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nuttx/arch/arm/src/sama5/sam_hsmci.c

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/****************************************************************************
* arch/arm/src/sama5/sam_hsmci.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: 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 <stdint.h>
#include <stdbool.h>
#include <semaphore.h>
#include <string.h>
#include <assert.h>
#include <debug.h>
#include <wdog.h>
#include <errno.h>
#include <nuttx/clock.h>
#include <nuttx/arch.h>
#include <nuttx/sdio.h>
#include <nuttx/wqueue.h>
#include <nuttx/mmcsd.h>
#include <arch/irq.h>
#include <arch/board/board.h>
#include "chip.h"
#include "up_arch.h"
#include "sam_pio.h"
#include "sam_dmac.h"
#include "sam_periphclks.h"
#include "sam_memories.h"
#include "sam_hsmci.h"
#include "chip/sam_dmac.h"
#include "chip/sam_pmc.h"
#include "chip/sam_hsmci.h"
#include "chip/sam_pinmap.h"
#if defined(CONFIG_SAMA5_HSMCI0) || defined(CONFIG_SAMA5_HSMCI1) || \
defined(CONFIG_SAMA5_HSMCI2)
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#if defined(ATSAMA5D3)
/* The SAMA5D3 has three HSMCI blocks: HSMCI0-2. HSMCI0 requires DMAC0
* support, HSMCI1-2 require DMAC1 support.
*/
# define HSMCI0_DMAC 0
# define HSMCI1_DMAC 1
# define HSMCI2_DMAC 1
# if defined(CONFIG_SAMA5_HSMCI0) && !defined(CONFIG_SAMA5_DMAC0)
# error "HSMCI0 support requires CONFIG_SAMA5_DMAC0"
# endif
# if defined(CONFIG_SAMA5_HSMCI1) && !defined(CONFIG_SAMA5_DMAC1)
# error "HSMCI1 support requires CONFIG_SAMA5_DMAC1"
# endif
# if defined(CONFIG_SAMA5_HSMCI2) && !defined(CONFIG_SAMA5_DMAC1)
# error "HSMCI2 support requires CONFIG_SAMA5_DMAC1"
# endif
/* System Bus Interfaces */
# define HSMCI_SYSBUS_IF DMACH_FLAG_PERIPHAHB_AHB_IF2
# define MEMORY_SYSBUS_IF DMACH_FLAG_MEMAHB_AHB_IF0
#elif defined(ATSAMA5D4)
/* The SAMA5D3 has two HSMCI blocks: HSMCI0-1. They can be driven
* either by XDMAC0 (secure) or XDMAC1 (unsecure).
*/
# if !defined(CONFIG_SAMA5_XDMAC0) && !defined(CONFIG_SAMA5_XDMAC1)
# error HSMCI0/1 require CONFIG_SAMA5_XDMAC0 and/or CONFIG_SAMA5_XDMAC1
# endif
/* If both XDMAC blocks are enabled, then we have to select which
* used by each HSMCI block.
*/
# if defined(CONFIG_SAMA5_HSMCI0)
# if defined(CONFIG_SAMA5_HSMCI0_XDMAC0) && defined(CONFIG_SAMA5_XDMAC0)
# define HSMCI0_DMAC 0
# elif defined(CONFIG_SAMA5_HSMCI0_XDMAC1) && defined(CONFIG_SAMA5_XDMAC1)
# define HSMCI0_DMAC 1
# else
# error No valid DMA configuration for HSMCI0
# endif
# endif
# if defined(CONFIG_SAMA5_HSMCI1)
# if defined(CONFIG_SAMA5_HSMCI1_XDMAC0) && defined(CONFIG_SAMA5_XDMAC0)
# define HSMCI1_DMAC 0
# elif defined(CONFIG_SAMA5_HSMCI0_XDMAC1) && defined(CONFIG_SAMA5_XDMAC1)
# define HSMCI1_DMAC 1
# else
# error No valid DMA configuration for HSMCI1
# endif
# endif
/* System Bus Interfaces
*
* HSMCI0 is on H32MX, APB1; HSMCI1 is on H32MX, APB0. Both are
* accessible on MATRIX IF1.
*
* Memory is available on either port 5 (IF0 for both XDMAC0 and 1) or
* port 6 (IF1 for both XDMAC0 and 1).
*/
# define HSMCI_SYSBUS_IF DMACH_FLAG_PERIPHAHB_AHB_IF1
# define MEMORY_SYSBUS_IF DMACH_FLAG_MEMAHB_AHB_IF0
#else
# error Unrecognized SAMA5 architecture
#endif
#ifndef CONFIG_SCHED_WORKQUEUE
# error "Callback support requires CONFIG_SCHED_WORKQUEUE"
#endif
#ifndef CONFIG_SDIO_BLOCKSETUP
# error "This driver requires CONFIG_SDIO_BLOCKSETUP"
#endif
#if !defined(CONFIG_DEBUG_FS) || !defined(CONFIG_DEBUG_VERBOSE)
# undef CONFIG_SAMA5_HSMCI_CMDDEBUG
# undef CONFIG_SAMA5_HSMCI_XFRDEBUG
#endif
#ifdef CONFIG_SAMA5_HSMCI_RDPROOF
# ifdef CONFIG_SAMA5_HSMCI_WRPROOF
# define HSMCU_PROOF_BITS (HSMCI_MR_RDPROOF | HSMCI_MR_WRPROOF)
# else
# define HSMCU_PROOF_BITS HSMCI_MR_RDPROOF
# endif
#else
# ifdef CONFIG_SAMA5_HSMCI_WRPROOF
# define HSMCU_PROOF_BITS HSMCI_MR_WRPROOF
# else
# define HSMCU_PROOF_BITS (0)
# endif
#endif
/* There is some unresolved issue with the SAMA5D3 DMA. TX DMA is currently
* disabled.
*/
#undef HSCMI_NORXDMA /* Define to disable RX DMA */
#undef HSCMI_NOTXDMA /* Define to disable TX DMA */
#ifdef ATSAMA5D3
# define HSCMI_NOTXDMA 1 /* Disabled */
#endif
/* Timing */
#define HSMCI_CMDTIMEOUT (100000)
#define HSMCI_LONGTIMEOUT (0x7fffffff)
/* Big DTIMER setting */
#define HSMCI_DTIMER_DATATIMEOUT (0x000fffff)
/* DMA configuration flags */
#define HSMCI_DMA_CHKSIZE HSMCI_DMA_CHKSIZE_1
#define DMA_FLAGS(pid) \
(DMACH_FLAG_PERIPHPID(pid) | HSMCI_SYSBUS_IF | \
DMACH_FLAG_PERIPHH2SEL | DMACH_FLAG_PERIPHISPERIPH | \
DMACH_FLAG_PERIPHWIDTH_32BITS | DMACH_FLAG_PERIPHCHUNKSIZE_1 | \
DMACH_FLAG_MEMPID_MAX | MEMORY_SYSBUS_IF | \
DMACH_FLAG_MEMWIDTH_32BITS | DMACH_FLAG_MEMINCREMENT | \
DMACH_FLAG_MEMCHUNKSIZE_4 | DMACH_FLAG_MEMBURST_1)
/* Status errors:
*
* HSMCI_INT_UNRE Data transmit underrun
* HSMCI_INT_OVRE Data receive overrun
* HSMCI_INT_BLKOVRE DMA receive block overrun error
* HSMCI_INT_CSTOE Completion signal time-out error (see HSMCI_CSTOR)
* HSMCI_INT_DTOE Data time-out error (see HSMCI_DTOR)
* HSMCI_INT_DCRCE Data CRC Error
* HSMCI_INT_RTOE Response Time-out
* HSMCI_INT_RENDE Response End Bit Error
* HSMCI_INT_RCRCE Response CRC Error
* HSMCI_INT_RDIRE Response Direction Error
* HSMCI_INT_RINDE Response Index Error
*/
#define HSMCI_STATUS_ERRORS \
( HSMCI_INT_UNRE | HSMCI_INT_OVRE | HSMCI_INT_BLKOVRE | HSMCI_INT_CSTOE | \
HSMCI_INT_DTOE | HSMCI_INT_DCRCE | HSMCI_INT_RTOE | HSMCI_INT_RENDE | \
HSMCI_INT_RCRCE | HSMCI_INT_RDIRE | HSMCI_INT_RINDE )
/* Response errors:
*
* HSMCI_INT_CSTOE Completion signal time-out error (see HSMCI_CSTOR)
* HSMCI_INT_RTOE Response Time-out
* HSMCI_INT_RENDE Response End Bit Error
* HSMCI_INT_RCRCE Response CRC Error
* HSMCI_INT_RDIRE Response Direction Error
* HSMCI_INT_RINDE Response Index Error
*/
#define HSMCI_RESPONSE_ERRORS \
( HSMCI_INT_CSTOE | HSMCI_INT_RTOE | HSMCI_INT_RENDE | HSMCI_INT_RCRCE | \
HSMCI_INT_RDIRE | HSMCI_INT_RINDE )
#define HSMCI_RESPONSE_NOCRC_ERRORS \
( HSMCI_INT_CSTOE | HSMCI_INT_RTOE | HSMCI_INT_RENDE | HSMCI_INT_RDIRE | \
HSMCI_INT_RINDE )
#define HSMCI_RESPONSE_TIMEOUT_ERRORS \
( HSMCI_INT_CSTOE | HSMCI_INT_RTOE )
/* Data transfer errors:
*
* HSMCI_INT_UNRE Data transmit underrun
* HSMCI_INT_OVRE Data receive overrun
* HSMCI_INT_BLKOVRE DMA receive block overrun error
* HSMCI_INT_CSTOE Completion signal time-out error (see HSMCI_CSTOR)
* HSMCI_INT_DTOE Data time-out error (see HSMCI_DTOR)
* HSMCI_INT_DCRCE Data CRC Error
*/
#define HSMCI_DATA_ERRORS \
( HSMCI_INT_UNRE | HSMCI_INT_OVRE | HSMCI_INT_BLKOVRE | HSMCI_INT_CSTOE | \
HSMCI_INT_DTOE | HSMCI_INT_DCRCE )
#define HSMCI_DATA_TIMEOUT_ERRORS \
( HSMCI_INT_CSTOE | HSMCI_INT_DTOE )
#define HSMCI_DATA_RECV_ERRORS \
( HSMCI_INT_OVRE | HSMCI_INT_BLKOVRE | HSMCI_INT_CSTOE | HSMCI_INT_DTOE | \
HSMCI_INT_DCRCE )
#define HSMCI_DATA_DMASEND_ERRORS \
( HSMCI_INT_UNRE | HSMCI_INT_CSTOE | HSMCI_INT_DTOE | HSMCI_INT_DCRCE )
/* Data transfer status and interrupt mask bits.
*
* The XFRDONE flag in the HSMCI_SR indicates exactly when the read or
* write sequence is finished.
*
* 0: A transfer is in progress.
* 1: Command register is ready to operate and the data bus is in the idle state.
*
* DMADONE: DMA Transfer done
*
* 0: DMA buffer transfer has not completed since the last read of HSMCI_SR register.
* 1: DMA buffer transfer has completed.
*/
#define HSMCI_RECV_INTS \
( HSMCI_DATA_RECV_ERRORS | HSMCI_INT_RXRDY)
#define HSMCI_DMARECV_INTS \
( HSMCI_DATA_RECV_ERRORS | HSMCI_INT_XFRDONE /* | HSMCI_INT_DMADONE */ )
#define HSMCI_DMASEND_INTS \
( HSMCI_DATA_DMASEND_ERRORS | HSMCI_INT_XFRDONE /* | HSMCI_INT_DMADONE */ )
/* Event waiting interrupt mask bits.
