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ChibiOS-Contrib/os/hal/ports/GD/GD32VF103/OTG/hal_usb_lld.c

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/*
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
ChibiOS - Copyright (C) 2021 Stefan Kerkmann
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file OTG/hal_usb_lld.c
* @brief GD32 USB subsystem low level driver source.
*
* @addtogroup USB
* @{
*/
#include <string.h>
#include "hal.h"
#if HAL_USE_USB || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#define TRDT_VALUE_FS 5
#define TRDT_VALUE_HS 9
#define EP0_MAX_INSIZE 64
#define EP0_MAX_OUTSIZE 64
#if defined(BOARD_USBFS_NOVBUSSENS)
#define GCCFG_INIT_VALUE (GCCFG_VBUSIG | GCCFG_VBUSACEN | \
GCCFG_VBUSBCEN | GCCFG_PWRON)
#else
#define GCCFG_INIT_VALUE (GCCFG_VBUSACEN | GCCFG_VBUSBCEN | \
GCCFG_PWRON)
#endif
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/** @brief USBFS driver identifier.*/
#if GD32_USB_USE_USBFS || defined(__DOXYGEN__)
USBDriver USBD1;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/**
* @brief EP0 state.
* @note It is an union because IN and OUT endpoints are never used at the
* same time for EP0.
*/
static union {
/**
* @brief IN EP0 state.
*/
USBInEndpointState in;
/**
* @brief OUT EP0 state.
*/
USBOutEndpointState out;
} ep0_state;
/**
* @brief Buffer for the EP0 setup packets.
*/
static uint8_t ep0setup_buffer[8];
/**
* @brief EP0 initialization structure.
*/
static const USBEndpointConfig ep0config = {
USB_EP_MODE_TYPE_CTRL,
_usb_ep0setup,
_usb_ep0in,
_usb_ep0out,
0x40,
0x40,
&ep0_state.in,
&ep0_state.out,
1,
ep0setup_buffer
};
#if GD32_USB_USE_USBFS
static const gd32_usbfs_params_t fsparams = {
GD32_USB_USBFS_RX_FIFO_SIZE / 4,
GD32_USBFS_FIFO_MEM_SIZE,
GD32_USBFS_ENDPOINTS
};
#endif
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
static void otg_core_reset(USBDriver *usbp) {
gd32_usbfs_t *otgp = usbp->otg;
/* Core reset and delay of at least 3 PHY cycles.*/
otgp->GRSTCTL = GRSTCTL_CSRST;
osalSysPolledDelayX(12);
while ((otgp->GRSTCTL & GRSTCTL_CSRST) != 0)
;
osalSysPolledDelayX(18);
}
static void otg_disable_ep(USBDriver *usbp) {
gd32_usbfs_t *otgp = usbp->otg;
unsigned i;
for (i = 0; i <= usbp->otgparams->num_endpoints; i++) {
if ((otgp->ie[i].DIEPCTL & DIEPCTL_EPEN) != 0U) {
otgp->ie[i].DIEPCTL |= DIEPCTL_EPD;
}
if ((otgp->oe[i].DOEPCTL & DIEPCTL_EPEN) != 0U) {
otgp->oe[i].DOEPCTL |= DIEPCTL_EPD;
}
otgp->ie[i].DIEPINTF = 0xFFFFFFFF;
otgp->oe[i].DOEPINTF = 0xFFFFFFFF;
}
otgp->DAEPINTEN = DAEPINTEN_OEPIE(0) | DAEPINTEN_IEPIE(0);
}
static void otg_rxfifo_flush(USBDriver *usbp) {
gd32_usbfs_t *otgp = usbp->otg;
otgp->GRSTCTL = GRSTCTL_RXFF;
while ((otgp->GRSTCTL & GRSTCTL_RXFF) != 0)
;
/* Wait for 3 PHY Clocks.*/
osalSysPolledDelayX(18);
}
static void otg_txfifo_flush(USBDriver *usbp, uint32_t fifo) {
gd32_usbfs_t *otgp = usbp->otg;
otgp->GRSTCTL = GRSTCTL_TXFNUM(fifo) | GRSTCTL_TXFF;
while ((otgp->GRSTCTL & GRSTCTL_TXFF) != 0)
;
/* Wait for 3 PHY Clocks.*/
osalSysPolledDelayX(18);
}
/**
* @brief Resets the FIFO RAM memory allocator.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
static void otg_ram_reset(USBDriver *usbp) {
usbp->pmnext = usbp->otgparams->rx_fifo_size;
}
/**
* @brief Allocates a block from the FIFO RAM memory.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] size size of the packet buffer to allocate in words
*
* @notapi
*/
static uint32_t otg_ram_alloc(USBDriver *usbp, size_t size) {
uint32_t next;
next = usbp->pmnext;
usbp->pmnext += size;
osalDbgAssert(usbp->pmnext <= usbp->otgparams->otg_ram_size,
"USBFS FIFO memory overflow");
return next;
}
/**
* @brief Writes to a TX FIFO.
