clocksource: dw_apb_timer: infrastructure to handle quirks
From: Heiko Stuebner <heiko@...> Date: Thu, 27 Jun 2013 12:53:40 +0200
Commit-Message
There exist variants of the timer IP with some modified properties. Therefore add infrastructure to handle hardware-quirks in the driver. Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
arch/x86/kernel/apb_timer.c | 4 ++-- drivers/clocksource/dw_apb_timer.c | 7 +++++-- drivers/clocksource/dw_apb_timer_of.c | 4 ++-- include/linux/dw_apb_timer.h | 6 ++++-- 4 files changed, 13 insertions(+), 8 deletions(-)
Statistics
- 13 lines added
- 8 lines removed
Changes
------------------------- arch/x86/kernel/apb_timer.c --------------------------
index c9876ef..e7fe0f6 100644
@@ -121,7 +121,7 @@ static inline void apbt_set_mapping(void)
clocksource_apbt = dw_apb_clocksource_init(APBT_CLOCKSOURCE_RATING,
"apbt0", apbt_virt_address + phy_cs_timer_id *
+ APBTMRS_REG_SIZE, apbt_freq, 0);
return;
panic_noapbt:
@@ -159,7 +159,7 @@ static int __init apbt_clockevent_register(void)
adev->timer = dw_apb_clockevent_init(smp_processor_id(), "apbt0",
mrst_timer_options == MRST_TIMER_LAPIC_APBT ?
APBT_CLOCKEVENT_RATING - 100 : APBT_CLOCKEVENT_RATING,
+ adev_virt_addr(adev), 0, apbt_freq, 0);
/* Firmware does EOI handling for us. */
adev->timer->eoi = NULL;
---------------------- drivers/clocksource/dw_apb_timer.c ----------------------
index 8c2a35f..01bdac0 100644
@@ -213,7 +213,8 @@ static int apbt_next_event(unsigned long delta,
*/
struct dw_apb_clock_event_device *
dw_apb_clockevent_init(int cpu, const char *name, unsigned rating,
+ void __iomem *base, int irq, unsigned long freq,
+ int quirks)
{
struct dw_apb_clock_event_device *dw_ced =
kzalloc(sizeof(*dw_ced), GFP_KERNEL);
@@ -225,6 +226,7 @@ dw_apb_clockevent_init(int cpu, const char *name, unsigned rating,
dw_ced->timer.base = base;
dw_ced->timer.irq = irq;
dw_ced->timer.freq = freq;
+ dw_ced->timer.quirks = quirks;
clockevents_calc_mult_shift(&dw_ced->ced, freq, APBT_MIN_PERIOD);
dw_ced->ced.max_delta_ns = clockevent_delta2ns(0x7fffffff,
@@ -349,7 +351,7 @@ static void apbt_restart_clocksource(struct clocksource *cs)
*/
struct dw_apb_clocksource *
dw_apb_clocksource_init(unsigned rating, const char *name, void __iomem *base,
+ unsigned long freq, int quirks)
{
struct dw_apb_clocksource *dw_cs = kzalloc(sizeof(*dw_cs), GFP_KERNEL);
@@ -358,6 +360,7 @@ dw_apb_clocksource_init(unsigned rating, const char *name, void __iomem *base,
dw_cs->timer.base = base;
dw_cs->timer.freq = freq;
+ dw_cs->timer.quirks = quirks;
dw_cs->cs.name = name;
dw_cs->cs.rating = rating;
dw_cs->cs.read = __apbt_read_clocksource;
-------------------- drivers/clocksource/dw_apb_timer_of.c ---------------------
index cef5544..b5412af 100644
@@ -74,7 +74,7 @@ static void add_clockevent(struct device_node *event_timer)
timer_get_base_and_rate(event_timer, &iobase, &rate);
ced = dw_apb_clockevent_init(0, event_timer->name, 300, iobase, irq,
+ rate, 0);
if (!ced)
panic("Unable to initialise clockevent device");
@@ -92,7 +92,7 @@ static void add_clocksource(struct device_node *source_timer)
timer_get_base_and_rate(source_timer, &iobase, &rate);
+ cs = dw_apb_clocksource_init(300, source_timer->name, iobase, rate, 0);
if (!cs)
panic("Unable to initialise clocksource device");
------------------------- include/linux/dw_apb_timer.h -------------------------
index 07261d5..67d09c7 100644
@@ -23,6 +23,7 @@ struct dw_apb_timer {
void __iomem *base;
unsigned long freq;
int irq;
+ int quirks;
};
struct dw_apb_clock_event_device {
@@ -44,10 +45,11 @@ void dw_apb_clockevent_stop(struct dw_apb_clock_event_device *dw_ced);
struct dw_apb_clock_event_device *
dw_apb_clockevent_init(int cpu, const char *name, unsigned rating,
+ void __iomem *base, int irq, unsigned long freq,
+ int quirks);
struct dw_apb_clocksource *
dw_apb_clocksource_init(unsigned rating, const char *name, void __iomem *base,
+ unsigned long freq, int quirks);
void dw_apb_clocksource_register(struct dw_apb_clocksource *dw_cs);
void dw_apb_clocksource_start(struct dw_apb_clocksource *dw_cs);
cycle_t dw_apb_clocksource_read(struct dw_apb_clocksource *dw_cs);