1 files changed, 99 insertions, 0 deletions
diff --git a/post/board/lwmon5/gdc.c b/post/board/lwmon5/gdc.c
new file mode 100644
index 0000000..4af6a7a
--- /dev/null
+++ b/post/board/lwmon5/gdc.c
@@ -0,0 +1,99 @@
+/*
+ * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
+ *
+ * Developed for DENX Software Engineering GmbH
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+
+#ifdef CONFIG_POST
+
+/* This test attempts to verify board GDC. A scratch register tested, then
+ * simple memory test (get_ram_size()) run over GDC memory.
+ */
+
+#include <post.h>
+
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define GDC_SCRATCH_REG 0xC1FF8044
+#define GDC_VERSION_REG 0xC1FF8084
+#define GDC_RAM_START   0xC0000000
+#define GDC_RAM_END     0xC2000000
+
+#if CONFIG_POST & CFG_POST_BSPEC4
+
+static int gdc_test_reg_one(uint value)
+{
+	int ret;
+	uint read_value;
+
+	/* write test pattern */
+	out_be32((void *)GDC_SCRATCH_REG, value);
+	/* read other location (protect against data lines capacity) */
+	ret = in_be32((void *)GDC_RAM_START);
+	/* verify test pattern */
+	read_value = in_be32((void *)GDC_SCRATCH_REG);
+	if (read_value != value) {
+		post_log("GDC SCRATCH test failed write %08X, read %08X\n",
+			value, read_value);
+	}
+
+	return (read_value != value);
+}
+
+/* Verify GDC, get memory size */
+int gdc_post_test(int flags)
+{
+	uint   old_value;
+	int    ret = 0;
+
+	post_log("\n");
+	old_value = in_be32((void *)GDC_SCRATCH_REG);
+
+	/*
+	 * GPIOC2 register behaviour: the LIME graphics processor has a
+	 * maximum of 5 GPIO ports that can be used in this hardware
+	 * configuration. Thus only the  bits  for these 5 GPIOs can be
+	 * activated in the GPIOC2 register. All other bits will always be
+	 * read as zero.
+	 */
+	if (gdc_test_reg_one(0x00150015))
+		ret = 1;
+	if (gdc_test_reg_one(0x000A000A))
+		ret = 1;
+
+	out_be32((void *)GDC_SCRATCH_REG, old_value);
+
+	old_value = in_be32((void *)GDC_VERSION_REG);
+	post_log("GDC chip version %u.%u, year %04X\n",
+		(old_value >> 8) & 0xFF, old_value & 0xFF,
+		(old_value >> 16) & 0xFFFF);
+
+	old_value = get_ram_size((void *)GDC_RAM_START,
+				 GDC_RAM_END - GDC_RAM_START);
+	post_log("GDC RAM size: %d bytes\n", old_value);
+
+	return ret;
+}
+#endif /* CONFIG_POST & CFG_POST_BSPEC4 */
+#endif /* CONFIG_POST */