*
* @param[in] fifop pointer to the FIFO register
* @param[in] buf buffer where to copy the endpoint data
* @param[in] n maximum number of bytes to copy
*
* @notapi
*/
static void otg_fifo_write_from_buffer(volatile uint32_t *fifop,
const uint8_t *buf,
size_t n) {
osalDbgAssert(n > 0, "is zero");
while (true) {
*fifop = *((uint32_t *)buf);
if (n <= 4) {
break;
}
n -= 4;
buf += 4;
}
}
/**
* @brief Reads a packet from the RXFIFO.
*
* @param[in] fifop pointer to the FIFO register
* @param[out] buf buffer where to copy the endpoint data
* @param[in] n number of bytes to pull from the FIFO
* @param[in] max number of bytes to copy into the buffer
*
* @notapi
*/
static void otg_fifo_read_to_buffer(volatile uint32_t *fifop,
uint8_t *buf,
size_t n,
size_t max) {
uint32_t w = 0;
size_t i = 0;
while (i < n) {
if ((i & 3) == 0) {
w = *fifop;
}
if (i < max) {
*buf++ = (uint8_t)w;
w >>= 8;
}
i++;
}
}
/**
* @brief Incoming packets handler.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
static void otg_rxfifo_handler(USBDriver *usbp) {
uint32_t sts, cnt, ep;
/* Popping the event word out of the RX FIFO.*/
sts = usbp->otg->GRSTATP;
/* Event details.*/
cnt = (sts & GRSTATP_BCOUNT_MASK) >> GRSTATP_BCOUNT_OFF;
ep = (sts & GRSTATP_EPNUM_MASK) >> GRSTATP_EPNUM_OFF;
switch (sts & GRSTATP_RPCKST_MASK) {
case GRSTATP_SETUP_DATA:
otg_fifo_read_to_buffer(usbp->otg->FIFO[0], usbp->epc[ep]->setup_buf,
cnt, 8);
break;
case GRSTATP_SETUP_COMP:
break;
case GRSTATP_OUT_DATA:
otg_fifo_read_to_buffer(usbp->otg->FIFO[0],
usbp->epc[ep]->out_state->rxbuf,
cnt,
usbp->epc[ep]->out_state->rxsize -
usbp->epc[ep]->out_state->rxcnt);
usbp->epc[ep]->out_state->rxbuf += cnt;
usbp->epc[ep]->out_state->rxcnt += cnt;
break;
case GRSTATP_OUT_COMP:
break;
case GRSTATP_OUT_GLOBAL_NAK:
break;
default:
break;
}
}
/**
* @brief Outgoing packets handler.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
static bool otg_txfifo_handler(USBDriver *usbp, usbep_t ep) {
/* The TXFIFO is filled until there is space and data to be transmitted.*/
while (true) {
uint32_t n;
/* Transaction end condition.*/
if (usbp->epc[ep]->in_state->txcnt >= usbp->epc[ep]->in_state->txsize) {
#if 1
usbp->otg->DIEPFEINTEN &= ~DIEPFEINTEN_IEPTXFEIE(ep);
#endif
return true;
}
/* Number of bytes remaining in current transaction.*/
n = usbp->epc[ep]->in_state->txsize - usbp->epc[ep]->in_state->txcnt;
if (n > usbp->epc[ep]->in_maxsize)
n = usbp->epc[ep]->in_maxsize;
/* Checks if in the TXFIFO there is enough space to accommodate the
next packet.*/
if (((usbp->otg->ie[ep].DIEPTFSTAT & DIEPTFSTAT_IEPTFS_MASK) * 4) < n)
return false;
// TODO Enable again or keep brute force?
