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nuttx/arch/arm/src/efm32/efm32_usbhost.c

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EFM32: Port USB device and host drivers from STM32. Still does not compile
2014-11-04 17:14:04 +01:00
/*******************************************************************************
* arch/arm/src/efm32/efm32_otgfshost.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Authors: Gregory Nutt <gnutt@nuttx.org>
*
* 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 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 <unistd.h>
#include <semaphore.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include <nuttx/clock.h>
#include <nuttx/usb/usb.h>
#include <nuttx/usb/usbhost.h>
#include <nuttx/usb/usbhost_trace.h>
#include <arch/irq.h>
#include "chip.h" /* Includes default GPIO settings */
#include <arch/board/board.h> /* May redefine GPIO settings */
#include "up_arch.h"
#include "up_internal.h"
#include "efm32_usb.h"
#if defined(CONFIG_USBHOST) && defined(CONFIG_EFM32_OTGFS)
/*******************************************************************************
* Pre-processor Definitions
*******************************************************************************/
/* Configuration ***************************************************************/
/*
* EFM32 USB OTG FS Host Driver Support
*
* Pre-requisites
*
* CONFIG_USBHOST - Enable general USB host support
* CONFIG_EFM32_OTGFS - Enable the EFM32 USB OTG FS block
*
* Options:
*
* CONFIG_EFM32_OTGFS_RXFIFO_SIZE - Size of the RX FIFO in 32-bit words.
* Default 128 (512 bytes)
* CONFIG_EFM32_OTGFS_NPTXFIFO_SIZE - Size of the non-periodic Tx FIFO
* in 32-bit words. Default 96 (384 bytes)
* CONFIG_EFM32_OTGFS_PTXFIFO_SIZE - Size of the periodic Tx FIFO in 32-bit
* words. Default 96 (384 bytes)
* CONFIG_EFM32_OTGFS_DESCSIZE - Maximum size of a descriptor. Default: 128
* CONFIG_EFM32_OTGFS_SOFINTR - Enable SOF interrupts. Why would you ever
* want to do that?
* CONFIG_EFM32_USBHOST_REGDEBUG - Enable very low-level register access
* debug. Depends on CONFIG_DEBUG.
* CONFIG_EFM32_USBHOST_PKTDUMP - Dump all incoming and outgoing USB
* packets. Depends on CONFIG_DEBUG.
*/
/* Pre-requisites (partial) */
#ifndef CONFIG_EFM32_SYSCFG
# error "CONFIG_EFM32_SYSCFG is required"
#endif
/* Default RxFIFO size */
#ifndef CONFIG_EFM32_OTGFS_RXFIFO_SIZE
# define CONFIG_EFM32_OTGFS_RXFIFO_SIZE 128
#endif
/* Default host non-periodic Tx FIFO size */
#ifndef CONFIG_EFM32_OTGFS_NPTXFIFO_SIZE
# define CONFIG_EFM32_OTGFS_NPTXFIFO_SIZE 96
#endif
/* Default host periodic Tx fifo size register */
#ifndef CONFIG_EFM32_OTGFS_PTXFIFO_SIZE
# define CONFIG_EFM32_OTGFS_PTXFIFO_SIZE 96
#endif
/* Maximum size of a descriptor */
#ifndef CONFIG_EFM32_OTGFS_DESCSIZE
# define CONFIG_EFM32_OTGFS_DESCSIZE 128
#endif
/* Register/packet debug depends on CONFIG_DEBUG */
#ifndef CONFIG_DEBUG
# undef CONFIG_EFM32_USBHOST_REGDEBUG
# undef CONFIG_EFM32_USBHOST_PKTDUMP
#endif
/* HCD Setup *******************************************************************/
/* Hardware capabilities */
#define EFM32_NHOST_CHANNELS 8 /* Number of host channels */
#define EFM32_MAX_PACKET_SIZE 64 /* Full speed max packet size */
#define EFM32_EP0_DEF_PACKET_SIZE 8 /* EP0 default packet size */
#define EFM32_EP0_MAX_PACKET_SIZE 64 /* EP0 FS max packet size */
#define EFM32_MAX_TX_FIFOS 15 /* Max number of TX FIFOs */
#define EFM32_MAX_PKTCOUNT 256 /* Max packet count */
#define EFM32_RETRY_COUNT 3 /* Number of ctrl transfer retries */
#define EFM32_DEF_DEVADDR 0 /* Default device address */
/* Delays **********************************************************************/
#define EFM32_READY_DELAY 200000 /* In loop counts */
#define EFM32_FLUSH_DELAY 200000 /* In loop counts */
#define EFM32_SETUP_DELAY SEC2TICK(5) /* 5 seconds in system ticks */
#define EFM32_DATANAK_DELAY SEC2TICK(5) /* 5 seconds in system ticks */
/* Ever-present MIN/MAX macros */
#ifndef MIN
# define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef MAX
# define MAX(a, b) (((a) > (b)) ? (a) : (b))
#endif
/*******************************************************************************
* Private Types
*******************************************************************************/
/* The following enumeration represents the various states of the USB host
* state machine (for debug purposes only)
*/
enum efm32_smstate_e
{
SMSTATE_DETACHED = 0, /* Not attached to a device */
SMSTATE_ATTACHED, /* Attached to a device */
SMSTATE_ENUM, /* Attached, enumerating */
SMSTATE_CLASS_BOUND, /* Enumeration complete, class bound */
};
/* This enumeration provides the reason for the channel halt. */
enum efm32_chreason_e
{
CHREASON_IDLE = 0, /* Inactive (initial state) */
CHREASON_FREED, /* Channel is no longer in use */
CHREASON_XFRC, /* Transfer complete */
CHREASON_NAK, /* NAK received */
CHREASON_NYET, /* NotYet received */
CHREASON_STALL, /* Endpoint stalled */
CHREASON_TXERR, /* Transfer error received */
CHREASON_DTERR, /* Data toggle error received */
CHREASON_FRMOR /* Frame overrun */
};
/* This structure retains the state of one host channel. NOTE: Since there
* is only one channel operation active at a time, some of the fields in
* in the structure could be moved in struct efm32_ubhost_s to achieve
* some memory savings.
*/
struct efm32_chan_s
{
sem_t waitsem; /* Channel wait semaphore */
volatile uint8_t result; /* The result of the transfer */
volatile uint8_t chreason; /* Channel halt reason. See enum efm32_chreason_e */
uint8_t epno; /* Device endpoint number (0-127) */
uint8_t eptype; /* See OTGFS_EPTYPE_* definitions */
uint8_t pid; /* Data PID */
uint8_t npackets; /* Number of packets (for data toggle) */
bool inuse; /* True: This channel is "in use" */
volatile bool indata1; /* IN data toggle. True: DATA01 (Bulk and INTR only) */
volatile bool outdata1; /* OUT data toggle. True: DATA01 */
bool in; /* True: IN endpoint */
volatile bool waiter; /* True: Thread is waiting for a channel event */
uint16_t maxpacket; /* Max packet size */
volatile uint16_t buflen; /* Buffer length (remaining) */
volatile uint16_t inflight; /* Number of Tx bytes "in-flight" */
FAR uint8_t *buffer; /* Transfer buffer pointer */
};
/* This structure retains the state of the USB host controller */
struct efm32_usbhost_s
{
/* Common device fields. This must be the first thing defined in the
* structure so that it is possible to simply cast from struct usbhost_s
* to structefm32_usbhost_s.
*/
struct usbhost_driver_s drvr;
/* The bound device class driver */
struct usbhost_class_s *class;
/* Overall driver status */
volatile uint8_t smstate; /* The state of the USB host state machine */
uint8_t devaddr; /* Device address */
uint8_t ep0in; /* EP0 IN control channel index */
uint8_t ep0out; /* EP0 OUT control channel index */
uint8_t ep0size; /* EP0 max packet size */
uint8_t chidx; /* ID of channel waiting for space in Tx FIFO */
bool lowspeed; /* True: low speed device */
volatile bool connected; /* Connected to device */
volatile bool eventwait; /* True: Thread is waiting for a port event */
sem_t exclsem; /* Support mutually exclusive access */
sem_t eventsem; /* Semaphore to wait for a port event */
/* The state of each host channel */
struct efm32_chan_s chan[EFM32_MAX_TX_FIFOS];
};
/*******************************************************************************
* Private Function Prototypes
*******************************************************************************/
/* Register operations ********************************************************/
#ifdef CONFIG_EFM32_USBHOST_REGDEBUG
static void efm32_printreg(uint32_t addr, uint32_t val, bool iswrite);
static void efm32_checkreg(uint32_t addr, uint32_t val, bool iswrite);
static uint32_t efm32_getreg(uint32_t addr);
static void efm32_putreg(uint32_t addr, uint32_t value);
#else
# define efm32_getreg(addr) getreg32(addr)
# define efm32_putreg(addr,val) putreg32(val,addr)
#endif
static inline void efm32_modifyreg(uint32_t addr, uint32_t clrbits,
uint32_t setbits);
#ifdef CONFIG_EFM32_USBHOST_PKTDUMP
# define efm32_pktdump(m,b,n) lib_dumpbuffer(m,b,n)
#else
# define efm32_pktdump(m,b,n)
#endif
/* Semaphores ******************************************************************/
static void efm32_takesem(sem_t *sem);
#define efm32_givesem(s) sem_post(s);
/* Byte stream access helper functions *****************************************/
static inline uint16_t efm32_getle16(const uint8_t *val);
/* Channel management **********************************************************/
static int efm32_chan_alloc(FAR struct efm32_usbhost_s *priv);
static inline void efm32_chan_free(FAR struct efm32_usbhost_s *priv, int chidx);
static inline void efm32_chan_freeall(FAR struct efm32_usbhost_s *priv);
static void efm32_chan_configure(FAR struct efm32_usbhost_s *priv, int chidx);
static void efm32_chan_halt(FAR struct efm32_usbhost_s *priv, int chidx,
enum efm32_chreason_e chreason);
static int efm32_chan_waitsetup(FAR struct efm32_usbhost_s *priv,
FAR struct efm32_chan_s *chan);
static int efm32_chan_wait(FAR struct efm32_usbhost_s *priv,
FAR struct efm32_chan_s *chan);
static void efm32_chan_wakeup(FAR struct efm32_usbhost_s *priv,
FAR struct efm32_chan_s *chan);
/* Control/data transfer logic *************************************************/
static void efm32_transfer_start(FAR struct efm32_usbhost_s *priv, int chidx);
#if 0 /* Not used */
static inline uint16_t efm32_getframe(void);
#endif
static int efm32_ctrl_sendsetup(FAR struct efm32_usbhost_s *priv,
FAR const struct usb_ctrlreq_s *req);
static int efm32_ctrl_senddata(FAR struct efm32_usbhost_s *priv,
FAR uint8_t *buffer, unsigned int buflen);
static int efm32_ctrl_recvdata(FAR struct efm32_usbhost_s *priv,
FAR uint8_t *buffer, unsigned int buflen);
static int efm32_in_transfer(FAR struct efm32_usbhost_s *priv, int chidx,
FAR uint8_t *buffer, size_t buflen);
static int efm32_out_transfer(FAR struct efm32_usbhost_s *priv, int chidx,
FAR uint8_t *buffer, size_t buflen);
/* Interrupt handling **********************************************************/
/* Lower level interrupt handlers */
static void efm32_gint_wrpacket(FAR struct efm32_usbhost_s *priv,
FAR uint8_t *buffer, int chidx, int buflen);
static inline void efm32_gint_hcinisr(FAR struct efm32_usbhost_s *priv,
int chidx);
static inline void efm32_gint_hcoutisr(FAR struct efm32_usbhost_s *priv,
int chidx);
static void efm32_gint_connected(FAR struct efm32_usbhost_s *priv);
static void efm32_gint_disconnected(FAR struct efm32_usbhost_s *priv);
/* Second level interrupt handlers */
#ifdef CONFIG_EFM32_OTGFS_SOFINTR
static inline void efm32_gint_sofisr(FAR struct efm32_usbhost_s *priv);
#endif
static inline void efm32_gint_rxflvlisr(FAR struct efm32_usbhost_s *priv);
static inline void efm32_gint_nptxfeisr(FAR struct efm32_usbhost_s *priv);
static inline void efm32_gint_ptxfeisr(FAR struct efm32_usbhost_s *priv);
static inline void efm32_gint_hcisr(FAR struct efm32_usbhost_s *priv);
static inline void efm32_gint_hprtisr(FAR struct efm32_usbhost_s *priv);
static inline void efm32_gint_discisr(FAR struct efm32_usbhost_s *priv);
static inline void efm32_gint_ipxfrisr(FAR struct efm32_usbhost_s *priv);
/* First level, global interrupt handler */
static int efm32_gint_isr(int irq, FAR void *context);
/* Interrupt controls */
static void efm32_gint_enable(void);
static void efm32_gint_disable(void);
static inline void efm32_hostinit_enable(void);
static void efm32_txfe_enable(FAR struct efm32_usbhost_s *priv, int chidx);
/* USB host controller operations **********************************************/
static int efm32_wait(FAR struct usbhost_connection_s *conn,
FAR const bool *connected);
static int efm32_enumerate(FAR struct usbhost_connection_s *conn, int rhpndx);
static int efm32_ep0configure(FAR struct usbhost_driver_s *drvr, uint8_t funcaddr,
uint16_t maxpacketsize);
static int efm32_getdevinfo(FAR struct usbhost_driver_s *drvr,
FAR struct usbhost_devinfo_s *devinfo);
static int efm32_epalloc(FAR struct usbhost_driver_s *drvr,
FAR const FAR struct usbhost_epdesc_s *epdesc,
FAR usbhost_ep_t *ep);
static int efm32_epfree(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep);
static int efm32_alloc(FAR struct usbhost_driver_s *drvr,
FAR uint8_t **buffer, FAR size_t *maxlen);
static int efm32_free(FAR struct usbhost_driver_s *drvr, FAR uint8_t *buffer);
static int efm32_ioalloc(FAR struct usbhost_driver_s *drvr,
FAR uint8_t **buffer, size_t buflen);
static int efm32_iofree(FAR struct usbhost_driver_s *drvr, FAR uint8_t *buffer);
static int efm32_ctrlin(FAR struct usbhost_driver_s *drvr,
FAR const struct usb_ctrlreq_s *req,
FAR uint8_t *buffer);
static int efm32_ctrlout(FAR struct usbhost_driver_s *drvr,
FAR const struct usb_ctrlreq_s *req,
FAR const uint8_t *buffer);
static int efm32_transfer(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep,
FAR uint8_t *buffer, size_t buflen);
static void efm32_disconnect(FAR struct usbhost_driver_s *drvr);
/* Initialization **************************************************************/
static void efm32_portreset(FAR struct efm32_usbhost_s *priv);
static void efm32_flush_txfifos(uint32_t txfnum);
static void efm32_flush_rxfifo(void);
static void efm32_vbusdrive(FAR struct efm32_usbhost_s *priv, bool state);
static void efm32_host_initialize(FAR struct efm32_usbhost_s *priv);
static inline void efm32_sw_initialize(FAR struct efm32_usbhost_s *priv);
static inline int efm32_hw_initialize(FAR struct efm32_usbhost_s *priv);
/*******************************************************************************
* Private Data
*******************************************************************************/
/* In this driver implementation, support is provided for only a single a single
* USB device. All status information can be simply retained in a single global
* instance.
