[SPARC64]: More sensible udelay implementation.

Take a page from the powerpc folks and just calculate the
delay factor directly.

Since frequency scaling chips use a system-tick register,
the value is going to be the same system-wide.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c
index 7490cc6..55db632 100644 (file)
--- a/arch/sparc64/kernel/setup.c
+++ b/arch/sparc64/kernel/setup.c
@@ -442,7 +442,6 @@ static int show_cpuinfo(struct seq_file *m, void *__unused)
                   "D$ parity tl1\t: %u\n"
                   "I$ parity tl1\t: %u\n"
 #ifndef CONFIG_SMP
-                  "Cpu0Bogo\t: %lu.%02lu\n"
                   "Cpu0ClkTck\t: %016lx\n"
 #endif
                   ,
@@ -457,8 +456,6 @@ static int show_cpuinfo(struct seq_file *m, void *__unused)
                   dcache_parity_tl1_occurred,
                   icache_parity_tl1_occurred
 #ifndef CONFIG_SMP
-                  , cpu_data(0).udelay_val/(500000/HZ),
-                  (cpu_data(0).udelay_val/(5000/HZ)) % 100,
                   cpu_data(0).clock_tick
 #endif
                );

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 9d02b3a..69a1183 100644 (file)
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -49,9 +49,6 @@ extern void calibrate_delay(void);
 
 int sparc64_multi_core __read_mostly;
 
-/* Please don't make this stuff initdata!!!  --DaveM */
-unsigned char boot_cpu_id;
-
 cpumask_t cpu_possible_map __read_mostly = CPU_MASK_NONE;
 cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE;
 cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly =
@@ -82,10 +79,7 @@ void smp_bogo(struct seq_file *m)
        
        for_each_online_cpu(i)
                seq_printf(m,
-                          "Cpu%dBogo\t: %lu.%02lu\n"
                           "Cpu%dClkTck\t: %016lx\n",
-                          i, cpu_data(i).udelay_val / (500000/HZ),
-                          (cpu_data(i).udelay_val / (5000/HZ)) % 100,
                           i, cpu_data(i).clock_tick);
 }
 
@@ -112,8 +106,6 @@ void __devinit smp_callin(void)
 
        local_irq_enable();
 
-       calibrate_delay();
-       cpu_data(cpuid).udelay_val = loops_per_jiffy;
        callin_flag = 1;
        __asm__ __volatile__("membar #Sync\n\t"
                             "flush  %%g6" : : : "memory");
@@ -1231,11 +1223,6 @@ void smp_penguin_jailcell(int irq, struct pt_regs *regs)
        preempt_enable();
 }
 
-void __init smp_tick_init(void)
-{
-       boot_cpu_id = hard_smp_processor_id();
-}
-
 /* /proc/profile writes can call this, don't __init it please. */
 int setup_profiling_timer(unsigned int multiplier)
 {
@@ -1244,7 +1231,6 @@ int setup_profiling_timer(unsigned int multiplier)
 
 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
-       cpu_data(boot_cpu_id).udelay_val = loops_per_jiffy;
 }
 
 void __devinit smp_prepare_boot_cpu(void)
@@ -1323,16 +1309,6 @@ void __cpu_die(unsigned int cpu)
 
 void __init smp_cpus_done(unsigned int max_cpus)
 {
-       unsigned long bogosum = 0;
-       int i;
-
-       for_each_online_cpu(i)
-               bogosum += cpu_data(i).udelay_val;
-       printk("Total of %ld processors activated "
-              "(%lu.%02lu BogoMIPS).\n",
-              (long) num_online_cpus(),
-              bogosum/(500000/HZ),
-              (bogosum/(5000/HZ))%100);
 }
 
 void smp_send_reschedule(int cpu)

diff --git a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c
index 51e059e..719d676 100644 (file)
--- a/arch/sparc64/kernel/sparc64_ksyms.c
+++ b/arch/sparc64/kernel/sparc64_ksyms.c
@@ -1,7 +1,6 @@
-/* $Id: sparc64_ksyms.c,v 1.121 2002/02/09 19:49:31 davem Exp $
- * arch/sparc64/kernel/sparc64_ksyms.c: Sparc64 specific ksyms support.
+/* arch/sparc64/kernel/sparc64_ksyms.c: Sparc64 specific ksyms support.
  *
- * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996, 2007 David S. Miller (davem@davemloft.net)
  * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
  * Copyright (C) 1999 Jakub Jelinek (jj@ultra.linux.cz)
  */
@@ -28,7 +27,6 @@
 #include <net/compat.h>
 
