drivers/crypto/caam/ctrl.c - linux - Git at Google

 /*
  * CAAM control-plane driver backend
  * Controller-level driver, kernel property detection, initialization
  *
  * Copyright 2008-2012 Freescale Semiconductor, Inc.
  */

 #include "compat.h"
 #include "regs.h"
 #include "intern.h"
 #include "jr.h"
 #include "desc_constr.h"
 #include "error.h"
 #include "ctrl.h"

 static int caam_remove(struct platform_device *pdev)
 {
 	struct device *ctrldev;
 	struct caam_drv_private *ctrlpriv;
 	struct caam_drv_private_jr *jrpriv;
 	struct caam_full __iomem *topregs;
 	int ring, ret = 0;

 	ctrldev = &pdev->dev;
 	ctrlpriv = dev_get_drvdata(ctrldev);
 	topregs = (struct caam_full __iomem *)ctrlpriv->ctrl;

 	/* shut down JobRs */
 	for (ring = 0; ring < ctrlpriv->total_jobrs; ring++) {
 		ret |= caam_jr_shutdown(ctrlpriv->jrdev[ring]);
 		jrpriv = dev_get_drvdata(ctrlpriv->jrdev[ring]);
 		irq_dispose_mapping(jrpriv->irq);
 	}

 	/* Shut down debug views */
 #ifdef CONFIG_DEBUG_FS
 	debugfs_remove_recursive(ctrlpriv->dfs_root);
 #endif

 	/* Unmap controller region */
 	iounmap(&topregs->ctrl);

 	kfree(ctrlpriv->jrdev);
 	kfree(ctrlpriv);

 	return ret;
 }

 /*
  * Descriptor to instantiate RNG State Handle 0 in normal mode and
  * load the JDKEK, TDKEK and TDSK registers
  */
 static void build_instantiation_desc(u32 *desc)
 {
 	u32 *jump_cmd;

 	init_job_desc(desc, 0);

 	/* INIT RNG in non-test mode */
 	append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
 			 OP_ALG_AS_INIT);

 	/* wait for done */
 	jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
 	set_jump_tgt_here(desc, jump_cmd);

 	/*
 	 * load 1 to clear written reg:
 	 * resets the done interrupt and returns the RNG to idle.
 	 */
 	append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW);

 	/* generate secure keys (non-test) */
 	append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
 			 OP_ALG_RNG4_SK);
 }

 struct instantiate_result {
 	struct completion completion;
 	int err;
 };

 static void rng4_init_done(struct device *dev, u32 *desc, u32 err,
 			   void *context)
 {
 	struct instantiate_result *instantiation = context;

 	if (err) {
 		char tmp[CAAM_ERROR_STR_MAX];

 		dev_err(dev, "%08x: %s\n", err, caam_jr_strstatus(tmp, err));
 	}

 	instantiation->err = err;
 	complete(&instantiation->completion);
 }

 static int instantiate_rng(struct device *jrdev)
 {
 	struct instantiate_result instantiation;

 	dma_addr_t desc_dma;
 	u32 *desc;
 	int ret;

 	desc = kmalloc(CAAM_CMD_SZ * 6, GFP_KERNEL | GFP_DMA);
 	if (!desc) {
 		dev_err(jrdev, "cannot allocate RNG init descriptor memory\n");
 		return -ENOMEM;
 	}

 	build_instantiation_desc(desc);
 	desc_dma = dma_map_single(jrdev, desc, desc_bytes(desc), DMA_TO_DEVICE);
 	init_completion(&instantiation.completion);
 	ret = caam_jr_enqueue(jrdev, desc, rng4_init_done, &instantiation);
 	if (!ret) {
 		wait_for_completion_interruptible(&instantiation.completion);
 		ret = instantiation.err;
 		if (ret)
 			dev_err(jrdev, "unable to instantiate RNG\n");
 	}

 	dma_unmap_single(jrdev, desc_dma, desc_bytes(desc), DMA_TO_DEVICE);

 	kfree(desc);

 	return ret;
 }

 /*
  * By default, the TRNG runs for 200 clocks per sample;
  * 1600 clocks per sample generates better entropy.
  */
 static void kick_trng(struct platform_device *pdev)
 {
 	struct device *ctrldev = &pdev->dev;
 	struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
 	struct caam_full __iomem *topregs;
 	struct rng4tst __iomem *r4tst;
 	u32 val;

 	topregs = (struct caam_full __iomem *)ctrlpriv->ctrl;
 	r4tst = &topregs->ctrl.r4tst[0];

 	/* put RNG4 into program mode */
 	setbits32(&r4tst->rtmctl, RTMCTL_PRGM);
 	/* 1600 clocks per sample */
 	val = rd_reg32(&r4tst->rtsdctl);
 	val = (val & ~RTSDCTL_ENT_DLY_MASK) | (1600 << RTSDCTL_ENT_DLY_SHIFT);
 	wr_reg32(&r4tst->rtsdctl, val);
 	/* min. freq. count */
 	wr_reg32(&r4tst->rtfrqmin, 400);
 	/* max. freq. count */
 	wr_reg32(&r4tst->rtfrqmax, 6400);
 	/* put RNG4 into run mode */
 	clrbits32(&r4tst->rtmctl, RTMCTL_PRGM);
 }

 /**
  * caam_get_era() - Return the ERA of the SEC on SoC, based
  * on the SEC_VID register.
  * Returns the ERA number (1..4) or -ENOTSUPP if the ERA is unknown.
  * @caam_id - the value of the SEC_VID register
  **/
 int caam_get_era(u64 caam_id)
 {
 	struct sec_vid *sec_vid = (struct sec_vid *)&caam_id;
 	static const struct {
 		u16 ip_id;
 		u8 maj_rev;
 		u8 era;
 	} caam_eras[] = {
 		{0x0A10, 1, 1},
 		{0x0A10, 2, 2},
 		{0x0A12, 1, 3},
 		{0x0A14, 1, 3},
 		{0x0A14, 2, 4},
 		{0x0A16, 1, 4},
 		{0x0A11, 1, 4}
 	};
 	int i;

 	for (i = 0; i < ARRAY_SIZE(caam_eras); i++)
 		if (caam_eras[i].ip_id == sec_vid->ip_id &&
 			caam_eras[i].maj_rev == sec_vid->maj_rev)
 				return caam_eras[i].era;

 	return -ENOTSUPP;
 }
 EXPORT_SYMBOL(caam_get_era);

 /* Probe routine for CAAM top (controller) level */
 static int caam_probe(struct platform_device *pdev)
 {
 	int ret, ring, rspec;
 	u64 caam_id;
 	struct device *dev;
 	struct device_node *nprop, *np;
 	struct caam_ctrl __iomem *ctrl;
 	struct caam_full __iomem *topregs;
 	struct caam_drv_private *ctrlpriv;
 #ifdef CONFIG_DEBUG_FS
 	struct caam_perfmon *perfmon;
 #endif
 	u64 cha_vid;

 	ctrlpriv = kzalloc(sizeof(struct caam_drv_private), GFP_KERNEL);
 	if (!ctrlpriv)
 		return -ENOMEM;

 	dev = &pdev->dev;
 	dev_set_drvdata(dev, ctrlpriv);
 	ctrlpriv->pdev = pdev;
 	nprop = pdev->dev.of_node;

 	/* Get configuration properties from device tree */
 	/* First, get register page */
 	ctrl = of_iomap(nprop, 0);
 	if (ctrl == NULL) {
 		dev_err(dev, "caam: of_iomap() failed\n");
 		return -ENOMEM;
 	}
 	ctrlpriv->ctrl = (struct caam_ctrl __force *)ctrl;

 	/* topregs used to derive pointers to CAAM sub-blocks only */
 	topregs = (struct caam_full __iomem *)ctrl;

 	/* Get the IRQ of the controller (for security violations only) */
 	ctrlpriv->secvio_irq = of_irq_to_resource(nprop, 0, NULL);