*
* CMDRDY (Command Ready):
*
* 0: A command is in progress
* 1: The last command has been sent. The CMDRDY flag is released 8 bits
* after the end of the card response. Cleared when writing in the HSMCI_CMDR
*/
#define HSMCI_CMDRESP_INTS \
( HSMCI_RESPONSE_ERRORS | HSMCI_INT_CMDRDY )
#define HSMCI_CMDRESP_NOCRC_INTS \
( HSMCI_RESPONSE_NOCRC_ERRORS | HSMCI_INT_CMDRDY )
/* Register logging support */
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
# ifdef CONFIG_DEBUG_DMA
# define SAMPLENDX_BEFORE_SETUP 0
# define SAMPLENDX_BEFORE_ENABLE 1
# define SAMPLENDX_AFTER_SETUP 2
# define SAMPLENDX_END_TRANSFER 3
# define SAMPLENDX_DMA_CALLBACK 4
# define SAMPLENDX_TIMEOUT 5
# define DEBUG_NDMASAMPLES 6
# else
# define SAMPLENDX_BEFORE_SETUP 0
# define SAMPLENDX_AFTER_SETUP 1
# define SAMPLENDX_END_TRANSFER 2
# define SAMPLENDX_TIMEOUT 3
# define DEBUG_NDMASAMPLES 4
# endif
#endif
#ifdef CONFIG_SAMA5_HSMCI_CMDDEBUG
# define SAMPLENDX_AFTER_CMDR 0
# define SAMPLENDX_AT_WAKEUP 1
# define DEBUG_NCMDSAMPLES 2
#endif
/* Some semi-standard definitions */
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
/****************************************************************************
* Private Types
****************************************************************************/
/* Register logging support */
#if defined(CONFIG_SAMA5_HSMCI_XFRDEBUG) || defined(CONFIG_SAMA5_HSMCI_CMDDEBUG)
struct sam_hsmciregs_s
{
uint32_t mr; /* Mode Register */
uint32_t dtor; /* Data Timeout Register */
uint32_t sdcr; /* SD/SDIO Card Register */
uint32_t argr; /* Argument Register */
uint32_t blkr; /* Block Register */
uint32_t cstor; /* Completion Signal Timeout Register */
uint32_t rsp0; /* Response Register 0 */
uint32_t rsp1; /* Response Register 1 */
uint32_t rsp2; /* Response Register 2 */
uint32_t rsp3; /* Response Register 3 */
uint32_t sr; /* Status Register */
uint32_t imr; /* Interrupt Mask Register */
uint32_t dma; /* DMA Configuration Register */
uint32_t cfg; /* Configuration Register */
uint32_t wpmr; /* Write Protection Mode Register */
uint32_t wpsr; /* Write Protection Status Register */
};
#endif
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
struct sam_xfrregs_s
{
struct sam_hsmciregs_s hsmci;
#ifdef CONFIG_DEBUG_DMA
struct sam_dmaregs_s dma;
#endif
};
#endif
/* This structure defines the state of the SAMA5 HSMCI interface */
struct sam_dev_s
{
struct sdio_dev_s dev; /* Standard, base SDIO interface */
/* SAMA5-specific extensions */
/* Event support */
sem_t waitsem; /* Implements event waiting */
sdio_eventset_t waitevents; /* Set of events to be waited for */
uint32_t base; /* HSMCI register base address */
uint32_t waitmask; /* Interrupt enables for event waiting */
uint32_t cmdrmask; /* Interrupt enables for this particular cmd/response */
volatile sdio_eventset_t wkupevent; /* The event that caused the wakeup */
WDOG_ID waitwdog; /* Watchdog that handles event timeouts */
uint8_t hsmci; /* HSMCI (0, 1, or 2) */
volatile bool dmabusy; /* TRUE: DMA transfer is in progress */
volatile bool xfrbusy; /* TRUE: Transfer is in progress */
volatile bool txbusy; /* TRUE: TX transfer is in progress (for delay calculation) */
/* Callback support */
uint8_t cdstatus; /* Card status */
sdio_eventset_t cbevents; /* Set of events to be cause callbacks */
worker_t callback; /* Registered callback function */
void *cbarg; /* Registered callback argument */
struct work_s cbwork; /* Callback work queue structure */
/* Interrupt mode data transfer support */
uint32_t xfrmask; /* Interrupt enables for data transfer */
/* Interrupt mode data transfer support */
uint32_t *buffer; /* Address of current R/W buffer */
ssize_t remaining; /* Number of bytes remaining in the transfer */
/* DMA data transfer support */
bool widebus; /* Required for DMA support */
DMA_HANDLE dma; /* Handle for DMA channel */
/* Debug stuff */
#ifdef CONFIG_SAMA5_HSMCI_REGDEBUG
bool wrlast; /* Last was a write */
uint32_t addrlast; /* Last address */
uint32_t vallast; /* Last value */
int ntimes; /* Number of times */
#endif
/* Register logging support */
#if defined(CONFIG_SAMA5_HSMCI_CMDDEBUG) && defined(CONFIG_SAMA5_HSMCI_XFRDEBUG)
bool xfrinitialized;
bool cmdinitialized;
#endif
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
uint8_t smplset;
struct sam_xfrregs_s xfrsamples[DEBUG_NDMASAMPLES];
#endif
#ifdef CONFIG_SAMA5_HSMCI_CMDDEBUG
struct sam_hsmciregs_s cmdsamples[DEBUG_NCMDSAMPLES];
#endif
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Low-level helpers ********************************************************/
static void sam_takesem(struct sam_dev_s *priv);
#define sam_givesem(priv) (sem_post(&priv->waitsem))
#ifdef CONFIG_SAMA5_HSMCI_REGDEBUG
static bool sam_checkreg(struct sam_dev_s *priv, bool wr,
uint32_t value, uint32_t address);
#else
# define sam_checkreg(priv,wr,value,address) (false)
#endif
static inline uint32_t sam_getreg(struct sam_dev_s *priv,
unsigned int offset);
static inline void sam_putreg(struct sam_dev_s *priv, uint32_t value,
unsigned int offset);
static inline void sam_configwaitints(struct sam_dev_s *priv, uint32_t waitmask,
sdio_eventset_t waitevents);
static void sam_disablewaitints(struct sam_dev_s *priv, sdio_eventset_t wkupevent);
static inline void sam_configxfrints(struct sam_dev_s *priv, uint32_t xfrmask);
static void sam_disablexfrints(struct sam_dev_s *priv);
static inline void sam_enableints(struct sam_dev_s *priv);
static inline void sam_disable(struct sam_dev_s *priv);
static inline void sam_enable(struct sam_dev_s *priv);
/* Register Sampling ********************************************************/
#if defined(CONFIG_SAMA5_HSMCI_XFRDEBUG) || defined(CONFIG_SAMA5_HSMCI_CMDDEBUG)
static void sam_hsmcisample(struct sam_dev_s *priv,
struct sam_hsmciregs_s *regs);
static void sam_hsmcidump(struct sam_dev_s *priv,
struct sam_hsmciregs_s *regs, const char *msg);
#endif
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
static void sam_xfrsampleinit(struct sam_dev_s *priv);
static void sam_xfrsample(struct sam_dev_s *priv, int index);
static void sam_xfrdumpone(struct sam_dev_s *priv, int index,
const char *msg);
static void sam_xfrdump(struct sam_dev_s *priv);
#else
# define sam_xfrsampleinit(priv)
# define sam_xfrsample(priv,index)
# define sam_xfrdump(priv)
#endif
#ifdef CONFIG_SAMA5_HSMCI_CMDDEBUG
static void sam_cmdsampleinit(struct sam_dev_s *priv);
static inline void sam_cmdsample1(struct sam_dev_s *priv, int index3);
static inline void sam_cmdsample2(struct sam_dev_s *priv, int index,
uint32_t sr);
static void sam_cmddump(struct sam_dev_s *priv);
#else
# define sam_cmdsampleinit(priv)
# define sam_cmdsample1(priv,index)
# define sam_cmdsample2(priv,index,sr)
# define sam_cmddump(priv)
#endif
/* DMA Helpers **************************************************************/
static void sam_dmacallback(DMA_HANDLE handle, void *arg, int result);
static inline uintptr_t hsmci_physregaddr(struct sam_dev_s *priv,
unsigned int offset);
/* Data Transfer Helpers ****************************************************/
static void sam_eventtimeout(int argc, uint32_t arg);
static void sam_endwait(struct sam_dev_s *priv, sdio_eventset_t wkupevent);
static void sam_endtransfer(struct sam_dev_s *priv, sdio_eventset_t wkupevent);
static void sam_notransfer(struct sam_dev_s *priv);
/* Interrupt Handling *******************************************************/
static int sam_hsmci_interrupt(struct sam_dev_s *priv);
#ifdef CONFIG_SAMA5_HSMCI0
static int sam_hsmci0_interrupt(int irq, void *context);
#endif
#ifdef CONFIG_SAMA5_HSMCI1
static int sam_hsmci1_interrupt(int irq, void *context);
#endif
#ifdef CONFIG_SAMA5_HSMCI2
static int sam_hsmci2_interrupt(int irq, void *context);
#endif
/* SDIO interface methods ***************************************************/
/* Initialization/setup */
static void sam_reset(FAR struct sdio_dev_s *dev);
static uint8_t sam_status(FAR struct sdio_dev_s *dev);
static void sam_widebus(FAR struct sdio_dev_s *dev, bool enable);
static void sam_clock(FAR struct sdio_dev_s *dev,
enum sdio_clock_e rate);
static int sam_attach(FAR struct sdio_dev_s *dev);
/* Command/Status/Data Transfer */
static int sam_sendcmd(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t arg);
static void sam_blocksetup(FAR struct sdio_dev_s *dev, unsigned int blocklen,
unsigned int nblocks);
static int sam_recvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer,
size_t nbytes);
static int sam_sendsetup(FAR struct sdio_dev_s *dev, FAR const uint8_t *buffer,
size_t nbytes);
static int sam_cancel(FAR struct sdio_dev_s *dev);
static int sam_waitresponse(FAR struct sdio_dev_s *dev, uint32_t cmd);
static int sam_recvshort(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t *rshort);
static int sam_recvlong(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t rlong[4]);
static int sam_recvnotimpl(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t *rnotimpl);
/* EVENT handler */
static void sam_waitenable(FAR struct sdio_dev_s *dev,
sdio_eventset_t eventset);
static sdio_eventset_t
sam_eventwait(FAR struct sdio_dev_s *dev, uint32_t timeout);
static void sam_callbackenable(FAR struct sdio_dev_s *dev,
sdio_eventset_t eventset);
static int sam_registercallback(FAR struct sdio_dev_s *dev,
worker_t callback, void *arg);
/* DMA */
#ifdef CONFIG_SDIO_DMA
static bool sam_dmasupported(FAR struct sdio_dev_s *dev);
#endif
#ifndef HSCMI_NORXDMA
static int sam_dmarecvsetup(FAR struct sdio_dev_s *dev,
FAR uint8_t *buffer, size_t buflen);
#endif
#ifndef HSCMI_NOTXDMA
static int sam_dmasendsetup(FAR struct sdio_dev_s *dev,
FAR const uint8_t *buffer, size_t buflen);
#endif
/* Initialization/uninitialization/reset ************************************/
static void sam_callback(void *arg);
/****************************************************************************
* Private Data
****************************************************************************/
/* Callbacks */
static const struct sdio_dev_s g_callbacks =
{
.reset = sam_reset,
.status = sam_status,
.widebus = sam_widebus,
.clock = sam_clock,
.attach = sam_attach,
.sendcmd = sam_sendcmd,
.blocksetup = sam_blocksetup,
.recvsetup = sam_recvsetup,
.sendsetup = sam_sendsetup,
.cancel = sam_cancel,
.waitresponse = sam_waitresponse,
.recvR1 = sam_recvshort,
.recvR2 = sam_recvlong,
.recvR3 = sam_recvshort,
.recvR4 = sam_recvnotimpl,
.recvR5 = sam_recvnotimpl,
.recvR6 = sam_recvshort,
.recvR7 = sam_recvshort,
.waitenable = sam_waitenable,
.eventwait = sam_eventwait,
.callbackenable = sam_callbackenable,
.registercallback = sam_registercallback,
#ifdef CONFIG_SDIO_DMA
.dmasupported = sam_dmasupported,
#ifndef HSCMI_NORXDMA
.dmarecvsetup = sam_dmarecvsetup,
#else
.dmarecvsetup = sam_recvsetup,
#endif
#ifndef HSCMI_NOTXDMA
.dmasendsetup = sam_dmasendsetup,
#else
.dmasendsetup = sam_sendsetup,
#endif
#endif
};
/* Pre-allocate memory for each HSMCI device */
#ifdef CONFIG_SAMA5_HSMCI0
static struct sam_dev_s g_hsmci0;
#endif
#ifdef CONFIG_SAMA5_HSMCI1
static struct sam_dev_s g_hsmci1;
#endif
#ifdef CONFIG_SAMA5_HSMCI2
static struct sam_dev_s g_hsmci2;
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Low-level Helpers
****************************************************************************/
/****************************************************************************
* Name: sam_takesem
*
* Description:
* Take the wait semaphore (handling false alarm wakeups due to the receipt
* of signals).
*
* Input Parameters:
* dev - Instance of the SDIO device driver state structure.
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_takesem(struct sam_dev_s *priv)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(&priv->waitsem) != 0)
{
/* The only case that an error should occr here is if the wait was
* awakened by a signal.
*/
ASSERT(errno == EINTR);
}
}
/****************************************************************************
* Name: sam_checkreg
*
* Description:
* Check if the current register access is a duplicate of the preceding.
*
* Input Parameters:
* value - The value to be written
* address - The address of the register to write to
*
* Returned Value:
* true: This is the first register access of this type.
* flase: This is the same as the preceding register access.
