[OpenWrt-Devel] [PATCH v2] ramips: use gic timer as clocksource for mt7621

[Nikolay Martynov]

* Switches clocksource to gic timer.
* Moves frequency definitions to dtsi since frequency was hardcoded anyway
  Will work on proper frequency detection later.

Signed-off-by: Nikolay Martynov <mar.kolya at gmail.com>
---
v2: Fix spi driver clock
---
 target/linux/ramips/dts/mt7621.dtsi                | 26 +++++++
 target/linux/ramips/mt7621/config-4.3              |  4 +
 .../patches-4.3/0902-mt7621-use-gic-timer.patch    | 85 ++++++++++++++++++++++
 3 files changed, 115 insertions(+)
 create mode 100644 target/linux/ramips/patches-4.3/0902-mt7621-use-gic-timer.patch

diff --git a/target/linux/ramips/dts/mt7621.dtsi b/target/linux/ramips/dts/mt7621.dtsi
index a06aee7..9c6f45b 100644
--- a/target/linux/ramips/dts/mt7621.dtsi
+++ b/target/linux/ramips/dts/mt7621.dtsi
@@ -22,6 +22,22 @@
 		compatible = "mti,cpu-interrupt-controller";
 	};
 
+	cpuclock: cpuclock at 0 {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+
+		/* FIXME: there should be way to detect this */
+		clock-frequency = <880000000>;
+	};
+
+	sysclock: sysclock at 0 {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+
+		/* FIXME: there should be way to detect this */
+		clock-frequency = <50000000>;
+	};
+
 	palmbus at 1E000000 {
 		compatible = "palmbus";
 		reg = <0x1E000000 0x100000>;
@@ -88,6 +104,8 @@
 			compatible = "ns16550a";
 			reg = <0xc00 0x100>;
 
+			clocks = <&sysclock>;
+
 			interrupt-parent = <&gic>;
 			interrupts = <GIC_SHARED 26 IRQ_TYPE_LEVEL_HIGH>;
 
@@ -102,6 +120,8 @@
 			compatible = "ralink,mt7621-spi";
 			reg = <0xb00 0x100>;
 
+			clocks = <&sysclock>;
+
 			resets = <&rstctrl 18>;
 			reset-names = "spi";
 
@@ -243,6 +263,12 @@
 		#interrupt-cells = <3>;
 
 		mti,reserved-cpu-vectors = <7>;
+
+		timer {
+			compatible = "mti,gic-timer";
+			interrupts = <GIC_LOCAL 1 IRQ_TYPE_NONE>;
+			clocks = <&cpuclock>;
+		};
 	};
 
