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#include <stdint.h>
#include <stdio.h>
#include <debug.h>
#include <memory.h>
#include <rffe.h>
#include <calypso/tsp.h>
#include <rf/trf6151.h>
/* This is a value that has been measured on the C123 by Harald: 71dBm,
it is the difference between the input level at the antenna and what
the DSP reports, subtracted by the total gain of the TRF6151 */
#define SYSTEM_INHERENT_GAIN 71
/* describe how the RF frontend is wired on the Motorola E86 board (C139/C140) */
#define RITA_RESET TSPACT(0) /* Reset of the Rita TRF6151 */
#define PA_ENABLE TSPACT(1) /* Enable the Power Amplifier */
#define DCS_TX TSPACT(6) /* DCS Transmit Enable */
#define GSM_TX1 TSPACT(8) /* GSM Transmit Enable 1 */
/* in order to save a transistor, the E86 has a second signal for GSM TX */
#define GSM_TX2 TSPACT(2) /* GSM Transmit Enable 2 */
#define IOTA_STROBE TSPEN(0) /* Strobe for the Iota TSP */
#define RITA_STROBE TSPEN(2) /* Strobe for the Rita TSP */
/* switch RF Frontend Mode */
void rffe_mode(enum gsm_band band, int tx)
{
uint16_t tspact = tsp_act_state();
/* First we mask off all bits from the state cache */
tspact &= ~(PA_ENABLE);
tspact |= DCS_TX | GSM_TX1 | GSM_TX2; /* low-active */
#ifdef CONFIG_TX_ENABLE
/* Then we selectively set the bits on, if required */
if (tx) {
if (band == GSM_BAND_850 || band == GSM_BAND_900)
tspact &= ~(GSM_TX1 | GSM_TX2);
else
tspact &= ~DCS_TX;
tspact |= PA_ENABLE;
}
#endif /* TRANSMIT_SUPPORT */
tsp_act_update(tspact);
}
/*
* Each given Mot C1xx phone is made either for 900+1800 MHz, in which
* case only the DCS Rx port is connected, or for 850+1900 MHz, in which
* case only the PCS Rx port is connected. Here we tell the TRF6151 driver
* that both DCS and PCS ports are connected, so that the same binary
* build can be used on both EU-band and US-band C1xx phones.
*
* If you are using your phone the way it was meant to be used, i.e.,
* listening to EGSM and DCS downlinks only with EU-band phones or
* listening to GSM850 and PCS downlinks only with US-band phones, then
* the same standard binary build will work on both: the TRF6151 driver
* will use the DCS Rx port when trying to receive DCS downlink or the
* PCS Rx port when trying to receive PCS downlink, and everything will
* just work. However, if you are interested in using OsmocomBB for
* various hacking purposes (its original and primary intended use)
* and you need to tune your phone's TRF6151 receiver out of spec or
* at least outside of the DCS/PCS Rx SAW filter's legitimate passband
* (or if you have changed or removed that SAW filter), then you need
* to change the following rffe_get_rx_ports() function to match your
* specific hw version, i.e., PORT_DCS1800 only or PORT_PCS1900 only.
*/
uint32_t rffe_get_rx_ports(void)
{
return (1 << PORT_LO) | (1 << PORT_DCS1800) | (1 << PORT_PCS1900);
}
uint32_t rffe_get_tx_ports(void)
{
return (1 << PORT_LO) | (1 << PORT_HI);
}
/* Returns need for IQ swap */
int rffe_iq_swapped(uint16_t band_arfcn, int tx)
{
return trf6151_iq_swapped(band_arfcn, tx);
}
#define MCU_SW_TRACE 0xfffef00e
#define ARM_CONF_REG 0xfffef006
void rffe_init(void)
{
uint16_t reg;
reg = readw(ARM_CONF_REG);
reg &= ~ (1 << 5); /* TSPACT6 I/O function, not nCS6 */
writew(reg, ARM_CONF_REG);
reg = readw(MCU_SW_TRACE);
reg &= ~(1 << 5); /* TSPACT8 I/O function, not nMREQ */
writew(reg, MCU_SW_TRACE);
/* Configure the TSPEN which is connected to the TWL3025 */
tsp_setup(IOTA_STROBE, 1, 0, 0);
trf6151_init(RITA_STROBE, RITA_RESET);
}
uint8_t rffe_get_gain(void)
{
return trf6151_get_gain();
}
void rffe_set_gain(uint8_t dbm)
{
trf6151_set_gain(dbm);
}
const uint8_t system_inherent_gain = SYSTEM_INHERENT_GAIN;
/* Given the expected input level of exp_inp dBm/8 and the target of target_bb
* dBm8, configure the RF Frontend with the respective gain */
void rffe_compute_gain(int16_t exp_inp, int16_t target_bb)
{
trf6151_compute_gain(exp_inp, target_bb);
}
void rffe_rx_win_ctrl(int16_t exp_inp, int16_t target_bb)
{
/* FIXME */
}
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