e1000_mac.c

Intel 82546系列lan driver源码

	/* Get the SW semaphore */
	while (i < timeout) {
		swsm = er32(SWSM);
		if (!(swsm & E1000_SWSM_SMBI))
			break;

		udelay(50);
		i++;
	}

	if (i == timeout) {
		e_dbg("Driver can't access device - SMBI bit is set.\n");
		ret_val = -E1000_ERR_NVM;
		goto out;
	}

	/* Get the FW semaphore. */
	for (i = 0; i < timeout; i++) {
		swsm = er32(SWSM);
		ew32(SWSM, swsm | E1000_SWSM_SWESMBI);

		/* Semaphore acquired if bit latched */
		if (er32(SWSM) & E1000_SWSM_SWESMBI)
			break;

		udelay(50);
	}

	if (i == timeout) {
		/* Release semaphores */
		e1000e_put_hw_semaphore(hw);
		e_dbg("Driver can't access the NVM\n");
		ret_val = -E1000_ERR_NVM;
		goto out;
	}

out:
	return ret_val;
}

/**
 *  e1000e_put_hw_semaphore - Release hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Release hardware semaphore used to access the PHY or NVM
 **/
void e1000e_put_hw_semaphore(struct e1000_hw *hw)
{
	u32 swsm;

	swsm = er32(SWSM);
	swsm &= ~(E1000_SWSM_SMBI | E1000_SWSM_SWESMBI);
	ew32(SWSM, swsm);
}
/**
 *  e1000e_get_auto_rd_done - Check for auto read completion
 *  @hw: pointer to the HW structure
 *
 *  Check EEPROM for Auto Read done bit.
 **/
s32 e1000e_get_auto_rd_done(struct e1000_hw *hw)
{
	s32 i = 0;
	s32 ret_val = E1000_SUCCESS;

	while (i < AUTO_READ_DONE_TIMEOUT) {
		if (er32(EECD) & E1000_EECD_AUTO_RD)
			break;
		msleep(1);
		i++;
	}

	if (i == AUTO_READ_DONE_TIMEOUT) {
		e_dbg("Auto read by HW from NVM has not completed.\n");
		ret_val = -E1000_ERR_RESET;
		goto out;
	}

out:
	return ret_val;
}

/**
 *  e1000e_valid_led_default - Verify a valid default LED config
 *  @hw: pointer to the HW structure
 *  @data: pointer to the NVM (EEPROM)
 *
 *  Read the EEPROM for the current default LED configuration.  If the
 *  LED configuration is not valid, set to a valid LED configuration.
 **/
s32 e1000e_valid_led_default(struct e1000_hw *hw, u16 *data)
{
	s32 ret_val;

	ret_val = e1000_read_nvm(hw, NVM_ID_LED_SETTINGS, 1, data);
	if (ret_val) {
		e_dbg("NVM Read Error\n");
		goto out;
	}

	if (*data == ID_LED_RESERVED_0000 || *data == ID_LED_RESERVED_FFFF)
		*data = ID_LED_DEFAULT;

out:
	return ret_val;
}

/**
 *  e1000e_id_led_init -
 *  @hw: pointer to the HW structure
 *
 **/
s32 e1000e_id_led_init(struct e1000_hw *hw)
{
	struct e1000_mac_info *mac = &hw->mac;
	s32 ret_val;
	const u32 ledctl_mask = 0x000000FF;
	const u32 ledctl_on = E1000_LEDCTL_MODE_LED_ON;
	const u32 ledctl_off = E1000_LEDCTL_MODE_LED_OFF;
	u16 data, i, temp;
	const u16 led_mask = 0x0F;

	ret_val = hw->nvm.ops.valid_led_default(hw, &data);
	if (ret_val)
		goto out;

	mac->ledctl_default = er32(LEDCTL);
	mac->ledctl_mode1 = mac->ledctl_default;
	mac->ledctl_mode2 = mac->ledctl_default;

	for (i = 0; i < 4; i++) {
		temp = (data >> (i << 2)) & led_mask;
		switch (temp) {
		case ID_LED_ON1_DEF2:
		case ID_LED_ON1_ON2:
		case ID_LED_ON1_OFF2:
			mac->ledctl_mode1 &= ~(ledctl_mask << (i << 3));
			mac->ledctl_mode1 |= ledctl_on << (i << 3);
			break;
		case ID_LED_OFF1_DEF2:
		case ID_LED_OFF1_ON2:
		case ID_LED_OFF1_OFF2:
			mac->ledctl_mode1 &= ~(ledctl_mask << (i << 3));
			mac->ledctl_mode1 |= ledctl_off << (i << 3);
			break;
		default:
			/* Do nothing */
			break;
		}
		switch (temp) {
		case ID_LED_DEF1_ON2:
		case ID_LED_ON1_ON2:
		case ID_LED_OFF1_ON2:
			mac->ledctl_mode2 &= ~(ledctl_mask << (i << 3));
			mac->ledctl_mode2 |= ledctl_on << (i << 3);
			break;
		case ID_LED_DEF1_OFF2:
		case ID_LED_ON1_OFF2:
		case ID_LED_OFF1_OFF2:
			mac->ledctl_mode2 &= ~(ledctl_mask << (i << 3));
			mac->ledctl_mode2 |= ledctl_off << (i << 3);
			break;
		default:
			/* Do nothing */
			break;
		}
	}

