jr_driver_config.h

/*
 * Copyright 2017-2020 NXP
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 */

#ifndef _JR_DRIVER_CONFIG_H_
#define _JR_DRIVER_CONFIG_H_

/* Helper defines  */

 /* Define used for setting a flag on  */
#define  ON  1
 /* Define used for setting a flag off  */
#define  OFF 0

 /* SEC is configured to start work in polling mode,  */
#define SEC_STARTUP_POLLING_MODE     0
/*
 * SEC is configured to start work in interrupt mode,
 *  when configured for NAPI notification style.
 */
#define SEC_STARTUP_INTERRUPT_MODE   1

/*
 * SEC driver will use ONLY interrupts to receive notifications
 * for processed packets from SEC engine hardware.
 */
#define SEC_NOTIFICATION_TYPE_IRQ   1
/*
 * SEC driver will use ONLY polling to receive notifications
 * for processed packets from SEC engine hardware.
 */
#define SEC_NOTIFICATION_TYPE_POLL  2

/*
 * Determines how SEC user space driver will receive notifications
 * for processed packets from SEC engine.
 * Valid values are: #SEC_NOTIFICATION_TYPE_POLL, #SEC_NOTIFICATION_TYPE_IRQ
 */
#define SEC_NOTIFICATION_TYPE   SEC_NOTIFICATION_TYPE_POLL

 /* Maximum number of job rings supported by SEC hardware  */
#define MAX_SEC_JOB_RINGS         1

/*
 * Size of cryptographic context that is used directly in communicating
 *  with SEC device.
 *  SEC device works only with physical addresses. This is the maximum size
 *  for a SEC descriptor ( = 64 words).
 */

#define SEC_CRYPTO_DESCRIPTOR_SIZE  256

/*
 * Size of job descriptor submitted to SEC device for each packet to be
 *  processed.
 *  Job descriptor contains 3 DMA address pointers:
 *      - to shared descriptor, to input buffer and to output buffer.
 *  The job descriptor contains other SEC specific commands as well:
 *      - HEADER command, SEQ IN PTR command SEQ OUT PTR command and opaque
 *        data, each measuring 4 bytes.
 *  Job descriptor size, depending on physical address representation:
 *      - 32 bit - size is 28 bytes - cacheline-aligned size is 64 bytes
 *      - 36 bit - size is 40 bytes - cacheline-aligned size is 64 bytes
 *  @note: Job descriptor must be cacheline-aligned to ensure efficient memory
 *  access.
 *  @note: If other format is used for job descriptor, then the size must be
 *  revised.
 */

#define SEC_JOB_DESCRIPTOR_SIZE		64

/*
 * Size of one entry in the input ring of a job ring.
 *  Input ring contains pointers to job descriptors.
 *  The memory used for an input ring and output ring must be physically
 *  contiguous.
 */

#define SEC_JOB_INPUT_RING_ENTRY_SIZE	sizeof(phys_addr_t)

/*
 * Size of one entry in the output ring of a job ring.
 *  Output ring entry is a pointer to a job descriptor followed by a 4 byte
 *  status word.
 *  The memory used for an input ring and output ring must be physically
 *  contiguous.
 *  @note If desired to use also the optional SEQ OUT indication in output
 *  ring entries, then 4 more bytes must be added to the size.
 */

#define SEC_JOB_OUTPUT_RING_ENTRY_SIZE	(SEC_JOB_INPUT_RING_ENTRY_SIZE + 4)

 /* DMA memory required for an input ring of a job ring.  */
#define SEC_DMA_MEM_INPUT_RING_SIZE	\
		((SEC_JOB_INPUT_RING_ENTRY_SIZE) * (SEC_JOB_RING_SIZE))

/*
 * DMA memory required for an output ring of a job ring.
 *  Required extra 4 byte for status word per each entry.
 */
#define SEC_DMA_MEM_OUTPUT_RING_SIZE	\
		((SEC_JOB_OUTPUT_RING_ENTRY_SIZE) * (SEC_JOB_RING_SIZE))

