mmc: add mmc card sleep and awake support
[linux-2.6.git] / drivers / mmc / core / mmc_ops.c
index 34ce270..355c604 100644 (file)
@@ -57,6 +57,42 @@ int mmc_deselect_cards(struct mmc_host *host)
        return _mmc_select_card(host, NULL);
 }
 
+int mmc_card_sleepawake(struct mmc_host *host, int sleep)
+{
+       struct mmc_command cmd;
+       struct mmc_card *card = host->card;
+       int err;
+
+       if (sleep)
+               mmc_deselect_cards(host);
+
+       memset(&cmd, 0, sizeof(struct mmc_command));
+
+       cmd.opcode = MMC_SLEEP_AWAKE;
+       cmd.arg = card->rca << 16;
+       if (sleep)
+               cmd.arg |= 1 << 15;
+
+       cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+       err = mmc_wait_for_cmd(host, &cmd, 0);
+       if (err)
+               return err;
+
+       /*
+        * If the host does not wait while the card signals busy, then we will
+        * will have to wait the sleep/awake timeout.  Note, we cannot use the
+        * SEND_STATUS command to poll the status because that command (and most
+        * others) is invalid while the card sleeps.
+        */
+       if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
+               mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
+
+       if (!sleep)
+               err = mmc_select_card(card);
+
+       return err;
+}
+
 int mmc_go_idle(struct mmc_host *host)
 {
        int err;