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nuttx/arch/arm/src/kinetis/kinetis_sdhc.c

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/****************************************************************************
* arch/arm/src/kinetis/kinetis_sdhc.c
*
* Copyright (C) 2011-2012 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 "kinetis_internal.h"
#include "kinetis_pinmux.h"
#include "kinetis_sim.h"
#include "kinetis_sdhc.h"
#if CONFIG_KINETIS_SDHC
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifndef CONFIG_SDIO_DMA
# warning "Large Non-DMA transfer may result in RX overrun failures"
#endif
#ifndef CONFIG_SCHED_WORKQUEUE
# error "Callback support requires CONFIG_SCHED_WORKQUEUE"
#endif
#ifndef CONFIG_KINETIS_SDHC_PRIO
# define CONFIG_KINETIS_SDHC_PRIO NVIC_SYSH_PRIORITY_DEFAULT
#endif
#ifndef CONFIG_KINETIS_SDHC_DMAPRIO
# define CONFIG_KINETIS_SDHC_DMAPRIO DMA_CCR_PRIMED
#endif
#if !defined(CONFIG_DEBUG_FS) || !defined(CONFIG_DEBUG_VERBOSE)
# undef CONFIG_SDIO_XFRDEBUG
#endif
/* SDCLK frequencies corresponding to various modes of operation. These
* values may be provided in either the NuttX configuration file or in
* the board.h file
*
* NOTE: These settings are not currently used. Since there are only four
* frequencies, it makes more sense to just "can" the fixed frequency prescaler
* and divider values.
*/
#if CONFIG_KINETIS_SDHC_ABSFREQ
# ifndef CONFIG_KINETIS_IDMODE_FREQ
# define CONFIG_KINETIS_IDMODE_FREQ 400000 /* 400 KHz, ID mode */
# endif
# ifndef CONFIG_KINETIS_MMCXFR_FREQ
# define CONFIG_KINETIS_MMCXFR_FREQ 20000000 /* 20MHz MMC, normal clocking */
# endif
# ifndef CONFIG_KINETIS_SD1BIT_FREQ
# define CONFIG_KINETIS_SD1BIT_FREQ 20000000 /* 20MHz SD 1-bit, normal clocking */
# endif
# ifndef CONFIG_KINETIS_SD4BIT_FREQ
# define CONFIG_KINETIS_SD4BIT_FREQ 25000000 /* 25MHz SD 4-bit, normal clocking */
# endif
#endif
/* Timing */
#define SDHC_CMDTIMEOUT (100000)
#define SDHC_LONGTIMEOUT (0x7fffffff)
/* Big DVS setting. Range is 0=SDCLK*213 through 14=SDCLK*227 */
#define SDHC_DVS_MAXTIMEOUT (14)
#define SDHC_DVS_DATATIMEOUT (14)
/* Maximum watermark value */
#define SDHC_MAX_WATERMARK 128
/* Data transfer / Event waiting interrupt mask bits */
#define SDHC_RESPERR_INTS (SDHC_INT_CCE|SDHC_INT_CTOE|SDHC_INT_CEBE|SDHC_INT_CIE)
#define SDHC_RESPDONE_INTS (SDHC_RESPERR_INTS|SDHC_INT_CC)
#define SCHC_XFRERR_INTS (SDHC_INT_DCE|SDHC_INT_DTOE|SDHC_INT_DEBE)
#define SDHC_RCVDONE_INTS (SCHC_XFRERR_INTS|SDHC_INT_BRR|SDHC_INT_TC)
#define SDHC_SNDDONE_INTS (SCHC_XFRERR_INTS|SDHC_INT_BWR|SDHC_INT_TC)
#define SDHC_XFRDONE_INTS (SCHC_XFRERR_INTS|SDHC_INT_BRR|SDHC_INT_BWR|SDHC_INT_TC)
#define SCHC_DMAERR_INTS (SDHC_INT_DCE|SDHC_INT_DTOE|SDHC_INT_DEBE|SDHC_INT_DMAE)
#define SDHC_DMADONE_INTS (SCHC_DMAERR_INTS|SDHC_INT_DINT)
#define SDHC_WAITALL_INTS (SDHC_RESPDONE_INTS|SDHC_XFRDONE_INTS|SDHC_DMADONE_INTS)
/* Register logging support */
#ifdef CONFIG_SDIO_XFRDEBUG
# define SAMPLENDX_BEFORE_SETUP 0
# define SAMPLENDX_AFTER_SETUP 1
# define SAMPLENDX_END_TRANSFER 2
# define DEBUG_NSAMPLES 3
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure defines the state of the Kinetis SDIO interface */
struct kinetis_dev_s
{
struct sdio_dev_s dev; /* Standard, base SDIO interface */
/* Kinetis-specific extensions */
/* Event support */
sem_t waitsem; /* Implements event waiting */
sdio_eventset_t waitevents; /* Set of events to be waited for */
uint32_t waitints; /* Interrupt enables for event waiting */
volatile sdio_eventset_t wkupevent; /* The event that caused the wakeup */
WDOG_ID waitwdog; /* Watchdog that handles event timeouts */
/* 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 *buffer; /* Address of current R/W buffer */
size_t remaining; /* Number of bytes remaining in the transfer */
uint32_t xfrints; /* Interrupt enables for data transfer */
/* DMA data transfer support */
#ifdef CONFIG_SDIO_DMA
volatile uint8_t xfrflags; /* Used to synchronize SDIO and DMA completion events */
#endif
};
/* Register logging support */
#ifdef CONFIG_SDIO_XFRDEBUG
struct kinetis_sdhcregs_s
{
/* All read-able SDHC registers */
uint32_t dsaddr; /* DMA System Address Register */
uint32_t blkattr; /* Block Attributes Register */
uint32_t cmdarg; /* Command Argument Register */
uint32_t xferty; /* Transfer Type Register */
uint32_t cmdrsp0; /* Command Response 0 */
uint32_t cmdrsp1; /* Command Response 1 */
uint32_t cmdrsp2; /* Command Response 2 */
uint32_t cmdrsp3; /* Command Response 3 */
uint32_t prsstat; /* Present State Register */
uint32_t proctl; /* Protocol Control Register */
uint32_t sysctl; /* System Control Register */
uint32_t irqstat; /* Interrupt Status Register */
uint32_t irqstaten; /* Interrupt Status Enable Register */
uint32_t irqsigen; /* Interrupt Signal Enable Register */
uint32_t ac12err; /* Auto CMD12 Error Status Register */
uint32_t htcapblt; /* Host Controller Capabilities */
uint32_t wml; /* Watermark Level Register */
uint32_t admaes; /* ADMA Error Status Register */
uint32_t adsaddr; /* ADMA System Address Register */
uint32_t vendor; /* Vendor Specific Register */
uint32_t mmcboot; /* MMC Boot Register */
uint32_t hostver; /* Host Controller Version */
};
#endif
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Low-level helpers ********************************************************/
static void kinetis_takesem(struct kinetis_dev_s *priv);
#define kinetis_givesem(priv) (sem_post(&priv->waitsem))
static void kinetis_configwaitints(struct kinetis_dev_s *priv, uint32_t waitints,
sdio_eventset_t waitevents, sdio_eventset_t wkupevents);
static void kinetis_configxfrints(struct kinetis_dev_s *priv, uint32_t xfrints);
/* DMA Helpers **************************************************************/
#ifdef CONFIG_SDIO_XFRDEBUG
static void kinetis_sampleinit(void);
static void kinetis_sdhcsample(struct kinetis_sdhcregs_s *regs);
static void kinetis_sample(struct kinetis_dev_s *priv, int index);
static void kinetis_dumpsample(struct kinetis_dev_s *priv,
struct kinetis_sdhcregs_s *regs, const char *msg);
static void kinetis_dumpsamples(struct kinetis_dev_s *priv);
static void kinetis_showregs(struct kinetis_dev_s *priv, const char *msg);
#else
# define kinetis_sampleinit()
# define kinetis_sample(priv,index)
# define kinetis_dumpsamples(priv)
# define kinetis_showregs(priv,msg)
#endif
/* Data Transfer Helpers ****************************************************/
static void kinetis_dataconfig(struct kinetis_dev_s *priv, bool bwrite,
unsigned int blocksize, unsigned int nblocks,
unsigned int timeout);
static void kinetis_datadisable(void);
#ifndef CONFIG_SDIO_DMA
static void kinetis_transmit(struct kinetis_dev_s *priv);
static void kinetis_receive(struct kinetis_dev_s *priv);
#endif
static void kinetis_eventtimeout(int argc, uint32_t arg);
static void kinetis_endwait(struct kinetis_dev_s *priv, sdio_eventset_t wkupevent);
static void kinetis_endtransfer(struct kinetis_dev_s *priv, sdio_eventset_t wkupevent);
/* Interrupt Handling *******************************************************/
static int kinetis_interrupt(int irq, void *context);
/* SDIO interface methods ***************************************************/
/* Mutual exclusion */
#ifdef CONFIG_SDIO_MUXBUS
static int kinetis_lock(FAR struct sdio_dev_s *dev, bool lock);
#endif
/* Initialization/setup */
static void kinetis_reset(FAR struct sdio_dev_s *dev);
static uint8_t kinetis_status(FAR struct sdio_dev_s *dev);
static void kinetis_widebus(FAR struct sdio_dev_s *dev, bool enable);
#if CONFIG_KINETIS_SDHC_ABSFREQ
static void kinetis_frequency(FAR struct sdio_dev_s *dev, uint32_t frequency);
#endif
static void kinetis_clock(FAR struct sdio_dev_s *dev,
enum sdio_clock_e rate);
static int kinetis_attach(FAR struct sdio_dev_s *dev);
/* Command/Status/Data Transfer */
static int kinetis_sendcmd(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t arg);
#ifndef CONFIG_SDIO_DMA
static int kinetis_recvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer,
size_t nbytes);
static int kinetis_sendsetup(FAR struct sdio_dev_s *dev,
FAR const uint8_t *buffer, uint32_t nbytes);
#endif
static int kinetis_cancel(FAR struct sdio_dev_s *dev);
static int kinetis_waitresponse(FAR struct sdio_dev_s *dev, uint32_t cmd);
