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 file changed, 44 insertions(+)
diff --git a/arch/blackfin/cpu/initcode.c b/arch/blackfin/cpu/initcode.c index 6740e34..3fd6d84 100644 --- a/arch/blackfin/cpu/initcode.c +++ b/arch/blackfin/cpu/initcode.c @@ -504,6 +504,11 @@ 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__ */
@@ -818,6 +823,7 @@ 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 @@ -885,7 +891,44 @@ 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) @@ -917,6 +960,7 @@ check_hibernation(ADI_BOOT_DATA *bs, u16 vr_ctl, bool put_into_srfs) } serial_putc('d'); } +#endif
serial_putc('e'); }