spi: tegra: Fixing misc issues.

Following are the fixes;
- Supportng half duplex.
- Only using SW based CS.
- Write to readback with command register does not work. Fixing issue.
- Using cpu based transfer for smaller size and dma based for larger size.
- reading proper transfer status after every transaction.

bug 791149
bug 791780

Change-Id: I293b3f1b571276f5d8fe4ad4da67f827926e4b73
Reviewed-on: http://git-master/r/20581
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Tested-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-by: Amit Kamath <akamath@nvidia.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/include/linux/spi-tegra.h b/include/linux/spi-tegra.h
new file mode 100755
index 000000000000..2fe1af9c239e
--- /dev/null
+++ b/include/linux/spi-tegra.h
@@ -0,0 +1,29 @@
+/*
+ * include/linux/spi-tegra.c
+ *
+ * Copyright (C) 2011 NVIDIA Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef _LINUX_SPI_TEGRA_H
+#define _LINUX_SPI_TEGRA_H
+
+struct tegra_spi_platform_data {
+	bool is_dma_based;
+	int max_dma_buffer;
+	bool is_clkon_always;
+};
+#endif /* _LINUX_SPI_TEGRA_H */