mmc: block: support no access to boot partitions

Intel Medfield platform blocks access to eMMC boot partitions which
results in switch errors.  Since there is no access, mmcboot0/1
devices should not be created.  Add a host capability to reflect that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index b2aefea97048..aed5bc7245f7 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -236,6 +236,10 @@ struct mmc_host {
 #define MMC_CAP_CMD23           (1 << 30)       /* CMD23 supported. */
 #define MMC_CAP_HW_RESET        (1 << 31)       /* Hardware reset */
 
+        unsigned int            caps2;          /* More host capabilities */
+
+#define MMC_CAP2_BOOTPART_NOACC (1 << 0)        /* Boot partition no access */
+
         mmc_pm_flag_t           pm_caps;        /* supported pm features */
 
 #ifdef CONFIG_MMC_CLKGATE
@@ -404,4 +408,10 @@ static inline int mmc_host_cmd23(struct mmc_host *host)
 {
         return host->caps & MMC_CAP_CMD23;
 }
+
+static inline int mmc_boot_partition_access(struct mmc_host *host)
+{
+        return !(host->caps2 & MMC_CAP2_BOOTPART_NOACC);
+}
+
 #endif /* LINUX_MMC_HOST_H */