static int kinetis_recvshortcrc(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t *rshort);
static int kinetis_recvlong(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t rlong[4]);
static int kinetis_recvshort(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t *rshort);
static int kinetis_recvnotimpl(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t *rnotimpl);
/* EVENT handler */
static void kinetis_waitenable(FAR struct sdio_dev_s *dev,
sdio_eventset_t eventset);
static sdio_eventset_t
kinetis_eventwait(FAR struct sdio_dev_s *dev, uint32_t timeout);
static void kinetis_callbackenable(FAR struct sdio_dev_s *dev,
sdio_eventset_t eventset);
static int kinetis_registercallback(FAR struct sdio_dev_s *dev,
worker_t callback, void *arg);
/* DMA */
#ifdef CONFIG_SDIO_DMA
static bool kinetis_dmasupported(FAR struct sdio_dev_s *dev);
static int kinetis_dmarecvsetup(FAR struct sdio_dev_s *dev,
FAR uint8_t *buffer, size_t buflen);
static int kinetis_dmasendsetup(FAR struct sdio_dev_s *dev,
FAR const uint8_t *buffer, size_t buflen);
#endif
/* Initialization/uninitialization/reset ************************************/
static void kinetis_callback(void *arg);
/****************************************************************************
* Private Data
****************************************************************************/
struct kinetis_dev_s g_sdhcdev =
{
.dev =
{
#ifdef CONFIG_SDIO_MUXBUS
.lock = kinetis_lock,
#endif
.reset = kinetis_reset,
.status = kinetis_status,
.widebus = kinetis_widebus,
.clock = kinetis_clock,
.attach = kinetis_attach,
.sendcmd = kinetis_sendcmd,
#ifndef CONFIG_SDIO_DMA
.recvsetup = kinetis_recvsetup,
.sendsetup = kinetis_sendsetup,
#else
.recvsetup = kinetis_dmarecvsetup,
.sendsetup = kinetis_dmasendsetup,
#endif
.cancel = kinetis_cancel,
.waitresponse = kinetis_waitresponse,
.recvR1 = kinetis_recvshortcrc,
.recvR2 = kinetis_recvlong,
.recvR3 = kinetis_recvshort,
.recvR4 = kinetis_recvnotimpl,
.recvR5 = kinetis_recvnotimpl,
.recvR6 = kinetis_recvshortcrc,
.recvR7 = kinetis_recvshort,
.waitenable = kinetis_waitenable,
.eventwait = kinetis_eventwait,
.callbackenable = kinetis_callbackenable,
.registercallback = kinetis_registercallback,
#ifdef CONFIG_SDIO_DMA
.dmasupported = kinetis_dmasupported,
.dmarecvsetup = kinetis_dmarecvsetup,
.dmasendsetup = kinetis_dmasendsetup,
#endif
},
};
/* Register logging support */
#ifdef CONFIG_SDIO_XFRDEBUG
static struct kinetis_sdhcregs_s g_sampleregs[DEBUG_NSAMPLES];
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Low-level Helpers
****************************************************************************/
/****************************************************************************
* Name: kinetis_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 kinetis_takesem(struct kinetis_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: kinetis_configwaitints
*
* Description:
* Enable/disable SDIO interrupts needed to suport the wait function
*
* Input Parameters:
* priv - A reference to the SDIO device state structure
* waitints - The set of bits in the SDIO MASK register to set
* waitevents - Waited for events
* wkupevent - Wake-up events
*
* Returned Value:
* None
*
****************************************************************************/
static void kinetis_configwaitints(struct kinetis_dev_s *priv, uint32_t waitints,
sdio_eventset_t waitevents,
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 = waitevents;
priv->wkupevent = wkupevent;
priv->waitints = waitints;
#ifdef CONFIG_SDIO_DMA
priv->xfrflags = 0;
#endif
putreg32(priv->xfrints | priv->waitints | SDHC_INT_CINT,
KINETIS_SDHC_IRQSIGEN);
irqrestore(flags);
}
/****************************************************************************
* Name: kinetis_configxfrints
*
* Description:
* Enable SDIO interrupts needed to support the data transfer event
*
* Input Parameters:
* priv - A reference to the SDIO device state structure
* xfrints - The set of bits in the SDIO MASK register to set
*
* Returned Value:
* None
*
****************************************************************************/
static void kinetis_configxfrints(struct kinetis_dev_s *priv, uint32_t xfrints)
{
irqstate_t flags;
flags = irqsave();
priv->xfrints = xfrints;
putreg32(priv->xfrints | priv->waitints | SDHC_INT_CINT,
KINETIS_SDHC_IRQSIGEN);
irqrestore(flags);
}
/****************************************************************************
* DMA Helpers
****************************************************************************/
/****************************************************************************
* Name: kinetis_sampleinit
*
* Description:
* Setup prior to collecting DMA samples
*
****************************************************************************/
#ifdef CONFIG_SDIO_XFRDEBUG
static void kinetis_sampleinit(void)
{
memset(g_sampleregs, 0xff, DEBUG_NSAMPLES * sizeof(struct kinetis_sdhcregs_s));
}
#endif
/****************************************************************************
* Name: kinetis_sdhcsample
*
* Description:
* Sample SDIO registers
*
****************************************************************************/
#ifdef CONFIG_SDIO_XFRDEBUG
static void kinetis_sdhcsample(struct kinetis_sdhcregs_s *regs)
{
regs->dsaddr = getreg32(KINETIS_SDHC_DSADDR); /* DMA System Address Register */
regs->blkattr = getreg32(KINETIS_SDHC_BLKATTR); /* Block Attributes Register */
regs->cmdarg = getreg32(KINETIS_SDHC_CMDARG); /* Command Argument Register */
regs->xferty = getreg32(KINETIS_SDHC_XFERTYP); /* Transfer Type Register */
regs->cmdrsp0 = getreg32(KINETIS_SDHC_CMDRSP0); /* Command Response 0 */
regs->cmdrsp1 = getreg32(KINETIS_SDHC_CMDRSP1); /* Command Response 1 */
regs->cmdrsp2 = getreg32(KINETIS_SDHC_CMDRSP2); /* Command Response 2 */
regs->cmdrsp3 = getreg32(KINETIS_SDHC_CMDRSP3); /* Command Response 3 */
regs->prsstat = getreg32(KINETIS_SDHC_PRSSTAT); /* Present State Register */
regs->proctl = getreg32(KINETIS_SDHC_PROCTL); /* Protocol Control Register */
regs->sysctl = getreg32(KINETIS_SDHC_SYSCTL); /* System Control Register */
regs->irqstat = getreg32(KINETIS_SDHC_IRQSTAT); /* Interrupt Status Register */
regs->irqstaten = getreg32(KINETIS_SDHC_IRQSTATEN); /* Interrupt Status Enable Register */
regs->irqsigen = getreg32(KINETIS_SDHC_IRQSIGEN); /* Interrupt Signal Enable Register */
regs->ac12err = getreg32(KINETIS_SDHC_AC12ERR); /* Auto CMD12 Error Status Register */
regs->htcapblt = getreg32(KINETIS_SDHC_HTCAPBLT); /* Host Controller Capabilities */
regs->wml = getreg32(KINETIS_SDHC_WML); /* Watermark Level Register */
regs->admaes = getreg32(KINETIS_SDHC_ADMAES); /* ADMA Error Status Register */
regs->adsaddr = getreg32(KINETIS_SDHC_ADSADDR); /* ADMA System Address Register */
regs->vendor = getreg32(KINETIS_SDHC_VENDOR); /* Vendor Specific Register */
regs->mmcboot = getreg32(KINETIS_SDHC_MMCBOOT); /* MMC Boot Register */
regs->hostver = getreg32(KINETIS_SDHC_HOSTVER); /* Host Controller Version */
}
#endif
/****************************************************************************
* Name: kinetis_sample
*
* Description:
* Sample SDIO/DMA registers
*
****************************************************************************/
#ifdef CONFIG_SDIO_XFRDEBUG
static void kinetis_sample(struct kinetis_dev_s *priv, int index)
{
kinetis_sdhcsample(&g_sampleregs[index]);
}
#endif
/****************************************************************************
* Name: kinetis_dumpsample
*
* Description:
* Dump one register sample
*
****************************************************************************/
#ifdef CONFIG_SDIO_XFRDEBUG
static void kinetis_dumpsample(struct kinetis_dev_s *priv,
struct kinetis_sdhcregs_s *regs, const char *msg)
{
fdbg("SDHC Registers: %s\n", msg);
fdbg(" DSADDR[%08x]: %08x\n", KINETIS_SDHC_DSADDR, regs->dsaddr);
fdbg(" BLKATTR[%08x]: %08x\n", KINETIS_SDHC_BLKATTR, regs->blkattr);
fdbg(" CMDARG[%08x]: %08x\n", KINETIS_SDHC_CMDARG, regs->cmdarg);
fdbg(" XFERTY[%08x]: %08x\n", KINETIS_SDHC_XFERTYP, regs->xferty);
fdbg(" CMDRSP0[%08x]: %08x\n", KINETIS_SDHC_CMDRSP0, regs->cmdrsp0);
fdbg(" CMDRSP1[%08x]: %08x\n", KINETIS_SDHC_CMDRSP1, regs->cmdrsp1);
fdbg(" CMDRSP2[%08x]: %08x\n", KINETIS_SDHC_CMDRSP2, regs->cmdrsp2);
