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From: Domen Puncer <domen.puncer@telargo.com>
To: linuxppc-embedded@ozlabs.org
Cc: u-boot-users@lists.sourceforge.net
Subject: [PATCH] icecube/lite5200b: wakeup from low-power support
Date: Thu, 15 Mar 2007 11:44:11 +0100	[thread overview]
Message-ID: <20070315104411.GF22215@moe.telargo.com> (raw)
In-Reply-To: <20070315103959.GA22215@moe.telargo.com>

U-Boot part of Lite5200b low power mode support.
Puts SDRAM out of self-refresh and transfers control to
address saved at physical 0x0.


---
 board/icecube/icecube.c |   50 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

Index: u-boot.git/board/icecube/icecube.c
===================================================================
--- u-boot.git.orig/board/icecube/icecube.c
+++ u-boot.git/board/icecube/icecube.c
@@ -42,6 +42,54 @@
 #include "mt48lc16m16a2-75.h"
 # endif
 #endif
+
+#ifdef CONFIG_LITE5200B
+/* u-boot part of low-power mode implementation */
+#define SAVED_ADDR (*(void **)0x00000000)
+#define PSC2_4 0x02
+
+void lite5200b_wakeup(void)
+{
+	unsigned char wakeup_pin;
+	void (*linux_wakeup)(void);
+
+	/* check PSC2_4, if it's down "QT" is signaling we have a wakeup
+	 * from low power mode */
+	*(vu_char *)MPC5XXX_WU_GPIO_ENABLE = PSC2_4;
+	__asm__ volatile ("sync");
+
+	wakeup_pin = *(vu_char *)MPC5XXX_WU_GPIO_DATA_I;
+	if (wakeup_pin & PSC2_4)
+		return;
+
+	/* acknowledge to "QT"
+	 * by holding pin at 1 for 10 uS */
+	*(vu_char *)MPC5XXX_WU_GPIO_DIR = PSC2_4;
+	__asm__ volatile ("sync");
+	*(vu_char *)MPC5XXX_WU_GPIO_DATA_O = PSC2_4;
+	__asm__ volatile ("sync");
+	udelay(10);
+
+	/* put ram out of self-refresh */
+	*(vu_long *)MPC5XXX_SDRAM_CTRL |= 0x80000000;	// mode_en
+	__asm__ volatile ("sync");
+	*(vu_long *)MPC5XXX_SDRAM_CTRL |= 0x50000000;	// cke ref_en
+	__asm__ volatile ("sync");
+	*(vu_long *)MPC5XXX_SDRAM_CTRL &= ~0x80000000;	// !mode_en
+	__asm__ volatile ("sync");
+	udelay(10); /* wait a bit */
+
+	/* jump back to linux kernel code */
+	linux_wakeup = SAVED_ADDR;
+	printf("\n\nLooks like we just woke, transferring control to 0x%08lx\n",
+			linux_wakeup);
+	linux_wakeup();
+}
+#else
+#define lite5200b_wakeup()
+#endif
+
+
 #ifndef CFG_RAMBOOT
 static void sdram_start (int hi_addr)
 {
@@ -208,6 +256,8 @@ long int initdram (int board_type)
 		__asm__ volatile ("sync");
 	}
 
+	lite5200b_wakeup();
+
 	return dramsize + dramsize2;
 }
 

WARNING: multiple messages have this Message-ID (diff)
From: Domen Puncer <domen.puncer@telargo.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] [PATCH] icecube/lite5200b: wakeup from low-power support
Date: Thu, 15 Mar 2007 11:44:11 +0100	[thread overview]
Message-ID: <20070315104411.GF22215@moe.telargo.com> (raw)
In-Reply-To: <20070315103959.GA22215@moe.telargo.com>

U-Boot part of Lite5200b low power mode support.
Puts SDRAM out of self-refresh and transfers control to
address saved at physical 0x0.


---
 board/icecube/icecube.c |   50 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

Index: u-boot.git/board/icecube/icecube.c
===================================================================
--- u-boot.git.orig/board/icecube/icecube.c
+++ u-boot.git/board/icecube/icecube.c
@@ -42,6 +42,54 @@
 #include "mt48lc16m16a2-75.h"
 # endif
 #endif
+
+#ifdef CONFIG_LITE5200B
+/* u-boot part of low-power mode implementation */
+#define SAVED_ADDR (*(void **)0x00000000)
+#define PSC2_4 0x02
+
+void lite5200b_wakeup(void)
+{
+	unsigned char wakeup_pin;
+	void (*linux_wakeup)(void);
+
+	/* check PSC2_4, if it's down "QT" is signaling we have a wakeup
+	 * from low power mode */
+	*(vu_char *)MPC5XXX_WU_GPIO_ENABLE = PSC2_4;
+	__asm__ volatile ("sync");
+
+	wakeup_pin = *(vu_char *)MPC5XXX_WU_GPIO_DATA_I;
+	if (wakeup_pin & PSC2_4)
+		return;
+
+	/* acknowledge to "QT"
+	 * by holding pin at 1 for 10 uS */
+	*(vu_char *)MPC5XXX_WU_GPIO_DIR = PSC2_4;
+	__asm__ volatile ("sync");
+	*(vu_char *)MPC5XXX_WU_GPIO_DATA_O = PSC2_4;
+	__asm__ volatile ("sync");
+	udelay(10);
+
+	/* put ram out of self-refresh */
+	*(vu_long *)MPC5XXX_SDRAM_CTRL |= 0x80000000;	// mode_en
+	__asm__ volatile ("sync");
+	*(vu_long *)MPC5XXX_SDRAM_CTRL |= 0x50000000;	// cke ref_en
+	__asm__ volatile ("sync");
+	*(vu_long *)MPC5XXX_SDRAM_CTRL &= ~0x80000000;	// !mode_en
+	__asm__ volatile ("sync");
+	udelay(10); /* wait a bit */
+
+	/* jump back to linux kernel code */
+	linux_wakeup = SAVED_ADDR;
+	printf("\n\nLooks like we just woke, transferring control to 0x%08lx\n",
+			linux_wakeup);
+	linux_wakeup();
+}
+#else
+#define lite5200b_wakeup()
+#endif
+
+
 #ifndef CFG_RAMBOOT
 static void sdram_start (int hi_addr)
 {
@@ -208,6 +256,8 @@ long int initdram (int board_type)
 		__asm__ volatile ("sync");
 	}
 
+	lite5200b_wakeup();
+
 	return dramsize + dramsize2;
 }
 

  parent reply	other threads:[~2007-03-15 10:44 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-15 10:39 [PATCH 0/5 v2] MPC5200 and Lite5200b low power modes Domen Puncer
2007-03-15 10:41 ` [PATCH 1/5] mpc52xx suspend: UART Domen Puncer
2007-03-15 10:41 ` [PATCH 2/5] mpc52xx suspend: FEC (ethernet) Domen Puncer
2007-03-15 13:35   ` Grant Likely
2007-03-15 10:42 ` [PATCH 3/5] mpc52xx suspend: USB Domen Puncer
2007-03-15 13:24   ` Grant Likely
2007-03-15 14:37     ` Wrong board info for ML403 Leonid
2007-03-16  8:15       ` Andrei Konovalov
2007-03-22  7:44     ` [PATCH 3/5 v2] mpc52xx suspend: USB Domen Puncer
2007-03-23 11:56       ` Sylvain Munaut
2007-03-23 16:00         ` Grant Likely
2007-03-15 10:43 ` [PATCH 4/5] mpc52xx suspend: deep-sleep Domen Puncer
2007-03-23 15:58   ` Grant Likely
2007-04-04  7:37     ` Domen Puncer
2007-04-16  5:40       ` Grant Likely
2007-04-17  7:05         ` Domen Puncer
2007-04-17  7:10           ` Grant Likely
2007-03-15 10:44 ` Domen Puncer [this message]
2007-03-15 10:44   ` [U-Boot-Users] [PATCH] icecube/lite5200b: wakeup from low-power support Domen Puncer
2007-03-26 16:08   ` Grant Likely
2007-03-26 16:08     ` [U-Boot-Users] " Grant Likely
2007-04-03  8:46     ` Domen Puncer
2007-04-03  8:46       ` [U-Boot-Users] " Domen Puncer
2007-04-16  4:45       ` Grant Likely
2007-04-16  4:45         ` [U-Boot-Users] " Grant Likely
2007-04-16  6:25         ` Domen Puncer
2007-04-16  6:25           ` [U-Boot-Users] " Domen Puncer
2007-04-16  7:10           ` Wolfgang Denk
2007-04-16 12:04         ` Stefan Roese
2007-04-16 13:08           ` Domen Puncer
2007-04-16 13:36             ` Grant Likely
2007-04-20 12:13             ` Stefan Roese
2007-04-20 13:47               ` Wolfgang Denk
2007-04-17 11:29           ` Stefan Roese
2007-04-17 14:50             ` Wolfgang Denk
2007-04-18  5:55               ` [U-Boot-Users] [PATCH] icecube/lite5200b: document " Domen Puncer
2007-03-31 17:20   ` [PATCH] icecube/lite5200b: " Rafal Jaworowski
2007-03-31 17:20     ` [U-Boot-Users] " Rafal Jaworowski
2007-03-31 18:38     ` Domen Puncer
2007-03-31 18:38       ` Domen Puncer
2007-03-15 10:44 ` [PATCH 5/5] lite5200b suspend: low-power mode Domen Puncer
2007-03-15 14:09   ` Grant Likely
2007-03-15 16:36     ` Domen Puncer
2007-03-22  7:41       ` Domen Puncer
2007-03-26 13:23         ` Domen Puncer
2007-03-26 15:54           ` Grant Likely
2007-04-17  7:11     ` Domen Puncer
2007-04-17  7:25       ` Grant Likely

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