Move time.c from arch/arm/mach-pxa/time.c to
drivers/clocksource/pxa_timer.c.
Signed-off-by: Robert Jarzmik <[email protected]>
---
arch/arm/mach-pxa/Makefile | 2 +-
drivers/clocksource/Makefile | 1 +
arch/arm/mach-pxa/time.c => drivers/clocksource/pxa_timer.c | 0
3 files changed, 2 insertions(+), 1 deletion(-)
rename arch/arm/mach-pxa/time.c => drivers/clocksource/pxa_timer.c (100%)
diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile
index 648867a..2fe1824 100644
--- a/arch/arm/mach-pxa/Makefile
+++ b/arch/arm/mach-pxa/Makefile
@@ -4,7 +4,7 @@
# Common support (must be linked before board specific support)
obj-y += clock.o devices.o generic.o irq.o \
- time.o reset.o
+ reset.o
obj-$(CONFIG_PM) += pm.o sleep.o standby.o
# Generic drivers that other drivers may depend upon
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 98cb6c5..e224125 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_ARCH_BCM2835) += bcm2835_timer.o
obj-$(CONFIG_ARCH_MARCO) += timer-marco.o
obj-$(CONFIG_ARCH_MOXART) += moxart_timer.o
obj-$(CONFIG_ARCH_MXS) += mxs_timer.o
+obj-$(CONFIG_ARCH_PXA) += pxa_timer.o
obj-$(CONFIG_ARCH_PRIMA2) += timer-prima2.o
obj-$(CONFIG_ARCH_U300) += timer-u300.o
obj-$(CONFIG_SUN4I_TIMER) += sun4i_timer.o
diff --git a/arch/arm/mach-pxa/time.c b/drivers/clocksource/pxa_timer.c
similarity index 100%
rename from arch/arm/mach-pxa/time.c
rename to drivers/clocksource/pxa_timer.c
--
2.0.0.rc2
Add device-tree support to PXA platforms.
Signed-off-by: Robert Jarzmik <[email protected]>
---
drivers/clocksource/pxa_timer.c | 131 ++++++++++++++++++++++++++++++----------
1 file changed, 98 insertions(+), 33 deletions(-)
diff --git a/drivers/clocksource/pxa_timer.c b/drivers/clocksource/pxa_timer.c
index fca174e..67da3f5 100644
--- a/drivers/clocksource/pxa_timer.c
+++ b/drivers/clocksource/pxa_timer.c
@@ -15,14 +15,41 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
+#include <linux/clk.h>
#include <linux/clockchips.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#include <linux/sched_clock.h>
#include <asm/div64.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
-#include <mach/regs-ost.h>
#include <mach/irqs.h>
+#include <mach/hardware.h>
+
+#define OSMR0 0x00 /* */
+#define OSMR1 0x04 /* */
+#define OSMR2 0x08 /* */
+#define OSMR3 0x0C /* */
+#define OSMR4 0x80 /* */
+#define OSCR 0x10 /* OS Timer Counter Register */
+#define OSCR4 0x40 /* OS Timer Counter Register */
+#define OMCR4 0xC0 /* */
+#define OSSR 0x14 /* OS Timer Status Register */
+#define OWER 0x18 /* OS Timer Watchdog Enable Register */
+#define OIER 0x1C /* OS Timer Interrupt Enable Register */
+
+#define OSSR_M3 (1 << 3) /* Match status channel 3 */
+#define OSSR_M2 (1 << 2) /* Match status channel 2 */
+#define OSSR_M1 (1 << 1) /* Match status channel 1 */
+#define OSSR_M0 (1 << 0) /* Match status channel 0 */
+
+#define OWER_WME (1 << 0) /* Watchdog Match Enable */
+
+#define OIER_E3 (1 << 3) /* Interrupt enable channel 3 */
+#define OIER_E2 (1 << 2) /* Interrupt enable channel 2 */
+#define OIER_E1 (1 << 1) /* Interrupt enable channel 1 */
+#define OIER_E0 (1 << 0) /* Interrupt enable channel 0 */
/*
* This is PXA's sched_clock implementation. This has a resolution
@@ -33,9 +60,14 @@
* calls to sched_clock() which should always be the case in practice.