fdbg(" CMDRSP3[%08x]: %08x\n", KINETIS_SDHC_CMDRSP3, regs->cmdrsp3);
fdbg(" PRSSTAT[%08x]: %08x\n", KINETIS_SDHC_PRSSTAT, regs->prsstat);
fdbg(" PROCTL[%08x]: %08x\n", KINETIS_SDHC_PROCTL, regs->proctl);
fdbg(" SYSCTL[%08x]: %08x\n", KINETIS_SDHC_SYSCTL, regs->sysctl);
fdbg(" IRQSTAT[%08x]: %08x\n", KINETIS_SDHC_IRQSTAT, regs->irqstat);
fdbg("IRQSTATEN[%08x]: %08x\n", KINETIS_SDHC_IRQSTATEN, regs->irqstaten);
fdbg(" IRQSIGEN[%08x]: %08x\n", KINETIS_SDHC_IRQSIGEN, regs->irqsigen);
fdbg(" AC12ERR[%08x]: %08x\n", KINETIS_SDHC_AC12ERR, regs->ac12err);
fdbg(" HTCAPBLT[%08x]: %08x\n", KINETIS_SDHC_HTCAPBLT, regs->htcapblt);
fdbg(" WML[%08x]: %08x\n", KINETIS_SDHC_WML, regs->wml);
fdbg(" ADMAES[%08x]: %08x\n", KINETIS_SDHC_ADMAES, regs->admaes);
fdbg(" ADSADDR[%08x]: %08x\n", KINETIS_SDHC_ADSADDR, regs->adsaddr);
fdbg(" VENDOR[%08x]: %08x\n", KINETIS_SDHC_VENDOR, regs->vendor);
fdbg(" MMCBOOT[%08x]: %08x\n", KINETIS_SDHC_MMCBOOT, regs->mmcboot);
fdbg(" HOSTVER[%08x]: %08x\n", KINETIS_SDHC_HOSTVER, regs->hostver);
}
#endif
/****************************************************************************
* Name: kinetis_dumpsamples
*
* Description:
* Dump all sampled register data
*
****************************************************************************/
#ifdef CONFIG_SDIO_XFRDEBUG
static void kinetis_dumpsamples(struct kinetis_dev_s *priv)
{
kinetis_dumpsample(priv, &g_sampleregs[SAMPLENDX_BEFORE_SETUP], "Before setup");
kinetis_dumpsample(priv, &g_sampleregs[SAMPLENDX_AFTER_SETUP], "After setup");
kinetis_dumpsample(priv, &g_sampleregs[SAMPLENDX_END_TRANSFER], "End of transfer");
}
#endif
/****************************************************************************
* Name: kinetis_showregs
*
* Description:
* Dump the current state of all registers
*
****************************************************************************/
#ifdef CONFIG_SDIO_XFRDEBUG
static void kinetis_showregs(struct kinetis_dev_s *priv, const char *msg)
{
struct kinetis_sdhcregs_s regs;
kinetis_sdhcsample(&regs);
kinetis_dumpsample(priv, &regs, msg);
}
#endif
/****************************************************************************
* Data Transfer Helpers
****************************************************************************/
/****************************************************************************
* Name: kinetis_dataconfig
*
* Description:
* Configure the SDIO data path for the next data transfer
*
****************************************************************************/
static void kinetis_dataconfig(struct kinetis_dev_s *priv, bool bwrite,
unsigned int blocksize, unsigned int nblocks,
unsigned int timeout)
{
unsigned int watermark;
uint32_t regval = 0;
/* Set the data timeout value in the SDHC_SYSCTL field to the selected value */
regval = getreg32(KINETIS_SDHC_SYSCTL);
regval &= ~SDHC_SYSCTL_DVS_MASK;
regval |= timeout << SDHC_SYSCTL_DVS_SHIFT;
putreg32(regval, KINETIS_SDHC_SYSCTL);
/* Set the block size and count in the SDHC_BLKATTR register. The block
* size is only valid for multiple block transfers.
*/
regval = blocksize << SDHC_BLKATTR_SIZE_SHIFT |
nblocks << SDHC_BLKATTR_CNT_SHIFT;
putreg32(regval, KINETIS_SDHC_BLKATTR);
/* Set the watermark level */
#ifdef CONFIG_SDIO_DMA
/* Set the Read Watermark Level to the blocksize to be read
* (limited to half of the maximum watermark value). BRR will be
* set when the number of queued words is greater than or equal
* to this value.
*/
watermark = (blocksize + 3) >> 2;
if (watermark > (SDHC_MAX_WATERMARK / 2))
{
watermark = (SDHC_MAX_WATERMARK / 2);
}
/* When the watermark level requirement is met in data transfer, and the
* internal DMA is enabled, the data buffer block sends a DMA request to
* the crossbar switch interface.
*/
if (bwrite)
{
/* The SDHC will not start data transmission until the number of
* words set in the WML register can be held in the buffer. If the
* buffer is empty and the host system does not write data in time,
* the SDHC will stop the SD_CLK to avoid the data buffer under-run
* situation.
*/
putreg32(watermark << SDHC_WML_WR_SHIFT, KINETIS_SDHC_WML);
}
else
{
/* The SDHC will not start data transmission until the number of
* words set in the WML register are in the buffer. If the buffer
* is full and the Host System does not read data in time, the
* SDHC will stop the SDHC_DCLK to avoid the data buffer over-run
* situation.
*/
putreg32(watermark << SDHC_WML_RD_SHIFT, KINETIS_SDHC_WML);
}
#else
if (bwrite)
{
/* Write Watermark Level = 0: BWR will be set when the number of
* queued words is less than or equal to 0.
*/
putreg32(0, KINETIS_SDHC_WML);
}
else
{
/* Set the Read Watermark Level to the blocksize to be read
* (limited to half of the maximum watermark value). BRR will be
* set when the number of queued words is greater than or equal
* to this value.
*/
watermark = (blocksize + 3) >> 2;
if (watermark > (SDHC_MAX_WATERMARK / 2))
{
watermark = (SDHC_MAX_WATERMARK / 2);
}
putreg32(watermark << SDHC_WML_RD_SHIFT, KINETIS_SDHC_WML);
}
#endif
}
/****************************************************************************
* Name: kinetis_datadisable
*
* Description:
* Disable the SDIO data path setup by kinetis_dataconfig() and
* disable DMA.
*
****************************************************************************/
static void kinetis_datadisable(void)
{
uint32_t regval;
/* Set the data timeout value in the SDHC_SYSCTL field to the maximum value */
regval = getreg32(KINETIS_SDHC_SYSCTL);
regval &= ~SDHC_SYSCTL_DVS_MASK;
regval |= SDHC_DVS_MAXTIMEOUT << SDHC_SYSCTL_DVS_SHIFT;
putreg32(regval, KINETIS_SDHC_SYSCTL);
/* Set the block size to zero (no transfer) */
putreg32(0, KINETIS_SDHC_BLKATTR);
}
/****************************************************************************
* Name: kinetis_transmit
*
* Description:
* Send SDIO data in interrupt mode
*
* Input Parameters:
* priv - An instance of the SDIO device interface
*
* Returned Value:
* None
*
****************************************************************************/
#ifndef CONFIG_SDIO_DMA
static void kinetis_transmit(struct kinetis_dev_s *priv)
{
union
{
uint32_t w;
uint8_t b[4];
} data;
/* Loop while there is more data to be sent, waiting for buffer write
* ready (BWR)
*/
fllvdbg("Entry: remaining: %d IRQSTAT: %08x\n",
priv->remaining, getreg32(KINETIS_SDHC_IRQSTAT));
while (priv->remaining > 0 &&
(getreg32(KINETIS_SDHC_IRQSTAT) & SDHC_INT_BWR) != 0)
{
/* Clear BWR. If there is more data in the buffer, writing to the
* buffer should reset BRR.
*/
putreg32(SDHC_INT_BWR, KINETIS_SDHC_IRQSTAT);
/* Is there a full word remaining in the user buffer? */
if (priv->remaining >= sizeof(uint32_t))
{
/* Yes, transfer the word to the TX FIFO */
data.w = *priv->buffer++;
priv->remaining -= sizeof(uint32_t);
}
else
{
/* No.. transfer just the bytes remaining in the user buffer,
* padding with zero as necessary to extend to a full word.
*/
uint8_t *ptr = (uint8_t *)priv->remaining;
int i;
data.w = 0;
for (i = 0; i < priv->remaining; i++)
{
data.b[i] = *ptr++;
}
/* Now the transfer is finished */
priv->remaining = 0;
}
/* Put the word in the FIFO */
putreg32(data.w, KINETIS_SDHC_DATPORT);
}
fllvdbg("Exit: remaining: %d IRQSTAT: %08x\n",
priv->remaining, getreg32(KINETIS_SDHC_IRQSTAT));
}
#endif
/****************************************************************************
* Name: kinetis_receive
*
* Description:
* Receive SDIO data in interrupt mode
*
* Input Parameters:
* priv - An instance of the SDIO device interface
*
* Returned Value:
* None
*
****************************************************************************/
#ifndef CONFIG_SDIO_DMA
static void kinetis_receive(struct kinetis_dev_s *priv)
{
unsigned int watermark;
union
{
uint32_t w;
uint8_t b[4];
} data;
/* Set the Read Watermark Level to 1: BRR will be set when the number of
* queued words is greater than or equal to 1.
*/
putreg32(1 << SDHC_WML_RD_SHIFT, KINETIS_SDHC_WML);
/* Loop while there is space to store the data, waiting for buffer read
* ready (BRR)
*/
fllvdbg("Entry: remaining: %d IRQSTAT: %08x\n",
priv->remaining, getreg32(KINETIS_SDHC_IRQSTAT));
while (priv->remaining > 0 &&
(getreg32(KINETIS_SDHC_IRQSTAT) & SDHC_INT_BRR) != 0)
{
/* Clear BRR. If there is more data in the buffer, reading from the
* buffer should reset BRR.
