Function em_hw_control_release

dpdk/drivers/net/e1000/em_ethdev.c:1249–1263

* em_hw_control_release resets {CTRL_EXTT|FWSM}:DRV_LOAD bit. * For ASF and Pass Through versions of f/w this means that the * driver is no longer loaded. For AMT versions of the * f/w this means that the network i/f is closed. */

 * f/w this means that the network i/f is closed.
 */
static void
em_hw_control_release(struct e1000_hw *hw)
{
	uint32_t ctrl_ext, swsm;

	/* Let firmware taken over control of h/w */
	if (hw->mac.type == e1000_82573) {
		swsm = E1000_READ_REG(hw, E1000_SWSM);
		E1000_WRITE_REG(hw, E1000_SWSM, swsm & ~E1000_SWSM_DRV_LOAD);
	} else {
		ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);
		E1000_WRITE_REG(hw, E1000_CTRL_EXT,
			ctrl_ext & ~E1000_CTRL_EXT_DRV_LOAD);
	}
}

/*
 * Bit of a misnomer, what this really means is