Patchwork [U-Boot,v3,4/5] Add support for qc_mmc MMC Controller

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Submitter mohamed.haneef@lntinfotech.com
Date May 10, 2012, 12:19 p.m.
Message ID <1336652379-22696-1-git-send-email-mohamed.haneef@lntinfotech.com>
Download mbox | patch
Permalink /patch/158262/
State Deferred
Delegated to: Andy Fleming
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mohamed.haneef@lntinfotech.com - May 10, 2012, 12:19 p.m.
From: Mohamed Haneef <mohamed.haneef@lntinfotech.com>

	* Support for qc_mmc MMC Controller

Signed-off-by: Mohamed Haneef <mohamed.haneef@lntinfotech.com>

changes for v2:
 - changed the patch title to support for qc_mmc MMC Controller

changes for v3:
 - removed the unnecessary type casting
 - simplified the code by making use of struct mmc_priv *priv variable.
 - removed unused defines.
---
 arch/arm/include/asm/arch-msm7630/mmc.h |  390 +++++++++++++++++++++
 drivers/mmc/Makefile                    |    1 +
 drivers/mmc/qc_mmc.c                    |  581 +++++++++++++++++++++++++++++++
 3 files changed, 972 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/include/asm/arch-msm7630/mmc.h
 create mode 100644 drivers/mmc/qc_mmc.c

Patch

diff --git a/arch/arm/include/asm/arch-msm7630/mmc.h b/arch/arm/include/asm/arch-msm7630/mmc.h
new file mode 100644
index 0000000..75beffc
--- /dev/null
+++ b/arch/arm/include/asm/arch-msm7630/mmc.h
@@ -0,0 +1,390 @@ 
+/*
+ * (C) Copyright 2012
+ * LARSEN AND TOUBRO INFOTECH LTD <www.lntinfotech.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef __MMC_H__
+#define __MMC_H__
+
+
+#include <common.h>
+#include <part.h>
+#include <mmc.h>
+
+/*
+ * Define Macros for SDCC Registers
+ */
+/* 8 bit */
+#define MMC_BOOT_MCI_POWER                 0x000
+
+/* MCICMD output control - 6th bit */
+#ifdef PLATFORM_MSM7X30
+#define MMC_BOOT_MCI_OPEN_DRAIN            (1 << 6)
+#define MMC_BOOT_MCI_PWR_OFF               0x00
+#define MMC_BOOT_MCI_PWR_UP                0x01
+#define MMC_BOOT_MCI_PWR_ON                0x01
+#else
+#define MMC_BOOT_MCI_OPEN_DRAIN            (1 << 6)
+#define MMC_BOOT_MCI_PWR_OFF               0x00
+#define MMC_BOOT_MCI_PWR_UP                0x02
+#define MMC_BOOT_MCI_PWR_ON                0x03
+#endif
+
+/* 16 bits */
+#define MMC_BOOT_MCI_CLK                  0x004
+/* Enable MCI bus clock - 0: clock disabled 1: enabled */
+#define MMC_BOOT_MCI_CLK_ENABLE           (1 << 8)
+/* Disable clk o/p when bus idle- 0:always enabled 1:enabled when bus active */
+#define MMC_BOOT_MCI_CLK_PWRSAVE          (1 << 9)
+/* Enable Widebus mode - 00: 1 bit mode 10:4 bit mode 01/11: 8 bit mode */
+#define MMC_BOOT_MCI_CLK_WIDEBUS_MODE     (3 << 10)
+#define MMC_BOOT_MCI_CLK_WIDEBUS_1_BIT    0
+#define MMC_BOOT_MCI_CLK_WIDEBUS_4_BIT    (2 << 10)
+#define MMC_BOOT_MCI_CLK_WIDEBUS_8_BIT    (1 << 10)
+/* Enable flow control- 0: disable 1: enable */
+#define MMC_BOOT_MCI_CLK_ENA_FLOW         (1 << 12)
+/* Set/clear to select rising/falling edge for data/cmd output */
+#define MMC_BOOT_MCI_CLK_INVERT_OUT       (1 << 13)
+/* Select to lach data/cmd coming in falling/rising/feedbk/loopbk of MCIclk */
+#define MMC_BOOT_MCI_CLK_IN_FALLING       0x0
+#define MMC_BOOT_MCI_CLK_IN_RISING        (1 << 14)
+#define MMC_BOOT_MCI_CLK_IN_FEEDBACK      (2 << 14)
+#define MMC_BOOT_MCI_CLK_IN_LOOPBACK      (3 << 14)
+
+/* Bus Width */
+#define MMC_BOOT_BUS_WIDTH_1_BIT          0
+#define MMC_BOOT_BUS_WIDTH_4_BIT          2
+#define MMC_BOOT_BUS_WIDTH_8_BIT          3
+
+/* 32 bits */
+#define MMC_BOOT_MCI_ARGUMENT              0x008
+
+/* 16 bits */
+#define MMC_BOOT_MCI_CMD                   0x00C
+/* Command Index: 0 -5 */
+/* Waits for response if set */
+#define MMC_BOOT_MCI_CMD_RESPONSE         (1 << 6)
+/* Receives a 136-bit long response if set */
+#define MMC_BOOT_MCI_CMD_LONGRSP          (1 << 7)
+/* If set, CPSM disables command timer and waits for interrupt */
+#define MMC_BOOT_MCI_CMD_INTERRUPT        (1 << 8)
+/* If set waits for CmdPend before starting to send a command */
+#define MMC_BOOT_MCI_CMD_PENDING          (1 << 9)
