[U-Boot] [PATCH 3/3 v8] mmc: add generic mmc spi driver

Thomas Chou
2010-05-19T04:37:47Z

This patch supports mmc/sd card with spi interface. It is based on
the generic mmc framework. It works with SDHC and supports multi
blocks read/write.

The crc checksum on data packet is enabled with the def,
#define CONFIG_MMC_SPI_CRC_ON

There is a subcomamnd "mmc_spi" to setup spi bus and cs at run time.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
---
v8: make mmc.c core aware of spi protocol, per Andy.
work with multi blocks read/write.
reduce cmd_mmc_spi.c, doesnt query to mmc dev list.
v7: use find_mmc_device(dev, verbose), per Wolfgang.
v6: add constant macros, crc check on data, per Andy.
v5: remove dev_num limit to search.
v4: change mmc_spi subcommand to search and create new mmc dev.
v3: add mmc_spi_init() proto to mmc_spi.h.
v2: add crc7, use cmd58 to read ocr, add subcommand mmc_spi.

common/Makefile | 1 +
common/cmd_mmc_spi.c | 82 ++++++++++++++
drivers/mmc/Makefile | 1 +
drivers/mmc/mmc.c | 81 +++++++++++---
drivers/mmc/mmc_spi.c | 296 +++++++++++++++++++++++++++++++++++++++++++++++++
include/mmc.h | 8 ++
6 files changed, 451 insertions(+), 18 deletions(-)
create mode 100644 common/cmd_mmc_spi.c
create mode 100644 drivers/mmc/mmc_spi.c

diff --git a/common/Makefile b/common/Makefile
index 2c37073..55beac5 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -119,6 +119,7 @@ COBJS-$(CONFIG_CMD_MII) += miiphyutil.o
COBJS-$(CONFIG_CMD_MII) += cmd_mii.o
COBJS-$(CONFIG_CMD_MISC) += cmd_misc.o
COBJS-$(CONFIG_CMD_MMC) += cmd_mmc.o
+COBJS-$(CONFIG_CMD_MMC_SPI) += cmd_mmc_spi.o
COBJS-$(CONFIG_MP) += cmd_mp.o
COBJS-$(CONFIG_CMD_MTDPARTS) += cmd_mtdparts.o
COBJS-$(CONFIG_CMD_NAND) += cmd_nand.o
diff --git a/common/cmd_mmc_spi.c b/common/cmd_mmc_spi.c
new file mode 100644
index 0000000..13933b0
--- /dev/null
+++ b/common/cmd_mmc_spi.c
@@ -0,0 +1,82 @@
+/*
+ * Command for mmc_spi setup.
+ *
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <mmc.h>
+#include <spi.h>
+
+#ifndef CONFIG_MMC_SPI_BUS
+# define CONFIG_MMC_SPI_BUS 0
+#endif
+#ifndef CONFIG_MMC_SPI_CS
+# define CONFIG_MMC_SPI_CS 1
+#endif
+#ifndef CONFIG_MMC_SPI_SPEED
+# define CONFIG_MMC_SPI_SPEED 25000000
+#endif
+#ifndef CONFIG_MMC_SPI_MODE
+# define CONFIG_MMC_SPI_MODE SPI_MODE_3
+#endif
+
+static int do_mmc_spi(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ uint bus = CONFIG_MMC_SPI_BUS;
+ uint cs = CONFIG_MMC_SPI_CS;
+ uint speed = CONFIG_MMC_SPI_SPEED;
+ uint mode = CONFIG_MMC_SPI_MODE;
+ char *endp;
+ struct mmc *mmc;
+
+ if (argc < 2)
+ goto usage;
+
+ cs = simple_strtoul(argv[1], &endp, 0);
+ if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
+ goto usage;
+ if (*endp == ':') {
+ if (endp[1] == 0)
+ goto usage;
+ bus = cs;
+ cs = simple_strtoul(endp + 1, &endp, 0);
+ if (*endp != 0)
+ goto usage;
+ }
+ if (argc >= 3) {
+ speed = simple_strtoul(argv[2], &endp, 0);
+ if (*argv[2] == 0 || *endp != 0)
+ goto usage;
+ }
+ if (argc >= 4) {
+ mode = simple_strtoul(argv[3], &endp, 16);
+ if (*argv[3] == 0 || *endp != 0)
+ goto usage;
+ }
+ if (!spi_cs_is_valid(bus, cs)) {
+ printf("Invalid SPI bus %u cs %u\n", bus, cs);
+ return 1;
+ }
+
+ mmc = mmc_spi_init(bus, cs, speed, mode);
+ if (!mmc) {
+ printf("Failed to create MMC Device\n");
+ return 1;
+ }
+ printf("%s: %d at %u:%u %u %u\n", mmc->name, mmc->block_dev.dev,
+ bus, cs, speed, mode);
+ return 0;
+
+usage:
+ cmd_usage(cmdtp);
+ return 1;
+}
+
+U_BOOT_CMD(
+ mmc_spi, 4, 0, do_mmc_spi,
+ "mmc_spi setup",
+ "[bus:]cs [hz] [mode] - setup mmc_spi device on given\n"
+ " SPI bus and chip select\n"
+);
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 6fa04b8..02ed329 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -28,6 +28,7 @@ LIB := $(obj)libmmc.a
COBJS-$(CONFIG_GENERIC_MMC) += mmc.o
COBJS-$(CONFIG_ATMEL_MCI) += atmel_mci.o
COBJS-$(CONFIG_BFIN_SDH) += bfin_sdh.o
+COBJS-$(CONFIG_MMC_SPI) += mmc_spi.o
COBJS-$(CONFIG_OMAP3_MMC) += omap3_mmc.o
COBJS-$(CONFIG_FSL_ESDHC) += fsl_esdhc.o
COBJS-$(CONFIG_MXC_MMC) += mxcmmc.o
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index aefd721..0e819f8 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -283,7 +283,10 @@ static int mmc_write_blocks(struct mmc *mmc, const char *src, uint start,
return err;
}

