bcm43xx_phy.c

无线网卡驱动,有很好的参考价值,在linux_2.6.21下可以直接使用,如果在其他平台,可以参考移植

	bcm43xx_radio_write16(bcm, 0x007A, regstack[10] & 0xFFF0);
	bcm43xx_phy_write(bcm, 0x002B, 0x0203);
	bcm43xx_phy_write(bcm, 0x002A, 0x08A3);
	if (phy->connected) {
		bcm43xx_phy_write(bcm, 0x0814, regstack[14] | 0x0003);
		bcm43xx_phy_write(bcm, 0x0815, regstack[15] & 0xFFFC);
		bcm43xx_phy_write(bcm, 0x0811, 0x01B3);
		bcm43xx_phy_write(bcm, 0x0812, 0x00B2);
	}
	if (is_initializing)
		bcm43xx_phy_lo_g_measure_txctl2(bcm);
	bcm43xx_phy_write(bcm, 0x080F, 0x8078);

	/* Measure */
	control.low = 0;
	control.high = 0;
	for (h = 0; h < 10; h++) {
		/* Loop over each possible RadioAttenuation (0-9) */
		i = pairorder[h];
		if (is_initializing) {
			if (i == 3) {
				control.low = 0;
				control.high = 0;
			} else if (((i % 2 == 1) && (oldi % 2 == 1)) ||
				  ((i % 2 == 0) && (oldi % 2 == 0))) {
				tmp_control = bcm43xx_get_lopair(phy, oldi, 0);
				memcpy(&control, tmp_control, sizeof(control));
			} else {
				tmp_control = bcm43xx_get_lopair(phy, 3, 0);
				memcpy(&control, tmp_control, sizeof(control));
			}
		}
		/* Loop over each possible BasebandAttenuation/2 */
		for (j = 0; j < 4; j++) {
			if (is_initializing) {
				tmp = i * 2 + j;
				r27 = 0;
				r31 = 0;
				if (tmp > 14) {
					r31 = 1;
					if (tmp > 17)
						r27 = 1;
					if (tmp > 19)
						r27 = 2;
				}
			} else {
				tmp_control = bcm43xx_get_lopair(phy, i, j * 2);
				if (!tmp_control->used)
					continue;
				memcpy(&control, tmp_control, sizeof(control));
				r27 = 3;
				r31 = 0;
			}
			bcm43xx_radio_write16(bcm, 0x43, i);
			bcm43xx_radio_write16(bcm, 0x52, radio->txctl2);
			udelay(10);
			bcm43xx_voluntary_preempt();

			bcm43xx_phy_set_baseband_attenuation(bcm, j * 2);

			tmp = (regstack[10] & 0xFFF0);
			if (r31)
				tmp |= 0x0008;
			bcm43xx_radio_write16(bcm, 0x007A, tmp);

			tmp_control = bcm43xx_get_lopair(phy, i, j * 2);
			bcm43xx_phy_lo_g_state(bcm, &control, tmp_control, r27);
		}
		oldi = i;
	}
	/* Loop over each possible RadioAttenuation (10-13) */
	for (i = 10; i < 14; i++) {
		/* Loop over each possible BasebandAttenuation/2 */
		for (j = 0; j < 4; j++) {
			if (is_initializing) {
				tmp_control = bcm43xx_get_lopair(phy, i - 9, j * 2);
				memcpy(&control, tmp_control, sizeof(control));
				tmp = (i - 9) * 2 + j - 5;//FIXME: This is wrong, as the following if statement can never trigger.
				r27 = 0;
				r31 = 0;
				if (tmp > 14) {
					r31 = 1;
					if (tmp > 17)
						r27 = 1;
					if (tmp > 19)
						r27 = 2;
				}
			} else {
				tmp_control = bcm43xx_get_lopair(phy, i - 9, j * 2);
				if (!tmp_control->used)
					continue;
				memcpy(&control, tmp_control, sizeof(control));
				r27 = 3;
				r31 = 0;
			}
			bcm43xx_radio_write16(bcm, 0x43, i - 9);
			bcm43xx_radio_write16(bcm, 0x52,
					      radio->txctl2
					      | (3/*txctl1*/ << 4));//FIXME: shouldn't txctl1 be zero here and 3 in the loop above?
			udelay(10);
			bcm43xx_voluntary_preempt();

			bcm43xx_phy_set_baseband_attenuation(bcm, j * 2);

			tmp = (regstack[10] & 0xFFF0);
			if (r31)
				tmp |= 0x0008;
			bcm43xx_radio_write16(bcm, 0x7A, tmp);

			tmp_control = bcm43xx_get_lopair(phy, i, j * 2);
			bcm43xx_phy_lo_g_state(bcm, &control, tmp_control, r27);
		}
	}

