* Copyright (c) 2004, 2005 David Young. All rights reserved.

/* $NetBSD: rtwphy.c,v 1.17 2019/11/10 21:16:35 chs Exp $ */
/*-
* Copyright (c) 2004, 2005 David Young. All rights reserved.
*
* Programmed for NetBSD by David Young.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL David
* Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
/*
* Control the Philips SA2400 RF front-end and the baseband processor
* built into the Realtek RTL8180.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtwphy.c,v 1.17 2019/11/10 21:16:35 chs Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/device.h>

#include <sys/bus.h>

#include <net/if.h>
#include <net/if_media.h>
#include <net/if_ether.h>

#include <net80211/ieee80211_netbsd.h>
#include <net80211/ieee80211_radiotap.h>
#include <net80211/ieee80211_var.h>

#include <dev/ic/rtwreg.h>
#include <dev/ic/max2820reg.h>
#include <dev/ic/sa2400reg.h>
#include <dev/ic/rtwvar.h>
#include <dev/ic/rtwphyio.h>
#include <dev/ic/rtwphy.h>

static int rtw_max2820_pwrstate(struct rtw_rf *, enum rtw_pwrstate);
static int rtw_sa2400_pwrstate(struct rtw_rf *, enum rtw_pwrstate);

#define GCT_WRITE(__gr, __addr, __val, __label) \
do { \
if (rtw_rfbus_write(&(__gr)->gr_bus, RTW_RFCHIPID_GCT, \
(__addr), (__val)) == -1) \
goto __label; \
} while(0)

static int
rtw_bbp_preinit(struct rtw_regs *regs, u_int antatten0, int dflantb,
u_int freq)
{
u_int antatten = antatten0;
if (dflantb)
antatten |= RTW_BBP_ANTATTEN_DFLANTB;
if (freq == 2484) /* channel 14 */
antatten |= RTW_BBP_ANTATTEN_CHAN14;
return rtw_bbp_write(regs, RTW_BBP_ANTATTEN, antatten);
}

static int
rtw_bbp_init(struct rtw_regs *regs, struct rtw_bbpset *bb, int antdiv,
int dflantb, uint8_t cs_threshold, u_int freq)
{
int rc;
uint32_t sys2, sys3;

sys2 = bb->bb_sys2;
if (antdiv)
sys2 |= RTW_BBP_SYS2_ANTDIV;
sys3 = bb->bb_sys3 |
__SHIFTIN(cs_threshold, RTW_BBP_SYS3_CSTHRESH_MASK);

#define RTW_BBP_WRITE_OR_RETURN(reg, val) \
if ((rc = rtw_bbp_write(regs, reg, val)) != 0) \
return rc;

RTW_BBP_WRITE_OR_RETURN(RTW_BBP_SYS1, bb->bb_sys1);
RTW_BBP_WRITE_OR_RETURN(RTW_BBP_TXAGC, bb->bb_txagc);
RTW_BBP_WRITE_OR_RETURN(RTW_BBP_LNADET, bb->bb_lnadet);
RTW_BBP_WRITE_OR_RETURN(RTW_BBP_IFAGCINI, bb->bb_ifagcini);
RTW_BBP_WRITE_OR_RETURN(RTW_BBP_IFAGCLIMIT, bb->bb_ifagclimit);
RTW_BBP_WRITE_OR_RETURN(RTW_BBP_IFAGCDET, bb->bb_ifagcdet);

if ((rc = rtw_bbp_preinit(regs, bb->bb_antatten, dflantb, freq)) != 0)
return rc;

