drivers/crypto/fsl/jr.c - platform/external/u-boot - Gitiles

 /*
  * Copyright 2008-2014 Freescale Semiconductor, Inc.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  *
  * Based on CAAM driver in drivers/crypto/caam in Linux
  */

 #include <common.h>
 #include <malloc.h>
 #include "fsl_sec.h"
 #include "jr.h"
 #include "jobdesc.h"

 #define CIRC_CNT(head, tail, size)	(((head) - (tail)) & (size - 1))
 #define CIRC_SPACE(head, tail, size)	CIRC_CNT((tail), (head) + 1, (size))

 struct jobring jr;

 static inline void start_jr0(void)
 {
 	ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
 	u32 ctpr_ms = sec_in32(&sec->ctpr_ms);
 	u32 scfgr = sec_in32(&sec->scfgr);

 	if (ctpr_ms & SEC_CTPR_MS_VIRT_EN_INCL) {
 		/* VIRT_EN_INCL = 1 & VIRT_EN_POR = 1 or
 		 * VIRT_EN_INCL = 1 & VIRT_EN_POR = 0 & SEC_SCFGR_VIRT_EN = 1
 		 */
 		if ((ctpr_ms & SEC_CTPR_MS_VIRT_EN_POR) ||
 		    (!(ctpr_ms & SEC_CTPR_MS_VIRT_EN_POR) &&
 					(scfgr & SEC_SCFGR_VIRT_EN)))
 			sec_out32(&sec->jrstartr, CONFIG_JRSTARTR_JR0);
 	} else {
 		/* VIRT_EN_INCL = 0 && VIRT_EN_POR_VALUE = 1 */
 		if (ctpr_ms & SEC_CTPR_MS_VIRT_EN_POR)
 			sec_out32(&sec->jrstartr, CONFIG_JRSTARTR_JR0);
 	}
 }

 static inline void jr_reset_liodn(void)
 {
 	ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
 	sec_out32(&sec->jrliodnr[0].ls, 0);
 }

 static inline void jr_disable_irq(void)
 {
 	struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
 	uint32_t jrcfg = sec_in32(&regs->jrcfg1);

 	jrcfg = jrcfg | JR_INTMASK;

 	sec_out32(&regs->jrcfg1, jrcfg);
 }

 static void jr_initregs(void)
 {
 	struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
 	phys_addr_t ip_base = virt_to_phys((void *)jr.input_ring);
 	phys_addr_t op_base = virt_to_phys((void *)jr.output_ring);

 #ifdef CONFIG_PHYS_64BIT
 	sec_out32(&regs->irba_h, ip_base >> 32);
 #else
 	sec_out32(&regs->irba_h, 0x0);
 #endif
 	sec_out32(&regs->irba_l, (uint32_t)ip_base);
 #ifdef CONFIG_PHYS_64BIT
 	sec_out32(&regs->orba_h, op_base >> 32);
 #else
 	sec_out32(&regs->orba_h, 0x0);
 #endif
 	sec_out32(&regs->orba_l, (uint32_t)op_base);
 	sec_out32(&regs->ors, JR_SIZE);
 	sec_out32(&regs->irs, JR_SIZE);

 	if (!jr.irq)
 		jr_disable_irq();
 }

 static int jr_init(void)
 {
 	memset(&jr, 0, sizeof(struct jobring));

 	jr.jq_id = DEFAULT_JR_ID;
 	jr.irq = DEFAULT_IRQ;

 #ifdef CONFIG_FSL_CORENET
 	jr.liodn = DEFAULT_JR_LIODN;
 #endif
 	jr.size = JR_SIZE;
 	jr.input_ring = (dma_addr_t *)memalign(ARCH_DMA_MINALIGN,
 				JR_SIZE * sizeof(dma_addr_t));
 	if (!jr.input_ring)
 		return -1;
 	jr.output_ring =
 	    (struct op_ring *)memalign(ARCH_DMA_MINALIGN,
 				JR_SIZE * sizeof(struct op_ring));
 	if (!jr.output_ring)
 		return -1;

 	memset(jr.input_ring, 0, JR_SIZE * sizeof(dma_addr_t));
 	memset(jr.output_ring, 0, JR_SIZE * sizeof(struct op_ring));

 	start_jr0();

 	jr_initregs();

 	return 0;
 }

 static int jr_sw_cleanup(void)
 {
 	jr.head = 0;
 	jr.tail = 0;
 	jr.read_idx = 0;
 	jr.write_idx = 0;
 	memset(jr.info, 0, sizeof(jr.info));
 	memset(jr.input_ring, 0, jr.size * sizeof(dma_addr_t));
 	memset(jr.output_ring, 0, jr.size * sizeof(struct op_ring));

 	return 0;
 }

 static int jr_hw_reset(void)
 {
 	struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
 	uint32_t timeout = 100000;
 	uint32_t jrint, jrcr;

 	sec_out32(&regs->jrcr, JRCR_RESET);
 	do {
 		jrint = sec_in32(&regs->jrint);
 	} while (((jrint & JRINT_ERR_HALT_MASK) ==
 		  JRINT_ERR_HALT_INPROGRESS) && --timeout);

 	jrint = sec_in32(&regs->jrint);
 	if (((jrint & JRINT_ERR_HALT_MASK) !=
 	     JRINT_ERR_HALT_INPROGRESS) && timeout == 0)
 		return -1;

 	timeout = 100000;
 	sec_out32(&regs->jrcr, JRCR_RESET);
 	do {
 		jrcr = sec_in32(&regs->jrcr);
 	} while ((jrcr & JRCR_RESET) && --timeout);

 	if (timeout == 0)
 		return -1;

 	return 0;
 }

 /* -1 --- error, can't enqueue -- no space available */
 static int jr_enqueue(uint32_t *desc_addr,
 	       void (*callback)(uint32_t desc, uint32_t status, void *arg),
 	       void *arg)
 {
 	struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
 	int head = jr.head;
 	dma_addr_t desc_phys_addr = virt_to_phys(desc_addr);

 	if (sec_in32(&regs->irsa) == 0 ||
 	    CIRC_SPACE(jr.head, jr.tail, jr.size) <= 0)
 		return -1;

 	jr.info[head].desc_phys_addr = desc_phys_addr;
 	jr.info[head].desc_addr = (uint32_t)desc_addr;
 	jr.info[head].callback = (void *)callback;
 	jr.info[head].arg = arg;
 	jr.info[head].op_done = 0;

 	unsigned long start = (unsigned long)&jr.info[head] &
 					~(ARCH_DMA_MINALIGN - 1);
 	unsigned long end = ALIGN(start + sizeof(struct jr_info),
 					ARCH_DMA_MINALIGN);
 	flush_dcache_range(start, end);

 	jr.input_ring[head] = desc_phys_addr;
 	start = (unsigned long)&jr.input_ring[head] & ~(ARCH_DMA_MINALIGN - 1);
 	end = ALIGN(start + sizeof(dma_addr_t), ARCH_DMA_MINALIGN);
 	flush_dcache_range(start, end);

 	jr.head = (head + 1) & (jr.size - 1);

 	sec_out32(&regs->irja, 1);

 	return 0;
 }

 static int jr_dequeue(void)
 {
 	struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
 	int head = jr.head;
 	int tail = jr.tail;
 	int idx, i, found;
 	void (*callback)(uint32_t desc, uint32_t status, void *arg);
 	void *arg = NULL;

 	while (sec_in32(&regs->orsf) && CIRC_CNT(jr.head, jr.tail, jr.size)) {
 		unsigned long start = (unsigned long)jr.output_ring &
 					~(ARCH_DMA_MINALIGN - 1);
 		unsigned long end = ALIGN(start +
 					  sizeof(struct op_ring)*JR_SIZE,
 					  ARCH_DMA_MINALIGN);
 		invalidate_dcache_range(start, end);

 		found = 0;

 		dma_addr_t op_desc = jr.output_ring[jr.tail].desc;
 		uint32_t status = jr.output_ring[jr.tail].status;
 		uint32_t desc_virt;

 		for (i = 0; CIRC_CNT(head, tail + i, jr.size) >= 1; i++) {
 			idx = (tail + i) & (jr.size - 1);
 			if (op_desc == jr.info[idx].desc_phys_addr) {
 				desc_virt = jr.info[idx].desc_addr;
 				found = 1;
 				break;
 			}
 		}

