Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arm / cpu / armv7 / zynq / ddrc.c

diff --git a/qemu/roms/u-boot/arch/arm/cpu/armv7/zynq/ddrc.c b/qemu/roms/u-boot/arch/arm/cpu/armv7/zynq/ddrc.c
new file mode 100644 (file)
index 0000000..ba6a6ae
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arm/cpu/armv7/zynq/ddrc.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2012 - 2013 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2012 - 2013 Xilinx, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/arch/hardware.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Control regsiter bitfield definitions */
+#define ZYNQ_DDRC_CTRLREG_BUSWIDTH_MASK                0xC
+#define ZYNQ_DDRC_CTRLREG_BUSWIDTH_SHIFT       2
+#define ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT       1
+
+/* ECC scrub regsiter definitions */
+#define ZYNQ_DDRC_ECC_SCRUBREG_ECC_MODE_MASK   0x7
+#define ZYNQ_DDRC_ECC_SCRUBREG_ECCMODE_SECDED  0x4
+
+void zynq_ddrc_init(void)
+{
+       u32 width, ecctype;
+
+       width = readl(&ddrc_base->ddrc_ctrl);
+       width = (width & ZYNQ_DDRC_CTRLREG_BUSWIDTH_MASK) >>
+                                       ZYNQ_DDRC_CTRLREG_BUSWIDTH_SHIFT;
+       ecctype = (readl(&ddrc_base->ecc_scrub) &
+               ZYNQ_DDRC_ECC_SCRUBREG_ECC_MODE_MASK);
+
+       /* ECC is enabled when memory is in 16bit mode and it is enabled */
+       if ((ecctype == ZYNQ_DDRC_ECC_SCRUBREG_ECCMODE_SECDED) &&
+           (width == ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT)) {
+               puts("Memory: ECC enabled\n");
+               /*
+                * Clear the first 1MB because it is not initialized from
+                * first stage bootloader. To get ECC to work all memory has
+                * been initialized by writing any value.
+                */
+               memset(0, 0, 1 * 1024 * 1024);
+       } else {
+               puts("Memory: ECC disabled\n");
+       }
+
+       if (width == ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT)
+               gd->ram_size /= 2;
+}