RTW_BBP_WRITE_OR_RETURN(RTW_BBP_TRL, bb->bb_trl);
RTW_BBP_WRITE_OR_RETURN(RTW_BBP_SYS2, sys2);
RTW_BBP_WRITE_OR_RETURN(RTW_BBP_SYS3, sys3);
RTW_BBP_WRITE_OR_RETURN(RTW_BBP_CHESTLIM, bb->bb_chestlim);
RTW_BBP_WRITE_OR_RETURN(RTW_BBP_CHSQLIM, bb->bb_chsqlim);
return 0;
}

static int
rtw_sa2400_txpower(struct rtw_rf *rf, uint8_t opaque_txpower)
{
struct rtw_sa2400 *sa = (struct rtw_sa2400 *)rf;
struct rtw_rfbus *bus = &sa->sa_bus;

return rtw_rfbus_write(bus, RTW_RFCHIPID_PHILIPS, SA2400_TX,
opaque_txpower);
}

/* make sure we're using the same settings as the reference driver */
static void
verify_syna(u_int freq, uint32_t val)
{
#ifdef DIAGNOSTIC
uint32_t expected_val = ~val;

switch (freq) {
case 2412:
expected_val = 0x0000096c; /* ch 1 */
break;
case 2417:
expected_val = 0x00080970; /* ch 2 */
break;
case 2422:
expected_val = 0x00100974; /* ch 3 */
break;
case 2427:
expected_val = 0x00180978; /* ch 4 */
break;
case 2432:
expected_val = 0x00000980; /* ch 5 */
break;
case 2437:
expected_val = 0x00080984; /* ch 6 */
break;
case 2442:
expected_val = 0x00100988; /* ch 7 */
break;
case 2447:
expected_val = 0x0018098c; /* ch 8 */
break;
case 2452:
expected_val = 0x00000994; /* ch 9 */
break;
case 2457:
expected_val = 0x00080998; /* ch 10 */
break;
case 2462:
expected_val = 0x0010099c; /* ch 11 */
break;
case 2467:
expected_val = 0x001809a0; /* ch 12 */
break;
case 2472:
expected_val = 0x000009a8; /* ch 13 */
break;
case 2484:
expected_val = 0x000009b4; /* ch 14 */
break;
}
KASSERT(val == expected_val);
#endif
}

/* freq is in MHz */
static int
rtw_sa2400_tune(struct rtw_rf *rf, u_int freq)
{
struct rtw_sa2400 *sa = (struct rtw_sa2400 *)rf;
struct rtw_rfbus *bus = &sa->sa_bus;
int rc;
uint32_t syna, synb, sync;

/* XO = 44MHz, R = 11, hence N is in units of XO / R = 4MHz.
*
* The channel spacing (5MHz) is not divisible by 4MHz, so
* we set the fractional part of N to compensate.
*/
int n = freq / 4, nf = (freq % 4) * 2;

syna = __SHIFTIN(nf, SA2400_SYNA_NF_MASK) | __SHIFTIN(n, SA2400_SYNA_N_MASK);
verify_syna(freq, syna);

/* Divide the 44MHz crystal down to 4MHz. Set the fractional
* compensation charge pump value to agree with the fractional
* modulus.
*/
synb = __SHIFTIN(11, SA2400_SYNB_R_MASK) | SA2400_SYNB_L_NORMAL |
SA2400_SYNB_ON | SA2400_SYNB_ONE |
__SHIFTIN(80, SA2400_SYNB_FC_MASK); /* agrees w/ SA2400_SYNA_FM = 0 */

sync = SA2400_SYNC_CP_NORMAL;

if ((rc = rtw_rfbus_write(bus, RTW_RFCHIPID_PHILIPS, SA2400_SYNA,
syna)) != 0)
return rc;
if ((rc = rtw_rfbus_write(bus, RTW_RFCHIPID_PHILIPS, SA2400_SYNB,
synb)) != 0)
return rc;
if ((rc = rtw_rfbus_write(bus, RTW_RFCHIPID_PHILIPS, SA2400_SYNC,
sync)) != 0)
return rc;
return rtw_rfbus_write(bus, RTW_RFCHIPID_PHILIPS, SA2400_SYND, 0x0);
}

static int
rtw_sa2400_pwrstate(struct rtw_rf *rf, enum rtw_pwrstate power)
{
struct rtw_sa2400 *sa = (struct rtw_sa2400 *)rf;
struct rtw_rfbus *bus = &sa->sa_bus;
uint32_t opmode;
opmode = SA2400_OPMODE_DEFAULTS;
switch (power) {
case RTW_ON:
opmode |= SA2400_OPMODE_MODE_TXRX;
break;
case RTW_SLEEP:
opmode |= SA2400_OPMODE_MODE_WAIT;
break;
case RTW_OFF:
opmode |= SA2400_OPMODE_MODE_SLEEP;
break;
}

if (sa->sa_digphy)
opmode |= SA2400_OPMODE_DIGIN;

return rtw_rfbus_write(bus, RTW_RFCHIPID_PHILIPS, SA2400_OPMODE,
opmode);
}

static int
rtw_sa2400_manrx_init(struct rtw_sa2400 *sa)
{
uint32_t manrx;

