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- /*
- * This file is part of the libopencm3 project.
- *
- * Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
- *
- * This library is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include <string.h>
- #include <libopencm3/cm3/common.h>
- #include <libopencm3/usb/usbd.h>
- #include <libopencm3/usb/dwc/otg_common.h>
- #include "usb_private.h"
- #include "usb_dwc_common.h"
-
- /* The FS core and the HS core have the same register layout.
- * As the code can be used on both cores, the registers offset is modified
- * according to the selected cores base address. */
- #define dev_base_address (usbd_dev->driver->base_address)
- #define REBASE(x) MMIO32((x) + (dev_base_address))
-
- void dwc_set_address(usbd_device *usbd_dev, uint8_t addr)
- {
- REBASE(OTG_DCFG) = (REBASE(OTG_DCFG) & ~OTG_DCFG_DAD) | (addr << 4);
- }
-
- void dwc_ep_setup(usbd_device *usbd_dev, uint8_t addr, uint8_t type,
- uint16_t max_size,
- void (*callback) (usbd_device *usbd_dev, uint8_t ep))
- {
- /*
- * Configure endpoint address and type. Allocate FIFO memory for
- * endpoint. Install callback function.
- */
- uint8_t dir = addr & 0x80;
- addr &= 0x7f;
-
- if (addr == 0) { /* For the default control endpoint */
- /* Configure IN part. */
- if (max_size >= 64) {
- REBASE(OTG_DIEPCTL0) = OTG_DIEPCTL0_MPSIZ_64;
- } else if (max_size >= 32) {
- REBASE(OTG_DIEPCTL0) = OTG_DIEPCTL0_MPSIZ_32;
- } else if (max_size >= 16) {
- REBASE(OTG_DIEPCTL0) = OTG_DIEPCTL0_MPSIZ_16;
- } else {
- REBASE(OTG_DIEPCTL0) = OTG_DIEPCTL0_MPSIZ_8;
- }
-
- REBASE(OTG_DIEPTSIZ0) =
- (max_size & OTG_DIEPSIZ0_XFRSIZ_MASK);
- REBASE(OTG_DIEPCTL0) |=
- OTG_DIEPCTL0_EPENA | OTG_DIEPCTL0_SNAK;
-
- /* Configure OUT part. */
- usbd_dev->doeptsiz[0] = OTG_DIEPSIZ0_STUPCNT_1 |
- OTG_DIEPSIZ0_PKTCNT |
- (max_size & OTG_DIEPSIZ0_XFRSIZ_MASK);
- REBASE(OTG_DOEPTSIZ(0)) = usbd_dev->doeptsiz[0];
- REBASE(OTG_DOEPCTL(0)) |=
- OTG_DOEPCTL0_EPENA | OTG_DIEPCTL0_SNAK;
-
- REBASE(OTG_GNPTXFSIZ) = ((max_size / 4) << 16) |
- usbd_dev->driver->rx_fifo_size;
- usbd_dev->fifo_mem_top += max_size / 4;
- usbd_dev->fifo_mem_top_ep0 = usbd_dev->fifo_mem_top;
-
- return;
- }
-
- if (dir) {
- REBASE(OTG_DIEPTXF(addr)) = ((max_size / 4) << 16) |
- usbd_dev->fifo_mem_top;
- usbd_dev->fifo_mem_top += max_size / 4;
-
- REBASE(OTG_DIEPTSIZ(addr)) =
- (max_size & OTG_DIEPSIZ0_XFRSIZ_MASK);
- REBASE(OTG_DIEPCTL(addr)) |=
- OTG_DIEPCTL0_EPENA | OTG_DIEPCTL0_SNAK | (type << 18)
- | OTG_DIEPCTL0_USBAEP | OTG_DIEPCTLX_SD0PID
- | (addr << 22) | max_size;
-
- if (callback) {
- usbd_dev->user_callback_ctr[addr][USB_TRANSACTION_IN] =
- (void *)callback;
- }
- }
-
- if (!dir) {
- usbd_dev->doeptsiz[addr] = OTG_DIEPSIZ0_PKTCNT |
- (max_size & OTG_DIEPSIZ0_XFRSIZ_MASK);
- REBASE(OTG_DOEPTSIZ(addr)) = usbd_dev->doeptsiz[addr];
- REBASE(OTG_DOEPCTL(addr)) |= OTG_DOEPCTL0_EPENA |
- OTG_DOEPCTL0_USBAEP | OTG_DIEPCTL0_CNAK |
- OTG_DOEPCTLX_SD0PID | (type << 18) | max_size;
-
- if (callback) {
- usbd_dev->user_callback_ctr[addr][USB_TRANSACTION_OUT] =
- (void *)callback;
- }
- }
- }
-
- void dwc_endpoints_reset(usbd_device *usbd_dev)
- {
- int i;
- /* The core resets the endpoints automatically on reset. */
- usbd_dev->fifo_mem_top = usbd_dev->fifo_mem_top_ep0;
-
- /* Disable any currently active endpoints */
- for (i = 1; i < 4; i++) {
- if (REBASE(OTG_DOEPCTL(i)) & OTG_DOEPCTL0_EPENA) {
- REBASE(OTG_DOEPCTL(i)) |= OTG_DOEPCTL0_EPDIS;
- }
- if (REBASE(OTG_DIEPCTL(i)) & OTG_DIEPCTL0_EPENA) {
- REBASE(OTG_DIEPCTL(i)) |= OTG_DIEPCTL0_EPDIS;
- }
- }
-
- /* Flush all tx/rx fifos */
- REBASE(OTG_GRSTCTL) = OTG_GRSTCTL_TXFFLSH | OTG_GRSTCTL_TXFNUM_ALL
- | OTG_GRSTCTL_RXFFLSH;
- }
-
- void dwc_ep_stall_set(usbd_device *usbd_dev, uint8_t addr, uint8_t stall)
- {
- if (addr == 0) {
- if (stall) {
- REBASE(OTG_DIEPCTL(addr)) |= OTG_DIEPCTL0_STALL;
- } else {
- REBASE(OTG_DIEPCTL(addr)) &= ~OTG_DIEPCTL0_STALL;
- }
- }
-
- if (addr & 0x80) {
- addr &= 0x7F;
-
- if (stall) {
- REBASE(OTG_DIEPCTL(addr)) |= OTG_DIEPCTL0_STALL;
- } else {
- REBASE(OTG_DIEPCTL(addr)) &= ~OTG_DIEPCTL0_STALL;
- REBASE(OTG_DIEPCTL(addr)) |= OTG_DIEPCTLX_SD0PID;
- }
- } else {
- if (stall) {
- REBASE(OTG_DOEPCTL(addr)) |= OTG_DOEPCTL0_STALL;
- } else {
- REBASE(OTG_DOEPCTL(addr)) &= ~OTG_DOEPCTL0_STALL;
- REBASE(OTG_DOEPCTL(addr)) |= OTG_DOEPCTLX_SD0PID;
- }
- }
- }
-
- uint8_t dwc_ep_stall_get(usbd_device *usbd_dev, uint8_t addr)
- {
- /* Return non-zero if STALL set. */
- if (addr & 0x80) {
- return (REBASE(OTG_DIEPCTL(addr & 0x7f)) &
- OTG_DIEPCTL0_STALL) ? 1 : 0;
- } else {
- return (REBASE(OTG_DOEPCTL(addr)) &
- OTG_DOEPCTL0_STALL) ? 1 : 0;
- }
- }
-
- void dwc_ep_nak_set(usbd_device *usbd_dev, uint8_t addr, uint8_t nak)
- {
- /* It does not make sense to force NAK on IN endpoints. */
- if (addr & 0x80) {
- return;
- }
-
- usbd_dev->force_nak[addr] = nak;
-
- if (nak) {
- REBASE(OTG_DOEPCTL(addr)) |= OTG_DOEPCTL0_SNAK;
- } else {
- REBASE(OTG_DOEPCTL(addr)) |= OTG_DOEPCTL0_CNAK;
- }
- }
-
- uint16_t dwc_ep_write_packet(usbd_device *usbd_dev, uint8_t addr,
- const void *buf, uint16_t len)
- {
- const uint32_t *buf32 = buf;
- #if defined(__ARM_ARCH_6M__)
- const uint8_t *buf8 = buf;
- uint32_t word32;
- #endif /* defined(__ARM_ARCH_6M__) */
- int i;
-
- addr &= 0x7F;
-
- /* Return if endpoint is already enabled. */
- if (REBASE(OTG_DIEPTSIZ(addr)) & OTG_DIEPSIZ0_PKTCNT) {
- return 0;
- }
-
- /* Enable endpoint for transmission. */
- REBASE(OTG_DIEPTSIZ(addr)) = OTG_DIEPSIZ0_PKTCNT | len;
- REBASE(OTG_DIEPCTL(addr)) |= OTG_DIEPCTL0_EPENA |
- OTG_DIEPCTL0_CNAK;
-
- /* Copy buffer to endpoint FIFO, note - memcpy does not work.
- * ARMv7M supports non-word-aligned accesses, ARMv6M does not. */
- #if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
- for (i = len; i > 0; i -= 4) {
- REBASE(OTG_FIFO(addr)) = *buf32++;
- }
- #endif /* defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) */
-
- #if defined(__ARM_ARCH_6M__)
- /* Take care of word-aligned and non-word-aligned buffers */
- if (((uint32_t)buf8 & 0x3) == 0) {
- for (i = len; i > 0; i -= 4) {
- REBASE(OTG_FIFO(addr)) = *buf32++;
- }
- } else {
- for (i = len; i > 0; i -= 4) {
- memcpy(&word32, buf8, 4);
- REBASE(OTG_FIFO(addr)) = word32;
- buf8 += 4;
- }
- }
- #endif /* defined(__ARM_ARCH_6M__) */
-
- return len;
- }
-
- uint16_t dwc_ep_read_packet(usbd_device *usbd_dev, uint8_t addr,
- void *buf, uint16_t len)
- {
- int i;
- uint32_t *buf32 = buf;
- #if defined(__ARM_ARCH_6M__)
- uint8_t *buf8 = buf;
- uint32_t word32;
- #endif /* defined(__ARM_ARCH_6M__) */
- uint32_t extra;
-
- /* We do not need to know the endpoint address since there is only one
- * receive FIFO for all endpoints.
- */
- (void) addr;
- len = MIN(len, usbd_dev->rxbcnt);
-
- /* ARMv7M supports non-word-aligned accesses, ARMv6M does not. */
- #if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
- for (i = len; i >= 4; i -= 4) {
- *buf32++ = REBASE(OTG_FIFO(0));
- usbd_dev->rxbcnt -= 4;
- }
- #endif /* defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) */
-
- #if defined(__ARM_ARCH_6M__)
- /* Take care of word-aligned and non-word-aligned buffers */
- if (((uint32_t)buf8 & 0x3) == 0) {
- for (i = len; i >= 4; i -= 4) {
- *buf32++ = REBASE(OTG_FIFO(0));
- usbd_dev->rxbcnt -= 4;
- }
- } else {
- for (i = len; i >= 4; i -= 4) {
- word32 = REBASE(OTG_FIFO(0));
- memcpy(buf8, &word32, 4);
- usbd_dev->rxbcnt -= 4;
- buf8 += 4;
- }
- /* buf32 needs to be updated as it is used for extra */
- buf32 = (uint32_t *)buf8;
- }
- #endif /* defined(__ARM_ARCH_6M__) */
-
- if (i) {
- extra = REBASE(OTG_FIFO(0));
- /* we read 4 bytes from the fifo, so update rxbcnt */
- if (usbd_dev->rxbcnt < 4) {
- /* Be careful not to underflow (rxbcnt is unsigned) */
- usbd_dev->rxbcnt = 0;
- } else {
- usbd_dev->rxbcnt -= 4;
- }
- memcpy(buf32, &extra, i);
- }
-
- return len;
- }
-
- static void dwc_flush_txfifo(usbd_device *usbd_dev, int ep)
- {
- uint32_t fifo;
- /* set IN endpoint NAK */
- REBASE(OTG_DIEPCTL(ep)) |= OTG_DIEPCTL0_SNAK;
- /* wait for core to respond */
- while (!(REBASE(OTG_DIEPINT(ep)) & OTG_DIEPINTX_INEPNE)) {
- /* idle */
- }
- /* get fifo for this endpoint */
- fifo = (REBASE(OTG_DIEPCTL(ep)) & OTG_DIEPCTL0_TXFNUM_MASK) >> 22;
- /* wait for core to idle */
- while (!(REBASE(OTG_GRSTCTL) & OTG_GRSTCTL_AHBIDL)) {
- /* idle */
- }
- /* flush tx fifo */
- REBASE(OTG_GRSTCTL) = (fifo << 6) | OTG_GRSTCTL_TXFFLSH;
- /* reset packet counter */
- REBASE(OTG_DIEPTSIZ(ep)) = 0;
- while ((REBASE(OTG_GRSTCTL) & OTG_GRSTCTL_TXFFLSH)) {
- /* idle */
- }
- }
-
- void dwc_poll(usbd_device *usbd_dev)
- {
- /* Read interrupt status register. */
- uint32_t intsts = REBASE(OTG_GINTSTS);
- int i;
-
- if (intsts & OTG_GINTSTS_ENUMDNE) {
- /* Handle USB RESET condition. */
- REBASE(OTG_GINTSTS) = OTG_GINTSTS_ENUMDNE;
- usbd_dev->fifo_mem_top = usbd_dev->driver->rx_fifo_size;
- _usbd_reset(usbd_dev);
- return;
- }
-
- /*
- * There is no global interrupt flag for transmit complete.
- * The XFRC bit must be checked in each OTG_DIEPINT(x).
- */
- for (i = 0; i < 4; i++) { /* Iterate over endpoints. */
- if (REBASE(OTG_DIEPINT(i)) & OTG_DIEPINTX_XFRC) {
- /* Transfer complete. */
- if (usbd_dev->user_callback_ctr[i]
- [USB_TRANSACTION_IN]) {
- usbd_dev->user_callback_ctr[i]
- [USB_TRANSACTION_IN](usbd_dev, i);
- }
-
- REBASE(OTG_DIEPINT(i)) = OTG_DIEPINTX_XFRC;
- }
- }
-
- /* Note: RX and TX handled differently in this device. */
- if (intsts & OTG_GINTSTS_RXFLVL) {
- /* Receive FIFO non-empty. */
- uint32_t rxstsp = REBASE(OTG_GRXSTSP);
- uint32_t pktsts = rxstsp & OTG_GRXSTSP_PKTSTS_MASK;
- uint8_t ep = rxstsp & OTG_GRXSTSP_EPNUM_MASK;
-
- if (pktsts == OTG_GRXSTSP_PKTSTS_SETUP_COMP) {
- usbd_dev->user_callback_ctr[ep][USB_TRANSACTION_SETUP] (usbd_dev, ep);
- }
-
- if (pktsts == OTG_GRXSTSP_PKTSTS_OUT_COMP
- || pktsts == OTG_GRXSTSP_PKTSTS_SETUP_COMP) {
- REBASE(OTG_DOEPTSIZ(ep)) = usbd_dev->doeptsiz[ep];
- REBASE(OTG_DOEPCTL(ep)) |= OTG_DOEPCTL0_EPENA |
- (usbd_dev->force_nak[ep] ?
- OTG_DOEPCTL0_SNAK : OTG_DOEPCTL0_CNAK);
- return;
- }
-
- if ((pktsts != OTG_GRXSTSP_PKTSTS_OUT) &&
- (pktsts != OTG_GRXSTSP_PKTSTS_SETUP)) {
- return;
- }
-
- uint8_t type;
- if (pktsts == OTG_GRXSTSP_PKTSTS_SETUP) {
- type = USB_TRANSACTION_SETUP;
- } else {
- type = USB_TRANSACTION_OUT;
- }
-
- if (type == USB_TRANSACTION_SETUP
- && (REBASE(OTG_DIEPTSIZ(ep)) & OTG_DIEPSIZ0_PKTCNT)) {
- /* SETUP received but there is still something stuck
- * in the transmit fifo. Flush it.
- */
- dwc_flush_txfifo(usbd_dev, ep);
- }
-
- /* Save packet size for dwc_ep_read_packet(). */
- usbd_dev->rxbcnt = (rxstsp & OTG_GRXSTSP_BCNT_MASK) >> 4;
-
- if (type == USB_TRANSACTION_SETUP) {
- dwc_ep_read_packet(usbd_dev, ep, &usbd_dev->control_state.req, 8);
- } else if (usbd_dev->user_callback_ctr[ep][type]) {
- usbd_dev->user_callback_ctr[ep][type] (usbd_dev, ep);
- }
-
- /* Discard unread packet data. */
- for (i = 0; i < usbd_dev->rxbcnt; i += 4) {
- /* There is only one receive FIFO, so use OTG_FIFO(0) */
- (void)REBASE(OTG_FIFO(0));
- }
-
- usbd_dev->rxbcnt = 0;
- }
-
- if (intsts & OTG_GINTSTS_USBSUSP) {
- if (usbd_dev->user_callback_suspend) {
- usbd_dev->user_callback_suspend();
- }
- REBASE(OTG_GINTSTS) = OTG_GINTSTS_USBSUSP;
- }
-
- if (intsts & OTG_GINTSTS_WKUPINT) {
- if (usbd_dev->user_callback_resume) {
- usbd_dev->user_callback_resume();
- }
- REBASE(OTG_GINTSTS) = OTG_GINTSTS_WKUPINT;
- }
-
- if (intsts & OTG_GINTSTS_SOF) {
- if (usbd_dev->user_callback_sof) {
- usbd_dev->user_callback_sof();
- }
- REBASE(OTG_GINTSTS) = OTG_GINTSTS_SOF;
- }
-
- if (usbd_dev->user_callback_sof) {
- REBASE(OTG_GINTMSK) |= OTG_GINTMSK_SOFM;
- } else {
- REBASE(OTG_GINTMSK) &= ~OTG_GINTMSK_SOFM;
- }
- }
-
- void dwc_disconnect(usbd_device *usbd_dev, bool disconnected)
- {
- if (disconnected) {
- REBASE(OTG_DCTL) |= OTG_DCTL_SDIS;
- } else {
- REBASE(OTG_DCTL) &= ~OTG_DCTL_SDIS;
- }
- }
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