[u-boot patch] support lite5200b wakeup in u-boot

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From: Domen Puncer <domen.puncer@telargo•com>
To: linuxppc-embedded@ozlabs•org
Subject: [u-boot patch] support lite5200b wakeup in u-boot
Date: Thu, 1 Mar 2007 08:59:19 +0100	[thread overview]
Message-ID: <20070301075919.GG17184@moe.telargo.com> (raw)
In-Reply-To: <20070301075323.GP4397@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


Signed-off-by: Domen Puncer <domen.puncer@telargo•com>

diff --git a/board/icecube/icecube.c b/board/icecube/icecube.c
index 9b222da..4b35776 100644
--- a/board/icecube/icecube.c
+++ b/board/icecube/icecube.c
@@ -42,6 +42,54 @@ # else
 #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 = 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 @@ #endif /* CFG_RAMBOOT */
 		__asm__ volatile ("sync");
 	}
 
+	lite5200b_wakeup();
+
 	return dramsize + dramsize2;
 }
 
diff --git a/include/mpc5xxx.h b/include/mpc5xxx.h
index 1d20d1d..c7eb090 100644
--- a/include/mpc5xxx.h
+++ b/include/mpc5xxx.h
@@ -189,6 +189,7 @@ #define MPC5XXX_WU_GPIO_ENABLE  (MPC5XXX
 #define MPC5XXX_WU_GPIO_ODE     (MPC5XXX_WU_GPIO + 0x0004)
 #define MPC5XXX_WU_GPIO_DIR     (MPC5XXX_WU_GPIO + 0x0008)
 #define MPC5XXX_WU_GPIO_DATA    (MPC5XXX_WU_GPIO + 0x000c)
+#define MPC5XXX_WU_GPIO_DATA_I  (MPC5XXX_WU_GPIO + 0x0020)
 
 /* PCI registers */
 #define MPC5XXX_PCI_CMD		(MPC5XXX_PCI + 0x04)

next prev parent reply	other threads:[~2007-03-01  7:59 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-01  7:53 [PATCH 0/7] MPC5200 and Lite5200b low power modes Domen Puncer
2007-03-01  7:54 ` [PATCH 1/7] mpc52xx suspend: bestcomm Domen Puncer
2007-03-01  7:55 ` [PATCH 2/7] mpc52xx suspend: UART Domen Puncer
2007-03-01  7:55 ` [PATCH 3/7] mpc52xx suspend: FEC (ethernet) Domen Puncer
2007-03-01  7:56 ` [PATCH 4/7] mpc52xx suspend: USB Domen Puncer
2007-03-01  7:56 ` [PATCH 5/7] mpc52xx suspend: deep-sleep Domen Puncer
2007-03-01  7:57 ` [PATCH 6/7] lite5200b suspend: PIC Domen Puncer
2007-03-01  7:59 ` Domen Puncer [this message]
2007-03-01  8:49   ` [u-boot patch] support lite5200b wakeup in u-boot Stefan Roese
2007-03-01  8:00 ` [PATCH 7/7] lite5200b suspend: low-power mode Domen Puncer
2007-03-02 18:57   ` Scott Wood
2007-03-03  7:15     ` Domen Puncer
2007-03-01 14:25 ` [PATCH 0/7] MPC5200 and Lite5200b low power modes Grant Likely
2007-03-01 14:51   ` New Bestcomm/FEC patches (was: Re: [PATCH 0/7] MPC5200 and Lite5200b low power modes) Bartlomiej Sieka
2007-03-02  7:31     ` Domen Puncer
2007-03-02 21:35 ` [PATCH 0/7] MPC5200 and Lite5200b low power modes Sylvain Munaut
2007-03-03  7:33   ` Domen Puncer
2007-03-03 19:58     ` Endianness versus too many byte swaps?? Charles Krinke
2007-03-05 10:53     ` [PATCH 0/7] MPC5200 and Lite5200b low power modes Domen Puncer
2007-03-05 10:58       ` Sylvain Munaut
2007-03-05 20:21         ` Domen Puncer

find likely ancestor, descendant, or conflicting patches for this message:
( dfblob:9b222da dfblob:4b35776 dfblob:1d20d1d dfblob:c7eb090 )
 OR (
bs:"[u-boot patch] support lite5200b wakeup in u-boot" )
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