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// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic PCIE host provided by e.g. QEMU
*
* Heavily based on drivers/pci/pcie_xilinx.c
*
* Copyright (C) 2016 Imagination Technologies
*/
#include <common.h>
#include <malloc.h>
#include <io.h>
#include <of.h>
#include <of_address.h>
#include <init.h>
#include <linux/pci.h>
#include <linux/sizes.h>
struct generic_ecam_pcie {
struct pci_controller pci;
struct resource *cfg;
int first_busno;
struct resource io;
struct resource mem;
struct resource prefetch;
};
static inline struct generic_ecam_pcie *host_to_ecam(struct pci_controller *host)
{
return container_of(host, struct generic_ecam_pcie, pci);
}
static void __iomem *pci_generic_ecam_conf_address(const struct pci_bus *bus,
u32 devfn, int where)
{
struct generic_ecam_pcie *ecam = host_to_ecam(bus->host);
void __iomem *addr;
addr = IOMEM(ecam->cfg->start);
addr += (bus->number - ecam->first_busno) << 20;
addr += PCI_SLOT(devfn) << 15;
addr += PCI_FUNC(devfn) << 12;
addr += where;
return addr;
}
static bool pci_generic_ecam_addr_valid(const struct pci_bus *bus, u32 devfn)
{
struct generic_ecam_pcie *ecam = host_to_ecam(bus->host);
int num_buses = DIV_ROUND_UP(resource_size(ecam->cfg), 1 << 16);
return (bus->number >= ecam->first_busno &&
bus->number < ecam->first_busno + num_buses);
}
static int pci_generic_ecam_read_config(struct pci_bus *bus,
u32 devfn, int where,
int size, u32 *val)
{
void __iomem *addr;
if (!pci_generic_ecam_addr_valid(bus, devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
addr = pci_generic_ecam_conf_address(bus, devfn, where);
if (!IS_ALIGNED((uintptr_t)addr, size)) {
*val = 0;
return PCIBIOS_BAD_REGISTER_NUMBER;
}
if (size == 4) {
*val = readl(addr);
} else if (size == 2) {
*val = readw(addr);
} else if (size == 1) {
*val = readb(addr);
} else {
*val = 0;
return PCIBIOS_BAD_REGISTER_NUMBER;
}
return PCIBIOS_SUCCESSFUL;
}
static int pci_generic_ecam_write_config(struct pci_bus *bus, u32 devfn,
int where, int size, u32 val)
{
void __iomem *addr;
if (!pci_generic_ecam_addr_valid(bus, devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
addr = pci_generic_ecam_conf_address(bus, devfn, where);
if (!IS_ALIGNED((uintptr_t)addr, size))
return PCIBIOS_BAD_REGISTER_NUMBER;
if (size == 4)
writel(val, addr);
else if (size == 2)
writew(val, addr);
else if (size == 1)
writeb(val, addr);
else
return PCIBIOS_BAD_REGISTER_NUMBER;
return PCIBIOS_SUCCESSFUL;
}
static void pcie_ecam_set_local_bus_nr(struct pci_controller *host, int busno)
{
struct generic_ecam_pcie *ecam = host_to_ecam(host);
ecam->first_busno = busno;
}
static const struct pci_ops pci_generic_ecam_ops = {
.read = pci_generic_ecam_read_config,
.write = pci_generic_ecam_write_config,
};
static inline bool is_64bit(const struct resource *res)
{
return res->flags & IORESOURCE_MEM_64;
}
static int pcie_ecam_parse_dt(struct generic_ecam_pcie *ecam)
{
struct device *dev = ecam->pci.parent;
struct device_node *np = dev->of_node;
struct of_pci_range_parser parser;
struct of_pci_range range;
struct resource res;
if (of_pci_range_parser_init(&parser, np)) {
dev_err(dev, "missing \"ranges\" property\n");
return -EINVAL;
}
for_each_of_pci_range(&parser, &range) {
of_pci_range_to_resource(&range, np, &res);
switch (res.flags & IORESOURCE_TYPE_BITS) {
case IORESOURCE_IO:
memcpy(&ecam->io, &res, sizeof(res));
ecam->io.name = "I/O";
break;
case IORESOURCE_MEM:
if (res.flags & IORESOURCE_PREFETCH) {
memcpy(&ecam->prefetch, &res, sizeof(res));
ecam->prefetch.name = "PREFETCH";
} else {
/* Choose 32-bit mappings over 64-bit ones if possible */
if (ecam->mem.name && !is_64bit(&ecam->mem) && is_64bit(&res))
break;
memcpy(&ecam->mem, &res, sizeof(res));
ecam->mem.name = "MEM";
}
break;
}
}
return 0;
}
static int pcie_ecam_probe(struct device *dev)
{
struct generic_ecam_pcie *ecam;
struct resource *iores;
int ret;
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores))
return PTR_ERR(iores);
ecam = xzalloc(sizeof(*ecam));
ecam->cfg = iores;
ecam->pci.parent = dev;
ecam->pci.pci_ops = &pci_generic_ecam_ops;
ecam->pci.set_busno = pcie_ecam_set_local_bus_nr;
ecam->pci.mem_resource = &ecam->mem;
ecam->pci.io_resource = &ecam->io;
ecam->pci.mem_pref_resource = &ecam->prefetch;
ret = pcie_ecam_parse_dt(ecam);
if (ret)
return ret;
register_pci_controller(&ecam->pci);
return 0;
}
static struct of_device_id pcie_ecam_dt_ids[] = {
{ .compatible = "pci-host-ecam-generic" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, pcie_ecam_dt_ids);
static struct driver pcie_ecam_driver = {
.name = "pcie-generic-ecam",
.probe = pcie_ecam_probe,
.of_compatible = pcie_ecam_dt_ids,
};
device_platform_driver(pcie_ecam_driver);
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