*
****************************************************************************/
#ifdef CONFIG_SAMA5_HSMCI_REGDEBUG
static bool sam_checkreg(struct sam_dev_s *priv, bool wr, uint32_t value,
uint32_t address)
{
if (wr == priv->wrlast && /* Same kind of access? */
value == priv->vallast && /* Same value? */
address == priv->addrlast) /* Same address? */
{
/* Yes, then just keep a count of the number of times we did this. */
priv->ntimes++;
return false;
}
else
{
/* Did we do the previous operation more than once? */
if (priv->ntimes > 0)
{
/* Yes... show how many times we did it */
lldbg("...[Repeats %d times]...\n", priv->ntimes);
}
/* Save information about the new access */
priv->wrlast = wr;
priv->vallast = value;
priv->addrlast = address;
priv->ntimes = 0;
}
/* Return true if this is the first time that we have done this operation */
return true;
}
#endif
/****************************************************************************
* Name: sam_getreg
*
* Description:
* Read an HSMCI register
*
****************************************************************************/
static inline uint32_t sam_getreg(struct sam_dev_s *priv, unsigned int offset)
{
uint32_t address = priv->base + offset;
uint32_t value = getreg32(address);
#ifdef CONFIG_SAMA5_HSMCI_REGDEBUG
if (sam_checkreg(priv, false, value, address))
{
lldbg("%08x->%08x\n", address, value);
}
#endif
return value;
}
/****************************************************************************
* Name: sam_putreg
*
* Description:
* Write a value to an HSMCI register
*
****************************************************************************/
static inline void sam_putreg(struct sam_dev_s *priv, uint32_t value,
unsigned int offset)
{
uint32_t address = priv->base + offset;
#ifdef CONFIG_SAMA5_HSMCI_REGDEBUG
if (sam_checkreg(priv, true, value, address))
{
lldbg("%08x<-%08x\n", address, value);
}
#endif
putreg32(value, address);
}
/****************************************************************************
* Name: sam_configwaitints
*
* Description:
* Configure HSMCI interrupts needed to support the wait function. Wait
* interrupts are configured here, but not enabled until
* sam_enableints() is called. Why? Because the XFRDONE interrupt
* is always pending until start the data transfer.
*
* Input Parameters:
* priv - A reference to the HSMCI device state structure
* waitmask - The set of bits in the HSMCI MASK register to set
* waitevents - Waited for events
*
* Returned Value:
* None
*
****************************************************************************/
static inline void sam_configwaitints(struct sam_dev_s *priv,
uint32_t waitmask,
sdio_eventset_t waitevents)
{
irqstate_t flags;
/* Save all of the data in one, atomic operation. */
flags = irqsave();
priv->waitevents = waitevents;
priv->wkupevent = 0;
priv->waitmask = waitmask;
irqrestore(flags);
}
/****************************************************************************
* Name: sam_disablewaitints
*
* Description:
* Disable HSMCI interrupts and save wakeup event. Called
*
* Input Parameters:
* priv - A reference to the HSMCI device state structure
* wkupevent - Wake-up event(s)
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_disablewaitints(struct sam_dev_s *priv,
sdio_eventset_t wkupevent)
{
irqstate_t flags;
/* Save all of the data and set the new interrupt mask in one, atomic
* operation.
*/
flags = irqsave();
priv->waitevents = 0;
priv->wkupevent = wkupevent;
priv->waitmask = 0;
sam_putreg(priv, ~priv->xfrmask, SAM_HSMCI_IDR_OFFSET);
irqrestore(flags);
}
/****************************************************************************
* Name: sam_configxfrints
*
* Description:
* Configure HSMCI interrupts needed to support the data transfer. Data
* transfer interrupts are configured here, but not enabled until
* sam_enableints() is called. Why? Because the XFRDONE interrupt
* is always pending until start the data transfer.
*
* Input Parameters:
* priv - A reference to the HSMCI device state structure
* xfrmask - The set of bits in the HSMCI MASK register to set
*
* Returned Value:
* None
*
****************************************************************************/
static inline void sam_configxfrints(struct sam_dev_s *priv, uint32_t xfrmask)
{
priv->xfrmask = xfrmask;
}
/****************************************************************************
* Name: sam_disablexfrints
*
* Description:
* Disable HSMCI interrupts needed to support the data transfer event
*
* Input Parameters:
* priv - A reference to the HSMCI device state structure
* xfrmask - The set of bits in the HSMCI MASK register to set
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_disablexfrints(struct sam_dev_s *priv)
{
irqstate_t flags = irqsave();
priv->xfrmask = 0;
sam_putreg(priv, ~priv->waitmask, SAM_HSMCI_IDR_OFFSET);
irqrestore(flags);
}
/****************************************************************************
* Name: sam_enableints
*
* Description:
* Enable the previously configured HSMCI interrupts needed to suport the
* wait and transfer functions.
*
* Input Parameters:
* priv - A reference to the HSMCI device state structure
*
* Returned Value:
* None
*
****************************************************************************/
static inline void sam_enableints(struct sam_dev_s *priv)
{
/* Enable all interrupts associated with the waited-for event */
sam_putreg(priv, priv->xfrmask | priv->waitmask, SAM_HSMCI_IER_OFFSET);
}
/****************************************************************************
* Name: sam_disable
*
* Description:
* Disable the HSMCI
*
****************************************************************************/
static inline void sam_disable(struct sam_dev_s *priv)
{
/* Disable the MCI */
sam_putreg(priv, HSMCI_CR_MCIDIS, SAM_HSMCI_CR_OFFSET);
/* Disable all the interrupts */
sam_putreg(priv, 0xffffffff, SAM_HSMCI_IDR_OFFSET);
}
/****************************************************************************
* Name: sam_enable
*
* Description:
* Enable the HSMCI
*
****************************************************************************/
static inline void sam_enable(struct sam_dev_s *priv)
{
/* Enable the MCI and the Power Saving */
sam_putreg(priv, HSMCI_CR_MCIEN, SAM_HSMCI_CR_OFFSET);
}
/****************************************************************************
* Register Sampling
****************************************************************************/
/****************************************************************************
* Name: sam_hsmcisample
*
* Description:
* Sample HSMCI registers
*
****************************************************************************/
#if defined(CONFIG_SAMA5_HSMCI_XFRDEBUG) || defined(CONFIG_SAMA5_HSMCI_CMDDEBUG)
static void sam_hsmcisample(struct sam_dev_s *priv,
struct sam_hsmciregs_s *regs)
{
regs->mr = sam_getreg(priv, SAM_HSMCI_MR_OFFSET);
regs->dtor = sam_getreg(priv, SAM_HSMCI_DTOR_OFFSET);
regs->sdcr = sam_getreg(priv, SAM_HSMCI_SDCR_OFFSET);
regs->argr = sam_getreg(priv, SAM_HSMCI_ARGR_OFFSET);
regs->blkr = sam_getreg(priv, SAM_HSMCI_BLKR_OFFSET);
regs->cstor = sam_getreg(priv, SAM_HSMCI_CSTOR_OFFSET);
regs->rsp0 = sam_getreg(priv, SAM_HSMCI_RSPR0_OFFSET);
regs->rsp1 = sam_getreg(priv, SAM_HSMCI_RSPR1_OFFSET);
regs->rsp2 = sam_getreg(priv, SAM_HSMCI_RSPR2_OFFSET);
regs->rsp3 = sam_getreg(priv, SAM_HSMCI_RSPR3_OFFSET);
regs->sr = sam_getreg(priv, SAM_HSMCI_SR_OFFSET);
regs->imr = sam_getreg(priv, SAM_HSMCI_IMR_OFFSET);
regs->dma = sam_getreg(priv, SAM_HSMCI_DMA_OFFSET);
regs->cfg = sam_getreg(priv, SAM_HSMCI_CFG_OFFSET);
regs->wpmr = sam_getreg(priv, SAM_HSMCI_WPMR_OFFSET);
regs->wpsr = sam_getreg(priv, SAM_HSMCI_WPSR_OFFSET);
}
#endif
/****************************************************************************
* Name: sam_hsmcidump
*
* Description:
* Dump one register sample
*
****************************************************************************/
#if defined(CONFIG_SAMA5_HSMCI_XFRDEBUG) || defined(CONFIG_SAMA5_HSMCI_CMDDEBUG)
static void sam_hsmcidump(struct sam_dev_s *priv,
struct sam_hsmciregs_s *regs, const char *msg)
{
fdbg("HSMCI Registers: %s\n", msg);
fdbg(" MR[%08x]: %08x\n", priv->base + SAM_HSMCI_MR_OFFSET, regs->mr);
fdbg(" DTOR[%08x]: %08x\n", priv->base + SAM_HSMCI_DTOR_OFFSET, regs->dtor);
fdbg(" SDCR[%08x]: %08x\n", priv->base + SAM_HSMCI_SDCR_OFFSET, regs->sdcr);
fdbg(" ARGR[%08x]: %08x\n", priv->base + SAM_HSMCI_ARGR_OFFSET, regs->argr);
fdbg(" BLKR[%08x]: %08x\n", priv->base + SAM_HSMCI_BLKR_OFFSET, regs->blkr);
fdbg(" CSTOR[%08x]: %08x\n", priv->base + SAM_HSMCI_CSTOR_OFFSET, regs->cstor);
fdbg(" RSPR0[%08x]: %08x\n", priv->base + SAM_HSMCI_RSPR0_OFFSET, regs->rsp0);
fdbg(" RSPR1[%08x]: %08x\n", priv->base + SAM_HSMCI_RSPR1_OFFSET, regs->rsp1);
fdbg(" RSPR2[%08x]: %08x\n", priv->base + SAM_HSMCI_RSPR2_OFFSET, regs->rsp2);
fdbg(" RSPR3[%08x]: %08x\n", priv->base + SAM_HSMCI_RSPR3_OFFSET, regs->rsp3);
fdbg(" SR[%08x]: %08x\n", priv->base + SAM_HSMCI_SR_OFFSET, regs->sr);
fdbg(" IMR[%08x]: %08x\n", priv->base + SAM_HSMCI_IMR_OFFSET, regs->imr);
fdbg(" DMA[%08x]: %08x\n", priv->base + SAM_HSMCI_DMA_OFFSET, regs->dma);
fdbg(" CFG[%08x]: %08x\n", priv->base + SAM_HSMCI_CFG_OFFSET, regs->cfg);
fdbg(" WPMR[%08x]: %08x\n", priv->base + SAM_HSMCI_WPMR_OFFSET, regs->wpmr);
fdbg(" WPSR[%08x]: %08x\n", priv->base + SAM_HSMCI_WPSR_OFFSET, regs->wpsr);
}
#endif
/****************************************************************************
* Name: sam_xfrsample
*
* Description:
* Sample HSMCI/DMA registers
*
****************************************************************************/
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
static void sam_xfrsample(struct sam_dev_s *priv, int index)
{
/* On a multiple block transfer, only sample on the first block */
if ((priv->smplset & (1 << index)) == 0)
{
struct sam_xfrregs_s *regs = &priv->xfrsamples[index];
#ifdef CONFIG_DEBUG_DMA
sam_dmasample(priv->dma, &regs->dma);
#endif
sam_hsmcisample(priv, &regs->hsmci);
priv->smplset |= (1 << index);
}
}
#endif
/****************************************************************************
* Name: sam_xfrsampleinit
*
* Description:
* Setup prior to collecting transfer samples
*
****************************************************************************/
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
static void sam_xfrsampleinit(struct sam_dev_s *priv)
{
priv->smplset = 0;
memset(priv->xfrsamples, 0xff,
DEBUG_NDMASAMPLES * sizeof(struct sam_xfrregs_s));
#ifdef CONFIG_SAMA5_HSMCI_CMDDEBUG
priv->xfrinitialized = true;
#endif
}
#endif
/****************************************************************************
* Name: sam_xfrdumpone
*
* Description:
* Dump one transfer register sample
*
****************************************************************************/
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
static void sam_xfrdumpone(struct sam_dev_s *priv, int index,
const char *msg)
{
if ((priv->smplset & (1 << index)) != 0)
{
struct sam_xfrregs_s *regs = &priv->xfrsamples[index];
#ifdef CONFIG_DEBUG_DMA
sam_dmadump(priv->dma, &regs->dma, msg);
#endif
sam_hsmcidump(priv, &regs->hsmci, msg);
}
else
{
fdbg("%s: Not collected\n", msg);
}
}
#endif
/****************************************************************************
* Name: sam_xfrdump
*
* Description:
* Dump all transfer-related, sampled register data
*
****************************************************************************/
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
static void sam_xfrdump(struct sam_dev_s *priv)
{
#ifdef CONFIG_SAMA5_HSMCI_CMDDEBUG
if (priv->xfrinitialized)
#endif
{
sam_xfrdumpone(priv, SAMPLENDX_BEFORE_SETUP, "Before setup");
#ifdef CONFIG_DEBUG_DMA
sam_xfrdumpone(priv, SAMPLENDX_BEFORE_ENABLE, "Before DMA enable");
#endif
sam_xfrdumpone(priv, SAMPLENDX_AFTER_SETUP, "After setup");
sam_xfrdumpone(priv, SAMPLENDX_END_TRANSFER, "End of transfer");
#ifdef CONFIG_DEBUG_DMA
sam_xfrdumpone(priv, SAMPLENDX_DMA_CALLBACK, "DMA Callback");
#endif
sam_xfrdumpone(priv, SAMPLENDX_TIMEOUT, "Timeout");
priv->smplset = 0;
#ifdef CONFIG_SAMA5_HSMCI_CMDDEBUG
priv->xfrinitialized = false;
#endif
}
}
#endif
/****************************************************************************
* Name: sam_cmdsampleinit
*
* Description:
* Setup prior to collecting command/response samples
*
****************************************************************************/
#ifdef CONFIG_SAMA5_HSMCI_CMDDEBUG
static void sam_cmdsampleinit(struct sam_dev_s *priv)
{
memset(priv->cmdsamples, 0xff,
DEBUG_NCMDSAMPLES * sizeof(struct sam_hsmciregs_s));
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
priv->cmdinitialized = true;
#endif
}
#endif
/****************************************************************************
* Name: sam_cmdsample1 & 2
*
* Description:
* Sample command/response registers
*
****************************************************************************/
#ifdef CONFIG_SAMA5_HSMCI_CMDDEBUG
static inline void sam_cmdsample1(struct sam_dev_s *priv, int index)
{
sam_hsmcisample(priv, &priv->cmdsamples[index]);
}
static inline void sam_cmdsample2(struct sam_dev_s *priv, int index,
uint32_t sr)
{
sam_hsmcisample(priv, &priv->cmdsamples[index]);
priv->cmdsamples[index].sr = sr;
}
#endif
/****************************************************************************
* Name: sam_cmddump
*
* Description:
* Dump all comand/response register data
*
****************************************************************************/
#ifdef CONFIG_SAMA5_HSMCI_CMDDEBUG
static void sam_cmddump(struct sam_dev_s *priv)
{
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
if (priv->cmdinitialized)
#endif
{
sam_hsmcidump(priv, &priv->cmdsamples[SAMPLENDX_AFTER_CMDR],
"After command setup");
sam_hsmcidump(priv, &priv->cmdsamples[SAMPLENDX_AT_WAKEUP],
"After wakeup");
#ifdef CONFIG_SAMA5_HSMCI_XFRDEBUG
priv->cmdinitialized = false;
#endif
}
}
#endif
/****************************************************************************
* DMA Helpers
****************************************************************************/
/****************************************************************************
* Name: sam_dmacallback
*
* Description:
* Called when HSMCI DMA completes
*
****************************************************************************/
static void sam_dmacallback(DMA_HANDLE handle, void *arg, int result)
{
struct sam_dev_s *priv = (struct sam_dev_s *)arg;
sdio_eventset_t wkupevent;
/* Is DMA still active? We can get this callback when sam_dmastop() is
* called too.