 		/* Error condition if match not found */
 		if (!found)
 			return -1;

 		jr.info[idx].op_done = 1;
 		callback = (void *)jr.info[idx].callback;
 		arg = jr.info[idx].arg;

 		/* When the job on tail idx gets done, increment
 		 * tail till the point where job completed out of oredr has
 		 * been taken into account
 		 */
 		if (idx == tail)
 			do {
 				tail = (tail + 1) & (jr.size - 1);
 			} while (jr.info[tail].op_done);

 		jr.tail = tail;
 		jr.read_idx = (jr.read_idx + 1) & (jr.size - 1);

 		sec_out32(&regs->orjr, 1);
 		jr.info[idx].op_done = 0;

 		callback(desc_virt, status, arg);
 	}

 	return 0;
 }

 static void desc_done(uint32_t desc, uint32_t status, void *arg)
 {
 	struct result *x = arg;
 	x->status = status;
 	caam_jr_strstatus(status);
 	x->done = 1;
 }

 int run_descriptor_jr(uint32_t *desc)
 {
 	unsigned long long timeval = get_ticks();
 	unsigned long long timeout = usec2ticks(CONFIG_SEC_DEQ_TIMEOUT);
 	struct result op;
 	int ret = 0;

 	memset(&op, 0, sizeof(op));

 	ret = jr_enqueue(desc, desc_done, &op);
 	if (ret) {
 		debug("Error in SEC enq\n");
 		ret = JQ_ENQ_ERR;
 		goto out;
 	}

 	timeval = get_ticks();
 	timeout = usec2ticks(CONFIG_SEC_DEQ_TIMEOUT);
 	while (op.done != 1) {
 		ret = jr_dequeue();
 		if (ret) {
 			debug("Error in SEC deq\n");
 			ret = JQ_DEQ_ERR;
 			goto out;
 		}

 		if ((get_ticks() - timeval) > timeout) {
 			debug("SEC Dequeue timed out\n");
 			ret = JQ_DEQ_TO_ERR;
 			goto out;
 		}
 	}

 	if (!op.status) {
 		debug("Error %x\n", op.status);
 		ret = op.status;
 	}
 out:
 	return ret;
 }

 int jr_reset(void)
 {
 	if (jr_hw_reset() < 0)
 		return -1;

 	/* Clean up the jobring structure maintained by software */
 	jr_sw_cleanup();

 	return 0;
 }

 int sec_reset(void)
 {
 	ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
 	uint32_t mcfgr = sec_in32(&sec->mcfgr);
 	uint32_t timeout = 100000;

 	mcfgr |= MCFGR_SWRST;
 	sec_out32(&sec->mcfgr, mcfgr);

 	mcfgr |= MCFGR_DMA_RST;
 	sec_out32(&sec->mcfgr, mcfgr);
 	do {
 		mcfgr = sec_in32(&sec->mcfgr);
 	} while ((mcfgr & MCFGR_DMA_RST) == MCFGR_DMA_RST && --timeout);

 	if (timeout == 0)
 		return -1;

 	timeout = 100000;
 	do {
 		mcfgr = sec_in32(&sec->mcfgr);
 	} while ((mcfgr & MCFGR_SWRST) == MCFGR_SWRST && --timeout);

 	if (timeout == 0)
 		return -1;

 	return 0;
 }

 static int instantiate_rng(void)
 {
 	struct result op;
 	u32 *desc;
 	u32 rdsta_val;
 	int ret = 0;
 	ccsr_sec_t __iomem *sec =
 			(ccsr_sec_t __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
 	struct rng4tst __iomem *rng =
 			(struct rng4tst __iomem *)&sec->rng;

 	memset(&op, 0, sizeof(struct result));

 	desc = memalign(ARCH_DMA_MINALIGN, sizeof(uint32_t) * 6);
 	if (!desc) {
 		printf("cannot allocate RNG init descriptor memory\n");
 		return -1;
 	}

 	inline_cnstr_jobdesc_rng_instantiation(desc);
 	int size = roundup(sizeof(uint32_t) * 6, ARCH_DMA_MINALIGN);
 	flush_dcache_range((unsigned long)desc,
 			   (unsigned long)desc + size);

 	ret = run_descriptor_jr(desc);

