[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>

7 files changed, 24 insertions, 93 deletions

diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c
index 7490cc670a53..55db632999fc 100644
--- 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 9d02b3a9bb85..69a1183c622d 100644
--- 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 51e059e36d47..719d676c2ddc 100644
--- 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 cdb1477af89f..52816c7be0b9 100644
--- 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 a31a0439244f..62e316ab1339 100644
--- 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 4a725d8985f1..c4a6d6e7d03c 100644
--- 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
index fb27e54a03ee..000000000000
--- 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);
-}