lo.c

linux内核源码

		     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, phy->lna_gain,
							phy->pga_gain,
							phy->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) || lo->rebuild))
					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_txpower_lo_control *lo = phy->lo_control;
	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) && !lo->rebuild)
		d.state_val_multiplier = 3;

	memcpy(&d.min_loctl, loctl, sizeof(struct b43_loctl));
	if (has_loopback_gain(phy) && lo->rebuild)
		max_repeat = 4;
	do {
		b43_lo_write(dev, &d.min_loctl);
		feedth = lo_measure_feedthrough(dev, phy->lna_gain,
						phy->pga_gain,
						phy->trsw_rx_gain);
		if (!lo->rebuild && feedth < 0x258) {
			if (feedth >= 0x12C)
				*max_rx_gain += 6;
			else
				*max_rx_gain += 3;
			feedth = lo_measure_feedthrough(dev, phy->lna_gain,
							phy->pga_gain,
							phy->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);
}

#if B43_CALIB_ALL_LOCTLS
static const struct b43_rfatt b43_full_rfatt_list_items[] = {
	{ .att = 0, .with_padmix = 0, },
	{ .att = 1, .with_padmix = 0, },
	{ .att = 2, .with_padmix = 0, },
	{ .att = 3, .with_padmix = 0, },
	{ .att = 4, .with_padmix = 0, },
	{ .att = 5, .with_padmix = 0, },
	{ .att = 6, .with_padmix = 0, },
	{ .att = 7, .with_padmix = 0, },
	{ .att = 8, .with_padmix = 0, },
	{ .att = 9, .with_padmix = 0, },
	{ .att = 10, .with_padmix = 0, },
	{ .att = 11, .with_padmix = 0, },
	{ .att = 12, .with_padmix = 0, },
	{ .att = 13, .with_padmix = 0, },
	{ .att = 14, .with_padmix = 0, },
	{ .att = 15, .with_padmix = 0, },
	{ .att = 0, .with_padmix = 1, },
	{ .att = 1, .with_padmix = 1, },
	{ .att = 2, .with_padmix = 1, },
	{ .att = 3, .with_padmix = 1, },
	{ .att = 4, .with_padmix = 1, },
	{ .att = 5, .with_padmix = 1, },
	{ .att = 6, .with_padmix = 1, },
	{ .att = 7, .with_padmix = 1, },
	{ .att = 8, .with_padmix = 1, },
	{ .att = 9, .with_padmix = 1, },
	{ .att = 10, .with_padmix = 1, },
	{ .att = 11, .with_padmix = 1, },
	{ .att = 12, .with_padmix = 1, },
	{ .att = 13, .with_padmix = 1, },
	{ .att = 14, .with_padmix = 1, },
	{ .att = 15, .with_padmix = 1, },
};
static const struct b43_rfatt_list b43_full_rfatt_list = {
	.list		= b43_full_rfatt_list_items,
	.len		= ARRAY_SIZE(b43_full_rfatt_list_items),
};

static const struct b43_bbatt b43_full_bbatt_list_items[] = {
	{ .att = 0, },
	{ .att = 1, },
	{ .att = 2, },
	{ .att = 3, },
	{ .att = 4, },
	{ .att = 5, },
	{ .att = 6, },
	{ .att = 7, },
	{ .att = 8, },
	{ .att = 9, },
	{ .att = 10, },
	{ .att = 11, },
};
static const struct b43_bbatt_list b43_full_bbatt_list = {
	.list		= b43_full_bbatt_list_items,
	.len		= ARRAY_SIZE(b43_full_bbatt_list_items),
};
#endif /* B43_CALIB_ALL_LOCTLS */

static void lo_measure(struct b43_wldev *dev)
{
	struct b43_phy *phy = &dev->phy;
	struct b43_txpower_lo_control *lo = phy->lo_control;
	struct b43_loctl loctl = {
		.i = 0,
		.q = 0,
	};
	struct b43_loctl *ploctl;
	int max_rx_gain;
	int rfidx, bbidx;
	const struct b43_bbatt_list *bbatt_list;
	const struct b43_rfatt_list *rfatt_list;

