arch/powerpc/include/asm/icswx.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * ICSWX api
   4  *
   5  * Copyright (C) 2015 IBM Corp.
   6  *
   7  * This provides the Initiate Coprocessor Store Word Indexed (ICSWX)
   8  * instruction.  This instruction is used to communicate with PowerPC
   9  * coprocessors.  This also provides definitions of the structures used
  10  * to communicate with the coprocessor.
  11  *
  12  * The RFC02130: Coprocessor Architecture document is the reference for
  13  * everything in this file unless otherwise noted.
  14  */
  15 #ifndef _ARCH_POWERPC_INCLUDE_ASM_ICSWX_H_
  16 #define _ARCH_POWERPC_INCLUDE_ASM_ICSWX_H_
  17
  18 #include <asm/ppc-opcode.h> /* for PPC_ICSWX */
  19
  20 /* Chapter 6.5.8 Coprocessor-Completion Block (CCB) */
  21
  22 #define CCB_VALUE               (0x3fffffffffffffff)
  23 #define CCB_ADDRESS             (0xfffffffffffffff8)
  24 #define CCB_CM                  (0x0000000000000007)
  25 #define CCB_CM0                 (0x0000000000000004)
  26 #define CCB_CM12                (0x0000000000000003)
  27
  28 #define CCB_CM0_ALL_COMPLETIONS (0x0)
  29 #define CCB_CM0_LAST_IN_CHAIN   (0x4)
  30 #define CCB_CM12_STORE          (0x0)
  31 #define CCB_CM12_INTERRUPT      (0x1)
  32
  33 #define CCB_SIZE                (0x10)
  34 #define CCB_ALIGN               CCB_SIZE
  35
  36 struct coprocessor_completion_block {
  37         __be64 value;
  38         __be64 address;
  39 } __packed __aligned(CCB_ALIGN);
  40
  41
  42 /* Chapter 6.5.7 Coprocessor-Status Block (CSB) */
  43
  44 #define CSB_V                   (0x80)
  45 #define CSB_F                   (0x04)
  46 #define CSB_CH                  (0x03)
  47 #define CSB_CE_INCOMPLETE       (0x80)
  48 #define CSB_CE_TERMINATION      (0x40)
  49 #define CSB_CE_TPBC             (0x20)
  50
  51 #define CSB_CC_SUCCESS          (0)
  52 #define CSB_CC_INVALID_ALIGN    (1)
  53 #define CSB_CC_OPERAND_OVERLAP  (2)
  54 #define CSB_CC_DATA_LENGTH      (3)
  55 #define CSB_CC_TRANSLATION      (5)
  56 #define CSB_CC_PROTECTION       (6)
  57 #define CSB_CC_RD_EXTERNAL      (7)
  58 #define CSB_CC_INVALID_OPERAND  (8)
  59 #define CSB_CC_PRIVILEGE        (9)
  60 #define CSB_CC_INTERNAL         (10)
  61 #define CSB_CC_WR_EXTERNAL      (12)
  62 #define CSB_CC_NOSPC            (13)
  63 #define CSB_CC_EXCESSIVE_DDE    (14)
  64 #define CSB_CC_WR_TRANSLATION   (15)
  65 #define CSB_CC_WR_PROTECTION    (16)
  66 #define CSB_CC_UNKNOWN_CODE     (17)
  67 #define CSB_CC_ABORT            (18)
  68 #define CSB_CC_EXCEED_BYTE_COUNT        (19)    /* P9 or later */
  69 #define CSB_CC_TRANSPORT        (20)
  70 #define CSB_CC_INVALID_CRB      (21)    /* P9 or later */
  71 #define CSB_CC_INVALID_DDE      (30)    /* P9 or later */
  72 #define CSB_CC_SEGMENTED_DDL    (31)
  73 #define CSB_CC_PROGRESS_POINT   (32)
  74 #define CSB_CC_DDE_OVERFLOW     (33)
  75 #define CSB_CC_SESSION          (34)
  76 #define CSB_CC_PROVISION        (36)
  77 #define CSB_CC_CHAIN            (37)
  78 #define CSB_CC_SEQUENCE         (38)
  79 #define CSB_CC_HW               (39)
  80
  81 #define CSB_SIZE                (0x10)
