xref: /openbmc/linux/drivers/crypto/ccree/cc_sram_mgr.h (revision 4c3f9727)

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */

#ifndef __CC_SRAM_MGR_H__
#define __CC_SRAM_MGR_H__

#ifndef CC_CC_SRAM_SIZE
#define CC_CC_SRAM_SIZE 4096
#endif

struct cc_drvdata;

/**
 * Address (offset) within CC internal SRAM
 */

typedef u64 cc_sram_addr_t;

#define NULL_SRAM_ADDR ((cc_sram_addr_t)-1)

/*!
 * Initializes SRAM pool.
 * The first X bytes of SRAM are reserved for ROM usage, hence, pool
 * starts right after X bytes.
 *
 * \param drvdata
 *
 * \return int Zero for success, negative value otherwise.
 */
int cc_sram_mgr_init(struct cc_drvdata *drvdata);

/*!
 * Uninits SRAM pool.
 *
 * \param drvdata
 */
void cc_sram_mgr_fini(struct cc_drvdata *drvdata);

/*!
 * Allocated buffer from SRAM pool.
 * Note: Caller is responsible to free the LAST allocated buffer.
 * This function does not taking care of any fragmentation may occur
 * by the order of calls to alloc/free.
 *
 * \param drvdata
 * \param size The requested bytes to allocate
 */
cc_sram_addr_t cc_sram_alloc(struct cc_drvdata *drvdata, u32 size);

/**
 * cc_set_sram_desc() - Create const descriptors sequence to
 *	set values in given array into SRAM.
 * Note: each const value can't exceed word size.
 *
 * @src:	  A pointer to array of words to set as consts.
 * @dst:	  The target SRAM buffer to set into
 * @nelements:	  The number of words in "src" array
 * @seq:	  A pointer to the given IN/OUT descriptor sequence
 * @seq_len:	  A pointer to the given IN/OUT sequence length
 */
void cc_set_sram_desc(const u32 *src, cc_sram_addr_t dst,
		      unsigned int nelement, struct cc_hw_desc *seq,
		      unsigned int *seq_len);

#endif /*__CC_SRAM_MGR_H__*/