[Blackfin] arch: Support for CPU_FREQ and NOHZ

Singed-off-by: Vitja Makarov <vitja.makarov@gmail.com>

3 files changed, 26 insertions, 12 deletions

diff --git a/arch/blackfin/kernel/time-ts.c b/arch/blackfin/kernel/time-ts.c
index 4482c47c09e5..e887efc86c29 100644
--- a/arch/blackfin/kernel/time-ts.c
+++ b/arch/blackfin/kernel/time-ts.c
@@ -60,7 +60,7 @@ static inline unsigned long long cycles_2_ns(cycle_t cyc)
 
 static cycle_t read_cycles(void)
 {
-        return get_cycles();
+        return __bfin_cycles_off + (get_cycles() << __bfin_cycles_mod);
 }
 
 unsigned long long sched_clock(void)
@@ -117,7 +117,7 @@ static void bfin_timer_set_mode(enum clock_event_mode mode,
                 break;
         }
         case CLOCK_EVT_MODE_ONESHOT:
-                bfin_write_TSCALE(0);
+                bfin_write_TSCALE(TIME_SCALE - 1);
                 bfin_write_TCOUNT(0);
                 bfin_write_TCNTL(TMPWR | TMREN);
                 CSYNC();
@@ -183,10 +183,14 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
 
 static int __init bfin_clockevent_init(void)
 {
+        unsigned long timer_clk;
+
+        timer_clk = get_cclk() / TIME_SCALE;
+
         setup_irq(IRQ_CORETMR, &bfin_timer_irq);
         bfin_timer_init();
 
-        clockevent_bfin.mult = div_sc(get_cclk(), NSEC_PER_SEC, clockevent_bfin.shift);
+        clockevent_bfin.mult = div_sc(timer_clk, NSEC_PER_SEC, clockevent_bfin.shift);
         clockevent_bfin.max_delta_ns = clockevent_delta2ns(-1, &clockevent_bfin);
         clockevent_bfin.min_delta_ns = clockevent_delta2ns(100, &clockevent_bfin);
         clockevents_register_device(&clockevent_bfin);
diff --git a/arch/blackfin/mach-common/cpufreq.c b/arch/blackfin/mach-common/cpufreq.c
index dd1515e4094c..75cdad291e88 100644
--- a/arch/blackfin/mach-common/cpufreq.c
+++ b/arch/blackfin/mach-common/cpufreq.c
@@ -62,6 +62,14 @@ static struct bfin_dpm_state {
         unsigned int tscale; /* change the divider on the core timer interrupt */
 } dpm_state_table[3];
 
+/*
+   normalized to maximum frequncy offset for CYCLES,
+   used in time-ts cycles clock source, but could be used
+   somewhere also.
+ */
+unsigned long long __bfin_cycles_off;
+unsigned int __bfin_cycles_mod;
+
 /**************************************************************************/
 
 static unsigned int bfin_getfreq(unsigned int cpu)
@@ -80,6 +88,7 @@ static int bfin_target(struct cpufreq_policy *policy,
         unsigned int index, plldiv, tscale;
         unsigned long flags, cclk_hz;
         struct cpufreq_freqs freqs;
+        cycles_t cycles;
 
         if (cpufreq_frequency_table_target(policy, bfin_freq_table,
                  target_freq, relation, &index))
@@ -101,8 +110,14 @@ static int bfin_target(struct cpufreq_policy *policy,
                 bfin_write_PLL_DIV(plldiv);
                 /* we have to adjust the core timer, because it is using cclk */
                 bfin_write_TSCALE(tscale);
+                cycles = get_cycles();
                 SSYNC();
+        cycles += 10; /* ~10 cycles we loose after get_cycles() */
+        __bfin_cycles_off += (cycles << __bfin_cycles_mod) - (cycles << index);
+        __bfin_cycles_mod = index;
         local_irq_restore(flags);
+        /* TODO: just test case for cycles clock source, remove later */
+        pr_debug("cpufreq: done\n");
         cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 
         return 0;
@@ -119,15 +134,6 @@ static int __init __bfin_cpu_init(struct cpufreq_policy *policy)
         unsigned long cclk, sclk, csel, min_cclk;
         int index;
 
-#ifdef CONFIG_CYCLES_CLOCKSOURCE
-/*
- * Clocksource CYCLES is still CONTINUOUS but not longer with a constant tick rate in case we enable
- * CPU frequency scaling, since CYCLES runs off Core Clock.
- */
-        printk(KERN_WARNING "CPU frequency scaling not supported: Clocksource not suitable\n"
-                return -ENODEV;
-#endif
-
         if (policy->cpu != 0)
                 return -EINVAL;
 
diff --git a/include/asm-blackfin/time.h b/include/asm-blackfin/time.h
index 6e5859b6ea32..ddc43ce38533 100644
--- a/include/asm-blackfin/time.h
+++ b/include/asm-blackfin/time.h
@@ -24,6 +24,8 @@
 
 #ifndef CONFIG_CPU_FREQ
 #define TIME_SCALE 1
+#define __bfin_cycles_off (0)
+#define __bfin_cycles_mod (0)
 #else
 /*
  * Blackfin CPU frequency scaling supports max Core Clock 1, 1/2 and 1/4 .
@@ -31,6 +33,8 @@
  * adjust the Core Timer Presale Register. This way we don't lose time.
  */
 #define TIME_SCALE 4
+extern unsigned long long __bfin_cycles_off;
+extern unsigned int __bfin_cycles_mod;
 #endif
 
 #endif