/**************************************************************************** * arch/arm/src/stm32/stm32_sdio.c * * Copyright (C) 2009, 2011-2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "chip.h" #include "up_arch.h" #include "stm32_internal.h" #include "stm32_dma.h" #include "stm32_sdio.h" #if CONFIG_STM32_SDIO /**************************************************************************** * Pre-Processor Definitions ****************************************************************************/ /* Configuration ************************************************************/ /* Required system configuration options: * * CONFIG_ARCH_DMA - Enable architecture-specific DMA subsystem * initialization. Required if CONFIG_SDIO_DMA is enabled. * CONFIG_STM32_DMA2 - Enable STM32 DMA2 support. Required if * CONFIG_SDIO_DMA is enabled * CONFIG_SCHED_WORKQUEUE -- Callback support requires work queue support. * * Driver-specific configuration options: * * CONFIG_SDIO_MUXBUS - Setting this configuration enables some locking * APIs to manage concurrent accesses on the SDIO bus. This is not * needed for the simple case of a single SD card, for example. * CONFIG_SDIO_DMA - Enable SDIO. This is a marginally optional. For * most usages, SDIO will cause data overruns if used without DMA. * NOTE the above system DMA configuration options. * CONFIG_SDIO_WIDTH_D1_ONLY - This may be selected to force the driver * operate with only a single data line (the default is to use all * 4 SD data lines). * CONFIG_SDIO_PRI - SDIO interrupt priority. This setting is not very * important since interrupt nesting is not currently supported. * CONFIG_SDM_DMAPRIO - SDIO DMA priority. This can be selecte if * CONFIG_SDIO_DMA is enabled. * CONFIG_SDIO_XFRDEBUG - Enables some very low-level debug output * This also requires CONFIG_DEBUG_FS and CONFIG_DEBUG_VERBOSE */ #if defined(CONFIG_SDIO_DMA) && !defined(CONFIG_STM32_DMA2) # warning "CONFIG_SDIO_DMA support requires CONFIG_STM32_DMA2" #endif #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_SDIO_PRI # define CONFIG_SDIO_PRI NVIC_SYSH_PRIORITY_DEFAULT #endif #ifdef CONFIG_SDIO_DMA # ifndef CONFIG_SDIO_DMAPRIO # if defined(CONFIG_STM32_STM32F10XX) # define CONFIG_SDIO_DMAPRIO DMA_CCR_PRIMED # elif defined(CONFIG_STM32_STM32F20XX) || defined(CONFIG_STM32_STM32F40XX) # define CONFIG_SDIO_DMAPRIO DMA_SCR_PRIVERYHI # else # error "Unknown STM32 DMA" # endif # endif # if defined(CONFIG_STM32_STM32F10XX) # if (CONFIG_SDIO_DMAPRIO & ~DMA_CCR_PL_MASK) != 0 # error "Illegal value for CONFIG_SDIO_DMAPRIO" # endif # elif defined(CONFIG_STM32_STM32F20XX) || defined(CONFIG_STM32_STM32F40XX) # if (CONFIG_SDIO_DMAPRIO & ~DMA_SCR_PL_MASK) != 0 # error "Illegal value for CONFIG_SDIO_DMAPRIO" # endif # else # error "Unknown STM32 DMA" # endif #else # undef CONFIG_SDIO_DMAPRIO #endif #if !defined(CONFIG_DEBUG_FS) || !defined(CONFIG_DEBUG) # undef CONFIG_SDIO_XFRDEBUG #endif /* Friendly CLKCR bit re-definitions ****************************************/ #define SDIO_CLKCR_RISINGEDGE (0) #define SDIO_CLKCR_FALLINGEDGE SDIO_CLKCR_NEGEDGE /* Mode dependent settings. These depend on clock devisor settings that must * be defined in the board-specific board.h header file: SDIO_INIT_CLKDIV, * SDIO_MMCXFR_CLKDIV, and SDIO_SDXFR_CLKDIV. */ #define STM32_CLCKCR_INIT (SDIO_INIT_CLKDIV|SDIO_CLKCR_RISINGEDGE|\ SDIO_CLKCR_WIDBUS_D1) #define SDIO_CLKCR_MMCXFR (SDIO_MMCXFR_CLKDIV|SDIO_CLKCR_RISINGEDGE|\ SDIO_CLKCR_WIDBUS_D1) #define SDIO_CLCKR_SDXFR (SDIO_SDXFR_CLKDIV|SDIO_CLKCR_RISINGEDGE|\ SDIO_CLKCR_WIDBUS_D1) #define SDIO_CLCKR_SDWIDEXFR (SDIO_SDXFR_CLKDIV|SDIO_CLKCR_RISINGEDGE|\ SDIO_CLKCR_WIDBUS_D4) /* Timing */ #define SDIO_CMDTIMEOUT (100000) #define SDIO_LONGTIMEOUT (0x7fffffff) /* Big DTIMER setting */ #define SDIO_DTIMER_DATATIMEOUT (0x000fffff) /* DMA channel/stream configuration register settings. The following * must be selected. The DMA driver will select the remaining fields. * * - 32-bit DMA * - Memory increment * - Direction (memory-to-peripheral, peripheral-to-memory) * - Memory burst size (F4 only) */ /* STM32 F1 channel configuration register (CCR) settings */ #if defined(CONFIG_STM32_STM32F10XX) # define SDIO_RXDMA32_CONFIG (CONFIG_SDIO_DMAPRIO|DMA_CCR_MSIZE_32BITS|\ DMA_CCR_PSIZE_32BITS|DMA_CCR_MINC) # define SDIO_RXDMA16_CONFIG (CONFIG_SDIO_DMAPRIO|DMA_CCR_MSIZE_16BITS|\ DMA_CCR_PSIZE_32BITS|DMA_CCR_MINC) # define SDIO_TXDMA32_CONFIG (CONFIG_SDIO_DMAPRIO|DMA_CCR_MSIZE_32BITS|\ DMA_CCR_PSIZE_32BITS|DMA_CCR_MINC|DMA_CCR_DIR) # define SDIO_TXDMA16_CONFIG (CONFIG_SDIO_DMAPRIO|DMA_CCR_MSIZE_16BITS|\ DMA_CCR_PSIZE_32BITS|DMA_CCR_MINC|DMA_CCR_DIR) /* STM32 F4 stream configuration register (SCR) settings. */ #elif defined(CONFIG_STM32_STM32F20XX) || defined(CONFIG_STM32_STM32F40XX) # define SDIO_RXDMA32_CONFIG (DMA_SCR_PFCTRL|DMA_SCR_DIR_P2M|DMA_SCR_MINC|\ DMA_SCR_PSIZE_32BITS|DMA_SCR_MSIZE_32BITS|\ CONFIG_SDIO_DMAPRIO|DMA_SCR_PBURST_INCR4|\ DMA_SCR_MBURST_INCR4) # define SDIO_RXDMA16_CONFIG (DMA_SCR_PFCTRL|DMA_SCR_DIR_P2M|DMA_SCR_MINC|\ DMA_SCR_PSIZE_32BITS|DMA_SCR_MSIZE_16BITS|\ CONFIG_SDIO_DMAPRIO|DMA_SCR_PBURST_INCR4|\ DMA_SCR_MBURST_INCR4) # define SDIO_TXDMA32_CONFIG (DMA_SCR_PFCTRL|DMA_SCR_DIR_M2P|DMA_SCR_MINC|\ DMA_SCR_PSIZE_32BITS|DMA_SCR_MSIZE_32BITS|\ CONFIG_SDIO_DMAPRIO|DMA_SCR_PBURST_INCR4|\ DMA_SCR_MBURST_INCR4) # define SDIO_TXDMA16_CONFIG (DMA_SCR_PFCTRL|DMA_SCR_DIR_M2P|DMA_SCR_MINC|\ DMA_SCR_PSIZE_32BITS|DMA_SCR_MSIZE_16BITS|\ CONFIG_SDIO_DMAPRIO|DMA_SCR_PBURST_INCR4|\ DMA_SCR_MBURST_INCR4) #else # error "Unknown STM32 DMA" #endif /* SDIO DMA Channel/Stream selection. For the the case of the STM32 F4, there * are multiple DMA stream options that must be dis-ambiguated in the board.h * file. */ #if defined(CONFIG_STM32_STM32F10XX) # define SDIO_DMACHAN DMACHAN_SDIO #elif defined(CONFIG_STM32_STM32F20XX) || defined(CONFIG_STM32_STM32F40XX) # define SDIO_DMACHAN DMAMAP_SDIO #else # error "Unknown STM32 DMA" #endif /* FIFO sizes */ #define SDIO_HALFFIFO_WORDS (8) #define SDIO_HALFFIFO_BYTES (8*4) /* Data transfer interrupt mask bits */ #define SDIO_RECV_MASK (SDIO_MASK_DCRCFAILIE|SDIO_MASK_DTIMEOUTIE|\ SDIO_MASK_DATAENDIE|SDIO_MASK_RXOVERRIE|\ SDIO_MASK_RXFIFOHFIE|SDIO_MASK_STBITERRIE) #define SDIO_SEND_MASK (SDIO_MASK_DCRCFAILIE|SDIO_MASK_DTIMEOUTIE|\ SDIO_MASK_DATAENDIE|SDIO_MASK_TXUNDERRIE|\ SDIO_MASK_TXFIFOHEIE|SDIO_MASK_STBITERRIE) #define SDIO_DMARECV_MASK (SDIO_MASK_DCRCFAILIE|SDIO_MASK_DTIMEOUTIE|\ SDIO_MASK_DATAENDIE|SDIO_MASK_RXOVERRIE|\ SDIO_MASK_STBITERRIE) #define SDIO_DMASEND_MASK (SDIO_MASK_DCRCFAILIE|SDIO_MASK_DTIMEOUTIE|\ SDIO_MASK_DATAENDIE|SDIO_MASK_TXUNDERRIE|\ SDIO_MASK_STBITERRIE) /* Event waiting interrupt mask bits */ #define SDIO_CMDDONE_STA (SDIO_STA_CMDSENT) #define SDIO_RESPDONE_STA (SDIO_STA_CTIMEOUT|SDIO_STA_CCRCFAIL|\ SDIO_STA_CMDREND) #define SDIO_XFRDONE_STA (0) #define SDIO_CMDDONE_MASK (SDIO_MASK_CMDSENTIE) #define