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/*
* usb/endpt0.c -- USB endpoint 0 (control) handling
*
* Copyright (C) 2016-2017 Tomasz Kramkowski <tk@the-tk.com>
*
* 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 <arrlen.h>
#include <le.h>
#include <reg/usbotg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <reg/gpio.h>
#include "bdt.h"
#include "endpt0.h"
#include "endpt1.h"
#include "descriptors.h"
#define MAX_PACKET 64
static unsigned char buf[2][MAX_PACKET];
static bool tx_odd;
static bool tx_data01;
static volatile unsigned int nextaddr;
static void *tx_data;
static size_t tx_size;
struct tok_setup {
uint8_t reqtyp;
uint8_t req;
uint16_t value;
uint16_t index;
uint16_t length;
};
/* read_setup: parse a SETUP token's data */
static void read_setup(struct tok_setup *setup, const void *_data)
{
const unsigned char *data = _data;
setup->reqtyp = data[0];
setup->req = data[1];
setup->value = le16toh(&data[2]);
setup->index = le16toh(&data[4]);
setup->length = le16toh(&data[6]);
}
/* TODO: Make this a shared thing across all USB endpoints */
/* puttx: place data in the current buffer descriptor */
static bool puttx(void *data, size_t size)
{
if (GET_BIT(usb_bdt[0][BDT_TX][tx_odd].desc, BD_OWN))
return false;
/* TODO: Just stop bothering with const */
usb_bdt[0][BDT_TX][tx_odd].addr = data;
usb_bdt[0][BDT_TX][tx_odd].desc = USB0_BD_INIT(size, tx_data01);
tx_odd = !tx_odd;
tx_data01 = !tx_data01;
return true;
}
/* pushtx: attempt to push rest of the current transmission into a BD */
static bool pushtx(void)
{
size_t size = tx_size;
if (tx_data == NULL)
return false;
if (size > MAX_PACKET)
size = MAX_PACKET;
if (!puttx(tx_data, size))
return false;
tx_data = (char *)tx_data + size;
tx_size -= size;
if (tx_size == 0 && size < MAX_PACKET)
tx_data = NULL;
return true;
}
/* quetx: enqueue a transmission */
static void quetx(void *data, size_t size)
{
tx_data = data;
tx_size = size;
while (pushtx())
;
}
/* usb_endpt0_disable: Disable endpoint 0 (not valid) */
void usb_endpt0_disable(void)
{
}
/* usb_endpt0_enable: Enable and reset endpoint 0 */
void usb_endpt0_enable(void)
{
usb_bdt[0][BDT_RX][BDT_EVEN].addr = buf[0];
usb_bdt[0][BDT_RX][BDT_EVEN].desc = USB0_BD_INIT(sizeof buf[0], 0);
usb_bdt[0][BDT_RX][BDT_ODD].addr = buf[1];
usb_bdt[0][BDT_RX][BDT_ODD].desc = USB0_BD_INIT(sizeof buf[1], 0);
usb_bdt[0][BDT_TX][BDT_EVEN].addr = NULL;
usb_bdt[0][BDT_TX][BDT_EVEN].desc = 0;
usb_bdt[0][BDT_TX][BDT_ODD].addr = NULL;
usb_bdt[0][BDT_TX][BDT_ODD].desc = 0;
USB0_ENDPT(0) = BV(ENDPT_EPRXEN) | BV(ENDPT_EPTXEN) | BV(ENDPT_EPHSHK);
nextaddr = 0;
tx_data = NULL;
tx_odd = 0;
tx_data01 = 0;
}
/* trunc: truncate size_t to a limit TODO: MOVE THIS */
static inline size_t trunc(size_t val, size_t max)
{
if (val > max)
return max;
return val;
}
/* tok_setup: process a setup token */
static void tok_setup(struct tok_setup *setup)
{
switch (setup->reqtyp << 8 | setup->req) {
case 0x0005: /* SET ADDRESS */
nextaddr = setup->value;
puttx(NULL, 0);
break;
case 0x0009: /* SET CONFIGURATION */
usb_endpt1_enable();
puttx(NULL, 0);
break;
case 0x210a: /* SET IDLE */
puttx(NULL, 0);
break;
case 0x8106: /* GET INTERFACE */
case 0x8006: /* GET DESCRIPTOR */
switch (setup->value) {
case 0x0100: /* DEVICE */
quetx(ds_dev, trunc(ARRLEN(ds_dev), setup->length));
return;
case 0x0200: /* CONFIGURATION */
quetx(ds_conf, trunc(ARRLEN(ds_conf), setup->length));
return;
case 0x0300: /* STRING 0 */
quetx(ds_lang, trunc(ARRLEN(ds_lang), setup->length));
return;
case 0x0301: /* STRING 1 */
quetx(ds_str1, trunc(ARRLEN(ds_str1), setup->length));
return;
case 0x2200:
quetx(ds_hidrep, trunc(ARRLEN(ds_hidrep), setup->length));
return;
}
/* fall through */
default:
/* We received an unexpected SETUP so we STALL the endpoint */
SET_BIT(USB0_ENDPT(0), ENDPT_EPSTALL);
break;
}
}
void usb_endpt0_token(uint8_t state)
{
volatile struct usb0_bd *bd;
struct tok_setup setup;
bd = &usb_bdt[0][GET_BIT(state, STAT_TX)][GET_BIT(state, STAT_ODD)];
switch (GET_BITS(bd->desc, BD_TOK_PID)) {
case BD_TOK_PID_OUT:
bd->desc = USB0_BD_INIT(sizeof buf[0], 1);
break;
case BD_TOK_PID_IN:
if (nextaddr) {
USB0_ADDR = nextaddr;
nextaddr = 0;
}
break;
case BD_TOK_PID_SETUP:
read_setup(&setup, bd->addr);
bd->desc = USB0_BD_INIT(sizeof buf[0], 1);
usb_bdt[0][BDT_TX][BDT_EVEN].desc = 0;
usb_bdt[0][BDT_TX][BDT_ODD].desc = 0;
tx_data = NULL;
tx_data01 = 1;
tok_setup(&setup);
/* SETUP sets CTL_TXSUSPENDTOKENBUSY to suspend TX */
USB0_CTL = BV(CTL_USBENSOFEN);
break;
}
}
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