Prepare for adding 64-bit IDMAC descriptors by renaming current 32-bit
descriptor and its fields accordingly. While at it, make use of
virt_to_phys() to make it more obvious in which places the physical
addresses have to be used.
No functional change.
Signed-off-by: Sam Protsenko <semen.protse...@linaro.org>
---
Changes in v4:
- (none)
Changes in v3:
- (none)
Changes in v2:
- (none)
drivers/mmc/dw_mmc.c | 43 +++++++++++++++++++++++--------------------
1 file changed, 23 insertions(+), 20 deletions(-)
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index d73d58bcf7d7..3e7073f7de1b 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -20,11 +20,12 @@
#define PAGE_SIZE 4096
-struct dwmci_idmac {
- u32 flags;
- u32 cnt;
- u32 addr;
- u32 next_addr;
+/* Internal DMA Controller (IDMAC) descriptor for 32-bit addressing mode */
+struct dwmci_idmac32 {
+ u32 des0; /* Control descriptor */
+ u32 des1; /* Buffer size */
+ u32 des2; /* Buffer physical address */
+ u32 des3; /* Next descriptor physical address */
} __aligned(ARCH_DMA_MINALIGN);
static int dwmci_wait_reset(struct dwmci_host *host, u32 value)
@@ -42,22 +43,23 @@ static int dwmci_wait_reset(struct dwmci_host *host, u32
value)
return 0;
}
-static void dwmci_set_idma_desc(struct dwmci_idmac *idmac,
- u32 desc0, u32 desc1, u32 desc2)
+static void dwmci_set_idma_desc32(struct dwmci_idmac32 *desc, u32 control,
+ u32 buf_size, u32 buf_addr)
{
- struct dwmci_idmac *desc = idmac;
+ phys_addr_t desc_phys = virt_to_phys(desc);
+ u32 next_desc_phys = desc_phys + sizeof(struct dwmci_idmac32);
- desc->flags = desc0;
- desc->cnt = desc1;
- desc->addr = desc2;
- desc->next_addr = (ulong)desc + sizeof(struct dwmci_idmac);
+ desc->des0 = control;
+ desc->des1 = buf_size;
+ desc->des2 = buf_addr;
+ desc->des3 = next_desc_phys;
}
static void dwmci_prepare_desc(struct mmc_data *data,
- struct dwmci_idmac *cur_idmac,
+ struct dwmci_idmac32 *cur_idmac,
void *bounce_buffer)
{
- struct dwmci_idmac *desc = cur_idmac;
+ struct dwmci_idmac32 *desc32 = cur_idmac;
ulong data_start, data_end;
unsigned int blk_cnt, i;
@@ -65,6 +67,7 @@ static void dwmci_prepare_desc(struct mmc_data *data,
blk_cnt = data->blocks;
for (i = 0;; i++) {
+ phys_addr_t buf_phys = virt_to_phys(bounce_buffer);
unsigned int flags, cnt;
flags = DWMCI_IDMAC_OWN | DWMCI_IDMAC_CH;
@@ -76,22 +79,22 @@ static void dwmci_prepare_desc(struct mmc_data *data,
} else
cnt = data->blocksize * 8;
- dwmci_set_idma_desc(desc, flags, cnt,
- (ulong)bounce_buffer + i * PAGE_SIZE);
- desc++;
+ dwmci_set_idma_desc32(desc32, flags, cnt,
+ buf_phys + i * PAGE_SIZE);
+ desc32++;
if (blk_cnt <= 8)
break;
blk_cnt -= 8;
}
- data_end = (ulong)desc;
+ data_end = (ulong)desc32;
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,
+ struct dwmci_idmac32 *cur_idmac,
void *bounce_buffer)
{
unsigned long ctrl;
@@ -308,7 +311,7 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd
*cmd,
{
#endif
struct dwmci_host *host = mmc->priv;
- ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac,
+ ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac32, cur_idmac,
data ? DIV_ROUND_UP(data->blocks, 8) : 0);
int ret = 0, flags = 0, i;
u32 retry = 100000;
--
2.39.2