- if (blkcnt > 1) {
+ /* SPI multiblock writes terminate using a special
+ * token, not a STOP_TRANSMISSION request.
+ */
+ if (!mmc_host_is_spi(mmc) && blkcnt > 1) {
cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
cmd.cmdarg = 0;
cmd.resp_type = MMC_RSP_R1b;
@@ -458,6 +461,18 @@ sd_send_op_cond(struct mmc *mmc)
if (mmc->version != SD_VERSION_2)
mmc->version = SD_VERSION_1_0;

+ if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
+ cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
+ cmd.resp_type = MMC_RSP_R3;
+ cmd.cmdarg = 0;
+ cmd.flags = 0;
+
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+
+ if (err)
+ return err;
+ }
+
mmc->ocr = cmd.response[0];

mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
@@ -492,6 +507,18 @@ int mmc_send_op_cond(struct mmc *mmc)
if (timeout <= 0)
return UNUSABLE_ERR;

+ if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
+ cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
+ cmd.resp_type = MMC_RSP_R3;
+ cmd.cmdarg = 0;
+ cmd.flags = 0;
+
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+
+ if (err)
+ return err;
+ }
+
mmc->version = MMC_VERSION_UNKNOWN;
mmc->ocr = cmd.response[0];

@@ -776,8 +803,22 @@ int mmc_startup(struct mmc *mmc)
u64 cmult, csize;
struct mmc_cmd cmd;

+#ifdef CONFIG_MMC_SPI_CRC_ON
+ if (mmc_host_is_spi(mmc)) { /* enable CRC check for spi */
+ cmd.cmdidx = MMC_CMD_SPI_CRC_ON_OFF;
+ cmd.resp_type = MMC_RSP_R1;
+ cmd.cmdarg = 1;
+ cmd.flags = 0;
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+
+ if (err)
+ return err;
+ }
+#endif
+
/* Put the Card in Identify Mode */
- cmd.cmdidx = MMC_CMD_ALL_SEND_CID;
+ cmd.cmdidx = mmc_host_is_spi(mmc) ? MMC_CMD_SEND_CID :
+ MMC_CMD_ALL_SEND_CID; /* cmd not supported in spi */
cmd.resp_type = MMC_RSP_R2;
cmd.cmdarg = 0;
cmd.flags = 0;
@@ -794,18 +835,20 @@ int mmc_startup(struct mmc *mmc)
* For SD cards, get the Relatvie Address.
* This also puts the cards into Standby State
*/
- cmd.cmdidx = SD_CMD_SEND_RELATIVE_ADDR;
- cmd.cmdarg = mmc->rca << 16;
- cmd.resp_type = MMC_RSP_R6;
- cmd.flags = 0;
+ if (!mmc_host_is_spi(mmc)) { /* cmd not supported in spi */
+ cmd.cmdidx = SD_CMD_SEND_RELATIVE_ADDR;
+ cmd.cmdarg = mmc->rca << 16;
+ cmd.resp_type = MMC_RSP_R6;
+ cmd.flags = 0;

- err = mmc_send_cmd(mmc, &cmd, NULL);
+ err = mmc_send_cmd(mmc, &cmd, NULL);

- if (err)
- return err;
+ if (err)
+ return err;

- if (IS_SD(mmc))
- mmc->rca = (cmd.response[0] >> 16) & 0xffff;
+ if (IS_SD(mmc))
+ mmc->rca = (cmd.response[0] >> 16) & 0xffff;
+ }

/* Get the Card-Specific Data */
cmd.cmdidx = MMC_CMD_SEND_CSD;
@@ -881,14 +924,16 @@ int mmc_startup(struct mmc *mmc)
mmc->write_bl_len = 512;

/* Select the card, and put it into Transfer Mode */
- cmd.cmdidx = MMC_CMD_SELECT_CARD;
- cmd.resp_type = MMC_RSP_R1b;
- cmd.cmdarg = mmc->rca << 16;
- cmd.flags = 0;
- err = mmc_send_cmd(mmc, &cmd, NULL);
+ if (!mmc_host_is_spi(mmc)) { /* cmd not supported in spi */
+ cmd.cmdidx = MMC_CMD_SELECT_CARD;
+ cmd.resp_type = MMC_RSP_R1b;
+ cmd.cmdarg = mmc->rca << 16;
+ cmd.flags = 0;
+ err = mmc_send_cmd(mmc, &cmd, NULL);