 	/*
 	 * Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel,
 	 * long pointers in master configuration register
 	 */
 	setbits32(&topregs->ctrl.mcr, MCFGR_WDENABLE |
 		  (sizeof(dma_addr_t) == sizeof(u64) ? MCFGR_LONG_PTR : 0));

 	if (sizeof(dma_addr_t) == sizeof(u64))
 		if (of_device_is_compatible(nprop, "fsl,sec-v5.0"))
 			dma_set_mask(dev, DMA_BIT_MASK(40));
 		else
 			dma_set_mask(dev, DMA_BIT_MASK(36));
 	else
 		dma_set_mask(dev, DMA_BIT_MASK(32));

 	/*
 	 * Detect and enable JobRs
 	 * First, find out how many ring spec'ed, allocate references
 	 * for all, then go probe each one.
 	 */
 	rspec = 0;
 	for_each_compatible_node(np, NULL, "fsl,sec-v4.0-job-ring")
 		rspec++;
 	if (!rspec) {
 		/* for backward compatible with device trees */
 		for_each_compatible_node(np, NULL, "fsl,sec4.0-job-ring")
 			rspec++;
 	}

 	ctrlpriv->jrdev = kzalloc(sizeof(struct device *) * rspec, GFP_KERNEL);
 	if (ctrlpriv->jrdev == NULL) {
 		iounmap(&topregs->ctrl);
 		return -ENOMEM;
 	}

 	ring = 0;
 	ctrlpriv->total_jobrs = 0;
 	for_each_compatible_node(np, NULL, "fsl,sec-v4.0-job-ring") {
 		caam_jr_probe(pdev, np, ring);
 		ctrlpriv->total_jobrs++;
 		ring++;
 	}
 	if (!ring) {
 		for_each_compatible_node(np, NULL, "fsl,sec4.0-job-ring") {
 			caam_jr_probe(pdev, np, ring);
 			ctrlpriv->total_jobrs++;
 			ring++;
 		}
 	}

 	/* Check to see if QI present. If so, enable */
 	ctrlpriv->qi_present = !!(rd_reg64(&topregs->ctrl.perfmon.comp_parms) &
 				  CTPR_QI_MASK);
 	if (ctrlpriv->qi_present) {
 		ctrlpriv->qi = (struct caam_queue_if __force *)&topregs->qi;
 		/* This is all that's required to physically enable QI */
 		wr_reg32(&topregs->qi.qi_control_lo, QICTL_DQEN);
 	}

 	/* If no QI and no rings specified, quit and go home */
 	if ((!ctrlpriv->qi_present) && (!ctrlpriv->total_jobrs)) {
 		dev_err(dev, "no queues configured, terminating\n");
 		caam_remove(pdev);
 		return -ENOMEM;
 	}

 	cha_vid = rd_reg64(&topregs->ctrl.perfmon.cha_id);

 	/*
 	 * If SEC has RNG version >= 4 and RNG state handle has not been
 	 * already instantiated ,do RNG instantiation
 	 */
 	if ((cha_vid & CHA_ID_RNG_MASK) >> CHA_ID_RNG_SHIFT >= 4 &&
 	    !(rd_reg32(&topregs->ctrl.r4tst[0].rdsta) & RDSTA_IF0)) {
 		kick_trng(pdev);
 		ret = instantiate_rng(ctrlpriv->jrdev[0]);
 		if (ret) {
 			caam_remove(pdev);
 			return ret;
 		}

 		/* Enable RDB bit so that RNG works faster */
 		setbits32(&topregs->ctrl.scfgr, SCFGR_RDBENABLE);
 	}

 	/* NOTE: RTIC detection ought to go here, around Si time */

 	/* Initialize queue allocator lock */
 	spin_lock_init(&ctrlpriv->jr_alloc_lock);

 	caam_id = rd_reg64(&topregs->ctrl.perfmon.caam_id);