 	if (ret)
 		printf("RNG: Instantiation failed with error %x\n", ret);

 	rdsta_val = sec_in32(&rng->rdsta);
 	if (op.status || !(rdsta_val & RNG_STATE0_HANDLE_INSTANTIATED))
 		return -1;

 	return ret;
 }

 static u8 get_rng_vid(void)
 {
 	ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
 	u32 cha_vid = sec_in32(&sec->chavid_ls);

 	return (cha_vid & SEC_CHAVID_RNG_LS_MASK) >> SEC_CHAVID_LS_RNG_SHIFT;
 }

 /*
  * By default, the TRNG runs for 200 clocks per sample;
  * 1200 clocks per sample generates better entropy.
  */
 static void kick_trng(int ent_delay)
 {
 	ccsr_sec_t __iomem *sec =
 			(ccsr_sec_t __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
 	struct rng4tst __iomem *rng =
 			(struct rng4tst __iomem *)&sec->rng;
 	u32 val;

 	/* put RNG4 into program mode */
 	sec_setbits32(&rng->rtmctl, RTMCTL_PRGM);
 	/* rtsdctl bits 0-15 contain "Entropy Delay, which defines the
 	 * length (in system clocks) of each Entropy sample taken
 	 * */
 	val = sec_in32(&rng->rtsdctl);
 	val = (val & ~RTSDCTL_ENT_DLY_MASK) |
 	      (ent_delay << RTSDCTL_ENT_DLY_SHIFT);
 	sec_out32(&rng->rtsdctl, val);
 	/* min. freq. count, equal to 1/4 of the entropy sample length */
 	sec_out32(&rng->rtfreqmin, ent_delay >> 2);
 	/* disable maximum frequency count */
 	sec_out32(&rng->rtfreqmax, RTFRQMAX_DISABLE);
 	/* put RNG4 into run mode */
 	sec_clrbits32(&rng->rtmctl, RTMCTL_PRGM);
 }

 static int rng_init(void)
 {
 	int ret, ent_delay = RTSDCTL_ENT_DLY_MIN;
 	ccsr_sec_t __iomem *sec =
 			(ccsr_sec_t __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
 	struct rng4tst __iomem *rng =
 			(struct rng4tst __iomem *)&sec->rng;

 	u32 rdsta = sec_in32(&rng->rdsta);

 	/* Check if RNG state 0 handler is already instantiated */
 	if (rdsta & RNG_STATE0_HANDLE_INSTANTIATED)
 		return 0;

 	do {
 		/*
 		 * If either of the SH's were instantiated by somebody else
 		 * then it is assumed that the entropy
 		 * parameters are properly set and thus the function
 		 * setting these (kick_trng(...)) is skipped.
 		 * Also, if a handle was instantiated, do not change
 		 * the TRNG parameters.
 		 */
 		kick_trng(ent_delay);
 		ent_delay += 400;
 		/*
 		 * if instantiate_rng(...) fails, the loop will rerun
 		 * and the kick_trng(...) function will modfiy the
 		 * upper and lower limits of the entropy sampling
 		 * interval, leading to a sucessful initialization of
 		 * the RNG.
 		 */
 		ret = instantiate_rng();
 	} while ((ret == -1) && (ent_delay < RTSDCTL_ENT_DLY_MAX));
 	if (ret) {
 		printf("RNG: Failed to instantiate RNG\n");
 		return ret;
 	}

 	 /* Enable RDB bit so that RNG works faster */
 	sec_setbits32(&sec->scfgr, SEC_SCFGR_RDBENABLE);

 	return ret;
 }

 int sec_init(void)
 {
 	int ret = 0;

 #ifdef CONFIG_PHYS_64BIT
 	ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
 	uint32_t mcr = sec_in32(&sec->mcfgr);

 	sec_out32(&sec->mcfgr, mcr | 1 << MCFGR_PS_SHIFT);
 #endif
 	ret = jr_init();
 	if (ret < 0) {
 		printf("SEC initialization failed\n");
 		return -1;
 	}

 	if (get_rng_vid() >= 4) {
 		if (rng_init() < 0) {
 			printf("RNG instantiation failed\n");
 			return -1;
 		}
 		printf("SEC: RNG instantiated\n");
 	}

 	return ret;
 }
	/*
	* Copyright 2008-2014 Freescale Semiconductor, Inc.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*
	* Based on CAAM driver in drivers/crypto/caam in Linux
	*/

