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mmcspi.c
pkelsey (Patrick Kelsey)
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Apr 3 2025, 10:05 PM
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mmcspi.c
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/*-
* Copyright (c) 2012 Patrick Kelsey. All rights reserved.
* Copyright (c) 2025 Ruslan Bukin <br@bsdpad.com>
*
* 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 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 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.
*
* Portions of this software may have been developed with reference to
* the SD Simplified Specification. The following disclaimer may apply:
*
* The following conditions apply to the release of the simplified
* specification ("Simplified Specification") by the SD Card Association and
* the SD Group. The Simplified Specification is a subset of the complete SD
* Specification which is owned by the SD Card Association and the SD
* Group. This Simplified Specification is provided on a non-confidential
* basis subject to the disclaimers below. Any implementation of the
* Simplified Specification may require a license from the SD Card
* Association, SD Group, SD-3C LLC or other third parties.
*
* Disclaimers:
*
* The information contained in the Simplified Specification is presented only
* as a standard specification for SD Cards and SD Host/Ancillary products and
* is provided "AS-IS" without any representations or warranties of any
* kind. No responsibility is assumed by the SD Group, SD-3C LLC or the SD
* Card Association for any damages, any infringements of patents or other
* right of the SD Group, SD-3C LLC, the SD Card Association or any third
* parties, which may result from its use. No license is granted by
* implication, estoppel or otherwise under any patent or other rights of the
* SD Group, SD-3C LLC, the SD Card Association or any third party. Nothing
* herein shall be construed as an obligation by the SD Group, the SD-3C LLC
* or the SD Card Association to disclose or distribute any technical
* information, know-how or other confidential information to any third party.
*
*
* CRC routines adapted from public domain code written by Lammert Bies.
*
*
* This is an implementation of mmcbr that communicates with SD/MMC cards in
* SPI mode via spibus_if. In order to minimize changes to the existing
* MMC/SD stack (and allow for maximal reuse of the same), the behavior of
* the SD-bus command set is emulated as much as possible, where required.
*
* The SPI bus ownership behavior is to acquire the SPI bus for the entire
* duration that the MMC host is acquired.
*
* CRC checking is enabled by default, but can be disabled at runtime
* per-card via sysctl (e.g. sysctl dev.mmcspi.0.use_crc=0).
*
* Considered, but not implemented:
* - Card presence detection
* - Card power control
* - Detection of lock switch state on cards that have them
* - Yielding the CPU during long card busy cycles
*
* Originally developed and tested using a MicroTik RouterBOARD RB450G and
* 31 microSD cards available circa 2012.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <dev/mmc/bridge.h>
#include <dev/mmc/mmcreg.h>
#include <dev/mmc/mmcbrvar.h>
#include <dev/spibus/spi.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "mmcbr_if.h"
#include "spibus_if.h"
#define MMCSPI_RETRIES 3
#define MMCSPI_TIMEOUT_SEC 3
#define MMCSPI_MAX_RSP_LEN 5 /* max length of an Rn response */
#define MMCSPI_OCR_LEN 4
#define MMCSPI_DATA_BLOCK_LEN 512
#define MMCSPI_DATA_CRC_LEN 2
#define MMCSPI_POLL_LEN 8 /* amount to read when searching */
#define MMCSPI_R1_MASK 0x80 /* mask used to search for R1 tokens */
#define MMCSPI_R1_VALUE 0x00 /* value used to search for R1 tokens */
#define MMCSPI_DR_MASK 0x11 /* mask used to search for data resp tokens */
#define MMCSPI_DR_VALUE 0x01 /* value used to search for data resp tokens */
#define MMCSPI_DR_ERR_MASK 0x0e
#define MMCSPI_DR_ERR_NONE 0x04
#define MMCSPI_DR_ERR_CRC 0x0a
#define MMCSPI_DR_ERR_WRITE 0x0c
#define MMCSPI_TOKEN_SB 0xfe /* start block token for read single,
read multi, and write single */
#define MMCSPI_TOKEN_SB_WM 0xfc /* start block token for write multi */
#define MMCSPI_TOKEN_ST 0xfd /* stop transmission token */
#define MMCSPI_IS_DE_TOKEN(x) (0 == ((x) & 0xf0)) /* detector for data
error token */
#define MMCSPI_R1_IDLE 0x01
#define MMCSPI_R1_ERASE_RST 0x02
#define MMCSPI_R1_ILL_CMD 0x04
#define MMCSPI_R1_CRC_ERR 0x08
#define MMCSPI_R1_ERASE_ERR 0x10
#define MMCSPI_R1_ADDR_ERR 0x20
#define MMCSPI_R1_PARAM_ERR 0x40
#define MMCSPI_R1_ERR_MASK (MMCSPI_R1_PARAM_ERR | MMCSPI_R1_ADDR_ERR | \
MMCSPI_R1_ERASE_ERR | MMCSPI_R1_CRC_ERR | \
MMCSPI_R1_ILL_CMD)
#define MMCSPI_R2_LOCKED 0x01
#define MMCSPI_R2_WP_ER_LCK 0x02
#define MMCSPI_R2_ERR 0x04
#define MMCSPI_R2_CC_ERR 0x08
#define MMCSPI_R2_ECC_FAIL 0x10
#define MMCSPI_R2_WP_VIOLATE 0x20
#define MMCSPI_R2_ERASE_PARAM 0x40
#define MMCSPI_R2_OOR_CSD_OW 0x80
/* commands that only apply to the SPI interface */
#define MMCSPI_READ_OCR 58
#define MMCSPI_CRC_ON_OFF 59
static struct ofw_compat_data compat_data[] = {
{ "mmc-spi-slot", 1 },
{ NULL, 0 }
};
struct mmcspi_command {
struct mmc_command *mmc_cmd; /* command passed from mmc layer */
uint32_t opcode; /* possibly translated opcode */
uint32_t arg; /* possibly translated arg */
uint32_t flags; /* possibly translated flags */
uint32_t retries; /* possibly translated retry count */
struct mmc_data *data; /* possibly redirected data segment */
unsigned int error_mask; /* R1 errors check mask */
unsigned char use_crc; /* do crc checking for this command */
unsigned char rsp_type; /* SPI response type of this command */
#define MMCSPI_RSP_R1 0
#define MMCSPI_RSP_R1B 1
#define MMCSPI_RSP_R2 2
#define MMCSPI_RSP_R3 3
#define MMCSPI_RSP_R7 4
unsigned char rsp_len; /* response len of this command */
unsigned char mmc_rsp_type; /* MMC reponse type to translate to */
#define MMCSPI_TO_MMC_RSP_NONE 0
#define MMCSPI_TO_MMC_RSP_R1 1
#define MMCSPI_TO_MMC_RSP_R1B 2
#define MMCSPI_TO_MMC_RSP_R2 3
#define MMCSPI_TO_MMC_RSP_R3 4
#define MMCSPI_TO_MMC_RSP_R6 5
#define MMCSPI_TO_MMC_RSP_R7 6
struct mmc_data ldata; /* local read data */
};
struct mmcspi_slot {
struct mmcspi_softc *sc; /* back pointer to parent bridge */
device_t dev; /* mmc device for slot */
boolean_t bus_busy; /* host has been acquired */
struct mmc_host host; /* host parameters */
struct mtx mtx; /* slot mutex */
uint8_t last_ocr[MMCSPI_OCR_LEN]; /* ocr retrieved after CMD8 */
uint32_t last_opcode; /* last opcode requested by mmc layer */
uint32_t last_flags; /* last flags requested by mmc layer */
unsigned int crc_enabled; /* crc checking is enabled */
unsigned int crc_init_done; /* whether the initial crc setting has
been sent to the card */
#define MMCSPI_MAX_LDATA_LEN 16
uint8_t ldata_buf[MMCSPI_MAX_LDATA_LEN];
};
struct mmcspi_softc {
