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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __CARD_DDCB_H__
#define __CARD_DDCB_H__
/**
* IBM Accelerator Family 'GenWQE'
*
* (C) Copyright IBM Corp. 2013
*
* Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
* Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
* Author: Michael Jung <mijung@gmx.net>
* Author: Michael Ruettger <michael@ibmra.de>
*/
#include <linux/types.h>
#include <asm/byteorder.h>
#include "genwqe_driver.h"
#include "card_base.h"
/**
* struct ddcb - Device Driver Control Block DDCB
* @hsi: Hardware software interlock
* @shi: Software hardware interlock. Hsi and shi are used to interlock
* software and hardware activities. We are using a compare and
* swap operation to ensure that there are no races when
* activating new DDCBs on the queue, or when we need to
* purge a DDCB from a running queue.
* @acfunc: Accelerator function addresses a unit within the chip
* @cmd: Command to work on
* @cmdopts_16: Options for the command
* @asiv: Input data
* @asv: Output data
*
* The DDCB data format is big endian. Multiple consequtive DDBCs form
* a DDCB queue.
*/
#define ASIV_LENGTH 104 /* Old specification without ATS field */
#define ASIV_LENGTH_ATS 96 /* New specification with ATS field */
#define ASV_LENGTH 64
struct ddcb {
union {
__be32 icrc_hsi_shi_32; /* iCRC, Hardware/SW interlock */
struct {
__be16 icrc_16;
u8 hsi;
u8 shi;
};
};
u8 pre; /* Preamble */
u8 xdir; /* Execution Directives */
__be16 seqnum_16; /* Sequence Number */
u8 acfunc; /* Accelerator Function.. */
u8 cmd; /* Command. */
__be16 cmdopts_16; /* Command Options */
u8 sur; /* Status Update Rate */
u8 psp; /* Protection Section Pointer */
__be16 rsvd_0e_16; /* Reserved invariant */
__be64 fwiv_64; /* Firmware Invariant. */
union {
struct {
__be64 ats_64; /* Address Translation Spec */
u8 asiv[ASIV_LENGTH_ATS]; /* New ASIV */
} n;
u8 __asiv[ASIV_LENGTH]; /* obsolete */
};
u8 asv[ASV_LENGTH]; /* Appl Spec Variant */
__be16 rsvd_c0_16; /* Reserved Variant */
__be16 vcrc_16; /* Variant CRC */
__be32 rsvd_32; /* Reserved unprotected */
__be64 deque_ts_64; /* Deque Time Stamp. */
__be16 retc_16; /* Return Code */
__be16 attn_16; /* Attention/Extended Error Codes */
__be32 progress_32; /* Progress indicator. */
__be64 cmplt_ts_64; /* Completion Time Stamp. */
/* The following layout matches the new service layer format */
__be32 ibdc_32; /* Inbound Data Count (* 256) */
__be32 obdc_32; /* Outbound Data Count (* 256) */
__be64 rsvd_SLH_64; /* Reserved for hardware */
union { /* private data for driver */
u8 priv[8];
__be64 priv_64;
};
__be64 disp_ts_64; /* Dispatch TimeStamp */
} __attribute__((__packed__));
/* CRC polynomials for DDCB */
#define CRC16_POLYNOMIAL 0x1021
/*
* SHI: Software to Hardware Interlock
* This 1 byte field is written by software to interlock the
* movement of one queue entry to another with the hardware in the
* chip.
*/
#define DDCB_SHI_INTR 0x04 /* Bit 2 */
#define DDCB_SHI_PURGE 0x02 /* Bit 1 */
#define DDCB_SHI_NEXT 0x01 /* Bit 0 */
/*
* HSI: Hardware to Software interlock
* This 1 byte field is written by hardware to interlock the movement
* of one queue entry to another with the software in the chip.
*/
#define DDCB_HSI_COMPLETED 0x40 /* Bit 6 */
#define DDCB_HSI_FETCHED 0x04 /* Bit 2 */
/*
* Accessing HSI/SHI is done 32-bit wide
* Normally 16-bit access would work too, but on some platforms the
* 16 compare and swap operation is not supported. Therefore
* switching to 32-bit such that those platforms will work too.
*
* iCRC HSI/SHI
*/
#define DDCB_INTR_BE32 cpu_to_be32(0x00000004)
#define DDCB_PURGE_BE32 cpu_to_be32(0x00000002)
#define DDCB_NEXT_BE32 cpu_to_be32(0x00000001)
#define DDCB_COMPLETED_BE32 cpu_to_be32(0x00004000)
#define DDCB_FETCHED_BE32 cpu_to_be32(0x00000400)
/* Definitions of DDCB presets */
#define DDCB_PRESET_PRE 0x80
#define ICRC_LENGTH(n) ((n) + 8 + 8 + 8) /* used ASIV + hdr fields */
#define VCRC_LENGTH(n) ((n)) /* used ASV */
/*
* Genwqe Scatter Gather list
* Each element has up to 8 entries.
* The chaining element is element 0 cause of prefetching needs.
*/
/*
* 0b0110 Chained descriptor. The descriptor is describing the next
* descriptor list.
*/
#define SG_CHAINED (0x6)
/*
* 0b0010 First entry of a descriptor list. Start from a Buffer-Empty
* condition.
*/
#define SG_DATA (0x2)
/*
* 0b0000 Early terminator. This is the last entry on the list
* irregardless of the length indicated.
*/
#define SG_END_LIST (0x0)
/**
* struct sglist - Scatter gather list
* @target_addr: Either a dma addr of memory to work on or a
* dma addr or a subsequent sglist block.
* @len: Length of the data block.
* @flags: See above.
*
* Depending on the command the GenWQE card can use a scatter gather
* list to describe the memory it works on. Always 8 sg_entry's form
* a block.
*/
struct sg_entry {
__be64 target_addr;
__be32 len;
__be32 flags;
};
#endif /* __CARD_DDCB_H__ */
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