/*#if GD32_USB_USBFSFIFO_FILL_BASEPRI
uint8_t threshold_old = eclic_get_mth();
eclic_set_mth(GD32_USB_USBFSFIFO_FILL_BASEPRI);
#endif*/
osalSysLockFromISR();
otg_fifo_write_from_buffer(usbp->otg->FIFO[ep],
usbp->epc[ep]->in_state->txbuf,
n);
usbp->epc[ep]->in_state->txbuf += n;
usbp->epc[ep]->in_state->txcnt += n;
osalSysUnlockFromISR();
/*#if GD32_USB_USBFSFIFO_FILL_BASEPRI
eclic_set_mth(threshold_old);
#endif*/
}
}
/**
* @brief Generic endpoint IN handler.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
static void otg_epin_handler(USBDriver *usbp, usbep_t ep) {
gd32_usbfs_t *otgp = usbp->otg;
uint32_t epint = otgp->ie[ep].DIEPINTF;
otgp->ie[ep].DIEPINTF = epint;
if (epint & DIEPINTFF_CITO) {
/* Timeouts not handled yet, not sure how to handle.*/
}
if ((epint & DIEPINTFF_TF) && (otgp->DIEPINTF & DIEPINTF_TFEN)) {
/* Transmit transfer complete.*/
USBInEndpointState *isp = usbp->epc[ep]->in_state;
if (isp->txsize < isp->totsize) {
/* In case the transaction covered only part of the total transfer
then another transaction is immediately started in order to
cover the remaining.*/
isp->txsize = isp->totsize - isp->txsize;
isp->txcnt = 0;
osalSysLockFromISR();
usb_lld_start_in(usbp, ep);
osalSysUnlockFromISR();
}
else {
/* End on IN transfer.*/
_usb_isr_invoke_in_cb(usbp, ep);
}
}
if ((epint & DIEPINTFF_TXFE) &&
(otgp->DIEPFEINTEN & DIEPFEINTEN_IEPTXFEIE(ep))) {
/* TX FIFO empty or emptying.*/
otg_txfifo_handler(usbp, ep);
}
}
/**
* @brief Generic endpoint OUT handler.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
static void otg_epout_handler(USBDriver *usbp, usbep_t ep) {
gd32_usbfs_t *otgp = usbp->otg;
uint32_t epint = otgp->oe[ep].DOEPINTF;
/* Resets all EP IRQ sources.*/
otgp->oe[ep].DOEPINTF = epint;
if ((epint & DOEPINTF_STPF) && (otgp->DOEPINTF & DOEPINTF_STPFEN)) {
/* Setup packets handling, setup packets are handled using a
specific callback.*/
_usb_isr_invoke_setup_cb(usbp, ep);
}
if ((epint & DOEPINTF_TF) && (otgp->DOEPINTF & DOEPINTF_TFEN)) {
USBOutEndpointState *osp;
/* OUT state structure pointer for this endpoint.*/
osp = usbp->epc[ep]->out_state;
/* EP0 requires special handling.*/
if (ep == 0) {
#if defined(GD32_USBFS_SEQUENCE_WORKAROUND)
/* If an OUT transaction end interrupt is processed while the state
machine is not in an OUT state then it is ignored, this is caused
on some devices (L4) apparently injecting spurious data complete
words in the RX FIFO.*/
if ((usbp->ep0state & USB_OUT_STATE) == 0)
return;
#endif
/* In case the transaction covered only part of the total transfer
then another transaction is immediately started in order to
cover the remaining.*/
if (((osp->rxcnt % usbp->epc[ep]->out_maxsize) == 0) &&
(osp->rxsize < osp->totsize)) {
osp->rxsize = osp->totsize - osp->rxsize;
osp->rxcnt = 0;
osalSysLockFromISR();
usb_lld_start_out(usbp, ep);
osalSysUnlockFromISR();
return;
}
}
/* End on OUT transfer.*/
_usb_isr_invoke_out_cb(usbp, ep);
}
}
/**
* @brief Isochronous IN transfer failed handler.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
static void otg_isoc_in_failed_handler(USBDriver *usbp) {
usbep_t ep;
gd32_usbfs_t *otgp = usbp->otg;
for (ep = 0; ep <= usbp->otgparams->num_endpoints; ep++) {
if (((otgp->ie[ep].DIEPCTL & DIEPCTL_EPTYPE_MASK) == DIEPCTL_EPTYPE_ISO) &&
((otgp->ie[ep].DIEPCTL & DIEPCTL_EPEN) != 0)) {
/* Endpoint enabled -> ISOC IN transfer failed */
/* Disable endpoint */
