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mmc.c

/*
 * (C) Copyright 2008
 * Texas Instruments, <www.ti.com>
 * Syed Mohammed Khasim <khasim@ti.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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's version 2 of
 * the License.
 *
 * 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 <config.h>
#include <common.h>
#include <mmc.h>
#include <part.h>

#ifdef CFG_CMD_MMC

#include "mmc_host_def.h"
#include "mmc_protocol.h"

#define OMAP_MMC_MASTER_CLOCK   96000000
extern int fat_register_device(block_dev_desc_t *dev_desc, int part_no);

mmc_card_data cur_card_data;
static block_dev_desc_t mmc_blk_dev;

block_dev_desc_t *mmc_get_dev(int dev)
{
      return ((block_dev_desc_t *) &mmc_blk_dev);
}

unsigned char mmc_board_init(void)
{
      unsigned int value = 0;

      value = CONTROL_PBIAS_LITE;
      CONTROL_PBIAS_LITE = value | (1 << 2) | (1 << 1) | (1 << 9);

      value = CONTROL_DEV_CONF0;
      CONTROL_DEV_CONF0 = value | (1 << 24);

      return 1;
}

void mmc_init_stream(void)
{
      OMAP_HSMMC_CON |= INIT_INITSTREAM;

      OMAP_HSMMC_CMD = MMC_CMD0;
      while (!(OMAP_HSMMC_STAT & CC_MASK));

      OMAP_HSMMC_STAT = CC_MASK;

      OMAP_HSMMC_CMD = MMC_CMD0;
      while (!(OMAP_HSMMC_STAT & CC_MASK));


      OMAP_HSMMC_STAT = OMAP_HSMMC_STAT;
      OMAP_HSMMC_CON &= ~INIT_INITSTREAM;
}

unsigned char mmc_clock_config(unsigned int iclk, unsigned short clk_div)
{
      unsigned int val;

      mmc_reg_out(OMAP_HSMMC_SYSCTL, (ICE_MASK | DTO_MASK | CEN_MASK),
                (ICE_STOP | DTO_15THDTO | CEN_DISABLE));

      switch (iclk) {
      case CLK_INITSEQ:
            val = MMC_INIT_SEQ_CLK / 2;
            break;
      case CLK_400KHZ:
            val = MMC_400kHz_CLK;
            break;
      case CLK_MISC:
            val = clk_div;
            break;
      default:
            return 0;
      }
      mmc_reg_out(OMAP_HSMMC_SYSCTL,
                ICE_MASK | CLKD_MASK, (val << CLKD_OFFSET) | ICE_OSCILLATE);

      while ((OMAP_HSMMC_SYSCTL & ICS_MASK) == ICS_NOTREADY);


      OMAP_HSMMC_SYSCTL |= CEN_ENABLE;
      return 1;
}

unsigned char mmc_init_setup(void)
{
      unsigned int reg_val;
      unsigned int val = 0;

      mmc_board_init();

      OMAP_HSMMC_SYSCONFIG |= MMC_SOFTRESET;
      while ((OMAP_HSMMC_SYSSTATUS & RESETDONE) == 0) ;

      OMAP_HSMMC_SYSCTL |= SOFTRESETALL;
      while ((OMAP_HSMMC_SYSCTL & SOFTRESETALL) != 0x0) ;

      OMAP_HSMMC_HCTL = DTW_1_BITMODE | SDBP_PWROFF | SDVS_3V0;
      OMAP_HSMMC_CAPA |= VS30_3V0SUP | VS18_1V8SUP;

      reg_val = OMAP_HSMMC_CON & RESERVED_MASK;

      OMAP_HSMMC_CON = CTPL_MMC_SD | reg_val | WPP_ACTIVEHIGH |
          CDP_ACTIVEHIGH | MIT_CTO | DW8_1_4BITMODE | MODE_FUNC |
          STR_BLOCK | HR_NOHOSTRESP | INIT_NOINIT | NOOPENDRAIN;

      mmc_clock_config(CLK_INITSEQ, 0);
      OMAP_HSMMC_HCTL |= SDBP_PWRON;

      OMAP_HSMMC_IE = 0x307f0033;

      mmc_init_stream();
      return 1;
}

unsigned char mmc_send_cmd(unsigned int cmd, unsigned int arg,
                     unsigned int *response)
{
      unsigned int mmc_stat;

      while ((OMAP_HSMMC_PSTATE & DATI_MASK) == DATI_CMDDIS);