*/
+#define timer_readl(reg) readl_relaxed(timer_base + (reg))
+#define timer_writel(val, reg) writel_relaxed((val), timer_base + (reg))
+
+static void __iomem *timer_base;
+
static u64 notrace pxa_read_sched_clock(void)
{
- return readl_relaxed(OSCR);
+ return timer_readl(OSCR);
}
@@ -47,8 +79,8 @@ pxa_ost0_interrupt(int irq, void *dev_id)
struct clock_event_device *c = dev_id;
/* Disarm the compare/match, signal the event. */
- writel_relaxed(readl_relaxed(OIER) & ~OIER_E0, OIER);
- writel_relaxed(OSSR_M0, OSSR);
+ timer_writel(timer_readl(OIER) & ~OIER_E0, OIER);
+ timer_writel(OSSR_M0, OSSR);
c->event_handler(c);
return IRQ_HANDLED;
@@ -59,10 +91,10 @@ pxa_osmr0_set_next_event(unsigned long delta, struct clock_event_device *dev)
{
unsigned long next, oscr;
- writel_relaxed(readl_relaxed(OIER) | OIER_E0, OIER);
- next = readl_relaxed(OSCR) + delta;
- writel_relaxed(next, OSMR0);
- oscr = readl_relaxed(OSCR);
+ timer_writel(timer_readl(OIER) | OIER_E0, OIER);
+ next = timer_readl(OSCR) + delta;
+ timer_writel(next, OSMR0);
+ oscr = timer_readl(OSCR);
return (signed)(next - oscr) <= MIN_OSCR_DELTA ? -ETIME : 0;
}
@@ -72,15 +104,15 @@ pxa_osmr0_set_mode(enum clock_event_mode mode, struct clock_event_device *dev)
{
switch (mode) {
case CLOCK_EVT_MODE_ONESHOT:
- writel_relaxed(readl_relaxed(OIER) & ~OIER_E0, OIER);
- writel_relaxed(OSSR_M0, OSSR);
+ timer_writel(timer_readl(OIER) & ~OIER_E0, OIER);
+ timer_writel(OSSR_M0, OSSR);
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
/* initializing, released, or preparing for suspend */
- writel_relaxed(readl_relaxed(OIER) & ~OIER_E0, OIER);
- writel_relaxed(OSSR_M0, OSSR);
+ timer_writel(timer_readl(OIER) & ~OIER_E0, OIER);
+ timer_writel(OSSR_M0, OSSR);
break;
case CLOCK_EVT_MODE_RESUME:
@@ -94,12 +126,12 @@ static unsigned long osmr[4], oier, oscr;
static void pxa_timer_suspend(struct clock_event_device *cedev)
{
- osmr[0] = readl_relaxed(OSMR0);
- osmr[1] = readl_relaxed(OSMR1);
- osmr[2] = readl_relaxed(OSMR2);
- osmr[3] = readl_relaxed(OSMR3);
- oier = readl_relaxed(OIER);
- oscr = readl_relaxed(OSCR);
+ osmr[0] = timer_readl(OSMR0);
+ osmr[1] = timer_readl(OSMR1);
+ osmr[2] = timer_readl(OSMR2);
+ osmr[3] = timer_readl(OSMR3);
+ oier = timer_readl(OIER);
+ oscr = timer_readl(OSCR);
}
static void pxa_timer_resume(struct clock_event_device *cedev)
@@ -113,12 +145,12 @@ static void pxa_timer_resume(struct clock_event_device *cedev)
if (osmr[0] - oscr < MIN_OSCR_DELTA)
osmr[0] += MIN_OSCR_DELTA;
- writel_relaxed(osmr[0], OSMR0);
- writel_relaxed(osmr[1], OSMR1);
- writel_relaxed(osmr[2], OSMR2);
- writel_relaxed(osmr[3], OSMR3);
- writel_relaxed(oier, OIER);
- writel_relaxed(oscr, OSCR);
+ timer_writel(osmr[0], OSMR0);
+ timer_writel(osmr[1], OSMR1);
+ timer_writel(osmr[2], OSMR2);
+ timer_writel(osmr[3], OSMR3);
+ timer_writel(oier, OIER);
+ timer_writel(oscr, OSCR);
