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authorMaxime Ripard <maxime.ripard@free-electrons.com>2014-07-01 11:33:18 +0200
committerNicolas Ferre <nicolas.ferre@atmel.com>2014-09-03 10:55:22 +0200
commitf807a89cfe3e7379ec501810d67a5888edbb94f1 (patch)
tree43882348a1236b368ab46c5c15929087757ebdc9
parenta7d84d73b9ca32871da8fc05e95ca47c04fbb110 (diff)
ARM: at91: PIT: Rework probe functions
The PIT timer driver until now had a single probe function, disregarding wether it was probed through DT or in the old-style way. This code later on was calling some DT function to retrieve the proper values for its base address, interrupts and clocks. While this was working, it was preventing the usage of CLOCKSOURCE_OF_DECLARE, and the two different probe path were not as clearly separated as they could be. Rework the probe path to take this into account, and switch to CLOCKSOURCE_OF_DECLARE. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Boris BREZILLON <boris.brezillon@free-electrons.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
-rw-r--r--arch/arm/mach-at91/Kconfig1
-rw-r--r--arch/arm/mach-at91/at91sam926x_time.c108
-rw-r--r--arch/arm/mach-at91/board-dt-sam9.c3
-rw-r--r--arch/arm/mach-at91/board-dt-sama5.c3
4 files changed, 51 insertions, 64 deletions
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 6eb3c658761d..c3f9ebc5f9f5 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -34,6 +34,7 @@ config OLD_IRQ_AT91
select SPARSE_IRQ
config AT91_SAM9_TIME
+ select CLKSRC_OF if OF
bool
config HAVE_AT91_SMD
diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
index b87a12f05540..af466eb68624 100644
--- a/arch/arm/mach-at91/at91sam926x_time.c
+++ b/arch/arm/mach-at91/at91sam926x_time.c
@@ -19,7 +19,6 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
-#include <asm/mach/time.h>
#include <mach/hardware.h>
#define AT91_PIT_MR 0x00 /* Mode Register */
@@ -176,81 +175,21 @@ static struct irqaction at91sam926x_pit_irq = {
.name = "at91_tick",
.flags = IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
.handler = at91sam926x_pit_interrupt,
- .irq = NR_IRQS_LEGACY + AT91_ID_SYS,
};
-#ifdef CONFIG_OF
-static struct of_device_id pit_timer_ids[] = {
- { .compatible = "atmel,at91sam9260-pit" },
- { /* sentinel */ }
-};
-
-static int __init of_at91sam926x_pit_init(void)
-{
- struct device_node *np;
- int ret;
-
- np = of_find_matching_node(NULL, pit_timer_ids);
- if (!np)
- goto err;
-
- pit_base_addr = of_iomap(np, 0);
- if (!pit_base_addr)
- goto node_err;
-
- mck = of_clk_get(np, 0);
-
- /* Get the interrupts property */
- ret = irq_of_parse_and_map(np, 0);
- if (!ret) {
- pr_crit("AT91: PIT: Unable to get IRQ from DT\n");
- if (!IS_ERR(mck))
- clk_put(mck);
- goto ioremap_err;
- }
- at91sam926x_pit_irq.irq = ret;
-
- of_node_put(np);
-
- return 0;
-
-ioremap_err:
- iounmap(pit_base_addr);
-node_err:
- of_node_put(np);
-err:
- return -EINVAL;
-}
-#else
-static int __init of_at91sam926x_pit_init(void)
-{
- return -EINVAL;
-}
-#endif
-
/*
* Set up both clocksource and clockevent support.
*/
-void __init at91sam926x_pit_init(void)
+static void __init at91sam926x_pit_common_init(void)
{
unsigned long pit_rate;
unsigned bits;
int ret;
- mck = ERR_PTR(-ENOENT);
-
- /* For device tree enabled device: initialize here */
- of_at91sam926x_pit_init();
-
/*
* Use our actual MCK to figure out how many MCK/16 ticks per
* 1/HZ period (instead of a compile-time constant LATCH).