SDIO_RESPDONE_MASK (SDIO_MASK_CCRCFAILIE|SDIO_MASK_CTIMEOUTIE|\ SDIO_MASK_CMDRENDIE) #define SDIO_XFRDONE_MASK (0) #define SDIO_CMDDONE_ICR (SDIO_ICR_CMDSENTC) #define SDIO_RESPDONE_ICR (SDIO_ICR_CTIMEOUTC|SDIO_ICR_CCRCFAILC|\ SDIO_ICR_CMDRENDC) #define SDIO_XFRDONE_ICR (SDIO_ICR_DATAENDC|SDIO_ICR_DCRCFAILC|\ SDIO_ICR_DTIMEOUTC|SDIO_ICR_RXOVERRC|\ SDIO_ICR_TXUNDERRC|SDIO_ICR_STBITERRC) #define SDIO_WAITALL_ICR (SDIO_CMDDONE_ICR|SDIO_RESPDONE_ICR|\ SDIO_XFRDONE_ICR) /* Let's wait until we have both SDIO transfer complete and DMA complete. */ #define SDIO_XFRDONE_FLAG (1) #define SDIO_DMADONE_FLAG (2) #define SDIO_ALLDONE (3) /* Register logging support */ #ifdef CONFIG_SDIO_XFRDEBUG # ifdef CONFIG_SDIO_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 DEBUG_NSAMPLES 5 # else # define SAMPLENDX_BEFORE_SETUP 0 # define SAMPLENDX_AFTER_SETUP 1 # define SAMPLENDX_END_TRANSFER 2 # define DEBUG_NSAMPLES 3 # endif #endif /**************************************************************************** * Private Types ****************************************************************************/ /* This structure defines the state of the STM32 SDIO interface */ struct stm32_dev_s { struct sdio_dev_s dev; /* Standard, base SDIO interface */ /* STM32-specific extensions */ /* Event support */ sem_t waitsem; /* Implements event waiting */ sdio_eventset_t waitevents; /* Set of events to be waited for */ uint32_t waitmask; /* 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 xfrmask; /* Interrupt enables for data transfer */ /* DMA data transfer support */ bool widebus; /* Required for DMA support */ #ifdef CONFIG_SDIO_DMA volatile uint8_t xfrflags; /* Used to synchronize SDIO and DMA completion events */ bool dmamode; /* true: DMA mode transfer */ DMA_HANDLE dma; /* Handle for DMA channel */ #endif }; /* Register logging support */ #ifdef CONFIG_SDIO_XFRDEBUG struct stm32_sdioregs_s { uint8_t power; uint16_t clkcr; uint16_t dctrl; uint32_t dtimer; uint32_t dlen; uint32_t dcount; uint32_t sta; uint32_t mask; uint32_t fifocnt; }; struct stm32_sampleregs_s { struct stm32_sdioregs_s sdio; #if defined(CONFIG_DEBUG_DMA) && defined(CONFIG_SDIO_DMA) struct stm32_dmaregs_s dma; #endif }; #endif /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* Low-level helpers ********************************************************/ static void stm32_takesem(struct stm32_dev_s *priv); #define stm32_givesem(priv) (sem_post(&priv->waitsem)) static inline void stm32_setclkcr(uint32_t clkcr); static void stm32_configwaitints(struct stm32_dev_s *priv, uint32_t waitmask, sdio_eventset_t waitevents, sdio_eventset_t wkupevents); static void stm32_configxfrints(struct stm32_dev_s *priv, uint32_t xfrmask); static void stm32_setpwrctrl(uint32_t pwrctrl); static inline uint32_t stm32_getpwrctrl(void); /* DMA Helpers **************************************************************/ #ifdef CONFIG_SDIO_XFRDEBUG static void stm32_sampleinit(void); static void stm32_sdiosample(struct stm32_sdioregs_s *regs); static void stm32_sample(struct stm32_dev_s *priv, int index); static void stm32_sdiodump(struct stm32_sdioregs_s *regs, const char *msg); static void stm32_dumpsample(struct stm32_dev_s *priv, struct stm32_sampleregs_s *regs, const char *msg); static void stm32_dumpsamples(struct stm32_dev_s *priv); #else # define stm32_sampleinit() # define stm32_sample(priv,index) # define stm32_dumpsamples(priv) #endif #ifdef CONFIG_SDIO_DMA static void stm32_dmacallback(DMA_HANDLE handle, uint8_t status, void *arg); #endif /* Data Transfer Helpers ****************************************************/ static uint8_t stm32_log2(uint16_t value); static void stm32_dataconfig(uint32_t timeout, uint32_t dlen, uint32_t dctrl); static void stm32_datadisable(void); static void stm32_sendfifo(struct stm32_dev_s *priv); static void stm32_recvfifo(struct stm32_dev_s *priv); static void stm32_eventtimeout(int argc, uint32_t arg); static void stm32_endwait(struct stm32_dev_s *priv, sdio_eventset_t wkupevent); static void stm32_endtransfer(struct stm32_dev_s *priv, sdio_eventset_t wkupevent); /* Interrupt Handling *******************************************************/ static int stm32_interrupt(int irq, void *context); /* SDIO interface methods ***************************************************/ /* Mutual exclusion */ #ifdef CONFIG_SDIO_MUXBUS static int stm32_lock(FAR struct sdio_dev_s *dev, bool lock); #endif /* Initialization/setup */ static void stm32_reset(FAR struct sdio_dev_s *dev); static uint8_t stm32_status(FAR struct sdio_dev_s *dev); static void stm32_widebus(FAR struct sdio_dev_s *dev, bool enable); static void stm32_clock(FAR struct sdio_dev_s *dev, enum sdio_clock_e rate); static int stm32_attach(FAR struct sdio_dev_s *dev); /* Command/Status/Data Transfer */ static int stm32_sendcmd(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t arg); static int stm32_recvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer, size_t nbytes); static int stm32_sendsetup(FAR struct sdio_dev_s *dev, FAR const uint8_t *buffer, uint32_t nbytes); static int stm32_cancel(FAR struct sdio_dev_s *dev); static int stm32_waitresponse(FAR struct sdio_dev_s *dev, uint32_t cmd); static int stm32_recvshortcrc(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t *rshort); static int stm32_recvlong(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t rlong[4]); static int stm32_recvshort(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t *rshort); static int stm32_recvnotimpl(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t *rnotimpl); /* EVENT handler */ static void stm32_waitenable(FAR struct sdio_dev_s *dev, sdio_eventset_t eventset); static sdio_eventset_t stm32_eventwait(FAR struct sdio_dev_s *dev, uint32_t timeout); static void stm32_callbackenable(FAR struct sdio_dev_s *dev, sdio_eventset_t eventset); static int stm32_registercallback(FAR struct sdio_dev_s *dev, worker_t callback, void *arg); /* DMA */ #ifdef CONFIG_SDIO_DMA static bool stm32_dmasupported(FAR struct sdio_dev_s *dev); static int stm32_dmarecvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer, size_t buflen); static int stm32_dmasendsetup(FAR struct sdio_dev_s *dev, FAR const uint8_t *buffer, size_t buflen); #endif /* Initialization/uninitialization/reset ************************************/ static void stm32_callback(void *arg); static void stm32_default(void); /**************************************************************************** * Private Data ****************************************************************************/ struct stm32_dev_s g_sdiodev = { .dev = { #ifdef CONFIG_SDIO_MUXBUS .lock = stm32_lock, #endif .reset = stm32_reset, .status = stm32_status, .widebus = stm32_widebus, .clock = stm32_clock, .attach = stm32_attach, .sendcmd = stm32_sendcmd, .recvsetup = stm32_recvsetup, .sendsetup = stm32_sendsetup, .cancel = stm32_cancel, .waitresponse = stm32_waitresponse, .recvR1 = stm32_recvshortcrc, .recvR2 = stm32_recvlong, .recvR3 = stm32_recvshort, .recvR4 = stm32_recvnotimpl, .recvR5 = stm32_recvnotimpl, .recvR6 = stm32_recvshortcrc, .recvR7 = stm32_recvshort, .waitenable = stm32_waitenable, .eventwait = stm32_eventwait, .callbackenable = stm32_callbackenable, .registercallback = stm32_registercallback, #ifdef CONFIG_SDIO_DMA .dmasupported = stm32_dmasupported, .dmarecvsetup = stm32_dmarecvsetup, .dmasendsetup = stm32_dmasendsetup, #endif }, }; /* Register logging support */ #ifdef CONFIG_SDIO_XFRDEBUG static struct stm32_sampleregs_s g_sampleregs[DEBUG_NSAMPLES]; #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Low-level Helpers ****************************************************************************/ /**************************************************************************** * Name: stm32_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 stm32_takesem(struct stm32_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: stm32_setclkcr * * Description: * Modify oft-changed bits in the CLKCR register. Only the following bit- * fields are changed: * * CLKDIV, PWRSAV, BYPASS, WIDBUS, NEGEDGE, and HWFC_EN * * Input Parameters: * clkcr - A new CLKCR setting for the above mentions bits (other bits * are ignored. * * Returned Value: * None * ****************************************************************************/ static inline void stm32_setclkcr(uint32_t clkcr) { uint32_t regval = getreg32(STM32_SDIO_CLKCR); /* Clear CLKDIV, PWRSAV, BYPASS, WIDBUS, NEGEDGE, HWFC_EN bits */ regval &= ~(SDIO_CLKCR_CLKDIV_MASK|SDIO_CLKCR_PWRSAV|SDIO_CLKCR_BYPASS| SDIO_CLKCR_WIDBUS_MASK|SDIO_CLKCR_NEGEDGE|SDIO_CLKCR_HWFC_EN| SDIO_CLKCR_CLKEN); /* Replace with user provided settings */ clkcr &= (SDIO_CLKCR_CLKDIV_MASK|SDIO_CLKCR_PWRSAV|SDIO_CLKCR_BYPASS| SDIO_CLKCR_WIDBUS_MASK|SDIO_CLKCR_NEGEDGE|SDIO_CLKCR_HWFC_EN| SDIO_CLKCR_CLKEN); regval |= clkcr; putreg32(regval, STM32_SDIO_CLKCR); fvdbg("CLKCR: %08x PWR: %08x\n", getreg32(STM32_SDIO_CLKCR), getreg32(STM32_SDIO_POWER)); } /**************************************************************************** * Name: stm32_configwaitints * * Description: * Enable/disable SDIO interrupts needed to suport the wait function * * Input Parameters: * priv - A reference to the SDIO device state structure * waitmask - The set of bits in the SDIO MASK register to set * waitevents - Waited for events * wkupevent - Wake-up events * * Returned Value: * None * ****************************************************************************/ static void stm32_configwaitints(struct stm32_dev_s *priv, uint32_t waitmask, 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->waitmask = waitmask; #ifdef CONFIG_SDIO_DMA priv->xfrflags = 0; #endif putreg32(priv->xfrmask | priv->waitmask, STM32_SDIO_MASK); irqrestore(flags); } /**************************************************************************** * Name: stm32_configxfrints * * Description: * Enable SDIO interrupts needed to support the data transfer event * * Input Parameters: * priv - A reference to the SDIO device state structure * xfrmask - The set of bits in the SDIO MASK register to set * * Returned Value: * None * ****************************************************************************/ static void stm32_configxfrints(struct stm32_dev_s *priv, uint32_t xfrmask) { irqstate_t flags; flags = irqsave(); priv->xfrmask = xfrmask; putreg32(priv->xfrmask | priv->waitmask, STM32_SDIO_MASK); irqrestore(flags); } /**************************************************************************** * Name: stm32_setpwrctrl * * Description: * Change the PWRCTRL field of the SDIO POWER register to turn the SDIO * ON or OFF * * Input Parameters: * clkcr - A new PWRCTRL setting * * Returned Value: * None * ****************************************************************************/ static void stm32_setpwrctrl(uint32_t pwrctrl) { uint32_t regval; regval = getreg32(STM32_SDIO_POWER); regval &= ~SDIO_POWER_PWRCTRL_MASK; regval |= pwrctrl; putreg32(regval, STM32_SDIO_POWER); } /**************************************************************************** * Name: stm32_getpwrctrl * * Description: * Return the current value of the the PWRCTRL field of the SDIO POWER * register. This function can be used to see the the SDIO is power ON * or OFF * * Input Parameters: * None * * Returned Value: * The current value of the the PWRCTRL field of the SDIO POWER register. * ****************************************************************************/ static inline uint32_t stm32_getpwrctrl(void) { return getreg32(STM32_SDIO_POWER) & SDIO_POWER_PWRCTRL_MASK; } /**************************************************************************** * DMA Helpers ****************************************************************************/ /**************************************************************************** * Name: stm32_sampleinit * * Description: * Setup prior to collecting DMA samples * ****************************************************************************/ #ifdef CONFIG_SDIO_XFRDEBUG static void stm32_sampleinit(void) { memset(g_sampleregs, 0xff, DEBUG_NSAMPLES * sizeof(struct stm32_sampleregs_s)); } #endif /**************************************************************************** * Name: stm32_sdiosample * * Description: * Sample SDIO registers * ****************************************************************************/ #ifdef CONFIG_SDIO_XFRDEBUG static void stm32_sdiosample(struct stm32_sdioregs_s *regs) { regs->power = (uint8_t)getreg32(STM32_SDIO_POWER); regs->clkcr = (uint16_t)getreg32(STM32_SDIO_CLKCR); regs->dctrl = (uint16_t)getreg32(STM32_SDIO_DCTRL); regs->dtimer = getreg32(STM32_SDIO_DTIMER); regs->dlen = getreg32(STM32_SDIO_DLEN); regs->dcount = getreg32(STM32_SDIO_DCOUNT); regs->sta = getreg32(STM32_SDIO_STA); regs->mask = getreg32(STM32_SDIO_MASK); regs->fifocnt = getreg32(STM32_SDIO_FIFOCNT); } #endif /**************************************************************************** * Name: stm32_sample * * Description: * Sample SDIO/DMA registers * ****************************************************************************/ #ifdef CONFIG_SDIO_XFRDEBUG static void stm32_sample(struct stm32_dev_s *priv, int index) { struct stm32_sampleregs_s *regs = &g_sampleregs[index]; #if defined(CONFIG_DEBUG_DMA) && defined(CONFIG_SDIO_DMA) if (priv->dmamode) { stm32_dmasample(priv->dma, ®s->dma); } #endif stm32_sdiosample(®s->sdio); } #endif /**************************************************************************** * Name: stm32_sdiodump * * Description: * Dump one register sample * ****************************************************************************/ #ifdef CONFIG_SDIO_XFRDEBUG static void stm32_sdiodump(struct stm32_sdioregs_s *regs, const char *msg) { fdbg("SDIO Registers: %s\n", msg); fdbg(" POWER[%08x]: %08x\n", STM32_SDIO_POWER, regs->power); fdbg(" CLKCR[%08x]: %08x\n", STM32_SDIO_CLKCR, regs->clkcr); fdbg(" DCTRL[%08x]: %08x\n", STM32_SDIO_DCTRL, regs->dctrl); fdbg(" DTIMER[%08x]: %08x\n", STM32_SDIO_DTIMER, regs->dtimer); fdbg(" DLEN[%08x]: %08x\n", STM32_SDIO_DLEN, regs->dlen); fdbg(" DCOUNT[%08x]: %08x\n", STM32_SDIO_DCOUNT, regs->dcount); fdbg(" STA[%08x]: %08x\n", STM32_SDIO_STA, regs->sta); fdbg(" MASK[%08x]: %08x\n", STM32_SDIO_MASK, regs->mask); fdbg("FIFOCNT[%08x]: %08x\n", STM32_SDIO_FIFOCNT, regs->fifocnt); } #endif /**************************************************************************** * Name: stm32_dumpsample * * Description: * Dump one register sample * ****************************************************************************/ #ifdef CONFIG_SDIO_XFRDEBUG static void stm32_dumpsample(struct stm32_dev_s *priv, struct stm32_sampleregs_s *regs, const char *msg) { #if defined(CONFIG_DEBUG_DMA) && defined(CONFIG_SDIO_DMA) if (priv->dmamode) { stm32_dmadump(priv->dma, ®s->dma, msg); } #endif stm32_sdiodump(®s->sdio, msg); } #endif /**************************************************************************** * Name: stm32_dumpsamples * * Description: * Dump all sampled register data * ****************************************************************************/ #ifdef CONFIG_SDIO_XFRDEBUG static void stm32_dumpsamples(struct stm32_dev_s *priv) { stm32_dumpsample(priv, &g_sampleregs[SAMPLENDX_BEFORE_SETUP], "Before setup"); #if defined(CONFIG_DEBUG_DMA) && defined(CONFIG_SDIO_DMA) if (priv->dmamode) { stm32_dumpsample(priv, &g_sampleregs[SAMPLENDX_BEFORE_ENABLE], "Before DMA enable"); } #endif stm32_dumpsample(priv, &g_sampleregs[SAMPLENDX_AFTER_SETUP], "After setup"); stm32_dumpsample(priv, &g_sampleregs[SAMPLENDX_END_TRANSFER], "End of transfer"); #if defined(CONFIG_DEBUG_DMA) && defined(CONFIG_SDIO_DMA) if (priv->dmamode) { stm32_dumpsample(priv, &g_sampleregs[SAMPLENDX_DMA_CALLBACK], "DMA Callback"); } #endif } #endif /**************************************************************************** * Name: stm32_dmacallback * * Description: * Called when SDIO DMA completes * ****************************************************************************/ #ifdef CONFIG_SDIO_DMA static void stm32_dmacallback(DMA_HANDLE handle, uint8_t status, void *arg) { FAR struct stm32_dev_s *priv = (FAR struct stm32_dev_s *)arg; DEBUGASSERT(priv->dmamode); sdio_eventset_t result; /* In the normal case, SDIO appears to handle the End-Of-Transfer interrupt * first with the End-Of-DMA event occurring significantly later. On * transfer errors, however, the DMA error will occur before the End-of- * Transfer. */ stm32_sample((struct stm32_dev_s*)arg, SAMPLENDX_DMA_CALLBACK); /* Get the result of the DMA transfer */ if ((status & DMA_STATUS_ERROR) != 0) { flldbg("DMA error %02x, remaining: %d\n", status, priv->remaining); result = SDIOWAIT_ERROR; } else { result = SDIOWAIT_TRANSFERDONE; } /* Then terminate the transfer if this completes all of the steps in the * transfer OR if a DMA error occurred. In the non-error case, we should * already have the SDIO transfer done interrupt. If not, the transfer * will appropriately time out. */ priv->xfrflags |= SDIO_DMADONE_FLAG; if (priv->xfrflags == SDIO_ALLDONE || result == SDIOWAIT_ERROR) { stm32_endtransfer(priv, result); } } #endif /**************************************************************************** * Data Transfer Helpers ****************************************************************************/ /**************************************************************************** * Name: stm32_log2 * * Description: * Take (approximate) log base 2 of the provided number (Only works if the * provided number is a power of 2). * ****************************************************************************/ static uint8_t stm32_log2(uint16_t value) { uint8_t log2 = 0; /* 0000 0000 0000 0001 -> return 0, * 0000 0000 0000 001x -> return 1, * 0000 0000 0000 01xx -> return 2, * 0000 0000 0000 1xxx -> return 3, * ... * 1xxx xxxx xxxx xxxx -> return 15, */ DEBUGASSERT(value > 0); while (value != 1) { value >>= 1; log2++; } return log2; } /**************************************************************************** * Name: stm32_dataconfig * * Description: * Configure the SDIO data path for the next data transfer * ****************************************************************************/ static void stm32_dataconfig(uint32_t timeout, uint32_t dlen, uint32_t dctrl) { uint32_t regval = 0; /* Enable data path */ putreg32(timeout, STM32_SDIO_DTIMER); /* Set DTIMER */ putreg32(dlen, STM32_SDIO_DLEN); /* Set DLEN */ /* Configure DCTRL DTDIR, DTMODE, and DBLOCKSIZE fields and set the DTEN * field */ regval = getreg32(STM32_SDIO_DCTRL); regval &= ~(SDIO_DCTRL_DTDIR|SDIO_DCTRL_DTMODE|SDIO_DCTRL_DBLOCKSIZE_MASK); dctrl &= (SDIO_DCTRL_DTDIR|SDIO_DCTRL_DTMODE|SDIO_DCTRL_DBLOCKSIZE_MASK); regval |= (dctrl|SDIO_DCTRL_DTEN); putreg32(regval, STM32_SDIO_DCTRL); } /**************************************************************************** * Name: stm32_datadisable * * Description: * Disable the the SDIO data path setup by stm32_dataconfig() and * disable DMA. * ****************************************************************************/ static void stm32_datadisable(void) { uint32_t regval; /* Disable the data path */ putreg32(SDIO_DTIMER_DATATIMEOUT, STM32_SDIO_DTIMER); /* Reset DTIMER */ putreg32(0, STM32_SDIO_DLEN); /* Reset DLEN */ /* Reset DCTRL DTEN, DTDIR, DTMODE, DMAEN, and DBLOCKSIZE fields */ regval = getreg32(STM32_SDIO_DCTRL); regval &= ~(SDIO_DCTRL_DTEN|SDIO_DCTRL_DTDIR|SDIO_DCTRL_DTMODE| SDIO_DCTRL_DMAEN|SDIO_DCTRL_DBLOCKSIZE_MASK); putreg32(regval, STM32_SDIO_DCTRL); } /**************************************************************************** * Name: stm32_sendfifo * * Description: * Send SDIO data in interrupt mode * * Input Parameters: * priv - An instance of the SDIO device interface * * Returned Value: * None * ****************************************************************************/ static void stm32_sendfifo(struct stm32_dev_s *priv) { union { uint32_t w; uint8_t b[4]; } data; /* Loop while there is more data to be sent and the RX FIFO is not full */ while (priv->remaining > 0 && (getreg32(STM32_SDIO_STA) & SDIO_STA_TXFIFOF) == 0) { /* 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, STM32_SDIO_FIFO); } } /**************************************************************************** * Name: stm32_recvfifo * * Description: * Receive SDIO data in interrupt mode * * Input Parameters: * priv - An instance of the SDIO device interface * * Returned Value: * None * ****************************************************************************/ static void stm32_recvfifo(struct stm32_dev_s *priv) { union { uint32_t w; uint8_t b[4]; } data; /* Loop while there is space to store the data and there is more * data