+/* CPSM is enabled if set */
+#define MMC_BOOT_MCI_CMD_ENABLE           (1 << 10)
+/* If set PROG_DONE status bit asserted when busy is de-asserted */
+#define MMC_BOOT_MCI_CMD_PROG_ENA         (1 << 11)
+/* To indicate that this is a Command with Data (for SDIO interrupts) */
+#define MMC_BOOT_MCI_CMD_DAT_CMD          (1 << 12)
+/* Signals the next command to be an abort (stop) command. Always read 0 */
+#define MMC_BOOT_MCI_CMD_MCIABORT         (1 << 13)
+/* Waits for Command Completion Signal if set */
+#define MMC_BOOT_MCI_CMD_CCS_ENABLE       (1 << 14)
+/* If set sends CCS disable sequence */
+#define MMC_BOOT_MCI_CMD_CCS_DISABLE      (1 << 15)
+
+#define MMC_BOOT_MCI_RESP_CMD               0x010
+
+#define MMC_BOOT_MCI_RESP_0                 0x014
+#define MMC_BOOT_MCI_RESP_1                 0x018
+#define MMC_BOOT_MCI_RESP_2                 0x01C
+#define MMC_BOOT_MCI_RESP_3                 0x020
+
+#define MMC_BOOT_MCI_DATA_TIMER             0x024
+#define MMC_BOOT_MCI_DATA_LENGTH            0x028
+/* 16 bits */
+#define MMC_BOOT_MCI_DATA_CTL               0x02C
+/* Data transfer enabled */
+#define MMC_BOOT_MCI_DATA_ENABLE          (1 << 0)
+/* Data transfer direction - 0: controller to card 1:card to controller */
+#define MMC_BOOT_MCI_DATA_DIR             (1 << 1)
+/* Data transfer mode - 0: block data transfer 1: stream data transfer */
+#define MMC_BOOT_MCI_DATA_MODE            (1 << 2)
+/* Enable DM interface - 0: DM disabled 1: DM enabled */
+#define MMC_BOOT_MCI_DATA_DM_ENABLE       (1 << 3)
+/* Data block length in bytes (1-4096) */
+#define MMC_BOOT_MCI_BLKSIZE_POS          4
+#define MMC_BOOT_MCI_DATA_COUNT            0x030
+#define MMC_BOOT_MCI_STATUS                0x034
+/* Command response received - CRC check failed */
+#define MMC_BOOT_MCI_STAT_CMD_CRC_FAIL    (1 << 0)
+/* Data block sent/received - CRC check failed */
+#define MMC_BOOT_MCI_STAT_DATA_CRC_FAIL   (1 << 1)
+/* Command resonse timeout */
+#define MMC_BOOT_MCI_STAT_CMD_TIMEOUT     (1 << 2)
+/* Data timeout */
+#define MMC_BOOT_MCI_STAT_DATA_TIMEOUT    (1 << 3)
+/* Transmit FIFO underrun error */
+#define MMC_BOOT_MCI_STAT_TX_UNDRUN       (1 << 4)
+/* Receive FIFO overrun error */
+#define MMC_BOOT_MCI_STAT_RX_OVRRUN       (1 << 5)
+/* Command response received - CRC check passed */
+#define MMC_BOOT_MCI_STAT_CMD_RESP_END    (1 << 6)
+/* Command sent - no response required */
+#define MMC_BOOT_MCI_STAT_CMD_SENT        (1 << 7)
+/* Data end - data counter zero */
+#define MMC_BOOT_MCI_STAT_DATA_END        (1 << 8)
+/* Start bit not detected on all data signals in wide bus mode */
+#define MMC_BOOT_MCI_STAT_START_BIT_ERR   (1 << 9)
+/* Data block sent/received - CRC check passed */
+#define MMC_BOOT_MCI_STAT_DATA_BLK_END    (1 << 10)
+/* Command transfer in progress */
+#define MMC_BOOT_MCI_STAT_CMD_ACTIVE      (1 << 11)
+/* Data transmit in progress */
+#define MMC_BOOT_MCI_STAT_TX_ACTIVE       (1 << 12)
+/* Data receive in progress */
+#define MMC_BOOT_MCI_STAT_RX_ACTIVE       (1 << 13)
+/* Transmit FIFO half full */
+#define MMC_BOOT_MCI_STAT_TX_FIFO_HFULL   (1 << 14)
+/* Receive FIFO half full */
+#define MMC_BOOT_MCI_STAT_RX_FIFO_HFULL   (1 << 15)
+/* Transmit FIFO full */
+#define MMC_BOOT_MCI_STAT_TX_FIFO_FULL    (1 << 16)
+/* Receive FIFO full */
+#define MMC_BOOT_MCI_STAT_RX_FIFO_FULL    (1 << 17)
+/* Transmit FIFO empty */
+#define MMC_BOOT_MCI_STAT_TX_FIFO_EMPTY   (1 << 18)
+/* Receive FIFO empty */
+#define MMC_BOOT_MCI_STAT_RX_FIFO_EMPTY   (1 << 19)
+/* Data available in transmit FIFO */
+#define MMC_BOOT_MCI_STAT_TX_DATA_AVLBL   (1 << 20)
+/* Data available in receive FIFO */
+#define MMC_BOOT_MCI_STAT_RX_DATA_AVLBL   (1 << 21)
+/* SDIO interrupt indicator for wake-up */
+#define MMC_BOOT_MCI_STAT_SDIO_INTR       (1 << 22)
+/* Programming done */
+#define MMC_BOOT_MCI_STAT_PROG_DONE       (1 << 23)
+/* CE-ATA command completion signal detected */
+#define MMC_BOOT_MCI_STAT_ATA_CMD_CMPL    (1 << 24)
+/* SDIO interrupt indicator for normal operation */
