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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "gpio.h"
#include "link_defs.h"
#include "registers.h"
#include "usb_gpio.h"
void usb_gpio_tx(struct usb_gpio_config const *config)
{
size_t i;
uint32_t mask = 1;
uint32_t value = 0;
for (i = 0; i < config->num_gpios; ++i, mask <<= 1)
value |= (gpio_get_level(config->gpios[i])) ? mask : 0;
config->tx_ram[0] = value;
config->tx_ram[1] = value >> 16;
btable_ep[config->endpoint].tx_count = USB_GPIO_TX_PACKET_SIZE;
/*
* TX packet updated, mark the packet as VALID.
*/
STM32_TOGGLE_EP(config->endpoint, EP_TX_MASK, EP_TX_VALID, 0);
}
void usb_gpio_rx(struct usb_gpio_config const *config)
{
size_t i;
uint32_t mask = 1;
uint32_t set_mask = ((uint32_t)(config->rx_ram[0]) |
(uint32_t)(config->rx_ram[1]) << 16);
uint32_t clear_mask = ((uint32_t)(config->rx_ram[2]) |
(uint32_t)(config->rx_ram[3]) << 16);
uint32_t ignore_mask = set_mask & clear_mask;
config->state->set_mask = set_mask;
config->state->clear_mask = clear_mask;
if ((btable_ep[config->endpoint].rx_count & 0x3ff) ==
USB_GPIO_RX_PACKET_SIZE) {
for (i = 0; i < config->num_gpios; ++i, mask <<= 1) {
if (ignore_mask & mask)
;
else if (set_mask & mask)
gpio_set_level(config->gpios[i], 1);
else if (clear_mask & mask)
gpio_set_level(config->gpios[i], 0);
}
}
/*
* RX packet consumed, mark the packet as VALID.
*/
STM32_TOGGLE_EP(config->endpoint, EP_RX_MASK, EP_RX_VALID, 0);
}
void usb_gpio_event(struct usb_gpio_config const *config, enum usb_ep_event evt)
{
int i;
if (evt != USB_EVENT_RESET)
return;
i = config->endpoint;
btable_ep[i].tx_addr = usb_sram_addr(config->tx_ram);
btable_ep[i].tx_count = USB_GPIO_TX_PACKET_SIZE;
btable_ep[i].rx_addr = usb_sram_addr(config->rx_ram);
btable_ep[i].rx_count = ((USB_GPIO_RX_PACKET_SIZE / 2) << 10);
/*
* Initialize TX buffer with zero, the first IN transaction will fill
* this in with a valid value.
*/
config->tx_ram[0] = 0;
config->tx_ram[1] = 0;
STM32_USB_EP(i) = ((i << 0) | /* Endpoint Addr*/
(3 << 4) | /* TX Valid */
(0 << 9) | /* Bulk EP */
(3 << 12)); /* RX Valid */
}
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