 /* DMA memory required for descriptors of a job ring.  */
#define SEC_DMA_MEM_DESCRIPTORS		\
		((SEC_CRYPTO_DESCRIPTOR_SIZE)*(SEC_JOB_RING_SIZE))

 /* DMA memory required for a job ring, including both input output rings.  */
#define SEC_DMA_MEM_JOB_RING_SIZE	\
		((SEC_DMA_MEM_INPUT_RING_SIZE) +	\
		(SEC_DMA_MEM_OUTPUT_RING_SIZE))

/*
 * When calling sec_init() UA will provide an area of virtual memory
 *  of size #SEC_DMA_MEMORY_SIZE to be  used internally by the driver
 *  to allocate data (like SEC descriptors) that needs to be passed to
 *  SEC device in physical addressing and later on retrieved from SEC device.
 *  At initialization the UA provides specialized ptov/vtop functions/macros to
 *  translate addresses allocated from this memory area.
 */
#define SEC_DMA_MEMORY_SIZE		\
		((SEC_DMA_MEM_JOB_RING_SIZE) * (MAX_SEC_JOB_RINGS))

/*
 * SEC DEVICE related configuration.

 * Enable/Disable logging support at compile time.
 * Valid values:
 * ON - enable logging
 * OFF - disable logging
 * The messages are logged at stdout.
 */

#define SEC_DRIVER_LOGGING OFF

/*
 * Configure logging level at compile time.
 * Valid values:
 * SEC_DRIVER_LOG_ERROR - log only errors
 * SEC_DRIVER_LOG_INFO  - log errors and info messages
 * SEC_DRIVER_LOG_DEBUG - log errors, info and debug messages
 */

#define SEC_DRIVER_LOGGING_LEVEL SEC_DRIVER_LOG_DEBUG

/*
 * SEC JOB RING related configuration.

 * Configure the size of the JOB RING.
 * The maximum size of the ring is hardware limited to 1024.
 * However the number of packets in flight in a time interval of
 * 1ms can be calculated
 * from the traffic rate (Mbps) and packet size.
 * Here it was considered a packet size of 40 bytes.
 * @note Round up to nearest power of 2 for optimized update
 * of producer/consumer indexes of each job ring
 * \todo Should set to 750, according to the calculation above, but
 * the JR size must be power of 2, thus the next closest value must
 * be chosen (i.e. 512 since 1024 is not available)
 * For firmware choose this to be 16
 */

#define SEC_JOB_RING_SIZE    16

/*
 * Interrupt coalescing related configuration.
 * NOTE: SEC hardware enabled interrupt
 * coalescing is not supported on SEC version 3.1!
 * SEC version 4.4 has support for interrupt
 * coalescing.
 */

#if SEC_NOTIFICATION_TYPE != SEC_NOTIFICATION_TYPE_POLL

#define SEC_INT_COALESCING_ENABLE   ON
/*
 * Interrupt Coalescing Descriptor Count Threshold.
 * While interrupt coalescing is enabled (ICEN=1), this value determines
 * how many Descriptors are completed before raising an interrupt.
 * Valid values for this field are from 0 to 255.
 * Note that a value of 1 functionally defeats the advantages of interrupt
 * coalescing since the threshold value is reached each time that a
 * Job Descriptor is completed. A value of 0 is treated in the same
 * manner as a value of 1.
 *
 */
#define SEC_INTERRUPT_COALESCING_DESCRIPTOR_COUNT_THRESH  10

/*
 * Interrupt Coalescing Timer Threshold.
 * While interrupt coalescing is enabled (ICEN=1), this value determines the
 * maximum amount of time after processing a Descriptor before raising an
 * interrupt.
 * The threshold value is represented in units equal to 64 CAAM interface
 * clocks. Valid values for this field are from 1 to 65535.
 * A value of 0 results in behavior identical to that when interrupt
 * coalescing is disabled.
 */
#define SEC_INTERRUPT_COALESCING_TIMER_THRESH  100
#endif /* SEC_NOTIFICATION_TYPE_POLL  */

#endif /* _JR_DRIVER_CONFIG_H_  */