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/* This file is part of the coreboot project. */
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* MultiMediaCard (MMC), eMMC and Secure Digital (SD) common initialization
* code which brings the card into the standby state. This code is controller
* independent.
*/
#include <commonlib/storage.h>
#include <delay.h>
#include <endian.h>
#include <string.h>
#include "mmc.h"
#include "sd_mmc.h"
#include "storage.h"
uint64_t sd_mmc_extract_uint32_bits(const uint32_t *array, int start, int count)
{
int i;
uint64_t value = 0;
for (i = 0; i < count; i++, start++) {
value <<= 1;
value |= (array[start / 32] >> (31 - (start % 32))) & 0x1;
}
return value;
}
static uint32_t sd_mmc_calculate_transfer_speed(uint32_t csd0)
{
uint32_t mult, freq;
/* frequency bases, divided by 10 to be nice to platforms without
* floating point */
static const int fbase[] = {
10000,
100000,
1000000,
10000000,
};
/* Multiplier values for TRAN_SPEED. Multiplied by 10 to be nice
* to platforms without floating point. */
static const int multipliers[] = {
0, // reserved
10,
12,
13,
15,
20,
25,
30,
35,
40,
45,
50,
55,
60,
70,
80,
};
/* divide frequency by 10, since the mults are 10x bigger */
freq = fbase[csd0 & 0x7];
mult = multipliers[(csd0 >> 3) & 0xf];
return freq * mult;
}
int sd_mmc_go_idle(struct storage_media *media)
{
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
// Some cards can't accept idle commands without delay.
if (ctrlr->mdelay_before_cmd0)
mdelay(ctrlr->mdelay_before_cmd0);
struct mmc_command cmd;
cmd.cmdidx = MMC_CMD_GO_IDLE_STATE;
cmd.cmdarg = 0;
cmd.resp_type = CARD_RSP_NONE;
cmd.flags = 0;
int err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
// Some cards need more than half second to respond to next command (ex,
// SEND_OP_COND).
if (ctrlr->mdelay_after_cmd0)
mdelay(ctrlr->mdelay_after_cmd0);
return 0;
}
int sd_mmc_send_status(struct storage_media *media, ssize_t tries)
{
struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
cmd.cmdidx = MMC_CMD_SEND_STATUS;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = media->rca << 16;
cmd.flags = 0;
while (tries--) {
int err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
else if (cmd.response[0] & MMC_STATUS_RDY_FOR_DATA)
break;
else if (cmd.response[0] & MMC_STATUS_MASK) {
sd_mmc_error("Status Error: %#8.8x\n", cmd.response[0]);
return CARD_COMM_ERR;
}
udelay(100);
}
sd_mmc_trace("CURR STATE:%d\n",
(cmd.response[0] & MMC_STATUS_CURR_STATE) >> 9);
if (tries < 0) {
sd_mmc_error("Timeout waiting card ready\n");
return CARD_TIMEOUT;
}
return 0;
}
int sd_mmc_set_blocklen(struct sd_mmc_ctrlr *ctrlr, int len)
{
struct mmc_command cmd;
cmd.cmdidx = MMC_CMD_SET_BLOCKLEN;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = len;
cmd.flags = 0;
return ctrlr->send_cmd(ctrlr, &cmd, NULL);
}
int sd_mmc_enter_standby(struct storage_media *media)
{
struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
int err;
SET_BUS_WIDTH(ctrlr, 1);
SET_CLOCK(ctrlr, 1);
/* Reset the Card */
err = sd_mmc_go_idle(media);
if (err)
return err;
/* Test for SD version 2 */
err = CARD_TIMEOUT;
if (CONFIG(COMMONLIB_STORAGE_SD)) {
err = sd_send_if_cond(media);
/* Get SD card operating condition */
if (!err)
err = sd_send_op_cond(media);
}
/* If the command timed out, we check for an MMC card */
if (CONFIG(COMMONLIB_STORAGE_MMC) && (err == CARD_TIMEOUT)) {
/* Some cards seem to need this */
sd_mmc_go_idle(media);
err = mmc_send_op_cond(media);
if (err == CARD_IN_PROGRESS)
err = mmc_complete_op_cond(media);
}
if (err) {
sd_mmc_error(
"Card did not respond to voltage select!\n");
return CARD_UNUSABLE_ERR;
}
/* Put the Card in Identify Mode */
cmd.cmdidx = MMC_CMD_ALL_SEND_CID;
cmd.resp_type = CARD_RSP_R2;
cmd.cmdarg = 0;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
memcpy(media->cid, cmd.response, sizeof(media->cid));
/*
* For MMC cards, set the Relative Address.
* For SD cards, get the Relative Address.
* This also puts the cards into Standby State
*/
cmd.cmdidx = SD_CMD_SEND_RELATIVE_ADDR;
cmd.cmdarg = media->rca << 16;
cmd.resp_type = CARD_RSP_R6;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
if (IS_SD(media))
media->rca = (cmd.response[0] >> 16) & 0xffff;
/* Get the Card-Specific Data */
cmd.cmdidx = MMC_CMD_SEND_CSD;
cmd.resp_type = CARD_RSP_R2;
cmd.cmdarg = media->rca << 16;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
/* Waiting for the ready status */
sd_mmc_send_status(media, SD_MMC_IO_RETRIES);
if (err)
return err;
memcpy(media->csd, cmd.response, sizeof(media->csd));
if (media->version == MMC_VERSION_UNKNOWN) {
int version = sd_mmc_extract_uint32_bits(media->csd, 2, 4);
switch (version) {
case 0:
media->version = MMC_VERSION_1_2;
break;
case 1:
media->version = MMC_VERSION_1_4;
break;
case 2:
media->version = MMC_VERSION_2_2;
break;
case 3:
media->version = MMC_VERSION_3;
break;
case 4:
media->version = MMC_VERSION_4;
break;
default:
media->version = MMC_VERSION_1_2;
break;
}
}
media->tran_speed = sd_mmc_calculate_transfer_speed(media->csd[0]);
/* Determine the read and write block lengths */
media->read_bl_len = 1 << sd_mmc_extract_uint32_bits(media->csd, 44, 4);
if (IS_SD(media))
media->write_bl_len = media->read_bl_len;
else
media->write_bl_len =
1 << sd_mmc_extract_uint32_bits(media->csd, 102, 4);
sd_mmc_debug("mmc media info: version=%#x, tran_speed=%d\n",
media->version, (int)media->tran_speed);
return 0;
}
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