| Message ID | 201306041138.42639.heiko@sntech.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Heiko, On Tue, Jun 04, 2013 at 11:38:42AM +0200, Heiko Stübner wrote: > dw_apb_timer_init used to search the devicetree for matching timer > devices, making calls to it from board files necessary. > > Change the dw_apb_timer_init to work with CLOCKSOURCE_OF_DECLARE. > With this change the function gets called once for each timer node > and tracks these number of calls to attach clockevent and clocksource > devices to the nodes. > > Also remove the calls to dw_apb_timer_init from all previous users, as > clocksource_of_init is the default for init_time now. > > Tested on the upcoming rk3066 code. > > Signed-off-by: Heiko Stuebner <heiko@sntech.de> > Acked-by: Rob Herring <rob.herring@calxeda.com> > Acked-by: Arnd Bergmann <arnd@arndb.de> > --- ... > -void __init dw_apb_timer_init(void) > +static int num_called; > +static void __init dw_apb_timer_init(struct device_node *timer) > { > - struct device_node *event_timer, *source_timer; > - > - event_timer = of_find_matching_node(NULL, osctimer_ids); > - if (!event_timer) > - panic("No timer for clockevent"); > - add_clockevent(event_timer); > - > - source_timer = of_find_matching_node(event_timer, osctimer_ids); > - if (!source_timer) > - panic("No timer for clocksource"); > - add_clocksource(source_timer); > - > - of_node_put(source_timer); > + switch (num_called) { > + case 0: > + pr_debug("%s: found clockevent timer\n", __func__); > + add_clockevent(timer); > + of_node_put(timer); > + break; > + case 1: > + pr_debug("%s: found clocksource timer\n", __func__); > + add_clocksource(timer); > + of_node_put(timer); > + init_sched_clock(); > + break; > + default: > + break; > + } > > - init_sched_clock(); > + num_called++; > } > +CLOCKSOURCE_OF_DECLARE(pc3x2_timer, "picochip,pc3x2-timer", dw_apb_timer_init); > +CLOCKSOURCE_OF_DECLARE(apb_timer, "snps,dw-apb-timer-osc", dw_apb_timer_init); I think maybe we also want CLOCKSOURCE_OF_DECLARE() instances for the contents of sptimer_ids for completeness, otherwise looks good. Acked-by: Jamie Iles <jamie@jamieiles.com> Thanks, Jamie
Am Dienstag, 4. Juni 2013, 16:21:20 schrieb Jamie Iles: > Hi Heiko, > > On Tue, Jun 04, 2013 at 11:38:42AM +0200, Heiko Stübner wrote: > > dw_apb_timer_init used to search the devicetree for matching timer > > devices, making calls to it from board files necessary. > > > > Change the dw_apb_timer_init to work with CLOCKSOURCE_OF_DECLARE. > > With this change the function gets called once for each timer node > > and tracks these number of calls to attach clockevent and clocksource > > devices to the nodes. > > > > Also remove the calls to dw_apb_timer_init from all previous users, as > > clocksource_of_init is the default for init_time now. > > > > Tested on the upcoming rk3066 code. > > > > Signed-off-by: Heiko Stuebner <heiko@sntech.de> > > Acked-by: Rob Herring <rob.herring@calxeda.com> > > Acked-by: Arnd Bergmann <arnd@arndb.de> > > --- > > ... > > > -void __init dw_apb_timer_init(void) > > +static int num_called; > > +static void __init dw_apb_timer_init(struct device_node *timer) > > > > { > > > > - struct device_node *event_timer, *source_timer; > > - > > - event_timer = of_find_matching_node(NULL, osctimer_ids); > > - if (!event_timer) > > - panic("No timer for clockevent"); > > - add_clockevent(event_timer); > > - > > - source_timer = of_find_matching_node(event_timer, osctimer_ids); > > - if (!source_timer) > > - panic("No timer for clocksource"); > > - add_clocksource(source_timer); > > - > > - of_node_put(source_timer); > > + switch (num_called) { > > + case 0: > > + pr_debug("%s: found clockevent timer\n", __func__); > > + add_clockevent(timer); > > + of_node_put(timer); > > + break; > > + case 1: > > + pr_debug("%s: found clocksource timer\n", __func__); > > + add_clocksource(timer); > > + of_node_put(timer); > > + init_sched_clock(); > > + break; > > + default: > > + break; > > + } > > > > - init_sched_clock(); > > + num_called++; > > > > } > > > > +CLOCKSOURCE_OF_DECLARE(pc3x2_timer, "picochip,pc3x2-timer", > > dw_apb_timer_init); +CLOCKSOURCE_OF_DECLARE(apb_timer, > > "snps,dw-apb-timer-osc", dw_apb_timer_init); > > I think maybe we also want