	#include <common.h>
	#include <malloc.h>
	#include "fsl_sec.h"
	#include "jr.h"
	#include "jobdesc.h"

	#define CIRC_CNT(head, tail, size) (((head) - (tail)) & (size - 1))
	#define CIRC_SPACE(head, tail, size) CIRC_CNT((tail), (head) + 1, (size))

	struct jobring jr;

	static inline void start_jr0(void)
	{
	ccsr_sec_t sec = (void )CONFIG_SYS_FSL_SEC_ADDR;
	u32 ctpr_ms = sec_in32(&sec->ctpr_ms);
	u32 scfgr = sec_in32(&sec->scfgr);

	if (ctpr_ms & SEC_CTPR_MS_VIRT_EN_INCL) {
	/* VIRT_EN_INCL = 1 & VIRT_EN_POR = 1 or
	* VIRT_EN_INCL = 1 & VIRT_EN_POR = 0 & SEC_SCFGR_VIRT_EN = 1
	*/
	if ((ctpr_ms & SEC_CTPR_MS_VIRT_EN_POR) \|\|
	(!(ctpr_ms & SEC_CTPR_MS_VIRT_EN_POR) &&
	(scfgr & SEC_SCFGR_VIRT_EN)))
	sec_out32(&sec->jrstartr, CONFIG_JRSTARTR_JR0);
	} else {
	/* VIRT_EN_INCL = 0 && VIRT_EN_POR_VALUE = 1 */
	if (ctpr_ms & SEC_CTPR_MS_VIRT_EN_POR)
	sec_out32(&sec->jrstartr, CONFIG_JRSTARTR_JR0);
	}
	}

	static inline void jr_reset_liodn(void)
	{
	ccsr_sec_t sec = (void )CONFIG_SYS_FSL_SEC_ADDR;
	sec_out32(&sec->jrliodnr[0].ls, 0);
	}

	static inline void jr_disable_irq(void)
	{
	struct jr_regs regs = (struct jr_regs )CONFIG_SYS_FSL_JR0_ADDR;
	uint32_t jrcfg = sec_in32(&regs->jrcfg1);

	jrcfg = jrcfg \| JR_INTMASK;

	sec_out32(&regs->jrcfg1, jrcfg);
	}

	static void jr_initregs(void)
	{
	struct jr_regs regs = (struct jr_regs )CONFIG_SYS_FSL_JR0_ADDR;
	phys_addr_t ip_base = virt_to_phys((void *)jr.input_ring);
	phys_addr_t op_base = virt_to_phys((void *)jr.output_ring);

	#ifdef CONFIG_PHYS_64BIT
	sec_out32(&regs->irba_h, ip_base >> 32);
	#else
	sec_out32(&regs->irba_h, 0x0);
	#endif
	sec_out32(&regs->irba_l, (uint32_t)ip_base);
	#ifdef CONFIG_PHYS_64BIT
	sec_out32(&regs->orba_h, op_base >> 32);
	#else
	sec_out32(&regs->orba_h, 0x0);
	#endif
	sec_out32(&regs->orba_l, (uint32_t)op_base);
	sec_out32(&regs->ors, JR_SIZE);
	sec_out32(&regs->irs, JR_SIZE);

	if (!jr.irq)
	jr_disable_irq();
	}

	static int jr_init(void)
	{
	memset(&jr, 0, sizeof(struct jobring));

	jr.jq_id = DEFAULT_JR_ID;
	jr.irq = DEFAULT_IRQ;