*/
putreg32(SDHC_INT_BRR, KINETIS_SDHC_IRQSTAT);
/* Read the next word from the RX buffer */
data.w = getreg32(KINETIS_SDHC_DATPORT);
if (priv->remaining >= sizeof(uint32_t))
{
/* Transfer the whole word to the user buffer */
*priv->buffer++ = data.w;
priv->remaining -= sizeof(uint32_t);
}
else
{
/* Transfer any trailing fractional word */
uint8_t *ptr = (uint8_t*)priv->buffer;
int i;
for (i = 0; i < priv->remaining; i++)
{
*ptr++ = data.b[i];
}
/* Now the transfer is finished */
priv->remaining = 0;
}
}
/* Set the Read Watermark Level either the number of remaining words to be
* read (limited to half of the maximum watermark value)
*/
watermark = ((priv->remaining + 3) >> 2);
if (watermark > (SDHC_MAX_WATERMARK / 2))
{
watermark = (SDHC_MAX_WATERMARK / 2);
}
putreg32(watermark << SDHC_WML_RD_SHIFT, KINETIS_SDHC_WML);
fllvdbg("Exit: remaining: %d IRQSTAT: %08x WML: %08x\n",
priv->remaining, getreg32(KINETIS_SDHC_IRQSTAT),
getreg32(KINETIS_SDHC_WML));
}
#endif
/****************************************************************************
* Name: kinetis_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 kinetis_eventtimeout(int argc, uint32_t arg)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s *)arg;
DEBUGASSERT(argc == 1 && priv != NULL);
DEBUGASSERT((priv->waitevents & SDIOWAIT_TIMEOUT) != 0);
/* Is a data transfer complete event expected? */
if ((priv->waitevents & SDIOWAIT_TIMEOUT) != 0)
{
/* Yes.. Sample registers at the time of the timeout */
kinetis_sample(priv, SAMPLENDX_END_TRANSFER);
/* Wake up any waiting threads */
kinetis_endwait(priv, SDIOWAIT_TIMEOUT);
flldbg("Timeout: remaining: %d\n", priv->remaining);
}
}
/****************************************************************************
* Name: kinetis_endwait
*
* Description:
* Wake up a waiting thread if the waited-for event has occurred.
*
* Input Parameters:
* priv - An instance of the SDIO 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 kinetis_endwait(struct kinetis_dev_s *priv, sdio_eventset_t wkupevent)
{
/* Cancel the watchdog timeout */
(void)wd_cancel(priv->waitwdog);
/* Disable event-related interrupts */
kinetis_configwaitints(priv, 0, 0, wkupevent);
/* Wake up the waiting thread */
kinetis_givesem(priv);
}
/****************************************************************************
* Name: kinetis_endtransfer
*
* Description:
* Terminate a transfer with the provided status. This function is called
* only from the SDIO interrupt handler when end-of-transfer conditions
* are detected.
*
* Input Parameters:
* priv - An instance of the SDIO 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 kinetis_endtransfer(struct kinetis_dev_s *priv, sdio_eventset_t wkupevent)
{
#ifdef CONFIG_SDIO_DMA
uint32_t regval;
#endif
/* Disable all transfer related interrupts */
kinetis_configxfrints(priv, 0);
/* Clearing pending interrupt status on all transfer related interrupts */
putreg32(SDHC_XFRDONE_INTS, KINETIS_SDHC_IRQSTAT);
/* If this was a DMA transfer, make sure that DMA is stopped */
#ifdef CONFIG_SDIO_DMA
/* Stop the DMA by resetting the data path*/
regval = getreg32(KINETIS_SDHC_SYSCTL);
regval |= SDHC_SYSCTL_RSTD;
putreg32(regval, KINETIS_SDHC_SYSCTL);
#endif
/* Mark the transfer finished */
priv->remaining = 0;
/* Debug instrumentation */
kinetis_sample(priv, SAMPLENDX_END_TRANSFER);
/* Is a thread wait for these data transfer complete events? */
if ((priv->waitevents & wkupevent) != 0)
{
/* Yes.. wake up any waiting threads */
kinetis_endwait(priv, wkupevent);
}
}
/****************************************************************************
* Interrupt Handling
****************************************************************************/
/****************************************************************************
* Name: kinetis_interrupt
*
* Description:
* SDIO interrupt handler
*
* Input Parameters:
* dev - An instance of the SDIO device interface
*
* Returned Value:
* None
*
****************************************************************************/
static int kinetis_interrupt(int irq, void *context)
{
struct kinetis_dev_s *priv = &g_sdhcdev;
uint32_t enabled;
uint32_t pending;
uint32_t regval;
/* Check the SDHC IRQSTAT 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 IRQSTAT and IRQSIGEN registers). If
* there are non-zero bits remaining, then we have work to do here.
*/
regval = getreg32(KINETIS_SDHC_IRQSIGEN);
enabled = getreg32(KINETIS_SDHC_IRQSTAT) & regval;
fllvdbg("IRQSTAT: %08x IRQSIGEN %08x enabled: %08x\n",
getreg32(KINETIS_SDHC_IRQSTAT), regval, enabled);
/* Disable card interrupts to clear the card interrupt to the host system. */
regval &= ~SDHC_INT_CINT;
putreg32(regval, KINETIS_SDHC_IRQSIGEN);
/* Clear all pending interrupts */
putreg32(enabled, KINETIS_SDHC_IRQSTAT);
/* Handle in progress, interrupt driven data transfers ********************/
pending = enabled & priv->xfrints;
if (pending != 0)
{
#ifndef CONFIG_SDIO_DMA
/* Is the RX buffer read ready? Is so then we must be processing a
* non-DMA receive transaction.
*/
if ((pending & SDHC_INT_BRR) != 0)
{
/* Receive data from the RX buffer */
kinetis_receive(priv);
}
/* Otherwise, Is the TX buffer write ready? If so we must
* be processing a non-DMA send transaction. NOTE: We can't be
* processing both!
*/
else if ((pending & SDHC_INT_BWR) != 0)
{
/* Send data via the TX FIFO */
kinetis_transmit(priv);
}
#endif
/* Handle transfer complete events */
if ((pending & SDHC_INT_TC) != 0)
{
/* Terminate the transfer */
kinetis_endtransfer(priv, SDIOWAIT_TRANSFERDONE);
}
/* Handle data block send/receive CRC failure */
else if ((pending & SDHC_INT_DCE) != 0)
{
/* Terminate the transfer with an error */
flldbg("ERROR: Data block CRC failure, remaining: %d\n", priv->remaining);
kinetis_endtransfer(priv, SDIOWAIT_TRANSFERDONE|SDIOWAIT_ERROR);
}
/* Handle data timeout error */
else if ((pending & SDHC_INT_DTOE) != 0)
{
/* Terminate the transfer with an error */
flldbg("ERROR: Data timeout, remaining: %d\n", priv->remaining);
kinetis_endtransfer(priv, SDIOWAIT_TRANSFERDONE|SDIOWAIT_TIMEOUT);
}
}
/* Handle wait events *****************************************************/
pending = enabled & priv->waitints;
if (pending != 0)
{
/* Is this a response completion event? */
if ((pending & SDHC_RESPDONE_INTS) != 0)
{
/* Yes.. Is their a thread waiting for response done? */
if ((priv->waitevents & (SDIOWAIT_CMDDONE|SDIOWAIT_RESPONSEDONE)) != 0)
{
/* Yes.. mask further interrupts and wake the thread up */
regval = getreg32(KINETIS_SDHC_IRQSIGEN);
regval &= ~SDHC_RESPDONE_INTS;
putreg32(regval, KINETIS_SDHC_IRQSIGEN);
kinetis_endwait(priv, SDIOWAIT_RESPONSEDONE);
}
}
}
/* Re-enable card interrupts */
regval = getreg32(KINETIS_SDHC_IRQSIGEN);
regval |= SDHC_INT_CINT;
putreg32(regval, KINETIS_SDHC_IRQSIGEN);
return OK;
}
/****************************************************************************
* SDIO Interface Methods
****************************************************************************/
/****************************************************************************
* Name: kinetis_lock
*
* Description:
* Locks the bus. Function calls low-level multiplexed bus routines to
* resolve bus requests and acknowledgement issues.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* lock - TRUE to lock, FALSE to unlock.
*
* Returned Value:
* OK on success; a negated errno on failure
*
****************************************************************************/
#ifdef CONFIG_SDIO_MUXBUS
static int kinetis_lock(FAR struct sdio_dev_s *dev, bool lock)
{
/* Single SDIO instance so there is only one possibility. The multiplex
* bus is part of board support package.
*/
kinetis_muxbus_sdio_lock(lock);
return OK;
}
#endif
/****************************************************************************
* Name: kinetis_reset
*
* Description:
* Reset the SDIO controller. Undo all setup and initialization.
*
* Input Parameters:
* dev - An instance of the SDIO device interface
*
* Returned Value:
* None
*
****************************************************************************/
static void kinetis_reset(FAR struct sdio_dev_s *dev)
{
FAR struct kinetis_dev_s *priv = (FAR struct kinetis_dev_s *)dev;
uint32_t regval;
/* Disable all interrupts so that nothing interferes with the following. */
putreg32(0, KINETIS_SDHC_IRQSIGEN);
/* Reset the SDHC block, putting registers in their default, reset state.
* Initiate the reset by setting the RSTA bit in the SYSCTL register.
*/
regval = getreg32(KINETIS_SDHC_SYSCTL);
regval |= SDHC_SYSCTL_RSTA;
putreg32(regval, KINETIS_SDHC_SYSCTL);
/* The SDHC will reset the RSTA bit to 0 when the capabilities
* registers are valid and the host driver can read them.