 	nand at 1e003000 {
diff --git a/target/linux/ramips/mt7621/config-4.3 b/target/linux/ramips/mt7621/config-4.3
index f25850a..a56395c 100644
--- a/target/linux/ramips/mt7621/config-4.3
+++ b/target/linux/ramips/mt7621/config-4.3
@@ -17,10 +17,13 @@ CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_CEVT_R4K=y
 # CONFIG_CEVT_SYSTICK_QUIRK is not set
 CONFIG_CLKDEV_LOOKUP=y
+CONFIG_CLKSRC_MIPS_GIC=y
+CONFIG_CLKSRC_OF=y
 CONFIG_CLONE_BACKWARDS=y
 CONFIG_CMDLINE="rootfstype=squashfs,jffs2"
 CONFIG_CMDLINE_BOOL=y
 # CONFIG_CMDLINE_OVERRIDE is not set
+CONFIG_COMMON_CLK=y
 CONFIG_CPU_GENERIC_DUMP_TLB=y
 CONFIG_CPU_HAS_PREFETCH=y
 CONFIG_CPU_HAS_SYNC=y
@@ -78,6 +81,7 @@ CONFIG_HAVE_ARCH_TRACEHOOK=y
 CONFIG_HAVE_BPF_JIT=y
 CONFIG_HAVE_CC_STACKPROTECTOR=y
 CONFIG_HAVE_CLK=y
+CONFIG_HAVE_CLK_PREPARE=y
 CONFIG_HAVE_CONTEXT_TRACKING=y
 CONFIG_HAVE_C_RECORDMCOUNT=y
 CONFIG_HAVE_DEBUG_KMEMLEAK=y
diff --git a/target/linux/ramips/patches-4.3/0902-mt7621-use-gic-timer.patch b/target/linux/ramips/patches-4.3/0902-mt7621-use-gic-timer.patch
new file mode 100644
index 0000000..f7080c8
--- /dev/null
+++ b/target/linux/ramips/patches-4.3/0902-mt7621-use-gic-timer.patch
@@ -0,0 +1,85 @@
+--- a/arch/mips/ralink/Kconfig
++++ b/arch/mips/ralink/Kconfig
+@@ -52,6 +52,8 @@ choice
+ 		select SYS_SUPPORTS_SMP
+ 		select SYS_SUPPORTS_MIPS_CPS
+ 		select MIPS_GIC
++		select COMMON_CLK
++		select CLKSRC_MIPS_GIC
+ 		select HW_HAS_PCI
+ endchoice
+ 
+--- a/arch/mips/ralink/Makefile
++++ b/arch/mips/ralink/Makefile
+@@ -6,14 +6,18 @@
+ # Copyright (C) 2009-2011 Gabor Juhos <juhosg at openwrt.org>
+ # Copyright (C) 2013 John Crispin <blogic at openwrt.org>
+ 
+-obj-y := prom.o of.o reset.o clk.o timer.o
++obj-y := prom.o of.o reset.o
++
++ifndef CONFIG_MIPS_GIC
++	obj-y += clk.o timer.o
++endif
+ 
+ obj-$(CONFIG_CLKEVT_RT3352) += cevt-rt3352.o
+ 
+ obj-$(CONFIG_RALINK_ILL_ACC) += ill_acc.o
+ 
+ obj-$(CONFIG_IRQ_INTC) += irq.o
+-obj-$(CONFIG_MIPS_GIC) += irq-gic.o
++obj-$(CONFIG_MIPS_GIC) += irq-gic.o timer-gic.o
+ 
+ obj-$(CONFIG_SOC_RT288X) += rt288x.o
+ obj-$(CONFIG_SOC_RT305X) += rt305x.o
+--- a/arch/mips/ralink/irq-gic.c
++++ b/arch/mips/ralink/irq-gic.c
+@@ -3,13 +3,6 @@
+ #include <linux/of.h>
+ #include <linux/irqchip.h>
+ 
+-#include <linux/irqchip/mips-gic.h>
+-
+-unsigned int get_c0_compare_int(void)
+-{
+-	return gic_get_c0_compare_int();
+-}
+-
+ void __init
+ arch_init_irq(void)
+ {
+--- /dev/null
++++ b/arch/mips/ralink/timer-gic.c
+@@ -0,0 +1,15 @@
++#include <linux/init.h>
++
++#include <linux/of.h>
++#include <linux/clk-provider.h>
++#include <linux/clocksource.h>
++
++#include "common.h"
++
++void __init plat_time_init(void)
++{
++	ralink_of_remap();
++
++	of_clk_init(NULL);
++	clocksource_of_init();
++}
+--- a/arch/mips/ralink/mt7621.c
++++ b/arch/mips/ralink/mt7621.c
+@@ -152,11 +152,14 @@ void __init ralink_clk_init(void)
+ 		}
+ 		break;
+ 	}
++	/*
++	  FIXME: detect frequency automatically
+ 	cpu_clk = 880000000;
+ 	ralink_clk_add("cpu", cpu_clk);
+ 	ralink_clk_add("1e000b00.spi", 50000000);
+ 	ralink_clk_add("1e000c00.uartlite", 50000000);
+ 	ralink_clk_add("1e000d00.uart", 50000000);
++	*/
+ }
+ 
+ void __init ralink_of_remap(void)
-- 
2.6.4
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