}
#else
#define pxa_timer_suspend NULL
@@ -142,21 +174,54 @@ static struct irqaction pxa_ost0_irq = {
.dev_id = &ckevt_pxa_osmr0,
};
-void __init pxa_timer_init(void)
+static void pxa_timer_common_init(int irq, unsigned long clock_tick_rate)
{
- unsigned long clock_tick_rate = get_clock_tick_rate();
-
- writel_relaxed(0, OIER);
- writel_relaxed(OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3, OSSR);
+ timer_writel(0, OIER);
+ timer_writel(OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3, OSSR);
sched_clock_register(pxa_read_sched_clock, 32, clock_tick_rate);
ckevt_pxa_osmr0.cpumask = cpumask_of(0);
- setup_irq(IRQ_OST0, &pxa_ost0_irq);
+ setup_irq(irq, &pxa_ost0_irq);
- clocksource_mmio_init(OSCR, "oscr0", clock_tick_rate, 200, 32,
- clocksource_mmio_readl_up);
+ clocksource_mmio_init(timer_base + OSCR, "oscr0", clock_tick_rate, 200,
+ 32, clocksource_mmio_readl_up);
clockevents_config_and_register(&ckevt_pxa_osmr0, clock_tick_rate,
- MIN_OSCR_DELTA * 2, 0x7fffffff);
+ MIN_OSCR_DELTA * 2, 0x7fffffff);
+}
+
+static void __init pxa_timer_dt_init(struct device_node *np)
+{
+ struct clk *clk;
+ int irq;
+
+ /* timer registers are shared with watchdog timer */
+ timer_base = of_iomap(np, 0);
+ if (!timer_base)
+ panic("%s: unable to map resource\n", np->name);
+
+ clk = of_clk_get(np, 0);
+ if (IS_ERR(clk))
+ panic("%s: unable to get clk\n", np->name);
+ clk_prepare_enable(clk);
+
+ /* we are only interested in OS-timer0 irq */
+ irq = irq_of_parse_and_map(np, 0);
+ if (irq <= 0)
+ panic("%s: unable to parse OS-timer0 irq\n", np->name);
+
+ pxa_timer_common_init(irq, clk_get_rate(clk));
+}
+CLOCKSOURCE_OF_DECLARE(pxa_timer, "marvell,pxa-timer", pxa_timer_dt_init);
+
+/*
+ * Legacy timer init for non device-tree boards.
+ */
+void __init pxa_timer_init(void)
+{
+ unsigned long clock_tick_rate = get_clock_tick_rate();
+
+ timer_base = io_p2v(0x40a00000);
+ pxa_timer_common_init(IRQ_OST0, clock_tick_rate);
}
--
2.0.0.rc2
Select CLKSRC_OF for PXA architectures, as the clocksource
driver can be also initialized from device-tree.
Signed-off-by: Robert Jarzmik <[email protected]>
Cc: Russell King <[email protected]>
---
arch/arm/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index db3c541..c300b68 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -646,6 +646,7 @@ config ARCH_PXA
select AUTO_ZRELADDR
select CLKDEV_LOOKUP
select CLKSRC_MMIO
+ select CLKSRC_OF if OF
select GENERIC_CLOCKEVENTS
select GPIO_PXA
select HAVE_IDE
--
2.0.0.rc2
Robert Jarzmik <[email protected]> writes:
> Move time.c from arch/arm/mach-pxa/time.c to
> drivers/clocksource/pxa_timer.c.
>
> Signed-off-by: Robert Jarzmik <[email protected]>
Ping ?
Cheers.
--
Robert
On Sun, Jun 22, 2014 at 6:09 AM, Robert Jarzmik <[email protected]> wrote:
> Move time.c from arch/arm/mach-pxa/time.c to
> drivers/clocksource/pxa_timer.c.
