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linux/drivers/net/wireless/broadcom/b43/lo.c
Kees Cook 3f649ab728 treewide: Remove uninitialized_var() usage 
Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings
(e.g. "unused variable"). If the compiler thinks it is uninitialized,
either simply initialize the variable or make compiler changes.

In preparation for removing[2] the[3] macro[4], remove all remaining
needless uses with the following script:

git grep '\buninitialized_var\b' | cut -d: -f1 | sort -u | \
	xargs perl -pi -e \
		's/\buninitialized_var\(([^\)]+)\)/\1/g;
		 s:\s*/\* (GCC be quiet|to make compiler happy) \*/$::g;'

drivers/video/fbdev/riva/riva_hw.c was manually tweaked to avoid
pathological white-space.

No outstanding warnings were found building allmodconfig with GCC 9.3.0
for x86_64, i386, arm64, arm, powerpc, powerpc64le, s390x, mips, sparc64,
alpha, and m68k.

[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/

Reviewed-by: Leon Romanovsky <leonro@mellanox.com> # drivers/infiniband and mlx4/mlx5
Acked-by: Jason Gunthorpe <jgg@mellanox.com> # IB
Acked-by: Kalle Valo <kvalo@codeaurora.org> # wireless drivers
Reviewed-by: Chao Yu <yuchao0@huawei.com> # erofs
Signed-off-by: Kees Cook <keescook@chromium.org>
2020-07-16 12:35:15 -07:00

1004 lines
26 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-or-later
/*
Broadcom B43 wireless driver
G PHY LO (LocalOscillator) Measuring and Control routines
Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
Copyright (c) 2005, 2006 Stefano Brivio <stefano.brivio@polimi.it>
Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
Copyright (c) 2005, 2006 Danny van Dyk <kugelfang@gentoo.org>
Copyright (c) 2005, 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch>
*/
#include "b43.h"
#include "lo.h"
#include "phy_g.h"
#include "main.h"
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/slab.h>
static struct b43_lo_calib *b43_find_lo_calib(struct b43_txpower_lo_control *lo,
const struct b43_bbatt *bbatt,
const struct b43_rfatt *rfatt)
{
struct b43_lo_calib *c;
list_for_each_entry(c, &lo->calib_list, list) {
if (!b43_compare_bbatt(&c->bbatt, bbatt))
continue;
if (!b43_compare_rfatt(&c->rfatt, rfatt))
continue;
return c;
}
return NULL;
}
/* Write the LocalOscillator Control (adjust) value-pair. */
static void b43_lo_write(struct b43_wldev *dev, struct b43_loctl *control)
{
struct b43_phy *phy = &dev->phy;
u16 value;
if (B43_DEBUG) {
if (unlikely(abs(control->i) > 16 || abs(control->q) > 16)) {
b43dbg(dev->wl, "Invalid LO control pair "
"(I: %d, Q: %d)\n", control->i, control->q);
dump_stack();
return;
}
}
B43_WARN_ON(phy->type != B43_PHYTYPE_G);
value = (u8) (control->q);
value |= ((u8) (control->i)) << 8;
b43_phy_write(dev, B43_PHY_LO_CTL, value);
}
static u16 lo_measure_feedthrough(struct b43_wldev *dev,
u16 lna, u16 pga, u16 trsw_rx)
{
struct b43_phy *phy = &dev->phy;
u16 rfover;
u16 feedthrough;
if (phy->gmode) {
lna <<= B43_PHY_RFOVERVAL_LNA_SHIFT;
pga <<= B43_PHY_RFOVERVAL_PGA_SHIFT;
B43_WARN_ON(lna & ~B43_PHY_RFOVERVAL_LNA);
B43_WARN_ON(pga & ~B43_PHY_RFOVERVAL_PGA);
/*FIXME This assertion fails B43_WARN_ON(trsw_rx & ~(B43_PHY_RFOVERVAL_TRSWRX |
B43_PHY_RFOVERVAL_BW));
*/
trsw_rx &= (B43_PHY_RFOVERVAL_TRSWRX | B43_PHY_RFOVERVAL_BW);
/* Construct the RF Override Value */
rfover = B43_PHY_RFOVERVAL_UNK;
rfover |= pga;
rfover |= lna;
rfover |= trsw_rx;
if ((dev->dev->bus_sprom->boardflags_lo & B43_BFL_EXTLNA)
&& phy->rev > 6)
rfover |= B43_PHY_RFOVERVAL_EXTLNA;
b43_phy_write(dev, B43_PHY_PGACTL, 0xE300);
b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
udelay(10);
rfover |= B43_PHY_RFOVERVAL_BW_LBW;
b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
udelay(10);
rfover |= B43_PHY_RFOVERVAL_BW_LPF;
b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
udelay(10);
b43_phy_write(dev, B43_PHY_PGACTL, 0xF300);
} else {
pga |= B43_PHY_PGACTL_UNKNOWN;
b43_phy_write(dev, B43_PHY_PGACTL, pga);
udelay(10);
pga |= B43_PHY_PGACTL_LOWBANDW;
b43_phy_write(dev, B43_PHY_PGACTL, pga);
udelay(10);
pga |= B43_PHY_PGACTL_LPF;
b43_phy_write(dev, B43_PHY_PGACTL, pga);
}
udelay(21);
feedthrough = b43_phy_read(dev, B43_PHY_LO_LEAKAGE);
/* This is a good place to check if we need to relax a bit,
* as this is the main function called regularly
* in the LO calibration. */
cond_resched();
return feedthrough;
}
/* TXCTL Register and Value Table.