device_t dev; /* this mmc bridge device */
device_t busdev;
struct mmcspi_slot slot;
unsigned int use_crc; /* command CRC checking */
};
#if defined(MMCSPI_ENABLE_DEBUG_FUNCS)
static void mmcspi_dump_data(device_t dev, const char *label, uint8_t *data,
unsigned int len);
static void mmcspi_dump_spi_bus(device_t dev, unsigned int len);
#endif
#define MMCSPI_LOCK_SLOT(_slot) mtx_lock(&(_slot)->mtx)
#define MMCSPI_UNLOCK_SLOT(_slot) mtx_unlock(&(_slot)->mtx)
#define MMCSPI_SLOT_LOCK_INIT(_slot) mtx_init(&(_slot)->mtx, \
"SD slot mtx", "mmcspi", MTX_DEF)
#define MMCSPI_SLOT_LOCK_DESTROY(_slot) mtx_destroy(&(_slot)->mtx);
#define MMCSPI_ASSERT_SLOT_LOCKED(_slot) mtx_assert(&(_slot)->mtx, \
MA_OWNED);
#define MMCSPI_ASSERT_SLOT_UNLOCKED(_slot) mtx_assert(&(_slot)->mtx, \
MA_NOTOWNED);
#define TRACE_ZONE_ENABLED(zone) (trace_zone_mask & TRACE_ZONE_##zone)
#define TRACE_ENTER(dev) \
if (TRACE_ZONE_ENABLED(ENTER)) { \
device_printf(dev, "%s: enter\n", __func__); \
}
#define TRACE_EXIT(dev) \
if (TRACE_ZONE_ENABLED(EXIT)) { \
device_printf(dev, "%s: exit\n", __func__); \
}
#define TRACE(dev, zone, ...) \
if (TRACE_ZONE_ENABLED(zone)) { \
device_printf(dev, __VA_ARGS__); \
}
#define TRACE_ZONE_ENTER (1ul << 0) /* function entrance */
#define TRACE_ZONE_EXIT (1ul << 1) /* function exit */
#define TRACE_ZONE_ACTION (1ul << 2) /* for narrating major actions taken */
#define TRACE_ZONE_RESULT (1ul << 3) /* for narrating results of actions */
#define TRACE_ZONE_ERROR (1ul << 4) /* for reporting errors */
#define TRACE_ZONE_DATA (1ul << 5) /* for dumping bus data */
#define TRACE_ZONE_DETAILS (1ul << 6) /* for narrating minor actions/results */
#define TRACE_ZONE_NONE 0
#define TRACE_ZONE_ALL 0xffffffff
#define CRC7_INITIAL 0x00
#define CRC16_INITIAL 0x0000
SYSCTL_NODE(_hw, OID_AUTO, mmcspi, CTLFLAG_RD, 0, "mmcspi driver");
static unsigned int trace_zone_mask = TRACE_ZONE_ERROR;
static uint8_t crc7tab[256];
static uint16_t crc16tab[256];
static uint8_t onesbuf[MMCSPI_DATA_BLOCK_LEN]; /* for driving the tx line
when receiving */
static uint8_t junkbuf[MMCSPI_DATA_BLOCK_LEN]; /* for receiving data when
transmitting */
static uint8_t
update_crc7(uint8_t crc, uint8_t *buf, unsigned int len)
{
uint8_t tmp;
int i;
for (i = 0; i < len; i++) {
tmp = (crc << 1) ^ buf[i];
crc = crc7tab[tmp];
}
return (crc);
}
static uint16_t
update_crc16(uint16_t crc, uint8_t *buf, unsigned int len)
{
uint16_t tmp, c16;
int i;
for (i = 0; i < len; i++) {
c16 = 0x00ff & (uint16_t)buf[i];
tmp = (crc >> 8) ^ c16;
crc = (crc << 8) ^ crc16tab[tmp];
}
return (crc);
}
static void
init_crc7tab(void)
{
#define P_CRC7 0x89
int i, j;
uint8_t crc, c;
for (i = 0; i < 256; i++) {
c = (uint8_t)i;
crc = (c & 0x80) ? c ^ P_CRC7 : c;
for (j=1; j<8; j++) {
crc = crc << 1;
if (crc & 0x80)
crc = crc ^ P_CRC7;
}
crc7tab[i] = crc;
}
}
static void
init_crc16tab(void)
{
#define P_CCITT 0x1021
int i, j;
uint16_t crc, c;
for (i = 0; i < 256; i++) {
crc = 0;
c = ((uint16_t) i) << 8;
for (j=0; j<8; j++) {
if ((crc ^ c) & 0x8000) crc = ( crc << 1 ) ^ P_CCITT;
else crc = crc << 1;
c = c << 1;
}
crc16tab[i] = crc;
}
}
static void
mmcspi_slot_init(device_t brdev, struct mmcspi_slot *slot)
{
struct mmcspi_softc *sc;
TRACE_ENTER(brdev);
sc = device_get_softc(brdev);
slot->sc = sc;
slot->dev = NULL; /* will get real value when card is added */
slot->bus_busy = false;
slot->host.f_min = 100000; /* this should be as low as we need to go
for any card */
slot->host.caps = 0;
/* SPI mode requires 3.3V operation */
slot->host.host_ocr = MMC_OCR_320_330 | MMC_OCR_330_340;
MMCSPI_SLOT_LOCK_INIT(slot);
TRACE_EXIT(brdev);
}
static void
mmcspi_slot_fini(device_t brdev, struct mmcspi_slot *slot)
{
TRACE_ENTER(brdev);
MMCSPI_SLOT_LOCK_DESTROY(slot);
TRACE_EXIT(brdev);
}
static void
mmcspi_card_add(struct mmcspi_slot *slot)
{
device_t brdev;
device_t child;
brdev = slot->sc->dev;
TRACE_ENTER(brdev);
child = device_add_child(brdev, "mmc", DEVICE_UNIT_ANY);
MMCSPI_LOCK_SLOT(slot);
slot->dev = child;
device_set_ivars(slot->dev, slot);
MMCSPI_UNLOCK_SLOT(slot);
device_probe_and_attach(slot->dev);
TRACE_EXIT(brdev);
}
static void
mmcspi_card_delete(struct mmcspi_slot *slot)
{
device_t brdev;
device_t dev;
brdev = slot->sc->dev;
TRACE_ENTER(brdev);
MMCSPI_LOCK_SLOT(slot);
dev = slot->dev;
slot->dev = NULL;
MMCSPI_UNLOCK_SLOT(slot);
device_delete_child(brdev, dev);
TRACE_EXIT(brdev);
}
static int
mmcspi_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
device_set_desc(dev, "MMC SPI mode controller");
return (BUS_PROBE_DEFAULT);
}
static int
mmcspi_attach(device_t dev)
{
struct mmcspi_softc *sc;
struct sysctl_ctx_list *ctx;
struct sysctl_oid *tree;
struct sysctl_oid_list *child;
TRACE_ENTER(dev);
sc = device_get_softc(dev);
ctx = device_get_sysctl_ctx(dev);
tree = device_get_sysctl_tree(dev);
child = SYSCTL_CHILDREN(tree);
sc->dev = dev;
sc->busdev = device_get_parent(dev);
sc->use_crc = 1;
SYSCTL_ADD_UINT(ctx, child, OID_AUTO, "use_crc", CTLFLAG_RW,
&sc->use_crc, sizeof(sc->use_crc), "Enable/disable crc checking");
SYSCTL_ADD_UINT(ctx, child, OID_AUTO, "trace_mask", CTLFLAG_RW,
&trace_zone_mask, sizeof(trace_zone_mask), "Bitmask for adjusting "
"trace messages");
mmcspi_slot_init(dev, &sc->slot);
/* XXX trigger this from card insert detection */
mmcspi_card_add(&sc->slot);
TRACE_EXIT(dev);
return (0);
}
static int
mmcspi_detach(device_t dev)
{
struct mmcspi_softc *sc;
TRACE_ENTER(dev);
sc = device_get_softc(dev);
/* XXX trigger this from card removal detection */
mmcspi_card_delete(&sc->slot);
mmcspi_slot_fini(dev, &sc->slot);
TRACE_EXIT(dev);
return (0);
}
static int
mmcspi_suspend(device_t dev)
{
int err;
TRACE_ENTER(dev);
err = bus_generic_suspend(dev);
if (err) {
TRACE_EXIT(dev);
return (err);
}
TRACE_EXIT(dev);
return (0);
}
static int
mmcspi_resume(device_t dev)
{
int err;
TRACE_ENTER(dev);
err = bus_generic_resume(dev);
if (err) {
TRACE_EXIT(dev);
return (err);
}
TRACE_EXIT(dev);
return (0);
}
static int
mmcspi_read_ivar(device_t bus, device_t child, int which, uintptr_t *result)
{
struct mmcspi_slot *slot;
TRACE_ENTER(bus);
slot = device_get_ivars(child);
switch (which) {
case MMCBR_IVAR_BUS_TYPE:
*result = bus_type_spi;
break;
case MMCBR_IVAR_BUS_MODE:
*result = slot->host.ios.bus_mode;
break;
case MMCBR_IVAR_BUS_WIDTH:
*result = slot->host.ios.bus_width;
break;
case MMCBR_IVAR_CHIP_SELECT:
*result = slot->host.ios.chip_select;
break;
case MMCBR_IVAR_CLOCK:
*result = slot->host.ios.clock;
break;
case MMCBR_IVAR_F_MIN:
*result = slot->host.f_min;
break;
case MMCBR_IVAR_F_MAX:
*result = slot->host.f_max;
break;
case MMCBR_IVAR_HOST_OCR:
*result = slot->host.host_ocr;
break;
case MMCBR_IVAR_MODE:
*result = slot->host.mode;
break;
case MMCBR_IVAR_OCR:
*result = slot->host.ocr;
break;
case MMCBR_IVAR_POWER_MODE:
*result = slot->host.ios.power_mode;
break;
case MMCBR_IVAR_VDD:
*result = slot->host.ios.vdd;
break;
case MMCBR_IVAR_VCCQ:
*result = slot->host.ios.vccq;