 #include <asm/oplib.h>
-#include <asm/delay.h>
 #include <asm/system.h>
 #include <asm/auxio.h>
 #include <asm/pgtable.h>
@@ -326,12 +324,6 @@ EXPORT_SYMBOL(memset);
 EXPORT_SYMBOL(memmove);
 EXPORT_SYMBOL(strncmp);
 
-/* Delay routines. */
-EXPORT_SYMBOL(__udelay);
-EXPORT_SYMBOL(__ndelay);
-EXPORT_SYMBOL(__const_udelay);
-EXPORT_SYMBOL(__delay);
-
 void VISenter(void);
 /* RAID code needs this */
 EXPORT_SYMBOL(VISenter);

diff --git a/arch/sparc64/kernel/sysfs.c b/arch/sparc64/kernel/sysfs.c
index cdb1477..52816c7 100644 (file)
--- a/arch/sparc64/kernel/sysfs.c
+++ b/arch/sparc64/kernel/sysfs.c
@@ -193,7 +193,6 @@ static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
 }
 
 SHOW_CPUDATA_ULONG_NAME(clock_tick, clock_tick);
-SHOW_CPUDATA_ULONG_NAME(udelay_val, udelay_val);
 SHOW_CPUDATA_UINT_NAME(l1_dcache_size, dcache_size);
 SHOW_CPUDATA_UINT_NAME(l1_dcache_line_size, dcache_line_size);
 SHOW_CPUDATA_UINT_NAME(l1_icache_size, icache_size);
@@ -203,7 +202,6 @@ SHOW_CPUDATA_UINT_NAME(l2_cache_line_size, ecache_line_size);
 
 static struct sysdev_attribute cpu_core_attrs[] = {
        _SYSDEV_ATTR(clock_tick,          0444, show_clock_tick, NULL),
-       _SYSDEV_ATTR(udelay_val,          0444, show_udelay_val, NULL),
        _SYSDEV_ATTR(l1_dcache_size,      0444, show_l1_dcache_size, NULL),
        _SYSDEV_ATTR(l1_dcache_line_size, 0444, show_l1_dcache_line_size, NULL),
        _SYSDEV_ATTR(l1_icache_size,      0444, show_l1_icache_size, NULL),

diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
index a31a043..62e316a 100644 (file)
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -849,9 +849,6 @@ static unsigned long sparc64_init_timers(void)
 {
        struct device_node *dp;
        unsigned long clock;
-#ifdef CONFIG_SMP
-       extern void smp_tick_init(void);
-#endif
 
        dp = of_find_node_by_path("/");
        if (tlb_type == spitfire) {
@@ -874,10 +871,6 @@ static unsigned long sparc64_init_timers(void)
                clock = of_getintprop_default(dp, "stick-frequency", 0);
        }
 
-#ifdef CONFIG_SMP
-       smp_tick_init();
-#endif
-
        return clock;
 }
 
@@ -1038,10 +1031,31 @@ static void __init setup_clockevent_multiplier(unsigned long hz)
        sparc64_clockevent.mult = mult;
 }
 
+static unsigned long tb_ticks_per_usec __read_mostly;
+
+void __delay(unsigned long loops)
+{
+       unsigned long bclock, now;
+
+       bclock = tick_ops->get_tick();
+       do {
+               now = tick_ops->get_tick();
+       } while ((now-bclock) < loops);
+}
+EXPORT_SYMBOL(__delay);
+
+void udelay(unsigned long usecs)
+{
+       __delay(tb_ticks_per_usec * usecs);
+}
+EXPORT_SYMBOL(udelay);
+
 void __init time_init(void)
 {
        unsigned long clock = sparc64_init_timers();
 
+       tb_ticks_per_usec = clock / USEC_PER_SEC;
+
        timer_ticks_per_nsec_quotient =
                clocksource_hz2mult(clock, SPARC64_NSEC_PER_CYC_SHIFT);
 

diff --git a/arch/sparc64/lib/Makefile b/arch/sparc64/lib/Makefile
index 4a725d8..c4a6d6e 100644 (file)
--- a/arch/sparc64/lib/Makefile
+++ b/arch/sparc64/lib/Makefile
@@ -14,6 +14,6 @@ lib-y := PeeCeeI.o copy_page.o clear_page.o strlen.o strncmp.o \
         NGmemcpy.o NGcopy_from_user.o NGcopy_to_user.o NGpatch.o \
         NGpage.o NGbzero.o \
         copy_in_user.o user_fixup.o memmove.o \
-        mcount.o ipcsum.o rwsem.o xor.o delay.o
+        mcount.o ipcsum.o rwsem.o xor.o
 
