Wolfgang Wegner wrote:
Hi Andre,
On Fri, Jan 23, 2009 at 01:43:47PM +0100, Andre Schwarz wrote:
Sai Amruta wrote:
Hi All,
I am using linux-2.6.26 on MPC8567 and microSD is connected through
SPI interface.
Is the existing mmc driver supports microSD?
yes - it's working perfectly fine on my MPC8343.
Even with SDHC cards ;-)
that's great to hear - is there anything like a HOWTO on how to set
this up on top of the SPI driver (probably involving some custom GPIO
stuff for card and WP detection) out there?
I tried to but did not get it to work on MCF53xx (uClinux 2.6.23-uc0)
and probably did not find the right search strings either.
Regards,
Wolfgang
I'm sorry - no README.
All I can do is provide the info how it works for me :
platform code : provide init and chips select functions.
static void mvblm7_spi_activate_cs(u8 cs, u8 polarity)
{
u32 data = in_be32( mvblm7_gpio + 2 );
if (polarity)
out_be32( mvblm7_gpio + 2, data | MVBLM7_MMC_CS );
else
out_be32( mvblm7_gpio + 2, data & ~MVBLM7_MMC_CS );
}
static void mvblm7_spi_deactivate_cs(u8 cs, u8 polarity)
{
u32 data = in_be32( mvblm7_gpio + 2 );
if (!polarity)
out_be32( mvblm7_gpio + 2, data | MVBLM7_MMC_CS );
else
out_be32( mvblm7_gpio + 2, data & ~MVBLM7_MMC_CS );
}
static struct mmc_spi_platform_data mvblm7_mmc_pdata = {
.ocr_mask = MMC_VDD_33_34,
};
static struct spi_board_info mvblm7_spi_boardinfo = {
.bus_num = 0x7000,
.chip_select = 0,
.max_speed_hz = 50000000,
.modalias = "mmc_spi",
.platform_data = &mvblm7_mmc_pdata,
};
static int __init mvblm7_spi_init(void)
{
return fsl_spi_init(&mvblm7_spi_boardinfo, 1,
mvblm7_spi_activate_cs,
mvblm7_spi_deactivate_cs);
}
machine_device_initcall(mvblm7, mvblm7_spi_init);
Kernel config :
CONFIG_MMC=y
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_BOUNCE=y
CONFIG_MMC_SPI=m
and of course the driver for your SPI controller ...
CONFIG_SPI=y
CONFIG_SPI_MASTER=y
CONFIG_SPI_MPC83xx=y
I've had no time to set up hotplug/card detect features.
Actually my system boots with card plugged in and and I do a "insmod
mmc_spi.ko" -> card gets probed.
->mount -t vfat /dev/mmcblk0p1 /mnt/mmc
hope this helps.
cheers,
Andre
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