	/* Restoration */
	if (phy->connected) {
		bcm43xx_phy_write(bcm, 0x0015, 0xE300);
		bcm43xx_phy_write(bcm, 0x0812, (r27 << 8) | 0xA0);
		udelay(5);
		bcm43xx_phy_write(bcm, 0x0812, (r27 << 8) | 0xA2);
		udelay(2);
		bcm43xx_phy_write(bcm, 0x0812, (r27 << 8) | 0xA3);
		bcm43xx_voluntary_preempt();
	} else
		bcm43xx_phy_write(bcm, 0x0015, r27 | 0xEFA0);
	bcm43xx_phy_lo_adjust(bcm, is_initializing);
	bcm43xx_phy_write(bcm, 0x002E, 0x807F);
	if (phy->connected)
		bcm43xx_phy_write(bcm, 0x002F, 0x0202);
	else
		bcm43xx_phy_write(bcm, 0x002F, 0x0101);
	bcm43xx_write16(bcm, BCM43xx_MMIO_CHANNEL_EXT, regstack[4]);
	bcm43xx_phy_write(bcm, 0x0015, regstack[5]);
	bcm43xx_phy_write(bcm, 0x002A, regstack[6]);
	bcm43xx_phy_write(bcm, 0x0035, regstack[7]);
	bcm43xx_phy_write(bcm, 0x0060, regstack[8]);
	bcm43xx_radio_write16(bcm, 0x0043, regstack[9]);
	bcm43xx_radio_write16(bcm, 0x007A, regstack[10]);
	regstack[11] &= 0x00F0;
	regstack[11] |= (bcm43xx_radio_read16(bcm, 0x52) & 0x000F);
	bcm43xx_radio_write16(bcm, 0x52, regstack[11]);
	bcm43xx_write16(bcm, 0x03E2, regstack[3]);
	if (phy->connected) {
		bcm43xx_phy_write(bcm, 0x0811, regstack[12]);
		bcm43xx_phy_write(bcm, 0x0812, regstack[13]);
		bcm43xx_phy_write(bcm, 0x0814, regstack[14]);
		bcm43xx_phy_write(bcm, 0x0815, regstack[15]);
		bcm43xx_phy_write(bcm, BCM43xx_PHY_G_CRS, regstack[0]);
		bcm43xx_phy_write(bcm, 0x0802, regstack[1]);
	}
	bcm43xx_radio_selectchannel(bcm, oldchannel, 1);

#ifdef CONFIG_BCM43XX_DEBUG
	{
		/* Sanity check for all lopairs. */
		for (i = 0; i < BCM43xx_LO_COUNT; i++) {
			tmp_control = phy->_lo_pairs + i;
			if (tmp_control->low < -8 || tmp_control->low > 8 ||
			    tmp_control->high < -8 || tmp_control->high > 8) {
				printk(KERN_WARNING PFX
				       "WARNING: Invalid LOpair (low: %d, high: %d, index: %d)\n",
				       tmp_control->low, tmp_control->high, i);
			}
		}
	}
#endif /* CONFIG_BCM43XX_DEBUG */
}

static
void bcm43xx_phy_lo_mark_current_used(struct bcm43xx_private *bcm)
{
	struct bcm43xx_lopair *pair;

	pair = bcm43xx_current_lopair(bcm);
	pair->used = 1;
}

void bcm43xx_phy_lo_mark_all_unused(struct bcm43xx_private *bcm)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	struct bcm43xx_lopair *pair;
	int i;

	for (i = 0; i < BCM43xx_LO_COUNT; i++) {
		pair = phy->_lo_pairs + i;
		pair->used = 0;
	}
}