+#define MMC_BOOT_MCI_STAT_SDIO_INTR_OP    (1 << 25)
+/* Commpand completion signal timeout */
+#define MMC_BOOT_MCI_STAT_CCS_TIMEOUT     (1 << 26)
+
+#define MMC_BOOT_MCI_STATIC_STATUS        (MMC_BOOT_MCI_STAT_CMD_CRC_FAIL| \
+		MMC_BOOT_MCI_STAT_DATA_CRC_FAIL| \
+		MMC_BOOT_MCI_STAT_CMD_TIMEOUT| \
+		MMC_BOOT_MCI_STAT_DATA_TIMEOUT| \
+		MMC_BOOT_MCI_STAT_TX_UNDRUN| \
+		MMC_BOOT_MCI_STAT_RX_OVRRUN| \
+		MMC_BOOT_MCI_STAT_CMD_RESP_END| \
+		MMC_BOOT_MCI_STAT_CMD_SENT| \
+		MMC_BOOT_MCI_STAT_DATA_END| \
+		MMC_BOOT_MCI_STAT_START_BIT_ERR| \
+		MMC_BOOT_MCI_STAT_DATA_BLK_END| \
+		MMC_BOOT_MCI_SDIO_INTR_CLR| \
+		MMC_BOOT_MCI_STAT_PROG_DONE| \
+		MMC_BOOT_MCI_STAT_ATA_CMD_CMPL |\
+		MMC_BOOT_MCI_STAT_CCS_TIMEOUT)
+
+#define MMC_BOOT_MCI_CLEAR                  0x038
+#define MMC_BOOT_MCI_CMD_CRC_FAIL_CLR     (1 << 0)
+#define MMC_BOOT_MCI_DATA_CRC_FAIL_CLR    (1 << 1)
+#define MMC_BOOT_MCI_CMD_TIMEOUT_CLR      (1 << 2)
+#define MMC_BOOT_MCI_DATA_TIMEOUT_CLR     (1 << 3)
+#define MMC_BOOT_MCI_TX_UNDERRUN_CLR      (1 << 4)
+#define MMC_BOOT_MCI_RX_OVERRUN_CLR       (1 << 5)
+#define MMC_BOOT_MCI_CMD_RESP_END_CLR     (1 << 6)
+#define MMC_BOOT_MCI_CMD_SENT_CLR         (1 << 7)
+#define MMC_BOOT_MCI_DATA_END_CLR         (1 << 8)
+#define MMC_BOOT_MCI_START_BIT_ERR_CLR    (1 << 9)
+#define MMC_BOOT_MCI_DATA_BLK_END_CLR     (1 << 10)
+#define MMC_BOOT_MCI_SDIO_INTR_CLR        (1 << 22)
+#define MMC_BOOT_MCI_PROG_DONE_CLR        (1 << 23)
+#define MMC_BOOT_MCI_ATA_CMD_COMPLR_CLR   (1 << 24)
+#define MMC_BOOT_MCI_CCS_TIMEOUT_CLR      (1 << 25)
+
+#define MMC_BOOT_MCI_INT_MASK0             0x03C
+#define MMC_BOOT_MCI_CMD_CRC_FAIL_MASK    (1 << 0)
+#define MMC_BOOT_MCI_DATA_CRC_FAIL_MASK   (1 << 1)
+#define MMC_BOOT_MCI_CMD_TIMEOUT_MASK     (1 << 2)
+#define MMC_BOOT_MCI_DATA_TIMEOUT_MASK    (1 << 3)
+#define MMC_BOOT_MCI_TX_OVERRUN_MASK      (1 << 4)
+#define MMC_BOOT_MCI_RX_OVERRUN_MASK      (1 << 5)
+#define MMC_BOOT_MCI_CMD_RESP_END_MASK    (1 << 6)
+#define MMC_BOOT_MCI_CMD_SENT_MASK        (1 << 7)
+#define MMC_BOOT_MCI_DATA_END_MASK        (1 << 8)
+#define MMC_BOOT_MCI_START_BIT_ERR_MASK   (1 << 9)
+#define MMC_BOOT_MCI_DATA_BLK_END_MASK    (1 << 10)
+#define MMC_BOOT_MCI_CMD_ACTIVE_MASK      (1 << 11)
+#define MMC_BOOT_MCI_TX_ACTIVE_MASK       (1 << 12)
+#define MMC_BOOT_MCI_RX_ACTIVE_MASK       (1 << 13)
+#define MMC_BOOT_MCI_TX_FIFO_HFULL_MASK   (1 << 14)
+#define MMC_BOOT_MCI_RX_FIFO_HFULL_MASK   (1 << 15)
+#define MMC_BOOT_MCI_TX_FIFO_FULL_MASK    (1 << 16)
+#define MMC_BOOT_MCI_RX_FIFO_FULL_MASK    (1 << 17)
+#define MMC_BOOT_MCI_TX_FIFO_EMPTY_MASK   (1 << 18)
+#define MMC_BOOT_MCI_RX_FIFO_EMPTY_MASK   (1 << 19)
+#define MMC_BOOT_MCI_TX_DATA_AVLBL_MASK   (1 << 20)
+#define MMC_BOOT_MCI_RX_DATA_AVLBL_MASK   (1 << 21)
+#define MMC_BOOT_MCI_SDIO_INT_MASK        (1 << 22)
+#define MMC_BOOT_MCI_PROG_DONE_MASK       (1 << 23)
+#define MMC_BOOT_MCI_ATA_CMD_COMPL_MASK   (1 << 24)
+#define MMC_BOOT_MCI_SDIO_INT_OPER_MASK   (1 << 25)
+#define MMC_BOOT_MCI_CCS_TIME_OUT_MASK    (1 << 26)
+
+#define MMC_BOOT_MCI_INT_MASK1              0x040
+
+#define MMC_BOOT_MCI_FIFO_COUNT            0x044
+
+#define MMC_BOOT_MCI_CCS_TIMER              0x0058
+
+#define MMC_BOOT_MCI_FIFO                   0x080
+
+/* OCR Register */
+#define MMC_BOOT_OCR_17_19                (1 << 7)
+#define MMC_BOOT_OCR_27_36                (0x1FF << 15)
+#define MMC_BOOT_OCR_SEC_MODE             (2 << 29)
+#define MMC_BOOT_OCR_BUSY                 (1 << 31)
+
+/* Commands type */
+#define MMC_BOOT_CMD_BCAST                (1 << 0)
+#define MMC_BOOT_CMD_BCAST_W_RESP         (1 << 1)
+#define MMC_BOOT_CMD_ADDRESS              (1 << 2)
+#define MMC_BOOT_CMD_ADDR_DATA_XFER       (1 << 3)
+
+/* Card Status bits (R1 register) */
+#define MMC_BOOT_R1_AKE_SEQ_ERROR         (1 << 3)
+#define MMC_BOOT_R1_APP_CMD               (1 << 5)
+#define MMC_BOOT_R1_RDY_FOR_DATA          (1 << 6)
+#define MMC_BOOT_R1_CURR_STATE_IDLE       (0 << 9)
+#define MMC_BOOT_R1_CURR_STATE_RDY        (1 << 9)
+#define MMC_BOOT_R1_CURR_STATE_IDENT      (2 << 9)
+#define MMC_BOOT_R1_CURR_STATE_STBY       (3 << 9)
