--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * https://spdx.org/licenses
+ */
+
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <log.h>
+#include <malloc.h>
+#include <pci.h>
+
+#include <asm/io.h>
+
+#include <linux/ioport.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * This driver supports multiple types of operations / host bridges / busses:
+ *
+ * OTX_ECAM: Octeon TX & TX2 ECAM (Enhanced Configuration Access Mechanism)
+ * Used to access the internal on-chip devices which are connected
+ * to internal buses
+ * OTX_PEM: Octeon TX PEM (PCI Express MAC)
+ * Used to access the external (off-chip) PCI devices
+ * OTX2_PEM: Octeon TX2 PEM (PCI Express MAC)
+ * Used to access the external (off-chip) PCI devices
+ */
+enum {
+ OTX_ECAM,
+ OTX_PEM,
+ OTX2_PEM,
+};
+
+/**
+ * struct octeontx_pci - Driver private data
+ * @type: Device type matched via compatible (e.g. OTX_ECAM etc)
+ * @cfg: Config resource
+ * @bus: Bus resource
+ */
+struct octeontx_pci {
+ unsigned int type;
+
+ struct resource cfg;
+ struct resource bus;
+};
+
+static uintptr_t octeontx_cfg_addr(struct octeontx_pci *pcie,
+ int bus_offs, int shift_offs,
+ pci_dev_t bdf, uint offset)
+{
+ u32 bus, dev, func;
+ uintptr_t address;
+
+ bus = PCI_BUS(bdf) + bus_offs;
+ dev = PCI_DEV(bdf);
+ func = PCI_FUNC(bdf);
+
+ address = (bus << (20 + shift_offs)) |
+ (dev << (15 + shift_offs)) |
+ (func << (12 + shift_offs)) | offset;
+ address += pcie->cfg.start;
+
+ return address;
+}
+
+static ulong readl_size(uintptr_t addr, enum pci_size_t size)
+{
+ ulong val;
+
+ switch (size) {
+ case PCI_SIZE_8:
+ val = readb(addr);
+ break;
+ case PCI_SIZE_16:
+ val = readw(addr);
+ break;
+ case PCI_SIZE_32:
+ val = readl(addr);
+ break;
+ default:
+ printf("Invalid size\n");
+ return -EINVAL;
+ };
+
+ return val;
+}
+
+static void writel_size(uintptr_t addr, enum pci_size_t size, ulong valuep)
+{
+ switch (size) {
+ case PCI_SIZE_8:
+ writeb(valuep, addr);
+ break;
+ case PCI_SIZE_16:
+ writew(valuep, addr);
+ break;
+ case PCI_SIZE_32:
+ writel(valuep, addr);
+ break;
+ default:
+ printf("Invalid size\n");
+ };
+}
+
+static bool octeontx_bdf_invalid(pci_dev_t bdf)
+{
+ if (PCI_BUS(bdf) == 1 && PCI_DEV(bdf) > 0)
+ return true;
+
+ return false;
+}
+
+static int octeontx_ecam_read_config(const struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong *valuep,
+ enum pci_size_t size)
+{
+ struct octeontx_pci *pcie = (struct octeontx_pci *)dev_get_priv(bus);
+ struct pci_controller *hose = dev_get_uclass_priv(bus);
+ uintptr_t address;
+
+ address = octeontx_cfg_addr(pcie, pcie->bus.start - hose->first_busno,
+ 0, bdf, offset);
+ *valuep = readl_size(address, size);
+
+ debug("%02x.%02x.%02x: u%d %x -> %lx\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), size, offset, *valuep);
+
+ return 0;
+}
+
+static int octeontx_ecam_write_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ struct octeontx_pci *pcie = (struct octeontx_pci *)dev_get_priv(bus);
+ struct pci_controller *hose = dev_get_uclass_priv(bus);
