mirror of
https://github.com/genodelabs/genode.git
synced 2025-04-27 06:20:23 +00:00
328 lines
8.1 KiB
C++
328 lines
8.1 KiB
C++
/**
|
|
* \brief PL2303-USB-UART driver that exposes a terminal session
|
|
* \author Sebastian Sumpf
|
|
* \date 2014-12-17
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2014 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.
|
|
*/
|
|
|
|
#include <os/attached_ram_dataspace.h>
|
|
#include <os/ring_buffer.h>
|
|
#include <os/server.h>
|
|
#include <root/component.h>
|
|
#include <terminal_session/terminal_session.h>
|
|
#include <usb/usb.h>
|
|
|
|
constexpr bool verbose = false;
|
|
|
|
namespace Terminal {
|
|
class Main;
|
|
class Root_component;
|
|
class Session_component;
|
|
using namespace Genode;
|
|
}
|
|
|
|
|
|
namespace Usb {
|
|
struct Pl2303_driver;
|
|
using namespace Genode;
|
|
}
|
|
|
|
|
|
struct pl2303_config
|
|
{
|
|
Genode::uint32_t baud = 115200;
|
|
Genode::uint8_t stop_bits = 0;
|
|
Genode::uint8_t parity = 0;
|
|
Genode::uint8_t data_bits = 8;
|
|
} __attribute__((packed));
|
|
|
|
|
|
struct Usb::Pl2303_driver : Completion,
|
|
Ring_buffer<char, 4096, Ring_buffer_unsynchronized>
|
|
{
|
|
enum { VENDOR = 0x67b, PRODUCT = 0x2303 /* Prolific 2303 seriral port */ };
|
|
|
|
enum {
|
|
PACKET_BUFFER = 2, /* number of read packets */
|
|
RING_SIZE = 4096, /* size of ring buffer */
|
|
MAX_PACKET_SIZE = 256 /* max packet size for bulk request */
|
|
};
|
|
|
|
/* Pl2303 endpoints */
|
|
enum Endpoints { STATUS = 0, OUT = 1, IN = 2 };
|
|
|
|
Server::Entrypoint &ep;
|
|
Server::Signal_rpc_member<Pl2303_driver> dispatcher{ ep, *this, &Pl2303_driver::state_change };
|
|
Genode::Allocator_avl alloc;
|
|
Usb::Connection connection{ &alloc, VENDOR, PRODUCT, 512 * 1024, dispatcher };
|
|
Usb::Device device;
|
|
Signal_context_capability connected_sigh;
|
|
Signal_context_capability read_sigh;
|
|
|
|
|
|
Pl2303_driver(Server::Entrypoint &ep)
|
|
: ep(ep), alloc(Genode::env()->heap()),
|
|
device(Genode::env()->heap(), connection, ep)
|
|
{ }
|
|
|
|
|
|
/* send control message for to read/write from/to PL2303 endpoint */
|
|
void pl2303_magic(Usb::Interface &iface, uint16_t value, uint16_t index, bool read)
|
|
{
|
|
Usb::Packet_descriptor p = iface.alloc(0);
|
|
|
|
uint8_t request_type = read ? Usb::ENDPOINT_IN : Usb::ENDPOINT_OUT
|
|
| Usb::TYPE_VENDOR
|
|
| Usb::RECIPIENT_DEVICE;
|
|
|
|
iface.control_transfer(p, request_type, 1, value, index,100);
|
|
iface.release(p);
|
|
}
|
|
|
|
void pl2303_magic_read(Usb::Interface &iface, uint16_t value, uint16_t index) {
|
|
pl2303_magic(iface, value, index, true); }
|
|
|
|
void pl2303_magic_write(Usb::Interface &iface, uint16_t value, uint16_t index) {
|
|
pl2303_magic(iface, value, index, false); }
|
|
|
|
void bulk_packet(Packet_descriptor &p)
|
|
{
|
|
Interface iface = device.interface(0);
|
|
|
|
/* error or write packet */
|
|
if (!p.succeded || !p.is_read_transfer()) {
|
|
iface.release(p);