*/
if (priv->dmabusy)
{
/* Mark the DMA not busy and sample DMA registers */
priv->dmabusy = false;
sam_xfrsample((struct sam_dev_s *)arg, SAMPLENDX_DMA_CALLBACK);
/* Disable the DMA handshaking */
sam_putreg(priv, 0, SAM_HSMCI_DMA_OFFSET);
/* Terminate the transfer with an I/O error in the event of a DMA failure */
if (result < 0)
{
wkupevent = (result == -ETIMEDOUT ? SDIOWAIT_TIMEOUT : SDIOWAIT_ERROR);
flldbg("ERROR: DMA failed: result=%d wkupevent=%04x\n", result, wkupevent);
/* sam_endtransfer will terminate the transfer and wait up the waiting
* client in this case.
*/
sam_endtransfer(priv, wkupevent);
}
/* The DMA completed without error. Wake-up the waiting client if (1) both the
* HSMCI and DMA completion events, and (2) There is a client waiting for
* this event.
*
* If the HSMCI transfer event has already completed, it must have completed
* successfully (because the DMA was not cancelled). sam_endtransfer() should
* have already received the SDIOWAIT_TRANSFERDONE event, but this event would
* not yet have been recorded. We need to post the SDIOWAIT_TRANSFERDONE
* again in this case here.
*
* The timeout will remain active until sam_endwait() is eventually called
* so we should not have any concern about hangs if the HSMCI transfer never
* completed.
*/
else if (!priv->xfrbusy && (priv->waitevents & SDIOWAIT_TRANSFERDONE) != 0)
{
/* Okay.. wake up any waiting threads */
sam_endwait(priv, SDIOWAIT_TRANSFERDONE);
}
}
}
/****************************************************************************
* Name: hsmci_physregaddr
*
* Description:
* Return the physical address of an HSMCI register
*
****************************************************************************/
static inline uintptr_t hsmci_physregaddr(struct sam_dev_s *priv,
unsigned int offset)
{
return sam_physregaddr(priv->base + offset);
}
/****************************************************************************
* Data Transfer Helpers
****************************************************************************/
/****************************************************************************
* Name: sam_eventtimeout
*
* Description:
* The watchdog timeout setup when the event wait start has expired without
* any other waited-for event occurring.
*
* Input Parameters:
* argc - The number of arguments (should be 1)
* arg - The argument (state structure reference cast to uint32_t)
*
* Returned Value:
* None
*
* Assumptions:
* Always called from the interrupt level with interrupts disabled.
*
****************************************************************************/
static void sam_eventtimeout(int argc, uint32_t arg)
{
struct sam_dev_s *priv = (struct sam_dev_s *)arg;
DEBUGASSERT(argc == 1 && priv != NULL);
sam_xfrsample((struct sam_dev_s *)arg, SAMPLENDX_TIMEOUT);
/* Make sure that any hung DMA is stopped. dmabusy == false is the cue
* so the DMA callback is ignored.
*/
priv->dmabusy = false;
sam_dmastop(priv->dma);
/* Disable the DMA handshaking */
sam_putreg(priv, 0, SAM_HSMCI_DMA_OFFSET);
/* Make sure that any hung HSMCI transfer is stopped */
sam_disablexfrints(priv);
sam_notransfer(priv);
/* Is a data timeout complete event expected? (should always be the case) */
if ((priv->waitevents & SDIOWAIT_TIMEOUT) != 0)
{
/* Yes.. wake up any waiting threads */
sam_endwait(priv, SDIOWAIT_TIMEOUT);
flldbg("ERROR: Timeout\n");
}
}
/****************************************************************************
* Name: sam_endwait
*
* Description:
* Wake up a waiting thread if the waited-for event has occurred.
*
* Input Parameters:
* priv - An instance of the HSMCI device interface
* wkupevent - The event that caused the wait to end
*
* Returned Value:
* None
*
* Assumptions:
* Always called from the interrupt level with interrupts disabled.
*
****************************************************************************/
static void sam_endwait(struct sam_dev_s *priv, sdio_eventset_t wkupevent)
{
/* Cancel the watchdog timeout */
(void)wd_cancel(priv->waitwdog);
/* Disable event-related interrupts and save wakeup event */
sam_disablewaitints(priv, wkupevent);
/* Wake up the waiting thread */
sam_givesem(priv);
}
/****************************************************************************
* Name: sam_endtransfer
*
* Description:
* Terminate a transfer with the provided status. This function is called
* only from the HSMCI interrupt handler when end-of-transfer conditions
* are detected.
*
* Input Parameters:
* priv - An instance of the HSMCI device interface
* wkupevent - The event that caused the transfer to end
*
* Returned Value:
* None
*
* Assumptions:
* Always called from the interrupt level with interrupts disabled.
*
****************************************************************************/
static void sam_endtransfer(struct sam_dev_s *priv,
sdio_eventset_t wkupevent)
{
/* Disable all transfer related interrupts */
sam_disablexfrints(priv);
/* No data transfer */
sam_notransfer(priv);
/* DMA debug instrumentation */
sam_xfrsample(priv, SAMPLENDX_END_TRANSFER);
/* Make sure that the DMA is stopped (it will be stopped automatically
* on normal transfers, but not necessarily when the transfer terminates
* on an error condition).
*/
if ((wkupevent & (SDIOWAIT_TIMEOUT | SDIOWAIT_ERROR)) != 0)
{
/* dmabusy == false gives the DMA callback handler a clue about what
* is going on.
*/
priv->dmabusy = false;
sam_dmastop(priv->dma);
/* Disable the DMA handshaking */
sam_putreg(priv, 0, SAM_HSMCI_DMA_OFFSET);
}
/* The transfer is complete. Wake-up the waiting client if (1) both the
* HSMCI and DMA completion events, and (2) There is a client waiting for
* this event.
*
* The timeout will remain active until sam_endwait() is eventually called
* so we should not have any concern about hangs if the DMA never completes.
*/
if (!priv->dmabusy && (priv->waitevents & wkupevent) != 0)
{
/* Okay.. wake up any waiting threads */
sam_endwait(priv, wkupevent);
}
}
/****************************************************************************
* Name: sam_notransfer
*
* Description:
* Setup for no transfer. This is called both before beginning a new
* transfer and when a transfer completes. In the first case, this is the
* default setup that is overridden by sam_dmarecvsetup or sam_dmasendsetup
*
* Input Parameters:
* priv - An instance of the HSMCI device interface
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_notransfer(struct sam_dev_s *priv)
{
uint32_t regval;
/* Make read/write proof (or not). This is a legacy behavior: This really
* just needs be be done once at initialization time.
*/
regval = sam_getreg(priv, SAM_HSMCI_MR_OFFSET);
regval &= ~(HSMCI_MR_RDPROOF | HSMCI_MR_WRPROOF);
sam_putreg(priv, regval, SAM_HSMCI_MR_OFFSET);
/* Clear the block size and count */
sam_putreg(priv, 0, SAM_HSMCI_BLKR_OFFSET);
/* Clear transfer flags (DMA could still be active in a corner case) */
priv->xfrbusy = false;
priv->txbusy = false;
}
/****************************************************************************
* Interrupt Handling
****************************************************************************/
/****************************************************************************
* Name: sam_hsmci_interrupt
*
* Description:
* HSMCI interrupt handler
*
* Input Parameters:
* irq - IRQ number of the interrupts
* context - Saved machine context at the time of the interrupt
*
* Returned Value:
* None
*
****************************************************************************/
static int sam_hsmci_interrupt(struct sam_dev_s *priv)
{
uint32_t sr;
uint32_t enabled;
uint32_t pending;
/* Loop while there are pending interrupts. */
for (;;)
{
/* Check the HSMCI status register. Mask out all bits that don't
* correspond to enabled interrupts. (This depends on the fact that
* bits are ordered the same in both the SR and IMR registers). If
* there are non-zero bits remaining, then we have work to do here.
*/
sr = sam_getreg(priv, SAM_HSMCI_SR_OFFSET);
enabled = sr & sam_getreg(priv, SAM_HSMCI_IMR_OFFSET);
if (enabled == 0)
{
break;
}
/* Handle in progress, interrupt driven data transfers ****************/
/* Do any of these interrupts signal a data transfer event? */
pending = enabled & priv->xfrmask;
if (pending != 0)
{
/* Yes.. Did the transfer complete with an error? */
if ((pending & HSMCI_DATA_ERRORS) != 0)
{
/* Yes.. Was it some kind of timeout error? */
flldbg("ERROR: enabled: %08x pending: %08x\n", enabled, pending);
if ((pending & HSMCI_DATA_TIMEOUT_ERRORS) != 0)
{
/* Yes.. Terminate with a timeout. */
sam_endtransfer(priv, SDIOWAIT_TRANSFERDONE|SDIOWAIT_TIMEOUT);
}
else
{
/* No.. Terminate with an I/O error. */
sam_endtransfer(priv, SDIOWAIT_TRANSFERDONE|SDIOWAIT_ERROR);
}
}
/* No, If RXRDY is enabled, then we are doing a non-DMA receive.
* We need to transfer word(s) from the RDR register to the user
* buffer.