/* http://bcm-specs.sipsolutions.net/EstimatePowerOut
 * This function converts a TSSI value to dBm in Q5.2
 */
static s8 bcm43xx_phy_estimate_power_out(struct bcm43xx_private *bcm, s8 tssi)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	s8 dbm = 0;
	s32 tmp;

	tmp = phy->idle_tssi;
	tmp += tssi;
	tmp -= phy->savedpctlreg;

	switch (phy->type) {
		case BCM43xx_PHYTYPE_A:
			tmp += 0x80;
			tmp = limit_value(tmp, 0x00, 0xFF);
			dbm = phy->tssi2dbm[tmp];
			TODO(); //TODO: There's a FIXME on the specs
			break;
		case BCM43xx_PHYTYPE_B:
		case BCM43xx_PHYTYPE_G:
			tmp = limit_value(tmp, 0x00, 0x3F);
			dbm = phy->tssi2dbm[tmp];
			break;
		default:
			assert(0);
	}

	return dbm;
}

/* http://bcm-specs.sipsolutions.net/RecalculateTransmissionPower */
void bcm43xx_phy_xmitpower(struct bcm43xx_private *bcm)
{
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	
	if (phy->savedpctlreg == 0xFFFF)
		return;
	if ((bcm->board_type == 0x0416) &&
	    (bcm->board_vendor == PCI_VENDOR_ID_BROADCOM))
		return;
	
	switch (phy->type) {
	case BCM43xx_PHYTYPE_A: {

		TODO(); //TODO: Nothing for A PHYs yet :-/

		break;
	}
	case BCM43xx_PHYTYPE_B:
	case BCM43xx_PHYTYPE_G: {
		u16 tmp;
		u16 txpower;
		s8 v0, v1, v2, v3;
		s8 average;
		u8 max_pwr;
		s16 desired_pwr, estimated_pwr, pwr_adjust;
		s16 radio_att_delta, baseband_att_delta;
		s16 radio_attenuation, baseband_attenuation;
		unsigned long phylock_flags;

		tmp = bcm43xx_shm_read16(bcm, BCM43xx_SHM_SHARED, 0x0058);
		v0 = (s8)(tmp & 0x00FF);
		v1 = (s8)((tmp & 0xFF00) >> 8);
		tmp = bcm43xx_shm_read16(bcm, BCM43xx_SHM_SHARED, 0x005A);
		v2 = (s8)(tmp & 0x00FF);
		v3 = (s8)((tmp & 0xFF00) >> 8);
		tmp = 0;

		if (v0 == 0x7F || v1 == 0x7F || v2 == 0x7F || v3 == 0x7F) {
			tmp = bcm43xx_shm_read16(bcm, BCM43xx_SHM_SHARED, 0x0070);
			v0 = (s8)(tmp & 0x00FF);
			v1 = (s8)((tmp & 0xFF00) >> 8);
			tmp = bcm43xx_shm_read16(bcm, BCM43xx_SHM_SHARED, 0x0072);
			v2 = (s8)(tmp & 0x00FF);
			v3 = (s8)((tmp & 0xFF00) >> 8);
			if (v0 == 0x7F || v1 == 0x7F || v2 == 0x7F || v3 == 0x7F)
				return;
			v0 = (v0 + 0x20) & 0x3F;
			v1 = (v1 + 0x20) & 0x3F;
			v2 = (v2 + 0x20) & 0x3F;
			v3 = (v3 + 0x20) & 0x3F;
			tmp = 1;
		}
		bcm43xx_radio_clear_tssi(bcm);

		average = (v0 + v1 + v2 + v3 + 2) / 4;

		if (tmp && (bcm43xx_shm_read16(bcm, BCM43xx_SHM_SHARED, 0x005E) & 0x8))
			average -= 13;

		estimated_pwr = bcm43xx_phy_estimate_power_out(bcm, average);

		max_pwr = bcm->sprom.maxpower_bgphy;

		if ((bcm->sprom.boardflags & BCM43xx_BFL_PACTRL) &&
		    (phy->type == BCM43xx_PHYTYPE_G))
			max_pwr -= 0x3;

		/*TODO:
		max_pwr = min(REG - bcm->sprom.antennagain_bgphy - 0x6, max_pwr)
			where REG is the max power as per the regulatory domain
		*/

		desired_pwr = limit_value(radio->txpower_desired, 0, max_pwr);
		/* Check if we need to adjust the current power. */
		pwr_adjust = desired_pwr - estimated_pwr;
		radio_att_delta = -(pwr_adjust + 7) >> 3;
		baseband_att_delta = -(pwr_adjust >> 1) - (4 * radio_att_delta);
		if ((radio_att_delta == 0) && (baseband_att_delta == 0)) {
			bcm43xx_phy_lo_mark_current_used(bcm);
			return;
		}

