Hi Thomas,
On 11/03/2012 03:45 PM, Thomas Abraham wrote:
Allow the MCT controller base address and interrupts to be obtained from
device tree and remove unused static definitions of these. The non-dt support
for Exynos5250 is removed but retained for Exynos4210 based platforms.
Cc: Changhwan Youn<chaos.youn@xxxxxxxxxxx>
Signed-off-by: Thomas Abraham<thomas.abraham@xxxxxxxxxx>
---
.../bindings/timer/samsung,exynos4210-mct.txt | 70 ++++++++++++++++++++
arch/arm/mach-exynos/include/mach/irqs.h | 6 --
arch/arm/mach-exynos/mct.c | 42 ++++++++----
3 files changed, 99 insertions(+), 19 deletions(-)
create mode 100644 Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
diff --git a/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
new file mode 100644
index 0000000..c53fd93
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
@@ -0,0 +1,70 @@
+Samsung's Multi Core Timer (MCT)
+
+The Samsung's Multi Core Timer (MCT) module includes two main blocks, the
+global timer and CPU local timers. The global timer is a 64-bit free running
+up-counter and can generate 4 interrupts when the counter reaches one of the
+four preset counter values. The CPU local timers are 32-bit free running
+down-counters and generates an interrupt when the counter expires. There is
s/generates/generate ?
+one CPU local timer instantiated in MCT for every CPU in the system.
+
+Required properties:
+
+- compatible: should be "samsung,exynos4210-mct".
+- reg: base address of the mct controller and length of the address space
+ it occupies.
+- interrupts: the list of interrupts generated by the controller. The following
+ should be the order of the interrupts specified. The local timer interrupts
+ should be specified after the four global timer interrupts have been
+ specified.
+
+ 0: Global Timer Interrupt 0
+ 1: Global Timer Interrupt 1
+ 2: Global Timer Interrupt 2
+ 3: Global Timer Interrupt 3
+ 4: Local Timer Interrupt 0
+ 5: Local Timer Interrupt 1
+ 6: ..
+ 7: ..
+ i: Local Timer Interrupt n
+
+- samsung,mct-nr-local-irqs: The number of local timer interrupts supported
+ by the MCT controller.
+
+Example 1: In this example, the system uses only the first global timer
+ interrupt generated by MCT and the remaining three global timer
+ interrupts are unused. Two local timer interrupts have been
+ specified.
+
+ mct@10050000 {
+ compatible = "samsung,exynos4210-mct";
+ reg =<0x10050000 0x800>;
+ interrupts =<0 57 0>,<0 0 0>,<0 0 0>,<0 0 0>,
+ <0 42 0>,<0 48 0>;
+ samsung,mct-nr-local-irqs =<4>;
Then this means the MCT supports 4 local interrupts but only 2 are
specified here ? Doesn't the code below expect
samsung,mct-nr-local-irqs = <2>;
in this case ? Or should interrupts really be
interrupts =<0 57 0>, <0 0 0>, <0 0 0>, <0 0 0>,
<0 42 0>, <0 48 0>, <0 0 0>, <0 0 0>;
?
+ };
+
+Example 2: In this example, the MCT global and local timer interrupts are
+ connected to two seperate interrupt controllers. Hence, an
+ interrupt-map is created to map the interrupts to the respective
+ interrupt controllers.
+
+ mct@101C0000 {
+ compatible = "samsung,exynos4210-mct";
+ reg =<0x101C0000 0x800>;
+ interrupt-controller;
+ #interrups-cells =<2>;
+ interrupt-parent =<&mct_map>;
+ interrupts =<0 0>,<1 0>,<2 0>,<3 0>,
+ <4 0>,<5 0>;
+ samsung,mct-nr-local-irqs =<2>;
Here the samsung,mct-nr-local-irqs' value matches what's specified in
the interrupts property.
+
+ mct_map: mct-map {
+ compatible = "samsung,mct-map";
Do we need a compatible property in sub-nodes like this one ?
Wouldn't it be sufficient to reference this node, for example by name ?