CLOCKSOURCE_OF_DECLARE() instances for the > contents of sptimer_ids for completeness, otherwise looks good. Hmm ... difficult. As you can see, currently we call init_sched_clock when the second timer is found, which then tries to find the sptimer or uses the clocksource as sched_clock. So to use CLOCKSOURCE_OF_DECLARE for the sptimer the init_sched_clock call would need to move to its init function. So on system without sptimer (like mine) this third call would never happen, and the system would be missing a sched_clock. Or I just don't see the solution currently. In any case this could probably be handled by someone with the relevant hardware to test ;-) . > Acked-by: Jamie Iles <jamie@jamieiles.com> thanks
diff --git a/arch/arm/mach-picoxcell/common.c b/arch/arm/mach-picoxcell/common.c index 70b441a..7cde042 100644 --- a/arch/arm/mach-picoxcell/common.c +++ b/arch/arm/mach-picoxcell/common.c @@ -15,7 +15,6 @@ #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/of_platform.h> -#include <linux/dw_apb_timer.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> @@ -88,7 +87,6 @@ DT_MACHINE_START(PICOXCELL, "Picochip picoXcell") .map_io = picoxcell_map_io, .nr_irqs = NR_IRQS_LEGACY, .init_irq = irqchip_init, - .init_time = dw_apb_timer_init, .init_machine = picoxcell_init_machine, .dt_compat = picoxcell_dt_match, .restart = picoxcell_wdt_restart, diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c index 46a0513..8ea11b47 100644 --- a/arch/arm/mach-socfpga/socfpga.c +++ b/arch/arm/mach-socfpga/socfpga.c @@ -14,7 +14,6 @@ * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ -#include <linux/dw_apb_timer.h> #include <linux/clk-provider.h> #include <linux/irqchip.h> #include <linux/of_address.h> @@ -120,7 +119,6 @@ DT_MACHINE_START(SOCFPGA, "Altera SOCFPGA") .smp = smp_ops(socfpga_smp_ops), .map_io = socfpga_map_io, .init_irq = socfpga_init_irq, - .init_time = dw_apb_timer_init, .init_machine = socfpga_cyclone5_init, .restart = socfpga_cyclone5_restart, .dt_compat = altera_dt_match, diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 48a0f2e..5871933 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -22,6 +22,7 @@ config DW_APB_TIMER config DW_APB_TIMER_OF bool select DW_APB_TIMER + select CLKSRC_OF config ARMADA_370_XP_TIMER bool diff --git a/drivers/clocksource/dw_apb_timer_of.c b/drivers/clocksource/dw_apb_timer_of.c index 1964f87..cef5544 100644 --- a/drivers/clocksource/dw_apb_timer_of.c +++ b/drivers/clocksource/dw_apb_timer_of.c @@ -133,27 +133,26 @@ static void init_sched_clock(void) setup_sched_clock(read_sched_clock, 32, sched_rate); } -static const struct of_device_id osctimer_ids[] __initconst = { - { .compatible = "picochip,pc3x2-timer" }, - { .compatible = "snps,dw-apb-timer-osc" }, - {}, -}; - -void __init dw_apb_timer_init(void) +static int num_called; +static void __init dw_apb_timer_init(struct device_node *timer) { - struct device_node *event_timer, *source_timer; - - event_timer = of_find_matching_node(NULL, osctimer_ids); - if (!event_timer) - panic("No timer for clockevent"); - add_clockevent(event_timer); - - source_timer = of_find_matching_node(event_timer, osctimer_ids); - if (!source_timer) - panic("No timer for clocksource"); - add_clocksource(source_timer); - - of_node_put(source_timer); + switch (num_called) { + case 0: + pr_debug("%s: found clockevent timer\n", __func__); + add_clockevent(timer); + of_node_put(timer); + break; + case 1: + pr_debug("%s: found clocksource timer\n", __func__); + add_clocksource(timer); + of_node_put(timer); + init_sched_clock(); + break; + default: + break; + } - init_sched_clock(); + num_called++; } +CLOCKSOURCE_OF_DECLARE(pc3x2_timer, "picochip,pc3x2-timer", dw_apb_timer_init); +CLOCKSOURCE_OF_DECLARE(apb_timer, "snps,dw-apb-timer-osc", dw_apb_timer_init); diff --git a/include/linux/dw_apb_timer.h b/include/linux/dw_apb_timer.h index dd755ce..07261d5 100644 --- a/include/linux/dw_apb_timer.h +++ b/include/linux/dw_apb_timer.h @@ -53,5 +53,4 @@ void dw_apb_clocksource_start(struct dw_apb_clocksource *dw_cs); cycle_t dw_apb_clocksource_read(struct dw_apb_clocksource *dw_cs); void dw_apb_clocksource_unregister(struct dw_apb_clocksource *dw_cs); -extern void dw_apb_timer_init(void); #endif /* __DW_APB_TIMER_H__ */