* Returns the "TXCTL Register".
* "value" is the "TXCTL Value".
* "pad_mix_gain" is the PAD Mixer Gain.
*/
static u16 lo_txctl_register_table(struct b43_wldev *dev,
u16 *value, u16 *pad_mix_gain)
{
struct b43_phy *phy = &dev->phy;
u16 reg, v, padmix;
if (phy->type == B43_PHYTYPE_B) {
v = 0x30;
if (phy->radio_rev <= 5) {
reg = 0x43;
padmix = 0;
} else {
reg = 0x52;
padmix = 5;
}
} else {
if (phy->rev >= 2 && phy->radio_rev == 8) {
reg = 0x43;
v = 0x10;
padmix = 2;
} else {
reg = 0x52;
v = 0x30;
padmix = 5;
}
}
if (value)
*value = v;
if (pad_mix_gain)
*pad_mix_gain = padmix;
return reg;
}
static void lo_measure_txctl_values(struct b43_wldev *dev)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
struct b43_txpower_lo_control *lo = gphy->lo_control;
u16 reg, mask;
u16 trsw_rx, pga;
u16 radio_pctl_reg;
static const u8 tx_bias_values[] = {
0x09, 0x08, 0x0A, 0x01, 0x00,
0x02, 0x05, 0x04, 0x06,
};
static const u8 tx_magn_values[] = {
0x70, 0x40,
};
if (!has_loopback_gain(phy)) {
radio_pctl_reg = 6;
trsw_rx = 2;
pga = 0;
} else {
int lb_gain; /* Loopback gain (in dB) */
trsw_rx = 0;
lb_gain = gphy->max_lb_gain / 2;
if (lb_gain > 10) {
radio_pctl_reg = 0;
pga = abs(10 - lb_gain) / 6;
pga = clamp_val(pga, 0, 15);
} else {
int cmp_val;
int tmp;
pga = 0;
cmp_val = 0x24;
if ((phy->rev >= 2) &&
(phy->radio_ver == 0x2050) && (phy->radio_rev == 8))
cmp_val = 0x3C;
tmp = lb_gain;
if ((10 - lb_gain) < cmp_val)
tmp = (10 - lb_gain);
if (tmp < 0)
tmp += 6;
else
tmp += 3;
cmp_val /= 4;
tmp /= 4;
if (tmp >= cmp_val)
radio_pctl_reg = cmp_val;
else
radio_pctl_reg = tmp;
}
}
b43_radio_maskset(dev, 0x43, 0xFFF0, radio_pctl_reg);
b43_gphy_set_baseband_attenuation(dev, 2);
reg = lo_txctl_register_table(dev, &mask, NULL);
mask = ~mask;
b43_radio_mask(dev, reg, mask);
if (has_tx_magnification(phy)) {
int i, j;
int feedthrough;
int min_feedth = 0xFFFF;
u8 tx_magn, tx_bias;
for (i = 0; i < ARRAY_SIZE(tx_magn_values); i++) {
tx_magn = tx_magn_values[i];
b43_radio_maskset(dev, 0x52, 0xFF0F, tx_magn);
for (j = 0; j < ARRAY_SIZE(tx_bias_values); j++) {
tx_bias = tx_bias_values[j];
b43_radio_maskset(dev, 0x52, 0xFFF0, tx_bias);
feedthrough =
lo_measure_feedthrough(dev, 0, pga,
trsw_rx);
if (feedthrough < min_feedth) {
lo->tx_bias = tx_bias;
lo->tx_magn = tx_magn;
min_feedth = feedthrough;
}
if (lo->tx_bias == 0)
break;
}
b43_radio_write16(dev, 0x52,
(b43_radio_read16(dev, 0x52)
& 0xFF00) | lo->tx_bias | lo->
tx_magn);
}
} else {
lo->tx_magn = 0;
lo->tx_bias = 0;
b43_radio_mask(dev, 0x52, 0xFFF0); /* TX bias == 0 */
}
lo->txctl_measured_time = jiffies;
}
static void lo_read_power_vector(struct b43_wldev *dev)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
struct b43_txpower_lo_control *lo = gphy->lo_control;
int i;
u64 tmp;
u64 power_vector = 0;
for (i = 0; i < 8; i += 2) {
tmp = b43_shm_read16(dev, B43_SHM_SHARED, 0x310 + i);
power_vector |= (tmp << (i * 8));
/* Clear the vector on the device. */
