linux-kernel - [PATCH 1/18] ARM: OMAP2: Place SMS and SDRC into smart idle mode

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Date:	Mon,  9 Apr 2007 17:30:44 -0400
From:	Tony Lindgren <tony@...mide.com>
To:	linux-kernel@...r.kernel.org
Cc:	Juha Yrjola <juha.yrjola@...idboot.com>,
	Tony Lindgren <tony@...mide.com>
Subject: [PATCH 1/18] ARM: OMAP2: Place SMS and SDRC into smart idle mode

From: Juha Yrjola <juha.yrjola@...idboot.com>

Place SMS and SDRC into smart idle mode

Signed-off-by: Juha Yrjola <juha.yrjola@...idboot.com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 arch/arm/mach-omap2/io.c     |    2 +
 arch/arm/mach-omap2/memory.c |   48 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 0 deletions(-)

Index: linux-2.6/arch/arm/mach-omap2/io.c
===================================================================
--- linux-2.6.orig/arch/arm/mach-omap2/io.c	2007-04-09 15:12:08.000000000 -0400
+++ linux-2.6/arch/arm/mach-omap2/io.c	2007-04-09 15:26:32.000000000 -0400
@@ -26,6 +26,7 @@
 extern void omap_sram_init(void);
 extern int omap2_clk_init(void);
 extern void omap2_check_revision(void);
+extern void omap2_init_memory(void);
 extern void gpmc_init(void);
 extern void omapfb_reserve_sdram(void);
 
@@ -80,5 +81,6 @@ void __init omap2_init_common_hw(void)
 {
 	omap2_mux_init();
 	omap2_clk_init();
+	omap2_init_memory();
 	gpmc_init();
 }
Index: linux-2.6/arch/arm/mach-omap2/memory.c
===================================================================
--- linux-2.6.orig/arch/arm/mach-omap2/memory.c	2007-04-06 09:00:28.000000000 -0400
+++ linux-2.6/arch/arm/mach-omap2/memory.c	2007-04-09 15:26:32.000000000 -0400
@@ -30,6 +30,38 @@
 #include "prcm-regs.h"
 #include "memory.h"
 
+#define SMS_BASE		0x68008000
+#define SMS_SYSCONFIG		0x010
+
+#define SDRC_BASE		0x68009000
+#define SDRC_SYSCONFIG		0x010
+#define SDRC_SYSSTATUS		0x014
+
+static const u32 sms_base = IO_ADDRESS(SMS_BASE);
+static const u32 sdrc_base = IO_ADDRESS(SDRC_BASE);
+
+
+static inline void sms_write_reg(int idx, u32 val)
+{
+	__raw_writel(val, sms_base + idx);
+}
+
+static inline u32 sms_read_reg(int idx)
+{
+	return __raw_readl(sms_base + idx);
+}
+
+static inline void sdrc_write_reg(int idx, u32 val)
+{
+	__raw_writel(val, sdrc_base + idx);
+}
+
+static inline u32 sdrc_read_reg(int idx)
+{
+	return __raw_readl(sdrc_base + idx);
+}
+
+
 static struct memory_timings mem_timings;
 
 u32 omap2_memory_get_slow_dll_ctrl(void)
@@ -99,3 +131,19 @@ void omap2_init_memory_params(u32 force_
 	/* 90 degree phase for anything below 133Mhz + disable DLL filter */
 	mem_timings.slow_dll_ctrl |= ((1 << 1) | (3 << 8));
 }
+
+void __init omap2_init_memory(void)
+{
+	u32 l;
+
+	l = sms_read_reg(SMS_SYSCONFIG);
+	l &= ~(0x3 << 3);
+	l |= (0x2 << 3);
+	sms_write_reg(SMS_SYSCONFIG, l);
+
+	l = sdrc_read_reg(SDRC_SYSCONFIG);
+	l &= ~(0x3 << 3);
+	l |= (0x2 << 3);
+	sdrc_write_reg(SDRC_SYSCONFIG, l);
+
+}
-
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