>
> Signed-off-by: Robert Jarzmik <[email protected]>
> ---
> arch/arm/mach-pxa/Makefile | 2 +-
> drivers/clocksource/Makefile | 1 +
> arch/arm/mach-pxa/time.c => drivers/clocksource/pxa_timer.c | 0
> 3 files changed, 2 insertions(+), 1 deletion(-)
> rename arch/arm/mach-pxa/time.c => drivers/clocksource/pxa_timer.c (100%)
>
> diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile
> index 648867a..2fe1824 100644
> --- a/arch/arm/mach-pxa/Makefile
> +++ b/arch/arm/mach-pxa/Makefile
> @@ -4,7 +4,7 @@
>
> # Common support (must be linked before board specific support)
> obj-y += clock.o devices.o generic.o irq.o \
> - time.o reset.o
> + reset.o
> obj-$(CONFIG_PM) += pm.o sleep.o standby.o
>
> # Generic drivers that other drivers may depend upon
> diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
> index 98cb6c5..e224125 100644
> --- a/drivers/clocksource/Makefile
> +++ b/drivers/clocksource/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_ARCH_BCM2835) += bcm2835_timer.o
> obj-$(CONFIG_ARCH_MARCO) += timer-marco.o
> obj-$(CONFIG_ARCH_MOXART) += moxart_timer.o
> obj-$(CONFIG_ARCH_MXS) += mxs_timer.o
> +obj-$(CONFIG_ARCH_PXA) += pxa_timer.o
> obj-$(CONFIG_ARCH_PRIMA2) += timer-prima2.o
> obj-$(CONFIG_ARCH_U300) += timer-u300.o
> obj-$(CONFIG_SUN4I_TIMER) += sun4i_timer.o
> diff --git a/arch/arm/mach-pxa/time.c b/drivers/clocksource/pxa_timer.c
> similarity index 100%
> rename from arch/arm/mach-pxa/time.c
> rename to drivers/clocksource/pxa_timer.c
> --
> 2.0.0.rc2
>
Acked-by: Haojian Zhuang <[email protected]>
Acked for all these three patches.
Regards
Haojian
On 06/22/2014 12:09 AM, Robert Jarzmik wrote:
> Add device-tree support to PXA platforms.
>
> Signed-off-by: Robert Jarzmik <[email protected]>
> ---
> drivers/clocksource/pxa_timer.c | 131 ++++++++++++++++++++++++++++++----------
> 1 file changed, 98 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/clocksource/pxa_timer.c b/drivers/clocksource/pxa_timer.c
> index fca174e..67da3f5 100644
> --- a/drivers/clocksource/pxa_timer.c
> +++ b/drivers/clocksource/pxa_timer.c
> @@ -15,14 +15,41 @@
> #include <linux/kernel.h>
> #include <linux/init.h>
> #include <linux/interrupt.h>
> +#include <linux/clk.h>
> #include <linux/clockchips.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> #include <linux/sched_clock.h>
>
> #include <asm/div64.h>
> #include <asm/mach/irq.h>
> #include <asm/mach/time.h>
> -#include <mach/regs-ost.h>
> #include <mach/irqs.h>
> +#include <mach/hardware.h>
Now as the driver is in 'drivers', do not reference the headers files in
mach. Moving the driver to the drivers directory implies some cleanup
with the headers dependencies.
> +#define OSMR0 0x00 /* */
> +#define OSMR1 0x04 /* */
> +#define OSMR2 0x08 /* */
> +#define OSMR3 0x0C /* */
> +#define OSMR4 0x80 /* */
Can you please remove those unused empty comment or fill them with
something appropriate.
> +#define OSCR 0x10 /* OS Timer Counter Register */
> +#define OSCR4 0x40 /* OS Timer Counter Register */
> +#define OMCR4 0xC0 /* */
> +#define OSSR 0x14 /* OS Timer Status Register */
> +#define OWER 0x18 /* OS Timer Watchdog Enable Register */
> +#define OIER 0x1C /* OS Timer Interrupt Enable Register */
> +
> +#define OSSR_M3 (1 << 3) /* Match status channel 3 */
> +#define OSSR_M2 (1 << 2) /* Match status channel 2 */
> +#define OSSR_M1 (1 << 1) /* Match status channel 1 */
> +#define OSSR_M0 (1 << 0) /* Match status channel 0 */
> +
> +#define OWER_WME (1 << 0) /* Watchdog Match Enable */
> +
> +#define OIER_E3 (1 << 3) /* Interrupt enable channel 3 */
> +#define OIER_E2 (1 << 2) /* Interrupt enable channel 2 */
> +#define OIER_E1 (1 << 1) /* Interrupt enable channel 1 */
> +#define OIER_E0 (1 << 0) /* Interrupt enable channel 0 */
Is it possible to do some cleanups around regs-ost.h and here in order
to remove the unused macros. Also, it seems some define will be
duplicate as they are shared with the watchdog. Any plan to fix that ?
