X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=board%2Ficecube%2Ficecube.c;h=296099843421a0e489e47ffd843b75840b4d07fe;hb=7187db73491c8de0fb56efb5e5134ba5ec443089;hp=700c9d9323f3fb1bec9ad29b7515ae81829c1b37;hpb=e0b369e4f71b11dd5716903dd6258028cf07e6e8;p=u-boot

diff --git a/board/icecube/icecube.c b/board/icecube/icecube.c
index 700c9d9323..2960998434 100644
--- a/board/icecube/icecube.c
+++ b/board/icecube/icecube.c
@@ -42,6 +42,53 @@
 #include "mt48lc16m16a2-75.h"
 # endif
 #endif
+
+#ifdef CONFIG_LITE5200B_PM
+/* 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 +255,8 @@ long int initdram (int board_type)
 		__asm__ volatile ("sync");
 	}
 
+	lite5200b_wakeup();
+
 	return dramsize + dramsize2;
 }