	#ifdef CONFIG_FSL_CORENET
	jr.liodn = DEFAULT_JR_LIODN;
	#endif
	jr.size = JR_SIZE;
	jr.input_ring = (dma_addr_t *)memalign(ARCH_DMA_MINALIGN,
	JR_SIZE * sizeof(dma_addr_t));
	if (!jr.input_ring)
	return -1;
	jr.output_ring =
	(struct op_ring *)memalign(ARCH_DMA_MINALIGN,
	JR_SIZE * sizeof(struct op_ring));
	if (!jr.output_ring)
	return -1;

	memset(jr.input_ring, 0, JR_SIZE * sizeof(dma_addr_t));
	memset(jr.output_ring, 0, JR_SIZE * sizeof(struct op_ring));

	start_jr0();

	jr_initregs();

	return 0;
	}

	static int jr_sw_cleanup(void)
	{
	jr.head = 0;
	jr.tail = 0;
	jr.read_idx = 0;
	jr.write_idx = 0;
	memset(jr.info, 0, sizeof(jr.info));
	memset(jr.input_ring, 0, jr.size * sizeof(dma_addr_t));
	memset(jr.output_ring, 0, jr.size * sizeof(struct op_ring));

	return 0;
	}

	static int jr_hw_reset(void)
	{
	struct jr_regs regs = (struct jr_regs )CONFIG_SYS_FSL_JR0_ADDR;
	uint32_t timeout = 100000;
	uint32_t jrint, jrcr;

	sec_out32(&regs->jrcr, JRCR_RESET);
	do {
	jrint = sec_in32(&regs->jrint);
	} while (((jrint & JRINT_ERR_HALT_MASK) ==
	JRINT_ERR_HALT_INPROGRESS) && --timeout);

	jrint = sec_in32(&regs->jrint);
	if (((jrint & JRINT_ERR_HALT_MASK) !=
	JRINT_ERR_HALT_INPROGRESS) && timeout == 0)
	return -1;

	timeout = 100000;
	sec_out32(&regs->jrcr, JRCR_RESET);
	do {
	jrcr = sec_in32(&regs->jrcr);
	} while ((jrcr & JRCR_RESET) && --timeout);

	if (timeout == 0)
	return -1;

	return 0;
	}

	/* -1 --- error, can't enqueue -- no space available */
	static int jr_enqueue(uint32_t *desc_addr,
	void (callback)(uint32_t desc, uint32_t status, void arg),
	void *arg)
	{
	struct jr_regs regs = (struct jr_regs )CONFIG_SYS_FSL_JR0_ADDR;
	int head = jr.head;
	dma_addr_t desc_phys_addr = virt_to_phys(desc_addr);

	if (sec_in32(&regs->irsa) == 0 \|\|
	CIRC_SPACE(jr.head, jr.tail, jr.size) <= 0)
	return -1;

	jr.info[head].desc_phys_addr = desc_phys_addr;
	jr.info[head].desc_addr = (uint32_t)desc_addr;
	jr.info[head].callback = (void *)callback;
	jr.info[head].arg = arg;
	jr.info[head].op_done = 0;

	unsigned long start = (unsigned long)&jr.info[head] &
	~(ARCH_DMA_MINALIGN - 1);
	unsigned long end = ALIGN(start + sizeof(struct jr_info),
	ARCH_DMA_MINALIGN);
	flush_dcache_range(start, end);

	jr.input_ring[head] = desc_phys_addr;
	start = (unsigned long)&jr.input_ring[head] & ~(ARCH_DMA_MINALIGN - 1);
	end = ALIGN(start + sizeof(dma_addr_t), ARCH_DMA_MINALIGN);
	flush_dcache_range(start, end);

	jr.head = (head + 1) & (jr.size - 1);

	sec_out32(&regs->irja, 1);

	return 0;
	}

	static int jr_dequeue(void)
	{
	struct jr_regs regs = (struct jr_regs )CONFIG_SYS_FSL_JR0_ADDR;
	int head = jr.head;
	int tail = jr.tail;
	int idx, i, found;
	void (callback)(uint32_t desc, uint32_t status, void arg);
	void *arg = NULL;

	while (sec_in32(&regs->orsf) && CIRC_CNT(jr.head, jr.tail, jr.size)) {
	unsigned long start = (unsigned long)jr.output_ring &
	~(ARCH_DMA_MINALIGN - 1);
	unsigned long end = ALIGN(start +
	sizeof(struct op_ring)*JR_SIZE,
	ARCH_DMA_MINALIGN);
	invalidate_dcache_range(start, end);

	found = 0;

	dma_addr_t op_desc = jr.output_ring[jr.tail].desc;
	uint32_t status = jr.output_ring[jr.tail].status;
	uint32_t desc_virt;

	for (i = 0; CIRC_CNT(head, tail + i, jr.size) >= 1; i++) {
	idx = (tail + i) & (jr.size - 1);
	if (op_desc == jr.info[idx].desc_phys_addr) {
	desc_virt = jr.info[idx].desc_addr;
	found = 1;
	break;
	}
	}

