详解linux 驱动编写（sd卡驱动）

drivers/mmc 

obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o 
...... 
obj-$(CONFIG_MMC_S3C)    += s3cmci.o 

config MMC_SDHCI_S3C 
  tristate "SDHCI support on Samsung S3C SoC" 
  depends on MMC_SDHCI && PLAT_SAMSUNG 
  help 
   This selects the Secure Digital Host Controller Interface (SDHCI) 
   often referrered to as the HSMMC block in some of the Samsung S3C 
   range of SoC. 
 
   If you have a controller with this interface, say Y or M here. 
 
   If unsure, say N. 
 
config MMC_SDHCI_S3C_DMA 
  bool "DMA support on S3C SDHCI" 
  depends on MMC_SDHCI_S3C 
  help 
   Enable DMA support on the Samsung S3C SDHCI glue. The DMA 
   has proved to be problematic if the controller encounters 
   certain errors, and thus should be treated with care. 
 
   YMMV. 
 
config MMC_S3C 
  tristate "Samsung S3C SD/MMC Card Interface support" 
  depends on ARCH_S3C24XX 
  depends on S3C24XX_DMAC 
  help 
   This selects a driver for the MCI interface found in 
     Samsung's S3C2410, S3C2412, S3C2440, S3C2442 CPUs. 
   If you have a board based on one of those and a MMC/SD 
   slot, say Y or M here. 
 
   If unsure, say N. 

static const struct mmc_host_ops s3cmci_ops = { 
  .request  = s3cmci_request, 
  .set_ios  = s3cmci_set_ios, 
  .get_ro   = mmc_gpio_get_ro, 
  .get_cd   = mmc_gpio_get_cd, 
  .enable_sdio_irq = s3cmci_enable_sdio_irq, 
}; 

static struct sdhci_ops sdhci_s3c_ops = { 
  .get_max_clock   = sdhci_s3c_get_max_clk, 
  .set_clock   = sdhci_s3c_set_clock, 
  .get_min_clock   = sdhci_s3c_get_min_clock, 
  .set_bus_width   = sdhci_set_bus_width, 
  .reset     = sdhci_reset, 
  .set_uhs_signaling = sdhci_set_uhs_signaling, 
};