genode/os/include/pci_device/pci_device.h

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2011-12-22 15:19:25 +00:00
/*
* \brief PCI-device interface
* \author Norman Feske
* \date 2008-01-28
*/
/*
* Copyright (C) 2008-2011 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__PCI_DEVICE__PCI_DEVICE_H_
#define _INCLUDE__PCI_DEVICE__PCI_DEVICE_H_
#include <base/rpc.h>
namespace Pci {
struct Device
{
class Resource
{
private:
unsigned _bar; /* content of base-address register */
unsigned _size; /* resource size */
public:
/**
* Resource type, either port I/O resource or memory-mapped resource
*/
enum Type { IO, MEMORY, INVALID };
/**
* Default constructor
*/
Resource() { }
/**
* Constructor
*
* \param bar content of base-address register
* \param size resource size
*
* This constructor is only used by the PCI bus driver
* that implements the server-side of the the PCI session.
* If bar is set to zero, the constructed resource description
* represents an INVALID resource.
*/
Resource(unsigned bar, unsigned size)
: _bar(bar), _size(size) { }
/**
* Return base address of resource
*/
unsigned base()
{
/*
* Mask out the resource-description bits of the base
* address register. I/O resources use the lowest 3
* bits, memory resources use the lowest 4 bits.
*/
return _bar & ((type() == IO) ? ~7 : ~15);
}
/**
* Return resource size in bytes
*/
unsigned size() { return _size; }
/**
* Return true if resource is prefetchable memory
*/
bool prefetchable()
{
return type() == MEMORY && (_bar & (1 << 3));
}
/**
* Return resource type
*/
Type type()
{
if (_bar == 0)
return INVALID;
return (_bar & 1) ? IO : MEMORY;
}
/**
* Return raw register content
*/
unsigned bar() const { return _bar; }
};
enum { NUM_RESOURCES = 6 };
virtual ~Device() { }
/**
* Return bus, device, and function number of the device
*/
virtual void bus_address(unsigned char *bus, unsigned char *dev,
unsigned char *fn) = 0;
/**
* Return vendor ID obtained from the PCI config space
*/
virtual unsigned short vendor_id() = 0;
/**
* Return device ID obtained from the PCI config space
*/
virtual unsigned short device_id() = 0;
/**
* Return device class code from the PCI config space
*/
virtual unsigned class_code() = 0;
/**
* Query PCI-resource information
*
* \param resource_id index of according PCI resource of the device
*
* \return resource description
* \retval INVALID the supplied resource ID is invalid
*/
virtual Resource resource(int resource_id) = 0;
/**
* Access size for operations directly accessing the config space
*/
enum Access_size { ACCESS_8BIT, ACCESS_16BIT, ACCESS_32BIT };
/**
* Read configuration space
*/
virtual unsigned config_read(unsigned char address, Access_size size) = 0;
/**
* Write configuration space
*/
virtual void config_write(unsigned char address, unsigned value,
Access_size size) = 0;
/***************************
** Convenience functions **
***************************/
/*
* The base classes are defined as follows:
*
* 0x00 | legacy device
* 0x01 | mass-storage controller
* 0x02 | network controller
* 0x03 | display controller
* 0x04 | multimedia device
* 0x05 | memory controller
* 0x06 | bridge device
* 0x07 | simple-communication controller
* 0x08 | base-system peripheral
* 0x09 | input device
* 0x0a | docking station
* 0x0b | processor
* 0x0c | serial bus controller
* 0x0d | wireless controller
* 0x0e | intelligent I/O controller
* 0x0f | satellite-communications controller
* 0x10 | encryption/decryption controller
* 0x11 | data-acquisition and signal-processing controller
* 0x12 | reserved
* ... |
* 0xff | device does not fit in any of the defined classes
*/
unsigned base_class() { return class_code() >> 16; }
unsigned sub_class() { return (class_code() >> 8) & 0xff; }
/*********************
** RPC declaration **
*********************/
GENODE_RPC(Rpc_bus_address, void, bus_address,
unsigned char *, unsigned char *, unsigned char *);
GENODE_RPC(Rpc_vendor_id, unsigned short, vendor_id);
GENODE_RPC(Rpc_device_id, unsigned short, device_id);
GENODE_RPC(Rpc_class_code, unsigned, class_code);
GENODE_RPC(Rpc_resource, Resource, resource, int);
GENODE_RPC(Rpc_config_read, unsigned, config_read,
unsigned char, Access_size);
GENODE_RPC(Rpc_config_write, void, config_write,
unsigned char, unsigned, Access_size);
GENODE_RPC_INTERFACE(Rpc_bus_address, Rpc_vendor_id, Rpc_device_id,
Rpc_class_code, Rpc_resource, Rpc_config_read,
Rpc_config_write);
};
}
#endif /* _INCLUDE__PCI_DEVICE__PCI_DEVICE_H_ */