Convert OMAPs 32kHz clocksource implementation to use the generic MMIO

clocksource support.  This achieves several things:

1. It means we get rid of all these helper functions which frankly should
   never have been necessary.
2. It means omap_readl() inside these helper functions does not appear in
   ftrace output.

Another plus is that we avoid the overhead of calculating the address to
read each time, but a minus is that we use readl() which has a barrier.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[tony@atomide.com: updated to use ioremap]
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 34 insertions, 87 deletions

diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
index c13bc3d3eb2c..a6cbb712da51 100644
--- a/arch/arm/plat-omap/counter_32k.c
+++ b/arch/arm/plat-omap/counter_32k.c
@@ -18,6 +18,7 @@
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/sched.h>
+#include <linux/clocksource.h>
 
 #include <asm/sched_clock.h>
 
@@ -26,87 +27,16 @@
 
 #include <plat/clock.h>
 
-
 /*
  * 32KHz clocksource ... always available, on pretty most chips except
  * OMAP 730 and 1510.  Other timers could be used as clocksources, with
  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
  * but systems won't necessarily want to spend resources that way.
  */
+static void __iomem *timer_32k_base;
 
 #define OMAP16XX_TIMER_32K_SYNCHRONIZED         0xfffbc410
 
-#include <linux/clocksource.h>
-
-/*
- * offset_32k holds the init time counter value. It is then subtracted
- * from every counter read to achieve a counter that counts time from the
- * kernel boot (needed for sched_clock()).
- */
-static u32 offset_32k __read_mostly;
-
-#ifdef CONFIG_ARCH_OMAP16XX
-static cycle_t notrace omap16xx_32k_read(struct clocksource *cs)
-{
-        return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED) - offset_32k;
-}
-#else
-#define omap16xx_32k_read       NULL
-#endif
-
-#ifdef CONFIG_SOC_OMAP2420
-static cycle_t notrace omap2420_32k_read(struct clocksource *cs)
-{
-        return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10) - offset_32k;
-}
-#else
-#define omap2420_32k_read       NULL
-#endif
-
-#ifdef CONFIG_SOC_OMAP2430
-static cycle_t notrace omap2430_32k_read(struct clocksource *cs)
-{
-        return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10) - offset_32k;
-}
-#else
-#define omap2430_32k_read       NULL
-#endif
-
-#ifdef CONFIG_ARCH_OMAP3
-static cycle_t notrace omap34xx_32k_read(struct clocksource *cs)
-{
-        return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10) - offset_32k;
-}
-#else
-#define omap34xx_32k_read       NULL
-#endif
-
-#ifdef CONFIG_ARCH_OMAP4
-static cycle_t notrace omap44xx_32k_read(struct clocksource *cs)
-{
-        return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10) - offset_32k;
-}
-#else
-#define omap44xx_32k_read       NULL
-#endif
-
-/*
- * Kernel assumes that sched_clock can be called early but may not have
- * things ready yet.
- */
-static cycle_t notrace omap_32k_read_dummy(struct clocksource *cs)
-{
-        return 0;
-}
-
-static struct clocksource clocksource_32k = {
-        .name           = "32k_counter",
-        .rating         = 250,
-        .read           = omap_32k_read_dummy,
-        .mask           = CLOCKSOURCE_MASK(32),
-        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
 /*
  * Returns current time from boot in nsecs. It's OK for this to wrap
  * around for now, as it's just a relative time stamp.
@@ -122,7 +52,7 @@ static DEFINE_CLOCK_DATA(cd);
 
 static inline unsigned long long notrace _omap_32k_sched_clock(void)
 {
-        u32 cyc = clocksource_32k.read(&clocksource_32k);
+        u32 cyc = timer_32k_base ? __raw_readl(timer_32k_base) : 0;
         return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT);
 }
 
@@ -140,7 +70,7 @@ unsigned long long notrace omap_32k_sched_clock(void)
 
 static void notrace omap_update_sched_clock(void)
 {
-        u32 cyc = clocksource_32k.read(&clocksource_32k);
+        u32 cyc = timer_32k_base ? __raw_readl(timer_32k_base) : 0;
         update_sched_clock(&cd, cyc, (u32)~0);
 }
 
@@ -153,6 +83,7 @@ static void notrace omap_update_sched_clock(void)
  */
 static struct timespec persistent_ts;
 static cycles_t cycles, last_cycles;
+static unsigned int persistent_mult, persistent_shift;
 void read_persistent_clock(struct timespec *ts)
 {
         unsigned long long nsecs;
@@ -160,11 +91,10 @@ void read_persistent_clock(struct timespec *ts)
         struct timespec *tsp = &persistent_ts;
 
         last_cycles = cycles;
-        cycles = clocksource_32k.read(&clocksource_32k);
+        cycles = timer_32k_base ? __raw_readl(timer_32k_base) : 0;
         delta = cycles - last_cycles;
 
-        nsecs = clocksource_cyc2ns(delta,
-                                   clocksource_32k.mult, clocksource_32k.shift);
+        nsecs = clocksource_cyc2ns(delta, persistent_mult, persistent_shift);
 
         timespec_add_ns(tsp, nsecs);
         *ts = *tsp;
@@ -176,29 +106,46 @@ int __init omap_init_clocksource_32k(void)
                         "%s: can't register clocksource!\n";
 
         if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
+                u32 pbase;
+                unsigned long size = SZ_4K;
+                void __iomem *base;
                 struct clk *sync_32k_ick;
 
-                if (cpu_is_omap16xx())
-                        clocksource_32k.read = omap16xx_32k_read;
-                else if (cpu_is_omap2420())
-                        clocksource_32k.read = omap2420_32k_read;
+                if (cpu_is_omap16xx()) {
+                        pbase = OMAP16XX_TIMER_32K_SYNCHRONIZED;
+                        size = SZ_1K;
+                } else if (cpu_is_omap2420())
+                        pbase = OMAP2420_32KSYNCT_BASE + 0x10;
                 else if (cpu_is_omap2430())
-                        clocksource_32k.read = omap2430_32k_read;
+                        pbase = OMAP2430_32KSYNCT_BASE + 0x10;
                 else if (cpu_is_omap34xx())
-                        clocksource_32k.read = omap34xx_32k_read;
+                        pbase = OMAP3430_32KSYNCT_BASE + 0x10;
                 else if (cpu_is_omap44xx())
-                        clocksource_32k.read = omap44xx_32k_read;
+                        pbase = OMAP4430_32KSYNCT_BASE + 0x10;
                 else
                         return -ENODEV;
 
+                /* For this to work we must have a static mapping in io.c for this area */
+                base = ioremap(pbase, size);
+                if (!base)
+                        return -ENODEV;
+
                 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
                 if (!IS_ERR(sync_32k_ick))
                         clk_enable(sync_32k_ick);
 
-                offset_32k = clocksource_32k.read(&clocksource_32k);
+                timer_32k_base = base;
+
+                /*
+                 * 120000 rough estimate from the calculations in
+                 * __clocksource_updatefreq_scale.
+                 */
+                clocks_calc_mult_shift(&persistent_mult, &persistent_shift,
+                                32768, NSEC_PER_SEC, 120000);
 
-                if (clocksource_register_hz(&clocksource_32k, 32768))
-                        printk(err, clocksource_32k.name);
+                if (clocksource_mmio_init(base, "32k_counter", 32768, 250, 32,
+                                          clocksource_mmio_readl_up))
+                        printk(err, "32k_counter");
 
                 init_fixed_sched_clock(&cd, omap_update_sched_clock, 32,
                                        32768, SC_MULT, SC_SHIFT);