MMC headers learn about SPI

Teach the MMC/SD/SDIO system headers that some hosts use SPI mode

 - New host capabilities and status bits
    * MMC_CAP_SPI, with mmc_host_is_spi() test
    * mmc_host.use_spi_crc flag

 - SPI-specific declarations:
    * Response types, MMC_RSP_SPI_R*
    * Two SPI-only commands
    * Status bits used native to SPI:  R1_SPI_*, R2_SPI_*

 - Fix a few (unrelated) whitespace bugs in the headers.

 - Reorder a few mmc_host fields, removing several bytes of padding

None of these changes affect current code.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 11 insertions, 5 deletions

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 3fd197962f73..76eef94782f8 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -91,6 +91,7 @@ struct mmc_host {
 #define MMC_CAP_MMC_HIGHSPEED   (1 << 2)        /* Can do MMC high-speed timing */
 #define MMC_CAP_SD_HIGHSPEED    (1 << 3)        /* Can do SD high-speed timing */
 #define MMC_CAP_SDIO_IRQ        (1 << 4)        /* Can signal pending SDIO IRQs */
+#define MMC_CAP_SPI             (1 << 5)        /* Talks only SPI protocols */
 
         /* host specific block data */
         unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
@@ -107,6 +108,14 @@ struct mmc_host {
         struct mmc_ios          ios;            /* current io bus settings */
         u32                     ocr;            /* the current OCR setting */
 
+        /* group bitfields together to minimize padding */
+        unsigned int            use_spi_crc:1;
+        unsigned int            claimed:1;      /* host exclusively claimed */
+        unsigned int            bus_dead:1;     /* bus has been released */
+#ifdef CONFIG_MMC_DEBUG
+        unsigned int            removed:1;      /* host is being removed */
+#endif
+
         unsigned int            mode;           /* current card mode of host */
 #define MMC_MODE_MMC            0
 #define MMC_MODE_SD             1
@@ -114,16 +123,11 @@ struct mmc_host {
         struct mmc_card         *card;          /* device attached to this host */
 
         wait_queue_head_t       wq;
-        unsigned int            claimed:1;      /* host exclusively claimed */
 
         struct delayed_work     detect;
-#ifdef CONFIG_MMC_DEBUG
-        unsigned int            removed:1;      /* host is being removed */
-#endif
 
         const struct mmc_bus_ops *bus_ops;      /* current bus driver */
         unsigned int            bus_refs;       /* reference counter */
-        unsigned int            bus_dead:1;     /* bus has been released */
 
         unsigned int            sdio_irqs;
         struct task_struct      *sdio_irq_thread;
@@ -142,6 +146,8 @@ static inline void *mmc_priv(struct mmc_host *host)
         return (void *)host->private;
 }
 
+#define mmc_host_is_spi(host)   ((host)->caps & MMC_CAP_SPI)
+
 #define mmc_dev(x)      ((x)->parent)
 #define mmc_classdev(x) (&(x)->class_dev)
 #define mmc_hostname(x) ((x)->class_dev.bus_id)