/* XXX we are not supposed to be in RXMGC mode when we do
* this?
*/
manrx = SA2400_MANRX_AHSN;
manrx |= SA2400_MANRX_TEN;
manrx |= __SHIFTIN(1023, SA2400_MANRX_RXGAIN_MASK);

return rtw_rfbus_write(&sa->sa_bus, RTW_RFCHIPID_PHILIPS, SA2400_MANRX,
manrx);
}

static int
rtw_sa2400_vcocal_start(struct rtw_sa2400 *sa, int start)
{
uint32_t opmode;

opmode = SA2400_OPMODE_DEFAULTS;
if (start)
opmode |= SA2400_OPMODE_MODE_VCOCALIB;
else
opmode |= SA2400_OPMODE_MODE_SLEEP;

if (sa->sa_digphy)
opmode |= SA2400_OPMODE_DIGIN;

return rtw_rfbus_write(&sa->sa_bus, RTW_RFCHIPID_PHILIPS, SA2400_OPMODE,
opmode);
}

static int
rtw_sa2400_vco_calibration(struct rtw_sa2400 *sa)
{
int rc;
/* calibrate VCO */
if ((rc = rtw_sa2400_vcocal_start(sa, 1)) != 0)
return rc;
DELAY(2200); /* 2.2 milliseconds */
/* XXX superfluous: SA2400 automatically entered SLEEP mode. */
return rtw_sa2400_vcocal_start(sa, 0);
}

static int
rtw_sa2400_filter_calibration(struct rtw_sa2400 *sa)
{
uint32_t opmode;

opmode = SA2400_OPMODE_DEFAULTS | SA2400_OPMODE_MODE_FCALIB;
if (sa->sa_digphy)
opmode |= SA2400_OPMODE_DIGIN;

return rtw_rfbus_write(&sa->sa_bus, RTW_RFCHIPID_PHILIPS, SA2400_OPMODE,
opmode);
}

static int
rtw_sa2400_dc_calibration(struct rtw_sa2400 *sa)
{
struct rtw_rf *rf = &sa->sa_rf;
int rc;
uint32_t dccal;

(*rf->rf_continuous_tx_cb)(rf->rf_continuous_tx_arg, 1);

dccal = SA2400_OPMODE_DEFAULTS | SA2400_OPMODE_MODE_TXRX;

rc = rtw_rfbus_write(&sa->sa_bus, RTW_RFCHIPID_PHILIPS, SA2400_OPMODE,
dccal);
if (rc != 0)
return rc;

DELAY(5); /* DCALIB after being in Tx mode for 5
* microseconds
*/

dccal &= ~SA2400_OPMODE_MODE_MASK;
dccal |= SA2400_OPMODE_MODE_DCALIB;

rc = rtw_rfbus_write(&sa->sa_bus, RTW_RFCHIPID_PHILIPS, SA2400_OPMODE,
dccal);
if (rc != 0)
return rc;

