@ -43,6 +43,13 @@
# include <asm/arch/sys_proto.h>
# include <asm/arch/dma.h>
/*
* CONFIG_MXS_MMC_DMA : This feature is highly experimental and has no
* performance benefit unless you operate the platform with
* data cache enabled . This is disabled by default , enable
* only if you know what you ' re doing .
*/
struct mxsmmc_priv {
int id ;
struct mx28_ssp_regs * regs ;
@ -66,8 +73,13 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
struct mx28_ssp_regs * ssp_regs = priv - > regs ;
uint32_t reg ;
int timeout ;
uint32_t data_count , cache_data_count ;
uint32_t data_count ;
uint32_t ctrl0 ;
# ifndef CONFIG_MXS_MMC_DMA
uint32_t * data_ptr ;
# else
uint32_t cache_data_count ;
# endif
debug ( " MMC%d: CMD%d \n " , mmc - > block_dev . dev , cmd - > cmdidx ) ;
@ -185,7 +197,9 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
return 0 ;
data_count = data - > blocksize * data - > blocks ;
timeout = MXSMMC_MAX_TIMEOUT ;
# ifdef CONFIG_MXS_MMC_DMA
if ( data_count % ARCH_DMA_MINALIGN )
cache_data_count = roundup ( data_count , ARCH_DMA_MINALIGN ) ;
else
@ -218,6 +232,38 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
invalidate_dcache_range ( ( uint32_t ) priv - > desc - > cmd . address ,
( uint32_t ) ( priv - > desc - > cmd . address + cache_data_count ) ) ;
}
# else
if ( data - > flags & MMC_DATA_READ ) {
data_ptr = ( uint32_t * ) data - > dest ;
while ( data_count & & - - timeout ) {
reg = readl ( & ssp_regs - > hw_ssp_status ) ;
if ( ! ( reg & SSP_STATUS_FIFO_EMPTY ) ) {
* data_ptr + + = readl ( & ssp_regs - > hw_ssp_data ) ;
data_count - = 4 ;
timeout = MXSMMC_MAX_TIMEOUT ;
} else
udelay ( 1000 ) ;
}
} else {
data_ptr = ( uint32_t * ) data - > src ;
timeout * = 100 ;
while ( data_count & & - - timeout ) {
reg = readl ( & ssp_regs - > hw_ssp_status ) ;
if ( ! ( reg & SSP_STATUS_FIFO_FULL ) ) {
writel ( * data_ptr + + , & ssp_regs - > hw_ssp_data ) ;
data_count - = 4 ;
timeout = MXSMMC_MAX_TIMEOUT ;
} else
udelay ( 1000 ) ;
}
}
if ( ! timeout ) {
printf ( " MMC%d: Data timeout with command %d (status 0x%08x)! \n " ,
mmc - > block_dev . dev , cmd - > cmdidx , reg ) ;
return COMM_ERR ;
}
# endif
/* Check data errors */
reg = readl ( & ssp_regs - > hw_ssp_status ) ;