available in the RX FIFO. */ while (priv->remaining > 0 && (getreg32(STM32_SDIO_STA) & SDIO_STA_RXDAVL) != 0) { /* Read the next word from the RX FIFO */ data.w = getreg32(STM32_SDIO_FIFO); 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; } } } /**************************************************************************** * Name: stm32_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 stm32_eventtimeout(int argc, uint32_t arg) { struct stm32_dev_s *priv = (struct stm32_dev_s *)arg; /* There is always race conditions with timer expirations. */ DEBUGASSERT((priv->waitevents & SDIOWAIT_TIMEOUT) != 0 || priv->wkupevent != 0); /* Is a data transfer complete event expected? */ if ((priv->waitevents & SDIOWAIT_TIMEOUT) != 0) { /* Yes.. wake up any waiting threads */ stm32_endwait(priv, SDIOWAIT_TIMEOUT); flldbg("Timeout: remaining: %d\n", priv->remaining); } } /**************************************************************************** * Name: stm32_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 stm32_endwait(struct stm32_dev_s *priv, sdio_eventset_t wkupevent) { /* Cancel the watchdog timeout */ (void)wd_cancel(priv->waitwdog); /* Disable event-related interrupts */ stm32_configwaitints(priv, 0, 0, wkupevent); /* Wake up the waiting thread */ stm32_givesem(priv); } /**************************************************************************** * Name: stm32_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 stm32_endtransfer(struct stm32_dev_s *priv, sdio_eventset_t wkupevent) { /* Disable all transfer related interrupts */ stm32_configxfrints(priv, 0); /* Clearing pending interrupt status on all transfer related interrupts */ putreg32(SDIO_XFRDONE_ICR, STM32_SDIO_ICR); /* If this was a DMA transfer, make sure that DMA is stopped */ #ifdef CONFIG_SDIO_DMA if (priv->dmamode) { /* DMA debug instrumentation */ stm32_sample(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). */ stm32_dmastop(priv->dma); } #endif /* Mark the transfer finished */ priv->remaining = 0; /* Is a thread wait for these data transfer complete events? */ if ((priv->waitevents & wkupevent) != 0) { /* Yes.. wake up any waiting threads */ stm32_endwait(priv, wkupevent); } } /**************************************************************************** * Interrrupt Handling ****************************************************************************/ /**************************************************************************** * Name: stm32_interrupt * * Description: * SDIO interrupt handler * * Input Parameters: * dev - An instance of the SDIO device interface * * Returned Value: * None * ****************************************************************************/ static int stm32_interrupt(int irq, void *context) { struct stm32_dev_s *priv = &g_sdiodev; uint32_t enabled; uint32_t pending; /* Loop while there are pending interrupts. Check the SDIO 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 STA and MASK register). If there are non-zero * bits remaining, then we have work to do here. */ while ((enabled = getreg32(STM32_SDIO_STA) & getreg32(STM32_SDIO_MASK)) != 0) { /* Handle in progress, interrupt driven data transfers ****************/ pending = enabled & priv->xfrmask; if (pending != 0) { #ifdef CONFIG_SDIO_DMA if (!priv->dmamode) #endif { /* Is the RX FIFO half full or more? Is so then we must be * processing a receive transaction. */ if ((pending & SDIO_STA_RXFIFOHF) != 0) { /* Receive data from the RX FIFO */ stm32_recvfifo(priv); } /* Otherwise, Is the transmit FIFO half empty or less? If so we must * be processing a send transaction. NOTE: We can't be processing * both! */ else if ((pending & SDIO_STA_TXFIFOHE) != 0) { /* Send data via the TX FIFO */ stm32_sendfifo(priv); } } /* Handle data end events */ if ((pending & SDIO_STA_DATAEND) != 0) { /* Handle any data remaining the RX FIFO. If the RX FIFO is * less than half full at the end of the transfer, then no * half-full interrupt will be received. */ /* Was this transfer performed in DMA mode? */ #ifdef CONFIG_SDIO_DMA if (priv->dmamode) { /* Yes.. Terminate the transfers only if the DMA has also * finished. */ priv->xfrflags |= SDIO_XFRDONE_FLAG; if (priv->xfrflags == SDIO_ALLDONE) { stm32_endtransfer(priv, SDIOWAIT_TRANSFERDONE); } /* Otherwise, just disable futher transfer interrupts and * wait for the DMA complete event. */ else { stm32_configxfrints(priv, 0); } } else #endif { /* Receive data from the RX FIFO */ stm32_recvfifo(priv); /* Then terminate the transfer */ stm32_endtransfer(priv, SDIOWAIT_TRANSFERDONE); } } /* Handle data block send/receive CRC failure */ else if ((pending & SDIO_STA_DCRCFAIL) != 0) { /* Terminate the transfer with an error */ flldbg("ERROR: Data block CRC failure, remaining: %d\n", priv->remaining); stm32_endtransfer(priv, SDIOWAIT_TRANSFERDONE|SDIOWAIT_ERROR); } /* Handle data timeout error */ else if ((pending & SDIO_STA_DTIMEOUT) != 0) { /* Terminate the transfer with an error */ flldbg("ERROR: Data timeout, remaining: %d\n", priv->remaining); stm32_endtransfer(priv, SDIOWAIT_TRANSFERDONE|SDIOWAIT_TIMEOUT); } /* Handle RX FIFO overrun error */ else if ((pending & SDIO_STA_RXOVERR) != 0) { /* Terminate the transfer with an error */ flldbg("ERROR: RX FIFO overrun, remaining: %d\n", priv->remaining); stm32_endtransfer(priv, SDIOWAIT_TRANSFERDONE|SDIOWAIT_ERROR); } /* Handle TX FIFO underrun error */ else if ((pending & SDIO_STA_TXUNDERR) != 0) { /* Terminate the transfer with an error */ flldbg("ERROR: TX FIFO underrun, remaining: %d\n", priv->remaining); stm32_endtransfer(priv, SDIOWAIT_TRANSFERDONE|SDIOWAIT_ERROR); } /* Handle start bit error */ else if ((pending & SDIO_STA_STBITERR) != 0) { /* Terminate the transfer with an error */ flldbg("ERROR: Start bit, remaining: %d\n", priv->remaining); stm32_endtransfer(priv, SDIOWAIT_TRANSFERDONE|SDIOWAIT_ERROR); } } /* Handle wait events *************************************************/ pending = enabled & priv->waitmask; if (pending != 0) { /* Is this a response completion event? */ if ((pending & SDIO_RESPDONE_STA) != 0) { /* Yes.. Is their a thread waiting for response done? */ if ((priv->waitevents & SDIOWAIT_RESPONSEDONE) != 0) { /* Yes.. wake the thread up */ putreg32(SDIO_RESPDONE_ICR|SDIO_CMDDONE_ICR, STM32_SDIO_ICR); stm32_endwait(priv, SDIOWAIT_RESPONSEDONE); } } /* Is this a command completion event? */ if ((pending & SDIO_CMDDONE_STA) != 0) { /* Yes.. Is their a thread waiting for command done? */ if ((priv->waitevents & SDIOWAIT_RESPONSEDONE) != 0) { /* Yes.. wake the thread up */ putreg32(SDIO_CMDDONE_ICR, STM32_SDIO_ICR); stm32_endwait(priv, SDIOWAIT_CMDDONE); } } } } return OK; } /**************************************************************************** * SDIO Interface Methods ****************************************************************************/ /**************************************************************************** * Name: stm32_lock * * Description: * Locks the bus. Function calls low-level multiplexed bus routines to * resolve bus requests and acknowledgment 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 stm32_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. */ stm32_muxbus_sdio_lock(lock); return OK; } #endif /**************************************************************************** * Name: stm32_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 stm32_reset(FAR struct sdio_dev_s *dev) { FAR struct stm32_dev_s *priv = (FAR struct stm32_dev_s *)dev; irqstate_t flags; /* Disable clocking */ flags = irqsave(); putreg32(0, SDIO_CLKCR_CLKEN_BB); stm32_setpwrctrl(SDIO_POWER_PWRCTRL_OFF); /* Put SDIO registers in their default, reset state */ stm32_default(); /* 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 */ #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->xfrmask = 0; /* Interrupt enables for data transfer */ /* DMA data transfer support */ priv->widebus = false; /* Required for DMA support */ #ifdef CONFIG_SDIO_DMA priv->dmamode = false; /* true: DMA mode transfer */ #endif /* Configure the SDIO peripheral */ stm32_setclkcr(STM32_CLCKCR_INIT | SDIO_CLKCR_CLKEN); stm32_setpwrctrl(SDIO_POWER_PWRCTRL_ON); irqrestore(flags); fvdbg("CLCKR: %08x POWER: %08x\n", getreg32(STM32_SDIO_CLKCR), getreg32(STM32_SDIO_POWER)); } /**************************************************************************** * Name: stm32_status * * Description: * Get SDIO status. * * Input Parameters: * dev - Device-specific state data * * Returned Value: * Returns a bitset of status values (see stm32_status_* defines) * ****************************************************************************/ static uint8_t stm32_status(FAR struct sdio_dev_s *dev) { struct stm32_dev_s *priv = (struct stm32_dev_s *)dev; return priv->cdstatus; } /**************************************************************************** * Name: stm32_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 stm32_widebus(FAR struct sdio_dev_s *dev, bool wide) { struct stm32_dev_s *priv = (struct stm32_dev_s *)dev; priv->widebus = wide; } /**************************************************************************** * Name: stm32_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 stm32_clock(FAR struct sdio_dev_s *dev, enum sdio_clock_e rate) { uint32_t clckr; switch (rate) { /* Disable clocking (with default ID mode divisor) */ default: case CLOCK_SDIO_DISABLED: clckr = STM32_CLCKCR_INIT; return; /* Enable in initial ID mode clocking (<400KHz) */ case CLOCK_IDMODE: clckr = (STM32_CLCKCR_INIT | SDIO_CLKCR_CLKEN); break; /* Enable in MMC normal operation clocking */ case CLOCK_MMC_TRANSFER: clckr = (SDIO_CLKCR_MMCXFR | SDIO_CLKCR_CLKEN); break; /* SD normal operation clocking (wide 4-bit mode) */ case CLOCK_SD_TRANSFER_4BIT: #ifndef CONFIG_SDIO_WIDTH_D1_ONLY clckr = (SDIO_CLCKR_SDWIDEXFR | SDIO_CLKCR_CLKEN); break; #endif /* SD normal operation clocking (narrow 1-bit mode) */ case CLOCK_SD_TRANSFER_1BIT: clckr = (SDIO_CLCKR_SDXFR | SDIO_CLKCR_CLKEN); break; } /* Set the new clock frequency along with the clock enable/disable bit */ stm32_setclkcr(clckr); } /**************************************************************************** * Name: stm32_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 stm32_attach(FAR struct sdio_dev_s *dev) { int ret; /* Attach the SDIO interrupt handler */ ret = irq_attach(STM32_IRQ_SDIO, stm32_interrupt); if (ret == OK) { /* Disable all interrupts at the SDIO controller and clear static * interrupt flags */ putreg32(SDIO_MASK_RESET, STM32_SDIO_MASK); putreg32(SDIO_ICR_STATICFLAGS, STM32_SDIO_ICR); /* Enable SDIO interrupts at the NVIC. They can now be enabled at * the SDIO controller as needed. */ up_enable_irq(STM32_IRQ_SDIO); /* Set the interrrupt priority */ up_prioritize_irq(STM32_IRQ_SDIO, CONFIG_SDIO_PRI); } return ret; } /**************************************************************************** * Name: stm32_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 stm32_sendcmd(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t arg) { uint32_t regval; uint32_t cmdidx; /* Set the SDIO Argument value */ putreg32(arg, STM32_SDIO_ARG); /* Clear CMDINDEX, WAITRESP, WAITINT, WAITPEND, and CPSMEN bits */ regval = getreg32(STM32_SDIO_CMD); regval &= ~(SDIO_CMD_CMDINDEX_MASK|SDIO_CMD_WAITRESP_MASK| SDIO_CMD_WAITINT|SDIO_CMD_WAITPEND|SDIO_CMD_CPSMEN); /* Set WAITRESP bits */ switch (cmd & MMCSD_RESPONSE_MASK) { case MMCSD_NO_RESPONSE: regval |= SDIO_CMD_NORESPONSE; break; case MMCSD_R1_RESPONSE: case MMCSD_R1B_RESPONSE: case MMCSD_R3_RESPONSE: case MMCSD_R4_RESPONSE: case MMCSD_R5_RESPONSE: case MMCSD_R6_RESPONSE: case MMCSD_R7_RESPONSE: regval |= SDIO_CMD_SHORTRESPONSE; break; case MMCSD_R2_RESPONSE: regval |= SDIO_CMD_LONGRESPONSE; break; } /* Set CPSMEN and the command index */ cmdidx = (cmd & MMCSD_CMDIDX_MASK) >> MMCSD_CMDIDX_SHIFT; regval |= cmdidx | SDIO_CMD_CPSMEN; fvdbg("cmd: %08x arg: %08x regval: %08x\n", cmd, arg, regval); /* Write the SDIO CMD */ putreg32(SDIO_RESPDONE_ICR|SDIO_CMDDONE_ICR, STM32_SDIO_ICR); putreg32(regval, STM32_SDIO_CMD); return OK; } /**************************************************************************** * Name: stm32_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 * ****************************************************************************/ static int stm32_recvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer, size_t nbytes) { struct stm32_dev_s *priv = (struct stm32_dev_s *)dev; uint32_t dblocksize; DEBUGASSERT(priv != NULL && buffer != NULL && nbytes > 0); DEBUGASSERT(((uint32_t)buffer & 3) == 0); /* Reset the DPSM configuration */ stm32_datadisable(); stm32_sampleinit(); stm32_sample(priv, SAMPLENDX_BEFORE_SETUP); /* Save the destination buffer information for use by the interrupt handler */ priv->buffer = (uint32_t*)buffer; priv->remaining = nbytes; #ifdef CONFIG_SDIO_DMA priv->dmamode = false; #endif /* Then set up the SDIO data path */ dblocksize = stm32_log2(nbytes) << SDIO_DCTRL_DBLOCKSIZE_SHIFT; stm32_dataconfig(SDIO_DTIMER_DATATIMEOUT, nbytes, dblocksize|SDIO_DCTRL_DTDIR); /* And enable interrupts */ stm32_configxfrints(priv, SDIO_RECV_MASK); stm32_sample(priv, SAMPLENDX_AFTER_SETUP); return OK; } /**************************************************************************** * Name: stm32_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 * ****************************************************************************/ static int stm32_sendsetup(FAR struct sdio_dev_s *dev, FAR const uint8_t *buffer, size_t nbytes) { struct stm32_dev_s *priv = (struct stm32_dev_s *)dev; uint32_t dblocksize; DEBUGASSERT(priv != NULL && buffer != NULL && nbytes > 0); DEBUGASSERT(((uint32_t)buffer & 3) == 0); /* Reset the DPSM configuration */ stm32_datadisable(); stm32_sampleinit(); stm32_sample(priv, SAMPLENDX_BEFORE_SETUP); /* Save