DELAY(20); /* calibration takes at most 20 microseconds */

(*rf->rf_continuous_tx_cb)(rf->rf_continuous_tx_arg, 0);

return 0;
}

static int
rtw_sa2400_agc_init(struct rtw_sa2400 *sa)
{
uint32_t agc;

agc = __SHIFTIN(25, SA2400_AGC_MAXGAIN_MASK);
agc |= __SHIFTIN(7, SA2400_AGC_BBPDELAY_MASK);
agc |= __SHIFTIN(15, SA2400_AGC_LNADELAY_MASK);
agc |= __SHIFTIN(27, SA2400_AGC_RXONDELAY_MASK);

return rtw_rfbus_write(&sa->sa_bus, RTW_RFCHIPID_PHILIPS, SA2400_AGC,
agc);
}

static void
rtw_sa2400_destroy(struct rtw_rf *rf)
{
struct rtw_sa2400 *sa = (struct rtw_sa2400 *)rf;
memset(sa, 0, sizeof(*sa));
free(sa, M_DEVBUF);
}

static int
rtw_sa2400_calibrate(struct rtw_rf *rf, u_int freq)
{
struct rtw_sa2400 *sa = (struct rtw_sa2400 *)rf;
int i, rc;

/* XXX reference driver calibrates VCO twice. Is it a bug? */
for (i = 0; i < 2; i++) {
if ((rc = rtw_sa2400_vco_calibration(sa)) != 0)
return rc;
}
/* VCO calibration erases synthesizer registers, so re-tune */
if ((rc = rtw_sa2400_tune(rf, freq)) != 0)
return rc;
if ((rc = rtw_sa2400_filter_calibration(sa)) != 0)
return rc;
/* analog PHY needs DC calibration */
if (!sa->sa_digphy)
return rtw_sa2400_dc_calibration(sa);
return 0;
}

static int
rtw_sa2400_init(struct rtw_rf *rf, u_int freq, uint8_t opaque_txpower,
enum rtw_pwrstate power)
{
struct rtw_sa2400 *sa = (struct rtw_sa2400 *)rf;
int rc;

if ((rc = rtw_sa2400_txpower(rf, opaque_txpower)) != 0)
return rc;

/* skip configuration if it's time to sleep or to power-down. */
if (power == RTW_SLEEP || power == RTW_OFF)
return rtw_sa2400_pwrstate(rf, power);

/* go to sleep for configuration */
if ((rc = rtw_sa2400_pwrstate(rf, RTW_SLEEP)) != 0)
return rc;

if ((rc = rtw_sa2400_tune(rf, freq)) != 0)
return rc;
if ((rc = rtw_sa2400_agc_init(sa)) != 0)
return rc;
if ((rc = rtw_sa2400_manrx_init(sa)) != 0)
return rc;
if ((rc = rtw_sa2400_calibrate(rf, freq)) != 0)
return rc;

/* enter Tx/Rx mode */
return rtw_sa2400_pwrstate(rf, power);
}

struct rtw_rf *
rtw_sa2400_create(struct rtw_regs *regs, rtw_rf_write_t rf_write, int digphy)
{
struct rtw_sa2400 *sa;
struct rtw_rfbus *bus;
struct rtw_rf *rf;
struct rtw_bbpset *bb;

sa = malloc(sizeof(*sa), M_DEVBUF, M_WAITOK | M_ZERO);
sa->sa_digphy = digphy;

rf = &sa->sa_rf;
bus = &sa->sa_bus;

rf->rf_init = rtw_sa2400_init;
rf->rf_destroy = rtw_sa2400_destroy;
rf->rf_txpower = rtw_sa2400_txpower;
rf->rf_tune = rtw_sa2400_tune;
rf->rf_pwrstate = rtw_sa2400_pwrstate;
bb = &rf->rf_bbpset;

/* XXX magic */
bb->bb_antatten = RTW_BBP_ANTATTEN_PHILIPS_MAGIC;
bb->bb_chestlim = 0x00;
bb->bb_chsqlim = 0xa0;
bb->bb_ifagcdet = 0x64;
bb->bb_ifagcini = 0x90;
bb->bb_ifagclimit = 0x1a;
bb->bb_lnadet = 0xe0;
bb->bb_sys1 = 0x98;
bb->bb_sys2 = 0x47;
bb->bb_sys3 = 0x90;
bb->bb_trl = 0x88;
bb->bb_txagc = 0x38;

bus->b_regs = regs;
bus->b_write = rf_write;

return &sa->sa_rf;
}

static int
rtw_grf5101_txpower(struct rtw_rf *rf, uint8_t opaque_txpower)
{
struct rtw_grf5101 *gr = (struct rtw_grf5101 *)rf;

