Hi,
On 15/01/2015 at 17:39:05 +0100, Daniel Lezcano wrote :
> On 01/12/2015 04:37 PM, Alexandre Belloni wrote:
> >Restarting on an at91rm9200 is handled by using the system timer. Move that
> >function to the system timer driver.
> >
> >Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
> >Acked-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> >---
> > arch/arm/mach-at91/at91rm9200.c | 11 -----------
> > drivers/clocksource/timer-atmel-st.c | 12 ++++++++++++
> > 2 files changed, 12 insertions(+), 11 deletions(-)
> >
> >diff --git a/arch/arm/mach-at91/at91rm9200.c b/arch/arm/mach-at91/at91rm9200.c
> >index b52916947535..4ea889cd6091 100644
> >--- a/arch/arm/mach-at91/at91rm9200.c
> >+++ b/arch/arm/mach-at91/at91rm9200.c
> >@@ -15,7 +15,6 @@
> >
> > #include <asm/mach/map.h>
> > #include <asm/system_misc.h>
> >-#include <mach/at91_st.h>
> > #include <mach/hardware.h>
> >
> > #include "soc.h"
> >@@ -30,15 +29,6 @@ static void at91rm9200_idle(void)
> > at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
> > }
> >
> >-static void at91rm9200_restart(enum reboot_mode reboot_mode, const char *cmd)
> >-{
> >- /*
> >- * Perform a hardware reset with the use of the Watchdog timer.
> >- */
> >- at91_st_write(AT91_ST_WDMR, AT91_ST_RSTEN | AT91_ST_EXTEN | 1);
> >- at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
> >-}
> >-
> > /* --------------------------------------------------------------------
> > * AT91RM9200 processor initialization
> > * -------------------------------------------------------------------- */
> >@@ -51,7 +41,6 @@ static void __init at91rm9200_map_io(void)
> > static void __init at91rm9200_initialize(void)
> > {
> > arm_pm_idle = at91rm9200_idle;
> >- arm_pm_restart = at91rm9200_restart;
> > }
> >
> >
> >diff --git a/drivers/clocksource/timer-atmel-st.c b/drivers/clocksource/timer-atmel-st.c
> >index 51761f8927b7..522583d6cc78 100644
> >--- a/drivers/clocksource/timer-atmel-st.c
> >+++ b/drivers/clocksource/timer-atmel-st.c
> >@@ -29,6 +29,7 @@
> > #include <linux/of_irq.h>
> >
> > #include <asm/mach/time.h>
> >+#include <asm/system_misc.h>
> >
> > #include <mach/at91_st.h>
> > #include <mach/hardware.h>
> >@@ -180,6 +181,15 @@ static struct clock_event_device clkevt = {
> > .set_mode = clkevt32k_mode,
> > };
> >
> >+static void at91rm9200_restart(enum reboot_mode reboot_mode, const char *cmd)
> >+{
> >+ /*
> >+ * Perform a hardware reset with the use of the Watchdog timer.
> >+ */
> >+ at91_st_write(AT91_ST_WDMR, AT91_ST_RSTEN | AT91_ST_EXTEN | 1);
> >+ at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
> >+}
> >+
> > void __iomem *at91_st_base;
> > EXPORT_SYMBOL_GPL(at91_st_base);
> >
> >@@ -248,4 +258,6 @@ void __init at91rm9200_timer_init(void)
> >
> > /* register clocksource */
> > clocksource_register_hz(&clk32k, AT91_SLOW_CLOCK);
> >+
> >+ arm_pm_restart = at91rm9200_restart;
> > }
>
> Mmh, I can't clearly explain why but I have a problem with that.
>
> Can you explain why restart code falls in the clockevents driver ?
>
>
That is a temporary location before getting rid of it by writing a
proper reset driver that will use the same syscon.
The main goal is to remove mach/at91_st.h and direct accesses to the
system timer registers.
--
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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