+ uintptr_t address;
+
+ address = octeontx_cfg_addr(pcie, pcie->bus.start - hose->first_busno,
+ 0, bdf, offset);
+ writel_size(address, size, value);
+
+ debug("%02x.%02x.%02x: u%d %x <- %lx\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), size, offset, value);
+
+ return 0;
+}
+
+static int octeontx_pem_read_config(const struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong *valuep,
+ enum pci_size_t size)
+{
+ struct octeontx_pci *pcie = (struct octeontx_pci *)dev_get_priv(bus);
+ struct pci_controller *hose = dev_get_uclass_priv(bus);
+ uintptr_t address;
+ u8 hdrtype;
+ u8 pri_bus = pcie->bus.start + 1 - hose->first_busno;
+ u32 bus_offs = (pri_bus << 16) | (pri_bus << 8) | (pri_bus << 0);
+
+ address = octeontx_cfg_addr(pcie, 1 - hose->first_busno, 4,
+ bdf, 0);
+
+ *valuep = pci_conv_32_to_size(~0UL, offset, size);
+
+ if (octeontx_bdf_invalid(bdf))
+ return -EPERM;
+
+ *valuep = readl_size(address + offset, size);
+
+ hdrtype = readb(address + PCI_HEADER_TYPE);
+ if (hdrtype == PCI_HEADER_TYPE_BRIDGE &&
+ offset >= PCI_PRIMARY_BUS &&
+ offset <= PCI_SUBORDINATE_BUS &&
+ *valuep != pci_conv_32_to_size(~0UL, offset, size))
+ *valuep -= pci_conv_32_to_size(bus_offs, offset, size);
+
+ return 0;
+}
+
+static int octeontx_pem_write_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ struct octeontx_pci *pcie = (struct octeontx_pci *)dev_get_priv(bus);
+ struct pci_controller *hose = dev_get_uclass_priv(bus);
+ uintptr_t address;
+ u8 hdrtype;
+ u8 pri_bus = pcie->bus.start + 1 - hose->first_busno;
+ u32 bus_offs = (pri_bus << 16) | (pri_bus << 8) | (pri_bus << 0);
+
+ address = octeontx_cfg_addr(pcie, 1 - hose->first_busno, 4, bdf, 0);
+
+ hdrtype = readb(address + PCI_HEADER_TYPE);
+ if (hdrtype == PCI_HEADER_TYPE_BRIDGE &&
+ offset >= PCI_PRIMARY_BUS &&
+ offset <= PCI_SUBORDINATE_BUS &&
+ value != pci_conv_32_to_size(~0UL, offset, size))
+ value += pci_conv_32_to_size(bus_offs, offset, size);
+
+ if (octeontx_bdf_invalid(bdf))
+ return -EPERM;
+
+ writel_size(address + offset, size, value);
+
+ debug("%02x.%02x.%02x: u%d %x (%lx) <- %lx\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), size, offset,
+ address, value);
+
+ return 0;
+}
+
+static int octeontx2_pem_read_config(const struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong *valuep,
+ enum pci_size_t size)
+{
+ struct octeontx_pci *pcie = (struct octeontx_pci *)dev_get_priv(bus);
+ struct pci_controller *hose = dev_get_uclass_priv(bus);
+ uintptr_t address;
+
+ address = octeontx_cfg_addr(pcie, 1 - hose->first_busno, 0,
+ bdf, 0);
+
+ *valuep = pci_conv_32_to_size(~0UL, offset, size);
+
+ if (octeontx_bdf_invalid(bdf))
+ return -EPERM;
+
+ *valuep = readl_size(address + offset, size);
+
+ debug("%02x.%02x.%02x: u%d %x (%lx) -> %lx\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), size, offset,
+ address, *valuep);
+
+ return 0;
+}
+
+static int octeontx2_pem_write_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ struct octeontx_pci *pcie = (struct octeontx_pci *)dev_get_priv(bus);