break;
case MMCBR_IVAR_CAPS:
*result = slot->host.caps;
break;
case MMCBR_IVAR_TIMING:
*result = slot->host.ios.timing;
break;
case MMCBR_IVAR_MAX_DATA:
/* seems reasonable, not dictated by anything */
*result = 64 * 1024;
break;
default:
return (EINVAL);
}
TRACE_EXIT(bus);
return (0);
}
static int
mmcspi_write_ivar(device_t bus, device_t child, int which, uintptr_t value)
{
struct mmcspi_slot *slot;
TRACE_ENTER(bus);
slot = device_get_ivars(child);
switch (which) {
default:
return (EINVAL);
case MMCBR_IVAR_BUS_MODE:
slot->host.ios.bus_mode = value;
break;
case MMCBR_IVAR_BUS_WIDTH:
slot->host.ios.bus_width = value;
break;
case MMCBR_IVAR_CLOCK:
slot->host.ios.clock = value;
break;
case MMCBR_IVAR_CHIP_SELECT:
slot->host.ios.chip_select = value;
break;
case MMCBR_IVAR_MODE:
slot->host.mode = value;
break;
case MMCBR_IVAR_OCR:
slot->host.ocr = value;
break;
case MMCBR_IVAR_POWER_MODE:
slot->host.ios.power_mode = value;
break;
case MMCBR_IVAR_VDD:
slot->host.ios.vdd = value;
break;
case MMCBR_IVAR_VCCQ:
slot->host.ios.vccq = value;
break;
case MMCBR_IVAR_TIMING:
slot->host.ios.timing = value;
break;
case MMCBR_IVAR_BUS_TYPE:
case MMCBR_IVAR_CAPS:
case MMCBR_IVAR_HOST_OCR:
case MMCBR_IVAR_F_MIN:
case MMCBR_IVAR_F_MAX:
case MMCBR_IVAR_MAX_DATA:
return (EINVAL);
}
TRACE_EXIT(bus);
return (0);
}
static unsigned int
mmcspi_do_spi_read(device_t dev, uint8_t *data, unsigned int len)
{
struct spi_command spi_cmd;
struct mmcspi_softc *sc;
int err;
TRACE_ENTER(dev);
sc = device_get_softc(dev);
spi_cmd.tx_cmd = onesbuf;
spi_cmd.rx_cmd = data;
spi_cmd.tx_cmd_sz = len;
spi_cmd.rx_cmd_sz = len;
spi_cmd.tx_data = NULL;
spi_cmd.rx_data = NULL;
spi_cmd.tx_data_sz = 0;
spi_cmd.rx_data_sz = 0;
err = SPIBUS_TRANSFER(sc->busdev, sc->dev, &spi_cmd);
#ifdef DEBUG_RX
int i;
if (err == 0) {
printf("rx val: ");
for (i = 0; i < len; i++)
printf("%x ", data[i]);
printf("\n");
}
#endif
TRACE_EXIT(dev);
return (err ? MMC_ERR_FAILED : MMC_ERR_NONE);
}
static unsigned int
mmcspi_do_spi_write(device_t dev, uint8_t *cmd, unsigned int cmdlen,
uint8_t *data, unsigned int datalen)
{
struct mmcspi_softc *sc;
struct spi_command spi_cmd;
int err;
TRACE_ENTER(dev);
sc = device_get_softc(dev);
spi_cmd.tx_cmd = cmd;
spi_cmd.rx_cmd = junkbuf;
spi_cmd.tx_cmd_sz = cmdlen;
spi_cmd.rx_cmd_sz = cmdlen;
spi_cmd.tx_data = data;
spi_cmd.rx_data = junkbuf;
spi_cmd.tx_data_sz = datalen;
spi_cmd.rx_data_sz = datalen;
err = SPIBUS_TRANSFER(sc->busdev, sc->dev, &spi_cmd);
TRACE_EXIT(dev);
return (err ? MMC_ERR_FAILED : MMC_ERR_NONE);
}
static unsigned int
mmcspi_wait_for_not_busy(device_t dev)
{
unsigned int busy_length;
uint8_t pollbuf[MMCSPI_POLL_LEN];
struct bintime start, elapsed;
unsigned int err;
int i;
busy_length = 0;
TRACE_ENTER(dev);
TRACE(dev, ACTION, "waiting for not busy\n");
getbintime(&start);
do {
TRACE(dev, DETAILS, "looking for end of busy\n");
err = mmcspi_do_spi_read(dev, pollbuf, MMCSPI_POLL_LEN);
if (MMC_ERR_NONE != err) {
TRACE(dev, ERROR, "spi read failed\n");
TRACE_EXIT(dev);
return (err);
}
for (i = 0; i < MMCSPI_POLL_LEN; i++) {
if (pollbuf[i] != 0x00) {
TRACE(dev, DETAILS,
"end of busy found at %d\n", i);
break;
}
busy_length++;
}
getbintime(&elapsed);
bintime_sub(&elapsed, &start);
if (elapsed.sec > MMCSPI_TIMEOUT_SEC) {
TRACE(dev, ERROR, "card busy timeout\n");
return (MMC_ERR_TIMEOUT);
}
} while (MMCSPI_POLL_LEN == i);
TRACE(dev, RESULT, "busy for %u byte slots\n", busy_length);
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static int
mmcspi_update_ios(device_t brdev, device_t reqdev)
{
struct mmcspi_softc *sc;
struct mmcspi_slot *slot;
struct spi_command spi_cmd;
TRACE_ENTER(brdev);
sc = device_get_softc(brdev);
slot = device_get_ivars(reqdev);
if (power_up == slot->host.ios.power_mode) {
/*
* This sequence provides the initialization steps required
* by the spec after card power is applied, but before any
* commands are issued. These operations are harmless if
* applied at any other time (after a warm reset, for
* example).
*/
/*
* XXX Power-on portion of implementation of card power
* control should go here. Should probably include a power
* off first to ensure card is fully reset from any previous
* state.
*/
/*
* Make sure power to card has ramped up. The spec requires
* power to ramp up in 35ms or less.
*/
DELAY(35000);
/*
* Provide at least 74 clocks with CS and MOSI high that the
* spec requires after card power stabilizes.
*/
spi_cmd.tx_cmd = onesbuf;
spi_cmd.tx_cmd_sz = 10;
spi_cmd.rx_cmd = junkbuf;
spi_cmd.rx_cmd_sz = 10;
spi_cmd.tx_data = NULL;
spi_cmd.rx_data = NULL;
spi_cmd.tx_data_sz = 0;
spi_cmd.rx_data_sz = 0;
SPIBUS_TRANSFER(sc->busdev, sc->dev, &spi_cmd);
/*
* Perhaps this was a warm reset and the card is in the
* middle of a long operation.
*/
mmcspi_wait_for_not_busy(brdev);
slot->last_opcode = 0xffffffff;
slot->last_flags = 0;
memset(slot->last_ocr, 0, MMCSPI_OCR_LEN);
slot->crc_enabled = 0;
slot->crc_init_done = 0;
}
if (power_off == slot->host.ios.power_mode) {
/*
* XXX Power-off portion of implementation of card power
* control should go here.
*/
}
TRACE_EXIT(brdev);
return (0);
}
static unsigned int
mmcspi_shift_copy(uint8_t *dest, uint8_t *src, unsigned int dest_len,
unsigned int shift)
{
unsigned int i;
if (0 == shift)
memcpy(dest, src, dest_len);
else {
for (i = 0; i < dest_len; i++) {
dest[i] =
(src[i] << shift) |
(src[i + 1] >> (8 - shift));
}
}
return (dest_len);
}
static unsigned int
mmcspi_get_response_token(device_t dev, uint8_t mask, uint8_t value,
unsigned int len, unsigned int has_busy, uint8_t *rspbuf)
{
uint8_t pollbuf[2 * MMCSPI_MAX_RSP_LEN];
struct bintime start, elapsed;
boolean_t found;
unsigned int err;
unsigned int offset;
unsigned int shift = 0;
unsigned int remaining;
uint16_t search_space;
uint16_t search_mask;
uint16_t search_value;
int i;
TRACE_ENTER(dev);
/*
* This loop searches data clocked out of the card for a response
* token matching the given mask and value. It will locate tokens
* that are not byte-aligned, as some cards send non-byte-aligned
* response tokens in some situations. For example, the following
* card consistently sends an unaligned response token to the stop
* command used to terminate multi-block reads:
*
* Transcend 2GB SDSC card, cid:
* mid=0x1b oid=0x534d pnm="00000" prv=1.0 mdt=00.2000
*/
offset = 0;
found = false;
getbintime(&start);
do {
TRACE(dev, DETAILS, "looking for response token with "
"mask 0x%02x, value 0x%02x\n", mask, value);
err = mmcspi_do_spi_read(dev, &pollbuf[offset], len);
if (MMC_ERR_NONE != err) {
TRACE(dev, ERROR, "spi read of resp token failed\n");
TRACE_EXIT(dev);
return (err);
}
for (i = 0; i < len + offset; i++) {
if ((pollbuf[i] & mask) == value) {
TRACE(dev, DETAILS, "response token found at "
"%d (0x%02x)\n", i, pollbuf[i]);
shift = 0;
found = true;
break;
} else if (i < len + offset - 1) {
/*
* Not the last byte in the buffer, so check
* for a non-aligned response.