> /*
> * This is PXA's sched_clock implementation. This has a resolution
> @@ -33,9 +60,14 @@
> * calls to sched_clock() which should always be the case in practice.
> */
>
> +#define timer_readl(reg) readl_relaxed(timer_base + (reg))
> +#define timer_writel(val, reg) writel_relaxed((val), timer_base + (reg))
> +
> +static void __iomem *timer_base;
> +
> static u64 notrace pxa_read_sched_clock(void)
> {
> - return readl_relaxed(OSCR);
So here there is a change which is not explained in the changelog
(timer_base offset).
Even it is obvious for me because I am used to see this kind of code,
that would deserve a better description in the changelog.
> + return timer_readl(OSCR);
> }
>
[ ... ]
> +static void __init pxa_timer_dt_init(struct device_node *np)
> +{
> + struct clk *clk;
> + int irq;
> +
> + /* timer registers are shared with watchdog timer */
> + timer_base = of_iomap(np, 0);
> + if (!timer_base)
> + panic("%s: unable to map resource\n", np->name);
> +
> + clk = of_clk_get(np, 0);
> + if (IS_ERR(clk))
> + panic("%s: unable to get clk\n", np->name);
> + clk_prepare_enable(clk);
> +
> + /* we are only interested in OS-timer0 irq */
> + irq = irq_of_parse_and_map(np, 0);
> + if (irq <= 0)
> + panic("%s: unable to parse OS-timer0 irq\n", np->name);
Is the 'panic' desirable ? The clksrc-of is written in a way to use
different clocks, no ?
> +
> + pxa_timer_common_init(irq, clk_get_rate(clk));
> +}
> +CLOCKSOURCE_OF_DECLARE(pxa_timer, "marvell,pxa-timer", pxa_timer_dt_init);
> +
> +/*
> + * Legacy timer init for non device-tree boards.
> + */
> +void __init pxa_timer_init(void)
> +{
> + unsigned long clock_tick_rate = get_clock_tick_rate();
> +
> + timer_base = io_p2v(0x40a00000);
> + pxa_timer_common_init(IRQ_OST0, clock_tick_rate);
> }
>
--
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Daniel Lezcano <[email protected]> writes:
>> -#include <mach/regs-ost.h>
>> #include <mach/irqs.h>
>> +#include <mach/hardware.h>
>
> Now as the driver is in 'drivers', do not reference the headers files in
> mach. Moving the driver to the drivers directory implies some cleanup with the
> headers dependencies.
I don't see that very possible.
Or said another way, I don't see how the irq number, IRQ_OST0 (in mach/irqs.h)
can be guessed for non device-tree configuration.
>> +#define OSMR0 0x00 /* */
>> +#define OSMR1 0x04 /* */
>> +#define OSMR2 0x08 /* */
>> +#define OSMR3 0x0C /* */
>> +#define OSMR4 0x80 /* */
>
> Can you please remove those unused empty comment or fill them with something
> appropriate.
Sure.
>
>> +#define OSCR 0x10 /* OS Timer Counter Register */
>> +#define OSCR4 0x40 /* OS Timer Counter Register */
>> +#define OMCR4 0xC0 /* */
>> +#define OSSR 0x14 /* OS Timer Status Register */
>> +#define OWER 0x18 /* OS Timer Watchdog Enable Register */
>> +#define OIER 0x1C /* OS Timer Interrupt Enable Register */
>> +
>> +#define OSSR_M3 (1 << 3) /* Match status channel 3 */
>> +#define OSSR_M2 (1 << 2) /* Match status channel 2 */
>> +#define OSSR_M1 (1 << 1) /* Match status channel 1 */
>> +#define OSSR_M0 (1 << 0) /* Match status channel 0 */
>> +
>> +#define OWER_WME (1 << 0) /* Watchdog Match Enable */
>> +
>> +#define OIER_E3 (1 << 3) /* Interrupt enable channel 3 */
>> +#define OIER_E2 (1 << 2) /* Interrupt enable channel 2 */
>> +#define OIER_E1 (1 << 1) /* Interrupt enable channel 1 */
>> +#define OIER_E0 (1 << 0) /* Interrupt enable channel 0 */
>
> Is it possible to do some cleanups around regs-ost.h and here in order to remove
> the unused macros. Also, it seems some define will be duplicate as they are
> shared with the watchdog. Any plan to fix that ?