	/* Values from the "TXCTL Register and Value Table" */
	u16 txctl_reg;
	u16 txctl_value;
	u16 pad_mix_gain;

	bbatt_list = &lo->bbatt_list;
	rfatt_list = &lo->rfatt_list;
#if B43_CALIB_ALL_LOCTLS
	bbatt_list = &b43_full_bbatt_list;
	rfatt_list = &b43_full_rfatt_list;
#endif

	txctl_reg = lo_txctl_register_table(dev, &txctl_value, &pad_mix_gain);

	for (rfidx = 0; rfidx < rfatt_list->len; rfidx++) {

		b43_radio_write16(dev, 0x43, (b43_radio_read16(dev, 0x43)
					      & 0xFFF0) |
				  rfatt_list->list[rfidx].att);
		b43_radio_write16(dev, txctl_reg,
				  (b43_radio_read16(dev, txctl_reg)
				   & ~txctl_value)
				  | (rfatt_list->list[rfidx].with_padmix ?
				     txctl_value : 0));

		for (bbidx = 0; bbidx < bbatt_list->len; bbidx++) {
			if (lo->rebuild) {
#if B43_CALIB_ALL_LOCTLS
				ploctl = b43_get_lo_g_ctl(dev,
							  &rfatt_list->list[rfidx],
							  &bbatt_list->list[bbidx]);
#else
				ploctl = b43_get_lo_g_ctl_nopadmix(dev,
								   &rfatt_list->
								   list[rfidx],
								   &bbatt_list->
								   list[bbidx]);
#endif
			} else {
				ploctl = b43_get_lo_g_ctl(dev,
							  &rfatt_list->list[rfidx],
							  &bbatt_list->list[bbidx]);
				if (!ploctl->used)
					continue;
			}
			memcpy(&loctl, ploctl, sizeof(loctl));
			loctl.i = 0;
			loctl.q = 0;

			max_rx_gain = rfatt_list->list[rfidx].att * 2;
			max_rx_gain += bbatt_list->list[bbidx].att / 2;
			if (rfatt_list->list[rfidx].with_padmix)
				max_rx_gain -= pad_mix_gain;
			if (has_loopback_gain(phy))
				max_rx_gain += phy->max_lb_gain;
			lo_measure_gain_values(dev, max_rx_gain,
					       has_loopback_gain(phy));

			b43_phy_set_baseband_attenuation(dev,
							 bbatt_list->list[bbidx].att);
			lo_probe_loctls_statemachine(dev, &loctl, &max_rx_gain);
			if (phy->type == B43_PHYTYPE_B) {
				loctl.i++;
				loctl.q++;
			}
			b43_loctl_set_calibrated(&loctl, 1);
			memcpy(ploctl, &loctl, sizeof(loctl));
		}
	}
}

#if B43_DEBUG
static void do_validate_loctl(struct b43_wldev *dev, struct b43_loctl *control)
{
	const int is_initializing = (b43_status(dev) == B43_STAT_UNINIT);
	int i = control->i;
	int q = control->q;

	if (b43_loctl_is_calibrated(control)) {
		if ((abs(i) > 16) || (abs(q) > 16))
			goto error;
	} else {
		if (control->used)
			goto error;
		if (dev->phy.lo_control->rebuild) {
			control->i = 0;
			control->q = 0;
			if ((i != B43_LOCTL_POISON) ||
			    (q != B43_LOCTL_POISON))
				goto error;
		}
	}
	if (is_initializing && control->used)
		goto error;

	return;
error:
	b43err(dev->wl, "LO control pair validation failed "
	       "(I: %d, Q: %d, used %u, calib: %u, initing: %d)\n",
	       i, q, control->used,
	       b43_loctl_is_calibrated(control),
	       is_initializing);
}

static void validate_all_loctls(struct b43_wldev *dev)
{
	b43_call_for_each_loctl(dev, do_validate_loctl);
}

static void do_reset_calib(struct b43_wldev *dev, struct b43_loctl *control)
{
	if (dev->phy.lo_control->rebuild ||
	    control->used) {
		b43_loctl_set_calibrated(control, 0);
		control->i = B43_LOCTL_POISON;
		control->q = B43_LOCTL_POISON;
	}
}

static void reset_all_loctl_calibration_states(struct b43_wldev *dev)
{
	b43_call_for_each_loctl(dev, do_reset_calib);
}

