Commit 36d0d3b4 authored by Simon Glass's avatar Simon Glass
Browse files

dm: sandbox: pci: Add a PCI emulation uclass



Since sandbox does not have real devices (unless it borrows those from the
host) it must use emulations. Provide a uclass which permits PCI operations
to be passed through to an emulation device.
Signed-off-by: default avatarSimon Glass <sjg@chromium.org>
parent 537849aa
......@@ -8,6 +8,7 @@
ifneq ($(CONFIG_DM_PCI),)
obj-$(CONFIG_PCI) += pci-uclass.o pci_compat.o
obj-$(CONFIG_PCI_SANDBOX) += pci_sandbox.o
obj-$(CONFIG_SANDBOX) += pci-emul-uclass.o
else
obj-$(CONFIG_PCI) += pci.o
endif
......
/*
* Copyright (c) 2014 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <libfdt.h>
#include <pci.h>
#include <dm/lists.h>
DECLARE_GLOBAL_DATA_PTR;
struct sandbox_pci_priv {
int dev_count;
};
int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
struct udevice **emulp)
{
struct udevice *dev;
int ret;
ret = pci_bus_find_devfn(bus, find_devfn, &dev);
if (ret) {
debug("%s: Could not find emulator for dev %x\n", __func__,
find_devfn);
return ret;
}
ret = device_find_first_child(dev, emulp);
if (ret)
return ret;
return *emulp ? 0 : -ENODEV;
}
static int sandbox_pci_emul_post_probe(struct udevice *dev)
{
struct sandbox_pci_priv *priv = dev->uclass->priv;
priv->dev_count++;
sandbox_set_enable_pci_map(true);
return 0;
}
static int sandbox_pci_emul_pre_remove(struct udevice *dev)
{
struct sandbox_pci_priv *priv = dev->uclass->priv;
priv->dev_count--;
sandbox_set_enable_pci_map(priv->dev_count > 0);
return 0;
}
UCLASS_DRIVER(pci_emul) = {
.id = UCLASS_PCI_EMUL,
.name = "pci_emul",
.post_probe = sandbox_pci_emul_post_probe,
.pre_remove = sandbox_pci_emul_pre_remove,
.priv_auto_alloc_size = sizeof(struct sandbox_pci_priv),
};
......@@ -20,6 +20,7 @@ enum uclass_id {
UCLASS_TEST_BUS,
UCLASS_SPI_EMUL, /* sandbox SPI device emulator */
UCLASS_I2C_EMUL, /* sandbox I2C device emulator */
UCLASS_PCI_EMUL, /* sandbox PCI device emulator */
UCLASS_SIMPLE_BUS,
/* U-Boot uclasses start here */
......
......@@ -992,6 +992,114 @@ static inline int pci_read_config_byte(pci_dev_t pcidev, int offset,
return pci_read_config8(pcidev, offset, valuep);
}
/**
* struct dm_pci_emul_ops - PCI device emulator operations
*/
struct dm_pci_emul_ops {
/**
* get_devfn(): Check which device and function this emulators
*
* @dev: device to check
* @return the device and function this emulates, or -ve on error
*/
int (*get_devfn)(struct udevice *dev);
/**
* read_config() - Read a PCI configuration value
*
* @dev: Emulated device to read from
* @offset: Byte offset within the device's configuration space
* @valuep: Place to put the returned value
* @size: Access size
* @return 0 if OK, -ve on error
*/
int (*read_config)(struct udevice *dev, uint offset, ulong *valuep,
enum pci_size_t size);
/**
* write_config() - Write a PCI configuration value
*
* @dev: Emulated device to write to
* @offset: Byte offset within the device's configuration space
* @value: Value to write
* @size: Access size
* @return 0 if OK, -ve on error
*/
int (*write_config)(struct udevice *dev, uint offset, ulong value,
enum pci_size_t size);
/**
* read_io() - Read a PCI I/O value
*
* @dev: Emulated device to read from
* @addr: I/O address to read
* @valuep: Place to put the returned value
* @size: Access size
* @return 0 if OK, -ENOENT if @addr is not mapped by this device,
* other -ve value on error
*/
int (*read_io)(struct udevice *dev, unsigned int addr, ulong *valuep,
enum pci_size_t size);
/**
* write_io() - Write a PCI I/O value
*
* @dev: Emulated device to write from
* @addr: I/O address to write
* @value: Value to write
* @size: Access size
* @return 0 if OK, -ENOENT if @addr is not mapped by this device,
* other -ve value on error
*/
int (*write_io)(struct udevice *dev, unsigned int addr,
ulong value, enum pci_size_t size);
/**
* map_physmem() - Map a device into sandbox memory
*
* @dev: Emulated device to map
* @addr: Memory address, normally corresponding to a PCI BAR.
* The device should have been configured to have a BAR
* at this address.
* @lenp: On entry, the size of the area to map, On exit it is
* updated to the size actually mapped, which may be less
* if the device has less space
* @ptrp: Returns a pointer to the mapped address. The device's
* space can be accessed as @lenp bytes starting here
* @return 0 if OK, -ENOENT if @addr is not mapped by this device,
* other -ve value on error
*/
int (*map_physmem)(struct udevice *dev, phys_addr_t addr,
unsigned long *lenp, void **ptrp);
/**
* unmap_physmem() - undo a memory mapping
*
* This must be called after map_physmem() to undo the mapping.
* Some devices can use this to check what has been written into
* their mapped memory and perform an operations they require on it.
* In this way, map/unmap can be used as a sort of handshake between
* the emulated device and its users.
*
* @dev: Emuated device to unmap
* @vaddr: Mapped memory address, as passed to map_physmem()
* @len: Size of area mapped, as returned by map_physmem()
* @return 0 if OK, -ve on error
*/
int (*unmap_physmem)(struct udevice *dev, const void *vaddr,
unsigned long len);
};
/* Get access to a PCI device emulator's operations */
#define pci_get_emul_ops(dev) ((struct dm_pci_emul_ops *)(dev)->driver->ops)
/**
* sandbox_pci_get_emul() - Get the emulation device for a PCI device
*
* Searches for a suitable emulator for the given PCI bus device
*
* @bus: PCI bus to search
* @find_devfn: PCI device and function address (PCI_DEVFN())
* @emulp: Returns emulated device if found
* @return 0 if found, -ENODEV if not found
*/
int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
struct udevice **emulp);
#endif
#endif /* __ASSEMBLY__ */
......
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