b43_shm_write16(dev, B43_SHM_SHARED, 0x310 + i, 0);
}
if (power_vector)
lo->power_vector = power_vector;
lo->pwr_vec_read_time = jiffies;
}
/* 802.11/LO/GPHY/MeasuringGains */
static void lo_measure_gain_values(struct b43_wldev *dev,
s16 max_rx_gain, int use_trsw_rx)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
u16 tmp;
if (max_rx_gain < 0)
max_rx_gain = 0;
if (has_loopback_gain(phy)) {
int trsw_rx_gain;
if (use_trsw_rx) {
trsw_rx_gain = gphy->trsw_rx_gain / 2;
if (max_rx_gain >= trsw_rx_gain) {
trsw_rx_gain = max_rx_gain - trsw_rx_gain;
}
} else
trsw_rx_gain = max_rx_gain;
if (trsw_rx_gain < 9) {
gphy->lna_lod_gain = 0;
} else {
gphy->lna_lod_gain = 1;
trsw_rx_gain -= 8;
}
trsw_rx_gain = clamp_val(trsw_rx_gain, 0, 0x2D);
gphy->pga_gain = trsw_rx_gain / 3;
if (gphy->pga_gain >= 5) {
gphy->pga_gain -= 5;
gphy->lna_gain = 2;
} else
gphy->lna_gain = 0;
} else {
gphy->lna_gain = 0;
gphy->trsw_rx_gain = 0x20;
if (max_rx_gain >= 0x14) {
gphy->lna_lod_gain = 1;
gphy->pga_gain = 2;
} else if (max_rx_gain >= 0x12) {
gphy->lna_lod_gain = 1;
gphy->pga_gain = 1;
} else if (max_rx_gain >= 0xF) {
gphy->lna_lod_gain = 1;
gphy->pga_gain = 0;
} else {
gphy->lna_lod_gain = 0;
gphy->pga_gain = 0;
}
}
tmp = b43_radio_read16(dev, 0x7A);
if (gphy->lna_lod_gain == 0)
tmp &= ~0x0008;
else
tmp |= 0x0008;
b43_radio_write16(dev, 0x7A, tmp);
}
struct lo_g_saved_values {
u8 old_channel;
/* Core registers */
u16 reg_3F4;
u16 reg_3E2;
/* PHY registers */
u16 phy_lo_mask;
u16 phy_extg_01;
u16 phy_dacctl_hwpctl;
u16 phy_dacctl;
u16 phy_cck_14;
u16 phy_hpwr_tssictl;
u16 phy_analogover;
u16 phy_analogoverval;
u16 phy_rfover;
u16 phy_rfoverval;
u16 phy_classctl;
u16 phy_cck_3E;
u16 phy_crs0;
u16 phy_pgactl;
u16 phy_cck_2A;
u16 phy_syncctl;
u16 phy_cck_30;
u16 phy_cck_06;
/* Radio registers */
u16 radio_43;
u16 radio_7A;
u16 radio_52;
};
static void lo_measure_setup(struct b43_wldev *dev,
struct lo_g_saved_values *sav)
{
struct ssb_sprom *sprom = dev->dev->bus_sprom;
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
struct b43_txpower_lo_control *lo = gphy->lo_control;
u16 tmp;
if (b43_has_hardware_pctl(dev)) {
sav->phy_lo_mask = b43_phy_read(dev, B43_PHY_LO_MASK);
sav->phy_extg_01 = b43_phy_read(dev, B43_PHY_EXTG(0x01));
sav->phy_dacctl_hwpctl = b43_phy_read(dev, B43_PHY_DACCTL);
sav->phy_cck_14 = b43_phy_read(dev, B43_PHY_CCK(0x14));
sav->phy_hpwr_tssictl = b43_phy_read(dev, B43_PHY_HPWR_TSSICTL);
b43_phy_set(dev, B43_PHY_HPWR_TSSICTL, 0x100);
b43_phy_set(dev, B43_PHY_EXTG(0x01), 0x40);
b43_phy_set(dev, B43_PHY_DACCTL, 0x40);
b43_phy_set(dev, B43_PHY_CCK(0x14), 0x200);
}
if (phy->type == B43_PHYTYPE_B &&
phy->radio_ver == 0x2050 && phy->radio_rev < 6) {
b43_phy_write(dev, B43_PHY_CCK(0x16), 0x410);
b43_phy_write(dev, B43_PHY_CCK(0x17), 0x820);
}
if (phy->rev >= 2) {
sav->phy_analogover = b43_phy_read(dev, B43_PHY_ANALOGOVER);
sav->phy_analogoverval =
b43_phy_read(dev, B43_PHY_ANALOGOVERVAL);