- if (err)
- return err;
+ if (err)
+ return err;
+ }

if (IS_SD(mmc))
err = sd_change_freq(mmc);
diff --git a/drivers/mmc/mmc_spi.c b/drivers/mmc/mmc_spi.c
new file mode 100644
index 0000000..d675c7f
--- /dev/null
+++ b/drivers/mmc/mmc_spi.c
@@ -0,0 +1,296 @@
+/*
+ * generic mmc spi driver
+ *
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <part.h>
+#include <mmc.h>
+#include <spi.h>
+#include <crc.h>
+#include <linux/crc7.h>
+
+/*
+ * MMC/SD in SPI mode reports R1 status always
+ */
+#define R1_SPI_IDLE (1 << 0)
+#define R1_SPI_ERASE_RESET (1 << 1)
+#define R1_SPI_ILLEGAL_COMMAND (1 << 2)
+#define R1_SPI_COM_CRC (1 << 3)
+#define R1_SPI_ERASE_SEQ (1 << 4)
+#define R1_SPI_ADDRESS (1 << 5)
+#define R1_SPI_PARAMETER (1 << 6)
+/* R1 bit 7 is always zero */
+#define R1_SPI_ERROR (1 << 7)
+
+/* Response tokens used to ack each block written: */
+#define SPI_MMC_RESPONSE_CODE(x) ((x) & 0x1f)
+#define SPI_RESPONSE_ACCEPTED ((2 << 1)|1)
+#define SPI_RESPONSE_CRC_ERR ((5 << 1)|1)
+#define SPI_RESPONSE_WRITE_ERR ((6 << 1)|1)
+
+/* Read and write blocks start with these tokens and end with crc;
+ * on error, read tokens act like a subset of R2_SPI_* values.
+ */
+#define SPI_TOKEN_SINGLE 0xfe /* single block r/w, multiblock read */
+#define SPI_TOKEN_MULTI_WRITE 0xfc /* multiblock write */
+#define SPI_TOKEN_STOP_TRAN 0xfd /* terminate multiblock write */
+
+/* MMC SPI commands start with a start bit "0" and a transmit bit "1" */
+#define MMC_SPI_CMD(x) (0x40 | (x & 0x3f))
+
+/* bus capability */
+#define MMC_SPI_VOLTAGE (MMC_VDD_32_33 | MMC_VDD_33_34)
+#define MMC_SPI_MIN_CLOCK 400000 /* 400KHz to meet MMC spec */
+#define MMC_SPI_MAX_BLOCKS 65536
+
+/* timeout value */
+#define CTOUT 8
+#define RTOUT 3000000 /* 1 sec */
+#define WTOUT 3000000 /* 1 sec */
+
+static uint mmc_spi_sendcmd(struct mmc *mmc, u8 cmdidx, u32 cmdarg)
+{
+ struct spi_slave *spi = mmc->priv;
+ u8 cmdo[7];
+ u8 r1;
+ int i;
+ cmdo[0] = 0xff;
+ cmdo[1] = MMC_SPI_CMD(cmdidx);
+ cmdo[2] = cmdarg >> 24;
+ cmdo[3] = cmdarg >> 16;
+ cmdo[4] = cmdarg >> 8;
+ cmdo[5] = cmdarg;
+ cmdo[6] = (crc7(0, &cmdo[1], 5) << 1) | 0x01;
+ spi_xfer(spi, 7 * 8, cmdo, NULL, SPI_XFER_BEGIN);
+ for (i = 0; i < CTOUT; i++) {
+ spi_xfer(spi, 1 * 8, NULL, &r1, 0);
+ if (i && (r1 & 0x80) == 0) /* r1 response */
+ break;
+ }
+ debug("%s:cmd%d resp%d %x\n", __func__, cmdidx, i, r1);
+ return r1;
+}
+
+static uint mmc_spi_readdata(struct mmc *mmc, char *buf,
+ u32 bcnt, u32 bsize)
+{
+ struct spi_slave *spi = mmc->priv;
+ u8 tok;
+ u8 crc[2];
+ int i;
+ while (bcnt--) {
+ for (i = 0; i < RTOUT; i++) {
+ spi_xfer(spi, 1 * 8, NULL, &tok, 0);
+ if (tok != 0xff) /* data token */
+ break;
+ }
+ debug("%s:tok%d %x\n", __func__, i, tok);
+ if (tok == SPI_TOKEN_SINGLE) {
+ spi_xfer(spi, bsize * 8, NULL, buf, 0);
+ spi_xfer(spi, 2 * 8, NULL, crc, 0);
+#ifdef CONFIG_MMC_SPI_CRC_ON
+ if (cyg_crc16((unsigned char *)buf, bsize) !=
+ ((crc[0] << 8) | crc[1])) {
