From b9d57175c19be8f0d9fe48cd544152cd6c574dd3 Mon Sep 17 00:00:00 2001 From: San Mehat Date: Thu, 15 May 2008 09:15:37 -0700 Subject: [PATCH] mmc: Add new API call 'sdio_reset_comm' for resetting communication with an SDIO device Signed-off-by: San Mehat --- drivers/mmc/core/sdio.c | 57 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index 444a6cbb55b9..b90dd9e62999 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -1217,3 +1217,60 @@ err: return err; } +int sdio_reset_comm(struct mmc_card *card) +{ + struct mmc_host *host = card->host; + u32 ocr; + int err; + + printk("%s():\n", __func__); + mmc_go_idle(host); + + mmc_set_clock(host, host->f_min); + + err = mmc_send_io_op_cond(host, 0, &ocr); + if (err) + goto err; + + host->ocr = mmc_select_voltage(host, ocr); + if (!host->ocr) { + err = -EINVAL; + goto err; + } + + err = mmc_send_io_op_cond(host, host->ocr, &ocr); + if (err) + goto err; + + if (mmc_host_is_spi(host)) { + err = mmc_spi_set_crc(host, use_spi_crc); + if (err) + goto err; + } + + if (!mmc_host_is_spi(host)) { + err = mmc_send_relative_addr(host, &card->rca); + if (err) + goto err; + mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); + } + if (!mmc_host_is_spi(host)) { + err = mmc_select_card(card); + if (err) + goto err; + } + + mmc_set_clock(host, card->cis.max_dtr); + err = sdio_enable_wide(card); + if (err) + goto err; + + return 0; + err: + printk("%s: Error resetting SDIO communications (%d)\n", + mmc_hostname(host), err); + return err; +} +EXPORT_SYMBOL(sdio_reset_comm); + + -- 2.20.1