[ARM] 4187/1: iop: unify time implementation across iop32x, iop33x, and iop13xx

* architecture specific details are handled in asm/arch/time.h
* ARCH_IOP13XX now selects PLAT_IOP
* as suggested by Lennert use ifdef CONFIG_XSCALE to skip the cp_wait on
XSC3

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 35 insertions, 26 deletions

diff --git a/arch/arm/plat-iop/Makefile b/arch/arm/plat-iop/Makefile
index 3250d732a171..4d2b1da3cd82 100644
--- a/arch/arm/plat-iop/Makefile
+++ b/arch/arm/plat-iop/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_ARCH_IOP33X) += cp6.o
 
 # IOP13XX
 obj-$(CONFIG_ARCH_IOP13XX) += cp6.o
+obj-$(CONFIG_ARCH_IOP13XX) += time.o
 
 obj-m                  :=
 obj-n                  :=
diff --git a/arch/arm/plat-iop/time.c b/arch/arm/plat-iop/time.c
index 0d53b813cbb4..16300adfb4de 100644
--- a/arch/arm/plat-iop/time.c
+++ b/arch/arm/plat-iop/time.c
@@ -24,37 +24,45 @@
 #include <asm/uaccess.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/time.h>
-
-#ifdef CONFIG_ARCH_IOP32X
-#define IRQ_IOP3XX_TIMER0	IRQ_IOP32X_TIMER0
-#else
-#ifdef CONFIG_ARCH_IOP33X
-#define IRQ_IOP3XX_TIMER0	IRQ_IOP33X_TIMER0
-#endif
-#endif
+#include <asm/arch/time.h>
 
 static unsigned long ticks_per_jiffy;
 static unsigned long ticks_per_usec;
 static unsigned long next_jiffy_time;
 
-unsigned long iop3xx_gettimeoffset(void)
+unsigned long iop_gettimeoffset(void)
 {
-	unsigned long offset;
+	unsigned long offset, temp1, temp2;
+
+	/* enable cp6, if necessary, to avoid taking the overhead of an
+	 * undefined instruction trap
+	 */
+	asm volatile (
+	"mrc	p15, 0, %0, c15, c1, 0\n\t"
+	"ands	%1, %0, #(1 << 6)\n\t"
+	"orreq	%0, %0, #(1 << 6)\n\t"
+	"mcreq	p15, 0, %0, c15, c1, 0\n\t"
+#ifdef CONFIG_XSCALE
+	"mrceq	p15, 0, %0, c15, c1, 0\n\t"
+	"moveq	%0, %0\n\t"
+	"subeq	pc, pc, #4\n\t"
+#endif
+	: "=r"(temp1), "=r"(temp2) : : "cc");
 
-	offset = next_jiffy_time - *IOP3XX_TU_TCR1;
+	offset = next_jiffy_time - read_tcr1();
 
 	return offset / ticks_per_usec;
 }
 
 static irqreturn_t
-iop3xx_timer_interrupt(int irq, void *dev_id)
+iop_timer_interrupt(int irq, void *dev_id)
 {
 	write_seqlock(&xtime_lock);
 
-	asm volatile("mcr p6, 0, %0, c6, c1, 0" : : "r" (1));
+	write_tisr(1);
 
-	while ((signed long)(next_jiffy_time - *IOP3XX_TU_TCR1)
-							>= ticks_per_jiffy) {
+	while ((signed long)(next_jiffy_time - read_tcr1())
+		>= ticks_per_jiffy) {
 		timer_tick();
 		next_jiffy_time -= ticks_per_jiffy;
 	}
@@ -64,13 +72,13 @@ iop3xx_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction iop3xx_timer_irq = {
-	.name		= "IOP3XX Timer Tick",
-	.handler	= iop3xx_timer_interrupt,
+static struct irqaction iop_timer_irq = {
+	.name		= "IOP Timer Tick",
+	.handler	= iop_timer_interrupt,
 	.flags		= IRQF_DISABLED | IRQF_TIMER,
 };
 
-void __init iop3xx_init_time(unsigned long tick_rate)
+void __init iop_init_time(unsigned long tick_rate)
 {
 	u32 timer_ctl;
 
@@ -78,17 +86,17 @@ void __init iop3xx_init_time(unsigned long tick_rate)
 	ticks_per_usec = tick_rate / 1000000;
 	next_jiffy_time = 0xffffffff;
 
-	timer_ctl = IOP3XX_TMR_EN | IOP3XX_TMR_PRIVILEGED |
-			IOP3XX_TMR_RELOAD | IOP3XX_TMR_RATIO_1_1;
+	timer_ctl = IOP_TMR_EN | IOP_TMR_PRIVILEGED |
+			IOP_TMR_RELOAD | IOP_TMR_RATIO_1_1;
 
 	/*
 	 * We use timer 0 for our timer interrupt, and timer 1 as
 	 * monotonic counter for tracking missed jiffies.
 	 */
-	asm volatile("mcr p6, 0, %0, c4, c1, 0" : : "r" (ticks_per_jiffy - 1));
-	asm volatile("mcr p6, 0, %0, c0, c1, 0" : : "r" (timer_ctl));
-	asm volatile("mcr p6, 0, %0, c5, c1, 0" : : "r" (0xffffffff));
-	asm volatile("mcr p6, 0, %0, c1, c1, 0" : : "r" (timer_ctl));
+	write_trr0(ticks_per_jiffy - 1);
+	write_tmr0(timer_ctl);
+	write_trr1(0xffffffff);
+	write_tmr1(timer_ctl);
 
-	setup_irq(IRQ_IOP3XX_TIMER0, &iop3xx_timer_irq);
+	setup_irq(IRQ_IOP_TIMER0, &iop_timer_irq);
 }