#pypp 0
// Iris: micro-kernel for a capability-based operating system.
// boot-programs/udc.ccp: USB device controller driver.
// Copyright 2009 Bas Wijnen <wijnen@debian.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "iris.hh"
#include "devices.hh"
#define ARCH
#include "arch.hh"

class Udc:
	typedef unsigned char u8
	typedef unsigned short u16
	typedef unsigned int u32
	typedef u8 string
	// The ugly stuff is because pypp doesn't support __attribute__.
	/**/struct Setup {
		u8 request_type;
		u8 request;
		u16 value;
		u16 index;
		u16 length;
	 } __attribute__ ((packed))
	/**/struct Device {
		static u8 const Type = 1;
		u8 length;
		u8 type;
		u16 usb_version;
		u8 dev_class;
		u8 subclass;
		u8 protocol;
		u8 max_packet_size0;
		u16 vendor;
		u16 product;
		u16 dev_version;
		string s_manufacturer;
		string s_product;
		string s_serial;
		u8 num_configurations;
	 } __attribute__ ((packed))
	/**/struct Configuration {
		static u8 const Type = 2;
		u8 length;
		u8 type;
		u16 total_length;
		u8 num_interfaces;
		u8 configuration_value;
		u8 configuration;
		u8 attributes;
		u8 max_power;
	 } __attribute__ ((packed))
	/**/struct Interface {
		static u8 const Type = 4;
		u8 length;
		u8 type;
		u8 interface;
		u8 alternate;
		u8 num_endpoints;
		u8 iface_class;
		u8 subclass;
		u8 protocol;
		string name;
	 } __attribute__ ((packed))
	/**/struct Endpoint {
		static u8 const Type = 5;
		u8 length;
		u8 type;
		u8 address;
		u8 attributes;
		u16 max_packet_size;
		u8 interval;
	 } __attribute__ ((packed))
	/**/struct Device_Qualifier {
		static u8 const Type = 6;
		u8 length;
		u8 type;
		u16 version;
		u8 dev_class;
		u8 subclass;
		u8 protocol;
		u8 max_packet_size0;
		u8 num_configurations;
		u8 reserved;
	 } __attribute__ ((packed))
	/**/struct Langs {
		static u8 const Type = 3;
		u8 length;
		u8 type;
		u8 lang;
	 } __attribute__ ((packed))
	template <unsigned size> struct String {
		static u8 const Type = 3;
		u8 length;
		u8 type;
		u16 data[size];
	 } __attribute__ ((packed))
	static unsigned const max_packet_size0 = 64
	static unsigned const max_packet_size_bulk = 512
	enum Requests:
		GET_STATUS = 0
		CLEAR_FEATURE = 1
		SET_FEATURE = 3
		SET_ADDRESS = 5
		GET_DESCRIPTOR = 6
		SET_DESCRIPTOR = 7
		GET_CONFIGURATION = 8
		SET_CONFIGURATION = 9
		GET_INTERFACE = 10
		SET_INTERFACE = 11
		SYNCH_FRAME = 12
	enum Request_types:
		STANDARD_TO_DEVICE = 0
		VENDOR_TO_DEVICE = 0x40
		STANDARD_FROM_DEVICE = 0x80
		VENDOR_FROM_DEVICE = 0xc0
	enum Endpoint_types:
		CONTROL = 0
		ISOCHRONOUS = 1
		BULK = 2
		INTERRUPT = 3
	/**/struct my_config {
		Configuration config;
		Interface interface;
		Endpoint endpoint[2];
	 } __attribute__ ((packed))
	static Device device_descriptor
	//static Device_Qualifier device_qualifier_descriptor
	static my_config config_descriptor; //, other_config_descriptor
	static String <1> s_langs
	static String <6> s_manufacturer
	static String <16> s_product
	enum State:
		IDLE
		TX
		RX
	State state
	char configuration
	unsigned size
	char const *ptr
	bool rebooting
	bool vendor (Setup *s)
	bool get_descriptor (unsigned type, unsigned idx, unsigned len)
	bool handle_setup (Setup *s)
	char log_buffer[1000]
	unsigned log_buffer_size
	unsigned log_buffer_start
	public:
	void init ()
	void log (unsigned c)
	void interrupt ()