sav->phy_rfover = b43_phy_read(dev, B43_PHY_RFOVER);
sav->phy_rfoverval = b43_phy_read(dev, B43_PHY_RFOVERVAL);
sav->phy_classctl = b43_phy_read(dev, B43_PHY_CLASSCTL);
sav->phy_cck_3E = b43_phy_read(dev, B43_PHY_CCK(0x3E));
sav->phy_crs0 = b43_phy_read(dev, B43_PHY_CRS0);
b43_phy_mask(dev, B43_PHY_CLASSCTL, 0xFFFC);
b43_phy_mask(dev, B43_PHY_CRS0, 0x7FFF);
b43_phy_set(dev, B43_PHY_ANALOGOVER, 0x0003);
b43_phy_mask(dev, B43_PHY_ANALOGOVERVAL, 0xFFFC);
if (phy->type == B43_PHYTYPE_G) {
if ((phy->rev >= 7) &&
(sprom->boardflags_lo & B43_BFL_EXTLNA)) {
b43_phy_write(dev, B43_PHY_RFOVER, 0x933);
} else {
b43_phy_write(dev, B43_PHY_RFOVER, 0x133);
}
} else {
b43_phy_write(dev, B43_PHY_RFOVER, 0);
}
b43_phy_write(dev, B43_PHY_CCK(0x3E), 0);
}
sav->reg_3F4 = b43_read16(dev, 0x3F4);
sav->reg_3E2 = b43_read16(dev, 0x3E2);
sav->radio_43 = b43_radio_read16(dev, 0x43);
sav->radio_7A = b43_radio_read16(dev, 0x7A);
sav->phy_pgactl = b43_phy_read(dev, B43_PHY_PGACTL);
sav->phy_cck_2A = b43_phy_read(dev, B43_PHY_CCK(0x2A));
sav->phy_syncctl = b43_phy_read(dev, B43_PHY_SYNCCTL);
sav->phy_dacctl = b43_phy_read(dev, B43_PHY_DACCTL);
if (!has_tx_magnification(phy)) {
sav->radio_52 = b43_radio_read16(dev, 0x52);
sav->radio_52 &= 0x00F0;
}
if (phy->type == B43_PHYTYPE_B) {
sav->phy_cck_30 = b43_phy_read(dev, B43_PHY_CCK(0x30));
sav->phy_cck_06 = b43_phy_read(dev, B43_PHY_CCK(0x06));
b43_phy_write(dev, B43_PHY_CCK(0x30), 0x00FF);
b43_phy_write(dev, B43_PHY_CCK(0x06), 0x3F3F);
} else {
b43_write16(dev, 0x3E2, b43_read16(dev, 0x3E2)
| 0x8000);
}
b43_write16(dev, 0x3F4, b43_read16(dev, 0x3F4)
& 0xF000);
tmp =
(phy->type == B43_PHYTYPE_G) ? B43_PHY_LO_MASK : B43_PHY_CCK(0x2E);
b43_phy_write(dev, tmp, 0x007F);
tmp = sav->phy_syncctl;
b43_phy_write(dev, B43_PHY_SYNCCTL, tmp & 0xFF7F);
tmp = sav->radio_7A;
b43_radio_write16(dev, 0x007A, tmp & 0xFFF0);
b43_phy_write(dev, B43_PHY_CCK(0x2A), 0x8A3);
if (phy->type == B43_PHYTYPE_G ||
(phy->type == B43_PHYTYPE_B &&
phy->radio_ver == 0x2050 && phy->radio_rev >= 6)) {
b43_phy_write(dev, B43_PHY_CCK(0x2B), 0x1003);
} else
b43_phy_write(dev, B43_PHY_CCK(0x2B), 0x0802);
if (phy->rev >= 2)
b43_dummy_transmission(dev, false, true);
b43_gphy_channel_switch(dev, 6, 0);
b43_radio_read16(dev, 0x51); /* dummy read */
if (phy->type == B43_PHYTYPE_G)
b43_phy_write(dev, B43_PHY_CCK(0x2F), 0);
/* Re-measure the txctl values, if needed. */
if (time_before(lo->txctl_measured_time,
jiffies - B43_LO_TXCTL_EXPIRE))
lo_measure_txctl_values(dev);
if (phy->type == B43_PHYTYPE_G && phy->rev >= 3) {
b43_phy_write(dev, B43_PHY_LO_MASK, 0xC078);
} else {
if (phy->type == B43_PHYTYPE_B)
b43_phy_write(dev, B43_PHY_CCK(0x2E), 0x8078);
else
b43_phy_write(dev, B43_PHY_LO_MASK, 0x8078);
}
}
static void lo_measure_restore(struct b43_wldev *dev,
struct lo_g_saved_values *sav)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
u16 tmp;
if (phy->rev >= 2) {
b43_phy_write(dev, B43_PHY_PGACTL, 0xE300);
