Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull ARM SoC platform updates from Olof Johansson:
 "SoC platform changes. Main theme this merge window:

   - The Netx platform (Netx 100/500) platform is removed by Linus
     Walleij-- the SoC doesn't have active maintainers with hardware,
     and in discussions with the vendor the agreement was that it's OK
     to remove.

   - Russell King has a series of patches that cleans up and refactors
     SA1101 and RiscPC support"

* tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (47 commits)
  ARM: stm32: use "depends on" instead of "if" after prompt
  ARM: sa1100: convert to common clock framework
  ARM: exynos: Cleanup cppcheck shifting warning
  ARM: pxa/lubbock: remove lubbock_set_misc_wr() from global view
  ARM: exynos: Only build MCPM support if used
  arm: add missing include platform-data/atmel.h
  ARM: davinci: Use GPIO lookup table for DA850 LEDs
  ARM: OMAP2: drop explicit assembler architecture
  ARM: use arch_extension directive instead of arch argument
  ARM: imx: Switch imx7d to imx-cpufreq-dt for speed-grading
  ARM: bcm: Enable PINCTRL for ARCH_BRCMSTB
  ARM: bcm: Enable ARCH_HAS_RESET_CONTROLLER for ARCH_BRCMSTB
  ARM: riscpc: enable chained scatterlist support
  ARM: riscpc: reduce IRQ handling code
  ARM: riscpc: move RiscPC assembly files from arch/arm/lib to mach-rpc
  ARM: riscpc: parse video information from tagged list
  ARM: riscpc: add ecard quirk for Atomwide 3port serial card
  MAINTAINERS: mvebu: Add git entry
  soc: ti: pm33xx: Add a print while entering RTC only mode with DDR in self-refresh
  ARM: OMAP2+: Make some variables static
  ...

1 files changed, 25 insertions, 13 deletions

diff --git a/arch/arm/mach-rpc/time.c b/arch/arm/mach-rpc/time.c
index e97f93a0af1d..1d750152b160 100644
--- a/arch/arm/mach-rpc/time.c
+++ b/arch/arm/mach-rpc/time.c
@@ -10,7 +10,7 @@
  *   04-Dec-1997	RMK	Updated for new arch/arm/time.c
  *   13=Jun-2004	DS	Moved to arch/arm/common b/c shared w/CLPS7500
  */
-#include <linux/timex.h>
+#include <linux/clocksource.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
@@ -24,11 +24,15 @@
 #define RPC_CLOCK_FREQ 2000000
 #define RPC_LATCH DIV_ROUND_CLOSEST(RPC_CLOCK_FREQ, HZ)
 
-static u32 ioc_timer_gettimeoffset(void)
+static u32 ioc_time;
+
+static u64 ioc_timer_read(struct clocksource *cs)
 {
 	unsigned int count1, count2, status;
-	long offset;
+	unsigned long flags;
+	u32 ticks;
 
+	local_irq_save(flags);
 	ioc_writeb (0, IOC_T0LATCH);
 	barrier ();
 	count1 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
@@ -38,27 +42,34 @@ static u32 ioc_timer_gettimeoffset(void)
 	ioc_writeb (0, IOC_T0LATCH);
 	barrier ();
 	count2 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
+	ticks = ioc_time + RPC_LATCH - count2;
+	local_irq_restore(flags);
 
-	offset = count2;
 	if (count2 < count1) {
 		/*
-		 * We have not had an interrupt between reading count1
-		 * and count2.
+		 * The timer has not reloaded between reading count1 and
+		 * count2, check whether an interrupt was actually pending.
 		 */
 		if (status & (1 << 5))
-			offset -= RPC_LATCH;
+			ticks += RPC_LATCH;
 	} else if (count2 > count1) {
 		/*
-		 * We have just had another interrupt between reading
-		 * count1 and count2.
+		 * The timer has reloaded, so count2 indicates the new
+		 * count since the wrap.  The interrupt would not have
+		 * been processed, so add the missed ticks.
 		 */
-		offset -= RPC_LATCH;
+		ticks += RPC_LATCH;
 	}
 
-	offset = (RPC_LATCH - offset) * (tick_nsec / 1000);
-	return DIV_ROUND_CLOSEST(offset, RPC_LATCH) * 1000;
+	return ticks;
 }
 
+static struct clocksource ioctime_clocksource = {
+	.read = ioc_timer_read,
+	.mask = CLOCKSOURCE_MASK(32),
+	.rating = 100,
+};
+
 void __init ioctime_init(void)
 {
 	ioc_writeb(RPC_LATCH & 255, IOC_T0LTCHL);
@@ -69,6 +80,7 @@ void __init ioctime_init(void)
 static irqreturn_t
 ioc_timer_interrupt(int irq, void *dev_id)
 {
+	ioc_time += RPC_LATCH;
 	timer_tick();
 	return IRQ_HANDLED;
 }
@@ -83,7 +95,7 @@ static struct irqaction ioc_timer_irq = {
  */
 void __init ioc_timer_init(void)
 {
-	arch_gettimeoffset = ioc_timer_gettimeoffset;
+	WARN_ON(clocksource_register_hz(&ioctime_clocksource, RPC_CLOCK_FREQ));
 	ioctime_init();
 	setup_irq(IRQ_TIMER0, &ioc_timer_irq);
 }