	/* Error condition if match not found */
	if (!found)
	return -1;

	jr.info[idx].op_done = 1;
	callback = (void *)jr.info[idx].callback;
	arg = jr.info[idx].arg;

	/* When the job on tail idx gets done, increment
	* tail till the point where job completed out of oredr has
	* been taken into account
	*/
	if (idx == tail)
	do {
	tail = (tail + 1) & (jr.size - 1);
	} while (jr.info[tail].op_done);

	jr.tail = tail;
	jr.read_idx = (jr.read_idx + 1) & (jr.size - 1);

	sec_out32(&regs->orjr, 1);
	jr.info[idx].op_done = 0;

	callback(desc_virt, status, arg);
	}

	return 0;
	}

	static void desc_done(uint32_t desc, uint32_t status, void *arg)
	{
	struct result *x = arg;
	x->status = status;
	caam_jr_strstatus(status);
	x->done = 1;
	}

	int run_descriptor_jr(uint32_t *desc)
	{
	unsigned long long timeval = get_ticks();
	unsigned long long timeout = usec2ticks(CONFIG_SEC_DEQ_TIMEOUT);
	struct result op;
	int ret = 0;

	memset(&op, 0, sizeof(op));

	ret = jr_enqueue(desc, desc_done, &op);
	if (ret) {
	debug("Error in SEC enq\n");
	ret = JQ_ENQ_ERR;
	goto out;
	}

	timeval = get_ticks();
	timeout = usec2ticks(CONFIG_SEC_DEQ_TIMEOUT);
	while (op.done != 1) {
	ret = jr_dequeue();
	if (ret) {
	debug("Error in SEC deq\n");
	ret = JQ_DEQ_ERR;
	goto out;
	}

	if ((get_ticks() - timeval) > timeout) {
	debug("SEC Dequeue timed out\n");
	ret = JQ_DEQ_TO_ERR;
	goto out;
	}
	}

	if (!op.status) {
	debug("Error %x\n", op.status);
	ret = op.status;
	}
	out:
	return ret;
	}

	int jr_reset(void)
	{
	if (jr_hw_reset() < 0)
	return -1;

	/* Clean up the jobring structure maintained by software */
	jr_sw_cleanup();

	return 0;
	}

	int sec_reset(void)
	{
	ccsr_sec_t sec = (void )CONFIG_SYS_FSL_SEC_ADDR;
	uint32_t mcfgr = sec_in32(&sec->mcfgr);
	uint32_t timeout = 100000;

	mcfgr \|= MCFGR_SWRST;
	sec_out32(&sec->mcfgr, mcfgr);

	mcfgr \|= MCFGR_DMA_RST;
	sec_out32(&sec->mcfgr, mcfgr);
	do {
	mcfgr = sec_in32(&sec->mcfgr);
	} while ((mcfgr & MCFGR_DMA_RST) == MCFGR_DMA_RST && --timeout);

	if (timeout == 0)
	return -1;

	timeout = 100000;
	do {
	mcfgr = sec_in32(&sec->mcfgr);
	} while ((mcfgr & MCFGR_SWRST) == MCFGR_SWRST && --timeout);

	if (timeout == 0)
	return -1;

	return 0;
	}

	static int instantiate_rng(void)
	{
	struct result op;
	u32 *desc;
	u32 rdsta_val;
	int ret = 0;
	ccsr_sec_t __iomem *sec =
	(ccsr_sec_t __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
	struct rng4tst __iomem *rng =
	(struct rng4tst __iomem *)&sec->rng;

	memset(&op, 0, sizeof(struct result));

	desc = memalign(ARCH_DMA_MINALIGN, sizeof(uint32_t) * 6);
	if (!desc) {
	printf("cannot allocate RNG init descriptor memory\n");
	return -1;
	}

	inline_cnstr_jobdesc_rng_instantiation(desc);
	int size = roundup(sizeof(uint32_t) * 6, ARCH_DMA_MINALIGN);
	flush_dcache_range((unsigned long)desc,
	(unsigned long)desc + size);

