File: [local] / funnyos / dev / sdmmc / sdmmc_spi.c (download)
Revision 1.1, Thu Dec 20 15:23:15 2007 UTC (16 years, 6 months ago) by nbrk
Branch: MAIN
totally uncompleted implementation of SD/MMC protocol over SPI lines.
code is not finished yet, but commit it so i can hack at home
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/*
* $Id: sdmmc_spi.c,v 1.1 2007/12/20 15:23:15 nbrk Exp $
*/
#include <sys/types.h>
#include <sys/device.h>
#include <sys/bus_spi.h>
#include <dev/sdmmc/sdmmcvar.h>
#include <libkern/printf.h>
/*
* SD/MMC conversation over SPI bus.
*/
struct spisdmmc_dd {
struct spi_bus_handle *ss_sbhp;
// struct sdmmc_bus_handle;
};
int spisdmmc_attach(struct device *, uint32_t, uint8_t);
struct driver spisdmmc_dr = {
sizeof(struct spisdmmc_dd),
spisdmmc_attach,
NULL,
NULL
};
int
spisdmmc_attach(struct device *self, uint32_t loc, uint8_t flags)
{
struct spisdmmc_dd *ddp = self->dv_devdata;
ddp->ss_sbhp = self->dv_parent->dv_aux;
printf("SPI SD/MMC\n");
return(0);
}
int
spisdmmc_init(struct spisdmmc_dd *ddp)
{
uint8_t i, resp;
/*
* Apply 80 clock pulses.
* XXX assert CS. (NPCS0)
*/
for (i = 0; i < 9; i++)
spi_transmit(ddp->ss_sbhp, 0xff);
/*
* Apply 16 clocks.
* XXX deassert CS.
*/
for (i = 0; i < 2; i ++)
spi_transmit(ddp->ss_sbhp, 0xff);
/*
* Send CMD0_GO_IDLE_STATE.
*/
spisdmmc_send_command(ddp, CMD0_GO_IDLE_STATE, 0, CMD0_HARDCODED_CRC);
if (spisdmmc_get_response(ddp) != 0) {
printf("spisdmmc_init: CMD0_GO_IDLE_STATE failed with %d\n", resp);
return(-1);
}
}
void
spisdmmc_send_command(struct spisdmmc_dd *ddp, uint8_t cmd, uint32_t arg, uint32_t crc)
{
struct sdmmc_cmdframe sdcf;
uint8_t i;
/* construct frame */
sdcf = sdmmc_command(cmd, arg, crc);
/* transmit token */
spi_transmit(ddp->ss_sbhp, sdcf.sc_cmd);
/* transmit 32 bit argument XXX MSB first */
for(i = 0; i < 4; i++)
spi_transmit(ddp->ss_sbhp, ((sdcf.sc_arg & (0xff000000 >> i)) >> (8 * (4 - i + 1))) );
/* transmit CRC field */
spi_transmit(ddp->ss_sbhp, sdcf.sc_cmd)
}