1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef __CARD_DDCB_H__ 3 #define __CARD_DDCB_H__ 4 5 /** 6 * IBM Accelerator Family 'GenWQE' 7 * 8 * (C) Copyright IBM Corp. 2013 9 * 10 * Author: Frank Haverkamp <haver@linux.vnet.ibm.com> 11 * Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com> 12 * Author: Michael Jung <mijung@gmx.net> 13 * Author: Michael Ruettger <michael@ibmra.de> 14 */ 15 16 #include <linux/types.h> 17 #include <asm/byteorder.h> 18 19 #include "genwqe_driver.h" 20 #include "card_base.h" 21 22 /** 23 * struct ddcb - Device Driver Control Block DDCB 24 * @hsi: Hardware software interlock 25 * @shi: Software hardware interlock. Hsi and shi are used to interlock 26 * software and hardware activities. We are using a compare and 27 * swap operation to ensure that there are no races when 28 * activating new DDCBs on the queue, or when we need to 29 * purge a DDCB from a running queue. 30 * @acfunc: Accelerator function addresses a unit within the chip 31 * @cmd: Command to work on 32 * @cmdopts_16: Options for the command 33 * @asiv: Input data 34 * @asv: Output data 35 * 36 * The DDCB data format is big endian. Multiple consequtive DDBCs form 37 * a DDCB queue. 38 */ 39 #define ASIV_LENGTH 104 /* Old specification without ATS field */ 40 #define ASIV_LENGTH_ATS 96 /* New specification with ATS field */ 41 #define ASV_LENGTH 64 42 43 struct ddcb { 44 union { 45 __be32 icrc_hsi_shi_32; /* iCRC, Hardware/SW interlock */ 46 struct { 47 __be16 icrc_16; 48 u8 hsi; 49 u8 shi; 50 }; 51 }; 52 u8 pre; /* Preamble */ 53 u8 xdir; /* Execution Directives */ 54 __be16 seqnum_16; /* Sequence Number */ 55 56 u8 acfunc; /* Accelerator Function.. */ 57 u8 cmd; /* Command. */ 58 __be16 cmdopts_16; /* Command Options */ 59 u8 sur; /* Status Update Rate */ 60 u8 psp; /* Protection Section Pointer */ 61 __be16 rsvd_0e_16; /* Reserved invariant */ 62 63 __be64 fwiv_64; /* Firmware Invariant. */ 64 65 union { 66 struct { 67 __be64 ats_64; /* Address Translation Spec */ 68 u8 asiv[ASIV_LENGTH_ATS]; /* New ASIV */ 69 } n; 70 u8 __asiv[ASIV_LENGTH]; /* obsolete */ 71 }; 72 u8 asv[ASV_LENGTH]; /* Appl Spec Variant */ 73 74 __be16 rsvd_c0_16; /* Reserved Variant */ 75 __be16 vcrc_16; /* Variant CRC */ 76 __be32 rsvd_32; /* Reserved unprotected */ 77 78 __be64 deque_ts_64; /* Deque Time Stamp. */ 79 80 __be16 retc_16; /* Return Code */ 81 __be16 attn_16; /* Attention/Extended Error Codes */ 82 __be32 progress_32; /* Progress indicator. */ 83 84 __be64 cmplt_ts_64; /* Completion Time Stamp. */ 85 86 /* The following layout matches the new service layer format */ 87 __be32 ibdc_32; /* Inbound Data Count (* 256) */ 88 __be32 obdc_32; /* Outbound Data Count (* 256) */ 89 90 __be64 rsvd_SLH_64; /* Reserved for hardware */ 91 union { /* private data for driver */ 92 u8 priv[8]; 93 __be64 priv_64; 94 }; 95 __be64 disp_ts_64; /* Dispatch TimeStamp */ 96 } __attribute__((__packed__)); 97 98 /* CRC polynomials for DDCB */ 99 #define CRC16_POLYNOMIAL 0x1021 100 101 /* 102 * SHI: Software to Hardware Interlock 103 * This 1 byte field is written by software to interlock the 104 * movement of one queue entry to another with the hardware in the 105 * chip. 106 */ 107 #define DDCB_SHI_INTR 0x04 /* Bit 2 */ 108 #define DDCB_SHI_PURGE 0x02 /* Bit 1 */ 109 #define DDCB_SHI_NEXT 0x01 /* Bit 0 */ 110 111 /* 112 * HSI: Hardware to Software interlock 113 * This 1 byte field is written by hardware to interlock the movement 114 * of one queue entry to another with the software in the chip. 115 */ 116 #define DDCB_HSI_COMPLETED 0x40 /* Bit 6 */ 117 #define DDCB_HSI_FETCHED 0x04 /* Bit 2 */ 118 119 /* 120 * Accessing HSI/SHI is done 32-bit wide 121 * Normally 16-bit access would work too, but on some platforms the 122 * 16 compare and swap operation is not supported. Therefore 123 * switching to 32-bit such that those platforms will work too. 124 * 125 * iCRC HSI/SHI 126 */ 127 #define DDCB_INTR_BE32 cpu_to_be32(0x00000004) 128 #define DDCB_PURGE_BE32 cpu_to_be32(0x00000002) 129 #define DDCB_NEXT_BE32 cpu_to_be32(0x00000001) 130 #define DDCB_COMPLETED_BE32 cpu_to_be32(0x00004000) 131 #define DDCB_FETCHED_BE32 cpu_to_be32(0x00000400) 132 133 /* Definitions of DDCB presets */ 134 #define DDCB_PRESET_PRE 0x80 135 #define ICRC_LENGTH(n) ((n) + 8 + 8 + 8) /* used ASIV + hdr fields */ 136 #define VCRC_LENGTH(n) ((n)) /* used ASV */ 137 138 /* 139 * Genwqe Scatter Gather list 140 * Each element has up to 8 entries. 141 * The chaining element is element 0 cause of prefetching needs. 142 */ 143 144 /* 145 * 0b0110 Chained descriptor. The descriptor is describing the next 146 * descriptor list. 147 */ 148 #define SG_CHAINED (0x6) 149 150 /* 151 * 0b0010 First entry of a descriptor list. Start from a Buffer-Empty 152 * condition. 153 */ 154 #define SG_DATA (0x2) 155 156 /* 157 * 0b0000 Early terminator. This is the last entry on the list 158 * irregardless of the length indicated. 159 */ 160 #define SG_END_LIST (0x0) 161 162 /** 163 * struct sglist - Scatter gather list 164 * @target_addr: Either a dma addr of memory to work on or a 165 * dma addr or a subsequent sglist block. 166 * @len: Length of the data block. 167 * @flags: See above. 168 * 169 * Depending on the command the GenWQE card can use a scatter gather 170 * list to describe the memory it works on. Always 8 sg_entry's form 171 * a block. 172 */ 173 struct sg_entry { 174 __be64 target_addr; 175 __be32 len; 176 __be32 flags; 177 }; 178 179 #endif /* __CARD_DDCB_H__ */ 180