the source buffer information for use by the interrupt handler */ priv->buffer = (uint32_t*)buffer; priv->remaining = nbytes; #ifdef CONFIG_SDIO_DMA priv->dmamode = false; #endif /* Then set up the SDIO data path */ dblocksize = stm32_log2(nbytes) << SDIO_DCTRL_DBLOCKSIZE_SHIFT; stm32_dataconfig(SDIO_DTIMER_DATATIMEOUT, nbytes, dblocksize); /* Enable TX interrrupts */ stm32_configxfrints(priv, SDIO_SEND_MASK); stm32_sample(priv, SAMPLENDX_AFTER_SETUP); return OK; } /**************************************************************************** * Name: stm32_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 stm32_cancel(FAR struct sdio_dev_s *dev) { struct stm32_dev_s *priv = (struct stm32_dev_s*)dev; /* Disable all transfer- and event- related interrupts */ stm32_configxfrints(priv, 0); stm32_configwaitints(priv, 0, 0, 0); /* Clearing pending interrupt status on all transfer- and event- related * interrupts */ putreg32(SDIO_WAITALL_ICR, STM32_SDIO_ICR); /* 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 if (priv->dmamode) { /* 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. */ stm32_dmastop(priv->dma); } #endif /* Mark no transfer in progress */ priv->remaining = 0; return OK; } /**************************************************************************** * Name: stm32_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 stm32_waitresponse(FAR struct sdio_dev_s *dev, uint32_t cmd) { int32_t timeout; uint32_t events; switch (cmd & MMCSD_RESPONSE_MASK) { case MMCSD_NO_RESPONSE: events = SDIO_CMDDONE_STA; timeout = SDIO_CMDTIMEOUT; break; case MMCSD_R1_RESPONSE: case MMCSD_R1B_RESPONSE: case MMCSD_R2_RESPONSE: case MMCSD_R6_RESPONSE: events = SDIO_RESPDONE_STA; timeout = SDIO_LONGTIMEOUT; break; case MMCSD_R4_RESPONSE: case MMCSD_R5_RESPONSE: return -ENOSYS; case MMCSD_R3_RESPONSE: case MMCSD_R7_RESPONSE: events = SDIO_RESPDONE_STA; timeout = SDIO_CMDTIMEOUT; break; default: return -EINVAL; } /* Then wait for the response (or timeout) */ while ((getreg32(STM32_SDIO_STA) & events) == 0) { if (--timeout <= 0) { fdbg("ERROR: Timeout cmd: %08x events: %08x STA: %08x\n", cmd, events, getreg32(STM32_SDIO_STA)); return -ETIMEDOUT; } } putreg32(SDIO_CMDDONE_ICR, STM32_SDIO_ICR); return OK; } /**************************************************************************** * Name: stm32_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 stm32_recvshortcrc(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t *rshort) { #ifdef CONFIG_DEBUG uint32_t respcmd; #endif 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 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 */ #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(STM32_SDIO_STA); if ((regval & SDIO_STA_CTIMEOUT) != 0) { fdbg("ERROR: Command timeout: %08x\n", regval); ret = -ETIMEDOUT; } else if ((regval & SDIO_STA_CCRCFAIL) != 0) { fdbg("ERROR: CRC failure: %08x\n", regval); ret = -EIO; } #ifdef CONFIG_DEBUG else { /* Check response received is of desired command */ respcmd = getreg32(STM32_SDIO_RESPCMD); if ((uint8_t)(respcmd & SDIO_RESPCMD_MASK) != (cmd & MMCSD_CMDIDX_MASK)) { fdbg("ERROR: RESCMD=%02x CMD=%08x\n", respcmd, cmd); ret = -EINVAL; } } #endif } /* Clear all pending message completion events and return the R1/R6 response */ putreg32(SDIO_RESPDONE_ICR|SDIO_CMDDONE_ICR, STM32_SDIO_ICR); *rshort = getreg32(STM32_SDIO_RESP1); return ret; } static int stm32_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(STM32_SDIO_STA); if (regval & SDIO_STA_CTIMEOUT) { fdbg("ERROR: Timeout STA: %08x\n", regval); ret = -ETIMEDOUT; } else if (regval & SDIO_STA_CCRCFAIL) { fdbg("ERROR: CRC fail STA: %08x\n", regval); ret = -EIO; } } /* Return the long response */ putreg32(SDIO_RESPDONE_ICR|SDIO_CMDDONE_ICR, STM32_SDIO_ICR); if (rlong) { rlong[0] = getreg32(STM32_SDIO_RESP1); rlong[1] = getreg32(STM32_SDIO_RESP2); rlong[2] = getreg32(STM32_SDIO_RESP3); rlong[3] = getreg32(STM32_SDIO_RESP4); } return ret; } static int stm32_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(STM32_SDIO_STA); if (regval & SDIO_STA_CTIMEOUT) { fdbg("ERROR: Timeout STA: %08x\n", regval); ret = -ETIMEDOUT; } } putreg32(SDIO_RESPDONE_ICR|SDIO_CMDDONE_ICR, STM32_SDIO_ICR); if (rshort) { *rshort = getreg32(STM32_SDIO_RESP1); } return ret; } /* MMC responses not supported */ static int stm32_recvnotimpl(FAR struct sdio_dev_s *dev, uint32_t cmd, uint32_t *rnotimpl) { putreg32(SDIO_RESPDONE_ICR|SDIO_CMDDONE_ICR, STM32_SDIO_ICR); return -ENOSYS; } /**************************************************************************** * Name: stm32_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 stm32_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 stm32_waitenable(FAR struct sdio_dev_s *dev, sdio_eventset_t eventset) { struct stm32_dev_s *priv = (struct stm32_dev_s*)dev; uint32_t waitmask; DEBUGASSERT(priv != NULL); /* Disable event-related interrupts */ stm32_configwaitints(priv, 0, 0, 0); /* Select the interrupt mask that will give us the appropriate wakeup * interrupts. */ waitmask = 0; if ((eventset & SDIOWAIT_CMDDONE) != 0) { waitmask |= SDIO_CMDDONE_MASK; } if ((eventset & SDIOWAIT_RESPONSEDONE) != 0) { waitmask |= SDIO_RESPDONE_MASK; } if ((eventset & SDIOWAIT_TRANSFERDONE) != 0) { waitmask |= SDIO_XFRDONE_MASK; } /* Enable event-related interrupts */ putreg32(SDIO_WAITALL_ICR, STM32_SDIO_ICR); stm32_configwaitints(priv, waitmask, eventset, 0); } /**************************************************************************** * Name: stm32_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 stm32_eventwait * returns. SDIO_WAITEVENTS must be called again before stm32_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 stm32_eventwait(FAR struct sdio_dev_s *dev, uint32_t timeout) { struct stm32_dev_s *priv = (struct stm32_dev_s*)dev; sdio_eventset_t wkupevent = 0; irqstate_t flags; 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. */ flags = irqsave(); DEBUGASSERT(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 cornercase: The user request a timeout event but * with timeout == 0? */ if (!timeout) { /* Then just tell the caller that we already timed out */ wkupevent = SDIOWAIT_TIMEOUT; goto errout; } /* Start the watchdog timer */ delay = (timeout + (MSEC_PER_TICK-1)) / MSEC_PER_TICK; ret = wd_start(priv->waitwdog, delay, (wdentry_t)stm32_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 stm32_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. */ stm32_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. */ if (wkupevent != 0) { /* Yes... break out of the loop with wkupevent non-zero */ break; } } /* Disable event-related interrupts */ stm32_configwaitints(priv, 0, 0, 0); #ifdef CONFIG_SDIO_DMA priv->xfrflags = 0; #endif errout: irqrestore(flags); stm32_dumpsamples(priv); return wkupevent; } /**************************************************************************** * Name: stm32_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 stm32_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 methos. * * 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 stm32_callbackenable(FAR struct sdio_dev_s *dev, sdio_eventset_t eventset) { struct stm32_dev_s *priv = (struct stm32_dev_s*)dev; fvdbg("eventset: %02x\n", eventset); DEBUGASSERT(priv != NULL); priv->cbevents = eventset; stm32_callback(priv); } /**************************************************************************** * Name: stm32_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 stm32_registercallback(FAR struct sdio_dev_s *dev, worker_t callback, void *arg) { struct stm32_dev_s *priv = (struct stm32_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: stm32_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 stm32_dmasupported(FAR struct sdio_dev_s *dev) { return true; } #endif /**************************************************************************** * Name: stm32_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 stm32_dmarecvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer, size_t buflen) { struct stm32_dev_s *priv = (struct stm32_dev_s *)dev; uint32_t dblocksize; int ret = -EINVAL; DEBUGASSERT(priv != NULL && buffer != NULL && buflen > 0); DEBUGASSERT(((uint32_t)buffer & 3) == 0); /* Reset the DPSM configuration */ stm32_datadisable(); /* Wide bus operation is required for DMA */ if (priv->widebus) { stm32_sampleinit(); stm32_sample(priv, SAMPLENDX_BEFORE_SETUP); /* Save the destination buffer information for use by the interrupt handler */ priv->buffer = (uint32_t*)buffer; priv->remaining = buflen; priv->dmamode = true; /* Then set up the SDIO data path */ dblocksize = stm32_log2(buflen) << SDIO_DCTRL_DBLOCKSIZE_SHIFT; stm32_dataconfig(SDIO_DTIMER_DATATIMEOUT, buflen, dblocksize|SDIO_DCTRL_DTDIR); /* Configure the RX DMA */ stm32_configxfrints(priv, SDIO_DMARECV_MASK); putreg32(1, SDIO_DCTRL_DMAEN_BB); /* On-chip SRAM is 32-bits wide. FSMC SRAM is 16-bits wide */ #ifdef CONFIG_STM32_FSMC if (STM32_IS_EXTSRAM(buffer)) { stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer, (buflen + 1) >> 1, SDIO_RXDMA16_CONFIG); } else #endif { DEBUGASSERT(STM32_IS_SRAM(buffer)); stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer, (buflen + 3) >> 2, SDIO_RXDMA32_CONFIG); } /* Start the DMA */ stm32_sample(priv, SAMPLENDX_BEFORE_ENABLE); stm32_dmastart(priv->dma, stm32_dmacallback, priv, false); stm32_sample(priv, SAMPLENDX_AFTER_SETUP); ret = OK; } return ret; } #endif /**************************************************************************** * Name: stm32_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 stm32_dmasendsetup(FAR struct sdio_dev_s *dev, FAR const uint8_t *buffer, size_t buflen) { struct stm32_dev_s *priv = (struct stm32_dev_s *)dev; uint32_t dblocksize; int ret = -EINVAL; DEBUGASSERT(priv != NULL && buffer != NULL && buflen > 0); DEBUGASSERT(((uint32_t)buffer & 3) == 0); /* Reset the DPSM configuration */ stm32_datadisable(); /* Wide bus operation is required for DMA */ if (priv->widebus) { stm32_sampleinit(); stm32_sample(priv, SAMPLENDX_BEFORE_SETUP); /* Save the source buffer information for use by the interrupt handler */ priv->buffer = (uint32_t*)buffer; priv->remaining = buflen; priv->dmamode = true; /* Then set up the SDIO data path */ dblocksize = stm32_log2(buflen) << SDIO_DCTRL_DBLOCKSIZE_SHIFT; stm32_dataconfig(SDIO_DTIMER_DATATIMEOUT, buflen, dblocksize); /* Configure the TX DMA */ /* On-chip SRAM is 32-bits wide. FSMC SRAM is 16-bits wide */ #ifdef CONFIG_STM32_FSMC if (STM32_IS_EXTSRAM(buffer)) { stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer, (buflen + 1) >> 1, SDIO_TXDMA16_CONFIG); } else #endif { DEBUGASSERT(STM32_IS_SRAM(buffer)); stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer, (buflen + 3) >> 2, SDIO_TXDMA32_CONFIG); } stm32_sample(priv, SAMPLENDX_BEFORE_ENABLE); putreg32(1, SDIO_DCTRL_DMAEN_BB); /* Start the DMA */ stm32_dmastart(priv->dma, stm32_dmacallback, priv, false); stm32_sample(priv, SAMPLENDX_AFTER_SETUP); /* Enable TX interrrupts */ stm32_configxfrints(priv, SDIO_DMASEND_MASK); ret = OK; } return ret; } #endif /**************************************************************************** * Initialization/uninitialization/reset ****************************************************************************/ /**************************************************************************** * Name: stm32_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 stm32_callback(void *arg) { struct stm32_dev_s *priv = (struct stm32_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); } } } /**************************************************************************** * Name: stm32_default * * Description: * Restore SDIO registers to their default, reset values * ****************************************************************************/ static void stm32_default(void) { putreg32(SDIO_POWER_RESET, STM32_SDIO_POWER); putreg32(SDIO_CLKCR_RESET, STM32_SDIO_CLKCR); putreg32(SDIO_ARG_RESET, STM32_SDIO_ARG); putreg32(SDIO_CMD_RESET, STM32_SDIO_CMD); putreg32(SDIO_DTIMER_RESET, STM32_SDIO_DTIMER); putreg32(SDIO_DLEN_RESET, STM32_SDIO_DLEN); putreg32(SDIO_DCTRL_RESET, STM32_SDIO_DCTRL); putreg32(SDIO_ICR_RESET, STM32_SDIO_ICR); putreg32(SDIO_MASK_RESET, STM32_SDIO_MASK); } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: sdio_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 *sdio_initialize(int slotno) { /* There is only one slot */ struct stm32_dev_s *priv = &g_sdiodev; /* Initialize the SDIO slot structure */ sem_init(&priv->waitsem, 0, 0); priv->waitwdog = wd_create(); DEBUGASSERT(priv->waitwdog); /* Allocate a DMA channel */ #ifdef CONFIG_SDIO_DMA priv->dma = stm32_dmachannel(SDIO_DMACHAN); DEBUGASSERT(priv->dma); #endif /* Configure GPIOs for 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 stm32_configgpio(GPIO_SDIO_D0); #ifndef CONFIG_SDIO_WIDTH_D1_ONLY stm32_configgpio(GPIO_SDIO_D1); stm32_configgpio(GPIO_SDIO_D2); stm32_configgpio(GPIO_SDIO_D3); #endif stm32_configgpio(GPIO_SDIO_CK); stm32_configgpio(GPIO_SDIO_CMD); #endif /* Reset the card and assure that it is in the initial, unconfigured * state. */ stm32_reset(&priv->dev); return &g_sdiodev.dev; } /**************************************************************************** * Name: sdio_mediachange * * Description: * Called by board-specific logic -- posssible 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 sdio_mediachange(FAR struct sdio_dev_s *dev, bool cardinslot) { struct stm32_dev_s *priv = (struct stm32_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) { stm32_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 sdio_wrprotect(FAR struct sdio_dev_s *dev, bool wrprotect) { struct stm32_dev_s *priv = (struct stm32_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_STM32_SDIO */