#else /* B43_DEBUG */
static inline void validate_all_loctls(struct b43_wldev *dev) { }
static inline void reset_all_loctl_calibration_states(struct b43_wldev *dev) { }
#endif /* B43_DEBUG */

void b43_lo_g_measure(struct b43_wldev *dev)
{
	struct b43_phy *phy = &dev->phy;
	struct lo_g_saved_values uninitialized_var(sav);

	B43_WARN_ON((phy->type != B43_PHYTYPE_B) &&
		    (phy->type != B43_PHYTYPE_G));

	sav.old_channel = phy->channel;
	lo_measure_setup(dev, &sav);
	reset_all_loctl_calibration_states(dev);
	lo_measure(dev);
	lo_measure_restore(dev, &sav);

	validate_all_loctls(dev);

	phy->lo_control->lo_measured = 1;
	phy->lo_control->rebuild = 0;
}

#if B43_DEBUG
static void validate_loctl_calibration(struct b43_wldev *dev,
				       struct b43_loctl *loctl,
				       struct b43_rfatt *rfatt,
				       struct b43_bbatt *bbatt)
{
	if (b43_loctl_is_calibrated(loctl))
		return;
	if (!dev->phy.lo_control->lo_measured) {
		/* On init we set the attenuation values before we
		 * calibrated the LO. I guess that's OK. */
		return;
	}
	b43err(dev->wl, "Adjusting Local Oscillator to an uncalibrated "
	       "control pair: rfatt=%u,%spadmix bbatt=%u\n",
	       rfatt->att,
	       (rfatt->with_padmix) ? "" : "no-",
	       bbatt->att);
}
#else
static inline void validate_loctl_calibration(struct b43_wldev *dev,
					      struct b43_loctl *loctl,
					      struct b43_rfatt *rfatt,
					      struct b43_bbatt *bbatt)
{
}
#endif

static inline void fixup_rfatt_for_txcontrol(struct b43_rfatt *rf,
					     u8 tx_control)
{
	if (tx_control & B43_TXCTL_TXMIX) {
		if (rf->att < 5)
			rf->att = 4;
	}
}

void b43_lo_g_adjust(struct b43_wldev *dev)
{
	struct b43_phy *phy = &dev->phy;
	struct b43_rfatt rf;
	struct b43_loctl *loctl;

	memcpy(&rf, &phy->rfatt, sizeof(rf));
	fixup_rfatt_for_txcontrol(&rf, phy->tx_control);

	loctl = b43_get_lo_g_ctl(dev, &rf, &phy->bbatt);
	validate_loctl_calibration(dev, loctl, &rf, &phy->bbatt);
	b43_lo_write(dev, loctl);
}

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_loctl *loctl;

	memset(&rf, 0, sizeof(rf));
	memset(&bb, 0, sizeof(bb));
	rf.att = rfatt;
	bb.att = bbatt;
	fixup_rfatt_for_txcontrol(&rf, tx_control);
	loctl = b43_get_lo_g_ctl(dev, &rf, &bb);
	validate_loctl_calibration(dev, loctl, &rf, &bb);
	b43_lo_write(dev, loctl);
}

static void do_mark_unused(struct b43_wldev *dev, struct b43_loctl *control)
{
	control->used = 0;
}

void b43_lo_g_ctl_mark_all_unused(struct b43_wldev *dev)
{
	struct b43_phy *phy = &dev->phy;
	struct b43_txpower_lo_control *lo = phy->lo_control;

	b43_call_for_each_loctl(dev, do_mark_unused);
	lo->rebuild = 1;
}

void b43_lo_g_ctl_mark_cur_used(struct b43_wldev *dev)
{
	struct b43_phy *phy = &dev->phy;
	struct b43_rfatt rf;

	memcpy(&rf, &phy->rfatt, sizeof(rf));
	fixup_rfatt_for_txcontrol(&rf, phy->tx_control);

	b43_get_lo_g_ctl(dev, &rf, &phy->bbatt)->used = 1;
}