cpu/allwinner/a10: Add minimal ramstage driver

Change-Id: I857755976b17b0e492c086162f395a77933eeed8
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/4698
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/src/cpu/allwinner/a10/cpu.c b/src/cpu/allwinner/a10/cpu.c
new file mode 100644
index 0000000000..e0d4cdf4d5
--- /dev/null
+++ b/src/cpu/allwinner/a10/cpu.c
@@ -0,0 +1,48 @@
+/*
+ * Ramstage initialization for Allwinner CPUs
+ *
+ * Copyright (C) 2014 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+ * Subject to the GNU GPL v2, or (at your option) any later version.
+ */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <cpu/cpu.h>
+#include <cbmem.h>
+
+
+static void cpu_enable_resources(device_t dev)
+{
+	ram_resource(dev, 0, CONFIG_SYS_SDRAM_BASE >> 10,
+		     CONFIG_DRAM_SIZE_MB << 10);
+	/* TODO: Declare CBFS cache as reserved? There's no guarantee we won't
+	 * overwrite it. It seems to stay intact, being so high in RAM
+	 */
+}
+
+static void cpu_init(device_t dev)
+{
+	/* TODO: Check if anything else needs to be explicitly initialized */
+}
+
+static void cpu_noop(device_t dev)
+{
+}
+
+static struct device_operations cpu_ops = {
+	.read_resources   = cpu_noop,
+	.set_resources    = cpu_noop,
+	.enable_resources = cpu_enable_resources,
+	.init             = cpu_init,
+	.scan_bus         = NULL,
+};
+
+static void a1x_cpu_enable_dev(device_t dev)
+{
+	dev->ops = &cpu_ops;
+}
+
+struct chip_operations cpu_allwinner_a10_ops = {
+	CHIP_NAME("CPU Allwinner A10")
+	.enable_dev = a1x_cpu_enable_dev,
+};