cns3xxx: add experimental 3.18 support

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43406 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 104 insertions, 0 deletions

diff --git a/target/linux/cns3xxx/patches-3.18/090-timers.patch b/target/linux/cns3xxx/patches-3.18/090-timers.patch
new file mode 100644
index 0000000000..2bddc1f67b
--- /dev/null
+++ b/target/linux/cns3xxx/patches-3.18/090-timers.patch
@@ -0,0 +1,104 @@
+--- a/arch/arm/mach-cns3xxx/core.c
++++ b/arch/arm/mach-cns3xxx/core.c
+@@ -135,12 +135,13 @@ static void cns3xxx_timer_set_mode(enum 
+ 
+ 	switch (mode) {
+ 	case CLOCK_EVT_MODE_PERIODIC:
+-		reload = pclk * 20 / (3 * HZ) * 0x25000;
++		reload = pclk * 1000000 / HZ;
+ 		writel(reload, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
+ 		ctrl |= (1 << 0) | (1 << 2) | (1 << 9);
+ 		break;
+ 	case CLOCK_EVT_MODE_ONESHOT:
+ 		/* period set, and timer enabled in 'next_event' hook */
++		writel(0, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
+ 		ctrl |= (1 << 2) | (1 << 9);
+ 		break;
+ 	case CLOCK_EVT_MODE_UNUSED:
+@@ -168,7 +169,7 @@ static struct clock_event_device cns3xxx
+ 	.features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ 	.set_mode	= cns3xxx_timer_set_mode,
+ 	.set_next_event	= cns3xxx_timer_set_next_event,
+-	.rating		= 350,
++	.rating		= 300,
+ 	.cpumask	= cpu_all_mask,
+ };
+ 
+@@ -215,6 +216,35 @@ static void __init cns3xxx_init_twd(void
+ #endif
+ }
+ 
++static cycle_t cns3xxx_get_cycles(struct clocksource *cs)
++{
++  u64 val;
++
++  val = readl(cns3xxx_tmr1 + TIMER_FREERUN_CONTROL_OFFSET);
++  val &= 0xffff;
++
++  return ((val << 32) | readl(cns3xxx_tmr1 + TIMER_FREERUN_OFFSET));
++}
++
++static struct clocksource clocksource_cns3xxx = {
++	.name = "freerun",
++	.rating = 200,
++	.read = cns3xxx_get_cycles,
++	.mask = CLOCKSOURCE_MASK(48),
++	.shift  = 16,
++	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,
++};
++
++static void __init cns3xxx_clocksource_init(void)
++{
++	/* Reset the FreeRunning counter */
++	writel((1 << 16), cns3xxx_tmr1 + TIMER_FREERUN_CONTROL_OFFSET);
++
++	clocksource_cns3xxx.mult =
++		clocksource_khz2mult(100, clocksource_cns3xxx.shift);
++	clocksource_register(&clocksource_cns3xxx);
++}
++
+ /*
+  * Set up the clock source and clock events devices
+  */
+@@ -232,13 +262,12 @@ static void __init __cns3xxx_timer_init(
+ 	/* stop free running timer3 */
+ 	writel(0, cns3xxx_tmr1 + TIMER_FREERUN_CONTROL_OFFSET);
+ 
+-	/* timer1 */
+-	writel(0x5C800, cns3xxx_tmr1 + TIMER1_COUNTER_OFFSET);
+-	writel(0x5C800, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
+-
+ 	writel(0, cns3xxx_tmr1 + TIMER1_MATCH_V1_OFFSET);
+ 	writel(0, cns3xxx_tmr1 + TIMER1_MATCH_V2_OFFSET);
+ 
++	val = (cns3xxx_cpu_clock() >> 3) * 1000000 / HZ;
++	writel(val, cns3xxx_tmr1 + TIMER1_COUNTER_OFFSET);
++
+ 	/* mask irq, non-mask timer1 overflow */
+ 	irq_mask = readl(cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
+ 	irq_mask &= ~(1 << 2);
+@@ -250,23 +279,9 @@ static void __init __cns3xxx_timer_init(
+ 	val |= (1 << 9);
+ 	writel(val, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
+ 
+-	/* timer2 */
+-	writel(0, cns3xxx_tmr1 + TIMER2_MATCH_V1_OFFSET);
+-	writel(0, cns3xxx_tmr1 + TIMER2_MATCH_V2_OFFSET);
+-
+-	/* mask irq */
+-	irq_mask = readl(cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
+-	irq_mask |= ((1 << 3) | (1 << 4) | (1 << 5));
+-	writel(irq_mask, cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
+-
+-	/* down counter */
+-	val = readl(cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
+-	val |= (1 << 10);
+-	writel(val, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
+-
+-	/* Make irqs happen for the system timer */
+ 	setup_irq(timer_irq, &cns3xxx_timer_irq);
+ 
++	cns3xxx_clocksource_init();
+ 	cns3xxx_clockevents_init(timer_irq);
+ 	cns3xxx_init_twd();
+ }