75rBZzDi/j8niwoqN7BZTFh1mtTj8pp3V4uSf XkaL9TNes1jMvLWGxYHf48nBeUwesxsusnj8O9zP5HHn2h42j81L6j0m31jO6NG3ZRWjx+dN ch5Xjp5hCuCMamC0yUhNTEktUkjNS85PycxLt1XyDo53jjc1MzDUNbS0MFdSyEvMTbVVcvEJ 0HXLzAH6QEmhLDGnFCgUkFhcrKRvh2lCaIibrgVMY4Sub0gQXI+RARpIWMeY8WtLfsGXoIqz ze/ZGhj3O3YxcnBICJhIHJmt28XICWSKSVy4t54NxBYSWMQoMXGBPYQ9mUli6odgEJtFQFXi ybKdLCA2m4CWxOq5xxm7GLk4RATamCS+Nh5iAXGYBeYyS3z8NgdskrCAr8TLA9tYQWxeAUeJ +z8mM0Jss5C40NTBDhEXlPgx+R7YVGagqZu3NbFC2PISm9e8ZZ7AyDcLSdksJGWzkJQtYGRe xSiaWpBcUJyUnmuoV5yYW1yal66XnJ+7iRGcFp5J7WBc2WBxiFGAg1GJh9fhsGKwEGtiWXFl 7iFGCQ5mJRHeqgilYCHelMTKqtSi/Pii0pzU4kOMyUB/T2SWEk3OB6asvJJ4Q2MTMyNLIzML IxNzc9KElcR5D7RaBwoJpCeWpGanphakFsFsYeLglGpgjF7sujy8rmSrmMBzNqac02++udgr s6u8UZvicHjjjK0bi8L79I4IXJX48u/k9+O2myL2yq3efyvucFd6/JZbL+RmXTnKrTjjtp3H bYesN0eabkfu+bjntGTTcrfO+x9v1DjOl/Kr6He2qbxdklkSHdpk2rf2a3JPtmrchaX3/oS/ 8Zt+uceDVYmlOCPRUIu5qDgRANtK2k1PAwAA DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140314_010541_322108_F434E554 X-CRM114-Status: GOOD ( 21.02 ) X-Spam-Score: -6.9 (------) Cc: Kukjin Kim , Prathyush , Grant Grundler , Joerg Roedel , Sachin Kamat , Sylwester Nawrocki , Varun Sethi , Antonios Motakis , Tomasz Figa , Rahul Sharma X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP System MMU driver is changed to control only a single instance of System MMU at a time. Since a single instance of System MMU has only a single clock descriptor for its clock gating, there is no need to obtain two or more clock descriptors. Signed-off-by: Cho KyongHo --- drivers/iommu/exynos-iommu.c | 223 ++++++++++++++---------------------------- 1 file changed, 72 insertions(+), 151 deletions(-) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 8dc7031..a4499b2 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -171,9 +171,8 @@ struct sysmmu_drvdata { struct device *sysmmu; /* System MMU's device descriptor */ struct device *dev; /* Owner of system MMU */ char *dbgname; - int nsfrs; - void __iomem **sfrbases; - struct clk *clk[2]; + void __iomem *sfrbase; + struct clk *clk; int activations; rwlock_t lock; struct iommu_domain *domain; @@ -294,56 +293,39 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) { /* SYSMMU is in blocked when interrupt occurred. */ struct sysmmu_drvdata *data = dev_id; - struct resource *irqres; - struct platform_device *pdev; enum exynos_sysmmu_inttype itype; unsigned long addr = -1; - - int i, ret = -ENOSYS; + int ret = -ENOSYS; read_lock(&data->lock); WARN_ON(!is_sysmmu_active(data)); - pdev = to_platform_device(data->sysmmu); - for (i = 0; i < (pdev->num_resources / 2); i++) { - irqres = platform_get_resource(pdev, IORESOURCE_IRQ, i); - if (irqres && ((int)irqres->start == irq)) - break; - } - - if (i == pdev->num_resources) { + itype = (enum exynos_sysmmu_inttype) + __ffs(__raw_readl(data->sfrbase + REG_INT_STATUS)); + if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN)))) itype = SYSMMU_FAULT_UNKNOWN; - } else { - itype = (enum exynos_sysmmu_inttype) - __ffs(__raw_readl(data->sfrbases[i] + REG_INT_STATUS)); - if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN)))) - itype = SYSMMU_FAULT_UNKNOWN; - else - addr = __raw_readl( - data->sfrbases[i] + fault_reg_offset[itype]); - } + else + addr = __raw_readl(data->sfrbase + fault_reg_offset[itype]); if (data->domain) - ret = report_iommu_fault(data->domain, data->dev, - addr, itype); + ret = report_iommu_fault(data->domain, data->dev, addr, itype); if ((ret == -ENOSYS) && data->fault_handler) { unsigned long base = data->pgtable; if (itype != SYSMMU_FAULT_UNKNOWN) - base = __raw_readl( - data->sfrbases[i] + REG_PT_BASE_ADDR); + base = __raw_readl(data->sfrbase + REG_PT_BASE_ADDR); ret = data->fault_handler(itype, base, addr); } if (!ret && (itype != SYSMMU_FAULT_UNKNOWN)) - __raw_writel(1 << itype, data->sfrbases[i] + REG_INT_CLEAR); + __raw_writel(1 << itype, data->sfrbase + REG_INT_CLEAR); else dev_dbg(data->sysmmu, "(%s) %s is not handled.