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/* RF frontend driver for Huawei GTM900-B modems, supporting both
* MG01GSMT and MGCxGSMT hardware variants */
/* (C) 2019 by Steve Markgraf <steve@steve-m.de>
*
* 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdint.h>
#include <stdio.h>
#include <debug.h>
#include <memory.h>
#include <rffe.h>
#include <calypso/tsp.h>
#include <rf/trf6151.h>
#include <flash/cfi_flash.h>
/* This is a value that has been measured for the GTM900-B: 74dBm,
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 74
/* describe how the RF frontend is wired on the Huawei GTM900-B */
#define IOTA_STROBE TSPEN(0) /* Strobe for the Iota TSP */
#define RITA_STROBE TSPEN(2) /* Strobe for the Rita TSP */
#define RITA_RESET TSPACT(0) /* Reset of the Rita TRF6151 */
#define PA_BAND_SELECT TSPACT(3) /* Low: 850/900, High: 1800/1900 */
#define PA_TX_ENABLE TSPACT(9) /* Enable the Power Amplifier */
/* MGC2GSMT Ver. BRF specific antenna switch signals, low active */
#define ASM_VC1 TSPACT(1) /* low on GSM900 TX */
#define ASM_VC2 TSPACT(2) /* low on DCS1800 TX */
/* MG01GSMT Ver. C specific antenna switch signals, low active */
#define CXG_CTLA TSPACT(4) /* CXG1192UR CTLA input */
#define CXG_CTLB TSPACT(1) /* CXG1192UR CTLB input */
#define CXG_CTLC TSPACT(2) /* CXG1192UR CTLC input */
/*
* The Sony CXG1192UR switch is wired as follows on the MG01GSMT Ver. C:
*
* Rx1: GSM850 RX filter (Epcos B5013)
* Rx2: GSM900 RX filter (Epcos B7710)
* Rx3: DCS1800 RX filter (Epcos 7714)
* Rx4: PCS1900 RX filter (not populated)
* Tx1: low band PA output
* Tx2: high band PA output
*/
extern int gtm900_hw_is_mg01gsmt; /* set in init.c */
static inline void rffe_mode_mgc2gsmt(enum gsm_band band, int tx)
{
uint16_t tspact = tsp_act_state();
/* First we mask off all bits from the state cache */
tspact &= ~(PA_BAND_SELECT | PA_TX_ENABLE);
tspact |= (ASM_VC1 | ASM_VC2); /* low-active */
#ifdef CONFIG_TX_ENABLE
/* Then we selectively set the bits on, if required */
if (tx) {
tspact |= PA_TX_ENABLE;
tspact &= ~CXG_CTLA;
if (band == GSM_BAND_1800 || band == GSM_BAND_1900) {
tspact |= PA_BAND_SELECT;
tspact &= ~ASM_VC2;
} else {
tspact &= ~ASM_VC1;
}
}
#endif /* TRANSMIT_SUPPORT */
tsp_act_update(tspact);
}
static inline void rffe_mode_mg01gsmt(enum gsm_band band, int tx)
{
uint16_t tspact = tsp_act_state();
/* First we mask off all bits from the state cache */
tspact &= ~(PA_BAND_SELECT | PA_TX_ENABLE);
tspact |= (CXG_CTLA | CXG_CTLB | CXG_CTLC); /* low-active */
switch (band) {
case GSM_BAND_850:
tspact &= ~CXG_CTLB; /* select Ant1 - Rx1 */
break;
case GSM_BAND_900:
tspact &= ~CXG_CTLC; /* select Ant1 - Rx2 */
break;
case GSM_BAND_1800: /* select Ant2 - Rx3 */
break;
case GSM_BAND_1900:
tspact &= ~(CXG_CTLB | CXG_CTLC); /* select Ant2 - Rx4 */
break;
default:
break;
}
#ifdef CONFIG_TX_ENABLE
/* Then we selectively set the bits on, if required */
if (tx) {
tspact |= PA_TX_ENABLE;
tspact &= ~CXG_CTLA;
if (band == GSM_BAND_1800 || band == GSM_BAND_1900) {
tspact |= PA_BAND_SELECT;
tspact &= ~CXG_CTLB;
}
}
#endif /* TRANSMIT_SUPPORT */
tsp_act_update(tspact);
}
/* switch RF Frontend Mode */
void rffe_mode(enum gsm_band band, int tx)
{
if (gtm900_hw_is_mg01gsmt)
rffe_mode_mg01gsmt(band, tx);
else
rffe_mode_mgc2gsmt(band, tx);
}
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 ARM_CONF_REG 0xfffef006
void rffe_init(void)
{
uint16_t reg;
reg = readw(ARM_CONF_REG);
reg &= ~ (1 << 7); /* TSPACT4 I/O function, not nRDYMEM */
writew(reg, ARM_CONF_REG);
/* 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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