MIPS: Alchemy: get rid of allow_au1k_wait
Eliminate the 'allow_au1k_wait' variable. MIPS kernel installs the
Alchemy-specific wait code before timer initialization; if the C0
timer must be used for timekeeping the wait function is set to NULL
which means no wait implementation is available.
As a sideeffect, the 'wait instruction available' output in
/proc/cpuinfo now correctly indicates whether 'wait' is usable.
Run-tested on DB1200.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/alchemy/common/time.c b/arch/mips/alchemy/common/time.c
index 33fbae7..f34ff86 100644
--- a/arch/mips/alchemy/common/time.c
+++ b/arch/mips/alchemy/common/time.c
@@ -36,14 +36,13 @@
#include <linux/interrupt.h>
#include <linux/spinlock.h>
+#include <asm/processor.h>
#include <asm/time.h>
#include <asm/mach-au1x00/au1000.h>
/* 32kHz clock enabled and detected */
#define CNTR_OK (SYS_CNTRL_E0 | SYS_CNTRL_32S)
-extern int allow_au1k_wait; /* default off for CP0 Counter */
-
static cycle_t au1x_counter1_read(struct clocksource *cs)
{
return au_readl(SYS_RTCREAD);
@@ -153,13 +152,17 @@
printk(KERN_INFO "Alchemy clocksource installed\n");
- /* can now use 'wait' */
- allow_au1k_wait = 1;
return;
cntr_err:
- /* counters unusable, use C0 counter */
+ /*
+ * MIPS kernel assigns 'au1k_wait' to 'cpu_wait' before this
+ * function is called. Because the Alchemy counters are unusable
+ * the C0 timekeeping code is installed and use of the 'wait'
+ * instruction must be prohibited, which is done most easily by
+ * assigning NULL to cpu_wait.
+ */
+ cpu_wait = NULL;
r4k_clockevent_init();
init_r4k_clocksource();
- allow_au1k_wait = 0;
}