*/
static struct efm32_usbhost_s g_usbhost =
{
.drvr =
{
.ep0configure = efm32_ep0configure,
.getdevinfo = efm32_getdevinfo,
.epalloc = efm32_epalloc,
.epfree = efm32_epfree,
.alloc = efm32_alloc,
.free = efm32_free,
.ioalloc = efm32_ioalloc,
.iofree = efm32_iofree,
.ctrlin = efm32_ctrlin,
.ctrlout = efm32_ctrlout,
.transfer = efm32_transfer,
.disconnect = efm32_disconnect,
},
.class = NULL,
};
/* This is the connection/enumeration interface */
static struct usbhost_connection_s g_usbconn =
{
.wait = efm32_wait,
.enumerate = efm32_enumerate,
};
/*******************************************************************************
* Public Data
*******************************************************************************/
/*******************************************************************************
* Private Functions
*******************************************************************************/
/*******************************************************************************
* Name: efm32_printreg
*
* Description:
* Print the contents of an EFM32xx register operation
*
*******************************************************************************/
#ifdef CONFIG_EFM32_USBHOST_REGDEBUG
static void efm32_printreg(uint32_t addr, uint32_t val, bool iswrite)
{
lldbg("%08x%s%08x\n", addr, iswrite ? "<-" : "->", val);
}
#endif
/*******************************************************************************
* Name: efm32_checkreg
*
* Description:
* Get the contents of an EFM32 register
*
*******************************************************************************/
#ifdef CONFIG_EFM32_USBHOST_REGDEBUG
static void efm32_checkreg(uint32_t addr, uint32_t val, bool iswrite)
{
static uint32_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 (addr == prevaddr && val == 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 */
efm32_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 = addr;
preval = val;
count = 0;
prevwrite = iswrite;
/* Show the new regisgter access */
efm32_printreg(addr, val, iswrite);
}
}
#endif
/*******************************************************************************
* Name: efm32_getreg
*
* Description:
* Get the contents of an EFM32 register
*
*******************************************************************************/
#ifdef CONFIG_EFM32_USBHOST_REGDEBUG
static uint32_t efm32_getreg(uint32_t addr)
{
/* Read the value from the register */
uint32_t val = getreg32(addr);
/* Check if we need to print this value */
efm32_checkreg(addr, val, false);
return val;
}
#endif
/*******************************************************************************
* Name: efm32_putreg
*
* Description:
* Set the contents of an EFM32 register to a value
*
*******************************************************************************/
#ifdef CONFIG_EFM32_USBHOST_REGDEBUG
static void efm32_putreg(uint32_t addr, uint32_t val)
{
/* Check if we need to print this value */
efm32_checkreg(addr, val, true);
/* Write the value */
putreg32(val, addr);
}
#endif
/*******************************************************************************
* Name: efm32_modifyreg
*
* Description:
* Modify selected bits of an EFM32 register.
*
*******************************************************************************/
static inline void efm32_modifyreg(uint32_t addr, uint32_t clrbits, uint32_t setbits)
{
efm32_putreg(addr, (((efm32_getreg(addr)) & ~clrbits) | setbits));
}
/****************************************************************************
* Name: efm32_takesem
*
* Description:
* This is just a wrapper to handle the annoying behavior of semaphore
* waits that return due to the receipt of a signal.
*
*******************************************************************************/
static void efm32_takesem(sem_t *sem)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(sem) != 0)
{
/* The only case that an error should occr here is if the wait was
* awakened by a signal.
*/
ASSERT(errno == EINTR);
}
}
/****************************************************************************
* Name: efm32_getle16
*
* Description:
* Get a (possibly unaligned) 16-bit little endian value.
*
*******************************************************************************/
static inline uint16_t efm32_getle16(const uint8_t *val)
{
return (uint16_t)val[1] << 8 | (uint16_t)val[0];
}
/*******************************************************************************
* Name: efm32_chan_alloc
*
* Description:
* Allocate a channel.
*
*******************************************************************************/
static int efm32_chan_alloc(FAR struct efm32_usbhost_s *priv)
{
int chidx;
/* Search the table of channels */
for (chidx = 0; chidx < EFM32_NHOST_CHANNELS; chidx++)
{
/* Is this channel available? */
if (!priv->chan[chidx].inuse)
{
/* Yes... make it "in use" and return the index */
priv->chan[chidx].inuse = true;
return chidx;
}
}
/* All of the channels are "in-use" */
return -EBUSY;
}
/*******************************************************************************
* Name: efm32_chan_free
*
* Description:
* Free a previoiusly allocated channel.
*
*******************************************************************************/
static void efm32_chan_free(FAR struct efm32_usbhost_s *priv, int chidx)
{
DEBUGASSERT((unsigned)chidx < EFM32_NHOST_CHANNELS);
/* Halt the channel */
efm32_chan_halt(priv, chidx, CHREASON_FREED);
/* Mark the channel available */
priv->chan[chidx].inuse = false;
}
/*******************************************************************************
* Name: efm32_chan_freeall
*
* Description:
* Free all channels.
*
*******************************************************************************/
static inline void efm32_chan_freeall(FAR struct efm32_usbhost_s *priv)
{
uint8_t chidx;
/* Free all host channels */
for (chidx = 2; chidx < EFM32_NHOST_CHANNELS; chidx ++)
{
efm32_chan_free(priv, chidx);
}
}
/*******************************************************************************
* Name: efm32_chan_configure
*
* Description:
* Configure or re-configure a host channel. Host channels are configured
* when endpoint is allocated and EP0 (only) is re-configured with the
* max packet size or device address changes.
*
*******************************************************************************/
static void efm32_chan_configure(FAR struct efm32_usbhost_s *priv, int chidx)
{
uint32_t regval;
/* Clear any old pending interrupts for this host channel. */
efm32_putreg(EFM32_USB_HCINT(chidx), 0xffffffff);
/* Enable channel interrupts required for transfers on this channel. */
regval = 0;
switch (priv->chan[chidx].eptype)
{
case OTGFS_EPTYPE_CTRL:
case OTGFS_EPTYPE_BULK:
{
#ifdef HAVE_USBHOST_TRACE_VERBOSE
uint16_t intrace;
uint16_t outtrace;
/* Determine the definitive trace ID to use below */
if (priv->chan[chidx].eptype == OTGFS_EPTYPE_CTRL)
{
intrace = OTGFS_VTRACE2_CHANCONF_CTRL_IN;
outtrace = OTGFS_VTRACE2_CHANCONF_CTRL_OUT;
}
else
{
intrace = OTGFS_VTRACE2_CHANCONF_BULK_IN;
outtrace = OTGFS_VTRACE2_CHANCONF_BULK_OUT;
}
#endif
/* Interrupts required for CTRL and BULK endpoints */
regval |= (OTGFS_HCINT_XFRC | OTGFS_HCINT_STALL | OTGFS_HCINT_NAK |
OTGFS_HCINT_TXERR | OTGFS_HCINT_DTERR);
/* Additional setting for IN/OUT endpoints */
if (priv->chan[chidx].in)
{
usbhost_vtrace2(intrace, chidx, priv->chan[chidx].epno);
regval |= OTGFS_HCINT_BBERR;
}
else
{
usbhost_vtrace2(outtrace, chidx, priv->chan[chidx].epno);
regval |= OTGFS_HCINT_NYET;
}
}
break;
case OTGFS_EPTYPE_INTR:
{
/* Interrupts required for INTR endpoints */
regval |= (OTGFS_HCINT_XFRC | OTGFS_HCINT_STALL | OTGFS_HCINT_NAK |
OTGFS_HCINT_TXERR | OTGFS_HCINT_FRMOR | OTGFS_HCINT_DTERR);
/* Additional setting for IN endpoints */
if (priv->chan[chidx].in)
{
usbhost_vtrace2(OTGFS_VTRACE2_CHANCONF_INTR_IN, chidx,
priv->chan[chidx].epno);
regval |= OTGFS_HCINT_BBERR;
}
#ifdef HAVE_USBHOST_TRACE_VERBOSE
else
{
usbhost_vtrace2(OTGFS_VTRACE2_CHANCONF_INTR_OUT, chidx,
priv->chan[chidx].epno);
}
#endif
}
break;
case OTGFS_EPTYPE_ISOC:
{
/* Interrupts required for ISOC endpoints */
regval |= (OTGFS_HCINT_XFRC | OTGFS_HCINT_ACK | OTGFS_HCINT_FRMOR);
/* Additional setting for IN endpoints */
if (priv->chan[chidx].in)
{
usbhost_vtrace2(OTGFS_VTRACE2_CHANCONF_ISOC_IN, chidx,
priv->chan[chidx].epno);
regval |= (OTGFS_HCINT_TXERR | OTGFS_HCINT_BBERR);
}
#ifdef HAVE_USBHOST_TRACE_VERBOSE
else
{
usbhost_vtrace2(OTGFS_VTRACE2_CHANCONF_ISOC_OUT, chidx,
priv->chan[chidx].epno);
}
#endif
}
break;
}
efm32_putreg(EFM32_USB_HCINTMSK(chidx), regval);
/* Enable the top level host channel interrupt. */
efm32_modifyreg(EFM32_USB_HAINTMSK, 0, OTGFS_HAINT(chidx));
/* Make sure host channel interrupts are enabled. */
efm32_modifyreg(EFM32_USB_GINTMSK, 0, USB_GINT_HC);
/* Program the HCCHAR register */
regval = ((uint32_t)priv->chan[chidx].maxpacket << _OTGFS_HCCHAR_MPSIZ_SHIFT) |
((uint32_t)priv->chan[chidx].epno << _OTGFS_HCCHAR_EPNUM_SHIFT) |
((uint32_t)priv->chan[chidx].eptype << _OTGFS_HCCHAR_EPTYP_SHIFT) |
((uint32_t)priv->devaddr << _OTGFS_HCCHAR_DAD_SHIFT);
/* Special case settings for low speed devices */
if (priv->lowspeed)
{
regval |= OTGFS_HCCHAR_LSDEV;
}
/* Special case settings for IN endpoints */
if (priv->chan[chidx].in)
{
regval |= OTGFS_HCCHAR_EPDIR_IN;
}
/* Special case settings for INTR endpoints */
if (priv->chan[chidx].eptype == OTGFS_EPTYPE_INTR)
{
regval |= OTGFS_HCCHAR_ODDFRM;
}
/* Write the channel configuration */
efm32_putreg(EFM32_USB_HCCHAR(chidx), regval);
}
/*******************************************************************************
* Name: efm32_chan_halt
*
* Description:
* Halt the channel associated with 'chidx' by setting the CHannel DISable
* (CHDIS) bit in in the HCCHAR register.
*
*******************************************************************************/
static void efm32_chan_halt(FAR struct efm32_usbhost_s *priv, int chidx,
enum efm32_chreason_e chreason)
{
uint32_t hcchar;
uint32_t intmsk;
uint32_t eptype;
unsigned int avail;
/* Save the reason for the halt. We need this in the channel halt interrrupt
* handling logic to know what to do next.
*/
usbhost_vtrace2(OTGFS_VTRACE2_CHANHALT, chidx, chreason);
priv->chan[chidx].chreason = (uint8_t)chreason;
/* "The application can disable any channel by programming the OTG_FS_HCCHARx
* register with the CHDIS and CHENA bits set to 1. This enables the OTG_FS
* host to flush the posted requests (if any) and generates a channel halted
* interrupt. The application must wait for the CHH interrupt in OTG_FS_HCINTx
* before reallocating the channel for other transactions. The OTG_FS host
* does not interrupt the transaction that has already been started on the
* USB."
*/
hcchar = efm32_getreg(EFM32_USB_HCCHAR(chidx));
hcchar |= (OTGFS_HCCHAR_CHDIS | OTGFS_HCCHAR_CHENA);
/* Get the endpoint type from the HCCHAR register */
eptype = hcchar & _OTGFS_HCCHAR_EPTYP_MASK;
/* Check for space in the Tx FIFO to issue the halt.
*
* "Before disabling a channel, the application must ensure that there is at
* least one free space available in the non-periodic request queue (when
* disabling a non-periodic channel) or the periodic request queue (when
* disabling a periodic channel). The application can simply flush the
* posted requests when the Request queue is full (before disabling the
* channel), by programming the OTG_FS_HCCHARx register with the CHDIS bit
* set to 1, and the CHENA bit cleared to 0.
*/
if (eptype == OTGFS_HCCHAR_EPTYP_CTRL || eptype == OTGFS_HCCHAR_EPTYP_BULK)
{
/* Get the number of words available in the non-periodic Tx FIFO. */
avail = efm32_getreg(EFM32_USB_HNPTXSTS) & _OTGFS_HNPTXSTS_NPTXFSAV_MASK;
}
else /* if (eptype == OTGFS_HCCHAR_EPTYP_ISOC || eptype == OTGFS_HCCHAR_EPTYP_INTR) */
{
/* Get the number of words available in the non-periodic Tx FIFO. */
avail = efm32_getreg(EFM32_USB_HPTXSTS) & _OTGFS_HPTXSTS_PTXFSAVL_MASK;
}
/* Check if there is any space available in the Tx FIFO. */
if (avail == 0)
{
/* The Tx FIFO is full... disable the channel to flush the requests */
hcchar &= ~OTGFS_HCCHAR_CHENA;
}
/* Unmask the CHannel Halted (CHH) interrupt */
intmsk = efm32_getreg(EFM32_USB_HCINTMSK(chidx));
intmsk |= OTGFS_HCINT_CHH;
efm32_putreg(EFM32_USB_HCINTMSK(chidx), intmsk);
/* Halt the channel by setting CHDIS (and maybe CHENA) in the HCCHAR */
efm32_putreg(EFM32_USB_HCCHAR(chidx), hcchar);
}
/*******************************************************************************
* Name: efm32_chan_waitsetup
*
* Description:
* Set the request for the transfer complete event well BEFORE enabling the
* transfer (as soon as we are absolutely committed to the to avoid transfer).
* We do this to minimize race conditions. This logic would have to be expanded
* if we want to have more than one packet in flight at a time!
*
* Assumptions:
* Called from a normal thread context BEFORE the transfer has been started.
*
*******************************************************************************/
static int efm32_chan_waitsetup(FAR struct efm32_usbhost_s *priv,
FAR struct efm32_chan_s *chan)
{
irqstate_t flags = irqsave();
int ret = -ENODEV;
/* Is the device still connected? */
if (priv->connected)
{
/* Yes.. then set waiter to indicate that we expect to be informed when
* either (1) the device is disconnected, or (2) the transfer completed.
*/
chan->waiter = true;
ret = OK;
}
irqrestore(flags);
return ret;
}
/*******************************************************************************
* Name: efm32_chan_wait
*
* Description:
* Wait for a transfer on a channel to complete.
*
* Assumptions:
* Called from a normal thread context
*
*******************************************************************************/
static int efm32_chan_wait(FAR struct efm32_usbhost_s *priv,
FAR struct efm32_chan_s *chan)
{
irqstate_t flags;
int ret;
/* Disable interrupts so that the following operations will be atomic. On
* the OTG FS global interrupt needs to be disabled. However, here we disable
* all interrupts to exploit that fact that interrupts will be re-enabled
* while we wait.
*/
flags = irqsave();
/* Loop, testing for an end of transfer conditino. The channel 'result'
* was set to EBUSY and 'waiter' was set to true before the transfer; 'waiter'
* will be set to false and 'result' will be set appropriately when the
* tranfer is completed.
*/
do
{
/* Wait for the transfer to complete. NOTE the transfer may already
* completed before we get here or the transfer may complete while we
* wait here.
*/
ret = sem_wait(&chan->waitsem);
/* sem_wait should succeeed. But it is possible that we could be
* awakened by a signal too.
*/
DEBUGASSERT(ret == OK || get_errno() == EINTR);
}
while (chan->waiter);
/* The transfer is complete re-enable interrupts and return the result */
ret = -(int)chan->result;
irqrestore(flags);
return ret;
}
/*******************************************************************************
* Name: efm32_chan_wakeup
*
* Description:
* A channel transfer has completed... wakeup any threads waiting for the
* transfer to complete.
*
* Assumptions:
* This function is called from the transfer complete interrupt handler for
* the channel. Interrupts are disabled.
*
*******************************************************************************/
static void efm32_chan_wakeup(FAR struct efm32_usbhost_s *priv,
FAR struct efm32_chan_s *chan)
{
/* Is the transfer complete? Is there a thread waiting for this transfer
* to complete?
