diff options
Diffstat (limited to 'drivers/staging/sbe-2t3e3/exar7300.c')
| -rw-r--r-- | drivers/staging/sbe-2t3e3/exar7300.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/staging/sbe-2t3e3/exar7300.c b/drivers/staging/sbe-2t3e3/exar7300.c new file mode 100644 index 0000000..d10d696 --- /dev/null +++ b/drivers/staging/sbe-2t3e3/exar7300.c @@ -0,0 +1,182 @@ +/* + * 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; + } +} |