*/
while ((getreg32(KINETIS_SDHC_SYSCTL) & SDHC_SYSCTL_RSTA) != 0);
/* Make sure that all clocking is disabled */
kinetis_clock(dev, CLOCK_SDIO_DISABLED);
/* Enable all status bits (these could not all be potential sources of
* interrupts.
*/
putreg32(SDHC_INT_ALL, KINETIS_SDHC_IRQSTATEN);
fvdbg("SYSCTL: %08x PRSSTAT: %08x IRQSTATEN: %08x\n",
getreg32(KINETIS_SDHC_SYSCTL), getreg32(KINETIS_SDHC_PRSSTAT),
getreg32(KINETIS_SDHC_IRQSTATEN));
/* The next phase of the hardware reset would be to set the SYSCTRL INITA
* bit to send 80 clock ticks for card to power up and then reset the card
* with CMD0. This is done elsewhere.
*/
/* Reset state data */
priv->waitevents = 0; /* Set of events to be waited for */
priv->waitints = 0; /* Interrupt enables for event waiting */
priv->wkupevent = 0; /* The event that caused the wakeup */
#ifdef CONFIG_SDIO_DMA
priv->xfrflags = 0; /* Used to synchronize SDIO and DMA completion events */
#endif
wd_cancel(priv->waitwdog); /* Cancel any timeouts */
/* Interrupt mode data transfer support */
priv->buffer = 0; /* Address of current R/W buffer */
priv->remaining = 0; /* Number of bytes remaining in the transfer */
priv->xfrints = 0; /* Interrupt enables for data transfer */
}
/****************************************************************************
* Name: kinetis_status
*
* Description:
* Get SDIO status.
*
* Input Parameters:
* dev - Device-specific state data
*
* Returned Value:
* Returns a bitset of status values (see kinetis_status_* defines)
*
****************************************************************************/
static uint8_t kinetis_status(FAR struct sdio_dev_s *dev)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s *)dev;
return priv->cdstatus;
}
/****************************************************************************
* Name: kinetis_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 kinetis_widebus(FAR struct sdio_dev_s *dev, bool wide)
{
uint32_t regval;
/* Set the Data Transfer Width (DTW) field in the PROCTL register */
regval = getreg32(KINETIS_SDHC_PROCTL);
regval &= ~SDHC_PROCTL_DTW_MASK;
if (wide)
{
regval |= SDHC_PROCTL_DTW_4BIT;
}
else
{
regval |= SDHC_PROCTL_DTW_1BIT;
}
putreg32(regval, KINETIS_SDHC_PROCTL);
}
/****************************************************************************
* Name: kinetis_frequency
*
* Description:
* Set the SD clock frequency
*
* Input Parameters:
* dev - An instance of the SDIO device interface
* frequency - The frequency to use
*
* Returned Value:
* None
*
****************************************************************************/
#if CONFIG_KINETIS_SDHC_ABSFREQ
static void kinetis_frequency(FAR struct sdio_dev_s *dev, uint32_t frequency)
{
uint32_t sdclkfs;
uint32_t prescaled;
uint32_t regval;
unsigned int prescaler;
unsigned int divisor;
/* The SDCLK frequency is determined by (1) the frequency of the base clock
* that was selected as the input clock, and (2) by a prescaler and a
* divisor that are selected here:
*
* SDCLK frequency = (base clock) / (prescaler * divisor)
*
* The prescaler is avalable only for the values: 2, 4, 8, 16, 32, 64, 128,
* and 256. Pick the smallest value of SDCLKFS that would result in an
* in-range frequency.
*
* For example, if the base clock frequency is 96 MHz, and the target
* frequency is 25 MHz, the following logic will select prescaler.
*
* 96MHz / 2 <= 25MHz <= 96MHz / 2 /16 -- YES, prescaler == 2
*
* If the target frequency is 400 kHz, the following logic will select
* prescaler:
*
* 96MHz / 2 <= 400KHz <= 96MHz / 2 / 16 -- NO
* 96MHz / 4 <= 400KHz <= 96MHz / 4 / 16 -- NO
* 96MHz / 8 <= 400KHz <= 96MHz / 8 / 16 -- NO
* 96MHz / 16 <= 400KHz <= 96MHz / 16 / 16 -- YES, prescaler == 16
*/
if (/*frequency >= (BOARD_CORECLK_FREQ / 2) && */
frequency <= (BOARD_CORECLK_FREQ / 2 / 16))
{
sdclkfs = SDHC_SYSCTL_SDCLKFS_DIV2;
prescaler = 2;
}
else if (frequency >= (BOARD_CORECLK_FREQ / 4) &&
frequency <= (BOARD_CORECLK_FREQ / 4 / 16))
{
sdclkfs = SDHC_SYSCTL_SDCLKFS_DIV4;
prescaler = 4;
}
else if (frequency >= (BOARD_CORECLK_FREQ / 8) &&
frequency <= (BOARD_CORECLK_FREQ / 8 / 16))
{
sdclkfs = SDHC_SYSCTL_SDCLKFS_DIV8;
prescaler = 8;
}
else if (frequency >= (BOARD_CORECLK_FREQ / 16) &&
frequency <= (BOARD_CORECLK_FREQ / 16 / 16))
{
sdclkfs = SDHC_SYSCTL_SDCLKFS_DIV16;
prescaler = 16;
}
else if (frequency >= (BOARD_CORECLK_FREQ / 32) &&
frequency <= (BOARD_CORECLK_FREQ / 32 / 16))
{
sdclkfs = SDHC_SYSCTL_SDCLKFS_DIV32;
prescaler = 32;
}
else if (frequency >= (BOARD_CORECLK_FREQ / 64) &&
frequency <= (BOARD_CORECLK_FREQ / 64 / 16))
{
sdclkfs = SDHC_SYSCTL_SDCLKFS_DIV64;
prescaler = 64;
}
else if (frequency >= (BOARD_CORECLK_FREQ / 128) &&
frequency <= (BOARD_CORECLK_FREQ / 128 / 16))
{
sdclkfs = SDHC_SYSCTL_SDCLKFS_DIV128;
prescaler = 128;
}
else /* if (frequency >= (BOARD_CORECLK_FREQ / 256) &&
frequency <= (BOARD_CORECLK_FREQ / 256 / 16)) */
{
sdclkfs = SDHC_SYSCTL_SDCLKFS_DIV256;
prescaler = 256;
}
/* The optimal divider can than be calculated.
*
* For example, if the base clock frequency is 96 MHz, the target
* frequency is 25 MHz, and the selected prescaler value is 2, then
*
* prescaled = 96MHz / 2 = 48MHz
* divisor = (48MHz + 12.5HMz/ 25MHz = 2
*
* And the resulting frequency will be 24MHz.
*
* Or, for example, if the target frequency is 400 kHz and the selected
* prescaler is 16, the following* logic will select prescaler:
*
* prescaled = 96MHz / 16 = 6MHz
* divisor = (6MHz + 200KHz) / 400KHz = 15
*
* And the restuling frequency will be exactly 400KHz.
*/
prescaled = frequency / prescaler;
divisor = (prescaled + (frequency >> 1)) / frequency;
/* Set the new divisor information and enable all clocks in the SYSCTRL
* register.
*
* TODO: Investigate using the automatically gated clocks to reduce power
* consumption.
*/
regval = getreg32(KINETIS_SDHC_SYSCTL);
regval &= ~(SDHC_SYSCTL_SDCLKFS_MASK|SDHC_SYSCTL_DVS_MASK);
regval |= (sdclkfs | SDHC_SYSCTL_DVS_DIV(divisor));
regval |= (SDHC_SYSCTL_SDCLKEN|SDHC_SYSCTL_PEREN|SDHC_SYSCTL_HCKEN|
SDHC_SYSCTL_IPGEN);
putreg32(regval, KINETIS_SDHC_SYSCTL);
fvdbg("SYSCTRL: %08x\n", getreg32(KINETIS_SDHC_SYSCTL));
}
#endif
/****************************************************************************
* Name: kinetis_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
*
****************************************************************************/
#if CONFIG_KINETIS_SDHC_ABSFREQ
static void kinetis_clock(FAR struct sdio_dev_s *dev, enum sdio_clock_e rate)
{
uint32_t frequency;
uint32_t regval;
/* The SDCLK must be disabled before its frequency can be changed: "SDCLK
* frequency can be changed when this bit is 0. Then, the host controller
* shall maintain the same clock frequency until SDCLK is stopped (stop at
* SDCLK = 0).
*/
regval = getreg32(KINETIS_SDHC_SYSCTL);
regval &= ~SDHC_SYSCTL_SDCLKEN;
putreg32(regval, KINETIS_SDHC_SYSCTL);
fvdbg("SYSCTRL: %08x\n", getreg32(KINETIS_SDHC_SYSCTL));
switch (rate)
{
default:
case CLOCK_SDIO_DISABLED : /* Clock is disabled */
{
/* Clear the prescaler and divisor settings and other clock
* enables as well.