+#define MMC_BOOT_R1_CURR_STATE_TRAN       (4 << 9)
+#define MMC_BOOT_R1_CURR_STATE_DATA       (5 << 9)
+#define MMC_BOOT_R1_CURR_STATE_RCV        (6 << 9)
+#define MMC_BOOT_R1_CURR_STATE_PRG        (7 << 9)
+#define MMC_BOOT_R1_CURR_STATE_DIS        (8 << 9)
+#define MMC_BOOT_R1_ERASE_RESET           (1 << 13)
+#define MMC_BOOT_R1_CARD_ECC_DISABLED     (1 << 14)
+#define MMC_BOOT_R1_WP_ERASE_SKIP         (1 << 15)
+#define MMC_BOOT_R1_ERROR                 (1 << 19)
+#define MMC_BOOT_R1_CC_ERROR              (1 << 20)
+#define MMC_BOOT_R1_CARD_ECC_FAILED       (1 << 21)
+#define MMC_BOOT_R1_ILLEGAL_CMD           (1 << 22)
+#define MMC_BOOT_R1_COM_CRC_ERR           (1 << 23)
+#define MMC_BOOT_R1_LOCK_UNLOCK_FAIL      (1 << 24)
+#define MMC_BOOT_R1_CARD_IS_LOCKED        (1 << 25)
+#define MMC_BOOT_R1_WP_VIOLATION          (1 << 26)
+#define MMC_BOOT_R1_ERASE_PARAM           (1 << 27)
+#define MMC_BOOT_R1_ERASE_SEQ_ERR         (1 << 28)
+#define MMC_BOOT_R1_BLOCK_LEN_ERR         (1 << 29)
+#define MMC_BOOT_R1_ADDR_ERR              (1 << 30)
+#define MMC_BOOT_R1_OUT_OF_RANGE          (1 << 31)
+
+/* Macros for Common Errors */
+#define MMC_BOOT_E_SUCCESS                0
+#define MMC_BOOT_E_FAILURE                1
+/* Not used..use instead TIMEOUT in include/mmc.h */
+#define MMC_BOOT_E_TIMEOUT                2
+#define MMC_BOOT_E_INVAL                  3
+#define MMC_BOOT_E_CRC_FAIL               4
+#define MMC_BOOT_E_INIT_FAIL              5
+#define MMC_BOOT_E_CMD_INDX_MISMATCH      6
+#define MMC_BOOT_E_RESP_VERIFY_FAIL       7
+#define MMC_BOOT_E_NOT_SUPPORTED          8
+#define MMC_BOOT_E_CARD_BUSY              9
+#define MMC_BOOT_E_MEM_ALLOC_FAIL         10
+#define MMC_BOOT_E_CLK_ENABLE_FAIL        11
+#define MMC_BOOT_E_CMMC_DECODE_FAIL       12
+#define MMC_BOOT_E_CID_DECODE_FAIL        13
+#define MMC_BOOT_E_BLOCKLEN_ERR           14
+#define MMC_BOOT_E_ADDRESS_ERR            15
+#define MMC_BOOT_E_DATA_CRC_FAIL          16
+#define MMC_BOOT_E_DATA_TIMEOUT           17
+#define MMC_BOOT_E_RX_OVRRUN              18
+#define MMC_BOOT_E_VREG_SET_FAILED        19
+#define MMC_BOOT_E_GPIO_CFG_FAIL          20
+#define MMC_BOOT_E_DATA_ADM_ERR           21
+
+/* EXT_CSD */
+#define MMC_BOOT_ACCESS_WRITE             0x3
+#define MMC_BOOT_EXT_CMMC_HS_TIMING       185
+#define MMC_BOOT_EXT_CMMC_BUS_WIDTH       183
+
+#define MMC_BOOT_EXT_USER_WP              171
+#define MMC_BOOT_EXT_ERASE_GROUP_DEF      175
+#define MMC_BOOT_EXT_HC_WP_GRP_SIZE       221
+#define MMC_BOOT_EXT_HC_ERASE_GRP_SIZE    224
+
+#define MMC_BOOT_US_PERM_WP_EN            2
+#define MMC_BOOT_US_PWR_WP_DIS            3
+
+#define MMC_BOOT_US_PERM_WP_DIS           (1<<4)
+#define MMC_BOOT_US_PWR_WP_EN             1
+
+/* For SD */
+#define MMC_BOOT_SD_HC_VOLT_SUPPLIED      0x000001AA
+#define MMC_BOOT_SD_NEG_OCR               0x00FF8000
+#define MMC_BOOT_SD_HC_HCS                0x40000000
+#define MMC_BOOT_SD_DEV_READY             0x80000000
+#define MMC_BOOT_SD_SWITCH_HS             0x80FFFFF1
+
+/* Data structure definitions */
+
+#define MMC_BOOT_XFER_MODE_BLOCK          0
+#define MMC_BOOT_XFER_MODE_STREAM         1
+#define MMC_BOOT_PROGRAM_ENABLED          2
+
+
+#define MMC_RCA 2
+
+#define MMC_BOOT_MAX_COMMAND_RETRY    1000
+#define MMC_BOOT_RD_BLOCK_LEN         512
+#define MMC_BOOT_WR_BLOCK_LEN         512
+
+/* We have 16 32-bits FIFO registers */
+#define MMC_BOOT_MCI_FIFO_DEPTH       16
+#define MMC_BOOT_MCI_HFIFO_COUNT      (MMC_BOOT_MCI_FIFO_DEPTH / 2)
+#define MMC_BOOT_MCI_FIFO_SIZE        (MMC_BOOT_MCI_FIFO_DEPTH * 4)
+
+#define MAX_PARTITIONS 64
+
+#define MMC_BOOT_CHECK_PATTERN        0xAA /* 10101010b */
+
+#define MMC_CLK_400KHZ                400000
+#define MMC_CLK_144KHZ                144000
+#define MMC_CLK_20MHZ                 20000000
+#define MMC_CLK_24MHZ                 24000000
+#define MMC_CLK_25MHZ                 25000000
+#define MMC_CLK_26MHZ                 26000000
+#define MMC_CLK_48MHZ                 48000000
+#define MMC_CLK_50MHZ                 49152000