+ debug("%s: CRC error\n", mmc->name);
+ tok = R1_SPI_COM_CRC;
+ break;
+ }
+#endif
+ tok = 0;
+ } else {
+ tok = R1_SPI_ERROR;
+ break;
+ }
+ buf += bsize;
+ }
+ return tok;
+}
+
+static uint mmc_spi_writedata(struct mmc *mmc, const char *buf,
+ u32 bcnt, u32 bsize, int multi)
+{
+ struct spi_slave *spi = mmc->priv;
+ u8 r1;
+ const u8 toks[2] = {0xff, SPI_TOKEN_SINGLE};
+ const u8 tokm[2] = {0xff, SPI_TOKEN_MULTI_WRITE};
+ const u8 stop[2] = {0xff, SPI_TOKEN_STOP_TRAN};
+ u8 crc[2];
+ int i;
+ while (bcnt--) {
+#ifdef CONFIG_MMC_SPI_CRC_ON
+ u16 cks;
+ cks = cyg_crc16((unsigned char *)buf, bsize);
+ crc[0] = cks >> 8;
+ crc[1] = cks;
+#endif
+ spi_xfer(spi, 2 * 8, multi ? tokm : toks, NULL, 0);
+ spi_xfer(spi, bsize * 8, buf, NULL, 0);
+ spi_xfer(spi, 2 * 8, crc, NULL, 0);
+ for (i = 0; i < CTOUT; i++) {
+ spi_xfer(spi, 1 * 8, NULL, &r1, 0);
+ if ((r1 & 0x10) == 0) /* response token */
+ break;
+ }
+ debug("%s:tok%d %x\n", __func__, i, r1);
+ if (SPI_MMC_RESPONSE_CODE(r1) == SPI_RESPONSE_ACCEPTED) {
+ for (i = 0; i < WTOUT; i++) { /* wait busy */
+ spi_xfer(spi, 1 * 8, NULL, &r1, 0);
+ if (i && r1 == 0xff) {
+ r1 = 0;
+ break;
+ }
+ }
+ if (i == WTOUT) {
+ debug("%s:wtout %x\n", __func__, r1);
+ r1 = R1_SPI_ERROR;
+ break;
+ }
+ } else {
+ debug("%s: err %x\n", __func__, r1);
+ r1 = R1_SPI_COM_CRC;
+ break;
+ }
+ buf += bsize;
+ }
+ if (multi && bcnt == -1) { /* stop multi write */
+ spi_xfer(spi, 2 * 8, stop, NULL, 0);
+ for (i = 0; i < WTOUT; i++) { /* wait busy */
+ spi_xfer(spi, 1 * 8, NULL, &r1, 0);
+ if (i && r1 == 0xff) {
+ r1 = 0;
+ break;
+ }
+ }
+ if (i == WTOUT) {
+ debug("%s:wstop %x\n", __func__, r1);
+ r1 = R1_SPI_ERROR;
+ }
+ }
+ return r1;
+}
+
+/* rswap: swap spi byte stream to mmc response */
+static inline uint rswap(u8 *d)
+{
+ return (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
+}
+
+static inline void mmc_spi_deactivate(struct mmc *mmc)
+{
+ struct spi_slave *spi = mmc->priv;
+ spi_xfer(spi, 1 * 8, NULL, NULL, SPI_XFER_END);
+ spi_xfer(spi, 1 * 8, NULL, NULL, 0);
+}
+
+static int mmc_spi_request(struct mmc *mmc, struct mmc_cmd *cmd,
+ struct mmc_data *data)
+{
+ struct spi_slave *spi = mmc->priv;
+ u8 r1;
+ ushort cmdidx = cmd->cmdidx;
+ uint cmdarg = cmd->cmdarg;
+ u8 resp[16];
+ int i;
+ int ret = 0;
+ debug("%s:cmd%d %x %x %x\n", __func__,
+ cmd->cmdidx, cmd->resp_type, cmd->cmdarg, cmd->flags);
+ r1 = mmc_spi_sendcmd(mmc, cmdidx, cmdarg);
+ if (r1 == 0xff) { /* no response */
+ ret = NO_CARD_ERR;
+ goto done;
+ } else if (r1 & R1_SPI_COM_CRC) {
+ ret = COMM_ERR;
+ goto done;
+ } else if (r1 & ~R1_SPI_IDLE) { /* other errors */
+ ret = TIMEOUT;
+ goto done;
+ } else if (cmd->resp_type == MMC_RSP_R2) {
+ r1 = mmc_spi_readdata(mmc, (char *)resp, 1, 16);
+ for (i = 0; i < 4; i++)
+ cmd->response[i] = rswap(resp + i * 4);
+ debug("r128 %x %x %x %x\n", cmd->response[0], cmd->response[1],
+ cmd->response[2], cmd->response[3]);
+ } else if (!data) {
+ switch (cmdidx) {