tmp = (gphy->pga_gain << 8);
b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA0);
udelay(5);
b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA2);
udelay(2);
b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA3);
} else {
tmp = (gphy->pga_gain | 0xEFA0);
b43_phy_write(dev, B43_PHY_PGACTL, tmp);
}
if (phy->type == B43_PHYTYPE_G) {
if (phy->rev >= 3)
b43_phy_write(dev, B43_PHY_CCK(0x2E), 0xC078);
else
b43_phy_write(dev, B43_PHY_CCK(0x2E), 0x8078);
if (phy->rev >= 2)
b43_phy_write(dev, B43_PHY_CCK(0x2F), 0x0202);
else
b43_phy_write(dev, B43_PHY_CCK(0x2F), 0x0101);
}
b43_write16(dev, 0x3F4, sav->reg_3F4);
b43_phy_write(dev, B43_PHY_PGACTL, sav->phy_pgactl);
b43_phy_write(dev, B43_PHY_CCK(0x2A), sav->phy_cck_2A);
b43_phy_write(dev, B43_PHY_SYNCCTL, sav->phy_syncctl);
b43_phy_write(dev, B43_PHY_DACCTL, sav->phy_dacctl);
b43_radio_write16(dev, 0x43, sav->radio_43);
b43_radio_write16(dev, 0x7A, sav->radio_7A);
if (!has_tx_magnification(phy)) {
tmp = sav->radio_52;
b43_radio_maskset(dev, 0x52, 0xFF0F, tmp);
}
b43_write16(dev, 0x3E2, sav->reg_3E2);
if (phy->type == B43_PHYTYPE_B &&
phy->radio_ver == 0x2050 && phy->radio_rev <= 5) {
b43_phy_write(dev, B43_PHY_CCK(0x30), sav->phy_cck_30);
b43_phy_write(dev, B43_PHY_CCK(0x06), sav->phy_cck_06);
}
if (phy->rev >= 2) {
b43_phy_write(dev, B43_PHY_ANALOGOVER, sav->phy_analogover);
b43_phy_write(dev, B43_PHY_ANALOGOVERVAL,
sav->phy_analogoverval);
b43_phy_write(dev, B43_PHY_CLASSCTL, sav->phy_classctl);
b43_phy_write(dev, B43_PHY_RFOVER, sav->phy_rfover);
b43_phy_write(dev, B43_PHY_RFOVERVAL, sav->phy_rfoverval);
b43_phy_write(dev, B43_PHY_CCK(0x3E), sav->phy_cck_3E);
b43_phy_write(dev, B43_PHY_CRS0, sav->phy_crs0);
}
if (b43_has_hardware_pctl(dev)) {
tmp = (sav->phy_lo_mask & 0xBFFF);
b43_phy_write(dev, B43_PHY_LO_MASK, tmp);
b43_phy_write(dev, B43_PHY_EXTG(0x01), sav->phy_extg_01);
b43_phy_write(dev, B43_PHY_DACCTL, sav->phy_dacctl_hwpctl);
b43_phy_write(dev, B43_PHY_CCK(0x14), sav->phy_cck_14);
b43_phy_write(dev, B43_PHY_HPWR_TSSICTL, sav->phy_hpwr_tssictl);
}
b43_gphy_channel_switch(dev, sav->old_channel, 1);
}
struct b43_lo_g_statemachine {
int current_state;
int nr_measured;
int state_val_multiplier;
u16 lowest_feedth;
struct b43_loctl min_loctl;
};
/* Loop over each possible value in this state. */
static int lo_probe_possible_loctls(struct b43_wldev *dev,
struct b43_loctl *probe_loctl,
struct b43_lo_g_statemachine *d)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
struct b43_loctl test_loctl;
struct b43_loctl orig_loctl;
struct b43_loctl prev_loctl = {
.i = -100,
.q = -100,
};
int i;
int begin, end;
int found_lower = 0;
u16 feedth;
static const struct b43_loctl modifiers[] = {
{.i = 1,.q = 1,},
{.i = 1,.q = 0,},
{.i = 1,.q = -1,},
{.i = 0,.q = -1,},
{.i = -1,.q = -1,},
{.i = -1,.q = 0,},
{.i = -1,.q = 1,},
{.i = 0,.q = 1,},
};
if (d->current_state == 0) {
begin = 1;
end = 8;
} else if (d->current_state % 2 == 0) {