*/
if (chan->result != EBUSY && chan->waiter)
{
usbhost_vtrace2(chan->in ? OTGFS_VTRACE2_CHANWAKEUP_IN :
OTGFS_VTRACE2_CHANWAKEUP_OUT,
chan->epno, chan->result);
efm32_givesem(&chan->waitsem);
chan->waiter = false;
}
}
/*******************************************************************************
* Name: efm32_transfer_start
*
* Description:
* Start at transfer on the select IN or OUT channel.
*
*******************************************************************************/
static void efm32_transfer_start(FAR struct efm32_usbhost_s *priv, int chidx)
{
FAR struct efm32_chan_s *chan;
uint32_t regval;
unsigned int npackets;
unsigned int maxpacket;
unsigned int avail;
unsigned int wrsize;
unsigned int minsize;
/* Set up the initial state of the transfer */
chan = &priv->chan[chidx];
usbhost_vtrace2(OTGFS_VTRACE2_STARTTRANSFER, chidx, chan->buflen);
chan->result = EBUSY;
chan->inflight = 0;
priv->chidx = chidx;
/* Compute the expected number of packets associated to the transfer.
* If the transfer length is zero (or less than the size of one maximum
* size packet), then one packet is expected.
*/
/* If the transfer size is greater than one packet, then calculate the
* number of packets that will be received/sent, including any partial
* final packet.
*/
maxpacket = chan->maxpacket;
if (chan->buflen > maxpacket)
{
npackets = (chan->buflen + maxpacket - 1) / maxpacket;
/* Clip if the buffer length if it exceeds the maximum number of
* packets that can be transferred (this should not happen).
*/
if (npackets > EFM32_MAX_PKTCOUNT)
{
npackets = EFM32_MAX_PKTCOUNT;
chan->buflen = EFM32_MAX_PKTCOUNT * maxpacket;
usbhost_trace2(OTGFS_TRACE2_CLIP, chidx, chan->buflen);
}
}
else
{
/* One packet will be sent/received (might be a zero length packet) */
npackets = 1;
}
/* If it is an IN transfer, then adjust the size of the buffer UP to
* a full number of packets. Hmmm... couldn't this cause an overrun
* into unallocated memory?
*/
#if 0 /* Think about this */
if (chan->in)
{
/* Force the buffer length to an even multiple of maxpacket */
chan->buflen = npackets * maxpacket;
}
#endif
/* Save the number of packets in the transfer. We will need this in
* order to set the next data toggle correctly when the transfer
* completes.
*/
chan->npackets = (uint8_t)npackets;
/* Setup the HCTSIZn register */
regval = ((uint32_t)chan->buflen << _OTGFS_HCTSIZ_XFRSIZ_SHIFT) |
((uint32_t)npackets << _OTGFS_HCTSIZ_PKTCNT_SHIFT) |
((uint32_t)chan->pid << _OTGFS_HCTSIZ_DPID_SHIFT);
efm32_putreg(EFM32_USB_HCTSIZ(chidx), regval);
/* Setup the HCCHAR register: Frame oddness and host channel enable */
regval = efm32_getreg(EFM32_USB_HCCHAR(chidx));
/* Set/clear the Odd Frame bit. Check for an even frame; if so set Odd
* Frame. This field is applicable for only periodic (isochronous and
* interrupt) channels.
*/
if ((efm32_getreg(EFM32_USB_HFNUM) & 1) == 0)
{
regval |= OTGFS_HCCHAR_ODDFRM;
}
else
{
regval &= ~OTGFS_HCCHAR_ODDFRM;
}
regval &= ~OTGFS_HCCHAR_CHDIS;
regval |= OTGFS_HCCHAR_CHENA;
efm32_putreg(EFM32_USB_HCCHAR(chidx), regval);
/* If this is an out transfer, then we need to do more.. we need to copy
* the outgoing data into the correct TxFIFO.
*/
if (!chan->in && chan->buflen > 0)
{
/* Handle non-periodic (CTRL and BULK) OUT transfers differently than
* periodic (INTR and ISOC) OUT transfers.
*/
minsize = MIN(chan->buflen, chan->maxpacket);
switch (chan->eptype)
{
case OTGFS_EPTYPE_CTRL: /* Non periodic transfer */
case OTGFS_EPTYPE_BULK:
{
/* Read the Non-periodic Tx FIFO status register */
regval = efm32_getreg(EFM32_USB_HNPTXSTS);
avail = ((regval & _OTGFS_HNPTXSTS_NPTXFSAV_MASK) >> _OTGFS_HNPTXSTS_NPTXFSAV_SHIFT) << 2;
}
break;
/* Periodic transfer */
case OTGFS_EPTYPE_INTR:
case OTGFS_EPTYPE_ISOC:
{
/* Read the Non-periodic Tx FIFO status register */
regval = efm32_getreg(EFM32_USB_HPTXSTS);
avail = ((regval & _OTGFS_HPTXSTS_PTXFSAVL_MASK) >> _OTGFS_HPTXSTS_PTXFSAVL_SHIFT) << 2;
}
break;
default:
DEBUGASSERT(false);
return;
}
/* Is there space in the TxFIFO to hold the minimum size packet? */
if (minsize <= avail)
{
/* Yes.. Get the size of the biggest thing that we can put in the Tx FIFO now */
wrsize = chan->buflen;
if (wrsize > avail)
{
/* Clip the write size to the number of full, max sized packets
* that will fit in the Tx FIFO.
*/
unsigned int wrpackets = avail / chan->maxpacket;
wrsize = wrpackets * chan->maxpacket;
}
/* Write packet into the Tx FIFO. */
efm32_gint_wrpacket(priv, chan->buffer, chidx, wrsize);
}
/* Did we put the entire buffer into the Tx FIFO? */
if (chan->buflen > avail)
{
/* No, there was insufficient space to hold the entire transfer ...
* Enable the Tx FIFO interrupt to handle the transfer when the Tx
* FIFO becomes empty.
*/
efm32_txfe_enable(priv, chidx);
}
}
}
/*******************************************************************************
* Name: efm32_getframe
*
* Description:
* Get the current frame number. The frame number (FRNUM) field increments
* when a new SOF is transmitted on the USB, and is cleared to 0 when it
* reaches 0x3fff.
*
*******************************************************************************/
#if 0 /* Not used */
static inline uint16_t efm32_getframe(void)
{
return (uint16_t)(efm32_getreg(EFM32_USB_HFNUM) & _OTGFS_HFNUM_FRNUM_MASK);
}
#endif
/*******************************************************************************
* Name: efm32_ctrl_sendsetup
*
* Description:
* Send an IN/OUT SETUP packet.
*
*******************************************************************************/
static int efm32_ctrl_sendsetup(FAR struct efm32_usbhost_s *priv,
FAR const struct usb_ctrlreq_s *req)
{
FAR struct efm32_chan_s *chan;
uint32_t start;
uint32_t elapsed;
int ret;
/* Loop while the device reports NAK (and a timeout is not exceeded */
chan = &priv->chan[priv->ep0out];
start = clock_systimer();
do
{
/* Send the SETUP packet */
chan->pid = OTGFS_PID_SETUP;
chan->buffer = (FAR uint8_t *)req;
chan->buflen = USB_SIZEOF_CTRLREQ;
/* Set up for the wait BEFORE starting the transfer */
ret = efm32_chan_waitsetup(priv, chan);
if (ret != OK)
{
usbhost_trace1(OTGFS_TRACE1_DEVDISCONN, 0);
return ret;
}
/* Start the transfer */
efm32_transfer_start(priv, priv->ep0out);
/* Wait for the transfer to complete */
ret = efm32_chan_wait(priv, chan);
/* Return on success and for all failures other than EAGAIN. EAGAIN
* means that the device NAKed the SETUP command and that we should
* try a few more times.
*/
if (ret != -EAGAIN)
{
/* Output some debug information if the transfer failed */
if (ret < 0)
{
usbhost_trace1(OTGFS_TRACE1_TRNSFRFAILED, ret);
}
/* Return the result in any event */
return ret;
}
/* Get the elapsed time (in frames) */
elapsed = clock_systimer() - start;
}
while (elapsed < EFM32_SETUP_DELAY);
return -ETIMEDOUT;
}
/*******************************************************************************
* Name: efm32_ctrl_senddata
*
* Description:
* Send data in the data phase of an OUT control transfer. Or send status
* in the status phase of an IN control transfer
*
*******************************************************************************/
static int efm32_ctrl_senddata(FAR struct efm32_usbhost_s *priv,
FAR uint8_t *buffer, unsigned int buflen)
{
FAR struct efm32_chan_s *chan = &priv->chan[priv->ep0out];
int ret;
/* Save buffer information */
chan->buffer = buffer;
chan->buflen = buflen;
/* Set the DATA PID */
if (buflen == 0)
{
/* For status OUT stage with buflen == 0, set PID DATA1 */
chan->outdata1 = true;
}
/* Set the Data PID as per the outdata1 boolean */
chan->pid = chan->outdata1 ? OTGFS_PID_DATA1 : OTGFS_PID_DATA0;
/* Set up for the wait BEFORE starting the transfer */
ret = efm32_chan_waitsetup(priv, chan);
if (ret != OK)
{
usbhost_trace1(OTGFS_TRACE1_DEVDISCONN, 0);
return ret;
}
/* Start the transfer */
efm32_transfer_start(priv, priv->ep0out);
/* Wait for the transfer to complete and return the result */
return efm32_chan_wait(priv, chan);
}
/*******************************************************************************
* Name: efm32_ctrl_recvdata
*
* Description:
* Receive data in the data phase of an IN control transfer. Or receive status
* in the status phase of an OUT control transfer
*
*******************************************************************************/
static int efm32_ctrl_recvdata(FAR struct efm32_usbhost_s *priv,
FAR uint8_t *buffer, unsigned int buflen)
{
FAR struct efm32_chan_s *chan = &priv->chan[priv->ep0in];
int ret;
/* Save buffer information */
chan->pid = OTGFS_PID_DATA1;
chan->buffer = buffer;
chan->buflen = buflen;
/* Set up for the wait BEFORE starting the transfer */
ret = efm32_chan_waitsetup(priv, chan);
if (ret != OK)
{
usbhost_trace1(OTGFS_TRACE1_DEVDISCONN, 0);
return ret;
}
/* Start the transfer */
efm32_transfer_start(priv, priv->ep0in);
/* Wait for the transfer to complete and return the result */
return efm32_chan_wait(priv, chan);
}
/*******************************************************************************
* Name: efm32_in_transfer
*
* Description:
* Transfer 'buflen' bytes into 'buffer' from an IN channel.
*
*******************************************************************************/
static int efm32_in_transfer(FAR struct efm32_usbhost_s *priv, int chidx,
FAR uint8_t *buffer, size_t buflen)
{
FAR struct efm32_chan_s *chan;
uint32_t start;
uint32_t elapsed;
int ret = OK;
/* Loop until the transfer completes (i.e., buflen is decremented to zero)
* or a fatal error occurs (any error other than a simple NAK)
*/
chan = &priv->chan[chidx];
chan->buffer = buffer;
chan->buflen = buflen;
start = clock_systimer();
while (chan->buflen > 0)
{
/* Set up for the wait BEFORE starting the transfer */
ret = efm32_chan_waitsetup(priv, chan);
if (ret != OK)
{
usbhost_trace1(OTGFS_TRACE1_DEVDISCONN, 0);
return ret;
}
/* Set up for the transfer based on the direction and the endpoint type */
switch (chan->eptype)
{
default:
case OTGFS_EPTYPE_CTRL: /* Control */
{
/* This kind of transfer on control endpoints other than EP0 are not
* currently supported
*/
return -ENOSYS;
}
case OTGFS_EPTYPE_ISOC: /* Isochronous */
{
/* Set up the IN data PID */
usbhost_vtrace2(OTGFS_VTRACE2_ISOCIN, chidx, buflen);
chan->pid = OTGFS_PID_DATA0;
}
break;
case OTGFS_EPTYPE_BULK: /* Bulk */
{
/* Setup the IN data PID */
usbhost_vtrace2(OTGFS_VTRACE2_BULKIN, chidx, buflen);
chan->pid = chan->indata1 ? OTGFS_PID_DATA1 : OTGFS_PID_DATA0;
}
break;
case OTGFS_EPTYPE_INTR: /* Interrupt */
{
/* Setup the IN data PID */
usbhost_vtrace2(OTGFS_VTRACE2_INTRIN, chidx, buflen);
chan->pid = chan->indata1 ? OTGFS_PID_DATA1 : OTGFS_PID_DATA0;
}
break;
}
/* Start the transfer */
efm32_transfer_start(priv, chidx);
/* Wait for the transfer to complete and get the result */
ret = efm32_chan_wait(priv, chan);
/* EAGAIN indicates that the device NAKed the transfer and we need
* do try again. Anything else (success or other errors) will
* cause use to return
*/
if (ret != OK)
{
usbhost_trace1(OTGFS_TRACE1_TRNSFRFAILED,ret);
/* Check for a special case: If (1) the transfer was NAKed and (2)
* no Tx FIFO empty or Rx FIFO not-empty event occurred, then we
* should be able to just flush the Rx and Tx FIFOs and try again.
* We can detect this latter case becasue the then the transfer
* buffer pointer and buffer size will be unaltered.
*/
elapsed = clock_systimer() - start;
if (ret != -EAGAIN || /* Not a NAK condition OR */
elapsed >= EFM32_DATANAK_DELAY || /* Timeout has elapsed OR */
chan->buflen != buflen) /* Data has been partially transferred */
{
/* Break out and return the error */
break;
}
}
}
return ret;
}
/*******************************************************************************
* Name: efm32_out_transfer
*
* Description:
* Transfer the 'buflen' bytes in 'buffer' through an OUT channel.
*
*******************************************************************************/
static int efm32_out_transfer(FAR struct efm32_usbhost_s *priv, int chidx,
FAR uint8_t *buffer, size_t buflen)
{
FAR struct efm32_chan_s *chan;
uint32_t start;
uint32_t elapsed;
size_t xfrlen;
int ret = OK;
/* Loop until the transfer completes (i.e., buflen is decremented to zero)
* or a fatal error occurs (any error other than a simple NAK)
*/
chan = &priv->chan[chidx];
start = clock_systimer();
while (buflen > 0)
{
/* Transfer one packet at a time. The hardware is capable of queueing
* multiple OUT packets, but I just haven't figured out how to handle
* the case where a single OUT packet in the group is NAKed.
*/
xfrlen = MIN(chan->maxpacket, buflen);
chan->buffer = buffer;
chan->buflen = xfrlen;
/* Set up for the wait BEFORE starting the transfer */
ret = efm32_chan_waitsetup(priv, chan);
if (ret != OK)
{
usbhost_trace1(OTGFS_TRACE1_DEVDISCONN,0);
return ret;
}
/* Set up for the transfer based on the direction and the endpoint type */
switch (chan->eptype)
{
default:
case OTGFS_EPTYPE_CTRL: /* Control */
{
/* This kind of transfer on control endpoints other than EP0 are not
* currently supported
*/
return -ENOSYS;
}
case OTGFS_EPTYPE_ISOC: /* Isochronous */
{
/* Set up the OUT data PID */
usbhost_vtrace2(OTGFS_VTRACE2_ISOCOUT, chidx, buflen);
chan->pid = OTGFS_PID_DATA0;
}
break;
case OTGFS_EPTYPE_BULK: /* Bulk */
{
/* Setup the OUT data PID */
usbhost_vtrace2(OTGFS_VTRACE2_BULKOUT, chidx, buflen);
chan->pid = chan->outdata1 ? OTGFS_PID_DATA1 : OTGFS_PID_DATA0;
}
break;
case OTGFS_EPTYPE_INTR: /* Interrupt */
{
/* Setup the OUT data PID */
usbhost_vtrace2(OTGFS_VTRACE2_INTROUT, chidx, buflen);
chan->pid = chan->outdata1 ? OTGFS_PID_DATA1 : OTGFS_PID_DATA0;
/* Toggle the OUT data PID for the next transfer */
chan->outdata1 ^= true;
}
break;
}
/* Start the transfer */
efm32_transfer_start(priv, chidx);
/* Wait for the transfer to complete and get the result */
ret = efm32_chan_wait(priv, chan);
/* Handle transfer failures */
if (ret != OK)
{
usbhost_trace1(OTGFS_TRACE1_TRNSFRFAILED,ret);
/* Check for a special case: If (1) the transfer was NAKed and (2)
* no Tx FIFO empty or Rx FIFO not-empty event occurred, then we
* should be able to just flush the Rx and Tx FIFOs and try again.