      OMAP_HSMMC_BLK = BLEN_512BYTESLEN | NBLK_STPCNT;
      OMAP_HSMMC_STAT = 0xFFFFFFFF;
      OMAP_HSMMC_ARG = arg;
      OMAP_HSMMC_CMD = cmd | CMD_TYPE_NORMAL | CICE_NOCHECK |
          CCCE_NOCHECK | MSBS_SGLEBLK | ACEN_DISABLE | BCE_DISABLE |
          DE_DISABLE;

      while (1) {
            do {
                  mmc_stat = OMAP_HSMMC_STAT;
            } while (mmc_stat == 0);

            if ((mmc_stat & ERRI_MASK) != 0)
                  return (unsigned char)mmc_stat;


            if (mmc_stat & CC_MASK) {
                  OMAP_HSMMC_STAT = CC_MASK;
                  response[0] = OMAP_HSMMC_RSP10;
                  if ((cmd & RSP_TYPE_MASK) == RSP_TYPE_LGHT136) {
                        response[1] = OMAP_HSMMC_RSP32;
                        response[2] = OMAP_HSMMC_RSP54;
                        response[3] = OMAP_HSMMC_RSP76;
                  }
                  break;
            }
      }
      return 1;
}

unsigned char mmc_read_data(unsigned int *output_buf)
{
      unsigned int mmc_stat;
      unsigned int read_count = 0;

      /*
       * Start Polled Read
       */
      while (1) {
            do {
                  mmc_stat = OMAP_HSMMC_STAT;
            } while (mmc_stat == 0);

            if ((mmc_stat & ERRI_MASK) != 0)
                  return (unsigned char)mmc_stat;

            if (mmc_stat & BRR_MASK) {
                  unsigned int k;

                  OMAP_HSMMC_STAT |= BRR_MASK;
                  for (k = 0; k < MMCSD_SECTOR_SIZE / 4; k++) {
                        *output_buf = OMAP_HSMMC_DATA;
                        output_buf++;
                        read_count += 4;
                  }
            }

            if (mmc_stat & BWR_MASK)
                  OMAP_HSMMC_STAT |= BWR_MASK;

            if (mmc_stat & TC_MASK) {
                  OMAP_HSMMC_STAT |= TC_MASK;
                  break;
            }
      }
      return 1;
}

unsigned char mmc_detect_card(mmc_card_data *mmc_card_cur)
{
      unsigned char err;
      unsigned int argument = 0;
      unsigned int ocr_value, ocr_recvd, ret_cmd41, hcs_val;
      unsigned int resp[4];
      unsigned short retry_cnt = 2000;

      /* Set to Initialization Clock */
      err = mmc_clock_config(CLK_400KHZ, 0);
      if (err != 1)
            return err;

      mmc_card_cur->RCA = MMC_RELATIVE_CARD_ADDRESS;
      argument = 0x00000000;

      ocr_value = (0x1FF << 15);
      err = mmc_send_cmd(MMC_CMD0, argument, resp);
      if (err != 1)
            return err;

      argument = SD_CMD8_CHECK_PATTERN | SD_CMD8_2_7_3_6_V_RANGE;
      err = mmc_send_cmd(MMC_SDCMD8, argument, resp);
      hcs_val = (err == 1) ?
          MMC_OCR_REG_HOST_CAPACITY_SUPPORT_SECTOR :
          MMC_OCR_REG_HOST_CAPACITY_SUPPORT_BYTE;

      argument = 0x0000 << 16;
      err = mmc_send_cmd(MMC_CMD55, argument, resp);
      if (err == 1) {
            mmc_card_cur->card_type = SD_CARD;
            ocr_value |= hcs_val;
            ret_cmd41 = MMC_ACMD41;
      } else {
            mmc_card_cur->card_type = MMC_CARD;
            ocr_value |= MMC_OCR_REG_ACCESS_MODE_SECTOR;
            ret_cmd41 = MMC_CMD1;
            OMAP_HSMMC_CON &= ~OD;
            OMAP_HSMMC_CON |= OPENDRAIN;
      }

      argument = ocr_value;
      err = mmc_send_cmd(ret_cmd41, argument, resp);
      if (err != 1)
            return err;

      ocr_recvd = ((mmc_resp_r3 *) resp)->ocr;

      while (!(ocr_recvd & (0x1 << 31)) && (retry_cnt > 0)) {
            retry_cnt--;
            if (mmc_card_cur->card_type == SD_CARD) {
                  argument = 0x0000 << 16;
                  err = mmc_send_cmd(MMC_CMD55, argument, resp);
            }

            argument = ocr_value;
            err = mmc_send_cmd(ret_cmd41, argument, resp);
            if (err != 1)
                  return err;
            ocr_recvd = ((mmc_resp_r3 *) resp)->ocr;
      }

      if (!(ocr_recvd & (0x1 << 31)))
            return 0;

      if (mmc_card_cur->card_type == MMC_CARD) {
            if ((ocr_recvd & MMC_OCR_REG_ACCESS_MODE_MASK) ==
                MMC_OCR_REG_ACCESS_MODE_SECTOR) {
                  mmc_card_cur->mode = SECTOR_MODE;
            } else {
                  mmc_card_cur->mode = BYTE_MODE;
            }

