1 // SPDX-License-Identifier: GPL-2.0+
3 * ACPI quirks for Tegra194 PCIe host controller
5 * Copyright (C) 2021 NVIDIA Corporation.
7 * Author: Vidya Sagar <vidyas@nvidia.com>
10 #include <linux/pci.h>
11 #include <linux/pci-acpi.h>
12 #include <linux/pci-ecam.h>
14 #include "pcie-designware.h"
16 struct tegra194_pcie_ecam {
17 void __iomem *config_base;
18 void __iomem *iatu_base;
19 void __iomem *dbi_base;
22 static int tegra194_acpi_init(struct pci_config_window *cfg)
24 struct device *dev = cfg->parent;
25 struct tegra194_pcie_ecam *pcie_ecam;
27 pcie_ecam = devm_kzalloc(dev, sizeof(*pcie_ecam), GFP_KERNEL);
31 pcie_ecam->config_base = cfg->win;
32 pcie_ecam->iatu_base = cfg->win + SZ_256K;
33 pcie_ecam->dbi_base = cfg->win + SZ_512K;
34 cfg->priv = pcie_ecam;
39 static void atu_reg_write(struct tegra194_pcie_ecam *pcie_ecam, int index,
42 u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
44 writel(val, pcie_ecam->iatu_base + offset + reg);
47 static void program_outbound_atu(struct tegra194_pcie_ecam *pcie_ecam,
48 int index, int type, u64 cpu_addr,
49 u64 pci_addr, u64 size)
51 atu_reg_write(pcie_ecam, index, lower_32_bits(cpu_addr),
53 atu_reg_write(pcie_ecam, index, upper_32_bits(cpu_addr),
55 atu_reg_write(pcie_ecam, index, lower_32_bits(pci_addr),
56 PCIE_ATU_LOWER_TARGET);
57 atu_reg_write(pcie_ecam, index, lower_32_bits(cpu_addr + size - 1),
59 atu_reg_write(pcie_ecam, index, upper_32_bits(pci_addr),
60 PCIE_ATU_UPPER_TARGET);
61 atu_reg_write(pcie_ecam, index, type, PCIE_ATU_CR1);
62 atu_reg_write(pcie_ecam, index, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
65 static void __iomem *tegra194_map_bus(struct pci_bus *bus,
66 unsigned int devfn, int where)
68 struct pci_config_window *cfg = bus->sysdata;
69 struct tegra194_pcie_ecam *pcie_ecam = cfg->priv;
73 if (bus->number < cfg->busr.start || bus->number > cfg->busr.end)
76 if (bus->number == cfg->busr.start) {
77 if (PCI_SLOT(devfn) == 0)
78 return pcie_ecam->dbi_base + where;
83 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
84 PCIE_ATU_FUNC(PCI_FUNC(devfn));
86 if (bus->parent->number == cfg->busr.start) {
87 if (PCI_SLOT(devfn) == 0)
88 type = PCIE_ATU_TYPE_CFG0;
92 type = PCIE_ATU_TYPE_CFG1;
95 program_outbound_atu(pcie_ecam, 0, type, cfg->res.start, busdev,
98 return pcie_ecam->config_base + where;
101 const struct pci_ecam_ops tegra194_pcie_ops = {
102 .init = tegra194_acpi_init,
104 .map_bus = tegra194_map_bus,
105 .read = pci_generic_config_read,
106 .write = pci_generic_config_write,