* We can detect this latter case becasue the then the transfer
* buffer pointer and buffer size will be unaltered.
*/
elapsed = clock_systimer() - start;
if (ret != -EAGAIN || /* Not a NAK condition OR */
elapsed >= EFM32_DATANAK_DELAY || /* Timeout has elapsed OR */
chan->buflen != xfrlen) /* Data has been partially transferred */
{
/* Break out and return the error */
break;
}
/* Is this flush really necessary? What does the hardware do with the
* data in the FIFO when the NAK occurs? Does it discard it?
*/
efm32_flush_txfifos(USB_GRSTCTL_TXFNUM_HALL);
/* Get the device a little time to catch up. Then retry the transfer
* using the same buffer pointer and length.
*/
usleep(20*1000);
}
else
{
/* Successfully transferred. Update the buffer pointer and length */
buffer += xfrlen;
buflen -= xfrlen;
}
}
return ret;
}
/*******************************************************************************
* Name: efm32_gint_wrpacket
*
* Description:
* Transfer the 'buflen' bytes in 'buffer' to the Tx FIFO associated with
* 'chidx' (non-DMA).
*
*******************************************************************************/
static void efm32_gint_wrpacket(FAR struct efm32_usbhost_s *priv,
FAR uint8_t *buffer, int chidx, int buflen)
{
FAR uint32_t *src;
uint32_t fifo;
int buflen32;
efm32_pktdump("Sending", buffer, buflen);
/* Get the number of 32-byte words associated with this byte size */
buflen32 = (buflen + 3) >> 2;
/* Get the address of the Tx FIFO associated with this channel */
fifo = EFM32_USB_DFIFO_HCH(chidx);
/* Transfer all of the data into the Tx FIFO */
src = (FAR uint32_t *)buffer;
for (; buflen32 > 0; buflen32--)
{
uint32_t data = *src++;
efm32_putreg(fifo, data);
}
/* Increment the count of bytes "in-flight" in the Tx FIFO */
priv->chan[chidx].inflight += buflen;
}
/*******************************************************************************
* Name: efm32_gint_hcinisr
*
* Description:
* USB OTG FS host IN channels interrupt handler
*
* One the completion of the transfer, the channel result byte may be set as
* follows:
*
* OK - Transfer completed successfully
* EAGAIN - If devices NAKs the transfer or NYET occurs
* EPERM - If the endpoint stalls
* EIO - On a TX or data toggle error
* EPIPE - Frame overrun
*
* EBUSY in the result field indicates that the transfer has not completed.
*
*******************************************************************************/
static inline void efm32_gint_hcinisr(FAR struct efm32_usbhost_s *priv,
int chidx)
{
FAR struct efm32_chan_s *chan = &priv->chan[chidx];
uint32_t regval;
uint32_t pending;
/* Read the HCINT register to get the pending HC interrupts. Read the
* HCINTMSK register to get the set of enabled HC interrupts.
*/
pending = efm32_getreg(EFM32_USB_HCINT(chidx));
regval = efm32_getreg(EFM32_USB_HCINTMSK(chidx));
/* AND the two to get the set of enabled, pending HC interrupts */
pending &= regval;
ullvdbg("HCINTMSK%d: %08x pending: %08x\n", chidx, regval, pending);
/* Check for a pending ACK response received/transmitted (ACK) interrupt */
if ((pending & OTGFS_HCINT_ACK) != 0)
{
/* Clear the pending the ACK response received/transmitted (ACK) interrupt */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_ACK);
}
/* Check for a pending STALL response receive (STALL) interrupt */
else if ((pending & OTGFS_HCINT_STALL) != 0)
{
/* Clear the NAK and STALL Conditions. */
efm32_putreg(EFM32_USB_HCINT(chidx), (OTGFS_HCINT_NAK | OTGFS_HCINT_STALL));
/* Halt the channel when a STALL, TXERR, BBERR or DTERR interrupt is
* received on the channel.
*/
efm32_chan_halt(priv, chidx, CHREASON_STALL);
/* When there is a STALL, clear any pending NAK so that it is not
* processed below.
*/
pending &= ~OTGFS_HCINT_NAK;
}
/* Check for a pending Data Toggle ERRor (DTERR) interrupt */
else if ((pending & OTGFS_HCINT_DTERR) != 0)
{
/* Halt the channel when a STALL, TXERR, BBERR or DTERR interrupt is
* received on the channel.
*/
efm32_chan_halt(priv, chidx, CHREASON_DTERR);
/* Clear the NAK and data toggle error conditions */
efm32_putreg(EFM32_USB_HCINT(chidx), (OTGFS_HCINT_NAK | OTGFS_HCINT_DTERR));
}
/* Check for a pending FRaMe OverRun (FRMOR) interrupt */
if ((pending & OTGFS_HCINT_FRMOR) != 0)
{
/* Halt the channel -- the CHH interrrupt is expected next */
efm32_chan_halt(priv, chidx, CHREASON_FRMOR);
/* Clear the FRaMe OverRun (FRMOR) condition */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_FRMOR);
}
/* Check for a pending TransFeR Completed (XFRC) interrupt */
else if ((pending & OTGFS_HCINT_XFRC) != 0)
{
/* Clear the TransFeR Completed (XFRC) condition */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_XFRC);
/* Then handle the transfer completion event based on the endpoint type */
if (chan->eptype == OTGFS_EPTYPE_CTRL || chan->eptype == OTGFS_EPTYPE_BULK)
{
/* Halt the channel -- the CHH interrrupt is expected next */
efm32_chan_halt(priv, chidx, CHREASON_XFRC);
/* Clear any pending NAK condition. The 'indata1' data toggle
* should have been appropriately updated by the RxFIFO
* logic as each packet was received.
*/
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_NAK);
}
else if (chan->eptype == OTGFS_EPTYPE_INTR)
{
/* Force the next transfer on an ODD frame */
regval = efm32_getreg(EFM32_USB_HCCHAR(chidx));
regval |= OTGFS_HCCHAR_ODDFRM;
efm32_putreg(EFM32_USB_HCCHAR(chidx), regval);
/* Set the request done state */
chan->result = OK;
}
}
/* Check for a pending CHannel Halted (CHH) interrupt */
else if ((pending & OTGFS_HCINT_CHH) != 0)
{
/* Mask the CHannel Halted (CHH) interrupt */
regval = efm32_getreg(EFM32_USB_HCINTMSK(chidx));
regval &= ~OTGFS_HCINT_CHH;
efm32_putreg(EFM32_USB_HCINTMSK(chidx), regval);
/* Update the request state based on the host state machine state */
if (chan->chreason == CHREASON_XFRC)
{
/* Set the request done reult */
chan->result = OK;
}
else if (chan->chreason == CHREASON_STALL)
{
/* Set the request stall result */
chan->result = EPERM;
}
else if ((chan->chreason == CHREASON_TXERR) ||
(chan->chreason == CHREASON_DTERR))
{
/* Set the request I/O error result */
chan->result = EIO;
}
else if (chan->chreason == CHREASON_NAK)
{
/* Halt on NAK only happens on an INTR channel. Fetch the HCCHAR register
* and check for an interrupt endpoint.
*/
regval = efm32_getreg(EFM32_USB_HCCHAR(chidx));
if ((regval & _OTGFS_HCCHAR_EPTYP_MASK) == OTGFS_HCCHAR_EPTYP_INTR)
{
/* Toggle the IN data toggle (Used by Bulk and INTR only) */
chan->indata1 ^= true;
}
/* Set the NAK error result */
chan->result = EAGAIN;
}
else /* if (chan->chreason == CHREASON_FRMOR) */
{
/* Set the frame overrun error result */
chan->result = EPIPE;
}
/* Clear the CHannel Halted (CHH) condition */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_CHH);
}
/* Check for a pending Transaction ERror (TXERR) interrupt */
else if ((pending & OTGFS_HCINT_TXERR) != 0)
{
/* Halt the channel when a STALL, TXERR, BBERR or DTERR interrupt is
* received on the channel.
*/
efm32_chan_halt(priv, chidx, CHREASON_TXERR);
/* Clear the Transaction ERror (TXERR) condition */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_TXERR);
}
/* Check for a pending NAK response received (NAK) interrupt */
else if ((pending & OTGFS_HCINT_NAK) != 0)
{
/* For a BULK transfer, the hardware is capable of retrying
* automatically on a NAK. However, this is not always
* what we need to do. So we always halt the transfer and
* return control to high level logic in the even of a NAK.
*/
#if 1
/* Halt the interrupt channel */
if (chan->eptype == OTGFS_EPTYPE_INTR)
{
/* Halt the channel -- the CHH interrupt is expected next */
efm32_chan_halt(priv, chidx, CHREASON_NAK);
}
/* Re-activate CTRL and BULK channels */
else if (chan->eptype == OTGFS_EPTYPE_CTRL ||
chan->eptype == OTGFS_EPTYPE_BULK)
{
/* Re-activate the channel by clearing CHDIS and assuring that
* CHENA is set
*/
regval = efm32_getreg(EFM32_USB_HCCHAR(chidx));
regval |= OTGFS_HCCHAR_CHENA;
regval &= ~OTGFS_HCCHAR_CHDIS;
efm32_putreg(EFM32_USB_HCCHAR(chidx), regval);
}
#else
/* Halt all transfers on the NAK -- the CHH interrupt is expected next */
efm32_chan_halt(priv, chidx, CHREASON_NAK);
#endif
/* Clear the NAK condition */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_NAK);
}
/* Check for a transfer complete event */
efm32_chan_wakeup(priv, chan);
}
/*******************************************************************************
* Name: efm32_gint_hcoutisr
*
* Description:
* USB OTG FS host OUT channels interrupt handler
*
* One the completion of the transfer, the channel result byte may be set as
* follows:
*
* OK - Transfer completed successfully
* EAGAIN - If devices NAKs the transfer or NYET occurs
* EPERM - If the endpoint stalls
* EIO - On a TX or data toggle error
* EPIPE - Frame overrun
*
* EBUSY in the result field indicates that the transfer has not completed.
*
*******************************************************************************/
static inline void efm32_gint_hcoutisr(FAR struct efm32_usbhost_s *priv,
int chidx)
{
FAR struct efm32_chan_s *chan = &priv->chan[chidx];
uint32_t regval;
uint32_t pending;
/* Read the HCINT register to get the pending HC interrupts. Read the
* HCINTMSK register to get the set of enabled HC interrupts.
*/
pending = efm32_getreg(EFM32_USB_HCINT(chidx));
regval = efm32_getreg(EFM32_USB_HCINTMSK(chidx));
/* AND the two to get the set of enabled, pending HC interrupts */
pending &= regval;
ullvdbg("HCINTMSK%d: %08x pending: %08x\n", chidx, regval, pending);
/* Check for a pending ACK response received/transmitted (ACK) interrupt */
if ((pending & OTGFS_HCINT_ACK) != 0)
{
/* Clear the pending the ACK response received/transmitted (ACK) interrupt */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_ACK);
}
/* Check for a pending FRaMe OverRun (FRMOR) interrupt */
else if ((pending & OTGFS_HCINT_FRMOR) != 0)
{
/* Halt the channel (probably not necessary for FRMOR) */
efm32_chan_halt(priv, chidx, CHREASON_FRMOR);
/* Clear the pending the FRaMe OverRun (FRMOR) interrupt */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_FRMOR);
}
/* Check for a pending TransFeR Completed (XFRC) interrupt */
else if ((pending & OTGFS_HCINT_XFRC) != 0)
{
/* Decrement the number of bytes remaining by the number of
* bytes that were "in-flight".
*/
priv->chan[chidx].buffer += priv->chan[chidx].inflight;
priv->chan[chidx].buflen -= priv->chan[chidx].inflight;
priv->chan[chidx].inflight = 0;
/* Halt the channel -- the CHH interrrupt is expected next */
efm32_chan_halt(priv, chidx, CHREASON_XFRC);
/* Clear the pending the TransFeR Completed (XFRC) interrupt */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_XFRC);
}
/* Check for a pending STALL response receive (STALL) interrupt */
else if ((pending & OTGFS_HCINT_STALL) != 0)
{
/* Clear the pending the STALL response receiv (STALL) interrupt */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_STALL);
/* Halt the channel when a STALL, TXERR, BBERR or DTERR interrupt is
* received on the channel.
*/
efm32_chan_halt(priv, chidx, CHREASON_STALL);
}
/* Check for a pending NAK response received (NAK) interrupt */
else if ((pending & OTGFS_HCINT_NAK) != 0)
{
/* Halt the channel -- the CHH interrrupt is expected next */
efm32_chan_halt(priv, chidx, CHREASON_NAK);
/* Clear the pending the NAK response received (NAK) interrupt */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_NAK);
}
/* Check for a pending Transaction ERror (TXERR) interrupt */
else if ((pending & OTGFS_HCINT_TXERR) != 0)
{
/* Halt the channel when a STALL, TXERR, BBERR or DTERR interrupt is
* received on the channel.
*/
efm32_chan_halt(priv, chidx, CHREASON_TXERR);
/* Clear the pending the Transaction ERror (TXERR) interrupt */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_TXERR);
}
/* Check for a NYET interrupt */
#if 0 /* NYET is a reserved bit in the HCINT register */
else if ((pending & OTGFS_HCINT_NYET) != 0)
{
/* Halt the channel */
efm32_chan_halt(priv, chidx, CHREASON_NYET);
/* Clear the pending the NYET interrupt */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_NYET);
}
#endif
/* Check for a pending Data Toggle ERRor (DTERR) interrupt */
else if (pending & OTGFS_HCINT_DTERR)
{
/* Halt the channel when a STALL, TXERR, BBERR or DTERR interrupt is
* received on the channel.
*/
efm32_chan_halt(priv, chidx, CHREASON_DTERR);
/* Clear the pending the Data Toggle ERRor (DTERR) and NAK interrupts */
efm32_putreg(EFM32_USB_HCINT(chidx), (OTGFS_HCINT_DTERR | OTGFS_HCINT_NAK));
}
/* Check for a pending CHannel Halted (CHH) interrupt */
else if ((pending & OTGFS_HCINT_CHH) != 0)
{
/* Mask the CHannel Halted (CHH) interrupt */
regval = efm32_getreg(EFM32_USB_HCINTMSK(chidx));
regval &= ~OTGFS_HCINT_CHH;
efm32_putreg(EFM32_USB_HCINTMSK(chidx), regval);
if (chan->chreason == CHREASON_XFRC)
{
/* Set the request done result */
chan->result = OK;
/* Read the HCCHAR register to get the HCCHAR register to get
* the endpoint type.
*/
regval = efm32_getreg(EFM32_USB_HCCHAR(chidx));
/* Is it a bulk endpoint? Were an odd number of packets
* transferred?
