From 24821c4652dbf85a69e732574874dc191a813da4 Mon Sep 17 00:00:00 2001 From: Victoria Milhoan Date: Wed, 5 Aug 2015 11:28:37 -0700 Subject: [PATCH] crypto: caam - Enable and disable clocks on Freescale i.MX platforms MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit ARM-based systems may disable clocking to the CAAM device on the Freescale i.MX platform for power management purposes. This patch enables the required clocks when the CAAM module is initialized and disables the required clocks when the CAAM module is shut down. Signed-off-by: Victoria Milhoan Tested-by: Horia Geantă Signed-off-by: Herbert Xu --- drivers/crypto/caam/compat.h | 1 + drivers/crypto/caam/ctrl.c | 88 ++++++++++++++++++++++++++++++++++++++++++++ drivers/crypto/caam/intern.h | 5 +++ 3 files changed, 94 insertions(+) diff --git a/drivers/crypto/caam/compat.h b/drivers/crypto/caam/compat.h index f57f395..b6955ec 100644 --- a/drivers/crypto/caam/compat.h +++ b/drivers/crypto/caam/compat.h @@ -23,6 +23,7 @@ #include #include #include +#include #include #include diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c index 660cc3e..37c2d8d 100644 --- a/drivers/crypto/caam/ctrl.c +++ b/drivers/crypto/caam/ctrl.c @@ -16,6 +16,24 @@ #include "error.h" /* + * ARM targets tend to have clock control subsystems that can + * enable/disable clocking to our device. + */ +#ifdef CONFIG_ARM +static inline struct clk *caam_drv_identify_clk(struct device *dev, + char *clk_name) +{ + return devm_clk_get(dev, clk_name); +} +#else +static inline struct clk *caam_drv_identify_clk(struct device *dev, + char *clk_name) +{ + return NULL; +} +#endif + +/* * Descriptor to instantiate RNG State Handle 0 in normal mode and * load the JDKEK, TDKEK and TDSK registers */ @@ -304,6 +322,12 @@ static int caam_remove(struct platform_device *pdev) /* Unmap controller region */ iounmap(ctrl); + /* shut clocks off before finalizing shutdown */ + clk_disable_unprepare(ctrlpriv->caam_ipg); + clk_disable_unprepare(ctrlpriv->caam_mem); + clk_disable_unprepare(ctrlpriv->caam_aclk); + clk_disable_unprepare(ctrlpriv->caam_emi_slow); + return ret; } @@ -391,6 +415,7 @@ static int caam_probe(struct platform_device *pdev) struct device_node *nprop, *np; struct caam_ctrl __iomem *ctrl; struct caam_drv_private *ctrlpriv; + struct clk *clk; #ifdef CONFIG_DEBUG_FS struct caam_perfmon *perfmon; #endif @@ -409,6 +434,69 @@ static int caam_probe(struct platform_device *pdev) ctrlpriv->pdev = pdev; nprop = pdev->dev.of_node; + /* Enable clocking */ + clk = caam_drv_identify_clk(&pdev->dev, "ipg"); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + dev_err(&pdev->dev, + "can't identify CAAM ipg clk: %d\n", ret); + return -ENODEV; + } + ctrlpriv->caam_ipg = clk; + + clk = caam_drv_identify_clk(&pdev->dev, "mem"); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + dev_err(&pdev->dev, + "can't identify CAAM mem clk: %d\n", ret); + return -ENODEV; + } + ctrlpriv->caam_mem = clk; + + clk = caam_drv_identify_clk(&pdev->dev, "aclk"); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + dev_err(&pdev->dev, + "can't identify CAAM aclk clk: %d\n", ret); + return -ENODEV; + } + ctrlpriv->caam_aclk = clk; + + clk = caam_drv_identify_clk(&pdev->dev, "emi_slow"); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + dev_err(&pdev->dev, + "can't identify CAAM emi_slow clk: %d\n", ret); + return -ENODEV; + } + ctrlpriv->caam_emi_slow = clk; + + ret = clk_prepare_enable(ctrlpriv->caam_ipg); + if (ret < 0) { + dev_err(&pdev->dev, "can't enable CAAM ipg clock: %d\n", ret); + return -ENODEV; + } + + ret = clk_prepare_enable(ctrlpriv->caam_mem); + if (ret < 0) { + dev_err(&pdev->dev, "can't enable CAAM secure mem clock: %d\n", + ret); + return -ENODEV; + } + + ret = clk_prepare_enable(ctrlpriv->caam_aclk); + if (ret < 0) { + dev_err(&pdev->dev, "can't enable CAAM aclk clock: %d\n", ret); + return -ENODEV; + } + + ret = clk_prepare_enable(ctrlpriv->caam_emi_slow); + if (ret < 0) { + dev_err(&pdev->dev, "can't enable CAAM emi slow clock: %d\n", + ret); + return -ENODEV; + } + /* Get configuration properties from device tree */ /* First, get register page */ ctrl = of_iomap(nprop, 0); diff --git a/drivers/crypto/caam/intern.h b/drivers/crypto/caam/intern.h index 89b94cc..e2bcacc 100644 --- a/drivers/crypto/caam/intern.h +++ b/drivers/crypto/caam/intern.h @@ -91,6 +91,11 @@ struct caam_drv_private { Handles of the RNG4 block are initialized by this driver */ + struct clk *caam_ipg; + struct clk *caam_mem; + struct clk *caam_aclk; + struct clk *caam_emi_slow; + /* * debugfs entries for developer view into driver/device * variables at runtime. -- 2.7.4