diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_sdio.c')
-rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_sdio.c | 2842 |
1 files changed, 2842 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_sdio.c b/nuttx/arch/arm/src/stm32/stm32_sdio.c new file mode 100644 index 000000000..b109160a1 --- /dev/null +++ b/nuttx/arch/arm/src/stm32/stm32_sdio.c @@ -0,0 +1,2842 @@ +/**************************************************************************** + * arch/arm/src/stm32/stm32_sdio.c + * + * Copyright (C) 2009, 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 "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_TXDMA32_CONFIG (CONFIG_SDIO_DMAPRIO|DMA_CCR_MSIZE_32BITS|\ + 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_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) +#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); + 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 */ + + 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(&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 */ |