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

	if (radio->revision == 8)
		bcm43xx_phy_write(bcm, 0x0805, 0x3230);
	bcm43xx_phy_init_pctl(bcm);
	if (bcm->chip_id == 0x4306 && bcm->chip_package == 2) {
		bcm43xx_phy_write(bcm, 0x0429,
				  bcm43xx_phy_read(bcm, 0x0429) & 0xBFFF);
		bcm43xx_phy_write(bcm, 0x04C3,
				  bcm43xx_phy_read(bcm, 0x04C3) & 0x7FFF);
	}
}

static u16 bcm43xx_phy_lo_b_r15_loop(struct bcm43xx_private *bcm)
{
	int i;
	u16 ret = 0;
	unsigned long flags;

	local_irq_save(flags);
	for (i = 0; i < 10; i++){
		bcm43xx_phy_write(bcm, 0x0015, 0xAFA0);
		udelay(1);
		bcm43xx_phy_write(bcm, 0x0015, 0xEFA0);
		udelay(10);
		bcm43xx_phy_write(bcm, 0x0015, 0xFFA0);
		udelay(40);
		ret += bcm43xx_phy_read(bcm, 0x002C);
	}
	local_irq_restore(flags);
	bcm43xx_voluntary_preempt();

	return ret;
}

void bcm43xx_phy_lo_b_measure(struct bcm43xx_private *bcm)
{
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	u16 regstack[12] = { 0 };
	u16 mls;
	u16 fval;
	int i, j;

	regstack[0] = bcm43xx_phy_read(bcm, 0x0015);
	regstack[1] = bcm43xx_radio_read16(bcm, 0x0052) & 0xFFF0;

	if (radio->version == 0x2053) {
		regstack[2] = bcm43xx_phy_read(bcm, 0x000A);
		regstack[3] = bcm43xx_phy_read(bcm, 0x002A);
		regstack[4] = bcm43xx_phy_read(bcm, 0x0035);
		regstack[5] = bcm43xx_phy_read(bcm, 0x0003);
		regstack[6] = bcm43xx_phy_read(bcm, 0x0001);
		regstack[7] = bcm43xx_phy_read(bcm, 0x0030);

		regstack[8] = bcm43xx_radio_read16(bcm, 0x0043);
		regstack[9] = bcm43xx_radio_read16(bcm, 0x007A);
		regstack[10] = bcm43xx_read16(bcm, 0x03EC);
		regstack[11] = bcm43xx_radio_read16(bcm, 0x0052) & 0x00F0;

		bcm43xx_phy_write(bcm, 0x0030, 0x00FF);
		bcm43xx_write16(bcm, 0x03EC, 0x3F3F);
		bcm43xx_phy_write(bcm, 0x0035, regstack[4] & 0xFF7F);
		bcm43xx_radio_write16(bcm, 0x007A, regstack[9] & 0xFFF0);
	}
	bcm43xx_phy_write(bcm, 0x0015, 0xB000);
	bcm43xx_phy_write(bcm, 0x002B, 0x0004);

	if (radio->version == 0x2053) {
		bcm43xx_phy_write(bcm, 0x002B, 0x0203);
		bcm43xx_phy_write(bcm, 0x002A, 0x08A3);
	}

	phy->minlowsig[0] = 0xFFFF;

	for (i = 0; i < 4; i++) {
		bcm43xx_radio_write16(bcm, 0x0052, regstack[1] | i);
		bcm43xx_phy_lo_b_r15_loop(bcm);
	}
	for (i = 0; i < 10; i++) {
		bcm43xx_radio_write16(bcm, 0x0052, regstack[1] | i);
		mls = bcm43xx_phy_lo_b_r15_loop(bcm) / 10;
		if (mls < phy->minlowsig[0]) {
			phy->minlowsig[0] = mls;
			phy->minlowsigpos[0] = i;
		}
	}
	bcm43xx_radio_write16(bcm, 0x0052, regstack[1] | phy->minlowsigpos[0]);

	phy->minlowsig[1] = 0xFFFF;

