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@xxxxxxxxxxxxx>
---
drivers/crypto/caam/compat.h | 1 +
drivers/crypto/caam/ctrl.c | 191 +++++++++++++++++++++++++++++++++++++++++++
drivers/crypto/caam/intern.h | 5 ++
3 files changed, 197 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 <linux/types.h>
#include <linux/debugfs.h>
#include <linux/circ_buf.h>
+#include <linux/clk.h>
#include <net/xfrm.h>
#include <crypto/algapi.h>
diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 660cc3e..cfd8c9e 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -16,6 +16,121 @@
#include "error.h"
/*
+ * ARM targets tend to have clock control subsystems that can
+ * enable/disable clocking to our device. Support clocking
+ * with the following functions.
+ */
+#ifdef CONFIG_ARM
+static inline struct clk *caam_drv_get_clk_ipg(struct caam_drv_private *drv)
+{
+ return drv->caam_ipg;
+}
+
+static inline struct clk *caam_drv_get_clk_mem(struct caam_drv_private *drv)
+{
+ return drv->caam_mem;
+}
+
+static inline struct clk *caam_drv_get_clk_aclk(struct caam_drv_private *drv)
+{
+ return drv->caam_aclk;
+}
+
+static inline struct clk *caam_drv_get_clk_emislow(struct caam_drv_private *drv)
+{
+ return drv->caam_emi_slow;
+}
+
+static inline void caam_drv_set_clk_ipg(struct caam_drv_private *drv,
+ struct clk *clk)
+{
+ drv->caam_ipg = clk;
+}
+
+static inline void caam_drv_set_clk_mem(struct caam_drv_private *drv,
+ struct clk *clk)
+{
+ drv->caam_mem = clk;
+}
+
+static inline void caam_drv_set_clk_aclk(struct caam_drv_private *drv,
+ struct clk *clk)
+{
+ drv->caam_aclk = clk;
+}
+
+static inline void caam_drv_set_clk_emislow(struct caam_drv_private *drv,
+ struct clk *clk)
+{
+ drv->caam_emi_slow = clk;
+}
+
+static inline struct clk *caam_drv_identify_clk(struct device *dev,
+ char *clk_name)
+{
+ return devm_clk_get(dev, clk_name);
+}
+
+static inline void caam_drv_show_clk(struct device *dev, struct clk *clk,
+ char *clk_name)
+{
+ dev_info(dev, "%s clock:%d\n", clk_name, (int)clk_get_rate(clk));
+}
+
+#else
+static inline struct clk *caam_drv_get_clk_ipg(struct caam_drv_private *drv)
+{
+ return NULL;
+}
+
+static inline struct clk *caam_drv_get_clk_mem(struct caam_drv_private *drv)
+{
+ return NULL;
+}
+
+static inline struct clk *caam_drv_get_clk_aclk(struct caam_drv_private *drv)
+{
+ return NULL;
+}
+
+static inline struct clk *caam_drv_get_clk_emislow(struct caam_drv_private *drv)
+{
+ return NULL;
+}
+
+static inline void caam_drv_set_clk_ipg(struct caam_drv_private *drv,
+ struct clk *clk)
+{
+}
+
+static inline void caam_drv_set_clk_mem(struct caam_drv_private *drv,
+ struct clk *clk)
+{
+}
+
+static inline void caam_drv_set_clk_aclk(struct caam_drv_private *drv,
+ struct clk *clk)
+{
+}
+
+static inline void caam_drv_set_clk_emislow(struct caam_drv_private *drv,
+ struct clk *clk)
+{
+}
+
+static inline struct clk *caam_drv_identify_clk(struct device *dev,
+ char *clk_name)
+{
+ return 0;
+}
+
+static inline void caam_drv_show_clk(struct device *dev, struct clk *clk,
+ char *clk_name)
+{
+}
+#endif
+
+/*
* Descriptor to instantiate RNG State Handle 0 in normal mode and
* load the JDKEK, TDKEK and TDSK registers
*/
@@ -304,6 +419,12 @@ static int caam_remove(struct platform_device *pdev)
/* Unmap controller region */
iounmap(ctrl);
+ /* shut clocks off before finalizing shutdown */
+ clk_disable_unprepare(caam_drv_get_clk_ipg(ctrlpriv));
+ clk_disable_unprepare(caam_drv_get_clk_mem(ctrlpriv));
+ clk_disable_unprepare(caam_drv_get_clk_aclk(ctrlpriv));
+ clk_disable_unprepare(caam_drv_get_clk_emislow(ctrlpriv));
+
return ret;
}
@@ -391,6 +512,7 @@ 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 +531,75 @@ 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, "caam_ipg");
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ dev_err(&pdev->dev,
+ "can't identify CAAM ipg clk: %d\n", ret);
+ return -ENODEV;
+ }
+ caam_drv_set_clk_ipg(ctrlpriv, clk);
+
+ clk = caam_drv_identify_clk(&pdev->dev, "caam_mem");
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ dev_err(&pdev->dev,
+ "can't identify CAAM mem clk: %d\n", ret);
+ return -ENODEV;
+ }
+ caam_drv_set_clk_mem(ctrlpriv, clk);
+
+ clk = caam_drv_identify_clk(&pdev->dev, "caam_aclk");
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ dev_err(&pdev->dev,
+ "can't identify CAAM aclk clk: %d\n", ret);
+ return -ENODEV;
+ }
+ caam_drv_set_clk_aclk(ctrlpriv, clk);
+
+ clk = caam_drv_identify_clk(&pdev->dev, "caam_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;
+ }
+ caam_drv_set_clk_emislow(ctrlpriv, clk);
+
+ ret = clk_prepare_enable(caam_drv_get_clk_ipg(ctrlpriv));
+ if (ret < 0) {
+ dev_err(&pdev->dev, "can't enable CAAM ipg clock: %d\n", ret);
+ return -ENODEV;
+ }
+
+ ret = clk_prepare_enable(caam_drv_get_clk_mem(ctrlpriv));
+ if (ret < 0) {
+ dev_err(&pdev->dev, "can't enable CAAM secure mem clock: %d\n",
+ ret);
+ return -ENODEV;
+ }
+
+ ret = clk_prepare_enable(caam_drv_get_clk_aclk(ctrlpriv));
+ if (ret < 0) {
+ dev_err(&pdev->dev, "can't enable CAAM aclk clock: %d\n", ret);
+ return -ENODEV;
+ }
+
+ ret = clk_prepare_enable(caam_drv_get_clk_emislow(ctrlpriv));
+ if (ret < 0) {
+ dev_err(&pdev->dev, "can't enable CAAM emi slow clock: %d\n",
+ ret);
+ return -ENODEV;
+ }
+
+ caam_drv_show_clk(dev, caam_drv_get_clk_ipg(ctrlpriv), "caam_ipg");
+ caam_drv_show_clk(dev, caam_drv_get_clk_mem(ctrlpriv), "caam_mem");
+ caam_drv_show_clk(dev, caam_drv_get_clk_aclk(ctrlpriv), "caam_aclk");
+ caam_drv_show_clk(dev, caam_drv_get_clk_emislow(ctrlpriv),
+ "caam_emi_slow");
+
/* 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.
--
2.1.4
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