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authorVictoria Milhoan <vicki.milhoan@freescale.com>2015-08-05 21:28:37 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2015-08-10 18:18:56 +0300
commit24821c4652dbf85a69e732574874dc191a813da4 (patch)
treee7ccf92b737dfbfd3c49a7e014c72d6c13d7771a /drivers/crypto/caam/ctrl.c
parent509da8fda4f06d7914dbada7af121c9f00284173 (diff)
downloadlinux-24821c4652dbf85a69e732574874dc191a813da4.tar.xz
crypto: caam - Enable and disable clocks on Freescale i.MX platforms
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 <vicki.milhoan@freescale.com> Tested-by: Horia Geantă <horia.geanta@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/caam/ctrl.c')
-rw-r--r--drivers/crypto/caam/ctrl.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 660cc3edd4a7..37c2d8d965a6 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);