*/
regval &= ~(SDHC_SYSCTL_IPGEN|SDHC_SYSCTL_HCKEN|SDHC_SYSCTL_PEREN|
SDHC_SYSCTL_SDCLKFS_MASK|SDHC_SYSCTL_DVS_MASK);
putreg32(regval, KINETIS_SDHC_SYSCTL);
fvdbg("SYSCTRL: %08x\n", getreg32(KINETIS_SDHC_SYSCTL));
return;
}
case CLOCK_IDMODE : /* Initial ID mode clocking (<400KHz) */
frequency = CONFIG_KINETIS_IDMODE_FREQ;
break;
case CLOCK_MMC_TRANSFER : /* MMC normal operation clocking */
frequency = CONFIG_KINETIS_MMCXFR_FREQ;
break;
case CLOCK_SD_TRANSFER_1BIT : /* SD normal operation clocking (narrow 1-bit mode) */
#ifndef CONFIG_SDIO_WIDTH_D1_ONLY
frequency = CONFIG_KINETIS_SD1BIT_FREQ;
break;
#endif
case CLOCK_SD_TRANSFER_4BIT : /* SD normal operation clocking (wide 4-bit mode) */
frequency = CONFIG_KINETIS_SD4BIT_FREQ;
break;
}
/* Then set the selected frequency */
kinetis_frequency(dev, frequency);
}
#else
static void kinetis_clock(FAR struct sdio_dev_s *dev, enum sdio_clock_e rate)
{
uint32_t regval;
/* The SDCLK must be disabled before its frequency can be changed: "SDCLK
* frequency can be changed when this bit is 0. Then, the host controller
* shall maintain the same clock frequency until SDCLK is stopped (stop at
* SDCLK = 0).
*/
regval = getreg32(KINETIS_SDHC_SYSCTL);
regval &= ~SDHC_SYSCTL_SDCLKEN;
putreg32(regval, KINETIS_SDHC_SYSCTL);
fvdbg("SYSCTRL: %08x\n", getreg32(KINETIS_SDHC_SYSCTL));
/* Clear the old prescaler and divisor values so that new ones can be ORed
* in.
*/
regval &= ~(SDHC_SYSCTL_SDCLKFS_MASK|SDHC_SYSCTL_DVS_MASK);
/* Select the new prescaler and divisor values based on the requested mode
* and the settings from the board.h file.
*
* TODO: Investigate using the automatically gated clocks to reduce power
* consumption.
*/
switch (rate)
{
default:
case CLOCK_SDIO_DISABLED : /* Clock is disabled */
{
/* Clear the prescaler and divisor settings and other clock
* enables as well.
*/
regval &= ~(SDHC_SYSCTL_IPGEN|SDHC_SYSCTL_HCKEN|SDHC_SYSCTL_PEREN);
putreg32(regval, KINETIS_SDHC_SYSCTL);
fvdbg("SYSCTRL: %08x\n", getreg32(KINETIS_SDHC_SYSCTL));
return;
}
case CLOCK_IDMODE : /* Initial ID mode clocking (<400KHz) */
regval |= (BOARD_SDHC_IDMODE_PRESCALER|BOARD_SDHC_IDMODE_DIVISOR|
SDHC_SYSCTL_SDCLKEN|SDHC_SYSCTL_PEREN|SDHC_SYSCTL_HCKEN|
SDHC_SYSCTL_IPGEN);
break;
case CLOCK_MMC_TRANSFER : /* MMC normal operation clocking */
regval |= (BOARD_SDHC_MMCMODE_PRESCALER|BOARD_SDHC_MMCMODE_DIVISOR|
SDHC_SYSCTL_SDCLKEN|SDHC_SYSCTL_PEREN|SDHC_SYSCTL_HCKEN|
SDHC_SYSCTL_IPGEN);
break;
case CLOCK_SD_TRANSFER_1BIT : /* SD normal operation clocking (narrow
* 1-bit mode) */
#ifndef CONFIG_SDIO_WIDTH_D1_ONLY
regval |= (BOARD_SDHC_SD1MODE_PRESCALER|BOARD_SDHC_IDMODE_DIVISOR|
SDHC_SYSCTL_SDCLKEN|SDHC_SYSCTL_PEREN|SDHC_SYSCTL_HCKEN|
SDHC_SYSCTL_IPGEN);
break;
#endif
case CLOCK_SD_TRANSFER_4BIT : /* SD normal operation clocking (wide
* 4-bit mode) */
regval |= (BOARD_SDHC_SD4MODE_PRESCALER|BOARD_SDHC_SD4MODE_DIVISOR|
SDHC_SYSCTL_SDCLKEN|SDHC_SYSCTL_PEREN|SDHC_SYSCTL_HCKEN|
SDHC_SYSCTL_IPGEN);
break;
}
putreg32(regval, KINETIS_SDHC_SYSCTL);
fvdbg("SYSCTRL: %08x\n", getreg32(KINETIS_SDHC_SYSCTL));
}
#endif
/****************************************************************************
* Name: kinetis_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 kinetis_attach(FAR struct sdio_dev_s *dev)
{
int ret;
/* Attach the SDIO interrupt handler */
ret = irq_attach(KINETIS_IRQ_SDHC, kinetis_interrupt);
if (ret == OK)
{
/* Disable all interrupts at the SDIO controller and clear all pending
* interrupts.
*/
putreg32(0, KINETIS_SDHC_IRQSIGEN);
putreg32(SDHC_INT_ALL, KINETIS_SDHC_IRQSTAT);
#ifdef CONFIG_ARCH_IRQPRIO
/* Set the interrupt priority */
up_prioritize_irq(KINETIS_IRQ_SDHC, CONFIG_KINETIS_SDHC_PRIO);
#endif
/* Enable SDIO interrupts at the NVIC. They can now be enabled at
* the SDIO controller as needed.
*/
up_enable_irq(KINETIS_IRQ_SDHC);
}
return ret;
}
/****************************************************************************
* Name: kinetis_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 kinetis_sendcmd(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t arg)
{
uint32_t regval;
uint32_t cmdidx;
int32_t timeout;
/* Initialize the command index */
cmdidx = (cmd & MMCSD_CMDIDX_MASK) >> MMCSD_CMDIDX_SHIFT;
regval = cmdidx << SDHC_XFERTYP_CMDINX_SHIFT;
/* Does a data transfer accompany the command? */
if ((cmd & MMCSD_DATAXFR) != 0)
{
/* Yes.. Configure the data transfer */
switch (cmd & MMCSD_DATAXFR_MASK)
{
default:
case MMCSD_NODATAXFR : /* No.. no data transfer */
break;
/* The following two cases are probably missing some setup logic */
case MMCSD_RDSTREAM : /* Yes.. streaming read data transfer */
regval |= (SDHC_XFERTYP_DPSEL | SDHC_XFERTYP_DTDSEL);
break;
case MMCSD_WRSTREAM : /* Yes.. streaming write data transfer */
regval |= SDHC_XFERTYP_DPSEL;
break;
case MMCSD_RDDATAXFR : /* Yes.. normal read data transfer */
regval |= (SDHC_XFERTYP_DPSEL | SDHC_XFERTYP_DTDSEL);
break;
case MMCSD_WRDATAXFR : /* Yes.. normal write data transfer */
regval |= SDHC_XFERTYP_DPSEL;
break;
}
/* Is it a multi-block transfer? */
if ((cmd & MMCSD_MULTIBLOCK) != 0)
{
/* Yes.. should the transfer be stopped with ACMD12? */
if ((cmd & MMCSD_STOPXFR) != 0)
{
/* Yes.. Indefinite block transfer */
regval |= (SDHC_XFERTYP_MSBSEL | SDHC_XFERTYP_AC12EN);
}
else
{
/* No.. Fixed block transfer */
regval |= (SDHC_XFERTYP_MSBSEL | SDHC_XFERTYP_BCEN);
}
}
}
/* Configure response type bits */
switch (cmd & MMCSD_RESPONSE_MASK)
{
case MMCSD_NO_RESPONSE: /* No response */
regval |= SDHC_XFERTYP_RSPTYP_NONE;
break;
case MMCSD_R1B_RESPONSE: /* Response length 48, check busy & cmdindex*/
regval |= (SDHC_XFERTYP_RSPTYP_LEN48BSY|SDHC_XFERTYP_CICEN|SDHC_XFERTYP_CCCEN);
break;
case MMCSD_R1_RESPONSE: /* Response length 48, check cmdindex */
case MMCSD_R5_RESPONSE:
case MMCSD_R6_RESPONSE:
regval |= (SDHC_XFERTYP_RSPTYP_LEN48|SDHC_XFERTYP_CICEN|SDHC_XFERTYP_CCCEN);
break;
case MMCSD_R2_RESPONSE: /* Response length 136, check CRC */
regval |= (SDHC_XFERTYP_RSPTYP_LEN136|SDHC_XFERTYP_CCCEN);
break;
case MMCSD_R3_RESPONSE: /* Response length 48 */
case MMCSD_R4_RESPONSE:
case MMCSD_R7_RESPONSE:
regval |= SDHC_XFERTYP_RSPTYP_LEN48;
break;
}
/* Enable DMA */
#ifdef CONFIG_SDIO_DMA
/* Internal DMA is used */
regval |= SDHC_XFERTYP_DMAEN;
#endif
/* Other bits? What about CMDTYP? */
fvdbg("cmd: %08x arg: %08x regval: %08x\n", cmd, arg, regval);
/* The Command Inhibit (CIHB) bit is set in the PRSSTAT bit immediately
* after the transfer type register is written. This bit is cleared when
* the command response is received. If this status bit is 0, it
* indicates that the CMD line is not in use and the SDHC can issue a
* SD/MMC Command using the CMD line.
*
* CIHB should always be set when this function is called.
