linux-kernel - [PATCH] MIPS: JZ4740: setup: Autodetect physical memory.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Mon,  2 May 2011 11:47:00 +0200
From:	Maarten ter Huurne <maarten@...ewalker.org>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	Lars-Peter Clausen <lars@...afoo.de>,
	Maarten ter Huurne <maarten@...ewalker.org>
Subject: [PATCH] MIPS: JZ4740: setup: Autodetect physical memory.

Assume that the boot loader knows the physical memory of the system and
deduce that information from the contents of the SDRAM control register.
It is still possible to override with with the "mem=" parameter, but we
have a sensible default now.

Signed-off-by: Maarten ter Huurne <maarten@...ewalker.org>
Acked-by: Lars-Peter Clausen <lars@...afoo.de>
---
 arch/mips/jz4740/setup.c |   32 ++++++++++++++++++++++++++++++++
 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@...afoo.de>
+ *  Copyright (C) 2011, Maarten ter Huurne <maarten@...ewalker.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)
-- 
1.7.3.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/