Merge branch 'disintegrate-asm-generic' of git://git.infradead.org/users/dhowells/linux-headers into asm-generic

Patches from David Howells <dhowells@redhat.com>:

This is to complete part of the UAPI disintegration for which the
preparatory patches were pulled recently.

Note that there are some fixup patches which are at the base of the
branch aimed at you, plus all arches get the asm-generic branch merged in too.

* 'disintegrate-asm-generic' of git://git.infradead.org/users/dhowells/linux-headers:
  UAPI: (Scripted) Disintegrate include/asm-generic
  UAPI: Fix conditional header installation handling (notably kvm_para.h on m68k)
  c6x: remove c6x signal.h
  UAPI: Split compound conditionals containing __KERNEL__ in Arm64
  UAPI: Fix the guards on various asm/unistd.h files

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 90 insertions, 43 deletions

diff --git a/arch/arm/mach-ks8695/time.c b/arch/arm/mach-ks8695/time.c
index ec783a3070ae..46c84bc7792c 100644
--- a/arch/arm/mach-ks8695/time.c
+++ b/arch/arm/mach-ks8695/time.c
@@ -25,53 +25,98 @@
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/io.h>
+#include <linux/clockchips.h>
 
 #include <asm/mach/time.h>
 #include <asm/system_misc.h>
 
-#include <mach/regs-timer.h>
 #include <mach/regs-irq.h>
 
 #include "generic.h"
 
+#define KS8695_TMR_OFFSET	(0xF0000 + 0xE400)
+#define KS8695_TMR_VA		(KS8695_IO_VA + KS8695_TMR_OFFSET)
+#define KS8695_TMR_PA		(KS8695_IO_PA + KS8695_TMR_OFFSET)
+
 /*
- * Returns number of ms since last clock interrupt.  Note that interrupts
- * will have been disabled by do_gettimeoffset()
+ * Timer registers
  */
-static unsigned long ks8695_gettimeoffset (void)
+#define KS8695_TMCON		(0x00)		/* Timer Control Register */
+#define KS8695_T1TC		(0x04)		/* Timer 1 Timeout Count Register */
+#define KS8695_T0TC		(0x08)		/* Timer 0 Timeout Count Register */
+#define KS8695_T1PD		(0x0C)		/* Timer 1 Pulse Count Register */
+#define KS8695_T0PD		(0x10)		/* Timer 0 Pulse Count Register */
+
+/* Timer Control Register */
+#define TMCON_T1EN		(1 << 1)	/* Timer 1 Enable */
+#define TMCON_T0EN		(1 << 0)	/* Timer 0 Enable */
+
+/* Timer0 Timeout Counter Register */
+#define T0TC_WATCHDOG		(0xff)		/* Enable watchdog mode */
+
+static void ks8695_set_mode(enum clock_event_mode mode,
+			    struct clock_event_device *evt)
 {
-	unsigned long elapsed, tick2, intpending;
+	u32 tmcon;
 
-	/*
-	 * Get the current number of ticks.  Note that there is a race
-	 * condition between us reading the timer and checking for an
-	 * interrupt.  We solve this by ensuring that the counter has not
-	 * reloaded between our two reads.
-	 */
-	elapsed = __raw_readl(KS8695_TMR_VA + KS8695_T1TC) + __raw_readl(KS8695_TMR_VA + KS8695_T1PD);
-	do {
-		tick2 = elapsed;
-		intpending = __raw_readl(KS8695_IRQ_VA + KS8695_INTST) & (1 << KS8695_IRQ_TIMER1);
-		elapsed = __raw_readl(KS8695_TMR_VA + KS8695_T1TC) + __raw_readl(KS8695_TMR_VA + KS8695_T1PD);
-	} while (elapsed > tick2);
-
-	/* Convert to number of ticks expired (not remaining) */
-	elapsed = (CLOCK_TICK_RATE / HZ) - elapsed;
-
-	/* Is interrupt pending?  If so, then timer has been reloaded already. */
-	if (intpending)
-		elapsed += (CLOCK_TICK_RATE / HZ);
-
-	/* Convert ticks to usecs */
-	return (unsigned long)(elapsed * (tick_nsec / 1000)) / LATCH;
+	if (mode == CLOCK_EVT_FEAT_PERIODIC) {
+		u32 rate = DIV_ROUND_CLOSEST(KS8695_CLOCK_RATE, HZ);
+		u32 half = DIV_ROUND_CLOSEST(rate, 2);
+
+		/* Disable timer 1 */
+		tmcon = readl_relaxed(KS8695_TMR_VA + KS8695_TMCON);
+		tmcon &= ~TMCON_T1EN;
+		writel_relaxed(tmcon, KS8695_TMR_VA + KS8695_TMCON);
+
+		/* Both registers need to count down */
+		writel_relaxed(half, KS8695_TMR_VA + KS8695_T1TC);
+		writel_relaxed(half, KS8695_TMR_VA + KS8695_T1PD);
+
+		/* Re-enable timer1 */
+		tmcon |= TMCON_T1EN;
+		writel_relaxed(tmcon, KS8695_TMR_VA + KS8695_TMCON);
+	}
 }
 
