164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/* Copyright 2017 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 "stddef.h"
|
|
#include "common.h"
|
|
#include "config.h"
|
|
#include "link_defs.h"
|
|
#include "registers.h"
|
|
#include "util.h"
|
|
#include "usb_api.h"
|
|
#include "usb_hw.h"
|
|
#include "usb_isochronous.h"
|
|
|
|
|
|
/* Console output macro */
|
|
#define CPRINTF(format, args...) cprintf(CC_USB, format, ## args)
|
|
#define CPRINTS(format, args...) cprints(CC_USB, format, ## args)
|
|
|
|
/*
|
|
* Currently, we only support TX direction for USB isochronous transfer.
|
|
*
|
|
* According to RM0091, isochronous transfer is always double buffered.
|
|
* Addresses of buffers are pointed by `btable_ep[<endpoint>].tx_addr` and
|
|
* `btable_ep[<endpoint>].rx_addr`.
|
|
*
|
|
* DTOG | USB Buffer | App Buffer
|
|
* -----+------------+-----------
|
|
* 0 | tx_addr | rx_addr
|
|
* 1 | rx_addr | tx_addr
|
|
*
|
|
* That is, when DTOG bit is 0 (see `get_tx_dtog()`), USB hardware will read
|
|
* from `tx_addr`, and our application can write new data to `rx_addr` at the
|
|
* same time.
|
|
*
|
|
* Number of bytes in each buffer shall be tracked by `tx_count` and `rx_count`
|
|
* respectively.
|
|
*
|
|
* `get_app_addr()`, `set_app_count()` help you to to select the correct
|
|
* variable to use by given DTOG value, which is available by `get_tx_dtog()`.
|
|
*/
|
|
|
|
/*
|
|
* Gets current DTOG value of given `config`.
|
|
*/
|
|
static int get_tx_dtog(struct usb_isochronous_config const *config)
|
|
{
|
|
return !!(STM32_USB_EP(config->endpoint) & EP_TX_DTOG);
|
|
}
|
|
|
|
/*
|
|
* Gets buffer address that can be used by software (application).
|
|
*
|
|
* The mapping between application buffer address and current TX DTOG value is
|
|
* shown in table above.
|
|
*/
|
|
static usb_uint *get_app_addr(struct usb_isochronous_config const *config,
|
|
int dtog_value)
|
|
{
|
|
return config->tx_ram[dtog_value];
|
|
}
|
|
|
|
/*
|
|
* Sets number of bytes written to application buffer.
|
|
*/
|
|
static void set_app_count(struct usb_isochronous_config const *config,
|
|
int dtog_value,
|
|
usb_uint count)
|
|
{
|
|
if (dtog_value)
|
|
btable_ep[config->endpoint].tx_count = count;
|
|
else
|
|
btable_ep[config->endpoint].rx_count = count;
|
|
}
|
|
|
|
int usb_isochronous_write_buffer(
|
|
struct usb_isochronous_config const *config,
|
|
const uint8_t *src,
|
|
size_t n,
|
|
size_t dst_offset,
|
|
int *buffer_id,
|
|
int commit)
|
|
{
|
|
int dtog_value = get_tx_dtog(config);
|
|
usb_uint *buffer = get_app_addr(config, dtog_value);
|
|
uintptr_t ptr = usb_sram_addr(buffer);
|
|
|
|
if (*buffer_id == -1)
|
|
*buffer_id = dtog_value;
|
|
else if (dtog_value != *buffer_id)
|
|
return -EC_ERROR_TIMEOUT;
|
|
|
|
if (dst_offset > config->tx_size)
|
|
return -EC_ERROR_INVAL;
|
|
|
|
n = MIN(n, config->tx_size - dst_offset);
|
|
memcpy_to_usbram((void *)(ptr + dst_offset), src, n);
|
|
|
|
if (commit)
|
|
set_app_count(config, dtog_value, dst_offset + n);
|
|
|
|
return n;
|
|
}
|
|
|
|
void usb_isochronous_init(struct usb_isochronous_config const *config)
|
|
{
|
|
int ep = config->endpoint;
|
|
|
|
btable_ep[ep].tx_addr = usb_sram_addr(get_app_addr(config, 1));
|
|
btable_ep[ep].rx_addr = usb_sram_addr(get_app_addr(config, 0));
|
|
set_app_count(config, 0, 0);
|
|
set_app_count(config, 1, 0);
|
|
|
|
STM32_USB_EP(ep) = ((ep << 0) | /* Endpoint Addr */
|
|
EP_TX_VALID | /* start transmit */
|
|
(2 << 9) | /* ISO EP */
|
|
EP_RX_DISAB);
|
|
}
|
|
|
|
void usb_isochronous_event(struct usb_isochronous_config const *config,
|
|
enum usb_ep_event evt)
|
|
{
|
|
if (evt == USB_EVENT_RESET)
|
|
usb_isochronous_init(config);
|
|
}
|
|
|
|
void usb_isochronous_tx(struct usb_isochronous_config const *config)
|
|
{
|
|
/*
|
|
* Clear CTR_TX, note that EP_TX_VALID will *NOT* be cleared by
|
|
* hardware, so we don't need to toggle it.
|
|
*/
|
|
STM32_TOGGLE_EP(config->endpoint, 0, 0, 0);
|
|
/*
|
|
* Clear buffer count for buffer we just transmitted, so we do not
|
|
* transmit the data twice.
|
|
*/
|
|
set_app_count(config, get_tx_dtog(config), 0);
|
|
|
|
config->tx_callback(config);
|
|
}
|
|
|
|
int usb_isochronous_iface_handler(struct usb_isochronous_config const *config,
|
|
usb_uint *ep0_buf_rx,
|
|
usb_uint *ep0_buf_tx)
|
|
{
|
|
int ret = -1;
|
|
|
|
if (ep0_buf_rx[0] == (USB_DIR_OUT |
|
|
USB_TYPE_STANDARD |
|
|
USB_RECIP_INTERFACE |
|
|
USB_REQ_SET_INTERFACE << 8)) {
|
|
ret = config->set_interface(ep0_buf_rx[1], ep0_buf_rx[2]);
|
|
|
|
if (ret == 0) {
|
|
/* ACK */
|
|
btable_ep[0].tx_count = 0;
|
|
STM32_TOGGLE_EP(0, EP_TX_RX_MASK, EP_TX_RX_VALID, 0);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|