Allow card reader bridge driver to report maximum supported transfer size.

sdhci supports up to 65535 blocks transfers, at91_mci - one block.

Enable multiblock operations disabled before to follow at91_mci driver
limitations.

Reviewed by:	imp@

6 files changed, 16 insertions, 8 deletions

diff --git a/sys/arm/at91/at91_mci.c b/sys/arm/at91/at91_mci.c
index 0b3aae3..85945ad 100644
--- a/sys/arm/at91/at91_mci.c
+++ b/sys/arm/at91/at91_mci.c
@@ -642,6 +642,9 @@ at91_mci_read_ivar(device_t bus, device_t child, int which, u_char *result)
 	case MMCBR_IVAR_VDD:
 		*(int *)result = sc->host.ios.vdd;
 		break;
+	case MMCBR_IVAR_MAX_DATA:
+		*(int *)result = 1;
+		break;
 	}
 	return (0);
 }
@@ -682,6 +685,7 @@ at91_mci_write_ivar(device_t bus, device_t child, int which, uintptr_t value)
 	case MMCBR_IVAR_HOST_OCR:
 	case MMCBR_IVAR_F_MIN:
 	case MMCBR_IVAR_F_MAX:
+	case MMCBR_IVAR_MAX_DATA:
 		return (EINVAL);
 	}
 	return (0);
diff --git a/sys/dev/mmc/mmc.c b/sys/dev/mmc/mmc.c
index c6bce35..bea8c3b 100644
--- a/sys/dev/mmc/mmc.c
+++ b/sys/dev/mmc/mmc.c
@@ -1343,6 +1343,9 @@ mmc_read_ivar(device_t bus, device_t child, int which, u_char *result)
 	case MMC_IVAR_ERASE_SECTOR:
 		*(int *)result = ivar->erase_sector;
 		break;
+	case MMC_IVAR_MAX_DATA:
+		*(int *)result = mmcbr_get_max_data(bus);
+		break;
 	}
 	return (0);
 }
diff --git a/sys/dev/mmc/mmcbrvar.h b/sys/dev/mmc/mmcbrvar.h
index 7778139..1effa14 100644
--- a/sys/dev/mmc/mmcbrvar.h
+++ b/sys/dev/mmc/mmcbrvar.h
@@ -72,6 +72,7 @@ enum mmcbr_device_ivars {
     MMCBR_IVAR_VDD,
     MMCBR_IVAR_CAPS,
     MMCBR_IVAR_TIMING,
+    MMCBR_IVAR_MAX_DATA,
 //    MMCBR_IVAR_,
 };
 
@@ -94,6 +95,7 @@ MMCBR_ACCESSOR(power_mode, POWER_MODE, int)
 MMCBR_ACCESSOR(vdd, VDD, int)
 MMCBR_ACCESSOR(caps, CAPS, int)
 MMCBR_ACCESSOR(timing, TIMING, int)
+MMCBR_ACCESSOR(max_data, MAX_DATA, int)
 
 static int __inline
 mmcbr_update_ios(device_t dev)
diff --git a/sys/dev/mmc/mmcsd.c b/sys/dev/mmc/mmcsd.c
index 5e6440b..428d215 100644
--- a/sys/dev/mmc/mmcsd.c
+++ b/sys/dev/mmc/mmcsd.c
@@ -81,8 +81,6 @@ struct mmcsd_softc {
 	int running;
 };
 
-#define	MULTI_BLOCK_BROKEN
-
 /* bus entry points */
 static int mmcsd_probe(device_t dev);
 static int mmcsd_attach(device_t dev);
@@ -235,12 +233,7 @@ mmcsd_rw(struct mmcsd_softc *sc, struct bio *bp)
 	while (block < end) {
 		char *vaddr = bp->bio_data +
 		    (block - bp->bio_pblkno) * sz;
-		int numblocks;
-#ifdef MULTI_BLOCK
-		numblocks = end - block;
-#else
-		numblocks = 1;
-#endif
+		int numblocks = min(end - block, mmc_get_max_data(dev));
 		memset(&req, 0, sizeof(req));
     		memset(&cmd, 0, sizeof(cmd));
 		memset(&stop, 0, sizeof(stop));
diff --git a/sys/dev/mmc/mmcvar.h b/sys/dev/mmc/mmcvar.h
index 5a0e437..9126439 100644
--- a/sys/dev/mmc/mmcvar.h
+++ b/sys/dev/mmc/mmcvar.h
@@ -68,6 +68,7 @@ enum mmc_device_ivars {
     MMC_IVAR_CARD_TYPE,
     MMC_IVAR_BUS_WIDTH,
     MMC_IVAR_ERASE_SECTOR,
+    MMC_IVAR_MAX_DATA,
 //    MMC_IVAR_,
 };
 
@@ -87,5 +88,6 @@ MMC_ACCESSOR(high_cap, HIGH_CAP, int)
 MMC_ACCESSOR(card_type, CARD_TYPE, int)
 MMC_ACCESSOR(bus_width, BUS_WIDTH, int)
 MMC_ACCESSOR(erase_sector, ERASE_SECTOR, int)
+MMC_ACCESSOR(max_data, MAX_DATA, int)
 
 #endif /* DEV_MMC_MMCVAR_H */
diff --git a/sys/dev/sdhci/sdhci.c b/sys/dev/sdhci/sdhci.c
index e7dd9c5..dcc33b0 100644
--- a/sys/dev/sdhci/sdhci.c
+++ b/sys/dev/sdhci/sdhci.c
@@ -1440,6 +1440,9 @@ sdhci_read_ivar(device_t bus, device_t child, int which, u_char *result)
 	case MMCBR_IVAR_TIMING:
 		*(int *)result = slot->host.ios.timing;
 		break;
+	case MMCBR_IVAR_MAX_DATA:
+		*(int *)result = 65535;
+		break;
 	}
 	return (0);
 }
@@ -1494,6 +1497,7 @@ sdhci_write_ivar(device_t bus, device_t child, int which, uintptr_t value)
 	case MMCBR_IVAR_HOST_OCR:
 	case MMCBR_IVAR_F_MIN:
 	case MMCBR_IVAR_F_MAX:
+	case MMCBR_IVAR_MAX_DATA:
 		return (EINVAL);
 	}
 	return (0);