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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* ICSWX api
*
* Copyright (C) 2015 IBM Corp.
*
* This provides the Initiate Coprocessor Store Word Indexed (ICSWX)
* instruction. This instruction is used to communicate with PowerPC
* coprocessors. This also provides definitions of the structures used
* to communicate with the coprocessor.
*
* The RFC02130: Coprocessor Architecture document is the reference for
* everything in this file unless otherwise noted.
*/
#ifndef _ARCH_POWERPC_INCLUDE_ASM_ICSWX_H_
#define _ARCH_POWERPC_INCLUDE_ASM_ICSWX_H_
#include <asm/ppc-opcode.h> /* for PPC_ICSWX */
/* Chapter 6.5.8 Coprocessor-Completion Block (CCB) */
#define CCB_VALUE (0x3fffffffffffffff)
#define CCB_ADDRESS (0xfffffffffffffff8)
#define CCB_CM (0x0000000000000007)
#define CCB_CM0 (0x0000000000000004)
#define CCB_CM12 (0x0000000000000003)
#define CCB_CM0_ALL_COMPLETIONS (0x0)
#define CCB_CM0_LAST_IN_CHAIN (0x4)
#define CCB_CM12_STORE (0x0)
#define CCB_CM12_INTERRUPT (0x1)
#define CCB_SIZE (0x10)
#define CCB_ALIGN CCB_SIZE
struct coprocessor_completion_block {
__be64 value;
__be64 address;
} __packed __aligned(CCB_ALIGN);
/* Chapter 6.5.7 Coprocessor-Status Block (CSB) */
#define CSB_V (0x80)
#define CSB_F (0x04)
#define CSB_CH (0x03)
#define CSB_CE_INCOMPLETE (0x80)
#define CSB_CE_TERMINATION (0x40)
#define CSB_CE_TPBC (0x20)
#define CSB_CC_SUCCESS (0)
#define CSB_CC_INVALID_ALIGN (1)
#define CSB_CC_OPERAND_OVERLAP (2)
#define CSB_CC_DATA_LENGTH (3)
#define CSB_CC_TRANSLATION (5)
#define CSB_CC_PROTECTION (6)
#define CSB_CC_RD_EXTERNAL (7)
#define CSB_CC_INVALID_OPERAND (8)
#define CSB_CC_PRIVILEGE (9)
#define CSB_CC_INTERNAL (10)
#define CSB_CC_WR_EXTERNAL (12)
#define CSB_CC_NOSPC (13)
#define CSB_CC_EXCESSIVE_DDE (14)
#define CSB_CC_WR_TRANSLATION (15)
#define CSB_CC_WR_PROTECTION (16)
#define CSB_CC_UNKNOWN_CODE (17)
#define CSB_CC_ABORT (18)
#define CSB_CC_EXCEED_BYTE_COUNT (19) /* P9 or later */
#define CSB_CC_TRANSPORT (20)
#define CSB_CC_INVALID_CRB (21) /* P9 or later */
#define CSB_CC_INVALID_DDE (30) /* P9 or later */
#define CSB_CC_SEGMENTED_DDL (31)
#define CSB_CC_PROGRESS_POINT (32)
#define CSB_CC_DDE_OVERFLOW (33)
#define CSB_CC_SESSION (34)
#define CSB_CC_PROVISION (36)
#define CSB_CC_CHAIN (37)
#define CSB_CC_SEQUENCE (38)
#define CSB_CC_HW (39)
#define CSB_SIZE (0x10)
#define CSB_ALIGN CSB_SIZE
struct coprocessor_status_block {
u8 flags;
u8 cs;
u8 cc;
u8 ce;
__be32 count;
__be64 address;
} __packed __aligned(CSB_ALIGN);
/* Chapter 6.5.10 Data-Descriptor List (DDL)
* each list contains one or more Data-Descriptor Entries (DDE)
*/
#define DDE_P (0x8000)
#define DDE_SIZE (0x10)
#define DDE_ALIGN DDE_SIZE
struct data_descriptor_entry {
__be16 flags;
u8 count;
u8 index;
__be32 length;
__be64 address;
} __packed __aligned(DDE_ALIGN);
/* Chapter 6.5.2 Coprocessor-Request Block (CRB) */
#define CRB_SIZE (0x80)
#define CRB_ALIGN (0x100) /* Errata: requires 256 alignment */
/* Coprocessor Status Block field
* ADDRESS address of CSB
* C CCB is valid
* AT 0 = addrs are virtual, 1 = addrs are phys
* M enable perf monitor
*/
#define CRB_CSB_ADDRESS (0xfffffffffffffff0)
#define CRB_CSB_C (0x0000000000000008)
#define CRB_CSB_AT (0x0000000000000002)
#define CRB_CSB_M (0x0000000000000001)
struct coprocessor_request_block {
__be32 ccw;
__be32 flags;
__be64 csb_addr;
struct data_descriptor_entry source;
struct data_descriptor_entry target;
struct coprocessor_completion_block ccb;
u8 reserved[48];
struct coprocessor_status_block csb;
} __packed __aligned(CRB_ALIGN);
/* RFC02167 Initiate Coprocessor Instructions document
* Chapter 8.2.1.1.1 RS
* Chapter 8.2.3 Coprocessor Directive
* Chapter 8.2.4 Execution
*
* The CCW must be converted to BE before passing to icswx()
*/
#define CCW_PS (0xff000000)
#define CCW_CT (0x00ff0000)
#define CCW_CD (0x0000ffff)
#define CCW_CL (0x0000c000)
/* RFC02167 Initiate Coprocessor Instructions document
* Chapter 8.2.1 Initiate Coprocessor Store Word Indexed (ICSWX)
* Chapter 8.2.4.1 Condition Register 0
*/
#define ICSWX_INITIATED (0x8)
#define ICSWX_BUSY (0x4)
#define ICSWX_REJECTED (0x2)
#define ICSWX_XERS0 (0x1) /* undefined or set from XERSO. */
static inline int icswx(__be32 ccw, struct coprocessor_request_block *crb)
{
__be64 ccw_reg = ccw;
u32 cr;
__asm__ __volatile__(
PPC_ICSWX(%1,0,%2) "\n"
"mfcr %0\n"
: "=r" (cr)
: "r" (ccw_reg), "r" (crb)
: "cr0", "memory");
return (int)((cr >> 28) & 0xf);
}
#endif /* _ARCH_POWERPC_INCLUDE_ASM_ICSWX_H_ */
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