*/
timeout = SDHC_CMDTIMEOUT;
while ((getreg32(KINETIS_SDHC_PRSSTAT) & SDHC_PRSSTAT_CIHB) != 0)
{
if (--timeout <= 0)
{
fdbg("ERROR: Timeout cmd: %08x PRSSTAT: %08x\n",
cmd, getreg32(KINETIS_SDHC_PRSSTAT));
return -EBUSY;
}
}
/* Set the SDHC Argument value */
putreg32(arg, KINETIS_SDHC_CMDARG);
/* Clear interrupt status and write the SDHC CMD */
putreg32(SDHC_RESPDONE_INTS, KINETIS_SDHC_IRQSTAT);
putreg32(regval, KINETIS_SDHC_XFERTYP);
return OK;
}
/****************************************************************************
* Name: kinetis_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
* nbytes - The number of bytes in the transfer
*
* Returned Value:
* Number of bytes sent on success; a negated errno on failure
*
****************************************************************************/
#ifndef CONFIG_SDIO_DMA
static int kinetis_recvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer,
size_t nbytes)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s *)dev;
DEBUGASSERT(priv != NULL && buffer != NULL && nbytes > 0);
DEBUGASSERT(((uint32_t)buffer & 3) == 0);
/* Reset the DPSM configuration */
kinetis_datadisable();
kinetis_sampleinit();
kinetis_sample(priv, SAMPLENDX_BEFORE_SETUP);
/* Save the destination buffer information for use by the interrupt handler */
priv->buffer = (uint32_t*)buffer;
priv->remaining = nbytes;
/* Then set up the SDIO data path */
kinetis_dataconfig(priv, false, nbytes, 1, SDHC_DVS_DATATIMEOUT);
/* And enable interrupts */
kinetis_configxfrints(priv, SDHC_RCVDONE_INTS);
kinetis_sample(priv, SAMPLENDX_AFTER_SETUP);
return OK;
}
#endif
/****************************************************************************
* Name: kinetis_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
* nbytes - The number of bytes in the transfer
*
* Returned Value:
* Number of bytes sent on success; a negated errno on failure
*
****************************************************************************/
#ifndef CONFIG_SDIO_DMA
static int kinetis_sendsetup(FAR struct sdio_dev_s *dev, FAR const uint8_t *buffer,
size_t nbytes)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s *)dev;
DEBUGASSERT(priv != NULL && buffer != NULL && nbytes > 0);
DEBUGASSERT(((uint32_t)buffer & 3) == 0);
/* Reset the DPSM configuration */
kinetis_datadisable();
kinetis_sampleinit();
kinetis_sample(priv, SAMPLENDX_BEFORE_SETUP);
/* Save the source buffer information for use by the interrupt handler */
priv->buffer = (uint32_t*)buffer;
priv->remaining = nbytes;
/* Then set up the SDIO data path */
kinetis_dataconfig(priv, true, nbytes, 1, SDHC_DVS_DATATIMEOUT);
/* Enable TX interrrupts */
kinetis_configxfrints(priv, SDHC_SNDDONE_INTS);
kinetis_sample(priv, SAMPLENDX_AFTER_SETUP);
return OK;
}
#endif
/****************************************************************************
* Name: kinetis_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 kinetis_cancel(FAR struct sdio_dev_s *dev)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s*)dev;
#ifdef CONFIG_SDIO_DMA
uint32_t regval;
#endif
/* Disable all transfer- and event- related interrupts */
kinetis_configxfrints(priv, 0);
kinetis_configwaitints(priv, 0, 0, 0);
/* Clearing pending interrupt status on all transfer- and event- related
* interrupts
*/
putreg32(SDHC_WAITALL_INTS, KINETIS_SDHC_IRQSTAT);
/* Cancel any watchdog timeout */
(void)wd_cancel(priv->waitwdog);
/* If this was a DMA transfer, make sure that DMA is stopped */
#ifdef CONFIG_SDIO_DMA
/* Stop the DMA by resetting the data path*/
regval = getreg32(KINETIS_SDHC_SYSCTL);
regval |= SDHC_SYSCTL_RSTD;
putreg32(regval, KINETIS_SDHC_SYSCTL);
#endif
/* Mark no transfer in progress */
priv->remaining = 0;
return OK;
}
/****************************************************************************
* Name: kinetis_waitresponse
*
* Description:
* Poll-wait for the response to the last command to be ready. This
* function should be called even after sending commands that have no
* response (such as CMD0) to make sure that the hardware is ready to
* receive the next command.
*
* 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 kinetis_waitresponse(FAR struct sdio_dev_s *dev, uint32_t cmd)
{
uint32_t errors;
int32_t timeout;
int ret = OK;
switch (cmd & MMCSD_RESPONSE_MASK)
{
case MMCSD_NO_RESPONSE:
timeout = SDHC_CMDTIMEOUT;
errors = 0;
return OK;
case MMCSD_R1_RESPONSE:
case MMCSD_R1B_RESPONSE:
case MMCSD_R2_RESPONSE:
case MMCSD_R6_RESPONSE:
timeout = SDHC_LONGTIMEOUT;
errors = SDHC_RESPERR_INTS;
break;
case MMCSD_R4_RESPONSE:
case MMCSD_R5_RESPONSE:
return -ENOSYS;
case MMCSD_R3_RESPONSE:
case MMCSD_R7_RESPONSE:
timeout = SDHC_CMDTIMEOUT;
errors = SDHC_RESPERR_INTS;
break;
default:
return -EINVAL;
}
/* Then wait for the Command Complete (CC) indication (or timeout). The
* CC bit is set when the end bit of the command response is received
* (except Auto CMD12).
*/
while ((getreg32(KINETIS_SDHC_IRQSTAT) & SDHC_INT_CC) == 0)
{
if (--timeout <= 0)
{
fdbg("ERROR: Timeout cmd: %08x IRQSTAT: %08x\n",
cmd, getreg32(KINETIS_SDHC_IRQSTAT));
return -ETIMEDOUT;
}
}
/* Check for hardware detected errors */
if ((getreg32(KINETIS_SDHC_IRQSTAT) & errors) != 0)
{
fdbg("ERROR: cmd: %08x errors: %08x IRQSTAT: %08x\n",
cmd, errors, getreg32(KINETIS_SDHC_IRQSTAT));
ret = -EIO;
}
/* Clear the response wait status bits */
putreg32(SDHC_RESPDONE_INTS, KINETIS_SDHC_IRQSTAT);
return ret;
}
/****************************************************************************
* Name: kinetis_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 faiure to obtain the requested reponse (due to
* transport problem -- timeout, CRC, etc.). The implementation only
* assures that the response is returned intacta and does not check errors
* within the response itself.
*
****************************************************************************/
static int kinetis_recvshortcrc(FAR struct sdio_dev_s *dev, uint32_t cmd,
uint32_t *rshort)
{
uint32_t regval;
int ret = OK;
/* 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 signalling 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
*/
#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)
{
fdbg("ERROR: Wrong response CMD=%08x\n", cmd);
ret = -EINVAL;
}
else
#endif
{
/* Check if a timeout or CRC error occurred */
regval = getreg32(KINETIS_SDHC_IRQSTAT);
if ((regval & SDHC_INT_CTOE) != 0)
{
fdbg("ERROR: Command timeout: %08x\n", regval);
ret = -ETIMEDOUT;
}
else if ((regval & SDHC_INT_CCE) != 0)
{
fdbg("ERROR: CRC failure: %08x\n", regval);
ret = -EIO;
}
}
/* Return the R1/R1b/R6 response. These responses are returned in
* CDMRSP0. NOTE: This is not true for R1b (Auto CMD12 response) which
* is returned in CMDRSP3.
*/
*rshort = getreg32(KINETIS_SDHC_CMDRSP0);
return ret;
}
static int kinetis_recvlong(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t rlong[4])
{
uint32_t regval;
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 if a timeout or CRC error occurred */
regval = getreg32(KINETIS_SDHC_IRQSTAT);
if (regval & SDHC_INT_CTOE)
{
fdbg("ERROR: Timeout IRQSTAT: %08x\n", regval);
ret = -ETIMEDOUT;
}
else if (regval & SDHC_INT_CCE)
{
fdbg("ERROR: CRC fail IRQSTAT: %08x\n", regval);
ret = -EIO;
}
}
/* Return the long response in CMDRSP3..0*/
if (rlong)
{
rlong[0] = getreg32(KINETIS_SDHC_CMDRSP3);
rlong[1] = getreg32(KINETIS_SDHC_CMDRSP2);
rlong[2] = getreg32(KINETIS_SDHC_CMDRSP1);
rlong[3] = getreg32(KINETIS_SDHC_CMDRSP0);
}
return ret;
}
static int kinetis_recvshort(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t *rshort)
{
uint32_t regval;
int ret = OK;
/* 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
*/
/* Check that this is the correct response to this command */
#ifdef CONFIG_DEBUG
if ((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 if a timeout occurred (Apparently a CRC error can terminate
* a good response)
*/
regval = getreg32(KINETIS_SDHC_IRQSTAT);
if (regval & SDHC_INT_CTOE)
{
fdbg("ERROR: Timeout IRQSTAT: %08x\n", regval);
ret = -ETIMEDOUT;
}
}
/* Return the short response in CMDRSP0 */
if (rshort)
{
*rshort = getreg32(KINETIS_SDHC_CMDRSP0);
}
return ret;
}
/* MMC responses not supported */
static int kinetis_recvnotimpl(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t *rnotimpl)
{
/* Just return an error */
return -ENOSYS;
}
/****************************************************************************
* Name: kinetis_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 kinetis_eventwait. This is done in this way
* to help the driver to eliminate race conditions between the command
* 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 kinetis_waitenable(FAR struct sdio_dev_s *dev,
sdio_eventset_t eventset)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s*)dev;
uint32_t waitints;
DEBUGASSERT(priv != NULL);
/* Disable event-related interrupts */
kinetis_configwaitints(priv, 0, 0, 0);
/* Select the interrupt mask that will give us the appropriate wakeup
* interrupts.