otgp->ie[ep].DIEPCTL |= (DIEPCTL_EPD | DIEPCTL_SNAK);
while (otgp->ie[ep].DIEPCTL & DIEPCTL_EPEN)
;
/* Flush FIFO */
otg_txfifo_flush(usbp, ep);
/* Prepare data for next frame */
_usb_isr_invoke_in_cb(usbp, ep);
/* TX FIFO empty or emptying.*/
otg_txfifo_handler(usbp, ep);
}
}
}
/**
* @brief Isochronous OUT transfer failed handler.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
static void otg_isoc_out_failed_handler(USBDriver *usbp) {
usbep_t ep;
gd32_usbfs_t *otgp = usbp->otg;
for (ep = 0; ep <= usbp->otgparams->num_endpoints; ep++) {
if (((otgp->oe[ep].DOEPCTL & DOEPCTL_EPTYPE_MASK) == DOEPCTL_EPTYPE_ISO) &&
((otgp->oe[ep].DOEPCTL & DOEPCTL_EPEN) != 0)) {
/* Endpoint enabled -> ISOC OUT transfer failed */
/* Disable endpoint */
/* CHTODO:: Core stucks here */
/*otgp->oe[ep].DOEPCTL |= (DOEPCTL_EPD | DOEPCTL_SNAK);
while (otgp->oe[ep].DOEPCTL & DOEPCTL_EPEN)
;*/
/* Prepare transfer for next frame.*/
_usb_isr_invoke_out_cb(usbp, ep);
}
}
}
/**
* @brief USBFS shared ISR.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
static void usb_lld_serve_interrupt(USBDriver *usbp) {
gd32_usbfs_t *otgp = usbp->otg;
uint32_t sts, src;
sts = otgp->GINTF;
sts &= otgp->GINTEN;
otgp->GINTF = sts;
/* Reset interrupt handling.*/
if (sts & GINTF_RST) {
/* Default reset action.*/
_usb_reset(usbp);
/* Preventing execution of more handlers, the core has been reset.*/
return;
}
/* Wake-up handling.*/
if (sts & GINTF_WKUPIF) {
/* If clocks are gated off, turn them back on (may be the case if
coming out of suspend mode).*/
if (otgp->PWRCLKCTL & (PWRCLKCTL_SUCLK | PWRCLKCTL_SHCLK)) {
/* Set to zero to un-gate the USB core clocks.*/
otgp->PWRCLKCTL &= ~(PWRCLKCTL_SUCLK | PWRCLKCTL_SHCLK);
}
/* Clear the Remote Wake-up Signaling.*/
otgp->DCTL &= ~DCTL_RWKUP;
_usb_wakeup(usbp);
}
/* Suspend handling.*/
if (sts & GINTF_SP) {
/* Stopping all ongoing transfers.*/
otg_disable_ep(usbp);
/* Default suspend action.*/
_usb_suspend(usbp);
}
/* Enumeration done.*/
if (sts & GINTF_ENUMF) {
otgp->GUSBCS = (otgp->GUSBCS & ~(GUSBCS_UTT_MASK)) |
GUSBCS_UTT(TRDT_VALUE_FS);
}
/* SOF interrupt handling.*/
if (sts & GINTF_SOF) {
_usb_isr_invoke_sof_cb(usbp);
}
/* Isochronous IN failed handling */
if (sts & GINTF_ISOINCIF) {
otg_isoc_in_failed_handler(usbp);
}
/* Isochronous OUT failed handling */
if (sts & GINTF_ISOONCIF) {
otg_isoc_out_failed_handler(usbp);
}
/* Performing the whole FIFO emptying in the ISR, it is advised to keep
this IRQ at a very low priority level.*/
if ((sts & GINTF_RXFNEIF) != 0U) {
otg_rxfifo_handler(usbp);
}
/* IN/OUT endpoints event handling.*/
src = otgp->DAEPINT;
if (sts & GINTF_OEPIF) {
if (src & (1 << 16))
otg_epout_handler(usbp, 0);
if (src & (1 << 17))
otg_epout_handler(usbp, 1);
if (src & (1 << 18))
otg_epout_handler(usbp, 2);
if (src & (1 << 19))
otg_epout_handler(usbp, 3);
}
if (sts & GINTF_IEPIF) {
if (src & (1 << 0))
otg_epin_handler(usbp, 0);
if (src & (1 << 1))
otg_epin_handler(usbp, 1);
if (src & (1 << 2))
otg_epin_handler(usbp, 2);
if (src & (1 << 3))
otg_epin_handler(usbp, 3);
}
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if GD32_USB_USE_USBFS || defined(__DOXYGEN__)
/**
* @brief USBFS interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(GD32_USBFS_HANDLER) {
OSAL_IRQ_PROLOGUE();
usb_lld_serve_interrupt(&USBD1);
OSAL_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level USB driver initialization.