out:
	return ret_val;
}

/**
 *  e1000_setup_led_generic - Configures SW controllable LED
 *  @hw: pointer to the HW structure
 *
 *  This prepares the SW controllable LED for use and saves the current state
 *  of the LED so it can be later restored.
 **/
s32 e1000_setup_led_generic(struct e1000_hw *hw)
{
	u32 ledctl;
	s32 ret_val = E1000_SUCCESS;

	if (hw->mac.ops.setup_led != e1000_setup_led_generic) {
		ret_val = -E1000_ERR_CONFIG;
		goto out;
	}

	if (hw->phy.media_type == e1000_media_type_fiber) {
		ledctl = er32(LEDCTL);
		hw->mac.ledctl_default = ledctl;
		/* Turn off LED0 */
		ledctl &= ~(E1000_LEDCTL_LED0_IVRT |
		            E1000_LEDCTL_LED0_BLINK |
		            E1000_LEDCTL_LED0_MODE_MASK);
		ledctl |= (E1000_LEDCTL_MODE_LED_OFF <<
		           E1000_LEDCTL_LED0_MODE_SHIFT);
		ew32(LEDCTL, ledctl);
	} else if (hw->phy.media_type == e1000_media_type_copper) {
		ew32(LEDCTL, hw->mac.ledctl_mode1);
	}

out:
	return ret_val;
}

/**
 *  e1000e_cleanup_led_generic - Set LED config to default operation
 *  @hw: pointer to the HW structure
 *
 *  Remove the current LED configuration and set the LED configuration
 *  to the default value, saved from the EEPROM.
 **/
s32 e1000e_cleanup_led_generic(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;

	if (hw->mac.ops.cleanup_led != e1000e_cleanup_led_generic) {
		ret_val = -E1000_ERR_CONFIG;
		goto out;
	}

	ew32(LEDCTL, hw->mac.ledctl_default);

out:
	return ret_val;
}

/**
 *  e1000e_blink_led - Blink LED
 *  @hw: pointer to the HW structure
 *
 *  Blink the LEDs which are set to be on.
 **/
s32 e1000e_blink_led(struct e1000_hw *hw)
{
	u32 ledctl_blink = 0;
	u32 i;

	if (hw->phy.media_type == e1000_media_type_fiber) {
		/* always blink LED0 for PCI-E fiber */
		ledctl_blink = E1000_LEDCTL_LED0_BLINK |
		     (E1000_LEDCTL_MODE_LED_ON << E1000_LEDCTL_LED0_MODE_SHIFT);
	} else {
		/*
		 * set the blink bit for each LED that's "on" (0x0E)
		 * in ledctl_mode2
		 */
		ledctl_blink = hw->mac.ledctl_mode2;
		for (i = 0; i < 4; i++)
			if (((hw->mac.ledctl_mode2 >> (i * 8)) & 0xFF) ==
			    E1000_LEDCTL_MODE_LED_ON)
				ledctl_blink |= (E1000_LEDCTL_LED0_BLINK <<
				                 (i * 8));
	}

	ew32(LEDCTL, ledctl_blink);

	return E1000_SUCCESS;
}

/**
 *  e1000e_led_on_generic - Turn LED on
 *  @hw: pointer to the HW structure
 *
 *  Turn LED on.
 **/
s32 e1000e_led_on_generic(struct e1000_hw *hw)
{
	u32 ctrl;

	switch (hw->phy.media_type) {
	case e1000_media_type_fiber:
		ctrl = er32(CTRL);
		ctrl &= ~E1000_CTRL_SWDPIN0;
		ctrl |= E1000_CTRL_SWDPIO0;
		ew32(CTRL, ctrl);
		break;
	case e1000_media_type_copper:
		ew32(LEDCTL, hw->mac.ledctl_mode2);
		break;
	default:
		break;
	}

	return E1000_SUCCESS;
}

/**
 *  e1000e_led_off_generic - Turn LED off
 *  @hw: pointer to the HW structure
 *
 *  Turn LED off.
 **/
s32 e1000e_led_off_generic(struct e1000_hw *hw)
{
	u32 ctrl;

	switch (hw->phy.media_type) {
	case e1000_media_type_fiber:
		ctrl = er32(CTRL);
		ctrl |= E1000_CTRL_SWDPIN0;
		ctrl |= E1000_CTRL_SWDPIO0;
		ew32(CTRL, ctrl);
		break;
	case e1000_media_type_copper:
		ew32(LEDCTL, hw->mac.ledctl_mode1);
		break;
	default:
		break;
	}