 	/* Report "alive" for developer to see */
 	dev_info(dev, "device ID = 0x%016llx (Era %d)\n", caam_id,
 		 caam_get_era(caam_id));
 	dev_info(dev, "job rings = %d, qi = %d\n",
 		 ctrlpriv->total_jobrs, ctrlpriv->qi_present);

 #ifdef CONFIG_DEBUG_FS
 	/*
 	 * FIXME: needs better naming distinction, as some amalgamation of
 	 * "caam" and nprop->full_name. The OF name isn't distinctive,
 	 * but does separate instances
 	 */
 	perfmon = (struct caam_perfmon __force *)&ctrl->perfmon;

 	ctrlpriv->dfs_root = debugfs_create_dir("caam", NULL);
 	ctrlpriv->ctl = debugfs_create_dir("ctl", ctrlpriv->dfs_root);

 	/* Controller-level - performance monitor counters */
 	ctrlpriv->ctl_rq_dequeued =
 		debugfs_create_u64("rq_dequeued",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->req_dequeued);
 	ctrlpriv->ctl_ob_enc_req =
 		debugfs_create_u64("ob_rq_encrypted",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->ob_enc_req);
 	ctrlpriv->ctl_ib_dec_req =
 		debugfs_create_u64("ib_rq_decrypted",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->ib_dec_req);
 	ctrlpriv->ctl_ob_enc_bytes =
 		debugfs_create_u64("ob_bytes_encrypted",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->ob_enc_bytes);
 	ctrlpriv->ctl_ob_prot_bytes =
 		debugfs_create_u64("ob_bytes_protected",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->ob_prot_bytes);
 	ctrlpriv->ctl_ib_dec_bytes =
 		debugfs_create_u64("ib_bytes_decrypted",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->ib_dec_bytes);
 	ctrlpriv->ctl_ib_valid_bytes =
 		debugfs_create_u64("ib_bytes_validated",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->ib_valid_bytes);

 	/* Controller level - global status values */
 	ctrlpriv->ctl_faultaddr =
 		debugfs_create_u64("fault_addr",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->faultaddr);
 	ctrlpriv->ctl_faultdetail =
 		debugfs_create_u32("fault_detail",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->faultdetail);
 	ctrlpriv->ctl_faultstatus =
 		debugfs_create_u32("fault_status",
 				   S_IRUSR | S_IRGRP | S_IROTH,
 				   ctrlpriv->ctl, &perfmon->status);

 	/* Internal covering keys (useful in non-secure mode only) */
 	ctrlpriv->ctl_kek_wrap.data = &ctrlpriv->ctrl->kek[0];
 	ctrlpriv->ctl_kek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 	ctrlpriv->ctl_kek = debugfs_create_blob("kek",
 						S_IRUSR |
 						S_IRGRP | S_IROTH,
 						ctrlpriv->ctl,
 						&ctrlpriv->ctl_kek_wrap);

 	ctrlpriv->ctl_tkek_wrap.data = &ctrlpriv->ctrl->tkek[0];
 	ctrlpriv->ctl_tkek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 	ctrlpriv->ctl_tkek = debugfs_create_blob("tkek",
 						 S_IRUSR |
 						 S_IRGRP | S_IROTH,
 						 ctrlpriv->ctl,
 						 &ctrlpriv->ctl_tkek_wrap);

 	ctrlpriv->ctl_tdsk_wrap.data = &ctrlpriv->ctrl->tdsk[0];
 	ctrlpriv->ctl_tdsk_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 	ctrlpriv->ctl_tdsk = debugfs_create_blob("tdsk",
 						 S_IRUSR |
 						 S_IRGRP | S_IROTH,
 						 ctrlpriv->ctl,
 						 &ctrlpriv->ctl_tdsk_wrap);
 #endif
 	return 0;
 }

 static struct of_device_id caam_match[] = {
 	{
 		.compatible = "fsl,sec-v4.0",
 	},
 	{
 		.compatible = "fsl,sec4.0",
 	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, caam_match);

 static struct platform_driver caam_driver = {
 	.driver = {
 		.name = "caam",
 		.owner = THIS_MODULE,
 		.of_match_table = caam_match,
 	},
 	.probe       = caam_probe,
 	.remove      = caam_remove,
 };

 module_platform_driver(caam_driver);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("FSL CAAM request backend");
 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");
	/*
	* CAAM control-plane driver backend
	* Controller-level driver, kernel property detection, initialization
	*
	* Copyright 2008-2012 Freescale Semiconductor, Inc.
	*/

