// SPDX-License-Identifier: GPL-2.0
/*
 * PLDA PCIe XpressRich host controller driver
 *
 * Copyright (C) 2023 Microchip Co. Ltd
 *
 * Author: Daire McNamara <daire.mcnamara@microchip.com>
 */

#include <linux/pci-ecam.h>

#include "pcie-plda.h"

void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
			    phys_addr_t axi_addr, phys_addr_t pci_addr,
			    size_t size)
{
	u32 atr_sz = ilog2(size) - 1;
	u32 val;

	if (index == 0)
		val = PCIE_CONFIG_INTERFACE;
	else
		val = PCIE_TX_RX_INTERFACE;

	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) +
	       ATR0_AXI4_SLV0_TRSL_PARAM);

	val = lower_32_bits(axi_addr) | (atr_sz << ATR_SIZE_SHIFT) |
			    ATR_IMPL_ENABLE;
	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) +
	       ATR0_AXI4_SLV0_SRCADDR_PARAM);

	val = upper_32_bits(axi_addr);
	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) +
	       ATR0_AXI4_SLV0_SRC_ADDR);

	val = lower_32_bits(pci_addr);
	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) +
	       ATR0_AXI4_SLV0_TRSL_ADDR_LSB);

	val = upper_32_bits(pci_addr);
	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) +
	       ATR0_AXI4_SLV0_TRSL_ADDR_UDW);

	val = readl(bridge_base_addr + ATR0_PCIE_WIN0_SRCADDR_PARAM);
	val |= (ATR0_PCIE_ATR_SIZE << ATR0_PCIE_ATR_SIZE_SHIFT);
	writel(val, bridge_base_addr + ATR0_PCIE_WIN0_SRCADDR_PARAM);
	writel(0, bridge_base_addr + ATR0_PCIE_WIN0_SRC_ADDR);
}
EXPORT_SYMBOL_GPL(plda_pcie_setup_window);

int plda_pcie_setup_iomems(struct platform_device *pdev,
			   struct plda_pcie_rp *port)
{
	void __iomem *bridge_base_addr = port->bridge_addr;
	struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
	struct resource_entry *entry;
	u64 pci_addr;
	u32 index = 1;

	resource_list_for_each_entry(entry, &bridge->windows) {
		if (resource_type(entry->res) == IORESOURCE_MEM) {
			pci_addr = entry->res->start - entry->offset;
			plda_pcie_setup_window(bridge_base_addr, index,
					       entry->res->start, pci_addr,
					       resource_size(entry->res));
			index++;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(plda_pcie_setup_iomems);