begin = d->current_state - 1;
end = d->current_state + 1;
} else {
begin = d->current_state - 2;
end = d->current_state + 2;
}
if (begin < 1)
begin += 8;
if (end > 8)
end -= 8;
memcpy(&orig_loctl, probe_loctl, sizeof(struct b43_loctl));
i = begin;
d->current_state = i;
while (1) {
B43_WARN_ON(!(i >= 1 && i <= 8));
memcpy(&test_loctl, &orig_loctl, sizeof(struct b43_loctl));
test_loctl.i += modifiers[i - 1].i * d->state_val_multiplier;
test_loctl.q += modifiers[i - 1].q * d->state_val_multiplier;
if ((test_loctl.i != prev_loctl.i ||
test_loctl.q != prev_loctl.q) &&
(abs(test_loctl.i) <= 16 && abs(test_loctl.q) <= 16)) {
b43_lo_write(dev, &test_loctl);
feedth = lo_measure_feedthrough(dev, gphy->lna_gain,
gphy->pga_gain,
gphy->trsw_rx_gain);
if (feedth < d->lowest_feedth) {
memcpy(probe_loctl, &test_loctl,
sizeof(struct b43_loctl));
found_lower = 1;
d->lowest_feedth = feedth;
if ((d->nr_measured < 2) &&
!has_loopback_gain(phy))
break;
}
}
memcpy(&prev_loctl, &test_loctl, sizeof(prev_loctl));
if (i == end)
break;
if (i == 8)
i = 1;
else
i++;
d->current_state = i;
}
return found_lower;
}
static void lo_probe_loctls_statemachine(struct b43_wldev *dev,
struct b43_loctl *loctl,
int *max_rx_gain)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
struct b43_lo_g_statemachine d;
u16 feedth;
int found_lower;
struct b43_loctl probe_loctl;
int max_repeat = 1, repeat_cnt = 0;
d.nr_measured = 0;
d.state_val_multiplier = 1;
if (has_loopback_gain(phy))
d.state_val_multiplier = 3;
memcpy(&d.min_loctl, loctl, sizeof(struct b43_loctl));
if (has_loopback_gain(phy))
max_repeat = 4;
do {
b43_lo_write(dev, &d.min_loctl);
feedth = lo_measure_feedthrough(dev, gphy->lna_gain,
gphy->pga_gain,
gphy->trsw_rx_gain);
if (feedth < 0x258) {
if (feedth >= 0x12C)
*max_rx_gain += 6;
else
*max_rx_gain += 3;
feedth = lo_measure_feedthrough(dev, gphy->lna_gain,
gphy->pga_gain,
gphy->trsw_rx_gain);
}
d.lowest_feedth = feedth;
d.current_state = 0;
do {
B43_WARN_ON(!
(d.current_state >= 0
&& d.current_state <= 8));
memcpy(&probe_loctl, &d.min_loctl,
sizeof(struct b43_loctl));
found_lower =
lo_probe_possible_loctls(dev, &probe_loctl, &d);
if (!found_lower)
break;
if ((probe_loctl.i == d.min_loctl.i) &&
(probe_loctl.q == d.min_loctl.q))
break;
memcpy(&d.min_loctl, &probe_loctl,
sizeof(struct b43_loctl));
d.nr_measured++;
} while (d.nr_measured < 24);
memcpy(loctl, &d.min_loctl, sizeof(struct b43_loctl));
if (has_loopback_gain(phy)) {
if (d.lowest_feedth > 0x1194)
*max_rx_gain -= 6;
else if (d.lowest_feedth < 0x5DC)
*max_rx_gain += 3;
if (repeat_cnt == 0) {
if (d.lowest_feedth <= 0x5DC) {
d.state_val_multiplier = 1;
repeat_cnt++;
} else
d.state_val_multiplier = 2;
} else if (repeat_cnt == 2)
d.state_val_multiplier = 1;
}
lo_measure_gain_values(dev, *max_rx_gain,
has_loopback_gain(phy));
} while (++repeat_cnt < max_repeat);
}
static
struct b43_lo_calib *b43_calibrate_lo_setting(struct b43_wldev *dev,
const struct b43_bbatt *bbatt,