	#include "compat.h"
	#include "regs.h"
	#include "intern.h"
	#include "jr.h"
	#include "desc_constr.h"
	#include "error.h"
	#include "ctrl.h"

	static int caam_remove(struct platform_device *pdev)
	{
	struct device *ctrldev;
	struct caam_drv_private *ctrlpriv;
	struct caam_drv_private_jr *jrpriv;
	struct caam_full __iomem *topregs;
	int ring, ret = 0;

	ctrldev = &pdev->dev;
	ctrlpriv = dev_get_drvdata(ctrldev);
	topregs = (struct caam_full __iomem *)ctrlpriv->ctrl;

	/* shut down JobRs */
	for (ring = 0; ring < ctrlpriv->total_jobrs; ring++) {
	ret \|= caam_jr_shutdown(ctrlpriv->jrdev[ring]);
	jrpriv = dev_get_drvdata(ctrlpriv->jrdev[ring]);
	irq_dispose_mapping(jrpriv->irq);
	}

	/* Shut down debug views */
	#ifdef CONFIG_DEBUG_FS
	debugfs_remove_recursive(ctrlpriv->dfs_root);
	#endif

	/* Unmap controller region */
	iounmap(&topregs->ctrl);

	kfree(ctrlpriv->jrdev);
	kfree(ctrlpriv);

	return ret;
	}

	/*
	* Descriptor to instantiate RNG State Handle 0 in normal mode and
	* load the JDKEK, TDKEK and TDSK registers
	*/
	static void build_instantiation_desc(u32 *desc)
	{
	u32 *jump_cmd;

	init_job_desc(desc, 0);

	/* INIT RNG in non-test mode */
	append_operation(desc, OP_TYPE_CLASS1_ALG \| OP_ALG_ALGSEL_RNG \|
	OP_ALG_AS_INIT);

	/* wait for done */
	jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
	set_jump_tgt_here(desc, jump_cmd);

	/*
	* load 1 to clear written reg:
	* resets the done interrupt and returns the RNG to idle.
	*/
	append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW);

	/* generate secure keys (non-test) */
	append_operation(desc, OP_TYPE_CLASS1_ALG \| OP_ALG_ALGSEL_RNG \|
	OP_ALG_RNG4_SK);
	}

	struct instantiate_result {
	struct completion completion;
	int err;
	};

	static void rng4_init_done(struct device dev, u32 desc, u32 err,
	void *context)
	{
	struct instantiate_result *instantiation = context;

	if (err) {
	char tmp[CAAM_ERROR_STR_MAX];

	dev_err(dev, "%08x: %s\n", err, caam_jr_strstatus(tmp, err));
	}

	instantiation->err = err;
	complete(&instantiation->completion);
	}

	static int instantiate_rng(struct device *jrdev)
	{
	struct instantiate_result instantiation;

	dma_addr_t desc_dma;
	u32 *desc;
	int ret;

	desc = kmalloc(CAAM_CMD_SZ * 6, GFP_KERNEL \| GFP_DMA);
	if (!desc) {
	dev_err(jrdev, "cannot allocate RNG init descriptor memory\n");
	return -ENOMEM;
	}

	build_instantiation_desc(desc);
	desc_dma = dma_map_single(jrdev, desc, desc_bytes(desc), DMA_TO_DEVICE);
	init_completion(&instantiation.completion);
	ret = caam_jr_enqueue(jrdev, desc, rng4_init_done, &instantiation);
	if (!ret) {
	wait_for_completion_interruptible(&instantiation.completion);
	ret = instantiation.err;
	if (ret)
	dev_err(jrdev, "unable to instantiate RNG\n");
	}