  82 #define CSB_ALIGN               CSB_SIZE
  83
  84 struct coprocessor_status_block {
  85         u8 flags;
  86         u8 cs;
  87         u8 cc;
  88         u8 ce;
  89         __be32 count;
  90         __be64 address;
  91 } __packed __aligned(CSB_ALIGN);
  92
  93
  94 /* Chapter 6.5.10 Data-Descriptor List (DDL)
  95  * each list contains one or more Data-Descriptor Entries (DDE)
  96  */
  97
  98 #define DDE_P                   (0x8000)
  99
 100 #define DDE_SIZE                (0x10)
 101 #define DDE_ALIGN               DDE_SIZE
 102
 103 struct data_descriptor_entry {
 104         __be16 flags;
 105         u8 count;
 106         u8 index;
 107         __be32 length;
 108         __be64 address;
 109 } __packed __aligned(DDE_ALIGN);
 110
 111
 112 /* Chapter 6.5.2 Coprocessor-Request Block (CRB) */
 113
 114 #define CRB_SIZE                (0x80)
 115 #define CRB_ALIGN               (0x100) /* Errata: requires 256 alignment */
 116
 117 /* Coprocessor Status Block field
 118  *   ADDRESS    address of CSB
 119  *   C          CCB is valid
 120  *   AT         0 = addrs are virtual, 1 = addrs are phys
 121  *   M          enable perf monitor
 122  */
 123 #define CRB_CSB_ADDRESS         (0xfffffffffffffff0)
 124 #define CRB_CSB_C               (0x0000000000000008)
 125 #define CRB_CSB_AT              (0x0000000000000002)
 126 #define CRB_CSB_M               (0x0000000000000001)
 127
 128 struct coprocessor_request_block {
 129         __be32 ccw;
 130         __be32 flags;
 131         __be64 csb_addr;
 132
 133         struct data_descriptor_entry source;
 134         struct data_descriptor_entry target;
 135
 136         struct coprocessor_completion_block ccb;
 137
 138         u8 reserved[48];
 139
 140         struct coprocessor_status_block csb;
 141 } __packed __aligned(CRB_ALIGN);
 142
 143
 144 /* RFC02167 Initiate Coprocessor Instructions document
 145  * Chapter 8.2.1.1.1 RS
 146  * Chapter 8.2.3 Coprocessor Directive
 147  * Chapter 8.2.4 Execution
 148  *
 149  * The CCW must be converted to BE before passing to icswx()
 150  */
 151
 152 #define CCW_PS                  (0xff000000)
 153 #define CCW_CT                  (0x00ff0000)
 154 #define CCW_CD                  (0x0000ffff)
 155 #define CCW_CL                  (0x0000c000)
 156
 157
 158 /* RFC02167 Initiate Coprocessor Instructions document
 159  * Chapter 8.2.1 Initiate Coprocessor Store Word Indexed (ICSWX)
 160  * Chapter 8.2.4.1 Condition Register 0
 161  */
 162
 163 #define ICSWX_INITIATED         (0x8)
 164 #define ICSWX_BUSY              (0x4)
 165 #define ICSWX_REJECTED          (0x2)
 166 #define ICSWX_XERS0             (0x1)   /* undefined or set from XERSO. */
 167
 168 static inline int icswx(__be32 ccw, struct coprocessor_request_block *crb)
 169 {
 170         __be64 ccw_reg = ccw;
 171         u32 cr;
 172
 173         __asm__ __volatile__(
 174         PPC_ICSWX(%1,0,%2) "\n"
 175         "mfcr %0\n"
 176         : "=r" (cr)
 177         : "r" (ccw_reg), "r" (crb)
 178         : "cr0", "memory");
 179
 180         return (int)((cr >> 28) & 0xf);
 181 }
 182
 183
 184 #endif /* _ARCH_POWERPC_INCLUDE_ASM_ICSWX_H_ */