*/
waitints = 0;
if ((eventset & (SDIOWAIT_CMDDONE|SDIOWAIT_RESPONSEDONE)) != 0)
{
waitints |= SDHC_RESPDONE_INTS;
}
if ((eventset & SDIOWAIT_TRANSFERDONE) != 0)
{
waitints |= SDHC_XFRDONE_INTS;
}
/* Enable event-related interrupts */
kinetis_configwaitints(priv, waitints, eventset, 0);
}
/****************************************************************************
* Name: kinetis_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 kinetis_eventwait
* returns. SDIO_WAITEVENTS must be called again before kinetis_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 kinetis_eventwait(FAR struct sdio_dev_s *dev,
uint32_t timeout)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s*)dev;
sdio_eventset_t wkupevent = 0;
int ret;
/* There is a race condition here... the event may have completed before
* we get here. In this case waitevents will be zero, but wkupevents will
* be non-zero (and, hopefully, the semaphore count will also be non-zero.
*/
DEBUGASSERT((priv->waitevents != 0 && priv->wkupevent == 0) ||
(priv->waitevents == 0 && priv->wkupevent != 0));
/* Check if the timeout event is specified in the event set */
if ((priv->waitevents & SDIOWAIT_TIMEOUT) != 0)
{
int delay;
/* Yes.. Handle a corner case */
if (!timeout)
{
return SDIOWAIT_TIMEOUT;
}
/* Start the watchdog timer */
delay = (timeout + (MSEC_PER_TICK-1)) / MSEC_PER_TICK;
ret = wd_start(priv->waitwdog, delay, (wdentry_t)kinetis_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 kinetis_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.
*/
kinetis_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 non-zero value.
*/
if (wkupevent != 0)
{
/* Yes... break out of the loop with wkupevent non-zero */
break;
}
}
/* Disable event-related interrupts */
kinetis_configwaitints(priv, 0, 0, 0);
#ifdef CONFIG_SDIO_DMA
priv->xfrflags = 0;
#endif
kinetis_dumpsamples(priv);
return wkupevent;
}
/****************************************************************************
* Name: kinetis_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 kinetis_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 method.
*
* 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 kinetis_callbackenable(FAR struct sdio_dev_s *dev,
sdio_eventset_t eventset)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s*)dev;
fvdbg("eventset: %02x\n", eventset);
DEBUGASSERT(priv != NULL);
priv->cbevents = eventset;
kinetis_callback(priv);
}
/****************************************************************************
* Name: kinetis_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 function 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 kinetis_registercallback(FAR struct sdio_dev_s *dev,
worker_t callback, void *arg)
{
struct kinetis_dev_s *priv = (struct kinetis_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: kinetis_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 kinetis_dmasupported(FAR struct sdio_dev_s *dev)
{
return true;
}
#endif
/****************************************************************************
* Name: kinetis_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
*
****************************************************************************/
#ifdef CONFIG_SDIO_DMA
static int kinetis_dmarecvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer,
size_t buflen)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s *)dev;
DEBUGASSERT(priv != NULL && buffer != NULL && buflen > 0);
DEBUGASSERT(((uint32_t)buffer & 3) == 0);
/* Reset the DPSM configuration */
kinetis_datadisable();
/* Begin sampling register values */
kinetis_sampleinit();
kinetis_sample(priv, SAMPLENDX_BEFORE_SETUP);
/* Save the destination buffer information for use by the interrupt handler */
priv->buffer = (uint32_t*)buffer;
priv->remaining = buflen;
/* Then set up the SDIO data path */
kinetis_dataconfig(priv, false, buflen, 1, SDHC_DVS_DATATIMEOUT);
/* Configure the RX DMA */
kinetis_configxfrints(priv, SDHC_DMADONE_INTS);
putreg32((uint32_t)buffer, KINETIS_SDHC_DSADDR);
/* Sample the register state */
kinetis_sample(priv, SAMPLENDX_AFTER_SETUP);
return OK;
}
#endif
/****************************************************************************
* Name: kinetis_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
*
****************************************************************************/
#ifdef CONFIG_SDIO_DMA
static int kinetis_dmasendsetup(FAR struct sdio_dev_s *dev,
FAR const uint8_t *buffer, size_t buflen)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s *)dev;
DEBUGASSERT(priv != NULL && buffer != NULL && buflen > 0);
DEBUGASSERT(((uint32_t)buffer & 3) == 0);
/* Reset the DPSM configuration */
kinetis_datadisable();
/* Begin sampling register values */
kinetis_sampleinit();
kinetis_sample(priv, SAMPLENDX_BEFORE_SETUP);
/* Save the source buffer information for use by the interrupt handler */
priv->buffer = (uint32_t*)buffer;
priv->remaining = buflen;
/* Then set up the SDIO data path */
kinetis_dataconfig(priv, true, buflen, 1, SDHC_DVS_DATATIMEOUT);
/* Configure the TX DMA */
putreg32((uint32_t)buffer, KINETIS_SDHC_DSADDR);
/* Sample the register state */
kinetis_sample(priv, SAMPLENDX_AFTER_SETUP);
/* Enable TX interrrupts */
kinetis_configxfrints(priv, SDHC_DMADONE_INTS);
return OK;
}
#endif
/****************************************************************************
* Initialization/uninitialization/reset
****************************************************************************/
/****************************************************************************
* Name: kinetis_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 kinetis_callback(void *arg)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s*)arg;
/* Is a callback registered? */
DEBUGASSERT(priv != NULL);
fvdbg("Callback %p(%p) cbevents: %02x cdstatus: %02x\n",
priv->callback, priv->cbarg, priv->cbevents, priv->cdstatus);
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;
/* Callbacks cannot be performed in the context of an interrupt handler.
* If we are in an interrupt handler, then queue the callback to be
* performed later on the work thread.
*/
if (up_interrupt_context())
{
/* Yes.. queue it */
fvdbg("Queuing callback to %p(%p)\n", priv->callback, priv->cbarg);
(void)work_queue(HPWORK, &priv->cbwork, (worker_t)priv->callback, priv->cbarg, 0);
}
else
{
/* No.. then just call the callback here */
fvdbg("Callback to %p(%p)\n", priv->callback, priv->cbarg);
priv->callback(priv->cbarg);
}
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sdhc_initialize
*
* Description:
* Initialize SDIO 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 *sdhc_initialize(int slotno)
{
uint32_t regval;
/* There is only one slot */
struct kinetis_dev_s *priv = &g_sdhcdev;
DEBUGASSERT(slotno == 0);
/* Initialize the SDHC slot structure data structure */
sem_init(&priv->waitsem, 0, 0);
priv->waitwdog = wd_create();
DEBUGASSERT(priv->waitwdog);
/* Enable clocking to the SDHC module. Clocking is still diabled in
* the SYSCTRL register.
*/
regval = getreg32(KINETIS_SIM_SCGC3);
regval |= SIM_SCGC3_SDHC;
putreg32(regval, KINETIS_SIM_SCGC3);
fvdbg("SIM_SCGC3: %08x\n", regval);
/* In addition to the system clock, the SDHC module needs a clock for the
* base for the external card clock. There are four possible sources for
* this clock, selected by the SIM's SOPT2 register:
*
* - Core/system clock
* - MCGPLLCLK/MCGFLLCLK clock
* - OSCERCLK EXTAL clock
* - External bypass clock from off-chip (SCHC0_CLKINB)
*/
regval = getreg32(KINETIS_SIM_SOPT2);
regval &= ~SIM_SOPT2_SDHCSRC_MASK;
regval |= SIM_SOPT2_SDHCSRC_CORE;
putreg32(regval, KINETIS_SIM_SOPT2);
fvdbg("SIM_SOPT2: %08x\n", regval);
/* Configure pins for 1 or 4-bit, wide-bus operation (the chip is capable
* of 8-bit wide bus operation but D4-D7 are not configured).
*
* If bus is multiplexed then there is a custom bus configuration utility
* in the scope of the board support package.
*/
#ifndef CONFIG_SDIO_MUXBUS
/* Data width 1, 4 or 8 */
kinetis_pinconfig(PIN_SDHC0_D0);
/* Data width 4 or 8 */
#ifndef CONFIG_SDIO_WIDTH_D1_ONLY
kinetis_pinconfig(PIN_SDHC0_D1);
kinetis_pinconfig(PIN_SDHC0_D2);
kinetis_pinconfig(PIN_SDHC0_D3);
/* Data width 8 (not supported) */
#if 0
kinetis_pinconfig(PIN_SDHC0_D4);
kinetis_pinconfig(PIN_SDHC0_D5);
kinetis_pinconfig(PIN_SDHC0_D6);
kinetis_pinconfig(PIN_SDHC0_D7);
#endif
#endif
/* Clocking and CMD pins (all data widths) */
kinetis_pinconfig(PIN_SDHC0_DCLK);
kinetis_pinconfig(PIN_SDHC0_CMD);
#endif
/* Reset the card and assure that it is in the initial, unconfigured
* state.
*/
kinetis_reset(&priv->dev);
kinetis_showregs(priv, "After reset");
return &g_sdhcdev.dev;
}
/****************************************************************************
* Name: sdhc_mediachange
*
* Description:
* Called by board-specific logic -- possible 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
*
****************************************************************************/
void sdhc_mediachange(FAR struct sdio_dev_s *dev, bool cardinslot)
{
struct kinetis_dev_s *priv = (struct kinetis_dev_s *)dev;
uint8_t cdstatus;
irqstate_t flags;
/* Update card status */
flags = irqsave();
cdstatus = priv->cdstatus;
if (cardinslot)
{
priv->cdstatus |= SDIO_STATUS_PRESENT;
}
else
{
priv->cdstatus &= ~SDIO_STATUS_PRESENT;
}
fvdbg("cdstatus OLD: %02x NEW: %02x\n", cdstatus, priv->cdstatus);
/* Perform any requested callback if the status has changed */
if (cdstatus != priv->cdstatus)
{
kinetis_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 writeprotected.
*
* Returned Values:
* None
*
****************************************************************************/
void sdhc_wrprotect(FAR struct sdio_dev_s *dev, bool wrprotect)
{
struct kinetis_dev_s *priv = (struct kinetis_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_KINETIS_SDHC */
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