[src/trunk]: src/sys/arch/arm/samsung add a dma file to the EXYNOS rewrite

[marty <marty%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/146c96254226
branches:  trunk
changeset: 812319:146c96254226
user:      marty <marty%NetBSD.org@localhost>
date:      Fri Dec 11 04:05:54 2015 +0000

description:
add a dma file to the EXYNOS rewrite

diffstat:

 sys/arch/arm/samsung/exynos5422_dma.c |  77 +++++++++++++++++++++++++++++++++++
 1 files changed, 77 insertions(+), 0 deletions(-)

diffs (81 lines):

diff -r d5bc72ba1315 -r 146c96254226 sys/arch/arm/samsung/exynos5422_dma.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/samsung/exynos5422_dma.c     Fri Dec 11 04:05:54 2015 +0000
@@ -0,0 +1,77 @@
+/*     $NetBSD: exynos5422_dma.c,v 1.1 2015/12/11 04:05:54 marty Exp $ */
+
+/*-
+ * Copyright (c) 2012 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Nick Hudson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "opt_exynos.h"
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: exynos5422_dma.c,v 1.1 2015/12/11 04:05:54 marty Exp $");
+
+#define _ARM32_BUS_DMA_PRIVATE
+
+#include <sys/param.h>
+#include <sys/bus.h>
+
+#include <arm/samsung/exynos_reg.h>
+#include <arm/samsung/exynos_var.h>
+
+struct arm32_bus_dma_tag exynos_bus_dma_tag = {
+       _BUS_DMAMAP_FUNCS,
+       _BUS_DMAMEM_FUNCS,
+       _BUS_DMATAG_FUNCS,
+};
+
+struct arm32_dma_range exynos_coherent_dma_ranges[1] = {
+       [0] = {
+               .dr_sysbase = 0,        /* filled in */
+               .dr_busbase = 0,        /* filled in */
+               .dr_flags = _BUS_DMAMAP_COHERENT,
+       },
+};
+
+struct arm32_bus_dma_tag exynos_coherent_bus_dma_tag = {
+       ._ranges  = exynos_coherent_dma_ranges,
+       ._nranges = __arraycount(exynos_coherent_dma_ranges),
+       _BUS_DMAMAP_FUNCS,
+       _BUS_DMAMEM_FUNCS,
+       _BUS_DMATAG_FUNCS,
+};
+
+void
+exynos_dma_bootstrap(psize_t memsize)
+{
+       bus_addr_t dram_base =  EXYNOS5_SDRAM_PBASE;
+
+       KASSERT(dram_base);
+       exynos_coherent_dma_ranges[0].dr_sysbase = dram_base;
+       exynos_coherent_dma_ranges[0].dr_busbase = dram_base;
+       exynos_coherent_dma_ranges[0].dr_len = memsize;
+}
+