mediatek: add support for the new MT7623 Arm SoC

the support is still WIP. next steps are to make the pmic and ethernet work.
this is the first commit to make sure nothing gets lost.

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 47354

1 files changed, 51 insertions, 0 deletions

diff --git a/target/linux/mediatek/patches/0040-clocksource-mediatek-Use-GPT-as-sched-clock-source.patch b/target/linux/mediatek/patches/0040-clocksource-mediatek-Use-GPT-as-sched-clock-source.patch
new file mode 100644
index 0000000000..c6b66afc05
--- /dev/null
+++ b/target/linux/mediatek/patches/0040-clocksource-mediatek-Use-GPT-as-sched-clock-source.patch
@@ -0,0 +1,51 @@
+From 3b3c2406dd9797bc806e0ce756142a33d209c4e8 Mon Sep 17 00:00:00 2001
+From: "Joe.C" <yingjoe.chen@mediatek.com>
+Date: Fri, 1 May 2015 15:43:25 +0800
+Subject: [PATCH 40/76] clocksource: mediatek: Use GPT as sched clock source
+
+When cpu is in deep idle, arch timer will stop counting. Setup GPT as
+sched clock source so it can keep counting in idle.
+
+Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
+---
+ drivers/clocksource/mtk_timer.c |   10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c
+index 85e0ab5..9a90c7b 100644
+--- a/drivers/clocksource/mtk_timer.c
++++ b/drivers/clocksource/mtk_timer.c
+@@ -24,6 +24,7 @@
+ #include <linux/of.h>
+ #include <linux/of_address.h>
+ #include <linux/of_irq.h>
++#include <linux/sched_clock.h>
+ #include <linux/slab.h>
+ 
+ #define GPT_IRQ_EN_REG		0x00
+@@ -59,6 +60,13 @@ struct mtk_clock_event_device {
+ 	struct clock_event_device dev;
+ };
+ 
++static void __iomem *gpt_base __read_mostly;
++
++static u64 notrace mtk_read_sched_clock(void)
++{
++	return readl_relaxed(gpt_base + TIMER_CNT_REG(GPT_CLK_SRC));
++}
++
+ static inline struct mtk_clock_event_device *to_mtk_clk(
+ 				struct clock_event_device *c)
+ {
+@@ -239,6 +247,8 @@ static void __init mtk_timer_init(struct device_node *node)
+ 	mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN);
+ 	clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC),
+ 			node->name, rate, 300, 32, clocksource_mmio_readl_up);
++	gpt_base = evt->gpt_base;
++	sched_clock_register(mtk_read_sched_clock, 32, rate);
+ 
+ 	/* Configure clock event */
+ 	mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT);
+-- 
+1.7.10.4
+