davinci: Encapsulate SoC-specific data in a structure

Create a structure to encapsulate SoC-specific information.
This will assist in generalizing code so it can be used by
different SoCs that have similar hardware but with minor
differences such as having a different base address.

The idea is that the code for each SoC fills out a structure
with the correct information.  The board-specific code then
calls the SoC init routine which in turn will call a common
init routine that makes a copy of the structure, maps in I/O
regions, etc.

After initialization, code can get a pointer to the structure
by calling davinci_get_soc_info().  Eventually, the common
init routine will make a copy of all of the data pointed to
by the structure so the original data can be made __init_data.
That way the data for SoC's that aren't being used won't consume
memory for the entire life of the kernel.

The structure will be extended in subsequent patches but
initially, it holds the map_desc structure for any I/O
regions the SoC/board wants statically mapped.

Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/common.c b/arch/arm/mach-davinci/common.c
new file mode 100644
index 0000000..9a5486f
--- /dev/null
+++ b/arch/arm/mach-davinci/common.c
@@ -0,0 +1,55 @@
+/*
+ * Code commons to all DaVinci SoCs.
+ *
+ * Author: Mark A. Greer <mgreer@mvista.com>
+ *
+ * 2009 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+#include <linux/module.h>
+#include <linux/io.h>
+
+#include <asm/tlb.h>
+#include <asm/mach/map.h>
+
+#include <mach/common.h>
+
+struct davinci_soc_info davinci_soc_info;
+EXPORT_SYMBOL(davinci_soc_info);
+
+void __init davinci_common_init(struct davinci_soc_info *soc_info)
+{
+	int ret;
+
+	if (!soc_info) {
+		ret = -EINVAL;
+		goto err;
+	}
+
+	memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
+
+	if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
+		iotable_init(davinci_soc_info.io_desc,
+				davinci_soc_info.io_desc_num);
+
+	/*
+	 * Normally devicemaps_init() would flush caches and tlb after
+	 * mdesc->map_io(), but we must also do it here because of the CPU
+	 * revision check below.
+	 */
+	local_flush_tlb_all();
+	flush_cache_all();
+
+	/*
+	 * We want to check CPU revision early for cpu_is_xxxx() macros.
+	 * IO space mapping must be initialized before we can do that.
+	 */
+	davinci_check_revision();
+
+	return;
+
+err:
+	pr_err("davinci_common_init: SoC Initialization failed\n");
+}