*/
if ((regval & _OTGFS_HCCHAR_EPTYP_MASK) == OTGFS_HCCHAR_EPTYP_BULK &&
(chan->npackets & 1) != 0)
{
/* Yes to both... toggle the data out PID */
chan->outdata1 ^= true;
}
}
else if (chan->chreason == CHREASON_NAK ||
chan->chreason == CHREASON_NYET)
{
/* Set the try again later result */
chan->result = EAGAIN;
}
else if (chan->chreason == CHREASON_STALL)
{
/* Set the request stall result */
chan->result = EPERM;
}
else if ((chan->chreason == CHREASON_TXERR) ||
(chan->chreason == CHREASON_DTERR))
{
/* Set the I/O failure result */
chan->result = EIO;
}
else /* if (chan->chreason == CHREASON_FRMOR) */
{
/* Set the frame error result */
chan->result = EPIPE;
}
/* Clear the pending the CHannel Halted (CHH) interrupt */
efm32_putreg(EFM32_USB_HCINT(chidx), OTGFS_HCINT_CHH);
}
/* Check for a transfer complete event */
efm32_chan_wakeup(priv, chan);
}
/*******************************************************************************
* Name: efm32_gint_connected
*
* Description:
* Handle a connection event.
*
*******************************************************************************/
static void efm32_gint_connected(FAR struct efm32_usbhost_s *priv)
{
/* We we previously disconnected? */
if (!priv->connected)
{
/* Yes.. then now we are connected */
usbhost_vtrace1(OTGFS_VTRACE1_CONNECTED,0);
priv->connected = true;
DEBUGASSERT(priv->smstate == SMSTATE_DETACHED);
/* Notify any waiters */
priv->smstate = SMSTATE_ATTACHED;
if (priv->eventwait)
{
efm32_givesem(&priv->eventsem);
priv->eventwait = false;
}
}
}
/*******************************************************************************
* Name: efm32_gint_disconnected
*
* Description:
* Handle a disconnection event.
*
*******************************************************************************/
static void efm32_gint_disconnected(FAR struct efm32_usbhost_s *priv)
{
/* Were we previously connected? */
if (priv->connected)
{
/* Yes.. then we no longer connected */
usbhost_vtrace1(OTGFS_VTRACE1_DISCONNECTED,0);
/* Are we bound to a class driver? */
if (priv->class)
{
/* Yes.. Disconnect the class driver */
CLASS_DISCONNECTED(priv->class);
priv->class = NULL;
}
/* Re-Initilaize Host for new Enumeration */
priv->smstate = SMSTATE_DETACHED;
priv->ep0size = EFM32_EP0_MAX_PACKET_SIZE;
priv->devaddr = EFM32_DEF_DEVADDR;
priv->connected = false;
priv->lowspeed = false;
efm32_chan_freeall(priv);
/* Notify any waiters that there is a change in the connection state */
if (priv->eventwait)
{
efm32_givesem(&priv->eventsem);
priv->eventwait = false;
}
}
}
/*******************************************************************************
* Name: efm32_gint_sofisr
*
* Description:
* USB OTG FS start-of-frame interrupt handler
*
*******************************************************************************/
#ifdef CONFIG_EFM32_OTGFS_SOFINTR
static inline void efm32_gint_sofisr(FAR struct efm32_usbhost_s *priv)
{
/* Handle SOF interrupt */
#warning "Do what?"
/* Clear pending SOF interrupt */
efm32_putreg(EFM32_USB_GINTSTS, USB_GINT_SOF);
}
#endif
/*******************************************************************************
* Name: efm32_gint_rxflvlisr
*
* Description:
* USB OTG FS RxFIFO non-empty interrupt handler
*
*******************************************************************************/
static inline void efm32_gint_rxflvlisr(FAR struct efm32_usbhost_s *priv)
{
FAR uint32_t *dest;
uint32_t grxsts;
uint32_t intmsk;
uint32_t hcchar;
uint32_t hctsiz;
uint32_t fifo;
int bcnt;
int bcnt32;
int chidx;
int i;
/* Disable the RxFIFO non-empty interrupt */
intmsk = efm32_getreg(EFM32_USB_GINTMSK);
intmsk &= ~USB_GINT_RXFLVL;
efm32_putreg(EFM32_USB_GINTMSK, intmsk);
/* Read and pop the next status from the Rx FIFO */
grxsts = efm32_getreg(EFM32_USB_GRXSTSP);
ullvdbg("GRXSTS: %08x\n", grxsts);
/* Isolate the channel number/index in the status word */
chidx = (grxsts & _OTGFS_GRXSTSH_CHNUM_MASK) >> _OTGFS_GRXSTSH_CHNUM_SHIFT;
/* Get the host channel characteristics register (HCCHAR) for this channel */
hcchar = efm32_getreg(EFM32_USB_HCCHAR(chidx));
/* Then process the interrupt according to the packet status */
switch (grxsts & _OTGFS_GRXSTSH_PKTSTS_MASK)
{
case OTGFS_GRXSTSH_PKTSTS_INRECVD: /* IN data packet received */
{
/* Read the data into the host buffer. */
bcnt = (grxsts & _OTGFS_GRXSTSH_BCNT_MASK) >> _OTGFS_GRXSTSH_BCNT_SHIFT;
if (bcnt > 0 && priv->chan[chidx].buffer != NULL)
{
/* Transfer the packet from the Rx FIFO into the user buffer */
dest = (FAR uint32_t *)priv->chan[chidx].buffer;
fifo = EFM32_USB_DFIFO_HCH(0);
bcnt32 = (bcnt + 3) >> 2;
for (i = 0; i < bcnt32; i++)
{
*dest++ = efm32_getreg(fifo);
}
efm32_pktdump("Received", priv->chan[chidx].buffer, bcnt);
/* Toggle the IN data pid (Used by Bulk and INTR only) */
priv->chan[chidx].indata1 ^= true;
/* Manage multiple packet transfers */
priv->chan[chidx].buffer += bcnt;
priv->chan[chidx].buflen -= bcnt;
/* Check if more packets are expected */
hctsiz = efm32_getreg(EFM32_USB_HCTSIZ(chidx));
if ((hctsiz & _OTGFS_HCTSIZ_PKTCNT_MASK) != 0)
{
/* Re-activate the channel when more packets are expected */
hcchar |= OTGFS_HCCHAR_CHENA;
hcchar &= ~OTGFS_HCCHAR_CHDIS;
efm32_putreg(EFM32_USB_HCCHAR(chidx), hcchar);
}
}
}
break;
case OTGFS_GRXSTSH_PKTSTS_INDONE: /* IN transfer completed */
case OTGFS_GRXSTSH_PKTSTS_DTOGERR: /* Data toggle error */
case OTGFS_GRXSTSH_PKTSTS_HALTED: /* Channel halted */
default:
break;
}
/* Re-enable the RxFIFO non-empty interrupt */
intmsk |= USB_GINT_RXFLVL;
efm32_putreg(EFM32_USB_GINTMSK, intmsk);
}
/*******************************************************************************
* Name: efm32_gint_nptxfeisr
*
* Description:
* USB OTG FS non-periodic TxFIFO empty interrupt handler
*
*******************************************************************************/
static inline void efm32_gint_nptxfeisr(FAR struct efm32_usbhost_s *priv)
{
FAR struct efm32_chan_s *chan;
uint32_t regval;
unsigned int wrsize;
unsigned int avail;
unsigned int chidx;
/* Recover the index of the channel that is waiting for space in the Tx
* FIFO.
*/
chidx = priv->chidx;
chan = &priv->chan[chidx];
/* Reduce the buffer size by the number of bytes that were previously placed
* in the Tx FIFO.
*/
chan->buffer += chan->inflight;
chan->buflen -= chan->inflight;
chan->inflight = 0;
/* If we have now transfered the entire buffer, then this transfer is
* complete (this case really should never happen because we disable
* the NPTXFE interrupt on the final packet).
*/
if (chan->buflen <= 0)
{
/* Disable further Tx FIFO empty interrupts and bail. */
efm32_modifyreg(EFM32_USB_GINTMSK, USB_GINT_NPTXFE, 0);
return;
}
/* Read the status from the top of the non-periodic TxFIFO */
regval = efm32_getreg(EFM32_USB_HNPTXSTS);
/* Extract the number of bytes available in the non-periodic Tx FIFO. */
avail = ((regval & _OTGFS_HNPTXSTS_NPTXFSAV_MASK) >> _OTGFS_HNPTXSTS_NPTXFSAV_SHIFT) << 2;
/* Get minimal size packet that can be sent. Something is seriously
* configured wrong if one packet will not fit into the empty Tx FIFO.
*/
DEBUGASSERT(chan->buflen > 0 &&
avail >= MIN(chan->buflen, chan->maxpacket));
/* Get the size to put in the Tx FIFO now */
wrsize = chan->buflen;
if (wrsize > avail)
{
/* Clip the write size to the number of full, max sized packets
* that will fit in the Tx FIFO.
*/
unsigned int wrpackets = avail / chan->maxpacket;
wrsize = wrpackets * chan->maxpacket;
}
/* Otherwise, this will be the last packet to be sent in this transaction.
* We now need to disable further NPTXFE interrupts.
*/
else
{
efm32_modifyreg(EFM32_USB_GINTMSK, USB_GINT_NPTXFE, 0);
}
/* Write the next group of packets into the Tx FIFO */
ullvdbg("HNPTXSTS: %08x chidx: %d avail: %d buflen: %d wrsize: %d\n",
regval, chidx, avail, chan->buflen, wrsize);
efm32_gint_wrpacket(priv, chan->buffer, chidx, wrsize);
}
/*******************************************************************************
* Name: efm32_gint_ptxfeisr
*
* Description:
* USB OTG FS periodic TxFIFO empty interrupt handler
*
*******************************************************************************/
static inline void efm32_gint_ptxfeisr(FAR struct efm32_usbhost_s *priv)
{
FAR struct efm32_chan_s *chan;
uint32_t regval;
unsigned int wrsize;
unsigned int avail;
unsigned int chidx;
/* Recover the index of the channel that is waiting for space in the Tx
* FIFO.
*/
chidx = priv->chidx;
chan = &priv->chan[chidx];
/* Reduce the buffer size by the number of bytes that were previously placed
* in the Tx FIFO.
*/
chan->buffer += chan->inflight;
chan->buflen -= chan->inflight;
chan->inflight = 0;
/* If we have now transfered the entire buffer, then this transfer is
* complete (this case really should never happen because we disable
* the PTXFE interrupt on the final packet).
*/
if (chan->buflen <= 0)
{
/* Disable further Tx FIFO empty interrupts and bail. */
efm32_modifyreg(EFM32_USB_GINTMSK, USB_GINT_PTXFE, 0);
return;
}
/* Read the status from the top of the periodic TxFIFO */
regval = efm32_getreg(EFM32_USB_HPTXSTS);
/* Extract the number of bytes available in the periodic Tx FIFO. */
avail = ((regval & _OTGFS_HPTXSTS_PTXFSAVL_MASK) >> _OTGFS_HPTXSTS_PTXFSAVL_SHIFT) << 2;
/* Get minimal size packet that can be sent. Something is seriously
* configured wrong if one packet will not fit into the empty Tx FIFO.
*/
DEBUGASSERT(chan->buflen > 0 &&
avail >= MIN(chan->buflen, chan->maxpacket));
/* Get the size to put in the Tx FIFO now */
wrsize = chan->buflen;
if (wrsize > avail)
{
/* Clip the write size to the number of full, max sized packets
* that will fit in the Tx FIFO.
*/
unsigned int wrpackets = avail / chan->maxpacket;
wrsize = wrpackets * chan->maxpacket;
}
/* Otherwise, this will be the last packet to be sent in this transaction.
* We now need to disable further PTXFE interrupts.
*/
else
{
efm32_modifyreg(EFM32_USB_GINTMSK, USB_GINT_PTXFE, 0);
}
/* Write the next group of packets into the Tx FIFO */
ullvdbg("HPTXSTS: %08x chidx: %d avail: %d buflen: %d wrsize: %d\n",
regval, chidx, avail, chan->buflen, wrsize);
efm32_gint_wrpacket(priv, chan->buffer, chidx, wrsize);
}
/*******************************************************************************
* Name: efm32_gint_hcisr
*
* Description:
* USB OTG FS host channels interrupt handler
*
*******************************************************************************/
static inline void efm32_gint_hcisr(FAR struct efm32_usbhost_s *priv)
{
uint32_t haint;
uint32_t hcchar;
int i = 0;
/* Read the Host all channels interrupt register and test each bit in the
* register. Each bit i, i=0...(EFM32_NHOST_CHANNELS-1), corresponds to
* a pending interrupt on channel i.
*/
haint = efm32_getreg(EFM32_USB_HAINT);
for (i = 0; i < EFM32_NHOST_CHANNELS; i++)
{
/* Is an interrupt pending on this channel? */
if ((haint & OTGFS_HAINT(i)) != 0)
{
/* Yes... read the HCCHAR register to get the direction bit */
hcchar = efm32_getreg(EFM32_USB_HCCHAR(i));
/* Was this an interrupt on an IN or an OUT channel? */
if ((hcchar & OTGFS_HCCHAR_EPDIR) != 0)
{
/* Handle the HC IN channel interrupt */
efm32_gint_hcinisr(priv, i);
}
else
{
/* Handle the HC OUT channel interrupt */
efm32_gint_hcoutisr(priv, i);
}
}
}
}
/*******************************************************************************
* Name: efm32_gint_hprtisr
*
* Description:
* USB OTG FS host port interrupt handler
*
*******************************************************************************/
static inline void efm32_gint_hprtisr(FAR struct efm32_usbhost_s *priv)
{
uint32_t hprt;
uint32_t newhprt;
uint32_t hcfg;
usbhost_vtrace1(OTGFS_VTRACE1_GINT_HPRT, 0);
/* Read the port status and control register (HPRT) */
hprt = efm32_getreg(EFM32_USB_HPRT);
/* Setup to clear the interrupt bits in GINTSTS by setting the corresponding
* bits in the HPRT. The HCINT interrupt bit is cleared when the appropriate
* status bits in the HPRT register are cleared.
*/
newhprt = hprt & ~(OTGFS_HPRT_PENA | OTGFS_HPRT_PCDET |
OTGFS_HPRT_PENCHNG | OTGFS_HPRT_POCCHNG);
/* Check for Port Overcurrent CHaNGe (POCCHNG) */
if ((hprt & OTGFS_HPRT_POCCHNG) != 0)
{
/* Set up to clear the POCCHNG status in the new HPRT contents. */
usbhost_vtrace1(OTGFS_VTRACE1_GINT_HPRT_POCCHNG, 0);
newhprt |= OTGFS_HPRT_POCCHNG;
}
/* Check for Port Connect DETected (PCDET). The core sets this bit when a
* device connection is detected.
*/
if ((hprt & OTGFS_HPRT_PCDET) != 0)
{
/* Set up to clear the PCDET status in the new HPRT contents. Then
* process the new connection event.