*/
search_space = ((uint16_t)pollbuf[i] << 8) |
pollbuf[i + 1];
search_mask = (uint16_t)mask << 8;
search_value = (uint16_t)value << 8;
TRACE(dev, DETAILS, "search: space=0x%04x "
" mask=0x%04x val=0x%04x\n", search_space,
search_mask, search_value);
for (shift = 1; shift < 8; shift++) {
search_space <<= 1;
if ((search_space & search_mask) ==
search_value) {
found = true;
TRACE(dev, DETAILS, "Found mat"
"ch at shift %u\n", shift);
break;
}
}
if (shift < 8)
break;
} else {
/*
* Move the last byte to the first position
* and go 'round again.
*/
pollbuf[0] = pollbuf[i];
}
}
if (!found) {
offset = 1;
getbintime(&elapsed);
bintime_sub(&elapsed, &start);
if (elapsed.sec > MMCSPI_TIMEOUT_SEC) {
TRACE(dev, ERROR, "timeout while looking for "
"response token\n");
return (MMC_ERR_TIMEOUT);
}
}
} while (!found);
/*
* Note that if i == 0 and offset == 1, shift is always greater than
* zero.
*/
remaining = i - offset + (shift ? 1 : 0);
TRACE(dev, DETAILS, "len=%u i=%u rem=%u shift=%u\n",
len, i, remaining, shift);
if (remaining) {
err = mmcspi_do_spi_read(dev, &pollbuf[len + offset],
remaining);
if (MMC_ERR_NONE != err) {
TRACE(dev, ERROR, "spi read of remainder of response "
"token failed\n");
TRACE_EXIT(dev);
return (err);
}
}
mmcspi_shift_copy(rspbuf, &pollbuf[i], len, shift);
if (TRACE_ZONE_ENABLED(RESULT)) {
TRACE(dev, RESULT, "response =");
for (i = 0; i < len; i++)
printf(" 0x%02x", rspbuf[i]);
printf("\n");
}
if (has_busy) {
err = mmcspi_wait_for_not_busy(dev);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
}
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_set_up_command(device_t dev, struct mmcspi_command *mmcspi_cmd,
struct mmc_command *mmc_cmd)
{
struct mmcspi_softc *sc;
struct mmcspi_slot *slot;
uint32_t opcode;
uint32_t arg;
uint32_t flags;
uint32_t retries;
unsigned char rsp_type;
unsigned char rsp_len;
unsigned char mmc_rsp_type;
unsigned int ldata_len = 0;
unsigned int use_crc;
sc = device_get_softc(dev);
slot = &sc->slot;
use_crc = slot->crc_enabled;
opcode = mmc_cmd->opcode;
arg = mmc_cmd->arg;
flags = mmc_cmd->flags;
retries = mmc_cmd->retries;
if (flags & MMC_CMD_IS_APP) {
switch (opcode) {
case ACMD_SD_STATUS:
rsp_type = MMCSPI_RSP_R2;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R1;
break;
case ACMD_SEND_NUM_WR_BLOCKS:
case ACMD_SET_WR_BLK_ERASE_COUNT:
case ACMD_SET_CLR_CARD_DETECT:
case ACMD_SEND_SCR:
rsp_type = MMCSPI_RSP_R1;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R1;
break;
case ACMD_SD_SEND_OP_COND:
/* only HCS bit is valid in spi mode */
arg &= 0x40000000;
rsp_type = MMCSPI_RSP_R1;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R3;
break;
default:
TRACE(dev, ERROR, "Invalid app command opcode %u\n",
opcode);
return (MMC_ERR_INVALID);
}
} else {
switch (opcode) {
case MMC_GO_IDLE_STATE:
use_crc = 1;
rsp_type = MMCSPI_RSP_R1;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_NONE;
break;
case MMC_SEND_OP_COND:
case MMC_SWITCH_FUNC: /* also SD_SWITCH_FUNC */
case MMC_SET_BLOCKLEN:
case MMC_READ_SINGLE_BLOCK:
case MMC_READ_MULTIPLE_BLOCK:
case MMC_WRITE_BLOCK:
case MMC_WRITE_MULTIPLE_BLOCK:
case MMC_PROGRAM_CSD:
case MMC_SEND_WRITE_PROT:
case SD_ERASE_WR_BLK_START:
case SD_ERASE_WR_BLK_END:
case MMC_LOCK_UNLOCK:
case MMC_GEN_CMD:
case MMCSPI_CRC_ON_OFF:
rsp_type = MMCSPI_RSP_R1;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R1;
break;
case MMC_SEND_CSD:
case MMC_SEND_CID:
arg = 0; /* no rca in spi mode */
rsp_type = MMCSPI_RSP_R1;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R1;
ldata_len = 16;
break;
case MMC_APP_CMD:
arg = 0; /* no rca in spi mode */
rsp_type = MMCSPI_RSP_R1;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R1;
break;
case MMC_STOP_TRANSMISSION:
case MMC_SET_WRITE_PROT:
case MMC_CLR_WRITE_PROT:
case MMC_ERASE:
rsp_type = MMCSPI_RSP_R1B;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R1B;
break;
case MMC_ALL_SEND_CID:
/* handle MMC_ALL_SEND_CID as MMC_SEND_CID */
opcode = MMC_SEND_CID;
rsp_type = MMCSPI_RSP_R1;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R2;
ldata_len = 16;
break;
case MMC_SEND_STATUS:
arg = 0; /* no rca in spi mode */
rsp_type = MMCSPI_RSP_R2;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R1;
break;
case MMCSPI_READ_OCR:
rsp_type = MMCSPI_RSP_R3;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_NONE;
break;
case SD_SEND_RELATIVE_ADDR:
/*
* Handle SD_SEND_RELATIVE_ADDR as MMC_SEND_STATUS -
* the rca returned to the caller will always be 0.
*/
opcode = MMC_SEND_STATUS;
rsp_type = MMCSPI_RSP_R2;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R6;
break;
case SD_SEND_IF_COND:
use_crc = 1;
rsp_type = MMCSPI_RSP_R7;
mmc_rsp_type = MMCSPI_TO_MMC_RSP_R7;
break;
default:
TRACE(dev, ERROR, "Invalid cmd opcode %u\n", opcode);
return (MMC_ERR_INVALID);
}
}
switch (rsp_type) {
case MMCSPI_RSP_R1:
case MMCSPI_RSP_R1B:
rsp_len = 1;
break;
case MMCSPI_RSP_R2:
rsp_len = 2;
break;
case MMCSPI_RSP_R3:
case MMCSPI_RSP_R7:
rsp_len = 5;
break;
default:
TRACE(dev, ERROR, "Unknown response type %u\n", rsp_type);
return (MMC_ERR_INVALID);
}
mmcspi_cmd->mmc_cmd = mmc_cmd;
mmcspi_cmd->opcode = opcode;
mmcspi_cmd->arg = arg;
mmcspi_cmd->flags = flags;
mmcspi_cmd->retries = retries;
mmcspi_cmd->use_crc = use_crc;
mmcspi_cmd->error_mask = MMCSPI_R1_ERR_MASK;
if (mmcspi_cmd->use_crc)
mmcspi_cmd->error_mask &= ~MMCSPI_R1_CRC_ERR;
mmcspi_cmd->rsp_type = rsp_type;
mmcspi_cmd->rsp_len = rsp_len;
mmcspi_cmd->mmc_rsp_type = mmc_rsp_type;
memset(&mmcspi_cmd->ldata, 0, sizeof(struct mmc_data));
mmcspi_cmd->ldata.len = ldata_len;
if (ldata_len) {
mmcspi_cmd->ldata.data = sc->slot.ldata_buf;
mmcspi_cmd->ldata.flags = MMC_DATA_READ;
mmcspi_cmd->data = &mmcspi_cmd->ldata;
} else
mmcspi_cmd->data = mmc_cmd->data;
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_send_cmd(device_t dev, struct mmcspi_command *cmd, uint8_t *rspbuf)
{
unsigned int err;
uint32_t opcode;
uint32_t arg;
uint8_t txbuf[8];
uint8_t crc;
TRACE_ENTER(dev);
opcode = cmd->opcode;
arg = cmd->arg;
TRACE(dev, ACTION, "sending %sMD%u(0x%08x)\n",
cmd->flags & MMC_CMD_IS_APP ? "AC": "C", opcode, arg);
/*
* Sending this byte ahead of each command prevents some cards from
* responding with unaligned data, and doesn't bother the others.