|
|
return;
|
|
}
|
|
|
|
/* buffer data */
|
|
bool send_sigh = empty() && p.transfer.actual_size;
|
|
char *data = (char *)iface.content(p);
|
|
|
|
try {
|
|
for (int i = 0; i < p.transfer.actual_size; i++)
|
|
add(data[i]);
|
|
} catch (Ring_buffer::Overflow) {
|
|
PWRN("Pl2303 buffer overflow");
|
|
}
|
|
|
|
/* submit back to device (async) */
|
|
iface.submit(p);
|
|
|
|
/* notify client */
|
|
if (send_sigh && read_sigh.valid())
|
|
Signal_transmitter(read_sigh).submit();
|
|
}
|
|
|
|
void complete(Packet_descriptor &p)
|
|
{
|
|
switch (p.type) {
|
|
case Packet_descriptor::BULK: bulk_packet(p); break;
|
|
default: break;
|
|
}
|
|
}
|
|
|
|
size_t write(void *dst, size_t num_bytes)
|
|
{
|
|
num_bytes = min(num_bytes, MAX_PACKET_SIZE);
|
|
|
|
Interface &iface = device.interface(0);
|
|
Endpoint &ep = iface.endpoint(OUT);
|
|
Packet_descriptor p = iface.alloc(num_bytes);
|
|
|
|
memcpy(iface.content(p), dst, num_bytes);
|
|
iface.bulk_transfer(p, ep, 0, false, this);
|
|
|
|
return num_bytes;
|
|
}
|
|
|
|
/**
|
|
* Init 2303 controller
|
|
*/
|
|
void init()
|
|
{
|
|
/* read device configuration */
|
|
device.update_config();
|
|
|
|
enum { BUF = 128 };
|
|
char buffer[BUF];
|
|
|
|
PINF("PL2303 controller: ready");
|
|
PINF("Manufacturer : %s", device.manufactorer_string.to_char(buffer, BUF));
|
|
PINF("Product : %s", device.product_string.to_char(buffer, BUF));
|
|
|
|
Interface &iface = device.interface(0);
|
|
iface.claim();
|
|
|
|
/* undocumented magic, taken from Linux and GRUB */
|
|
pl2303_magic_read (iface, 0x8484, 0x0000);
|
|
pl2303_magic_write(iface, 0x0404, 0x0000);
|
|
pl2303_magic_read (iface, 0x8484, 0x0000);
|
|
pl2303_magic_read (iface, 0x8383, 0x0000);
|
|
pl2303_magic_read (iface, 0x8484, 0x0000);
|
|
pl2303_magic_write(iface, 0x0404, 0x0001);
|
|
pl2303_magic_read (iface, 0x8484, 0x0000);
|
|
pl2303_magic_read (iface, 0x8383, 0x0000);
|
|
pl2303_magic_write(iface, 0x0000, 0x0001);
|
|
pl2303_magic_write(iface, 0x0001, 0x0000);
|
|
pl2303_magic_write(iface, 0x0002, 0x0044);
|
|
pl2303_magic_write(iface, 0x0008, 0x0000);
|
|
pl2303_magic_write(iface, 0x0009, 0x0000);
|
|
|
|
Usb::Packet_descriptor p = iface.alloc(sizeof(pl2303_config));
|
|
iface.control_transfer(p, 0xa1, 0x21, 0, 0, 100);
|
|
|
|
/* set baud rate to 115200 */
|
|
pl2303_config *cfg = (pl2303_config *)iface.content(p);
|
|
|
|
if (verbose)
|
|
PDBG("GET_LINE %u %u %u %u\n",
|
|
cfg->baud, cfg->stop_bits, cfg->parity, cfg->data_bits);
|
|
|
|
pl2303_config cfg_new;
|
|
*cfg = cfg_new;
|
|
|
|
if (verbose)
|
|
PDBG("SET_LINE %u %u %u %u\n",
|
|
cfg_new.baud, cfg_new.stop_bits, cfg_new.parity, cfg_new.data_bits);
|
|
|
|
iface.control_transfer(p, 0x21, 0x20, 0, 0, 100);
|
|
iface.release(p);
|
|
|
|
/* finish it */
|
|
pl2303_magic_write(iface, 0x0, 0x0);
|
|
|
|
/* submit read transfers (async) */
|
|
Usb::Endpoint &ep = iface.endpoint(IN);
|
|
for (int i = 0; i < PACKET_BUFFER; i++) {
|
|
