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linux/arch/arm/lib/delay.S

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
* linux/arch/arm/lib/delay.S
*
* Copyright (C) 1995, 1996 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
#include <asm/param.h>
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
.text
[ARM] 3152/1: make various assembly local labels actually local (the rest) Patch from Nicolas Pitre For assembly labels to actually be local they must start with ".L" and not only "." otherwise they still remain visible in the final link and clutter kallsyms needlessly, and possibly make for unclear symbolic backtrace. This patch simply inserts a"L" where appropriate. The code itself is unchanged. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-12 05:51:49 +08:00
.LC0: .word loops_per_jiffy
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
.LC1: .word (2199023*HZ)>>11
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
* r0 <= 2000
* lpj <= 0x01ffffff (max. 3355 bogomips)
* HZ <= 1000
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
*/
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
ENTRY(__udelay)
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
ldr r2, .LC1
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
mul r0, r2, r0
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
ENTRY(__const_udelay) @ 0 <= r0 <= 0x7fffff06
ARM: udelay: prevent math rounding resulting in short udelays We perform the microseconds to loops calculation using a number of multiplies and shift rights. Each shift right rounds down the resulting value, which can result in delays shorter than requested. Ensure that we always round up. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-01-11 07:55:59 +08:00
mov r1, #-1
[ARM] 3152/1: make various assembly local labels actually local (the rest) Patch from Nicolas Pitre For assembly labels to actually be local they must start with ".L" and not only "." otherwise they still remain visible in the final link and clutter kallsyms needlessly, and possibly make for unclear symbolic backtrace. This patch simply inserts a"L" where appropriate. The code itself is unchanged. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-12 05:51:49 +08:00
ldr r2, .LC0
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
ldr r2, [r2] @ max = 0x01ffffff
ARM: udelay: prevent math rounding resulting in short udelays We perform the microseconds to loops calculation using a number of multiplies and shift rights. Each shift right rounds down the resulting value, which can result in delays shorter than requested. Ensure that we always round up. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-01-11 07:55:59 +08:00
add r0, r0, r1, lsr #32-14
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
mov r0, r0, lsr #14 @ max = 0x0001ffff
ARM: udelay: prevent math rounding resulting in short udelays We perform the microseconds to loops calculation using a number of multiplies and shift rights. Each shift right rounds down the resulting value, which can result in delays shorter than requested. Ensure that we always round up. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-01-11 07:55:59 +08:00
add r2, r2, r1, lsr #32-10
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
mov r2, r2, lsr #10 @ max = 0x00007fff
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
mul r0, r2, r0 @ max = 2^32-1
ARM: udelay: prevent math rounding resulting in short udelays We perform the microseconds to loops calculation using a number of multiplies and shift rights. Each shift right rounds down the resulting value, which can result in delays shorter than requested. Ensure that we always round up. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-01-11 07:55:59 +08:00
add r0, r0, r1, lsr #32-6
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
movs r0, r0, lsr #6
[ARM] Remove RETINSTR macro RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-25 18:17:23 +08:00
moveq pc, lr
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
[ARM] 3346/1: Fix udelay() for HZ values different from 100 Patch from Peter Teichmann Currently, if the kernels HZ value is greater than 100, delays with the udelay function are too short. This can cause trouble for instance with the zd1201 usb wlan driver. This patch suggests a solution that keeps the overhead small and maintains (hopefully) sufficient resolution. Signed-off-by: Peter Teichmann Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-21 01:10:09 +08:00
* loops = r0 * HZ * loops_per_jiffy / 1000000
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
*
* Oh, if only we had a cycle counter...
*/
@ Delay routine
ENTRY(__delay)
subs r0, r0, #1
#if 0
[ARM] Remove RETINSTR macro RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-25 18:17:23 +08:00
movls pc, lr
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
subs r0, r0, #1
[ARM] Remove RETINSTR macro RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-25 18:17:23 +08:00
movls pc, lr
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
subs r0, r0, #1
[ARM] Remove RETINSTR macro RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-25 18:17:23 +08:00
movls pc, lr
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
subs r0, r0, #1
[ARM] Remove RETINSTR macro RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-25 18:17:23 +08:00
movls pc, lr
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
subs r0, r0, #1
[ARM] Remove RETINSTR macro RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-25 18:17:23 +08:00
movls pc, lr
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
subs r0, r0, #1
[ARM] Remove RETINSTR macro RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-25 18:17:23 +08:00
movls pc, lr
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
subs r0, r0, #1
[ARM] Remove RETINSTR macro RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-25 18:17:23 +08:00
movls pc, lr
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
subs r0, r0, #1
#endif
bhi __delay
[ARM] Remove RETINSTR macro RETINSTR is a left-over from the days when we had 26-bit and 32-bit CPU support integrated into the same tree. Since this is no longer the case, we can now remove RETINSTR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-25 18:17:23 +08:00
mov pc, lr
[ARM] 5227/1: Add the ENDPROC declarations to the .S files This declaration specifies the "function" type and size for various assembly functions, mainly needed for generating the correct branch instructions in Thumb-2. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-08-28 18:22:32 +08:00
ENDPROC(__udelay)
ENDPROC(__const_udelay)
ENDPROC(__delay)