summaryrefslogtreecommitdiffstats
path: root/arch/mips/jz4740/setup.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/jz4740/setup.c')
-rw-r--r--arch/mips/jz4740/setup.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c
index 6a9e14d..d97cfbf 100644
--- a/arch/mips/jz4740/setup.c
+++ b/arch/mips/jz4740/setup.c
@@ -1,5 +1,6 @@
/*
* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
+ * Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>
* JZ4740 setup code
*
* This program is free software; you can redistribute it and/or modify it
@@ -14,13 +15,44 @@
*/
#include <linux/init.h>
+#include <linux/io.h>
#include <linux/kernel.h>
+#include <asm/bootinfo.h>
+
+#include <asm/mach-jz4740/base.h>
+
#include "reset.h"
+
+#define JZ4740_EMC_SDRAM_CTRL 0x80
+
+
+static void __init jz4740_detect_mem(void)
+{
+ void __iomem *jz_emc_base;
+ u32 ctrl, bus, bank, rows, cols;
+ phys_t size;
+
+ jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
+ ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
+ bus = 2 - ((ctrl >> 31) & 1);
+ bank = 1 + ((ctrl >> 19) & 1);
+ cols = 8 + ((ctrl >> 26) & 7);
+ rows = 11 + ((ctrl >> 20) & 3);
+ printk(KERN_DEBUG
+ "SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
+ bus, bank, rows, cols);
+ iounmap(jz_emc_base);
+
+ size = 1 << (bus + bank + cols + rows);
+ add_memory_region(0, size, BOOT_MEM_RAM);
+}
+
void __init plat_mem_setup(void)
{
jz4740_reset_init();
+ jz4740_detect_mem();
}
const char *get_system_type(void)
OpenPOWER on IntegriCloud