 obj-y += iomap.o

diff --git a/arch/sparc64/lib/delay.c b/arch/sparc64/lib/delay.c
deleted file mode 100644 (file)
index fb27e54..0000000
--- a/arch/sparc64/lib/delay.c
+++ /dev/null
@@ -1,46 +0,0 @@
-/* delay.c: Delay loops for sparc64
- *
- * Copyright (C) 2004, 2006 David S. Miller <davem@davemloft.net>
- *
- * Based heavily upon x86 variant which is:
- *     Copyright (C) 1993 Linus Torvalds
- *     Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
- */
-
-#include <linux/delay.h>
-#include <asm/timer.h>
-
-void __delay(unsigned long loops)
-{
-       unsigned long bclock, now;
-       
-       bclock = tick_ops->get_tick();
-       do {
-               now = tick_ops->get_tick();
-       } while ((now-bclock) < loops);
-}
-
-/* We used to multiply by HZ after shifting down by 32 bits
- * but that runs into problems for higher values of HZ and
- * slow cpus.
- */
-void __const_udelay(unsigned long n)
-{
-       n *= 4;
-
-       n *= (cpu_data(raw_smp_processor_id()).udelay_val * (HZ/4));
-       n >>= 32;
-
-       __delay(n + 1);
-}
-
-void __udelay(unsigned long n)
-{
-       __const_udelay(n * 0x10c7UL);
-}
-
-
-void __ndelay(unsigned long n)
-{
-       __const_udelay(n * 0x5UL);
-}

diff --git a/include/asm-sparc64/bugs.h b/include/asm-sparc64/bugs.h
index bf39d86..11ade68 100644 (file)
--- a/include/asm-sparc64/bugs.h
+++ b/include/asm-sparc64/bugs.h
@@ -4,12 +4,7 @@
  */
 #include <asm/sstate.h>
 
-extern unsigned long loops_per_jiffy;
-
 static void __init check_bugs(void)
 {
-#ifndef CONFIG_SMP
-       cpu_data(0).udelay_val = loops_per_jiffy;
-#endif
        sstate_running();
 }

diff --git a/include/asm-sparc64/cpudata.h b/include/asm-sparc64/cpudata.h
index 0016d8b..98a6e60 100644 (file)
--- a/include/asm-sparc64/cpudata.h
+++ b/include/asm-sparc64/cpudata.h
@@ -19,7 +19,7 @@ typedef struct {
        unsigned int    __softirq_pending; /* must be 1st, see rtrap.S */
        unsigned int    __pad0;
        unsigned long   clock_tick;     /* %tick's per second */
-       unsigned long   udelay_val;
+       unsigned long   __pad;
        unsigned int    __pad1;
        unsigned int    __pad2;
 

diff --git a/include/asm-sparc64/delay.h b/include/asm-sparc64/delay.h
index a4aae6f..a77aa62 100644 (file)
--- a/include/asm-sparc64/delay.h
+++ b/include/asm-sparc64/delay.h
@@ -1,37 +1,17 @@
 /* delay.h: Linux delay routines on sparc64.
  *
- * Copyright (C) 1996, 2004 David S. Miller (davem@davemloft.net).
- *
- * Based heavily upon x86 variant which is:
- * Copyright (C) 1993 Linus Torvalds
- *
- * Delay routines calling functions in arch/sparc64/lib/delay.c
+ * Copyright (C) 1996, 2004, 2007 David S. Miller (davem@davemloft.net).
  */
 
-#ifndef __SPARC64_DELAY_H
-#define __SPARC64_DELAY_H
-
-#include <linux/param.h>
-#include <asm/cpudata.h>
+#ifndef _SPARC64_DELAY_H
+#define _SPARC64_DELAY_H
 
 #ifndef __ASSEMBLY__
 
-extern void __bad_udelay(void);
-extern void __bad_ndelay(void);
-
-extern void __udelay(unsigned long usecs);
-extern void __ndelay(unsigned long nsecs);
-extern void __const_udelay(unsigned long usecs);
 extern void __delay(unsigned long loops);
-
-#define udelay(n) (__builtin_constant_p(n) ? \
-       ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
-       __udelay(n))
-       
-#define ndelay(n) (__builtin_constant_p(n) ? \
-       ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
-       __ndelay(n))
+extern void udelay(unsigned long usecs);
+#define mdelay(n)      udelay((n) * 1000)
 
 #endif /* !__ASSEMBLY__ */
 
-#endif /* defined(__SPARC64_DELAY_H) */
+#endif /* _SPARC64_DELAY_H */