	ret = run_descriptor_jr(desc);

	if (ret)
	printf("RNG: Instantiation failed with error %x\n", ret);

	rdsta_val = sec_in32(&rng->rdsta);
	if (op.status \|\| !(rdsta_val & RNG_STATE0_HANDLE_INSTANTIATED))
	return -1;

	return ret;
	}

	static u8 get_rng_vid(void)
	{
	ccsr_sec_t sec = (void )CONFIG_SYS_FSL_SEC_ADDR;
	u32 cha_vid = sec_in32(&sec->chavid_ls);

	return (cha_vid & SEC_CHAVID_RNG_LS_MASK) >> SEC_CHAVID_LS_RNG_SHIFT;
	}

	/*
	* By default, the TRNG runs for 200 clocks per sample;
	* 1200 clocks per sample generates better entropy.
	*/
	static void kick_trng(int ent_delay)
	{
	ccsr_sec_t __iomem *sec =
	(ccsr_sec_t __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
	struct rng4tst __iomem *rng =
	(struct rng4tst __iomem *)&sec->rng;
	u32 val;

	/* put RNG4 into program mode */
	sec_setbits32(&rng->rtmctl, RTMCTL_PRGM);
	/* rtsdctl bits 0-15 contain "Entropy Delay, which defines the
	* length (in system clocks) of each Entropy sample taken
	* */
	val = sec_in32(&rng->rtsdctl);
	val = (val & ~RTSDCTL_ENT_DLY_MASK) \|
	(ent_delay << RTSDCTL_ENT_DLY_SHIFT);
	sec_out32(&rng->rtsdctl, val);
	/* min. freq. count, equal to 1/4 of the entropy sample length */
	sec_out32(&rng->rtfreqmin, ent_delay >> 2);
	/* disable maximum frequency count */
	sec_out32(&rng->rtfreqmax, RTFRQMAX_DISABLE);
	/* put RNG4 into run mode */
	sec_clrbits32(&rng->rtmctl, RTMCTL_PRGM);
	}

	static int rng_init(void)
	{
	int ret, ent_delay = RTSDCTL_ENT_DLY_MIN;
	ccsr_sec_t __iomem *sec =
	(ccsr_sec_t __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
	struct rng4tst __iomem *rng =
	(struct rng4tst __iomem *)&sec->rng;

	u32 rdsta = sec_in32(&rng->rdsta);

	/* Check if RNG state 0 handler is already instantiated */
	if (rdsta & RNG_STATE0_HANDLE_INSTANTIATED)
	return 0;

	do {
	/*
	* If either of the SH's were instantiated by somebody else
	* then it is assumed that the entropy
	* parameters are properly set and thus the function
	* setting these (kick_trng(...)) is skipped.
	* Also, if a handle was instantiated, do not change
	* the TRNG parameters.
	*/
	kick_trng(ent_delay);
	ent_delay += 400;
	/*
	* if instantiate_rng(...) fails, the loop will rerun
	* and the kick_trng(...) function will modfiy the
	* upper and lower limits of the entropy sampling
	* interval, leading to a sucessful initialization of
	* the RNG.
	*/
	ret = instantiate_rng();
	} while ((ret == -1) && (ent_delay < RTSDCTL_ENT_DLY_MAX));
	if (ret) {
	printf("RNG: Failed to instantiate RNG\n");
	return ret;
	}

	/* Enable RDB bit so that RNG works faster */
	sec_setbits32(&sec->scfgr, SEC_SCFGR_RDBENABLE);

	return ret;
	}

	int sec_init(void)
	{
	int ret = 0;

	#ifdef CONFIG_PHYS_64BIT
	ccsr_sec_t sec = (void )CONFIG_SYS_FSL_SEC_ADDR;
	uint32_t mcr = sec_in32(&sec->mcfgr);

	sec_out32(&sec->mcfgr, mcr \| 1 << MCFGR_PS_SHIFT);
	#endif
	ret = jr_init();
	if (ret < 0) {
	printf("SEC initialization failed\n");
	return -1;
	}

	if (get_rng_vid() >= 4) {
	if (rng_init() < 0) {
	printf("RNG instantiation failed\n");
	return -1;
	}
	printf("SEC: RNG instantiated\n");
	}

	return ret;
	}