- * Prepare a dma read
- */
-static void at91_mci_pre_dma_read(struct at91mci_host *host)
-{
- int i;
- struct scatterlist *sg;
- struct mmc_command *cmd;
- struct mmc_data *data;
-
- pr_debug("pre dma read\n");
-
- cmd = host->cmd;
- if (!cmd) {
- pr_debug("no command\n");
- return;
- }
-
- data = cmd->data;
- if (!data) {
- pr_debug("no data\n");
- return;
- }
-
- for (i = 0; i < 2; i++) {
- /* nothing left to transfer */
- if (host->transfer_index >= data->sg_len) {
- pr_debug("Nothing left to transfer (index = %d)\n", host->transfer_index);
- break;
- }
-
- /* Check to see if this needs filling */
- if (i == 0) {
- if (at91_mci_read(host, ATMEL_PDC_RCR) != 0) {
- pr_debug("Transfer active in current\n");
- continue;
- }
- }
- else {
- if (at91_mci_read(host, ATMEL_PDC_RNCR) != 0) {
- pr_debug("Transfer active in next\n");
- continue;
- }
- }
-
- /* Setup the next transfer */
- pr_debug("Using transfer index %d\n", host->transfer_index);
-
- sg = &data->sg[host->transfer_index++];
- pr_debug("sg = %p\n", sg);
-
- sg->dma_address = dma_map_page(NULL, sg_page(sg), sg->offset, sg->length, DMA_FROM_DEVICE);
-
- pr_debug("dma address = %08X, length = %d\n", sg->dma_address, sg->length);
-
- if (i == 0) {
- at91_mci_write(host, ATMEL_PDC_RPR, sg->dma_address);
- at91_mci_write(host, ATMEL_PDC_RCR, (data->blksz & 0x3) ? sg->length : sg->length / 4);
- }
- else {
- at91_mci_write(host, ATMEL_PDC_RNPR, sg->dma_address);
- at91_mci_write(host, ATMEL_PDC_RNCR, (data->blksz & 0x3) ? sg->length : sg->length / 4);
- }
- }
-
- pr_debug("pre dma read done\n");
-}
-
-/*