blackfin: bf60x: add resume from hibernate

Add Bf60x resume from hibernate support

Signed-off-by: Steven Miao <realmz6@gmail.com>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Sonic Zhang <sonic.adi@gmail.com>

arch/blackfin/cpu/initcode.c

@@ -509,6 +509,11 @@ maybe_self_refresh(ADI_BOOT_DATA *bs)
 		return false;
 
 #ifdef __ADSPBF60x__
+	/* resume from hibernate, return false let ddr initialize */
+	if ((bfin_read32(DPM0_STAT) & 0xF0) == 0x50) {
+		serial_putc('b');
+		return false;
+	}
 
 #else /* __ADSPBF60x__ */
 
@@ -827,6 +832,7 @@ program_memory_controller(ADI_BOOT_DATA *bs, bool put_into_srfs)
 	while (!(bfin_read_DMC0_STAT() & DLLCALDONE))
 		continue;
 	serial_putc('!');
+
 #else /* __ADSPBF60x__ */
 
 	/* Program the external memory controller before we come out of
@@ -894,7 +900,46 @@ check_hibernation(ADI_BOOT_DATA *bs, u16 vr_ctl, bool put_into_srfs)
 		return;
 
 	serial_putc('b');
+#ifdef __ADSPBF60x__
+	if (bfin_read32(DPM0_RESTORE0) != 0) {
+		uint32_t reg = bfin_read_DMC0_CTL();
+		reg &= ~0x8;
+		bfin_write_DMC0_CTL(reg);
+
+		while ((bfin_read_DMC0_STAT() & 0x8))
+			continue;
+		while (!(bfin_read_DMC0_STAT() & 0x1))
+			continue;
 
+		serial_putc('z');
+		uint32_t *hibernate_magic = bfin_read32(DPM0_RESTORE4);
+		SSYNC(); /* make sure memory controller is done */
+		if (hibernate_magic[0] == 0xDEADBEEF) {
+			serial_putc('c');
+			SSYNC();
+			bfin_write_EVT15(hibernate_magic[1]);
+			bfin_write_IMASK(EVT_IVG15);
+			__asm__ __volatile__ (
+				/* load reti early to avoid anomaly 281 */
+				"reti = %2;"
+				/* clear hibernate magic */
+				"[%0] = %1;"
+				/* load stack pointer */
+				"SP = [%0 + 8];"
+				/* lower ourselves from reset ivg to ivg15 */
+				"raise 15;"
+				"nop;nop;nop;"
+				"rti;"
+				:
+				: "p"(hibernate_magic),
+				"d"(0x2000 /* jump.s 0 */),
+				"d"(0xffa00000)
+			);
+		}
+
+
+	}
+#else
 	/* Are we coming out of hibernate (suspend to memory) ?
 	 * The memory layout is:
 	 * 0x0: hibernate magic for anomaly 307 (0xDEADBEEF)
@@ -927,6 +972,7 @@ check_hibernation(ADI_BOOT_DATA *bs, u16 vr_ctl, bool put_into_srfs)
 		}
 		serial_putc('d');
 	}
+#endif
 
 	serial_putc('e');
 }