GCT_WRITE(gr, 0x15, 0, err);
GCT_WRITE(gr, 0x06, opaque_txpower, err);
GCT_WRITE(gr, 0x15, 0x10, err);
GCT_WRITE(gr, 0x15, 0x00, err);
return 0;
err:
return -1;
}

static int
rtw_grf5101_pwrstate(struct rtw_rf *rf, enum rtw_pwrstate power)
{
struct rtw_grf5101 *gr = (struct rtw_grf5101 *)rf;
switch (power) {
case RTW_OFF:
case RTW_SLEEP:
GCT_WRITE(gr, 0x07, 0x0000, err);
GCT_WRITE(gr, 0x1f, 0x0045, err);
GCT_WRITE(gr, 0x1f, 0x0005, err);
GCT_WRITE(gr, 0x00, 0x08e4, err);
default:
break;
case RTW_ON:
GCT_WRITE(gr, 0x1f, 0x0001, err);
DELAY(10);
GCT_WRITE(gr, 0x1f, 0x0001, err);
DELAY(10);
GCT_WRITE(gr, 0x1f, 0x0041, err);
DELAY(10);
GCT_WRITE(gr, 0x1f, 0x0061, err);
DELAY(10);
GCT_WRITE(gr, 0x00, 0x0ae4, err);
DELAY(10);
GCT_WRITE(gr, 0x07, 0x1000, err);
DELAY(100);
break;
}

return 0;
err:
return -1;
}

static int
rtw_grf5101_tune(struct rtw_rf *rf, u_int freq)
{
int channel;
struct rtw_grf5101 *gr = (struct rtw_grf5101 *)rf;

if (freq == 2484)
channel = 14;
else if ((channel = (freq - 2412) / 5 + 1) < 1 || channel > 13) {
RTW_DPRINTF(RTW_DEBUG_PHY,
("%s: invalid channel %d (freq %d)\n", __func__, channel,
freq));
return -1;
}

GCT_WRITE(gr, 0x07, 0, err);
GCT_WRITE(gr, 0x0b, channel - 1, err);
GCT_WRITE(gr, 0x07, 0x1000, err);
return 0;
err:
return -1;
}

static int
rtw_grf5101_init(struct rtw_rf *rf, u_int freq, uint8_t opaque_txpower,
enum rtw_pwrstate power)
{
int rc;
struct rtw_grf5101 *gr = (struct rtw_grf5101 *)rf;

/*
* These values have been derived from the rtl8180-sa2400
* Linux driver. It is unknown what they all do, GCT refuse
* to release any documentation so these are more than
* likely sub optimal settings
*/

GCT_WRITE(gr, 0x01, 0x1a23, err);
GCT_WRITE(gr, 0x02, 0x4971, err);
GCT_WRITE(gr, 0x03, 0x41de, err);
GCT_WRITE(gr, 0x04, 0x2d80, err);

GCT_WRITE(gr, 0x05, 0x61ff, err);

GCT_WRITE(gr, 0x06, 0x0, err);

GCT_WRITE(gr, 0x08, 0x7533, err);
GCT_WRITE(gr, 0x09, 0xc401, err);
GCT_WRITE(gr, 0x0a, 0x0, err);
GCT_WRITE(gr, 0x0c, 0x1c7, err);
GCT_WRITE(gr, 0x0d, 0x29d3, err);
GCT_WRITE(gr, 0x0e, 0x2e8, err);
GCT_WRITE(gr, 0x10, 0x192, err);
GCT_WRITE(gr, 0x11, 0x248, err);
GCT_WRITE(gr, 0x12, 0x0, err);
GCT_WRITE(gr, 0x13, 0x20c4, err);
GCT_WRITE(gr, 0x14, 0xf4fc, err);
GCT_WRITE(gr, 0x15, 0x0, err);
GCT_WRITE(gr, 0x16, 0x1500, err);

if ((rc = rtw_grf5101_txpower(rf, opaque_txpower)) != 0)
return rc;

if ((rc = rtw_grf5101_tune(rf, freq)) != 0)
return rc;

