Like several of the other files in drivers/clocksource,
tegra20_timer.c contains code that can only compile when CONFIG_ARM is
enabled. This causes obvious problems when trying to compile this
code for NVIDIA ARM64-based SoCs, such as Tegra132. The same timer IP
blocks exist, so it seems appropriate to provide support for them.
So until we figure out a better way to partition this code, wrap the
delay_timer and persistent_clock support code with preprocessor tests
for CONFIG_ARM. (The delay_timer code should not be needed at all on
ARM64 due to the presence of the ARMv8 architected timer. The
persistent_clock support code could become important once power
management modes are implemented that turn off the CPU complex.)
Signed-off-by: Paul Walmsley <paul@xxxxxxxxx>
Signed-off-by: Paul Walmsley <pwalmsley@xxxxxxxxxx>
Cc: Allen Martin <amartin@xxxxxxxxxx>
Cc: Stephen Warren <swarren@xxxxxxxxxx>
Cc: Thierry Reding <treding@xxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Alexandre Courbot <gnurou@xxxxxxxxx>
---
Applies against next-20141209.
Intended for v3.20.
Boot-tested on Tegra124 Jetson TK1 on next-20141209.
Also boot-tested on Tegra132 Norrin FFD on next-20141209 + extra,
unrelated patches.
drivers/clocksource/tegra20_timer.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/clocksource/tegra20_timer.c b/drivers/clocksource/tegra20_timer.c
index d2616ef16770..83a8f5c9e139 100644
--- a/drivers/clocksource/tegra20_timer.c
+++ b/drivers/clocksource/tegra20_timer.c
@@ -29,8 +29,10 @@
#include <linux/sched_clock.h>
#include <linux/delay.h>
+#ifdef CONFIG_ARM
#include <asm/mach/time.h>
#include <asm/smp_twd.h>
+#endif
#define RTC_SECONDS 0x08
#define RTC_SHADOW_SECONDS 0x0c
@@ -49,12 +51,14 @@
#define TIMER_PCR 0x4
static void __iomem *timer_reg_base;
+#ifdef CONFIG_ARM
static void __iomem *rtc_base;
static struct timespec persistent_ts;
static u64 persistent_ms, last_persistent_ms;
static struct delay_timer tegra_delay_timer;
+#endif
#define timer_writel(value, reg) \
__raw_writel(value, timer_reg_base + (reg))
@@ -106,6 +110,7 @@ static u64 notrace tegra_read_sched_clock(void)
return timer_readl(TIMERUS_CNTR_1US);
}
+#ifdef CONFIG_ARM
/*
* tegra_rtc_read - Reads the Tegra RTC registers
* Care must be taken that this funciton is not called while the
@@ -146,6 +151,8 @@ static unsigned long tegra_delay_timer_read_counter_long(void)
{
return readl(timer_reg_base + TIMERUS_CNTR_1US);
}
+#endif /* CONFIG_ARM */
+
static irqreturn_t tegra_timer_interrupt(int irq, void *dev_id)
{
@@ -214,10 +221,12 @@ static void __init tegra20_init_timer(struct device_node *np)
BUG();
}
+#ifdef CONFIG_ARM
tegra_delay_timer.read_current_timer =
tegra_delay_timer_read_counter_long;
tegra_delay_timer.freq = 1000000;
register_current_timer_delay(&tegra_delay_timer);
+#endif
ret = setup_irq(tegra_timer_irq.irq, &tegra_timer_irq);
if (ret) {
@@ -232,6 +241,7 @@ static void __init tegra20_init_timer(struct device_node *np)
}
CLOCKSOURCE_OF_DECLARE(tegra20_timer, "nvidia,tegra20-timer", tegra20_init_timer);
+#ifdef CONFIG_ARM
static void __init tegra20_init_rtc(struct device_node *np)
{
struct clk *clk;
@@ -255,6 +265,7 @@ static void __init tegra20_init_rtc(struct device_node *np)
register_persistent_clock(NULL, tegra_read_persistent_clock);
}
CLOCKSOURCE_OF_DECLARE(tegra20_rtc, "nvidia,tegra20-rtc", tegra20_init_rtc);
+#endif /* CONFIG_ARM */
#ifdef CONFIG_PM
static u32 usec_config;
--
2.1.3
--
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