X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fmmc%2Fcore%2Fmmc_ops.c;h=64b05c6270f2f3aef54d88e309f8772694c4347a;hb=e9f76354ce83a20c7768ad37caa033f6506b4f96;hp=7dd720fa589550a9500cb39333187c1273bc3c82;hpb=2d56d3c43cc97ae48586745556f5a5b564d61582;p=linux-2.6 diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index 7dd720fa58..64b05c6270 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -1,5 +1,5 @@ /* - * linux/drivers/mmc/mmc_ops.h + * linux/drivers/mmc/core/mmc_ops.h * * Copyright 2006-2007 Pierre Ossman * @@ -10,7 +10,6 @@ */ #include -#include #include #include @@ -40,10 +39,10 @@ static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card) } err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); - if (err != MMC_ERR_NONE) + if (err) return err; - return MMC_ERR_NONE; + return 0; } int mmc_select_card(struct mmc_card *card) @@ -63,23 +62,36 @@ int mmc_go_idle(struct mmc_host *host) int err; struct mmc_command cmd; - mmc_set_chip_select(host, MMC_CS_HIGH); - - mmc_delay(1); + /* + * Non-SPI hosts need to prevent chipselect going active during + * GO_IDLE; that would put chips into SPI mode. Remind them of + * that in case of hardware that won't pull up DAT3/nCS otherwise. + * + * SPI hosts ignore ios.chip_select; it's managed according to + * rules that must accomodate non-MMC slaves which this layer + * won't even know about. + */ + if (!mmc_host_is_spi(host)) { + mmc_set_chip_select(host, MMC_CS_HIGH); + mmc_delay(1); + } memset(&cmd, 0, sizeof(struct mmc_command)); cmd.opcode = MMC_GO_IDLE_STATE; cmd.arg = 0; - cmd.flags = MMC_RSP_NONE | MMC_CMD_BC; + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC; err = mmc_wait_for_cmd(host, &cmd, 0); mmc_delay(1); - mmc_set_chip_select(host, MMC_CS_DONTCARE); + if (!mmc_host_is_spi(host)) { + mmc_set_chip_select(host, MMC_CS_DONTCARE); + mmc_delay(1); + } - mmc_delay(1); + host->use_spi_crc = 0; return err; } @@ -94,23 +106,33 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) memset(&cmd, 0, sizeof(struct mmc_command)); cmd.opcode = MMC_SEND_OP_COND; - cmd.arg = ocr; - cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; + cmd.arg = mmc_host_is_spi(host) ? 0 : ocr; + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR; for (i = 100; i; i--) { err = mmc_wait_for_cmd(host, &cmd, 0); - if (err != MMC_ERR_NONE) + if (err) break; - if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) + /* if we're just probing, do a single pass */ + if (ocr == 0) break; - err = MMC_ERR_TIMEOUT; + /* otherwise wait until reset completes */ + if (mmc_host_is_spi(host)) { + if (!(cmd.resp[0] & R1_SPI_IDLE)) + break; + } else { + if (cmd.resp[0] & MMC_CARD_BUSY) + break; + } + + err = -ETIMEDOUT; mmc_delay(10); } - if (rocr) + if (rocr && !mmc_host_is_spi(host)) *rocr = cmd.resp[0]; return err; @@ -131,12 +153,12 @@ int mmc_all_send_cid(struct mmc_host *host, u32 *cid) cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR; err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); - if (err != MMC_ERR_NONE) + if (err) return err; memcpy(cid, cmd.resp, sizeof(u32) * 4); - return MMC_ERR_NONE; + return 0; } int mmc_set_relative_addr(struct mmc_card *card) @@ -154,46 +176,52 @@ int mmc_set_relative_addr(struct mmc_card *card) cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES); - if (err != MMC_ERR_NONE) + if (err) return err; - return MMC_ERR_NONE; + return 0; } -int mmc_send_csd(struct mmc_card *card, u32 *csd) +static int +mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode) { int err; struct mmc_command cmd; - BUG_ON(!card); - BUG_ON(!card->host); - BUG_ON(!csd); + BUG_ON(!host); + BUG_ON(!cxd); memset(&cmd, 0, sizeof(struct mmc_command)); - cmd.opcode = MMC_SEND_CSD; - cmd.arg = card->rca << 16; + cmd.opcode = opcode; + cmd.arg = arg; cmd.flags = MMC_RSP_R2 | MMC_CMD_AC; - err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES); - if (err != MMC_ERR_NONE) + err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); + if (err) return err; - memcpy(csd, cmd.resp, sizeof(u32) * 4); + memcpy(cxd, cmd.resp, sizeof(u32) * 4); - return MMC_ERR_NONE; + return 0; } -int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd) +static int +mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host, + u32 opcode, void *buf, unsigned len) { struct mmc_request mrq; struct mmc_command cmd; struct mmc_data data; struct scatterlist sg; + void *data_buf; - BUG_ON(!card); - BUG_ON(!card->host); - BUG_ON(!ext_csd); + /* dma onto stack is unsafe/nonportable, but callers to this + * routine normally provide temporary on-stack buffers ... + */ + data_buf = kmalloc(len, GFP_KERNEL); + if (data_buf == NULL) + return -ENOMEM; memset(&mrq, 0, sizeof(struct mmc_request)); memset(&cmd, 0, sizeof(struct mmc_command)); @@ -202,28 +230,117 @@ int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd) mrq.cmd = &cmd; mrq.data = &data; - cmd.opcode = MMC_SEND_EXT_CSD; + cmd.opcode = opcode; cmd.arg = 0; - cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; - data.blksz = 512; + /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we + * rely on callers to never use this with "native" calls for reading + * CSD or CID. Native versions of those commands use the R2 type, + * not R1 plus a data block. + */ + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; + + data.blksz = len; data.blocks = 1; data.flags = MMC_DATA_READ; data.sg = &sg; data.sg_len = 1; - sg_init_one(&sg, ext_csd, 512); + sg_init_one(&sg, data_buf, len); + + if (card) + mmc_set_data_timeout(&data, card); - mmc_set_data_timeout(&data, card, 0); + mmc_wait_for_req(host, &mrq); - mmc_wait_for_req(card->host, &mrq); + memcpy(buf, data_buf, len); + kfree(data_buf); - if (cmd.error != MMC_ERR_NONE) + if (cmd.error) return cmd.error; - if (data.error != MMC_ERR_NONE) + if (data.error) return data.error; - return MMC_ERR_NONE; + return 0; +} + +int mmc_send_csd(struct mmc_card *card, u32 *csd) +{ + int ret, i; + + if (!mmc_host_is_spi(card->host)) + return mmc_send_cxd_native(card->host, card->rca << 16, + csd, MMC_SEND_CSD); + + ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16); + if (ret) + return ret; + + for (i = 0;i < 4;i++) + csd[i] = be32_to_cpu(csd[i]); + + return 0; +} + +int mmc_send_cid(struct mmc_host *host, u32 *cid) +{ + int ret, i; + + if (!mmc_host_is_spi(host)) { + if (!host->card) + return -EINVAL; + return mmc_send_cxd_native(host, host->card->rca << 16, + cid, MMC_SEND_CID); + } + + ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16); + if (ret) + return ret; + + for (i = 0;i < 4;i++) + cid[i] = be32_to_cpu(cid[i]); + + return 0; +} + +int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd) +{ + return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, + ext_csd, 512); +} + +int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp) +{ + struct mmc_command cmd; + int err; + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_SPI_READ_OCR; + cmd.arg = highcap ? (1 << 30) : 0; + cmd.flags = MMC_RSP_SPI_R3; + + err = mmc_wait_for_cmd(host, &cmd, 0); + + *ocrp = cmd.resp[1]; + return err; +} + +int mmc_spi_set_crc(struct mmc_host *host, int use_crc) +{ + struct mmc_command cmd; + int err; + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_SPI_CRC_ON_OFF; + cmd.flags = MMC_RSP_SPI_R1; + cmd.arg = use_crc; + + err = mmc_wait_for_cmd(host, &cmd, 0); + if (!err) + host->use_spi_crc = use_crc; + return err; } int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value) @@ -241,13 +358,13 @@ int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value) (index << 16) | (value << 8) | set; - cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; + cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES); - if (err != MMC_ERR_NONE) + if (err) return err; - return MMC_ERR_NONE; + return 0; } int mmc_send_status(struct mmc_card *card, u32 *status) @@ -261,16 +378,20 @@ int mmc_send_status(struct mmc_card *card, u32 *status) memset(&cmd, 0, sizeof(struct mmc_command)); cmd.opcode = MMC_SEND_STATUS; - cmd.arg = card->rca << 16; - cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; + if (!mmc_host_is_spi(card->host)) + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES); - if (err != MMC_ERR_NONE) + if (err) return err; + /* NOTE: callers are required to understand the difference + * between "native" and SPI format status words! + */ if (status) *status = cmd.resp[0]; - return MMC_ERR_NONE; + return 0; }