1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/rpmsg/omaprpc/omap_rpc_tiler.c b/drivers/rpmsg/omaprpc/omap_rpc_tiler.c
new file mode 100644
index 0000000..d36fe1e
--- /dev/null
+++ b/drivers/rpmsg/omaprpc/omap_rpc_tiler.c
@@ -0,0 +1,59 @@
+/*
+ * OMAP Remote Procedure Call Driver.
+ *
+ * Copyright(c) 2012 Texas Instruments. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "omap_rpc_internal.h"
+
+/**
+ * tiler_stride_from_region() - Returns the stride value as seen by remote cores
+ * based on the local address given to the function. This stride value is valid
+ * for non-local cores only.
+ * @localphys:	The local physical address.
+ **/
+static inline long tiler_stride_from_region(phys_addr_t localphys)
+{
+	/*
+	 * The physical address range decoding of local addresses is as follows:
+	 *
+	 * 0x60000000 - 0x67FFFFFF : 8-bit region
+	 * 0x68000000 - 0x6FFFFFFF : 16-bit region
+	 * 0x70000000 - 0x77FFFFFF : 32-bit region
+	 * 0x77000000 - 0x7FFFFFFF : Page mode region
+	 */
+	switch (localphys & 0xf8000000) {	/* Mask out the lower bits */
+	case 0x60000000:	/* 8-bit  */
+		return 0x4000;	/* 16 KB of stride */
+	case 0x68000000:	/* 16-bit */
+	case 0x70000000:	/* 32-bit */
+		return 0x8000;	/* 32 KB of stride */
+	default:
+		return 0;
+	}
+}
+
+/**
+ * omaprpc_recalc_off() - Recalculated the unsigned offset in a buffer due to
+ * it's location in the TILER.
+ * @lpa:	local physical address
+ * @uoff:	unsigned offset
+ */
+long omaprpc_recalc_off(phys_addr_t lpa, long uoff)
+{
+	long stride = tiler_stride_from_region(lpa);
+	return (stride != 0) ? (stride * (uoff / PAGE_SIZE)) +
+	    (uoff & (PAGE_SIZE - 1)) : uoff;
+}