            ocr_recvd &= ~MMC_OCR_REG_ACCESS_MODE_MASK;
      } else {
            if ((ocr_recvd & MMC_OCR_REG_HOST_CAPACITY_SUPPORT_MASK)
                == MMC_OCR_REG_HOST_CAPACITY_SUPPORT_SECTOR) {
                  mmc_card_cur->mode = SECTOR_MODE;
            } else {
                  mmc_card_cur->mode = BYTE_MODE;
            }
            ocr_recvd &= ~MMC_OCR_REG_HOST_CAPACITY_SUPPORT_MASK;
      }

      ocr_recvd &= ~(0x1 << 31);
      if (!(ocr_recvd & ocr_value))
            return 0;

      err = mmc_send_cmd(MMC_CMD2, argument, resp);
      if (err != 1)
            return err;

      if (mmc_card_cur->card_type == MMC_CARD) {
            argument = mmc_card_cur->RCA << 16;
            err = mmc_send_cmd(MMC_CMD3, argument, resp);
            if (err != 1)
                  return err;
      } else {
            argument = 0x00000000;
            err = mmc_send_cmd(MMC_SDCMD3, argument, resp);
            if (err != 1)
                  return err;

            mmc_card_cur->RCA = ((mmc_resp_r6 *) resp)->newpublishedrca;
      }

      OMAP_HSMMC_CON &= ~OD;
      OMAP_HSMMC_CON |= NOOPENDRAIN;
      return 1;
}

unsigned char mmc_read_cardsize(mmc_card_data *mmc_dev_data,
                        mmc_csd_reg_t *cur_csd)
{
      mmc_extended_csd_reg_t ext_csd;
      unsigned int size, count, blk_len, blk_no, card_size, argument;
      unsigned char err;
      unsigned int resp[4];

      if (mmc_dev_data->mode == SECTOR_MODE) {
            if (mmc_dev_data->card_type == SD_CARD) {
                  card_size =
                      (((mmc_sd2_csd_reg_t *) cur_csd)->
                       c_size_lsb & MMC_SD2_CSD_C_SIZE_LSB_MASK) |
                      ((((mmc_sd2_csd_reg_t *) cur_csd)->
                        c_size_msb & MMC_SD2_CSD_C_SIZE_MSB_MASK)
                       << MMC_SD2_CSD_C_SIZE_MSB_OFFSET);
                  mmc_dev_data->size = card_size * 1024;
                  if (mmc_dev_data->size == 0)
                        return 0;
            } else {
                  argument = 0x00000000;
                  err = mmc_send_cmd(MMC_CMD8, argument, resp);
                  if (err != 1)
                        return err;
                  err = mmc_read_data((unsigned int *)&ext_csd);
                  if (err != 1)
                        return err;
                  mmc_dev_data->size = ext_csd.sectorcount;

                  if (mmc_dev_data->size == 0)
                        mmc_dev_data->size = 8388608;
            }
      } else {
            if (cur_csd->c_size_mult >= 8)
                  return 0;

            if (cur_csd->read_bl_len >= 12)
                  return 0;

            /* Compute size */
            count = 1 << (cur_csd->c_size_mult + 2);
            card_size = (cur_csd->c_size_lsb & MMC_CSD_C_SIZE_LSB_MASK) |
                ((cur_csd->c_size_msb & MMC_CSD_C_SIZE_MSB_MASK)
                 << MMC_CSD_C_SIZE_MSB_OFFSET);

            blk_no = (card_size + 1) * count;
            blk_len = 1 << cur_csd->read_bl_len;
            size = blk_no * blk_len;

            mmc_dev_data->size = size / MMCSD_SECTOR_SIZE;
            if (mmc_dev_data->size == 0)
                  return 0;
      }
      return 1;
}

unsigned char omap_mmc_read_sect(unsigned int start_sec, unsigned int num_bytes,
                         mmc_card_data *mmc_c,
                         unsigned int *output_buf)
{
      unsigned char err;
      unsigned int argument;
      unsigned int resp[4];
      unsigned int num_sec_val =
          (num_bytes + (MMCSD_SECTOR_SIZE - 1)) / MMCSD_SECTOR_SIZE;
      unsigned int sec_inc_val;

      if (num_sec_val == 0)
            return 1;

      if (mmc_c->mode == SECTOR_MODE) {
            argument = start_sec;
            sec_inc_val = 1;
      } else {
            argument = start_sec * MMCSD_SECTOR_SIZE;
            sec_inc_val = MMCSD_SECTOR_SIZE;
      }

      while (num_sec_val) {
            err = mmc_send_cmd(MMC_CMD17, argument, resp);
            if (err != 1)
                  return err;


            err = mmc_read_data(output_buf);
            if (err != 1)
                  return err;

            output_buf += (MMCSD_SECTOR_SIZE / 4);
            argument += sec_inc_val;
            num_sec_val--;
      }
      return 1;
}

unsigned char configure_mmc(mmc_card_data *mmc_card_cur)
{
      unsigned char ret_val;
      unsigned int argument;
      unsigned int resp[4];
      unsigned int trans_fact, trans_unit, retries = 2;
      unsigned int max_dtr;
      int dsor;
      mmc_csd_reg_t Card_CSD;
      unsigned char trans_speed;

      mmc_init_setup();

      do {
            ret_val = mmc_detect_card(mmc_card_cur);
            retries--;
      } while ((retries > 0) && (ret_val != 1));

      argument = mmc_card_cur->RCA << 16;
      ret_val = mmc_send_cmd(MMC_CMD9, argument, resp);
      if (ret_val != 1)
            return ret_val;

      ((unsigned int *)&Card_CSD)[3] = resp[3];
      ((unsigned int *)&Card_CSD)[2] = resp[2];
      ((unsigned int *)&Card_CSD)[1] = resp[1];
      ((unsigned int *)&Card_CSD)[0] = resp[0];

      if (mmc_card_cur->card_type == MMC_CARD)
            mmc_card_cur->version = Card_CSD.spec_vers;

      trans_speed = Card_CSD.tran_speed;

      ret_val = mmc_send_cmd(MMC_CMD4, MMC_DSR_DEFAULT << 16, resp);
      if (ret_val != 1)
            return ret_val;

      trans_unit = trans_speed & MMC_CSD_TRAN_SPEED_UNIT_MASK;
      trans_fact = trans_speed & MMC_CSD_TRAN_SPEED_FACTOR_MASK;

      if (trans_unit > MMC_CSD_TRAN_SPEED_UNIT_100MHZ)
            return 0;

      if ((trans_fact < MMC_CSD_TRAN_SPEED_FACTOR_1_0) ||
          (trans_fact > MMC_CSD_TRAN_SPEED_FACTOR_8_0))
            return 0;

      trans_unit >>= 0;
      trans_fact >>= 3;

      max_dtr = tran_exp[trans_unit] * tran_mant[trans_fact];
      dsor = OMAP_MMC_MASTER_CLOCK / max_dtr;

      if (dsor == 4)
            dsor = 5;
      if (dsor == 3)
            dsor = 4;

      ret_val = mmc_clock_config(CLK_MISC, dsor);
      if (ret_val != 1)
            return ret_val;

      argument = mmc_card_cur->RCA << 16;
      ret_val = mmc_send_cmd(MMC_CMD7_SELECT, argument, resp);
      if (ret_val != 1)
            return ret_val;

      /* Configure the block length to 512 bytes */
      argument = MMCSD_SECTOR_SIZE;
      ret_val = mmc_send_cmd(MMC_CMD16, argument, resp);
      if (ret_val != 1)
            return ret_val;

      /* get the card size in sectors */
      ret_val = mmc_read_cardsize(mmc_card_cur, &Card_CSD);
      if (ret_val != 1)
            return ret_val;

      return 1;
}

unsigned long mmc_bread(int dev_num, ulong blknr, ulong blkcnt, ulong *dst)
{
      unsigned long ret;
      ret = (unsigned long)omap_mmc_read_sect(blknr,
                        (blkcnt * MMCSD_SECTOR_SIZE),
                        &cur_card_data, (unsigned long *)dst);
      return ret;
}

int mmc_init(int verbose)
{
      unsigned char ret = 0;

      ret = configure_mmc(&cur_card_data);
      if (ret == 0)
            return -1;

      mmc_blk_dev.if_type = IF_TYPE_MMC;
      mmc_blk_dev.part_type = PART_TYPE_DOS;
      mmc_blk_dev.dev = 0;
      mmc_blk_dev.lun = 0;
      mmc_blk_dev.type = 0;

      /* FIXME fill in the correct size (is set to 32MByte) */
      mmc_blk_dev.blksz = MMCSD_SECTOR_SIZE;
      mmc_blk_dev.lba = 0x10000;
      mmc_blk_dev.removable = 0;
      mmc_blk_dev.block_read = mmc_bread;

      fat_register_device(&mmc_blk_dev, 1);

      return 0;
}

int mmc_read(unsigned int src, unsigned char *dst, int size)
{
      /*
       * NOT Implemented
       */
}
int mmc_write(unsigned char *src, unsigned long dst, int size)
{
      /*
       * NOT Implemented
       */
}

int mmc2info(unsigned int addr)
{
      /*
       * NOT Implemented
       */
}
#endif


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