Udc::Device Udc::device_descriptor = { sizeof (Device), Device::Type, 0x200, 0, 0, 0, max_packet_size0, 0xfffe, 0x0002, 0x100, 1, 2, 0, 1 }
Udc::my_config Udc::config_descriptor = {
	(Configuration){ sizeof (Configuration), Configuration::Type, sizeof (my_config), 1, 1, 0, 0xc0, 1 },
	(Interface){ sizeof (Interface), Interface::Type, 0, 0, 2, 0xff, 0, 0x80, 0 }, {
		(Endpoint){ sizeof (Endpoint), Endpoint::Type, 1, BULK, max_packet_size_bulk, 0 },
		(Endpoint){ sizeof (Endpoint), Endpoint::Type, 0x81, BULK, max_packet_size_bulk, 0 }
	}
 }
Udc::String <1> Udc::s_langs = { sizeof (String <1>), String <1>::Type, { 0x0409 } }
Udc::String <6> Udc::s_manufacturer = { sizeof (String <6>), String <6>::Type, { 's', 'h', 'e', 'v', 'e', 'k' } }
Udc::String <16> Udc::s_product = { sizeof (String <16>), String <16>::Type, { 'I', 'r', 'i', 's', ' ', 'o', 'n', ' ', 'N', 'a', 'n', 'o', 'N', 'o', 't', 'e' } }

//Udc::Device_Qualifier const Udc::device_qualifier_descriptor = { sizeof (Device_Qualifier), Device_Qualifier::Type, 0x200, 0, 0, 0, max_packet_size0, 1, 0 }
//Udc::my_config const Udc::other_config_descriptor = {
//	(Configuration){ sizeof (Configuration), 7, sizeof (my_config), 1, 1, 0, 0xc0, 1 },
//	(Interface){ sizeof (Interface), Interface::Type, 0, 0, 2, 0xff, 0, 0x80, 0 }, {
//		(Endpoint){ sizeof (Endpoint), Endpoint::Type, 1, BULK, max_packet_size_bulk, 0 },
//		(Endpoint){ sizeof (Endpoint), Endpoint::Type, 0x81, BULK, max_packet_size_bulk, 0 }
//	}
// }

void Udc::init ():
	// Initialize the globals.  My method of compiling doesn't do that properly.
	device_descriptor = (Device){ sizeof (Device), Device::Type, 0x200, 0, 0, 0, max_packet_size0, 0xfffe, 0x0002, 0x100, 1, 2, 0, 1 }
	config_descriptor = (my_config){
		(Configuration){ sizeof (Configuration), Configuration::Type, sizeof (my_config), 1, 1, 0, 0xc0, 1 },
		(Interface){ sizeof (Interface), Interface::Type, 0, 0, 2, 0xff, 0, 0x80, 0 }, {
			(Endpoint){ sizeof (Endpoint), Endpoint::Type, 1, BULK, max_packet_size_bulk, 0 },
			(Endpoint){ sizeof (Endpoint), Endpoint::Type, 0x81, BULK, max_packet_size_bulk, 0 }
		}
	 }
	s_langs = (String <1>){ sizeof (String <1>), String <1>::Type, { 0x0409 } }
	s_manufacturer = (String <6>){ sizeof (String <6>), String <6>::Type, { 's', 'h', 'e', 'v', 'e', 'k' } }
	s_product = (String <16>){ sizeof (String <16>), String <16>::Type, { 'I', 'r', 'i', 's', ' ', 'o', 'n', ' ', 'N', 'a', 'n', 'o', 'N', 'o', 't', 'e' } }
	log_buffer_size = 0
	log_buffer_start = 0

	// Disconnect from the bus and don't try to get high-speed.
	UDC_POWER &= ~(UDC_POWER_SOFTCONN | UDC_POWER_HSENAB)
	state = IDLE
	configuration = 0
	size = 0
	// exit suspend mode by reading the interrupt register.
	cpm_start_udc ()
	unsigned i = UDC_INTRUSB
	// reset all pending endpoint interrupts.
	i = UDC_INTRIN
	i = UDC_INTROUT
	// enable interrupt on bus reset.
	UDC_INTRUSB = UDC_INTR_RESET
	// enable interrupts on endpoint 0.
	UDC_INTRINE |= 1 << 0
	UDC_INDEX = 0
	// Connect to the host.
	UDC_POWER |= UDC_POWER_SOFTCONN

