sd: Added creation of a block device for the entire SD card.

Also use DMA for writing if possible.

Author: DC-SWAT

kernel/arch/dreamcast/exports-naomi.txt

@@ -85,6 +85,7 @@ sd_read_blocks
 sd_write_blocks
 sd_get_size
 sd_blockdev_for_partition
+sd_blockdev_for_device
 
 # Timers
 timer_prime

kernel/arch/dreamcast/exports-pristine.txt

@@ -103,6 +103,7 @@ sd_read_blocks
 sd_write_blocks
 sd_get_size
 sd_blockdev_for_partition
+sd_blockdev_for_device
 
 # Timers
 timer_prime

kernel/arch/dreamcast/hardware/sd.c

@@ -141,7 +141,10 @@ static void sci_read_data_wrapper(uint8_t *data, size_t len) {
 }
 
 static void sci_write_data_wrapper(const uint8_t *data, size_t len) {
-    sci_spi_write_data(data, len);
+    if(len & 31)
+        sci_spi_write_data(data, len);
+    else
+        sci_spi_dma_write_data(data, len, NULL, NULL);
 }
 
 static void scif_shutdown_wrapper(void) {
@@ -810,3 +813,28 @@ int sd_blockdev_for_partition(int partition, kos_blockdev_t *rv,
     return 0;
 }
 
+int sd_blockdev_for_device(kos_blockdev_t *rv) {
+    sd_devdata_t *ddata;
+
+    if (!initted) {
+        errno = ENXIO;
+        return -1;
+    }
+
+    if (!rv) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    /* Allocate the device data */
+    if (!(ddata = (sd_devdata_t *)malloc(sizeof(sd_devdata_t)))) {
+        errno = ENOMEM;
+        return -1;
+    }
+
+    ddata->start_block = 0;
+    ddata->block_count = (sd_get_size() / 512);
+    rv->dev_data = ddata;
+
+    return 0;
+}

kernel/arch/dreamcast/include/dc/sd.h

@@ -202,6 +202,22 @@ uint64 sd_get_size(void);
 int sd_blockdev_for_partition(int partition, kos_blockdev_t *rv,
                               uint8 *partition_type);
 
+/** \brief  Get a block device for the SD card.
+
+    This function creates a block device descriptor for the attached SD card.
+    This block device is used to interface with various filesystems on the device.
+
+    \param  rv              Used to return the block device. Must be non-NULL.
+    \retval 0               On success.
+    \retval -1              On error, errno will be set as appropriate.
+
+    \par    Error Conditions:
+    \em     ENXIO - SD card support was not initialized
+    \em     EFAULT - rv was NULL
+    \em     ENOMEM - out of memory
+*/
+int sd_blockdev_for_device(kos_blockdev_t *rv);
+
 /** @} */
 
 __END_DECLS