+#define MMC_CLK_52MHZ                 52000000
+
+#define MMC_CLK_ENABLE      1
+#define MMC_CLK_DISABLE     0
+
+struct mmc_priv {
+	unsigned int instance;
+	unsigned int base;
+	unsigned int rd_timeout_ns;	/* for read timeout */
+};
+
+void mmc_boot_set_ios(struct mmc *mmc);
+int mmc_boot_send_command_map(struct mmc *mmc,
+					struct mmc_cmd *cmd,
+					struct mmc_data *data);
+unsigned long int mmc_boot_mci_reg(unsigned long base, unsigned long offset);
+unsigned int mmc_boot_main(struct mmc *mmc);
+
+extern void clock_config_mmc(uint32_t interface, uint32_t freq);
+extern void clock_init_mmc(uint32_t interface);
+#endif
+
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 506f1d6..2d926ec 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -44,6 +44,7 @@  COBJS-$(CONFIG_S5P_MMC) += s5p_mmc.o
 COBJS-$(CONFIG_SDHCI) += sdhci.o
 COBJS-$(CONFIG_SH_MMCIF) += sh_mmcif.o
 COBJS-$(CONFIG_TEGRA2_MMC) += tegra2_mmc.o
+COBJS-$(CONFIG_QC_MMC) += qc_mmc.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/drivers/mmc/qc_mmc.c b/drivers/mmc/qc_mmc.c
new file mode 100644
index 0000000..db7637c
--- /dev/null
+++ b/drivers/mmc/qc_mmc.c
@@ -0,0 +1,581 @@ 
+/*
+ * (C) Copyright 2012
+ * LARSEN AND TOUBRO INFOTECH LTD <www.lntinfotech.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/types.h>
+#include <asm/io.h>
+#include <asm/arch/mmc.h>
+#include <asm/arch/iomap.h>
+#include <common.h>
+
+#if MMC_BOOT_ADM
+#include "adm.h"
+#endif
+
+
+#define MMC_BOOT_DATA_READ     0
+#define MMC_BOOT_DATA_WRITE    1
+/*
+ * Calculates the address of registers according to the base address
+ */
+unsigned long int mmc_boot_mci_reg(unsigned long base, unsigned long offset)
+{
+	return base + offset;
+}
+
+
+/*
+ * Sets a timeout for read operation.
+ */
+static unsigned int mmc_boot_set_read_timeout(struct mmc *mmc)
+{
+	if (mmc == NULL)
+		return MMC_BOOT_E_INVAL;
+
+	/* todo: Add a check for HC, only if HC do this.
+	 * If not, taac and nsac must be taken into account
+	 */
+	struct mmc_priv *priv = mmc->priv;
+	priv->rd_timeout_ns = 100000000;
+	debug(" Read timeout set: %d ns\n",
+	priv->rd_timeout_ns);
+
+	return MMC_BOOT_E_SUCCESS;
+}
+
+/*
+ * Check to ensure that there is no alignment or data length errors
+ */
+static unsigned int mmc_boot_check_read_data(struct mmc_cmd *cmd)
+{
+
+	if (cmd->response[0] & MMC_BOOT_R1_BLOCK_LEN_ERR)
+		return MMC_BOOT_E_BLOCKLEN_ERR;
+
+	/* Misaligned address not matching block length */
+	if (cmd->response[0] & MMC_BOOT_R1_ADDR_ERR)
+		return MMC_BOOT_E_ADDRESS_ERR;
+
+	return MMC_BOOT_E_SUCCESS;
+}
+
+/*
+ * Decode type of error caused during read and write
+ */
+static unsigned int mmc_boot_status_error(unsigned mmc_status)
+{
+	unsigned int mmc_ret = MMC_BOOT_E_SUCCESS;
+
+		/* If DATA_CRC_FAIL bit is set to 1 then CRC error
+		 * was detected by card/device during the data transfer
+		 */
+	if (mmc_status & MMC_BOOT_MCI_STAT_DATA_CRC_FAIL)
+		mmc_ret = MMC_BOOT_E_DATA_CRC_FAIL;
+		/* If DATA_TIMEOUT bit is set to 1 then the data transfer time
+		 * exceeded the data timeout period without completing the
+		 * transfer
+		 */
+	else if (mmc_status & MMC_BOOT_MCI_STAT_DATA_TIMEOUT)
+		mmc_ret = MMC_BOOT_E_DATA_TIMEOUT;
+		/* If RX_OVERRUN bit is set to 1 then SDCC2 tried to
+		 * receive data from the card before empty storage for new
+		 * received data was available.
+		 * Verify that bit FLOW_ENA in MCI_CLK is set to 1 during
+		 * the data xfer.
+		 */
+	else if (mmc_status & MMC_BOOT_MCI_STAT_RX_OVRRUN)
+		/* Note: We've set FLOW_ENA bit in MCI_CLK to 1.
+		 * so no need to verify for now
+		 */
+		mmc_ret = MMC_BOOT_E_RX_OVRRUN;
+		/* If TX_UNDERRUN bit is set to 1 then SDCC2 tried to send
+		 * data to the card before new data for sending was available.
+		 * Verify that bit FLOW_ENA in MCI_CLK
+		 * is set to 1 during the data xfer.
+		 */
+	else if (mmc_status & MMC_BOOT_MCI_STAT_TX_UNDRUN)
+		/* Note: We've set FLOW_ENA bit in MCI_CLK to 1.
+		 * so skipping it now
+		 */
+		mmc_ret = MMC_BOOT_E_RX_OVRRUN;
+
+	return mmc_ret;
+}
+
+/*
+ * Read data to SDC FIFO.
