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, 18 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/dm644x.c b/arch/arm/mach-davinci/dm644x.c
index 0419d571bdca..79f113698b0b 100644
--- a/arch/arm/mach-davinci/dm644x.c
+++ b/arch/arm/mach-davinci/dm644x.c
@@ -13,6 +13,8 @@
 #include <linux/clk.h>
 #include <linux/platform_device.h>
 
+#include <asm/mach/map.h>
+
 #include <mach/dm644x.h>
 #include <mach/clock.h>
 #include <mach/cputype.h>
@@ -20,6 +22,7 @@
 #include <mach/irqs.h>
 #include <mach/psc.h>
 #include <mach/mux.h>
+#include <mach/common.h>
 
 #include "clock.h"
 #include "mux.h"
@@ -463,8 +466,23 @@ void dm644x_init_emac(struct emac_platform_data *unused) {}
 
 #endif
 
+static struct map_desc dm644x_io_desc[] = {
+        {
+                .virtual        = IO_VIRT,
+                .pfn            = __phys_to_pfn(IO_PHYS),
+                .length         = IO_SIZE,
+                .type           = MT_DEVICE
+        },
+};
+
+static struct davinci_soc_info davinci_soc_info_dm644x = {
+        .io_desc                = dm644x_io_desc,
+        .io_desc_num            = ARRAY_SIZE(dm644x_io_desc),
+};
+
 void __init dm644x_init(void)
 {
+        davinci_common_init(&davinci_soc_info_dm644x);
         davinci_clk_init(dm644x_clks);
         davinci_mux_register(dm644x_pins, ARRAY_SIZE(dm644x_pins));
 }