mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-24 17:24:05 +02:00
f2a91858ac
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11201 3c298f89-4303-0410-b956-a3cf2f4a3e73
120 lines
3.8 KiB
Diff
120 lines
3.8 KiB
Diff
From 7d6656dc127b54e53e507e8f264bb7e14e620cad Mon Sep 17 00:00:00 2001
|
|
From: Axel Gembe <ago@bastart.eu.org>
|
|
Date: Sat, 17 May 2008 15:02:39 +0200
|
|
Subject: [PATCH] bcm963xx: add new timer code
|
|
|
|
This basically selects the new generic MIPS timer code for BCM963xx and
|
|
simplifies the timer setup code.
|
|
|
|
Signed-off-by: Axel Gembe <ago@bastart.eu.org>
|
|
---
|
|
arch/mips/Kconfig | 2 +
|
|
arch/mips/bcm963xx/time.c | 64 ++++++++++++++++++++------------------------
|
|
2 files changed, 31 insertions(+), 35 deletions(-)
|
|
|
|
Index: linux-2.6.25.4/arch/mips/Kconfig
|
|
===================================================================
|
|
--- linux-2.6.25.4.orig/arch/mips/Kconfig
|
|
+++ linux-2.6.25.4/arch/mips/Kconfig
|
|
@@ -67,6 +67,8 @@ config BCM963XX
|
|
select HW_HAS_PCI
|
|
select DMA_NONCOHERENT
|
|
select IRQ_CPU
|
|
+ select CEVT_R4K
|
|
+ select CSRC_R4K
|
|
help
|
|
This is a fmaily of boards based on the Broadcom MIPS32
|
|
|
|
Index: linux-2.6.25.4/arch/mips/bcm963xx/time.c
|
|
===================================================================
|
|
--- linux-2.6.25.4.orig/arch/mips/bcm963xx/time.c
|
|
+++ linux-2.6.25.4/arch/mips/bcm963xx/time.c
|
|
@@ -1,6 +1,7 @@
|
|
/*
|
|
<:copyright-gpl
|
|
Copyright 2004 Broadcom Corp. All Rights Reserved.
|
|
+ Copyright (C) 2008 Axel Gembe <ago@bastart.eu.org>
|
|
|
|
This program is free software; you can distribute it and/or modify it
|
|
under the terms of the GNU General Public License (Version 2) as
|
|
@@ -40,50 +41,43 @@
|
|
#include <bcm_map_part.h>
|
|
#include <bcm_intr.h>
|
|
|
|
-static unsigned long r4k_offset; /* Amount to increment compare reg each time */
|
|
-static unsigned long r4k_cur; /* What counter should be at next timer irq */
|
|
-
|
|
-/* *********************************************************************
|
|
- * calculateCpuSpeed()
|
|
- * Calculate the BCM6348 CPU speed by reading the PLL strap register
|
|
- * and applying the following formula:
|
|
- * cpu_clk = (.25 * 64MHz freq) * (N1 + 1) * (N2 + 2) / (M1_CPU + 1)
|
|
- * Input parameters:
|
|
- * none
|
|
- * Return value:
|
|
- * none
|
|
- ********************************************************************* */
|
|
-
|
|
+/*
|
|
+ * calculateCpuSpeed()
|
|
+ *
|
|
+ * Calculate the BCM6348 CPU speed by reading the PLL strap register and applying
|
|
+ * the following formula:
|
|
+ *
|
|
+ * cpu_clk = (.25 * 64MHz freq) * (N1 + 1) * (N2 + 2) / (M1_CPU + 1)
|
|
+ */
|
|
static inline unsigned long __init calculateCpuSpeed(void)
|
|
{
|
|
- u32 pllStrap = PERF->PllStrap;
|
|
- int n1 = (pllStrap & PLL_N1_MASK) >> PLL_N1_SHFT;
|
|
- int n2 = (pllStrap & PLL_N2_MASK) >> PLL_N2_SHFT;
|
|
- int m1cpu = (pllStrap & PLL_M1_CPU_MASK) >> PLL_M1_CPU_SHFT;
|
|
+ u32 pllStrap;
|
|
+ int n1, n2, m1cpu;
|
|
+
|
|
+ pllStrap = PERF->PllStrap;
|
|
+ n1 = (pllStrap & PLL_N1_MASK) >> PLL_N1_SHFT;
|
|
+ n2 = (pllStrap & PLL_N2_MASK) >> PLL_N2_SHFT;
|
|
+ m1cpu = (pllStrap & PLL_M1_CPU_MASK) >> PLL_M1_CPU_SHFT;
|
|
|
|
return (16 * (n1 + 1) * (n2 + 2) / (m1cpu + 1)) * 1000000;
|
|
}
|
|
|
|
|
|
-static inline unsigned long __init cal_r4koff(void)
|
|
-{
|
|
- mips_hpt_frequency = calculateCpuSpeed() / 2;
|
|
- return (mips_hpt_frequency / HZ);
|
|
-}
|
|
-
|
|
void __init plat_time_init(void)
|
|
{
|
|
- unsigned int est_freq, flags;
|
|
- local_irq_save(flags);
|
|
+ unsigned long cpu_clock;
|
|
+
|
|
+ cpu_clock = calculateCpuSpeed();
|
|
+
|
|
+ printk("CPU frequency %lu.%02lu MHz\n", cpu_clock / 1000000,
|
|
+ (cpu_clock % 1000000) * 100 / 1000000);
|
|
+
|
|
+ mips_hpt_frequency = cpu_clock / 2;
|
|
|
|
- printk("calculating r4koff... ");
|
|
- r4k_offset = cal_r4koff();
|
|
- printk("%08lx(%d)\n", r4k_offset, (int)r4k_offset);
|
|
-
|
|
- est_freq = 2 * r4k_offset * HZ;
|
|
- est_freq += 5000; /* round */
|
|
- est_freq -= est_freq % 10000;
|
|
- printk("CPU frequency %d.%02d MHz\n", est_freq / 1000000,
|
|
- (est_freq % 1000000) * 100 / 1000000);
|
|
- local_irq_restore(flags);
|
|
+ /*
|
|
+ * Use deterministic values for initial counter interrupt
|
|
+ * so that calibrate delay avoids encountering a counter wrap.
|
|
+ */
|
|
+ write_c0_count(0);
|
|
+ write_c0_compare(0xffff);
|
|
}
|