p = iface.alloc(ep.max_packet_size);
|
|
iface.bulk_transfer(p, ep, 0, false, this);
|
|
}
|
|
|
|
/* send signal to terminal client */
|
|
if (connected_sigh.valid())
|
|
Signal_transmitter(connected_sigh).submit();
|
|
}
|
|
|
|
/**
|
|
* Called from USB driver when the desired device is active
|
|
*/
|
|
void state_change(unsigned)
|
|
{
|
|
if (connection.plugged()) {
|
|
if (verbose)
|
|
PDBG("Device: Plugged");
|
|
init();
|
|
}
|
|
else if (verbose)
|
|
PDBG("Device: Unplugged");
|
|
}
|
|
};
|
|
|
|
|
|
class Terminal::Session_component : public Rpc_object<Session, Session_component>
|
|
{
|
|
private:
|
|
|
|
Attached_ram_dataspace _io_buffer;
|
|
Usb::Pl2303_driver &_driver;
|
|
|
|
public:
|
|
|
|
Session_component(size_t io_buffer_size, Usb::Pl2303_driver &driver)
|
|
: _io_buffer(env()->ram_session(), io_buffer_size), _driver(driver)
|
|
{ }
|
|
|
|
void read_avail_sigh(Signal_context_capability sigh)
|
|
{
|
|
_driver.read_sigh = sigh;
|
|
}
|
|
|
|
void connected_sigh(Signal_context_capability sigh)
|
|
{
|
|
_driver.connected_sigh = sigh;
|
|
}
|
|
|
|
Size size() { return Size(0, 0); }
|
|
bool avail() { return !_driver.empty(); }
|
|
|
|
size_t _read(size_t dst_len)
|
|
{
|
|
size_t num_bytes = 0;
|
|
char *data = _io_buffer.local_addr<char>();
|
|
|
|
for (;num_bytes < dst_len && !_driver.empty(); num_bytes++)
|
|
data[num_bytes] = _driver.get();
|
|
|
|
return num_bytes;
|
|
}
|
|
|
|
void _write(size_t num_bytes)
|
|
{
|
|
char *dst = _io_buffer.local_addr<char>();
|
|
while (num_bytes) {
|
|
size_t size = _driver.write(dst, num_bytes);
|
|
num_bytes -= size;
|
|
dst += size;
|
|
}
|
|
}
|
|
|
|
Dataspace_capability _dataspace() { return _io_buffer.cap(); }
|
|
|
|
size_t read(void *buf, size_t) { return 0; }
|
|
size_t write(void const *buf, size_t) { return 0; }
|
|
};
|
|
|
|
|
|
class Terminal::Root_component : public Genode::Root_component<Session_component, Single_client>
|
|
{
|
|
private:
|
|
|
|
Usb::Pl2303_driver _driver;
|
|
|
|
protected:
|
|
|
|
Session_component *_create_session(char const *args)
|
|
{
|
|
size_t const io_buffer_size = 4096;
|
|
return new (md_alloc()) Session_component(io_buffer_size, _driver);
|
|
}
|
|
|
|
public:
|
|
|
|
Root_component(Server::Entrypoint &ep, Genode::Allocator &md_alloc)
|
|
: Genode::Root_component<Session_component, Genode::Single_client>(&ep.rpc_ep(), &md_alloc),
|
|
_driver(ep)
|
|
{ }
|
|
};
|
|
|
|
|
|
struct Terminal::Main
|
|
{
|
|
Server::Entrypoint &ep;
|
|
Sliced_heap heap = { env()->ram_session(), env()->rm_session() };
|
|
Root_component terminal_root = { ep, heap };
|
|
|
|
Main(Server::Entrypoint &ep) : ep(ep)
|
|
{
|
|
env()->parent()->announce(ep.manage(terminal_root));
|
|
}
|
|
};
|
|
|
|
|
|
namespace Server {
|
|
char const *name() { return "usb_terminal_ep"; };
|
|
size_t stack_size() { return 2*1024*sizeof(long); }
|
|
|
|
void construct(Entrypoint &ep)
|
|
{
|
|
static Terminal::Main server(ep);
|
|
}
|
|
}
|