	dma_unmap_single(jrdev, desc_dma, desc_bytes(desc), DMA_TO_DEVICE);

	kfree(desc);

	return ret;
	}

	/*
	* By default, the TRNG runs for 200 clocks per sample;
	* 1600 clocks per sample generates better entropy.
	*/
	static void kick_trng(struct platform_device *pdev)
	{
	struct device *ctrldev = &pdev->dev;
	struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
	struct caam_full __iomem *topregs;
	struct rng4tst __iomem *r4tst;
	u32 val;

	topregs = (struct caam_full __iomem *)ctrlpriv->ctrl;
	r4tst = &topregs->ctrl.r4tst[0];

	/* put RNG4 into program mode */
	setbits32(&r4tst->rtmctl, RTMCTL_PRGM);
	/* 1600 clocks per sample */
	val = rd_reg32(&r4tst->rtsdctl);
	val = (val & ~RTSDCTL_ENT_DLY_MASK) \| (1600 << RTSDCTL_ENT_DLY_SHIFT);
	wr_reg32(&r4tst->rtsdctl, val);
	/* min. freq. count */
	wr_reg32(&r4tst->rtfrqmin, 400);
	/* max. freq. count */
	wr_reg32(&r4tst->rtfrqmax, 6400);
	/* put RNG4 into run mode */
	clrbits32(&r4tst->rtmctl, RTMCTL_PRGM);
	}

	/**
	* caam_get_era() - Return the ERA of the SEC on SoC, based
	* on the SEC_VID register.
	* Returns the ERA number (1..4) or -ENOTSUPP if the ERA is unknown.
	* @caam_id - the value of the SEC_VID register
	**/
	int caam_get_era(u64 caam_id)
	{
	struct sec_vid sec_vid = (struct sec_vid )&caam_id;
	static const struct {
	u16 ip_id;
	u8 maj_rev;
	u8 era;
	} caam_eras[] = {
	{0x0A10, 1, 1},
	{0x0A10, 2, 2},
	{0x0A12, 1, 3},
	{0x0A14, 1, 3},
	{0x0A14, 2, 4},
	{0x0A16, 1, 4},
	{0x0A11, 1, 4}
	};
	int i;

	for (i = 0; i < ARRAY_SIZE(caam_eras); i++)
	if (caam_eras[i].ip_id == sec_vid->ip_id &&
	caam_eras[i].maj_rev == sec_vid->maj_rev)
	return caam_eras[i].era;

	return -ENOTSUPP;
	}
	EXPORT_SYMBOL(caam_get_era);

	/* Probe routine for CAAM top (controller) level */
	static int caam_probe(struct platform_device *pdev)
	{
	int ret, ring, rspec;
	u64 caam_id;
	struct device *dev;
	struct device_node nprop, np;
	struct caam_ctrl __iomem *ctrl;
	struct caam_full __iomem *topregs;
	struct caam_drv_private *ctrlpriv;
	#ifdef CONFIG_DEBUG_FS
	struct caam_perfmon *perfmon;
	#endif
	u64 cha_vid;

	ctrlpriv = kzalloc(sizeof(struct caam_drv_private), GFP_KERNEL);
	if (!ctrlpriv)
	return -ENOMEM;

	dev = &pdev->dev;
	dev_set_drvdata(dev, ctrlpriv);
	ctrlpriv->pdev = pdev;
	nprop = pdev->dev.of_node;

	/* Get configuration properties from device tree */
	/* First, get register page */
	ctrl = of_iomap(nprop, 0);
	if (ctrl == NULL) {
	dev_err(dev, "caam: of_iomap() failed\n");
	return -ENOMEM;
	}
	ctrlpriv->ctrl = (struct caam_ctrl __force *)ctrl;

	/* topregs used to derive pointers to CAAM sub-blocks only */
	topregs = (struct caam_full __iomem *)ctrl;

