mmc: implement SD-combo (IO+mem) support

Signed-off-by: Michal Miroslaw <mirq-linux@rere.qmqm.pl>
Cc: Adrian Hunter <adrian.hunter@nokia.com>
Cc: Chris Ball <cjb@laptop.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 133 insertions, 23 deletions

diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 49d9dcaeca49..7cd9749dc21d 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -37,6 +37,8 @@ static ssize_t mmc_type_show(struct device *dev,
                 return sprintf(buf, "SD\n");
         case MMC_TYPE_SDIO:
                 return sprintf(buf, "SDIO\n");
+        case MMC_TYPE_SD_COMBO:
+                return sprintf(buf, "SDcombo\n");
         default:
                 return -EFAULT;
         }
@@ -74,6 +76,9 @@ mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
         case MMC_TYPE_SDIO:
                 type = "SDIO";
                 break;
+        case MMC_TYPE_SD_COMBO:
+                type = "SDcombo";
+                break;
         default:
                 type = NULL;
         }
@@ -239,6 +244,10 @@ int mmc_add_card(struct mmc_card *card)
         case MMC_TYPE_SDIO:
                 type = "SDIO";
                 break;
+        case MMC_TYPE_SD_COMBO:
+                type = "SD-combo";
+                if (mmc_card_blockaddr(card))
+                        type = "SDHC-combo";
         default:
                 type = "?";
                 break;
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 569e94da844c..b69ce91b11e1 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1099,8 +1099,15 @@ void mmc_rescan(struct work_struct *work)
          */
         err = mmc_send_io_op_cond(host, 0, &ocr);
         if (!err) {
-                if (mmc_attach_sdio(host, ocr))
-                        mmc_power_off(host);
+                if (mmc_attach_sdio(host, ocr)) {
+                        mmc_claim_host(host);
+                        /* try SDMEM (but not MMC) even if SDIO is broken */
+                        if (mmc_send_app_op_cond(host, 0, &ocr))
+                                goto out_fail;
+
+                        if (mmc_attach_sd(host, ocr))
+                                mmc_power_off(host);
+                }
                 goto out;
         }
 
@@ -1124,6 +1131,7 @@ void mmc_rescan(struct work_struct *work)
                 goto out;
         }
 
+out_fail:
         mmc_release_host(host);
         mmc_power_off(host);
 
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 47d1708810bd..b0b6ce93e519 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -160,9 +160,7 @@ static int sdio_enable_wide(struct mmc_card *card)
         if (ret)
                 return ret;
 
-        mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
-
-        return 0;
+        return 1;
 }
 
 /*
@@ -222,10 +220,34 @@ static int sdio_disable_wide(struct mmc_card *card)
         return 0;
 }
 
+
+static int sdio_enable_4bit_bus(struct mmc_card *card)
+{
+        int err;
+
+        if (card->type == MMC_TYPE_SDIO)
+                return sdio_enable_wide(card);
+
+        if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
+                (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
+                err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
+                if (err)
+                        return err;
+        } else
+                return 0;
+
+        err = sdio_enable_wide(card);
+        if (err <= 0)
+                mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
+
+        return err;
+}
+
+
 /*
  * Test if the card supports high-speed mode and, if so, switch to it.
  */
-static int sdio_enable_hs(struct mmc_card *card)
+static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 {
         int ret;
         u8 speed;
@@ -240,7 +262,10 @@ static int sdio_enable_hs(struct mmc_card *card)
         if (ret)
                 return ret;
 
-        speed |= SDIO_SPEED_EHS;
+        if (enable)
+                speed |= SDIO_SPEED_EHS;
+        else
+                speed &= ~SDIO_SPEED_EHS;
 
         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
         if (ret)
@@ -249,6 +274,24 @@ static int sdio_enable_hs(struct mmc_card *card)
         return 1;
 }
 