*/
else if ((pending & HSMCI_INT_RXRDY) != 0)
{
/* Interrupt mode data transfer support */
DEBUGASSERT(!priv->dmabusy && priv->xfrbusy && !priv->txbusy);
DEBUGASSERT(priv->buffer && priv->remaining > 0);
*priv->buffer++ = sam_getreg(priv, SAM_HSMCI_RDR_OFFSET);
priv->remaining -= sizeof(uint32_t);
/* Are we finished? */
if (priv->remaining <= 0)
{
/* Yes.. End the transfer */
priv->buffer = NULL;
priv->remaining = 0;
sam_endtransfer(priv, SDIOWAIT_TRANSFERDONE);
}
}
/* Otherwise it must be a DMA transfer that completed successfully */
else
{
/* End the transfer */
sam_endtransfer(priv, SDIOWAIT_TRANSFERDONE);
}
}
/* Handle wait events *************************************************/
/* Do any of these interrupts signal wakeup event? */
pending = enabled & priv->waitmask;
if (pending != 0)
{
sdio_eventset_t wkupevent = 0;
/* Is this a Command-Response sequence completion event? */
if ((pending & priv->cmdrmask) != 0)
{
sam_cmdsample2(priv, SAMPLENDX_AT_WAKEUP, sr);
/* Yes.. Did the Command-Response sequence end with an error? */
if ((pending & HSMCI_RESPONSE_ERRORS) != 0)
{
/* Yes.. Was the error some kind of timeout? */
fllvdbg("ERROR: events: %08x SR: %08x\n",
priv->cmdrmask, enabled);
if ((pending & HSMCI_RESPONSE_TIMEOUT_ERRORS) != 0)
{
/* Yes.. signal a timeout error */
wkupevent = SDIOWAIT_CMDDONE|SDIOWAIT_RESPONSEDONE|SDIOWAIT_TIMEOUT;
}
else
{
/* No.. signal some generic I/O error */
wkupevent = SDIOWAIT_CMDDONE|SDIOWAIT_RESPONSEDONE|SDIOWAIT_ERROR;
}
}
else
{
/* The Command-Response sequence ended with no error */
wkupevent = SDIOWAIT_CMDDONE|SDIOWAIT_RESPONSEDONE;
}
/* Yes.. Is there a thread waiting for this event set? */
wkupevent &= priv->waitevents;
if (wkupevent != 0)
{
/* Yes.. wake the thread up */
sam_endwait(priv, wkupevent);
}
}
}
}
return OK;
}
/****************************************************************************
* Name: sam_hsmci0_interrupt, sam_hsmci1_interrupt, and sam_hsmci2_interrupt
*
* Description:
* HSMCI interrupt handler
*
* Input Parameters:
* irq - IRQ number of the interrupts
* context - Saved machine context at the time of the interrupt
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_SAMA5_HSMCI0
static int sam_hsmci0_interrupt(int irq, void *context)
{
return sam_hsmci_interrupt(&g_hsmci0);
}
#endif
#ifdef CONFIG_SAMA5_HSMCI1
static int sam_hsmci1_interrupt(int irq, void *context)
{
return sam_hsmci_interrupt(&g_hsmci1);
}
#endif
#ifdef CONFIG_SAMA5_HSMCI2
static int sam_hsmci2_interrupt(int irq, void *context)
{
return sam_hsmci_interrupt(&g_hsmci2);
}
#endif
/****************************************************************************
* SDIO Interface Methods
****************************************************************************/
/****************************************************************************
* Name: sam_reset
*
* Description:
* Reset the HSMCI controller. Undo all setup and initialization.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_reset(FAR struct sdio_dev_s *dev)
{
FAR struct sam_dev_s *priv = (FAR struct sam_dev_s *)dev;
irqstate_t flags;
/* Reset the MCI */
flags = irqsave();
sam_putreg(priv, HSMCI_CR_SWRST, SAM_HSMCI_CR_OFFSET);
/* Disable the MCI */
sam_putreg(priv, HSMCI_CR_MCIDIS | HSMCI_CR_PWSDIS, SAM_HSMCI_CR_OFFSET);
/* Disable all the interrupts */
sam_putreg(priv, 0xffffffff, SAM_HSMCI_IDR_OFFSET);
/* Set the Data Timeout Register */
sam_putreg(priv, HSMCI_DTOR_DTOCYC_MAX | HSMCI_DTOR_DTOMUL_MAX,
SAM_HSMCI_DTOR_OFFSET);
/* Set the Mode Register for ID mode frequency (probably 400KHz) */
sam_clock(dev, CLOCK_IDMODE);
/* Set the SDCard Register */
sam_putreg(priv, HSMCI_SDCR_SDCSEL_SLOTA | HSMCI_SDCR_SDCBUS_4BIT,
SAM_HSMCI_SDCR_OFFSET);
/* Enable the MCI controller */
sam_putreg(priv, HSMCI_CR_MCIEN, SAM_HSMCI_CR_OFFSET);
/* Disable the DMA interface */
sam_putreg(priv, 0, SAM_HSMCI_DMA_OFFSET);
/* Configure MCI */
sam_putreg(priv, HSMCI_CFG_FIFOMODE, SAM_HSMCI_CFG_OFFSET);
/* No data transfer */
sam_notransfer(priv);
/* Reset data */
priv->waitevents = 0; /* Set of events to be waited for */
priv->waitmask = 0; /* Interrupt enables for event waiting */
priv->wkupevent = 0; /* The event that caused the wakeup */
priv->dmabusy = false; /* No DMA in progress */
wd_cancel(priv->waitwdog); /* Cancel any timeouts */
/* Interrupt mode data transfer support */
priv->xfrmask = 0; /* Interrupt enables for data transfer */
/* DMA data transfer support */
priv->widebus = false; /* Required for DMA support */
irqrestore(flags);
}
/****************************************************************************
* Name: sam_status
*
* Description:
* Get SDIO status.
*
* Input Parameters:
* dev - Device-specific state data
*
* Returned Value:
* Returns a bitset of status values (see sam_status_* defines)
*
****************************************************************************/
static uint8_t sam_status(FAR struct sdio_dev_s *dev)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
return priv->cdstatus;
}
/****************************************************************************
* Name: sam_widebus
*
* Description:
* Called after change in Bus width has been selected (via ACMD6). Most
* controllers will need to perform some special operations to work
* correctly in the new bus mode.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* wide - true: wide bus (4-bit) bus mode enabled
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_widebus(FAR struct sdio_dev_s *dev, bool wide)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
uint32_t regval;
/* Set 1-bit or 4-bit bus by configuring the SDCBUS field of the SDCR register */
regval = sam_getreg(priv, SAM_HSMCI_SDCR_OFFSET);
regval &= ~HSMCI_SDCR_SDCBUS_MASK;
regval |= wide ? HSMCI_SDCR_SDCBUS_4BIT : HSMCI_SDCR_SDCBUS_1BIT;
sam_putreg(priv, regval, SAM_HSMCI_SDCR_OFFSET);
/* Remember the setting */
priv->widebus = wide;
}
/****************************************************************************
* Name: sam_clock
*
* Description:
* Enable/disable SDIO clocking
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* rate - Specifies the clocking to use (see enum sdio_clock_e)
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_clock(FAR struct sdio_dev_s *dev, enum sdio_clock_e rate)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
uint32_t regval;
bool enable = true;
/* Fetch the current mode register and mask out the clkdiv+clockodd (and pwsdiv) */
regval = sam_getreg(priv, SAM_HSMCI_MR_OFFSET);
regval &= ~(HSMCI_MR_CLKDIV_MASK | HSMCI_MR_PWSDIV_MASK | HSMCI_MR_CLKODD);
/* These clock devisor values that must be defined in the board-specific
* board.h header file: HSMCI_INIT_CLKDIV, HSMCI_MMCXFR_CLKDIV,
* HSMCI_SDXFR_CLKDIV, and HSMCI_SDWIDEXFR_CLKDIV.
*/
switch (rate)
{
default:
case CLOCK_SDIO_DISABLED: /* Clock is disabled */
regval |= HSMCI_INIT_CLKDIV | HSMCI_MR_PWSDIV_MAX;
enable = false;
return;
case CLOCK_IDMODE: /* Initial ID mode clocking (<400KHz) */
regval |= HSMCI_INIT_CLKDIV | HSMCI_MR_PWSDIV_MAX;
break;
case CLOCK_MMC_TRANSFER: /* MMC normal operation clocking */
regval |= HSMCI_MMCXFR_CLKDIV | HSMCI_MR_PWSDIV_MAX;
break;
case CLOCK_SD_TRANSFER_1BIT: /* SD normal operation clocking (narrow 1-bit mode) */
regval |= HSMCI_SDXFR_CLKDIV | HSMCI_MR_PWSDIV_MAX;
break;
case CLOCK_SD_TRANSFER_4BIT: /* SD normal operation clocking (wide 4-bit mode) */
regval |= HSMCI_SDWIDEXFR_CLKDIV | HSMCI_MR_PWSDIV_MAX;
break;
};
/* Set the new clock diver and make sure that the clock is enabled or
* disabled, whichever the case.
*/
sam_putreg(priv, regval, SAM_HSMCI_MR_OFFSET);
if (enable)
{
sam_enable(priv);
}
else
{
sam_disable(priv);
}
}
/****************************************************************************
* Name: sam_attach
*
* Description:
* Attach and prepare interrupts
*
* Input Parameters:
* dev - An instance of the SDIO device interface
*
* Returned Value:
* OK on success; A negated errno on failure.
*
****************************************************************************/
static int sam_attach(FAR struct sdio_dev_s *dev)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
xcpt_t handler;
int irq;
int ret;
/* Select the handler and IRQ */
#ifdef CONFIG_SAMA5_HSMCI0
if (priv->hsmci == 0)
{
handler = sam_hsmci0_interrupt;
irq = SAM_IRQ_HSMCI0;
}
else
#endif
#ifdef CONFIG_SAMA5_HSMCI1
if (priv->hsmci == 1)
{
handler = sam_hsmci1_interrupt;
irq = SAM_IRQ_HSMCI1;
}
else
#endif
#ifdef CONFIG_SAMA5_HSMCI2
if (priv->hsmci == 2)
{
handler = sam_hsmci2_interrupt;
irq = SAM_IRQ_HSMCI2;
}
else
#endif
{
DEBUGPANIC();
return -EINVAL; /* Shouldn't happen */
}
/* Attach the HSMCI interrupt handler */
ret = irq_attach(irq, handler);
if (ret == OK)
{
/* Disable all interrupts at the HSMCI controller and clear (most) static
* interrupt flags by reading the status register.
*/
sam_putreg(priv, 0xffffffff, SAM_HSMCI_IDR_OFFSET);
(void)sam_getreg(priv, SAM_HSMCI_SR_OFFSET);
/* Enable HSMCI interrupts at the NVIC. They can now be enabled at
* the HSMCI controller as needed.
*/
up_enable_irq(irq);
}
return ret;
}
/****************************************************************************
* Name: sam_sendcmd
*
* Description:
* Send the SDIO command
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* cmd - The command to send (32-bits, encoded)
* arg - 32-bit argument required with some commands
*
* Returned Value:
* None
*
****************************************************************************/
static int sam_sendcmd(FAR struct sdio_dev_s *dev,
uint32_t cmd, uint32_t arg)
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
uint32_t regval;
uint32_t cmdidx;
sam_cmdsampleinit(priv);
/* Set the HSMCI Argument value */
sam_putreg(priv, arg, SAM_HSMCI_ARGR_OFFSET);
/* Construct the command valid, starting with the command index */
cmdidx = (cmd & MMCSD_CMDIDX_MASK) >> MMCSD_CMDIDX_SHIFT;
regval = cmdidx << HSMCI_CMDR_CMDNB_SHIFT;
/* 'OR' in response related bits */
switch (cmd & MMCSD_RESPONSE_MASK)
{
/* No response */
case MMCSD_NO_RESPONSE:
priv->cmdrmask = HSMCI_CMDRESP_INTS;
regval |= HSMCI_CMDR_RSPTYP_NONE;
break;
/* 48-bit response with CRC */
case MMCSD_R1_RESPONSE:
case MMCSD_R4_RESPONSE:
case MMCSD_R5_RESPONSE:
case MMCSD_R6_RESPONSE:
priv->cmdrmask = HSMCI_CMDRESP_INTS;
regval |= (HSMCI_CMDR_RSPTYP_48BIT | HSMCI_CMDR_MAXLAT);
break;
case MMCSD_R1B_RESPONSE:
priv->cmdrmask = HSMCI_CMDRESP_INTS;
regval |= (HSMCI_CMDR_RSPTYP_R1B | HSMCI_CMDR_MAXLAT);
break;
/* 48-bit response without CRC */
case MMCSD_R3_RESPONSE:
case MMCSD_R7_RESPONSE:
priv->cmdrmask = HSMCI_CMDRESP_NOCRC_INTS;
regval |= (HSMCI_CMDR_RSPTYP_48BIT | HSMCI_CMDR_MAXLAT);
break;
/* 136-bit response with CRC */
case MMCSD_R2_RESPONSE:
priv->cmdrmask = HSMCI_CMDRESP_INTS;
regval |= (HSMCI_CMDR_RSPTYP_136BIT | HSMCI_CMDR_MAXLAT);
break;
}
/* 'OR' in data transfer related bits */
switch (cmd & MMCSD_DATAXFR_MASK)
{
#if 0 /* No MMC support */
case MMCSD_RDSTREAM: /* MMC Read stream */
regval |= (HSMCI_CMDR_TRCMD_START | HSMCI_CMDR_TRTYP_STREAM | HSMCI_CMDR_TRDIR_READ);
break;
case MMCSD_WRSTREAM: /* MMC Write stream */
regval |= (HSMCI_CMDR_TRCMD_START | HSMCI_CMDR_TRTYP_STREAM | HSMCI_CMDR_TRDIR_WRITE);
break;
#endif
case MMCSD_RDDATAXFR: /* Read block transfer */
regval |= (HSMCI_CMDR_TRCMD_START | HSMCI_CMDR_TRDIR_READ);
regval |= (cmd & MMCSD_MULTIBLOCK) ? HSMCI_CMDR_TRTYP_MULTIPLE : HSMCI_CMDR_TRTYP_SINGLE;
break;
case MMCSD_WRDATAXFR: /* Write block transfer */
regval |= (HSMCI_CMDR_TRCMD_START | HSMCI_CMDR_TRDIR_WRITE);
regval |= (cmd & MMCSD_MULTIBLOCK) ? HSMCI_CMDR_TRTYP_MULTIPLE : HSMCI_CMDR_TRTYP_SINGLE;
break;
case MMCSD_NODATAXFR:
default:
if ((cmd & MMCSD_STOPXFR) != 0)
{
regval |= HSMCI_CMDR_TRCMD_STOP;
}
break;
}
/* 'OR' in Open Drain option */
#if 0 /* No MMC support */
if ((cmd & MMCSD_OPENDRAIN) != 0)
{
regval |= HSMCI_CMDR_OPDCMD;
}
#endif
/* Write the fully decorated command to CMDR */
fvdbg("cmd: %08x arg: %08x regval: %08x\n", cmd, arg, regval);
sam_putreg(priv, regval, SAM_HSMCI_CMDR_OFFSET);
sam_cmdsample1(priv, SAMPLENDX_AFTER_CMDR);
return OK;
}
/****************************************************************************
* Name: sam_blocksetup
*
* Description:
* Some hardward needs to be informed of the selected blocksize.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* blocklen - The selected block size.
