On 2015年01月05日 15:55, Suthikulpanit, Suravee wrote:
On 1/4/15, 04:55, "Hanjun Guo" <hanjun.guo@xxxxxxxxxx> wrote:
Using the information presented by GTDT to initialize the arch
timer (not memory-mapped).
Originally-by: Amit Daniel Kachhap <amit.daniel@xxxxxxxxxxx>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
arch/arm64/kernel/time.c | 7 ++
drivers/clocksource/arm_arch_timer.c | 132
++++++++++++++++++++++++++++-------
include/linux/clocksource.h | 6 ++
3 files changed, 118 insertions(+), 27 deletions(-)
[...]
+static void __init arch_timer_of_init(struct device_node *np)
+{
+ int i;
+
+ if (arch_timers_present & ARCH_CP15_TIMER) {
+ pr_warn("arch_timer: multiple nodes in dt, skipping\n");
+ return;
+ }
+
+ arch_timers_present |= ARCH_CP15_TIMER;
+ for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++)
+ arch_timer_ppi[i] = irq_of_parse_and_map(np, i);
+
+ arch_timer_detect_rate(NULL, np);
+
+ arch_timer_c3stop = !of_property_read_bool(np, "always-on");
+
+ /*
+ * If we cannot rely on firmware initializing the timer registers then
+ * we should use the physical timers instead.
+ */
+ if (IS_ENABLED(CONFIG_ARM) &&
+ of_property_read_bool(np, "arm,cpu-registers-not-fw-configured"))
+ arch_timer_use_virtual = false;
+
+ arch_timer_init();
+}
+CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer",
arch_timer_of_init);
+CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer",
arch_timer_of_init);
Hanjun,
FYI, it seems that the tree that you have rebased the patch series has an
issue determining clocksource in ARM64 introduced by this commit.
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0
b46b8a718c6e90910a1b1b0fe797be3c167e186
Here is the fix from Catalin that already went upstream:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drive
rs/clocksource/arm_arch_timer.c?id=d6ad36913083d683aad4e02e53580c995f1a6ede
This bug fix patch was merged in Dec 30 by Linus, which is the date
after 3.19-rc2 released :)
Thanks
Hanjun
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