		/* Calculate the new attenuation values. */
		baseband_attenuation = radio->baseband_atten;
		baseband_attenuation += baseband_att_delta;
		radio_attenuation = radio->radio_atten;
		radio_attenuation += radio_att_delta;

		/* Get baseband and radio attenuation values into their permitted ranges.
		 * baseband 0-11, radio 0-9.
		 * Radio attenuation affects power level 4 times as much as baseband.
		 */
		if (radio_attenuation < 0) {
			baseband_attenuation -= (4 * -radio_attenuation);
			radio_attenuation = 0;
		} else if (radio_attenuation > 9) {
			baseband_attenuation += (4 * (radio_attenuation - 9));
			radio_attenuation = 9;
		} else {
			while (baseband_attenuation < 0 && radio_attenuation > 0) {
				baseband_attenuation += 4;
				radio_attenuation--;
			}
			while (baseband_attenuation > 11 && radio_attenuation < 9) {
				baseband_attenuation -= 4;
				radio_attenuation++;
			}
		}
		baseband_attenuation = limit_value(baseband_attenuation, 0, 11);

		txpower = radio->txctl1;
		if ((radio->version == 0x2050) && (radio->revision == 2)) {
			if (radio_attenuation <= 1) {
				if (txpower == 0) {
					txpower = 3;
					radio_attenuation += 2;
					baseband_attenuation += 2;
				} else if (bcm->sprom.boardflags & BCM43xx_BFL_PACTRL) {
					baseband_attenuation += 4 * (radio_attenuation - 2);
					radio_attenuation = 2;
				}
			} else if (radio_attenuation > 4 && txpower != 0) {
				txpower = 0;
				if (baseband_attenuation < 3) {
					radio_attenuation -= 3;
					baseband_attenuation += 2;
				} else {
					radio_attenuation -= 2;
					baseband_attenuation -= 2;
				}
			}
		}
		radio->txctl1 = txpower;
		baseband_attenuation = limit_value(baseband_attenuation, 0, 11);
		radio_attenuation = limit_value(radio_attenuation, 0, 9);

		bcm43xx_phy_lock(bcm, phylock_flags);
		bcm43xx_radio_lock(bcm);
		bcm43xx_radio_set_txpower_bg(bcm, baseband_attenuation,
					     radio_attenuation, txpower);
		bcm43xx_phy_lo_mark_current_used(bcm);
		bcm43xx_radio_unlock(bcm);
		bcm43xx_phy_unlock(bcm, phylock_flags);
		break;
	}
	default:
		assert(0);
	}
}

static inline
s32 bcm43xx_tssi2dbm_ad(s32 num, s32 den)
{
	if (num < 0)
		return num/den;
	else
		return (num+den/2)/den;
}

static inline
s8 bcm43xx_tssi2dbm_entry(s8 entry [], u8 index, s16 pab0, s16 pab1, s16 pab2)
{
	s32 m1, m2, f = 256, q, delta;
	s8 i = 0;
	
	m1 = bcm43xx_tssi2dbm_ad(16 * pab0 + index * pab1, 32);
	m2 = max(bcm43xx_tssi2dbm_ad(32768 + index * pab2, 256), 1);
	do {
		if (i > 15)
			return -EINVAL;
		q = bcm43xx_tssi2dbm_ad(f * 4096 -
					bcm43xx_tssi2dbm_ad(m2 * f, 16) * f, 2048);
		delta = abs(q - f);
		f = q;
		i++;
	} while (delta >= 2);
	entry[index] = limit_value(bcm43xx_tssi2dbm_ad(m1 * f, 8192), -127, 128);
	return 0;
}

/* http://bcm-specs.sipsolutions.net/TSSI_to_DBM_Table */
int bcm43xx_phy_init_tssi2dbm_table(struct bcm43xx_private *bcm)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	s16 pab0, pab1, pab2;
	u8 idx;
	s8 *dyn_tssi2dbm;
	
	if (phy->type == BCM43xx_PHYTYPE_A) {
		pab0 = (s16)(bcm->sprom.pa1b0);
		pab1 = (s16)(bcm->sprom.pa1b1);
		pab2 = (s16)(bcm->sprom.pa1b2);
	} else {
		pab0 = (s16)(bcm->sprom.pa0b0);
		pab1 = (s16)(bcm->sprom.pa0b1);
		pab2 = (s16)(bcm->sprom.pa0b2);
	}

	if ((bcm->chip_id == 0x4301) &