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// 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/global_data.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_of_to_plat(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,
.of_to_plat = pci_octeontx_of_to_plat,
.probe = pci_octeontx_probe,
.priv_auto = sizeof(struct octeontx_pci),
.flags = DM_FLAG_PRE_RELOC,
};
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