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#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 "descriptors.h"
#define MAX_PACKET 64
static unsigned char buf[2][MAX_PACKET];
static bool odd;
static bool data01;
static volatile unsigned int nextaddr;
static const 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(const void *data, size_t size)
{
if (GET_BIT(BDT_ENDPT(0, BDT_TX, odd).desc, BD_OWN))
return false;
BDT_ENDPT(0, BDT_TX, odd).addr = (void *)data;
BDT_ENDPT(0, BDT_TX, odd).desc = USB0_BD_INIT(size, data01);
odd = !odd;
data01 = !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 = (const 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(const 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)
{
BDT_ENDPT(0, BDT_RX, BDT_EVEN).addr = buf[0];
BDT_ENDPT(0, BDT_RX, BDT_EVEN).desc = USB0_BD_INIT(sizeof buf[0], 0);
BDT_ENDPT(0, BDT_RX, BDT_ODD).addr = buf[1];
BDT_ENDPT(0, BDT_RX, BDT_ODD).desc = USB0_BD_INIT(sizeof buf[1], 0);
BDT_ENDPT(0, BDT_TX, BDT_EVEN).addr = NULL;
BDT_ENDPT(0, BDT_TX, BDT_EVEN).desc = 0;
BDT_ENDPT(0, BDT_TX, BDT_ODD).addr = NULL;
BDT_ENDPT(0, BDT_TX, BDT_ODD).desc = 0;
USB0_ENDPT(0) = BV(ENDPT_EPRXEN) | BV(ENDPT_EPTXEN) | BV(ENDPT_EPHSHK);
nextaddr = 0;
tx_data = NULL;
odd = 0;
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 */
puttx(NULL, 0);
break;
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;
}
/* fall through */
default:
SET_BIT(USB0_ENDPT(0), ENDPT_EPSTALL);
break;
}
}
void usb_endpt0_token(uint8_t state)
{
struct usb0_bd *bd;
struct tok_setup setup;
bd = &BDT_ENDPT(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:
pushtx();
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);
BDT_ENDPT(0, BDT_TX, BDT_EVEN).desc = 0;
BDT_ENDPT(0, BDT_TX, BDT_ODD).desc = 0;
tx_data = NULL;
data01 = 1;
tok_setup(&setup);
break;
}
USB0_CTL = BV(CTL_USBENSOFEN);
}
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