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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-15 16:06:15 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-15 16:06:15 -0800 |
| commit | 66d466722c39f663b2bbeb44ba4f9419a548fa23 (patch) | |
| tree | c88df3dac15b7ef03f58a553fc42f9324d43dac0 /arch/arm/lib/delay-loop.S | |
| parent | 991688bfc63550b8c7ab9fb1de2feb44e3071d29 (diff) | |
| parent | ed141f2890cdb738fc7131367f5fb15632bc3e60 (diff) | |
Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
Pull ARM updates from Russell King:
- an update for clkdev registration error detection to simplify users
- add cpu capacity parsing from DT
- support for larger cachelines found on UniPhier caches
- documentation for udelay constants
- properly tag assembly function declarations
- remove unnecessary indirection of asm/mach-types.h
- switch to syscall table based generation to simplify future additions
of system calls, along with correpsonding commit for pkey syscalls
- remove redundant sa1101 header file
- RONX protect modules when they're in the vmalloc region
* 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
ARM: mm: allow set_memory_*() to be used on the vmalloc region
ARM: mm: fix set_memory_*() bounds checks
ARM: 8631/1: clkdev: Detect errors in clk_hw_register_clkdev() for mass registration
ARM: 8629/1: vfp: properly tag assembly function declarations in C code
ARM: 8622/3: add sysfs cpu_capacity attribute
ARM: 8621/3: parse cpu capacity-dmips-mhz from DT
ARM: 8623/1: mm: add ARM_L1_CACHE_SHIFT_7 for UniPhier outer cache
ARM: Update mach-types
ARM: sa1100: remove SA-1101 header file
ARM: 8619/1: udelay: document the various constants
ARM: wire up new pkey syscalls
ARM: convert to generated system call tables
ARM: remove indirection of asm/mach-types.h
Diffstat (limited to 'arch/arm/lib/delay-loop.S')
| -rw-r--r-- | arch/arm/lib/delay-loop.S | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/arch/arm/lib/delay-loop.S b/arch/arm/lib/delay-loop.S index 792c59d885bc..c766694e929c 100644 --- a/arch/arm/lib/delay-loop.S +++ b/arch/arm/lib/delay-loop.S @@ -17,24 +17,23 @@ .LC1: .word UDELAY_MULT /* + * loops = r0 * HZ * loops_per_jiffy / 1000000 + * * r0 <= 2000 * HZ <= 1000 */ ENTRY(__loop_udelay) ldr r2, .LC1 - mul r0, r2, r0 -ENTRY(__loop_const_udelay) @ 0 <= r0 <= 0x7fffff06 + mul r0, r2, r0 @ r0 = delay_us * UDELAY_MULT +ENTRY(__loop_const_udelay) @ 0 <= r0 <= 0xfffffaf0 ldr r2, .LC0 ldr r2, [r2] - umull r1, r0, r2, r0 - adds r1, r1, #0xffffffff - adcs r0, r0, r0 + umull r1, r0, r2, r0 @ r0-r1 = r0 * loops_per_jiffy + adds r1, r1, #0xffffffff @ rounding up ... + adcs r0, r0, r0 @ and right shift by 31 reteq lr -/* - * loops = r0 * HZ * loops_per_jiffy / 1000000 - */ .align 3 @ Delay routine |