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mmc: dw_mmc: split out preparation of desc for IDMAC32 and IDMAC64 

We intend to add more check for descriptors when
preparing desc. Let's spilt out the separate body
to make the dw_mci_translate_sglist not so lengthy.
After spliting out these two functions, we could
remove dw_mci_translate_sglist and call both of them
when staring idmac.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shawn Lin 2016-09-02 12:14:36 +08:00 committed by Ulf Hansson
parent 1712c9373f
commit ec0baaa6b3
1 changed files with 93 additions and 84 deletions
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27
drivers/mmc/host/dw_mmc.c
View File

@ -467,14 +467,13 @@ static void dw_mci_dmac_complete_dma(void *arg)
}
}
static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
static inline void dw_mci_prepare_desc64(struct dw_mci *host,
struct mmc_data *data,
unsigned int sg_len)
{
unsigned int desc_len;
int i;
if (host->dma_64bit_address == 1) {
struct idmac_desc_64addr *desc_first, *desc_last, *desc;
int i;
desc_first = desc_last = desc = host->sg_cpu;
@ -517,9 +516,16 @@ static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
/* Set last descriptor */
desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
desc_last->des0 |= IDMAC_DES0_LD;
}
} else {
static inline void dw_mci_prepare_desc32(struct dw_mci *host,
struct mmc_data *data,
unsigned int sg_len)
{
unsigned int desc_len;
struct idmac_desc *desc_first, *desc_last, *desc;
int i;
desc_first = desc_last = desc = host->sg_cpu;
@ -563,16 +569,19 @@ static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH |
IDMAC_DES0_DIC));
desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD);
}
wmb(); /* drain writebuffer */
}
static int dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
{
u32 temp;
dw_mci_translate_sglist(host, host->data, sg_len);
if (host->dma_64bit_address == 1)
dw_mci_prepare_desc64(host, host->data, sg_len);
else
dw_mci_prepare_desc32(host, host->data, sg_len);
/* drain writebuffer */
wmb();
/* Make sure to reset DMA in case we did PIO before this */
dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET);