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-rw-r--r--arch/powerpc/kernel/misc_64.S70
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index b3e95ff0dba0..ae1433da09b2 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -604,6 +604,76 @@ _GLOBAL(real_writeb)
604#endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) */ 604#endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) */
605 605
606/* 606/*
607 * SCOM access functions for 970 (FX only for now)
608 *
609 * unsigned long scom970_read(unsigned int address);
610 * void scom970_write(unsigned int address, unsigned long value);
611 *
612 * The address passed in is the 24 bits register address. This code
613 * is 970 specific and will not check the status bits, so you should
614 * know what you are doing.
615 */
616_GLOBAL(scom970_read)
617 /* interrupts off */
618 mfmsr r4
619 ori r0,r4,MSR_EE
620 xori r0,r0,MSR_EE
621 mtmsrd r0,1
622
623 /* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits
624 * (including parity). On current CPUs they must be 0'd,
625 * and finally or in RW bit
626 */
627 rlwinm r3,r3,8,0,15
628 ori r3,r3,0x8000
629
630 /* do the actual scom read */
631 sync
632 mtspr SPRN_SCOMC,r3
633 isync
634 mfspr r3,SPRN_SCOMD
635 isync
636 mfspr r0,SPRN_SCOMC
637 isync
638
639 /* XXX: fixup result on some buggy 970's (ouch ! we lost a bit, bah
640 * that's the best we can do). Not implemented yet as we don't use
641 * the scom on any of the bogus CPUs yet, but may have to be done
642 * ultimately
643 */
644
645 /* restore interrupts */
646 mtmsrd r4,1
647 blr
648
649
650_GLOBAL(scom970_write)
651 /* interrupts off */
652 mfmsr r5
653 ori r0,r5,MSR_EE
654 xori r0,r0,MSR_EE
655 mtmsrd r0,1
656
657 /* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits
658 * (including parity). On current CPUs they must be 0'd.
659 */
660
661 rlwinm r3,r3,8,0,15
662
663 sync
664 mtspr SPRN_SCOMD,r4 /* write data */
665 isync
666 mtspr SPRN_SCOMC,r3 /* write command */
667 isync
668 mfspr 3,SPRN_SCOMC
669 isync
670
671 /* restore interrupts */
672 mtmsrd r5,1
673 blr
674
675
676/*
607 * Create a kernel thread 677 * Create a kernel thread
608 * kernel_thread(fn, arg, flags) 678 * kernel_thread(fn, arg, flags)
609 */ 679 */