FreeBSD/Linux Kernel Cross Reference
sys/dev/altera/sdcard/altera_sdcard.h

     /*-
      * Copyright (c) 2012 Robert N. M. Watson
      * All rights reserved.
      *
      * This software was developed by SRI International and the University of
      * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
      * ("CTSRD"), as part of the DARPA CRASH research programme.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _DEV_ALTERA_SDCARD_H_
    #define _DEV_ALTERA_SDCARD_H_
    
    #define ALTERA_SDCARD_CSD_SIZE  16
    struct altera_sdcard_csd {
            uint8_t          csd_data[ALTERA_SDCARD_CSD_SIZE];
    } __aligned(2);         /* CSD is read in 16-bit chunks, so align to match. */
    
    struct altera_sdcard_softc {
            device_t                 as_dev;
            int                      as_unit;
            struct resource         *as_res;
            int                      as_rid;
            struct mtx               as_lock;
            struct cv                as_condvar;
            int                      as_state;
            int                      as_flags;
            struct disk             *as_disk;
            struct taskqueue        *as_taskqueue;
            struct timeout_task      as_task;
    
            /*
             * Fields relating to in-progress and pending I/O, if any.
             */
            struct bio_queue_head    as_bioq;
            struct bio              *as_currentbio;
            u_int                    as_retriesleft;
    
            /*
             * Infrequently changing fields cached from the SD Card IP Core.
             */
            struct altera_sdcard_csd         as_csd;
            uint8_t                  as_csd_structure;      /* CSD version. */
            uint64_t                 as_mediasize;
    };
    
    #define ALTERA_SDCARD_LOCK(sc)          mtx_lock(&(sc)->as_lock)
    #define ALTERA_SDCARD_LOCK_ASSERT(sc)   mtx_assert(&(sc)->as_lock, MA_OWNED)
    #define ALTERA_SDCARD_LOCK_DESTROY(sc)  mtx_destroy(&(sc)->as_lock)
    #define ALTERA_SDCARD_LOCK_INIT(sc)     mtx_init(&(sc)->as_lock,        \
                                                "altera_sdcard", NULL, MTX_DEF)
    #define ALTERA_SDCARD_UNLOCK(sc)        mtx_unlock(&(sc)->as_lock)
    
    #define ALTERA_SDCARD_CONDVAR_DESTROY(sc)       cv_destroy(&(sc)->as_condvar)
    #define ALTERA_SDCARD_CONDVAR_INIT(sc)          cv_init(&(sc)->as_condvar, \
                                                        "altera_sdcard_detach_wait")
    #define ALTERA_SDCARD_CONDVAR_SIGNAL(dc)        cv_signal(&(sc)->as_condvar)
    #define ALTERA_SDCARD_CONDVAR_WAIT(sc)          cv_wait(&(sc)->as_condvar, \
                                                        &(sc)->as_lock)
    
    /*
     * States an instance can be in at any given moment.
     */
    #define ALTERA_SDCARD_STATE_NOCARD      1       /* No card inserted. */
    #define ALTERA_SDCARD_STATE_BADCARD     2       /* Card bad/not supported. */
    #define ALTERA_SDCARD_STATE_IDLE        3       /* Card present but idle. */
    #define ALTERA_SDCARD_STATE_IO          4       /* Card in I/O currently. */
    #define ALTERA_SDCARD_STATE_DETACHED    5       /* Driver is detaching. */
    
    /*
     * Different timeout intervals based on state.  When just looking for a card
     * status change, check twice a second.  When we're actively waiting on I/O
     * completion, check every millisecond.
     */
    #define ALTERA_SDCARD_TIMEOUT_NOCARD    (hz/2)
    #define ALTERA_SDCARD_TIMEOUT_IDLE      (hz/2)
    #define ALTERA_SDCARD_TIMEOUT_IO        (1)
   #define ALTERA_SDCARD_TIMEOUT_IOERROR   (hz/5)
   
   /*
    * Maximum number of retries on an I/O.
    */
   #define ALTERA_SDCARD_RETRY_LIMIT       10
   
