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;
}
next prev parent reply other threads:[~2007-03-15 10:44 UTC|newest]
Thread overview: 32+ 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]
2007-03-26 16:08 ` [PATCH] icecube/lite5200b: wakeup from low-power support Grant Likely
2007-04-03 8:46 ` Domen Puncer
2007-04-16 4:45 ` Grant Likely
2007-04-16 6:25 ` Domen Puncer
2007-03-31 17:20 ` Rafal Jaworowski
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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