drivers/net/ethernet/intel/ixd/ixd_dev.c

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2025 Intel Corporation */

#include "ixd.h"
#include "ixd_lan_regs.h"

/**
 * ixd_ctlq_reg_init - Initialize default mailbox registers
 * @adapter: PCI device driver-specific private data
 * @ctlq_reg_tx: Transmit queue registers info to be filled
 * @ctlq_reg_rx: Receive queue registers info to be filled
 */
void ixd_ctlq_reg_init(struct ixd_adapter *adapter,
		       struct libie_ctlq_reg *ctlq_reg_tx,
		       struct libie_ctlq_reg *ctlq_reg_rx)
{
	struct libie_mmio_info *mmio_info = &adapter->cp_ctx.mmio_info;
	*ctlq_reg_tx = (struct libie_ctlq_reg) {
		.head = libie_pci_get_mmio_addr(mmio_info, PF_FW_ATQH),
		.tail = libie_pci_get_mmio_addr(mmio_info, PF_FW_ATQT),
		.len = libie_pci_get_mmio_addr(mmio_info, PF_FW_ATQLEN),
		.addr_high = libie_pci_get_mmio_addr(mmio_info, PF_FW_ATQBAH),
		.addr_low = libie_pci_get_mmio_addr(mmio_info, PF_FW_ATQBAL),
		.len_mask = PF_FW_ATQLEN_ATQLEN_M,
		.len_ena_mask = PF_FW_ATQLEN_ATQENABLE_M,
		.head_mask = PF_FW_ATQH_ATQH_M,
	};

	*ctlq_reg_rx = (struct libie_ctlq_reg) {
		.head = libie_pci_get_mmio_addr(mmio_info, PF_FW_ARQH),
		.tail = libie_pci_get_mmio_addr(mmio_info, PF_FW_ARQT),
		.len = libie_pci_get_mmio_addr(mmio_info, PF_FW_ARQLEN),
		.addr_high = libie_pci_get_mmio_addr(mmio_info, PF_FW_ARQBAH),
		.addr_low = libie_pci_get_mmio_addr(mmio_info, PF_FW_ARQBAL),
		.len_mask = PF_FW_ARQLEN_ARQLEN_M,
		.len_ena_mask = PF_FW_ARQLEN_ARQENABLE_M,
		.head_mask = PF_FW_ARQH_ARQH_M,
	};
}

static const struct ixd_reset_reg ixd_reset_reg = {
	.rstat  = PFGEN_RSTAT,
	.rstat_m = PFGEN_RSTAT_PFR_STATE_M,
	.rstat_ok_v = 0b01,
	.rtrigger = PFGEN_CTRL,
	.rtrigger_m = PFGEN_CTRL_PFSWR,
};

/**
 * ixd_trigger_reset - Trigger PFR reset
 * @adapter: the device with mapped reset register
 */
void ixd_trigger_reset(struct ixd_adapter *adapter)
{
	void __iomem *addr;
	u32 reg_val;

	addr = libie_pci_get_mmio_addr(&adapter->cp_ctx.mmio_info,
				       ixd_reset_reg.rtrigger);
	reg_val = readl(addr);
	writel(reg_val | ixd_reset_reg.rtrigger_m, addr);
}

/**
 * ixd_check_reset_complete - Check if the PFR reset is completed
 * @adapter: CPF being reset
 *
 * Return: %true if the register read indicates reset has been finished,
 *	   %false otherwise
 */
bool ixd_check_reset_complete(struct ixd_adapter *adapter)
{
	u32 reg_val, reset_status;
	void __iomem *addr;

	addr = libie_pci_get_mmio_addr(&adapter->cp_ctx.mmio_info,
				       ixd_reset_reg.rstat);
	reg_val = readl(addr);
	reset_status = reg_val & ixd_reset_reg.rstat_m;

	/* 0xFFFFFFFF might be read if the other side hasn't cleared
	 * the register for us yet.
	 */
	if (reg_val != GENMASK(31, 0) &&
	    reset_status == ixd_reset_reg.rstat_ok_v)
		return true;

	return false;
}