   /*
    * Driver status flags.
    */
   #define ALTERA_SDCARD_FLAG_DETACHREQ    0x00000001      /* Detach requested. */
   #define ALTERA_SDCARD_FLAG_IOERROR      0x00000002      /* Error in progress. */
   
   /*
    * Functions for performing low-level register and memory I/O to/from the SD
    * Card IP Core.  In general, only code in altera_sdcard_io.c is aware of the
    * hardware interface.
    */
   uint16_t        altera_sdcard_read_asr(struct altera_sdcard_softc *sc);
   int             altera_sdcard_read_csd(struct altera_sdcard_softc *sc);
   
   int     altera_sdcard_io_complete(struct altera_sdcard_softc *sc,
               uint16_t asr);
   void    altera_sdcard_io_start(struct altera_sdcard_softc *sc,
               struct bio *bp);
   
   /*
    * Constants for interpreting the SD Card Card Specific Data (CSD) register.
    */
   #define ALTERA_SDCARD_CSD_STRUCTURE_BYTE        15
   #define ALTERA_SDCARD_CSD_STRUCTURE_MASK        0xc0    /* 2 bits */
   #define ALTERA_SDCARD_CSD_STRUCTURE_RSHIFT      6
   
   #define ALTERA_SDCARD_CSD_READ_BL_LEN_BYTE      10
   #define ALTERA_SDCARD_CSD_READ_BL_LEN_MASK      0x0f    /* 4 bits */
   
   /*
    * C_SIZE is a 12-bit field helpfully split over three differe bytes of CSD
    * data.  Software ease of use was not a design consideration.
    */
   #define ALTERA_SDCARD_CSD_C_SIZE_BYTE0          7
   #define ALTERA_SDCARD_CSD_C_SIZE_MASK0          0xc0    /* top 2 bits */
   #define ALTERA_SDCARD_CSD_C_SIZE_RSHIFT0        6
   
   #define ALTERA_SDCARD_CSD_C_SIZE_BYTE1          8
   #define ALTERA_SDCARD_CSD_C_SIZE_MASK1          0xff    /* 8 bits */
   #define ALTERA_SDCARD_CSD_C_SIZE_LSHIFT1        2
   
   #define ALTERA_SDCARD_CSD_C_SIZE_BYTE2          9
   #define ALTERA_SDCARD_CSD_C_SIZE_MASK2          0x03    /* bottom 2 bits */
   #define ALTERA_SDCARD_CSD_C_SIZE_LSHIFT2        10
   
   #define ALTERA_SDCARD_CSD_C_SIZE_MULT_BYTE0     5
   #define ALTERA_SDCARD_CSD_C_SIZE_MULT_MASK0     0x80    /* top 1 bit */
   #define ALTERA_SDCARD_CSD_C_SIZE_MULT_RSHIFT0   7
   
   #define ALTERA_SDCARD_CSD_C_SIZE_MULT_BYTE1     6
   #define ALTERA_SDCARD_CSD_C_SIZE_MULT_MASK1     0x03    /* bottom 2 bits */
   #define ALTERA_SDCARD_CSD_C_SIZE_MULT_LSHIFT1   1
   
   /*
    * I/O register/buffer offsets, from Table 4.1.1 in the Altera University
    * Program SD Card IP Core specification.
    */
   #define ALTERA_SDCARD_OFF_RXTX_BUFFER   0       /* 512-byte I/O buffer */
   #define ALTERA_SDCARD_OFF_CID           512     /* 16-byte Card ID number */
   #define ALTERA_SDCARD_OFF_CSD           528     /* 16-byte Card Specific Data */
   #define ALTERA_SDCARD_OFF_OCR           544     /* Operating Conditions Reg */
   #define ALTERA_SDCARD_OFF_SR            548     /* SD Card Status Register */
   #define ALTERA_SDCARD_OFF_RCA           552     /* Relative Card Address Reg */
   #define ALTERA_SDCARD_OFF_CMD_ARG       556     /* Command Argument Register */
   #define ALTERA_SDCARD_OFF_CMD           560     /* Command Register */
   #define ALTERA_SDCARD_OFF_ASR           564     /* Auxiliary Status Register */
   #define ALTERA_SDCARD_OFF_RR1           568     /* Response R1 */
   
