pci_sandbox.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2014 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <pci.h>
#define FDT_DEV_INFO_CELLS 4
#define FDT_DEV_INFO_SIZE (FDT_DEV_INFO_CELLS * sizeof(u32))
#define SANDBOX_PCI_DEVFN(d, f) ((d << 3) | f)
struct sandbox_pci_priv {
struct {
u16 vendor;
u16 device;
} vendev[256];
};
static int sandbox_pci_write_config(struct udevice *bus, pci_dev_t devfn,
uint offset, ulong value,
enum pci_size_t size)
{
struct dm_pci_emul_ops *ops;
struct udevice *container, *emul;
int ret;
ret = sandbox_pci_get_emul(bus, devfn, &container, &emul);
if (ret)
return ret == -ENODEV ? 0 : ret;
ops = pci_get_emul_ops(emul);
if (!ops || !ops->write_config)
return -ENOSYS;
return ops->write_config(emul, offset, value, size);
}
static int sandbox_pci_read_config(const struct udevice *bus, pci_dev_t devfn,
uint offset, ulong *valuep,
enum pci_size_t size)
{
struct dm_pci_emul_ops *ops;
struct udevice *container, *emul;
struct sandbox_pci_priv *priv = dev_get_priv(bus);
int ret;
/* Prepare the default response */
*valuep = pci_get_ff(size);
ret = sandbox_pci_get_emul(bus, devfn, &container, &emul);
if (ret) {
if (!container) {
u16 vendor, device;
devfn = SANDBOX_PCI_DEVFN(PCI_DEV(devfn),
PCI_FUNC(devfn));
vendor = priv->vendev[devfn].vendor;
device = priv->vendev[devfn].device;
if (offset == PCI_VENDOR_ID && vendor)
*valuep = vendor;
else if (offset == PCI_DEVICE_ID && device)
*valuep = device;
return 0;
} else {
return ret == -ENODEV ? 0 : ret;
}
}
ops = pci_get_emul_ops(emul);
if (!ops || !ops->read_config)
return -ENOSYS;
return ops->read_config(emul, offset, valuep, size);
}
static int sandbox_pci_probe(struct udevice *dev)
{
struct sandbox_pci_priv *priv = dev_get_priv(dev);
const fdt32_t *cell;
u8 pdev, pfn, devfn;
int len;
cell = ofnode_get_property(dev_ofnode(dev), "sandbox,dev-info", &len);
if (!cell)
return 0;
if ((len % FDT_DEV_INFO_SIZE) == 0) {
int num = len / FDT_DEV_INFO_SIZE;
int i;
for (i = 0; i < num; i++) {
debug("dev info #%d: %02x %02x %04x %04x\n", i,
fdt32_to_cpu(cell[0]), fdt32_to_cpu(cell[1]),
fdt32_to_cpu(cell[2]), fdt32_to_cpu(cell[3]));
pdev = fdt32_to_cpu(cell[0]);
pfn = fdt32_to_cpu(cell[1]);
if (pdev > 31 || pfn > 7)
continue;
devfn = SANDBOX_PCI_DEVFN(pdev, pfn);
priv->vendev[devfn].vendor = fdt32_to_cpu(cell[2]);
priv->vendev[devfn].device = fdt32_to_cpu(cell[3]);
cell += FDT_DEV_INFO_CELLS;
}
}
return 0;
}
static const struct dm_pci_ops sandbox_pci_ops = {
.read_config = sandbox_pci_read_config,
.write_config = sandbox_pci_write_config,
};
static const struct udevice_id sandbox_pci_ids[] = {
{ .compatible = "sandbox,pci" },
{ }
};
U_BOOT_DRIVER(pci_sandbox) = {
.name = "pci_sandbox",
.id = UCLASS_PCI,
.of_match = sandbox_pci_ids,
.ops = &sandbox_pci_ops,
.probe = sandbox_pci_probe,
.priv_auto_alloc_size = sizeof(struct sandbox_pci_priv),
/* Attach an emulator if we can */
.child_post_bind = dm_scan_fdt_dev,
.per_child_platdata_auto_alloc_size =
sizeof(struct pci_child_platdata),
};