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Diffstat (limited to 'arch/powerpc/include/asm/icswx.h')
| -rw-r--r-- | arch/powerpc/include/asm/icswx.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/icswx.h b/arch/powerpc/include/asm/icswx.h new file mode 100644 index 000000000..9f8402b35 --- /dev/null +++ b/arch/powerpc/include/asm/icswx.h @@ -0,0 +1,184 @@ +/* + * ICSWX api + * + * Copyright (C) 2015 IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * 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_TRANSPORT (20) +#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) + +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_ */ |