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/* $OpenBSD: sdmmc_mem.c,v 1.2 2006/05/28 18:45:23 uwe Exp $ */
/*
* Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* Routines for SD/MMC memory cards. */
#include <sys/param.h>
#include <sys/systm.h>
#include <dev/sdmmc/sdmmcchip.h>
#include <dev/sdmmc/sdmmcreg.h>
#include <dev/sdmmc/sdmmcvar.h>
int sdmmc_mem_send_op_cond(struct sdmmc_softc *, u_int32_t, u_int32_t *);
int sdmmc_mem_set_blocklen(struct sdmmc_softc *, struct sdmmc_card *);
#ifdef SDMMC_DEBUG
#define DPRINTF(s) printf s
#else
#define DPRINTF(s) /**/
#endif
/*
* Initialize SD/MMC memory cards and memory in SDIO "combo" cards.
*/
int
sdmmc_mem_enable(struct sdmmc_softc *sc)
{
u_int32_t host_ocr;
u_int32_t card_ocr;
/* Set host mode to SD "combo" card or SD memory-only. */
SET(sc->sc_flags, SMF_SD_MODE|SMF_MEM_MODE);
/* Reset memory (*must* do that before CMD55 or CMD1). */
sdmmc_go_idle_state(sc);
/*
* Read the SD/MMC memory OCR value by issuing CMD55 followed
* by ACMD41 to read the OCR value from memory-only SD cards.
* MMC cards will not respond to CMD55 or ACMD41 and this is
* how we distinguish them from SD cards.
*/
mmc_mode:
if (sdmmc_mem_send_op_cond(sc, 0, &card_ocr) != 0) {
DPRINTF(("flags %x\n", sc->sc_flags));
if (ISSET(sc->sc_flags, SMF_SD_MODE) &&
!ISSET(sc->sc_flags, SMF_IO_MODE)) {
/* Not a SD card, switch to MMC mode. */
CLR(sc->sc_flags, SMF_SD_MODE);
goto mmc_mode;
}
if (!ISSET(sc->sc_flags, SMF_SD_MODE)) {
printf("%s: can't read memory OCR\n",
SDMMCDEVNAME(sc));
return 1;
} else {
/* Not a "combo" card. */
CLR(sc->sc_flags, SMF_MEM_MODE);
return 0;
}
}
/* Set the lowest voltage supported by the card and host. */
host_ocr = sdmmc_chip_host_ocr(sc->sct, sc->sch);
if (sdmmc_set_bus_power(sc, host_ocr, card_ocr) != 0) {
printf("%s: can't supply voltage requested by card\n",
SDMMCDEVNAME(sc));
return 1;
}
/* Tell the card(s) to enter the idle state (again). */
sdmmc_go_idle_state(sc);
/* Send the new OCR value until all cards are ready. */
if (sdmmc_mem_send_op_cond(sc, host_ocr, NULL) != 0) {
printf("%s: can't send memory OCR\n", SDMMCDEVNAME(sc));
return 1;
}
return 0;
}
/*
* Initialize a SD/MMC memory card.
*/
int
sdmmc_mem_init(struct sdmmc_softc *sc, struct sdmmc_card *cs)
{
if (sdmmc_select_card(sc, cs) != 0 ||
sdmmc_mem_set_blocklen(sc, cs) != 0)
return 1;
return 0;
}
/*
* Get or set the card's memory OCR value (SD or MMC).
*/
int
sdmmc_mem_send_op_cond(struct sdmmc_softc *sc, u_int32_t ocr,
u_int32_t *ocrp)
{
struct sdmmc_command cmd;
int error;
int i;
/*
* If we change the OCR value, retry the command until the OCR
* we receive in response has the "CARD BUSY" bit set, meaning
* that all cards are ready for card identification.
