[PATCH v5 08/38] mmc: dw_mmc: Extract setting the DMA descriptor into a separate routine
Sam Protsenko
semen.protsenko at linaro.org
Thu Aug 8 05:14:14 CEST 2024
Make dwmci_prepare_data() function easier to read by extracting the
preparation of IDMAC descriptor into a dedicated function.
No functional change.
Signed-off-by: Sam Protsenko <semen.protsenko at linaro.org>
Reviewed-by: Quentin Schulz <quentin.schulz at cherry.de>
---
Changes in v5:
- (none)
Changes in v4:
- Rebased on top of the most recent master
Changes in v3:
- (none)
Changes in v2:
- Added R-b tag from Quentin
drivers/mmc/dw_mmc.c | 51 +++++++++++++++++++++++++++-----------------
1 file changed, 31 insertions(+), 20 deletions(-)
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 8fc26399034b..d73d58bcf7d7 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -53,46 +53,57 @@ static void dwmci_set_idma_desc(struct dwmci_idmac *idmac,
desc->next_addr = (ulong)desc + sizeof(struct dwmci_idmac);
}
-static void dwmci_prepare_data(struct dwmci_host *host,
- struct mmc_data *data,
+static void dwmci_prepare_desc(struct mmc_data *data,
struct dwmci_idmac *cur_idmac,
void *bounce_buffer)
{
- unsigned long ctrl;
- unsigned int i = 0, flags, cnt, blk_cnt;
+ struct dwmci_idmac *desc = cur_idmac;
ulong data_start, data_end;
+ unsigned int blk_cnt, i;
+ data_start = (ulong)cur_idmac;
blk_cnt = data->blocks;
- dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
-
- /* Clear IDMAC interrupt */
- dwmci_writel(host, DWMCI_IDSTS, 0xFFFFFFFF);
+ for (i = 0;; i++) {
+ unsigned int flags, cnt;
- data_start = (ulong)cur_idmac;
- dwmci_writel(host, DWMCI_DBADDR, (ulong)cur_idmac);
-
- do {
- flags = DWMCI_IDMAC_OWN | DWMCI_IDMAC_CH ;
- flags |= (i == 0) ? DWMCI_IDMAC_FS : 0;
+ flags = DWMCI_IDMAC_OWN | DWMCI_IDMAC_CH;
+ if (i == 0)
+ flags |= DWMCI_IDMAC_FS;
if (blk_cnt <= 8) {
flags |= DWMCI_IDMAC_LD;
cnt = data->blocksize * blk_cnt;
} else
cnt = data->blocksize * 8;
- dwmci_set_idma_desc(cur_idmac, flags, cnt,
- (ulong)bounce_buffer + (i * PAGE_SIZE));
+ dwmci_set_idma_desc(desc, flags, cnt,
+ (ulong)bounce_buffer + i * PAGE_SIZE);
+ desc++;
- cur_idmac++;
if (blk_cnt <= 8)
break;
blk_cnt -= 8;
- i++;
- } while(1);
+ }
- data_end = (ulong)cur_idmac;
+ data_end = (ulong)desc;
flush_dcache_range(data_start, roundup(data_end, ARCH_DMA_MINALIGN));
+}
+
+static void dwmci_prepare_data(struct dwmci_host *host,
+ struct mmc_data *data,
+ struct dwmci_idmac *cur_idmac,
+ void *bounce_buffer)
+{
+ unsigned long ctrl;
+
+ dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
+
+ /* Clear IDMAC interrupt */
+ dwmci_writel(host, DWMCI_IDSTS, 0xFFFFFFFF);
+
+ dwmci_writel(host, DWMCI_DBADDR, (ulong)cur_idmac);
+
+ dwmci_prepare_desc(data, cur_idmac, bounce_buffer);
ctrl = dwmci_readl(host, DWMCI_CTRL);
ctrl |= DWMCI_IDMAC_EN | DWMCI_DMA_EN;
--
2.39.2
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