+ #interrupt-cells =<2>;
+ #address-cells =<0>;
+ #size-cells =<0>;
+ interrupt-map =<0x0 0&combiner 23 3>,
+ <0x4 0&gic 0 120 0>,
+ <0x5 0&gic 0 121 0>;
+ };
+ };
diff --git a/arch/arm/mach-exynos/include/mach/irqs.h b/arch/arm/mach-exynos/include/mach/irqs.h
index 6da3115..03c9f04 100644
--- a/arch/arm/mach-exynos/include/mach/irqs.h
+++ b/arch/arm/mach-exynos/include/mach/irqs.h
@@ -30,8 +30,6 @@
/* For EXYNOS4 and EXYNOS5 */
-#define EXYNOS_IRQ_MCT_LOCALTIMER IRQ_PPI(12)
-
#define EXYNOS_IRQ_EINT16_31 IRQ_SPI(32)
/* For EXYNOS4 SoCs */
@@ -320,8 +318,6 @@
#define EXYNOS5_IRQ_CEC IRQ_SPI(114)
#define EXYNOS5_IRQ_SATA IRQ_SPI(115)
-#define EXYNOS5_IRQ_MCT_L0 IRQ_SPI(120)
-#define EXYNOS5_IRQ_MCT_L1 IRQ_SPI(121)
#define EXYNOS5_IRQ_MMC44 IRQ_SPI(123)
#define EXYNOS5_IRQ_MDMA1 IRQ_SPI(124)
#define EXYNOS5_IRQ_FIMC_LITE0 IRQ_SPI(125)
@@ -411,8 +407,6 @@
#define EXYNOS5_IRQ_PMU_CPU1 COMBINER_IRQ(22, 4)
#define EXYNOS5_IRQ_EINT0 COMBINER_IRQ(23, 0)
-#define EXYNOS5_IRQ_MCT_G0 COMBINER_IRQ(23, 3)
-#define EXYNOS5_IRQ_MCT_G1 COMBINER_IRQ(23, 4)
#define EXYNOS5_IRQ_EINT1 COMBINER_IRQ(24, 0)
#define EXYNOS5_IRQ_SYSMMU_LITE1_0 COMBINER_IRQ(24, 1)
diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c
index d65d0c7..f7792b8 100644
--- a/arch/arm/mach-exynos/mct.c
+++ b/arch/arm/mach-exynos/mct.c
@@ -19,6 +19,9 @@
#include<linux/platform_device.h>
#include<linux/delay.h>
#include<linux/percpu.h>
+#include<linux/of.h>
+#include<linux/of_irq.h>
+#include<linux/of_address.h>
#include<asm/hardware/gic.h>
#include<asm/localtimer.h>
@@ -483,14 +486,16 @@ static struct local_timer_ops exynos4_mct_tick_ops __cpuinitdata = {
};
#endif /* CONFIG_LOCAL_TIMERS */
-static void __init exynos4_timer_resources(void)
+static void __init exynos4_timer_resources(struct device_node *np)
{
struct clk *mct_clk;
mct_clk = clk_get(NULL, "xtal");
clk_rate = clk_get_rate(mct_clk);
- reg_base = S5P_VA_SYSTIMER;
+ reg_base = (np) ? of_iomap(np, 0) : S5P_VA_SYSTIMER;
nit: Parentheses around np look redundant.
+ if (!reg_base)
+ panic("%s: unable to ioremap mct address space\n", __func__);
How about adding a line like:
#define pr_fmt(fmt) "%s: " fmt, __func__
on top of this file and dropping "%s: " and __func__ in those panic()
calls ? It would make the logs more consistent across whole file.
#ifdef CONFIG_LOCAL_TIMERS
if (mct_int_type == MCT_INT_PPI) {
@@ -509,23 +514,34 @@ static void __init exynos4_timer_resources(void)
static void __init exynos4_timer_init(void)
{
- if (soc_is_exynos4210()) {
+ struct device_node *np;
+ u32 nr_irqs, i;
+
+ np = of_find_compatible_node(NULL, NULL, "samsung,exynos4210-mct");
+ if (np) {
+ if (of_machine_is_compatible("samsung,exynos4210") ||
+ of_machine_is_compatible("samsung,exynos5250"))
+ mct_int_type = MCT_INT_SPI;
+ else
+ mct_int_type = MCT_INT_PPI;
Does it make sense to specify this mct_int_type as a property of
the mct node ?
+
+ if (of_property_read_u32(np, "samsung,mct-nr-local-irqs",
+ &nr_irqs))
+ panic("%s: number of local irqs not specified\n",
+ __func__);
+
+ mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
+ for (i = 0; i< nr_irqs; i++)
+ mct_irqs[MCT_L0_IRQ + i] =
+ irq_of_parse_and_map(np, MCT_L0_IRQ + i);
+ } else if (soc_is_exynos4210()) {
mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0;
mct_irqs[MCT_L0_IRQ] = EXYNOS4_IRQ_MCT_L0;
mct_irqs[MCT_L1_IRQ] = EXYNOS4_IRQ_MCT_L1;
mct_int_type = MCT_INT_SPI;
- } else if (soc_is_exynos5250()) {
- mct_irqs[MCT_G0_IRQ] = EXYNOS5_IRQ_MCT_G0;
- mct_irqs[MCT_L0_IRQ] = EXYNOS5_IRQ_MCT_L0;
- mct_irqs[MCT_L1_IRQ] = EXYNOS5_IRQ_MCT_L1;
- mct_int_type = MCT_INT_SPI;
- } else {
- mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0;
- mct_irqs[MCT_L0_IRQ] = EXYNOS_IRQ_MCT_LOCALTIMER;
- mct_int_type = MCT_INT_PPI;
}
- exynos4_timer_resources();
+ exynos4_timer_resources(np);
exynos4_clocksource_init();
exynos4_clockevent_init();
}
--
Regards,
Sylwester
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