For the cleanup, yes, will do.
For the watchdog I don't have any plan yet. This patch's purpose is only to
bring the PXA time source to drivers/clocksource, and make it compatible with
both device-tree and non device-tree builds.
>> @@ -33,9 +60,14 @@
>> * calls to sched_clock() which should always be the case in practice.
>> */
>>
>> +#define timer_readl(reg) readl_relaxed(timer_base + (reg))
>> +#define timer_writel(val, reg) writel_relaxed((val), timer_base + (reg))
>> +
>> +static void __iomem *timer_base;
>> +
>> static u64 notrace pxa_read_sched_clock(void)
>> {
>> - return readl_relaxed(OSCR);
>
> So here there is a change which is not explained in the changelog (timer_base
> offset).
>
> Even it is obvious for me because I am used to see this kind of code, that would
> deserve a better description in the changelog.
OK, I'll add the backward compatibility explanation with non device-tree builds,
and the necessary timer_base iomem hard encoded value. And the Janus double face
explanation of the driver (both DT and non-DT oriented).
Another question brought up by this : if I remove all 'mach/' includes, I loose
io_p2v() right ? How can I guess timer_base then ?
>> + /* we are only interested in OS-timer0 irq */
>> + irq = irq_of_parse_and_map(np, 0);
>> + if (irq <= 0)
>> + panic("%s: unable to parse OS-timer0 irq\n", np->name);
>
> Is the 'panic' desirable ? The clksrc-of is written in a way to use different
> clocks, no ?
Good question.
Maybe not, I followed the same rationale as in orion-timer, which is :
- as this timer is the only possible timer for PXA boards, and because without
it the kernel boot will stall (scheduling will be blocked), it's better to
panic early that to remain stalled.
Isn't this a good approach ?
--
Robert
Robert Jarzmik <[email protected]> writes:
> Daniel Lezcano <[email protected]> writes:
>
>>> -#include <mach/regs-ost.h>
>>> #include <mach/irqs.h>
>>> +#include <mach/hardware.h>
>>
>> Now as the driver is in 'drivers', do not reference the headers files in
>> mach. Moving the driver to the drivers directory implies some cleanup with the
>> headers dependencies.
> I don't see that very possible.
> Or said another way, I don't see how the irq number, IRQ_OST0 (in mach/irqs.h)
> can be guessed for non device-tree configuration.
Oh yeah, a simple parameter to pxa_init_timer() will do the trick ...
> Another question brought up by this : if I remove all 'mach/' includes, I loose
> io_p2v() right ? How can I guess timer_base then ?
And same answer here, a simple parameter to pxa_init_timer() will solve this
too.
Cheers.
--
Robert
On 07/03/2014 07:31 PM, Robert Jarzmik wrote:
> Daniel Lezcano <[email protected]> writes:
>
>>> -#include <mach/regs-ost.h>
>>> #include <mach/irqs.h>
>>> +#include <mach/hardware.h>
>>
>> Now as the driver is in 'drivers', do not reference the headers files in
>> mach. Moving the driver to the drivers directory implies some cleanup with the
>> headers dependencies.
> I don't see that very possible.
> Or said another way, I don't see how the irq number, IRQ_OST0 (in mach/irqs.h)
> can be guessed for non device-tree configuration.
>
>>> +#define OSMR0 0x00 /* */
>>> +#define OSMR1 0x04 /* */
>>> +#define OSMR2 0x08 /* */
>>> +#define OSMR3 0x0C /* */
>>> +#define OSMR4 0x80 /* */
>>
>> Can you please remove those unused empty comment or fill them with something
>> appropriate.
> Sure.
