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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Secure Digital (SD) card specific support code
* This code is controller independent
*/
#include <commonlib/sd_mmc_ctrlr.h>
#include <commonlib/storage.h>
#include <delay.h>
#include <endian.h>
#include "sd_mmc.h"
#include "storage.h"
int sd_send_if_cond(struct storage_media *media)
{
struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
cmd.cmdidx = SD_CMD_SEND_IF_COND;
/* Set if controller supports voltages between 2.7 and 3.6 V. */
cmd.cmdarg = ((ctrlr->voltages & 0xff8000) != 0) << 8 | 0xaa;
cmd.resp_type = CARD_RSP_R7;
cmd.flags = 0;
int err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
if ((cmd.response[0] & 0xff) != 0xaa)
return CARD_UNUSABLE_ERR;
media->version = SD_VERSION_2;
return 0;
}
int sd_send_op_cond(struct storage_media *media)
{
int err;
struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
int tries = SD_MMC_IO_RETRIES;
while (tries--) {
cmd.cmdidx = MMC_CMD_APP_CMD;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = 0;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
cmd.cmdidx = SD_CMD_APP_SEND_OP_COND;
cmd.resp_type = CARD_RSP_R3;
/*
* Most cards do not answer if some reserved bits
* in the ocr are set. However, Some controller
* can set bit 7 (reserved for low voltages), but
* how to manage low voltages SD card is not yet
* specified.
*/
cmd.cmdarg = (ctrlr->voltages & 0xff8000);
if (media->version == SD_VERSION_2)
cmd.cmdarg |= OCR_HCS;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
// OCR_BUSY means "initialization complete".
if (cmd.response[0] & OCR_BUSY)
break;
udelay(100);
}
if (tries < 0)
return CARD_UNUSABLE_ERR;
if (media->version != SD_VERSION_2)
media->version = SD_VERSION_1_0;
media->ocr = cmd.response[0];
media->high_capacity = ((media->ocr & OCR_HCS) == OCR_HCS);
media->rca = 0;
return 0;
}
static int sd_switch(struct sd_mmc_ctrlr *ctrlr, int mode, int group,
uint8_t value, uint8_t *resp)
{
/* Switch the frequency */
struct mmc_command cmd;
cmd.cmdidx = SD_CMD_SWITCH_FUNC;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = (mode << 31) | (0xffffff & ~(0xf << (group * 4))) |
(value << (group * 4));
cmd.flags = 0;
struct mmc_data data;
data.dest = (char *)resp;
data.blocksize = 64;
data.blocks = 1;
data.flags = DATA_FLAG_READ;
return ctrlr->send_cmd(ctrlr, &cmd, &data);
}
static void sd_recalculate_clock(struct storage_media *media)
{
uint32_t clock = 1;
if (media->caps & DRVR_CAP_HS)
clock = CLOCK_50MHZ;
else
clock = CLOCK_25MHZ;
SET_CLOCK(media->ctrlr, clock);
}
int sd_change_freq(struct storage_media *media)
{
int delay;
int err, timeout;
struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
struct mmc_data data;
ALLOC_CACHE_ALIGN_BUFFER(uint32_t, scr, 2);
ALLOC_CACHE_ALIGN_BUFFER(uint32_t, switch_status, 16);
media->caps = 0;
/* Read the SCR to find out if this card supports higher speeds */
cmd.cmdidx = MMC_CMD_APP_CMD;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = media->rca << 16;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
cmd.cmdidx = SD_CMD_APP_SEND_SCR;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = 0;
cmd.flags = 0;
timeout = 3;
while (timeout--) {
data.dest = (char *)scr;
data.blocksize = 8;
data.blocks = 1;
data.flags = DATA_FLAG_READ;
err = ctrlr->send_cmd(ctrlr, &cmd, &data);
if (!err)
break;
}
if (err) {
sd_mmc_error("%s returning %d\n", __func__, err);
return err;
}
media->scr[0] = be32toh(scr[0]);
media->scr[1] = be32toh(scr[1]);
switch ((media->scr[0] >> 24) & 0xf) {
case 0:
media->version = SD_VERSION_1_0;
break;
case 1:
media->version = SD_VERSION_1_10;
break;
case 2:
media->version = SD_VERSION_2;
break;
default:
media->version = SD_VERSION_1_0;
break;
}
if (media->scr[0] & SD_DATA_4BIT)
media->caps |= DRVR_CAP_4BIT;
/* Version 1.0 doesn't support switching */
if (media->version == SD_VERSION_1_0)
goto out;
timeout = 4;
while (timeout--) {
err = sd_switch(ctrlr, SD_SWITCH_CHECK, 0, 1,
(uint8_t *)switch_status);
if (err)
return err;
/* The high-speed function is busy. Try again */
if (!(ntohl(switch_status[7]) & SD_HIGHSPEED_BUSY))
break;
}
/* If high-speed isn't supported, we return */
if (!(ntohl(switch_status[3]) & SD_HIGHSPEED_SUPPORTED))
goto out;
/*
* If the controller doesn't support SD_HIGHSPEED, do not switch the
* card to HIGHSPEED mode even if the card support SD_HIGHSPPED.
* This can avoid a further problem when the card runs in different
* mode than the controller.
*/
if (!((ctrlr->caps & DRVR_CAP_HS52) && (ctrlr->caps & DRVR_CAP_HS)))
goto out;
/* Give the card time to recover after the switch operation. Wait for
* 9 (>= 8) clock cycles receiving the switch status.
*/
delay = (9000000 + ctrlr->bus_hz - 1) / ctrlr->bus_hz;
udelay(delay);
/* Switch to high speed */
err = sd_switch(ctrlr, SD_SWITCH_SWITCH, 0, 1,
(uint8_t *)switch_status);
if (err)
return err;
/* Give the card time to perform the switch operation. Wait for 9
* (>= 8) clock cycles receiving the switch status.
*/
udelay(delay);
if ((ntohl(switch_status[4]) & 0x0f000000) == 0x01000000) {
media->caps |= DRVR_CAP_HS;
SET_TIMING(ctrlr, BUS_TIMING_SD_HS);
}
out:
sd_recalculate_clock(media);
return 0;
}
int sd_set_bus_width(struct storage_media *media)
{
int err;
struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
if (media->caps & DRVR_CAP_4BIT) {
cmd.cmdidx = MMC_CMD_APP_CMD;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = media->rca << 16;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
cmd.cmdidx = SD_CMD_APP_SET_BUS_WIDTH;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = 2;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
SET_BUS_WIDTH(ctrlr, 4);
}
return 0;
}
int sd_set_partition(struct storage_media *media,
unsigned int partition_number)
{
/* Validate the partition number */
if (partition_number)
return -1;
/* Update the partition number */
media->partition_config = partition_number;
return 0;
}
const char *sd_partition_name(struct storage_media *media,
unsigned int partition_number)
{
return "";
}
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