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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 Intel Corporation */
#include <linux/delay.h>
#include "igc_hw.h"
#include "igc_i225.h"
/**
* igc_rx_fifo_flush_base - Clean rx fifo after Rx enable
* @hw: pointer to the HW structure
*
* After Rx enable, if manageability is enabled then there is likely some
* bad data at the start of the fifo and possibly in the DMA fifo. This
* function clears the fifos and flushes any packets that came in as rx was
* being enabled.
*/
void igc_rx_fifo_flush_base(struct igc_hw *hw)
{
u32 rctl, rlpml, rxdctl[4], rfctl, temp_rctl, rx_enabled;
int i, ms_wait;
/* disable IPv6 options as per hardware errata */
rfctl = rd32(IGC_RFCTL);
rfctl |= IGC_RFCTL_IPV6_EX_DIS;
wr32(IGC_RFCTL, rfctl);
if (!(rd32(IGC_MANC) & IGC_MANC_RCV_TCO_EN))
return;
/* Disable all Rx queues */
for (i = 0; i < 4; i++) {
rxdctl[i] = rd32(IGC_RXDCTL(i));
wr32(IGC_RXDCTL(i),
rxdctl[i] & ~IGC_RXDCTL_QUEUE_ENABLE);
}
/* Poll all queues to verify they have shut down */
for (ms_wait = 0; ms_wait < 10; ms_wait++) {
usleep_range(1000, 2000);
rx_enabled = 0;
for (i = 0; i < 4; i++)
rx_enabled |= rd32(IGC_RXDCTL(i));
if (!(rx_enabled & IGC_RXDCTL_QUEUE_ENABLE))
break;
}
if (ms_wait == 10)
pr_debug("Queue disable timed out after 10ms\n");
/* Clear RLPML, RCTL.SBP, RFCTL.LEF, and set RCTL.LPE so that all
* incoming packets are rejected. Set enable and wait 2ms so that
* any packet that was coming in as RCTL.EN was set is flushed
*/
wr32(IGC_RFCTL, rfctl & ~IGC_RFCTL_LEF);
rlpml = rd32(IGC_RLPML);
wr32(IGC_RLPML, 0);
rctl = rd32(IGC_RCTL);
temp_rctl = rctl & ~(IGC_RCTL_EN | IGC_RCTL_SBP);
temp_rctl |= IGC_RCTL_LPE;
wr32(IGC_RCTL, temp_rctl);
wr32(IGC_RCTL, temp_rctl | IGC_RCTL_EN);
wrfl();
usleep_range(2000, 3000);
/* Enable Rx queues that were previously enabled and restore our
* previous state
*/
for (i = 0; i < 4; i++)
wr32(IGC_RXDCTL(i), rxdctl[i]);
wr32(IGC_RCTL, rctl);
wrfl();
wr32(IGC_RLPML, rlpml);
wr32(IGC_RFCTL, rfctl);
/* Flush receive errors generated by workaround */
rd32(IGC_ROC);
rd32(IGC_RNBC);
rd32(IGC_MPC);
}
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