+static int ks8695_set_next_event(unsigned long cycles,
+				 struct clock_event_device *evt)
+
+{
+	u32 half = DIV_ROUND_CLOSEST(cycles, 2);
+	u32 tmcon;
+
+	/* Disable timer 1 */
+	tmcon = readl_relaxed(KS8695_TMR_VA + KS8695_TMCON);
+	tmcon &= ~TMCON_T1EN;
+	writel_relaxed(tmcon, KS8695_TMR_VA + KS8695_TMCON);
+
+	/* Both registers need to count down */
+	writel_relaxed(half, KS8695_TMR_VA + KS8695_T1TC);
+	writel_relaxed(half, KS8695_TMR_VA + KS8695_T1PD);
+
+	/* Re-enable timer1 */
+	tmcon |= TMCON_T1EN;
+	writel_relaxed(tmcon, KS8695_TMR_VA + KS8695_TMCON);
+
+	return 0;
+}
+
+static struct clock_event_device clockevent_ks8695 = {
+	.name		= "ks8695_t1tc",
+	.rating		= 300, /* Reasonably fast and accurate clock event */
+	.features	= CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,
+	.set_next_event	= ks8695_set_next_event,
+	.set_mode	= ks8695_set_mode,
+};
+
 /*
  * IRQ handler for the timer.
  */
 static irqreturn_t ks8695_timer_interrupt(int irq, void *dev_id)
 {
-	timer_tick();
+	struct clock_event_device *evt = &clockevent_ks8695;
+
+	evt->event_handler(evt);
 	return IRQ_HANDLED;
 }
 
@@ -83,18 +128,22 @@ static struct irqaction ks8695_timer_irq = {
 
 static void ks8695_timer_setup(void)
 {
-	unsigned long tmout = CLOCK_TICK_RATE / HZ;
 	unsigned long tmcon;
 
-	/* disable timer1 */
-	tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
-	__raw_writel(tmcon & ~TMCON_T1EN, KS8695_TMR_VA + KS8695_TMCON);
-
-	__raw_writel(tmout / 2, KS8695_TMR_VA + KS8695_T1TC);
-	__raw_writel(tmout / 2, KS8695_TMR_VA + KS8695_T1PD);
+	/* Disable timer 0 and 1 */
+	tmcon = readl_relaxed(KS8695_TMR_VA + KS8695_TMCON);
+	tmcon &= ~TMCON_T0EN;
+	tmcon &= ~TMCON_T1EN;
+	writel_relaxed(tmcon, KS8695_TMR_VA + KS8695_TMCON);
 
-	/* re-enable timer1 */
-	__raw_writel(tmcon | TMCON_T1EN, KS8695_TMR_VA + KS8695_TMCON);
+	/*
+	 * Use timer 1 to fire IRQs on the timeline, minimum 2 cycles
+	 * (one on each counter) maximum 2*2^32, but the API will only
+	 * accept up to a 32bit full word (0xFFFFFFFFU).
+	 */
+	clockevents_config_and_register(&clockevent_ks8695,
+					KS8695_CLOCK_RATE, 2,
+					0xFFFFFFFFU);
 }
 
 static void __init ks8695_timer_init (void)
@@ -107,8 +156,6 @@ static void __init ks8695_timer_init (void)
 
 struct sys_timer ks8695_timer = {
 	.init		= ks8695_timer_init,
-	.offset		= ks8695_gettimeoffset,
-	.resume		= ks8695_timer_setup,
 };
 
 void ks8695_restart(char mode, const char *cmd)
@@ -119,12 +166,12 @@ void ks8695_restart(char mode, const char *cmd)
 		soft_restart(0);
 
 	/* disable timer0 */
-	reg = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
-	__raw_writel(reg & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
+	reg = readl_relaxed(KS8695_TMR_VA + KS8695_TMCON);
+	writel_relaxed(reg & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
 
 	/* enable watchdog mode */
-	__raw_writel((10 << 8) | T0TC_WATCHDOG, KS8695_TMR_VA + KS8695_T0TC);
+	writel_relaxed((10 << 8) | T0TC_WATCHDOG, KS8695_TMR_VA + KS8695_T0TC);
 
 	/* re-enable timer0 */
-	__raw_writel(reg | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
+	writel_relaxed(reg | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
 }