sd/mmc: enable 4-bit data transfers

It works, but performance is still unexpectedly low (getting about 50kB/s write speed) with almost no CPU load. Change-Id: I7da3ee70c8b379c4e6c2250d67f880c78635874f Reviewed-on: https://review.haiku-os.org/c/haiku/+/3630 Reviewed-by: Jérôme Duval <[email protected]>
2021-01-20 19:02:38 +00:00
parent d57b8f90e2
commit 34552f8e66
7 changed files with 93 additions and 7 deletions
@@ -81,6 +81,8 @@ typedef struct mmc_bus_interface {
 		// Execute a command that involves a data transfer.
 	void (*set_scan_semaphore)(void* controller, sem_id sem);
 		// Pass the semaphore used for device rescan to the bus controller
+	void (*set_bus_width)(void* controller, int width);
+		// Set the data bus width to 1, 4 or 8 bit mode.
 } mmc_bus_interface;


@@ -97,6 +99,8 @@ typedef struct mmc_device_interface {
 	status_t (*do_io)(device_node* controller, uint16_t rca,
 		uint8_t command, IOOperation* operation, bool offsetAsSectors);
 		// Execute a command that involves a data transfer.
+	void (*set_bus_width)(device_node* controller, int width);
+		// Set the data bus width to 1, 4 or 8 bit mode.
 } mmc_device_interface;