>
>>
>>> +#define OSCR 0x10 /* OS Timer Counter Register */
>>> +#define OSCR4 0x40 /* OS Timer Counter Register */
>>> +#define OMCR4 0xC0 /* */
>>> +#define OSSR 0x14 /* OS Timer Status Register */
>>> +#define OWER 0x18 /* OS Timer Watchdog Enable Register */
>>> +#define OIER 0x1C /* OS Timer Interrupt Enable Register */
>>> +
>>> +#define OSSR_M3 (1 << 3) /* Match status channel 3 */
>>> +#define OSSR_M2 (1 << 2) /* Match status channel 2 */
>>> +#define OSSR_M1 (1 << 1) /* Match status channel 1 */
>>> +#define OSSR_M0 (1 << 0) /* Match status channel 0 */
>>> +
>>> +#define OWER_WME (1 << 0) /* Watchdog Match Enable */
>>> +
>>> +#define OIER_E3 (1 << 3) /* Interrupt enable channel 3 */
>>> +#define OIER_E2 (1 << 2) /* Interrupt enable channel 2 */
>>> +#define OIER_E1 (1 << 1) /* Interrupt enable channel 1 */
>>> +#define OIER_E0 (1 << 0) /* Interrupt enable channel 0 */
>>
>> Is it possible to do some cleanups around regs-ost.h and here in order to remove
>> the unused macros. Also, it seems some define will be duplicate as they are
>> shared with the watchdog. Any plan to fix that ?
> For the cleanup, yes, will do.
>
> For the watchdog I don't have any plan yet. This patch's purpose is only to
> bring the PXA time source to drivers/clocksource, and make it compatible with
> both device-tree and non device-tree builds.
>
>>> @@ -33,9 +60,14 @@
>>> * calls to sched_clock() which should always be the case in practice.
>>> */
>>>
>>> +#define timer_readl(reg) readl_relaxed(timer_base + (reg))
>>> +#define timer_writel(val, reg) writel_relaxed((val), timer_base + (reg))
>>> +
>>> +static void __iomem *timer_base;
>>> +
>>> static u64 notrace pxa_read_sched_clock(void)
>>> {
>>> - return readl_relaxed(OSCR);
>>
>> So here there is a change which is not explained in the changelog (timer_base
>> offset).
>>
>> Even it is obvious for me because I am used to see this kind of code, that would
>> deserve a better description in the changelog.
> OK, I'll add the backward compatibility explanation with non device-tree builds,
> and the necessary timer_base iomem hard encoded value. And the Janus double face
> explanation of the driver (both DT and non-DT oriented).
>
> Another question brought up by this : if I remove all 'mach/' includes, I loose
> io_p2v() right ? How can I guess timer_base then ?
>
>>> + /* we are only interested in OS-timer0 irq */
>>> + irq = irq_of_parse_and_map(np, 0);
>>> + if (irq <= 0)
>>> + panic("%s: unable to parse OS-timer0 irq\n", np->name);
>>
>> Is the 'panic' desirable ? The clksrc-of is written in a way to use different
>> clocks, no ?
> Good question.
>
> Maybe not, I followed the same rationale as in orion-timer, which is :
> - as this timer is the only possible timer for PXA boards, and because without
> it the kernel boot will stall (scheduling will be blocked), it's better to
> panic early that to remain stalled.
There isn't the arm global timer ?
> Isn't this a good approach ?
I suppose we can live with that. IMO, the right fix would be in
clksrc-of to pr_crit a message when an initialization fails. But that
means to change all the init functions for all drivers which is out of
the scope of this patchset.
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Daniel Lezcano <[email protected]> writes:
>> Good question.
>>
>> Maybe not, I followed the same rationale as in orion-timer, which is :
>> - as this timer is the only possible timer for PXA boards, and because without
>> it the kernel boot will stall (scheduling will be blocked), it's better to
>> panic early that to remain stalled.
>
> There isn't the arm global timer ?
Nope, it's for Cortex-A9 AFAIK, and my poor platform is an old ARMv5 SoC.
>
>> Isn't this a good approach ?
>
> I suppose we can live with that. IMO, the right fix would be in clksrc-of to
> pr_crit a message when an initialization fails. But that means to change all the
> init functions for all drivers which is out of the scope of this patchset.
OK, you convinced me. I'll trade the panic() for a pr_crit(). Good idea, maybe
it will trigger a quest of a white knight for the other drivers :)
Cheers.
--
Robert