   /*
    * The Altera IP Core provides a 16-bit "Additional Status Register" (ASR)
    * beyond those described in the SD Card specification that captures IP Core
    * transaction state, such as whether the last command is in progress, the
    * card has been removed, etc.
    */
   #define ALTERA_SDCARD_ASR_CMDVALID      0x0001
   #define ALTERA_SDCARD_ASR_CARDPRESENT   0x0002
   #define ALTERA_SDCARD_ASR_CMDINPROGRESS 0x0004
   #define ALTERA_SDCARD_ASR_SRVALID       0x0008
   #define ALTERA_SDCARD_ASR_CMDTIMEOUT    0x0010
   #define ALTERA_SDCARD_ASR_CMDDATAERROR  0x0020
   
   /*
    * The Altera IP Core claims to provide a 16-bit "Response R1" register (RR1)
    * to provide more detailed error reporting when a read or write fails.
    *
    * XXXRW: The specification claims that this field is 16-bit, but then
    * proceeds to define values as though it is 32-bit.  In practice, 16-bit
    * seems more likely as the register is not 32-bit aligned.
    */
   #define ALTERA_SDCARD_RR1_INITPROCRUNNING       0x0100
   #define ALTERA_SDCARD_RR1_ERASEINTERRUPTED      0x0200
   #define ALTERA_SDCARD_RR1_ILLEGALCOMMAND        0x0400
   #define ALTERA_SDCARD_RR1_COMMANDCRCFAILED      0x0800
   #define ALTERA_SDCARD_RR1_ADDRESSMISALIGNED     0x1000
   #define ALTERA_SDCARD_RR1_ADDRBLOCKRANGE        0x2000
   
   /*
    * Not all RR1 values are "errors" per se -- check only for the ones that are
    * when performing error handling.
    */
   #define ALTERA_SDCARD_RR1_ERRORMASK                                           \
       (ALTERA_SDCARD_RR1_ERASEINTERRUPTED | ALTERA_SDCARD_RR1_ILLEGALCOMMAND |  \
       ALTERA_SDCARD_RR1_COMMANDCRCFAILED | ALTERA_SDCARD_RR1_ADDRESSMISALIGNED |\
       ALTERA_SDCARD_RR1_ADDRBLOCKRANGE)
   
   /*
    * Although SD Cards may have various sector sizes, the Altera IP Core
    * requires that I/O be done in 512-byte chunks.
    */
   #define ALTERA_SDCARD_SECTORSIZE        512
   
   /*
    * SD Card commands used in this driver.
    */
   #define ALTERA_SDCARD_CMD_SEND_RCA      0x03    /* Retrieve card RCA. */
   #define ALTERA_SDCARD_CMD_SEND_CSD      0x09    /* Retrieve CSD register. */
   #define ALTERA_SDCARD_CMD_SEND_CID      0x0A    /* Retrieve CID register. */
   #define ALTERA_SDCARD_CMD_READ_BLOCK    0x11    /* Read block from disk. */
   #define ALTERA_SDCARD_CMD_WRITE_BLOCK   0x18    /* Write block to disk. */
   
   /*
    * Functions exposed by the device driver core to newbus(9) bus attachment
    * implementations.
    */
   void    altera_sdcard_attach(struct altera_sdcard_softc *sc);
   void    altera_sdcard_detach(struct altera_sdcard_softc *sc);
   void    altera_sdcard_task(void *arg, int pending);
   
   /*
    * Functions exposed by the device driver core to the disk(9) front-end.
    */
   void    altera_sdcard_start(struct altera_sdcard_softc *sc);
   
   /*
    * Functions relating to the implementation of disk(9) KPIs for the SD Card
    * driver.
    */
   void    altera_sdcard_disk_insert(struct altera_sdcard_softc *sc);
   void    altera_sdcard_disk_remove(struct altera_sdcard_softc *sc);
   
   extern devclass_t       altera_sdcard_devclass;
   
   #endif  /* _DEV_ALTERA_SDCARD_H_ */

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