LXR qemu/include/hw/sd/sd.h

   1/*
   2 * SD Memory Card emulation.  Mostly correct for MMC too.
   3 *
   4 * Copyright (c) 2006 Andrzej Zaborowski  <balrog@zabor.org>
   5 *
   6 * Redistribution and use in source and binary forms, with or without
   7 * modification, are permitted provided that the following conditions
   8 * are met:
   9 *
  10 * 1. Redistributions of source code must retain the above copyright
  11 *    notice, this list of conditions and the following disclaimer.
  12 * 2. Redistributions in binary form must reproduce the above copyright
  13 *    notice, this list of conditions and the following disclaimer in
  14 *    the documentation and/or other materials provided with the
  15 *    distribution.
  16 *
  17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
  18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  19 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  20 * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
  21 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  24 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  25 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 */
  29
  30#ifndef HW_SD_H
  31#define HW_SD_H
  32
  33#include "hw/qdev.h"
  34
  35#define OUT_OF_RANGE            (1 << 31)
  36#define ADDRESS_ERROR           (1 << 30)
  37#define BLOCK_LEN_ERROR         (1 << 29)
  38#define ERASE_SEQ_ERROR         (1 << 28)
  39#define ERASE_PARAM             (1 << 27)
  40#define WP_VIOLATION            (1 << 26)
  41#define CARD_IS_LOCKED          (1 << 25)
  42#define LOCK_UNLOCK_FAILED      (1 << 24)
  43#define COM_CRC_ERROR           (1 << 23)
  44#define ILLEGAL_COMMAND         (1 << 22)
  45#define CARD_ECC_FAILED         (1 << 21)
  46#define CC_ERROR                (1 << 20)
  47#define SD_ERROR                (1 << 19)
  48#define CID_CSD_OVERWRITE       (1 << 16)
  49#define WP_ERASE_SKIP           (1 << 15)
  50#define CARD_ECC_DISABLED       (1 << 14)
  51#define ERASE_RESET             (1 << 13)
  52#define CURRENT_STATE           (7 << 9)
  53#define READY_FOR_DATA          (1 << 8)
  54#define SWTICH_ERROR        (1 << 7)
  55#define APP_CMD                 (1 << 5)
  56#define AKE_SEQ_ERROR           (1 << 3)
  57#define OCR_CCS_BITN        30
  58
  59#define EXCSD_BUS_WIDTH_OFFSET 183
  60#define BUS_WIDTH_8_MASK    0x4
  61#define BUS_WIDTH_4_MASK    0x2
  62
  63#define SD_TUNING_BLOCK_SIZE    64
  64#define MMC_TUNING_BLOCK_SIZE   128
  65
  66typedef enum {
  67    sd_none = -1,
  68    sd_bc = 0,  /* broadcast -- no response */
  69    sd_bcr,     /* broadcast with response */
  70    sd_ac,      /* addressed -- no data transfer */
  71    sd_adtc,    /* addressed with data transfer */
  72} sd_cmd_type_t;
  73
  74typedef struct {
  75    uint8_t cmd;
  76    uint32_t arg;
  77    uint8_t crc;
  78} SDRequest;
  79
  80#define SD_VOLTAGE_33 33
  81#define SD_VOLTAGE_18 18
  82
  83typedef struct SDState SDState;
  84typedef struct SDBus SDBus;
  85
  86#define TYPE_SD_CARD "sd-card"
  87#define SD_CARD(obj) OBJECT_CHECK(SDState, (obj), TYPE_SD_CARD)
  88#define SD_CARD_CLASS(klass) \
  89    OBJECT_CLASS_CHECK(SDCardClass, (klass), TYPE_SD_CARD)
  90#define SD_CARD_GET_CLASS(obj) \
  91    OBJECT_GET_CLASS(SDCardClass, (obj), TYPE_SD_CARD)
  92
  93typedef struct {
  94    /*< private >*/
  95    DeviceClass parent_class;
  96    /*< public >*/
  97
  98    uint8_t (*get_dat_lines)(SDState *sd);
  99    bool (*get_cmd_line)(SDState *sd);