	for (i = -4; i < 5; i += 2) {
		for (j = -4; j < 5; j += 2) {
			if (j < 0)
				fval = (0x0100 * i) + j + 0x0100;
			else
				fval = (0x0100 * i) + j;
			bcm43xx_phy_write(bcm, 0x002F, fval);
			mls = bcm43xx_phy_lo_b_r15_loop(bcm) / 10;
			if (mls < phy->minlowsig[1]) {
				phy->minlowsig[1] = mls;
				phy->minlowsigpos[1] = fval;
			}
		}
	}
	phy->minlowsigpos[1] += 0x0101;

	bcm43xx_phy_write(bcm, 0x002F, phy->minlowsigpos[1]);
	if (radio->version == 0x2053) {
		bcm43xx_phy_write(bcm, 0x000A, regstack[2]);
		bcm43xx_phy_write(bcm, 0x002A, regstack[3]);
		bcm43xx_phy_write(bcm, 0x0035, regstack[4]);
		bcm43xx_phy_write(bcm, 0x0003, regstack[5]);
		bcm43xx_phy_write(bcm, 0x0001, regstack[6]);
		bcm43xx_phy_write(bcm, 0x0030, regstack[7]);

		bcm43xx_radio_write16(bcm, 0x0043, regstack[8]);
		bcm43xx_radio_write16(bcm, 0x007A, regstack[9]);

		bcm43xx_radio_write16(bcm, 0x0052,
		                      (bcm43xx_radio_read16(bcm, 0x0052) & 0x000F)
				      | regstack[11]);

		bcm43xx_write16(bcm, 0x03EC, regstack[10]);
	}
	bcm43xx_phy_write(bcm, 0x0015, regstack[0]);
}

static inline
u16 bcm43xx_phy_lo_g_deviation_subval(struct bcm43xx_private *bcm, u16 control)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	u16 ret;
	unsigned long flags;

	local_irq_save(flags);
	if (phy->connected) {
		bcm43xx_phy_write(bcm, 0x15, 0xE300);
		control <<= 8;
		bcm43xx_phy_write(bcm, 0x0812, control | 0x00B0);
		udelay(5);
		bcm43xx_phy_write(bcm, 0x0812, control | 0x00B2);
		udelay(2);
		bcm43xx_phy_write(bcm, 0x0812, control | 0x00B3);
		udelay(4);
		bcm43xx_phy_write(bcm, 0x0015, 0xF300);
		udelay(8);
	} else {
		bcm43xx_phy_write(bcm, 0x0015, control | 0xEFA0);
		udelay(2);
		bcm43xx_phy_write(bcm, 0x0015, control | 0xEFE0);
		udelay(4);
		bcm43xx_phy_write(bcm, 0x0015, control | 0xFFE0);
		udelay(8);
	}
	ret = bcm43xx_phy_read(bcm, 0x002D);
	local_irq_restore(flags);
	bcm43xx_voluntary_preempt();

	return ret;
}

static u32 bcm43xx_phy_lo_g_singledeviation(struct bcm43xx_private *bcm, u16 control)
{
	int i;
	u32 ret = 0;

	for (i = 0; i < 8; i++)
		ret += bcm43xx_phy_lo_g_deviation_subval(bcm, control);

	return ret;
}

/* Write the LocalOscillator CONTROL */
static inline
void bcm43xx_lo_write(struct bcm43xx_private *bcm,
		      struct bcm43xx_lopair *pair)
{
	u16 value;

	value = (u8)(pair->low);
	value |= ((u8)(pair->high)) << 8;

#ifdef CONFIG_BCM43XX_DEBUG
	/* Sanity check. */
	if (pair->low < -8 || pair->low > 8 ||
	    pair->high < -8 || pair->high > 8) {
		printk(KERN_WARNING PFX
		       "WARNING: Writing invalid LOpair "
		       "(low: %d, high: %d, index: %lu)\n",
		       pair->low, pair->high,
		       (unsigned long)(pair - bcm43xx_current_phy(bcm)->_lo_pairs));
		dump_stack();
	}
#endif

	bcm43xx_phy_write(bcm, BCM43xx_PHY_G_LO_CONTROL, value);
}

static inline
struct bcm43xx_lopair * bcm43xx_find_lopair(struct bcm43xx_private *bcm,
					    u16 baseband_attenuation,
					    u16 radio_attenuation,
					    u16 tx)
{
	static const u8 dict[10] = { 11, 10, 11, 12, 13, 12, 13, 12, 13, 12 };
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);

	if (baseband_attenuation > 6)
		baseband_attenuation = 6;
	assert(radio_attenuation < 10);

	if (tx == 3) {
		return bcm43xx_get_lopair(phy,
					  radio_attenuation,
					  baseband_attenuation);
	}
	return bcm43xx_get_lopair(phy, dict[radio_attenuation], baseband_attenuation);
}

static inline
struct bcm43xx_lopair * bcm43xx_current_lopair(struct bcm43xx_private *bcm)
{
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);

	return bcm43xx_find_lopair(bcm,
				   radio->baseband_atten,
				   radio->radio_atten,
				   radio->txctl1);
}