const struct b43_rfatt *rfatt)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
struct b43_loctl loctl = {
.i = 0,
.q = 0,
};
int max_rx_gain;
struct b43_lo_calib *cal;
struct lo_g_saved_values saved_regs;
/* Values from the "TXCTL Register and Value Table" */
u16 txctl_reg;
u16 txctl_value;
u16 pad_mix_gain;
saved_regs.old_channel = phy->channel;
b43_mac_suspend(dev);
lo_measure_setup(dev, &saved_regs);
txctl_reg = lo_txctl_register_table(dev, &txctl_value, &pad_mix_gain);
b43_radio_maskset(dev, 0x43, 0xFFF0, rfatt->att);
b43_radio_maskset(dev, txctl_reg, ~txctl_value, (rfatt->with_padmix ? txctl_value :0));
max_rx_gain = rfatt->att * 2;
max_rx_gain += bbatt->att / 2;
if (rfatt->with_padmix)
max_rx_gain -= pad_mix_gain;
if (has_loopback_gain(phy))
max_rx_gain += gphy->max_lb_gain;
lo_measure_gain_values(dev, max_rx_gain,
has_loopback_gain(phy));
b43_gphy_set_baseband_attenuation(dev, bbatt->att);
lo_probe_loctls_statemachine(dev, &loctl, &max_rx_gain);
lo_measure_restore(dev, &saved_regs);
b43_mac_enable(dev);
if (b43_debug(dev, B43_DBG_LO)) {
b43dbg(dev->wl, "LO: Calibrated for BB(%u), RF(%u,%u) "
"=> I=%d Q=%d\n",
bbatt->att, rfatt->att, rfatt->with_padmix,
loctl.i, loctl.q);
}
cal = kmalloc(sizeof(*cal), GFP_KERNEL);
if (!cal) {
b43warn(dev->wl, "LO calib: out of memory\n");
return NULL;
}
memcpy(&cal->bbatt, bbatt, sizeof(*bbatt));
memcpy(&cal->rfatt, rfatt, sizeof(*rfatt));
memcpy(&cal->ctl, &loctl, sizeof(loctl));
cal->calib_time = jiffies;
INIT_LIST_HEAD(&cal->list);
return cal;
}
/* Get a calibrated LO setting for the given attenuation values.
* Might return a NULL pointer under OOM! */
static
struct b43_lo_calib *b43_get_calib_lo_settings(struct b43_wldev *dev,
const struct b43_bbatt *bbatt,
const struct b43_rfatt *rfatt)
{
struct b43_txpower_lo_control *lo = dev->phy.g->lo_control;
struct b43_lo_calib *c;
c = b43_find_lo_calib(lo, bbatt, rfatt);
if (c)
return c;
/* Not in the list of calibrated LO settings.
* Calibrate it now. */
c = b43_calibrate_lo_setting(dev, bbatt, rfatt);
if (!c)
return NULL;
list_add(&c->list, &lo->calib_list);
return c;
}
void b43_gphy_dc_lt_init(struct b43_wldev *dev, bool update_all)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
struct b43_txpower_lo_control *lo = gphy->lo_control;
int i;
int rf_offset, bb_offset;
const struct b43_rfatt *rfatt;
const struct b43_bbatt *bbatt;
u64 power_vector;
bool table_changed = false;
BUILD_BUG_ON(B43_DC_LT_SIZE != 32);
B43_WARN_ON(lo->rfatt_list.len * lo->bbatt_list.len > 64);
power_vector = lo->power_vector;
if (!update_all && !power_vector)
return; /* Nothing to do. */
/* Suspend the MAC now to avoid continuous suspend/enable
* cycles in the loop. */
b43_mac_suspend(dev);
for (i = 0; i < B43_DC_LT_SIZE * 2; i++) {
struct b43_lo_calib *cal;
int idx;
u16 val;
if (!update_all && !(power_vector & (((u64)1ULL) << i)))
continue;
/* Update the table entry for this power_vector bit.