* Examples:
*
* Sandisk 32GB SDHC card, cid:
* mid=0x03 oid=0x5344 pnm="SU32G" prv=8.0 mdt=00.2000
*/
txbuf[0] = 0xff;
txbuf[1] = 0x40 | (opcode & 0x3f);
txbuf[2] = arg >> 24;
txbuf[3] = (arg >> 16) & 0xff;
txbuf[4] = (arg >> 8) & 0xff;
txbuf[5] = arg & 0xff;
if (cmd->use_crc)
crc = update_crc7(CRC7_INITIAL, &txbuf[1], 5);
else
crc = 0;
txbuf[6] = (crc << 1) | 0x01;
/*
* Some cards have garbage on the bus in the first byte slot after
* the last command byte. This seems to be common with the stop
* command. Clocking out an extra byte with the command will
* result in that data not being searched for the response token,
* which is ok, because no cards respond that fast.
*/
txbuf[7] = 0xff;
err = mmcspi_do_spi_write(dev, txbuf, sizeof(txbuf), NULL, 0);
if (MMC_ERR_NONE != err) {
TRACE(dev, ERROR, "spi write of command failed\n");
TRACE_EXIT(dev);
return (err);
}
TRACE(dev, DETAILS,
"rx cmd bytes 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n",
junkbuf[0], junkbuf[1], junkbuf[2], junkbuf[3], junkbuf[4],
junkbuf[5] );
TRACE(dev, DETAILS, "skipped response byte is 0x%02x\n", junkbuf[6]);
err = mmcspi_get_response_token(dev, MMCSPI_R1_MASK, MMCSPI_R1_VALUE,
cmd->rsp_len, MMCSPI_RSP_R1B == cmd->rsp_type, rspbuf);
if (MMC_ERR_NONE == err) {
if (rspbuf[0] & cmd->error_mask & MMCSPI_R1_CRC_ERR)
err = MMC_ERR_BADCRC;
else if (rspbuf[0] & cmd->error_mask)
err = MMC_ERR_INVALID;
}
TRACE_EXIT(dev);
return (err);
}
static unsigned int
mmcspi_read_block(device_t dev, uint8_t *data, unsigned int len,
unsigned int check_crc16, unsigned int check_crc7)
{
struct bintime start;
struct bintime elapsed;
unsigned int non_token_bytes;
unsigned int data_captured;
unsigned int crc_captured;
unsigned int pollbufpos;
unsigned int crc16_mismatch;
unsigned int err;
uint16_t crc16, computed_crc16;
uint8_t crc7, computed_crc7;
uint8_t pollbuf[MMCSPI_POLL_LEN];
uint8_t crcbuf[MMCSPI_DATA_CRC_LEN];
int i;
crc16_mismatch = 0;
TRACE_ENTER(dev);
TRACE(dev, ACTION, "read block(%u)\n", len);
/*
* With this approach, we could pointlessly read up to
* (MMCSPI_POLL_LEN - 3 - len) bytes from the spi bus, but only in
* the odd situation where MMCSPI_POLL_LEN is greater than len + 3.
*/
getbintime(&start);
do {
TRACE(dev, DETAILS, "looking for read token\n");
err = mmcspi_do_spi_read(dev, pollbuf, MMCSPI_POLL_LEN);
if (MMC_ERR_NONE != err) {
TRACE(dev, ERROR, "token read on spi failed\n");
TRACE_EXIT(dev);
return (err);
}
for (i = 0; i < MMCSPI_POLL_LEN; i++) {
if (MMCSPI_TOKEN_SB == pollbuf[i]) {
TRACE(dev, RESULT,
"found start block token at %d\n", i);
break;
} else if (MMCSPI_IS_DE_TOKEN(pollbuf[i])) {
TRACE(dev, ERROR,
"found data error token at %d\n", i);
TRACE_EXIT(dev);
return (MMC_ERR_FAILED);
}
}
getbintime(&elapsed);
bintime_sub(&elapsed, &start);
if (elapsed.sec > MMCSPI_TIMEOUT_SEC) {
TRACE(dev, ERROR, "timeout while looking for read "
"token\n");
return (MMC_ERR_TIMEOUT);
}
} while (MMCSPI_POLL_LEN == i);
/* copy any data captured in tail of poll buf to data buf */
non_token_bytes = MMCSPI_POLL_LEN - i - 1;
data_captured = min(non_token_bytes, len);
crc_captured = non_token_bytes - data_captured;
pollbufpos = i + 1;
TRACE(dev, DETAILS, "data bytes captured in pollbuf = %u\n",
data_captured);
memcpy(data, &pollbuf[pollbufpos], data_captured);
pollbufpos += data_captured;
TRACE(dev, DETAILS, "data bytes to read = %u, crc_captured = %u\n",
len - data_captured, crc_captured);
/* get any remaining data from the spi bus */
if (data_captured < len) {
err = mmcspi_do_spi_read(dev, &data[data_captured],
len - data_captured);
if (MMC_ERR_NONE != err) {
TRACE(dev, ERROR,
"spi read of remainder of block failed\n");
TRACE_EXIT(dev);
return (err);
}
}
/* copy any crc captured in the poll buf to the crc buf */
memcpy(crcbuf, &pollbuf[pollbufpos], crc_captured);
/* get any remaining crc */
if (crc_captured < MMCSPI_DATA_CRC_LEN) {
TRACE(dev, DETAILS, "crc bytes to read = %u\n",
MMCSPI_DATA_CRC_LEN - crc_captured);
err = mmcspi_do_spi_read(dev, &crcbuf[crc_captured],
MMCSPI_DATA_CRC_LEN - crc_captured);
if (MMC_ERR_NONE != err) {
TRACE(dev, ERROR, "spi read of crc failed\n");
TRACE_EXIT(dev);
return (err);
}
}
/*
* The following crc checking code is deliberately structured to
* allow a passing crc-7 check to override a failing crc-16 check
* when both are enabled.
*/
if (check_crc16) {
crc16 = ((uint16_t)crcbuf[0] << 8) | crcbuf[1];
computed_crc16 = update_crc16(CRC16_INITIAL, data, len);
TRACE(dev, RESULT, "sent_crc16=0x%04x computed_crc16=0x%04x\n",
crc16, computed_crc16);
if (computed_crc16 != crc16) {
crc16_mismatch = 1;
TRACE(dev, ERROR, "crc16 mismatch, should be 0x%04x, "
" is 0x%04x\n", crc16, computed_crc16);
if (!check_crc7) {
TRACE_EXIT(dev);
return (MMC_ERR_BADCRC);
}
}
}
if (check_crc7) {
if (crc16_mismatch) {
/*
* Let the user know something else is being checked
* after announcing an error above.
*/
TRACE(dev, ERROR, "checking crc7\n");
}
crc7 = data[len - 1] >> 1;
computed_crc7 = update_crc7(CRC7_INITIAL, data, len - 1);
TRACE(dev, RESULT, "sent_crc7=0x%02x computed_crc7=0x%02x\n",
crc7, computed_crc7);
if (computed_crc7 != crc7) {
TRACE(dev, ERROR,
"crc7 mismatch, should be 0x%02x, is 0x%02x\n",
crc7, computed_crc7);
TRACE_EXIT(dev);
return (MMC_ERR_BADCRC);
}
}
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_send_stop(device_t dev, unsigned int retries)
{
struct mmcspi_command stop;
struct mmc_command mmc_stop;
uint8_t stop_response;
unsigned int err;
int i;
TRACE_ENTER(dev);
memset(&mmc_stop, 0, sizeof(mmc_stop));
mmc_stop.opcode = MMC_STOP_TRANSMISSION;
mmc_stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
err = mmcspi_set_up_command(dev, &stop, &mmc_stop);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
/*
* Retry stop commands that fail due to bad crc here because having
* the caller retry the entire read/write command due to such a
* failure is pointlessly expensive.
*/
for (i = 0; i <= retries; i++) {
TRACE(dev, ACTION, "sending stop message\n");
err = mmcspi_send_cmd(dev, &stop, &stop_response);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
TRACE(dev, RESULT, "stop response=0x%02x\n", stop_response);
/* retry on crc error */
if (stop_response & stop.error_mask & MMCSPI_R1_CRC_ERR) {
continue;
}
}
if (stop_response & stop.error_mask) {
TRACE_EXIT(dev);
/*
* Don't return MMC_ERR_BADCRC here, even if
* MMCSPI_R1_CRC_ERR is set, because that would trigger the
* caller's retry-on-crc-error mechanism, effectively
* squaring the maximum number of retries of the stop
* command.
