adm5120: add 3.18 support

[openwrt/svn-archive/archive.git] / target / linux / adm5120 / files-3.18 / arch / mips / adm5120 / common / memory.c

diff --git a/target/linux/adm5120/files-3.18/arch/mips/adm5120/common/memory.c b/target/linux/adm5120/files-3.18/arch/mips/adm5120/common/memory.c
new file mode 100644 (file)
index 0000000..d07266f
--- /dev/null
+++ b/target/linux/adm5120/files-3.18/arch/mips/adm5120/common/memory.c
@@ -0,0 +1,149 @@
+/*
+ *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+#include <asm/bootinfo.h>
+#include <asm/addrspace.h>
+
+#include <asm/mach-adm5120/adm5120_info.h>
+#include <asm/mach-adm5120/adm5120_defs.h>
+#include <asm/mach-adm5120/adm5120_switch.h>
+#include <asm/mach-adm5120/adm5120_mpmc.h>
+
+#ifdef DEBUG
+#  define mem_dbg(f, a...)     printk(KERN_INFO "mem_detect: " f, ## a)
+#else
+#  define mem_dbg(f, a...)
+#endif
+
+unsigned long adm5120_memsize;
+
+#define MEM_READL(a)           __raw_readl((void __iomem *)(a))
+#define MEM_WRITEL(a, v)       __raw_writel((v), (void __iomem *)(a))
+
+static int __init mem_check_pattern(u8 *addr, unsigned long offs)
+{
+       u32 *p1 = (u32 *)addr;
+       u32 *p2 = (u32 *)(addr+offs);
+       u32 t, u, v;
+
+       /* save original value */
+       t = MEM_READL(p1);
+
+       u = MEM_READL(p2);
+       if (t != u)
+               return 0;
+
+       v = 0x55555555;
+       if (u == v)
+               v = 0xAAAAAAAA;
+
+       mem_dbg("write 0x%08X to 0x%08lX\n", v, (unsigned long)p1);
+
+       MEM_WRITEL(p1, v);
+       adm5120_ndelay(1000);
+       u = MEM_READL(p2);
+
+       mem_dbg("pattern at 0x%08lX is 0x%08X\n", (unsigned long)p2, u);
+
+       /* restore original value */
+       MEM_WRITEL(p1, t);
+
+       return (v == u);
+}
+
+static void __init adm5120_detect_memsize(void)
+{
+       u32     memctrl;
+       u32     size, maxsize;
+       u8      *p;
+
+       memctrl = SW_READ_REG(SWITCH_REG_MEMCTRL);
+       switch (memctrl & MEMCTRL_SDRS_MASK) {
+       case MEMCTRL_SDRS_4M:
+               maxsize = 4 << 20;
+               break;
+       case MEMCTRL_SDRS_8M:
+               maxsize = 8 << 20;
+               break;
+       case MEMCTRL_SDRS_16M:
+               maxsize = 16 << 20;
+               break;
+       default:
+               maxsize = 64 << 20;
+               break;
+       }
+
+       mem_dbg("checking for %uMB chip in 1st bank\n", maxsize >> 20);
+
+       /* detect size of the 1st SDRAM bank */
+       p = (u8 *)KSEG1ADDR(0);
+       for (size = 2<<20; size <= (maxsize >> 1); size <<= 1) {
+               if (mem_check_pattern(p, size)) {
+                       /* mirrored address */
+                       mem_dbg("mirrored data found at offset 0x%08X\n", size);
+                       break;
+               }
+       }
+
+       mem_dbg("chip size in 1st bank is %uMB\n", size >> 20);
+       adm5120_memsize = size;
+
+       if (size != maxsize)
+               /* 2nd bank is not supported */
+               goto out;
+
+       if ((memctrl & MEMCTRL_SDR1_ENABLE) == 0)
+               /* 2nd bank is disabled */
+               goto out;
+
+       /*
+        * some bootloaders enable 2nd bank, even if the 2nd SDRAM chip
+        * are missing.
+        */
+       mem_dbg("check presence of 2nd bank\n");
+
+       p = (u8 *)KSEG1ADDR(maxsize+size-4);
+       if (mem_check_pattern(p, 0))
+               adm5120_memsize += size;
+
+       if (maxsize != size) {
+               /* adjusting MECTRL register */
+               memctrl &= ~(MEMCTRL_SDRS_MASK);
+               switch (size>>20) {
+               case 4:
+                       memctrl |= MEMCTRL_SDRS_4M;
+                       break;
+               case 8:
+                       memctrl |= MEMCTRL_SDRS_8M;
+                       break;
+               case 16:
+                       memctrl |= MEMCTRL_SDRS_16M;
+                       break;
+               default:
+                       memctrl |= MEMCTRL_SDRS_64M;
+                       break;
+               }
+               SW_WRITE_REG(SWITCH_REG_MEMCTRL, memctrl);
+       }
+
+out:
+       mem_dbg("%dx%uMB memory found\n", (adm5120_memsize == size) ? 1 : 2 ,
+               size>>20);
+}
+
+void __init adm5120_mem_init(void)
+{
+       adm5120_detect_memsize();
+       add_memory_region(0, adm5120_memsize, BOOT_MEM_RAM);
+}