 100    void (*set_voltage)(SDState *sd, int v);
 101    int (*do_command)(SDState *sd, SDRequest *req, uint8_t *response);
 102    void (*write_data)(SDState *sd, uint8_t value);
 103    uint8_t (*read_data)(SDState *sd);
 104    bool (*data_ready)(SDState *sd);
 105    void (*enable)(SDState *sd, bool enable);
 106    bool (*get_inserted)(SDState *sd);
 107    bool (*get_readonly)(SDState *sd);
 108} SDCardClass;
 109
 110#define TYPE_SD_BUS "sd-bus"
 111#define SD_BUS(obj) OBJECT_CHECK(SDBus, (obj), TYPE_SD_BUS)
 112#define SD_BUS_CLASS(klass) OBJECT_CLASS_CHECK(SDBusClass, (klass), TYPE_SD_BUS)
 113#define SD_BUS_GET_CLASS(obj) OBJECT_GET_CLASS(SDBusClass, (obj), TYPE_SD_BUS)
 114
 115struct SDBus {
 116    BusState qbus;
 117};
 118
 119typedef struct {
 120    /*< private >*/
 121    BusClass parent_class;
 122    /*< public >*/
 123
 124    /* These methods are called by the SD device to notify the controller
 125     * when the card insertion or readonly status changes
 126     */
 127    void (*set_inserted)(DeviceState *dev, bool inserted);
 128    void (*set_readonly)(DeviceState *dev, bool readonly);
 129} SDBusClass;
 130
 131/* Legacy functions to be used only by non-qdevified callers */
 132SDState *sd_init(BlockBackend *bs, bool is_spi);
 133SDState *mmc_init(BlockBackend *bs);
 134
 135int sd_do_command(SDState *sd, SDRequest *req,
 136                  uint8_t *response);
 137void sd_write_data(SDState *sd, uint8_t value);
 138uint8_t sd_read_data(SDState *sd);
 139void sd_set_cb(SDState *sd, qemu_irq readonly, qemu_irq insert);
 140bool sd_data_ready(SDState *sd);
 141/* sd_enable should not be used -- it is only used on the nseries boards,
 142 * where it is part of a broken implementation of the MMC card slot switch
 143 * (there should be two card slots which are multiplexed to a single MMC
 144 * controller, but instead we model it with one card and controller and
 145 * disable the card when the second slot is selected, so it looks like the
 146 * second slot is always empty).
 147 */
 148void sd_enable(SDState *sd, bool enable);
 149uint8_t sd_get_dat_lines(SDState *sd);
 150bool sd_get_cmd_line(SDState *sd);
 151void sd_set_voltage(SDState *sd, int v);
 152
 153/* Functions to be used by qdevified callers (working via
 154 * an SDBus rather than directly with SDState)
 155 */
 156uint8_t sdbus_get_dat_lines(SDBus *sdbus);
 157bool sdbus_get_cmd_line(SDBus *sdbus);
 158void sdbus_set_voltage(SDBus *sdbus, int v);
 159int sdbus_do_command(SDBus *sd, SDRequest *req, uint8_t *response);
 160void sdbus_write_data(SDBus *sd, uint8_t value);
 161uint8_t sdbus_read_data(SDBus *sd);
 162bool sdbus_data_ready(SDBus *sd);
 163bool sdbus_get_inserted(SDBus *sd);
 164bool sdbus_get_readonly(SDBus *sd);
 165/**
 166 * sdbus_reparent_card: Reparent an SD card from one controller to another
 167 * @from: controller bus to remove card from
 168 * @to: controller bus to move card to
 169 *
 170 * Reparent an SD card, effectively unplugging it from one controller
 171 * and inserting it into another. This is useful for SoCs like the
 172 * bcm2835 which have two SD controllers and connect a single SD card
 173 * to them, selected by the guest reprogramming GPIO line routing.
 174 */
 175void sdbus_reparent_card(SDBus *from, SDBus *to);
 176
 177/* Functions to be used by SD devices to report back to qdevified controllers */
 178void sdbus_set_inserted(SDBus *sd, bool inserted);
 179void sdbus_set_readonly(SDBus *sd, bool inserted);
 180
 181#endif /* HW_SD_H */
 182