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_blocksetup(FAR struct sdio_dev_s *dev, unsigned int blocklen,
unsigned int nblocks)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
uint32_t regval;
DEBUGASSERT(dev != NULL && nblocks > 0 && nblocks < 65535);
DEBUGASSERT(blocklen < 65535 && (blocklen & 3) == 0);
/* Make read/write proof (or not). This is a legacy behavior: This really
* just needs be be done once at initialization time.
*/
regval = sam_getreg(priv, SAM_HSMCI_MR_OFFSET);
regval &= ~(HSMCI_MR_RDPROOF | HSMCI_MR_WRPROOF);
regval |= HSMCU_PROOF_BITS;
sam_putreg(priv, regval, SAM_HSMCI_MR_OFFSET);
/* Set the block size and count */
regval = (blocklen << HSMCI_BLKR_BLKLEN_SHIFT) |
(nblocks << HSMCI_BLKR_BCNT_SHIFT);
sam_putreg(priv, regval, SAM_HSMCI_BLKR_OFFSET);
}
/****************************************************************************
* Name: sam_recvsetup
*
* Description:
* Setup hardware in preparation for data transfer from the card in non-DMA
* (interrupt driven mode). This method will do whatever controller setup
* is necessary. This would be called for SD memory just BEFORE sending
* CMD13 (SEND_STATUS), CMD17 (READ_SINGLE_BLOCK), CMD18
* (READ_MULTIPLE_BLOCKS), ACMD51 (SEND_SCR), etc. Normally, SDIO_WAITEVENT
* will be called to receive the indication that the transfer is complete.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* buffer - Address of the buffer in which to receive the data
* buflen - The number of bytes in the transfer
*
* Returned Value:
* Number of bytes sent on success; a negated errno on failure
*
****************************************************************************/
static int sam_recvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer,
size_t buflen)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
DEBUGASSERT(priv != NULL && buffer != NULL && buflen > 0);
DEBUGASSERT(((uint32_t)buffer & 3) == 0);
/* Initialize register sampling */
sam_xfrsampleinit(priv);
sam_xfrsample(priv, SAMPLENDX_BEFORE_SETUP);
/* Disable DMA handshaking */
sam_putreg(priv, 0, SAM_HSMCI_DMA_OFFSET);
/* Setup of the transfer configuration */
priv->dmabusy = false;
priv->xfrbusy = true;
priv->txbusy = false;
/* Save the destination buffer information for use by the interrupt handler */
priv->buffer = (uint32_t*)buffer;
priv->remaining = buflen;
/* And enable interrupts */
sam_configxfrints(priv, HSMCI_RECV_INTS);
sam_xfrsample(priv, SAMPLENDX_AFTER_SETUP);
return OK;
}
/****************************************************************************
* Name: sam_sendsetup
*
* Description:
* Setup hardware in preparation for data transfer from the card. This method
* will do whatever controller setup is necessary. This would be called
* for SD memory just AFTER sending CMD24 (WRITE_BLOCK), CMD25
* (WRITE_MULTIPLE_BLOCK), ... and before SDIO_SENDDATA is called.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* buffer - Address of the buffer containing the data to send
* buflen - The number of bytes in the transfer
*
* Returned Value:
* Number of bytes sent on success; a negated errno on failure
*
****************************************************************************/
static int sam_sendsetup(FAR struct sdio_dev_s *dev, FAR const uint8_t *buffer,
size_t buflen)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
unsigned int nwords;
const uint32_t *ptr;
uint32_t sr;
DEBUGASSERT(priv != NULL && buffer != NULL && buflen > 0);
DEBUGASSERT(((uint32_t)buffer & 3) == 0);
/* Disable DMA handshaking */
sam_putreg(priv, 0, SAM_HSMCI_DMA_OFFSET);
sam_configxfrints(priv, HSMCI_DMASEND_INTS);
priv->dmabusy = false;
priv->xfrbusy = true;
priv->txbusy = true;
/* Nullify register sampling */
sam_xfrsampleinit(priv);
/* Copy each word to the TX FIFO
*
* REVISIT: If TX data underruns occur, then it may be necessary to
* disable pre-emption around this loop.
*/
nwords = (buflen + 3) >> 2;
ptr = (const uint32_t *)buffer;
while (nwords > 0)
{
/* Check the HSMCI status */
sr = sam_getreg(priv, SAM_HSMCI_SR_OFFSET);
if ((sr & HSMCI_DATA_DMASEND_ERRORS) != 0)
{
/* Some fatal error has occurred */
fdbg("ERROR: sr %08x\n", sr);
return -EIO;
}
else if ((sr & HSMCI_INT_TXRDY) != 0)
{
/* TXRDY -- transfer another word */
sam_putreg(priv, *ptr++, SAM_HSMCI_TDR_OFFSET);
nwords--;
}
}
return OK;
}
/****************************************************************************
* Name: sam_cancel
*
* Description:
* Cancel the data transfer setup of SDIO_RECVSETUP, SDIO_SENDSETUP,
* SDIO_DMARECVSETUP or SDIO_DMASENDSETUP. This must be called to cancel
* the data transfer setup if, for some reason, you cannot perform the
* transfer.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
*
* Returned Value:
* OK is success; a negated errno on failure
*
****************************************************************************/
static int sam_cancel(FAR struct sdio_dev_s *dev)
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
/* Disable all transfer- and event- related interrupts */
sam_disablexfrints(priv);
sam_disablewaitints(priv, 0);
/* No data transfer */
sam_notransfer(priv);
/* Clearing (most) pending interrupt status by reading the status register */
(void)sam_getreg(priv, SAM_HSMCI_SR_OFFSET);
/* Cancel any watchdog timeout */
(void)wd_cancel(priv->waitwdog);
/* Make sure that the DMA is stopped (it will be stopped automatically
* on normal transfers, but not necessarily when the transfer terminates
* on an error condition.
*
* dmabusy == false let's the DMA callback know what is happening.
*/
priv->dmabusy = false;
sam_dmastop(priv->dma);
/* Disable the DMA handshaking */
sam_putreg(priv, 0, SAM_HSMCI_DMA_OFFSET);
return OK;
}
/****************************************************************************
* Name: sam_waitresponse
*
* Description:
* Poll-wait for the response to the last command to be ready.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* cmd - The command that was sent. See 32-bit command definitions above.
*
* Returned Value:
* OK is success; a negated errno on failure
*
****************************************************************************/
static int sam_waitresponse(FAR struct sdio_dev_s *dev, uint32_t cmd)
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
uint32_t sr;
uint32_t pending;
int32_t timeout;
switch (cmd & MMCSD_RESPONSE_MASK)
{
case MMCSD_R1_RESPONSE:
case MMCSD_R1B_RESPONSE:
case MMCSD_R2_RESPONSE:
case MMCSD_R6_RESPONSE:
timeout = HSMCI_LONGTIMEOUT;
break;
case MMCSD_R4_RESPONSE:
case MMCSD_R5_RESPONSE:
return -ENOSYS;
case MMCSD_NO_RESPONSE:
case MMCSD_R3_RESPONSE:
case MMCSD_R7_RESPONSE:
timeout = HSMCI_CMDTIMEOUT;
break;
default:
return -EINVAL;
}
/* Then wait for the response (or timeout) */
for (;;)
{
/* Did a Command-Response sequence termination evernt occur? */
sr = sam_getreg(priv, SAM_HSMCI_SR_OFFSET);
pending = sr & priv->cmdrmask;
if (pending != 0)
{
sam_cmdsample2(priv, SAMPLENDX_AT_WAKEUP, sr);
sam_cmddump(priv);
/* Yes.. Did the Command-Response sequence end with an error? */
if ((pending & HSMCI_RESPONSE_ERRORS) != 0)
{
/* Yes.. Was the error some kind of timeout? */
fdbg("ERROR: cmd: %08x events: %08x SR: %08x\n",
cmd, priv->cmdrmask, sr);
if ((pending & HSMCI_RESPONSE_TIMEOUT_ERRORS) != 0)
{
/* Yes.. return a timeout error */
priv->wkupevent = SDIOWAIT_CMDDONE|SDIOWAIT_RESPONSEDONE|SDIOWAIT_TIMEOUT;
return -ETIMEDOUT;
}
else
{
/* No.. return some generic I/O error */
priv->wkupevent = SDIOWAIT_CMDDONE|SDIOWAIT_RESPONSEDONE|SDIOWAIT_ERROR;
return -EIO;
}
}
else
{
/* The Command-Response sequence ended with no error */
priv->wkupevent = SDIOWAIT_CMDDONE|SDIOWAIT_RESPONSEDONE;
return OK;
}
}
else if (--timeout <= 0)
{
fdbg("ERROR: Timeout cmd: %08x events: %08x SR: %08x\n",
cmd, priv->cmdrmask, sr);
priv->wkupevent = SDIOWAIT_TIMEOUT;
return -ETIMEDOUT;
}
}
}
/****************************************************************************
* Name: sam_recvRx
*
* Description:
* Receive response to SDIO command. Only the critical payload is
* returned -- that is 32 bits for 48 bit status and 128 bits for 136 bit
* status. The driver implementation should verify the correctness of
* the remaining, non-returned bits (CRCs, CMD index, etc.).
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* Rx - Buffer in which to receive the response
*
* Returned Value:
* Number of bytes sent on success; a negated errno on failure. Here a
* failure means only a failure to obtain the requested reponse (due to
* transport problem -- timeout, CRC, etc.). The implementation only
* assures that the response is returned intact and does not check errors
* within the response itself.
*
****************************************************************************/
static int sam_recvshort(FAR struct sdio_dev_s *dev,
uint32_t cmd, uint32_t *rshort)
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
int ret = OK;
/* These responses could have CRC errors:
*
* R1 Command response (48-bit)
* 47 0 Start bit
* 46 0 Transmission bit (0=from card)
* 45:40 bit5 - bit0 Command index (0-63)
* 39:8 bit31 - bit0 32-bit card status
* 7:1 bit6 - bit0 CRC7
* 0 1 End bit
*
* R1b Identical to R1 with the additional busy signaling via the data
* line.
*
* R6 Published RCA Response (48-bit, SD card only)
* 47 0 Start bit
* 46 0 Transmission bit (0=from card)
* 45:40 bit5 - bit0 Command index (0-63)
* 39:8 bit31 - bit0 32-bit Argument Field, consisting of:
* [31:16] New published RCA of card
* [15:0] Card status bits {23,22,19,12:0}
* 7:1 bit6 - bit0 CRC7
* 0 1 End bit
*
* But there is no parity on the R3 response and parity errors should
* be ignored.