	/* Get the IRQ of the controller (for security violations only) */
	ctrlpriv->secvio_irq = of_irq_to_resource(nprop, 0, NULL);

	/*
	* Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel,
	* long pointers in master configuration register
	*/
	setbits32(&topregs->ctrl.mcr, MCFGR_WDENABLE \|
	(sizeof(dma_addr_t) == sizeof(u64) ? MCFGR_LONG_PTR : 0));

	if (sizeof(dma_addr_t) == sizeof(u64))
	if (of_device_is_compatible(nprop, "fsl,sec-v5.0"))
	dma_set_mask(dev, DMA_BIT_MASK(40));
	else
	dma_set_mask(dev, DMA_BIT_MASK(36));
	else
	dma_set_mask(dev, DMA_BIT_MASK(32));

	/*
	* Detect and enable JobRs
	* First, find out how many ring spec'ed, allocate references
	* for all, then go probe each one.
	*/
	rspec = 0;
	for_each_compatible_node(np, NULL, "fsl,sec-v4.0-job-ring")
	rspec++;
	if (!rspec) {
	/* for backward compatible with device trees */
	for_each_compatible_node(np, NULL, "fsl,sec4.0-job-ring")
	rspec++;
	}

	ctrlpriv->jrdev = kzalloc(sizeof(struct device ) rspec, GFP_KERNEL);
	if (ctrlpriv->jrdev == NULL) {
	iounmap(&topregs->ctrl);
	return -ENOMEM;
	}

	ring = 0;
	ctrlpriv->total_jobrs = 0;
	for_each_compatible_node(np, NULL, "fsl,sec-v4.0-job-ring") {
	caam_jr_probe(pdev, np, ring);
	ctrlpriv->total_jobrs++;
	ring++;
	}
	if (!ring) {
	for_each_compatible_node(np, NULL, "fsl,sec4.0-job-ring") {
	caam_jr_probe(pdev, np, ring);
	ctrlpriv->total_jobrs++;
	ring++;
	}
	}

	/* Check to see if QI present. If so, enable */
	ctrlpriv->qi_present = !!(rd_reg64(&topregs->ctrl.perfmon.comp_parms) &
	CTPR_QI_MASK);
	if (ctrlpriv->qi_present) {
	ctrlpriv->qi = (struct caam_queue_if __force *)&topregs->qi;
	/* This is all that's required to physically enable QI */
	wr_reg32(&topregs->qi.qi_control_lo, QICTL_DQEN);
	}

	/* If no QI and no rings specified, quit and go home */
	if ((!ctrlpriv->qi_present) && (!ctrlpriv->total_jobrs)) {
	dev_err(dev, "no queues configured, terminating\n");
	caam_remove(pdev);
	return -ENOMEM;
	}

	cha_vid = rd_reg64(&topregs->ctrl.perfmon.cha_id);

	/*
	* If SEC has RNG version >= 4 and RNG state handle has not been
	* already instantiated ,do RNG instantiation
	*/
	if ((cha_vid & CHA_ID_RNG_MASK) >> CHA_ID_RNG_SHIFT >= 4 &&
	!(rd_reg32(&topregs->ctrl.r4tst[0].rdsta) & RDSTA_IF0)) {
	kick_trng(pdev);
	ret = instantiate_rng(ctrlpriv->jrdev[0]);
	if (ret) {
	caam_remove(pdev);
	return ret;
	}

	/* Enable RDB bit so that RNG works faster */
	setbits32(&topregs->ctrl.scfgr, SCFGR_RDBENABLE);
	}

	/* NOTE: RTIC detection ought to go here, around Si time */

	/* Initialize queue allocator lock */
	spin_lock_init(&ctrlpriv->jr_alloc_lock);

	caam_id = rd_reg64(&topregs->ctrl.perfmon.caam_id);

	/* Report "alive" for developer to see */
	dev_info(dev, "device ID = 0x%016llx (Era %d)\n", caam_id,
	caam_get_era(caam_id));
	dev_info(dev, "job rings = %d, qi = %d\n",
	ctrlpriv->total_jobrs, ctrlpriv->qi_present);