*/
return (MMC_ERR_FAILED);
}
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_read_phase(device_t dev, struct mmcspi_command *cmd)
{
struct mmc_data *data;
unsigned int data_offset;
unsigned int num_blocks;
unsigned int len;
unsigned int err;
uint8_t *data8;
int i;
TRACE_ENTER(dev);
data = cmd->data;
data8 = (uint8_t *)data->data;
data_offset = 0;
if (data->len < MMCSPI_DATA_BLOCK_LEN) {
num_blocks = 1;
len = data->len;
} else {
num_blocks = data->len / MMCSPI_DATA_BLOCK_LEN;
len = MMCSPI_DATA_BLOCK_LEN;
}
for (i = 0; i < num_blocks; i++) {
/*
* The CID and CSD data blocks contain both a trailing crc-7
* inside the data block and the standard crc-16 following
* the data block, so both are checked when use_crc is true.
*
* When crc checking has been enabled via CMD59, some cards
* send CID and CSD data blocks with correct crc-7 values
* but incorrect crc-16 values. read_block will accept
* those responses as valid as long as the crc-7 is correct.
*
* Examples:
*
* Super Talent 1GB SDSC card, cid:
* mid=0x1b oid=0x534d pnm="00000" prv=1.0 mdt=02.2010
*/
err = mmcspi_read_block(dev, &data8[data_offset], len,
cmd->use_crc, cmd->use_crc && ((MMC_SEND_CID == cmd->opcode)
|| (MMC_SEND_CSD == cmd->opcode)));
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
data_offset += MMCSPI_DATA_BLOCK_LEN;
}
/* multi-block read commands require a stop */
if (num_blocks > 1) {
err = mmcspi_send_stop(dev, cmd->retries);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
}
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_write_block(device_t dev, uint8_t *data, unsigned int is_multi,
unsigned char use_crc, uint8_t *status)
{
uint8_t txbuf[max(MMCSPI_POLL_LEN, 2)];
uint8_t response_token;
unsigned int err;
uint16_t crc;
TRACE_ENTER(dev);
if (use_crc)
crc = update_crc16(CRC16_INITIAL, data, MMCSPI_DATA_BLOCK_LEN);
else
crc = 0;
TRACE(dev, ACTION, "write block(512) crc=0x%04x\n", crc);
txbuf[0] = is_multi ? MMCSPI_TOKEN_SB_WM : MMCSPI_TOKEN_SB;
err = mmcspi_do_spi_write(dev, txbuf, 1, data, MMCSPI_DATA_BLOCK_LEN);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
txbuf[0] = crc >> 8;
txbuf[1] = crc & 0xff;
err = mmcspi_do_spi_write(dev, txbuf, 2, NULL, 0);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
err = mmcspi_get_response_token(dev, MMCSPI_DR_MASK, MMCSPI_DR_VALUE,
1, 1, &response_token);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
*status = response_token & MMCSPI_DR_ERR_MASK;
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_write_phase(device_t dev, struct mmcspi_command *cmd)
{
struct mmc_data *data;
unsigned int data_offset;
unsigned int num_blocks;
unsigned int err;
uint8_t *data8;
uint8_t token[2];
uint8_t status;
int i;
TRACE_ENTER(dev);
data = cmd->data;
data8 = (uint8_t *)data->data;
data_offset = 0;
num_blocks = data->len / MMCSPI_DATA_BLOCK_LEN;
for (i = 0; i < num_blocks; i++) {
err = mmcspi_write_block(dev, &data8[data_offset],
num_blocks > 1, cmd->use_crc, &status);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
if (MMCSPI_DR_ERR_NONE != status) {
if (num_blocks > 1) {
/*
* Ignore any failure reported for the stop
* command, as the return status for the
* write phase will be whatever error was
* indicated in the data respone token.
*/
mmcspi_send_stop(dev, cmd->retries);
}
/*
* A CRC error can't be ignored here, even if crc
* use is disabled, as there is no way to simply
* carry on when a data error token has been sent.
*/
if (MMCSPI_DR_ERR_CRC == status) {
TRACE_EXIT(dev);
return (MMC_ERR_BADCRC);
} else {
TRACE_EXIT(dev);
return (MMC_ERR_FAILED);
}
}
data_offset += MMCSPI_DATA_BLOCK_LEN;
}
/* successful multi-block write commands require a stop token */
if (num_blocks > 1) {
TRACE(dev, ACTION, "Sending stop token\n");
/*
* Most/all cards are a bit sluggish in assserting busy
* after receipt of the STOP_TRAN token. Clocking out an
* extra byte here provides a byte of dead time before
* looking for not busy, avoiding a premature not-busy
* determination with such cards.
*/
token[0] = MMCSPI_TOKEN_ST;
token[1] = 0xff;
err = mmcspi_do_spi_write(dev, token, sizeof(token), NULL, 0);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
err = mmcspi_wait_for_not_busy(dev);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
}
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_translate_response(device_t dev, struct mmcspi_command *cmd,
uint8_t *rspbuf)
{
struct mmc_command *mmc_cmd;
uint32_t mmc_rsp_type;
uint8_t *ldata;
mmc_cmd = cmd->mmc_cmd;
mmc_rsp_type = cmd->mmc_rsp_type;
ldata = cmd->ldata.data;
TRACE_ENTER(dev);
TRACE(dev, ACTION, "translating SPI rsp %u to SD rsp %u\n",
cmd->rsp_type, mmc_rsp_type);
if ((MMCSPI_TO_MMC_RSP_R1 == mmc_rsp_type) || (MMCSPI_TO_MMC_RSP_R1B == mmc_rsp_type)) {
TRACE(dev, ACTION, "translating SPI-R1/2 to SD-R1\n");
if ((MMCSPI_RSP_R1 == cmd->rsp_type) ||
(MMCSPI_RSP_R1B == cmd->rsp_type) ||
(MMCSPI_RSP_R2 == cmd->rsp_type)) {
mmc_cmd->resp[0] = 0;
if (rspbuf[0] & MMCSPI_R1_PARAM_ERR)
mmc_cmd->resp[0] |= R1_OUT_OF_RANGE;
if (rspbuf[0] & MMCSPI_R1_ADDR_ERR)
mmc_cmd->resp[0] |= R1_ADDRESS_ERROR;
if (rspbuf[0] & MMCSPI_R1_ERASE_ERR)
mmc_cmd->resp[0] |= R1_ERASE_SEQ_ERROR;
if (rspbuf[0] & MMCSPI_R1_CRC_ERR)
mmc_cmd->resp[0] |= R1_COM_CRC_ERROR;
if (rspbuf[0] & MMCSPI_R1_ILL_CMD)
mmc_cmd->resp[0] |= R1_ILLEGAL_COMMAND;
if (rspbuf[0] & MMCSPI_R1_ERASE_RST)
mmc_cmd->resp[0] |= R1_ERASE_RESET;
if (rspbuf[0] & MMCSPI_R1_IDLE)
mmc_cmd->resp[0] |=
(uint32_t)R1_STATE_IDLE << 9;
else
mmc_cmd->resp[0] |=
(uint32_t)R1_STATE_READY << 9;
/* When MMC_CMD_IS_APP is sent, emulate R1_APP_CMD
SD-bus status bit. */
if (!(cmd->flags & MMC_CMD_IS_APP) &&
(MMC_APP_CMD == cmd->opcode))
mmc_cmd->resp[0] |= R1_APP_CMD;
if (MMCSPI_RSP_R2 == cmd->rsp_type) {
if (rspbuf[1] & MMCSPI_R2_OOR_CSD_OW)
mmc_cmd->resp[0] |=
R1_OUT_OF_RANGE |
R1_CSD_OVERWRITE;
if (rspbuf[1] & MMCSPI_R2_ERASE_PARAM)
mmc_cmd->resp[0] |= R1_ERASE_PARAM;
if (rspbuf[1] & MMCSPI_R2_WP_VIOLATE)
mmc_cmd->resp[0] |= R1_WP_VIOLATION;
if (rspbuf[1] & MMCSPI_R2_ECC_FAIL)
mmc_cmd->resp[0] |= R1_CARD_ECC_FAILED;
if (rspbuf[1] & MMCSPI_R2_CC_ERR)
mmc_cmd->resp[0] |= R1_CC_ERROR;
if (rspbuf[1] & MMCSPI_R2_ERR)
mmc_cmd->resp[0] |= R1_ERROR;
if (rspbuf[1] & MMCSPI_R2_WP_ER_LCK)
