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authorAndrew Lunn <andrew@lunn.ch>2012-02-19 11:56:19 +0100
committerMike Turquette <mturquette@linaro.org>2012-05-08 16:34:01 -0700
commit1f80b126d06cf5c88b7f03a80c79ffd85053688a (patch)
tree75a64420f66f16e72cf5b08466666f2f01fdd1f7 /drivers/crypto
parentf4f7561e032777cd7376800ac97352d5b1684d8f (diff)
downloadop-kernel-dev-1f80b126d06cf5c88b7f03a80c79ffd85053688a.zip
op-kernel-dev-1f80b126d06cf5c88b7f03a80c79ffd85053688a.tar.gz
ARM: Orion: CESA: Add support for clk
Some orion platforms support gating of the clock. If the clock exists enable/disbale it as appropriate. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Tested-by: Jamie Lentin <jm@lentin.co.uk> Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/mv_cesa.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/crypto/mv_cesa.c b/drivers/crypto/mv_cesa.c
index e6ecc5f..1cc6b3f 100644
--- a/drivers/crypto/mv_cesa.c
+++ b/drivers/crypto/mv_cesa.c
@@ -16,6 +16,7 @@
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/clk.h>
#include <crypto/internal/hash.h>
#include <crypto/sha.h>
@@ -79,6 +80,7 @@ struct crypto_priv {
void __iomem *reg;
void __iomem *sram;
int irq;
+ struct clk *clk;
struct task_struct *queue_th;
/* the lock protects queue and eng_st */
@@ -1053,6 +1055,12 @@ static int mv_probe(struct platform_device *pdev)
if (ret)
goto err_thread;
+ /* Not all platforms can gate the clock, so it is not
+ an error if the clock does not exists. */
+ cp->clk = clk_get(&pdev->dev, NULL);
+ if (!IS_ERR(cp->clk))
+ clk_prepare_enable(cp->clk);
+
writel(SEC_INT_ACCEL0_DONE, cpg->reg + SEC_ACCEL_INT_MASK);
writel(SEC_CFG_STOP_DIG_ERR, cpg->reg + SEC_ACCEL_CFG);
writel(SRAM_CONFIG, cpg->reg + SEC_ACCEL_DESC_P0);
@@ -1118,6 +1126,12 @@ static int mv_remove(struct platform_device *pdev)
memset(cp->sram, 0, cp->sram_size);
iounmap(cp->sram);
iounmap(cp->reg);
+
+ if (!IS_ERR(cp->clk)) {
+ clk_disable_unprepare(cp->clk);
+ clk_put(cp->clk);
+ }
+
kfree(cp);
cpg = NULL;
return 0;
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