*/
for (i = 0; i < 100; i++) {
bzero(&cmd, sizeof cmd);
cmd.c_arg = ocr;
cmd.c_flags = SCF_CMD_BCR | SCF_RSP_R3;
if (ISSET(sc->sc_flags, SMF_SD_MODE)) {
cmd.c_opcode = SD_APP_OP_COND;
error = sdmmc_app_command(sc, &cmd);
} else {
cmd.c_opcode = MMC_SEND_OP_COND;
error = sdmmc_mmc_command(sc, &cmd);
}
if (error != 0)
break;
if (ISSET(MMC_R3(cmd.c_resp), MMC_OCR_MEM_READY) ||
ocr == 0)
break;
error = ETIMEDOUT;
sdmmc_delay(10000);
}
if (error == 0 && ocrp != NULL)
*ocrp = MMC_R3(cmd.c_resp);
return error;
}
/*
* Set the read block length appropriately for this card, according to
* the card CSD register value.
*/
int
sdmmc_mem_set_blocklen(struct sdmmc_softc *sc, struct sdmmc_card *cs)
{
struct sdmmc_command cmd;
bzero(&cmd, sizeof cmd);
cmd.c_opcode = MMC_SET_BLOCKLEN;
cmd.c_arg = cs->csd.sector_size;
cmd.c_flags = SCF_CMD_AC | SCF_RSP_R1;
DPRINTF(("%s: read_bl_len=%d sector_size=%d\n", SDMMCDEVNAME(sc),
1 << cs->csd.read_bl_len, cs->csd.sector_size));
return sdmmc_mmc_command(sc, &cmd);
}
int
sdmmc_mem_read_block(struct sdmmc_softc *sc, struct sdmmc_card *cs,
int blkno, u_char *data, size_t datalen)
{
struct sdmmc_command cmd;
int error;
if ((error = sdmmc_select_card(sc, cs)) != 0)
return error;
bzero(&cmd, sizeof cmd);
cmd.c_data = data;
cmd.c_datalen = datalen;
cmd.c_blklen = cs->csd.sector_size;
cmd.c_opcode = (datalen / cmd.c_blklen) > 1 ?
MMC_READ_BLOCK_MULTIPLE : MMC_READ_BLOCK_SINGLE;
cmd.c_arg = blkno << 9;
cmd.c_flags = SCF_CMD_ADTC | SCF_CMD_READ | SCF_RSP_R1;
error = sdmmc_mmc_command(sc, &cmd);
if (error != 0)
return error;
do {
bzero(&cmd, sizeof cmd);
cmd.c_opcode = MMC_SEND_STATUS;
cmd.c_arg = MMC_ARG_RCA(cs->rca);
cmd.c_flags = SCF_CMD_AC | SCF_RSP_R1;
error = sdmmc_mmc_command(sc, &cmd);
if (error != 0)
break;
/* XXX time out */
} while (!ISSET(MMC_R1(cmd.c_resp), MMC_R1_READY_FOR_DATA));
return error;
}
int
sdmmc_mem_write_block(struct sdmmc_softc *sc, struct sdmmc_card *cs,
int blkno, u_char *data, size_t datalen)
{
struct sdmmc_command cmd;
int error;
if ((error = sdmmc_select_card(sc, cs)) != 0)
return error;
bzero(&cmd, sizeof cmd);
cmd.c_data = data;
cmd.c_datalen = datalen;
cmd.c_blklen = cs->csd.sector_size;
cmd.c_opcode = (datalen / cmd.c_blklen) > 1 ?
MMC_WRITE_BLOCK_MULTIPLE : MMC_WRITE_BLOCK_SINGLE;
cmd.c_arg = blkno << 9;
cmd.c_flags = SCF_CMD_ADTC | SCF_RSP_R1;
error = sdmmc_mmc_command(sc, &cmd);
if (error != 0)
return error;
do {
bzero(&cmd, sizeof cmd);
cmd.c_opcode = MMC_SEND_STATUS;
cmd.c_arg = MMC_ARG_RCA(cs->rca);
cmd.c_flags = SCF_CMD_AC | SCF_RSP_R1;
error = sdmmc_mmc_command(sc, &cmd);
if (error != 0)
break;
/* XXX time out */
} while (!ISSET(MMC_R1(cmd.c_resp), MMC_R1_READY_FOR_DATA));
return error;
}
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