/* jtag.c -- JTAG modeling
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/* jtag.c -- JTAG modeling
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Copyright (C) 2010 Embecosm Limited
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Copyright (C) 2010 Embecosm Limited
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Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify it
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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under the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your option)
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Software Foundation; either version 3 of the License, or (at your option)
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any later version.
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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more details.
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You should have received a copy of the GNU General Public License along
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>. */
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with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This program is commented throughout in a fashion suitable for processing
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/* This program is commented throughout in a fashion suitable for processing
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with Doxygen. */
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with Doxygen. */
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#ifndef JTAG__H
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#ifndef JTAG__H
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#define JTAG__H
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#define JTAG__H
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/*! Enumeration of the JTAG instruction types */
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/*! Enumeration of the JTAG instruction types */
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enum jtag_instr {
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enum jtag_instr {
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JI_UNDEFINED = -1, /* Won't fit in bitfield */
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JI_UNDEFINED = -1, /* Won't fit in bitfield */
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JI_EXTEST = 0x0,
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JI_EXTEST = 0x0,
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JI_SAMPLE_PRELOAD = 0x1,
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JI_SAMPLE_PRELOAD = 0x1,
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JI_IDCODE = 0x2,
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JI_IDCODE = 0x2,
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JI_DEBUG = 0x8,
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JI_DEBUG = 0x8,
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JI_MBIST = 0x9,
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JI_MBIST = 0x9,
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JI_BYPASS = 0xf
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JI_BYPASS = 0xf
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};
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};
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/*! Enumeration of the JTAG module IDs */
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/*! Enumeration of the JTAG module IDs */
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enum jtag_mod_id {
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enum jtag_mod_id {
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JM_UNDEFINED = -1, /* Won't fit in bitfield */
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JM_UNDEFINED = -1, /* Won't fit in bitfield */
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JM_WISHBONE = 0x0,
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JM_WISHBONE = 0x0,
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JM_CPU0 = 0x1,
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JM_CPU0 = 0x1,
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JM_CPU1 = 0x2
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JM_CPU1 = 0x2
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};
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};
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/*! Enumeration of the DEBUG command types */
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/*! Enumeration of the DEBUG command types */
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enum jtag_cmd {
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enum jtag_cmd {
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JCMD_UNDEFINED = -1, /* Won't fit in bitfield */
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JCMD_UNDEFINED = -1, /* Won't fit in bitfield */
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JCMD_GO_COMMAND = 0x0,
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JCMD_GO_COMMAND = 0x0,
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JCMD_READ_COMMAND = 0x1,
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JCMD_READ_COMMAND = 0x1,
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JCMD_WRITE_COMMAND = 0x2,
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JCMD_WRITE_COMMAND = 0x2,
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JCMD_READ_CONTROL = 0x3,
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JCMD_READ_CONTROL = 0x3,
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JCMD_WRITE_CONTROL = 0x4
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JCMD_WRITE_CONTROL = 0x4
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};
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};
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/*! Enumeration of the access types for WRITE_COMMAND */
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/*! Enumeration of the access types for WRITE_COMMAND */
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enum jtag_acc_type {
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enum jtag_acc_type {
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JAT_UNDEFINED = -1, /* Won't fit in bitfield */
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JAT_UNDEFINED = -1, /* Won't fit in bitfield */
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JAT_WRITE8 = 0, /* WishBone only */
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JAT_WRITE8 = 0, /* WishBone only */
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JAT_WRITE16 = 1, /* WishBone only */
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JAT_WRITE16 = 1, /* WishBone only */
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JAT_WRITE32 = 2,
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JAT_WRITE32 = 2,
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JAT_READ8 = 4, /* WishBone only */
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JAT_READ8 = 4, /* WishBone only */
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JAT_READ16 = 5, /* WishBone only */
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JAT_READ16 = 5, /* WishBone only */
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JAT_READ32 = 6
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JAT_READ32 = 6
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};
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};
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/*! Enumeration of the status field bits */
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/*! Enumeration of the status field bits */
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enum jtag_status {
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enum jtag_status {
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JS_OK = 0x0, /*!< No error */
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JS_OK = 0x0, /*!< No error */
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JS_CRC_IN_ERROR = 0x1, /*!< Supplied CRC error */
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JS_CRC_IN_ERROR = 0x1, /*!< Supplied CRC error */
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JS_MODULE_MISSING = 0x2, /*!< Non-existent module select */
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JS_MODULE_MISSING = 0x2, /*!< Non-existent module select */
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JS_WISHBONE_ERROR = 0x4, /*!< Problem accessing Wishgone */
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JS_WISHBONE_ERROR = 0x4, /*!< Problem accessing Wishgone */
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JS_OVER_UNDERRUN = 0x8 /*!< Over/under-run of data */
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JS_OVER_UNDERRUN = 0x8 /*!< Over/under-run of data */
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};
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};
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/*! Enumeration of the control bits */
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/*! Enumeration of the control bits */
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enum jtag_control_bits {
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enum jtag_control_bits {
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JCB_RESET = 51, /*!< Reset the processor */
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JCB_RESET = 51, /*!< Reset the processor */
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JCB_STALL = 50, /*!< Stall the processor */
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JCB_STALL = 50, /*!< Stall the processor */
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};
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};
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/* Function prototypes for external use */
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/* Function prototypes for external use */
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extern void jtag_init ();
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extern void jtag_init ();
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extern void jtag_reset ();
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extern void jtag_reset ();
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extern void jtag_shift_ir (unsigned char *jreg,
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extern void jtag_shift_ir (unsigned char *jreg,
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int num_bits);
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int num_bits);
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extern void jtag_shift_dr (unsigned char *jreg,
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extern void jtag_shift_dr (unsigned char *jreg,
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int num_bits);
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int num_bits);
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#endif /* JTAG__H */
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#endif /* JTAG__H */
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