mmc_cmd->resp[0] |=
R1_LOCK_UNLOCK_FAILED |
R1_WP_ERASE_SKIP;
if (rspbuf[1] & MMCSPI_R2_LOCKED)
mmc_cmd->resp[0] |= R1_CARD_IS_LOCKED;
}
} else
return (MMC_ERR_INVALID);
} else if (MMCSPI_TO_MMC_RSP_R2 == mmc_rsp_type) {
if (16 == cmd->ldata.len) {
TRACE(dev, ACTION, "translating SPI-R1/ldata(16) "
"to SD-R2\n");
/* ldata contains bits 127:0 of the spi response */
mmc_cmd->resp[0] =
(uint32_t)ldata[0] << 24 |
(uint32_t)ldata[1] << 16 |
(uint32_t)ldata[2] << 8 |
(uint32_t)ldata[3];
mmc_cmd->resp[1] =
(uint32_t)ldata[4] << 24 |
(uint32_t)ldata[5] << 16 |
(uint32_t)ldata[6] << 8 |
(uint32_t)ldata[7];
mmc_cmd->resp[2] =
(uint32_t)ldata[8] << 24 |
(uint32_t)ldata[9] << 16 |
(uint32_t)ldata[10] << 8 |
(uint32_t)ldata[11];
mmc_cmd->resp[3] =
(uint32_t)ldata[12] << 24 |
(uint32_t)ldata[13] << 16 |
(uint32_t)ldata[14] << 8;
} else
return (MMC_ERR_INVALID);
} else if (MMCSPI_TO_MMC_RSP_R3 == mmc_rsp_type) {
if (MMCSPI_RSP_R3 == cmd->rsp_type) {
TRACE(dev, ACTION, "translating SPI-R3 to SD-R3\n");
/* rspbuf contains a 40-bit spi-R3 from the
MMCSPI_READ_OCR response, of which bits 31:0 are
the OCR value */
/* spi response bits 31:0 mapped to
sdhc register bits 31:0 */
mmc_cmd->resp[0] =
(uint32_t)rspbuf[1] << 24 |
(uint32_t)rspbuf[2] << 16 |
(uint32_t)rspbuf[3] << 8 |
(uint32_t)rspbuf[4];
/* Clear card busy bit (indicating busy) if the
SPI-R1 idle bit is set. */
if (rspbuf[0] & MMCSPI_R1_IDLE) {
mmc_cmd->resp[0] &= ~MMC_OCR_CARD_BUSY;
} else {
mmc_cmd->resp[0] |= MMC_OCR_CARD_BUSY;
}
TRACE(dev, DETAILS, "ocr=0x%08x\n", mmc_cmd->resp[0]);
} else
return (MMC_ERR_INVALID);
} else if (MMCSPI_TO_MMC_RSP_R6 == mmc_rsp_type) {
if (MMCSPI_RSP_R2 == cmd->rsp_type) {
TRACE(dev, ACTION, "translating SPI-R2 to SD-R6\n");
/* rca returned will always be zero */
mmc_cmd->resp[0] = 0;
if (rspbuf[0] & MMCSPI_R1_CRC_ERR)
mmc_cmd->resp[0] |= 0x8000;
if (rspbuf[0] & MMCSPI_R1_ILL_CMD)
mmc_cmd->resp[0] |= 0x4000;
if (rspbuf[1] & MMCSPI_R2_ERR)
mmc_cmd->resp[0] |= 0x2000;
if (rspbuf[0] & MMCSPI_R1_IDLE)
mmc_cmd->resp[0] |=
(uint32_t)R1_STATE_IDLE << 9;
else
mmc_cmd->resp[0] |=
(uint32_t)R1_STATE_READY << 9;
} else
return (MMC_ERR_INVALID);
} else if (MMCSPI_TO_MMC_RSP_R7 == mmc_rsp_type) {
if (MMCSPI_RSP_R7 == cmd->rsp_type) {
TRACE(dev, ACTION, "translating SPI-R7 to SD-R7\n");
/* rsp buf contains a 40-bit spi-R7, of which bits
11:0 need to be transferred */
/* spi response bits 11:0 mapped to
sdhc register bits 11:0 */
mmc_cmd->resp[0] =
(uint32_t)(rspbuf[3] & 0xf) << 8 |
(uint32_t)rspbuf[4];
} else
return (MMC_ERR_INVALID);
} else if (MMCSPI_TO_MMC_RSP_NONE != mmc_rsp_type)
return (MMC_ERR_INVALID);
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_get_ocr(device_t dev, uint8_t *ocrbuf)
{
struct mmc_command mmc_cmd;
struct mmcspi_command cmd;
unsigned int err;
uint8_t r1_status;
uint8_t rspbuf[MMCSPI_MAX_RSP_LEN];
TRACE_ENTER(dev);
memset(&mmc_cmd, 0, sizeof(struct mmc_command));
mmc_cmd.opcode = MMCSPI_READ_OCR;
mmc_cmd.flags = MMC_RSP_R3 | MMC_CMD_AC;
err = mmcspi_set_up_command(dev, &cmd, &mmc_cmd);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
err = mmcspi_send_cmd(dev, &cmd, rspbuf);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
r1_status = rspbuf[0] & cmd.error_mask;
if (r1_status) {
if (r1_status & MMCSPI_R1_CRC_ERR)
err = MMC_ERR_BADCRC;
else
err = MMC_ERR_INVALID;
TRACE_EXIT(dev);
return (err);
}
memcpy(ocrbuf, &rspbuf[1], MMCSPI_OCR_LEN);
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_set_crc_on_off(device_t dev, unsigned int crc_on)
{
struct mmc_command mmc_cmd;
struct mmcspi_command cmd;
unsigned int err;
uint8_t r1_status;
uint8_t rspbuf[MMCSPI_MAX_RSP_LEN];
TRACE_ENTER(dev);
memset(&mmc_cmd, 0, sizeof(struct mmc_command));
mmc_cmd.opcode = MMCSPI_CRC_ON_OFF;
mmc_cmd.arg = crc_on ? 1 : 0;
mmc_cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
err = mmcspi_set_up_command(dev, &cmd, &mmc_cmd);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
err = mmcspi_send_cmd(dev, &cmd, rspbuf);
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
r1_status = rspbuf[0] & cmd.error_mask;
if (r1_status) {
if (r1_status & MMCSPI_R1_CRC_ERR)
err = MMC_ERR_BADCRC;
else
err = MMC_ERR_INVALID;
TRACE_EXIT(dev);
return (err);
}
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static unsigned int
mmcspi_update_crc_setting(device_t dev, unsigned int crc_on)
{
struct mmcspi_softc *sc;
struct mmcspi_slot *slot;
unsigned int err;
int i;
TRACE_ENTER(dev);
sc = device_get_softc(dev);
slot = &sc->slot;
for (i = 0; i <= MMCSPI_RETRIES; i++) {
err = mmcspi_set_crc_on_off(dev, crc_on);
if (MMC_ERR_BADCRC != err)
break;
}
if (MMC_ERR_NONE != err) {
TRACE_EXIT(dev);
return (err);
}
if (crc_on)
slot->crc_enabled = 1;
else
slot->crc_enabled = 0;
TRACE_EXIT(dev);
return (MMC_ERR_NONE);
}
static int
mmcspi_request(device_t brdev, device_t reqdev, struct mmc_request *req)
{
TRACE_ENTER(brdev);
struct mmcspi_softc *sc = device_get_softc(brdev);
struct mmcspi_slot *slot = &sc->slot;
struct mmcspi_command cmd;
struct mmc_command *mmc_cmd = req->cmd;
struct mmc_data *data;
unsigned int err;
unsigned int use_crc_sample;
int i, j;
uint32_t opcode;
uint32_t flags;
uint32_t last_opcode;
uint32_t last_flags;
uint8_t rspbuf[MMCSPI_MAX_RSP_LEN];
#define IS_CMD(code, cmd, flags) \
(!((flags) & MMC_CMD_IS_APP) && ((code) == (cmd)))
#define IS_ACMD(code, cmd, flags) \
(((flags) & MMC_CMD_IS_APP) && ((code) == (cmd)))
if (power_on != slot->host.ios.power_mode)
return (MMC_ERR_INVALID);
/*
* Sample use_crc sysctl and adjust card setting if required and
* appropriate.
*/
use_crc_sample = sc->use_crc;
if (slot->crc_init_done &&
(use_crc_sample != slot->crc_enabled)) {
err = mmcspi_update_crc_setting(brdev, use_crc_sample);
if (MMC_ERR_NONE != err)
goto out;
slot->crc_init_done = 1;
}
err = mmcspi_set_up_command(brdev, &cmd, mmc_cmd);
if (MMC_ERR_NONE != err)
goto out;
opcode = cmd.opcode;
flags = cmd.flags;
data = cmd.data;
last_opcode = slot->last_opcode;
last_flags = slot->last_flags;
/* enforce restrictions on request parameters */
if (data) {
/*
* All writes must be a multiple of the block length. All
* reads greater than the block length must be a multiple of
* the block length.
