diff options
Diffstat (limited to 'chip/stm32/usb_isochronous.c')
| -rw-r--r-- | chip/stm32/usb_isochronous.c | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/chip/stm32/usb_isochronous.c b/chip/stm32/usb_isochronous.c deleted file mode 100644 index 792507aa75..0000000000 --- a/chip/stm32/usb_isochronous.c +++ /dev/null @@ -1,163 +0,0 @@ -/* 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; -} |