+ */
+static unsigned int mmc_boot_fifo_read(u32 *mmc_ptr,
+						unsigned int  data_len,
+						struct mmc *mmc)
+{
+	unsigned int mmc_ret = MMC_BOOT_E_SUCCESS;
+	unsigned int mmc_status = 0;
+	unsigned int mmc_count = 0;
+	unsigned int read_error = MMC_BOOT_MCI_STAT_DATA_CRC_FAIL | \
+					MMC_BOOT_MCI_STAT_DATA_TIMEOUT  | \
+					MMC_BOOT_MCI_STAT_RX_OVRRUN;
+	unsigned int i;
+	struct mmc_priv *priv = mmc->priv;
+	unsigned long reg_status, reg_fifo;
+
+	reg_status = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_STATUS);
+	reg_fifo = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_FIFO);
+
+	/* Read the data from the MCI_FIFO register as long as
+	 * RXDATA_AVLBL bit of MCI_STATUS register is set to 1 and bits
+	 * DATA_CRC_FAIL, DATA_TIMEOUT, RX_OVERRUN of MCI_STATUS
+	 * register are cleared to 0.
+	 * Continue the reads until the whole transfer data is received
+	 */
+
+	do {
+		mmc_ret = MMC_BOOT_E_SUCCESS;
+		mmc_status = readl(reg_status);
+
+		if (mmc_status & read_error) {
+			mmc_ret = mmc_boot_status_error(mmc_status);
+			break;
+		}
+
+		if (mmc_status & MMC_BOOT_MCI_STAT_RX_DATA_AVLBL) {
+			unsigned read_count = 1;
+			if (mmc_status & MMC_BOOT_MCI_STAT_RX_FIFO_HFULL)
+				read_count = MMC_BOOT_MCI_HFIFO_COUNT;
+
+			for (i = 0; i < read_count; i++) {
+				/* FIFO contains 16 32-bit data buffer
+				  * on 16 sequential addresses
+				  */
+				*mmc_ptr = readl(reg_fifo +
+					(mmc_count % MMC_BOOT_MCI_FIFO_SIZE));
+				mmc_ptr++;
+				/* increase mmc_count by amount od data read */
+				mmc_count += sizeof(*mmc_ptr);
+			}
+			/* quit if we have read enough of data */
+			if (mmc_count == data_len)
+				break;
+		} else if (mmc_status & MMC_BOOT_MCI_STAT_DATA_END)
+			break;
+	}  while (1);
+	return mmc_ret;
+}
+
+static unsigned int mmc_boot_fifo_data_transfer(unsigned int *data_ptr,
+							unsigned int  data_len,
+							unsigned char direction,
+							struct mmc *mmc)
+{
+	unsigned int mmc_ret = MMC_BOOT_E_SUCCESS;
+
+	if (direction == MMC_BOOT_DATA_READ)
+		mmc_ret = mmc_boot_fifo_read(data_ptr, data_len, mmc);
+
+	return mmc_ret;
+}
+
+/*
+ * Sends specified command to a card and waits for a response.
+ */
+static unsigned int mmc_boot_send_command(struct mmc_cmd *cmd,
+						struct mmc *mmc)
+{
+	unsigned int mmc_cmd = 0;
+	unsigned int mmc_status = 0;
+	unsigned int mmc_resp = 0;
+	unsigned int mmc_return = MMC_BOOT_E_SUCCESS;
+	unsigned int cmd_index = 0;
+	int i = 0;
+	unsigned long reg, reg_status, reg_resp_cmd, reg_resp_0;
+	struct mmc_priv *priv = mmc->priv;
+
+	/* basic check */
+	if (cmd == NULL)
+		return MMC_BOOT_E_INVAL;
+
+		/* 1. Write command argument to MMC_BOOT_MCI_ARGUMENT register */
+	reg = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_ARGUMENT);
+		writel(cmd->cmdarg, reg);
+
+	/* Writes to MCI port are not effective for 3 ticks of PCLK.
+	 * ticks calculated using 400KHz clock speed
+	 */
+	udelay(8);
+
+	/* 2. Set appropriate fields and write MMC_BOOT_MCI_CMD */
+	/* 2a. Write command index in CMD_INDEX field */
+	cmd_index = cmd->cmdidx;
+	mmc_cmd |= cmd->cmdidx;
+	/* 2b. Set RESPONSE bit to 1 for all cmds except CMD0 */
+	if (cmd_index != MMC_CMD_GO_IDLE_STATE)
+		mmc_cmd |= MMC_BOOT_MCI_CMD_RESPONSE;
+
+	/* 2c. Set LONGRESP bit to 1 for CMD2, CMD9 and CMD10 */
+	if (cmd->resp_type & MMC_RSP_136)
+		mmc_cmd |= MMC_BOOT_MCI_CMD_LONGRSP;
+
+	/* 2d. Set INTERRUPT bit to 1 to disable command timeout */
+
+	/* 2e. Set PENDING bit to 1 for CMD12 in the beginning of stream
+	 * mode data transfer
+	 */
+	if (cmd->flags & MMC_BOOT_XFER_MODE_STREAM)
+		mmc_cmd |= MMC_BOOT_MCI_CMD_PENDING;
+
+	/* 2f. Set ENABLE bit to 1 */
+	mmc_cmd |= MMC_BOOT_MCI_CMD_ENABLE;
+
+	/* 2g. Set PROG_ENA bit to 1 for CMD12, CMD13 issued at the end of
+	 * write data transfer
+	 */
+	if ((cmd_index == MMC_CMD_STOP_TRANSMISSION ||
+			cmd_index == MMC_CMD_SEND_STATUS) &&
+			(cmd->flags & MMC_BOOT_PROGRAM_ENABLED))
+			mmc_cmd |= MMC_BOOT_MCI_CMD_PROG_ENA;
+
+
+	/* 2h. Set MCIABORT bit to 1 for CMD12 when working with SDIO card */
+	/* 2i. Set CCS_ENABLE bit to 1 for CMD61 when Command Completion Signal
+	 * of CE-ATA device is enabled
+	 */
+
+	/* 2j. clear all static status bits */
+	reg = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_CLEAR);
+	writel(MMC_BOOT_MCI_STATIC_STATUS, reg);
+
+	/* 2k. Write to MMC_BOOT_MCI_CMD register */
+	reg = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_CMD);
+	writel(mmc_cmd, reg);
+
+	/* Writes to MCI port are not effective for 3 ticks of PCLK.
+	 * ticks calculated using 400KHz clock speed
+	 */
+	udelay(8);
+
+	reg_status = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_STATUS);
+	reg_resp_cmd = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_RESP_CMD);
+	reg_resp_0 = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_RESP_0);
+
+	/* 3. Wait for interrupt or poll on the following bits of MCI_STATUS
+	 * register
+	 */
+	do {
+		/* 3a. Read MCI_STATUS register */
+		mmc_status = readl(reg_status);
+		while (mmc_status & MMC_BOOT_MCI_STAT_CMD_ACTIVE)
+			mmc_status = readl(reg_status);
+
+		/* 3b. CMD_SENT bit supposed to be set to 1 only
+		  * after CMD0 is sent -no response required.
+		  */
+		if ((cmd->resp_type == MMC_RSP_NONE) &&
+				(mmc_status & MMC_BOOT_MCI_STAT_CMD_SENT))
+			break;
+
+		/* 3c. If CMD_TIMEOUT bit is set then no response
+		  * was received */
+		else if (mmc_status & MMC_BOOT_MCI_STAT_CMD_TIMEOUT) {
+			mmc_return = TIMEOUT;
+			break;
+		}
+		/* 3d. If CMD_RESPONSE_END bit is set to 1 then command's
+		  * response was received and CRC check passed
+		  * Spcial case for ACMD41: it seems to always fail CRC even if
+		  * the response is valid
+		  */
+		else if ((mmc_status & MMC_BOOT_MCI_STAT_CMD_RESP_END) ||
+				(cmd_index == MMC_CMD_SEND_OP_COND)
+				|| (cmd_index == SD_CMD_SEND_IF_COND)) {
+			/* 3i. Read MCI_RESP_CMD register to verify that
+			  *  response index is equal to command index
+			  */
+			mmc_resp = readl(reg_resp_cmd) & 0x3F;
+
+			/* However, long response does not contain the
+			 * command index field.
+			 * In that case, response index field must be set to
+			 * 111111b (0x3F)
+			 */
+			if ((mmc_resp == cmd_index) ||
+				(cmd->resp_type == MMC_RSP_R2 ||
+				cmd->resp_type == MMC_RSP_R3 ||
+				cmd->resp_type == MMC_RSP_R6 ||
+				cmd->resp_type == MMC_RSP_R7)){
+				/* 3j. If resp index is equal to cmd index,
+				  * read command resp from MCI_RESPn registers
+				  * - MCI_RESP0/1/2/3 for CMD2/9/10
+				  * - MCI_RESP0 for all other registers
+				  */
+				if (cmd->resp_type & MMC_RSP_136) {
+					for (i = 0; i < 4; i++)
+						cmd->response[3-i] =
+							readl(reg_resp_0 + \
+							(i * 4));
+				} else
+					cmd->response[0] = readl(reg_resp_0);
+			} else
+				/* command index mis-match */
+				mmc_return = MMC_BOOT_E_CMD_INDX_MISMATCH;
+
+			break;
+		}
+
+		/* 3e. If CMD_CRC_FAIL bit is set to 1 then cmd's response
+		 * was recvd, but CRC check failed.
+		 */
+		else if ((mmc_status & MMC_BOOT_MCI_STAT_CMD_CRC_FAIL)) {
+			if (cmd_index == SD_CMD_APP_SEND_OP_COND)
+				cmd->response[0] = readl(reg_resp_0);
+			else
+				mmc_return = MMC_BOOT_E_CRC_FAIL;
+			break;
+		}
+
+	}  while (1);
+
+	return mmc_return;
+}
+
+static void mmc_boot_init_data(struct mmc *mmc, struct mmc_cmd *cmd,
+			struct mmc_data *data)
+{
+	uint32_t data_ctrl, mmc_reg, data_len;
+	struct mmc_priv *priv = mmc->priv;
+	unsigned long reg;
+
+	/* Write data timeout period to MCI_DATA_TIMER register. */
+	/* Data timeout period should be in card bus clock periods */
+	mmc_reg = (unsigned long)(priv->rd_timeout_ns /
+						1000000) * (mmc->clock / 1000);
+	/* add some extra clock cycles to be safe */
+	mmc_reg += 1000;
+	mmc_reg = mmc_reg/2;
+
+	reg = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_DATA_TIMER);
+	writel(mmc_reg, reg);
+
+	/* Write the total size of the transfer data to MCI_DATA_LENGTH
+	 * register. For block xfer it must be multiple of the block
+	 * size.
+	 */
+
+	data_len = data->blocks*data->blocksize;
+	reg = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_DATA_LENGTH);
+	writel(data_len, reg);
+
+	/* Writes to MCI port are not effective for 3 ticks of PCLK.
+	 * ticks calculated using 400KHz clock speed
+	 */
+	udelay(8);
+
+	data_ctrl = MMC_BOOT_MCI_DATA_ENABLE |
+		(data->blocksize << MMC_BOOT_MCI_BLKSIZE_POS);
+
+
+	if (data->flags == MMC_DATA_READ)
+		data_ctrl |= MMC_BOOT_MCI_DATA_DIR;
+
+	reg = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_DATA_CTL);
+	writel(data_ctrl, reg);
+
+	/* Writes to MCI port are not effective for 3 ticks of PCLK.