/* Adjust B/G LO */
void bcm43xx_phy_lo_adjust(struct bcm43xx_private *bcm, int fixed)
{
	struct bcm43xx_lopair *pair;

	if (fixed) {
		/* Use fixed values. Only for initialization. */
		pair = bcm43xx_find_lopair(bcm, 2, 3, 0);
	} else
		pair = bcm43xx_current_lopair(bcm);
	bcm43xx_lo_write(bcm, pair);
}

static void bcm43xx_phy_lo_g_measure_txctl2(struct bcm43xx_private *bcm)
{
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	u16 txctl2 = 0, i;
	u32 smallest, tmp;

	bcm43xx_radio_write16(bcm, 0x0052, 0x0000);
	udelay(10);
	smallest = bcm43xx_phy_lo_g_singledeviation(bcm, 0);
	for (i = 0; i < 16; i++) {
		bcm43xx_radio_write16(bcm, 0x0052, i);
		udelay(10);
		tmp = bcm43xx_phy_lo_g_singledeviation(bcm, 0);
		if (tmp < smallest) {
			smallest = tmp;
			txctl2 = i;
		}
	}
	radio->txctl2 = txctl2;
}

static
void bcm43xx_phy_lo_g_state(struct bcm43xx_private *bcm,
			    const struct bcm43xx_lopair *in_pair,
			    struct bcm43xx_lopair *out_pair,
			    u16 r27)
{
	static const struct bcm43xx_lopair transitions[8] = {
		{ .high =  1,  .low =  1, },
		{ .high =  1,  .low =  0, },
		{ .high =  1,  .low = -1, },
		{ .high =  0,  .low = -1, },
		{ .high = -1,  .low = -1, },
		{ .high = -1,  .low =  0, },
		{ .high = -1,  .low =  1, },
		{ .high =  0,  .low =  1, },
	};
	struct bcm43xx_lopair lowest_transition = {
		.high = in_pair->high,
		.low = in_pair->low,
	};
	struct bcm43xx_lopair tmp_pair;
	struct bcm43xx_lopair transition;
	int i = 12;
	int state = 0;
	int found_lower;
	int j, begin, end;
	u32 lowest_deviation;
	u32 tmp;

	/* Note that in_pair and out_pair can point to the same pair. Be careful. */

	bcm43xx_lo_write(bcm, &lowest_transition);
	lowest_deviation = bcm43xx_phy_lo_g_singledeviation(bcm, r27);
	do {
		found_lower = 0;
		assert(state >= 0 && state <= 8);
		if (state == 0) {
			begin = 1;
			end = 8;
		} else if (state % 2 == 0) {
			begin = state - 1;
			end = state + 1;
		} else {
			begin = state - 2;
			end = state + 2;
		}
		if (begin < 1)
			begin += 8;
		if (end > 8)
			end -= 8;

		j = begin;
		tmp_pair.high = lowest_transition.high;
		tmp_pair.low = lowest_transition.low;
		while (1) {
			assert(j >= 1 && j <= 8);
			transition.high = tmp_pair.high + transitions[j - 1].high;
			transition.low = tmp_pair.low + transitions[j - 1].low;
			if ((abs(transition.low) < 9) && (abs(transition.high) < 9)) {
				bcm43xx_lo_write(bcm, &transition);
				tmp = bcm43xx_phy_lo_g_singledeviation(bcm, r27);
				if (tmp < lowest_deviation) {
					lowest_deviation = tmp;
					state = j;
					found_lower = 1;

					lowest_transition.high = transition.high;
					lowest_transition.low = transition.low;
				}
			}
			if (j == end)
				break;
			if (j == 8)
				j = 1;
			else
				j++;
		}
	} while (i-- && found_lower);

	out_pair->high = lowest_transition.high;
	out_pair->low = lowest_transition.low;
}