*/
- if (IS_ERR(mck))
- mck = clk_get(NULL, "mck");
-
- if (IS_ERR(mck))
- panic("AT91: PIT: Unable to get mck clk\n");
pit_rate = clk_get_rate(mck) / 16;
pit_cycle = DIV_ROUND_CLOSEST(pit_rate, HZ);
WARN_ON(((pit_cycle - 1) & ~AT91_PIT_PIV) != 0);
@@ -277,6 +216,51 @@ void __init at91sam926x_pit_init(void)
clockevents_register_device(&pit_clkevt);
}
+static void __init at91sam926x_pit_dt_init(struct device_node *node)
+{
+ unsigned int irq;
+
+ pit_base_addr = of_iomap(node, 0);
+ if (!pit_base_addr)
+ return;
+
+ mck = of_clk_get(node, 0);
+ if (IS_ERR(mck))
+ /* Fallback on clkdev for !CCF-based boards */
+ mck = clk_get(NULL, "mck");
+
+ if (IS_ERR(mck))
+ panic("AT91: PIT: Unable to get mck clk\n");
+
+ /* Get the interrupts property */
+ irq = irq_of_parse_and_map(node, 0);
+ if (!irq) {
+ pr_crit("AT91: PIT: Unable to get IRQ from DT\n");
+ goto clk_err;
+ }
+
+ at91sam926x_pit_irq.irq = irq;
+
+ at91sam926x_pit_common_init();
+
+clk_err:
+ clk_put(mck);
+ iounmap(pit_base_addr);
+}
+CLOCKSOURCE_OF_DECLARE(at91sam926x_pit, "atmel,at91sam9260-pit",
+ at91sam926x_pit_dt_init);
+
+void __init at91sam926x_pit_init(void)
+{
+ mck = clk_get(NULL, "mck");
+ if (IS_ERR(mck))
+ panic("AT91: PIT: Unable to get mck clk\n");
+
+ at91sam926x_pit_irq.irq = NR_IRQS_LEGACY + AT91_ID_SYS;
+
+ at91sam926x_pit_common_init();
+}
+
void __init at91sam926x_ioremap_pit(u32 addr)
{
if (of_have_populated_dt())
diff --git a/arch/arm/mach-at91/board-dt-sam9.c b/arch/arm/mach-at91/board-dt-sam9.c
index dfa8d48146fe..78962fd23859 100644
--- a/arch/arm/mach-at91/board-dt-sam9.c
+++ b/arch/arm/mach-at91/board-dt-sam9.c
@@ -14,6 +14,7 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/clk-provider.h>
+#include <linux/clocksource.h>
#include <asm/setup.h>
#include <asm/irq.h>
@@ -31,7 +32,7 @@ static void __init sam9_dt_timer_init(void)
#if defined(CONFIG_COMMON_CLK)
of_clk_init(NULL);
#endif
- at91sam926x_pit_init();
+ clocksource_of_init();
}
static const char *at91_dt_board_compat[] __initdata = {
diff --git a/arch/arm/mach-at91/board-dt-sama5.c b/arch/arm/mach-at91/board-dt-sama5.c
index d6fe04bcaabd..4f01e34fae0a 100644
--- a/arch/arm/mach-at91/board-dt-sama5.c
+++ b/arch/arm/mach-at91/board-dt-sama5.c
@@ -17,6 +17,7 @@
#include <linux/of_platform.h>
#include <linux/phy.h>
#include <linux/clk-provider.h>
+#include <linux/clocksource.h>
#include <asm/setup.h>
#include <asm/irq.h>
@@ -32,7 +33,7 @@ static void __init sama5_dt_timer_init(void)
#if defined(CONFIG_COMMON_CLK)
of_clk_init(NULL);
#endif
- at91sam926x_pit_init();
+ clocksource_of_init();
}
static int ksz9021rn_phy_fixup(struct phy_device *phy)