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/***************************************************************************
* Copyright (C) 2007-2008 by Øyvind Harboe *
* *
* 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 program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <cyg/hal/hal_io.h> // low level i/o
//#define VERBOSE(a) a
#define VERBOSE(a)
/* used to test manual mode */
#define TEST_MANUAL() 0
#if 0
int diag_printf( const char *fmt, ... );
#define ZY1000_POKE(a, b) HAL_WRITE_UINT32(a, b); diag_printf("poke 0x%08x,0x%08x\n", a, b)
#define ZY1000_PEEK(a, b) HAL_READ_UINT32(a, b); diag_printf("peek 0x%08x = 0x%08x\n", a, b)
#else
#define ZY1000_POKE(a, b) HAL_WRITE_UINT32(a, b)
#define ZY1000_PEEK(a, b) HAL_READ_UINT32(a, b)
#endif
// FIFO empty?
static __inline__ void waitIdle(void)
{
cyg_uint32 empty;
do
{
ZY1000_PEEK(ZY1000_JTAG_BASE + 0x10, empty);
} while ((empty & 0x100) == 0);
}
static __inline__ void waitQueue(void)
{
// waitIdle();
}
static void sampleShiftRegister(void)
{
#if 0
cyg_uint32 dummy;
waitIdle();
ZY1000_PEEK(ZY1000_JTAG_BASE + 0xc, dummy);
#endif
}
/* -O3 will inline this for us */
static void setCurrentState(enum tap_state state)
{
cyg_uint32 a;
a = state;
int repeat = 0;
if (state == TAP_RESET)
{
// The FPGA nor we know the current state of the CPU TAP
// controller. This will move it to TAP for sure.
//
// 5 should be enough here, 7 is what OpenOCD uses
repeat = 7;
}
waitQueue();
sampleShiftRegister();
ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (repeat << 8) | (a << 4) | a);
}
/*
* Enter state and cause repeat transitions *out* of that state. So if the endState != state, then
* the transition from state to endState counts as a transition out of state.
*/
static __inline__ void shiftValueInner(const enum tap_state state, const enum tap_state endState, int repeat, cyg_uint32 value)
{
cyg_uint32 a,b;
a = state;
b = endState;
waitQueue();
sampleShiftRegister();
ZY1000_POKE(ZY1000_JTAG_BASE + 0xc, value);
#if 1
#if TEST_MANUAL()
if ((state == TAP_DRSHIFT) && (endState != TAP_DRSHIFT))
{
int i;
setCurrentState(state);
for (i = 0; i < repeat; i++)
{
int tms;
tms = 0;
if ((i == repeat-1) && (state != endState))
{
tms = 1;
}
/* shift out value */
waitIdle();
ZY1000_POKE(ZY1000_JTAG_BASE + 0x28, (((value >> i)&1) << 1) | tms);
}
waitIdle();
ZY1000_POKE(ZY1000_JTAG_BASE + 0x28, 0);
waitIdle();
//ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, TAP_DRSHIFT); // set this state and things break => expected
ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, TAP_DRPAUSE); // set this and things will work => expected. Not setting this is not sufficient to make things break.
setCurrentState(endState);
} else
{
ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (repeat << 8) | (a << 4) | b);
}
#else
/* fast version */
ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (repeat << 8) | (a << 4) | b);
#endif
#else
/* maximum debug version */
if ((repeat > 0) && ((state == TAP_DRSHIFT)||(state == TAP_SI)))
{
int i;
/* sample shift register for every bit. */
for (i = 0; i < repeat-1; i++)
{
sampleShiftRegister();
ZY1000_POKE(ZY1000_JTAG_BASE + 0xc, value >> i);
ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (1 << 8) | (a << 4) | a);
}
sampleShiftRegister();
ZY1000_POKE(ZY1000_JTAG_BASE + 0xc, value >> (repeat-1));
ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (1 << 8) | (a << 4) | b);
} else
{
sampleShiftRegister();
ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (repeat << 8) | (a << 4) | b);
}
sampleShiftRegister();
#endif
}
static __inline__ void interface_jtag_add_dr_out_core(jtag_tap_t *target_tap,
int num_fields,
const int *num_bits,
const uint32_t *value,
enum tap_state end_state)
{
enum tap_state pause_state = TAP_DRSHIFT;
jtag_tap_t *tap, *nextTap;
for (tap = jtag_tap_next_enabled(NULL); tap!= NULL; tap = nextTap)
{
nextTap = jtag_tap_next_enabled(tap);
if (nextTap == NULL)
{
pause_state = end_state;
}
if (tap == target_tap)
{
int j;
for (j = 0; j < (num_fields-1); j++)
{
shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, num_bits[j], value[j]);
}
shiftValueInner(TAP_DRSHIFT, pause_state, num_bits[j], value[j]);
} else
{
/* program the scan field to 1 bit length, and ignore it's value */
shiftValueInner(TAP_DRSHIFT, pause_state, 1, 0);
}
}
}
static __inline__ void interface_jtag_add_dr_out(jtag_tap_t *target_tap,
int num_fields,
const int *num_bits,
const uint32_t *value,
enum tap_state end_state)
{
int singletap = (jtag_tap_next_enabled(jtag_tap_next_enabled(NULL)) == NULL);
if ((singletap) && (num_fields == 3))
{
/* used by embeddedice_write_reg_inner() */
shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, num_bits[0], value[0]);
shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, num_bits[1], value[1]);
shiftValueInner(TAP_DRSHIFT, end_state, num_bits[2], value[2]);
} else if ((singletap) && (num_fields == 2))
{
/* used by arm7 code */
shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, num_bits[0], value[0]);
shiftValueInner(TAP_DRSHIFT, end_state, num_bits[1], value[1]);
} else
{
interface_jtag_add_dr_out_core(target_tap, num_fields, num_bits, value, end_state);
}
}
#define interface_jtag_add_callback(callback, in) callback(in)
#define interface_jtag_add_callback4(callback, in, data1, data2, data3) jtag_set_error(callback(in, data1, data2, data3))
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