libpayload: New AHCI, ATA and ATAPI drivers

This adds a new interface for storage devices. A driver for ATA and
ATAPI drives on AHCI host controllers comes along.

The interface is very simple and was designed to match FILO's needs.
It consists of three functions:

  void storage_initialize(void);
  Initializes controllers. Should be called once at startup.

  storage_poll_t storage_probe(size_t dev_num);
     with typedef enum {
            POLL_NO_DEVICE      = -2,
            POLL_ERROR          = -1,
            POLL_NO_MEDIUM      =  0,
            POLL_MEDIUM_PRESENT =  1,
          } storage_poll_t;
  Looks for a drive with number dev_num (drives are counted from
  zero) and polls for a medium in the drive if appropriate.

  int storage_read_blocks512(size_t dev_num,
                             u64 start, size_t count,
                             unsigned char *buf);
  Reads count blocks of 512 bytes from block start of drive dev_num
  into buf.

Change-Id: I1c85796b7f8e379ff3817a61b1837636b57e182b
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/1622
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Peter Stuge <peter@stuge.se>

1 files changed, 7 insertions, 0 deletions

diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h
index 2deb9613a1..c3729e2b4d 100644
--- a/payloads/libpayload/include/libpayload.h
+++ b/payloads/libpayload/include/libpayload.h
@@ -119,6 +119,13 @@ void rtc_read_clock(struct tm *tm);
 /** @} */
 
 /**
+ * @defgroup storage driver functions
+ * @{
+ */
+void storage_initialize(void);
+/** @} */
+
+/**
  * @defgroup usb USB functions
  * @{
  */