*
* R3 OCR (48-bit)
* 47 0 Start bit
* 46 0 Transmission bit (0=from card)
* 45:40 bit5 - bit0 Reserved
* 39:8 bit31 - bit0 32-bit OCR register
* 7:1 bit6 - bit0 Reserved
* 0 1 End bit
*/
#ifdef CONFIG_DEBUG
if (!rshort)
{
fdbg("ERROR: rshort=NULL\n");
ret = -EINVAL;
}
/* Check that this is the correct response to this command */
else if ((cmd & MMCSD_RESPONSE_MASK) != MMCSD_R1_RESPONSE &&
(cmd & MMCSD_RESPONSE_MASK) != MMCSD_R1B_RESPONSE &&
(cmd & MMCSD_RESPONSE_MASK) != MMCSD_R6_RESPONSE &&
(cmd & MMCSD_RESPONSE_MASK) != MMCSD_R3_RESPONSE &&
(cmd & MMCSD_RESPONSE_MASK) != MMCSD_R7_RESPONSE)
{
fdbg("ERROR: Wrong response CMD=%08x\n", cmd);
ret = -EINVAL;
}
else
#endif
/* Check for timeout errors */
if ((priv->wkupevent & SDIOWAIT_TIMEOUT) != 0)
{
ret = -EINVAL;
}
/* Check for other errors */
else if ((priv->wkupevent & SDIOWAIT_ERROR) != 0)
{
ret = -EIO;
}
/* Return the R1/R6 response */
else if (rshort)
{
*rshort = sam_getreg(priv, SAM_HSMCI_RSPR0_OFFSET);
}
priv->wkupevent = 0;
return ret;
}
static int sam_recvlong(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t rlong[4])
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
int ret = OK;
/* R2 CID, CSD register (136-bit)
* 135 0 Start bit
* 134 0 Transmission bit (0=from card)
* 133:128 bit5 - bit0 Reserved
* 127:1 bit127 - bit1 127-bit CID or CSD register
* (including internal CRC)
* 0 1 End bit
*/
#ifdef CONFIG_DEBUG
/* Check that R1 is the correct response to this command */
if ((cmd & MMCSD_RESPONSE_MASK) != MMCSD_R2_RESPONSE)
{
fdbg("ERROR: Wrong response CMD=%08x\n", cmd);
ret = -EINVAL;
}
else
#endif
/* Check for timeout errors */
if ((priv->wkupevent & SDIOWAIT_TIMEOUT) != 0)
{
ret = -EINVAL;
}
/* Check for other errors */
else if ((priv->wkupevent & SDIOWAIT_ERROR) != 0)
{
ret = -EIO;
}
/* Return the long response */
else if (rlong)
{
rlong[0] = sam_getreg(priv, SAM_HSMCI_RSPR0_OFFSET);
rlong[1] = sam_getreg(priv, SAM_HSMCI_RSPR1_OFFSET);
rlong[2] = sam_getreg(priv, SAM_HSMCI_RSPR2_OFFSET);
rlong[3] = sam_getreg(priv, SAM_HSMCI_RSPR3_OFFSET);
}
priv->wkupevent = 0;
return ret;
}
/* MMC responses not supported */
static int sam_recvnotimpl(FAR struct sdio_dev_s *dev,
uint32_t cmd, uint32_t *rnotimpl)
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
priv->wkupevent = 0;
return -ENOSYS;
}
/****************************************************************************
* Name: sam_waitenable
*
* Description:
* Enable/disable of a set of SDIO wait events. This is part of the
* the SDIO_WAITEVENT sequence. The set of to-be-waited-for events is
* configured before calling either calling SDIO_DMARECVSETUP,
* SDIO_DMASENDSETUP, or or SDIO_WAITEVENT. This is the recommended
* ordering:
*
* SDIO_WAITENABLE: Discard any pending interrupts, enable event(s)
* of interest
* SDIO_DMARECVSETUP/
* SDIO_DMASENDSETUP: Setup the logic that will trigger the event the
* event(s) of interest
* SDIO_WAITEVENT: Wait for the event of interest (which might
* already have occurred)
*
* This sequency should eliminate race conditions between the command/trasnfer
* setup and the subsequent events.
*
* The enabled events persist until either (1) SDIO_WAITENABLE is called
* again specifying a different set of wait events, or (2) SDIO_EVENTWAIT
* returns.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* eventset - A bitset of events to enable or disable (see SDIOWAIT_*
* definitions). 0=disable; 1=enable.
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_waitenable(FAR struct sdio_dev_s *dev,
sdio_eventset_t eventset)
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
uint32_t waitmask;
DEBUGASSERT(priv != NULL);
/* Disable event-related interrupts */
sam_disablewaitints(priv, 0);
/* Select the interrupt mask that will give us the appropriate wakeup
* interrupts.
*/
waitmask = 0;
if ((eventset & (SDIOWAIT_CMDDONE|SDIOWAIT_RESPONSEDONE)) != 0)
{
waitmask |= priv->cmdrmask;
}
/* Clear (most) pending interrupts by reading the status register.
* No interrupts should be lost (assuming that interrupts were enabled
* before sam_waitenable() was called). Any interrupts that become
* pending after this point must be valid event indications.
*/
(void)sam_getreg(priv, SAM_HSMCI_SR_OFFSET);
/* Wait interrupts are configured here, but not enabled until
* sam_eventwait() is called. Why? Because the XFRDONE interrupt is
* always pending until start the data transfer.
*/
sam_configwaitints(priv, waitmask, eventset);
}
/****************************************************************************
* Name: sam_eventwait
*
* Description:
* Wait for one of the enabled events to occur (or a timeout). Note that
* all events enabled by SDIO_WAITEVENTS are disabled when sam_eventwait
* returns. SDIO_WAITEVENTS must be called again before sam_eventwait
* can be used again.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* timeout - Maximum time in milliseconds to wait. Zero means immediate
* timeout with no wait. The timeout value is ignored if
* SDIOWAIT_TIMEOUT is not included in the waited-for eventset.
*
* Returned Value:
* Event set containing the event(s) that ended the wait. Should always
* be non-zero. All events are disabled after the wait concludes.
*
****************************************************************************/
static sdio_eventset_t sam_eventwait(FAR struct sdio_dev_s *dev,
uint32_t timeout)
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
sdio_eventset_t wkupevent = 0;
int ret;
/* Since interrupts not been enabled to this point, any relevant events
* are pending and should not yet have occurred.
*/
DEBUGASSERT(priv->waitevents != 0 && priv->wkupevent == 0);
/* Now enable event-related interrupts. If the events are pending, they
* may happen immediately here before entering the loop.
*/
sam_enableints(priv);
/* There is a race condition here... the event may have completed before
* we get here. In this case waitevents will be zero, but wkupevent will
* be non-zero (and, hopefully, the semaphore count will also be non-zero).
*/
/* Check if the timeout event is specified in the event set */
if ((priv->waitevents & SDIOWAIT_TIMEOUT) != 0)
{
int delay;
/* Yes.. Handle a cornercase */
if (!timeout)
{
return SDIOWAIT_TIMEOUT;
}
/* Start the watchdog timer. I am not sure why this is, but I am
* currently seeing some additional delays when DMA is used.
*/
if (priv->txbusy)
{
/* TX transfers can be VERY long in the worst case */
timeout = MAX(5000, timeout);
}
delay = MSEC2TICK(timeout);
ret = wd_start(priv->waitwdog, delay, (wdentry_t)sam_eventtimeout,
1, (uint32_t)priv);
if (ret != OK)
{
fdbg("ERROR: wd_start failed: %d\n", ret);
}
}
/* Loop until the event (or the timeout occurs). Race conditions are avoided
* by calling sam_waitenable prior to triggering the logic that will cause
* the wait to terminate. Under certain race conditions, the waited-for
* may have already occurred before this function was called!
*/
for (;;)
{
/* Wait for an event in event set to occur. If this the event has already
* occurred, then the semaphore will already have been incremented and
* there will be no wait.
*/
sam_takesem(priv);
wkupevent = priv->wkupevent;
/* Check if the event has occurred. When the event has occurred, then
* evenset will be set to 0 and wkupevent will be set to a nonzero value.
* When wkupevent becomes non-zero, further interrupts will have already
* been disabled.
*/
if (wkupevent != 0)
{
/* Yes... break out of the loop with wkupevent non-zero */
break;
}
}
sam_cmddump(priv);
sam_xfrdump(priv);
return wkupevent;
}
/****************************************************************************
* Name: sam_callbackenable
*
* Description:
* Enable/disable of a set of SDIO callback events. This is part of the
* the SDIO callback sequence. The set of events is configured to enabled
* callbacks to the function provided in sam_registercallback.
*
* Events are automatically disabled once the callback is performed and no
* further callback events will occur until they are again enabled by
* calling this methods.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* eventset - A bitset of events to enable or disable (see SDIOMEDIA_*
* definitions). 0=disable; 1=enable.
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_callbackenable(FAR struct sdio_dev_s *dev,
sdio_eventset_t eventset)
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
fvdbg("eventset: %02x\n", eventset);
DEBUGASSERT(priv != NULL);
priv->cbevents = eventset;
sam_callback(priv);
}
/****************************************************************************
* Name: sam_registercallback
*
* Description:
* Register a callback that that will be invoked on any media status
* change. Callbacks should not be made from interrupt handlers, rather
* interrupt level events should be handled by calling back on the work
* thread.
*
* When this method is called, all callbacks should be disabled until they
* are enabled via a call to SDIO_CALLBACKENABLE.
*
* Input Parameters:
* dev - Device-specific state data
* callback - The funtion to call on the media change
* arg - A caller provided value to return with the callback
*
* Returned Value:
* 0 on success; negated errno on failure.
*
****************************************************************************/
static int sam_registercallback(FAR struct sdio_dev_s *dev,
worker_t callback, void *arg)
{
struct sam_dev_s *priv = (struct sam_dev_s*)dev;
/* Disable callbacks and register this callback and is argument */
fvdbg("Register %p(%p)\n", callback, arg);
DEBUGASSERT(priv != NULL);
priv->cbevents = 0;
priv->cbarg = arg;
priv->callback = callback;
return OK;
}
/****************************************************************************
* Name: sam_dmasupported
*
* Description:
* Return true if the hardware can support DMA
*
* Input Parameters:
* dev - An instance of the SDIO device interface
*
* Returned Value:
* true if DMA is supported.
*
****************************************************************************/
#ifdef CONFIG_SDIO_DMA
static bool sam_dmasupported(FAR struct sdio_dev_s *dev)
{
return true;
}
#endif
/****************************************************************************
* Name: sam_dmarecvsetup
*
* Description:
* Setup to perform a read DMA. If the processor supports a data cache,
* then this method will also make sure that the contents of the DMA memory
* and the data cache are coherent. For read transfers this may mean
* invalidating the data cache.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* buffer - The memory to DMA from
* buflen - The size of the DMA transfer in bytes
*
* Returned Value:
* OK on success; a negated errno on failure
*
****************************************************************************/
#ifndef HSCMI_NORXDMA
static int sam_dmarecvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer,
size_t buflen)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
uint32_t paddr;
uint32_t maddr;
uint32_t regval;
unsigned int blocksize;
unsigned int nblocks;
unsigned int offset;
unsigned int i;
DEBUGASSERT(priv != NULL && buffer != NULL && buflen > 0);
DEBUGASSERT(((uint32_t)buffer & 3) == 0);
/* How many blocks? That should have been saved by the sam_blocksetup()
* method earlier.
*/
regval = sam_getreg(priv, SAM_HSMCI_BLKR_OFFSET);
nblocks = ((regval & HSMCI_BLKR_BCNT_MASK) >> HSMCI_BLKR_BCNT_SHIFT);
blocksize = ((regval & HSMCI_BLKR_BLKLEN_MASK) >> HSMCI_BLKR_BLKLEN_SHIFT);
DEBUGASSERT(nblocks > 0 && blocksize > 0 && (blocksize & 3) == 0);
/* Physical address of the HSCMI source register, either the TDR (for
* single transfers) or the first FIFO register, and the physical address
* of the buffer in RAM.
*/
offset = (nblocks == 1 ? SAM_HSMCI_RDR_OFFSET : SAM_HSMCI_FIFO_OFFSET);
paddr = hsmci_physregaddr(priv, offset);
maddr = sam_physramaddr((uintptr_t)buffer);
/* Setup register sampling (only works for the case of nblocks == 1) */
sam_xfrsampleinit(priv);
sam_xfrsample(priv, SAMPLENDX_BEFORE_SETUP);
/* Set DMA for each block */
for (i = 0; i < nblocks; i++)
{
/* Configure the RX DMA */
sam_dmarxsetup(priv->dma, paddr, maddr, buflen);
/* Update addresses for the next block */
paddr += sizeof(uint32_t);
maddr += blocksize;
}
/* Enable DMA handshaking */
sam_putreg(priv, HSMCI_DMA_DMAEN | HSMCI_DMA_CHKSIZE, SAM_HSMCI_DMA_OFFSET);
sam_xfrsample(priv, SAMPLENDX_BEFORE_ENABLE);
/* Start the DMA */
priv->dmabusy = true;
priv->xfrbusy = true;
priv->txbusy = false;
sam_dmastart(priv->dma, sam_dmacallback, priv);
/* Configure transfer-related interrupts. Transfer interrupts are not
* enabled until after the transfer is started with an SD command (i.e.,
* at the beginning of sam_eventwait().
*/
sam_xfrsample(priv, SAMPLENDX_AFTER_SETUP);
sam_configxfrints(priv, HSMCI_DMARECV_INTS);
return OK;
}
#endif
/****************************************************************************
* Name: sam_dmasendsetup
*
* Description:
* Setup to perform a write DMA. If the processor supports a data cache,
* then this method will also make sure that the contents of the DMA memory
* and the data cache are coherent. For write transfers, this may mean
* flushing the data cache.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* buffer - The memory to DMA into
* buflen - The size of the DMA transfer in bytes
*
* Returned Value:
* OK on success; a negated errno on failure
*
****************************************************************************/
#ifndef HSCMI_NOTXDMA
static int sam_dmasendsetup(FAR struct sdio_dev_s *dev,
FAR const uint8_t *buffer, size_t buflen)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
uint32_t paddr;
uint32_t maddr;
uint32_t regval;
unsigned int blocksize;
unsigned int nblocks;
unsigned int offset;
unsigned int i;
DEBUGASSERT(priv != NULL && buffer != NULL && buflen > 0);
DEBUGASSERT(((uint32_t)buffer & 3) == 0);
/* How many blocks? That should have been saved by the sam_blocksetup()
* method earlier.