*
* @notapi
*/
void usb_lld_init(void) {
/* Driver initialization.*/
usbObjectInit(&USBD1);
USBD1.otg = USBFS;
USBD1.otgparams = &fsparams;
}
/**
* @brief Configures and activates the USB peripheral.
* @note Starting the USBFS cell can be a slow operation carried out with
* interrupts disabled, perform it before starting time-critical
* operations.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_start(USBDriver *usbp) {
gd32_usbfs_t *otgp = usbp->otg;
if (usbp->state == USB_STOP) {
/* Clock activation.*/
if (&USBD1 == usbp) {
/* USBFS clock enable and reset.*/
rcuEnableUSBFS(true);
rcuResetUSBFS();
/* Enables IRQ vector.*/
eclicEnableVector(GD32_USBFS_NUMBER, GD32_USB_USBFS_IRQ_PRIORITY, GD32_USB_USBFS_IRQ_TRIGGER);
/* - Forced device mode.
- USB turn-around time = TRDT_VALUE_FS.
- Full Speed 1.1 PHY.*/
otgp->GUSBCS = GUSBCS_FDM | GUSBCS_UTT(TRDT_VALUE_FS);
/* 48MHz 1.1 PHY.*/
otgp->DCFG = 0x02200000 | DCFG_DS_FS11;
}
/* PHY enabled.*/
otgp->PWRCLKCTL = 0;
/* VBUS sensing and transceiver enabled.*/
otgp->GCCFG = GCCFG_INIT_VALUE;
/* Soft core reset.*/
otg_core_reset(usbp);
/* Interrupts on TXFIFOs half empty.*/
otgp->GAHBCS = 0;
/* Endpoints re-initialization.*/
otg_disable_ep(usbp);
/* Clear all pending Device Interrupts, only the USB Reset interrupt
is required initially.*/
otgp->DIEPINTF = 0;
otgp->DOEPINTF = 0;
otgp->DAEPINTEN = 0;
if (usbp->config->sof_cb == NULL)
otgp->GINTEN = GINTEN_ENUMFIE | GINTEN_RSTIE | GINTEN_SPIE |
GINTEN_ESPIE | GINTEN_SESIE | GINTEN_WKUPIE |
GINTEN_ISOINCIE | GINTEN_ISOONCIE;
else
otgp->GINTEN = GINTEN_ENUMFIE | GINTEN_RSTIE | GINTEN_SPIE |
GINTEN_ESPIE | GINTEN_SESIE | GINTEN_WKUPIE |
GINTEN_ISOINCIE | GINTEN_ISOONCIE |
GINTEN_SOFIE;
/* Clears all pending IRQs, if any. */
otgp->GINTF = 0xFFFFFFFF;
/* Global interrupts enable.*/
otgp->GAHBCS |= GAHBCS_GINTEN;
}
}
/**
* @brief Deactivates the USB peripheral.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_stop(USBDriver *usbp) {
gd32_usbfs_t *otgp = usbp->otg;
/* If in ready state then disables the USB clock.*/
if (usbp->state != USB_STOP) {
/* Disabling all endpoints in case the driver has been stopped while
active.*/
otg_disable_ep(usbp);
otgp->DAEPINTEN = 0;
otgp->GAHBCS = 0;
otgp->GCCFG = 0;
if (&USBD1 == usbp) {
eclicDisableVector(GD32_USBFS_NUMBER);
rcuDisableUSBFS();
}
}
}
/**
* @brief USB low level reset routine.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_reset(USBDriver *usbp) {
unsigned i;
gd32_usbfs_t *otgp = usbp->otg;
/* Flush the Tx FIFO.*/
otg_txfifo_flush(usbp, 0);
/* Endpoint interrupts all disabled and cleared.*/
otgp->DIEPFEINTEN = 0;
otgp->DAEPINTEN = DAEPINTEN_OEPIE(0) | DAEPINTEN_IEPIE(0);
/* All endpoints in NAK mode, interrupts cleared.*/
for (i = 0; i <= usbp->otgparams->num_endpoints; i++) {
otgp->ie[i].DIEPCTL = DIEPCTL_SNAK;
otgp->oe[i].DOEPCTL = DOEPCTL_SNAK;
otgp->ie[i].DIEPINTF = 0xFFFFFFFF;
otgp->oe[i].DOEPINTF = 0xFFFFFFFF;
}
/* Resets the FIFO memory allocator.*/
otg_ram_reset(usbp);
/* Receive FIFO size initialization, the address is always zero.*/
otgp->GRFLEN = usbp->otgparams->rx_fifo_size;
otg_rxfifo_flush(usbp);
/* Resets the device address to zero.*/
otgp->DCFG = (otgp->DCFG & ~DCFG_DAR_MASK) | DCFG_DAR(0);
/* Enables also EP-related interrupt sources.*/
otgp->GINTEN |= GINTEN_RXFNEIE | GINTEN_OEPIE | GINTEN_IEPIE;
otgp->DIEPINTF = DIEPINTF_CITOEN | DIEPINTF_TFEN;
otgp->DOEPINTF = DOEPINTF_STPFEN | DOEPINTF_TFEN;
/* EP0 initialization, it is a special case.*/
usbp->epc[0] = &ep0config;
otgp->oe[0].DOEPLEN = DOEPLEN_STPCNT(3);
otgp->oe[0].DOEPCTL = DOEPCTL_SD0PID | DOEPCTL_EPACT | DOEPCTL_EPTYPE_CTRL |
DOEPCTL_MPL(ep0config.out_maxsize);
otgp->ie[0].DIEPLEN = 0;
otgp->ie[0].DIEPCTL = DIEPCTL_SD0PID | DIEPCTL_EPACT | DIEPCTL_EPTYPE_CTRL |
DIEPCTL_TXFNUM(0) | DIEPCTL_MPL(ep0config.in_maxsize);
otgp->DIEPTFLEN0 = DIEPTFLEN_IEPTXFD(ep0config.in_maxsize / 4) |
DIEPTFLEN_IEPTXRSAR(otg_ram_alloc(usbp,
ep0config.in_maxsize / 4));
}
/**
* @brief Sets the USB address.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_set_address(USBDriver *usbp) {
gd32_usbfs_t *otgp = usbp->otg;
otgp->DCFG = (otgp->DCFG & ~DCFG_DAR_MASK) | DCFG_DAR(usbp->address);
}
/**
* @brief Enables an endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_init_endpoint(USBDriver *usbp, usbep_t ep) {
uint32_t ctl, fsize;
gd32_usbfs_t *otgp = usbp->otg;
/* IN and OUT common parameters.*/
switch (usbp->epc[ep]->ep_mode & USB_EP_MODE_TYPE) {
case USB_EP_MODE_TYPE_CTRL:
ctl = DIEPCTL_SD0PID | DIEPCTL_EPACT | DIEPCTL_EPTYPE_CTRL;
break;
case USB_EP_MODE_TYPE_ISOC:
ctl = DIEPCTL_SD0PID | DIEPCTL_EPACT | DIEPCTL_EPTYPE_ISO;
break;
case USB_EP_MODE_TYPE_BULK:
ctl = DIEPCTL_SD0PID | DIEPCTL_EPACT | DIEPCTL_EPTYPE_BULK;
break;
case USB_EP_MODE_TYPE_INTR:
ctl = DIEPCTL_SD0PID | DIEPCTL_EPACT | DIEPCTL_EPTYPE_INTR;
break;
default:
return;
}
/* OUT endpoint activation or deactivation.*/
otgp->oe[ep].DOEPLEN = 0;
if (usbp->epc[ep]->out_state != NULL) {
otgp->oe[ep].DOEPCTL = ctl | DOEPCTL_MPL(usbp->epc[ep]->out_maxsize);
otgp->DAEPINTEN |= DAEPINTEN_OEPIE(ep);
}
else {
otgp->oe[ep].DOEPCTL &= ~DOEPCTL_EPACT;
otgp->DAEPINTEN &= ~DAEPINTEN_OEPIE(ep);
}
/* IN endpoint activation or deactivation.*/
otgp->ie[ep].DIEPLEN = 0;
if (usbp->epc[ep]->in_state != NULL) {
/* FIFO allocation for the IN endpoint.*/
fsize = usbp->epc[ep]->in_maxsize / 4;
if (usbp->epc[ep]->in_multiplier > 1)
fsize *= usbp->epc[ep]->in_multiplier;
otgp->DIEPTFLEN[ep - 1] = DIEPTFLEN_IEPTXFD(fsize) |
DIEPTFLEN_IEPTXRSAR(otg_ram_alloc(usbp, fsize));
otg_txfifo_flush(usbp, ep);
otgp->ie[ep].DIEPCTL = ctl |
DIEPCTL_TXFNUM(ep) |
DIEPCTL_MPL(usbp->epc[ep]->in_maxsize);
otgp->DAEPINTEN |= DAEPINTEN_IEPIE(ep);
}
else {
otgp->DIEPTFLEN[ep - 1] = 0x02000400; /* Reset value.*/
otg_txfifo_flush(usbp, ep);
otgp->ie[ep].DIEPCTL &= ~DIEPCTL_EPACT;
otgp->DAEPINTEN &= ~DAEPINTEN_IEPIE(ep);
}
}
/**
* @brief Disables all the active endpoints except the endpoint zero.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_disable_endpoints(USBDriver *usbp) {
/* Resets the FIFO memory allocator.*/
otg_ram_reset(usbp);
/* Disabling all endpoints.*/
otg_disable_ep(usbp);
}
/**
* @brief Returns the status of an OUT endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @return The endpoint status.
* @retval EP_STATUS_DISABLED The endpoint is not active.
* @retval EP_STATUS_STALLED The endpoint is stalled.
* @retval EP_STATUS_ACTIVE The endpoint is active.
*
* @notapi
*/
usbepstatus_t usb_lld_get_status_out(USBDriver *usbp, usbep_t ep) {
uint32_t ctl;
(void)usbp;
ctl = usbp->otg->oe[ep].DOEPCTL;
if (!(ctl & DOEPCTL_EPACT))
return EP_STATUS_DISABLED;
if (ctl & DOEPCTL_STALL)
return EP_STATUS_STALLED;
return EP_STATUS_ACTIVE;
}
/**
* @brief Returns the status of an IN endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @return The endpoint status.
* @retval EP_STATUS_DISABLED The endpoint is not active.
* @retval EP_STATUS_STALLED The endpoint is stalled.
* @retval EP_STATUS_ACTIVE The endpoint is active.
*
* @notapi
*/
usbepstatus_t usb_lld_get_status_in(USBDriver *usbp, usbep_t ep) {
uint32_t ctl;
(void)usbp;
ctl = usbp->otg->ie[ep].DIEPCTL;
if (!(ctl & DIEPCTL_EPACT))
return EP_STATUS_DISABLED;
if (ctl & DIEPCTL_STALL)
return EP_STATUS_STALLED;
return EP_STATUS_ACTIVE;
}
/**
* @brief Reads a setup packet from the dedicated packet buffer.
* @details This function must be invoked in the context of the @p setup_cb
* callback in order to read the received setup packet.
* @pre In order to use this function the endpoint must have been
* initialized as a control endpoint.
* @post The endpoint is ready to accept another packet.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @param[out] buf buffer where to copy the packet data
*
* @notapi
*/
void usb_lld_read_setup(USBDriver *usbp, usbep_t ep, uint8_t *buf) {
memcpy(buf, usbp->epc[ep]->setup_buf, 8);
}
/**
* @brief Starts a receive operation on an OUT endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_start_out(USBDriver *usbp, usbep_t ep) {
uint32_t pcnt, rxsize;
USBOutEndpointState *osp = usbp->epc[ep]->out_state;
/* Transfer initialization.*/
osp->totsize = osp->rxsize;
if ((ep == 0) && (osp->rxsize > EP0_MAX_OUTSIZE))
osp->rxsize = EP0_MAX_OUTSIZE;
/* Transaction size is rounded to a multiple of packet size because the
following requirement in the RM:
"For OUT transfers, the transfer size field in the endpoint's transfer
size register must be a multiple of the maximum packet size of the
endpoint, adjusted to the Word boundary".*/
pcnt = (osp->rxsize + usbp->epc[ep]->out_maxsize - 1U) /
usbp->epc[ep]->out_maxsize;
rxsize = (pcnt * usbp->epc[ep]->out_maxsize + 3U) & 0xFFFFFFFCU;
/*Setting up transaction parameters in DOEPLEN.*/
usbp->otg->oe[ep].DOEPLEN = DOEPLEN_STPCNT(3) | DOEPLEN_PCNT(pcnt) |
DOEPLEN_TLEN(rxsize);
/* Special case of isochronous endpoint.*/
if ((usbp->epc[ep]->ep_mode & USB_EP_MODE_TYPE) == USB_EP_MODE_TYPE_ISOC) {
/* Odd/even bit toggling for isochronous endpoint.*/
if (usbp->otg->DSTAT & DSTAT_FNRSOF_ODD)
usbp->otg->oe[ep].DOEPCTL |= DOEPCTL_SEVENFRM;
else
usbp->otg->oe[ep].DOEPCTL |= DOEPCTL_SODDFRM;
}
/* Starting operation.*/
usbp->otg->oe[ep].DOEPCTL |= DOEPCTL_EPEN | DOEPCTL_CNAK;
}
/**
* @brief Starts a transmit operation on an IN endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_start_in(USBDriver *usbp, usbep_t ep) {
USBInEndpointState *isp = usbp->epc[ep]->in_state;
/* Transfer initialization.*/
isp->totsize = isp->txsize;
if (isp->txsize == 0) {
/* Special case, sending zero size packet.*/
usbp->otg->ie[ep].DIEPLEN = DIEPLEN_PCNT(1) | DIEPLEN_TLEN(0);
}
else {
if ((ep == 0) && (isp->txsize > EP0_MAX_INSIZE))
isp->txsize = EP0_MAX_INSIZE;
/* Normal case.*/
uint32_t pcnt = (isp->txsize + usbp->epc[ep]->in_maxsize - 1) /
usbp->epc[ep]->in_maxsize;
/* CHTODO: Support more than one packet per frame for isochronous transfers.*/
usbp->otg->ie[ep].DIEPLEN = DIEPLEN_MCPF(1) | DIEPLEN_PCNT(pcnt) |
DIEPLEN_TLEN(isp->txsize);
}
/* Special case of isochronous endpoint.*/
if ((usbp->epc[ep]->ep_mode & USB_EP_MODE_TYPE) == USB_EP_MODE_TYPE_ISOC) {
/* Odd/even bit toggling.*/
if (usbp->otg->DSTAT & DSTAT_FNRSOF_ODD)
usbp->otg->ie[ep].DIEPCTL |= DIEPCTL_SEVENFRM;
else
usbp->otg->ie[ep].DIEPCTL |= DIEPCTL_SODDFRM;
}
/* Starting operation.*/
usbp->otg->ie[ep].DIEPCTL |= DIEPCTL_EPEN | DIEPCTL_CNAK;
usbp->otg->DIEPFEINTEN |= DIEPFEINTEN_IEPTXFEIE(ep);
}
/**
* @brief Brings an OUT endpoint in the stalled state.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_stall_out(USBDriver *usbp, usbep_t ep) {
usbp->otg->oe[ep].DOEPCTL |= DOEPCTL_STALL;
}
/**
* @brief Brings an IN endpoint in the stalled state.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_stall_in(USBDriver *usbp, usbep_t ep) {
usbp->otg->ie[ep].DIEPCTL |= DIEPCTL_STALL;
}
/**
* @brief Brings an OUT endpoint in the active state.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_clear_out(USBDriver *usbp, usbep_t ep) {
usbp->otg->oe[ep].DOEPCTL &= ~DOEPCTL_STALL;
}
/**
* @brief Brings an IN endpoint in the active state.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_clear_in(USBDriver *usbp, usbep_t ep) {
usbp->otg->ie[ep].DIEPCTL &= ~DIEPCTL_STALL;
}
#endif /* HAL_USE_USB */
/** @} */
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