	return E1000_SUCCESS;
}

/**
 *  e1000e_set_pcie_no_snoop - Set PCI-express capabilities
 *  @hw: pointer to the HW structure
 *  @no_snoop: bitmap of snoop events
 *
 *  Set the PCI-express register to snoop for events enabled in 'no_snoop'.
 **/
void e1000e_set_pcie_no_snoop(struct e1000_hw *hw, u32 no_snoop)
{
	u32 gcr;

	if (hw->bus.type != e1000_bus_type_pci_express)
		goto out;

	if (no_snoop) {
		gcr = er32(GCR);
		gcr &= ~(PCIE_NO_SNOOP_ALL);
		gcr |= no_snoop;
		ew32(GCR, gcr);
	}
out:
	return;
}

/**
 *  e1000e_disable_pcie_master - Disables PCI-express master access
 *  @hw: pointer to the HW structure
 *
 *  Returns 0 (E1000_SUCCESS) if successful, else returns -10
 *  (-E1000_ERR_MASTER_REQUESTS_PENDING) if master disable bit has not caused
 *  the master requests to be disabled.
 *
 *  Disables PCI-Express master access and verifies there are no pending
 *  requests.
 **/
s32 e1000e_disable_pcie_master(struct e1000_hw *hw)
{
	u32 ctrl;
	s32 timeout = MASTER_DISABLE_TIMEOUT;
	s32 ret_val = E1000_SUCCESS;

	if (hw->bus.type != e1000_bus_type_pci_express)
		goto out;

	ctrl = er32(CTRL);
	ctrl |= E1000_CTRL_GIO_MASTER_DISABLE;
	ew32(CTRL, ctrl);

	while (timeout) {
		if (!(er32(STATUS) &
		      E1000_STATUS_GIO_MASTER_ENABLE))
			break;
		udelay(100);
		timeout--;
	}

	if (!timeout) {
		e_dbg("Master requests are pending.\n");
		ret_val = -E1000_ERR_MASTER_REQUESTS_PENDING;
		goto out;
	}

out:
	return ret_val;
}

/**
 *  e1000e_reset_adaptive - Reset Adaptive Interframe Spacing
 *  @hw: pointer to the HW structure
 *
 *  Reset the Adaptive Interframe Spacing throttle to default values.
 **/
void e1000e_reset_adaptive(struct e1000_hw *hw)
{
	struct e1000_mac_info *mac = &hw->mac;

	if (!mac->adaptive_ifs) {
		e_dbg("Not in Adaptive IFS mode!\n");
		goto out;
	}

	mac->current_ifs_val = 0;
	mac->ifs_min_val = IFS_MIN;
	mac->ifs_max_val = IFS_MAX;
	mac->ifs_step_size = IFS_STEP;
	mac->ifs_ratio = IFS_RATIO;

	mac->in_ifs_mode = false;
	ew32(AIT, 0);
out:
	return;
}

/**
 *  e1000e_update_adaptive - Update Adaptive Interframe Spacing
 *  @hw: pointer to the HW structure
 *
 *  Update the Adaptive Interframe Spacing Throttle value based on the
 *  time between transmitted packets and time between collisions.
 **/
void e1000e_update_adaptive(struct e1000_hw *hw)
{
	struct e1000_mac_info *mac = &hw->mac;

	if (!mac->adaptive_ifs) {
		e_dbg("Not in Adaptive IFS mode!\n");
		goto out;
	}

	if ((mac->collision_delta * mac->ifs_ratio) > mac->tx_packet_delta) {
		if (mac->tx_packet_delta > MIN_NUM_XMITS) {
			mac->in_ifs_mode = true;
			if (mac->current_ifs_val < mac->ifs_max_val) {
				if (!mac->current_ifs_val)
					mac->current_ifs_val = mac->ifs_min_val;
				else
					mac->current_ifs_val +=
						mac->ifs_step_size;
				ew32(AIT, mac->current_ifs_val);
			}
		}
	} else {
		if (mac->in_ifs_mode &&
		    (mac->tx_packet_delta <= MIN_NUM_XMITS)) {
			mac->current_ifs_val = 0;
			mac->in_ifs_mode = false;
			ew32(AIT, 0);
		}
	}
out:
	return;
}

/**
 *  e1000_validate_mdi_setting_generic - Verify MDI/MDIx settings
 *  @hw: pointer to the HW structure
 *
 *  Verify that when not using auto-negotiation that MDI/MDIx is correctly
 *  set, which is forced to MDI mode only.
 **/
s32 e1000_validate_mdi_setting_generic(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;

	if (!hw->mac.autoneg && (hw->phy.mdix == 0 || hw->phy.mdix == 3)) {
		e_dbg("Invalid MDI setting detected\n");
		hw->phy.mdix = 1;
		ret_val = -E1000_ERR_CONFIG;
		goto out;
	}

out:
	return ret_val;
}