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Commit 24821c46 authored by Victoria Milhoan's avatar Victoria Milhoan Committed by Herbert Xu
Browse files

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: default avatarVictoria Milhoan <vicki.milhoan@freescale.com>
Tested-by: default avatarHoria Geantă <horia.geanta@freescale.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 509da8fd

drivers/crypto/caam/compat.h

+1 −0
Original line number Diff line number Diff line
@@ -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>

drivers/crypto/caam/ctrl.c

+88 −0
Original line number Diff line number Diff line
@@ -15,6 +15,24 @@ 
#include "desc_constr.h"

#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);

drivers/crypto/caam/intern.h

+5 −0
Original line number Diff line number Diff line
@@ -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.