+	 * ticks calculated using 400KHz clock speed
+	 */
+	udelay(8);
+
+}
+
+/*
+ * Function to map mmc send command to board send command
+ */
+int mmc_boot_send_command_map(struct mmc *mmc,
+				struct mmc_cmd *cmd,
+				struct mmc_data *data)
+{
+	unsigned int mmc_ret = MMC_BOOT_E_SUCCESS;
+
+	/*  todo: do we need to fill in command type ?? */
+
+	if (cmd->cmdidx == MMC_CMD_SEND_STATUS) {
+		/* u-boot doesn't fill in the correct argument value */
+		cmd->cmdarg =  mmc->rca << 16;
+		/* this is to explicitly disable the prg enabled flag */
+		cmd->flags &= ~MMC_BOOT_PROGRAM_ENABLED;
+
+	} else if (cmd->cmdidx == MMC_CMD_READ_SINGLE_BLOCK) {
+		if (mmc->read_bl_len != MMC_BOOT_RD_BLOCK_LEN &&
+				mmc->version & SD_VERSION_SD) {
+			mmc->read_bl_len = MMC_BOOT_RD_BLOCK_LEN;
+			data->blocksize = MMC_BOOT_RD_BLOCK_LEN;
+		}
+	} else if (cmd->cmdidx == MMC_CMD_READ_MULTIPLE_BLOCK) {
+			if (mmc->read_bl_len != MMC_BOOT_RD_BLOCK_LEN &&
+					mmc->version & SD_VERSION_SD) {
+				mmc->read_bl_len = MMC_BOOT_RD_BLOCK_LEN;
+				data->blocksize = MMC_BOOT_RD_BLOCK_LEN;
+			}
+	} else if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION) {
+			/* explicitly disable the prg enabled flag */
+			cmd->flags &= ~MMC_BOOT_PROGRAM_ENABLED;
+			/* set the XFER mode */
+			cmd->flags |= MMC_BOOT_XFER_MODE_BLOCK;
+	}
+
+
+	/* For Data cmd's */
+	if (data != NULL)
+		mmc_boot_init_data(mmc, cmd, data);
+
+	/* send command */
+	mmc_ret = mmc_boot_send_command(cmd, mmc);
+
+	if (mmc_ret != MMC_BOOT_E_SUCCESS) {
+		debug("Return Error = %d\n", mmc_ret);
+		return mmc_ret;
+	}
+
+	if (data != NULL) {
+		mmc_ret = mmc_boot_check_read_data(cmd);
+		if (mmc_ret)
+			return mmc_ret;
+		mmc_boot_fifo_data_transfer((unsigned int *) data->dest,
+					data->blocks * data->blocksize,
+					MMC_BOOT_DATA_READ,
+					mmc);
+	}
+
+	if (cmd->cmdidx == MMC_CMD_SEND_CSD) {
+		/* Set read timeout once csd is received */
+		mmc_ret = mmc_boot_set_read_timeout(mmc);
+		if (mmc_ret != MMC_BOOT_E_SUCCESS) {
+			printf("Error No.%d: Failure setting \
+					write Timeout value!\n",
+					mmc_ret);
+			return mmc_ret;
+		}
+	} else if ((cmd->cmdidx == SD_CMD_SWITCH_FUNC) && (data != NULL)) {
+		/* cmd6 needs at least 8 clocks after the
+		 * End Data of Status.
+		 * ticks calculated using 400KHz clock speed
+		 */
+		udelay(20);
+	}
+
+	return mmc_ret;
+}
+
+/*
+ * Initialize host structure, set and enable clock-rate and power mode.
+ */
+unsigned int mmc_boot_init(struct mmc *mmc)
+{
+	unsigned int mmc_pwr = 0;
+	struct mmc_priv *priv = mmc->priv;
+	int mmc_slot = priv->instance;
+	unsigned long reg;
+
+	/* Initialize any clocks needed for SDC controller */
+	clock_init_mmc(mmc_slot);
+
+	/* Setup initial freq to 400KHz */
+	clock_config_mmc(mmc_slot, MMC_CLK_400KHZ);
+
+	/* set power mode*/
+	mmc_pwr &= ~MMC_BOOT_MCI_PWR_UP;
+	mmc_pwr |= MMC_BOOT_MCI_PWR_ON;
+	mmc_pwr |= MMC_BOOT_MCI_PWR_UP;
+	reg = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_POWER);
+	writel(mmc_pwr, reg);
+
+	/* Writes to MCI port are not effective for 3 ticks of PCLK.
+	 * ticks calculated using 400KHz clock speed
+	 */
+	udelay(8);
+
+	return MMC_BOOT_E_SUCCESS;
+}
+
+static unsigned int mmc_boot_set_bus_width(unsigned int width,
+						struct mmc *mmc)
+{
+	unsigned int mmc_reg;
+	struct mmc_priv *priv = mmc->priv;
+	unsigned long reg;
+
+	/* set MCI_CLK accordingly */
+	reg = mmc_boot_mci_reg(priv->base, MMC_BOOT_MCI_CLK);
+	mmc_reg = readl(reg);
+	mmc_reg &= ~MMC_BOOT_MCI_CLK_WIDEBUS_MODE;
+	if (width == 1)
+		mmc_reg |=  MMC_BOOT_MCI_CLK_WIDEBUS_1_BIT;
+	else if (width == 4)
+		mmc_reg |=  MMC_BOOT_MCI_CLK_WIDEBUS_4_BIT;
+	else if (width == 8)
+		mmc_reg |=  MMC_BOOT_MCI_CLK_WIDEBUS_8_BIT;
+	else
+		return MMC_BOOT_E_INVAL;
+
+	writel(mmc_reg, reg);
+
+	/* Writes to MCI port are not effective for 3 ticks of PCLK.
+	 * ticks calculated using 400KHz clock speed
+	 */
+	udelay(8);
+
+	debug("Setting bus width to %d\n", width);
+	return MMC_BOOT_E_SUCCESS;
+}
+
+void mmc_boot_set_ios(struct mmc *mmc)
+{
+	unsigned int mmc_ret = MMC_BOOT_E_SUCCESS;
+	struct mmc_priv *priv = mmc->priv;
+	int mmc_slot = priv->instance;
+
+	/* clock frequency should be less than 400KHz in identification mode */
+	clock_config_mmc(mmc_slot, mmc->clock);
+	/*
+	 * give atleast 2 MCLK cycles delay for clocks
+	 * and SDCC core to stabilize.
+	 * ticks calculated using 400KHz clock speed
+	 */
+	udelay(5);
+	mmc_ret = mmc_boot_set_bus_width(mmc->bus_width, mmc);
+	if (mmc_ret != MMC_BOOT_E_SUCCESS)
+		printf("Set bus width error %d\n", mmc_ret);
+}
+
+/*
+ * Board specific initializations
+ */
+unsigned int mmc_boot_main(struct mmc *mmc)
+{
+	unsigned int mmc_ret = MMC_BOOT_E_SUCCESS;
+
+	/* Initialize necessary data structure and enable/set clock and power */
+	debug(" Initializing MMC host data structure and clock!\n");
+	mmc_ret = mmc_boot_init(mmc);
+	if (mmc_ret != MMC_BOOT_E_SUCCESS) {
+		printf("MMC Boot: Error Initializing MMC Card!!!\n");
+		return MMC_BOOT_E_FAILURE;
+	}
+
+	return MMC_BOOT_E_SUCCESS;
+}