/* Set the baseband attenuation value on chip. */
void bcm43xx_phy_set_baseband_attenuation(struct bcm43xx_private *bcm,
					  u16 baseband_attenuation)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	u16 value;

	if (phy->analog == 0) {
		value = (bcm43xx_read16(bcm, 0x03E6) & 0xFFF0);
		value |= (baseband_attenuation & 0x000F);
		bcm43xx_write16(bcm, 0x03E6, value);
		return;
	}

	if (phy->analog > 1) {
		value = bcm43xx_phy_read(bcm, 0x0060) & ~0x003C;
		value |= (baseband_attenuation << 2) & 0x003C;
	} else {
		value = bcm43xx_phy_read(bcm, 0x0060) & ~0x0078;
		value |= (baseband_attenuation << 3) & 0x0078;
	}
	bcm43xx_phy_write(bcm, 0x0060, value);
}

/* http://bcm-specs.sipsolutions.net/LocalOscillator/Measure */
void bcm43xx_phy_lo_g_measure(struct bcm43xx_private *bcm)
{
	static const u8 pairorder[10] = { 3, 1, 5, 7, 9, 2, 0, 4, 6, 8 };
	const int is_initializing = (bcm43xx_status(bcm) == BCM43xx_STAT_INITIALIZING);
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	u16 h, i, oldi = 0, j;
	struct bcm43xx_lopair control;
	struct bcm43xx_lopair *tmp_control;
	u16 tmp;
	u16 regstack[16] = { 0 };
	u8 oldchannel;

	//XXX: What are these?
	u8 r27 = 0, r31;

	oldchannel = radio->channel;
	/* Setup */
	if (phy->connected) {
		regstack[0] = bcm43xx_phy_read(bcm, BCM43xx_PHY_G_CRS);
		regstack[1] = bcm43xx_phy_read(bcm, 0x0802);
		bcm43xx_phy_write(bcm, BCM43xx_PHY_G_CRS, regstack[0] & 0x7FFF);
		bcm43xx_phy_write(bcm, 0x0802, regstack[1] & 0xFFFC);
	}
	regstack[3] = bcm43xx_read16(bcm, 0x03E2);
	bcm43xx_write16(bcm, 0x03E2, regstack[3] | 0x8000);
	regstack[4] = bcm43xx_read16(bcm, BCM43xx_MMIO_CHANNEL_EXT);
	regstack[5] = bcm43xx_phy_read(bcm, 0x15);
	regstack[6] = bcm43xx_phy_read(bcm, 0x2A);
	regstack[7] = bcm43xx_phy_read(bcm, 0x35);
	regstack[8] = bcm43xx_phy_read(bcm, 0x60);
	regstack[9] = bcm43xx_radio_read16(bcm, 0x43);
	regstack[10] = bcm43xx_radio_read16(bcm, 0x7A);
	regstack[11] = bcm43xx_radio_read16(bcm, 0x52);
	if (phy->connected) {
		regstack[12] = bcm43xx_phy_read(bcm, 0x0811);
		regstack[13] = bcm43xx_phy_read(bcm, 0x0812);
		regstack[14] = bcm43xx_phy_read(bcm, 0x0814);
		regstack[15] = bcm43xx_phy_read(bcm, 0x0815);
	}
	bcm43xx_radio_selectchannel(bcm, 6, 0);
	if (phy->connected) {
		bcm43xx_phy_write(bcm, BCM43xx_PHY_G_CRS, regstack[0] & 0x7FFF);
		bcm43xx_phy_write(bcm, 0x0802, regstack[1] & 0xFFFC);
		bcm43xx_dummy_transmission(bcm);
	}
	bcm43xx_radio_write16(bcm, 0x0043, 0x0006);

	bcm43xx_phy_set_baseband_attenuation(bcm, 2);

	bcm43xx_write16(bcm, BCM43xx_MMIO_CHANNEL_EXT, 0x0000);
	bcm43xx_phy_write(bcm, 0x002E, 0x007F);
	bcm43xx_phy_write(bcm, 0x080F, 0x0078);
	bcm43xx_phy_write(bcm, 0x0035, regstack[7] & ~(1 << 7));