/drivers/staging/sbe-2t3e3/exar7300.c
C | 182 lines | 145 code | 23 blank | 14 comment | 14 complexity | 8c89b6768c3254683a28e6effbc8cb42 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
- /*
- * SBE 2T3E3 synchronous serial card driver for Linux
- *
- * Copyright (C) 2009-2010 Krzysztof Halasa <khc@pm.waw.pl>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License
- * as published by the Free Software Foundation.
- *
- * This code is based on a driver written by SBE Inc.
- */
- #include "2t3e3.h"
- #include "ctrl.h"
- void exar7300_init(struct channel *sc)
- {
- exar7300_write(sc, SBE_2T3E3_LIU_REG_REG1, 0);
- /* enable line decodeer and encoder */
- exar7300_write(sc, SBE_2T3E3_LIU_REG_REG2, 0);
- exar7300_write(sc, SBE_2T3E3_LIU_REG_REG3, 0);
- exar7300_write(sc, SBE_2T3E3_LIU_REG_REG4,
- SBE_2T3E3_LIU_VAL_T3_MODE_SELECT |
- SBE_2T3E3_LIU_VAL_LOOPBACK_OFF);
- }
- void exar7300_set_loopback(struct channel *sc, u32 mode)
- {
- u32 val;
- switch (mode) {
- case SBE_2T3E3_LIU_VAL_LOOPBACK_OFF:
- case SBE_2T3E3_LIU_VAL_LOOPBACK_REMOTE:
- case SBE_2T3E3_LIU_VAL_LOOPBACK_ANALOG:
- case SBE_2T3E3_LIU_VAL_LOOPBACK_DIGITAL:
- break;
- default:
- return;
- }
- val = exar7300_read(sc, SBE_2T3E3_LIU_REG_REG4);
- val &= ~(SBE_2T3E3_LIU_VAL_LOCAL_LOOPBACK | SBE_2T3E3_LIU_VAL_REMOTE_LOOPBACK);
- val |= mode;
- exar7300_write(sc, SBE_2T3E3_LIU_REG_REG4, val);
- #if 0
- /* TODO - is it necessary? idea from 2T3E3_HW_Test_code */
- switch (mode) {
- case SBE_2T3E3_LIU_VAL_LOOPBACK_OFF:
- break;
- case SBE_2T3E3_LIU_VAL_LOOPBACK_REMOTE:
- exar7300_receive_equalization_onoff(sc, SBE_2T3E3_ON);
- break;
- case SBE_2T3E3_LIU_VAL_LOOPBACK_ANALOG:
- exar7300_receive_equalization_onoff(sc, SBE_2T3E3_OFF);
- break;
- case SBE_2T3E3_LIU_VAL_LOOPBACK_DIGITAL:
- exar7300_receive_equalization_onoff(sc, SBE_2T3E3_ON);
- break;
- }
- #endif
- }
- void exar7300_set_frame_type(struct channel *sc, u32 type)
- {
- u32 val;
- switch (type) {
- case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
- case SBE_2T3E3_FRAME_TYPE_T3_M13:
- case SBE_2T3E3_FRAME_TYPE_E3_G751:
- case SBE_2T3E3_FRAME_TYPE_E3_G832:
- break;
- default:
- return;
- }
- val = exar7300_read(sc, SBE_2T3E3_LIU_REG_REG4);
- val &= ~(SBE_2T3E3_LIU_VAL_T3_MODE_SELECT |
- SBE_2T3E3_LIU_VAL_E3_MODE_SELECT);
- switch (type) {
- case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
- case SBE_2T3E3_FRAME_TYPE_T3_M13:
- val |= SBE_2T3E3_LIU_VAL_T3_MODE_SELECT;
- break;
- case SBE_2T3E3_FRAME_TYPE_E3_G751:
- case SBE_2T3E3_FRAME_TYPE_E3_G832:
- val |= SBE_2T3E3_LIU_VAL_E3_MODE_SELECT;
- break;
- default:
- return;
- }
- exar7300_write(sc, SBE_2T3E3_LIU_REG_REG4, val);
- }
- void exar7300_transmit_all_ones_onoff(struct channel *sc, u32 mode)
- {
- if (sc->p.transmit_all_ones == mode)
- return;
- switch (mode) {
- case SBE_2T3E3_ON:
- exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG1,
- SBE_2T3E3_LIU_VAL_TRANSMIT_ALL_ONES);
- break;
- case SBE_2T3E3_OFF:
- exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG1,
- SBE_2T3E3_LIU_VAL_TRANSMIT_ALL_ONES);
- break;
- default:
- return;
- }
- sc->p.transmit_all_ones = mode;
- }
- void exar7300_receive_equalization_onoff(struct channel *sc, u32 mode)
- {
- if (sc->p.receive_equalization == mode)
- return;
- switch (mode) {
- case SBE_2T3E3_OFF:
- exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG2,
- SBE_2T3E3_LIU_VAL_RECEIVE_EQUALIZATION_DISABLE);
- break;
- case SBE_2T3E3_ON:
- exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG2,
- SBE_2T3E3_LIU_VAL_RECEIVE_EQUALIZATION_DISABLE);
- break;
- default:
- return;
- }
- sc->p.receive_equalization = mode;
- }
- void exar7300_line_build_out_onoff(struct channel *sc, u32 mode)
- {
- if (sc->p.line_build_out == mode)
- return;
- switch (mode) {
- case SBE_2T3E3_OFF:
- exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG1,
- SBE_2T3E3_LIU_VAL_TRANSMIT_LEVEL_SELECT);
- exar7300_receive_equalization_onoff(sc, SBE_2T3E3_OFF);
- break;
- case SBE_2T3E3_ON:
- exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG1,
- SBE_2T3E3_LIU_VAL_TRANSMIT_LEVEL_SELECT);
- exar7300_receive_equalization_onoff(sc, SBE_2T3E3_ON);
- break;
- default:
- return;
- }
- sc->p.line_build_out = mode;
- }
- /* TODO - what about encoder in raw mode??? disable it too? */
- void exar7300_unipolar_onoff(struct channel *sc, u32 mode)
- {
- switch (mode) {
- case SBE_2T3E3_OFF:
- exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG3,
- SBE_2T3E3_LIU_VAL_DECODER_DISABLE);
- exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG1,
- SBE_2T3E3_LIU_VAL_TRANSMIT_BINARY_DATA);
- break;
- case SBE_2T3E3_ON:
- exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG3,
- SBE_2T3E3_LIU_VAL_DECODER_DISABLE);
- exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG1,
- SBE_2T3E3_LIU_VAL_TRANSMIT_BINARY_DATA);
- break;
- }
- }