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x86: support PIT via platform driver

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Issue #1578
This commit is contained in:
Alexander Boettcher 2016-07-11 11:59:32 +02:00 committed by Christian Helmuth
parent ef7c51548d
commit 7b35927147
1 changed files with 36 additions and 2 deletions
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38
repos/os/src/drivers/platform/spec/x86/nonpci_devices.cc
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@ -14,7 +14,7 @@
#include "irq.h"
namespace Nonpci { class Ps2; }
namespace Nonpci { class Ps2; class Pit; }
class Nonpci::Ps2 : public Platform::Device_component
{
@ -82,6 +82,37 @@ class Nonpci::Ps2 : public Platform::Device_component
};
class Nonpci::Pit : public Platform::Device_component
{
private:
enum {
IRQ_PIT = 0,
PIT_PORT = 0x40,
PORTS_WIDTH = 4
};
Genode::Io_port_connection _ports;
public:
Pit(Genode::Rpc_entrypoint * ep, Platform::Session_component * session)
:
Platform::Device_component(ep, session, IRQ_PIT),
_ports(PIT_PORT, PORTS_WIDTH)
{ }
Genode::Io_port_session_capability io_port(Genode::uint8_t io_port) override
{
if (io_port == 0)
return _ports.cap();
return Genode::Io_port_session_capability();
}
};
/**
* Platform session component devices which are non PCI devices, e.g. PS2
*/
@ -93,7 +124,7 @@ Platform::Device_capability Platform::Session_component::device(String const &na
using namespace Genode;
char const * device_name = name.string();
const char * devices [] = { "PS2" };
const char * devices [] = { "PS2", "PIT" };
unsigned devices_i = 0;
for (; devices_i < sizeof(devices) / sizeof(devices[0]); devices_i++)
@ -118,6 +149,9 @@ Platform::Device_capability Platform::Session_component::device(String const &na
case 0:
dev = new (_md_alloc) Nonpci::Ps2(_ep, this);
break;
case 1:
dev = new (_md_alloc) Nonpci::Pit(_ep, this);
break;
default:
return Device_capability();
}