bool Udc::vendor (Setup *s):
	if !(s->request_type & 0x80):
		return true
	if s->request == 10:
		static char b[2]
		ptr = b
		size = s->length < 2 ? s->length : 2
		b[0] = '#'
		if log_buffer_start == log_buffer_size:
			size = 1
		else:
			b[1] = log_buffer[log_buffer_start++]
		if log_buffer_start == log_buffer_size:
			log_buffer_start = 0
			log_buffer_size = 0
	else:
		static char const *name = "Reboot"
		ptr = name
		size = s->length < 6 ? s->length : 6
		rebooting = true
	state = TX
	return true

bool Udc::get_descriptor (unsigned type, unsigned idx, unsigned len):
	switch type:
		case Configuration::Type:
			if idx != 0:
				return false
			ptr = reinterpret_cast <char const *> (&config_descriptor)
			size = (len < sizeof (config_descriptor) ? len : sizeof (config_descriptor))
			break
		case Device::Type:
			if idx != 0:
				return false
			ptr = reinterpret_cast <char const *> (&device_descriptor)
			size = (len < sizeof (device_descriptor) ? len : sizeof (device_descriptor))
			break
		case Device_Qualifier::Type:
			//if idx != 0:
			//	return false
			//ptr = reinterpret_cast <char const *> (&device_qualifier_descriptor)
			//size = (len < sizeof (device_qualifier_descriptor) ? len : sizeof (device_qualifier_descriptor))
			//break
			return false
		// The 6 is an arbitrary number, except that String <6> in instantiated already.
		case String <6>::Type:
			switch idx:
				case 0:
					ptr = reinterpret_cast <char const *> (&s_langs)
					size = (len < sizeof (s_langs) ? len : sizeof (s_langs))
					break
				case 1:
					ptr = reinterpret_cast <char const *> (&s_manufacturer)
					size = (len < sizeof (s_manufacturer) ? len : sizeof (s_manufacturer))
					break
				case 2:
					ptr = reinterpret_cast <char const *> (&s_product)
					size = (len < sizeof (s_product) ? len : sizeof (s_product))
					break
				default:
					return false
			break
		default:
			return false
	state = TX
	return true

bool Udc::handle_setup (Setup *s):
	switch s->request_type:
		case STANDARD_TO_DEVICE:
			switch s->request:
				case SET_ADDRESS:
					UDC_FADDR = s->value
					break
				case SET_CONFIGURATION:
					if s->value >= 2:
						return false
					configuration = s->value
					break
				case SET_INTERFACE:
					if s->value != 0:
						return false
					break
				default:
					return false
			break
		case STANDARD_FROM_DEVICE:
			switch s->request:
				case GET_STATUS:
					ptr = "\0\0"
					size = (s->length < 2 ? s->length : 2)
					state = TX
					break
				case GET_DESCRIPTOR:
					return get_descriptor ((s->value >> 8) & 0xff, s->value & 0xff, s->length)
				case GET_CONFIGURATION:
					ptr = &configuration
					size = (s->length < 1 ? s->length : 1)
					state = TX
					break
				case GET_INTERFACE:
					ptr = "\0"
					size = (s->length < 1 ? s->length : 1)
					state = TX
					break
				default:
					return false
			break
		case VENDOR_TO_DEVICE:
		case VENDOR_FROM_DEVICE:
			return vendor (s)
		default:
			return false
	return true

