From af51715079e7fb6b290e1881d63d815dc4de5011 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Wed, 8 Aug 2007 09:11:32 -0700 Subject: MMC core learns about SPI Teach the MMC/SD/SDIO core about using SPI mode. - Use mmc_host_is_spi() so enumeration works through SPI signaling and protocols, not just the native versions. - Provide the SPI response type flags with each request issued, including requests from the new lock/unlock code. - Understand that cmd->resp[0] and mmc_get_status() results for SPI return different values than for "native" MMC/SD protocol; this affects resetting, checking card lock status, and some others. - Understand that some commands act a bit differently ... notably: * OP_COND command doesn't return the OCR * APP_CMD status doesn't have an R1_APP_CMD analogue Those changes required some new and updated primitives: - Provide utilities to access two SPI-only requests, and one request that wasn't previously needed: * mmc_spi_read_ocr() ... SPI only * mmc_spi_set_crc() ... SPI only (override by module parm) * mmc_send_cid() ... for use without broadcast mode - Updated internal routines: * Previous mmc_send_csd() modified into mmc_send_cxd_native(); it uses native "R2" responses, which include 16 bytes of data. * Previous mmc_send_ext_csd() becomes new mmc_send_cxd_data() helper for command-and-data access * Bugfix to that mmc_send_cxd_data() code: dma-to-stack is unsafe/nonportable, so kmalloc a bounce buffer instead. - Modified mmc_send_ext_csd() now uses mmc_send_cxd_data() helper - Modified mmc_send_csd(), and new mmc_spi_send_cid(), routines use those helper routines based on whether they're native or SPI The newest categories of cards supported by the MMC stack aren't expected to work yet with SPI: MMC or SD cards with over 4GB data, and SDIO. All those cards support SPI mode, so eventually they should work too. Signed-off-by: David Brownell Signed-off-by: Pierre Ossman --- drivers/mmc/core/sdio_ops.c | 66 ++++++++++++++++++++++++++++++++------------- 1 file changed, 47 insertions(+), 19 deletions(-) (limited to 'drivers/mmc/core/sdio_ops.c') diff --git a/drivers/mmc/core/sdio_ops.c b/drivers/mmc/core/sdio_ops.c index 98e20532452a..4d289b275031 100644 --- a/drivers/mmc/core/sdio_ops.c +++ b/drivers/mmc/core/sdio_ops.c @@ -30,23 +30,39 @@ int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) cmd.opcode = SD_IO_SEND_OP_COND; cmd.arg = ocr; - cmd.flags = MMC_RSP_R4 | MMC_CMD_BCR; + cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR; for (i = 100; i; i--) { err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 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; + /* otherwise wait until reset completes */ + if (mmc_host_is_spi(host)) { + /* + * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate + * an initialized card under SPI, but some cards + * (Marvell's) only behave when looking at this + * one. + */ + if (cmd.resp[1] & MMC_CARD_BUSY) + break; + } else { + if (cmd.resp[0] & MMC_CARD_BUSY) + break; + } + err = -ETIMEDOUT; mmc_delay(10); } if (rocr) - *rocr = cmd.resp[0]; + *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0]; return err; } @@ -68,21 +84,29 @@ int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn, cmd.arg |= (write && out) ? 0x08000000 : 0x00000000; cmd.arg |= addr << 9; cmd.arg |= in; - cmd.flags = MMC_RSP_R5 | MMC_CMD_AC; + cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC; err = mmc_wait_for_cmd(card->host, &cmd, 0); if (err) return err; - if (cmd.resp[0] & R5_ERROR) - return -EIO; - if (cmd.resp[0] & R5_FUNCTION_NUMBER) - return -EINVAL; - if (cmd.resp[0] & R5_OUT_OF_RANGE) - return -ERANGE; + if (mmc_host_is_spi(card->host)) { + /* host driver already reported errors */ + } else { + if (cmd.resp[0] & R5_ERROR) + return -EIO; + if (cmd.resp[0] & R5_FUNCTION_NUMBER) + return -EINVAL; + if (cmd.resp[0] & R5_OUT_OF_RANGE) + return -ERANGE; + } - if (out) - *out = cmd.resp[0] & 0xFF; + if (out) { + if (mmc_host_is_spi(card->host)) + *out = (cmd.resp[0] >> 8) & 0xFF; + else + *out = cmd.resp[0] & 0xFF; + } return 0; } @@ -117,7 +141,7 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn, cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */ else cmd.arg |= 0x08000000 | blocks; /* block mode */ - cmd.flags = MMC_RSP_R5 | MMC_CMD_ADTC; + cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC; data.blksz = blksz; data.blocks = blocks; @@ -136,12 +160,16 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn, if (data.error) return data.error; - if (cmd.resp[0] & R5_ERROR) - return -EIO; - if (cmd.resp[0] & R5_FUNCTION_NUMBER) - return -EINVAL; - if (cmd.resp[0] & R5_OUT_OF_RANGE) - return -ERANGE; + if (mmc_host_is_spi(card->host)) { + /* host driver already reported errors */ + } else { + if (cmd.resp[0] & R5_ERROR) + return -EIO; + if (cmd.resp[0] & R5_FUNCTION_NUMBER) + return -EINVAL; + if (cmd.resp[0] & R5_OUT_OF_RANGE) + return -ERANGE; + } return 0; } -- cgit v1.2.3