*/
usbhost_vtrace1(OTGFS_VTRACE1_GINT_HPRT_PCDET, 0);
newhprt |= OTGFS_HPRT_PCDET;
efm32_portreset(priv);
efm32_gint_connected(priv);
}
/* Check for Port Enable CHaNGed (PENCHNG) */
if ((hprt & OTGFS_HPRT_PENCHNG) != 0)
{
/* Set up to clear the PENCHNG status in the new HPRT contents. */
usbhost_vtrace1(OTGFS_VTRACE1_GINT_HPRT_PENCHNG, 0);
newhprt |= OTGFS_HPRT_PENCHNG;
/* Was the port enabled? */
if ((hprt & OTGFS_HPRT_PENA) != 0)
{
/* Yes.. handle the new connection event */
efm32_gint_connected(priv);
/* Check the Host ConFiGuration register (HCFG) */
hcfg = efm32_getreg(EFM32_USB_HCFG);
/* Is this a low speed or full speed connection (OTG FS does not
* support high speed)
*/
if ((hprt & _OTGFS_HPRT_PSPD_MASK) == OTGFS_HPRT_PSPD_LS)
{
/* Set the Host Frame Interval Register for the 6KHz speed */
usbhost_vtrace1(OTGFS_VTRACE1_GINT_HPRT_LSDEV, 0);
efm32_putreg(EFM32_USB_HFIR, 6000);
/* Are we switching from FS to LS? */
if ((hcfg & _OTGFS_HCFG_FSLSPCS_MASK) != OTGFS_HCFG_FSLSPCS_LS6MHz)
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_HPRT_FSLSSW, 0);
/* Yes... configure for LS */
hcfg &= ~_OTGFS_HCFG_FSLSPCS_MASK;
hcfg |= OTGFS_HCFG_FSLSPCS_LS6MHz;
efm32_putreg(EFM32_USB_HCFG, hcfg);
/* And reset the port */
efm32_portreset(priv);
}
}
else /* if ((hprt & _OTGFS_HPRT_PSPD_MASK) == OTGFS_HPRT_PSPD_FS) */
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_HPRT_FSDEV, 0);
efm32_putreg(EFM32_USB_HFIR, 48000);
/* Are we switching from LS to FS? */
if ((hcfg & _OTGFS_HCFG_FSLSPCS_MASK) != OTGFS_HCFG_FSLSPCS_FS48MHz)
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_HPRT_LSFSSW, 0);
/* Yes... configure for FS */
hcfg &= ~_OTGFS_HCFG_FSLSPCS_MASK;
hcfg |= OTGFS_HCFG_FSLSPCS_FS48MHz;
efm32_putreg(EFM32_USB_HCFG, hcfg);
/* And reset the port */
efm32_portreset(priv);
}
}
}
}
/* Clear port interrupts by setting bits in the HPRT */
efm32_putreg(EFM32_USB_HPRT, newhprt);
}
/*******************************************************************************
* Name: efm32_gint_discisr
*
* Description:
* USB OTG FS disconnect detected interrupt handler
*
*******************************************************************************/
static inline void efm32_gint_discisr(FAR struct efm32_usbhost_s *priv)
{
/* Handle the disconnection event */
efm32_gint_disconnected(priv);
/* Clear the dicsonnect interrupt */
efm32_putreg(EFM32_USB_GINTSTS, USB_GINT_DISC);
}
/*******************************************************************************
* Name: efm32_gint_ipxfrisr
*
* Description:
* USB OTG FS incomplete periodic interrupt handler
*
*******************************************************************************/
static inline void efm32_gint_ipxfrisr(FAR struct efm32_usbhost_s *priv)
{
uint32_t regval;
/* CHENA : Set to enable the channel
* CHDIS : Set to stop transmitting/receiving data on a channel
*/
regval = efm32_getreg(EFM32_USB_HCCHAR(0));
regval |= (OTGFS_HCCHAR_CHDIS | OTGFS_HCCHAR_CHENA);
efm32_putreg(EFM32_USB_HCCHAR(0), regval);
/* Clear the incomplete isochronous OUT interrupt */
efm32_putreg(EFM32_USB_GINTSTS, USB_GINT_IPXFR);
}
/*******************************************************************************
* Name: efm32_gint_isr
*
* Description:
* USB OTG FS global interrupt handler
*
*******************************************************************************/
static int efm32_gint_isr(int irq, FAR void *context)
{
/* At present, there is only support for a single OTG FS host. Hence it is
* pre-allocated as g_usbhost. However, in most code, the private data
* structure will be referenced using the 'priv' pointer (rather than the
* global data) in order to simplify any future support for multiple devices.
*/
FAR struct efm32_usbhost_s *priv = &g_usbhost;
uint32_t pending;
/* If OTG were supported, we would need to check if we are in host or
* device mode when the global interrupt occurs. Here we support only
* host mode
*/
/* Loop while there are pending interrupts to process. This loop may save a
* little interrupt handling overhead.
*/
for (;;)
{
/* Get the unmasked bits in the GINT status */
pending = efm32_getreg(EFM32_USB_GINTSTS);
pending &= efm32_getreg(EFM32_USB_GINTMSK);
/* Return from the interrupt when there are no furhter pending
* interrupts.
*/
if (pending == 0)
{
return OK;
}
/* Otherwise, process each pending, unmasked GINT interrupts */
/* Handle the start of frame interrupt */
#ifdef CONFIG_EFM32_OTGFS_SOFINTR
if ((pending & USB_GINT_SOF) != 0)
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_SOF, 0);
efm32_gint_sofisr(priv);
}
#endif
/* Handle the RxFIFO non-empty interrupt */
if ((pending & USB_GINT_RXFLVL) != 0)
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_RXFLVL, 0);
efm32_gint_rxflvlisr(priv);
}
/* Handle the non-periodic TxFIFO empty interrupt */
if ((pending & USB_GINT_NPTXFE) != 0)
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_NPTXFE, 0);
efm32_gint_nptxfeisr(priv);
}
/* Handle the periodic TxFIFO empty interrupt */
if ((pending & USB_GINT_PTXFE) != 0)
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_PTXFE, 0);
efm32_gint_ptxfeisr(priv);
}
/* Handle the host channels interrupt */
if ((pending & USB_GINT_HC) != 0)
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_HC, 0);
efm32_gint_hcisr(priv);
}
/* Handle the host port interrupt */
if ((pending & USB_GINT_HPRT) != 0)
{
efm32_gint_hprtisr(priv);
}
/* Handle the disconnect detected interrupt */
if ((pending & USB_GINT_DISC) != 0)
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_DISC, 0);
efm32_gint_discisr(priv);
}
/* Handle the incomplete periodic transfer */
if ((pending & USB_GINT_IPXFR) != 0)
{
usbhost_vtrace1(OTGFS_VTRACE1_GINT_IPXFR, 0);
efm32_gint_ipxfrisr(priv);
}
}
/* We won't get here */
return OK;
}
/*******************************************************************************
* Name: efm32_gint_enable and efm32_gint_disable
*
* Description:
* Respectively enable or disable the global OTG FS interrupt.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
*******************************************************************************/
static void efm32_gint_enable(void)
{
uint32_t regval;
/* Set the GINTMSK bit to unmask the interrupt */
regval = efm32_getreg(EFM32_USB_GAHBCFG);
regval |= USB_GAHBCFG_GINTMSK;
efm32_putreg(EFM32_USB_GAHBCFG, regval);
}
static void efm32_gint_disable(void)
{
uint32_t regval;
/* Clear the GINTMSK bit to mask the interrupt */
regval = efm32_getreg(EFM32_USB_GAHBCFG);
regval &= ~USB_GAHBCFG_GINTMSK;
efm32_putreg(EFM32_USB_GAHBCFG, regval);
}
/*******************************************************************************
* Name: efm32_hostinit_enable
*
* Description:
* Enable host interrupts.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
*******************************************************************************/
static inline void efm32_hostinit_enable(void)
{
uint32_t regval;
/* Disable all interrupts. */
efm32_putreg(EFM32_USB_GINTMSK, 0);
/* Clear any pending interrupts. */
efm32_putreg(EFM32_USB_GINTSTS, 0xffffffff);
/* Clear any pending USB OTG Interrupts (should be done elsewhere if OTG is supported) */
efm32_putreg(EFM32_USB_GOTGINT, 0xffffffff);
/* Clear any pending USB OTG interrupts */
efm32_putreg(EFM32_USB_GINTSTS, 0xbfffffff);
/* Enable the host interrupts */
/* Common interrupts:
*
* USB_GINT_WKUP : Resume/remote wakeup detected interrupt
* USB_GINT_USBSUSP : USB suspend
*/
regval = (USB_GINT_WKUP | USB_GINT_USBSUSP);
/* If OTG were supported, we would need to enable the following as well:
*
* USB_GINT_OTG : OTG interrupt
* USB_GINT_SRQ : Session request/new session detected interrupt
* USB_GINT_CIDSCHG : Connector ID status change
*/
/* Host-specific interrupts
*
* USB_GINT_SOF : Start of frame
* USB_GINT_RXFLVL : RxFIFO non-empty
* USB_GINT_IISOOXFR : Incomplete isochronous OUT transfer
* USB_GINT_HPRT : Host port interrupt
* USB_GINT_HC : Host channels interrupt
* USB_GINT_DISC : Disconnect detected interrupt
*/
#ifdef CONFIG_EFM32_OTGFS_SOFINTR
regval |= (USB_GINT_SOF | USB_GINT_RXFLVL | USB_GINT_IISOOXFR |
USB_GINT_HPRT | USB_GINT_HC | USB_GINT_DISC);
#else
regval |= (USB_GINT_RXFLVL | USB_GINT_IPXFR | USB_GINT_HPRT |
USB_GINT_HC | USB_GINT_DISC);
#endif
efm32_putreg(EFM32_USB_GINTMSK, regval);
}
/*******************************************************************************
* Name: efm32_txfe_enable
*
* Description:
* Enable Tx FIFO empty interrupts. This is necessary when the entire
* transfer will not fit into Tx FIFO. The transfer will then be completed
* when the Tx FIFO is empty. NOTE: The Tx FIFO interrupt is disabled
* the fifo empty interrupt handler when the transfer is complete.
*
* Input Parameters:
* priv - Driver state structure reference
* chidx - The channel that requires the Tx FIFO empty interrupt
*
* Returned Value:
* None
*
* Assumptions:
* Called from user task context. Interrupts must be disabled to assure
* exclusive access to the GINTMSK register.
*
*******************************************************************************/
static void efm32_txfe_enable(FAR struct efm32_usbhost_s *priv, int chidx)
{
FAR struct efm32_chan_s *chan = &priv->chan[chidx];
irqstate_t flags;
uint32_t regval;
/* Disable all interrupts so that we have exclusive access to the GINTMSK
* (it would be sufficent just to disable the GINT interrupt).
*/
flags = irqsave();
/* Should we enable the periodic or non-peridic Tx FIFO empty interrupts */
regval = efm32_getreg(EFM32_USB_GINTMSK);
switch (chan->eptype)
{
default:
case OTGFS_EPTYPE_CTRL: /* Non periodic transfer */
case OTGFS_EPTYPE_BULK:
regval |= USB_GINT_NPTXFE;
break;
case OTGFS_EPTYPE_INTR: /* Periodic transfer */
case OTGFS_EPTYPE_ISOC:
regval |= USB_GINT_PTXFE;
break;
}
/* Enable interrupts */
efm32_putreg(EFM32_USB_GINTMSK, regval);
irqrestore(flags);
}
/*******************************************************************************
* USB Host Controller Operations
*******************************************************************************/
/*******************************************************************************
* Name: efm32_wait
*
* Description:
* Wait for a device to be connected or disconneced.
*
* Input Parameters:
* conn - The USB host connection instance obtained as a parameter from the call to
* the USB driver initialization logic.
* connected - A pointer to a boolean value. TRUE: Wait for device to be
* connected; FALSE: wait for device to be disconnected
*
* Returned Values:
* Zero (OK) is returned when a device in connected. This function will not
* return until either (1) a device is connected or (2) some failure occurs.
* On a failure, a negated errno value is returned indicating the nature of
* the failure
*
* Assumptions:
* - Called from a single thread so no mutual exclusion is required.
* - Never called from an interrupt handler.
*
*******************************************************************************/
static int efm32_wait(FAR struct usbhost_connection_s *conn,
FAR const bool *connected)
{
FAR struct efm32_usbhost_s *priv = &g_usbhost;
irqstate_t flags;
/* Are we already connected? */
flags = irqsave();
while (priv->connected == *connected)
{
/* No... wait for the connection/disconnection */
priv->eventwait = true;
efm32_takesem(&priv->eventsem);
}
irqrestore(flags);
udbg("Connected:%s\n", priv->connected ? "YES" : "NO");
return OK;
}
/*******************************************************************************
* Name: efm32_enumerate
*
* Description:
* Enumerate the connected device. As part of this enumeration process,
* the driver will (1) get the device's configuration descriptor, (2)
* extract the class ID info from the configuration descriptor, (3) call
* usbhost_findclass() to find the class that supports this device, (4)
* call the create() method on the struct usbhost_registry_s interface
* to get a class instance, and finally (5) call the configdesc() method
* of the struct usbhost_class_s interface. After that, the class is in
* charge of the sequence of operations.
*
* Input Parameters:
* conn - The USB host connection instance obtained as a parameter from the call to
* the USB driver initialization logic.
* rphndx - Root hub port index. 0-(n-1) corresponds to root hub port 1-n.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* - Only a single class bound to a single device is supported.
* - Called from a single thread so no mutual exclusion is required.
* - Never called from an interrupt handler.
*
*******************************************************************************/
static int efm32_enumerate(FAR struct usbhost_connection_s *conn, int rhpndx)
{
FAR struct efm32_usbhost_s *priv = &g_usbhost;
uint32_t regval;
int chidx;
int ret;
DEBUGASSERT(priv && rhpndx == 0);
/* Are we connected to a device? The caller should have called the wait()
* method first to be assured that a device is connected.
*/
while (!priv->connected)
{
/* No, return an error */
usbhost_trace1(OTGFS_TRACE1_DEVDISCONN,0);
return -ENODEV;
}
DEBUGASSERT(priv->smstate == SMSTATE_ATTACHED);
/* Allocate and initialize the control OUT channel */
chidx = efm32_chan_alloc(priv);
DEBUGASSERT(chidx >= 0);
priv->ep0out = chidx;
priv->chan[chidx].epno = 0;
priv->chan[chidx].in = false;
priv->chan[chidx].eptype = OTGFS_EPTYPE_CTRL;
priv->chan[chidx].maxpacket = EFM32_EP0_DEF_PACKET_SIZE;
priv->chan[chidx].indata1 = false;
priv->chan[chidx].outdata1 = false;
/* Allocate and initialize the control IN channel */
chidx = efm32_chan_alloc(priv);
DEBUGASSERT(chidx >= 0);
priv->ep0in = chidx;
priv->chan[chidx].epno = 0;
priv->chan[chidx].in = true;
priv->chan[chidx].eptype = OTGFS_EPTYPE_CTRL;
priv->chan[chidx].maxpacket = EFM32_EP0_DEF_PACKET_SIZE;
priv->chan[chidx].indata1 = false;
priv->chan[chidx].outdata1 = false;
/* USB 2.0 spec says at least 50ms delay before port reset. We wait 100ms. */
usleep(100*1000);
/* Reset the host port */
efm32_portreset(priv);
/* Get the current device speed */
regval = efm32_getreg(EFM32_USB_HPRT);
priv->lowspeed = ((regval & _OTGFS_HPRT_PSPD_MASK) == OTGFS_HPRT_PSPD_LS);
/* Configure control channels */
efm32_chan_configure(priv, priv->ep0out);
efm32_chan_configure(priv, priv->ep0in);
/* Let the common usbhost_enumerate do all of the real work. Note that the
* FunctionAddress (USB address) is hardcoded to one.
*/
uvdbg("Enumerate the device\n");
priv->smstate = SMSTATE_ENUM;
ret = usbhost_enumerate(&g_usbhost.drvr, 1, &priv->class);
/* The enumeration may fail either because of some HCD interfaces failure
* or because the device class is not supported. In either case, we just
* need to perform the disconnection operation and make ready for a new
* enumeration.
*/
if (ret < 0)
{
/* Return to the disconnected state */
efm32_gint_disconnected(priv);
}
return ret;
}
/************************************************************************************
* Name: efm32_ep0configure
*
* Description:
* Configure endpoint 0. This method is normally used internally by the
* enumerate() method but is made available at the interface to support an
* external implementation of the enumeration logic.
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* funcaddr - The USB address of the function containing the endpoint that EP0
* controls
* maxpacketsize - The maximum number of bytes that can be sent to or
* received from the endpoint in a single data packet
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
************************************************************************************/
static int efm32_ep0configure(FAR struct usbhost_driver_s *drvr, uint8_t funcaddr,
uint16_t maxpacketsize)
{
FAR struct efm32_usbhost_s *priv = (FAR struct efm32_usbhost_s *)drvr;
DEBUGASSERT(drvr && funcaddr < 128 && maxpacketsize < 2048);
/* We must have exclusive access to the USB host hardware and state structures */
efm32_takesem(&priv->exclsem);
/* Save the device address and EP0 max packet size */
priv->devaddr = funcaddr;
priv->ep0size = maxpacketsize;
/* Configure the EP0 OUT channel */
priv->chan[priv->ep0out].maxpacket = maxpacketsize;
efm32_chan_configure(priv, priv->ep0out);
/* Configure the EP0 IN channel */
priv->chan[priv->ep0in].maxpacket = maxpacketsize;
efm32_chan_configure(priv, priv->ep0in);
efm32_givesem(&priv->exclsem);
return OK;
}
/************************************************************************************
* Name: efm32_getdevinfo
*
* Description:
* Get information about the connected device.
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* devinfo - A pointer to memory provided by the caller in which to return the
* device information.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
************************************************************************************/
static int efm32_getdevinfo(FAR struct usbhost_driver_s *drvr,
FAR struct usbhost_devinfo_s *devinfo)
{
FAR struct efm32_usbhost_s *priv = (FAR struct efm32_usbhost_s *)drvr;
DEBUGASSERT(drvr && devinfo);
devinfo->speed = priv->lowspeed ? DEVINFO_SPEED_LOW : DEVINFO_SPEED_FULL;
return OK;
}
/************************************************************************************
* Name: efm32_epalloc
*
* Description:
* Allocate and configure one endpoint.
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* epdesc - Describes the endpoint to be allocated.
* ep - A memory location provided by the caller in which to receive the
* allocated endpoint descriptor.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
************************************************************************************/
static int efm32_epalloc(FAR struct usbhost_driver_s *drvr,
FAR const struct usbhost_epdesc_s *epdesc,
FAR usbhost_ep_t *ep)
{
FAR struct efm32_usbhost_s *priv = (FAR struct efm32_usbhost_s *)drvr;
FAR struct efm32_chan_s *chan;
int chidx;
int ret;
/* Sanity check. NOTE that this method should only be called if a device is
* connected (because we need a valid low speed indication).
*/
DEBUGASSERT(priv && epdesc && ep && priv->connected);
/* We must have exclusive access to the USB host hardware and state structures */
efm32_takesem(&priv->exclsem);
/* Allocate a host channel for the endpoint */
chidx = efm32_chan_alloc(priv);
if (chidx < 0)
{
udbg("Failed to allocate a host channel\n");
ret = -ENOMEM;
goto errout;
}
/* Decode the endpoint descriptor to initialize the channel data structures.
* Note: Here we depend on the fact that the endpoint point type is
* encoded in the same way in the endpoint descriptor as it is in the OTG
* FS hardware.
*/
chan = &priv->chan[chidx];
chan->epno = epdesc->addr & USB_EPNO_MASK;
chan->in = epdesc->in;
chan->eptype = epdesc->xfrtype;
chan->maxpacket = epdesc->mxpacketsize;
chan->indata1 = false;
chan->outdata1 = false;
/* Then configure the endpoint */
efm32_chan_configure(priv, chidx);
/* Return the index to the allocated channel as the endpoint "handle" */
*ep = (usbhost_ep_t)chidx;
ret = OK;
errout:
efm32_givesem(&priv->exclsem);
return ret;
}
/************************************************************************************
* Name: efm32_epfree
*
* Description:
* Free and endpoint previously allocated by DRVR_EPALLOC.
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* ep - The endpoint to be freed.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
************************************************************************************/
static int efm32_epfree(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
{
struct efm32_usbhost_s *priv = (struct efm32_usbhost_s *)drvr;
int chidx = (int)ep;
DEBUGASSERT(priv && chidx < EFM32_MAX_TX_FIFOS);
/* We must have exclusive access to the USB host hardware and state structures */
efm32_takesem(&priv->exclsem);
/* Halt the channel and mark the channel avaiable */
efm32_chan_free(priv, chidx);
efm32_givesem(&priv->exclsem);
return OK;
}
/*******************************************************************************
* Name: efm32_alloc
*
* Description:
* Some hardware supports special memory in which request and descriptor data can
* be accessed more efficiently. This method provides a mechanism to allocate
* the request/descriptor memory. If the underlying hardware does not support
* such "special" memory, this functions may simply map to kmm_malloc.
*
* This interface was optimized under a particular assumption. It was assumed
* that the driver maintains a pool of small, pre-allocated buffers for descriptor
* traffic. NOTE that size is not an input, but an output: The size of the
* pre-allocated buffer is returned.
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* buffer - The address of a memory location provided by the caller in which to
* return the allocated buffer memory address.
* maxlen - The address of a memory location provided by the caller in which to
* return the maximum size of the allocated buffer memory.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* - Called from a single thread so no mutual exclusion is required.
* - Never called from an interrupt handler.
*
*******************************************************************************/
static int efm32_alloc(FAR struct usbhost_driver_s *drvr,
FAR uint8_t **buffer, FAR size_t *maxlen)
{
FAR uint8_t *alloc;
DEBUGASSERT(drvr && buffer && maxlen);
/* There is no special memory requirement for the EFM32. */
alloc = (FAR uint8_t *)kmm_malloc(CONFIG_EFM32_OTGFS_DESCSIZE);
if (!alloc)
{
return -ENOMEM;
}
/* Return the allocated address and size of the descriptor buffer */
*buffer = alloc;
*maxlen = CONFIG_EFM32_OTGFS_DESCSIZE;
return OK;
}
/*******************************************************************************
* Name: efm32_free
*
* Description:
* Some hardware supports special memory in which request and descriptor data can
* be accessed more efficiently. This method provides a mechanism to free that
* request/descriptor memory. If the underlying hardware does not support
* such "special" memory, this functions may simply map to kmm_free().
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* buffer - The address of the allocated buffer memory to be freed.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* - Never called from an interrupt handler.
*
*******************************************************************************/
static int efm32_free(FAR struct usbhost_driver_s *drvr, FAR uint8_t *buffer)
{
/* There is no special memory requirement */
DEBUGASSERT(drvr && buffer);
kmm_free(buffer);
return OK;
}
/************************************************************************************
* Name: efm32_ioalloc
*
* Description:
* Some hardware supports special memory in which larger IO buffers can
* be accessed more efficiently. This method provides a mechanism to allocate
* the request/descriptor memory. If the underlying hardware does not support
* such "special" memory, this functions may simply map to kmm_malloc.
*
* This interface differs from DRVR_ALLOC in that the buffers are variable-sized.
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* buffer - The address of a memory location provided by the caller in which to
* return the allocated buffer memory address.
* buflen - The size of the buffer required.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
************************************************************************************/
static int efm32_ioalloc(FAR struct usbhost_driver_s *drvr,
FAR uint8_t **buffer, size_t buflen)
{
FAR uint8_t *alloc;
DEBUGASSERT(drvr && buffer && buflen > 0);
/* There is no special memory requirement */
alloc = (FAR uint8_t *)kmm_malloc(buflen);
if (!alloc)
{
return -ENOMEM;
}
/* Return the allocated buffer */
*buffer = alloc;
return OK;
}
/************************************************************************************
* Name: efm32_iofree
*
* Description:
* Some hardware supports special memory in which IO data can be accessed more
* efficiently. This method provides a mechanism to free that IO buffer
* memory. If the underlying hardware does not support such "special" memory,
* this functions may simply map to kmm_free().
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* buffer - The address of the allocated buffer memory to be freed.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
************************************************************************************/
static int efm32_iofree(FAR struct usbhost_driver_s *drvr, FAR uint8_t *buffer)
{
/* There is no special memory requirement */
DEBUGASSERT(drvr && buffer);
kmm_free(buffer);
return OK;
}
/*******************************************************************************
* Name: efm32_ctrlin and efm32_ctrlout
*
* Description:
* Process a IN or OUT request on the control endpoint. These methods
* will enqueue the request and wait for it to complete. Only one transfer may be
* queued; Neither these methods nor the transfer() method can be called again
* until the control transfer functions returns.
*
* These are blocking methods; these functions will not return until the
* control transfer has completed.
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* req - Describes the request to be sent. This request must lie in memory
* created by DRVR_ALLOC.
* buffer - A buffer used for sending the request and for returning any
* responses. This buffer must be large enough to hold the length value
* in the request description. buffer must have been allocated using DRVR_ALLOC
*
* NOTE: On an IN transaction, req and buffer may refer to the same allocated
* memory.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* - Only a single class bound to a single device is supported.
* - Called from a single thread so no mutual exclusion is required.
* - Never called from an interrupt handler.
*
*******************************************************************************/
static int efm32_ctrlin(FAR struct usbhost_driver_s *drvr,
FAR const struct usb_ctrlreq_s *req,
FAR uint8_t *buffer)
{
struct efm32_usbhost_s *priv = (struct efm32_usbhost_s *)drvr;
uint16_t buflen;
uint32_t start;
uint32_t elapsed;
int retries;
int ret;
DEBUGASSERT(drvr && req);
usbhost_vtrace2(OTGFS_VTRACE2_CTRLIN, req->type, req->req);
uvdbg("type:%02x req:%02x value:%02x%02x index:%02x%02x len:%02x%02x\n",
req->type, req->req, req->value[1], req->value[0],
req->index[1], req->index[0], req->len[1], req->len[0]);
/* Extract values from the request */
buflen = efm32_getle16(req->len);
/* We must have exclusive access to the USB host hardware and state structures */
efm32_takesem(&priv->exclsem);
/* Loop, retrying until the retry time expires */
for (retries = 0; retries < EFM32_RETRY_COUNT; retries++)
{
/* Send the SETUP request */
ret = efm32_ctrl_sendsetup(priv, req);
if (ret < 0)
{
usbhost_trace1(OTGFS_TRACE1_SENDSETUP, -ret);
continue;
}
/* Get the start time. Loop again until the timeout expires */
start = clock_systimer();
do
{
/* Handle the IN data phase (if any) */
if (buflen > 0)
{
ret = efm32_ctrl_recvdata(priv, buffer, buflen);
if (ret < 0)
{
usbhost_trace1(OTGFS_TRACE1_RECVDATA, -ret);
}
}
/* Handle the status OUT phase */
if (ret == OK)
{
priv->chan[priv->ep0out].outdata1 ^= true;
ret = efm32_ctrl_senddata(priv, NULL, 0);
if (ret == OK)
{
/* All success transactions exit here */
efm32_givesem(&priv->exclsem);
return OK;
}
usbhost_trace1(OTGFS_TRACE1_SENDDATA, ret < 0 ? -ret : ret);
}
/* Get the elapsed time (in frames) */
elapsed = clock_systimer() - start;
}
while (elapsed < EFM32_DATANAK_DELAY);
}
/* All failures exit here after all retries and timeouts have been exhausted */
efm32_givesem(&priv->exclsem);
return -ETIMEDOUT;
}
static int efm32_ctrlout(FAR struct usbhost_driver_s *drvr,
FAR const struct usb_ctrlreq_s *req,
FAR const uint8_t *buffer)
{
struct efm32_usbhost_s *priv = (struct efm32_usbhost_s *)drvr;
uint16_t buflen;
uint32_t start;
uint32_t elapsed;
int retries;
int ret;
DEBUGASSERT(drvr && req);
usbhost_vtrace2(OTGFS_VTRACE2_CTRLOUT, req->type, req->req);
uvdbg("type:%02x req:%02x value:%02x%02x index:%02x%02x len:%02x%02x\n",
req->type, req->req, req->value[1], req->value[0],
req->index[1], req->index[0], req->len[1], req->len[0]);
/* Extract values from the request */
buflen = efm32_getle16(req->len);
/* We must have exclusive access to the USB host hardware and state structures */
efm32_takesem(&priv->exclsem);
/* Loop, retrying until the retry time expires */
for (retries = 0; retries < EFM32_RETRY_COUNT; retries++)
{
/* Send the SETUP request */
/* Send the SETUP request */
ret = efm32_ctrl_sendsetup(priv, req);
if (ret < 0)
{
usbhost_trace1(OTGFS_TRACE1_SENDSETUP, -ret);
continue;
}
/* Get the start time. Loop again until the timeout expires */
start = clock_systimer();
do
{
/* Handle the data OUT phase (if any) */
if (buflen > 0)
{
/* Start DATA out transfer (only one DATA packet) */
priv->chan[priv->ep0out].outdata1 = true;
ret = efm32_ctrl_senddata(priv, NULL, 0);
if (ret < 0)
{
usbhost_trace1(OTGFS_TRACE1_SENDDATA, -ret);
}
}
/* Handle the status IN phase */
if (ret == OK)
{
ret = efm32_ctrl_recvdata(priv, NULL, 0);
if (ret == OK)
{
/* All success transactins exit here */
efm32_givesem(&priv->exclsem);
return OK;
}
usbhost_trace1(OTGFS_TRACE1_RECVDATA, ret < 0 ? -ret : ret);
}
/* Get the elapsed time (in frames) */
elapsed = clock_systimer() - start;
}
while (elapsed < EFM32_DATANAK_DELAY);
}
/* All failures exit here after all retries and timeouts have been exhausted */
efm32_givesem(&priv->exclsem);
return -ETIMEDOUT;
}
/*******************************************************************************
* Name: efm32_transfer
*
* Description:
* Process a request to handle a transfer descriptor. This method will
* enqueue the transfer request and return immediately. Only one transfer may be
* queued; Neither this method nor the ctrlin or ctrlout methods can be called
* again until this function returns.
*
* This is a blocking method; this functions will not return until the
* transfer has completed.
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* ep - The IN or OUT endpoint descriptor for the device endpoint on which to
* perform the transfer.
* buffer - A buffer containing the data to be sent (OUT endpoint) or received
* (IN endpoint). buffer must have been allocated using DRVR_ALLOC
* buflen - The length of the data to be sent or received.
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure:
*
* EAGAIN - If devices NAKs the transfer (or NYET or other error where
* it may be appropriate to restart the entire transaction).
* EPERM - If the endpoint stalls
* EIO - On a TX or data toggle error
* EPIPE - Overrun errors
*
* Assumptions:
* - Only a single class bound to a single device is supported.
* - Called from a single thread so no mutual exclusion is required.
* - Never called from an interrupt handler.
*
*******************************************************************************/
static int efm32_transfer(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep,
FAR uint8_t *buffer, size_t buflen)
{
FAR struct efm32_usbhost_s *priv = (FAR struct efm32_usbhost_s *)drvr;
unsigned int chidx = (unsigned int)ep;
int ret;
uvdbg("chidx: %d buflen: %d\n", (unsigned int)ep, buflen);
DEBUGASSERT(priv && buffer && chidx < EFM32_MAX_TX_FIFOS && buflen > 0);
/* We must have exclusive access to the USB host hardware and state structures */
efm32_takesem(&priv->exclsem);
/* Handle IN and OUT transfer slightly differently */
if (priv->chan[chidx].in)
{
ret = efm32_in_transfer(priv, chidx, buffer, buflen);
}
else
{
ret = efm32_out_transfer(priv, chidx, buffer, buflen);
}
efm32_givesem(&priv->exclsem);
return ret;
}
/*******************************************************************************
* Name: efm32_disconnect
*
* Description:
* Called by the class when an error occurs and driver has been disconnected.
* The USB host driver should discard the handle to the class instance (it is
* stale) and not attempt any further interaction with the class driver instance
* (until a new instance is received from the create() method). The driver
* should not called the class' disconnected() method.
*
* Input Parameters:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
*
* Returned Values:
* None
*
* Assumptions:
* - Only a single class bound to a single device is supported.
* - Never called from an interrupt handler.
*
*******************************************************************************/
static void efm32_disconnect(FAR struct usbhost_driver_s *drvr)
{
struct efm32_usbhost_s *priv = (struct efm32_usbhost_s *)drvr;
DEBUGASSERT(priv);
priv->class = NULL;
}
/*******************************************************************************
* Initialization
*******************************************************************************/
/*******************************************************************************
* Name: efm32_portreset
*
* Description:
* Reset the USB host port.
*
* NOTE: "Before starting to drive a USB reset, the application waits for the
* OTG interrupt triggered by the debounce done bit (DBCDNE bit in
* OTG_FS_GOTGINT), which indicates that the bus is stable again after the
* electrical debounce caused by the attachment of a pull-up resistor on DP
* (FS) or DM (LS).
