ipq806x: Break apart large transfers in spi_xfer()

The current spi_xfer() function sets the count in hardware and then
loops while waiting for the requested number of bytes to be sent or
received. However, the number of bytes to be transferred may exceed
the maximum count that can be programmed into the controller.

This patch re-factors spi_xfer() to split the low-level FIFO handling
portions for transmit/receive into their own functions to be called
by loops in spi_xfer() which will break large transfers into smaller
ones.

BUG=chrome-os-partner:30904
BRANCH=storm
TEST=built and booted with a >64KB payload on Storm

Original-Change-Id: I70743487996cf08cfc602449f2181a7fcd99bfa4
Original-Signed-off-by: David Hendricks <dhendrix@chromium.org>
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/209838
Original-Reviewed-by: Trevor Bourget <tbourget@codeaurora.org>
Original-Tested-by: Trevor Bourget <tbourget@codeaurora.org>
(cherry picked from commit 5ec28de11f12c2438356f45ce978a17fbb603bf7)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I0033e0dd96006cfd30a7a4f5e5a052f677e05108
Reviewed-on: http://review.coreboot.org/8676
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

0 files changed, 0 insertions, 0 deletions