mmc: dw_mmc: add support tuning scheme

For the speed modes HS200 and SDR104, tuning is needed to determine the
correct sampling point. Actual tuning procedure is provided by specific
host controller driver.  This patch defines the tuning command and
tuning data.  Additionally, 'struct dw_mci_slot' is moved to header
file to consider the extensive usages in driver.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index 81b29941c5b9..b281fdc6835f 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -184,6 +184,52 @@ extern int dw_mci_resume(struct dw_mci *host);
 #endif
 
 /**
+ * struct dw_mci_slot - MMC slot state
+ * @mmc: The mmc_host representing this slot.
+ * @host: The MMC controller this slot is using.
+ * @quirks: Slot-level quirks (DW_MCI_SLOT_QUIRK_XXX)
+ * @wp_gpio: If gpio_is_valid() we'll use this to read write protect.
+ * @ctype: Card type for this slot.
+ * @mrq: mmc_request currently being processed or waiting to be
+ *      processed, or NULL when the slot is idle.
+ * @queue_node: List node for placing this node in the @queue list of
+ *      &struct dw_mci.
+ * @clock: Clock rate configured by set_ios(). Protected by host->lock.
+ * @__clk_old: The last updated clock with reflecting clock divider.
+ *      Keeping track of this helps us to avoid spamming the console
+ *      with CONFIG_MMC_CLKGATE.
+ * @flags: Random state bits associated with the slot.
+ * @id: Number of this slot.
+ * @last_detect_state: Most recently observed card detect state.
+ */
+struct dw_mci_slot {
+        struct mmc_host         *mmc;
+        struct dw_mci           *host;
+
+        int                     quirks;
+        int                     wp_gpio;
+
+        u32                     ctype;
+
+        struct mmc_request      *mrq;
+        struct list_head        queue_node;
+
+        unsigned int            clock;
+        unsigned int            __clk_old;
+
+        unsigned long           flags;
+#define DW_MMC_CARD_PRESENT     0
+#define DW_MMC_CARD_NEED_INIT   1
+        int                     id;
+        int                     last_detect_state;
+};
+
+struct dw_mci_tuning_data {
+        const u8 *blk_pattern;
+        unsigned int blksz;
+};
+
+/**
  * dw_mci driver data - dw-mshc implementation specific driver data.
  * @caps: mmc subsystem specified capabilities of the controller(s).
  * @init: early implementation specific initialization.
@@ -203,5 +249,7 @@ struct dw_mci_drv_data {
         void            (*prepare_command)(struct dw_mci *host, u32 *cmdr);
         void            (*set_ios)(struct dw_mci *host, struct mmc_ios *ios);
         int             (*parse_dt)(struct dw_mci *host);
+        int             (*execute_tuning)(struct dw_mci_slot *slot, u32 opcode,
+                                        struct dw_mci_tuning_data *tuning_data);
 };
 #endif /* _DW_MMC_H_ */