/* $OpenBSD: sdmmc_mem.c,v 1.4 2006/06/29 01:40:51 uwe Exp $ */ /* * Copyright (c) 2006 Uwe Stuehler * * 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 #include #include #include #include #include #include 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_function *); #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)) { DPRINTF(("%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) { DPRINTF(("%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) { DPRINTF(("%s: can't send memory OCR\n", SDMMCDEVNAME(sc))); return 1; } return 0; } /* * Read the CSD and CID from all cards and assign each card a unique * relative card address (RCA). CMD2 is ignored by SDIO-only cards. */ void sdmmc_mem_scan(struct sdmmc_softc *sc) { struct sdmmc_command cmd; struct sdmmc_function *sf; u_int16_t next_rca; int error; int i; /* * CMD2 is a broadcast command understood by SD cards and MMC * cards. All cards begin to respond to the command, but back * off if another card drives the CMD line to a different level. * Only one card will get its entire response through. That * card remains silent once it has been assigned a RCA. */ for (i = 0; i < 100; i++) { bzero(&cmd, sizeof cmd); cmd.c_opcode = MMC_ALL_SEND_CID; cmd.c_flags = SCF_CMD_BCR | SCF_RSP_R2; error = sdmmc_mmc_command(sc, &cmd); if (error == ETIMEDOUT) { /* No more cards there. */ break; } else if (error != 0) { DPRINTF(("%s: can't read CID\n", SDMMCDEVNAME(sc))); break; } /* In MMC mode, find the next available RCA. */ next_rca = 1; if (!ISSET(sc->sc_flags, SMF_SD_MODE)) SIMPLEQ_FOREACH(sf, &sc->sf_head, sf_list) next_rca++; /* Allocate a sdmmc_function structure. */ sf = sdmmc_function_alloc(sc); sf->rca = next_rca; /* * Remember the CID returned in the CMD2 response for * later decoding. */ bcopy(cmd.c_resp, sf->raw_cid, sizeof sf->raw_cid); /* * Silence the card by assigning it a unique RCA, or * querying it for its RCA in the case of SD. */ if (sdmmc_set_relative_addr(sc, sf) != 0) { printf("%s: can't set mem RCA\n", SDMMCDEVNAME(sc)); sdmmc_function_free(sf); break; } #if 0 /* Verify that the RCA has been set by selecting the card. */ if (sdmmc_select_card(sc, sf) != 0) { printf("%s: can't select mem RCA %d\n", SDMMCDEVNAME(sc), sf->rca); sdmmc_function_free(sf); break; } /* Deselect. */ (void)sdmmc_select_card(sc, NULL); #endif /* * If this is a memory-only card, the card responding * first becomes an alias for SDIO function 0. */ if (sc->sc_fn0 == NULL) sc->sc_fn0 = sf; SIMPLEQ_INSERT_TAIL(&sc->sf_head, sf, sf_list); } /* * All cards are either inactive or awaiting further commands. * Read the CSDs and decode the raw CID for each card. */ SIMPLEQ_FOREACH(sf, &sc->sf_head, sf_list) { bzero(&cmd, sizeof cmd); cmd.c_opcode = MMC_SEND_CSD; cmd.c_arg = MMC_ARG_RCA(sf->rca); cmd.c_flags = SCF_CMD_AC | SCF_RSP_R2; if (sdmmc_mmc_command(sc, &cmd) != 0) { SET(sf->flags, SFF_ERROR); continue; } if (sdmmc_decode_csd(sc, cmd.c_resp, sf) != 0 || sdmmc_decode_cid(sc, sf->raw_cid, sf) != 0) { SET(sf->flags, SFF_ERROR); continue; } #ifdef SDMMC_DEBUG printf("%s: CID: ", SDMMCDEVNAME(sc)); sdmmc_print_cid(&sf->cid); #endif } } /* * Initialize a SD/MMC memory card. */ int sdmmc_mem_init(struct sdmmc_softc *sc, struct sdmmc_function *sf) { if (sdmmc_select_card(sc, sf) != 0 || sdmmc_mem_set_blocklen(sc, sf) != 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 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_function *sf) { struct sdmmc_command cmd; bzero(&cmd, sizeof cmd); cmd.c_opcode = MMC_SET_BLOCKLEN; cmd.c_arg = sf->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 << sf->csd.read_bl_len, sf->csd.sector_size)); return sdmmc_mmc_command(sc, &cmd); } int sdmmc_mem_read_block(struct sdmmc_softc *sc, struct sdmmc_function *sf, int blkno, u_char *data, size_t datalen) { struct sdmmc_command cmd; int error; if ((error = sdmmc_select_card(sc, sf)) != 0) return error; bzero(&cmd, sizeof cmd); cmd.c_data = data; cmd.c_datalen = datalen; cmd.c_blklen = sf->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(sf->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_function *sf, int blkno, u_char *data, size_t datalen) { struct sdmmc_command cmd; int error; if ((error = sdmmc_select_card(sc, sf)) != 0) return error; bzero(&cmd, sizeof cmd); cmd.c_data = data; cmd.c_datalen = datalen; cmd.c_blklen = sf->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(sf->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; }