118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/* Calypso DBB internal TSP (Time Serial Port) Driver */
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/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <debug.h>
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#include <memory.h>
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#include <calypso/tpu.h>
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#include <calypso/tsp.h>
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static uint16_t tspact_state;
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/* initiate a TSP write through the TPU */
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void tsp_write(uint8_t dev_idx, uint8_t bitlen, uint32_t dout)
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{
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if (bitlen <= 8) {
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tpu_enq_move(TPUI_TX_1, dout & 0xff);
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} else if (bitlen <= 16) {
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tpu_enq_move(TPUI_TX_1, (dout >> 8) & 0xff);
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tpu_enq_move(TPUI_TX_2, dout & 0xff);
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} else if (bitlen <= 24) {
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tpu_enq_move(TPUI_TX_1, (dout >> 16) & 0xff);
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tpu_enq_move(TPUI_TX_2, (dout >> 8) & 0xff);
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tpu_enq_move(TPUI_TX_3, dout & 0xff);
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} else {
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tpu_enq_move(TPUI_TX_1, (dout >> 24) & 0xff);
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tpu_enq_move(TPUI_TX_2, (dout >> 16) & 0xff);
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tpu_enq_move(TPUI_TX_3, (dout >> 8) & 0xff);
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tpu_enq_move(TPUI_TX_4, dout & 0xff);
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}
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tpu_enq_move(TPUI_TSP_CTRL1, (dev_idx << 5) | (bitlen - 1));
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tpu_enq_move(TPUI_TSP_CTRL2, TPUI_CTRL2_WR);
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}
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/* Configure clock edge and chip enable polarity for a device */
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void tsp_setup(uint8_t dev_idx, int clk_rising, int en_positive, int en_edge)
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{
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uint8_t reg = TPUI_TSP_SET1 + (dev_idx / 2);
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uint8_t val = 0;
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uint8_t shift;
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if (dev_idx & 1)
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shift = 4;
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else
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shift = 0;
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if (clk_rising)
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val |= 1;
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if (en_positive)
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val |= 2;
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if (en_edge)
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val |= 4;
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tpu_enq_move(reg, (val << shift));
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}
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/* Update the TSPACT state, including enable and disable */
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void tsp_act_update(uint16_t new_act)
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{
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uint8_t low = new_act & 0xff;
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uint8_t high = new_act >> 8;
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if (low != (tspact_state & 0xff))
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tpu_enq_move(TPUI_TSP_ACT_L, low);
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if (high != (tspact_state >> 8))
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tpu_enq_move(TPUI_TSP_ACT_U, high);
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tspact_state = new_act;
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}
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/* Enable one or multiple TSPACT signals */
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void tsp_act_enable(uint16_t bitmask)
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{
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uint16_t new_act = tspact_state | bitmask;
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tsp_act_update(new_act);
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}
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/* Disable one or multiple TSPACT signals */
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void tsp_act_disable(uint16_t bitmask)
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{
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uint16_t new_act = tspact_state & ~bitmask;
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tsp_act_update(new_act);
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}
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/* Obtain the current tspact state */
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uint16_t tsp_act_state(void)
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{
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return tspact_state;
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}
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/* Toggle one or multiple TSPACT signals */
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void tsp_act_toggle(uint16_t bitmask)
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{
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uint16_t new_act = tspact_state ^ bitmask;
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tsp_act_update(new_act);
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}
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void tsp_init(void)
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{
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tsp_act_update(0);
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}
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