*/
if ((data->len % MMCSPI_DATA_BLOCK_LEN) &&
!((data->flags & MMC_DATA_READ) &&
(data->len < MMCSPI_DATA_BLOCK_LEN))) {
TRACE(brdev, ERROR,
"requested data phase not a multiple of %u\n",
MMCSPI_DATA_BLOCK_LEN);
err = MMC_ERR_INVALID;
goto out;
}
if (((data->flags & MMC_DATA_READ) &&
(data->flags & MMC_DATA_WRITE)) ||
(data->flags & MMC_DATA_STREAM)) {
TRACE(brdev, ERROR, "illegal data phase flags 0x%02x\n",
data->flags);
err = MMC_ERR_INVALID;
goto out;
}
}
for (i = 0; i <= cmd.retries; i++) {
/*
* On the next command following a CMD8, collect the OCR and
* save it off for use in the next ACMD41.
*/
if (IS_CMD(SD_SEND_IF_COND, last_opcode, last_flags)) {
err = mmcspi_get_ocr(brdev, slot->last_ocr);
if (MMC_ERR_NONE != err) {
if (MMC_ERR_BADCRC == err)
continue;
goto out;
}
}
err = mmcspi_send_cmd(brdev, &cmd, rspbuf);
if (MMC_ERR_NONE != err) {
if (MMC_ERR_BADCRC == err)
continue;
goto out;
}
if (data) {
if (data->flags & MMC_DATA_READ)
err = mmcspi_read_phase(brdev, &cmd);
else /* MMC_DATA_WRITE */
err = mmcspi_write_phase(brdev, &cmd);
if (MMC_ERR_NONE != err) {
if (MMC_ERR_BADCRC == err)
continue;
goto out;
}
}
break;
}
if (MMC_ERR_NONE != err)
goto out;
/*
* If this was an ACMD_SD_SEND_OP_COND or MMC_SEND_OP_COND, we need
* to return an OCR value in the result. If the response from the
* card indicates it is still in the IDLE state, supply the OCR
* value obtained after the last CMD8, otherwise issue an
* MMCSPI_READ_OCR to get the current value, which will have a valid
* CCS bit.
*
* This dance is required under this emulation approach because the
* spec stipulates that no other commands should be sent while
* ACMD_SD_SEND_OP_COND is being used to poll for the end of the
* IDLE state, and some cards do enforce that requirement.
*/
if (IS_ACMD(ACMD_SD_SEND_OP_COND, opcode, flags) ||
IS_CMD(MMC_SEND_OP_COND, opcode, flags)) {
if (rspbuf[0] & MMCSPI_R1_IDLE)
memcpy(&rspbuf[1], slot->last_ocr, MMCSPI_OCR_LEN);
else {
/*
* Some cards won't accept the MMCSPI_CRC_ON_OFF
* command until initialization is complete.
*
* Examples:
*
* Super Talent 1GB SDSC card, cid:
* mid=0x1b oid=0x534d pnm="00000" prv=1.0 mdt=02.2010
*/
if (!slot->crc_init_done) {
err = mmcspi_update_crc_setting(brdev,
sc->use_crc);
if (MMC_ERR_NONE != err)
goto out;
slot->crc_init_done = 1;
}
for (j = 0; j <= cmd.retries; j++) {
/*
* Note that in this case, we pass on the R1
* from READ_OCR.
*/
err = mmcspi_get_ocr(brdev, rspbuf);
if (MMC_ERR_NONE != err) {
if (MMC_ERR_BADCRC == err)
continue;
goto out;
}
}
if (MMC_ERR_NONE != err)
goto out;
}
/* adjust the SPI response type to include the OCR */
cmd.rsp_type = MMCSPI_RSP_R3;
}
err = mmcspi_translate_response(brdev, &cmd, rspbuf);
if (MMC_ERR_NONE != err)
goto out;
out:
slot->last_opcode = mmc_cmd->opcode;
slot->last_flags = mmc_cmd->flags;
mmc_cmd->error = err;
if (req->done)
req->done(req);
TRACE_EXIT(brdev);
return (err);
}
static int
mmcspi_get_ro(device_t brdev, device_t reqdev)
{
TRACE_ENTER(brdev);
TRACE_EXIT(brdev);
/* XXX no support for this currently */
return (0);
}
static int
mmcspi_acquire_host(device_t brdev, device_t reqdev)
{
struct mmcspi_slot *slot;
int err;
TRACE_ENTER(brdev);
err = 0;
slot = device_get_ivars(reqdev);
MMCSPI_LOCK_SLOT(slot);
while (slot->bus_busy)
mtx_sleep(slot, &slot->mtx, 0, "mmcspiah", 0);
slot->bus_busy++;
MMCSPI_UNLOCK_SLOT(slot);
TRACE_EXIT(brdev);
return (err);
}
static int
mmcspi_release_host(device_t brdev, device_t reqdev)
{
struct mmcspi_slot *slot;
TRACE_ENTER(brdev);
slot = device_get_ivars(reqdev);
MMCSPI_LOCK_SLOT(slot);
slot->bus_busy--;
MMCSPI_UNLOCK_SLOT(slot);
wakeup(slot);
TRACE_EXIT(brdev);
return (0);
}
static int
mmcspi_modevent_handler(module_t mod, int what, void *arg)
{
switch (what) {
case MOD_LOAD:
init_crc7tab();
init_crc16tab();
memset(onesbuf, 0xff, sizeof(onesbuf));
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static int
mmcspi_switch_vccq(device_t bus, device_t child)
{
return (0);
}
#if defined(MMCSPI_ENABLE_DEBUG_FUNCS)
static void
mmcspi_dump_data(device_t dev, const char *label, uint8_t *data,
unsigned int len)
{
unsigned int i, j;
unsigned int num_lines;
unsigned int residual;
TRACE_ENTER(dev);
num_lines = len / 16;
residual = len - 16 * num_lines;
for(i = 0; i < num_lines; i++) {
device_printf(dev, "%s:", label);
for(j = 0; j < 16; j++)
printf(" %02x", data[i * 16 + j]);
printf("\n");
}
if (residual) {
device_printf(dev, "%s:", label);
for(j = 0; j < residual; j++)
printf(" %02x", data[num_lines * 16 + j]);
printf("\n");
}
TRACE_EXIT(dev);
}
static void
mmcspi_dump_spi_bus(device_t dev, unsigned int len)
{
unsigned int num_blocks;
unsigned int residual;
unsigned int i;
TRACE_ENTER(dev);
num_blocks = len / MMCSPI_DATA_BLOCK_LEN;
residual = len - num_blocks * MMCSPI_DATA_BLOCK_LEN;
for (i = 0; i < num_blocks; i++) {
if (MMC_ERR_NONE != mmcspi_do_spi_read(dev, junkbuf,
MMCSPI_DATA_BLOCK_LEN)) {
device_printf(dev, "spi read failed\n");
return;
}
mmcspi_dump_data(dev, "bus_data", junkbuf,
MMCSPI_DATA_BLOCK_LEN);
}
if (residual) {
if (MMC_ERR_NONE != mmcspi_do_spi_read(dev, junkbuf,
residual)) {
device_printf(dev, "spi read failed\n");
return;
}
mmcspi_dump_data(dev, "bus_data", junkbuf, residual);
}
TRACE_EXIT(dev);
}
#endif
static device_method_t mmcspi_methods[] = {
/* device_if */
DEVMETHOD(device_probe, mmcspi_probe),
DEVMETHOD(device_attach, mmcspi_attach),
DEVMETHOD(device_detach, mmcspi_detach),
DEVMETHOD(device_suspend, mmcspi_suspend),
DEVMETHOD(device_resume, mmcspi_resume),
/* Bus interface */
DEVMETHOD(bus_read_ivar, mmcspi_read_ivar),
DEVMETHOD(bus_write_ivar, mmcspi_write_ivar),
/* mmcbr_if */
DEVMETHOD(mmcbr_update_ios, mmcspi_update_ios),
DEVMETHOD(mmcbr_request, mmcspi_request),
DEVMETHOD(mmcbr_get_ro, mmcspi_get_ro),
DEVMETHOD(mmcbr_acquire_host, mmcspi_acquire_host),
DEVMETHOD(mmcbr_release_host, mmcspi_release_host),
DEVMETHOD(mmcbr_switch_vccq, mmcspi_switch_vccq),
{0, 0},
};
static driver_t mmcspi_driver = {
"mmcspi",
mmcspi_methods,
sizeof(struct mmcspi_softc),
};
DRIVER_MODULE(mmcspi, spibus, mmcspi_driver, mmcspi_modevent_handler, NULL);
MODULE_DEPEND(mmcspi, spibus, 1, 1, 1);
MMC_DECLARE_BRIDGE(mmcspi);
#ifdef FDT
SPIBUS_FDT_PNP_INFO(compat_data);
#endif

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