	#ifdef CONFIG_DEBUG_FS
	/*
	* FIXME: needs better naming distinction, as some amalgamation of
	* "caam" and nprop->full_name. The OF name isn't distinctive,
	* but does separate instances
	*/
	perfmon = (struct caam_perfmon __force *)&ctrl->perfmon;

	ctrlpriv->dfs_root = debugfs_create_dir("caam", NULL);
	ctrlpriv->ctl = debugfs_create_dir("ctl", ctrlpriv->dfs_root);

	/* Controller-level - performance monitor counters */
	ctrlpriv->ctl_rq_dequeued =
	debugfs_create_u64("rq_dequeued",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->req_dequeued);
	ctrlpriv->ctl_ob_enc_req =
	debugfs_create_u64("ob_rq_encrypted",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->ob_enc_req);
	ctrlpriv->ctl_ib_dec_req =
	debugfs_create_u64("ib_rq_decrypted",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->ib_dec_req);
	ctrlpriv->ctl_ob_enc_bytes =
	debugfs_create_u64("ob_bytes_encrypted",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->ob_enc_bytes);
	ctrlpriv->ctl_ob_prot_bytes =
	debugfs_create_u64("ob_bytes_protected",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->ob_prot_bytes);
	ctrlpriv->ctl_ib_dec_bytes =
	debugfs_create_u64("ib_bytes_decrypted",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->ib_dec_bytes);
	ctrlpriv->ctl_ib_valid_bytes =
	debugfs_create_u64("ib_bytes_validated",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->ib_valid_bytes);

	/* Controller level - global status values */
	ctrlpriv->ctl_faultaddr =
	debugfs_create_u64("fault_addr",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->faultaddr);
	ctrlpriv->ctl_faultdetail =
	debugfs_create_u32("fault_detail",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->faultdetail);
	ctrlpriv->ctl_faultstatus =
	debugfs_create_u32("fault_status",
	S_IRUSR \| S_IRGRP \| S_IROTH,
	ctrlpriv->ctl, &perfmon->status);

	/* Internal covering keys (useful in non-secure mode only) */
	ctrlpriv->ctl_kek_wrap.data = &ctrlpriv->ctrl->kek[0];
	ctrlpriv->ctl_kek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
	ctrlpriv->ctl_kek = debugfs_create_blob("kek",
	S_IRUSR \|
	S_IRGRP \| S_IROTH,
	ctrlpriv->ctl,
	&ctrlpriv->ctl_kek_wrap);

	ctrlpriv->ctl_tkek_wrap.data = &ctrlpriv->ctrl->tkek[0];
	ctrlpriv->ctl_tkek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
	ctrlpriv->ctl_tkek = debugfs_create_blob("tkek",
	S_IRUSR \|
	S_IRGRP \| S_IROTH,
	ctrlpriv->ctl,
	&ctrlpriv->ctl_tkek_wrap);

	ctrlpriv->ctl_tdsk_wrap.data = &ctrlpriv->ctrl->tdsk[0];
	ctrlpriv->ctl_tdsk_wrap.size = KEK_KEY_SIZE * sizeof(u32);
	ctrlpriv->ctl_tdsk = debugfs_create_blob("tdsk",
	S_IRUSR \|
	S_IRGRP \| S_IROTH,
	ctrlpriv->ctl,
	&ctrlpriv->ctl_tdsk_wrap);
	#endif
	return 0;
	}

	static struct of_device_id caam_match[] = {
	{
	.compatible = "fsl,sec-v4.0",
	},
	{
	.compatible = "fsl,sec4.0",
	},
	{},
	};
	MODULE_DEVICE_TABLE(of, caam_match);

	static struct platform_driver caam_driver = {
	.driver = {
	.name = "caam",
	.owner = THIS_MODULE,
	.of_match_table = caam_match,
	},
	.probe = caam_probe,
	.remove = caam_remove,
	};

	module_platform_driver(caam_driver);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("FSL CAAM request backend");
	MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");