return 0;
err:
return -1;
}

static void
rtw_grf5101_destroy(struct rtw_rf *rf)
{
struct rtw_grf5101 *gr = (struct rtw_grf5101 *)rf;
memset(gr, 0, sizeof(*gr));
free(gr, M_DEVBUF);
}

struct rtw_rf *
rtw_grf5101_create(struct rtw_regs *regs, rtw_rf_write_t rf_write,
int digphy)
{
struct rtw_grf5101 *gr;
struct rtw_rfbus *bus;
struct rtw_rf *rf;
struct rtw_bbpset *bb;

gr = malloc(sizeof(*gr), M_DEVBUF, M_WAITOK | M_ZERO);

rf = &gr->gr_rf;
bus = &gr->gr_bus;

rf->rf_init = rtw_grf5101_init;
rf->rf_destroy = rtw_grf5101_destroy;
rf->rf_txpower = rtw_grf5101_txpower;
rf->rf_tune = rtw_grf5101_tune;
rf->rf_pwrstate = rtw_grf5101_pwrstate;
bb = &rf->rf_bbpset;

/* XXX magic */
bb->bb_antatten = RTW_BBP_ANTATTEN_GCT_MAGIC;
bb->bb_chestlim = 0x00;
bb->bb_chsqlim = 0xa0;
bb->bb_ifagcdet = 0x64;
bb->bb_ifagcini = 0x90;
bb->bb_ifagclimit = 0x1e;
bb->bb_lnadet = 0xc0;
bb->bb_sys1 = 0xa8;
bb->bb_sys2 = 0x47;
bb->bb_sys3 = 0x9b;
bb->bb_trl = 0x88;
bb->bb_txagc = 0x08;

bus->b_regs = regs;
bus->b_write = rf_write;

return &gr->gr_rf;
}

/* freq is in MHz */
static int
rtw_max2820_tune(struct rtw_rf *rf, u_int freq)
{
struct rtw_max2820 *mx = (struct rtw_max2820 *)rf;
struct rtw_rfbus *bus = &mx->mx_bus;

if (freq < 2400 || freq > 2499)
return -1;

return rtw_rfbus_write(bus, RTW_RFCHIPID_MAXIM, MAX2820_CHANNEL,
__SHIFTIN(freq - 2400, MAX2820_CHANNEL_CF_MASK));
}

static void
rtw_max2820_destroy(struct rtw_rf *rf)
{
struct rtw_max2820 *mx = (struct rtw_max2820 *)rf;
memset(mx, 0, sizeof(*mx));
free(mx, M_DEVBUF);
}

static int
rtw_max2820_init(struct rtw_rf *rf, u_int freq, uint8_t opaque_txpower,
enum rtw_pwrstate power)
{
struct rtw_max2820 *mx = (struct rtw_max2820 *)rf;
struct rtw_rfbus *bus = &mx->mx_bus;
int rc;

if ((rc = rtw_rfbus_write(bus, RTW_RFCHIPID_MAXIM, MAX2820_TEST,
MAX2820_TEST_DEFAULT)) != 0)
return rc;

if ((rc = rtw_rfbus_write(bus, RTW_RFCHIPID_MAXIM, MAX2820_ENABLE,
MAX2820_ENABLE_DEFAULT)) != 0)
return rc;

/* skip configuration if it's time to sleep or to power-down. */
if ((rc = rtw_max2820_pwrstate(rf, power)) != 0)
return rc;
else if (power == RTW_OFF || power == RTW_SLEEP)
return 0;

if ((rc = rtw_rfbus_write(bus, RTW_RFCHIPID_MAXIM, MAX2820_SYNTH,
MAX2820_SYNTH_R_44MHZ)) != 0)
return rc;

if ((rc = rtw_max2820_tune(rf, freq)) != 0)
return rc;