* The table rows are RFatt entries and columns are BBatt. */
bb_offset = i / lo->rfatt_list.len;
rf_offset = i % lo->rfatt_list.len;
bbatt = &(lo->bbatt_list.list[bb_offset]);
rfatt = &(lo->rfatt_list.list[rf_offset]);
cal = b43_calibrate_lo_setting(dev, bbatt, rfatt);
if (!cal) {
b43warn(dev->wl, "LO: Could not "
"calibrate DC table entry\n");
continue;
}
/*FIXME: Is Q really in the low nibble? */
val = (u8)(cal->ctl.q);
val |= ((u8)(cal->ctl.i)) << 4;
kfree(cal);
/* Get the index into the hardware DC LT. */
idx = i / 2;
/* Change the table in memory. */
if (i % 2) {
/* Change the high byte. */
lo->dc_lt[idx] = (lo->dc_lt[idx] & 0x00FF)
| ((val & 0x00FF) << 8);
} else {
/* Change the low byte. */
lo->dc_lt[idx] = (lo->dc_lt[idx] & 0xFF00)
| (val & 0x00FF);
}
table_changed = true;
}
if (table_changed) {
/* The table changed in memory. Update the hardware table. */
for (i = 0; i < B43_DC_LT_SIZE; i++)
b43_phy_write(dev, 0x3A0 + i, lo->dc_lt[i]);
}
b43_mac_enable(dev);
}
/* Fixup the RF attenuation value for the case where we are
* using the PAD mixer. */
static inline void b43_lo_fixup_rfatt(struct b43_rfatt *rf)
{
if (!rf->with_padmix)
return;
if ((rf->att != 1) && (rf->att != 2) && (rf->att != 3))
rf->att = 4;
}
void b43_lo_g_adjust(struct b43_wldev *dev)
{
struct b43_phy_g *gphy = dev->phy.g;
struct b43_lo_calib *cal;
struct b43_rfatt rf;
memcpy(&rf, &gphy->rfatt, sizeof(rf));
b43_lo_fixup_rfatt(&rf);
cal = b43_get_calib_lo_settings(dev, &gphy->bbatt, &rf);
if (!cal)
return;
b43_lo_write(dev, &cal->ctl);
}
void b43_lo_g_adjust_to(struct b43_wldev *dev,
u16 rfatt, u16 bbatt, u16 tx_control)
{
struct b43_rfatt rf;
struct b43_bbatt bb;
struct b43_lo_calib *cal;
memset(&rf, 0, sizeof(rf));
memset(&bb, 0, sizeof(bb));
rf.att = rfatt;
bb.att = bbatt;
b43_lo_fixup_rfatt(&rf);
cal = b43_get_calib_lo_settings(dev, &bb, &rf);
if (!cal)
return;
b43_lo_write(dev, &cal->ctl);
}
/* Periodic LO maintenance work */
void b43_lo_g_maintenance_work(struct b43_wldev *dev)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
struct b43_txpower_lo_control *lo = gphy->lo_control;
unsigned long now;
unsigned long expire;
struct b43_lo_calib *cal, *tmp;
bool current_item_expired = false;
bool hwpctl;
if (!lo)
return;
now = jiffies;
hwpctl = b43_has_hardware_pctl(dev);
if (hwpctl) {
/* Read the power vector and update it, if needed. */
expire = now - B43_LO_PWRVEC_EXPIRE;
if (time_before(lo->pwr_vec_read_time, expire)) {
lo_read_power_vector(dev);
b43_gphy_dc_lt_init(dev, 0);
}
//FIXME Recalc the whole DC table from time to time?
}
if (hwpctl)
return;
/* Search for expired LO settings. Remove them.
* Recalibrate the current setting, if expired. */
expire = now - B43_LO_CALIB_EXPIRE;
list_for_each_entry_safe(cal, tmp, &lo->calib_list, list) {
if (!time_before(cal->calib_time, expire))
continue;
/* This item expired. */
if (b43_compare_bbatt(&cal->bbatt, &gphy->bbatt) &&
b43_compare_rfatt(&cal->rfatt, &gphy->rfatt)) {
B43_WARN_ON(current_item_expired);
current_item_expired = true;
}
if (b43_debug(dev, B43_DBG_LO)) {
b43dbg(dev->wl, "LO: Item BB(%u), RF(%u,%u), "
"I=%d, Q=%d expired\n",
cal->bbatt.att, cal->rfatt.att,
cal->rfatt.with_padmix,
cal->ctl.i, cal->ctl.q);
}
list_del(&cal->list);
kfree(cal);
}
if (current_item_expired || unlikely(list_empty(&lo->calib_list))) {
/* Recalibrate currently used LO setting. */
if (b43_debug(dev, B43_DBG_LO))
b43dbg(dev->wl, "LO: Recalibrating current LO setting\n");
cal = b43_calibrate_lo_setting(dev, &gphy->bbatt, &gphy->rfatt);
if (cal) {
list_add(&cal->list, &lo->calib_list);
b43_lo_write(dev, &cal->ctl);
} else
b43warn(dev->wl, "Failed to recalibrate current LO setting\n");
}
}
void b43_lo_g_cleanup(struct b43_wldev *dev)
{
struct b43_txpower_lo_control *lo = dev->phy.g->lo_control;
struct b43_lo_calib *cal, *tmp;
if (!lo)
return;
list_for_each_entry_safe(cal, tmp, &lo->calib_list, list) {
list_del(&cal->list);
kfree(cal);
}
}
/* LO Initialization */
void b43_lo_g_init(struct b43_wldev *dev)
{
if (b43_has_hardware_pctl(dev)) {
lo_read_power_vector(dev);
b43_gphy_dc_lt_init(dev, 1);
}
}
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