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.protsenko@linaro.org --- 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 8bec43f0bd16..a77023ff4cd6 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;