+/*
+ * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
+ */
+static int sdio_enable_hs(struct mmc_card *card)
+{
+        int ret;
+
+        ret = mmc_sdio_switch_hs(card, true);
+        if (ret <= 0 || card->type == MMC_TYPE_SDIO)
+                return ret;
+
+        ret = mmc_sd_switch_hs(card);
+        if (ret <= 0)
+                mmc_sdio_switch_hs(card, false);
+
+        return ret;
+}
+
 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 {
         unsigned max_dtr;
@@ -265,6 +308,9 @@ static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
                 max_dtr = card->cis.max_dtr;
         }
 
+        if (card->type == MMC_TYPE_SD_COMBO)
+                max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
+
         return max_dtr;
 }
 
@@ -310,7 +356,24 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
                 goto err;
         }
 
-        card->type = MMC_TYPE_SDIO;
+        err = mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid);
+
+        if (!err) {
+                card->type = MMC_TYPE_SD_COMBO;
+
+                if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
+                    memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
+                        mmc_remove_card(card);
+                        return -ENOENT;
+                }
+        } else {
+                card->type = MMC_TYPE_SDIO;
+
+                if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
+                        mmc_remove_card(card);
+                        return -ENOENT;
+                }
+        }
 
         /*
          * Call the optional HC's init_card function to handle quirks.
@@ -330,6 +393,17 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
         }
 
         /*
+         * Read CSD, before selecting the card
+         */
+        if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
+                err = mmc_sd_get_csd(host, card);
+                if (err)
+                        return err;
+
+                mmc_decode_cid(card);
+        }
+
+        /*
          * Select card, as all following commands rely on that.
          */
         if (!powered_resume && !mmc_host_is_spi(host)) {
@@ -356,14 +430,33 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
                 int same = (card->cis.vendor == oldcard->cis.vendor &&
                             card->cis.device == oldcard->cis.device);
                 mmc_remove_card(card);
-                if (!same) {
-                        err = -ENOENT;
-                        goto err;
-                }
+                if (!same)
+                        return -ENOENT;
+
                 card = oldcard;
                 return 0;
         }
 
+        if (card->type == MMC_TYPE_SD_COMBO) {
+                err = mmc_sd_setup_card(host, card, oldcard != NULL);
+                /* handle as SDIO-only card if memory init failed */
+                if (err) {
+                        mmc_go_idle(host);
+                        if (mmc_host_is_spi(host))
+                                /* should not fail, as it worked previously */
+                                mmc_spi_set_crc(host, use_spi_crc);
+                        card->type = MMC_TYPE_SDIO;
+                } else
+                        card->dev.type = &sd_type;
+        }
+
+        /*
+         * If needed, disconnect card detection pull-up resistor.
+         */
+        err = sdio_disable_cd(card);
+        if (err)
+                goto remove;
+
         /*
          * Switch to high-speed (if supported).
          */
@@ -381,8 +474,10 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
         /*
          * Switch to wider bus (if supported).
          */
-        err = sdio_enable_wide(card);
-        if (err)
+        err = sdio_enable_4bit_bus(card);
+        if (err > 0)
+                mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
+        else if (err)
                 goto remove;
 
         if (!oldcard)
@@ -496,9 +591,14 @@ static int mmc_sdio_resume(struct mmc_host *host)
         mmc_claim_host(host);
         err = mmc_sdio_init_card(host, host->ocr, host->card,
                                  (host->pm_flags & MMC_PM_KEEP_POWER));
-        if (!err)
+        if (!err) {
                 /* We may have switched to 1-bit mode during suspend. */
-                err = sdio_enable_wide(host->card);
+                err = sdio_enable_4bit_bus(host->card);
+                if (err > 0) {
+                        mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
+                        err = 0;
+                }
+        }
         if (!err && host->sdio_irqs)
                 mmc_signal_sdio_irq(host);
         mmc_release_host(host);
@@ -583,13 +683,6 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
         card->sdio_funcs = 0;
 
         /*
-         * If needed, disconnect card detection pull-up resistor.
-         */
-        err = sdio_disable_cd(card);
-        if (err)
-                goto remove;
-
-        /*
          * Initialize (but don't add) all present functions.
          */
         for (i = 0; i < funcs; i++, card->sdio_funcs++) {