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// SPDX-License-Identifier: GPL-2.0
/*
* 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 <dm.h>
#include <pci.h>
#include <asm/io.h>
/**
* struct generic_ecam_pcie - generic_ecam PCIe controller state
* @cfg_base: The base address of memory mapped configuration space
*/
struct generic_ecam_pcie {
void *cfg_base;
pci_size_t size;
int first_busno;
};
/**
* pci_generic_ecam_conf_address() - Calculate the address of a config access
* @bus: Pointer to the PCI bus
* @bdf: Identifies the PCIe device to access
* @offset: The offset into the device's configuration space
* @paddress: Pointer to the pointer to write the calculates address to
*
* Calculates the address that should be accessed to perform a PCIe
* configuration space access for a given device identified by the PCIe
* controller device @pcie and the bus, device & function numbers in @bdf. If
* access to the device is not valid then the function will return an error
* code. Otherwise the address to access will be written to the pointer pointed
* to by @paddress.
*/
static int pci_generic_ecam_conf_address(const struct udevice *bus,
pci_dev_t bdf, uint offset,
void **paddress)
{
struct generic_ecam_pcie *pcie = dev_get_priv(bus);
void *addr;
addr = pcie->cfg_base;
addr += (PCI_BUS(bdf) - pcie->first_busno) << 20;
addr += PCI_DEV(bdf) << 15;
addr += PCI_FUNC(bdf) << 12;
addr += offset;
*paddress = addr;
return 0;
}
static bool pci_generic_ecam_addr_valid(const struct udevice *bus,
pci_dev_t bdf)
{
struct generic_ecam_pcie *pcie = dev_get_priv(bus);
int num_buses = DIV_ROUND_UP(pcie->size, 1 << 16);
return (PCI_BUS(bdf) >= pcie->first_busno &&
PCI_BUS(bdf) < pcie->first_busno + num_buses);
}
/**
* pci_generic_ecam_read_config() - Read from configuration space
* @bus: Pointer to the PCI bus
* @bdf: Identifies the PCIe device to access
* @offset: The offset into the device's configuration space
* @valuep: A pointer at which to store the read value
* @size: Indicates the size of access to perform
*
* Read a value of size @size from offset @offset within the configuration
* space of the device identified by the bus, device & function numbers in @bdf
* on the PCI bus @bus.
*/
static int pci_generic_ecam_read_config(const struct udevice *bus,
pci_dev_t bdf, uint offset,
ulong *valuep, enum pci_size_t size)
{
if (!pci_generic_ecam_addr_valid(bus, bdf)) {
*valuep = pci_get_ff(size);
return 0;
}
return pci_generic_mmap_read_config(bus, pci_generic_ecam_conf_address,
bdf, offset, valuep, size);
}
/**
* pci_generic_ecam_write_config() - Write to configuration space
* @bus: Pointer to the PCI bus
* @bdf: Identifies the PCIe device to access
* @offset: The offset into the device's configuration space
* @value: The value to write
* @size: Indicates the size of access to perform
*
* Write the value @value of size @size from offset @offset within the
* configuration space of the device identified by the bus, device & function
* numbers in @bdf on the PCI bus @bus.
*/
static int pci_generic_ecam_write_config(struct udevice *bus, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
if (!pci_generic_ecam_addr_valid(bus, bdf))
return 0;
return pci_generic_mmap_write_config(bus, pci_generic_ecam_conf_address,
bdf, offset, value, size);
}
/**
* pci_generic_ecam_of_to_plat() - Translate from DT to device state
* @dev: A pointer to the device being operated on
*
* Translate relevant data from the device tree pertaining to device @dev into
* state that the driver will later make use of. This state is stored in the
* device's private data structure.
*
* Return: 0 on success, else -EINVAL
*/
static int pci_generic_ecam_of_to_plat(struct udevice *dev)
{
struct generic_ecam_pcie *pcie = dev_get_priv(dev);
struct fdt_resource reg_res;
DECLARE_GLOBAL_DATA_PTR;
int err;
err = fdt_get_resource(gd->fdt_blob, dev_of_offset(dev), "reg",
0, ®_res);
if (err < 0) {
pr_err("\"reg\" resource not found\n");
return err;
}
pcie->size = fdt_resource_size(®_res);
pcie->cfg_base = map_physmem(reg_res.start, pcie->size, MAP_NOCACHE);
return 0;
}
static int pci_generic_ecam_probe(struct udevice *dev)
{
struct generic_ecam_pcie *pcie = dev_get_priv(dev);
pcie->first_busno = dev_seq(dev);
return 0;
}
static const struct dm_pci_ops pci_generic_ecam_ops = {
.read_config = pci_generic_ecam_read_config,
.write_config = pci_generic_ecam_write_config,
};
static const struct udevice_id pci_generic_ecam_ids[] = {
{ .compatible = "pci-host-ecam-generic" },
{ }
};
U_BOOT_DRIVER(pci_generic_ecam) = {
.name = "pci_generic_ecam",
.id = UCLASS_PCI,
.of_match = pci_generic_ecam_ids,
.ops = &pci_generic_ecam_ops,
.probe = pci_generic_ecam_probe,
.of_to_plat = pci_generic_ecam_of_to_plat,
.priv_auto = sizeof(struct generic_ecam_pcie),
};
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