[U-Boot] [PATCH 11/11] Blackfin: bf60x: add resume from hibernate

Sonic Zhang
2013-02-07T07:47:38Z

From: Steven Miao <realmz6@gmail.com>

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>
---
arch/blackfin/cpu/initcode.c | 44 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/arch/blackfin/cpu/initcode.c b/arch/blackfin/cpu/initcode.c
index 5ee2203..1d293cc 100644
--- a/arch/blackfin/cpu/initcode.c
+++ b/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__ */

@@ -823,6 +828,7 @@ 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
@@ -890,7 +896,44 @@ 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)
@@ -922,6 +965,7 @@ check_hibernation(ADI_BOOT_DATA *bs, u16 vr_ctl, bool put_into_srfs)
}
serial_putc('d');
}
+#endif

serial_putc('e');
}
--
1.7.0.4