\n", data->dbgname, sysmmu_fault_name[itype]); if (itype != SYSMMU_FAULT_UNKNOWN) - sysmmu_unblock(data->sfrbases[i]); + sysmmu_unblock(data->sfrbase); read_unlock(&data->lock); @@ -354,20 +336,16 @@ static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data) { unsigned long flags; bool disabled = false; - int i; write_lock_irqsave(&data->lock, flags); if (!set_sysmmu_inactive(data)) goto finish; - for (i = 0; i < data->nsfrs; i++) - __raw_writel(CTRL_DISABLE, data->sfrbases[i] + REG_MMU_CTRL); + __raw_writel(CTRL_DISABLE, data->sfrbase + REG_MMU_CTRL); - if (data->clk[1]) - clk_disable(data->clk[1]); - if (data->clk[0]) - clk_disable(data->clk[0]); + if (data->clk) + clk_disable(data->clk); disabled = true; data->pgtable = 0; @@ -393,7 +371,7 @@ finish: static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data, unsigned long pgtable, struct iommu_domain *domain) { - int i, ret = 0; + int ret = 0; unsigned long flags; write_lock_irqsave(&data->lock, flags); @@ -410,17 +388,14 @@ static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data, goto finish; } - if (data->clk[0]) - clk_enable(data->clk[0]); - if (data->clk[1]) - clk_enable(data->clk[1]); + if (data->clk) + clk_enable(data->clk); data->pgtable = pgtable; - for (i = 0; i < data->nsfrs; i++) { - __sysmmu_set_ptbase(data->sfrbases[i], pgtable); - __raw_writel(CTRL_ENABLE, data->sfrbases[i] + REG_MMU_CTRL); - } + __sysmmu_set_ptbase(data->sfrbase, pgtable); + + __raw_writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL); data->domain = domain; @@ -477,28 +452,26 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova, read_lock_irqsave(&data->lock, flags); if (is_sysmmu_active(data)) { - int i; - for (i = 0; i < data->nsfrs; i++) { - unsigned int maj; - unsigned int num_inv = 1; - maj = __raw_readl(data->sfrbases[i] + REG_MMU_VERSION); - /* - * L2TLB invalidation required - * 4KB page: 1 invalidation - * 64KB page: 16 invalidation - * 1MB page: 64 invalidation - * because it is set-associative TLB - * with 8-way and 64 sets. - * 1MB page can be cached in one of all sets. - * 64KB page can be one of 16 consecutive sets. - */ - if ((maj >> 28) == 2) /* major version number */ - num_inv = min_t(unsigned int, size / PAGE_SIZE, 64); - if (sysmmu_block(data->sfrbases[i])) { - __sysmmu_tlb_invalidate_entry( - data->sfrbases[i], iova, num_inv); - sysmmu_unblock(data->sfrbases[i]); - } + unsigned int maj; + unsigned int num_inv = 1; + maj = __raw_readl(data->sfrbase + REG_MMU_VERSION); + /* + * L2TLB invalidation required + * 4KB page: 1 invalidation + * 64KB page: 16 invalidation + * 1MB page: 64 invalidation + * because it is set-associative TLB + * with 8-way and 64 sets. + * 1MB page can be cached in one of all sets. + * 64KB page can be one of 16 consecutive sets. + */ + if ((maj >> 28) == 2) /* major version number */ + num_inv = min_t(unsigned int, size / PAGE_SIZE, 64); + + if (sysmmu_block(data->sfrbase)) { + __sysmmu_tlb_invalidate_entry(data->sfrbase, iova, + num_inv); + sysmmu_unblock(data->sfrbase); } } else { dev_dbg(data->sysmmu, @@ -517,12 +490,9 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev) read_lock_irqsave(&data->lock, flags); if (is_sysmmu_active(data)) { - int i; - for (i = 0; i < data->nsfrs; i++) { - if (sysmmu_block(data->sfrbases[i])) { - __sysmmu_tlb_invalidate(data->sfrbases[i]); - sysmmu_unblock(data->sfrbases[i]); - } + if (sysmmu_block(data->sfrbase)) { + __sysmmu_tlb_invalidate(data->sfrbase); + sysmmu_unblock(data->sfrbase); } } else { dev_dbg(data->sysmmu, @@ -535,11 +505,10 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev) static int exynos_sysmmu_probe(struct platform_device *pdev) { - int i, ret; - struct device *dev; + int ret; + struct device *dev = &pdev->dev; struct sysmmu_drvdata *data; - - dev = &pdev->dev; + struct resource *res; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) { @@ -548,82 +517,39 @@ static int exynos_sysmmu_probe(struct platform_device *pdev) goto err_alloc; } - ret = dev_set_drvdata(dev, data); - if (ret) { - dev_dbg(dev, "Unabled to initialize driver data\n"); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_dbg(dev, "Unable to find IOMEM region\n"); + ret = -ENOENT; goto err_init; } - data->nsfrs = pdev->num_resources / 2; - data->sfrbases = kmalloc(sizeof(*data->sfrbases) * data->nsfrs, - GFP_KERNEL); - if (data->sfrbases == NULL) { - dev_dbg(dev, "Not enough memory\n"); - ret = -ENOMEM; - goto err_init; + data->sfrbase = ioremap(res->start, resource_size(res)); + if (!data->sfrbase) { + dev_dbg(dev, "Unable to map IOMEM @ PA:%#x\n", res->start); + ret = -ENOENT; + goto err_res; } - for (i = 0; i < data->nsfrs; i++) { - struct resource *res; - res = platform_get_resource(pdev, IORESOURCE_MEM, i); - if (!res) { - dev_dbg(dev, "Unable to find IOMEM region\n"); - ret = -ENOENT; - goto err_res; - } - - data->sfrbases[i] = ioremap(res->start, resource_size(res)); - if (!data->sfrbases[i]) { - dev_dbg(dev, "Unable to map IOMEM @ PA:%#x\n", - res->start); - ret = -ENOENT; - goto err_res; - } + ret = platform_get_irq(pdev, 0); + if (ret <= 0) { + dev_dbg(dev, "Unable to find IRQ resource\n"); + goto err_irq; } - for (i = 0; i < data->nsfrs; i++) { - ret = platform_get_irq(pdev, i); - if (ret <= 0) { - dev_dbg(dev, "Unable to find IRQ resource\n"); - goto err_irq; - } - - ret = request_irq(ret, exynos_sysmmu_irq, 0, - dev_name(dev), data); - if (ret) { - dev_dbg(dev, "Unabled to register interrupt handler\n"); - goto err_irq; - } + ret = request_irq(ret, exynos_sysmmu_irq, 0, + dev_name(dev), data); + if (ret) { + dev_dbg(dev, "Unabled to register interrupt handler\n"); + goto err_irq; } if (dev_get_platdata(dev)) { - char *deli, *beg; - struct sysmmu_platform_data *platdata = dev_get_platdata(dev); - - beg = platdata->clockname; - - for (deli = beg; (*deli != '\0') && (*deli != ','); deli++) - /* NOTHING */; - - if (*deli == '\0') - deli = NULL; - else - *deli = '\0'; - - data->clk[0] = clk_get(dev, beg); - if (IS_ERR(data->clk[0])) { - data->clk[0] = NULL; + data->clk = clk_get(dev, "sysmmu"); + if (IS_ERR(data->clk)) { + data->clk = NULL; dev_dbg(dev, "No clock descriptor registered\n"); } - - if (data->clk[0] && deli) { - *deli = ','; - data->clk[1] = clk_get(dev, deli + 1); - if (IS_ERR(data->clk[1])) - data->clk[1] = NULL; - } - - data->dbgname = platdata->dbgname; } data->sysmmu = dev; @@ -632,21 +558,16 @@ static int exynos_sysmmu_probe(struct platform_device *pdev) __set_fault_handler(data, &default_fault_handler); + platform_set_drvdata(pdev, data); + pm_runtime_enable(dev); dev_dbg(dev, "(%s) Initialized\n", data->dbgname); return 0; err_irq: - while (i-- > 0) { - int irq; - - irq = platform_get_irq(pdev, i); - free_irq(irq, data); - } + free_irq(platform_get_irq(pdev, 0), data); err_res: - while (data->nsfrs-- > 0) - iounmap(data->sfrbases[data->nsfrs]); - kfree(data->sfrbases); + iounmap(data->sfrbase); err_init: kfree(data); err_alloc: