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nuttx/arch/arm/src/sama5/sam_udphs.c
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Gregory Nutt ac3865fd89 Updated README files and comments
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/****************************************************************************
* arch/arm/src/sama5/sam_udphs.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.orgr>
*
* References:
* SAMA5D3 Series Data Sheet
* Atmel NoOS sample code.
*
* The Atmel sample code has a BSD compatible license that requires this
* copyright notice:
*
* Copyright (c) 2009, Atmel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX, Atmel, nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include <nuttx/usb/usb.h>
#include <nuttx/usb/usbdev.h>
#include <nuttx/usb/usbdev_trace.h>
#include <arch/irq.h>
#include "up_arch.h"
#include "up_internal.h"
#include "cache.h"
#include "sam_periphclks.h"
#include "sam_memories.h"
#include "chip/sam_udphs.h"
#include "sam_udphs.h"
#if defined(CONFIG_USBDEV) && defined(CONFIG_SAMA5_UDPHS)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifndef CONFIG_USBDEV_EP0_MAXSIZE
# define CONFIG_USBDEV_EP0_MAXSIZE 64
#endif
/* Number of DMA transfer descriptors. Default: 8 */
#ifndef CONFIG_SAMA5_UDPHS_NDTDS
# define CONFIG_SAMA5_UDPHS_NDTDS 8
#endif
/* Extremely detailed register debug that you would normally never want
* enabled.
*/
#ifndef CONFIG_DEBUG
# undef CONFIG_SAMA5_UDPHS_REGDEBUG
#endif
/* Not yet supported */
#undef CONFIG_SAMA5_UDPHS_SCATTERGATHER
/* Driver Definitions *******************************************************/
/* Initial interrupt mask: Reset + Suspend + Correct Transfer */
#define SAM_CNTR_SETUP (USB_CNTR_RESETM|USB_CNTR_SUSPM|USB_CNTR_CTRM)
/* Endpoint definitions */
#define EP0 (0)
#define SAM_EPSET_ALL (0xffff) /* All endpoints */
#define SAM_EPSET_NOTEP0 (0xfffe) /* All endpoints except EP0 */
#define SAM_EPSET_DMA (0x00fe) /* All endpoints that support DMA transfers */
#define SAM_EP_BIT(ep) (1 << (ep))
#define SAM_EP0_MAXPACKET (64) /* EP0 Max. packet size */
/* DMA FIFO */
#define DMA_MAX_FIFO_SIZE (65536/1) /* Max size of the FMA FIFO */
#define EPT_VIRTUAL_SIZE 16384 /* FIFO space size in units of 32-bit words */
/* USB-related masks */
#define REQRECIPIENT_MASK (USB_REQ_TYPE_MASK | USB_REQ_RECIPIENT_MASK)
/* Endpoint register masks (handling toggle fields) */
#define EPR_NOTOG_MASK (USB_EPR_CTR_RX | USB_EPR_SETUP | USB_EPR_EPTYPE_MASK |\
USB_EPR_EP_KIND | USB_EPR_CTR_TX | USB_EPR_EA_MASK)
#define EPR_TXDTOG_MASK (USB_EPR_STATTX_MASK | EPR_NOTOG_MASK)
#define EPR_RXDTOG_MASK (USB_EPR_STATRX_MASK | EPR_NOTOG_MASK)
/* Request queue operations *************************************************/
#define sam_rqempty(q) ((q)->head == NULL)
#define sam_rqpeek(q) ((q)->head)
/* USB trace ****************************************************************/
/* Trace error codes */
#define SAM_TRACEERR_ALLOCFAIL 0x0001
#define SAM_TRACEERR_BADCLEARFEATURE 0x0002
#define SAM_TRACEERR_BADDEVGETSTATUS 0x0003
#define SAM_TRACEERR_BADEPGETSTATUS 0x0004
#define SAM_TRACEERR_BADEOBSTATE 0x0005
#define SAM_TRACEERR_BADEPNO 0x0006
#define SAM_TRACEERR_BADEPTYPE 0x0007
#define SAM_TRACEERR_BADGETCONFIG 0x0008
#define SAM_TRACEERR_BADGETSETDESC 0x0009
#define SAM_TRACEERR_BADGETSTATUS 0x000a
#define SAM_TRACEERR_BADSETADDRESS 0x000b
#define SAM_TRACEERR_BADSETCONFIG 0x000c
#define SAM_TRACEERR_BADSETFEATURE 0x000d
#define SAM_TRACEERR_BINDFAILED 0x000e
#define SAM_TRACEERR_DISPATCHSTALL 0x000f
#define SAM_TRACEERR_DMAERR 0x0010
#define SAM_TRACEERR_DRIVER 0x0011
#define SAM_TRACEERR_DRIVERREGISTERED 0x0012
#define SAM_TRACEERR_ENDBUFST 0x0013
#define SAM_TRACEERR_EP0SETUPOUTSIZE 0x0014
#define SAM_TRACEERR_EP0SETUPSTALLED 0x0015
#define SAM_TRACEERR_EPOUTNULLPACKET 0x0016
#define SAM_TRACEERR_EPRESERVE 0x0017
#define SAM_TRACEERR_EPTCFGMAPD 0x0018
#define SAM_TRACEERR_INVALIDCTRLREQ 0x0019
#define SAM_TRACEERR_INVALIDPARMS 0x001a
#define SAM_TRACEERR_IRQREGISTRATION 0x001b
#define SAM_TRACEERR_NOTCONFIGURED 0x001c
#define SAM_TRACEERR_REQABORTED 0x001d
#define SAM_TRACEERR_TXRDYERR 0x001e
/* Trace interrupt codes */
#define SAM_TRACEINTID_ADDRESSED 0x0001
#define SAM_TRACEINTID_CLEARFEATURE 0x0002
#define SAM_TRACEINTID_DETSUSPD 0x0003
#define SAM_TRACEINTID_DEVGETSTATUS 0x0004
#define SAM_TRACEINTID_DISPATCH 0x0005
#define SAM_TRACEINTID_DMA 0x0006
#define SAM_TRACEINTID_DMAEOB 0x0007
#define SAM_TRACEINTID_DMAEOC 0x0008
#define SAM_TRACEINTID_ENDRESET 0x0009
#define SAM_TRACEINTID_EP 0x0001
#define SAM_TRACEINTID_EP0SETUPIN 0x000b
#define SAM_TRACEINTID_EP0SETUPOUT 0x000c
#define SAM_TRACEINTID_EP0SETUPSETADDRESS 0x000d
#define SAM_TRACEINTID_EPGETSTATUS 0x000e
#define SAM_TRACEINTID_EPINQEMPTY 0x000f
#define SAM_TRACEINTID_EPOUTQEMPTY 0x0010
#define SAM_TRACEINTID_GETCONFIG 0x0011
#define SAM_TRACEINTID_GETSETDESC 0x0012
#define SAM_TRACEINTID_GETSETIF 0x0013
#define SAM_TRACEINTID_GETSTATUS 0x0014
#define SAM_TRACEINTID_IFGETSTATUS 0x0015
#define SAM_TRACEINTID_INTERRUPT 0x0016
#define SAM_TRACEINTID_INTSOF 0x0017
#define SAM_TRACEINTID_NOSTDREQ 0x0018
#define SAM_TRACEINTID_PENDING 0x0019
#define SAM_TRACEINTID_RXRDY 0x001a
#define SAM_TRACEINTID_RXSETUP 0x001b
#define SAM_TRACEINTID_SETCONFIG 0x001c
#define SAM_TRACEINTID_SETFEATURE 0x001d
#define SAM_TRACEINTID_STALLSNT 0x001e
#define SAM_TRACEINTID_SYNCHFRAME 0x001f
#define SAM_TRACEINTID_TXRDY 0x0020
#define SAM_TRACEINTID_UPSTRRES 0x0021
#define SAM_TRACEINTID_WAKEUP 0x0022
/* Ever-present MIN and MAX macros */
#ifndef MIN
# define MIN(a,b) (a < b ? a : b)
#endif
#ifndef MAX
# define MAX(a,b) (a > b ? a : b)
#endif
/* Byte ordering in host-based values */
#ifdef CONFIG_ENDIAN_BIG
# define LSB 1
# define MSB 0
#else
# define LSB 0
# define MSB 1
#endif
/****************************************************************************
* Private Type Definitions
****************************************************************************/
/* State of an endpoint */
enum sam_epstate_e
{
/* --- All Endpoints --- */
UDPHS_EPSTATE_DISABLED = 0, /* Endpoint is disabled */
UDPHS_EPSTATE_STALLED, /* Endpoint is stalled */
UDPHS_EPSTATE_IDLE, /* Endpoint is idle (i.e. ready for transmission) */
UDPHS_EPSTATE_SENDING, /* Endpoint is sending data */
UDPHS_EPSTATE_RECEIVING, /* Endpoint is receiving data */
/* --- Endpoint 0 Only --- */
UDPHS_EPSTATE_EP0DATAOUT, /* Endpoint 0 is receiving SETUP OUT data */
UDPHS_EPSTATE_EP0STATUSIN, /* Endpoint 0 is sending SETUP status */
UDPHS_EPSTATE_EP0ADDRESS /* Address change is pending completion of status */
};
/* The overall state of the device */
enum sam_devstate_e
{
UDPHS_DEVSTATE_SUSPENDED = 0, /* The device is currently suspended */
UDPHS_DEVSTATE_POWERED, /* Host is providing +5V through the USB cable */
UDPHS_DEVSTATE_DEFAULT, /* Device has been reset */
UDPHS_DEVSTATE_ADDRESSED, /* The device has been given an address on the bus */
UDPHS_DEVSTATE_CONFIGURED /* A valid configuration has been selected. */
};
/* The result of EP0 SETUP processing */
enum sam_ep0setup_e
{
UDPHS_EP0SETUP_SUCCESS = 0, /* The SETUP was handle without incident */
UDPHS_EP0SETUP_DISPATCHED, /* The SETUP was forwarded to the class driver */
UDPHS_EP0SETUP_ADDRESS, /* A new device address is pending */
UDPHS_EP0SETUP_STALL /* An error occurred */
};
/* DMA transfer descriptor */
#ifdef CONFIG_SAMA5_UDPHS_SCATTERGATHER
struct sam_dtd_s
{
struct udphs_dtd_s hw; /* These are the fields as seen by the hardware */
uint32_t pad; /* Pad to 16 bytes to support arrays of descriptors */
};
#define SIZEOF_SAM_DTD_S 16
#endif
/* The following is used to manage lists of free DMA transfer descriptors */
struct sam_list_s
{
struct sam_list_s *flink; /* Link to next entry in the list */
/* Variable length entry data follows */
};
union wb_u
{
uint16_t w;
uint8_t b[2];
};
/* A container for a request so that the request make be retained in a list */
struct sam_req_s
{
struct usbdev_req_s req; /* Standard USB request */
struct sam_req_s *flink; /* Supports a singly linked list */
uint16_t inflight; /* Number of TX bytes written to FIFO */
};
/* The head of a queue of requests */
struct sam_rqhead_s
{
struct sam_req_s *head; /* Requests are added to the head of the list */
struct sam_req_s *tail; /* Requests are removed from the tail of the list */
};
/* This is the internal representation of an endpoint */
struct sam_ep_s
{
/* Common endpoint fields. This must be the first thing defined in the
* structure so that it is possible to simply cast from struct usbdev_ep_s
* to struct sam_ep_s.
*/
struct usbdev_ep_s ep; /* Standard endpoint structure */
/* SAMA5-specific fields */
struct sam_usbdev_s *dev; /* Reference to private driver data */
struct sam_rqhead_s reqq; /* Read/write request queue */
#ifdef CONFIG_SAMA5_UDPHS_SCATTERGATHER
struct sam_dtd_s *dtdll; /* Head of the DMA transfer descriptor list */
#endif
volatile uint8_t epstate; /* State of the endpoint (see enum sam_epstate_e) */
volatile uint8_t bank; /* Current reception bank (0 or 1) */
uint8_t stalled:1; /* true: Endpoint is stalled */
uint8_t halted:1; /* true: Endpoint feature halted */
uint8_t zlpneeded:1; /* Zero length packet needed at end of transfer */
uint8_t zlpsent:1; /* Zero length packet has been sent */
};
struct sam_usbdev_s
{
/* Common device fields. This must be the first thing defined in the
* structure so that it is possible to simply cast from struct usbdev_s
* to structsam_usbdev_s.
*/
struct usbdev_s usbdev;
/* The bound device class driver */
struct usbdevclass_driver_s *driver;
/* UDPHS-specific fields */
struct usb_ctrlreq_s ctrl; /* Last EP0 request */
uint8_t devstate; /* State of the device (see enum sam_devstate_e) */
uint8_t prevstate; /* Previous state of the device before SUSPEND */
uint8_t devaddr; /* Assigned device address */
uint8_t selfpowered:1; /* 1: Device is self powered */
uint16_t epavail; /* Bitset of available endpoints */
/* DMA Transfer descriptors */
#ifdef CONFIG_SAMA5_UDPHS_SCATTERGATHER
struct sam_dtd_s *tdfree; /* A list of free transfer descriptors */
#ifndef CONFIG_SAMA5_UDPHS_PREALLOCATE
struct sam_dtd_s *tdpool; /* Pool of allocated DMA transfer descriptors */
#endif
#endif
/* The endpoint list */
struct sam_ep_s eplist[SAM_UDPHS_NENDPOINTS];
/* EP0 data buffer. For data that is included in an EP0 SETUP OUT
* transaction. In this case, no request is in place from the class
* driver and the incoming data is caught in this buffer. The size
* of valid dat in the buffer is given by ctrlreg.len[]. For the
* case of EP0 SETUP IN transaction, the normal request mechanism is
* used and the class driver provides the buffering.
*/
uint8_t ep0out[SAM_EP0_MAXPACKET];
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Register operations ******************************************************/
#ifdef CONFIG_SAMA5_UDPHS_REGDEBUG
static void sam_printreg(uintptr_t regaddr, uint32_t regval, bool iswrite);
static void sam_checkreg(uintptr_t regaddr, uint32_t regval, bool iswrite);
static uint32_t sam_getreg(uintptr_t regaddr);
static void sam_putreg(uint32_t regval, uintptr_t regaddr);
static void sam_dumpep(struct sam_usbdev_s *priv, int epno);
#else
static inline uint32_t sam_getreg(uintptr_t regaddr);
static inline void sam_putreg(uint32_t regval, uintptr_t regaddr);
# define sam_dumpep(priv,epno)
#endif
/* Suspend/Resume Helpers ***************************************************/
static void sam_suspend(struct sam_usbdev_s *priv);
static void sam_resume(struct sam_usbdev_s *priv);
/* DMA Transfer Helpers *****************************************************/
#ifdef CONFIG_SAMA5_UDPHS_SCATTERGATHER
static struct sam_dtd_s *sam_dtd_alloc(struct sam_usbdev_s *priv);
static void sam_dtd_free(struct sam_usbdev_s *priv, struct sam_dtd_s *dtd);
#endif
static void sam_dma_single(uint8_t epno, struct sam_req_s *privreq,
uint32_t dmacontrol);
static void sam_dma_wrsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, struct sam_req_s *privreq);
static void sam_dma_rdsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, struct sam_req_s *privreq);
/* Request Helpers **********************************************************/
static struct sam_req_s *
sam_req_dequeue(struct sam_rqhead_s *queue);
static void sam_req_enqueue(struct sam_rqhead_s *queue,
struct sam_req_s *req);
static inline void
sam_req_abort(struct sam_ep_s *privep,
struct sam_req_s *privreq, int16_t result);
static void sam_req_complete(struct sam_ep_s *privep, int16_t result);
static void sam_ep_txrdy(unsigned int epno);
static void sam_req_wrsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, struct sam_req_s *privreq);
static int sam_req_write(struct sam_usbdev_s *priv,
struct sam_ep_s *privep);
static void sam_req_rddone(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, struct sam_req_s *privreq,
uint16_t recvsize);
static void sam_req_rdenable(uint8_t epno);
static void sam_req_rddisable(uint8_t epno);
static int sam_req_read(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, uint16_t recvsize);
static void sam_req_cancel(struct sam_ep_s *privep, int16_t status);
/* Interrupt level processing ***********************************************/
static void sam_ep0_read(uint8_t *buffer, size_t buflen);
static void sam_ep0_wrstatus(const uint8_t *buffer, size_t buflen);
static void sam_ep0_dispatch(struct sam_usbdev_s *priv);
static void sam_setdevaddr(struct sam_usbdev_s *priv, uint8_t value);
static void sam_ep0_setup(struct sam_usbdev_s *priv);
static void sam_dma_interrupt(struct sam_usbdev_s *priv, int chan);
static void sam_ep_interrupt(struct sam_usbdev_s *priv, int epno);
static int sam_udphs_interrupt(int irq, void *context);
/* Endpoint helpers *********************************************************/
static void sam_ep_reset(struct sam_usbdev_s *priv, uint8_t epno);
static void sam_epset_reset(struct sam_usbdev_s *priv, uint16_t epset);
static inline struct sam_ep_s *
sam_ep_reserve(struct sam_usbdev_s *priv, uint8_t epset);
static inline void
sam_ep_unreserve(struct sam_usbdev_s *priv,
struct sam_ep_s *privep);
static inline bool
sam_ep_reserved(struct sam_usbdev_s *priv, int epno);
static int sam_ep_configure_internal(struct sam_ep_s *privep,
const struct usb_epdesc_s *desc);
/* Endpoint operations ******************************************************/
static int sam_ep_configure(struct usbdev_ep_s *ep,
const struct usb_epdesc_s *desc, bool last);
static int sam_ep_disable(struct usbdev_ep_s *ep);
static struct usbdev_req_s *
sam_ep_allocreq(struct usbdev_ep_s *ep);
static void sam_ep_freereq(struct usbdev_ep_s *ep,
struct usbdev_req_s *);
#ifdef CONFIG_USBDEV_DMA
static void *sam_ep_allocbuffer(struct usbdev_ep_s *ep, uint16_t nbytes);
static void sam_ep_freebuffer(struct usbdev_ep_s *ep, void *buf);
#endif
static int sam_ep_submit(struct usbdev_ep_s *ep,
struct usbdev_req_s *req);
static int sam_ep_cancel(struct usbdev_ep_s *ep,
struct usbdev_req_s *req);
static int sam_ep_stall(struct usbdev_ep_s *ep, bool resume);
/* USB device controller operations *****************************************/
static struct usbdev_ep_s *
sam_allocep(struct usbdev_s *dev, uint8_t epno, bool in,
uint8_t eptype);
static void sam_freeep(struct usbdev_s *dev, struct usbdev_ep_s *ep);
static int sam_getframe(struct usbdev_s *dev);
static int sam_wakeup(struct usbdev_s *dev);
static int sam_selfpowered(struct usbdev_s *dev, bool selfpowered);
static int sam_pullup(FAR struct usbdev_s *dev, bool enable);
/* Initialization/Reset *****************************************************/
static void sam_reset(struct sam_usbdev_s *priv);
static void sam_hw_setup(struct sam_usbdev_s *priv);
static void sam_sw_setup(struct sam_usbdev_s *priv);
static void sam_hw_shutdown(struct sam_usbdev_s *priv);
static void sam_sw_shutdown(struct sam_usbdev_s *priv);
/****************************************************************************
* Private Data
****************************************************************************/
/* Since there is only a single USB interface, all status information can be
* be simply retained in a single global instance.
*/
static struct sam_usbdev_s g_udphs;
static const struct usbdev_epops_s g_epops =
{
.configure = sam_ep_configure,
.disable = sam_ep_disable,
.allocreq = sam_ep_allocreq,
.freereq = sam_ep_freereq,
#ifdef CONFIG_USBDEV_DMA
.allocbuffer = sam_ep_allocbuffer,
.freebuffer = sam_ep_freebuffer,
#endif
.submit = sam_ep_submit,
.cancel = sam_ep_cancel,
.stall = sam_ep_stall,
};
static const struct usbdev_ops_s g_devops =
{
.allocep = sam_allocep,
.freeep = sam_freeep,
.getframe = sam_getframe,
.wakeup = sam_wakeup,
.selfpowered = sam_selfpowered,
.pullup = sam_pullup,
};
/* This describes endpoint 0 */
static const struct usb_epdesc_s g_ep0desc =
{
.len = USB_SIZEOF_EPDESC,
.type = USB_DESC_TYPE_ENDPOINT,
.addr = EP0,
.attr = USB_EP_ATTR_XFER_CONTROL,
.mxpacketsize = {64, 0},
.interval = 0
};
#ifdef CONFIG_SAMA5_UDPHS_SCATTERGATHER
#ifdef CONFIG_SAMA5_UDPHS_PREALLOCATE
/* This is a properly aligned pool of preallocated DMA transfer desciptors */
static struct sam_dtd_s g_dtdpool[CONFIG_SAMA5_UDPHS_NDTDS]
__attribute__ ((aligned(16)));
#endif
#endif
/* Device error strings that may be enabled for more desciptive USB trace
* output.
*/
#ifdef CONFIG_USBDEV_TRACE_STRINGS
const struct trace_msg_t g_usb_trace_strings_deverror[] =
{
TRACE_STR(SAM_TRACEERR_ALLOCFAIL),
TRACE_STR(SAM_TRACEERR_BADCLEARFEATURE),
TRACE_STR(SAM_TRACEERR_BADDEVGETSTATUS),
TRACE_STR(SAM_TRACEERR_BADEPGETSTATUS),
TRACE_STR(SAM_TRACEERR_BADEOBSTATE),
TRACE_STR(SAM_TRACEERR_BADEPNO),
TRACE_STR(SAM_TRACEERR_BADEPTYPE),
TRACE_STR(SAM_TRACEERR_BADGETCONFIG),
TRACE_STR(SAM_TRACEERR_BADGETSETDESC),
TRACE_STR(SAM_TRACEERR_BADGETSTATUS),
TRACE_STR(SAM_TRACEERR_BADSETADDRESS),
TRACE_STR(SAM_TRACEERR_BADSETCONFIG),
TRACE_STR(SAM_TRACEERR_BADSETFEATURE),
TRACE_STR(SAM_TRACEERR_BINDFAILED),
TRACE_STR(SAM_TRACEERR_DISPATCHSTALL),
TRACE_STR(SAM_TRACEERR_DMAERR),
TRACE_STR(SAM_TRACEERR_DRIVER),
TRACE_STR(SAM_TRACEERR_DRIVERREGISTERED),
TRACE_STR(SAM_TRACEERR_ENDBUFST),
TRACE_STR(SAM_TRACEERR_EP0SETUPOUTSIZE),
TRACE_STR(SAM_TRACEERR_EP0SETUPSTALLED),
TRACE_STR(SAM_TRACEERR_EPOUTNULLPACKET),
TRACE_STR(SAM_TRACEERR_EPRESERVE),
TRACE_STR(SAM_TRACEERR_EPTCFGMAPD),
TRACE_STR(SAM_TRACEERR_INVALIDCTRLREQ),
TRACE_STR(SAM_TRACEERR_INVALIDPARMS),
TRACE_STR(SAM_TRACEERR_IRQREGISTRATION),
TRACE_STR(SAM_TRACEERR_NOTCONFIGURED),
TRACE_STR(SAM_TRACEERR_REQABORTED),
TRACE_STR(SAM_TRACEERR_TXRDYERR),
TRACE_STR_END
};
#endif
/* Interrupt event strings that may be enabled for more desciptive USB trace
* output.
*/
#ifdef CONFIG_USBDEV_TRACE_STRINGS
const struct trace_msg_t g_usb_trace_strings_intdecode[] =
{
TRACE_STR(SAM_TRACEINTID_ADDRESSED),
TRACE_STR(SAM_TRACEINTID_CLEARFEATURE),
TRACE_STR(SAM_TRACEINTID_DETSUSPD),
TRACE_STR(SAM_TRACEINTID_DEVGETSTATUS),
TRACE_STR(SAM_TRACEINTID_DISPATCH),
TRACE_STR(SAM_TRACEINTID_DMA),
TRACE_STR(SAM_TRACEINTID_DMAEOB),
TRACE_STR(SAM_TRACEINTID_DMAEOC),
TRACE_STR(SAM_TRACEINTID_ENDRESET),
TRACE_STR(SAM_TRACEINTID_EP),
TRACE_STR(SAM_TRACEINTID_EP0SETUPIN),
TRACE_STR(SAM_TRACEINTID_EP0SETUPOUT),
TRACE_STR(SAM_TRACEINTID_EP0SETUPSETADDRESS),
TRACE_STR(SAM_TRACEINTID_EPGETSTATUS),
TRACE_STR(SAM_TRACEINTID_EPINQEMPTY),
TRACE_STR(SAM_TRACEINTID_EPOUTQEMPTY),
TRACE_STR(SAM_TRACEINTID_GETCONFIG),
TRACE_STR(SAM_TRACEINTID_GETSETDESC),
TRACE_STR(SAM_TRACEINTID_GETSETIF),
TRACE_STR(SAM_TRACEINTID_GETSTATUS),
TRACE_STR(SAM_TRACEINTID_IFGETSTATUS),
TRACE_STR(SAM_TRACEINTID_INTERRUPT),
TRACE_STR(SAM_TRACEINTID_INTSOF),
TRACE_STR(SAM_TRACEINTID_NOSTDREQ),
TRACE_STR(SAM_TRACEINTID_PENDING),
TRACE_STR(SAM_TRACEINTID_RXRDY),
TRACE_STR(SAM_TRACEINTID_RXSETUP),
TRACE_STR(SAM_TRACEINTID_SETCONFIG),
TRACE_STR(SAM_TRACEINTID_SETFEATURE),
TRACE_STR(SAM_TRACEINTID_STALLSNT),
TRACE_STR(SAM_TRACEINTID_SYNCHFRAME),
TRACE_STR(SAM_TRACEINTID_TXRDY),
TRACE_STR(SAM_TRACEINTID_UPSTRRES),
TRACE_STR(SAM_TRACEINTID_WAKEUP),
TRACE_STR_END
};
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Private Functions
****************************************************************************/
/****************************************************************************
* Register Operations
****************************************************************************/
/*******************************************************************************
* Name: sam_printreg
*
* Description:
* Print the contents of a SAMA5 EHCI register
*
*******************************************************************************/
#ifdef CONFIG_SAMA5_UDPHS_REGDEBUG
static void sam_printreg(uintptr_t regaddr, uint32_t regval, bool iswrite)
{
lldbg("%p%s%08x\n", regaddr, iswrite ? "<-" : "->", regval);
}
#endif
/*******************************************************************************
* Name: sam_checkreg
*
* Description:
* Check if it is time to output debug information for accesses to a SAMA5
* EHCI register
*
*******************************************************************************/
#ifdef CONFIG_SAMA5_UDPHS_REGDEBUG
static void sam_checkreg(uintptr_t regaddr, uint32_t regval, bool iswrite)
{
static uintptr_t prevaddr = 0;
static uint32_t preval = 0;
static uint32_t count = 0;
static bool prevwrite = false;
/* Is this the same value that we read from/wrote to the same register last time?
* Are we polling the register? If so, suppress the output.
*/
if (regaddr == prevaddr && regval == preval && prevwrite == iswrite)
{
/* Yes.. Just increment the count */
count++;
}
else
{
/* No this is a new address or value or operation. Were there any
* duplicate accesses before this one?
*/
if (count > 0)
{
/* Yes.. Just one? */
if (count == 1)
{
/* Yes.. Just one */
sam_printreg(prevaddr, preval, prevwrite);
}
else
{
/* No.. More than one. */
lldbg("[repeats %d more times]\n", count);
}
}
/* Save the new address, value, count, and operation for next time */
prevaddr = regaddr;
preval = regval;
count = 0;
prevwrite = iswrite;
/* Show the new register access */
sam_printreg(regaddr, regval, iswrite);
}
}
#endif
/*******************************************************************************
* Name: sam_getreg
*
* Description:
* Get the contents of an SAMA5 register
*
*******************************************************************************/
#ifdef CONFIG_SAMA5_UDPHS_REGDEBUG
static uint32_t sam_getreg(uintptr_t regaddr)
{
/* Read the value from the register */
uint32_t regval = getreg32(regaddr);
/* Check if we need to print this value */
sam_checkreg(regaddr, regval, false);
return regval;
}
#else
static inline uint32_t sam_getreg(uintptr_t regaddr)
{
return getreg32(regaddr);
}
#endif
/*******************************************************************************
* Name: sam_putreg
*
* Description:
* Set the contents of an SAMA5 register to a value
*
*******************************************************************************/
#ifdef CONFIG_SAMA5_UDPHS_REGDEBUG
static void sam_putreg(uint32_t regval, uintptr_t regaddr)
{
/* Check if we need to print this value */
sam_checkreg(regaddr, regval, true);
/* Write the value */
putreg32(regval, regaddr);
}
#else
static inline void sam_putreg(uint32_t regval, uint32_t regaddr)
{
putreg32(regval, regaddr);
}
#endif
/****************************************************************************
* Name: sam_dumpep
****************************************************************************/
#if defined(CONFIG_SAMA5_UDPHS_REGDEBUG) && defined(CONFIG_DEBUG)
static void sam_dumpep(struct sam_usbdev_s *priv, int epno)
{
/* Global Registers */
lldbg("Global Register:\n");
lldbg(" CTRL: %04x\n", sam_getreg(SAM_UDPHS_CTRL));
lldbg(" FNUM: %04x\n", sam_getreg(SAM_UDPHS_FNUM));
lldbg(" IEN: %04x\n", sam_getreg(SAM_UDPHS_IEN));
lldbg(" INSTA: %04x\n", sam_getreg(SAM_UDPHS_INTSTA));
lldbg(" TST: %04x\n", sam_getreg(SAM_UDPHS_TST));
/* Endpoint registers */
lldbg("Endpoint %d Register:\n", epno);
lldbg(" CFG: %04x\n", sam_getreg(SAM_UDPHS_EPTCFG(epno)));
lldbg(" CTL: %04x\n", sam_getreg(SAM_UDPHS_EPTCTL(epno)));
lldbg(" STA: %04x\n", sam_getreg(SAM_UDPHS_EPTSTA(epno)));
lldbg("DMA %d Register:\n", epno);
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0)
{
lldbg(" NXTDSC: %04x\n", sam_getreg(SAM_UDPHS_DMANXTDSC(epno)));
lldbg(" ADDRESS: %04x\n", sam_getreg(SAM_UDPHS_DMAADDRESS(epno)));
lldbg(" CONTROL: %04x\n", sam_getreg(SAM_UDPHS_DMACONTROL(epno)));
lldbg(" STATUS: %04x\n", sam_getreg(SAM_UDPHS_DMASTATUS(epno)));
}
else
{
lldbg(" None\n");
}
}
#endif
/****************************************************************************
* DMA
****************************************************************************/
/****************************************************************************
* Name: sam_dtd_alloc
*
* Description:
* Allocate a DMA transfer descriptor by removing it from the free list
*
* Assumption: Caller holds the exclsem
*
****************************************************************************/
#ifdef CONFIG_SAMA5_UDPHS_SCATTERGATHER
static struct sam_dtd_s *sam_dtd_alloc(struct sam_usbdev_s *priv)
{
struct sam_dtd_s *dtd;
/* Remove the DMA transfer descriptor from the freelist */
dtd = (struct sam_dtd_s *)g_udphs.dtdfree;
if (dtd)
{
g_udphs.dtdfree = ((struct sam_list_s *)dtd)->flink;
memset(dtd, 0, sizeof(struct sam_dtd_s));
}
return dtd;
}
#endif
/****************************************************************************
* Name: sam_dtd_free
*
* Description:
* Free a DMA transfer descriptor by returning it to the free list
*
* Assumption: Caller holds the exclsem
*
****************************************************************************/
#ifdef CONFIG_SAMA5_UDPHS_SCATTERGATHER
static void sam_dtd_free(struct sam_usbdev_s *priv, struct sam_dtd_s *dtd)
{
struct sam_list_s *entry = (struct sam_list_s *)dtd;
/* Put the dtd structure back into the free list */
entry->flink = g_udphs.dtdfree;
g_udphs.dtdfree = entry;
}
#endif
/****************************************************************************
* Name: sam_dma_single
*
* Description:
* Setup a start a single buffer DMA.
*
* Assumption: Called as part of UDPHS interrupt handling
*
****************************************************************************/
static void sam_dma_single(uint8_t epno, struct sam_req_s *privreq,
uint32_t dmacontrol)
{
uintptr_t buffer;
uintptr_t physaddr;
uint32_t regval;
/* Not all endpoints support DMA */
DEBUGASSERT((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0);
/* Flush the contents of the DMA buffer to RAM */
buffer = (uintptr_t)&privreq->req.buf[privreq->req.xfrd];
cp15_clean_dcache(buffer, buffer + privreq->inflight);
/* Set up the DMA */
physaddr = sam_physramaddr(buffer);
sam_putreg(physaddr, SAM_UDPHS_DMAADDRESS(epno));
/* Clear any pending interrupts then enable the DMA interrupt */
(void)sam_getreg(SAM_UDPHS_DMASTATUS(epno));
regval = sam_getreg(SAM_UDPHS_IEN);
regval |= UDPHS_INT_DMA(epno);
sam_putreg(regval, SAM_UDPHS_IEN);
/* Setup and enable the DMA */
sam_putreg(0, SAM_UDPHS_DMACONTROL(epno));
dmacontrol |= UDPHS_DMACONTROL_BUFLEN(privreq->inflight);
sam_putreg(dmacontrol, SAM_UDPHS_DMACONTROL(epno));
}
/****************************************************************************
* Name: sam_dma_wrsetup
*
* Description:
* Process the next queued write request for an endpoint that supports DMA.
*
****************************************************************************/
static void sam_dma_wrsetup(struct sam_usbdev_s *priv, struct sam_ep_s *privep,
struct sam_req_s *privreq)
{
uint32_t regval;
int remaining;
int epno;
/* Switch to the sending state */
privep->epstate = UDPHS_EPSTATE_SENDING;
privreq->inflight = 0;
/* Get the endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* How many bytes remain to be transferred in the request? */
remaining = (int)privreq->req.len - (int)privreq->req.xfrd;
DEBUGASSERT(remaining >= 0 && remaining <= (int)privreq->req.len);
/* If there are no bytes to send, then send a zero length packet */
if (remaining > 0)
{
/* Clip the transfer to the size of the DMA FIFO */
#if USBDEV_MAXREQUEUST > DMA_MAX_FIFO_SIZE
if (remaining > DMA_MAX_FIFO_SIZE)
{
privreq->inflight = DMA_MAX_FIFO_SIZE;
}
else
#endif
{
privreq->inflight = remaining;
}
/* And perform the single DMA transfer.
*
* 32.6.10.6 Bulk IN or Interrupt IN: Sending a Buffer Using DMA
* - END_B_EN: The endpoint can validate the packet (according to the
* values programmed in the AUTO_VALID and SHRT_PCKT fields of
* UDPHS_EPTCTLx.) ...
* - END_BUFFIT: generate an interrupt when the BUFF_COUNT in
* UDPHS_DMASTATUSx reaches 0.
* - CHANN_ENB: Run and stop at end of buffer
*/
sam_dma_single(epno, privreq,
UDPHS_DMACONTROL_ENDBEN | UDPHS_DMACONTROL_ENDBUFFIT |
UDPHS_DMACONTROL_CHANNENB);
}
/* Enable the endpoint interrupt */
regval = sam_getreg(SAM_UDPHS_IEN);
regval |= UDPHS_INT_EPT(epno);
sam_putreg(regval, SAM_UDPHS_IEN);
}
/****************************************************************************
* Name: sam_dma_rdsetup
*
* Description:
* Process the next queued read request for an endpoint that supports DMA.
*
****************************************************************************/
static void sam_dma_rdsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep,
struct sam_req_s *privreq)
{
uint32_t regval;
int remaining;
int epno;
/* Get the endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* How many more bytes can we append to the request buffer? */
remaining = (int)privreq->req.len - (int)privreq->req.xfrd;
DEBUGASSERT(remaining > 0 && remaining <= (int)privreq->req.len &&
privep->epstate == UDPHS_EPSTATE_RECEIVING);
/* Clip the DMA transfer size to the size available in the user buffer */
#if USBDEV_MAXREQUEUST > DMA_MAX_FIFO_SIZE
if (remaining > DMA_MAX_FIFO_SIZE)
{
privreq->inflight = DMA_MAX_FIFO_SIZE;
}
else
#endif
{
privreq->inflight = remaining;
}
/* And perform the single DMA transfer.
*
* 32.6.10.12 Bulk OUT or Interrupt OUT: Sending a Buffer Using DMA
* - END_B_EN: Can be used for OUT packet truncation (discarding of
* unbuffered packet data) at the end of DMA buffer.
* - END_BUFFIT: Generate an interrupt when BUFF_COUNT in the
* UDPHS_DMASTATUSx register reaches 0.
* - END_TR_EN: End of transfer enable, the UDPHS device can put an
* end to the current DMA transfer, in case of a short packet.
* - END_TR_IT: End of transfer interrupt enable, an interrupt is sent
* after the last USB packet has been transferred by the DMA, if the
* USB transfer ended with a short packet. (Beneficial when the
* receive size is unknown.)
* - CHANN_ENB: Run and stop at end of buffer.
*/
regval = UDPHS_DMACONTROL_ENDBEN | UDPHS_DMACONTROL_ENDBUFFIT |
UDPHS_DMACONTROL_ENDTREN | UDPHS_DMACONTROL_ENDTRIT |
UDPHS_DMACONTROL_CHANNENB;
sam_dma_single(epno, privreq, regval);
}
/****************************************************************************
* Request Helpers
****************************************************************************/
/****************************************************************************
* Name: sam_req_dequeue
****************************************************************************/
static struct sam_req_s *sam_req_dequeue(struct sam_rqhead_s *queue)
{
struct sam_req_s *ret = queue->head;
if (ret)
{
queue->head = ret->flink;
if (!queue->head)
{
queue->tail = NULL;
}
ret->flink = NULL;
}
return ret;
}
/****************************************************************************
* Name: sam_req_enqueue
****************************************************************************/
static void sam_req_enqueue(struct sam_rqhead_s *queue, struct sam_req_s *req)
{
req->flink = NULL;
if (!queue->head)
{
queue->head = req;
queue->tail = req;
}
else
{
queue->tail->flink = req;
queue->tail = req;
}
}
/****************************************************************************
* Name: sam_req_abort
****************************************************************************/
static inline void
sam_req_abort(struct sam_ep_s *privep, struct sam_req_s *privreq, int16_t result)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_REQABORTED),
(uint16_t)USB_EPNO(privep->ep.eplog));
/* Save the result in the request structure */
privreq->req.result = result;
/* Callback to the request completion handler */
privreq->req.callback(&privep->ep, &privreq->req);
}
/****************************************************************************
* Name: sam_req_complete
****************************************************************************/
static void sam_req_complete(struct sam_ep_s *privep, int16_t result)
{
struct sam_req_s *privreq;
irqstate_t flags;
/* Remove the completed request at the head of the endpoint request list */
flags = irqsave();
privreq = sam_req_dequeue(&privep->reqq);
irqrestore(flags);
if (privreq)
{
/* Save the result in the request structure */
privreq->req.result = result;
/* Callback to the request completion handler */
privreq->flink = NULL;
privreq->req.callback(&privep->ep, &privreq->req);
/* Reset the endpoint state and restore the stalled indication */
privep->epstate = UDPHS_EPSTATE_IDLE;
privep->zlpneeded = false;
privep->zlpsent = false;
}
}
/****************************************************************************
* Name: sam_ep_txrdy
*
* Description:
* IN data has been loaded in the endpoint FIFO. Manage the endpoint to
* (1) initiate sending of the data and (2) receive the TXRDY interrupt
* when the transfer completes.
*
****************************************************************************/
static void sam_ep_txrdy(unsigned int epno)
{
/* Set TXRDY to indicate that the packet is ready to send (this works even
* for zero length packets). We will get an TXCOMP interrupt with TXRDY
* cleared. Then we are able to send the next packet.
*/
sam_putreg(UDPHS_EPTSETSTA_TXRDY, SAM_UDPHS_EPTSETSTA(epno));
/* Clear the NAK IN bit to stop NAKing IN tokens from the host. We now
* have data ready to go.
*/
sam_putreg(UDPHS_EPTSTA_NAKIN, SAM_UDPHS_EPTCLRSTA(epno));
/* Enable the TXRDY interrupt on the endpoint */
sam_putreg(UDPHS_EPTCTL_TXRDY, SAM_UDPHS_EPTCTLENB(epno));
}
/****************************************************************************
* Name: sam_req_wrsetup
*
* Description:
* Process the next queued write request for an endpoint that does not
* support DMA.
*
****************************************************************************/
static void sam_req_wrsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep,
struct sam_req_s *privreq)
{
const uint8_t *buf;
uint8_t *fifo;
uint8_t epno;
int nbytes;
/* Get the unadorned endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* Write access to the FIFO is not possible if TXDRY is set */
DEBUGASSERT((sam_getreg(SAM_UDPHS_EPTSTA(epno)) & UDPHS_EPTSTA_TXRDY) == 0);
/* Get the number of bytes remaining to be sent. */
DEBUGASSERT(privreq->req.xfrd < privreq->req.len);
nbytes = privreq->req.len - privreq->req.xfrd;
/* Either send the maxpacketsize or all of the remaining data in
* the request.
*/
if (nbytes >= privep->ep.maxpacket)
{
nbytes = privep->ep.maxpacket;
}
/* This is the new number of bytes "in-flight" */
privreq->inflight = nbytes;
usbtrace(TRACE_WRITE(USB_EPNO(privep->ep.eplog)), nbytes);
/* The new buffer pointer is the started of the buffer plus the number
* of bytes successfully transfered plus the number of bytes previously
* "in-flight".
*/
buf = privreq->req.buf + privreq->req.xfrd;
/* Write packet in the FIFO buffer */
fifo = (uint8_t *)
((uint32_t *)SAM_UDPHSRAM_VSECTION + (EPT_VIRTUAL_SIZE * epno));
for (; nbytes; nbytes--)
{
*fifo++ = *buf++;
}
/* Indicate that there is data in the TX packet memory. This will
* be cleared when the next data out interrupt is received.
*/
privep->epstate = UDPHS_EPSTATE_SENDING;
/* Initiate the transfer and configure to receive the transfer complete
* interrupt.
*/
sam_ep_txrdy(epno);
}
/****************************************************************************
* Name: sam_req_write
*
* Description:
* Process the next queued write request. This function is called in one
* of three contexts: (1) When the endpoint is IDLE and a new write request
* is submitted (with interrupts disabled), (2) from interrupt handling
* when the current transfer completes (either DMA or FIFO), or (3) when
* resuming a stalled IN or control endpoint.
*
* Calling rules:
*
* The transfer state must IDLE
*
* When a request is queued, the request 'len' is the number of bytes
* to transfer and 'xfrd' and 'inflight' must be zero.
*
* When this function starts a tranfer it will update the request
* 'inflight' field to indicate the size of the transfer.
*
* When the transfer completes, the the 'inflight' field must hold the
* number of bytes that have completed the transfer. This function will
* update 'xfrd' with the new size of the transfer.
*
****************************************************************************/
static int sam_req_write(struct sam_usbdev_s *priv, struct sam_ep_s *privep)
{
struct sam_req_s *privreq;
uint32_t regval;
uint32_t eptype;
uint8_t epno;
int bytesleft;
/* Get the unadorned endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* We get here when an IN endpoint interrupt occurs. So now we know that
* there is no TX transfer in progress.
*/
while (privep->epstate == UDPHS_EPSTATE_IDLE)
{
/* Check the request from the head of the endpoint request queue */
privreq = sam_rqpeek(&privep->reqq);
if (!privreq)
{
/* There is no TX transfer in progress and no new pending TX
* requests to send.
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EPINQEMPTY), 0);
/* Get the endpoint type */
regval = sam_getreg(SAM_UDPHS_EPTCFG(epno));
eptype = regval & UDPHS_EPTCFG_TYPE_MASK;
/* Disable interrupts on non-control endpoints */
if (eptype != UDPHS_EPTCFG_TYPE_CTRL8)
{
regval = sam_getreg(SAM_UDPHS_IEN);
regval &= ~UDPHS_INT_EPT(epno);
sam_putreg(regval, SAM_UDPHS_IEN);
}
/* Disable the TXRDY interrupt */
sam_putreg(UDPHS_EPTCTL_TXRDY, SAM_UDPHS_EPTCTLDIS(epno));
return -ENOENT;
}
ullvdbg("epno=%d req=%p: len=%d xfrd=%d inflight=%d zlpneeded=%d\n",
epno, privreq, privreq->req.len, privreq->req.xfrd,
privreq->inflight, privep->zlpneeded);
/* Handle any bytes in flight. */
privreq->req.xfrd += privreq->inflight;
privreq->inflight = 0;
/* Get the number of bytes left to be sent in the packet */
bytesleft = privreq->req.len - privreq->req.xfrd;
if (bytesleft > 0)
{
/* If the size is exactly a full packet, then note if we need to
* send a zero length packet next.
*/
if (bytesleft == privep->ep.maxpacket &&
(privreq->req.flags & USBDEV_REQFLAGS_NULLPKT) != 0)
{
/* Next time we get here, bytesleft will be zero and zlpneeded
* will be set.
*/
privep->zlpneeded = true;
}
else
{
/* No zero packet is forthcoming (maybe later) */
privep->zlpneeded = false;
}
/* The way that we handle the transfer is going to depend on
* whether or not this endpoint supports DMA. In either case
* the endpoint state will transition to SENDING.
*/
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0)
{
sam_dma_wrsetup(priv, privep, privreq);
}
else
{
sam_req_wrsetup(priv, privep, privreq);
}
}
/* No data to send... This can happen on one of two ways:
* (1) The last packet sent was the final packet of a transfer.
* If it was also exactly maxpacketsize and the protocol expects
* a zero length packet to follow then privep->zlpneeded will be
* set. Or (2) we called with a request packet that has
* len == 0 (privep->zlpneeded will not be set). Either case
* means that it is time to send a zero length packet and complete
* this transfer.
*/
else if ((privreq->req.len == 0 || privep->zlpneeded) && !privep->zlpsent)
{
/* If we get here, then we sent the last of the data on the
* previous pass and we need to send the zero length packet now.
*
* A Zero Length Packet can be sent by setting just the TXRDY flag
* in the UDPHS_EPTSETSTAx register
*/
privep->epstate = UDPHS_EPSTATE_SENDING;
privep->zlpneeded = false;
privep->zlpsent = true;
privreq->inflight = 0;
/* Initiate the zero length transfer and configure to receive the
* transfer complete interrupt.
*/
sam_ep_txrdy(epno);
}
/* If all of the bytes were sent (including any final zero length
* packet) then we are finished with the request buffer and we can
* return the request buffer to the class driver. The state will
* remain IDLE only if nothing else was put in flight.
*
* Note that we will then loop to check to check the next queued
* write request.
*/
if (privep->epstate == UDPHS_EPSTATE_IDLE)
{
/* Return the write request to the class driver */
usbtrace(TRACE_COMPLETE(USB_EPNO(privep->ep.eplog)),
privreq->req.xfrd);
DEBUGASSERT(privreq->req.len == privreq->req.xfrd);
sam_req_complete(privep, OK);
}
}
return OK;
}
/****************************************************************************
* Name: sam_req_rddone
*
* Description:
* The last non-DMA OUT transfer has completed. Read 'recvsize' byts from
* the FIFO into the read request buffer.
*
****************************************************************************/
static void sam_req_rddone(struct sam_usbdev_s *priv,
struct sam_ep_s *privep,
struct sam_req_s *privreq, uint16_t recvsize)
{
const uint8_t *fifo;
uint8_t *dest;
int remaining;
int readlen;
int epno;
/* Get the number of bytes that can be received. This is the size of the
* user-provided request buffer, minus the number of bytes already
* transferred to the user-buffer.
*/
remaining = privreq->req.len - privreq->req.xfrd;
/* Read the smaller of the number of bytes available in FIFO and the
* size remaining in the request buffer provided by the caller.
*/
readlen = MIN(remaining, recvsize);
privreq->req.xfrd += readlen;
/* Get the source and destination transfer addresses */
epno = USB_EPNO(privep->ep.eplog);
fifo = (const uint8_t *)
((uint32_t *)SAM_UDPHSRAM_VSECTION + (EPT_VIRTUAL_SIZE * epno));
dest = privreq->req.buf + privreq->req.xfrd;
/* Retrieve packet from the FIFO */
for (; readlen > 0; readlen--)
{
*dest++ = *fifo++;
}
}
/****************************************************************************
* Name: sam_req_rdenable
*
* Description:
* Make sure that the endpoint RXRDY_TXTK interrupt is enabled in order
* to receive the next incoming packet
*
****************************************************************************/
static void sam_req_rdenable(uint8_t epno)
{
uint32_t regval;
regval = sam_getreg(SAM_UDPHS_IEN);
regval |= UDPHS_INT_EPT(epno);
sam_putreg(regval, SAM_UDPHS_IEN);
sam_putreg(UDPHS_EPTCTL_RXRDYTXKL, SAM_UDPHS_EPTCTLENB(epno));
}
/****************************************************************************
* Name: sam_req_rddisable
*
* Description:
* Disable endpoint interrupts
*
****************************************************************************/
static void sam_req_rddisable(uint8_t epno)
{
uint32_t regval;
regval = sam_getreg(SAM_UDPHS_IEN);
regval &= ~UDPHS_INT_EPT(epno);
sam_putreg(regval, SAM_UDPHS_IEN);
sam_putreg(UDPHS_EPTCTL_RXRDYTXKL, SAM_UDPHS_EPTCTLDIS(epno));
}
/****************************************************************************
* Name: sam_req_read
*
* Description:
* Complete the last read request, return the read request to the class
* implementation, and try to started the next queued read request.
*
* This function is called in one of three contexts: (1) When the endpoint
* is IDLE and a new read request is submitted (with interrupts disabled),
* (2) from interrupt handling when the current transfer completes (either
* DMA or FIFO), or (3) when resuming a stalled OUT or control endpoint.
*
* There is a fundamental difference between receiving packets via DMA and
* via the FIFO:
*
* - When receiving data via DMA, then data has already been transferred
* and this function is called on the terminating event. The transfer
* is complete and we just need to check for end of request events and
* if we need to setup the tranfer for the next request.
* - When receiving via the FIFO, the transfer is not complete. The
* data is in the FIFO and must be transferred from the FIFO to the
* request buffer. No setup is needed for the next transfer other than
* assuring that the endpoint RXRDY_TXTK interrupt is enabled.
*
* Calling rules:
*
* The transfer state must IDLE
*
* When a request is queued, the request 'len' is size of the request
* buffer. Any OUT request can be received that will fit in this
* buffer. 'xfrd' and 'inflight' in the request must be zero
* If sam_req_read() is called to start a new transfer, the recvsize
* parameter must be zero.
*
* When this function starts a DMA transfer it will update the request
* 'inflight' field to hold the maximum size of the transfer; but
* 'inflight' is not used with FIFO transfers.
*
* When the transfer completes, the 'recvsize' paramter must be the
* size of the transfer that just completed. For the case of DMA,
* that is the size of the DMA transfer that has just been written to
* memory; for the FIFO transfer, recvsize is the number of bytes
* waiting in the FIFO to be read.
*
****************************************************************************/
static int sam_req_read(struct sam_usbdev_s *priv, struct sam_ep_s *privep,
uint16_t recvsize)
{
struct sam_req_s *privreq;
uint32_t regval;
uint32_t eptype;
uint8_t epno;
DEBUGASSERT(priv && privep && privep->epstate == UDPHS_EPSTATE_IDLE);
/* Loop in case we need to handle multiple read requests */
while (privep->epstate == UDPHS_EPSTATE_IDLE)
{
/* Check the request from the head of the endpoint request queue */
epno = USB_EPNO(privep->ep.eplog);
privreq = sam_rqpeek(&privep->reqq);
if (!privreq)
{
/* No packet to receive data */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EPOUTQEMPTY), epno);
return -ENOENT;
}
ullvdbg("EP%d: len=%d xfrd=%d\n",
epno, privreq->req.len, privreq->req.xfrd);
/* Ignore any attempt to receive a zero length packet */
if (privreq->req.len == 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_EPOUTNULLPACKET), 0);
sam_req_complete(privep, OK);
recvsize = 0;
continue;
}
usbtrace(TRACE_READ(USB_EPNO(privep->ep.eplog)), recvsize);
/* Update the number of bytes transferred with the received size */
privreq->req.xfrd += recvsize;
privreq->inflight = 0;
/* If this was not a DMA transfer, read the incoming data from the FIFO */
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) == 0)
{
sam_req_rddone(priv, privep, privreq, recvsize);
}
/* In case we go through the loop again */
recvsize = 0;
/* If nothing has yet be transferred into the read request, then
* indicate that we are in the RECEIVING state and, if the endpoint
* supports DMA, setup the receive DMA.
*/
if (privreq->req.xfrd == 0)
{
/* Set the RECEIVING state */
privep->epstate = UDPHS_EPSTATE_RECEIVING;
/* If the endpoint supports DMA, set up the DMA now */
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0)
{
/* Set up the next DMA */
sam_dma_rdsetup(priv, privep, privreq);
}
else
{
/* Enable endpoint RXRDY_TXTK interrupts */
sam_req_rdenable(epno);
}
}
/* We will not try to accumulate packet data here. If anything
* has been received, we will complete the transfer immediately and
* give the data to the class driver. The idea is that we will let the
* receiving be in-charge if incoming buffer.
*/
else
{
/* Return the read request to the class driver. */
usbtrace(TRACE_COMPLETE(epno), privreq->req.xfrd);
sam_putreg(UDPHS_EPTCTL_RXRDYTXKL, SAM_UDPHS_EPTCTLDIS(epno));
/* Get the endpoint type */
regval = sam_getreg(SAM_UDPHS_EPTCFG(epno));
eptype = regval & UDPHS_EPTCFG_TYPE_MASK;
/* Disable endpoint interrupts if not the control endpoint */
if (eptype != UDPHS_EPTCFG_TYPE_CTRL8)
{
sam_req_rddisable(epno);
}
/* And complete the request */
privep->epstate = UDPHS_EPSTATE_IDLE;
sam_req_complete(privep, OK);
}
}
return OK;
}
/****************************************************************************
* Name: sam_req_cancel
****************************************************************************/
static void sam_req_cancel(struct sam_ep_s *privep, int16_t result)
{
uint32_t regval;
uint8_t epno;
/* Disable endpoint interrupts if not endpoint 0 */
epno = USB_EPNO(privep->ep.eplog);
if (epno != 0)
{
regval = sam_getreg(SAM_UDPHS_IEN);
regval &= ~UDPHS_INT_DMA(epno);
sam_putreg(regval, SAM_UDPHS_IEN);
}
/* Then complete every queued request with the specified status */
while (!sam_rqempty(&privep->reqq))
{
usbtrace(TRACE_COMPLETE(USB_EPNO(privep->ep.eplog)),
(sam_rqpeek(&privep->reqq))->req.xfrd);
sam_req_complete(privep, result);
}
}
/****************************************************************************
* Interrupt Level Processing
****************************************************************************/
/****************************************************************************
* Name: sam_ep0_read
*
* Description:
* Read a general USB request from the UDPHS FIFO
*
****************************************************************************/
static void sam_ep0_read(uint8_t *buffer, size_t buflen)
{
volatile const uint8_t *fifo;
/* Retrieve packet from the FIFO */
fifo = (volatile const uint8_t *)SAM_UDPHSRAM_VSECTION;
for (; buflen > 0; buflen--)
{
*buffer++ = *fifo++;
}
}
/****************************************************************************
* Name: sam_ep0_wrstatus
*
* Description:
* Process the next queued write request for an endpoint that does not
* support DMA.
*
****************************************************************************/
static void sam_ep0_wrstatus(const uint8_t *buffer, size_t buflen)
{
volatile uint8_t *fifo;
/* Write packet in the FIFO buffer */
fifo = (volatile uint8_t *)SAM_UDPHSRAM_VSECTION;
for (; buflen > 0; buflen--)
{
*fifo++ = *buffer++;
}
/* Initiate the transfer and configure to receive the transfer complete
* interrupt.
*/
sam_ep_txrdy(EP0);
}
/****************************************************************************
* Name: sam_ep0_dispatch
****************************************************************************/
static void sam_ep0_dispatch(struct sam_usbdev_s *priv)
{
uint8_t *dataout;
size_t outlen;
int ret;
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DISPATCH), 0);
if (priv && priv->driver)
{
/* Assume IN SETUP (or OUT SETUP with no data) */
dataout = NULL;
outlen = 0;
/* Was this an OUT SETUP command? */
if (USB_REQ_ISOUT(priv->ctrl.type))
{
uint16_t tmplen = GETUINT16(priv->ctrl.len);
if (tmplen > 0)
{
dataout = priv->ep0out;
outlen = tmplen;
}
}
/* Forward to the control request to the class driver implementation */
ret = CLASS_SETUP(priv->driver, &priv->usbdev, &priv->ctrl,
dataout, outlen);
if (ret < 0)
{
/* Stall on failure */
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_DISPATCHSTALL), 0);
(void)sam_ep_stall(&priv->eplist[EP0].ep, false);
}
}
}
/****************************************************************************
* Name: sam_setdevaddr
****************************************************************************/
static void sam_setdevaddr(struct sam_usbdev_s *priv, uint8_t address)
{
uint32_t regval;
if (address)
{
/* Enable the address */
regval = sam_getreg(SAM_UDPHS_CTRL);
regval &= ~UDPHS_CTRL_DEVADDR_MASK;
regval |= UDPHS_CTRL_DEVADDR(address) | UDPHS_CTRL_FADDREN;
sam_putreg(regval, SAM_UDPHS_CTRL);
/* Go to the addressed state */
priv->devstate = UDPHS_DEVSTATE_ADDRESSED;
}
else
{
/* Disable address */
regval = sam_getreg(SAM_UDPHS_CTRL);
regval &= ~UDPHS_CTRL_FADDREN;
sam_putreg(regval, SAM_UDPHS_CTRL);
/* Revert to the un-addressed, default state */
priv->devstate = UDPHS_DEVSTATE_DEFAULT;
}
}
/****************************************************************************
* Name: sam_ep0_setup
****************************************************************************/
static void sam_ep0_setup(struct sam_usbdev_s *priv)
{
struct sam_ep_s *ep0 = &priv->eplist[EP0];
struct sam_ep_s *privep;
union wb_u value;
union wb_u index;
union wb_u len;
union wb_u response;
enum sam_ep0setup_e ep0result;
uint8_t epno;
int nbytes = 0; /* Assume zero-length packet */
int ret;
/* Terminate any pending requests */
sam_req_cancel(ep0, -EPROTO);
/* Assume NOT stalled; no TX in progress */
ep0->stalled = 0;
ep0->epstate = UDPHS_EPSTATE_IDLE;
/* And extract the little-endian 16-bit values to host order */
value.w = GETUINT16(priv->ctrl.value);
index.w = GETUINT16(priv->ctrl.index);
len.w = GETUINT16(priv->ctrl.len);
ullvdbg("SETUP: type=%02x req=%02x value=%04x index=%04x len=%04x\n",
priv->ctrl.type, priv->ctrl.req, value.w, index.w, len.w);
/* Dispatch any non-standard requests */
if ((priv->ctrl.type & USB_REQ_TYPE_MASK) != USB_REQ_TYPE_STANDARD)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_NOSTDREQ), priv->ctrl.type);
/* Let the class implementation handle all non-standar requests */
sam_ep0_dispatch(priv);
return;
}
/* Handle standard request. Pick off the things of interest to the
* USB device controller driver; pass what is left to the class driver
*/
ep0result = UDPHS_EP0SETUP_SUCCESS;
switch (priv->ctrl.req)
{
case USB_REQ_GETSTATUS:
{
/* type: device-to-host; recipient = device, interface, endpoint
* value: 0
* index: zero interface endpoint
* len: 2; data = status
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_GETSTATUS), priv->ctrl.type);
if (len.w != 2 || (priv->ctrl.type & USB_REQ_DIR_IN) == 0 ||
index.b[MSB] != 0 || value.w != 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEPGETSTATUS), 0);
ep0result = UDPHS_EP0SETUP_STALL;
}
else
{
switch (priv->ctrl.type & USB_REQ_RECIPIENT_MASK)
{
case USB_REQ_RECIPIENT_ENDPOINT:
{
epno = USB_EPNO(index.b[LSB]);
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EPGETSTATUS), epno);
if (epno >= SAM_UDPHS_NENDPOINTS)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEPGETSTATUS), epno);
ep0result = UDPHS_EP0SETUP_STALL;
}
else
{
privep = &priv->eplist[epno];
response.w = 0; /* Not stalled */
nbytes = 2; /* Response size: 2 bytes */
if (privep->stalled)
{
/* Endpoint stalled */
response.b[LSB] = 1; /* Stalled */
}
}
}
break;
case USB_REQ_RECIPIENT_DEVICE:
{
if (index.w == 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DEVGETSTATUS), 0);
/* Features: Remote Wakeup=YES; selfpowered=? */
response.w = 0;
response.b[LSB] = (priv->selfpowered << USB_FEATURE_SELFPOWERED) |
(1 << USB_FEATURE_REMOTEWAKEUP);
nbytes = 2; /* Response size: 2 bytes */
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADDEVGETSTATUS), 0);
ep0result = UDPHS_EP0SETUP_STALL;
}
}
break;
case USB_REQ_RECIPIENT_INTERFACE:
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_IFGETSTATUS), 0);
response.w = 0;
nbytes = 2; /* Response size: 2 bytes */
}
break;
default:
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADGETSTATUS), 0);
ep0result = UDPHS_EP0SETUP_STALL;
}
break;
}
}
}
break;
case USB_REQ_CLEARFEATURE:
{
/* type: host-to-device; recipient = device, interface or endpoint
* value: feature selector
* index: zero interface endpoint;
* len: zero, data = none
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_CLEARFEATURE), priv->ctrl.type);
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) != USB_REQ_RECIPIENT_ENDPOINT)
{
/* Let the class implementation handle all recipients (except for the
* endpoint recipient)
*/
sam_ep0_dispatch(priv);
ep0result = UDPHS_EP0SETUP_DISPATCHED;
}
else
{
/* Endpoint recipient */
epno = USB_EPNO(index.b[LSB]);
if (epno < SAM_UDPHS_NENDPOINTS && index.b[MSB] == 0 &&
value.w == USB_FEATURE_ENDPOINTHALT && len.w == 0)
{
privep = &priv->eplist[epno];
privep->halted = 0;
ret = sam_ep_stall(&privep->ep, true);
if (ret < 0)
{
ep0result = UDPHS_EP0SETUP_STALL;
}
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADCLEARFEATURE), 0);
ep0result = UDPHS_EP0SETUP_STALL;
}
}
}
break;
case USB_REQ_SETFEATURE:
{
/* type: host-to-device; recipient = device, interface, endpoint
* value: feature selector
* index: zero interface endpoint;
* len: 0; data = none
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_SETFEATURE), priv->ctrl.type);
if (((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE) &&
value.w == USB_FEATURE_TESTMODE)
{
/* Special case recipient=device test mode */
ullvdbg("test mode: %d\n", index.w);
}
else if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) != USB_REQ_RECIPIENT_ENDPOINT)
{
/* The class driver handles all recipients except recipient=endpoint */
sam_ep0_dispatch(priv);
ep0result = UDPHS_EP0SETUP_DISPATCHED;
}
else
{
/* Handler recipient=endpoint */
epno = USB_EPNO(index.b[LSB]);
if (epno < SAM_UDPHS_NENDPOINTS && index.b[MSB] == 0 &&
value.w == USB_FEATURE_ENDPOINTHALT && len.w == 0)
{
privep = &priv->eplist[epno];
privep->halted = 1;
ret = sam_ep_stall(&privep->ep, false);
if (ret < 0)
{
ep0result = UDPHS_EP0SETUP_STALL;
}
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADSETFEATURE), 0);
ep0result = UDPHS_EP0SETUP_STALL;
}
}
}
break;
case USB_REQ_SETADDRESS:
{
/* type: host-to-device; recipient = device
* value: device address
* index: 0
* len: 0; data = none
*/
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) != USB_REQ_RECIPIENT_DEVICE ||
index.w != 0 || len.w != 0 || value.w > 127)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADSETADDRESS), 0);
ep0result = UDPHS_EP0SETUP_STALL;
}
else
{
/* Note that setting of the device address will be deferred. A
* zero-length packet will be sent and the device address will
* be set when the zero-length packet transfer completes.
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EP0SETUPSETADDRESS), value.w);
priv->devaddr = value.w;
ep0result = UDPHS_EP0SETUP_ADDRESS;
}
}
break;
case USB_REQ_GETDESCRIPTOR:
/* type: device-to-host; recipient = device
* value: descriptor type and index
* index: 0 or language ID;
* len: descriptor len; data = descriptor
*/
case USB_REQ_SETDESCRIPTOR:
/* type: host-to-device; recipient = device
* value: descriptor type and index
* index: 0 or language ID;
* len: descriptor len; data = descriptor
*/
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_GETSETDESC), priv->ctrl.type);
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE)
{
/* The request seems valid... let the class implementation handle it */
sam_ep0_dispatch(priv);
ep0result = UDPHS_EP0SETUP_DISPATCHED;
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADGETSETDESC), 0);
ep0result = UDPHS_EP0SETUP_STALL;
}
}
break;
case USB_REQ_GETCONFIGURATION:
/* type: device-to-host; recipient = device
* value: 0;
* index: 0;
* len: 1; data = configuration value
*/
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_GETCONFIG), priv->ctrl.type);
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE &&
value.w == 0 && index.w == 0 && len.w == 1)
{
/* The request seems valid... let the class implementation handle it */
sam_ep0_dispatch(priv);
ep0result = UDPHS_EP0SETUP_DISPATCHED;
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADGETCONFIG), 0);
ep0result = UDPHS_EP0SETUP_STALL;
}
}
break;
case USB_REQ_SETCONFIGURATION:
/* type: host-to-device; recipient = device
* value: configuration value
* index: 0;
* len: 0; data = none
*/
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_SETCONFIG), priv->ctrl.type);
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE &&
index.w == 0 && len.w == 0)
{
/* The request seems valid... let the class implementation handle it.
* If the class implementation accespts it new configuration, it will
* call sam_ep_configure() to configure the endpoints.
*/
sam_ep0_dispatch(priv);
ep0result = UDPHS_EP0SETUP_DISPATCHED;
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADSETCONFIG), 0);
ep0result = UDPHS_EP0SETUP_STALL;
}
}
break;
case USB_REQ_GETINTERFACE:
/* type: device-to-host; recipient = interface
* value: 0
* index: interface;
* len: 1; data = alt interface
*/
case USB_REQ_SETINTERFACE:
/* type: host-to-device; recipient = interface
* value: alternate setting
* index: interface;
* len: 0; data = none
*/
{
/* Let the class implementation handle the request */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_GETSETIF), priv->ctrl.type);
sam_ep0_dispatch(priv);
ep0result = UDPHS_EP0SETUP_DISPATCHED;
}
break;
case USB_REQ_SYNCHFRAME:
/* type: device-to-host; recipient = endpoint
* value: 0
* index: endpoint;
* len: 2; data = frame number
*/
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_SYNCHFRAME), 0);
}
break;
default:
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDCTRLREQ), priv->ctrl.req);
ep0result = UDPHS_EP0SETUP_STALL;
}
break;
}
/* Restrict the data length to the length requested in the setup packet */
if (nbytes > len.w)
{
nbytes = len.w;
}
/* At this point, the request has been handled and there are three
* (or four) possible outcomes:
*
* 1a. ep0result == UDPHS_EP0SETUP_SUCCESS
*
* The setup request was successfully handled above and a response
* packet must be sent (may be a zero length packet).
*
* 1b. ep0result == UDPHS_EP0SETUP_ADDRESS
*
* A special case is the case where epstate=UDPHS_EPSTATE_EP0ADDRESS.
* This means that the above processing generated an additional state
* where we need to wait until we complete the status phase before
* applying the new device address.
*
* 2. ep0result == UDPHS_EP0SETUP_DISPATCHED;
*
* The request was forwarded to the class implementation. In case,
* EP0 IN data may have already been sent and the EP0 IN response
* has already been queued? Or perhaps the endpoint has already
* been stalled? This is all under the control of the class driver.
*
* NOTE that for the case of non-standard SETUP requested, those
* requests were forwarded to the class driver and we don't even get
* to this logic.
*
* 3. ep0result == UDPHS_EP0SETUP_STALL;
*
* An error was detected in either the above logic or by the class
* implementation logic.
*/
switch (ep0result)
{
case UDPHS_EP0SETUP_SUCCESS:
{
/* Send the response (might be a zero-length packet) */
ep0->epstate = UDPHS_EPSTATE_EP0STATUSIN;
sam_ep0_wrstatus(response.b, nbytes);
}
break;
case UDPHS_EP0SETUP_ADDRESS:
{
/* Send the response (might be a zero-length packet) */
ep0->epstate = UDPHS_EPSTATE_EP0ADDRESS;
sam_ep0_wrstatus(response.b, nbytes);
}
break;
case UDPHS_EP0SETUP_STALL:
{
/* Stall EP0 */
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_EP0SETUPSTALLED),
priv->ctrl.req);
(void)sam_ep_stall(&priv->eplist[EP0].ep, false);
}
break;
case UDPHS_EP0SETUP_DISPATCHED:
default:
break;
}
}
/****************************************************************************
* Name: sam_dma_interrupt
*
* Description:
* Handle the UDPHS DMA interrupt
*
****************************************************************************/
static void sam_dma_interrupt(struct sam_usbdev_s *priv, int epno)
{
struct sam_ep_s *privep;
struct sam_req_s *privreq;
uintptr_t regaddr;
uint32_t regval;
uint32_t dmastatus;
uint8_t *buf;
int bufcnt;
int xfrsize;
/* Not all endpoints support DMA */
DEBUGASSERT((unsigned)epno < SAM_UDPHS_NENDPOINTS &&
(SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0);
/* Get the endpoint structure */
privep = &priv->eplist[epno];
/* Get the request from the head of the endpoint request queue */
privreq = sam_rqpeek(&privep->reqq);
DEBUGASSERT(privreq);
/* Get the result of the DMA operation */
dmastatus = sam_getreg(SAM_UDPHS_DMASTATUS(epno));
uvdbg("DMA%d DMASTATUS: %08x\n", epno, dmastatus);
/* Disable DMA interrupt to avoid receiving 2 (B_EN and TR_EN) */
regaddr = SAM_UDPHS_DMACONTROL(epno);
regval = sam_getreg(regaddr);
regval &= ~(UDPHS_DMACONTROL_ENDTREN | UDPHS_DMACONTROL_ENDBEN);
sam_putreg(regval, regaddr);
/* Check for end of the buffer. Set by hardware when the BUFF_COUNT
* downcount reaches zero. This could be either an IN or OUT transfer.
*/
if ((dmastatus & UDPHS_DMASTATUS_ENDBFST) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DMAEOB), (uint16_t)dmastatus);
/* BUFF_COUNT holds the number of untransmitted bytes. BUFF_COUNT is
* equal to zero in case of good transfer. BUFF_COUNT was set to
* the 'inflight' count when the DMA started and the BUFF_COUNT has
* now decremented to zero
*/
/* This is just debug logic that only does any if USB debug or tracing
* are enabled. This just verifies taht BUFF_COUNT is zero.
*/
bufcnt = (dmastatus & UDPHS_DMASTATUS_BUFCNT_MASK)
>> UDPHS_DMASTATUS_BUFCNT_SHIFT;
if (bufcnt != 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_ENDBUFST), bufcnt);
}
/* Were we sending? Or receiving? */
if (privep->epstate == UDPHS_EPSTATE_SENDING)
{
/* This is an IN endpoint. Continuing processing the write
* request. We must call sam_req_write in the IDLE state
* with the number of bytes transferred in 'inflight'
*/
DEBUGASSERT(USB_ISEPIN(privep->ep.eplog));
privep->epstate = UDPHS_EPSTATE_IDLE;
(void)sam_req_write(priv, privep);
}
else if (privep->epstate == UDPHS_EPSTATE_RECEIVING)
{
/* privreg->inflight holds the total transfer size */
xfrsize = privreq->inflight;
privreq->inflight = 0;
/* This is an OUT endpoint. Invalidate the data cache for
* region that just completed DMA. This will force the
* buffer data to be reloaded from RAM when it is accessed.
*/
DEBUGASSERT(USB_ISEPOUT(privep->ep.eplog));
buf = &privreq->req.buf[privreq->req.xfrd];
cp15_invalidate_dcache((uintptr_t)buf, (uintptr_t)buf + xfrsize);
/* Complete this transfer, return the request to the class
* implementation, and try to start the next, queue read request.
* We must call sam_req_read in the IDLE state, 'inflight' is
* ignored (should be zero) and the transfer size is passed as
* an argument to sam_req_read().
*/
privep->epstate = UDPHS_EPSTATE_IDLE;
(void)sam_req_read(priv, privep, xfrsize);
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEOBSTATE), bufcnt);
}
}
/* Check for end of channel transfer. END_TR_ST is set by hardware when
* the last packet transfer is complete iff END_TR_EN is set in the
* DMACONTROL rgister. The request is complete.
*
* "Used for OUT transfers only.
*
* "0 = USB end of transfer is ignored.
* "1 = UDPHS device can put an end to the current buffer transfer.
*
* "When set, a BULK or INTERRUPT short packet or the last packet of
* an ISOCHRONOUS (micro) frame (DATAX) will close the current buffer
* and the UDPHS_DMASTATUSx register END_TR_ST flag will be raised."
*/
else if ((dmastatus & UDPHS_DMASTATUS_ENDTRST) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DMAEOC), (uint16_t)dmastatus);
DEBUGASSERT(privep->epstate == UDPHS_EPSTATE_RECEIVING &&
USB_ISEPOUT(privep->ep.eplog));
/* Get the number of bytes transferred from the DMA status.
*
* BUFF_COUNT holds the number of untransmitted bytes. In this case,
* BUFF_COUNT should not be zero. BUFF_COUNT was set to the
* 'inflight' count when the DMA started so the difference will
* give us the actual size of the transfer.
*/
bufcnt = ((dmastatus & UDPHS_DMASTATUS_BUFCNT_MASK)
>> UDPHS_DMASTATUS_BUFCNT_SHIFT);
xfrsize = privreq->inflight - bufcnt;
privreq->inflight = 0;
/* Invalidate the data cache for region that just completed DMA.
* This will force the buffer data to be reloaded from RAM.
*/
buf = &privreq->req.buf[privreq->req.xfrd];
cp15_invalidate_dcache((uintptr_t)buf, (uintptr_t)buf + xfrsize);
/* Complete this transfer, return the request to the class
* implementation, and try to start the next, queue read request.
*/
privep->epstate = UDPHS_EPSTATE_IDLE;
(void)sam_req_read(priv, privep, xfrsize);
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_DMAERR), (uint16_t)dmastatus);
/* Return the request buffer to the class implementation with the I/O
* error indication.
*/
sam_req_complete(privep, -EIO);
}
}
/****************************************************************************
* Name: sam_ep_interrupt
*
* Description:
* Handle the UDPHS endpoint interrupt
*
****************************************************************************/
static void sam_ep_interrupt(struct sam_usbdev_s *priv, int epno)
{
struct sam_ep_s *privep;
uint32_t eptsta;
uint32_t eptype;
uint32_t regval;
uint16_t pktsize;
DEBUGASSERT((unsigned)epno < SAM_UDPHS_NENDPOINTS);
/* Get the endpoint structure */
privep = &priv->eplist[epno];
/* Get the endpoint status */
eptsta = sam_getreg(SAM_UDPHS_EPTSTA(epno));
/* Get the endpoint type */
regval = sam_getreg(SAM_UDPHS_EPTCFG(epno));
eptype = regval & UDPHS_EPTCFG_TYPE_MASK;
/* IN packet sent */
if ((sam_getreg(SAM_UDPHS_EPTCTL(epno)) & UDPHS_EPTCTL_TXRDY) != 0 &&
(eptsta & UDPHS_EPTSTA_TXRDY) == 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_TXRDY), (uint16_t)eptsta);
/* Sending state. This is the completion of a "normal" write request
* transfer. In this case, we need to resume request processing in
* order to send the next outgoing packet.
*/
if (privep->epstate == UDPHS_EPSTATE_SENDING ||
privep->epstate == UDPHS_EPSTATE_EP0STATUSIN)
{
/* Continue/resume processing the write requests. TXRDY will
* be disabled when the last transfer completes.
*/
privep->epstate = UDPHS_EPSTATE_IDLE;
(void)sam_req_write(priv, privep);
}
/* Setting of the device address is a special case. The address was
* obtained when a preceding SETADDRESS SETUP command was processed.
* But the address is not set until the final SETUP status phase
* completes. This interrupt indicates the completion of that status
* phase and now we set the address.
*/
else if (privep->epstate == UDPHS_EPSTATE_EP0ADDRESS)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_ADDRESSED), priv->devaddr);
DEBUGASSERT(epno == EP0);
/* Set the device address */
privep->epstate = UDPHS_EPSTATE_IDLE;
sam_setdevaddr(priv, priv->devaddr);
/* Disable the further TXRDY interrupts on EP0. */
sam_putreg(UDPHS_EPTCTL_TXRDY, SAM_UDPHS_EPTCTLDIS(epno));
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_TXRDYERR), privep->epstate);
sam_putreg(UDPHS_EPTCTL_TXRDY, SAM_UDPHS_EPTCTLDIS(epno));
}
}
/* OUT packet received */
if ((eptsta & UDPHS_EPTSTA_RXRDYTXKL) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_RXRDY), (uint16_t)eptsta);
/* Are we receiving data for a read request? */
if (privep->epstate == UDPHS_EPSTATE_RECEIVING)
{
/* Yes, get the size of the packet that we just received */
pktsize = (uint16_t)
((eptsta & UDPHS_EPTSTA_BYTECNT_MASK) >>
UDPHS_EPTSTA_BYTECNT_SHIFT);
/* And continue processing the read request, clearing RXRDYTXKL in
* order to receive more data.
*/
privep->epstate = UDPHS_EPSTATE_IDLE;
sam_req_read(priv, privep, pktsize);
sam_putreg(UDPHS_EPTSTA_RXRDYTXKL, SAM_UDPHS_EPTCLRSTA(epno));
}
/* Did we just receive the data associated with an OUT SETUP command? */
else if (privep->epstate == UDPHS_EPSTATE_EP0DATAOUT)
{
uint16_t len;
/* Yes.. back to the IDLE state */
privep->epstate = UDPHS_EPSTATE_IDLE;
/* Get the size of the packet that we just received */
pktsize = (uint16_t)
((eptsta & UDPHS_EPTSTA_BYTECNT_MASK) >>
UDPHS_EPTSTA_BYTECNT_SHIFT);
/* Get the size that we expected to receive */
len = GETUINT16(priv->ctrl.len);
if (len == pktsize)
{
/* Copy the OUT data from the EP0 FIFO into a special EP0 buffer
* and clear RXRDYTXKL in order to receive more data.
*/
sam_ep0_read(priv->ep0out, len);
sam_putreg(UDPHS_EPTSTA_RXRDYTXKL, SAM_UDPHS_EPTCLRSTA(epno));
/* And handle the EP0 SETUP now. */
sam_ep0_setup(priv);
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_EP0SETUPOUTSIZE), pktsize);
/* STALL and discard received data. */
(void)sam_ep_stall(&privep->ep, false);
sam_putreg(UDPHS_EPTSTA_RXRDYTXKL, SAM_UDPHS_EPTCLRSTA(epno));
}
}
else
{
/* Check if ACK received on a Control EP */
if (eptype == UDPHS_EPTCFG_TYPE_CTRL8 &&
(eptsta & UDPHS_EPTSTA_BYTECNT_MASK) == 0)
{
}
/* Data has been STALLed */
else if ((eptsta & UDPHS_EPTSTA_FRCESTALL) != 0)
{
}
/* NAK the data */
else
{
regval = sam_getreg(SAM_UDPHS_IEN);
regval &= ~UDPHS_INT_EPT(epno);
sam_putreg(regval, SAM_UDPHS_IEN);
}
/* Discard any received data and clear UDPHS_EPTSTA_RXRDYTXKL so that we
* may receive more data.
*/
sam_putreg(UDPHS_EPTSTA_RXRDYTXKL, SAM_UDPHS_EPTCLRSTA(epno));
}
}
/* STALL sent */
if ((eptsta & UDPHS_EPTSTA_STALLSNT) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_STALLSNT), (uint16_t)eptsta);
/* Acknowledge */
sam_putreg(UDPHS_EPTSTA_STALLSNT, SAM_UDPHS_EPTCLRSTA(epno));
/* ISO error */
if (eptype == UDPHS_EPTCFG_TYPE_ISO)
{
privep->epstate = UDPHS_EPSTATE_IDLE;
sam_req_complete(privep, -EIO);
}
/* If EP is not halted, clear STALL */
else if (privep->epstate != UDPHS_EPSTATE_STALLED)
{
sam_putreg(UDPHS_EPTSTA_FRCESTALL, SAM_UDPHS_EPTCLRSTA(epno));
}
}
/* SETUP packet received */
if ((eptsta & UDPHS_EPTSTA_RXSETUP) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_RXSETUP), (uint16_t)eptsta);
/* If a request transfer was pending, complete it. Handle the case
* where during the status phase of a control write transfer, the host
* receives the device ZLP and ack it, but the ack is not received by the
* device
*/
if (privep->epstate == UDPHS_EPSTATE_RECEIVING ||
privep->epstate == UDPHS_EPSTATE_SENDING)
{
sam_req_complete(privep, -EPROTO);
}
/* ISO Err Flow */
if (eptype == UDPHS_EPTCFG_TYPE_ISO)
{
/* Acknowledge setup packet */
sam_putreg(UDPHS_EPTSTA_RXSETUP, SAM_UDPHS_EPTCLRSTA(epno));
}
else
{
uint16_t len;
/* Copy setup data from the EP0 FIFO into the driver structure. */
sam_ep0_read((uint8_t *)&priv->ctrl, USB_SIZEOF_CTRLREQ);
/* Acknowledge setup packet */
sam_putreg(UDPHS_EPTSTA_RXSETUP, SAM_UDPHS_EPTCLRSTA(epno));
/* Check for a SETUP IN transaction */
len = GETUINT16(priv->ctrl.len);
if (USB_REQ_ISOUT(priv->ctrl.type) && len > 0)
{
/* Yes.. then we have to wait for the OUT data phase to
* complete before processing the SETUP command.
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EP0SETUPOUT), priv->ctrl.req);
privep->epstate = UDPHS_EPSTATE_EP0DATAOUT;
}
else
{
/* This is an SETUP IN command (or a SETUP IN with no data).
* Handle the EP0 SETUP now.
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EP0SETUPIN), len);
privep->epstate = UDPHS_EPSTATE_IDLE;
sam_ep0_setup(priv);
}
}
}
}
/****************************************************************************
* Name: sam_udphs_interrupt
*
* Description:
* Handle the UDPHS interrupt
*
****************************************************************************/
static int sam_udphs_interrupt(int irq, void *context)
{
/* For now there is only one USB controller, but we will always refer to
* it using a pointer to make any future ports to multiple UDPHS controllers
* easier.
*/
struct sam_usbdev_s *priv = &g_udphs;
uint32_t intsta;
uint32_t pending;
uint32_t regval;
int i;
/* Get the set of pending interrupts */
intsta = sam_getreg(SAM_UDPHS_INTSTA);
usbtrace(TRACE_INTENTRY(SAM_TRACEINTID_INTERRUPT), intsta);
regval = sam_getreg(SAM_UDPHS_IEN);
pending = intsta & regval;
/* Handle all pending UDPHS interrupts (and new interrupts that become
* pending)
*/
while (pending)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_PENDING), (uint16_t)pending);
/* Suspend, treated last */
if ((pending == UDPHS_INT_DETSUSPD) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DETSUSPD), (uint16_t)pending);
/* Enable wakeup interrupts */
regval = sam_getreg(SAM_UDPHS_IEN);
regval &= ~UDPHS_INT_DETSUSPD;
regval |= (UDPHS_INT_WAKEUP | UDPHS_INT_ENDOFRSM);
sam_putreg(regval, SAM_UDPHS_IEN);
/* Acknowledge interrupt */
sam_putreg(UDPHS_INT_DETSUSPD | UDPHS_INT_WAKEUP, SAM_UDPHS_CLRINT);
sam_suspend(priv);
}
/* SOF interrupt*/
else if ((pending & UDPHS_INT_INTSOF) != 0)
{
/* Acknowledge interrupt */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_INTSOF), (uint16_t)pending);
sam_putreg(UDPHS_INT_INTSOF, SAM_UDPHS_CLRINT);
}
/* Resume */
else if ((pending & UDPHS_INT_WAKEUP) != 0 ||
(pending & UDPHS_INT_ENDOFRSM) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_WAKEUP), (uint16_t)pending);
sam_resume(priv);
/* Acknowledge interrupt */
sam_putreg(UDPHS_INT_WAKEUP | UDPHS_INT_ENDOFRSM | UDPHS_INT_DETSUSPD,
SAM_UDPHS_CLRINT);
/* Enable suspend interrupts */
regval = sam_getreg(SAM_UDPHS_IEN);
regval &= ~UDPHS_INT_WAKEUP;
regval |= (UDPHS_INT_ENDOFRSM | UDPHS_INT_DETSUSPD);
sam_putreg(regval, SAM_UDPHS_IEN);
}
/* End of Reset. Set by hardware when an End Of Reset has been
* detected by the UDPHS controller. Automatically enabled after USB
* reset.
*
* Paragraph 32.6.11, Speed Identification
*
* "The high speed reset is managed by the hardware.
*
* "At the connection, the host makes a reset which could be a
* classic reset (full speed) or a high speed reset.
*
* "At the end of the reset process (full or high), the ENDRESET
* interrupt is generated.
*
* "Then the CPU should read the SPEED bit in UDPHS_INTSTAx to
* ascertain the speed mode of the device."
*
* Paragraph 32.6.14.4 From Powered State to Default State (reset)
* "After its connection to a USB host, the USB device waits for an
* end-of-bus reset. The unmasked flag ENDRESET is set in the
* UDPHS_IEN register and an interrupt is triggered.
*
* "Once the ENDRESET interrupt has been triggered, the device
* enters Default State. In this state, the UDPHS software must:
*
* - Enable the default endpoint, setting the EPT_ENABL flag in
* the UDPHS_EPTCTLENB[0] register and, optionally, enabling
* the interrupt for endpoint 0 by writing 1 in EPT_0 of the
* UDPHS_IEN register. The enumeration then begins by a control
* transfer.
* - Configure the Interrupt Mask Register which has been reset
* by the USB reset detection
* - Enable the transceiver.
*
* "In this state, the EN_UDPHS bit in UDPHS_CTRL register must be
* enabled."
*/
if ((pending & UDPHS_INT_ENDRESET) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_ENDRESET), (uint16_t)pending);
/* Handle the reset */
sam_reset(priv);
/* Get the device speed */
if ((sam_getreg(SAM_UDPHS_INTSTA) & UDPHS_INTSTA_SPEED) > 0)
{
priv->usbdev.speed = USB_SPEED_HIGH;
}
else
{
priv->usbdev.speed = USB_SPEED_FULL;
}
}
/* Upstream resume */
else if ((pending & UDPHS_INT_UPSTRRES) != 0)
{
/* Acknowledge interrupt */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_UPSTRRES), (uint16_t)pending);
sam_putreg(UDPHS_INT_UPSTRRES, SAM_UDPHS_CLRINT);
}
/* DMA interrupts */
else if ((pending & UDPHS_INT_DMA_MASK) != 0)
{
for (i = 1; i <= SAM_UDPHS_NDMACHANNELS; i++)
{
if ((pending & UDPHS_INT_DMA(i)) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DMA), (uint16_t)i);
sam_dma_interrupt(priv, i);
}
}
}
/* Endpoint Interrupts */
else if ((pending & UDPHS_INT_EPT_MASK) != 0)
{
for (i = 0; i < SAM_UDPHS_NENDPOINTS; i++)
{
if ((pending & UDPHS_INT_EPT(i)) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EP), (uint16_t)i);
sam_ep_interrupt(priv, i);
}
}
}
/* Re-sample the set of pending interrupts */
intsta = sam_getreg(SAM_UDPHS_INTSTA);
regval = sam_getreg(SAM_UDPHS_IEN);
pending = intsta & regval;
}
usbtrace(TRACE_INTEXIT(SAM_TRACEINTID_INTERRUPT), intsta);
return OK;
}
/****************************************************************************
* Suspend/Resume Helpers
****************************************************************************/
/****************************************************************************
* Name: sam_suspend
****************************************************************************/
static void sam_suspend(struct sam_usbdev_s *priv)
{
/* Don't do anything if the device is already suspended */
if (priv->devstate != UDPHS_DEVSTATE_SUSPENDED)
{
/* Notify the class driver of the suspend event */
if (priv->driver)
{
CLASS_SUSPEND(priv->driver, &priv->usbdev);
}
/* Switch to the Suspended state */
priv->prevstate = priv->devstate;
priv->devstate = UDPHS_DEVSTATE_SUSPENDED;
/* Disable clocking to the UDPHS peripheral
*
* NOTE: The Atmel sample code disables USB clocking here (via the PMC
* CKGR_UCKR). However, we cannot really do that here because that
* clocking is also needed by the UHPHS host.
*/
sam_udphs_disableclk();
/* Let the board-specific logic know that we have entered the
* suspend state. This may trigger additional reduced power
* consumuption measures.
*/
sam_usbsuspend((struct usbdev_s *)priv, false);
}
}
/****************************************************************************
* Name: sam_resume
****************************************************************************/
static void sam_resume(struct sam_usbdev_s *priv)
{
/* This function is called when either (1) a WKUP interrupt is received from
* the host PC, or (2) the class device implementation calls the wakeup()
* method.
*/
/* Don't do anything if the device was not suspended */
if (priv->devstate == UDPHS_DEVSTATE_SUSPENDED)
{
/* Enable clocking to the UDPHS peripheral.
*
* NOTE: In the Atmel example code, they also enable USB clocking
* at this point (via the BIAS in the CKGR_UCKR register). In this
* implementation, that should not be necessary here because we
* never disable BIAS to begin with.
*/
sam_udphs_enableclk();
/* Revert to the previous state */
priv->devstate = priv->prevstate;
/* Restore full power -- whatever that means for this particular board */
sam_usbsuspend((struct usbdev_s *)priv, true);
/* Notify the class driver of the resume event */
if (priv->driver)
{
CLASS_RESUME(priv->driver, &priv->usbdev);
}
}
}
/****************************************************************************
* Endpoint Helpers
****************************************************************************/
/****************************************************************************
* Name: sam_ep_reset
*
* Description
* Reset and disable a set of endpoints.
*
****************************************************************************/
static void sam_ep_reset(struct sam_usbdev_s *priv, uint8_t epno)
{
struct sam_ep_s *privep = &priv->eplist[epno];
uint32_t regval;
/* Disable endpoint interrupt */
regval = sam_getreg(SAM_UDPHS_IEN);
regval &= ~UDPHS_INT_EPT(epno);
sam_putreg(regval, SAM_UDPHS_IEN);
/* Cancel any queued requests. Since they are canceled with status
* -ESHUTDOWN, then will not be requeued until the configuration is reset.
* NOTE: This should not be necessary... the CLASS_DISCONNECT above
* should result in the class implementation calling sam_ep_disable
* for each of its configured endpoints.
*/
sam_req_cancel(privep, -ESHUTDOWN);
/* Reset endpoint */
sam_putreg(UDPHS_EPTRST(epno), SAM_UDPHS_EPTRST);
/* Reset endpoint status */
privep->epstate = UDPHS_EPSTATE_DISABLED;
privep->stalled = false;
privep->halted = false;
privep->zlpneeded = false;
privep->zlpsent = false;
privep->bank = 0;
}
/****************************************************************************
* Name: sam_epset_reset
*
* Description
* Reset and disable a set of endpoints.
*
****************************************************************************/
static void sam_epset_reset(struct sam_usbdev_s *priv, uint16_t epset)
{
uint32_t bit;
int epno;
/* Reset each endpoint in the set */
for (epno = 0, bit = 1, epset &= SAM_EPSET_ALL;
epno < SAM_UDPHS_NENDPOINTS && epset != 0;
epno++, bit <<= 1)
{
/* Is this endpoint in the set? */
if ((epset & bit) != 0)
{
/* Yes.. reset it */
sam_ep_reset(priv, epno);
epset &= ~bit;
}
}
}
/****************************************************************************
* Name: sam_ep_reserve
*
* Description:
* Find and un-reserved endpoint number and reserve it for the caller.
*
****************************************************************************/
static inline struct sam_ep_s *
sam_ep_reserve(struct sam_usbdev_s *priv, uint8_t epset)
{
struct sam_ep_s *privep = NULL;
irqstate_t flags;
int epndx = 0;
flags = irqsave();
epset &= priv->epavail;
if (epset)
{
/* Select the lowest bit in the set of matching, available endpoints
* (skipping EP0)
*/
for (epndx = 1; epndx < SAM_UDPHS_NENDPOINTS; epndx++)
{
uint8_t bit = SAM_EP_BIT(epndx);
if ((epset & bit) != 0)
{
/* Mark the endpoint no longer available */
priv->epavail &= ~bit;
/* And return the pointer to the standard endpoint structure */
privep = &priv->eplist[epndx];
break;
}
}
}
irqrestore(flags);
return privep;
}
/****************************************************************************
* Name: sam_ep_unreserve
*
* Description:
* The endpoint is no long in-used. It will be un-reserved and can be
* re-used if needed.
*
****************************************************************************/
static inline void
sam_ep_unreserve(struct sam_usbdev_s *priv, struct sam_ep_s *privep)
{
irqstate_t flags = irqsave();
priv->epavail |= SAM_EP_BIT(USB_EPNO(privep->ep.eplog));
irqrestore(flags);
}
/****************************************************************************
* Name: sam_ep_reserved
*
* Description:
* Check if the endpoint has already been allocated.
*
****************************************************************************/
static inline bool
sam_ep_reserved(struct sam_usbdev_s *priv, int epno)
{
return ((priv->epavail & SAM_EP_BIT(epno)) == 0);
}
/****************************************************************************
* Name: sam_ep_configure_internal
*
* Description:
* This is the internal implementation of the endpoint configuration logic
* and implements the endpoint configuration method of the usbdev_ep_s
* interface. As an internal interface, it will be used to configure
* endpoint 0 which is not available to the class implementation.
*
****************************************************************************/
static int sam_ep_configure_internal(struct sam_ep_s *privep,
const struct usb_epdesc_s *desc)
{
struct sam_usbdev_s *priv;
uintptr_t regaddr;
uint32_t regval;
uint16_t maxpacket;
uint8_t epno;
uint8_t eptype;
uint8_t nbtrans;
bool dirin;
uvdbg("len: %02x type: %02x addr: %02x attr: %02x "
"maxpacketsize: %02x %02x interval: %02x\n",
desc->len, desc->type, desc->addr, desc->attr,
desc->mxpacketsize[0], desc->mxpacketsize[1],
desc->interval);
/* Decode the endpoint descriptor */
epno = USB_EPNO(desc->addr);
dirin = (desc->addr & USB_DIR_MASK) == USB_REQ_DIR_IN;
eptype = (desc->attr & USB_EP_ATTR_XFERTYPE_MASK) >> USB_EP_ATTR_XFERTYPE_SHIFT;
maxpacket = GETUINT16(desc->mxpacketsize);
nbtrans = 1;
/* Special case maxpacket handling for high-speed endpoints */
priv = privep->dev;
if (priv->usbdev.speed == USB_SPEED_HIGH)
{
/* HS Interval, 125us */
/* MPS: Bits 12:11 specify NB_TRANS, as USB 2.0 Spec. */
nbtrans = ((maxpacket >> 11) & 3);
if (nbtrans == 3)
{
nbtrans = 1;
}
else
{
nbtrans++;
}
/* Mask, bit 10..0 is the max packet size */
maxpacket &= 0x7ff;
}
/* Initialize the endpoint structure */
privep->ep.eplog = desc->addr; /* Includes direction */
privep->ep.maxpacket = maxpacket;
privep->epstate = UDPHS_EPSTATE_IDLE;
privep->bank = SAM_UDPHS_NBANKS(epno);
/* Initialize the endpoint hardware */
/* Disable the endpoint */
sam_putreg(UDPHS_EPTCTL_SHRTPCKT | UDPHS_EPTCTL_BUSYBANK |
UDPHS_EPTCTL_NAKOUT | UDPHS_EPTCTL_NAKIN |
UDPHS_EPTCTL_STALLSNT | UDPHS_EPTCTL_STALLSNT |
UDPHS_EPTCTL_TXRDY | UDPHS_EPTCTL_RXRDYTXKL |
UDPHS_EPTCTL_ERROVFLW | UDPHS_EPTCTL_MDATARX |
UDPHS_EPTCTL_DATAXRX | UDPHS_EPTCTL_NYETDIS |
UDPHS_EPTCTL_INTDISDMA | UDPHS_EPTCTL_AUTOVALID |
UDPHS_EPTCTL_EPTENABL,
SAM_UDPHS_EPTCTLDIS(epno));
/* Reset Endpoint Fifos */
sam_putreg(UDPHS_EPTSTA_TOGGLESQ_MASK | UDPHS_EPTSTA_FRCESTALL,
SAM_UDPHS_EPTCLRSTA(epno));
sam_putreg(UDPHS_EPTRST(epno), SAM_UDPHS_EPTRST);
/* If this is EP0, disable interrupts now */
if (eptype == USB_EP_ATTR_XFER_CONTROL)
{
regval = sam_getreg(SAM_UDPHS_IEN);
regval &= ~UDPHS_INT_EPT(epno);
sam_putreg(regval, SAM_UDPHS_IEN);
}
/* Configure the endpoint */
regaddr = SAM_UDPHS_EPTCFG(epno);
regval = sam_getreg(regaddr) & UDPHS_EPTCFG_MAPD;
if (maxpacket <= 8)
{
regval |= UDPHS_EPTCFG_SIZE_8;
}
else if (maxpacket <= 16)
{
regval |= UDPHS_EPTCFG_SIZE_16;
}
else if (maxpacket <= 32)
{
regval |= UDPHS_EPTCFG_SIZE_32;
}
else if (maxpacket <= 64)
{
regval |= UDPHS_EPTCFG_SIZE_64;
}
else if (maxpacket <= 128)
{
regval |= UDPHS_EPTCFG_SIZE_128;
}
else if (maxpacket <= 256)
{
regval |= UDPHS_EPTCFG_SIZE_256;
}
else if (maxpacket <= 512)
{
regval |= UDPHS_EPTCFG_SIZE_512;
}
else if (maxpacket <= 1024)
{
regval |= UDPHS_EPTCFG_SIZE_1024;
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEPTYPE), eptype);
DEBUGPANIC();
regval |= UDPHS_EPTCFG_SIZE_8;
}
regval |= ((uint32_t)dirin << 3) | ((uint32_t)eptype << 4) |
((uint32_t)(privep->bank) << 6) | ((uint32_t)nbtrans << 8);
sam_putreg(regval, regaddr);
/* Verify that the EPT_MAPD flag is set. This flag is set if the
* endpoint size and the number of banks are correct compared to
* the FIFO maximum capacity and the maximum number of allowed banks.
*/
if ((sam_getreg(regaddr) & UDPHS_EPTCFG_MAPD) == 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_EPTCFGMAPD), epno);
return -EINVAL;
}
/* Enable the endpoint. The way that the endpoint is enabled depends of
* if the endpoint supports DMA transfers or not.
*/
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0)
{
/* Select AUTO_VALID so that the hardware will manage RXRDY_TXKL
* and TXRDY.
*/
regval = UDPHS_EPTCTL_AUTOVALID | UDPHS_EPTCTL_EPTENABL;
}
else
{
/* No DMA... Software will manage RXRDY_TXKL and TXRDY. */
regval = UDPHS_EPTCTL_RXRDYTXKL | UDPHS_EPTCTL_RXSETUP |
UDPHS_EPTCTL_EPTENABL;
}
sam_putreg(regval, SAM_UDPHS_EPTCTLENB(epno));
sam_dumpep(priv, epno);
return OK;
}
/****************************************************************************
* Endpoint operations
****************************************************************************/
/****************************************************************************
* Name: sam_ep_configure
*
* Description:
* This is the endpoint configuration method of the usbdev_ep_s interface.
*
****************************************************************************/
static int sam_ep_configure(struct usbdev_ep_s *ep,
const struct usb_epdesc_s *desc,
bool last)
{
struct sam_ep_s *privep = (struct sam_ep_s *)ep;
struct sam_usbdev_s *priv;
int ret;
/* Verify parameters. Endpoint 0 is not available at this interface */
#if defined(CONFIG_DEBUG) || defined(CONFIG_USBDEV_TRACE)
uint8_t epno = USB_EPNO(desc->addr);
usbtrace(TRACE_EPCONFIGURE, (uint16_t)epno);
DEBUGASSERT(ep && desc && epno > 0 && epno < SAM_UDPHS_NENDPOINTS);
DEBUGASSERT(epno == USB_EPNO(ep->eplog));
#endif
/* This logic is implemented in sam_ep_configure_internal */
ret = sam_ep_configure_internal(privep, desc);
if (ret == OK && last)
{
/* If this was the last endpoint, then the class driver is fully
* configured.
*/
priv = privep->dev;
priv->devstate = UDPHS_DEVSTATE_CONFIGURED;
}
return ret;
}
/****************************************************************************
* Name: sam_ep_disable
*
* Description:
* This is the disable() method of the USB device endpoint structure.
*
****************************************************************************/
static int sam_ep_disable(struct usbdev_ep_s *ep)
{
struct sam_ep_s *privep = (struct sam_ep_s *)ep;
struct sam_usbdev_s *priv;
irqstate_t flags;
uint8_t epno;
#ifdef CONFIG_DEBUG
if (!ep)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
ulldbg("ERROR: ep=%p\n", ep);
return -EINVAL;
}
#endif
epno = USB_EPNO(ep->eplog);
usbtrace(TRACE_EPDISABLE, epno);
/* Reset the endpoint and cancel any ongoing activity */
flags = irqsave();
priv = privep->dev;
sam_ep_reset(priv, epno);
/* Revert to the addressed-but-not-configured state */
priv->devstate = UDPHS_DEVSTATE_ADDRESSED;
irqrestore(flags);
return OK;
}
/****************************************************************************
* Name: sam_ep_allocreq
*
* Description:
* This is the allocreq() method of the USB device endpoint structure.
*
****************************************************************************/
static struct usbdev_req_s *sam_ep_allocreq(struct usbdev_ep_s *ep)
{
struct sam_req_s *privreq;
#ifdef CONFIG_DEBUG
if (!ep)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return NULL;
}
#endif
usbtrace(TRACE_EPALLOCREQ, USB_EPNO(ep->eplog));
privreq = (struct sam_req_s *)kmalloc(sizeof(struct sam_req_s));
if (!privreq)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_ALLOCFAIL), 0);
return NULL;
}
memset(privreq, 0, sizeof(struct sam_req_s));
return &privreq->req;
}
/****************************************************************************
* Name: sam_ep_freereq
*
* Description:
* This is the freereq() method of the USB device endpoint structure.
*
****************************************************************************/
static void sam_ep_freereq(struct usbdev_ep_s *ep, struct usbdev_req_s *req)
{
struct sam_req_s *privreq = (struct sam_req_s*)req;
#ifdef CONFIG_DEBUG
if (!ep || !req)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return;
}
#endif
usbtrace(TRACE_EPFREEREQ, USB_EPNO(ep->eplog));
kfree(privreq);
}
/****************************************************************************
* Name: sam_ep_allocbuffer
*
* Description:
* This is the allocbuffer() method of the USB device endpoint structure.
*
****************************************************************************/
#ifdef CONFIG_USBDEV_DMA
static void *sam_ep_allocbuffer(struct usbdev_ep_s *ep, uint16_t nbytes)
{
/* There is not special buffer allocation requirement */
return kumalloc(nbytes);
}
#endif
/****************************************************************************
* Name: sam_ep_freebuffer
*
* Description:
* This is the freebuffer() method of the USB device endpoint structure.
*
****************************************************************************/
#ifdef CONFIG_USBDEV_DMA
static void sam_ep_freebuffer(struct usbdev_ep_s *ep, void *buf)
{
/* There is not special buffer allocation requirement */
kufree(buf);
}
#endif
/****************************************************************************
* Name: sam_ep_submit
*
* Description:
* This is the submit() method of the USB device endpoint structure.
*
****************************************************************************/
static int sam_ep_submit(struct usbdev_ep_s *ep, struct usbdev_req_s *req)
{
struct sam_req_s *privreq = (struct sam_req_s *)req;
struct sam_ep_s *privep = (struct sam_ep_s *)ep;
struct sam_usbdev_s *priv;
irqstate_t flags;
uint8_t epno;
int ret = OK;
#ifdef CONFIG_DEBUG
if (!req || !req->callback || !req->buf || !ep)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
ulldbg("ERROR: req=%p callback=%p buf=%p ep=%p\n", req, req->callback, req->buf, ep);
return -EINVAL;
}
#endif
usbtrace(TRACE_EPSUBMIT, USB_EPNO(ep->eplog));
priv = privep->dev;
#ifdef CONFIG_DEBUG
if (!priv->driver)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_NOTCONFIGURED), priv->usbdev.speed);
ulldbg("ERROR: driver=%p\n", priv->driver);
return -ESHUTDOWN;
}
#endif
/* Handle the request from the class driver */
epno = USB_EPNO(ep->eplog);
req->result = -EINPROGRESS;
req->xfrd = 0;
privreq->inflight = 0;
flags = irqsave();
/* Handle IN (device-to-host) requests. NOTE: If the class device is
* using the bi-directional EP0, then we assume that they intend the EP0
* IN functionality (EP0 SETUP OUT data receipt does not use requests).
*/
if (USB_ISEPIN(ep->eplog) || epno == EP0)
{
/* If the endpoint is stalled, then fail any attempts to write
* through the endpoint.
*/
if (privep->stalled)
{
sam_req_abort(privep, privreq, -EBUSY);
ulldbg("ERROR: stalled\n");
ret = -EPERM;
}
else
{
/* Add the new request to the request queue for the IN endpoint */
sam_req_enqueue(&privep->reqq, privreq);
usbtrace(TRACE_INREQQUEUED(epno), req->len);
/* If the IN endpoint is IDLE, then transfer the data now */
if (privep->epstate == UDPHS_EPSTATE_IDLE)
{
ret = sam_req_write(priv, privep);
}
}
}
/* Handle OUT (host-to-device) requests */
else
{
/* Add the new request to the request queue for the OUT endpoint */
sam_req_enqueue(&privep->reqq, privreq);
usbtrace(TRACE_OUTREQQUEUED(epno), req->len);
/* If the OUT endpoint IDLE, then setup the read */
if (privep->epstate == UDPHS_EPSTATE_IDLE)
{
ret = sam_req_read(priv, privep, 0);
}
}
irqrestore(flags);
return ret;
}
/****************************************************************************
* Name: sam_ep_cancel
****************************************************************************/
static int sam_ep_cancel(struct usbdev_ep_s *ep, struct usbdev_req_s *req)
{
struct sam_ep_s *privep = (struct sam_ep_s *)ep;
irqstate_t flags;
#ifdef CONFIG_DEBUG
if (!ep || !req)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return -EINVAL;
}
#endif
usbtrace(TRACE_EPCANCEL, USB_EPNO(ep->eplog));
flags = irqsave();
sam_req_cancel(privep, -EAGAIN);
irqrestore(flags);
return OK;
}
/****************************************************************************
* Name: sam_ep_stall
****************************************************************************/
static int sam_ep_stall(struct usbdev_ep_s *ep, bool resume)
{
struct sam_ep_s *privep;
struct sam_usbdev_s *priv;
uint8_t epno = USB_EPNO(ep->eplog);
uint32_t regval;
irqstate_t flags;
#ifdef CONFIG_DEBUG
if (!ep)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return -EINVAL;
}
#endif
/* Check that endpoint is in Idle state */
privep = (struct sam_ep_s *)ep;
DEBUGASSERT(/* privep->epstate == UDPHS_EPSTATE_IDLE && */ privep->dev);
priv = (struct sam_usbdev_s *)privep->dev;
epno = USB_EPNO(ep->eplog);
/* STALL or RESUME the endpoint */
flags = irqsave();
usbtrace(resume ? TRACE_EPRESUME : TRACE_EPSTALL, USB_EPNO(ep->eplog));
/* Handle the resume condition */
if (resume)
{
/* Check if the endpoint is halted */
if (privep->epstate == UDPHS_EPSTATE_STALLED)
{
usbtrace(TRACE_EPRESUME, epno);
privep->stalled = false;
/* Return endpoint to Idle state */
privep->epstate = UDPHS_EPSTATE_IDLE;
/* Clear FORCESTALL request
* REVISIT: Data sheet says to reset toggle to DATA0 only on OUT
* endpoints.
*/
sam_putreg(UDPHS_EPTCLRSTA_TOGGLESQ | UDPHS_EPTCLRSTA_FRCESTALL,
SAM_UDPHS_EPTCLRSTA(epno));
/* Reset endpoint FIFOs */
sam_putreg(UDPHS_EPTRST(epno), SAM_UDPHS_EPTRST);
/* Resuming any blocked data transfers on the endpoint */
if (epno == 0 || USB_ISEPIN(ep->eplog))
{
/* IN endpoint (or EP0). Restart any queued write requests */
(void)sam_req_write(priv, privep);
}
else
{
/* OUT endpoint. Restart any queued read requests. */
(void)sam_req_read(priv, privep, 0);
}
}
}
/* Handle the stall condition */
else
{
/* Check that endpoint is enabled and not already in Halt state */
if ((privep->epstate != UDPHS_EPSTATE_DISABLED) &&
(privep->epstate != UDPHS_EPSTATE_STALLED))
{
usbtrace(TRACE_EPSTALL, epno);
/* If this is an IN endpoint (or endpoint 0), then cancel all
* of the pending write requests.
*/
if (epno == 0 || USB_ISEPIN(ep->eplog))
{
sam_req_cancel(privep, -EPERM);
}
/* Otherwise, it is an OUT endpoint. Complete any read request
* currently in progress (it will get requeued immediately).
*/
else if (privep->epstate == UDPHS_EPSTATE_RECEIVING)
{
sam_req_complete(privep, -EPERM);
}
/* Put endpoint into stalled state */
privep->epstate = UDPHS_EPSTATE_STALLED;
privep->stalled = true;
sam_putreg(UDPHS_EPTSETSTA_FRCESTALL, SAM_UDPHS_EPTSETSTA(epno));
/* Disable endpoint/DMA interrupts. The not be re-enabled until
* the stall is cleared and the next transfer is started. It
* would, of course, be a bad idea to do this on EP0 since it is
* a SETUP request that is going to clear the STALL.
*/
if (epno != 0)
{
regval = sam_getreg(SAM_UDPHS_IEN);
regval &= ~(UDPHS_INT_DMA(epno) | UDPHS_INT_EPT(epno));
sam_putreg(regval, SAM_UDPHS_IEN);
}
}
}
irqrestore(flags);
return OK;
}
/****************************************************************************
* Device Controller Operations
****************************************************************************/
/****************************************************************************
* Name: sam_allocep
*
* Description:
* This is the allocep() method of the USB device driver interface
*
****************************************************************************/
static struct usbdev_ep_s *sam_allocep(struct usbdev_s *dev, uint8_t epno,
bool in, uint8_t eptype)
{
struct sam_usbdev_s *priv = (struct sam_usbdev_s *)dev;
struct sam_ep_s *privep = NULL;
uint16_t epset = SAM_EPSET_NOTEP0;
usbtrace(TRACE_DEVALLOCEP, (uint16_t)epno);
#ifdef CONFIG_DEBUG
if (!dev)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return NULL;
}
#endif
/* Ignore any direction bits in the logical address */
epno = USB_EPNO(epno);
/* A logical address of 0 means that any endpoint will do */
if (epno > 0)
{
/* Otherwise, we will return the endpoint structure only for the requested
* 'logical' endpoint. All of the other checks will still be performed.
*
* First, verify that the logical endpoint is in the range supported by
* by the hardware.
*/
if (epno >= SAM_UDPHS_NENDPOINTS)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEPNO), (uint16_t)epno);
return NULL;
}
/* Convert the logical address to a physical OUT endpoint address and
* remove all of the candidate endpoints from the bitset except for the
* the IN/OUT pair for this logical address.
*/
epset = SAM_EP_BIT(epno);
}
/* Check if the selected endpoint number is available */
privep = sam_ep_reserve(priv, epset);
if (!privep)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_EPRESERVE), (uint16_t)epset);
return NULL;
}
return &privep->ep;
}
/****************************************************************************
* Name: sam_freeep
*
* Description:
* This is the freeep() method of the USB device driver interface
*
****************************************************************************/
static void sam_freeep(struct usbdev_s *dev, struct usbdev_ep_s *ep)
{
struct sam_usbdev_s *priv;
struct sam_ep_s *privep;
#ifdef CONFIG_DEBUG
if (!dev || !ep)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return;
}
#endif
priv = (struct sam_usbdev_s *)dev;
privep = (struct sam_ep_s *)ep;
usbtrace(TRACE_DEVFREEEP, (uint16_t)USB_EPNO(ep->eplog));
if (priv && privep)
{
/* Mark the endpoint as available */
sam_ep_unreserve(priv, privep);
}
}
/****************************************************************************
* Name: sam_getframe
*
* Description:
* This is the getframe() method of the USB device driver interface
*
****************************************************************************/
static int sam_getframe(struct usbdev_s *dev)
{
uint32_t regval;
uint16_t frameno;
#ifdef CONFIG_DEBUG
if (!dev)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return -EINVAL;
}
#endif
/* Return the last frame number detected by the hardware */
regval = sam_getreg(SAM_UDPHS_FNUM);
frameno = (regval & UDPHS_FNUM_FRAMENUM_MASK) >> UDPHS_FNUM_FRAMENUM_SHIFT;
usbtrace(TRACE_DEVGETFRAME, frameno);
return frameno;
}
/****************************************************************************
* Name: sam_wakeup
*
* Description:
* This is the wakeup() method of the USB device driver interface
*
****************************************************************************/
static int sam_wakeup(struct usbdev_s *dev)
{
struct sam_usbdev_s *priv = (struct sam_usbdev_s *)dev;
irqstate_t flags;
uint32_t regval;
usbtrace(TRACE_DEVWAKEUP, 0);
#ifdef CONFIG_DEBUG
if (!dev)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return -EINVAL;
}
#endif
/* Resume normal operation */
flags = irqsave();
sam_resume(priv);
/* Activate a remote wakeup. Setting this bit forces an external interrupt
* on the UDPHS controller for Remote Wake UP purposes. An Upstream Resume
* is sent only after the UDPHS bus has been in SUSPEND state for at least 5
* ms.
*/
regval = sam_getreg(SAM_UDPHS_CTRL);
regval |= UDPHS_CTRL_REWAKEUP;
sam_putreg(regval, SAM_UDPHS_CTRL);
irqrestore(flags);
/* This bit is automatically cleared by hardware at the end of the Upstream
* Resume
*/
while ((sam_getreg(SAM_UDPHS_CTRL) & UDPHS_CTRL_REWAKEUP) != 0);
return OK;
}
/****************************************************************************
* Name: sam_selfpowered
*
* Description:
* This is the selfpowered() method of the USB device driver interface
*
****************************************************************************/
static int sam_selfpowered(struct usbdev_s *dev, bool selfpowered)
{
struct sam_usbdev_s *priv = (struct sam_usbdev_s *)dev;
usbtrace(TRACE_DEVSELFPOWERED, (uint16_t)selfpowered);
#ifdef CONFIG_DEBUG
if (!dev)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return -ENODEV;
}
#endif
priv->selfpowered = selfpowered;
return OK;
}
/****************************************************************************
* Name: sam_pullup
*
* Description:
* This is the pullup() method of the USB device driver interface
*
****************************************************************************/
static int sam_pullup(FAR struct usbdev_s *dev, bool enable)
{
struct sam_usbdev_s *priv = (struct sam_usbdev_s *)dev;
uint32_t regval;
usbtrace(TRACE_DEVPULLUP, (uint16_t)enable);
/* DETACH PULLD_DIS DP DM Condition
*
* 0 1 Pull High VBUS present
* Up Impedance
* 1 0 Pull Pull No VBUS
* Down Down
* 1 1 High High VBUS present +
* Impedance Imedpance Disconnect
*/
regval = sam_getreg(SAM_UDPHS_CTRL);
if (enable)
{
/* PULLD_DIS=1: No pull-Down on DP and DM */
regval |= UDPHS_CTRL_PULLDDIS;
sam_putreg(regval, SAM_UDPHS_CTRL);
/* DETACH=0: UDPHS is attached. Pulls up the DP line */
regval &= ~UDPHS_CTRL_DETACH;
sam_putreg(regval, SAM_UDPHS_CTRL);
}
else
{
/* DETACH=1: UDPHS is detached, UTMI transceiver is suspended. */
regval |= UDPHS_CTRL_DETACH;
sam_putreg(regval, SAM_UDPHS_CTRL);
/* PULLD_DIS=0: Pull-Down on DP & DM */
regval &= ~UDPHS_CTRL_PULLDDIS;
sam_putreg(regval, SAM_UDPHS_CTRL);
/* Device returns to the Powered state */
if (priv->devstate > UDPHS_DEVSTATE_POWERED)
{
priv->devstate = UDPHS_DEVSTATE_POWERED;
}
}
return OK;
}
/****************************************************************************
* Initialization/Reset
****************************************************************************/
/****************************************************************************
* Name: sam_reset
****************************************************************************/
static void sam_reset(struct sam_usbdev_s *priv)
{
uint32_t regval;
uint8_t epno;
/* Make sure that clocking is enabled to the UDPHS peripheral.
*
* NOTE: In the Atmel example code, they also enable USB clocking
* at this point (via the BIAS in the CKGR_UCKR register). In this
* implementation, that should not be necessary here because we
* never disable BIAS to begin with.
*/
sam_udphs_enableclk();
/* Tell the class driver that we are disconnected. The class driver
* should then accept any new configurations.
*/
CLASS_DISCONNECT(priv->driver, &priv->usbdev);
/* The device enters the Default state */
priv->devaddr = 0;
sam_setdevaddr(priv, 0);
priv->devstate = UDPHS_DEVSTATE_DEFAULT;
/* Reset and disable all endpoints other. Then re-configure EP0 */
sam_epset_reset(priv, SAM_EPSET_ALL);
sam_ep_configure_internal(&priv->eplist[EP0], &g_ep0desc);
/* Reset endpoint data structures */
for (epno = 0; epno < SAM_UDPHS_NENDPOINTS; epno++)
{
struct sam_ep_s *privep = &priv->eplist[epno];
/* Cancel any queued requests. Since they are canceled
* with status -ESHUTDOWN, then will not be requeued
* until the configuration is reset. NOTE: This should
* not be necessary... the CLASS_DISCONNECT above should
* result in the class implementation calling sam_ep_disable
* for each of its configured endpoints.
*/
sam_req_cancel(privep, -ESHUTDOWN);
/* Reset endpoint status */
privep->stalled = false;
privep->halted = false;
privep->zlpneeded = false;
privep->zlpsent = false;
}
/* Re-configure the USB controller in its initial, unconnected state */
priv->usbdev.speed = USB_SPEED_FULL;
/* Clear all pending interrupt status */
regval = UDPHS_INT_UPSTRRES | UDPHS_INT_ENDOFRSM | UDPHS_INT_WAKEUP |
UDPHS_INT_ENDRESET | UDPHS_INT_INTSOF | UDPHS_INT_MICROSOF |
UDPHS_INT_DETSUSPD;
sam_putreg(regval, SAM_UDPHS_CLRINT);
/* Enable normal operational interrupts (including endpoint 0) */
regval = UDPHS_INT_ENDOFRSM | UDPHS_INT_WAKEUP | UDPHS_INT_DETSUSPD |
UDPHS_INT_EPT0;
sam_putreg(regval, SAM_UDPHS_IEN);
sam_dumpep(priv, EP0);
}
/****************************************************************************
* Name: sam_hw_setup
****************************************************************************/
static void sam_hw_setup(struct sam_usbdev_s *priv)
{
uint32_t regval;
int i;
/* Paragraph 32.5.1, "Power Management". The UDPHS is not continuously
* clocked. For using the UDPHS, the programmer must first enable the
* UDPHS Clock in the Power Management Controller (PMC_PCER register).
* Then enable the PLL (PMC_UCKR register). Finally, enable BIAS in
* PMC_UCKR register. However, if the application does not require UDPHS
* operations, the UDPHS clock can be stopped when not needed and
* restarted later.
*
* Here, we set only the PCER. PLL configuration was performed in
* sam_clockconfig() earlier in the boot sequence.
*/
sam_udphs_enableclk();
/* Reset and disable endpoints */
sam_epset_reset(priv, SAM_EPSET_ALL);
/* Configure the pull-up on D+ and disconnect it */
regval = sam_getreg(SAM_UDPHS_CTRL);
regval |= UDPHS_CTRL_DETACH;
sam_putreg(regval, SAM_UDPHS_CTRL);
regval &= ~UDPHS_CTRL_PULLDDIS;
sam_putreg(regval, SAM_UDPHS_CTRL);
/* Reset the UDPHS block
*
* Paragraph 33.5.1. "One transceiver is shared with the USB High Speed
* Device (port A). The selection between Host Port A and USB Device is
* controlled by the UDPHS enable bit (EN_UDPHS) located in the UDPHS_CTRL
* control register.
*
* "In the case the port A is driven by the USB High Speed Device, the ...
* transceiver is automatically selected for Device operation once the
* USB High Speed Device is enabled."
*/
regval &= ~UDPHS_CTRL_ENUDPHS;
sam_putreg(regval, SAM_UDPHS_CTRL);
regval |= UDPHS_CTRL_ENUDPHS;
sam_putreg(regval, SAM_UDPHS_CTRL);
/* REVISIT: Per recommendations and sample code, USB clocking (as
* configured in the PMC CKGR_UCKR) is set up after reseting the UDHPS.
* However, that initialation has already been done in sam_clockconfig().
* Also, that clocking is shared with the UHPHS USB host logic; the
* device logica cannot autonomously control USB clocking.
*/
/* Initialize DMA channels */
for (i = 1; i <= SAM_UDPHS_NDMACHANNELS; i++)
{
/* Stop any DMA transfer */
sam_putreg(0, SAM_UDPHS_DMACONTROL(i));
/* Reset DMA channel (Buffer count and Control field) */
sam_putreg(UDPHS_DMACONTROL_LDNXTDSC, SAM_UDPHS_DMACONTROL(i));
/* Reset DMA channel */
sam_putreg(0, SAM_UDPHS_DMACONTROL(i));
/* Clear DMA channel status (read to clear) */
regval = sam_getreg(SAM_UDPHS_DMASTATUS(i));
sam_putreg(regval, SAM_UDPHS_DMACONTROL(i));
}
/* Initialize Endpoints */
for (i = 0; i < SAM_UDPHS_NENDPOINTS; i++)
{
/* Disable endpoint */
regval = UDPHS_EPTCTL_SHRTPCKT | UDPHS_EPTCTL_BUSYBANK |
UDPHS_EPTCTL_NAKOUT | UDPHS_EPTCTL_NAKIN |
UDPHS_EPTCTL_STALLSNT | UDPHS_EPTCTL_STALLSNT |
UDPHS_EPTCTL_TXRDY | UDPHS_EPTCTL_TXCOMPLT |
UDPHS_EPTCTL_RXRDYTXKL | UDPHS_EPTCTL_ERROVFLW |
UDPHS_EPTCTL_MDATARX | UDPHS_EPTCTL_DATAXRX |
UDPHS_EPTCTL_NYETDIS | UDPHS_EPTCTL_INTDISDMA |
UDPHS_EPTCTL_AUTOVALID | UDPHS_EPTCTL_EPTENABL;
sam_putreg(regval, SAM_UDPHS_EPTCTLDIS(i));
/* Clear endpoint status */
regval = UDPHS_EPTSTA_TOGGLESQ_MASK | UDPHS_EPTSTA_FRCESTALL |
UDPHS_EPTSTA_RXRDYTXKL | UDPHS_EPTSTA_TXCOMPLT |
UDPHS_EPTSTA_RXSETUP | UDPHS_EPTSTA_STALLSNT |
UDPHS_EPTSTA_NAKIN | UDPHS_EPTSTA_NAKOUT;
sam_putreg(regval, SAM_UDPHS_EPTCLRSTA(i));
/* Reset endpoint configuration */
sam_putreg(0, SAM_UDPHS_EPTCTLENB(i));
}
/* Normal mode (full speed not forced) */
sam_putreg(0, SAM_UDPHS_TST);
/* Disable all interrupts */
sam_putreg(0, SAM_UDPHS_IEN);
/* The Atmel sample code disables USB clocking here (via the PMC
* CKGR_UCKR). However, we cannot really do that here because that
* clocking is also needed by the UHPHS host.
*/
}
/****************************************************************************
* Name: sam_sw_setup
****************************************************************************/
static void sam_sw_setup(struct sam_usbdev_s *priv)
{
int epno;
#ifdef CONFIG_SAMA5_UDPHS_SCATTERGATHER
#ifndef CONFIG_SAMA5_EHCI_PREALLOCATE
int i;
/* Allocate a pool of free DMA transfer descriptors */
priv->dtdpool = (struct sam_dtd_s *)
kmemalign(16, CONFIG_SAMA5_UDPHS_NDTDS * sizeof(struct sam_dtd_s));
if (!priv->dtdpool)
{
udbg("ERROR: Failed to allocate the DMA transfer descriptor pool\n");
return NULL;
}
/* Initialize the list of free DMA transfer descriptors */
for (i = 0; i < CONFIG_SAMA5_UDPHS_NDTDS; i++)
{
/* Put the transfer descriptor in a free list */
sam_td_free(&priv->dtdpool[i]);
}
#else
/* Initialize the list of free DMA transfer descriptors */
DEBUGASSERT(((uintptr_t)&g_dtdpool & 15) == 0);
for (i = 0; i < CONFIG_SAMA5_UDPHS_NDTDS; i++)
{
/* Put the transfer descriptor in a free list */
sam_td_free(&g_dtdpool[i]);
}
#endif /* CONFIG_SAMA5_EHCI_PREALLOCATE */
#endif /* CONFIG_SAMA5_UDPHS_SCATTERGATHER */
/* Initialize the device state structure. NOTE: many fields
* have the initial value of zero and, hence, are not explicitly
* initialized here.
*/
memset(priv, 0, sizeof(struct sam_usbdev_s));
priv->usbdev.ops = &g_devops;
priv->usbdev.ep0 = &priv->eplist[EP0].ep;
priv->epavail = SAM_EPSET_ALL & ~SAM_EP_BIT(EP0);
priv->devstate = UDPHS_DEVSTATE_SUSPENDED;
priv->prevstate = UDPHS_DEVSTATE_POWERED;
/* Initialize the endpoint list */
for (epno = 0; epno < SAM_UDPHS_NENDPOINTS; epno++)
{
/* Set endpoint operations, reference to driver structure (not
* really necessary because there is only one controller), and
* the (physical) endpoint number which is just the index to the
* endpoint.
*/
priv->eplist[epno].ep.ops = &g_epops;
priv->eplist[epno].dev = priv;
priv->eplist[epno].ep.eplog = epno;
/* We will use a maxpacket size for supported for each endpoint */
priv->eplist[epno].ep.maxpacket = SAM_UDPHS_MAXPACKETSIZE(epno);
}
/* Select a smaller endpoint size for EP0 */
#if SAM_EP0MAXPACKET < SAM_MAXPACKET_SIZE
priv->eplist[EP0].ep.maxpacket = SAM_EP0MAXPACKET;
#endif
}
/****************************************************************************
* Name: sam_hw_shutdown
****************************************************************************/
static void sam_hw_shutdown(struct sam_usbdev_s *priv)
{
uint32_t regval;
priv->usbdev.speed = USB_SPEED_UNKNOWN;
/* Disable all interrupts */
sam_putreg(0, SAM_UDPHS_IEN);
/* Clear all pending interrupt status */
regval = UDPHS_INT_UPSTRRES | UDPHS_INT_ENDOFRSM | UDPHS_INT_WAKEUP |
UDPHS_INT_ENDRESET | UDPHS_INT_INTSOF | UDPHS_INT_MICROSOF |
UDPHS_INT_DETSUSPD;
sam_putreg(regval, SAM_UDPHS_CLRINT);
/* Disconnect the device / disable the pull-up */
sam_pullup(&priv->usbdev, false);
/* Disable clocking to the UDPHS peripheral */
sam_udphs_disableclk();
}
/****************************************************************************
* Name: sam_sw_shutdown
****************************************************************************/
static void sam_sw_shutdown(struct sam_usbdev_s *priv)
{
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_usbinitialize
* Description:
* Initialize the USB driver
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void up_usbinitialize(void)
{
/* For now there is only one USB controller, but we will always refer to
* it using a pointer to make any future ports to multiple USB controllers
* easier.
*/
struct sam_usbdev_s *priv = &g_udphs;
usbtrace(TRACE_DEVINIT, 0);
/* Software initialization */
sam_sw_setup(priv);
/* Power up and initialize USB controller. Interrupts from the UDPHS
* controller are initialized here, but will not be enabled at the AIC
* until the class driver is installed.
*/
sam_hw_setup(priv);
/* Attach USB controller interrupt handlers. The hardware will not be
* initialized and interrupts will not be enabled until the class device
* driver is bound. Getting the IRQs here only makes sure that we have
* them when we need them later.
*/
if (irq_attach(SAM_IRQ_UDPHS, sam_udphs_interrupt) != 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_IRQREGISTRATION),
(uint16_t)SAM_IRQ_UDPHS);
goto errout;
}
return;
errout:
up_usbuninitialize();
}
/****************************************************************************
* Name: up_usbuninitialize
* Description:
* Initialize the USB driver
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void up_usbuninitialize(void)
{
/* For now there is only one USB controller, but we will always refer to
* it using a pointer to make any future ports to multiple USB controllers
* easier.
*/
struct sam_usbdev_s *priv = &g_udphs;
irqstate_t flags;
flags = irqsave();
usbtrace(TRACE_DEVUNINIT, 0);
/* Disable and detach the UDPHS IRQ */
up_disable_irq(SAM_IRQ_UDPHS);
irq_detach(SAM_IRQ_UDPHS);
if (priv->driver)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_DRIVERREGISTERED), 0);
usbdev_unregister(priv->driver);
}
/* Put the hardware in an inactive state */
sam_hw_shutdown(priv);
sam_sw_shutdown(priv);
irqrestore(flags);
}
/****************************************************************************
* Name: usbdev_register
*
* Description:
* Register a USB device class driver. The class driver's bind() method will be
* called to bind it to a USB device driver.
*
****************************************************************************/
int usbdev_register(struct usbdevclass_driver_s *driver)
{
/* For now there is only one USB controller, but we will always refer to
* it using a pointer to make any future ports to multiple USB controllers
* easier.
*/
struct sam_usbdev_s *priv = &g_udphs;
int ret;
usbtrace(TRACE_DEVREGISTER, 0);
#ifdef CONFIG_DEBUG
if (!driver || !driver->ops->bind || !driver->ops->unbind ||
!driver->ops->disconnect || !driver->ops->setup)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return -EINVAL;
}
if (priv->driver)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_DRIVER), 0);
return -EBUSY;
}
#endif
/* First hook up the driver */
priv->driver = driver;
/* Then bind the class driver */
ret = CLASS_BIND(driver, &priv->usbdev);
if (ret)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BINDFAILED), (uint16_t)-ret);
priv->driver = NULL;
}
else
{
/* Enable USB controller interrupts at the AIC.
*
* NOTE that interrupts and clocking are left disabled in the UDPHS
* peripheral. The ENDRESET interrupt will automatically be enabled
* when the bus reset occurs. The normal operating configuration will
* be established at that time.
*/
up_enable_irq(SAM_IRQ_UDPHS);
/* Enable pull-up to connect the device. The host should enumerate us
* some time after this. The next thing we expect the the ENDRESET
* interrupt.
*/
sam_pullup(&priv->usbdev, true);
priv->usbdev.speed = USB_SPEED_FULL;
}
return ret;
}
/****************************************************************************
* Name: usbdev_unregister
*
* Description:
* Un-register usbdev class driver. If the USB device is connected to a
* USB host, it will first disconnect(). The driver is also requested to
* unbind() and clean up any device state, before this procedure finally
* returns.
*
****************************************************************************/
int usbdev_unregister(struct usbdevclass_driver_s *driver)
{
/* For now there is only one USB controller, but we will always refer to
* it using a pointer to make any future ports to multiple USB controllers
* easier.
*/
struct sam_usbdev_s *priv = &g_udphs;
irqstate_t flags;
usbtrace(TRACE_DEVUNREGISTER, 0);
#ifdef CONFIG_DEBUG
if (driver != priv->driver)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDPARMS), 0);
return -EINVAL;
}
#endif
/* Reset the hardware and cancel all requests. All requests must be
* canceled while the class driver is still bound.
*/
flags = irqsave();
/* Unbind the class driver */
CLASS_UNBIND(driver, &priv->usbdev);
/* Disable USB controller interrupts (but keep them attached) */
up_disable_irq(SAM_IRQ_UDPHS);
/* Put the hardware in an inactive state. Then bring the hardware back up
* in the initial state. This is essentially the same state as we were
* in when up_usbinitialize() was first called.
*/
sam_hw_shutdown(priv);
sam_sw_shutdown(priv);
sam_sw_setup(priv);
sam_hw_setup(priv);
/* Unhook the driver */
priv->driver = NULL;
irqrestore(flags);
return OK;
}
#endif /* CONFIG_USBDEV && CONFIG_SAMA5_UDPHS */
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