/* XXX The MAX2820 datasheet indicates that 1C and 2C should not
* be changed from 7, however, the reference driver sets them
* to 4 and 1, respectively.
*/
if ((rc = rtw_rfbus_write(bus, RTW_RFCHIPID_MAXIM, MAX2820_RECEIVE,
MAX2820_RECEIVE_DL_DEFAULT |
__SHIFTIN(4, MAX2820A_RECEIVE_1C_MASK) |
__SHIFTIN(1, MAX2820A_RECEIVE_2C_MASK))) != 0)
return rc;

return rtw_rfbus_write(bus, RTW_RFCHIPID_MAXIM, MAX2820_TRANSMIT,
MAX2820_TRANSMIT_PA_DEFAULT);
}

static int
rtw_max2820_txpower(struct rtw_rf *rf, uint8_t opaque_txpower)
{
/* TBD */
return 0;
}

static int
rtw_max2820_pwrstate(struct rtw_rf *rf, enum rtw_pwrstate power)
{
uint32_t enable;
struct rtw_max2820 *mx;
struct rtw_rfbus *bus;

mx = (struct rtw_max2820 *)rf;
bus = &mx->mx_bus;

switch (power) {
case RTW_OFF:
case RTW_SLEEP:
default:
enable = 0x0;
break;
case RTW_ON:
enable = MAX2820_ENABLE_DEFAULT;
break;
}
return rtw_rfbus_write(bus, RTW_RFCHIPID_MAXIM, MAX2820_ENABLE, enable);
}

struct rtw_rf *
rtw_max2820_create(struct rtw_regs *regs, rtw_rf_write_t rf_write, int is_a)
{
struct rtw_max2820 *mx;
struct rtw_rfbus *bus;
struct rtw_rf *rf;
struct rtw_bbpset *bb;

mx = malloc(sizeof(*mx), M_DEVBUF, M_WAITOK | M_ZERO);
mx->mx_is_a = is_a;

rf = &mx->mx_rf;
bus = &mx->mx_bus;

rf->rf_init = rtw_max2820_init;
rf->rf_destroy = rtw_max2820_destroy;
rf->rf_txpower = rtw_max2820_txpower;
rf->rf_tune = rtw_max2820_tune;
rf->rf_pwrstate = rtw_max2820_pwrstate;
bb = &rf->rf_bbpset;

/* XXX magic */
bb->bb_antatten = RTW_BBP_ANTATTEN_MAXIM_MAGIC;
bb->bb_chestlim = 0;
bb->bb_chsqlim = 159;
bb->bb_ifagcdet = 100;
bb->bb_ifagcini = 144;
bb->bb_ifagclimit = 26;
bb->bb_lnadet = 248;
bb->bb_sys1 = 136;
bb->bb_sys2 = 71;
bb->bb_sys3 = 155;
bb->bb_trl = 136;
bb->bb_txagc = 8;

bus->b_regs = regs;
bus->b_write = rf_write;

return &mx->mx_rf;
}

/* freq is in MHz */
int
rtw_phy_init(struct rtw_regs *regs, struct rtw_rf *rf, uint8_t opaque_txpower,
uint8_t cs_threshold, u_int freq, int antdiv, int dflantb,
enum rtw_pwrstate power)
{
int rc;
RTW_DPRINTF(RTW_DEBUG_PHY,
("%s: txpower %u csthresh %u freq %u antdiv %u dflantb %u "
"pwrstate %s\n", __func__, opaque_txpower, cs_threshold, freq,
antdiv, dflantb, rtw_pwrstate_string(power)));

/* XXX is this really necessary? */
if ((rc = rtw_rf_txpower(rf, opaque_txpower)) != 0)
return rc;
if ((rc = rtw_bbp_preinit(regs, rf->rf_bbpset.bb_antatten, dflantb,
freq)) != 0)
return rc;
if ((rc = rtw_rf_tune(rf, freq)) != 0)
return rc;
/* initialize RF */
if ((rc = rtw_rf_init(rf, freq, opaque_txpower, power)) != 0)
return rc;
#if 0 /* what is this redundant tx power setting here for? */
if ((rc = rtw_rf_txpower(rf, opaque_txpower)) != 0)
return rc;
#endif
return rtw_bbp_init(regs, &rf->rf_bbpset, antdiv, dflantb,
cs_threshold, freq);
}