+ case SD_CMD_APP_SEND_OP_COND:
+ case MMC_CMD_SEND_OP_COND:
+ cmd->response[0] = (r1 & R1_SPI_IDLE) ? 0 : OCR_BUSY;
+ break;
+ case SD_CMD_SEND_IF_COND:
+ case MMC_CMD_SPI_READ_OCR:
+ spi_xfer(spi, 4 * 8, NULL, resp, 0);
+ cmd->response[0] = rswap(resp);
+ debug("r32 %x\n", cmd->response[0]);
+ break;
+ }
+ } else {
+ debug("%s:data %x %x %x\n", __func__,
+ data->flags, data->blocks, data->blocksize);
+ if (data->flags == MMC_DATA_READ)
+ r1 = mmc_spi_readdata(mmc, data->dest,
+ data->blocks, data->blocksize);
+ else if (data->flags == MMC_DATA_WRITE)
+ r1 = mmc_spi_writedata(mmc, data->src,
+ data->blocks, data->blocksize,
+ (cmdidx == MMC_CMD_WRITE_MULTIPLE_BLOCK));
+ if (r1 & R1_SPI_COM_CRC)
+ ret = COMM_ERR;
+ else if (r1) /* other errors */
+ ret = TIMEOUT;
+ }
+done:
+ mmc_spi_deactivate(mmc);
+ return ret;
+}
+
+static void mmc_spi_set_ios(struct mmc *mmc)
+{
+ debug("%s: clock %u\n", __func__, mmc->clock);
+ /* the current spi framework does not support change clock freq */
+}
+
+static int mmc_spi_init_p(struct mmc *mmc)
+{
+ struct spi_slave *spi = mmc->priv;
+ debug("%s: clock %u\n", __func__, mmc->clock);
+ spi_claim_bus(spi);
+ /* finish any pending transfer */
+ spi_xfer(spi, 39 * 8, NULL, NULL,
+ SPI_XFER_BEGIN | SPI_XFER_END);
+ /* cs deactivated for 100+ clock */
+ spi_xfer(spi, 18 * 8, NULL, NULL, 0);
+ return 0;
+}
+
+struct mmc *mmc_spi_init(uint bus, uint cs, uint speed, uint mode)
+{
+ struct mmc *mmc;
+
+ mmc = malloc(sizeof(*mmc));
+ if (!mmc)
+ return NULL;
+ mmc->priv = spi_setup_slave(bus, cs, speed, mode);
+ if (!mmc->priv) {
+ free(mmc);
+ return NULL;
+ }
+ sprintf(mmc->name, "MMC_SPI");
+ mmc->send_cmd = mmc_spi_request;
+ mmc->set_ios = mmc_spi_set_ios;
+ mmc->init = mmc_spi_init_p;
+ mmc->host_caps = MMC_MODE_SPI;
+
+ mmc->voltages = MMC_SPI_VOLTAGE;
+ mmc->f_max = speed;
+ mmc->f_min = MMC_SPI_MIN_CLOCK;
+ mmc->block_dev.part_type = PART_TYPE_DOS;
+ mmc->b_max = MMC_SPI_MAX_BLOCKS;
+
+ mmc_register(mmc);
+
+ return mmc;
+}
diff --git a/include/mmc.h b/include/mmc.h
index 04c7eaf..0422e22 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -44,6 +44,9 @@
#define MMC_MODE_HS_52MHz 0x010
#define MMC_MODE_4BIT 0x100
#define MMC_MODE_8BIT 0x200
+#define MMC_MODE_SPI 0x400
+
+#define mmc_host_is_spi(mmc) ((mmc)->host_caps & MMC_MODE_SPI)

#define SD_DATA_4BIT 0x00040000

@@ -75,6 +78,8 @@
#define MMC_CMD_WRITE_SINGLE_BLOCK 24
#define MMC_CMD_WRITE_MULTIPLE_BLOCK 25
#define MMC_CMD_APP_CMD 55
+#define MMC_CMD_SPI_READ_OCR 58
+#define MMC_CMD_SPI_CRC_ON_OFF 59

#define SD_CMD_SEND_RELATIVE_ADDR 3
#define SD_CMD_SWITCH_FUNC 6
@@ -277,6 +282,9 @@ struct mmc *find_mmc_device(int dev_num);
void print_mmc_devices(char separator);
int board_mmc_getcd(u8 *cd, struct mmc *mmc);

+/* Driver initialization prototypes */
+struct mmc *mmc_spi_init(uint bus, uint cs, uint speed, uint mode);
+
#ifndef CONFIG_GENERIC_MMC
int mmc_legacy_init(int verbose);
#endif
--
1.7.1.86.g0e460