+ struct pci_controller *hose = dev_get_uclass_priv(bus);
+ uintptr_t address;
+
+ address = octeontx_cfg_addr(pcie, 1 - hose->first_busno, 0,
+ bdf, 0);
+
+ if (octeontx_bdf_invalid(bdf))
+ return -EPERM;
+
+ writel_size(address + offset, size, value);
+
+ debug("%02x.%02x.%02x: u%d %x (%lx) <- %lx\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), size, offset,
+ address, value);
+
+ return 0;
+}
+
+int pci_octeontx_read_config(const struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong *valuep,
+ enum pci_size_t size)
+{
+ struct octeontx_pci *pcie = (struct octeontx_pci *)dev_get_priv(bus);
+ int ret = -EIO;
+
+ switch (pcie->type) {
+ case OTX_ECAM:
+ ret = octeontx_ecam_read_config(bus, bdf, offset, valuep,
+ size);
+ break;
+ case OTX_PEM:
+ ret = octeontx_pem_read_config(bus, bdf, offset, valuep,
+ size);
+ break;
+ case OTX2_PEM:
+ ret = octeontx2_pem_read_config(bus, bdf, offset, valuep,
+ size);
+ break;
+ }
+
+ return ret;
+}
+
+int pci_octeontx_write_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ struct octeontx_pci *pcie = (struct octeontx_pci *)dev_get_priv(bus);
+ int ret = -EIO;
+
+ switch (pcie->type) {
+ case OTX_ECAM:
+ ret = octeontx_ecam_write_config(bus, bdf, offset, value,
+ size);
+ break;
+ case OTX_PEM:
+ ret = octeontx_pem_write_config(bus, bdf, offset, value,
+ size);
+ break;
+ case OTX2_PEM:
+ ret = octeontx2_pem_write_config(bus, bdf, offset, value,
+ size);
+ break;
+ }
+
+ return ret;
+}
+
+static int pci_octeontx_ofdata_to_platdata(struct udevice *dev)
+{
+ return 0;
+}
+
+static int pci_octeontx_probe(struct udevice *dev)
+{
+ struct octeontx_pci *pcie = (struct octeontx_pci *)dev_get_priv(dev);
+ int err;
+
+ pcie->type = dev_get_driver_data(dev);
+
+ err = dev_read_resource(dev, 0, &pcie->cfg);
+ if (err) {
+ debug("Error reading resource: %s\n", fdt_strerror(err));
+ return err;
+ }
+
+ err = dev_read_pci_bus_range(dev, &pcie->bus);
+ if (err) {
+ debug("Error reading resource: %s\n", fdt_strerror(err));
+ return err;
+ }
+
+ return 0;
+}
+
+static const struct dm_pci_ops pci_octeontx_ops = {
+ .read_config = pci_octeontx_read_config,
+ .write_config = pci_octeontx_write_config,
+};
+
+static const struct udevice_id pci_octeontx_ids[] = {
+ { .compatible = "cavium,pci-host-thunder-ecam", .data = OTX_ECAM },
+ { .compatible = "cavium,pci-host-octeontx-ecam", .data = OTX_ECAM },
+ { .compatible = "pci-host-ecam-generic", .data = OTX_ECAM },
+ { .compatible = "cavium,pci-host-thunder-pem", .data = OTX_PEM },
+ { .compatible = "marvell,pci-host-octeontx2-pem", .data = OTX2_PEM },
+ { }
+};
+
+U_BOOT_DRIVER(pci_octeontx) = {
+ .name = "pci_octeontx",
+ .id = UCLASS_PCI,
+ .of_match = pci_octeontx_ids,
+ .ops = &pci_octeontx_ops,
+ .ofdata_to_platdata = pci_octeontx_ofdata_to_platdata,
+ .probe = pci_octeontx_probe,
+ .priv_auto_alloc_size = sizeof(struct octeontx_pci),
+ .flags = DM_FLAG_PRE_RELOC,
+};
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