*/
regval = sam_getreg(priv, SAM_HSMCI_BLKR_OFFSET);
nblocks = ((regval & HSMCI_BLKR_BCNT_SHIFT) >> HSMCI_BLKR_BCNT_SHIFT);
blocksize = ((regval & HSMCI_BLKR_BLKLEN_MASK) >> HSMCI_BLKR_BLKLEN_SHIFT);
DEBUGASSERT(nblocks > 0 && blocksize > 0 && (blocksize & 3) == 0);
/* Physical address of the HSCMI source register, either the TDR (for
* single transfers) or the first FIFO register, and the physical address
* of the buffer in RAM.
*/
offset = (nblocks == 1 ? SAM_HSMCI_TDR_OFFSET : SAM_HSMCI_FIFO_OFFSET);
paddr = hsmci_physregaddr(priv, offset);
maddr = sam_physramaddr((uintptr_t)buffer);
/* Setup register sampling (only works for the case of nblocks == 1) */
sam_xfrsampleinit(priv);
sam_xfrsample(priv, SAMPLENDX_BEFORE_SETUP);
/* Set DMA for each block */
for (i = 0; i < nblocks; i++)
{
/* Configure the TX DMA */
sam_dmatxsetup(priv->dma, paddr, maddr, buflen);
/* Update addresses for the next block */
paddr += sizeof(uint32_t);
maddr += blocksize;
}
/* Enable DMA handshaking */
sam_putreg(priv, HSMCI_DMA_DMAEN | HSMCI_DMA_CHKSIZE, SAM_HSMCI_DMA_OFFSET);
sam_xfrsample(priv, SAMPLENDX_BEFORE_ENABLE);
/* Start the DMA */
priv->dmabusy = true;
priv->xfrbusy = true;
priv->txbusy = true;
sam_dmastart(priv->dma, sam_dmacallback, priv);
/* Configure transfer-related interrupts. Transfer interrupts are not
* enabled until after the transfer is stard with an SD command (i.e.,
* at the beginning of sam_eventwait().
*/
sam_xfrsample(priv, SAMPLENDX_AFTER_SETUP);
sam_configxfrints(priv, HSMCI_DMASEND_INTS);
return OK;
}
#endif
/****************************************************************************
* Initialization/uninitialization/reset
****************************************************************************/
/****************************************************************************
* Name: sam_callback
*
* Description:
* Perform callback.
*
* Assumptions:
* This function does not execute in the context of an interrupt handler.
* It may be invoked on any user thread or scheduled on the work thread
* from an interrupt handler.
*
****************************************************************************/
static void sam_callback(void *arg)
{
struct sam_dev_s *priv = (struct sam_dev_s*)arg;
irqstate_t flags;
int ret;
/* Is a callback registered? */
DEBUGASSERT(priv != NULL);
fvdbg("Callback %p(%p) cbevents: %02x cdstatus: %02x\n",
priv->callback, priv->cbarg, priv->cbevents, priv->cdstatus);
flags = irqsave();
if (priv->callback)
{
/* Yes.. Check for enabled callback events */
if ((priv->cdstatus & SDIO_STATUS_PRESENT) != 0)
{
/* Media is present. Is the media inserted event enabled? */
if ((priv->cbevents & SDIOMEDIA_INSERTED) == 0)
{
/* No... return without performing the callback */
return;
}
}
else
{
/* Media is not present. Is the media eject event enabled? */
if ((priv->cbevents & SDIOMEDIA_EJECTED) == 0)
{
/* No... return without performing the callback */
return;
}
}
/* Perform the callback, disabling further callbacks. Of course, the
* the callback can (and probably should) re-enable callbacks.
*/
priv->cbevents = 0;
/* This function is called either from (1) the context of the calling
* thread or from the the context of (2) card detection logic. The
* caller may or may not have interrupts disabled (we have them
& disabled here!).
*
* So to minimize the possibility of recursive behavior and to assure
* that callback is always performed outside of the interrupt handling
* context and with interrupts enabled, the callback is always performed
* on the lower priority work thread.
*/
/* First cancel any existing work */
ret = work_cancel(LPWORK, &priv->cbwork);
if (ret < 0)
{
/* NOTE: Currently, work_cancel only returns success */
fdbg("ERROR: Failed to cancel work: %d\n", ret);
}
fllvdbg("Queuing callback to %p(%p)\n", priv->callback, priv->cbarg);
ret = work_queue(LPWORK, &priv->cbwork, (worker_t)priv->callback,
priv->cbarg, 0);
if (ret < 0)
{
/* NOTE: Currently, work_queue only returns success */
fdbg("ERROR: Failed to schedule work: %d\n", ret);
}
}
irqrestore(flags);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sdio_initialize
*
* Description:
* Initialize SD for operation.
*
* Input Parameters:
* slotno - Not used.
*
* Returned Values:
* A reference to an SDIO interface structure. NULL is returned on failures.
*
****************************************************************************/
FAR struct sdio_dev_s *sdio_initialize(int slotno)
{
struct sam_dev_s *priv;
uint32_t pid;
uint8_t dmac;
/* Select the slot and perform slot-specific initialization. The
* semantics here are bad. There are three HSMCI peripherals that we
* will treat as "slots." In principle they could each peripheral could
* support 4 slots, A-D. However, selection of slots B, C, and D is
* listed as "reserved" in the HSMCI register definitions. So, at least
* for now, an* HSMCI peripheral does correspond to a slot.
*/
fdbg("slotno: %d\n", slotno);
#ifdef CONFIG_SAMA5_HSMCI0
if (slotno == 0)
{
/* Select HSMCI0 */
priv = &g_hsmci0;
/* HSMCI0 Initialization */
priv->base = SAM_HSMCI0_VBASE;
priv->hsmci = 0;
/* Configure PIOs for 4-bit, wide-bus operation. NOTE: (1) the chip
* is capable of 8-bit wide bus operation but D4-D7 are not configured,
* (2) any card detection PIOs must be set up in board-specific logic.
*
* REVISIT: What about Slot B?
*/
sam_configpio(PIO_MCI0_DA0); /* Data 0 of Slot A */
sam_configpio(PIO_MCI0_DA1); /* Data 1 of Slot A */
sam_configpio(PIO_MCI0_DA2); /* Data 2 of Slot A */
sam_configpio(PIO_MCI0_DA3); /* Data 3 of Slot A */
sam_configpio(PIO_MCI0_CK); /* Common SD clock */
sam_configpio(PIO_MCI0_CDA); /* Command/Response of Slot A */
/* Enable the HSMCI0 peripheral clock. This really should be done in
* sam_enable (as well as disabling peripheral clocks in sam_disable().
*/
sam_hsmci0_enableclk();
/* For DMA channel selection */
dmac = HSMCI0_DMAC;
pid = SAM_PID_HSMCI0;
}
else
#endif
#ifdef CONFIG_SAMA5_HSMCI1
if (slotno == 1)
{
/* Select HSMCI1 */
priv = &g_hsmci1;
/* HSMCI1 Initialization */
priv->base = SAM_HSMCI1_VBASE;
priv->hsmci = 1;
/* Configure PIOs for 4-bit, wide-bus operation. NOTE: (1) the chip
* is capable of 8-bit wide bus operation but D4-D7 are not configured,
* (2) any card detection PIOs must be set up in board-specific logic.
*
* REVISIT: What about Slot B?
*/
sam_configpio(PIO_MCI1_DA0); /* Data 0 of Slot A */
sam_configpio(PIO_MCI1_DA1); /* Data 1 of Slot A */
sam_configpio(PIO_MCI1_DA2); /* Data 2 of Slot A */
sam_configpio(PIO_MCI1_DA3); /* Data 3 of Slot A */
sam_configpio(PIO_MCI1_CK); /* Common SD clock */
sam_configpio(PIO_MCI1_CDA); /* Command/Response of Slot A */
/* Enable the HSMCI1 peripheral clock This really should be done in
* sam_enable (as well as disabling peripheral clocks in sam_disable().
*/
sam_hsmci1_enableclk();
/* For DMA channel selection */
dmac = HSMCI1_DMAC;
pid = SAM_PID_HSMCI1;
}
else
#endif
#ifdef CONFIG_SAMA5_HSMCI2
if (slotno == 2)
{
/* Select HSMCI2 */
priv = &g_hsmci2;
/* HSMCI2 Initialization */
priv->base = SAM_HSMCI2_VBASE;
priv->hsmci = 2;
/* Configure PIOs for 4-bit, wide-bus operation. NOTE: (1) the chip
* is capable of 8-bit wide bus operation but D4-D7 are not configured,
* (2) any card detection PIOs must be set up in board-specific logic.
*
* REVISIT: What about Slot B?
*/
sam_configpio(PIO_MCI2_DA0); /* Data 0 of Slot A */
sam_configpio(PIO_MCI2_DA1); /* Data 1 of Slot A */
sam_configpio(PIO_MCI2_DA2); /* Data 2 of Slot A */
sam_configpio(PIO_MCI1_DA3); /* Data 3 of Slot A */
sam_configpio(PIO_MCI2_CK); /* Common SD clock */
sam_configpio(PIO_MCI2_CDA); /* Command/Response of Slot A */
/* Enable the HSMCI2 peripheral clock This really should be done in
* sam_enable (as well as disabling peripheral clocks in sam_disable().
*/
sam_hsmci1_enableclk();
/* For DMA channel selection */
dmac = HSMCI2_DMAC;
pid = SAM_PID_HSMCI2;
}
else
#endif
{
DEBUGPANIC();
return NULL;
}
fvdbg("priv: %p base: %08x hsmci: %d dmac: %d pid: %d\n",
priv, priv->base, priv->hsmci, dmac, pid);
/* Initialize the HSMCI slot structure */
sem_init(&priv->waitsem, 0, 0);
priv->waitwdog = wd_create();
DEBUGASSERT(priv->waitwdog);
/* Initialize the callbacks */
memcpy(&priv->dev, &g_callbacks, sizeof(struct sdio_dev_s));
/* Allocate a DMA channel */
priv->dma = sam_dmachannel(dmac, DMA_FLAGS(pid));
DEBUGASSERT(priv->dma);
/* Reset the card and assure that it is in the initial, unconfigured
* state.
*/
sam_reset(&priv->dev);
return &priv->dev;
}
/****************************************************************************
* Name: sdio_mediachange
*
* Description:
* Called by board-specific logic -- possibly from an interrupt handler --
* in order to signal to the driver that a card has been inserted or
* removed from the slot
*
* Input Parameters:
* dev - An instance of the SDIO driver device state structure.
* cardinslot - true is a card has been detected in the slot; false if a
* card has been removed from the slot. Only transitions
* (inserted->removed or removed->inserted should be reported)
*
* Returned Values:
* None
*
* Assumptions:
* May be called from an interrupt handler.
*
****************************************************************************/
void sdio_mediachange(FAR struct sdio_dev_s *dev, bool cardinslot)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
uint8_t cdstatus;
irqstate_t flags;
/* Update card status. Interrupts are disabled here because if we are
* not called from an interrupt handler, then the following steps must
* still be atomic.
*/
flags = irqsave();
cdstatus = priv->cdstatus;
if (cardinslot)
{
priv->cdstatus |= SDIO_STATUS_PRESENT;
}
else
{
priv->cdstatus &= ~SDIO_STATUS_PRESENT;
}
fllvdbg("cdstatus OLD: %02x NEW: %02x\n", cdstatus, priv->cdstatus);
/* Perform any requested callback if the status has changed */
if (cdstatus != priv->cdstatus)
{
sam_callback(priv);
}
irqrestore(flags);
}
/****************************************************************************
* Name: sdio_wrprotect
*
* Description:
* Called by board-specific logic to report if the card in the slot is
* mechanically write protected.
*
* Input Parameters:
* dev - An instance of the SDIO driver device state structure.
* wrprotect - true is a card is write protected.
*
* Returned Values:
* None
*
****************************************************************************/
void sdio_wrprotect(FAR struct sdio_dev_s *dev, bool wrprotect)
{
struct sam_dev_s *priv = (struct sam_dev_s *)dev;
irqstate_t flags;
/* Update card status */
flags = irqsave();
if (wrprotect)
{
priv->cdstatus |= SDIO_STATUS_WRPROTECTED;
}
else
{
priv->cdstatus &= ~SDIO_STATUS_WRPROTECTED;
}
fvdbg("cdstatus: %02x\n", priv->cdstatus);
irqrestore(flags);
}
#endif /* CONFIG_SAMA5_HSMCI0 || CONFIG_SAMA5_HSMCI1 || CONFIG_SAMA5_HSMCI2 */
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