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/* Calypso DBB internal TSP (Time Serial Port) Driver */
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <stdio.h>
#include <debug.h>
#include <memory.h>
#include <calypso/tpu.h>
#include <calypso/tsp.h>
static uint16_t tspact_state;
/* initiate a TSP write through the TPU */
void tsp_write(uint8_t dev_idx, uint8_t bitlen, uint32_t dout)
{
if (bitlen <= 8) {
tpu_enq_move(TPUI_TX_1, dout & 0xff);
} else if (bitlen <= 16) {
tpu_enq_move(TPUI_TX_1, (dout >> 8) & 0xff);
tpu_enq_move(TPUI_TX_2, dout & 0xff);
} else if (bitlen <= 24) {
tpu_enq_move(TPUI_TX_1, (dout >> 16) & 0xff);
tpu_enq_move(TPUI_TX_2, (dout >> 8) & 0xff);
tpu_enq_move(TPUI_TX_3, dout & 0xff);
} else {
tpu_enq_move(TPUI_TX_1, (dout >> 24) & 0xff);
tpu_enq_move(TPUI_TX_2, (dout >> 16) & 0xff);
tpu_enq_move(TPUI_TX_3, (dout >> 8) & 0xff);
tpu_enq_move(TPUI_TX_4, dout & 0xff);
}
tpu_enq_move(TPUI_TSP_CTRL1, (dev_idx << 5) | (bitlen - 1));
tpu_enq_move(TPUI_TSP_CTRL2, TPUI_CTRL2_WR);
}
/* Configure clock edge and chip enable polarity for a device */
void tsp_setup(uint8_t dev_idx, int clk_rising, int en_positive, int en_edge)
{
uint8_t reg = TPUI_TSP_SET1 + (dev_idx / 2);
uint8_t val = 0;
uint8_t shift;
if (dev_idx & 1)
shift = 4;
else
shift = 0;
if (clk_rising)
val |= 1;
if (en_positive)
val |= 2;
if (en_edge)
val |= 4;
tpu_enq_move(reg, (val << shift));
}
/* Update the TSPACT state, including enable and disable */
void tsp_act_update(uint16_t new_act)
{
uint8_t low = new_act & 0xff;
uint8_t high = new_act >> 8;
if (low != (tspact_state & 0xff))
tpu_enq_move(TPUI_TSP_ACT_L, low);
if (high != (tspact_state >> 8))
tpu_enq_move(TPUI_TSP_ACT_U, high);
tspact_state = new_act;
}
/* Enable one or multiple TSPACT signals */
void tsp_act_enable(uint16_t bitmask)
{
uint16_t new_act = tspact_state | bitmask;
tsp_act_update(new_act);
}
/* Disable one or multiple TSPACT signals */
void tsp_act_disable(uint16_t bitmask)
{
uint16_t new_act = tspact_state & ~bitmask;
tsp_act_update(new_act);
}
/* Obtain the current tspact state */
uint16_t tsp_act_state(void)
{
return tspact_state;
}
/* Toggle one or multiple TSPACT signals */
void tsp_act_toggle(uint16_t bitmask)
{
uint16_t new_act = tspact_state ^ bitmask;
tsp_act_update(new_act);
}
void tsp_init(void)
{
tsp_act_update(0);
}
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