*
* Input Parameters:
* priv -- USB host driver private data structure.
*
* Returned Value:
* None
*
*******************************************************************************/
static void efm32_portreset(FAR struct efm32_usbhost_s *priv)
{
uint32_t regval;
regval = efm32_getreg(EFM32_USB_HPRT);
regval &= ~(OTGFS_HPRT_PENA|OTGFS_HPRT_PCDET|OTGFS_HPRT_PENCHNG|OTGFS_HPRT_POCCHNG);
regval |= OTGFS_HPRT_PRST;
efm32_putreg(EFM32_USB_HPRT, regval);
up_mdelay(20);
regval &= ~OTGFS_HPRT_PRST;
efm32_putreg(EFM32_USB_HPRT, regval);
up_mdelay(20);
}
/*******************************************************************************
* Name: efm32_flush_txfifos
*
* Description:
* Flush the selected Tx FIFO.
*
* Input Parameters:
* txfnum -- USB host driver private data structure.
*
* Returned Value:
* None.
*
*******************************************************************************/
static void efm32_flush_txfifos(uint32_t txfnum)
{
uint32_t regval;
uint32_t timeout;
/* Initiate the TX FIFO flush operation */
regval = USB_GRSTCTL_TXFFLSH | txfnum;
efm32_putreg(regval, EFM32_USB_GRSTCTL);
/* Wait for the FLUSH to complete */
for (timeout = 0; timeout < EFM32_FLUSH_DELAY; timeout++)
{
regval = efm32_getreg(EFM32_USB_GRSTCTL);
if ((regval & USB_GRSTCTL_TXFFLSH) == 0)
{
break;
}
}
/* Wait for 3 PHY Clocks */
up_udelay(3);
}
/*******************************************************************************
* Name: efm32_flush_rxfifo
*
* Description:
* Flush the Rx FIFO.
*
* Input Parameters:
* priv -- USB host driver private data structure.
*
* Returned Value:
* None.
*
*******************************************************************************/
static void efm32_flush_rxfifo(void)
{
uint32_t regval;
uint32_t timeout;
/* Initiate the RX FIFO flush operation */
efm32_putreg(USB_GRSTCTL_RXFFLSH, EFM32_USB_GRSTCTL);
/* Wait for the FLUSH to complete */
for (timeout = 0; timeout < EFM32_FLUSH_DELAY; timeout++)
{
regval = efm32_getreg(EFM32_USB_GRSTCTL);
if ((regval & USB_GRSTCTL_RXFFLSH) == 0)
{
break;
}
}
/* Wait for 3 PHY Clocks */
up_udelay(3);
}
/*******************************************************************************
* Name: efm32_vbusdrive
*
* Description:
* Drive the Vbus +5V.
*
* Input Parameters:
* priv - USB host driver private data structure.
* state - True: Drive, False: Don't drive
*
* Returned Value:
* None.
*
*******************************************************************************/
static void efm32_vbusdrive(FAR struct efm32_usbhost_s *priv, bool state)
{
uint32_t regval;
/* Enable/disable the external charge pump */
efm32_usbhost_vbusdrive(0, state);
/* Turn on the Host port power. */
regval = efm32_getreg(EFM32_USB_HPRT);
regval &= ~(OTGFS_HPRT_PENA|OTGFS_HPRT_PCDET|OTGFS_HPRT_PENCHNG|OTGFS_HPRT_POCCHNG);
if (((regval & OTGFS_HPRT_PPWR) == 0) && state)
{
regval |= OTGFS_HPRT_PPWR;
efm32_putreg(EFM32_USB_HPRT, regval);
}
if (((regval & OTGFS_HPRT_PPWR) != 0) && !state)
{
regval &= ~OTGFS_HPRT_PPWR;
efm32_putreg(EFM32_USB_HPRT, regval);
}
up_mdelay(200);
}
/*******************************************************************************
* Name: efm32_host_initialize
*
* Description:
* Initialize/re-initialize hardware for host mode operation. At present,
* this function is called only from efm32_hw_initialize(). But if OTG mode
* were supported, this function would also be called to swtich between
* host and device modes on a connector ID change interrupt.
*
* Input Parameters:
* priv -- USB host driver private data structure.
*
* Returned Value:
* None.
*
*******************************************************************************/
static void efm32_host_initialize(FAR struct efm32_usbhost_s *priv)
{
uint32_t regval;
uint32_t offset;
int i;
/* Restart the PHY Clock */
efm32_putreg(EFM32_USB_PCGCCTL, 0);
/* Initialize Host Configuration (HCFG) register */
regval = efm32_getreg(EFM32_USB_HCFG);
regval &= ~_OTGFS_HCFG_FSLSPCS_MASK;
regval |= OTGFS_HCFG_FSLSPCS_FS48MHz;
efm32_putreg(EFM32_USB_HCFG, regval);
/* Reset the host port */
efm32_portreset(priv);
/* Clear the FS-/LS-only support bit in the HCFG register */
regval = efm32_getreg(EFM32_USB_HCFG);
regval &= ~OTGFS_HCFG_FSLSS;
efm32_putreg(EFM32_USB_HCFG, regval);
/* Carve up FIFO memory for the Rx FIFO and the periodic and non-periodic Tx FIFOs */
/* Configure Rx FIFO size (GRXFSIZ) */
efm32_putreg(EFM32_USB_GRXFSIZ, CONFIG_EFM32_OTGFS_RXFIFO_SIZE);
offset = CONFIG_EFM32_OTGFS_RXFIFO_SIZE;
/* Setup the host non-periodic Tx FIFO size (HNPTXFSIZ) */
regval = (offset | (CONFIG_EFM32_OTGFS_NPTXFIFO_SIZE << _OTGFS_HNPTXFSIZ_NPTXFD_SHIFT));
efm32_putreg(EFM32_USB_HNPTXFSIZ, regval);
offset += CONFIG_EFM32_OTGFS_NPTXFIFO_SIZE;
/* Set up the host periodic Tx fifo size register (HPTXFSIZ) */
regval = (offset | (CONFIG_EFM32_OTGFS_PTXFIFO_SIZE << _OTGFS_HPTXFSIZ_PTXFD_SHIFT));
efm32_putreg(EFM32_USB_HPTXFSIZ, regval);
/* If OTG were supported, we sould need to clear HNP enable bit in the
* USB_OTG control register about here.
*/
/* Flush all FIFOs */
efm32_flush_txfifos(USB_GRSTCTL_TXFNUM_HALL);
efm32_flush_rxfifo();
/* Clear all pending HC Interrupts */
for (i = 0; i < EFM32_NHOST_CHANNELS; i++)
{
efm32_putreg(EFM32_USB_HCINT(i), 0xffffffff);
efm32_putreg(EFM32_USB_HCINTMSK(i), 0);
}
/* Driver Vbus +5V (the smoke test). Should be done elsewhere in OTG
* mode.
*/
efm32_vbusdrive(priv, true);
/* Enable host interrupts */
efm32_hostinit_enable();
}
/*******************************************************************************
* Name: efm32_sw_initialize
*
* Description:
* One-time setup of the host driver state structure.
*
* Input Parameters:
* priv -- USB host driver private data structure.
*
* Returned Value:
* None.
*
*******************************************************************************/
static inline void efm32_sw_initialize(FAR struct efm32_usbhost_s *priv)
{
int i;
/* Initialize the state data structure */
sem_init(&priv->eventsem, 0, 0);
sem_init(&priv->exclsem, 0, 1);
priv->smstate = SMSTATE_DETACHED;
priv->ep0size = EFM32_EP0_MAX_PACKET_SIZE;
priv->devaddr = EFM32_DEF_DEVADDR;
priv->connected = false;
priv->lowspeed = false;
/* Put all of the channels back in their initial, allocated state */
memset(priv->chan, 0, EFM32_MAX_TX_FIFOS * sizeof(struct efm32_chan_s));
/* Initialize each channel */
for (i = 0; i < EFM32_MAX_TX_FIFOS; i++)
{
FAR struct efm32_chan_s *chan = &priv->chan[i];
sem_init(&chan->waitsem, 0, 0);
}
}
/*******************************************************************************
* Name: efm32_hw_initialize
*
* Description:
* One-time setup of the host controller harware for normal operations.
*
* Input Parameters:
* priv -- USB host driver private data structure.
*
* Returned Value:
* Zero on success; a negated errno value on failure.
*
*******************************************************************************/
static inline int efm32_hw_initialize(FAR struct efm32_usbhost_s *priv)
{
uint32_t regval;
unsigned long timeout;
/* "To initialize the core as host, the application must perform the
* following steps.
* 1. Program USB_GINTMSK.PRTINT to unmask.
* 2. Program the USB_HCFG register to select full-speed host.
* 3. Program the USB_HPRT.PRTPWR bit to 1. This drives VBUS on the USB.
* 4. Wait for the USB_HPRT.PRTCONNDET interrupt. This indicates that a
* device is connect to the port.
* 5. Program the USB_HPRT.PRTRST bit to 1. This starts the reset process.
* 6. Wait at least 10 ms for the reset process to complete.
* 7. Program the USB_HPRT.PRTRST bit to 0.
* 8. Wait for the USB_HPRT.PRTENCHNG interrupt.
* 9. Read the USB_HPRT.PRTSPD field to get the enumerated speed.
* 10. Program the USB_HFIR register with a value corresponding to the
* selected PHY clock. At this point, the host is up and running and
* the port register begins to report device disconnects, etc. The
* port is active with SOFs occurring down the enabled port.
* 11. Program the RXFSIZE register to select the size of the receive FIFO.
* 12. Program the NPTXFSIZE register to select the size and the start
* address of the Non-periodic Transmit FIFO for non-periodic
* transactions.
* 13. Program the USB_HPTXFSIZ register to select the size and start
* address of the Periodic Transmit FIFO for periodic transactions."
*/
#warning Review for missing logic
/* Set the PHYSEL bit in the GUSBCFG register to select the OTG FS serial
* transceiver: "This bit is always 1 with write-only access"
*/
regval = efm32_getreg(EFM32_USB_GUSBCFG);;
regval |= USB_GUSBCFG_PHYSEL;
efm32_putreg(EFM32_USB_GUSBCFG, regval);
/* Reset after a PHY select and set Host mode. First, wait for AHB master
* IDLE state.
*/
for (timeout = 0; timeout < EFM32_READY_DELAY; timeout++)
{
up_udelay(3);
regval = efm32_getreg(EFM32_USB_GRSTCTL);
if ((regval & USB_GRSTCTL_AHBIDL) != 0)
{
break;
}
}
/* Then perform the core soft reset. */
efm32_putreg(EFM32_USB_GRSTCTL, USB_GRSTCTL_CSRST);
for (timeout = 0; timeout < EFM32_READY_DELAY; timeout++)
{
regval = efm32_getreg(EFM32_USB_GRSTCTL);
if ((regval & USB_GRSTCTL_CSRST) == 0)
{
break;
}
}
/* Wait for 3 PHY Clocks */
up_udelay(3);
/* Deactivate the power down */
regval = (USB_GCCFG_PWRDWN | USB_GCCFG_VBUSASEN | USB_GCCFG_VBUSBSEN);
#ifndef CONFIG_USBDEV_VBUSSENSING
regval |= USB_GCCFG_NOVBUSSENS;
#endif
#ifdef CONFIG_EFM32_OTGFS_SOFOUTPUT
regval |= USB_GCCFG_SOFOUTEN;
#endif
efm32_putreg(EFM32_USB_GCCFG, regval);
up_mdelay(20);
/* Initialize OTG features: In order to support OTP, the HNPCAP and SRPCAP
* bits would need to be set in the GUSBCFG register about here.
*/
/* Force Host Mode */
regval = efm32_getreg(EFM32_USB_GUSBCFG);
regval &= ~USB_GUSBCFG_FDMOD;
regval |= USB_GUSBCFG_FHMOD;
efm32_putreg(EFM32_USB_GUSBCFG, regval);
up_mdelay(50);
/* Initialize host mode and return success */
efm32_host_initialize(priv);
return OK;
}
/*******************************************************************************
* Public Functions
*******************************************************************************/
/*******************************************************************************
* Name: efm32_otgfshost_initialize
*
* Description:
* Initialize USB host device controller hardware.
*
* Input Parameters:
* controller -- If the device supports more than USB host controller, then
* this identifies which controller is being initialized. Normally, this
* is just zero.
*
* Returned Value:
* And instance of the USB host interface. The controlling task should
* use this interface to (1) call the wait() method to wait for a device
* to be connected, and (2) call the enumerate() method to bind the device
* to a class driver.
*
* Assumptions:
* - This function should called in the initialization sequence in order
* to initialize the USB device functionality.
* - Class drivers should be initialized prior to calling this function.
* Otherwise, there is a race condition if the device is already connected.
*
*******************************************************************************/
FAR struct usbhost_connection_s *efm32_otgfshost_initialize(int controller)
{
/* At present, there is only support for a single OTG FS host. Hence it is
* pre-allocated as g_usbhost. However, in most code, the private data
* structure will be referenced using the 'priv' pointer (rather than the
* global data) in order to simplify any future support for multiple devices.
*/
FAR struct efm32_usbhost_s *priv = &g_usbhost;
/* Sanity checks */
DEBUGASSERT(controller == 0);
/* "The USB requires the device to run from a 48 MHz crystal (2500 ppm or
* better). The core part of the USB will always run from HFCORECLKUSBC
* which is HFCLK undivided (48 MHz). The current consumption for the
* rest of the device can be reduced by dividing down HFCORECLK using
* the CMU_HFCORECLKDIV register. ..."
*
* "Follow these steps to enable the USB:
* 1. Enable the clock to the system part by setting USB in
* CMU_HFCORECLKEN0.
* 2. If the internal USB regulator is bypassed (by applying 3.3V on
* USB_VREGI and USB_VREGO externally), disable the regulator by
* setting VREGDIS in USB_CTRL.
* 3. If the PHY is powered from VBUS using the internal regulator, the
* VREGO sense circuit should be enabled by setting VREGOSEN in
* USB_CTRL.
* 4. Enable the USB PHY pins by setting PHYPEN in USB_ROUTE.
* 5. If host or OTG dual-role device, set VBUSENAP in USB_CTRL to the
* desired value and then enable the USB_VBUSEN pin in USB_ROUTE. Set
* the MODE for the pin to PUSHPULL.
* 6. If low-speed device, set DMPUAP in USB_CTRL to the desired value
* and then enable the USB_DMPU pin in USB_ROUTE. Set the MODE for the
* pin to PUSHPULL.
* 7. Make sure HFXO is ready and selected. The core part requires the
* undivided HFCLK to be 48 MHz when USB is active (during
* suspend/session-off a 32 kHz clock is used)..
* 8. Enable the clock to the core part by setting USBC in
* CMU_HFCORECLKEN0.
* 9. Wait for the core to come out of reset. This is easiest done by
* polling a core register with non-zero reset value until it reads a
* non-zero value. This takes approximately 20 48-MHz cycles.
* 10. Start initializing the USB core ..."
*/
#warning Missing Logic
/* Make sure that interrupts from the OTG FS core are disabled */
efm32_gint_disable();
/* Reset the state of the host driver */
efm32_sw_initialize(priv);
/* Initialize the USB OTG FS core */
efm32_hw_initialize(priv);
/* Attach USB host controller interrupt handler */
if (irq_attach(EFM32_IRQ_USB, efm32_gint_isr) != 0)
{
usbhost_trace1(OTGFS_TRACE1_IRQATTACH, 0);
return NULL;
}
/* Enable USB OTG FS global interrupts */
efm32_gint_enable();
/* Enable interrupts at the interrupt controller */
up_enable_irq(EFM32_IRQ_USB);
return &g_usbconn;
}
#endif /* CONFIG_USBHOST && CONFIG_EFM32_OTGFS */
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