void Udc::interrupt ():
	unsigned i = UDC_INTRUSB
	if i & UDC_INTR_RESET:
		state = IDLE
		return
	i = UDC_INTRIN
	if i & (1 << 0):
		// Interrupt on endpoint 0.
		unsigned csr = UDC_CSR0
		if csr & UDC_CSR0_SENTSTALL:
			csr &= ~(UDC_CSR0_SENTSTALL | UDC_CSR0_SENDSTALL)
			state = IDLE
		if csr & UDC_CSR0_SETUPEND:
			csr |= UDC_CSR0_SVDSETUPEND
			state = IDLE
		switch state:
			case IDLE:
				if rebooting:
					Kernel::reboot ()
				if !(csr & UDC_CSR0_OUTPKTRDY):
					return
				union { unsigned d[2]; Setup s; } packet
				packet.d[0] = UDC_FIFO (0)
				packet.d[1] = UDC_FIFO (0)
				UDC_CSR0 = csr | UDC_CSR0_DATAEND | UDC_CSR0_SVDOUTPKTRDY
				if !handle_setup (&packet.s):
					csr |= UDC_CSR0_SENDSTALL
					break
				if size == 0:
					return
				// Fall through.
			case TX:
				unsigned i
				for i = 0; (size & ~3) > 0 && i < max_packet_size0; i += 4, size -= 4:
					UDC_FIFO (0) = *(unsigned *)ptr
					ptr += 4
				for ; size > 0 && i < max_packet_size0; ++i, --size:
					UDC_FIFO8 (0) = *ptr++
				if i == max_packet_size0:
					csr |= UDC_CSR0_INPKTRDY
				else:
					state = IDLE
					csr |= UDC_CSR0_INPKTRDY | UDC_CSR0_DATAEND
				break
			case RX:
				// Not supported.
				csr |= UDC_CSR0_SVDOUTPKTRDY | UDC_CSR0_SENDSTALL
				state = IDLE
				break
		UDC_CSR0 = csr

void Udc::log (unsigned c):
	if log_buffer_size >= sizeof (log_buffer):
		return
	log_buffer[log_buffer_size++] = c

enum pdata:
	LOG = 32
	FS

Kernel::Num start ():
	map_udc ()
	map_gpio ()
	map_cpm ()
	Udc udc

	Kernel::Cap logcap = Kernel::my_receiver.create_capability (LOG)
	__asm__ volatile ("li $a0, 1\nlw $a1, %0\nbreak" :: "m"(logcap.code): "a0", "a1", "memory")
	udc.init ()
	Kernel::register_interrupt (IRQ_UDC)
	Device fs_dev = Kernel::my_receiver.create_capability (FS)
	Kernel::my_parent.provide_device <Directory> (fs_dev)
	Kernel::Num current_user = 0
	unsigned next_user
	while true:
		Kernel::wait ()
		switch Kernel::recv.protected_data.h:
			case 0:
				switch Kernel::recv.protected_data.l:
					case IRQ_UDC:
						udc.interrupt ()
						Kernel::register_interrupt (IRQ_UDC)
						break
					case LOG:
						udc.log (Kernel::recv.data[0].l)
						break
					case FS:
						switch Kernel::recv.data[0].l:
							case Device::CREATE_USER:
								Kernel::Cap reply = Kernel::get_reply ()
								Kernel::Cap c = Kernel::my_receiver.create_capability (Kernel::Num (next_user++, FS))
								reply.invoke (0, 0, c.copy ())
								Kernel::free_cap (c)
								Kernel::free_cap (reply)
								break
							case Device::DESTROY_USER:
								Kernel::Cap reply = Kernel::get_reply ()
								reply.invoke ()
								Kernel::free_cap (reply)
								break
							case Device::USE:
								Kernel::Cap reply = Kernel::get_reply ()
								Kernel::Cap arg = Kernel::get_arg ()
								current_user = Kernel::my_receiver.get_protected (arg)
								reply.invoke ()
								Kernel::free_cap (reply)
								Kernel::free_cap (arg)
								break
							case Device::UNUSE:
								Kernel::Cap reply = Kernel::get_reply ()
								Kernel::Cap arg = Kernel::get_arg ()
								if current_user.value () == Kernel::my_receiver.get_protected (arg).value ():
									current_user = 0
								reply.invoke ()
								Kernel::free_cap (reply)
								Kernel::free_cap (arg)
								break
						break
					default:
						udc.log ('~')
						char digit[] = "0123456789abcdef"
						for unsigned i = 0; i < 8; ++i:
							udc.log (digit[(Kernel::recv.protected_data.l >> (4 * (7 - i))) & 0xf])
						udc.log ('\n')
						break
			case FS:
				if current_user.value () != Kernel::recv.protected_data.value ():
					break
				switch Kernel::recv.data[0].l:
					case Directory::GET_SIZE:
					case Directory::GET_NAME:
					case Directory::GET_FILE_RO:
					case Directory::LOCK_RO:
					case Directory::UNLOCK_RO:
						Kernel::recv.reply.invoke ()
						break
					case Directory::GET_FILE_INFO:
					default:
						Kernel::recv.reply.invoke (~0)
						break