jt_cp15_966.c File Reference

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include "dbg_msg.h"
#include "jt_arm.h"
#include "jt_cp15.h"
#include "jt_instr.h"

Functions

• unsigned int jtag_arm966_CP15RegRead (int nreg, int op2, int op1)
• void jtag_arm966_CP15RegWrite (int nreg, int op2, int op1, unsigned int regdata)
• unsigned int jtag_arm966_CP15_ReadTCMcontrolReg (void)
• void jtag_arm966_CP15_WriteTCMcontrolReg (uint32_t val)
• unsigned int jtag_arm966_CP15_ReadFCSEpidReg (void)

---

Detailed Description

ARM966 CP15 Interface

---

Function Documentation

unsigned int jtag_arm966_CP15RegRead	(	int	nreg,
		int	op2,
		int	op1
	)

Read from "physical" CP15 Register.
Some of the CP15 Registers having an direct access like

• IDCODE
• TCMCONTROL
• FCSE PID

 chain 15 the length is 39 bits
 Physical access mode to CP15

 bit [0..31]: register value
 bit [32]:	Opcode 2 (bit 0)
 bit [33.36]: register address (cn0 .. cn15)
 bit [37]:	Opcode 1 (bit 0)
 bit [38]:	0 -> read / 1 -> write
 

Parameters:

	nreg	register address number
	op2	bit 0 part of op code 2
	op1	bit 0 part of op code 1

Returns:

register value

References DBG_LEVEL_JTAG_ICERT_LOW, dbgPrintf(), instr_intest, INTEST, jtag_arm_set_chain(), jtag_exchange_data(), jtag_send_instr(), jtag_supp_bitstr2int_MSB_First(), jtag_supp_int2bitstr_MSB_First(), and scan_chain.

Referenced by jtag_arm966_CP15_ReadFCSEpidReg(), and jtag_arm966_CP15_ReadTCMcontrolReg().

void jtag_arm966_CP15RegWrite	(	int	nreg,
		int	op2,
		int	op1,
		unsigned int	regdata
	)

Write to "physical" CP15 Register.
Some of the CP15 Registers having an direct access like

• IDCODE
• TCMCONTROL
• FCSE PID

 chain 15 the length is 39 bits
 Physical access mode to CP15

 bit [0..31]: register value
 bit [32]:	Opcode 2 (bit 0)
 bit [33.36]: register address (cn0 .. cn15)
 bit [37]:	Opcode 1 (bit 0)
 bit [38]:	0 -> read / 1 -> write
 

Parameters:

	nreg	register address number
	op2	bit 0 part of op code 2
	op1	bit 0 part of op code 1
	regdata	register value

Returns:

-

References DBG_LEVEL_JTAG_ICERT_LOW, DBG_LEVEL_JTAG_INSTR, dbgPrintf(), IF_DBG, instr_intest, INTEST, jtag_arm_set_chain(), jtag_exchange_data(), jtag_send_instr(), jtag_supp_int2bitstr_MSB_First(), and scan_chain.

Referenced by jtag_arm966_CP15_WriteTCMcontrolReg().

unsigned int jtag_arm966_CP15_ReadTCMcontrolReg

(

void

)

read TCM control

 MRC{cond} p15,<Opcode_1>,<Rd>,<CRn>,<CRm>,<Opcode_2>

 ENABLE_ITCM			1<<12
 ENABLE_DTCM			1<<2
 ENABLE_AHB_WRITE_BUFFER	1<<3

 Read TCM contol		MRC p15,0,<Rd>,c1,c0,0
 cn=1, cm=0, op1=0, op2=0	
 

Parameters:

-

Returns:

TCM control register value

References DBG_LEVEL_JTAG_ICERT_LOW, dbgPrintf(), and jtag_arm966_CP15RegRead().

Referenced by jtag_test().

void jtag_arm966_CP15_WriteTCMcontrolReg

(

uint32_t

val

)

write TCM control

 Writed TCM contol		MCR p15,0,<Rd>,c1,c0,0
 cn=1, cm=0, op1=0, op2=0	
 

Parameters:

val

TCM control register value

Returns:

-

References DBG_LEVEL_JTAG_ICERT_LOW, DBG_LEVEL_JTAG_INSTR, dbgPrintf(), IF_DBG, and jtag_arm966_CP15RegWrite().

Referenced by jtag_test().

unsigned int jtag_arm966_CP15_ReadFCSEpidReg

(

void

)

read FCSE ID Register

 Read FCSE PID		MRC p15,0,<Rd>,c13,c0,0
 cn=13, cm=0, op1=0, op2=0	
 

Parameters:

-

Returns:

FCSE PID

References DBG_LEVEL_JTAG_ICERT_LOW, dbgPrintf(), and jtag_arm966_CP15RegRead().